1 /* 2 * linux/drivers/block/floppy.c 3 * 4 * Copyright (C) 1991, 1992 Linus Torvalds 5 * Copyright (C) 1993, 1994 Alain Knaff 6 * Copyright (C) 1998 Alan Cox 7 */ 8 9 /* 10 * 02.12.91 - Changed to static variables to indicate need for reset 11 * and recalibrate. This makes some things easier (output_byte reset 12 * checking etc), and means less interrupt jumping in case of errors, 13 * so the code is hopefully easier to understand. 14 */ 15 16 /* 17 * This file is certainly a mess. I've tried my best to get it working, 18 * but I don't like programming floppies, and I have only one anyway. 19 * Urgel. I should check for more errors, and do more graceful error 20 * recovery. Seems there are problems with several drives. I've tried to 21 * correct them. No promises. 22 */ 23 24 /* 25 * As with hd.c, all routines within this file can (and will) be called 26 * by interrupts, so extreme caution is needed. A hardware interrupt 27 * handler may not sleep, or a kernel panic will happen. Thus I cannot 28 * call "floppy-on" directly, but have to set a special timer interrupt 29 * etc. 30 */ 31 32 /* 33 * 28.02.92 - made track-buffering routines, based on the routines written 34 * by entropy@wintermute.wpi.edu (Lawrence Foard). Linus. 35 */ 36 37 /* 38 * Automatic floppy-detection and formatting written by Werner Almesberger 39 * (almesber@nessie.cs.id.ethz.ch), who also corrected some problems with 40 * the floppy-change signal detection. 41 */ 42 43 /* 44 * 1992/7/22 -- Hennus Bergman: Added better error reporting, fixed 45 * FDC data overrun bug, added some preliminary stuff for vertical 46 * recording support. 47 * 48 * 1992/9/17: Added DMA allocation & DMA functions. -- hhb. 49 * 50 * TODO: Errors are still not counted properly. 51 */ 52 53 /* 1992/9/20 54 * Modifications for ``Sector Shifting'' by Rob Hooft (hooft@chem.ruu.nl) 55 * modeled after the freeware MS-DOS program fdformat/88 V1.8 by 56 * Christoph H. Hochst\"atter. 57 * I have fixed the shift values to the ones I always use. Maybe a new 58 * ioctl() should be created to be able to modify them. 59 * There is a bug in the driver that makes it impossible to format a 60 * floppy as the first thing after bootup. 61 */ 62 63 /* 64 * 1993/4/29 -- Linus -- cleaned up the timer handling in the kernel, and 65 * this helped the floppy driver as well. Much cleaner, and still seems to 66 * work. 67 */ 68 69 /* 1994/6/24 --bbroad-- added the floppy table entries and made 70 * minor modifications to allow 2.88 floppies to be run. 71 */ 72 73 /* 1994/7/13 -- Paul Vojta -- modified the probing code to allow three or more 74 * disk types. 75 */ 76 77 /* 78 * 1994/8/8 -- Alain Knaff -- Switched to fdpatch driver: Support for bigger 79 * format bug fixes, but unfortunately some new bugs too... 80 */ 81 82 /* 1994/9/17 -- Koen Holtman -- added logging of physical floppy write 83 * errors to allow safe writing by specialized programs. 84 */ 85 86 /* 1995/4/24 -- Dan Fandrich -- added support for Commodore 1581 3.5" disks 87 * by defining bit 1 of the "stretch" parameter to mean put sectors on the 88 * opposite side of the disk, leaving the sector IDs alone (i.e. Commodore's 89 * drives are "upside-down"). 90 */ 91 92 /* 93 * 1995/8/26 -- Andreas Busse -- added Mips support. 94 */ 95 96 /* 97 * 1995/10/18 -- Ralf Baechle -- Portability cleanup; move machine dependent 98 * features to asm/floppy.h. 99 */ 100 101 /* 102 * 1998/1/21 -- Richard Gooch <rgooch@atnf.csiro.au> -- devfs support 103 */ 104 105 /* 106 * 1998/05/07 -- Russell King -- More portability cleanups; moved definition of 107 * interrupt and dma channel to asm/floppy.h. Cleaned up some formatting & 108 * use of '0' for NULL. 109 */ 110 111 /* 112 * 1998/06/07 -- Alan Cox -- Merged the 2.0.34 fixes for resource allocation 113 * failures. 114 */ 115 116 /* 117 * 1998/09/20 -- David Weinehall -- Added slow-down code for buggy PS/2-drives. 118 */ 119 120 /* 121 * 1999/08/13 -- Paul Slootman -- floppy stopped working on Alpha after 24 122 * days, 6 hours, 32 minutes and 32 seconds (i.e. MAXINT jiffies; ints were 123 * being used to store jiffies, which are unsigned longs). 124 */ 125 126 /* 127 * 2000/08/28 -- Arnaldo Carvalho de Melo <acme@conectiva.com.br> 128 * - get rid of check_region 129 * - s/suser/capable/ 130 */ 131 132 /* 133 * 2001/08/26 -- Paul Gortmaker - fix insmod oops on machines with no 134 * floppy controller (lingering task on list after module is gone... boom.) 135 */ 136 137 /* 138 * 2002/02/07 -- Anton Altaparmakov - Fix io ports reservation to correct range 139 * (0x3f2-0x3f5, 0x3f7). This fix is a bit of a hack but the proper fix 140 * requires many non-obvious changes in arch dependent code. 141 */ 142 143 /* 2003/07/28 -- Daniele Bellucci <bellucda@tiscali.it>. 144 * Better audit of register_blkdev. 145 */ 146 147 #undef FLOPPY_SILENT_DCL_CLEAR 148 149 #define REALLY_SLOW_IO 150 151 #define DEBUGT 2 152 153 #define DPRINT(format, args...) \ 154 pr_info("floppy%d: " format, current_drive, ##args) 155 156 #define DCL_DEBUG /* debug disk change line */ 157 #ifdef DCL_DEBUG 158 #define debug_dcl(test, fmt, args...) \ 159 do { if ((test) & FD_DEBUG) DPRINT(fmt, ##args); } while (0) 160 #else 161 #define debug_dcl(test, fmt, args...) \ 162 do { if (0) DPRINT(fmt, ##args); } while (0) 163 #endif 164 165 /* do print messages for unexpected interrupts */ 166 static int print_unex = 1; 167 #include <linux/module.h> 168 #include <linux/sched.h> 169 #include <linux/fs.h> 170 #include <linux/kernel.h> 171 #include <linux/timer.h> 172 #include <linux/workqueue.h> 173 #define FDPATCHES 174 #include <linux/fdreg.h> 175 #include <linux/fd.h> 176 #include <linux/hdreg.h> 177 #include <linux/errno.h> 178 #include <linux/slab.h> 179 #include <linux/mm.h> 180 #include <linux/bio.h> 181 #include <linux/string.h> 182 #include <linux/jiffies.h> 183 #include <linux/fcntl.h> 184 #include <linux/delay.h> 185 #include <linux/mc146818rtc.h> /* CMOS defines */ 186 #include <linux/ioport.h> 187 #include <linux/interrupt.h> 188 #include <linux/init.h> 189 #include <linux/platform_device.h> 190 #include <linux/mod_devicetable.h> 191 #include <linux/mutex.h> 192 #include <linux/io.h> 193 #include <linux/uaccess.h> 194 #include <linux/async.h> 195 #include <linux/compat.h> 196 197 /* 198 * PS/2 floppies have much slower step rates than regular floppies. 199 * It's been recommended that take about 1/4 of the default speed 200 * in some more extreme cases. 201 */ 202 static DEFINE_MUTEX(floppy_mutex); 203 static int slow_floppy; 204 205 #include <asm/dma.h> 206 #include <asm/irq.h> 207 208 static int FLOPPY_IRQ = 6; 209 static int FLOPPY_DMA = 2; 210 static int can_use_virtual_dma = 2; 211 /* ======= 212 * can use virtual DMA: 213 * 0 = use of virtual DMA disallowed by config 214 * 1 = use of virtual DMA prescribed by config 215 * 2 = no virtual DMA preference configured. By default try hard DMA, 216 * but fall back on virtual DMA when not enough memory available 217 */ 218 219 static int use_virtual_dma; 220 /* ======= 221 * use virtual DMA 222 * 0 using hard DMA 223 * 1 using virtual DMA 224 * This variable is set to virtual when a DMA mem problem arises, and 225 * reset back in floppy_grab_irq_and_dma. 226 * It is not safe to reset it in other circumstances, because the floppy 227 * driver may have several buffers in use at once, and we do currently not 228 * record each buffers capabilities 229 */ 230 231 static DEFINE_SPINLOCK(floppy_lock); 232 233 static unsigned short virtual_dma_port = 0x3f0; 234 irqreturn_t floppy_interrupt(int irq, void *dev_id); 235 static int set_dor(int fdc, char mask, char data); 236 237 #define K_64 0x10000 /* 64KB */ 238 239 /* the following is the mask of allowed drives. By default units 2 and 240 * 3 of both floppy controllers are disabled, because switching on the 241 * motor of these drives causes system hangs on some PCI computers. drive 242 * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if 243 * a drive is allowed. 244 * 245 * NOTE: This must come before we include the arch floppy header because 246 * some ports reference this variable from there. -DaveM 247 */ 248 249 static int allowed_drive_mask = 0x33; 250 251 #include <asm/floppy.h> 252 253 static int irqdma_allocated; 254 255 #include <linux/blkdev.h> 256 #include <linux/blkpg.h> 257 #include <linux/cdrom.h> /* for the compatibility eject ioctl */ 258 #include <linux/completion.h> 259 260 static struct request *current_req; 261 static void do_fd_request(struct request_queue *q); 262 static int set_next_request(void); 263 264 #ifndef fd_get_dma_residue 265 #define fd_get_dma_residue() get_dma_residue(FLOPPY_DMA) 266 #endif 267 268 /* Dma Memory related stuff */ 269 270 #ifndef fd_dma_mem_free 271 #define fd_dma_mem_free(addr, size) free_pages(addr, get_order(size)) 272 #endif 273 274 #ifndef fd_dma_mem_alloc 275 #define fd_dma_mem_alloc(size) __get_dma_pages(GFP_KERNEL, get_order(size)) 276 #endif 277 278 #ifndef fd_cacheflush 279 #define fd_cacheflush(addr, size) /* nothing... */ 280 #endif 281 282 static inline void fallback_on_nodma_alloc(char **addr, size_t l) 283 { 284 #ifdef FLOPPY_CAN_FALLBACK_ON_NODMA 285 if (*addr) 286 return; /* we have the memory */ 287 if (can_use_virtual_dma != 2) 288 return; /* no fallback allowed */ 289 pr_info("DMA memory shortage. Temporarily falling back on virtual DMA\n"); 290 *addr = (char *)nodma_mem_alloc(l); 291 #else 292 return; 293 #endif 294 } 295 296 /* End dma memory related stuff */ 297 298 static unsigned long fake_change; 299 static bool initialized; 300 301 #define ITYPE(x) (((x) >> 2) & 0x1f) 302 #define TOMINOR(x) ((x & 3) | ((x & 4) << 5)) 303 #define UNIT(x) ((x) & 0x03) /* drive on fdc */ 304 #define FDC(x) (((x) & 0x04) >> 2) /* fdc of drive */ 305 /* reverse mapping from unit and fdc to drive */ 306 #define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2)) 307 308 #define DP (&drive_params[current_drive]) 309 #define DRS (&drive_state[current_drive]) 310 #define DRWE (&write_errors[current_drive]) 311 #define FDCS (&fdc_state[fdc]) 312 313 #define UDP (&drive_params[drive]) 314 #define UDRS (&drive_state[drive]) 315 #define UDRWE (&write_errors[drive]) 316 #define UFDCS (&fdc_state[FDC(drive)]) 317 318 #define PH_HEAD(floppy, head) (((((floppy)->stretch & 2) >> 1) ^ head) << 2) 319 #define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH) 320 321 /* read/write */ 322 #define COMMAND (raw_cmd->cmd[0]) 323 #define DR_SELECT (raw_cmd->cmd[1]) 324 #define TRACK (raw_cmd->cmd[2]) 325 #define HEAD (raw_cmd->cmd[3]) 326 #define SECTOR (raw_cmd->cmd[4]) 327 #define SIZECODE (raw_cmd->cmd[5]) 328 #define SECT_PER_TRACK (raw_cmd->cmd[6]) 329 #define GAP (raw_cmd->cmd[7]) 330 #define SIZECODE2 (raw_cmd->cmd[8]) 331 #define NR_RW 9 332 333 /* format */ 334 #define F_SIZECODE (raw_cmd->cmd[2]) 335 #define F_SECT_PER_TRACK (raw_cmd->cmd[3]) 336 #define F_GAP (raw_cmd->cmd[4]) 337 #define F_FILL (raw_cmd->cmd[5]) 338 #define NR_F 6 339 340 /* 341 * Maximum disk size (in kilobytes). 342 * This default is used whenever the current disk size is unknown. 343 * [Now it is rather a minimum] 344 */ 345 #define MAX_DISK_SIZE 4 /* 3984 */ 346 347 /* 348 * globals used by 'result()' 349 */ 350 #define MAX_REPLIES 16 351 static unsigned char reply_buffer[MAX_REPLIES]; 352 static int inr; /* size of reply buffer, when called from interrupt */ 353 #define ST0 (reply_buffer[0]) 354 #define ST1 (reply_buffer[1]) 355 #define ST2 (reply_buffer[2]) 356 #define ST3 (reply_buffer[0]) /* result of GETSTATUS */ 357 #define R_TRACK (reply_buffer[3]) 358 #define R_HEAD (reply_buffer[4]) 359 #define R_SECTOR (reply_buffer[5]) 360 #define R_SIZECODE (reply_buffer[6]) 361 362 #define SEL_DLY (2 * HZ / 100) 363 364 /* 365 * this struct defines the different floppy drive types. 366 */ 367 static struct { 368 struct floppy_drive_params params; 369 const char *name; /* name printed while booting */ 370 } default_drive_params[] = { 371 /* NOTE: the time values in jiffies should be in msec! 372 CMOS drive type 373 | Maximum data rate supported by drive type 374 | | Head load time, msec 375 | | | Head unload time, msec (not used) 376 | | | | Step rate interval, usec 377 | | | | | Time needed for spinup time (jiffies) 378 | | | | | | Timeout for spinning down (jiffies) 379 | | | | | | | Spindown offset (where disk stops) 380 | | | | | | | | Select delay 381 | | | | | | | | | RPS 382 | | | | | | | | | | Max number of tracks 383 | | | | | | | | | | | Interrupt timeout 384 | | | | | | | | | | | | Max nonintlv. sectors 385 | | | | | | | | | | | | | -Max Errors- flags */ 386 {{0, 500, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 80, 3*HZ, 20, {3,1,2,0,2}, 0, 387 0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" }, 388 389 {{1, 300, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 40, 3*HZ, 17, {3,1,2,0,2}, 0, 390 0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/ 391 392 {{2, 500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6, 83, 3*HZ, 17, {3,1,2,0,2}, 0, 393 0, { 2, 5, 6,23,10,20,12, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/ 394 395 {{3, 250, 16, 16, 3000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0, 396 0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/ 397 398 {{4, 500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0, 399 0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/ 400 401 {{5, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0, 402 0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/ 403 404 {{6, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0, 405 0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/ 406 /* | --autodetected formats--- | | | 407 * read_track | | Name printed when booting 408 * | Native format 409 * Frequency of disk change checks */ 410 }; 411 412 static struct floppy_drive_params drive_params[N_DRIVE]; 413 static struct floppy_drive_struct drive_state[N_DRIVE]; 414 static struct floppy_write_errors write_errors[N_DRIVE]; 415 static struct timer_list motor_off_timer[N_DRIVE]; 416 static struct gendisk *disks[N_DRIVE]; 417 static struct block_device *opened_bdev[N_DRIVE]; 418 static DEFINE_MUTEX(open_lock); 419 static struct floppy_raw_cmd *raw_cmd, default_raw_cmd; 420 static int fdc_queue; 421 422 /* 423 * This struct defines the different floppy types. 424 * 425 * Bit 0 of 'stretch' tells if the tracks need to be doubled for some 426 * types (e.g. 360kB diskette in 1.2MB drive, etc.). Bit 1 of 'stretch' 427 * tells if the disk is in Commodore 1581 format, which means side 0 sectors 428 * are located on side 1 of the disk but with a side 0 ID, and vice-versa. 429 * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the 430 * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical 431 * side 0 is on physical side 0 (but with the misnamed sector IDs). 432 * 'stretch' should probably be renamed to something more general, like 433 * 'options'. 434 * 435 * Bits 2 through 9 of 'stretch' tell the number of the first sector. 436 * The LSB (bit 2) is flipped. For most disks, the first sector 437 * is 1 (represented by 0x00<<2). For some CP/M and music sampler 438 * disks (such as Ensoniq EPS 16plus) it is 0 (represented as 0x01<<2). 439 * For Amstrad CPC disks it is 0xC1 (represented as 0xC0<<2). 440 * 441 * Other parameters should be self-explanatory (see also setfdprm(8)). 442 */ 443 /* 444 Size 445 | Sectors per track 446 | | Head 447 | | | Tracks 448 | | | | Stretch 449 | | | | | Gap 1 size 450 | | | | | | Data rate, | 0x40 for perp 451 | | | | | | | Spec1 (stepping rate, head unload 452 | | | | | | | | /fmt gap (gap2) */ 453 static struct floppy_struct floppy_type[32] = { 454 { 0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL }, /* 0 no testing */ 455 { 720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360" }, /* 1 360KB PC */ 456 { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /* 2 1.2MB AT */ 457 { 720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360" }, /* 3 360KB SS 3.5" */ 458 { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720" }, /* 4 720KB 3.5" */ 459 { 720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360" }, /* 5 360KB AT */ 460 { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720" }, /* 6 720KB AT */ 461 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /* 7 1.44MB 3.5" */ 462 { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /* 8 2.88MB 3.5" */ 463 { 6240,39,2,80,0,0x1B,0x43,0xAF,0x28,"E3120" }, /* 9 3.12MB 3.5" */ 464 465 { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25" */ 466 { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5" */ 467 { 820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410" }, /* 12 410KB 5.25" */ 468 { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820" }, /* 13 820KB 3.5" */ 469 { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25" */ 470 { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5" */ 471 { 840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420" }, /* 16 420KB 5.25" */ 472 { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830" }, /* 17 830KB 3.5" */ 473 { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25" */ 474 { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5" */ 475 476 { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880" }, /* 20 880KB 5.25" */ 477 { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5" */ 478 { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5" */ 479 { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25" */ 480 { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5" */ 481 { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5" */ 482 { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5" */ 483 { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5" */ 484 { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5" */ 485 { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5" */ 486 487 { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800" }, /* 30 800KB 3.5" */ 488 { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5" */ 489 }; 490 491 #define SECTSIZE (_FD_SECTSIZE(*floppy)) 492 493 /* Auto-detection: Disk type used until the next media change occurs. */ 494 static struct floppy_struct *current_type[N_DRIVE]; 495 496 /* 497 * User-provided type information. current_type points to 498 * the respective entry of this array. 499 */ 500 static struct floppy_struct user_params[N_DRIVE]; 501 502 static sector_t floppy_sizes[256]; 503 504 static char floppy_device_name[] = "floppy"; 505 506 /* 507 * The driver is trying to determine the correct media format 508 * while probing is set. rw_interrupt() clears it after a 509 * successful access. 510 */ 511 static int probing; 512 513 /* Synchronization of FDC access. */ 514 #define FD_COMMAND_NONE -1 515 #define FD_COMMAND_ERROR 2 516 #define FD_COMMAND_OKAY 3 517 518 static volatile int command_status = FD_COMMAND_NONE; 519 static unsigned long fdc_busy; 520 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait); 521 static DECLARE_WAIT_QUEUE_HEAD(command_done); 522 523 /* Errors during formatting are counted here. */ 524 static int format_errors; 525 526 /* Format request descriptor. */ 527 static struct format_descr format_req; 528 529 /* 530 * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps 531 * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc), 532 * H is head unload time (1=16ms, 2=32ms, etc) 533 */ 534 535 /* 536 * Track buffer 537 * Because these are written to by the DMA controller, they must 538 * not contain a 64k byte boundary crossing, or data will be 539 * corrupted/lost. 540 */ 541 static char *floppy_track_buffer; 542 static int max_buffer_sectors; 543 544 static int *errors; 545 typedef void (*done_f)(int); 546 static const struct cont_t { 547 void (*interrupt)(void); 548 /* this is called after the interrupt of the 549 * main command */ 550 void (*redo)(void); /* this is called to retry the operation */ 551 void (*error)(void); /* this is called to tally an error */ 552 done_f done; /* this is called to say if the operation has 553 * succeeded/failed */ 554 } *cont; 555 556 static void floppy_ready(void); 557 static void floppy_start(void); 558 static void process_fd_request(void); 559 static void recalibrate_floppy(void); 560 static void floppy_shutdown(struct work_struct *); 561 562 static int floppy_request_regions(int); 563 static void floppy_release_regions(int); 564 static int floppy_grab_irq_and_dma(void); 565 static void floppy_release_irq_and_dma(void); 566 567 /* 568 * The "reset" variable should be tested whenever an interrupt is scheduled, 569 * after the commands have been sent. This is to ensure that the driver doesn't 570 * get wedged when the interrupt doesn't come because of a failed command. 571 * reset doesn't need to be tested before sending commands, because 572 * output_byte is automatically disabled when reset is set. 573 */ 574 static void reset_fdc(void); 575 576 /* 577 * These are global variables, as that's the easiest way to give 578 * information to interrupts. They are the data used for the current 579 * request. 580 */ 581 #define NO_TRACK -1 582 #define NEED_1_RECAL -2 583 #define NEED_2_RECAL -3 584 585 static atomic_t usage_count = ATOMIC_INIT(0); 586 587 /* buffer related variables */ 588 static int buffer_track = -1; 589 static int buffer_drive = -1; 590 static int buffer_min = -1; 591 static int buffer_max = -1; 592 593 /* fdc related variables, should end up in a struct */ 594 static struct floppy_fdc_state fdc_state[N_FDC]; 595 static int fdc; /* current fdc */ 596 597 static struct workqueue_struct *floppy_wq; 598 599 static struct floppy_struct *_floppy = floppy_type; 600 static unsigned char current_drive; 601 static long current_count_sectors; 602 static unsigned char fsector_t; /* sector in track */ 603 static unsigned char in_sector_offset; /* offset within physical sector, 604 * expressed in units of 512 bytes */ 605 606 static inline bool drive_no_geom(int drive) 607 { 608 return !current_type[drive] && !ITYPE(UDRS->fd_device); 609 } 610 611 #ifndef fd_eject 612 static inline int fd_eject(int drive) 613 { 614 return -EINVAL; 615 } 616 #endif 617 618 /* 619 * Debugging 620 * ========= 621 */ 622 #ifdef DEBUGT 623 static long unsigned debugtimer; 624 625 static inline void set_debugt(void) 626 { 627 debugtimer = jiffies; 628 } 629 630 static inline void debugt(const char *func, const char *msg) 631 { 632 if (DP->flags & DEBUGT) 633 pr_info("%s:%s dtime=%lu\n", func, msg, jiffies - debugtimer); 634 } 635 #else 636 static inline void set_debugt(void) { } 637 static inline void debugt(const char *func, const char *msg) { } 638 #endif /* DEBUGT */ 639 640 641 static DECLARE_DELAYED_WORK(fd_timeout, floppy_shutdown); 642 static const char *timeout_message; 643 644 static void is_alive(const char *func, const char *message) 645 { 646 /* this routine checks whether the floppy driver is "alive" */ 647 if (test_bit(0, &fdc_busy) && command_status < 2 && 648 !delayed_work_pending(&fd_timeout)) { 649 DPRINT("%s: timeout handler died. %s\n", func, message); 650 } 651 } 652 653 static void (*do_floppy)(void) = NULL; 654 655 #define OLOGSIZE 20 656 657 static void (*lasthandler)(void); 658 static unsigned long interruptjiffies; 659 static unsigned long resultjiffies; 660 static int resultsize; 661 static unsigned long lastredo; 662 663 static struct output_log { 664 unsigned char data; 665 unsigned char status; 666 unsigned long jiffies; 667 } output_log[OLOGSIZE]; 668 669 static int output_log_pos; 670 671 #define current_reqD -1 672 #define MAXTIMEOUT -2 673 674 static void __reschedule_timeout(int drive, const char *message) 675 { 676 unsigned long delay; 677 678 if (drive == current_reqD) 679 drive = current_drive; 680 681 if (drive < 0 || drive >= N_DRIVE) { 682 delay = 20UL * HZ; 683 drive = 0; 684 } else 685 delay = UDP->timeout; 686 687 mod_delayed_work(floppy_wq, &fd_timeout, delay); 688 if (UDP->flags & FD_DEBUG) 689 DPRINT("reschedule timeout %s\n", message); 690 timeout_message = message; 691 } 692 693 static void reschedule_timeout(int drive, const char *message) 694 { 695 unsigned long flags; 696 697 spin_lock_irqsave(&floppy_lock, flags); 698 __reschedule_timeout(drive, message); 699 spin_unlock_irqrestore(&floppy_lock, flags); 700 } 701 702 #define INFBOUND(a, b) (a) = max_t(int, a, b) 703 #define SUPBOUND(a, b) (a) = min_t(int, a, b) 704 705 /* 706 * Bottom half floppy driver. 707 * ========================== 708 * 709 * This part of the file contains the code talking directly to the hardware, 710 * and also the main service loop (seek-configure-spinup-command) 711 */ 712 713 /* 714 * disk change. 715 * This routine is responsible for maintaining the FD_DISK_CHANGE flag, 716 * and the last_checked date. 717 * 718 * last_checked is the date of the last check which showed 'no disk change' 719 * FD_DISK_CHANGE is set under two conditions: 720 * 1. The floppy has been changed after some i/o to that floppy already 721 * took place. 722 * 2. No floppy disk is in the drive. This is done in order to ensure that 723 * requests are quickly flushed in case there is no disk in the drive. It 724 * follows that FD_DISK_CHANGE can only be cleared if there is a disk in 725 * the drive. 726 * 727 * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet. 728 * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on 729 * each seek. If a disk is present, the disk change line should also be 730 * cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk 731 * change line is set, this means either that no disk is in the drive, or 732 * that it has been removed since the last seek. 733 * 734 * This means that we really have a third possibility too: 735 * The floppy has been changed after the last seek. 736 */ 737 738 static int disk_change(int drive) 739 { 740 int fdc = FDC(drive); 741 742 if (time_before(jiffies, UDRS->select_date + UDP->select_delay)) 743 DPRINT("WARNING disk change called early\n"); 744 if (!(FDCS->dor & (0x10 << UNIT(drive))) || 745 (FDCS->dor & 3) != UNIT(drive) || fdc != FDC(drive)) { 746 DPRINT("probing disk change on unselected drive\n"); 747 DPRINT("drive=%d fdc=%d dor=%x\n", drive, FDC(drive), 748 (unsigned int)FDCS->dor); 749 } 750 751 debug_dcl(UDP->flags, 752 "checking disk change line for drive %d\n", drive); 753 debug_dcl(UDP->flags, "jiffies=%lu\n", jiffies); 754 debug_dcl(UDP->flags, "disk change line=%x\n", fd_inb(FD_DIR) & 0x80); 755 debug_dcl(UDP->flags, "flags=%lx\n", UDRS->flags); 756 757 if (UDP->flags & FD_BROKEN_DCL) 758 return test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags); 759 if ((fd_inb(FD_DIR) ^ UDP->flags) & 0x80) { 760 set_bit(FD_VERIFY_BIT, &UDRS->flags); 761 /* verify write protection */ 762 763 if (UDRS->maxblock) /* mark it changed */ 764 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags); 765 766 /* invalidate its geometry */ 767 if (UDRS->keep_data >= 0) { 768 if ((UDP->flags & FTD_MSG) && 769 current_type[drive] != NULL) 770 DPRINT("Disk type is undefined after disk change\n"); 771 current_type[drive] = NULL; 772 floppy_sizes[TOMINOR(drive)] = MAX_DISK_SIZE << 1; 773 } 774 775 return 1; 776 } else { 777 UDRS->last_checked = jiffies; 778 clear_bit(FD_DISK_NEWCHANGE_BIT, &UDRS->flags); 779 } 780 return 0; 781 } 782 783 static inline int is_selected(int dor, int unit) 784 { 785 return ((dor & (0x10 << unit)) && (dor & 3) == unit); 786 } 787 788 static bool is_ready_state(int status) 789 { 790 int state = status & (STATUS_READY | STATUS_DIR | STATUS_DMA); 791 return state == STATUS_READY; 792 } 793 794 static int set_dor(int fdc, char mask, char data) 795 { 796 unsigned char unit; 797 unsigned char drive; 798 unsigned char newdor; 799 unsigned char olddor; 800 801 if (FDCS->address == -1) 802 return -1; 803 804 olddor = FDCS->dor; 805 newdor = (olddor & mask) | data; 806 if (newdor != olddor) { 807 unit = olddor & 0x3; 808 if (is_selected(olddor, unit) && !is_selected(newdor, unit)) { 809 drive = REVDRIVE(fdc, unit); 810 debug_dcl(UDP->flags, 811 "calling disk change from set_dor\n"); 812 disk_change(drive); 813 } 814 FDCS->dor = newdor; 815 fd_outb(newdor, FD_DOR); 816 817 unit = newdor & 0x3; 818 if (!is_selected(olddor, unit) && is_selected(newdor, unit)) { 819 drive = REVDRIVE(fdc, unit); 820 UDRS->select_date = jiffies; 821 } 822 } 823 return olddor; 824 } 825 826 static void twaddle(void) 827 { 828 if (DP->select_delay) 829 return; 830 fd_outb(FDCS->dor & ~(0x10 << UNIT(current_drive)), FD_DOR); 831 fd_outb(FDCS->dor, FD_DOR); 832 DRS->select_date = jiffies; 833 } 834 835 /* 836 * Reset all driver information about the current fdc. 837 * This is needed after a reset, and after a raw command. 838 */ 839 static void reset_fdc_info(int mode) 840 { 841 int drive; 842 843 FDCS->spec1 = FDCS->spec2 = -1; 844 FDCS->need_configure = 1; 845 FDCS->perp_mode = 1; 846 FDCS->rawcmd = 0; 847 for (drive = 0; drive < N_DRIVE; drive++) 848 if (FDC(drive) == fdc && (mode || UDRS->track != NEED_1_RECAL)) 849 UDRS->track = NEED_2_RECAL; 850 } 851 852 /* selects the fdc and drive, and enables the fdc's input/dma. */ 853 static void set_fdc(int drive) 854 { 855 if (drive >= 0 && drive < N_DRIVE) { 856 fdc = FDC(drive); 857 current_drive = drive; 858 } 859 if (fdc != 1 && fdc != 0) { 860 pr_info("bad fdc value\n"); 861 return; 862 } 863 set_dor(fdc, ~0, 8); 864 #if N_FDC > 1 865 set_dor(1 - fdc, ~8, 0); 866 #endif 867 if (FDCS->rawcmd == 2) 868 reset_fdc_info(1); 869 if (fd_inb(FD_STATUS) != STATUS_READY) 870 FDCS->reset = 1; 871 } 872 873 /* locks the driver */ 874 static int lock_fdc(int drive) 875 { 876 if (WARN(atomic_read(&usage_count) == 0, 877 "Trying to lock fdc while usage count=0\n")) 878 return -1; 879 880 if (wait_event_interruptible(fdc_wait, !test_and_set_bit(0, &fdc_busy))) 881 return -EINTR; 882 883 command_status = FD_COMMAND_NONE; 884 885 reschedule_timeout(drive, "lock fdc"); 886 set_fdc(drive); 887 return 0; 888 } 889 890 /* unlocks the driver */ 891 static void unlock_fdc(void) 892 { 893 if (!test_bit(0, &fdc_busy)) 894 DPRINT("FDC access conflict!\n"); 895 896 raw_cmd = NULL; 897 command_status = FD_COMMAND_NONE; 898 cancel_delayed_work(&fd_timeout); 899 do_floppy = NULL; 900 cont = NULL; 901 clear_bit(0, &fdc_busy); 902 wake_up(&fdc_wait); 903 } 904 905 /* switches the motor off after a given timeout */ 906 static void motor_off_callback(struct timer_list *t) 907 { 908 unsigned long nr = t - motor_off_timer; 909 unsigned char mask = ~(0x10 << UNIT(nr)); 910 911 if (WARN_ON_ONCE(nr >= N_DRIVE)) 912 return; 913 914 set_dor(FDC(nr), mask, 0); 915 } 916 917 /* schedules motor off */ 918 static void floppy_off(unsigned int drive) 919 { 920 unsigned long volatile delta; 921 int fdc = FDC(drive); 922 923 if (!(FDCS->dor & (0x10 << UNIT(drive)))) 924 return; 925 926 del_timer(motor_off_timer + drive); 927 928 /* make spindle stop in a position which minimizes spinup time 929 * next time */ 930 if (UDP->rps) { 931 delta = jiffies - UDRS->first_read_date + HZ - 932 UDP->spindown_offset; 933 delta = ((delta * UDP->rps) % HZ) / UDP->rps; 934 motor_off_timer[drive].expires = 935 jiffies + UDP->spindown - delta; 936 } 937 add_timer(motor_off_timer + drive); 938 } 939 940 /* 941 * cycle through all N_DRIVE floppy drives, for disk change testing. 942 * stopping at current drive. This is done before any long operation, to 943 * be sure to have up to date disk change information. 944 */ 945 static void scandrives(void) 946 { 947 int i; 948 int drive; 949 int saved_drive; 950 951 if (DP->select_delay) 952 return; 953 954 saved_drive = current_drive; 955 for (i = 0; i < N_DRIVE; i++) { 956 drive = (saved_drive + i + 1) % N_DRIVE; 957 if (UDRS->fd_ref == 0 || UDP->select_delay != 0) 958 continue; /* skip closed drives */ 959 set_fdc(drive); 960 if (!(set_dor(fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) & 961 (0x10 << UNIT(drive)))) 962 /* switch the motor off again, if it was off to 963 * begin with */ 964 set_dor(fdc, ~(0x10 << UNIT(drive)), 0); 965 } 966 set_fdc(saved_drive); 967 } 968 969 static void empty(void) 970 { 971 } 972 973 static void (*floppy_work_fn)(void); 974 975 static void floppy_work_workfn(struct work_struct *work) 976 { 977 floppy_work_fn(); 978 } 979 980 static DECLARE_WORK(floppy_work, floppy_work_workfn); 981 982 static void schedule_bh(void (*handler)(void)) 983 { 984 WARN_ON(work_pending(&floppy_work)); 985 986 floppy_work_fn = handler; 987 queue_work(floppy_wq, &floppy_work); 988 } 989 990 static void (*fd_timer_fn)(void) = NULL; 991 992 static void fd_timer_workfn(struct work_struct *work) 993 { 994 fd_timer_fn(); 995 } 996 997 static DECLARE_DELAYED_WORK(fd_timer, fd_timer_workfn); 998 999 static void cancel_activity(void) 1000 { 1001 do_floppy = NULL; 1002 cancel_delayed_work_sync(&fd_timer); 1003 cancel_work_sync(&floppy_work); 1004 } 1005 1006 /* this function makes sure that the disk stays in the drive during the 1007 * transfer */ 1008 static void fd_watchdog(void) 1009 { 1010 debug_dcl(DP->flags, "calling disk change from watchdog\n"); 1011 1012 if (disk_change(current_drive)) { 1013 DPRINT("disk removed during i/o\n"); 1014 cancel_activity(); 1015 cont->done(0); 1016 reset_fdc(); 1017 } else { 1018 cancel_delayed_work(&fd_timer); 1019 fd_timer_fn = fd_watchdog; 1020 queue_delayed_work(floppy_wq, &fd_timer, HZ / 10); 1021 } 1022 } 1023 1024 static void main_command_interrupt(void) 1025 { 1026 cancel_delayed_work(&fd_timer); 1027 cont->interrupt(); 1028 } 1029 1030 /* waits for a delay (spinup or select) to pass */ 1031 static int fd_wait_for_completion(unsigned long expires, 1032 void (*function)(void)) 1033 { 1034 if (FDCS->reset) { 1035 reset_fdc(); /* do the reset during sleep to win time 1036 * if we don't need to sleep, it's a good 1037 * occasion anyways */ 1038 return 1; 1039 } 1040 1041 if (time_before(jiffies, expires)) { 1042 cancel_delayed_work(&fd_timer); 1043 fd_timer_fn = function; 1044 queue_delayed_work(floppy_wq, &fd_timer, expires - jiffies); 1045 return 1; 1046 } 1047 return 0; 1048 } 1049 1050 static void setup_DMA(void) 1051 { 1052 unsigned long f; 1053 1054 if (raw_cmd->length == 0) { 1055 int i; 1056 1057 pr_info("zero dma transfer size:"); 1058 for (i = 0; i < raw_cmd->cmd_count; i++) 1059 pr_cont("%x,", raw_cmd->cmd[i]); 1060 pr_cont("\n"); 1061 cont->done(0); 1062 FDCS->reset = 1; 1063 return; 1064 } 1065 if (((unsigned long)raw_cmd->kernel_data) % 512) { 1066 pr_info("non aligned address: %p\n", raw_cmd->kernel_data); 1067 cont->done(0); 1068 FDCS->reset = 1; 1069 return; 1070 } 1071 f = claim_dma_lock(); 1072 fd_disable_dma(); 1073 #ifdef fd_dma_setup 1074 if (fd_dma_setup(raw_cmd->kernel_data, raw_cmd->length, 1075 (raw_cmd->flags & FD_RAW_READ) ? 1076 DMA_MODE_READ : DMA_MODE_WRITE, FDCS->address) < 0) { 1077 release_dma_lock(f); 1078 cont->done(0); 1079 FDCS->reset = 1; 1080 return; 1081 } 1082 release_dma_lock(f); 1083 #else 1084 fd_clear_dma_ff(); 1085 fd_cacheflush(raw_cmd->kernel_data, raw_cmd->length); 1086 fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ) ? 1087 DMA_MODE_READ : DMA_MODE_WRITE); 1088 fd_set_dma_addr(raw_cmd->kernel_data); 1089 fd_set_dma_count(raw_cmd->length); 1090 virtual_dma_port = FDCS->address; 1091 fd_enable_dma(); 1092 release_dma_lock(f); 1093 #endif 1094 } 1095 1096 static void show_floppy(void); 1097 1098 /* waits until the fdc becomes ready */ 1099 static int wait_til_ready(void) 1100 { 1101 int status; 1102 int counter; 1103 1104 if (FDCS->reset) 1105 return -1; 1106 for (counter = 0; counter < 10000; counter++) { 1107 status = fd_inb(FD_STATUS); 1108 if (status & STATUS_READY) 1109 return status; 1110 } 1111 if (initialized) { 1112 DPRINT("Getstatus times out (%x) on fdc %d\n", status, fdc); 1113 show_floppy(); 1114 } 1115 FDCS->reset = 1; 1116 return -1; 1117 } 1118 1119 /* sends a command byte to the fdc */ 1120 static int output_byte(char byte) 1121 { 1122 int status = wait_til_ready(); 1123 1124 if (status < 0) 1125 return -1; 1126 1127 if (is_ready_state(status)) { 1128 fd_outb(byte, FD_DATA); 1129 output_log[output_log_pos].data = byte; 1130 output_log[output_log_pos].status = status; 1131 output_log[output_log_pos].jiffies = jiffies; 1132 output_log_pos = (output_log_pos + 1) % OLOGSIZE; 1133 return 0; 1134 } 1135 FDCS->reset = 1; 1136 if (initialized) { 1137 DPRINT("Unable to send byte %x to FDC. Fdc=%x Status=%x\n", 1138 byte, fdc, status); 1139 show_floppy(); 1140 } 1141 return -1; 1142 } 1143 1144 /* gets the response from the fdc */ 1145 static int result(void) 1146 { 1147 int i; 1148 int status = 0; 1149 1150 for (i = 0; i < MAX_REPLIES; i++) { 1151 status = wait_til_ready(); 1152 if (status < 0) 1153 break; 1154 status &= STATUS_DIR | STATUS_READY | STATUS_BUSY | STATUS_DMA; 1155 if ((status & ~STATUS_BUSY) == STATUS_READY) { 1156 resultjiffies = jiffies; 1157 resultsize = i; 1158 return i; 1159 } 1160 if (status == (STATUS_DIR | STATUS_READY | STATUS_BUSY)) 1161 reply_buffer[i] = fd_inb(FD_DATA); 1162 else 1163 break; 1164 } 1165 if (initialized) { 1166 DPRINT("get result error. Fdc=%d Last status=%x Read bytes=%d\n", 1167 fdc, status, i); 1168 show_floppy(); 1169 } 1170 FDCS->reset = 1; 1171 return -1; 1172 } 1173 1174 #define MORE_OUTPUT -2 1175 /* does the fdc need more output? */ 1176 static int need_more_output(void) 1177 { 1178 int status = wait_til_ready(); 1179 1180 if (status < 0) 1181 return -1; 1182 1183 if (is_ready_state(status)) 1184 return MORE_OUTPUT; 1185 1186 return result(); 1187 } 1188 1189 /* Set perpendicular mode as required, based on data rate, if supported. 1190 * 82077 Now tested. 1Mbps data rate only possible with 82077-1. 1191 */ 1192 static void perpendicular_mode(void) 1193 { 1194 unsigned char perp_mode; 1195 1196 if (raw_cmd->rate & 0x40) { 1197 switch (raw_cmd->rate & 3) { 1198 case 0: 1199 perp_mode = 2; 1200 break; 1201 case 3: 1202 perp_mode = 3; 1203 break; 1204 default: 1205 DPRINT("Invalid data rate for perpendicular mode!\n"); 1206 cont->done(0); 1207 FDCS->reset = 1; 1208 /* 1209 * convenient way to return to 1210 * redo without too much hassle 1211 * (deep stack et al.) 1212 */ 1213 return; 1214 } 1215 } else 1216 perp_mode = 0; 1217 1218 if (FDCS->perp_mode == perp_mode) 1219 return; 1220 if (FDCS->version >= FDC_82077_ORIG) { 1221 output_byte(FD_PERPENDICULAR); 1222 output_byte(perp_mode); 1223 FDCS->perp_mode = perp_mode; 1224 } else if (perp_mode) { 1225 DPRINT("perpendicular mode not supported by this FDC.\n"); 1226 } 1227 } /* perpendicular_mode */ 1228 1229 static int fifo_depth = 0xa; 1230 static int no_fifo; 1231 1232 static int fdc_configure(void) 1233 { 1234 /* Turn on FIFO */ 1235 output_byte(FD_CONFIGURE); 1236 if (need_more_output() != MORE_OUTPUT) 1237 return 0; 1238 output_byte(0); 1239 output_byte(0x10 | (no_fifo & 0x20) | (fifo_depth & 0xf)); 1240 output_byte(0); /* pre-compensation from track 1241 0 upwards */ 1242 return 1; 1243 } 1244 1245 #define NOMINAL_DTR 500 1246 1247 /* Issue a "SPECIFY" command to set the step rate time, head unload time, 1248 * head load time, and DMA disable flag to values needed by floppy. 1249 * 1250 * The value "dtr" is the data transfer rate in Kbps. It is needed 1251 * to account for the data rate-based scaling done by the 82072 and 82077 1252 * FDC types. This parameter is ignored for other types of FDCs (i.e. 1253 * 8272a). 1254 * 1255 * Note that changing the data transfer rate has a (probably deleterious) 1256 * effect on the parameters subject to scaling for 82072/82077 FDCs, so 1257 * fdc_specify is called again after each data transfer rate 1258 * change. 1259 * 1260 * srt: 1000 to 16000 in microseconds 1261 * hut: 16 to 240 milliseconds 1262 * hlt: 2 to 254 milliseconds 1263 * 1264 * These values are rounded up to the next highest available delay time. 1265 */ 1266 static void fdc_specify(void) 1267 { 1268 unsigned char spec1; 1269 unsigned char spec2; 1270 unsigned long srt; 1271 unsigned long hlt; 1272 unsigned long hut; 1273 unsigned long dtr = NOMINAL_DTR; 1274 unsigned long scale_dtr = NOMINAL_DTR; 1275 int hlt_max_code = 0x7f; 1276 int hut_max_code = 0xf; 1277 1278 if (FDCS->need_configure && FDCS->version >= FDC_82072A) { 1279 fdc_configure(); 1280 FDCS->need_configure = 0; 1281 } 1282 1283 switch (raw_cmd->rate & 0x03) { 1284 case 3: 1285 dtr = 1000; 1286 break; 1287 case 1: 1288 dtr = 300; 1289 if (FDCS->version >= FDC_82078) { 1290 /* chose the default rate table, not the one 1291 * where 1 = 2 Mbps */ 1292 output_byte(FD_DRIVESPEC); 1293 if (need_more_output() == MORE_OUTPUT) { 1294 output_byte(UNIT(current_drive)); 1295 output_byte(0xc0); 1296 } 1297 } 1298 break; 1299 case 2: 1300 dtr = 250; 1301 break; 1302 } 1303 1304 if (FDCS->version >= FDC_82072) { 1305 scale_dtr = dtr; 1306 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */ 1307 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */ 1308 } 1309 1310 /* Convert step rate from microseconds to milliseconds and 4 bits */ 1311 srt = 16 - DIV_ROUND_UP(DP->srt * scale_dtr / 1000, NOMINAL_DTR); 1312 if (slow_floppy) 1313 srt = srt / 4; 1314 1315 SUPBOUND(srt, 0xf); 1316 INFBOUND(srt, 0); 1317 1318 hlt = DIV_ROUND_UP(DP->hlt * scale_dtr / 2, NOMINAL_DTR); 1319 if (hlt < 0x01) 1320 hlt = 0x01; 1321 else if (hlt > 0x7f) 1322 hlt = hlt_max_code; 1323 1324 hut = DIV_ROUND_UP(DP->hut * scale_dtr / 16, NOMINAL_DTR); 1325 if (hut < 0x1) 1326 hut = 0x1; 1327 else if (hut > 0xf) 1328 hut = hut_max_code; 1329 1330 spec1 = (srt << 4) | hut; 1331 spec2 = (hlt << 1) | (use_virtual_dma & 1); 1332 1333 /* If these parameters did not change, just return with success */ 1334 if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) { 1335 /* Go ahead and set spec1 and spec2 */ 1336 output_byte(FD_SPECIFY); 1337 output_byte(FDCS->spec1 = spec1); 1338 output_byte(FDCS->spec2 = spec2); 1339 } 1340 } /* fdc_specify */ 1341 1342 /* Set the FDC's data transfer rate on behalf of the specified drive. 1343 * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue 1344 * of the specify command (i.e. using the fdc_specify function). 1345 */ 1346 static int fdc_dtr(void) 1347 { 1348 /* If data rate not already set to desired value, set it. */ 1349 if ((raw_cmd->rate & 3) == FDCS->dtr) 1350 return 0; 1351 1352 /* Set dtr */ 1353 fd_outb(raw_cmd->rate & 3, FD_DCR); 1354 1355 /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB) 1356 * need a stabilization period of several milliseconds to be 1357 * enforced after data rate changes before R/W operations. 1358 * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies) 1359 */ 1360 FDCS->dtr = raw_cmd->rate & 3; 1361 return fd_wait_for_completion(jiffies + 2UL * HZ / 100, floppy_ready); 1362 } /* fdc_dtr */ 1363 1364 static void tell_sector(void) 1365 { 1366 pr_cont(": track %d, head %d, sector %d, size %d", 1367 R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE); 1368 } /* tell_sector */ 1369 1370 static void print_errors(void) 1371 { 1372 DPRINT(""); 1373 if (ST0 & ST0_ECE) { 1374 pr_cont("Recalibrate failed!"); 1375 } else if (ST2 & ST2_CRC) { 1376 pr_cont("data CRC error"); 1377 tell_sector(); 1378 } else if (ST1 & ST1_CRC) { 1379 pr_cont("CRC error"); 1380 tell_sector(); 1381 } else if ((ST1 & (ST1_MAM | ST1_ND)) || 1382 (ST2 & ST2_MAM)) { 1383 if (!probing) { 1384 pr_cont("sector not found"); 1385 tell_sector(); 1386 } else 1387 pr_cont("probe failed..."); 1388 } else if (ST2 & ST2_WC) { /* seek error */ 1389 pr_cont("wrong cylinder"); 1390 } else if (ST2 & ST2_BC) { /* cylinder marked as bad */ 1391 pr_cont("bad cylinder"); 1392 } else { 1393 pr_cont("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x", 1394 ST0, ST1, ST2); 1395 tell_sector(); 1396 } 1397 pr_cont("\n"); 1398 } 1399 1400 /* 1401 * OK, this error interpreting routine is called after a 1402 * DMA read/write has succeeded 1403 * or failed, so we check the results, and copy any buffers. 1404 * hhb: Added better error reporting. 1405 * ak: Made this into a separate routine. 1406 */ 1407 static int interpret_errors(void) 1408 { 1409 char bad; 1410 1411 if (inr != 7) { 1412 DPRINT("-- FDC reply error\n"); 1413 FDCS->reset = 1; 1414 return 1; 1415 } 1416 1417 /* check IC to find cause of interrupt */ 1418 switch (ST0 & ST0_INTR) { 1419 case 0x40: /* error occurred during command execution */ 1420 if (ST1 & ST1_EOC) 1421 return 0; /* occurs with pseudo-DMA */ 1422 bad = 1; 1423 if (ST1 & ST1_WP) { 1424 DPRINT("Drive is write protected\n"); 1425 clear_bit(FD_DISK_WRITABLE_BIT, &DRS->flags); 1426 cont->done(0); 1427 bad = 2; 1428 } else if (ST1 & ST1_ND) { 1429 set_bit(FD_NEED_TWADDLE_BIT, &DRS->flags); 1430 } else if (ST1 & ST1_OR) { 1431 if (DP->flags & FTD_MSG) 1432 DPRINT("Over/Underrun - retrying\n"); 1433 bad = 0; 1434 } else if (*errors >= DP->max_errors.reporting) { 1435 print_errors(); 1436 } 1437 if (ST2 & ST2_WC || ST2 & ST2_BC) 1438 /* wrong cylinder => recal */ 1439 DRS->track = NEED_2_RECAL; 1440 return bad; 1441 case 0x80: /* invalid command given */ 1442 DPRINT("Invalid FDC command given!\n"); 1443 cont->done(0); 1444 return 2; 1445 case 0xc0: 1446 DPRINT("Abnormal termination caused by polling\n"); 1447 cont->error(); 1448 return 2; 1449 default: /* (0) Normal command termination */ 1450 return 0; 1451 } 1452 } 1453 1454 /* 1455 * This routine is called when everything should be correctly set up 1456 * for the transfer (i.e. floppy motor is on, the correct floppy is 1457 * selected, and the head is sitting on the right track). 1458 */ 1459 static void setup_rw_floppy(void) 1460 { 1461 int i; 1462 int r; 1463 int flags; 1464 unsigned long ready_date; 1465 void (*function)(void); 1466 1467 flags = raw_cmd->flags; 1468 if (flags & (FD_RAW_READ | FD_RAW_WRITE)) 1469 flags |= FD_RAW_INTR; 1470 1471 if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)) { 1472 ready_date = DRS->spinup_date + DP->spinup; 1473 /* If spinup will take a long time, rerun scandrives 1474 * again just before spinup completion. Beware that 1475 * after scandrives, we must again wait for selection. 1476 */ 1477 if (time_after(ready_date, jiffies + DP->select_delay)) { 1478 ready_date -= DP->select_delay; 1479 function = floppy_start; 1480 } else 1481 function = setup_rw_floppy; 1482 1483 /* wait until the floppy is spinning fast enough */ 1484 if (fd_wait_for_completion(ready_date, function)) 1485 return; 1486 } 1487 if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE)) 1488 setup_DMA(); 1489 1490 if (flags & FD_RAW_INTR) 1491 do_floppy = main_command_interrupt; 1492 1493 r = 0; 1494 for (i = 0; i < raw_cmd->cmd_count; i++) 1495 r |= output_byte(raw_cmd->cmd[i]); 1496 1497 debugt(__func__, "rw_command"); 1498 1499 if (r) { 1500 cont->error(); 1501 reset_fdc(); 1502 return; 1503 } 1504 1505 if (!(flags & FD_RAW_INTR)) { 1506 inr = result(); 1507 cont->interrupt(); 1508 } else if (flags & FD_RAW_NEED_DISK) 1509 fd_watchdog(); 1510 } 1511 1512 static int blind_seek; 1513 1514 /* 1515 * This is the routine called after every seek (or recalibrate) interrupt 1516 * from the floppy controller. 1517 */ 1518 static void seek_interrupt(void) 1519 { 1520 debugt(__func__, ""); 1521 if (inr != 2 || (ST0 & 0xF8) != 0x20) { 1522 DPRINT("seek failed\n"); 1523 DRS->track = NEED_2_RECAL; 1524 cont->error(); 1525 cont->redo(); 1526 return; 1527 } 1528 if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek) { 1529 debug_dcl(DP->flags, 1530 "clearing NEWCHANGE flag because of effective seek\n"); 1531 debug_dcl(DP->flags, "jiffies=%lu\n", jiffies); 1532 clear_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags); 1533 /* effective seek */ 1534 DRS->select_date = jiffies; 1535 } 1536 DRS->track = ST1; 1537 floppy_ready(); 1538 } 1539 1540 static void check_wp(void) 1541 { 1542 if (test_bit(FD_VERIFY_BIT, &DRS->flags)) { 1543 /* check write protection */ 1544 output_byte(FD_GETSTATUS); 1545 output_byte(UNIT(current_drive)); 1546 if (result() != 1) { 1547 FDCS->reset = 1; 1548 return; 1549 } 1550 clear_bit(FD_VERIFY_BIT, &DRS->flags); 1551 clear_bit(FD_NEED_TWADDLE_BIT, &DRS->flags); 1552 debug_dcl(DP->flags, 1553 "checking whether disk is write protected\n"); 1554 debug_dcl(DP->flags, "wp=%x\n", ST3 & 0x40); 1555 if (!(ST3 & 0x40)) 1556 set_bit(FD_DISK_WRITABLE_BIT, &DRS->flags); 1557 else 1558 clear_bit(FD_DISK_WRITABLE_BIT, &DRS->flags); 1559 } 1560 } 1561 1562 static void seek_floppy(void) 1563 { 1564 int track; 1565 1566 blind_seek = 0; 1567 1568 debug_dcl(DP->flags, "calling disk change from %s\n", __func__); 1569 1570 if (!test_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags) && 1571 disk_change(current_drive) && (raw_cmd->flags & FD_RAW_NEED_DISK)) { 1572 /* the media changed flag should be cleared after the seek. 1573 * If it isn't, this means that there is really no disk in 1574 * the drive. 1575 */ 1576 set_bit(FD_DISK_CHANGED_BIT, &DRS->flags); 1577 cont->done(0); 1578 cont->redo(); 1579 return; 1580 } 1581 if (DRS->track <= NEED_1_RECAL) { 1582 recalibrate_floppy(); 1583 return; 1584 } else if (test_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags) && 1585 (raw_cmd->flags & FD_RAW_NEED_DISK) && 1586 (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) { 1587 /* we seek to clear the media-changed condition. Does anybody 1588 * know a more elegant way, which works on all drives? */ 1589 if (raw_cmd->track) 1590 track = raw_cmd->track - 1; 1591 else { 1592 if (DP->flags & FD_SILENT_DCL_CLEAR) { 1593 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0); 1594 blind_seek = 1; 1595 raw_cmd->flags |= FD_RAW_NEED_SEEK; 1596 } 1597 track = 1; 1598 } 1599 } else { 1600 check_wp(); 1601 if (raw_cmd->track != DRS->track && 1602 (raw_cmd->flags & FD_RAW_NEED_SEEK)) 1603 track = raw_cmd->track; 1604 else { 1605 setup_rw_floppy(); 1606 return; 1607 } 1608 } 1609 1610 do_floppy = seek_interrupt; 1611 output_byte(FD_SEEK); 1612 output_byte(UNIT(current_drive)); 1613 if (output_byte(track) < 0) { 1614 reset_fdc(); 1615 return; 1616 } 1617 debugt(__func__, ""); 1618 } 1619 1620 static void recal_interrupt(void) 1621 { 1622 debugt(__func__, ""); 1623 if (inr != 2) 1624 FDCS->reset = 1; 1625 else if (ST0 & ST0_ECE) { 1626 switch (DRS->track) { 1627 case NEED_1_RECAL: 1628 debugt(__func__, "need 1 recal"); 1629 /* after a second recalibrate, we still haven't 1630 * reached track 0. Probably no drive. Raise an 1631 * error, as failing immediately might upset 1632 * computers possessed by the Devil :-) */ 1633 cont->error(); 1634 cont->redo(); 1635 return; 1636 case NEED_2_RECAL: 1637 debugt(__func__, "need 2 recal"); 1638 /* If we already did a recalibrate, 1639 * and we are not at track 0, this 1640 * means we have moved. (The only way 1641 * not to move at recalibration is to 1642 * be already at track 0.) Clear the 1643 * new change flag */ 1644 debug_dcl(DP->flags, 1645 "clearing NEWCHANGE flag because of second recalibrate\n"); 1646 1647 clear_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags); 1648 DRS->select_date = jiffies; 1649 /* fall through */ 1650 default: 1651 debugt(__func__, "default"); 1652 /* Recalibrate moves the head by at 1653 * most 80 steps. If after one 1654 * recalibrate we don't have reached 1655 * track 0, this might mean that we 1656 * started beyond track 80. Try 1657 * again. */ 1658 DRS->track = NEED_1_RECAL; 1659 break; 1660 } 1661 } else 1662 DRS->track = ST1; 1663 floppy_ready(); 1664 } 1665 1666 static void print_result(char *message, int inr) 1667 { 1668 int i; 1669 1670 DPRINT("%s ", message); 1671 if (inr >= 0) 1672 for (i = 0; i < inr; i++) 1673 pr_cont("repl[%d]=%x ", i, reply_buffer[i]); 1674 pr_cont("\n"); 1675 } 1676 1677 /* interrupt handler. Note that this can be called externally on the Sparc */ 1678 irqreturn_t floppy_interrupt(int irq, void *dev_id) 1679 { 1680 int do_print; 1681 unsigned long f; 1682 void (*handler)(void) = do_floppy; 1683 1684 lasthandler = handler; 1685 interruptjiffies = jiffies; 1686 1687 f = claim_dma_lock(); 1688 fd_disable_dma(); 1689 release_dma_lock(f); 1690 1691 do_floppy = NULL; 1692 if (fdc >= N_FDC || FDCS->address == -1) { 1693 /* we don't even know which FDC is the culprit */ 1694 pr_info("DOR0=%x\n", fdc_state[0].dor); 1695 pr_info("floppy interrupt on bizarre fdc %d\n", fdc); 1696 pr_info("handler=%pf\n", handler); 1697 is_alive(__func__, "bizarre fdc"); 1698 return IRQ_NONE; 1699 } 1700 1701 FDCS->reset = 0; 1702 /* We have to clear the reset flag here, because apparently on boxes 1703 * with level triggered interrupts (PS/2, Sparc, ...), it is needed to 1704 * emit SENSEI's to clear the interrupt line. And FDCS->reset blocks the 1705 * emission of the SENSEI's. 1706 * It is OK to emit floppy commands because we are in an interrupt 1707 * handler here, and thus we have to fear no interference of other 1708 * activity. 1709 */ 1710 1711 do_print = !handler && print_unex && initialized; 1712 1713 inr = result(); 1714 if (do_print) 1715 print_result("unexpected interrupt", inr); 1716 if (inr == 0) { 1717 int max_sensei = 4; 1718 do { 1719 output_byte(FD_SENSEI); 1720 inr = result(); 1721 if (do_print) 1722 print_result("sensei", inr); 1723 max_sensei--; 1724 } while ((ST0 & 0x83) != UNIT(current_drive) && 1725 inr == 2 && max_sensei); 1726 } 1727 if (!handler) { 1728 FDCS->reset = 1; 1729 return IRQ_NONE; 1730 } 1731 schedule_bh(handler); 1732 is_alive(__func__, "normal interrupt end"); 1733 1734 /* FIXME! Was it really for us? */ 1735 return IRQ_HANDLED; 1736 } 1737 1738 static void recalibrate_floppy(void) 1739 { 1740 debugt(__func__, ""); 1741 do_floppy = recal_interrupt; 1742 output_byte(FD_RECALIBRATE); 1743 if (output_byte(UNIT(current_drive)) < 0) 1744 reset_fdc(); 1745 } 1746 1747 /* 1748 * Must do 4 FD_SENSEIs after reset because of ``drive polling''. 1749 */ 1750 static void reset_interrupt(void) 1751 { 1752 debugt(__func__, ""); 1753 result(); /* get the status ready for set_fdc */ 1754 if (FDCS->reset) { 1755 pr_info("reset set in interrupt, calling %pf\n", cont->error); 1756 cont->error(); /* a reset just after a reset. BAD! */ 1757 } 1758 cont->redo(); 1759 } 1760 1761 /* 1762 * reset is done by pulling bit 2 of DOR low for a while (old FDCs), 1763 * or by setting the self clearing bit 7 of STATUS (newer FDCs) 1764 */ 1765 static void reset_fdc(void) 1766 { 1767 unsigned long flags; 1768 1769 do_floppy = reset_interrupt; 1770 FDCS->reset = 0; 1771 reset_fdc_info(0); 1772 1773 /* Pseudo-DMA may intercept 'reset finished' interrupt. */ 1774 /* Irrelevant for systems with true DMA (i386). */ 1775 1776 flags = claim_dma_lock(); 1777 fd_disable_dma(); 1778 release_dma_lock(flags); 1779 1780 if (FDCS->version >= FDC_82072A) 1781 fd_outb(0x80 | (FDCS->dtr & 3), FD_STATUS); 1782 else { 1783 fd_outb(FDCS->dor & ~0x04, FD_DOR); 1784 udelay(FD_RESET_DELAY); 1785 fd_outb(FDCS->dor, FD_DOR); 1786 } 1787 } 1788 1789 static void show_floppy(void) 1790 { 1791 int i; 1792 1793 pr_info("\n"); 1794 pr_info("floppy driver state\n"); 1795 pr_info("-------------------\n"); 1796 pr_info("now=%lu last interrupt=%lu diff=%lu last called handler=%pf\n", 1797 jiffies, interruptjiffies, jiffies - interruptjiffies, 1798 lasthandler); 1799 1800 pr_info("timeout_message=%s\n", timeout_message); 1801 pr_info("last output bytes:\n"); 1802 for (i = 0; i < OLOGSIZE; i++) 1803 pr_info("%2x %2x %lu\n", 1804 output_log[(i + output_log_pos) % OLOGSIZE].data, 1805 output_log[(i + output_log_pos) % OLOGSIZE].status, 1806 output_log[(i + output_log_pos) % OLOGSIZE].jiffies); 1807 pr_info("last result at %lu\n", resultjiffies); 1808 pr_info("last redo_fd_request at %lu\n", lastredo); 1809 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1, 1810 reply_buffer, resultsize, true); 1811 1812 pr_info("status=%x\n", fd_inb(FD_STATUS)); 1813 pr_info("fdc_busy=%lu\n", fdc_busy); 1814 if (do_floppy) 1815 pr_info("do_floppy=%pf\n", do_floppy); 1816 if (work_pending(&floppy_work)) 1817 pr_info("floppy_work.func=%pf\n", floppy_work.func); 1818 if (delayed_work_pending(&fd_timer)) 1819 pr_info("delayed work.function=%p expires=%ld\n", 1820 fd_timer.work.func, 1821 fd_timer.timer.expires - jiffies); 1822 if (delayed_work_pending(&fd_timeout)) 1823 pr_info("timer_function=%p expires=%ld\n", 1824 fd_timeout.work.func, 1825 fd_timeout.timer.expires - jiffies); 1826 1827 pr_info("cont=%p\n", cont); 1828 pr_info("current_req=%p\n", current_req); 1829 pr_info("command_status=%d\n", command_status); 1830 pr_info("\n"); 1831 } 1832 1833 static void floppy_shutdown(struct work_struct *arg) 1834 { 1835 unsigned long flags; 1836 1837 if (initialized) 1838 show_floppy(); 1839 cancel_activity(); 1840 1841 flags = claim_dma_lock(); 1842 fd_disable_dma(); 1843 release_dma_lock(flags); 1844 1845 /* avoid dma going to a random drive after shutdown */ 1846 1847 if (initialized) 1848 DPRINT("floppy timeout called\n"); 1849 FDCS->reset = 1; 1850 if (cont) { 1851 cont->done(0); 1852 cont->redo(); /* this will recall reset when needed */ 1853 } else { 1854 pr_info("no cont in shutdown!\n"); 1855 process_fd_request(); 1856 } 1857 is_alive(__func__, ""); 1858 } 1859 1860 /* start motor, check media-changed condition and write protection */ 1861 static int start_motor(void (*function)(void)) 1862 { 1863 int mask; 1864 int data; 1865 1866 mask = 0xfc; 1867 data = UNIT(current_drive); 1868 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)) { 1869 if (!(FDCS->dor & (0x10 << UNIT(current_drive)))) { 1870 set_debugt(); 1871 /* no read since this drive is running */ 1872 DRS->first_read_date = 0; 1873 /* note motor start time if motor is not yet running */ 1874 DRS->spinup_date = jiffies; 1875 data |= (0x10 << UNIT(current_drive)); 1876 } 1877 } else if (FDCS->dor & (0x10 << UNIT(current_drive))) 1878 mask &= ~(0x10 << UNIT(current_drive)); 1879 1880 /* starts motor and selects floppy */ 1881 del_timer(motor_off_timer + current_drive); 1882 set_dor(fdc, mask, data); 1883 1884 /* wait_for_completion also schedules reset if needed. */ 1885 return fd_wait_for_completion(DRS->select_date + DP->select_delay, 1886 function); 1887 } 1888 1889 static void floppy_ready(void) 1890 { 1891 if (FDCS->reset) { 1892 reset_fdc(); 1893 return; 1894 } 1895 if (start_motor(floppy_ready)) 1896 return; 1897 if (fdc_dtr()) 1898 return; 1899 1900 debug_dcl(DP->flags, "calling disk change from floppy_ready\n"); 1901 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) && 1902 disk_change(current_drive) && !DP->select_delay) 1903 twaddle(); /* this clears the dcl on certain 1904 * drive/controller combinations */ 1905 1906 #ifdef fd_chose_dma_mode 1907 if ((raw_cmd->flags & FD_RAW_READ) || (raw_cmd->flags & FD_RAW_WRITE)) { 1908 unsigned long flags = claim_dma_lock(); 1909 fd_chose_dma_mode(raw_cmd->kernel_data, raw_cmd->length); 1910 release_dma_lock(flags); 1911 } 1912 #endif 1913 1914 if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)) { 1915 perpendicular_mode(); 1916 fdc_specify(); /* must be done here because of hut, hlt ... */ 1917 seek_floppy(); 1918 } else { 1919 if ((raw_cmd->flags & FD_RAW_READ) || 1920 (raw_cmd->flags & FD_RAW_WRITE)) 1921 fdc_specify(); 1922 setup_rw_floppy(); 1923 } 1924 } 1925 1926 static void floppy_start(void) 1927 { 1928 reschedule_timeout(current_reqD, "floppy start"); 1929 1930 scandrives(); 1931 debug_dcl(DP->flags, "setting NEWCHANGE in floppy_start\n"); 1932 set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags); 1933 floppy_ready(); 1934 } 1935 1936 /* 1937 * ======================================================================== 1938 * here ends the bottom half. Exported routines are: 1939 * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc, 1940 * start_motor, reset_fdc, reset_fdc_info, interpret_errors. 1941 * Initialization also uses output_byte, result, set_dor, floppy_interrupt 1942 * and set_dor. 1943 * ======================================================================== 1944 */ 1945 /* 1946 * General purpose continuations. 1947 * ============================== 1948 */ 1949 1950 static void do_wakeup(void) 1951 { 1952 reschedule_timeout(MAXTIMEOUT, "do wakeup"); 1953 cont = NULL; 1954 command_status += 2; 1955 wake_up(&command_done); 1956 } 1957 1958 static const struct cont_t wakeup_cont = { 1959 .interrupt = empty, 1960 .redo = do_wakeup, 1961 .error = empty, 1962 .done = (done_f)empty 1963 }; 1964 1965 static const struct cont_t intr_cont = { 1966 .interrupt = empty, 1967 .redo = process_fd_request, 1968 .error = empty, 1969 .done = (done_f)empty 1970 }; 1971 1972 static int wait_til_done(void (*handler)(void), bool interruptible) 1973 { 1974 int ret; 1975 1976 schedule_bh(handler); 1977 1978 if (interruptible) 1979 wait_event_interruptible(command_done, command_status >= 2); 1980 else 1981 wait_event(command_done, command_status >= 2); 1982 1983 if (command_status < 2) { 1984 cancel_activity(); 1985 cont = &intr_cont; 1986 reset_fdc(); 1987 return -EINTR; 1988 } 1989 1990 if (FDCS->reset) 1991 command_status = FD_COMMAND_ERROR; 1992 if (command_status == FD_COMMAND_OKAY) 1993 ret = 0; 1994 else 1995 ret = -EIO; 1996 command_status = FD_COMMAND_NONE; 1997 return ret; 1998 } 1999 2000 static void generic_done(int result) 2001 { 2002 command_status = result; 2003 cont = &wakeup_cont; 2004 } 2005 2006 static void generic_success(void) 2007 { 2008 cont->done(1); 2009 } 2010 2011 static void generic_failure(void) 2012 { 2013 cont->done(0); 2014 } 2015 2016 static void success_and_wakeup(void) 2017 { 2018 generic_success(); 2019 cont->redo(); 2020 } 2021 2022 /* 2023 * formatting and rw support. 2024 * ========================== 2025 */ 2026 2027 static int next_valid_format(void) 2028 { 2029 int probed_format; 2030 2031 probed_format = DRS->probed_format; 2032 while (1) { 2033 if (probed_format >= 8 || !DP->autodetect[probed_format]) { 2034 DRS->probed_format = 0; 2035 return 1; 2036 } 2037 if (floppy_type[DP->autodetect[probed_format]].sect) { 2038 DRS->probed_format = probed_format; 2039 return 0; 2040 } 2041 probed_format++; 2042 } 2043 } 2044 2045 static void bad_flp_intr(void) 2046 { 2047 int err_count; 2048 2049 if (probing) { 2050 DRS->probed_format++; 2051 if (!next_valid_format()) 2052 return; 2053 } 2054 err_count = ++(*errors); 2055 INFBOUND(DRWE->badness, err_count); 2056 if (err_count > DP->max_errors.abort) 2057 cont->done(0); 2058 if (err_count > DP->max_errors.reset) 2059 FDCS->reset = 1; 2060 else if (err_count > DP->max_errors.recal) 2061 DRS->track = NEED_2_RECAL; 2062 } 2063 2064 static void set_floppy(int drive) 2065 { 2066 int type = ITYPE(UDRS->fd_device); 2067 2068 if (type) 2069 _floppy = floppy_type + type; 2070 else 2071 _floppy = current_type[drive]; 2072 } 2073 2074 /* 2075 * formatting support. 2076 * =================== 2077 */ 2078 static void format_interrupt(void) 2079 { 2080 switch (interpret_errors()) { 2081 case 1: 2082 cont->error(); 2083 case 2: 2084 break; 2085 case 0: 2086 cont->done(1); 2087 } 2088 cont->redo(); 2089 } 2090 2091 #define FM_MODE(x, y) ((y) & ~(((x)->rate & 0x80) >> 1)) 2092 #define CT(x) ((x) | 0xc0) 2093 2094 static void setup_format_params(int track) 2095 { 2096 int n; 2097 int il; 2098 int count; 2099 int head_shift; 2100 int track_shift; 2101 struct fparm { 2102 unsigned char track, head, sect, size; 2103 } *here = (struct fparm *)floppy_track_buffer; 2104 2105 raw_cmd = &default_raw_cmd; 2106 raw_cmd->track = track; 2107 2108 raw_cmd->flags = (FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN | 2109 FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK); 2110 raw_cmd->rate = _floppy->rate & 0x43; 2111 raw_cmd->cmd_count = NR_F; 2112 COMMAND = FM_MODE(_floppy, FD_FORMAT); 2113 DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, format_req.head); 2114 F_SIZECODE = FD_SIZECODE(_floppy); 2115 F_SECT_PER_TRACK = _floppy->sect << 2 >> F_SIZECODE; 2116 F_GAP = _floppy->fmt_gap; 2117 F_FILL = FD_FILL_BYTE; 2118 2119 raw_cmd->kernel_data = floppy_track_buffer; 2120 raw_cmd->length = 4 * F_SECT_PER_TRACK; 2121 2122 /* allow for about 30ms for data transport per track */ 2123 head_shift = (F_SECT_PER_TRACK + 5) / 6; 2124 2125 /* a ``cylinder'' is two tracks plus a little stepping time */ 2126 track_shift = 2 * head_shift + 3; 2127 2128 /* position of logical sector 1 on this track */ 2129 n = (track_shift * format_req.track + head_shift * format_req.head) 2130 % F_SECT_PER_TRACK; 2131 2132 /* determine interleave */ 2133 il = 1; 2134 if (_floppy->fmt_gap < 0x22) 2135 il++; 2136 2137 /* initialize field */ 2138 for (count = 0; count < F_SECT_PER_TRACK; ++count) { 2139 here[count].track = format_req.track; 2140 here[count].head = format_req.head; 2141 here[count].sect = 0; 2142 here[count].size = F_SIZECODE; 2143 } 2144 /* place logical sectors */ 2145 for (count = 1; count <= F_SECT_PER_TRACK; ++count) { 2146 here[n].sect = count; 2147 n = (n + il) % F_SECT_PER_TRACK; 2148 if (here[n].sect) { /* sector busy, find next free sector */ 2149 ++n; 2150 if (n >= F_SECT_PER_TRACK) { 2151 n -= F_SECT_PER_TRACK; 2152 while (here[n].sect) 2153 ++n; 2154 } 2155 } 2156 } 2157 if (_floppy->stretch & FD_SECTBASEMASK) { 2158 for (count = 0; count < F_SECT_PER_TRACK; count++) 2159 here[count].sect += FD_SECTBASE(_floppy) - 1; 2160 } 2161 } 2162 2163 static void redo_format(void) 2164 { 2165 buffer_track = -1; 2166 setup_format_params(format_req.track << STRETCH(_floppy)); 2167 floppy_start(); 2168 debugt(__func__, "queue format request"); 2169 } 2170 2171 static const struct cont_t format_cont = { 2172 .interrupt = format_interrupt, 2173 .redo = redo_format, 2174 .error = bad_flp_intr, 2175 .done = generic_done 2176 }; 2177 2178 static int do_format(int drive, struct format_descr *tmp_format_req) 2179 { 2180 int ret; 2181 2182 if (lock_fdc(drive)) 2183 return -EINTR; 2184 2185 set_floppy(drive); 2186 if (!_floppy || 2187 _floppy->track > DP->tracks || 2188 tmp_format_req->track >= _floppy->track || 2189 tmp_format_req->head >= _floppy->head || 2190 (_floppy->sect << 2) % (1 << FD_SIZECODE(_floppy)) || 2191 !_floppy->fmt_gap) { 2192 process_fd_request(); 2193 return -EINVAL; 2194 } 2195 format_req = *tmp_format_req; 2196 format_errors = 0; 2197 cont = &format_cont; 2198 errors = &format_errors; 2199 ret = wait_til_done(redo_format, true); 2200 if (ret == -EINTR) 2201 return -EINTR; 2202 process_fd_request(); 2203 return ret; 2204 } 2205 2206 /* 2207 * Buffer read/write and support 2208 * ============================= 2209 */ 2210 2211 static void floppy_end_request(struct request *req, blk_status_t error) 2212 { 2213 unsigned int nr_sectors = current_count_sectors; 2214 unsigned int drive = (unsigned long)req->rq_disk->private_data; 2215 2216 /* current_count_sectors can be zero if transfer failed */ 2217 if (error) 2218 nr_sectors = blk_rq_cur_sectors(req); 2219 if (__blk_end_request(req, error, nr_sectors << 9)) 2220 return; 2221 2222 /* We're done with the request */ 2223 floppy_off(drive); 2224 current_req = NULL; 2225 } 2226 2227 /* new request_done. Can handle physical sectors which are smaller than a 2228 * logical buffer */ 2229 static void request_done(int uptodate) 2230 { 2231 struct request *req = current_req; 2232 struct request_queue *q; 2233 unsigned long flags; 2234 int block; 2235 char msg[sizeof("request done ") + sizeof(int) * 3]; 2236 2237 probing = 0; 2238 snprintf(msg, sizeof(msg), "request done %d", uptodate); 2239 reschedule_timeout(MAXTIMEOUT, msg); 2240 2241 if (!req) { 2242 pr_info("floppy.c: no request in request_done\n"); 2243 return; 2244 } 2245 2246 q = req->q; 2247 2248 if (uptodate) { 2249 /* maintain values for invalidation on geometry 2250 * change */ 2251 block = current_count_sectors + blk_rq_pos(req); 2252 INFBOUND(DRS->maxblock, block); 2253 if (block > _floppy->sect) 2254 DRS->maxtrack = 1; 2255 2256 /* unlock chained buffers */ 2257 spin_lock_irqsave(q->queue_lock, flags); 2258 floppy_end_request(req, 0); 2259 spin_unlock_irqrestore(q->queue_lock, flags); 2260 } else { 2261 if (rq_data_dir(req) == WRITE) { 2262 /* record write error information */ 2263 DRWE->write_errors++; 2264 if (DRWE->write_errors == 1) { 2265 DRWE->first_error_sector = blk_rq_pos(req); 2266 DRWE->first_error_generation = DRS->generation; 2267 } 2268 DRWE->last_error_sector = blk_rq_pos(req); 2269 DRWE->last_error_generation = DRS->generation; 2270 } 2271 spin_lock_irqsave(q->queue_lock, flags); 2272 floppy_end_request(req, BLK_STS_IOERR); 2273 spin_unlock_irqrestore(q->queue_lock, flags); 2274 } 2275 } 2276 2277 /* Interrupt handler evaluating the result of the r/w operation */ 2278 static void rw_interrupt(void) 2279 { 2280 int eoc; 2281 int ssize; 2282 int heads; 2283 int nr_sectors; 2284 2285 if (R_HEAD >= 2) { 2286 /* some Toshiba floppy controllers occasionnally seem to 2287 * return bogus interrupts after read/write operations, which 2288 * can be recognized by a bad head number (>= 2) */ 2289 return; 2290 } 2291 2292 if (!DRS->first_read_date) 2293 DRS->first_read_date = jiffies; 2294 2295 nr_sectors = 0; 2296 ssize = DIV_ROUND_UP(1 << SIZECODE, 4); 2297 2298 if (ST1 & ST1_EOC) 2299 eoc = 1; 2300 else 2301 eoc = 0; 2302 2303 if (COMMAND & 0x80) 2304 heads = 2; 2305 else 2306 heads = 1; 2307 2308 nr_sectors = (((R_TRACK - TRACK) * heads + 2309 R_HEAD - HEAD) * SECT_PER_TRACK + 2310 R_SECTOR - SECTOR + eoc) << SIZECODE >> 2; 2311 2312 if (nr_sectors / ssize > 2313 DIV_ROUND_UP(in_sector_offset + current_count_sectors, ssize)) { 2314 DPRINT("long rw: %x instead of %lx\n", 2315 nr_sectors, current_count_sectors); 2316 pr_info("rs=%d s=%d\n", R_SECTOR, SECTOR); 2317 pr_info("rh=%d h=%d\n", R_HEAD, HEAD); 2318 pr_info("rt=%d t=%d\n", R_TRACK, TRACK); 2319 pr_info("heads=%d eoc=%d\n", heads, eoc); 2320 pr_info("spt=%d st=%d ss=%d\n", 2321 SECT_PER_TRACK, fsector_t, ssize); 2322 pr_info("in_sector_offset=%d\n", in_sector_offset); 2323 } 2324 2325 nr_sectors -= in_sector_offset; 2326 INFBOUND(nr_sectors, 0); 2327 SUPBOUND(current_count_sectors, nr_sectors); 2328 2329 switch (interpret_errors()) { 2330 case 2: 2331 cont->redo(); 2332 return; 2333 case 1: 2334 if (!current_count_sectors) { 2335 cont->error(); 2336 cont->redo(); 2337 return; 2338 } 2339 break; 2340 case 0: 2341 if (!current_count_sectors) { 2342 cont->redo(); 2343 return; 2344 } 2345 current_type[current_drive] = _floppy; 2346 floppy_sizes[TOMINOR(current_drive)] = _floppy->size; 2347 break; 2348 } 2349 2350 if (probing) { 2351 if (DP->flags & FTD_MSG) 2352 DPRINT("Auto-detected floppy type %s in fd%d\n", 2353 _floppy->name, current_drive); 2354 current_type[current_drive] = _floppy; 2355 floppy_sizes[TOMINOR(current_drive)] = _floppy->size; 2356 probing = 0; 2357 } 2358 2359 if (CT(COMMAND) != FD_READ || 2360 raw_cmd->kernel_data == bio_data(current_req->bio)) { 2361 /* transfer directly from buffer */ 2362 cont->done(1); 2363 } else if (CT(COMMAND) == FD_READ) { 2364 buffer_track = raw_cmd->track; 2365 buffer_drive = current_drive; 2366 INFBOUND(buffer_max, nr_sectors + fsector_t); 2367 } 2368 cont->redo(); 2369 } 2370 2371 /* Compute maximal contiguous buffer size. */ 2372 static int buffer_chain_size(void) 2373 { 2374 struct bio_vec bv; 2375 int size; 2376 struct req_iterator iter; 2377 char *base; 2378 2379 base = bio_data(current_req->bio); 2380 size = 0; 2381 2382 rq_for_each_segment(bv, current_req, iter) { 2383 if (page_address(bv.bv_page) + bv.bv_offset != base + size) 2384 break; 2385 2386 size += bv.bv_len; 2387 } 2388 2389 return size >> 9; 2390 } 2391 2392 /* Compute the maximal transfer size */ 2393 static int transfer_size(int ssize, int max_sector, int max_size) 2394 { 2395 SUPBOUND(max_sector, fsector_t + max_size); 2396 2397 /* alignment */ 2398 max_sector -= (max_sector % _floppy->sect) % ssize; 2399 2400 /* transfer size, beginning not aligned */ 2401 current_count_sectors = max_sector - fsector_t; 2402 2403 return max_sector; 2404 } 2405 2406 /* 2407 * Move data from/to the track buffer to/from the buffer cache. 2408 */ 2409 static void copy_buffer(int ssize, int max_sector, int max_sector_2) 2410 { 2411 int remaining; /* number of transferred 512-byte sectors */ 2412 struct bio_vec bv; 2413 char *buffer; 2414 char *dma_buffer; 2415 int size; 2416 struct req_iterator iter; 2417 2418 max_sector = transfer_size(ssize, 2419 min(max_sector, max_sector_2), 2420 blk_rq_sectors(current_req)); 2421 2422 if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE && 2423 buffer_max > fsector_t + blk_rq_sectors(current_req)) 2424 current_count_sectors = min_t(int, buffer_max - fsector_t, 2425 blk_rq_sectors(current_req)); 2426 2427 remaining = current_count_sectors << 9; 2428 if (remaining > blk_rq_bytes(current_req) && CT(COMMAND) == FD_WRITE) { 2429 DPRINT("in copy buffer\n"); 2430 pr_info("current_count_sectors=%ld\n", current_count_sectors); 2431 pr_info("remaining=%d\n", remaining >> 9); 2432 pr_info("current_req->nr_sectors=%u\n", 2433 blk_rq_sectors(current_req)); 2434 pr_info("current_req->current_nr_sectors=%u\n", 2435 blk_rq_cur_sectors(current_req)); 2436 pr_info("max_sector=%d\n", max_sector); 2437 pr_info("ssize=%d\n", ssize); 2438 } 2439 2440 buffer_max = max(max_sector, buffer_max); 2441 2442 dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9); 2443 2444 size = blk_rq_cur_bytes(current_req); 2445 2446 rq_for_each_segment(bv, current_req, iter) { 2447 if (!remaining) 2448 break; 2449 2450 size = bv.bv_len; 2451 SUPBOUND(size, remaining); 2452 2453 buffer = page_address(bv.bv_page) + bv.bv_offset; 2454 if (dma_buffer + size > 2455 floppy_track_buffer + (max_buffer_sectors << 10) || 2456 dma_buffer < floppy_track_buffer) { 2457 DPRINT("buffer overrun in copy buffer %d\n", 2458 (int)((floppy_track_buffer - dma_buffer) >> 9)); 2459 pr_info("fsector_t=%d buffer_min=%d\n", 2460 fsector_t, buffer_min); 2461 pr_info("current_count_sectors=%ld\n", 2462 current_count_sectors); 2463 if (CT(COMMAND) == FD_READ) 2464 pr_info("read\n"); 2465 if (CT(COMMAND) == FD_WRITE) 2466 pr_info("write\n"); 2467 break; 2468 } 2469 if (((unsigned long)buffer) % 512) 2470 DPRINT("%p buffer not aligned\n", buffer); 2471 2472 if (CT(COMMAND) == FD_READ) 2473 memcpy(buffer, dma_buffer, size); 2474 else 2475 memcpy(dma_buffer, buffer, size); 2476 2477 remaining -= size; 2478 dma_buffer += size; 2479 } 2480 if (remaining) { 2481 if (remaining > 0) 2482 max_sector -= remaining >> 9; 2483 DPRINT("weirdness: remaining %d\n", remaining >> 9); 2484 } 2485 } 2486 2487 /* work around a bug in pseudo DMA 2488 * (on some FDCs) pseudo DMA does not stop when the CPU stops 2489 * sending data. Hence we need a different way to signal the 2490 * transfer length: We use SECT_PER_TRACK. Unfortunately, this 2491 * does not work with MT, hence we can only transfer one head at 2492 * a time 2493 */ 2494 static void virtualdmabug_workaround(void) 2495 { 2496 int hard_sectors; 2497 int end_sector; 2498 2499 if (CT(COMMAND) == FD_WRITE) { 2500 COMMAND &= ~0x80; /* switch off multiple track mode */ 2501 2502 hard_sectors = raw_cmd->length >> (7 + SIZECODE); 2503 end_sector = SECTOR + hard_sectors - 1; 2504 if (end_sector > SECT_PER_TRACK) { 2505 pr_info("too many sectors %d > %d\n", 2506 end_sector, SECT_PER_TRACK); 2507 return; 2508 } 2509 SECT_PER_TRACK = end_sector; 2510 /* make sure SECT_PER_TRACK 2511 * points to end of transfer */ 2512 } 2513 } 2514 2515 /* 2516 * Formulate a read/write request. 2517 * this routine decides where to load the data (directly to buffer, or to 2518 * tmp floppy area), how much data to load (the size of the buffer, the whole 2519 * track, or a single sector) 2520 * All floppy_track_buffer handling goes in here. If we ever add track buffer 2521 * allocation on the fly, it should be done here. No other part should need 2522 * modification. 2523 */ 2524 2525 static int make_raw_rw_request(void) 2526 { 2527 int aligned_sector_t; 2528 int max_sector; 2529 int max_size; 2530 int tracksize; 2531 int ssize; 2532 2533 if (WARN(max_buffer_sectors == 0, "VFS: Block I/O scheduled on unopened device\n")) 2534 return 0; 2535 2536 set_fdc((long)current_req->rq_disk->private_data); 2537 2538 raw_cmd = &default_raw_cmd; 2539 raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK; 2540 raw_cmd->cmd_count = NR_RW; 2541 if (rq_data_dir(current_req) == READ) { 2542 raw_cmd->flags |= FD_RAW_READ; 2543 COMMAND = FM_MODE(_floppy, FD_READ); 2544 } else if (rq_data_dir(current_req) == WRITE) { 2545 raw_cmd->flags |= FD_RAW_WRITE; 2546 COMMAND = FM_MODE(_floppy, FD_WRITE); 2547 } else { 2548 DPRINT("%s: unknown command\n", __func__); 2549 return 0; 2550 } 2551 2552 max_sector = _floppy->sect * _floppy->head; 2553 2554 TRACK = (int)blk_rq_pos(current_req) / max_sector; 2555 fsector_t = (int)blk_rq_pos(current_req) % max_sector; 2556 if (_floppy->track && TRACK >= _floppy->track) { 2557 if (blk_rq_cur_sectors(current_req) & 1) { 2558 current_count_sectors = 1; 2559 return 1; 2560 } else 2561 return 0; 2562 } 2563 HEAD = fsector_t / _floppy->sect; 2564 2565 if (((_floppy->stretch & (FD_SWAPSIDES | FD_SECTBASEMASK)) || 2566 test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags)) && 2567 fsector_t < _floppy->sect) 2568 max_sector = _floppy->sect; 2569 2570 /* 2M disks have phantom sectors on the first track */ 2571 if ((_floppy->rate & FD_2M) && (!TRACK) && (!HEAD)) { 2572 max_sector = 2 * _floppy->sect / 3; 2573 if (fsector_t >= max_sector) { 2574 current_count_sectors = 2575 min_t(int, _floppy->sect - fsector_t, 2576 blk_rq_sectors(current_req)); 2577 return 1; 2578 } 2579 SIZECODE = 2; 2580 } else 2581 SIZECODE = FD_SIZECODE(_floppy); 2582 raw_cmd->rate = _floppy->rate & 0x43; 2583 if ((_floppy->rate & FD_2M) && (TRACK || HEAD) && raw_cmd->rate == 2) 2584 raw_cmd->rate = 1; 2585 2586 if (SIZECODE) 2587 SIZECODE2 = 0xff; 2588 else 2589 SIZECODE2 = 0x80; 2590 raw_cmd->track = TRACK << STRETCH(_floppy); 2591 DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, HEAD); 2592 GAP = _floppy->gap; 2593 ssize = DIV_ROUND_UP(1 << SIZECODE, 4); 2594 SECT_PER_TRACK = _floppy->sect << 2 >> SIZECODE; 2595 SECTOR = ((fsector_t % _floppy->sect) << 2 >> SIZECODE) + 2596 FD_SECTBASE(_floppy); 2597 2598 /* tracksize describes the size which can be filled up with sectors 2599 * of size ssize. 2600 */ 2601 tracksize = _floppy->sect - _floppy->sect % ssize; 2602 if (tracksize < _floppy->sect) { 2603 SECT_PER_TRACK++; 2604 if (tracksize <= fsector_t % _floppy->sect) 2605 SECTOR--; 2606 2607 /* if we are beyond tracksize, fill up using smaller sectors */ 2608 while (tracksize <= fsector_t % _floppy->sect) { 2609 while (tracksize + ssize > _floppy->sect) { 2610 SIZECODE--; 2611 ssize >>= 1; 2612 } 2613 SECTOR++; 2614 SECT_PER_TRACK++; 2615 tracksize += ssize; 2616 } 2617 max_sector = HEAD * _floppy->sect + tracksize; 2618 } else if (!TRACK && !HEAD && !(_floppy->rate & FD_2M) && probing) { 2619 max_sector = _floppy->sect; 2620 } else if (!HEAD && CT(COMMAND) == FD_WRITE) { 2621 /* for virtual DMA bug workaround */ 2622 max_sector = _floppy->sect; 2623 } 2624 2625 in_sector_offset = (fsector_t % _floppy->sect) % ssize; 2626 aligned_sector_t = fsector_t - in_sector_offset; 2627 max_size = blk_rq_sectors(current_req); 2628 if ((raw_cmd->track == buffer_track) && 2629 (current_drive == buffer_drive) && 2630 (fsector_t >= buffer_min) && (fsector_t < buffer_max)) { 2631 /* data already in track buffer */ 2632 if (CT(COMMAND) == FD_READ) { 2633 copy_buffer(1, max_sector, buffer_max); 2634 return 1; 2635 } 2636 } else if (in_sector_offset || blk_rq_sectors(current_req) < ssize) { 2637 if (CT(COMMAND) == FD_WRITE) { 2638 unsigned int sectors; 2639 2640 sectors = fsector_t + blk_rq_sectors(current_req); 2641 if (sectors > ssize && sectors < ssize + ssize) 2642 max_size = ssize + ssize; 2643 else 2644 max_size = ssize; 2645 } 2646 raw_cmd->flags &= ~FD_RAW_WRITE; 2647 raw_cmd->flags |= FD_RAW_READ; 2648 COMMAND = FM_MODE(_floppy, FD_READ); 2649 } else if ((unsigned long)bio_data(current_req->bio) < MAX_DMA_ADDRESS) { 2650 unsigned long dma_limit; 2651 int direct, indirect; 2652 2653 indirect = 2654 transfer_size(ssize, max_sector, 2655 max_buffer_sectors * 2) - fsector_t; 2656 2657 /* 2658 * Do NOT use minimum() here---MAX_DMA_ADDRESS is 64 bits wide 2659 * on a 64 bit machine! 2660 */ 2661 max_size = buffer_chain_size(); 2662 dma_limit = (MAX_DMA_ADDRESS - 2663 ((unsigned long)bio_data(current_req->bio))) >> 9; 2664 if ((unsigned long)max_size > dma_limit) 2665 max_size = dma_limit; 2666 /* 64 kb boundaries */ 2667 if (CROSS_64KB(bio_data(current_req->bio), max_size << 9)) 2668 max_size = (K_64 - 2669 ((unsigned long)bio_data(current_req->bio)) % 2670 K_64) >> 9; 2671 direct = transfer_size(ssize, max_sector, max_size) - fsector_t; 2672 /* 2673 * We try to read tracks, but if we get too many errors, we 2674 * go back to reading just one sector at a time. 2675 * 2676 * This means we should be able to read a sector even if there 2677 * are other bad sectors on this track. 2678 */ 2679 if (!direct || 2680 (indirect * 2 > direct * 3 && 2681 *errors < DP->max_errors.read_track && 2682 ((!probing || 2683 (DP->read_track & (1 << DRS->probed_format)))))) { 2684 max_size = blk_rq_sectors(current_req); 2685 } else { 2686 raw_cmd->kernel_data = bio_data(current_req->bio); 2687 raw_cmd->length = current_count_sectors << 9; 2688 if (raw_cmd->length == 0) { 2689 DPRINT("%s: zero dma transfer attempted\n", __func__); 2690 DPRINT("indirect=%d direct=%d fsector_t=%d\n", 2691 indirect, direct, fsector_t); 2692 return 0; 2693 } 2694 virtualdmabug_workaround(); 2695 return 2; 2696 } 2697 } 2698 2699 if (CT(COMMAND) == FD_READ) 2700 max_size = max_sector; /* unbounded */ 2701 2702 /* claim buffer track if needed */ 2703 if (buffer_track != raw_cmd->track || /* bad track */ 2704 buffer_drive != current_drive || /* bad drive */ 2705 fsector_t > buffer_max || 2706 fsector_t < buffer_min || 2707 ((CT(COMMAND) == FD_READ || 2708 (!in_sector_offset && blk_rq_sectors(current_req) >= ssize)) && 2709 max_sector > 2 * max_buffer_sectors + buffer_min && 2710 max_size + fsector_t > 2 * max_buffer_sectors + buffer_min)) { 2711 /* not enough space */ 2712 buffer_track = -1; 2713 buffer_drive = current_drive; 2714 buffer_max = buffer_min = aligned_sector_t; 2715 } 2716 raw_cmd->kernel_data = floppy_track_buffer + 2717 ((aligned_sector_t - buffer_min) << 9); 2718 2719 if (CT(COMMAND) == FD_WRITE) { 2720 /* copy write buffer to track buffer. 2721 * if we get here, we know that the write 2722 * is either aligned or the data already in the buffer 2723 * (buffer will be overwritten) */ 2724 if (in_sector_offset && buffer_track == -1) 2725 DPRINT("internal error offset !=0 on write\n"); 2726 buffer_track = raw_cmd->track; 2727 buffer_drive = current_drive; 2728 copy_buffer(ssize, max_sector, 2729 2 * max_buffer_sectors + buffer_min); 2730 } else 2731 transfer_size(ssize, max_sector, 2732 2 * max_buffer_sectors + buffer_min - 2733 aligned_sector_t); 2734 2735 /* round up current_count_sectors to get dma xfer size */ 2736 raw_cmd->length = in_sector_offset + current_count_sectors; 2737 raw_cmd->length = ((raw_cmd->length - 1) | (ssize - 1)) + 1; 2738 raw_cmd->length <<= 9; 2739 if ((raw_cmd->length < current_count_sectors << 9) || 2740 (raw_cmd->kernel_data != bio_data(current_req->bio) && 2741 CT(COMMAND) == FD_WRITE && 2742 (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max || 2743 aligned_sector_t < buffer_min)) || 2744 raw_cmd->length % (128 << SIZECODE) || 2745 raw_cmd->length <= 0 || current_count_sectors <= 0) { 2746 DPRINT("fractionary current count b=%lx s=%lx\n", 2747 raw_cmd->length, current_count_sectors); 2748 if (raw_cmd->kernel_data != bio_data(current_req->bio)) 2749 pr_info("addr=%d, length=%ld\n", 2750 (int)((raw_cmd->kernel_data - 2751 floppy_track_buffer) >> 9), 2752 current_count_sectors); 2753 pr_info("st=%d ast=%d mse=%d msi=%d\n", 2754 fsector_t, aligned_sector_t, max_sector, max_size); 2755 pr_info("ssize=%x SIZECODE=%d\n", ssize, SIZECODE); 2756 pr_info("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n", 2757 COMMAND, SECTOR, HEAD, TRACK); 2758 pr_info("buffer drive=%d\n", buffer_drive); 2759 pr_info("buffer track=%d\n", buffer_track); 2760 pr_info("buffer_min=%d\n", buffer_min); 2761 pr_info("buffer_max=%d\n", buffer_max); 2762 return 0; 2763 } 2764 2765 if (raw_cmd->kernel_data != bio_data(current_req->bio)) { 2766 if (raw_cmd->kernel_data < floppy_track_buffer || 2767 current_count_sectors < 0 || 2768 raw_cmd->length < 0 || 2769 raw_cmd->kernel_data + raw_cmd->length > 2770 floppy_track_buffer + (max_buffer_sectors << 10)) { 2771 DPRINT("buffer overrun in schedule dma\n"); 2772 pr_info("fsector_t=%d buffer_min=%d current_count=%ld\n", 2773 fsector_t, buffer_min, raw_cmd->length >> 9); 2774 pr_info("current_count_sectors=%ld\n", 2775 current_count_sectors); 2776 if (CT(COMMAND) == FD_READ) 2777 pr_info("read\n"); 2778 if (CT(COMMAND) == FD_WRITE) 2779 pr_info("write\n"); 2780 return 0; 2781 } 2782 } else if (raw_cmd->length > blk_rq_bytes(current_req) || 2783 current_count_sectors > blk_rq_sectors(current_req)) { 2784 DPRINT("buffer overrun in direct transfer\n"); 2785 return 0; 2786 } else if (raw_cmd->length < current_count_sectors << 9) { 2787 DPRINT("more sectors than bytes\n"); 2788 pr_info("bytes=%ld\n", raw_cmd->length >> 9); 2789 pr_info("sectors=%ld\n", current_count_sectors); 2790 } 2791 if (raw_cmd->length == 0) { 2792 DPRINT("zero dma transfer attempted from make_raw_request\n"); 2793 return 0; 2794 } 2795 2796 virtualdmabug_workaround(); 2797 return 2; 2798 } 2799 2800 /* 2801 * Round-robin between our available drives, doing one request from each 2802 */ 2803 static int set_next_request(void) 2804 { 2805 struct request_queue *q; 2806 int old_pos = fdc_queue; 2807 2808 do { 2809 q = disks[fdc_queue]->queue; 2810 if (++fdc_queue == N_DRIVE) 2811 fdc_queue = 0; 2812 if (q) { 2813 current_req = blk_fetch_request(q); 2814 if (current_req) { 2815 current_req->error_count = 0; 2816 break; 2817 } 2818 } 2819 } while (fdc_queue != old_pos); 2820 2821 return current_req != NULL; 2822 } 2823 2824 static void redo_fd_request(void) 2825 { 2826 int drive; 2827 int tmp; 2828 2829 lastredo = jiffies; 2830 if (current_drive < N_DRIVE) 2831 floppy_off(current_drive); 2832 2833 do_request: 2834 if (!current_req) { 2835 int pending; 2836 2837 spin_lock_irq(&floppy_lock); 2838 pending = set_next_request(); 2839 spin_unlock_irq(&floppy_lock); 2840 if (!pending) { 2841 do_floppy = NULL; 2842 unlock_fdc(); 2843 return; 2844 } 2845 } 2846 drive = (long)current_req->rq_disk->private_data; 2847 set_fdc(drive); 2848 reschedule_timeout(current_reqD, "redo fd request"); 2849 2850 set_floppy(drive); 2851 raw_cmd = &default_raw_cmd; 2852 raw_cmd->flags = 0; 2853 if (start_motor(redo_fd_request)) 2854 return; 2855 2856 disk_change(current_drive); 2857 if (test_bit(current_drive, &fake_change) || 2858 test_bit(FD_DISK_CHANGED_BIT, &DRS->flags)) { 2859 DPRINT("disk absent or changed during operation\n"); 2860 request_done(0); 2861 goto do_request; 2862 } 2863 if (!_floppy) { /* Autodetection */ 2864 if (!probing) { 2865 DRS->probed_format = 0; 2866 if (next_valid_format()) { 2867 DPRINT("no autodetectable formats\n"); 2868 _floppy = NULL; 2869 request_done(0); 2870 goto do_request; 2871 } 2872 } 2873 probing = 1; 2874 _floppy = floppy_type + DP->autodetect[DRS->probed_format]; 2875 } else 2876 probing = 0; 2877 errors = &(current_req->error_count); 2878 tmp = make_raw_rw_request(); 2879 if (tmp < 2) { 2880 request_done(tmp); 2881 goto do_request; 2882 } 2883 2884 if (test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags)) 2885 twaddle(); 2886 schedule_bh(floppy_start); 2887 debugt(__func__, "queue fd request"); 2888 return; 2889 } 2890 2891 static const struct cont_t rw_cont = { 2892 .interrupt = rw_interrupt, 2893 .redo = redo_fd_request, 2894 .error = bad_flp_intr, 2895 .done = request_done 2896 }; 2897 2898 static void process_fd_request(void) 2899 { 2900 cont = &rw_cont; 2901 schedule_bh(redo_fd_request); 2902 } 2903 2904 static void do_fd_request(struct request_queue *q) 2905 { 2906 if (WARN(max_buffer_sectors == 0, 2907 "VFS: %s called on non-open device\n", __func__)) 2908 return; 2909 2910 if (WARN(atomic_read(&usage_count) == 0, 2911 "warning: usage count=0, current_req=%p sect=%ld flags=%llx\n", 2912 current_req, (long)blk_rq_pos(current_req), 2913 (unsigned long long) current_req->cmd_flags)) 2914 return; 2915 2916 if (test_and_set_bit(0, &fdc_busy)) { 2917 /* fdc busy, this new request will be treated when the 2918 current one is done */ 2919 is_alive(__func__, "old request running"); 2920 return; 2921 } 2922 command_status = FD_COMMAND_NONE; 2923 __reschedule_timeout(MAXTIMEOUT, "fd_request"); 2924 set_fdc(0); 2925 process_fd_request(); 2926 is_alive(__func__, ""); 2927 } 2928 2929 static const struct cont_t poll_cont = { 2930 .interrupt = success_and_wakeup, 2931 .redo = floppy_ready, 2932 .error = generic_failure, 2933 .done = generic_done 2934 }; 2935 2936 static int poll_drive(bool interruptible, int flag) 2937 { 2938 /* no auto-sense, just clear dcl */ 2939 raw_cmd = &default_raw_cmd; 2940 raw_cmd->flags = flag; 2941 raw_cmd->track = 0; 2942 raw_cmd->cmd_count = 0; 2943 cont = &poll_cont; 2944 debug_dcl(DP->flags, "setting NEWCHANGE in poll_drive\n"); 2945 set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags); 2946 2947 return wait_til_done(floppy_ready, interruptible); 2948 } 2949 2950 /* 2951 * User triggered reset 2952 * ==================== 2953 */ 2954 2955 static void reset_intr(void) 2956 { 2957 pr_info("weird, reset interrupt called\n"); 2958 } 2959 2960 static const struct cont_t reset_cont = { 2961 .interrupt = reset_intr, 2962 .redo = success_and_wakeup, 2963 .error = generic_failure, 2964 .done = generic_done 2965 }; 2966 2967 static int user_reset_fdc(int drive, int arg, bool interruptible) 2968 { 2969 int ret; 2970 2971 if (lock_fdc(drive)) 2972 return -EINTR; 2973 2974 if (arg == FD_RESET_ALWAYS) 2975 FDCS->reset = 1; 2976 if (FDCS->reset) { 2977 cont = &reset_cont; 2978 ret = wait_til_done(reset_fdc, interruptible); 2979 if (ret == -EINTR) 2980 return -EINTR; 2981 } 2982 process_fd_request(); 2983 return 0; 2984 } 2985 2986 /* 2987 * Misc Ioctl's and support 2988 * ======================== 2989 */ 2990 static inline int fd_copyout(void __user *param, const void *address, 2991 unsigned long size) 2992 { 2993 return copy_to_user(param, address, size) ? -EFAULT : 0; 2994 } 2995 2996 static inline int fd_copyin(void __user *param, void *address, 2997 unsigned long size) 2998 { 2999 return copy_from_user(address, param, size) ? -EFAULT : 0; 3000 } 3001 3002 static const char *drive_name(int type, int drive) 3003 { 3004 struct floppy_struct *floppy; 3005 3006 if (type) 3007 floppy = floppy_type + type; 3008 else { 3009 if (UDP->native_format) 3010 floppy = floppy_type + UDP->native_format; 3011 else 3012 return "(null)"; 3013 } 3014 if (floppy->name) 3015 return floppy->name; 3016 else 3017 return "(null)"; 3018 } 3019 3020 /* raw commands */ 3021 static void raw_cmd_done(int flag) 3022 { 3023 int i; 3024 3025 if (!flag) { 3026 raw_cmd->flags |= FD_RAW_FAILURE; 3027 raw_cmd->flags |= FD_RAW_HARDFAILURE; 3028 } else { 3029 raw_cmd->reply_count = inr; 3030 if (raw_cmd->reply_count > MAX_REPLIES) 3031 raw_cmd->reply_count = 0; 3032 for (i = 0; i < raw_cmd->reply_count; i++) 3033 raw_cmd->reply[i] = reply_buffer[i]; 3034 3035 if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE)) { 3036 unsigned long flags; 3037 flags = claim_dma_lock(); 3038 raw_cmd->length = fd_get_dma_residue(); 3039 release_dma_lock(flags); 3040 } 3041 3042 if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) && 3043 (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0))) 3044 raw_cmd->flags |= FD_RAW_FAILURE; 3045 3046 if (disk_change(current_drive)) 3047 raw_cmd->flags |= FD_RAW_DISK_CHANGE; 3048 else 3049 raw_cmd->flags &= ~FD_RAW_DISK_CHANGE; 3050 if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER) 3051 motor_off_callback(&motor_off_timer[current_drive]); 3052 3053 if (raw_cmd->next && 3054 (!(raw_cmd->flags & FD_RAW_FAILURE) || 3055 !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) && 3056 ((raw_cmd->flags & FD_RAW_FAILURE) || 3057 !(raw_cmd->flags & FD_RAW_STOP_IF_SUCCESS))) { 3058 raw_cmd = raw_cmd->next; 3059 return; 3060 } 3061 } 3062 generic_done(flag); 3063 } 3064 3065 static const struct cont_t raw_cmd_cont = { 3066 .interrupt = success_and_wakeup, 3067 .redo = floppy_start, 3068 .error = generic_failure, 3069 .done = raw_cmd_done 3070 }; 3071 3072 static int raw_cmd_copyout(int cmd, void __user *param, 3073 struct floppy_raw_cmd *ptr) 3074 { 3075 int ret; 3076 3077 while (ptr) { 3078 struct floppy_raw_cmd cmd = *ptr; 3079 cmd.next = NULL; 3080 cmd.kernel_data = NULL; 3081 ret = copy_to_user(param, &cmd, sizeof(cmd)); 3082 if (ret) 3083 return -EFAULT; 3084 param += sizeof(struct floppy_raw_cmd); 3085 if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) { 3086 if (ptr->length >= 0 && 3087 ptr->length <= ptr->buffer_length) { 3088 long length = ptr->buffer_length - ptr->length; 3089 ret = fd_copyout(ptr->data, ptr->kernel_data, 3090 length); 3091 if (ret) 3092 return ret; 3093 } 3094 } 3095 ptr = ptr->next; 3096 } 3097 3098 return 0; 3099 } 3100 3101 static void raw_cmd_free(struct floppy_raw_cmd **ptr) 3102 { 3103 struct floppy_raw_cmd *next; 3104 struct floppy_raw_cmd *this; 3105 3106 this = *ptr; 3107 *ptr = NULL; 3108 while (this) { 3109 if (this->buffer_length) { 3110 fd_dma_mem_free((unsigned long)this->kernel_data, 3111 this->buffer_length); 3112 this->buffer_length = 0; 3113 } 3114 next = this->next; 3115 kfree(this); 3116 this = next; 3117 } 3118 } 3119 3120 static int raw_cmd_copyin(int cmd, void __user *param, 3121 struct floppy_raw_cmd **rcmd) 3122 { 3123 struct floppy_raw_cmd *ptr; 3124 int ret; 3125 int i; 3126 3127 *rcmd = NULL; 3128 3129 loop: 3130 ptr = kmalloc(sizeof(struct floppy_raw_cmd), GFP_KERNEL); 3131 if (!ptr) 3132 return -ENOMEM; 3133 *rcmd = ptr; 3134 ret = copy_from_user(ptr, param, sizeof(*ptr)); 3135 ptr->next = NULL; 3136 ptr->buffer_length = 0; 3137 ptr->kernel_data = NULL; 3138 if (ret) 3139 return -EFAULT; 3140 param += sizeof(struct floppy_raw_cmd); 3141 if (ptr->cmd_count > 33) 3142 /* the command may now also take up the space 3143 * initially intended for the reply & the 3144 * reply count. Needed for long 82078 commands 3145 * such as RESTORE, which takes ... 17 command 3146 * bytes. Murphy's law #137: When you reserve 3147 * 16 bytes for a structure, you'll one day 3148 * discover that you really need 17... 3149 */ 3150 return -EINVAL; 3151 3152 for (i = 0; i < 16; i++) 3153 ptr->reply[i] = 0; 3154 ptr->resultcode = 0; 3155 3156 if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) { 3157 if (ptr->length <= 0) 3158 return -EINVAL; 3159 ptr->kernel_data = (char *)fd_dma_mem_alloc(ptr->length); 3160 fallback_on_nodma_alloc(&ptr->kernel_data, ptr->length); 3161 if (!ptr->kernel_data) 3162 return -ENOMEM; 3163 ptr->buffer_length = ptr->length; 3164 } 3165 if (ptr->flags & FD_RAW_WRITE) { 3166 ret = fd_copyin(ptr->data, ptr->kernel_data, ptr->length); 3167 if (ret) 3168 return ret; 3169 } 3170 3171 if (ptr->flags & FD_RAW_MORE) { 3172 rcmd = &(ptr->next); 3173 ptr->rate &= 0x43; 3174 goto loop; 3175 } 3176 3177 return 0; 3178 } 3179 3180 static int raw_cmd_ioctl(int cmd, void __user *param) 3181 { 3182 struct floppy_raw_cmd *my_raw_cmd; 3183 int drive; 3184 int ret2; 3185 int ret; 3186 3187 if (FDCS->rawcmd <= 1) 3188 FDCS->rawcmd = 1; 3189 for (drive = 0; drive < N_DRIVE; drive++) { 3190 if (FDC(drive) != fdc) 3191 continue; 3192 if (drive == current_drive) { 3193 if (UDRS->fd_ref > 1) { 3194 FDCS->rawcmd = 2; 3195 break; 3196 } 3197 } else if (UDRS->fd_ref) { 3198 FDCS->rawcmd = 2; 3199 break; 3200 } 3201 } 3202 3203 if (FDCS->reset) 3204 return -EIO; 3205 3206 ret = raw_cmd_copyin(cmd, param, &my_raw_cmd); 3207 if (ret) { 3208 raw_cmd_free(&my_raw_cmd); 3209 return ret; 3210 } 3211 3212 raw_cmd = my_raw_cmd; 3213 cont = &raw_cmd_cont; 3214 ret = wait_til_done(floppy_start, true); 3215 debug_dcl(DP->flags, "calling disk change from raw_cmd ioctl\n"); 3216 3217 if (ret != -EINTR && FDCS->reset) 3218 ret = -EIO; 3219 3220 DRS->track = NO_TRACK; 3221 3222 ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd); 3223 if (!ret) 3224 ret = ret2; 3225 raw_cmd_free(&my_raw_cmd); 3226 return ret; 3227 } 3228 3229 static int invalidate_drive(struct block_device *bdev) 3230 { 3231 /* invalidate the buffer track to force a reread */ 3232 set_bit((long)bdev->bd_disk->private_data, &fake_change); 3233 process_fd_request(); 3234 check_disk_change(bdev); 3235 return 0; 3236 } 3237 3238 static int set_geometry(unsigned int cmd, struct floppy_struct *g, 3239 int drive, int type, struct block_device *bdev) 3240 { 3241 int cnt; 3242 3243 /* sanity checking for parameters. */ 3244 if (g->sect <= 0 || 3245 g->head <= 0 || 3246 g->track <= 0 || g->track > UDP->tracks >> STRETCH(g) || 3247 /* check if reserved bits are set */ 3248 (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_SECTBASEMASK)) != 0) 3249 return -EINVAL; 3250 if (type) { 3251 if (!capable(CAP_SYS_ADMIN)) 3252 return -EPERM; 3253 mutex_lock(&open_lock); 3254 if (lock_fdc(drive)) { 3255 mutex_unlock(&open_lock); 3256 return -EINTR; 3257 } 3258 floppy_type[type] = *g; 3259 floppy_type[type].name = "user format"; 3260 for (cnt = type << 2; cnt < (type << 2) + 4; cnt++) 3261 floppy_sizes[cnt] = floppy_sizes[cnt + 0x80] = 3262 floppy_type[type].size + 1; 3263 process_fd_request(); 3264 for (cnt = 0; cnt < N_DRIVE; cnt++) { 3265 struct block_device *bdev = opened_bdev[cnt]; 3266 if (!bdev || ITYPE(drive_state[cnt].fd_device) != type) 3267 continue; 3268 __invalidate_device(bdev, true); 3269 } 3270 mutex_unlock(&open_lock); 3271 } else { 3272 int oldStretch; 3273 3274 if (lock_fdc(drive)) 3275 return -EINTR; 3276 if (cmd != FDDEFPRM) { 3277 /* notice a disk change immediately, else 3278 * we lose our settings immediately*/ 3279 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR) 3280 return -EINTR; 3281 } 3282 oldStretch = g->stretch; 3283 user_params[drive] = *g; 3284 if (buffer_drive == drive) 3285 SUPBOUND(buffer_max, user_params[drive].sect); 3286 current_type[drive] = &user_params[drive]; 3287 floppy_sizes[drive] = user_params[drive].size; 3288 if (cmd == FDDEFPRM) 3289 DRS->keep_data = -1; 3290 else 3291 DRS->keep_data = 1; 3292 /* invalidation. Invalidate only when needed, i.e. 3293 * when there are already sectors in the buffer cache 3294 * whose number will change. This is useful, because 3295 * mtools often changes the geometry of the disk after 3296 * looking at the boot block */ 3297 if (DRS->maxblock > user_params[drive].sect || 3298 DRS->maxtrack || 3299 ((user_params[drive].sect ^ oldStretch) & 3300 (FD_SWAPSIDES | FD_SECTBASEMASK))) 3301 invalidate_drive(bdev); 3302 else 3303 process_fd_request(); 3304 } 3305 return 0; 3306 } 3307 3308 /* handle obsolete ioctl's */ 3309 static unsigned int ioctl_table[] = { 3310 FDCLRPRM, 3311 FDSETPRM, 3312 FDDEFPRM, 3313 FDGETPRM, 3314 FDMSGON, 3315 FDMSGOFF, 3316 FDFMTBEG, 3317 FDFMTTRK, 3318 FDFMTEND, 3319 FDSETEMSGTRESH, 3320 FDFLUSH, 3321 FDSETMAXERRS, 3322 FDGETMAXERRS, 3323 FDGETDRVTYP, 3324 FDSETDRVPRM, 3325 FDGETDRVPRM, 3326 FDGETDRVSTAT, 3327 FDPOLLDRVSTAT, 3328 FDRESET, 3329 FDGETFDCSTAT, 3330 FDWERRORCLR, 3331 FDWERRORGET, 3332 FDRAWCMD, 3333 FDEJECT, 3334 FDTWADDLE 3335 }; 3336 3337 static int normalize_ioctl(unsigned int *cmd, int *size) 3338 { 3339 int i; 3340 3341 for (i = 0; i < ARRAY_SIZE(ioctl_table); i++) { 3342 if ((*cmd & 0xffff) == (ioctl_table[i] & 0xffff)) { 3343 *size = _IOC_SIZE(*cmd); 3344 *cmd = ioctl_table[i]; 3345 if (*size > _IOC_SIZE(*cmd)) { 3346 pr_info("ioctl not yet supported\n"); 3347 return -EFAULT; 3348 } 3349 return 0; 3350 } 3351 } 3352 return -EINVAL; 3353 } 3354 3355 static int get_floppy_geometry(int drive, int type, struct floppy_struct **g) 3356 { 3357 if (type) 3358 *g = &floppy_type[type]; 3359 else { 3360 if (lock_fdc(drive)) 3361 return -EINTR; 3362 if (poll_drive(false, 0) == -EINTR) 3363 return -EINTR; 3364 process_fd_request(); 3365 *g = current_type[drive]; 3366 } 3367 if (!*g) 3368 return -ENODEV; 3369 return 0; 3370 } 3371 3372 static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 3373 { 3374 int drive = (long)bdev->bd_disk->private_data; 3375 int type = ITYPE(drive_state[drive].fd_device); 3376 struct floppy_struct *g; 3377 int ret; 3378 3379 ret = get_floppy_geometry(drive, type, &g); 3380 if (ret) 3381 return ret; 3382 3383 geo->heads = g->head; 3384 geo->sectors = g->sect; 3385 geo->cylinders = g->track; 3386 return 0; 3387 } 3388 3389 static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, 3390 unsigned long param) 3391 { 3392 int drive = (long)bdev->bd_disk->private_data; 3393 int type = ITYPE(UDRS->fd_device); 3394 int i; 3395 int ret; 3396 int size; 3397 union inparam { 3398 struct floppy_struct g; /* geometry */ 3399 struct format_descr f; 3400 struct floppy_max_errors max_errors; 3401 struct floppy_drive_params dp; 3402 } inparam; /* parameters coming from user space */ 3403 const void *outparam; /* parameters passed back to user space */ 3404 3405 /* convert compatibility eject ioctls into floppy eject ioctl. 3406 * We do this in order to provide a means to eject floppy disks before 3407 * installing the new fdutils package */ 3408 if (cmd == CDROMEJECT || /* CD-ROM eject */ 3409 cmd == 0x6470) { /* SunOS floppy eject */ 3410 DPRINT("obsolete eject ioctl\n"); 3411 DPRINT("please use floppycontrol --eject\n"); 3412 cmd = FDEJECT; 3413 } 3414 3415 if (!((cmd & 0xff00) == 0x0200)) 3416 return -EINVAL; 3417 3418 /* convert the old style command into a new style command */ 3419 ret = normalize_ioctl(&cmd, &size); 3420 if (ret) 3421 return ret; 3422 3423 /* permission checks */ 3424 if (((cmd & 0x40) && !(mode & (FMODE_WRITE | FMODE_WRITE_IOCTL))) || 3425 ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))) 3426 return -EPERM; 3427 3428 if (WARN_ON(size < 0 || size > sizeof(inparam))) 3429 return -EINVAL; 3430 3431 /* copyin */ 3432 memset(&inparam, 0, sizeof(inparam)); 3433 if (_IOC_DIR(cmd) & _IOC_WRITE) { 3434 ret = fd_copyin((void __user *)param, &inparam, size); 3435 if (ret) 3436 return ret; 3437 } 3438 3439 switch (cmd) { 3440 case FDEJECT: 3441 if (UDRS->fd_ref != 1) 3442 /* somebody else has this drive open */ 3443 return -EBUSY; 3444 if (lock_fdc(drive)) 3445 return -EINTR; 3446 3447 /* do the actual eject. Fails on 3448 * non-Sparc architectures */ 3449 ret = fd_eject(UNIT(drive)); 3450 3451 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags); 3452 set_bit(FD_VERIFY_BIT, &UDRS->flags); 3453 process_fd_request(); 3454 return ret; 3455 case FDCLRPRM: 3456 if (lock_fdc(drive)) 3457 return -EINTR; 3458 current_type[drive] = NULL; 3459 floppy_sizes[drive] = MAX_DISK_SIZE << 1; 3460 UDRS->keep_data = 0; 3461 return invalidate_drive(bdev); 3462 case FDSETPRM: 3463 case FDDEFPRM: 3464 return set_geometry(cmd, &inparam.g, drive, type, bdev); 3465 case FDGETPRM: 3466 ret = get_floppy_geometry(drive, type, 3467 (struct floppy_struct **)&outparam); 3468 if (ret) 3469 return ret; 3470 break; 3471 case FDMSGON: 3472 UDP->flags |= FTD_MSG; 3473 return 0; 3474 case FDMSGOFF: 3475 UDP->flags &= ~FTD_MSG; 3476 return 0; 3477 case FDFMTBEG: 3478 if (lock_fdc(drive)) 3479 return -EINTR; 3480 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR) 3481 return -EINTR; 3482 ret = UDRS->flags; 3483 process_fd_request(); 3484 if (ret & FD_VERIFY) 3485 return -ENODEV; 3486 if (!(ret & FD_DISK_WRITABLE)) 3487 return -EROFS; 3488 return 0; 3489 case FDFMTTRK: 3490 if (UDRS->fd_ref != 1) 3491 return -EBUSY; 3492 return do_format(drive, &inparam.f); 3493 case FDFMTEND: 3494 case FDFLUSH: 3495 if (lock_fdc(drive)) 3496 return -EINTR; 3497 return invalidate_drive(bdev); 3498 case FDSETEMSGTRESH: 3499 UDP->max_errors.reporting = (unsigned short)(param & 0x0f); 3500 return 0; 3501 case FDGETMAXERRS: 3502 outparam = &UDP->max_errors; 3503 break; 3504 case FDSETMAXERRS: 3505 UDP->max_errors = inparam.max_errors; 3506 break; 3507 case FDGETDRVTYP: 3508 outparam = drive_name(type, drive); 3509 SUPBOUND(size, strlen((const char *)outparam) + 1); 3510 break; 3511 case FDSETDRVPRM: 3512 *UDP = inparam.dp; 3513 break; 3514 case FDGETDRVPRM: 3515 outparam = UDP; 3516 break; 3517 case FDPOLLDRVSTAT: 3518 if (lock_fdc(drive)) 3519 return -EINTR; 3520 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR) 3521 return -EINTR; 3522 process_fd_request(); 3523 /* fall through */ 3524 case FDGETDRVSTAT: 3525 outparam = UDRS; 3526 break; 3527 case FDRESET: 3528 return user_reset_fdc(drive, (int)param, true); 3529 case FDGETFDCSTAT: 3530 outparam = UFDCS; 3531 break; 3532 case FDWERRORCLR: 3533 memset(UDRWE, 0, sizeof(*UDRWE)); 3534 return 0; 3535 case FDWERRORGET: 3536 outparam = UDRWE; 3537 break; 3538 case FDRAWCMD: 3539 if (type) 3540 return -EINVAL; 3541 if (lock_fdc(drive)) 3542 return -EINTR; 3543 set_floppy(drive); 3544 i = raw_cmd_ioctl(cmd, (void __user *)param); 3545 if (i == -EINTR) 3546 return -EINTR; 3547 process_fd_request(); 3548 return i; 3549 case FDTWADDLE: 3550 if (lock_fdc(drive)) 3551 return -EINTR; 3552 twaddle(); 3553 process_fd_request(); 3554 return 0; 3555 default: 3556 return -EINVAL; 3557 } 3558 3559 if (_IOC_DIR(cmd) & _IOC_READ) 3560 return fd_copyout((void __user *)param, outparam, size); 3561 3562 return 0; 3563 } 3564 3565 static int fd_ioctl(struct block_device *bdev, fmode_t mode, 3566 unsigned int cmd, unsigned long param) 3567 { 3568 int ret; 3569 3570 mutex_lock(&floppy_mutex); 3571 ret = fd_locked_ioctl(bdev, mode, cmd, param); 3572 mutex_unlock(&floppy_mutex); 3573 3574 return ret; 3575 } 3576 3577 #ifdef CONFIG_COMPAT 3578 3579 struct compat_floppy_drive_params { 3580 char cmos; 3581 compat_ulong_t max_dtr; 3582 compat_ulong_t hlt; 3583 compat_ulong_t hut; 3584 compat_ulong_t srt; 3585 compat_ulong_t spinup; 3586 compat_ulong_t spindown; 3587 unsigned char spindown_offset; 3588 unsigned char select_delay; 3589 unsigned char rps; 3590 unsigned char tracks; 3591 compat_ulong_t timeout; 3592 unsigned char interleave_sect; 3593 struct floppy_max_errors max_errors; 3594 char flags; 3595 char read_track; 3596 short autodetect[8]; 3597 compat_int_t checkfreq; 3598 compat_int_t native_format; 3599 }; 3600 3601 struct compat_floppy_drive_struct { 3602 signed char flags; 3603 compat_ulong_t spinup_date; 3604 compat_ulong_t select_date; 3605 compat_ulong_t first_read_date; 3606 short probed_format; 3607 short track; 3608 short maxblock; 3609 short maxtrack; 3610 compat_int_t generation; 3611 compat_int_t keep_data; 3612 compat_int_t fd_ref; 3613 compat_int_t fd_device; 3614 compat_int_t last_checked; 3615 compat_caddr_t dmabuf; 3616 compat_int_t bufblocks; 3617 }; 3618 3619 struct compat_floppy_fdc_state { 3620 compat_int_t spec1; 3621 compat_int_t spec2; 3622 compat_int_t dtr; 3623 unsigned char version; 3624 unsigned char dor; 3625 compat_ulong_t address; 3626 unsigned int rawcmd:2; 3627 unsigned int reset:1; 3628 unsigned int need_configure:1; 3629 unsigned int perp_mode:2; 3630 unsigned int has_fifo:1; 3631 unsigned int driver_version; 3632 unsigned char track[4]; 3633 }; 3634 3635 struct compat_floppy_write_errors { 3636 unsigned int write_errors; 3637 compat_ulong_t first_error_sector; 3638 compat_int_t first_error_generation; 3639 compat_ulong_t last_error_sector; 3640 compat_int_t last_error_generation; 3641 compat_uint_t badness; 3642 }; 3643 3644 #define FDSETPRM32 _IOW(2, 0x42, struct compat_floppy_struct) 3645 #define FDDEFPRM32 _IOW(2, 0x43, struct compat_floppy_struct) 3646 #define FDSETDRVPRM32 _IOW(2, 0x90, struct compat_floppy_drive_params) 3647 #define FDGETDRVPRM32 _IOR(2, 0x11, struct compat_floppy_drive_params) 3648 #define FDGETDRVSTAT32 _IOR(2, 0x12, struct compat_floppy_drive_struct) 3649 #define FDPOLLDRVSTAT32 _IOR(2, 0x13, struct compat_floppy_drive_struct) 3650 #define FDGETFDCSTAT32 _IOR(2, 0x15, struct compat_floppy_fdc_state) 3651 #define FDWERRORGET32 _IOR(2, 0x17, struct compat_floppy_write_errors) 3652 3653 static int compat_set_geometry(struct block_device *bdev, fmode_t mode, unsigned int cmd, 3654 struct compat_floppy_struct __user *arg) 3655 { 3656 struct floppy_struct v; 3657 int drive, type; 3658 int err; 3659 3660 BUILD_BUG_ON(offsetof(struct floppy_struct, name) != 3661 offsetof(struct compat_floppy_struct, name)); 3662 3663 if (!(mode & (FMODE_WRITE | FMODE_WRITE_IOCTL))) 3664 return -EPERM; 3665 3666 memset(&v, 0, sizeof(struct floppy_struct)); 3667 if (copy_from_user(&v, arg, offsetof(struct floppy_struct, name))) 3668 return -EFAULT; 3669 3670 mutex_lock(&floppy_mutex); 3671 drive = (long)bdev->bd_disk->private_data; 3672 type = ITYPE(UDRS->fd_device); 3673 err = set_geometry(cmd == FDSETPRM32 ? FDSETPRM : FDDEFPRM, 3674 &v, drive, type, bdev); 3675 mutex_unlock(&floppy_mutex); 3676 return err; 3677 } 3678 3679 static int compat_get_prm(int drive, 3680 struct compat_floppy_struct __user *arg) 3681 { 3682 struct compat_floppy_struct v; 3683 struct floppy_struct *p; 3684 int err; 3685 3686 memset(&v, 0, sizeof(v)); 3687 mutex_lock(&floppy_mutex); 3688 err = get_floppy_geometry(drive, ITYPE(UDRS->fd_device), &p); 3689 if (err) { 3690 mutex_unlock(&floppy_mutex); 3691 return err; 3692 } 3693 memcpy(&v, p, offsetof(struct floppy_struct, name)); 3694 mutex_unlock(&floppy_mutex); 3695 if (copy_to_user(arg, &v, sizeof(struct compat_floppy_struct))) 3696 return -EFAULT; 3697 return 0; 3698 } 3699 3700 static int compat_setdrvprm(int drive, 3701 struct compat_floppy_drive_params __user *arg) 3702 { 3703 struct compat_floppy_drive_params v; 3704 3705 if (!capable(CAP_SYS_ADMIN)) 3706 return -EPERM; 3707 if (copy_from_user(&v, arg, sizeof(struct compat_floppy_drive_params))) 3708 return -EFAULT; 3709 mutex_lock(&floppy_mutex); 3710 UDP->cmos = v.cmos; 3711 UDP->max_dtr = v.max_dtr; 3712 UDP->hlt = v.hlt; 3713 UDP->hut = v.hut; 3714 UDP->srt = v.srt; 3715 UDP->spinup = v.spinup; 3716 UDP->spindown = v.spindown; 3717 UDP->spindown_offset = v.spindown_offset; 3718 UDP->select_delay = v.select_delay; 3719 UDP->rps = v.rps; 3720 UDP->tracks = v.tracks; 3721 UDP->timeout = v.timeout; 3722 UDP->interleave_sect = v.interleave_sect; 3723 UDP->max_errors = v.max_errors; 3724 UDP->flags = v.flags; 3725 UDP->read_track = v.read_track; 3726 memcpy(UDP->autodetect, v.autodetect, sizeof(v.autodetect)); 3727 UDP->checkfreq = v.checkfreq; 3728 UDP->native_format = v.native_format; 3729 mutex_unlock(&floppy_mutex); 3730 return 0; 3731 } 3732 3733 static int compat_getdrvprm(int drive, 3734 struct compat_floppy_drive_params __user *arg) 3735 { 3736 struct compat_floppy_drive_params v; 3737 3738 memset(&v, 0, sizeof(struct compat_floppy_drive_params)); 3739 mutex_lock(&floppy_mutex); 3740 v.cmos = UDP->cmos; 3741 v.max_dtr = UDP->max_dtr; 3742 v.hlt = UDP->hlt; 3743 v.hut = UDP->hut; 3744 v.srt = UDP->srt; 3745 v.spinup = UDP->spinup; 3746 v.spindown = UDP->spindown; 3747 v.spindown_offset = UDP->spindown_offset; 3748 v.select_delay = UDP->select_delay; 3749 v.rps = UDP->rps; 3750 v.tracks = UDP->tracks; 3751 v.timeout = UDP->timeout; 3752 v.interleave_sect = UDP->interleave_sect; 3753 v.max_errors = UDP->max_errors; 3754 v.flags = UDP->flags; 3755 v.read_track = UDP->read_track; 3756 memcpy(v.autodetect, UDP->autodetect, sizeof(v.autodetect)); 3757 v.checkfreq = UDP->checkfreq; 3758 v.native_format = UDP->native_format; 3759 mutex_unlock(&floppy_mutex); 3760 3761 if (copy_from_user(arg, &v, sizeof(struct compat_floppy_drive_params))) 3762 return -EFAULT; 3763 return 0; 3764 } 3765 3766 static int compat_getdrvstat(int drive, bool poll, 3767 struct compat_floppy_drive_struct __user *arg) 3768 { 3769 struct compat_floppy_drive_struct v; 3770 3771 memset(&v, 0, sizeof(struct compat_floppy_drive_struct)); 3772 mutex_lock(&floppy_mutex); 3773 3774 if (poll) { 3775 if (lock_fdc(drive)) 3776 goto Eintr; 3777 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR) 3778 goto Eintr; 3779 process_fd_request(); 3780 } 3781 v.spinup_date = UDRS->spinup_date; 3782 v.select_date = UDRS->select_date; 3783 v.first_read_date = UDRS->first_read_date; 3784 v.probed_format = UDRS->probed_format; 3785 v.track = UDRS->track; 3786 v.maxblock = UDRS->maxblock; 3787 v.maxtrack = UDRS->maxtrack; 3788 v.generation = UDRS->generation; 3789 v.keep_data = UDRS->keep_data; 3790 v.fd_ref = UDRS->fd_ref; 3791 v.fd_device = UDRS->fd_device; 3792 v.last_checked = UDRS->last_checked; 3793 v.dmabuf = (uintptr_t)UDRS->dmabuf; 3794 v.bufblocks = UDRS->bufblocks; 3795 mutex_unlock(&floppy_mutex); 3796 3797 if (copy_from_user(arg, &v, sizeof(struct compat_floppy_drive_struct))) 3798 return -EFAULT; 3799 return 0; 3800 Eintr: 3801 mutex_unlock(&floppy_mutex); 3802 return -EINTR; 3803 } 3804 3805 static int compat_getfdcstat(int drive, 3806 struct compat_floppy_fdc_state __user *arg) 3807 { 3808 struct compat_floppy_fdc_state v32; 3809 struct floppy_fdc_state v; 3810 3811 mutex_lock(&floppy_mutex); 3812 v = *UFDCS; 3813 mutex_unlock(&floppy_mutex); 3814 3815 memset(&v32, 0, sizeof(struct compat_floppy_fdc_state)); 3816 v32.spec1 = v.spec1; 3817 v32.spec2 = v.spec2; 3818 v32.dtr = v.dtr; 3819 v32.version = v.version; 3820 v32.dor = v.dor; 3821 v32.address = v.address; 3822 v32.rawcmd = v.rawcmd; 3823 v32.reset = v.reset; 3824 v32.need_configure = v.need_configure; 3825 v32.perp_mode = v.perp_mode; 3826 v32.has_fifo = v.has_fifo; 3827 v32.driver_version = v.driver_version; 3828 memcpy(v32.track, v.track, 4); 3829 if (copy_to_user(arg, &v32, sizeof(struct compat_floppy_fdc_state))) 3830 return -EFAULT; 3831 return 0; 3832 } 3833 3834 static int compat_werrorget(int drive, 3835 struct compat_floppy_write_errors __user *arg) 3836 { 3837 struct compat_floppy_write_errors v32; 3838 struct floppy_write_errors v; 3839 3840 memset(&v32, 0, sizeof(struct compat_floppy_write_errors)); 3841 mutex_lock(&floppy_mutex); 3842 v = *UDRWE; 3843 mutex_unlock(&floppy_mutex); 3844 v32.write_errors = v.write_errors; 3845 v32.first_error_sector = v.first_error_sector; 3846 v32.first_error_generation = v.first_error_generation; 3847 v32.last_error_sector = v.last_error_sector; 3848 v32.last_error_generation = v.last_error_generation; 3849 v32.badness = v.badness; 3850 if (copy_to_user(arg, &v32, sizeof(struct compat_floppy_write_errors))) 3851 return -EFAULT; 3852 return 0; 3853 } 3854 3855 static int fd_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, 3856 unsigned long param) 3857 { 3858 int drive = (long)bdev->bd_disk->private_data; 3859 switch (cmd) { 3860 case FDMSGON: 3861 case FDMSGOFF: 3862 case FDSETEMSGTRESH: 3863 case FDFLUSH: 3864 case FDWERRORCLR: 3865 case FDEJECT: 3866 case FDCLRPRM: 3867 case FDFMTBEG: 3868 case FDRESET: 3869 case FDTWADDLE: 3870 return fd_ioctl(bdev, mode, cmd, param); 3871 case FDSETMAXERRS: 3872 case FDGETMAXERRS: 3873 case FDGETDRVTYP: 3874 case FDFMTEND: 3875 case FDFMTTRK: 3876 case FDRAWCMD: 3877 return fd_ioctl(bdev, mode, cmd, 3878 (unsigned long)compat_ptr(param)); 3879 case FDSETPRM32: 3880 case FDDEFPRM32: 3881 return compat_set_geometry(bdev, mode, cmd, compat_ptr(param)); 3882 case FDGETPRM32: 3883 return compat_get_prm(drive, compat_ptr(param)); 3884 case FDSETDRVPRM32: 3885 return compat_setdrvprm(drive, compat_ptr(param)); 3886 case FDGETDRVPRM32: 3887 return compat_getdrvprm(drive, compat_ptr(param)); 3888 case FDPOLLDRVSTAT32: 3889 return compat_getdrvstat(drive, true, compat_ptr(param)); 3890 case FDGETDRVSTAT32: 3891 return compat_getdrvstat(drive, false, compat_ptr(param)); 3892 case FDGETFDCSTAT32: 3893 return compat_getfdcstat(drive, compat_ptr(param)); 3894 case FDWERRORGET32: 3895 return compat_werrorget(drive, compat_ptr(param)); 3896 } 3897 return -EINVAL; 3898 } 3899 #endif 3900 3901 static void __init config_types(void) 3902 { 3903 bool has_drive = false; 3904 int drive; 3905 3906 /* read drive info out of physical CMOS */ 3907 drive = 0; 3908 if (!UDP->cmos) 3909 UDP->cmos = FLOPPY0_TYPE; 3910 drive = 1; 3911 if (!UDP->cmos && FLOPPY1_TYPE) 3912 UDP->cmos = FLOPPY1_TYPE; 3913 3914 /* FIXME: additional physical CMOS drive detection should go here */ 3915 3916 for (drive = 0; drive < N_DRIVE; drive++) { 3917 unsigned int type = UDP->cmos; 3918 struct floppy_drive_params *params; 3919 const char *name = NULL; 3920 char temparea[32]; 3921 3922 if (type < ARRAY_SIZE(default_drive_params)) { 3923 params = &default_drive_params[type].params; 3924 if (type) { 3925 name = default_drive_params[type].name; 3926 allowed_drive_mask |= 1 << drive; 3927 } else 3928 allowed_drive_mask &= ~(1 << drive); 3929 } else { 3930 params = &default_drive_params[0].params; 3931 snprintf(temparea, sizeof(temparea), 3932 "unknown type %d (usb?)", type); 3933 name = temparea; 3934 } 3935 if (name) { 3936 const char *prepend; 3937 if (!has_drive) { 3938 prepend = ""; 3939 has_drive = true; 3940 pr_info("Floppy drive(s):"); 3941 } else { 3942 prepend = ","; 3943 } 3944 3945 pr_cont("%s fd%d is %s", prepend, drive, name); 3946 } 3947 *UDP = *params; 3948 } 3949 3950 if (has_drive) 3951 pr_cont("\n"); 3952 } 3953 3954 static void floppy_release(struct gendisk *disk, fmode_t mode) 3955 { 3956 int drive = (long)disk->private_data; 3957 3958 mutex_lock(&floppy_mutex); 3959 mutex_lock(&open_lock); 3960 if (!UDRS->fd_ref--) { 3961 DPRINT("floppy_release with fd_ref == 0"); 3962 UDRS->fd_ref = 0; 3963 } 3964 if (!UDRS->fd_ref) 3965 opened_bdev[drive] = NULL; 3966 mutex_unlock(&open_lock); 3967 mutex_unlock(&floppy_mutex); 3968 } 3969 3970 /* 3971 * floppy_open check for aliasing (/dev/fd0 can be the same as 3972 * /dev/PS0 etc), and disallows simultaneous access to the same 3973 * drive with different device numbers. 3974 */ 3975 static int floppy_open(struct block_device *bdev, fmode_t mode) 3976 { 3977 int drive = (long)bdev->bd_disk->private_data; 3978 int old_dev, new_dev; 3979 int try; 3980 int res = -EBUSY; 3981 char *tmp; 3982 3983 mutex_lock(&floppy_mutex); 3984 mutex_lock(&open_lock); 3985 old_dev = UDRS->fd_device; 3986 if (opened_bdev[drive] && opened_bdev[drive] != bdev) 3987 goto out2; 3988 3989 if (!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)) { 3990 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags); 3991 set_bit(FD_VERIFY_BIT, &UDRS->flags); 3992 } 3993 3994 UDRS->fd_ref++; 3995 3996 opened_bdev[drive] = bdev; 3997 3998 res = -ENXIO; 3999 4000 if (!floppy_track_buffer) { 4001 /* if opening an ED drive, reserve a big buffer, 4002 * else reserve a small one */ 4003 if ((UDP->cmos == 6) || (UDP->cmos == 5)) 4004 try = 64; /* Only 48 actually useful */ 4005 else 4006 try = 32; /* Only 24 actually useful */ 4007 4008 tmp = (char *)fd_dma_mem_alloc(1024 * try); 4009 if (!tmp && !floppy_track_buffer) { 4010 try >>= 1; /* buffer only one side */ 4011 INFBOUND(try, 16); 4012 tmp = (char *)fd_dma_mem_alloc(1024 * try); 4013 } 4014 if (!tmp && !floppy_track_buffer) 4015 fallback_on_nodma_alloc(&tmp, 2048 * try); 4016 if (!tmp && !floppy_track_buffer) { 4017 DPRINT("Unable to allocate DMA memory\n"); 4018 goto out; 4019 } 4020 if (floppy_track_buffer) { 4021 if (tmp) 4022 fd_dma_mem_free((unsigned long)tmp, try * 1024); 4023 } else { 4024 buffer_min = buffer_max = -1; 4025 floppy_track_buffer = tmp; 4026 max_buffer_sectors = try; 4027 } 4028 } 4029 4030 new_dev = MINOR(bdev->bd_dev); 4031 UDRS->fd_device = new_dev; 4032 set_capacity(disks[drive], floppy_sizes[new_dev]); 4033 if (old_dev != -1 && old_dev != new_dev) { 4034 if (buffer_drive == drive) 4035 buffer_track = -1; 4036 } 4037 4038 if (UFDCS->rawcmd == 1) 4039 UFDCS->rawcmd = 2; 4040 4041 if (!(mode & FMODE_NDELAY)) { 4042 if (mode & (FMODE_READ|FMODE_WRITE)) { 4043 UDRS->last_checked = 0; 4044 clear_bit(FD_OPEN_SHOULD_FAIL_BIT, &UDRS->flags); 4045 check_disk_change(bdev); 4046 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags)) 4047 goto out; 4048 if (test_bit(FD_OPEN_SHOULD_FAIL_BIT, &UDRS->flags)) 4049 goto out; 4050 } 4051 res = -EROFS; 4052 if ((mode & FMODE_WRITE) && 4053 !test_bit(FD_DISK_WRITABLE_BIT, &UDRS->flags)) 4054 goto out; 4055 } 4056 mutex_unlock(&open_lock); 4057 mutex_unlock(&floppy_mutex); 4058 return 0; 4059 out: 4060 UDRS->fd_ref--; 4061 4062 if (!UDRS->fd_ref) 4063 opened_bdev[drive] = NULL; 4064 out2: 4065 mutex_unlock(&open_lock); 4066 mutex_unlock(&floppy_mutex); 4067 return res; 4068 } 4069 4070 /* 4071 * Check if the disk has been changed or if a change has been faked. 4072 */ 4073 static unsigned int floppy_check_events(struct gendisk *disk, 4074 unsigned int clearing) 4075 { 4076 int drive = (long)disk->private_data; 4077 4078 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) || 4079 test_bit(FD_VERIFY_BIT, &UDRS->flags)) 4080 return DISK_EVENT_MEDIA_CHANGE; 4081 4082 if (time_after(jiffies, UDRS->last_checked + UDP->checkfreq)) { 4083 if (lock_fdc(drive)) 4084 return -EINTR; 4085 poll_drive(false, 0); 4086 process_fd_request(); 4087 } 4088 4089 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) || 4090 test_bit(FD_VERIFY_BIT, &UDRS->flags) || 4091 test_bit(drive, &fake_change) || 4092 drive_no_geom(drive)) 4093 return DISK_EVENT_MEDIA_CHANGE; 4094 return 0; 4095 } 4096 4097 /* 4098 * This implements "read block 0" for floppy_revalidate(). 4099 * Needed for format autodetection, checking whether there is 4100 * a disk in the drive, and whether that disk is writable. 4101 */ 4102 4103 struct rb0_cbdata { 4104 int drive; 4105 struct completion complete; 4106 }; 4107 4108 static void floppy_rb0_cb(struct bio *bio) 4109 { 4110 struct rb0_cbdata *cbdata = (struct rb0_cbdata *)bio->bi_private; 4111 int drive = cbdata->drive; 4112 4113 if (bio->bi_status) { 4114 pr_info("floppy: error %d while reading block 0\n", 4115 bio->bi_status); 4116 set_bit(FD_OPEN_SHOULD_FAIL_BIT, &UDRS->flags); 4117 } 4118 complete(&cbdata->complete); 4119 } 4120 4121 static int __floppy_read_block_0(struct block_device *bdev, int drive) 4122 { 4123 struct bio bio; 4124 struct bio_vec bio_vec; 4125 struct page *page; 4126 struct rb0_cbdata cbdata; 4127 size_t size; 4128 4129 page = alloc_page(GFP_NOIO); 4130 if (!page) { 4131 process_fd_request(); 4132 return -ENOMEM; 4133 } 4134 4135 size = bdev->bd_block_size; 4136 if (!size) 4137 size = 1024; 4138 4139 cbdata.drive = drive; 4140 4141 bio_init(&bio, &bio_vec, 1); 4142 bio_set_dev(&bio, bdev); 4143 bio_add_page(&bio, page, size, 0); 4144 4145 bio.bi_iter.bi_sector = 0; 4146 bio.bi_flags |= (1 << BIO_QUIET); 4147 bio.bi_private = &cbdata; 4148 bio.bi_end_io = floppy_rb0_cb; 4149 bio_set_op_attrs(&bio, REQ_OP_READ, 0); 4150 4151 submit_bio(&bio); 4152 process_fd_request(); 4153 4154 init_completion(&cbdata.complete); 4155 wait_for_completion(&cbdata.complete); 4156 4157 __free_page(page); 4158 4159 return 0; 4160 } 4161 4162 /* revalidate the floppy disk, i.e. trigger format autodetection by reading 4163 * the bootblock (block 0). "Autodetection" is also needed to check whether 4164 * there is a disk in the drive at all... Thus we also do it for fixed 4165 * geometry formats */ 4166 static int floppy_revalidate(struct gendisk *disk) 4167 { 4168 int drive = (long)disk->private_data; 4169 int cf; 4170 int res = 0; 4171 4172 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) || 4173 test_bit(FD_VERIFY_BIT, &UDRS->flags) || 4174 test_bit(drive, &fake_change) || 4175 drive_no_geom(drive)) { 4176 if (WARN(atomic_read(&usage_count) == 0, 4177 "VFS: revalidate called on non-open device.\n")) 4178 return -EFAULT; 4179 4180 res = lock_fdc(drive); 4181 if (res) 4182 return res; 4183 cf = (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) || 4184 test_bit(FD_VERIFY_BIT, &UDRS->flags)); 4185 if (!(cf || test_bit(drive, &fake_change) || drive_no_geom(drive))) { 4186 process_fd_request(); /*already done by another thread */ 4187 return 0; 4188 } 4189 UDRS->maxblock = 0; 4190 UDRS->maxtrack = 0; 4191 if (buffer_drive == drive) 4192 buffer_track = -1; 4193 clear_bit(drive, &fake_change); 4194 clear_bit(FD_DISK_CHANGED_BIT, &UDRS->flags); 4195 if (cf) 4196 UDRS->generation++; 4197 if (drive_no_geom(drive)) { 4198 /* auto-sensing */ 4199 res = __floppy_read_block_0(opened_bdev[drive], drive); 4200 } else { 4201 if (cf) 4202 poll_drive(false, FD_RAW_NEED_DISK); 4203 process_fd_request(); 4204 } 4205 } 4206 set_capacity(disk, floppy_sizes[UDRS->fd_device]); 4207 return res; 4208 } 4209 4210 static const struct block_device_operations floppy_fops = { 4211 .owner = THIS_MODULE, 4212 .open = floppy_open, 4213 .release = floppy_release, 4214 .ioctl = fd_ioctl, 4215 .getgeo = fd_getgeo, 4216 .check_events = floppy_check_events, 4217 .revalidate_disk = floppy_revalidate, 4218 #ifdef CONFIG_COMPAT 4219 .compat_ioctl = fd_compat_ioctl, 4220 #endif 4221 }; 4222 4223 /* 4224 * Floppy Driver initialization 4225 * ============================= 4226 */ 4227 4228 /* Determine the floppy disk controller type */ 4229 /* This routine was written by David C. Niemi */ 4230 static char __init get_fdc_version(void) 4231 { 4232 int r; 4233 4234 output_byte(FD_DUMPREGS); /* 82072 and better know DUMPREGS */ 4235 if (FDCS->reset) 4236 return FDC_NONE; 4237 r = result(); 4238 if (r <= 0x00) 4239 return FDC_NONE; /* No FDC present ??? */ 4240 if ((r == 1) && (reply_buffer[0] == 0x80)) { 4241 pr_info("FDC %d is an 8272A\n", fdc); 4242 return FDC_8272A; /* 8272a/765 don't know DUMPREGS */ 4243 } 4244 if (r != 10) { 4245 pr_info("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n", 4246 fdc, r); 4247 return FDC_UNKNOWN; 4248 } 4249 4250 if (!fdc_configure()) { 4251 pr_info("FDC %d is an 82072\n", fdc); 4252 return FDC_82072; /* 82072 doesn't know CONFIGURE */ 4253 } 4254 4255 output_byte(FD_PERPENDICULAR); 4256 if (need_more_output() == MORE_OUTPUT) { 4257 output_byte(0); 4258 } else { 4259 pr_info("FDC %d is an 82072A\n", fdc); 4260 return FDC_82072A; /* 82072A as found on Sparcs. */ 4261 } 4262 4263 output_byte(FD_UNLOCK); 4264 r = result(); 4265 if ((r == 1) && (reply_buffer[0] == 0x80)) { 4266 pr_info("FDC %d is a pre-1991 82077\n", fdc); 4267 return FDC_82077_ORIG; /* Pre-1991 82077, doesn't know 4268 * LOCK/UNLOCK */ 4269 } 4270 if ((r != 1) || (reply_buffer[0] != 0x00)) { 4271 pr_info("FDC %d init: UNLOCK: unexpected return of %d bytes.\n", 4272 fdc, r); 4273 return FDC_UNKNOWN; 4274 } 4275 output_byte(FD_PARTID); 4276 r = result(); 4277 if (r != 1) { 4278 pr_info("FDC %d init: PARTID: unexpected return of %d bytes.\n", 4279 fdc, r); 4280 return FDC_UNKNOWN; 4281 } 4282 if (reply_buffer[0] == 0x80) { 4283 pr_info("FDC %d is a post-1991 82077\n", fdc); 4284 return FDC_82077; /* Revised 82077AA passes all the tests */ 4285 } 4286 switch (reply_buffer[0] >> 5) { 4287 case 0x0: 4288 /* Either a 82078-1 or a 82078SL running at 5Volt */ 4289 pr_info("FDC %d is an 82078.\n", fdc); 4290 return FDC_82078; 4291 case 0x1: 4292 pr_info("FDC %d is a 44pin 82078\n", fdc); 4293 return FDC_82078; 4294 case 0x2: 4295 pr_info("FDC %d is a S82078B\n", fdc); 4296 return FDC_S82078B; 4297 case 0x3: 4298 pr_info("FDC %d is a National Semiconductor PC87306\n", fdc); 4299 return FDC_87306; 4300 default: 4301 pr_info("FDC %d init: 82078 variant with unknown PARTID=%d.\n", 4302 fdc, reply_buffer[0] >> 5); 4303 return FDC_82078_UNKN; 4304 } 4305 } /* get_fdc_version */ 4306 4307 /* lilo configuration */ 4308 4309 static void __init floppy_set_flags(int *ints, int param, int param2) 4310 { 4311 int i; 4312 4313 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) { 4314 if (param) 4315 default_drive_params[i].params.flags |= param2; 4316 else 4317 default_drive_params[i].params.flags &= ~param2; 4318 } 4319 DPRINT("%s flag 0x%x\n", param2 ? "Setting" : "Clearing", param); 4320 } 4321 4322 static void __init daring(int *ints, int param, int param2) 4323 { 4324 int i; 4325 4326 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) { 4327 if (param) { 4328 default_drive_params[i].params.select_delay = 0; 4329 default_drive_params[i].params.flags |= 4330 FD_SILENT_DCL_CLEAR; 4331 } else { 4332 default_drive_params[i].params.select_delay = 4333 2 * HZ / 100; 4334 default_drive_params[i].params.flags &= 4335 ~FD_SILENT_DCL_CLEAR; 4336 } 4337 } 4338 DPRINT("Assuming %s floppy hardware\n", param ? "standard" : "broken"); 4339 } 4340 4341 static void __init set_cmos(int *ints, int dummy, int dummy2) 4342 { 4343 int current_drive = 0; 4344 4345 if (ints[0] != 2) { 4346 DPRINT("wrong number of parameters for CMOS\n"); 4347 return; 4348 } 4349 current_drive = ints[1]; 4350 if (current_drive < 0 || current_drive >= 8) { 4351 DPRINT("bad drive for set_cmos\n"); 4352 return; 4353 } 4354 #if N_FDC > 1 4355 if (current_drive >= 4 && !FDC2) 4356 FDC2 = 0x370; 4357 #endif 4358 DP->cmos = ints[2]; 4359 DPRINT("setting CMOS code to %d\n", ints[2]); 4360 } 4361 4362 static struct param_table { 4363 const char *name; 4364 void (*fn) (int *ints, int param, int param2); 4365 int *var; 4366 int def_param; 4367 int param2; 4368 } config_params[] __initdata = { 4369 {"allowed_drive_mask", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */ 4370 {"all_drives", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */ 4371 {"asus_pci", NULL, &allowed_drive_mask, 0x33, 0}, 4372 {"irq", NULL, &FLOPPY_IRQ, 6, 0}, 4373 {"dma", NULL, &FLOPPY_DMA, 2, 0}, 4374 {"daring", daring, NULL, 1, 0}, 4375 #if N_FDC > 1 4376 {"two_fdc", NULL, &FDC2, 0x370, 0}, 4377 {"one_fdc", NULL, &FDC2, 0, 0}, 4378 #endif 4379 {"thinkpad", floppy_set_flags, NULL, 1, FD_INVERTED_DCL}, 4380 {"broken_dcl", floppy_set_flags, NULL, 1, FD_BROKEN_DCL}, 4381 {"messages", floppy_set_flags, NULL, 1, FTD_MSG}, 4382 {"silent_dcl_clear", floppy_set_flags, NULL, 1, FD_SILENT_DCL_CLEAR}, 4383 {"debug", floppy_set_flags, NULL, 1, FD_DEBUG}, 4384 {"nodma", NULL, &can_use_virtual_dma, 1, 0}, 4385 {"omnibook", NULL, &can_use_virtual_dma, 1, 0}, 4386 {"yesdma", NULL, &can_use_virtual_dma, 0, 0}, 4387 {"fifo_depth", NULL, &fifo_depth, 0xa, 0}, 4388 {"nofifo", NULL, &no_fifo, 0x20, 0}, 4389 {"usefifo", NULL, &no_fifo, 0, 0}, 4390 {"cmos", set_cmos, NULL, 0, 0}, 4391 {"slow", NULL, &slow_floppy, 1, 0}, 4392 {"unexpected_interrupts", NULL, &print_unex, 1, 0}, 4393 {"no_unexpected_interrupts", NULL, &print_unex, 0, 0}, 4394 {"L40SX", NULL, &print_unex, 0, 0} 4395 4396 EXTRA_FLOPPY_PARAMS 4397 }; 4398 4399 static int __init floppy_setup(char *str) 4400 { 4401 int i; 4402 int param; 4403 int ints[11]; 4404 4405 str = get_options(str, ARRAY_SIZE(ints), ints); 4406 if (str) { 4407 for (i = 0; i < ARRAY_SIZE(config_params); i++) { 4408 if (strcmp(str, config_params[i].name) == 0) { 4409 if (ints[0]) 4410 param = ints[1]; 4411 else 4412 param = config_params[i].def_param; 4413 if (config_params[i].fn) 4414 config_params[i].fn(ints, param, 4415 config_params[i]. 4416 param2); 4417 if (config_params[i].var) { 4418 DPRINT("%s=%d\n", str, param); 4419 *config_params[i].var = param; 4420 } 4421 return 1; 4422 } 4423 } 4424 } 4425 if (str) { 4426 DPRINT("unknown floppy option [%s]\n", str); 4427 4428 DPRINT("allowed options are:"); 4429 for (i = 0; i < ARRAY_SIZE(config_params); i++) 4430 pr_cont(" %s", config_params[i].name); 4431 pr_cont("\n"); 4432 } else 4433 DPRINT("botched floppy option\n"); 4434 DPRINT("Read Documentation/blockdev/floppy.txt\n"); 4435 return 0; 4436 } 4437 4438 static int have_no_fdc = -ENODEV; 4439 4440 static ssize_t floppy_cmos_show(struct device *dev, 4441 struct device_attribute *attr, char *buf) 4442 { 4443 struct platform_device *p = to_platform_device(dev); 4444 int drive; 4445 4446 drive = p->id; 4447 return sprintf(buf, "%X\n", UDP->cmos); 4448 } 4449 4450 static DEVICE_ATTR(cmos, 0444, floppy_cmos_show, NULL); 4451 4452 static struct attribute *floppy_dev_attrs[] = { 4453 &dev_attr_cmos.attr, 4454 NULL 4455 }; 4456 4457 ATTRIBUTE_GROUPS(floppy_dev); 4458 4459 static void floppy_device_release(struct device *dev) 4460 { 4461 } 4462 4463 static int floppy_resume(struct device *dev) 4464 { 4465 int fdc; 4466 4467 for (fdc = 0; fdc < N_FDC; fdc++) 4468 if (FDCS->address != -1) 4469 user_reset_fdc(-1, FD_RESET_ALWAYS, false); 4470 4471 return 0; 4472 } 4473 4474 static const struct dev_pm_ops floppy_pm_ops = { 4475 .resume = floppy_resume, 4476 .restore = floppy_resume, 4477 }; 4478 4479 static struct platform_driver floppy_driver = { 4480 .driver = { 4481 .name = "floppy", 4482 .pm = &floppy_pm_ops, 4483 }, 4484 }; 4485 4486 static struct platform_device floppy_device[N_DRIVE]; 4487 4488 static bool floppy_available(int drive) 4489 { 4490 if (!(allowed_drive_mask & (1 << drive))) 4491 return false; 4492 if (fdc_state[FDC(drive)].version == FDC_NONE) 4493 return false; 4494 return true; 4495 } 4496 4497 static struct kobject *floppy_find(dev_t dev, int *part, void *data) 4498 { 4499 int drive = (*part & 3) | ((*part & 0x80) >> 5); 4500 if (drive >= N_DRIVE || !floppy_available(drive)) 4501 return NULL; 4502 if (((*part >> 2) & 0x1f) >= ARRAY_SIZE(floppy_type)) 4503 return NULL; 4504 *part = 0; 4505 return get_disk_and_module(disks[drive]); 4506 } 4507 4508 static int __init do_floppy_init(void) 4509 { 4510 int i, unit, drive, err; 4511 4512 set_debugt(); 4513 interruptjiffies = resultjiffies = jiffies; 4514 4515 #if defined(CONFIG_PPC) 4516 if (check_legacy_ioport(FDC1)) 4517 return -ENODEV; 4518 #endif 4519 4520 raw_cmd = NULL; 4521 4522 floppy_wq = alloc_ordered_workqueue("floppy", 0); 4523 if (!floppy_wq) 4524 return -ENOMEM; 4525 4526 for (drive = 0; drive < N_DRIVE; drive++) { 4527 disks[drive] = alloc_disk(1); 4528 if (!disks[drive]) { 4529 err = -ENOMEM; 4530 goto out_put_disk; 4531 } 4532 4533 disks[drive]->queue = blk_init_queue(do_fd_request, &floppy_lock); 4534 if (!disks[drive]->queue) { 4535 err = -ENOMEM; 4536 goto out_put_disk; 4537 } 4538 4539 blk_queue_bounce_limit(disks[drive]->queue, BLK_BOUNCE_HIGH); 4540 blk_queue_max_hw_sectors(disks[drive]->queue, 64); 4541 disks[drive]->major = FLOPPY_MAJOR; 4542 disks[drive]->first_minor = TOMINOR(drive); 4543 disks[drive]->fops = &floppy_fops; 4544 sprintf(disks[drive]->disk_name, "fd%d", drive); 4545 4546 timer_setup(&motor_off_timer[drive], motor_off_callback, 0); 4547 } 4548 4549 err = register_blkdev(FLOPPY_MAJOR, "fd"); 4550 if (err) 4551 goto out_put_disk; 4552 4553 err = platform_driver_register(&floppy_driver); 4554 if (err) 4555 goto out_unreg_blkdev; 4556 4557 blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE, 4558 floppy_find, NULL, NULL); 4559 4560 for (i = 0; i < 256; i++) 4561 if (ITYPE(i)) 4562 floppy_sizes[i] = floppy_type[ITYPE(i)].size; 4563 else 4564 floppy_sizes[i] = MAX_DISK_SIZE << 1; 4565 4566 reschedule_timeout(MAXTIMEOUT, "floppy init"); 4567 config_types(); 4568 4569 for (i = 0; i < N_FDC; i++) { 4570 fdc = i; 4571 memset(FDCS, 0, sizeof(*FDCS)); 4572 FDCS->dtr = -1; 4573 FDCS->dor = 0x4; 4574 #if defined(__sparc__) || defined(__mc68000__) 4575 /*sparcs/sun3x don't have a DOR reset which we can fall back on to */ 4576 #ifdef __mc68000__ 4577 if (MACH_IS_SUN3X) 4578 #endif 4579 FDCS->version = FDC_82072A; 4580 #endif 4581 } 4582 4583 use_virtual_dma = can_use_virtual_dma & 1; 4584 fdc_state[0].address = FDC1; 4585 if (fdc_state[0].address == -1) { 4586 cancel_delayed_work(&fd_timeout); 4587 err = -ENODEV; 4588 goto out_unreg_region; 4589 } 4590 #if N_FDC > 1 4591 fdc_state[1].address = FDC2; 4592 #endif 4593 4594 fdc = 0; /* reset fdc in case of unexpected interrupt */ 4595 err = floppy_grab_irq_and_dma(); 4596 if (err) { 4597 cancel_delayed_work(&fd_timeout); 4598 err = -EBUSY; 4599 goto out_unreg_region; 4600 } 4601 4602 /* initialise drive state */ 4603 for (drive = 0; drive < N_DRIVE; drive++) { 4604 memset(UDRS, 0, sizeof(*UDRS)); 4605 memset(UDRWE, 0, sizeof(*UDRWE)); 4606 set_bit(FD_DISK_NEWCHANGE_BIT, &UDRS->flags); 4607 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags); 4608 set_bit(FD_VERIFY_BIT, &UDRS->flags); 4609 UDRS->fd_device = -1; 4610 floppy_track_buffer = NULL; 4611 max_buffer_sectors = 0; 4612 } 4613 /* 4614 * Small 10 msec delay to let through any interrupt that 4615 * initialization might have triggered, to not 4616 * confuse detection: 4617 */ 4618 msleep(10); 4619 4620 for (i = 0; i < N_FDC; i++) { 4621 fdc = i; 4622 FDCS->driver_version = FD_DRIVER_VERSION; 4623 for (unit = 0; unit < 4; unit++) 4624 FDCS->track[unit] = 0; 4625 if (FDCS->address == -1) 4626 continue; 4627 FDCS->rawcmd = 2; 4628 if (user_reset_fdc(-1, FD_RESET_ALWAYS, false)) { 4629 /* free ioports reserved by floppy_grab_irq_and_dma() */ 4630 floppy_release_regions(fdc); 4631 FDCS->address = -1; 4632 FDCS->version = FDC_NONE; 4633 continue; 4634 } 4635 /* Try to determine the floppy controller type */ 4636 FDCS->version = get_fdc_version(); 4637 if (FDCS->version == FDC_NONE) { 4638 /* free ioports reserved by floppy_grab_irq_and_dma() */ 4639 floppy_release_regions(fdc); 4640 FDCS->address = -1; 4641 continue; 4642 } 4643 if (can_use_virtual_dma == 2 && FDCS->version < FDC_82072A) 4644 can_use_virtual_dma = 0; 4645 4646 have_no_fdc = 0; 4647 /* Not all FDCs seem to be able to handle the version command 4648 * properly, so force a reset for the standard FDC clones, 4649 * to avoid interrupt garbage. 4650 */ 4651 user_reset_fdc(-1, FD_RESET_ALWAYS, false); 4652 } 4653 fdc = 0; 4654 cancel_delayed_work(&fd_timeout); 4655 current_drive = 0; 4656 initialized = true; 4657 if (have_no_fdc) { 4658 DPRINT("no floppy controllers found\n"); 4659 err = have_no_fdc; 4660 goto out_release_dma; 4661 } 4662 4663 for (drive = 0; drive < N_DRIVE; drive++) { 4664 if (!floppy_available(drive)) 4665 continue; 4666 4667 floppy_device[drive].name = floppy_device_name; 4668 floppy_device[drive].id = drive; 4669 floppy_device[drive].dev.release = floppy_device_release; 4670 floppy_device[drive].dev.groups = floppy_dev_groups; 4671 4672 err = platform_device_register(&floppy_device[drive]); 4673 if (err) 4674 goto out_remove_drives; 4675 4676 /* to be cleaned up... */ 4677 disks[drive]->private_data = (void *)(long)drive; 4678 disks[drive]->flags |= GENHD_FL_REMOVABLE; 4679 device_add_disk(&floppy_device[drive].dev, disks[drive]); 4680 } 4681 4682 return 0; 4683 4684 out_remove_drives: 4685 while (drive--) { 4686 if (floppy_available(drive)) { 4687 del_gendisk(disks[drive]); 4688 platform_device_unregister(&floppy_device[drive]); 4689 } 4690 } 4691 out_release_dma: 4692 if (atomic_read(&usage_count)) 4693 floppy_release_irq_and_dma(); 4694 out_unreg_region: 4695 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256); 4696 platform_driver_unregister(&floppy_driver); 4697 out_unreg_blkdev: 4698 unregister_blkdev(FLOPPY_MAJOR, "fd"); 4699 out_put_disk: 4700 destroy_workqueue(floppy_wq); 4701 for (drive = 0; drive < N_DRIVE; drive++) { 4702 if (!disks[drive]) 4703 break; 4704 if (disks[drive]->queue) { 4705 del_timer_sync(&motor_off_timer[drive]); 4706 blk_cleanup_queue(disks[drive]->queue); 4707 disks[drive]->queue = NULL; 4708 } 4709 put_disk(disks[drive]); 4710 } 4711 return err; 4712 } 4713 4714 #ifndef MODULE 4715 static __init void floppy_async_init(void *data, async_cookie_t cookie) 4716 { 4717 do_floppy_init(); 4718 } 4719 #endif 4720 4721 static int __init floppy_init(void) 4722 { 4723 #ifdef MODULE 4724 return do_floppy_init(); 4725 #else 4726 /* Don't hold up the bootup by the floppy initialization */ 4727 async_schedule(floppy_async_init, NULL); 4728 return 0; 4729 #endif 4730 } 4731 4732 static const struct io_region { 4733 int offset; 4734 int size; 4735 } io_regions[] = { 4736 { 2, 1 }, 4737 /* address + 3 is sometimes reserved by pnp bios for motherboard */ 4738 { 4, 2 }, 4739 /* address + 6 is reserved, and may be taken by IDE. 4740 * Unfortunately, Adaptec doesn't know this :-(, */ 4741 { 7, 1 }, 4742 }; 4743 4744 static void floppy_release_allocated_regions(int fdc, const struct io_region *p) 4745 { 4746 while (p != io_regions) { 4747 p--; 4748 release_region(FDCS->address + p->offset, p->size); 4749 } 4750 } 4751 4752 #define ARRAY_END(X) (&((X)[ARRAY_SIZE(X)])) 4753 4754 static int floppy_request_regions(int fdc) 4755 { 4756 const struct io_region *p; 4757 4758 for (p = io_regions; p < ARRAY_END(io_regions); p++) { 4759 if (!request_region(FDCS->address + p->offset, 4760 p->size, "floppy")) { 4761 DPRINT("Floppy io-port 0x%04lx in use\n", 4762 FDCS->address + p->offset); 4763 floppy_release_allocated_regions(fdc, p); 4764 return -EBUSY; 4765 } 4766 } 4767 return 0; 4768 } 4769 4770 static void floppy_release_regions(int fdc) 4771 { 4772 floppy_release_allocated_regions(fdc, ARRAY_END(io_regions)); 4773 } 4774 4775 static int floppy_grab_irq_and_dma(void) 4776 { 4777 if (atomic_inc_return(&usage_count) > 1) 4778 return 0; 4779 4780 /* 4781 * We might have scheduled a free_irq(), wait it to 4782 * drain first: 4783 */ 4784 flush_workqueue(floppy_wq); 4785 4786 if (fd_request_irq()) { 4787 DPRINT("Unable to grab IRQ%d for the floppy driver\n", 4788 FLOPPY_IRQ); 4789 atomic_dec(&usage_count); 4790 return -1; 4791 } 4792 if (fd_request_dma()) { 4793 DPRINT("Unable to grab DMA%d for the floppy driver\n", 4794 FLOPPY_DMA); 4795 if (can_use_virtual_dma & 2) 4796 use_virtual_dma = can_use_virtual_dma = 1; 4797 if (!(can_use_virtual_dma & 1)) { 4798 fd_free_irq(); 4799 atomic_dec(&usage_count); 4800 return -1; 4801 } 4802 } 4803 4804 for (fdc = 0; fdc < N_FDC; fdc++) { 4805 if (FDCS->address != -1) { 4806 if (floppy_request_regions(fdc)) 4807 goto cleanup; 4808 } 4809 } 4810 for (fdc = 0; fdc < N_FDC; fdc++) { 4811 if (FDCS->address != -1) { 4812 reset_fdc_info(1); 4813 fd_outb(FDCS->dor, FD_DOR); 4814 } 4815 } 4816 fdc = 0; 4817 set_dor(0, ~0, 8); /* avoid immediate interrupt */ 4818 4819 for (fdc = 0; fdc < N_FDC; fdc++) 4820 if (FDCS->address != -1) 4821 fd_outb(FDCS->dor, FD_DOR); 4822 /* 4823 * The driver will try and free resources and relies on us 4824 * to know if they were allocated or not. 4825 */ 4826 fdc = 0; 4827 irqdma_allocated = 1; 4828 return 0; 4829 cleanup: 4830 fd_free_irq(); 4831 fd_free_dma(); 4832 while (--fdc >= 0) 4833 floppy_release_regions(fdc); 4834 atomic_dec(&usage_count); 4835 return -1; 4836 } 4837 4838 static void floppy_release_irq_and_dma(void) 4839 { 4840 int old_fdc; 4841 #ifndef __sparc__ 4842 int drive; 4843 #endif 4844 long tmpsize; 4845 unsigned long tmpaddr; 4846 4847 if (!atomic_dec_and_test(&usage_count)) 4848 return; 4849 4850 if (irqdma_allocated) { 4851 fd_disable_dma(); 4852 fd_free_dma(); 4853 fd_free_irq(); 4854 irqdma_allocated = 0; 4855 } 4856 set_dor(0, ~0, 8); 4857 #if N_FDC > 1 4858 set_dor(1, ~8, 0); 4859 #endif 4860 4861 if (floppy_track_buffer && max_buffer_sectors) { 4862 tmpsize = max_buffer_sectors * 1024; 4863 tmpaddr = (unsigned long)floppy_track_buffer; 4864 floppy_track_buffer = NULL; 4865 max_buffer_sectors = 0; 4866 buffer_min = buffer_max = -1; 4867 fd_dma_mem_free(tmpaddr, tmpsize); 4868 } 4869 #ifndef __sparc__ 4870 for (drive = 0; drive < N_FDC * 4; drive++) 4871 if (timer_pending(motor_off_timer + drive)) 4872 pr_info("motor off timer %d still active\n", drive); 4873 #endif 4874 4875 if (delayed_work_pending(&fd_timeout)) 4876 pr_info("floppy timer still active:%s\n", timeout_message); 4877 if (delayed_work_pending(&fd_timer)) 4878 pr_info("auxiliary floppy timer still active\n"); 4879 if (work_pending(&floppy_work)) 4880 pr_info("work still pending\n"); 4881 old_fdc = fdc; 4882 for (fdc = 0; fdc < N_FDC; fdc++) 4883 if (FDCS->address != -1) 4884 floppy_release_regions(fdc); 4885 fdc = old_fdc; 4886 } 4887 4888 #ifdef MODULE 4889 4890 static char *floppy; 4891 4892 static void __init parse_floppy_cfg_string(char *cfg) 4893 { 4894 char *ptr; 4895 4896 while (*cfg) { 4897 ptr = cfg; 4898 while (*cfg && *cfg != ' ' && *cfg != '\t') 4899 cfg++; 4900 if (*cfg) { 4901 *cfg = '\0'; 4902 cfg++; 4903 } 4904 if (*ptr) 4905 floppy_setup(ptr); 4906 } 4907 } 4908 4909 static int __init floppy_module_init(void) 4910 { 4911 if (floppy) 4912 parse_floppy_cfg_string(floppy); 4913 return floppy_init(); 4914 } 4915 module_init(floppy_module_init); 4916 4917 static void __exit floppy_module_exit(void) 4918 { 4919 int drive; 4920 4921 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256); 4922 unregister_blkdev(FLOPPY_MAJOR, "fd"); 4923 platform_driver_unregister(&floppy_driver); 4924 4925 destroy_workqueue(floppy_wq); 4926 4927 for (drive = 0; drive < N_DRIVE; drive++) { 4928 del_timer_sync(&motor_off_timer[drive]); 4929 4930 if (floppy_available(drive)) { 4931 del_gendisk(disks[drive]); 4932 platform_device_unregister(&floppy_device[drive]); 4933 } 4934 blk_cleanup_queue(disks[drive]->queue); 4935 4936 /* 4937 * These disks have not called add_disk(). Don't put down 4938 * queue reference in put_disk(). 4939 */ 4940 if (!(allowed_drive_mask & (1 << drive)) || 4941 fdc_state[FDC(drive)].version == FDC_NONE) 4942 disks[drive]->queue = NULL; 4943 4944 put_disk(disks[drive]); 4945 } 4946 4947 cancel_delayed_work_sync(&fd_timeout); 4948 cancel_delayed_work_sync(&fd_timer); 4949 4950 if (atomic_read(&usage_count)) 4951 floppy_release_irq_and_dma(); 4952 4953 /* eject disk, if any */ 4954 fd_eject(0); 4955 } 4956 4957 module_exit(floppy_module_exit); 4958 4959 module_param(floppy, charp, 0); 4960 module_param(FLOPPY_IRQ, int, 0); 4961 module_param(FLOPPY_DMA, int, 0); 4962 MODULE_AUTHOR("Alain L. Knaff"); 4963 MODULE_SUPPORTED_DEVICE("fd"); 4964 MODULE_LICENSE("GPL"); 4965 4966 /* This doesn't actually get used other than for module information */ 4967 static const struct pnp_device_id floppy_pnpids[] = { 4968 {"PNP0700", 0}, 4969 {} 4970 }; 4971 4972 MODULE_DEVICE_TABLE(pnp, floppy_pnpids); 4973 4974 #else 4975 4976 __setup("floppy=", floppy_setup); 4977 module_init(floppy_init) 4978 #endif 4979 4980 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR); 4981