Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/kernel/arch/arm/drivers/block/fd1772.c |
| 3 | * Based on ataflop.c in the m68k Linux |
| 4 | * Copyright (C) 1993 Greg Harp |
| 5 | * Atari Support by Bjoern Brauel, Roman Hodek |
| 6 | * Archimedes Support by Dave Gilbert (linux@treblig.org) |
| 7 | * |
| 8 | * Big cleanup Sep 11..14 1994 Roman Hodek: |
| 9 | * - Driver now works interrupt driven |
| 10 | * - Support for two drives; should work, but I cannot test that :-( |
| 11 | * - Reading is done in whole tracks and buffered to speed up things |
| 12 | * - Disk change detection and drive deselecting after motor-off |
| 13 | * similar to TOS |
| 14 | * - Autodetection of disk format (DD/HD); untested yet, because I |
| 15 | * don't have an HD drive :-( |
| 16 | * |
| 17 | * Fixes Nov 13 1994 Martin Schaller: |
| 18 | * - Autodetection works now |
| 19 | * - Support for 5 1/4" disks |
| 20 | * - Removed drive type (unknown on atari) |
| 21 | * - Do seeks with 8 Mhz |
| 22 | * |
| 23 | * Changes by Andreas Schwab: |
| 24 | * - After errors in multiple read mode try again reading single sectors |
| 25 | * (Feb 1995): |
| 26 | * - Clean up error handling |
| 27 | * - Set blk_size for proper size checking |
| 28 | * - Initialize track register when testing presence of floppy |
| 29 | * - Implement some ioctl's |
| 30 | * |
| 31 | * Changes by Torsten Lang: |
| 32 | * - When probing the floppies we should add the FDC1772CMDADD_H flag since |
| 33 | * the FDC1772 will otherwise wait forever when no disk is inserted... |
| 34 | * |
| 35 | * Things left to do: |
| 36 | * - Formatting |
| 37 | * - Maybe a better strategy for disk change detection (does anyone |
| 38 | * know one?) |
| 39 | * - There are some strange problems left: The strangest one is |
| 40 | * that, at least on my TT (4+4MB), the first 2 Bytes of the last |
| 41 | * page of the TT-Ram (!) change their contents (some bits get |
| 42 | * set) while a floppy DMA is going on. But there are no accesses |
| 43 | * to these memory locations from the kernel... (I tested that by |
| 44 | * making the page read-only). I cannot explain what's going on... |
| 45 | * - Sometimes the drive-change-detection stops to work. The |
| 46 | * function is still called, but the WP bit always reads as 0... |
| 47 | * Maybe a problem with the status reg mode or a timing problem. |
| 48 | * Note 10/12/94: The change detection now seems to work reliably. |
| 49 | * There is no proof, but I've seen no hang for a long time... |
| 50 | * |
| 51 | * ARCHIMEDES changes: (gilbertd@cs.man.ac.uk) |
| 52 | * 26/12/95 - Changed all names starting with FDC to FDC1772 |
| 53 | * Removed all references to clock speed of FDC - we're stuck with 8MHz |
| 54 | * Modified disk_type structure to remove HD formats |
| 55 | * |
| 56 | * 7/ 1/96 - Wrote FIQ code, removed most remaining atariisms |
| 57 | * |
| 58 | * 13/ 1/96 - Well I think its read a single sector; but there is a problem |
| 59 | * fd_rwsec_done which is called in FIQ mode starts another transfer |
| 60 | * off (in fd_rwsec) while still in FIQ mode. Because its still in |
| 61 | * FIQ mode it can't service the DMA and loses data. So need to |
| 62 | * heavily restructure. |
| 63 | * 14/ 1/96 - Found that the definitions of the register numbers of the |
| 64 | * FDC were multiplied by 2 in the header for the 16bit words |
| 65 | * of the atari so half the writes were going in the wrong place. |
| 66 | * Also realised that the FIQ entry didn't make any attempt to |
| 67 | * preserve registers or return correctly; now in assembler. |
| 68 | * |
| 69 | * 11/ 2/96 - Hmm - doesn't work on real machine. Auto detect doesn't |
| 70 | * and hacking that past seems to wait forever - check motor |
| 71 | * being turned on. |
| 72 | * |
| 73 | * 17/ 2/96 - still having problems - forcing track to -1 when selecting |
| 74 | * new drives seems to allow it to read first few sectors |
| 75 | * but then we get solid hangs at apparently random places |
| 76 | * which change depending what is happening. |
| 77 | * |
| 78 | * 9/ 3/96 - Fiddled a lot of stuff around to move to kernel 1.3.35 |
| 79 | * A lot of fiddling in DMA stuff. Having problems with it |
| 80 | * constnatly thinking its timeing out. Ah - its timeout |
| 81 | * was set to (6*HZ) rather than jiffies+(6*HZ). Now giving |
| 82 | * duff data! |
| 83 | * |
| 84 | * 5/ 4/96 - Made it use the new IOC_ macros rather than *ioc |
| 85 | * Hmm - giving unexpected FIQ and then timeouts |
| 86 | * 18/ 8/96 - Ran through indent -kr -i8 |
| 87 | * Some changes to disc change detect; don't know how well it |
| 88 | * works. |
| 89 | * 24/ 8/96 - Put all the track buffering code back in from the atari |
| 90 | * code - I wonder if it will still work... No :-) |
| 91 | * Still works if I turn off track buffering. |
| 92 | * 25/ 8/96 - Changed the timer expires that I'd added back to be |
| 93 | * jiffies + ....; and it all sprang to life! Got 2.8K/sec |
| 94 | * off a cp -r of a 679K disc (showed 94% cpu usage!) |
| 95 | * (PC gets 14.3K/sec - 0% CPU!) Hmm - hard drive corrupt! |
| 96 | * Also perhaps that compile was with cache off. |
| 97 | * changed cli in fd_readtrack_check to cliIF |
| 98 | * changed vmallocs to kmalloc (whats the difference!!) |
| 99 | * Removed the busy wait loop in do_fd_request and replaced |
| 100 | * by a routine on tq_immediate; only 11% cpu on a dd off the |
| 101 | * raw disc - but the speed is the same. |
| 102 | * 1/ 9/96 - Idea (failed!) - set the 'disable spin-up sequence' |
| 103 | * when we read the track if we know the motor is on; didn't |
| 104 | * help - perhaps we have to do it in stepping as well. |
| 105 | * Nope. Still doesn't help. |
| 106 | * Hmm - what seems to be happening is that fd_readtrack_check |
| 107 | * is never getting called. Its job is to terminate the read |
| 108 | * just after we think we should have got the data; otherwise |
| 109 | * the fdc takes 1 second to timeout; which is what's happening |
| 110 | * Now I can see 'readtrack_timer' being set (which should do the |
| 111 | * call); but it never seems to be called - hmm! |
| 112 | * OK - I've moved the check to my tq_immediate code - |
| 113 | * and it WORKS! 13.95K/second at 19% CPU. |
| 114 | * I wish I knew why that timer didn't work..... |
| 115 | * |
| 116 | * 16/11/96 - Fiddled and frigged for 2.0.18 |
| 117 | * |
| 118 | * DAG 30/01/99 - Started frobbing for 2.2.1 |
| 119 | * DAG 20/06/99 - A little more frobbing: |
| 120 | * Included include/asm/uaccess.h for get_user/put_user |
| 121 | * |
| 122 | * DAG 1/09/00 - Dusted off for 2.4.0-test7 |
| 123 | * MAX_SECTORS was name clashing so it is now FD1772_... |
| 124 | * Minor parameter, name layouts for 2.4.x differences |
| 125 | */ |
| 126 | |
| 127 | #include <linux/sched.h> |
| 128 | #include <linux/fs.h> |
| 129 | #include <linux/fcntl.h> |
| 130 | #include <linux/slab.h> |
| 131 | #include <linux/kernel.h> |
| 132 | #include <linux/interrupt.h> |
| 133 | #include <linux/timer.h> |
| 134 | #include <linux/workqueue.h> |
| 135 | #include <linux/fd.h> |
| 136 | #include <linux/fd1772.h> |
| 137 | #include <linux/errno.h> |
| 138 | #include <linux/types.h> |
| 139 | #include <linux/delay.h> |
| 140 | #include <linux/mm.h> |
| 141 | #include <linux/bitops.h> |
| 142 | |
| 143 | #include <asm/arch/oldlatches.h> |
| 144 | #include <asm/dma.h> |
| 145 | #include <asm/hardware.h> |
| 146 | #include <asm/hardware/ioc.h> |
| 147 | #include <asm/io.h> |
| 148 | #include <asm/irq.h> |
| 149 | #include <asm/mach-types.h> |
| 150 | #include <asm/pgtable.h> |
| 151 | #include <asm/system.h> |
| 152 | #include <asm/uaccess.h> |
| 153 | |
| 154 | |
| 155 | /* Note: FD_MAX_UNITS could be redefined to 2 for the Atari (with |
| 156 | * little additional rework in this file). But I'm not yet sure if |
| 157 | * some other code depends on the number of floppies... (It is defined |
| 158 | * in a public header!) |
| 159 | */ |
| 160 | #if 0 |
| 161 | #undef FD_MAX_UNITS |
| 162 | #define FD_MAX_UNITS 2 |
| 163 | #endif |
| 164 | |
| 165 | /* Ditto worries for Arc - DAG */ |
| 166 | #define FD_MAX_UNITS 4 |
| 167 | #define TRACKBUFFER 0 |
| 168 | /*#define DEBUG*/ |
| 169 | |
| 170 | #ifdef DEBUG |
| 171 | #define DPRINT(a) printk a |
| 172 | #else |
| 173 | #define DPRINT(a) |
| 174 | #endif |
| 175 | |
| 176 | static struct request_queue *floppy_queue; |
| 177 | |
| 178 | #define MAJOR_NR FLOPPY_MAJOR |
| 179 | #define FLOPPY_DMA 0 |
| 180 | #define DEVICE_NAME "floppy" |
| 181 | #define QUEUE (floppy_queue) |
| 182 | #define CURRENT elv_next_request(floppy_queue) |
| 183 | |
| 184 | /* Disk types: DD */ |
| 185 | static struct archy_disk_type { |
| 186 | const char *name; |
| 187 | unsigned spt; /* sectors per track */ |
| 188 | unsigned blocks; /* total number of blocks */ |
| 189 | unsigned stretch; /* track doubling ? */ |
| 190 | } disk_type[] = { |
| 191 | |
| 192 | { "d360", 9, 720, 0 }, /* 360kB diskette */ |
| 193 | { "D360", 9, 720, 1 }, /* 360kb in 720kb drive */ |
| 194 | { "D720", 9, 1440, 0 }, /* 720kb diskette (DD) */ |
| 195 | /*{ "D820", 10,1640, 0}, *//* DD disk with 82 tracks/10 sectors |
| 196 | - DAG - can't see how type detect can distinguish this |
| 197 | from 720K until it reads block 4 by which time its too late! */ |
| 198 | }; |
| 199 | |
| 200 | #define NUM_DISK_TYPES (sizeof(disk_type)/sizeof(*disk_type)) |
| 201 | |
| 202 | /* |
| 203 | * Maximum disk size (in kilobytes). This default is used whenever the |
| 204 | * current disk size is unknown. |
| 205 | */ |
| 206 | #define MAX_DISK_SIZE 720 |
| 207 | |
| 208 | static struct gendisk *disks[FD_MAX_UNIT]; |
| 209 | |
| 210 | /* current info on each unit */ |
| 211 | static struct archy_floppy_struct { |
| 212 | int connected; /* !=0 : drive is connected */ |
| 213 | int autoprobe; /* !=0 : do autoprobe */ |
| 214 | |
| 215 | struct archy_disk_type *disktype; /* current type of disk */ |
| 216 | |
| 217 | int track; /* current head position or -1 |
| 218 | * if unknown */ |
| 219 | unsigned int steprate; /* steprate setting */ |
| 220 | unsigned int wpstat; /* current state of WP signal |
| 221 | * (for disk change detection) */ |
| 222 | } unit[FD_MAX_UNITS]; |
| 223 | |
| 224 | /* DAG: On Arc we spin on a flag being cleared by fdc1772_comendhandler which |
| 225 | is an assembler routine */ |
| 226 | extern void fdc1772_comendhandler(void); /* Actually doens't have these parameters - see fd1772.S */ |
| 227 | extern volatile int fdc1772_comendstatus; |
| 228 | extern volatile int fdc1772_fdc_int_done; |
| 229 | |
| 230 | #define FDC1772BASE ((0x210000>>2)|0x80000000) |
| 231 | |
| 232 | #define FDC1772_READ(reg) inb(FDC1772BASE+(reg/2)) |
| 233 | |
| 234 | /* DAG: You wouldn't be silly to ask why FDC1772_WRITE is a function rather |
| 235 | than the #def below - well simple - the #def won't compile - and I |
| 236 | don't understand why (__outwc not defined) */ |
| 237 | /* NOTE: Reg is 0,2,4,6 as opposed to 0,1,2,3 or 0,4,8,12 to keep compatibility |
| 238 | with the ST version of fd1772.h */ |
| 239 | /*#define FDC1772_WRITE(reg,val) outw(val,(reg+FDC1772BASE)); */ |
| 240 | void FDC1772_WRITE(int reg, unsigned char val) |
| 241 | { |
| 242 | if (reg == FDC1772REG_CMD) { |
| 243 | DPRINT(("FDC1772_WRITE new command 0x%x @ %d\n", val,jiffies)); |
| 244 | if (fdc1772_fdc_int_done) { |
| 245 | DPRINT(("FDC1772_WRITE: Hmm fdc1772_fdc_int_done true - resetting\n")); |
| 246 | fdc1772_fdc_int_done = 0; |
| 247 | }; |
| 248 | }; |
| 249 | outb(val, (reg / 2) + FDC1772BASE); |
| 250 | }; |
| 251 | |
| 252 | #define FD1772_MAX_SECTORS 22 |
| 253 | |
| 254 | unsigned char *DMABuffer; /* buffer for writes */ |
| 255 | /*static unsigned long PhysDMABuffer; *//* physical address */ |
| 256 | /* DAG: On Arc we just go straight for the DMA buffer */ |
| 257 | #define PhysDMABuffer DMABuffer |
| 258 | |
| 259 | #ifdef TRACKBUFFER |
| 260 | unsigned char *TrackBuffer; /* buffer for reads */ |
| 261 | #define PhysTrackBuffer TrackBuffer /* physical address */ |
| 262 | static int BufferDrive, BufferSide, BufferTrack; |
| 263 | static int read_track; /* non-zero if we are reading whole tracks */ |
| 264 | |
| 265 | #define SECTOR_BUFFER(sec) (TrackBuffer + ((sec)-1)*512) |
| 266 | #define IS_BUFFERED(drive,side,track) \ |
| 267 | (BufferDrive == (drive) && BufferSide == (side) && BufferTrack == (track)) |
| 268 | #endif |
| 269 | |
| 270 | /* |
| 271 | * These are global variables, as that's the easiest way to give |
| 272 | * information to interrupts. They are the data used for the current |
| 273 | * request. |
| 274 | */ |
| 275 | static int SelectedDrive = 0; |
| 276 | static int ReqCmd, ReqBlock; |
| 277 | static int ReqSide, ReqTrack, ReqSector, ReqCnt; |
| 278 | static int HeadSettleFlag = 0; |
| 279 | static unsigned char *ReqData, *ReqBuffer; |
| 280 | static int MotorOn = 0, MotorOffTrys; |
| 281 | |
| 282 | /* Synchronization of FDC1772 access. */ |
| 283 | static volatile int fdc_busy = 0; |
| 284 | static DECLARE_WAIT_QUEUE_HEAD(fdc_wait); |
| 285 | |
| 286 | |
| 287 | /* long req'd for set_bit --RR */ |
| 288 | static unsigned long changed_floppies = 0xff, fake_change = 0; |
| 289 | #define CHECK_CHANGE_DELAY HZ/2 |
| 290 | |
| 291 | /* DAG - increased to 30*HZ - not sure if this is the correct thing to do */ |
| 292 | #define FD_MOTOR_OFF_DELAY (10*HZ) |
| 293 | #define FD_MOTOR_OFF_MAXTRY (10*20) |
| 294 | |
| 295 | #define FLOPPY_TIMEOUT (6*HZ) |
| 296 | #define RECALIBRATE_ERRORS 4 /* After this many errors the drive |
| 297 | * will be recalibrated. */ |
| 298 | #define MAX_ERRORS 8 /* After this many errors the driver |
| 299 | * will give up. */ |
| 300 | |
| 301 | #define START_MOTOR_OFF_TIMER(delay) \ |
| 302 | do { \ |
| 303 | motor_off_timer.expires = jiffies + (delay); \ |
| 304 | add_timer( &motor_off_timer ); \ |
| 305 | MotorOffTrys = 0; \ |
| 306 | } while(0) |
| 307 | |
| 308 | #define START_CHECK_CHANGE_TIMER(delay) \ |
| 309 | do { \ |
| 310 | mod_timer(&fd_timer, jiffies + (delay)); \ |
| 311 | } while(0) |
| 312 | |
| 313 | #define START_TIMEOUT() \ |
| 314 | do { \ |
| 315 | mod_timer(&timeout_timer, jiffies+FLOPPY_TIMEOUT); \ |
| 316 | } while(0) |
| 317 | |
| 318 | #define STOP_TIMEOUT() \ |
| 319 | do { \ |
| 320 | del_timer( &timeout_timer ); \ |
| 321 | } while(0) |
| 322 | |
| 323 | #define ENABLE_IRQ() enable_irq(FIQ_FD1772+64); |
| 324 | |
| 325 | #define DISABLE_IRQ() disable_irq(FIQ_FD1772+64); |
| 326 | |
| 327 | static void fd1772_checkint(void); |
| 328 | |
| 329 | DECLARE_WORK(fd1772_tq, (void *)fd1772_checkint, NULL); |
| 330 | /* |
| 331 | * The driver is trying to determine the correct media format |
| 332 | * while Probing is set. fd_rwsec_done() clears it after a |
| 333 | * successful access. |
| 334 | */ |
| 335 | static int Probing = 0; |
| 336 | |
| 337 | /* This flag is set when a dummy seek is necessary to make the WP |
| 338 | * status bit accessible. |
| 339 | */ |
| 340 | static int NeedSeek = 0; |
| 341 | |
| 342 | |
| 343 | /***************************** Prototypes *****************************/ |
| 344 | |
| 345 | static void fd_select_side(int side); |
| 346 | static void fd_select_drive(int drive); |
| 347 | static void fd_deselect(void); |
| 348 | static void fd_motor_off_timer(unsigned long dummy); |
| 349 | static void check_change(unsigned long dummy); |
| 350 | static void floppy_irqconsequencehandler(void); |
| 351 | static void fd_error(void); |
| 352 | static void do_fd_action(int drive); |
| 353 | static void fd_calibrate(void); |
| 354 | static void fd_calibrate_done(int status); |
| 355 | static void fd_seek(void); |
| 356 | static void fd_seek_done(int status); |
| 357 | static void fd_rwsec(void); |
| 358 | #ifdef TRACKBUFFER |
| 359 | static void fd_readtrack_check( unsigned long dummy ); |
| 360 | #endif |
| 361 | static void fd_rwsec_done(int status); |
| 362 | static void fd_times_out(unsigned long dummy); |
| 363 | static void finish_fdc(void); |
| 364 | static void finish_fdc_done(int dummy); |
| 365 | static void floppy_off(unsigned int nr); |
| 366 | static void setup_req_params(int drive); |
| 367 | static void redo_fd_request(void); |
| 368 | static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int |
| 369 | cmd, unsigned long param); |
| 370 | static void fd_probe(int drive); |
| 371 | static int fd_test_drive_present(int drive); |
| 372 | static void config_types(void); |
| 373 | static int floppy_open(struct inode *inode, struct file *filp); |
| 374 | static int floppy_release(struct inode *inode, struct file *filp); |
| 375 | static void do_fd_request(request_queue_t *); |
| 376 | |
| 377 | /************************* End of Prototypes **************************/ |
| 378 | |
| 379 | static struct timer_list motor_off_timer = |
| 380 | TIMER_INITIALIZER(fd_motor_off_timer, 0, 0); |
| 381 | |
| 382 | #ifdef TRACKBUFFER |
| 383 | static struct timer_list readtrack_timer = |
| 384 | TIMER_INITIALIZER(fd_readtrack_check, 0, 0); |
| 385 | #endif |
| 386 | |
| 387 | static struct timer_list timeout_timer = |
| 388 | TIMER_INITIALIZER(fd_times_out, 0, 0); |
| 389 | |
| 390 | static struct timer_list fd_timer = |
| 391 | TIMER_INITIALIZER(check_change, 0, 0); |
| 392 | |
| 393 | /* DAG: Haven't got a clue what this is? */ |
| 394 | int stdma_islocked(void) |
| 395 | { |
| 396 | return 0; |
| 397 | }; |
| 398 | |
| 399 | /* Select the side to use. */ |
| 400 | |
| 401 | static void fd_select_side(int side) |
| 402 | { |
| 403 | oldlatch_aupdate(LATCHA_SIDESEL, side ? 0 : LATCHA_SIDESEL); |
| 404 | } |
| 405 | |
| 406 | |
| 407 | /* Select a drive, update the FDC1772's track register |
| 408 | */ |
| 409 | |
| 410 | static void fd_select_drive(int drive) |
| 411 | { |
| 412 | #ifdef DEBUG |
| 413 | printk("fd_select_drive:%d\n", drive); |
| 414 | #endif |
| 415 | /* Hmm - nowhere do we seem to turn the motor on - I'm going to do it here! */ |
| 416 | oldlatch_aupdate(LATCHA_MOTOR | LATCHA_INUSE, 0); |
| 417 | |
| 418 | if (drive == SelectedDrive) |
| 419 | return; |
| 420 | |
| 421 | oldlatch_aupdate(LATCHA_FDSELALL, 0xf - (1 << drive)); |
| 422 | |
| 423 | /* restore track register to saved value */ |
| 424 | FDC1772_WRITE(FDC1772REG_TRACK, unit[drive].track); |
| 425 | udelay(25); |
| 426 | |
| 427 | SelectedDrive = drive; |
| 428 | } |
| 429 | |
| 430 | |
| 431 | /* Deselect both drives. */ |
| 432 | |
| 433 | static void fd_deselect(void) |
| 434 | { |
| 435 | unsigned long flags; |
| 436 | |
| 437 | DPRINT(("fd_deselect\n")); |
| 438 | |
| 439 | oldlatch_aupdate(LATCHA_FDSELALL | LATCHA_MOTOR | LATCHA_INUSE, 0xf | LATCHA_MOTOR | LATCHA_INUSE); |
| 440 | |
| 441 | SelectedDrive = -1; |
| 442 | } |
| 443 | |
| 444 | |
| 445 | /* This timer function deselects the drives when the FDC1772 switched the |
| 446 | * motor off. The deselection cannot happen earlier because the FDC1772 |
| 447 | * counts the index signals, which arrive only if one drive is selected. |
| 448 | */ |
| 449 | |
| 450 | static void fd_motor_off_timer(unsigned long dummy) |
| 451 | { |
| 452 | unsigned long flags; |
| 453 | unsigned char status; |
| 454 | int delay; |
| 455 | |
| 456 | del_timer(&motor_off_timer); |
| 457 | |
| 458 | if (SelectedDrive < 0) |
| 459 | /* no drive selected, needn't deselect anyone */ |
| 460 | return; |
| 461 | |
| 462 | save_flags(flags); |
| 463 | cli(); |
| 464 | |
| 465 | if (fdc_busy) /* was stdma_islocked */ |
| 466 | goto retry; |
| 467 | |
| 468 | status = FDC1772_READ(FDC1772REG_STATUS); |
| 469 | |
| 470 | if (!(status & 0x80)) { |
| 471 | /* |
| 472 | * motor already turned off by FDC1772 -> deselect drives |
| 473 | * In actual fact its this deselection which turns the motor |
| 474 | * off on the Arc, since the motor control is actually on |
| 475 | * Latch A |
| 476 | */ |
| 477 | DPRINT(("fdc1772: deselecting in fd_motor_off_timer\n")); |
| 478 | fd_deselect(); |
| 479 | MotorOn = 0; |
| 480 | restore_flags(flags); |
| 481 | return; |
| 482 | } |
| 483 | /* not yet off, try again */ |
| 484 | |
| 485 | retry: |
| 486 | restore_flags(flags); |
| 487 | /* Test again later; if tested too often, it seems there is no disk |
| 488 | * in the drive and the FDC1772 will leave the motor on forever (or, |
| 489 | * at least until a disk is inserted). So we'll test only twice |
| 490 | * per second from then on... |
| 491 | */ |
| 492 | delay = (MotorOffTrys < FD_MOTOR_OFF_MAXTRY) ? |
| 493 | (++MotorOffTrys, HZ / 20) : HZ / 2; |
| 494 | START_MOTOR_OFF_TIMER(delay); |
| 495 | } |
| 496 | |
| 497 | |
| 498 | /* This function is repeatedly called to detect disk changes (as good |
| 499 | * as possible) and keep track of the current state of the write protection. |
| 500 | */ |
| 501 | |
| 502 | static void check_change(unsigned long dummy) |
| 503 | { |
| 504 | static int drive = 0; |
| 505 | |
| 506 | unsigned long flags; |
| 507 | int stat; |
| 508 | |
| 509 | if (fdc_busy) |
| 510 | return; /* Don't start poking about if the fdc is busy */ |
| 511 | |
| 512 | return; /* let's just forget it for the mo DAG */ |
| 513 | |
| 514 | if (++drive > 1 || !unit[drive].connected) |
| 515 | drive = 0; |
| 516 | |
| 517 | save_flags(flags); |
| 518 | cli(); |
| 519 | |
| 520 | if (!stdma_islocked()) { |
| 521 | stat = !!(FDC1772_READ(FDC1772REG_STATUS) & FDC1772STAT_WPROT); |
| 522 | |
| 523 | /* The idea here is that if the write protect line has changed then |
| 524 | the disc must have changed */ |
| 525 | if (stat != unit[drive].wpstat) { |
| 526 | DPRINT(("wpstat[%d] = %d\n", drive, stat)); |
| 527 | unit[drive].wpstat = stat; |
| 528 | set_bit(drive, &changed_floppies); |
| 529 | } |
| 530 | } |
| 531 | restore_flags(flags); |
| 532 | |
| 533 | START_CHECK_CHANGE_TIMER(CHECK_CHANGE_DELAY); |
| 534 | } |
| 535 | |
| 536 | |
| 537 | /* Handling of the Head Settling Flag: This flag should be set after each |
| 538 | * seek operation, because we don't use seeks with verify. |
| 539 | */ |
| 540 | |
| 541 | static inline void set_head_settle_flag(void) |
| 542 | { |
| 543 | HeadSettleFlag = FDC1772CMDADD_E; |
| 544 | } |
| 545 | |
| 546 | static inline int get_head_settle_flag(void) |
| 547 | { |
| 548 | int tmp = HeadSettleFlag; |
| 549 | HeadSettleFlag = 0; |
| 550 | return (tmp); |
| 551 | } |
| 552 | |
| 553 | |
| 554 | |
| 555 | |
| 556 | /* General Interrupt Handling */ |
| 557 | |
| 558 | static inline void copy_buffer(void *from, void *to) |
| 559 | { |
| 560 | ulong *p1 = (ulong *) from, *p2 = (ulong *) to; |
| 561 | int cnt; |
| 562 | |
| 563 | for (cnt = 512 / 4; cnt; cnt--) |
| 564 | *p2++ = *p1++; |
| 565 | } |
| 566 | |
| 567 | static void (*FloppyIRQHandler) (int status) = NULL; |
| 568 | |
| 569 | static void floppy_irqconsequencehandler(void) |
| 570 | { |
| 571 | unsigned char status; |
| 572 | void (*handler) (int); |
| 573 | |
| 574 | fdc1772_fdc_int_done = 0; |
| 575 | |
| 576 | handler = FloppyIRQHandler; |
| 577 | FloppyIRQHandler = NULL; |
| 578 | |
| 579 | if (handler) { |
| 580 | nop(); |
| 581 | status = (unsigned char) fdc1772_comendstatus; |
| 582 | DPRINT(("FDC1772 irq, status = %02x handler = %08lx\n", (unsigned int) status, (unsigned long) handler)); |
| 583 | handler(status); |
| 584 | } else { |
| 585 | DPRINT(("FDC1772 irq, no handler status=%02x\n", fdc1772_comendstatus)); |
| 586 | } |
| 587 | DPRINT(("FDC1772 irq: end of floppy_irq\n")); |
| 588 | } |
| 589 | |
| 590 | |
| 591 | /* Error handling: If some error happened, retry some times, then |
| 592 | * recalibrate, then try again, and fail after MAX_ERRORS. |
| 593 | */ |
| 594 | |
| 595 | static void fd_error(void) |
| 596 | { |
| 597 | printk("FDC1772: fd_error\n"); |
| 598 | /*panic("fd1772: fd_error"); *//* DAG tmp */ |
| 599 | if (!CURRENT) |
| 600 | return; |
| 601 | CURRENT->errors++; |
| 602 | if (CURRENT->errors >= MAX_ERRORS) { |
| 603 | printk("fd%d: too many errors.\n", SelectedDrive); |
| 604 | end_request(CURRENT, 0); |
| 605 | } else if (CURRENT->errors == RECALIBRATE_ERRORS) { |
| 606 | printk("fd%d: recalibrating\n", SelectedDrive); |
| 607 | if (SelectedDrive != -1) |
| 608 | unit[SelectedDrive].track = -1; |
| 609 | } |
| 610 | redo_fd_request(); |
| 611 | } |
| 612 | |
| 613 | |
| 614 | |
| 615 | #define SET_IRQ_HANDLER(proc) do { FloppyIRQHandler = (proc); } while(0) |
| 616 | |
| 617 | |
| 618 | /* do_fd_action() is the general procedure for a fd request: All |
| 619 | * required parameter settings (drive select, side select, track |
| 620 | * position) are checked and set if needed. For each of these |
| 621 | * parameters and the actual reading or writing exist two functions: |
| 622 | * one that starts the setting (or skips it if possible) and one |
| 623 | * callback for the "done" interrupt. Each done func calls the next |
| 624 | * set function to propagate the request down to fd_rwsec_done(). |
| 625 | */ |
| 626 | |
| 627 | static void do_fd_action(int drive) |
| 628 | { |
| 629 | struct request *req; |
| 630 | DPRINT(("do_fd_action unit[drive].track=%d\n", unit[drive].track)); |
| 631 | |
| 632 | #ifdef TRACKBUFFER |
| 633 | repeat: |
| 634 | |
| 635 | if (IS_BUFFERED( drive, ReqSide, ReqTrack )) { |
| 636 | req = CURRENT; |
| 637 | if (ReqCmd == READ) { |
| 638 | copy_buffer( SECTOR_BUFFER(ReqSector), ReqData ); |
| 639 | if (++ReqCnt < req->current_nr_sectors) { |
| 640 | /* read next sector */ |
| 641 | setup_req_params( drive ); |
| 642 | goto repeat; |
| 643 | } else { |
| 644 | /* all sectors finished */ |
| 645 | req->nr_sectors -= req->current_nr_sectors; |
| 646 | req->sector += req->current_nr_sectors; |
| 647 | end_request(req, 1); |
| 648 | redo_fd_request(); |
| 649 | return; |
| 650 | } |
| 651 | } else { |
| 652 | /* cmd == WRITE, pay attention to track buffer |
| 653 | * consistency! */ |
| 654 | copy_buffer( ReqData, SECTOR_BUFFER(ReqSector) ); |
| 655 | } |
| 656 | } |
| 657 | #endif |
| 658 | |
| 659 | if (SelectedDrive != drive) { |
| 660 | /*unit[drive].track = -1; DAG */ |
| 661 | fd_select_drive(drive); |
| 662 | }; |
| 663 | |
| 664 | |
| 665 | if (unit[drive].track == -1) |
| 666 | fd_calibrate(); |
| 667 | else if (unit[drive].track != ReqTrack << unit[drive].disktype->stretch) |
| 668 | fd_seek(); |
| 669 | else |
| 670 | fd_rwsec(); |
| 671 | } |
| 672 | |
| 673 | |
| 674 | /* Seek to track 0 if the current track is unknown */ |
| 675 | |
| 676 | static void fd_calibrate(void) |
| 677 | { |
| 678 | DPRINT(("fd_calibrate\n")); |
| 679 | if (unit[SelectedDrive].track >= 0) { |
| 680 | fd_calibrate_done(0); |
| 681 | return; |
| 682 | } |
| 683 | DPRINT(("fd_calibrate (after track compare)\n")); |
| 684 | SET_IRQ_HANDLER(fd_calibrate_done); |
| 685 | /* we can't verify, since the speed may be incorrect */ |
| 686 | FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_RESTORE | unit[SelectedDrive].steprate); |
| 687 | |
| 688 | NeedSeek = 1; |
| 689 | MotorOn = 1; |
| 690 | START_TIMEOUT(); |
| 691 | /* wait for IRQ */ |
| 692 | } |
| 693 | |
| 694 | |
| 695 | static void fd_calibrate_done(int status) |
| 696 | { |
| 697 | DPRINT(("fd_calibrate_done()\n")); |
| 698 | STOP_TIMEOUT(); |
| 699 | |
| 700 | /* set the correct speed now */ |
| 701 | if (status & FDC1772STAT_RECNF) { |
| 702 | printk("fd%d: restore failed\n", SelectedDrive); |
| 703 | fd_error(); |
| 704 | } else { |
| 705 | unit[SelectedDrive].track = 0; |
| 706 | fd_seek(); |
| 707 | } |
| 708 | } |
| 709 | |
| 710 | |
| 711 | /* Seek the drive to the requested track. The drive must have been |
| 712 | * calibrated at some point before this. |
| 713 | */ |
| 714 | |
| 715 | static void fd_seek(void) |
| 716 | { |
| 717 | unsigned long flags; |
| 718 | DPRINT(("fd_seek() to track %d (unit[SelectedDrive].track=%d)\n", ReqTrack, |
| 719 | unit[SelectedDrive].track)); |
| 720 | if (unit[SelectedDrive].track == ReqTrack << |
| 721 | unit[SelectedDrive].disktype->stretch) { |
| 722 | fd_seek_done(0); |
| 723 | return; |
| 724 | } |
| 725 | FDC1772_WRITE(FDC1772REG_DATA, ReqTrack << |
| 726 | unit[SelectedDrive].disktype->stretch); |
| 727 | udelay(25); |
| 728 | save_flags(flags); |
| 729 | clf(); |
| 730 | SET_IRQ_HANDLER(fd_seek_done); |
| 731 | FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_SEEK | unit[SelectedDrive].steprate | |
| 732 | /* DAG */ |
| 733 | (MotorOn?FDC1772CMDADD_H:0)); |
| 734 | |
| 735 | restore_flags(flags); |
| 736 | MotorOn = 1; |
| 737 | set_head_settle_flag(); |
| 738 | START_TIMEOUT(); |
| 739 | /* wait for IRQ */ |
| 740 | } |
| 741 | |
| 742 | |
| 743 | static void fd_seek_done(int status) |
| 744 | { |
| 745 | DPRINT(("fd_seek_done()\n")); |
| 746 | STOP_TIMEOUT(); |
| 747 | |
| 748 | /* set the correct speed */ |
| 749 | if (status & FDC1772STAT_RECNF) { |
| 750 | printk("fd%d: seek error (to track %d)\n", |
| 751 | SelectedDrive, ReqTrack); |
| 752 | /* we don't know exactly which track we are on now! */ |
| 753 | unit[SelectedDrive].track = -1; |
| 754 | fd_error(); |
| 755 | } else { |
| 756 | unit[SelectedDrive].track = ReqTrack << |
| 757 | unit[SelectedDrive].disktype->stretch; |
| 758 | NeedSeek = 0; |
| 759 | fd_rwsec(); |
| 760 | } |
| 761 | } |
| 762 | |
| 763 | |
| 764 | /* This does the actual reading/writing after positioning the head |
| 765 | * over the correct track. |
| 766 | */ |
| 767 | |
| 768 | #ifdef TRACKBUFFER |
| 769 | static int MultReadInProgress = 0; |
| 770 | #endif |
| 771 | |
| 772 | |
| 773 | static void fd_rwsec(void) |
| 774 | { |
| 775 | unsigned long paddr, flags; |
| 776 | unsigned int rwflag, old_motoron; |
| 777 | unsigned int track; |
| 778 | |
| 779 | DPRINT(("fd_rwsec(), Sec=%d, Access=%c\n", ReqSector, ReqCmd == WRITE ? 'w' : 'r')); |
| 780 | if (ReqCmd == WRITE) { |
| 781 | /*cache_push( (unsigned long)ReqData, 512 ); */ |
| 782 | paddr = (unsigned long) ReqData; |
| 783 | rwflag = 0x100; |
| 784 | } else { |
| 785 | paddr = (unsigned long) PhysDMABuffer; |
| 786 | #ifdef TRACKBUFFER |
| 787 | if (read_track) |
| 788 | paddr = (unsigned long)PhysTrackBuffer; |
| 789 | #endif |
| 790 | rwflag = 0; |
| 791 | } |
| 792 | |
| 793 | DPRINT(("fd_rwsec() before sidesel rwflag=%d sec=%d trk=%d\n", rwflag, |
| 794 | ReqSector, FDC1772_READ(FDC1772REG_TRACK))); |
| 795 | fd_select_side(ReqSide); |
| 796 | |
| 797 | /*DPRINT(("fd_rwsec() before start sector \n")); */ |
| 798 | /* Start sector of this operation */ |
| 799 | #ifdef TRACKBUFFER |
| 800 | FDC1772_WRITE( FDC1772REG_SECTOR, !read_track ? ReqSector : 1 ); |
| 801 | #else |
| 802 | FDC1772_WRITE( FDC1772REG_SECTOR, ReqSector ); |
| 803 | #endif |
| 804 | |
| 805 | /* Cheat for track if stretch != 0 */ |
| 806 | if (unit[SelectedDrive].disktype->stretch) { |
| 807 | track = FDC1772_READ(FDC1772REG_TRACK); |
| 808 | FDC1772_WRITE(FDC1772REG_TRACK, track >> |
| 809 | unit[SelectedDrive].disktype->stretch); |
| 810 | } |
| 811 | udelay(25); |
| 812 | |
| 813 | DPRINT(("fd_rwsec() before setup DMA \n")); |
| 814 | /* Setup DMA - Heavily modified by DAG */ |
| 815 | save_flags(flags); |
| 816 | clf(); |
| 817 | disable_dma(FLOPPY_DMA); |
| 818 | set_dma_mode(FLOPPY_DMA, rwflag ? DMA_MODE_WRITE : DMA_MODE_READ); |
| 819 | set_dma_addr(FLOPPY_DMA, (long) paddr); /* DAG - changed from Atari specific */ |
| 820 | #ifdef TRACKBUFFER |
| 821 | set_dma_count(FLOPPY_DMA,(!read_track ? 1 : unit[SelectedDrive].disktype->spt)*512); |
| 822 | #else |
| 823 | set_dma_count(FLOPPY_DMA, 512); /* Block/sector size - going to have to change */ |
| 824 | #endif |
| 825 | SET_IRQ_HANDLER(fd_rwsec_done); |
| 826 | /* Turn on dma int */ |
| 827 | enable_dma(FLOPPY_DMA); |
| 828 | /* Now give it something to do */ |
| 829 | FDC1772_WRITE(FDC1772REG_CMD, (rwflag ? (FDC1772CMD_WRSEC | FDC1772CMDADD_P) : |
| 830 | #ifdef TRACKBUFFER |
| 831 | (FDC1772CMD_RDSEC | (read_track ? FDC1772CMDADD_M : 0) | |
| 832 | /* Hmm - the idea here is to stop the FDC spinning the disc |
| 833 | up when we know that we already still have it spinning */ |
| 834 | (MotorOn?FDC1772CMDADD_H:0)) |
| 835 | #else |
| 836 | FDC1772CMD_RDSEC |
| 837 | #endif |
| 838 | )); |
| 839 | |
| 840 | restore_flags(flags); |
| 841 | DPRINT(("fd_rwsec() after DMA setup flags=0x%08x\n", flags)); |
| 842 | /*sti(); *//* DAG - Hmm */ |
| 843 | /* Hmm - should do something DAG */ |
| 844 | old_motoron = MotorOn; |
| 845 | MotorOn = 1; |
| 846 | NeedSeek = 1; |
| 847 | |
| 848 | /* wait for interrupt */ |
| 849 | |
| 850 | #ifdef TRACKBUFFER |
| 851 | if (read_track) { |
| 852 | /* |
| 853 | * If reading a whole track, wait about one disk rotation and |
| 854 | * then check if all sectors are read. The FDC will even |
| 855 | * search for the first non-existant sector and need 1 sec to |
| 856 | * recognise that it isn't present :-( |
| 857 | */ |
| 858 | /* 1 rot. + 5 rot.s if motor was off */ |
| 859 | mod_timer(&readtrack_timer, jiffies + HZ/5 + (old_motoron ? 0 : HZ)); |
| 860 | DPRINT(("Setting readtrack_timer to %d @ %d\n", |
| 861 | readtrack_timer.expires,jiffies)); |
| 862 | MultReadInProgress = 1; |
| 863 | } |
| 864 | #endif |
| 865 | |
| 866 | /*DPRINT(("fd_rwsec() before START_TIMEOUT \n")); */ |
| 867 | START_TIMEOUT(); |
| 868 | /*DPRINT(("fd_rwsec() after START_TIMEOUT \n")); */ |
| 869 | } |
| 870 | |
| 871 | |
| 872 | #ifdef TRACKBUFFER |
| 873 | |
| 874 | static void fd_readtrack_check(unsigned long dummy) |
| 875 | { |
| 876 | unsigned long flags, addr; |
| 877 | extern unsigned char *fdc1772_dataaddr; |
| 878 | |
| 879 | DPRINT(("fd_readtrack_check @ %d\n",jiffies)); |
| 880 | |
| 881 | save_flags(flags); |
| 882 | clf(); |
| 883 | |
| 884 | del_timer( &readtrack_timer ); |
| 885 | |
| 886 | if (!MultReadInProgress) { |
| 887 | /* This prevents a race condition that could arise if the |
| 888 | * interrupt is triggered while the calling of this timer |
| 889 | * callback function takes place. The IRQ function then has |
| 890 | * already cleared 'MultReadInProgress' when control flow |
| 891 | * gets here. |
| 892 | */ |
| 893 | restore_flags(flags); |
| 894 | return; |
| 895 | } |
| 896 | |
| 897 | /* get the current DMA address */ |
| 898 | addr=(unsigned long)fdc1772_dataaddr; /* DAG - ? */ |
| 899 | DPRINT(("fd_readtrack_check: addr=%x PhysTrackBuffer=%x\n",addr,PhysTrackBuffer)); |
| 900 | |
| 901 | if (addr >= (unsigned int)PhysTrackBuffer + unit[SelectedDrive].disktype->spt*512) { |
| 902 | /* already read enough data, force an FDC interrupt to stop |
| 903 | * the read operation |
| 904 | */ |
| 905 | SET_IRQ_HANDLER( NULL ); |
| 906 | restore_flags(flags); |
| 907 | DPRINT(("fd_readtrack_check(): done\n")); |
| 908 | FDC1772_WRITE( FDC1772REG_CMD, FDC1772CMD_FORCI ); |
| 909 | udelay(25); |
| 910 | |
| 911 | /* No error until now -- the FDC would have interrupted |
| 912 | * otherwise! |
| 913 | */ |
| 914 | fd_rwsec_done( 0 ); |
| 915 | } else { |
| 916 | /* not yet finished, wait another tenth rotation */ |
| 917 | restore_flags(flags); |
| 918 | DPRINT(("fd_readtrack_check(): not yet finished\n")); |
| 919 | readtrack_timer.expires = jiffies + HZ/5/10; |
| 920 | add_timer( &readtrack_timer ); |
| 921 | } |
| 922 | } |
| 923 | |
| 924 | #endif |
| 925 | |
| 926 | static void fd_rwsec_done(int status) |
| 927 | { |
| 928 | unsigned int track; |
| 929 | |
| 930 | DPRINT(("fd_rwsec_done() status=%d @ %d\n", status,jiffies)); |
| 931 | |
| 932 | #ifdef TRACKBUFFER |
| 933 | if (read_track && !MultReadInProgress) |
| 934 | return; |
| 935 | |
| 936 | MultReadInProgress = 0; |
| 937 | |
| 938 | STOP_TIMEOUT(); |
| 939 | |
| 940 | if (read_track) |
| 941 | del_timer( &readtrack_timer ); |
| 942 | #endif |
| 943 | |
| 944 | |
| 945 | /* Correct the track if stretch != 0 */ |
| 946 | if (unit[SelectedDrive].disktype->stretch) { |
| 947 | track = FDC1772_READ(FDC1772REG_TRACK); |
| 948 | FDC1772_WRITE(FDC1772REG_TRACK, track << |
| 949 | unit[SelectedDrive].disktype->stretch); |
| 950 | } |
| 951 | if (ReqCmd == WRITE && (status & FDC1772STAT_WPROT)) { |
| 952 | printk("fd%d: is write protected\n", SelectedDrive); |
| 953 | goto err_end; |
| 954 | } |
| 955 | if ((status & FDC1772STAT_RECNF) |
| 956 | #ifdef TRACKBUFFER |
| 957 | /* RECNF is no error after a multiple read when the FDC |
| 958 | * searched for a non-existant sector! |
| 959 | */ |
| 960 | && !(read_track && |
| 961 | FDC1772_READ(FDC1772REG_SECTOR) > unit[SelectedDrive].disktype->spt) |
| 962 | #endif |
| 963 | ) { |
| 964 | if (Probing) { |
| 965 | if (unit[SelectedDrive].disktype > disk_type) { |
| 966 | /* try another disk type */ |
| 967 | unit[SelectedDrive].disktype--; |
| 968 | set_capacity(disks[SelectedDrive], |
| 969 | unit[SelectedDrive].disktype->blocks); |
| 970 | } else |
| 971 | Probing = 0; |
| 972 | } else { |
| 973 | /* record not found, but not probing. Maybe stretch wrong ? Restart probing */ |
| 974 | if (unit[SelectedDrive].autoprobe) { |
| 975 | unit[SelectedDrive].disktype = disk_type + NUM_DISK_TYPES - 1; |
| 976 | set_capacity(disks[SelectedDrive], |
| 977 | unit[SelectedDrive].disktype->blocks); |
| 978 | Probing = 1; |
| 979 | } |
| 980 | } |
| 981 | if (Probing) { |
| 982 | setup_req_params(SelectedDrive); |
| 983 | #ifdef TRACKBUFFER |
| 984 | BufferDrive = -1; |
| 985 | #endif |
| 986 | do_fd_action(SelectedDrive); |
| 987 | return; |
| 988 | } |
| 989 | printk("fd%d: sector %d not found (side %d, track %d)\n", |
| 990 | SelectedDrive, FDC1772_READ(FDC1772REG_SECTOR), ReqSide, ReqTrack); |
| 991 | goto err_end; |
| 992 | } |
| 993 | if (status & FDC1772STAT_CRC) { |
| 994 | printk("fd%d: CRC error (side %d, track %d, sector %d)\n", |
| 995 | SelectedDrive, ReqSide, ReqTrack, FDC1772_READ(FDC1772REG_SECTOR)); |
| 996 | goto err_end; |
| 997 | } |
| 998 | if (status & FDC1772STAT_LOST) { |
| 999 | printk("fd%d: lost data (side %d, track %d, sector %d)\n", |
| 1000 | SelectedDrive, ReqSide, ReqTrack, FDC1772_READ(FDC1772REG_SECTOR)); |
| 1001 | goto err_end; |
| 1002 | } |
| 1003 | Probing = 0; |
| 1004 | |
| 1005 | if (ReqCmd == READ) { |
| 1006 | #ifdef TRACKBUFFER |
| 1007 | if (!read_track) { |
| 1008 | /*cache_clear (PhysDMABuffer, 512);*/ |
| 1009 | copy_buffer (DMABuffer, ReqData); |
| 1010 | } else { |
| 1011 | /*cache_clear (PhysTrackBuffer, FD1772_MAX_SECTORS * 512);*/ |
| 1012 | BufferDrive = SelectedDrive; |
| 1013 | BufferSide = ReqSide; |
| 1014 | BufferTrack = ReqTrack; |
| 1015 | copy_buffer (SECTOR_BUFFER (ReqSector), ReqData); |
| 1016 | } |
| 1017 | #else |
| 1018 | /*cache_clear( PhysDMABuffer, 512 ); */ |
| 1019 | copy_buffer(DMABuffer, ReqData); |
| 1020 | #endif |
| 1021 | } |
| 1022 | if (++ReqCnt < CURRENT->current_nr_sectors) { |
| 1023 | /* read next sector */ |
| 1024 | setup_req_params(SelectedDrive); |
| 1025 | do_fd_action(SelectedDrive); |
| 1026 | } else { |
| 1027 | /* all sectors finished */ |
| 1028 | CURRENT->nr_sectors -= CURRENT->current_nr_sectors; |
| 1029 | CURRENT->sector += CURRENT->current_nr_sectors; |
| 1030 | end_request(CURRENT, 1); |
| 1031 | redo_fd_request(); |
| 1032 | } |
| 1033 | return; |
| 1034 | |
| 1035 | err_end: |
| 1036 | #ifdef TRACKBUFFER |
| 1037 | BufferDrive = -1; |
| 1038 | #endif |
| 1039 | |
| 1040 | fd_error(); |
| 1041 | } |
| 1042 | |
| 1043 | |
| 1044 | static void fd_times_out(unsigned long dummy) |
| 1045 | { |
| 1046 | SET_IRQ_HANDLER(NULL); |
| 1047 | /* If the timeout occurred while the readtrack_check timer was |
| 1048 | * active, we need to cancel it, else bad things will happen */ |
| 1049 | del_timer( &readtrack_timer ); |
| 1050 | FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_FORCI); |
| 1051 | udelay(25); |
| 1052 | |
| 1053 | printk("floppy timeout\n"); |
| 1054 | STOP_TIMEOUT(); /* hmm - should we do this ? */ |
| 1055 | fd_error(); |
| 1056 | } |
| 1057 | |
| 1058 | |
| 1059 | /* The (noop) seek operation here is needed to make the WP bit in the |
| 1060 | * FDC1772 status register accessible for check_change. If the last disk |
| 1061 | * operation would have been a RDSEC, this bit would always read as 0 |
| 1062 | * no matter what :-( To save time, the seek goes to the track we're |
| 1063 | * already on. |
| 1064 | */ |
| 1065 | |
| 1066 | static void finish_fdc(void) |
| 1067 | { |
| 1068 | /* DAG - just try without this dummy seek! */ |
| 1069 | finish_fdc_done(0); |
| 1070 | return; |
| 1071 | |
| 1072 | if (!NeedSeek) { |
| 1073 | finish_fdc_done(0); |
| 1074 | } else { |
| 1075 | DPRINT(("finish_fdc: dummy seek started\n")); |
| 1076 | FDC1772_WRITE(FDC1772REG_DATA, unit[SelectedDrive].track); |
| 1077 | SET_IRQ_HANDLER(finish_fdc_done); |
| 1078 | FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_SEEK); |
| 1079 | MotorOn = 1; |
| 1080 | START_TIMEOUT(); |
| 1081 | /* we must wait for the IRQ here, because the ST-DMA is |
| 1082 | * released immediately afterwards and the interrupt may be |
| 1083 | * delivered to the wrong driver. |
| 1084 | */ |
| 1085 | } |
| 1086 | } |
| 1087 | |
| 1088 | |
| 1089 | static void finish_fdc_done(int dummy) |
| 1090 | { |
| 1091 | unsigned long flags; |
| 1092 | |
| 1093 | DPRINT(("finish_fdc_done entered\n")); |
| 1094 | STOP_TIMEOUT(); |
| 1095 | NeedSeek = 0; |
| 1096 | |
| 1097 | if (timer_pending(&fd_timer) && |
| 1098 | time_after(jiffies + 5, fd_timer.expires)) |
| 1099 | /* If the check for a disk change is done too early after this |
| 1100 | * last seek command, the WP bit still reads wrong :-(( |
| 1101 | */ |
| 1102 | mod_timer(&fd_timer, jiffies + 5); |
| 1103 | else { |
| 1104 | /* START_CHECK_CHANGE_TIMER( CHECK_CHANGE_DELAY ); */ |
| 1105 | }; |
| 1106 | del_timer(&motor_off_timer); |
| 1107 | START_MOTOR_OFF_TIMER(FD_MOTOR_OFF_DELAY); |
| 1108 | |
| 1109 | save_flags(flags); |
| 1110 | cli(); |
| 1111 | /* stdma_release(); - not sure if I should do something DAG */ |
| 1112 | fdc_busy = 0; |
| 1113 | wake_up(&fdc_wait); |
| 1114 | restore_flags(flags); |
| 1115 | |
| 1116 | DPRINT(("finish_fdc() finished\n")); |
| 1117 | } |
| 1118 | |
| 1119 | |
| 1120 | /* Prevent "aliased" accesses. */ |
| 1121 | static int fd_ref[4]; |
| 1122 | static int fd_device[4]; |
| 1123 | |
| 1124 | /* dummy for blk.h */ |
| 1125 | static void floppy_off(unsigned int nr) |
| 1126 | { |
| 1127 | } |
| 1128 | |
| 1129 | |
| 1130 | /* On the old arcs write protect depends on the particular model |
| 1131 | of machine. On the A310, R140, and A440 there is a disc changed |
| 1132 | detect, however on the A4x0/1 range there is not. There |
| 1133 | is nothing to tell you which machine your on. |
| 1134 | At the moment I'm just marking changed always. I've |
| 1135 | left the Atari's 'change on write protect change' code in this |
| 1136 | part (but nothing sets it). |
| 1137 | RiscOS apparently checks the disc serial number etc. to detect changes |
| 1138 | - but if it sees a disc change line go high (?) it flips to using |
| 1139 | it. Well maybe I'll add that in the future (!?) |
| 1140 | */ |
| 1141 | static int check_floppy_change(struct gendisk *disk) |
| 1142 | { |
| 1143 | struct archy_floppy_struct *p = disk->private_data; |
| 1144 | unsigned int drive = p - unit; |
| 1145 | |
| 1146 | if (test_bit(drive, &fake_change)) { |
| 1147 | /* simulated change (e.g. after formatting) */ |
| 1148 | return 1; |
| 1149 | } |
| 1150 | if (test_bit(drive, &changed_floppies)) { |
| 1151 | /* surely changed (the WP signal changed at least once) */ |
| 1152 | return 1; |
| 1153 | } |
| 1154 | if (p->wpstat) { |
| 1155 | /* WP is on -> could be changed: to be sure, buffers should be |
| 1156 | * invalidated... |
| 1157 | */ |
| 1158 | return 1; |
| 1159 | } |
| 1160 | return 1; /* DAG - was 0 */ |
| 1161 | } |
| 1162 | |
| 1163 | static int floppy_revalidate(struct gendisk *disk) |
| 1164 | { |
| 1165 | struct archy_floppy_struct *p = disk->private_data; |
| 1166 | unsigned int drive = p - unit; |
| 1167 | |
| 1168 | if (test_bit(drive, &changed_floppies) || test_bit(drive, &fake_change) |
| 1169 | || unit[drive].disktype == 0) { |
| 1170 | #ifdef TRACKBUFFER |
| 1171 | BufferDrive = -1; |
| 1172 | #endif |
| 1173 | clear_bit(drive, &fake_change); |
| 1174 | clear_bit(drive, &changed_floppies); |
| 1175 | p->disktype = 0; |
| 1176 | } |
| 1177 | return 0; |
| 1178 | } |
| 1179 | |
| 1180 | /* This sets up the global variables describing the current request. */ |
| 1181 | |
| 1182 | static void setup_req_params(int drive) |
| 1183 | { |
| 1184 | int block = ReqBlock + ReqCnt; |
| 1185 | |
| 1186 | ReqTrack = block / unit[drive].disktype->spt; |
| 1187 | ReqSector = block - ReqTrack * unit[drive].disktype->spt + 1; |
| 1188 | ReqSide = ReqTrack & 1; |
| 1189 | ReqTrack >>= 1; |
| 1190 | ReqData = ReqBuffer + 512 * ReqCnt; |
| 1191 | |
| 1192 | #ifdef TRACKBUFFER |
| 1193 | read_track = (ReqCmd == READ && CURRENT->errors == 0); |
| 1194 | #endif |
| 1195 | |
| 1196 | DPRINT(("Request params: Si=%d Tr=%d Se=%d Data=%08lx\n", ReqSide, |
| 1197 | ReqTrack, ReqSector, (unsigned long) ReqData)); |
| 1198 | } |
| 1199 | |
| 1200 | |
| 1201 | static void redo_fd_request(void) |
| 1202 | { |
| 1203 | int drive, type; |
| 1204 | struct archy_floppy_struct *floppy; |
| 1205 | |
| 1206 | DPRINT(("redo_fd_request: CURRENT=%p dev=%s CURRENT->sector=%ld\n", |
| 1207 | CURRENT, CURRENT ? CURRENT->rq_disk->disk_name : "", |
| 1208 | CURRENT ? CURRENT->sector : 0)); |
| 1209 | |
| 1210 | repeat: |
| 1211 | |
| 1212 | if (!CURRENT) |
| 1213 | goto the_end; |
| 1214 | |
| 1215 | floppy = CURRENT->rq_disk->private_data; |
| 1216 | drive = floppy - unit; |
| 1217 | type = fd_device[drive]; |
| 1218 | |
| 1219 | if (!floppy->connected) { |
| 1220 | /* drive not connected */ |
| 1221 | printk("Unknown Device: fd%d\n", drive); |
| 1222 | end_request(CURRENT, 0); |
| 1223 | goto repeat; |
| 1224 | } |
| 1225 | if (type == 0) { |
| 1226 | if (!floppy->disktype) { |
| 1227 | Probing = 1; |
| 1228 | floppy->disktype = disk_type + NUM_DISK_TYPES - 1; |
| 1229 | set_capacity(disks[drive], floppy->disktype->blocks); |
| 1230 | floppy->autoprobe = 1; |
| 1231 | } |
| 1232 | } else { |
| 1233 | /* user supplied disk type */ |
| 1234 | --type; |
| 1235 | if (type >= NUM_DISK_TYPES) { |
| 1236 | printk("fd%d: invalid disk format", drive); |
| 1237 | end_request(CURRENT, 0); |
| 1238 | goto repeat; |
| 1239 | } |
| 1240 | floppy->disktype = &disk_type[type]; |
| 1241 | set_capacity(disks[drive], floppy->disktype->blocks); |
| 1242 | floppy->autoprobe = 0; |
| 1243 | } |
| 1244 | |
| 1245 | if (CURRENT->sector + 1 > floppy->disktype->blocks) { |
| 1246 | end_request(CURRENT, 0); |
| 1247 | goto repeat; |
| 1248 | } |
| 1249 | /* stop deselect timer */ |
| 1250 | del_timer(&motor_off_timer); |
| 1251 | |
| 1252 | ReqCnt = 0; |
| 1253 | ReqCmd = CURRENT->cmd; |
| 1254 | ReqBlock = CURRENT->sector; |
| 1255 | ReqBuffer = CURRENT->buffer; |
| 1256 | setup_req_params(drive); |
| 1257 | do_fd_action(drive); |
| 1258 | |
| 1259 | return; |
| 1260 | |
| 1261 | the_end: |
| 1262 | finish_fdc(); |
| 1263 | } |
| 1264 | |
| 1265 | static void fd1772_checkint(void) |
| 1266 | { |
| 1267 | extern int fdc1772_bytestogo; |
| 1268 | |
| 1269 | /*printk("fd1772_checkint %d\n",fdc1772_fdc_int_done);*/ |
| 1270 | if (fdc1772_fdc_int_done) |
| 1271 | floppy_irqconsequencehandler(); |
| 1272 | if ((MultReadInProgress) && (fdc1772_bytestogo==0)) fd_readtrack_check(0); |
| 1273 | if (fdc_busy) { |
| 1274 | schedule_work(&fd1772_tq); |
| 1275 | } |
| 1276 | } |
| 1277 | |
| 1278 | static void do_fd_request(request_queue_t* q) |
| 1279 | { |
| 1280 | unsigned long flags; |
| 1281 | |
| 1282 | DPRINT(("do_fd_request for pid %d\n", current->pid)); |
| 1283 | if (fdc_busy) return; |
| 1284 | save_flags(flags); |
| 1285 | cli(); |
Christoph Hellwig | 71abe99 | 2005-08-07 14:23:42 +0100 | [diff] [blame^] | 1286 | wait_event(fdc_wait, !fdc_busy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1287 | fdc_busy = 1; |
| 1288 | ENABLE_IRQ(); |
| 1289 | restore_flags(flags); |
| 1290 | |
| 1291 | fdc1772_fdc_int_done = 0; |
| 1292 | |
| 1293 | redo_fd_request(); |
| 1294 | |
| 1295 | schedule_work(&fd1772_tq); |
| 1296 | } |
| 1297 | |
| 1298 | |
| 1299 | static int invalidate_drive(struct block_device *bdev) |
| 1300 | { |
| 1301 | struct archy_floppy_struct *p = bdev->bd_disk->private_data; |
| 1302 | /* invalidate the buffer track to force a reread */ |
| 1303 | #ifdef TRACKBUFFER |
| 1304 | BufferDrive = -1; |
| 1305 | #endif |
| 1306 | |
| 1307 | set_bit(p - unit, &fake_change); |
| 1308 | return 0; |
| 1309 | } |
| 1310 | |
| 1311 | static int fd_ioctl(struct inode *inode, struct file *filp, |
| 1312 | unsigned int cmd, unsigned long param) |
| 1313 | { |
| 1314 | struct block_device *bdev = inode->i_bdev; |
| 1315 | |
| 1316 | switch (cmd) { |
| 1317 | case FDFMTEND: |
| 1318 | case FDFLUSH: |
| 1319 | invalidate_drive(bdev); |
| 1320 | check_disk_change(bdev); |
| 1321 | case FDFMTBEG: |
| 1322 | return 0; |
| 1323 | default: |
| 1324 | return -EINVAL; |
| 1325 | } |
| 1326 | } |
| 1327 | |
| 1328 | |
| 1329 | /* Initialize the 'unit' variable for drive 'drive' */ |
| 1330 | |
| 1331 | static void fd_probe(int drive) |
| 1332 | { |
| 1333 | unit[drive].connected = 0; |
| 1334 | unit[drive].disktype = NULL; |
| 1335 | |
| 1336 | if (!fd_test_drive_present(drive)) |
| 1337 | return; |
| 1338 | |
| 1339 | unit[drive].connected = 1; |
| 1340 | unit[drive].track = -1; /* If we put the auto detect back in this can go to 0 */ |
| 1341 | unit[drive].steprate = FDC1772STEP_6; |
| 1342 | MotorOn = 1; /* from probe restore operation! */ |
| 1343 | } |
| 1344 | |
| 1345 | |
| 1346 | /* This function tests the physical presence of a floppy drive (not |
| 1347 | * whether a disk is inserted). This is done by issuing a restore |
| 1348 | * command, waiting max. 2 seconds (that should be enough to move the |
| 1349 | * head across the whole disk) and looking at the state of the "TR00" |
| 1350 | * signal. This should now be raised if there is a drive connected |
| 1351 | * (and there is no hardware failure :-) Otherwise, the drive is |
| 1352 | * declared absent. |
| 1353 | */ |
| 1354 | |
| 1355 | static int fd_test_drive_present(int drive) |
| 1356 | { |
| 1357 | unsigned long timeout; |
| 1358 | unsigned char status; |
| 1359 | int ok; |
| 1360 | |
| 1361 | printk("fd_test_drive_present %d\n", drive); |
| 1362 | if (drive > 1) |
| 1363 | return (0); |
| 1364 | return (1); /* Simple hack for the moment - the autodetect doesn't seem to work on arc */ |
| 1365 | fd_select_drive(drive); |
| 1366 | |
| 1367 | /* disable interrupt temporarily */ |
| 1368 | DISABLE_IRQ(); |
| 1369 | FDC1772_WRITE(FDC1772REG_TRACK, 0x00); /* was ff00 why? */ |
| 1370 | FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_RESTORE | FDC1772CMDADD_H | FDC1772STEP_6); |
| 1371 | |
| 1372 | /*printk("fd_test_drive_present: Going into timeout loop\n"); */ |
| 1373 | for (ok = 0, timeout = jiffies + 2 * HZ + HZ / 2; time_before(jiffies, timeout);) { |
| 1374 | /* What does this piece of atariism do? - query for an interrupt? */ |
| 1375 | /* if (!(mfp.par_dt_reg & 0x20)) |
| 1376 | break; */ |
| 1377 | /* Well this is my nearest guess - quit when we get an FDC interrupt */ |
| 1378 | if (ioc_readb(IOC_FIQSTAT) & 2) |
| 1379 | break; |
| 1380 | } |
| 1381 | |
| 1382 | /*printk("fd_test_drive_present: Coming out of timeout loop\n"); */ |
| 1383 | status = FDC1772_READ(FDC1772REG_STATUS); |
| 1384 | ok = (status & FDC1772STAT_TR00) != 0; |
| 1385 | |
| 1386 | /*printk("fd_test_drive_present: ok=%d\n",ok); */ |
| 1387 | /* force interrupt to abort restore operation (FDC1772 would try |
| 1388 | * about 50 seconds!) */ |
| 1389 | FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_FORCI); |
| 1390 | udelay(500); |
| 1391 | status = FDC1772_READ(FDC1772REG_STATUS); |
| 1392 | udelay(20); |
| 1393 | /*printk("fd_test_drive_present: just before OK code %d\n",ok); */ |
| 1394 | |
| 1395 | if (ok) { |
| 1396 | /* dummy seek command to make WP bit accessible */ |
| 1397 | FDC1772_WRITE(FDC1772REG_DATA, 0); |
| 1398 | FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_SEEK); |
| 1399 | printk("fd_test_drive_present: just before wait for int\n"); |
| 1400 | /* DAG: Guess means wait for interrupt */ |
| 1401 | while (!(ioc_readb(IOC_FIQSTAT) & 2)); |
| 1402 | printk("fd_test_drive_present: just after wait for int\n"); |
| 1403 | status = FDC1772_READ(FDC1772REG_STATUS); |
| 1404 | } |
| 1405 | printk("fd_test_drive_present: just before ENABLE_IRQ\n"); |
| 1406 | ENABLE_IRQ(); |
| 1407 | printk("fd_test_drive_present: about to return\n"); |
| 1408 | return (ok); |
| 1409 | } |
| 1410 | |
| 1411 | |
| 1412 | /* Look how many and which kind of drives are connected. If there are |
| 1413 | * floppies, additionally start the disk-change and motor-off timers. |
| 1414 | */ |
| 1415 | |
| 1416 | static void config_types(void) |
| 1417 | { |
| 1418 | int drive, cnt = 0; |
| 1419 | |
| 1420 | printk("Probing floppy drive(s):\n"); |
| 1421 | for (drive = 0; drive < FD_MAX_UNITS; drive++) { |
| 1422 | fd_probe(drive); |
| 1423 | if (unit[drive].connected) { |
| 1424 | printk("fd%d\n", drive); |
| 1425 | ++cnt; |
| 1426 | } |
| 1427 | } |
| 1428 | |
| 1429 | if (FDC1772_READ(FDC1772REG_STATUS) & FDC1772STAT_BUSY) { |
| 1430 | /* If FDC1772 is still busy from probing, give it another FORCI |
| 1431 | * command to abort the operation. If this isn't done, the FDC1772 |
| 1432 | * will interrupt later and its IRQ line stays low, because |
| 1433 | * the status register isn't read. And this will block any |
| 1434 | * interrupts on this IRQ line :-( |
| 1435 | */ |
| 1436 | FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_FORCI); |
| 1437 | udelay(500); |
| 1438 | FDC1772_READ(FDC1772REG_STATUS); |
| 1439 | udelay(20); |
| 1440 | } |
| 1441 | if (cnt > 0) { |
| 1442 | START_MOTOR_OFF_TIMER(FD_MOTOR_OFF_DELAY); |
| 1443 | if (cnt == 1) |
| 1444 | fd_select_drive(0); |
| 1445 | /*START_CHECK_CHANGE_TIMER( CHECK_CHANGE_DELAY ); */ |
| 1446 | } |
| 1447 | } |
| 1448 | |
| 1449 | /* |
| 1450 | * floppy_open check for aliasing (/dev/fd0 can be the same as |
| 1451 | * /dev/PS0 etc), and disallows simultaneous access to the same |
| 1452 | * drive with different device numbers. |
| 1453 | */ |
| 1454 | |
| 1455 | static int floppy_open(struct inode *inode, struct file *filp) |
| 1456 | { |
| 1457 | int drive = iminor(inode) & 3; |
| 1458 | int type = iminor(inode) >> 2; |
| 1459 | int old_dev = fd_device[drive]; |
| 1460 | |
| 1461 | if (fd_ref[drive] && old_dev != type) |
| 1462 | return -EBUSY; |
| 1463 | |
| 1464 | if (fd_ref[drive] == -1 || (fd_ref[drive] && filp->f_flags & O_EXCL)) |
| 1465 | return -EBUSY; |
| 1466 | |
| 1467 | if (filp->f_flags & O_EXCL) |
| 1468 | fd_ref[drive] = -1; |
| 1469 | else |
| 1470 | fd_ref[drive]++; |
| 1471 | |
| 1472 | fd_device[drive] = type; |
| 1473 | |
| 1474 | if (filp->f_flags & O_NDELAY) |
| 1475 | return 0; |
| 1476 | |
| 1477 | if (filp->f_mode & 3) { |
| 1478 | check_disk_change(inode->i_bdev); |
| 1479 | if (filp->f_mode & 2) { |
| 1480 | if (unit[drive].wpstat) { |
| 1481 | floppy_release(inode, filp); |
| 1482 | return -EROFS; |
| 1483 | } |
| 1484 | } |
| 1485 | } |
| 1486 | return 0; |
| 1487 | } |
| 1488 | |
| 1489 | |
| 1490 | static int floppy_release(struct inode *inode, struct file *filp) |
| 1491 | { |
| 1492 | int drive = iminor(inode) & 3; |
| 1493 | |
| 1494 | if (fd_ref[drive] < 0) |
| 1495 | fd_ref[drive] = 0; |
| 1496 | else if (!fd_ref[drive]--) { |
| 1497 | printk("floppy_release with fd_ref == 0"); |
| 1498 | fd_ref[drive] = 0; |
| 1499 | } |
| 1500 | |
| 1501 | return 0; |
| 1502 | } |
| 1503 | |
| 1504 | static struct block_device_operations floppy_fops = |
| 1505 | { |
| 1506 | .open = floppy_open, |
| 1507 | .release = floppy_release, |
| 1508 | .ioctl = fd_ioctl, |
| 1509 | .media_changed = check_floppy_change, |
| 1510 | .revalidate_disk= floppy_revalidate, |
| 1511 | }; |
| 1512 | |
| 1513 | static struct kobject *floppy_find(dev_t dev, int *part, void *data) |
| 1514 | { |
| 1515 | int drive = *part & 3; |
| 1516 | if ((*part >> 2) > NUM_DISK_TYPES || drive >= FD_MAX_UNITS) |
| 1517 | return NULL; |
| 1518 | *part = 0; |
| 1519 | return get_disk(disks[drive]); |
| 1520 | } |
| 1521 | |
| 1522 | int fd1772_init(void) |
| 1523 | { |
| 1524 | static DEFINE_SPINLOCK(lock); |
| 1525 | int i, err = -ENOMEM; |
| 1526 | |
| 1527 | if (!machine_is_archimedes()) |
| 1528 | return 0; |
| 1529 | |
| 1530 | for (i = 0; i < FD_MAX_UNITS; i++) { |
| 1531 | disks[i] = alloc_disk(1); |
| 1532 | if (!disks[i]) |
| 1533 | goto err_disk; |
| 1534 | } |
| 1535 | |
| 1536 | err = register_blkdev(MAJOR_NR, "fd"); |
| 1537 | if (err) |
| 1538 | goto err_disk; |
| 1539 | |
| 1540 | err = -EBUSY; |
| 1541 | if (request_dma(FLOPPY_DMA, "fd1772")) { |
| 1542 | printk("Unable to grab DMA%d for the floppy (1772) driver\n", FLOPPY_DMA); |
| 1543 | goto err_blkdev; |
| 1544 | }; |
| 1545 | |
| 1546 | if (request_dma(FIQ_FD1772, "fd1772 end")) { |
| 1547 | printk("Unable to grab DMA%d for the floppy (1772) driver\n", FIQ_FD1772); |
| 1548 | goto err_dma1; |
| 1549 | }; |
| 1550 | |
| 1551 | /* initialize variables */ |
| 1552 | SelectedDrive = -1; |
| 1553 | #ifdef TRACKBUFFER |
| 1554 | BufferDrive = BufferSide = BufferTrack = -1; |
| 1555 | /* Atari uses 512 - I want to eventually cope with 1K sectors */ |
| 1556 | DMABuffer = (char *)kmalloc((FD1772_MAX_SECTORS+1)*512,GFP_KERNEL); |
| 1557 | TrackBuffer = DMABuffer + 512; |
| 1558 | #else |
| 1559 | /* Allocate memory for the DMAbuffer - on the Atari this takes it |
| 1560 | out of some special memory... */ |
| 1561 | DMABuffer = (char *) kmalloc(2048); /* Copes with pretty large sectors */ |
| 1562 | #endif |
| 1563 | err = -ENOMEM; |
| 1564 | if (!DMAbuffer) |
| 1565 | goto err_dma2; |
| 1566 | |
| 1567 | enable_dma(FIQ_FD1772); /* This inserts a call to our command end routine */ |
| 1568 | |
| 1569 | floppy_queue = blk_init_queue(do_fd_request, &lock); |
| 1570 | if (!floppy_queue) |
| 1571 | goto err_queue; |
| 1572 | |
| 1573 | for (i = 0; i < FD_MAX_UNITS; i++) { |
| 1574 | unit[i].track = -1; |
| 1575 | disks[i]->major = MAJOR_NR; |
| 1576 | disks[i]->first_minor = 0; |
| 1577 | disks[i]->fops = &floppy_fops; |
| 1578 | sprintf(disks[i]->disk_name, "fd%d", i); |
| 1579 | disks[i]->private_data = &unit[i]; |
| 1580 | disks[i]->queue = floppy_queue; |
| 1581 | set_capacity(disks[i], MAX_DISK_SIZE * 2); |
| 1582 | } |
| 1583 | blk_register_region(MKDEV(MAJOR_NR, 0), 256, THIS_MODULE, |
| 1584 | floppy_find, NULL, NULL); |
| 1585 | |
| 1586 | for (i = 0; i < FD_MAX_UNITS; i++) |
| 1587 | add_disk(disks[i]); |
| 1588 | |
| 1589 | config_types(); |
| 1590 | |
| 1591 | return 0; |
| 1592 | |
| 1593 | err_queue: |
| 1594 | kfree(DMAbuffer); |
| 1595 | err_dma2: |
| 1596 | free_dma(FIQ_FD1772); |
| 1597 | |
| 1598 | err_dma1: |
| 1599 | free_dma(FLOPPY_DMA); |
| 1600 | |
| 1601 | err_blkdev: |
| 1602 | unregister_blkdev(MAJOR_NR, "fd"); |
| 1603 | |
| 1604 | err_disk: |
| 1605 | while (i--) |
| 1606 | put_disk(disks[i]); |
| 1607 | return err; |
| 1608 | } |