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