1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/drivers/block/floppy.c 4 * 5 * Copyright (C) 1991, 1992 Linus Torvalds 6 * Copyright (C) 1993, 1994 Alain Knaff 7 * Copyright (C) 1998 Alan Cox 8 */ 9 10 /* 11 * 02.12.91 - Changed to static variables to indicate need for reset 12 * and recalibrate. This makes some things easier (output_byte reset 13 * checking etc), and means less interrupt jumping in case of errors, 14 * so the code is hopefully easier to understand. 15 */ 16 17 /* 18 * This file is certainly a mess. I've tried my best to get it working, 19 * but I don't like programming floppies, and I have only one anyway. 20 * Urgel. I should check for more errors, and do more graceful error 21 * recovery. Seems there are problems with several drives. I've tried to 22 * correct them. No promises. 23 */ 24 25 /* 26 * As with hd.c, all routines within this file can (and will) be called 27 * by interrupts, so extreme caution is needed. A hardware interrupt 28 * handler may not sleep, or a kernel panic will happen. Thus I cannot 29 * call "floppy-on" directly, but have to set a special timer interrupt 30 * etc. 31 */ 32 33 /* 34 * 28.02.92 - made track-buffering routines, based on the routines written 35 * by entropy@wintermute.wpi.edu (Lawrence Foard). Linus. 36 */ 37 38 /* 39 * Automatic floppy-detection and formatting written by Werner Almesberger 40 * (almesber@nessie.cs.id.ethz.ch), who also corrected some problems with 41 * the floppy-change signal detection. 42 */ 43 44 /* 45 * 1992/7/22 -- Hennus Bergman: Added better error reporting, fixed 46 * FDC data overrun bug, added some preliminary stuff for vertical 47 * recording support. 48 * 49 * 1992/9/17: Added DMA allocation & DMA functions. -- hhb. 50 * 51 * TODO: Errors are still not counted properly. 52 */ 53 54 /* 1992/9/20 55 * Modifications for ``Sector Shifting'' by Rob Hooft (hooft@chem.ruu.nl) 56 * modeled after the freeware MS-DOS program fdformat/88 V1.8 by 57 * Christoph H. Hochst\"atter. 58 * I have fixed the shift values to the ones I always use. Maybe a new 59 * ioctl() should be created to be able to modify them. 60 * There is a bug in the driver that makes it impossible to format a 61 * floppy as the first thing after bootup. 62 */ 63 64 /* 65 * 1993/4/29 -- Linus -- cleaned up the timer handling in the kernel, and 66 * this helped the floppy driver as well. Much cleaner, and still seems to 67 * work. 68 */ 69 70 /* 1994/6/24 --bbroad-- added the floppy table entries and made 71 * minor modifications to allow 2.88 floppies to be run. 72 */ 73 74 /* 1994/7/13 -- Paul Vojta -- modified the probing code to allow three or more 75 * disk types. 76 */ 77 78 /* 79 * 1994/8/8 -- Alain Knaff -- Switched to fdpatch driver: Support for bigger 80 * format bug fixes, but unfortunately some new bugs too... 81 */ 82 83 /* 1994/9/17 -- Koen Holtman -- added logging of physical floppy write 84 * errors to allow safe writing by specialized programs. 85 */ 86 87 /* 1995/4/24 -- Dan Fandrich -- added support for Commodore 1581 3.5" disks 88 * by defining bit 1 of the "stretch" parameter to mean put sectors on the 89 * opposite side of the disk, leaving the sector IDs alone (i.e. Commodore's 90 * drives are "upside-down"). 91 */ 92 93 /* 94 * 1995/8/26 -- Andreas Busse -- added Mips support. 95 */ 96 97 /* 98 * 1995/10/18 -- Ralf Baechle -- Portability cleanup; move machine dependent 99 * features to asm/floppy.h. 100 */ 101 102 /* 103 * 1998/1/21 -- Richard Gooch <rgooch@atnf.csiro.au> -- devfs support 104 */ 105 106 /* 107 * 1998/05/07 -- Russell King -- More portability cleanups; moved definition of 108 * interrupt and dma channel to asm/floppy.h. Cleaned up some formatting & 109 * use of '0' for NULL. 110 */ 111 112 /* 113 * 1998/06/07 -- Alan Cox -- Merged the 2.0.34 fixes for resource allocation 114 * failures. 115 */ 116 117 /* 118 * 1998/09/20 -- David Weinehall -- Added slow-down code for buggy PS/2-drives. 119 */ 120 121 /* 122 * 1999/08/13 -- Paul Slootman -- floppy stopped working on Alpha after 24 123 * days, 6 hours, 32 minutes and 32 seconds (i.e. MAXINT jiffies; ints were 124 * being used to store jiffies, which are unsigned longs). 125 */ 126 127 /* 128 * 2000/08/28 -- Arnaldo Carvalho de Melo <acme@conectiva.com.br> 129 * - get rid of check_region 130 * - s/suser/capable/ 131 */ 132 133 /* 134 * 2001/08/26 -- Paul Gortmaker - fix insmod oops on machines with no 135 * floppy controller (lingering task on list after module is gone... boom.) 136 */ 137 138 /* 139 * 2002/02/07 -- Anton Altaparmakov - Fix io ports reservation to correct range 140 * (0x3f2-0x3f5, 0x3f7). This fix is a bit of a hack but the proper fix 141 * requires many non-obvious changes in arch dependent code. 142 */ 143 144 /* 2003/07/28 -- Daniele Bellucci <bellucda@tiscali.it>. 145 * Better audit of register_blkdev. 146 */ 147 148 #define REALLY_SLOW_IO 149 150 #define DEBUGT 2 151 152 #define DPRINT(format, args...) \ 153 pr_info("floppy%d: " format, current_drive, ##args) 154 155 #define DCL_DEBUG /* debug disk change line */ 156 #ifdef DCL_DEBUG 157 #define debug_dcl(test, fmt, args...) \ 158 do { if ((test) & FD_DEBUG) DPRINT(fmt, ##args); } while (0) 159 #else 160 #define debug_dcl(test, fmt, args...) \ 161 do { if (0) DPRINT(fmt, ##args); } while (0) 162 #endif 163 164 /* do print messages for unexpected interrupts */ 165 static int print_unex = 1; 166 #include <linux/module.h> 167 #include <linux/sched.h> 168 #include <linux/fs.h> 169 #include <linux/kernel.h> 170 #include <linux/timer.h> 171 #include <linux/workqueue.h> 172 #include <linux/fdreg.h> 173 #include <linux/fd.h> 174 #include <linux/hdreg.h> 175 #include <linux/errno.h> 176 #include <linux/slab.h> 177 #include <linux/mm.h> 178 #include <linux/bio.h> 179 #include <linux/string.h> 180 #include <linux/jiffies.h> 181 #include <linux/fcntl.h> 182 #include <linux/delay.h> 183 #include <linux/mc146818rtc.h> /* CMOS defines */ 184 #include <linux/ioport.h> 185 #include <linux/interrupt.h> 186 #include <linux/init.h> 187 #include <linux/major.h> 188 #include <linux/platform_device.h> 189 #include <linux/mod_devicetable.h> 190 #include <linux/mutex.h> 191 #include <linux/io.h> 192 #include <linux/uaccess.h> 193 #include <linux/async.h> 194 #include <linux/compat.h> 195 196 /* 197 * PS/2 floppies have much slower step rates than regular floppies. 198 * It's been recommended that take about 1/4 of the default speed 199 * in some more extreme cases. 200 */ 201 static DEFINE_MUTEX(floppy_mutex); 202 static int slow_floppy; 203 204 #include <asm/dma.h> 205 #include <asm/irq.h> 206 207 static int FLOPPY_IRQ = 6; 208 static int FLOPPY_DMA = 2; 209 static int can_use_virtual_dma = 2; 210 /* ======= 211 * can use virtual DMA: 212 * 0 = use of virtual DMA disallowed by config 213 * 1 = use of virtual DMA prescribed by config 214 * 2 = no virtual DMA preference configured. By default try hard DMA, 215 * but fall back on virtual DMA when not enough memory available 216 */ 217 218 static int use_virtual_dma; 219 /* ======= 220 * use virtual DMA 221 * 0 using hard DMA 222 * 1 using virtual DMA 223 * This variable is set to virtual when a DMA mem problem arises, and 224 * reset back in floppy_grab_irq_and_dma. 225 * It is not safe to reset it in other circumstances, because the floppy 226 * driver may have several buffers in use at once, and we do currently not 227 * record each buffers capabilities 228 */ 229 230 static DEFINE_SPINLOCK(floppy_lock); 231 232 static unsigned short virtual_dma_port = 0x3f0; 233 irqreturn_t floppy_interrupt(int irq, void *dev_id); 234 static int set_dor(int fdc, char mask, char data); 235 236 #define K_64 0x10000 /* 64KB */ 237 238 /* the following is the mask of allowed drives. By default units 2 and 239 * 3 of both floppy controllers are disabled, because switching on the 240 * motor of these drives causes system hangs on some PCI computers. drive 241 * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if 242 * a drive is allowed. 243 * 244 * NOTE: This must come before we include the arch floppy header because 245 * some ports reference this variable from there. -DaveM 246 */ 247 248 static int allowed_drive_mask = 0x33; 249 250 #include <asm/floppy.h> 251 252 static int irqdma_allocated; 253 254 #include <linux/blk-mq.h> 255 #include <linux/blkpg.h> 256 #include <linux/cdrom.h> /* for the compatibility eject ioctl */ 257 #include <linux/completion.h> 258 259 static LIST_HEAD(floppy_reqs); 260 static struct request *current_req; 261 static int set_next_request(void); 262 263 #ifndef fd_get_dma_residue 264 #define fd_get_dma_residue() get_dma_residue(FLOPPY_DMA) 265 #endif 266 267 /* Dma Memory related stuff */ 268 269 #ifndef fd_dma_mem_free 270 #define fd_dma_mem_free(addr, size) free_pages(addr, get_order(size)) 271 #endif 272 273 #ifndef fd_dma_mem_alloc 274 #define fd_dma_mem_alloc(size) __get_dma_pages(GFP_KERNEL, get_order(size)) 275 #endif 276 277 #ifndef fd_cacheflush 278 #define fd_cacheflush(addr, size) /* nothing... */ 279 #endif 280 281 static inline void fallback_on_nodma_alloc(char **addr, size_t l) 282 { 283 #ifdef FLOPPY_CAN_FALLBACK_ON_NODMA 284 if (*addr) 285 return; /* we have the memory */ 286 if (can_use_virtual_dma != 2) 287 return; /* no fallback allowed */ 288 pr_info("DMA memory shortage. Temporarily falling back on virtual DMA\n"); 289 *addr = (char *)nodma_mem_alloc(l); 290 #else 291 return; 292 #endif 293 } 294 295 /* End dma memory related stuff */ 296 297 static unsigned long fake_change; 298 static bool initialized; 299 300 #define ITYPE(x) (((x) >> 2) & 0x1f) 301 #define TOMINOR(x) ((x & 3) | ((x & 4) << 5)) 302 #define UNIT(x) ((x) & 0x03) /* drive on fdc */ 303 #define FDC(x) (((x) & 0x04) >> 2) /* fdc of drive */ 304 /* reverse mapping from unit and fdc to drive */ 305 #define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2)) 306 307 #define PH_HEAD(floppy, head) (((((floppy)->stretch & 2) >> 1) ^ head) << 2) 308 #define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH) 309 310 /* read/write commands */ 311 #define COMMAND 0 312 #define DR_SELECT 1 313 #define TRACK 2 314 #define HEAD 3 315 #define SECTOR 4 316 #define SIZECODE 5 317 #define SECT_PER_TRACK 6 318 #define GAP 7 319 #define SIZECODE2 8 320 #define NR_RW 9 321 322 /* format commands */ 323 #define F_SIZECODE 2 324 #define F_SECT_PER_TRACK 3 325 #define F_GAP 4 326 #define F_FILL 5 327 #define NR_F 6 328 329 /* 330 * Maximum disk size (in kilobytes). 331 * This default is used whenever the current disk size is unknown. 332 * [Now it is rather a minimum] 333 */ 334 #define MAX_DISK_SIZE 4 /* 3984 */ 335 336 /* 337 * globals used by 'result()' 338 */ 339 static unsigned char reply_buffer[FD_RAW_REPLY_SIZE]; 340 static int inr; /* size of reply buffer, when called from interrupt */ 341 #define ST0 0 342 #define ST1 1 343 #define ST2 2 344 #define ST3 0 /* result of GETSTATUS */ 345 #define R_TRACK 3 346 #define R_HEAD 4 347 #define R_SECTOR 5 348 #define R_SIZECODE 6 349 350 #define SEL_DLY (2 * HZ / 100) 351 352 /* 353 * this struct defines the different floppy drive types. 354 */ 355 static struct { 356 struct floppy_drive_params params; 357 const char *name; /* name printed while booting */ 358 } default_drive_params[] = { 359 /* NOTE: the time values in jiffies should be in msec! 360 CMOS drive type 361 | Maximum data rate supported by drive type 362 | | Head load time, msec 363 | | | Head unload time, msec (not used) 364 | | | | Step rate interval, usec 365 | | | | | Time needed for spinup time (jiffies) 366 | | | | | | Timeout for spinning down (jiffies) 367 | | | | | | | Spindown offset (where disk stops) 368 | | | | | | | | Select delay 369 | | | | | | | | | RPS 370 | | | | | | | | | | Max number of tracks 371 | | | | | | | | | | | Interrupt timeout 372 | | | | | | | | | | | | Max nonintlv. sectors 373 | | | | | | | | | | | | | -Max Errors- flags */ 374 {{0, 500, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 80, 3*HZ, 20, {3,1,2,0,2}, 0, 375 0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" }, 376 377 {{1, 300, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 40, 3*HZ, 17, {3,1,2,0,2}, 0, 378 0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/ 379 380 {{2, 500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6, 83, 3*HZ, 17, {3,1,2,0,2}, 0, 381 0, { 2, 5, 6,23,10,20,12, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/ 382 383 {{3, 250, 16, 16, 3000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0, 384 0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/ 385 386 {{4, 500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0, 387 0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/ 388 389 {{5, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0, 390 0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/ 391 392 {{6, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0, 393 0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/ 394 /* | --autodetected formats--- | | | 395 * read_track | | Name printed when booting 396 * | Native format 397 * Frequency of disk change checks */ 398 }; 399 400 static struct floppy_drive_params drive_params[N_DRIVE]; 401 static struct floppy_drive_struct drive_state[N_DRIVE]; 402 static struct floppy_write_errors write_errors[N_DRIVE]; 403 static struct timer_list motor_off_timer[N_DRIVE]; 404 static struct blk_mq_tag_set tag_sets[N_DRIVE]; 405 static struct block_device *opened_bdev[N_DRIVE]; 406 static DEFINE_MUTEX(open_lock); 407 static struct floppy_raw_cmd *raw_cmd, default_raw_cmd; 408 409 /* 410 * This struct defines the different floppy types. 411 * 412 * Bit 0 of 'stretch' tells if the tracks need to be doubled for some 413 * types (e.g. 360kB diskette in 1.2MB drive, etc.). Bit 1 of 'stretch' 414 * tells if the disk is in Commodore 1581 format, which means side 0 sectors 415 * are located on side 1 of the disk but with a side 0 ID, and vice-versa. 416 * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the 417 * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical 418 * side 0 is on physical side 0 (but with the misnamed sector IDs). 419 * 'stretch' should probably be renamed to something more general, like 420 * 'options'. 421 * 422 * Bits 2 through 9 of 'stretch' tell the number of the first sector. 423 * The LSB (bit 2) is flipped. For most disks, the first sector 424 * is 1 (represented by 0x00<<2). For some CP/M and music sampler 425 * disks (such as Ensoniq EPS 16plus) it is 0 (represented as 0x01<<2). 426 * For Amstrad CPC disks it is 0xC1 (represented as 0xC0<<2). 427 * 428 * Other parameters should be self-explanatory (see also setfdprm(8)). 429 */ 430 /* 431 Size 432 | Sectors per track 433 | | Head 434 | | | Tracks 435 | | | | Stretch 436 | | | | | Gap 1 size 437 | | | | | | Data rate, | 0x40 for perp 438 | | | | | | | Spec1 (stepping rate, head unload 439 | | | | | | | | /fmt gap (gap2) */ 440 static struct floppy_struct floppy_type[32] = { 441 { 0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL }, /* 0 no testing */ 442 { 720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360" }, /* 1 360KB PC */ 443 { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /* 2 1.2MB AT */ 444 { 720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360" }, /* 3 360KB SS 3.5" */ 445 { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720" }, /* 4 720KB 3.5" */ 446 { 720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360" }, /* 5 360KB AT */ 447 { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720" }, /* 6 720KB AT */ 448 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /* 7 1.44MB 3.5" */ 449 { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /* 8 2.88MB 3.5" */ 450 { 6240,39,2,80,0,0x1B,0x43,0xAF,0x28,"E3120" }, /* 9 3.12MB 3.5" */ 451 452 { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25" */ 453 { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5" */ 454 { 820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410" }, /* 12 410KB 5.25" */ 455 { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820" }, /* 13 820KB 3.5" */ 456 { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25" */ 457 { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5" */ 458 { 840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420" }, /* 16 420KB 5.25" */ 459 { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830" }, /* 17 830KB 3.5" */ 460 { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25" */ 461 { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5" */ 462 463 { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880" }, /* 20 880KB 5.25" */ 464 { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5" */ 465 { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5" */ 466 { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25" */ 467 { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5" */ 468 { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5" */ 469 { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5" */ 470 { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5" */ 471 { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5" */ 472 { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5" */ 473 474 { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800" }, /* 30 800KB 3.5" */ 475 { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5" */ 476 }; 477 478 static struct gendisk *disks[N_DRIVE][ARRAY_SIZE(floppy_type)]; 479 480 #define SECTSIZE (_FD_SECTSIZE(*floppy)) 481 482 /* Auto-detection: Disk type used until the next media change occurs. */ 483 static struct floppy_struct *current_type[N_DRIVE]; 484 485 /* 486 * User-provided type information. current_type points to 487 * the respective entry of this array. 488 */ 489 static struct floppy_struct user_params[N_DRIVE]; 490 491 static sector_t floppy_sizes[256]; 492 493 static char floppy_device_name[] = "floppy"; 494 495 /* 496 * The driver is trying to determine the correct media format 497 * while probing is set. rw_interrupt() clears it after a 498 * successful access. 499 */ 500 static int probing; 501 502 /* Synchronization of FDC access. */ 503 #define FD_COMMAND_NONE -1 504 #define FD_COMMAND_ERROR 2 505 #define FD_COMMAND_OKAY 3 506 507 static volatile int command_status = FD_COMMAND_NONE; 508 static unsigned long fdc_busy; 509 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait); 510 static DECLARE_WAIT_QUEUE_HEAD(command_done); 511 512 /* Errors during formatting are counted here. */ 513 static int format_errors; 514 515 /* Format request descriptor. */ 516 static struct format_descr format_req; 517 518 /* 519 * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps 520 * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc), 521 * H is head unload time (1=16ms, 2=32ms, etc) 522 */ 523 524 /* 525 * Track buffer 526 * Because these are written to by the DMA controller, they must 527 * not contain a 64k byte boundary crossing, or data will be 528 * corrupted/lost. 529 */ 530 static char *floppy_track_buffer; 531 static int max_buffer_sectors; 532 533 static int *errors; 534 typedef void (*done_f)(int); 535 static const struct cont_t { 536 void (*interrupt)(void); 537 /* this is called after the interrupt of the 538 * main command */ 539 void (*redo)(void); /* this is called to retry the operation */ 540 void (*error)(void); /* this is called to tally an error */ 541 done_f done; /* this is called to say if the operation has 542 * succeeded/failed */ 543 } *cont; 544 545 static void floppy_ready(void); 546 static void floppy_start(void); 547 static void process_fd_request(void); 548 static void recalibrate_floppy(void); 549 static void floppy_shutdown(struct work_struct *); 550 551 static int floppy_request_regions(int); 552 static void floppy_release_regions(int); 553 static int floppy_grab_irq_and_dma(void); 554 static void floppy_release_irq_and_dma(void); 555 556 /* 557 * The "reset" variable should be tested whenever an interrupt is scheduled, 558 * after the commands have been sent. This is to ensure that the driver doesn't 559 * get wedged when the interrupt doesn't come because of a failed command. 560 * reset doesn't need to be tested before sending commands, because 561 * output_byte is automatically disabled when reset is set. 562 */ 563 static void reset_fdc(void); 564 static int floppy_revalidate(struct gendisk *disk); 565 566 /* 567 * These are global variables, as that's the easiest way to give 568 * information to interrupts. They are the data used for the current 569 * request. 570 */ 571 #define NO_TRACK -1 572 #define NEED_1_RECAL -2 573 #define NEED_2_RECAL -3 574 575 static atomic_t usage_count = ATOMIC_INIT(0); 576 577 /* buffer related variables */ 578 static int buffer_track = -1; 579 static int buffer_drive = -1; 580 static int buffer_min = -1; 581 static int buffer_max = -1; 582 583 /* fdc related variables, should end up in a struct */ 584 static struct floppy_fdc_state fdc_state[N_FDC]; 585 static int current_fdc; /* current fdc */ 586 587 static struct workqueue_struct *floppy_wq; 588 589 static struct floppy_struct *_floppy = floppy_type; 590 static unsigned char current_drive; 591 static long current_count_sectors; 592 static unsigned char fsector_t; /* sector in track */ 593 static unsigned char in_sector_offset; /* offset within physical sector, 594 * expressed in units of 512 bytes */ 595 596 static inline unsigned char fdc_inb(int fdc, int reg) 597 { 598 return fd_inb(fdc_state[fdc].address, reg); 599 } 600 601 static inline void fdc_outb(unsigned char value, int fdc, int reg) 602 { 603 fd_outb(value, fdc_state[fdc].address, reg); 604 } 605 606 static inline bool drive_no_geom(int drive) 607 { 608 return !current_type[drive] && !ITYPE(drive_state[drive].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 (drive_params[current_drive].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 MAXTIMEOUT -2 672 673 static void __reschedule_timeout(int drive, const char *message) 674 { 675 unsigned long delay; 676 677 if (drive < 0 || drive >= N_DRIVE) { 678 delay = 20UL * HZ; 679 drive = 0; 680 } else 681 delay = drive_params[drive].timeout; 682 683 mod_delayed_work(floppy_wq, &fd_timeout, delay); 684 if (drive_params[drive].flags & FD_DEBUG) 685 DPRINT("reschedule timeout %s\n", message); 686 timeout_message = message; 687 } 688 689 static void reschedule_timeout(int drive, const char *message) 690 { 691 unsigned long flags; 692 693 spin_lock_irqsave(&floppy_lock, flags); 694 __reschedule_timeout(drive, message); 695 spin_unlock_irqrestore(&floppy_lock, flags); 696 } 697 698 #define INFBOUND(a, b) (a) = max_t(int, a, b) 699 #define SUPBOUND(a, b) (a) = min_t(int, a, b) 700 701 /* 702 * Bottom half floppy driver. 703 * ========================== 704 * 705 * This part of the file contains the code talking directly to the hardware, 706 * and also the main service loop (seek-configure-spinup-command) 707 */ 708 709 /* 710 * disk change. 711 * This routine is responsible for maintaining the FD_DISK_CHANGE flag, 712 * and the last_checked date. 713 * 714 * last_checked is the date of the last check which showed 'no disk change' 715 * FD_DISK_CHANGE is set under two conditions: 716 * 1. The floppy has been changed after some i/o to that floppy already 717 * took place. 718 * 2. No floppy disk is in the drive. This is done in order to ensure that 719 * requests are quickly flushed in case there is no disk in the drive. It 720 * follows that FD_DISK_CHANGE can only be cleared if there is a disk in 721 * the drive. 722 * 723 * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet. 724 * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on 725 * each seek. If a disk is present, the disk change line should also be 726 * cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk 727 * change line is set, this means either that no disk is in the drive, or 728 * that it has been removed since the last seek. 729 * 730 * This means that we really have a third possibility too: 731 * The floppy has been changed after the last seek. 732 */ 733 734 static int disk_change(int drive) 735 { 736 int fdc = FDC(drive); 737 738 if (time_before(jiffies, drive_state[drive].select_date + drive_params[drive].select_delay)) 739 DPRINT("WARNING disk change called early\n"); 740 if (!(fdc_state[fdc].dor & (0x10 << UNIT(drive))) || 741 (fdc_state[fdc].dor & 3) != UNIT(drive) || fdc != FDC(drive)) { 742 DPRINT("probing disk change on unselected drive\n"); 743 DPRINT("drive=%d fdc=%d dor=%x\n", drive, FDC(drive), 744 (unsigned int)fdc_state[fdc].dor); 745 } 746 747 debug_dcl(drive_params[drive].flags, 748 "checking disk change line for drive %d\n", drive); 749 debug_dcl(drive_params[drive].flags, "jiffies=%lu\n", jiffies); 750 debug_dcl(drive_params[drive].flags, "disk change line=%x\n", 751 fdc_inb(fdc, FD_DIR) & 0x80); 752 debug_dcl(drive_params[drive].flags, "flags=%lx\n", 753 drive_state[drive].flags); 754 755 if (drive_params[drive].flags & FD_BROKEN_DCL) 756 return test_bit(FD_DISK_CHANGED_BIT, 757 &drive_state[drive].flags); 758 if ((fdc_inb(fdc, FD_DIR) ^ drive_params[drive].flags) & 0x80) { 759 set_bit(FD_VERIFY_BIT, &drive_state[drive].flags); 760 /* verify write protection */ 761 762 if (drive_state[drive].maxblock) /* mark it changed */ 763 set_bit(FD_DISK_CHANGED_BIT, 764 &drive_state[drive].flags); 765 766 /* invalidate its geometry */ 767 if (drive_state[drive].keep_data >= 0) { 768 if ((drive_params[drive].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 drive_state[drive].last_checked = jiffies; 778 clear_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[drive].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 (fdc_state[fdc].address == -1) 802 return -1; 803 804 olddor = fdc_state[fdc].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(drive_params[drive].flags, 811 "calling disk change from set_dor\n"); 812 disk_change(drive); 813 } 814 fdc_state[fdc].dor = newdor; 815 fdc_outb(newdor, fdc, FD_DOR); 816 817 unit = newdor & 0x3; 818 if (!is_selected(olddor, unit) && is_selected(newdor, unit)) { 819 drive = REVDRIVE(fdc, unit); 820 drive_state[drive].select_date = jiffies; 821 } 822 } 823 return olddor; 824 } 825 826 static void twaddle(int fdc, int drive) 827 { 828 if (drive_params[drive].select_delay) 829 return; 830 fdc_outb(fdc_state[fdc].dor & ~(0x10 << UNIT(drive)), 831 fdc, FD_DOR); 832 fdc_outb(fdc_state[fdc].dor, fdc, FD_DOR); 833 drive_state[drive].select_date = jiffies; 834 } 835 836 /* 837 * Reset all driver information about the specified fdc. 838 * This is needed after a reset, and after a raw command. 839 */ 840 static void reset_fdc_info(int fdc, int mode) 841 { 842 int drive; 843 844 fdc_state[fdc].spec1 = fdc_state[fdc].spec2 = -1; 845 fdc_state[fdc].need_configure = 1; 846 fdc_state[fdc].perp_mode = 1; 847 fdc_state[fdc].rawcmd = 0; 848 for (drive = 0; drive < N_DRIVE; drive++) 849 if (FDC(drive) == fdc && 850 (mode || drive_state[drive].track != NEED_1_RECAL)) 851 drive_state[drive].track = NEED_2_RECAL; 852 } 853 854 /* 855 * selects the fdc and drive, and enables the fdc's input/dma. 856 * Both current_drive and current_fdc are changed to match the new drive. 857 */ 858 static void set_fdc(int drive) 859 { 860 unsigned int fdc; 861 862 if (drive < 0 || drive >= N_DRIVE) { 863 pr_info("bad drive value %d\n", drive); 864 return; 865 } 866 867 fdc = FDC(drive); 868 if (fdc >= N_FDC) { 869 pr_info("bad fdc value\n"); 870 return; 871 } 872 873 set_dor(fdc, ~0, 8); 874 #if N_FDC > 1 875 set_dor(1 - fdc, ~8, 0); 876 #endif 877 if (fdc_state[fdc].rawcmd == 2) 878 reset_fdc_info(fdc, 1); 879 if (fdc_inb(fdc, FD_STATUS) != STATUS_READY) 880 fdc_state[fdc].reset = 1; 881 882 current_drive = drive; 883 current_fdc = fdc; 884 } 885 886 /* 887 * locks the driver. 888 * Both current_drive and current_fdc are changed to match the new drive. 889 */ 890 static int lock_fdc(int drive) 891 { 892 if (WARN(atomic_read(&usage_count) == 0, 893 "Trying to lock fdc while usage count=0\n")) 894 return -1; 895 896 if (wait_event_interruptible(fdc_wait, !test_and_set_bit(0, &fdc_busy))) 897 return -EINTR; 898 899 command_status = FD_COMMAND_NONE; 900 901 reschedule_timeout(drive, "lock fdc"); 902 set_fdc(drive); 903 return 0; 904 } 905 906 /* unlocks the driver */ 907 static void unlock_fdc(void) 908 { 909 if (!test_bit(0, &fdc_busy)) 910 DPRINT("FDC access conflict!\n"); 911 912 raw_cmd = NULL; 913 command_status = FD_COMMAND_NONE; 914 cancel_delayed_work(&fd_timeout); 915 do_floppy = NULL; 916 cont = NULL; 917 clear_bit(0, &fdc_busy); 918 wake_up(&fdc_wait); 919 } 920 921 /* switches the motor off after a given timeout */ 922 static void motor_off_callback(struct timer_list *t) 923 { 924 unsigned long nr = t - motor_off_timer; 925 unsigned char mask = ~(0x10 << UNIT(nr)); 926 927 if (WARN_ON_ONCE(nr >= N_DRIVE)) 928 return; 929 930 set_dor(FDC(nr), mask, 0); 931 } 932 933 /* schedules motor off */ 934 static void floppy_off(unsigned int drive) 935 { 936 unsigned long volatile delta; 937 int fdc = FDC(drive); 938 939 if (!(fdc_state[fdc].dor & (0x10 << UNIT(drive)))) 940 return; 941 942 del_timer(motor_off_timer + drive); 943 944 /* make spindle stop in a position which minimizes spinup time 945 * next time */ 946 if (drive_params[drive].rps) { 947 delta = jiffies - drive_state[drive].first_read_date + HZ - 948 drive_params[drive].spindown_offset; 949 delta = ((delta * drive_params[drive].rps) % HZ) / drive_params[drive].rps; 950 motor_off_timer[drive].expires = 951 jiffies + drive_params[drive].spindown - delta; 952 } 953 add_timer(motor_off_timer + drive); 954 } 955 956 /* 957 * cycle through all N_DRIVE floppy drives, for disk change testing. 958 * stopping at current drive. This is done before any long operation, to 959 * be sure to have up to date disk change information. 960 */ 961 static void scandrives(void) 962 { 963 int i; 964 int drive; 965 int saved_drive; 966 967 if (drive_params[current_drive].select_delay) 968 return; 969 970 saved_drive = current_drive; 971 for (i = 0; i < N_DRIVE; i++) { 972 drive = (saved_drive + i + 1) % N_DRIVE; 973 if (drive_state[drive].fd_ref == 0 || drive_params[drive].select_delay != 0) 974 continue; /* skip closed drives */ 975 set_fdc(drive); 976 if (!(set_dor(current_fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) & 977 (0x10 << UNIT(drive)))) 978 /* switch the motor off again, if it was off to 979 * begin with */ 980 set_dor(current_fdc, ~(0x10 << UNIT(drive)), 0); 981 } 982 set_fdc(saved_drive); 983 } 984 985 static void empty(void) 986 { 987 } 988 989 static void (*floppy_work_fn)(void); 990 991 static void floppy_work_workfn(struct work_struct *work) 992 { 993 floppy_work_fn(); 994 } 995 996 static DECLARE_WORK(floppy_work, floppy_work_workfn); 997 998 static void schedule_bh(void (*handler)(void)) 999 { 1000 WARN_ON(work_pending(&floppy_work)); 1001 1002 floppy_work_fn = handler; 1003 queue_work(floppy_wq, &floppy_work); 1004 } 1005 1006 static void (*fd_timer_fn)(void) = NULL; 1007 1008 static void fd_timer_workfn(struct work_struct *work) 1009 { 1010 fd_timer_fn(); 1011 } 1012 1013 static DECLARE_DELAYED_WORK(fd_timer, fd_timer_workfn); 1014 1015 static void cancel_activity(void) 1016 { 1017 do_floppy = NULL; 1018 cancel_delayed_work(&fd_timer); 1019 cancel_work_sync(&floppy_work); 1020 } 1021 1022 /* this function makes sure that the disk stays in the drive during the 1023 * transfer */ 1024 static void fd_watchdog(void) 1025 { 1026 debug_dcl(drive_params[current_drive].flags, 1027 "calling disk change from watchdog\n"); 1028 1029 if (disk_change(current_drive)) { 1030 DPRINT("disk removed during i/o\n"); 1031 cancel_activity(); 1032 cont->done(0); 1033 reset_fdc(); 1034 } else { 1035 cancel_delayed_work(&fd_timer); 1036 fd_timer_fn = fd_watchdog; 1037 queue_delayed_work(floppy_wq, &fd_timer, HZ / 10); 1038 } 1039 } 1040 1041 static void main_command_interrupt(void) 1042 { 1043 cancel_delayed_work(&fd_timer); 1044 cont->interrupt(); 1045 } 1046 1047 /* waits for a delay (spinup or select) to pass */ 1048 static int fd_wait_for_completion(unsigned long expires, 1049 void (*function)(void)) 1050 { 1051 if (fdc_state[current_fdc].reset) { 1052 reset_fdc(); /* do the reset during sleep to win time 1053 * if we don't need to sleep, it's a good 1054 * occasion anyways */ 1055 return 1; 1056 } 1057 1058 if (time_before(jiffies, expires)) { 1059 cancel_delayed_work(&fd_timer); 1060 fd_timer_fn = function; 1061 queue_delayed_work(floppy_wq, &fd_timer, expires - jiffies); 1062 return 1; 1063 } 1064 return 0; 1065 } 1066 1067 static void setup_DMA(void) 1068 { 1069 unsigned long f; 1070 1071 if (raw_cmd->length == 0) { 1072 print_hex_dump(KERN_INFO, "zero dma transfer size: ", 1073 DUMP_PREFIX_NONE, 16, 1, 1074 raw_cmd->fullcmd, raw_cmd->cmd_count, false); 1075 cont->done(0); 1076 fdc_state[current_fdc].reset = 1; 1077 return; 1078 } 1079 if (((unsigned long)raw_cmd->kernel_data) % 512) { 1080 pr_info("non aligned address: %p\n", raw_cmd->kernel_data); 1081 cont->done(0); 1082 fdc_state[current_fdc].reset = 1; 1083 return; 1084 } 1085 f = claim_dma_lock(); 1086 fd_disable_dma(); 1087 #ifdef fd_dma_setup 1088 if (fd_dma_setup(raw_cmd->kernel_data, raw_cmd->length, 1089 (raw_cmd->flags & FD_RAW_READ) ? 1090 DMA_MODE_READ : DMA_MODE_WRITE, 1091 fdc_state[current_fdc].address) < 0) { 1092 release_dma_lock(f); 1093 cont->done(0); 1094 fdc_state[current_fdc].reset = 1; 1095 return; 1096 } 1097 release_dma_lock(f); 1098 #else 1099 fd_clear_dma_ff(); 1100 fd_cacheflush(raw_cmd->kernel_data, raw_cmd->length); 1101 fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ) ? 1102 DMA_MODE_READ : DMA_MODE_WRITE); 1103 fd_set_dma_addr(raw_cmd->kernel_data); 1104 fd_set_dma_count(raw_cmd->length); 1105 virtual_dma_port = fdc_state[current_fdc].address; 1106 fd_enable_dma(); 1107 release_dma_lock(f); 1108 #endif 1109 } 1110 1111 static void show_floppy(int fdc); 1112 1113 /* waits until the fdc becomes ready */ 1114 static int wait_til_ready(int fdc) 1115 { 1116 int status; 1117 int counter; 1118 1119 if (fdc_state[fdc].reset) 1120 return -1; 1121 for (counter = 0; counter < 10000; counter++) { 1122 status = fdc_inb(fdc, FD_STATUS); 1123 if (status & STATUS_READY) 1124 return status; 1125 } 1126 if (initialized) { 1127 DPRINT("Getstatus times out (%x) on fdc %d\n", status, fdc); 1128 show_floppy(fdc); 1129 } 1130 fdc_state[fdc].reset = 1; 1131 return -1; 1132 } 1133 1134 /* sends a command byte to the fdc */ 1135 static int output_byte(int fdc, char byte) 1136 { 1137 int status = wait_til_ready(fdc); 1138 1139 if (status < 0) 1140 return -1; 1141 1142 if (is_ready_state(status)) { 1143 fdc_outb(byte, fdc, FD_DATA); 1144 output_log[output_log_pos].data = byte; 1145 output_log[output_log_pos].status = status; 1146 output_log[output_log_pos].jiffies = jiffies; 1147 output_log_pos = (output_log_pos + 1) % OLOGSIZE; 1148 return 0; 1149 } 1150 fdc_state[fdc].reset = 1; 1151 if (initialized) { 1152 DPRINT("Unable to send byte %x to FDC. Fdc=%x Status=%x\n", 1153 byte, fdc, status); 1154 show_floppy(fdc); 1155 } 1156 return -1; 1157 } 1158 1159 /* gets the response from the fdc */ 1160 static int result(int fdc) 1161 { 1162 int i; 1163 int status = 0; 1164 1165 for (i = 0; i < FD_RAW_REPLY_SIZE; i++) { 1166 status = wait_til_ready(fdc); 1167 if (status < 0) 1168 break; 1169 status &= STATUS_DIR | STATUS_READY | STATUS_BUSY | STATUS_DMA; 1170 if ((status & ~STATUS_BUSY) == STATUS_READY) { 1171 resultjiffies = jiffies; 1172 resultsize = i; 1173 return i; 1174 } 1175 if (status == (STATUS_DIR | STATUS_READY | STATUS_BUSY)) 1176 reply_buffer[i] = fdc_inb(fdc, FD_DATA); 1177 else 1178 break; 1179 } 1180 if (initialized) { 1181 DPRINT("get result error. Fdc=%d Last status=%x Read bytes=%d\n", 1182 fdc, status, i); 1183 show_floppy(fdc); 1184 } 1185 fdc_state[fdc].reset = 1; 1186 return -1; 1187 } 1188 1189 #define MORE_OUTPUT -2 1190 /* does the fdc need more output? */ 1191 static int need_more_output(int fdc) 1192 { 1193 int status = wait_til_ready(fdc); 1194 1195 if (status < 0) 1196 return -1; 1197 1198 if (is_ready_state(status)) 1199 return MORE_OUTPUT; 1200 1201 return result(fdc); 1202 } 1203 1204 /* Set perpendicular mode as required, based on data rate, if supported. 1205 * 82077 Now tested. 1Mbps data rate only possible with 82077-1. 1206 */ 1207 static void perpendicular_mode(int fdc) 1208 { 1209 unsigned char perp_mode; 1210 1211 if (raw_cmd->rate & 0x40) { 1212 switch (raw_cmd->rate & 3) { 1213 case 0: 1214 perp_mode = 2; 1215 break; 1216 case 3: 1217 perp_mode = 3; 1218 break; 1219 default: 1220 DPRINT("Invalid data rate for perpendicular mode!\n"); 1221 cont->done(0); 1222 fdc_state[fdc].reset = 1; 1223 /* 1224 * convenient way to return to 1225 * redo without too much hassle 1226 * (deep stack et al.) 1227 */ 1228 return; 1229 } 1230 } else 1231 perp_mode = 0; 1232 1233 if (fdc_state[fdc].perp_mode == perp_mode) 1234 return; 1235 if (fdc_state[fdc].version >= FDC_82077_ORIG) { 1236 output_byte(fdc, FD_PERPENDICULAR); 1237 output_byte(fdc, perp_mode); 1238 fdc_state[fdc].perp_mode = perp_mode; 1239 } else if (perp_mode) { 1240 DPRINT("perpendicular mode not supported by this FDC.\n"); 1241 } 1242 } /* perpendicular_mode */ 1243 1244 static int fifo_depth = 0xa; 1245 static int no_fifo; 1246 1247 static int fdc_configure(int fdc) 1248 { 1249 /* Turn on FIFO */ 1250 output_byte(fdc, FD_CONFIGURE); 1251 if (need_more_output(fdc) != MORE_OUTPUT) 1252 return 0; 1253 output_byte(fdc, 0); 1254 output_byte(fdc, 0x10 | (no_fifo & 0x20) | (fifo_depth & 0xf)); 1255 output_byte(fdc, 0); /* pre-compensation from track 0 upwards */ 1256 return 1; 1257 } 1258 1259 #define NOMINAL_DTR 500 1260 1261 /* Issue a "SPECIFY" command to set the step rate time, head unload time, 1262 * head load time, and DMA disable flag to values needed by floppy. 1263 * 1264 * The value "dtr" is the data transfer rate in Kbps. It is needed 1265 * to account for the data rate-based scaling done by the 82072 and 82077 1266 * FDC types. This parameter is ignored for other types of FDCs (i.e. 1267 * 8272a). 1268 * 1269 * Note that changing the data transfer rate has a (probably deleterious) 1270 * effect on the parameters subject to scaling for 82072/82077 FDCs, so 1271 * fdc_specify is called again after each data transfer rate 1272 * change. 1273 * 1274 * srt: 1000 to 16000 in microseconds 1275 * hut: 16 to 240 milliseconds 1276 * hlt: 2 to 254 milliseconds 1277 * 1278 * These values are rounded up to the next highest available delay time. 1279 */ 1280 static void fdc_specify(int fdc, int drive) 1281 { 1282 unsigned char spec1; 1283 unsigned char spec2; 1284 unsigned long srt; 1285 unsigned long hlt; 1286 unsigned long hut; 1287 unsigned long dtr = NOMINAL_DTR; 1288 unsigned long scale_dtr = NOMINAL_DTR; 1289 int hlt_max_code = 0x7f; 1290 int hut_max_code = 0xf; 1291 1292 if (fdc_state[fdc].need_configure && 1293 fdc_state[fdc].version >= FDC_82072A) { 1294 fdc_configure(fdc); 1295 fdc_state[fdc].need_configure = 0; 1296 } 1297 1298 switch (raw_cmd->rate & 0x03) { 1299 case 3: 1300 dtr = 1000; 1301 break; 1302 case 1: 1303 dtr = 300; 1304 if (fdc_state[fdc].version >= FDC_82078) { 1305 /* chose the default rate table, not the one 1306 * where 1 = 2 Mbps */ 1307 output_byte(fdc, FD_DRIVESPEC); 1308 if (need_more_output(fdc) == MORE_OUTPUT) { 1309 output_byte(fdc, UNIT(drive)); 1310 output_byte(fdc, 0xc0); 1311 } 1312 } 1313 break; 1314 case 2: 1315 dtr = 250; 1316 break; 1317 } 1318 1319 if (fdc_state[fdc].version >= FDC_82072) { 1320 scale_dtr = dtr; 1321 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */ 1322 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */ 1323 } 1324 1325 /* Convert step rate from microseconds to milliseconds and 4 bits */ 1326 srt = 16 - DIV_ROUND_UP(drive_params[drive].srt * scale_dtr / 1000, 1327 NOMINAL_DTR); 1328 if (slow_floppy) 1329 srt = srt / 4; 1330 1331 SUPBOUND(srt, 0xf); 1332 INFBOUND(srt, 0); 1333 1334 hlt = DIV_ROUND_UP(drive_params[drive].hlt * scale_dtr / 2, 1335 NOMINAL_DTR); 1336 if (hlt < 0x01) 1337 hlt = 0x01; 1338 else if (hlt > 0x7f) 1339 hlt = hlt_max_code; 1340 1341 hut = DIV_ROUND_UP(drive_params[drive].hut * scale_dtr / 16, 1342 NOMINAL_DTR); 1343 if (hut < 0x1) 1344 hut = 0x1; 1345 else if (hut > 0xf) 1346 hut = hut_max_code; 1347 1348 spec1 = (srt << 4) | hut; 1349 spec2 = (hlt << 1) | (use_virtual_dma & 1); 1350 1351 /* If these parameters did not change, just return with success */ 1352 if (fdc_state[fdc].spec1 != spec1 || 1353 fdc_state[fdc].spec2 != spec2) { 1354 /* Go ahead and set spec1 and spec2 */ 1355 output_byte(fdc, FD_SPECIFY); 1356 output_byte(fdc, fdc_state[fdc].spec1 = spec1); 1357 output_byte(fdc, fdc_state[fdc].spec2 = spec2); 1358 } 1359 } /* fdc_specify */ 1360 1361 /* Set the FDC's data transfer rate on behalf of the specified drive. 1362 * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue 1363 * of the specify command (i.e. using the fdc_specify function). 1364 */ 1365 static int fdc_dtr(void) 1366 { 1367 /* If data rate not already set to desired value, set it. */ 1368 if ((raw_cmd->rate & 3) == fdc_state[current_fdc].dtr) 1369 return 0; 1370 1371 /* Set dtr */ 1372 fdc_outb(raw_cmd->rate & 3, current_fdc, FD_DCR); 1373 1374 /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB) 1375 * need a stabilization period of several milliseconds to be 1376 * enforced after data rate changes before R/W operations. 1377 * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies) 1378 */ 1379 fdc_state[current_fdc].dtr = raw_cmd->rate & 3; 1380 return fd_wait_for_completion(jiffies + 2UL * HZ / 100, floppy_ready); 1381 } /* fdc_dtr */ 1382 1383 static void tell_sector(void) 1384 { 1385 pr_cont(": track %d, head %d, sector %d, size %d", 1386 reply_buffer[R_TRACK], reply_buffer[R_HEAD], 1387 reply_buffer[R_SECTOR], 1388 reply_buffer[R_SIZECODE]); 1389 } /* tell_sector */ 1390 1391 static void print_errors(void) 1392 { 1393 DPRINT(""); 1394 if (reply_buffer[ST0] & ST0_ECE) { 1395 pr_cont("Recalibrate failed!"); 1396 } else if (reply_buffer[ST2] & ST2_CRC) { 1397 pr_cont("data CRC error"); 1398 tell_sector(); 1399 } else if (reply_buffer[ST1] & ST1_CRC) { 1400 pr_cont("CRC error"); 1401 tell_sector(); 1402 } else if ((reply_buffer[ST1] & (ST1_MAM | ST1_ND)) || 1403 (reply_buffer[ST2] & ST2_MAM)) { 1404 if (!probing) { 1405 pr_cont("sector not found"); 1406 tell_sector(); 1407 } else 1408 pr_cont("probe failed..."); 1409 } else if (reply_buffer[ST2] & ST2_WC) { /* seek error */ 1410 pr_cont("wrong cylinder"); 1411 } else if (reply_buffer[ST2] & ST2_BC) { /* cylinder marked as bad */ 1412 pr_cont("bad cylinder"); 1413 } else { 1414 pr_cont("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x", 1415 reply_buffer[ST0], reply_buffer[ST1], 1416 reply_buffer[ST2]); 1417 tell_sector(); 1418 } 1419 pr_cont("\n"); 1420 } 1421 1422 /* 1423 * OK, this error interpreting routine is called after a 1424 * DMA read/write has succeeded 1425 * or failed, so we check the results, and copy any buffers. 1426 * hhb: Added better error reporting. 1427 * ak: Made this into a separate routine. 1428 */ 1429 static int interpret_errors(void) 1430 { 1431 char bad; 1432 1433 if (inr != 7) { 1434 DPRINT("-- FDC reply error\n"); 1435 fdc_state[current_fdc].reset = 1; 1436 return 1; 1437 } 1438 1439 /* check IC to find cause of interrupt */ 1440 switch (reply_buffer[ST0] & ST0_INTR) { 1441 case 0x40: /* error occurred during command execution */ 1442 if (reply_buffer[ST1] & ST1_EOC) 1443 return 0; /* occurs with pseudo-DMA */ 1444 bad = 1; 1445 if (reply_buffer[ST1] & ST1_WP) { 1446 DPRINT("Drive is write protected\n"); 1447 clear_bit(FD_DISK_WRITABLE_BIT, 1448 &drive_state[current_drive].flags); 1449 cont->done(0); 1450 bad = 2; 1451 } else if (reply_buffer[ST1] & ST1_ND) { 1452 set_bit(FD_NEED_TWADDLE_BIT, 1453 &drive_state[current_drive].flags); 1454 } else if (reply_buffer[ST1] & ST1_OR) { 1455 if (drive_params[current_drive].flags & FTD_MSG) 1456 DPRINT("Over/Underrun - retrying\n"); 1457 bad = 0; 1458 } else if (*errors >= drive_params[current_drive].max_errors.reporting) { 1459 print_errors(); 1460 } 1461 if (reply_buffer[ST2] & ST2_WC || reply_buffer[ST2] & ST2_BC) 1462 /* wrong cylinder => recal */ 1463 drive_state[current_drive].track = NEED_2_RECAL; 1464 return bad; 1465 case 0x80: /* invalid command given */ 1466 DPRINT("Invalid FDC command given!\n"); 1467 cont->done(0); 1468 return 2; 1469 case 0xc0: 1470 DPRINT("Abnormal termination caused by polling\n"); 1471 cont->error(); 1472 return 2; 1473 default: /* (0) Normal command termination */ 1474 return 0; 1475 } 1476 } 1477 1478 /* 1479 * This routine is called when everything should be correctly set up 1480 * for the transfer (i.e. floppy motor is on, the correct floppy is 1481 * selected, and the head is sitting on the right track). 1482 */ 1483 static void setup_rw_floppy(void) 1484 { 1485 int i; 1486 int r; 1487 int flags; 1488 unsigned long ready_date; 1489 void (*function)(void); 1490 1491 flags = raw_cmd->flags; 1492 if (flags & (FD_RAW_READ | FD_RAW_WRITE)) 1493 flags |= FD_RAW_INTR; 1494 1495 if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)) { 1496 ready_date = drive_state[current_drive].spinup_date + drive_params[current_drive].spinup; 1497 /* If spinup will take a long time, rerun scandrives 1498 * again just before spinup completion. Beware that 1499 * after scandrives, we must again wait for selection. 1500 */ 1501 if (time_after(ready_date, jiffies + drive_params[current_drive].select_delay)) { 1502 ready_date -= drive_params[current_drive].select_delay; 1503 function = floppy_start; 1504 } else 1505 function = setup_rw_floppy; 1506 1507 /* wait until the floppy is spinning fast enough */ 1508 if (fd_wait_for_completion(ready_date, function)) 1509 return; 1510 } 1511 if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE)) 1512 setup_DMA(); 1513 1514 if (flags & FD_RAW_INTR) 1515 do_floppy = main_command_interrupt; 1516 1517 r = 0; 1518 for (i = 0; i < raw_cmd->cmd_count; i++) 1519 r |= output_byte(current_fdc, raw_cmd->fullcmd[i]); 1520 1521 debugt(__func__, "rw_command"); 1522 1523 if (r) { 1524 cont->error(); 1525 reset_fdc(); 1526 return; 1527 } 1528 1529 if (!(flags & FD_RAW_INTR)) { 1530 inr = result(current_fdc); 1531 cont->interrupt(); 1532 } else if (flags & FD_RAW_NEED_DISK) 1533 fd_watchdog(); 1534 } 1535 1536 static int blind_seek; 1537 1538 /* 1539 * This is the routine called after every seek (or recalibrate) interrupt 1540 * from the floppy controller. 1541 */ 1542 static void seek_interrupt(void) 1543 { 1544 debugt(__func__, ""); 1545 if (inr != 2 || (reply_buffer[ST0] & 0xF8) != 0x20) { 1546 DPRINT("seek failed\n"); 1547 drive_state[current_drive].track = NEED_2_RECAL; 1548 cont->error(); 1549 cont->redo(); 1550 return; 1551 } 1552 if (drive_state[current_drive].track >= 0 && 1553 drive_state[current_drive].track != reply_buffer[ST1] && 1554 !blind_seek) { 1555 debug_dcl(drive_params[current_drive].flags, 1556 "clearing NEWCHANGE flag because of effective seek\n"); 1557 debug_dcl(drive_params[current_drive].flags, "jiffies=%lu\n", 1558 jiffies); 1559 clear_bit(FD_DISK_NEWCHANGE_BIT, 1560 &drive_state[current_drive].flags); 1561 /* effective seek */ 1562 drive_state[current_drive].select_date = jiffies; 1563 } 1564 drive_state[current_drive].track = reply_buffer[ST1]; 1565 floppy_ready(); 1566 } 1567 1568 static void check_wp(int fdc, int drive) 1569 { 1570 if (test_bit(FD_VERIFY_BIT, &drive_state[drive].flags)) { 1571 /* check write protection */ 1572 output_byte(fdc, FD_GETSTATUS); 1573 output_byte(fdc, UNIT(drive)); 1574 if (result(fdc) != 1) { 1575 fdc_state[fdc].reset = 1; 1576 return; 1577 } 1578 clear_bit(FD_VERIFY_BIT, &drive_state[drive].flags); 1579 clear_bit(FD_NEED_TWADDLE_BIT, 1580 &drive_state[drive].flags); 1581 debug_dcl(drive_params[drive].flags, 1582 "checking whether disk is write protected\n"); 1583 debug_dcl(drive_params[drive].flags, "wp=%x\n", 1584 reply_buffer[ST3] & 0x40); 1585 if (!(reply_buffer[ST3] & 0x40)) 1586 set_bit(FD_DISK_WRITABLE_BIT, 1587 &drive_state[drive].flags); 1588 else 1589 clear_bit(FD_DISK_WRITABLE_BIT, 1590 &drive_state[drive].flags); 1591 } 1592 } 1593 1594 static void seek_floppy(void) 1595 { 1596 int track; 1597 1598 blind_seek = 0; 1599 1600 debug_dcl(drive_params[current_drive].flags, 1601 "calling disk change from %s\n", __func__); 1602 1603 if (!test_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[current_drive].flags) && 1604 disk_change(current_drive) && (raw_cmd->flags & FD_RAW_NEED_DISK)) { 1605 /* the media changed flag should be cleared after the seek. 1606 * If it isn't, this means that there is really no disk in 1607 * the drive. 1608 */ 1609 set_bit(FD_DISK_CHANGED_BIT, 1610 &drive_state[current_drive].flags); 1611 cont->done(0); 1612 cont->redo(); 1613 return; 1614 } 1615 if (drive_state[current_drive].track <= NEED_1_RECAL) { 1616 recalibrate_floppy(); 1617 return; 1618 } else if (test_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[current_drive].flags) && 1619 (raw_cmd->flags & FD_RAW_NEED_DISK) && 1620 (drive_state[current_drive].track <= NO_TRACK || drive_state[current_drive].track == raw_cmd->track)) { 1621 /* we seek to clear the media-changed condition. Does anybody 1622 * know a more elegant way, which works on all drives? */ 1623 if (raw_cmd->track) 1624 track = raw_cmd->track - 1; 1625 else { 1626 if (drive_params[current_drive].flags & FD_SILENT_DCL_CLEAR) { 1627 set_dor(current_fdc, ~(0x10 << UNIT(current_drive)), 0); 1628 blind_seek = 1; 1629 raw_cmd->flags |= FD_RAW_NEED_SEEK; 1630 } 1631 track = 1; 1632 } 1633 } else { 1634 check_wp(current_fdc, current_drive); 1635 if (raw_cmd->track != drive_state[current_drive].track && 1636 (raw_cmd->flags & FD_RAW_NEED_SEEK)) 1637 track = raw_cmd->track; 1638 else { 1639 setup_rw_floppy(); 1640 return; 1641 } 1642 } 1643 1644 do_floppy = seek_interrupt; 1645 output_byte(current_fdc, FD_SEEK); 1646 output_byte(current_fdc, UNIT(current_drive)); 1647 if (output_byte(current_fdc, track) < 0) { 1648 reset_fdc(); 1649 return; 1650 } 1651 debugt(__func__, ""); 1652 } 1653 1654 static void recal_interrupt(void) 1655 { 1656 debugt(__func__, ""); 1657 if (inr != 2) 1658 fdc_state[current_fdc].reset = 1; 1659 else if (reply_buffer[ST0] & ST0_ECE) { 1660 switch (drive_state[current_drive].track) { 1661 case NEED_1_RECAL: 1662 debugt(__func__, "need 1 recal"); 1663 /* after a second recalibrate, we still haven't 1664 * reached track 0. Probably no drive. Raise an 1665 * error, as failing immediately might upset 1666 * computers possessed by the Devil :-) */ 1667 cont->error(); 1668 cont->redo(); 1669 return; 1670 case NEED_2_RECAL: 1671 debugt(__func__, "need 2 recal"); 1672 /* If we already did a recalibrate, 1673 * and we are not at track 0, this 1674 * means we have moved. (The only way 1675 * not to move at recalibration is to 1676 * be already at track 0.) Clear the 1677 * new change flag */ 1678 debug_dcl(drive_params[current_drive].flags, 1679 "clearing NEWCHANGE flag because of second recalibrate\n"); 1680 1681 clear_bit(FD_DISK_NEWCHANGE_BIT, 1682 &drive_state[current_drive].flags); 1683 drive_state[current_drive].select_date = jiffies; 1684 fallthrough; 1685 default: 1686 debugt(__func__, "default"); 1687 /* Recalibrate moves the head by at 1688 * most 80 steps. If after one 1689 * recalibrate we don't have reached 1690 * track 0, this might mean that we 1691 * started beyond track 80. Try 1692 * again. */ 1693 drive_state[current_drive].track = NEED_1_RECAL; 1694 break; 1695 } 1696 } else 1697 drive_state[current_drive].track = reply_buffer[ST1]; 1698 floppy_ready(); 1699 } 1700 1701 static void print_result(char *message, int inr) 1702 { 1703 int i; 1704 1705 DPRINT("%s ", message); 1706 if (inr >= 0) 1707 for (i = 0; i < inr; i++) 1708 pr_cont("repl[%d]=%x ", i, reply_buffer[i]); 1709 pr_cont("\n"); 1710 } 1711 1712 /* interrupt handler. Note that this can be called externally on the Sparc */ 1713 irqreturn_t floppy_interrupt(int irq, void *dev_id) 1714 { 1715 int do_print; 1716 unsigned long f; 1717 void (*handler)(void) = do_floppy; 1718 1719 lasthandler = handler; 1720 interruptjiffies = jiffies; 1721 1722 f = claim_dma_lock(); 1723 fd_disable_dma(); 1724 release_dma_lock(f); 1725 1726 do_floppy = NULL; 1727 if (current_fdc >= N_FDC || fdc_state[current_fdc].address == -1) { 1728 /* we don't even know which FDC is the culprit */ 1729 pr_info("DOR0=%x\n", fdc_state[0].dor); 1730 pr_info("floppy interrupt on bizarre fdc %d\n", current_fdc); 1731 pr_info("handler=%ps\n", handler); 1732 is_alive(__func__, "bizarre fdc"); 1733 return IRQ_NONE; 1734 } 1735 1736 fdc_state[current_fdc].reset = 0; 1737 /* We have to clear the reset flag here, because apparently on boxes 1738 * with level triggered interrupts (PS/2, Sparc, ...), it is needed to 1739 * emit SENSEI's to clear the interrupt line. And fdc_state[fdc].reset 1740 * blocks the emission of the SENSEI's. 1741 * It is OK to emit floppy commands because we are in an interrupt 1742 * handler here, and thus we have to fear no interference of other 1743 * activity. 1744 */ 1745 1746 do_print = !handler && print_unex && initialized; 1747 1748 inr = result(current_fdc); 1749 if (do_print) 1750 print_result("unexpected interrupt", inr); 1751 if (inr == 0) { 1752 int max_sensei = 4; 1753 do { 1754 output_byte(current_fdc, FD_SENSEI); 1755 inr = result(current_fdc); 1756 if (do_print) 1757 print_result("sensei", inr); 1758 max_sensei--; 1759 } while ((reply_buffer[ST0] & 0x83) != UNIT(current_drive) && 1760 inr == 2 && max_sensei); 1761 } 1762 if (!handler) { 1763 fdc_state[current_fdc].reset = 1; 1764 return IRQ_NONE; 1765 } 1766 schedule_bh(handler); 1767 is_alive(__func__, "normal interrupt end"); 1768 1769 /* FIXME! Was it really for us? */ 1770 return IRQ_HANDLED; 1771 } 1772 1773 static void recalibrate_floppy(void) 1774 { 1775 debugt(__func__, ""); 1776 do_floppy = recal_interrupt; 1777 output_byte(current_fdc, FD_RECALIBRATE); 1778 if (output_byte(current_fdc, UNIT(current_drive)) < 0) 1779 reset_fdc(); 1780 } 1781 1782 /* 1783 * Must do 4 FD_SENSEIs after reset because of ``drive polling''. 1784 */ 1785 static void reset_interrupt(void) 1786 { 1787 debugt(__func__, ""); 1788 result(current_fdc); /* get the status ready for set_fdc */ 1789 if (fdc_state[current_fdc].reset) { 1790 pr_info("reset set in interrupt, calling %ps\n", cont->error); 1791 cont->error(); /* a reset just after a reset. BAD! */ 1792 } 1793 cont->redo(); 1794 } 1795 1796 /* 1797 * reset is done by pulling bit 2 of DOR low for a while (old FDCs), 1798 * or by setting the self clearing bit 7 of STATUS (newer FDCs). 1799 * This WILL trigger an interrupt, causing the handlers in the current 1800 * cont's ->redo() to be called via reset_interrupt(). 1801 */ 1802 static void reset_fdc(void) 1803 { 1804 unsigned long flags; 1805 1806 do_floppy = reset_interrupt; 1807 fdc_state[current_fdc].reset = 0; 1808 reset_fdc_info(current_fdc, 0); 1809 1810 /* Pseudo-DMA may intercept 'reset finished' interrupt. */ 1811 /* Irrelevant for systems with true DMA (i386). */ 1812 1813 flags = claim_dma_lock(); 1814 fd_disable_dma(); 1815 release_dma_lock(flags); 1816 1817 if (fdc_state[current_fdc].version >= FDC_82072A) 1818 fdc_outb(0x80 | (fdc_state[current_fdc].dtr & 3), 1819 current_fdc, FD_STATUS); 1820 else { 1821 fdc_outb(fdc_state[current_fdc].dor & ~0x04, current_fdc, FD_DOR); 1822 udelay(FD_RESET_DELAY); 1823 fdc_outb(fdc_state[current_fdc].dor, current_fdc, FD_DOR); 1824 } 1825 } 1826 1827 static void show_floppy(int fdc) 1828 { 1829 int i; 1830 1831 pr_info("\n"); 1832 pr_info("floppy driver state\n"); 1833 pr_info("-------------------\n"); 1834 pr_info("now=%lu last interrupt=%lu diff=%lu last called handler=%ps\n", 1835 jiffies, interruptjiffies, jiffies - interruptjiffies, 1836 lasthandler); 1837 1838 pr_info("timeout_message=%s\n", timeout_message); 1839 pr_info("last output bytes:\n"); 1840 for (i = 0; i < OLOGSIZE; i++) 1841 pr_info("%2x %2x %lu\n", 1842 output_log[(i + output_log_pos) % OLOGSIZE].data, 1843 output_log[(i + output_log_pos) % OLOGSIZE].status, 1844 output_log[(i + output_log_pos) % OLOGSIZE].jiffies); 1845 pr_info("last result at %lu\n", resultjiffies); 1846 pr_info("last redo_fd_request at %lu\n", lastredo); 1847 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1, 1848 reply_buffer, resultsize, true); 1849 1850 pr_info("status=%x\n", fdc_inb(fdc, FD_STATUS)); 1851 pr_info("fdc_busy=%lu\n", fdc_busy); 1852 if (do_floppy) 1853 pr_info("do_floppy=%ps\n", do_floppy); 1854 if (work_pending(&floppy_work)) 1855 pr_info("floppy_work.func=%ps\n", floppy_work.func); 1856 if (delayed_work_pending(&fd_timer)) 1857 pr_info("delayed work.function=%p expires=%ld\n", 1858 fd_timer.work.func, 1859 fd_timer.timer.expires - jiffies); 1860 if (delayed_work_pending(&fd_timeout)) 1861 pr_info("timer_function=%p expires=%ld\n", 1862 fd_timeout.work.func, 1863 fd_timeout.timer.expires - jiffies); 1864 1865 pr_info("cont=%p\n", cont); 1866 pr_info("current_req=%p\n", current_req); 1867 pr_info("command_status=%d\n", command_status); 1868 pr_info("\n"); 1869 } 1870 1871 static void floppy_shutdown(struct work_struct *arg) 1872 { 1873 unsigned long flags; 1874 1875 if (initialized) 1876 show_floppy(current_fdc); 1877 cancel_activity(); 1878 1879 flags = claim_dma_lock(); 1880 fd_disable_dma(); 1881 release_dma_lock(flags); 1882 1883 /* avoid dma going to a random drive after shutdown */ 1884 1885 if (initialized) 1886 DPRINT("floppy timeout called\n"); 1887 fdc_state[current_fdc].reset = 1; 1888 if (cont) { 1889 cont->done(0); 1890 cont->redo(); /* this will recall reset when needed */ 1891 } else { 1892 pr_info("no cont in shutdown!\n"); 1893 process_fd_request(); 1894 } 1895 is_alive(__func__, ""); 1896 } 1897 1898 /* start motor, check media-changed condition and write protection */ 1899 static int start_motor(void (*function)(void)) 1900 { 1901 int mask; 1902 int data; 1903 1904 mask = 0xfc; 1905 data = UNIT(current_drive); 1906 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)) { 1907 if (!(fdc_state[current_fdc].dor & (0x10 << UNIT(current_drive)))) { 1908 set_debugt(); 1909 /* no read since this drive is running */ 1910 drive_state[current_drive].first_read_date = 0; 1911 /* note motor start time if motor is not yet running */ 1912 drive_state[current_drive].spinup_date = jiffies; 1913 data |= (0x10 << UNIT(current_drive)); 1914 } 1915 } else if (fdc_state[current_fdc].dor & (0x10 << UNIT(current_drive))) 1916 mask &= ~(0x10 << UNIT(current_drive)); 1917 1918 /* starts motor and selects floppy */ 1919 del_timer(motor_off_timer + current_drive); 1920 set_dor(current_fdc, mask, data); 1921 1922 /* wait_for_completion also schedules reset if needed. */ 1923 return fd_wait_for_completion(drive_state[current_drive].select_date + drive_params[current_drive].select_delay, 1924 function); 1925 } 1926 1927 static void floppy_ready(void) 1928 { 1929 if (fdc_state[current_fdc].reset) { 1930 reset_fdc(); 1931 return; 1932 } 1933 if (start_motor(floppy_ready)) 1934 return; 1935 if (fdc_dtr()) 1936 return; 1937 1938 debug_dcl(drive_params[current_drive].flags, 1939 "calling disk change from floppy_ready\n"); 1940 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) && 1941 disk_change(current_drive) && !drive_params[current_drive].select_delay) 1942 twaddle(current_fdc, current_drive); /* this clears the dcl on certain 1943 * drive/controller combinations */ 1944 1945 #ifdef fd_chose_dma_mode 1946 if ((raw_cmd->flags & FD_RAW_READ) || (raw_cmd->flags & FD_RAW_WRITE)) { 1947 unsigned long flags = claim_dma_lock(); 1948 fd_chose_dma_mode(raw_cmd->kernel_data, raw_cmd->length); 1949 release_dma_lock(flags); 1950 } 1951 #endif 1952 1953 if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)) { 1954 perpendicular_mode(current_fdc); 1955 fdc_specify(current_fdc, current_drive); /* must be done here because of hut, hlt ... */ 1956 seek_floppy(); 1957 } else { 1958 if ((raw_cmd->flags & FD_RAW_READ) || 1959 (raw_cmd->flags & FD_RAW_WRITE)) 1960 fdc_specify(current_fdc, current_drive); 1961 setup_rw_floppy(); 1962 } 1963 } 1964 1965 static void floppy_start(void) 1966 { 1967 reschedule_timeout(current_drive, "floppy start"); 1968 1969 scandrives(); 1970 debug_dcl(drive_params[current_drive].flags, 1971 "setting NEWCHANGE in floppy_start\n"); 1972 set_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[current_drive].flags); 1973 floppy_ready(); 1974 } 1975 1976 /* 1977 * ======================================================================== 1978 * here ends the bottom half. Exported routines are: 1979 * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc, 1980 * start_motor, reset_fdc, reset_fdc_info, interpret_errors. 1981 * Initialization also uses output_byte, result, set_dor, floppy_interrupt 1982 * and set_dor. 1983 * ======================================================================== 1984 */ 1985 /* 1986 * General purpose continuations. 1987 * ============================== 1988 */ 1989 1990 static void do_wakeup(void) 1991 { 1992 reschedule_timeout(MAXTIMEOUT, "do wakeup"); 1993 cont = NULL; 1994 command_status += 2; 1995 wake_up(&command_done); 1996 } 1997 1998 static const struct cont_t wakeup_cont = { 1999 .interrupt = empty, 2000 .redo = do_wakeup, 2001 .error = empty, 2002 .done = (done_f)empty 2003 }; 2004 2005 static const struct cont_t intr_cont = { 2006 .interrupt = empty, 2007 .redo = process_fd_request, 2008 .error = empty, 2009 .done = (done_f)empty 2010 }; 2011 2012 /* schedules handler, waiting for completion. May be interrupted, will then 2013 * return -EINTR, in which case the driver will automatically be unlocked. 2014 */ 2015 static int wait_til_done(void (*handler)(void), bool interruptible) 2016 { 2017 int ret; 2018 2019 schedule_bh(handler); 2020 2021 if (interruptible) 2022 wait_event_interruptible(command_done, command_status >= 2); 2023 else 2024 wait_event(command_done, command_status >= 2); 2025 2026 if (command_status < 2) { 2027 cancel_activity(); 2028 cont = &intr_cont; 2029 reset_fdc(); 2030 return -EINTR; 2031 } 2032 2033 if (fdc_state[current_fdc].reset) 2034 command_status = FD_COMMAND_ERROR; 2035 if (command_status == FD_COMMAND_OKAY) 2036 ret = 0; 2037 else 2038 ret = -EIO; 2039 command_status = FD_COMMAND_NONE; 2040 return ret; 2041 } 2042 2043 static void generic_done(int result) 2044 { 2045 command_status = result; 2046 cont = &wakeup_cont; 2047 } 2048 2049 static void generic_success(void) 2050 { 2051 cont->done(1); 2052 } 2053 2054 static void generic_failure(void) 2055 { 2056 cont->done(0); 2057 } 2058 2059 static void success_and_wakeup(void) 2060 { 2061 generic_success(); 2062 cont->redo(); 2063 } 2064 2065 /* 2066 * formatting and rw support. 2067 * ========================== 2068 */ 2069 2070 static int next_valid_format(int drive) 2071 { 2072 int probed_format; 2073 2074 probed_format = drive_state[drive].probed_format; 2075 while (1) { 2076 if (probed_format >= FD_AUTODETECT_SIZE || 2077 !drive_params[drive].autodetect[probed_format]) { 2078 drive_state[drive].probed_format = 0; 2079 return 1; 2080 } 2081 if (floppy_type[drive_params[drive].autodetect[probed_format]].sect) { 2082 drive_state[drive].probed_format = probed_format; 2083 return 0; 2084 } 2085 probed_format++; 2086 } 2087 } 2088 2089 static void bad_flp_intr(void) 2090 { 2091 int err_count; 2092 2093 if (probing) { 2094 drive_state[current_drive].probed_format++; 2095 if (!next_valid_format(current_drive)) 2096 return; 2097 } 2098 err_count = ++(*errors); 2099 INFBOUND(write_errors[current_drive].badness, err_count); 2100 if (err_count > drive_params[current_drive].max_errors.abort) 2101 cont->done(0); 2102 if (err_count > drive_params[current_drive].max_errors.reset) 2103 fdc_state[current_fdc].reset = 1; 2104 else if (err_count > drive_params[current_drive].max_errors.recal) 2105 drive_state[current_drive].track = NEED_2_RECAL; 2106 } 2107 2108 static void set_floppy(int drive) 2109 { 2110 int type = ITYPE(drive_state[drive].fd_device); 2111 2112 if (type) 2113 _floppy = floppy_type + type; 2114 else 2115 _floppy = current_type[drive]; 2116 } 2117 2118 /* 2119 * formatting support. 2120 * =================== 2121 */ 2122 static void format_interrupt(void) 2123 { 2124 switch (interpret_errors()) { 2125 case 1: 2126 cont->error(); 2127 break; 2128 case 2: 2129 break; 2130 case 0: 2131 cont->done(1); 2132 } 2133 cont->redo(); 2134 } 2135 2136 #define FM_MODE(x, y) ((y) & ~(((x)->rate & 0x80) >> 1)) 2137 #define CT(x) ((x) | 0xc0) 2138 2139 static void setup_format_params(int track) 2140 { 2141 int n; 2142 int il; 2143 int count; 2144 int head_shift; 2145 int track_shift; 2146 struct fparm { 2147 unsigned char track, head, sect, size; 2148 } *here = (struct fparm *)floppy_track_buffer; 2149 2150 raw_cmd = &default_raw_cmd; 2151 raw_cmd->track = track; 2152 2153 raw_cmd->flags = (FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN | 2154 FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK); 2155 raw_cmd->rate = _floppy->rate & 0x43; 2156 raw_cmd->cmd_count = NR_F; 2157 raw_cmd->cmd[COMMAND] = FM_MODE(_floppy, FD_FORMAT); 2158 raw_cmd->cmd[DR_SELECT] = UNIT(current_drive) + PH_HEAD(_floppy, format_req.head); 2159 raw_cmd->cmd[F_SIZECODE] = FD_SIZECODE(_floppy); 2160 raw_cmd->cmd[F_SECT_PER_TRACK] = _floppy->sect << 2 >> raw_cmd->cmd[F_SIZECODE]; 2161 raw_cmd->cmd[F_GAP] = _floppy->fmt_gap; 2162 raw_cmd->cmd[F_FILL] = FD_FILL_BYTE; 2163 2164 raw_cmd->kernel_data = floppy_track_buffer; 2165 raw_cmd->length = 4 * raw_cmd->cmd[F_SECT_PER_TRACK]; 2166 2167 if (!raw_cmd->cmd[F_SECT_PER_TRACK]) 2168 return; 2169 2170 /* allow for about 30ms for data transport per track */ 2171 head_shift = (raw_cmd->cmd[F_SECT_PER_TRACK] + 5) / 6; 2172 2173 /* a ``cylinder'' is two tracks plus a little stepping time */ 2174 track_shift = 2 * head_shift + 3; 2175 2176 /* position of logical sector 1 on this track */ 2177 n = (track_shift * format_req.track + head_shift * format_req.head) 2178 % raw_cmd->cmd[F_SECT_PER_TRACK]; 2179 2180 /* determine interleave */ 2181 il = 1; 2182 if (_floppy->fmt_gap < 0x22) 2183 il++; 2184 2185 /* initialize field */ 2186 for (count = 0; count < raw_cmd->cmd[F_SECT_PER_TRACK]; ++count) { 2187 here[count].track = format_req.track; 2188 here[count].head = format_req.head; 2189 here[count].sect = 0; 2190 here[count].size = raw_cmd->cmd[F_SIZECODE]; 2191 } 2192 /* place logical sectors */ 2193 for (count = 1; count <= raw_cmd->cmd[F_SECT_PER_TRACK]; ++count) { 2194 here[n].sect = count; 2195 n = (n + il) % raw_cmd->cmd[F_SECT_PER_TRACK]; 2196 if (here[n].sect) { /* sector busy, find next free sector */ 2197 ++n; 2198 if (n >= raw_cmd->cmd[F_SECT_PER_TRACK]) { 2199 n -= raw_cmd->cmd[F_SECT_PER_TRACK]; 2200 while (here[n].sect) 2201 ++n; 2202 } 2203 } 2204 } 2205 if (_floppy->stretch & FD_SECTBASEMASK) { 2206 for (count = 0; count < raw_cmd->cmd[F_SECT_PER_TRACK]; count++) 2207 here[count].sect += FD_SECTBASE(_floppy) - 1; 2208 } 2209 } 2210 2211 static void redo_format(void) 2212 { 2213 buffer_track = -1; 2214 setup_format_params(format_req.track << STRETCH(_floppy)); 2215 floppy_start(); 2216 debugt(__func__, "queue format request"); 2217 } 2218 2219 static const struct cont_t format_cont = { 2220 .interrupt = format_interrupt, 2221 .redo = redo_format, 2222 .error = bad_flp_intr, 2223 .done = generic_done 2224 }; 2225 2226 static int do_format(int drive, struct format_descr *tmp_format_req) 2227 { 2228 int ret; 2229 2230 if (lock_fdc(drive)) 2231 return -EINTR; 2232 2233 set_floppy(drive); 2234 if (!_floppy || 2235 _floppy->track > drive_params[current_drive].tracks || 2236 tmp_format_req->track >= _floppy->track || 2237 tmp_format_req->head >= _floppy->head || 2238 (_floppy->sect << 2) % (1 << FD_SIZECODE(_floppy)) || 2239 !_floppy->fmt_gap) { 2240 process_fd_request(); 2241 return -EINVAL; 2242 } 2243 format_req = *tmp_format_req; 2244 format_errors = 0; 2245 cont = &format_cont; 2246 errors = &format_errors; 2247 ret = wait_til_done(redo_format, true); 2248 if (ret == -EINTR) 2249 return -EINTR; 2250 process_fd_request(); 2251 return ret; 2252 } 2253 2254 /* 2255 * Buffer read/write and support 2256 * ============================= 2257 */ 2258 2259 static void floppy_end_request(struct request *req, blk_status_t error) 2260 { 2261 unsigned int nr_sectors = current_count_sectors; 2262 unsigned int drive = (unsigned long)req->q->disk->private_data; 2263 2264 /* current_count_sectors can be zero if transfer failed */ 2265 if (error) 2266 nr_sectors = blk_rq_cur_sectors(req); 2267 if (blk_update_request(req, error, nr_sectors << 9)) 2268 return; 2269 __blk_mq_end_request(req, error); 2270 2271 /* We're done with the request */ 2272 floppy_off(drive); 2273 current_req = NULL; 2274 } 2275 2276 /* new request_done. Can handle physical sectors which are smaller than a 2277 * logical buffer */ 2278 static void request_done(int uptodate) 2279 { 2280 struct request *req = current_req; 2281 int block; 2282 char msg[sizeof("request done ") + sizeof(int) * 3]; 2283 2284 probing = 0; 2285 snprintf(msg, sizeof(msg), "request done %d", uptodate); 2286 reschedule_timeout(MAXTIMEOUT, msg); 2287 2288 if (!req) { 2289 pr_info("floppy.c: no request in request_done\n"); 2290 return; 2291 } 2292 2293 if (uptodate) { 2294 /* maintain values for invalidation on geometry 2295 * change */ 2296 block = current_count_sectors + blk_rq_pos(req); 2297 INFBOUND(drive_state[current_drive].maxblock, block); 2298 if (block > _floppy->sect) 2299 drive_state[current_drive].maxtrack = 1; 2300 2301 floppy_end_request(req, 0); 2302 } else { 2303 if (rq_data_dir(req) == WRITE) { 2304 /* record write error information */ 2305 write_errors[current_drive].write_errors++; 2306 if (write_errors[current_drive].write_errors == 1) { 2307 write_errors[current_drive].first_error_sector = blk_rq_pos(req); 2308 write_errors[current_drive].first_error_generation = drive_state[current_drive].generation; 2309 } 2310 write_errors[current_drive].last_error_sector = blk_rq_pos(req); 2311 write_errors[current_drive].last_error_generation = drive_state[current_drive].generation; 2312 } 2313 floppy_end_request(req, BLK_STS_IOERR); 2314 } 2315 } 2316 2317 /* Interrupt handler evaluating the result of the r/w operation */ 2318 static void rw_interrupt(void) 2319 { 2320 int eoc; 2321 int ssize; 2322 int heads; 2323 int nr_sectors; 2324 2325 if (reply_buffer[R_HEAD] >= 2) { 2326 /* some Toshiba floppy controllers occasionnally seem to 2327 * return bogus interrupts after read/write operations, which 2328 * can be recognized by a bad head number (>= 2) */ 2329 return; 2330 } 2331 2332 if (!drive_state[current_drive].first_read_date) 2333 drive_state[current_drive].first_read_date = jiffies; 2334 2335 ssize = DIV_ROUND_UP(1 << raw_cmd->cmd[SIZECODE], 4); 2336 2337 if (reply_buffer[ST1] & ST1_EOC) 2338 eoc = 1; 2339 else 2340 eoc = 0; 2341 2342 if (raw_cmd->cmd[COMMAND] & 0x80) 2343 heads = 2; 2344 else 2345 heads = 1; 2346 2347 nr_sectors = (((reply_buffer[R_TRACK] - raw_cmd->cmd[TRACK]) * heads + 2348 reply_buffer[R_HEAD] - raw_cmd->cmd[HEAD]) * raw_cmd->cmd[SECT_PER_TRACK] + 2349 reply_buffer[R_SECTOR] - raw_cmd->cmd[SECTOR] + eoc) << raw_cmd->cmd[SIZECODE] >> 2; 2350 2351 if (nr_sectors / ssize > 2352 DIV_ROUND_UP(in_sector_offset + current_count_sectors, ssize)) { 2353 DPRINT("long rw: %x instead of %lx\n", 2354 nr_sectors, current_count_sectors); 2355 pr_info("rs=%d s=%d\n", reply_buffer[R_SECTOR], 2356 raw_cmd->cmd[SECTOR]); 2357 pr_info("rh=%d h=%d\n", reply_buffer[R_HEAD], 2358 raw_cmd->cmd[HEAD]); 2359 pr_info("rt=%d t=%d\n", reply_buffer[R_TRACK], 2360 raw_cmd->cmd[TRACK]); 2361 pr_info("heads=%d eoc=%d\n", heads, eoc); 2362 pr_info("spt=%d st=%d ss=%d\n", 2363 raw_cmd->cmd[SECT_PER_TRACK], fsector_t, ssize); 2364 pr_info("in_sector_offset=%d\n", in_sector_offset); 2365 } 2366 2367 nr_sectors -= in_sector_offset; 2368 INFBOUND(nr_sectors, 0); 2369 SUPBOUND(current_count_sectors, nr_sectors); 2370 2371 switch (interpret_errors()) { 2372 case 2: 2373 cont->redo(); 2374 return; 2375 case 1: 2376 if (!current_count_sectors) { 2377 cont->error(); 2378 cont->redo(); 2379 return; 2380 } 2381 break; 2382 case 0: 2383 if (!current_count_sectors) { 2384 cont->redo(); 2385 return; 2386 } 2387 current_type[current_drive] = _floppy; 2388 floppy_sizes[TOMINOR(current_drive)] = _floppy->size; 2389 break; 2390 } 2391 2392 if (probing) { 2393 if (drive_params[current_drive].flags & FTD_MSG) 2394 DPRINT("Auto-detected floppy type %s in fd%d\n", 2395 _floppy->name, current_drive); 2396 current_type[current_drive] = _floppy; 2397 floppy_sizes[TOMINOR(current_drive)] = _floppy->size; 2398 probing = 0; 2399 } 2400 2401 if (CT(raw_cmd->cmd[COMMAND]) != FD_READ) { 2402 /* transfer directly from buffer */ 2403 cont->done(1); 2404 } else { 2405 buffer_track = raw_cmd->track; 2406 buffer_drive = current_drive; 2407 INFBOUND(buffer_max, nr_sectors + fsector_t); 2408 } 2409 cont->redo(); 2410 } 2411 2412 /* Compute the maximal transfer size */ 2413 static int transfer_size(int ssize, int max_sector, int max_size) 2414 { 2415 SUPBOUND(max_sector, fsector_t + max_size); 2416 2417 /* alignment */ 2418 max_sector -= (max_sector % _floppy->sect) % ssize; 2419 2420 /* transfer size, beginning not aligned */ 2421 current_count_sectors = max_sector - fsector_t; 2422 2423 return max_sector; 2424 } 2425 2426 /* 2427 * Move data from/to the track buffer to/from the buffer cache. 2428 */ 2429 static void copy_buffer(int ssize, int max_sector, int max_sector_2) 2430 { 2431 int remaining; /* number of transferred 512-byte sectors */ 2432 struct bio_vec bv; 2433 char *dma_buffer; 2434 int size; 2435 struct req_iterator iter; 2436 2437 max_sector = transfer_size(ssize, 2438 min(max_sector, max_sector_2), 2439 blk_rq_sectors(current_req)); 2440 2441 if (current_count_sectors <= 0 && CT(raw_cmd->cmd[COMMAND]) == FD_WRITE && 2442 buffer_max > fsector_t + blk_rq_sectors(current_req)) 2443 current_count_sectors = min_t(int, buffer_max - fsector_t, 2444 blk_rq_sectors(current_req)); 2445 2446 remaining = current_count_sectors << 9; 2447 if (remaining > blk_rq_bytes(current_req) && CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) { 2448 DPRINT("in copy buffer\n"); 2449 pr_info("current_count_sectors=%ld\n", current_count_sectors); 2450 pr_info("remaining=%d\n", remaining >> 9); 2451 pr_info("current_req->nr_sectors=%u\n", 2452 blk_rq_sectors(current_req)); 2453 pr_info("current_req->current_nr_sectors=%u\n", 2454 blk_rq_cur_sectors(current_req)); 2455 pr_info("max_sector=%d\n", max_sector); 2456 pr_info("ssize=%d\n", ssize); 2457 } 2458 2459 buffer_max = max(max_sector, buffer_max); 2460 2461 dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9); 2462 2463 size = blk_rq_cur_bytes(current_req); 2464 2465 rq_for_each_segment(bv, current_req, iter) { 2466 if (!remaining) 2467 break; 2468 2469 size = bv.bv_len; 2470 SUPBOUND(size, remaining); 2471 if (dma_buffer + size > 2472 floppy_track_buffer + (max_buffer_sectors << 10) || 2473 dma_buffer < floppy_track_buffer) { 2474 DPRINT("buffer overrun in copy buffer %d\n", 2475 (int)((floppy_track_buffer - dma_buffer) >> 9)); 2476 pr_info("fsector_t=%d buffer_min=%d\n", 2477 fsector_t, buffer_min); 2478 pr_info("current_count_sectors=%ld\n", 2479 current_count_sectors); 2480 if (CT(raw_cmd->cmd[COMMAND]) == FD_READ) 2481 pr_info("read\n"); 2482 if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) 2483 pr_info("write\n"); 2484 break; 2485 } 2486 2487 if (CT(raw_cmd->cmd[COMMAND]) == FD_READ) 2488 memcpy_to_page(bv.bv_page, bv.bv_offset, dma_buffer, 2489 size); 2490 else 2491 memcpy_from_page(dma_buffer, bv.bv_page, bv.bv_offset, 2492 size); 2493 2494 remaining -= size; 2495 dma_buffer += size; 2496 } 2497 if (remaining) { 2498 if (remaining > 0) 2499 max_sector -= remaining >> 9; 2500 DPRINT("weirdness: remaining %d\n", remaining >> 9); 2501 } 2502 } 2503 2504 /* work around a bug in pseudo DMA 2505 * (on some FDCs) pseudo DMA does not stop when the CPU stops 2506 * sending data. Hence we need a different way to signal the 2507 * transfer length: We use raw_cmd->cmd[SECT_PER_TRACK]. Unfortunately, this 2508 * does not work with MT, hence we can only transfer one head at 2509 * a time 2510 */ 2511 static void virtualdmabug_workaround(void) 2512 { 2513 int hard_sectors; 2514 int end_sector; 2515 2516 if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) { 2517 raw_cmd->cmd[COMMAND] &= ~0x80; /* switch off multiple track mode */ 2518 2519 hard_sectors = raw_cmd->length >> (7 + raw_cmd->cmd[SIZECODE]); 2520 end_sector = raw_cmd->cmd[SECTOR] + hard_sectors - 1; 2521 if (end_sector > raw_cmd->cmd[SECT_PER_TRACK]) { 2522 pr_info("too many sectors %d > %d\n", 2523 end_sector, raw_cmd->cmd[SECT_PER_TRACK]); 2524 return; 2525 } 2526 raw_cmd->cmd[SECT_PER_TRACK] = end_sector; 2527 /* make sure raw_cmd->cmd[SECT_PER_TRACK] 2528 * points to end of transfer */ 2529 } 2530 } 2531 2532 /* 2533 * Formulate a read/write request. 2534 * this routine decides where to load the data (directly to buffer, or to 2535 * tmp floppy area), how much data to load (the size of the buffer, the whole 2536 * track, or a single sector) 2537 * All floppy_track_buffer handling goes in here. If we ever add track buffer 2538 * allocation on the fly, it should be done here. No other part should need 2539 * modification. 2540 */ 2541 2542 static int make_raw_rw_request(void) 2543 { 2544 int aligned_sector_t; 2545 int max_sector; 2546 int max_size; 2547 int tracksize; 2548 int ssize; 2549 2550 if (WARN(max_buffer_sectors == 0, "VFS: Block I/O scheduled on unopened device\n")) 2551 return 0; 2552 2553 set_fdc((long)current_req->q->disk->private_data); 2554 2555 raw_cmd = &default_raw_cmd; 2556 raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK; 2557 raw_cmd->cmd_count = NR_RW; 2558 if (rq_data_dir(current_req) == READ) { 2559 raw_cmd->flags |= FD_RAW_READ; 2560 raw_cmd->cmd[COMMAND] = FM_MODE(_floppy, FD_READ); 2561 } else if (rq_data_dir(current_req) == WRITE) { 2562 raw_cmd->flags |= FD_RAW_WRITE; 2563 raw_cmd->cmd[COMMAND] = FM_MODE(_floppy, FD_WRITE); 2564 } else { 2565 DPRINT("%s: unknown command\n", __func__); 2566 return 0; 2567 } 2568 2569 max_sector = _floppy->sect * _floppy->head; 2570 2571 raw_cmd->cmd[TRACK] = (int)blk_rq_pos(current_req) / max_sector; 2572 fsector_t = (int)blk_rq_pos(current_req) % max_sector; 2573 if (_floppy->track && raw_cmd->cmd[TRACK] >= _floppy->track) { 2574 if (blk_rq_cur_sectors(current_req) & 1) { 2575 current_count_sectors = 1; 2576 return 1; 2577 } else 2578 return 0; 2579 } 2580 raw_cmd->cmd[HEAD] = fsector_t / _floppy->sect; 2581 2582 if (((_floppy->stretch & (FD_SWAPSIDES | FD_SECTBASEMASK)) || 2583 test_bit(FD_NEED_TWADDLE_BIT, &drive_state[current_drive].flags)) && 2584 fsector_t < _floppy->sect) 2585 max_sector = _floppy->sect; 2586 2587 /* 2M disks have phantom sectors on the first track */ 2588 if ((_floppy->rate & FD_2M) && (!raw_cmd->cmd[TRACK]) && (!raw_cmd->cmd[HEAD])) { 2589 max_sector = 2 * _floppy->sect / 3; 2590 if (fsector_t >= max_sector) { 2591 current_count_sectors = 2592 min_t(int, _floppy->sect - fsector_t, 2593 blk_rq_sectors(current_req)); 2594 return 1; 2595 } 2596 raw_cmd->cmd[SIZECODE] = 2; 2597 } else 2598 raw_cmd->cmd[SIZECODE] = FD_SIZECODE(_floppy); 2599 raw_cmd->rate = _floppy->rate & 0x43; 2600 if ((_floppy->rate & FD_2M) && 2601 (raw_cmd->cmd[TRACK] || raw_cmd->cmd[HEAD]) && raw_cmd->rate == 2) 2602 raw_cmd->rate = 1; 2603 2604 if (raw_cmd->cmd[SIZECODE]) 2605 raw_cmd->cmd[SIZECODE2] = 0xff; 2606 else 2607 raw_cmd->cmd[SIZECODE2] = 0x80; 2608 raw_cmd->track = raw_cmd->cmd[TRACK] << STRETCH(_floppy); 2609 raw_cmd->cmd[DR_SELECT] = UNIT(current_drive) + PH_HEAD(_floppy, raw_cmd->cmd[HEAD]); 2610 raw_cmd->cmd[GAP] = _floppy->gap; 2611 ssize = DIV_ROUND_UP(1 << raw_cmd->cmd[SIZECODE], 4); 2612 raw_cmd->cmd[SECT_PER_TRACK] = _floppy->sect << 2 >> raw_cmd->cmd[SIZECODE]; 2613 raw_cmd->cmd[SECTOR] = ((fsector_t % _floppy->sect) << 2 >> raw_cmd->cmd[SIZECODE]) + 2614 FD_SECTBASE(_floppy); 2615 2616 /* tracksize describes the size which can be filled up with sectors 2617 * of size ssize. 2618 */ 2619 tracksize = _floppy->sect - _floppy->sect % ssize; 2620 if (tracksize < _floppy->sect) { 2621 raw_cmd->cmd[SECT_PER_TRACK]++; 2622 if (tracksize <= fsector_t % _floppy->sect) 2623 raw_cmd->cmd[SECTOR]--; 2624 2625 /* if we are beyond tracksize, fill up using smaller sectors */ 2626 while (tracksize <= fsector_t % _floppy->sect) { 2627 while (tracksize + ssize > _floppy->sect) { 2628 raw_cmd->cmd[SIZECODE]--; 2629 ssize >>= 1; 2630 } 2631 raw_cmd->cmd[SECTOR]++; 2632 raw_cmd->cmd[SECT_PER_TRACK]++; 2633 tracksize += ssize; 2634 } 2635 max_sector = raw_cmd->cmd[HEAD] * _floppy->sect + tracksize; 2636 } else if (!raw_cmd->cmd[TRACK] && !raw_cmd->cmd[HEAD] && !(_floppy->rate & FD_2M) && probing) { 2637 max_sector = _floppy->sect; 2638 } else if (!raw_cmd->cmd[HEAD] && CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) { 2639 /* for virtual DMA bug workaround */ 2640 max_sector = _floppy->sect; 2641 } 2642 2643 in_sector_offset = (fsector_t % _floppy->sect) % ssize; 2644 aligned_sector_t = fsector_t - in_sector_offset; 2645 max_size = blk_rq_sectors(current_req); 2646 if ((raw_cmd->track == buffer_track) && 2647 (current_drive == buffer_drive) && 2648 (fsector_t >= buffer_min) && (fsector_t < buffer_max)) { 2649 /* data already in track buffer */ 2650 if (CT(raw_cmd->cmd[COMMAND]) == FD_READ) { 2651 copy_buffer(1, max_sector, buffer_max); 2652 return 1; 2653 } 2654 } else if (in_sector_offset || blk_rq_sectors(current_req) < ssize) { 2655 if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) { 2656 unsigned int sectors; 2657 2658 sectors = fsector_t + blk_rq_sectors(current_req); 2659 if (sectors > ssize && sectors < ssize + ssize) 2660 max_size = ssize + ssize; 2661 else 2662 max_size = ssize; 2663 } 2664 raw_cmd->flags &= ~FD_RAW_WRITE; 2665 raw_cmd->flags |= FD_RAW_READ; 2666 raw_cmd->cmd[COMMAND] = FM_MODE(_floppy, FD_READ); 2667 } 2668 2669 if (CT(raw_cmd->cmd[COMMAND]) == FD_READ) 2670 max_size = max_sector; /* unbounded */ 2671 2672 /* claim buffer track if needed */ 2673 if (buffer_track != raw_cmd->track || /* bad track */ 2674 buffer_drive != current_drive || /* bad drive */ 2675 fsector_t > buffer_max || 2676 fsector_t < buffer_min || 2677 ((CT(raw_cmd->cmd[COMMAND]) == FD_READ || 2678 (!in_sector_offset && blk_rq_sectors(current_req) >= ssize)) && 2679 max_sector > 2 * max_buffer_sectors + buffer_min && 2680 max_size + fsector_t > 2 * max_buffer_sectors + buffer_min)) { 2681 /* not enough space */ 2682 buffer_track = -1; 2683 buffer_drive = current_drive; 2684 buffer_max = buffer_min = aligned_sector_t; 2685 } 2686 raw_cmd->kernel_data = floppy_track_buffer + 2687 ((aligned_sector_t - buffer_min) << 9); 2688 2689 if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) { 2690 /* copy write buffer to track buffer. 2691 * if we get here, we know that the write 2692 * is either aligned or the data already in the buffer 2693 * (buffer will be overwritten) */ 2694 if (in_sector_offset && buffer_track == -1) 2695 DPRINT("internal error offset !=0 on write\n"); 2696 buffer_track = raw_cmd->track; 2697 buffer_drive = current_drive; 2698 copy_buffer(ssize, max_sector, 2699 2 * max_buffer_sectors + buffer_min); 2700 } else 2701 transfer_size(ssize, max_sector, 2702 2 * max_buffer_sectors + buffer_min - 2703 aligned_sector_t); 2704 2705 /* round up current_count_sectors to get dma xfer size */ 2706 raw_cmd->length = in_sector_offset + current_count_sectors; 2707 raw_cmd->length = ((raw_cmd->length - 1) | (ssize - 1)) + 1; 2708 raw_cmd->length <<= 9; 2709 if ((raw_cmd->length < current_count_sectors << 9) || 2710 (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE && 2711 (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max || 2712 aligned_sector_t < buffer_min)) || 2713 raw_cmd->length % (128 << raw_cmd->cmd[SIZECODE]) || 2714 raw_cmd->length <= 0 || current_count_sectors <= 0) { 2715 DPRINT("fractionary current count b=%lx s=%lx\n", 2716 raw_cmd->length, current_count_sectors); 2717 pr_info("addr=%d, length=%ld\n", 2718 (int)((raw_cmd->kernel_data - 2719 floppy_track_buffer) >> 9), 2720 current_count_sectors); 2721 pr_info("st=%d ast=%d mse=%d msi=%d\n", 2722 fsector_t, aligned_sector_t, max_sector, max_size); 2723 pr_info("ssize=%x SIZECODE=%d\n", ssize, raw_cmd->cmd[SIZECODE]); 2724 pr_info("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n", 2725 raw_cmd->cmd[COMMAND], raw_cmd->cmd[SECTOR], 2726 raw_cmd->cmd[HEAD], raw_cmd->cmd[TRACK]); 2727 pr_info("buffer drive=%d\n", buffer_drive); 2728 pr_info("buffer track=%d\n", buffer_track); 2729 pr_info("buffer_min=%d\n", buffer_min); 2730 pr_info("buffer_max=%d\n", buffer_max); 2731 return 0; 2732 } 2733 2734 if (raw_cmd->kernel_data < floppy_track_buffer || 2735 current_count_sectors < 0 || 2736 raw_cmd->length < 0 || 2737 raw_cmd->kernel_data + raw_cmd->length > 2738 floppy_track_buffer + (max_buffer_sectors << 10)) { 2739 DPRINT("buffer overrun in schedule dma\n"); 2740 pr_info("fsector_t=%d buffer_min=%d current_count=%ld\n", 2741 fsector_t, buffer_min, raw_cmd->length >> 9); 2742 pr_info("current_count_sectors=%ld\n", 2743 current_count_sectors); 2744 if (CT(raw_cmd->cmd[COMMAND]) == FD_READ) 2745 pr_info("read\n"); 2746 if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) 2747 pr_info("write\n"); 2748 return 0; 2749 } 2750 if (raw_cmd->length == 0) { 2751 DPRINT("zero dma transfer attempted from make_raw_request\n"); 2752 return 0; 2753 } 2754 2755 virtualdmabug_workaround(); 2756 return 2; 2757 } 2758 2759 static int set_next_request(void) 2760 { 2761 current_req = list_first_entry_or_null(&floppy_reqs, struct request, 2762 queuelist); 2763 if (current_req) { 2764 current_req->error_count = 0; 2765 list_del_init(¤t_req->queuelist); 2766 } 2767 return current_req != NULL; 2768 } 2769 2770 /* Starts or continues processing request. Will automatically unlock the 2771 * driver at end of request. 2772 */ 2773 static void redo_fd_request(void) 2774 { 2775 int drive; 2776 int tmp; 2777 2778 lastredo = jiffies; 2779 if (current_drive < N_DRIVE) 2780 floppy_off(current_drive); 2781 2782 do_request: 2783 if (!current_req) { 2784 int pending; 2785 2786 spin_lock_irq(&floppy_lock); 2787 pending = set_next_request(); 2788 spin_unlock_irq(&floppy_lock); 2789 if (!pending) { 2790 do_floppy = NULL; 2791 unlock_fdc(); 2792 return; 2793 } 2794 } 2795 drive = (long)current_req->q->disk->private_data; 2796 set_fdc(drive); 2797 reschedule_timeout(current_drive, "redo fd request"); 2798 2799 set_floppy(drive); 2800 raw_cmd = &default_raw_cmd; 2801 raw_cmd->flags = 0; 2802 if (start_motor(redo_fd_request)) 2803 return; 2804 2805 disk_change(current_drive); 2806 if (test_bit(current_drive, &fake_change) || 2807 test_bit(FD_DISK_CHANGED_BIT, &drive_state[current_drive].flags)) { 2808 DPRINT("disk absent or changed during operation\n"); 2809 request_done(0); 2810 goto do_request; 2811 } 2812 if (!_floppy) { /* Autodetection */ 2813 if (!probing) { 2814 drive_state[current_drive].probed_format = 0; 2815 if (next_valid_format(current_drive)) { 2816 DPRINT("no autodetectable formats\n"); 2817 _floppy = NULL; 2818 request_done(0); 2819 goto do_request; 2820 } 2821 } 2822 probing = 1; 2823 _floppy = floppy_type + drive_params[current_drive].autodetect[drive_state[current_drive].probed_format]; 2824 } else 2825 probing = 0; 2826 errors = &(current_req->error_count); 2827 tmp = make_raw_rw_request(); 2828 if (tmp < 2) { 2829 request_done(tmp); 2830 goto do_request; 2831 } 2832 2833 if (test_bit(FD_NEED_TWADDLE_BIT, &drive_state[current_drive].flags)) 2834 twaddle(current_fdc, current_drive); 2835 schedule_bh(floppy_start); 2836 debugt(__func__, "queue fd request"); 2837 return; 2838 } 2839 2840 static const struct cont_t rw_cont = { 2841 .interrupt = rw_interrupt, 2842 .redo = redo_fd_request, 2843 .error = bad_flp_intr, 2844 .done = request_done 2845 }; 2846 2847 /* schedule the request and automatically unlock the driver on completion */ 2848 static void process_fd_request(void) 2849 { 2850 cont = &rw_cont; 2851 schedule_bh(redo_fd_request); 2852 } 2853 2854 static blk_status_t floppy_queue_rq(struct blk_mq_hw_ctx *hctx, 2855 const struct blk_mq_queue_data *bd) 2856 { 2857 blk_mq_start_request(bd->rq); 2858 2859 if (WARN(max_buffer_sectors == 0, 2860 "VFS: %s called on non-open device\n", __func__)) 2861 return BLK_STS_IOERR; 2862 2863 if (WARN(atomic_read(&usage_count) == 0, 2864 "warning: usage count=0, current_req=%p sect=%ld flags=%llx\n", 2865 current_req, (long)blk_rq_pos(current_req), 2866 (unsigned long long) current_req->cmd_flags)) 2867 return BLK_STS_IOERR; 2868 2869 if (test_and_set_bit(0, &fdc_busy)) { 2870 /* fdc busy, this new request will be treated when the 2871 current one is done */ 2872 is_alive(__func__, "old request running"); 2873 return BLK_STS_RESOURCE; 2874 } 2875 2876 spin_lock_irq(&floppy_lock); 2877 list_add_tail(&bd->rq->queuelist, &floppy_reqs); 2878 spin_unlock_irq(&floppy_lock); 2879 2880 command_status = FD_COMMAND_NONE; 2881 __reschedule_timeout(MAXTIMEOUT, "fd_request"); 2882 set_fdc(0); 2883 process_fd_request(); 2884 is_alive(__func__, ""); 2885 return BLK_STS_OK; 2886 } 2887 2888 static const struct cont_t poll_cont = { 2889 .interrupt = success_and_wakeup, 2890 .redo = floppy_ready, 2891 .error = generic_failure, 2892 .done = generic_done 2893 }; 2894 2895 static int poll_drive(bool interruptible, int flag) 2896 { 2897 /* no auto-sense, just clear dcl */ 2898 raw_cmd = &default_raw_cmd; 2899 raw_cmd->flags = flag; 2900 raw_cmd->track = 0; 2901 raw_cmd->cmd_count = 0; 2902 cont = &poll_cont; 2903 debug_dcl(drive_params[current_drive].flags, 2904 "setting NEWCHANGE in poll_drive\n"); 2905 set_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[current_drive].flags); 2906 2907 return wait_til_done(floppy_ready, interruptible); 2908 } 2909 2910 /* 2911 * User triggered reset 2912 * ==================== 2913 */ 2914 2915 static void reset_intr(void) 2916 { 2917 pr_info("weird, reset interrupt called\n"); 2918 } 2919 2920 static const struct cont_t reset_cont = { 2921 .interrupt = reset_intr, 2922 .redo = success_and_wakeup, 2923 .error = generic_failure, 2924 .done = generic_done 2925 }; 2926 2927 /* 2928 * Resets the FDC connected to drive <drive>. 2929 * Both current_drive and current_fdc are changed to match the new drive. 2930 */ 2931 static int user_reset_fdc(int drive, int arg, bool interruptible) 2932 { 2933 int ret; 2934 2935 if (lock_fdc(drive)) 2936 return -EINTR; 2937 2938 if (arg == FD_RESET_ALWAYS) 2939 fdc_state[current_fdc].reset = 1; 2940 if (fdc_state[current_fdc].reset) { 2941 /* note: reset_fdc will take care of unlocking the driver 2942 * on completion. 2943 */ 2944 cont = &reset_cont; 2945 ret = wait_til_done(reset_fdc, interruptible); 2946 if (ret == -EINTR) 2947 return -EINTR; 2948 } 2949 process_fd_request(); 2950 return 0; 2951 } 2952 2953 /* 2954 * Misc Ioctl's and support 2955 * ======================== 2956 */ 2957 static inline int fd_copyout(void __user *param, const void *address, 2958 unsigned long size) 2959 { 2960 return copy_to_user(param, address, size) ? -EFAULT : 0; 2961 } 2962 2963 static inline int fd_copyin(void __user *param, void *address, 2964 unsigned long size) 2965 { 2966 return copy_from_user(address, param, size) ? -EFAULT : 0; 2967 } 2968 2969 static const char *drive_name(int type, int drive) 2970 { 2971 struct floppy_struct *floppy; 2972 2973 if (type) 2974 floppy = floppy_type + type; 2975 else { 2976 if (drive_params[drive].native_format) 2977 floppy = floppy_type + drive_params[drive].native_format; 2978 else 2979 return "(null)"; 2980 } 2981 if (floppy->name) 2982 return floppy->name; 2983 else 2984 return "(null)"; 2985 } 2986 2987 /* raw commands */ 2988 static void raw_cmd_done(int flag) 2989 { 2990 if (!flag) { 2991 raw_cmd->flags |= FD_RAW_FAILURE; 2992 raw_cmd->flags |= FD_RAW_HARDFAILURE; 2993 } else { 2994 raw_cmd->reply_count = inr; 2995 if (raw_cmd->reply_count > FD_RAW_REPLY_SIZE) 2996 raw_cmd->reply_count = 0; 2997 memcpy(raw_cmd->reply, reply_buffer, raw_cmd->reply_count); 2998 2999 if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE)) { 3000 unsigned long flags; 3001 flags = claim_dma_lock(); 3002 raw_cmd->length = fd_get_dma_residue(); 3003 release_dma_lock(flags); 3004 } 3005 3006 if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) && 3007 (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0))) 3008 raw_cmd->flags |= FD_RAW_FAILURE; 3009 3010 if (disk_change(current_drive)) 3011 raw_cmd->flags |= FD_RAW_DISK_CHANGE; 3012 else 3013 raw_cmd->flags &= ~FD_RAW_DISK_CHANGE; 3014 if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER) 3015 motor_off_callback(&motor_off_timer[current_drive]); 3016 3017 if (raw_cmd->next && 3018 (!(raw_cmd->flags & FD_RAW_FAILURE) || 3019 !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) && 3020 ((raw_cmd->flags & FD_RAW_FAILURE) || 3021 !(raw_cmd->flags & FD_RAW_STOP_IF_SUCCESS))) { 3022 raw_cmd = raw_cmd->next; 3023 return; 3024 } 3025 } 3026 generic_done(flag); 3027 } 3028 3029 static const struct cont_t raw_cmd_cont = { 3030 .interrupt = success_and_wakeup, 3031 .redo = floppy_start, 3032 .error = generic_failure, 3033 .done = raw_cmd_done 3034 }; 3035 3036 static int raw_cmd_copyout(int cmd, void __user *param, 3037 struct floppy_raw_cmd *ptr) 3038 { 3039 int ret; 3040 3041 while (ptr) { 3042 struct floppy_raw_cmd cmd = *ptr; 3043 cmd.next = NULL; 3044 cmd.kernel_data = NULL; 3045 ret = copy_to_user(param, &cmd, sizeof(cmd)); 3046 if (ret) 3047 return -EFAULT; 3048 param += sizeof(struct floppy_raw_cmd); 3049 if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) { 3050 if (ptr->length >= 0 && 3051 ptr->length <= ptr->buffer_length) { 3052 long length = ptr->buffer_length - ptr->length; 3053 ret = fd_copyout(ptr->data, ptr->kernel_data, 3054 length); 3055 if (ret) 3056 return ret; 3057 } 3058 } 3059 ptr = ptr->next; 3060 } 3061 3062 return 0; 3063 } 3064 3065 static void raw_cmd_free(struct floppy_raw_cmd **ptr) 3066 { 3067 struct floppy_raw_cmd *next; 3068 struct floppy_raw_cmd *this; 3069 3070 this = *ptr; 3071 *ptr = NULL; 3072 while (this) { 3073 if (this->buffer_length) { 3074 fd_dma_mem_free((unsigned long)this->kernel_data, 3075 this->buffer_length); 3076 this->buffer_length = 0; 3077 } 3078 next = this->next; 3079 kfree(this); 3080 this = next; 3081 } 3082 } 3083 3084 #define MAX_LEN (1UL << MAX_ORDER << PAGE_SHIFT) 3085 3086 static int raw_cmd_copyin(int cmd, void __user *param, 3087 struct floppy_raw_cmd **rcmd) 3088 { 3089 struct floppy_raw_cmd *ptr; 3090 int ret; 3091 3092 *rcmd = NULL; 3093 3094 loop: 3095 ptr = kmalloc(sizeof(struct floppy_raw_cmd), GFP_KERNEL); 3096 if (!ptr) 3097 return -ENOMEM; 3098 *rcmd = ptr; 3099 ret = copy_from_user(ptr, param, sizeof(*ptr)); 3100 ptr->next = NULL; 3101 ptr->buffer_length = 0; 3102 ptr->kernel_data = NULL; 3103 if (ret) 3104 return -EFAULT; 3105 param += sizeof(struct floppy_raw_cmd); 3106 if (ptr->cmd_count > FD_RAW_CMD_FULLSIZE) 3107 return -EINVAL; 3108 3109 memset(ptr->reply, 0, FD_RAW_REPLY_SIZE); 3110 ptr->resultcode = 0; 3111 3112 if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) { 3113 if (ptr->length <= 0 || ptr->length >= MAX_LEN) 3114 return -EINVAL; 3115 ptr->kernel_data = (char *)fd_dma_mem_alloc(ptr->length); 3116 fallback_on_nodma_alloc(&ptr->kernel_data, ptr->length); 3117 if (!ptr->kernel_data) 3118 return -ENOMEM; 3119 ptr->buffer_length = ptr->length; 3120 } 3121 if (ptr->flags & FD_RAW_WRITE) { 3122 ret = fd_copyin(ptr->data, ptr->kernel_data, ptr->length); 3123 if (ret) 3124 return ret; 3125 } 3126 3127 if (ptr->flags & FD_RAW_MORE) { 3128 rcmd = &(ptr->next); 3129 ptr->rate &= 0x43; 3130 goto loop; 3131 } 3132 3133 return 0; 3134 } 3135 3136 static int raw_cmd_ioctl(int cmd, void __user *param) 3137 { 3138 struct floppy_raw_cmd *my_raw_cmd; 3139 int drive; 3140 int ret2; 3141 int ret; 3142 3143 if (fdc_state[current_fdc].rawcmd <= 1) 3144 fdc_state[current_fdc].rawcmd = 1; 3145 for (drive = 0; drive < N_DRIVE; drive++) { 3146 if (FDC(drive) != current_fdc) 3147 continue; 3148 if (drive == current_drive) { 3149 if (drive_state[drive].fd_ref > 1) { 3150 fdc_state[current_fdc].rawcmd = 2; 3151 break; 3152 } 3153 } else if (drive_state[drive].fd_ref) { 3154 fdc_state[current_fdc].rawcmd = 2; 3155 break; 3156 } 3157 } 3158 3159 if (fdc_state[current_fdc].reset) 3160 return -EIO; 3161 3162 ret = raw_cmd_copyin(cmd, param, &my_raw_cmd); 3163 if (ret) { 3164 raw_cmd_free(&my_raw_cmd); 3165 return ret; 3166 } 3167 3168 raw_cmd = my_raw_cmd; 3169 cont = &raw_cmd_cont; 3170 ret = wait_til_done(floppy_start, true); 3171 debug_dcl(drive_params[current_drive].flags, 3172 "calling disk change from raw_cmd ioctl\n"); 3173 3174 if (ret != -EINTR && fdc_state[current_fdc].reset) 3175 ret = -EIO; 3176 3177 drive_state[current_drive].track = NO_TRACK; 3178 3179 ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd); 3180 if (!ret) 3181 ret = ret2; 3182 raw_cmd_free(&my_raw_cmd); 3183 return ret; 3184 } 3185 3186 static int invalidate_drive(struct block_device *bdev) 3187 { 3188 /* invalidate the buffer track to force a reread */ 3189 set_bit((long)bdev->bd_disk->private_data, &fake_change); 3190 process_fd_request(); 3191 if (bdev_check_media_change(bdev)) 3192 floppy_revalidate(bdev->bd_disk); 3193 return 0; 3194 } 3195 3196 static int set_geometry(unsigned int cmd, struct floppy_struct *g, 3197 int drive, int type, struct block_device *bdev) 3198 { 3199 int cnt; 3200 3201 /* sanity checking for parameters. */ 3202 if ((int)g->sect <= 0 || 3203 (int)g->head <= 0 || 3204 /* check for overflow in max_sector */ 3205 (int)(g->sect * g->head) <= 0 || 3206 /* check for zero in raw_cmd->cmd[F_SECT_PER_TRACK] */ 3207 (unsigned char)((g->sect << 2) >> FD_SIZECODE(g)) == 0 || 3208 g->track <= 0 || g->track > drive_params[drive].tracks >> STRETCH(g) || 3209 /* check if reserved bits are set */ 3210 (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_SECTBASEMASK)) != 0) 3211 return -EINVAL; 3212 if (type) { 3213 if (!capable(CAP_SYS_ADMIN)) 3214 return -EPERM; 3215 mutex_lock(&open_lock); 3216 if (lock_fdc(drive)) { 3217 mutex_unlock(&open_lock); 3218 return -EINTR; 3219 } 3220 floppy_type[type] = *g; 3221 floppy_type[type].name = "user format"; 3222 for (cnt = type << 2; cnt < (type << 2) + 4; cnt++) 3223 floppy_sizes[cnt] = floppy_sizes[cnt + 0x80] = 3224 floppy_type[type].size + 1; 3225 process_fd_request(); 3226 for (cnt = 0; cnt < N_DRIVE; cnt++) { 3227 struct block_device *bdev = opened_bdev[cnt]; 3228 if (!bdev || ITYPE(drive_state[cnt].fd_device) != type) 3229 continue; 3230 __invalidate_device(bdev, true); 3231 } 3232 mutex_unlock(&open_lock); 3233 } else { 3234 int oldStretch; 3235 3236 if (lock_fdc(drive)) 3237 return -EINTR; 3238 if (cmd != FDDEFPRM) { 3239 /* notice a disk change immediately, else 3240 * we lose our settings immediately*/ 3241 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR) 3242 return -EINTR; 3243 } 3244 oldStretch = g->stretch; 3245 user_params[drive] = *g; 3246 if (buffer_drive == drive) 3247 SUPBOUND(buffer_max, user_params[drive].sect); 3248 current_type[drive] = &user_params[drive]; 3249 floppy_sizes[drive] = user_params[drive].size; 3250 if (cmd == FDDEFPRM) 3251 drive_state[current_drive].keep_data = -1; 3252 else 3253 drive_state[current_drive].keep_data = 1; 3254 /* invalidation. Invalidate only when needed, i.e. 3255 * when there are already sectors in the buffer cache 3256 * whose number will change. This is useful, because 3257 * mtools often changes the geometry of the disk after 3258 * looking at the boot block */ 3259 if (drive_state[current_drive].maxblock > user_params[drive].sect || 3260 drive_state[current_drive].maxtrack || 3261 ((user_params[drive].sect ^ oldStretch) & 3262 (FD_SWAPSIDES | FD_SECTBASEMASK))) 3263 invalidate_drive(bdev); 3264 else 3265 process_fd_request(); 3266 } 3267 return 0; 3268 } 3269 3270 /* handle obsolete ioctl's */ 3271 static unsigned int ioctl_table[] = { 3272 FDCLRPRM, 3273 FDSETPRM, 3274 FDDEFPRM, 3275 FDGETPRM, 3276 FDMSGON, 3277 FDMSGOFF, 3278 FDFMTBEG, 3279 FDFMTTRK, 3280 FDFMTEND, 3281 FDSETEMSGTRESH, 3282 FDFLUSH, 3283 FDSETMAXERRS, 3284 FDGETMAXERRS, 3285 FDGETDRVTYP, 3286 FDSETDRVPRM, 3287 FDGETDRVPRM, 3288 FDGETDRVSTAT, 3289 FDPOLLDRVSTAT, 3290 FDRESET, 3291 FDGETFDCSTAT, 3292 FDWERRORCLR, 3293 FDWERRORGET, 3294 FDRAWCMD, 3295 FDEJECT, 3296 FDTWADDLE 3297 }; 3298 3299 static int normalize_ioctl(unsigned int *cmd, int *size) 3300 { 3301 int i; 3302 3303 for (i = 0; i < ARRAY_SIZE(ioctl_table); i++) { 3304 if ((*cmd & 0xffff) == (ioctl_table[i] & 0xffff)) { 3305 *size = _IOC_SIZE(*cmd); 3306 *cmd = ioctl_table[i]; 3307 if (*size > _IOC_SIZE(*cmd)) { 3308 pr_info("ioctl not yet supported\n"); 3309 return -EFAULT; 3310 } 3311 return 0; 3312 } 3313 } 3314 return -EINVAL; 3315 } 3316 3317 static int get_floppy_geometry(int drive, int type, struct floppy_struct **g) 3318 { 3319 if (type) 3320 *g = &floppy_type[type]; 3321 else { 3322 if (lock_fdc(drive)) 3323 return -EINTR; 3324 if (poll_drive(false, 0) == -EINTR) 3325 return -EINTR; 3326 process_fd_request(); 3327 *g = current_type[drive]; 3328 } 3329 if (!*g) 3330 return -ENODEV; 3331 return 0; 3332 } 3333 3334 static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 3335 { 3336 int drive = (long)bdev->bd_disk->private_data; 3337 int type = ITYPE(drive_state[drive].fd_device); 3338 struct floppy_struct *g; 3339 int ret; 3340 3341 ret = get_floppy_geometry(drive, type, &g); 3342 if (ret) 3343 return ret; 3344 3345 geo->heads = g->head; 3346 geo->sectors = g->sect; 3347 geo->cylinders = g->track; 3348 return 0; 3349 } 3350 3351 static bool valid_floppy_drive_params(const short autodetect[FD_AUTODETECT_SIZE], 3352 int native_format) 3353 { 3354 size_t floppy_type_size = ARRAY_SIZE(floppy_type); 3355 size_t i = 0; 3356 3357 for (i = 0; i < FD_AUTODETECT_SIZE; ++i) { 3358 if (autodetect[i] < 0 || 3359 autodetect[i] >= floppy_type_size) 3360 return false; 3361 } 3362 3363 if (native_format < 0 || native_format >= floppy_type_size) 3364 return false; 3365 3366 return true; 3367 } 3368 3369 static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, 3370 unsigned long param) 3371 { 3372 int drive = (long)bdev->bd_disk->private_data; 3373 int type = ITYPE(drive_state[drive].fd_device); 3374 int i; 3375 int ret; 3376 int size; 3377 union inparam { 3378 struct floppy_struct g; /* geometry */ 3379 struct format_descr f; 3380 struct floppy_max_errors max_errors; 3381 struct floppy_drive_params dp; 3382 } inparam; /* parameters coming from user space */ 3383 const void *outparam; /* parameters passed back to user space */ 3384 3385 /* convert compatibility eject ioctls into floppy eject ioctl. 3386 * We do this in order to provide a means to eject floppy disks before 3387 * installing the new fdutils package */ 3388 if (cmd == CDROMEJECT || /* CD-ROM eject */ 3389 cmd == 0x6470) { /* SunOS floppy eject */ 3390 DPRINT("obsolete eject ioctl\n"); 3391 DPRINT("please use floppycontrol --eject\n"); 3392 cmd = FDEJECT; 3393 } 3394 3395 if (!((cmd & 0xff00) == 0x0200)) 3396 return -EINVAL; 3397 3398 /* convert the old style command into a new style command */ 3399 ret = normalize_ioctl(&cmd, &size); 3400 if (ret) 3401 return ret; 3402 3403 /* permission checks */ 3404 if (((cmd & 0x40) && !(mode & (FMODE_WRITE | FMODE_WRITE_IOCTL))) || 3405 ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))) 3406 return -EPERM; 3407 3408 if (WARN_ON(size < 0 || size > sizeof(inparam))) 3409 return -EINVAL; 3410 3411 /* copyin */ 3412 memset(&inparam, 0, sizeof(inparam)); 3413 if (_IOC_DIR(cmd) & _IOC_WRITE) { 3414 ret = fd_copyin((void __user *)param, &inparam, size); 3415 if (ret) 3416 return ret; 3417 } 3418 3419 switch (cmd) { 3420 case FDEJECT: 3421 if (drive_state[drive].fd_ref != 1) 3422 /* somebody else has this drive open */ 3423 return -EBUSY; 3424 if (lock_fdc(drive)) 3425 return -EINTR; 3426 3427 /* do the actual eject. Fails on 3428 * non-Sparc architectures */ 3429 ret = fd_eject(UNIT(drive)); 3430 3431 set_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags); 3432 set_bit(FD_VERIFY_BIT, &drive_state[drive].flags); 3433 process_fd_request(); 3434 return ret; 3435 case FDCLRPRM: 3436 if (lock_fdc(drive)) 3437 return -EINTR; 3438 current_type[drive] = NULL; 3439 floppy_sizes[drive] = MAX_DISK_SIZE << 1; 3440 drive_state[drive].keep_data = 0; 3441 return invalidate_drive(bdev); 3442 case FDSETPRM: 3443 case FDDEFPRM: 3444 return set_geometry(cmd, &inparam.g, drive, type, bdev); 3445 case FDGETPRM: 3446 ret = get_floppy_geometry(drive, type, 3447 (struct floppy_struct **)&outparam); 3448 if (ret) 3449 return ret; 3450 memcpy(&inparam.g, outparam, 3451 offsetof(struct floppy_struct, name)); 3452 outparam = &inparam.g; 3453 break; 3454 case FDMSGON: 3455 drive_params[drive].flags |= FTD_MSG; 3456 return 0; 3457 case FDMSGOFF: 3458 drive_params[drive].flags &= ~FTD_MSG; 3459 return 0; 3460 case FDFMTBEG: 3461 if (lock_fdc(drive)) 3462 return -EINTR; 3463 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR) 3464 return -EINTR; 3465 ret = drive_state[drive].flags; 3466 process_fd_request(); 3467 if (ret & FD_VERIFY) 3468 return -ENODEV; 3469 if (!(ret & FD_DISK_WRITABLE)) 3470 return -EROFS; 3471 return 0; 3472 case FDFMTTRK: 3473 if (drive_state[drive].fd_ref != 1) 3474 return -EBUSY; 3475 return do_format(drive, &inparam.f); 3476 case FDFMTEND: 3477 case FDFLUSH: 3478 if (lock_fdc(drive)) 3479 return -EINTR; 3480 return invalidate_drive(bdev); 3481 case FDSETEMSGTRESH: 3482 drive_params[drive].max_errors.reporting = (unsigned short)(param & 0x0f); 3483 return 0; 3484 case FDGETMAXERRS: 3485 outparam = &drive_params[drive].max_errors; 3486 break; 3487 case FDSETMAXERRS: 3488 drive_params[drive].max_errors = inparam.max_errors; 3489 break; 3490 case FDGETDRVTYP: 3491 outparam = drive_name(type, drive); 3492 SUPBOUND(size, strlen((const char *)outparam) + 1); 3493 break; 3494 case FDSETDRVPRM: 3495 if (!valid_floppy_drive_params(inparam.dp.autodetect, 3496 inparam.dp.native_format)) 3497 return -EINVAL; 3498 drive_params[drive] = inparam.dp; 3499 break; 3500 case FDGETDRVPRM: 3501 outparam = &drive_params[drive]; 3502 break; 3503 case FDPOLLDRVSTAT: 3504 if (lock_fdc(drive)) 3505 return -EINTR; 3506 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR) 3507 return -EINTR; 3508 process_fd_request(); 3509 fallthrough; 3510 case FDGETDRVSTAT: 3511 outparam = &drive_state[drive]; 3512 break; 3513 case FDRESET: 3514 return user_reset_fdc(drive, (int)param, true); 3515 case FDGETFDCSTAT: 3516 outparam = &fdc_state[FDC(drive)]; 3517 break; 3518 case FDWERRORCLR: 3519 memset(&write_errors[drive], 0, sizeof(write_errors[drive])); 3520 return 0; 3521 case FDWERRORGET: 3522 outparam = &write_errors[drive]; 3523 break; 3524 case FDRAWCMD: 3525 if (type) 3526 return -EINVAL; 3527 if (lock_fdc(drive)) 3528 return -EINTR; 3529 set_floppy(drive); 3530 i = raw_cmd_ioctl(cmd, (void __user *)param); 3531 if (i == -EINTR) 3532 return -EINTR; 3533 process_fd_request(); 3534 return i; 3535 case FDTWADDLE: 3536 if (lock_fdc(drive)) 3537 return -EINTR; 3538 twaddle(current_fdc, current_drive); 3539 process_fd_request(); 3540 return 0; 3541 default: 3542 return -EINVAL; 3543 } 3544 3545 if (_IOC_DIR(cmd) & _IOC_READ) 3546 return fd_copyout((void __user *)param, outparam, size); 3547 3548 return 0; 3549 } 3550 3551 static int fd_ioctl(struct block_device *bdev, fmode_t mode, 3552 unsigned int cmd, unsigned long param) 3553 { 3554 int ret; 3555 3556 mutex_lock(&floppy_mutex); 3557 ret = fd_locked_ioctl(bdev, mode, cmd, param); 3558 mutex_unlock(&floppy_mutex); 3559 3560 return ret; 3561 } 3562 3563 #ifdef CONFIG_COMPAT 3564 3565 struct compat_floppy_drive_params { 3566 char cmos; 3567 compat_ulong_t max_dtr; 3568 compat_ulong_t hlt; 3569 compat_ulong_t hut; 3570 compat_ulong_t srt; 3571 compat_ulong_t spinup; 3572 compat_ulong_t spindown; 3573 unsigned char spindown_offset; 3574 unsigned char select_delay; 3575 unsigned char rps; 3576 unsigned char tracks; 3577 compat_ulong_t timeout; 3578 unsigned char interleave_sect; 3579 struct floppy_max_errors max_errors; 3580 char flags; 3581 char read_track; 3582 short autodetect[FD_AUTODETECT_SIZE]; 3583 compat_int_t checkfreq; 3584 compat_int_t native_format; 3585 }; 3586 3587 struct compat_floppy_drive_struct { 3588 signed char flags; 3589 compat_ulong_t spinup_date; 3590 compat_ulong_t select_date; 3591 compat_ulong_t first_read_date; 3592 short probed_format; 3593 short track; 3594 short maxblock; 3595 short maxtrack; 3596 compat_int_t generation; 3597 compat_int_t keep_data; 3598 compat_int_t fd_ref; 3599 compat_int_t fd_device; 3600 compat_int_t last_checked; 3601 compat_caddr_t dmabuf; 3602 compat_int_t bufblocks; 3603 }; 3604 3605 struct compat_floppy_fdc_state { 3606 compat_int_t spec1; 3607 compat_int_t spec2; 3608 compat_int_t dtr; 3609 unsigned char version; 3610 unsigned char dor; 3611 compat_ulong_t address; 3612 unsigned int rawcmd:2; 3613 unsigned int reset:1; 3614 unsigned int need_configure:1; 3615 unsigned int perp_mode:2; 3616 unsigned int has_fifo:1; 3617 unsigned int driver_version; 3618 unsigned char track[4]; 3619 }; 3620 3621 struct compat_floppy_write_errors { 3622 unsigned int write_errors; 3623 compat_ulong_t first_error_sector; 3624 compat_int_t first_error_generation; 3625 compat_ulong_t last_error_sector; 3626 compat_int_t last_error_generation; 3627 compat_uint_t badness; 3628 }; 3629 3630 #define FDSETPRM32 _IOW(2, 0x42, struct compat_floppy_struct) 3631 #define FDDEFPRM32 _IOW(2, 0x43, struct compat_floppy_struct) 3632 #define FDSETDRVPRM32 _IOW(2, 0x90, struct compat_floppy_drive_params) 3633 #define FDGETDRVPRM32 _IOR(2, 0x11, struct compat_floppy_drive_params) 3634 #define FDGETDRVSTAT32 _IOR(2, 0x12, struct compat_floppy_drive_struct) 3635 #define FDPOLLDRVSTAT32 _IOR(2, 0x13, struct compat_floppy_drive_struct) 3636 #define FDGETFDCSTAT32 _IOR(2, 0x15, struct compat_floppy_fdc_state) 3637 #define FDWERRORGET32 _IOR(2, 0x17, struct compat_floppy_write_errors) 3638 3639 static int compat_set_geometry(struct block_device *bdev, fmode_t mode, unsigned int cmd, 3640 struct compat_floppy_struct __user *arg) 3641 { 3642 struct floppy_struct v; 3643 int drive, type; 3644 int err; 3645 3646 BUILD_BUG_ON(offsetof(struct floppy_struct, name) != 3647 offsetof(struct compat_floppy_struct, name)); 3648 3649 if (!(mode & (FMODE_WRITE | FMODE_WRITE_IOCTL))) 3650 return -EPERM; 3651 3652 memset(&v, 0, sizeof(struct floppy_struct)); 3653 if (copy_from_user(&v, arg, offsetof(struct floppy_struct, name))) 3654 return -EFAULT; 3655 3656 mutex_lock(&floppy_mutex); 3657 drive = (long)bdev->bd_disk->private_data; 3658 type = ITYPE(drive_state[drive].fd_device); 3659 err = set_geometry(cmd == FDSETPRM32 ? FDSETPRM : FDDEFPRM, 3660 &v, drive, type, bdev); 3661 mutex_unlock(&floppy_mutex); 3662 return err; 3663 } 3664 3665 static int compat_get_prm(int drive, 3666 struct compat_floppy_struct __user *arg) 3667 { 3668 struct compat_floppy_struct v; 3669 struct floppy_struct *p; 3670 int err; 3671 3672 memset(&v, 0, sizeof(v)); 3673 mutex_lock(&floppy_mutex); 3674 err = get_floppy_geometry(drive, ITYPE(drive_state[drive].fd_device), 3675 &p); 3676 if (err) { 3677 mutex_unlock(&floppy_mutex); 3678 return err; 3679 } 3680 memcpy(&v, p, offsetof(struct floppy_struct, name)); 3681 mutex_unlock(&floppy_mutex); 3682 if (copy_to_user(arg, &v, sizeof(struct compat_floppy_struct))) 3683 return -EFAULT; 3684 return 0; 3685 } 3686 3687 static int compat_setdrvprm(int drive, 3688 struct compat_floppy_drive_params __user *arg) 3689 { 3690 struct compat_floppy_drive_params v; 3691 3692 if (!capable(CAP_SYS_ADMIN)) 3693 return -EPERM; 3694 if (copy_from_user(&v, arg, sizeof(struct compat_floppy_drive_params))) 3695 return -EFAULT; 3696 if (!valid_floppy_drive_params(v.autodetect, v.native_format)) 3697 return -EINVAL; 3698 mutex_lock(&floppy_mutex); 3699 drive_params[drive].cmos = v.cmos; 3700 drive_params[drive].max_dtr = v.max_dtr; 3701 drive_params[drive].hlt = v.hlt; 3702 drive_params[drive].hut = v.hut; 3703 drive_params[drive].srt = v.srt; 3704 drive_params[drive].spinup = v.spinup; 3705 drive_params[drive].spindown = v.spindown; 3706 drive_params[drive].spindown_offset = v.spindown_offset; 3707 drive_params[drive].select_delay = v.select_delay; 3708 drive_params[drive].rps = v.rps; 3709 drive_params[drive].tracks = v.tracks; 3710 drive_params[drive].timeout = v.timeout; 3711 drive_params[drive].interleave_sect = v.interleave_sect; 3712 drive_params[drive].max_errors = v.max_errors; 3713 drive_params[drive].flags = v.flags; 3714 drive_params[drive].read_track = v.read_track; 3715 memcpy(drive_params[drive].autodetect, v.autodetect, 3716 sizeof(v.autodetect)); 3717 drive_params[drive].checkfreq = v.checkfreq; 3718 drive_params[drive].native_format = v.native_format; 3719 mutex_unlock(&floppy_mutex); 3720 return 0; 3721 } 3722 3723 static int compat_getdrvprm(int drive, 3724 struct compat_floppy_drive_params __user *arg) 3725 { 3726 struct compat_floppy_drive_params v; 3727 3728 memset(&v, 0, sizeof(struct compat_floppy_drive_params)); 3729 mutex_lock(&floppy_mutex); 3730 v.cmos = drive_params[drive].cmos; 3731 v.max_dtr = drive_params[drive].max_dtr; 3732 v.hlt = drive_params[drive].hlt; 3733 v.hut = drive_params[drive].hut; 3734 v.srt = drive_params[drive].srt; 3735 v.spinup = drive_params[drive].spinup; 3736 v.spindown = drive_params[drive].spindown; 3737 v.spindown_offset = drive_params[drive].spindown_offset; 3738 v.select_delay = drive_params[drive].select_delay; 3739 v.rps = drive_params[drive].rps; 3740 v.tracks = drive_params[drive].tracks; 3741 v.timeout = drive_params[drive].timeout; 3742 v.interleave_sect = drive_params[drive].interleave_sect; 3743 v.max_errors = drive_params[drive].max_errors; 3744 v.flags = drive_params[drive].flags; 3745 v.read_track = drive_params[drive].read_track; 3746 memcpy(v.autodetect, drive_params[drive].autodetect, 3747 sizeof(v.autodetect)); 3748 v.checkfreq = drive_params[drive].checkfreq; 3749 v.native_format = drive_params[drive].native_format; 3750 mutex_unlock(&floppy_mutex); 3751 3752 if (copy_to_user(arg, &v, sizeof(struct compat_floppy_drive_params))) 3753 return -EFAULT; 3754 return 0; 3755 } 3756 3757 static int compat_getdrvstat(int drive, bool poll, 3758 struct compat_floppy_drive_struct __user *arg) 3759 { 3760 struct compat_floppy_drive_struct v; 3761 3762 memset(&v, 0, sizeof(struct compat_floppy_drive_struct)); 3763 mutex_lock(&floppy_mutex); 3764 3765 if (poll) { 3766 if (lock_fdc(drive)) 3767 goto Eintr; 3768 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR) 3769 goto Eintr; 3770 process_fd_request(); 3771 } 3772 v.spinup_date = drive_state[drive].spinup_date; 3773 v.select_date = drive_state[drive].select_date; 3774 v.first_read_date = drive_state[drive].first_read_date; 3775 v.probed_format = drive_state[drive].probed_format; 3776 v.track = drive_state[drive].track; 3777 v.maxblock = drive_state[drive].maxblock; 3778 v.maxtrack = drive_state[drive].maxtrack; 3779 v.generation = drive_state[drive].generation; 3780 v.keep_data = drive_state[drive].keep_data; 3781 v.fd_ref = drive_state[drive].fd_ref; 3782 v.fd_device = drive_state[drive].fd_device; 3783 v.last_checked = drive_state[drive].last_checked; 3784 v.dmabuf = (uintptr_t) drive_state[drive].dmabuf; 3785 v.bufblocks = drive_state[drive].bufblocks; 3786 mutex_unlock(&floppy_mutex); 3787 3788 if (copy_to_user(arg, &v, sizeof(struct compat_floppy_drive_struct))) 3789 return -EFAULT; 3790 return 0; 3791 Eintr: 3792 mutex_unlock(&floppy_mutex); 3793 return -EINTR; 3794 } 3795 3796 static int compat_getfdcstat(int drive, 3797 struct compat_floppy_fdc_state __user *arg) 3798 { 3799 struct compat_floppy_fdc_state v32; 3800 struct floppy_fdc_state v; 3801 3802 mutex_lock(&floppy_mutex); 3803 v = fdc_state[FDC(drive)]; 3804 mutex_unlock(&floppy_mutex); 3805 3806 memset(&v32, 0, sizeof(struct compat_floppy_fdc_state)); 3807 v32.spec1 = v.spec1; 3808 v32.spec2 = v.spec2; 3809 v32.dtr = v.dtr; 3810 v32.version = v.version; 3811 v32.dor = v.dor; 3812 v32.address = v.address; 3813 v32.rawcmd = v.rawcmd; 3814 v32.reset = v.reset; 3815 v32.need_configure = v.need_configure; 3816 v32.perp_mode = v.perp_mode; 3817 v32.has_fifo = v.has_fifo; 3818 v32.driver_version = v.driver_version; 3819 memcpy(v32.track, v.track, 4); 3820 if (copy_to_user(arg, &v32, sizeof(struct compat_floppy_fdc_state))) 3821 return -EFAULT; 3822 return 0; 3823 } 3824 3825 static int compat_werrorget(int drive, 3826 struct compat_floppy_write_errors __user *arg) 3827 { 3828 struct compat_floppy_write_errors v32; 3829 struct floppy_write_errors v; 3830 3831 memset(&v32, 0, sizeof(struct compat_floppy_write_errors)); 3832 mutex_lock(&floppy_mutex); 3833 v = write_errors[drive]; 3834 mutex_unlock(&floppy_mutex); 3835 v32.write_errors = v.write_errors; 3836 v32.first_error_sector = v.first_error_sector; 3837 v32.first_error_generation = v.first_error_generation; 3838 v32.last_error_sector = v.last_error_sector; 3839 v32.last_error_generation = v.last_error_generation; 3840 v32.badness = v.badness; 3841 if (copy_to_user(arg, &v32, sizeof(struct compat_floppy_write_errors))) 3842 return -EFAULT; 3843 return 0; 3844 } 3845 3846 static int fd_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, 3847 unsigned long param) 3848 { 3849 int drive = (long)bdev->bd_disk->private_data; 3850 switch (cmd) { 3851 case CDROMEJECT: /* CD-ROM eject */ 3852 case 0x6470: /* SunOS floppy eject */ 3853 3854 case FDMSGON: 3855 case FDMSGOFF: 3856 case FDSETEMSGTRESH: 3857 case FDFLUSH: 3858 case FDWERRORCLR: 3859 case FDEJECT: 3860 case FDCLRPRM: 3861 case FDFMTBEG: 3862 case FDRESET: 3863 case FDTWADDLE: 3864 return fd_ioctl(bdev, mode, cmd, param); 3865 case FDSETMAXERRS: 3866 case FDGETMAXERRS: 3867 case FDGETDRVTYP: 3868 case FDFMTEND: 3869 case FDFMTTRK: 3870 case FDRAWCMD: 3871 return fd_ioctl(bdev, mode, cmd, 3872 (unsigned long)compat_ptr(param)); 3873 case FDSETPRM32: 3874 case FDDEFPRM32: 3875 return compat_set_geometry(bdev, mode, cmd, compat_ptr(param)); 3876 case FDGETPRM32: 3877 return compat_get_prm(drive, compat_ptr(param)); 3878 case FDSETDRVPRM32: 3879 return compat_setdrvprm(drive, compat_ptr(param)); 3880 case FDGETDRVPRM32: 3881 return compat_getdrvprm(drive, compat_ptr(param)); 3882 case FDPOLLDRVSTAT32: 3883 return compat_getdrvstat(drive, true, compat_ptr(param)); 3884 case FDGETDRVSTAT32: 3885 return compat_getdrvstat(drive, false, compat_ptr(param)); 3886 case FDGETFDCSTAT32: 3887 return compat_getfdcstat(drive, compat_ptr(param)); 3888 case FDWERRORGET32: 3889 return compat_werrorget(drive, compat_ptr(param)); 3890 } 3891 return -EINVAL; 3892 } 3893 #endif 3894 3895 static void __init config_types(void) 3896 { 3897 bool has_drive = false; 3898 int drive; 3899 3900 /* read drive info out of physical CMOS */ 3901 drive = 0; 3902 if (!drive_params[drive].cmos) 3903 drive_params[drive].cmos = FLOPPY0_TYPE; 3904 drive = 1; 3905 if (!drive_params[drive].cmos) 3906 drive_params[drive].cmos = FLOPPY1_TYPE; 3907 3908 /* FIXME: additional physical CMOS drive detection should go here */ 3909 3910 for (drive = 0; drive < N_DRIVE; drive++) { 3911 unsigned int type = drive_params[drive].cmos; 3912 struct floppy_drive_params *params; 3913 const char *name = NULL; 3914 char temparea[32]; 3915 3916 if (type < ARRAY_SIZE(default_drive_params)) { 3917 params = &default_drive_params[type].params; 3918 if (type) { 3919 name = default_drive_params[type].name; 3920 allowed_drive_mask |= 1 << drive; 3921 } else 3922 allowed_drive_mask &= ~(1 << drive); 3923 } else { 3924 params = &default_drive_params[0].params; 3925 snprintf(temparea, sizeof(temparea), 3926 "unknown type %d (usb?)", type); 3927 name = temparea; 3928 } 3929 if (name) { 3930 const char *prepend; 3931 if (!has_drive) { 3932 prepend = ""; 3933 has_drive = true; 3934 pr_info("Floppy drive(s):"); 3935 } else { 3936 prepend = ","; 3937 } 3938 3939 pr_cont("%s fd%d is %s", prepend, drive, name); 3940 } 3941 drive_params[drive] = *params; 3942 } 3943 3944 if (has_drive) 3945 pr_cont("\n"); 3946 } 3947 3948 static void floppy_release(struct gendisk *disk, fmode_t mode) 3949 { 3950 int drive = (long)disk->private_data; 3951 3952 mutex_lock(&floppy_mutex); 3953 mutex_lock(&open_lock); 3954 if (!drive_state[drive].fd_ref--) { 3955 DPRINT("floppy_release with fd_ref == 0"); 3956 drive_state[drive].fd_ref = 0; 3957 } 3958 if (!drive_state[drive].fd_ref) 3959 opened_bdev[drive] = NULL; 3960 mutex_unlock(&open_lock); 3961 mutex_unlock(&floppy_mutex); 3962 } 3963 3964 /* 3965 * floppy_open check for aliasing (/dev/fd0 can be the same as 3966 * /dev/PS0 etc), and disallows simultaneous access to the same 3967 * drive with different device numbers. 3968 */ 3969 static int floppy_open(struct block_device *bdev, fmode_t mode) 3970 { 3971 int drive = (long)bdev->bd_disk->private_data; 3972 int old_dev, new_dev; 3973 int try; 3974 int res = -EBUSY; 3975 char *tmp; 3976 3977 mutex_lock(&floppy_mutex); 3978 mutex_lock(&open_lock); 3979 old_dev = drive_state[drive].fd_device; 3980 if (opened_bdev[drive] && opened_bdev[drive] != bdev) 3981 goto out2; 3982 3983 if (!drive_state[drive].fd_ref && (drive_params[drive].flags & FD_BROKEN_DCL)) { 3984 set_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags); 3985 set_bit(FD_VERIFY_BIT, &drive_state[drive].flags); 3986 } 3987 3988 drive_state[drive].fd_ref++; 3989 3990 opened_bdev[drive] = bdev; 3991 3992 res = -ENXIO; 3993 3994 if (!floppy_track_buffer) { 3995 /* if opening an ED drive, reserve a big buffer, 3996 * else reserve a small one */ 3997 if ((drive_params[drive].cmos == 6) || (drive_params[drive].cmos == 5)) 3998 try = 64; /* Only 48 actually useful */ 3999 else 4000 try = 32; /* Only 24 actually useful */ 4001 4002 tmp = (char *)fd_dma_mem_alloc(1024 * try); 4003 if (!tmp && !floppy_track_buffer) { 4004 try >>= 1; /* buffer only one side */ 4005 INFBOUND(try, 16); 4006 tmp = (char *)fd_dma_mem_alloc(1024 * try); 4007 } 4008 if (!tmp && !floppy_track_buffer) 4009 fallback_on_nodma_alloc(&tmp, 2048 * try); 4010 if (!tmp && !floppy_track_buffer) { 4011 DPRINT("Unable to allocate DMA memory\n"); 4012 goto out; 4013 } 4014 if (floppy_track_buffer) { 4015 if (tmp) 4016 fd_dma_mem_free((unsigned long)tmp, try * 1024); 4017 } else { 4018 buffer_min = buffer_max = -1; 4019 floppy_track_buffer = tmp; 4020 max_buffer_sectors = try; 4021 } 4022 } 4023 4024 new_dev = MINOR(bdev->bd_dev); 4025 drive_state[drive].fd_device = new_dev; 4026 set_capacity(disks[drive][ITYPE(new_dev)], floppy_sizes[new_dev]); 4027 if (old_dev != -1 && old_dev != new_dev) { 4028 if (buffer_drive == drive) 4029 buffer_track = -1; 4030 } 4031 4032 if (fdc_state[FDC(drive)].rawcmd == 1) 4033 fdc_state[FDC(drive)].rawcmd = 2; 4034 4035 if (!(mode & FMODE_NDELAY)) { 4036 if (mode & (FMODE_READ|FMODE_WRITE)) { 4037 drive_state[drive].last_checked = 0; 4038 clear_bit(FD_OPEN_SHOULD_FAIL_BIT, 4039 &drive_state[drive].flags); 4040 if (bdev_check_media_change(bdev)) 4041 floppy_revalidate(bdev->bd_disk); 4042 if (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags)) 4043 goto out; 4044 if (test_bit(FD_OPEN_SHOULD_FAIL_BIT, &drive_state[drive].flags)) 4045 goto out; 4046 } 4047 res = -EROFS; 4048 if ((mode & FMODE_WRITE) && 4049 !test_bit(FD_DISK_WRITABLE_BIT, &drive_state[drive].flags)) 4050 goto out; 4051 } 4052 mutex_unlock(&open_lock); 4053 mutex_unlock(&floppy_mutex); 4054 return 0; 4055 out: 4056 drive_state[drive].fd_ref--; 4057 4058 if (!drive_state[drive].fd_ref) 4059 opened_bdev[drive] = NULL; 4060 out2: 4061 mutex_unlock(&open_lock); 4062 mutex_unlock(&floppy_mutex); 4063 return res; 4064 } 4065 4066 /* 4067 * Check if the disk has been changed or if a change has been faked. 4068 */ 4069 static unsigned int floppy_check_events(struct gendisk *disk, 4070 unsigned int clearing) 4071 { 4072 int drive = (long)disk->private_data; 4073 4074 if (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags) || 4075 test_bit(FD_VERIFY_BIT, &drive_state[drive].flags)) 4076 return DISK_EVENT_MEDIA_CHANGE; 4077 4078 if (time_after(jiffies, drive_state[drive].last_checked + drive_params[drive].checkfreq)) { 4079 if (lock_fdc(drive)) 4080 return 0; 4081 poll_drive(false, 0); 4082 process_fd_request(); 4083 } 4084 4085 if (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags) || 4086 test_bit(FD_VERIFY_BIT, &drive_state[drive].flags) || 4087 test_bit(drive, &fake_change) || 4088 drive_no_geom(drive)) 4089 return DISK_EVENT_MEDIA_CHANGE; 4090 return 0; 4091 } 4092 4093 /* 4094 * This implements "read block 0" for floppy_revalidate(). 4095 * Needed for format autodetection, checking whether there is 4096 * a disk in the drive, and whether that disk is writable. 4097 */ 4098 4099 struct rb0_cbdata { 4100 int drive; 4101 struct completion complete; 4102 }; 4103 4104 static void floppy_rb0_cb(struct bio *bio) 4105 { 4106 struct rb0_cbdata *cbdata = (struct rb0_cbdata *)bio->bi_private; 4107 int drive = cbdata->drive; 4108 4109 if (bio->bi_status) { 4110 pr_info("floppy: error %d while reading block 0\n", 4111 bio->bi_status); 4112 set_bit(FD_OPEN_SHOULD_FAIL_BIT, &drive_state[drive].flags); 4113 } 4114 complete(&cbdata->complete); 4115 } 4116 4117 static int __floppy_read_block_0(struct block_device *bdev, int drive) 4118 { 4119 struct bio bio; 4120 struct bio_vec bio_vec; 4121 struct page *page; 4122 struct rb0_cbdata cbdata; 4123 4124 page = alloc_page(GFP_NOIO); 4125 if (!page) { 4126 process_fd_request(); 4127 return -ENOMEM; 4128 } 4129 4130 cbdata.drive = drive; 4131 4132 bio_init(&bio, &bio_vec, 1); 4133 bio_set_dev(&bio, bdev); 4134 bio_add_page(&bio, page, block_size(bdev), 0); 4135 4136 bio.bi_iter.bi_sector = 0; 4137 bio.bi_flags |= (1 << BIO_QUIET); 4138 bio.bi_private = &cbdata; 4139 bio.bi_end_io = floppy_rb0_cb; 4140 bio_set_op_attrs(&bio, REQ_OP_READ, 0); 4141 4142 init_completion(&cbdata.complete); 4143 4144 submit_bio(&bio); 4145 process_fd_request(); 4146 4147 wait_for_completion(&cbdata.complete); 4148 4149 __free_page(page); 4150 4151 return 0; 4152 } 4153 4154 /* revalidate the floppy disk, i.e. trigger format autodetection by reading 4155 * the bootblock (block 0). "Autodetection" is also needed to check whether 4156 * there is a disk in the drive at all... Thus we also do it for fixed 4157 * geometry formats */ 4158 static int floppy_revalidate(struct gendisk *disk) 4159 { 4160 int drive = (long)disk->private_data; 4161 int cf; 4162 int res = 0; 4163 4164 if (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags) || 4165 test_bit(FD_VERIFY_BIT, &drive_state[drive].flags) || 4166 test_bit(drive, &fake_change) || 4167 drive_no_geom(drive)) { 4168 if (WARN(atomic_read(&usage_count) == 0, 4169 "VFS: revalidate called on non-open device.\n")) 4170 return -EFAULT; 4171 4172 res = lock_fdc(drive); 4173 if (res) 4174 return res; 4175 cf = (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags) || 4176 test_bit(FD_VERIFY_BIT, &drive_state[drive].flags)); 4177 if (!(cf || test_bit(drive, &fake_change) || drive_no_geom(drive))) { 4178 process_fd_request(); /*already done by another thread */ 4179 return 0; 4180 } 4181 drive_state[drive].maxblock = 0; 4182 drive_state[drive].maxtrack = 0; 4183 if (buffer_drive == drive) 4184 buffer_track = -1; 4185 clear_bit(drive, &fake_change); 4186 clear_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags); 4187 if (cf) 4188 drive_state[drive].generation++; 4189 if (drive_no_geom(drive)) { 4190 /* auto-sensing */ 4191 res = __floppy_read_block_0(opened_bdev[drive], drive); 4192 } else { 4193 if (cf) 4194 poll_drive(false, FD_RAW_NEED_DISK); 4195 process_fd_request(); 4196 } 4197 } 4198 set_capacity(disk, floppy_sizes[drive_state[drive].fd_device]); 4199 return res; 4200 } 4201 4202 static const struct block_device_operations floppy_fops = { 4203 .owner = THIS_MODULE, 4204 .open = floppy_open, 4205 .release = floppy_release, 4206 .ioctl = fd_ioctl, 4207 .getgeo = fd_getgeo, 4208 .check_events = floppy_check_events, 4209 #ifdef CONFIG_COMPAT 4210 .compat_ioctl = fd_compat_ioctl, 4211 #endif 4212 }; 4213 4214 /* 4215 * Floppy Driver initialization 4216 * ============================= 4217 */ 4218 4219 /* Determine the floppy disk controller type */ 4220 /* This routine was written by David C. Niemi */ 4221 static char __init get_fdc_version(int fdc) 4222 { 4223 int r; 4224 4225 output_byte(fdc, FD_DUMPREGS); /* 82072 and better know DUMPREGS */ 4226 if (fdc_state[fdc].reset) 4227 return FDC_NONE; 4228 r = result(fdc); 4229 if (r <= 0x00) 4230 return FDC_NONE; /* No FDC present ??? */ 4231 if ((r == 1) && (reply_buffer[ST0] == 0x80)) { 4232 pr_info("FDC %d is an 8272A\n", fdc); 4233 return FDC_8272A; /* 8272a/765 don't know DUMPREGS */ 4234 } 4235 if (r != 10) { 4236 pr_info("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n", 4237 fdc, r); 4238 return FDC_UNKNOWN; 4239 } 4240 4241 if (!fdc_configure(fdc)) { 4242 pr_info("FDC %d is an 82072\n", fdc); 4243 return FDC_82072; /* 82072 doesn't know CONFIGURE */ 4244 } 4245 4246 output_byte(fdc, FD_PERPENDICULAR); 4247 if (need_more_output(fdc) == MORE_OUTPUT) { 4248 output_byte(fdc, 0); 4249 } else { 4250 pr_info("FDC %d is an 82072A\n", fdc); 4251 return FDC_82072A; /* 82072A as found on Sparcs. */ 4252 } 4253 4254 output_byte(fdc, FD_UNLOCK); 4255 r = result(fdc); 4256 if ((r == 1) && (reply_buffer[ST0] == 0x80)) { 4257 pr_info("FDC %d is a pre-1991 82077\n", fdc); 4258 return FDC_82077_ORIG; /* Pre-1991 82077, doesn't know 4259 * LOCK/UNLOCK */ 4260 } 4261 if ((r != 1) || (reply_buffer[ST0] != 0x00)) { 4262 pr_info("FDC %d init: UNLOCK: unexpected return of %d bytes.\n", 4263 fdc, r); 4264 return FDC_UNKNOWN; 4265 } 4266 output_byte(fdc, FD_PARTID); 4267 r = result(fdc); 4268 if (r != 1) { 4269 pr_info("FDC %d init: PARTID: unexpected return of %d bytes.\n", 4270 fdc, r); 4271 return FDC_UNKNOWN; 4272 } 4273 if (reply_buffer[ST0] == 0x80) { 4274 pr_info("FDC %d is a post-1991 82077\n", fdc); 4275 return FDC_82077; /* Revised 82077AA passes all the tests */ 4276 } 4277 switch (reply_buffer[ST0] >> 5) { 4278 case 0x0: 4279 /* Either a 82078-1 or a 82078SL running at 5Volt */ 4280 pr_info("FDC %d is an 82078.\n", fdc); 4281 return FDC_82078; 4282 case 0x1: 4283 pr_info("FDC %d is a 44pin 82078\n", fdc); 4284 return FDC_82078; 4285 case 0x2: 4286 pr_info("FDC %d is a S82078B\n", fdc); 4287 return FDC_S82078B; 4288 case 0x3: 4289 pr_info("FDC %d is a National Semiconductor PC87306\n", fdc); 4290 return FDC_87306; 4291 default: 4292 pr_info("FDC %d init: 82078 variant with unknown PARTID=%d.\n", 4293 fdc, reply_buffer[ST0] >> 5); 4294 return FDC_82078_UNKN; 4295 } 4296 } /* get_fdc_version */ 4297 4298 /* lilo configuration */ 4299 4300 static void __init floppy_set_flags(int *ints, int param, int param2) 4301 { 4302 int i; 4303 4304 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) { 4305 if (param) 4306 default_drive_params[i].params.flags |= param2; 4307 else 4308 default_drive_params[i].params.flags &= ~param2; 4309 } 4310 DPRINT("%s flag 0x%x\n", param2 ? "Setting" : "Clearing", param); 4311 } 4312 4313 static void __init daring(int *ints, int param, int param2) 4314 { 4315 int i; 4316 4317 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) { 4318 if (param) { 4319 default_drive_params[i].params.select_delay = 0; 4320 default_drive_params[i].params.flags |= 4321 FD_SILENT_DCL_CLEAR; 4322 } else { 4323 default_drive_params[i].params.select_delay = 4324 2 * HZ / 100; 4325 default_drive_params[i].params.flags &= 4326 ~FD_SILENT_DCL_CLEAR; 4327 } 4328 } 4329 DPRINT("Assuming %s floppy hardware\n", param ? "standard" : "broken"); 4330 } 4331 4332 static void __init set_cmos(int *ints, int dummy, int dummy2) 4333 { 4334 int current_drive = 0; 4335 4336 if (ints[0] != 2) { 4337 DPRINT("wrong number of parameters for CMOS\n"); 4338 return; 4339 } 4340 current_drive = ints[1]; 4341 if (current_drive < 0 || current_drive >= 8) { 4342 DPRINT("bad drive for set_cmos\n"); 4343 return; 4344 } 4345 #if N_FDC > 1 4346 if (current_drive >= 4 && !FDC2) 4347 FDC2 = 0x370; 4348 #endif 4349 drive_params[current_drive].cmos = ints[2]; 4350 DPRINT("setting CMOS code to %d\n", ints[2]); 4351 } 4352 4353 static struct param_table { 4354 const char *name; 4355 void (*fn) (int *ints, int param, int param2); 4356 int *var; 4357 int def_param; 4358 int param2; 4359 } config_params[] __initdata = { 4360 {"allowed_drive_mask", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */ 4361 {"all_drives", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */ 4362 {"asus_pci", NULL, &allowed_drive_mask, 0x33, 0}, 4363 {"irq", NULL, &FLOPPY_IRQ, 6, 0}, 4364 {"dma", NULL, &FLOPPY_DMA, 2, 0}, 4365 {"daring", daring, NULL, 1, 0}, 4366 #if N_FDC > 1 4367 {"two_fdc", NULL, &FDC2, 0x370, 0}, 4368 {"one_fdc", NULL, &FDC2, 0, 0}, 4369 #endif 4370 {"thinkpad", floppy_set_flags, NULL, 1, FD_INVERTED_DCL}, 4371 {"broken_dcl", floppy_set_flags, NULL, 1, FD_BROKEN_DCL}, 4372 {"messages", floppy_set_flags, NULL, 1, FTD_MSG}, 4373 {"silent_dcl_clear", floppy_set_flags, NULL, 1, FD_SILENT_DCL_CLEAR}, 4374 {"debug", floppy_set_flags, NULL, 1, FD_DEBUG}, 4375 {"nodma", NULL, &can_use_virtual_dma, 1, 0}, 4376 {"omnibook", NULL, &can_use_virtual_dma, 1, 0}, 4377 {"yesdma", NULL, &can_use_virtual_dma, 0, 0}, 4378 {"fifo_depth", NULL, &fifo_depth, 0xa, 0}, 4379 {"nofifo", NULL, &no_fifo, 0x20, 0}, 4380 {"usefifo", NULL, &no_fifo, 0, 0}, 4381 {"cmos", set_cmos, NULL, 0, 0}, 4382 {"slow", NULL, &slow_floppy, 1, 0}, 4383 {"unexpected_interrupts", NULL, &print_unex, 1, 0}, 4384 {"no_unexpected_interrupts", NULL, &print_unex, 0, 0}, 4385 {"L40SX", NULL, &print_unex, 0, 0} 4386 4387 EXTRA_FLOPPY_PARAMS 4388 }; 4389 4390 static int __init floppy_setup(char *str) 4391 { 4392 int i; 4393 int param; 4394 int ints[11]; 4395 4396 str = get_options(str, ARRAY_SIZE(ints), ints); 4397 if (str) { 4398 for (i = 0; i < ARRAY_SIZE(config_params); i++) { 4399 if (strcmp(str, config_params[i].name) == 0) { 4400 if (ints[0]) 4401 param = ints[1]; 4402 else 4403 param = config_params[i].def_param; 4404 if (config_params[i].fn) 4405 config_params[i].fn(ints, param, 4406 config_params[i]. 4407 param2); 4408 if (config_params[i].var) { 4409 DPRINT("%s=%d\n", str, param); 4410 *config_params[i].var = param; 4411 } 4412 return 1; 4413 } 4414 } 4415 } 4416 if (str) { 4417 DPRINT("unknown floppy option [%s]\n", str); 4418 4419 DPRINT("allowed options are:"); 4420 for (i = 0; i < ARRAY_SIZE(config_params); i++) 4421 pr_cont(" %s", config_params[i].name); 4422 pr_cont("\n"); 4423 } else 4424 DPRINT("botched floppy option\n"); 4425 DPRINT("Read Documentation/admin-guide/blockdev/floppy.rst\n"); 4426 return 0; 4427 } 4428 4429 static int have_no_fdc = -ENODEV; 4430 4431 static ssize_t floppy_cmos_show(struct device *dev, 4432 struct device_attribute *attr, char *buf) 4433 { 4434 struct platform_device *p = to_platform_device(dev); 4435 int drive; 4436 4437 drive = p->id; 4438 return sprintf(buf, "%X\n", drive_params[drive].cmos); 4439 } 4440 4441 static DEVICE_ATTR(cmos, 0444, floppy_cmos_show, NULL); 4442 4443 static struct attribute *floppy_dev_attrs[] = { 4444 &dev_attr_cmos.attr, 4445 NULL 4446 }; 4447 4448 ATTRIBUTE_GROUPS(floppy_dev); 4449 4450 static void floppy_device_release(struct device *dev) 4451 { 4452 } 4453 4454 static int floppy_resume(struct device *dev) 4455 { 4456 int fdc; 4457 int saved_drive; 4458 4459 saved_drive = current_drive; 4460 for (fdc = 0; fdc < N_FDC; fdc++) 4461 if (fdc_state[fdc].address != -1) 4462 user_reset_fdc(REVDRIVE(fdc, 0), FD_RESET_ALWAYS, false); 4463 set_fdc(saved_drive); 4464 return 0; 4465 } 4466 4467 static const struct dev_pm_ops floppy_pm_ops = { 4468 .resume = floppy_resume, 4469 .restore = floppy_resume, 4470 }; 4471 4472 static struct platform_driver floppy_driver = { 4473 .driver = { 4474 .name = "floppy", 4475 .pm = &floppy_pm_ops, 4476 }, 4477 }; 4478 4479 static const struct blk_mq_ops floppy_mq_ops = { 4480 .queue_rq = floppy_queue_rq, 4481 }; 4482 4483 static struct platform_device floppy_device[N_DRIVE]; 4484 static bool registered[N_DRIVE]; 4485 4486 static bool floppy_available(int drive) 4487 { 4488 if (!(allowed_drive_mask & (1 << drive))) 4489 return false; 4490 if (fdc_state[FDC(drive)].version == FDC_NONE) 4491 return false; 4492 return true; 4493 } 4494 4495 static int floppy_alloc_disk(unsigned int drive, unsigned int type) 4496 { 4497 struct gendisk *disk; 4498 4499 disk = blk_mq_alloc_disk(&tag_sets[drive], NULL); 4500 if (IS_ERR(disk)) 4501 return PTR_ERR(disk); 4502 4503 blk_queue_max_hw_sectors(disk->queue, 64); 4504 disk->major = FLOPPY_MAJOR; 4505 disk->first_minor = TOMINOR(drive) | (type << 2); 4506 disk->minors = 1; 4507 disk->fops = &floppy_fops; 4508 disk->flags |= GENHD_FL_NO_PART; 4509 disk->events = DISK_EVENT_MEDIA_CHANGE; 4510 if (type) 4511 sprintf(disk->disk_name, "fd%d_type%d", drive, type); 4512 else 4513 sprintf(disk->disk_name, "fd%d", drive); 4514 /* to be cleaned up... */ 4515 disk->private_data = (void *)(long)drive; 4516 disk->flags |= GENHD_FL_REMOVABLE; 4517 4518 disks[drive][type] = disk; 4519 return 0; 4520 } 4521 4522 static DEFINE_MUTEX(floppy_probe_lock); 4523 4524 static void floppy_probe(dev_t dev) 4525 { 4526 unsigned int drive = (MINOR(dev) & 3) | ((MINOR(dev) & 0x80) >> 5); 4527 unsigned int type = (MINOR(dev) >> 2) & 0x1f; 4528 4529 if (drive >= N_DRIVE || !floppy_available(drive) || 4530 type >= ARRAY_SIZE(floppy_type)) 4531 return; 4532 4533 mutex_lock(&floppy_probe_lock); 4534 if (disks[drive][type]) 4535 goto out; 4536 if (floppy_alloc_disk(drive, type)) 4537 goto out; 4538 if (add_disk(disks[drive][type])) 4539 goto cleanup_disk; 4540 out: 4541 mutex_unlock(&floppy_probe_lock); 4542 return; 4543 4544 cleanup_disk: 4545 blk_cleanup_disk(disks[drive][type]); 4546 disks[drive][type] = NULL; 4547 mutex_unlock(&floppy_probe_lock); 4548 } 4549 4550 static int __init do_floppy_init(void) 4551 { 4552 int i, unit, drive, err; 4553 4554 set_debugt(); 4555 interruptjiffies = resultjiffies = jiffies; 4556 4557 #if defined(CONFIG_PPC) 4558 if (check_legacy_ioport(FDC1)) 4559 return -ENODEV; 4560 #endif 4561 4562 raw_cmd = NULL; 4563 4564 floppy_wq = alloc_ordered_workqueue("floppy", 0); 4565 if (!floppy_wq) 4566 return -ENOMEM; 4567 4568 for (drive = 0; drive < N_DRIVE; drive++) { 4569 memset(&tag_sets[drive], 0, sizeof(tag_sets[drive])); 4570 tag_sets[drive].ops = &floppy_mq_ops; 4571 tag_sets[drive].nr_hw_queues = 1; 4572 tag_sets[drive].nr_maps = 1; 4573 tag_sets[drive].queue_depth = 2; 4574 tag_sets[drive].numa_node = NUMA_NO_NODE; 4575 tag_sets[drive].flags = BLK_MQ_F_SHOULD_MERGE; 4576 err = blk_mq_alloc_tag_set(&tag_sets[drive]); 4577 if (err) 4578 goto out_put_disk; 4579 4580 err = floppy_alloc_disk(drive, 0); 4581 if (err) 4582 goto out_put_disk; 4583 4584 timer_setup(&motor_off_timer[drive], motor_off_callback, 0); 4585 } 4586 4587 err = __register_blkdev(FLOPPY_MAJOR, "fd", floppy_probe); 4588 if (err) 4589 goto out_put_disk; 4590 4591 err = platform_driver_register(&floppy_driver); 4592 if (err) 4593 goto out_unreg_blkdev; 4594 4595 for (i = 0; i < 256; i++) 4596 if (ITYPE(i)) 4597 floppy_sizes[i] = floppy_type[ITYPE(i)].size; 4598 else 4599 floppy_sizes[i] = MAX_DISK_SIZE << 1; 4600 4601 reschedule_timeout(MAXTIMEOUT, "floppy init"); 4602 config_types(); 4603 4604 for (i = 0; i < N_FDC; i++) { 4605 memset(&fdc_state[i], 0, sizeof(*fdc_state)); 4606 fdc_state[i].dtr = -1; 4607 fdc_state[i].dor = 0x4; 4608 #if defined(__sparc__) || defined(__mc68000__) 4609 /*sparcs/sun3x don't have a DOR reset which we can fall back on to */ 4610 #ifdef __mc68000__ 4611 if (MACH_IS_SUN3X) 4612 #endif 4613 fdc_state[i].version = FDC_82072A; 4614 #endif 4615 } 4616 4617 use_virtual_dma = can_use_virtual_dma & 1; 4618 fdc_state[0].address = FDC1; 4619 if (fdc_state[0].address == -1) { 4620 cancel_delayed_work(&fd_timeout); 4621 err = -ENODEV; 4622 goto out_unreg_driver; 4623 } 4624 #if N_FDC > 1 4625 fdc_state[1].address = FDC2; 4626 #endif 4627 4628 current_fdc = 0; /* reset fdc in case of unexpected interrupt */ 4629 err = floppy_grab_irq_and_dma(); 4630 if (err) { 4631 cancel_delayed_work(&fd_timeout); 4632 err = -EBUSY; 4633 goto out_unreg_driver; 4634 } 4635 4636 /* initialise drive state */ 4637 for (drive = 0; drive < N_DRIVE; drive++) { 4638 memset(&drive_state[drive], 0, sizeof(drive_state[drive])); 4639 memset(&write_errors[drive], 0, sizeof(write_errors[drive])); 4640 set_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[drive].flags); 4641 set_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags); 4642 set_bit(FD_VERIFY_BIT, &drive_state[drive].flags); 4643 drive_state[drive].fd_device = -1; 4644 floppy_track_buffer = NULL; 4645 max_buffer_sectors = 0; 4646 } 4647 /* 4648 * Small 10 msec delay to let through any interrupt that 4649 * initialization might have triggered, to not 4650 * confuse detection: 4651 */ 4652 msleep(10); 4653 4654 for (i = 0; i < N_FDC; i++) { 4655 fdc_state[i].driver_version = FD_DRIVER_VERSION; 4656 for (unit = 0; unit < 4; unit++) 4657 fdc_state[i].track[unit] = 0; 4658 if (fdc_state[i].address == -1) 4659 continue; 4660 fdc_state[i].rawcmd = 2; 4661 if (user_reset_fdc(REVDRIVE(i, 0), FD_RESET_ALWAYS, false)) { 4662 /* free ioports reserved by floppy_grab_irq_and_dma() */ 4663 floppy_release_regions(i); 4664 fdc_state[i].address = -1; 4665 fdc_state[i].version = FDC_NONE; 4666 continue; 4667 } 4668 /* Try to determine the floppy controller type */ 4669 fdc_state[i].version = get_fdc_version(i); 4670 if (fdc_state[i].version == FDC_NONE) { 4671 /* free ioports reserved by floppy_grab_irq_and_dma() */ 4672 floppy_release_regions(i); 4673 fdc_state[i].address = -1; 4674 continue; 4675 } 4676 if (can_use_virtual_dma == 2 && 4677 fdc_state[i].version < FDC_82072A) 4678 can_use_virtual_dma = 0; 4679 4680 have_no_fdc = 0; 4681 /* Not all FDCs seem to be able to handle the version command 4682 * properly, so force a reset for the standard FDC clones, 4683 * to avoid interrupt garbage. 4684 */ 4685 user_reset_fdc(REVDRIVE(i, 0), FD_RESET_ALWAYS, false); 4686 } 4687 current_fdc = 0; 4688 cancel_delayed_work(&fd_timeout); 4689 current_drive = 0; 4690 initialized = true; 4691 if (have_no_fdc) { 4692 DPRINT("no floppy controllers found\n"); 4693 err = have_no_fdc; 4694 goto out_release_dma; 4695 } 4696 4697 for (drive = 0; drive < N_DRIVE; drive++) { 4698 if (!floppy_available(drive)) 4699 continue; 4700 4701 floppy_device[drive].name = floppy_device_name; 4702 floppy_device[drive].id = drive; 4703 floppy_device[drive].dev.release = floppy_device_release; 4704 floppy_device[drive].dev.groups = floppy_dev_groups; 4705 4706 err = platform_device_register(&floppy_device[drive]); 4707 if (err) 4708 goto out_remove_drives; 4709 4710 registered[drive] = true; 4711 4712 err = device_add_disk(&floppy_device[drive].dev, 4713 disks[drive][0], NULL); 4714 if (err) 4715 goto out_remove_drives; 4716 } 4717 4718 return 0; 4719 4720 out_remove_drives: 4721 while (drive--) { 4722 if (floppy_available(drive)) { 4723 del_gendisk(disks[drive][0]); 4724 if (registered[drive]) 4725 platform_device_unregister(&floppy_device[drive]); 4726 } 4727 } 4728 out_release_dma: 4729 if (atomic_read(&usage_count)) 4730 floppy_release_irq_and_dma(); 4731 out_unreg_driver: 4732 platform_driver_unregister(&floppy_driver); 4733 out_unreg_blkdev: 4734 unregister_blkdev(FLOPPY_MAJOR, "fd"); 4735 out_put_disk: 4736 destroy_workqueue(floppy_wq); 4737 for (drive = 0; drive < N_DRIVE; drive++) { 4738 if (!disks[drive][0]) 4739 break; 4740 del_timer_sync(&motor_off_timer[drive]); 4741 blk_cleanup_disk(disks[drive][0]); 4742 blk_mq_free_tag_set(&tag_sets[drive]); 4743 } 4744 return err; 4745 } 4746 4747 #ifndef MODULE 4748 static __init void floppy_async_init(void *data, async_cookie_t cookie) 4749 { 4750 do_floppy_init(); 4751 } 4752 #endif 4753 4754 static int __init floppy_init(void) 4755 { 4756 #ifdef MODULE 4757 return do_floppy_init(); 4758 #else 4759 /* Don't hold up the bootup by the floppy initialization */ 4760 async_schedule(floppy_async_init, NULL); 4761 return 0; 4762 #endif 4763 } 4764 4765 static const struct io_region { 4766 int offset; 4767 int size; 4768 } io_regions[] = { 4769 { 2, 1 }, 4770 /* address + 3 is sometimes reserved by pnp bios for motherboard */ 4771 { 4, 2 }, 4772 /* address + 6 is reserved, and may be taken by IDE. 4773 * Unfortunately, Adaptec doesn't know this :-(, */ 4774 { 7, 1 }, 4775 }; 4776 4777 static void floppy_release_allocated_regions(int fdc, const struct io_region *p) 4778 { 4779 while (p != io_regions) { 4780 p--; 4781 release_region(fdc_state[fdc].address + p->offset, p->size); 4782 } 4783 } 4784 4785 #define ARRAY_END(X) (&((X)[ARRAY_SIZE(X)])) 4786 4787 static int floppy_request_regions(int fdc) 4788 { 4789 const struct io_region *p; 4790 4791 for (p = io_regions; p < ARRAY_END(io_regions); p++) { 4792 if (!request_region(fdc_state[fdc].address + p->offset, 4793 p->size, "floppy")) { 4794 DPRINT("Floppy io-port 0x%04lx in use\n", 4795 fdc_state[fdc].address + p->offset); 4796 floppy_release_allocated_regions(fdc, p); 4797 return -EBUSY; 4798 } 4799 } 4800 return 0; 4801 } 4802 4803 static void floppy_release_regions(int fdc) 4804 { 4805 floppy_release_allocated_regions(fdc, ARRAY_END(io_regions)); 4806 } 4807 4808 static int floppy_grab_irq_and_dma(void) 4809 { 4810 int fdc; 4811 4812 if (atomic_inc_return(&usage_count) > 1) 4813 return 0; 4814 4815 /* 4816 * We might have scheduled a free_irq(), wait it to 4817 * drain first: 4818 */ 4819 flush_workqueue(floppy_wq); 4820 4821 if (fd_request_irq()) { 4822 DPRINT("Unable to grab IRQ%d for the floppy driver\n", 4823 FLOPPY_IRQ); 4824 atomic_dec(&usage_count); 4825 return -1; 4826 } 4827 if (fd_request_dma()) { 4828 DPRINT("Unable to grab DMA%d for the floppy driver\n", 4829 FLOPPY_DMA); 4830 if (can_use_virtual_dma & 2) 4831 use_virtual_dma = can_use_virtual_dma = 1; 4832 if (!(can_use_virtual_dma & 1)) { 4833 fd_free_irq(); 4834 atomic_dec(&usage_count); 4835 return -1; 4836 } 4837 } 4838 4839 for (fdc = 0; fdc < N_FDC; fdc++) { 4840 if (fdc_state[fdc].address != -1) { 4841 if (floppy_request_regions(fdc)) 4842 goto cleanup; 4843 } 4844 } 4845 for (fdc = 0; fdc < N_FDC; fdc++) { 4846 if (fdc_state[fdc].address != -1) { 4847 reset_fdc_info(fdc, 1); 4848 fdc_outb(fdc_state[fdc].dor, fdc, FD_DOR); 4849 } 4850 } 4851 4852 set_dor(0, ~0, 8); /* avoid immediate interrupt */ 4853 4854 for (fdc = 0; fdc < N_FDC; fdc++) 4855 if (fdc_state[fdc].address != -1) 4856 fdc_outb(fdc_state[fdc].dor, fdc, FD_DOR); 4857 /* 4858 * The driver will try and free resources and relies on us 4859 * to know if they were allocated or not. 4860 */ 4861 current_fdc = 0; 4862 irqdma_allocated = 1; 4863 return 0; 4864 cleanup: 4865 fd_free_irq(); 4866 fd_free_dma(); 4867 while (--fdc >= 0) 4868 floppy_release_regions(fdc); 4869 current_fdc = 0; 4870 atomic_dec(&usage_count); 4871 return -1; 4872 } 4873 4874 static void floppy_release_irq_and_dma(void) 4875 { 4876 int fdc; 4877 #ifndef __sparc__ 4878 int drive; 4879 #endif 4880 long tmpsize; 4881 unsigned long tmpaddr; 4882 4883 if (!atomic_dec_and_test(&usage_count)) 4884 return; 4885 4886 if (irqdma_allocated) { 4887 fd_disable_dma(); 4888 fd_free_dma(); 4889 fd_free_irq(); 4890 irqdma_allocated = 0; 4891 } 4892 set_dor(0, ~0, 8); 4893 #if N_FDC > 1 4894 set_dor(1, ~8, 0); 4895 #endif 4896 4897 if (floppy_track_buffer && max_buffer_sectors) { 4898 tmpsize = max_buffer_sectors * 1024; 4899 tmpaddr = (unsigned long)floppy_track_buffer; 4900 floppy_track_buffer = NULL; 4901 max_buffer_sectors = 0; 4902 buffer_min = buffer_max = -1; 4903 fd_dma_mem_free(tmpaddr, tmpsize); 4904 } 4905 #ifndef __sparc__ 4906 for (drive = 0; drive < N_FDC * 4; drive++) 4907 if (timer_pending(motor_off_timer + drive)) 4908 pr_info("motor off timer %d still active\n", drive); 4909 #endif 4910 4911 if (delayed_work_pending(&fd_timeout)) 4912 pr_info("floppy timer still active:%s\n", timeout_message); 4913 if (delayed_work_pending(&fd_timer)) 4914 pr_info("auxiliary floppy timer still active\n"); 4915 if (work_pending(&floppy_work)) 4916 pr_info("work still pending\n"); 4917 for (fdc = 0; fdc < N_FDC; fdc++) 4918 if (fdc_state[fdc].address != -1) 4919 floppy_release_regions(fdc); 4920 } 4921 4922 #ifdef MODULE 4923 4924 static char *floppy; 4925 4926 static void __init parse_floppy_cfg_string(char *cfg) 4927 { 4928 char *ptr; 4929 4930 while (*cfg) { 4931 ptr = cfg; 4932 while (*cfg && *cfg != ' ' && *cfg != '\t') 4933 cfg++; 4934 if (*cfg) { 4935 *cfg = '\0'; 4936 cfg++; 4937 } 4938 if (*ptr) 4939 floppy_setup(ptr); 4940 } 4941 } 4942 4943 static int __init floppy_module_init(void) 4944 { 4945 if (floppy) 4946 parse_floppy_cfg_string(floppy); 4947 return floppy_init(); 4948 } 4949 module_init(floppy_module_init); 4950 4951 static void __exit floppy_module_exit(void) 4952 { 4953 int drive, i; 4954 4955 unregister_blkdev(FLOPPY_MAJOR, "fd"); 4956 platform_driver_unregister(&floppy_driver); 4957 4958 destroy_workqueue(floppy_wq); 4959 4960 for (drive = 0; drive < N_DRIVE; drive++) { 4961 del_timer_sync(&motor_off_timer[drive]); 4962 4963 if (floppy_available(drive)) { 4964 for (i = 0; i < ARRAY_SIZE(floppy_type); i++) { 4965 if (disks[drive][i]) 4966 del_gendisk(disks[drive][i]); 4967 } 4968 if (registered[drive]) 4969 platform_device_unregister(&floppy_device[drive]); 4970 } 4971 for (i = 0; i < ARRAY_SIZE(floppy_type); i++) { 4972 if (disks[drive][i]) 4973 blk_cleanup_disk(disks[drive][i]); 4974 } 4975 blk_mq_free_tag_set(&tag_sets[drive]); 4976 } 4977 4978 cancel_delayed_work_sync(&fd_timeout); 4979 cancel_delayed_work_sync(&fd_timer); 4980 4981 if (atomic_read(&usage_count)) 4982 floppy_release_irq_and_dma(); 4983 4984 /* eject disk, if any */ 4985 fd_eject(0); 4986 } 4987 4988 module_exit(floppy_module_exit); 4989 4990 module_param(floppy, charp, 0); 4991 module_param(FLOPPY_IRQ, int, 0); 4992 module_param(FLOPPY_DMA, int, 0); 4993 MODULE_AUTHOR("Alain L. Knaff"); 4994 MODULE_LICENSE("GPL"); 4995 4996 /* This doesn't actually get used other than for module information */ 4997 static const struct pnp_device_id floppy_pnpids[] = { 4998 {"PNP0700", 0}, 4999 {} 5000 }; 5001 5002 MODULE_DEVICE_TABLE(pnp, floppy_pnpids); 5003 5004 #else 5005 5006 __setup("floppy=", floppy_setup); 5007 module_init(floppy_init) 5008 #endif 5009 5010 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR); 5011