2 * linux/drivers/block/floppy.c
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 * Copyright (C) 1993, 1994 Alain Knaff
6 * Copyright (C) 1998 Alan Cox
10 * 02.12.91 - Changed to static variables to indicate need for reset
11 * and recalibrate. This makes some things easier (output_byte reset
12 * checking etc), and means less interrupt jumping in case of errors,
13 * so the code is hopefully easier to understand.
17 * This file is certainly a mess. I've tried my best to get it working,
18 * but I don't like programming floppies, and I have only one anyway.
19 * Urgel. I should check for more errors, and do more graceful error
20 * recovery. Seems there are problems with several drives. I've tried to
21 * correct them. No promises.
25 * As with hd.c, all routines within this file can (and will) be called
26 * by interrupts, so extreme caution is needed. A hardware interrupt
27 * handler may not sleep, or a kernel panic will happen. Thus I cannot
28 * call "floppy-on" directly, but have to set a special timer interrupt
33 * 28.02.92 - made track-buffering routines, based on the routines written
34 * by entropy@wintermute.wpi.edu (Lawrence Foard). Linus.
38 * Automatic floppy-detection and formatting written by Werner Almesberger
39 * (almesber@nessie.cs.id.ethz.ch), who also corrected some problems with
40 * the floppy-change signal detection.
44 * 1992/7/22 -- Hennus Bergman: Added better error reporting, fixed
45 * FDC data overrun bug, added some preliminary stuff for vertical
48 * 1992/9/17: Added DMA allocation & DMA functions. -- hhb.
50 * TODO: Errors are still not counted properly.
54 * Modifications for ``Sector Shifting'' by Rob Hooft (hooft@chem.ruu.nl)
55 * modeled after the freeware MS-DOS program fdformat/88 V1.8 by
56 * Christoph H. Hochst\"atter.
57 * I have fixed the shift values to the ones I always use. Maybe a new
58 * ioctl() should be created to be able to modify them.
59 * There is a bug in the driver that makes it impossible to format a
60 * floppy as the first thing after bootup.
64 * 1993/4/29 -- Linus -- cleaned up the timer handling in the kernel, and
65 * this helped the floppy driver as well. Much cleaner, and still seems to
69 /* 1994/6/24 --bbroad-- added the floppy table entries and made
70 * minor modifications to allow 2.88 floppies to be run.
73 /* 1994/7/13 -- Paul Vojta -- modified the probing code to allow three or more
78 * 1994/8/8 -- Alain Knaff -- Switched to fdpatch driver: Support for bigger
79 * format bug fixes, but unfortunately some new bugs too...
82 /* 1994/9/17 -- Koen Holtman -- added logging of physical floppy write
83 * errors to allow safe writing by specialized programs.
86 /* 1995/4/24 -- Dan Fandrich -- added support for Commodore 1581 3.5" disks
87 * by defining bit 1 of the "stretch" parameter to mean put sectors on the
88 * opposite side of the disk, leaving the sector IDs alone (i.e. Commodore's
89 * drives are "upside-down").
93 * 1995/8/26 -- Andreas Busse -- added Mips support.
97 * 1995/10/18 -- Ralf Baechle -- Portability cleanup; move machine dependent
98 * features to asm/floppy.h.
102 * 1998/1/21 -- Richard Gooch <rgooch@atnf.csiro.au> -- devfs support
106 * 1998/05/07 -- Russell King -- More portability cleanups; moved definition of
107 * interrupt and dma channel to asm/floppy.h. Cleaned up some formatting &
108 * use of '0' for NULL.
112 * 1998/06/07 -- Alan Cox -- Merged the 2.0.34 fixes for resource allocation
117 * 1998/09/20 -- David Weinehall -- Added slow-down code for buggy PS/2-drives.
121 * 1999/08/13 -- Paul Slootman -- floppy stopped working on Alpha after 24
122 * days, 6 hours, 32 minutes and 32 seconds (i.e. MAXINT jiffies; ints were
123 * being used to store jiffies, which are unsigned longs).
127 * 2000/08/28 -- Arnaldo Carvalho de Melo <acme@conectiva.com.br>
128 * - get rid of check_region
133 * 2001/08/26 -- Paul Gortmaker - fix insmod oops on machines with no
134 * floppy controller (lingering task on list after module is gone... boom.)
138 * 2002/02/07 -- Anton Altaparmakov - Fix io ports reservation to correct range
139 * (0x3f2-0x3f5, 0x3f7). This fix is a bit of a hack but the proper fix
140 * requires many non-obvious changes in arch dependent code.
143 /* 2003/07/28 -- Daniele Bellucci <bellucda@tiscali.it>.
144 * Better audit of register_blkdev.
147 #undef FLOPPY_SILENT_DCL_CLEAR
149 #define REALLY_SLOW_IO
153 #define DPRINT(format, args...) \
154 pr_info("floppy%d: " format, current_drive, ##args)
156 #define DCL_DEBUG /* debug disk change line */
158 #define debug_dcl(test, fmt, args...) \
159 do { if ((test) & FD_DEBUG) DPRINT(fmt, ##args); } while (0)
161 #define debug_dcl(test, fmt, args...) \
162 do { if (0) DPRINT(fmt, ##args); } while (0)
165 /* do print messages for unexpected interrupts */
166 static int print_unex = 1;
167 #include <linux/module.h>
168 #include <linux/sched.h>
169 #include <linux/fs.h>
170 #include <linux/kernel.h>
171 #include <linux/timer.h>
172 #include <linux/workqueue.h>
174 #include <linux/fdreg.h>
175 #include <linux/fd.h>
176 #include <linux/hdreg.h>
177 #include <linux/errno.h>
178 #include <linux/slab.h>
179 #include <linux/mm.h>
180 #include <linux/bio.h>
181 #include <linux/string.h>
182 #include <linux/jiffies.h>
183 #include <linux/fcntl.h>
184 #include <linux/delay.h>
185 #include <linux/mc146818rtc.h> /* CMOS defines */
186 #include <linux/ioport.h>
187 #include <linux/interrupt.h>
188 #include <linux/init.h>
189 #include <linux/platform_device.h>
190 #include <linux/mod_devicetable.h>
191 #include <linux/mutex.h>
192 #include <linux/io.h>
193 #include <linux/uaccess.h>
196 * PS/2 floppies have much slower step rates than regular floppies.
197 * It's been recommended that take about 1/4 of the default speed
198 * in some more extreme cases.
200 static DEFINE_MUTEX(floppy_mutex);
201 static int slow_floppy;
205 #include <asm/system.h>
207 static int FLOPPY_IRQ = 6;
208 static int FLOPPY_DMA = 2;
209 static int can_use_virtual_dma = 2;
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
218 static int use_virtual_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
230 static DEFINE_SPINLOCK(floppy_lock);
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);
236 #define K_64 0x10000 /* 64KB */
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.
244 * NOTE: This must come before we include the arch floppy header because
245 * some ports reference this variable from there. -DaveM
248 static int allowed_drive_mask = 0x33;
250 #include <asm/floppy.h>
252 static int irqdma_allocated;
254 #include <linux/blkdev.h>
255 #include <linux/blkpg.h>
256 #include <linux/cdrom.h> /* for the compatibility eject ioctl */
257 #include <linux/completion.h>
259 static struct request *current_req;
260 static void do_fd_request(struct request_queue *q);
261 static int set_next_request(void);
263 #ifndef fd_get_dma_residue
264 #define fd_get_dma_residue() get_dma_residue(FLOPPY_DMA)
267 /* Dma Memory related stuff */
269 #ifndef fd_dma_mem_free
270 #define fd_dma_mem_free(addr, size) free_pages(addr, get_order(size))
273 #ifndef fd_dma_mem_alloc
274 #define fd_dma_mem_alloc(size) __get_dma_pages(GFP_KERNEL, get_order(size))
277 static inline void fallback_on_nodma_alloc(char **addr, size_t l)
279 #ifdef FLOPPY_CAN_FALLBACK_ON_NODMA
281 return; /* we have the memory */
282 if (can_use_virtual_dma != 2)
283 return; /* no fallback allowed */
284 pr_info("DMA memory shortage. Temporarily falling back on virtual DMA\n");
285 *addr = (char *)nodma_mem_alloc(l);
291 /* End dma memory related stuff */
293 static unsigned long fake_change;
294 static bool initialized;
296 #define ITYPE(x) (((x) >> 2) & 0x1f)
297 #define TOMINOR(x) ((x & 3) | ((x & 4) << 5))
298 #define UNIT(x) ((x) & 0x03) /* drive on fdc */
299 #define FDC(x) (((x) & 0x04) >> 2) /* fdc of drive */
300 /* reverse mapping from unit and fdc to drive */
301 #define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2))
303 #define DP (&drive_params[current_drive])
304 #define DRS (&drive_state[current_drive])
305 #define DRWE (&write_errors[current_drive])
306 #define FDCS (&fdc_state[fdc])
308 #define UDP (&drive_params[drive])
309 #define UDRS (&drive_state[drive])
310 #define UDRWE (&write_errors[drive])
311 #define UFDCS (&fdc_state[FDC(drive)])
313 #define PH_HEAD(floppy, head) (((((floppy)->stretch & 2) >> 1) ^ head) << 2)
314 #define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH)
317 #define COMMAND (raw_cmd->cmd[0])
318 #define DR_SELECT (raw_cmd->cmd[1])
319 #define TRACK (raw_cmd->cmd[2])
320 #define HEAD (raw_cmd->cmd[3])
321 #define SECTOR (raw_cmd->cmd[4])
322 #define SIZECODE (raw_cmd->cmd[5])
323 #define SECT_PER_TRACK (raw_cmd->cmd[6])
324 #define GAP (raw_cmd->cmd[7])
325 #define SIZECODE2 (raw_cmd->cmd[8])
329 #define F_SIZECODE (raw_cmd->cmd[2])
330 #define F_SECT_PER_TRACK (raw_cmd->cmd[3])
331 #define F_GAP (raw_cmd->cmd[4])
332 #define F_FILL (raw_cmd->cmd[5])
336 * Maximum disk size (in kilobytes).
337 * This default is used whenever the current disk size is unknown.
338 * [Now it is rather a minimum]
340 #define MAX_DISK_SIZE 4 /* 3984 */
343 * globals used by 'result()'
345 #define MAX_REPLIES 16
346 static unsigned char reply_buffer[MAX_REPLIES];
347 static int inr; /* size of reply buffer, when called from interrupt */
348 #define ST0 (reply_buffer[0])
349 #define ST1 (reply_buffer[1])
350 #define ST2 (reply_buffer[2])
351 #define ST3 (reply_buffer[0]) /* result of GETSTATUS */
352 #define R_TRACK (reply_buffer[3])
353 #define R_HEAD (reply_buffer[4])
354 #define R_SECTOR (reply_buffer[5])
355 #define R_SIZECODE (reply_buffer[6])
357 #define SEL_DLY (2 * HZ / 100)
360 * this struct defines the different floppy drive types.
363 struct floppy_drive_params params;
364 const char *name; /* name printed while booting */
365 } default_drive_params[] = {
366 /* NOTE: the time values in jiffies should be in msec!
368 | Maximum data rate supported by drive type
369 | | Head load time, msec
370 | | | Head unload time, msec (not used)
371 | | | | Step rate interval, usec
372 | | | | | Time needed for spinup time (jiffies)
373 | | | | | | Timeout for spinning down (jiffies)
374 | | | | | | | Spindown offset (where disk stops)
375 | | | | | | | | Select delay
376 | | | | | | | | | RPS
377 | | | | | | | | | | Max number of tracks
378 | | | | | | | | | | | Interrupt timeout
379 | | | | | | | | | | | | Max nonintlv. sectors
380 | | | | | | | | | | | | | -Max Errors- flags */
381 {{0, 500, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 80, 3*HZ, 20, {3,1,2,0,2}, 0,
382 0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" },
384 {{1, 300, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 40, 3*HZ, 17, {3,1,2,0,2}, 0,
385 0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
387 {{2, 500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6, 83, 3*HZ, 17, {3,1,2,0,2}, 0,
388 0, { 2, 5, 6,23,10,20,12, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/
390 {{3, 250, 16, 16, 3000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0,
391 0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/
393 {{4, 500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0,
394 0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/
396 {{5, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0,
397 0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
399 {{6, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0,
400 0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/
401 /* | --autodetected formats--- | | |
402 * read_track | | Name printed when booting
404 * Frequency of disk change checks */
407 static struct floppy_drive_params drive_params[N_DRIVE];
408 static struct floppy_drive_struct drive_state[N_DRIVE];
409 static struct floppy_write_errors write_errors[N_DRIVE];
410 static struct timer_list motor_off_timer[N_DRIVE];
411 static struct gendisk *disks[N_DRIVE];
412 static struct block_device *opened_bdev[N_DRIVE];
413 static DEFINE_MUTEX(open_lock);
414 static struct floppy_raw_cmd *raw_cmd, default_raw_cmd;
415 static int fdc_queue;
418 * This struct defines the different floppy types.
420 * Bit 0 of 'stretch' tells if the tracks need to be doubled for some
421 * types (e.g. 360kB diskette in 1.2MB drive, etc.). Bit 1 of 'stretch'
422 * tells if the disk is in Commodore 1581 format, which means side 0 sectors
423 * are located on side 1 of the disk but with a side 0 ID, and vice-versa.
424 * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
425 * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
426 * side 0 is on physical side 0 (but with the misnamed sector IDs).
427 * 'stretch' should probably be renamed to something more general, like
430 * Bits 2 through 9 of 'stretch' tell the number of the first sector.
431 * The LSB (bit 2) is flipped. For most disks, the first sector
432 * is 1 (represented by 0x00<<2). For some CP/M and music sampler
433 * disks (such as Ensoniq EPS 16plus) it is 0 (represented as 0x01<<2).
434 * For Amstrad CPC disks it is 0xC1 (represented as 0xC0<<2).
436 * Other parameters should be self-explanatory (see also setfdprm(8)).
445 | | | | | | Data rate, | 0x40 for perp
446 | | | | | | | Spec1 (stepping rate, head unload
447 | | | | | | | | /fmt gap (gap2) */
448 static struct floppy_struct floppy_type[32] = {
449 { 0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL }, /* 0 no testing */
450 { 720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360" }, /* 1 360KB PC */
451 { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /* 2 1.2MB AT */
452 { 720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360" }, /* 3 360KB SS 3.5" */
453 { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720" }, /* 4 720KB 3.5" */
454 { 720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360" }, /* 5 360KB AT */
455 { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720" }, /* 6 720KB AT */
456 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /* 7 1.44MB 3.5" */
457 { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /* 8 2.88MB 3.5" */
458 { 6240,39,2,80,0,0x1B,0x43,0xAF,0x28,"E3120" }, /* 9 3.12MB 3.5" */
460 { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25" */
461 { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5" */
462 { 820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410" }, /* 12 410KB 5.25" */
463 { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820" }, /* 13 820KB 3.5" */
464 { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25" */
465 { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5" */
466 { 840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420" }, /* 16 420KB 5.25" */
467 { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830" }, /* 17 830KB 3.5" */
468 { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25" */
469 { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5" */
471 { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880" }, /* 20 880KB 5.25" */
472 { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5" */
473 { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5" */
474 { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25" */
475 { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5" */
476 { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5" */
477 { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5" */
478 { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5" */
479 { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5" */
480 { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5" */
482 { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800" }, /* 30 800KB 3.5" */
483 { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5" */
486 #define SECTSIZE (_FD_SECTSIZE(*floppy))
488 /* Auto-detection: Disk type used until the next media change occurs. */
489 static struct floppy_struct *current_type[N_DRIVE];
492 * User-provided type information. current_type points to
493 * the respective entry of this array.
495 static struct floppy_struct user_params[N_DRIVE];
497 static sector_t floppy_sizes[256];
499 static char floppy_device_name[] = "floppy";
502 * The driver is trying to determine the correct media format
503 * while probing is set. rw_interrupt() clears it after a
508 /* Synchronization of FDC access. */
509 #define FD_COMMAND_NONE -1
510 #define FD_COMMAND_ERROR 2
511 #define FD_COMMAND_OKAY 3
513 static volatile int command_status = FD_COMMAND_NONE;
514 static unsigned long fdc_busy;
515 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
516 static DECLARE_WAIT_QUEUE_HEAD(command_done);
518 /* Errors during formatting are counted here. */
519 static int format_errors;
521 /* Format request descriptor. */
522 static struct format_descr format_req;
525 * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
526 * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
527 * H is head unload time (1=16ms, 2=32ms, etc)
532 * Because these are written to by the DMA controller, they must
533 * not contain a 64k byte boundary crossing, or data will be
536 static char *floppy_track_buffer;
537 static int max_buffer_sectors;
540 typedef void (*done_f)(int);
541 static const struct cont_t {
542 void (*interrupt)(void);
543 /* this is called after the interrupt of the
545 void (*redo)(void); /* this is called to retry the operation */
546 void (*error)(void); /* this is called to tally an error */
547 done_f done; /* this is called to say if the operation has
548 * succeeded/failed */
551 static void floppy_ready(void);
552 static void floppy_start(void);
553 static void process_fd_request(void);
554 static void recalibrate_floppy(void);
555 static void floppy_shutdown(unsigned long);
557 static int floppy_request_regions(int);
558 static void floppy_release_regions(int);
559 static int floppy_grab_irq_and_dma(void);
560 static void floppy_release_irq_and_dma(void);
563 * The "reset" variable should be tested whenever an interrupt is scheduled,
564 * after the commands have been sent. This is to ensure that the driver doesn't
565 * get wedged when the interrupt doesn't come because of a failed command.
566 * reset doesn't need to be tested before sending commands, because
567 * output_byte is automatically disabled when reset is set.
569 static void reset_fdc(void);
572 * These are global variables, as that's the easiest way to give
573 * information to interrupts. They are the data used for the current
577 #define NEED_1_RECAL -2
578 #define NEED_2_RECAL -3
580 static atomic_t usage_count = ATOMIC_INIT(0);
582 /* buffer related variables */
583 static int buffer_track = -1;
584 static int buffer_drive = -1;
585 static int buffer_min = -1;
586 static int buffer_max = -1;
588 /* fdc related variables, should end up in a struct */
589 static struct floppy_fdc_state fdc_state[N_FDC];
590 static int fdc; /* current fdc */
592 static struct floppy_struct *_floppy = floppy_type;
593 static unsigned char current_drive;
594 static long current_count_sectors;
595 static unsigned char fsector_t; /* sector in track */
596 static unsigned char in_sector_offset; /* offset within physical sector,
597 * expressed in units of 512 bytes */
599 static inline bool drive_no_geom(int drive)
601 return !current_type[drive] && !ITYPE(UDRS->fd_device);
605 static inline int fd_eject(int drive)
616 static long unsigned debugtimer;
618 static inline void set_debugt(void)
620 debugtimer = jiffies;
623 static inline void debugt(const char *func, const char *msg)
625 if (DP->flags & DEBUGT)
626 pr_info("%s:%s dtime=%lu\n", func, msg, jiffies - debugtimer);
629 static inline void set_debugt(void) { }
630 static inline void debugt(const char *func, const char *msg) { }
633 typedef void (*timeout_fn)(unsigned long);
634 static DEFINE_TIMER(fd_timeout, floppy_shutdown, 0, 0);
636 static const char *timeout_message;
638 static void is_alive(const char *func, const char *message)
640 /* this routine checks whether the floppy driver is "alive" */
641 if (test_bit(0, &fdc_busy) && command_status < 2 &&
642 !timer_pending(&fd_timeout)) {
643 DPRINT("%s: timeout handler died. %s\n", func, message);
647 static void (*do_floppy)(void) = NULL;
651 static void (*lasthandler)(void);
652 static unsigned long interruptjiffies;
653 static unsigned long resultjiffies;
654 static int resultsize;
655 static unsigned long lastredo;
657 static struct output_log {
659 unsigned char status;
660 unsigned long jiffies;
661 } output_log[OLOGSIZE];
663 static int output_log_pos;
665 #define current_reqD -1
666 #define MAXTIMEOUT -2
668 static void __reschedule_timeout(int drive, const char *message)
670 if (drive == current_reqD)
671 drive = current_drive;
672 del_timer(&fd_timeout);
673 if (drive < 0 || drive >= N_DRIVE) {
674 fd_timeout.expires = jiffies + 20UL * HZ;
677 fd_timeout.expires = jiffies + UDP->timeout;
678 add_timer(&fd_timeout);
679 if (UDP->flags & FD_DEBUG)
680 DPRINT("reschedule timeout %s\n", message);
681 timeout_message = message;
684 static void reschedule_timeout(int drive, const char *message)
688 spin_lock_irqsave(&floppy_lock, flags);
689 __reschedule_timeout(drive, message);
690 spin_unlock_irqrestore(&floppy_lock, flags);
693 #define INFBOUND(a, b) (a) = max_t(int, a, b)
694 #define SUPBOUND(a, b) (a) = min_t(int, a, b)
697 * Bottom half floppy driver.
698 * ==========================
700 * This part of the file contains the code talking directly to the hardware,
701 * and also the main service loop (seek-configure-spinup-command)
706 * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
707 * and the last_checked date.
709 * last_checked is the date of the last check which showed 'no disk change'
710 * FD_DISK_CHANGE is set under two conditions:
711 * 1. The floppy has been changed after some i/o to that floppy already
713 * 2. No floppy disk is in the drive. This is done in order to ensure that
714 * requests are quickly flushed in case there is no disk in the drive. It
715 * follows that FD_DISK_CHANGE can only be cleared if there is a disk in
718 * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
719 * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
720 * each seek. If a disk is present, the disk change line should also be
721 * cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
722 * change line is set, this means either that no disk is in the drive, or
723 * that it has been removed since the last seek.
725 * This means that we really have a third possibility too:
726 * The floppy has been changed after the last seek.
729 static int disk_change(int drive)
731 int fdc = FDC(drive);
733 if (time_before(jiffies, UDRS->select_date + UDP->select_delay))
734 DPRINT("WARNING disk change called early\n");
735 if (!(FDCS->dor & (0x10 << UNIT(drive))) ||
736 (FDCS->dor & 3) != UNIT(drive) || fdc != FDC(drive)) {
737 DPRINT("probing disk change on unselected drive\n");
738 DPRINT("drive=%d fdc=%d dor=%x\n", drive, FDC(drive),
739 (unsigned int)FDCS->dor);
742 debug_dcl(UDP->flags,
743 "checking disk change line for drive %d\n", drive);
744 debug_dcl(UDP->flags, "jiffies=%lu\n", jiffies);
745 debug_dcl(UDP->flags, "disk change line=%x\n", fd_inb(FD_DIR) & 0x80);
746 debug_dcl(UDP->flags, "flags=%lx\n", UDRS->flags);
748 if (UDP->flags & FD_BROKEN_DCL)
749 return test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
750 if ((fd_inb(FD_DIR) ^ UDP->flags) & 0x80) {
751 set_bit(FD_VERIFY_BIT, &UDRS->flags);
752 /* verify write protection */
754 if (UDRS->maxblock) /* mark it changed */
755 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
757 /* invalidate its geometry */
758 if (UDRS->keep_data >= 0) {
759 if ((UDP->flags & FTD_MSG) &&
760 current_type[drive] != NULL)
761 DPRINT("Disk type is undefined after disk change\n");
762 current_type[drive] = NULL;
763 floppy_sizes[TOMINOR(drive)] = MAX_DISK_SIZE << 1;
768 UDRS->last_checked = jiffies;
769 clear_bit(FD_DISK_NEWCHANGE_BIT, &UDRS->flags);
774 static inline int is_selected(int dor, int unit)
776 return ((dor & (0x10 << unit)) && (dor & 3) == unit);
779 static bool is_ready_state(int status)
781 int state = status & (STATUS_READY | STATUS_DIR | STATUS_DMA);
782 return state == STATUS_READY;
785 static int set_dor(int fdc, char mask, char data)
789 unsigned char newdor;
790 unsigned char olddor;
792 if (FDCS->address == -1)
796 newdor = (olddor & mask) | data;
797 if (newdor != olddor) {
799 if (is_selected(olddor, unit) && !is_selected(newdor, unit)) {
800 drive = REVDRIVE(fdc, unit);
801 debug_dcl(UDP->flags,
802 "calling disk change from set_dor\n");
806 fd_outb(newdor, FD_DOR);
809 if (!is_selected(olddor, unit) && is_selected(newdor, unit)) {
810 drive = REVDRIVE(fdc, unit);
811 UDRS->select_date = jiffies;
817 static void twaddle(void)
819 if (DP->select_delay)
821 fd_outb(FDCS->dor & ~(0x10 << UNIT(current_drive)), FD_DOR);
822 fd_outb(FDCS->dor, FD_DOR);
823 DRS->select_date = jiffies;
827 * Reset all driver information about the current fdc.
828 * This is needed after a reset, and after a raw command.
830 static void reset_fdc_info(int mode)
834 FDCS->spec1 = FDCS->spec2 = -1;
835 FDCS->need_configure = 1;
838 for (drive = 0; drive < N_DRIVE; drive++)
839 if (FDC(drive) == fdc && (mode || UDRS->track != NEED_1_RECAL))
840 UDRS->track = NEED_2_RECAL;
843 /* selects the fdc and drive, and enables the fdc's input/dma. */
844 static void set_fdc(int drive)
846 if (drive >= 0 && drive < N_DRIVE) {
848 current_drive = drive;
850 if (fdc != 1 && fdc != 0) {
851 pr_info("bad fdc value\n");
856 set_dor(1 - fdc, ~8, 0);
858 if (FDCS->rawcmd == 2)
860 if (fd_inb(FD_STATUS) != STATUS_READY)
864 /* locks the driver */
865 static int lock_fdc(int drive, bool interruptible)
867 if (WARN(atomic_read(&usage_count) == 0,
868 "Trying to lock fdc while usage count=0\n"))
871 if (wait_event_interruptible(fdc_wait, !test_and_set_bit(0, &fdc_busy)))
874 command_status = FD_COMMAND_NONE;
876 __reschedule_timeout(drive, "lock fdc");
881 /* unlocks the driver */
882 static void unlock_fdc(void)
887 if (!test_bit(0, &fdc_busy))
888 DPRINT("FDC access conflict!\n");
891 DPRINT("device interrupt still active at FDC release: %pf!\n",
893 command_status = FD_COMMAND_NONE;
894 spin_lock_irqsave(&floppy_lock, flags);
895 del_timer(&fd_timeout);
897 clear_bit(0, &fdc_busy);
898 if (current_req || set_next_request())
899 do_fd_request(current_req->q);
900 spin_unlock_irqrestore(&floppy_lock, flags);
904 /* switches the motor off after a given timeout */
905 static void motor_off_callback(unsigned long nr)
907 unsigned char mask = ~(0x10 << UNIT(nr));
909 set_dor(FDC(nr), mask, 0);
912 /* schedules motor off */
913 static void floppy_off(unsigned int drive)
915 unsigned long volatile delta;
916 int fdc = FDC(drive);
918 if (!(FDCS->dor & (0x10 << UNIT(drive))))
921 del_timer(motor_off_timer + drive);
923 /* make spindle stop in a position which minimizes spinup time
926 delta = jiffies - UDRS->first_read_date + HZ -
927 UDP->spindown_offset;
928 delta = ((delta * UDP->rps) % HZ) / UDP->rps;
929 motor_off_timer[drive].expires =
930 jiffies + UDP->spindown - delta;
932 add_timer(motor_off_timer + drive);
936 * cycle through all N_DRIVE floppy drives, for disk change testing.
937 * stopping at current drive. This is done before any long operation, to
938 * be sure to have up to date disk change information.
940 static void scandrives(void)
946 if (DP->select_delay)
949 saved_drive = current_drive;
950 for (i = 0; i < N_DRIVE; i++) {
951 drive = (saved_drive + i + 1) % N_DRIVE;
952 if (UDRS->fd_ref == 0 || UDP->select_delay != 0)
953 continue; /* skip closed drives */
955 if (!(set_dor(fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) &
956 (0x10 << UNIT(drive))))
957 /* switch the motor off again, if it was off to
959 set_dor(fdc, ~(0x10 << UNIT(drive)), 0);
961 set_fdc(saved_drive);
964 static void empty(void)
968 static DECLARE_WORK(floppy_work, NULL);
970 static void schedule_bh(void (*handler)(void))
972 PREPARE_WORK(&floppy_work, (work_func_t)handler);
973 schedule_work(&floppy_work);
976 static DEFINE_TIMER(fd_timer, NULL, 0, 0);
978 static void cancel_activity(void)
982 spin_lock_irqsave(&floppy_lock, flags);
984 PREPARE_WORK(&floppy_work, (work_func_t)empty);
985 del_timer(&fd_timer);
986 spin_unlock_irqrestore(&floppy_lock, flags);
989 /* this function makes sure that the disk stays in the drive during the
991 static void fd_watchdog(void)
993 debug_dcl(DP->flags, "calling disk change from watchdog\n");
995 if (disk_change(current_drive)) {
996 DPRINT("disk removed during i/o\n");
1001 del_timer(&fd_timer);
1002 fd_timer.function = (timeout_fn)fd_watchdog;
1003 fd_timer.expires = jiffies + HZ / 10;
1004 add_timer(&fd_timer);
1008 static void main_command_interrupt(void)
1010 del_timer(&fd_timer);
1014 /* waits for a delay (spinup or select) to pass */
1015 static int fd_wait_for_completion(unsigned long delay, timeout_fn function)
1018 reset_fdc(); /* do the reset during sleep to win time
1019 * if we don't need to sleep, it's a good
1020 * occasion anyways */
1024 if (time_before(jiffies, delay)) {
1025 del_timer(&fd_timer);
1026 fd_timer.function = function;
1027 fd_timer.expires = delay;
1028 add_timer(&fd_timer);
1034 static DEFINE_SPINLOCK(floppy_hlt_lock);
1035 static int hlt_disabled;
1036 static void floppy_disable_hlt(void)
1038 unsigned long flags;
1040 WARN_ONCE(1, "floppy_disable_hlt() scheduled for removal in 2012");
1041 spin_lock_irqsave(&floppy_hlt_lock, flags);
1042 if (!hlt_disabled) {
1044 #ifdef HAVE_DISABLE_HLT
1048 spin_unlock_irqrestore(&floppy_hlt_lock, flags);
1051 static void floppy_enable_hlt(void)
1053 unsigned long flags;
1055 spin_lock_irqsave(&floppy_hlt_lock, flags);
1058 #ifdef HAVE_DISABLE_HLT
1062 spin_unlock_irqrestore(&floppy_hlt_lock, flags);
1065 static void setup_DMA(void)
1069 if (raw_cmd->length == 0) {
1072 pr_info("zero dma transfer size:");
1073 for (i = 0; i < raw_cmd->cmd_count; i++)
1074 pr_cont("%x,", raw_cmd->cmd[i]);
1080 if (((unsigned long)raw_cmd->kernel_data) % 512) {
1081 pr_info("non aligned address: %p\n", raw_cmd->kernel_data);
1086 f = claim_dma_lock();
1089 if (fd_dma_setup(raw_cmd->kernel_data, raw_cmd->length,
1090 (raw_cmd->flags & FD_RAW_READ) ?
1091 DMA_MODE_READ : DMA_MODE_WRITE, FDCS->address) < 0) {
1092 release_dma_lock(f);
1097 release_dma_lock(f);
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 = FDCS->address;
1107 release_dma_lock(f);
1109 floppy_disable_hlt();
1112 static void show_floppy(void);
1114 /* waits until the fdc becomes ready */
1115 static int wait_til_ready(void)
1122 for (counter = 0; counter < 10000; counter++) {
1123 status = fd_inb(FD_STATUS);
1124 if (status & STATUS_READY)
1128 DPRINT("Getstatus times out (%x) on fdc %d\n", status, fdc);
1135 /* sends a command byte to the fdc */
1136 static int output_byte(char byte)
1138 int status = wait_til_ready();
1143 if (is_ready_state(status)) {
1144 fd_outb(byte, FD_DATA);
1145 output_log[output_log_pos].data = byte;
1146 output_log[output_log_pos].status = status;
1147 output_log[output_log_pos].jiffies = jiffies;
1148 output_log_pos = (output_log_pos + 1) % OLOGSIZE;
1153 DPRINT("Unable to send byte %x to FDC. Fdc=%x Status=%x\n",
1160 /* gets the response from the fdc */
1161 static int result(void)
1166 for (i = 0; i < MAX_REPLIES; i++) {
1167 status = wait_til_ready();
1170 status &= STATUS_DIR | STATUS_READY | STATUS_BUSY | STATUS_DMA;
1171 if ((status & ~STATUS_BUSY) == STATUS_READY) {
1172 resultjiffies = jiffies;
1176 if (status == (STATUS_DIR | STATUS_READY | STATUS_BUSY))
1177 reply_buffer[i] = fd_inb(FD_DATA);
1182 DPRINT("get result error. Fdc=%d Last status=%x Read bytes=%d\n",
1190 #define MORE_OUTPUT -2
1191 /* does the fdc need more output? */
1192 static int need_more_output(void)
1194 int status = wait_til_ready();
1199 if (is_ready_state(status))
1205 /* Set perpendicular mode as required, based on data rate, if supported.
1206 * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
1208 static void perpendicular_mode(void)
1210 unsigned char perp_mode;
1212 if (raw_cmd->rate & 0x40) {
1213 switch (raw_cmd->rate & 3) {
1221 DPRINT("Invalid data rate for perpendicular mode!\n");
1225 * convenient way to return to
1226 * redo without too much hassle
1227 * (deep stack et al.)
1234 if (FDCS->perp_mode == perp_mode)
1236 if (FDCS->version >= FDC_82077_ORIG) {
1237 output_byte(FD_PERPENDICULAR);
1238 output_byte(perp_mode);
1239 FDCS->perp_mode = perp_mode;
1240 } else if (perp_mode) {
1241 DPRINT("perpendicular mode not supported by this FDC.\n");
1243 } /* perpendicular_mode */
1245 static int fifo_depth = 0xa;
1248 static int fdc_configure(void)
1251 output_byte(FD_CONFIGURE);
1252 if (need_more_output() != MORE_OUTPUT)
1255 output_byte(0x10 | (no_fifo & 0x20) | (fifo_depth & 0xf));
1256 output_byte(0); /* pre-compensation from track
1261 #define NOMINAL_DTR 500
1263 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1264 * head load time, and DMA disable flag to values needed by floppy.
1266 * The value "dtr" is the data transfer rate in Kbps. It is needed
1267 * to account for the data rate-based scaling done by the 82072 and 82077
1268 * FDC types. This parameter is ignored for other types of FDCs (i.e.
1271 * Note that changing the data transfer rate has a (probably deleterious)
1272 * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1273 * fdc_specify is called again after each data transfer rate
1276 * srt: 1000 to 16000 in microseconds
1277 * hut: 16 to 240 milliseconds
1278 * hlt: 2 to 254 milliseconds
1280 * These values are rounded up to the next highest available delay time.
1282 static void fdc_specify(void)
1284 unsigned char spec1;
1285 unsigned char spec2;
1289 unsigned long dtr = NOMINAL_DTR;
1290 unsigned long scale_dtr = NOMINAL_DTR;
1291 int hlt_max_code = 0x7f;
1292 int hut_max_code = 0xf;
1294 if (FDCS->need_configure && FDCS->version >= FDC_82072A) {
1296 FDCS->need_configure = 0;
1299 switch (raw_cmd->rate & 0x03) {
1305 if (FDCS->version >= FDC_82078) {
1306 /* chose the default rate table, not the one
1307 * where 1 = 2 Mbps */
1308 output_byte(FD_DRIVESPEC);
1309 if (need_more_output() == MORE_OUTPUT) {
1310 output_byte(UNIT(current_drive));
1320 if (FDCS->version >= FDC_82072) {
1322 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1323 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1326 /* Convert step rate from microseconds to milliseconds and 4 bits */
1327 srt = 16 - DIV_ROUND_UP(DP->srt * scale_dtr / 1000, NOMINAL_DTR);
1334 hlt = DIV_ROUND_UP(DP->hlt * scale_dtr / 2, NOMINAL_DTR);
1337 else if (hlt > 0x7f)
1340 hut = DIV_ROUND_UP(DP->hut * scale_dtr / 16, NOMINAL_DTR);
1346 spec1 = (srt << 4) | hut;
1347 spec2 = (hlt << 1) | (use_virtual_dma & 1);
1349 /* If these parameters did not change, just return with success */
1350 if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1351 /* Go ahead and set spec1 and spec2 */
1352 output_byte(FD_SPECIFY);
1353 output_byte(FDCS->spec1 = spec1);
1354 output_byte(FDCS->spec2 = spec2);
1358 /* Set the FDC's data transfer rate on behalf of the specified drive.
1359 * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1360 * of the specify command (i.e. using the fdc_specify function).
1362 static int fdc_dtr(void)
1364 /* If data rate not already set to desired value, set it. */
1365 if ((raw_cmd->rate & 3) == FDCS->dtr)
1369 fd_outb(raw_cmd->rate & 3, FD_DCR);
1371 /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1372 * need a stabilization period of several milliseconds to be
1373 * enforced after data rate changes before R/W operations.
1374 * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1376 FDCS->dtr = raw_cmd->rate & 3;
1377 return fd_wait_for_completion(jiffies + 2UL * HZ / 100,
1378 (timeout_fn)floppy_ready);
1381 static void tell_sector(void)
1383 pr_cont(": track %d, head %d, sector %d, size %d",
1384 R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1387 static void print_errors(void)
1390 if (ST0 & ST0_ECE) {
1391 pr_cont("Recalibrate failed!");
1392 } else if (ST2 & ST2_CRC) {
1393 pr_cont("data CRC error");
1395 } else if (ST1 & ST1_CRC) {
1396 pr_cont("CRC error");
1398 } else if ((ST1 & (ST1_MAM | ST1_ND)) ||
1401 pr_cont("sector not found");
1404 pr_cont("probe failed...");
1405 } else if (ST2 & ST2_WC) { /* seek error */
1406 pr_cont("wrong cylinder");
1407 } else if (ST2 & ST2_BC) { /* cylinder marked as bad */
1408 pr_cont("bad cylinder");
1410 pr_cont("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x",
1418 * OK, this error interpreting routine is called after a
1419 * DMA read/write has succeeded
1420 * or failed, so we check the results, and copy any buffers.
1421 * hhb: Added better error reporting.
1422 * ak: Made this into a separate routine.
1424 static int interpret_errors(void)
1429 DPRINT("-- FDC reply error\n");
1434 /* check IC to find cause of interrupt */
1435 switch (ST0 & ST0_INTR) {
1436 case 0x40: /* error occurred during command execution */
1438 return 0; /* occurs with pseudo-DMA */
1441 DPRINT("Drive is write protected\n");
1442 clear_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1445 } else if (ST1 & ST1_ND) {
1446 set_bit(FD_NEED_TWADDLE_BIT, &DRS->flags);
1447 } else if (ST1 & ST1_OR) {
1448 if (DP->flags & FTD_MSG)
1449 DPRINT("Over/Underrun - retrying\n");
1451 } else if (*errors >= DP->max_errors.reporting) {
1454 if (ST2 & ST2_WC || ST2 & ST2_BC)
1455 /* wrong cylinder => recal */
1456 DRS->track = NEED_2_RECAL;
1458 case 0x80: /* invalid command given */
1459 DPRINT("Invalid FDC command given!\n");
1463 DPRINT("Abnormal termination caused by polling\n");
1466 default: /* (0) Normal command termination */
1472 * This routine is called when everything should be correctly set up
1473 * for the transfer (i.e. floppy motor is on, the correct floppy is
1474 * selected, and the head is sitting on the right track).
1476 static void setup_rw_floppy(void)
1482 unsigned long ready_date;
1483 timeout_fn function;
1485 flags = raw_cmd->flags;
1486 if (flags & (FD_RAW_READ | FD_RAW_WRITE))
1487 flags |= FD_RAW_INTR;
1489 if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)) {
1490 ready_date = DRS->spinup_date + DP->spinup;
1491 /* If spinup will take a long time, rerun scandrives
1492 * again just before spinup completion. Beware that
1493 * after scandrives, we must again wait for selection.
1495 if (time_after(ready_date, jiffies + DP->select_delay)) {
1496 ready_date -= DP->select_delay;
1497 function = (timeout_fn)floppy_start;
1499 function = (timeout_fn)setup_rw_floppy;
1501 /* wait until the floppy is spinning fast enough */
1502 if (fd_wait_for_completion(ready_date, function))
1505 dflags = DRS->flags;
1507 if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1510 if (flags & FD_RAW_INTR)
1511 do_floppy = main_command_interrupt;
1514 for (i = 0; i < raw_cmd->cmd_count; i++)
1515 r |= output_byte(raw_cmd->cmd[i]);
1517 debugt(__func__, "rw_command");
1525 if (!(flags & FD_RAW_INTR)) {
1528 } else if (flags & FD_RAW_NEED_DISK)
1532 static int blind_seek;
1535 * This is the routine called after every seek (or recalibrate) interrupt
1536 * from the floppy controller.
1538 static void seek_interrupt(void)
1540 debugt(__func__, "");
1541 if (inr != 2 || (ST0 & 0xF8) != 0x20) {
1542 DPRINT("seek failed\n");
1543 DRS->track = NEED_2_RECAL;
1548 if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek) {
1549 debug_dcl(DP->flags,
1550 "clearing NEWCHANGE flag because of effective seek\n");
1551 debug_dcl(DP->flags, "jiffies=%lu\n", jiffies);
1552 clear_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1553 /* effective seek */
1554 DRS->select_date = jiffies;
1560 static void check_wp(void)
1562 if (test_bit(FD_VERIFY_BIT, &DRS->flags)) {
1563 /* check write protection */
1564 output_byte(FD_GETSTATUS);
1565 output_byte(UNIT(current_drive));
1566 if (result() != 1) {
1570 clear_bit(FD_VERIFY_BIT, &DRS->flags);
1571 clear_bit(FD_NEED_TWADDLE_BIT, &DRS->flags);
1572 debug_dcl(DP->flags,
1573 "checking whether disk is write protected\n");
1574 debug_dcl(DP->flags, "wp=%x\n", ST3 & 0x40);
1576 set_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1578 clear_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1582 static void seek_floppy(void)
1588 debug_dcl(DP->flags, "calling disk change from %s\n", __func__);
1590 if (!test_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags) &&
1591 disk_change(current_drive) && (raw_cmd->flags & FD_RAW_NEED_DISK)) {
1592 /* the media changed flag should be cleared after the seek.
1593 * If it isn't, this means that there is really no disk in
1596 set_bit(FD_DISK_CHANGED_BIT, &DRS->flags);
1601 if (DRS->track <= NEED_1_RECAL) {
1602 recalibrate_floppy();
1604 } else if (test_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags) &&
1605 (raw_cmd->flags & FD_RAW_NEED_DISK) &&
1606 (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) {
1607 /* we seek to clear the media-changed condition. Does anybody
1608 * know a more elegant way, which works on all drives? */
1610 track = raw_cmd->track - 1;
1612 if (DP->flags & FD_SILENT_DCL_CLEAR) {
1613 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
1615 raw_cmd->flags |= FD_RAW_NEED_SEEK;
1621 if (raw_cmd->track != DRS->track &&
1622 (raw_cmd->flags & FD_RAW_NEED_SEEK))
1623 track = raw_cmd->track;
1630 do_floppy = seek_interrupt;
1631 output_byte(FD_SEEK);
1632 output_byte(UNIT(current_drive));
1633 if (output_byte(track) < 0) {
1637 debugt(__func__, "");
1640 static void recal_interrupt(void)
1642 debugt(__func__, "");
1645 else if (ST0 & ST0_ECE) {
1646 switch (DRS->track) {
1648 debugt(__func__, "need 1 recal");
1649 /* after a second recalibrate, we still haven't
1650 * reached track 0. Probably no drive. Raise an
1651 * error, as failing immediately might upset
1652 * computers possessed by the Devil :-) */
1657 debugt(__func__, "need 2 recal");
1658 /* If we already did a recalibrate,
1659 * and we are not at track 0, this
1660 * means we have moved. (The only way
1661 * not to move at recalibration is to
1662 * be already at track 0.) Clear the
1663 * new change flag */
1664 debug_dcl(DP->flags,
1665 "clearing NEWCHANGE flag because of second recalibrate\n");
1667 clear_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1668 DRS->select_date = jiffies;
1671 debugt(__func__, "default");
1672 /* Recalibrate moves the head by at
1673 * most 80 steps. If after one
1674 * recalibrate we don't have reached
1675 * track 0, this might mean that we
1676 * started beyond track 80. Try
1678 DRS->track = NEED_1_RECAL;
1686 static void print_result(char *message, int inr)
1690 DPRINT("%s ", message);
1692 for (i = 0; i < inr; i++)
1693 pr_cont("repl[%d]=%x ", i, reply_buffer[i]);
1697 /* interrupt handler. Note that this can be called externally on the Sparc */
1698 irqreturn_t floppy_interrupt(int irq, void *dev_id)
1702 void (*handler)(void) = do_floppy;
1704 lasthandler = handler;
1705 interruptjiffies = jiffies;
1707 f = claim_dma_lock();
1709 release_dma_lock(f);
1711 floppy_enable_hlt();
1713 if (fdc >= N_FDC || FDCS->address == -1) {
1714 /* we don't even know which FDC is the culprit */
1715 pr_info("DOR0=%x\n", fdc_state[0].dor);
1716 pr_info("floppy interrupt on bizarre fdc %d\n", fdc);
1717 pr_info("handler=%pf\n", handler);
1718 is_alive(__func__, "bizarre fdc");
1723 /* We have to clear the reset flag here, because apparently on boxes
1724 * with level triggered interrupts (PS/2, Sparc, ...), it is needed to
1725 * emit SENSEI's to clear the interrupt line. And FDCS->reset blocks the
1726 * emission of the SENSEI's.
1727 * It is OK to emit floppy commands because we are in an interrupt
1728 * handler here, and thus we have to fear no interference of other
1732 do_print = !handler && print_unex && initialized;
1736 print_result("unexpected interrupt", inr);
1740 output_byte(FD_SENSEI);
1743 print_result("sensei", inr);
1745 } while ((ST0 & 0x83) != UNIT(current_drive) &&
1746 inr == 2 && max_sensei);
1752 schedule_bh(handler);
1753 is_alive(__func__, "normal interrupt end");
1755 /* FIXME! Was it really for us? */
1759 static void recalibrate_floppy(void)
1761 debugt(__func__, "");
1762 do_floppy = recal_interrupt;
1763 output_byte(FD_RECALIBRATE);
1764 if (output_byte(UNIT(current_drive)) < 0)
1769 * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1771 static void reset_interrupt(void)
1773 debugt(__func__, "");
1774 result(); /* get the status ready for set_fdc */
1776 pr_info("reset set in interrupt, calling %pf\n", cont->error);
1777 cont->error(); /* a reset just after a reset. BAD! */
1783 * reset is done by pulling bit 2 of DOR low for a while (old FDCs),
1784 * or by setting the self clearing bit 7 of STATUS (newer FDCs)
1786 static void reset_fdc(void)
1788 unsigned long flags;
1790 do_floppy = reset_interrupt;
1794 /* Pseudo-DMA may intercept 'reset finished' interrupt. */
1795 /* Irrelevant for systems with true DMA (i386). */
1797 flags = claim_dma_lock();
1799 release_dma_lock(flags);
1801 if (FDCS->version >= FDC_82072A)
1802 fd_outb(0x80 | (FDCS->dtr & 3), FD_STATUS);
1804 fd_outb(FDCS->dor & ~0x04, FD_DOR);
1805 udelay(FD_RESET_DELAY);
1806 fd_outb(FDCS->dor, FD_DOR);
1810 static void show_floppy(void)
1815 pr_info("floppy driver state\n");
1816 pr_info("-------------------\n");
1817 pr_info("now=%lu last interrupt=%lu diff=%lu last called handler=%pf\n",
1818 jiffies, interruptjiffies, jiffies - interruptjiffies,
1821 pr_info("timeout_message=%s\n", timeout_message);
1822 pr_info("last output bytes:\n");
1823 for (i = 0; i < OLOGSIZE; i++)
1824 pr_info("%2x %2x %lu\n",
1825 output_log[(i + output_log_pos) % OLOGSIZE].data,
1826 output_log[(i + output_log_pos) % OLOGSIZE].status,
1827 output_log[(i + output_log_pos) % OLOGSIZE].jiffies);
1828 pr_info("last result at %lu\n", resultjiffies);
1829 pr_info("last redo_fd_request at %lu\n", lastredo);
1830 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1,
1831 reply_buffer, resultsize, true);
1833 pr_info("status=%x\n", fd_inb(FD_STATUS));
1834 pr_info("fdc_busy=%lu\n", fdc_busy);
1836 pr_info("do_floppy=%pf\n", do_floppy);
1837 if (work_pending(&floppy_work))
1838 pr_info("floppy_work.func=%pf\n", floppy_work.func);
1839 if (timer_pending(&fd_timer))
1840 pr_info("fd_timer.function=%pf\n", fd_timer.function);
1841 if (timer_pending(&fd_timeout)) {
1842 pr_info("timer_function=%pf\n", fd_timeout.function);
1843 pr_info("expires=%lu\n", fd_timeout.expires - jiffies);
1844 pr_info("now=%lu\n", jiffies);
1846 pr_info("cont=%p\n", cont);
1847 pr_info("current_req=%p\n", current_req);
1848 pr_info("command_status=%d\n", command_status);
1852 static void floppy_shutdown(unsigned long data)
1854 unsigned long flags;
1860 floppy_enable_hlt();
1862 flags = claim_dma_lock();
1864 release_dma_lock(flags);
1866 /* avoid dma going to a random drive after shutdown */
1869 DPRINT("floppy timeout called\n");
1873 cont->redo(); /* this will recall reset when needed */
1875 pr_info("no cont in shutdown!\n");
1876 process_fd_request();
1878 is_alive(__func__, "");
1881 /* start motor, check media-changed condition and write protection */
1882 static int start_motor(void (*function)(void))
1888 data = UNIT(current_drive);
1889 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)) {
1890 if (!(FDCS->dor & (0x10 << UNIT(current_drive)))) {
1892 /* no read since this drive is running */
1893 DRS->first_read_date = 0;
1894 /* note motor start time if motor is not yet running */
1895 DRS->spinup_date = jiffies;
1896 data |= (0x10 << UNIT(current_drive));
1898 } else if (FDCS->dor & (0x10 << UNIT(current_drive)))
1899 mask &= ~(0x10 << UNIT(current_drive));
1901 /* starts motor and selects floppy */
1902 del_timer(motor_off_timer + current_drive);
1903 set_dor(fdc, mask, data);
1905 /* wait_for_completion also schedules reset if needed. */
1906 return fd_wait_for_completion(DRS->select_date + DP->select_delay,
1907 (timeout_fn)function);
1910 static void floppy_ready(void)
1916 if (start_motor(floppy_ready))
1921 debug_dcl(DP->flags, "calling disk change from floppy_ready\n");
1922 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
1923 disk_change(current_drive) && !DP->select_delay)
1924 twaddle(); /* this clears the dcl on certain
1925 * drive/controller combinations */
1927 #ifdef fd_chose_dma_mode
1928 if ((raw_cmd->flags & FD_RAW_READ) || (raw_cmd->flags & FD_RAW_WRITE)) {
1929 unsigned long flags = claim_dma_lock();
1930 fd_chose_dma_mode(raw_cmd->kernel_data, raw_cmd->length);
1931 release_dma_lock(flags);
1935 if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)) {
1936 perpendicular_mode();
1937 fdc_specify(); /* must be done here because of hut, hlt ... */
1940 if ((raw_cmd->flags & FD_RAW_READ) ||
1941 (raw_cmd->flags & FD_RAW_WRITE))
1947 static void floppy_start(void)
1949 reschedule_timeout(current_reqD, "floppy start");
1952 debug_dcl(DP->flags, "setting NEWCHANGE in floppy_start\n");
1953 set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1958 * ========================================================================
1959 * here ends the bottom half. Exported routines are:
1960 * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1961 * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1962 * Initialization also uses output_byte, result, set_dor, floppy_interrupt
1964 * ========================================================================
1967 * General purpose continuations.
1968 * ==============================
1971 static void do_wakeup(void)
1973 reschedule_timeout(MAXTIMEOUT, "do wakeup");
1975 command_status += 2;
1976 wake_up(&command_done);
1979 static const struct cont_t wakeup_cont = {
1983 .done = (done_f)empty
1986 static const struct cont_t intr_cont = {
1988 .redo = process_fd_request,
1990 .done = (done_f)empty
1993 static int wait_til_done(void (*handler)(void), bool interruptible)
1997 schedule_bh(handler);
2000 wait_event_interruptible(command_done, command_status >= 2);
2002 wait_event(command_done, command_status >= 2);
2004 if (command_status < 2) {
2012 command_status = FD_COMMAND_ERROR;
2013 if (command_status == FD_COMMAND_OKAY)
2017 command_status = FD_COMMAND_NONE;
2021 static void generic_done(int result)
2023 command_status = result;
2024 cont = &wakeup_cont;
2027 static void generic_success(void)
2032 static void generic_failure(void)
2037 static void success_and_wakeup(void)
2044 * formatting and rw support.
2045 * ==========================
2048 static int next_valid_format(void)
2052 probed_format = DRS->probed_format;
2054 if (probed_format >= 8 || !DP->autodetect[probed_format]) {
2055 DRS->probed_format = 0;
2058 if (floppy_type[DP->autodetect[probed_format]].sect) {
2059 DRS->probed_format = probed_format;
2066 static void bad_flp_intr(void)
2071 DRS->probed_format++;
2072 if (!next_valid_format())
2075 err_count = ++(*errors);
2076 INFBOUND(DRWE->badness, err_count);
2077 if (err_count > DP->max_errors.abort)
2079 if (err_count > DP->max_errors.reset)
2081 else if (err_count > DP->max_errors.recal)
2082 DRS->track = NEED_2_RECAL;
2085 static void set_floppy(int drive)
2087 int type = ITYPE(UDRS->fd_device);
2090 _floppy = floppy_type + type;
2092 _floppy = current_type[drive];
2096 * formatting support.
2097 * ===================
2099 static void format_interrupt(void)
2101 switch (interpret_errors()) {
2112 #define FM_MODE(x, y) ((y) & ~(((x)->rate & 0x80) >> 1))
2113 #define CT(x) ((x) | 0xc0)
2115 static void setup_format_params(int track)
2123 unsigned char track, head, sect, size;
2124 } *here = (struct fparm *)floppy_track_buffer;
2126 raw_cmd = &default_raw_cmd;
2127 raw_cmd->track = track;
2129 raw_cmd->flags = (FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
2130 FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK);
2131 raw_cmd->rate = _floppy->rate & 0x43;
2132 raw_cmd->cmd_count = NR_F;
2133 COMMAND = FM_MODE(_floppy, FD_FORMAT);
2134 DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, format_req.head);
2135 F_SIZECODE = FD_SIZECODE(_floppy);
2136 F_SECT_PER_TRACK = _floppy->sect << 2 >> F_SIZECODE;
2137 F_GAP = _floppy->fmt_gap;
2138 F_FILL = FD_FILL_BYTE;
2140 raw_cmd->kernel_data = floppy_track_buffer;
2141 raw_cmd->length = 4 * F_SECT_PER_TRACK;
2143 /* allow for about 30ms for data transport per track */
2144 head_shift = (F_SECT_PER_TRACK + 5) / 6;
2146 /* a ``cylinder'' is two tracks plus a little stepping time */
2147 track_shift = 2 * head_shift + 3;
2149 /* position of logical sector 1 on this track */
2150 n = (track_shift * format_req.track + head_shift * format_req.head)
2153 /* determine interleave */
2155 if (_floppy->fmt_gap < 0x22)
2158 /* initialize field */
2159 for (count = 0; count < F_SECT_PER_TRACK; ++count) {
2160 here[count].track = format_req.track;
2161 here[count].head = format_req.head;
2162 here[count].sect = 0;
2163 here[count].size = F_SIZECODE;
2165 /* place logical sectors */
2166 for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
2167 here[n].sect = count;
2168 n = (n + il) % F_SECT_PER_TRACK;
2169 if (here[n].sect) { /* sector busy, find next free sector */
2171 if (n >= F_SECT_PER_TRACK) {
2172 n -= F_SECT_PER_TRACK;
2173 while (here[n].sect)
2178 if (_floppy->stretch & FD_SECTBASEMASK) {
2179 for (count = 0; count < F_SECT_PER_TRACK; count++)
2180 here[count].sect += FD_SECTBASE(_floppy) - 1;
2184 static void redo_format(void)
2187 setup_format_params(format_req.track << STRETCH(_floppy));
2189 debugt(__func__, "queue format request");
2192 static const struct cont_t format_cont = {
2193 .interrupt = format_interrupt,
2194 .redo = redo_format,
2195 .error = bad_flp_intr,
2196 .done = generic_done
2199 static int do_format(int drive, struct format_descr *tmp_format_req)
2203 if (lock_fdc(drive, true))
2208 _floppy->track > DP->tracks ||
2209 tmp_format_req->track >= _floppy->track ||
2210 tmp_format_req->head >= _floppy->head ||
2211 (_floppy->sect << 2) % (1 << FD_SIZECODE(_floppy)) ||
2212 !_floppy->fmt_gap) {
2213 process_fd_request();
2216 format_req = *tmp_format_req;
2218 cont = &format_cont;
2219 errors = &format_errors;
2220 ret = wait_til_done(redo_format, true);
2223 process_fd_request();
2228 * Buffer read/write and support
2229 * =============================
2232 static void floppy_end_request(struct request *req, int error)
2234 unsigned int nr_sectors = current_count_sectors;
2235 unsigned int drive = (unsigned long)req->rq_disk->private_data;
2237 /* current_count_sectors can be zero if transfer failed */
2239 nr_sectors = blk_rq_cur_sectors(req);
2240 if (__blk_end_request(req, error, nr_sectors << 9))
2243 /* We're done with the request */
2248 /* new request_done. Can handle physical sectors which are smaller than a
2250 static void request_done(int uptodate)
2252 struct request *req = current_req;
2253 struct request_queue *q;
2254 unsigned long flags;
2256 char msg[sizeof("request done ") + sizeof(int) * 3];
2259 snprintf(msg, sizeof(msg), "request done %d", uptodate);
2260 reschedule_timeout(MAXTIMEOUT, msg);
2263 pr_info("floppy.c: no request in request_done\n");
2270 /* maintain values for invalidation on geometry
2272 block = current_count_sectors + blk_rq_pos(req);
2273 INFBOUND(DRS->maxblock, block);
2274 if (block > _floppy->sect)
2277 /* unlock chained buffers */
2278 spin_lock_irqsave(q->queue_lock, flags);
2279 floppy_end_request(req, 0);
2280 spin_unlock_irqrestore(q->queue_lock, flags);
2282 if (rq_data_dir(req) == WRITE) {
2283 /* record write error information */
2284 DRWE->write_errors++;
2285 if (DRWE->write_errors == 1) {
2286 DRWE->first_error_sector = blk_rq_pos(req);
2287 DRWE->first_error_generation = DRS->generation;
2289 DRWE->last_error_sector = blk_rq_pos(req);
2290 DRWE->last_error_generation = DRS->generation;
2292 spin_lock_irqsave(q->queue_lock, flags);
2293 floppy_end_request(req, -EIO);
2294 spin_unlock_irqrestore(q->queue_lock, flags);
2298 /* Interrupt handler evaluating the result of the r/w operation */
2299 static void rw_interrupt(void)
2307 /* some Toshiba floppy controllers occasionnally seem to
2308 * return bogus interrupts after read/write operations, which
2309 * can be recognized by a bad head number (>= 2) */
2313 if (!DRS->first_read_date)
2314 DRS->first_read_date = jiffies;
2317 ssize = DIV_ROUND_UP(1 << SIZECODE, 4);
2329 nr_sectors = (((R_TRACK - TRACK) * heads +
2330 R_HEAD - HEAD) * SECT_PER_TRACK +
2331 R_SECTOR - SECTOR + eoc) << SIZECODE >> 2;
2333 if (nr_sectors / ssize >
2334 DIV_ROUND_UP(in_sector_offset + current_count_sectors, ssize)) {
2335 DPRINT("long rw: %x instead of %lx\n",
2336 nr_sectors, current_count_sectors);
2337 pr_info("rs=%d s=%d\n", R_SECTOR, SECTOR);
2338 pr_info("rh=%d h=%d\n", R_HEAD, HEAD);
2339 pr_info("rt=%d t=%d\n", R_TRACK, TRACK);
2340 pr_info("heads=%d eoc=%d\n", heads, eoc);
2341 pr_info("spt=%d st=%d ss=%d\n",
2342 SECT_PER_TRACK, fsector_t, ssize);
2343 pr_info("in_sector_offset=%d\n", in_sector_offset);
2346 nr_sectors -= in_sector_offset;
2347 INFBOUND(nr_sectors, 0);
2348 SUPBOUND(current_count_sectors, nr_sectors);
2350 switch (interpret_errors()) {
2355 if (!current_count_sectors) {
2362 if (!current_count_sectors) {
2366 current_type[current_drive] = _floppy;
2367 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2372 if (DP->flags & FTD_MSG)
2373 DPRINT("Auto-detected floppy type %s in fd%d\n",
2374 _floppy->name, current_drive);
2375 current_type[current_drive] = _floppy;
2376 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2380 if (CT(COMMAND) != FD_READ ||
2381 raw_cmd->kernel_data == current_req->buffer) {
2382 /* transfer directly from buffer */
2384 } else if (CT(COMMAND) == FD_READ) {
2385 buffer_track = raw_cmd->track;
2386 buffer_drive = current_drive;
2387 INFBOUND(buffer_max, nr_sectors + fsector_t);
2392 /* Compute maximal contiguous buffer size. */
2393 static int buffer_chain_size(void)
2397 struct req_iterator iter;
2400 base = bio_data(current_req->bio);
2403 rq_for_each_segment(bv, current_req, iter) {
2404 if (page_address(bv->bv_page) + bv->bv_offset != base + size)
2413 /* Compute the maximal transfer size */
2414 static int transfer_size(int ssize, int max_sector, int max_size)
2416 SUPBOUND(max_sector, fsector_t + max_size);
2419 max_sector -= (max_sector % _floppy->sect) % ssize;
2421 /* transfer size, beginning not aligned */
2422 current_count_sectors = max_sector - fsector_t;
2428 * Move data from/to the track buffer to/from the buffer cache.
2430 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
2432 int remaining; /* number of transferred 512-byte sectors */
2437 struct req_iterator iter;
2439 max_sector = transfer_size(ssize,
2440 min(max_sector, max_sector_2),
2441 blk_rq_sectors(current_req));
2443 if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2444 buffer_max > fsector_t + blk_rq_sectors(current_req))
2445 current_count_sectors = min_t(int, buffer_max - fsector_t,
2446 blk_rq_sectors(current_req));
2448 remaining = current_count_sectors << 9;
2449 if (remaining > blk_rq_bytes(current_req) && CT(COMMAND) == FD_WRITE) {
2450 DPRINT("in copy buffer\n");
2451 pr_info("current_count_sectors=%ld\n", current_count_sectors);
2452 pr_info("remaining=%d\n", remaining >> 9);
2453 pr_info("current_req->nr_sectors=%u\n",
2454 blk_rq_sectors(current_req));
2455 pr_info("current_req->current_nr_sectors=%u\n",
2456 blk_rq_cur_sectors(current_req));
2457 pr_info("max_sector=%d\n", max_sector);
2458 pr_info("ssize=%d\n", ssize);
2461 buffer_max = max(max_sector, buffer_max);
2463 dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9);
2465 size = blk_rq_cur_bytes(current_req);
2467 rq_for_each_segment(bv, current_req, iter) {
2472 SUPBOUND(size, remaining);
2474 buffer = page_address(bv->bv_page) + bv->bv_offset;
2475 if (dma_buffer + size >
2476 floppy_track_buffer + (max_buffer_sectors << 10) ||
2477 dma_buffer < floppy_track_buffer) {
2478 DPRINT("buffer overrun in copy buffer %d\n",
2479 (int)((floppy_track_buffer - dma_buffer) >> 9));
2480 pr_info("fsector_t=%d buffer_min=%d\n",
2481 fsector_t, buffer_min);
2482 pr_info("current_count_sectors=%ld\n",
2483 current_count_sectors);
2484 if (CT(COMMAND) == FD_READ)
2486 if (CT(COMMAND) == FD_WRITE)
2490 if (((unsigned long)buffer) % 512)
2491 DPRINT("%p buffer not aligned\n", buffer);
2493 if (CT(COMMAND) == FD_READ)
2494 memcpy(buffer, dma_buffer, size);
2496 memcpy(dma_buffer, buffer, size);
2503 max_sector -= remaining >> 9;
2504 DPRINT("weirdness: remaining %d\n", remaining >> 9);
2508 /* work around a bug in pseudo DMA
2509 * (on some FDCs) pseudo DMA does not stop when the CPU stops
2510 * sending data. Hence we need a different way to signal the
2511 * transfer length: We use SECT_PER_TRACK. Unfortunately, this
2512 * does not work with MT, hence we can only transfer one head at
2515 static void virtualdmabug_workaround(void)
2520 if (CT(COMMAND) == FD_WRITE) {
2521 COMMAND &= ~0x80; /* switch off multiple track mode */
2523 hard_sectors = raw_cmd->length >> (7 + SIZECODE);
2524 end_sector = SECTOR + hard_sectors - 1;
2525 if (end_sector > SECT_PER_TRACK) {
2526 pr_info("too many sectors %d > %d\n",
2527 end_sector, SECT_PER_TRACK);
2530 SECT_PER_TRACK = end_sector;
2531 /* make sure SECT_PER_TRACK
2532 * points to end of transfer */
2537 * Formulate a read/write request.
2538 * this routine decides where to load the data (directly to buffer, or to
2539 * tmp floppy area), how much data to load (the size of the buffer, the whole
2540 * track, or a single sector)
2541 * All floppy_track_buffer handling goes in here. If we ever add track buffer
2542 * allocation on the fly, it should be done here. No other part should need
2546 static int make_raw_rw_request(void)
2548 int aligned_sector_t;
2554 if (WARN(max_buffer_sectors == 0, "VFS: Block I/O scheduled on unopened device\n"))
2557 set_fdc((long)current_req->rq_disk->private_data);
2559 raw_cmd = &default_raw_cmd;
2560 raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
2562 raw_cmd->cmd_count = NR_RW;
2563 if (rq_data_dir(current_req) == READ) {
2564 raw_cmd->flags |= FD_RAW_READ;
2565 COMMAND = FM_MODE(_floppy, FD_READ);
2566 } else if (rq_data_dir(current_req) == WRITE) {
2567 raw_cmd->flags |= FD_RAW_WRITE;
2568 COMMAND = FM_MODE(_floppy, FD_WRITE);
2570 DPRINT("%s: unknown command\n", __func__);
2574 max_sector = _floppy->sect * _floppy->head;
2576 TRACK = (int)blk_rq_pos(current_req) / max_sector;
2577 fsector_t = (int)blk_rq_pos(current_req) % max_sector;
2578 if (_floppy->track && TRACK >= _floppy->track) {
2579 if (blk_rq_cur_sectors(current_req) & 1) {
2580 current_count_sectors = 1;
2585 HEAD = fsector_t / _floppy->sect;
2587 if (((_floppy->stretch & (FD_SWAPSIDES | FD_SECTBASEMASK)) ||
2588 test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags)) &&
2589 fsector_t < _floppy->sect)
2590 max_sector = _floppy->sect;
2592 /* 2M disks have phantom sectors on the first track */
2593 if ((_floppy->rate & FD_2M) && (!TRACK) && (!HEAD)) {
2594 max_sector = 2 * _floppy->sect / 3;
2595 if (fsector_t >= max_sector) {
2596 current_count_sectors =
2597 min_t(int, _floppy->sect - fsector_t,
2598 blk_rq_sectors(current_req));
2603 SIZECODE = FD_SIZECODE(_floppy);
2604 raw_cmd->rate = _floppy->rate & 0x43;
2605 if ((_floppy->rate & FD_2M) && (TRACK || HEAD) && raw_cmd->rate == 2)
2612 raw_cmd->track = TRACK << STRETCH(_floppy);
2613 DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, HEAD);
2615 ssize = DIV_ROUND_UP(1 << SIZECODE, 4);
2616 SECT_PER_TRACK = _floppy->sect << 2 >> SIZECODE;
2617 SECTOR = ((fsector_t % _floppy->sect) << 2 >> SIZECODE) +
2618 FD_SECTBASE(_floppy);
2620 /* tracksize describes the size which can be filled up with sectors
2623 tracksize = _floppy->sect - _floppy->sect % ssize;
2624 if (tracksize < _floppy->sect) {
2626 if (tracksize <= fsector_t % _floppy->sect)
2629 /* if we are beyond tracksize, fill up using smaller sectors */
2630 while (tracksize <= fsector_t % _floppy->sect) {
2631 while (tracksize + ssize > _floppy->sect) {
2639 max_sector = HEAD * _floppy->sect + tracksize;
2640 } else if (!TRACK && !HEAD && !(_floppy->rate & FD_2M) && probing) {
2641 max_sector = _floppy->sect;
2642 } else if (!HEAD && CT(COMMAND) == FD_WRITE) {
2643 /* for virtual DMA bug workaround */
2644 max_sector = _floppy->sect;
2647 in_sector_offset = (fsector_t % _floppy->sect) % ssize;
2648 aligned_sector_t = fsector_t - in_sector_offset;
2649 max_size = blk_rq_sectors(current_req);
2650 if ((raw_cmd->track == buffer_track) &&
2651 (current_drive == buffer_drive) &&
2652 (fsector_t >= buffer_min) && (fsector_t < buffer_max)) {
2653 /* data already in track buffer */
2654 if (CT(COMMAND) == FD_READ) {
2655 copy_buffer(1, max_sector, buffer_max);
2658 } else if (in_sector_offset || blk_rq_sectors(current_req) < ssize) {
2659 if (CT(COMMAND) == FD_WRITE) {
2660 unsigned int sectors;
2662 sectors = fsector_t + blk_rq_sectors(current_req);
2663 if (sectors > ssize && sectors < ssize + ssize)
2664 max_size = ssize + ssize;
2668 raw_cmd->flags &= ~FD_RAW_WRITE;
2669 raw_cmd->flags |= FD_RAW_READ;
2670 COMMAND = FM_MODE(_floppy, FD_READ);
2671 } else if ((unsigned long)current_req->buffer < MAX_DMA_ADDRESS) {
2672 unsigned long dma_limit;
2673 int direct, indirect;
2676 transfer_size(ssize, max_sector,
2677 max_buffer_sectors * 2) - fsector_t;
2680 * Do NOT use minimum() here---MAX_DMA_ADDRESS is 64 bits wide
2681 * on a 64 bit machine!
2683 max_size = buffer_chain_size();
2684 dma_limit = (MAX_DMA_ADDRESS -
2685 ((unsigned long)current_req->buffer)) >> 9;
2686 if ((unsigned long)max_size > dma_limit)
2687 max_size = dma_limit;
2688 /* 64 kb boundaries */
2689 if (CROSS_64KB(current_req->buffer, max_size << 9))
2691 ((unsigned long)current_req->buffer) %
2693 direct = transfer_size(ssize, max_sector, max_size) - fsector_t;
2695 * We try to read tracks, but if we get too many errors, we
2696 * go back to reading just one sector at a time.
2698 * This means we should be able to read a sector even if there
2699 * are other bad sectors on this track.
2702 (indirect * 2 > direct * 3 &&
2703 *errors < DP->max_errors.read_track &&
2705 (DP->read_track & (1 << DRS->probed_format)))))) {
2706 max_size = blk_rq_sectors(current_req);
2708 raw_cmd->kernel_data = current_req->buffer;
2709 raw_cmd->length = current_count_sectors << 9;
2710 if (raw_cmd->length == 0) {
2711 DPRINT("%s: zero dma transfer attempted\n", __func__);
2712 DPRINT("indirect=%d direct=%d fsector_t=%d\n",
2713 indirect, direct, fsector_t);
2716 virtualdmabug_workaround();
2721 if (CT(COMMAND) == FD_READ)
2722 max_size = max_sector; /* unbounded */
2724 /* claim buffer track if needed */
2725 if (buffer_track != raw_cmd->track || /* bad track */
2726 buffer_drive != current_drive || /* bad drive */
2727 fsector_t > buffer_max ||
2728 fsector_t < buffer_min ||
2729 ((CT(COMMAND) == FD_READ ||
2730 (!in_sector_offset && blk_rq_sectors(current_req) >= ssize)) &&
2731 max_sector > 2 * max_buffer_sectors + buffer_min &&
2732 max_size + fsector_t > 2 * max_buffer_sectors + buffer_min)) {
2733 /* not enough space */
2735 buffer_drive = current_drive;
2736 buffer_max = buffer_min = aligned_sector_t;
2738 raw_cmd->kernel_data = floppy_track_buffer +
2739 ((aligned_sector_t - buffer_min) << 9);
2741 if (CT(COMMAND) == FD_WRITE) {
2742 /* copy write buffer to track buffer.
2743 * if we get here, we know that the write
2744 * is either aligned or the data already in the buffer
2745 * (buffer will be overwritten) */
2746 if (in_sector_offset && buffer_track == -1)
2747 DPRINT("internal error offset !=0 on write\n");
2748 buffer_track = raw_cmd->track;
2749 buffer_drive = current_drive;
2750 copy_buffer(ssize, max_sector,
2751 2 * max_buffer_sectors + buffer_min);
2753 transfer_size(ssize, max_sector,
2754 2 * max_buffer_sectors + buffer_min -
2757 /* round up current_count_sectors to get dma xfer size */
2758 raw_cmd->length = in_sector_offset + current_count_sectors;
2759 raw_cmd->length = ((raw_cmd->length - 1) | (ssize - 1)) + 1;
2760 raw_cmd->length <<= 9;
2761 if ((raw_cmd->length < current_count_sectors << 9) ||
2762 (raw_cmd->kernel_data != current_req->buffer &&
2763 CT(COMMAND) == FD_WRITE &&
2764 (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
2765 aligned_sector_t < buffer_min)) ||
2766 raw_cmd->length % (128 << SIZECODE) ||
2767 raw_cmd->length <= 0 || current_count_sectors <= 0) {
2768 DPRINT("fractionary current count b=%lx s=%lx\n",
2769 raw_cmd->length, current_count_sectors);
2770 if (raw_cmd->kernel_data != current_req->buffer)
2771 pr_info("addr=%d, length=%ld\n",
2772 (int)((raw_cmd->kernel_data -
2773 floppy_track_buffer) >> 9),
2774 current_count_sectors);
2775 pr_info("st=%d ast=%d mse=%d msi=%d\n",
2776 fsector_t, aligned_sector_t, max_sector, max_size);
2777 pr_info("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2778 pr_info("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2779 COMMAND, SECTOR, HEAD, TRACK);
2780 pr_info("buffer drive=%d\n", buffer_drive);
2781 pr_info("buffer track=%d\n", buffer_track);
2782 pr_info("buffer_min=%d\n", buffer_min);
2783 pr_info("buffer_max=%d\n", buffer_max);
2787 if (raw_cmd->kernel_data != current_req->buffer) {
2788 if (raw_cmd->kernel_data < floppy_track_buffer ||
2789 current_count_sectors < 0 ||
2790 raw_cmd->length < 0 ||
2791 raw_cmd->kernel_data + raw_cmd->length >
2792 floppy_track_buffer + (max_buffer_sectors << 10)) {
2793 DPRINT("buffer overrun in schedule dma\n");
2794 pr_info("fsector_t=%d buffer_min=%d current_count=%ld\n",
2795 fsector_t, buffer_min, raw_cmd->length >> 9);
2796 pr_info("current_count_sectors=%ld\n",
2797 current_count_sectors);
2798 if (CT(COMMAND) == FD_READ)
2800 if (CT(COMMAND) == FD_WRITE)
2804 } else if (raw_cmd->length > blk_rq_bytes(current_req) ||
2805 current_count_sectors > blk_rq_sectors(current_req)) {
2806 DPRINT("buffer overrun in direct transfer\n");
2808 } else if (raw_cmd->length < current_count_sectors << 9) {
2809 DPRINT("more sectors than bytes\n");
2810 pr_info("bytes=%ld\n", raw_cmd->length >> 9);
2811 pr_info("sectors=%ld\n", current_count_sectors);
2813 if (raw_cmd->length == 0) {
2814 DPRINT("zero dma transfer attempted from make_raw_request\n");
2818 virtualdmabug_workaround();
2823 * Round-robin between our available drives, doing one request from each
2825 static int set_next_request(void)
2827 struct request_queue *q;
2828 int old_pos = fdc_queue;
2831 q = disks[fdc_queue]->queue;
2832 if (++fdc_queue == N_DRIVE)
2835 current_req = blk_fetch_request(q);
2839 } while (fdc_queue != old_pos);
2841 return current_req != NULL;
2844 static void redo_fd_request(void)
2850 if (current_drive < N_DRIVE)
2851 floppy_off(current_drive);
2857 spin_lock_irq(&floppy_lock);
2858 pending = set_next_request();
2859 spin_unlock_irq(&floppy_lock);
2867 drive = (long)current_req->rq_disk->private_data;
2869 reschedule_timeout(current_reqD, "redo fd request");
2872 raw_cmd = &default_raw_cmd;
2874 if (start_motor(redo_fd_request))
2877 disk_change(current_drive);
2878 if (test_bit(current_drive, &fake_change) ||
2879 test_bit(FD_DISK_CHANGED_BIT, &DRS->flags)) {
2880 DPRINT("disk absent or changed during operation\n");
2884 if (!_floppy) { /* Autodetection */
2886 DRS->probed_format = 0;
2887 if (next_valid_format()) {
2888 DPRINT("no autodetectable formats\n");
2895 _floppy = floppy_type + DP->autodetect[DRS->probed_format];
2898 errors = &(current_req->errors);
2899 tmp = make_raw_rw_request();
2905 if (test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags))
2907 schedule_bh(floppy_start);
2908 debugt(__func__, "queue fd request");
2912 static const struct cont_t rw_cont = {
2913 .interrupt = rw_interrupt,
2914 .redo = redo_fd_request,
2915 .error = bad_flp_intr,
2916 .done = request_done
2919 static void process_fd_request(void)
2922 schedule_bh(redo_fd_request);
2925 static void do_fd_request(struct request_queue *q)
2927 if (WARN(max_buffer_sectors == 0,
2928 "VFS: %s called on non-open device\n", __func__))
2931 if (WARN(atomic_read(&usage_count) == 0,
2932 "warning: usage count=0, current_req=%p sect=%ld type=%x flags=%x\n",
2933 current_req, (long)blk_rq_pos(current_req), current_req->cmd_type,
2934 current_req->cmd_flags))
2937 if (test_bit(0, &fdc_busy)) {
2938 /* fdc busy, this new request will be treated when the
2939 current one is done */
2940 is_alive(__func__, "old request running");
2943 lock_fdc(MAXTIMEOUT, false);
2944 process_fd_request();
2945 is_alive(__func__, "");
2948 static const struct cont_t poll_cont = {
2949 .interrupt = success_and_wakeup,
2950 .redo = floppy_ready,
2951 .error = generic_failure,
2952 .done = generic_done
2955 static int poll_drive(bool interruptible, int flag)
2957 /* no auto-sense, just clear dcl */
2958 raw_cmd = &default_raw_cmd;
2959 raw_cmd->flags = flag;
2961 raw_cmd->cmd_count = 0;
2963 debug_dcl(DP->flags, "setting NEWCHANGE in poll_drive\n");
2964 set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
2966 return wait_til_done(floppy_ready, interruptible);
2970 * User triggered reset
2971 * ====================
2974 static void reset_intr(void)
2976 pr_info("weird, reset interrupt called\n");
2979 static const struct cont_t reset_cont = {
2980 .interrupt = reset_intr,
2981 .redo = success_and_wakeup,
2982 .error = generic_failure,
2983 .done = generic_done
2986 static int user_reset_fdc(int drive, int arg, bool interruptible)
2990 if (lock_fdc(drive, interruptible))
2993 if (arg == FD_RESET_ALWAYS)
2997 ret = wait_til_done(reset_fdc, interruptible);
3001 process_fd_request();
3006 * Misc Ioctl's and support
3007 * ========================
3009 static inline int fd_copyout(void __user *param, const void *address,
3012 return copy_to_user(param, address, size) ? -EFAULT : 0;
3015 static inline int fd_copyin(void __user *param, void *address,
3018 return copy_from_user(address, param, size) ? -EFAULT : 0;
3021 static const char *drive_name(int type, int drive)
3023 struct floppy_struct *floppy;
3026 floppy = floppy_type + type;
3028 if (UDP->native_format)
3029 floppy = floppy_type + UDP->native_format;
3034 return floppy->name;
3040 static void raw_cmd_done(int flag)
3045 raw_cmd->flags |= FD_RAW_FAILURE;
3046 raw_cmd->flags |= FD_RAW_HARDFAILURE;
3048 raw_cmd->reply_count = inr;
3049 if (raw_cmd->reply_count > MAX_REPLIES)
3050 raw_cmd->reply_count = 0;
3051 for (i = 0; i < raw_cmd->reply_count; i++)
3052 raw_cmd->reply[i] = reply_buffer[i];
3054 if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3055 unsigned long flags;
3056 flags = claim_dma_lock();
3057 raw_cmd->length = fd_get_dma_residue();
3058 release_dma_lock(flags);
3061 if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
3062 (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
3063 raw_cmd->flags |= FD_RAW_FAILURE;
3065 if (disk_change(current_drive))
3066 raw_cmd->flags |= FD_RAW_DISK_CHANGE;
3068 raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
3069 if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
3070 motor_off_callback(current_drive);
3072 if (raw_cmd->next &&
3073 (!(raw_cmd->flags & FD_RAW_FAILURE) ||
3074 !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
3075 ((raw_cmd->flags & FD_RAW_FAILURE) ||
3076 !(raw_cmd->flags & FD_RAW_STOP_IF_SUCCESS))) {
3077 raw_cmd = raw_cmd->next;
3084 static const struct cont_t raw_cmd_cont = {
3085 .interrupt = success_and_wakeup,
3086 .redo = floppy_start,
3087 .error = generic_failure,
3088 .done = raw_cmd_done
3091 static int raw_cmd_copyout(int cmd, void __user *param,
3092 struct floppy_raw_cmd *ptr)
3097 ret = copy_to_user(param, ptr, sizeof(*ptr));
3100 param += sizeof(struct floppy_raw_cmd);
3101 if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) {
3102 if (ptr->length >= 0 &&
3103 ptr->length <= ptr->buffer_length) {
3104 long length = ptr->buffer_length - ptr->length;
3105 ret = fd_copyout(ptr->data, ptr->kernel_data,
3117 static void raw_cmd_free(struct floppy_raw_cmd **ptr)
3119 struct floppy_raw_cmd *next;
3120 struct floppy_raw_cmd *this;
3125 if (this->buffer_length) {
3126 fd_dma_mem_free((unsigned long)this->kernel_data,
3127 this->buffer_length);
3128 this->buffer_length = 0;
3136 static int raw_cmd_copyin(int cmd, void __user *param,
3137 struct floppy_raw_cmd **rcmd)
3139 struct floppy_raw_cmd *ptr;
3146 ptr = kmalloc(sizeof(struct floppy_raw_cmd), GFP_USER);
3150 ret = copy_from_user(ptr, param, sizeof(*ptr));
3154 ptr->buffer_length = 0;
3155 param += sizeof(struct floppy_raw_cmd);
3156 if (ptr->cmd_count > 33)
3157 /* the command may now also take up the space
3158 * initially intended for the reply & the
3159 * reply count. Needed for long 82078 commands
3160 * such as RESTORE, which takes ... 17 command
3161 * bytes. Murphy's law #137: When you reserve
3162 * 16 bytes for a structure, you'll one day
3163 * discover that you really need 17...
3167 for (i = 0; i < 16; i++)
3169 ptr->resultcode = 0;
3170 ptr->kernel_data = NULL;
3172 if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3173 if (ptr->length <= 0)
3175 ptr->kernel_data = (char *)fd_dma_mem_alloc(ptr->length);
3176 fallback_on_nodma_alloc(&ptr->kernel_data, ptr->length);
3177 if (!ptr->kernel_data)
3179 ptr->buffer_length = ptr->length;
3181 if (ptr->flags & FD_RAW_WRITE) {
3182 ret = fd_copyin(ptr->data, ptr->kernel_data, ptr->length);
3187 if (ptr->flags & FD_RAW_MORE) {
3188 rcmd = &(ptr->next);
3196 static int raw_cmd_ioctl(int cmd, void __user *param)
3198 struct floppy_raw_cmd *my_raw_cmd;
3203 if (FDCS->rawcmd <= 1)
3205 for (drive = 0; drive < N_DRIVE; drive++) {
3206 if (FDC(drive) != fdc)
3208 if (drive == current_drive) {
3209 if (UDRS->fd_ref > 1) {
3213 } else if (UDRS->fd_ref) {
3222 ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
3224 raw_cmd_free(&my_raw_cmd);
3228 raw_cmd = my_raw_cmd;
3229 cont = &raw_cmd_cont;
3230 ret = wait_til_done(floppy_start, true);
3231 debug_dcl(DP->flags, "calling disk change from raw_cmd ioctl\n");
3233 if (ret != -EINTR && FDCS->reset)
3236 DRS->track = NO_TRACK;
3238 ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
3241 raw_cmd_free(&my_raw_cmd);
3245 static int invalidate_drive(struct block_device *bdev)
3247 /* invalidate the buffer track to force a reread */
3248 set_bit((long)bdev->bd_disk->private_data, &fake_change);
3249 process_fd_request();
3250 check_disk_change(bdev);
3254 static int set_geometry(unsigned int cmd, struct floppy_struct *g,
3255 int drive, int type, struct block_device *bdev)
3259 /* sanity checking for parameters. */
3262 g->track <= 0 || g->track > UDP->tracks >> STRETCH(g) ||
3263 /* check if reserved bits are set */
3264 (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_SECTBASEMASK)) != 0)
3267 if (!capable(CAP_SYS_ADMIN))
3269 mutex_lock(&open_lock);
3270 if (lock_fdc(drive, true)) {
3271 mutex_unlock(&open_lock);
3274 floppy_type[type] = *g;
3275 floppy_type[type].name = "user format";
3276 for (cnt = type << 2; cnt < (type << 2) + 4; cnt++)
3277 floppy_sizes[cnt] = floppy_sizes[cnt + 0x80] =
3278 floppy_type[type].size + 1;
3279 process_fd_request();
3280 for (cnt = 0; cnt < N_DRIVE; cnt++) {
3281 struct block_device *bdev = opened_bdev[cnt];
3282 if (!bdev || ITYPE(drive_state[cnt].fd_device) != type)
3284 __invalidate_device(bdev, true);
3286 mutex_unlock(&open_lock);
3290 if (lock_fdc(drive, true))
3292 if (cmd != FDDEFPRM) {
3293 /* notice a disk change immediately, else
3294 * we lose our settings immediately*/
3295 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3298 oldStretch = g->stretch;
3299 user_params[drive] = *g;
3300 if (buffer_drive == drive)
3301 SUPBOUND(buffer_max, user_params[drive].sect);
3302 current_type[drive] = &user_params[drive];
3303 floppy_sizes[drive] = user_params[drive].size;
3304 if (cmd == FDDEFPRM)
3305 DRS->keep_data = -1;
3308 /* invalidation. Invalidate only when needed, i.e.
3309 * when there are already sectors in the buffer cache
3310 * whose number will change. This is useful, because
3311 * mtools often changes the geometry of the disk after
3312 * looking at the boot block */
3313 if (DRS->maxblock > user_params[drive].sect ||
3315 ((user_params[drive].sect ^ oldStretch) &
3316 (FD_SWAPSIDES | FD_SECTBASEMASK)))
3317 invalidate_drive(bdev);
3319 process_fd_request();
3324 /* handle obsolete ioctl's */
3325 static unsigned int ioctl_table[] = {
3353 static int normalize_ioctl(unsigned int *cmd, int *size)
3357 for (i = 0; i < ARRAY_SIZE(ioctl_table); i++) {
3358 if ((*cmd & 0xffff) == (ioctl_table[i] & 0xffff)) {
3359 *size = _IOC_SIZE(*cmd);
3360 *cmd = ioctl_table[i];
3361 if (*size > _IOC_SIZE(*cmd)) {
3362 pr_info("ioctl not yet supported\n");
3371 static int get_floppy_geometry(int drive, int type, struct floppy_struct **g)
3374 *g = &floppy_type[type];
3376 if (lock_fdc(drive, false))
3378 if (poll_drive(false, 0) == -EINTR)
3380 process_fd_request();
3381 *g = current_type[drive];
3388 static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3390 int drive = (long)bdev->bd_disk->private_data;
3391 int type = ITYPE(drive_state[drive].fd_device);
3392 struct floppy_struct *g;
3395 ret = get_floppy_geometry(drive, type, &g);
3399 geo->heads = g->head;
3400 geo->sectors = g->sect;
3401 geo->cylinders = g->track;
3405 static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
3406 unsigned long param)
3408 int drive = (long)bdev->bd_disk->private_data;
3409 int type = ITYPE(UDRS->fd_device);
3414 struct floppy_struct g; /* geometry */
3415 struct format_descr f;
3416 struct floppy_max_errors max_errors;
3417 struct floppy_drive_params dp;
3418 } inparam; /* parameters coming from user space */
3419 const void *outparam; /* parameters passed back to user space */
3421 /* convert compatibility eject ioctls into floppy eject ioctl.
3422 * We do this in order to provide a means to eject floppy disks before
3423 * installing the new fdutils package */
3424 if (cmd == CDROMEJECT || /* CD-ROM eject */
3425 cmd == 0x6470) { /* SunOS floppy eject */
3426 DPRINT("obsolete eject ioctl\n");
3427 DPRINT("please use floppycontrol --eject\n");
3431 if (!((cmd & 0xff00) == 0x0200))
3434 /* convert the old style command into a new style command */
3435 ret = normalize_ioctl(&cmd, &size);
3439 /* permission checks */
3440 if (((cmd & 0x40) && !(mode & (FMODE_WRITE | FMODE_WRITE_IOCTL))) ||
3441 ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)))
3444 if (WARN_ON(size < 0 || size > sizeof(inparam)))
3448 memset(&inparam, 0, sizeof(inparam));
3449 if (_IOC_DIR(cmd) & _IOC_WRITE) {
3450 ret = fd_copyin((void __user *)param, &inparam, size);
3457 if (UDRS->fd_ref != 1)
3458 /* somebody else has this drive open */
3460 if (lock_fdc(drive, true))
3463 /* do the actual eject. Fails on
3464 * non-Sparc architectures */
3465 ret = fd_eject(UNIT(drive));
3467 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
3468 set_bit(FD_VERIFY_BIT, &UDRS->flags);
3469 process_fd_request();
3472 if (lock_fdc(drive, true))
3474 current_type[drive] = NULL;
3475 floppy_sizes[drive] = MAX_DISK_SIZE << 1;
3476 UDRS->keep_data = 0;
3477 return invalidate_drive(bdev);
3480 return set_geometry(cmd, &inparam.g, drive, type, bdev);
3482 ret = get_floppy_geometry(drive, type,
3483 (struct floppy_struct **)&outparam);
3488 UDP->flags |= FTD_MSG;
3491 UDP->flags &= ~FTD_MSG;
3494 if (lock_fdc(drive, true))
3496 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3499 process_fd_request();
3500 if (ret & FD_VERIFY)
3502 if (!(ret & FD_DISK_WRITABLE))
3506 if (UDRS->fd_ref != 1)
3508 return do_format(drive, &inparam.f);
3511 if (lock_fdc(drive, true))
3513 return invalidate_drive(bdev);
3514 case FDSETEMSGTRESH:
3515 UDP->max_errors.reporting = (unsigned short)(param & 0x0f);
3518 outparam = &UDP->max_errors;
3521 UDP->max_errors = inparam.max_errors;
3524 outparam = drive_name(type, drive);
3525 SUPBOUND(size, strlen((const char *)outparam) + 1);
3534 if (lock_fdc(drive, true))
3536 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3538 process_fd_request();
3544 return user_reset_fdc(drive, (int)param, true);
3549 memset(UDRWE, 0, sizeof(*UDRWE));
3557 if (lock_fdc(drive, true))
3560 i = raw_cmd_ioctl(cmd, (void __user *)param);
3563 process_fd_request();
3566 if (lock_fdc(drive, true))
3569 process_fd_request();
3575 if (_IOC_DIR(cmd) & _IOC_READ)
3576 return fd_copyout((void __user *)param, outparam, size);
3581 static int fd_ioctl(struct block_device *bdev, fmode_t mode,
3582 unsigned int cmd, unsigned long param)
3586 mutex_lock(&floppy_mutex);
3587 ret = fd_locked_ioctl(bdev, mode, cmd, param);
3588 mutex_unlock(&floppy_mutex);
3593 static void __init config_types(void)
3595 bool has_drive = false;
3598 /* read drive info out of physical CMOS */
3601 UDP->cmos = FLOPPY0_TYPE;
3603 if (!UDP->cmos && FLOPPY1_TYPE)
3604 UDP->cmos = FLOPPY1_TYPE;
3606 /* FIXME: additional physical CMOS drive detection should go here */
3608 for (drive = 0; drive < N_DRIVE; drive++) {
3609 unsigned int type = UDP->cmos;
3610 struct floppy_drive_params *params;
3611 const char *name = NULL;
3612 static char temparea[32];
3614 if (type < ARRAY_SIZE(default_drive_params)) {
3615 params = &default_drive_params[type].params;
3617 name = default_drive_params[type].name;
3618 allowed_drive_mask |= 1 << drive;
3620 allowed_drive_mask &= ~(1 << drive);
3622 params = &default_drive_params[0].params;
3623 sprintf(temparea, "unknown type %d (usb?)", type);
3627 const char *prepend;
3631 pr_info("Floppy drive(s):");
3636 pr_cont("%s fd%d is %s", prepend, drive, name);
3645 static int floppy_release(struct gendisk *disk, fmode_t mode)
3647 int drive = (long)disk->private_data;
3649 mutex_lock(&floppy_mutex);
3650 mutex_lock(&open_lock);
3651 if (UDRS->fd_ref < 0)
3653 else if (!UDRS->fd_ref--) {
3654 DPRINT("floppy_release with fd_ref == 0");
3658 opened_bdev[drive] = NULL;
3659 mutex_unlock(&open_lock);
3660 mutex_unlock(&floppy_mutex);
3666 * floppy_open check for aliasing (/dev/fd0 can be the same as
3667 * /dev/PS0 etc), and disallows simultaneous access to the same
3668 * drive with different device numbers.
3670 static int floppy_open(struct block_device *bdev, fmode_t mode)
3672 int drive = (long)bdev->bd_disk->private_data;
3673 int old_dev, new_dev;
3678 mutex_lock(&floppy_mutex);
3679 mutex_lock(&open_lock);
3680 old_dev = UDRS->fd_device;
3681 if (opened_bdev[drive] && opened_bdev[drive] != bdev)
3684 if (!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)) {
3685 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
3686 set_bit(FD_VERIFY_BIT, &UDRS->flags);
3689 if (UDRS->fd_ref == -1 || (UDRS->fd_ref && (mode & FMODE_EXCL)))
3692 if (mode & FMODE_EXCL)
3697 opened_bdev[drive] = bdev;
3701 if (!floppy_track_buffer) {
3702 /* if opening an ED drive, reserve a big buffer,
3703 * else reserve a small one */
3704 if ((UDP->cmos == 6) || (UDP->cmos == 5))
3705 try = 64; /* Only 48 actually useful */
3707 try = 32; /* Only 24 actually useful */
3709 tmp = (char *)fd_dma_mem_alloc(1024 * try);
3710 if (!tmp && !floppy_track_buffer) {
3711 try >>= 1; /* buffer only one side */
3713 tmp = (char *)fd_dma_mem_alloc(1024 * try);
3715 if (!tmp && !floppy_track_buffer)
3716 fallback_on_nodma_alloc(&tmp, 2048 * try);
3717 if (!tmp && !floppy_track_buffer) {
3718 DPRINT("Unable to allocate DMA memory\n");
3721 if (floppy_track_buffer) {
3723 fd_dma_mem_free((unsigned long)tmp, try * 1024);
3725 buffer_min = buffer_max = -1;
3726 floppy_track_buffer = tmp;
3727 max_buffer_sectors = try;
3731 new_dev = MINOR(bdev->bd_dev);
3732 UDRS->fd_device = new_dev;
3733 set_capacity(disks[drive], floppy_sizes[new_dev]);
3734 if (old_dev != -1 && old_dev != new_dev) {
3735 if (buffer_drive == drive)
3739 if (UFDCS->rawcmd == 1)
3742 if (!(mode & FMODE_NDELAY)) {
3743 if (mode & (FMODE_READ|FMODE_WRITE)) {
3744 UDRS->last_checked = 0;
3745 check_disk_change(bdev);
3746 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags))
3750 if ((mode & FMODE_WRITE) &&
3751 !test_bit(FD_DISK_WRITABLE_BIT, &UDRS->flags))
3754 mutex_unlock(&open_lock);
3755 mutex_unlock(&floppy_mutex);
3758 if (UDRS->fd_ref < 0)
3763 opened_bdev[drive] = NULL;
3765 mutex_unlock(&open_lock);
3766 mutex_unlock(&floppy_mutex);
3771 * Check if the disk has been changed or if a change has been faked.
3773 static unsigned int floppy_check_events(struct gendisk *disk,
3774 unsigned int clearing)
3776 int drive = (long)disk->private_data;
3778 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
3779 test_bit(FD_VERIFY_BIT, &UDRS->flags))
3780 return DISK_EVENT_MEDIA_CHANGE;
3782 if (time_after(jiffies, UDRS->last_checked + UDP->checkfreq)) {
3783 lock_fdc(drive, false);
3784 poll_drive(false, 0);
3785 process_fd_request();
3788 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
3789 test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
3790 test_bit(drive, &fake_change) ||
3791 drive_no_geom(drive))
3792 return DISK_EVENT_MEDIA_CHANGE;
3797 * This implements "read block 0" for floppy_revalidate().
3798 * Needed for format autodetection, checking whether there is
3799 * a disk in the drive, and whether that disk is writable.
3802 static void floppy_rb0_complete(struct bio *bio, int err)
3804 complete((struct completion *)bio->bi_private);
3807 static int __floppy_read_block_0(struct block_device *bdev)
3810 struct bio_vec bio_vec;
3811 struct completion complete;
3815 page = alloc_page(GFP_NOIO);
3817 process_fd_request();
3821 size = bdev->bd_block_size;
3826 bio.bi_io_vec = &bio_vec;
3827 bio_vec.bv_page = page;
3828 bio_vec.bv_len = size;
3829 bio_vec.bv_offset = 0;
3835 bio.bi_flags = BIO_QUIET;
3836 init_completion(&complete);
3837 bio.bi_private = &complete;
3838 bio.bi_end_io = floppy_rb0_complete;
3840 submit_bio(READ, &bio);
3841 process_fd_request();
3842 wait_for_completion(&complete);
3849 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
3850 * the bootblock (block 0). "Autodetection" is also needed to check whether
3851 * there is a disk in the drive at all... Thus we also do it for fixed
3852 * geometry formats */
3853 static int floppy_revalidate(struct gendisk *disk)
3855 int drive = (long)disk->private_data;
3859 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
3860 test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
3861 test_bit(drive, &fake_change) ||
3862 drive_no_geom(drive)) {
3863 if (WARN(atomic_read(&usage_count) == 0,
3864 "VFS: revalidate called on non-open device.\n"))
3867 lock_fdc(drive, false);
3868 cf = (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
3869 test_bit(FD_VERIFY_BIT, &UDRS->flags));
3870 if (!(cf || test_bit(drive, &fake_change) || drive_no_geom(drive))) {
3871 process_fd_request(); /*already done by another thread */
3876 if (buffer_drive == drive)
3878 clear_bit(drive, &fake_change);
3879 clear_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
3882 if (drive_no_geom(drive)) {
3884 res = __floppy_read_block_0(opened_bdev[drive]);
3887 poll_drive(false, FD_RAW_NEED_DISK);
3888 process_fd_request();
3891 set_capacity(disk, floppy_sizes[UDRS->fd_device]);
3895 static const struct block_device_operations floppy_fops = {
3896 .owner = THIS_MODULE,
3897 .open = floppy_open,
3898 .release = floppy_release,
3900 .getgeo = fd_getgeo,
3901 .check_events = floppy_check_events,
3902 .revalidate_disk = floppy_revalidate,
3906 * Floppy Driver initialization
3907 * =============================
3910 /* Determine the floppy disk controller type */
3911 /* This routine was written by David C. Niemi */
3912 static char __init get_fdc_version(void)
3916 output_byte(FD_DUMPREGS); /* 82072 and better know DUMPREGS */
3921 return FDC_NONE; /* No FDC present ??? */
3922 if ((r == 1) && (reply_buffer[0] == 0x80)) {
3923 pr_info("FDC %d is an 8272A\n", fdc);
3924 return FDC_8272A; /* 8272a/765 don't know DUMPREGS */
3927 pr_info("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
3932 if (!fdc_configure()) {
3933 pr_info("FDC %d is an 82072\n", fdc);
3934 return FDC_82072; /* 82072 doesn't know CONFIGURE */
3937 output_byte(FD_PERPENDICULAR);
3938 if (need_more_output() == MORE_OUTPUT) {
3941 pr_info("FDC %d is an 82072A\n", fdc);
3942 return FDC_82072A; /* 82072A as found on Sparcs. */
3945 output_byte(FD_UNLOCK);
3947 if ((r == 1) && (reply_buffer[0] == 0x80)) {
3948 pr_info("FDC %d is a pre-1991 82077\n", fdc);
3949 return FDC_82077_ORIG; /* Pre-1991 82077, doesn't know
3952 if ((r != 1) || (reply_buffer[0] != 0x00)) {
3953 pr_info("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
3957 output_byte(FD_PARTID);
3960 pr_info("FDC %d init: PARTID: unexpected return of %d bytes.\n",
3964 if (reply_buffer[0] == 0x80) {
3965 pr_info("FDC %d is a post-1991 82077\n", fdc);
3966 return FDC_82077; /* Revised 82077AA passes all the tests */
3968 switch (reply_buffer[0] >> 5) {
3970 /* Either a 82078-1 or a 82078SL running at 5Volt */
3971 pr_info("FDC %d is an 82078.\n", fdc);
3974 pr_info("FDC %d is a 44pin 82078\n", fdc);
3977 pr_info("FDC %d is a S82078B\n", fdc);
3980 pr_info("FDC %d is a National Semiconductor PC87306\n", fdc);
3983 pr_info("FDC %d init: 82078 variant with unknown PARTID=%d.\n",
3984 fdc, reply_buffer[0] >> 5);
3985 return FDC_82078_UNKN;
3987 } /* get_fdc_version */
3989 /* lilo configuration */
3991 static void __init floppy_set_flags(int *ints, int param, int param2)
3995 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
3997 default_drive_params[i].params.flags |= param2;
3999 default_drive_params[i].params.flags &= ~param2;
4001 DPRINT("%s flag 0x%x\n", param2 ? "Setting" : "Clearing", param);
4004 static void __init daring(int *ints, int param, int param2)
4008 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
4010 default_drive_params[i].params.select_delay = 0;
4011 default_drive_params[i].params.flags |=
4012 FD_SILENT_DCL_CLEAR;
4014 default_drive_params[i].params.select_delay =
4016 default_drive_params[i].params.flags &=
4017 ~FD_SILENT_DCL_CLEAR;
4020 DPRINT("Assuming %s floppy hardware\n", param ? "standard" : "broken");
4023 static void __init set_cmos(int *ints, int dummy, int dummy2)
4025 int current_drive = 0;
4028 DPRINT("wrong number of parameters for CMOS\n");
4031 current_drive = ints[1];
4032 if (current_drive < 0 || current_drive >= 8) {
4033 DPRINT("bad drive for set_cmos\n");
4037 if (current_drive >= 4 && !FDC2)
4041 DPRINT("setting CMOS code to %d\n", ints[2]);
4044 static struct param_table {
4046 void (*fn) (int *ints, int param, int param2);
4050 } config_params[] __initdata = {
4051 {"allowed_drive_mask", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4052 {"all_drives", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4053 {"asus_pci", NULL, &allowed_drive_mask, 0x33, 0},
4054 {"irq", NULL, &FLOPPY_IRQ, 6, 0},
4055 {"dma", NULL, &FLOPPY_DMA, 2, 0},
4056 {"daring", daring, NULL, 1, 0},
4058 {"two_fdc", NULL, &FDC2, 0x370, 0},
4059 {"one_fdc", NULL, &FDC2, 0, 0},
4061 {"thinkpad", floppy_set_flags, NULL, 1, FD_INVERTED_DCL},
4062 {"broken_dcl", floppy_set_flags, NULL, 1, FD_BROKEN_DCL},
4063 {"messages", floppy_set_flags, NULL, 1, FTD_MSG},
4064 {"silent_dcl_clear", floppy_set_flags, NULL, 1, FD_SILENT_DCL_CLEAR},
4065 {"debug", floppy_set_flags, NULL, 1, FD_DEBUG},
4066 {"nodma", NULL, &can_use_virtual_dma, 1, 0},
4067 {"omnibook", NULL, &can_use_virtual_dma, 1, 0},
4068 {"yesdma", NULL, &can_use_virtual_dma, 0, 0},
4069 {"fifo_depth", NULL, &fifo_depth, 0xa, 0},
4070 {"nofifo", NULL, &no_fifo, 0x20, 0},
4071 {"usefifo", NULL, &no_fifo, 0, 0},
4072 {"cmos", set_cmos, NULL, 0, 0},
4073 {"slow", NULL, &slow_floppy, 1, 0},
4074 {"unexpected_interrupts", NULL, &print_unex, 1, 0},
4075 {"no_unexpected_interrupts", NULL, &print_unex, 0, 0},
4076 {"L40SX", NULL, &print_unex, 0, 0}
4081 static int __init floppy_setup(char *str)
4087 str = get_options(str, ARRAY_SIZE(ints), ints);
4089 for (i = 0; i < ARRAY_SIZE(config_params); i++) {
4090 if (strcmp(str, config_params[i].name) == 0) {
4094 param = config_params[i].def_param;
4095 if (config_params[i].fn)
4096 config_params[i].fn(ints, param,
4099 if (config_params[i].var) {
4100 DPRINT("%s=%d\n", str, param);
4101 *config_params[i].var = param;
4108 DPRINT("unknown floppy option [%s]\n", str);
4110 DPRINT("allowed options are:");
4111 for (i = 0; i < ARRAY_SIZE(config_params); i++)
4112 pr_cont(" %s", config_params[i].name);
4115 DPRINT("botched floppy option\n");
4116 DPRINT("Read Documentation/blockdev/floppy.txt\n");
4120 static int have_no_fdc = -ENODEV;
4122 static ssize_t floppy_cmos_show(struct device *dev,
4123 struct device_attribute *attr, char *buf)
4125 struct platform_device *p = to_platform_device(dev);
4129 return sprintf(buf, "%X\n", UDP->cmos);
4132 static DEVICE_ATTR(cmos, S_IRUGO, floppy_cmos_show, NULL);
4134 static void floppy_device_release(struct device *dev)
4138 static int floppy_resume(struct device *dev)
4142 for (fdc = 0; fdc < N_FDC; fdc++)
4143 if (FDCS->address != -1)
4144 user_reset_fdc(-1, FD_RESET_ALWAYS, false);
4149 static const struct dev_pm_ops floppy_pm_ops = {
4150 .resume = floppy_resume,
4151 .restore = floppy_resume,
4154 static struct platform_driver floppy_driver = {
4157 .pm = &floppy_pm_ops,
4161 static struct platform_device floppy_device[N_DRIVE];
4163 static struct kobject *floppy_find(dev_t dev, int *part, void *data)
4165 int drive = (*part & 3) | ((*part & 0x80) >> 5);
4166 if (drive >= N_DRIVE ||
4167 !(allowed_drive_mask & (1 << drive)) ||
4168 fdc_state[FDC(drive)].version == FDC_NONE)
4170 if (((*part >> 2) & 0x1f) >= ARRAY_SIZE(floppy_type))
4173 return get_disk(disks[drive]);
4176 static int __init floppy_init(void)
4182 interruptjiffies = resultjiffies = jiffies;
4184 #if defined(CONFIG_PPC)
4185 if (check_legacy_ioport(FDC1))
4191 for (dr = 0; dr < N_DRIVE; dr++) {
4192 disks[dr] = alloc_disk(1);
4198 disks[dr]->queue = blk_init_queue(do_fd_request, &floppy_lock);
4199 if (!disks[dr]->queue) {
4204 blk_queue_max_hw_sectors(disks[dr]->queue, 64);
4205 disks[dr]->major = FLOPPY_MAJOR;
4206 disks[dr]->first_minor = TOMINOR(dr);
4207 disks[dr]->fops = &floppy_fops;
4208 sprintf(disks[dr]->disk_name, "fd%d", dr);
4210 init_timer(&motor_off_timer[dr]);
4211 motor_off_timer[dr].data = dr;
4212 motor_off_timer[dr].function = motor_off_callback;
4215 err = register_blkdev(FLOPPY_MAJOR, "fd");
4219 err = platform_driver_register(&floppy_driver);
4221 goto out_unreg_blkdev;
4223 blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
4224 floppy_find, NULL, NULL);
4226 for (i = 0; i < 256; i++)
4228 floppy_sizes[i] = floppy_type[ITYPE(i)].size;
4230 floppy_sizes[i] = MAX_DISK_SIZE << 1;
4232 reschedule_timeout(MAXTIMEOUT, "floppy init");
4235 for (i = 0; i < N_FDC; i++) {
4237 memset(FDCS, 0, sizeof(*FDCS));
4240 #if defined(__sparc__) || defined(__mc68000__)
4241 /*sparcs/sun3x don't have a DOR reset which we can fall back on to */
4245 FDCS->version = FDC_82072A;
4249 use_virtual_dma = can_use_virtual_dma & 1;
4250 fdc_state[0].address = FDC1;
4251 if (fdc_state[0].address == -1) {
4252 del_timer_sync(&fd_timeout);
4254 goto out_unreg_region;
4257 fdc_state[1].address = FDC2;
4260 fdc = 0; /* reset fdc in case of unexpected interrupt */
4261 err = floppy_grab_irq_and_dma();
4263 del_timer_sync(&fd_timeout);
4265 goto out_unreg_region;
4268 /* initialise drive state */
4269 for (drive = 0; drive < N_DRIVE; drive++) {
4270 memset(UDRS, 0, sizeof(*UDRS));
4271 memset(UDRWE, 0, sizeof(*UDRWE));
4272 set_bit(FD_DISK_NEWCHANGE_BIT, &UDRS->flags);
4273 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
4274 set_bit(FD_VERIFY_BIT, &UDRS->flags);
4275 UDRS->fd_device = -1;
4276 floppy_track_buffer = NULL;
4277 max_buffer_sectors = 0;
4280 * Small 10 msec delay to let through any interrupt that
4281 * initialization might have triggered, to not
4282 * confuse detection:
4286 for (i = 0; i < N_FDC; i++) {
4288 FDCS->driver_version = FD_DRIVER_VERSION;
4289 for (unit = 0; unit < 4; unit++)
4290 FDCS->track[unit] = 0;
4291 if (FDCS->address == -1)
4294 if (user_reset_fdc(-1, FD_RESET_ALWAYS, false)) {
4295 /* free ioports reserved by floppy_grab_irq_and_dma() */
4296 floppy_release_regions(fdc);
4298 FDCS->version = FDC_NONE;
4301 /* Try to determine the floppy controller type */
4302 FDCS->version = get_fdc_version();
4303 if (FDCS->version == FDC_NONE) {
4304 /* free ioports reserved by floppy_grab_irq_and_dma() */
4305 floppy_release_regions(fdc);
4309 if (can_use_virtual_dma == 2 && FDCS->version < FDC_82072A)
4310 can_use_virtual_dma = 0;
4313 /* Not all FDCs seem to be able to handle the version command
4314 * properly, so force a reset for the standard FDC clones,
4315 * to avoid interrupt garbage.
4317 user_reset_fdc(-1, FD_RESET_ALWAYS, false);
4320 del_timer_sync(&fd_timeout);
4324 DPRINT("no floppy controllers found\n");
4326 goto out_flush_work;
4329 for (drive = 0; drive < N_DRIVE; drive++) {
4330 if (!(allowed_drive_mask & (1 << drive)))
4332 if (fdc_state[FDC(drive)].version == FDC_NONE)
4335 floppy_device[drive].name = floppy_device_name;
4336 floppy_device[drive].id = drive;
4337 floppy_device[drive].dev.release = floppy_device_release;
4339 err = platform_device_register(&floppy_device[drive]);
4341 goto out_flush_work;
4343 err = device_create_file(&floppy_device[drive].dev,
4346 goto out_unreg_platform_dev;
4348 /* to be cleaned up... */
4349 disks[drive]->private_data = (void *)(long)drive;
4350 disks[drive]->flags |= GENHD_FL_REMOVABLE;
4351 disks[drive]->driverfs_dev = &floppy_device[drive].dev;
4352 add_disk(disks[drive]);
4357 out_unreg_platform_dev:
4358 platform_device_unregister(&floppy_device[drive]);
4360 flush_work_sync(&floppy_work);
4361 if (atomic_read(&usage_count))
4362 floppy_release_irq_and_dma();
4364 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4365 platform_driver_unregister(&floppy_driver);
4367 unregister_blkdev(FLOPPY_MAJOR, "fd");
4370 del_timer_sync(&motor_off_timer[dr]);
4371 if (disks[dr]->queue)
4372 blk_cleanup_queue(disks[dr]->queue);
4373 put_disk(disks[dr]);
4378 static const struct io_region {
4383 /* address + 3 is sometimes reserved by pnp bios for motherboard */
4385 /* address + 6 is reserved, and may be taken by IDE.
4386 * Unfortunately, Adaptec doesn't know this :-(, */
4390 static void floppy_release_allocated_regions(int fdc, const struct io_region *p)
4392 while (p != io_regions) {
4394 release_region(FDCS->address + p->offset, p->size);
4398 #define ARRAY_END(X) (&((X)[ARRAY_SIZE(X)]))
4400 static int floppy_request_regions(int fdc)
4402 const struct io_region *p;
4404 for (p = io_regions; p < ARRAY_END(io_regions); p++) {
4405 if (!request_region(FDCS->address + p->offset,
4406 p->size, "floppy")) {
4407 DPRINT("Floppy io-port 0x%04lx in use\n",
4408 FDCS->address + p->offset);
4409 floppy_release_allocated_regions(fdc, p);
4416 static void floppy_release_regions(int fdc)
4418 floppy_release_allocated_regions(fdc, ARRAY_END(io_regions));
4421 static int floppy_grab_irq_and_dma(void)
4423 if (atomic_inc_return(&usage_count) > 1)
4427 * We might have scheduled a free_irq(), wait it to
4430 flush_work_sync(&floppy_work);
4432 if (fd_request_irq()) {
4433 DPRINT("Unable to grab IRQ%d for the floppy driver\n",
4435 atomic_dec(&usage_count);
4438 if (fd_request_dma()) {
4439 DPRINT("Unable to grab DMA%d for the floppy driver\n",
4441 if (can_use_virtual_dma & 2)
4442 use_virtual_dma = can_use_virtual_dma = 1;
4443 if (!(can_use_virtual_dma & 1)) {
4445 atomic_dec(&usage_count);
4450 for (fdc = 0; fdc < N_FDC; fdc++) {
4451 if (FDCS->address != -1) {
4452 if (floppy_request_regions(fdc))
4456 for (fdc = 0; fdc < N_FDC; fdc++) {
4457 if (FDCS->address != -1) {
4459 fd_outb(FDCS->dor, FD_DOR);
4463 set_dor(0, ~0, 8); /* avoid immediate interrupt */
4465 for (fdc = 0; fdc < N_FDC; fdc++)
4466 if (FDCS->address != -1)
4467 fd_outb(FDCS->dor, FD_DOR);
4469 * The driver will try and free resources and relies on us
4470 * to know if they were allocated or not.
4473 irqdma_allocated = 1;
4479 floppy_release_regions(fdc);
4480 atomic_dec(&usage_count);
4484 static void floppy_release_irq_and_dma(void)
4491 unsigned long tmpaddr;
4493 if (!atomic_dec_and_test(&usage_count))
4496 if (irqdma_allocated) {
4500 irqdma_allocated = 0;
4506 floppy_enable_hlt();
4508 if (floppy_track_buffer && max_buffer_sectors) {
4509 tmpsize = max_buffer_sectors * 1024;
4510 tmpaddr = (unsigned long)floppy_track_buffer;
4511 floppy_track_buffer = NULL;
4512 max_buffer_sectors = 0;
4513 buffer_min = buffer_max = -1;
4514 fd_dma_mem_free(tmpaddr, tmpsize);
4517 for (drive = 0; drive < N_FDC * 4; drive++)
4518 if (timer_pending(motor_off_timer + drive))
4519 pr_info("motor off timer %d still active\n", drive);
4522 if (timer_pending(&fd_timeout))
4523 pr_info("floppy timer still active:%s\n", timeout_message);
4524 if (timer_pending(&fd_timer))
4525 pr_info("auxiliary floppy timer still active\n");
4526 if (work_pending(&floppy_work))
4527 pr_info("work still pending\n");
4529 for (fdc = 0; fdc < N_FDC; fdc++)
4530 if (FDCS->address != -1)
4531 floppy_release_regions(fdc);
4537 static char *floppy;
4539 static void __init parse_floppy_cfg_string(char *cfg)
4545 while (*cfg && *cfg != ' ' && *cfg != '\t')
4556 static int __init floppy_module_init(void)
4559 parse_floppy_cfg_string(floppy);
4560 return floppy_init();
4562 module_init(floppy_module_init);
4564 static void __exit floppy_module_exit(void)
4568 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4569 unregister_blkdev(FLOPPY_MAJOR, "fd");
4570 platform_driver_unregister(&floppy_driver);
4572 for (drive = 0; drive < N_DRIVE; drive++) {
4573 del_timer_sync(&motor_off_timer[drive]);
4575 if ((allowed_drive_mask & (1 << drive)) &&
4576 fdc_state[FDC(drive)].version != FDC_NONE) {
4577 del_gendisk(disks[drive]);
4578 device_remove_file(&floppy_device[drive].dev, &dev_attr_cmos);
4579 platform_device_unregister(&floppy_device[drive]);
4581 blk_cleanup_queue(disks[drive]->queue);
4582 put_disk(disks[drive]);
4585 del_timer_sync(&fd_timeout);
4586 del_timer_sync(&fd_timer);
4588 if (atomic_read(&usage_count))
4589 floppy_release_irq_and_dma();
4591 /* eject disk, if any */
4595 module_exit(floppy_module_exit);
4597 module_param(floppy, charp, 0);
4598 module_param(FLOPPY_IRQ, int, 0);
4599 module_param(FLOPPY_DMA, int, 0);
4600 MODULE_AUTHOR("Alain L. Knaff");
4601 MODULE_SUPPORTED_DEVICE("fd");
4602 MODULE_LICENSE("GPL");
4604 /* This doesn't actually get used other than for module information */
4605 static const struct pnp_device_id floppy_pnpids[] = {
4610 MODULE_DEVICE_TABLE(pnp, floppy_pnpids);
4614 __setup("floppy=", floppy_setup);
4615 module_init(floppy_init)
4618 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);