Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/drivers/block/swim3.c

  1 /*
  2  * Driver for the SWIM3 (Super Woz Integrated Machine 3)
  3  * floppy controller found on Power Macintoshes.
  4  *
  5  * Copyright (C) 1996 Paul Mackerras.
  6  *
  7  * This program is free software; you can redistribute it and/or
  8  * modify it under the terms of the GNU General Public License
  9  * as published by the Free Software Foundation; either version
 10  * 2 of the License, or (at your option) any later version.
 11  */
 12 
 13 /*
 14  * TODO:
 15  * handle 2 drives
 16  * handle GCR disks
 17  */
 18 
 19 #undef DEBUG
 20 
 21 #include <linux/stddef.h>
 22 #include <linux/kernel.h>
 23 #include <linux/sched.h>
 24 #include <linux/timer.h>
 25 #include <linux/delay.h>
 26 #include <linux/fd.h>
 27 #include <linux/ioctl.h>
 28 #include <linux/blkdev.h>
 29 #include <linux/interrupt.h>
 30 #include <linux/mutex.h>
 31 #include <linux/module.h>
 32 #include <linux/spinlock.h>
 33 #include <linux/wait.h>
 34 #include <asm/io.h>
 35 #include <asm/dbdma.h>
 36 #include <asm/prom.h>
 37 #include <asm/uaccess.h>
 38 #include <asm/mediabay.h>
 39 #include <asm/machdep.h>
 40 #include <asm/pmac_feature.h>
 41 
 42 #define MAX_FLOPPIES    2
 43 
 44 static DEFINE_MUTEX(swim3_mutex);
 45 static struct gendisk *disks[MAX_FLOPPIES];
 46 
 47 enum swim_state {
 48         idle,
 49         locating,
 50         seeking,
 51         settling,
 52         do_transfer,
 53         jogging,
 54         available,
 55         revalidating,
 56         ejecting
 57 };
 58 
 59 #define REG(x)  unsigned char x; char x ## _pad[15];
 60 
 61 /*
 62  * The names for these registers mostly represent speculation on my part.
 63  * It will be interesting to see how close they are to the names Apple uses.
 64  */
 65 struct swim3 {
 66         REG(data);
 67         REG(timer);             /* counts down at 1MHz */
 68         REG(error);
 69         REG(mode);
 70         REG(select);            /* controls CA0, CA1, CA2 and LSTRB signals */
 71         REG(setup);
 72         REG(control);           /* writing bits clears them */
 73         REG(status);            /* writing bits sets them in control */
 74         REG(intr);
 75         REG(nseek);             /* # tracks to seek */
 76         REG(ctrack);            /* current track number */
 77         REG(csect);             /* current sector number */
 78         REG(gap3);              /* size of gap 3 in track format */
 79         REG(sector);            /* sector # to read or write */
 80         REG(nsect);             /* # sectors to read or write */
 81         REG(intr_enable);
 82 };
 83 
 84 #define control_bic     control
 85 #define control_bis     status
 86 
 87 /* Bits in select register */
 88 #define CA_MASK         7
 89 #define LSTRB           8
 90 
 91 /* Bits in control register */
 92 #define DO_SEEK         0x80
 93 #define FORMAT          0x40
 94 #define SELECT          0x20
 95 #define WRITE_SECTORS   0x10
 96 #define DO_ACTION       0x08
 97 #define DRIVE2_ENABLE   0x04
 98 #define DRIVE_ENABLE    0x02
 99 #define INTR_ENABLE     0x01
100 
101 /* Bits in status register */
102 #define FIFO_1BYTE      0x80
103 #define FIFO_2BYTE      0x40
104 #define ERROR           0x20
105 #define DATA            0x08
106 #define RDDATA          0x04
107 #define INTR_PENDING    0x02
108 #define MARK_BYTE       0x01
109 
110 /* Bits in intr and intr_enable registers */
111 #define ERROR_INTR      0x20
112 #define DATA_CHANGED    0x10
113 #define TRANSFER_DONE   0x08
114 #define SEEN_SECTOR     0x04
115 #define SEEK_DONE       0x02
116 #define TIMER_DONE      0x01
117 
118 /* Bits in error register */
119 #define ERR_DATA_CRC    0x80
120 #define ERR_ADDR_CRC    0x40
121 #define ERR_OVERRUN     0x04
122 #define ERR_UNDERRUN    0x01
123 
124 /* Bits in setup register */
125 #define S_SW_RESET      0x80
126 #define S_GCR_WRITE     0x40
127 #define S_IBM_DRIVE     0x20
128 #define S_TEST_MODE     0x10
129 #define S_FCLK_DIV2     0x08
130 #define S_GCR           0x04
131 #define S_COPY_PROT     0x02
132 #define S_INV_WDATA     0x01
133 
134 /* Select values for swim3_action */
135 #define SEEK_POSITIVE   0
136 #define SEEK_NEGATIVE   4
137 #define STEP            1
138 #define MOTOR_ON        2
139 #define MOTOR_OFF       6
140 #define INDEX           3
141 #define EJECT           7
142 #define SETMFM          9
143 #define SETGCR          13
144 
145 /* Select values for swim3_select and swim3_readbit */
146 #define STEP_DIR        0
147 #define STEPPING        1
148 #define MOTOR_ON        2
149 #define RELAX           3       /* also eject in progress */
150 #define READ_DATA_0     4
151 #define TWOMEG_DRIVE    5
152 #define SINGLE_SIDED    6       /* drive or diskette is 4MB type? */
153 #define DRIVE_PRESENT   7
154 #define DISK_IN         8
155 #define WRITE_PROT      9
156 #define TRACK_ZERO      10
157 #define TACHO           11
158 #define READ_DATA_1     12
159 #define MFM_MODE        13
160 #define SEEK_COMPLETE   14
161 #define ONEMEG_MEDIA    15
162 
163 /* Definitions of values used in writing and formatting */
164 #define DATA_ESCAPE     0x99
165 #define GCR_SYNC_EXC    0x3f
166 #define GCR_SYNC_CONV   0x80
167 #define GCR_FIRST_MARK  0xd5
168 #define GCR_SECOND_MARK 0xaa
169 #define GCR_ADDR_MARK   "\xd5\xaa\x00"
170 #define GCR_DATA_MARK   "\xd5\xaa\x0b"
171 #define GCR_SLIP_BYTE   "\x27\xaa"
172 #define GCR_SELF_SYNC   "\x3f\xbf\x1e\x34\x3c\x3f"
173 
174 #define DATA_99         "\x99\x99"
175 #define MFM_ADDR_MARK   "\x99\xa1\x99\xa1\x99\xa1\x99\xfe"
176 #define MFM_INDEX_MARK  "\x99\xc2\x99\xc2\x99\xc2\x99\xfc"
177 #define MFM_GAP_LEN     12
178 
179 struct floppy_state {
180         enum swim_state state;
181         struct swim3 __iomem *swim3;    /* hardware registers */
182         struct dbdma_regs __iomem *dma; /* DMA controller registers */
183         int     swim3_intr;     /* interrupt number for SWIM3 */
184         int     dma_intr;       /* interrupt number for DMA channel */
185         int     cur_cyl;        /* cylinder head is on, or -1 */
186         int     cur_sector;     /* last sector we saw go past */
187         int     req_cyl;        /* the cylinder for the current r/w request */
188         int     head;           /* head number ditto */
189         int     req_sector;     /* sector number ditto */
190         int     scount;         /* # sectors we're transferring at present */
191         int     retries;
192         int     settle_time;
193         int     secpercyl;      /* disk geometry information */
194         int     secpertrack;
195         int     total_secs;
196         int     write_prot;     /* 1 if write-protected, 0 if not, -1 dunno */
197         struct dbdma_cmd *dma_cmd;
198         int     ref_count;
199         int     expect_cyl;
200         struct timer_list timeout;
201         int     timeout_pending;
202         int     ejected;
203         wait_queue_head_t wait;
204         int     wanted;
205         struct macio_dev *mdev;
206         char    dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)];
207         int     index;
208         struct request *cur_req;
209 };
210 
211 #define swim3_err(fmt, arg...)  dev_err(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
212 #define swim3_warn(fmt, arg...) dev_warn(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
213 #define swim3_info(fmt, arg...) dev_info(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
214 
215 #ifdef DEBUG
216 #define swim3_dbg(fmt, arg...)  dev_dbg(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
217 #else
218 #define swim3_dbg(fmt, arg...)  do { } while(0)
219 #endif
220 
221 static struct floppy_state floppy_states[MAX_FLOPPIES];
222 static int floppy_count = 0;
223 static DEFINE_SPINLOCK(swim3_lock);
224 
225 static unsigned short write_preamble[] = {
226         0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, /* gap field */
227         0, 0, 0, 0, 0, 0,                       /* sync field */
228         0x99a1, 0x99a1, 0x99a1, 0x99fb,         /* data address mark */
229         0x990f                                  /* no escape for 512 bytes */
230 };
231 
232 static unsigned short write_postamble[] = {
233         0x9904,                                 /* insert CRC */
234         0x4e4e, 0x4e4e,
235         0x9908,                                 /* stop writing */
236         0, 0, 0, 0, 0, 0
237 };
238 
239 static void seek_track(struct floppy_state *fs, int n);
240 static void init_dma(struct dbdma_cmd *cp, int cmd, void *buf, int count);
241 static void act(struct floppy_state *fs);
242 static void scan_timeout(unsigned long data);
243 static void seek_timeout(unsigned long data);
244 static void settle_timeout(unsigned long data);
245 static void xfer_timeout(unsigned long data);
246 static irqreturn_t swim3_interrupt(int irq, void *dev_id);
247 /*static void fd_dma_interrupt(int irq, void *dev_id);*/
248 static int grab_drive(struct floppy_state *fs, enum swim_state state,
249                       int interruptible);
250 static void release_drive(struct floppy_state *fs);
251 static int fd_eject(struct floppy_state *fs);
252 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
253                         unsigned int cmd, unsigned long param);
254 static int floppy_open(struct block_device *bdev, fmode_t mode);
255 static void floppy_release(struct gendisk *disk, fmode_t mode);
256 static unsigned int floppy_check_events(struct gendisk *disk,
257                                         unsigned int clearing);
258 static int floppy_revalidate(struct gendisk *disk);
259 
260 static bool swim3_end_request(struct floppy_state *fs, int err, unsigned int nr_bytes)
261 {
262         struct request *req = fs->cur_req;
263         int rc;
264 
265         swim3_dbg("  end request, err=%d nr_bytes=%d, cur_req=%p\n",
266                   err, nr_bytes, req);
267 
268         if (err)
269                 nr_bytes = blk_rq_cur_bytes(req);
270         rc = __blk_end_request(req, err, nr_bytes);
271         if (rc)
272                 return true;
273         fs->cur_req = NULL;
274         return false;
275 }
276 
277 static void swim3_select(struct floppy_state *fs, int sel)
278 {
279         struct swim3 __iomem *sw = fs->swim3;
280 
281         out_8(&sw->select, RELAX);
282         if (sel & 8)
283                 out_8(&sw->control_bis, SELECT);
284         else
285                 out_8(&sw->control_bic, SELECT);
286         out_8(&sw->select, sel & CA_MASK);
287 }
288 
289 static void swim3_action(struct floppy_state *fs, int action)
290 {
291         struct swim3 __iomem *sw = fs->swim3;
292 
293         swim3_select(fs, action);
294         udelay(1);
295         out_8(&sw->select, sw->select | LSTRB);
296         udelay(2);
297         out_8(&sw->select, sw->select & ~LSTRB);
298         udelay(1);
299 }
300 
301 static int swim3_readbit(struct floppy_state *fs, int bit)
302 {
303         struct swim3 __iomem *sw = fs->swim3;
304         int stat;
305 
306         swim3_select(fs, bit);
307         udelay(1);
308         stat = in_8(&sw->status);
309         return (stat & DATA) == 0;
310 }
311 
312 static void start_request(struct floppy_state *fs)
313 {
314         struct request *req;
315         unsigned long x;
316 
317         swim3_dbg("start request, initial state=%d\n", fs->state);
318 
319         if (fs->state == idle && fs->wanted) {
320                 fs->state = available;
321                 wake_up(&fs->wait);
322                 return;
323         }
324         while (fs->state == idle) {
325                 swim3_dbg("start request, idle loop, cur_req=%p\n", fs->cur_req);
326                 if (!fs->cur_req) {
327                         fs->cur_req = blk_fetch_request(disks[fs->index]->queue);
328                         swim3_dbg("  fetched request %p\n", fs->cur_req);
329                         if (!fs->cur_req)
330                                 break;
331                 }
332                 req = fs->cur_req;
333 
334                 if (fs->mdev->media_bay &&
335                     check_media_bay(fs->mdev->media_bay) != MB_FD) {
336                         swim3_dbg("%s", "  media bay absent, dropping req\n");
337                         swim3_end_request(fs, -ENODEV, 0);
338                         continue;
339                 }
340 
341 #if 0 /* This is really too verbose */
342                 swim3_dbg("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%u buf=%p\n",
343                           req->rq_disk->disk_name, req->cmd,
344                           (long)blk_rq_pos(req), blk_rq_sectors(req),
345                           bio_data(req->bio));
346                 swim3_dbg("           errors=%d current_nr_sectors=%u\n",
347                           req->errors, blk_rq_cur_sectors(req));
348 #endif
349 
350                 if (blk_rq_pos(req) >= fs->total_secs) {
351                         swim3_dbg("  pos out of bounds (%ld, max is %ld)\n",
352                                   (long)blk_rq_pos(req), (long)fs->total_secs);
353                         swim3_end_request(fs, -EIO, 0);
354                         continue;
355                 }
356                 if (fs->ejected) {
357                         swim3_dbg("%s", "  disk ejected\n");
358                         swim3_end_request(fs, -EIO, 0);
359                         continue;
360                 }
361 
362                 if (rq_data_dir(req) == WRITE) {
363                         if (fs->write_prot < 0)
364                                 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
365                         if (fs->write_prot) {
366                                 swim3_dbg("%s", "  try to write, disk write protected\n");
367                                 swim3_end_request(fs, -EIO, 0);
368                                 continue;
369                         }
370                 }
371 
372                 /* Do not remove the cast. blk_rq_pos(req) is now a
373                  * sector_t and can be 64 bits, but it will never go
374                  * past 32 bits for this driver anyway, so we can
375                  * safely cast it down and not have to do a 64/32
376                  * division
377                  */
378                 fs->req_cyl = ((long)blk_rq_pos(req)) / fs->secpercyl;
379                 x = ((long)blk_rq_pos(req)) % fs->secpercyl;
380                 fs->head = x / fs->secpertrack;
381                 fs->req_sector = x % fs->secpertrack + 1;
382                 fs->state = do_transfer;
383                 fs->retries = 0;
384 
385                 act(fs);
386         }
387 }
388 
389 static void do_fd_request(struct request_queue * q)
390 {
391         start_request(q->queuedata);
392 }
393 
394 static void set_timeout(struct floppy_state *fs, int nticks,
395                         void (*proc)(unsigned long))
396 {
397         if (fs->timeout_pending)
398                 del_timer(&fs->timeout);
399         fs->timeout.expires = jiffies + nticks;
400         fs->timeout.function = proc;
401         fs->timeout.data = (unsigned long) fs;
402         add_timer(&fs->timeout);
403         fs->timeout_pending = 1;
404 }
405 
406 static inline void scan_track(struct floppy_state *fs)
407 {
408         struct swim3 __iomem *sw = fs->swim3;
409 
410         swim3_select(fs, READ_DATA_0);
411         in_8(&sw->intr);                /* clear SEEN_SECTOR bit */
412         in_8(&sw->error);
413         out_8(&sw->intr_enable, SEEN_SECTOR);
414         out_8(&sw->control_bis, DO_ACTION);
415         /* enable intr when track found */
416         set_timeout(fs, HZ, scan_timeout);      /* enable timeout */
417 }
418 
419 static inline void seek_track(struct floppy_state *fs, int n)
420 {
421         struct swim3 __iomem *sw = fs->swim3;
422 
423         if (n >= 0) {
424                 swim3_action(fs, SEEK_POSITIVE);
425                 sw->nseek = n;
426         } else {
427                 swim3_action(fs, SEEK_NEGATIVE);
428                 sw->nseek = -n;
429         }
430         fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1;
431         swim3_select(fs, STEP);
432         in_8(&sw->error);
433         /* enable intr when seek finished */
434         out_8(&sw->intr_enable, SEEK_DONE);
435         out_8(&sw->control_bis, DO_SEEK);
436         set_timeout(fs, 3*HZ, seek_timeout);    /* enable timeout */
437         fs->settle_time = 0;
438 }
439 
440 static inline void init_dma(struct dbdma_cmd *cp, int cmd,
441                             void *buf, int count)
442 {
443         st_le16(&cp->req_count, count);
444         st_le16(&cp->command, cmd);
445         st_le32(&cp->phy_addr, virt_to_bus(buf));
446         cp->xfer_status = 0;
447 }
448 
449 static inline void setup_transfer(struct floppy_state *fs)
450 {
451         int n;
452         struct swim3 __iomem *sw = fs->swim3;
453         struct dbdma_cmd *cp = fs->dma_cmd;
454         struct dbdma_regs __iomem *dr = fs->dma;
455         struct request *req = fs->cur_req;
456 
457         if (blk_rq_cur_sectors(req) <= 0) {
458                 swim3_warn("%s", "Transfer 0 sectors ?\n");
459                 return;
460         }
461         if (rq_data_dir(req) == WRITE)
462                 n = 1;
463         else {
464                 n = fs->secpertrack - fs->req_sector + 1;
465                 if (n > blk_rq_cur_sectors(req))
466                         n = blk_rq_cur_sectors(req);
467         }
468 
469         swim3_dbg("  setup xfer at sect %d (of %d) head %d for %d\n",
470                   fs->req_sector, fs->secpertrack, fs->head, n);
471 
472         fs->scount = n;
473         swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
474         out_8(&sw->sector, fs->req_sector);
475         out_8(&sw->nsect, n);
476         out_8(&sw->gap3, 0);
477         out_le32(&dr->cmdptr, virt_to_bus(cp));
478         if (rq_data_dir(req) == WRITE) {
479                 /* Set up 3 dma commands: write preamble, data, postamble */
480                 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble));
481                 ++cp;
482                 init_dma(cp, OUTPUT_MORE, bio_data(req->bio), 512);
483                 ++cp;
484                 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble));
485         } else {
486                 init_dma(cp, INPUT_LAST, bio_data(req->bio), n * 512);
487         }
488         ++cp;
489         out_le16(&cp->command, DBDMA_STOP);
490         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
491         in_8(&sw->error);
492         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
493         if (rq_data_dir(req) == WRITE)
494                 out_8(&sw->control_bis, WRITE_SECTORS);
495         in_8(&sw->intr);
496         out_le32(&dr->control, (RUN << 16) | RUN);
497         /* enable intr when transfer complete */
498         out_8(&sw->intr_enable, TRANSFER_DONE);
499         out_8(&sw->control_bis, DO_ACTION);
500         set_timeout(fs, 2*HZ, xfer_timeout);    /* enable timeout */
501 }
502 
503 static void act(struct floppy_state *fs)
504 {
505         for (;;) {
506                 swim3_dbg("  act loop, state=%d, req_cyl=%d, cur_cyl=%d\n",
507                           fs->state, fs->req_cyl, fs->cur_cyl);
508 
509                 switch (fs->state) {
510                 case idle:
511                         return;         /* XXX shouldn't get here */
512 
513                 case locating:
514                         if (swim3_readbit(fs, TRACK_ZERO)) {
515                                 swim3_dbg("%s", "    locate track 0\n");
516                                 fs->cur_cyl = 0;
517                                 if (fs->req_cyl == 0)
518                                         fs->state = do_transfer;
519                                 else
520                                         fs->state = seeking;
521                                 break;
522                         }
523                         scan_track(fs);
524                         return;
525 
526                 case seeking:
527                         if (fs->cur_cyl < 0) {
528                                 fs->expect_cyl = -1;
529                                 fs->state = locating;
530                                 break;
531                         }
532                         if (fs->req_cyl == fs->cur_cyl) {
533                                 swim3_warn("%s", "Whoops, seeking 0\n");
534                                 fs->state = do_transfer;
535                                 break;
536                         }
537                         seek_track(fs, fs->req_cyl - fs->cur_cyl);
538                         return;
539 
540                 case settling:
541                         /* check for SEEK_COMPLETE after 30ms */
542                         fs->settle_time = (HZ + 32) / 33;
543                         set_timeout(fs, fs->settle_time, settle_timeout);
544                         return;
545 
546                 case do_transfer:
547                         if (fs->cur_cyl != fs->req_cyl) {
548                                 if (fs->retries > 5) {
549                                         swim3_err("Wrong cylinder in transfer, want: %d got %d\n",
550                                                   fs->req_cyl, fs->cur_cyl);
551                                         swim3_end_request(fs, -EIO, 0);
552                                         fs->state = idle;
553                                         return;
554                                 }
555                                 fs->state = seeking;
556                                 break;
557                         }
558                         setup_transfer(fs);
559                         return;
560 
561                 case jogging:
562                         seek_track(fs, -5);
563                         return;
564 
565                 default:
566                         swim3_err("Unknown state %d\n", fs->state);
567                         return;
568                 }
569         }
570 }
571 
572 static void scan_timeout(unsigned long data)
573 {
574         struct floppy_state *fs = (struct floppy_state *) data;
575         struct swim3 __iomem *sw = fs->swim3;
576         unsigned long flags;
577 
578         swim3_dbg("* scan timeout, state=%d\n", fs->state);
579 
580         spin_lock_irqsave(&swim3_lock, flags);
581         fs->timeout_pending = 0;
582         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
583         out_8(&sw->select, RELAX);
584         out_8(&sw->intr_enable, 0);
585         fs->cur_cyl = -1;
586         if (fs->retries > 5) {
587                 swim3_end_request(fs, -EIO, 0);
588                 fs->state = idle;
589                 start_request(fs);
590         } else {
591                 fs->state = jogging;
592                 act(fs);
593         }
594         spin_unlock_irqrestore(&swim3_lock, flags);
595 }
596 
597 static void seek_timeout(unsigned long data)
598 {
599         struct floppy_state *fs = (struct floppy_state *) data;
600         struct swim3 __iomem *sw = fs->swim3;
601         unsigned long flags;
602 
603         swim3_dbg("* seek timeout, state=%d\n", fs->state);
604 
605         spin_lock_irqsave(&swim3_lock, flags);
606         fs->timeout_pending = 0;
607         out_8(&sw->control_bic, DO_SEEK);
608         out_8(&sw->select, RELAX);
609         out_8(&sw->intr_enable, 0);
610         swim3_err("%s", "Seek timeout\n");
611         swim3_end_request(fs, -EIO, 0);
612         fs->state = idle;
613         start_request(fs);
614         spin_unlock_irqrestore(&swim3_lock, flags);
615 }
616 
617 static void settle_timeout(unsigned long data)
618 {
619         struct floppy_state *fs = (struct floppy_state *) data;
620         struct swim3 __iomem *sw = fs->swim3;
621         unsigned long flags;
622 
623         swim3_dbg("* settle timeout, state=%d\n", fs->state);
624 
625         spin_lock_irqsave(&swim3_lock, flags);
626         fs->timeout_pending = 0;
627         if (swim3_readbit(fs, SEEK_COMPLETE)) {
628                 out_8(&sw->select, RELAX);
629                 fs->state = locating;
630                 act(fs);
631                 goto unlock;
632         }
633         out_8(&sw->select, RELAX);
634         if (fs->settle_time < 2*HZ) {
635                 ++fs->settle_time;
636                 set_timeout(fs, 1, settle_timeout);
637                 goto unlock;
638         }
639         swim3_err("%s", "Seek settle timeout\n");
640         swim3_end_request(fs, -EIO, 0);
641         fs->state = idle;
642         start_request(fs);
643  unlock:
644         spin_unlock_irqrestore(&swim3_lock, flags);
645 }
646 
647 static void xfer_timeout(unsigned long data)
648 {
649         struct floppy_state *fs = (struct floppy_state *) data;
650         struct swim3 __iomem *sw = fs->swim3;
651         struct dbdma_regs __iomem *dr = fs->dma;
652         unsigned long flags;
653         int n;
654 
655         swim3_dbg("* xfer timeout, state=%d\n", fs->state);
656 
657         spin_lock_irqsave(&swim3_lock, flags);
658         fs->timeout_pending = 0;
659         out_le32(&dr->control, RUN << 16);
660         /* We must wait a bit for dbdma to stop */
661         for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++)
662                 udelay(1);
663         out_8(&sw->intr_enable, 0);
664         out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
665         out_8(&sw->select, RELAX);
666         swim3_err("Timeout %sing sector %ld\n",
667                (rq_data_dir(fs->cur_req)==WRITE? "writ": "read"),
668                (long)blk_rq_pos(fs->cur_req));
669         swim3_end_request(fs, -EIO, 0);
670         fs->state = idle;
671         start_request(fs);
672         spin_unlock_irqrestore(&swim3_lock, flags);
673 }
674 
675 static irqreturn_t swim3_interrupt(int irq, void *dev_id)
676 {
677         struct floppy_state *fs = (struct floppy_state *) dev_id;
678         struct swim3 __iomem *sw = fs->swim3;
679         int intr, err, n;
680         int stat, resid;
681         struct dbdma_regs __iomem *dr;
682         struct dbdma_cmd *cp;
683         unsigned long flags;
684         struct request *req = fs->cur_req;
685 
686         swim3_dbg("* interrupt, state=%d\n", fs->state);
687 
688         spin_lock_irqsave(&swim3_lock, flags);
689         intr = in_8(&sw->intr);
690         err = (intr & ERROR_INTR)? in_8(&sw->error): 0;
691         if ((intr & ERROR_INTR) && fs->state != do_transfer)
692                 swim3_err("Non-transfer error interrupt: state=%d, dir=%x, intr=%x, err=%x\n",
693                           fs->state, rq_data_dir(req), intr, err);
694         switch (fs->state) {
695         case locating:
696                 if (intr & SEEN_SECTOR) {
697                         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
698                         out_8(&sw->select, RELAX);
699                         out_8(&sw->intr_enable, 0);
700                         del_timer(&fs->timeout);
701                         fs->timeout_pending = 0;
702                         if (sw->ctrack == 0xff) {
703                                 swim3_err("%s", "Seen sector but cyl=ff?\n");
704                                 fs->cur_cyl = -1;
705                                 if (fs->retries > 5) {
706                                         swim3_end_request(fs, -EIO, 0);
707                                         fs->state = idle;
708                                         start_request(fs);
709                                 } else {
710                                         fs->state = jogging;
711                                         act(fs);
712                                 }
713                                 break;
714                         }
715                         fs->cur_cyl = sw->ctrack;
716                         fs->cur_sector = sw->csect;
717                         if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)
718                                 swim3_err("Expected cyl %d, got %d\n",
719                                           fs->expect_cyl, fs->cur_cyl);
720                         fs->state = do_transfer;
721                         act(fs);
722                 }
723                 break;
724         case seeking:
725         case jogging:
726                 if (sw->nseek == 0) {
727                         out_8(&sw->control_bic, DO_SEEK);
728                         out_8(&sw->select, RELAX);
729                         out_8(&sw->intr_enable, 0);
730                         del_timer(&fs->timeout);
731                         fs->timeout_pending = 0;
732                         if (fs->state == seeking)
733                                 ++fs->retries;
734                         fs->state = settling;
735                         act(fs);
736                 }
737                 break;
738         case settling:
739                 out_8(&sw->intr_enable, 0);
740                 del_timer(&fs->timeout);
741                 fs->timeout_pending = 0;
742                 act(fs);
743                 break;
744         case do_transfer:
745                 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0)
746                         break;
747                 out_8(&sw->intr_enable, 0);
748                 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
749                 out_8(&sw->select, RELAX);
750                 del_timer(&fs->timeout);
751                 fs->timeout_pending = 0;
752                 dr = fs->dma;
753                 cp = fs->dma_cmd;
754                 if (rq_data_dir(req) == WRITE)
755                         ++cp;
756                 /*
757                  * Check that the main data transfer has finished.
758                  * On writing, the swim3 sometimes doesn't use
759                  * up all the bytes of the postamble, so we can still
760                  * see DMA active here.  That doesn't matter as long
761                  * as all the sector data has been transferred.
762                  */
763                 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) {
764                         /* wait a little while for DMA to complete */
765                         for (n = 0; n < 100; ++n) {
766                                 if (cp->xfer_status != 0)
767                                         break;
768                                 udelay(1);
769                                 barrier();
770                         }
771                 }
772                 /* turn off DMA */
773                 out_le32(&dr->control, (RUN | PAUSE) << 16);
774                 stat = ld_le16(&cp->xfer_status);
775                 resid = ld_le16(&cp->res_count);
776                 if (intr & ERROR_INTR) {
777                         n = fs->scount - 1 - resid / 512;
778                         if (n > 0) {
779                                 blk_update_request(req, 0, n << 9);
780                                 fs->req_sector += n;
781                         }
782                         if (fs->retries < 5) {
783                                 ++fs->retries;
784                                 act(fs);
785                         } else {
786                                 swim3_err("Error %sing block %ld (err=%x)\n",
787                                        rq_data_dir(req) == WRITE? "writ": "read",
788                                        (long)blk_rq_pos(req), err);
789                                 swim3_end_request(fs, -EIO, 0);
790                                 fs->state = idle;
791                         }
792                 } else {
793                         if ((stat & ACTIVE) == 0 || resid != 0) {
794                                 /* musta been an error */
795                                 swim3_err("fd dma error: stat=%x resid=%d\n", stat, resid);
796                                 swim3_err("  state=%d, dir=%x, intr=%x, err=%x\n",
797                                           fs->state, rq_data_dir(req), intr, err);
798                                 swim3_end_request(fs, -EIO, 0);
799                                 fs->state = idle;
800                                 start_request(fs);
801                                 break;
802                         }
803                         fs->retries = 0;
804                         if (swim3_end_request(fs, 0, fs->scount << 9)) {
805                                 fs->req_sector += fs->scount;
806                                 if (fs->req_sector > fs->secpertrack) {
807                                         fs->req_sector -= fs->secpertrack;
808                                         if (++fs->head > 1) {
809                                                 fs->head = 0;
810                                                 ++fs->req_cyl;
811                                         }
812                                 }
813                                 act(fs);
814                         } else
815                                 fs->state = idle;
816                 }
817                 if (fs->state == idle)
818                         start_request(fs);
819                 break;
820         default:
821                 swim3_err("Don't know what to do in state %d\n", fs->state);
822         }
823         spin_unlock_irqrestore(&swim3_lock, flags);
824         return IRQ_HANDLED;
825 }
826 
827 /*
828 static void fd_dma_interrupt(int irq, void *dev_id)
829 {
830 }
831 */
832 
833 /* Called under the mutex to grab exclusive access to a drive */
834 static int grab_drive(struct floppy_state *fs, enum swim_state state,
835                       int interruptible)
836 {
837         unsigned long flags;
838 
839         swim3_dbg("%s", "-> grab drive\n");
840 
841         spin_lock_irqsave(&swim3_lock, flags);
842         if (fs->state != idle && fs->state != available) {
843                 ++fs->wanted;
844                 /* this will enable irqs in order to sleep */
845                 if (!interruptible)
846                         wait_event_lock_irq(fs->wait,
847                                         fs->state == available,
848                                         swim3_lock);
849                 else if (wait_event_interruptible_lock_irq(fs->wait,
850                                         fs->state == available,
851                                         swim3_lock)) {
852                         --fs->wanted;
853                         spin_unlock_irqrestore(&swim3_lock, flags);
854                         return -EINTR;
855                 }
856                 --fs->wanted;
857         }
858         fs->state = state;
859         spin_unlock_irqrestore(&swim3_lock, flags);
860 
861         return 0;
862 }
863 
864 static void release_drive(struct floppy_state *fs)
865 {
866         unsigned long flags;
867 
868         swim3_dbg("%s", "-> release drive\n");
869 
870         spin_lock_irqsave(&swim3_lock, flags);
871         fs->state = idle;
872         start_request(fs);
873         spin_unlock_irqrestore(&swim3_lock, flags);
874 }
875 
876 static int fd_eject(struct floppy_state *fs)
877 {
878         int err, n;
879 
880         err = grab_drive(fs, ejecting, 1);
881         if (err)
882                 return err;
883         swim3_action(fs, EJECT);
884         for (n = 20; n > 0; --n) {
885                 if (signal_pending(current)) {
886                         err = -EINTR;
887                         break;
888                 }
889                 swim3_select(fs, RELAX);
890                 schedule_timeout_interruptible(1);
891                 if (swim3_readbit(fs, DISK_IN) == 0)
892                         break;
893         }
894         swim3_select(fs, RELAX);
895         udelay(150);
896         fs->ejected = 1;
897         release_drive(fs);
898         return err;
899 }
900 
901 static struct floppy_struct floppy_type =
902         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL };    /*  7 1.44MB 3.5"   */
903 
904 static int floppy_locked_ioctl(struct block_device *bdev, fmode_t mode,
905                         unsigned int cmd, unsigned long param)
906 {
907         struct floppy_state *fs = bdev->bd_disk->private_data;
908         int err;
909                 
910         if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
911                 return -EPERM;
912 
913         if (fs->mdev->media_bay &&
914             check_media_bay(fs->mdev->media_bay) != MB_FD)
915                 return -ENXIO;
916 
917         switch (cmd) {
918         case FDEJECT:
919                 if (fs->ref_count != 1)
920                         return -EBUSY;
921                 err = fd_eject(fs);
922                 return err;
923         case FDGETPRM:
924                 if (copy_to_user((void __user *) param, &floppy_type,
925                                  sizeof(struct floppy_struct)))
926                         return -EFAULT;
927                 return 0;
928         }
929         return -ENOTTY;
930 }
931 
932 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
933                                  unsigned int cmd, unsigned long param)
934 {
935         int ret;
936 
937         mutex_lock(&swim3_mutex);
938         ret = floppy_locked_ioctl(bdev, mode, cmd, param);
939         mutex_unlock(&swim3_mutex);
940 
941         return ret;
942 }
943 
944 static int floppy_open(struct block_device *bdev, fmode_t mode)
945 {
946         struct floppy_state *fs = bdev->bd_disk->private_data;
947         struct swim3 __iomem *sw = fs->swim3;
948         int n, err = 0;
949 
950         if (fs->ref_count == 0) {
951                 if (fs->mdev->media_bay &&
952                     check_media_bay(fs->mdev->media_bay) != MB_FD)
953                         return -ENXIO;
954                 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2);
955                 out_8(&sw->control_bic, 0xff);
956                 out_8(&sw->mode, 0x95);
957                 udelay(10);
958                 out_8(&sw->intr_enable, 0);
959                 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
960                 swim3_action(fs, MOTOR_ON);
961                 fs->write_prot = -1;
962                 fs->cur_cyl = -1;
963                 for (n = 0; n < 2 * HZ; ++n) {
964                         if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE))
965                                 break;
966                         if (signal_pending(current)) {
967                                 err = -EINTR;
968                                 break;
969                         }
970                         swim3_select(fs, RELAX);
971                         schedule_timeout_interruptible(1);
972                 }
973                 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0
974                                  || swim3_readbit(fs, DISK_IN) == 0))
975                         err = -ENXIO;
976                 swim3_action(fs, SETMFM);
977                 swim3_select(fs, RELAX);
978 
979         } else if (fs->ref_count == -1 || mode & FMODE_EXCL)
980                 return -EBUSY;
981 
982         if (err == 0 && (mode & FMODE_NDELAY) == 0
983             && (mode & (FMODE_READ|FMODE_WRITE))) {
984                 check_disk_change(bdev);
985                 if (fs->ejected)
986                         err = -ENXIO;
987         }
988 
989         if (err == 0 && (mode & FMODE_WRITE)) {
990                 if (fs->write_prot < 0)
991                         fs->write_prot = swim3_readbit(fs, WRITE_PROT);
992                 if (fs->write_prot)
993                         err = -EROFS;
994         }
995 
996         if (err) {
997                 if (fs->ref_count == 0) {
998                         swim3_action(fs, MOTOR_OFF);
999                         out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE);
1000                         swim3_select(fs, RELAX);
1001                 }
1002                 return err;
1003         }
1004 
1005         if (mode & FMODE_EXCL)
1006                 fs->ref_count = -1;
1007         else
1008                 ++fs->ref_count;
1009 
1010         return 0;
1011 }
1012 
1013 static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
1014 {
1015         int ret;
1016 
1017         mutex_lock(&swim3_mutex);
1018         ret = floppy_open(bdev, mode);
1019         mutex_unlock(&swim3_mutex);
1020 
1021         return ret;
1022 }
1023 
1024 static void floppy_release(struct gendisk *disk, fmode_t mode)
1025 {
1026         struct floppy_state *fs = disk->private_data;
1027         struct swim3 __iomem *sw = fs->swim3;
1028 
1029         mutex_lock(&swim3_mutex);
1030         if (fs->ref_count > 0 && --fs->ref_count == 0) {
1031                 swim3_action(fs, MOTOR_OFF);
1032                 out_8(&sw->control_bic, 0xff);
1033                 swim3_select(fs, RELAX);
1034         }
1035         mutex_unlock(&swim3_mutex);
1036 }
1037 
1038 static unsigned int floppy_check_events(struct gendisk *disk,
1039                                         unsigned int clearing)
1040 {
1041         struct floppy_state *fs = disk->private_data;
1042         return fs->ejected ? DISK_EVENT_MEDIA_CHANGE : 0;
1043 }
1044 
1045 static int floppy_revalidate(struct gendisk *disk)
1046 {
1047         struct floppy_state *fs = disk->private_data;
1048         struct swim3 __iomem *sw;
1049         int ret, n;
1050 
1051         if (fs->mdev->media_bay &&
1052             check_media_bay(fs->mdev->media_bay) != MB_FD)
1053                 return -ENXIO;
1054 
1055         sw = fs->swim3;
1056         grab_drive(fs, revalidating, 0);
1057         out_8(&sw->intr_enable, 0);
1058         out_8(&sw->control_bis, DRIVE_ENABLE);
1059         swim3_action(fs, MOTOR_ON);     /* necessary? */
1060         fs->write_prot = -1;
1061         fs->cur_cyl = -1;
1062         mdelay(1);
1063         for (n = HZ; n > 0; --n) {
1064                 if (swim3_readbit(fs, SEEK_COMPLETE))
1065                         break;
1066                 if (signal_pending(current))
1067                         break;
1068                 swim3_select(fs, RELAX);
1069                 schedule_timeout_interruptible(1);
1070         }
1071         ret = swim3_readbit(fs, SEEK_COMPLETE) == 0
1072                 || swim3_readbit(fs, DISK_IN) == 0;
1073         if (ret)
1074                 swim3_action(fs, MOTOR_OFF);
1075         else {
1076                 fs->ejected = 0;
1077                 swim3_action(fs, SETMFM);
1078         }
1079         swim3_select(fs, RELAX);
1080 
1081         release_drive(fs);
1082         return ret;
1083 }
1084 
1085 static const struct block_device_operations floppy_fops = {
1086         .open           = floppy_unlocked_open,
1087         .release        = floppy_release,
1088         .ioctl          = floppy_ioctl,
1089         .check_events   = floppy_check_events,
1090         .revalidate_disk= floppy_revalidate,
1091 };
1092 
1093 static void swim3_mb_event(struct macio_dev* mdev, int mb_state)
1094 {
1095         struct floppy_state *fs = macio_get_drvdata(mdev);
1096         struct swim3 __iomem *sw;
1097 
1098         if (!fs)
1099                 return;
1100 
1101         sw = fs->swim3;
1102 
1103         if (mb_state != MB_FD)
1104                 return;
1105 
1106         /* Clear state */
1107         out_8(&sw->intr_enable, 0);
1108         in_8(&sw->intr);
1109         in_8(&sw->error);
1110 }
1111 
1112 static int swim3_add_device(struct macio_dev *mdev, int index)
1113 {
1114         struct device_node *swim = mdev->ofdev.dev.of_node;
1115         struct floppy_state *fs = &floppy_states[index];
1116         int rc = -EBUSY;
1117 
1118         /* Do this first for message macros */
1119         memset(fs, 0, sizeof(*fs));
1120         fs->mdev = mdev;
1121         fs->index = index;
1122 
1123         /* Check & Request resources */
1124         if (macio_resource_count(mdev) < 2) {
1125                 swim3_err("%s", "No address in device-tree\n");
1126                 return -ENXIO;
1127         }
1128         if (macio_irq_count(mdev) < 1) {
1129                 swim3_err("%s", "No interrupt in device-tree\n");
1130                 return -ENXIO;
1131         }
1132         if (macio_request_resource(mdev, 0, "swim3 (mmio)")) {
1133                 swim3_err("%s", "Can't request mmio resource\n");
1134                 return -EBUSY;
1135         }
1136         if (macio_request_resource(mdev, 1, "swim3 (dma)")) {
1137                 swim3_err("%s", "Can't request dma resource\n");
1138                 macio_release_resource(mdev, 0);
1139                 return -EBUSY;
1140         }
1141         dev_set_drvdata(&mdev->ofdev.dev, fs);
1142 
1143         if (mdev->media_bay == NULL)
1144                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);
1145         
1146         fs->state = idle;
1147         fs->swim3 = (struct swim3 __iomem *)
1148                 ioremap(macio_resource_start(mdev, 0), 0x200);
1149         if (fs->swim3 == NULL) {
1150                 swim3_err("%s", "Couldn't map mmio registers\n");
1151                 rc = -ENOMEM;
1152                 goto out_release;
1153         }
1154         fs->dma = (struct dbdma_regs __iomem *)
1155                 ioremap(macio_resource_start(mdev, 1), 0x200);
1156         if (fs->dma == NULL) {
1157                 swim3_err("%s", "Couldn't map dma registers\n");
1158                 iounmap(fs->swim3);
1159                 rc = -ENOMEM;
1160                 goto out_release;
1161         }
1162         fs->swim3_intr = macio_irq(mdev, 0);
1163         fs->dma_intr = macio_irq(mdev, 1);
1164         fs->cur_cyl = -1;
1165         fs->cur_sector = -1;
1166         fs->secpercyl = 36;
1167         fs->secpertrack = 18;
1168         fs->total_secs = 2880;
1169         init_waitqueue_head(&fs->wait);
1170 
1171         fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);
1172         memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));
1173         st_le16(&fs->dma_cmd[1].command, DBDMA_STOP);
1174 
1175         if (mdev->media_bay == NULL || check_media_bay(mdev->media_bay) == MB_FD)
1176                 swim3_mb_event(mdev, MB_FD);
1177 
1178         if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {
1179                 swim3_err("%s", "Couldn't request interrupt\n");
1180                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1181                 goto out_unmap;
1182                 return -EBUSY;
1183         }
1184 
1185         init_timer(&fs->timeout);
1186 
1187         swim3_info("SWIM3 floppy controller %s\n",
1188                 mdev->media_bay ? "in media bay" : "");
1189 
1190         return 0;
1191 
1192  out_unmap:
1193         iounmap(fs->dma);
1194         iounmap(fs->swim3);
1195 
1196  out_release:
1197         macio_release_resource(mdev, 0);
1198         macio_release_resource(mdev, 1);
1199 
1200         return rc;
1201 }
1202 
1203 static int swim3_attach(struct macio_dev *mdev,
1204                         const struct of_device_id *match)
1205 {
1206         struct gendisk *disk;
1207         int index, rc;
1208 
1209         index = floppy_count++;
1210         if (index >= MAX_FLOPPIES)
1211                 return -ENXIO;
1212 
1213         /* Add the drive */
1214         rc = swim3_add_device(mdev, index);
1215         if (rc)
1216                 return rc;
1217         /* Now register that disk. Same comment about failure handling */
1218         disk = disks[index] = alloc_disk(1);
1219         if (disk == NULL)
1220                 return -ENOMEM;
1221         disk->queue = blk_init_queue(do_fd_request, &swim3_lock);
1222         if (disk->queue == NULL) {
1223                 put_disk(disk);
1224                 return -ENOMEM;
1225         }
1226         disk->queue->queuedata = &floppy_states[index];
1227 
1228         if (index == 0) {
1229                 /* If we failed, there isn't much we can do as the driver is still
1230                  * too dumb to remove the device, just bail out
1231                  */
1232                 if (register_blkdev(FLOPPY_MAJOR, "fd"))
1233                         return 0;
1234         }
1235 
1236         disk->major = FLOPPY_MAJOR;
1237         disk->first_minor = index;
1238         disk->fops = &floppy_fops;
1239         disk->private_data = &floppy_states[index];
1240         disk->flags |= GENHD_FL_REMOVABLE;
1241         sprintf(disk->disk_name, "fd%d", index);
1242         set_capacity(disk, 2880);
1243         add_disk(disk);
1244 
1245         return 0;
1246 }
1247 
1248 static struct of_device_id swim3_match[] =
1249 {
1250         {
1251         .name           = "swim3",
1252         },
1253         {
1254         .compatible     = "ohare-swim3"
1255         },
1256         {
1257         .compatible     = "swim3"
1258         },
1259         { /* end of list */ }
1260 };
1261 
1262 static struct macio_driver swim3_driver =
1263 {
1264         .driver = {
1265                 .name           = "swim3",
1266                 .of_match_table = swim3_match,
1267         },
1268         .probe          = swim3_attach,
1269 #ifdef CONFIG_PMAC_MEDIABAY
1270         .mediabay_event = swim3_mb_event,
1271 #endif
1272 #if 0
1273         .suspend        = swim3_suspend,
1274         .resume         = swim3_resume,
1275 #endif
1276 };
1277 
1278 
1279 int swim3_init(void)
1280 {
1281         macio_register_driver(&swim3_driver);
1282         return 0;
1283 }
1284 
1285 module_init(swim3_init)
1286 
1287 MODULE_LICENSE("GPL");
1288 MODULE_AUTHOR("Paul Mackerras");
1289 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);
1290 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us