x86/xen: resume timer irqs early
[linux/fpc-iii.git] / drivers / block / floppy.c
blobf0bbdecca675247819f963e74f53035d672cb52e
1 /*
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
7 */
9 /*
10 * 02.12.91 - Changed to static variables to indicate need for reset
11 * and recalibrate. This makes some things easier (output_byte reset
12 * checking etc), and means less interrupt jumping in case of errors,
13 * so the code is hopefully easier to understand.
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
29 * etc.
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
46 * recording support.
48 * 1992/9/17: Added DMA allocation & DMA functions. -- hhb.
50 * TODO: Errors are still not counted properly.
53 /* 1992/9/20
54 * Modifications for ``Sector Shifting'' by Rob Hooft (hooft@chem.ruu.nl)
55 * modeled after the freeware MS-DOS program fdformat/88 V1.8 by
56 * Christoph H. Hochst\"atter.
57 * I have fixed the shift values to the ones I always use. Maybe a new
58 * ioctl() should be created to be able to modify them.
59 * There is a bug in the driver that makes it impossible to format a
60 * floppy as the first thing after bootup.
64 * 1993/4/29 -- Linus -- cleaned up the timer handling in the kernel, and
65 * this helped the floppy driver as well. Much cleaner, and still seems to
66 * work.
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
74 * disk types.
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
113 * failures.
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
129 * - s/suser/capable/
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
151 #define DEBUGT 2
153 #define DPRINT(format, args...) \
154 pr_info("floppy%d: " format, current_drive, ##args)
156 #define DCL_DEBUG /* debug disk change line */
157 #ifdef DCL_DEBUG
158 #define debug_dcl(test, fmt, args...) \
159 do { if ((test) & FD_DEBUG) DPRINT(fmt, ##args); } while (0)
160 #else
161 #define debug_dcl(test, fmt, args...) \
162 do { if (0) DPRINT(fmt, ##args); } while (0)
163 #endif
165 /* do print messages for unexpected interrupts */
166 static int print_unex = 1;
167 #include <linux/module.h>
168 #include <linux/sched.h>
169 #include <linux/fs.h>
170 #include <linux/kernel.h>
171 #include <linux/timer.h>
172 #include <linux/workqueue.h>
173 #define FDPATCHES
174 #include <linux/fdreg.h>
175 #include <linux/fd.h>
176 #include <linux/hdreg.h>
177 #include <linux/errno.h>
178 #include <linux/slab.h>
179 #include <linux/mm.h>
180 #include <linux/bio.h>
181 #include <linux/string.h>
182 #include <linux/jiffies.h>
183 #include <linux/fcntl.h>
184 #include <linux/delay.h>
185 #include <linux/mc146818rtc.h> /* CMOS defines */
186 #include <linux/ioport.h>
187 #include <linux/interrupt.h>
188 #include <linux/init.h>
189 #include <linux/platform_device.h>
190 #include <linux/mod_devicetable.h>
191 #include <linux/mutex.h>
192 #include <linux/io.h>
193 #include <linux/uaccess.h>
194 #include <linux/async.h>
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 DEFINE_MUTEX(floppy_mutex);
202 static int slow_floppy;
204 #include <asm/dma.h>
205 #include <asm/irq.h>
207 static int FLOPPY_IRQ = 6;
208 static int FLOPPY_DMA = 2;
209 static int can_use_virtual_dma = 2;
210 /* =======
211 * can use virtual DMA:
212 * 0 = use of virtual DMA disallowed by config
213 * 1 = use of virtual DMA prescribed by config
214 * 2 = no virtual DMA preference configured. By default try hard DMA,
215 * but fall back on virtual DMA when not enough memory available
218 static int use_virtual_dma;
219 /* =======
220 * use virtual DMA
221 * 0 using hard DMA
222 * 1 using virtual DMA
223 * This variable is set to virtual when a DMA mem problem arises, and
224 * reset back in floppy_grab_irq_and_dma.
225 * It is not safe to reset it in other circumstances, because the floppy
226 * driver may have several buffers in use at once, and we do currently not
227 * record each buffers capabilities
230 static DEFINE_SPINLOCK(floppy_lock);
232 static unsigned short virtual_dma_port = 0x3f0;
233 irqreturn_t floppy_interrupt(int irq, void *dev_id);
234 static int set_dor(int fdc, char mask, char data);
236 #define K_64 0x10000 /* 64KB */
238 /* the following is the mask of allowed drives. By default units 2 and
239 * 3 of both floppy controllers are disabled, because switching on the
240 * motor of these drives causes system hangs on some PCI computers. drive
241 * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
242 * a drive is allowed.
244 * NOTE: This must come before we include the arch floppy header because
245 * some ports reference this variable from there. -DaveM
248 static int allowed_drive_mask = 0x33;
250 #include <asm/floppy.h>
252 static int irqdma_allocated;
254 #include <linux/blkdev.h>
255 #include <linux/blkpg.h>
256 #include <linux/cdrom.h> /* for the compatibility eject ioctl */
257 #include <linux/completion.h>
259 static struct request *current_req;
260 static void do_fd_request(struct request_queue *q);
261 static int set_next_request(void);
263 #ifndef fd_get_dma_residue
264 #define fd_get_dma_residue() get_dma_residue(FLOPPY_DMA)
265 #endif
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))
271 #endif
273 #ifndef fd_dma_mem_alloc
274 #define fd_dma_mem_alloc(size) __get_dma_pages(GFP_KERNEL, get_order(size))
275 #endif
277 static inline void fallback_on_nodma_alloc(char **addr, size_t l)
279 #ifdef FLOPPY_CAN_FALLBACK_ON_NODMA
280 if (*addr)
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);
286 #else
287 return;
288 #endif
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)
316 /* read/write */
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])
326 #define NR_RW 9
328 /* format */
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])
333 #define NR_F 6
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.
362 static struct {
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!
367 CMOS drive type
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
403 * | Native format
404 * Frequency of disk change checks */
407 static struct floppy_drive_params drive_params[N_DRIVE];
408 static struct floppy_drive_struct drive_state[N_DRIVE];
409 static struct floppy_write_errors write_errors[N_DRIVE];
410 static struct timer_list motor_off_timer[N_DRIVE];
411 static struct gendisk *disks[N_DRIVE];
412 static struct block_device *opened_bdev[N_DRIVE];
413 static DEFINE_MUTEX(open_lock);
414 static struct floppy_raw_cmd *raw_cmd, default_raw_cmd;
415 static int fdc_queue;
418 * This struct defines the different floppy types.
420 * Bit 0 of 'stretch' tells if the tracks need to be doubled for some
421 * types (e.g. 360kB diskette in 1.2MB drive, etc.). Bit 1 of 'stretch'
422 * tells if the disk is in Commodore 1581 format, which means side 0 sectors
423 * are located on side 1 of the disk but with a side 0 ID, and vice-versa.
424 * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
425 * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
426 * side 0 is on physical side 0 (but with the misnamed sector IDs).
427 * 'stretch' should probably be renamed to something more general, like
428 * 'options'.
430 * Bits 2 through 9 of 'stretch' tell the number of the first sector.
431 * The LSB (bit 2) is flipped. For most disks, the first sector
432 * is 1 (represented by 0x00<<2). For some CP/M and music sampler
433 * disks (such as Ensoniq EPS 16plus) it is 0 (represented as 0x01<<2).
434 * For Amstrad CPC disks it is 0xC1 (represented as 0xC0<<2).
436 * Other parameters should be self-explanatory (see also setfdprm(8)).
439 Size
440 | Sectors per track
441 | | Head
442 | | | Tracks
443 | | | | Stretch
444 | | | | | Gap 1 size
445 | | | | | | Data rate, | 0x40 for perp
446 | | | | | | | Spec1 (stepping rate, head unload
447 | | | | | | | | /fmt gap (gap2) */
448 static struct floppy_struct floppy_type[32] = {
449 { 0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL }, /* 0 no testing */
450 { 720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360" }, /* 1 360KB PC */
451 { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /* 2 1.2MB AT */
452 { 720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360" }, /* 3 360KB SS 3.5" */
453 { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720" }, /* 4 720KB 3.5" */
454 { 720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360" }, /* 5 360KB AT */
455 { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720" }, /* 6 720KB AT */
456 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /* 7 1.44MB 3.5" */
457 { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /* 8 2.88MB 3.5" */
458 { 6240,39,2,80,0,0x1B,0x43,0xAF,0x28,"E3120" }, /* 9 3.12MB 3.5" */
460 { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25" */
461 { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5" */
462 { 820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410" }, /* 12 410KB 5.25" */
463 { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820" }, /* 13 820KB 3.5" */
464 { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25" */
465 { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5" */
466 { 840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420" }, /* 16 420KB 5.25" */
467 { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830" }, /* 17 830KB 3.5" */
468 { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25" */
469 { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5" */
471 { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880" }, /* 20 880KB 5.25" */
472 { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5" */
473 { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5" */
474 { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25" */
475 { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5" */
476 { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5" */
477 { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5" */
478 { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5" */
479 { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5" */
480 { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5" */
482 { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800" }, /* 30 800KB 3.5" */
483 { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5" */
486 #define SECTSIZE (_FD_SECTSIZE(*floppy))
488 /* Auto-detection: Disk type used until the next media change occurs. */
489 static struct floppy_struct *current_type[N_DRIVE];
492 * User-provided type information. current_type points to
493 * the respective entry of this array.
495 static struct floppy_struct user_params[N_DRIVE];
497 static sector_t floppy_sizes[256];
499 static char floppy_device_name[] = "floppy";
502 * The driver is trying to determine the correct media format
503 * while probing is set. rw_interrupt() clears it after a
504 * successful access.
506 static int probing;
508 /* Synchronization of FDC access. */
509 #define FD_COMMAND_NONE -1
510 #define FD_COMMAND_ERROR 2
511 #define FD_COMMAND_OKAY 3
513 static volatile int command_status = FD_COMMAND_NONE;
514 static unsigned long fdc_busy;
515 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
516 static DECLARE_WAIT_QUEUE_HEAD(command_done);
518 /* Errors during formatting are counted here. */
519 static int format_errors;
521 /* Format request descriptor. */
522 static struct format_descr format_req;
525 * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
526 * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
527 * H is head unload time (1=16ms, 2=32ms, etc)
531 * Track buffer
532 * Because these are written to by the DMA controller, they must
533 * not contain a 64k byte boundary crossing, or data will be
534 * corrupted/lost.
536 static char *floppy_track_buffer;
537 static int max_buffer_sectors;
539 static int *errors;
540 typedef void (*done_f)(int);
541 static const struct cont_t {
542 void (*interrupt)(void);
543 /* this is called after the interrupt of the
544 * main command */
545 void (*redo)(void); /* this is called to retry the operation */
546 void (*error)(void); /* this is called to tally an error */
547 done_f done; /* this is called to say if the operation has
548 * succeeded/failed */
549 } *cont;
551 static void floppy_ready(void);
552 static void floppy_start(void);
553 static void process_fd_request(void);
554 static void recalibrate_floppy(void);
555 static void floppy_shutdown(struct work_struct *);
557 static int floppy_request_regions(int);
558 static void floppy_release_regions(int);
559 static int floppy_grab_irq_and_dma(void);
560 static void floppy_release_irq_and_dma(void);
563 * The "reset" variable should be tested whenever an interrupt is scheduled,
564 * after the commands have been sent. This is to ensure that the driver doesn't
565 * get wedged when the interrupt doesn't come because of a failed command.
566 * reset doesn't need to be tested before sending commands, because
567 * output_byte is automatically disabled when reset is set.
569 static void reset_fdc(void);
572 * These are global variables, as that's the easiest way to give
573 * information to interrupts. They are the data used for the current
574 * request.
576 #define NO_TRACK -1
577 #define NEED_1_RECAL -2
578 #define NEED_2_RECAL -3
580 static atomic_t usage_count = ATOMIC_INIT(0);
582 /* buffer related variables */
583 static int buffer_track = -1;
584 static int buffer_drive = -1;
585 static int buffer_min = -1;
586 static int buffer_max = -1;
588 /* fdc related variables, should end up in a struct */
589 static struct floppy_fdc_state fdc_state[N_FDC];
590 static int fdc; /* current fdc */
592 static struct workqueue_struct *floppy_wq;
594 static struct floppy_struct *_floppy = floppy_type;
595 static unsigned char current_drive;
596 static long current_count_sectors;
597 static unsigned char fsector_t; /* sector in track */
598 static unsigned char in_sector_offset; /* offset within physical sector,
599 * expressed in units of 512 bytes */
601 static inline bool drive_no_geom(int drive)
603 return !current_type[drive] && !ITYPE(UDRS->fd_device);
606 #ifndef fd_eject
607 static inline int fd_eject(int drive)
609 return -EINVAL;
611 #endif
614 * Debugging
615 * =========
617 #ifdef DEBUGT
618 static long unsigned debugtimer;
620 static inline void set_debugt(void)
622 debugtimer = jiffies;
625 static inline void debugt(const char *func, const char *msg)
627 if (DP->flags & DEBUGT)
628 pr_info("%s:%s dtime=%lu\n", func, msg, jiffies - debugtimer);
630 #else
631 static inline void set_debugt(void) { }
632 static inline void debugt(const char *func, const char *msg) { }
633 #endif /* DEBUGT */
636 static DECLARE_DELAYED_WORK(fd_timeout, floppy_shutdown);
637 static const char *timeout_message;
639 static void is_alive(const char *func, const char *message)
641 /* this routine checks whether the floppy driver is "alive" */
642 if (test_bit(0, &fdc_busy) && command_status < 2 &&
643 !delayed_work_pending(&fd_timeout)) {
644 DPRINT("%s: timeout handler died. %s\n", func, message);
648 static void (*do_floppy)(void) = NULL;
650 #define OLOGSIZE 20
652 static void (*lasthandler)(void);
653 static unsigned long interruptjiffies;
654 static unsigned long resultjiffies;
655 static int resultsize;
656 static unsigned long lastredo;
658 static struct output_log {
659 unsigned char data;
660 unsigned char status;
661 unsigned long jiffies;
662 } output_log[OLOGSIZE];
664 static int output_log_pos;
666 #define current_reqD -1
667 #define MAXTIMEOUT -2
669 static void __reschedule_timeout(int drive, const char *message)
671 unsigned long delay;
673 if (drive == current_reqD)
674 drive = current_drive;
676 if (drive < 0 || drive >= N_DRIVE) {
677 delay = 20UL * HZ;
678 drive = 0;
679 } else
680 delay = UDP->timeout;
682 mod_delayed_work(floppy_wq, &fd_timeout, delay);
683 if (UDP->flags & FD_DEBUG)
684 DPRINT("reschedule timeout %s\n", message);
685 timeout_message = message;
688 static void reschedule_timeout(int drive, const char *message)
690 unsigned long flags;
692 spin_lock_irqsave(&floppy_lock, flags);
693 __reschedule_timeout(drive, message);
694 spin_unlock_irqrestore(&floppy_lock, flags);
697 #define INFBOUND(a, b) (a) = max_t(int, a, b)
698 #define SUPBOUND(a, b) (a) = min_t(int, a, b)
701 * Bottom half floppy driver.
702 * ==========================
704 * This part of the file contains the code talking directly to the hardware,
705 * and also the main service loop (seek-configure-spinup-command)
709 * disk change.
710 * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
711 * and the last_checked date.
713 * last_checked is the date of the last check which showed 'no disk change'
714 * FD_DISK_CHANGE is set under two conditions:
715 * 1. The floppy has been changed after some i/o to that floppy already
716 * took place.
717 * 2. No floppy disk is in the drive. This is done in order to ensure that
718 * requests are quickly flushed in case there is no disk in the drive. It
719 * follows that FD_DISK_CHANGE can only be cleared if there is a disk in
720 * the drive.
722 * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
723 * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
724 * each seek. If a disk is present, the disk change line should also be
725 * cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
726 * change line is set, this means either that no disk is in the drive, or
727 * that it has been removed since the last seek.
729 * This means that we really have a third possibility too:
730 * The floppy has been changed after the last seek.
733 static int disk_change(int drive)
735 int fdc = FDC(drive);
737 if (time_before(jiffies, UDRS->select_date + UDP->select_delay))
738 DPRINT("WARNING disk change called early\n");
739 if (!(FDCS->dor & (0x10 << UNIT(drive))) ||
740 (FDCS->dor & 3) != UNIT(drive) || fdc != FDC(drive)) {
741 DPRINT("probing disk change on unselected drive\n");
742 DPRINT("drive=%d fdc=%d dor=%x\n", drive, FDC(drive),
743 (unsigned int)FDCS->dor);
746 debug_dcl(UDP->flags,
747 "checking disk change line for drive %d\n", drive);
748 debug_dcl(UDP->flags, "jiffies=%lu\n", jiffies);
749 debug_dcl(UDP->flags, "disk change line=%x\n", fd_inb(FD_DIR) & 0x80);
750 debug_dcl(UDP->flags, "flags=%lx\n", UDRS->flags);
752 if (UDP->flags & FD_BROKEN_DCL)
753 return test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
754 if ((fd_inb(FD_DIR) ^ UDP->flags) & 0x80) {
755 set_bit(FD_VERIFY_BIT, &UDRS->flags);
756 /* verify write protection */
758 if (UDRS->maxblock) /* mark it changed */
759 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
761 /* invalidate its geometry */
762 if (UDRS->keep_data >= 0) {
763 if ((UDP->flags & FTD_MSG) &&
764 current_type[drive] != NULL)
765 DPRINT("Disk type is undefined after disk change\n");
766 current_type[drive] = NULL;
767 floppy_sizes[TOMINOR(drive)] = MAX_DISK_SIZE << 1;
770 return 1;
771 } else {
772 UDRS->last_checked = jiffies;
773 clear_bit(FD_DISK_NEWCHANGE_BIT, &UDRS->flags);
775 return 0;
778 static inline int is_selected(int dor, int unit)
780 return ((dor & (0x10 << unit)) && (dor & 3) == unit);
783 static bool is_ready_state(int status)
785 int state = status & (STATUS_READY | STATUS_DIR | STATUS_DMA);
786 return state == STATUS_READY;
789 static int set_dor(int fdc, char mask, char data)
791 unsigned char unit;
792 unsigned char drive;
793 unsigned char newdor;
794 unsigned char olddor;
796 if (FDCS->address == -1)
797 return -1;
799 olddor = FDCS->dor;
800 newdor = (olddor & mask) | data;
801 if (newdor != olddor) {
802 unit = olddor & 0x3;
803 if (is_selected(olddor, unit) && !is_selected(newdor, unit)) {
804 drive = REVDRIVE(fdc, unit);
805 debug_dcl(UDP->flags,
806 "calling disk change from set_dor\n");
807 disk_change(drive);
809 FDCS->dor = newdor;
810 fd_outb(newdor, FD_DOR);
812 unit = newdor & 0x3;
813 if (!is_selected(olddor, unit) && is_selected(newdor, unit)) {
814 drive = REVDRIVE(fdc, unit);
815 UDRS->select_date = jiffies;
818 return olddor;
821 static void twaddle(void)
823 if (DP->select_delay)
824 return;
825 fd_outb(FDCS->dor & ~(0x10 << UNIT(current_drive)), FD_DOR);
826 fd_outb(FDCS->dor, FD_DOR);
827 DRS->select_date = jiffies;
831 * Reset all driver information about the current fdc.
832 * This is needed after a reset, and after a raw command.
834 static void reset_fdc_info(int mode)
836 int drive;
838 FDCS->spec1 = FDCS->spec2 = -1;
839 FDCS->need_configure = 1;
840 FDCS->perp_mode = 1;
841 FDCS->rawcmd = 0;
842 for (drive = 0; drive < N_DRIVE; drive++)
843 if (FDC(drive) == fdc && (mode || UDRS->track != NEED_1_RECAL))
844 UDRS->track = NEED_2_RECAL;
847 /* selects the fdc and drive, and enables the fdc's input/dma. */
848 static void set_fdc(int drive)
850 if (drive >= 0 && drive < N_DRIVE) {
851 fdc = FDC(drive);
852 current_drive = drive;
854 if (fdc != 1 && fdc != 0) {
855 pr_info("bad fdc value\n");
856 return;
858 set_dor(fdc, ~0, 8);
859 #if N_FDC > 1
860 set_dor(1 - fdc, ~8, 0);
861 #endif
862 if (FDCS->rawcmd == 2)
863 reset_fdc_info(1);
864 if (fd_inb(FD_STATUS) != STATUS_READY)
865 FDCS->reset = 1;
868 /* locks the driver */
869 static int lock_fdc(int drive, bool interruptible)
871 if (WARN(atomic_read(&usage_count) == 0,
872 "Trying to lock fdc while usage count=0\n"))
873 return -1;
875 if (wait_event_interruptible(fdc_wait, !test_and_set_bit(0, &fdc_busy)))
876 return -EINTR;
878 command_status = FD_COMMAND_NONE;
880 reschedule_timeout(drive, "lock fdc");
881 set_fdc(drive);
882 return 0;
885 /* unlocks the driver */
886 static void unlock_fdc(void)
888 if (!test_bit(0, &fdc_busy))
889 DPRINT("FDC access conflict!\n");
891 raw_cmd = NULL;
892 command_status = FD_COMMAND_NONE;
893 cancel_delayed_work(&fd_timeout);
894 do_floppy = NULL;
895 cont = NULL;
896 clear_bit(0, &fdc_busy);
897 wake_up(&fdc_wait);
900 /* switches the motor off after a given timeout */
901 static void motor_off_callback(unsigned long nr)
903 unsigned char mask = ~(0x10 << UNIT(nr));
905 set_dor(FDC(nr), mask, 0);
908 /* schedules motor off */
909 static void floppy_off(unsigned int drive)
911 unsigned long volatile delta;
912 int fdc = FDC(drive);
914 if (!(FDCS->dor & (0x10 << UNIT(drive))))
915 return;
917 del_timer(motor_off_timer + drive);
919 /* make spindle stop in a position which minimizes spinup time
920 * next time */
921 if (UDP->rps) {
922 delta = jiffies - UDRS->first_read_date + HZ -
923 UDP->spindown_offset;
924 delta = ((delta * UDP->rps) % HZ) / UDP->rps;
925 motor_off_timer[drive].expires =
926 jiffies + UDP->spindown - delta;
928 add_timer(motor_off_timer + drive);
932 * cycle through all N_DRIVE floppy drives, for disk change testing.
933 * stopping at current drive. This is done before any long operation, to
934 * be sure to have up to date disk change information.
936 static void scandrives(void)
938 int i;
939 int drive;
940 int saved_drive;
942 if (DP->select_delay)
943 return;
945 saved_drive = current_drive;
946 for (i = 0; i < N_DRIVE; i++) {
947 drive = (saved_drive + i + 1) % N_DRIVE;
948 if (UDRS->fd_ref == 0 || UDP->select_delay != 0)
949 continue; /* skip closed drives */
950 set_fdc(drive);
951 if (!(set_dor(fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) &
952 (0x10 << UNIT(drive))))
953 /* switch the motor off again, if it was off to
954 * begin with */
955 set_dor(fdc, ~(0x10 << UNIT(drive)), 0);
957 set_fdc(saved_drive);
960 static void empty(void)
964 static DECLARE_WORK(floppy_work, NULL);
966 static void schedule_bh(void (*handler)(void))
968 WARN_ON(work_pending(&floppy_work));
970 PREPARE_WORK(&floppy_work, (work_func_t)handler);
971 queue_work(floppy_wq, &floppy_work);
974 static DECLARE_DELAYED_WORK(fd_timer, NULL);
976 static void cancel_activity(void)
978 do_floppy = NULL;
979 cancel_delayed_work_sync(&fd_timer);
980 cancel_work_sync(&floppy_work);
983 /* this function makes sure that the disk stays in the drive during the
984 * transfer */
985 static void fd_watchdog(struct work_struct *arg)
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");
991 cancel_activity();
992 cont->done(0);
993 reset_fdc();
994 } else {
995 cancel_delayed_work(&fd_timer);
996 PREPARE_DELAYED_WORK(&fd_timer, fd_watchdog);
997 queue_delayed_work(floppy_wq, &fd_timer, HZ / 10);
1001 static void main_command_interrupt(void)
1003 cancel_delayed_work(&fd_timer);
1004 cont->interrupt();
1007 /* waits for a delay (spinup or select) to pass */
1008 static int fd_wait_for_completion(unsigned long expires, work_func_t function)
1010 if (FDCS->reset) {
1011 reset_fdc(); /* do the reset during sleep to win time
1012 * if we don't need to sleep, it's a good
1013 * occasion anyways */
1014 return 1;
1017 if (time_before(jiffies, expires)) {
1018 cancel_delayed_work(&fd_timer);
1019 PREPARE_DELAYED_WORK(&fd_timer, function);
1020 queue_delayed_work(floppy_wq, &fd_timer, expires - jiffies);
1021 return 1;
1023 return 0;
1026 static void setup_DMA(void)
1028 unsigned long f;
1030 if (raw_cmd->length == 0) {
1031 int i;
1033 pr_info("zero dma transfer size:");
1034 for (i = 0; i < raw_cmd->cmd_count; i++)
1035 pr_cont("%x,", raw_cmd->cmd[i]);
1036 pr_cont("\n");
1037 cont->done(0);
1038 FDCS->reset = 1;
1039 return;
1041 if (((unsigned long)raw_cmd->kernel_data) % 512) {
1042 pr_info("non aligned address: %p\n", raw_cmd->kernel_data);
1043 cont->done(0);
1044 FDCS->reset = 1;
1045 return;
1047 f = claim_dma_lock();
1048 fd_disable_dma();
1049 #ifdef fd_dma_setup
1050 if (fd_dma_setup(raw_cmd->kernel_data, raw_cmd->length,
1051 (raw_cmd->flags & FD_RAW_READ) ?
1052 DMA_MODE_READ : DMA_MODE_WRITE, FDCS->address) < 0) {
1053 release_dma_lock(f);
1054 cont->done(0);
1055 FDCS->reset = 1;
1056 return;
1058 release_dma_lock(f);
1059 #else
1060 fd_clear_dma_ff();
1061 fd_cacheflush(raw_cmd->kernel_data, raw_cmd->length);
1062 fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ) ?
1063 DMA_MODE_READ : DMA_MODE_WRITE);
1064 fd_set_dma_addr(raw_cmd->kernel_data);
1065 fd_set_dma_count(raw_cmd->length);
1066 virtual_dma_port = FDCS->address;
1067 fd_enable_dma();
1068 release_dma_lock(f);
1069 #endif
1072 static void show_floppy(void);
1074 /* waits until the fdc becomes ready */
1075 static int wait_til_ready(void)
1077 int status;
1078 int counter;
1080 if (FDCS->reset)
1081 return -1;
1082 for (counter = 0; counter < 10000; counter++) {
1083 status = fd_inb(FD_STATUS);
1084 if (status & STATUS_READY)
1085 return status;
1087 if (initialized) {
1088 DPRINT("Getstatus times out (%x) on fdc %d\n", status, fdc);
1089 show_floppy();
1091 FDCS->reset = 1;
1092 return -1;
1095 /* sends a command byte to the fdc */
1096 static int output_byte(char byte)
1098 int status = wait_til_ready();
1100 if (status < 0)
1101 return -1;
1103 if (is_ready_state(status)) {
1104 fd_outb(byte, FD_DATA);
1105 output_log[output_log_pos].data = byte;
1106 output_log[output_log_pos].status = status;
1107 output_log[output_log_pos].jiffies = jiffies;
1108 output_log_pos = (output_log_pos + 1) % OLOGSIZE;
1109 return 0;
1111 FDCS->reset = 1;
1112 if (initialized) {
1113 DPRINT("Unable to send byte %x to FDC. Fdc=%x Status=%x\n",
1114 byte, fdc, status);
1115 show_floppy();
1117 return -1;
1120 /* gets the response from the fdc */
1121 static int result(void)
1123 int i;
1124 int status = 0;
1126 for (i = 0; i < MAX_REPLIES; i++) {
1127 status = wait_til_ready();
1128 if (status < 0)
1129 break;
1130 status &= STATUS_DIR | STATUS_READY | STATUS_BUSY | STATUS_DMA;
1131 if ((status & ~STATUS_BUSY) == STATUS_READY) {
1132 resultjiffies = jiffies;
1133 resultsize = i;
1134 return i;
1136 if (status == (STATUS_DIR | STATUS_READY | STATUS_BUSY))
1137 reply_buffer[i] = fd_inb(FD_DATA);
1138 else
1139 break;
1141 if (initialized) {
1142 DPRINT("get result error. Fdc=%d Last status=%x Read bytes=%d\n",
1143 fdc, status, i);
1144 show_floppy();
1146 FDCS->reset = 1;
1147 return -1;
1150 #define MORE_OUTPUT -2
1151 /* does the fdc need more output? */
1152 static int need_more_output(void)
1154 int status = wait_til_ready();
1156 if (status < 0)
1157 return -1;
1159 if (is_ready_state(status))
1160 return MORE_OUTPUT;
1162 return result();
1165 /* Set perpendicular mode as required, based on data rate, if supported.
1166 * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
1168 static void perpendicular_mode(void)
1170 unsigned char perp_mode;
1172 if (raw_cmd->rate & 0x40) {
1173 switch (raw_cmd->rate & 3) {
1174 case 0:
1175 perp_mode = 2;
1176 break;
1177 case 3:
1178 perp_mode = 3;
1179 break;
1180 default:
1181 DPRINT("Invalid data rate for perpendicular mode!\n");
1182 cont->done(0);
1183 FDCS->reset = 1;
1185 * convenient way to return to
1186 * redo without too much hassle
1187 * (deep stack et al.)
1189 return;
1191 } else
1192 perp_mode = 0;
1194 if (FDCS->perp_mode == perp_mode)
1195 return;
1196 if (FDCS->version >= FDC_82077_ORIG) {
1197 output_byte(FD_PERPENDICULAR);
1198 output_byte(perp_mode);
1199 FDCS->perp_mode = perp_mode;
1200 } else if (perp_mode) {
1201 DPRINT("perpendicular mode not supported by this FDC.\n");
1203 } /* perpendicular_mode */
1205 static int fifo_depth = 0xa;
1206 static int no_fifo;
1208 static int fdc_configure(void)
1210 /* Turn on FIFO */
1211 output_byte(FD_CONFIGURE);
1212 if (need_more_output() != MORE_OUTPUT)
1213 return 0;
1214 output_byte(0);
1215 output_byte(0x10 | (no_fifo & 0x20) | (fifo_depth & 0xf));
1216 output_byte(0); /* pre-compensation from track
1217 0 upwards */
1218 return 1;
1221 #define NOMINAL_DTR 500
1223 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1224 * head load time, and DMA disable flag to values needed by floppy.
1226 * The value "dtr" is the data transfer rate in Kbps. It is needed
1227 * to account for the data rate-based scaling done by the 82072 and 82077
1228 * FDC types. This parameter is ignored for other types of FDCs (i.e.
1229 * 8272a).
1231 * Note that changing the data transfer rate has a (probably deleterious)
1232 * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1233 * fdc_specify is called again after each data transfer rate
1234 * change.
1236 * srt: 1000 to 16000 in microseconds
1237 * hut: 16 to 240 milliseconds
1238 * hlt: 2 to 254 milliseconds
1240 * These values are rounded up to the next highest available delay time.
1242 static void fdc_specify(void)
1244 unsigned char spec1;
1245 unsigned char spec2;
1246 unsigned long srt;
1247 unsigned long hlt;
1248 unsigned long hut;
1249 unsigned long dtr = NOMINAL_DTR;
1250 unsigned long scale_dtr = NOMINAL_DTR;
1251 int hlt_max_code = 0x7f;
1252 int hut_max_code = 0xf;
1254 if (FDCS->need_configure && FDCS->version >= FDC_82072A) {
1255 fdc_configure();
1256 FDCS->need_configure = 0;
1259 switch (raw_cmd->rate & 0x03) {
1260 case 3:
1261 dtr = 1000;
1262 break;
1263 case 1:
1264 dtr = 300;
1265 if (FDCS->version >= FDC_82078) {
1266 /* chose the default rate table, not the one
1267 * where 1 = 2 Mbps */
1268 output_byte(FD_DRIVESPEC);
1269 if (need_more_output() == MORE_OUTPUT) {
1270 output_byte(UNIT(current_drive));
1271 output_byte(0xc0);
1274 break;
1275 case 2:
1276 dtr = 250;
1277 break;
1280 if (FDCS->version >= FDC_82072) {
1281 scale_dtr = dtr;
1282 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1283 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1286 /* Convert step rate from microseconds to milliseconds and 4 bits */
1287 srt = 16 - DIV_ROUND_UP(DP->srt * scale_dtr / 1000, NOMINAL_DTR);
1288 if (slow_floppy)
1289 srt = srt / 4;
1291 SUPBOUND(srt, 0xf);
1292 INFBOUND(srt, 0);
1294 hlt = DIV_ROUND_UP(DP->hlt * scale_dtr / 2, NOMINAL_DTR);
1295 if (hlt < 0x01)
1296 hlt = 0x01;
1297 else if (hlt > 0x7f)
1298 hlt = hlt_max_code;
1300 hut = DIV_ROUND_UP(DP->hut * scale_dtr / 16, NOMINAL_DTR);
1301 if (hut < 0x1)
1302 hut = 0x1;
1303 else if (hut > 0xf)
1304 hut = hut_max_code;
1306 spec1 = (srt << 4) | hut;
1307 spec2 = (hlt << 1) | (use_virtual_dma & 1);
1309 /* If these parameters did not change, just return with success */
1310 if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1311 /* Go ahead and set spec1 and spec2 */
1312 output_byte(FD_SPECIFY);
1313 output_byte(FDCS->spec1 = spec1);
1314 output_byte(FDCS->spec2 = spec2);
1316 } /* fdc_specify */
1318 /* Set the FDC's data transfer rate on behalf of the specified drive.
1319 * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1320 * of the specify command (i.e. using the fdc_specify function).
1322 static int fdc_dtr(void)
1324 /* If data rate not already set to desired value, set it. */
1325 if ((raw_cmd->rate & 3) == FDCS->dtr)
1326 return 0;
1328 /* Set dtr */
1329 fd_outb(raw_cmd->rate & 3, FD_DCR);
1331 /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1332 * need a stabilization period of several milliseconds to be
1333 * enforced after data rate changes before R/W operations.
1334 * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1336 FDCS->dtr = raw_cmd->rate & 3;
1337 return fd_wait_for_completion(jiffies + 2UL * HZ / 100,
1338 (work_func_t)floppy_ready);
1339 } /* fdc_dtr */
1341 static void tell_sector(void)
1343 pr_cont(": track %d, head %d, sector %d, size %d",
1344 R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1345 } /* tell_sector */
1347 static void print_errors(void)
1349 DPRINT("");
1350 if (ST0 & ST0_ECE) {
1351 pr_cont("Recalibrate failed!");
1352 } else if (ST2 & ST2_CRC) {
1353 pr_cont("data CRC error");
1354 tell_sector();
1355 } else if (ST1 & ST1_CRC) {
1356 pr_cont("CRC error");
1357 tell_sector();
1358 } else if ((ST1 & (ST1_MAM | ST1_ND)) ||
1359 (ST2 & ST2_MAM)) {
1360 if (!probing) {
1361 pr_cont("sector not found");
1362 tell_sector();
1363 } else
1364 pr_cont("probe failed...");
1365 } else if (ST2 & ST2_WC) { /* seek error */
1366 pr_cont("wrong cylinder");
1367 } else if (ST2 & ST2_BC) { /* cylinder marked as bad */
1368 pr_cont("bad cylinder");
1369 } else {
1370 pr_cont("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x",
1371 ST0, ST1, ST2);
1372 tell_sector();
1374 pr_cont("\n");
1378 * OK, this error interpreting routine is called after a
1379 * DMA read/write has succeeded
1380 * or failed, so we check the results, and copy any buffers.
1381 * hhb: Added better error reporting.
1382 * ak: Made this into a separate routine.
1384 static int interpret_errors(void)
1386 char bad;
1388 if (inr != 7) {
1389 DPRINT("-- FDC reply error\n");
1390 FDCS->reset = 1;
1391 return 1;
1394 /* check IC to find cause of interrupt */
1395 switch (ST0 & ST0_INTR) {
1396 case 0x40: /* error occurred during command execution */
1397 if (ST1 & ST1_EOC)
1398 return 0; /* occurs with pseudo-DMA */
1399 bad = 1;
1400 if (ST1 & ST1_WP) {
1401 DPRINT("Drive is write protected\n");
1402 clear_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1403 cont->done(0);
1404 bad = 2;
1405 } else if (ST1 & ST1_ND) {
1406 set_bit(FD_NEED_TWADDLE_BIT, &DRS->flags);
1407 } else if (ST1 & ST1_OR) {
1408 if (DP->flags & FTD_MSG)
1409 DPRINT("Over/Underrun - retrying\n");
1410 bad = 0;
1411 } else if (*errors >= DP->max_errors.reporting) {
1412 print_errors();
1414 if (ST2 & ST2_WC || ST2 & ST2_BC)
1415 /* wrong cylinder => recal */
1416 DRS->track = NEED_2_RECAL;
1417 return bad;
1418 case 0x80: /* invalid command given */
1419 DPRINT("Invalid FDC command given!\n");
1420 cont->done(0);
1421 return 2;
1422 case 0xc0:
1423 DPRINT("Abnormal termination caused by polling\n");
1424 cont->error();
1425 return 2;
1426 default: /* (0) Normal command termination */
1427 return 0;
1432 * This routine is called when everything should be correctly set up
1433 * for the transfer (i.e. floppy motor is on, the correct floppy is
1434 * selected, and the head is sitting on the right track).
1436 static void setup_rw_floppy(void)
1438 int i;
1439 int r;
1440 int flags;
1441 int dflags;
1442 unsigned long ready_date;
1443 work_func_t function;
1445 flags = raw_cmd->flags;
1446 if (flags & (FD_RAW_READ | FD_RAW_WRITE))
1447 flags |= FD_RAW_INTR;
1449 if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)) {
1450 ready_date = DRS->spinup_date + DP->spinup;
1451 /* If spinup will take a long time, rerun scandrives
1452 * again just before spinup completion. Beware that
1453 * after scandrives, we must again wait for selection.
1455 if (time_after(ready_date, jiffies + DP->select_delay)) {
1456 ready_date -= DP->select_delay;
1457 function = (work_func_t)floppy_start;
1458 } else
1459 function = (work_func_t)setup_rw_floppy;
1461 /* wait until the floppy is spinning fast enough */
1462 if (fd_wait_for_completion(ready_date, function))
1463 return;
1465 dflags = DRS->flags;
1467 if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1468 setup_DMA();
1470 if (flags & FD_RAW_INTR)
1471 do_floppy = main_command_interrupt;
1473 r = 0;
1474 for (i = 0; i < raw_cmd->cmd_count; i++)
1475 r |= output_byte(raw_cmd->cmd[i]);
1477 debugt(__func__, "rw_command");
1479 if (r) {
1480 cont->error();
1481 reset_fdc();
1482 return;
1485 if (!(flags & FD_RAW_INTR)) {
1486 inr = result();
1487 cont->interrupt();
1488 } else if (flags & FD_RAW_NEED_DISK)
1489 fd_watchdog(NULL);
1492 static int blind_seek;
1495 * This is the routine called after every seek (or recalibrate) interrupt
1496 * from the floppy controller.
1498 static void seek_interrupt(void)
1500 debugt(__func__, "");
1501 if (inr != 2 || (ST0 & 0xF8) != 0x20) {
1502 DPRINT("seek failed\n");
1503 DRS->track = NEED_2_RECAL;
1504 cont->error();
1505 cont->redo();
1506 return;
1508 if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek) {
1509 debug_dcl(DP->flags,
1510 "clearing NEWCHANGE flag because of effective seek\n");
1511 debug_dcl(DP->flags, "jiffies=%lu\n", jiffies);
1512 clear_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1513 /* effective seek */
1514 DRS->select_date = jiffies;
1516 DRS->track = ST1;
1517 floppy_ready();
1520 static void check_wp(void)
1522 if (test_bit(FD_VERIFY_BIT, &DRS->flags)) {
1523 /* check write protection */
1524 output_byte(FD_GETSTATUS);
1525 output_byte(UNIT(current_drive));
1526 if (result() != 1) {
1527 FDCS->reset = 1;
1528 return;
1530 clear_bit(FD_VERIFY_BIT, &DRS->flags);
1531 clear_bit(FD_NEED_TWADDLE_BIT, &DRS->flags);
1532 debug_dcl(DP->flags,
1533 "checking whether disk is write protected\n");
1534 debug_dcl(DP->flags, "wp=%x\n", ST3 & 0x40);
1535 if (!(ST3 & 0x40))
1536 set_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1537 else
1538 clear_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1542 static void seek_floppy(void)
1544 int track;
1546 blind_seek = 0;
1548 debug_dcl(DP->flags, "calling disk change from %s\n", __func__);
1550 if (!test_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags) &&
1551 disk_change(current_drive) && (raw_cmd->flags & FD_RAW_NEED_DISK)) {
1552 /* the media changed flag should be cleared after the seek.
1553 * If it isn't, this means that there is really no disk in
1554 * the drive.
1556 set_bit(FD_DISK_CHANGED_BIT, &DRS->flags);
1557 cont->done(0);
1558 cont->redo();
1559 return;
1561 if (DRS->track <= NEED_1_RECAL) {
1562 recalibrate_floppy();
1563 return;
1564 } else if (test_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags) &&
1565 (raw_cmd->flags & FD_RAW_NEED_DISK) &&
1566 (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) {
1567 /* we seek to clear the media-changed condition. Does anybody
1568 * know a more elegant way, which works on all drives? */
1569 if (raw_cmd->track)
1570 track = raw_cmd->track - 1;
1571 else {
1572 if (DP->flags & FD_SILENT_DCL_CLEAR) {
1573 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
1574 blind_seek = 1;
1575 raw_cmd->flags |= FD_RAW_NEED_SEEK;
1577 track = 1;
1579 } else {
1580 check_wp();
1581 if (raw_cmd->track != DRS->track &&
1582 (raw_cmd->flags & FD_RAW_NEED_SEEK))
1583 track = raw_cmd->track;
1584 else {
1585 setup_rw_floppy();
1586 return;
1590 do_floppy = seek_interrupt;
1591 output_byte(FD_SEEK);
1592 output_byte(UNIT(current_drive));
1593 if (output_byte(track) < 0) {
1594 reset_fdc();
1595 return;
1597 debugt(__func__, "");
1600 static void recal_interrupt(void)
1602 debugt(__func__, "");
1603 if (inr != 2)
1604 FDCS->reset = 1;
1605 else if (ST0 & ST0_ECE) {
1606 switch (DRS->track) {
1607 case NEED_1_RECAL:
1608 debugt(__func__, "need 1 recal");
1609 /* after a second recalibrate, we still haven't
1610 * reached track 0. Probably no drive. Raise an
1611 * error, as failing immediately might upset
1612 * computers possessed by the Devil :-) */
1613 cont->error();
1614 cont->redo();
1615 return;
1616 case NEED_2_RECAL:
1617 debugt(__func__, "need 2 recal");
1618 /* If we already did a recalibrate,
1619 * and we are not at track 0, this
1620 * means we have moved. (The only way
1621 * not to move at recalibration is to
1622 * be already at track 0.) Clear the
1623 * new change flag */
1624 debug_dcl(DP->flags,
1625 "clearing NEWCHANGE flag because of second recalibrate\n");
1627 clear_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1628 DRS->select_date = jiffies;
1629 /* fall through */
1630 default:
1631 debugt(__func__, "default");
1632 /* Recalibrate moves the head by at
1633 * most 80 steps. If after one
1634 * recalibrate we don't have reached
1635 * track 0, this might mean that we
1636 * started beyond track 80. Try
1637 * again. */
1638 DRS->track = NEED_1_RECAL;
1639 break;
1641 } else
1642 DRS->track = ST1;
1643 floppy_ready();
1646 static void print_result(char *message, int inr)
1648 int i;
1650 DPRINT("%s ", message);
1651 if (inr >= 0)
1652 for (i = 0; i < inr; i++)
1653 pr_cont("repl[%d]=%x ", i, reply_buffer[i]);
1654 pr_cont("\n");
1657 /* interrupt handler. Note that this can be called externally on the Sparc */
1658 irqreturn_t floppy_interrupt(int irq, void *dev_id)
1660 int do_print;
1661 unsigned long f;
1662 void (*handler)(void) = do_floppy;
1664 lasthandler = handler;
1665 interruptjiffies = jiffies;
1667 f = claim_dma_lock();
1668 fd_disable_dma();
1669 release_dma_lock(f);
1671 do_floppy = NULL;
1672 if (fdc >= N_FDC || FDCS->address == -1) {
1673 /* we don't even know which FDC is the culprit */
1674 pr_info("DOR0=%x\n", fdc_state[0].dor);
1675 pr_info("floppy interrupt on bizarre fdc %d\n", fdc);
1676 pr_info("handler=%pf\n", handler);
1677 is_alive(__func__, "bizarre fdc");
1678 return IRQ_NONE;
1681 FDCS->reset = 0;
1682 /* We have to clear the reset flag here, because apparently on boxes
1683 * with level triggered interrupts (PS/2, Sparc, ...), it is needed to
1684 * emit SENSEI's to clear the interrupt line. And FDCS->reset blocks the
1685 * emission of the SENSEI's.
1686 * It is OK to emit floppy commands because we are in an interrupt
1687 * handler here, and thus we have to fear no interference of other
1688 * activity.
1691 do_print = !handler && print_unex && initialized;
1693 inr = result();
1694 if (do_print)
1695 print_result("unexpected interrupt", inr);
1696 if (inr == 0) {
1697 int max_sensei = 4;
1698 do {
1699 output_byte(FD_SENSEI);
1700 inr = result();
1701 if (do_print)
1702 print_result("sensei", inr);
1703 max_sensei--;
1704 } while ((ST0 & 0x83) != UNIT(current_drive) &&
1705 inr == 2 && max_sensei);
1707 if (!handler) {
1708 FDCS->reset = 1;
1709 return IRQ_NONE;
1711 schedule_bh(handler);
1712 is_alive(__func__, "normal interrupt end");
1714 /* FIXME! Was it really for us? */
1715 return IRQ_HANDLED;
1718 static void recalibrate_floppy(void)
1720 debugt(__func__, "");
1721 do_floppy = recal_interrupt;
1722 output_byte(FD_RECALIBRATE);
1723 if (output_byte(UNIT(current_drive)) < 0)
1724 reset_fdc();
1728 * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1730 static void reset_interrupt(void)
1732 debugt(__func__, "");
1733 result(); /* get the status ready for set_fdc */
1734 if (FDCS->reset) {
1735 pr_info("reset set in interrupt, calling %pf\n", cont->error);
1736 cont->error(); /* a reset just after a reset. BAD! */
1738 cont->redo();
1742 * reset is done by pulling bit 2 of DOR low for a while (old FDCs),
1743 * or by setting the self clearing bit 7 of STATUS (newer FDCs)
1745 static void reset_fdc(void)
1747 unsigned long flags;
1749 do_floppy = reset_interrupt;
1750 FDCS->reset = 0;
1751 reset_fdc_info(0);
1753 /* Pseudo-DMA may intercept 'reset finished' interrupt. */
1754 /* Irrelevant for systems with true DMA (i386). */
1756 flags = claim_dma_lock();
1757 fd_disable_dma();
1758 release_dma_lock(flags);
1760 if (FDCS->version >= FDC_82072A)
1761 fd_outb(0x80 | (FDCS->dtr & 3), FD_STATUS);
1762 else {
1763 fd_outb(FDCS->dor & ~0x04, FD_DOR);
1764 udelay(FD_RESET_DELAY);
1765 fd_outb(FDCS->dor, FD_DOR);
1769 static void show_floppy(void)
1771 int i;
1773 pr_info("\n");
1774 pr_info("floppy driver state\n");
1775 pr_info("-------------------\n");
1776 pr_info("now=%lu last interrupt=%lu diff=%lu last called handler=%pf\n",
1777 jiffies, interruptjiffies, jiffies - interruptjiffies,
1778 lasthandler);
1780 pr_info("timeout_message=%s\n", timeout_message);
1781 pr_info("last output bytes:\n");
1782 for (i = 0; i < OLOGSIZE; i++)
1783 pr_info("%2x %2x %lu\n",
1784 output_log[(i + output_log_pos) % OLOGSIZE].data,
1785 output_log[(i + output_log_pos) % OLOGSIZE].status,
1786 output_log[(i + output_log_pos) % OLOGSIZE].jiffies);
1787 pr_info("last result at %lu\n", resultjiffies);
1788 pr_info("last redo_fd_request at %lu\n", lastredo);
1789 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1,
1790 reply_buffer, resultsize, true);
1792 pr_info("status=%x\n", fd_inb(FD_STATUS));
1793 pr_info("fdc_busy=%lu\n", fdc_busy);
1794 if (do_floppy)
1795 pr_info("do_floppy=%pf\n", do_floppy);
1796 if (work_pending(&floppy_work))
1797 pr_info("floppy_work.func=%pf\n", floppy_work.func);
1798 if (delayed_work_pending(&fd_timer))
1799 pr_info("delayed work.function=%p expires=%ld\n",
1800 fd_timer.work.func,
1801 fd_timer.timer.expires - jiffies);
1802 if (delayed_work_pending(&fd_timeout))
1803 pr_info("timer_function=%p expires=%ld\n",
1804 fd_timeout.work.func,
1805 fd_timeout.timer.expires - jiffies);
1807 pr_info("cont=%p\n", cont);
1808 pr_info("current_req=%p\n", current_req);
1809 pr_info("command_status=%d\n", command_status);
1810 pr_info("\n");
1813 static void floppy_shutdown(struct work_struct *arg)
1815 unsigned long flags;
1817 if (initialized)
1818 show_floppy();
1819 cancel_activity();
1821 flags = claim_dma_lock();
1822 fd_disable_dma();
1823 release_dma_lock(flags);
1825 /* avoid dma going to a random drive after shutdown */
1827 if (initialized)
1828 DPRINT("floppy timeout called\n");
1829 FDCS->reset = 1;
1830 if (cont) {
1831 cont->done(0);
1832 cont->redo(); /* this will recall reset when needed */
1833 } else {
1834 pr_info("no cont in shutdown!\n");
1835 process_fd_request();
1837 is_alive(__func__, "");
1840 /* start motor, check media-changed condition and write protection */
1841 static int start_motor(void (*function)(void))
1843 int mask;
1844 int data;
1846 mask = 0xfc;
1847 data = UNIT(current_drive);
1848 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)) {
1849 if (!(FDCS->dor & (0x10 << UNIT(current_drive)))) {
1850 set_debugt();
1851 /* no read since this drive is running */
1852 DRS->first_read_date = 0;
1853 /* note motor start time if motor is not yet running */
1854 DRS->spinup_date = jiffies;
1855 data |= (0x10 << UNIT(current_drive));
1857 } else if (FDCS->dor & (0x10 << UNIT(current_drive)))
1858 mask &= ~(0x10 << UNIT(current_drive));
1860 /* starts motor and selects floppy */
1861 del_timer(motor_off_timer + current_drive);
1862 set_dor(fdc, mask, data);
1864 /* wait_for_completion also schedules reset if needed. */
1865 return fd_wait_for_completion(DRS->select_date + DP->select_delay,
1866 (work_func_t)function);
1869 static void floppy_ready(void)
1871 if (FDCS->reset) {
1872 reset_fdc();
1873 return;
1875 if (start_motor(floppy_ready))
1876 return;
1877 if (fdc_dtr())
1878 return;
1880 debug_dcl(DP->flags, "calling disk change from floppy_ready\n");
1881 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
1882 disk_change(current_drive) && !DP->select_delay)
1883 twaddle(); /* this clears the dcl on certain
1884 * drive/controller combinations */
1886 #ifdef fd_chose_dma_mode
1887 if ((raw_cmd->flags & FD_RAW_READ) || (raw_cmd->flags & FD_RAW_WRITE)) {
1888 unsigned long flags = claim_dma_lock();
1889 fd_chose_dma_mode(raw_cmd->kernel_data, raw_cmd->length);
1890 release_dma_lock(flags);
1892 #endif
1894 if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)) {
1895 perpendicular_mode();
1896 fdc_specify(); /* must be done here because of hut, hlt ... */
1897 seek_floppy();
1898 } else {
1899 if ((raw_cmd->flags & FD_RAW_READ) ||
1900 (raw_cmd->flags & FD_RAW_WRITE))
1901 fdc_specify();
1902 setup_rw_floppy();
1906 static void floppy_start(void)
1908 reschedule_timeout(current_reqD, "floppy start");
1910 scandrives();
1911 debug_dcl(DP->flags, "setting NEWCHANGE in floppy_start\n");
1912 set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1913 floppy_ready();
1917 * ========================================================================
1918 * here ends the bottom half. Exported routines are:
1919 * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1920 * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1921 * Initialization also uses output_byte, result, set_dor, floppy_interrupt
1922 * and set_dor.
1923 * ========================================================================
1926 * General purpose continuations.
1927 * ==============================
1930 static void do_wakeup(void)
1932 reschedule_timeout(MAXTIMEOUT, "do wakeup");
1933 cont = NULL;
1934 command_status += 2;
1935 wake_up(&command_done);
1938 static const struct cont_t wakeup_cont = {
1939 .interrupt = empty,
1940 .redo = do_wakeup,
1941 .error = empty,
1942 .done = (done_f)empty
1945 static const struct cont_t intr_cont = {
1946 .interrupt = empty,
1947 .redo = process_fd_request,
1948 .error = empty,
1949 .done = (done_f)empty
1952 static int wait_til_done(void (*handler)(void), bool interruptible)
1954 int ret;
1956 schedule_bh(handler);
1958 if (interruptible)
1959 wait_event_interruptible(command_done, command_status >= 2);
1960 else
1961 wait_event(command_done, command_status >= 2);
1963 if (command_status < 2) {
1964 cancel_activity();
1965 cont = &intr_cont;
1966 reset_fdc();
1967 return -EINTR;
1970 if (FDCS->reset)
1971 command_status = FD_COMMAND_ERROR;
1972 if (command_status == FD_COMMAND_OKAY)
1973 ret = 0;
1974 else
1975 ret = -EIO;
1976 command_status = FD_COMMAND_NONE;
1977 return ret;
1980 static void generic_done(int result)
1982 command_status = result;
1983 cont = &wakeup_cont;
1986 static void generic_success(void)
1988 cont->done(1);
1991 static void generic_failure(void)
1993 cont->done(0);
1996 static void success_and_wakeup(void)
1998 generic_success();
1999 cont->redo();
2003 * formatting and rw support.
2004 * ==========================
2007 static int next_valid_format(void)
2009 int probed_format;
2011 probed_format = DRS->probed_format;
2012 while (1) {
2013 if (probed_format >= 8 || !DP->autodetect[probed_format]) {
2014 DRS->probed_format = 0;
2015 return 1;
2017 if (floppy_type[DP->autodetect[probed_format]].sect) {
2018 DRS->probed_format = probed_format;
2019 return 0;
2021 probed_format++;
2025 static void bad_flp_intr(void)
2027 int err_count;
2029 if (probing) {
2030 DRS->probed_format++;
2031 if (!next_valid_format())
2032 return;
2034 err_count = ++(*errors);
2035 INFBOUND(DRWE->badness, err_count);
2036 if (err_count > DP->max_errors.abort)
2037 cont->done(0);
2038 if (err_count > DP->max_errors.reset)
2039 FDCS->reset = 1;
2040 else if (err_count > DP->max_errors.recal)
2041 DRS->track = NEED_2_RECAL;
2044 static void set_floppy(int drive)
2046 int type = ITYPE(UDRS->fd_device);
2048 if (type)
2049 _floppy = floppy_type + type;
2050 else
2051 _floppy = current_type[drive];
2055 * formatting support.
2056 * ===================
2058 static void format_interrupt(void)
2060 switch (interpret_errors()) {
2061 case 1:
2062 cont->error();
2063 case 2:
2064 break;
2065 case 0:
2066 cont->done(1);
2068 cont->redo();
2071 #define FM_MODE(x, y) ((y) & ~(((x)->rate & 0x80) >> 1))
2072 #define CT(x) ((x) | 0xc0)
2074 static void setup_format_params(int track)
2076 int n;
2077 int il;
2078 int count;
2079 int head_shift;
2080 int track_shift;
2081 struct fparm {
2082 unsigned char track, head, sect, size;
2083 } *here = (struct fparm *)floppy_track_buffer;
2085 raw_cmd = &default_raw_cmd;
2086 raw_cmd->track = track;
2088 raw_cmd->flags = (FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
2089 FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK);
2090 raw_cmd->rate = _floppy->rate & 0x43;
2091 raw_cmd->cmd_count = NR_F;
2092 COMMAND = FM_MODE(_floppy, FD_FORMAT);
2093 DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, format_req.head);
2094 F_SIZECODE = FD_SIZECODE(_floppy);
2095 F_SECT_PER_TRACK = _floppy->sect << 2 >> F_SIZECODE;
2096 F_GAP = _floppy->fmt_gap;
2097 F_FILL = FD_FILL_BYTE;
2099 raw_cmd->kernel_data = floppy_track_buffer;
2100 raw_cmd->length = 4 * F_SECT_PER_TRACK;
2102 /* allow for about 30ms for data transport per track */
2103 head_shift = (F_SECT_PER_TRACK + 5) / 6;
2105 /* a ``cylinder'' is two tracks plus a little stepping time */
2106 track_shift = 2 * head_shift + 3;
2108 /* position of logical sector 1 on this track */
2109 n = (track_shift * format_req.track + head_shift * format_req.head)
2110 % F_SECT_PER_TRACK;
2112 /* determine interleave */
2113 il = 1;
2114 if (_floppy->fmt_gap < 0x22)
2115 il++;
2117 /* initialize field */
2118 for (count = 0; count < F_SECT_PER_TRACK; ++count) {
2119 here[count].track = format_req.track;
2120 here[count].head = format_req.head;
2121 here[count].sect = 0;
2122 here[count].size = F_SIZECODE;
2124 /* place logical sectors */
2125 for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
2126 here[n].sect = count;
2127 n = (n + il) % F_SECT_PER_TRACK;
2128 if (here[n].sect) { /* sector busy, find next free sector */
2129 ++n;
2130 if (n >= F_SECT_PER_TRACK) {
2131 n -= F_SECT_PER_TRACK;
2132 while (here[n].sect)
2133 ++n;
2137 if (_floppy->stretch & FD_SECTBASEMASK) {
2138 for (count = 0; count < F_SECT_PER_TRACK; count++)
2139 here[count].sect += FD_SECTBASE(_floppy) - 1;
2143 static void redo_format(void)
2145 buffer_track = -1;
2146 setup_format_params(format_req.track << STRETCH(_floppy));
2147 floppy_start();
2148 debugt(__func__, "queue format request");
2151 static const struct cont_t format_cont = {
2152 .interrupt = format_interrupt,
2153 .redo = redo_format,
2154 .error = bad_flp_intr,
2155 .done = generic_done
2158 static int do_format(int drive, struct format_descr *tmp_format_req)
2160 int ret;
2162 if (lock_fdc(drive, true))
2163 return -EINTR;
2165 set_floppy(drive);
2166 if (!_floppy ||
2167 _floppy->track > DP->tracks ||
2168 tmp_format_req->track >= _floppy->track ||
2169 tmp_format_req->head >= _floppy->head ||
2170 (_floppy->sect << 2) % (1 << FD_SIZECODE(_floppy)) ||
2171 !_floppy->fmt_gap) {
2172 process_fd_request();
2173 return -EINVAL;
2175 format_req = *tmp_format_req;
2176 format_errors = 0;
2177 cont = &format_cont;
2178 errors = &format_errors;
2179 ret = wait_til_done(redo_format, true);
2180 if (ret == -EINTR)
2181 return -EINTR;
2182 process_fd_request();
2183 return ret;
2187 * Buffer read/write and support
2188 * =============================
2191 static void floppy_end_request(struct request *req, int error)
2193 unsigned int nr_sectors = current_count_sectors;
2194 unsigned int drive = (unsigned long)req->rq_disk->private_data;
2196 /* current_count_sectors can be zero if transfer failed */
2197 if (error)
2198 nr_sectors = blk_rq_cur_sectors(req);
2199 if (__blk_end_request(req, error, nr_sectors << 9))
2200 return;
2202 /* We're done with the request */
2203 floppy_off(drive);
2204 current_req = NULL;
2207 /* new request_done. Can handle physical sectors which are smaller than a
2208 * logical buffer */
2209 static void request_done(int uptodate)
2211 struct request *req = current_req;
2212 struct request_queue *q;
2213 unsigned long flags;
2214 int block;
2215 char msg[sizeof("request done ") + sizeof(int) * 3];
2217 probing = 0;
2218 snprintf(msg, sizeof(msg), "request done %d", uptodate);
2219 reschedule_timeout(MAXTIMEOUT, msg);
2221 if (!req) {
2222 pr_info("floppy.c: no request in request_done\n");
2223 return;
2226 q = req->q;
2228 if (uptodate) {
2229 /* maintain values for invalidation on geometry
2230 * change */
2231 block = current_count_sectors + blk_rq_pos(req);
2232 INFBOUND(DRS->maxblock, block);
2233 if (block > _floppy->sect)
2234 DRS->maxtrack = 1;
2236 /* unlock chained buffers */
2237 spin_lock_irqsave(q->queue_lock, flags);
2238 floppy_end_request(req, 0);
2239 spin_unlock_irqrestore(q->queue_lock, flags);
2240 } else {
2241 if (rq_data_dir(req) == WRITE) {
2242 /* record write error information */
2243 DRWE->write_errors++;
2244 if (DRWE->write_errors == 1) {
2245 DRWE->first_error_sector = blk_rq_pos(req);
2246 DRWE->first_error_generation = DRS->generation;
2248 DRWE->last_error_sector = blk_rq_pos(req);
2249 DRWE->last_error_generation = DRS->generation;
2251 spin_lock_irqsave(q->queue_lock, flags);
2252 floppy_end_request(req, -EIO);
2253 spin_unlock_irqrestore(q->queue_lock, flags);
2257 /* Interrupt handler evaluating the result of the r/w operation */
2258 static void rw_interrupt(void)
2260 int eoc;
2261 int ssize;
2262 int heads;
2263 int nr_sectors;
2265 if (R_HEAD >= 2) {
2266 /* some Toshiba floppy controllers occasionnally seem to
2267 * return bogus interrupts after read/write operations, which
2268 * can be recognized by a bad head number (>= 2) */
2269 return;
2272 if (!DRS->first_read_date)
2273 DRS->first_read_date = jiffies;
2275 nr_sectors = 0;
2276 ssize = DIV_ROUND_UP(1 << SIZECODE, 4);
2278 if (ST1 & ST1_EOC)
2279 eoc = 1;
2280 else
2281 eoc = 0;
2283 if (COMMAND & 0x80)
2284 heads = 2;
2285 else
2286 heads = 1;
2288 nr_sectors = (((R_TRACK - TRACK) * heads +
2289 R_HEAD - HEAD) * SECT_PER_TRACK +
2290 R_SECTOR - SECTOR + eoc) << SIZECODE >> 2;
2292 if (nr_sectors / ssize >
2293 DIV_ROUND_UP(in_sector_offset + current_count_sectors, ssize)) {
2294 DPRINT("long rw: %x instead of %lx\n",
2295 nr_sectors, current_count_sectors);
2296 pr_info("rs=%d s=%d\n", R_SECTOR, SECTOR);
2297 pr_info("rh=%d h=%d\n", R_HEAD, HEAD);
2298 pr_info("rt=%d t=%d\n", R_TRACK, TRACK);
2299 pr_info("heads=%d eoc=%d\n", heads, eoc);
2300 pr_info("spt=%d st=%d ss=%d\n",
2301 SECT_PER_TRACK, fsector_t, ssize);
2302 pr_info("in_sector_offset=%d\n", in_sector_offset);
2305 nr_sectors -= in_sector_offset;
2306 INFBOUND(nr_sectors, 0);
2307 SUPBOUND(current_count_sectors, nr_sectors);
2309 switch (interpret_errors()) {
2310 case 2:
2311 cont->redo();
2312 return;
2313 case 1:
2314 if (!current_count_sectors) {
2315 cont->error();
2316 cont->redo();
2317 return;
2319 break;
2320 case 0:
2321 if (!current_count_sectors) {
2322 cont->redo();
2323 return;
2325 current_type[current_drive] = _floppy;
2326 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2327 break;
2330 if (probing) {
2331 if (DP->flags & FTD_MSG)
2332 DPRINT("Auto-detected floppy type %s in fd%d\n",
2333 _floppy->name, current_drive);
2334 current_type[current_drive] = _floppy;
2335 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2336 probing = 0;
2339 if (CT(COMMAND) != FD_READ ||
2340 raw_cmd->kernel_data == current_req->buffer) {
2341 /* transfer directly from buffer */
2342 cont->done(1);
2343 } else if (CT(COMMAND) == FD_READ) {
2344 buffer_track = raw_cmd->track;
2345 buffer_drive = current_drive;
2346 INFBOUND(buffer_max, nr_sectors + fsector_t);
2348 cont->redo();
2351 /* Compute maximal contiguous buffer size. */
2352 static int buffer_chain_size(void)
2354 struct bio_vec *bv;
2355 int size;
2356 struct req_iterator iter;
2357 char *base;
2359 base = bio_data(current_req->bio);
2360 size = 0;
2362 rq_for_each_segment(bv, current_req, iter) {
2363 if (page_address(bv->bv_page) + bv->bv_offset != base + size)
2364 break;
2366 size += bv->bv_len;
2369 return size >> 9;
2372 /* Compute the maximal transfer size */
2373 static int transfer_size(int ssize, int max_sector, int max_size)
2375 SUPBOUND(max_sector, fsector_t + max_size);
2377 /* alignment */
2378 max_sector -= (max_sector % _floppy->sect) % ssize;
2380 /* transfer size, beginning not aligned */
2381 current_count_sectors = max_sector - fsector_t;
2383 return max_sector;
2387 * Move data from/to the track buffer to/from the buffer cache.
2389 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
2391 int remaining; /* number of transferred 512-byte sectors */
2392 struct bio_vec *bv;
2393 char *buffer;
2394 char *dma_buffer;
2395 int size;
2396 struct req_iterator iter;
2398 max_sector = transfer_size(ssize,
2399 min(max_sector, max_sector_2),
2400 blk_rq_sectors(current_req));
2402 if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2403 buffer_max > fsector_t + blk_rq_sectors(current_req))
2404 current_count_sectors = min_t(int, buffer_max - fsector_t,
2405 blk_rq_sectors(current_req));
2407 remaining = current_count_sectors << 9;
2408 if (remaining > blk_rq_bytes(current_req) && CT(COMMAND) == FD_WRITE) {
2409 DPRINT("in copy buffer\n");
2410 pr_info("current_count_sectors=%ld\n", current_count_sectors);
2411 pr_info("remaining=%d\n", remaining >> 9);
2412 pr_info("current_req->nr_sectors=%u\n",
2413 blk_rq_sectors(current_req));
2414 pr_info("current_req->current_nr_sectors=%u\n",
2415 blk_rq_cur_sectors(current_req));
2416 pr_info("max_sector=%d\n", max_sector);
2417 pr_info("ssize=%d\n", ssize);
2420 buffer_max = max(max_sector, buffer_max);
2422 dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9);
2424 size = blk_rq_cur_bytes(current_req);
2426 rq_for_each_segment(bv, current_req, iter) {
2427 if (!remaining)
2428 break;
2430 size = bv->bv_len;
2431 SUPBOUND(size, remaining);
2433 buffer = page_address(bv->bv_page) + bv->bv_offset;
2434 if (dma_buffer + size >
2435 floppy_track_buffer + (max_buffer_sectors << 10) ||
2436 dma_buffer < floppy_track_buffer) {
2437 DPRINT("buffer overrun in copy buffer %d\n",
2438 (int)((floppy_track_buffer - dma_buffer) >> 9));
2439 pr_info("fsector_t=%d buffer_min=%d\n",
2440 fsector_t, buffer_min);
2441 pr_info("current_count_sectors=%ld\n",
2442 current_count_sectors);
2443 if (CT(COMMAND) == FD_READ)
2444 pr_info("read\n");
2445 if (CT(COMMAND) == FD_WRITE)
2446 pr_info("write\n");
2447 break;
2449 if (((unsigned long)buffer) % 512)
2450 DPRINT("%p buffer not aligned\n", buffer);
2452 if (CT(COMMAND) == FD_READ)
2453 memcpy(buffer, dma_buffer, size);
2454 else
2455 memcpy(dma_buffer, buffer, size);
2457 remaining -= size;
2458 dma_buffer += size;
2460 if (remaining) {
2461 if (remaining > 0)
2462 max_sector -= remaining >> 9;
2463 DPRINT("weirdness: remaining %d\n", remaining >> 9);
2467 /* work around a bug in pseudo DMA
2468 * (on some FDCs) pseudo DMA does not stop when the CPU stops
2469 * sending data. Hence we need a different way to signal the
2470 * transfer length: We use SECT_PER_TRACK. Unfortunately, this
2471 * does not work with MT, hence we can only transfer one head at
2472 * a time
2474 static void virtualdmabug_workaround(void)
2476 int hard_sectors;
2477 int end_sector;
2479 if (CT(COMMAND) == FD_WRITE) {
2480 COMMAND &= ~0x80; /* switch off multiple track mode */
2482 hard_sectors = raw_cmd->length >> (7 + SIZECODE);
2483 end_sector = SECTOR + hard_sectors - 1;
2484 if (end_sector > SECT_PER_TRACK) {
2485 pr_info("too many sectors %d > %d\n",
2486 end_sector, SECT_PER_TRACK);
2487 return;
2489 SECT_PER_TRACK = end_sector;
2490 /* make sure SECT_PER_TRACK
2491 * points to end of transfer */
2496 * Formulate a read/write request.
2497 * this routine decides where to load the data (directly to buffer, or to
2498 * tmp floppy area), how much data to load (the size of the buffer, the whole
2499 * track, or a single sector)
2500 * All floppy_track_buffer handling goes in here. If we ever add track buffer
2501 * allocation on the fly, it should be done here. No other part should need
2502 * modification.
2505 static int make_raw_rw_request(void)
2507 int aligned_sector_t;
2508 int max_sector;
2509 int max_size;
2510 int tracksize;
2511 int ssize;
2513 if (WARN(max_buffer_sectors == 0, "VFS: Block I/O scheduled on unopened device\n"))
2514 return 0;
2516 set_fdc((long)current_req->rq_disk->private_data);
2518 raw_cmd = &default_raw_cmd;
2519 raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK;
2520 raw_cmd->cmd_count = NR_RW;
2521 if (rq_data_dir(current_req) == READ) {
2522 raw_cmd->flags |= FD_RAW_READ;
2523 COMMAND = FM_MODE(_floppy, FD_READ);
2524 } else if (rq_data_dir(current_req) == WRITE) {
2525 raw_cmd->flags |= FD_RAW_WRITE;
2526 COMMAND = FM_MODE(_floppy, FD_WRITE);
2527 } else {
2528 DPRINT("%s: unknown command\n", __func__);
2529 return 0;
2532 max_sector = _floppy->sect * _floppy->head;
2534 TRACK = (int)blk_rq_pos(current_req) / max_sector;
2535 fsector_t = (int)blk_rq_pos(current_req) % max_sector;
2536 if (_floppy->track && TRACK >= _floppy->track) {
2537 if (blk_rq_cur_sectors(current_req) & 1) {
2538 current_count_sectors = 1;
2539 return 1;
2540 } else
2541 return 0;
2543 HEAD = fsector_t / _floppy->sect;
2545 if (((_floppy->stretch & (FD_SWAPSIDES | FD_SECTBASEMASK)) ||
2546 test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags)) &&
2547 fsector_t < _floppy->sect)
2548 max_sector = _floppy->sect;
2550 /* 2M disks have phantom sectors on the first track */
2551 if ((_floppy->rate & FD_2M) && (!TRACK) && (!HEAD)) {
2552 max_sector = 2 * _floppy->sect / 3;
2553 if (fsector_t >= max_sector) {
2554 current_count_sectors =
2555 min_t(int, _floppy->sect - fsector_t,
2556 blk_rq_sectors(current_req));
2557 return 1;
2559 SIZECODE = 2;
2560 } else
2561 SIZECODE = FD_SIZECODE(_floppy);
2562 raw_cmd->rate = _floppy->rate & 0x43;
2563 if ((_floppy->rate & FD_2M) && (TRACK || HEAD) && raw_cmd->rate == 2)
2564 raw_cmd->rate = 1;
2566 if (SIZECODE)
2567 SIZECODE2 = 0xff;
2568 else
2569 SIZECODE2 = 0x80;
2570 raw_cmd->track = TRACK << STRETCH(_floppy);
2571 DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, HEAD);
2572 GAP = _floppy->gap;
2573 ssize = DIV_ROUND_UP(1 << SIZECODE, 4);
2574 SECT_PER_TRACK = _floppy->sect << 2 >> SIZECODE;
2575 SECTOR = ((fsector_t % _floppy->sect) << 2 >> SIZECODE) +
2576 FD_SECTBASE(_floppy);
2578 /* tracksize describes the size which can be filled up with sectors
2579 * of size ssize.
2581 tracksize = _floppy->sect - _floppy->sect % ssize;
2582 if (tracksize < _floppy->sect) {
2583 SECT_PER_TRACK++;
2584 if (tracksize <= fsector_t % _floppy->sect)
2585 SECTOR--;
2587 /* if we are beyond tracksize, fill up using smaller sectors */
2588 while (tracksize <= fsector_t % _floppy->sect) {
2589 while (tracksize + ssize > _floppy->sect) {
2590 SIZECODE--;
2591 ssize >>= 1;
2593 SECTOR++;
2594 SECT_PER_TRACK++;
2595 tracksize += ssize;
2597 max_sector = HEAD * _floppy->sect + tracksize;
2598 } else if (!TRACK && !HEAD && !(_floppy->rate & FD_2M) && probing) {
2599 max_sector = _floppy->sect;
2600 } else if (!HEAD && CT(COMMAND) == FD_WRITE) {
2601 /* for virtual DMA bug workaround */
2602 max_sector = _floppy->sect;
2605 in_sector_offset = (fsector_t % _floppy->sect) % ssize;
2606 aligned_sector_t = fsector_t - in_sector_offset;
2607 max_size = blk_rq_sectors(current_req);
2608 if ((raw_cmd->track == buffer_track) &&
2609 (current_drive == buffer_drive) &&
2610 (fsector_t >= buffer_min) && (fsector_t < buffer_max)) {
2611 /* data already in track buffer */
2612 if (CT(COMMAND) == FD_READ) {
2613 copy_buffer(1, max_sector, buffer_max);
2614 return 1;
2616 } else if (in_sector_offset || blk_rq_sectors(current_req) < ssize) {
2617 if (CT(COMMAND) == FD_WRITE) {
2618 unsigned int sectors;
2620 sectors = fsector_t + blk_rq_sectors(current_req);
2621 if (sectors > ssize && sectors < ssize + ssize)
2622 max_size = ssize + ssize;
2623 else
2624 max_size = ssize;
2626 raw_cmd->flags &= ~FD_RAW_WRITE;
2627 raw_cmd->flags |= FD_RAW_READ;
2628 COMMAND = FM_MODE(_floppy, FD_READ);
2629 } else if ((unsigned long)current_req->buffer < MAX_DMA_ADDRESS) {
2630 unsigned long dma_limit;
2631 int direct, indirect;
2633 indirect =
2634 transfer_size(ssize, max_sector,
2635 max_buffer_sectors * 2) - fsector_t;
2638 * Do NOT use minimum() here---MAX_DMA_ADDRESS is 64 bits wide
2639 * on a 64 bit machine!
2641 max_size = buffer_chain_size();
2642 dma_limit = (MAX_DMA_ADDRESS -
2643 ((unsigned long)current_req->buffer)) >> 9;
2644 if ((unsigned long)max_size > dma_limit)
2645 max_size = dma_limit;
2646 /* 64 kb boundaries */
2647 if (CROSS_64KB(current_req->buffer, max_size << 9))
2648 max_size = (K_64 -
2649 ((unsigned long)current_req->buffer) %
2650 K_64) >> 9;
2651 direct = transfer_size(ssize, max_sector, max_size) - fsector_t;
2653 * We try to read tracks, but if we get too many errors, we
2654 * go back to reading just one sector at a time.
2656 * This means we should be able to read a sector even if there
2657 * are other bad sectors on this track.
2659 if (!direct ||
2660 (indirect * 2 > direct * 3 &&
2661 *errors < DP->max_errors.read_track &&
2662 ((!probing ||
2663 (DP->read_track & (1 << DRS->probed_format)))))) {
2664 max_size = blk_rq_sectors(current_req);
2665 } else {
2666 raw_cmd->kernel_data = current_req->buffer;
2667 raw_cmd->length = current_count_sectors << 9;
2668 if (raw_cmd->length == 0) {
2669 DPRINT("%s: zero dma transfer attempted\n", __func__);
2670 DPRINT("indirect=%d direct=%d fsector_t=%d\n",
2671 indirect, direct, fsector_t);
2672 return 0;
2674 virtualdmabug_workaround();
2675 return 2;
2679 if (CT(COMMAND) == FD_READ)
2680 max_size = max_sector; /* unbounded */
2682 /* claim buffer track if needed */
2683 if (buffer_track != raw_cmd->track || /* bad track */
2684 buffer_drive != current_drive || /* bad drive */
2685 fsector_t > buffer_max ||
2686 fsector_t < buffer_min ||
2687 ((CT(COMMAND) == FD_READ ||
2688 (!in_sector_offset && blk_rq_sectors(current_req) >= ssize)) &&
2689 max_sector > 2 * max_buffer_sectors + buffer_min &&
2690 max_size + fsector_t > 2 * max_buffer_sectors + buffer_min)) {
2691 /* not enough space */
2692 buffer_track = -1;
2693 buffer_drive = current_drive;
2694 buffer_max = buffer_min = aligned_sector_t;
2696 raw_cmd->kernel_data = floppy_track_buffer +
2697 ((aligned_sector_t - buffer_min) << 9);
2699 if (CT(COMMAND) == FD_WRITE) {
2700 /* copy write buffer to track buffer.
2701 * if we get here, we know that the write
2702 * is either aligned or the data already in the buffer
2703 * (buffer will be overwritten) */
2704 if (in_sector_offset && buffer_track == -1)
2705 DPRINT("internal error offset !=0 on write\n");
2706 buffer_track = raw_cmd->track;
2707 buffer_drive = current_drive;
2708 copy_buffer(ssize, max_sector,
2709 2 * max_buffer_sectors + buffer_min);
2710 } else
2711 transfer_size(ssize, max_sector,
2712 2 * max_buffer_sectors + buffer_min -
2713 aligned_sector_t);
2715 /* round up current_count_sectors to get dma xfer size */
2716 raw_cmd->length = in_sector_offset + current_count_sectors;
2717 raw_cmd->length = ((raw_cmd->length - 1) | (ssize - 1)) + 1;
2718 raw_cmd->length <<= 9;
2719 if ((raw_cmd->length < current_count_sectors << 9) ||
2720 (raw_cmd->kernel_data != current_req->buffer &&
2721 CT(COMMAND) == FD_WRITE &&
2722 (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
2723 aligned_sector_t < buffer_min)) ||
2724 raw_cmd->length % (128 << SIZECODE) ||
2725 raw_cmd->length <= 0 || current_count_sectors <= 0) {
2726 DPRINT("fractionary current count b=%lx s=%lx\n",
2727 raw_cmd->length, current_count_sectors);
2728 if (raw_cmd->kernel_data != current_req->buffer)
2729 pr_info("addr=%d, length=%ld\n",
2730 (int)((raw_cmd->kernel_data -
2731 floppy_track_buffer) >> 9),
2732 current_count_sectors);
2733 pr_info("st=%d ast=%d mse=%d msi=%d\n",
2734 fsector_t, aligned_sector_t, max_sector, max_size);
2735 pr_info("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2736 pr_info("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2737 COMMAND, SECTOR, HEAD, TRACK);
2738 pr_info("buffer drive=%d\n", buffer_drive);
2739 pr_info("buffer track=%d\n", buffer_track);
2740 pr_info("buffer_min=%d\n", buffer_min);
2741 pr_info("buffer_max=%d\n", buffer_max);
2742 return 0;
2745 if (raw_cmd->kernel_data != current_req->buffer) {
2746 if (raw_cmd->kernel_data < floppy_track_buffer ||
2747 current_count_sectors < 0 ||
2748 raw_cmd->length < 0 ||
2749 raw_cmd->kernel_data + raw_cmd->length >
2750 floppy_track_buffer + (max_buffer_sectors << 10)) {
2751 DPRINT("buffer overrun in schedule dma\n");
2752 pr_info("fsector_t=%d buffer_min=%d current_count=%ld\n",
2753 fsector_t, buffer_min, raw_cmd->length >> 9);
2754 pr_info("current_count_sectors=%ld\n",
2755 current_count_sectors);
2756 if (CT(COMMAND) == FD_READ)
2757 pr_info("read\n");
2758 if (CT(COMMAND) == FD_WRITE)
2759 pr_info("write\n");
2760 return 0;
2762 } else if (raw_cmd->length > blk_rq_bytes(current_req) ||
2763 current_count_sectors > blk_rq_sectors(current_req)) {
2764 DPRINT("buffer overrun in direct transfer\n");
2765 return 0;
2766 } else if (raw_cmd->length < current_count_sectors << 9) {
2767 DPRINT("more sectors than bytes\n");
2768 pr_info("bytes=%ld\n", raw_cmd->length >> 9);
2769 pr_info("sectors=%ld\n", current_count_sectors);
2771 if (raw_cmd->length == 0) {
2772 DPRINT("zero dma transfer attempted from make_raw_request\n");
2773 return 0;
2776 virtualdmabug_workaround();
2777 return 2;
2781 * Round-robin between our available drives, doing one request from each
2783 static int set_next_request(void)
2785 struct request_queue *q;
2786 int old_pos = fdc_queue;
2788 do {
2789 q = disks[fdc_queue]->queue;
2790 if (++fdc_queue == N_DRIVE)
2791 fdc_queue = 0;
2792 if (q) {
2793 current_req = blk_fetch_request(q);
2794 if (current_req)
2795 break;
2797 } while (fdc_queue != old_pos);
2799 return current_req != NULL;
2802 static void redo_fd_request(void)
2804 int drive;
2805 int tmp;
2807 lastredo = jiffies;
2808 if (current_drive < N_DRIVE)
2809 floppy_off(current_drive);
2811 do_request:
2812 if (!current_req) {
2813 int pending;
2815 spin_lock_irq(&floppy_lock);
2816 pending = set_next_request();
2817 spin_unlock_irq(&floppy_lock);
2818 if (!pending) {
2819 do_floppy = NULL;
2820 unlock_fdc();
2821 return;
2824 drive = (long)current_req->rq_disk->private_data;
2825 set_fdc(drive);
2826 reschedule_timeout(current_reqD, "redo fd request");
2828 set_floppy(drive);
2829 raw_cmd = &default_raw_cmd;
2830 raw_cmd->flags = 0;
2831 if (start_motor(redo_fd_request))
2832 return;
2834 disk_change(current_drive);
2835 if (test_bit(current_drive, &fake_change) ||
2836 test_bit(FD_DISK_CHANGED_BIT, &DRS->flags)) {
2837 DPRINT("disk absent or changed during operation\n");
2838 request_done(0);
2839 goto do_request;
2841 if (!_floppy) { /* Autodetection */
2842 if (!probing) {
2843 DRS->probed_format = 0;
2844 if (next_valid_format()) {
2845 DPRINT("no autodetectable formats\n");
2846 _floppy = NULL;
2847 request_done(0);
2848 goto do_request;
2851 probing = 1;
2852 _floppy = floppy_type + DP->autodetect[DRS->probed_format];
2853 } else
2854 probing = 0;
2855 errors = &(current_req->errors);
2856 tmp = make_raw_rw_request();
2857 if (tmp < 2) {
2858 request_done(tmp);
2859 goto do_request;
2862 if (test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags))
2863 twaddle();
2864 schedule_bh(floppy_start);
2865 debugt(__func__, "queue fd request");
2866 return;
2869 static const struct cont_t rw_cont = {
2870 .interrupt = rw_interrupt,
2871 .redo = redo_fd_request,
2872 .error = bad_flp_intr,
2873 .done = request_done
2876 static void process_fd_request(void)
2878 cont = &rw_cont;
2879 schedule_bh(redo_fd_request);
2882 static void do_fd_request(struct request_queue *q)
2884 if (WARN(max_buffer_sectors == 0,
2885 "VFS: %s called on non-open device\n", __func__))
2886 return;
2888 if (WARN(atomic_read(&usage_count) == 0,
2889 "warning: usage count=0, current_req=%p sect=%ld type=%x flags=%x\n",
2890 current_req, (long)blk_rq_pos(current_req), current_req->cmd_type,
2891 current_req->cmd_flags))
2892 return;
2894 if (test_and_set_bit(0, &fdc_busy)) {
2895 /* fdc busy, this new request will be treated when the
2896 current one is done */
2897 is_alive(__func__, "old request running");
2898 return;
2900 command_status = FD_COMMAND_NONE;
2901 __reschedule_timeout(MAXTIMEOUT, "fd_request");
2902 set_fdc(0);
2903 process_fd_request();
2904 is_alive(__func__, "");
2907 static const struct cont_t poll_cont = {
2908 .interrupt = success_and_wakeup,
2909 .redo = floppy_ready,
2910 .error = generic_failure,
2911 .done = generic_done
2914 static int poll_drive(bool interruptible, int flag)
2916 /* no auto-sense, just clear dcl */
2917 raw_cmd = &default_raw_cmd;
2918 raw_cmd->flags = flag;
2919 raw_cmd->track = 0;
2920 raw_cmd->cmd_count = 0;
2921 cont = &poll_cont;
2922 debug_dcl(DP->flags, "setting NEWCHANGE in poll_drive\n");
2923 set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
2925 return wait_til_done(floppy_ready, interruptible);
2929 * User triggered reset
2930 * ====================
2933 static void reset_intr(void)
2935 pr_info("weird, reset interrupt called\n");
2938 static const struct cont_t reset_cont = {
2939 .interrupt = reset_intr,
2940 .redo = success_and_wakeup,
2941 .error = generic_failure,
2942 .done = generic_done
2945 static int user_reset_fdc(int drive, int arg, bool interruptible)
2947 int ret;
2949 if (lock_fdc(drive, interruptible))
2950 return -EINTR;
2952 if (arg == FD_RESET_ALWAYS)
2953 FDCS->reset = 1;
2954 if (FDCS->reset) {
2955 cont = &reset_cont;
2956 ret = wait_til_done(reset_fdc, interruptible);
2957 if (ret == -EINTR)
2958 return -EINTR;
2960 process_fd_request();
2961 return 0;
2965 * Misc Ioctl's and support
2966 * ========================
2968 static inline int fd_copyout(void __user *param, const void *address,
2969 unsigned long size)
2971 return copy_to_user(param, address, size) ? -EFAULT : 0;
2974 static inline int fd_copyin(void __user *param, void *address,
2975 unsigned long size)
2977 return copy_from_user(address, param, size) ? -EFAULT : 0;
2980 static const char *drive_name(int type, int drive)
2982 struct floppy_struct *floppy;
2984 if (type)
2985 floppy = floppy_type + type;
2986 else {
2987 if (UDP->native_format)
2988 floppy = floppy_type + UDP->native_format;
2989 else
2990 return "(null)";
2992 if (floppy->name)
2993 return floppy->name;
2994 else
2995 return "(null)";
2998 /* raw commands */
2999 static void raw_cmd_done(int flag)
3001 int i;
3003 if (!flag) {
3004 raw_cmd->flags |= FD_RAW_FAILURE;
3005 raw_cmd->flags |= FD_RAW_HARDFAILURE;
3006 } else {
3007 raw_cmd->reply_count = inr;
3008 if (raw_cmd->reply_count > MAX_REPLIES)
3009 raw_cmd->reply_count = 0;
3010 for (i = 0; i < raw_cmd->reply_count; i++)
3011 raw_cmd->reply[i] = reply_buffer[i];
3013 if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3014 unsigned long flags;
3015 flags = claim_dma_lock();
3016 raw_cmd->length = fd_get_dma_residue();
3017 release_dma_lock(flags);
3020 if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
3021 (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
3022 raw_cmd->flags |= FD_RAW_FAILURE;
3024 if (disk_change(current_drive))
3025 raw_cmd->flags |= FD_RAW_DISK_CHANGE;
3026 else
3027 raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
3028 if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
3029 motor_off_callback(current_drive);
3031 if (raw_cmd->next &&
3032 (!(raw_cmd->flags & FD_RAW_FAILURE) ||
3033 !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
3034 ((raw_cmd->flags & FD_RAW_FAILURE) ||
3035 !(raw_cmd->flags & FD_RAW_STOP_IF_SUCCESS))) {
3036 raw_cmd = raw_cmd->next;
3037 return;
3040 generic_done(flag);
3043 static const struct cont_t raw_cmd_cont = {
3044 .interrupt = success_and_wakeup,
3045 .redo = floppy_start,
3046 .error = generic_failure,
3047 .done = raw_cmd_done
3050 static int raw_cmd_copyout(int cmd, void __user *param,
3051 struct floppy_raw_cmd *ptr)
3053 int ret;
3055 while (ptr) {
3056 struct floppy_raw_cmd cmd = *ptr;
3057 cmd.next = NULL;
3058 cmd.kernel_data = NULL;
3059 ret = copy_to_user(param, &cmd, sizeof(cmd));
3060 if (ret)
3061 return -EFAULT;
3062 param += sizeof(struct floppy_raw_cmd);
3063 if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) {
3064 if (ptr->length >= 0 &&
3065 ptr->length <= ptr->buffer_length) {
3066 long length = ptr->buffer_length - ptr->length;
3067 ret = fd_copyout(ptr->data, ptr->kernel_data,
3068 length);
3069 if (ret)
3070 return ret;
3073 ptr = ptr->next;
3076 return 0;
3079 static void raw_cmd_free(struct floppy_raw_cmd **ptr)
3081 struct floppy_raw_cmd *next;
3082 struct floppy_raw_cmd *this;
3084 this = *ptr;
3085 *ptr = NULL;
3086 while (this) {
3087 if (this->buffer_length) {
3088 fd_dma_mem_free((unsigned long)this->kernel_data,
3089 this->buffer_length);
3090 this->buffer_length = 0;
3092 next = this->next;
3093 kfree(this);
3094 this = next;
3098 static int raw_cmd_copyin(int cmd, void __user *param,
3099 struct floppy_raw_cmd **rcmd)
3101 struct floppy_raw_cmd *ptr;
3102 int ret;
3103 int i;
3105 *rcmd = NULL;
3107 loop:
3108 ptr = kmalloc(sizeof(struct floppy_raw_cmd), GFP_USER);
3109 if (!ptr)
3110 return -ENOMEM;
3111 *rcmd = ptr;
3112 ret = copy_from_user(ptr, param, sizeof(*ptr));
3113 ptr->next = NULL;
3114 ptr->buffer_length = 0;
3115 ptr->kernel_data = NULL;
3116 if (ret)
3117 return -EFAULT;
3118 param += sizeof(struct floppy_raw_cmd);
3119 if (ptr->cmd_count > 33)
3120 /* the command may now also take up the space
3121 * initially intended for the reply & the
3122 * reply count. Needed for long 82078 commands
3123 * such as RESTORE, which takes ... 17 command
3124 * bytes. Murphy's law #137: When you reserve
3125 * 16 bytes for a structure, you'll one day
3126 * discover that you really need 17...
3128 return -EINVAL;
3130 for (i = 0; i < 16; i++)
3131 ptr->reply[i] = 0;
3132 ptr->resultcode = 0;
3134 if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3135 if (ptr->length <= 0)
3136 return -EINVAL;
3137 ptr->kernel_data = (char *)fd_dma_mem_alloc(ptr->length);
3138 fallback_on_nodma_alloc(&ptr->kernel_data, ptr->length);
3139 if (!ptr->kernel_data)
3140 return -ENOMEM;
3141 ptr->buffer_length = ptr->length;
3143 if (ptr->flags & FD_RAW_WRITE) {
3144 ret = fd_copyin(ptr->data, ptr->kernel_data, ptr->length);
3145 if (ret)
3146 return ret;
3149 if (ptr->flags & FD_RAW_MORE) {
3150 rcmd = &(ptr->next);
3151 ptr->rate &= 0x43;
3152 goto loop;
3155 return 0;
3158 static int raw_cmd_ioctl(int cmd, void __user *param)
3160 struct floppy_raw_cmd *my_raw_cmd;
3161 int drive;
3162 int ret2;
3163 int ret;
3165 if (FDCS->rawcmd <= 1)
3166 FDCS->rawcmd = 1;
3167 for (drive = 0; drive < N_DRIVE; drive++) {
3168 if (FDC(drive) != fdc)
3169 continue;
3170 if (drive == current_drive) {
3171 if (UDRS->fd_ref > 1) {
3172 FDCS->rawcmd = 2;
3173 break;
3175 } else if (UDRS->fd_ref) {
3176 FDCS->rawcmd = 2;
3177 break;
3181 if (FDCS->reset)
3182 return -EIO;
3184 ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
3185 if (ret) {
3186 raw_cmd_free(&my_raw_cmd);
3187 return ret;
3190 raw_cmd = my_raw_cmd;
3191 cont = &raw_cmd_cont;
3192 ret = wait_til_done(floppy_start, true);
3193 debug_dcl(DP->flags, "calling disk change from raw_cmd ioctl\n");
3195 if (ret != -EINTR && FDCS->reset)
3196 ret = -EIO;
3198 DRS->track = NO_TRACK;
3200 ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
3201 if (!ret)
3202 ret = ret2;
3203 raw_cmd_free(&my_raw_cmd);
3204 return ret;
3207 static int invalidate_drive(struct block_device *bdev)
3209 /* invalidate the buffer track to force a reread */
3210 set_bit((long)bdev->bd_disk->private_data, &fake_change);
3211 process_fd_request();
3212 check_disk_change(bdev);
3213 return 0;
3216 static int set_geometry(unsigned int cmd, struct floppy_struct *g,
3217 int drive, int type, struct block_device *bdev)
3219 int cnt;
3221 /* sanity checking for parameters. */
3222 if (g->sect <= 0 ||
3223 g->head <= 0 ||
3224 g->track <= 0 || g->track > UDP->tracks >> STRETCH(g) ||
3225 /* check if reserved bits are set */
3226 (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_SECTBASEMASK)) != 0)
3227 return -EINVAL;
3228 if (type) {
3229 if (!capable(CAP_SYS_ADMIN))
3230 return -EPERM;
3231 mutex_lock(&open_lock);
3232 if (lock_fdc(drive, true)) {
3233 mutex_unlock(&open_lock);
3234 return -EINTR;
3236 floppy_type[type] = *g;
3237 floppy_type[type].name = "user format";
3238 for (cnt = type << 2; cnt < (type << 2) + 4; cnt++)
3239 floppy_sizes[cnt] = floppy_sizes[cnt + 0x80] =
3240 floppy_type[type].size + 1;
3241 process_fd_request();
3242 for (cnt = 0; cnt < N_DRIVE; cnt++) {
3243 struct block_device *bdev = opened_bdev[cnt];
3244 if (!bdev || ITYPE(drive_state[cnt].fd_device) != type)
3245 continue;
3246 __invalidate_device(bdev, true);
3248 mutex_unlock(&open_lock);
3249 } else {
3250 int oldStretch;
3252 if (lock_fdc(drive, true))
3253 return -EINTR;
3254 if (cmd != FDDEFPRM) {
3255 /* notice a disk change immediately, else
3256 * we lose our settings immediately*/
3257 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3258 return -EINTR;
3260 oldStretch = g->stretch;
3261 user_params[drive] = *g;
3262 if (buffer_drive == drive)
3263 SUPBOUND(buffer_max, user_params[drive].sect);
3264 current_type[drive] = &user_params[drive];
3265 floppy_sizes[drive] = user_params[drive].size;
3266 if (cmd == FDDEFPRM)
3267 DRS->keep_data = -1;
3268 else
3269 DRS->keep_data = 1;
3270 /* invalidation. Invalidate only when needed, i.e.
3271 * when there are already sectors in the buffer cache
3272 * whose number will change. This is useful, because
3273 * mtools often changes the geometry of the disk after
3274 * looking at the boot block */
3275 if (DRS->maxblock > user_params[drive].sect ||
3276 DRS->maxtrack ||
3277 ((user_params[drive].sect ^ oldStretch) &
3278 (FD_SWAPSIDES | FD_SECTBASEMASK)))
3279 invalidate_drive(bdev);
3280 else
3281 process_fd_request();
3283 return 0;
3286 /* handle obsolete ioctl's */
3287 static unsigned int ioctl_table[] = {
3288 FDCLRPRM,
3289 FDSETPRM,
3290 FDDEFPRM,
3291 FDGETPRM,
3292 FDMSGON,
3293 FDMSGOFF,
3294 FDFMTBEG,
3295 FDFMTTRK,
3296 FDFMTEND,
3297 FDSETEMSGTRESH,
3298 FDFLUSH,
3299 FDSETMAXERRS,
3300 FDGETMAXERRS,
3301 FDGETDRVTYP,
3302 FDSETDRVPRM,
3303 FDGETDRVPRM,
3304 FDGETDRVSTAT,
3305 FDPOLLDRVSTAT,
3306 FDRESET,
3307 FDGETFDCSTAT,
3308 FDWERRORCLR,
3309 FDWERRORGET,
3310 FDRAWCMD,
3311 FDEJECT,
3312 FDTWADDLE
3315 static int normalize_ioctl(unsigned int *cmd, int *size)
3317 int i;
3319 for (i = 0; i < ARRAY_SIZE(ioctl_table); i++) {
3320 if ((*cmd & 0xffff) == (ioctl_table[i] & 0xffff)) {
3321 *size = _IOC_SIZE(*cmd);
3322 *cmd = ioctl_table[i];
3323 if (*size > _IOC_SIZE(*cmd)) {
3324 pr_info("ioctl not yet supported\n");
3325 return -EFAULT;
3327 return 0;
3330 return -EINVAL;
3333 static int get_floppy_geometry(int drive, int type, struct floppy_struct **g)
3335 if (type)
3336 *g = &floppy_type[type];
3337 else {
3338 if (lock_fdc(drive, false))
3339 return -EINTR;
3340 if (poll_drive(false, 0) == -EINTR)
3341 return -EINTR;
3342 process_fd_request();
3343 *g = current_type[drive];
3345 if (!*g)
3346 return -ENODEV;
3347 return 0;
3350 static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3352 int drive = (long)bdev->bd_disk->private_data;
3353 int type = ITYPE(drive_state[drive].fd_device);
3354 struct floppy_struct *g;
3355 int ret;
3357 ret = get_floppy_geometry(drive, type, &g);
3358 if (ret)
3359 return ret;
3361 geo->heads = g->head;
3362 geo->sectors = g->sect;
3363 geo->cylinders = g->track;
3364 return 0;
3367 static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
3368 unsigned long param)
3370 int drive = (long)bdev->bd_disk->private_data;
3371 int type = ITYPE(UDRS->fd_device);
3372 int i;
3373 int ret;
3374 int size;
3375 union inparam {
3376 struct floppy_struct g; /* geometry */
3377 struct format_descr f;
3378 struct floppy_max_errors max_errors;
3379 struct floppy_drive_params dp;
3380 } inparam; /* parameters coming from user space */
3381 const void *outparam; /* parameters passed back to user space */
3383 /* convert compatibility eject ioctls into floppy eject ioctl.
3384 * We do this in order to provide a means to eject floppy disks before
3385 * installing the new fdutils package */
3386 if (cmd == CDROMEJECT || /* CD-ROM eject */
3387 cmd == 0x6470) { /* SunOS floppy eject */
3388 DPRINT("obsolete eject ioctl\n");
3389 DPRINT("please use floppycontrol --eject\n");
3390 cmd = FDEJECT;
3393 if (!((cmd & 0xff00) == 0x0200))
3394 return -EINVAL;
3396 /* convert the old style command into a new style command */
3397 ret = normalize_ioctl(&cmd, &size);
3398 if (ret)
3399 return ret;
3401 /* permission checks */
3402 if (((cmd & 0x40) && !(mode & (FMODE_WRITE | FMODE_WRITE_IOCTL))) ||
3403 ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)))
3404 return -EPERM;
3406 if (WARN_ON(size < 0 || size > sizeof(inparam)))
3407 return -EINVAL;
3409 /* copyin */
3410 memset(&inparam, 0, sizeof(inparam));
3411 if (_IOC_DIR(cmd) & _IOC_WRITE) {
3412 ret = fd_copyin((void __user *)param, &inparam, size);
3413 if (ret)
3414 return ret;
3417 switch (cmd) {
3418 case FDEJECT:
3419 if (UDRS->fd_ref != 1)
3420 /* somebody else has this drive open */
3421 return -EBUSY;
3422 if (lock_fdc(drive, true))
3423 return -EINTR;
3425 /* do the actual eject. Fails on
3426 * non-Sparc architectures */
3427 ret = fd_eject(UNIT(drive));
3429 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
3430 set_bit(FD_VERIFY_BIT, &UDRS->flags);
3431 process_fd_request();
3432 return ret;
3433 case FDCLRPRM:
3434 if (lock_fdc(drive, true))
3435 return -EINTR;
3436 current_type[drive] = NULL;
3437 floppy_sizes[drive] = MAX_DISK_SIZE << 1;
3438 UDRS->keep_data = 0;
3439 return invalidate_drive(bdev);
3440 case FDSETPRM:
3441 case FDDEFPRM:
3442 return set_geometry(cmd, &inparam.g, drive, type, bdev);
3443 case FDGETPRM:
3444 ret = get_floppy_geometry(drive, type,
3445 (struct floppy_struct **)&outparam);
3446 if (ret)
3447 return ret;
3448 break;
3449 case FDMSGON:
3450 UDP->flags |= FTD_MSG;
3451 return 0;
3452 case FDMSGOFF:
3453 UDP->flags &= ~FTD_MSG;
3454 return 0;
3455 case FDFMTBEG:
3456 if (lock_fdc(drive, true))
3457 return -EINTR;
3458 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3459 return -EINTR;
3460 ret = UDRS->flags;
3461 process_fd_request();
3462 if (ret & FD_VERIFY)
3463 return -ENODEV;
3464 if (!(ret & FD_DISK_WRITABLE))
3465 return -EROFS;
3466 return 0;
3467 case FDFMTTRK:
3468 if (UDRS->fd_ref != 1)
3469 return -EBUSY;
3470 return do_format(drive, &inparam.f);
3471 case FDFMTEND:
3472 case FDFLUSH:
3473 if (lock_fdc(drive, true))
3474 return -EINTR;
3475 return invalidate_drive(bdev);
3476 case FDSETEMSGTRESH:
3477 UDP->max_errors.reporting = (unsigned short)(param & 0x0f);
3478 return 0;
3479 case FDGETMAXERRS:
3480 outparam = &UDP->max_errors;
3481 break;
3482 case FDSETMAXERRS:
3483 UDP->max_errors = inparam.max_errors;
3484 break;
3485 case FDGETDRVTYP:
3486 outparam = drive_name(type, drive);
3487 SUPBOUND(size, strlen((const char *)outparam) + 1);
3488 break;
3489 case FDSETDRVPRM:
3490 *UDP = inparam.dp;
3491 break;
3492 case FDGETDRVPRM:
3493 outparam = UDP;
3494 break;
3495 case FDPOLLDRVSTAT:
3496 if (lock_fdc(drive, true))
3497 return -EINTR;
3498 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3499 return -EINTR;
3500 process_fd_request();
3501 /* fall through */
3502 case FDGETDRVSTAT:
3503 outparam = UDRS;
3504 break;
3505 case FDRESET:
3506 return user_reset_fdc(drive, (int)param, true);
3507 case FDGETFDCSTAT:
3508 outparam = UFDCS;
3509 break;
3510 case FDWERRORCLR:
3511 memset(UDRWE, 0, sizeof(*UDRWE));
3512 return 0;
3513 case FDWERRORGET:
3514 outparam = UDRWE;
3515 break;
3516 case FDRAWCMD:
3517 if (type)
3518 return -EINVAL;
3519 if (lock_fdc(drive, true))
3520 return -EINTR;
3521 set_floppy(drive);
3522 i = raw_cmd_ioctl(cmd, (void __user *)param);
3523 if (i == -EINTR)
3524 return -EINTR;
3525 process_fd_request();
3526 return i;
3527 case FDTWADDLE:
3528 if (lock_fdc(drive, true))
3529 return -EINTR;
3530 twaddle();
3531 process_fd_request();
3532 return 0;
3533 default:
3534 return -EINVAL;
3537 if (_IOC_DIR(cmd) & _IOC_READ)
3538 return fd_copyout((void __user *)param, outparam, size);
3540 return 0;
3543 static int fd_ioctl(struct block_device *bdev, fmode_t mode,
3544 unsigned int cmd, unsigned long param)
3546 int ret;
3548 mutex_lock(&floppy_mutex);
3549 ret = fd_locked_ioctl(bdev, mode, cmd, param);
3550 mutex_unlock(&floppy_mutex);
3552 return ret;
3555 static void __init config_types(void)
3557 bool has_drive = false;
3558 int drive;
3560 /* read drive info out of physical CMOS */
3561 drive = 0;
3562 if (!UDP->cmos)
3563 UDP->cmos = FLOPPY0_TYPE;
3564 drive = 1;
3565 if (!UDP->cmos && FLOPPY1_TYPE)
3566 UDP->cmos = FLOPPY1_TYPE;
3568 /* FIXME: additional physical CMOS drive detection should go here */
3570 for (drive = 0; drive < N_DRIVE; drive++) {
3571 unsigned int type = UDP->cmos;
3572 struct floppy_drive_params *params;
3573 const char *name = NULL;
3574 static char temparea[32];
3576 if (type < ARRAY_SIZE(default_drive_params)) {
3577 params = &default_drive_params[type].params;
3578 if (type) {
3579 name = default_drive_params[type].name;
3580 allowed_drive_mask |= 1 << drive;
3581 } else
3582 allowed_drive_mask &= ~(1 << drive);
3583 } else {
3584 params = &default_drive_params[0].params;
3585 sprintf(temparea, "unknown type %d (usb?)", type);
3586 name = temparea;
3588 if (name) {
3589 const char *prepend;
3590 if (!has_drive) {
3591 prepend = "";
3592 has_drive = true;
3593 pr_info("Floppy drive(s):");
3594 } else {
3595 prepend = ",";
3598 pr_cont("%s fd%d is %s", prepend, drive, name);
3600 *UDP = *params;
3603 if (has_drive)
3604 pr_cont("\n");
3607 static void floppy_release(struct gendisk *disk, fmode_t mode)
3609 int drive = (long)disk->private_data;
3611 mutex_lock(&floppy_mutex);
3612 mutex_lock(&open_lock);
3613 if (!UDRS->fd_ref--) {
3614 DPRINT("floppy_release with fd_ref == 0");
3615 UDRS->fd_ref = 0;
3617 if (!UDRS->fd_ref)
3618 opened_bdev[drive] = NULL;
3619 mutex_unlock(&open_lock);
3620 mutex_unlock(&floppy_mutex);
3624 * floppy_open check for aliasing (/dev/fd0 can be the same as
3625 * /dev/PS0 etc), and disallows simultaneous access to the same
3626 * drive with different device numbers.
3628 static int floppy_open(struct block_device *bdev, fmode_t mode)
3630 int drive = (long)bdev->bd_disk->private_data;
3631 int old_dev, new_dev;
3632 int try;
3633 int res = -EBUSY;
3634 char *tmp;
3636 mutex_lock(&floppy_mutex);
3637 mutex_lock(&open_lock);
3638 old_dev = UDRS->fd_device;
3639 if (opened_bdev[drive] && opened_bdev[drive] != bdev)
3640 goto out2;
3642 if (!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)) {
3643 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
3644 set_bit(FD_VERIFY_BIT, &UDRS->flags);
3647 UDRS->fd_ref++;
3649 opened_bdev[drive] = bdev;
3651 res = -ENXIO;
3653 if (!floppy_track_buffer) {
3654 /* if opening an ED drive, reserve a big buffer,
3655 * else reserve a small one */
3656 if ((UDP->cmos == 6) || (UDP->cmos == 5))
3657 try = 64; /* Only 48 actually useful */
3658 else
3659 try = 32; /* Only 24 actually useful */
3661 tmp = (char *)fd_dma_mem_alloc(1024 * try);
3662 if (!tmp && !floppy_track_buffer) {
3663 try >>= 1; /* buffer only one side */
3664 INFBOUND(try, 16);
3665 tmp = (char *)fd_dma_mem_alloc(1024 * try);
3667 if (!tmp && !floppy_track_buffer)
3668 fallback_on_nodma_alloc(&tmp, 2048 * try);
3669 if (!tmp && !floppy_track_buffer) {
3670 DPRINT("Unable to allocate DMA memory\n");
3671 goto out;
3673 if (floppy_track_buffer) {
3674 if (tmp)
3675 fd_dma_mem_free((unsigned long)tmp, try * 1024);
3676 } else {
3677 buffer_min = buffer_max = -1;
3678 floppy_track_buffer = tmp;
3679 max_buffer_sectors = try;
3683 new_dev = MINOR(bdev->bd_dev);
3684 UDRS->fd_device = new_dev;
3685 set_capacity(disks[drive], floppy_sizes[new_dev]);
3686 if (old_dev != -1 && old_dev != new_dev) {
3687 if (buffer_drive == drive)
3688 buffer_track = -1;
3691 if (UFDCS->rawcmd == 1)
3692 UFDCS->rawcmd = 2;
3694 if (!(mode & FMODE_NDELAY)) {
3695 if (mode & (FMODE_READ|FMODE_WRITE)) {
3696 UDRS->last_checked = 0;
3697 clear_bit(FD_OPEN_SHOULD_FAIL_BIT, &UDRS->flags);
3698 check_disk_change(bdev);
3699 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags))
3700 goto out;
3701 if (test_bit(FD_OPEN_SHOULD_FAIL_BIT, &UDRS->flags))
3702 goto out;
3704 res = -EROFS;
3705 if ((mode & FMODE_WRITE) &&
3706 !test_bit(FD_DISK_WRITABLE_BIT, &UDRS->flags))
3707 goto out;
3709 mutex_unlock(&open_lock);
3710 mutex_unlock(&floppy_mutex);
3711 return 0;
3712 out:
3713 UDRS->fd_ref--;
3715 if (!UDRS->fd_ref)
3716 opened_bdev[drive] = NULL;
3717 out2:
3718 mutex_unlock(&open_lock);
3719 mutex_unlock(&floppy_mutex);
3720 return res;
3724 * Check if the disk has been changed or if a change has been faked.
3726 static unsigned int floppy_check_events(struct gendisk *disk,
3727 unsigned int clearing)
3729 int drive = (long)disk->private_data;
3731 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
3732 test_bit(FD_VERIFY_BIT, &UDRS->flags))
3733 return DISK_EVENT_MEDIA_CHANGE;
3735 if (time_after(jiffies, UDRS->last_checked + UDP->checkfreq)) {
3736 lock_fdc(drive, false);
3737 poll_drive(false, 0);
3738 process_fd_request();
3741 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
3742 test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
3743 test_bit(drive, &fake_change) ||
3744 drive_no_geom(drive))
3745 return DISK_EVENT_MEDIA_CHANGE;
3746 return 0;
3750 * This implements "read block 0" for floppy_revalidate().
3751 * Needed for format autodetection, checking whether there is
3752 * a disk in the drive, and whether that disk is writable.
3755 struct rb0_cbdata {
3756 int drive;
3757 struct completion complete;
3760 static void floppy_rb0_cb(struct bio *bio, int err)
3762 struct rb0_cbdata *cbdata = (struct rb0_cbdata *)bio->bi_private;
3763 int drive = cbdata->drive;
3765 if (err) {
3766 pr_info("floppy: error %d while reading block 0", err);
3767 set_bit(FD_OPEN_SHOULD_FAIL_BIT, &UDRS->flags);
3769 complete(&cbdata->complete);
3772 static int __floppy_read_block_0(struct block_device *bdev, int drive)
3774 struct bio bio;
3775 struct bio_vec bio_vec;
3776 struct page *page;
3777 struct rb0_cbdata cbdata;
3778 size_t size;
3780 page = alloc_page(GFP_NOIO);
3781 if (!page) {
3782 process_fd_request();
3783 return -ENOMEM;
3786 size = bdev->bd_block_size;
3787 if (!size)
3788 size = 1024;
3790 cbdata.drive = drive;
3792 bio_init(&bio);
3793 bio.bi_io_vec = &bio_vec;
3794 bio_vec.bv_page = page;
3795 bio_vec.bv_len = size;
3796 bio_vec.bv_offset = 0;
3797 bio.bi_vcnt = 1;
3798 bio.bi_size = size;
3799 bio.bi_bdev = bdev;
3800 bio.bi_sector = 0;
3801 bio.bi_flags |= (1 << BIO_QUIET);
3802 bio.bi_private = &cbdata;
3803 bio.bi_end_io = floppy_rb0_cb;
3805 submit_bio(READ, &bio);
3806 process_fd_request();
3808 init_completion(&cbdata.complete);
3809 wait_for_completion(&cbdata.complete);
3811 __free_page(page);
3813 return 0;
3816 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
3817 * the bootblock (block 0). "Autodetection" is also needed to check whether
3818 * there is a disk in the drive at all... Thus we also do it for fixed
3819 * geometry formats */
3820 static int floppy_revalidate(struct gendisk *disk)
3822 int drive = (long)disk->private_data;
3823 int cf;
3824 int res = 0;
3826 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
3827 test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
3828 test_bit(drive, &fake_change) ||
3829 drive_no_geom(drive)) {
3830 if (WARN(atomic_read(&usage_count) == 0,
3831 "VFS: revalidate called on non-open device.\n"))
3832 return -EFAULT;
3834 lock_fdc(drive, false);
3835 cf = (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
3836 test_bit(FD_VERIFY_BIT, &UDRS->flags));
3837 if (!(cf || test_bit(drive, &fake_change) || drive_no_geom(drive))) {
3838 process_fd_request(); /*already done by another thread */
3839 return 0;
3841 UDRS->maxblock = 0;
3842 UDRS->maxtrack = 0;
3843 if (buffer_drive == drive)
3844 buffer_track = -1;
3845 clear_bit(drive, &fake_change);
3846 clear_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
3847 if (cf)
3848 UDRS->generation++;
3849 if (drive_no_geom(drive)) {
3850 /* auto-sensing */
3851 res = __floppy_read_block_0(opened_bdev[drive], drive);
3852 } else {
3853 if (cf)
3854 poll_drive(false, FD_RAW_NEED_DISK);
3855 process_fd_request();
3858 set_capacity(disk, floppy_sizes[UDRS->fd_device]);
3859 return res;
3862 static const struct block_device_operations floppy_fops = {
3863 .owner = THIS_MODULE,
3864 .open = floppy_open,
3865 .release = floppy_release,
3866 .ioctl = fd_ioctl,
3867 .getgeo = fd_getgeo,
3868 .check_events = floppy_check_events,
3869 .revalidate_disk = floppy_revalidate,
3873 * Floppy Driver initialization
3874 * =============================
3877 /* Determine the floppy disk controller type */
3878 /* This routine was written by David C. Niemi */
3879 static char __init get_fdc_version(void)
3881 int r;
3883 output_byte(FD_DUMPREGS); /* 82072 and better know DUMPREGS */
3884 if (FDCS->reset)
3885 return FDC_NONE;
3886 r = result();
3887 if (r <= 0x00)
3888 return FDC_NONE; /* No FDC present ??? */
3889 if ((r == 1) && (reply_buffer[0] == 0x80)) {
3890 pr_info("FDC %d is an 8272A\n", fdc);
3891 return FDC_8272A; /* 8272a/765 don't know DUMPREGS */
3893 if (r != 10) {
3894 pr_info("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
3895 fdc, r);
3896 return FDC_UNKNOWN;
3899 if (!fdc_configure()) {
3900 pr_info("FDC %d is an 82072\n", fdc);
3901 return FDC_82072; /* 82072 doesn't know CONFIGURE */
3904 output_byte(FD_PERPENDICULAR);
3905 if (need_more_output() == MORE_OUTPUT) {
3906 output_byte(0);
3907 } else {
3908 pr_info("FDC %d is an 82072A\n", fdc);
3909 return FDC_82072A; /* 82072A as found on Sparcs. */
3912 output_byte(FD_UNLOCK);
3913 r = result();
3914 if ((r == 1) && (reply_buffer[0] == 0x80)) {
3915 pr_info("FDC %d is a pre-1991 82077\n", fdc);
3916 return FDC_82077_ORIG; /* Pre-1991 82077, doesn't know
3917 * LOCK/UNLOCK */
3919 if ((r != 1) || (reply_buffer[0] != 0x00)) {
3920 pr_info("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
3921 fdc, r);
3922 return FDC_UNKNOWN;
3924 output_byte(FD_PARTID);
3925 r = result();
3926 if (r != 1) {
3927 pr_info("FDC %d init: PARTID: unexpected return of %d bytes.\n",
3928 fdc, r);
3929 return FDC_UNKNOWN;
3931 if (reply_buffer[0] == 0x80) {
3932 pr_info("FDC %d is a post-1991 82077\n", fdc);
3933 return FDC_82077; /* Revised 82077AA passes all the tests */
3935 switch (reply_buffer[0] >> 5) {
3936 case 0x0:
3937 /* Either a 82078-1 or a 82078SL running at 5Volt */
3938 pr_info("FDC %d is an 82078.\n", fdc);
3939 return FDC_82078;
3940 case 0x1:
3941 pr_info("FDC %d is a 44pin 82078\n", fdc);
3942 return FDC_82078;
3943 case 0x2:
3944 pr_info("FDC %d is a S82078B\n", fdc);
3945 return FDC_S82078B;
3946 case 0x3:
3947 pr_info("FDC %d is a National Semiconductor PC87306\n", fdc);
3948 return FDC_87306;
3949 default:
3950 pr_info("FDC %d init: 82078 variant with unknown PARTID=%d.\n",
3951 fdc, reply_buffer[0] >> 5);
3952 return FDC_82078_UNKN;
3954 } /* get_fdc_version */
3956 /* lilo configuration */
3958 static void __init floppy_set_flags(int *ints, int param, int param2)
3960 int i;
3962 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
3963 if (param)
3964 default_drive_params[i].params.flags |= param2;
3965 else
3966 default_drive_params[i].params.flags &= ~param2;
3968 DPRINT("%s flag 0x%x\n", param2 ? "Setting" : "Clearing", param);
3971 static void __init daring(int *ints, int param, int param2)
3973 int i;
3975 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
3976 if (param) {
3977 default_drive_params[i].params.select_delay = 0;
3978 default_drive_params[i].params.flags |=
3979 FD_SILENT_DCL_CLEAR;
3980 } else {
3981 default_drive_params[i].params.select_delay =
3982 2 * HZ / 100;
3983 default_drive_params[i].params.flags &=
3984 ~FD_SILENT_DCL_CLEAR;
3987 DPRINT("Assuming %s floppy hardware\n", param ? "standard" : "broken");
3990 static void __init set_cmos(int *ints, int dummy, int dummy2)
3992 int current_drive = 0;
3994 if (ints[0] != 2) {
3995 DPRINT("wrong number of parameters for CMOS\n");
3996 return;
3998 current_drive = ints[1];
3999 if (current_drive < 0 || current_drive >= 8) {
4000 DPRINT("bad drive for set_cmos\n");
4001 return;
4003 #if N_FDC > 1
4004 if (current_drive >= 4 && !FDC2)
4005 FDC2 = 0x370;
4006 #endif
4007 DP->cmos = ints[2];
4008 DPRINT("setting CMOS code to %d\n", ints[2]);
4011 static struct param_table {
4012 const char *name;
4013 void (*fn) (int *ints, int param, int param2);
4014 int *var;
4015 int def_param;
4016 int param2;
4017 } config_params[] __initdata = {
4018 {"allowed_drive_mask", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4019 {"all_drives", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4020 {"asus_pci", NULL, &allowed_drive_mask, 0x33, 0},
4021 {"irq", NULL, &FLOPPY_IRQ, 6, 0},
4022 {"dma", NULL, &FLOPPY_DMA, 2, 0},
4023 {"daring", daring, NULL, 1, 0},
4024 #if N_FDC > 1
4025 {"two_fdc", NULL, &FDC2, 0x370, 0},
4026 {"one_fdc", NULL, &FDC2, 0, 0},
4027 #endif
4028 {"thinkpad", floppy_set_flags, NULL, 1, FD_INVERTED_DCL},
4029 {"broken_dcl", floppy_set_flags, NULL, 1, FD_BROKEN_DCL},
4030 {"messages", floppy_set_flags, NULL, 1, FTD_MSG},
4031 {"silent_dcl_clear", floppy_set_flags, NULL, 1, FD_SILENT_DCL_CLEAR},
4032 {"debug", floppy_set_flags, NULL, 1, FD_DEBUG},
4033 {"nodma", NULL, &can_use_virtual_dma, 1, 0},
4034 {"omnibook", NULL, &can_use_virtual_dma, 1, 0},
4035 {"yesdma", NULL, &can_use_virtual_dma, 0, 0},
4036 {"fifo_depth", NULL, &fifo_depth, 0xa, 0},
4037 {"nofifo", NULL, &no_fifo, 0x20, 0},
4038 {"usefifo", NULL, &no_fifo, 0, 0},
4039 {"cmos", set_cmos, NULL, 0, 0},
4040 {"slow", NULL, &slow_floppy, 1, 0},
4041 {"unexpected_interrupts", NULL, &print_unex, 1, 0},
4042 {"no_unexpected_interrupts", NULL, &print_unex, 0, 0},
4043 {"L40SX", NULL, &print_unex, 0, 0}
4045 EXTRA_FLOPPY_PARAMS
4048 static int __init floppy_setup(char *str)
4050 int i;
4051 int param;
4052 int ints[11];
4054 str = get_options(str, ARRAY_SIZE(ints), ints);
4055 if (str) {
4056 for (i = 0; i < ARRAY_SIZE(config_params); i++) {
4057 if (strcmp(str, config_params[i].name) == 0) {
4058 if (ints[0])
4059 param = ints[1];
4060 else
4061 param = config_params[i].def_param;
4062 if (config_params[i].fn)
4063 config_params[i].fn(ints, param,
4064 config_params[i].
4065 param2);
4066 if (config_params[i].var) {
4067 DPRINT("%s=%d\n", str, param);
4068 *config_params[i].var = param;
4070 return 1;
4074 if (str) {
4075 DPRINT("unknown floppy option [%s]\n", str);
4077 DPRINT("allowed options are:");
4078 for (i = 0; i < ARRAY_SIZE(config_params); i++)
4079 pr_cont(" %s", config_params[i].name);
4080 pr_cont("\n");
4081 } else
4082 DPRINT("botched floppy option\n");
4083 DPRINT("Read Documentation/blockdev/floppy.txt\n");
4084 return 0;
4087 static int have_no_fdc = -ENODEV;
4089 static ssize_t floppy_cmos_show(struct device *dev,
4090 struct device_attribute *attr, char *buf)
4092 struct platform_device *p = to_platform_device(dev);
4093 int drive;
4095 drive = p->id;
4096 return sprintf(buf, "%X\n", UDP->cmos);
4099 static DEVICE_ATTR(cmos, S_IRUGO, floppy_cmos_show, NULL);
4101 static void floppy_device_release(struct device *dev)
4105 static int floppy_resume(struct device *dev)
4107 int fdc;
4109 for (fdc = 0; fdc < N_FDC; fdc++)
4110 if (FDCS->address != -1)
4111 user_reset_fdc(-1, FD_RESET_ALWAYS, false);
4113 return 0;
4116 static const struct dev_pm_ops floppy_pm_ops = {
4117 .resume = floppy_resume,
4118 .restore = floppy_resume,
4121 static struct platform_driver floppy_driver = {
4122 .driver = {
4123 .name = "floppy",
4124 .pm = &floppy_pm_ops,
4128 static struct platform_device floppy_device[N_DRIVE];
4130 static bool floppy_available(int drive)
4132 if (!(allowed_drive_mask & (1 << drive)))
4133 return false;
4134 if (fdc_state[FDC(drive)].version == FDC_NONE)
4135 return false;
4136 return true;
4139 static struct kobject *floppy_find(dev_t dev, int *part, void *data)
4141 int drive = (*part & 3) | ((*part & 0x80) >> 5);
4142 if (drive >= N_DRIVE || !floppy_available(drive))
4143 return NULL;
4144 if (((*part >> 2) & 0x1f) >= ARRAY_SIZE(floppy_type))
4145 return NULL;
4146 *part = 0;
4147 return get_disk(disks[drive]);
4150 static int __init do_floppy_init(void)
4152 int i, unit, drive, err;
4154 set_debugt();
4155 interruptjiffies = resultjiffies = jiffies;
4157 #if defined(CONFIG_PPC)
4158 if (check_legacy_ioport(FDC1))
4159 return -ENODEV;
4160 #endif
4162 raw_cmd = NULL;
4164 floppy_wq = alloc_ordered_workqueue("floppy", 0);
4165 if (!floppy_wq)
4166 return -ENOMEM;
4168 for (drive = 0; drive < N_DRIVE; drive++) {
4169 disks[drive] = alloc_disk(1);
4170 if (!disks[drive]) {
4171 err = -ENOMEM;
4172 goto out_put_disk;
4175 disks[drive]->queue = blk_init_queue(do_fd_request, &floppy_lock);
4176 if (!disks[drive]->queue) {
4177 err = -ENOMEM;
4178 goto out_put_disk;
4181 blk_queue_max_hw_sectors(disks[drive]->queue, 64);
4182 disks[drive]->major = FLOPPY_MAJOR;
4183 disks[drive]->first_minor = TOMINOR(drive);
4184 disks[drive]->fops = &floppy_fops;
4185 sprintf(disks[drive]->disk_name, "fd%d", drive);
4187 init_timer(&motor_off_timer[drive]);
4188 motor_off_timer[drive].data = drive;
4189 motor_off_timer[drive].function = motor_off_callback;
4192 err = register_blkdev(FLOPPY_MAJOR, "fd");
4193 if (err)
4194 goto out_put_disk;
4196 err = platform_driver_register(&floppy_driver);
4197 if (err)
4198 goto out_unreg_blkdev;
4200 blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
4201 floppy_find, NULL, NULL);
4203 for (i = 0; i < 256; i++)
4204 if (ITYPE(i))
4205 floppy_sizes[i] = floppy_type[ITYPE(i)].size;
4206 else
4207 floppy_sizes[i] = MAX_DISK_SIZE << 1;
4209 reschedule_timeout(MAXTIMEOUT, "floppy init");
4210 config_types();
4212 for (i = 0; i < N_FDC; i++) {
4213 fdc = i;
4214 memset(FDCS, 0, sizeof(*FDCS));
4215 FDCS->dtr = -1;
4216 FDCS->dor = 0x4;
4217 #if defined(__sparc__) || defined(__mc68000__)
4218 /*sparcs/sun3x don't have a DOR reset which we can fall back on to */
4219 #ifdef __mc68000__
4220 if (MACH_IS_SUN3X)
4221 #endif
4222 FDCS->version = FDC_82072A;
4223 #endif
4226 use_virtual_dma = can_use_virtual_dma & 1;
4227 fdc_state[0].address = FDC1;
4228 if (fdc_state[0].address == -1) {
4229 cancel_delayed_work(&fd_timeout);
4230 err = -ENODEV;
4231 goto out_unreg_region;
4233 #if N_FDC > 1
4234 fdc_state[1].address = FDC2;
4235 #endif
4237 fdc = 0; /* reset fdc in case of unexpected interrupt */
4238 err = floppy_grab_irq_and_dma();
4239 if (err) {
4240 cancel_delayed_work(&fd_timeout);
4241 err = -EBUSY;
4242 goto out_unreg_region;
4245 /* initialise drive state */
4246 for (drive = 0; drive < N_DRIVE; drive++) {
4247 memset(UDRS, 0, sizeof(*UDRS));
4248 memset(UDRWE, 0, sizeof(*UDRWE));
4249 set_bit(FD_DISK_NEWCHANGE_BIT, &UDRS->flags);
4250 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
4251 set_bit(FD_VERIFY_BIT, &UDRS->flags);
4252 UDRS->fd_device = -1;
4253 floppy_track_buffer = NULL;
4254 max_buffer_sectors = 0;
4257 * Small 10 msec delay to let through any interrupt that
4258 * initialization might have triggered, to not
4259 * confuse detection:
4261 msleep(10);
4263 for (i = 0; i < N_FDC; i++) {
4264 fdc = i;
4265 FDCS->driver_version = FD_DRIVER_VERSION;
4266 for (unit = 0; unit < 4; unit++)
4267 FDCS->track[unit] = 0;
4268 if (FDCS->address == -1)
4269 continue;
4270 FDCS->rawcmd = 2;
4271 if (user_reset_fdc(-1, FD_RESET_ALWAYS, false)) {
4272 /* free ioports reserved by floppy_grab_irq_and_dma() */
4273 floppy_release_regions(fdc);
4274 FDCS->address = -1;
4275 FDCS->version = FDC_NONE;
4276 continue;
4278 /* Try to determine the floppy controller type */
4279 FDCS->version = get_fdc_version();
4280 if (FDCS->version == FDC_NONE) {
4281 /* free ioports reserved by floppy_grab_irq_and_dma() */
4282 floppy_release_regions(fdc);
4283 FDCS->address = -1;
4284 continue;
4286 if (can_use_virtual_dma == 2 && FDCS->version < FDC_82072A)
4287 can_use_virtual_dma = 0;
4289 have_no_fdc = 0;
4290 /* Not all FDCs seem to be able to handle the version command
4291 * properly, so force a reset for the standard FDC clones,
4292 * to avoid interrupt garbage.
4294 user_reset_fdc(-1, FD_RESET_ALWAYS, false);
4296 fdc = 0;
4297 cancel_delayed_work(&fd_timeout);
4298 current_drive = 0;
4299 initialized = true;
4300 if (have_no_fdc) {
4301 DPRINT("no floppy controllers found\n");
4302 err = have_no_fdc;
4303 goto out_release_dma;
4306 for (drive = 0; drive < N_DRIVE; drive++) {
4307 if (!floppy_available(drive))
4308 continue;
4310 floppy_device[drive].name = floppy_device_name;
4311 floppy_device[drive].id = drive;
4312 floppy_device[drive].dev.release = floppy_device_release;
4314 err = platform_device_register(&floppy_device[drive]);
4315 if (err)
4316 goto out_remove_drives;
4318 err = device_create_file(&floppy_device[drive].dev,
4319 &dev_attr_cmos);
4320 if (err)
4321 goto out_unreg_platform_dev;
4323 /* to be cleaned up... */
4324 disks[drive]->private_data = (void *)(long)drive;
4325 disks[drive]->flags |= GENHD_FL_REMOVABLE;
4326 disks[drive]->driverfs_dev = &floppy_device[drive].dev;
4327 add_disk(disks[drive]);
4330 return 0;
4332 out_unreg_platform_dev:
4333 platform_device_unregister(&floppy_device[drive]);
4334 out_remove_drives:
4335 while (drive--) {
4336 if (floppy_available(drive)) {
4337 del_gendisk(disks[drive]);
4338 device_remove_file(&floppy_device[drive].dev, &dev_attr_cmos);
4339 platform_device_unregister(&floppy_device[drive]);
4342 out_release_dma:
4343 if (atomic_read(&usage_count))
4344 floppy_release_irq_and_dma();
4345 out_unreg_region:
4346 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4347 platform_driver_unregister(&floppy_driver);
4348 out_unreg_blkdev:
4349 unregister_blkdev(FLOPPY_MAJOR, "fd");
4350 out_put_disk:
4351 destroy_workqueue(floppy_wq);
4352 for (drive = 0; drive < N_DRIVE; drive++) {
4353 if (!disks[drive])
4354 break;
4355 if (disks[drive]->queue) {
4356 del_timer_sync(&motor_off_timer[drive]);
4357 blk_cleanup_queue(disks[drive]->queue);
4358 disks[drive]->queue = NULL;
4360 put_disk(disks[drive]);
4362 return err;
4365 #ifndef MODULE
4366 static __init void floppy_async_init(void *data, async_cookie_t cookie)
4368 do_floppy_init();
4370 #endif
4372 static int __init floppy_init(void)
4374 #ifdef MODULE
4375 return do_floppy_init();
4376 #else
4377 /* Don't hold up the bootup by the floppy initialization */
4378 async_schedule(floppy_async_init, NULL);
4379 return 0;
4380 #endif
4383 static const struct io_region {
4384 int offset;
4385 int size;
4386 } io_regions[] = {
4387 { 2, 1 },
4388 /* address + 3 is sometimes reserved by pnp bios for motherboard */
4389 { 4, 2 },
4390 /* address + 6 is reserved, and may be taken by IDE.
4391 * Unfortunately, Adaptec doesn't know this :-(, */
4392 { 7, 1 },
4395 static void floppy_release_allocated_regions(int fdc, const struct io_region *p)
4397 while (p != io_regions) {
4398 p--;
4399 release_region(FDCS->address + p->offset, p->size);
4403 #define ARRAY_END(X) (&((X)[ARRAY_SIZE(X)]))
4405 static int floppy_request_regions(int fdc)
4407 const struct io_region *p;
4409 for (p = io_regions; p < ARRAY_END(io_regions); p++) {
4410 if (!request_region(FDCS->address + p->offset,
4411 p->size, "floppy")) {
4412 DPRINT("Floppy io-port 0x%04lx in use\n",
4413 FDCS->address + p->offset);
4414 floppy_release_allocated_regions(fdc, p);
4415 return -EBUSY;
4418 return 0;
4421 static void floppy_release_regions(int fdc)
4423 floppy_release_allocated_regions(fdc, ARRAY_END(io_regions));
4426 static int floppy_grab_irq_and_dma(void)
4428 if (atomic_inc_return(&usage_count) > 1)
4429 return 0;
4432 * We might have scheduled a free_irq(), wait it to
4433 * drain first:
4435 flush_workqueue(floppy_wq);
4437 if (fd_request_irq()) {
4438 DPRINT("Unable to grab IRQ%d for the floppy driver\n",
4439 FLOPPY_IRQ);
4440 atomic_dec(&usage_count);
4441 return -1;
4443 if (fd_request_dma()) {
4444 DPRINT("Unable to grab DMA%d for the floppy driver\n",
4445 FLOPPY_DMA);
4446 if (can_use_virtual_dma & 2)
4447 use_virtual_dma = can_use_virtual_dma = 1;
4448 if (!(can_use_virtual_dma & 1)) {
4449 fd_free_irq();
4450 atomic_dec(&usage_count);
4451 return -1;
4455 for (fdc = 0; fdc < N_FDC; fdc++) {
4456 if (FDCS->address != -1) {
4457 if (floppy_request_regions(fdc))
4458 goto cleanup;
4461 for (fdc = 0; fdc < N_FDC; fdc++) {
4462 if (FDCS->address != -1) {
4463 reset_fdc_info(1);
4464 fd_outb(FDCS->dor, FD_DOR);
4467 fdc = 0;
4468 set_dor(0, ~0, 8); /* avoid immediate interrupt */
4470 for (fdc = 0; fdc < N_FDC; fdc++)
4471 if (FDCS->address != -1)
4472 fd_outb(FDCS->dor, FD_DOR);
4474 * The driver will try and free resources and relies on us
4475 * to know if they were allocated or not.
4477 fdc = 0;
4478 irqdma_allocated = 1;
4479 return 0;
4480 cleanup:
4481 fd_free_irq();
4482 fd_free_dma();
4483 while (--fdc >= 0)
4484 floppy_release_regions(fdc);
4485 atomic_dec(&usage_count);
4486 return -1;
4489 static void floppy_release_irq_and_dma(void)
4491 int old_fdc;
4492 #ifndef __sparc__
4493 int drive;
4494 #endif
4495 long tmpsize;
4496 unsigned long tmpaddr;
4498 if (!atomic_dec_and_test(&usage_count))
4499 return;
4501 if (irqdma_allocated) {
4502 fd_disable_dma();
4503 fd_free_dma();
4504 fd_free_irq();
4505 irqdma_allocated = 0;
4507 set_dor(0, ~0, 8);
4508 #if N_FDC > 1
4509 set_dor(1, ~8, 0);
4510 #endif
4512 if (floppy_track_buffer && max_buffer_sectors) {
4513 tmpsize = max_buffer_sectors * 1024;
4514 tmpaddr = (unsigned long)floppy_track_buffer;
4515 floppy_track_buffer = NULL;
4516 max_buffer_sectors = 0;
4517 buffer_min = buffer_max = -1;
4518 fd_dma_mem_free(tmpaddr, tmpsize);
4520 #ifndef __sparc__
4521 for (drive = 0; drive < N_FDC * 4; drive++)
4522 if (timer_pending(motor_off_timer + drive))
4523 pr_info("motor off timer %d still active\n", drive);
4524 #endif
4526 if (delayed_work_pending(&fd_timeout))
4527 pr_info("floppy timer still active:%s\n", timeout_message);
4528 if (delayed_work_pending(&fd_timer))
4529 pr_info("auxiliary floppy timer still active\n");
4530 if (work_pending(&floppy_work))
4531 pr_info("work still pending\n");
4532 old_fdc = fdc;
4533 for (fdc = 0; fdc < N_FDC; fdc++)
4534 if (FDCS->address != -1)
4535 floppy_release_regions(fdc);
4536 fdc = old_fdc;
4539 #ifdef MODULE
4541 static char *floppy;
4543 static void __init parse_floppy_cfg_string(char *cfg)
4545 char *ptr;
4547 while (*cfg) {
4548 ptr = cfg;
4549 while (*cfg && *cfg != ' ' && *cfg != '\t')
4550 cfg++;
4551 if (*cfg) {
4552 *cfg = '\0';
4553 cfg++;
4555 if (*ptr)
4556 floppy_setup(ptr);
4560 static int __init floppy_module_init(void)
4562 if (floppy)
4563 parse_floppy_cfg_string(floppy);
4564 return floppy_init();
4566 module_init(floppy_module_init);
4568 static void __exit floppy_module_exit(void)
4570 int drive;
4572 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4573 unregister_blkdev(FLOPPY_MAJOR, "fd");
4574 platform_driver_unregister(&floppy_driver);
4576 destroy_workqueue(floppy_wq);
4578 for (drive = 0; drive < N_DRIVE; drive++) {
4579 del_timer_sync(&motor_off_timer[drive]);
4581 if (floppy_available(drive)) {
4582 del_gendisk(disks[drive]);
4583 device_remove_file(&floppy_device[drive].dev, &dev_attr_cmos);
4584 platform_device_unregister(&floppy_device[drive]);
4586 blk_cleanup_queue(disks[drive]->queue);
4589 * These disks have not called add_disk(). Don't put down
4590 * queue reference in put_disk().
4592 if (!(allowed_drive_mask & (1 << drive)) ||
4593 fdc_state[FDC(drive)].version == FDC_NONE)
4594 disks[drive]->queue = NULL;
4596 put_disk(disks[drive]);
4599 cancel_delayed_work_sync(&fd_timeout);
4600 cancel_delayed_work_sync(&fd_timer);
4602 if (atomic_read(&usage_count))
4603 floppy_release_irq_and_dma();
4605 /* eject disk, if any */
4606 fd_eject(0);
4609 module_exit(floppy_module_exit);
4611 module_param(floppy, charp, 0);
4612 module_param(FLOPPY_IRQ, int, 0);
4613 module_param(FLOPPY_DMA, int, 0);
4614 MODULE_AUTHOR("Alain L. Knaff");
4615 MODULE_SUPPORTED_DEVICE("fd");
4616 MODULE_LICENSE("GPL");
4618 /* This doesn't actually get used other than for module information */
4619 static const struct pnp_device_id floppy_pnpids[] = {
4620 {"PNP0700", 0},
4624 MODULE_DEVICE_TABLE(pnp, floppy_pnpids);
4626 #else
4628 __setup("floppy=", floppy_setup);
4629 module_init(floppy_init)
4630 #endif
4632 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);