1 /* 2 * linux/drivers/block/floppy.c 3 * 4 * Copyright (C) 1991, 1992 Linus Torvalds 5 * Copyright (C) 1993, 1994 Alain Knaff 6 * Copyright (C) 1998 Alan Cox 7 */ 8 9 /* 10 * 02.12.91 - Changed to static variables to indicate need for reset 11 * and recalibrate. This makes some things easier (output_byte reset 12 * checking etc), and means less interrupt jumping in case of errors, 13 * so the code is hopefully easier to understand. 14 */ 15 16 /* 17 * This file is certainly a mess. I've tried my best to get it working, 18 * but I don't like programming floppies, and I have only one anyway. 19 * Urgel. I should check for more errors, and do more graceful error 20 * recovery. Seems there are problems with several drives. I've tried to 21 * correct them. No promises. 22 */ 23 24 /* 25 * As with hd.c, all routines within this file can (and will) be called 26 * by interrupts, so extreme caution is needed. A hardware interrupt 27 * handler may not sleep, or a kernel panic will happen. Thus I cannot 28 * call "floppy-on" directly, but have to set a special timer interrupt 29 * etc. 30 */ 31 32 /* 33 * 28.02.92 - made track-buffering routines, based on the routines written 34 * by entropy@wintermute.wpi.edu (Lawrence Foard). Linus. 35 */ 36 37 /* 38 * Automatic floppy-detection and formatting written by Werner Almesberger 39 * (almesber@nessie.cs.id.ethz.ch), who also corrected some problems with 40 * the floppy-change signal detection. 41 */ 42 43 /* 44 * 1992/7/22 -- Hennus Bergman: Added better error reporting, fixed 45 * FDC data overrun bug, added some preliminary stuff for vertical 46 * recording support. 47 * 48 * 1992/9/17: Added DMA allocation & DMA functions. -- hhb. 49 * 50 * TODO: Errors are still not counted properly. 51 */ 52 53 /* 1992/9/20 54 * Modifications for ``Sector Shifting'' by Rob Hooft (hooft@chem.ruu.nl) 55 * modeled after the freeware MS-DOS program fdformat/88 V1.8 by 56 * Christoph H. Hochst\"atter. 57 * I have fixed the shift values to the ones I always use. Maybe a new 58 * ioctl() should be created to be able to modify them. 59 * There is a bug in the driver that makes it impossible to format a 60 * floppy as the first thing after bootup. 61 */ 62 63 /* 64 * 1993/4/29 -- Linus -- cleaned up the timer handling in the kernel, and 65 * this helped the floppy driver as well. Much cleaner, and still seems to 66 * work. 67 */ 68 69 /* 1994/6/24 --bbroad-- added the floppy table entries and made 70 * minor modifications to allow 2.88 floppies to be run. 71 */ 72 73 /* 1994/7/13 -- Paul Vojta -- modified the probing code to allow three or more 74 * disk types. 75 */ 76 77 /* 78 * 1994/8/8 -- Alain Knaff -- Switched to fdpatch driver: Support for bigger 79 * format bug fixes, but unfortunately some new bugs too... 80 */ 81 82 /* 1994/9/17 -- Koen Holtman -- added logging of physical floppy write 83 * errors to allow safe writing by specialized programs. 84 */ 85 86 /* 1995/4/24 -- Dan Fandrich -- added support for Commodore 1581 3.5" disks 87 * by defining bit 1 of the "stretch" parameter to mean put sectors on the 88 * opposite side of the disk, leaving the sector IDs alone (i.e. Commodore's 89 * drives are "upside-down"). 90 */ 91 92 /* 93 * 1995/8/26 -- Andreas Busse -- added Mips support. 94 */ 95 96 /* 97 * 1995/10/18 -- Ralf Baechle -- Portability cleanup; move machine dependent 98 * features to asm/floppy.h. 99 */ 100 101 /* 102 * 1998/1/21 -- Richard Gooch <rgooch@atnf.csiro.au> -- devfs support 103 */ 104 105 /* 106 * 1998/05/07 -- Russell King -- More portability cleanups; moved definition of 107 * interrupt and dma channel to asm/floppy.h. Cleaned up some formatting & 108 * use of '0' for NULL. 109 */ 110 111 /* 112 * 1998/06/07 -- Alan Cox -- Merged the 2.0.34 fixes for resource allocation 113 * failures. 114 */ 115 116 /* 117 * 1998/09/20 -- David Weinehall -- Added slow-down code for buggy PS/2-drives. 118 */ 119 120 /* 121 * 1999/08/13 -- Paul Slootman -- floppy stopped working on Alpha after 24 122 * days, 6 hours, 32 minutes and 32 seconds (i.e. MAXINT jiffies; ints were 123 * being used to store jiffies, which are unsigned longs). 124 */ 125 126 /* 127 * 2000/08/28 -- Arnaldo Carvalho de Melo <acme@conectiva.com.br> 128 * - get rid of check_region 129 * - s/suser/capable/ 130 */ 131 132 /* 133 * 2001/08/26 -- Paul Gortmaker - fix insmod oops on machines with no 134 * floppy controller (lingering task on list after module is gone... boom.) 135 */ 136 137 /* 138 * 2002/02/07 -- Anton Altaparmakov - Fix io ports reservation to correct range 139 * (0x3f2-0x3f5, 0x3f7). This fix is a bit of a hack but the proper fix 140 * requires many non-obvious changes in arch dependent code. 141 */ 142 143 /* 2003/07/28 -- Daniele Bellucci <bellucda@tiscali.it>. 144 * Better audit of register_blkdev. 145 */ 146 147 #undef FLOPPY_SILENT_DCL_CLEAR 148 149 #define REALLY_SLOW_IO 150 151 #define DEBUGT 2 152 153 #define DPRINT(format, args...) \ 154 pr_info("floppy%d: " format, current_drive, ##args) 155 156 #define DCL_DEBUG /* debug disk change line */ 157 #ifdef DCL_DEBUG 158 #define debug_dcl(test, fmt, args...) \ 159 do { if ((test) & FD_DEBUG) DPRINT(fmt, ##args); } while (0) 160 #else 161 #define debug_dcl(test, fmt, args...) \ 162 do { if (0) DPRINT(fmt, ##args); } while (0) 163 #endif 164 165 /* do print messages for unexpected interrupts */ 166 static int print_unex = 1; 167 #include <linux/module.h> 168 #include <linux/sched.h> 169 #include <linux/fs.h> 170 #include <linux/kernel.h> 171 #include <linux/timer.h> 172 #include <linux/workqueue.h> 173 #define FDPATCHES 174 #include <linux/fdreg.h> 175 #include <linux/fd.h> 176 #include <linux/hdreg.h> 177 #include <linux/errno.h> 178 #include <linux/slab.h> 179 #include <linux/mm.h> 180 #include <linux/bio.h> 181 #include <linux/string.h> 182 #include <linux/jiffies.h> 183 #include <linux/fcntl.h> 184 #include <linux/delay.h> 185 #include <linux/mc146818rtc.h> /* CMOS defines */ 186 #include <linux/ioport.h> 187 #include <linux/interrupt.h> 188 #include <linux/init.h> 189 #include <linux/platform_device.h> 190 #include <linux/mod_devicetable.h> 191 #include <linux/mutex.h> 192 #include <linux/io.h> 193 #include <linux/uaccess.h> 194 195 /* 196 * PS/2 floppies have much slower step rates than regular floppies. 197 * It's been recommended that take about 1/4 of the default speed 198 * in some more extreme cases. 199 */ 200 static DEFINE_MUTEX(floppy_mutex); 201 static int slow_floppy; 202 203 #include <asm/dma.h> 204 #include <asm/irq.h> 205 206 static int FLOPPY_IRQ = 6; 207 static int FLOPPY_DMA = 2; 208 static int can_use_virtual_dma = 2; 209 /* ======= 210 * can use virtual DMA: 211 * 0 = use of virtual DMA disallowed by config 212 * 1 = use of virtual DMA prescribed by config 213 * 2 = no virtual DMA preference configured. By default try hard DMA, 214 * but fall back on virtual DMA when not enough memory available 215 */ 216 217 static int use_virtual_dma; 218 /* ======= 219 * use virtual DMA 220 * 0 using hard DMA 221 * 1 using virtual DMA 222 * This variable is set to virtual when a DMA mem problem arises, and 223 * reset back in floppy_grab_irq_and_dma. 224 * It is not safe to reset it in other circumstances, because the floppy 225 * driver may have several buffers in use at once, and we do currently not 226 * record each buffers capabilities 227 */ 228 229 static DEFINE_SPINLOCK(floppy_lock); 230 231 static unsigned short virtual_dma_port = 0x3f0; 232 irqreturn_t floppy_interrupt(int irq, void *dev_id); 233 static int set_dor(int fdc, char mask, char data); 234 235 #define K_64 0x10000 /* 64KB */ 236 237 /* the following is the mask of allowed drives. By default units 2 and 238 * 3 of both floppy controllers are disabled, because switching on the 239 * motor of these drives causes system hangs on some PCI computers. drive 240 * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if 241 * a drive is allowed. 242 * 243 * NOTE: This must come before we include the arch floppy header because 244 * some ports reference this variable from there. -DaveM 245 */ 246 247 static int allowed_drive_mask = 0x33; 248 249 #include <asm/floppy.h> 250 251 static int irqdma_allocated; 252 253 #include <linux/blkdev.h> 254 #include <linux/blkpg.h> 255 #include <linux/cdrom.h> /* for the compatibility eject ioctl */ 256 #include <linux/completion.h> 257 258 static struct request *current_req; 259 static void do_fd_request(struct request_queue *q); 260 static int set_next_request(void); 261 262 #ifndef fd_get_dma_residue 263 #define fd_get_dma_residue() get_dma_residue(FLOPPY_DMA) 264 #endif 265 266 /* Dma Memory related stuff */ 267 268 #ifndef fd_dma_mem_free 269 #define fd_dma_mem_free(addr, size) free_pages(addr, get_order(size)) 270 #endif 271 272 #ifndef fd_dma_mem_alloc 273 #define fd_dma_mem_alloc(size) __get_dma_pages(GFP_KERNEL, get_order(size)) 274 #endif 275 276 static inline void fallback_on_nodma_alloc(char **addr, size_t l) 277 { 278 #ifdef FLOPPY_CAN_FALLBACK_ON_NODMA 279 if (*addr) 280 return; /* we have the memory */ 281 if (can_use_virtual_dma != 2) 282 return; /* no fallback allowed */ 283 pr_info("DMA memory shortage. Temporarily falling back on virtual DMA\n"); 284 *addr = (char *)nodma_mem_alloc(l); 285 #else 286 return; 287 #endif 288 } 289 290 /* End dma memory related stuff */ 291 292 static unsigned long fake_change; 293 static bool initialized; 294 295 #define ITYPE(x) (((x) >> 2) & 0x1f) 296 #define TOMINOR(x) ((x & 3) | ((x & 4) << 5)) 297 #define UNIT(x) ((x) & 0x03) /* drive on fdc */ 298 #define FDC(x) (((x) & 0x04) >> 2) /* fdc of drive */ 299 /* reverse mapping from unit and fdc to drive */ 300 #define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2)) 301 302 #define DP (&drive_params[current_drive]) 303 #define DRS (&drive_state[current_drive]) 304 #define DRWE (&write_errors[current_drive]) 305 #define FDCS (&fdc_state[fdc]) 306 307 #define UDP (&drive_params[drive]) 308 #define UDRS (&drive_state[drive]) 309 #define UDRWE (&write_errors[drive]) 310 #define UFDCS (&fdc_state[FDC(drive)]) 311 312 #define PH_HEAD(floppy, head) (((((floppy)->stretch & 2) >> 1) ^ head) << 2) 313 #define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH) 314 315 /* read/write */ 316 #define COMMAND (raw_cmd->cmd[0]) 317 #define DR_SELECT (raw_cmd->cmd[1]) 318 #define TRACK (raw_cmd->cmd[2]) 319 #define HEAD (raw_cmd->cmd[3]) 320 #define SECTOR (raw_cmd->cmd[4]) 321 #define SIZECODE (raw_cmd->cmd[5]) 322 #define SECT_PER_TRACK (raw_cmd->cmd[6]) 323 #define GAP (raw_cmd->cmd[7]) 324 #define SIZECODE2 (raw_cmd->cmd[8]) 325 #define NR_RW 9 326 327 /* format */ 328 #define F_SIZECODE (raw_cmd->cmd[2]) 329 #define F_SECT_PER_TRACK (raw_cmd->cmd[3]) 330 #define F_GAP (raw_cmd->cmd[4]) 331 #define F_FILL (raw_cmd->cmd[5]) 332 #define NR_F 6 333 334 /* 335 * Maximum disk size (in kilobytes). 336 * This default is used whenever the current disk size is unknown. 337 * [Now it is rather a minimum] 338 */ 339 #define MAX_DISK_SIZE 4 /* 3984 */ 340 341 /* 342 * globals used by 'result()' 343 */ 344 #define MAX_REPLIES 16 345 static unsigned char reply_buffer[MAX_REPLIES]; 346 static int inr; /* size of reply buffer, when called from interrupt */ 347 #define ST0 (reply_buffer[0]) 348 #define ST1 (reply_buffer[1]) 349 #define ST2 (reply_buffer[2]) 350 #define ST3 (reply_buffer[0]) /* result of GETSTATUS */ 351 #define R_TRACK (reply_buffer[3]) 352 #define R_HEAD (reply_buffer[4]) 353 #define R_SECTOR (reply_buffer[5]) 354 #define R_SIZECODE (reply_buffer[6]) 355 356 #define SEL_DLY (2 * HZ / 100) 357 358 /* 359 * this struct defines the different floppy drive types. 360 */ 361 static struct { 362 struct floppy_drive_params params; 363 const char *name; /* name printed while booting */ 364 } default_drive_params[] = { 365 /* NOTE: the time values in jiffies should be in msec! 366 CMOS drive type 367 | Maximum data rate supported by drive type 368 | | Head load time, msec 369 | | | Head unload time, msec (not used) 370 | | | | Step rate interval, usec 371 | | | | | Time needed for spinup time (jiffies) 372 | | | | | | Timeout for spinning down (jiffies) 373 | | | | | | | Spindown offset (where disk stops) 374 | | | | | | | | Select delay 375 | | | | | | | | | RPS 376 | | | | | | | | | | Max number of tracks 377 | | | | | | | | | | | Interrupt timeout 378 | | | | | | | | | | | | Max nonintlv. sectors 379 | | | | | | | | | | | | | -Max Errors- flags */ 380 {{0, 500, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 80, 3*HZ, 20, {3,1,2,0,2}, 0, 381 0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" }, 382 383 {{1, 300, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 40, 3*HZ, 17, {3,1,2,0,2}, 0, 384 0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/ 385 386 {{2, 500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6, 83, 3*HZ, 17, {3,1,2,0,2}, 0, 387 0, { 2, 5, 6,23,10,20,12, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/ 388 389 {{3, 250, 16, 16, 3000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0, 390 0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/ 391 392 {{4, 500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0, 393 0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/ 394 395 {{5, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0, 396 0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/ 397 398 {{6, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0, 399 0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/ 400 /* | --autodetected formats--- | | | 401 * read_track | | Name printed when booting 402 * | Native format 403 * Frequency of disk change checks */ 404 }; 405 406 static struct floppy_drive_params drive_params[N_DRIVE]; 407 static struct floppy_drive_struct drive_state[N_DRIVE]; 408 static struct floppy_write_errors write_errors[N_DRIVE]; 409 static struct timer_list motor_off_timer[N_DRIVE]; 410 static struct gendisk *disks[N_DRIVE]; 411 static struct block_device *opened_bdev[N_DRIVE]; 412 static DEFINE_MUTEX(open_lock); 413 static struct floppy_raw_cmd *raw_cmd, default_raw_cmd; 414 static int fdc_queue; 415 416 /* 417 * This struct defines the different floppy types. 418 * 419 * Bit 0 of 'stretch' tells if the tracks need to be doubled for some 420 * types (e.g. 360kB diskette in 1.2MB drive, etc.). Bit 1 of 'stretch' 421 * tells if the disk is in Commodore 1581 format, which means side 0 sectors 422 * are located on side 1 of the disk but with a side 0 ID, and vice-versa. 423 * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the 424 * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical 425 * side 0 is on physical side 0 (but with the misnamed sector IDs). 426 * 'stretch' should probably be renamed to something more general, like 427 * 'options'. 428 * 429 * Bits 2 through 9 of 'stretch' tell the number of the first sector. 430 * The LSB (bit 2) is flipped. For most disks, the first sector 431 * is 1 (represented by 0x00<<2). For some CP/M and music sampler 432 * disks (such as Ensoniq EPS 16plus) it is 0 (represented as 0x01<<2). 433 * For Amstrad CPC disks it is 0xC1 (represented as 0xC0<<2). 434 * 435 * Other parameters should be self-explanatory (see also setfdprm(8)). 436 */ 437 /* 438 Size 439 | Sectors per track 440 | | Head 441 | | | Tracks 442 | | | | Stretch 443 | | | | | Gap 1 size 444 | | | | | | Data rate, | 0x40 for perp 445 | | | | | | | Spec1 (stepping rate, head unload 446 | | | | | | | | /fmt gap (gap2) */ 447 static struct floppy_struct floppy_type[32] = { 448 { 0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL }, /* 0 no testing */ 449 { 720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360" }, /* 1 360KB PC */ 450 { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /* 2 1.2MB AT */ 451 { 720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360" }, /* 3 360KB SS 3.5" */ 452 { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720" }, /* 4 720KB 3.5" */ 453 { 720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360" }, /* 5 360KB AT */ 454 { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720" }, /* 6 720KB AT */ 455 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /* 7 1.44MB 3.5" */ 456 { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /* 8 2.88MB 3.5" */ 457 { 6240,39,2,80,0,0x1B,0x43,0xAF,0x28,"E3120" }, /* 9 3.12MB 3.5" */ 458 459 { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25" */ 460 { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5" */ 461 { 820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410" }, /* 12 410KB 5.25" */ 462 { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820" }, /* 13 820KB 3.5" */ 463 { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25" */ 464 { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5" */ 465 { 840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420" }, /* 16 420KB 5.25" */ 466 { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830" }, /* 17 830KB 3.5" */ 467 { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25" */ 468 { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5" */ 469 470 { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880" }, /* 20 880KB 5.25" */ 471 { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5" */ 472 { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5" */ 473 { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25" */ 474 { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5" */ 475 { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5" */ 476 { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5" */ 477 { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5" */ 478 { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5" */ 479 { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5" */ 480 481 { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800" }, /* 30 800KB 3.5" */ 482 { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5" */ 483 }; 484 485 #define SECTSIZE (_FD_SECTSIZE(*floppy)) 486 487 /* Auto-detection: Disk type used until the next media change occurs. */ 488 static struct floppy_struct *current_type[N_DRIVE]; 489 490 /* 491 * User-provided type information. current_type points to 492 * the respective entry of this array. 493 */ 494 static struct floppy_struct user_params[N_DRIVE]; 495 496 static sector_t floppy_sizes[256]; 497 498 static char floppy_device_name[] = "floppy"; 499 500 /* 501 * The driver is trying to determine the correct media format 502 * while probing is set. rw_interrupt() clears it after a 503 * successful access. 504 */ 505 static int probing; 506 507 /* Synchronization of FDC access. */ 508 #define FD_COMMAND_NONE -1 509 #define FD_COMMAND_ERROR 2 510 #define FD_COMMAND_OKAY 3 511 512 static volatile int command_status = FD_COMMAND_NONE; 513 static unsigned long fdc_busy; 514 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait); 515 static DECLARE_WAIT_QUEUE_HEAD(command_done); 516 517 /* Errors during formatting are counted here. */ 518 static int format_errors; 519 520 /* Format request descriptor. */ 521 static struct format_descr format_req; 522 523 /* 524 * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps 525 * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc), 526 * H is head unload time (1=16ms, 2=32ms, etc) 527 */ 528 529 /* 530 * Track buffer 531 * Because these are written to by the DMA controller, they must 532 * not contain a 64k byte boundary crossing, or data will be 533 * corrupted/lost. 534 */ 535 static char *floppy_track_buffer; 536 static int max_buffer_sectors; 537 538 static int *errors; 539 typedef void (*done_f)(int); 540 static const struct cont_t { 541 void (*interrupt)(void); 542 /* this is called after the interrupt of the 543 * main command */ 544 void (*redo)(void); /* this is called to retry the operation */ 545 void (*error)(void); /* this is called to tally an error */ 546 done_f done; /* this is called to say if the operation has 547 * succeeded/failed */ 548 } *cont; 549 550 static void floppy_ready(void); 551 static void floppy_start(void); 552 static void process_fd_request(void); 553 static void recalibrate_floppy(void); 554 static void floppy_shutdown(struct work_struct *); 555 556 static int floppy_request_regions(int); 557 static void floppy_release_regions(int); 558 static int floppy_grab_irq_and_dma(void); 559 static void floppy_release_irq_and_dma(void); 560 561 /* 562 * The "reset" variable should be tested whenever an interrupt is scheduled, 563 * after the commands have been sent. This is to ensure that the driver doesn't 564 * get wedged when the interrupt doesn't come because of a failed command. 565 * reset doesn't need to be tested before sending commands, because 566 * output_byte is automatically disabled when reset is set. 567 */ 568 static void reset_fdc(void); 569 570 /* 571 * These are global variables, as that's the easiest way to give 572 * information to interrupts. They are the data used for the current 573 * request. 574 */ 575 #define NO_TRACK -1 576 #define NEED_1_RECAL -2 577 #define NEED_2_RECAL -3 578 579 static atomic_t usage_count = ATOMIC_INIT(0); 580 581 /* buffer related variables */ 582 static int buffer_track = -1; 583 static int buffer_drive = -1; 584 static int buffer_min = -1; 585 static int buffer_max = -1; 586 587 /* fdc related variables, should end up in a struct */ 588 static struct floppy_fdc_state fdc_state[N_FDC]; 589 static int fdc; /* current fdc */ 590 591 static struct workqueue_struct *floppy_wq; 592 593 static struct floppy_struct *_floppy = floppy_type; 594 static unsigned char current_drive; 595 static long current_count_sectors; 596 static unsigned char fsector_t; /* sector in track */ 597 static unsigned char in_sector_offset; /* offset within physical sector, 598 * expressed in units of 512 bytes */ 599 600 static inline bool drive_no_geom(int drive) 601 { 602 return !current_type[drive] && !ITYPE(UDRS->fd_device); 603 } 604 605 #ifndef fd_eject 606 static inline int fd_eject(int drive) 607 { 608 return -EINVAL; 609 } 610 #endif 611 612 /* 613 * Debugging 614 * ========= 615 */ 616 #ifdef DEBUGT 617 static long unsigned debugtimer; 618 619 static inline void set_debugt(void) 620 { 621 debugtimer = jiffies; 622 } 623 624 static inline void debugt(const char *func, const char *msg) 625 { 626 if (DP->flags & DEBUGT) 627 pr_info("%s:%s dtime=%lu\n", func, msg, jiffies - debugtimer); 628 } 629 #else 630 static inline void set_debugt(void) { } 631 static inline void debugt(const char *func, const char *msg) { } 632 #endif /* DEBUGT */ 633 634 635 static DECLARE_DELAYED_WORK(fd_timeout, floppy_shutdown); 636 static const char *timeout_message; 637 638 static void is_alive(const char *func, const char *message) 639 { 640 /* this routine checks whether the floppy driver is "alive" */ 641 if (test_bit(0, &fdc_busy) && command_status < 2 && 642 !delayed_work_pending(&fd_timeout)) { 643 DPRINT("%s: timeout handler died. %s\n", func, message); 644 } 645 } 646 647 static void (*do_floppy)(void) = NULL; 648 649 #define OLOGSIZE 20 650 651 static void (*lasthandler)(void); 652 static unsigned long interruptjiffies; 653 static unsigned long resultjiffies; 654 static int resultsize; 655 static unsigned long lastredo; 656 657 static struct output_log { 658 unsigned char data; 659 unsigned char status; 660 unsigned long jiffies; 661 } output_log[OLOGSIZE]; 662 663 static int output_log_pos; 664 665 #define current_reqD -1 666 #define MAXTIMEOUT -2 667 668 static void __reschedule_timeout(int drive, const char *message) 669 { 670 unsigned long delay; 671 672 if (drive == current_reqD) 673 drive = current_drive; 674 __cancel_delayed_work(&fd_timeout); 675 676 if (drive < 0 || drive >= N_DRIVE) { 677 delay = 20UL * HZ; 678 drive = 0; 679 } else 680 delay = UDP->timeout; 681 682 queue_delayed_work(floppy_wq, &fd_timeout, delay); 683 if (UDP->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, UDRS->select_date + UDP->select_delay)) 738 DPRINT("WARNING disk change called early\n"); 739 if (!(FDCS->dor & (0x10 << UNIT(drive))) || 740 (FDCS->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)FDCS->dor); 744 } 745 746 debug_dcl(UDP->flags, 747 "checking disk change line for drive %d\n", drive); 748 debug_dcl(UDP->flags, "jiffies=%lu\n", jiffies); 749 debug_dcl(UDP->flags, "disk change line=%x\n", fd_inb(FD_DIR) & 0x80); 750 debug_dcl(UDP->flags, "flags=%lx\n", UDRS->flags); 751 752 if (UDP->flags & FD_BROKEN_DCL) 753 return test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags); 754 if ((fd_inb(FD_DIR) ^ UDP->flags) & 0x80) { 755 set_bit(FD_VERIFY_BIT, &UDRS->flags); 756 /* verify write protection */ 757 758 if (UDRS->maxblock) /* mark it changed */ 759 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags); 760 761 /* invalidate its geometry */ 762 if (UDRS->keep_data >= 0) { 763 if ((UDP->flags & FTD_MSG) && 764 current_type[drive] != NULL) 765 DPRINT("Disk type is undefined after disk change\n"); 766 current_type[drive] = NULL; 767 floppy_sizes[TOMINOR(drive)] = MAX_DISK_SIZE << 1; 768 } 769 770 return 1; 771 } else { 772 UDRS->last_checked = jiffies; 773 clear_bit(FD_DISK_NEWCHANGE_BIT, &UDRS->flags); 774 } 775 return 0; 776 } 777 778 static inline int is_selected(int dor, int unit) 779 { 780 return ((dor & (0x10 << unit)) && (dor & 3) == unit); 781 } 782 783 static bool is_ready_state(int status) 784 { 785 int state = status & (STATUS_READY | STATUS_DIR | STATUS_DMA); 786 return state == STATUS_READY; 787 } 788 789 static int set_dor(int fdc, char mask, char data) 790 { 791 unsigned char unit; 792 unsigned char drive; 793 unsigned char newdor; 794 unsigned char olddor; 795 796 if (FDCS->address == -1) 797 return -1; 798 799 olddor = FDCS->dor; 800 newdor = (olddor & mask) | data; 801 if (newdor != olddor) { 802 unit = olddor & 0x3; 803 if (is_selected(olddor, unit) && !is_selected(newdor, unit)) { 804 drive = REVDRIVE(fdc, unit); 805 debug_dcl(UDP->flags, 806 "calling disk change from set_dor\n"); 807 disk_change(drive); 808 } 809 FDCS->dor = newdor; 810 fd_outb(newdor, FD_DOR); 811 812 unit = newdor & 0x3; 813 if (!is_selected(olddor, unit) && is_selected(newdor, unit)) { 814 drive = REVDRIVE(fdc, unit); 815 UDRS->select_date = jiffies; 816 } 817 } 818 return olddor; 819 } 820 821 static void twaddle(void) 822 { 823 if (DP->select_delay) 824 return; 825 fd_outb(FDCS->dor & ~(0x10 << UNIT(current_drive)), FD_DOR); 826 fd_outb(FDCS->dor, FD_DOR); 827 DRS->select_date = jiffies; 828 } 829 830 /* 831 * Reset all driver information about the current fdc. 832 * This is needed after a reset, and after a raw command. 833 */ 834 static void reset_fdc_info(int mode) 835 { 836 int drive; 837 838 FDCS->spec1 = FDCS->spec2 = -1; 839 FDCS->need_configure = 1; 840 FDCS->perp_mode = 1; 841 FDCS->rawcmd = 0; 842 for (drive = 0; drive < N_DRIVE; drive++) 843 if (FDC(drive) == fdc && (mode || UDRS->track != NEED_1_RECAL)) 844 UDRS->track = NEED_2_RECAL; 845 } 846 847 /* selects the fdc and drive, and enables the fdc's input/dma. */ 848 static void set_fdc(int drive) 849 { 850 if (drive >= 0 && drive < N_DRIVE) { 851 fdc = FDC(drive); 852 current_drive = drive; 853 } 854 if (fdc != 1 && fdc != 0) { 855 pr_info("bad fdc value\n"); 856 return; 857 } 858 set_dor(fdc, ~0, 8); 859 #if N_FDC > 1 860 set_dor(1 - fdc, ~8, 0); 861 #endif 862 if (FDCS->rawcmd == 2) 863 reset_fdc_info(1); 864 if (fd_inb(FD_STATUS) != STATUS_READY) 865 FDCS->reset = 1; 866 } 867 868 /* locks the driver */ 869 static int lock_fdc(int drive, bool interruptible) 870 { 871 if (WARN(atomic_read(&usage_count) == 0, 872 "Trying to lock fdc while usage count=0\n")) 873 return -1; 874 875 if (wait_event_interruptible(fdc_wait, !test_and_set_bit(0, &fdc_busy))) 876 return -EINTR; 877 878 command_status = FD_COMMAND_NONE; 879 880 reschedule_timeout(drive, "lock fdc"); 881 set_fdc(drive); 882 return 0; 883 } 884 885 /* unlocks the driver */ 886 static void unlock_fdc(void) 887 { 888 if (!test_bit(0, &fdc_busy)) 889 DPRINT("FDC access conflict!\n"); 890 891 raw_cmd = NULL; 892 command_status = FD_COMMAND_NONE; 893 __cancel_delayed_work(&fd_timeout); 894 do_floppy = NULL; 895 cont = NULL; 896 clear_bit(0, &fdc_busy); 897 wake_up(&fdc_wait); 898 } 899 900 /* switches the motor off after a given timeout */ 901 static void motor_off_callback(unsigned long nr) 902 { 903 unsigned char mask = ~(0x10 << UNIT(nr)); 904 905 set_dor(FDC(nr), mask, 0); 906 } 907 908 /* schedules motor off */ 909 static void floppy_off(unsigned int drive) 910 { 911 unsigned long volatile delta; 912 int fdc = FDC(drive); 913 914 if (!(FDCS->dor & (0x10 << UNIT(drive)))) 915 return; 916 917 del_timer(motor_off_timer + drive); 918 919 /* make spindle stop in a position which minimizes spinup time 920 * next time */ 921 if (UDP->rps) { 922 delta = jiffies - UDRS->first_read_date + HZ - 923 UDP->spindown_offset; 924 delta = ((delta * UDP->rps) % HZ) / UDP->rps; 925 motor_off_timer[drive].expires = 926 jiffies + UDP->spindown - delta; 927 } 928 add_timer(motor_off_timer + drive); 929 } 930 931 /* 932 * cycle through all N_DRIVE floppy drives, for disk change testing. 933 * stopping at current drive. This is done before any long operation, to 934 * be sure to have up to date disk change information. 935 */ 936 static void scandrives(void) 937 { 938 int i; 939 int drive; 940 int saved_drive; 941 942 if (DP->select_delay) 943 return; 944 945 saved_drive = current_drive; 946 for (i = 0; i < N_DRIVE; i++) { 947 drive = (saved_drive + i + 1) % N_DRIVE; 948 if (UDRS->fd_ref == 0 || UDP->select_delay != 0) 949 continue; /* skip closed drives */ 950 set_fdc(drive); 951 if (!(set_dor(fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) & 952 (0x10 << UNIT(drive)))) 953 /* switch the motor off again, if it was off to 954 * begin with */ 955 set_dor(fdc, ~(0x10 << UNIT(drive)), 0); 956 } 957 set_fdc(saved_drive); 958 } 959 960 static void empty(void) 961 { 962 } 963 964 static DECLARE_WORK(floppy_work, NULL); 965 966 static void schedule_bh(void (*handler)(void)) 967 { 968 WARN_ON(work_pending(&floppy_work)); 969 970 PREPARE_WORK(&floppy_work, (work_func_t)handler); 971 queue_work(floppy_wq, &floppy_work); 972 } 973 974 static DECLARE_DELAYED_WORK(fd_timer, NULL); 975 976 static void cancel_activity(void) 977 { 978 do_floppy = NULL; 979 cancel_delayed_work_sync(&fd_timer); 980 cancel_work_sync(&floppy_work); 981 } 982 983 /* this function makes sure that the disk stays in the drive during the 984 * transfer */ 985 static void fd_watchdog(struct work_struct *arg) 986 { 987 debug_dcl(DP->flags, "calling disk change from watchdog\n"); 988 989 if (disk_change(current_drive)) { 990 DPRINT("disk removed during i/o\n"); 991 cancel_activity(); 992 cont->done(0); 993 reset_fdc(); 994 } else { 995 cancel_delayed_work(&fd_timer); 996 PREPARE_DELAYED_WORK(&fd_timer, fd_watchdog); 997 queue_delayed_work(floppy_wq, &fd_timer, HZ / 10); 998 } 999 } 1000 1001 static void main_command_interrupt(void) 1002 { 1003 cancel_delayed_work(&fd_timer); 1004 cont->interrupt(); 1005 } 1006 1007 /* waits for a delay (spinup or select) to pass */ 1008 static int fd_wait_for_completion(unsigned long expires, work_func_t function) 1009 { 1010 if (FDCS->reset) { 1011 reset_fdc(); /* do the reset during sleep to win time 1012 * if we don't need to sleep, it's a good 1013 * occasion anyways */ 1014 return 1; 1015 } 1016 1017 if (time_before(jiffies, expires)) { 1018 cancel_delayed_work(&fd_timer); 1019 PREPARE_DELAYED_WORK(&fd_timer, function); 1020 queue_delayed_work(floppy_wq, &fd_timer, expires - jiffies); 1021 return 1; 1022 } 1023 return 0; 1024 } 1025 1026 static void setup_DMA(void) 1027 { 1028 unsigned long f; 1029 1030 if (raw_cmd->length == 0) { 1031 int i; 1032 1033 pr_info("zero dma transfer size:"); 1034 for (i = 0; i < raw_cmd->cmd_count; i++) 1035 pr_cont("%x,", raw_cmd->cmd[i]); 1036 pr_cont("\n"); 1037 cont->done(0); 1038 FDCS->reset = 1; 1039 return; 1040 } 1041 if (((unsigned long)raw_cmd->kernel_data) % 512) { 1042 pr_info("non aligned address: %p\n", raw_cmd->kernel_data); 1043 cont->done(0); 1044 FDCS->reset = 1; 1045 return; 1046 } 1047 f = claim_dma_lock(); 1048 fd_disable_dma(); 1049 #ifdef fd_dma_setup 1050 if (fd_dma_setup(raw_cmd->kernel_data, raw_cmd->length, 1051 (raw_cmd->flags & FD_RAW_READ) ? 1052 DMA_MODE_READ : DMA_MODE_WRITE, FDCS->address) < 0) { 1053 release_dma_lock(f); 1054 cont->done(0); 1055 FDCS->reset = 1; 1056 return; 1057 } 1058 release_dma_lock(f); 1059 #else 1060 fd_clear_dma_ff(); 1061 fd_cacheflush(raw_cmd->kernel_data, raw_cmd->length); 1062 fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ) ? 1063 DMA_MODE_READ : DMA_MODE_WRITE); 1064 fd_set_dma_addr(raw_cmd->kernel_data); 1065 fd_set_dma_count(raw_cmd->length); 1066 virtual_dma_port = FDCS->address; 1067 fd_enable_dma(); 1068 release_dma_lock(f); 1069 #endif 1070 } 1071 1072 static void show_floppy(void); 1073 1074 /* waits until the fdc becomes ready */ 1075 static int wait_til_ready(void) 1076 { 1077 int status; 1078 int counter; 1079 1080 if (FDCS->reset) 1081 return -1; 1082 for (counter = 0; counter < 10000; counter++) { 1083 status = fd_inb(FD_STATUS); 1084 if (status & STATUS_READY) 1085 return status; 1086 } 1087 if (initialized) { 1088 DPRINT("Getstatus times out (%x) on fdc %d\n", status, fdc); 1089 show_floppy(); 1090 } 1091 FDCS->reset = 1; 1092 return -1; 1093 } 1094 1095 /* sends a command byte to the fdc */ 1096 static int output_byte(char byte) 1097 { 1098 int status = wait_til_ready(); 1099 1100 if (status < 0) 1101 return -1; 1102 1103 if (is_ready_state(status)) { 1104 fd_outb(byte, FD_DATA); 1105 output_log[output_log_pos].data = byte; 1106 output_log[output_log_pos].status = status; 1107 output_log[output_log_pos].jiffies = jiffies; 1108 output_log_pos = (output_log_pos + 1) % OLOGSIZE; 1109 return 0; 1110 } 1111 FDCS->reset = 1; 1112 if (initialized) { 1113 DPRINT("Unable to send byte %x to FDC. Fdc=%x Status=%x\n", 1114 byte, fdc, status); 1115 show_floppy(); 1116 } 1117 return -1; 1118 } 1119 1120 /* gets the response from the fdc */ 1121 static int result(void) 1122 { 1123 int i; 1124 int status = 0; 1125 1126 for (i = 0; i < MAX_REPLIES; i++) { 1127 status = wait_til_ready(); 1128 if (status < 0) 1129 break; 1130 status &= STATUS_DIR | STATUS_READY | STATUS_BUSY | STATUS_DMA; 1131 if ((status & ~STATUS_BUSY) == STATUS_READY) { 1132 resultjiffies = jiffies; 1133 resultsize = i; 1134 return i; 1135 } 1136 if (status == (STATUS_DIR | STATUS_READY | STATUS_BUSY)) 1137 reply_buffer[i] = fd_inb(FD_DATA); 1138 else 1139 break; 1140 } 1141 if (initialized) { 1142 DPRINT("get result error. Fdc=%d Last status=%x Read bytes=%d\n", 1143 fdc, status, i); 1144 show_floppy(); 1145 } 1146 FDCS->reset = 1; 1147 return -1; 1148 } 1149 1150 #define MORE_OUTPUT -2 1151 /* does the fdc need more output? */ 1152 static int need_more_output(void) 1153 { 1154 int status = wait_til_ready(); 1155 1156 if (status < 0) 1157 return -1; 1158 1159 if (is_ready_state(status)) 1160 return MORE_OUTPUT; 1161 1162 return result(); 1163 } 1164 1165 /* Set perpendicular mode as required, based on data rate, if supported. 1166 * 82077 Now tested. 1Mbps data rate only possible with 82077-1. 1167 */ 1168 static void perpendicular_mode(void) 1169 { 1170 unsigned char perp_mode; 1171 1172 if (raw_cmd->rate & 0x40) { 1173 switch (raw_cmd->rate & 3) { 1174 case 0: 1175 perp_mode = 2; 1176 break; 1177 case 3: 1178 perp_mode = 3; 1179 break; 1180 default: 1181 DPRINT("Invalid data rate for perpendicular mode!\n"); 1182 cont->done(0); 1183 FDCS->reset = 1; 1184 /* 1185 * convenient way to return to 1186 * redo without too much hassle 1187 * (deep stack et al.) 1188 */ 1189 return; 1190 } 1191 } else 1192 perp_mode = 0; 1193 1194 if (FDCS->perp_mode == perp_mode) 1195 return; 1196 if (FDCS->version >= FDC_82077_ORIG) { 1197 output_byte(FD_PERPENDICULAR); 1198 output_byte(perp_mode); 1199 FDCS->perp_mode = perp_mode; 1200 } else if (perp_mode) { 1201 DPRINT("perpendicular mode not supported by this FDC.\n"); 1202 } 1203 } /* perpendicular_mode */ 1204 1205 static int fifo_depth = 0xa; 1206 static int no_fifo; 1207 1208 static int fdc_configure(void) 1209 { 1210 /* Turn on FIFO */ 1211 output_byte(FD_CONFIGURE); 1212 if (need_more_output() != MORE_OUTPUT) 1213 return 0; 1214 output_byte(0); 1215 output_byte(0x10 | (no_fifo & 0x20) | (fifo_depth & 0xf)); 1216 output_byte(0); /* pre-compensation from track 1217 0 upwards */ 1218 return 1; 1219 } 1220 1221 #define NOMINAL_DTR 500 1222 1223 /* Issue a "SPECIFY" command to set the step rate time, head unload time, 1224 * head load time, and DMA disable flag to values needed by floppy. 1225 * 1226 * The value "dtr" is the data transfer rate in Kbps. It is needed 1227 * to account for the data rate-based scaling done by the 82072 and 82077 1228 * FDC types. This parameter is ignored for other types of FDCs (i.e. 1229 * 8272a). 1230 * 1231 * Note that changing the data transfer rate has a (probably deleterious) 1232 * effect on the parameters subject to scaling for 82072/82077 FDCs, so 1233 * fdc_specify is called again after each data transfer rate 1234 * change. 1235 * 1236 * srt: 1000 to 16000 in microseconds 1237 * hut: 16 to 240 milliseconds 1238 * hlt: 2 to 254 milliseconds 1239 * 1240 * These values are rounded up to the next highest available delay time. 1241 */ 1242 static void fdc_specify(void) 1243 { 1244 unsigned char spec1; 1245 unsigned char spec2; 1246 unsigned long srt; 1247 unsigned long hlt; 1248 unsigned long hut; 1249 unsigned long dtr = NOMINAL_DTR; 1250 unsigned long scale_dtr = NOMINAL_DTR; 1251 int hlt_max_code = 0x7f; 1252 int hut_max_code = 0xf; 1253 1254 if (FDCS->need_configure && FDCS->version >= FDC_82072A) { 1255 fdc_configure(); 1256 FDCS->need_configure = 0; 1257 } 1258 1259 switch (raw_cmd->rate & 0x03) { 1260 case 3: 1261 dtr = 1000; 1262 break; 1263 case 1: 1264 dtr = 300; 1265 if (FDCS->version >= FDC_82078) { 1266 /* chose the default rate table, not the one 1267 * where 1 = 2 Mbps */ 1268 output_byte(FD_DRIVESPEC); 1269 if (need_more_output() == MORE_OUTPUT) { 1270 output_byte(UNIT(current_drive)); 1271 output_byte(0xc0); 1272 } 1273 } 1274 break; 1275 case 2: 1276 dtr = 250; 1277 break; 1278 } 1279 1280 if (FDCS->version >= FDC_82072) { 1281 scale_dtr = dtr; 1282 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */ 1283 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */ 1284 } 1285 1286 /* Convert step rate from microseconds to milliseconds and 4 bits */ 1287 srt = 16 - DIV_ROUND_UP(DP->srt * scale_dtr / 1000, NOMINAL_DTR); 1288 if (slow_floppy) 1289 srt = srt / 4; 1290 1291 SUPBOUND(srt, 0xf); 1292 INFBOUND(srt, 0); 1293 1294 hlt = DIV_ROUND_UP(DP->hlt * scale_dtr / 2, NOMINAL_DTR); 1295 if (hlt < 0x01) 1296 hlt = 0x01; 1297 else if (hlt > 0x7f) 1298 hlt = hlt_max_code; 1299 1300 hut = DIV_ROUND_UP(DP->hut * scale_dtr / 16, NOMINAL_DTR); 1301 if (hut < 0x1) 1302 hut = 0x1; 1303 else if (hut > 0xf) 1304 hut = hut_max_code; 1305 1306 spec1 = (srt << 4) | hut; 1307 spec2 = (hlt << 1) | (use_virtual_dma & 1); 1308 1309 /* If these parameters did not change, just return with success */ 1310 if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) { 1311 /* Go ahead and set spec1 and spec2 */ 1312 output_byte(FD_SPECIFY); 1313 output_byte(FDCS->spec1 = spec1); 1314 output_byte(FDCS->spec2 = spec2); 1315 } 1316 } /* fdc_specify */ 1317 1318 /* Set the FDC's data transfer rate on behalf of the specified drive. 1319 * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue 1320 * of the specify command (i.e. using the fdc_specify function). 1321 */ 1322 static int fdc_dtr(void) 1323 { 1324 /* If data rate not already set to desired value, set it. */ 1325 if ((raw_cmd->rate & 3) == FDCS->dtr) 1326 return 0; 1327 1328 /* Set dtr */ 1329 fd_outb(raw_cmd->rate & 3, FD_DCR); 1330 1331 /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB) 1332 * need a stabilization period of several milliseconds to be 1333 * enforced after data rate changes before R/W operations. 1334 * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies) 1335 */ 1336 FDCS->dtr = raw_cmd->rate & 3; 1337 return fd_wait_for_completion(jiffies + 2UL * HZ / 100, 1338 (work_func_t)floppy_ready); 1339 } /* fdc_dtr */ 1340 1341 static void tell_sector(void) 1342 { 1343 pr_cont(": track %d, head %d, sector %d, size %d", 1344 R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE); 1345 } /* tell_sector */ 1346 1347 static void print_errors(void) 1348 { 1349 DPRINT(""); 1350 if (ST0 & ST0_ECE) { 1351 pr_cont("Recalibrate failed!"); 1352 } else if (ST2 & ST2_CRC) { 1353 pr_cont("data CRC error"); 1354 tell_sector(); 1355 } else if (ST1 & ST1_CRC) { 1356 pr_cont("CRC error"); 1357 tell_sector(); 1358 } else if ((ST1 & (ST1_MAM | ST1_ND)) || 1359 (ST2 & ST2_MAM)) { 1360 if (!probing) { 1361 pr_cont("sector not found"); 1362 tell_sector(); 1363 } else 1364 pr_cont("probe failed..."); 1365 } else if (ST2 & ST2_WC) { /* seek error */ 1366 pr_cont("wrong cylinder"); 1367 } else if (ST2 & ST2_BC) { /* cylinder marked as bad */ 1368 pr_cont("bad cylinder"); 1369 } else { 1370 pr_cont("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x", 1371 ST0, ST1, ST2); 1372 tell_sector(); 1373 } 1374 pr_cont("\n"); 1375 } 1376 1377 /* 1378 * OK, this error interpreting routine is called after a 1379 * DMA read/write has succeeded 1380 * or failed, so we check the results, and copy any buffers. 1381 * hhb: Added better error reporting. 1382 * ak: Made this into a separate routine. 1383 */ 1384 static int interpret_errors(void) 1385 { 1386 char bad; 1387 1388 if (inr != 7) { 1389 DPRINT("-- FDC reply error\n"); 1390 FDCS->reset = 1; 1391 return 1; 1392 } 1393 1394 /* check IC to find cause of interrupt */ 1395 switch (ST0 & ST0_INTR) { 1396 case 0x40: /* error occurred during command execution */ 1397 if (ST1 & ST1_EOC) 1398 return 0; /* occurs with pseudo-DMA */ 1399 bad = 1; 1400 if (ST1 & ST1_WP) { 1401 DPRINT("Drive is write protected\n"); 1402 clear_bit(FD_DISK_WRITABLE_BIT, &DRS->flags); 1403 cont->done(0); 1404 bad = 2; 1405 } else if (ST1 & ST1_ND) { 1406 set_bit(FD_NEED_TWADDLE_BIT, &DRS->flags); 1407 } else if (ST1 & ST1_OR) { 1408 if (DP->flags & FTD_MSG) 1409 DPRINT("Over/Underrun - retrying\n"); 1410 bad = 0; 1411 } else if (*errors >= DP->max_errors.reporting) { 1412 print_errors(); 1413 } 1414 if (ST2 & ST2_WC || ST2 & ST2_BC) 1415 /* wrong cylinder => recal */ 1416 DRS->track = NEED_2_RECAL; 1417 return bad; 1418 case 0x80: /* invalid command given */ 1419 DPRINT("Invalid FDC command given!\n"); 1420 cont->done(0); 1421 return 2; 1422 case 0xc0: 1423 DPRINT("Abnormal termination caused by polling\n"); 1424 cont->error(); 1425 return 2; 1426 default: /* (0) Normal command termination */ 1427 return 0; 1428 } 1429 } 1430 1431 /* 1432 * This routine is called when everything should be correctly set up 1433 * for the transfer (i.e. floppy motor is on, the correct floppy is 1434 * selected, and the head is sitting on the right track). 1435 */ 1436 static void setup_rw_floppy(void) 1437 { 1438 int i; 1439 int r; 1440 int flags; 1441 int dflags; 1442 unsigned long ready_date; 1443 work_func_t function; 1444 1445 flags = raw_cmd->flags; 1446 if (flags & (FD_RAW_READ | FD_RAW_WRITE)) 1447 flags |= FD_RAW_INTR; 1448 1449 if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)) { 1450 ready_date = DRS->spinup_date + DP->spinup; 1451 /* If spinup will take a long time, rerun scandrives 1452 * again just before spinup completion. Beware that 1453 * after scandrives, we must again wait for selection. 1454 */ 1455 if (time_after(ready_date, jiffies + DP->select_delay)) { 1456 ready_date -= DP->select_delay; 1457 function = (work_func_t)floppy_start; 1458 } else 1459 function = (work_func_t)setup_rw_floppy; 1460 1461 /* wait until the floppy is spinning fast enough */ 1462 if (fd_wait_for_completion(ready_date, function)) 1463 return; 1464 } 1465 dflags = DRS->flags; 1466 1467 if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE)) 1468 setup_DMA(); 1469 1470 if (flags & FD_RAW_INTR) 1471 do_floppy = main_command_interrupt; 1472 1473 r = 0; 1474 for (i = 0; i < raw_cmd->cmd_count; i++) 1475 r |= output_byte(raw_cmd->cmd[i]); 1476 1477 debugt(__func__, "rw_command"); 1478 1479 if (r) { 1480 cont->error(); 1481 reset_fdc(); 1482 return; 1483 } 1484 1485 if (!(flags & FD_RAW_INTR)) { 1486 inr = result(); 1487 cont->interrupt(); 1488 } else if (flags & FD_RAW_NEED_DISK) 1489 fd_watchdog(NULL); 1490 } 1491 1492 static int blind_seek; 1493 1494 /* 1495 * This is the routine called after every seek (or recalibrate) interrupt 1496 * from the floppy controller. 1497 */ 1498 static void seek_interrupt(void) 1499 { 1500 debugt(__func__, ""); 1501 if (inr != 2 || (ST0 & 0xF8) != 0x20) { 1502 DPRINT("seek failed\n"); 1503 DRS->track = NEED_2_RECAL; 1504 cont->error(); 1505 cont->redo(); 1506 return; 1507 } 1508 if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek) { 1509 debug_dcl(DP->flags, 1510 "clearing NEWCHANGE flag because of effective seek\n"); 1511 debug_dcl(DP->flags, "jiffies=%lu\n", jiffies); 1512 clear_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags); 1513 /* effective seek */ 1514 DRS->select_date = jiffies; 1515 } 1516 DRS->track = ST1; 1517 floppy_ready(); 1518 } 1519 1520 static void check_wp(void) 1521 { 1522 if (test_bit(FD_VERIFY_BIT, &DRS->flags)) { 1523 /* check write protection */ 1524 output_byte(FD_GETSTATUS); 1525 output_byte(UNIT(current_drive)); 1526 if (result() != 1) { 1527 FDCS->reset = 1; 1528 return; 1529 } 1530 clear_bit(FD_VERIFY_BIT, &DRS->flags); 1531 clear_bit(FD_NEED_TWADDLE_BIT, &DRS->flags); 1532 debug_dcl(DP->flags, 1533 "checking whether disk is write protected\n"); 1534 debug_dcl(DP->flags, "wp=%x\n", ST3 & 0x40); 1535 if (!(ST3 & 0x40)) 1536 set_bit(FD_DISK_WRITABLE_BIT, &DRS->flags); 1537 else 1538 clear_bit(FD_DISK_WRITABLE_BIT, &DRS->flags); 1539 } 1540 } 1541 1542 static void seek_floppy(void) 1543 { 1544 int track; 1545 1546 blind_seek = 0; 1547 1548 debug_dcl(DP->flags, "calling disk change from %s\n", __func__); 1549 1550 if (!test_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags) && 1551 disk_change(current_drive) && (raw_cmd->flags & FD_RAW_NEED_DISK)) { 1552 /* the media changed flag should be cleared after the seek. 1553 * If it isn't, this means that there is really no disk in 1554 * the drive. 1555 */ 1556 set_bit(FD_DISK_CHANGED_BIT, &DRS->flags); 1557 cont->done(0); 1558 cont->redo(); 1559 return; 1560 } 1561 if (DRS->track <= NEED_1_RECAL) { 1562 recalibrate_floppy(); 1563 return; 1564 } else if (test_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags) && 1565 (raw_cmd->flags & FD_RAW_NEED_DISK) && 1566 (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) { 1567 /* we seek to clear the media-changed condition. Does anybody 1568 * know a more elegant way, which works on all drives? */ 1569 if (raw_cmd->track) 1570 track = raw_cmd->track - 1; 1571 else { 1572 if (DP->flags & FD_SILENT_DCL_CLEAR) { 1573 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0); 1574 blind_seek = 1; 1575 raw_cmd->flags |= FD_RAW_NEED_SEEK; 1576 } 1577 track = 1; 1578 } 1579 } else { 1580 check_wp(); 1581 if (raw_cmd->track != DRS->track && 1582 (raw_cmd->flags & FD_RAW_NEED_SEEK)) 1583 track = raw_cmd->track; 1584 else { 1585 setup_rw_floppy(); 1586 return; 1587 } 1588 } 1589 1590 do_floppy = seek_interrupt; 1591 output_byte(FD_SEEK); 1592 output_byte(UNIT(current_drive)); 1593 if (output_byte(track) < 0) { 1594 reset_fdc(); 1595 return; 1596 } 1597 debugt(__func__, ""); 1598 } 1599 1600 static void recal_interrupt(void) 1601 { 1602 debugt(__func__, ""); 1603 if (inr != 2) 1604 FDCS->reset = 1; 1605 else if (ST0 & ST0_ECE) { 1606 switch (DRS->track) { 1607 case NEED_1_RECAL: 1608 debugt(__func__, "need 1 recal"); 1609 /* after a second recalibrate, we still haven't 1610 * reached track 0. Probably no drive. Raise an 1611 * error, as failing immediately might upset 1612 * computers possessed by the Devil :-) */ 1613 cont->error(); 1614 cont->redo(); 1615 return; 1616 case NEED_2_RECAL: 1617 debugt(__func__, "need 2 recal"); 1618 /* If we already did a recalibrate, 1619 * and we are not at track 0, this 1620 * means we have moved. (The only way 1621 * not to move at recalibration is to 1622 * be already at track 0.) Clear the 1623 * new change flag */ 1624 debug_dcl(DP->flags, 1625 "clearing NEWCHANGE flag because of second recalibrate\n"); 1626 1627 clear_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags); 1628 DRS->select_date = jiffies; 1629 /* fall through */ 1630 default: 1631 debugt(__func__, "default"); 1632 /* Recalibrate moves the head by at 1633 * most 80 steps. If after one 1634 * recalibrate we don't have reached 1635 * track 0, this might mean that we 1636 * started beyond track 80. Try 1637 * again. */ 1638 DRS->track = NEED_1_RECAL; 1639 break; 1640 } 1641 } else 1642 DRS->track = ST1; 1643 floppy_ready(); 1644 } 1645 1646 static void print_result(char *message, int inr) 1647 { 1648 int i; 1649 1650 DPRINT("%s ", message); 1651 if (inr >= 0) 1652 for (i = 0; i < inr; i++) 1653 pr_cont("repl[%d]=%x ", i, reply_buffer[i]); 1654 pr_cont("\n"); 1655 } 1656 1657 /* interrupt handler. Note that this can be called externally on the Sparc */ 1658 irqreturn_t floppy_interrupt(int irq, void *dev_id) 1659 { 1660 int do_print; 1661 unsigned long f; 1662 void (*handler)(void) = do_floppy; 1663 1664 lasthandler = handler; 1665 interruptjiffies = jiffies; 1666 1667 f = claim_dma_lock(); 1668 fd_disable_dma(); 1669 release_dma_lock(f); 1670 1671 do_floppy = NULL; 1672 if (fdc >= N_FDC || FDCS->address == -1) { 1673 /* we don't even know which FDC is the culprit */ 1674 pr_info("DOR0=%x\n", fdc_state[0].dor); 1675 pr_info("floppy interrupt on bizarre fdc %d\n", fdc); 1676 pr_info("handler=%pf\n", handler); 1677 is_alive(__func__, "bizarre fdc"); 1678 return IRQ_NONE; 1679 } 1680 1681 FDCS->reset = 0; 1682 /* We have to clear the reset flag here, because apparently on boxes 1683 * with level triggered interrupts (PS/2, Sparc, ...), it is needed to 1684 * emit SENSEI's to clear the interrupt line. And FDCS->reset blocks the 1685 * emission of the SENSEI's. 1686 * It is OK to emit floppy commands because we are in an interrupt 1687 * handler here, and thus we have to fear no interference of other 1688 * activity. 1689 */ 1690 1691 do_print = !handler && print_unex && initialized; 1692 1693 inr = result(); 1694 if (do_print) 1695 print_result("unexpected interrupt", inr); 1696 if (inr == 0) { 1697 int max_sensei = 4; 1698 do { 1699 output_byte(FD_SENSEI); 1700 inr = result(); 1701 if (do_print) 1702 print_result("sensei", inr); 1703 max_sensei--; 1704 } while ((ST0 & 0x83) != UNIT(current_drive) && 1705 inr == 2 && max_sensei); 1706 } 1707 if (!handler) { 1708 FDCS->reset = 1; 1709 return IRQ_NONE; 1710 } 1711 schedule_bh(handler); 1712 is_alive(__func__, "normal interrupt end"); 1713 1714 /* FIXME! Was it really for us? */ 1715 return IRQ_HANDLED; 1716 } 1717 1718 static void recalibrate_floppy(void) 1719 { 1720 debugt(__func__, ""); 1721 do_floppy = recal_interrupt; 1722 output_byte(FD_RECALIBRATE); 1723 if (output_byte(UNIT(current_drive)) < 0) 1724 reset_fdc(); 1725 } 1726 1727 /* 1728 * Must do 4 FD_SENSEIs after reset because of ``drive polling''. 1729 */ 1730 static void reset_interrupt(void) 1731 { 1732 debugt(__func__, ""); 1733 result(); /* get the status ready for set_fdc */ 1734 if (FDCS->reset) { 1735 pr_info("reset set in interrupt, calling %pf\n", cont->error); 1736 cont->error(); /* a reset just after a reset. BAD! */ 1737 } 1738 cont->redo(); 1739 } 1740 1741 /* 1742 * reset is done by pulling bit 2 of DOR low for a while (old FDCs), 1743 * or by setting the self clearing bit 7 of STATUS (newer FDCs) 1744 */ 1745 static void reset_fdc(void) 1746 { 1747 unsigned long flags; 1748 1749 do_floppy = reset_interrupt; 1750 FDCS->reset = 0; 1751 reset_fdc_info(0); 1752 1753 /* Pseudo-DMA may intercept 'reset finished' interrupt. */ 1754 /* Irrelevant for systems with true DMA (i386). */ 1755 1756 flags = claim_dma_lock(); 1757 fd_disable_dma(); 1758 release_dma_lock(flags); 1759 1760 if (FDCS->version >= FDC_82072A) 1761 fd_outb(0x80 | (FDCS->dtr & 3), FD_STATUS); 1762 else { 1763 fd_outb(FDCS->dor & ~0x04, FD_DOR); 1764 udelay(FD_RESET_DELAY); 1765 fd_outb(FDCS->dor, FD_DOR); 1766 } 1767 } 1768 1769 static void show_floppy(void) 1770 { 1771 int i; 1772 1773 pr_info("\n"); 1774 pr_info("floppy driver state\n"); 1775 pr_info("-------------------\n"); 1776 pr_info("now=%lu last interrupt=%lu diff=%lu last called handler=%pf\n", 1777 jiffies, interruptjiffies, jiffies - interruptjiffies, 1778 lasthandler); 1779 1780 pr_info("timeout_message=%s\n", timeout_message); 1781 pr_info("last output bytes:\n"); 1782 for (i = 0; i < OLOGSIZE; i++) 1783 pr_info("%2x %2x %lu\n", 1784 output_log[(i + output_log_pos) % OLOGSIZE].data, 1785 output_log[(i + output_log_pos) % OLOGSIZE].status, 1786 output_log[(i + output_log_pos) % OLOGSIZE].jiffies); 1787 pr_info("last result at %lu\n", resultjiffies); 1788 pr_info("last redo_fd_request at %lu\n", lastredo); 1789 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1, 1790 reply_buffer, resultsize, true); 1791 1792 pr_info("status=%x\n", fd_inb(FD_STATUS)); 1793 pr_info("fdc_busy=%lu\n", fdc_busy); 1794 if (do_floppy) 1795 pr_info("do_floppy=%pf\n", do_floppy); 1796 if (work_pending(&floppy_work)) 1797 pr_info("floppy_work.func=%pf\n", floppy_work.func); 1798 if (delayed_work_pending(&fd_timer)) 1799 pr_info("delayed work.function=%p expires=%ld\n", 1800 fd_timer.work.func, 1801 fd_timer.timer.expires - jiffies); 1802 if (delayed_work_pending(&fd_timeout)) 1803 pr_info("timer_function=%p expires=%ld\n", 1804 fd_timeout.work.func, 1805 fd_timeout.timer.expires - jiffies); 1806 1807 pr_info("cont=%p\n", cont); 1808 pr_info("current_req=%p\n", current_req); 1809 pr_info("command_status=%d\n", command_status); 1810 pr_info("\n"); 1811 } 1812 1813 static void floppy_shutdown(struct work_struct *arg) 1814 { 1815 unsigned long flags; 1816 1817 if (initialized) 1818 show_floppy(); 1819 cancel_activity(); 1820 1821 flags = claim_dma_lock(); 1822 fd_disable_dma(); 1823 release_dma_lock(flags); 1824 1825 /* avoid dma going to a random drive after shutdown */ 1826 1827 if (initialized) 1828 DPRINT("floppy timeout called\n"); 1829 FDCS->reset = 1; 1830 if (cont) { 1831 cont->done(0); 1832 cont->redo(); /* this will recall reset when needed */ 1833 } else { 1834 pr_info("no cont in shutdown!\n"); 1835 process_fd_request(); 1836 } 1837 is_alive(__func__, ""); 1838 } 1839 1840 /* start motor, check media-changed condition and write protection */ 1841 static int start_motor(void (*function)(void)) 1842 { 1843 int mask; 1844 int data; 1845 1846 mask = 0xfc; 1847 data = UNIT(current_drive); 1848 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)) { 1849 if (!(FDCS->dor & (0x10 << UNIT(current_drive)))) { 1850 set_debugt(); 1851 /* no read since this drive is running */ 1852 DRS->first_read_date = 0; 1853 /* note motor start time if motor is not yet running */ 1854 DRS->spinup_date = jiffies; 1855 data |= (0x10 << UNIT(current_drive)); 1856 } 1857 } else if (FDCS->dor & (0x10 << UNIT(current_drive))) 1858 mask &= ~(0x10 << UNIT(current_drive)); 1859 1860 /* starts motor and selects floppy */ 1861 del_timer(motor_off_timer + current_drive); 1862 set_dor(fdc, mask, data); 1863 1864 /* wait_for_completion also schedules reset if needed. */ 1865 return fd_wait_for_completion(DRS->select_date + DP->select_delay, 1866 (work_func_t)function); 1867 } 1868 1869 static void floppy_ready(void) 1870 { 1871 if (FDCS->reset) { 1872 reset_fdc(); 1873 return; 1874 } 1875 if (start_motor(floppy_ready)) 1876 return; 1877 if (fdc_dtr()) 1878 return; 1879 1880 debug_dcl(DP->flags, "calling disk change from floppy_ready\n"); 1881 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) && 1882 disk_change(current_drive) && !DP->select_delay) 1883 twaddle(); /* this clears the dcl on certain 1884 * drive/controller combinations */ 1885 1886 #ifdef fd_chose_dma_mode 1887 if ((raw_cmd->flags & FD_RAW_READ) || (raw_cmd->flags & FD_RAW_WRITE)) { 1888 unsigned long flags = claim_dma_lock(); 1889 fd_chose_dma_mode(raw_cmd->kernel_data, raw_cmd->length); 1890 release_dma_lock(flags); 1891 } 1892 #endif 1893 1894 if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)) { 1895 perpendicular_mode(); 1896 fdc_specify(); /* must be done here because of hut, hlt ... */ 1897 seek_floppy(); 1898 } else { 1899 if ((raw_cmd->flags & FD_RAW_READ) || 1900 (raw_cmd->flags & FD_RAW_WRITE)) 1901 fdc_specify(); 1902 setup_rw_floppy(); 1903 } 1904 } 1905 1906 static void floppy_start(void) 1907 { 1908 reschedule_timeout(current_reqD, "floppy start"); 1909 1910 scandrives(); 1911 debug_dcl(DP->flags, "setting NEWCHANGE in floppy_start\n"); 1912 set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags); 1913 floppy_ready(); 1914 } 1915 1916 /* 1917 * ======================================================================== 1918 * here ends the bottom half. Exported routines are: 1919 * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc, 1920 * start_motor, reset_fdc, reset_fdc_info, interpret_errors. 1921 * Initialization also uses output_byte, result, set_dor, floppy_interrupt 1922 * and set_dor. 1923 * ======================================================================== 1924 */ 1925 /* 1926 * General purpose continuations. 1927 * ============================== 1928 */ 1929 1930 static void do_wakeup(void) 1931 { 1932 reschedule_timeout(MAXTIMEOUT, "do wakeup"); 1933 cont = NULL; 1934 command_status += 2; 1935 wake_up(&command_done); 1936 } 1937 1938 static const struct cont_t wakeup_cont = { 1939 .interrupt = empty, 1940 .redo = do_wakeup, 1941 .error = empty, 1942 .done = (done_f)empty 1943 }; 1944 1945 static const struct cont_t intr_cont = { 1946 .interrupt = empty, 1947 .redo = process_fd_request, 1948 .error = empty, 1949 .done = (done_f)empty 1950 }; 1951 1952 static int wait_til_done(void (*handler)(void), bool interruptible) 1953 { 1954 int ret; 1955 1956 schedule_bh(handler); 1957 1958 if (interruptible) 1959 wait_event_interruptible(command_done, command_status >= 2); 1960 else 1961 wait_event(command_done, command_status >= 2); 1962 1963 if (command_status < 2) { 1964 cancel_activity(); 1965 cont = &intr_cont; 1966 reset_fdc(); 1967 return -EINTR; 1968 } 1969 1970 if (FDCS->reset) 1971 command_status = FD_COMMAND_ERROR; 1972 if (command_status == FD_COMMAND_OKAY) 1973 ret = 0; 1974 else 1975 ret = -EIO; 1976 command_status = FD_COMMAND_NONE; 1977 return ret; 1978 } 1979 1980 static void generic_done(int result) 1981 { 1982 command_status = result; 1983 cont = &wakeup_cont; 1984 } 1985 1986 static void generic_success(void) 1987 { 1988 cont->done(1); 1989 } 1990 1991 static void generic_failure(void) 1992 { 1993 cont->done(0); 1994 } 1995 1996 static void success_and_wakeup(void) 1997 { 1998 generic_success(); 1999 cont->redo(); 2000 } 2001 2002 /* 2003 * formatting and rw support. 2004 * ========================== 2005 */ 2006 2007 static int next_valid_format(void) 2008 { 2009 int probed_format; 2010 2011 probed_format = DRS->probed_format; 2012 while (1) { 2013 if (probed_format >= 8 || !DP->autodetect[probed_format]) { 2014 DRS->probed_format = 0; 2015 return 1; 2016 } 2017 if (floppy_type[DP->autodetect[probed_format]].sect) { 2018 DRS->probed_format = probed_format; 2019 return 0; 2020 } 2021 probed_format++; 2022 } 2023 } 2024 2025 static void bad_flp_intr(void) 2026 { 2027 int err_count; 2028 2029 if (probing) { 2030 DRS->probed_format++; 2031 if (!next_valid_format()) 2032 return; 2033 } 2034 err_count = ++(*errors); 2035 INFBOUND(DRWE->badness, err_count); 2036 if (err_count > DP->max_errors.abort) 2037 cont->done(0); 2038 if (err_count > DP->max_errors.reset) 2039 FDCS->reset = 1; 2040 else if (err_count > DP->max_errors.recal) 2041 DRS->track = NEED_2_RECAL; 2042 } 2043 2044 static void set_floppy(int drive) 2045 { 2046 int type = ITYPE(UDRS->fd_device); 2047 2048 if (type) 2049 _floppy = floppy_type + type; 2050 else 2051 _floppy = current_type[drive]; 2052 } 2053 2054 /* 2055 * formatting support. 2056 * =================== 2057 */ 2058 static void format_interrupt(void) 2059 { 2060 switch (interpret_errors()) { 2061 case 1: 2062 cont->error(); 2063 case 2: 2064 break; 2065 case 0: 2066 cont->done(1); 2067 } 2068 cont->redo(); 2069 } 2070 2071 #define FM_MODE(x, y) ((y) & ~(((x)->rate & 0x80) >> 1)) 2072 #define CT(x) ((x) | 0xc0) 2073 2074 static void setup_format_params(int track) 2075 { 2076 int n; 2077 int il; 2078 int count; 2079 int head_shift; 2080 int track_shift; 2081 struct fparm { 2082 unsigned char track, head, sect, size; 2083 } *here = (struct fparm *)floppy_track_buffer; 2084 2085 raw_cmd = &default_raw_cmd; 2086 raw_cmd->track = track; 2087 2088 raw_cmd->flags = (FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN | 2089 FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK); 2090 raw_cmd->rate = _floppy->rate & 0x43; 2091 raw_cmd->cmd_count = NR_F; 2092 COMMAND = FM_MODE(_floppy, FD_FORMAT); 2093 DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, format_req.head); 2094 F_SIZECODE = FD_SIZECODE(_floppy); 2095 F_SECT_PER_TRACK = _floppy->sect << 2 >> F_SIZECODE; 2096 F_GAP = _floppy->fmt_gap; 2097 F_FILL = FD_FILL_BYTE; 2098 2099 raw_cmd->kernel_data = floppy_track_buffer; 2100 raw_cmd->length = 4 * F_SECT_PER_TRACK; 2101 2102 /* allow for about 30ms for data transport per track */ 2103 head_shift = (F_SECT_PER_TRACK + 5) / 6; 2104 2105 /* a ``cylinder'' is two tracks plus a little stepping time */ 2106 track_shift = 2 * head_shift + 3; 2107 2108 /* position of logical sector 1 on this track */ 2109 n = (track_shift * format_req.track + head_shift * format_req.head) 2110 % F_SECT_PER_TRACK; 2111 2112 /* determine interleave */ 2113 il = 1; 2114 if (_floppy->fmt_gap < 0x22) 2115 il++; 2116 2117 /* initialize field */ 2118 for (count = 0; count < F_SECT_PER_TRACK; ++count) { 2119 here[count].track = format_req.track; 2120 here[count].head = format_req.head; 2121 here[count].sect = 0; 2122 here[count].size = F_SIZECODE; 2123 } 2124 /* place logical sectors */ 2125 for (count = 1; count <= F_SECT_PER_TRACK; ++count) { 2126 here[n].sect = count; 2127 n = (n + il) % F_SECT_PER_TRACK; 2128 if (here[n].sect) { /* sector busy, find next free sector */ 2129 ++n; 2130 if (n >= F_SECT_PER_TRACK) { 2131 n -= F_SECT_PER_TRACK; 2132 while (here[n].sect) 2133 ++n; 2134 } 2135 } 2136 } 2137 if (_floppy->stretch & FD_SECTBASEMASK) { 2138 for (count = 0; count < F_SECT_PER_TRACK; count++) 2139 here[count].sect += FD_SECTBASE(_floppy) - 1; 2140 } 2141 } 2142 2143 static void redo_format(void) 2144 { 2145 buffer_track = -1; 2146 setup_format_params(format_req.track << STRETCH(_floppy)); 2147 floppy_start(); 2148 debugt(__func__, "queue format request"); 2149 } 2150 2151 static const struct cont_t format_cont = { 2152 .interrupt = format_interrupt, 2153 .redo = redo_format, 2154 .error = bad_flp_intr, 2155 .done = generic_done 2156 }; 2157 2158 static int do_format(int drive, struct format_descr *tmp_format_req) 2159 { 2160 int ret; 2161 2162 if (lock_fdc(drive, true)) 2163 return -EINTR; 2164 2165 set_floppy(drive); 2166 if (!_floppy || 2167 _floppy->track > DP->tracks || 2168 tmp_format_req->track >= _floppy->track || 2169 tmp_format_req->head >= _floppy->head || 2170 (_floppy->sect << 2) % (1 << FD_SIZECODE(_floppy)) || 2171 !_floppy->fmt_gap) { 2172 process_fd_request(); 2173 return -EINVAL; 2174 } 2175 format_req = *tmp_format_req; 2176 format_errors = 0; 2177 cont = &format_cont; 2178 errors = &format_errors; 2179 ret = wait_til_done(redo_format, true); 2180 if (ret == -EINTR) 2181 return -EINTR; 2182 process_fd_request(); 2183 return ret; 2184 } 2185 2186 /* 2187 * Buffer read/write and support 2188 * ============================= 2189 */ 2190 2191 static void floppy_end_request(struct request *req, int error) 2192 { 2193 unsigned int nr_sectors = current_count_sectors; 2194 unsigned int drive = (unsigned long)req->rq_disk->private_data; 2195 2196 /* current_count_sectors can be zero if transfer failed */ 2197 if (error) 2198 nr_sectors = blk_rq_cur_sectors(req); 2199 if (__blk_end_request(req, error, nr_sectors << 9)) 2200 return; 2201 2202 /* We're done with the request */ 2203 floppy_off(drive); 2204 current_req = NULL; 2205 } 2206 2207 /* new request_done. Can handle physical sectors which are smaller than a 2208 * logical buffer */ 2209 static void request_done(int uptodate) 2210 { 2211 struct request *req = current_req; 2212 struct request_queue *q; 2213 unsigned long flags; 2214 int block; 2215 char msg[sizeof("request done ") + sizeof(int) * 3]; 2216 2217 probing = 0; 2218 snprintf(msg, sizeof(msg), "request done %d", uptodate); 2219 reschedule_timeout(MAXTIMEOUT, msg); 2220 2221 if (!req) { 2222 pr_info("floppy.c: no request in request_done\n"); 2223 return; 2224 } 2225 2226 q = req->q; 2227 2228 if (uptodate) { 2229 /* maintain values for invalidation on geometry 2230 * change */ 2231 block = current_count_sectors + blk_rq_pos(req); 2232 INFBOUND(DRS->maxblock, block); 2233 if (block > _floppy->sect) 2234 DRS->maxtrack = 1; 2235 2236 /* unlock chained buffers */ 2237 spin_lock_irqsave(q->queue_lock, flags); 2238 floppy_end_request(req, 0); 2239 spin_unlock_irqrestore(q->queue_lock, flags); 2240 } else { 2241 if (rq_data_dir(req) == WRITE) { 2242 /* record write error information */ 2243 DRWE->write_errors++; 2244 if (DRWE->write_errors == 1) { 2245 DRWE->first_error_sector = blk_rq_pos(req); 2246 DRWE->first_error_generation = DRS->generation; 2247 } 2248 DRWE->last_error_sector = blk_rq_pos(req); 2249 DRWE->last_error_generation = DRS->generation; 2250 } 2251 spin_lock_irqsave(q->queue_lock, flags); 2252 floppy_end_request(req, -EIO); 2253 spin_unlock_irqrestore(q->queue_lock, flags); 2254 } 2255 } 2256 2257 /* Interrupt handler evaluating the result of the r/w operation */ 2258 static void rw_interrupt(void) 2259 { 2260 int eoc; 2261 int ssize; 2262 int heads; 2263 int nr_sectors; 2264 2265 if (R_HEAD >= 2) { 2266 /* some Toshiba floppy controllers occasionnally seem to 2267 * return bogus interrupts after read/write operations, which 2268 * can be recognized by a bad head number (>= 2) */ 2269 return; 2270 } 2271 2272 if (!DRS->first_read_date) 2273 DRS->first_read_date = jiffies; 2274 2275 nr_sectors = 0; 2276 ssize = DIV_ROUND_UP(1 << SIZECODE, 4); 2277 2278 if (ST1 & ST1_EOC) 2279 eoc = 1; 2280 else 2281 eoc = 0; 2282 2283 if (COMMAND & 0x80) 2284 heads = 2; 2285 else 2286 heads = 1; 2287 2288 nr_sectors = (((R_TRACK - TRACK) * heads + 2289 R_HEAD - HEAD) * SECT_PER_TRACK + 2290 R_SECTOR - SECTOR + eoc) << SIZECODE >> 2; 2291 2292 if (nr_sectors / ssize > 2293 DIV_ROUND_UP(in_sector_offset + current_count_sectors, ssize)) { 2294 DPRINT("long rw: %x instead of %lx\n", 2295 nr_sectors, current_count_sectors); 2296 pr_info("rs=%d s=%d\n", R_SECTOR, SECTOR); 2297 pr_info("rh=%d h=%d\n", R_HEAD, HEAD); 2298 pr_info("rt=%d t=%d\n", R_TRACK, TRACK); 2299 pr_info("heads=%d eoc=%d\n", heads, eoc); 2300 pr_info("spt=%d st=%d ss=%d\n", 2301 SECT_PER_TRACK, fsector_t, ssize); 2302 pr_info("in_sector_offset=%d\n", in_sector_offset); 2303 } 2304 2305 nr_sectors -= in_sector_offset; 2306 INFBOUND(nr_sectors, 0); 2307 SUPBOUND(current_count_sectors, nr_sectors); 2308 2309 switch (interpret_errors()) { 2310 case 2: 2311 cont->redo(); 2312 return; 2313 case 1: 2314 if (!current_count_sectors) { 2315 cont->error(); 2316 cont->redo(); 2317 return; 2318 } 2319 break; 2320 case 0: 2321 if (!current_count_sectors) { 2322 cont->redo(); 2323 return; 2324 } 2325 current_type[current_drive] = _floppy; 2326 floppy_sizes[TOMINOR(current_drive)] = _floppy->size; 2327 break; 2328 } 2329 2330 if (probing) { 2331 if (DP->flags & FTD_MSG) 2332 DPRINT("Auto-detected floppy type %s in fd%d\n", 2333 _floppy->name, current_drive); 2334 current_type[current_drive] = _floppy; 2335 floppy_sizes[TOMINOR(current_drive)] = _floppy->size; 2336 probing = 0; 2337 } 2338 2339 if (CT(COMMAND) != FD_READ || 2340 raw_cmd->kernel_data == current_req->buffer) { 2341 /* transfer directly from buffer */ 2342 cont->done(1); 2343 } else if (CT(COMMAND) == FD_READ) { 2344 buffer_track = raw_cmd->track; 2345 buffer_drive = current_drive; 2346 INFBOUND(buffer_max, nr_sectors + fsector_t); 2347 } 2348 cont->redo(); 2349 } 2350 2351 /* Compute maximal contiguous buffer size. */ 2352 static int buffer_chain_size(void) 2353 { 2354 struct bio_vec *bv; 2355 int size; 2356 struct req_iterator iter; 2357 char *base; 2358 2359 base = bio_data(current_req->bio); 2360 size = 0; 2361 2362 rq_for_each_segment(bv, current_req, iter) { 2363 if (page_address(bv->bv_page) + bv->bv_offset != base + size) 2364 break; 2365 2366 size += bv->bv_len; 2367 } 2368 2369 return size >> 9; 2370 } 2371 2372 /* Compute the maximal transfer size */ 2373 static int transfer_size(int ssize, int max_sector, int max_size) 2374 { 2375 SUPBOUND(max_sector, fsector_t + max_size); 2376 2377 /* alignment */ 2378 max_sector -= (max_sector % _floppy->sect) % ssize; 2379 2380 /* transfer size, beginning not aligned */ 2381 current_count_sectors = max_sector - fsector_t; 2382 2383 return max_sector; 2384 } 2385 2386 /* 2387 * Move data from/to the track buffer to/from the buffer cache. 2388 */ 2389 static void copy_buffer(int ssize, int max_sector, int max_sector_2) 2390 { 2391 int remaining; /* number of transferred 512-byte sectors */ 2392 struct bio_vec *bv; 2393 char *buffer; 2394 char *dma_buffer; 2395 int size; 2396 struct req_iterator iter; 2397 2398 max_sector = transfer_size(ssize, 2399 min(max_sector, max_sector_2), 2400 blk_rq_sectors(current_req)); 2401 2402 if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE && 2403 buffer_max > fsector_t + blk_rq_sectors(current_req)) 2404 current_count_sectors = min_t(int, buffer_max - fsector_t, 2405 blk_rq_sectors(current_req)); 2406 2407 remaining = current_count_sectors << 9; 2408 if (remaining > blk_rq_bytes(current_req) && CT(COMMAND) == FD_WRITE) { 2409 DPRINT("in copy buffer\n"); 2410 pr_info("current_count_sectors=%ld\n", current_count_sectors); 2411 pr_info("remaining=%d\n", remaining >> 9); 2412 pr_info("current_req->nr_sectors=%u\n", 2413 blk_rq_sectors(current_req)); 2414 pr_info("current_req->current_nr_sectors=%u\n", 2415 blk_rq_cur_sectors(current_req)); 2416 pr_info("max_sector=%d\n", max_sector); 2417 pr_info("ssize=%d\n", ssize); 2418 } 2419 2420 buffer_max = max(max_sector, buffer_max); 2421 2422 dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9); 2423 2424 size = blk_rq_cur_bytes(current_req); 2425 2426 rq_for_each_segment(bv, current_req, iter) { 2427 if (!remaining) 2428 break; 2429 2430 size = bv->bv_len; 2431 SUPBOUND(size, remaining); 2432 2433 buffer = page_address(bv->bv_page) + bv->bv_offset; 2434 if (dma_buffer + size > 2435 floppy_track_buffer + (max_buffer_sectors << 10) || 2436 dma_buffer < floppy_track_buffer) { 2437 DPRINT("buffer overrun in copy buffer %d\n", 2438 (int)((floppy_track_buffer - dma_buffer) >> 9)); 2439 pr_info("fsector_t=%d buffer_min=%d\n", 2440 fsector_t, buffer_min); 2441 pr_info("current_count_sectors=%ld\n", 2442 current_count_sectors); 2443 if (CT(COMMAND) == FD_READ) 2444 pr_info("read\n"); 2445 if (CT(COMMAND) == FD_WRITE) 2446 pr_info("write\n"); 2447 break; 2448 } 2449 if (((unsigned long)buffer) % 512) 2450 DPRINT("%p buffer not aligned\n", buffer); 2451 2452 if (CT(COMMAND) == FD_READ) 2453 memcpy(buffer, dma_buffer, size); 2454 else 2455 memcpy(dma_buffer, buffer, size); 2456 2457 remaining -= size; 2458 dma_buffer += size; 2459 } 2460 if (remaining) { 2461 if (remaining > 0) 2462 max_sector -= remaining >> 9; 2463 DPRINT("weirdness: remaining %d\n", remaining >> 9); 2464 } 2465 } 2466 2467 /* work around a bug in pseudo DMA 2468 * (on some FDCs) pseudo DMA does not stop when the CPU stops 2469 * sending data. Hence we need a different way to signal the 2470 * transfer length: We use SECT_PER_TRACK. Unfortunately, this 2471 * does not work with MT, hence we can only transfer one head at 2472 * a time 2473 */ 2474 static void virtualdmabug_workaround(void) 2475 { 2476 int hard_sectors; 2477 int end_sector; 2478 2479 if (CT(COMMAND) == FD_WRITE) { 2480 COMMAND &= ~0x80; /* switch off multiple track mode */ 2481 2482 hard_sectors = raw_cmd->length >> (7 + SIZECODE); 2483 end_sector = SECTOR + hard_sectors - 1; 2484 if (end_sector > SECT_PER_TRACK) { 2485 pr_info("too many sectors %d > %d\n", 2486 end_sector, SECT_PER_TRACK); 2487 return; 2488 } 2489 SECT_PER_TRACK = end_sector; 2490 /* make sure SECT_PER_TRACK 2491 * points to end of transfer */ 2492 } 2493 } 2494 2495 /* 2496 * Formulate a read/write request. 2497 * this routine decides where to load the data (directly to buffer, or to 2498 * tmp floppy area), how much data to load (the size of the buffer, the whole 2499 * track, or a single sector) 2500 * All floppy_track_buffer handling goes in here. If we ever add track buffer 2501 * allocation on the fly, it should be done here. No other part should need 2502 * modification. 2503 */ 2504 2505 static int make_raw_rw_request(void) 2506 { 2507 int aligned_sector_t; 2508 int max_sector; 2509 int max_size; 2510 int tracksize; 2511 int ssize; 2512 2513 if (WARN(max_buffer_sectors == 0, "VFS: Block I/O scheduled on unopened device\n")) 2514 return 0; 2515 2516 set_fdc((long)current_req->rq_disk->private_data); 2517 2518 raw_cmd = &default_raw_cmd; 2519 raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK | 2520 FD_RAW_NEED_SEEK; 2521 raw_cmd->cmd_count = NR_RW; 2522 if (rq_data_dir(current_req) == READ) { 2523 raw_cmd->flags |= FD_RAW_READ; 2524 COMMAND = FM_MODE(_floppy, FD_READ); 2525 } else if (rq_data_dir(current_req) == WRITE) { 2526 raw_cmd->flags |= FD_RAW_WRITE; 2527 COMMAND = FM_MODE(_floppy, FD_WRITE); 2528 } else { 2529 DPRINT("%s: unknown command\n", __func__); 2530 return 0; 2531 } 2532 2533 max_sector = _floppy->sect * _floppy->head; 2534 2535 TRACK = (int)blk_rq_pos(current_req) / max_sector; 2536 fsector_t = (int)blk_rq_pos(current_req) % max_sector; 2537 if (_floppy->track && TRACK >= _floppy->track) { 2538 if (blk_rq_cur_sectors(current_req) & 1) { 2539 current_count_sectors = 1; 2540 return 1; 2541 } else 2542 return 0; 2543 } 2544 HEAD = fsector_t / _floppy->sect; 2545 2546 if (((_floppy->stretch & (FD_SWAPSIDES | FD_SECTBASEMASK)) || 2547 test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags)) && 2548 fsector_t < _floppy->sect) 2549 max_sector = _floppy->sect; 2550 2551 /* 2M disks have phantom sectors on the first track */ 2552 if ((_floppy->rate & FD_2M) && (!TRACK) && (!HEAD)) { 2553 max_sector = 2 * _floppy->sect / 3; 2554 if (fsector_t >= max_sector) { 2555 current_count_sectors = 2556 min_t(int, _floppy->sect - fsector_t, 2557 blk_rq_sectors(current_req)); 2558 return 1; 2559 } 2560 SIZECODE = 2; 2561 } else 2562 SIZECODE = FD_SIZECODE(_floppy); 2563 raw_cmd->rate = _floppy->rate & 0x43; 2564 if ((_floppy->rate & FD_2M) && (TRACK || HEAD) && raw_cmd->rate == 2) 2565 raw_cmd->rate = 1; 2566 2567 if (SIZECODE) 2568 SIZECODE2 = 0xff; 2569 else 2570 SIZECODE2 = 0x80; 2571 raw_cmd->track = TRACK << STRETCH(_floppy); 2572 DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, HEAD); 2573 GAP = _floppy->gap; 2574 ssize = DIV_ROUND_UP(1 << SIZECODE, 4); 2575 SECT_PER_TRACK = _floppy->sect << 2 >> SIZECODE; 2576 SECTOR = ((fsector_t % _floppy->sect) << 2 >> SIZECODE) + 2577 FD_SECTBASE(_floppy); 2578 2579 /* tracksize describes the size which can be filled up with sectors 2580 * of size ssize. 2581 */ 2582 tracksize = _floppy->sect - _floppy->sect % ssize; 2583 if (tracksize < _floppy->sect) { 2584 SECT_PER_TRACK++; 2585 if (tracksize <= fsector_t % _floppy->sect) 2586 SECTOR--; 2587 2588 /* if we are beyond tracksize, fill up using smaller sectors */ 2589 while (tracksize <= fsector_t % _floppy->sect) { 2590 while (tracksize + ssize > _floppy->sect) { 2591 SIZECODE--; 2592 ssize >>= 1; 2593 } 2594 SECTOR++; 2595 SECT_PER_TRACK++; 2596 tracksize += ssize; 2597 } 2598 max_sector = HEAD * _floppy->sect + tracksize; 2599 } else if (!TRACK && !HEAD && !(_floppy->rate & FD_2M) && probing) { 2600 max_sector = _floppy->sect; 2601 } else if (!HEAD && CT(COMMAND) == FD_WRITE) { 2602 /* for virtual DMA bug workaround */ 2603 max_sector = _floppy->sect; 2604 } 2605 2606 in_sector_offset = (fsector_t % _floppy->sect) % ssize; 2607 aligned_sector_t = fsector_t - in_sector_offset; 2608 max_size = blk_rq_sectors(current_req); 2609 if ((raw_cmd->track == buffer_track) && 2610 (current_drive == buffer_drive) && 2611 (fsector_t >= buffer_min) && (fsector_t < buffer_max)) { 2612 /* data already in track buffer */ 2613 if (CT(COMMAND) == FD_READ) { 2614 copy_buffer(1, max_sector, buffer_max); 2615 return 1; 2616 } 2617 } else if (in_sector_offset || blk_rq_sectors(current_req) < ssize) { 2618 if (CT(COMMAND) == FD_WRITE) { 2619 unsigned int sectors; 2620 2621 sectors = fsector_t + blk_rq_sectors(current_req); 2622 if (sectors > ssize && sectors < ssize + ssize) 2623 max_size = ssize + ssize; 2624 else 2625 max_size = ssize; 2626 } 2627 raw_cmd->flags &= ~FD_RAW_WRITE; 2628 raw_cmd->flags |= FD_RAW_READ; 2629 COMMAND = FM_MODE(_floppy, FD_READ); 2630 } else if ((unsigned long)current_req->buffer < MAX_DMA_ADDRESS) { 2631 unsigned long dma_limit; 2632 int direct, indirect; 2633 2634 indirect = 2635 transfer_size(ssize, max_sector, 2636 max_buffer_sectors * 2) - fsector_t; 2637 2638 /* 2639 * Do NOT use minimum() here---MAX_DMA_ADDRESS is 64 bits wide 2640 * on a 64 bit machine! 2641 */ 2642 max_size = buffer_chain_size(); 2643 dma_limit = (MAX_DMA_ADDRESS - 2644 ((unsigned long)current_req->buffer)) >> 9; 2645 if ((unsigned long)max_size > dma_limit) 2646 max_size = dma_limit; 2647 /* 64 kb boundaries */ 2648 if (CROSS_64KB(current_req->buffer, max_size << 9)) 2649 max_size = (K_64 - 2650 ((unsigned long)current_req->buffer) % 2651 K_64) >> 9; 2652 direct = transfer_size(ssize, max_sector, max_size) - fsector_t; 2653 /* 2654 * We try to read tracks, but if we get too many errors, we 2655 * go back to reading just one sector at a time. 2656 * 2657 * This means we should be able to read a sector even if there 2658 * are other bad sectors on this track. 2659 */ 2660 if (!direct || 2661 (indirect * 2 > direct * 3 && 2662 *errors < DP->max_errors.read_track && 2663 ((!probing || 2664 (DP->read_track & (1 << DRS->probed_format)))))) { 2665 max_size = blk_rq_sectors(current_req); 2666 } else { 2667 raw_cmd->kernel_data = current_req->buffer; 2668 raw_cmd->length = current_count_sectors << 9; 2669 if (raw_cmd->length == 0) { 2670 DPRINT("%s: zero dma transfer attempted\n", __func__); 2671 DPRINT("indirect=%d direct=%d fsector_t=%d\n", 2672 indirect, direct, fsector_t); 2673 return 0; 2674 } 2675 virtualdmabug_workaround(); 2676 return 2; 2677 } 2678 } 2679 2680 if (CT(COMMAND) == FD_READ) 2681 max_size = max_sector; /* unbounded */ 2682 2683 /* claim buffer track if needed */ 2684 if (buffer_track != raw_cmd->track || /* bad track */ 2685 buffer_drive != current_drive || /* bad drive */ 2686 fsector_t > buffer_max || 2687 fsector_t < buffer_min || 2688 ((CT(COMMAND) == FD_READ || 2689 (!in_sector_offset && blk_rq_sectors(current_req) >= ssize)) && 2690 max_sector > 2 * max_buffer_sectors + buffer_min && 2691 max_size + fsector_t > 2 * max_buffer_sectors + buffer_min)) { 2692 /* not enough space */ 2693 buffer_track = -1; 2694 buffer_drive = current_drive; 2695 buffer_max = buffer_min = aligned_sector_t; 2696 } 2697 raw_cmd->kernel_data = floppy_track_buffer + 2698 ((aligned_sector_t - buffer_min) << 9); 2699 2700 if (CT(COMMAND) == FD_WRITE) { 2701 /* copy write buffer to track buffer. 2702 * if we get here, we know that the write 2703 * is either aligned or the data already in the buffer 2704 * (buffer will be overwritten) */ 2705 if (in_sector_offset && buffer_track == -1) 2706 DPRINT("internal error offset !=0 on write\n"); 2707 buffer_track = raw_cmd->track; 2708 buffer_drive = current_drive; 2709 copy_buffer(ssize, max_sector, 2710 2 * max_buffer_sectors + buffer_min); 2711 } else 2712 transfer_size(ssize, max_sector, 2713 2 * max_buffer_sectors + buffer_min - 2714 aligned_sector_t); 2715 2716 /* round up current_count_sectors to get dma xfer size */ 2717 raw_cmd->length = in_sector_offset + current_count_sectors; 2718 raw_cmd->length = ((raw_cmd->length - 1) | (ssize - 1)) + 1; 2719 raw_cmd->length <<= 9; 2720 if ((raw_cmd->length < current_count_sectors << 9) || 2721 (raw_cmd->kernel_data != current_req->buffer && 2722 CT(COMMAND) == FD_WRITE && 2723 (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max || 2724 aligned_sector_t < buffer_min)) || 2725 raw_cmd->length % (128 << SIZECODE) || 2726 raw_cmd->length <= 0 || current_count_sectors <= 0) { 2727 DPRINT("fractionary current count b=%lx s=%lx\n", 2728 raw_cmd->length, current_count_sectors); 2729 if (raw_cmd->kernel_data != current_req->buffer) 2730 pr_info("addr=%d, length=%ld\n", 2731 (int)((raw_cmd->kernel_data - 2732 floppy_track_buffer) >> 9), 2733 current_count_sectors); 2734 pr_info("st=%d ast=%d mse=%d msi=%d\n", 2735 fsector_t, aligned_sector_t, max_sector, max_size); 2736 pr_info("ssize=%x SIZECODE=%d\n", ssize, SIZECODE); 2737 pr_info("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n", 2738 COMMAND, SECTOR, HEAD, TRACK); 2739 pr_info("buffer drive=%d\n", buffer_drive); 2740 pr_info("buffer track=%d\n", buffer_track); 2741 pr_info("buffer_min=%d\n", buffer_min); 2742 pr_info("buffer_max=%d\n", buffer_max); 2743 return 0; 2744 } 2745 2746 if (raw_cmd->kernel_data != current_req->buffer) { 2747 if (raw_cmd->kernel_data < floppy_track_buffer || 2748 current_count_sectors < 0 || 2749 raw_cmd->length < 0 || 2750 raw_cmd->kernel_data + raw_cmd->length > 2751 floppy_track_buffer + (max_buffer_sectors << 10)) { 2752 DPRINT("buffer overrun in schedule dma\n"); 2753 pr_info("fsector_t=%d buffer_min=%d current_count=%ld\n", 2754 fsector_t, buffer_min, raw_cmd->length >> 9); 2755 pr_info("current_count_sectors=%ld\n", 2756 current_count_sectors); 2757 if (CT(COMMAND) == FD_READ) 2758 pr_info("read\n"); 2759 if (CT(COMMAND) == FD_WRITE) 2760 pr_info("write\n"); 2761 return 0; 2762 } 2763 } else if (raw_cmd->length > blk_rq_bytes(current_req) || 2764 current_count_sectors > blk_rq_sectors(current_req)) { 2765 DPRINT("buffer overrun in direct transfer\n"); 2766 return 0; 2767 } else if (raw_cmd->length < current_count_sectors << 9) { 2768 DPRINT("more sectors than bytes\n"); 2769 pr_info("bytes=%ld\n", raw_cmd->length >> 9); 2770 pr_info("sectors=%ld\n", current_count_sectors); 2771 } 2772 if (raw_cmd->length == 0) { 2773 DPRINT("zero dma transfer attempted from make_raw_request\n"); 2774 return 0; 2775 } 2776 2777 virtualdmabug_workaround(); 2778 return 2; 2779 } 2780 2781 /* 2782 * Round-robin between our available drives, doing one request from each 2783 */ 2784 static int set_next_request(void) 2785 { 2786 struct request_queue *q; 2787 int old_pos = fdc_queue; 2788 2789 do { 2790 q = disks[fdc_queue]->queue; 2791 if (++fdc_queue == N_DRIVE) 2792 fdc_queue = 0; 2793 if (q) { 2794 current_req = blk_fetch_request(q); 2795 if (current_req) 2796 break; 2797 } 2798 } while (fdc_queue != old_pos); 2799 2800 return current_req != NULL; 2801 } 2802 2803 static void redo_fd_request(void) 2804 { 2805 int drive; 2806 int tmp; 2807 2808 lastredo = jiffies; 2809 if (current_drive < N_DRIVE) 2810 floppy_off(current_drive); 2811 2812 do_request: 2813 if (!current_req) { 2814 int pending; 2815 2816 spin_lock_irq(&floppy_lock); 2817 pending = set_next_request(); 2818 spin_unlock_irq(&floppy_lock); 2819 if (!pending) { 2820 do_floppy = NULL; 2821 unlock_fdc(); 2822 return; 2823 } 2824 } 2825 drive = (long)current_req->rq_disk->private_data; 2826 set_fdc(drive); 2827 reschedule_timeout(current_reqD, "redo fd request"); 2828 2829 set_floppy(drive); 2830 raw_cmd = &default_raw_cmd; 2831 raw_cmd->flags = 0; 2832 if (start_motor(redo_fd_request)) 2833 return; 2834 2835 disk_change(current_drive); 2836 if (test_bit(current_drive, &fake_change) || 2837 test_bit(FD_DISK_CHANGED_BIT, &DRS->flags)) { 2838 DPRINT("disk absent or changed during operation\n"); 2839 request_done(0); 2840 goto do_request; 2841 } 2842 if (!_floppy) { /* Autodetection */ 2843 if (!probing) { 2844 DRS->probed_format = 0; 2845 if (next_valid_format()) { 2846 DPRINT("no autodetectable formats\n"); 2847 _floppy = NULL; 2848 request_done(0); 2849 goto do_request; 2850 } 2851 } 2852 probing = 1; 2853 _floppy = floppy_type + DP->autodetect[DRS->probed_format]; 2854 } else 2855 probing = 0; 2856 errors = &(current_req->errors); 2857 tmp = make_raw_rw_request(); 2858 if (tmp < 2) { 2859 request_done(tmp); 2860 goto do_request; 2861 } 2862 2863 if (test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags)) 2864 twaddle(); 2865 schedule_bh(floppy_start); 2866 debugt(__func__, "queue fd request"); 2867 return; 2868 } 2869 2870 static const struct cont_t rw_cont = { 2871 .interrupt = rw_interrupt, 2872 .redo = redo_fd_request, 2873 .error = bad_flp_intr, 2874 .done = request_done 2875 }; 2876 2877 static void process_fd_request(void) 2878 { 2879 cont = &rw_cont; 2880 schedule_bh(redo_fd_request); 2881 } 2882 2883 static void do_fd_request(struct request_queue *q) 2884 { 2885 if (WARN(max_buffer_sectors == 0, 2886 "VFS: %s called on non-open device\n", __func__)) 2887 return; 2888 2889 if (WARN(atomic_read(&usage_count) == 0, 2890 "warning: usage count=0, current_req=%p sect=%ld type=%x flags=%x\n", 2891 current_req, (long)blk_rq_pos(current_req), current_req->cmd_type, 2892 current_req->cmd_flags)) 2893 return; 2894 2895 if (test_and_set_bit(0, &fdc_busy)) { 2896 /* fdc busy, this new request will be treated when the 2897 current one is done */ 2898 is_alive(__func__, "old request running"); 2899 return; 2900 } 2901 command_status = FD_COMMAND_NONE; 2902 __reschedule_timeout(MAXTIMEOUT, "fd_request"); 2903 set_fdc(0); 2904 process_fd_request(); 2905 is_alive(__func__, ""); 2906 } 2907 2908 static const struct cont_t poll_cont = { 2909 .interrupt = success_and_wakeup, 2910 .redo = floppy_ready, 2911 .error = generic_failure, 2912 .done = generic_done 2913 }; 2914 2915 static int poll_drive(bool interruptible, int flag) 2916 { 2917 /* no auto-sense, just clear dcl */ 2918 raw_cmd = &default_raw_cmd; 2919 raw_cmd->flags = flag; 2920 raw_cmd->track = 0; 2921 raw_cmd->cmd_count = 0; 2922 cont = &poll_cont; 2923 debug_dcl(DP->flags, "setting NEWCHANGE in poll_drive\n"); 2924 set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags); 2925 2926 return wait_til_done(floppy_ready, interruptible); 2927 } 2928 2929 /* 2930 * User triggered reset 2931 * ==================== 2932 */ 2933 2934 static void reset_intr(void) 2935 { 2936 pr_info("weird, reset interrupt called\n"); 2937 } 2938 2939 static const struct cont_t reset_cont = { 2940 .interrupt = reset_intr, 2941 .redo = success_and_wakeup, 2942 .error = generic_failure, 2943 .done = generic_done 2944 }; 2945 2946 static int user_reset_fdc(int drive, int arg, bool interruptible) 2947 { 2948 int ret; 2949 2950 if (lock_fdc(drive, interruptible)) 2951 return -EINTR; 2952 2953 if (arg == FD_RESET_ALWAYS) 2954 FDCS->reset = 1; 2955 if (FDCS->reset) { 2956 cont = &reset_cont; 2957 ret = wait_til_done(reset_fdc, interruptible); 2958 if (ret == -EINTR) 2959 return -EINTR; 2960 } 2961 process_fd_request(); 2962 return 0; 2963 } 2964 2965 /* 2966 * Misc Ioctl's and support 2967 * ======================== 2968 */ 2969 static inline int fd_copyout(void __user *param, const void *address, 2970 unsigned long size) 2971 { 2972 return copy_to_user(param, address, size) ? -EFAULT : 0; 2973 } 2974 2975 static inline int fd_copyin(void __user *param, void *address, 2976 unsigned long size) 2977 { 2978 return copy_from_user(address, param, size) ? -EFAULT : 0; 2979 } 2980 2981 static const char *drive_name(int type, int drive) 2982 { 2983 struct floppy_struct *floppy; 2984 2985 if (type) 2986 floppy = floppy_type + type; 2987 else { 2988 if (UDP->native_format) 2989 floppy = floppy_type + UDP->native_format; 2990 else 2991 return "(null)"; 2992 } 2993 if (floppy->name) 2994 return floppy->name; 2995 else 2996 return "(null)"; 2997 } 2998 2999 /* raw commands */ 3000 static void raw_cmd_done(int flag) 3001 { 3002 int i; 3003 3004 if (!flag) { 3005 raw_cmd->flags |= FD_RAW_FAILURE; 3006 raw_cmd->flags |= FD_RAW_HARDFAILURE; 3007 } else { 3008 raw_cmd->reply_count = inr; 3009 if (raw_cmd->reply_count > MAX_REPLIES) 3010 raw_cmd->reply_count = 0; 3011 for (i = 0; i < raw_cmd->reply_count; i++) 3012 raw_cmd->reply[i] = reply_buffer[i]; 3013 3014 if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE)) { 3015 unsigned long flags; 3016 flags = claim_dma_lock(); 3017 raw_cmd->length = fd_get_dma_residue(); 3018 release_dma_lock(flags); 3019 } 3020 3021 if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) && 3022 (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0))) 3023 raw_cmd->flags |= FD_RAW_FAILURE; 3024 3025 if (disk_change(current_drive)) 3026 raw_cmd->flags |= FD_RAW_DISK_CHANGE; 3027 else 3028 raw_cmd->flags &= ~FD_RAW_DISK_CHANGE; 3029 if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER) 3030 motor_off_callback(current_drive); 3031 3032 if (raw_cmd->next && 3033 (!(raw_cmd->flags & FD_RAW_FAILURE) || 3034 !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) && 3035 ((raw_cmd->flags & FD_RAW_FAILURE) || 3036 !(raw_cmd->flags & FD_RAW_STOP_IF_SUCCESS))) { 3037 raw_cmd = raw_cmd->next; 3038 return; 3039 } 3040 } 3041 generic_done(flag); 3042 } 3043 3044 static const struct cont_t raw_cmd_cont = { 3045 .interrupt = success_and_wakeup, 3046 .redo = floppy_start, 3047 .error = generic_failure, 3048 .done = raw_cmd_done 3049 }; 3050 3051 static int raw_cmd_copyout(int cmd, void __user *param, 3052 struct floppy_raw_cmd *ptr) 3053 { 3054 int ret; 3055 3056 while (ptr) { 3057 ret = copy_to_user(param, ptr, sizeof(*ptr)); 3058 if (ret) 3059 return -EFAULT; 3060 param += sizeof(struct floppy_raw_cmd); 3061 if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) { 3062 if (ptr->length >= 0 && 3063 ptr->length <= ptr->buffer_length) { 3064 long length = ptr->buffer_length - ptr->length; 3065 ret = fd_copyout(ptr->data, ptr->kernel_data, 3066 length); 3067 if (ret) 3068 return ret; 3069 } 3070 } 3071 ptr = ptr->next; 3072 } 3073 3074 return 0; 3075 } 3076 3077 static void raw_cmd_free(struct floppy_raw_cmd **ptr) 3078 { 3079 struct floppy_raw_cmd *next; 3080 struct floppy_raw_cmd *this; 3081 3082 this = *ptr; 3083 *ptr = NULL; 3084 while (this) { 3085 if (this->buffer_length) { 3086 fd_dma_mem_free((unsigned long)this->kernel_data, 3087 this->buffer_length); 3088 this->buffer_length = 0; 3089 } 3090 next = this->next; 3091 kfree(this); 3092 this = next; 3093 } 3094 } 3095 3096 static int raw_cmd_copyin(int cmd, void __user *param, 3097 struct floppy_raw_cmd **rcmd) 3098 { 3099 struct floppy_raw_cmd *ptr; 3100 int ret; 3101 int i; 3102 3103 *rcmd = NULL; 3104 3105 loop: 3106 ptr = kmalloc(sizeof(struct floppy_raw_cmd), GFP_USER); 3107 if (!ptr) 3108 return -ENOMEM; 3109 *rcmd = ptr; 3110 ret = copy_from_user(ptr, param, sizeof(*ptr)); 3111 if (ret) 3112 return -EFAULT; 3113 ptr->next = NULL; 3114 ptr->buffer_length = 0; 3115 param += sizeof(struct floppy_raw_cmd); 3116 if (ptr->cmd_count > 33) 3117 /* the command may now also take up the space 3118 * initially intended for the reply & the 3119 * reply count. Needed for long 82078 commands 3120 * such as RESTORE, which takes ... 17 command 3121 * bytes. Murphy's law #137: When you reserve 3122 * 16 bytes for a structure, you'll one day 3123 * discover that you really need 17... 3124 */ 3125 return -EINVAL; 3126 3127 for (i = 0; i < 16; i++) 3128 ptr->reply[i] = 0; 3129 ptr->resultcode = 0; 3130 ptr->kernel_data = NULL; 3131 3132 if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) { 3133 if (ptr->length <= 0) 3134 return -EINVAL; 3135 ptr->kernel_data = (char *)fd_dma_mem_alloc(ptr->length); 3136 fallback_on_nodma_alloc(&ptr->kernel_data, ptr->length); 3137 if (!ptr->kernel_data) 3138 return -ENOMEM; 3139 ptr->buffer_length = ptr->length; 3140 } 3141 if (ptr->flags & FD_RAW_WRITE) { 3142 ret = fd_copyin(ptr->data, ptr->kernel_data, ptr->length); 3143 if (ret) 3144 return ret; 3145 } 3146 3147 if (ptr->flags & FD_RAW_MORE) { 3148 rcmd = &(ptr->next); 3149 ptr->rate &= 0x43; 3150 goto loop; 3151 } 3152 3153 return 0; 3154 } 3155 3156 static int raw_cmd_ioctl(int cmd, void __user *param) 3157 { 3158 struct floppy_raw_cmd *my_raw_cmd; 3159 int drive; 3160 int ret2; 3161 int ret; 3162 3163 if (FDCS->rawcmd <= 1) 3164 FDCS->rawcmd = 1; 3165 for (drive = 0; drive < N_DRIVE; drive++) { 3166 if (FDC(drive) != fdc) 3167 continue; 3168 if (drive == current_drive) { 3169 if (UDRS->fd_ref > 1) { 3170 FDCS->rawcmd = 2; 3171 break; 3172 } 3173 } else if (UDRS->fd_ref) { 3174 FDCS->rawcmd = 2; 3175 break; 3176 } 3177 } 3178 3179 if (FDCS->reset) 3180 return -EIO; 3181 3182 ret = raw_cmd_copyin(cmd, param, &my_raw_cmd); 3183 if (ret) { 3184 raw_cmd_free(&my_raw_cmd); 3185 return ret; 3186 } 3187 3188 raw_cmd = my_raw_cmd; 3189 cont = &raw_cmd_cont; 3190 ret = wait_til_done(floppy_start, true); 3191 debug_dcl(DP->flags, "calling disk change from raw_cmd ioctl\n"); 3192 3193 if (ret != -EINTR && FDCS->reset) 3194 ret = -EIO; 3195 3196 DRS->track = NO_TRACK; 3197 3198 ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd); 3199 if (!ret) 3200 ret = ret2; 3201 raw_cmd_free(&my_raw_cmd); 3202 return ret; 3203 } 3204 3205 static int invalidate_drive(struct block_device *bdev) 3206 { 3207 /* invalidate the buffer track to force a reread */ 3208 set_bit((long)bdev->bd_disk->private_data, &fake_change); 3209 process_fd_request(); 3210 check_disk_change(bdev); 3211 return 0; 3212 } 3213 3214 static int set_geometry(unsigned int cmd, struct floppy_struct *g, 3215 int drive, int type, struct block_device *bdev) 3216 { 3217 int cnt; 3218 3219 /* sanity checking for parameters. */ 3220 if (g->sect <= 0 || 3221 g->head <= 0 || 3222 g->track <= 0 || g->track > UDP->tracks >> STRETCH(g) || 3223 /* check if reserved bits are set */ 3224 (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_SECTBASEMASK)) != 0) 3225 return -EINVAL; 3226 if (type) { 3227 if (!capable(CAP_SYS_ADMIN)) 3228 return -EPERM; 3229 mutex_lock(&open_lock); 3230 if (lock_fdc(drive, true)) { 3231 mutex_unlock(&open_lock); 3232 return -EINTR; 3233 } 3234 floppy_type[type] = *g; 3235 floppy_type[type].name = "user format"; 3236 for (cnt = type << 2; cnt < (type << 2) + 4; cnt++) 3237 floppy_sizes[cnt] = floppy_sizes[cnt + 0x80] = 3238 floppy_type[type].size + 1; 3239 process_fd_request(); 3240 for (cnt = 0; cnt < N_DRIVE; cnt++) { 3241 struct block_device *bdev = opened_bdev[cnt]; 3242 if (!bdev || ITYPE(drive_state[cnt].fd_device) != type) 3243 continue; 3244 __invalidate_device(bdev, true); 3245 } 3246 mutex_unlock(&open_lock); 3247 } else { 3248 int oldStretch; 3249 3250 if (lock_fdc(drive, true)) 3251 return -EINTR; 3252 if (cmd != FDDEFPRM) { 3253 /* notice a disk change immediately, else 3254 * we lose our settings immediately*/ 3255 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR) 3256 return -EINTR; 3257 } 3258 oldStretch = g->stretch; 3259 user_params[drive] = *g; 3260 if (buffer_drive == drive) 3261 SUPBOUND(buffer_max, user_params[drive].sect); 3262 current_type[drive] = &user_params[drive]; 3263 floppy_sizes[drive] = user_params[drive].size; 3264 if (cmd == FDDEFPRM) 3265 DRS->keep_data = -1; 3266 else 3267 DRS->keep_data = 1; 3268 /* invalidation. Invalidate only when needed, i.e. 3269 * when there are already sectors in the buffer cache 3270 * whose number will change. This is useful, because 3271 * mtools often changes the geometry of the disk after 3272 * looking at the boot block */ 3273 if (DRS->maxblock > user_params[drive].sect || 3274 DRS->maxtrack || 3275 ((user_params[drive].sect ^ oldStretch) & 3276 (FD_SWAPSIDES | FD_SECTBASEMASK))) 3277 invalidate_drive(bdev); 3278 else 3279 process_fd_request(); 3280 } 3281 return 0; 3282 } 3283 3284 /* handle obsolete ioctl's */ 3285 static unsigned int ioctl_table[] = { 3286 FDCLRPRM, 3287 FDSETPRM, 3288 FDDEFPRM, 3289 FDGETPRM, 3290 FDMSGON, 3291 FDMSGOFF, 3292 FDFMTBEG, 3293 FDFMTTRK, 3294 FDFMTEND, 3295 FDSETEMSGTRESH, 3296 FDFLUSH, 3297 FDSETMAXERRS, 3298 FDGETMAXERRS, 3299 FDGETDRVTYP, 3300 FDSETDRVPRM, 3301 FDGETDRVPRM, 3302 FDGETDRVSTAT, 3303 FDPOLLDRVSTAT, 3304 FDRESET, 3305 FDGETFDCSTAT, 3306 FDWERRORCLR, 3307 FDWERRORGET, 3308 FDRAWCMD, 3309 FDEJECT, 3310 FDTWADDLE 3311 }; 3312 3313 static int normalize_ioctl(unsigned int *cmd, int *size) 3314 { 3315 int i; 3316 3317 for (i = 0; i < ARRAY_SIZE(ioctl_table); i++) { 3318 if ((*cmd & 0xffff) == (ioctl_table[i] & 0xffff)) { 3319 *size = _IOC_SIZE(*cmd); 3320 *cmd = ioctl_table[i]; 3321 if (*size > _IOC_SIZE(*cmd)) { 3322 pr_info("ioctl not yet supported\n"); 3323 return -EFAULT; 3324 } 3325 return 0; 3326 } 3327 } 3328 return -EINVAL; 3329 } 3330 3331 static int get_floppy_geometry(int drive, int type, struct floppy_struct **g) 3332 { 3333 if (type) 3334 *g = &floppy_type[type]; 3335 else { 3336 if (lock_fdc(drive, false)) 3337 return -EINTR; 3338 if (poll_drive(false, 0) == -EINTR) 3339 return -EINTR; 3340 process_fd_request(); 3341 *g = current_type[drive]; 3342 } 3343 if (!*g) 3344 return -ENODEV; 3345 return 0; 3346 } 3347 3348 static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 3349 { 3350 int drive = (long)bdev->bd_disk->private_data; 3351 int type = ITYPE(drive_state[drive].fd_device); 3352 struct floppy_struct *g; 3353 int ret; 3354 3355 ret = get_floppy_geometry(drive, type, &g); 3356 if (ret) 3357 return ret; 3358 3359 geo->heads = g->head; 3360 geo->sectors = g->sect; 3361 geo->cylinders = g->track; 3362 return 0; 3363 } 3364 3365 static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, 3366 unsigned long param) 3367 { 3368 int drive = (long)bdev->bd_disk->private_data; 3369 int type = ITYPE(UDRS->fd_device); 3370 int i; 3371 int ret; 3372 int size; 3373 union inparam { 3374 struct floppy_struct g; /* geometry */ 3375 struct format_descr f; 3376 struct floppy_max_errors max_errors; 3377 struct floppy_drive_params dp; 3378 } inparam; /* parameters coming from user space */ 3379 const void *outparam; /* parameters passed back to user space */ 3380 3381 /* convert compatibility eject ioctls into floppy eject ioctl. 3382 * We do this in order to provide a means to eject floppy disks before 3383 * installing the new fdutils package */ 3384 if (cmd == CDROMEJECT || /* CD-ROM eject */ 3385 cmd == 0x6470) { /* SunOS floppy eject */ 3386 DPRINT("obsolete eject ioctl\n"); 3387 DPRINT("please use floppycontrol --eject\n"); 3388 cmd = FDEJECT; 3389 } 3390 3391 if (!((cmd & 0xff00) == 0x0200)) 3392 return -EINVAL; 3393 3394 /* convert the old style command into a new style command */ 3395 ret = normalize_ioctl(&cmd, &size); 3396 if (ret) 3397 return ret; 3398 3399 /* permission checks */ 3400 if (((cmd & 0x40) && !(mode & (FMODE_WRITE | FMODE_WRITE_IOCTL))) || 3401 ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))) 3402 return -EPERM; 3403 3404 if (WARN_ON(size < 0 || size > sizeof(inparam))) 3405 return -EINVAL; 3406 3407 /* copyin */ 3408 memset(&inparam, 0, sizeof(inparam)); 3409 if (_IOC_DIR(cmd) & _IOC_WRITE) { 3410 ret = fd_copyin((void __user *)param, &inparam, size); 3411 if (ret) 3412 return ret; 3413 } 3414 3415 switch (cmd) { 3416 case FDEJECT: 3417 if (UDRS->fd_ref != 1) 3418 /* somebody else has this drive open */ 3419 return -EBUSY; 3420 if (lock_fdc(drive, true)) 3421 return -EINTR; 3422 3423 /* do the actual eject. Fails on 3424 * non-Sparc architectures */ 3425 ret = fd_eject(UNIT(drive)); 3426 3427 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags); 3428 set_bit(FD_VERIFY_BIT, &UDRS->flags); 3429 process_fd_request(); 3430 return ret; 3431 case FDCLRPRM: 3432 if (lock_fdc(drive, true)) 3433 return -EINTR; 3434 current_type[drive] = NULL; 3435 floppy_sizes[drive] = MAX_DISK_SIZE << 1; 3436 UDRS->keep_data = 0; 3437 return invalidate_drive(bdev); 3438 case FDSETPRM: 3439 case FDDEFPRM: 3440 return set_geometry(cmd, &inparam.g, drive, type, bdev); 3441 case FDGETPRM: 3442 ret = get_floppy_geometry(drive, type, 3443 (struct floppy_struct **)&outparam); 3444 if (ret) 3445 return ret; 3446 break; 3447 case FDMSGON: 3448 UDP->flags |= FTD_MSG; 3449 return 0; 3450 case FDMSGOFF: 3451 UDP->flags &= ~FTD_MSG; 3452 return 0; 3453 case FDFMTBEG: 3454 if (lock_fdc(drive, true)) 3455 return -EINTR; 3456 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR) 3457 return -EINTR; 3458 ret = UDRS->flags; 3459 process_fd_request(); 3460 if (ret & FD_VERIFY) 3461 return -ENODEV; 3462 if (!(ret & FD_DISK_WRITABLE)) 3463 return -EROFS; 3464 return 0; 3465 case FDFMTTRK: 3466 if (UDRS->fd_ref != 1) 3467 return -EBUSY; 3468 return do_format(drive, &inparam.f); 3469 case FDFMTEND: 3470 case FDFLUSH: 3471 if (lock_fdc(drive, true)) 3472 return -EINTR; 3473 return invalidate_drive(bdev); 3474 case FDSETEMSGTRESH: 3475 UDP->max_errors.reporting = (unsigned short)(param & 0x0f); 3476 return 0; 3477 case FDGETMAXERRS: 3478 outparam = &UDP->max_errors; 3479 break; 3480 case FDSETMAXERRS: 3481 UDP->max_errors = inparam.max_errors; 3482 break; 3483 case FDGETDRVTYP: 3484 outparam = drive_name(type, drive); 3485 SUPBOUND(size, strlen((const char *)outparam) + 1); 3486 break; 3487 case FDSETDRVPRM: 3488 *UDP = inparam.dp; 3489 break; 3490 case FDGETDRVPRM: 3491 outparam = UDP; 3492 break; 3493 case FDPOLLDRVSTAT: 3494 if (lock_fdc(drive, true)) 3495 return -EINTR; 3496 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR) 3497 return -EINTR; 3498 process_fd_request(); 3499 /* fall through */ 3500 case FDGETDRVSTAT: 3501 outparam = UDRS; 3502 break; 3503 case FDRESET: 3504 return user_reset_fdc(drive, (int)param, true); 3505 case FDGETFDCSTAT: 3506 outparam = UFDCS; 3507 break; 3508 case FDWERRORCLR: 3509 memset(UDRWE, 0, sizeof(*UDRWE)); 3510 return 0; 3511 case FDWERRORGET: 3512 outparam = UDRWE; 3513 break; 3514 case FDRAWCMD: 3515 if (type) 3516 return -EINVAL; 3517 if (lock_fdc(drive, true)) 3518 return -EINTR; 3519 set_floppy(drive); 3520 i = raw_cmd_ioctl(cmd, (void __user *)param); 3521 if (i == -EINTR) 3522 return -EINTR; 3523 process_fd_request(); 3524 return i; 3525 case FDTWADDLE: 3526 if (lock_fdc(drive, true)) 3527 return -EINTR; 3528 twaddle(); 3529 process_fd_request(); 3530 return 0; 3531 default: 3532 return -EINVAL; 3533 } 3534 3535 if (_IOC_DIR(cmd) & _IOC_READ) 3536 return fd_copyout((void __user *)param, outparam, size); 3537 3538 return 0; 3539 } 3540 3541 static int fd_ioctl(struct block_device *bdev, fmode_t mode, 3542 unsigned int cmd, unsigned long param) 3543 { 3544 int ret; 3545 3546 mutex_lock(&floppy_mutex); 3547 ret = fd_locked_ioctl(bdev, mode, cmd, param); 3548 mutex_unlock(&floppy_mutex); 3549 3550 return ret; 3551 } 3552 3553 static void __init config_types(void) 3554 { 3555 bool has_drive = false; 3556 int drive; 3557 3558 /* read drive info out of physical CMOS */ 3559 drive = 0; 3560 if (!UDP->cmos) 3561 UDP->cmos = FLOPPY0_TYPE; 3562 drive = 1; 3563 if (!UDP->cmos && FLOPPY1_TYPE) 3564 UDP->cmos = FLOPPY1_TYPE; 3565 3566 /* FIXME: additional physical CMOS drive detection should go here */ 3567 3568 for (drive = 0; drive < N_DRIVE; drive++) { 3569 unsigned int type = UDP->cmos; 3570 struct floppy_drive_params *params; 3571 const char *name = NULL; 3572 static char temparea[32]; 3573 3574 if (type < ARRAY_SIZE(default_drive_params)) { 3575 params = &default_drive_params[type].params; 3576 if (type) { 3577 name = default_drive_params[type].name; 3578 allowed_drive_mask |= 1 << drive; 3579 } else 3580 allowed_drive_mask &= ~(1 << drive); 3581 } else { 3582 params = &default_drive_params[0].params; 3583 sprintf(temparea, "unknown type %d (usb?)", type); 3584 name = temparea; 3585 } 3586 if (name) { 3587 const char *prepend; 3588 if (!has_drive) { 3589 prepend = ""; 3590 has_drive = true; 3591 pr_info("Floppy drive(s):"); 3592 } else { 3593 prepend = ","; 3594 } 3595 3596 pr_cont("%s fd%d is %s", prepend, drive, name); 3597 } 3598 *UDP = *params; 3599 } 3600 3601 if (has_drive) 3602 pr_cont("\n"); 3603 } 3604 3605 static int floppy_release(struct gendisk *disk, fmode_t mode) 3606 { 3607 int drive = (long)disk->private_data; 3608 3609 mutex_lock(&floppy_mutex); 3610 mutex_lock(&open_lock); 3611 if (!UDRS->fd_ref--) { 3612 DPRINT("floppy_release with fd_ref == 0"); 3613 UDRS->fd_ref = 0; 3614 } 3615 if (!UDRS->fd_ref) 3616 opened_bdev[drive] = NULL; 3617 mutex_unlock(&open_lock); 3618 mutex_unlock(&floppy_mutex); 3619 3620 return 0; 3621 } 3622 3623 /* 3624 * floppy_open check for aliasing (/dev/fd0 can be the same as 3625 * /dev/PS0 etc), and disallows simultaneous access to the same 3626 * drive with different device numbers. 3627 */ 3628 static int floppy_open(struct block_device *bdev, fmode_t mode) 3629 { 3630 int drive = (long)bdev->bd_disk->private_data; 3631 int old_dev, new_dev; 3632 int try; 3633 int res = -EBUSY; 3634 char *tmp; 3635 3636 mutex_lock(&floppy_mutex); 3637 mutex_lock(&open_lock); 3638 old_dev = UDRS->fd_device; 3639 if (opened_bdev[drive] && opened_bdev[drive] != bdev) 3640 goto out2; 3641 3642 if (!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)) { 3643 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags); 3644 set_bit(FD_VERIFY_BIT, &UDRS->flags); 3645 } 3646 3647 UDRS->fd_ref++; 3648 3649 opened_bdev[drive] = bdev; 3650 3651 res = -ENXIO; 3652 3653 if (!floppy_track_buffer) { 3654 /* if opening an ED drive, reserve a big buffer, 3655 * else reserve a small one */ 3656 if ((UDP->cmos == 6) || (UDP->cmos == 5)) 3657 try = 64; /* Only 48 actually useful */ 3658 else 3659 try = 32; /* Only 24 actually useful */ 3660 3661 tmp = (char *)fd_dma_mem_alloc(1024 * try); 3662 if (!tmp && !floppy_track_buffer) { 3663 try >>= 1; /* buffer only one side */ 3664 INFBOUND(try, 16); 3665 tmp = (char *)fd_dma_mem_alloc(1024 * try); 3666 } 3667 if (!tmp && !floppy_track_buffer) 3668 fallback_on_nodma_alloc(&tmp, 2048 * try); 3669 if (!tmp && !floppy_track_buffer) { 3670 DPRINT("Unable to allocate DMA memory\n"); 3671 goto out; 3672 } 3673 if (floppy_track_buffer) { 3674 if (tmp) 3675 fd_dma_mem_free((unsigned long)tmp, try * 1024); 3676 } else { 3677 buffer_min = buffer_max = -1; 3678 floppy_track_buffer = tmp; 3679 max_buffer_sectors = try; 3680 } 3681 } 3682 3683 new_dev = MINOR(bdev->bd_dev); 3684 UDRS->fd_device = new_dev; 3685 set_capacity(disks[drive], floppy_sizes[new_dev]); 3686 if (old_dev != -1 && old_dev != new_dev) { 3687 if (buffer_drive == drive) 3688 buffer_track = -1; 3689 } 3690 3691 if (UFDCS->rawcmd == 1) 3692 UFDCS->rawcmd = 2; 3693 3694 if (!(mode & FMODE_NDELAY)) { 3695 if (mode & (FMODE_READ|FMODE_WRITE)) { 3696 UDRS->last_checked = 0; 3697 check_disk_change(bdev); 3698 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags)) 3699 goto out; 3700 } 3701 res = -EROFS; 3702 if ((mode & FMODE_WRITE) && 3703 !test_bit(FD_DISK_WRITABLE_BIT, &UDRS->flags)) 3704 goto out; 3705 } 3706 mutex_unlock(&open_lock); 3707 mutex_unlock(&floppy_mutex); 3708 return 0; 3709 out: 3710 UDRS->fd_ref--; 3711 3712 if (!UDRS->fd_ref) 3713 opened_bdev[drive] = NULL; 3714 out2: 3715 mutex_unlock(&open_lock); 3716 mutex_unlock(&floppy_mutex); 3717 return res; 3718 } 3719 3720 /* 3721 * Check if the disk has been changed or if a change has been faked. 3722 */ 3723 static unsigned int floppy_check_events(struct gendisk *disk, 3724 unsigned int clearing) 3725 { 3726 int drive = (long)disk->private_data; 3727 3728 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) || 3729 test_bit(FD_VERIFY_BIT, &UDRS->flags)) 3730 return DISK_EVENT_MEDIA_CHANGE; 3731 3732 if (time_after(jiffies, UDRS->last_checked + UDP->checkfreq)) { 3733 lock_fdc(drive, false); 3734 poll_drive(false, 0); 3735 process_fd_request(); 3736 } 3737 3738 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) || 3739 test_bit(FD_VERIFY_BIT, &UDRS->flags) || 3740 test_bit(drive, &fake_change) || 3741 drive_no_geom(drive)) 3742 return DISK_EVENT_MEDIA_CHANGE; 3743 return 0; 3744 } 3745 3746 /* 3747 * This implements "read block 0" for floppy_revalidate(). 3748 * Needed for format autodetection, checking whether there is 3749 * a disk in the drive, and whether that disk is writable. 3750 */ 3751 3752 static void floppy_rb0_complete(struct bio *bio, int err) 3753 { 3754 complete((struct completion *)bio->bi_private); 3755 } 3756 3757 static int __floppy_read_block_0(struct block_device *bdev) 3758 { 3759 struct bio bio; 3760 struct bio_vec bio_vec; 3761 struct completion complete; 3762 struct page *page; 3763 size_t size; 3764 3765 page = alloc_page(GFP_NOIO); 3766 if (!page) { 3767 process_fd_request(); 3768 return -ENOMEM; 3769 } 3770 3771 size = bdev->bd_block_size; 3772 if (!size) 3773 size = 1024; 3774 3775 bio_init(&bio); 3776 bio.bi_io_vec = &bio_vec; 3777 bio_vec.bv_page = page; 3778 bio_vec.bv_len = size; 3779 bio_vec.bv_offset = 0; 3780 bio.bi_vcnt = 1; 3781 bio.bi_idx = 0; 3782 bio.bi_size = size; 3783 bio.bi_bdev = bdev; 3784 bio.bi_sector = 0; 3785 bio.bi_flags = (1 << BIO_QUIET); 3786 init_completion(&complete); 3787 bio.bi_private = &complete; 3788 bio.bi_end_io = floppy_rb0_complete; 3789 3790 submit_bio(READ, &bio); 3791 process_fd_request(); 3792 wait_for_completion(&complete); 3793 3794 __free_page(page); 3795 3796 return 0; 3797 } 3798 3799 /* revalidate the floppy disk, i.e. trigger format autodetection by reading 3800 * the bootblock (block 0). "Autodetection" is also needed to check whether 3801 * there is a disk in the drive at all... Thus we also do it for fixed 3802 * geometry formats */ 3803 static int floppy_revalidate(struct gendisk *disk) 3804 { 3805 int drive = (long)disk->private_data; 3806 int cf; 3807 int res = 0; 3808 3809 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) || 3810 test_bit(FD_VERIFY_BIT, &UDRS->flags) || 3811 test_bit(drive, &fake_change) || 3812 drive_no_geom(drive)) { 3813 if (WARN(atomic_read(&usage_count) == 0, 3814 "VFS: revalidate called on non-open device.\n")) 3815 return -EFAULT; 3816 3817 lock_fdc(drive, false); 3818 cf = (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) || 3819 test_bit(FD_VERIFY_BIT, &UDRS->flags)); 3820 if (!(cf || test_bit(drive, &fake_change) || drive_no_geom(drive))) { 3821 process_fd_request(); /*already done by another thread */ 3822 return 0; 3823 } 3824 UDRS->maxblock = 0; 3825 UDRS->maxtrack = 0; 3826 if (buffer_drive == drive) 3827 buffer_track = -1; 3828 clear_bit(drive, &fake_change); 3829 clear_bit(FD_DISK_CHANGED_BIT, &UDRS->flags); 3830 if (cf) 3831 UDRS->generation++; 3832 if (drive_no_geom(drive)) { 3833 /* auto-sensing */ 3834 res = __floppy_read_block_0(opened_bdev[drive]); 3835 } else { 3836 if (cf) 3837 poll_drive(false, FD_RAW_NEED_DISK); 3838 process_fd_request(); 3839 } 3840 } 3841 set_capacity(disk, floppy_sizes[UDRS->fd_device]); 3842 return res; 3843 } 3844 3845 static const struct block_device_operations floppy_fops = { 3846 .owner = THIS_MODULE, 3847 .open = floppy_open, 3848 .release = floppy_release, 3849 .ioctl = fd_ioctl, 3850 .getgeo = fd_getgeo, 3851 .check_events = floppy_check_events, 3852 .revalidate_disk = floppy_revalidate, 3853 }; 3854 3855 /* 3856 * Floppy Driver initialization 3857 * ============================= 3858 */ 3859 3860 /* Determine the floppy disk controller type */ 3861 /* This routine was written by David C. Niemi */ 3862 static char __init get_fdc_version(void) 3863 { 3864 int r; 3865 3866 output_byte(FD_DUMPREGS); /* 82072 and better know DUMPREGS */ 3867 if (FDCS->reset) 3868 return FDC_NONE; 3869 r = result(); 3870 if (r <= 0x00) 3871 return FDC_NONE; /* No FDC present ??? */ 3872 if ((r == 1) && (reply_buffer[0] == 0x80)) { 3873 pr_info("FDC %d is an 8272A\n", fdc); 3874 return FDC_8272A; /* 8272a/765 don't know DUMPREGS */ 3875 } 3876 if (r != 10) { 3877 pr_info("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n", 3878 fdc, r); 3879 return FDC_UNKNOWN; 3880 } 3881 3882 if (!fdc_configure()) { 3883 pr_info("FDC %d is an 82072\n", fdc); 3884 return FDC_82072; /* 82072 doesn't know CONFIGURE */ 3885 } 3886 3887 output_byte(FD_PERPENDICULAR); 3888 if (need_more_output() == MORE_OUTPUT) { 3889 output_byte(0); 3890 } else { 3891 pr_info("FDC %d is an 82072A\n", fdc); 3892 return FDC_82072A; /* 82072A as found on Sparcs. */ 3893 } 3894 3895 output_byte(FD_UNLOCK); 3896 r = result(); 3897 if ((r == 1) && (reply_buffer[0] == 0x80)) { 3898 pr_info("FDC %d is a pre-1991 82077\n", fdc); 3899 return FDC_82077_ORIG; /* Pre-1991 82077, doesn't know 3900 * LOCK/UNLOCK */ 3901 } 3902 if ((r != 1) || (reply_buffer[0] != 0x00)) { 3903 pr_info("FDC %d init: UNLOCK: unexpected return of %d bytes.\n", 3904 fdc, r); 3905 return FDC_UNKNOWN; 3906 } 3907 output_byte(FD_PARTID); 3908 r = result(); 3909 if (r != 1) { 3910 pr_info("FDC %d init: PARTID: unexpected return of %d bytes.\n", 3911 fdc, r); 3912 return FDC_UNKNOWN; 3913 } 3914 if (reply_buffer[0] == 0x80) { 3915 pr_info("FDC %d is a post-1991 82077\n", fdc); 3916 return FDC_82077; /* Revised 82077AA passes all the tests */ 3917 } 3918 switch (reply_buffer[0] >> 5) { 3919 case 0x0: 3920 /* Either a 82078-1 or a 82078SL running at 5Volt */ 3921 pr_info("FDC %d is an 82078.\n", fdc); 3922 return FDC_82078; 3923 case 0x1: 3924 pr_info("FDC %d is a 44pin 82078\n", fdc); 3925 return FDC_82078; 3926 case 0x2: 3927 pr_info("FDC %d is a S82078B\n", fdc); 3928 return FDC_S82078B; 3929 case 0x3: 3930 pr_info("FDC %d is a National Semiconductor PC87306\n", fdc); 3931 return FDC_87306; 3932 default: 3933 pr_info("FDC %d init: 82078 variant with unknown PARTID=%d.\n", 3934 fdc, reply_buffer[0] >> 5); 3935 return FDC_82078_UNKN; 3936 } 3937 } /* get_fdc_version */ 3938 3939 /* lilo configuration */ 3940 3941 static void __init floppy_set_flags(int *ints, int param, int param2) 3942 { 3943 int i; 3944 3945 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) { 3946 if (param) 3947 default_drive_params[i].params.flags |= param2; 3948 else 3949 default_drive_params[i].params.flags &= ~param2; 3950 } 3951 DPRINT("%s flag 0x%x\n", param2 ? "Setting" : "Clearing", param); 3952 } 3953 3954 static void __init daring(int *ints, int param, int param2) 3955 { 3956 int i; 3957 3958 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) { 3959 if (param) { 3960 default_drive_params[i].params.select_delay = 0; 3961 default_drive_params[i].params.flags |= 3962 FD_SILENT_DCL_CLEAR; 3963 } else { 3964 default_drive_params[i].params.select_delay = 3965 2 * HZ / 100; 3966 default_drive_params[i].params.flags &= 3967 ~FD_SILENT_DCL_CLEAR; 3968 } 3969 } 3970 DPRINT("Assuming %s floppy hardware\n", param ? "standard" : "broken"); 3971 } 3972 3973 static void __init set_cmos(int *ints, int dummy, int dummy2) 3974 { 3975 int current_drive = 0; 3976 3977 if (ints[0] != 2) { 3978 DPRINT("wrong number of parameters for CMOS\n"); 3979 return; 3980 } 3981 current_drive = ints[1]; 3982 if (current_drive < 0 || current_drive >= 8) { 3983 DPRINT("bad drive for set_cmos\n"); 3984 return; 3985 } 3986 #if N_FDC > 1 3987 if (current_drive >= 4 && !FDC2) 3988 FDC2 = 0x370; 3989 #endif 3990 DP->cmos = ints[2]; 3991 DPRINT("setting CMOS code to %d\n", ints[2]); 3992 } 3993 3994 static struct param_table { 3995 const char *name; 3996 void (*fn) (int *ints, int param, int param2); 3997 int *var; 3998 int def_param; 3999 int param2; 4000 } config_params[] __initdata = { 4001 {"allowed_drive_mask", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */ 4002 {"all_drives", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */ 4003 {"asus_pci", NULL, &allowed_drive_mask, 0x33, 0}, 4004 {"irq", NULL, &FLOPPY_IRQ, 6, 0}, 4005 {"dma", NULL, &FLOPPY_DMA, 2, 0}, 4006 {"daring", daring, NULL, 1, 0}, 4007 #if N_FDC > 1 4008 {"two_fdc", NULL, &FDC2, 0x370, 0}, 4009 {"one_fdc", NULL, &FDC2, 0, 0}, 4010 #endif 4011 {"thinkpad", floppy_set_flags, NULL, 1, FD_INVERTED_DCL}, 4012 {"broken_dcl", floppy_set_flags, NULL, 1, FD_BROKEN_DCL}, 4013 {"messages", floppy_set_flags, NULL, 1, FTD_MSG}, 4014 {"silent_dcl_clear", floppy_set_flags, NULL, 1, FD_SILENT_DCL_CLEAR}, 4015 {"debug", floppy_set_flags, NULL, 1, FD_DEBUG}, 4016 {"nodma", NULL, &can_use_virtual_dma, 1, 0}, 4017 {"omnibook", NULL, &can_use_virtual_dma, 1, 0}, 4018 {"yesdma", NULL, &can_use_virtual_dma, 0, 0}, 4019 {"fifo_depth", NULL, &fifo_depth, 0xa, 0}, 4020 {"nofifo", NULL, &no_fifo, 0x20, 0}, 4021 {"usefifo", NULL, &no_fifo, 0, 0}, 4022 {"cmos", set_cmos, NULL, 0, 0}, 4023 {"slow", NULL, &slow_floppy, 1, 0}, 4024 {"unexpected_interrupts", NULL, &print_unex, 1, 0}, 4025 {"no_unexpected_interrupts", NULL, &print_unex, 0, 0}, 4026 {"L40SX", NULL, &print_unex, 0, 0} 4027 4028 EXTRA_FLOPPY_PARAMS 4029 }; 4030 4031 static int __init floppy_setup(char *str) 4032 { 4033 int i; 4034 int param; 4035 int ints[11]; 4036 4037 str = get_options(str, ARRAY_SIZE(ints), ints); 4038 if (str) { 4039 for (i = 0; i < ARRAY_SIZE(config_params); i++) { 4040 if (strcmp(str, config_params[i].name) == 0) { 4041 if (ints[0]) 4042 param = ints[1]; 4043 else 4044 param = config_params[i].def_param; 4045 if (config_params[i].fn) 4046 config_params[i].fn(ints, param, 4047 config_params[i]. 4048 param2); 4049 if (config_params[i].var) { 4050 DPRINT("%s=%d\n", str, param); 4051 *config_params[i].var = param; 4052 } 4053 return 1; 4054 } 4055 } 4056 } 4057 if (str) { 4058 DPRINT("unknown floppy option [%s]\n", str); 4059 4060 DPRINT("allowed options are:"); 4061 for (i = 0; i < ARRAY_SIZE(config_params); i++) 4062 pr_cont(" %s", config_params[i].name); 4063 pr_cont("\n"); 4064 } else 4065 DPRINT("botched floppy option\n"); 4066 DPRINT("Read Documentation/blockdev/floppy.txt\n"); 4067 return 0; 4068 } 4069 4070 static int have_no_fdc = -ENODEV; 4071 4072 static ssize_t floppy_cmos_show(struct device *dev, 4073 struct device_attribute *attr, char *buf) 4074 { 4075 struct platform_device *p = to_platform_device(dev); 4076 int drive; 4077 4078 drive = p->id; 4079 return sprintf(buf, "%X\n", UDP->cmos); 4080 } 4081 4082 static DEVICE_ATTR(cmos, S_IRUGO, floppy_cmos_show, NULL); 4083 4084 static void floppy_device_release(struct device *dev) 4085 { 4086 } 4087 4088 static int floppy_resume(struct device *dev) 4089 { 4090 int fdc; 4091 4092 for (fdc = 0; fdc < N_FDC; fdc++) 4093 if (FDCS->address != -1) 4094 user_reset_fdc(-1, FD_RESET_ALWAYS, false); 4095 4096 return 0; 4097 } 4098 4099 static const struct dev_pm_ops floppy_pm_ops = { 4100 .resume = floppy_resume, 4101 .restore = floppy_resume, 4102 }; 4103 4104 static struct platform_driver floppy_driver = { 4105 .driver = { 4106 .name = "floppy", 4107 .pm = &floppy_pm_ops, 4108 }, 4109 }; 4110 4111 static struct platform_device floppy_device[N_DRIVE]; 4112 4113 static struct kobject *floppy_find(dev_t dev, int *part, void *data) 4114 { 4115 int drive = (*part & 3) | ((*part & 0x80) >> 5); 4116 if (drive >= N_DRIVE || 4117 !(allowed_drive_mask & (1 << drive)) || 4118 fdc_state[FDC(drive)].version == FDC_NONE) 4119 return NULL; 4120 if (((*part >> 2) & 0x1f) >= ARRAY_SIZE(floppy_type)) 4121 return NULL; 4122 *part = 0; 4123 return get_disk(disks[drive]); 4124 } 4125 4126 static int __init floppy_init(void) 4127 { 4128 int i, unit, drive; 4129 int err, dr; 4130 4131 set_debugt(); 4132 interruptjiffies = resultjiffies = jiffies; 4133 4134 #if defined(CONFIG_PPC) 4135 if (check_legacy_ioport(FDC1)) 4136 return -ENODEV; 4137 #endif 4138 4139 raw_cmd = NULL; 4140 4141 for (dr = 0; dr < N_DRIVE; dr++) { 4142 disks[dr] = alloc_disk(1); 4143 if (!disks[dr]) { 4144 err = -ENOMEM; 4145 goto out_put_disk; 4146 } 4147 4148 floppy_wq = alloc_ordered_workqueue("floppy", 0); 4149 if (!floppy_wq) { 4150 err = -ENOMEM; 4151 goto out_put_disk; 4152 } 4153 4154 disks[dr]->queue = blk_init_queue(do_fd_request, &floppy_lock); 4155 if (!disks[dr]->queue) { 4156 err = -ENOMEM; 4157 goto out_destroy_workq; 4158 } 4159 4160 blk_queue_max_hw_sectors(disks[dr]->queue, 64); 4161 disks[dr]->major = FLOPPY_MAJOR; 4162 disks[dr]->first_minor = TOMINOR(dr); 4163 disks[dr]->fops = &floppy_fops; 4164 sprintf(disks[dr]->disk_name, "fd%d", dr); 4165 4166 init_timer(&motor_off_timer[dr]); 4167 motor_off_timer[dr].data = dr; 4168 motor_off_timer[dr].function = motor_off_callback; 4169 } 4170 4171 err = register_blkdev(FLOPPY_MAJOR, "fd"); 4172 if (err) 4173 goto out_put_disk; 4174 4175 err = platform_driver_register(&floppy_driver); 4176 if (err) 4177 goto out_unreg_blkdev; 4178 4179 blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE, 4180 floppy_find, NULL, NULL); 4181 4182 for (i = 0; i < 256; i++) 4183 if (ITYPE(i)) 4184 floppy_sizes[i] = floppy_type[ITYPE(i)].size; 4185 else 4186 floppy_sizes[i] = MAX_DISK_SIZE << 1; 4187 4188 reschedule_timeout(MAXTIMEOUT, "floppy init"); 4189 config_types(); 4190 4191 for (i = 0; i < N_FDC; i++) { 4192 fdc = i; 4193 memset(FDCS, 0, sizeof(*FDCS)); 4194 FDCS->dtr = -1; 4195 FDCS->dor = 0x4; 4196 #if defined(__sparc__) || defined(__mc68000__) 4197 /*sparcs/sun3x don't have a DOR reset which we can fall back on to */ 4198 #ifdef __mc68000__ 4199 if (MACH_IS_SUN3X) 4200 #endif 4201 FDCS->version = FDC_82072A; 4202 #endif 4203 } 4204 4205 use_virtual_dma = can_use_virtual_dma & 1; 4206 fdc_state[0].address = FDC1; 4207 if (fdc_state[0].address == -1) { 4208 cancel_delayed_work(&fd_timeout); 4209 err = -ENODEV; 4210 goto out_unreg_region; 4211 } 4212 #if N_FDC > 1 4213 fdc_state[1].address = FDC2; 4214 #endif 4215 4216 fdc = 0; /* reset fdc in case of unexpected interrupt */ 4217 err = floppy_grab_irq_and_dma(); 4218 if (err) { 4219 cancel_delayed_work(&fd_timeout); 4220 err = -EBUSY; 4221 goto out_unreg_region; 4222 } 4223 4224 /* initialise drive state */ 4225 for (drive = 0; drive < N_DRIVE; drive++) { 4226 memset(UDRS, 0, sizeof(*UDRS)); 4227 memset(UDRWE, 0, sizeof(*UDRWE)); 4228 set_bit(FD_DISK_NEWCHANGE_BIT, &UDRS->flags); 4229 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags); 4230 set_bit(FD_VERIFY_BIT, &UDRS->flags); 4231 UDRS->fd_device = -1; 4232 floppy_track_buffer = NULL; 4233 max_buffer_sectors = 0; 4234 } 4235 /* 4236 * Small 10 msec delay to let through any interrupt that 4237 * initialization might have triggered, to not 4238 * confuse detection: 4239 */ 4240 msleep(10); 4241 4242 for (i = 0; i < N_FDC; i++) { 4243 fdc = i; 4244 FDCS->driver_version = FD_DRIVER_VERSION; 4245 for (unit = 0; unit < 4; unit++) 4246 FDCS->track[unit] = 0; 4247 if (FDCS->address == -1) 4248 continue; 4249 FDCS->rawcmd = 2; 4250 if (user_reset_fdc(-1, FD_RESET_ALWAYS, false)) { 4251 /* free ioports reserved by floppy_grab_irq_and_dma() */ 4252 floppy_release_regions(fdc); 4253 FDCS->address = -1; 4254 FDCS->version = FDC_NONE; 4255 continue; 4256 } 4257 /* Try to determine the floppy controller type */ 4258 FDCS->version = get_fdc_version(); 4259 if (FDCS->version == FDC_NONE) { 4260 /* free ioports reserved by floppy_grab_irq_and_dma() */ 4261 floppy_release_regions(fdc); 4262 FDCS->address = -1; 4263 continue; 4264 } 4265 if (can_use_virtual_dma == 2 && FDCS->version < FDC_82072A) 4266 can_use_virtual_dma = 0; 4267 4268 have_no_fdc = 0; 4269 /* Not all FDCs seem to be able to handle the version command 4270 * properly, so force a reset for the standard FDC clones, 4271 * to avoid interrupt garbage. 4272 */ 4273 user_reset_fdc(-1, FD_RESET_ALWAYS, false); 4274 } 4275 fdc = 0; 4276 cancel_delayed_work(&fd_timeout); 4277 current_drive = 0; 4278 initialized = true; 4279 if (have_no_fdc) { 4280 DPRINT("no floppy controllers found\n"); 4281 err = have_no_fdc; 4282 goto out_release_dma; 4283 } 4284 4285 for (drive = 0; drive < N_DRIVE; drive++) { 4286 if (!(allowed_drive_mask & (1 << drive))) 4287 continue; 4288 if (fdc_state[FDC(drive)].version == FDC_NONE) 4289 continue; 4290 4291 floppy_device[drive].name = floppy_device_name; 4292 floppy_device[drive].id = drive; 4293 floppy_device[drive].dev.release = floppy_device_release; 4294 4295 err = platform_device_register(&floppy_device[drive]); 4296 if (err) 4297 goto out_release_dma; 4298 4299 err = device_create_file(&floppy_device[drive].dev, 4300 &dev_attr_cmos); 4301 if (err) 4302 goto out_unreg_platform_dev; 4303 4304 /* to be cleaned up... */ 4305 disks[drive]->private_data = (void *)(long)drive; 4306 disks[drive]->flags |= GENHD_FL_REMOVABLE; 4307 disks[drive]->driverfs_dev = &floppy_device[drive].dev; 4308 add_disk(disks[drive]); 4309 } 4310 4311 return 0; 4312 4313 out_unreg_platform_dev: 4314 platform_device_unregister(&floppy_device[drive]); 4315 out_release_dma: 4316 if (atomic_read(&usage_count)) 4317 floppy_release_irq_and_dma(); 4318 out_unreg_region: 4319 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256); 4320 platform_driver_unregister(&floppy_driver); 4321 out_destroy_workq: 4322 destroy_workqueue(floppy_wq); 4323 out_unreg_blkdev: 4324 unregister_blkdev(FLOPPY_MAJOR, "fd"); 4325 out_put_disk: 4326 while (dr--) { 4327 del_timer_sync(&motor_off_timer[dr]); 4328 if (disks[dr]->queue) { 4329 blk_cleanup_queue(disks[dr]->queue); 4330 /* 4331 * put_disk() is not paired with add_disk() and 4332 * will put queue reference one extra time. fix it. 4333 */ 4334 disks[dr]->queue = NULL; 4335 } 4336 put_disk(disks[dr]); 4337 } 4338 return err; 4339 } 4340 4341 static const struct io_region { 4342 int offset; 4343 int size; 4344 } io_regions[] = { 4345 { 2, 1 }, 4346 /* address + 3 is sometimes reserved by pnp bios for motherboard */ 4347 { 4, 2 }, 4348 /* address + 6 is reserved, and may be taken by IDE. 4349 * Unfortunately, Adaptec doesn't know this :-(, */ 4350 { 7, 1 }, 4351 }; 4352 4353 static void floppy_release_allocated_regions(int fdc, const struct io_region *p) 4354 { 4355 while (p != io_regions) { 4356 p--; 4357 release_region(FDCS->address + p->offset, p->size); 4358 } 4359 } 4360 4361 #define ARRAY_END(X) (&((X)[ARRAY_SIZE(X)])) 4362 4363 static int floppy_request_regions(int fdc) 4364 { 4365 const struct io_region *p; 4366 4367 for (p = io_regions; p < ARRAY_END(io_regions); p++) { 4368 if (!request_region(FDCS->address + p->offset, 4369 p->size, "floppy")) { 4370 DPRINT("Floppy io-port 0x%04lx in use\n", 4371 FDCS->address + p->offset); 4372 floppy_release_allocated_regions(fdc, p); 4373 return -EBUSY; 4374 } 4375 } 4376 return 0; 4377 } 4378 4379 static void floppy_release_regions(int fdc) 4380 { 4381 floppy_release_allocated_regions(fdc, ARRAY_END(io_regions)); 4382 } 4383 4384 static int floppy_grab_irq_and_dma(void) 4385 { 4386 if (atomic_inc_return(&usage_count) > 1) 4387 return 0; 4388 4389 /* 4390 * We might have scheduled a free_irq(), wait it to 4391 * drain first: 4392 */ 4393 flush_workqueue(floppy_wq); 4394 4395 if (fd_request_irq()) { 4396 DPRINT("Unable to grab IRQ%d for the floppy driver\n", 4397 FLOPPY_IRQ); 4398 atomic_dec(&usage_count); 4399 return -1; 4400 } 4401 if (fd_request_dma()) { 4402 DPRINT("Unable to grab DMA%d for the floppy driver\n", 4403 FLOPPY_DMA); 4404 if (can_use_virtual_dma & 2) 4405 use_virtual_dma = can_use_virtual_dma = 1; 4406 if (!(can_use_virtual_dma & 1)) { 4407 fd_free_irq(); 4408 atomic_dec(&usage_count); 4409 return -1; 4410 } 4411 } 4412 4413 for (fdc = 0; fdc < N_FDC; fdc++) { 4414 if (FDCS->address != -1) { 4415 if (floppy_request_regions(fdc)) 4416 goto cleanup; 4417 } 4418 } 4419 for (fdc = 0; fdc < N_FDC; fdc++) { 4420 if (FDCS->address != -1) { 4421 reset_fdc_info(1); 4422 fd_outb(FDCS->dor, FD_DOR); 4423 } 4424 } 4425 fdc = 0; 4426 set_dor(0, ~0, 8); /* avoid immediate interrupt */ 4427 4428 for (fdc = 0; fdc < N_FDC; fdc++) 4429 if (FDCS->address != -1) 4430 fd_outb(FDCS->dor, FD_DOR); 4431 /* 4432 * The driver will try and free resources and relies on us 4433 * to know if they were allocated or not. 4434 */ 4435 fdc = 0; 4436 irqdma_allocated = 1; 4437 return 0; 4438 cleanup: 4439 fd_free_irq(); 4440 fd_free_dma(); 4441 while (--fdc >= 0) 4442 floppy_release_regions(fdc); 4443 atomic_dec(&usage_count); 4444 return -1; 4445 } 4446 4447 static void floppy_release_irq_and_dma(void) 4448 { 4449 int old_fdc; 4450 #ifndef __sparc__ 4451 int drive; 4452 #endif 4453 long tmpsize; 4454 unsigned long tmpaddr; 4455 4456 if (!atomic_dec_and_test(&usage_count)) 4457 return; 4458 4459 if (irqdma_allocated) { 4460 fd_disable_dma(); 4461 fd_free_dma(); 4462 fd_free_irq(); 4463 irqdma_allocated = 0; 4464 } 4465 set_dor(0, ~0, 8); 4466 #if N_FDC > 1 4467 set_dor(1, ~8, 0); 4468 #endif 4469 4470 if (floppy_track_buffer && max_buffer_sectors) { 4471 tmpsize = max_buffer_sectors * 1024; 4472 tmpaddr = (unsigned long)floppy_track_buffer; 4473 floppy_track_buffer = NULL; 4474 max_buffer_sectors = 0; 4475 buffer_min = buffer_max = -1; 4476 fd_dma_mem_free(tmpaddr, tmpsize); 4477 } 4478 #ifndef __sparc__ 4479 for (drive = 0; drive < N_FDC * 4; drive++) 4480 if (timer_pending(motor_off_timer + drive)) 4481 pr_info("motor off timer %d still active\n", drive); 4482 #endif 4483 4484 if (delayed_work_pending(&fd_timeout)) 4485 pr_info("floppy timer still active:%s\n", timeout_message); 4486 if (delayed_work_pending(&fd_timer)) 4487 pr_info("auxiliary floppy timer still active\n"); 4488 if (work_pending(&floppy_work)) 4489 pr_info("work still pending\n"); 4490 old_fdc = fdc; 4491 for (fdc = 0; fdc < N_FDC; fdc++) 4492 if (FDCS->address != -1) 4493 floppy_release_regions(fdc); 4494 fdc = old_fdc; 4495 } 4496 4497 #ifdef MODULE 4498 4499 static char *floppy; 4500 4501 static void __init parse_floppy_cfg_string(char *cfg) 4502 { 4503 char *ptr; 4504 4505 while (*cfg) { 4506 ptr = cfg; 4507 while (*cfg && *cfg != ' ' && *cfg != '\t') 4508 cfg++; 4509 if (*cfg) { 4510 *cfg = '\0'; 4511 cfg++; 4512 } 4513 if (*ptr) 4514 floppy_setup(ptr); 4515 } 4516 } 4517 4518 static int __init floppy_module_init(void) 4519 { 4520 if (floppy) 4521 parse_floppy_cfg_string(floppy); 4522 return floppy_init(); 4523 } 4524 module_init(floppy_module_init); 4525 4526 static void __exit floppy_module_exit(void) 4527 { 4528 int drive; 4529 4530 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256); 4531 unregister_blkdev(FLOPPY_MAJOR, "fd"); 4532 platform_driver_unregister(&floppy_driver); 4533 4534 for (drive = 0; drive < N_DRIVE; drive++) { 4535 del_timer_sync(&motor_off_timer[drive]); 4536 4537 if ((allowed_drive_mask & (1 << drive)) && 4538 fdc_state[FDC(drive)].version != FDC_NONE) { 4539 del_gendisk(disks[drive]); 4540 device_remove_file(&floppy_device[drive].dev, &dev_attr_cmos); 4541 platform_device_unregister(&floppy_device[drive]); 4542 } 4543 blk_cleanup_queue(disks[drive]->queue); 4544 4545 /* 4546 * These disks have not called add_disk(). Don't put down 4547 * queue reference in put_disk(). 4548 */ 4549 if (!(allowed_drive_mask & (1 << drive)) || 4550 fdc_state[FDC(drive)].version == FDC_NONE) 4551 disks[drive]->queue = NULL; 4552 4553 put_disk(disks[drive]); 4554 } 4555 4556 cancel_delayed_work_sync(&fd_timeout); 4557 cancel_delayed_work_sync(&fd_timer); 4558 destroy_workqueue(floppy_wq); 4559 4560 if (atomic_read(&usage_count)) 4561 floppy_release_irq_and_dma(); 4562 4563 /* eject disk, if any */ 4564 fd_eject(0); 4565 } 4566 4567 module_exit(floppy_module_exit); 4568 4569 module_param(floppy, charp, 0); 4570 module_param(FLOPPY_IRQ, int, 0); 4571 module_param(FLOPPY_DMA, int, 0); 4572 MODULE_AUTHOR("Alain L. Knaff"); 4573 MODULE_SUPPORTED_DEVICE("fd"); 4574 MODULE_LICENSE("GPL"); 4575 4576 /* This doesn't actually get used other than for module information */ 4577 static const struct pnp_device_id floppy_pnpids[] = { 4578 {"PNP0700", 0}, 4579 {} 4580 }; 4581 4582 MODULE_DEVICE_TABLE(pnp, floppy_pnpids); 4583 4584 #else 4585 4586 __setup("floppy=", floppy_setup); 4587 module_init(floppy_init) 4588 #endif 4589 4590 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR); 4591