Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Roman Zippel | b5dc784 | 2006-06-25 05:47:00 -0700 | [diff] [blame^] | 67 | #include <linux/interrupt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
| 69 | #include <asm/setup.h> |
| 70 | #include <asm/uaccess.h> |
| 71 | #include <asm/amigahw.h> |
| 72 | #include <asm/amigaints.h> |
| 73 | #include <asm/irq.h> |
| 74 | |
| 75 | #undef DEBUG /* print _LOTS_ of infos */ |
| 76 | |
| 77 | #define RAW_IOCTL |
| 78 | #ifdef RAW_IOCTL |
| 79 | #define IOCTL_RAW_TRACK 0x5254524B /* 'RTRK' */ |
| 80 | #endif |
| 81 | |
| 82 | /* |
| 83 | * Defines |
| 84 | */ |
| 85 | |
| 86 | /* |
| 87 | * Error codes |
| 88 | */ |
| 89 | #define FD_OK 0 /* operation succeeded */ |
| 90 | #define FD_ERROR -1 /* general error (seek, read, write, etc) */ |
| 91 | #define FD_NOUNIT 1 /* unit does not exist */ |
| 92 | #define FD_UNITBUSY 2 /* unit already active */ |
| 93 | #define FD_NOTACTIVE 3 /* unit is not active */ |
| 94 | #define FD_NOTREADY 4 /* unit is not ready (motor not on/no disk) */ |
| 95 | |
| 96 | #define MFM_NOSYNC 1 |
| 97 | #define MFM_HEADER 2 |
| 98 | #define MFM_DATA 3 |
| 99 | #define MFM_TRACK 4 |
| 100 | |
| 101 | /* |
| 102 | * Floppy ID values |
| 103 | */ |
| 104 | #define FD_NODRIVE 0x00000000 /* response when no unit is present */ |
| 105 | #define FD_DD_3 0xffffffff /* double-density 3.5" (880K) drive */ |
| 106 | #define FD_HD_3 0x55555555 /* high-density 3.5" (1760K) drive */ |
| 107 | #define FD_DD_5 0xaaaaaaaa /* double-density 5.25" (440K) drive */ |
| 108 | |
| 109 | static unsigned long int fd_def_df0 = FD_DD_3; /* default for df0 if it doesn't identify */ |
| 110 | |
| 111 | module_param(fd_def_df0, ulong, 0); |
| 112 | MODULE_LICENSE("GPL"); |
| 113 | |
| 114 | static struct request_queue *floppy_queue; |
| 115 | #define QUEUE (floppy_queue) |
| 116 | #define CURRENT elv_next_request(floppy_queue) |
| 117 | |
| 118 | /* |
| 119 | * Macros |
| 120 | */ |
| 121 | #define MOTOR_ON (ciab.prb &= ~DSKMOTOR) |
| 122 | #define MOTOR_OFF (ciab.prb |= DSKMOTOR) |
| 123 | #define SELECT(mask) (ciab.prb &= ~mask) |
| 124 | #define DESELECT(mask) (ciab.prb |= mask) |
| 125 | #define SELMASK(drive) (1 << (3 + (drive & 3))) |
| 126 | |
| 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 | }; |
Tobias Klauser | 945f390 | 2006-01-08 01:05:11 -0800 | [diff] [blame] | 135 | static int num_dr_types = ARRAY_SIZE(drive_types); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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_WAIT_QUEUE_HEAD(motor_wait); |
| 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 | |
| 167 | static DEFINE_SPINLOCK(amiflop_lock); |
| 168 | |
| 169 | #define RAW_BUF_SIZE 30000 /* size of raw disk data */ |
| 170 | |
| 171 | /* |
| 172 | * These are global variables, as that's the easiest way to give |
| 173 | * information to interrupts. They are the data used for the current |
| 174 | * request. |
| 175 | */ |
| 176 | static volatile char block_flag; |
| 177 | static DECLARE_WAIT_QUEUE_HEAD(wait_fd_block); |
| 178 | |
| 179 | /* MS-Dos MFM Coding tables (should go quick and easy) */ |
| 180 | static unsigned char mfmencode[16]={ |
| 181 | 0x2a, 0x29, 0x24, 0x25, 0x12, 0x11, 0x14, 0x15, |
| 182 | 0x4a, 0x49, 0x44, 0x45, 0x52, 0x51, 0x54, 0x55 |
| 183 | }; |
| 184 | static unsigned char mfmdecode[128]; |
| 185 | |
| 186 | /* floppy internal millisecond timer stuff */ |
| 187 | static volatile int ms_busy = -1; |
| 188 | static DECLARE_WAIT_QUEUE_HEAD(ms_wait); |
| 189 | #define MS_TICKS ((amiga_eclock+50)/1000) |
| 190 | |
| 191 | /* |
| 192 | * Note that MAX_ERRORS=X doesn't imply that we retry every bad read |
| 193 | * max X times - some types of errors increase the errorcount by 2 or |
| 194 | * even 3, so we might actually retry only X/2 times before giving up. |
| 195 | */ |
| 196 | #define MAX_ERRORS 12 |
| 197 | |
Al Viro | b4290a2 | 2006-01-12 01:06:12 -0800 | [diff] [blame] | 198 | #define custom amiga_custom |
| 199 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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, struct pt_regs *fp) |
| 213 | { |
| 214 | ms_busy = -1; |
| 215 | wake_up(&ms_wait); |
| 216 | return IRQ_HANDLED; |
| 217 | } |
| 218 | |
| 219 | /* all waits are queued up |
| 220 | A more generic routine would do a schedule a la timer.device */ |
| 221 | static void ms_delay(int ms) |
| 222 | { |
| 223 | unsigned long flags; |
| 224 | int ticks; |
| 225 | if (ms > 0) { |
| 226 | local_irq_save(flags); |
| 227 | while (ms_busy == 0) |
| 228 | sleep_on(&ms_wait); |
| 229 | ms_busy = 0; |
| 230 | local_irq_restore(flags); |
| 231 | ticks = MS_TICKS*ms-1; |
| 232 | ciaa.tblo=ticks%256; |
| 233 | ciaa.tbhi=ticks/256; |
| 234 | ciaa.crb=0x19; /*count eclock, force load, one-shoot, start */ |
| 235 | sleep_on(&ms_wait); |
| 236 | } |
| 237 | } |
| 238 | |
| 239 | /* Hardware semaphore */ |
| 240 | |
| 241 | /* returns true when we would get the semaphore */ |
| 242 | static inline int try_fdc(int drive) |
| 243 | { |
| 244 | drive &= 3; |
| 245 | return ((fdc_busy < 0) || (fdc_busy == drive)); |
| 246 | } |
| 247 | |
| 248 | static void get_fdc(int drive) |
| 249 | { |
| 250 | unsigned long flags; |
| 251 | |
| 252 | drive &= 3; |
| 253 | #ifdef DEBUG |
| 254 | printk("get_fdc: drive %d fdc_busy %d fdc_nested %d\n",drive,fdc_busy,fdc_nested); |
| 255 | #endif |
| 256 | local_irq_save(flags); |
| 257 | while (!try_fdc(drive)) |
| 258 | sleep_on(&fdc_wait); |
| 259 | fdc_busy = drive; |
| 260 | fdc_nested++; |
| 261 | local_irq_restore(flags); |
| 262 | } |
| 263 | |
| 264 | static inline void rel_fdc(void) |
| 265 | { |
| 266 | #ifdef DEBUG |
| 267 | if (fdc_nested == 0) |
| 268 | printk("fd: unmatched rel_fdc\n"); |
| 269 | printk("rel_fdc: fdc_busy %d fdc_nested %d\n",fdc_busy,fdc_nested); |
| 270 | #endif |
| 271 | fdc_nested--; |
| 272 | if (fdc_nested == 0) { |
| 273 | fdc_busy = -1; |
| 274 | wake_up(&fdc_wait); |
| 275 | } |
| 276 | } |
| 277 | |
| 278 | static void fd_select (int drive) |
| 279 | { |
| 280 | unsigned char prb = ~0; |
| 281 | |
| 282 | drive&=3; |
| 283 | #ifdef DEBUG |
| 284 | printk("selecting %d\n",drive); |
| 285 | #endif |
| 286 | if (drive == selected) |
| 287 | return; |
| 288 | get_fdc(drive); |
| 289 | selected = drive; |
| 290 | |
| 291 | if (unit[drive].track % 2 != 0) |
| 292 | prb &= ~DSKSIDE; |
| 293 | if (unit[drive].motor == 1) |
| 294 | prb &= ~DSKMOTOR; |
| 295 | ciab.prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3)); |
| 296 | ciab.prb = prb; |
| 297 | prb &= ~SELMASK(drive); |
| 298 | ciab.prb = prb; |
| 299 | rel_fdc(); |
| 300 | } |
| 301 | |
| 302 | static void fd_deselect (int drive) |
| 303 | { |
| 304 | unsigned char prb; |
| 305 | unsigned long flags; |
| 306 | |
| 307 | drive&=3; |
| 308 | #ifdef DEBUG |
| 309 | printk("deselecting %d\n",drive); |
| 310 | #endif |
| 311 | if (drive != selected) { |
| 312 | printk(KERN_WARNING "Deselecting drive %d while %d was selected!\n",drive,selected); |
| 313 | return; |
| 314 | } |
| 315 | |
| 316 | get_fdc(drive); |
| 317 | local_irq_save(flags); |
| 318 | |
| 319 | selected = -1; |
| 320 | |
| 321 | prb = ciab.prb; |
| 322 | prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3)); |
| 323 | ciab.prb = prb; |
| 324 | |
| 325 | local_irq_restore (flags); |
| 326 | rel_fdc(); |
| 327 | |
| 328 | } |
| 329 | |
| 330 | static void motor_on_callback(unsigned long nr) |
| 331 | { |
| 332 | if (!(ciaa.pra & DSKRDY) || --on_attempts == 0) { |
| 333 | wake_up (&motor_wait); |
| 334 | } else { |
| 335 | motor_on_timer.expires = jiffies + HZ/10; |
| 336 | add_timer(&motor_on_timer); |
| 337 | } |
| 338 | } |
| 339 | |
| 340 | static int fd_motor_on(int nr) |
| 341 | { |
| 342 | nr &= 3; |
| 343 | |
| 344 | del_timer(motor_off_timer + nr); |
| 345 | |
| 346 | if (!unit[nr].motor) { |
| 347 | unit[nr].motor = 1; |
| 348 | fd_select(nr); |
| 349 | |
| 350 | motor_on_timer.data = nr; |
| 351 | mod_timer(&motor_on_timer, jiffies + HZ/2); |
| 352 | |
| 353 | on_attempts = 10; |
| 354 | sleep_on (&motor_wait); |
| 355 | fd_deselect(nr); |
| 356 | } |
| 357 | |
| 358 | if (on_attempts == 0) { |
| 359 | on_attempts = -1; |
| 360 | #if 0 |
| 361 | printk (KERN_ERR "motor_on failed, turning motor off\n"); |
| 362 | fd_motor_off (nr); |
| 363 | return 0; |
| 364 | #else |
| 365 | printk (KERN_WARNING "DSKRDY not set after 1.5 seconds - assuming drive is spinning notwithstanding\n"); |
| 366 | #endif |
| 367 | } |
| 368 | |
| 369 | return 1; |
| 370 | } |
| 371 | |
| 372 | static void fd_motor_off(unsigned long drive) |
| 373 | { |
| 374 | long calledfromint; |
| 375 | #ifdef MODULE |
| 376 | long decusecount; |
| 377 | |
| 378 | decusecount = drive & 0x40000000; |
| 379 | #endif |
| 380 | calledfromint = drive & 0x80000000; |
| 381 | drive&=3; |
| 382 | if (calledfromint && !try_fdc(drive)) { |
| 383 | /* We would be blocked in an interrupt, so try again later */ |
| 384 | motor_off_timer[drive].expires = jiffies + 1; |
| 385 | add_timer(motor_off_timer + drive); |
| 386 | return; |
| 387 | } |
| 388 | unit[drive].motor = 0; |
| 389 | fd_select(drive); |
| 390 | udelay (1); |
| 391 | fd_deselect(drive); |
| 392 | } |
| 393 | |
| 394 | static void floppy_off (unsigned int nr) |
| 395 | { |
| 396 | int drive; |
| 397 | |
| 398 | drive = nr & 3; |
| 399 | /* called this way it is always from interrupt */ |
| 400 | motor_off_timer[drive].data = nr | 0x80000000; |
| 401 | mod_timer(motor_off_timer + drive, jiffies + 3*HZ); |
| 402 | } |
| 403 | |
| 404 | static int fd_calibrate(int drive) |
| 405 | { |
| 406 | unsigned char prb; |
| 407 | int n; |
| 408 | |
| 409 | drive &= 3; |
| 410 | get_fdc(drive); |
| 411 | if (!fd_motor_on (drive)) |
| 412 | return 0; |
| 413 | fd_select (drive); |
| 414 | prb = ciab.prb; |
| 415 | prb |= DSKSIDE; |
| 416 | prb &= ~DSKDIREC; |
| 417 | ciab.prb = prb; |
| 418 | for (n = unit[drive].type->tracks/2; n != 0; --n) { |
| 419 | if (ciaa.pra & DSKTRACK0) |
| 420 | break; |
| 421 | prb &= ~DSKSTEP; |
| 422 | ciab.prb = prb; |
| 423 | prb |= DSKSTEP; |
| 424 | udelay (2); |
| 425 | ciab.prb = prb; |
| 426 | ms_delay(unit[drive].type->step_delay); |
| 427 | } |
| 428 | ms_delay (unit[drive].type->settle_time); |
| 429 | prb |= DSKDIREC; |
| 430 | n = unit[drive].type->tracks + 20; |
| 431 | for (;;) { |
| 432 | prb &= ~DSKSTEP; |
| 433 | ciab.prb = prb; |
| 434 | prb |= DSKSTEP; |
| 435 | udelay (2); |
| 436 | ciab.prb = prb; |
| 437 | ms_delay(unit[drive].type->step_delay + 1); |
| 438 | if ((ciaa.pra & DSKTRACK0) == 0) |
| 439 | break; |
| 440 | if (--n == 0) { |
| 441 | printk (KERN_ERR "fd%d: calibrate failed, turning motor off\n", drive); |
| 442 | fd_motor_off (drive); |
| 443 | unit[drive].track = -1; |
| 444 | rel_fdc(); |
| 445 | return 0; |
| 446 | } |
| 447 | } |
| 448 | unit[drive].track = 0; |
| 449 | ms_delay(unit[drive].type->settle_time); |
| 450 | |
| 451 | rel_fdc(); |
| 452 | fd_deselect(drive); |
| 453 | return 1; |
| 454 | } |
| 455 | |
| 456 | static int fd_seek(int drive, int track) |
| 457 | { |
| 458 | unsigned char prb; |
| 459 | int cnt; |
| 460 | |
| 461 | #ifdef DEBUG |
| 462 | printk("seeking drive %d to track %d\n",drive,track); |
| 463 | #endif |
| 464 | drive &= 3; |
| 465 | get_fdc(drive); |
| 466 | if (unit[drive].track == track) { |
| 467 | rel_fdc(); |
| 468 | return 1; |
| 469 | } |
| 470 | if (!fd_motor_on(drive)) { |
| 471 | rel_fdc(); |
| 472 | return 0; |
| 473 | } |
| 474 | if (unit[drive].track < 0 && !fd_calibrate(drive)) { |
| 475 | rel_fdc(); |
| 476 | return 0; |
| 477 | } |
| 478 | |
| 479 | fd_select (drive); |
| 480 | cnt = unit[drive].track/2 - track/2; |
| 481 | prb = ciab.prb; |
| 482 | prb |= DSKSIDE | DSKDIREC; |
| 483 | if (track % 2 != 0) |
| 484 | prb &= ~DSKSIDE; |
| 485 | if (cnt < 0) { |
| 486 | cnt = - cnt; |
| 487 | prb &= ~DSKDIREC; |
| 488 | } |
| 489 | ciab.prb = prb; |
| 490 | if (track % 2 != unit[drive].track % 2) |
| 491 | ms_delay (unit[drive].type->side_time); |
| 492 | unit[drive].track = track; |
| 493 | if (cnt == 0) { |
| 494 | rel_fdc(); |
| 495 | fd_deselect(drive); |
| 496 | return 1; |
| 497 | } |
| 498 | do { |
| 499 | prb &= ~DSKSTEP; |
| 500 | ciab.prb = prb; |
| 501 | prb |= DSKSTEP; |
| 502 | udelay (1); |
| 503 | ciab.prb = prb; |
| 504 | ms_delay (unit[drive].type->step_delay); |
| 505 | } while (--cnt != 0); |
| 506 | ms_delay (unit[drive].type->settle_time); |
| 507 | |
| 508 | rel_fdc(); |
| 509 | fd_deselect(drive); |
| 510 | return 1; |
| 511 | } |
| 512 | |
| 513 | static unsigned long fd_get_drive_id(int drive) |
| 514 | { |
| 515 | int i; |
| 516 | ulong id = 0; |
| 517 | |
| 518 | drive&=3; |
| 519 | get_fdc(drive); |
| 520 | /* set up for ID */ |
| 521 | MOTOR_ON; |
| 522 | udelay(2); |
| 523 | SELECT(SELMASK(drive)); |
| 524 | udelay(2); |
| 525 | DESELECT(SELMASK(drive)); |
| 526 | udelay(2); |
| 527 | MOTOR_OFF; |
| 528 | udelay(2); |
| 529 | SELECT(SELMASK(drive)); |
| 530 | udelay(2); |
| 531 | DESELECT(SELMASK(drive)); |
| 532 | udelay(2); |
| 533 | |
| 534 | /* loop and read disk ID */ |
| 535 | for (i=0; i<32; i++) { |
| 536 | SELECT(SELMASK(drive)); |
| 537 | udelay(2); |
| 538 | |
| 539 | /* read and store value of DSKRDY */ |
| 540 | id <<= 1; |
| 541 | id |= (ciaa.pra & DSKRDY) ? 0 : 1; /* cia regs are low-active! */ |
| 542 | |
| 543 | DESELECT(SELMASK(drive)); |
| 544 | } |
| 545 | |
| 546 | rel_fdc(); |
| 547 | |
| 548 | /* |
| 549 | * RB: At least A500/A2000's df0: don't identify themselves. |
| 550 | * As every (real) Amiga has at least a 3.5" DD drive as df0: |
| 551 | * we default to that if df0: doesn't identify as a certain |
| 552 | * type. |
| 553 | */ |
| 554 | if(drive == 0 && id == FD_NODRIVE) |
| 555 | { |
| 556 | id = fd_def_df0; |
| 557 | printk(KERN_NOTICE "fd: drive 0 didn't identify, setting default %08lx\n", (ulong)fd_def_df0); |
| 558 | } |
| 559 | /* return the ID value */ |
| 560 | return (id); |
| 561 | } |
| 562 | |
| 563 | static irqreturn_t fd_block_done(int irq, void *dummy, struct pt_regs *fp) |
| 564 | { |
| 565 | if (block_flag) |
| 566 | custom.dsklen = 0x4000; |
| 567 | |
| 568 | if (block_flag == 2) { /* writing */ |
| 569 | writepending = 2; |
| 570 | post_write_timer.expires = jiffies + 1; /* at least 2 ms */ |
| 571 | post_write_timer.data = selected; |
| 572 | add_timer(&post_write_timer); |
| 573 | } |
| 574 | else { /* reading */ |
| 575 | block_flag = 0; |
| 576 | wake_up (&wait_fd_block); |
| 577 | } |
| 578 | return IRQ_HANDLED; |
| 579 | } |
| 580 | |
| 581 | static void raw_read(int drive) |
| 582 | { |
| 583 | drive&=3; |
| 584 | get_fdc(drive); |
| 585 | while (block_flag) |
| 586 | sleep_on(&wait_fd_block); |
| 587 | fd_select(drive); |
| 588 | /* setup adkcon bits correctly */ |
| 589 | custom.adkcon = ADK_MSBSYNC; |
| 590 | custom.adkcon = ADK_SETCLR|ADK_WORDSYNC|ADK_FAST; |
| 591 | |
| 592 | custom.dsksync = MFM_SYNC; |
| 593 | |
| 594 | custom.dsklen = 0; |
| 595 | custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf); |
| 596 | custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN; |
| 597 | custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN; |
| 598 | |
| 599 | block_flag = 1; |
| 600 | |
| 601 | while (block_flag) |
| 602 | sleep_on (&wait_fd_block); |
| 603 | |
| 604 | custom.dsklen = 0; |
| 605 | fd_deselect(drive); |
| 606 | rel_fdc(); |
| 607 | } |
| 608 | |
| 609 | static int raw_write(int drive) |
| 610 | { |
| 611 | ushort adk; |
| 612 | |
| 613 | drive&=3; |
| 614 | get_fdc(drive); /* corresponds to rel_fdc() in post_write() */ |
| 615 | if ((ciaa.pra & DSKPROT) == 0) { |
| 616 | rel_fdc(); |
| 617 | return 0; |
| 618 | } |
| 619 | while (block_flag) |
| 620 | sleep_on(&wait_fd_block); |
| 621 | fd_select(drive); |
| 622 | /* clear adkcon bits */ |
| 623 | custom.adkcon = ADK_PRECOMP1|ADK_PRECOMP0|ADK_WORDSYNC|ADK_MSBSYNC; |
| 624 | /* set appropriate adkcon bits */ |
| 625 | adk = ADK_SETCLR|ADK_FAST; |
| 626 | if ((ulong)unit[drive].track >= unit[drive].type->precomp2) |
| 627 | adk |= ADK_PRECOMP1; |
| 628 | else if ((ulong)unit[drive].track >= unit[drive].type->precomp1) |
| 629 | adk |= ADK_PRECOMP0; |
| 630 | custom.adkcon = adk; |
| 631 | |
| 632 | custom.dsklen = DSKLEN_WRITE; |
| 633 | custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf); |
| 634 | custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE; |
| 635 | custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE; |
| 636 | |
| 637 | block_flag = 2; |
| 638 | return 1; |
| 639 | } |
| 640 | |
| 641 | /* |
| 642 | * to be called at least 2ms after the write has finished but before any |
| 643 | * other access to the hardware. |
| 644 | */ |
| 645 | static void post_write (unsigned long drive) |
| 646 | { |
| 647 | #ifdef DEBUG |
| 648 | printk("post_write for drive %ld\n",drive); |
| 649 | #endif |
| 650 | drive &= 3; |
| 651 | custom.dsklen = 0; |
| 652 | block_flag = 0; |
| 653 | writepending = 0; |
| 654 | writefromint = 0; |
| 655 | unit[drive].dirty = 0; |
| 656 | wake_up(&wait_fd_block); |
| 657 | fd_deselect(drive); |
| 658 | rel_fdc(); /* corresponds to get_fdc() in raw_write */ |
| 659 | } |
| 660 | |
| 661 | |
| 662 | /* |
| 663 | * The following functions are to convert the block contents into raw data |
| 664 | * written to disk and vice versa. |
| 665 | * (Add other formats here ;-)) |
| 666 | */ |
| 667 | |
| 668 | static unsigned long scan_sync(unsigned long raw, unsigned long end) |
| 669 | { |
| 670 | ushort *ptr = (ushort *)raw, *endp = (ushort *)end; |
| 671 | |
| 672 | while (ptr < endp && *ptr++ != 0x4489) |
| 673 | ; |
| 674 | if (ptr < endp) { |
| 675 | while (*ptr == 0x4489 && ptr < endp) |
| 676 | ptr++; |
| 677 | return (ulong)ptr; |
| 678 | } |
| 679 | return 0; |
| 680 | } |
| 681 | |
| 682 | static inline unsigned long checksum(unsigned long *addr, int len) |
| 683 | { |
| 684 | unsigned long csum = 0; |
| 685 | |
| 686 | len /= sizeof(*addr); |
| 687 | while (len-- > 0) |
| 688 | csum ^= *addr++; |
| 689 | csum = ((csum>>1) & 0x55555555) ^ (csum & 0x55555555); |
| 690 | |
| 691 | return csum; |
| 692 | } |
| 693 | |
| 694 | static unsigned long decode (unsigned long *data, unsigned long *raw, |
| 695 | int len) |
| 696 | { |
| 697 | ulong *odd, *even; |
| 698 | |
| 699 | /* convert length from bytes to longwords */ |
| 700 | len >>= 2; |
| 701 | odd = raw; |
| 702 | even = odd + len; |
| 703 | |
| 704 | /* prepare return pointer */ |
| 705 | raw += len * 2; |
| 706 | |
| 707 | do { |
| 708 | *data++ = ((*odd++ & 0x55555555) << 1) | (*even++ & 0x55555555); |
| 709 | } while (--len != 0); |
| 710 | |
| 711 | return (ulong)raw; |
| 712 | } |
| 713 | |
| 714 | struct header { |
| 715 | unsigned char magic; |
| 716 | unsigned char track; |
| 717 | unsigned char sect; |
| 718 | unsigned char ord; |
| 719 | unsigned char labels[16]; |
| 720 | unsigned long hdrchk; |
| 721 | unsigned long datachk; |
| 722 | }; |
| 723 | |
| 724 | static int amiga_read(int drive) |
| 725 | { |
| 726 | unsigned long raw; |
| 727 | unsigned long end; |
| 728 | int scnt; |
| 729 | unsigned long csum; |
| 730 | struct header hdr; |
| 731 | |
| 732 | drive&=3; |
| 733 | raw = (long) raw_buf; |
| 734 | end = raw + unit[drive].type->read_size; |
| 735 | |
| 736 | for (scnt = 0;scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) { |
| 737 | if (!(raw = scan_sync(raw, end))) { |
| 738 | printk (KERN_INFO "can't find sync for sector %d\n", scnt); |
| 739 | return MFM_NOSYNC; |
| 740 | } |
| 741 | |
| 742 | raw = decode ((ulong *)&hdr.magic, (ulong *)raw, 4); |
| 743 | raw = decode ((ulong *)&hdr.labels, (ulong *)raw, 16); |
| 744 | raw = decode ((ulong *)&hdr.hdrchk, (ulong *)raw, 4); |
| 745 | raw = decode ((ulong *)&hdr.datachk, (ulong *)raw, 4); |
| 746 | csum = checksum((ulong *)&hdr, |
| 747 | (char *)&hdr.hdrchk-(char *)&hdr); |
| 748 | |
| 749 | #ifdef DEBUG |
| 750 | printk ("(%x,%d,%d,%d) (%lx,%lx,%lx,%lx) %lx %lx\n", |
| 751 | hdr.magic, hdr.track, hdr.sect, hdr.ord, |
| 752 | *(ulong *)&hdr.labels[0], *(ulong *)&hdr.labels[4], |
| 753 | *(ulong *)&hdr.labels[8], *(ulong *)&hdr.labels[12], |
| 754 | hdr.hdrchk, hdr.datachk); |
| 755 | #endif |
| 756 | |
| 757 | if (hdr.hdrchk != csum) { |
| 758 | printk(KERN_INFO "MFM_HEADER: %08lx,%08lx\n", hdr.hdrchk, csum); |
| 759 | return MFM_HEADER; |
| 760 | } |
| 761 | |
| 762 | /* verify track */ |
| 763 | if (hdr.track != unit[drive].track) { |
| 764 | printk(KERN_INFO "MFM_TRACK: %d, %d\n", hdr.track, unit[drive].track); |
| 765 | return MFM_TRACK; |
| 766 | } |
| 767 | |
| 768 | raw = decode ((ulong *)(unit[drive].trackbuf + hdr.sect*512), |
| 769 | (ulong *)raw, 512); |
| 770 | csum = checksum((ulong *)(unit[drive].trackbuf + hdr.sect*512), 512); |
| 771 | |
| 772 | if (hdr.datachk != csum) { |
| 773 | printk(KERN_INFO "MFM_DATA: (%x:%d:%d:%d) sc=%d %lx, %lx\n", |
| 774 | hdr.magic, hdr.track, hdr.sect, hdr.ord, scnt, |
| 775 | hdr.datachk, csum); |
| 776 | printk (KERN_INFO "data=(%lx,%lx,%lx,%lx)\n", |
| 777 | ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[0], |
| 778 | ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[1], |
| 779 | ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[2], |
| 780 | ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[3]); |
| 781 | return MFM_DATA; |
| 782 | } |
| 783 | } |
| 784 | |
| 785 | return 0; |
| 786 | } |
| 787 | |
| 788 | static void encode(unsigned long data, unsigned long *dest) |
| 789 | { |
| 790 | unsigned long data2; |
| 791 | |
| 792 | data &= 0x55555555; |
| 793 | data2 = data ^ 0x55555555; |
| 794 | data |= ((data2 >> 1) | 0x80000000) & (data2 << 1); |
| 795 | |
| 796 | if (*(dest - 1) & 0x00000001) |
| 797 | data &= 0x7FFFFFFF; |
| 798 | |
| 799 | *dest = data; |
| 800 | } |
| 801 | |
| 802 | static void encode_block(unsigned long *dest, unsigned long *src, int len) |
| 803 | { |
| 804 | int cnt, to_cnt = 0; |
| 805 | unsigned long data; |
| 806 | |
| 807 | /* odd bits */ |
| 808 | for (cnt = 0; cnt < len / 4; cnt++) { |
| 809 | data = src[cnt] >> 1; |
| 810 | encode(data, dest + to_cnt++); |
| 811 | } |
| 812 | |
| 813 | /* even bits */ |
| 814 | for (cnt = 0; cnt < len / 4; cnt++) { |
| 815 | data = src[cnt]; |
| 816 | encode(data, dest + to_cnt++); |
| 817 | } |
| 818 | } |
| 819 | |
| 820 | static unsigned long *putsec(int disk, unsigned long *raw, int cnt) |
| 821 | { |
| 822 | struct header hdr; |
| 823 | int i; |
| 824 | |
| 825 | disk&=3; |
| 826 | *raw = (raw[-1]&1) ? 0x2AAAAAAA : 0xAAAAAAAA; |
| 827 | raw++; |
| 828 | *raw++ = 0x44894489; |
| 829 | |
| 830 | hdr.magic = 0xFF; |
| 831 | hdr.track = unit[disk].track; |
| 832 | hdr.sect = cnt; |
| 833 | hdr.ord = unit[disk].dtype->sects * unit[disk].type->sect_mult - cnt; |
| 834 | for (i = 0; i < 16; i++) |
| 835 | hdr.labels[i] = 0; |
| 836 | hdr.hdrchk = checksum((ulong *)&hdr, |
| 837 | (char *)&hdr.hdrchk-(char *)&hdr); |
| 838 | hdr.datachk = checksum((ulong *)(unit[disk].trackbuf+cnt*512), 512); |
| 839 | |
| 840 | encode_block(raw, (ulong *)&hdr.magic, 4); |
| 841 | raw += 2; |
| 842 | encode_block(raw, (ulong *)&hdr.labels, 16); |
| 843 | raw += 8; |
| 844 | encode_block(raw, (ulong *)&hdr.hdrchk, 4); |
| 845 | raw += 2; |
| 846 | encode_block(raw, (ulong *)&hdr.datachk, 4); |
| 847 | raw += 2; |
| 848 | encode_block(raw, (ulong *)(unit[disk].trackbuf+cnt*512), 512); |
| 849 | raw += 256; |
| 850 | |
| 851 | return raw; |
| 852 | } |
| 853 | |
| 854 | static void amiga_write(int disk) |
| 855 | { |
| 856 | unsigned int cnt; |
| 857 | unsigned long *ptr = (unsigned long *)raw_buf; |
| 858 | |
| 859 | disk&=3; |
| 860 | /* gap space */ |
| 861 | for (cnt = 0; cnt < 415 * unit[disk].type->sect_mult; cnt++) |
| 862 | *ptr++ = 0xaaaaaaaa; |
| 863 | |
| 864 | /* sectors */ |
| 865 | for (cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++) |
| 866 | ptr = putsec (disk, ptr, cnt); |
| 867 | *(ushort *)ptr = (ptr[-1]&1) ? 0x2AA8 : 0xAAA8; |
| 868 | } |
| 869 | |
| 870 | |
| 871 | struct dos_header { |
| 872 | unsigned char track, /* 0-80 */ |
| 873 | side, /* 0-1 */ |
| 874 | sec, /* 0-...*/ |
| 875 | len_desc;/* 2 */ |
| 876 | unsigned short crc; /* on 68000 we got an alignment problem, |
| 877 | but this compiler solves it by adding silently |
| 878 | adding a pad byte so data won't fit |
| 879 | and this took about 3h to discover.... */ |
| 880 | unsigned char gap1[22]; /* for longword-alignedness (0x4e) */ |
| 881 | }; |
| 882 | |
| 883 | /* crc routines are borrowed from the messydos-handler */ |
| 884 | |
| 885 | /* excerpt from the messydos-device |
| 886 | ; The CRC is computed not only over the actual data, but including |
| 887 | ; the SYNC mark (3 * $a1) and the 'ID/DATA - Address Mark' ($fe/$fb). |
| 888 | ; As we don't read or encode these fields into our buffers, we have to |
| 889 | ; preload the registers containing the CRC with the values they would have |
| 890 | ; after stepping over these fields. |
| 891 | ; |
| 892 | ; How CRCs "really" work: |
| 893 | ; |
| 894 | ; First, you should regard a bitstring as a series of coefficients of |
| 895 | ; polynomials. We calculate with these polynomials in modulo-2 |
| 896 | ; arithmetic, in which both add and subtract are done the same as |
| 897 | ; exclusive-or. Now, we modify our data (a very long polynomial) in |
| 898 | ; such a way that it becomes divisible by the CCITT-standard 16-bit |
| 899 | ; 16 12 5 |
| 900 | ; polynomial: x + x + x + 1, represented by $11021. The easiest |
| 901 | ; way to do this would be to multiply (using proper arithmetic) our |
| 902 | ; datablock with $11021. So we have: |
| 903 | ; data * $11021 = |
| 904 | ; data * ($10000 + $1021) = |
| 905 | ; data * $10000 + data * $1021 |
| 906 | ; The left part of this is simple: Just add two 0 bytes. But then |
| 907 | ; the right part (data $1021) remains difficult and even could have |
| 908 | ; a carry into the left part. The solution is to use a modified |
| 909 | ; multiplication, which has a result that is not correct, but with |
| 910 | ; a difference of any multiple of $11021. We then only need to keep |
| 911 | ; the 16 least significant bits of the result. |
| 912 | ; |
| 913 | ; The following algorithm does this for us: |
| 914 | ; |
| 915 | ; unsigned char *data, c, crclo, crchi; |
| 916 | ; while (not done) { |
| 917 | ; c = *data++ + crchi; |
| 918 | ; crchi = (@ c) >> 8 + crclo; |
| 919 | ; crclo = @ c; |
| 920 | ; } |
| 921 | ; |
| 922 | ; Remember, + is done with EOR, the @ operator is in two tables (high |
| 923 | ; and low byte separately), which is calculated as |
| 924 | ; |
| 925 | ; $1021 * (c & $F0) |
| 926 | ; xor $1021 * (c & $0F) |
| 927 | ; xor $1021 * (c >> 4) (* is regular multiplication) |
| 928 | ; |
| 929 | ; |
| 930 | ; Anyway, the end result is the same as the remainder of the division of |
| 931 | ; the data by $11021. I am afraid I need to study theory a bit more... |
| 932 | |
| 933 | |
| 934 | my only works was to code this from manx to C.... |
| 935 | |
| 936 | */ |
| 937 | |
| 938 | static ushort dos_crc(void * data_a3, int data_d0, int data_d1, int data_d3) |
| 939 | { |
| 940 | static unsigned char CRCTable1[] = { |
| 941 | 0x00,0x10,0x20,0x30,0x40,0x50,0x60,0x70,0x81,0x91,0xa1,0xb1,0xc1,0xd1,0xe1,0xf1, |
| 942 | 0x12,0x02,0x32,0x22,0x52,0x42,0x72,0x62,0x93,0x83,0xb3,0xa3,0xd3,0xc3,0xf3,0xe3, |
| 943 | 0x24,0x34,0x04,0x14,0x64,0x74,0x44,0x54,0xa5,0xb5,0x85,0x95,0xe5,0xf5,0xc5,0xd5, |
| 944 | 0x36,0x26,0x16,0x06,0x76,0x66,0x56,0x46,0xb7,0xa7,0x97,0x87,0xf7,0xe7,0xd7,0xc7, |
| 945 | 0x48,0x58,0x68,0x78,0x08,0x18,0x28,0x38,0xc9,0xd9,0xe9,0xf9,0x89,0x99,0xa9,0xb9, |
| 946 | 0x5a,0x4a,0x7a,0x6a,0x1a,0x0a,0x3a,0x2a,0xdb,0xcb,0xfb,0xeb,0x9b,0x8b,0xbb,0xab, |
| 947 | 0x6c,0x7c,0x4c,0x5c,0x2c,0x3c,0x0c,0x1c,0xed,0xfd,0xcd,0xdd,0xad,0xbd,0x8d,0x9d, |
| 948 | 0x7e,0x6e,0x5e,0x4e,0x3e,0x2e,0x1e,0x0e,0xff,0xef,0xdf,0xcf,0xbf,0xaf,0x9f,0x8f, |
| 949 | 0x91,0x81,0xb1,0xa1,0xd1,0xc1,0xf1,0xe1,0x10,0x00,0x30,0x20,0x50,0x40,0x70,0x60, |
| 950 | 0x83,0x93,0xa3,0xb3,0xc3,0xd3,0xe3,0xf3,0x02,0x12,0x22,0x32,0x42,0x52,0x62,0x72, |
| 951 | 0xb5,0xa5,0x95,0x85,0xf5,0xe5,0xd5,0xc5,0x34,0x24,0x14,0x04,0x74,0x64,0x54,0x44, |
| 952 | 0xa7,0xb7,0x87,0x97,0xe7,0xf7,0xc7,0xd7,0x26,0x36,0x06,0x16,0x66,0x76,0x46,0x56, |
| 953 | 0xd9,0xc9,0xf9,0xe9,0x99,0x89,0xb9,0xa9,0x58,0x48,0x78,0x68,0x18,0x08,0x38,0x28, |
| 954 | 0xcb,0xdb,0xeb,0xfb,0x8b,0x9b,0xab,0xbb,0x4a,0x5a,0x6a,0x7a,0x0a,0x1a,0x2a,0x3a, |
| 955 | 0xfd,0xed,0xdd,0xcd,0xbd,0xad,0x9d,0x8d,0x7c,0x6c,0x5c,0x4c,0x3c,0x2c,0x1c,0x0c, |
| 956 | 0xef,0xff,0xcf,0xdf,0xaf,0xbf,0x8f,0x9f,0x6e,0x7e,0x4e,0x5e,0x2e,0x3e,0x0e,0x1e |
| 957 | }; |
| 958 | |
| 959 | static unsigned char CRCTable2[] = { |
| 960 | 0x00,0x21,0x42,0x63,0x84,0xa5,0xc6,0xe7,0x08,0x29,0x4a,0x6b,0x8c,0xad,0xce,0xef, |
| 961 | 0x31,0x10,0x73,0x52,0xb5,0x94,0xf7,0xd6,0x39,0x18,0x7b,0x5a,0xbd,0x9c,0xff,0xde, |
| 962 | 0x62,0x43,0x20,0x01,0xe6,0xc7,0xa4,0x85,0x6a,0x4b,0x28,0x09,0xee,0xcf,0xac,0x8d, |
| 963 | 0x53,0x72,0x11,0x30,0xd7,0xf6,0x95,0xb4,0x5b,0x7a,0x19,0x38,0xdf,0xfe,0x9d,0xbc, |
| 964 | 0xc4,0xe5,0x86,0xa7,0x40,0x61,0x02,0x23,0xcc,0xed,0x8e,0xaf,0x48,0x69,0x0a,0x2b, |
| 965 | 0xf5,0xd4,0xb7,0x96,0x71,0x50,0x33,0x12,0xfd,0xdc,0xbf,0x9e,0x79,0x58,0x3b,0x1a, |
| 966 | 0xa6,0x87,0xe4,0xc5,0x22,0x03,0x60,0x41,0xae,0x8f,0xec,0xcd,0x2a,0x0b,0x68,0x49, |
| 967 | 0x97,0xb6,0xd5,0xf4,0x13,0x32,0x51,0x70,0x9f,0xbe,0xdd,0xfc,0x1b,0x3a,0x59,0x78, |
| 968 | 0x88,0xa9,0xca,0xeb,0x0c,0x2d,0x4e,0x6f,0x80,0xa1,0xc2,0xe3,0x04,0x25,0x46,0x67, |
| 969 | 0xb9,0x98,0xfb,0xda,0x3d,0x1c,0x7f,0x5e,0xb1,0x90,0xf3,0xd2,0x35,0x14,0x77,0x56, |
| 970 | 0xea,0xcb,0xa8,0x89,0x6e,0x4f,0x2c,0x0d,0xe2,0xc3,0xa0,0x81,0x66,0x47,0x24,0x05, |
| 971 | 0xdb,0xfa,0x99,0xb8,0x5f,0x7e,0x1d,0x3c,0xd3,0xf2,0x91,0xb0,0x57,0x76,0x15,0x34, |
| 972 | 0x4c,0x6d,0x0e,0x2f,0xc8,0xe9,0x8a,0xab,0x44,0x65,0x06,0x27,0xc0,0xe1,0x82,0xa3, |
| 973 | 0x7d,0x5c,0x3f,0x1e,0xf9,0xd8,0xbb,0x9a,0x75,0x54,0x37,0x16,0xf1,0xd0,0xb3,0x92, |
| 974 | 0x2e,0x0f,0x6c,0x4d,0xaa,0x8b,0xe8,0xc9,0x26,0x07,0x64,0x45,0xa2,0x83,0xe0,0xc1, |
| 975 | 0x1f,0x3e,0x5d,0x7c,0x9b,0xba,0xd9,0xf8,0x17,0x36,0x55,0x74,0x93,0xb2,0xd1,0xf0 |
| 976 | }; |
| 977 | |
| 978 | /* look at the asm-code - what looks in C a bit strange is almost as good as handmade */ |
| 979 | register int i; |
| 980 | register unsigned char *CRCT1, *CRCT2, *data, c, crch, crcl; |
| 981 | |
| 982 | CRCT1=CRCTable1; |
| 983 | CRCT2=CRCTable2; |
| 984 | data=data_a3; |
| 985 | crcl=data_d1; |
| 986 | crch=data_d0; |
| 987 | for (i=data_d3; i>=0; i--) { |
| 988 | c = (*data++) ^ crch; |
| 989 | crch = CRCT1[c] ^ crcl; |
| 990 | crcl = CRCT2[c]; |
| 991 | } |
| 992 | return (crch<<8)|crcl; |
| 993 | } |
| 994 | |
| 995 | static inline ushort dos_hdr_crc (struct dos_header *hdr) |
| 996 | { |
| 997 | return dos_crc(&(hdr->track), 0xb2, 0x30, 3); /* precomputed magic */ |
| 998 | } |
| 999 | |
| 1000 | static inline ushort dos_data_crc(unsigned char *data) |
| 1001 | { |
| 1002 | return dos_crc(data, 0xe2, 0x95 ,511); /* precomputed magic */ |
| 1003 | } |
| 1004 | |
| 1005 | static inline unsigned char dos_decode_byte(ushort word) |
| 1006 | { |
| 1007 | register ushort w2; |
| 1008 | register unsigned char byte; |
| 1009 | register unsigned char *dec = mfmdecode; |
| 1010 | |
| 1011 | w2=word; |
| 1012 | w2>>=8; |
| 1013 | w2&=127; |
| 1014 | byte = dec[w2]; |
| 1015 | byte <<= 4; |
| 1016 | w2 = word & 127; |
| 1017 | byte |= dec[w2]; |
| 1018 | return byte; |
| 1019 | } |
| 1020 | |
| 1021 | static unsigned long dos_decode(unsigned char *data, unsigned short *raw, int len) |
| 1022 | { |
| 1023 | int i; |
| 1024 | |
| 1025 | for (i = 0; i < len; i++) |
| 1026 | *data++=dos_decode_byte(*raw++); |
| 1027 | return ((ulong)raw); |
| 1028 | } |
| 1029 | |
| 1030 | #ifdef DEBUG |
| 1031 | static void dbg(unsigned long ptr) |
| 1032 | { |
| 1033 | printk("raw data @%08lx: %08lx, %08lx ,%08lx, %08lx\n", ptr, |
| 1034 | ((ulong *)ptr)[0], ((ulong *)ptr)[1], |
| 1035 | ((ulong *)ptr)[2], ((ulong *)ptr)[3]); |
| 1036 | } |
| 1037 | #endif |
| 1038 | |
| 1039 | static int dos_read(int drive) |
| 1040 | { |
| 1041 | unsigned long end; |
| 1042 | unsigned long raw; |
| 1043 | int scnt; |
| 1044 | unsigned short crc,data_crc[2]; |
| 1045 | struct dos_header hdr; |
| 1046 | |
| 1047 | drive&=3; |
| 1048 | raw = (long) raw_buf; |
| 1049 | end = raw + unit[drive].type->read_size; |
| 1050 | |
| 1051 | for (scnt=0; scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) { |
| 1052 | do { /* search for the right sync of each sec-hdr */ |
| 1053 | if (!(raw = scan_sync (raw, end))) { |
| 1054 | printk(KERN_INFO "dos_read: no hdr sync on " |
| 1055 | "track %d, unit %d for sector %d\n", |
| 1056 | unit[drive].track,drive,scnt); |
| 1057 | return MFM_NOSYNC; |
| 1058 | } |
| 1059 | #ifdef DEBUG |
| 1060 | dbg(raw); |
| 1061 | #endif |
| 1062 | } while (*((ushort *)raw)!=0x5554); /* loop usually only once done */ |
| 1063 | raw+=2; /* skip over headermark */ |
| 1064 | raw = dos_decode((unsigned char *)&hdr,(ushort *) raw,8); |
| 1065 | crc = dos_hdr_crc(&hdr); |
| 1066 | |
| 1067 | #ifdef DEBUG |
| 1068 | printk("(%3d,%d,%2d,%d) %x\n", hdr.track, hdr.side, |
| 1069 | hdr.sec, hdr.len_desc, hdr.crc); |
| 1070 | #endif |
| 1071 | |
| 1072 | if (crc != hdr.crc) { |
| 1073 | printk(KERN_INFO "dos_read: MFM_HEADER %04x,%04x\n", |
| 1074 | hdr.crc, crc); |
| 1075 | return MFM_HEADER; |
| 1076 | } |
| 1077 | if (hdr.track != unit[drive].track/unit[drive].type->heads) { |
| 1078 | printk(KERN_INFO "dos_read: MFM_TRACK %d, %d\n", |
| 1079 | hdr.track, |
| 1080 | unit[drive].track/unit[drive].type->heads); |
| 1081 | return MFM_TRACK; |
| 1082 | } |
| 1083 | |
| 1084 | if (hdr.side != unit[drive].track%unit[drive].type->heads) { |
| 1085 | printk(KERN_INFO "dos_read: MFM_SIDE %d, %d\n", |
| 1086 | hdr.side, |
| 1087 | unit[drive].track%unit[drive].type->heads); |
| 1088 | return MFM_TRACK; |
| 1089 | } |
| 1090 | |
| 1091 | if (hdr.len_desc != 2) { |
| 1092 | printk(KERN_INFO "dos_read: unknown sector len " |
| 1093 | "descriptor %d\n", hdr.len_desc); |
| 1094 | return MFM_DATA; |
| 1095 | } |
| 1096 | #ifdef DEBUG |
| 1097 | printk("hdr accepted\n"); |
| 1098 | #endif |
| 1099 | if (!(raw = scan_sync (raw, end))) { |
| 1100 | printk(KERN_INFO "dos_read: no data sync on track " |
| 1101 | "%d, unit %d for sector%d, disk sector %d\n", |
| 1102 | unit[drive].track, drive, scnt, hdr.sec); |
| 1103 | return MFM_NOSYNC; |
| 1104 | } |
| 1105 | #ifdef DEBUG |
| 1106 | dbg(raw); |
| 1107 | #endif |
| 1108 | |
| 1109 | if (*((ushort *)raw)!=0x5545) { |
| 1110 | printk(KERN_INFO "dos_read: no data mark after " |
| 1111 | "sync (%d,%d,%d,%d) sc=%d\n", |
| 1112 | hdr.track,hdr.side,hdr.sec,hdr.len_desc,scnt); |
| 1113 | return MFM_NOSYNC; |
| 1114 | } |
| 1115 | |
| 1116 | raw+=2; /* skip data mark (included in checksum) */ |
| 1117 | raw = dos_decode((unsigned char *)(unit[drive].trackbuf + (hdr.sec - 1) * 512), (ushort *) raw, 512); |
| 1118 | raw = dos_decode((unsigned char *)data_crc,(ushort *) raw,4); |
| 1119 | crc = dos_data_crc(unit[drive].trackbuf + (hdr.sec - 1) * 512); |
| 1120 | |
| 1121 | if (crc != data_crc[0]) { |
| 1122 | printk(KERN_INFO "dos_read: MFM_DATA (%d,%d,%d,%d) " |
| 1123 | "sc=%d, %x %x\n", hdr.track, hdr.side, |
| 1124 | hdr.sec, hdr.len_desc, scnt,data_crc[0], crc); |
| 1125 | printk(KERN_INFO "data=(%lx,%lx,%lx,%lx,...)\n", |
| 1126 | ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[0], |
| 1127 | ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[1], |
| 1128 | ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[2], |
| 1129 | ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[3]); |
| 1130 | return MFM_DATA; |
| 1131 | } |
| 1132 | } |
| 1133 | return 0; |
| 1134 | } |
| 1135 | |
| 1136 | static inline ushort dos_encode_byte(unsigned char byte) |
| 1137 | { |
| 1138 | register unsigned char *enc, b2, b1; |
| 1139 | register ushort word; |
| 1140 | |
| 1141 | enc=mfmencode; |
| 1142 | b1=byte; |
| 1143 | b2=b1>>4; |
| 1144 | b1&=15; |
| 1145 | word=enc[b2] <<8 | enc [b1]; |
| 1146 | return (word|((word&(256|64)) ? 0: 128)); |
| 1147 | } |
| 1148 | |
| 1149 | static void dos_encode_block(ushort *dest, unsigned char *src, int len) |
| 1150 | { |
| 1151 | int i; |
| 1152 | |
| 1153 | for (i = 0; i < len; i++) { |
| 1154 | *dest=dos_encode_byte(*src++); |
| 1155 | *dest|=((dest[-1]&1)||(*dest&0x4000))? 0: 0x8000; |
| 1156 | dest++; |
| 1157 | } |
| 1158 | } |
| 1159 | |
| 1160 | static unsigned long *ms_putsec(int drive, unsigned long *raw, int cnt) |
| 1161 | { |
| 1162 | static struct dos_header hdr={0,0,0,2,0, |
| 1163 | {78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78}}; |
| 1164 | int i; |
| 1165 | static ushort crc[2]={0,0x4e4e}; |
| 1166 | |
| 1167 | drive&=3; |
| 1168 | /* id gap 1 */ |
| 1169 | /* the MFM word before is always 9254 */ |
| 1170 | for(i=0;i<6;i++) |
| 1171 | *raw++=0xaaaaaaaa; |
| 1172 | /* 3 sync + 1 headermark */ |
| 1173 | *raw++=0x44894489; |
| 1174 | *raw++=0x44895554; |
| 1175 | |
| 1176 | /* fill in the variable parts of the header */ |
| 1177 | hdr.track=unit[drive].track/unit[drive].type->heads; |
| 1178 | hdr.side=unit[drive].track%unit[drive].type->heads; |
| 1179 | hdr.sec=cnt+1; |
| 1180 | hdr.crc=dos_hdr_crc(&hdr); |
| 1181 | |
| 1182 | /* header (without "magic") and id gap 2*/ |
| 1183 | dos_encode_block((ushort *)raw,(unsigned char *) &hdr.track,28); |
| 1184 | raw+=14; |
| 1185 | |
| 1186 | /*id gap 3 */ |
| 1187 | for(i=0;i<6;i++) |
| 1188 | *raw++=0xaaaaaaaa; |
| 1189 | |
| 1190 | /* 3 syncs and 1 datamark */ |
| 1191 | *raw++=0x44894489; |
| 1192 | *raw++=0x44895545; |
| 1193 | |
| 1194 | /* data */ |
| 1195 | dos_encode_block((ushort *)raw, |
| 1196 | (unsigned char *)unit[drive].trackbuf+cnt*512,512); |
| 1197 | raw+=256; |
| 1198 | |
| 1199 | /*data crc + jd's special gap (long words :-/) */ |
| 1200 | crc[0]=dos_data_crc(unit[drive].trackbuf+cnt*512); |
| 1201 | dos_encode_block((ushort *) raw,(unsigned char *)crc,4); |
| 1202 | raw+=2; |
| 1203 | |
| 1204 | /* data gap */ |
| 1205 | for(i=0;i<38;i++) |
| 1206 | *raw++=0x92549254; |
| 1207 | |
| 1208 | return raw; /* wrote 652 MFM words */ |
| 1209 | } |
| 1210 | |
| 1211 | static void dos_write(int disk) |
| 1212 | { |
| 1213 | int cnt; |
| 1214 | unsigned long raw = (unsigned long) raw_buf; |
| 1215 | unsigned long *ptr=(unsigned long *)raw; |
| 1216 | |
| 1217 | disk&=3; |
| 1218 | /* really gap4 + indexgap , but we write it first and round it up */ |
| 1219 | for (cnt=0;cnt<425;cnt++) |
| 1220 | *ptr++=0x92549254; |
| 1221 | |
| 1222 | /* the following is just guessed */ |
| 1223 | if (unit[disk].type->sect_mult==2) /* check for HD-Disks */ |
| 1224 | for(cnt=0;cnt<473;cnt++) |
| 1225 | *ptr++=0x92549254; |
| 1226 | |
| 1227 | /* now the index marks...*/ |
| 1228 | for (cnt=0;cnt<20;cnt++) |
| 1229 | *ptr++=0x92549254; |
| 1230 | for (cnt=0;cnt<6;cnt++) |
| 1231 | *ptr++=0xaaaaaaaa; |
| 1232 | *ptr++=0x52245224; |
| 1233 | *ptr++=0x52245552; |
| 1234 | for (cnt=0;cnt<20;cnt++) |
| 1235 | *ptr++=0x92549254; |
| 1236 | |
| 1237 | /* sectors */ |
| 1238 | for(cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++) |
| 1239 | ptr=ms_putsec(disk,ptr,cnt); |
| 1240 | |
| 1241 | *(ushort *)ptr = 0xaaa8; /* MFM word before is always 0x9254 */ |
| 1242 | } |
| 1243 | |
| 1244 | /* |
| 1245 | * Here comes the high level stuff (i.e. the filesystem interface) |
| 1246 | * and helper functions. |
| 1247 | * Normally this should be the only part that has to be adapted to |
| 1248 | * different kernel versions. |
| 1249 | */ |
| 1250 | |
| 1251 | /* FIXME: this assumes the drive is still spinning - |
| 1252 | * which is only true if we complete writing a track within three seconds |
| 1253 | */ |
| 1254 | static void flush_track_callback(unsigned long nr) |
| 1255 | { |
| 1256 | nr&=3; |
| 1257 | writefromint = 1; |
| 1258 | if (!try_fdc(nr)) { |
| 1259 | /* we might block in an interrupt, so try again later */ |
| 1260 | flush_track_timer[nr].expires = jiffies + 1; |
| 1261 | add_timer(flush_track_timer + nr); |
| 1262 | return; |
| 1263 | } |
| 1264 | get_fdc(nr); |
| 1265 | (*unit[nr].dtype->write_fkt)(nr); |
| 1266 | if (!raw_write(nr)) { |
| 1267 | printk (KERN_NOTICE "floppy disk write protected\n"); |
| 1268 | writefromint = 0; |
| 1269 | writepending = 0; |
| 1270 | } |
| 1271 | rel_fdc(); |
| 1272 | } |
| 1273 | |
| 1274 | static int non_int_flush_track (unsigned long nr) |
| 1275 | { |
| 1276 | unsigned long flags; |
| 1277 | |
| 1278 | nr&=3; |
| 1279 | writefromint = 0; |
| 1280 | del_timer(&post_write_timer); |
| 1281 | get_fdc(nr); |
| 1282 | if (!fd_motor_on(nr)) { |
| 1283 | writepending = 0; |
| 1284 | rel_fdc(); |
| 1285 | return 0; |
| 1286 | } |
| 1287 | local_irq_save(flags); |
| 1288 | if (writepending != 2) { |
| 1289 | local_irq_restore(flags); |
| 1290 | (*unit[nr].dtype->write_fkt)(nr); |
| 1291 | if (!raw_write(nr)) { |
| 1292 | printk (KERN_NOTICE "floppy disk write protected " |
| 1293 | "in write!\n"); |
| 1294 | writepending = 0; |
| 1295 | return 0; |
| 1296 | } |
| 1297 | while (block_flag == 2) |
| 1298 | sleep_on (&wait_fd_block); |
| 1299 | } |
| 1300 | else { |
| 1301 | local_irq_restore(flags); |
| 1302 | ms_delay(2); /* 2 ms post_write delay */ |
| 1303 | post_write(nr); |
| 1304 | } |
| 1305 | rel_fdc(); |
| 1306 | return 1; |
| 1307 | } |
| 1308 | |
| 1309 | static int get_track(int drive, int track) |
| 1310 | { |
| 1311 | int error, errcnt; |
| 1312 | |
| 1313 | drive&=3; |
| 1314 | if (unit[drive].track == track) |
| 1315 | return 0; |
| 1316 | get_fdc(drive); |
| 1317 | if (!fd_motor_on(drive)) { |
| 1318 | rel_fdc(); |
| 1319 | return -1; |
| 1320 | } |
| 1321 | |
| 1322 | if (unit[drive].dirty == 1) { |
| 1323 | del_timer (flush_track_timer + drive); |
| 1324 | non_int_flush_track (drive); |
| 1325 | } |
| 1326 | errcnt = 0; |
| 1327 | while (errcnt < MAX_ERRORS) { |
| 1328 | if (!fd_seek(drive, track)) |
| 1329 | return -1; |
| 1330 | raw_read(drive); |
| 1331 | error = (*unit[drive].dtype->read_fkt)(drive); |
| 1332 | if (error == 0) { |
| 1333 | rel_fdc(); |
| 1334 | return 0; |
| 1335 | } |
| 1336 | /* Read Error Handling: recalibrate and try again */ |
| 1337 | unit[drive].track = -1; |
| 1338 | errcnt++; |
| 1339 | } |
| 1340 | rel_fdc(); |
| 1341 | return -1; |
| 1342 | } |
| 1343 | |
| 1344 | static void redo_fd_request(void) |
| 1345 | { |
| 1346 | unsigned int cnt, block, track, sector; |
| 1347 | int drive; |
| 1348 | struct amiga_floppy_struct *floppy; |
| 1349 | char *data; |
| 1350 | unsigned long flags; |
| 1351 | |
| 1352 | repeat: |
| 1353 | if (!CURRENT) { |
| 1354 | /* Nothing left to do */ |
| 1355 | return; |
| 1356 | } |
| 1357 | |
| 1358 | floppy = CURRENT->rq_disk->private_data; |
| 1359 | drive = floppy - unit; |
| 1360 | |
| 1361 | /* Here someone could investigate to be more efficient */ |
| 1362 | for (cnt = 0; cnt < CURRENT->current_nr_sectors; cnt++) { |
| 1363 | #ifdef DEBUG |
| 1364 | printk("fd: sector %ld + %d requested for %s\n", |
| 1365 | CURRENT->sector,cnt, |
| 1366 | (CURRENT->cmd==READ)?"read":"write"); |
| 1367 | #endif |
| 1368 | block = CURRENT->sector + cnt; |
| 1369 | if ((int)block > floppy->blocks) { |
| 1370 | end_request(CURRENT, 0); |
| 1371 | goto repeat; |
| 1372 | } |
| 1373 | |
| 1374 | track = block / (floppy->dtype->sects * floppy->type->sect_mult); |
| 1375 | sector = block % (floppy->dtype->sects * floppy->type->sect_mult); |
| 1376 | data = CURRENT->buffer + 512 * cnt; |
| 1377 | #ifdef DEBUG |
| 1378 | printk("access to track %d, sector %d, with buffer at " |
| 1379 | "0x%08lx\n", track, sector, data); |
| 1380 | #endif |
| 1381 | |
| 1382 | if ((rq_data_dir(CURRENT) != READ) && (rq_data_dir(CURRENT) != WRITE)) { |
| 1383 | printk(KERN_WARNING "do_fd_request: unknown command\n"); |
| 1384 | end_request(CURRENT, 0); |
| 1385 | goto repeat; |
| 1386 | } |
| 1387 | if (get_track(drive, track) == -1) { |
| 1388 | end_request(CURRENT, 0); |
| 1389 | goto repeat; |
| 1390 | } |
| 1391 | |
| 1392 | switch (rq_data_dir(CURRENT)) { |
| 1393 | case READ: |
| 1394 | memcpy(data, floppy->trackbuf + sector * 512, 512); |
| 1395 | break; |
| 1396 | |
| 1397 | case WRITE: |
| 1398 | memcpy(floppy->trackbuf + sector * 512, data, 512); |
| 1399 | |
| 1400 | /* keep the drive spinning while writes are scheduled */ |
| 1401 | if (!fd_motor_on(drive)) { |
| 1402 | end_request(CURRENT, 0); |
| 1403 | goto repeat; |
| 1404 | } |
| 1405 | /* |
| 1406 | * setup a callback to write the track buffer |
| 1407 | * after a short (1 tick) delay. |
| 1408 | */ |
| 1409 | local_irq_save(flags); |
| 1410 | |
| 1411 | floppy->dirty = 1; |
| 1412 | /* reset the timer */ |
| 1413 | mod_timer (flush_track_timer + drive, jiffies + 1); |
| 1414 | local_irq_restore(flags); |
| 1415 | break; |
| 1416 | } |
| 1417 | } |
| 1418 | CURRENT->nr_sectors -= CURRENT->current_nr_sectors; |
| 1419 | CURRENT->sector += CURRENT->current_nr_sectors; |
| 1420 | |
| 1421 | end_request(CURRENT, 1); |
| 1422 | goto repeat; |
| 1423 | } |
| 1424 | |
| 1425 | static void do_fd_request(request_queue_t * q) |
| 1426 | { |
| 1427 | redo_fd_request(); |
| 1428 | } |
| 1429 | |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 1430 | static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
| 1431 | { |
| 1432 | int drive = MINOR(bdev->bd_dev) & 3; |
| 1433 | |
| 1434 | geo->heads = unit[drive].type->heads; |
| 1435 | geo->sectors = unit[drive].dtype->sects * unit[drive].type->sect_mult; |
| 1436 | geo->cylinders = unit[drive].type->tracks; |
| 1437 | return 0; |
| 1438 | } |
| 1439 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | static int fd_ioctl(struct inode *inode, struct file *filp, |
| 1441 | unsigned int cmd, unsigned long param) |
| 1442 | { |
| 1443 | int drive = iminor(inode) & 3; |
| 1444 | static struct floppy_struct getprm; |
Al Viro | 8a423e5 | 2006-01-12 01:06:28 -0800 | [diff] [blame] | 1445 | void __user *argp = (void __user *)param; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1446 | |
| 1447 | switch(cmd){ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1448 | case FDFMTBEG: |
| 1449 | get_fdc(drive); |
| 1450 | if (fd_ref[drive] > 1) { |
| 1451 | rel_fdc(); |
| 1452 | return -EBUSY; |
| 1453 | } |
| 1454 | fsync_bdev(inode->i_bdev); |
| 1455 | if (fd_motor_on(drive) == 0) { |
| 1456 | rel_fdc(); |
| 1457 | return -ENODEV; |
| 1458 | } |
| 1459 | if (fd_calibrate(drive) == 0) { |
| 1460 | rel_fdc(); |
| 1461 | return -ENXIO; |
| 1462 | } |
| 1463 | floppy_off(drive); |
| 1464 | rel_fdc(); |
| 1465 | break; |
| 1466 | case FDFMTTRK: |
| 1467 | if (param < unit[drive].type->tracks * unit[drive].type->heads) |
| 1468 | { |
| 1469 | get_fdc(drive); |
| 1470 | if (fd_seek(drive,param) != 0){ |
| 1471 | memset(unit[drive].trackbuf, FD_FILL_BYTE, |
| 1472 | unit[drive].dtype->sects * unit[drive].type->sect_mult * 512); |
| 1473 | non_int_flush_track(drive); |
| 1474 | } |
| 1475 | floppy_off(drive); |
| 1476 | rel_fdc(); |
| 1477 | } |
| 1478 | else |
| 1479 | return -EINVAL; |
| 1480 | break; |
| 1481 | case FDFMTEND: |
| 1482 | floppy_off(drive); |
| 1483 | invalidate_bdev(inode->i_bdev, 0); |
| 1484 | break; |
| 1485 | case FDGETPRM: |
| 1486 | memset((void *)&getprm, 0, sizeof (getprm)); |
| 1487 | getprm.track=unit[drive].type->tracks; |
| 1488 | getprm.head=unit[drive].type->heads; |
| 1489 | getprm.sect=unit[drive].dtype->sects * unit[drive].type->sect_mult; |
| 1490 | getprm.size=unit[drive].blocks; |
Al Viro | 8a423e5 | 2006-01-12 01:06:28 -0800 | [diff] [blame] | 1491 | if (copy_to_user(argp, &getprm, sizeof(struct floppy_struct))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | return -EFAULT; |
| 1493 | break; |
| 1494 | case FDSETPRM: |
| 1495 | case FDDEFPRM: |
| 1496 | return -EINVAL; |
| 1497 | case FDFLUSH: /* unconditionally, even if not needed */ |
| 1498 | del_timer (flush_track_timer + drive); |
| 1499 | non_int_flush_track(drive); |
| 1500 | break; |
| 1501 | #ifdef RAW_IOCTL |
| 1502 | case IOCTL_RAW_TRACK: |
Al Viro | 8a423e5 | 2006-01-12 01:06:28 -0800 | [diff] [blame] | 1503 | if (copy_to_user(argp, raw_buf, unit[drive].type->read_size)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1504 | return -EFAULT; |
| 1505 | else |
| 1506 | return unit[drive].type->read_size; |
| 1507 | #endif |
| 1508 | default: |
| 1509 | printk(KERN_DEBUG "fd_ioctl: unknown cmd %d for drive %d.", |
| 1510 | cmd, drive); |
| 1511 | return -ENOSYS; |
| 1512 | } |
| 1513 | return 0; |
| 1514 | } |
| 1515 | |
| 1516 | static void fd_probe(int dev) |
| 1517 | { |
| 1518 | unsigned long code; |
| 1519 | int type; |
| 1520 | int drive; |
| 1521 | |
| 1522 | drive = dev & 3; |
| 1523 | code = fd_get_drive_id(drive); |
| 1524 | |
| 1525 | /* get drive type */ |
| 1526 | for (type = 0; type < num_dr_types; type++) |
| 1527 | if (drive_types[type].code == code) |
| 1528 | break; |
| 1529 | |
| 1530 | if (type >= num_dr_types) { |
| 1531 | printk(KERN_WARNING "fd_probe: unsupported drive type " |
| 1532 | "%08lx found\n", code); |
| 1533 | unit[drive].type = &drive_types[num_dr_types-1]; /* FD_NODRIVE */ |
| 1534 | return; |
| 1535 | } |
| 1536 | |
| 1537 | unit[drive].type = drive_types + type; |
| 1538 | unit[drive].track = -1; |
| 1539 | |
| 1540 | unit[drive].disk = -1; |
| 1541 | unit[drive].motor = 0; |
| 1542 | unit[drive].busy = 0; |
| 1543 | unit[drive].status = -1; |
| 1544 | } |
| 1545 | |
| 1546 | /* |
| 1547 | * floppy_open check for aliasing (/dev/fd0 can be the same as |
| 1548 | * /dev/PS0 etc), and disallows simultaneous access to the same |
| 1549 | * drive with different device numbers. |
| 1550 | */ |
| 1551 | static int floppy_open(struct inode *inode, struct file *filp) |
| 1552 | { |
| 1553 | int drive = iminor(inode) & 3; |
| 1554 | int system = (iminor(inode) & 4) >> 2; |
| 1555 | int old_dev; |
| 1556 | unsigned long flags; |
| 1557 | |
| 1558 | old_dev = fd_device[drive]; |
| 1559 | |
| 1560 | if (fd_ref[drive] && old_dev != system) |
| 1561 | return -EBUSY; |
| 1562 | |
| 1563 | if (filp && filp->f_mode & 3) { |
| 1564 | check_disk_change(inode->i_bdev); |
| 1565 | if (filp->f_mode & 2 ) { |
| 1566 | int wrprot; |
| 1567 | |
| 1568 | get_fdc(drive); |
| 1569 | fd_select (drive); |
| 1570 | wrprot = !(ciaa.pra & DSKPROT); |
| 1571 | fd_deselect (drive); |
| 1572 | rel_fdc(); |
| 1573 | |
| 1574 | if (wrprot) |
| 1575 | return -EROFS; |
| 1576 | } |
| 1577 | } |
| 1578 | |
| 1579 | local_irq_save(flags); |
| 1580 | fd_ref[drive]++; |
| 1581 | fd_device[drive] = system; |
| 1582 | local_irq_restore(flags); |
| 1583 | |
| 1584 | unit[drive].dtype=&data_types[system]; |
| 1585 | unit[drive].blocks=unit[drive].type->heads*unit[drive].type->tracks* |
| 1586 | data_types[system].sects*unit[drive].type->sect_mult; |
| 1587 | set_capacity(unit[drive].gendisk, unit[drive].blocks); |
| 1588 | |
| 1589 | printk(KERN_INFO "fd%d: accessing %s-disk with %s-layout\n",drive, |
| 1590 | unit[drive].type->name, data_types[system].name); |
| 1591 | |
| 1592 | return 0; |
| 1593 | } |
| 1594 | |
| 1595 | static int floppy_release(struct inode * inode, struct file * filp) |
| 1596 | { |
| 1597 | int drive = iminor(inode) & 3; |
| 1598 | |
| 1599 | if (unit[drive].dirty == 1) { |
| 1600 | del_timer (flush_track_timer + drive); |
| 1601 | non_int_flush_track (drive); |
| 1602 | } |
| 1603 | |
| 1604 | if (!fd_ref[drive]--) { |
| 1605 | printk(KERN_CRIT "floppy_release with fd_ref == 0"); |
| 1606 | fd_ref[drive] = 0; |
| 1607 | } |
| 1608 | #ifdef MODULE |
| 1609 | /* the mod_use counter is handled this way */ |
| 1610 | floppy_off (drive | 0x40000000); |
| 1611 | #endif |
| 1612 | return 0; |
| 1613 | } |
| 1614 | |
| 1615 | /* |
| 1616 | * floppy-change is never called from an interrupt, so we can relax a bit |
| 1617 | * here, sleep etc. Note that floppy-on tries to set current_DOR to point |
| 1618 | * to the desired drive, but it will probably not survive the sleep if |
| 1619 | * several floppies are used at the same time: thus the loop. |
| 1620 | */ |
| 1621 | static int amiga_floppy_change(struct gendisk *disk) |
| 1622 | { |
| 1623 | struct amiga_floppy_struct *p = disk->private_data; |
| 1624 | int drive = p - unit; |
| 1625 | int changed; |
| 1626 | static int first_time = 1; |
| 1627 | |
| 1628 | if (first_time) |
| 1629 | changed = first_time--; |
| 1630 | else { |
| 1631 | get_fdc(drive); |
| 1632 | fd_select (drive); |
| 1633 | changed = !(ciaa.pra & DSKCHANGE); |
| 1634 | fd_deselect (drive); |
| 1635 | rel_fdc(); |
| 1636 | } |
| 1637 | |
| 1638 | if (changed) { |
| 1639 | fd_probe(drive); |
| 1640 | p->track = -1; |
| 1641 | p->dirty = 0; |
| 1642 | writepending = 0; /* if this was true before, too bad! */ |
| 1643 | writefromint = 0; |
| 1644 | return 1; |
| 1645 | } |
| 1646 | return 0; |
| 1647 | } |
| 1648 | |
| 1649 | static struct block_device_operations floppy_fops = { |
| 1650 | .owner = THIS_MODULE, |
| 1651 | .open = floppy_open, |
| 1652 | .release = floppy_release, |
| 1653 | .ioctl = fd_ioctl, |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 1654 | .getgeo = fd_getgeo, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1655 | .media_changed = amiga_floppy_change, |
| 1656 | }; |
| 1657 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1658 | static int __init fd_probe_drives(void) |
| 1659 | { |
| 1660 | int drive,drives,nomem; |
| 1661 | |
| 1662 | printk(KERN_INFO "FD: probing units\n" KERN_INFO "found "); |
| 1663 | drives=0; |
| 1664 | nomem=0; |
| 1665 | for(drive=0;drive<FD_MAX_UNITS;drive++) { |
| 1666 | struct gendisk *disk; |
| 1667 | fd_probe(drive); |
| 1668 | if (unit[drive].type->code == FD_NODRIVE) |
| 1669 | continue; |
| 1670 | disk = alloc_disk(1); |
| 1671 | if (!disk) { |
| 1672 | unit[drive].type->code = FD_NODRIVE; |
| 1673 | continue; |
| 1674 | } |
| 1675 | unit[drive].gendisk = disk; |
| 1676 | drives++; |
| 1677 | if ((unit[drive].trackbuf = kmalloc(FLOPPY_MAX_SECTORS * 512, GFP_KERNEL)) == NULL) { |
| 1678 | printk("no mem for "); |
| 1679 | unit[drive].type = &drive_types[num_dr_types - 1]; /* FD_NODRIVE */ |
| 1680 | drives--; |
| 1681 | nomem = 1; |
| 1682 | } |
| 1683 | printk("fd%d ",drive); |
| 1684 | disk->major = FLOPPY_MAJOR; |
| 1685 | disk->first_minor = drive; |
| 1686 | disk->fops = &floppy_fops; |
| 1687 | sprintf(disk->disk_name, "fd%d", drive); |
| 1688 | disk->private_data = &unit[drive]; |
| 1689 | disk->queue = floppy_queue; |
| 1690 | set_capacity(disk, 880*2); |
| 1691 | add_disk(disk); |
| 1692 | } |
| 1693 | if ((drives > 0) || (nomem == 0)) { |
| 1694 | if (drives == 0) |
| 1695 | printk("no drives"); |
| 1696 | printk("\n"); |
| 1697 | return drives; |
| 1698 | } |
| 1699 | printk("\n"); |
| 1700 | return -ENOMEM; |
| 1701 | } |
| 1702 | |
| 1703 | static struct kobject *floppy_find(dev_t dev, int *part, void *data) |
| 1704 | { |
| 1705 | int drive = *part & 3; |
| 1706 | if (unit[drive].type->code == FD_NODRIVE) |
| 1707 | return NULL; |
| 1708 | *part = 0; |
| 1709 | return get_disk(unit[drive].gendisk); |
| 1710 | } |
| 1711 | |
| 1712 | int __init amiga_floppy_init(void) |
| 1713 | { |
| 1714 | int i, ret; |
| 1715 | |
| 1716 | if (!AMIGAHW_PRESENT(AMI_FLOPPY)) |
| 1717 | return -ENXIO; |
| 1718 | |
| 1719 | if (register_blkdev(FLOPPY_MAJOR,"fd")) |
| 1720 | return -EBUSY; |
| 1721 | |
| 1722 | /* |
| 1723 | * We request DSKPTR, DSKLEN and DSKDATA only, because the other |
| 1724 | * floppy registers are too spreaded over the custom register space |
| 1725 | */ |
| 1726 | ret = -EBUSY; |
| 1727 | if (!request_mem_region(CUSTOM_PHYSADDR+0x20, 8, "amiflop [Paula]")) { |
| 1728 | printk("fd: cannot get floppy registers\n"); |
| 1729 | goto out_blkdev; |
| 1730 | } |
| 1731 | |
| 1732 | ret = -ENOMEM; |
| 1733 | if ((raw_buf = (char *)amiga_chip_alloc (RAW_BUF_SIZE, "Floppy")) == |
| 1734 | NULL) { |
| 1735 | printk("fd: cannot get chip mem buffer\n"); |
| 1736 | goto out_memregion; |
| 1737 | } |
| 1738 | |
| 1739 | ret = -EBUSY; |
| 1740 | if (request_irq(IRQ_AMIGA_DSKBLK, fd_block_done, 0, "floppy_dma", NULL)) { |
| 1741 | printk("fd: cannot get irq for dma\n"); |
| 1742 | goto out_irq; |
| 1743 | } |
| 1744 | |
| 1745 | if (request_irq(IRQ_AMIGA_CIAA_TB, ms_isr, 0, "floppy_timer", NULL)) { |
| 1746 | printk("fd: cannot get irq for timer\n"); |
| 1747 | goto out_irq2; |
| 1748 | } |
| 1749 | |
| 1750 | ret = -ENOMEM; |
| 1751 | floppy_queue = blk_init_queue(do_fd_request, &amiflop_lock); |
| 1752 | if (!floppy_queue) |
| 1753 | goto out_queue; |
| 1754 | |
| 1755 | ret = -ENXIO; |
| 1756 | if (fd_probe_drives() < 1) /* No usable drives */ |
| 1757 | goto out_probe; |
| 1758 | |
| 1759 | blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE, |
| 1760 | floppy_find, NULL, NULL); |
| 1761 | |
| 1762 | /* initialize variables */ |
| 1763 | init_timer(&motor_on_timer); |
| 1764 | motor_on_timer.expires = 0; |
| 1765 | motor_on_timer.data = 0; |
| 1766 | motor_on_timer.function = motor_on_callback; |
| 1767 | for (i = 0; i < FD_MAX_UNITS; i++) { |
| 1768 | init_timer(&motor_off_timer[i]); |
| 1769 | motor_off_timer[i].expires = 0; |
| 1770 | motor_off_timer[i].data = i|0x80000000; |
| 1771 | motor_off_timer[i].function = fd_motor_off; |
| 1772 | init_timer(&flush_track_timer[i]); |
| 1773 | flush_track_timer[i].expires = 0; |
| 1774 | flush_track_timer[i].data = i; |
| 1775 | flush_track_timer[i].function = flush_track_callback; |
| 1776 | |
| 1777 | unit[i].track = -1; |
| 1778 | } |
| 1779 | |
| 1780 | init_timer(&post_write_timer); |
| 1781 | post_write_timer.expires = 0; |
| 1782 | post_write_timer.data = 0; |
| 1783 | post_write_timer.function = post_write; |
| 1784 | |
| 1785 | for (i = 0; i < 128; i++) |
| 1786 | mfmdecode[i]=255; |
| 1787 | for (i = 0; i < 16; i++) |
| 1788 | mfmdecode[mfmencode[i]]=i; |
| 1789 | |
| 1790 | /* make sure that disk DMA is enabled */ |
| 1791 | custom.dmacon = DMAF_SETCLR | DMAF_DISK; |
| 1792 | |
| 1793 | /* init ms timer */ |
| 1794 | ciaa.crb = 8; /* one-shot, stop */ |
| 1795 | return 0; |
| 1796 | |
| 1797 | out_probe: |
| 1798 | blk_cleanup_queue(floppy_queue); |
| 1799 | out_queue: |
| 1800 | free_irq(IRQ_AMIGA_CIAA_TB, NULL); |
| 1801 | out_irq2: |
| 1802 | free_irq(IRQ_AMIGA_DSKBLK, NULL); |
| 1803 | out_irq: |
| 1804 | amiga_chip_free(raw_buf); |
| 1805 | out_memregion: |
| 1806 | release_mem_region(CUSTOM_PHYSADDR+0x20, 8); |
| 1807 | out_blkdev: |
| 1808 | unregister_blkdev(FLOPPY_MAJOR,"fd"); |
| 1809 | return ret; |
| 1810 | } |
| 1811 | |
| 1812 | #ifdef MODULE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1813 | |
| 1814 | int init_module(void) |
| 1815 | { |
| 1816 | if (!MACH_IS_AMIGA) |
| 1817 | return -ENXIO; |
| 1818 | return amiga_floppy_init(); |
| 1819 | } |
| 1820 | |
| 1821 | #if 0 /* not safe to unload */ |
| 1822 | void cleanup_module(void) |
| 1823 | { |
| 1824 | int i; |
| 1825 | |
| 1826 | for( i = 0; i < FD_MAX_UNITS; i++) { |
| 1827 | if (unit[i].type->code != FD_NODRIVE) { |
| 1828 | del_gendisk(unit[i].gendisk); |
| 1829 | put_disk(unit[i].gendisk); |
| 1830 | kfree(unit[i].trackbuf); |
| 1831 | } |
| 1832 | } |
| 1833 | blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256); |
| 1834 | free_irq(IRQ_AMIGA_CIAA_TB, NULL); |
| 1835 | free_irq(IRQ_AMIGA_DSKBLK, NULL); |
| 1836 | custom.dmacon = DMAF_DISK; /* disable DMA */ |
| 1837 | amiga_chip_free(raw_buf); |
| 1838 | blk_cleanup_queue(floppy_queue); |
| 1839 | release_mem_region(CUSTOM_PHYSADDR+0x20, 8); |
| 1840 | unregister_blkdev(FLOPPY_MAJOR, "fd"); |
| 1841 | } |
| 1842 | #endif |
Al Viro | 6390743 | 2006-01-12 01:06:36 -0800 | [diff] [blame] | 1843 | |
| 1844 | #else |
| 1845 | static int __init amiga_floppy_setup (char *str) |
| 1846 | { |
| 1847 | int n; |
| 1848 | if (!MACH_IS_AMIGA) |
| 1849 | return 0; |
| 1850 | if (!get_option(&str, &n)) |
| 1851 | return 0; |
| 1852 | printk (KERN_INFO "amiflop: Setting default df0 to %x\n", n); |
| 1853 | fd_def_df0 = n; |
OGAWA Hirofumi | 9b41046 | 2006-03-31 02:30:33 -0800 | [diff] [blame] | 1854 | return 1; |
Al Viro | 6390743 | 2006-01-12 01:06:36 -0800 | [diff] [blame] | 1855 | } |
| 1856 | |
| 1857 | __setup("floppy=", amiga_floppy_setup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1858 | #endif |