aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/mmc/wbsd.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/mmc/wbsd.c
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/mmc/wbsd.c')
-rw-r--r--drivers/mmc/wbsd.c1651
1 files changed, 1651 insertions, 0 deletions
diff --git a/drivers/mmc/wbsd.c b/drivers/mmc/wbsd.c
new file mode 100644
index 00000000000..938bca0414e
--- /dev/null
+++ b/drivers/mmc/wbsd.c
@@ -0,0 +1,1651 @@
1/*
2 * linux/drivers/mmc/wbsd.c - Winbond W83L51xD SD/MMC driver
3 *
4 * Copyright (C) 2004-2005 Pierre Ossman, All Rights Reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 *
11 * Warning!
12 *
13 * Changes to the FIFO system should be done with extreme care since
14 * the hardware is full of bugs related to the FIFO. Known issues are:
15 *
16 * - FIFO size field in FSR is always zero.
17 *
18 * - FIFO interrupts tend not to work as they should. Interrupts are
19 * triggered only for full/empty events, not for threshold values.
20 *
21 * - On APIC systems the FIFO empty interrupt is sometimes lost.
22 */
23
24#include <linux/config.h>
25#include <linux/module.h>
26#include <linux/moduleparam.h>
27#include <linux/init.h>
28#include <linux/ioport.h>
29#include <linux/device.h>
30#include <linux/interrupt.h>
31#include <linux/delay.h>
32#include <linux/highmem.h>
33#include <linux/mmc/host.h>
34#include <linux/mmc/protocol.h>
35
36#include <asm/io.h>
37#include <asm/dma.h>
38#include <asm/scatterlist.h>
39
40#include "wbsd.h"
41
42#define DRIVER_NAME "wbsd"
43#define DRIVER_VERSION "1.1"
44
45#ifdef CONFIG_MMC_DEBUG
46#define DBG(x...) \
47 printk(KERN_DEBUG DRIVER_NAME ": " x)
48#define DBGF(f, x...) \
49 printk(KERN_DEBUG DRIVER_NAME " [%s()]: " f, __func__ , ##x)
50#else
51#define DBG(x...) do { } while (0)
52#define DBGF(x...) do { } while (0)
53#endif
54
55static unsigned int io = 0x248;
56static unsigned int irq = 6;
57static int dma = 2;
58
59#ifdef CONFIG_MMC_DEBUG
60void DBG_REG(int reg, u8 value)
61{
62 int i;
63
64 printk(KERN_DEBUG "wbsd: Register %d: 0x%02X %3d '%c' ",
65 reg, (int)value, (int)value, (value < 0x20)?'.':value);
66
67 for (i = 7;i >= 0;i--)
68 {
69 if (value & (1 << i))
70 printk("x");
71 else
72 printk(".");
73 }
74
75 printk("\n");
76}
77#else
78#define DBG_REG(r, v) do {} while (0)
79#endif
80
81/*
82 * Basic functions
83 */
84
85static inline void wbsd_unlock_config(struct wbsd_host* host)
86{
87 outb(host->unlock_code, host->config);
88 outb(host->unlock_code, host->config);
89}
90
91static inline void wbsd_lock_config(struct wbsd_host* host)
92{
93 outb(LOCK_CODE, host->config);
94}
95
96static inline void wbsd_write_config(struct wbsd_host* host, u8 reg, u8 value)
97{
98 outb(reg, host->config);
99 outb(value, host->config + 1);
100}
101
102static inline u8 wbsd_read_config(struct wbsd_host* host, u8 reg)
103{
104 outb(reg, host->config);
105 return inb(host->config + 1);
106}
107
108static inline void wbsd_write_index(struct wbsd_host* host, u8 index, u8 value)
109{
110 outb(index, host->base + WBSD_IDXR);
111 outb(value, host->base + WBSD_DATAR);
112}
113
114static inline u8 wbsd_read_index(struct wbsd_host* host, u8 index)
115{
116 outb(index, host->base + WBSD_IDXR);
117 return inb(host->base + WBSD_DATAR);
118}
119
120/*
121 * Common routines
122 */
123
124static void wbsd_init_device(struct wbsd_host* host)
125{
126 u8 setup, ier;
127
128 /*
129 * Reset chip (SD/MMC part) and fifo.
130 */
131 setup = wbsd_read_index(host, WBSD_IDX_SETUP);
132 setup |= WBSD_FIFO_RESET | WBSD_SOFT_RESET;
133 wbsd_write_index(host, WBSD_IDX_SETUP, setup);
134
135 /*
136 * Read back default clock.
137 */
138 host->clk = wbsd_read_index(host, WBSD_IDX_CLK);
139
140 /*
141 * Power down port.
142 */
143 outb(WBSD_POWER_N, host->base + WBSD_CSR);
144
145 /*
146 * Set maximum timeout.
147 */
148 wbsd_write_index(host, WBSD_IDX_TAAC, 0x7F);
149
150 /*
151 * Enable interesting interrupts.
152 */
153 ier = 0;
154 ier |= WBSD_EINT_CARD;
155 ier |= WBSD_EINT_FIFO_THRE;
156 ier |= WBSD_EINT_CCRC;
157 ier |= WBSD_EINT_TIMEOUT;
158 ier |= WBSD_EINT_CRC;
159 ier |= WBSD_EINT_TC;
160
161 outb(ier, host->base + WBSD_EIR);
162
163 /*
164 * Clear interrupts.
165 */
166 inb(host->base + WBSD_ISR);
167}
168
169static void wbsd_reset(struct wbsd_host* host)
170{
171 u8 setup;
172
173 printk(KERN_ERR DRIVER_NAME ": Resetting chip\n");
174
175 /*
176 * Soft reset of chip (SD/MMC part).
177 */
178 setup = wbsd_read_index(host, WBSD_IDX_SETUP);
179 setup |= WBSD_SOFT_RESET;
180 wbsd_write_index(host, WBSD_IDX_SETUP, setup);
181}
182
183static void wbsd_request_end(struct wbsd_host* host, struct mmc_request* mrq)
184{
185 unsigned long dmaflags;
186
187 DBGF("Ending request, cmd (%x)\n", mrq->cmd->opcode);
188
189 if (host->dma >= 0)
190 {
191 /*
192 * Release ISA DMA controller.
193 */
194 dmaflags = claim_dma_lock();
195 disable_dma(host->dma);
196 clear_dma_ff(host->dma);
197 release_dma_lock(dmaflags);
198
199 /*
200 * Disable DMA on host.
201 */
202 wbsd_write_index(host, WBSD_IDX_DMA, 0);
203 }
204
205 host->mrq = NULL;
206
207 /*
208 * MMC layer might call back into the driver so first unlock.
209 */
210 spin_unlock(&host->lock);
211 mmc_request_done(host->mmc, mrq);
212 spin_lock(&host->lock);
213}
214
215/*
216 * Scatter/gather functions
217 */
218
219static inline void wbsd_init_sg(struct wbsd_host* host, struct mmc_data* data)
220{
221 /*
222 * Get info. about SG list from data structure.
223 */
224 host->cur_sg = data->sg;
225 host->num_sg = data->sg_len;
226
227 host->offset = 0;
228 host->remain = host->cur_sg->length;
229}
230
231static inline int wbsd_next_sg(struct wbsd_host* host)
232{
233 /*
234 * Skip to next SG entry.
235 */
236 host->cur_sg++;
237 host->num_sg--;
238
239 /*
240 * Any entries left?
241 */
242 if (host->num_sg > 0)
243 {
244 host->offset = 0;
245 host->remain = host->cur_sg->length;
246 }
247
248 return host->num_sg;
249}
250
251static inline char* wbsd_kmap_sg(struct wbsd_host* host)
252{
253 host->mapped_sg = kmap_atomic(host->cur_sg->page, KM_BIO_SRC_IRQ) +
254 host->cur_sg->offset;
255 return host->mapped_sg;
256}
257
258static inline void wbsd_kunmap_sg(struct wbsd_host* host)
259{
260 kunmap_atomic(host->mapped_sg, KM_BIO_SRC_IRQ);
261}
262
263static inline void wbsd_sg_to_dma(struct wbsd_host* host, struct mmc_data* data)
264{
265 unsigned int len, i, size;
266 struct scatterlist* sg;
267 char* dmabuf = host->dma_buffer;
268 char* sgbuf;
269
270 size = host->size;
271
272 sg = data->sg;
273 len = data->sg_len;
274
275 /*
276 * Just loop through all entries. Size might not
277 * be the entire list though so make sure that
278 * we do not transfer too much.
279 */
280 for (i = 0;i < len;i++)
281 {
282 sgbuf = kmap_atomic(sg[i].page, KM_BIO_SRC_IRQ) + sg[i].offset;
283 if (size < sg[i].length)
284 memcpy(dmabuf, sgbuf, size);
285 else
286 memcpy(dmabuf, sgbuf, sg[i].length);
287 kunmap_atomic(sgbuf, KM_BIO_SRC_IRQ);
288 dmabuf += sg[i].length;
289
290 if (size < sg[i].length)
291 size = 0;
292 else
293 size -= sg[i].length;
294
295 if (size == 0)
296 break;
297 }
298
299 /*
300 * Check that we didn't get a request to transfer
301 * more data than can fit into the SG list.
302 */
303
304 BUG_ON(size != 0);
305
306 host->size -= size;
307}
308
309static inline void wbsd_dma_to_sg(struct wbsd_host* host, struct mmc_data* data)
310{
311 unsigned int len, i, size;
312 struct scatterlist* sg;
313 char* dmabuf = host->dma_buffer;
314 char* sgbuf;
315
316 size = host->size;
317
318 sg = data->sg;
319 len = data->sg_len;
320
321 /*
322 * Just loop through all entries. Size might not
323 * be the entire list though so make sure that
324 * we do not transfer too much.
325 */
326 for (i = 0;i < len;i++)
327 {
328 sgbuf = kmap_atomic(sg[i].page, KM_BIO_SRC_IRQ) + sg[i].offset;
329 if (size < sg[i].length)
330 memcpy(sgbuf, dmabuf, size);
331 else
332 memcpy(sgbuf, dmabuf, sg[i].length);
333 kunmap_atomic(sgbuf, KM_BIO_SRC_IRQ);
334 dmabuf += sg[i].length;
335
336 if (size < sg[i].length)
337 size = 0;
338 else
339 size -= sg[i].length;
340
341 if (size == 0)
342 break;
343 }
344
345 /*
346 * Check that we didn't get a request to transfer
347 * more data than can fit into the SG list.
348 */
349
350 BUG_ON(size != 0);
351
352 host->size -= size;
353}
354
355/*
356 * Command handling
357 */
358
359static inline void wbsd_get_short_reply(struct wbsd_host* host,
360 struct mmc_command* cmd)
361{
362 /*
363 * Correct response type?
364 */
365 if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_SHORT)
366 {
367 cmd->error = MMC_ERR_INVALID;
368 return;
369 }
370
371 cmd->resp[0] =
372 wbsd_read_index(host, WBSD_IDX_RESP12) << 24;
373 cmd->resp[0] |=
374 wbsd_read_index(host, WBSD_IDX_RESP13) << 16;
375 cmd->resp[0] |=
376 wbsd_read_index(host, WBSD_IDX_RESP14) << 8;
377 cmd->resp[0] |=
378 wbsd_read_index(host, WBSD_IDX_RESP15) << 0;
379 cmd->resp[1] =
380 wbsd_read_index(host, WBSD_IDX_RESP16) << 24;
381}
382
383static inline void wbsd_get_long_reply(struct wbsd_host* host,
384 struct mmc_command* cmd)
385{
386 int i;
387
388 /*
389 * Correct response type?
390 */
391 if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_LONG)
392 {
393 cmd->error = MMC_ERR_INVALID;
394 return;
395 }
396
397 for (i = 0;i < 4;i++)
398 {
399 cmd->resp[i] =
400 wbsd_read_index(host, WBSD_IDX_RESP1 + i * 4) << 24;
401 cmd->resp[i] |=
402 wbsd_read_index(host, WBSD_IDX_RESP2 + i * 4) << 16;
403 cmd->resp[i] |=
404 wbsd_read_index(host, WBSD_IDX_RESP3 + i * 4) << 8;
405 cmd->resp[i] |=
406 wbsd_read_index(host, WBSD_IDX_RESP4 + i * 4) << 0;
407 }
408}
409
410static irqreturn_t wbsd_irq(int irq, void *dev_id, struct pt_regs *regs);
411
412static void wbsd_send_command(struct wbsd_host* host, struct mmc_command* cmd)
413{
414 int i;
415 u8 status, isr;
416
417 DBGF("Sending cmd (%x)\n", cmd->opcode);
418
419 /*
420 * Clear accumulated ISR. The interrupt routine
421 * will fill this one with events that occur during
422 * transfer.
423 */
424 host->isr = 0;
425
426 /*
427 * Send the command (CRC calculated by host).
428 */
429 outb(cmd->opcode, host->base + WBSD_CMDR);
430 for (i = 3;i >= 0;i--)
431 outb((cmd->arg >> (i * 8)) & 0xff, host->base + WBSD_CMDR);
432
433 cmd->error = MMC_ERR_NONE;
434
435 /*
436 * Wait for the request to complete.
437 */
438 do {
439 status = wbsd_read_index(host, WBSD_IDX_STATUS);
440 } while (status & WBSD_CARDTRAFFIC);
441
442 /*
443 * Do we expect a reply?
444 */
445 if ((cmd->flags & MMC_RSP_MASK) != MMC_RSP_NONE)
446 {
447 /*
448 * Read back status.
449 */
450 isr = host->isr;
451
452 /* Card removed? */
453 if (isr & WBSD_INT_CARD)
454 cmd->error = MMC_ERR_TIMEOUT;
455 /* Timeout? */
456 else if (isr & WBSD_INT_TIMEOUT)
457 cmd->error = MMC_ERR_TIMEOUT;
458 /* CRC? */
459 else if ((cmd->flags & MMC_RSP_CRC) && (isr & WBSD_INT_CRC))
460 cmd->error = MMC_ERR_BADCRC;
461 /* All ok */
462 else
463 {
464 if ((cmd->flags & MMC_RSP_MASK) == MMC_RSP_SHORT)
465 wbsd_get_short_reply(host, cmd);
466 else
467 wbsd_get_long_reply(host, cmd);
468 }
469 }
470
471 DBGF("Sent cmd (%x), res %d\n", cmd->opcode, cmd->error);
472}
473
474/*
475 * Data functions
476 */
477
478static void wbsd_empty_fifo(struct wbsd_host* host)
479{
480 struct mmc_data* data = host->mrq->cmd->data;
481 char* buffer;
482 int i, fsr, fifo;
483
484 /*
485 * Handle excessive data.
486 */
487 if (data->bytes_xfered == host->size)
488 return;
489
490 buffer = wbsd_kmap_sg(host) + host->offset;
491
492 /*
493 * Drain the fifo. This has a tendency to loop longer
494 * than the FIFO length (usually one block).
495 */
496 while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_EMPTY))
497 {
498 /*
499 * The size field in the FSR is broken so we have to
500 * do some guessing.
501 */
502 if (fsr & WBSD_FIFO_FULL)
503 fifo = 16;
504 else if (fsr & WBSD_FIFO_FUTHRE)
505 fifo = 8;
506 else
507 fifo = 1;
508
509 for (i = 0;i < fifo;i++)
510 {
511 *buffer = inb(host->base + WBSD_DFR);
512 buffer++;
513 host->offset++;
514 host->remain--;
515
516 data->bytes_xfered++;
517
518 /*
519 * Transfer done?
520 */
521 if (data->bytes_xfered == host->size)
522 {
523 wbsd_kunmap_sg(host);
524 return;
525 }
526
527 /*
528 * End of scatter list entry?
529 */
530 if (host->remain == 0)
531 {
532 wbsd_kunmap_sg(host);
533
534 /*
535 * Get next entry. Check if last.
536 */
537 if (!wbsd_next_sg(host))
538 {
539 /*
540 * We should never reach this point.
541 * It means that we're trying to
542 * transfer more blocks than can fit
543 * into the scatter list.
544 */
545 BUG_ON(1);
546
547 host->size = data->bytes_xfered;
548
549 return;
550 }
551
552 buffer = wbsd_kmap_sg(host);
553 }
554 }
555 }
556
557 wbsd_kunmap_sg(host);
558
559 /*
560 * This is a very dirty hack to solve a
561 * hardware problem. The chip doesn't trigger
562 * FIFO threshold interrupts properly.
563 */
564 if ((host->size - data->bytes_xfered) < 16)
565 tasklet_schedule(&host->fifo_tasklet);
566}
567
568static void wbsd_fill_fifo(struct wbsd_host* host)
569{
570 struct mmc_data* data = host->mrq->cmd->data;
571 char* buffer;
572 int i, fsr, fifo;
573
574 /*
575 * Check that we aren't being called after the
576 * entire buffer has been transfered.
577 */
578 if (data->bytes_xfered == host->size)
579 return;
580
581 buffer = wbsd_kmap_sg(host) + host->offset;
582
583 /*
584 * Fill the fifo. This has a tendency to loop longer
585 * than the FIFO length (usually one block).
586 */
587 while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_FULL))
588 {
589 /*
590 * The size field in the FSR is broken so we have to
591 * do some guessing.
592 */
593 if (fsr & WBSD_FIFO_EMPTY)
594 fifo = 0;
595 else if (fsr & WBSD_FIFO_EMTHRE)
596 fifo = 8;
597 else
598 fifo = 15;
599
600 for (i = 16;i > fifo;i--)
601 {
602 outb(*buffer, host->base + WBSD_DFR);
603 buffer++;
604 host->offset++;
605 host->remain--;
606
607 data->bytes_xfered++;
608
609 /*
610 * Transfer done?
611 */
612 if (data->bytes_xfered == host->size)
613 {
614 wbsd_kunmap_sg(host);
615 return;
616 }
617
618 /*
619 * End of scatter list entry?
620 */
621 if (host->remain == 0)
622 {
623 wbsd_kunmap_sg(host);
624
625 /*
626 * Get next entry. Check if last.
627 */
628 if (!wbsd_next_sg(host))
629 {
630 /*
631 * We should never reach this point.
632 * It means that we're trying to
633 * transfer more blocks than can fit
634 * into the scatter list.
635 */
636 BUG_ON(1);
637
638 host->size = data->bytes_xfered;
639
640 return;
641 }
642
643 buffer = wbsd_kmap_sg(host);
644 }
645 }
646 }
647
648 wbsd_kunmap_sg(host);
649}
650
651static void wbsd_prepare_data(struct wbsd_host* host, struct mmc_data* data)
652{
653 u16 blksize;
654 u8 setup;
655 unsigned long dmaflags;
656
657 DBGF("blksz %04x blks %04x flags %08x\n",
658 1 << data->blksz_bits, data->blocks, data->flags);
659 DBGF("tsac %d ms nsac %d clk\n",
660 data->timeout_ns / 1000000, data->timeout_clks);
661
662 /*
663 * Calculate size.
664 */
665 host->size = data->blocks << data->blksz_bits;
666
667 /*
668 * Check timeout values for overflow.
669 * (Yes, some cards cause this value to overflow).
670 */
671 if (data->timeout_ns > 127000000)
672 wbsd_write_index(host, WBSD_IDX_TAAC, 127);
673 else
674 wbsd_write_index(host, WBSD_IDX_TAAC, data->timeout_ns/1000000);
675
676 if (data->timeout_clks > 255)
677 wbsd_write_index(host, WBSD_IDX_NSAC, 255);
678 else
679 wbsd_write_index(host, WBSD_IDX_NSAC, data->timeout_clks);
680
681 /*
682 * Inform the chip of how large blocks will be
683 * sent. It needs this to determine when to
684 * calculate CRC.
685 *
686 * Space for CRC must be included in the size.
687 */
688 blksize = (1 << data->blksz_bits) + 2;
689
690 wbsd_write_index(host, WBSD_IDX_PBSMSB, (blksize >> 4) & 0xF0);
691 wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
692
693 /*
694 * Clear the FIFO. This is needed even for DMA
695 * transfers since the chip still uses the FIFO
696 * internally.
697 */
698 setup = wbsd_read_index(host, WBSD_IDX_SETUP);
699 setup |= WBSD_FIFO_RESET;
700 wbsd_write_index(host, WBSD_IDX_SETUP, setup);
701
702 /*
703 * DMA transfer?
704 */
705 if (host->dma >= 0)
706 {
707 /*
708 * The buffer for DMA is only 64 kB.
709 */
710 BUG_ON(host->size > 0x10000);
711 if (host->size > 0x10000)
712 {
713 data->error = MMC_ERR_INVALID;
714 return;
715 }
716
717 /*
718 * Transfer data from the SG list to
719 * the DMA buffer.
720 */
721 if (data->flags & MMC_DATA_WRITE)
722 wbsd_sg_to_dma(host, data);
723
724 /*
725 * Initialise the ISA DMA controller.
726 */
727 dmaflags = claim_dma_lock();
728 disable_dma(host->dma);
729 clear_dma_ff(host->dma);
730 if (data->flags & MMC_DATA_READ)
731 set_dma_mode(host->dma, DMA_MODE_READ & ~0x40);
732 else
733 set_dma_mode(host->dma, DMA_MODE_WRITE & ~0x40);
734 set_dma_addr(host->dma, host->dma_addr);
735 set_dma_count(host->dma, host->size);
736
737 enable_dma(host->dma);
738 release_dma_lock(dmaflags);
739
740 /*
741 * Enable DMA on the host.
742 */
743 wbsd_write_index(host, WBSD_IDX_DMA, WBSD_DMA_ENABLE);
744 }
745 else
746 {
747 /*
748 * This flag is used to keep printk
749 * output to a minimum.
750 */
751 host->firsterr = 1;
752
753 /*
754 * Initialise the SG list.
755 */
756 wbsd_init_sg(host, data);
757
758 /*
759 * Turn off DMA.
760 */
761 wbsd_write_index(host, WBSD_IDX_DMA, 0);
762
763 /*
764 * Set up FIFO threshold levels (and fill
765 * buffer if doing a write).
766 */
767 if (data->flags & MMC_DATA_READ)
768 {
769 wbsd_write_index(host, WBSD_IDX_FIFOEN,
770 WBSD_FIFOEN_FULL | 8);
771 }
772 else
773 {
774 wbsd_write_index(host, WBSD_IDX_FIFOEN,
775 WBSD_FIFOEN_EMPTY | 8);
776 wbsd_fill_fifo(host);
777 }
778 }
779
780 data->error = MMC_ERR_NONE;
781}
782
783static void wbsd_finish_data(struct wbsd_host* host, struct mmc_data* data)
784{
785 unsigned long dmaflags;
786 int count;
787 u8 status;
788
789 WARN_ON(host->mrq == NULL);
790
791 /*
792 * Send a stop command if needed.
793 */
794 if (data->stop)
795 wbsd_send_command(host, data->stop);
796
797 /*
798 * Wait for the controller to leave data
799 * transfer state.
800 */
801 do
802 {
803 status = wbsd_read_index(host, WBSD_IDX_STATUS);
804 } while (status & (WBSD_BLOCK_READ | WBSD_BLOCK_WRITE));
805
806 /*
807 * DMA transfer?
808 */
809 if (host->dma >= 0)
810 {
811 /*
812 * Disable DMA on the host.
813 */
814 wbsd_write_index(host, WBSD_IDX_DMA, 0);
815
816 /*
817 * Turn of ISA DMA controller.
818 */
819 dmaflags = claim_dma_lock();
820 disable_dma(host->dma);
821 clear_dma_ff(host->dma);
822 count = get_dma_residue(host->dma);
823 release_dma_lock(dmaflags);
824
825 /*
826 * Any leftover data?
827 */
828 if (count)
829 {
830 printk(KERN_ERR DRIVER_NAME ": Incomplete DMA "
831 "transfer. %d bytes left.\n", count);
832
833 data->error = MMC_ERR_FAILED;
834 }
835 else
836 {
837 /*
838 * Transfer data from DMA buffer to
839 * SG list.
840 */
841 if (data->flags & MMC_DATA_READ)
842 wbsd_dma_to_sg(host, data);
843
844 data->bytes_xfered = host->size;
845 }
846 }
847
848 DBGF("Ending data transfer (%d bytes)\n", data->bytes_xfered);
849
850 wbsd_request_end(host, host->mrq);
851}
852
853/*
854 * MMC Callbacks
855 */
856
857static void wbsd_request(struct mmc_host* mmc, struct mmc_request* mrq)
858{
859 struct wbsd_host* host = mmc_priv(mmc);
860 struct mmc_command* cmd;
861
862 /*
863 * Disable tasklets to avoid a deadlock.
864 */
865 spin_lock_bh(&host->lock);
866
867 BUG_ON(host->mrq != NULL);
868
869 cmd = mrq->cmd;
870
871 host->mrq = mrq;
872
873 /*
874 * If there is no card in the slot then
875 * timeout immediatly.
876 */
877 if (!(inb(host->base + WBSD_CSR) & WBSD_CARDPRESENT))
878 {
879 cmd->error = MMC_ERR_TIMEOUT;
880 goto done;
881 }
882
883 /*
884 * Does the request include data?
885 */
886 if (cmd->data)
887 {
888 wbsd_prepare_data(host, cmd->data);
889
890 if (cmd->data->error != MMC_ERR_NONE)
891 goto done;
892 }
893
894 wbsd_send_command(host, cmd);
895
896 /*
897 * If this is a data transfer the request
898 * will be finished after the data has
899 * transfered.
900 */
901 if (cmd->data && (cmd->error == MMC_ERR_NONE))
902 {
903 /*
904 * Dirty fix for hardware bug.
905 */
906 if (host->dma == -1)
907 tasklet_schedule(&host->fifo_tasklet);
908
909 spin_unlock_bh(&host->lock);
910
911 return;
912 }
913
914done:
915 wbsd_request_end(host, mrq);
916
917 spin_unlock_bh(&host->lock);
918}
919
920static void wbsd_set_ios(struct mmc_host* mmc, struct mmc_ios* ios)
921{
922 struct wbsd_host* host = mmc_priv(mmc);
923 u8 clk, setup, pwr;
924
925 DBGF("clock %uHz busmode %u powermode %u Vdd %u\n",
926 ios->clock, ios->bus_mode, ios->power_mode, ios->vdd);
927
928 spin_lock_bh(&host->lock);
929
930 /*
931 * Reset the chip on each power off.
932 * Should clear out any weird states.
933 */
934 if (ios->power_mode == MMC_POWER_OFF)
935 wbsd_init_device(host);
936
937 if (ios->clock >= 24000000)
938 clk = WBSD_CLK_24M;
939 else if (ios->clock >= 16000000)
940 clk = WBSD_CLK_16M;
941 else if (ios->clock >= 12000000)
942 clk = WBSD_CLK_12M;
943 else
944 clk = WBSD_CLK_375K;
945
946 /*
947 * Only write to the clock register when
948 * there is an actual change.
949 */
950 if (clk != host->clk)
951 {
952 wbsd_write_index(host, WBSD_IDX_CLK, clk);
953 host->clk = clk;
954 }
955
956 if (ios->power_mode != MMC_POWER_OFF)
957 {
958 /*
959 * Power up card.
960 */
961 pwr = inb(host->base + WBSD_CSR);
962 pwr &= ~WBSD_POWER_N;
963 outb(pwr, host->base + WBSD_CSR);
964
965 /*
966 * This behaviour is stolen from the
967 * Windows driver. Don't know why, but
968 * it is needed.
969 */
970 setup = wbsd_read_index(host, WBSD_IDX_SETUP);
971 if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
972 setup |= WBSD_DAT3_H;
973 else
974 setup &= ~WBSD_DAT3_H;
975 wbsd_write_index(host, WBSD_IDX_SETUP, setup);
976
977 mdelay(1);
978 }
979
980 spin_unlock_bh(&host->lock);
981}
982
983/*
984 * Tasklets
985 */
986
987inline static struct mmc_data* wbsd_get_data(struct wbsd_host* host)
988{
989 WARN_ON(!host->mrq);
990 if (!host->mrq)
991 return NULL;
992
993 WARN_ON(!host->mrq->cmd);
994 if (!host->mrq->cmd)
995 return NULL;
996
997 WARN_ON(!host->mrq->cmd->data);
998 if (!host->mrq->cmd->data)
999 return NULL;
1000
1001 return host->mrq->cmd->data;
1002}
1003
1004static void wbsd_tasklet_card(unsigned long param)
1005{
1006 struct wbsd_host* host = (struct wbsd_host*)param;
1007 u8 csr;
1008
1009 spin_lock(&host->lock);
1010
1011 csr = inb(host->base + WBSD_CSR);
1012 WARN_ON(csr == 0xff);
1013
1014 if (csr & WBSD_CARDPRESENT)
1015 DBG("Card inserted\n");
1016 else
1017 {
1018 DBG("Card removed\n");
1019
1020 if (host->mrq)
1021 {
1022 printk(KERN_ERR DRIVER_NAME
1023 ": Card removed during transfer!\n");
1024 wbsd_reset(host);
1025
1026 host->mrq->cmd->error = MMC_ERR_FAILED;
1027 tasklet_schedule(&host->finish_tasklet);
1028 }
1029 }
1030
1031 /*
1032 * Unlock first since we might get a call back.
1033 */
1034 spin_unlock(&host->lock);
1035
1036 mmc_detect_change(host->mmc);
1037}
1038
1039static void wbsd_tasklet_fifo(unsigned long param)
1040{
1041 struct wbsd_host* host = (struct wbsd_host*)param;
1042 struct mmc_data* data;
1043
1044 spin_lock(&host->lock);
1045
1046 if (!host->mrq)
1047 goto end;
1048
1049 data = wbsd_get_data(host);
1050 if (!data)
1051 goto end;
1052
1053 if (data->flags & MMC_DATA_WRITE)
1054 wbsd_fill_fifo(host);
1055 else
1056 wbsd_empty_fifo(host);
1057
1058 /*
1059 * Done?
1060 */
1061 if (host->size == data->bytes_xfered)
1062 {
1063 wbsd_write_index(host, WBSD_IDX_FIFOEN, 0);
1064 tasklet_schedule(&host->finish_tasklet);
1065 }
1066
1067end:
1068 spin_unlock(&host->lock);
1069}
1070
1071static void wbsd_tasklet_crc(unsigned long param)
1072{
1073 struct wbsd_host* host = (struct wbsd_host*)param;
1074 struct mmc_data* data;
1075
1076 spin_lock(&host->lock);
1077
1078 if (!host->mrq)
1079 goto end;
1080
1081 data = wbsd_get_data(host);
1082 if (!data)
1083 goto end;
1084
1085 DBGF("CRC error\n");
1086
1087 data->error = MMC_ERR_BADCRC;
1088
1089 tasklet_schedule(&host->finish_tasklet);
1090
1091end:
1092 spin_unlock(&host->lock);
1093}
1094
1095static void wbsd_tasklet_timeout(unsigned long param)
1096{
1097 struct wbsd_host* host = (struct wbsd_host*)param;
1098 struct mmc_data* data;
1099
1100 spin_lock(&host->lock);
1101
1102 if (!host->mrq)
1103 goto end;
1104
1105 data = wbsd_get_data(host);
1106 if (!data)
1107 goto end;
1108
1109 DBGF("Timeout\n");
1110
1111 data->error = MMC_ERR_TIMEOUT;
1112
1113 tasklet_schedule(&host->finish_tasklet);
1114
1115end:
1116 spin_unlock(&host->lock);
1117}
1118
1119static void wbsd_tasklet_finish(unsigned long param)
1120{
1121 struct wbsd_host* host = (struct wbsd_host*)param;
1122 struct mmc_data* data;
1123
1124 spin_lock(&host->lock);
1125
1126 WARN_ON(!host->mrq);
1127 if (!host->mrq)
1128 goto end;
1129
1130 data = wbsd_get_data(host);
1131 if (!data)
1132 goto end;
1133
1134 wbsd_finish_data(host, data);
1135
1136end:
1137 spin_unlock(&host->lock);
1138}
1139
1140static void wbsd_tasklet_block(unsigned long param)
1141{
1142 struct wbsd_host* host = (struct wbsd_host*)param;
1143 struct mmc_data* data;
1144
1145 spin_lock(&host->lock);
1146
1147 if ((wbsd_read_index(host, WBSD_IDX_CRCSTATUS) & WBSD_CRC_MASK) !=
1148 WBSD_CRC_OK)
1149 {
1150 data = wbsd_get_data(host);
1151 if (!data)
1152 goto end;
1153
1154 DBGF("CRC error\n");
1155
1156 data->error = MMC_ERR_BADCRC;
1157
1158 tasklet_schedule(&host->finish_tasklet);
1159 }
1160
1161end:
1162 spin_unlock(&host->lock);
1163}
1164
1165/*
1166 * Interrupt handling
1167 */
1168
1169static irqreturn_t wbsd_irq(int irq, void *dev_id, struct pt_regs *regs)
1170{
1171 struct wbsd_host* host = dev_id;
1172 int isr;
1173
1174 isr = inb(host->base + WBSD_ISR);
1175
1176 /*
1177 * Was it actually our hardware that caused the interrupt?
1178 */
1179 if (isr == 0xff || isr == 0x00)
1180 return IRQ_NONE;
1181
1182 host->isr |= isr;
1183
1184 /*
1185 * Schedule tasklets as needed.
1186 */
1187 if (isr & WBSD_INT_CARD)
1188 tasklet_schedule(&host->card_tasklet);
1189 if (isr & WBSD_INT_FIFO_THRE)
1190 tasklet_schedule(&host->fifo_tasklet);
1191 if (isr & WBSD_INT_CRC)
1192 tasklet_hi_schedule(&host->crc_tasklet);
1193 if (isr & WBSD_INT_TIMEOUT)
1194 tasklet_hi_schedule(&host->timeout_tasklet);
1195 if (isr & WBSD_INT_BUSYEND)
1196 tasklet_hi_schedule(&host->block_tasklet);
1197 if (isr & WBSD_INT_TC)
1198 tasklet_schedule(&host->finish_tasklet);
1199
1200 return IRQ_HANDLED;
1201}
1202
1203/*
1204 * Support functions for probe
1205 */
1206
1207static int wbsd_scan(struct wbsd_host* host)
1208{
1209 int i, j, k;
1210 int id;
1211
1212 /*
1213 * Iterate through all ports, all codes to
1214 * find hardware that is in our known list.
1215 */
1216 for (i = 0;i < sizeof(config_ports)/sizeof(int);i++)
1217 {
1218 if (!request_region(config_ports[i], 2, DRIVER_NAME))
1219 continue;
1220
1221 for (j = 0;j < sizeof(unlock_codes)/sizeof(int);j++)
1222 {
1223 id = 0xFFFF;
1224
1225 outb(unlock_codes[j], config_ports[i]);
1226 outb(unlock_codes[j], config_ports[i]);
1227
1228 outb(WBSD_CONF_ID_HI, config_ports[i]);
1229 id = inb(config_ports[i] + 1) << 8;
1230
1231 outb(WBSD_CONF_ID_LO, config_ports[i]);
1232 id |= inb(config_ports[i] + 1);
1233
1234 for (k = 0;k < sizeof(valid_ids)/sizeof(int);k++)
1235 {
1236 if (id == valid_ids[k])
1237 {
1238 host->chip_id = id;
1239 host->config = config_ports[i];
1240 host->unlock_code = unlock_codes[i];
1241
1242 return 0;
1243 }
1244 }
1245
1246 if (id != 0xFFFF)
1247 {
1248 DBG("Unknown hardware (id %x) found at %x\n",
1249 id, config_ports[i]);
1250 }
1251
1252 outb(LOCK_CODE, config_ports[i]);
1253 }
1254
1255 release_region(config_ports[i], 2);
1256 }
1257
1258 return -ENODEV;
1259}
1260
1261static int wbsd_request_regions(struct wbsd_host* host)
1262{
1263 if (io & 0x7)
1264 return -EINVAL;
1265
1266 if (!request_region(io, 8, DRIVER_NAME))
1267 return -EIO;
1268
1269 host->base = io;
1270
1271 return 0;
1272}
1273
1274static void wbsd_release_regions(struct wbsd_host* host)
1275{
1276 if (host->base)
1277 release_region(host->base, 8);
1278
1279 if (host->config)
1280 release_region(host->config, 2);
1281}
1282
1283static void wbsd_init_dma(struct wbsd_host* host)
1284{
1285 host->dma = -1;
1286
1287 if (dma < 0)
1288 return;
1289
1290 if (request_dma(dma, DRIVER_NAME))
1291 goto err;
1292
1293 /*
1294 * We need to allocate a special buffer in
1295 * order for ISA to be able to DMA to it.
1296 */
1297 host->dma_buffer = kmalloc(65536,
1298 GFP_NOIO | GFP_DMA | __GFP_REPEAT | __GFP_NOWARN);
1299 if (!host->dma_buffer)
1300 goto free;
1301
1302 /*
1303 * Translate the address to a physical address.
1304 */
1305 host->dma_addr = isa_virt_to_bus(host->dma_buffer);
1306
1307 /*
1308 * ISA DMA must be aligned on a 64k basis.
1309 */
1310 if ((host->dma_addr & 0xffff) != 0)
1311 goto kfree;
1312 /*
1313 * ISA cannot access memory above 16 MB.
1314 */
1315 else if (host->dma_addr >= 0x1000000)
1316 goto kfree;
1317
1318 host->dma = dma;
1319
1320 return;
1321
1322kfree:
1323 /*
1324 * If we've gotten here then there is some kind of alignment bug
1325 */
1326 BUG_ON(1);
1327
1328 kfree(host->dma_buffer);
1329 host->dma_buffer = NULL;
1330
1331free:
1332 free_dma(dma);
1333
1334err:
1335 printk(KERN_WARNING DRIVER_NAME ": Unable to allocate DMA %d. "
1336 "Falling back on FIFO.\n", dma);
1337}
1338
1339static struct mmc_host_ops wbsd_ops = {
1340 .request = wbsd_request,
1341 .set_ios = wbsd_set_ios,
1342};
1343
1344/*
1345 * Device probe
1346 */
1347
1348static int wbsd_probe(struct device* dev)
1349{
1350 struct wbsd_host* host = NULL;
1351 struct mmc_host* mmc = NULL;
1352 int ret;
1353
1354 /*
1355 * Allocate MMC structure.
1356 */
1357 mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev);
1358 if (!mmc)
1359 return -ENOMEM;
1360
1361 host = mmc_priv(mmc);
1362 host->mmc = mmc;
1363
1364 /*
1365 * Scan for hardware.
1366 */
1367 ret = wbsd_scan(host);
1368 if (ret)
1369 goto freemmc;
1370
1371 /*
1372 * Reset the chip.
1373 */
1374 wbsd_write_config(host, WBSD_CONF_SWRST, 1);
1375 wbsd_write_config(host, WBSD_CONF_SWRST, 0);
1376
1377 /*
1378 * Allocate I/O ports.
1379 */
1380 ret = wbsd_request_regions(host);
1381 if (ret)
1382 goto release;
1383
1384 /*
1385 * Set host parameters.
1386 */
1387 mmc->ops = &wbsd_ops;
1388 mmc->f_min = 375000;
1389 mmc->f_max = 24000000;
1390 mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34;
1391
1392 spin_lock_init(&host->lock);
1393
1394 /*
1395 * Select SD/MMC function.
1396 */
1397 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1398
1399 /*
1400 * Set up card detection.
1401 */
1402 wbsd_write_config(host, WBSD_CONF_PINS, 0x02);
1403
1404 /*
1405 * Configure I/O port.
1406 */
1407 wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8);
1408 wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff);
1409
1410 /*
1411 * Allocate interrupt.
1412 */
1413 ret = request_irq(irq, wbsd_irq, SA_SHIRQ, DRIVER_NAME, host);
1414 if (ret)
1415 goto release;
1416
1417 host->irq = irq;
1418
1419 /*
1420 * Set up tasklets.
1421 */
1422 tasklet_init(&host->card_tasklet, wbsd_tasklet_card, (unsigned long)host);
1423 tasklet_init(&host->fifo_tasklet, wbsd_tasklet_fifo, (unsigned long)host);
1424 tasklet_init(&host->crc_tasklet, wbsd_tasklet_crc, (unsigned long)host);
1425 tasklet_init(&host->timeout_tasklet, wbsd_tasklet_timeout, (unsigned long)host);
1426 tasklet_init(&host->finish_tasklet, wbsd_tasklet_finish, (unsigned long)host);
1427 tasklet_init(&host->block_tasklet, wbsd_tasklet_block, (unsigned long)host);
1428
1429 /*
1430 * Configure interrupt.
1431 */
1432 wbsd_write_config(host, WBSD_CONF_IRQ, host->irq);
1433
1434 /*
1435 * Allocate DMA.
1436 */
1437 wbsd_init_dma(host);
1438
1439 /*
1440 * If all went well, then configure DMA.
1441 */
1442 if (host->dma >= 0)
1443 wbsd_write_config(host, WBSD_CONF_DRQ, host->dma);
1444
1445 /*
1446 * Maximum number of segments. Worst case is one sector per segment
1447 * so this will be 64kB/512.
1448 */
1449 mmc->max_hw_segs = 128;
1450 mmc->max_phys_segs = 128;
1451
1452 /*
1453 * Maximum number of sectors in one transfer. Also limited by 64kB
1454 * buffer.
1455 */
1456 mmc->max_sectors = 128;
1457
1458 /*
1459 * Maximum segment size. Could be one segment with the maximum number
1460 * of segments.
1461 */
1462 mmc->max_seg_size = mmc->max_sectors * 512;
1463
1464 /*
1465 * Enable chip.
1466 */
1467 wbsd_write_config(host, WBSD_CONF_ENABLE, 1);
1468
1469 /*
1470 * Power up chip.
1471 */
1472 wbsd_write_config(host, WBSD_CONF_POWER, 0x20);
1473
1474 /*
1475 * Power Management stuff. No idea how this works.
1476 * Not tested.
1477 */
1478#ifdef CONFIG_PM
1479 wbsd_write_config(host, WBSD_CONF_PME, 0xA0);
1480#endif
1481
1482 /*
1483 * Reset the chip into a known state.
1484 */
1485 wbsd_init_device(host);
1486
1487 dev_set_drvdata(dev, mmc);
1488
1489 /*
1490 * Add host to MMC layer.
1491 */
1492 mmc_add_host(mmc);
1493
1494 printk(KERN_INFO "%s: W83L51xD id %x at 0x%x irq %d dma %d\n",
1495 mmc->host_name, (int)host->chip_id, (int)host->base,
1496 (int)host->irq, (int)host->dma);
1497
1498 return 0;
1499
1500release:
1501 wbsd_release_regions(host);
1502
1503freemmc:
1504 mmc_free_host(mmc);
1505
1506 return ret;
1507}
1508
1509/*
1510 * Device remove
1511 */
1512
1513static int wbsd_remove(struct device* dev)
1514{
1515 struct mmc_host* mmc = dev_get_drvdata(dev);
1516 struct wbsd_host* host;
1517
1518 if (!mmc)
1519 return 0;
1520
1521 host = mmc_priv(mmc);
1522
1523 /*
1524 * Unregister host with MMC layer.
1525 */
1526 mmc_remove_host(mmc);
1527
1528 /*
1529 * Power down the SD/MMC function.
1530 */
1531 wbsd_unlock_config(host);
1532 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1533 wbsd_write_config(host, WBSD_CONF_ENABLE, 0);
1534 wbsd_lock_config(host);
1535
1536 /*
1537 * Free resources.
1538 */
1539 if (host->dma_buffer)
1540 kfree(host->dma_buffer);
1541
1542 if (host->dma >= 0)
1543 free_dma(host->dma);
1544
1545 free_irq(host->irq, host);
1546
1547 tasklet_kill(&host->card_tasklet);
1548 tasklet_kill(&host->fifo_tasklet);
1549 tasklet_kill(&host->crc_tasklet);
1550 tasklet_kill(&host->timeout_tasklet);
1551 tasklet_kill(&host->finish_tasklet);
1552 tasklet_kill(&host->block_tasklet);
1553
1554 wbsd_release_regions(host);
1555
1556 mmc_free_host(mmc);
1557
1558 return 0;
1559}
1560
1561/*
1562 * Power management
1563 */
1564
1565#ifdef CONFIG_PM
1566static int wbsd_suspend(struct device *dev, u32 state, u32 level)
1567{
1568 DBGF("Not yet supported\n");
1569
1570 return 0;
1571}
1572
1573static int wbsd_resume(struct device *dev, u32 level)
1574{
1575 DBGF("Not yet supported\n");
1576
1577 return 0;
1578}
1579#else
1580#define wbsd_suspend NULL
1581#define wbsd_resume NULL
1582#endif
1583
1584static void wbsd_release(struct device *dev)
1585{
1586}
1587
1588static struct platform_device wbsd_device = {
1589 .name = DRIVER_NAME,
1590 .id = -1,
1591 .dev = {
1592 .release = wbsd_release,
1593 },
1594};
1595
1596static struct device_driver wbsd_driver = {
1597 .name = DRIVER_NAME,
1598 .bus = &platform_bus_type,
1599 .probe = wbsd_probe,
1600 .remove = wbsd_remove,
1601
1602 .suspend = wbsd_suspend,
1603 .resume = wbsd_resume,
1604};
1605
1606/*
1607 * Module loading/unloading
1608 */
1609
1610static int __init wbsd_drv_init(void)
1611{
1612 int result;
1613
1614 printk(KERN_INFO DRIVER_NAME
1615 ": Winbond W83L51xD SD/MMC card interface driver, "
1616 DRIVER_VERSION "\n");
1617 printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1618
1619 result = driver_register(&wbsd_driver);
1620 if (result < 0)
1621 return result;
1622
1623 result = platform_device_register(&wbsd_device);
1624 if (result < 0)
1625 return result;
1626
1627 return 0;
1628}
1629
1630static void __exit wbsd_drv_exit(void)
1631{
1632 platform_device_unregister(&wbsd_device);
1633
1634 driver_unregister(&wbsd_driver);
1635
1636 DBG("unloaded\n");
1637}
1638
1639module_init(wbsd_drv_init);
1640module_exit(wbsd_drv_exit);
1641module_param(io, uint, 0444);
1642module_param(irq, uint, 0444);
1643module_param(dma, int, 0444);
1644
1645MODULE_LICENSE("GPL");
1646MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver");
1647MODULE_VERSION(DRIVER_VERSION);
1648
1649MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)");
1650MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)");
1651MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)");
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-18 14:45:38 -0500