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/buffer_head.h> /* for invalidate_buffers() */
192 #include <linux/mutex.h>
193 #include <linux/io.h>
194 #include <linux/uaccess.h>
197 * PS/2 floppies have much slower step rates than regular floppies.
198 * It's been recommended that take about 1/4 of the default speed
199 * in some more extreme cases.
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 struct request_queue *floppy_queue;
261 static void do_fd_request(struct request_queue *q);
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;
417 * This struct defines the different floppy types.
419 * Bit 0 of 'stretch' tells if the tracks need to be doubled for some
420 * types (e.g. 360kB diskette in 1.2MB drive, etc.). Bit 1 of 'stretch'
421 * tells if the disk is in Commodore 1581 format, which means side 0 sectors
422 * are located on side 1 of the disk but with a side 0 ID, and vice-versa.
423 * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
424 * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
425 * side 0 is on physical side 0 (but with the misnamed sector IDs).
426 * 'stretch' should probably be renamed to something more general, like
429 * Bits 2 through 9 of 'stretch' tell the number of the first sector.
430 * The LSB (bit 2) is flipped. For most disks, the first sector
431 * is 1 (represented by 0x00<<2). For some CP/M and music sampler
432 * disks (such as Ensoniq EPS 16plus) it is 0 (represented as 0x01<<2).
433 * For Amstrad CPC disks it is 0xC1 (represented as 0xC0<<2).
435 * Other parameters should be self-explanatory (see also setfdprm(8)).
444 | | | | | | Data rate, | 0x40 for perp
445 | | | | | | | Spec1 (stepping rate, head unload
446 | | | | | | | | /fmt gap (gap2) */
447 static struct floppy_struct floppy_type[32] = {
448 { 0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL }, /* 0 no testing */
449 { 720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360" }, /* 1 360KB PC */
450 { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /* 2 1.2MB AT */
451 { 720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360" }, /* 3 360KB SS 3.5" */
452 { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720" }, /* 4 720KB 3.5" */
453 { 720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360" }, /* 5 360KB AT */
454 { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720" }, /* 6 720KB AT */
455 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /* 7 1.44MB 3.5" */
456 { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /* 8 2.88MB 3.5" */
457 { 6240,39,2,80,0,0x1B,0x43,0xAF,0x28,"E3120" }, /* 9 3.12MB 3.5" */
459 { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25" */
460 { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5" */
461 { 820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410" }, /* 12 410KB 5.25" */
462 { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820" }, /* 13 820KB 3.5" */
463 { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25" */
464 { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5" */
465 { 840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420" }, /* 16 420KB 5.25" */
466 { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830" }, /* 17 830KB 3.5" */
467 { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25" */
468 { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5" */
470 { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880" }, /* 20 880KB 5.25" */
471 { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5" */
472 { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5" */
473 { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25" */
474 { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5" */
475 { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5" */
476 { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5" */
477 { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5" */
478 { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5" */
479 { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5" */
481 { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800" }, /* 30 800KB 3.5" */
482 { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5" */
485 #define SECTSIZE (_FD_SECTSIZE(*floppy))
487 /* Auto-detection: Disk type used until the next media change occurs. */
488 static struct floppy_struct *current_type[N_DRIVE];
491 * User-provided type information. current_type points to
492 * the respective entry of this array.
494 static struct floppy_struct user_params[N_DRIVE];
496 static sector_t floppy_sizes[256];
498 static char floppy_device_name[] = "floppy";
501 * The driver is trying to determine the correct media format
502 * while probing is set. rw_interrupt() clears it after a
507 /* Synchronization of FDC access. */
508 #define FD_COMMAND_NONE -1
509 #define FD_COMMAND_ERROR 2
510 #define FD_COMMAND_OKAY 3
512 static volatile int command_status = FD_COMMAND_NONE;
513 static unsigned long fdc_busy;
514 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
515 static DECLARE_WAIT_QUEUE_HEAD(command_done);
517 /* Errors during formatting are counted here. */
518 static int format_errors;
520 /* Format request descriptor. */
521 static struct format_descr format_req;
524 * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
525 * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
526 * H is head unload time (1=16ms, 2=32ms, etc)
531 * Because these are written to by the DMA controller, they must
532 * not contain a 64k byte boundary crossing, or data will be
535 static char *floppy_track_buffer;
536 static int max_buffer_sectors;
539 typedef void (*done_f)(int);
540 static struct cont_t {
541 void (*interrupt)(void);
542 /* this is called after the interrupt of the
544 void (*redo)(void); /* this is called to retry the operation */
545 void (*error)(void); /* this is called to tally an error */
546 done_f done; /* this is called to say if the operation has
547 * succeeded/failed */
550 static void floppy_ready(void);
551 static void floppy_start(void);
552 static void process_fd_request(void);
553 static void recalibrate_floppy(void);
554 static void floppy_shutdown(unsigned long);
556 static int floppy_request_regions(int);
557 static void floppy_release_regions(int);
558 static int floppy_grab_irq_and_dma(void);
559 static void floppy_release_irq_and_dma(void);
562 * The "reset" variable should be tested whenever an interrupt is scheduled,
563 * after the commands have been sent. This is to ensure that the driver doesn't
564 * get wedged when the interrupt doesn't come because of a failed command.
565 * reset doesn't need to be tested before sending commands, because
566 * output_byte is automatically disabled when reset is set.
568 static void reset_fdc(void);
571 * These are global variables, as that's the easiest way to give
572 * information to interrupts. They are the data used for the current
576 #define NEED_1_RECAL -2
577 #define NEED_2_RECAL -3
579 static atomic_t usage_count = ATOMIC_INIT(0);
581 /* buffer related variables */
582 static int buffer_track = -1;
583 static int buffer_drive = -1;
584 static int buffer_min = -1;
585 static int buffer_max = -1;
587 /* fdc related variables, should end up in a struct */
588 static struct floppy_fdc_state fdc_state[N_FDC];
589 static int fdc; /* current fdc */
591 static struct floppy_struct *_floppy = floppy_type;
592 static unsigned char current_drive;
593 static long current_count_sectors;
594 static unsigned char fsector_t; /* sector in track */
595 static unsigned char in_sector_offset; /* offset within physical sector,
596 * expressed in units of 512 bytes */
599 static inline int fd_eject(int drive)
610 static long unsigned debugtimer;
612 static inline void set_debugt(void)
614 debugtimer = jiffies;
617 static inline void debugt(const char *func, const char *msg)
619 if (DP->flags & DEBUGT)
620 pr_info("%s:%s dtime=%lu\n", func, msg, jiffies - debugtimer);
623 static inline void set_debugt(void) { }
624 static inline void debugt(const char *func, const char *msg) { }
627 typedef void (*timeout_fn)(unsigned long);
628 static DEFINE_TIMER(fd_timeout, floppy_shutdown, 0, 0);
630 static const char *timeout_message;
632 static void is_alive(const char *func, const char *message)
634 /* this routine checks whether the floppy driver is "alive" */
635 if (test_bit(0, &fdc_busy) && command_status < 2 &&
636 !timer_pending(&fd_timeout)) {
637 DPRINT("%s: timeout handler died. %s\n", func, message);
641 static void (*do_floppy)(void) = NULL;
645 static void (*lasthandler)(void);
646 static unsigned long interruptjiffies;
647 static unsigned long resultjiffies;
648 static int resultsize;
649 static unsigned long lastredo;
651 static struct output_log {
653 unsigned char status;
654 unsigned long jiffies;
655 } output_log[OLOGSIZE];
657 static int output_log_pos;
659 #define current_reqD -1
660 #define MAXTIMEOUT -2
662 static void __reschedule_timeout(int drive, const char *message)
664 if (drive == current_reqD)
665 drive = current_drive;
666 del_timer(&fd_timeout);
667 if (drive < 0 || drive >= N_DRIVE) {
668 fd_timeout.expires = jiffies + 20UL * HZ;
671 fd_timeout.expires = jiffies + UDP->timeout;
672 add_timer(&fd_timeout);
673 if (UDP->flags & FD_DEBUG)
674 DPRINT("reschedule timeout %s\n", message);
675 timeout_message = message;
678 static void reschedule_timeout(int drive, const char *message)
682 spin_lock_irqsave(&floppy_lock, flags);
683 __reschedule_timeout(drive, message);
684 spin_unlock_irqrestore(&floppy_lock, flags);
687 #define INFBOUND(a, b) (a) = max_t(int, a, b)
688 #define SUPBOUND(a, b) (a) = min_t(int, a, b)
691 * Bottom half floppy driver.
692 * ==========================
694 * This part of the file contains the code talking directly to the hardware,
695 * and also the main service loop (seek-configure-spinup-command)
700 * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
701 * and the last_checked date.
703 * last_checked is the date of the last check which showed 'no disk change'
704 * FD_DISK_CHANGE is set under two conditions:
705 * 1. The floppy has been changed after some i/o to that floppy already
707 * 2. No floppy disk is in the drive. This is done in order to ensure that
708 * requests are quickly flushed in case there is no disk in the drive. It
709 * follows that FD_DISK_CHANGE can only be cleared if there is a disk in
712 * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
713 * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
714 * each seek. If a disk is present, the disk change line should also be
715 * cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
716 * change line is set, this means either that no disk is in the drive, or
717 * that it has been removed since the last seek.
719 * This means that we really have a third possibility too:
720 * The floppy has been changed after the last seek.
723 static int disk_change(int drive)
725 int fdc = FDC(drive);
727 if (time_before(jiffies, UDRS->select_date + UDP->select_delay))
728 DPRINT("WARNING disk change called early\n");
729 if (!(FDCS->dor & (0x10 << UNIT(drive))) ||
730 (FDCS->dor & 3) != UNIT(drive) || fdc != FDC(drive)) {
731 DPRINT("probing disk change on unselected drive\n");
732 DPRINT("drive=%d fdc=%d dor=%x\n", drive, FDC(drive),
733 (unsigned int)FDCS->dor);
736 debug_dcl(UDP->flags,
737 "checking disk change line for drive %d\n", drive);
738 debug_dcl(UDP->flags, "jiffies=%lu\n", jiffies);
739 debug_dcl(UDP->flags, "disk change line=%x\n", fd_inb(FD_DIR) & 0x80);
740 debug_dcl(UDP->flags, "flags=%lx\n", UDRS->flags);
742 if (UDP->flags & FD_BROKEN_DCL)
743 return test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
744 if ((fd_inb(FD_DIR) ^ UDP->flags) & 0x80) {
745 set_bit(FD_VERIFY_BIT, &UDRS->flags);
746 /* verify write protection */
748 if (UDRS->maxblock) /* mark it changed */
749 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
751 /* invalidate its geometry */
752 if (UDRS->keep_data >= 0) {
753 if ((UDP->flags & FTD_MSG) &&
754 current_type[drive] != NULL)
755 DPRINT("Disk type is undefined after disk change\n");
756 current_type[drive] = NULL;
757 floppy_sizes[TOMINOR(drive)] = MAX_DISK_SIZE << 1;
762 UDRS->last_checked = jiffies;
763 clear_bit(FD_DISK_NEWCHANGE_BIT, &UDRS->flags);
768 static inline int is_selected(int dor, int unit)
770 return ((dor & (0x10 << unit)) && (dor & 3) == unit);
773 static bool is_ready_state(int status)
775 int state = status & (STATUS_READY | STATUS_DIR | STATUS_DMA);
776 return state == STATUS_READY;
779 static int set_dor(int fdc, char mask, char data)
783 unsigned char newdor;
784 unsigned char olddor;
786 if (FDCS->address == -1)
790 newdor = (olddor & mask) | data;
791 if (newdor != olddor) {
793 if (is_selected(olddor, unit) && !is_selected(newdor, unit)) {
794 drive = REVDRIVE(fdc, unit);
795 debug_dcl(UDP->flags,
796 "calling disk change from set_dor\n");
800 fd_outb(newdor, FD_DOR);
803 if (!is_selected(olddor, unit) && is_selected(newdor, unit)) {
804 drive = REVDRIVE(fdc, unit);
805 UDRS->select_date = jiffies;
811 static void twaddle(void)
813 if (DP->select_delay)
815 fd_outb(FDCS->dor & ~(0x10 << UNIT(current_drive)), FD_DOR);
816 fd_outb(FDCS->dor, FD_DOR);
817 DRS->select_date = jiffies;
821 * Reset all driver information about the current fdc.
822 * This is needed after a reset, and after a raw command.
824 static void reset_fdc_info(int mode)
828 FDCS->spec1 = FDCS->spec2 = -1;
829 FDCS->need_configure = 1;
832 for (drive = 0; drive < N_DRIVE; drive++)
833 if (FDC(drive) == fdc && (mode || UDRS->track != NEED_1_RECAL))
834 UDRS->track = NEED_2_RECAL;
837 /* selects the fdc and drive, and enables the fdc's input/dma. */
838 static void set_fdc(int drive)
840 if (drive >= 0 && drive < N_DRIVE) {
842 current_drive = drive;
844 if (fdc != 1 && fdc != 0) {
845 pr_info("bad fdc value\n");
850 set_dor(1 - fdc, ~8, 0);
852 if (FDCS->rawcmd == 2)
854 if (fd_inb(FD_STATUS) != STATUS_READY)
858 /* locks the driver */
859 static int lock_fdc(int drive, bool interruptible)
861 if (WARN(atomic_read(&usage_count) == 0,
862 "Trying to lock fdc while usage count=0\n"))
865 if (wait_event_interruptible(fdc_wait, !test_and_set_bit(0, &fdc_busy)))
868 command_status = FD_COMMAND_NONE;
870 __reschedule_timeout(drive, "lock fdc");
875 /* unlocks the driver */
876 static void unlock_fdc(void)
881 if (!test_bit(0, &fdc_busy))
882 DPRINT("FDC access conflict!\n");
885 DPRINT("device interrupt still active at FDC release: %pf!\n",
887 command_status = FD_COMMAND_NONE;
888 spin_lock_irqsave(&floppy_lock, flags);
889 del_timer(&fd_timeout);
891 clear_bit(0, &fdc_busy);
892 if (current_req || blk_peek_request(floppy_queue))
893 do_fd_request(floppy_queue);
894 spin_unlock_irqrestore(&floppy_lock, flags);
898 /* switches the motor off after a given timeout */
899 static void motor_off_callback(unsigned long nr)
901 unsigned char mask = ~(0x10 << UNIT(nr));
903 set_dor(FDC(nr), mask, 0);
906 /* schedules motor off */
907 static void floppy_off(unsigned int drive)
909 unsigned long volatile delta;
910 int fdc = FDC(drive);
912 if (!(FDCS->dor & (0x10 << UNIT(drive))))
915 del_timer(motor_off_timer + drive);
917 /* make spindle stop in a position which minimizes spinup time
920 delta = jiffies - UDRS->first_read_date + HZ -
921 UDP->spindown_offset;
922 delta = ((delta * UDP->rps) % HZ) / UDP->rps;
923 motor_off_timer[drive].expires =
924 jiffies + UDP->spindown - delta;
926 add_timer(motor_off_timer + drive);
930 * cycle through all N_DRIVE floppy drives, for disk change testing.
931 * stopping at current drive. This is done before any long operation, to
932 * be sure to have up to date disk change information.
934 static void scandrives(void)
940 if (DP->select_delay)
943 saved_drive = current_drive;
944 for (i = 0; i < N_DRIVE; i++) {
945 drive = (saved_drive + i + 1) % N_DRIVE;
946 if (UDRS->fd_ref == 0 || UDP->select_delay != 0)
947 continue; /* skip closed drives */
949 if (!(set_dor(fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) &
950 (0x10 << UNIT(drive))))
951 /* switch the motor off again, if it was off to
953 set_dor(fdc, ~(0x10 << UNIT(drive)), 0);
955 set_fdc(saved_drive);
958 static void empty(void)
962 static DECLARE_WORK(floppy_work, NULL);
964 static void schedule_bh(void (*handler)(void))
966 PREPARE_WORK(&floppy_work, (work_func_t)handler);
967 schedule_work(&floppy_work);
970 static DEFINE_TIMER(fd_timer, NULL, 0, 0);
972 static void cancel_activity(void)
976 spin_lock_irqsave(&floppy_lock, flags);
978 PREPARE_WORK(&floppy_work, (work_func_t)empty);
979 del_timer(&fd_timer);
980 spin_unlock_irqrestore(&floppy_lock, flags);
983 /* this function makes sure that the disk stays in the drive during the
985 static void fd_watchdog(void)
987 debug_dcl(DP->flags, "calling disk change from watchdog\n");
989 if (disk_change(current_drive)) {
990 DPRINT("disk removed during i/o\n");
995 del_timer(&fd_timer);
996 fd_timer.function = (timeout_fn)fd_watchdog;
997 fd_timer.expires = jiffies + HZ / 10;
998 add_timer(&fd_timer);
1002 static void main_command_interrupt(void)
1004 del_timer(&fd_timer);
1008 /* waits for a delay (spinup or select) to pass */
1009 static int fd_wait_for_completion(unsigned long delay, timeout_fn function)
1012 reset_fdc(); /* do the reset during sleep to win time
1013 * if we don't need to sleep, it's a good
1014 * occasion anyways */
1018 if (time_before(jiffies, delay)) {
1019 del_timer(&fd_timer);
1020 fd_timer.function = function;
1021 fd_timer.expires = delay;
1022 add_timer(&fd_timer);
1028 static DEFINE_SPINLOCK(floppy_hlt_lock);
1029 static int hlt_disabled;
1030 static void floppy_disable_hlt(void)
1032 unsigned long flags;
1034 spin_lock_irqsave(&floppy_hlt_lock, flags);
1035 if (!hlt_disabled) {
1037 #ifdef HAVE_DISABLE_HLT
1041 spin_unlock_irqrestore(&floppy_hlt_lock, flags);
1044 static void floppy_enable_hlt(void)
1046 unsigned long flags;
1048 spin_lock_irqsave(&floppy_hlt_lock, flags);
1051 #ifdef HAVE_DISABLE_HLT
1055 spin_unlock_irqrestore(&floppy_hlt_lock, flags);
1058 static void setup_DMA(void)
1062 if (raw_cmd->length == 0) {
1065 pr_info("zero dma transfer size:");
1066 for (i = 0; i < raw_cmd->cmd_count; i++)
1067 pr_cont("%x,", raw_cmd->cmd[i]);
1073 if (((unsigned long)raw_cmd->kernel_data) % 512) {
1074 pr_info("non aligned address: %p\n", raw_cmd->kernel_data);
1079 f = claim_dma_lock();
1082 if (fd_dma_setup(raw_cmd->kernel_data, raw_cmd->length,
1083 (raw_cmd->flags & FD_RAW_READ) ?
1084 DMA_MODE_READ : DMA_MODE_WRITE, FDCS->address) < 0) {
1085 release_dma_lock(f);
1090 release_dma_lock(f);
1093 fd_cacheflush(raw_cmd->kernel_data, raw_cmd->length);
1094 fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ) ?
1095 DMA_MODE_READ : DMA_MODE_WRITE);
1096 fd_set_dma_addr(raw_cmd->kernel_data);
1097 fd_set_dma_count(raw_cmd->length);
1098 virtual_dma_port = FDCS->address;
1100 release_dma_lock(f);
1102 floppy_disable_hlt();
1105 static void show_floppy(void);
1107 /* waits until the fdc becomes ready */
1108 static int wait_til_ready(void)
1115 for (counter = 0; counter < 10000; counter++) {
1116 status = fd_inb(FD_STATUS);
1117 if (status & STATUS_READY)
1121 DPRINT("Getstatus times out (%x) on fdc %d\n", status, fdc);
1128 /* sends a command byte to the fdc */
1129 static int output_byte(char byte)
1131 int status = wait_til_ready();
1136 if (is_ready_state(status)) {
1137 fd_outb(byte, FD_DATA);
1138 output_log[output_log_pos].data = byte;
1139 output_log[output_log_pos].status = status;
1140 output_log[output_log_pos].jiffies = jiffies;
1141 output_log_pos = (output_log_pos + 1) % OLOGSIZE;
1146 DPRINT("Unable to send byte %x to FDC. Fdc=%x Status=%x\n",
1153 /* gets the response from the fdc */
1154 static int result(void)
1159 for (i = 0; i < MAX_REPLIES; i++) {
1160 status = wait_til_ready();
1163 status &= STATUS_DIR | STATUS_READY | STATUS_BUSY | STATUS_DMA;
1164 if ((status & ~STATUS_BUSY) == STATUS_READY) {
1165 resultjiffies = jiffies;
1169 if (status == (STATUS_DIR | STATUS_READY | STATUS_BUSY))
1170 reply_buffer[i] = fd_inb(FD_DATA);
1175 DPRINT("get result error. Fdc=%d Last status=%x Read bytes=%d\n",
1183 #define MORE_OUTPUT -2
1184 /* does the fdc need more output? */
1185 static int need_more_output(void)
1187 int status = wait_til_ready();
1192 if (is_ready_state(status))
1198 /* Set perpendicular mode as required, based on data rate, if supported.
1199 * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
1201 static void perpendicular_mode(void)
1203 unsigned char perp_mode;
1205 if (raw_cmd->rate & 0x40) {
1206 switch (raw_cmd->rate & 3) {
1214 DPRINT("Invalid data rate for perpendicular mode!\n");
1218 * convenient way to return to
1219 * redo without too much hassle
1220 * (deep stack et al.)
1227 if (FDCS->perp_mode == perp_mode)
1229 if (FDCS->version >= FDC_82077_ORIG) {
1230 output_byte(FD_PERPENDICULAR);
1231 output_byte(perp_mode);
1232 FDCS->perp_mode = perp_mode;
1233 } else if (perp_mode) {
1234 DPRINT("perpendicular mode not supported by this FDC.\n");
1236 } /* perpendicular_mode */
1238 static int fifo_depth = 0xa;
1241 static int fdc_configure(void)
1244 output_byte(FD_CONFIGURE);
1245 if (need_more_output() != MORE_OUTPUT)
1248 output_byte(0x10 | (no_fifo & 0x20) | (fifo_depth & 0xf));
1249 output_byte(0); /* pre-compensation from track
1254 #define NOMINAL_DTR 500
1256 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1257 * head load time, and DMA disable flag to values needed by floppy.
1259 * The value "dtr" is the data transfer rate in Kbps. It is needed
1260 * to account for the data rate-based scaling done by the 82072 and 82077
1261 * FDC types. This parameter is ignored for other types of FDCs (i.e.
1264 * Note that changing the data transfer rate has a (probably deleterious)
1265 * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1266 * fdc_specify is called again after each data transfer rate
1269 * srt: 1000 to 16000 in microseconds
1270 * hut: 16 to 240 milliseconds
1271 * hlt: 2 to 254 milliseconds
1273 * These values are rounded up to the next highest available delay time.
1275 static void fdc_specify(void)
1277 unsigned char spec1;
1278 unsigned char spec2;
1282 unsigned long dtr = NOMINAL_DTR;
1283 unsigned long scale_dtr = NOMINAL_DTR;
1284 int hlt_max_code = 0x7f;
1285 int hut_max_code = 0xf;
1287 if (FDCS->need_configure && FDCS->version >= FDC_82072A) {
1289 FDCS->need_configure = 0;
1292 switch (raw_cmd->rate & 0x03) {
1298 if (FDCS->version >= FDC_82078) {
1299 /* chose the default rate table, not the one
1300 * where 1 = 2 Mbps */
1301 output_byte(FD_DRIVESPEC);
1302 if (need_more_output() == MORE_OUTPUT) {
1303 output_byte(UNIT(current_drive));
1313 if (FDCS->version >= FDC_82072) {
1315 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1316 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1319 /* Convert step rate from microseconds to milliseconds and 4 bits */
1320 srt = 16 - DIV_ROUND_UP(DP->srt * scale_dtr / 1000, NOMINAL_DTR);
1327 hlt = DIV_ROUND_UP(DP->hlt * scale_dtr / 2, NOMINAL_DTR);
1330 else if (hlt > 0x7f)
1333 hut = DIV_ROUND_UP(DP->hut * scale_dtr / 16, NOMINAL_DTR);
1339 spec1 = (srt << 4) | hut;
1340 spec2 = (hlt << 1) | (use_virtual_dma & 1);
1342 /* If these parameters did not change, just return with success */
1343 if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1344 /* Go ahead and set spec1 and spec2 */
1345 output_byte(FD_SPECIFY);
1346 output_byte(FDCS->spec1 = spec1);
1347 output_byte(FDCS->spec2 = spec2);
1351 /* Set the FDC's data transfer rate on behalf of the specified drive.
1352 * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1353 * of the specify command (i.e. using the fdc_specify function).
1355 static int fdc_dtr(void)
1357 /* If data rate not already set to desired value, set it. */
1358 if ((raw_cmd->rate & 3) == FDCS->dtr)
1362 fd_outb(raw_cmd->rate & 3, FD_DCR);
1364 /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1365 * need a stabilization period of several milliseconds to be
1366 * enforced after data rate changes before R/W operations.
1367 * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1369 FDCS->dtr = raw_cmd->rate & 3;
1370 return fd_wait_for_completion(jiffies + 2UL * HZ / 100,
1371 (timeout_fn)floppy_ready);
1374 static void tell_sector(void)
1376 pr_cont(": track %d, head %d, sector %d, size %d",
1377 R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1380 static void print_errors(void)
1383 if (ST0 & ST0_ECE) {
1384 pr_cont("Recalibrate failed!");
1385 } else if (ST2 & ST2_CRC) {
1386 pr_cont("data CRC error");
1388 } else if (ST1 & ST1_CRC) {
1389 pr_cont("CRC error");
1391 } else if ((ST1 & (ST1_MAM | ST1_ND)) ||
1394 pr_cont("sector not found");
1397 pr_cont("probe failed...");
1398 } else if (ST2 & ST2_WC) { /* seek error */
1399 pr_cont("wrong cylinder");
1400 } else if (ST2 & ST2_BC) { /* cylinder marked as bad */
1401 pr_cont("bad cylinder");
1403 pr_cont("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x",
1411 * OK, this error interpreting routine is called after a
1412 * DMA read/write has succeeded
1413 * or failed, so we check the results, and copy any buffers.
1414 * hhb: Added better error reporting.
1415 * ak: Made this into a separate routine.
1417 static int interpret_errors(void)
1422 DPRINT("-- FDC reply error\n");
1427 /* check IC to find cause of interrupt */
1428 switch (ST0 & ST0_INTR) {
1429 case 0x40: /* error occurred during command execution */
1431 return 0; /* occurs with pseudo-DMA */
1434 DPRINT("Drive is write protected\n");
1435 clear_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1438 } else if (ST1 & ST1_ND) {
1439 set_bit(FD_NEED_TWADDLE_BIT, &DRS->flags);
1440 } else if (ST1 & ST1_OR) {
1441 if (DP->flags & FTD_MSG)
1442 DPRINT("Over/Underrun - retrying\n");
1444 } else if (*errors >= DP->max_errors.reporting) {
1447 if (ST2 & ST2_WC || ST2 & ST2_BC)
1448 /* wrong cylinder => recal */
1449 DRS->track = NEED_2_RECAL;
1451 case 0x80: /* invalid command given */
1452 DPRINT("Invalid FDC command given!\n");
1456 DPRINT("Abnormal termination caused by polling\n");
1459 default: /* (0) Normal command termination */
1465 * This routine is called when everything should be correctly set up
1466 * for the transfer (i.e. floppy motor is on, the correct floppy is
1467 * selected, and the head is sitting on the right track).
1469 static void setup_rw_floppy(void)
1475 unsigned long ready_date;
1476 timeout_fn function;
1478 flags = raw_cmd->flags;
1479 if (flags & (FD_RAW_READ | FD_RAW_WRITE))
1480 flags |= FD_RAW_INTR;
1482 if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)) {
1483 ready_date = DRS->spinup_date + DP->spinup;
1484 /* If spinup will take a long time, rerun scandrives
1485 * again just before spinup completion. Beware that
1486 * after scandrives, we must again wait for selection.
1488 if (time_after(ready_date, jiffies + DP->select_delay)) {
1489 ready_date -= DP->select_delay;
1490 function = (timeout_fn)floppy_start;
1492 function = (timeout_fn)setup_rw_floppy;
1494 /* wait until the floppy is spinning fast enough */
1495 if (fd_wait_for_completion(ready_date, function))
1498 dflags = DRS->flags;
1500 if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1503 if (flags & FD_RAW_INTR)
1504 do_floppy = main_command_interrupt;
1507 for (i = 0; i < raw_cmd->cmd_count; i++)
1508 r |= output_byte(raw_cmd->cmd[i]);
1510 debugt(__func__, "rw_command");
1518 if (!(flags & FD_RAW_INTR)) {
1521 } else if (flags & FD_RAW_NEED_DISK)
1525 static int blind_seek;
1528 * This is the routine called after every seek (or recalibrate) interrupt
1529 * from the floppy controller.
1531 static void seek_interrupt(void)
1533 debugt(__func__, "");
1534 if (inr != 2 || (ST0 & 0xF8) != 0x20) {
1535 DPRINT("seek failed\n");
1536 DRS->track = NEED_2_RECAL;
1541 if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek) {
1542 debug_dcl(DP->flags,
1543 "clearing NEWCHANGE flag because of effective seek\n");
1544 debug_dcl(DP->flags, "jiffies=%lu\n", jiffies);
1545 clear_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1546 /* effective seek */
1547 DRS->select_date = jiffies;
1553 static void check_wp(void)
1555 if (test_bit(FD_VERIFY_BIT, &DRS->flags)) {
1556 /* check write protection */
1557 output_byte(FD_GETSTATUS);
1558 output_byte(UNIT(current_drive));
1559 if (result() != 1) {
1563 clear_bit(FD_VERIFY_BIT, &DRS->flags);
1564 clear_bit(FD_NEED_TWADDLE_BIT, &DRS->flags);
1565 debug_dcl(DP->flags,
1566 "checking whether disk is write protected\n");
1567 debug_dcl(DP->flags, "wp=%x\n", ST3 & 0x40);
1569 set_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1571 clear_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1575 static void seek_floppy(void)
1581 debug_dcl(DP->flags, "calling disk change from %s\n", __func__);
1583 if (!test_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags) &&
1584 disk_change(current_drive) && (raw_cmd->flags & FD_RAW_NEED_DISK)) {
1585 /* the media changed flag should be cleared after the seek.
1586 * If it isn't, this means that there is really no disk in
1589 set_bit(FD_DISK_CHANGED_BIT, &DRS->flags);
1594 if (DRS->track <= NEED_1_RECAL) {
1595 recalibrate_floppy();
1597 } else if (test_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags) &&
1598 (raw_cmd->flags & FD_RAW_NEED_DISK) &&
1599 (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) {
1600 /* we seek to clear the media-changed condition. Does anybody
1601 * know a more elegant way, which works on all drives? */
1603 track = raw_cmd->track - 1;
1605 if (DP->flags & FD_SILENT_DCL_CLEAR) {
1606 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
1608 raw_cmd->flags |= FD_RAW_NEED_SEEK;
1614 if (raw_cmd->track != DRS->track &&
1615 (raw_cmd->flags & FD_RAW_NEED_SEEK))
1616 track = raw_cmd->track;
1623 do_floppy = seek_interrupt;
1624 output_byte(FD_SEEK);
1625 output_byte(UNIT(current_drive));
1626 if (output_byte(track) < 0) {
1630 debugt(__func__, "");
1633 static void recal_interrupt(void)
1635 debugt(__func__, "");
1638 else if (ST0 & ST0_ECE) {
1639 switch (DRS->track) {
1641 debugt(__func__, "need 1 recal");
1642 /* after a second recalibrate, we still haven't
1643 * reached track 0. Probably no drive. Raise an
1644 * error, as failing immediately might upset
1645 * computers possessed by the Devil :-) */
1650 debugt(__func__, "need 2 recal");
1651 /* If we already did a recalibrate,
1652 * and we are not at track 0, this
1653 * means we have moved. (The only way
1654 * not to move at recalibration is to
1655 * be already at track 0.) Clear the
1656 * new change flag */
1657 debug_dcl(DP->flags,
1658 "clearing NEWCHANGE flag because of second recalibrate\n");
1660 clear_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1661 DRS->select_date = jiffies;
1664 debugt(__func__, "default");
1665 /* Recalibrate moves the head by at
1666 * most 80 steps. If after one
1667 * recalibrate we don't have reached
1668 * track 0, this might mean that we
1669 * started beyond track 80. Try
1671 DRS->track = NEED_1_RECAL;
1679 static void print_result(char *message, int inr)
1683 DPRINT("%s ", message);
1685 for (i = 0; i < inr; i++)
1686 pr_cont("repl[%d]=%x ", i, reply_buffer[i]);
1690 /* interrupt handler. Note that this can be called externally on the Sparc */
1691 irqreturn_t floppy_interrupt(int irq, void *dev_id)
1695 void (*handler)(void) = do_floppy;
1697 lasthandler = handler;
1698 interruptjiffies = jiffies;
1700 f = claim_dma_lock();
1702 release_dma_lock(f);
1704 floppy_enable_hlt();
1706 if (fdc >= N_FDC || FDCS->address == -1) {
1707 /* we don't even know which FDC is the culprit */
1708 pr_info("DOR0=%x\n", fdc_state[0].dor);
1709 pr_info("floppy interrupt on bizarre fdc %d\n", fdc);
1710 pr_info("handler=%pf\n", handler);
1711 is_alive(__func__, "bizarre fdc");
1716 /* We have to clear the reset flag here, because apparently on boxes
1717 * with level triggered interrupts (PS/2, Sparc, ...), it is needed to
1718 * emit SENSEI's to clear the interrupt line. And FDCS->reset blocks the
1719 * emission of the SENSEI's.
1720 * It is OK to emit floppy commands because we are in an interrupt
1721 * handler here, and thus we have to fear no interference of other
1725 do_print = !handler && print_unex && initialized;
1729 print_result("unexpected interrupt", inr);
1733 output_byte(FD_SENSEI);
1736 print_result("sensei", inr);
1738 } while ((ST0 & 0x83) != UNIT(current_drive) &&
1739 inr == 2 && max_sensei);
1745 schedule_bh(handler);
1746 is_alive(__func__, "normal interrupt end");
1748 /* FIXME! Was it really for us? */
1752 static void recalibrate_floppy(void)
1754 debugt(__func__, "");
1755 do_floppy = recal_interrupt;
1756 output_byte(FD_RECALIBRATE);
1757 if (output_byte(UNIT(current_drive)) < 0)
1762 * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1764 static void reset_interrupt(void)
1766 debugt(__func__, "");
1767 result(); /* get the status ready for set_fdc */
1769 pr_info("reset set in interrupt, calling %pf\n", cont->error);
1770 cont->error(); /* a reset just after a reset. BAD! */
1776 * reset is done by pulling bit 2 of DOR low for a while (old FDCs),
1777 * or by setting the self clearing bit 7 of STATUS (newer FDCs)
1779 static void reset_fdc(void)
1781 unsigned long flags;
1783 do_floppy = reset_interrupt;
1787 /* Pseudo-DMA may intercept 'reset finished' interrupt. */
1788 /* Irrelevant for systems with true DMA (i386). */
1790 flags = claim_dma_lock();
1792 release_dma_lock(flags);
1794 if (FDCS->version >= FDC_82072A)
1795 fd_outb(0x80 | (FDCS->dtr & 3), FD_STATUS);
1797 fd_outb(FDCS->dor & ~0x04, FD_DOR);
1798 udelay(FD_RESET_DELAY);
1799 fd_outb(FDCS->dor, FD_DOR);
1803 static void show_floppy(void)
1808 pr_info("floppy driver state\n");
1809 pr_info("-------------------\n");
1810 pr_info("now=%lu last interrupt=%lu diff=%lu last called handler=%pf\n",
1811 jiffies, interruptjiffies, jiffies - interruptjiffies,
1814 pr_info("timeout_message=%s\n", timeout_message);
1815 pr_info("last output bytes:\n");
1816 for (i = 0; i < OLOGSIZE; i++)
1817 pr_info("%2x %2x %lu\n",
1818 output_log[(i + output_log_pos) % OLOGSIZE].data,
1819 output_log[(i + output_log_pos) % OLOGSIZE].status,
1820 output_log[(i + output_log_pos) % OLOGSIZE].jiffies);
1821 pr_info("last result at %lu\n", resultjiffies);
1822 pr_info("last redo_fd_request at %lu\n", lastredo);
1823 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1,
1824 reply_buffer, resultsize, true);
1826 pr_info("status=%x\n", fd_inb(FD_STATUS));
1827 pr_info("fdc_busy=%lu\n", fdc_busy);
1829 pr_info("do_floppy=%pf\n", do_floppy);
1830 if (work_pending(&floppy_work))
1831 pr_info("floppy_work.func=%pf\n", floppy_work.func);
1832 if (timer_pending(&fd_timer))
1833 pr_info("fd_timer.function=%pf\n", fd_timer.function);
1834 if (timer_pending(&fd_timeout)) {
1835 pr_info("timer_function=%pf\n", fd_timeout.function);
1836 pr_info("expires=%lu\n", fd_timeout.expires - jiffies);
1837 pr_info("now=%lu\n", jiffies);
1839 pr_info("cont=%p\n", cont);
1840 pr_info("current_req=%p\n", current_req);
1841 pr_info("command_status=%d\n", command_status);
1845 static void floppy_shutdown(unsigned long data)
1847 unsigned long flags;
1853 floppy_enable_hlt();
1855 flags = claim_dma_lock();
1857 release_dma_lock(flags);
1859 /* avoid dma going to a random drive after shutdown */
1862 DPRINT("floppy timeout called\n");
1866 cont->redo(); /* this will recall reset when needed */
1868 pr_info("no cont in shutdown!\n");
1869 process_fd_request();
1871 is_alive(__func__, "");
1874 /* start motor, check media-changed condition and write protection */
1875 static int start_motor(void (*function)(void))
1881 data = UNIT(current_drive);
1882 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)) {
1883 if (!(FDCS->dor & (0x10 << UNIT(current_drive)))) {
1885 /* no read since this drive is running */
1886 DRS->first_read_date = 0;
1887 /* note motor start time if motor is not yet running */
1888 DRS->spinup_date = jiffies;
1889 data |= (0x10 << UNIT(current_drive));
1891 } else if (FDCS->dor & (0x10 << UNIT(current_drive)))
1892 mask &= ~(0x10 << UNIT(current_drive));
1894 /* starts motor and selects floppy */
1895 del_timer(motor_off_timer + current_drive);
1896 set_dor(fdc, mask, data);
1898 /* wait_for_completion also schedules reset if needed. */
1899 return fd_wait_for_completion(DRS->select_date + DP->select_delay,
1900 (timeout_fn)function);
1903 static void floppy_ready(void)
1909 if (start_motor(floppy_ready))
1914 debug_dcl(DP->flags, "calling disk change from floppy_ready\n");
1915 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
1916 disk_change(current_drive) && !DP->select_delay)
1917 twaddle(); /* this clears the dcl on certain
1918 * drive/controller combinations */
1920 #ifdef fd_chose_dma_mode
1921 if ((raw_cmd->flags & FD_RAW_READ) || (raw_cmd->flags & FD_RAW_WRITE)) {
1922 unsigned long flags = claim_dma_lock();
1923 fd_chose_dma_mode(raw_cmd->kernel_data, raw_cmd->length);
1924 release_dma_lock(flags);
1928 if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)) {
1929 perpendicular_mode();
1930 fdc_specify(); /* must be done here because of hut, hlt ... */
1933 if ((raw_cmd->flags & FD_RAW_READ) ||
1934 (raw_cmd->flags & FD_RAW_WRITE))
1940 static void floppy_start(void)
1942 reschedule_timeout(current_reqD, "floppy start");
1945 debug_dcl(DP->flags, "setting NEWCHANGE in floppy_start\n");
1946 set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1951 * ========================================================================
1952 * here ends the bottom half. Exported routines are:
1953 * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1954 * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1955 * Initialization also uses output_byte, result, set_dor, floppy_interrupt
1957 * ========================================================================
1960 * General purpose continuations.
1961 * ==============================
1964 static void do_wakeup(void)
1966 reschedule_timeout(MAXTIMEOUT, "do wakeup");
1968 command_status += 2;
1969 wake_up(&command_done);
1972 static struct cont_t wakeup_cont = {
1976 .done = (done_f)empty
1979 static struct cont_t intr_cont = {
1981 .redo = process_fd_request,
1983 .done = (done_f)empty
1986 static int wait_til_done(void (*handler)(void), bool interruptible)
1990 schedule_bh(handler);
1993 wait_event_interruptible(command_done, command_status >= 2);
1995 wait_event(command_done, command_status >= 2);
1997 if (command_status < 2) {
2005 command_status = FD_COMMAND_ERROR;
2006 if (command_status == FD_COMMAND_OKAY)
2010 command_status = FD_COMMAND_NONE;
2014 static void generic_done(int result)
2016 command_status = result;
2017 cont = &wakeup_cont;
2020 static void generic_success(void)
2025 static void generic_failure(void)
2030 static void success_and_wakeup(void)
2037 * formatting and rw support.
2038 * ==========================
2041 static int next_valid_format(void)
2045 probed_format = DRS->probed_format;
2047 if (probed_format >= 8 || !DP->autodetect[probed_format]) {
2048 DRS->probed_format = 0;
2051 if (floppy_type[DP->autodetect[probed_format]].sect) {
2052 DRS->probed_format = probed_format;
2059 static void bad_flp_intr(void)
2064 DRS->probed_format++;
2065 if (!next_valid_format())
2068 err_count = ++(*errors);
2069 INFBOUND(DRWE->badness, err_count);
2070 if (err_count > DP->max_errors.abort)
2072 if (err_count > DP->max_errors.reset)
2074 else if (err_count > DP->max_errors.recal)
2075 DRS->track = NEED_2_RECAL;
2078 static void set_floppy(int drive)
2080 int type = ITYPE(UDRS->fd_device);
2083 _floppy = floppy_type + type;
2085 _floppy = current_type[drive];
2089 * formatting support.
2090 * ===================
2092 static void format_interrupt(void)
2094 switch (interpret_errors()) {
2105 #define FM_MODE(x, y) ((y) & ~(((x)->rate & 0x80) >> 1))
2106 #define CT(x) ((x) | 0xc0)
2108 static void setup_format_params(int track)
2116 unsigned char track, head, sect, size;
2117 } *here = (struct fparm *)floppy_track_buffer;
2119 raw_cmd = &default_raw_cmd;
2120 raw_cmd->track = track;
2122 raw_cmd->flags = (FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
2123 FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK);
2124 raw_cmd->rate = _floppy->rate & 0x43;
2125 raw_cmd->cmd_count = NR_F;
2126 COMMAND = FM_MODE(_floppy, FD_FORMAT);
2127 DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, format_req.head);
2128 F_SIZECODE = FD_SIZECODE(_floppy);
2129 F_SECT_PER_TRACK = _floppy->sect << 2 >> F_SIZECODE;
2130 F_GAP = _floppy->fmt_gap;
2131 F_FILL = FD_FILL_BYTE;
2133 raw_cmd->kernel_data = floppy_track_buffer;
2134 raw_cmd->length = 4 * F_SECT_PER_TRACK;
2136 /* allow for about 30ms for data transport per track */
2137 head_shift = (F_SECT_PER_TRACK + 5) / 6;
2139 /* a ``cylinder'' is two tracks plus a little stepping time */
2140 track_shift = 2 * head_shift + 3;
2142 /* position of logical sector 1 on this track */
2143 n = (track_shift * format_req.track + head_shift * format_req.head)
2146 /* determine interleave */
2148 if (_floppy->fmt_gap < 0x22)
2151 /* initialize field */
2152 for (count = 0; count < F_SECT_PER_TRACK; ++count) {
2153 here[count].track = format_req.track;
2154 here[count].head = format_req.head;
2155 here[count].sect = 0;
2156 here[count].size = F_SIZECODE;
2158 /* place logical sectors */
2159 for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
2160 here[n].sect = count;
2161 n = (n + il) % F_SECT_PER_TRACK;
2162 if (here[n].sect) { /* sector busy, find next free sector */
2164 if (n >= F_SECT_PER_TRACK) {
2165 n -= F_SECT_PER_TRACK;
2166 while (here[n].sect)
2171 if (_floppy->stretch & FD_SECTBASEMASK) {
2172 for (count = 0; count < F_SECT_PER_TRACK; count++)
2173 here[count].sect += FD_SECTBASE(_floppy) - 1;
2177 static void redo_format(void)
2180 setup_format_params(format_req.track << STRETCH(_floppy));
2182 debugt(__func__, "queue format request");
2185 static struct cont_t format_cont = {
2186 .interrupt = format_interrupt,
2187 .redo = redo_format,
2188 .error = bad_flp_intr,
2189 .done = generic_done
2192 static int do_format(int drive, struct format_descr *tmp_format_req)
2196 if (lock_fdc(drive, true))
2201 _floppy->track > DP->tracks ||
2202 tmp_format_req->track >= _floppy->track ||
2203 tmp_format_req->head >= _floppy->head ||
2204 (_floppy->sect << 2) % (1 << FD_SIZECODE(_floppy)) ||
2205 !_floppy->fmt_gap) {
2206 process_fd_request();
2209 format_req = *tmp_format_req;
2211 cont = &format_cont;
2212 errors = &format_errors;
2213 ret = wait_til_done(redo_format, true);
2216 process_fd_request();
2221 * Buffer read/write and support
2222 * =============================
2225 static void floppy_end_request(struct request *req, int error)
2227 unsigned int nr_sectors = current_count_sectors;
2228 unsigned int drive = (unsigned long)req->rq_disk->private_data;
2230 /* current_count_sectors can be zero if transfer failed */
2232 nr_sectors = blk_rq_cur_sectors(req);
2233 if (__blk_end_request(req, error, nr_sectors << 9))
2236 /* We're done with the request */
2241 /* new request_done. Can handle physical sectors which are smaller than a
2243 static void request_done(int uptodate)
2245 struct request_queue *q = floppy_queue;
2246 struct request *req = current_req;
2247 unsigned long flags;
2249 char msg[sizeof("request done ") + sizeof(int) * 3];
2252 snprintf(msg, sizeof(msg), "request done %d", uptodate);
2253 reschedule_timeout(MAXTIMEOUT, msg);
2256 pr_info("floppy.c: no request in request_done\n");
2261 /* maintain values for invalidation on geometry
2263 block = current_count_sectors + blk_rq_pos(req);
2264 INFBOUND(DRS->maxblock, block);
2265 if (block > _floppy->sect)
2268 /* unlock chained buffers */
2269 spin_lock_irqsave(q->queue_lock, flags);
2270 floppy_end_request(req, 0);
2271 spin_unlock_irqrestore(q->queue_lock, flags);
2273 if (rq_data_dir(req) == WRITE) {
2274 /* record write error information */
2275 DRWE->write_errors++;
2276 if (DRWE->write_errors == 1) {
2277 DRWE->first_error_sector = blk_rq_pos(req);
2278 DRWE->first_error_generation = DRS->generation;
2280 DRWE->last_error_sector = blk_rq_pos(req);
2281 DRWE->last_error_generation = DRS->generation;
2283 spin_lock_irqsave(q->queue_lock, flags);
2284 floppy_end_request(req, -EIO);
2285 spin_unlock_irqrestore(q->queue_lock, flags);
2289 /* Interrupt handler evaluating the result of the r/w operation */
2290 static void rw_interrupt(void)
2298 /* some Toshiba floppy controllers occasionnally seem to
2299 * return bogus interrupts after read/write operations, which
2300 * can be recognized by a bad head number (>= 2) */
2304 if (!DRS->first_read_date)
2305 DRS->first_read_date = jiffies;
2308 ssize = DIV_ROUND_UP(1 << SIZECODE, 4);
2320 nr_sectors = (((R_TRACK - TRACK) * heads +
2321 R_HEAD - HEAD) * SECT_PER_TRACK +
2322 R_SECTOR - SECTOR + eoc) << SIZECODE >> 2;
2324 if (nr_sectors / ssize >
2325 DIV_ROUND_UP(in_sector_offset + current_count_sectors, ssize)) {
2326 DPRINT("long rw: %x instead of %lx\n",
2327 nr_sectors, current_count_sectors);
2328 pr_info("rs=%d s=%d\n", R_SECTOR, SECTOR);
2329 pr_info("rh=%d h=%d\n", R_HEAD, HEAD);
2330 pr_info("rt=%d t=%d\n", R_TRACK, TRACK);
2331 pr_info("heads=%d eoc=%d\n", heads, eoc);
2332 pr_info("spt=%d st=%d ss=%d\n",
2333 SECT_PER_TRACK, fsector_t, ssize);
2334 pr_info("in_sector_offset=%d\n", in_sector_offset);
2337 nr_sectors -= in_sector_offset;
2338 INFBOUND(nr_sectors, 0);
2339 SUPBOUND(current_count_sectors, nr_sectors);
2341 switch (interpret_errors()) {
2346 if (!current_count_sectors) {
2353 if (!current_count_sectors) {
2357 current_type[current_drive] = _floppy;
2358 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2363 if (DP->flags & FTD_MSG)
2364 DPRINT("Auto-detected floppy type %s in fd%d\n",
2365 _floppy->name, current_drive);
2366 current_type[current_drive] = _floppy;
2367 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2371 if (CT(COMMAND) != FD_READ ||
2372 raw_cmd->kernel_data == current_req->buffer) {
2373 /* transfer directly from buffer */
2375 } else if (CT(COMMAND) == FD_READ) {
2376 buffer_track = raw_cmd->track;
2377 buffer_drive = current_drive;
2378 INFBOUND(buffer_max, nr_sectors + fsector_t);
2383 /* Compute maximal contiguous buffer size. */
2384 static int buffer_chain_size(void)
2388 struct req_iterator iter;
2391 base = bio_data(current_req->bio);
2394 rq_for_each_segment(bv, current_req, iter) {
2395 if (page_address(bv->bv_page) + bv->bv_offset != base + size)
2404 /* Compute the maximal transfer size */
2405 static int transfer_size(int ssize, int max_sector, int max_size)
2407 SUPBOUND(max_sector, fsector_t + max_size);
2410 max_sector -= (max_sector % _floppy->sect) % ssize;
2412 /* transfer size, beginning not aligned */
2413 current_count_sectors = max_sector - fsector_t;
2419 * Move data from/to the track buffer to/from the buffer cache.
2421 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
2423 int remaining; /* number of transferred 512-byte sectors */
2428 struct req_iterator iter;
2430 max_sector = transfer_size(ssize,
2431 min(max_sector, max_sector_2),
2432 blk_rq_sectors(current_req));
2434 if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2435 buffer_max > fsector_t + blk_rq_sectors(current_req))
2436 current_count_sectors = min_t(int, buffer_max - fsector_t,
2437 blk_rq_sectors(current_req));
2439 remaining = current_count_sectors << 9;
2440 if (remaining > blk_rq_bytes(current_req) && CT(COMMAND) == FD_WRITE) {
2441 DPRINT("in copy buffer\n");
2442 pr_info("current_count_sectors=%ld\n", current_count_sectors);
2443 pr_info("remaining=%d\n", remaining >> 9);
2444 pr_info("current_req->nr_sectors=%u\n",
2445 blk_rq_sectors(current_req));
2446 pr_info("current_req->current_nr_sectors=%u\n",
2447 blk_rq_cur_sectors(current_req));
2448 pr_info("max_sector=%d\n", max_sector);
2449 pr_info("ssize=%d\n", ssize);
2452 buffer_max = max(max_sector, buffer_max);
2454 dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9);
2456 size = blk_rq_cur_bytes(current_req);
2458 rq_for_each_segment(bv, current_req, iter) {
2463 SUPBOUND(size, remaining);
2465 buffer = page_address(bv->bv_page) + bv->bv_offset;
2466 if (dma_buffer + size >
2467 floppy_track_buffer + (max_buffer_sectors << 10) ||
2468 dma_buffer < floppy_track_buffer) {
2469 DPRINT("buffer overrun in copy buffer %d\n",
2470 (int)((floppy_track_buffer - dma_buffer) >> 9));
2471 pr_info("fsector_t=%d buffer_min=%d\n",
2472 fsector_t, buffer_min);
2473 pr_info("current_count_sectors=%ld\n",
2474 current_count_sectors);
2475 if (CT(COMMAND) == FD_READ)
2477 if (CT(COMMAND) == FD_WRITE)
2481 if (((unsigned long)buffer) % 512)
2482 DPRINT("%p buffer not aligned\n", buffer);
2484 if (CT(COMMAND) == FD_READ)
2485 memcpy(buffer, dma_buffer, size);
2487 memcpy(dma_buffer, buffer, size);
2494 max_sector -= remaining >> 9;
2495 DPRINT("weirdness: remaining %d\n", remaining >> 9);
2499 /* work around a bug in pseudo DMA
2500 * (on some FDCs) pseudo DMA does not stop when the CPU stops
2501 * sending data. Hence we need a different way to signal the
2502 * transfer length: We use SECT_PER_TRACK. Unfortunately, this
2503 * does not work with MT, hence we can only transfer one head at
2506 static void virtualdmabug_workaround(void)
2511 if (CT(COMMAND) == FD_WRITE) {
2512 COMMAND &= ~0x80; /* switch off multiple track mode */
2514 hard_sectors = raw_cmd->length >> (7 + SIZECODE);
2515 end_sector = SECTOR + hard_sectors - 1;
2516 if (end_sector > SECT_PER_TRACK) {
2517 pr_info("too many sectors %d > %d\n",
2518 end_sector, SECT_PER_TRACK);
2521 SECT_PER_TRACK = end_sector;
2522 /* make sure SECT_PER_TRACK
2523 * points to end of transfer */
2528 * Formulate a read/write request.
2529 * this routine decides where to load the data (directly to buffer, or to
2530 * tmp floppy area), how much data to load (the size of the buffer, the whole
2531 * track, or a single sector)
2532 * All floppy_track_buffer handling goes in here. If we ever add track buffer
2533 * allocation on the fly, it should be done here. No other part should need
2537 static int make_raw_rw_request(void)
2539 int aligned_sector_t;
2545 if (WARN(max_buffer_sectors == 0, "VFS: Block I/O scheduled on unopened device\n"))
2548 set_fdc((long)current_req->rq_disk->private_data);
2550 raw_cmd = &default_raw_cmd;
2551 raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
2553 raw_cmd->cmd_count = NR_RW;
2554 if (rq_data_dir(current_req) == READ) {
2555 raw_cmd->flags |= FD_RAW_READ;
2556 COMMAND = FM_MODE(_floppy, FD_READ);
2557 } else if (rq_data_dir(current_req) == WRITE) {
2558 raw_cmd->flags |= FD_RAW_WRITE;
2559 COMMAND = FM_MODE(_floppy, FD_WRITE);
2561 DPRINT("%s: unknown command\n", __func__);
2565 max_sector = _floppy->sect * _floppy->head;
2567 TRACK = (int)blk_rq_pos(current_req) / max_sector;
2568 fsector_t = (int)blk_rq_pos(current_req) % max_sector;
2569 if (_floppy->track && TRACK >= _floppy->track) {
2570 if (blk_rq_cur_sectors(current_req) & 1) {
2571 current_count_sectors = 1;
2576 HEAD = fsector_t / _floppy->sect;
2578 if (((_floppy->stretch & (FD_SWAPSIDES | FD_SECTBASEMASK)) ||
2579 test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags)) &&
2580 fsector_t < _floppy->sect)
2581 max_sector = _floppy->sect;
2583 /* 2M disks have phantom sectors on the first track */
2584 if ((_floppy->rate & FD_2M) && (!TRACK) && (!HEAD)) {
2585 max_sector = 2 * _floppy->sect / 3;
2586 if (fsector_t >= max_sector) {
2587 current_count_sectors =
2588 min_t(int, _floppy->sect - fsector_t,
2589 blk_rq_sectors(current_req));
2594 SIZECODE = FD_SIZECODE(_floppy);
2595 raw_cmd->rate = _floppy->rate & 0x43;
2596 if ((_floppy->rate & FD_2M) && (TRACK || HEAD) && raw_cmd->rate == 2)
2603 raw_cmd->track = TRACK << STRETCH(_floppy);
2604 DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, HEAD);
2606 ssize = DIV_ROUND_UP(1 << SIZECODE, 4);
2607 SECT_PER_TRACK = _floppy->sect << 2 >> SIZECODE;
2608 SECTOR = ((fsector_t % _floppy->sect) << 2 >> SIZECODE) +
2609 FD_SECTBASE(_floppy);
2611 /* tracksize describes the size which can be filled up with sectors
2614 tracksize = _floppy->sect - _floppy->sect % ssize;
2615 if (tracksize < _floppy->sect) {
2617 if (tracksize <= fsector_t % _floppy->sect)
2620 /* if we are beyond tracksize, fill up using smaller sectors */
2621 while (tracksize <= fsector_t % _floppy->sect) {
2622 while (tracksize + ssize > _floppy->sect) {
2630 max_sector = HEAD * _floppy->sect + tracksize;
2631 } else if (!TRACK && !HEAD && !(_floppy->rate & FD_2M) && probing) {
2632 max_sector = _floppy->sect;
2633 } else if (!HEAD && CT(COMMAND) == FD_WRITE) {
2634 /* for virtual DMA bug workaround */
2635 max_sector = _floppy->sect;
2638 in_sector_offset = (fsector_t % _floppy->sect) % ssize;
2639 aligned_sector_t = fsector_t - in_sector_offset;
2640 max_size = blk_rq_sectors(current_req);
2641 if ((raw_cmd->track == buffer_track) &&
2642 (current_drive == buffer_drive) &&
2643 (fsector_t >= buffer_min) && (fsector_t < buffer_max)) {
2644 /* data already in track buffer */
2645 if (CT(COMMAND) == FD_READ) {
2646 copy_buffer(1, max_sector, buffer_max);
2649 } else if (in_sector_offset || blk_rq_sectors(current_req) < ssize) {
2650 if (CT(COMMAND) == FD_WRITE) {
2651 unsigned int sectors;
2653 sectors = fsector_t + blk_rq_sectors(current_req);
2654 if (sectors > ssize && sectors < ssize + ssize)
2655 max_size = ssize + ssize;
2659 raw_cmd->flags &= ~FD_RAW_WRITE;
2660 raw_cmd->flags |= FD_RAW_READ;
2661 COMMAND = FM_MODE(_floppy, FD_READ);
2662 } else if ((unsigned long)current_req->buffer < MAX_DMA_ADDRESS) {
2663 unsigned long dma_limit;
2664 int direct, indirect;
2667 transfer_size(ssize, max_sector,
2668 max_buffer_sectors * 2) - fsector_t;
2671 * Do NOT use minimum() here---MAX_DMA_ADDRESS is 64 bits wide
2672 * on a 64 bit machine!
2674 max_size = buffer_chain_size();
2675 dma_limit = (MAX_DMA_ADDRESS -
2676 ((unsigned long)current_req->buffer)) >> 9;
2677 if ((unsigned long)max_size > dma_limit)
2678 max_size = dma_limit;
2679 /* 64 kb boundaries */
2680 if (CROSS_64KB(current_req->buffer, max_size << 9))
2682 ((unsigned long)current_req->buffer) %
2684 direct = transfer_size(ssize, max_sector, max_size) - fsector_t;
2686 * We try to read tracks, but if we get too many errors, we
2687 * go back to reading just one sector at a time.
2689 * This means we should be able to read a sector even if there
2690 * are other bad sectors on this track.
2693 (indirect * 2 > direct * 3 &&
2694 *errors < DP->max_errors.read_track &&
2696 (DP->read_track & (1 << DRS->probed_format)))))) {
2697 max_size = blk_rq_sectors(current_req);
2699 raw_cmd->kernel_data = current_req->buffer;
2700 raw_cmd->length = current_count_sectors << 9;
2701 if (raw_cmd->length == 0) {
2702 DPRINT("%s: zero dma transfer attempted\n", __func__);
2703 DPRINT("indirect=%d direct=%d fsector_t=%d\n",
2704 indirect, direct, fsector_t);
2707 virtualdmabug_workaround();
2712 if (CT(COMMAND) == FD_READ)
2713 max_size = max_sector; /* unbounded */
2715 /* claim buffer track if needed */
2716 if (buffer_track != raw_cmd->track || /* bad track */
2717 buffer_drive != current_drive || /* bad drive */
2718 fsector_t > buffer_max ||
2719 fsector_t < buffer_min ||
2720 ((CT(COMMAND) == FD_READ ||
2721 (!in_sector_offset && blk_rq_sectors(current_req) >= ssize)) &&
2722 max_sector > 2 * max_buffer_sectors + buffer_min &&
2723 max_size + fsector_t > 2 * max_buffer_sectors + buffer_min)) {
2724 /* not enough space */
2726 buffer_drive = current_drive;
2727 buffer_max = buffer_min = aligned_sector_t;
2729 raw_cmd->kernel_data = floppy_track_buffer +
2730 ((aligned_sector_t - buffer_min) << 9);
2732 if (CT(COMMAND) == FD_WRITE) {
2733 /* copy write buffer to track buffer.
2734 * if we get here, we know that the write
2735 * is either aligned or the data already in the buffer
2736 * (buffer will be overwritten) */
2737 if (in_sector_offset && buffer_track == -1)
2738 DPRINT("internal error offset !=0 on write\n");
2739 buffer_track = raw_cmd->track;
2740 buffer_drive = current_drive;
2741 copy_buffer(ssize, max_sector,
2742 2 * max_buffer_sectors + buffer_min);
2744 transfer_size(ssize, max_sector,
2745 2 * max_buffer_sectors + buffer_min -
2748 /* round up current_count_sectors to get dma xfer size */
2749 raw_cmd->length = in_sector_offset + current_count_sectors;
2750 raw_cmd->length = ((raw_cmd->length - 1) | (ssize - 1)) + 1;
2751 raw_cmd->length <<= 9;
2752 if ((raw_cmd->length < current_count_sectors << 9) ||
2753 (raw_cmd->kernel_data != current_req->buffer &&
2754 CT(COMMAND) == FD_WRITE &&
2755 (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
2756 aligned_sector_t < buffer_min)) ||
2757 raw_cmd->length % (128 << SIZECODE) ||
2758 raw_cmd->length <= 0 || current_count_sectors <= 0) {
2759 DPRINT("fractionary current count b=%lx s=%lx\n",
2760 raw_cmd->length, current_count_sectors);
2761 if (raw_cmd->kernel_data != current_req->buffer)
2762 pr_info("addr=%d, length=%ld\n",
2763 (int)((raw_cmd->kernel_data -
2764 floppy_track_buffer) >> 9),
2765 current_count_sectors);
2766 pr_info("st=%d ast=%d mse=%d msi=%d\n",
2767 fsector_t, aligned_sector_t, max_sector, max_size);
2768 pr_info("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2769 pr_info("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2770 COMMAND, SECTOR, HEAD, TRACK);
2771 pr_info("buffer drive=%d\n", buffer_drive);
2772 pr_info("buffer track=%d\n", buffer_track);
2773 pr_info("buffer_min=%d\n", buffer_min);
2774 pr_info("buffer_max=%d\n", buffer_max);
2778 if (raw_cmd->kernel_data != current_req->buffer) {
2779 if (raw_cmd->kernel_data < floppy_track_buffer ||
2780 current_count_sectors < 0 ||
2781 raw_cmd->length < 0 ||
2782 raw_cmd->kernel_data + raw_cmd->length >
2783 floppy_track_buffer + (max_buffer_sectors << 10)) {
2784 DPRINT("buffer overrun in schedule dma\n");
2785 pr_info("fsector_t=%d buffer_min=%d current_count=%ld\n",
2786 fsector_t, buffer_min, raw_cmd->length >> 9);
2787 pr_info("current_count_sectors=%ld\n",
2788 current_count_sectors);
2789 if (CT(COMMAND) == FD_READ)
2791 if (CT(COMMAND) == FD_WRITE)
2795 } else if (raw_cmd->length > blk_rq_bytes(current_req) ||
2796 current_count_sectors > blk_rq_sectors(current_req)) {
2797 DPRINT("buffer overrun in direct transfer\n");
2799 } else if (raw_cmd->length < current_count_sectors << 9) {
2800 DPRINT("more sectors than bytes\n");
2801 pr_info("bytes=%ld\n", raw_cmd->length >> 9);
2802 pr_info("sectors=%ld\n", current_count_sectors);
2804 if (raw_cmd->length == 0) {
2805 DPRINT("zero dma transfer attempted from make_raw_request\n");
2809 virtualdmabug_workaround();
2813 static void redo_fd_request(void)
2819 if (current_drive < N_DRIVE)
2820 floppy_off(current_drive);
2824 struct request *req;
2826 spin_lock_irq(floppy_queue->queue_lock);
2827 req = blk_fetch_request(floppy_queue);
2828 spin_unlock_irq(floppy_queue->queue_lock);
2836 drive = (long)current_req->rq_disk->private_data;
2838 reschedule_timeout(current_reqD, "redo fd request");
2841 raw_cmd = &default_raw_cmd;
2843 if (start_motor(redo_fd_request))
2846 disk_change(current_drive);
2847 if (test_bit(current_drive, &fake_change) ||
2848 test_bit(FD_DISK_CHANGED_BIT, &DRS->flags)) {
2849 DPRINT("disk absent or changed during operation\n");
2853 if (!_floppy) { /* Autodetection */
2855 DRS->probed_format = 0;
2856 if (next_valid_format()) {
2857 DPRINT("no autodetectable formats\n");
2864 _floppy = floppy_type + DP->autodetect[DRS->probed_format];
2867 errors = &(current_req->errors);
2868 tmp = make_raw_rw_request();
2874 if (test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags))
2876 schedule_bh(floppy_start);
2877 debugt(__func__, "queue fd request");
2881 static struct cont_t rw_cont = {
2882 .interrupt = rw_interrupt,
2883 .redo = redo_fd_request,
2884 .error = bad_flp_intr,
2885 .done = request_done
2888 static void process_fd_request(void)
2891 schedule_bh(redo_fd_request);
2894 static void do_fd_request(struct request_queue *q)
2896 if (WARN(max_buffer_sectors == 0,
2897 "VFS: %s called on non-open device\n", __func__))
2900 if (WARN(atomic_read(&usage_count) == 0,
2901 "warning: usage count=0, current_req=%p sect=%ld type=%x flags=%x\n",
2902 current_req, (long)blk_rq_pos(current_req), current_req->cmd_type,
2903 current_req->cmd_flags))
2906 if (test_bit(0, &fdc_busy)) {
2907 /* fdc busy, this new request will be treated when the
2908 current one is done */
2909 is_alive(__func__, "old request running");
2912 lock_fdc(MAXTIMEOUT, false);
2913 process_fd_request();
2914 is_alive(__func__, "");
2917 static struct cont_t poll_cont = {
2918 .interrupt = success_and_wakeup,
2919 .redo = floppy_ready,
2920 .error = generic_failure,
2921 .done = generic_done
2924 static int poll_drive(bool interruptible, int flag)
2926 /* no auto-sense, just clear dcl */
2927 raw_cmd = &default_raw_cmd;
2928 raw_cmd->flags = flag;
2930 raw_cmd->cmd_count = 0;
2932 debug_dcl(DP->flags, "setting NEWCHANGE in poll_drive\n");
2933 set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
2935 return wait_til_done(floppy_ready, interruptible);
2939 * User triggered reset
2940 * ====================
2943 static void reset_intr(void)
2945 pr_info("weird, reset interrupt called\n");
2948 static struct cont_t reset_cont = {
2949 .interrupt = reset_intr,
2950 .redo = success_and_wakeup,
2951 .error = generic_failure,
2952 .done = generic_done
2955 static int user_reset_fdc(int drive, int arg, bool interruptible)
2959 if (lock_fdc(drive, interruptible))
2962 if (arg == FD_RESET_ALWAYS)
2966 ret = wait_til_done(reset_fdc, interruptible);
2970 process_fd_request();
2975 * Misc Ioctl's and support
2976 * ========================
2978 static inline int fd_copyout(void __user *param, const void *address,
2981 return copy_to_user(param, address, size) ? -EFAULT : 0;
2984 static inline int fd_copyin(void __user *param, void *address,
2987 return copy_from_user(address, param, size) ? -EFAULT : 0;
2990 static const char *drive_name(int type, int drive)
2992 struct floppy_struct *floppy;
2995 floppy = floppy_type + type;
2997 if (UDP->native_format)
2998 floppy = floppy_type + UDP->native_format;
3003 return floppy->name;
3009 static void raw_cmd_done(int flag)
3014 raw_cmd->flags |= FD_RAW_FAILURE;
3015 raw_cmd->flags |= FD_RAW_HARDFAILURE;
3017 raw_cmd->reply_count = inr;
3018 if (raw_cmd->reply_count > MAX_REPLIES)
3019 raw_cmd->reply_count = 0;
3020 for (i = 0; i < raw_cmd->reply_count; i++)
3021 raw_cmd->reply[i] = reply_buffer[i];
3023 if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3024 unsigned long flags;
3025 flags = claim_dma_lock();
3026 raw_cmd->length = fd_get_dma_residue();
3027 release_dma_lock(flags);
3030 if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
3031 (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
3032 raw_cmd->flags |= FD_RAW_FAILURE;
3034 if (disk_change(current_drive))
3035 raw_cmd->flags |= FD_RAW_DISK_CHANGE;
3037 raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
3038 if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
3039 motor_off_callback(current_drive);
3041 if (raw_cmd->next &&
3042 (!(raw_cmd->flags & FD_RAW_FAILURE) ||
3043 !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
3044 ((raw_cmd->flags & FD_RAW_FAILURE) ||
3045 !(raw_cmd->flags & FD_RAW_STOP_IF_SUCCESS))) {
3046 raw_cmd = raw_cmd->next;
3053 static struct cont_t raw_cmd_cont = {
3054 .interrupt = success_and_wakeup,
3055 .redo = floppy_start,
3056 .error = generic_failure,
3057 .done = raw_cmd_done
3060 static int raw_cmd_copyout(int cmd, void __user *param,
3061 struct floppy_raw_cmd *ptr)
3066 ret = copy_to_user(param, ptr, sizeof(*ptr));
3069 param += sizeof(struct floppy_raw_cmd);
3070 if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) {
3071 if (ptr->length >= 0 &&
3072 ptr->length <= ptr->buffer_length) {
3073 long length = ptr->buffer_length - ptr->length;
3074 ret = fd_copyout(ptr->data, ptr->kernel_data,
3086 static void raw_cmd_free(struct floppy_raw_cmd **ptr)
3088 struct floppy_raw_cmd *next;
3089 struct floppy_raw_cmd *this;
3094 if (this->buffer_length) {
3095 fd_dma_mem_free((unsigned long)this->kernel_data,
3096 this->buffer_length);
3097 this->buffer_length = 0;
3105 static int raw_cmd_copyin(int cmd, void __user *param,
3106 struct floppy_raw_cmd **rcmd)
3108 struct floppy_raw_cmd *ptr;
3115 ptr = kmalloc(sizeof(struct floppy_raw_cmd), GFP_USER);
3119 ret = copy_from_user(ptr, param, sizeof(*ptr));
3123 ptr->buffer_length = 0;
3124 param += sizeof(struct floppy_raw_cmd);
3125 if (ptr->cmd_count > 33)
3126 /* the command may now also take up the space
3127 * initially intended for the reply & the
3128 * reply count. Needed for long 82078 commands
3129 * such as RESTORE, which takes ... 17 command
3130 * bytes. Murphy's law #137: When you reserve
3131 * 16 bytes for a structure, you'll one day
3132 * discover that you really need 17...
3136 for (i = 0; i < 16; i++)
3138 ptr->resultcode = 0;
3139 ptr->kernel_data = NULL;
3141 if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3142 if (ptr->length <= 0)
3144 ptr->kernel_data = (char *)fd_dma_mem_alloc(ptr->length);
3145 fallback_on_nodma_alloc(&ptr->kernel_data, ptr->length);
3146 if (!ptr->kernel_data)
3148 ptr->buffer_length = ptr->length;
3150 if (ptr->flags & FD_RAW_WRITE) {
3151 ret = fd_copyin(ptr->data, ptr->kernel_data, ptr->length);
3156 if (ptr->flags & FD_RAW_MORE) {
3157 rcmd = &(ptr->next);
3165 static int raw_cmd_ioctl(int cmd, void __user *param)
3167 struct floppy_raw_cmd *my_raw_cmd;
3172 if (FDCS->rawcmd <= 1)
3174 for (drive = 0; drive < N_DRIVE; drive++) {
3175 if (FDC(drive) != fdc)
3177 if (drive == current_drive) {
3178 if (UDRS->fd_ref > 1) {
3182 } else if (UDRS->fd_ref) {
3191 ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
3193 raw_cmd_free(&my_raw_cmd);
3197 raw_cmd = my_raw_cmd;
3198 cont = &raw_cmd_cont;
3199 ret = wait_til_done(floppy_start, true);
3200 debug_dcl(DP->flags, "calling disk change from raw_cmd ioctl\n");
3202 if (ret != -EINTR && FDCS->reset)
3205 DRS->track = NO_TRACK;
3207 ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
3210 raw_cmd_free(&my_raw_cmd);
3214 static int invalidate_drive(struct block_device *bdev)
3216 /* invalidate the buffer track to force a reread */
3217 set_bit((long)bdev->bd_disk->private_data, &fake_change);
3218 process_fd_request();
3219 check_disk_change(bdev);
3223 static int set_geometry(unsigned int cmd, struct floppy_struct *g,
3224 int drive, int type, struct block_device *bdev)
3228 /* sanity checking for parameters. */
3231 g->track <= 0 || g->track > UDP->tracks >> STRETCH(g) ||
3232 /* check if reserved bits are set */
3233 (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_SECTBASEMASK)) != 0)
3236 if (!capable(CAP_SYS_ADMIN))
3238 mutex_lock(&open_lock);
3239 if (lock_fdc(drive, true)) {
3240 mutex_unlock(&open_lock);
3243 floppy_type[type] = *g;
3244 floppy_type[type].name = "user format";
3245 for (cnt = type << 2; cnt < (type << 2) + 4; cnt++)
3246 floppy_sizes[cnt] = floppy_sizes[cnt + 0x80] =
3247 floppy_type[type].size + 1;
3248 process_fd_request();
3249 for (cnt = 0; cnt < N_DRIVE; cnt++) {
3250 struct block_device *bdev = opened_bdev[cnt];
3251 if (!bdev || ITYPE(drive_state[cnt].fd_device) != type)
3253 __invalidate_device(bdev);
3255 mutex_unlock(&open_lock);
3259 if (lock_fdc(drive, true))
3261 if (cmd != FDDEFPRM) {
3262 /* notice a disk change immediately, else
3263 * we lose our settings immediately*/
3264 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3267 oldStretch = g->stretch;
3268 user_params[drive] = *g;
3269 if (buffer_drive == drive)
3270 SUPBOUND(buffer_max, user_params[drive].sect);
3271 current_type[drive] = &user_params[drive];
3272 floppy_sizes[drive] = user_params[drive].size;
3273 if (cmd == FDDEFPRM)
3274 DRS->keep_data = -1;
3277 /* invalidation. Invalidate only when needed, i.e.
3278 * when there are already sectors in the buffer cache
3279 * whose number will change. This is useful, because
3280 * mtools often changes the geometry of the disk after
3281 * looking at the boot block */
3282 if (DRS->maxblock > user_params[drive].sect ||
3284 ((user_params[drive].sect ^ oldStretch) &
3285 (FD_SWAPSIDES | FD_SECTBASEMASK)))
3286 invalidate_drive(bdev);
3288 process_fd_request();
3293 /* handle obsolete ioctl's */
3294 static unsigned int ioctl_table[] = {
3322 static int normalize_ioctl(unsigned int *cmd, int *size)
3326 for (i = 0; i < ARRAY_SIZE(ioctl_table); i++) {
3327 if ((*cmd & 0xffff) == (ioctl_table[i] & 0xffff)) {
3328 *size = _IOC_SIZE(*cmd);
3329 *cmd = ioctl_table[i];
3330 if (*size > _IOC_SIZE(*cmd)) {
3331 pr_info("ioctl not yet supported\n");
3340 static int get_floppy_geometry(int drive, int type, struct floppy_struct **g)
3343 *g = &floppy_type[type];
3345 if (lock_fdc(drive, false))
3347 if (poll_drive(false, 0) == -EINTR)
3349 process_fd_request();
3350 *g = current_type[drive];
3357 static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3359 int drive = (long)bdev->bd_disk->private_data;
3360 int type = ITYPE(drive_state[drive].fd_device);
3361 struct floppy_struct *g;
3364 ret = get_floppy_geometry(drive, type, &g);
3368 geo->heads = g->head;
3369 geo->sectors = g->sect;
3370 geo->cylinders = g->track;
3374 static int fd_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
3375 unsigned long param)
3377 int drive = (long)bdev->bd_disk->private_data;
3378 int type = ITYPE(UDRS->fd_device);
3383 struct floppy_struct g; /* geometry */
3384 struct format_descr f;
3385 struct floppy_max_errors max_errors;
3386 struct floppy_drive_params dp;
3387 } inparam; /* parameters coming from user space */
3388 const void *outparam; /* parameters passed back to user space */
3390 /* convert compatibility eject ioctls into floppy eject ioctl.
3391 * We do this in order to provide a means to eject floppy disks before
3392 * installing the new fdutils package */
3393 if (cmd == CDROMEJECT || /* CD-ROM eject */
3394 cmd == 0x6470) { /* SunOS floppy eject */
3395 DPRINT("obsolete eject ioctl\n");
3396 DPRINT("please use floppycontrol --eject\n");
3400 if (!((cmd & 0xff00) == 0x0200))
3403 /* convert the old style command into a new style command */
3404 ret = normalize_ioctl(&cmd, &size);
3408 /* permission checks */
3409 if (((cmd & 0x40) && !(mode & (FMODE_WRITE | FMODE_WRITE_IOCTL))) ||
3410 ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)))
3413 if (WARN_ON(size < 0 || size > sizeof(inparam)))
3417 memset(&inparam, 0, sizeof(inparam));
3418 if (_IOC_DIR(cmd) & _IOC_WRITE) {
3419 ret = fd_copyin((void __user *)param, &inparam, size);
3426 if (UDRS->fd_ref != 1)
3427 /* somebody else has this drive open */
3429 if (lock_fdc(drive, true))
3432 /* do the actual eject. Fails on
3433 * non-Sparc architectures */
3434 ret = fd_eject(UNIT(drive));
3436 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
3437 set_bit(FD_VERIFY_BIT, &UDRS->flags);
3438 process_fd_request();
3441 if (lock_fdc(drive, true))
3443 current_type[drive] = NULL;
3444 floppy_sizes[drive] = MAX_DISK_SIZE << 1;
3445 UDRS->keep_data = 0;
3446 return invalidate_drive(bdev);
3449 return set_geometry(cmd, &inparam.g, drive, type, bdev);
3451 ret = get_floppy_geometry(drive, type,
3452 (struct floppy_struct **)&outparam);
3457 UDP->flags |= FTD_MSG;
3460 UDP->flags &= ~FTD_MSG;
3463 if (lock_fdc(drive, true))
3465 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3468 process_fd_request();
3469 if (ret & FD_VERIFY)
3471 if (!(ret & FD_DISK_WRITABLE))
3475 if (UDRS->fd_ref != 1)
3477 return do_format(drive, &inparam.f);
3480 if (lock_fdc(drive, true))
3482 return invalidate_drive(bdev);
3483 case FDSETEMSGTRESH:
3484 UDP->max_errors.reporting = (unsigned short)(param & 0x0f);
3487 outparam = &UDP->max_errors;
3490 UDP->max_errors = inparam.max_errors;
3493 outparam = drive_name(type, drive);
3494 SUPBOUND(size, strlen((const char *)outparam) + 1);
3503 if (lock_fdc(drive, true))
3505 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3507 process_fd_request();
3513 return user_reset_fdc(drive, (int)param, true);
3518 memset(UDRWE, 0, sizeof(*UDRWE));
3526 if (lock_fdc(drive, true))
3529 i = raw_cmd_ioctl(cmd, (void __user *)param);
3532 process_fd_request();
3535 if (lock_fdc(drive, true))
3538 process_fd_request();
3544 if (_IOC_DIR(cmd) & _IOC_READ)
3545 return fd_copyout((void __user *)param, outparam, size);
3550 static void __init config_types(void)
3552 bool has_drive = false;
3555 /* read drive info out of physical CMOS */
3558 UDP->cmos = FLOPPY0_TYPE;
3560 if (!UDP->cmos && FLOPPY1_TYPE)
3561 UDP->cmos = FLOPPY1_TYPE;
3563 /* FIXME: additional physical CMOS drive detection should go here */
3565 for (drive = 0; drive < N_DRIVE; drive++) {
3566 unsigned int type = UDP->cmos;
3567 struct floppy_drive_params *params;
3568 const char *name = NULL;
3569 static char temparea[32];
3571 if (type < ARRAY_SIZE(default_drive_params)) {
3572 params = &default_drive_params[type].params;
3574 name = default_drive_params[type].name;
3575 allowed_drive_mask |= 1 << drive;
3577 allowed_drive_mask &= ~(1 << drive);
3579 params = &default_drive_params[0].params;
3580 sprintf(temparea, "unknown type %d (usb?)", type);
3584 const char *prepend;
3588 pr_info("Floppy drive(s):");
3593 pr_cont("%s fd%d is %s", prepend, drive, name);
3602 static int floppy_release(struct gendisk *disk, fmode_t mode)
3604 int drive = (long)disk->private_data;
3606 mutex_lock(&open_lock);
3607 if (UDRS->fd_ref < 0)
3609 else if (!UDRS->fd_ref--) {
3610 DPRINT("floppy_release with fd_ref == 0");
3614 opened_bdev[drive] = NULL;
3615 mutex_unlock(&open_lock);
3621 * floppy_open check for aliasing (/dev/fd0 can be the same as
3622 * /dev/PS0 etc), and disallows simultaneous access to the same
3623 * drive with different device numbers.
3625 static int floppy_open(struct block_device *bdev, fmode_t mode)
3627 int drive = (long)bdev->bd_disk->private_data;
3628 int old_dev, new_dev;
3633 mutex_lock(&open_lock);
3634 old_dev = UDRS->fd_device;
3635 if (opened_bdev[drive] && opened_bdev[drive] != bdev)
3638 if (!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)) {
3639 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
3640 set_bit(FD_VERIFY_BIT, &UDRS->flags);
3643 if (UDRS->fd_ref == -1 || (UDRS->fd_ref && (mode & FMODE_EXCL)))
3646 if (mode & FMODE_EXCL)
3651 opened_bdev[drive] = bdev;
3655 if (!floppy_track_buffer) {
3656 /* if opening an ED drive, reserve a big buffer,
3657 * else reserve a small one */
3658 if ((UDP->cmos == 6) || (UDP->cmos == 5))
3659 try = 64; /* Only 48 actually useful */
3661 try = 32; /* Only 24 actually useful */
3663 tmp = (char *)fd_dma_mem_alloc(1024 * try);
3664 if (!tmp && !floppy_track_buffer) {
3665 try >>= 1; /* buffer only one side */
3667 tmp = (char *)fd_dma_mem_alloc(1024 * try);
3669 if (!tmp && !floppy_track_buffer)
3670 fallback_on_nodma_alloc(&tmp, 2048 * try);
3671 if (!tmp && !floppy_track_buffer) {
3672 DPRINT("Unable to allocate DMA memory\n");
3675 if (floppy_track_buffer) {
3677 fd_dma_mem_free((unsigned long)tmp, try * 1024);
3679 buffer_min = buffer_max = -1;
3680 floppy_track_buffer = tmp;
3681 max_buffer_sectors = try;
3685 new_dev = MINOR(bdev->bd_dev);
3686 UDRS->fd_device = new_dev;
3687 set_capacity(disks[drive], floppy_sizes[new_dev]);
3688 if (old_dev != -1 && old_dev != new_dev) {
3689 if (buffer_drive == drive)
3693 if (UFDCS->rawcmd == 1)
3696 if (!(mode & FMODE_NDELAY)) {
3697 if (mode & (FMODE_READ|FMODE_WRITE)) {
3698 UDRS->last_checked = 0;
3699 check_disk_change(bdev);
3700 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags))
3704 if ((mode & FMODE_WRITE) &&
3705 !test_bit(FD_DISK_WRITABLE_BIT, &UDRS->flags))
3708 mutex_unlock(&open_lock);
3711 if (UDRS->fd_ref < 0)
3716 opened_bdev[drive] = NULL;
3718 mutex_unlock(&open_lock);
3723 * Check if the disk has been changed or if a change has been faked.
3725 static int check_floppy_change(struct gendisk *disk)
3727 int drive = (long)disk->private_data;
3729 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
3730 test_bit(FD_VERIFY_BIT, &UDRS->flags))
3733 if (time_after(jiffies, UDRS->last_checked + UDP->checkfreq)) {
3734 lock_fdc(drive, false);
3735 poll_drive(false, 0);
3736 process_fd_request();
3739 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
3740 test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
3741 test_bit(drive, &fake_change) ||
3742 (!ITYPE(UDRS->fd_device) && !current_type[drive]))
3748 * This implements "read block 0" for floppy_revalidate().
3749 * Needed for format autodetection, checking whether there is
3750 * a disk in the drive, and whether that disk is writable.
3753 static void floppy_rb0_complete(struct bio *bio, int err)
3755 complete((struct completion *)bio->bi_private);
3758 static int __floppy_read_block_0(struct block_device *bdev)
3761 struct bio_vec bio_vec;
3762 struct completion complete;
3766 page = alloc_page(GFP_NOIO);
3768 process_fd_request();
3772 size = bdev->bd_block_size;
3777 bio.bi_io_vec = &bio_vec;
3778 bio_vec.bv_page = page;
3779 bio_vec.bv_len = size;
3780 bio_vec.bv_offset = 0;
3786 bio.bi_flags = BIO_QUIET;
3787 init_completion(&complete);
3788 bio.bi_private = &complete;
3789 bio.bi_end_io = floppy_rb0_complete;
3791 submit_bio(READ, &bio);
3792 generic_unplug_device(bdev_get_queue(bdev));
3793 process_fd_request();
3794 wait_for_completion(&complete);
3801 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
3802 * the bootblock (block 0). "Autodetection" is also needed to check whether
3803 * there is a disk in the drive at all... Thus we also do it for fixed
3804 * geometry formats */
3805 static int floppy_revalidate(struct gendisk *disk)
3807 int drive = (long)disk->private_data;
3808 #define NO_GEOM (!current_type[drive] && !ITYPE(UDRS->fd_device))
3812 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
3813 test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
3814 test_bit(drive, &fake_change) || NO_GEOM) {
3815 if (WARN(atomic_read(&usage_count) == 0,
3816 "VFS: revalidate called on non-open device.\n"))
3819 lock_fdc(drive, false);
3820 cf = (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
3821 test_bit(FD_VERIFY_BIT, &UDRS->flags));
3822 if (!(cf || test_bit(drive, &fake_change) || NO_GEOM)) {
3823 process_fd_request(); /*already done by another thread */
3828 if (buffer_drive == drive)
3830 clear_bit(drive, &fake_change);
3831 clear_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
3836 res = __floppy_read_block_0(opened_bdev[drive]);
3839 poll_drive(false, FD_RAW_NEED_DISK);
3840 process_fd_request();
3843 set_capacity(disk, floppy_sizes[UDRS->fd_device]);
3847 static const struct block_device_operations floppy_fops = {
3848 .owner = THIS_MODULE,
3849 .open = floppy_open,
3850 .release = floppy_release,
3851 .locked_ioctl = fd_ioctl,
3852 .getgeo = fd_getgeo,
3853 .media_changed = check_floppy_change,
3854 .revalidate_disk = floppy_revalidate,
3858 * Floppy Driver initialization
3859 * =============================
3862 /* Determine the floppy disk controller type */
3863 /* This routine was written by David C. Niemi */
3864 static char __init get_fdc_version(void)
3868 output_byte(FD_DUMPREGS); /* 82072 and better know DUMPREGS */
3873 return FDC_NONE; /* No FDC present ??? */
3874 if ((r == 1) && (reply_buffer[0] == 0x80)) {
3875 pr_info("FDC %d is an 8272A\n", fdc);
3876 return FDC_8272A; /* 8272a/765 don't know DUMPREGS */
3879 pr_info("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
3884 if (!fdc_configure()) {
3885 pr_info("FDC %d is an 82072\n", fdc);
3886 return FDC_82072; /* 82072 doesn't know CONFIGURE */
3889 output_byte(FD_PERPENDICULAR);
3890 if (need_more_output() == MORE_OUTPUT) {
3893 pr_info("FDC %d is an 82072A\n", fdc);
3894 return FDC_82072A; /* 82072A as found on Sparcs. */
3897 output_byte(FD_UNLOCK);
3899 if ((r == 1) && (reply_buffer[0] == 0x80)) {
3900 pr_info("FDC %d is a pre-1991 82077\n", fdc);
3901 return FDC_82077_ORIG; /* Pre-1991 82077, doesn't know
3904 if ((r != 1) || (reply_buffer[0] != 0x00)) {
3905 pr_info("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
3909 output_byte(FD_PARTID);
3912 pr_info("FDC %d init: PARTID: unexpected return of %d bytes.\n",
3916 if (reply_buffer[0] == 0x80) {
3917 pr_info("FDC %d is a post-1991 82077\n", fdc);
3918 return FDC_82077; /* Revised 82077AA passes all the tests */
3920 switch (reply_buffer[0] >> 5) {
3922 /* Either a 82078-1 or a 82078SL running at 5Volt */
3923 pr_info("FDC %d is an 82078.\n", fdc);
3926 pr_info("FDC %d is a 44pin 82078\n", fdc);
3929 pr_info("FDC %d is a S82078B\n", fdc);
3932 pr_info("FDC %d is a National Semiconductor PC87306\n", fdc);
3935 pr_info("FDC %d init: 82078 variant with unknown PARTID=%d.\n",
3936 fdc, reply_buffer[0] >> 5);
3937 return FDC_82078_UNKN;
3939 } /* get_fdc_version */
3941 /* lilo configuration */
3943 static void __init floppy_set_flags(int *ints, int param, int param2)
3947 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
3949 default_drive_params[i].params.flags |= param2;
3951 default_drive_params[i].params.flags &= ~param2;
3953 DPRINT("%s flag 0x%x\n", param2 ? "Setting" : "Clearing", param);
3956 static void __init daring(int *ints, int param, int param2)
3960 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
3962 default_drive_params[i].params.select_delay = 0;
3963 default_drive_params[i].params.flags |=
3964 FD_SILENT_DCL_CLEAR;
3966 default_drive_params[i].params.select_delay =
3968 default_drive_params[i].params.flags &=
3969 ~FD_SILENT_DCL_CLEAR;
3972 DPRINT("Assuming %s floppy hardware\n", param ? "standard" : "broken");
3975 static void __init set_cmos(int *ints, int dummy, int dummy2)
3977 int current_drive = 0;
3980 DPRINT("wrong number of parameters for CMOS\n");
3983 current_drive = ints[1];
3984 if (current_drive < 0 || current_drive >= 8) {
3985 DPRINT("bad drive for set_cmos\n");
3989 if (current_drive >= 4 && !FDC2)
3993 DPRINT("setting CMOS code to %d\n", ints[2]);
3996 static struct param_table {
3998 void (*fn) (int *ints, int param, int param2);
4002 } config_params[] __initdata = {
4003 {"allowed_drive_mask", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4004 {"all_drives", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4005 {"asus_pci", NULL, &allowed_drive_mask, 0x33, 0},
4006 {"irq", NULL, &FLOPPY_IRQ, 6, 0},
4007 {"dma", NULL, &FLOPPY_DMA, 2, 0},
4008 {"daring", daring, NULL, 1, 0},
4010 {"two_fdc", NULL, &FDC2, 0x370, 0},
4011 {"one_fdc", NULL, &FDC2, 0, 0},
4013 {"thinkpad", floppy_set_flags, NULL, 1, FD_INVERTED_DCL},
4014 {"broken_dcl", floppy_set_flags, NULL, 1, FD_BROKEN_DCL},
4015 {"messages", floppy_set_flags, NULL, 1, FTD_MSG},
4016 {"silent_dcl_clear", floppy_set_flags, NULL, 1, FD_SILENT_DCL_CLEAR},
4017 {"debug", floppy_set_flags, NULL, 1, FD_DEBUG},
4018 {"nodma", NULL, &can_use_virtual_dma, 1, 0},
4019 {"omnibook", NULL, &can_use_virtual_dma, 1, 0},
4020 {"yesdma", NULL, &can_use_virtual_dma, 0, 0},
4021 {"fifo_depth", NULL, &fifo_depth, 0xa, 0},
4022 {"nofifo", NULL, &no_fifo, 0x20, 0},
4023 {"usefifo", NULL, &no_fifo, 0, 0},
4024 {"cmos", set_cmos, NULL, 0, 0},
4025 {"slow", NULL, &slow_floppy, 1, 0},
4026 {"unexpected_interrupts", NULL, &print_unex, 1, 0},
4027 {"no_unexpected_interrupts", NULL, &print_unex, 0, 0},
4028 {"L40SX", NULL, &print_unex, 0, 0}
4033 static int __init floppy_setup(char *str)
4039 str = get_options(str, ARRAY_SIZE(ints), ints);
4041 for (i = 0; i < ARRAY_SIZE(config_params); i++) {
4042 if (strcmp(str, config_params[i].name) == 0) {
4046 param = config_params[i].def_param;
4047 if (config_params[i].fn)
4048 config_params[i].fn(ints, param,
4051 if (config_params[i].var) {
4052 DPRINT("%s=%d\n", str, param);
4053 *config_params[i].var = param;
4060 DPRINT("unknown floppy option [%s]\n", str);
4062 DPRINT("allowed options are:");
4063 for (i = 0; i < ARRAY_SIZE(config_params); i++)
4064 pr_cont(" %s", config_params[i].name);
4067 DPRINT("botched floppy option\n");
4068 DPRINT("Read Documentation/blockdev/floppy.txt\n");
4072 static int have_no_fdc = -ENODEV;
4074 static ssize_t floppy_cmos_show(struct device *dev,
4075 struct device_attribute *attr, char *buf)
4077 struct platform_device *p = to_platform_device(dev);
4081 return sprintf(buf, "%X\n", UDP->cmos);
4084 static DEVICE_ATTR(cmos, S_IRUGO, floppy_cmos_show, NULL);
4086 static void floppy_device_release(struct device *dev)
4090 static int floppy_resume(struct device *dev)
4094 for (fdc = 0; fdc < N_FDC; fdc++)
4095 if (FDCS->address != -1)
4096 user_reset_fdc(-1, FD_RESET_ALWAYS, false);
4101 static const struct dev_pm_ops floppy_pm_ops = {
4102 .resume = floppy_resume,
4103 .restore = floppy_resume,
4106 static struct platform_driver floppy_driver = {
4109 .pm = &floppy_pm_ops,
4113 static struct platform_device floppy_device[N_DRIVE];
4115 static struct kobject *floppy_find(dev_t dev, int *part, void *data)
4117 int drive = (*part & 3) | ((*part & 0x80) >> 5);
4118 if (drive >= N_DRIVE ||
4119 !(allowed_drive_mask & (1 << drive)) ||
4120 fdc_state[FDC(drive)].version == FDC_NONE)
4122 if (((*part >> 2) & 0x1f) >= ARRAY_SIZE(floppy_type))
4125 return get_disk(disks[drive]);
4128 static int __init floppy_init(void)
4134 interruptjiffies = resultjiffies = jiffies;
4136 #if defined(CONFIG_PPC)
4137 if (check_legacy_ioport(FDC1))
4143 for (dr = 0; dr < N_DRIVE; dr++) {
4144 disks[dr] = alloc_disk(1);
4150 disks[dr]->major = FLOPPY_MAJOR;
4151 disks[dr]->first_minor = TOMINOR(dr);
4152 disks[dr]->fops = &floppy_fops;
4153 sprintf(disks[dr]->disk_name, "fd%d", dr);
4155 init_timer(&motor_off_timer[dr]);
4156 motor_off_timer[dr].data = dr;
4157 motor_off_timer[dr].function = motor_off_callback;
4160 err = register_blkdev(FLOPPY_MAJOR, "fd");
4164 err = platform_driver_register(&floppy_driver);
4166 goto out_unreg_blkdev;
4168 floppy_queue = blk_init_queue(do_fd_request, &floppy_lock);
4169 if (!floppy_queue) {
4171 goto out_unreg_driver;
4173 blk_queue_max_hw_sectors(floppy_queue, 64);
4175 blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
4176 floppy_find, NULL, NULL);
4178 for (i = 0; i < 256; i++)
4180 floppy_sizes[i] = floppy_type[ITYPE(i)].size;
4182 floppy_sizes[i] = MAX_DISK_SIZE << 1;
4184 reschedule_timeout(MAXTIMEOUT, "floppy init");
4187 for (i = 0; i < N_FDC; i++) {
4189 memset(FDCS, 0, sizeof(*FDCS));
4192 #if defined(__sparc__) || defined(__mc68000__)
4193 /*sparcs/sun3x don't have a DOR reset which we can fall back on to */
4197 FDCS->version = FDC_82072A;
4201 use_virtual_dma = can_use_virtual_dma & 1;
4202 fdc_state[0].address = FDC1;
4203 if (fdc_state[0].address == -1) {
4204 del_timer(&fd_timeout);
4206 goto out_unreg_region;
4209 fdc_state[1].address = FDC2;
4212 fdc = 0; /* reset fdc in case of unexpected interrupt */
4213 err = floppy_grab_irq_and_dma();
4215 del_timer(&fd_timeout);
4217 goto out_unreg_region;
4220 /* initialise drive state */
4221 for (drive = 0; drive < N_DRIVE; drive++) {
4222 memset(UDRS, 0, sizeof(*UDRS));
4223 memset(UDRWE, 0, sizeof(*UDRWE));
4224 set_bit(FD_DISK_NEWCHANGE_BIT, &UDRS->flags);
4225 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
4226 set_bit(FD_VERIFY_BIT, &UDRS->flags);
4227 UDRS->fd_device = -1;
4228 floppy_track_buffer = NULL;
4229 max_buffer_sectors = 0;
4232 * Small 10 msec delay to let through any interrupt that
4233 * initialization might have triggered, to not
4234 * confuse detection:
4238 for (i = 0; i < N_FDC; i++) {
4240 FDCS->driver_version = FD_DRIVER_VERSION;
4241 for (unit = 0; unit < 4; unit++)
4242 FDCS->track[unit] = 0;
4243 if (FDCS->address == -1)
4246 if (user_reset_fdc(-1, FD_RESET_ALWAYS, false)) {
4247 /* free ioports reserved by floppy_grab_irq_and_dma() */
4248 floppy_release_regions(fdc);
4250 FDCS->version = FDC_NONE;
4253 /* Try to determine the floppy controller type */
4254 FDCS->version = get_fdc_version();
4255 if (FDCS->version == FDC_NONE) {
4256 /* free ioports reserved by floppy_grab_irq_and_dma() */
4257 floppy_release_regions(fdc);
4261 if (can_use_virtual_dma == 2 && FDCS->version < FDC_82072A)
4262 can_use_virtual_dma = 0;
4265 /* Not all FDCs seem to be able to handle the version command
4266 * properly, so force a reset for the standard FDC clones,
4267 * to avoid interrupt garbage.
4269 user_reset_fdc(-1, FD_RESET_ALWAYS, false);
4272 del_timer(&fd_timeout);
4276 DPRINT("no floppy controllers found\n");
4278 goto out_flush_work;
4281 for (drive = 0; drive < N_DRIVE; drive++) {
4282 if (!(allowed_drive_mask & (1 << drive)))
4284 if (fdc_state[FDC(drive)].version == FDC_NONE)
4287 floppy_device[drive].name = floppy_device_name;
4288 floppy_device[drive].id = drive;
4289 floppy_device[drive].dev.release = floppy_device_release;
4291 err = platform_device_register(&floppy_device[drive]);
4293 goto out_flush_work;
4295 err = device_create_file(&floppy_device[drive].dev,
4298 goto out_unreg_platform_dev;
4300 /* to be cleaned up... */
4301 disks[drive]->private_data = (void *)(long)drive;
4302 disks[drive]->queue = floppy_queue;
4303 disks[drive]->flags |= GENHD_FL_REMOVABLE;
4304 disks[drive]->driverfs_dev = &floppy_device[drive].dev;
4305 add_disk(disks[drive]);
4310 out_unreg_platform_dev:
4311 platform_device_unregister(&floppy_device[drive]);
4313 flush_scheduled_work();
4314 if (atomic_read(&usage_count))
4315 floppy_release_irq_and_dma();
4317 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4318 blk_cleanup_queue(floppy_queue);
4320 platform_driver_unregister(&floppy_driver);
4322 unregister_blkdev(FLOPPY_MAJOR, "fd");
4325 del_timer(&motor_off_timer[dr]);
4326 put_disk(disks[dr]);
4331 static const struct io_region {
4336 /* address + 3 is sometimes reserved by pnp bios for motherboard */
4338 /* address + 6 is reserved, and may be taken by IDE.
4339 * Unfortunately, Adaptec doesn't know this :-(, */
4343 static void floppy_release_allocated_regions(int fdc, const struct io_region *p)
4345 while (p != io_regions) {
4347 release_region(FDCS->address + p->offset, p->size);
4351 #define ARRAY_END(X) (&((X)[ARRAY_SIZE(X)]))
4353 static int floppy_request_regions(int fdc)
4355 const struct io_region *p;
4357 for (p = io_regions; p < ARRAY_END(io_regions); p++) {
4358 if (!request_region(FDCS->address + p->offset,
4359 p->size, "floppy")) {
4360 DPRINT("Floppy io-port 0x%04lx in use\n",
4361 FDCS->address + p->offset);
4362 floppy_release_allocated_regions(fdc, p);
4369 static void floppy_release_regions(int fdc)
4371 floppy_release_allocated_regions(fdc, ARRAY_END(io_regions));
4374 static int floppy_grab_irq_and_dma(void)
4376 if (atomic_inc_return(&usage_count) > 1)
4380 * We might have scheduled a free_irq(), wait it to
4383 flush_scheduled_work();
4385 if (fd_request_irq()) {
4386 DPRINT("Unable to grab IRQ%d for the floppy driver\n",
4388 atomic_dec(&usage_count);
4391 if (fd_request_dma()) {
4392 DPRINT("Unable to grab DMA%d for the floppy driver\n",
4394 if (can_use_virtual_dma & 2)
4395 use_virtual_dma = can_use_virtual_dma = 1;
4396 if (!(can_use_virtual_dma & 1)) {
4398 atomic_dec(&usage_count);
4403 for (fdc = 0; fdc < N_FDC; fdc++) {
4404 if (FDCS->address != -1) {
4405 if (floppy_request_regions(fdc))
4409 for (fdc = 0; fdc < N_FDC; fdc++) {
4410 if (FDCS->address != -1) {
4412 fd_outb(FDCS->dor, FD_DOR);
4416 set_dor(0, ~0, 8); /* avoid immediate interrupt */
4418 for (fdc = 0; fdc < N_FDC; fdc++)
4419 if (FDCS->address != -1)
4420 fd_outb(FDCS->dor, FD_DOR);
4422 * The driver will try and free resources and relies on us
4423 * to know if they were allocated or not.
4426 irqdma_allocated = 1;
4432 floppy_release_regions(fdc);
4433 atomic_dec(&usage_count);
4437 static void floppy_release_irq_and_dma(void)
4444 unsigned long tmpaddr;
4446 if (!atomic_dec_and_test(&usage_count))
4449 if (irqdma_allocated) {
4453 irqdma_allocated = 0;
4459 floppy_enable_hlt();
4461 if (floppy_track_buffer && max_buffer_sectors) {
4462 tmpsize = max_buffer_sectors * 1024;
4463 tmpaddr = (unsigned long)floppy_track_buffer;
4464 floppy_track_buffer = NULL;
4465 max_buffer_sectors = 0;
4466 buffer_min = buffer_max = -1;
4467 fd_dma_mem_free(tmpaddr, tmpsize);
4470 for (drive = 0; drive < N_FDC * 4; drive++)
4471 if (timer_pending(motor_off_timer + drive))
4472 pr_info("motor off timer %d still active\n", drive);
4475 if (timer_pending(&fd_timeout))
4476 pr_info("floppy timer still active:%s\n", timeout_message);
4477 if (timer_pending(&fd_timer))
4478 pr_info("auxiliary floppy timer still active\n");
4479 if (work_pending(&floppy_work))
4480 pr_info("work still pending\n");
4482 for (fdc = 0; fdc < N_FDC; fdc++)
4483 if (FDCS->address != -1)
4484 floppy_release_regions(fdc);
4490 static char *floppy;
4492 static void __init parse_floppy_cfg_string(char *cfg)
4498 while (*cfg && *cfg != ' ' && *cfg != '\t')
4509 static int __init floppy_module_init(void)
4512 parse_floppy_cfg_string(floppy);
4513 return floppy_init();
4515 module_init(floppy_module_init);
4517 static void __exit floppy_module_exit(void)
4521 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4522 unregister_blkdev(FLOPPY_MAJOR, "fd");
4523 platform_driver_unregister(&floppy_driver);
4525 for (drive = 0; drive < N_DRIVE; drive++) {
4526 del_timer_sync(&motor_off_timer[drive]);
4528 if ((allowed_drive_mask & (1 << drive)) &&
4529 fdc_state[FDC(drive)].version != FDC_NONE) {
4530 del_gendisk(disks[drive]);
4531 device_remove_file(&floppy_device[drive].dev, &dev_attr_cmos);
4532 platform_device_unregister(&floppy_device[drive]);
4534 put_disk(disks[drive]);
4537 del_timer_sync(&fd_timeout);
4538 del_timer_sync(&fd_timer);
4539 blk_cleanup_queue(floppy_queue);
4541 if (atomic_read(&usage_count))
4542 floppy_release_irq_and_dma();
4544 /* eject disk, if any */
4548 module_exit(floppy_module_exit);
4550 module_param(floppy, charp, 0);
4551 module_param(FLOPPY_IRQ, int, 0);
4552 module_param(FLOPPY_DMA, int, 0);
4553 MODULE_AUTHOR("Alain L. Knaff");
4554 MODULE_SUPPORTED_DEVICE("fd");
4555 MODULE_LICENSE("GPL");
4557 /* This doesn't actually get used other than for module information */
4558 static const struct pnp_device_id floppy_pnpids[] = {
4563 MODULE_DEVICE_TABLE(pnp, floppy_pnpids);
4567 __setup("floppy=", floppy_setup);
4568 module_init(floppy_init)
4571 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);