1 /* 2 * linux/amiga/amiflop.c 3 * 4 * Copyright (C) 1993 Greg Harp 5 * Portions of this driver are based on code contributed by Brad Pepers 6 * 7 * revised 28.5.95 by Joerg Dorchain 8 * - now no bugs(?) any more for both HD & DD 9 * - added support for 40 Track 5.25" drives, 80-track hopefully behaves 10 * like 3.5" dd (no way to test - are there any 5.25" drives out there 11 * that work on an A4000?) 12 * - wrote formatting routine (maybe dirty, but works) 13 * 14 * june/july 1995 added ms-dos support by Joerg Dorchain 15 * (portions based on messydos.device and various contributors) 16 * - currently only 9 and 18 sector disks 17 * 18 * - fixed a bug with the internal trackbuffer when using multiple 19 * disks the same time 20 * - made formatting a bit safer 21 * - added command line and machine based default for "silent" df0 22 * 23 * december 1995 adapted for 1.2.13pl4 by Joerg Dorchain 24 * - works but I think it's inefficient. (look in redo_fd_request) 25 * But the changes were very efficient. (only three and a half lines) 26 * 27 * january 1996 added special ioctl for tracking down read/write problems 28 * - usage ioctl(d, RAW_TRACK, ptr); the raw track buffer (MFM-encoded data 29 * is copied to area. (area should be large enough since no checking is 30 * done - 30K is currently sufficient). return the actual size of the 31 * trackbuffer 32 * - replaced udelays() by a timer (CIAA timer B) for the waits 33 * needed for the disk mechanic. 34 * 35 * february 1996 fixed error recovery and multiple disk access 36 * - both got broken the first time I tampered with the driver :-( 37 * - still not safe, but better than before 38 * 39 * revised Marts 3rd, 1996 by Jes Sorensen for use in the 1.3.28 kernel. 40 * - Minor changes to accept the kdev_t. 41 * - Replaced some more udelays with ms_delays. Udelay is just a loop, 42 * and so the delay will be different depending on the given 43 * processor :-( 44 * - The driver could use a major cleanup because of the new 45 * major/minor handling that came with kdev_t. It seems to work for 46 * the time being, but I can't guarantee that it will stay like 47 * that when we start using 16 (24?) bit minors. 48 * 49 * restructured jan 1997 by Joerg Dorchain 50 * - Fixed Bug accessing multiple disks 51 * - some code cleanup 52 * - added trackbuffer for each drive to speed things up 53 * - fixed some race conditions (who finds the next may send it to me ;-) 54 */ 55 56 #include <linux/module.h> 57 #include <linux/slab.h> 58 59 #include <linux/fd.h> 60 #include <linux/hdreg.h> 61 #include <linux/delay.h> 62 #include <linux/init.h> 63 #include <linux/mutex.h> 64 #include <linux/amifdreg.h> 65 #include <linux/amifd.h> 66 #include <linux/fs.h> 67 #include <linux/blkdev.h> 68 #include <linux/elevator.h> 69 #include <linux/interrupt.h> 70 #include <linux/platform_device.h> 71 72 #include <asm/setup.h> 73 #include <linux/uaccess.h> 74 #include <asm/amigahw.h> 75 #include <asm/amigaints.h> 76 #include <asm/irq.h> 77 78 #undef DEBUG /* print _LOTS_ of infos */ 79 80 #define RAW_IOCTL 81 #ifdef RAW_IOCTL 82 #define IOCTL_RAW_TRACK 0x5254524B /* 'RTRK' */ 83 #endif 84 85 /* 86 * Defines 87 */ 88 89 /* 90 * Error codes 91 */ 92 #define FD_OK 0 /* operation succeeded */ 93 #define FD_ERROR -1 /* general error (seek, read, write, etc) */ 94 #define FD_NOUNIT 1 /* unit does not exist */ 95 #define FD_UNITBUSY 2 /* unit already active */ 96 #define FD_NOTACTIVE 3 /* unit is not active */ 97 #define FD_NOTREADY 4 /* unit is not ready (motor not on/no disk) */ 98 99 #define MFM_NOSYNC 1 100 #define MFM_HEADER 2 101 #define MFM_DATA 3 102 #define MFM_TRACK 4 103 104 /* 105 * Floppy ID values 106 */ 107 #define FD_NODRIVE 0x00000000 /* response when no unit is present */ 108 #define FD_DD_3 0xffffffff /* double-density 3.5" (880K) drive */ 109 #define FD_HD_3 0x55555555 /* high-density 3.5" (1760K) drive */ 110 #define FD_DD_5 0xaaaaaaaa /* double-density 5.25" (440K) drive */ 111 112 static DEFINE_MUTEX(amiflop_mutex); 113 static unsigned long int fd_def_df0 = FD_DD_3; /* default for df0 if it doesn't identify */ 114 115 module_param(fd_def_df0, ulong, 0); 116 MODULE_LICENSE("GPL"); 117 118 /* 119 * Macros 120 */ 121 #define MOTOR_ON (ciab.prb &= ~DSKMOTOR) 122 #define MOTOR_OFF (ciab.prb |= DSKMOTOR) 123 #define SELECT(mask) (ciab.prb &= ~mask) 124 #define DESELECT(mask) (ciab.prb |= mask) 125 #define SELMASK(drive) (1 << (3 + (drive & 3))) 126 127 static struct fd_drive_type drive_types[] = { 128 /* code name tr he rdsz wrsz sm pc1 pc2 sd st st*/ 129 /* warning: times are now in milliseconds (ms) */ 130 { FD_DD_3, "DD 3.5", 80, 2, 14716, 13630, 1, 80,161, 3, 18, 1}, 131 { FD_HD_3, "HD 3.5", 80, 2, 28344, 27258, 2, 80,161, 3, 18, 1}, 132 { FD_DD_5, "DD 5.25", 40, 2, 14716, 13630, 1, 40, 81, 6, 30, 2}, 133 { FD_NODRIVE, "No Drive", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} 134 }; 135 static int num_dr_types = ARRAY_SIZE(drive_types); 136 137 static int amiga_read(int), dos_read(int); 138 static void amiga_write(int), dos_write(int); 139 static struct fd_data_type data_types[] = { 140 { "Amiga", 11 , amiga_read, amiga_write}, 141 { "MS-Dos", 9, dos_read, dos_write} 142 }; 143 144 /* current info on each unit */ 145 static struct amiga_floppy_struct unit[FD_MAX_UNITS]; 146 147 static struct timer_list flush_track_timer[FD_MAX_UNITS]; 148 static struct timer_list post_write_timer; 149 static struct timer_list motor_on_timer; 150 static struct timer_list motor_off_timer[FD_MAX_UNITS]; 151 static int on_attempts; 152 153 /* Synchronization of FDC access */ 154 /* request loop (trackbuffer) */ 155 static volatile int fdc_busy = -1; 156 static volatile int fdc_nested; 157 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait); 158 159 static DECLARE_COMPLETION(motor_on_completion); 160 161 static volatile int selected = -1; /* currently selected drive */ 162 163 static int writepending; 164 static int writefromint; 165 static char *raw_buf; 166 static int fdc_queue; 167 168 static DEFINE_SPINLOCK(amiflop_lock); 169 170 #define RAW_BUF_SIZE 30000 /* size of raw disk data */ 171 172 /* 173 * These are global variables, as that's the easiest way to give 174 * information to interrupts. They are the data used for the current 175 * request. 176 */ 177 static volatile char block_flag; 178 static DECLARE_WAIT_QUEUE_HEAD(wait_fd_block); 179 180 /* MS-Dos MFM Coding tables (should go quick and easy) */ 181 static unsigned char mfmencode[16]={ 182 0x2a, 0x29, 0x24, 0x25, 0x12, 0x11, 0x14, 0x15, 183 0x4a, 0x49, 0x44, 0x45, 0x52, 0x51, 0x54, 0x55 184 }; 185 static unsigned char mfmdecode[128]; 186 187 /* floppy internal millisecond timer stuff */ 188 static DECLARE_COMPLETION(ms_wait_completion); 189 #define MS_TICKS ((amiga_eclock+50)/1000) 190 191 /* 192 * Note that MAX_ERRORS=X doesn't imply that we retry every bad read 193 * max X times - some types of errors increase the errorcount by 2 or 194 * even 3, so we might actually retry only X/2 times before giving up. 195 */ 196 #define MAX_ERRORS 12 197 198 #define custom amiga_custom 199 200 /* Prevent "aliased" accesses. */ 201 static int fd_ref[4] = { 0,0,0,0 }; 202 static int fd_device[4] = { 0, 0, 0, 0 }; 203 204 /* 205 * Here come the actual hardware access and helper functions. 206 * They are not reentrant and single threaded because all drives 207 * share the same hardware and the same trackbuffer. 208 */ 209 210 /* Milliseconds timer */ 211 212 static irqreturn_t ms_isr(int irq, void *dummy) 213 { 214 complete(&ms_wait_completion); 215 return IRQ_HANDLED; 216 } 217 218 /* all waits are queued up 219 A more generic routine would do a schedule a la timer.device */ 220 static void ms_delay(int ms) 221 { 222 int ticks; 223 static DEFINE_MUTEX(mutex); 224 225 if (ms > 0) { 226 mutex_lock(&mutex); 227 ticks = MS_TICKS*ms-1; 228 ciaa.tblo=ticks%256; 229 ciaa.tbhi=ticks/256; 230 ciaa.crb=0x19; /*count eclock, force load, one-shoot, start */ 231 wait_for_completion(&ms_wait_completion); 232 mutex_unlock(&mutex); 233 } 234 } 235 236 /* Hardware semaphore */ 237 238 /* returns true when we would get the semaphore */ 239 static inline int try_fdc(int drive) 240 { 241 drive &= 3; 242 return ((fdc_busy < 0) || (fdc_busy == drive)); 243 } 244 245 static void get_fdc(int drive) 246 { 247 unsigned long flags; 248 249 drive &= 3; 250 #ifdef DEBUG 251 printk("get_fdc: drive %d fdc_busy %d fdc_nested %d\n",drive,fdc_busy,fdc_nested); 252 #endif 253 local_irq_save(flags); 254 wait_event(fdc_wait, try_fdc(drive)); 255 fdc_busy = drive; 256 fdc_nested++; 257 local_irq_restore(flags); 258 } 259 260 static inline void rel_fdc(void) 261 { 262 #ifdef DEBUG 263 if (fdc_nested == 0) 264 printk("fd: unmatched rel_fdc\n"); 265 printk("rel_fdc: fdc_busy %d fdc_nested %d\n",fdc_busy,fdc_nested); 266 #endif 267 fdc_nested--; 268 if (fdc_nested == 0) { 269 fdc_busy = -1; 270 wake_up(&fdc_wait); 271 } 272 } 273 274 static void fd_select (int drive) 275 { 276 unsigned char prb = ~0; 277 278 drive&=3; 279 #ifdef DEBUG 280 printk("selecting %d\n",drive); 281 #endif 282 if (drive == selected) 283 return; 284 get_fdc(drive); 285 selected = drive; 286 287 if (unit[drive].track % 2 != 0) 288 prb &= ~DSKSIDE; 289 if (unit[drive].motor == 1) 290 prb &= ~DSKMOTOR; 291 ciab.prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3)); 292 ciab.prb = prb; 293 prb &= ~SELMASK(drive); 294 ciab.prb = prb; 295 rel_fdc(); 296 } 297 298 static void fd_deselect (int drive) 299 { 300 unsigned char prb; 301 unsigned long flags; 302 303 drive&=3; 304 #ifdef DEBUG 305 printk("deselecting %d\n",drive); 306 #endif 307 if (drive != selected) { 308 printk(KERN_WARNING "Deselecting drive %d while %d was selected!\n",drive,selected); 309 return; 310 } 311 312 get_fdc(drive); 313 local_irq_save(flags); 314 315 selected = -1; 316 317 prb = ciab.prb; 318 prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3)); 319 ciab.prb = prb; 320 321 local_irq_restore (flags); 322 rel_fdc(); 323 324 } 325 326 static void motor_on_callback(unsigned long ignored) 327 { 328 if (!(ciaa.pra & DSKRDY) || --on_attempts == 0) { 329 complete_all(&motor_on_completion); 330 } else { 331 motor_on_timer.expires = jiffies + HZ/10; 332 add_timer(&motor_on_timer); 333 } 334 } 335 336 static int fd_motor_on(int nr) 337 { 338 nr &= 3; 339 340 del_timer(motor_off_timer + nr); 341 342 if (!unit[nr].motor) { 343 unit[nr].motor = 1; 344 fd_select(nr); 345 346 reinit_completion(&motor_on_completion); 347 mod_timer(&motor_on_timer, jiffies + HZ/2); 348 349 on_attempts = 10; 350 wait_for_completion(&motor_on_completion); 351 fd_deselect(nr); 352 } 353 354 if (on_attempts == 0) { 355 on_attempts = -1; 356 #if 0 357 printk (KERN_ERR "motor_on failed, turning motor off\n"); 358 fd_motor_off (nr); 359 return 0; 360 #else 361 printk (KERN_WARNING "DSKRDY not set after 1.5 seconds - assuming drive is spinning notwithstanding\n"); 362 #endif 363 } 364 365 return 1; 366 } 367 368 static void fd_motor_off(unsigned long drive) 369 { 370 long calledfromint; 371 #ifdef MODULE 372 long decusecount; 373 374 decusecount = drive & 0x40000000; 375 #endif 376 calledfromint = drive & 0x80000000; 377 drive&=3; 378 if (calledfromint && !try_fdc(drive)) { 379 /* We would be blocked in an interrupt, so try again later */ 380 motor_off_timer[drive].expires = jiffies + 1; 381 add_timer(motor_off_timer + drive); 382 return; 383 } 384 unit[drive].motor = 0; 385 fd_select(drive); 386 udelay (1); 387 fd_deselect(drive); 388 } 389 390 static void floppy_off (unsigned int nr) 391 { 392 int drive; 393 394 drive = nr & 3; 395 /* called this way it is always from interrupt */ 396 motor_off_timer[drive].data = nr | 0x80000000; 397 mod_timer(motor_off_timer + drive, jiffies + 3*HZ); 398 } 399 400 static int fd_calibrate(int drive) 401 { 402 unsigned char prb; 403 int n; 404 405 drive &= 3; 406 get_fdc(drive); 407 if (!fd_motor_on (drive)) 408 return 0; 409 fd_select (drive); 410 prb = ciab.prb; 411 prb |= DSKSIDE; 412 prb &= ~DSKDIREC; 413 ciab.prb = prb; 414 for (n = unit[drive].type->tracks/2; n != 0; --n) { 415 if (ciaa.pra & DSKTRACK0) 416 break; 417 prb &= ~DSKSTEP; 418 ciab.prb = prb; 419 prb |= DSKSTEP; 420 udelay (2); 421 ciab.prb = prb; 422 ms_delay(unit[drive].type->step_delay); 423 } 424 ms_delay (unit[drive].type->settle_time); 425 prb |= DSKDIREC; 426 n = unit[drive].type->tracks + 20; 427 for (;;) { 428 prb &= ~DSKSTEP; 429 ciab.prb = prb; 430 prb |= DSKSTEP; 431 udelay (2); 432 ciab.prb = prb; 433 ms_delay(unit[drive].type->step_delay + 1); 434 if ((ciaa.pra & DSKTRACK0) == 0) 435 break; 436 if (--n == 0) { 437 printk (KERN_ERR "fd%d: calibrate failed, turning motor off\n", drive); 438 fd_motor_off (drive); 439 unit[drive].track = -1; 440 rel_fdc(); 441 return 0; 442 } 443 } 444 unit[drive].track = 0; 445 ms_delay(unit[drive].type->settle_time); 446 447 rel_fdc(); 448 fd_deselect(drive); 449 return 1; 450 } 451 452 static int fd_seek(int drive, int track) 453 { 454 unsigned char prb; 455 int cnt; 456 457 #ifdef DEBUG 458 printk("seeking drive %d to track %d\n",drive,track); 459 #endif 460 drive &= 3; 461 get_fdc(drive); 462 if (unit[drive].track == track) { 463 rel_fdc(); 464 return 1; 465 } 466 if (!fd_motor_on(drive)) { 467 rel_fdc(); 468 return 0; 469 } 470 if (unit[drive].track < 0 && !fd_calibrate(drive)) { 471 rel_fdc(); 472 return 0; 473 } 474 475 fd_select (drive); 476 cnt = unit[drive].track/2 - track/2; 477 prb = ciab.prb; 478 prb |= DSKSIDE | DSKDIREC; 479 if (track % 2 != 0) 480 prb &= ~DSKSIDE; 481 if (cnt < 0) { 482 cnt = - cnt; 483 prb &= ~DSKDIREC; 484 } 485 ciab.prb = prb; 486 if (track % 2 != unit[drive].track % 2) 487 ms_delay (unit[drive].type->side_time); 488 unit[drive].track = track; 489 if (cnt == 0) { 490 rel_fdc(); 491 fd_deselect(drive); 492 return 1; 493 } 494 do { 495 prb &= ~DSKSTEP; 496 ciab.prb = prb; 497 prb |= DSKSTEP; 498 udelay (1); 499 ciab.prb = prb; 500 ms_delay (unit[drive].type->step_delay); 501 } while (--cnt != 0); 502 ms_delay (unit[drive].type->settle_time); 503 504 rel_fdc(); 505 fd_deselect(drive); 506 return 1; 507 } 508 509 static unsigned long fd_get_drive_id(int drive) 510 { 511 int i; 512 ulong id = 0; 513 514 drive&=3; 515 get_fdc(drive); 516 /* set up for ID */ 517 MOTOR_ON; 518 udelay(2); 519 SELECT(SELMASK(drive)); 520 udelay(2); 521 DESELECT(SELMASK(drive)); 522 udelay(2); 523 MOTOR_OFF; 524 udelay(2); 525 SELECT(SELMASK(drive)); 526 udelay(2); 527 DESELECT(SELMASK(drive)); 528 udelay(2); 529 530 /* loop and read disk ID */ 531 for (i=0; i<32; i++) { 532 SELECT(SELMASK(drive)); 533 udelay(2); 534 535 /* read and store value of DSKRDY */ 536 id <<= 1; 537 id |= (ciaa.pra & DSKRDY) ? 0 : 1; /* cia regs are low-active! */ 538 539 DESELECT(SELMASK(drive)); 540 } 541 542 rel_fdc(); 543 544 /* 545 * RB: At least A500/A2000's df0: don't identify themselves. 546 * As every (real) Amiga has at least a 3.5" DD drive as df0: 547 * we default to that if df0: doesn't identify as a certain 548 * type. 549 */ 550 if(drive == 0 && id == FD_NODRIVE) 551 { 552 id = fd_def_df0; 553 printk(KERN_NOTICE "fd: drive 0 didn't identify, setting default %08lx\n", (ulong)fd_def_df0); 554 } 555 /* return the ID value */ 556 return (id); 557 } 558 559 static irqreturn_t fd_block_done(int irq, void *dummy) 560 { 561 if (block_flag) 562 custom.dsklen = 0x4000; 563 564 if (block_flag == 2) { /* writing */ 565 writepending = 2; 566 post_write_timer.expires = jiffies + 1; /* at least 2 ms */ 567 post_write_timer.data = selected; 568 add_timer(&post_write_timer); 569 } 570 else { /* reading */ 571 block_flag = 0; 572 wake_up (&wait_fd_block); 573 } 574 return IRQ_HANDLED; 575 } 576 577 static void raw_read(int drive) 578 { 579 drive&=3; 580 get_fdc(drive); 581 wait_event(wait_fd_block, !block_flag); 582 fd_select(drive); 583 /* setup adkcon bits correctly */ 584 custom.adkcon = ADK_MSBSYNC; 585 custom.adkcon = ADK_SETCLR|ADK_WORDSYNC|ADK_FAST; 586 587 custom.dsksync = MFM_SYNC; 588 589 custom.dsklen = 0; 590 custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf); 591 custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN; 592 custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN; 593 594 block_flag = 1; 595 596 wait_event(wait_fd_block, !block_flag); 597 598 custom.dsklen = 0; 599 fd_deselect(drive); 600 rel_fdc(); 601 } 602 603 static int raw_write(int drive) 604 { 605 ushort adk; 606 607 drive&=3; 608 get_fdc(drive); /* corresponds to rel_fdc() in post_write() */ 609 if ((ciaa.pra & DSKPROT) == 0) { 610 rel_fdc(); 611 return 0; 612 } 613 wait_event(wait_fd_block, !block_flag); 614 fd_select(drive); 615 /* clear adkcon bits */ 616 custom.adkcon = ADK_PRECOMP1|ADK_PRECOMP0|ADK_WORDSYNC|ADK_MSBSYNC; 617 /* set appropriate adkcon bits */ 618 adk = ADK_SETCLR|ADK_FAST; 619 if ((ulong)unit[drive].track >= unit[drive].type->precomp2) 620 adk |= ADK_PRECOMP1; 621 else if ((ulong)unit[drive].track >= unit[drive].type->precomp1) 622 adk |= ADK_PRECOMP0; 623 custom.adkcon = adk; 624 625 custom.dsklen = DSKLEN_WRITE; 626 custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf); 627 custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE; 628 custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE; 629 630 block_flag = 2; 631 return 1; 632 } 633 634 /* 635 * to be called at least 2ms after the write has finished but before any 636 * other access to the hardware. 637 */ 638 static void post_write (unsigned long drive) 639 { 640 #ifdef DEBUG 641 printk("post_write for drive %ld\n",drive); 642 #endif 643 drive &= 3; 644 custom.dsklen = 0; 645 block_flag = 0; 646 writepending = 0; 647 writefromint = 0; 648 unit[drive].dirty = 0; 649 wake_up(&wait_fd_block); 650 fd_deselect(drive); 651 rel_fdc(); /* corresponds to get_fdc() in raw_write */ 652 } 653 654 655 /* 656 * The following functions are to convert the block contents into raw data 657 * written to disk and vice versa. 658 * (Add other formats here ;-)) 659 */ 660 661 static unsigned long scan_sync(unsigned long raw, unsigned long end) 662 { 663 ushort *ptr = (ushort *)raw, *endp = (ushort *)end; 664 665 while (ptr < endp && *ptr++ != 0x4489) 666 ; 667 if (ptr < endp) { 668 while (*ptr == 0x4489 && ptr < endp) 669 ptr++; 670 return (ulong)ptr; 671 } 672 return 0; 673 } 674 675 static inline unsigned long checksum(unsigned long *addr, int len) 676 { 677 unsigned long csum = 0; 678 679 len /= sizeof(*addr); 680 while (len-- > 0) 681 csum ^= *addr++; 682 csum = ((csum>>1) & 0x55555555) ^ (csum & 0x55555555); 683 684 return csum; 685 } 686 687 static unsigned long decode (unsigned long *data, unsigned long *raw, 688 int len) 689 { 690 ulong *odd, *even; 691 692 /* convert length from bytes to longwords */ 693 len >>= 2; 694 odd = raw; 695 even = odd + len; 696 697 /* prepare return pointer */ 698 raw += len * 2; 699 700 do { 701 *data++ = ((*odd++ & 0x55555555) << 1) | (*even++ & 0x55555555); 702 } while (--len != 0); 703 704 return (ulong)raw; 705 } 706 707 struct header { 708 unsigned char magic; 709 unsigned char track; 710 unsigned char sect; 711 unsigned char ord; 712 unsigned char labels[16]; 713 unsigned long hdrchk; 714 unsigned long datachk; 715 }; 716 717 static int amiga_read(int drive) 718 { 719 unsigned long raw; 720 unsigned long end; 721 int scnt; 722 unsigned long csum; 723 struct header hdr; 724 725 drive&=3; 726 raw = (long) raw_buf; 727 end = raw + unit[drive].type->read_size; 728 729 for (scnt = 0;scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) { 730 if (!(raw = scan_sync(raw, end))) { 731 printk (KERN_INFO "can't find sync for sector %d\n", scnt); 732 return MFM_NOSYNC; 733 } 734 735 raw = decode ((ulong *)&hdr.magic, (ulong *)raw, 4); 736 raw = decode ((ulong *)&hdr.labels, (ulong *)raw, 16); 737 raw = decode ((ulong *)&hdr.hdrchk, (ulong *)raw, 4); 738 raw = decode ((ulong *)&hdr.datachk, (ulong *)raw, 4); 739 csum = checksum((ulong *)&hdr, 740 (char *)&hdr.hdrchk-(char *)&hdr); 741 742 #ifdef DEBUG 743 printk ("(%x,%d,%d,%d) (%lx,%lx,%lx,%lx) %lx %lx\n", 744 hdr.magic, hdr.track, hdr.sect, hdr.ord, 745 *(ulong *)&hdr.labels[0], *(ulong *)&hdr.labels[4], 746 *(ulong *)&hdr.labels[8], *(ulong *)&hdr.labels[12], 747 hdr.hdrchk, hdr.datachk); 748 #endif 749 750 if (hdr.hdrchk != csum) { 751 printk(KERN_INFO "MFM_HEADER: %08lx,%08lx\n", hdr.hdrchk, csum); 752 return MFM_HEADER; 753 } 754 755 /* verify track */ 756 if (hdr.track != unit[drive].track) { 757 printk(KERN_INFO "MFM_TRACK: %d, %d\n", hdr.track, unit[drive].track); 758 return MFM_TRACK; 759 } 760 761 raw = decode ((ulong *)(unit[drive].trackbuf + hdr.sect*512), 762 (ulong *)raw, 512); 763 csum = checksum((ulong *)(unit[drive].trackbuf + hdr.sect*512), 512); 764 765 if (hdr.datachk != csum) { 766 printk(KERN_INFO "MFM_DATA: (%x:%d:%d:%d) sc=%d %lx, %lx\n", 767 hdr.magic, hdr.track, hdr.sect, hdr.ord, scnt, 768 hdr.datachk, csum); 769 printk (KERN_INFO "data=(%lx,%lx,%lx,%lx)\n", 770 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[0], 771 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[1], 772 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[2], 773 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[3]); 774 return MFM_DATA; 775 } 776 } 777 778 return 0; 779 } 780 781 static void encode(unsigned long data, unsigned long *dest) 782 { 783 unsigned long data2; 784 785 data &= 0x55555555; 786 data2 = data ^ 0x55555555; 787 data |= ((data2 >> 1) | 0x80000000) & (data2 << 1); 788 789 if (*(dest - 1) & 0x00000001) 790 data &= 0x7FFFFFFF; 791 792 *dest = data; 793 } 794 795 static void encode_block(unsigned long *dest, unsigned long *src, int len) 796 { 797 int cnt, to_cnt = 0; 798 unsigned long data; 799 800 /* odd bits */ 801 for (cnt = 0; cnt < len / 4; cnt++) { 802 data = src[cnt] >> 1; 803 encode(data, dest + to_cnt++); 804 } 805 806 /* even bits */ 807 for (cnt = 0; cnt < len / 4; cnt++) { 808 data = src[cnt]; 809 encode(data, dest + to_cnt++); 810 } 811 } 812 813 static unsigned long *putsec(int disk, unsigned long *raw, int cnt) 814 { 815 struct header hdr; 816 int i; 817 818 disk&=3; 819 *raw = (raw[-1]&1) ? 0x2AAAAAAA : 0xAAAAAAAA; 820 raw++; 821 *raw++ = 0x44894489; 822 823 hdr.magic = 0xFF; 824 hdr.track = unit[disk].track; 825 hdr.sect = cnt; 826 hdr.ord = unit[disk].dtype->sects * unit[disk].type->sect_mult - cnt; 827 for (i = 0; i < 16; i++) 828 hdr.labels[i] = 0; 829 hdr.hdrchk = checksum((ulong *)&hdr, 830 (char *)&hdr.hdrchk-(char *)&hdr); 831 hdr.datachk = checksum((ulong *)(unit[disk].trackbuf+cnt*512), 512); 832 833 encode_block(raw, (ulong *)&hdr.magic, 4); 834 raw += 2; 835 encode_block(raw, (ulong *)&hdr.labels, 16); 836 raw += 8; 837 encode_block(raw, (ulong *)&hdr.hdrchk, 4); 838 raw += 2; 839 encode_block(raw, (ulong *)&hdr.datachk, 4); 840 raw += 2; 841 encode_block(raw, (ulong *)(unit[disk].trackbuf+cnt*512), 512); 842 raw += 256; 843 844 return raw; 845 } 846 847 static void amiga_write(int disk) 848 { 849 unsigned int cnt; 850 unsigned long *ptr = (unsigned long *)raw_buf; 851 852 disk&=3; 853 /* gap space */ 854 for (cnt = 0; cnt < 415 * unit[disk].type->sect_mult; cnt++) 855 *ptr++ = 0xaaaaaaaa; 856 857 /* sectors */ 858 for (cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++) 859 ptr = putsec (disk, ptr, cnt); 860 *(ushort *)ptr = (ptr[-1]&1) ? 0x2AA8 : 0xAAA8; 861 } 862 863 864 struct dos_header { 865 unsigned char track, /* 0-80 */ 866 side, /* 0-1 */ 867 sec, /* 0-...*/ 868 len_desc;/* 2 */ 869 unsigned short crc; /* on 68000 we got an alignment problem, 870 but this compiler solves it by adding silently 871 adding a pad byte so data won't fit 872 and this took about 3h to discover.... */ 873 unsigned char gap1[22]; /* for longword-alignedness (0x4e) */ 874 }; 875 876 /* crc routines are borrowed from the messydos-handler */ 877 878 /* excerpt from the messydos-device 879 ; The CRC is computed not only over the actual data, but including 880 ; the SYNC mark (3 * $a1) and the 'ID/DATA - Address Mark' ($fe/$fb). 881 ; As we don't read or encode these fields into our buffers, we have to 882 ; preload the registers containing the CRC with the values they would have 883 ; after stepping over these fields. 884 ; 885 ; How CRCs "really" work: 886 ; 887 ; First, you should regard a bitstring as a series of coefficients of 888 ; polynomials. We calculate with these polynomials in modulo-2 889 ; arithmetic, in which both add and subtract are done the same as 890 ; exclusive-or. Now, we modify our data (a very long polynomial) in 891 ; such a way that it becomes divisible by the CCITT-standard 16-bit 892 ; 16 12 5 893 ; polynomial: x + x + x + 1, represented by $11021. The easiest 894 ; way to do this would be to multiply (using proper arithmetic) our 895 ; datablock with $11021. So we have: 896 ; data * $11021 = 897 ; data * ($10000 + $1021) = 898 ; data * $10000 + data * $1021 899 ; The left part of this is simple: Just add two 0 bytes. But then 900 ; the right part (data $1021) remains difficult and even could have 901 ; a carry into the left part. The solution is to use a modified 902 ; multiplication, which has a result that is not correct, but with 903 ; a difference of any multiple of $11021. We then only need to keep 904 ; the 16 least significant bits of the result. 905 ; 906 ; The following algorithm does this for us: 907 ; 908 ; unsigned char *data, c, crclo, crchi; 909 ; while (not done) { 910 ; c = *data++ + crchi; 911 ; crchi = (@ c) >> 8 + crclo; 912 ; crclo = @ c; 913 ; } 914 ; 915 ; Remember, + is done with EOR, the @ operator is in two tables (high 916 ; and low byte separately), which is calculated as 917 ; 918 ; $1021 * (c & $F0) 919 ; xor $1021 * (c & $0F) 920 ; xor $1021 * (c >> 4) (* is regular multiplication) 921 ; 922 ; 923 ; Anyway, the end result is the same as the remainder of the division of 924 ; the data by $11021. I am afraid I need to study theory a bit more... 925 926 927 my only works was to code this from manx to C.... 928 929 */ 930 931 static ushort dos_crc(void * data_a3, int data_d0, int data_d1, int data_d3) 932 { 933 static unsigned char CRCTable1[] = { 934 0x00,0x10,0x20,0x30,0x40,0x50,0x60,0x70,0x81,0x91,0xa1,0xb1,0xc1,0xd1,0xe1,0xf1, 935 0x12,0x02,0x32,0x22,0x52,0x42,0x72,0x62,0x93,0x83,0xb3,0xa3,0xd3,0xc3,0xf3,0xe3, 936 0x24,0x34,0x04,0x14,0x64,0x74,0x44,0x54,0xa5,0xb5,0x85,0x95,0xe5,0xf5,0xc5,0xd5, 937 0x36,0x26,0x16,0x06,0x76,0x66,0x56,0x46,0xb7,0xa7,0x97,0x87,0xf7,0xe7,0xd7,0xc7, 938 0x48,0x58,0x68,0x78,0x08,0x18,0x28,0x38,0xc9,0xd9,0xe9,0xf9,0x89,0x99,0xa9,0xb9, 939 0x5a,0x4a,0x7a,0x6a,0x1a,0x0a,0x3a,0x2a,0xdb,0xcb,0xfb,0xeb,0x9b,0x8b,0xbb,0xab, 940 0x6c,0x7c,0x4c,0x5c,0x2c,0x3c,0x0c,0x1c,0xed,0xfd,0xcd,0xdd,0xad,0xbd,0x8d,0x9d, 941 0x7e,0x6e,0x5e,0x4e,0x3e,0x2e,0x1e,0x0e,0xff,0xef,0xdf,0xcf,0xbf,0xaf,0x9f,0x8f, 942 0x91,0x81,0xb1,0xa1,0xd1,0xc1,0xf1,0xe1,0x10,0x00,0x30,0x20,0x50,0x40,0x70,0x60, 943 0x83,0x93,0xa3,0xb3,0xc3,0xd3,0xe3,0xf3,0x02,0x12,0x22,0x32,0x42,0x52,0x62,0x72, 944 0xb5,0xa5,0x95,0x85,0xf5,0xe5,0xd5,0xc5,0x34,0x24,0x14,0x04,0x74,0x64,0x54,0x44, 945 0xa7,0xb7,0x87,0x97,0xe7,0xf7,0xc7,0xd7,0x26,0x36,0x06,0x16,0x66,0x76,0x46,0x56, 946 0xd9,0xc9,0xf9,0xe9,0x99,0x89,0xb9,0xa9,0x58,0x48,0x78,0x68,0x18,0x08,0x38,0x28, 947 0xcb,0xdb,0xeb,0xfb,0x8b,0x9b,0xab,0xbb,0x4a,0x5a,0x6a,0x7a,0x0a,0x1a,0x2a,0x3a, 948 0xfd,0xed,0xdd,0xcd,0xbd,0xad,0x9d,0x8d,0x7c,0x6c,0x5c,0x4c,0x3c,0x2c,0x1c,0x0c, 949 0xef,0xff,0xcf,0xdf,0xaf,0xbf,0x8f,0x9f,0x6e,0x7e,0x4e,0x5e,0x2e,0x3e,0x0e,0x1e 950 }; 951 952 static unsigned char CRCTable2[] = { 953 0x00,0x21,0x42,0x63,0x84,0xa5,0xc6,0xe7,0x08,0x29,0x4a,0x6b,0x8c,0xad,0xce,0xef, 954 0x31,0x10,0x73,0x52,0xb5,0x94,0xf7,0xd6,0x39,0x18,0x7b,0x5a,0xbd,0x9c,0xff,0xde, 955 0x62,0x43,0x20,0x01,0xe6,0xc7,0xa4,0x85,0x6a,0x4b,0x28,0x09,0xee,0xcf,0xac,0x8d, 956 0x53,0x72,0x11,0x30,0xd7,0xf6,0x95,0xb4,0x5b,0x7a,0x19,0x38,0xdf,0xfe,0x9d,0xbc, 957 0xc4,0xe5,0x86,0xa7,0x40,0x61,0x02,0x23,0xcc,0xed,0x8e,0xaf,0x48,0x69,0x0a,0x2b, 958 0xf5,0xd4,0xb7,0x96,0x71,0x50,0x33,0x12,0xfd,0xdc,0xbf,0x9e,0x79,0x58,0x3b,0x1a, 959 0xa6,0x87,0xe4,0xc5,0x22,0x03,0x60,0x41,0xae,0x8f,0xec,0xcd,0x2a,0x0b,0x68,0x49, 960 0x97,0xb6,0xd5,0xf4,0x13,0x32,0x51,0x70,0x9f,0xbe,0xdd,0xfc,0x1b,0x3a,0x59,0x78, 961 0x88,0xa9,0xca,0xeb,0x0c,0x2d,0x4e,0x6f,0x80,0xa1,0xc2,0xe3,0x04,0x25,0x46,0x67, 962 0xb9,0x98,0xfb,0xda,0x3d,0x1c,0x7f,0x5e,0xb1,0x90,0xf3,0xd2,0x35,0x14,0x77,0x56, 963 0xea,0xcb,0xa8,0x89,0x6e,0x4f,0x2c,0x0d,0xe2,0xc3,0xa0,0x81,0x66,0x47,0x24,0x05, 964 0xdb,0xfa,0x99,0xb8,0x5f,0x7e,0x1d,0x3c,0xd3,0xf2,0x91,0xb0,0x57,0x76,0x15,0x34, 965 0x4c,0x6d,0x0e,0x2f,0xc8,0xe9,0x8a,0xab,0x44,0x65,0x06,0x27,0xc0,0xe1,0x82,0xa3, 966 0x7d,0x5c,0x3f,0x1e,0xf9,0xd8,0xbb,0x9a,0x75,0x54,0x37,0x16,0xf1,0xd0,0xb3,0x92, 967 0x2e,0x0f,0x6c,0x4d,0xaa,0x8b,0xe8,0xc9,0x26,0x07,0x64,0x45,0xa2,0x83,0xe0,0xc1, 968 0x1f,0x3e,0x5d,0x7c,0x9b,0xba,0xd9,0xf8,0x17,0x36,0x55,0x74,0x93,0xb2,0xd1,0xf0 969 }; 970 971 /* look at the asm-code - what looks in C a bit strange is almost as good as handmade */ 972 register int i; 973 register unsigned char *CRCT1, *CRCT2, *data, c, crch, crcl; 974 975 CRCT1=CRCTable1; 976 CRCT2=CRCTable2; 977 data=data_a3; 978 crcl=data_d1; 979 crch=data_d0; 980 for (i=data_d3; i>=0; i--) { 981 c = (*data++) ^ crch; 982 crch = CRCT1[c] ^ crcl; 983 crcl = CRCT2[c]; 984 } 985 return (crch<<8)|crcl; 986 } 987 988 static inline ushort dos_hdr_crc (struct dos_header *hdr) 989 { 990 return dos_crc(&(hdr->track), 0xb2, 0x30, 3); /* precomputed magic */ 991 } 992 993 static inline ushort dos_data_crc(unsigned char *data) 994 { 995 return dos_crc(data, 0xe2, 0x95 ,511); /* precomputed magic */ 996 } 997 998 static inline unsigned char dos_decode_byte(ushort word) 999 { 1000 register ushort w2; 1001 register unsigned char byte; 1002 register unsigned char *dec = mfmdecode; 1003 1004 w2=word; 1005 w2>>=8; 1006 w2&=127; 1007 byte = dec[w2]; 1008 byte <<= 4; 1009 w2 = word & 127; 1010 byte |= dec[w2]; 1011 return byte; 1012 } 1013 1014 static unsigned long dos_decode(unsigned char *data, unsigned short *raw, int len) 1015 { 1016 int i; 1017 1018 for (i = 0; i < len; i++) 1019 *data++=dos_decode_byte(*raw++); 1020 return ((ulong)raw); 1021 } 1022 1023 #ifdef DEBUG 1024 static void dbg(unsigned long ptr) 1025 { 1026 printk("raw data @%08lx: %08lx, %08lx ,%08lx, %08lx\n", ptr, 1027 ((ulong *)ptr)[0], ((ulong *)ptr)[1], 1028 ((ulong *)ptr)[2], ((ulong *)ptr)[3]); 1029 } 1030 #endif 1031 1032 static int dos_read(int drive) 1033 { 1034 unsigned long end; 1035 unsigned long raw; 1036 int scnt; 1037 unsigned short crc,data_crc[2]; 1038 struct dos_header hdr; 1039 1040 drive&=3; 1041 raw = (long) raw_buf; 1042 end = raw + unit[drive].type->read_size; 1043 1044 for (scnt=0; scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) { 1045 do { /* search for the right sync of each sec-hdr */ 1046 if (!(raw = scan_sync (raw, end))) { 1047 printk(KERN_INFO "dos_read: no hdr sync on " 1048 "track %d, unit %d for sector %d\n", 1049 unit[drive].track,drive,scnt); 1050 return MFM_NOSYNC; 1051 } 1052 #ifdef DEBUG 1053 dbg(raw); 1054 #endif 1055 } while (*((ushort *)raw)!=0x5554); /* loop usually only once done */ 1056 raw+=2; /* skip over headermark */ 1057 raw = dos_decode((unsigned char *)&hdr,(ushort *) raw,8); 1058 crc = dos_hdr_crc(&hdr); 1059 1060 #ifdef DEBUG 1061 printk("(%3d,%d,%2d,%d) %x\n", hdr.track, hdr.side, 1062 hdr.sec, hdr.len_desc, hdr.crc); 1063 #endif 1064 1065 if (crc != hdr.crc) { 1066 printk(KERN_INFO "dos_read: MFM_HEADER %04x,%04x\n", 1067 hdr.crc, crc); 1068 return MFM_HEADER; 1069 } 1070 if (hdr.track != unit[drive].track/unit[drive].type->heads) { 1071 printk(KERN_INFO "dos_read: MFM_TRACK %d, %d\n", 1072 hdr.track, 1073 unit[drive].track/unit[drive].type->heads); 1074 return MFM_TRACK; 1075 } 1076 1077 if (hdr.side != unit[drive].track%unit[drive].type->heads) { 1078 printk(KERN_INFO "dos_read: MFM_SIDE %d, %d\n", 1079 hdr.side, 1080 unit[drive].track%unit[drive].type->heads); 1081 return MFM_TRACK; 1082 } 1083 1084 if (hdr.len_desc != 2) { 1085 printk(KERN_INFO "dos_read: unknown sector len " 1086 "descriptor %d\n", hdr.len_desc); 1087 return MFM_DATA; 1088 } 1089 #ifdef DEBUG 1090 printk("hdr accepted\n"); 1091 #endif 1092 if (!(raw = scan_sync (raw, end))) { 1093 printk(KERN_INFO "dos_read: no data sync on track " 1094 "%d, unit %d for sector%d, disk sector %d\n", 1095 unit[drive].track, drive, scnt, hdr.sec); 1096 return MFM_NOSYNC; 1097 } 1098 #ifdef DEBUG 1099 dbg(raw); 1100 #endif 1101 1102 if (*((ushort *)raw)!=0x5545) { 1103 printk(KERN_INFO "dos_read: no data mark after " 1104 "sync (%d,%d,%d,%d) sc=%d\n", 1105 hdr.track,hdr.side,hdr.sec,hdr.len_desc,scnt); 1106 return MFM_NOSYNC; 1107 } 1108 1109 raw+=2; /* skip data mark (included in checksum) */ 1110 raw = dos_decode((unsigned char *)(unit[drive].trackbuf + (hdr.sec - 1) * 512), (ushort *) raw, 512); 1111 raw = dos_decode((unsigned char *)data_crc,(ushort *) raw,4); 1112 crc = dos_data_crc(unit[drive].trackbuf + (hdr.sec - 1) * 512); 1113 1114 if (crc != data_crc[0]) { 1115 printk(KERN_INFO "dos_read: MFM_DATA (%d,%d,%d,%d) " 1116 "sc=%d, %x %x\n", hdr.track, hdr.side, 1117 hdr.sec, hdr.len_desc, scnt,data_crc[0], crc); 1118 printk(KERN_INFO "data=(%lx,%lx,%lx,%lx,...)\n", 1119 ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[0], 1120 ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[1], 1121 ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[2], 1122 ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[3]); 1123 return MFM_DATA; 1124 } 1125 } 1126 return 0; 1127 } 1128 1129 static inline ushort dos_encode_byte(unsigned char byte) 1130 { 1131 register unsigned char *enc, b2, b1; 1132 register ushort word; 1133 1134 enc=mfmencode; 1135 b1=byte; 1136 b2=b1>>4; 1137 b1&=15; 1138 word=enc[b2] <<8 | enc [b1]; 1139 return (word|((word&(256|64)) ? 0: 128)); 1140 } 1141 1142 static void dos_encode_block(ushort *dest, unsigned char *src, int len) 1143 { 1144 int i; 1145 1146 for (i = 0; i < len; i++) { 1147 *dest=dos_encode_byte(*src++); 1148 *dest|=((dest[-1]&1)||(*dest&0x4000))? 0: 0x8000; 1149 dest++; 1150 } 1151 } 1152 1153 static unsigned long *ms_putsec(int drive, unsigned long *raw, int cnt) 1154 { 1155 static struct dos_header hdr={0,0,0,2,0, 1156 {78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78}}; 1157 int i; 1158 static ushort crc[2]={0,0x4e4e}; 1159 1160 drive&=3; 1161 /* id gap 1 */ 1162 /* the MFM word before is always 9254 */ 1163 for(i=0;i<6;i++) 1164 *raw++=0xaaaaaaaa; 1165 /* 3 sync + 1 headermark */ 1166 *raw++=0x44894489; 1167 *raw++=0x44895554; 1168 1169 /* fill in the variable parts of the header */ 1170 hdr.track=unit[drive].track/unit[drive].type->heads; 1171 hdr.side=unit[drive].track%unit[drive].type->heads; 1172 hdr.sec=cnt+1; 1173 hdr.crc=dos_hdr_crc(&hdr); 1174 1175 /* header (without "magic") and id gap 2*/ 1176 dos_encode_block((ushort *)raw,(unsigned char *) &hdr.track,28); 1177 raw+=14; 1178 1179 /*id gap 3 */ 1180 for(i=0;i<6;i++) 1181 *raw++=0xaaaaaaaa; 1182 1183 /* 3 syncs and 1 datamark */ 1184 *raw++=0x44894489; 1185 *raw++=0x44895545; 1186 1187 /* data */ 1188 dos_encode_block((ushort *)raw, 1189 (unsigned char *)unit[drive].trackbuf+cnt*512,512); 1190 raw+=256; 1191 1192 /*data crc + jd's special gap (long words :-/) */ 1193 crc[0]=dos_data_crc(unit[drive].trackbuf+cnt*512); 1194 dos_encode_block((ushort *) raw,(unsigned char *)crc,4); 1195 raw+=2; 1196 1197 /* data gap */ 1198 for(i=0;i<38;i++) 1199 *raw++=0x92549254; 1200 1201 return raw; /* wrote 652 MFM words */ 1202 } 1203 1204 static void dos_write(int disk) 1205 { 1206 int cnt; 1207 unsigned long raw = (unsigned long) raw_buf; 1208 unsigned long *ptr=(unsigned long *)raw; 1209 1210 disk&=3; 1211 /* really gap4 + indexgap , but we write it first and round it up */ 1212 for (cnt=0;cnt<425;cnt++) 1213 *ptr++=0x92549254; 1214 1215 /* the following is just guessed */ 1216 if (unit[disk].type->sect_mult==2) /* check for HD-Disks */ 1217 for(cnt=0;cnt<473;cnt++) 1218 *ptr++=0x92549254; 1219 1220 /* now the index marks...*/ 1221 for (cnt=0;cnt<20;cnt++) 1222 *ptr++=0x92549254; 1223 for (cnt=0;cnt<6;cnt++) 1224 *ptr++=0xaaaaaaaa; 1225 *ptr++=0x52245224; 1226 *ptr++=0x52245552; 1227 for (cnt=0;cnt<20;cnt++) 1228 *ptr++=0x92549254; 1229 1230 /* sectors */ 1231 for(cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++) 1232 ptr=ms_putsec(disk,ptr,cnt); 1233 1234 *(ushort *)ptr = 0xaaa8; /* MFM word before is always 0x9254 */ 1235 } 1236 1237 /* 1238 * Here comes the high level stuff (i.e. the filesystem interface) 1239 * and helper functions. 1240 * Normally this should be the only part that has to be adapted to 1241 * different kernel versions. 1242 */ 1243 1244 /* FIXME: this assumes the drive is still spinning - 1245 * which is only true if we complete writing a track within three seconds 1246 */ 1247 static void flush_track_callback(unsigned long nr) 1248 { 1249 nr&=3; 1250 writefromint = 1; 1251 if (!try_fdc(nr)) { 1252 /* we might block in an interrupt, so try again later */ 1253 flush_track_timer[nr].expires = jiffies + 1; 1254 add_timer(flush_track_timer + nr); 1255 return; 1256 } 1257 get_fdc(nr); 1258 (*unit[nr].dtype->write_fkt)(nr); 1259 if (!raw_write(nr)) { 1260 printk (KERN_NOTICE "floppy disk write protected\n"); 1261 writefromint = 0; 1262 writepending = 0; 1263 } 1264 rel_fdc(); 1265 } 1266 1267 static int non_int_flush_track (unsigned long nr) 1268 { 1269 unsigned long flags; 1270 1271 nr&=3; 1272 writefromint = 0; 1273 del_timer(&post_write_timer); 1274 get_fdc(nr); 1275 if (!fd_motor_on(nr)) { 1276 writepending = 0; 1277 rel_fdc(); 1278 return 0; 1279 } 1280 local_irq_save(flags); 1281 if (writepending != 2) { 1282 local_irq_restore(flags); 1283 (*unit[nr].dtype->write_fkt)(nr); 1284 if (!raw_write(nr)) { 1285 printk (KERN_NOTICE "floppy disk write protected " 1286 "in write!\n"); 1287 writepending = 0; 1288 return 0; 1289 } 1290 wait_event(wait_fd_block, block_flag != 2); 1291 } 1292 else { 1293 local_irq_restore(flags); 1294 ms_delay(2); /* 2 ms post_write delay */ 1295 post_write(nr); 1296 } 1297 rel_fdc(); 1298 return 1; 1299 } 1300 1301 static int get_track(int drive, int track) 1302 { 1303 int error, errcnt; 1304 1305 drive&=3; 1306 if (unit[drive].track == track) 1307 return 0; 1308 get_fdc(drive); 1309 if (!fd_motor_on(drive)) { 1310 rel_fdc(); 1311 return -1; 1312 } 1313 1314 if (unit[drive].dirty == 1) { 1315 del_timer (flush_track_timer + drive); 1316 non_int_flush_track (drive); 1317 } 1318 errcnt = 0; 1319 while (errcnt < MAX_ERRORS) { 1320 if (!fd_seek(drive, track)) 1321 return -1; 1322 raw_read(drive); 1323 error = (*unit[drive].dtype->read_fkt)(drive); 1324 if (error == 0) { 1325 rel_fdc(); 1326 return 0; 1327 } 1328 /* Read Error Handling: recalibrate and try again */ 1329 unit[drive].track = -1; 1330 errcnt++; 1331 } 1332 rel_fdc(); 1333 return -1; 1334 } 1335 1336 /* 1337 * Round-robin between our available drives, doing one request from each 1338 */ 1339 static struct request *set_next_request(void) 1340 { 1341 struct request_queue *q; 1342 int cnt = FD_MAX_UNITS; 1343 struct request *rq = NULL; 1344 1345 /* Find next queue we can dispatch from */ 1346 fdc_queue = fdc_queue + 1; 1347 if (fdc_queue == FD_MAX_UNITS) 1348 fdc_queue = 0; 1349 1350 for(cnt = FD_MAX_UNITS; cnt > 0; cnt--) { 1351 1352 if (unit[fdc_queue].type->code == FD_NODRIVE) { 1353 if (++fdc_queue == FD_MAX_UNITS) 1354 fdc_queue = 0; 1355 continue; 1356 } 1357 1358 q = unit[fdc_queue].gendisk->queue; 1359 if (q) { 1360 rq = blk_fetch_request(q); 1361 if (rq) 1362 break; 1363 } 1364 1365 if (++fdc_queue == FD_MAX_UNITS) 1366 fdc_queue = 0; 1367 } 1368 1369 return rq; 1370 } 1371 1372 static void redo_fd_request(void) 1373 { 1374 struct request *rq; 1375 unsigned int cnt, block, track, sector; 1376 int drive; 1377 struct amiga_floppy_struct *floppy; 1378 char *data; 1379 unsigned long flags; 1380 blk_status_t err; 1381 1382 next_req: 1383 rq = set_next_request(); 1384 if (!rq) { 1385 /* Nothing left to do */ 1386 return; 1387 } 1388 1389 floppy = rq->rq_disk->private_data; 1390 drive = floppy - unit; 1391 1392 next_segment: 1393 /* Here someone could investigate to be more efficient */ 1394 for (cnt = 0, err = BLK_STS_OK; cnt < blk_rq_cur_sectors(rq); cnt++) { 1395 #ifdef DEBUG 1396 printk("fd: sector %ld + %d requested for %s\n", 1397 blk_rq_pos(rq), cnt, 1398 (rq_data_dir(rq) == READ) ? "read" : "write"); 1399 #endif 1400 block = blk_rq_pos(rq) + cnt; 1401 if ((int)block > floppy->blocks) { 1402 err = BLK_STS_IOERR; 1403 break; 1404 } 1405 1406 track = block / (floppy->dtype->sects * floppy->type->sect_mult); 1407 sector = block % (floppy->dtype->sects * floppy->type->sect_mult); 1408 data = bio_data(rq->bio) + 512 * cnt; 1409 #ifdef DEBUG 1410 printk("access to track %d, sector %d, with buffer at " 1411 "0x%08lx\n", track, sector, data); 1412 #endif 1413 1414 if (get_track(drive, track) == -1) { 1415 err = BLK_STS_IOERR; 1416 break; 1417 } 1418 1419 if (rq_data_dir(rq) == READ) { 1420 memcpy(data, floppy->trackbuf + sector * 512, 512); 1421 } else { 1422 memcpy(floppy->trackbuf + sector * 512, data, 512); 1423 1424 /* keep the drive spinning while writes are scheduled */ 1425 if (!fd_motor_on(drive)) { 1426 err = BLK_STS_IOERR; 1427 break; 1428 } 1429 /* 1430 * setup a callback to write the track buffer 1431 * after a short (1 tick) delay. 1432 */ 1433 local_irq_save(flags); 1434 1435 floppy->dirty = 1; 1436 /* reset the timer */ 1437 mod_timer (flush_track_timer + drive, jiffies + 1); 1438 local_irq_restore(flags); 1439 } 1440 } 1441 1442 if (__blk_end_request_cur(rq, err)) 1443 goto next_segment; 1444 goto next_req; 1445 } 1446 1447 static void do_fd_request(struct request_queue * q) 1448 { 1449 redo_fd_request(); 1450 } 1451 1452 static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 1453 { 1454 int drive = MINOR(bdev->bd_dev) & 3; 1455 1456 geo->heads = unit[drive].type->heads; 1457 geo->sectors = unit[drive].dtype->sects * unit[drive].type->sect_mult; 1458 geo->cylinders = unit[drive].type->tracks; 1459 return 0; 1460 } 1461 1462 static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, 1463 unsigned int cmd, unsigned long param) 1464 { 1465 struct amiga_floppy_struct *p = bdev->bd_disk->private_data; 1466 int drive = p - unit; 1467 static struct floppy_struct getprm; 1468 void __user *argp = (void __user *)param; 1469 1470 switch(cmd){ 1471 case FDFMTBEG: 1472 get_fdc(drive); 1473 if (fd_ref[drive] > 1) { 1474 rel_fdc(); 1475 return -EBUSY; 1476 } 1477 fsync_bdev(bdev); 1478 if (fd_motor_on(drive) == 0) { 1479 rel_fdc(); 1480 return -ENODEV; 1481 } 1482 if (fd_calibrate(drive) == 0) { 1483 rel_fdc(); 1484 return -ENXIO; 1485 } 1486 floppy_off(drive); 1487 rel_fdc(); 1488 break; 1489 case FDFMTTRK: 1490 if (param < p->type->tracks * p->type->heads) 1491 { 1492 get_fdc(drive); 1493 if (fd_seek(drive,param) != 0){ 1494 memset(p->trackbuf, FD_FILL_BYTE, 1495 p->dtype->sects * p->type->sect_mult * 512); 1496 non_int_flush_track(drive); 1497 } 1498 floppy_off(drive); 1499 rel_fdc(); 1500 } 1501 else 1502 return -EINVAL; 1503 break; 1504 case FDFMTEND: 1505 floppy_off(drive); 1506 invalidate_bdev(bdev); 1507 break; 1508 case FDGETPRM: 1509 memset((void *)&getprm, 0, sizeof (getprm)); 1510 getprm.track=p->type->tracks; 1511 getprm.head=p->type->heads; 1512 getprm.sect=p->dtype->sects * p->type->sect_mult; 1513 getprm.size=p->blocks; 1514 if (copy_to_user(argp, &getprm, sizeof(struct floppy_struct))) 1515 return -EFAULT; 1516 break; 1517 case FDSETPRM: 1518 case FDDEFPRM: 1519 return -EINVAL; 1520 case FDFLUSH: /* unconditionally, even if not needed */ 1521 del_timer (flush_track_timer + drive); 1522 non_int_flush_track(drive); 1523 break; 1524 #ifdef RAW_IOCTL 1525 case IOCTL_RAW_TRACK: 1526 if (copy_to_user(argp, raw_buf, p->type->read_size)) 1527 return -EFAULT; 1528 else 1529 return p->type->read_size; 1530 #endif 1531 default: 1532 printk(KERN_DEBUG "fd_ioctl: unknown cmd %d for drive %d.", 1533 cmd, drive); 1534 return -ENOSYS; 1535 } 1536 return 0; 1537 } 1538 1539 static int fd_ioctl(struct block_device *bdev, fmode_t mode, 1540 unsigned int cmd, unsigned long param) 1541 { 1542 int ret; 1543 1544 mutex_lock(&amiflop_mutex); 1545 ret = fd_locked_ioctl(bdev, mode, cmd, param); 1546 mutex_unlock(&amiflop_mutex); 1547 1548 return ret; 1549 } 1550 1551 static void fd_probe(int dev) 1552 { 1553 unsigned long code; 1554 int type; 1555 int drive; 1556 1557 drive = dev & 3; 1558 code = fd_get_drive_id(drive); 1559 1560 /* get drive type */ 1561 for (type = 0; type < num_dr_types; type++) 1562 if (drive_types[type].code == code) 1563 break; 1564 1565 if (type >= num_dr_types) { 1566 printk(KERN_WARNING "fd_probe: unsupported drive type " 1567 "%08lx found\n", code); 1568 unit[drive].type = &drive_types[num_dr_types-1]; /* FD_NODRIVE */ 1569 return; 1570 } 1571 1572 unit[drive].type = drive_types + type; 1573 unit[drive].track = -1; 1574 1575 unit[drive].disk = -1; 1576 unit[drive].motor = 0; 1577 unit[drive].busy = 0; 1578 unit[drive].status = -1; 1579 } 1580 1581 /* 1582 * floppy_open check for aliasing (/dev/fd0 can be the same as 1583 * /dev/PS0 etc), and disallows simultaneous access to the same 1584 * drive with different device numbers. 1585 */ 1586 static int floppy_open(struct block_device *bdev, fmode_t mode) 1587 { 1588 int drive = MINOR(bdev->bd_dev) & 3; 1589 int system = (MINOR(bdev->bd_dev) & 4) >> 2; 1590 int old_dev; 1591 unsigned long flags; 1592 1593 mutex_lock(&amiflop_mutex); 1594 old_dev = fd_device[drive]; 1595 1596 if (fd_ref[drive] && old_dev != system) { 1597 mutex_unlock(&amiflop_mutex); 1598 return -EBUSY; 1599 } 1600 1601 if (mode & (FMODE_READ|FMODE_WRITE)) { 1602 check_disk_change(bdev); 1603 if (mode & FMODE_WRITE) { 1604 int wrprot; 1605 1606 get_fdc(drive); 1607 fd_select (drive); 1608 wrprot = !(ciaa.pra & DSKPROT); 1609 fd_deselect (drive); 1610 rel_fdc(); 1611 1612 if (wrprot) { 1613 mutex_unlock(&amiflop_mutex); 1614 return -EROFS; 1615 } 1616 } 1617 } 1618 1619 local_irq_save(flags); 1620 fd_ref[drive]++; 1621 fd_device[drive] = system; 1622 local_irq_restore(flags); 1623 1624 unit[drive].dtype=&data_types[system]; 1625 unit[drive].blocks=unit[drive].type->heads*unit[drive].type->tracks* 1626 data_types[system].sects*unit[drive].type->sect_mult; 1627 set_capacity(unit[drive].gendisk, unit[drive].blocks); 1628 1629 printk(KERN_INFO "fd%d: accessing %s-disk with %s-layout\n",drive, 1630 unit[drive].type->name, data_types[system].name); 1631 1632 mutex_unlock(&amiflop_mutex); 1633 return 0; 1634 } 1635 1636 static void floppy_release(struct gendisk *disk, fmode_t mode) 1637 { 1638 struct amiga_floppy_struct *p = disk->private_data; 1639 int drive = p - unit; 1640 1641 mutex_lock(&amiflop_mutex); 1642 if (unit[drive].dirty == 1) { 1643 del_timer (flush_track_timer + drive); 1644 non_int_flush_track (drive); 1645 } 1646 1647 if (!fd_ref[drive]--) { 1648 printk(KERN_CRIT "floppy_release with fd_ref == 0"); 1649 fd_ref[drive] = 0; 1650 } 1651 #ifdef MODULE 1652 /* the mod_use counter is handled this way */ 1653 floppy_off (drive | 0x40000000); 1654 #endif 1655 mutex_unlock(&amiflop_mutex); 1656 } 1657 1658 /* 1659 * check_events is never called from an interrupt, so we can relax a bit 1660 * here, sleep etc. Note that floppy-on tries to set current_DOR to point 1661 * to the desired drive, but it will probably not survive the sleep if 1662 * several floppies are used at the same time: thus the loop. 1663 */ 1664 static unsigned amiga_check_events(struct gendisk *disk, unsigned int clearing) 1665 { 1666 struct amiga_floppy_struct *p = disk->private_data; 1667 int drive = p - unit; 1668 int changed; 1669 static int first_time = 1; 1670 1671 if (first_time) 1672 changed = first_time--; 1673 else { 1674 get_fdc(drive); 1675 fd_select (drive); 1676 changed = !(ciaa.pra & DSKCHANGE); 1677 fd_deselect (drive); 1678 rel_fdc(); 1679 } 1680 1681 if (changed) { 1682 fd_probe(drive); 1683 p->track = -1; 1684 p->dirty = 0; 1685 writepending = 0; /* if this was true before, too bad! */ 1686 writefromint = 0; 1687 return DISK_EVENT_MEDIA_CHANGE; 1688 } 1689 return 0; 1690 } 1691 1692 static const struct block_device_operations floppy_fops = { 1693 .owner = THIS_MODULE, 1694 .open = floppy_open, 1695 .release = floppy_release, 1696 .ioctl = fd_ioctl, 1697 .getgeo = fd_getgeo, 1698 .check_events = amiga_check_events, 1699 }; 1700 1701 static int __init fd_probe_drives(void) 1702 { 1703 int drive,drives,nomem; 1704 1705 printk(KERN_INFO "FD: probing units\nfound "); 1706 drives=0; 1707 nomem=0; 1708 for(drive=0;drive<FD_MAX_UNITS;drive++) { 1709 struct gendisk *disk; 1710 fd_probe(drive); 1711 if (unit[drive].type->code == FD_NODRIVE) 1712 continue; 1713 disk = alloc_disk(1); 1714 if (!disk) { 1715 unit[drive].type->code = FD_NODRIVE; 1716 continue; 1717 } 1718 unit[drive].gendisk = disk; 1719 1720 disk->queue = blk_init_queue(do_fd_request, &amiflop_lock); 1721 if (!disk->queue) { 1722 unit[drive].type->code = FD_NODRIVE; 1723 continue; 1724 } 1725 1726 drives++; 1727 if ((unit[drive].trackbuf = kmalloc(FLOPPY_MAX_SECTORS * 512, GFP_KERNEL)) == NULL) { 1728 printk("no mem for "); 1729 unit[drive].type = &drive_types[num_dr_types - 1]; /* FD_NODRIVE */ 1730 drives--; 1731 nomem = 1; 1732 } 1733 printk("fd%d ",drive); 1734 disk->major = FLOPPY_MAJOR; 1735 disk->first_minor = drive; 1736 disk->fops = &floppy_fops; 1737 sprintf(disk->disk_name, "fd%d", drive); 1738 disk->private_data = &unit[drive]; 1739 set_capacity(disk, 880*2); 1740 add_disk(disk); 1741 } 1742 if ((drives > 0) || (nomem == 0)) { 1743 if (drives == 0) 1744 printk("no drives"); 1745 printk("\n"); 1746 return drives; 1747 } 1748 printk("\n"); 1749 return -ENOMEM; 1750 } 1751 1752 static struct kobject *floppy_find(dev_t dev, int *part, void *data) 1753 { 1754 int drive = *part & 3; 1755 if (unit[drive].type->code == FD_NODRIVE) 1756 return NULL; 1757 *part = 0; 1758 return get_disk(unit[drive].gendisk); 1759 } 1760 1761 static int __init amiga_floppy_probe(struct platform_device *pdev) 1762 { 1763 int i, ret; 1764 1765 if (register_blkdev(FLOPPY_MAJOR,"fd")) 1766 return -EBUSY; 1767 1768 ret = -ENOMEM; 1769 raw_buf = amiga_chip_alloc(RAW_BUF_SIZE, "Floppy"); 1770 if (!raw_buf) { 1771 printk("fd: cannot get chip mem buffer\n"); 1772 goto out_blkdev; 1773 } 1774 1775 ret = -EBUSY; 1776 if (request_irq(IRQ_AMIGA_DSKBLK, fd_block_done, 0, "floppy_dma", NULL)) { 1777 printk("fd: cannot get irq for dma\n"); 1778 goto out_irq; 1779 } 1780 1781 if (request_irq(IRQ_AMIGA_CIAA_TB, ms_isr, 0, "floppy_timer", NULL)) { 1782 printk("fd: cannot get irq for timer\n"); 1783 goto out_irq2; 1784 } 1785 1786 ret = -ENODEV; 1787 if (fd_probe_drives() < 1) /* No usable drives */ 1788 goto out_probe; 1789 1790 blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE, 1791 floppy_find, NULL, NULL); 1792 1793 /* initialize variables */ 1794 init_timer(&motor_on_timer); 1795 motor_on_timer.expires = 0; 1796 motor_on_timer.data = 0; 1797 motor_on_timer.function = motor_on_callback; 1798 for (i = 0; i < FD_MAX_UNITS; i++) { 1799 init_timer(&motor_off_timer[i]); 1800 motor_off_timer[i].expires = 0; 1801 motor_off_timer[i].data = i|0x80000000; 1802 motor_off_timer[i].function = fd_motor_off; 1803 init_timer(&flush_track_timer[i]); 1804 flush_track_timer[i].expires = 0; 1805 flush_track_timer[i].data = i; 1806 flush_track_timer[i].function = flush_track_callback; 1807 1808 unit[i].track = -1; 1809 } 1810 1811 init_timer(&post_write_timer); 1812 post_write_timer.expires = 0; 1813 post_write_timer.data = 0; 1814 post_write_timer.function = post_write; 1815 1816 for (i = 0; i < 128; i++) 1817 mfmdecode[i]=255; 1818 for (i = 0; i < 16; i++) 1819 mfmdecode[mfmencode[i]]=i; 1820 1821 /* make sure that disk DMA is enabled */ 1822 custom.dmacon = DMAF_SETCLR | DMAF_DISK; 1823 1824 /* init ms timer */ 1825 ciaa.crb = 8; /* one-shot, stop */ 1826 return 0; 1827 1828 out_probe: 1829 free_irq(IRQ_AMIGA_CIAA_TB, NULL); 1830 out_irq2: 1831 free_irq(IRQ_AMIGA_DSKBLK, NULL); 1832 out_irq: 1833 amiga_chip_free(raw_buf); 1834 out_blkdev: 1835 unregister_blkdev(FLOPPY_MAJOR,"fd"); 1836 return ret; 1837 } 1838 1839 #if 0 /* not safe to unload */ 1840 static int __exit amiga_floppy_remove(struct platform_device *pdev) 1841 { 1842 int i; 1843 1844 for( i = 0; i < FD_MAX_UNITS; i++) { 1845 if (unit[i].type->code != FD_NODRIVE) { 1846 struct request_queue *q = unit[i].gendisk->queue; 1847 del_gendisk(unit[i].gendisk); 1848 put_disk(unit[i].gendisk); 1849 kfree(unit[i].trackbuf); 1850 if (q) 1851 blk_cleanup_queue(q); 1852 } 1853 } 1854 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256); 1855 free_irq(IRQ_AMIGA_CIAA_TB, NULL); 1856 free_irq(IRQ_AMIGA_DSKBLK, NULL); 1857 custom.dmacon = DMAF_DISK; /* disable DMA */ 1858 amiga_chip_free(raw_buf); 1859 unregister_blkdev(FLOPPY_MAJOR, "fd"); 1860 } 1861 #endif 1862 1863 static struct platform_driver amiga_floppy_driver = { 1864 .driver = { 1865 .name = "amiga-floppy", 1866 }, 1867 }; 1868 1869 static int __init amiga_floppy_init(void) 1870 { 1871 return platform_driver_probe(&amiga_floppy_driver, amiga_floppy_probe); 1872 } 1873 1874 module_init(amiga_floppy_init); 1875 1876 #ifndef MODULE 1877 static int __init amiga_floppy_setup (char *str) 1878 { 1879 int n; 1880 if (!MACH_IS_AMIGA) 1881 return 0; 1882 if (!get_option(&str, &n)) 1883 return 0; 1884 printk (KERN_INFO "amiflop: Setting default df0 to %x\n", n); 1885 fd_def_df0 = n; 1886 return 1; 1887 } 1888 1889 __setup("floppy=", amiga_floppy_setup); 1890 #endif 1891 1892 MODULE_ALIAS("platform:amiga-floppy"); 1893