1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/drivers/block/floppy.c 4 * 5 * Copyright (C) 1991, 1992 Linus Torvalds 6 * Copyright (C) 1993, 1994 Alain Knaff 7 * Copyright (C) 1998 Alan Cox 8 */ 9 10 /* 11 * 02.12.91 - Changed to static variables to indicate need for reset 12 * and recalibrate. This makes some things easier (output_byte reset 13 * checking etc), and means less interrupt jumping in case of errors, 14 * so the code is hopefully easier to understand. 15 */ 16 17 /* 18 * This file is certainly a mess. I've tried my best to get it working, 19 * but I don't like programming floppies, and I have only one anyway. 20 * Urgel. I should check for more errors, and do more graceful error 21 * recovery. Seems there are problems with several drives. I've tried to 22 * correct them. No promises. 23 */ 24 25 /* 26 * As with hd.c, all routines within this file can (and will) be called 27 * by interrupts, so extreme caution is needed. A hardware interrupt 28 * handler may not sleep, or a kernel panic will happen. Thus I cannot 29 * call "floppy-on" directly, but have to set a special timer interrupt 30 * etc. 31 */ 32 33 /* 34 * 28.02.92 - made track-buffering routines, based on the routines written 35 * by entropy@wintermute.wpi.edu (Lawrence Foard). Linus. 36 */ 37 38 /* 39 * Automatic floppy-detection and formatting written by Werner Almesberger 40 * (almesber@nessie.cs.id.ethz.ch), who also corrected some problems with 41 * the floppy-change signal detection. 42 */ 43 44 /* 45 * 1992/7/22 -- Hennus Bergman: Added better error reporting, fixed 46 * FDC data overrun bug, added some preliminary stuff for vertical 47 * recording support. 48 * 49 * 1992/9/17: Added DMA allocation & DMA functions. -- hhb. 50 * 51 * TODO: Errors are still not counted properly. 52 */ 53 54 /* 1992/9/20 55 * Modifications for ``Sector Shifting'' by Rob Hooft (hooft@chem.ruu.nl) 56 * modeled after the freeware MS-DOS program fdformat/88 V1.8 by 57 * Christoph H. Hochst\"atter. 58 * I have fixed the shift values to the ones I always use. Maybe a new 59 * ioctl() should be created to be able to modify them. 60 * There is a bug in the driver that makes it impossible to format a 61 * floppy as the first thing after bootup. 62 */ 63 64 /* 65 * 1993/4/29 -- Linus -- cleaned up the timer handling in the kernel, and 66 * this helped the floppy driver as well. Much cleaner, and still seems to 67 * work. 68 */ 69 70 /* 1994/6/24 --bbroad-- added the floppy table entries and made 71 * minor modifications to allow 2.88 floppies to be run. 72 */ 73 74 /* 1994/7/13 -- Paul Vojta -- modified the probing code to allow three or more 75 * disk types. 76 */ 77 78 /* 79 * 1994/8/8 -- Alain Knaff -- Switched to fdpatch driver: Support for bigger 80 * format bug fixes, but unfortunately some new bugs too... 81 */ 82 83 /* 1994/9/17 -- Koen Holtman -- added logging of physical floppy write 84 * errors to allow safe writing by specialized programs. 85 */ 86 87 /* 1995/4/24 -- Dan Fandrich -- added support for Commodore 1581 3.5" disks 88 * by defining bit 1 of the "stretch" parameter to mean put sectors on the 89 * opposite side of the disk, leaving the sector IDs alone (i.e. Commodore's 90 * drives are "upside-down"). 91 */ 92 93 /* 94 * 1995/8/26 -- Andreas Busse -- added Mips support. 95 */ 96 97 /* 98 * 1995/10/18 -- Ralf Baechle -- Portability cleanup; move machine dependent 99 * features to asm/floppy.h. 100 */ 101 102 /* 103 * 1998/1/21 -- Richard Gooch <rgooch@atnf.csiro.au> -- devfs support 104 */ 105 106 /* 107 * 1998/05/07 -- Russell King -- More portability cleanups; moved definition of 108 * interrupt and dma channel to asm/floppy.h. Cleaned up some formatting & 109 * use of '0' for NULL. 110 */ 111 112 /* 113 * 1998/06/07 -- Alan Cox -- Merged the 2.0.34 fixes for resource allocation 114 * failures. 115 */ 116 117 /* 118 * 1998/09/20 -- David Weinehall -- Added slow-down code for buggy PS/2-drives. 119 */ 120 121 /* 122 * 1999/08/13 -- Paul Slootman -- floppy stopped working on Alpha after 24 123 * days, 6 hours, 32 minutes and 32 seconds (i.e. MAXINT jiffies; ints were 124 * being used to store jiffies, which are unsigned longs). 125 */ 126 127 /* 128 * 2000/08/28 -- Arnaldo Carvalho de Melo <acme@conectiva.com.br> 129 * - get rid of check_region 130 * - s/suser/capable/ 131 */ 132 133 /* 134 * 2001/08/26 -- Paul Gortmaker - fix insmod oops on machines with no 135 * floppy controller (lingering task on list after module is gone... boom.) 136 */ 137 138 /* 139 * 2002/02/07 -- Anton Altaparmakov - Fix io ports reservation to correct range 140 * (0x3f2-0x3f5, 0x3f7). This fix is a bit of a hack but the proper fix 141 * requires many non-obvious changes in arch dependent code. 142 */ 143 144 /* 2003/07/28 -- Daniele Bellucci <bellucda@tiscali.it>. 145 * Better audit of register_blkdev. 146 */ 147 148 #define REALLY_SLOW_IO 149 150 #define DEBUGT 2 151 152 #define DPRINT(format, args...) \ 153 pr_info("floppy%d: " format, current_drive, ##args) 154 155 #define DCL_DEBUG /* debug disk change line */ 156 #ifdef DCL_DEBUG 157 #define debug_dcl(test, fmt, args...) \ 158 do { if ((test) & FD_DEBUG) DPRINT(fmt, ##args); } while (0) 159 #else 160 #define debug_dcl(test, fmt, args...) \ 161 do { if (0) DPRINT(fmt, ##args); } while (0) 162 #endif 163 164 /* do print messages for unexpected interrupts */ 165 static int print_unex = 1; 166 #include <linux/module.h> 167 #include <linux/sched.h> 168 #include <linux/fs.h> 169 #include <linux/kernel.h> 170 #include <linux/timer.h> 171 #include <linux/workqueue.h> 172 #include <linux/fdreg.h> 173 #include <linux/fd.h> 174 #include <linux/hdreg.h> 175 #include <linux/errno.h> 176 #include <linux/slab.h> 177 #include <linux/mm.h> 178 #include <linux/bio.h> 179 #include <linux/string.h> 180 #include <linux/jiffies.h> 181 #include <linux/fcntl.h> 182 #include <linux/delay.h> 183 #include <linux/mc146818rtc.h> /* CMOS defines */ 184 #include <linux/ioport.h> 185 #include <linux/interrupt.h> 186 #include <linux/init.h> 187 #include <linux/major.h> 188 #include <linux/platform_device.h> 189 #include <linux/mod_devicetable.h> 190 #include <linux/mutex.h> 191 #include <linux/io.h> 192 #include <linux/uaccess.h> 193 #include <linux/async.h> 194 #include <linux/compat.h> 195 196 /* 197 * PS/2 floppies have much slower step rates than regular floppies. 198 * It's been recommended that take about 1/4 of the default speed 199 * in some more extreme cases. 200 */ 201 static DEFINE_MUTEX(floppy_mutex); 202 static int slow_floppy; 203 204 #include <asm/dma.h> 205 #include <asm/irq.h> 206 207 static int FLOPPY_IRQ = 6; 208 static int FLOPPY_DMA = 2; 209 static int can_use_virtual_dma = 2; 210 /* ======= 211 * can use virtual DMA: 212 * 0 = use of virtual DMA disallowed by config 213 * 1 = use of virtual DMA prescribed by config 214 * 2 = no virtual DMA preference configured. By default try hard DMA, 215 * but fall back on virtual DMA when not enough memory available 216 */ 217 218 static int use_virtual_dma; 219 /* ======= 220 * use virtual DMA 221 * 0 using hard DMA 222 * 1 using virtual DMA 223 * This variable is set to virtual when a DMA mem problem arises, and 224 * reset back in floppy_grab_irq_and_dma. 225 * It is not safe to reset it in other circumstances, because the floppy 226 * driver may have several buffers in use at once, and we do currently not 227 * record each buffers capabilities 228 */ 229 230 static DEFINE_SPINLOCK(floppy_lock); 231 232 static unsigned short virtual_dma_port = 0x3f0; 233 irqreturn_t floppy_interrupt(int irq, void *dev_id); 234 static int set_dor(int fdc, char mask, char data); 235 236 #define K_64 0x10000 /* 64KB */ 237 238 /* the following is the mask of allowed drives. By default units 2 and 239 * 3 of both floppy controllers are disabled, because switching on the 240 * motor of these drives causes system hangs on some PCI computers. drive 241 * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if 242 * a drive is allowed. 243 * 244 * NOTE: This must come before we include the arch floppy header because 245 * some ports reference this variable from there. -DaveM 246 */ 247 248 static int allowed_drive_mask = 0x33; 249 250 #include <asm/floppy.h> 251 252 static int irqdma_allocated; 253 254 #include <linux/blk-mq.h> 255 #include <linux/blkpg.h> 256 #include <linux/cdrom.h> /* for the compatibility eject ioctl */ 257 #include <linux/completion.h> 258 259 static LIST_HEAD(floppy_reqs); 260 static struct request *current_req; 261 static int set_next_request(void); 262 263 #ifndef fd_get_dma_residue 264 #define fd_get_dma_residue() get_dma_residue(FLOPPY_DMA) 265 #endif 266 267 /* Dma Memory related stuff */ 268 269 #ifndef fd_dma_mem_free 270 #define fd_dma_mem_free(addr, size) free_pages(addr, get_order(size)) 271 #endif 272 273 #ifndef fd_dma_mem_alloc 274 #define fd_dma_mem_alloc(size) __get_dma_pages(GFP_KERNEL, get_order(size)) 275 #endif 276 277 #ifndef fd_cacheflush 278 #define fd_cacheflush(addr, size) /* nothing... */ 279 #endif 280 281 static inline void fallback_on_nodma_alloc(char **addr, size_t l) 282 { 283 #ifdef FLOPPY_CAN_FALLBACK_ON_NODMA 284 if (*addr) 285 return; /* we have the memory */ 286 if (can_use_virtual_dma != 2) 287 return; /* no fallback allowed */ 288 pr_info("DMA memory shortage. Temporarily falling back on virtual DMA\n"); 289 *addr = (char *)nodma_mem_alloc(l); 290 #else 291 return; 292 #endif 293 } 294 295 /* End dma memory related stuff */ 296 297 static unsigned long fake_change; 298 static bool initialized; 299 300 #define ITYPE(x) (((x) >> 2) & 0x1f) 301 #define TOMINOR(x) ((x & 3) | ((x & 4) << 5)) 302 #define UNIT(x) ((x) & 0x03) /* drive on fdc */ 303 #define FDC(x) (((x) & 0x04) >> 2) /* fdc of drive */ 304 /* reverse mapping from unit and fdc to drive */ 305 #define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2)) 306 307 #define PH_HEAD(floppy, head) (((((floppy)->stretch & 2) >> 1) ^ head) << 2) 308 #define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH) 309 310 /* read/write commands */ 311 #define COMMAND 0 312 #define DR_SELECT 1 313 #define TRACK 2 314 #define HEAD 3 315 #define SECTOR 4 316 #define SIZECODE 5 317 #define SECT_PER_TRACK 6 318 #define GAP 7 319 #define SIZECODE2 8 320 #define NR_RW 9 321 322 /* format commands */ 323 #define F_SIZECODE 2 324 #define F_SECT_PER_TRACK 3 325 #define F_GAP 4 326 #define F_FILL 5 327 #define NR_F 6 328 329 /* 330 * Maximum disk size (in kilobytes). 331 * This default is used whenever the current disk size is unknown. 332 * [Now it is rather a minimum] 333 */ 334 #define MAX_DISK_SIZE 4 /* 3984 */ 335 336 /* 337 * globals used by 'result()' 338 */ 339 static unsigned char reply_buffer[FD_RAW_REPLY_SIZE]; 340 static int inr; /* size of reply buffer, when called from interrupt */ 341 #define ST0 0 342 #define ST1 1 343 #define ST2 2 344 #define ST3 0 /* result of GETSTATUS */ 345 #define R_TRACK 3 346 #define R_HEAD 4 347 #define R_SECTOR 5 348 #define R_SIZECODE 6 349 350 #define SEL_DLY (2 * HZ / 100) 351 352 /* 353 * this struct defines the different floppy drive types. 354 */ 355 static struct { 356 struct floppy_drive_params params; 357 const char *name; /* name printed while booting */ 358 } default_drive_params[] = { 359 /* NOTE: the time values in jiffies should be in msec! 360 CMOS drive type 361 | Maximum data rate supported by drive type 362 | | Head load time, msec 363 | | | Head unload time, msec (not used) 364 | | | | Step rate interval, usec 365 | | | | | Time needed for spinup time (jiffies) 366 | | | | | | Timeout for spinning down (jiffies) 367 | | | | | | | Spindown offset (where disk stops) 368 | | | | | | | | Select delay 369 | | | | | | | | | RPS 370 | | | | | | | | | | Max number of tracks 371 | | | | | | | | | | | Interrupt timeout 372 | | | | | | | | | | | | Max nonintlv. sectors 373 | | | | | | | | | | | | | -Max Errors- flags */ 374 {{0, 500, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 80, 3*HZ, 20, {3,1,2,0,2}, 0, 375 0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" }, 376 377 {{1, 300, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 40, 3*HZ, 17, {3,1,2,0,2}, 0, 378 0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/ 379 380 {{2, 500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6, 83, 3*HZ, 17, {3,1,2,0,2}, 0, 381 0, { 2, 5, 6,23,10,20,12, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/ 382 383 {{3, 250, 16, 16, 3000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0, 384 0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/ 385 386 {{4, 500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0, 387 0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/ 388 389 {{5, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0, 390 0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/ 391 392 {{6, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0, 393 0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/ 394 /* | --autodetected formats--- | | | 395 * read_track | | Name printed when booting 396 * | Native format 397 * Frequency of disk change checks */ 398 }; 399 400 static struct floppy_drive_params drive_params[N_DRIVE]; 401 static struct floppy_drive_struct drive_state[N_DRIVE]; 402 static struct floppy_write_errors write_errors[N_DRIVE]; 403 static struct timer_list motor_off_timer[N_DRIVE]; 404 static struct blk_mq_tag_set tag_sets[N_DRIVE]; 405 static struct gendisk *opened_disk[N_DRIVE]; 406 static DEFINE_MUTEX(open_lock); 407 static struct floppy_raw_cmd *raw_cmd, default_raw_cmd; 408 409 /* 410 * This struct defines the different floppy types. 411 * 412 * Bit 0 of 'stretch' tells if the tracks need to be doubled for some 413 * types (e.g. 360kB diskette in 1.2MB drive, etc.). Bit 1 of 'stretch' 414 * tells if the disk is in Commodore 1581 format, which means side 0 sectors 415 * are located on side 1 of the disk but with a side 0 ID, and vice-versa. 416 * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the 417 * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical 418 * side 0 is on physical side 0 (but with the misnamed sector IDs). 419 * 'stretch' should probably be renamed to something more general, like 420 * 'options'. 421 * 422 * Bits 2 through 9 of 'stretch' tell the number of the first sector. 423 * The LSB (bit 2) is flipped. For most disks, the first sector 424 * is 1 (represented by 0x00<<2). For some CP/M and music sampler 425 * disks (such as Ensoniq EPS 16plus) it is 0 (represented as 0x01<<2). 426 * For Amstrad CPC disks it is 0xC1 (represented as 0xC0<<2). 427 * 428 * Other parameters should be self-explanatory (see also setfdprm(8)). 429 */ 430 /* 431 Size 432 | Sectors per track 433 | | Head 434 | | | Tracks 435 | | | | Stretch 436 | | | | | Gap 1 size 437 | | | | | | Data rate, | 0x40 for perp 438 | | | | | | | Spec1 (stepping rate, head unload 439 | | | | | | | | /fmt gap (gap2) */ 440 static struct floppy_struct floppy_type[32] = { 441 { 0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL }, /* 0 no testing */ 442 { 720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360" }, /* 1 360KB PC */ 443 { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /* 2 1.2MB AT */ 444 { 720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360" }, /* 3 360KB SS 3.5" */ 445 { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720" }, /* 4 720KB 3.5" */ 446 { 720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360" }, /* 5 360KB AT */ 447 { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720" }, /* 6 720KB AT */ 448 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /* 7 1.44MB 3.5" */ 449 { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /* 8 2.88MB 3.5" */ 450 { 6240,39,2,80,0,0x1B,0x43,0xAF,0x28,"E3120" }, /* 9 3.12MB 3.5" */ 451 452 { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25" */ 453 { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5" */ 454 { 820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410" }, /* 12 410KB 5.25" */ 455 { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820" }, /* 13 820KB 3.5" */ 456 { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25" */ 457 { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5" */ 458 { 840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420" }, /* 16 420KB 5.25" */ 459 { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830" }, /* 17 830KB 3.5" */ 460 { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25" */ 461 { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5" */ 462 463 { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880" }, /* 20 880KB 5.25" */ 464 { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5" */ 465 { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5" */ 466 { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25" */ 467 { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5" */ 468 { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5" */ 469 { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5" */ 470 { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5" */ 471 { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5" */ 472 { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5" */ 473 474 { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800" }, /* 30 800KB 3.5" */ 475 { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5" */ 476 }; 477 478 static struct gendisk *disks[N_DRIVE][ARRAY_SIZE(floppy_type)]; 479 480 #define SECTSIZE (_FD_SECTSIZE(*floppy)) 481 482 /* Auto-detection: Disk type used until the next media change occurs. */ 483 static struct floppy_struct *current_type[N_DRIVE]; 484 485 /* 486 * User-provided type information. current_type points to 487 * the respective entry of this array. 488 */ 489 static struct floppy_struct user_params[N_DRIVE]; 490 491 static sector_t floppy_sizes[256]; 492 493 static char floppy_device_name[] = "floppy"; 494 495 /* 496 * The driver is trying to determine the correct media format 497 * while probing is set. rw_interrupt() clears it after a 498 * successful access. 499 */ 500 static int probing; 501 502 /* Synchronization of FDC access. */ 503 #define FD_COMMAND_NONE -1 504 #define FD_COMMAND_ERROR 2 505 #define FD_COMMAND_OKAY 3 506 507 static volatile int command_status = FD_COMMAND_NONE; 508 static unsigned long fdc_busy; 509 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait); 510 static DECLARE_WAIT_QUEUE_HEAD(command_done); 511 512 /* errors encountered on the current (or last) request */ 513 static int floppy_errors; 514 515 /* Format request descriptor. */ 516 static struct format_descr format_req; 517 518 /* 519 * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps 520 * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc), 521 * H is head unload time (1=16ms, 2=32ms, etc) 522 */ 523 524 /* 525 * Track buffer 526 * Because these are written to by the DMA controller, they must 527 * not contain a 64k byte boundary crossing, or data will be 528 * corrupted/lost. 529 */ 530 static char *floppy_track_buffer; 531 static int max_buffer_sectors; 532 533 typedef void (*done_f)(int); 534 static const struct cont_t { 535 void (*interrupt)(void); 536 /* this is called after the interrupt of the 537 * main command */ 538 void (*redo)(void); /* this is called to retry the operation */ 539 void (*error)(void); /* this is called to tally an error */ 540 done_f done; /* this is called to say if the operation has 541 * succeeded/failed */ 542 } *cont; 543 544 static void floppy_ready(void); 545 static void floppy_start(void); 546 static void process_fd_request(void); 547 static void recalibrate_floppy(void); 548 static void floppy_shutdown(struct work_struct *); 549 550 static int floppy_request_regions(int); 551 static void floppy_release_regions(int); 552 static int floppy_grab_irq_and_dma(void); 553 static void floppy_release_irq_and_dma(void); 554 555 /* 556 * The "reset" variable should be tested whenever an interrupt is scheduled, 557 * after the commands have been sent. This is to ensure that the driver doesn't 558 * get wedged when the interrupt doesn't come because of a failed command. 559 * reset doesn't need to be tested before sending commands, because 560 * output_byte is automatically disabled when reset is set. 561 */ 562 static void reset_fdc(void); 563 static int floppy_revalidate(struct gendisk *disk); 564 565 /* 566 * These are global variables, as that's the easiest way to give 567 * information to interrupts. They are the data used for the current 568 * request. 569 */ 570 #define NO_TRACK -1 571 #define NEED_1_RECAL -2 572 #define NEED_2_RECAL -3 573 574 static atomic_t usage_count = ATOMIC_INIT(0); 575 576 /* buffer related variables */ 577 static int buffer_track = -1; 578 static int buffer_drive = -1; 579 static int buffer_min = -1; 580 static int buffer_max = -1; 581 582 /* fdc related variables, should end up in a struct */ 583 static struct floppy_fdc_state fdc_state[N_FDC]; 584 static int current_fdc; /* current fdc */ 585 586 static struct workqueue_struct *floppy_wq; 587 588 static struct floppy_struct *_floppy = floppy_type; 589 static unsigned char current_drive; 590 static long current_count_sectors; 591 static unsigned char fsector_t; /* sector in track */ 592 static unsigned char in_sector_offset; /* offset within physical sector, 593 * expressed in units of 512 bytes */ 594 595 static inline unsigned char fdc_inb(int fdc, int reg) 596 { 597 return fd_inb(fdc_state[fdc].address, reg); 598 } 599 600 static inline void fdc_outb(unsigned char value, int fdc, int reg) 601 { 602 fd_outb(value, fdc_state[fdc].address, reg); 603 } 604 605 static inline bool drive_no_geom(int drive) 606 { 607 return !current_type[drive] && !ITYPE(drive_state[drive].fd_device); 608 } 609 610 #ifndef fd_eject 611 static inline int fd_eject(int drive) 612 { 613 return -EINVAL; 614 } 615 #endif 616 617 /* 618 * Debugging 619 * ========= 620 */ 621 #ifdef DEBUGT 622 static long unsigned debugtimer; 623 624 static inline void set_debugt(void) 625 { 626 debugtimer = jiffies; 627 } 628 629 static inline void debugt(const char *func, const char *msg) 630 { 631 if (drive_params[current_drive].flags & DEBUGT) 632 pr_info("%s:%s dtime=%lu\n", func, msg, jiffies - debugtimer); 633 } 634 #else 635 static inline void set_debugt(void) { } 636 static inline void debugt(const char *func, const char *msg) { } 637 #endif /* DEBUGT */ 638 639 640 static DECLARE_DELAYED_WORK(fd_timeout, floppy_shutdown); 641 static const char *timeout_message; 642 643 static void is_alive(const char *func, const char *message) 644 { 645 /* this routine checks whether the floppy driver is "alive" */ 646 if (test_bit(0, &fdc_busy) && command_status < 2 && 647 !delayed_work_pending(&fd_timeout)) { 648 DPRINT("%s: timeout handler died. %s\n", func, message); 649 } 650 } 651 652 static void (*do_floppy)(void) = NULL; 653 654 #define OLOGSIZE 20 655 656 static void (*lasthandler)(void); 657 static unsigned long interruptjiffies; 658 static unsigned long resultjiffies; 659 static int resultsize; 660 static unsigned long lastredo; 661 662 static struct output_log { 663 unsigned char data; 664 unsigned char status; 665 unsigned long jiffies; 666 } output_log[OLOGSIZE]; 667 668 static int output_log_pos; 669 670 #define MAXTIMEOUT -2 671 672 static void __reschedule_timeout(int drive, const char *message) 673 { 674 unsigned long delay; 675 676 if (drive < 0 || drive >= N_DRIVE) { 677 delay = 20UL * HZ; 678 drive = 0; 679 } else 680 delay = drive_params[drive].timeout; 681 682 mod_delayed_work(floppy_wq, &fd_timeout, delay); 683 if (drive_params[drive].flags & FD_DEBUG) 684 DPRINT("reschedule timeout %s\n", message); 685 timeout_message = message; 686 } 687 688 static void reschedule_timeout(int drive, const char *message) 689 { 690 unsigned long flags; 691 692 spin_lock_irqsave(&floppy_lock, flags); 693 __reschedule_timeout(drive, message); 694 spin_unlock_irqrestore(&floppy_lock, flags); 695 } 696 697 #define INFBOUND(a, b) (a) = max_t(int, a, b) 698 #define SUPBOUND(a, b) (a) = min_t(int, a, b) 699 700 /* 701 * Bottom half floppy driver. 702 * ========================== 703 * 704 * This part of the file contains the code talking directly to the hardware, 705 * and also the main service loop (seek-configure-spinup-command) 706 */ 707 708 /* 709 * disk change. 710 * This routine is responsible for maintaining the FD_DISK_CHANGE flag, 711 * and the last_checked date. 712 * 713 * last_checked is the date of the last check which showed 'no disk change' 714 * FD_DISK_CHANGE is set under two conditions: 715 * 1. The floppy has been changed after some i/o to that floppy already 716 * took place. 717 * 2. No floppy disk is in the drive. This is done in order to ensure that 718 * requests are quickly flushed in case there is no disk in the drive. It 719 * follows that FD_DISK_CHANGE can only be cleared if there is a disk in 720 * the drive. 721 * 722 * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet. 723 * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on 724 * each seek. If a disk is present, the disk change line should also be 725 * cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk 726 * change line is set, this means either that no disk is in the drive, or 727 * that it has been removed since the last seek. 728 * 729 * This means that we really have a third possibility too: 730 * The floppy has been changed after the last seek. 731 */ 732 733 static int disk_change(int drive) 734 { 735 int fdc = FDC(drive); 736 737 if (time_before(jiffies, drive_state[drive].select_date + drive_params[drive].select_delay)) 738 DPRINT("WARNING disk change called early\n"); 739 if (!(fdc_state[fdc].dor & (0x10 << UNIT(drive))) || 740 (fdc_state[fdc].dor & 3) != UNIT(drive) || fdc != FDC(drive)) { 741 DPRINT("probing disk change on unselected drive\n"); 742 DPRINT("drive=%d fdc=%d dor=%x\n", drive, FDC(drive), 743 (unsigned int)fdc_state[fdc].dor); 744 } 745 746 debug_dcl(drive_params[drive].flags, 747 "checking disk change line for drive %d\n", drive); 748 debug_dcl(drive_params[drive].flags, "jiffies=%lu\n", jiffies); 749 debug_dcl(drive_params[drive].flags, "disk change line=%x\n", 750 fdc_inb(fdc, FD_DIR) & 0x80); 751 debug_dcl(drive_params[drive].flags, "flags=%lx\n", 752 drive_state[drive].flags); 753 754 if (drive_params[drive].flags & FD_BROKEN_DCL) 755 return test_bit(FD_DISK_CHANGED_BIT, 756 &drive_state[drive].flags); 757 if ((fdc_inb(fdc, FD_DIR) ^ drive_params[drive].flags) & 0x80) { 758 set_bit(FD_VERIFY_BIT, &drive_state[drive].flags); 759 /* verify write protection */ 760 761 if (drive_state[drive].maxblock) /* mark it changed */ 762 set_bit(FD_DISK_CHANGED_BIT, 763 &drive_state[drive].flags); 764 765 /* invalidate its geometry */ 766 if (drive_state[drive].keep_data >= 0) { 767 if ((drive_params[drive].flags & FTD_MSG) && 768 current_type[drive] != NULL) 769 DPRINT("Disk type is undefined after disk change\n"); 770 current_type[drive] = NULL; 771 floppy_sizes[TOMINOR(drive)] = MAX_DISK_SIZE << 1; 772 } 773 774 return 1; 775 } else { 776 drive_state[drive].last_checked = jiffies; 777 clear_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[drive].flags); 778 } 779 return 0; 780 } 781 782 static inline int is_selected(int dor, int unit) 783 { 784 return ((dor & (0x10 << unit)) && (dor & 3) == unit); 785 } 786 787 static bool is_ready_state(int status) 788 { 789 int state = status & (STATUS_READY | STATUS_DIR | STATUS_DMA); 790 return state == STATUS_READY; 791 } 792 793 static int set_dor(int fdc, char mask, char data) 794 { 795 unsigned char unit; 796 unsigned char drive; 797 unsigned char newdor; 798 unsigned char olddor; 799 800 if (fdc_state[fdc].address == -1) 801 return -1; 802 803 olddor = fdc_state[fdc].dor; 804 newdor = (olddor & mask) | data; 805 if (newdor != olddor) { 806 unit = olddor & 0x3; 807 if (is_selected(olddor, unit) && !is_selected(newdor, unit)) { 808 drive = REVDRIVE(fdc, unit); 809 debug_dcl(drive_params[drive].flags, 810 "calling disk change from set_dor\n"); 811 disk_change(drive); 812 } 813 fdc_state[fdc].dor = newdor; 814 fdc_outb(newdor, fdc, FD_DOR); 815 816 unit = newdor & 0x3; 817 if (!is_selected(olddor, unit) && is_selected(newdor, unit)) { 818 drive = REVDRIVE(fdc, unit); 819 drive_state[drive].select_date = jiffies; 820 } 821 } 822 return olddor; 823 } 824 825 static void twaddle(int fdc, int drive) 826 { 827 if (drive_params[drive].select_delay) 828 return; 829 fdc_outb(fdc_state[fdc].dor & ~(0x10 << UNIT(drive)), 830 fdc, FD_DOR); 831 fdc_outb(fdc_state[fdc].dor, fdc, FD_DOR); 832 drive_state[drive].select_date = jiffies; 833 } 834 835 /* 836 * Reset all driver information about the specified fdc. 837 * This is needed after a reset, and after a raw command. 838 */ 839 static void reset_fdc_info(int fdc, int mode) 840 { 841 int drive; 842 843 fdc_state[fdc].spec1 = fdc_state[fdc].spec2 = -1; 844 fdc_state[fdc].need_configure = 1; 845 fdc_state[fdc].perp_mode = 1; 846 fdc_state[fdc].rawcmd = 0; 847 for (drive = 0; drive < N_DRIVE; drive++) 848 if (FDC(drive) == fdc && 849 (mode || drive_state[drive].track != NEED_1_RECAL)) 850 drive_state[drive].track = NEED_2_RECAL; 851 } 852 853 /* 854 * selects the fdc and drive, and enables the fdc's input/dma. 855 * Both current_drive and current_fdc are changed to match the new drive. 856 */ 857 static void set_fdc(int drive) 858 { 859 unsigned int fdc; 860 861 if (drive < 0 || drive >= N_DRIVE) { 862 pr_info("bad drive value %d\n", drive); 863 return; 864 } 865 866 fdc = FDC(drive); 867 if (fdc >= N_FDC) { 868 pr_info("bad fdc value\n"); 869 return; 870 } 871 872 set_dor(fdc, ~0, 8); 873 #if N_FDC > 1 874 set_dor(1 - fdc, ~8, 0); 875 #endif 876 if (fdc_state[fdc].rawcmd == 2) 877 reset_fdc_info(fdc, 1); 878 if (fdc_inb(fdc, FD_STATUS) != STATUS_READY) 879 fdc_state[fdc].reset = 1; 880 881 current_drive = drive; 882 current_fdc = fdc; 883 } 884 885 /* 886 * locks the driver. 887 * Both current_drive and current_fdc are changed to match the new drive. 888 */ 889 static int lock_fdc(int drive) 890 { 891 if (WARN(atomic_read(&usage_count) == 0, 892 "Trying to lock fdc while usage count=0\n")) 893 return -1; 894 895 if (wait_event_interruptible(fdc_wait, !test_and_set_bit(0, &fdc_busy))) 896 return -EINTR; 897 898 command_status = FD_COMMAND_NONE; 899 900 reschedule_timeout(drive, "lock fdc"); 901 set_fdc(drive); 902 return 0; 903 } 904 905 /* unlocks the driver */ 906 static void unlock_fdc(void) 907 { 908 if (!test_bit(0, &fdc_busy)) 909 DPRINT("FDC access conflict!\n"); 910 911 raw_cmd = NULL; 912 command_status = FD_COMMAND_NONE; 913 cancel_delayed_work(&fd_timeout); 914 do_floppy = NULL; 915 cont = NULL; 916 clear_bit(0, &fdc_busy); 917 wake_up(&fdc_wait); 918 } 919 920 /* switches the motor off after a given timeout */ 921 static void motor_off_callback(struct timer_list *t) 922 { 923 unsigned long nr = t - motor_off_timer; 924 unsigned char mask = ~(0x10 << UNIT(nr)); 925 926 if (WARN_ON_ONCE(nr >= N_DRIVE)) 927 return; 928 929 set_dor(FDC(nr), mask, 0); 930 } 931 932 /* schedules motor off */ 933 static void floppy_off(unsigned int drive) 934 { 935 unsigned long volatile delta; 936 int fdc = FDC(drive); 937 938 if (!(fdc_state[fdc].dor & (0x10 << UNIT(drive)))) 939 return; 940 941 del_timer(motor_off_timer + drive); 942 943 /* make spindle stop in a position which minimizes spinup time 944 * next time */ 945 if (drive_params[drive].rps) { 946 delta = jiffies - drive_state[drive].first_read_date + HZ - 947 drive_params[drive].spindown_offset; 948 delta = ((delta * drive_params[drive].rps) % HZ) / drive_params[drive].rps; 949 motor_off_timer[drive].expires = 950 jiffies + drive_params[drive].spindown - delta; 951 } 952 add_timer(motor_off_timer + drive); 953 } 954 955 /* 956 * cycle through all N_DRIVE floppy drives, for disk change testing. 957 * stopping at current drive. This is done before any long operation, to 958 * be sure to have up to date disk change information. 959 */ 960 static void scandrives(void) 961 { 962 int i; 963 int drive; 964 int saved_drive; 965 966 if (drive_params[current_drive].select_delay) 967 return; 968 969 saved_drive = current_drive; 970 for (i = 0; i < N_DRIVE; i++) { 971 drive = (saved_drive + i + 1) % N_DRIVE; 972 if (drive_state[drive].fd_ref == 0 || drive_params[drive].select_delay != 0) 973 continue; /* skip closed drives */ 974 set_fdc(drive); 975 if (!(set_dor(current_fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) & 976 (0x10 << UNIT(drive)))) 977 /* switch the motor off again, if it was off to 978 * begin with */ 979 set_dor(current_fdc, ~(0x10 << UNIT(drive)), 0); 980 } 981 set_fdc(saved_drive); 982 } 983 984 static void empty(void) 985 { 986 } 987 988 static void (*floppy_work_fn)(void); 989 990 static void floppy_work_workfn(struct work_struct *work) 991 { 992 floppy_work_fn(); 993 } 994 995 static DECLARE_WORK(floppy_work, floppy_work_workfn); 996 997 static void schedule_bh(void (*handler)(void)) 998 { 999 WARN_ON(work_pending(&floppy_work)); 1000 1001 floppy_work_fn = handler; 1002 queue_work(floppy_wq, &floppy_work); 1003 } 1004 1005 static void (*fd_timer_fn)(void) = NULL; 1006 1007 static void fd_timer_workfn(struct work_struct *work) 1008 { 1009 fd_timer_fn(); 1010 } 1011 1012 static DECLARE_DELAYED_WORK(fd_timer, fd_timer_workfn); 1013 1014 static void cancel_activity(void) 1015 { 1016 do_floppy = NULL; 1017 cancel_delayed_work(&fd_timer); 1018 cancel_work_sync(&floppy_work); 1019 } 1020 1021 /* this function makes sure that the disk stays in the drive during the 1022 * transfer */ 1023 static void fd_watchdog(void) 1024 { 1025 debug_dcl(drive_params[current_drive].flags, 1026 "calling disk change from watchdog\n"); 1027 1028 if (disk_change(current_drive)) { 1029 DPRINT("disk removed during i/o\n"); 1030 cancel_activity(); 1031 cont->done(0); 1032 reset_fdc(); 1033 } else { 1034 cancel_delayed_work(&fd_timer); 1035 fd_timer_fn = fd_watchdog; 1036 queue_delayed_work(floppy_wq, &fd_timer, HZ / 10); 1037 } 1038 } 1039 1040 static void main_command_interrupt(void) 1041 { 1042 cancel_delayed_work(&fd_timer); 1043 cont->interrupt(); 1044 } 1045 1046 /* waits for a delay (spinup or select) to pass */ 1047 static int fd_wait_for_completion(unsigned long expires, 1048 void (*function)(void)) 1049 { 1050 if (fdc_state[current_fdc].reset) { 1051 reset_fdc(); /* do the reset during sleep to win time 1052 * if we don't need to sleep, it's a good 1053 * occasion anyways */ 1054 return 1; 1055 } 1056 1057 if (time_before(jiffies, expires)) { 1058 cancel_delayed_work(&fd_timer); 1059 fd_timer_fn = function; 1060 queue_delayed_work(floppy_wq, &fd_timer, expires - jiffies); 1061 return 1; 1062 } 1063 return 0; 1064 } 1065 1066 static void setup_DMA(void) 1067 { 1068 unsigned long f; 1069 1070 if (raw_cmd->length == 0) { 1071 print_hex_dump(KERN_INFO, "zero dma transfer size: ", 1072 DUMP_PREFIX_NONE, 16, 1, 1073 raw_cmd->fullcmd, raw_cmd->cmd_count, false); 1074 cont->done(0); 1075 fdc_state[current_fdc].reset = 1; 1076 return; 1077 } 1078 if (((unsigned long)raw_cmd->kernel_data) % 512) { 1079 pr_info("non aligned address: %p\n", raw_cmd->kernel_data); 1080 cont->done(0); 1081 fdc_state[current_fdc].reset = 1; 1082 return; 1083 } 1084 f = claim_dma_lock(); 1085 fd_disable_dma(); 1086 #ifdef fd_dma_setup 1087 if (fd_dma_setup(raw_cmd->kernel_data, raw_cmd->length, 1088 (raw_cmd->flags & FD_RAW_READ) ? 1089 DMA_MODE_READ : DMA_MODE_WRITE, 1090 fdc_state[current_fdc].address) < 0) { 1091 release_dma_lock(f); 1092 cont->done(0); 1093 fdc_state[current_fdc].reset = 1; 1094 return; 1095 } 1096 release_dma_lock(f); 1097 #else 1098 fd_clear_dma_ff(); 1099 fd_cacheflush(raw_cmd->kernel_data, raw_cmd->length); 1100 fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ) ? 1101 DMA_MODE_READ : DMA_MODE_WRITE); 1102 fd_set_dma_addr(raw_cmd->kernel_data); 1103 fd_set_dma_count(raw_cmd->length); 1104 virtual_dma_port = fdc_state[current_fdc].address; 1105 fd_enable_dma(); 1106 release_dma_lock(f); 1107 #endif 1108 } 1109 1110 static void show_floppy(int fdc); 1111 1112 /* waits until the fdc becomes ready */ 1113 static int wait_til_ready(int fdc) 1114 { 1115 int status; 1116 int counter; 1117 1118 if (fdc_state[fdc].reset) 1119 return -1; 1120 for (counter = 0; counter < 10000; counter++) { 1121 status = fdc_inb(fdc, FD_STATUS); 1122 if (status & STATUS_READY) 1123 return status; 1124 } 1125 if (initialized) { 1126 DPRINT("Getstatus times out (%x) on fdc %d\n", status, fdc); 1127 show_floppy(fdc); 1128 } 1129 fdc_state[fdc].reset = 1; 1130 return -1; 1131 } 1132 1133 /* sends a command byte to the fdc */ 1134 static int output_byte(int fdc, char byte) 1135 { 1136 int status = wait_til_ready(fdc); 1137 1138 if (status < 0) 1139 return -1; 1140 1141 if (is_ready_state(status)) { 1142 fdc_outb(byte, fdc, FD_DATA); 1143 output_log[output_log_pos].data = byte; 1144 output_log[output_log_pos].status = status; 1145 output_log[output_log_pos].jiffies = jiffies; 1146 output_log_pos = (output_log_pos + 1) % OLOGSIZE; 1147 return 0; 1148 } 1149 fdc_state[fdc].reset = 1; 1150 if (initialized) { 1151 DPRINT("Unable to send byte %x to FDC. Fdc=%x Status=%x\n", 1152 byte, fdc, status); 1153 show_floppy(fdc); 1154 } 1155 return -1; 1156 } 1157 1158 /* gets the response from the fdc */ 1159 static int result(int fdc) 1160 { 1161 int i; 1162 int status = 0; 1163 1164 for (i = 0; i < FD_RAW_REPLY_SIZE; i++) { 1165 status = wait_til_ready(fdc); 1166 if (status < 0) 1167 break; 1168 status &= STATUS_DIR | STATUS_READY | STATUS_BUSY | STATUS_DMA; 1169 if ((status & ~STATUS_BUSY) == STATUS_READY) { 1170 resultjiffies = jiffies; 1171 resultsize = i; 1172 return i; 1173 } 1174 if (status == (STATUS_DIR | STATUS_READY | STATUS_BUSY)) 1175 reply_buffer[i] = fdc_inb(fdc, FD_DATA); 1176 else 1177 break; 1178 } 1179 if (initialized) { 1180 DPRINT("get result error. Fdc=%d Last status=%x Read bytes=%d\n", 1181 fdc, status, i); 1182 show_floppy(fdc); 1183 } 1184 fdc_state[fdc].reset = 1; 1185 return -1; 1186 } 1187 1188 #define MORE_OUTPUT -2 1189 /* does the fdc need more output? */ 1190 static int need_more_output(int fdc) 1191 { 1192 int status = wait_til_ready(fdc); 1193 1194 if (status < 0) 1195 return -1; 1196 1197 if (is_ready_state(status)) 1198 return MORE_OUTPUT; 1199 1200 return result(fdc); 1201 } 1202 1203 /* Set perpendicular mode as required, based on data rate, if supported. 1204 * 82077 Now tested. 1Mbps data rate only possible with 82077-1. 1205 */ 1206 static void perpendicular_mode(int fdc) 1207 { 1208 unsigned char perp_mode; 1209 1210 if (raw_cmd->rate & 0x40) { 1211 switch (raw_cmd->rate & 3) { 1212 case 0: 1213 perp_mode = 2; 1214 break; 1215 case 3: 1216 perp_mode = 3; 1217 break; 1218 default: 1219 DPRINT("Invalid data rate for perpendicular mode!\n"); 1220 cont->done(0); 1221 fdc_state[fdc].reset = 1; 1222 /* 1223 * convenient way to return to 1224 * redo without too much hassle 1225 * (deep stack et al.) 1226 */ 1227 return; 1228 } 1229 } else 1230 perp_mode = 0; 1231 1232 if (fdc_state[fdc].perp_mode == perp_mode) 1233 return; 1234 if (fdc_state[fdc].version >= FDC_82077_ORIG) { 1235 output_byte(fdc, FD_PERPENDICULAR); 1236 output_byte(fdc, perp_mode); 1237 fdc_state[fdc].perp_mode = perp_mode; 1238 } else if (perp_mode) { 1239 DPRINT("perpendicular mode not supported by this FDC.\n"); 1240 } 1241 } /* perpendicular_mode */ 1242 1243 static int fifo_depth = 0xa; 1244 static int no_fifo; 1245 1246 static int fdc_configure(int fdc) 1247 { 1248 /* Turn on FIFO */ 1249 output_byte(fdc, FD_CONFIGURE); 1250 if (need_more_output(fdc) != MORE_OUTPUT) 1251 return 0; 1252 output_byte(fdc, 0); 1253 output_byte(fdc, 0x10 | (no_fifo & 0x20) | (fifo_depth & 0xf)); 1254 output_byte(fdc, 0); /* pre-compensation from track 0 upwards */ 1255 return 1; 1256 } 1257 1258 #define NOMINAL_DTR 500 1259 1260 /* Issue a "SPECIFY" command to set the step rate time, head unload time, 1261 * head load time, and DMA disable flag to values needed by floppy. 1262 * 1263 * The value "dtr" is the data transfer rate in Kbps. It is needed 1264 * to account for the data rate-based scaling done by the 82072 and 82077 1265 * FDC types. This parameter is ignored for other types of FDCs (i.e. 1266 * 8272a). 1267 * 1268 * Note that changing the data transfer rate has a (probably deleterious) 1269 * effect on the parameters subject to scaling for 82072/82077 FDCs, so 1270 * fdc_specify is called again after each data transfer rate 1271 * change. 1272 * 1273 * srt: 1000 to 16000 in microseconds 1274 * hut: 16 to 240 milliseconds 1275 * hlt: 2 to 254 milliseconds 1276 * 1277 * These values are rounded up to the next highest available delay time. 1278 */ 1279 static void fdc_specify(int fdc, int drive) 1280 { 1281 unsigned char spec1; 1282 unsigned char spec2; 1283 unsigned long srt; 1284 unsigned long hlt; 1285 unsigned long hut; 1286 unsigned long dtr = NOMINAL_DTR; 1287 unsigned long scale_dtr = NOMINAL_DTR; 1288 int hlt_max_code = 0x7f; 1289 int hut_max_code = 0xf; 1290 1291 if (fdc_state[fdc].need_configure && 1292 fdc_state[fdc].version >= FDC_82072A) { 1293 fdc_configure(fdc); 1294 fdc_state[fdc].need_configure = 0; 1295 } 1296 1297 switch (raw_cmd->rate & 0x03) { 1298 case 3: 1299 dtr = 1000; 1300 break; 1301 case 1: 1302 dtr = 300; 1303 if (fdc_state[fdc].version >= FDC_82078) { 1304 /* chose the default rate table, not the one 1305 * where 1 = 2 Mbps */ 1306 output_byte(fdc, FD_DRIVESPEC); 1307 if (need_more_output(fdc) == MORE_OUTPUT) { 1308 output_byte(fdc, UNIT(drive)); 1309 output_byte(fdc, 0xc0); 1310 } 1311 } 1312 break; 1313 case 2: 1314 dtr = 250; 1315 break; 1316 } 1317 1318 if (fdc_state[fdc].version >= FDC_82072) { 1319 scale_dtr = dtr; 1320 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */ 1321 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */ 1322 } 1323 1324 /* Convert step rate from microseconds to milliseconds and 4 bits */ 1325 srt = 16 - DIV_ROUND_UP(drive_params[drive].srt * scale_dtr / 1000, 1326 NOMINAL_DTR); 1327 if (slow_floppy) 1328 srt = srt / 4; 1329 1330 SUPBOUND(srt, 0xf); 1331 INFBOUND(srt, 0); 1332 1333 hlt = DIV_ROUND_UP(drive_params[drive].hlt * scale_dtr / 2, 1334 NOMINAL_DTR); 1335 if (hlt < 0x01) 1336 hlt = 0x01; 1337 else if (hlt > 0x7f) 1338 hlt = hlt_max_code; 1339 1340 hut = DIV_ROUND_UP(drive_params[drive].hut * scale_dtr / 16, 1341 NOMINAL_DTR); 1342 if (hut < 0x1) 1343 hut = 0x1; 1344 else if (hut > 0xf) 1345 hut = hut_max_code; 1346 1347 spec1 = (srt << 4) | hut; 1348 spec2 = (hlt << 1) | (use_virtual_dma & 1); 1349 1350 /* If these parameters did not change, just return with success */ 1351 if (fdc_state[fdc].spec1 != spec1 || 1352 fdc_state[fdc].spec2 != spec2) { 1353 /* Go ahead and set spec1 and spec2 */ 1354 output_byte(fdc, FD_SPECIFY); 1355 output_byte(fdc, fdc_state[fdc].spec1 = spec1); 1356 output_byte(fdc, fdc_state[fdc].spec2 = spec2); 1357 } 1358 } /* fdc_specify */ 1359 1360 /* Set the FDC's data transfer rate on behalf of the specified drive. 1361 * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue 1362 * of the specify command (i.e. using the fdc_specify function). 1363 */ 1364 static int fdc_dtr(void) 1365 { 1366 /* If data rate not already set to desired value, set it. */ 1367 if ((raw_cmd->rate & 3) == fdc_state[current_fdc].dtr) 1368 return 0; 1369 1370 /* Set dtr */ 1371 fdc_outb(raw_cmd->rate & 3, current_fdc, FD_DCR); 1372 1373 /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB) 1374 * need a stabilization period of several milliseconds to be 1375 * enforced after data rate changes before R/W operations. 1376 * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies) 1377 */ 1378 fdc_state[current_fdc].dtr = raw_cmd->rate & 3; 1379 return fd_wait_for_completion(jiffies + 2UL * HZ / 100, floppy_ready); 1380 } /* fdc_dtr */ 1381 1382 static void tell_sector(void) 1383 { 1384 pr_cont(": track %d, head %d, sector %d, size %d", 1385 reply_buffer[R_TRACK], reply_buffer[R_HEAD], 1386 reply_buffer[R_SECTOR], 1387 reply_buffer[R_SIZECODE]); 1388 } /* tell_sector */ 1389 1390 static void print_errors(void) 1391 { 1392 DPRINT(""); 1393 if (reply_buffer[ST0] & ST0_ECE) { 1394 pr_cont("Recalibrate failed!"); 1395 } else if (reply_buffer[ST2] & ST2_CRC) { 1396 pr_cont("data CRC error"); 1397 tell_sector(); 1398 } else if (reply_buffer[ST1] & ST1_CRC) { 1399 pr_cont("CRC error"); 1400 tell_sector(); 1401 } else if ((reply_buffer[ST1] & (ST1_MAM | ST1_ND)) || 1402 (reply_buffer[ST2] & ST2_MAM)) { 1403 if (!probing) { 1404 pr_cont("sector not found"); 1405 tell_sector(); 1406 } else 1407 pr_cont("probe failed..."); 1408 } else if (reply_buffer[ST2] & ST2_WC) { /* seek error */ 1409 pr_cont("wrong cylinder"); 1410 } else if (reply_buffer[ST2] & ST2_BC) { /* cylinder marked as bad */ 1411 pr_cont("bad cylinder"); 1412 } else { 1413 pr_cont("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x", 1414 reply_buffer[ST0], reply_buffer[ST1], 1415 reply_buffer[ST2]); 1416 tell_sector(); 1417 } 1418 pr_cont("\n"); 1419 } 1420 1421 /* 1422 * OK, this error interpreting routine is called after a 1423 * DMA read/write has succeeded 1424 * or failed, so we check the results, and copy any buffers. 1425 * hhb: Added better error reporting. 1426 * ak: Made this into a separate routine. 1427 */ 1428 static int interpret_errors(void) 1429 { 1430 char bad; 1431 1432 if (inr != 7) { 1433 DPRINT("-- FDC reply error\n"); 1434 fdc_state[current_fdc].reset = 1; 1435 return 1; 1436 } 1437 1438 /* check IC to find cause of interrupt */ 1439 switch (reply_buffer[ST0] & ST0_INTR) { 1440 case 0x40: /* error occurred during command execution */ 1441 if (reply_buffer[ST1] & ST1_EOC) 1442 return 0; /* occurs with pseudo-DMA */ 1443 bad = 1; 1444 if (reply_buffer[ST1] & ST1_WP) { 1445 DPRINT("Drive is write protected\n"); 1446 clear_bit(FD_DISK_WRITABLE_BIT, 1447 &drive_state[current_drive].flags); 1448 cont->done(0); 1449 bad = 2; 1450 } else if (reply_buffer[ST1] & ST1_ND) { 1451 set_bit(FD_NEED_TWADDLE_BIT, 1452 &drive_state[current_drive].flags); 1453 } else if (reply_buffer[ST1] & ST1_OR) { 1454 if (drive_params[current_drive].flags & FTD_MSG) 1455 DPRINT("Over/Underrun - retrying\n"); 1456 bad = 0; 1457 } else if (floppy_errors >= drive_params[current_drive].max_errors.reporting) { 1458 print_errors(); 1459 } 1460 if (reply_buffer[ST2] & ST2_WC || reply_buffer[ST2] & ST2_BC) 1461 /* wrong cylinder => recal */ 1462 drive_state[current_drive].track = NEED_2_RECAL; 1463 return bad; 1464 case 0x80: /* invalid command given */ 1465 DPRINT("Invalid FDC command given!\n"); 1466 cont->done(0); 1467 return 2; 1468 case 0xc0: 1469 DPRINT("Abnormal termination caused by polling\n"); 1470 cont->error(); 1471 return 2; 1472 default: /* (0) Normal command termination */ 1473 return 0; 1474 } 1475 } 1476 1477 /* 1478 * This routine is called when everything should be correctly set up 1479 * for the transfer (i.e. floppy motor is on, the correct floppy is 1480 * selected, and the head is sitting on the right track). 1481 */ 1482 static void setup_rw_floppy(void) 1483 { 1484 int i; 1485 int r; 1486 int flags; 1487 unsigned long ready_date; 1488 void (*function)(void); 1489 1490 flags = raw_cmd->flags; 1491 if (flags & (FD_RAW_READ | FD_RAW_WRITE)) 1492 flags |= FD_RAW_INTR; 1493 1494 if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)) { 1495 ready_date = drive_state[current_drive].spinup_date + drive_params[current_drive].spinup; 1496 /* If spinup will take a long time, rerun scandrives 1497 * again just before spinup completion. Beware that 1498 * after scandrives, we must again wait for selection. 1499 */ 1500 if (time_after(ready_date, jiffies + drive_params[current_drive].select_delay)) { 1501 ready_date -= drive_params[current_drive].select_delay; 1502 function = floppy_start; 1503 } else 1504 function = setup_rw_floppy; 1505 1506 /* wait until the floppy is spinning fast enough */ 1507 if (fd_wait_for_completion(ready_date, function)) 1508 return; 1509 } 1510 if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE)) 1511 setup_DMA(); 1512 1513 if (flags & FD_RAW_INTR) 1514 do_floppy = main_command_interrupt; 1515 1516 r = 0; 1517 for (i = 0; i < raw_cmd->cmd_count; i++) 1518 r |= output_byte(current_fdc, raw_cmd->fullcmd[i]); 1519 1520 debugt(__func__, "rw_command"); 1521 1522 if (r) { 1523 cont->error(); 1524 reset_fdc(); 1525 return; 1526 } 1527 1528 if (!(flags & FD_RAW_INTR)) { 1529 inr = result(current_fdc); 1530 cont->interrupt(); 1531 } else if (flags & FD_RAW_NEED_DISK) 1532 fd_watchdog(); 1533 } 1534 1535 static int blind_seek; 1536 1537 /* 1538 * This is the routine called after every seek (or recalibrate) interrupt 1539 * from the floppy controller. 1540 */ 1541 static void seek_interrupt(void) 1542 { 1543 debugt(__func__, ""); 1544 if (inr != 2 || (reply_buffer[ST0] & 0xF8) != 0x20) { 1545 DPRINT("seek failed\n"); 1546 drive_state[current_drive].track = NEED_2_RECAL; 1547 cont->error(); 1548 cont->redo(); 1549 return; 1550 } 1551 if (drive_state[current_drive].track >= 0 && 1552 drive_state[current_drive].track != reply_buffer[ST1] && 1553 !blind_seek) { 1554 debug_dcl(drive_params[current_drive].flags, 1555 "clearing NEWCHANGE flag because of effective seek\n"); 1556 debug_dcl(drive_params[current_drive].flags, "jiffies=%lu\n", 1557 jiffies); 1558 clear_bit(FD_DISK_NEWCHANGE_BIT, 1559 &drive_state[current_drive].flags); 1560 /* effective seek */ 1561 drive_state[current_drive].select_date = jiffies; 1562 } 1563 drive_state[current_drive].track = reply_buffer[ST1]; 1564 floppy_ready(); 1565 } 1566 1567 static void check_wp(int fdc, int drive) 1568 { 1569 if (test_bit(FD_VERIFY_BIT, &drive_state[drive].flags)) { 1570 /* check write protection */ 1571 output_byte(fdc, FD_GETSTATUS); 1572 output_byte(fdc, UNIT(drive)); 1573 if (result(fdc) != 1) { 1574 fdc_state[fdc].reset = 1; 1575 return; 1576 } 1577 clear_bit(FD_VERIFY_BIT, &drive_state[drive].flags); 1578 clear_bit(FD_NEED_TWADDLE_BIT, 1579 &drive_state[drive].flags); 1580 debug_dcl(drive_params[drive].flags, 1581 "checking whether disk is write protected\n"); 1582 debug_dcl(drive_params[drive].flags, "wp=%x\n", 1583 reply_buffer[ST3] & 0x40); 1584 if (!(reply_buffer[ST3] & 0x40)) 1585 set_bit(FD_DISK_WRITABLE_BIT, 1586 &drive_state[drive].flags); 1587 else 1588 clear_bit(FD_DISK_WRITABLE_BIT, 1589 &drive_state[drive].flags); 1590 } 1591 } 1592 1593 static void seek_floppy(void) 1594 { 1595 int track; 1596 1597 blind_seek = 0; 1598 1599 debug_dcl(drive_params[current_drive].flags, 1600 "calling disk change from %s\n", __func__); 1601 1602 if (!test_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[current_drive].flags) && 1603 disk_change(current_drive) && (raw_cmd->flags & FD_RAW_NEED_DISK)) { 1604 /* the media changed flag should be cleared after the seek. 1605 * If it isn't, this means that there is really no disk in 1606 * the drive. 1607 */ 1608 set_bit(FD_DISK_CHANGED_BIT, 1609 &drive_state[current_drive].flags); 1610 cont->done(0); 1611 cont->redo(); 1612 return; 1613 } 1614 if (drive_state[current_drive].track <= NEED_1_RECAL) { 1615 recalibrate_floppy(); 1616 return; 1617 } else if (test_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[current_drive].flags) && 1618 (raw_cmd->flags & FD_RAW_NEED_DISK) && 1619 (drive_state[current_drive].track <= NO_TRACK || drive_state[current_drive].track == raw_cmd->track)) { 1620 /* we seek to clear the media-changed condition. Does anybody 1621 * know a more elegant way, which works on all drives? */ 1622 if (raw_cmd->track) 1623 track = raw_cmd->track - 1; 1624 else { 1625 if (drive_params[current_drive].flags & FD_SILENT_DCL_CLEAR) { 1626 set_dor(current_fdc, ~(0x10 << UNIT(current_drive)), 0); 1627 blind_seek = 1; 1628 raw_cmd->flags |= FD_RAW_NEED_SEEK; 1629 } 1630 track = 1; 1631 } 1632 } else { 1633 check_wp(current_fdc, current_drive); 1634 if (raw_cmd->track != drive_state[current_drive].track && 1635 (raw_cmd->flags & FD_RAW_NEED_SEEK)) 1636 track = raw_cmd->track; 1637 else { 1638 setup_rw_floppy(); 1639 return; 1640 } 1641 } 1642 1643 do_floppy = seek_interrupt; 1644 output_byte(current_fdc, FD_SEEK); 1645 output_byte(current_fdc, UNIT(current_drive)); 1646 if (output_byte(current_fdc, track) < 0) { 1647 reset_fdc(); 1648 return; 1649 } 1650 debugt(__func__, ""); 1651 } 1652 1653 static void recal_interrupt(void) 1654 { 1655 debugt(__func__, ""); 1656 if (inr != 2) 1657 fdc_state[current_fdc].reset = 1; 1658 else if (reply_buffer[ST0] & ST0_ECE) { 1659 switch (drive_state[current_drive].track) { 1660 case NEED_1_RECAL: 1661 debugt(__func__, "need 1 recal"); 1662 /* after a second recalibrate, we still haven't 1663 * reached track 0. Probably no drive. Raise an 1664 * error, as failing immediately might upset 1665 * computers possessed by the Devil :-) */ 1666 cont->error(); 1667 cont->redo(); 1668 return; 1669 case NEED_2_RECAL: 1670 debugt(__func__, "need 2 recal"); 1671 /* If we already did a recalibrate, 1672 * and we are not at track 0, this 1673 * means we have moved. (The only way 1674 * not to move at recalibration is to 1675 * be already at track 0.) Clear the 1676 * new change flag */ 1677 debug_dcl(drive_params[current_drive].flags, 1678 "clearing NEWCHANGE flag because of second recalibrate\n"); 1679 1680 clear_bit(FD_DISK_NEWCHANGE_BIT, 1681 &drive_state[current_drive].flags); 1682 drive_state[current_drive].select_date = jiffies; 1683 fallthrough; 1684 default: 1685 debugt(__func__, "default"); 1686 /* Recalibrate moves the head by at 1687 * most 80 steps. If after one 1688 * recalibrate we don't have reached 1689 * track 0, this might mean that we 1690 * started beyond track 80. Try 1691 * again. */ 1692 drive_state[current_drive].track = NEED_1_RECAL; 1693 break; 1694 } 1695 } else 1696 drive_state[current_drive].track = reply_buffer[ST1]; 1697 floppy_ready(); 1698 } 1699 1700 static void print_result(char *message, int inr) 1701 { 1702 int i; 1703 1704 DPRINT("%s ", message); 1705 if (inr >= 0) 1706 for (i = 0; i < inr; i++) 1707 pr_cont("repl[%d]=%x ", i, reply_buffer[i]); 1708 pr_cont("\n"); 1709 } 1710 1711 /* interrupt handler. Note that this can be called externally on the Sparc */ 1712 irqreturn_t floppy_interrupt(int irq, void *dev_id) 1713 { 1714 int do_print; 1715 unsigned long f; 1716 void (*handler)(void) = do_floppy; 1717 1718 lasthandler = handler; 1719 interruptjiffies = jiffies; 1720 1721 f = claim_dma_lock(); 1722 fd_disable_dma(); 1723 release_dma_lock(f); 1724 1725 do_floppy = NULL; 1726 if (current_fdc >= N_FDC || fdc_state[current_fdc].address == -1) { 1727 /* we don't even know which FDC is the culprit */ 1728 pr_info("DOR0=%x\n", fdc_state[0].dor); 1729 pr_info("floppy interrupt on bizarre fdc %d\n", current_fdc); 1730 pr_info("handler=%ps\n", handler); 1731 is_alive(__func__, "bizarre fdc"); 1732 return IRQ_NONE; 1733 } 1734 1735 fdc_state[current_fdc].reset = 0; 1736 /* We have to clear the reset flag here, because apparently on boxes 1737 * with level triggered interrupts (PS/2, Sparc, ...), it is needed to 1738 * emit SENSEI's to clear the interrupt line. And fdc_state[fdc].reset 1739 * blocks the emission of the SENSEI's. 1740 * It is OK to emit floppy commands because we are in an interrupt 1741 * handler here, and thus we have to fear no interference of other 1742 * activity. 1743 */ 1744 1745 do_print = !handler && print_unex && initialized; 1746 1747 inr = result(current_fdc); 1748 if (do_print) 1749 print_result("unexpected interrupt", inr); 1750 if (inr == 0) { 1751 int max_sensei = 4; 1752 do { 1753 output_byte(current_fdc, FD_SENSEI); 1754 inr = result(current_fdc); 1755 if (do_print) 1756 print_result("sensei", inr); 1757 max_sensei--; 1758 } while ((reply_buffer[ST0] & 0x83) != UNIT(current_drive) && 1759 inr == 2 && max_sensei); 1760 } 1761 if (!handler) { 1762 fdc_state[current_fdc].reset = 1; 1763 return IRQ_NONE; 1764 } 1765 schedule_bh(handler); 1766 is_alive(__func__, "normal interrupt end"); 1767 1768 /* FIXME! Was it really for us? */ 1769 return IRQ_HANDLED; 1770 } 1771 1772 static void recalibrate_floppy(void) 1773 { 1774 debugt(__func__, ""); 1775 do_floppy = recal_interrupt; 1776 output_byte(current_fdc, FD_RECALIBRATE); 1777 if (output_byte(current_fdc, UNIT(current_drive)) < 0) 1778 reset_fdc(); 1779 } 1780 1781 /* 1782 * Must do 4 FD_SENSEIs after reset because of ``drive polling''. 1783 */ 1784 static void reset_interrupt(void) 1785 { 1786 debugt(__func__, ""); 1787 result(current_fdc); /* get the status ready for set_fdc */ 1788 if (fdc_state[current_fdc].reset) { 1789 pr_info("reset set in interrupt, calling %ps\n", cont->error); 1790 cont->error(); /* a reset just after a reset. BAD! */ 1791 } 1792 cont->redo(); 1793 } 1794 1795 /* 1796 * reset is done by pulling bit 2 of DOR low for a while (old FDCs), 1797 * or by setting the self clearing bit 7 of STATUS (newer FDCs). 1798 * This WILL trigger an interrupt, causing the handlers in the current 1799 * cont's ->redo() to be called via reset_interrupt(). 1800 */ 1801 static void reset_fdc(void) 1802 { 1803 unsigned long flags; 1804 1805 do_floppy = reset_interrupt; 1806 fdc_state[current_fdc].reset = 0; 1807 reset_fdc_info(current_fdc, 0); 1808 1809 /* Pseudo-DMA may intercept 'reset finished' interrupt. */ 1810 /* Irrelevant for systems with true DMA (i386). */ 1811 1812 flags = claim_dma_lock(); 1813 fd_disable_dma(); 1814 release_dma_lock(flags); 1815 1816 if (fdc_state[current_fdc].version >= FDC_82072A) 1817 fdc_outb(0x80 | (fdc_state[current_fdc].dtr & 3), 1818 current_fdc, FD_STATUS); 1819 else { 1820 fdc_outb(fdc_state[current_fdc].dor & ~0x04, current_fdc, FD_DOR); 1821 udelay(FD_RESET_DELAY); 1822 fdc_outb(fdc_state[current_fdc].dor, current_fdc, FD_DOR); 1823 } 1824 } 1825 1826 static void show_floppy(int fdc) 1827 { 1828 int i; 1829 1830 pr_info("\n"); 1831 pr_info("floppy driver state\n"); 1832 pr_info("-------------------\n"); 1833 pr_info("now=%lu last interrupt=%lu diff=%lu last called handler=%ps\n", 1834 jiffies, interruptjiffies, jiffies - interruptjiffies, 1835 lasthandler); 1836 1837 pr_info("timeout_message=%s\n", timeout_message); 1838 pr_info("last output bytes:\n"); 1839 for (i = 0; i < OLOGSIZE; i++) 1840 pr_info("%2x %2x %lu\n", 1841 output_log[(i + output_log_pos) % OLOGSIZE].data, 1842 output_log[(i + output_log_pos) % OLOGSIZE].status, 1843 output_log[(i + output_log_pos) % OLOGSIZE].jiffies); 1844 pr_info("last result at %lu\n", resultjiffies); 1845 pr_info("last redo_fd_request at %lu\n", lastredo); 1846 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1, 1847 reply_buffer, resultsize, true); 1848 1849 pr_info("status=%x\n", fdc_inb(fdc, FD_STATUS)); 1850 pr_info("fdc_busy=%lu\n", fdc_busy); 1851 if (do_floppy) 1852 pr_info("do_floppy=%ps\n", do_floppy); 1853 if (work_pending(&floppy_work)) 1854 pr_info("floppy_work.func=%ps\n", floppy_work.func); 1855 if (delayed_work_pending(&fd_timer)) 1856 pr_info("delayed work.function=%p expires=%ld\n", 1857 fd_timer.work.func, 1858 fd_timer.timer.expires - jiffies); 1859 if (delayed_work_pending(&fd_timeout)) 1860 pr_info("timer_function=%p expires=%ld\n", 1861 fd_timeout.work.func, 1862 fd_timeout.timer.expires - jiffies); 1863 1864 pr_info("cont=%p\n", cont); 1865 pr_info("current_req=%p\n", current_req); 1866 pr_info("command_status=%d\n", command_status); 1867 pr_info("\n"); 1868 } 1869 1870 static void floppy_shutdown(struct work_struct *arg) 1871 { 1872 unsigned long flags; 1873 1874 if (initialized) 1875 show_floppy(current_fdc); 1876 cancel_activity(); 1877 1878 flags = claim_dma_lock(); 1879 fd_disable_dma(); 1880 release_dma_lock(flags); 1881 1882 /* avoid dma going to a random drive after shutdown */ 1883 1884 if (initialized) 1885 DPRINT("floppy timeout called\n"); 1886 fdc_state[current_fdc].reset = 1; 1887 if (cont) { 1888 cont->done(0); 1889 cont->redo(); /* this will recall reset when needed */ 1890 } else { 1891 pr_info("no cont in shutdown!\n"); 1892 process_fd_request(); 1893 } 1894 is_alive(__func__, ""); 1895 } 1896 1897 /* start motor, check media-changed condition and write protection */ 1898 static int start_motor(void (*function)(void)) 1899 { 1900 int mask; 1901 int data; 1902 1903 mask = 0xfc; 1904 data = UNIT(current_drive); 1905 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)) { 1906 if (!(fdc_state[current_fdc].dor & (0x10 << UNIT(current_drive)))) { 1907 set_debugt(); 1908 /* no read since this drive is running */ 1909 drive_state[current_drive].first_read_date = 0; 1910 /* note motor start time if motor is not yet running */ 1911 drive_state[current_drive].spinup_date = jiffies; 1912 data |= (0x10 << UNIT(current_drive)); 1913 } 1914 } else if (fdc_state[current_fdc].dor & (0x10 << UNIT(current_drive))) 1915 mask &= ~(0x10 << UNIT(current_drive)); 1916 1917 /* starts motor and selects floppy */ 1918 del_timer(motor_off_timer + current_drive); 1919 set_dor(current_fdc, mask, data); 1920 1921 /* wait_for_completion also schedules reset if needed. */ 1922 return fd_wait_for_completion(drive_state[current_drive].select_date + drive_params[current_drive].select_delay, 1923 function); 1924 } 1925 1926 static void floppy_ready(void) 1927 { 1928 if (fdc_state[current_fdc].reset) { 1929 reset_fdc(); 1930 return; 1931 } 1932 if (start_motor(floppy_ready)) 1933 return; 1934 if (fdc_dtr()) 1935 return; 1936 1937 debug_dcl(drive_params[current_drive].flags, 1938 "calling disk change from floppy_ready\n"); 1939 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) && 1940 disk_change(current_drive) && !drive_params[current_drive].select_delay) 1941 twaddle(current_fdc, current_drive); /* this clears the dcl on certain 1942 * drive/controller combinations */ 1943 1944 #ifdef fd_chose_dma_mode 1945 if ((raw_cmd->flags & FD_RAW_READ) || (raw_cmd->flags & FD_RAW_WRITE)) { 1946 unsigned long flags = claim_dma_lock(); 1947 fd_chose_dma_mode(raw_cmd->kernel_data, raw_cmd->length); 1948 release_dma_lock(flags); 1949 } 1950 #endif 1951 1952 if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)) { 1953 perpendicular_mode(current_fdc); 1954 fdc_specify(current_fdc, current_drive); /* must be done here because of hut, hlt ... */ 1955 seek_floppy(); 1956 } else { 1957 if ((raw_cmd->flags & FD_RAW_READ) || 1958 (raw_cmd->flags & FD_RAW_WRITE)) 1959 fdc_specify(current_fdc, current_drive); 1960 setup_rw_floppy(); 1961 } 1962 } 1963 1964 static void floppy_start(void) 1965 { 1966 reschedule_timeout(current_drive, "floppy start"); 1967 1968 scandrives(); 1969 debug_dcl(drive_params[current_drive].flags, 1970 "setting NEWCHANGE in floppy_start\n"); 1971 set_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[current_drive].flags); 1972 floppy_ready(); 1973 } 1974 1975 /* 1976 * ======================================================================== 1977 * here ends the bottom half. Exported routines are: 1978 * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc, 1979 * start_motor, reset_fdc, reset_fdc_info, interpret_errors. 1980 * Initialization also uses output_byte, result, set_dor, floppy_interrupt 1981 * and set_dor. 1982 * ======================================================================== 1983 */ 1984 /* 1985 * General purpose continuations. 1986 * ============================== 1987 */ 1988 1989 static void do_wakeup(void) 1990 { 1991 reschedule_timeout(MAXTIMEOUT, "do wakeup"); 1992 cont = NULL; 1993 command_status += 2; 1994 wake_up(&command_done); 1995 } 1996 1997 static const struct cont_t wakeup_cont = { 1998 .interrupt = empty, 1999 .redo = do_wakeup, 2000 .error = empty, 2001 .done = (done_f)empty 2002 }; 2003 2004 static const struct cont_t intr_cont = { 2005 .interrupt = empty, 2006 .redo = process_fd_request, 2007 .error = empty, 2008 .done = (done_f)empty 2009 }; 2010 2011 /* schedules handler, waiting for completion. May be interrupted, will then 2012 * return -EINTR, in which case the driver will automatically be unlocked. 2013 */ 2014 static int wait_til_done(void (*handler)(void), bool interruptible) 2015 { 2016 int ret; 2017 2018 schedule_bh(handler); 2019 2020 if (interruptible) 2021 wait_event_interruptible(command_done, command_status >= 2); 2022 else 2023 wait_event(command_done, command_status >= 2); 2024 2025 if (command_status < 2) { 2026 cancel_activity(); 2027 cont = &intr_cont; 2028 reset_fdc(); 2029 return -EINTR; 2030 } 2031 2032 if (fdc_state[current_fdc].reset) 2033 command_status = FD_COMMAND_ERROR; 2034 if (command_status == FD_COMMAND_OKAY) 2035 ret = 0; 2036 else 2037 ret = -EIO; 2038 command_status = FD_COMMAND_NONE; 2039 return ret; 2040 } 2041 2042 static void generic_done(int result) 2043 { 2044 command_status = result; 2045 cont = &wakeup_cont; 2046 } 2047 2048 static void generic_success(void) 2049 { 2050 cont->done(1); 2051 } 2052 2053 static void generic_failure(void) 2054 { 2055 cont->done(0); 2056 } 2057 2058 static void success_and_wakeup(void) 2059 { 2060 generic_success(); 2061 cont->redo(); 2062 } 2063 2064 /* 2065 * formatting and rw support. 2066 * ========================== 2067 */ 2068 2069 static int next_valid_format(int drive) 2070 { 2071 int probed_format; 2072 2073 probed_format = drive_state[drive].probed_format; 2074 while (1) { 2075 if (probed_format >= FD_AUTODETECT_SIZE || 2076 !drive_params[drive].autodetect[probed_format]) { 2077 drive_state[drive].probed_format = 0; 2078 return 1; 2079 } 2080 if (floppy_type[drive_params[drive].autodetect[probed_format]].sect) { 2081 drive_state[drive].probed_format = probed_format; 2082 return 0; 2083 } 2084 probed_format++; 2085 } 2086 } 2087 2088 static void bad_flp_intr(void) 2089 { 2090 int err_count; 2091 2092 if (probing) { 2093 drive_state[current_drive].probed_format++; 2094 if (!next_valid_format(current_drive)) 2095 return; 2096 } 2097 err_count = ++floppy_errors; 2098 INFBOUND(write_errors[current_drive].badness, err_count); 2099 if (err_count > drive_params[current_drive].max_errors.abort) 2100 cont->done(0); 2101 if (err_count > drive_params[current_drive].max_errors.reset) 2102 fdc_state[current_fdc].reset = 1; 2103 else if (err_count > drive_params[current_drive].max_errors.recal) 2104 drive_state[current_drive].track = NEED_2_RECAL; 2105 } 2106 2107 static void set_floppy(int drive) 2108 { 2109 int type = ITYPE(drive_state[drive].fd_device); 2110 2111 if (type) 2112 _floppy = floppy_type + type; 2113 else 2114 _floppy = current_type[drive]; 2115 } 2116 2117 /* 2118 * formatting support. 2119 * =================== 2120 */ 2121 static void format_interrupt(void) 2122 { 2123 switch (interpret_errors()) { 2124 case 1: 2125 cont->error(); 2126 break; 2127 case 2: 2128 break; 2129 case 0: 2130 cont->done(1); 2131 } 2132 cont->redo(); 2133 } 2134 2135 #define FM_MODE(x, y) ((y) & ~(((x)->rate & 0x80) >> 1)) 2136 #define CT(x) ((x) | 0xc0) 2137 2138 static void setup_format_params(int track) 2139 { 2140 int n; 2141 int il; 2142 int count; 2143 int head_shift; 2144 int track_shift; 2145 struct fparm { 2146 unsigned char track, head, sect, size; 2147 } *here = (struct fparm *)floppy_track_buffer; 2148 2149 raw_cmd = &default_raw_cmd; 2150 raw_cmd->track = track; 2151 2152 raw_cmd->flags = (FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN | 2153 FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK); 2154 raw_cmd->rate = _floppy->rate & 0x43; 2155 raw_cmd->cmd_count = NR_F; 2156 raw_cmd->cmd[COMMAND] = FM_MODE(_floppy, FD_FORMAT); 2157 raw_cmd->cmd[DR_SELECT] = UNIT(current_drive) + PH_HEAD(_floppy, format_req.head); 2158 raw_cmd->cmd[F_SIZECODE] = FD_SIZECODE(_floppy); 2159 raw_cmd->cmd[F_SECT_PER_TRACK] = _floppy->sect << 2 >> raw_cmd->cmd[F_SIZECODE]; 2160 raw_cmd->cmd[F_GAP] = _floppy->fmt_gap; 2161 raw_cmd->cmd[F_FILL] = FD_FILL_BYTE; 2162 2163 raw_cmd->kernel_data = floppy_track_buffer; 2164 raw_cmd->length = 4 * raw_cmd->cmd[F_SECT_PER_TRACK]; 2165 2166 if (!raw_cmd->cmd[F_SECT_PER_TRACK]) 2167 return; 2168 2169 /* allow for about 30ms for data transport per track */ 2170 head_shift = (raw_cmd->cmd[F_SECT_PER_TRACK] + 5) / 6; 2171 2172 /* a ``cylinder'' is two tracks plus a little stepping time */ 2173 track_shift = 2 * head_shift + 3; 2174 2175 /* position of logical sector 1 on this track */ 2176 n = (track_shift * format_req.track + head_shift * format_req.head) 2177 % raw_cmd->cmd[F_SECT_PER_TRACK]; 2178 2179 /* determine interleave */ 2180 il = 1; 2181 if (_floppy->fmt_gap < 0x22) 2182 il++; 2183 2184 /* initialize field */ 2185 for (count = 0; count < raw_cmd->cmd[F_SECT_PER_TRACK]; ++count) { 2186 here[count].track = format_req.track; 2187 here[count].head = format_req.head; 2188 here[count].sect = 0; 2189 here[count].size = raw_cmd->cmd[F_SIZECODE]; 2190 } 2191 /* place logical sectors */ 2192 for (count = 1; count <= raw_cmd->cmd[F_SECT_PER_TRACK]; ++count) { 2193 here[n].sect = count; 2194 n = (n + il) % raw_cmd->cmd[F_SECT_PER_TRACK]; 2195 if (here[n].sect) { /* sector busy, find next free sector */ 2196 ++n; 2197 if (n >= raw_cmd->cmd[F_SECT_PER_TRACK]) { 2198 n -= raw_cmd->cmd[F_SECT_PER_TRACK]; 2199 while (here[n].sect) 2200 ++n; 2201 } 2202 } 2203 } 2204 if (_floppy->stretch & FD_SECTBASEMASK) { 2205 for (count = 0; count < raw_cmd->cmd[F_SECT_PER_TRACK]; count++) 2206 here[count].sect += FD_SECTBASE(_floppy) - 1; 2207 } 2208 } 2209 2210 static void redo_format(void) 2211 { 2212 buffer_track = -1; 2213 setup_format_params(format_req.track << STRETCH(_floppy)); 2214 floppy_start(); 2215 debugt(__func__, "queue format request"); 2216 } 2217 2218 static const struct cont_t format_cont = { 2219 .interrupt = format_interrupt, 2220 .redo = redo_format, 2221 .error = bad_flp_intr, 2222 .done = generic_done 2223 }; 2224 2225 static int do_format(int drive, struct format_descr *tmp_format_req) 2226 { 2227 int ret; 2228 2229 if (lock_fdc(drive)) 2230 return -EINTR; 2231 2232 set_floppy(drive); 2233 if (!_floppy || 2234 _floppy->track > drive_params[current_drive].tracks || 2235 tmp_format_req->track >= _floppy->track || 2236 tmp_format_req->head >= _floppy->head || 2237 (_floppy->sect << 2) % (1 << FD_SIZECODE(_floppy)) || 2238 !_floppy->fmt_gap) { 2239 process_fd_request(); 2240 return -EINVAL; 2241 } 2242 format_req = *tmp_format_req; 2243 cont = &format_cont; 2244 floppy_errors = 0; 2245 ret = wait_til_done(redo_format, true); 2246 if (ret == -EINTR) 2247 return -EINTR; 2248 process_fd_request(); 2249 return ret; 2250 } 2251 2252 /* 2253 * Buffer read/write and support 2254 * ============================= 2255 */ 2256 2257 static void floppy_end_request(struct request *req, blk_status_t error) 2258 { 2259 unsigned int nr_sectors = current_count_sectors; 2260 unsigned int drive = (unsigned long)req->q->disk->private_data; 2261 2262 /* current_count_sectors can be zero if transfer failed */ 2263 if (error) 2264 nr_sectors = blk_rq_cur_sectors(req); 2265 if (blk_update_request(req, error, nr_sectors << 9)) 2266 return; 2267 __blk_mq_end_request(req, error); 2268 2269 /* We're done with the request */ 2270 floppy_off(drive); 2271 current_req = NULL; 2272 } 2273 2274 /* new request_done. Can handle physical sectors which are smaller than a 2275 * logical buffer */ 2276 static void request_done(int uptodate) 2277 { 2278 struct request *req = current_req; 2279 int block; 2280 char msg[sizeof("request done ") + sizeof(int) * 3]; 2281 2282 probing = 0; 2283 snprintf(msg, sizeof(msg), "request done %d", uptodate); 2284 reschedule_timeout(MAXTIMEOUT, msg); 2285 2286 if (!req) { 2287 pr_info("floppy.c: no request in request_done\n"); 2288 return; 2289 } 2290 2291 if (uptodate) { 2292 /* maintain values for invalidation on geometry 2293 * change */ 2294 block = current_count_sectors + blk_rq_pos(req); 2295 INFBOUND(drive_state[current_drive].maxblock, block); 2296 if (block > _floppy->sect) 2297 drive_state[current_drive].maxtrack = 1; 2298 2299 floppy_end_request(req, 0); 2300 } else { 2301 if (rq_data_dir(req) == WRITE) { 2302 /* record write error information */ 2303 write_errors[current_drive].write_errors++; 2304 if (write_errors[current_drive].write_errors == 1) { 2305 write_errors[current_drive].first_error_sector = blk_rq_pos(req); 2306 write_errors[current_drive].first_error_generation = drive_state[current_drive].generation; 2307 } 2308 write_errors[current_drive].last_error_sector = blk_rq_pos(req); 2309 write_errors[current_drive].last_error_generation = drive_state[current_drive].generation; 2310 } 2311 floppy_end_request(req, BLK_STS_IOERR); 2312 } 2313 } 2314 2315 /* Interrupt handler evaluating the result of the r/w operation */ 2316 static void rw_interrupt(void) 2317 { 2318 int eoc; 2319 int ssize; 2320 int heads; 2321 int nr_sectors; 2322 2323 if (reply_buffer[R_HEAD] >= 2) { 2324 /* some Toshiba floppy controllers occasionnally seem to 2325 * return bogus interrupts after read/write operations, which 2326 * can be recognized by a bad head number (>= 2) */ 2327 return; 2328 } 2329 2330 if (!drive_state[current_drive].first_read_date) 2331 drive_state[current_drive].first_read_date = jiffies; 2332 2333 ssize = DIV_ROUND_UP(1 << raw_cmd->cmd[SIZECODE], 4); 2334 2335 if (reply_buffer[ST1] & ST1_EOC) 2336 eoc = 1; 2337 else 2338 eoc = 0; 2339 2340 if (raw_cmd->cmd[COMMAND] & 0x80) 2341 heads = 2; 2342 else 2343 heads = 1; 2344 2345 nr_sectors = (((reply_buffer[R_TRACK] - raw_cmd->cmd[TRACK]) * heads + 2346 reply_buffer[R_HEAD] - raw_cmd->cmd[HEAD]) * raw_cmd->cmd[SECT_PER_TRACK] + 2347 reply_buffer[R_SECTOR] - raw_cmd->cmd[SECTOR] + eoc) << raw_cmd->cmd[SIZECODE] >> 2; 2348 2349 if (nr_sectors / ssize > 2350 DIV_ROUND_UP(in_sector_offset + current_count_sectors, ssize)) { 2351 DPRINT("long rw: %x instead of %lx\n", 2352 nr_sectors, current_count_sectors); 2353 pr_info("rs=%d s=%d\n", reply_buffer[R_SECTOR], 2354 raw_cmd->cmd[SECTOR]); 2355 pr_info("rh=%d h=%d\n", reply_buffer[R_HEAD], 2356 raw_cmd->cmd[HEAD]); 2357 pr_info("rt=%d t=%d\n", reply_buffer[R_TRACK], 2358 raw_cmd->cmd[TRACK]); 2359 pr_info("heads=%d eoc=%d\n", heads, eoc); 2360 pr_info("spt=%d st=%d ss=%d\n", 2361 raw_cmd->cmd[SECT_PER_TRACK], fsector_t, ssize); 2362 pr_info("in_sector_offset=%d\n", in_sector_offset); 2363 } 2364 2365 nr_sectors -= in_sector_offset; 2366 INFBOUND(nr_sectors, 0); 2367 SUPBOUND(current_count_sectors, nr_sectors); 2368 2369 switch (interpret_errors()) { 2370 case 2: 2371 cont->redo(); 2372 return; 2373 case 1: 2374 if (!current_count_sectors) { 2375 cont->error(); 2376 cont->redo(); 2377 return; 2378 } 2379 break; 2380 case 0: 2381 if (!current_count_sectors) { 2382 cont->redo(); 2383 return; 2384 } 2385 current_type[current_drive] = _floppy; 2386 floppy_sizes[TOMINOR(current_drive)] = _floppy->size; 2387 break; 2388 } 2389 2390 if (probing) { 2391 if (drive_params[current_drive].flags & FTD_MSG) 2392 DPRINT("Auto-detected floppy type %s in fd%d\n", 2393 _floppy->name, current_drive); 2394 current_type[current_drive] = _floppy; 2395 floppy_sizes[TOMINOR(current_drive)] = _floppy->size; 2396 probing = 0; 2397 } 2398 2399 if (CT(raw_cmd->cmd[COMMAND]) != FD_READ) { 2400 /* transfer directly from buffer */ 2401 cont->done(1); 2402 } else { 2403 buffer_track = raw_cmd->track; 2404 buffer_drive = current_drive; 2405 INFBOUND(buffer_max, nr_sectors + fsector_t); 2406 } 2407 cont->redo(); 2408 } 2409 2410 /* Compute the maximal transfer size */ 2411 static int transfer_size(int ssize, int max_sector, int max_size) 2412 { 2413 SUPBOUND(max_sector, fsector_t + max_size); 2414 2415 /* alignment */ 2416 max_sector -= (max_sector % _floppy->sect) % ssize; 2417 2418 /* transfer size, beginning not aligned */ 2419 current_count_sectors = max_sector - fsector_t; 2420 2421 return max_sector; 2422 } 2423 2424 /* 2425 * Move data from/to the track buffer to/from the buffer cache. 2426 */ 2427 static void copy_buffer(int ssize, int max_sector, int max_sector_2) 2428 { 2429 int remaining; /* number of transferred 512-byte sectors */ 2430 struct bio_vec bv; 2431 char *dma_buffer; 2432 int size; 2433 struct req_iterator iter; 2434 2435 max_sector = transfer_size(ssize, 2436 min(max_sector, max_sector_2), 2437 blk_rq_sectors(current_req)); 2438 2439 if (current_count_sectors <= 0 && CT(raw_cmd->cmd[COMMAND]) == FD_WRITE && 2440 buffer_max > fsector_t + blk_rq_sectors(current_req)) 2441 current_count_sectors = min_t(int, buffer_max - fsector_t, 2442 blk_rq_sectors(current_req)); 2443 2444 remaining = current_count_sectors << 9; 2445 if (remaining > blk_rq_bytes(current_req) && CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) { 2446 DPRINT("in copy buffer\n"); 2447 pr_info("current_count_sectors=%ld\n", current_count_sectors); 2448 pr_info("remaining=%d\n", remaining >> 9); 2449 pr_info("current_req->nr_sectors=%u\n", 2450 blk_rq_sectors(current_req)); 2451 pr_info("current_req->current_nr_sectors=%u\n", 2452 blk_rq_cur_sectors(current_req)); 2453 pr_info("max_sector=%d\n", max_sector); 2454 pr_info("ssize=%d\n", ssize); 2455 } 2456 2457 buffer_max = max(max_sector, buffer_max); 2458 2459 dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9); 2460 2461 size = blk_rq_cur_bytes(current_req); 2462 2463 rq_for_each_segment(bv, current_req, iter) { 2464 if (!remaining) 2465 break; 2466 2467 size = bv.bv_len; 2468 SUPBOUND(size, remaining); 2469 if (dma_buffer + size > 2470 floppy_track_buffer + (max_buffer_sectors << 10) || 2471 dma_buffer < floppy_track_buffer) { 2472 DPRINT("buffer overrun in copy buffer %d\n", 2473 (int)((floppy_track_buffer - dma_buffer) >> 9)); 2474 pr_info("fsector_t=%d buffer_min=%d\n", 2475 fsector_t, buffer_min); 2476 pr_info("current_count_sectors=%ld\n", 2477 current_count_sectors); 2478 if (CT(raw_cmd->cmd[COMMAND]) == FD_READ) 2479 pr_info("read\n"); 2480 if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) 2481 pr_info("write\n"); 2482 break; 2483 } 2484 2485 if (CT(raw_cmd->cmd[COMMAND]) == FD_READ) 2486 memcpy_to_bvec(&bv, dma_buffer); 2487 else 2488 memcpy_from_bvec(dma_buffer, &bv); 2489 2490 remaining -= size; 2491 dma_buffer += size; 2492 } 2493 if (remaining) { 2494 if (remaining > 0) 2495 max_sector -= remaining >> 9; 2496 DPRINT("weirdness: remaining %d\n", remaining >> 9); 2497 } 2498 } 2499 2500 /* work around a bug in pseudo DMA 2501 * (on some FDCs) pseudo DMA does not stop when the CPU stops 2502 * sending data. Hence we need a different way to signal the 2503 * transfer length: We use raw_cmd->cmd[SECT_PER_TRACK]. Unfortunately, this 2504 * does not work with MT, hence we can only transfer one head at 2505 * a time 2506 */ 2507 static void virtualdmabug_workaround(void) 2508 { 2509 int hard_sectors; 2510 int end_sector; 2511 2512 if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) { 2513 raw_cmd->cmd[COMMAND] &= ~0x80; /* switch off multiple track mode */ 2514 2515 hard_sectors = raw_cmd->length >> (7 + raw_cmd->cmd[SIZECODE]); 2516 end_sector = raw_cmd->cmd[SECTOR] + hard_sectors - 1; 2517 if (end_sector > raw_cmd->cmd[SECT_PER_TRACK]) { 2518 pr_info("too many sectors %d > %d\n", 2519 end_sector, raw_cmd->cmd[SECT_PER_TRACK]); 2520 return; 2521 } 2522 raw_cmd->cmd[SECT_PER_TRACK] = end_sector; 2523 /* make sure raw_cmd->cmd[SECT_PER_TRACK] 2524 * points to end of transfer */ 2525 } 2526 } 2527 2528 /* 2529 * Formulate a read/write request. 2530 * this routine decides where to load the data (directly to buffer, or to 2531 * tmp floppy area), how much data to load (the size of the buffer, the whole 2532 * track, or a single sector) 2533 * All floppy_track_buffer handling goes in here. If we ever add track buffer 2534 * allocation on the fly, it should be done here. No other part should need 2535 * modification. 2536 */ 2537 2538 static int make_raw_rw_request(void) 2539 { 2540 int aligned_sector_t; 2541 int max_sector; 2542 int max_size; 2543 int tracksize; 2544 int ssize; 2545 2546 if (WARN(max_buffer_sectors == 0, "VFS: Block I/O scheduled on unopened device\n")) 2547 return 0; 2548 2549 set_fdc((long)current_req->q->disk->private_data); 2550 2551 raw_cmd = &default_raw_cmd; 2552 raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK; 2553 raw_cmd->cmd_count = NR_RW; 2554 if (rq_data_dir(current_req) == READ) { 2555 raw_cmd->flags |= FD_RAW_READ; 2556 raw_cmd->cmd[COMMAND] = FM_MODE(_floppy, FD_READ); 2557 } else if (rq_data_dir(current_req) == WRITE) { 2558 raw_cmd->flags |= FD_RAW_WRITE; 2559 raw_cmd->cmd[COMMAND] = FM_MODE(_floppy, FD_WRITE); 2560 } else { 2561 DPRINT("%s: unknown command\n", __func__); 2562 return 0; 2563 } 2564 2565 max_sector = _floppy->sect * _floppy->head; 2566 2567 raw_cmd->cmd[TRACK] = (int)blk_rq_pos(current_req) / max_sector; 2568 fsector_t = (int)blk_rq_pos(current_req) % max_sector; 2569 if (_floppy->track && raw_cmd->cmd[TRACK] >= _floppy->track) { 2570 if (blk_rq_cur_sectors(current_req) & 1) { 2571 current_count_sectors = 1; 2572 return 1; 2573 } else 2574 return 0; 2575 } 2576 raw_cmd->cmd[HEAD] = fsector_t / _floppy->sect; 2577 2578 if (((_floppy->stretch & (FD_SWAPSIDES | FD_SECTBASEMASK)) || 2579 test_bit(FD_NEED_TWADDLE_BIT, &drive_state[current_drive].flags)) && 2580 fsector_t < _floppy->sect) 2581 max_sector = _floppy->sect; 2582 2583 /* 2M disks have phantom sectors on the first track */ 2584 if ((_floppy->rate & FD_2M) && (!raw_cmd->cmd[TRACK]) && (!raw_cmd->cmd[HEAD])) { 2585 max_sector = 2 * _floppy->sect / 3; 2586 if (fsector_t >= max_sector) { 2587 current_count_sectors = 2588 min_t(int, _floppy->sect - fsector_t, 2589 blk_rq_sectors(current_req)); 2590 return 1; 2591 } 2592 raw_cmd->cmd[SIZECODE] = 2; 2593 } else 2594 raw_cmd->cmd[SIZECODE] = FD_SIZECODE(_floppy); 2595 raw_cmd->rate = _floppy->rate & 0x43; 2596 if ((_floppy->rate & FD_2M) && 2597 (raw_cmd->cmd[TRACK] || raw_cmd->cmd[HEAD]) && raw_cmd->rate == 2) 2598 raw_cmd->rate = 1; 2599 2600 if (raw_cmd->cmd[SIZECODE]) 2601 raw_cmd->cmd[SIZECODE2] = 0xff; 2602 else 2603 raw_cmd->cmd[SIZECODE2] = 0x80; 2604 raw_cmd->track = raw_cmd->cmd[TRACK] << STRETCH(_floppy); 2605 raw_cmd->cmd[DR_SELECT] = UNIT(current_drive) + PH_HEAD(_floppy, raw_cmd->cmd[HEAD]); 2606 raw_cmd->cmd[GAP] = _floppy->gap; 2607 ssize = DIV_ROUND_UP(1 << raw_cmd->cmd[SIZECODE], 4); 2608 raw_cmd->cmd[SECT_PER_TRACK] = _floppy->sect << 2 >> raw_cmd->cmd[SIZECODE]; 2609 raw_cmd->cmd[SECTOR] = ((fsector_t % _floppy->sect) << 2 >> raw_cmd->cmd[SIZECODE]) + 2610 FD_SECTBASE(_floppy); 2611 2612 /* tracksize describes the size which can be filled up with sectors 2613 * of size ssize. 2614 */ 2615 tracksize = _floppy->sect - _floppy->sect % ssize; 2616 if (tracksize < _floppy->sect) { 2617 raw_cmd->cmd[SECT_PER_TRACK]++; 2618 if (tracksize <= fsector_t % _floppy->sect) 2619 raw_cmd->cmd[SECTOR]--; 2620 2621 /* if we are beyond tracksize, fill up using smaller sectors */ 2622 while (tracksize <= fsector_t % _floppy->sect) { 2623 while (tracksize + ssize > _floppy->sect) { 2624 raw_cmd->cmd[SIZECODE]--; 2625 ssize >>= 1; 2626 } 2627 raw_cmd->cmd[SECTOR]++; 2628 raw_cmd->cmd[SECT_PER_TRACK]++; 2629 tracksize += ssize; 2630 } 2631 max_sector = raw_cmd->cmd[HEAD] * _floppy->sect + tracksize; 2632 } else if (!raw_cmd->cmd[TRACK] && !raw_cmd->cmd[HEAD] && !(_floppy->rate & FD_2M) && probing) { 2633 max_sector = _floppy->sect; 2634 } else if (!raw_cmd->cmd[HEAD] && CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) { 2635 /* for virtual DMA bug workaround */ 2636 max_sector = _floppy->sect; 2637 } 2638 2639 in_sector_offset = (fsector_t % _floppy->sect) % ssize; 2640 aligned_sector_t = fsector_t - in_sector_offset; 2641 max_size = blk_rq_sectors(current_req); 2642 if ((raw_cmd->track == buffer_track) && 2643 (current_drive == buffer_drive) && 2644 (fsector_t >= buffer_min) && (fsector_t < buffer_max)) { 2645 /* data already in track buffer */ 2646 if (CT(raw_cmd->cmd[COMMAND]) == FD_READ) { 2647 copy_buffer(1, max_sector, buffer_max); 2648 return 1; 2649 } 2650 } else if (in_sector_offset || blk_rq_sectors(current_req) < ssize) { 2651 if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) { 2652 unsigned int sectors; 2653 2654 sectors = fsector_t + blk_rq_sectors(current_req); 2655 if (sectors > ssize && sectors < ssize + ssize) 2656 max_size = ssize + ssize; 2657 else 2658 max_size = ssize; 2659 } 2660 raw_cmd->flags &= ~FD_RAW_WRITE; 2661 raw_cmd->flags |= FD_RAW_READ; 2662 raw_cmd->cmd[COMMAND] = FM_MODE(_floppy, FD_READ); 2663 } 2664 2665 if (CT(raw_cmd->cmd[COMMAND]) == FD_READ) 2666 max_size = max_sector; /* unbounded */ 2667 2668 /* claim buffer track if needed */ 2669 if (buffer_track != raw_cmd->track || /* bad track */ 2670 buffer_drive != current_drive || /* bad drive */ 2671 fsector_t > buffer_max || 2672 fsector_t < buffer_min || 2673 ((CT(raw_cmd->cmd[COMMAND]) == FD_READ || 2674 (!in_sector_offset && blk_rq_sectors(current_req) >= ssize)) && 2675 max_sector > 2 * max_buffer_sectors + buffer_min && 2676 max_size + fsector_t > 2 * max_buffer_sectors + buffer_min)) { 2677 /* not enough space */ 2678 buffer_track = -1; 2679 buffer_drive = current_drive; 2680 buffer_max = buffer_min = aligned_sector_t; 2681 } 2682 raw_cmd->kernel_data = floppy_track_buffer + 2683 ((aligned_sector_t - buffer_min) << 9); 2684 2685 if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) { 2686 /* copy write buffer to track buffer. 2687 * if we get here, we know that the write 2688 * is either aligned or the data already in the buffer 2689 * (buffer will be overwritten) */ 2690 if (in_sector_offset && buffer_track == -1) 2691 DPRINT("internal error offset !=0 on write\n"); 2692 buffer_track = raw_cmd->track; 2693 buffer_drive = current_drive; 2694 copy_buffer(ssize, max_sector, 2695 2 * max_buffer_sectors + buffer_min); 2696 } else 2697 transfer_size(ssize, max_sector, 2698 2 * max_buffer_sectors + buffer_min - 2699 aligned_sector_t); 2700 2701 /* round up current_count_sectors to get dma xfer size */ 2702 raw_cmd->length = in_sector_offset + current_count_sectors; 2703 raw_cmd->length = ((raw_cmd->length - 1) | (ssize - 1)) + 1; 2704 raw_cmd->length <<= 9; 2705 if ((raw_cmd->length < current_count_sectors << 9) || 2706 (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE && 2707 (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max || 2708 aligned_sector_t < buffer_min)) || 2709 raw_cmd->length % (128 << raw_cmd->cmd[SIZECODE]) || 2710 raw_cmd->length <= 0 || current_count_sectors <= 0) { 2711 DPRINT("fractionary current count b=%lx s=%lx\n", 2712 raw_cmd->length, current_count_sectors); 2713 pr_info("addr=%d, length=%ld\n", 2714 (int)((raw_cmd->kernel_data - 2715 floppy_track_buffer) >> 9), 2716 current_count_sectors); 2717 pr_info("st=%d ast=%d mse=%d msi=%d\n", 2718 fsector_t, aligned_sector_t, max_sector, max_size); 2719 pr_info("ssize=%x SIZECODE=%d\n", ssize, raw_cmd->cmd[SIZECODE]); 2720 pr_info("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n", 2721 raw_cmd->cmd[COMMAND], raw_cmd->cmd[SECTOR], 2722 raw_cmd->cmd[HEAD], raw_cmd->cmd[TRACK]); 2723 pr_info("buffer drive=%d\n", buffer_drive); 2724 pr_info("buffer track=%d\n", buffer_track); 2725 pr_info("buffer_min=%d\n", buffer_min); 2726 pr_info("buffer_max=%d\n", buffer_max); 2727 return 0; 2728 } 2729 2730 if (raw_cmd->kernel_data < floppy_track_buffer || 2731 current_count_sectors < 0 || 2732 raw_cmd->length < 0 || 2733 raw_cmd->kernel_data + raw_cmd->length > 2734 floppy_track_buffer + (max_buffer_sectors << 10)) { 2735 DPRINT("buffer overrun in schedule dma\n"); 2736 pr_info("fsector_t=%d buffer_min=%d current_count=%ld\n", 2737 fsector_t, buffer_min, raw_cmd->length >> 9); 2738 pr_info("current_count_sectors=%ld\n", 2739 current_count_sectors); 2740 if (CT(raw_cmd->cmd[COMMAND]) == FD_READ) 2741 pr_info("read\n"); 2742 if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) 2743 pr_info("write\n"); 2744 return 0; 2745 } 2746 if (raw_cmd->length == 0) { 2747 DPRINT("zero dma transfer attempted from make_raw_request\n"); 2748 return 0; 2749 } 2750 2751 virtualdmabug_workaround(); 2752 return 2; 2753 } 2754 2755 static int set_next_request(void) 2756 { 2757 current_req = list_first_entry_or_null(&floppy_reqs, struct request, 2758 queuelist); 2759 if (current_req) { 2760 floppy_errors = 0; 2761 list_del_init(¤t_req->queuelist); 2762 return 1; 2763 } 2764 return 0; 2765 } 2766 2767 /* Starts or continues processing request. Will automatically unlock the 2768 * driver at end of request. 2769 */ 2770 static void redo_fd_request(void) 2771 { 2772 int drive; 2773 int tmp; 2774 2775 lastredo = jiffies; 2776 if (current_drive < N_DRIVE) 2777 floppy_off(current_drive); 2778 2779 do_request: 2780 if (!current_req) { 2781 int pending; 2782 2783 spin_lock_irq(&floppy_lock); 2784 pending = set_next_request(); 2785 spin_unlock_irq(&floppy_lock); 2786 if (!pending) { 2787 do_floppy = NULL; 2788 unlock_fdc(); 2789 return; 2790 } 2791 } 2792 drive = (long)current_req->q->disk->private_data; 2793 set_fdc(drive); 2794 reschedule_timeout(current_drive, "redo fd request"); 2795 2796 set_floppy(drive); 2797 raw_cmd = &default_raw_cmd; 2798 raw_cmd->flags = 0; 2799 if (start_motor(redo_fd_request)) 2800 return; 2801 2802 disk_change(current_drive); 2803 if (test_bit(current_drive, &fake_change) || 2804 test_bit(FD_DISK_CHANGED_BIT, &drive_state[current_drive].flags)) { 2805 DPRINT("disk absent or changed during operation\n"); 2806 request_done(0); 2807 goto do_request; 2808 } 2809 if (!_floppy) { /* Autodetection */ 2810 if (!probing) { 2811 drive_state[current_drive].probed_format = 0; 2812 if (next_valid_format(current_drive)) { 2813 DPRINT("no autodetectable formats\n"); 2814 _floppy = NULL; 2815 request_done(0); 2816 goto do_request; 2817 } 2818 } 2819 probing = 1; 2820 _floppy = floppy_type + drive_params[current_drive].autodetect[drive_state[current_drive].probed_format]; 2821 } else 2822 probing = 0; 2823 tmp = make_raw_rw_request(); 2824 if (tmp < 2) { 2825 request_done(tmp); 2826 goto do_request; 2827 } 2828 2829 if (test_bit(FD_NEED_TWADDLE_BIT, &drive_state[current_drive].flags)) 2830 twaddle(current_fdc, current_drive); 2831 schedule_bh(floppy_start); 2832 debugt(__func__, "queue fd request"); 2833 return; 2834 } 2835 2836 static const struct cont_t rw_cont = { 2837 .interrupt = rw_interrupt, 2838 .redo = redo_fd_request, 2839 .error = bad_flp_intr, 2840 .done = request_done 2841 }; 2842 2843 /* schedule the request and automatically unlock the driver on completion */ 2844 static void process_fd_request(void) 2845 { 2846 cont = &rw_cont; 2847 schedule_bh(redo_fd_request); 2848 } 2849 2850 static blk_status_t floppy_queue_rq(struct blk_mq_hw_ctx *hctx, 2851 const struct blk_mq_queue_data *bd) 2852 { 2853 blk_mq_start_request(bd->rq); 2854 2855 if (WARN(max_buffer_sectors == 0, 2856 "VFS: %s called on non-open device\n", __func__)) 2857 return BLK_STS_IOERR; 2858 2859 if (WARN(atomic_read(&usage_count) == 0, 2860 "warning: usage count=0, current_req=%p sect=%ld flags=%llx\n", 2861 current_req, (long)blk_rq_pos(current_req), 2862 (__force unsigned long long) current_req->cmd_flags)) 2863 return BLK_STS_IOERR; 2864 2865 if (test_and_set_bit(0, &fdc_busy)) { 2866 /* fdc busy, this new request will be treated when the 2867 current one is done */ 2868 is_alive(__func__, "old request running"); 2869 return BLK_STS_RESOURCE; 2870 } 2871 2872 spin_lock_irq(&floppy_lock); 2873 list_add_tail(&bd->rq->queuelist, &floppy_reqs); 2874 spin_unlock_irq(&floppy_lock); 2875 2876 command_status = FD_COMMAND_NONE; 2877 __reschedule_timeout(MAXTIMEOUT, "fd_request"); 2878 set_fdc(0); 2879 process_fd_request(); 2880 is_alive(__func__, ""); 2881 return BLK_STS_OK; 2882 } 2883 2884 static const struct cont_t poll_cont = { 2885 .interrupt = success_and_wakeup, 2886 .redo = floppy_ready, 2887 .error = generic_failure, 2888 .done = generic_done 2889 }; 2890 2891 static int poll_drive(bool interruptible, int flag) 2892 { 2893 /* no auto-sense, just clear dcl */ 2894 raw_cmd = &default_raw_cmd; 2895 raw_cmd->flags = flag; 2896 raw_cmd->track = 0; 2897 raw_cmd->cmd_count = 0; 2898 cont = &poll_cont; 2899 debug_dcl(drive_params[current_drive].flags, 2900 "setting NEWCHANGE in poll_drive\n"); 2901 set_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[current_drive].flags); 2902 2903 return wait_til_done(floppy_ready, interruptible); 2904 } 2905 2906 /* 2907 * User triggered reset 2908 * ==================== 2909 */ 2910 2911 static void reset_intr(void) 2912 { 2913 pr_info("weird, reset interrupt called\n"); 2914 } 2915 2916 static const struct cont_t reset_cont = { 2917 .interrupt = reset_intr, 2918 .redo = success_and_wakeup, 2919 .error = generic_failure, 2920 .done = generic_done 2921 }; 2922 2923 /* 2924 * Resets the FDC connected to drive <drive>. 2925 * Both current_drive and current_fdc are changed to match the new drive. 2926 */ 2927 static int user_reset_fdc(int drive, int arg, bool interruptible) 2928 { 2929 int ret; 2930 2931 if (lock_fdc(drive)) 2932 return -EINTR; 2933 2934 if (arg == FD_RESET_ALWAYS) 2935 fdc_state[current_fdc].reset = 1; 2936 if (fdc_state[current_fdc].reset) { 2937 /* note: reset_fdc will take care of unlocking the driver 2938 * on completion. 2939 */ 2940 cont = &reset_cont; 2941 ret = wait_til_done(reset_fdc, interruptible); 2942 if (ret == -EINTR) 2943 return -EINTR; 2944 } 2945 process_fd_request(); 2946 return 0; 2947 } 2948 2949 /* 2950 * Misc Ioctl's and support 2951 * ======================== 2952 */ 2953 static inline int fd_copyout(void __user *param, const void *address, 2954 unsigned long size) 2955 { 2956 return copy_to_user(param, address, size) ? -EFAULT : 0; 2957 } 2958 2959 static inline int fd_copyin(void __user *param, void *address, 2960 unsigned long size) 2961 { 2962 return copy_from_user(address, param, size) ? -EFAULT : 0; 2963 } 2964 2965 static const char *drive_name(int type, int drive) 2966 { 2967 struct floppy_struct *floppy; 2968 2969 if (type) 2970 floppy = floppy_type + type; 2971 else { 2972 if (drive_params[drive].native_format) 2973 floppy = floppy_type + drive_params[drive].native_format; 2974 else 2975 return "(null)"; 2976 } 2977 if (floppy->name) 2978 return floppy->name; 2979 else 2980 return "(null)"; 2981 } 2982 2983 #ifdef CONFIG_BLK_DEV_FD_RAWCMD 2984 2985 /* raw commands */ 2986 static void raw_cmd_done(int flag) 2987 { 2988 if (!flag) { 2989 raw_cmd->flags |= FD_RAW_FAILURE; 2990 raw_cmd->flags |= FD_RAW_HARDFAILURE; 2991 } else { 2992 raw_cmd->reply_count = inr; 2993 if (raw_cmd->reply_count > FD_RAW_REPLY_SIZE) 2994 raw_cmd->reply_count = 0; 2995 memcpy(raw_cmd->reply, reply_buffer, raw_cmd->reply_count); 2996 2997 if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE)) { 2998 unsigned long flags; 2999 flags = claim_dma_lock(); 3000 raw_cmd->length = fd_get_dma_residue(); 3001 release_dma_lock(flags); 3002 } 3003 3004 if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) && 3005 (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0))) 3006 raw_cmd->flags |= FD_RAW_FAILURE; 3007 3008 if (disk_change(current_drive)) 3009 raw_cmd->flags |= FD_RAW_DISK_CHANGE; 3010 else 3011 raw_cmd->flags &= ~FD_RAW_DISK_CHANGE; 3012 if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER) 3013 motor_off_callback(&motor_off_timer[current_drive]); 3014 3015 if (raw_cmd->next && 3016 (!(raw_cmd->flags & FD_RAW_FAILURE) || 3017 !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) && 3018 ((raw_cmd->flags & FD_RAW_FAILURE) || 3019 !(raw_cmd->flags & FD_RAW_STOP_IF_SUCCESS))) { 3020 raw_cmd = raw_cmd->next; 3021 return; 3022 } 3023 } 3024 generic_done(flag); 3025 } 3026 3027 static const struct cont_t raw_cmd_cont = { 3028 .interrupt = success_and_wakeup, 3029 .redo = floppy_start, 3030 .error = generic_failure, 3031 .done = raw_cmd_done 3032 }; 3033 3034 static int raw_cmd_copyout(int cmd, void __user *param, 3035 struct floppy_raw_cmd *ptr) 3036 { 3037 int ret; 3038 3039 while (ptr) { 3040 struct floppy_raw_cmd cmd = *ptr; 3041 cmd.next = NULL; 3042 cmd.kernel_data = NULL; 3043 ret = copy_to_user(param, &cmd, sizeof(cmd)); 3044 if (ret) 3045 return -EFAULT; 3046 param += sizeof(struct floppy_raw_cmd); 3047 if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) { 3048 if (ptr->length >= 0 && 3049 ptr->length <= ptr->buffer_length) { 3050 long length = ptr->buffer_length - ptr->length; 3051 ret = fd_copyout(ptr->data, ptr->kernel_data, 3052 length); 3053 if (ret) 3054 return ret; 3055 } 3056 } 3057 ptr = ptr->next; 3058 } 3059 3060 return 0; 3061 } 3062 3063 static void raw_cmd_free(struct floppy_raw_cmd **ptr) 3064 { 3065 struct floppy_raw_cmd *next; 3066 struct floppy_raw_cmd *this; 3067 3068 this = *ptr; 3069 *ptr = NULL; 3070 while (this) { 3071 if (this->buffer_length) { 3072 fd_dma_mem_free((unsigned long)this->kernel_data, 3073 this->buffer_length); 3074 this->buffer_length = 0; 3075 } 3076 next = this->next; 3077 kfree(this); 3078 this = next; 3079 } 3080 } 3081 3082 #define MAX_LEN (1UL << MAX_ORDER << PAGE_SHIFT) 3083 3084 static int raw_cmd_copyin(int cmd, void __user *param, 3085 struct floppy_raw_cmd **rcmd) 3086 { 3087 struct floppy_raw_cmd *ptr; 3088 int ret; 3089 3090 *rcmd = NULL; 3091 3092 loop: 3093 ptr = kmalloc(sizeof(struct floppy_raw_cmd), GFP_KERNEL); 3094 if (!ptr) 3095 return -ENOMEM; 3096 *rcmd = ptr; 3097 ret = copy_from_user(ptr, param, sizeof(*ptr)); 3098 ptr->next = NULL; 3099 ptr->buffer_length = 0; 3100 ptr->kernel_data = NULL; 3101 if (ret) 3102 return -EFAULT; 3103 param += sizeof(struct floppy_raw_cmd); 3104 if (ptr->cmd_count > FD_RAW_CMD_FULLSIZE) 3105 return -EINVAL; 3106 3107 memset(ptr->reply, 0, FD_RAW_REPLY_SIZE); 3108 ptr->resultcode = 0; 3109 3110 if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) { 3111 if (ptr->length <= 0 || ptr->length > MAX_LEN) 3112 return -EINVAL; 3113 ptr->kernel_data = (char *)fd_dma_mem_alloc(ptr->length); 3114 fallback_on_nodma_alloc(&ptr->kernel_data, ptr->length); 3115 if (!ptr->kernel_data) 3116 return -ENOMEM; 3117 ptr->buffer_length = ptr->length; 3118 } 3119 if (ptr->flags & FD_RAW_WRITE) { 3120 ret = fd_copyin(ptr->data, ptr->kernel_data, ptr->length); 3121 if (ret) 3122 return ret; 3123 } 3124 3125 if (ptr->flags & FD_RAW_MORE) { 3126 rcmd = &(ptr->next); 3127 ptr->rate &= 0x43; 3128 goto loop; 3129 } 3130 3131 return 0; 3132 } 3133 3134 static int raw_cmd_ioctl(int cmd, void __user *param) 3135 { 3136 struct floppy_raw_cmd *my_raw_cmd; 3137 int drive; 3138 int ret2; 3139 int ret; 3140 3141 if (fdc_state[current_fdc].rawcmd <= 1) 3142 fdc_state[current_fdc].rawcmd = 1; 3143 for (drive = 0; drive < N_DRIVE; drive++) { 3144 if (FDC(drive) != current_fdc) 3145 continue; 3146 if (drive == current_drive) { 3147 if (drive_state[drive].fd_ref > 1) { 3148 fdc_state[current_fdc].rawcmd = 2; 3149 break; 3150 } 3151 } else if (drive_state[drive].fd_ref) { 3152 fdc_state[current_fdc].rawcmd = 2; 3153 break; 3154 } 3155 } 3156 3157 if (fdc_state[current_fdc].reset) 3158 return -EIO; 3159 3160 ret = raw_cmd_copyin(cmd, param, &my_raw_cmd); 3161 if (ret) { 3162 raw_cmd_free(&my_raw_cmd); 3163 return ret; 3164 } 3165 3166 raw_cmd = my_raw_cmd; 3167 cont = &raw_cmd_cont; 3168 ret = wait_til_done(floppy_start, true); 3169 debug_dcl(drive_params[current_drive].flags, 3170 "calling disk change from raw_cmd ioctl\n"); 3171 3172 if (ret != -EINTR && fdc_state[current_fdc].reset) 3173 ret = -EIO; 3174 3175 drive_state[current_drive].track = NO_TRACK; 3176 3177 ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd); 3178 if (!ret) 3179 ret = ret2; 3180 raw_cmd_free(&my_raw_cmd); 3181 return ret; 3182 } 3183 3184 static int floppy_raw_cmd_ioctl(int type, int drive, int cmd, 3185 void __user *param) 3186 { 3187 int ret; 3188 3189 pr_warn_once("Note: FDRAWCMD is deprecated and will be removed from the kernel in the near future.\n"); 3190 3191 if (type) 3192 return -EINVAL; 3193 if (lock_fdc(drive)) 3194 return -EINTR; 3195 set_floppy(drive); 3196 ret = raw_cmd_ioctl(cmd, param); 3197 if (ret == -EINTR) 3198 return -EINTR; 3199 process_fd_request(); 3200 return ret; 3201 } 3202 3203 #else /* CONFIG_BLK_DEV_FD_RAWCMD */ 3204 3205 static int floppy_raw_cmd_ioctl(int type, int drive, int cmd, 3206 void __user *param) 3207 { 3208 return -EOPNOTSUPP; 3209 } 3210 3211 #endif 3212 3213 static int invalidate_drive(struct gendisk *disk) 3214 { 3215 /* invalidate the buffer track to force a reread */ 3216 set_bit((long)disk->private_data, &fake_change); 3217 process_fd_request(); 3218 if (disk_check_media_change(disk)) { 3219 bdev_mark_dead(disk->part0, true); 3220 floppy_revalidate(disk); 3221 } 3222 return 0; 3223 } 3224 3225 static int set_geometry(unsigned int cmd, struct floppy_struct *g, 3226 int drive, int type, struct block_device *bdev) 3227 { 3228 int cnt; 3229 3230 /* sanity checking for parameters. */ 3231 if ((int)g->sect <= 0 || 3232 (int)g->head <= 0 || 3233 /* check for overflow in max_sector */ 3234 (int)(g->sect * g->head) <= 0 || 3235 /* check for zero in raw_cmd->cmd[F_SECT_PER_TRACK] */ 3236 (unsigned char)((g->sect << 2) >> FD_SIZECODE(g)) == 0 || 3237 g->track <= 0 || g->track > drive_params[drive].tracks >> STRETCH(g) || 3238 /* check if reserved bits are set */ 3239 (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_SECTBASEMASK)) != 0) 3240 return -EINVAL; 3241 if (type) { 3242 if (!capable(CAP_SYS_ADMIN)) 3243 return -EPERM; 3244 mutex_lock(&open_lock); 3245 if (lock_fdc(drive)) { 3246 mutex_unlock(&open_lock); 3247 return -EINTR; 3248 } 3249 floppy_type[type] = *g; 3250 floppy_type[type].name = "user format"; 3251 for (cnt = type << 2; cnt < (type << 2) + 4; cnt++) 3252 floppy_sizes[cnt] = floppy_sizes[cnt + 0x80] = 3253 floppy_type[type].size + 1; 3254 process_fd_request(); 3255 for (cnt = 0; cnt < N_DRIVE; cnt++) { 3256 struct gendisk *disk = opened_disk[cnt]; 3257 3258 if (!disk || ITYPE(drive_state[cnt].fd_device) != type) 3259 continue; 3260 disk_force_media_change(disk); 3261 } 3262 mutex_unlock(&open_lock); 3263 } else { 3264 int oldStretch; 3265 3266 if (lock_fdc(drive)) 3267 return -EINTR; 3268 if (cmd != FDDEFPRM) { 3269 /* notice a disk change immediately, else 3270 * we lose our settings immediately*/ 3271 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR) 3272 return -EINTR; 3273 } 3274 oldStretch = g->stretch; 3275 user_params[drive] = *g; 3276 if (buffer_drive == drive) 3277 SUPBOUND(buffer_max, user_params[drive].sect); 3278 current_type[drive] = &user_params[drive]; 3279 floppy_sizes[drive] = user_params[drive].size; 3280 if (cmd == FDDEFPRM) 3281 drive_state[current_drive].keep_data = -1; 3282 else 3283 drive_state[current_drive].keep_data = 1; 3284 /* invalidation. Invalidate only when needed, i.e. 3285 * when there are already sectors in the buffer cache 3286 * whose number will change. This is useful, because 3287 * mtools often changes the geometry of the disk after 3288 * looking at the boot block */ 3289 if (drive_state[current_drive].maxblock > user_params[drive].sect || 3290 drive_state[current_drive].maxtrack || 3291 ((user_params[drive].sect ^ oldStretch) & 3292 (FD_SWAPSIDES | FD_SECTBASEMASK))) 3293 invalidate_drive(bdev->bd_disk); 3294 else 3295 process_fd_request(); 3296 } 3297 return 0; 3298 } 3299 3300 /* handle obsolete ioctl's */ 3301 static unsigned int ioctl_table[] = { 3302 FDCLRPRM, 3303 FDSETPRM, 3304 FDDEFPRM, 3305 FDGETPRM, 3306 FDMSGON, 3307 FDMSGOFF, 3308 FDFMTBEG, 3309 FDFMTTRK, 3310 FDFMTEND, 3311 FDSETEMSGTRESH, 3312 FDFLUSH, 3313 FDSETMAXERRS, 3314 FDGETMAXERRS, 3315 FDGETDRVTYP, 3316 FDSETDRVPRM, 3317 FDGETDRVPRM, 3318 FDGETDRVSTAT, 3319 FDPOLLDRVSTAT, 3320 FDRESET, 3321 FDGETFDCSTAT, 3322 FDWERRORCLR, 3323 FDWERRORGET, 3324 FDRAWCMD, 3325 FDEJECT, 3326 FDTWADDLE 3327 }; 3328 3329 static int normalize_ioctl(unsigned int *cmd, int *size) 3330 { 3331 int i; 3332 3333 for (i = 0; i < ARRAY_SIZE(ioctl_table); i++) { 3334 if ((*cmd & 0xffff) == (ioctl_table[i] & 0xffff)) { 3335 *size = _IOC_SIZE(*cmd); 3336 *cmd = ioctl_table[i]; 3337 if (*size > _IOC_SIZE(*cmd)) { 3338 pr_info("ioctl not yet supported\n"); 3339 return -EFAULT; 3340 } 3341 return 0; 3342 } 3343 } 3344 return -EINVAL; 3345 } 3346 3347 static int get_floppy_geometry(int drive, int type, struct floppy_struct **g) 3348 { 3349 if (type) 3350 *g = &floppy_type[type]; 3351 else { 3352 if (lock_fdc(drive)) 3353 return -EINTR; 3354 if (poll_drive(false, 0) == -EINTR) 3355 return -EINTR; 3356 process_fd_request(); 3357 *g = current_type[drive]; 3358 } 3359 if (!*g) 3360 return -ENODEV; 3361 return 0; 3362 } 3363 3364 static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 3365 { 3366 int drive = (long)bdev->bd_disk->private_data; 3367 int type = ITYPE(drive_state[drive].fd_device); 3368 struct floppy_struct *g; 3369 int ret; 3370 3371 ret = get_floppy_geometry(drive, type, &g); 3372 if (ret) 3373 return ret; 3374 3375 geo->heads = g->head; 3376 geo->sectors = g->sect; 3377 geo->cylinders = g->track; 3378 return 0; 3379 } 3380 3381 static bool valid_floppy_drive_params(const short autodetect[FD_AUTODETECT_SIZE], 3382 int native_format) 3383 { 3384 size_t floppy_type_size = ARRAY_SIZE(floppy_type); 3385 size_t i = 0; 3386 3387 for (i = 0; i < FD_AUTODETECT_SIZE; ++i) { 3388 if (autodetect[i] < 0 || 3389 autodetect[i] >= floppy_type_size) 3390 return false; 3391 } 3392 3393 if (native_format < 0 || native_format >= floppy_type_size) 3394 return false; 3395 3396 return true; 3397 } 3398 3399 static int fd_locked_ioctl(struct block_device *bdev, blk_mode_t mode, 3400 unsigned int cmd, unsigned long param) 3401 { 3402 int drive = (long)bdev->bd_disk->private_data; 3403 int type = ITYPE(drive_state[drive].fd_device); 3404 int ret; 3405 int size; 3406 union inparam { 3407 struct floppy_struct g; /* geometry */ 3408 struct format_descr f; 3409 struct floppy_max_errors max_errors; 3410 struct floppy_drive_params dp; 3411 } inparam; /* parameters coming from user space */ 3412 const void *outparam; /* parameters passed back to user space */ 3413 3414 /* convert compatibility eject ioctls into floppy eject ioctl. 3415 * We do this in order to provide a means to eject floppy disks before 3416 * installing the new fdutils package */ 3417 if (cmd == CDROMEJECT || /* CD-ROM eject */ 3418 cmd == 0x6470) { /* SunOS floppy eject */ 3419 DPRINT("obsolete eject ioctl\n"); 3420 DPRINT("please use floppycontrol --eject\n"); 3421 cmd = FDEJECT; 3422 } 3423 3424 if (!((cmd & 0xff00) == 0x0200)) 3425 return -EINVAL; 3426 3427 /* convert the old style command into a new style command */ 3428 ret = normalize_ioctl(&cmd, &size); 3429 if (ret) 3430 return ret; 3431 3432 /* permission checks */ 3433 if (((cmd & 0x40) && 3434 !(mode & (BLK_OPEN_WRITE | BLK_OPEN_WRITE_IOCTL))) || 3435 ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))) 3436 return -EPERM; 3437 3438 if (WARN_ON(size < 0 || size > sizeof(inparam))) 3439 return -EINVAL; 3440 3441 /* copyin */ 3442 memset(&inparam, 0, sizeof(inparam)); 3443 if (_IOC_DIR(cmd) & _IOC_WRITE) { 3444 ret = fd_copyin((void __user *)param, &inparam, size); 3445 if (ret) 3446 return ret; 3447 } 3448 3449 switch (cmd) { 3450 case FDEJECT: 3451 if (drive_state[drive].fd_ref != 1) 3452 /* somebody else has this drive open */ 3453 return -EBUSY; 3454 if (lock_fdc(drive)) 3455 return -EINTR; 3456 3457 /* do the actual eject. Fails on 3458 * non-Sparc architectures */ 3459 ret = fd_eject(UNIT(drive)); 3460 3461 set_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags); 3462 set_bit(FD_VERIFY_BIT, &drive_state[drive].flags); 3463 process_fd_request(); 3464 return ret; 3465 case FDCLRPRM: 3466 if (lock_fdc(drive)) 3467 return -EINTR; 3468 current_type[drive] = NULL; 3469 floppy_sizes[drive] = MAX_DISK_SIZE << 1; 3470 drive_state[drive].keep_data = 0; 3471 return invalidate_drive(bdev->bd_disk); 3472 case FDSETPRM: 3473 case FDDEFPRM: 3474 return set_geometry(cmd, &inparam.g, drive, type, bdev); 3475 case FDGETPRM: 3476 ret = get_floppy_geometry(drive, type, 3477 (struct floppy_struct **)&outparam); 3478 if (ret) 3479 return ret; 3480 memcpy(&inparam.g, outparam, 3481 offsetof(struct floppy_struct, name)); 3482 outparam = &inparam.g; 3483 break; 3484 case FDMSGON: 3485 drive_params[drive].flags |= FTD_MSG; 3486 return 0; 3487 case FDMSGOFF: 3488 drive_params[drive].flags &= ~FTD_MSG; 3489 return 0; 3490 case FDFMTBEG: 3491 if (lock_fdc(drive)) 3492 return -EINTR; 3493 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR) 3494 return -EINTR; 3495 ret = drive_state[drive].flags; 3496 process_fd_request(); 3497 if (ret & FD_VERIFY) 3498 return -ENODEV; 3499 if (!(ret & FD_DISK_WRITABLE)) 3500 return -EROFS; 3501 return 0; 3502 case FDFMTTRK: 3503 if (drive_state[drive].fd_ref != 1) 3504 return -EBUSY; 3505 return do_format(drive, &inparam.f); 3506 case FDFMTEND: 3507 case FDFLUSH: 3508 if (lock_fdc(drive)) 3509 return -EINTR; 3510 return invalidate_drive(bdev->bd_disk); 3511 case FDSETEMSGTRESH: 3512 drive_params[drive].max_errors.reporting = (unsigned short)(param & 0x0f); 3513 return 0; 3514 case FDGETMAXERRS: 3515 outparam = &drive_params[drive].max_errors; 3516 break; 3517 case FDSETMAXERRS: 3518 drive_params[drive].max_errors = inparam.max_errors; 3519 break; 3520 case FDGETDRVTYP: 3521 outparam = drive_name(type, drive); 3522 SUPBOUND(size, strlen((const char *)outparam) + 1); 3523 break; 3524 case FDSETDRVPRM: 3525 if (!valid_floppy_drive_params(inparam.dp.autodetect, 3526 inparam.dp.native_format)) 3527 return -EINVAL; 3528 drive_params[drive] = inparam.dp; 3529 break; 3530 case FDGETDRVPRM: 3531 outparam = &drive_params[drive]; 3532 break; 3533 case FDPOLLDRVSTAT: 3534 if (lock_fdc(drive)) 3535 return -EINTR; 3536 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR) 3537 return -EINTR; 3538 process_fd_request(); 3539 fallthrough; 3540 case FDGETDRVSTAT: 3541 outparam = &drive_state[drive]; 3542 break; 3543 case FDRESET: 3544 return user_reset_fdc(drive, (int)param, true); 3545 case FDGETFDCSTAT: 3546 outparam = &fdc_state[FDC(drive)]; 3547 break; 3548 case FDWERRORCLR: 3549 memset(&write_errors[drive], 0, sizeof(write_errors[drive])); 3550 return 0; 3551 case FDWERRORGET: 3552 outparam = &write_errors[drive]; 3553 break; 3554 case FDRAWCMD: 3555 return floppy_raw_cmd_ioctl(type, drive, cmd, (void __user *)param); 3556 case FDTWADDLE: 3557 if (lock_fdc(drive)) 3558 return -EINTR; 3559 twaddle(current_fdc, current_drive); 3560 process_fd_request(); 3561 return 0; 3562 default: 3563 return -EINVAL; 3564 } 3565 3566 if (_IOC_DIR(cmd) & _IOC_READ) 3567 return fd_copyout((void __user *)param, outparam, size); 3568 3569 return 0; 3570 } 3571 3572 static int fd_ioctl(struct block_device *bdev, blk_mode_t mode, 3573 unsigned int cmd, unsigned long param) 3574 { 3575 int ret; 3576 3577 mutex_lock(&floppy_mutex); 3578 ret = fd_locked_ioctl(bdev, mode, cmd, param); 3579 mutex_unlock(&floppy_mutex); 3580 3581 return ret; 3582 } 3583 3584 #ifdef CONFIG_COMPAT 3585 3586 struct compat_floppy_drive_params { 3587 char cmos; 3588 compat_ulong_t max_dtr; 3589 compat_ulong_t hlt; 3590 compat_ulong_t hut; 3591 compat_ulong_t srt; 3592 compat_ulong_t spinup; 3593 compat_ulong_t spindown; 3594 unsigned char spindown_offset; 3595 unsigned char select_delay; 3596 unsigned char rps; 3597 unsigned char tracks; 3598 compat_ulong_t timeout; 3599 unsigned char interleave_sect; 3600 struct floppy_max_errors max_errors; 3601 char flags; 3602 char read_track; 3603 short autodetect[FD_AUTODETECT_SIZE]; 3604 compat_int_t checkfreq; 3605 compat_int_t native_format; 3606 }; 3607 3608 struct compat_floppy_drive_struct { 3609 signed char flags; 3610 compat_ulong_t spinup_date; 3611 compat_ulong_t select_date; 3612 compat_ulong_t first_read_date; 3613 short probed_format; 3614 short track; 3615 short maxblock; 3616 short maxtrack; 3617 compat_int_t generation; 3618 compat_int_t keep_data; 3619 compat_int_t fd_ref; 3620 compat_int_t fd_device; 3621 compat_int_t last_checked; 3622 compat_caddr_t dmabuf; 3623 compat_int_t bufblocks; 3624 }; 3625 3626 struct compat_floppy_fdc_state { 3627 compat_int_t spec1; 3628 compat_int_t spec2; 3629 compat_int_t dtr; 3630 unsigned char version; 3631 unsigned char dor; 3632 compat_ulong_t address; 3633 unsigned int rawcmd:2; 3634 unsigned int reset:1; 3635 unsigned int need_configure:1; 3636 unsigned int perp_mode:2; 3637 unsigned int has_fifo:1; 3638 unsigned int driver_version; 3639 unsigned char track[4]; 3640 }; 3641 3642 struct compat_floppy_write_errors { 3643 unsigned int write_errors; 3644 compat_ulong_t first_error_sector; 3645 compat_int_t first_error_generation; 3646 compat_ulong_t last_error_sector; 3647 compat_int_t last_error_generation; 3648 compat_uint_t badness; 3649 }; 3650 3651 #define FDSETPRM32 _IOW(2, 0x42, struct compat_floppy_struct) 3652 #define FDDEFPRM32 _IOW(2, 0x43, struct compat_floppy_struct) 3653 #define FDSETDRVPRM32 _IOW(2, 0x90, struct compat_floppy_drive_params) 3654 #define FDGETDRVPRM32 _IOR(2, 0x11, struct compat_floppy_drive_params) 3655 #define FDGETDRVSTAT32 _IOR(2, 0x12, struct compat_floppy_drive_struct) 3656 #define FDPOLLDRVSTAT32 _IOR(2, 0x13, struct compat_floppy_drive_struct) 3657 #define FDGETFDCSTAT32 _IOR(2, 0x15, struct compat_floppy_fdc_state) 3658 #define FDWERRORGET32 _IOR(2, 0x17, struct compat_floppy_write_errors) 3659 3660 static int compat_set_geometry(struct block_device *bdev, blk_mode_t mode, 3661 unsigned int cmd, struct compat_floppy_struct __user *arg) 3662 { 3663 struct floppy_struct v; 3664 int drive, type; 3665 int err; 3666 3667 BUILD_BUG_ON(offsetof(struct floppy_struct, name) != 3668 offsetof(struct compat_floppy_struct, name)); 3669 3670 if (!(mode & (BLK_OPEN_WRITE | BLK_OPEN_WRITE_IOCTL))) 3671 return -EPERM; 3672 3673 memset(&v, 0, sizeof(struct floppy_struct)); 3674 if (copy_from_user(&v, arg, offsetof(struct floppy_struct, name))) 3675 return -EFAULT; 3676 3677 mutex_lock(&floppy_mutex); 3678 drive = (long)bdev->bd_disk->private_data; 3679 type = ITYPE(drive_state[drive].fd_device); 3680 err = set_geometry(cmd == FDSETPRM32 ? FDSETPRM : FDDEFPRM, 3681 &v, drive, type, bdev); 3682 mutex_unlock(&floppy_mutex); 3683 return err; 3684 } 3685 3686 static int compat_get_prm(int drive, 3687 struct compat_floppy_struct __user *arg) 3688 { 3689 struct compat_floppy_struct v; 3690 struct floppy_struct *p; 3691 int err; 3692 3693 memset(&v, 0, sizeof(v)); 3694 mutex_lock(&floppy_mutex); 3695 err = get_floppy_geometry(drive, ITYPE(drive_state[drive].fd_device), 3696 &p); 3697 if (err) { 3698 mutex_unlock(&floppy_mutex); 3699 return err; 3700 } 3701 memcpy(&v, p, offsetof(struct floppy_struct, name)); 3702 mutex_unlock(&floppy_mutex); 3703 if (copy_to_user(arg, &v, sizeof(struct compat_floppy_struct))) 3704 return -EFAULT; 3705 return 0; 3706 } 3707 3708 static int compat_setdrvprm(int drive, 3709 struct compat_floppy_drive_params __user *arg) 3710 { 3711 struct compat_floppy_drive_params v; 3712 3713 if (!capable(CAP_SYS_ADMIN)) 3714 return -EPERM; 3715 if (copy_from_user(&v, arg, sizeof(struct compat_floppy_drive_params))) 3716 return -EFAULT; 3717 if (!valid_floppy_drive_params(v.autodetect, v.native_format)) 3718 return -EINVAL; 3719 mutex_lock(&floppy_mutex); 3720 drive_params[drive].cmos = v.cmos; 3721 drive_params[drive].max_dtr = v.max_dtr; 3722 drive_params[drive].hlt = v.hlt; 3723 drive_params[drive].hut = v.hut; 3724 drive_params[drive].srt = v.srt; 3725 drive_params[drive].spinup = v.spinup; 3726 drive_params[drive].spindown = v.spindown; 3727 drive_params[drive].spindown_offset = v.spindown_offset; 3728 drive_params[drive].select_delay = v.select_delay; 3729 drive_params[drive].rps = v.rps; 3730 drive_params[drive].tracks = v.tracks; 3731 drive_params[drive].timeout = v.timeout; 3732 drive_params[drive].interleave_sect = v.interleave_sect; 3733 drive_params[drive].max_errors = v.max_errors; 3734 drive_params[drive].flags = v.flags; 3735 drive_params[drive].read_track = v.read_track; 3736 memcpy(drive_params[drive].autodetect, v.autodetect, 3737 sizeof(v.autodetect)); 3738 drive_params[drive].checkfreq = v.checkfreq; 3739 drive_params[drive].native_format = v.native_format; 3740 mutex_unlock(&floppy_mutex); 3741 return 0; 3742 } 3743 3744 static int compat_getdrvprm(int drive, 3745 struct compat_floppy_drive_params __user *arg) 3746 { 3747 struct compat_floppy_drive_params v; 3748 3749 memset(&v, 0, sizeof(struct compat_floppy_drive_params)); 3750 mutex_lock(&floppy_mutex); 3751 v.cmos = drive_params[drive].cmos; 3752 v.max_dtr = drive_params[drive].max_dtr; 3753 v.hlt = drive_params[drive].hlt; 3754 v.hut = drive_params[drive].hut; 3755 v.srt = drive_params[drive].srt; 3756 v.spinup = drive_params[drive].spinup; 3757 v.spindown = drive_params[drive].spindown; 3758 v.spindown_offset = drive_params[drive].spindown_offset; 3759 v.select_delay = drive_params[drive].select_delay; 3760 v.rps = drive_params[drive].rps; 3761 v.tracks = drive_params[drive].tracks; 3762 v.timeout = drive_params[drive].timeout; 3763 v.interleave_sect = drive_params[drive].interleave_sect; 3764 v.max_errors = drive_params[drive].max_errors; 3765 v.flags = drive_params[drive].flags; 3766 v.read_track = drive_params[drive].read_track; 3767 memcpy(v.autodetect, drive_params[drive].autodetect, 3768 sizeof(v.autodetect)); 3769 v.checkfreq = drive_params[drive].checkfreq; 3770 v.native_format = drive_params[drive].native_format; 3771 mutex_unlock(&floppy_mutex); 3772 3773 if (copy_to_user(arg, &v, sizeof(struct compat_floppy_drive_params))) 3774 return -EFAULT; 3775 return 0; 3776 } 3777 3778 static int compat_getdrvstat(int drive, bool poll, 3779 struct compat_floppy_drive_struct __user *arg) 3780 { 3781 struct compat_floppy_drive_struct v; 3782 3783 memset(&v, 0, sizeof(struct compat_floppy_drive_struct)); 3784 mutex_lock(&floppy_mutex); 3785 3786 if (poll) { 3787 if (lock_fdc(drive)) 3788 goto Eintr; 3789 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR) 3790 goto Eintr; 3791 process_fd_request(); 3792 } 3793 v.spinup_date = drive_state[drive].spinup_date; 3794 v.select_date = drive_state[drive].select_date; 3795 v.first_read_date = drive_state[drive].first_read_date; 3796 v.probed_format = drive_state[drive].probed_format; 3797 v.track = drive_state[drive].track; 3798 v.maxblock = drive_state[drive].maxblock; 3799 v.maxtrack = drive_state[drive].maxtrack; 3800 v.generation = drive_state[drive].generation; 3801 v.keep_data = drive_state[drive].keep_data; 3802 v.fd_ref = drive_state[drive].fd_ref; 3803 v.fd_device = drive_state[drive].fd_device; 3804 v.last_checked = drive_state[drive].last_checked; 3805 v.dmabuf = (uintptr_t) drive_state[drive].dmabuf; 3806 v.bufblocks = drive_state[drive].bufblocks; 3807 mutex_unlock(&floppy_mutex); 3808 3809 if (copy_to_user(arg, &v, sizeof(struct compat_floppy_drive_struct))) 3810 return -EFAULT; 3811 return 0; 3812 Eintr: 3813 mutex_unlock(&floppy_mutex); 3814 return -EINTR; 3815 } 3816 3817 static int compat_getfdcstat(int drive, 3818 struct compat_floppy_fdc_state __user *arg) 3819 { 3820 struct compat_floppy_fdc_state v32; 3821 struct floppy_fdc_state v; 3822 3823 mutex_lock(&floppy_mutex); 3824 v = fdc_state[FDC(drive)]; 3825 mutex_unlock(&floppy_mutex); 3826 3827 memset(&v32, 0, sizeof(struct compat_floppy_fdc_state)); 3828 v32.spec1 = v.spec1; 3829 v32.spec2 = v.spec2; 3830 v32.dtr = v.dtr; 3831 v32.version = v.version; 3832 v32.dor = v.dor; 3833 v32.address = v.address; 3834 v32.rawcmd = v.rawcmd; 3835 v32.reset = v.reset; 3836 v32.need_configure = v.need_configure; 3837 v32.perp_mode = v.perp_mode; 3838 v32.has_fifo = v.has_fifo; 3839 v32.driver_version = v.driver_version; 3840 memcpy(v32.track, v.track, 4); 3841 if (copy_to_user(arg, &v32, sizeof(struct compat_floppy_fdc_state))) 3842 return -EFAULT; 3843 return 0; 3844 } 3845 3846 static int compat_werrorget(int drive, 3847 struct compat_floppy_write_errors __user *arg) 3848 { 3849 struct compat_floppy_write_errors v32; 3850 struct floppy_write_errors v; 3851 3852 memset(&v32, 0, sizeof(struct compat_floppy_write_errors)); 3853 mutex_lock(&floppy_mutex); 3854 v = write_errors[drive]; 3855 mutex_unlock(&floppy_mutex); 3856 v32.write_errors = v.write_errors; 3857 v32.first_error_sector = v.first_error_sector; 3858 v32.first_error_generation = v.first_error_generation; 3859 v32.last_error_sector = v.last_error_sector; 3860 v32.last_error_generation = v.last_error_generation; 3861 v32.badness = v.badness; 3862 if (copy_to_user(arg, &v32, sizeof(struct compat_floppy_write_errors))) 3863 return -EFAULT; 3864 return 0; 3865 } 3866 3867 static int fd_compat_ioctl(struct block_device *bdev, blk_mode_t mode, 3868 unsigned int cmd, unsigned long param) 3869 { 3870 int drive = (long)bdev->bd_disk->private_data; 3871 switch (cmd) { 3872 case CDROMEJECT: /* CD-ROM eject */ 3873 case 0x6470: /* SunOS floppy eject */ 3874 3875 case FDMSGON: 3876 case FDMSGOFF: 3877 case FDSETEMSGTRESH: 3878 case FDFLUSH: 3879 case FDWERRORCLR: 3880 case FDEJECT: 3881 case FDCLRPRM: 3882 case FDFMTBEG: 3883 case FDRESET: 3884 case FDTWADDLE: 3885 return fd_ioctl(bdev, mode, cmd, param); 3886 case FDSETMAXERRS: 3887 case FDGETMAXERRS: 3888 case FDGETDRVTYP: 3889 case FDFMTEND: 3890 case FDFMTTRK: 3891 case FDRAWCMD: 3892 return fd_ioctl(bdev, mode, cmd, 3893 (unsigned long)compat_ptr(param)); 3894 case FDSETPRM32: 3895 case FDDEFPRM32: 3896 return compat_set_geometry(bdev, mode, cmd, compat_ptr(param)); 3897 case FDGETPRM32: 3898 return compat_get_prm(drive, compat_ptr(param)); 3899 case FDSETDRVPRM32: 3900 return compat_setdrvprm(drive, compat_ptr(param)); 3901 case FDGETDRVPRM32: 3902 return compat_getdrvprm(drive, compat_ptr(param)); 3903 case FDPOLLDRVSTAT32: 3904 return compat_getdrvstat(drive, true, compat_ptr(param)); 3905 case FDGETDRVSTAT32: 3906 return compat_getdrvstat(drive, false, compat_ptr(param)); 3907 case FDGETFDCSTAT32: 3908 return compat_getfdcstat(drive, compat_ptr(param)); 3909 case FDWERRORGET32: 3910 return compat_werrorget(drive, compat_ptr(param)); 3911 } 3912 return -EINVAL; 3913 } 3914 #endif 3915 3916 static void __init config_types(void) 3917 { 3918 bool has_drive = false; 3919 int drive; 3920 3921 /* read drive info out of physical CMOS */ 3922 drive = 0; 3923 if (!drive_params[drive].cmos) 3924 drive_params[drive].cmos = FLOPPY0_TYPE; 3925 drive = 1; 3926 if (!drive_params[drive].cmos) 3927 drive_params[drive].cmos = FLOPPY1_TYPE; 3928 3929 /* FIXME: additional physical CMOS drive detection should go here */ 3930 3931 for (drive = 0; drive < N_DRIVE; drive++) { 3932 unsigned int type = drive_params[drive].cmos; 3933 struct floppy_drive_params *params; 3934 const char *name = NULL; 3935 char temparea[32]; 3936 3937 if (type < ARRAY_SIZE(default_drive_params)) { 3938 params = &default_drive_params[type].params; 3939 if (type) { 3940 name = default_drive_params[type].name; 3941 allowed_drive_mask |= 1 << drive; 3942 } else 3943 allowed_drive_mask &= ~(1 << drive); 3944 } else { 3945 params = &default_drive_params[0].params; 3946 snprintf(temparea, sizeof(temparea), 3947 "unknown type %d (usb?)", type); 3948 name = temparea; 3949 } 3950 if (name) { 3951 const char *prepend; 3952 if (!has_drive) { 3953 prepend = ""; 3954 has_drive = true; 3955 pr_info("Floppy drive(s):"); 3956 } else { 3957 prepend = ","; 3958 } 3959 3960 pr_cont("%s fd%d is %s", prepend, drive, name); 3961 } 3962 drive_params[drive] = *params; 3963 } 3964 3965 if (has_drive) 3966 pr_cont("\n"); 3967 } 3968 3969 static void floppy_release(struct gendisk *disk) 3970 { 3971 int drive = (long)disk->private_data; 3972 3973 mutex_lock(&floppy_mutex); 3974 mutex_lock(&open_lock); 3975 if (!drive_state[drive].fd_ref--) { 3976 DPRINT("floppy_release with fd_ref == 0"); 3977 drive_state[drive].fd_ref = 0; 3978 } 3979 if (!drive_state[drive].fd_ref) 3980 opened_disk[drive] = NULL; 3981 mutex_unlock(&open_lock); 3982 mutex_unlock(&floppy_mutex); 3983 } 3984 3985 /* 3986 * floppy_open check for aliasing (/dev/fd0 can be the same as 3987 * /dev/PS0 etc), and disallows simultaneous access to the same 3988 * drive with different device numbers. 3989 */ 3990 static int floppy_open(struct gendisk *disk, blk_mode_t mode) 3991 { 3992 int drive = (long)disk->private_data; 3993 int old_dev, new_dev; 3994 int try; 3995 int res = -EBUSY; 3996 char *tmp; 3997 3998 mutex_lock(&floppy_mutex); 3999 mutex_lock(&open_lock); 4000 old_dev = drive_state[drive].fd_device; 4001 if (opened_disk[drive] && opened_disk[drive] != disk) 4002 goto out2; 4003 4004 if (!drive_state[drive].fd_ref && (drive_params[drive].flags & FD_BROKEN_DCL)) { 4005 set_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags); 4006 set_bit(FD_VERIFY_BIT, &drive_state[drive].flags); 4007 } 4008 4009 drive_state[drive].fd_ref++; 4010 4011 opened_disk[drive] = disk; 4012 4013 res = -ENXIO; 4014 4015 if (!floppy_track_buffer) { 4016 /* if opening an ED drive, reserve a big buffer, 4017 * else reserve a small one */ 4018 if ((drive_params[drive].cmos == 6) || (drive_params[drive].cmos == 5)) 4019 try = 64; /* Only 48 actually useful */ 4020 else 4021 try = 32; /* Only 24 actually useful */ 4022 4023 tmp = (char *)fd_dma_mem_alloc(1024 * try); 4024 if (!tmp && !floppy_track_buffer) { 4025 try >>= 1; /* buffer only one side */ 4026 INFBOUND(try, 16); 4027 tmp = (char *)fd_dma_mem_alloc(1024 * try); 4028 } 4029 if (!tmp && !floppy_track_buffer) 4030 fallback_on_nodma_alloc(&tmp, 2048 * try); 4031 if (!tmp && !floppy_track_buffer) { 4032 DPRINT("Unable to allocate DMA memory\n"); 4033 goto out; 4034 } 4035 if (floppy_track_buffer) { 4036 if (tmp) 4037 fd_dma_mem_free((unsigned long)tmp, try * 1024); 4038 } else { 4039 buffer_min = buffer_max = -1; 4040 floppy_track_buffer = tmp; 4041 max_buffer_sectors = try; 4042 } 4043 } 4044 4045 new_dev = disk->first_minor; 4046 drive_state[drive].fd_device = new_dev; 4047 set_capacity(disks[drive][ITYPE(new_dev)], floppy_sizes[new_dev]); 4048 if (old_dev != -1 && old_dev != new_dev) { 4049 if (buffer_drive == drive) 4050 buffer_track = -1; 4051 } 4052 4053 if (fdc_state[FDC(drive)].rawcmd == 1) 4054 fdc_state[FDC(drive)].rawcmd = 2; 4055 if (!(mode & BLK_OPEN_NDELAY)) { 4056 if (mode & (BLK_OPEN_READ | BLK_OPEN_WRITE)) { 4057 drive_state[drive].last_checked = 0; 4058 clear_bit(FD_OPEN_SHOULD_FAIL_BIT, 4059 &drive_state[drive].flags); 4060 if (disk_check_media_change(disk)) 4061 floppy_revalidate(disk); 4062 if (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags)) 4063 goto out; 4064 if (test_bit(FD_OPEN_SHOULD_FAIL_BIT, &drive_state[drive].flags)) 4065 goto out; 4066 } 4067 res = -EROFS; 4068 if ((mode & BLK_OPEN_WRITE) && 4069 !test_bit(FD_DISK_WRITABLE_BIT, &drive_state[drive].flags)) 4070 goto out; 4071 } 4072 mutex_unlock(&open_lock); 4073 mutex_unlock(&floppy_mutex); 4074 return 0; 4075 out: 4076 drive_state[drive].fd_ref--; 4077 4078 if (!drive_state[drive].fd_ref) 4079 opened_disk[drive] = NULL; 4080 out2: 4081 mutex_unlock(&open_lock); 4082 mutex_unlock(&floppy_mutex); 4083 return res; 4084 } 4085 4086 /* 4087 * Check if the disk has been changed or if a change has been faked. 4088 */ 4089 static unsigned int floppy_check_events(struct gendisk *disk, 4090 unsigned int clearing) 4091 { 4092 int drive = (long)disk->private_data; 4093 4094 if (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags) || 4095 test_bit(FD_VERIFY_BIT, &drive_state[drive].flags)) 4096 return DISK_EVENT_MEDIA_CHANGE; 4097 4098 if (time_after(jiffies, drive_state[drive].last_checked + drive_params[drive].checkfreq)) { 4099 if (lock_fdc(drive)) 4100 return 0; 4101 poll_drive(false, 0); 4102 process_fd_request(); 4103 } 4104 4105 if (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags) || 4106 test_bit(FD_VERIFY_BIT, &drive_state[drive].flags) || 4107 test_bit(drive, &fake_change) || 4108 drive_no_geom(drive)) 4109 return DISK_EVENT_MEDIA_CHANGE; 4110 return 0; 4111 } 4112 4113 /* 4114 * This implements "read block 0" for floppy_revalidate(). 4115 * Needed for format autodetection, checking whether there is 4116 * a disk in the drive, and whether that disk is writable. 4117 */ 4118 4119 struct rb0_cbdata { 4120 int drive; 4121 struct completion complete; 4122 }; 4123 4124 static void floppy_rb0_cb(struct bio *bio) 4125 { 4126 struct rb0_cbdata *cbdata = (struct rb0_cbdata *)bio->bi_private; 4127 int drive = cbdata->drive; 4128 4129 if (bio->bi_status) { 4130 pr_info("floppy: error %d while reading block 0\n", 4131 bio->bi_status); 4132 set_bit(FD_OPEN_SHOULD_FAIL_BIT, &drive_state[drive].flags); 4133 } 4134 complete(&cbdata->complete); 4135 } 4136 4137 static int __floppy_read_block_0(struct block_device *bdev, int drive) 4138 { 4139 struct bio bio; 4140 struct bio_vec bio_vec; 4141 struct page *page; 4142 struct rb0_cbdata cbdata; 4143 4144 page = alloc_page(GFP_NOIO); 4145 if (!page) { 4146 process_fd_request(); 4147 return -ENOMEM; 4148 } 4149 4150 cbdata.drive = drive; 4151 4152 bio_init(&bio, bdev, &bio_vec, 1, REQ_OP_READ); 4153 __bio_add_page(&bio, page, block_size(bdev), 0); 4154 4155 bio.bi_iter.bi_sector = 0; 4156 bio.bi_flags |= (1 << BIO_QUIET); 4157 bio.bi_private = &cbdata; 4158 bio.bi_end_io = floppy_rb0_cb; 4159 4160 init_completion(&cbdata.complete); 4161 4162 submit_bio(&bio); 4163 process_fd_request(); 4164 4165 wait_for_completion(&cbdata.complete); 4166 4167 __free_page(page); 4168 4169 return 0; 4170 } 4171 4172 /* revalidate the floppy disk, i.e. trigger format autodetection by reading 4173 * the bootblock (block 0). "Autodetection" is also needed to check whether 4174 * there is a disk in the drive at all... Thus we also do it for fixed 4175 * geometry formats */ 4176 static int floppy_revalidate(struct gendisk *disk) 4177 { 4178 int drive = (long)disk->private_data; 4179 int cf; 4180 int res = 0; 4181 4182 if (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags) || 4183 test_bit(FD_VERIFY_BIT, &drive_state[drive].flags) || 4184 test_bit(drive, &fake_change) || 4185 drive_no_geom(drive)) { 4186 if (WARN(atomic_read(&usage_count) == 0, 4187 "VFS: revalidate called on non-open device.\n")) 4188 return -EFAULT; 4189 4190 res = lock_fdc(drive); 4191 if (res) 4192 return res; 4193 cf = (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags) || 4194 test_bit(FD_VERIFY_BIT, &drive_state[drive].flags)); 4195 if (!(cf || test_bit(drive, &fake_change) || drive_no_geom(drive))) { 4196 process_fd_request(); /*already done by another thread */ 4197 return 0; 4198 } 4199 drive_state[drive].maxblock = 0; 4200 drive_state[drive].maxtrack = 0; 4201 if (buffer_drive == drive) 4202 buffer_track = -1; 4203 clear_bit(drive, &fake_change); 4204 clear_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags); 4205 if (cf) 4206 drive_state[drive].generation++; 4207 if (drive_no_geom(drive)) { 4208 /* auto-sensing */ 4209 res = __floppy_read_block_0(opened_disk[drive]->part0, 4210 drive); 4211 } else { 4212 if (cf) 4213 poll_drive(false, FD_RAW_NEED_DISK); 4214 process_fd_request(); 4215 } 4216 } 4217 set_capacity(disk, floppy_sizes[drive_state[drive].fd_device]); 4218 return res; 4219 } 4220 4221 static const struct block_device_operations floppy_fops = { 4222 .owner = THIS_MODULE, 4223 .open = floppy_open, 4224 .release = floppy_release, 4225 .ioctl = fd_ioctl, 4226 .getgeo = fd_getgeo, 4227 .check_events = floppy_check_events, 4228 #ifdef CONFIG_COMPAT 4229 .compat_ioctl = fd_compat_ioctl, 4230 #endif 4231 }; 4232 4233 /* 4234 * Floppy Driver initialization 4235 * ============================= 4236 */ 4237 4238 /* Determine the floppy disk controller type */ 4239 /* This routine was written by David C. Niemi */ 4240 static char __init get_fdc_version(int fdc) 4241 { 4242 int r; 4243 4244 output_byte(fdc, FD_DUMPREGS); /* 82072 and better know DUMPREGS */ 4245 if (fdc_state[fdc].reset) 4246 return FDC_NONE; 4247 r = result(fdc); 4248 if (r <= 0x00) 4249 return FDC_NONE; /* No FDC present ??? */ 4250 if ((r == 1) && (reply_buffer[ST0] == 0x80)) { 4251 pr_info("FDC %d is an 8272A\n", fdc); 4252 return FDC_8272A; /* 8272a/765 don't know DUMPREGS */ 4253 } 4254 if (r != 10) { 4255 pr_info("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n", 4256 fdc, r); 4257 return FDC_UNKNOWN; 4258 } 4259 4260 if (!fdc_configure(fdc)) { 4261 pr_info("FDC %d is an 82072\n", fdc); 4262 return FDC_82072; /* 82072 doesn't know CONFIGURE */ 4263 } 4264 4265 output_byte(fdc, FD_PERPENDICULAR); 4266 if (need_more_output(fdc) == MORE_OUTPUT) { 4267 output_byte(fdc, 0); 4268 } else { 4269 pr_info("FDC %d is an 82072A\n", fdc); 4270 return FDC_82072A; /* 82072A as found on Sparcs. */ 4271 } 4272 4273 output_byte(fdc, FD_UNLOCK); 4274 r = result(fdc); 4275 if ((r == 1) && (reply_buffer[ST0] == 0x80)) { 4276 pr_info("FDC %d is a pre-1991 82077\n", fdc); 4277 return FDC_82077_ORIG; /* Pre-1991 82077, doesn't know 4278 * LOCK/UNLOCK */ 4279 } 4280 if ((r != 1) || (reply_buffer[ST0] != 0x00)) { 4281 pr_info("FDC %d init: UNLOCK: unexpected return of %d bytes.\n", 4282 fdc, r); 4283 return FDC_UNKNOWN; 4284 } 4285 output_byte(fdc, FD_PARTID); 4286 r = result(fdc); 4287 if (r != 1) { 4288 pr_info("FDC %d init: PARTID: unexpected return of %d bytes.\n", 4289 fdc, r); 4290 return FDC_UNKNOWN; 4291 } 4292 if (reply_buffer[ST0] == 0x80) { 4293 pr_info("FDC %d is a post-1991 82077\n", fdc); 4294 return FDC_82077; /* Revised 82077AA passes all the tests */ 4295 } 4296 switch (reply_buffer[ST0] >> 5) { 4297 case 0x0: 4298 /* Either a 82078-1 or a 82078SL running at 5Volt */ 4299 pr_info("FDC %d is an 82078.\n", fdc); 4300 return FDC_82078; 4301 case 0x1: 4302 pr_info("FDC %d is a 44pin 82078\n", fdc); 4303 return FDC_82078; 4304 case 0x2: 4305 pr_info("FDC %d is a S82078B\n", fdc); 4306 return FDC_S82078B; 4307 case 0x3: 4308 pr_info("FDC %d is a National Semiconductor PC87306\n", fdc); 4309 return FDC_87306; 4310 default: 4311 pr_info("FDC %d init: 82078 variant with unknown PARTID=%d.\n", 4312 fdc, reply_buffer[ST0] >> 5); 4313 return FDC_82078_UNKN; 4314 } 4315 } /* get_fdc_version */ 4316 4317 /* lilo configuration */ 4318 4319 static void __init floppy_set_flags(int *ints, int param, int param2) 4320 { 4321 int i; 4322 4323 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) { 4324 if (param) 4325 default_drive_params[i].params.flags |= param2; 4326 else 4327 default_drive_params[i].params.flags &= ~param2; 4328 } 4329 DPRINT("%s flag 0x%x\n", param2 ? "Setting" : "Clearing", param); 4330 } 4331 4332 static void __init daring(int *ints, int param, int param2) 4333 { 4334 int i; 4335 4336 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) { 4337 if (param) { 4338 default_drive_params[i].params.select_delay = 0; 4339 default_drive_params[i].params.flags |= 4340 FD_SILENT_DCL_CLEAR; 4341 } else { 4342 default_drive_params[i].params.select_delay = 4343 2 * HZ / 100; 4344 default_drive_params[i].params.flags &= 4345 ~FD_SILENT_DCL_CLEAR; 4346 } 4347 } 4348 DPRINT("Assuming %s floppy hardware\n", param ? "standard" : "broken"); 4349 } 4350 4351 static void __init set_cmos(int *ints, int dummy, int dummy2) 4352 { 4353 int current_drive = 0; 4354 4355 if (ints[0] != 2) { 4356 DPRINT("wrong number of parameters for CMOS\n"); 4357 return; 4358 } 4359 current_drive = ints[1]; 4360 if (current_drive < 0 || current_drive >= 8) { 4361 DPRINT("bad drive for set_cmos\n"); 4362 return; 4363 } 4364 #if N_FDC > 1 4365 if (current_drive >= 4 && !FDC2) 4366 FDC2 = 0x370; 4367 #endif 4368 drive_params[current_drive].cmos = ints[2]; 4369 DPRINT("setting CMOS code to %d\n", ints[2]); 4370 } 4371 4372 static struct param_table { 4373 const char *name; 4374 void (*fn) (int *ints, int param, int param2); 4375 int *var; 4376 int def_param; 4377 int param2; 4378 } config_params[] __initdata = { 4379 {"allowed_drive_mask", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */ 4380 {"all_drives", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */ 4381 {"asus_pci", NULL, &allowed_drive_mask, 0x33, 0}, 4382 {"irq", NULL, &FLOPPY_IRQ, 6, 0}, 4383 {"dma", NULL, &FLOPPY_DMA, 2, 0}, 4384 {"daring", daring, NULL, 1, 0}, 4385 #if N_FDC > 1 4386 {"two_fdc", NULL, &FDC2, 0x370, 0}, 4387 {"one_fdc", NULL, &FDC2, 0, 0}, 4388 #endif 4389 {"thinkpad", floppy_set_flags, NULL, 1, FD_INVERTED_DCL}, 4390 {"broken_dcl", floppy_set_flags, NULL, 1, FD_BROKEN_DCL}, 4391 {"messages", floppy_set_flags, NULL, 1, FTD_MSG}, 4392 {"silent_dcl_clear", floppy_set_flags, NULL, 1, FD_SILENT_DCL_CLEAR}, 4393 {"debug", floppy_set_flags, NULL, 1, FD_DEBUG}, 4394 {"nodma", NULL, &can_use_virtual_dma, 1, 0}, 4395 {"omnibook", NULL, &can_use_virtual_dma, 1, 0}, 4396 {"yesdma", NULL, &can_use_virtual_dma, 0, 0}, 4397 {"fifo_depth", NULL, &fifo_depth, 0xa, 0}, 4398 {"nofifo", NULL, &no_fifo, 0x20, 0}, 4399 {"usefifo", NULL, &no_fifo, 0, 0}, 4400 {"cmos", set_cmos, NULL, 0, 0}, 4401 {"slow", NULL, &slow_floppy, 1, 0}, 4402 {"unexpected_interrupts", NULL, &print_unex, 1, 0}, 4403 {"no_unexpected_interrupts", NULL, &print_unex, 0, 0}, 4404 {"L40SX", NULL, &print_unex, 0, 0} 4405 4406 EXTRA_FLOPPY_PARAMS 4407 }; 4408 4409 static int __init floppy_setup(char *str) 4410 { 4411 int i; 4412 int param; 4413 int ints[11]; 4414 4415 str = get_options(str, ARRAY_SIZE(ints), ints); 4416 if (str) { 4417 for (i = 0; i < ARRAY_SIZE(config_params); i++) { 4418 if (strcmp(str, config_params[i].name) == 0) { 4419 if (ints[0]) 4420 param = ints[1]; 4421 else 4422 param = config_params[i].def_param; 4423 if (config_params[i].fn) 4424 config_params[i].fn(ints, param, 4425 config_params[i]. 4426 param2); 4427 if (config_params[i].var) { 4428 DPRINT("%s=%d\n", str, param); 4429 *config_params[i].var = param; 4430 } 4431 return 1; 4432 } 4433 } 4434 } 4435 if (str) { 4436 DPRINT("unknown floppy option [%s]\n", str); 4437 4438 DPRINT("allowed options are:"); 4439 for (i = 0; i < ARRAY_SIZE(config_params); i++) 4440 pr_cont(" %s", config_params[i].name); 4441 pr_cont("\n"); 4442 } else 4443 DPRINT("botched floppy option\n"); 4444 DPRINT("Read Documentation/admin-guide/blockdev/floppy.rst\n"); 4445 return 0; 4446 } 4447 4448 static int have_no_fdc = -ENODEV; 4449 4450 static ssize_t floppy_cmos_show(struct device *dev, 4451 struct device_attribute *attr, char *buf) 4452 { 4453 struct platform_device *p = to_platform_device(dev); 4454 int drive; 4455 4456 drive = p->id; 4457 return sprintf(buf, "%X\n", drive_params[drive].cmos); 4458 } 4459 4460 static DEVICE_ATTR(cmos, 0444, floppy_cmos_show, NULL); 4461 4462 static struct attribute *floppy_dev_attrs[] = { 4463 &dev_attr_cmos.attr, 4464 NULL 4465 }; 4466 4467 ATTRIBUTE_GROUPS(floppy_dev); 4468 4469 static void floppy_device_release(struct device *dev) 4470 { 4471 } 4472 4473 static int floppy_resume(struct device *dev) 4474 { 4475 int fdc; 4476 int saved_drive; 4477 4478 saved_drive = current_drive; 4479 for (fdc = 0; fdc < N_FDC; fdc++) 4480 if (fdc_state[fdc].address != -1) 4481 user_reset_fdc(REVDRIVE(fdc, 0), FD_RESET_ALWAYS, false); 4482 set_fdc(saved_drive); 4483 return 0; 4484 } 4485 4486 static const struct dev_pm_ops floppy_pm_ops = { 4487 .resume = floppy_resume, 4488 .restore = floppy_resume, 4489 }; 4490 4491 static struct platform_driver floppy_driver = { 4492 .driver = { 4493 .name = "floppy", 4494 .pm = &floppy_pm_ops, 4495 }, 4496 }; 4497 4498 static const struct blk_mq_ops floppy_mq_ops = { 4499 .queue_rq = floppy_queue_rq, 4500 }; 4501 4502 static struct platform_device floppy_device[N_DRIVE]; 4503 static bool registered[N_DRIVE]; 4504 4505 static bool floppy_available(int drive) 4506 { 4507 if (!(allowed_drive_mask & (1 << drive))) 4508 return false; 4509 if (fdc_state[FDC(drive)].version == FDC_NONE) 4510 return false; 4511 return true; 4512 } 4513 4514 static int floppy_alloc_disk(unsigned int drive, unsigned int type) 4515 { 4516 struct gendisk *disk; 4517 4518 disk = blk_mq_alloc_disk(&tag_sets[drive], NULL); 4519 if (IS_ERR(disk)) 4520 return PTR_ERR(disk); 4521 4522 blk_queue_max_hw_sectors(disk->queue, 64); 4523 disk->major = FLOPPY_MAJOR; 4524 disk->first_minor = TOMINOR(drive) | (type << 2); 4525 disk->minors = 1; 4526 disk->fops = &floppy_fops; 4527 disk->flags |= GENHD_FL_NO_PART; 4528 disk->events = DISK_EVENT_MEDIA_CHANGE; 4529 if (type) 4530 sprintf(disk->disk_name, "fd%d_type%d", drive, type); 4531 else 4532 sprintf(disk->disk_name, "fd%d", drive); 4533 /* to be cleaned up... */ 4534 disk->private_data = (void *)(long)drive; 4535 disk->flags |= GENHD_FL_REMOVABLE; 4536 4537 disks[drive][type] = disk; 4538 return 0; 4539 } 4540 4541 static DEFINE_MUTEX(floppy_probe_lock); 4542 4543 static void floppy_probe(dev_t dev) 4544 { 4545 unsigned int drive = (MINOR(dev) & 3) | ((MINOR(dev) & 0x80) >> 5); 4546 unsigned int type = (MINOR(dev) >> 2) & 0x1f; 4547 4548 if (drive >= N_DRIVE || !floppy_available(drive) || 4549 type >= ARRAY_SIZE(floppy_type)) 4550 return; 4551 4552 mutex_lock(&floppy_probe_lock); 4553 if (disks[drive][type]) 4554 goto out; 4555 if (floppy_alloc_disk(drive, type)) 4556 goto out; 4557 if (add_disk(disks[drive][type])) 4558 goto cleanup_disk; 4559 out: 4560 mutex_unlock(&floppy_probe_lock); 4561 return; 4562 4563 cleanup_disk: 4564 put_disk(disks[drive][type]); 4565 disks[drive][type] = NULL; 4566 mutex_unlock(&floppy_probe_lock); 4567 } 4568 4569 static int __init do_floppy_init(void) 4570 { 4571 int i, unit, drive, err; 4572 4573 set_debugt(); 4574 interruptjiffies = resultjiffies = jiffies; 4575 4576 #if defined(CONFIG_PPC) 4577 if (check_legacy_ioport(FDC1)) 4578 return -ENODEV; 4579 #endif 4580 4581 raw_cmd = NULL; 4582 4583 floppy_wq = alloc_ordered_workqueue("floppy", 0); 4584 if (!floppy_wq) 4585 return -ENOMEM; 4586 4587 for (drive = 0; drive < N_DRIVE; drive++) { 4588 memset(&tag_sets[drive], 0, sizeof(tag_sets[drive])); 4589 tag_sets[drive].ops = &floppy_mq_ops; 4590 tag_sets[drive].nr_hw_queues = 1; 4591 tag_sets[drive].nr_maps = 1; 4592 tag_sets[drive].queue_depth = 2; 4593 tag_sets[drive].numa_node = NUMA_NO_NODE; 4594 tag_sets[drive].flags = BLK_MQ_F_SHOULD_MERGE; 4595 err = blk_mq_alloc_tag_set(&tag_sets[drive]); 4596 if (err) 4597 goto out_put_disk; 4598 4599 err = floppy_alloc_disk(drive, 0); 4600 if (err) { 4601 blk_mq_free_tag_set(&tag_sets[drive]); 4602 goto out_put_disk; 4603 } 4604 4605 timer_setup(&motor_off_timer[drive], motor_off_callback, 0); 4606 } 4607 4608 err = __register_blkdev(FLOPPY_MAJOR, "fd", floppy_probe); 4609 if (err) 4610 goto out_put_disk; 4611 4612 err = platform_driver_register(&floppy_driver); 4613 if (err) 4614 goto out_unreg_blkdev; 4615 4616 for (i = 0; i < 256; i++) 4617 if (ITYPE(i)) 4618 floppy_sizes[i] = floppy_type[ITYPE(i)].size; 4619 else 4620 floppy_sizes[i] = MAX_DISK_SIZE << 1; 4621 4622 reschedule_timeout(MAXTIMEOUT, "floppy init"); 4623 config_types(); 4624 4625 for (i = 0; i < N_FDC; i++) { 4626 memset(&fdc_state[i], 0, sizeof(*fdc_state)); 4627 fdc_state[i].dtr = -1; 4628 fdc_state[i].dor = 0x4; 4629 #if defined(__sparc__) || defined(__mc68000__) 4630 /*sparcs/sun3x don't have a DOR reset which we can fall back on to */ 4631 #ifdef __mc68000__ 4632 if (MACH_IS_SUN3X) 4633 #endif 4634 fdc_state[i].version = FDC_82072A; 4635 #endif 4636 } 4637 4638 use_virtual_dma = can_use_virtual_dma & 1; 4639 fdc_state[0].address = FDC1; 4640 if (fdc_state[0].address == -1) { 4641 cancel_delayed_work(&fd_timeout); 4642 err = -ENODEV; 4643 goto out_unreg_driver; 4644 } 4645 #if N_FDC > 1 4646 fdc_state[1].address = FDC2; 4647 #endif 4648 4649 current_fdc = 0; /* reset fdc in case of unexpected interrupt */ 4650 err = floppy_grab_irq_and_dma(); 4651 if (err) { 4652 cancel_delayed_work(&fd_timeout); 4653 err = -EBUSY; 4654 goto out_unreg_driver; 4655 } 4656 4657 /* initialise drive state */ 4658 for (drive = 0; drive < N_DRIVE; drive++) { 4659 memset(&drive_state[drive], 0, sizeof(drive_state[drive])); 4660 memset(&write_errors[drive], 0, sizeof(write_errors[drive])); 4661 set_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[drive].flags); 4662 set_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags); 4663 set_bit(FD_VERIFY_BIT, &drive_state[drive].flags); 4664 drive_state[drive].fd_device = -1; 4665 floppy_track_buffer = NULL; 4666 max_buffer_sectors = 0; 4667 } 4668 /* 4669 * Small 10 msec delay to let through any interrupt that 4670 * initialization might have triggered, to not 4671 * confuse detection: 4672 */ 4673 msleep(10); 4674 4675 for (i = 0; i < N_FDC; i++) { 4676 fdc_state[i].driver_version = FD_DRIVER_VERSION; 4677 for (unit = 0; unit < 4; unit++) 4678 fdc_state[i].track[unit] = 0; 4679 if (fdc_state[i].address == -1) 4680 continue; 4681 fdc_state[i].rawcmd = 2; 4682 if (user_reset_fdc(REVDRIVE(i, 0), FD_RESET_ALWAYS, false)) { 4683 /* free ioports reserved by floppy_grab_irq_and_dma() */ 4684 floppy_release_regions(i); 4685 fdc_state[i].address = -1; 4686 fdc_state[i].version = FDC_NONE; 4687 continue; 4688 } 4689 /* Try to determine the floppy controller type */ 4690 fdc_state[i].version = get_fdc_version(i); 4691 if (fdc_state[i].version == FDC_NONE) { 4692 /* free ioports reserved by floppy_grab_irq_and_dma() */ 4693 floppy_release_regions(i); 4694 fdc_state[i].address = -1; 4695 continue; 4696 } 4697 if (can_use_virtual_dma == 2 && 4698 fdc_state[i].version < FDC_82072A) 4699 can_use_virtual_dma = 0; 4700 4701 have_no_fdc = 0; 4702 /* Not all FDCs seem to be able to handle the version command 4703 * properly, so force a reset for the standard FDC clones, 4704 * to avoid interrupt garbage. 4705 */ 4706 user_reset_fdc(REVDRIVE(i, 0), FD_RESET_ALWAYS, false); 4707 } 4708 current_fdc = 0; 4709 cancel_delayed_work(&fd_timeout); 4710 current_drive = 0; 4711 initialized = true; 4712 if (have_no_fdc) { 4713 DPRINT("no floppy controllers found\n"); 4714 err = have_no_fdc; 4715 goto out_release_dma; 4716 } 4717 4718 for (drive = 0; drive < N_DRIVE; drive++) { 4719 if (!floppy_available(drive)) 4720 continue; 4721 4722 floppy_device[drive].name = floppy_device_name; 4723 floppy_device[drive].id = drive; 4724 floppy_device[drive].dev.release = floppy_device_release; 4725 floppy_device[drive].dev.groups = floppy_dev_groups; 4726 4727 err = platform_device_register(&floppy_device[drive]); 4728 if (err) 4729 goto out_remove_drives; 4730 4731 registered[drive] = true; 4732 4733 err = device_add_disk(&floppy_device[drive].dev, 4734 disks[drive][0], NULL); 4735 if (err) 4736 goto out_remove_drives; 4737 } 4738 4739 return 0; 4740 4741 out_remove_drives: 4742 while (drive--) { 4743 if (floppy_available(drive)) { 4744 del_gendisk(disks[drive][0]); 4745 if (registered[drive]) 4746 platform_device_unregister(&floppy_device[drive]); 4747 } 4748 } 4749 out_release_dma: 4750 if (atomic_read(&usage_count)) 4751 floppy_release_irq_and_dma(); 4752 out_unreg_driver: 4753 platform_driver_unregister(&floppy_driver); 4754 out_unreg_blkdev: 4755 unregister_blkdev(FLOPPY_MAJOR, "fd"); 4756 out_put_disk: 4757 destroy_workqueue(floppy_wq); 4758 for (drive = 0; drive < N_DRIVE; drive++) { 4759 if (!disks[drive][0]) 4760 break; 4761 del_timer_sync(&motor_off_timer[drive]); 4762 put_disk(disks[drive][0]); 4763 blk_mq_free_tag_set(&tag_sets[drive]); 4764 } 4765 return err; 4766 } 4767 4768 #ifndef MODULE 4769 static __init void floppy_async_init(void *data, async_cookie_t cookie) 4770 { 4771 do_floppy_init(); 4772 } 4773 #endif 4774 4775 static int __init floppy_init(void) 4776 { 4777 #ifdef MODULE 4778 return do_floppy_init(); 4779 #else 4780 /* Don't hold up the bootup by the floppy initialization */ 4781 async_schedule(floppy_async_init, NULL); 4782 return 0; 4783 #endif 4784 } 4785 4786 static const struct io_region { 4787 int offset; 4788 int size; 4789 } io_regions[] = { 4790 { 2, 1 }, 4791 /* address + 3 is sometimes reserved by pnp bios for motherboard */ 4792 { 4, 2 }, 4793 /* address + 6 is reserved, and may be taken by IDE. 4794 * Unfortunately, Adaptec doesn't know this :-(, */ 4795 { 7, 1 }, 4796 }; 4797 4798 static void floppy_release_allocated_regions(int fdc, const struct io_region *p) 4799 { 4800 while (p != io_regions) { 4801 p--; 4802 release_region(fdc_state[fdc].address + p->offset, p->size); 4803 } 4804 } 4805 4806 #define ARRAY_END(X) (&((X)[ARRAY_SIZE(X)])) 4807 4808 static int floppy_request_regions(int fdc) 4809 { 4810 const struct io_region *p; 4811 4812 for (p = io_regions; p < ARRAY_END(io_regions); p++) { 4813 if (!request_region(fdc_state[fdc].address + p->offset, 4814 p->size, "floppy")) { 4815 DPRINT("Floppy io-port 0x%04lx in use\n", 4816 fdc_state[fdc].address + p->offset); 4817 floppy_release_allocated_regions(fdc, p); 4818 return -EBUSY; 4819 } 4820 } 4821 return 0; 4822 } 4823 4824 static void floppy_release_regions(int fdc) 4825 { 4826 floppy_release_allocated_regions(fdc, ARRAY_END(io_regions)); 4827 } 4828 4829 static int floppy_grab_irq_and_dma(void) 4830 { 4831 int fdc; 4832 4833 if (atomic_inc_return(&usage_count) > 1) 4834 return 0; 4835 4836 /* 4837 * We might have scheduled a free_irq(), wait it to 4838 * drain first: 4839 */ 4840 flush_workqueue(floppy_wq); 4841 4842 if (fd_request_irq()) { 4843 DPRINT("Unable to grab IRQ%d for the floppy driver\n", 4844 FLOPPY_IRQ); 4845 atomic_dec(&usage_count); 4846 return -1; 4847 } 4848 if (fd_request_dma()) { 4849 DPRINT("Unable to grab DMA%d for the floppy driver\n", 4850 FLOPPY_DMA); 4851 if (can_use_virtual_dma & 2) 4852 use_virtual_dma = can_use_virtual_dma = 1; 4853 if (!(can_use_virtual_dma & 1)) { 4854 fd_free_irq(); 4855 atomic_dec(&usage_count); 4856 return -1; 4857 } 4858 } 4859 4860 for (fdc = 0; fdc < N_FDC; fdc++) { 4861 if (fdc_state[fdc].address != -1) { 4862 if (floppy_request_regions(fdc)) 4863 goto cleanup; 4864 } 4865 } 4866 for (fdc = 0; fdc < N_FDC; fdc++) { 4867 if (fdc_state[fdc].address != -1) { 4868 reset_fdc_info(fdc, 1); 4869 fdc_outb(fdc_state[fdc].dor, fdc, FD_DOR); 4870 } 4871 } 4872 4873 set_dor(0, ~0, 8); /* avoid immediate interrupt */ 4874 4875 for (fdc = 0; fdc < N_FDC; fdc++) 4876 if (fdc_state[fdc].address != -1) 4877 fdc_outb(fdc_state[fdc].dor, fdc, FD_DOR); 4878 /* 4879 * The driver will try and free resources and relies on us 4880 * to know if they were allocated or not. 4881 */ 4882 current_fdc = 0; 4883 irqdma_allocated = 1; 4884 return 0; 4885 cleanup: 4886 fd_free_irq(); 4887 fd_free_dma(); 4888 while (--fdc >= 0) 4889 floppy_release_regions(fdc); 4890 current_fdc = 0; 4891 atomic_dec(&usage_count); 4892 return -1; 4893 } 4894 4895 static void floppy_release_irq_and_dma(void) 4896 { 4897 int fdc; 4898 #ifndef __sparc__ 4899 int drive; 4900 #endif 4901 long tmpsize; 4902 unsigned long tmpaddr; 4903 4904 if (!atomic_dec_and_test(&usage_count)) 4905 return; 4906 4907 if (irqdma_allocated) { 4908 fd_disable_dma(); 4909 fd_free_dma(); 4910 fd_free_irq(); 4911 irqdma_allocated = 0; 4912 } 4913 set_dor(0, ~0, 8); 4914 #if N_FDC > 1 4915 set_dor(1, ~8, 0); 4916 #endif 4917 4918 if (floppy_track_buffer && max_buffer_sectors) { 4919 tmpsize = max_buffer_sectors * 1024; 4920 tmpaddr = (unsigned long)floppy_track_buffer; 4921 floppy_track_buffer = NULL; 4922 max_buffer_sectors = 0; 4923 buffer_min = buffer_max = -1; 4924 fd_dma_mem_free(tmpaddr, tmpsize); 4925 } 4926 #ifndef __sparc__ 4927 for (drive = 0; drive < N_FDC * 4; drive++) 4928 if (timer_pending(motor_off_timer + drive)) 4929 pr_info("motor off timer %d still active\n", drive); 4930 #endif 4931 4932 if (delayed_work_pending(&fd_timeout)) 4933 pr_info("floppy timer still active:%s\n", timeout_message); 4934 if (delayed_work_pending(&fd_timer)) 4935 pr_info("auxiliary floppy timer still active\n"); 4936 if (work_pending(&floppy_work)) 4937 pr_info("work still pending\n"); 4938 for (fdc = 0; fdc < N_FDC; fdc++) 4939 if (fdc_state[fdc].address != -1) 4940 floppy_release_regions(fdc); 4941 } 4942 4943 #ifdef MODULE 4944 4945 static char *floppy; 4946 4947 static void __init parse_floppy_cfg_string(char *cfg) 4948 { 4949 char *ptr; 4950 4951 while (*cfg) { 4952 ptr = cfg; 4953 while (*cfg && *cfg != ' ' && *cfg != '\t') 4954 cfg++; 4955 if (*cfg) { 4956 *cfg = '\0'; 4957 cfg++; 4958 } 4959 if (*ptr) 4960 floppy_setup(ptr); 4961 } 4962 } 4963 4964 static int __init floppy_module_init(void) 4965 { 4966 if (floppy) 4967 parse_floppy_cfg_string(floppy); 4968 return floppy_init(); 4969 } 4970 module_init(floppy_module_init); 4971 4972 static void __exit floppy_module_exit(void) 4973 { 4974 int drive, i; 4975 4976 unregister_blkdev(FLOPPY_MAJOR, "fd"); 4977 platform_driver_unregister(&floppy_driver); 4978 4979 destroy_workqueue(floppy_wq); 4980 4981 for (drive = 0; drive < N_DRIVE; drive++) { 4982 del_timer_sync(&motor_off_timer[drive]); 4983 4984 if (floppy_available(drive)) { 4985 for (i = 0; i < ARRAY_SIZE(floppy_type); i++) { 4986 if (disks[drive][i]) 4987 del_gendisk(disks[drive][i]); 4988 } 4989 if (registered[drive]) 4990 platform_device_unregister(&floppy_device[drive]); 4991 } 4992 for (i = 0; i < ARRAY_SIZE(floppy_type); i++) { 4993 if (disks[drive][i]) 4994 put_disk(disks[drive][i]); 4995 } 4996 blk_mq_free_tag_set(&tag_sets[drive]); 4997 } 4998 4999 cancel_delayed_work_sync(&fd_timeout); 5000 cancel_delayed_work_sync(&fd_timer); 5001 5002 if (atomic_read(&usage_count)) 5003 floppy_release_irq_and_dma(); 5004 5005 /* eject disk, if any */ 5006 fd_eject(0); 5007 } 5008 5009 module_exit(floppy_module_exit); 5010 5011 module_param(floppy, charp, 0); 5012 module_param(FLOPPY_IRQ, int, 0); 5013 module_param(FLOPPY_DMA, int, 0); 5014 MODULE_AUTHOR("Alain L. Knaff"); 5015 MODULE_LICENSE("GPL"); 5016 5017 /* This doesn't actually get used other than for module information */ 5018 static const struct pnp_device_id floppy_pnpids[] = { 5019 {"PNP0700", 0}, 5020 {} 5021 }; 5022 5023 MODULE_DEVICE_TABLE(pnp, floppy_pnpids); 5024 5025 #else 5026 5027 __setup("floppy=", floppy_setup); 5028 module_init(floppy_init) 5029 #endif 5030 5031 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR); 5032