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