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