1 /* 2 * linux/amiga/amiflop.c 3 * 4 * Copyright (C) 1993 Greg Harp 5 * Portions of this driver are based on code contributed by Brad Pepers 6 * 7 * revised 28.5.95 by Joerg Dorchain 8 * - now no bugs(?) any more for both HD & DD 9 * - added support for 40 Track 5.25" drives, 80-track hopefully behaves 10 * like 3.5" dd (no way to test - are there any 5.25" drives out there 11 * that work on an A4000?) 12 * - wrote formatting routine (maybe dirty, but works) 13 * 14 * june/july 1995 added ms-dos support by Joerg Dorchain 15 * (portions based on messydos.device and various contributors) 16 * - currently only 9 and 18 sector disks 17 * 18 * - fixed a bug with the internal trackbuffer when using multiple 19 * disks the same time 20 * - made formatting a bit safer 21 * - added command line and machine based default for "silent" df0 22 * 23 * december 1995 adapted for 1.2.13pl4 by Joerg Dorchain 24 * - works but I think it's inefficient. (look in redo_fd_request) 25 * But the changes were very efficient. (only three and a half lines) 26 * 27 * january 1996 added special ioctl for tracking down read/write problems 28 * - usage ioctl(d, RAW_TRACK, ptr); the raw track buffer (MFM-encoded data 29 * is copied to area. (area should be large enough since no checking is 30 * done - 30K is currently sufficient). return the actual size of the 31 * trackbuffer 32 * - replaced udelays() by a timer (CIAA timer B) for the waits 33 * needed for the disk mechanic. 34 * 35 * february 1996 fixed error recovery and multiple disk access 36 * - both got broken the first time I tampered with the driver :-( 37 * - still not safe, but better than before 38 * 39 * revised Marts 3rd, 1996 by Jes Sorensen for use in the 1.3.28 kernel. 40 * - Minor changes to accept the kdev_t. 41 * - Replaced some more udelays with ms_delays. Udelay is just a loop, 42 * and so the delay will be different depending on the given 43 * processor :-( 44 * - The driver could use a major cleanup because of the new 45 * major/minor handling that came with kdev_t. It seems to work for 46 * the time being, but I can't guarantee that it will stay like 47 * that when we start using 16 (24?) bit minors. 48 * 49 * restructured jan 1997 by Joerg Dorchain 50 * - Fixed Bug accessing multiple disks 51 * - some code cleanup 52 * - added trackbuffer for each drive to speed things up 53 * - fixed some race conditions (who finds the next may send it to me ;-) 54 */ 55 56 #include <linux/module.h> 57 #include <linux/slab.h> 58 59 #include <linux/fd.h> 60 #include <linux/hdreg.h> 61 #include <linux/delay.h> 62 #include <linux/init.h> 63 #include <linux/mutex.h> 64 #include <linux/amifdreg.h> 65 #include <linux/amifd.h> 66 #include <linux/fs.h> 67 #include <linux/blkdev.h> 68 #include <linux/elevator.h> 69 #include <linux/interrupt.h> 70 #include <linux/platform_device.h> 71 72 #include <asm/setup.h> 73 #include <linux/uaccess.h> 74 #include <asm/amigahw.h> 75 #include <asm/amigaints.h> 76 #include <asm/irq.h> 77 78 #undef DEBUG /* print _LOTS_ of infos */ 79 80 #define RAW_IOCTL 81 #ifdef RAW_IOCTL 82 #define IOCTL_RAW_TRACK 0x5254524B /* 'RTRK' */ 83 #endif 84 85 /* 86 * Defines 87 */ 88 89 /* 90 * Error codes 91 */ 92 #define FD_OK 0 /* operation succeeded */ 93 #define FD_ERROR -1 /* general error (seek, read, write, etc) */ 94 #define FD_NOUNIT 1 /* unit does not exist */ 95 #define FD_UNITBUSY 2 /* unit already active */ 96 #define FD_NOTACTIVE 3 /* unit is not active */ 97 #define FD_NOTREADY 4 /* unit is not ready (motor not on/no disk) */ 98 99 #define MFM_NOSYNC 1 100 #define MFM_HEADER 2 101 #define MFM_DATA 3 102 #define MFM_TRACK 4 103 104 /* 105 * Floppy ID values 106 */ 107 #define FD_NODRIVE 0x00000000 /* response when no unit is present */ 108 #define FD_DD_3 0xffffffff /* double-density 3.5" (880K) drive */ 109 #define FD_HD_3 0x55555555 /* high-density 3.5" (1760K) drive */ 110 #define FD_DD_5 0xaaaaaaaa /* double-density 5.25" (440K) drive */ 111 112 static DEFINE_MUTEX(amiflop_mutex); 113 static unsigned long int fd_def_df0 = FD_DD_3; /* default for df0 if it doesn't identify */ 114 115 module_param(fd_def_df0, ulong, 0); 116 MODULE_LICENSE("GPL"); 117 118 /* 119 * Macros 120 */ 121 #define MOTOR_ON (ciab.prb &= ~DSKMOTOR) 122 #define MOTOR_OFF (ciab.prb |= DSKMOTOR) 123 #define SELECT(mask) (ciab.prb &= ~mask) 124 #define DESELECT(mask) (ciab.prb |= mask) 125 #define SELMASK(drive) (1 << (3 + (drive & 3))) 126 127 static struct fd_drive_type drive_types[] = { 128 /* code name tr he rdsz wrsz sm pc1 pc2 sd st st*/ 129 /* warning: times are now in milliseconds (ms) */ 130 { FD_DD_3, "DD 3.5", 80, 2, 14716, 13630, 1, 80,161, 3, 18, 1}, 131 { FD_HD_3, "HD 3.5", 80, 2, 28344, 27258, 2, 80,161, 3, 18, 1}, 132 { FD_DD_5, "DD 5.25", 40, 2, 14716, 13630, 1, 40, 81, 6, 30, 2}, 133 { FD_NODRIVE, "No Drive", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} 134 }; 135 static int num_dr_types = ARRAY_SIZE(drive_types); 136 137 static int amiga_read(int), dos_read(int); 138 static void amiga_write(int), dos_write(int); 139 static struct fd_data_type data_types[] = { 140 { "Amiga", 11 , amiga_read, amiga_write}, 141 { "MS-Dos", 9, dos_read, dos_write} 142 }; 143 144 /* current info on each unit */ 145 static struct amiga_floppy_struct unit[FD_MAX_UNITS]; 146 147 static struct timer_list flush_track_timer[FD_MAX_UNITS]; 148 static struct timer_list post_write_timer; 149 static struct timer_list motor_on_timer; 150 static struct timer_list motor_off_timer[FD_MAX_UNITS]; 151 static int on_attempts; 152 153 /* Synchronization of FDC access */ 154 /* request loop (trackbuffer) */ 155 static volatile int fdc_busy = -1; 156 static volatile int fdc_nested; 157 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait); 158 159 static DECLARE_COMPLETION(motor_on_completion); 160 161 static volatile int selected = -1; /* currently selected drive */ 162 163 static int writepending; 164 static int writefromint; 165 static char *raw_buf; 166 static int fdc_queue; 167 168 static DEFINE_SPINLOCK(amiflop_lock); 169 170 #define RAW_BUF_SIZE 30000 /* size of raw disk data */ 171 172 /* 173 * These are global variables, as that's the easiest way to give 174 * information to interrupts. They are the data used for the current 175 * request. 176 */ 177 static volatile char block_flag; 178 static DECLARE_WAIT_QUEUE_HEAD(wait_fd_block); 179 180 /* MS-Dos MFM Coding tables (should go quick and easy) */ 181 static unsigned char mfmencode[16]={ 182 0x2a, 0x29, 0x24, 0x25, 0x12, 0x11, 0x14, 0x15, 183 0x4a, 0x49, 0x44, 0x45, 0x52, 0x51, 0x54, 0x55 184 }; 185 static unsigned char mfmdecode[128]; 186 187 /* floppy internal millisecond timer stuff */ 188 static DECLARE_COMPLETION(ms_wait_completion); 189 #define MS_TICKS ((amiga_eclock+50)/1000) 190 191 /* 192 * Note that MAX_ERRORS=X doesn't imply that we retry every bad read 193 * max X times - some types of errors increase the errorcount by 2 or 194 * even 3, so we might actually retry only X/2 times before giving up. 195 */ 196 #define MAX_ERRORS 12 197 198 #define custom amiga_custom 199 200 /* Prevent "aliased" accesses. */ 201 static int fd_ref[4] = { 0,0,0,0 }; 202 static int fd_device[4] = { 0, 0, 0, 0 }; 203 204 /* 205 * Here come the actual hardware access and helper functions. 206 * They are not reentrant and single threaded because all drives 207 * share the same hardware and the same trackbuffer. 208 */ 209 210 /* Milliseconds timer */ 211 212 static irqreturn_t ms_isr(int irq, void *dummy) 213 { 214 complete(&ms_wait_completion); 215 return IRQ_HANDLED; 216 } 217 218 /* all waits are queued up 219 A more generic routine would do a schedule a la timer.device */ 220 static void ms_delay(int ms) 221 { 222 int ticks; 223 static DEFINE_MUTEX(mutex); 224 225 if (ms > 0) { 226 mutex_lock(&mutex); 227 ticks = MS_TICKS*ms-1; 228 ciaa.tblo=ticks%256; 229 ciaa.tbhi=ticks/256; 230 ciaa.crb=0x19; /*count eclock, force load, one-shoot, start */ 231 wait_for_completion(&ms_wait_completion); 232 mutex_unlock(&mutex); 233 } 234 } 235 236 /* Hardware semaphore */ 237 238 /* returns true when we would get the semaphore */ 239 static inline int try_fdc(int drive) 240 { 241 drive &= 3; 242 return ((fdc_busy < 0) || (fdc_busy == drive)); 243 } 244 245 static void get_fdc(int drive) 246 { 247 unsigned long flags; 248 249 drive &= 3; 250 #ifdef DEBUG 251 printk("get_fdc: drive %d fdc_busy %d fdc_nested %d\n",drive,fdc_busy,fdc_nested); 252 #endif 253 local_irq_save(flags); 254 wait_event(fdc_wait, try_fdc(drive)); 255 fdc_busy = drive; 256 fdc_nested++; 257 local_irq_restore(flags); 258 } 259 260 static inline void rel_fdc(void) 261 { 262 #ifdef DEBUG 263 if (fdc_nested == 0) 264 printk("fd: unmatched rel_fdc\n"); 265 printk("rel_fdc: fdc_busy %d fdc_nested %d\n",fdc_busy,fdc_nested); 266 #endif 267 fdc_nested--; 268 if (fdc_nested == 0) { 269 fdc_busy = -1; 270 wake_up(&fdc_wait); 271 } 272 } 273 274 static void fd_select (int drive) 275 { 276 unsigned char prb = ~0; 277 278 drive&=3; 279 #ifdef DEBUG 280 printk("selecting %d\n",drive); 281 #endif 282 if (drive == selected) 283 return; 284 get_fdc(drive); 285 selected = drive; 286 287 if (unit[drive].track % 2 != 0) 288 prb &= ~DSKSIDE; 289 if (unit[drive].motor == 1) 290 prb &= ~DSKMOTOR; 291 ciab.prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3)); 292 ciab.prb = prb; 293 prb &= ~SELMASK(drive); 294 ciab.prb = prb; 295 rel_fdc(); 296 } 297 298 static void fd_deselect (int drive) 299 { 300 unsigned char prb; 301 unsigned long flags; 302 303 drive&=3; 304 #ifdef DEBUG 305 printk("deselecting %d\n",drive); 306 #endif 307 if (drive != selected) { 308 printk(KERN_WARNING "Deselecting drive %d while %d was selected!\n",drive,selected); 309 return; 310 } 311 312 get_fdc(drive); 313 local_irq_save(flags); 314 315 selected = -1; 316 317 prb = ciab.prb; 318 prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3)); 319 ciab.prb = prb; 320 321 local_irq_restore (flags); 322 rel_fdc(); 323 324 } 325 326 static void motor_on_callback(unsigned long nr) 327 { 328 if (!(ciaa.pra & DSKRDY) || --on_attempts == 0) { 329 complete_all(&motor_on_completion); 330 } else { 331 motor_on_timer.expires = jiffies + HZ/10; 332 add_timer(&motor_on_timer); 333 } 334 } 335 336 static int fd_motor_on(int nr) 337 { 338 nr &= 3; 339 340 del_timer(motor_off_timer + nr); 341 342 if (!unit[nr].motor) { 343 unit[nr].motor = 1; 344 fd_select(nr); 345 346 reinit_completion(&motor_on_completion); 347 motor_on_timer.data = nr; 348 mod_timer(&motor_on_timer, jiffies + HZ/2); 349 350 on_attempts = 10; 351 wait_for_completion(&motor_on_completion); 352 fd_deselect(nr); 353 } 354 355 if (on_attempts == 0) { 356 on_attempts = -1; 357 #if 0 358 printk (KERN_ERR "motor_on failed, turning motor off\n"); 359 fd_motor_off (nr); 360 return 0; 361 #else 362 printk (KERN_WARNING "DSKRDY not set after 1.5 seconds - assuming drive is spinning notwithstanding\n"); 363 #endif 364 } 365 366 return 1; 367 } 368 369 static void fd_motor_off(unsigned long drive) 370 { 371 long calledfromint; 372 #ifdef MODULE 373 long decusecount; 374 375 decusecount = drive & 0x40000000; 376 #endif 377 calledfromint = drive & 0x80000000; 378 drive&=3; 379 if (calledfromint && !try_fdc(drive)) { 380 /* We would be blocked in an interrupt, so try again later */ 381 motor_off_timer[drive].expires = jiffies + 1; 382 add_timer(motor_off_timer + drive); 383 return; 384 } 385 unit[drive].motor = 0; 386 fd_select(drive); 387 udelay (1); 388 fd_deselect(drive); 389 } 390 391 static void floppy_off (unsigned int nr) 392 { 393 int drive; 394 395 drive = nr & 3; 396 /* called this way it is always from interrupt */ 397 motor_off_timer[drive].data = nr | 0x80000000; 398 mod_timer(motor_off_timer + drive, jiffies + 3*HZ); 399 } 400 401 static int fd_calibrate(int drive) 402 { 403 unsigned char prb; 404 int n; 405 406 drive &= 3; 407 get_fdc(drive); 408 if (!fd_motor_on (drive)) 409 return 0; 410 fd_select (drive); 411 prb = ciab.prb; 412 prb |= DSKSIDE; 413 prb &= ~DSKDIREC; 414 ciab.prb = prb; 415 for (n = unit[drive].type->tracks/2; n != 0; --n) { 416 if (ciaa.pra & DSKTRACK0) 417 break; 418 prb &= ~DSKSTEP; 419 ciab.prb = prb; 420 prb |= DSKSTEP; 421 udelay (2); 422 ciab.prb = prb; 423 ms_delay(unit[drive].type->step_delay); 424 } 425 ms_delay (unit[drive].type->settle_time); 426 prb |= DSKDIREC; 427 n = unit[drive].type->tracks + 20; 428 for (;;) { 429 prb &= ~DSKSTEP; 430 ciab.prb = prb; 431 prb |= DSKSTEP; 432 udelay (2); 433 ciab.prb = prb; 434 ms_delay(unit[drive].type->step_delay + 1); 435 if ((ciaa.pra & DSKTRACK0) == 0) 436 break; 437 if (--n == 0) { 438 printk (KERN_ERR "fd%d: calibrate failed, turning motor off\n", drive); 439 fd_motor_off (drive); 440 unit[drive].track = -1; 441 rel_fdc(); 442 return 0; 443 } 444 } 445 unit[drive].track = 0; 446 ms_delay(unit[drive].type->settle_time); 447 448 rel_fdc(); 449 fd_deselect(drive); 450 return 1; 451 } 452 453 static int fd_seek(int drive, int track) 454 { 455 unsigned char prb; 456 int cnt; 457 458 #ifdef DEBUG 459 printk("seeking drive %d to track %d\n",drive,track); 460 #endif 461 drive &= 3; 462 get_fdc(drive); 463 if (unit[drive].track == track) { 464 rel_fdc(); 465 return 1; 466 } 467 if (!fd_motor_on(drive)) { 468 rel_fdc(); 469 return 0; 470 } 471 if (unit[drive].track < 0 && !fd_calibrate(drive)) { 472 rel_fdc(); 473 return 0; 474 } 475 476 fd_select (drive); 477 cnt = unit[drive].track/2 - track/2; 478 prb = ciab.prb; 479 prb |= DSKSIDE | DSKDIREC; 480 if (track % 2 != 0) 481 prb &= ~DSKSIDE; 482 if (cnt < 0) { 483 cnt = - cnt; 484 prb &= ~DSKDIREC; 485 } 486 ciab.prb = prb; 487 if (track % 2 != unit[drive].track % 2) 488 ms_delay (unit[drive].type->side_time); 489 unit[drive].track = track; 490 if (cnt == 0) { 491 rel_fdc(); 492 fd_deselect(drive); 493 return 1; 494 } 495 do { 496 prb &= ~DSKSTEP; 497 ciab.prb = prb; 498 prb |= DSKSTEP; 499 udelay (1); 500 ciab.prb = prb; 501 ms_delay (unit[drive].type->step_delay); 502 } while (--cnt != 0); 503 ms_delay (unit[drive].type->settle_time); 504 505 rel_fdc(); 506 fd_deselect(drive); 507 return 1; 508 } 509 510 static unsigned long fd_get_drive_id(int drive) 511 { 512 int i; 513 ulong id = 0; 514 515 drive&=3; 516 get_fdc(drive); 517 /* set up for ID */ 518 MOTOR_ON; 519 udelay(2); 520 SELECT(SELMASK(drive)); 521 udelay(2); 522 DESELECT(SELMASK(drive)); 523 udelay(2); 524 MOTOR_OFF; 525 udelay(2); 526 SELECT(SELMASK(drive)); 527 udelay(2); 528 DESELECT(SELMASK(drive)); 529 udelay(2); 530 531 /* loop and read disk ID */ 532 for (i=0; i<32; i++) { 533 SELECT(SELMASK(drive)); 534 udelay(2); 535 536 /* read and store value of DSKRDY */ 537 id <<= 1; 538 id |= (ciaa.pra & DSKRDY) ? 0 : 1; /* cia regs are low-active! */ 539 540 DESELECT(SELMASK(drive)); 541 } 542 543 rel_fdc(); 544 545 /* 546 * RB: At least A500/A2000's df0: don't identify themselves. 547 * As every (real) Amiga has at least a 3.5" DD drive as df0: 548 * we default to that if df0: doesn't identify as a certain 549 * type. 550 */ 551 if(drive == 0 && id == FD_NODRIVE) 552 { 553 id = fd_def_df0; 554 printk(KERN_NOTICE "fd: drive 0 didn't identify, setting default %08lx\n", (ulong)fd_def_df0); 555 } 556 /* return the ID value */ 557 return (id); 558 } 559 560 static irqreturn_t fd_block_done(int irq, void *dummy) 561 { 562 if (block_flag) 563 custom.dsklen = 0x4000; 564 565 if (block_flag == 2) { /* writing */ 566 writepending = 2; 567 post_write_timer.expires = jiffies + 1; /* at least 2 ms */ 568 post_write_timer.data = selected; 569 add_timer(&post_write_timer); 570 } 571 else { /* reading */ 572 block_flag = 0; 573 wake_up (&wait_fd_block); 574 } 575 return IRQ_HANDLED; 576 } 577 578 static void raw_read(int drive) 579 { 580 drive&=3; 581 get_fdc(drive); 582 wait_event(wait_fd_block, !block_flag); 583 fd_select(drive); 584 /* setup adkcon bits correctly */ 585 custom.adkcon = ADK_MSBSYNC; 586 custom.adkcon = ADK_SETCLR|ADK_WORDSYNC|ADK_FAST; 587 588 custom.dsksync = MFM_SYNC; 589 590 custom.dsklen = 0; 591 custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf); 592 custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN; 593 custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN; 594 595 block_flag = 1; 596 597 wait_event(wait_fd_block, !block_flag); 598 599 custom.dsklen = 0; 600 fd_deselect(drive); 601 rel_fdc(); 602 } 603 604 static int raw_write(int drive) 605 { 606 ushort adk; 607 608 drive&=3; 609 get_fdc(drive); /* corresponds to rel_fdc() in post_write() */ 610 if ((ciaa.pra & DSKPROT) == 0) { 611 rel_fdc(); 612 return 0; 613 } 614 wait_event(wait_fd_block, !block_flag); 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 */ 639 static 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 */ 661 662 static 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 } 675 676 static 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 } 687 688 static 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 } 707 708 struct 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 }; 717 718 static 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 } 781 782 static 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 } 795 796 static 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 } 813 814 static 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 } 847 848 static 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 } 863 864 865 struct 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... 926 927 928 my only works was to code this from manx to C.... 929 930 */ 931 932 static 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 } 988 989 static inline ushort dos_hdr_crc (struct dos_header *hdr) 990 { 991 return dos_crc(&(hdr->track), 0xb2, 0x30, 3); /* precomputed magic */ 992 } 993 994 static inline ushort dos_data_crc(unsigned char *data) 995 { 996 return dos_crc(data, 0xe2, 0x95 ,511); /* precomputed magic */ 997 } 998 999 static 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 1015 static 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 1025 static 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 1033 static 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 1130 static 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 1143 static 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 1154 static 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 1205 static 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 1245 /* FIXME: this assumes the drive is still spinning - 1246 * which is only true if we complete writing a track within three seconds 1247 */ 1248 static void flush_track_callback(unsigned long nr) 1249 { 1250 nr&=3; 1251 writefromint = 1; 1252 if (!try_fdc(nr)) { 1253 /* we might block in an interrupt, so try again later */ 1254 flush_track_timer[nr].expires = jiffies + 1; 1255 add_timer(flush_track_timer + nr); 1256 return; 1257 } 1258 get_fdc(nr); 1259 (*unit[nr].dtype->write_fkt)(nr); 1260 if (!raw_write(nr)) { 1261 printk (KERN_NOTICE "floppy disk write protected\n"); 1262 writefromint = 0; 1263 writepending = 0; 1264 } 1265 rel_fdc(); 1266 } 1267 1268 static int non_int_flush_track (unsigned long nr) 1269 { 1270 unsigned long flags; 1271 1272 nr&=3; 1273 writefromint = 0; 1274 del_timer(&post_write_timer); 1275 get_fdc(nr); 1276 if (!fd_motor_on(nr)) { 1277 writepending = 0; 1278 rel_fdc(); 1279 return 0; 1280 } 1281 local_irq_save(flags); 1282 if (writepending != 2) { 1283 local_irq_restore(flags); 1284 (*unit[nr].dtype->write_fkt)(nr); 1285 if (!raw_write(nr)) { 1286 printk (KERN_NOTICE "floppy disk write protected " 1287 "in write!\n"); 1288 writepending = 0; 1289 return 0; 1290 } 1291 wait_event(wait_fd_block, block_flag != 2); 1292 } 1293 else { 1294 local_irq_restore(flags); 1295 ms_delay(2); /* 2 ms post_write delay */ 1296 post_write(nr); 1297 } 1298 rel_fdc(); 1299 return 1; 1300 } 1301 1302 static int get_track(int drive, int track) 1303 { 1304 int error, errcnt; 1305 1306 drive&=3; 1307 if (unit[drive].track == track) 1308 return 0; 1309 get_fdc(drive); 1310 if (!fd_motor_on(drive)) { 1311 rel_fdc(); 1312 return -1; 1313 } 1314 1315 if (unit[drive].dirty == 1) { 1316 del_timer (flush_track_timer + drive); 1317 non_int_flush_track (drive); 1318 } 1319 errcnt = 0; 1320 while (errcnt < MAX_ERRORS) { 1321 if (!fd_seek(drive, track)) 1322 return -1; 1323 raw_read(drive); 1324 error = (*unit[drive].dtype->read_fkt)(drive); 1325 if (error == 0) { 1326 rel_fdc(); 1327 return 0; 1328 } 1329 /* Read Error Handling: recalibrate and try again */ 1330 unit[drive].track = -1; 1331 errcnt++; 1332 } 1333 rel_fdc(); 1334 return -1; 1335 } 1336 1337 /* 1338 * Round-robin between our available drives, doing one request from each 1339 */ 1340 static struct request *set_next_request(void) 1341 { 1342 struct request_queue *q; 1343 int cnt = FD_MAX_UNITS; 1344 struct request *rq = NULL; 1345 1346 /* Find next queue we can dispatch from */ 1347 fdc_queue = fdc_queue + 1; 1348 if (fdc_queue == FD_MAX_UNITS) 1349 fdc_queue = 0; 1350 1351 for(cnt = FD_MAX_UNITS; cnt > 0; cnt--) { 1352 1353 if (unit[fdc_queue].type->code == FD_NODRIVE) { 1354 if (++fdc_queue == FD_MAX_UNITS) 1355 fdc_queue = 0; 1356 continue; 1357 } 1358 1359 q = unit[fdc_queue].gendisk->queue; 1360 if (q) { 1361 rq = blk_fetch_request(q); 1362 if (rq) 1363 break; 1364 } 1365 1366 if (++fdc_queue == FD_MAX_UNITS) 1367 fdc_queue = 0; 1368 } 1369 1370 return rq; 1371 } 1372 1373 static void redo_fd_request(void) 1374 { 1375 struct request *rq; 1376 unsigned int cnt, block, track, sector; 1377 int drive; 1378 struct amiga_floppy_struct *floppy; 1379 char *data; 1380 unsigned long flags; 1381 int err; 1382 1383 next_req: 1384 rq = set_next_request(); 1385 if (!rq) { 1386 /* Nothing left to do */ 1387 return; 1388 } 1389 1390 floppy = rq->rq_disk->private_data; 1391 drive = floppy - unit; 1392 1393 next_segment: 1394 /* Here someone could investigate to be more efficient */ 1395 for (cnt = 0, err = 0; cnt < blk_rq_cur_sectors(rq); cnt++) { 1396 #ifdef DEBUG 1397 printk("fd: sector %ld + %d requested for %s\n", 1398 blk_rq_pos(rq), cnt, 1399 (rq_data_dir(rq) == READ) ? "read" : "write"); 1400 #endif 1401 block = blk_rq_pos(rq) + cnt; 1402 if ((int)block > floppy->blocks) { 1403 err = -EIO; 1404 break; 1405 } 1406 1407 track = block / (floppy->dtype->sects * floppy->type->sect_mult); 1408 sector = block % (floppy->dtype->sects * floppy->type->sect_mult); 1409 data = bio_data(rq->bio) + 512 * cnt; 1410 #ifdef DEBUG 1411 printk("access to track %d, sector %d, with buffer at " 1412 "0x%08lx\n", track, sector, data); 1413 #endif 1414 1415 if (get_track(drive, track) == -1) { 1416 err = -EIO; 1417 break; 1418 } 1419 1420 if (rq_data_dir(rq) == READ) { 1421 memcpy(data, floppy->trackbuf + sector * 512, 512); 1422 } else { 1423 memcpy(floppy->trackbuf + sector * 512, data, 512); 1424 1425 /* keep the drive spinning while writes are scheduled */ 1426 if (!fd_motor_on(drive)) { 1427 err = -EIO; 1428 break; 1429 } 1430 /* 1431 * setup a callback to write the track buffer 1432 * after a short (1 tick) delay. 1433 */ 1434 local_irq_save(flags); 1435 1436 floppy->dirty = 1; 1437 /* reset the timer */ 1438 mod_timer (flush_track_timer + drive, jiffies + 1); 1439 local_irq_restore(flags); 1440 } 1441 } 1442 1443 if (__blk_end_request_cur(rq, err)) 1444 goto next_segment; 1445 goto next_req; 1446 } 1447 1448 static void do_fd_request(struct request_queue * q) 1449 { 1450 redo_fd_request(); 1451 } 1452 1453 static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 1454 { 1455 int drive = MINOR(bdev->bd_dev) & 3; 1456 1457 geo->heads = unit[drive].type->heads; 1458 geo->sectors = unit[drive].dtype->sects * unit[drive].type->sect_mult; 1459 geo->cylinders = unit[drive].type->tracks; 1460 return 0; 1461 } 1462 1463 static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, 1464 unsigned int cmd, unsigned long param) 1465 { 1466 struct amiga_floppy_struct *p = bdev->bd_disk->private_data; 1467 int drive = p - unit; 1468 static struct floppy_struct getprm; 1469 void __user *argp = (void __user *)param; 1470 1471 switch(cmd){ 1472 case FDFMTBEG: 1473 get_fdc(drive); 1474 if (fd_ref[drive] > 1) { 1475 rel_fdc(); 1476 return -EBUSY; 1477 } 1478 fsync_bdev(bdev); 1479 if (fd_motor_on(drive) == 0) { 1480 rel_fdc(); 1481 return -ENODEV; 1482 } 1483 if (fd_calibrate(drive) == 0) { 1484 rel_fdc(); 1485 return -ENXIO; 1486 } 1487 floppy_off(drive); 1488 rel_fdc(); 1489 break; 1490 case FDFMTTRK: 1491 if (param < p->type->tracks * p->type->heads) 1492 { 1493 get_fdc(drive); 1494 if (fd_seek(drive,param) != 0){ 1495 memset(p->trackbuf, FD_FILL_BYTE, 1496 p->dtype->sects * p->type->sect_mult * 512); 1497 non_int_flush_track(drive); 1498 } 1499 floppy_off(drive); 1500 rel_fdc(); 1501 } 1502 else 1503 return -EINVAL; 1504 break; 1505 case FDFMTEND: 1506 floppy_off(drive); 1507 invalidate_bdev(bdev); 1508 break; 1509 case FDGETPRM: 1510 memset((void *)&getprm, 0, sizeof (getprm)); 1511 getprm.track=p->type->tracks; 1512 getprm.head=p->type->heads; 1513 getprm.sect=p->dtype->sects * p->type->sect_mult; 1514 getprm.size=p->blocks; 1515 if (copy_to_user(argp, &getprm, sizeof(struct floppy_struct))) 1516 return -EFAULT; 1517 break; 1518 case FDSETPRM: 1519 case FDDEFPRM: 1520 return -EINVAL; 1521 case FDFLUSH: /* unconditionally, even if not needed */ 1522 del_timer (flush_track_timer + drive); 1523 non_int_flush_track(drive); 1524 break; 1525 #ifdef RAW_IOCTL 1526 case IOCTL_RAW_TRACK: 1527 if (copy_to_user(argp, raw_buf, p->type->read_size)) 1528 return -EFAULT; 1529 else 1530 return p->type->read_size; 1531 #endif 1532 default: 1533 printk(KERN_DEBUG "fd_ioctl: unknown cmd %d for drive %d.", 1534 cmd, drive); 1535 return -ENOSYS; 1536 } 1537 return 0; 1538 } 1539 1540 static int fd_ioctl(struct block_device *bdev, fmode_t mode, 1541 unsigned int cmd, unsigned long param) 1542 { 1543 int ret; 1544 1545 mutex_lock(&amiflop_mutex); 1546 ret = fd_locked_ioctl(bdev, mode, cmd, param); 1547 mutex_unlock(&amiflop_mutex); 1548 1549 return ret; 1550 } 1551 1552 static void fd_probe(int dev) 1553 { 1554 unsigned long code; 1555 int type; 1556 int drive; 1557 1558 drive = dev & 3; 1559 code = fd_get_drive_id(drive); 1560 1561 /* get drive type */ 1562 for (type = 0; type < num_dr_types; type++) 1563 if (drive_types[type].code == code) 1564 break; 1565 1566 if (type >= num_dr_types) { 1567 printk(KERN_WARNING "fd_probe: unsupported drive type " 1568 "%08lx found\n", code); 1569 unit[drive].type = &drive_types[num_dr_types-1]; /* FD_NODRIVE */ 1570 return; 1571 } 1572 1573 unit[drive].type = drive_types + type; 1574 unit[drive].track = -1; 1575 1576 unit[drive].disk = -1; 1577 unit[drive].motor = 0; 1578 unit[drive].busy = 0; 1579 unit[drive].status = -1; 1580 } 1581 1582 /* 1583 * floppy_open check for aliasing (/dev/fd0 can be the same as 1584 * /dev/PS0 etc), and disallows simultaneous access to the same 1585 * drive with different device numbers. 1586 */ 1587 static int floppy_open(struct block_device *bdev, fmode_t mode) 1588 { 1589 int drive = MINOR(bdev->bd_dev) & 3; 1590 int system = (MINOR(bdev->bd_dev) & 4) >> 2; 1591 int old_dev; 1592 unsigned long flags; 1593 1594 mutex_lock(&amiflop_mutex); 1595 old_dev = fd_device[drive]; 1596 1597 if (fd_ref[drive] && old_dev != system) { 1598 mutex_unlock(&amiflop_mutex); 1599 return -EBUSY; 1600 } 1601 1602 if (mode & (FMODE_READ|FMODE_WRITE)) { 1603 check_disk_change(bdev); 1604 if (mode & FMODE_WRITE) { 1605 int wrprot; 1606 1607 get_fdc(drive); 1608 fd_select (drive); 1609 wrprot = !(ciaa.pra & DSKPROT); 1610 fd_deselect (drive); 1611 rel_fdc(); 1612 1613 if (wrprot) { 1614 mutex_unlock(&amiflop_mutex); 1615 return -EROFS; 1616 } 1617 } 1618 } 1619 1620 local_irq_save(flags); 1621 fd_ref[drive]++; 1622 fd_device[drive] = system; 1623 local_irq_restore(flags); 1624 1625 unit[drive].dtype=&data_types[system]; 1626 unit[drive].blocks=unit[drive].type->heads*unit[drive].type->tracks* 1627 data_types[system].sects*unit[drive].type->sect_mult; 1628 set_capacity(unit[drive].gendisk, unit[drive].blocks); 1629 1630 printk(KERN_INFO "fd%d: accessing %s-disk with %s-layout\n",drive, 1631 unit[drive].type->name, data_types[system].name); 1632 1633 mutex_unlock(&amiflop_mutex); 1634 return 0; 1635 } 1636 1637 static void floppy_release(struct gendisk *disk, fmode_t mode) 1638 { 1639 struct amiga_floppy_struct *p = disk->private_data; 1640 int drive = p - unit; 1641 1642 mutex_lock(&amiflop_mutex); 1643 if (unit[drive].dirty == 1) { 1644 del_timer (flush_track_timer + drive); 1645 non_int_flush_track (drive); 1646 } 1647 1648 if (!fd_ref[drive]--) { 1649 printk(KERN_CRIT "floppy_release with fd_ref == 0"); 1650 fd_ref[drive] = 0; 1651 } 1652 #ifdef MODULE 1653 /* the mod_use counter is handled this way */ 1654 floppy_off (drive | 0x40000000); 1655 #endif 1656 mutex_unlock(&amiflop_mutex); 1657 } 1658 1659 /* 1660 * check_events is never called from an interrupt, so we can relax a bit 1661 * here, sleep etc. Note that floppy-on tries to set current_DOR to point 1662 * to the desired drive, but it will probably not survive the sleep if 1663 * several floppies are used at the same time: thus the loop. 1664 */ 1665 static unsigned amiga_check_events(struct gendisk *disk, unsigned int clearing) 1666 { 1667 struct amiga_floppy_struct *p = disk->private_data; 1668 int drive = p - unit; 1669 int changed; 1670 static int first_time = 1; 1671 1672 if (first_time) 1673 changed = first_time--; 1674 else { 1675 get_fdc(drive); 1676 fd_select (drive); 1677 changed = !(ciaa.pra & DSKCHANGE); 1678 fd_deselect (drive); 1679 rel_fdc(); 1680 } 1681 1682 if (changed) { 1683 fd_probe(drive); 1684 p->track = -1; 1685 p->dirty = 0; 1686 writepending = 0; /* if this was true before, too bad! */ 1687 writefromint = 0; 1688 return DISK_EVENT_MEDIA_CHANGE; 1689 } 1690 return 0; 1691 } 1692 1693 static const struct block_device_operations floppy_fops = { 1694 .owner = THIS_MODULE, 1695 .open = floppy_open, 1696 .release = floppy_release, 1697 .ioctl = fd_ioctl, 1698 .getgeo = fd_getgeo, 1699 .check_events = amiga_check_events, 1700 }; 1701 1702 static int __init fd_probe_drives(void) 1703 { 1704 int drive,drives,nomem; 1705 1706 printk(KERN_INFO "FD: probing units\nfound "); 1707 drives=0; 1708 nomem=0; 1709 for(drive=0;drive<FD_MAX_UNITS;drive++) { 1710 struct gendisk *disk; 1711 fd_probe(drive); 1712 if (unit[drive].type->code == FD_NODRIVE) 1713 continue; 1714 disk = alloc_disk(1); 1715 if (!disk) { 1716 unit[drive].type->code = FD_NODRIVE; 1717 continue; 1718 } 1719 unit[drive].gendisk = disk; 1720 1721 disk->queue = blk_init_queue(do_fd_request, &amiflop_lock); 1722 if (!disk->queue) { 1723 unit[drive].type->code = FD_NODRIVE; 1724 continue; 1725 } 1726 1727 drives++; 1728 if ((unit[drive].trackbuf = kmalloc(FLOPPY_MAX_SECTORS * 512, GFP_KERNEL)) == NULL) { 1729 printk("no mem for "); 1730 unit[drive].type = &drive_types[num_dr_types - 1]; /* FD_NODRIVE */ 1731 drives--; 1732 nomem = 1; 1733 } 1734 printk("fd%d ",drive); 1735 disk->major = FLOPPY_MAJOR; 1736 disk->first_minor = drive; 1737 disk->fops = &floppy_fops; 1738 sprintf(disk->disk_name, "fd%d", drive); 1739 disk->private_data = &unit[drive]; 1740 set_capacity(disk, 880*2); 1741 add_disk(disk); 1742 } 1743 if ((drives > 0) || (nomem == 0)) { 1744 if (drives == 0) 1745 printk("no drives"); 1746 printk("\n"); 1747 return drives; 1748 } 1749 printk("\n"); 1750 return -ENOMEM; 1751 } 1752 1753 static struct kobject *floppy_find(dev_t dev, int *part, void *data) 1754 { 1755 int drive = *part & 3; 1756 if (unit[drive].type->code == FD_NODRIVE) 1757 return NULL; 1758 *part = 0; 1759 return get_disk(unit[drive].gendisk); 1760 } 1761 1762 static int __init amiga_floppy_probe(struct platform_device *pdev) 1763 { 1764 int i, ret; 1765 1766 if (register_blkdev(FLOPPY_MAJOR,"fd")) 1767 return -EBUSY; 1768 1769 ret = -ENOMEM; 1770 raw_buf = amiga_chip_alloc(RAW_BUF_SIZE, "Floppy"); 1771 if (!raw_buf) { 1772 printk("fd: cannot get chip mem buffer\n"); 1773 goto out_blkdev; 1774 } 1775 1776 ret = -EBUSY; 1777 if (request_irq(IRQ_AMIGA_DSKBLK, fd_block_done, 0, "floppy_dma", NULL)) { 1778 printk("fd: cannot get irq for dma\n"); 1779 goto out_irq; 1780 } 1781 1782 if (request_irq(IRQ_AMIGA_CIAA_TB, ms_isr, 0, "floppy_timer", NULL)) { 1783 printk("fd: cannot get irq for timer\n"); 1784 goto out_irq2; 1785 } 1786 1787 ret = -ENODEV; 1788 if (fd_probe_drives() < 1) /* No usable drives */ 1789 goto out_probe; 1790 1791 blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE, 1792 floppy_find, NULL, NULL); 1793 1794 /* initialize variables */ 1795 init_timer(&motor_on_timer); 1796 motor_on_timer.expires = 0; 1797 motor_on_timer.data = 0; 1798 motor_on_timer.function = motor_on_callback; 1799 for (i = 0; i < FD_MAX_UNITS; i++) { 1800 init_timer(&motor_off_timer[i]); 1801 motor_off_timer[i].expires = 0; 1802 motor_off_timer[i].data = i|0x80000000; 1803 motor_off_timer[i].function = fd_motor_off; 1804 init_timer(&flush_track_timer[i]); 1805 flush_track_timer[i].expires = 0; 1806 flush_track_timer[i].data = i; 1807 flush_track_timer[i].function = flush_track_callback; 1808 1809 unit[i].track = -1; 1810 } 1811 1812 init_timer(&post_write_timer); 1813 post_write_timer.expires = 0; 1814 post_write_timer.data = 0; 1815 post_write_timer.function = post_write; 1816 1817 for (i = 0; i < 128; i++) 1818 mfmdecode[i]=255; 1819 for (i = 0; i < 16; i++) 1820 mfmdecode[mfmencode[i]]=i; 1821 1822 /* make sure that disk DMA is enabled */ 1823 custom.dmacon = DMAF_SETCLR | DMAF_DISK; 1824 1825 /* init ms timer */ 1826 ciaa.crb = 8; /* one-shot, stop */ 1827 return 0; 1828 1829 out_probe: 1830 free_irq(IRQ_AMIGA_CIAA_TB, NULL); 1831 out_irq2: 1832 free_irq(IRQ_AMIGA_DSKBLK, NULL); 1833 out_irq: 1834 amiga_chip_free(raw_buf); 1835 out_blkdev: 1836 unregister_blkdev(FLOPPY_MAJOR,"fd"); 1837 return ret; 1838 } 1839 1840 #if 0 /* not safe to unload */ 1841 static int __exit amiga_floppy_remove(struct platform_device *pdev) 1842 { 1843 int i; 1844 1845 for( i = 0; i < FD_MAX_UNITS; i++) { 1846 if (unit[i].type->code != FD_NODRIVE) { 1847 struct request_queue *q = unit[i].gendisk->queue; 1848 del_gendisk(unit[i].gendisk); 1849 put_disk(unit[i].gendisk); 1850 kfree(unit[i].trackbuf); 1851 if (q) 1852 blk_cleanup_queue(q); 1853 } 1854 } 1855 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256); 1856 free_irq(IRQ_AMIGA_CIAA_TB, NULL); 1857 free_irq(IRQ_AMIGA_DSKBLK, NULL); 1858 custom.dmacon = DMAF_DISK; /* disable DMA */ 1859 amiga_chip_free(raw_buf); 1860 unregister_blkdev(FLOPPY_MAJOR, "fd"); 1861 } 1862 #endif 1863 1864 static struct platform_driver amiga_floppy_driver = { 1865 .driver = { 1866 .name = "amiga-floppy", 1867 }, 1868 }; 1869 1870 static int __init amiga_floppy_init(void) 1871 { 1872 return platform_driver_probe(&amiga_floppy_driver, amiga_floppy_probe); 1873 } 1874 1875 module_init(amiga_floppy_init); 1876 1877 #ifndef MODULE 1878 static int __init amiga_floppy_setup (char *str) 1879 { 1880 int n; 1881 if (!MACH_IS_AMIGA) 1882 return 0; 1883 if (!get_option(&str, &n)) 1884 return 0; 1885 printk (KERN_INFO "amiflop: Setting default df0 to %x\n", n); 1886 fd_def_df0 = n; 1887 return 1; 1888 } 1889 1890 __setup("floppy=", amiga_floppy_setup); 1891 #endif 1892 1893 MODULE_ALIAS("platform:amiga-floppy"); 1894