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1/*
2 * linux/drivers/mmc/host/wbsd.c - Winbond W83L51xD SD/MMC driver
3 *
4 * Copyright (C) 2004-2007 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 as published by
8 * the Free Software Foundation; either version 2 of the License, or (at
9 * your option) any later version.
10 *
11 *
12 * Warning!
13 *
14 * Changes to the FIFO system should be done with extreme care since
15 * the hardware is full of bugs related to the FIFO. Known issues are:
16 *
17 * - FIFO size field in FSR is always zero.
18 *
19 * - FIFO interrupts tend not to work as they should. Interrupts are
20 * triggered only for full/empty events, not for threshold values.
21 *
22 * - On APIC systems the FIFO empty interrupt is sometimes lost.
23 */
24
25#include <linux/module.h>
26#include <linux/moduleparam.h>
27#include <linux/init.h>
28#include <linux/ioport.h>
29#include <linux/platform_device.h>
30#include <linux/interrupt.h>
31#include <linux/dma-mapping.h>
32#include <linux/delay.h>
33#include <linux/pnp.h>
34#include <linux/highmem.h>
35#include <linux/mmc/host.h>
36#include <linux/scatterlist.h>
37#include <linux/slab.h>
38
39#include <asm/io.h>
40#include <asm/dma.h>
41
42#include "wbsd.h"
43
44#define DRIVER_NAME "wbsd"
45
46#define DBG(x...) \
47 pr_debug(DRIVER_NAME ": " x)
48#define DBGF(f, x...) \
49 pr_debug(DRIVER_NAME " [%s()]: " f, __func__ , ##x)
50
51/*
52 * Device resources
53 */
54
55#ifdef CONFIG_PNP
56
57static const struct pnp_device_id pnp_dev_table[] = {
58 { "WEC0517", 0 },
59 { "WEC0518", 0 },
60 { "", 0 },
61};
62
63MODULE_DEVICE_TABLE(pnp, pnp_dev_table);
64
65#endif /* CONFIG_PNP */
66
67static const int config_ports[] = { 0x2E, 0x4E };
68static const int unlock_codes[] = { 0x83, 0x87 };
69
70static const int valid_ids[] = {
71 0x7112,
72};
73
74#ifdef CONFIG_PNP
75static unsigned int param_nopnp = 0;
76#else
77static const unsigned int param_nopnp = 1;
78#endif
79static unsigned int param_io = 0x248;
80static unsigned int param_irq = 6;
81static int param_dma = 2;
82
83/*
84 * Basic functions
85 */
86
87static inline void wbsd_unlock_config(struct wbsd_host *host)
88{
89 BUG_ON(host->config == 0);
90
91 outb(host->unlock_code, host->config);
92 outb(host->unlock_code, host->config);
93}
94
95static inline void wbsd_lock_config(struct wbsd_host *host)
96{
97 BUG_ON(host->config == 0);
98
99 outb(LOCK_CODE, host->config);
100}
101
102static inline void wbsd_write_config(struct wbsd_host *host, u8 reg, u8 value)
103{
104 BUG_ON(host->config == 0);
105
106 outb(reg, host->config);
107 outb(value, host->config + 1);
108}
109
110static inline u8 wbsd_read_config(struct wbsd_host *host, u8 reg)
111{
112 BUG_ON(host->config == 0);
113
114 outb(reg, host->config);
115 return inb(host->config + 1);
116}
117
118static inline void wbsd_write_index(struct wbsd_host *host, u8 index, u8 value)
119{
120 outb(index, host->base + WBSD_IDXR);
121 outb(value, host->base + WBSD_DATAR);
122}
123
124static inline u8 wbsd_read_index(struct wbsd_host *host, u8 index)
125{
126 outb(index, host->base + WBSD_IDXR);
127 return inb(host->base + WBSD_DATAR);
128}
129
130/*
131 * Common routines
132 */
133
134static void wbsd_init_device(struct wbsd_host *host)
135{
136 u8 setup, ier;
137
138 /*
139 * Reset chip (SD/MMC part) and fifo.
140 */
141 setup = wbsd_read_index(host, WBSD_IDX_SETUP);
142 setup |= WBSD_FIFO_RESET | WBSD_SOFT_RESET;
143 wbsd_write_index(host, WBSD_IDX_SETUP, setup);
144
145 /*
146 * Set DAT3 to input
147 */
148 setup &= ~WBSD_DAT3_H;
149 wbsd_write_index(host, WBSD_IDX_SETUP, setup);
150 host->flags &= ~WBSD_FIGNORE_DETECT;
151
152 /*
153 * Read back default clock.
154 */
155 host->clk = wbsd_read_index(host, WBSD_IDX_CLK);
156
157 /*
158 * Power down port.
159 */
160 outb(WBSD_POWER_N, host->base + WBSD_CSR);
161
162 /*
163 * Set maximum timeout.
164 */
165 wbsd_write_index(host, WBSD_IDX_TAAC, 0x7F);
166
167 /*
168 * Test for card presence
169 */
170 if (inb(host->base + WBSD_CSR) & WBSD_CARDPRESENT)
171 host->flags |= WBSD_FCARD_PRESENT;
172 else
173 host->flags &= ~WBSD_FCARD_PRESENT;
174
175 /*
176 * Enable interesting interrupts.
177 */
178 ier = 0;
179 ier |= WBSD_EINT_CARD;
180 ier |= WBSD_EINT_FIFO_THRE;
181 ier |= WBSD_EINT_CRC;
182 ier |= WBSD_EINT_TIMEOUT;
183 ier |= WBSD_EINT_TC;
184
185 outb(ier, host->base + WBSD_EIR);
186
187 /*
188 * Clear interrupts.
189 */
190 inb(host->base + WBSD_ISR);
191}
192
193static void wbsd_reset(struct wbsd_host *host)
194{
195 u8 setup;
196
197 pr_err("%s: Resetting chip\n", mmc_hostname(host->mmc));
198
199 /*
200 * Soft reset of chip (SD/MMC part).
201 */
202 setup = wbsd_read_index(host, WBSD_IDX_SETUP);
203 setup |= WBSD_SOFT_RESET;
204 wbsd_write_index(host, WBSD_IDX_SETUP, setup);
205}
206
207static void wbsd_request_end(struct wbsd_host *host, struct mmc_request *mrq)
208{
209 unsigned long dmaflags;
210
211 if (host->dma >= 0) {
212 /*
213 * Release ISA DMA controller.
214 */
215 dmaflags = claim_dma_lock();
216 disable_dma(host->dma);
217 clear_dma_ff(host->dma);
218 release_dma_lock(dmaflags);
219
220 /*
221 * Disable DMA on host.
222 */
223 wbsd_write_index(host, WBSD_IDX_DMA, 0);
224 }
225
226 host->mrq = NULL;
227
228 /*
229 * MMC layer might call back into the driver so first unlock.
230 */
231 spin_unlock(&host->lock);
232 mmc_request_done(host->mmc, mrq);
233 spin_lock(&host->lock);
234}
235
236/*
237 * Scatter/gather functions
238 */
239
240static inline void wbsd_init_sg(struct wbsd_host *host, struct mmc_data *data)
241{
242 /*
243 * Get info. about SG list from data structure.
244 */
245 host->cur_sg = data->sg;
246 host->num_sg = data->sg_len;
247
248 host->offset = 0;
249 host->remain = host->cur_sg->length;
250}
251
252static inline int wbsd_next_sg(struct wbsd_host *host)
253{
254 /*
255 * Skip to next SG entry.
256 */
257 host->cur_sg++;
258 host->num_sg--;
259
260 /*
261 * Any entries left?
262 */
263 if (host->num_sg > 0) {
264 host->offset = 0;
265 host->remain = host->cur_sg->length;
266 }
267
268 return host->num_sg;
269}
270
271static inline char *wbsd_sg_to_buffer(struct wbsd_host *host)
272{
273 return sg_virt(host->cur_sg);
274}
275
276static inline void wbsd_sg_to_dma(struct wbsd_host *host, struct mmc_data *data)
277{
278 unsigned int len, i;
279 struct scatterlist *sg;
280 char *dmabuf = host->dma_buffer;
281 char *sgbuf;
282
283 sg = data->sg;
284 len = data->sg_len;
285
286 for (i = 0; i < len; i++) {
287 sgbuf = sg_virt(&sg[i]);
288 memcpy(dmabuf, sgbuf, sg[i].length);
289 dmabuf += sg[i].length;
290 }
291}
292
293static inline void wbsd_dma_to_sg(struct wbsd_host *host, struct mmc_data *data)
294{
295 unsigned int len, i;
296 struct scatterlist *sg;
297 char *dmabuf = host->dma_buffer;
298 char *sgbuf;
299
300 sg = data->sg;
301 len = data->sg_len;
302
303 for (i = 0; i < len; i++) {
304 sgbuf = sg_virt(&sg[i]);
305 memcpy(sgbuf, dmabuf, sg[i].length);
306 dmabuf += sg[i].length;
307 }
308}
309
310/*
311 * Command handling
312 */
313
314static inline void wbsd_get_short_reply(struct wbsd_host *host,
315 struct mmc_command *cmd)
316{
317 /*
318 * Correct response type?
319 */
320 if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_SHORT) {
321 cmd->error = -EILSEQ;
322 return;
323 }
324
325 cmd->resp[0] = wbsd_read_index(host, WBSD_IDX_RESP12) << 24;
326 cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP13) << 16;
327 cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP14) << 8;
328 cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP15) << 0;
329 cmd->resp[1] = wbsd_read_index(host, WBSD_IDX_RESP16) << 24;
330}
331
332static inline void wbsd_get_long_reply(struct wbsd_host *host,
333 struct mmc_command *cmd)
334{
335 int i;
336
337 /*
338 * Correct response type?
339 */
340 if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_LONG) {
341 cmd->error = -EILSEQ;
342 return;
343 }
344
345 for (i = 0; i < 4; i++) {
346 cmd->resp[i] =
347 wbsd_read_index(host, WBSD_IDX_RESP1 + i * 4) << 24;
348 cmd->resp[i] |=
349 wbsd_read_index(host, WBSD_IDX_RESP2 + i * 4) << 16;
350 cmd->resp[i] |=
351 wbsd_read_index(host, WBSD_IDX_RESP3 + i * 4) << 8;
352 cmd->resp[i] |=
353 wbsd_read_index(host, WBSD_IDX_RESP4 + i * 4) << 0;
354 }
355}
356
357static void wbsd_send_command(struct wbsd_host *host, struct mmc_command *cmd)
358{
359 int i;
360 u8 status, isr;
361
362 /*
363 * Clear accumulated ISR. The interrupt routine
364 * will fill this one with events that occur during
365 * transfer.
366 */
367 host->isr = 0;
368
369 /*
370 * Send the command (CRC calculated by host).
371 */
372 outb(cmd->opcode, host->base + WBSD_CMDR);
373 for (i = 3; i >= 0; i--)
374 outb((cmd->arg >> (i * 8)) & 0xff, host->base + WBSD_CMDR);
375
376 cmd->error = 0;
377
378 /*
379 * Wait for the request to complete.
380 */
381 do {
382 status = wbsd_read_index(host, WBSD_IDX_STATUS);
383 } while (status & WBSD_CARDTRAFFIC);
384
385 /*
386 * Do we expect a reply?
387 */
388 if (cmd->flags & MMC_RSP_PRESENT) {
389 /*
390 * Read back status.
391 */
392 isr = host->isr;
393
394 /* Card removed? */
395 if (isr & WBSD_INT_CARD)
396 cmd->error = -ENOMEDIUM;
397 /* Timeout? */
398 else if (isr & WBSD_INT_TIMEOUT)
399 cmd->error = -ETIMEDOUT;
400 /* CRC? */
401 else if ((cmd->flags & MMC_RSP_CRC) && (isr & WBSD_INT_CRC))
402 cmd->error = -EILSEQ;
403 /* All ok */
404 else {
405 if (cmd->flags & MMC_RSP_136)
406 wbsd_get_long_reply(host, cmd);
407 else
408 wbsd_get_short_reply(host, cmd);
409 }
410 }
411}
412
413/*
414 * Data functions
415 */
416
417static void wbsd_empty_fifo(struct wbsd_host *host)
418{
419 struct mmc_data *data = host->mrq->cmd->data;
420 char *buffer;
421 int i, fsr, fifo;
422
423 /*
424 * Handle excessive data.
425 */
426 if (host->num_sg == 0)
427 return;
428
429 buffer = wbsd_sg_to_buffer(host) + host->offset;
430
431 /*
432 * Drain the fifo. This has a tendency to loop longer
433 * than the FIFO length (usually one block).
434 */
435 while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_EMPTY)) {
436 /*
437 * The size field in the FSR is broken so we have to
438 * do some guessing.
439 */
440 if (fsr & WBSD_FIFO_FULL)
441 fifo = 16;
442 else if (fsr & WBSD_FIFO_FUTHRE)
443 fifo = 8;
444 else
445 fifo = 1;
446
447 for (i = 0; i < fifo; i++) {
448 *buffer = inb(host->base + WBSD_DFR);
449 buffer++;
450 host->offset++;
451 host->remain--;
452
453 data->bytes_xfered++;
454
455 /*
456 * End of scatter list entry?
457 */
458 if (host->remain == 0) {
459 /*
460 * Get next entry. Check if last.
461 */
462 if (!wbsd_next_sg(host))
463 return;
464
465 buffer = wbsd_sg_to_buffer(host);
466 }
467 }
468 }
469
470 /*
471 * This is a very dirty hack to solve a
472 * hardware problem. The chip doesn't trigger
473 * FIFO threshold interrupts properly.
474 */
475 if ((data->blocks * data->blksz - data->bytes_xfered) < 16)
476 tasklet_schedule(&host->fifo_tasklet);
477}
478
479static void wbsd_fill_fifo(struct wbsd_host *host)
480{
481 struct mmc_data *data = host->mrq->cmd->data;
482 char *buffer;
483 int i, fsr, fifo;
484
485 /*
486 * Check that we aren't being called after the
487 * entire buffer has been transferred.
488 */
489 if (host->num_sg == 0)
490 return;
491
492 buffer = wbsd_sg_to_buffer(host) + host->offset;
493
494 /*
495 * Fill the fifo. This has a tendency to loop longer
496 * than the FIFO length (usually one block).
497 */
498 while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_FULL)) {
499 /*
500 * The size field in the FSR is broken so we have to
501 * do some guessing.
502 */
503 if (fsr & WBSD_FIFO_EMPTY)
504 fifo = 0;
505 else if (fsr & WBSD_FIFO_EMTHRE)
506 fifo = 8;
507 else
508 fifo = 15;
509
510 for (i = 16; i > fifo; i--) {
511 outb(*buffer, host->base + WBSD_DFR);
512 buffer++;
513 host->offset++;
514 host->remain--;
515
516 data->bytes_xfered++;
517
518 /*
519 * End of scatter list entry?
520 */
521 if (host->remain == 0) {
522 /*
523 * Get next entry. Check if last.
524 */
525 if (!wbsd_next_sg(host))
526 return;
527
528 buffer = wbsd_sg_to_buffer(host);
529 }
530 }
531 }
532
533 /*
534 * The controller stops sending interrupts for
535 * 'FIFO empty' under certain conditions. So we
536 * need to be a bit more pro-active.
537 */
538 tasklet_schedule(&host->fifo_tasklet);
539}
540
541static void wbsd_prepare_data(struct wbsd_host *host, struct mmc_data *data)
542{
543 u16 blksize;
544 u8 setup;
545 unsigned long dmaflags;
546 unsigned int size;
547
548 /*
549 * Calculate size.
550 */
551 size = data->blocks * data->blksz;
552
553 /*
554 * Check timeout values for overflow.
555 * (Yes, some cards cause this value to overflow).
556 */
557 if (data->timeout_ns > 127000000)
558 wbsd_write_index(host, WBSD_IDX_TAAC, 127);
559 else {
560 wbsd_write_index(host, WBSD_IDX_TAAC,
561 data->timeout_ns / 1000000);
562 }
563
564 if (data->timeout_clks > 255)
565 wbsd_write_index(host, WBSD_IDX_NSAC, 255);
566 else
567 wbsd_write_index(host, WBSD_IDX_NSAC, data->timeout_clks);
568
569 /*
570 * Inform the chip of how large blocks will be
571 * sent. It needs this to determine when to
572 * calculate CRC.
573 *
574 * Space for CRC must be included in the size.
575 * Two bytes are needed for each data line.
576 */
577 if (host->bus_width == MMC_BUS_WIDTH_1) {
578 blksize = data->blksz + 2;
579
580 wbsd_write_index(host, WBSD_IDX_PBSMSB, (blksize >> 4) & 0xF0);
581 wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
582 } else if (host->bus_width == MMC_BUS_WIDTH_4) {
583 blksize = data->blksz + 2 * 4;
584
585 wbsd_write_index(host, WBSD_IDX_PBSMSB,
586 ((blksize >> 4) & 0xF0) | WBSD_DATA_WIDTH);
587 wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
588 } else {
589 data->error = -EINVAL;
590 return;
591 }
592
593 /*
594 * Clear the FIFO. This is needed even for DMA
595 * transfers since the chip still uses the FIFO
596 * internally.
597 */
598 setup = wbsd_read_index(host, WBSD_IDX_SETUP);
599 setup |= WBSD_FIFO_RESET;
600 wbsd_write_index(host, WBSD_IDX_SETUP, setup);
601
602 /*
603 * DMA transfer?
604 */
605 if (host->dma >= 0) {
606 /*
607 * The buffer for DMA is only 64 kB.
608 */
609 BUG_ON(size > 0x10000);
610 if (size > 0x10000) {
611 data->error = -EINVAL;
612 return;
613 }
614
615 /*
616 * Transfer data from the SG list to
617 * the DMA buffer.
618 */
619 if (data->flags & MMC_DATA_WRITE)
620 wbsd_sg_to_dma(host, data);
621
622 /*
623 * Initialise the ISA DMA controller.
624 */
625 dmaflags = claim_dma_lock();
626 disable_dma(host->dma);
627 clear_dma_ff(host->dma);
628 if (data->flags & MMC_DATA_READ)
629 set_dma_mode(host->dma, DMA_MODE_READ & ~0x40);
630 else
631 set_dma_mode(host->dma, DMA_MODE_WRITE & ~0x40);
632 set_dma_addr(host->dma, host->dma_addr);
633 set_dma_count(host->dma, size);
634
635 enable_dma(host->dma);
636 release_dma_lock(dmaflags);
637
638 /*
639 * Enable DMA on the host.
640 */
641 wbsd_write_index(host, WBSD_IDX_DMA, WBSD_DMA_ENABLE);
642 } else {
643 /*
644 * This flag is used to keep printk
645 * output to a minimum.
646 */
647 host->firsterr = 1;
648
649 /*
650 * Initialise the SG list.
651 */
652 wbsd_init_sg(host, data);
653
654 /*
655 * Turn off DMA.
656 */
657 wbsd_write_index(host, WBSD_IDX_DMA, 0);
658
659 /*
660 * Set up FIFO threshold levels (and fill
661 * buffer if doing a write).
662 */
663 if (data->flags & MMC_DATA_READ) {
664 wbsd_write_index(host, WBSD_IDX_FIFOEN,
665 WBSD_FIFOEN_FULL | 8);
666 } else {
667 wbsd_write_index(host, WBSD_IDX_FIFOEN,
668 WBSD_FIFOEN_EMPTY | 8);
669 wbsd_fill_fifo(host);
670 }
671 }
672
673 data->error = 0;
674}
675
676static void wbsd_finish_data(struct wbsd_host *host, struct mmc_data *data)
677{
678 unsigned long dmaflags;
679 int count;
680 u8 status;
681
682 WARN_ON(host->mrq == NULL);
683
684 /*
685 * Send a stop command if needed.
686 */
687 if (data->stop)
688 wbsd_send_command(host, data->stop);
689
690 /*
691 * Wait for the controller to leave data
692 * transfer state.
693 */
694 do {
695 status = wbsd_read_index(host, WBSD_IDX_STATUS);
696 } while (status & (WBSD_BLOCK_READ | WBSD_BLOCK_WRITE));
697
698 /*
699 * DMA transfer?
700 */
701 if (host->dma >= 0) {
702 /*
703 * Disable DMA on the host.
704 */
705 wbsd_write_index(host, WBSD_IDX_DMA, 0);
706
707 /*
708 * Turn of ISA DMA controller.
709 */
710 dmaflags = claim_dma_lock();
711 disable_dma(host->dma);
712 clear_dma_ff(host->dma);
713 count = get_dma_residue(host->dma);
714 release_dma_lock(dmaflags);
715
716 data->bytes_xfered = host->mrq->data->blocks *
717 host->mrq->data->blksz - count;
718 data->bytes_xfered -= data->bytes_xfered % data->blksz;
719
720 /*
721 * Any leftover data?
722 */
723 if (count) {
724 pr_err("%s: Incomplete DMA transfer. "
725 "%d bytes left.\n",
726 mmc_hostname(host->mmc), count);
727
728 if (!data->error)
729 data->error = -EIO;
730 } else {
731 /*
732 * Transfer data from DMA buffer to
733 * SG list.
734 */
735 if (data->flags & MMC_DATA_READ)
736 wbsd_dma_to_sg(host, data);
737 }
738
739 if (data->error) {
740 if (data->bytes_xfered)
741 data->bytes_xfered -= data->blksz;
742 }
743 }
744
745 wbsd_request_end(host, host->mrq);
746}
747
748/*****************************************************************************\
749 * *
750 * MMC layer callbacks *
751 * *
752\*****************************************************************************/
753
754static void wbsd_request(struct mmc_host *mmc, struct mmc_request *mrq)
755{
756 struct wbsd_host *host = mmc_priv(mmc);
757 struct mmc_command *cmd;
758
759 /*
760 * Disable tasklets to avoid a deadlock.
761 */
762 spin_lock_bh(&host->lock);
763
764 BUG_ON(host->mrq != NULL);
765
766 cmd = mrq->cmd;
767
768 host->mrq = mrq;
769
770 /*
771 * Check that there is actually a card in the slot.
772 */
773 if (!(host->flags & WBSD_FCARD_PRESENT)) {
774 cmd->error = -ENOMEDIUM;
775 goto done;
776 }
777
778 if (cmd->data) {
779 /*
780 * The hardware is so delightfully stupid that it has a list
781 * of "data" commands. If a command isn't on this list, it'll
782 * just go back to the idle state and won't send any data
783 * interrupts.
784 */
785 switch (cmd->opcode) {
786 case 11:
787 case 17:
788 case 18:
789 case 20:
790 case 24:
791 case 25:
792 case 26:
793 case 27:
794 case 30:
795 case 42:
796 case 56:
797 break;
798
799 /* ACMDs. We don't keep track of state, so we just treat them
800 * like any other command. */
801 case 51:
802 break;
803
804 default:
805 pr_warn("%s: Data command %d is not supported by this controller\n",
806 mmc_hostname(host->mmc), cmd->opcode);
807 cmd->error = -EINVAL;
808
809 goto done;
810 }
811 }
812
813 /*
814 * Does the request include data?
815 */
816 if (cmd->data) {
817 wbsd_prepare_data(host, cmd->data);
818
819 if (cmd->data->error)
820 goto done;
821 }
822
823 wbsd_send_command(host, cmd);
824
825 /*
826 * If this is a data transfer the request
827 * will be finished after the data has
828 * transferred.
829 */
830 if (cmd->data && !cmd->error) {
831 /*
832 * Dirty fix for hardware bug.
833 */
834 if (host->dma == -1)
835 tasklet_schedule(&host->fifo_tasklet);
836
837 spin_unlock_bh(&host->lock);
838
839 return;
840 }
841
842done:
843 wbsd_request_end(host, mrq);
844
845 spin_unlock_bh(&host->lock);
846}
847
848static void wbsd_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
849{
850 struct wbsd_host *host = mmc_priv(mmc);
851 u8 clk, setup, pwr;
852
853 spin_lock_bh(&host->lock);
854
855 /*
856 * Reset the chip on each power off.
857 * Should clear out any weird states.
858 */
859 if (ios->power_mode == MMC_POWER_OFF)
860 wbsd_init_device(host);
861
862 if (ios->clock >= 24000000)
863 clk = WBSD_CLK_24M;
864 else if (ios->clock >= 16000000)
865 clk = WBSD_CLK_16M;
866 else if (ios->clock >= 12000000)
867 clk = WBSD_CLK_12M;
868 else
869 clk = WBSD_CLK_375K;
870
871 /*
872 * Only write to the clock register when
873 * there is an actual change.
874 */
875 if (clk != host->clk) {
876 wbsd_write_index(host, WBSD_IDX_CLK, clk);
877 host->clk = clk;
878 }
879
880 /*
881 * Power up card.
882 */
883 if (ios->power_mode != MMC_POWER_OFF) {
884 pwr = inb(host->base + WBSD_CSR);
885 pwr &= ~WBSD_POWER_N;
886 outb(pwr, host->base + WBSD_CSR);
887 }
888
889 /*
890 * MMC cards need to have pin 1 high during init.
891 * It wreaks havoc with the card detection though so
892 * that needs to be disabled.
893 */
894 setup = wbsd_read_index(host, WBSD_IDX_SETUP);
895 if (ios->chip_select == MMC_CS_HIGH) {
896 BUG_ON(ios->bus_width != MMC_BUS_WIDTH_1);
897 setup |= WBSD_DAT3_H;
898 host->flags |= WBSD_FIGNORE_DETECT;
899 } else {
900 if (setup & WBSD_DAT3_H) {
901 setup &= ~WBSD_DAT3_H;
902
903 /*
904 * We cannot resume card detection immediately
905 * because of capacitance and delays in the chip.
906 */
907 mod_timer(&host->ignore_timer, jiffies + HZ / 100);
908 }
909 }
910 wbsd_write_index(host, WBSD_IDX_SETUP, setup);
911
912 /*
913 * Store bus width for later. Will be used when
914 * setting up the data transfer.
915 */
916 host->bus_width = ios->bus_width;
917
918 spin_unlock_bh(&host->lock);
919}
920
921static int wbsd_get_ro(struct mmc_host *mmc)
922{
923 struct wbsd_host *host = mmc_priv(mmc);
924 u8 csr;
925
926 spin_lock_bh(&host->lock);
927
928 csr = inb(host->base + WBSD_CSR);
929 csr |= WBSD_MSLED;
930 outb(csr, host->base + WBSD_CSR);
931
932 mdelay(1);
933
934 csr = inb(host->base + WBSD_CSR);
935 csr &= ~WBSD_MSLED;
936 outb(csr, host->base + WBSD_CSR);
937
938 spin_unlock_bh(&host->lock);
939
940 return !!(csr & WBSD_WRPT);
941}
942
943static const struct mmc_host_ops wbsd_ops = {
944 .request = wbsd_request,
945 .set_ios = wbsd_set_ios,
946 .get_ro = wbsd_get_ro,
947};
948
949/*****************************************************************************\
950 * *
951 * Interrupt handling *
952 * *
953\*****************************************************************************/
954
955/*
956 * Helper function to reset detection ignore
957 */
958
959static void wbsd_reset_ignore(struct timer_list *t)
960{
961 struct wbsd_host *host = from_timer(host, t, ignore_timer);
962
963 BUG_ON(host == NULL);
964
965 DBG("Resetting card detection ignore\n");
966
967 spin_lock_bh(&host->lock);
968
969 host->flags &= ~WBSD_FIGNORE_DETECT;
970
971 /*
972 * Card status might have changed during the
973 * blackout.
974 */
975 tasklet_schedule(&host->card_tasklet);
976
977 spin_unlock_bh(&host->lock);
978}
979
980/*
981 * Tasklets
982 */
983
984static inline struct mmc_data *wbsd_get_data(struct wbsd_host *host)
985{
986 WARN_ON(!host->mrq);
987 if (!host->mrq)
988 return NULL;
989
990 WARN_ON(!host->mrq->cmd);
991 if (!host->mrq->cmd)
992 return NULL;
993
994 WARN_ON(!host->mrq->cmd->data);
995 if (!host->mrq->cmd->data)
996 return NULL;
997
998 return host->mrq->cmd->data;
999}
1000
1001static void wbsd_tasklet_card(unsigned long param)
1002{
1003 struct wbsd_host *host = (struct wbsd_host *)param;
1004 u8 csr;
1005 int delay = -1;
1006
1007 spin_lock(&host->lock);
1008
1009 if (host->flags & WBSD_FIGNORE_DETECT) {
1010 spin_unlock(&host->lock);
1011 return;
1012 }
1013
1014 csr = inb(host->base + WBSD_CSR);
1015 WARN_ON(csr == 0xff);
1016
1017 if (csr & WBSD_CARDPRESENT) {
1018 if (!(host->flags & WBSD_FCARD_PRESENT)) {
1019 DBG("Card inserted\n");
1020 host->flags |= WBSD_FCARD_PRESENT;
1021
1022 delay = 500;
1023 }
1024 } else if (host->flags & WBSD_FCARD_PRESENT) {
1025 DBG("Card removed\n");
1026 host->flags &= ~WBSD_FCARD_PRESENT;
1027
1028 if (host->mrq) {
1029 pr_err("%s: Card removed during transfer!\n",
1030 mmc_hostname(host->mmc));
1031 wbsd_reset(host);
1032
1033 host->mrq->cmd->error = -ENOMEDIUM;
1034 tasklet_schedule(&host->finish_tasklet);
1035 }
1036
1037 delay = 0;
1038 }
1039
1040 /*
1041 * Unlock first since we might get a call back.
1042 */
1043
1044 spin_unlock(&host->lock);
1045
1046 if (delay != -1)
1047 mmc_detect_change(host->mmc, msecs_to_jiffies(delay));
1048}
1049
1050static void wbsd_tasklet_fifo(unsigned long param)
1051{
1052 struct wbsd_host *host = (struct wbsd_host *)param;
1053 struct mmc_data *data;
1054
1055 spin_lock(&host->lock);
1056
1057 if (!host->mrq)
1058 goto end;
1059
1060 data = wbsd_get_data(host);
1061 if (!data)
1062 goto end;
1063
1064 if (data->flags & MMC_DATA_WRITE)
1065 wbsd_fill_fifo(host);
1066 else
1067 wbsd_empty_fifo(host);
1068
1069 /*
1070 * Done?
1071 */
1072 if (host->num_sg == 0) {
1073 wbsd_write_index(host, WBSD_IDX_FIFOEN, 0);
1074 tasklet_schedule(&host->finish_tasklet);
1075 }
1076
1077end:
1078 spin_unlock(&host->lock);
1079}
1080
1081static void wbsd_tasklet_crc(unsigned long param)
1082{
1083 struct wbsd_host *host = (struct wbsd_host *)param;
1084 struct mmc_data *data;
1085
1086 spin_lock(&host->lock);
1087
1088 if (!host->mrq)
1089 goto end;
1090
1091 data = wbsd_get_data(host);
1092 if (!data)
1093 goto end;
1094
1095 DBGF("CRC error\n");
1096
1097 data->error = -EILSEQ;
1098
1099 tasklet_schedule(&host->finish_tasklet);
1100
1101end:
1102 spin_unlock(&host->lock);
1103}
1104
1105static void wbsd_tasklet_timeout(unsigned long param)
1106{
1107 struct wbsd_host *host = (struct wbsd_host *)param;
1108 struct mmc_data *data;
1109
1110 spin_lock(&host->lock);
1111
1112 if (!host->mrq)
1113 goto end;
1114
1115 data = wbsd_get_data(host);
1116 if (!data)
1117 goto end;
1118
1119 DBGF("Timeout\n");
1120
1121 data->error = -ETIMEDOUT;
1122
1123 tasklet_schedule(&host->finish_tasklet);
1124
1125end:
1126 spin_unlock(&host->lock);
1127}
1128
1129static void wbsd_tasklet_finish(unsigned long param)
1130{
1131 struct wbsd_host *host = (struct wbsd_host *)param;
1132 struct mmc_data *data;
1133
1134 spin_lock(&host->lock);
1135
1136 WARN_ON(!host->mrq);
1137 if (!host->mrq)
1138 goto end;
1139
1140 data = wbsd_get_data(host);
1141 if (!data)
1142 goto end;
1143
1144 wbsd_finish_data(host, data);
1145
1146end:
1147 spin_unlock(&host->lock);
1148}
1149
1150/*
1151 * Interrupt handling
1152 */
1153
1154static irqreturn_t wbsd_irq(int irq, void *dev_id)
1155{
1156 struct wbsd_host *host = dev_id;
1157 int isr;
1158
1159 isr = inb(host->base + WBSD_ISR);
1160
1161 /*
1162 * Was it actually our hardware that caused the interrupt?
1163 */
1164 if (isr == 0xff || isr == 0x00)
1165 return IRQ_NONE;
1166
1167 host->isr |= isr;
1168
1169 /*
1170 * Schedule tasklets as needed.
1171 */
1172 if (isr & WBSD_INT_CARD)
1173 tasklet_schedule(&host->card_tasklet);
1174 if (isr & WBSD_INT_FIFO_THRE)
1175 tasklet_schedule(&host->fifo_tasklet);
1176 if (isr & WBSD_INT_CRC)
1177 tasklet_hi_schedule(&host->crc_tasklet);
1178 if (isr & WBSD_INT_TIMEOUT)
1179 tasklet_hi_schedule(&host->timeout_tasklet);
1180 if (isr & WBSD_INT_TC)
1181 tasklet_schedule(&host->finish_tasklet);
1182
1183 return IRQ_HANDLED;
1184}
1185
1186/*****************************************************************************\
1187 * *
1188 * Device initialisation and shutdown *
1189 * *
1190\*****************************************************************************/
1191
1192/*
1193 * Allocate/free MMC structure.
1194 */
1195
1196static int wbsd_alloc_mmc(struct device *dev)
1197{
1198 struct mmc_host *mmc;
1199 struct wbsd_host *host;
1200
1201 /*
1202 * Allocate MMC structure.
1203 */
1204 mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev);
1205 if (!mmc)
1206 return -ENOMEM;
1207
1208 host = mmc_priv(mmc);
1209 host->mmc = mmc;
1210
1211 host->dma = -1;
1212
1213 /*
1214 * Set host parameters.
1215 */
1216 mmc->ops = &wbsd_ops;
1217 mmc->f_min = 375000;
1218 mmc->f_max = 24000000;
1219 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1220 mmc->caps = MMC_CAP_4_BIT_DATA;
1221
1222 spin_lock_init(&host->lock);
1223
1224 /*
1225 * Set up timers
1226 */
1227 timer_setup(&host->ignore_timer, wbsd_reset_ignore, 0);
1228
1229 /*
1230 * Maximum number of segments. Worst case is one sector per segment
1231 * so this will be 64kB/512.
1232 */
1233 mmc->max_segs = 128;
1234
1235 /*
1236 * Maximum request size. Also limited by 64KiB buffer.
1237 */
1238 mmc->max_req_size = 65536;
1239
1240 /*
1241 * Maximum segment size. Could be one segment with the maximum number
1242 * of bytes.
1243 */
1244 mmc->max_seg_size = mmc->max_req_size;
1245
1246 /*
1247 * Maximum block size. We have 12 bits (= 4095) but have to subtract
1248 * space for CRC. So the maximum is 4095 - 4*2 = 4087.
1249 */
1250 mmc->max_blk_size = 4087;
1251
1252 /*
1253 * Maximum block count. There is no real limit so the maximum
1254 * request size will be the only restriction.
1255 */
1256 mmc->max_blk_count = mmc->max_req_size;
1257
1258 dev_set_drvdata(dev, mmc);
1259
1260 return 0;
1261}
1262
1263static void wbsd_free_mmc(struct device *dev)
1264{
1265 struct mmc_host *mmc;
1266 struct wbsd_host *host;
1267
1268 mmc = dev_get_drvdata(dev);
1269 if (!mmc)
1270 return;
1271
1272 host = mmc_priv(mmc);
1273 BUG_ON(host == NULL);
1274
1275 del_timer_sync(&host->ignore_timer);
1276
1277 mmc_free_host(mmc);
1278
1279 dev_set_drvdata(dev, NULL);
1280}
1281
1282/*
1283 * Scan for known chip id:s
1284 */
1285
1286static int wbsd_scan(struct wbsd_host *host)
1287{
1288 int i, j, k;
1289 int id;
1290
1291 /*
1292 * Iterate through all ports, all codes to
1293 * find hardware that is in our known list.
1294 */
1295 for (i = 0; i < ARRAY_SIZE(config_ports); i++) {
1296 if (!request_region(config_ports[i], 2, DRIVER_NAME))
1297 continue;
1298
1299 for (j = 0; j < ARRAY_SIZE(unlock_codes); j++) {
1300 id = 0xFFFF;
1301
1302 host->config = config_ports[i];
1303 host->unlock_code = unlock_codes[j];
1304
1305 wbsd_unlock_config(host);
1306
1307 outb(WBSD_CONF_ID_HI, config_ports[i]);
1308 id = inb(config_ports[i] + 1) << 8;
1309
1310 outb(WBSD_CONF_ID_LO, config_ports[i]);
1311 id |= inb(config_ports[i] + 1);
1312
1313 wbsd_lock_config(host);
1314
1315 for (k = 0; k < ARRAY_SIZE(valid_ids); k++) {
1316 if (id == valid_ids[k]) {
1317 host->chip_id = id;
1318
1319 return 0;
1320 }
1321 }
1322
1323 if (id != 0xFFFF) {
1324 DBG("Unknown hardware (id %x) found at %x\n",
1325 id, config_ports[i]);
1326 }
1327 }
1328
1329 release_region(config_ports[i], 2);
1330 }
1331
1332 host->config = 0;
1333 host->unlock_code = 0;
1334
1335 return -ENODEV;
1336}
1337
1338/*
1339 * Allocate/free io port ranges
1340 */
1341
1342static int wbsd_request_region(struct wbsd_host *host, int base)
1343{
1344 if (base & 0x7)
1345 return -EINVAL;
1346
1347 if (!request_region(base, 8, DRIVER_NAME))
1348 return -EIO;
1349
1350 host->base = base;
1351
1352 return 0;
1353}
1354
1355static void wbsd_release_regions(struct wbsd_host *host)
1356{
1357 if (host->base)
1358 release_region(host->base, 8);
1359
1360 host->base = 0;
1361
1362 if (host->config)
1363 release_region(host->config, 2);
1364
1365 host->config = 0;
1366}
1367
1368/*
1369 * Allocate/free DMA port and buffer
1370 */
1371
1372static void wbsd_request_dma(struct wbsd_host *host, int dma)
1373{
1374 if (dma < 0)
1375 return;
1376
1377 if (request_dma(dma, DRIVER_NAME))
1378 goto err;
1379
1380 /*
1381 * We need to allocate a special buffer in
1382 * order for ISA to be able to DMA to it.
1383 */
1384 host->dma_buffer = kmalloc(WBSD_DMA_SIZE,
1385 GFP_NOIO | GFP_DMA | __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
1386 if (!host->dma_buffer)
1387 goto free;
1388
1389 /*
1390 * Translate the address to a physical address.
1391 */
1392 host->dma_addr = dma_map_single(mmc_dev(host->mmc), host->dma_buffer,
1393 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1394 if (dma_mapping_error(mmc_dev(host->mmc), host->dma_addr))
1395 goto kfree;
1396
1397 /*
1398 * ISA DMA must be aligned on a 64k basis.
1399 */
1400 if ((host->dma_addr & 0xffff) != 0)
1401 goto unmap;
1402 /*
1403 * ISA cannot access memory above 16 MB.
1404 */
1405 else if (host->dma_addr >= 0x1000000)
1406 goto unmap;
1407
1408 host->dma = dma;
1409
1410 return;
1411
1412unmap:
1413 /*
1414 * If we've gotten here then there is some kind of alignment bug
1415 */
1416 BUG_ON(1);
1417
1418 dma_unmap_single(mmc_dev(host->mmc), host->dma_addr,
1419 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1420 host->dma_addr = 0;
1421
1422kfree:
1423 kfree(host->dma_buffer);
1424 host->dma_buffer = NULL;
1425
1426free:
1427 free_dma(dma);
1428
1429err:
1430 pr_warn(DRIVER_NAME ": Unable to allocate DMA %d - falling back on FIFO\n",
1431 dma);
1432}
1433
1434static void wbsd_release_dma(struct wbsd_host *host)
1435{
1436 /*
1437 * host->dma_addr is valid here iff host->dma_buffer is not NULL.
1438 */
1439 if (host->dma_buffer) {
1440 dma_unmap_single(mmc_dev(host->mmc), host->dma_addr,
1441 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1442 kfree(host->dma_buffer);
1443 }
1444 if (host->dma >= 0)
1445 free_dma(host->dma);
1446
1447 host->dma = -1;
1448 host->dma_buffer = NULL;
1449 host->dma_addr = 0;
1450}
1451
1452/*
1453 * Allocate/free IRQ.
1454 */
1455
1456static int wbsd_request_irq(struct wbsd_host *host, int irq)
1457{
1458 int ret;
1459
1460 /*
1461 * Set up tasklets. Must be done before requesting interrupt.
1462 */
1463 tasklet_init(&host->card_tasklet, wbsd_tasklet_card,
1464 (unsigned long)host);
1465 tasklet_init(&host->fifo_tasklet, wbsd_tasklet_fifo,
1466 (unsigned long)host);
1467 tasklet_init(&host->crc_tasklet, wbsd_tasklet_crc,
1468 (unsigned long)host);
1469 tasklet_init(&host->timeout_tasklet, wbsd_tasklet_timeout,
1470 (unsigned long)host);
1471 tasklet_init(&host->finish_tasklet, wbsd_tasklet_finish,
1472 (unsigned long)host);
1473
1474 /*
1475 * Allocate interrupt.
1476 */
1477 ret = request_irq(irq, wbsd_irq, IRQF_SHARED, DRIVER_NAME, host);
1478 if (ret)
1479 return ret;
1480
1481 host->irq = irq;
1482
1483 return 0;
1484}
1485
1486static void wbsd_release_irq(struct wbsd_host *host)
1487{
1488 if (!host->irq)
1489 return;
1490
1491 free_irq(host->irq, host);
1492
1493 host->irq = 0;
1494
1495 tasklet_kill(&host->card_tasklet);
1496 tasklet_kill(&host->fifo_tasklet);
1497 tasklet_kill(&host->crc_tasklet);
1498 tasklet_kill(&host->timeout_tasklet);
1499 tasklet_kill(&host->finish_tasklet);
1500}
1501
1502/*
1503 * Allocate all resources for the host.
1504 */
1505
1506static int wbsd_request_resources(struct wbsd_host *host,
1507 int base, int irq, int dma)
1508{
1509 int ret;
1510
1511 /*
1512 * Allocate I/O ports.
1513 */
1514 ret = wbsd_request_region(host, base);
1515 if (ret)
1516 return ret;
1517
1518 /*
1519 * Allocate interrupt.
1520 */
1521 ret = wbsd_request_irq(host, irq);
1522 if (ret)
1523 return ret;
1524
1525 /*
1526 * Allocate DMA.
1527 */
1528 wbsd_request_dma(host, dma);
1529
1530 return 0;
1531}
1532
1533/*
1534 * Release all resources for the host.
1535 */
1536
1537static void wbsd_release_resources(struct wbsd_host *host)
1538{
1539 wbsd_release_dma(host);
1540 wbsd_release_irq(host);
1541 wbsd_release_regions(host);
1542}
1543
1544/*
1545 * Configure the resources the chip should use.
1546 */
1547
1548static void wbsd_chip_config(struct wbsd_host *host)
1549{
1550 wbsd_unlock_config(host);
1551
1552 /*
1553 * Reset the chip.
1554 */
1555 wbsd_write_config(host, WBSD_CONF_SWRST, 1);
1556 wbsd_write_config(host, WBSD_CONF_SWRST, 0);
1557
1558 /*
1559 * Select SD/MMC function.
1560 */
1561 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1562
1563 /*
1564 * Set up card detection.
1565 */
1566 wbsd_write_config(host, WBSD_CONF_PINS, WBSD_PINS_DETECT_GP11);
1567
1568 /*
1569 * Configure chip
1570 */
1571 wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8);
1572 wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff);
1573
1574 wbsd_write_config(host, WBSD_CONF_IRQ, host->irq);
1575
1576 if (host->dma >= 0)
1577 wbsd_write_config(host, WBSD_CONF_DRQ, host->dma);
1578
1579 /*
1580 * Enable and power up chip.
1581 */
1582 wbsd_write_config(host, WBSD_CONF_ENABLE, 1);
1583 wbsd_write_config(host, WBSD_CONF_POWER, 0x20);
1584
1585 wbsd_lock_config(host);
1586}
1587
1588/*
1589 * Check that configured resources are correct.
1590 */
1591
1592static int wbsd_chip_validate(struct wbsd_host *host)
1593{
1594 int base, irq, dma;
1595
1596 wbsd_unlock_config(host);
1597
1598 /*
1599 * Select SD/MMC function.
1600 */
1601 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1602
1603 /*
1604 * Read configuration.
1605 */
1606 base = wbsd_read_config(host, WBSD_CONF_PORT_HI) << 8;
1607 base |= wbsd_read_config(host, WBSD_CONF_PORT_LO);
1608
1609 irq = wbsd_read_config(host, WBSD_CONF_IRQ);
1610
1611 dma = wbsd_read_config(host, WBSD_CONF_DRQ);
1612
1613 wbsd_lock_config(host);
1614
1615 /*
1616 * Validate against given configuration.
1617 */
1618 if (base != host->base)
1619 return 0;
1620 if (irq != host->irq)
1621 return 0;
1622 if ((dma != host->dma) && (host->dma != -1))
1623 return 0;
1624
1625 return 1;
1626}
1627
1628/*
1629 * Powers down the SD function
1630 */
1631
1632static void wbsd_chip_poweroff(struct wbsd_host *host)
1633{
1634 wbsd_unlock_config(host);
1635
1636 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1637 wbsd_write_config(host, WBSD_CONF_ENABLE, 0);
1638
1639 wbsd_lock_config(host);
1640}
1641
1642/*****************************************************************************\
1643 * *
1644 * Devices setup and shutdown *
1645 * *
1646\*****************************************************************************/
1647
1648static int wbsd_init(struct device *dev, int base, int irq, int dma,
1649 int pnp)
1650{
1651 struct wbsd_host *host = NULL;
1652 struct mmc_host *mmc = NULL;
1653 int ret;
1654
1655 ret = wbsd_alloc_mmc(dev);
1656 if (ret)
1657 return ret;
1658
1659 mmc = dev_get_drvdata(dev);
1660 host = mmc_priv(mmc);
1661
1662 /*
1663 * Scan for hardware.
1664 */
1665 ret = wbsd_scan(host);
1666 if (ret) {
1667 if (pnp && (ret == -ENODEV)) {
1668 pr_warn(DRIVER_NAME ": Unable to confirm device presence - you may experience lock-ups\n");
1669 } else {
1670 wbsd_free_mmc(dev);
1671 return ret;
1672 }
1673 }
1674
1675 /*
1676 * Request resources.
1677 */
1678 ret = wbsd_request_resources(host, base, irq, dma);
1679 if (ret) {
1680 wbsd_release_resources(host);
1681 wbsd_free_mmc(dev);
1682 return ret;
1683 }
1684
1685 /*
1686 * See if chip needs to be configured.
1687 */
1688 if (pnp) {
1689 if ((host->config != 0) && !wbsd_chip_validate(host)) {
1690 pr_warn(DRIVER_NAME ": PnP active but chip not configured! You probably have a buggy BIOS. Configuring chip manually.\n");
1691 wbsd_chip_config(host);
1692 }
1693 } else
1694 wbsd_chip_config(host);
1695
1696 /*
1697 * Power Management stuff. No idea how this works.
1698 * Not tested.
1699 */
1700#ifdef CONFIG_PM
1701 if (host->config) {
1702 wbsd_unlock_config(host);
1703 wbsd_write_config(host, WBSD_CONF_PME, 0xA0);
1704 wbsd_lock_config(host);
1705 }
1706#endif
1707 /*
1708 * Allow device to initialise itself properly.
1709 */
1710 mdelay(5);
1711
1712 /*
1713 * Reset the chip into a known state.
1714 */
1715 wbsd_init_device(host);
1716
1717 mmc_add_host(mmc);
1718
1719 pr_info("%s: W83L51xD", mmc_hostname(mmc));
1720 if (host->chip_id != 0)
1721 printk(" id %x", (int)host->chip_id);
1722 printk(" at 0x%x irq %d", (int)host->base, (int)host->irq);
1723 if (host->dma >= 0)
1724 printk(" dma %d", (int)host->dma);
1725 else
1726 printk(" FIFO");
1727 if (pnp)
1728 printk(" PnP");
1729 printk("\n");
1730
1731 return 0;
1732}
1733
1734static void wbsd_shutdown(struct device *dev, int pnp)
1735{
1736 struct mmc_host *mmc = dev_get_drvdata(dev);
1737 struct wbsd_host *host;
1738
1739 if (!mmc)
1740 return;
1741
1742 host = mmc_priv(mmc);
1743
1744 mmc_remove_host(mmc);
1745
1746 /*
1747 * Power down the SD/MMC function.
1748 */
1749 if (!pnp)
1750 wbsd_chip_poweroff(host);
1751
1752 wbsd_release_resources(host);
1753
1754 wbsd_free_mmc(dev);
1755}
1756
1757/*
1758 * Non-PnP
1759 */
1760
1761static int wbsd_probe(struct platform_device *dev)
1762{
1763 /* Use the module parameters for resources */
1764 return wbsd_init(&dev->dev, param_io, param_irq, param_dma, 0);
1765}
1766
1767static int wbsd_remove(struct platform_device *dev)
1768{
1769 wbsd_shutdown(&dev->dev, 0);
1770
1771 return 0;
1772}
1773
1774/*
1775 * PnP
1776 */
1777
1778#ifdef CONFIG_PNP
1779
1780static int
1781wbsd_pnp_probe(struct pnp_dev *pnpdev, const struct pnp_device_id *dev_id)
1782{
1783 int io, irq, dma;
1784
1785 /*
1786 * Get resources from PnP layer.
1787 */
1788 io = pnp_port_start(pnpdev, 0);
1789 irq = pnp_irq(pnpdev, 0);
1790 if (pnp_dma_valid(pnpdev, 0))
1791 dma = pnp_dma(pnpdev, 0);
1792 else
1793 dma = -1;
1794
1795 DBGF("PnP resources: port %3x irq %d dma %d\n", io, irq, dma);
1796
1797 return wbsd_init(&pnpdev->dev, io, irq, dma, 1);
1798}
1799
1800static void wbsd_pnp_remove(struct pnp_dev *dev)
1801{
1802 wbsd_shutdown(&dev->dev, 1);
1803}
1804
1805#endif /* CONFIG_PNP */
1806
1807/*
1808 * Power management
1809 */
1810
1811#ifdef CONFIG_PM
1812
1813static int wbsd_platform_suspend(struct platform_device *dev,
1814 pm_message_t state)
1815{
1816 struct mmc_host *mmc = platform_get_drvdata(dev);
1817 struct wbsd_host *host;
1818
1819 if (mmc == NULL)
1820 return 0;
1821
1822 DBGF("Suspending...\n");
1823
1824 host = mmc_priv(mmc);
1825
1826 wbsd_chip_poweroff(host);
1827 return 0;
1828}
1829
1830static int wbsd_platform_resume(struct platform_device *dev)
1831{
1832 struct mmc_host *mmc = platform_get_drvdata(dev);
1833 struct wbsd_host *host;
1834
1835 if (mmc == NULL)
1836 return 0;
1837
1838 DBGF("Resuming...\n");
1839
1840 host = mmc_priv(mmc);
1841
1842 wbsd_chip_config(host);
1843
1844 /*
1845 * Allow device to initialise itself properly.
1846 */
1847 mdelay(5);
1848
1849 wbsd_init_device(host);
1850 return 0;
1851}
1852
1853#ifdef CONFIG_PNP
1854
1855static int wbsd_pnp_suspend(struct pnp_dev *pnp_dev, pm_message_t state)
1856{
1857 struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
1858
1859 if (mmc == NULL)
1860 return 0;
1861
1862 DBGF("Suspending...\n");
1863 return 0;
1864}
1865
1866static int wbsd_pnp_resume(struct pnp_dev *pnp_dev)
1867{
1868 struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
1869 struct wbsd_host *host;
1870
1871 if (mmc == NULL)
1872 return 0;
1873
1874 DBGF("Resuming...\n");
1875
1876 host = mmc_priv(mmc);
1877
1878 /*
1879 * See if chip needs to be configured.
1880 */
1881 if (host->config != 0) {
1882 if (!wbsd_chip_validate(host)) {
1883 pr_warn(DRIVER_NAME ": PnP active but chip not configured! You probably have a buggy BIOS. Configuring chip manually.\n");
1884 wbsd_chip_config(host);
1885 }
1886 }
1887
1888 /*
1889 * Allow device to initialise itself properly.
1890 */
1891 mdelay(5);
1892
1893 wbsd_init_device(host);
1894 return 0;
1895}
1896
1897#endif /* CONFIG_PNP */
1898
1899#else /* CONFIG_PM */
1900
1901#define wbsd_platform_suspend NULL
1902#define wbsd_platform_resume NULL
1903
1904#define wbsd_pnp_suspend NULL
1905#define wbsd_pnp_resume NULL
1906
1907#endif /* CONFIG_PM */
1908
1909static struct platform_device *wbsd_device;
1910
1911static struct platform_driver wbsd_driver = {
1912 .probe = wbsd_probe,
1913 .remove = wbsd_remove,
1914
1915 .suspend = wbsd_platform_suspend,
1916 .resume = wbsd_platform_resume,
1917 .driver = {
1918 .name = DRIVER_NAME,
1919 },
1920};
1921
1922#ifdef CONFIG_PNP
1923
1924static struct pnp_driver wbsd_pnp_driver = {
1925 .name = DRIVER_NAME,
1926 .id_table = pnp_dev_table,
1927 .probe = wbsd_pnp_probe,
1928 .remove = wbsd_pnp_remove,
1929
1930 .suspend = wbsd_pnp_suspend,
1931 .resume = wbsd_pnp_resume,
1932};
1933
1934#endif /* CONFIG_PNP */
1935
1936/*
1937 * Module loading/unloading
1938 */
1939
1940static int __init wbsd_drv_init(void)
1941{
1942 int result;
1943
1944 pr_info(DRIVER_NAME
1945 ": Winbond W83L51xD SD/MMC card interface driver\n");
1946 pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1947
1948#ifdef CONFIG_PNP
1949
1950 if (!param_nopnp) {
1951 result = pnp_register_driver(&wbsd_pnp_driver);
1952 if (result < 0)
1953 return result;
1954 }
1955#endif /* CONFIG_PNP */
1956
1957 if (param_nopnp) {
1958 result = platform_driver_register(&wbsd_driver);
1959 if (result < 0)
1960 return result;
1961
1962 wbsd_device = platform_device_alloc(DRIVER_NAME, -1);
1963 if (!wbsd_device) {
1964 platform_driver_unregister(&wbsd_driver);
1965 return -ENOMEM;
1966 }
1967
1968 result = platform_device_add(wbsd_device);
1969 if (result) {
1970 platform_device_put(wbsd_device);
1971 platform_driver_unregister(&wbsd_driver);
1972 return result;
1973 }
1974 }
1975
1976 return 0;
1977}
1978
1979static void __exit wbsd_drv_exit(void)
1980{
1981#ifdef CONFIG_PNP
1982
1983 if (!param_nopnp)
1984 pnp_unregister_driver(&wbsd_pnp_driver);
1985
1986#endif /* CONFIG_PNP */
1987
1988 if (param_nopnp) {
1989 platform_device_unregister(wbsd_device);
1990
1991 platform_driver_unregister(&wbsd_driver);
1992 }
1993
1994 DBG("unloaded\n");
1995}
1996
1997module_init(wbsd_drv_init);
1998module_exit(wbsd_drv_exit);
1999#ifdef CONFIG_PNP
2000module_param_hw_named(nopnp, param_nopnp, uint, other, 0444);
2001#endif
2002module_param_hw_named(io, param_io, uint, ioport, 0444);
2003module_param_hw_named(irq, param_irq, uint, irq, 0444);
2004module_param_hw_named(dma, param_dma, int, dma, 0444);
2005
2006MODULE_LICENSE("GPL");
2007MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>");
2008MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver");
2009
2010#ifdef CONFIG_PNP
2011MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)");
2012#endif
2013MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)");
2014MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)");
2015MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * linux/drivers/mmc/host/wbsd.c - Winbond W83L51xD SD/MMC driver
4 *
5 * Copyright (C) 2004-2007 Pierre Ossman, All Rights Reserved.
6 *
7 * Warning!
8 *
9 * Changes to the FIFO system should be done with extreme care since
10 * the hardware is full of bugs related to the FIFO. Known issues are:
11 *
12 * - FIFO size field in FSR is always zero.
13 *
14 * - FIFO interrupts tend not to work as they should. Interrupts are
15 * triggered only for full/empty events, not for threshold values.
16 *
17 * - On APIC systems the FIFO empty interrupt is sometimes lost.
18 */
19
20#include <linux/module.h>
21#include <linux/moduleparam.h>
22#include <linux/init.h>
23#include <linux/ioport.h>
24#include <linux/platform_device.h>
25#include <linux/interrupt.h>
26#include <linux/dma-mapping.h>
27#include <linux/delay.h>
28#include <linux/pnp.h>
29#include <linux/highmem.h>
30#include <linux/mmc/host.h>
31#include <linux/scatterlist.h>
32#include <linux/slab.h>
33
34#include <asm/io.h>
35#include <asm/dma.h>
36
37#include "wbsd.h"
38
39#define DRIVER_NAME "wbsd"
40
41#define DBG(x...) \
42 pr_debug(DRIVER_NAME ": " x)
43#define DBGF(f, x...) \
44 pr_debug(DRIVER_NAME " [%s()]: " f, __func__ , ##x)
45
46/*
47 * Device resources
48 */
49
50#ifdef CONFIG_PNP
51
52static const struct pnp_device_id pnp_dev_table[] = {
53 { "WEC0517", 0 },
54 { "WEC0518", 0 },
55 { "", 0 },
56};
57
58MODULE_DEVICE_TABLE(pnp, pnp_dev_table);
59
60#endif /* CONFIG_PNP */
61
62static const int config_ports[] = { 0x2E, 0x4E };
63static const int unlock_codes[] = { 0x83, 0x87 };
64
65static const int valid_ids[] = {
66 0x7112,
67};
68
69#ifdef CONFIG_PNP
70static unsigned int param_nopnp = 0;
71#else
72static const unsigned int param_nopnp = 1;
73#endif
74static unsigned int param_io = 0x248;
75static unsigned int param_irq = 6;
76static int param_dma = 2;
77
78/*
79 * Basic functions
80 */
81
82static inline void wbsd_unlock_config(struct wbsd_host *host)
83{
84 BUG_ON(host->config == 0);
85
86 outb(host->unlock_code, host->config);
87 outb(host->unlock_code, host->config);
88}
89
90static inline void wbsd_lock_config(struct wbsd_host *host)
91{
92 BUG_ON(host->config == 0);
93
94 outb(LOCK_CODE, host->config);
95}
96
97static inline void wbsd_write_config(struct wbsd_host *host, u8 reg, u8 value)
98{
99 BUG_ON(host->config == 0);
100
101 outb(reg, host->config);
102 outb(value, host->config + 1);
103}
104
105static inline u8 wbsd_read_config(struct wbsd_host *host, u8 reg)
106{
107 BUG_ON(host->config == 0);
108
109 outb(reg, host->config);
110 return inb(host->config + 1);
111}
112
113static inline void wbsd_write_index(struct wbsd_host *host, u8 index, u8 value)
114{
115 outb(index, host->base + WBSD_IDXR);
116 outb(value, host->base + WBSD_DATAR);
117}
118
119static inline u8 wbsd_read_index(struct wbsd_host *host, u8 index)
120{
121 outb(index, host->base + WBSD_IDXR);
122 return inb(host->base + WBSD_DATAR);
123}
124
125/*
126 * Common routines
127 */
128
129static void wbsd_init_device(struct wbsd_host *host)
130{
131 u8 setup, ier;
132
133 /*
134 * Reset chip (SD/MMC part) and fifo.
135 */
136 setup = wbsd_read_index(host, WBSD_IDX_SETUP);
137 setup |= WBSD_FIFO_RESET | WBSD_SOFT_RESET;
138 wbsd_write_index(host, WBSD_IDX_SETUP, setup);
139
140 /*
141 * Set DAT3 to input
142 */
143 setup &= ~WBSD_DAT3_H;
144 wbsd_write_index(host, WBSD_IDX_SETUP, setup);
145 host->flags &= ~WBSD_FIGNORE_DETECT;
146
147 /*
148 * Read back default clock.
149 */
150 host->clk = wbsd_read_index(host, WBSD_IDX_CLK);
151
152 /*
153 * Power down port.
154 */
155 outb(WBSD_POWER_N, host->base + WBSD_CSR);
156
157 /*
158 * Set maximum timeout.
159 */
160 wbsd_write_index(host, WBSD_IDX_TAAC, 0x7F);
161
162 /*
163 * Test for card presence
164 */
165 if (inb(host->base + WBSD_CSR) & WBSD_CARDPRESENT)
166 host->flags |= WBSD_FCARD_PRESENT;
167 else
168 host->flags &= ~WBSD_FCARD_PRESENT;
169
170 /*
171 * Enable interesting interrupts.
172 */
173 ier = 0;
174 ier |= WBSD_EINT_CARD;
175 ier |= WBSD_EINT_FIFO_THRE;
176 ier |= WBSD_EINT_CRC;
177 ier |= WBSD_EINT_TIMEOUT;
178 ier |= WBSD_EINT_TC;
179
180 outb(ier, host->base + WBSD_EIR);
181
182 /*
183 * Clear interrupts.
184 */
185 inb(host->base + WBSD_ISR);
186}
187
188static void wbsd_reset(struct wbsd_host *host)
189{
190 u8 setup;
191
192 pr_err("%s: Resetting chip\n", mmc_hostname(host->mmc));
193
194 /*
195 * Soft reset of chip (SD/MMC part).
196 */
197 setup = wbsd_read_index(host, WBSD_IDX_SETUP);
198 setup |= WBSD_SOFT_RESET;
199 wbsd_write_index(host, WBSD_IDX_SETUP, setup);
200}
201
202static void wbsd_request_end(struct wbsd_host *host, struct mmc_request *mrq)
203{
204 unsigned long dmaflags;
205
206 if (host->dma >= 0) {
207 /*
208 * Release ISA DMA controller.
209 */
210 dmaflags = claim_dma_lock();
211 disable_dma(host->dma);
212 clear_dma_ff(host->dma);
213 release_dma_lock(dmaflags);
214
215 /*
216 * Disable DMA on host.
217 */
218 wbsd_write_index(host, WBSD_IDX_DMA, 0);
219 }
220
221 host->mrq = NULL;
222
223 /*
224 * MMC layer might call back into the driver so first unlock.
225 */
226 spin_unlock(&host->lock);
227 mmc_request_done(host->mmc, mrq);
228 spin_lock(&host->lock);
229}
230
231/*
232 * Scatter/gather functions
233 */
234
235static inline void wbsd_init_sg(struct wbsd_host *host, struct mmc_data *data)
236{
237 /*
238 * Get info. about SG list from data structure.
239 */
240 host->cur_sg = data->sg;
241 host->num_sg = data->sg_len;
242
243 host->offset = 0;
244 host->remain = host->cur_sg->length;
245}
246
247static inline int wbsd_next_sg(struct wbsd_host *host)
248{
249 /*
250 * Skip to next SG entry.
251 */
252 host->cur_sg++;
253 host->num_sg--;
254
255 /*
256 * Any entries left?
257 */
258 if (host->num_sg > 0) {
259 host->offset = 0;
260 host->remain = host->cur_sg->length;
261 }
262
263 return host->num_sg;
264}
265
266static inline char *wbsd_map_sg(struct wbsd_host *host)
267{
268 return kmap_atomic(sg_page(host->cur_sg)) + host->cur_sg->offset;
269}
270
271static inline void wbsd_sg_to_dma(struct wbsd_host *host, struct mmc_data *data)
272{
273 size_t len = 0;
274 int i;
275
276 for (i = 0; i < data->sg_len; i++)
277 len += data->sg[i].length;
278 sg_copy_to_buffer(data->sg, data->sg_len, host->dma_buffer, len);
279}
280
281static inline void wbsd_dma_to_sg(struct wbsd_host *host, struct mmc_data *data)
282{
283 size_t len = 0;
284 int i;
285
286 for (i = 0; i < data->sg_len; i++)
287 len += data->sg[i].length;
288 sg_copy_from_buffer(data->sg, data->sg_len, host->dma_buffer, len);
289}
290
291/*
292 * Command handling
293 */
294
295static inline void wbsd_get_short_reply(struct wbsd_host *host,
296 struct mmc_command *cmd)
297{
298 /*
299 * Correct response type?
300 */
301 if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_SHORT) {
302 cmd->error = -EILSEQ;
303 return;
304 }
305
306 cmd->resp[0] = wbsd_read_index(host, WBSD_IDX_RESP12) << 24;
307 cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP13) << 16;
308 cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP14) << 8;
309 cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP15) << 0;
310 cmd->resp[1] = wbsd_read_index(host, WBSD_IDX_RESP16) << 24;
311}
312
313static inline void wbsd_get_long_reply(struct wbsd_host *host,
314 struct mmc_command *cmd)
315{
316 int i;
317
318 /*
319 * Correct response type?
320 */
321 if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_LONG) {
322 cmd->error = -EILSEQ;
323 return;
324 }
325
326 for (i = 0; i < 4; i++) {
327 cmd->resp[i] =
328 wbsd_read_index(host, WBSD_IDX_RESP1 + i * 4) << 24;
329 cmd->resp[i] |=
330 wbsd_read_index(host, WBSD_IDX_RESP2 + i * 4) << 16;
331 cmd->resp[i] |=
332 wbsd_read_index(host, WBSD_IDX_RESP3 + i * 4) << 8;
333 cmd->resp[i] |=
334 wbsd_read_index(host, WBSD_IDX_RESP4 + i * 4) << 0;
335 }
336}
337
338static void wbsd_send_command(struct wbsd_host *host, struct mmc_command *cmd)
339{
340 int i;
341 u8 status, isr;
342
343 /*
344 * Clear accumulated ISR. The interrupt routine
345 * will fill this one with events that occur during
346 * transfer.
347 */
348 host->isr = 0;
349
350 /*
351 * Send the command (CRC calculated by host).
352 */
353 outb(cmd->opcode, host->base + WBSD_CMDR);
354 for (i = 3; i >= 0; i--)
355 outb((cmd->arg >> (i * 8)) & 0xff, host->base + WBSD_CMDR);
356
357 cmd->error = 0;
358
359 /*
360 * Wait for the request to complete.
361 */
362 do {
363 status = wbsd_read_index(host, WBSD_IDX_STATUS);
364 } while (status & WBSD_CARDTRAFFIC);
365
366 /*
367 * Do we expect a reply?
368 */
369 if (cmd->flags & MMC_RSP_PRESENT) {
370 /*
371 * Read back status.
372 */
373 isr = host->isr;
374
375 /* Card removed? */
376 if (isr & WBSD_INT_CARD)
377 cmd->error = -ENOMEDIUM;
378 /* Timeout? */
379 else if (isr & WBSD_INT_TIMEOUT)
380 cmd->error = -ETIMEDOUT;
381 /* CRC? */
382 else if ((cmd->flags & MMC_RSP_CRC) && (isr & WBSD_INT_CRC))
383 cmd->error = -EILSEQ;
384 /* All ok */
385 else {
386 if (cmd->flags & MMC_RSP_136)
387 wbsd_get_long_reply(host, cmd);
388 else
389 wbsd_get_short_reply(host, cmd);
390 }
391 }
392}
393
394/*
395 * Data functions
396 */
397
398static void wbsd_empty_fifo(struct wbsd_host *host)
399{
400 struct mmc_data *data = host->mrq->cmd->data;
401 char *buffer;
402 int i, idx, fsr, fifo;
403
404 /*
405 * Handle excessive data.
406 */
407 if (host->num_sg == 0)
408 return;
409
410 buffer = wbsd_map_sg(host) + host->offset;
411 idx = 0;
412
413 /*
414 * Drain the fifo. This has a tendency to loop longer
415 * than the FIFO length (usually one block).
416 */
417 while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_EMPTY)) {
418 /*
419 * The size field in the FSR is broken so we have to
420 * do some guessing.
421 */
422 if (fsr & WBSD_FIFO_FULL)
423 fifo = 16;
424 else if (fsr & WBSD_FIFO_FUTHRE)
425 fifo = 8;
426 else
427 fifo = 1;
428
429 for (i = 0; i < fifo; i++) {
430 buffer[idx++] = inb(host->base + WBSD_DFR);
431 host->offset++;
432 host->remain--;
433
434 data->bytes_xfered++;
435
436 /*
437 * End of scatter list entry?
438 */
439 if (host->remain == 0) {
440 kunmap_atomic(buffer);
441 /*
442 * Get next entry. Check if last.
443 */
444 if (!wbsd_next_sg(host))
445 return;
446
447 buffer = wbsd_map_sg(host);
448 idx = 0;
449 }
450 }
451 }
452 kunmap_atomic(buffer);
453
454 /*
455 * This is a very dirty hack to solve a
456 * hardware problem. The chip doesn't trigger
457 * FIFO threshold interrupts properly.
458 */
459 if ((data->blocks * data->blksz - data->bytes_xfered) < 16)
460 tasklet_schedule(&host->fifo_tasklet);
461}
462
463static void wbsd_fill_fifo(struct wbsd_host *host)
464{
465 struct mmc_data *data = host->mrq->cmd->data;
466 char *buffer;
467 int i, idx, fsr, fifo;
468
469 /*
470 * Check that we aren't being called after the
471 * entire buffer has been transferred.
472 */
473 if (host->num_sg == 0)
474 return;
475
476 buffer = wbsd_map_sg(host) + host->offset;
477 idx = 0;
478
479 /*
480 * Fill the fifo. This has a tendency to loop longer
481 * than the FIFO length (usually one block).
482 */
483 while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_FULL)) {
484 /*
485 * The size field in the FSR is broken so we have to
486 * do some guessing.
487 */
488 if (fsr & WBSD_FIFO_EMPTY)
489 fifo = 0;
490 else if (fsr & WBSD_FIFO_EMTHRE)
491 fifo = 8;
492 else
493 fifo = 15;
494
495 for (i = 16; i > fifo; i--) {
496 outb(buffer[idx], host->base + WBSD_DFR);
497 host->offset++;
498 host->remain--;
499
500 data->bytes_xfered++;
501
502 /*
503 * End of scatter list entry?
504 */
505 if (host->remain == 0) {
506 kunmap_atomic(buffer);
507 /*
508 * Get next entry. Check if last.
509 */
510 if (!wbsd_next_sg(host))
511 return;
512
513 buffer = wbsd_map_sg(host);
514 idx = 0;
515 }
516 }
517 }
518 kunmap_atomic(buffer);
519
520 /*
521 * The controller stops sending interrupts for
522 * 'FIFO empty' under certain conditions. So we
523 * need to be a bit more pro-active.
524 */
525 tasklet_schedule(&host->fifo_tasklet);
526}
527
528static void wbsd_prepare_data(struct wbsd_host *host, struct mmc_data *data)
529{
530 u16 blksize;
531 u8 setup;
532 unsigned long dmaflags;
533 unsigned int size;
534
535 /*
536 * Calculate size.
537 */
538 size = data->blocks * data->blksz;
539
540 /*
541 * Check timeout values for overflow.
542 * (Yes, some cards cause this value to overflow).
543 */
544 if (data->timeout_ns > 127000000)
545 wbsd_write_index(host, WBSD_IDX_TAAC, 127);
546 else {
547 wbsd_write_index(host, WBSD_IDX_TAAC,
548 data->timeout_ns / 1000000);
549 }
550
551 if (data->timeout_clks > 255)
552 wbsd_write_index(host, WBSD_IDX_NSAC, 255);
553 else
554 wbsd_write_index(host, WBSD_IDX_NSAC, data->timeout_clks);
555
556 /*
557 * Inform the chip of how large blocks will be
558 * sent. It needs this to determine when to
559 * calculate CRC.
560 *
561 * Space for CRC must be included in the size.
562 * Two bytes are needed for each data line.
563 */
564 if (host->bus_width == MMC_BUS_WIDTH_1) {
565 blksize = data->blksz + 2;
566
567 wbsd_write_index(host, WBSD_IDX_PBSMSB, (blksize >> 4) & 0xF0);
568 wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
569 } else if (host->bus_width == MMC_BUS_WIDTH_4) {
570 blksize = data->blksz + 2 * 4;
571
572 wbsd_write_index(host, WBSD_IDX_PBSMSB,
573 ((blksize >> 4) & 0xF0) | WBSD_DATA_WIDTH);
574 wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
575 } else {
576 data->error = -EINVAL;
577 return;
578 }
579
580 /*
581 * Clear the FIFO. This is needed even for DMA
582 * transfers since the chip still uses the FIFO
583 * internally.
584 */
585 setup = wbsd_read_index(host, WBSD_IDX_SETUP);
586 setup |= WBSD_FIFO_RESET;
587 wbsd_write_index(host, WBSD_IDX_SETUP, setup);
588
589 /*
590 * DMA transfer?
591 */
592 if (host->dma >= 0) {
593 /*
594 * The buffer for DMA is only 64 kB.
595 */
596 BUG_ON(size > 0x10000);
597 if (size > 0x10000) {
598 data->error = -EINVAL;
599 return;
600 }
601
602 /*
603 * Transfer data from the SG list to
604 * the DMA buffer.
605 */
606 if (data->flags & MMC_DATA_WRITE)
607 wbsd_sg_to_dma(host, data);
608
609 /*
610 * Initialise the ISA DMA controller.
611 */
612 dmaflags = claim_dma_lock();
613 disable_dma(host->dma);
614 clear_dma_ff(host->dma);
615 if (data->flags & MMC_DATA_READ)
616 set_dma_mode(host->dma, DMA_MODE_READ & ~0x40);
617 else
618 set_dma_mode(host->dma, DMA_MODE_WRITE & ~0x40);
619 set_dma_addr(host->dma, host->dma_addr);
620 set_dma_count(host->dma, size);
621
622 enable_dma(host->dma);
623 release_dma_lock(dmaflags);
624
625 /*
626 * Enable DMA on the host.
627 */
628 wbsd_write_index(host, WBSD_IDX_DMA, WBSD_DMA_ENABLE);
629 } else {
630 /*
631 * This flag is used to keep printk
632 * output to a minimum.
633 */
634 host->firsterr = 1;
635
636 /*
637 * Initialise the SG list.
638 */
639 wbsd_init_sg(host, data);
640
641 /*
642 * Turn off DMA.
643 */
644 wbsd_write_index(host, WBSD_IDX_DMA, 0);
645
646 /*
647 * Set up FIFO threshold levels (and fill
648 * buffer if doing a write).
649 */
650 if (data->flags & MMC_DATA_READ) {
651 wbsd_write_index(host, WBSD_IDX_FIFOEN,
652 WBSD_FIFOEN_FULL | 8);
653 } else {
654 wbsd_write_index(host, WBSD_IDX_FIFOEN,
655 WBSD_FIFOEN_EMPTY | 8);
656 wbsd_fill_fifo(host);
657 }
658 }
659
660 data->error = 0;
661}
662
663static void wbsd_finish_data(struct wbsd_host *host, struct mmc_data *data)
664{
665 unsigned long dmaflags;
666 int count;
667 u8 status;
668
669 WARN_ON(host->mrq == NULL);
670
671 /*
672 * Send a stop command if needed.
673 */
674 if (data->stop)
675 wbsd_send_command(host, data->stop);
676
677 /*
678 * Wait for the controller to leave data
679 * transfer state.
680 */
681 do {
682 status = wbsd_read_index(host, WBSD_IDX_STATUS);
683 } while (status & (WBSD_BLOCK_READ | WBSD_BLOCK_WRITE));
684
685 /*
686 * DMA transfer?
687 */
688 if (host->dma >= 0) {
689 /*
690 * Disable DMA on the host.
691 */
692 wbsd_write_index(host, WBSD_IDX_DMA, 0);
693
694 /*
695 * Turn of ISA DMA controller.
696 */
697 dmaflags = claim_dma_lock();
698 disable_dma(host->dma);
699 clear_dma_ff(host->dma);
700 count = get_dma_residue(host->dma);
701 release_dma_lock(dmaflags);
702
703 data->bytes_xfered = host->mrq->data->blocks *
704 host->mrq->data->blksz - count;
705 data->bytes_xfered -= data->bytes_xfered % data->blksz;
706
707 /*
708 * Any leftover data?
709 */
710 if (count) {
711 pr_err("%s: Incomplete DMA transfer. "
712 "%d bytes left.\n",
713 mmc_hostname(host->mmc), count);
714
715 if (!data->error)
716 data->error = -EIO;
717 } else {
718 /*
719 * Transfer data from DMA buffer to
720 * SG list.
721 */
722 if (data->flags & MMC_DATA_READ)
723 wbsd_dma_to_sg(host, data);
724 }
725
726 if (data->error) {
727 if (data->bytes_xfered)
728 data->bytes_xfered -= data->blksz;
729 }
730 }
731
732 wbsd_request_end(host, host->mrq);
733}
734
735/*****************************************************************************\
736 * *
737 * MMC layer callbacks *
738 * *
739\*****************************************************************************/
740
741static void wbsd_request(struct mmc_host *mmc, struct mmc_request *mrq)
742{
743 struct wbsd_host *host = mmc_priv(mmc);
744 struct mmc_command *cmd;
745
746 /*
747 * Disable tasklets to avoid a deadlock.
748 */
749 spin_lock_bh(&host->lock);
750
751 BUG_ON(host->mrq != NULL);
752
753 cmd = mrq->cmd;
754
755 host->mrq = mrq;
756
757 /*
758 * Check that there is actually a card in the slot.
759 */
760 if (!(host->flags & WBSD_FCARD_PRESENT)) {
761 cmd->error = -ENOMEDIUM;
762 goto done;
763 }
764
765 if (cmd->data) {
766 /*
767 * The hardware is so delightfully stupid that it has a list
768 * of "data" commands. If a command isn't on this list, it'll
769 * just go back to the idle state and won't send any data
770 * interrupts.
771 */
772 switch (cmd->opcode) {
773 case 11:
774 case 17:
775 case 18:
776 case 20:
777 case 24:
778 case 25:
779 case 26:
780 case 27:
781 case 30:
782 case 42:
783 case 56:
784 break;
785
786 /* ACMDs. We don't keep track of state, so we just treat them
787 * like any other command. */
788 case 51:
789 break;
790
791 default:
792 pr_warn("%s: Data command %d is not supported by this controller\n",
793 mmc_hostname(host->mmc), cmd->opcode);
794 cmd->error = -EINVAL;
795
796 goto done;
797 }
798 }
799
800 /*
801 * Does the request include data?
802 */
803 if (cmd->data) {
804 wbsd_prepare_data(host, cmd->data);
805
806 if (cmd->data->error)
807 goto done;
808 }
809
810 wbsd_send_command(host, cmd);
811
812 /*
813 * If this is a data transfer the request
814 * will be finished after the data has
815 * transferred.
816 */
817 if (cmd->data && !cmd->error) {
818 /*
819 * Dirty fix for hardware bug.
820 */
821 if (host->dma == -1)
822 tasklet_schedule(&host->fifo_tasklet);
823
824 spin_unlock_bh(&host->lock);
825
826 return;
827 }
828
829done:
830 wbsd_request_end(host, mrq);
831
832 spin_unlock_bh(&host->lock);
833}
834
835static void wbsd_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
836{
837 struct wbsd_host *host = mmc_priv(mmc);
838 u8 clk, setup, pwr;
839
840 spin_lock_bh(&host->lock);
841
842 /*
843 * Reset the chip on each power off.
844 * Should clear out any weird states.
845 */
846 if (ios->power_mode == MMC_POWER_OFF)
847 wbsd_init_device(host);
848
849 if (ios->clock >= 24000000)
850 clk = WBSD_CLK_24M;
851 else if (ios->clock >= 16000000)
852 clk = WBSD_CLK_16M;
853 else if (ios->clock >= 12000000)
854 clk = WBSD_CLK_12M;
855 else
856 clk = WBSD_CLK_375K;
857
858 /*
859 * Only write to the clock register when
860 * there is an actual change.
861 */
862 if (clk != host->clk) {
863 wbsd_write_index(host, WBSD_IDX_CLK, clk);
864 host->clk = clk;
865 }
866
867 /*
868 * Power up card.
869 */
870 if (ios->power_mode != MMC_POWER_OFF) {
871 pwr = inb(host->base + WBSD_CSR);
872 pwr &= ~WBSD_POWER_N;
873 outb(pwr, host->base + WBSD_CSR);
874 }
875
876 /*
877 * MMC cards need to have pin 1 high during init.
878 * It wreaks havoc with the card detection though so
879 * that needs to be disabled.
880 */
881 setup = wbsd_read_index(host, WBSD_IDX_SETUP);
882 if (ios->chip_select == MMC_CS_HIGH) {
883 BUG_ON(ios->bus_width != MMC_BUS_WIDTH_1);
884 setup |= WBSD_DAT3_H;
885 host->flags |= WBSD_FIGNORE_DETECT;
886 } else {
887 if (setup & WBSD_DAT3_H) {
888 setup &= ~WBSD_DAT3_H;
889
890 /*
891 * We cannot resume card detection immediately
892 * because of capacitance and delays in the chip.
893 */
894 mod_timer(&host->ignore_timer, jiffies + HZ / 100);
895 }
896 }
897 wbsd_write_index(host, WBSD_IDX_SETUP, setup);
898
899 /*
900 * Store bus width for later. Will be used when
901 * setting up the data transfer.
902 */
903 host->bus_width = ios->bus_width;
904
905 spin_unlock_bh(&host->lock);
906}
907
908static int wbsd_get_ro(struct mmc_host *mmc)
909{
910 struct wbsd_host *host = mmc_priv(mmc);
911 u8 csr;
912
913 spin_lock_bh(&host->lock);
914
915 csr = inb(host->base + WBSD_CSR);
916 csr |= WBSD_MSLED;
917 outb(csr, host->base + WBSD_CSR);
918
919 mdelay(1);
920
921 csr = inb(host->base + WBSD_CSR);
922 csr &= ~WBSD_MSLED;
923 outb(csr, host->base + WBSD_CSR);
924
925 spin_unlock_bh(&host->lock);
926
927 return !!(csr & WBSD_WRPT);
928}
929
930static const struct mmc_host_ops wbsd_ops = {
931 .request = wbsd_request,
932 .set_ios = wbsd_set_ios,
933 .get_ro = wbsd_get_ro,
934};
935
936/*****************************************************************************\
937 * *
938 * Interrupt handling *
939 * *
940\*****************************************************************************/
941
942/*
943 * Helper function to reset detection ignore
944 */
945
946static void wbsd_reset_ignore(struct timer_list *t)
947{
948 struct wbsd_host *host = from_timer(host, t, ignore_timer);
949
950 BUG_ON(host == NULL);
951
952 DBG("Resetting card detection ignore\n");
953
954 spin_lock_bh(&host->lock);
955
956 host->flags &= ~WBSD_FIGNORE_DETECT;
957
958 /*
959 * Card status might have changed during the
960 * blackout.
961 */
962 tasklet_schedule(&host->card_tasklet);
963
964 spin_unlock_bh(&host->lock);
965}
966
967/*
968 * Tasklets
969 */
970
971static inline struct mmc_data *wbsd_get_data(struct wbsd_host *host)
972{
973 WARN_ON(!host->mrq);
974 if (!host->mrq)
975 return NULL;
976
977 WARN_ON(!host->mrq->cmd);
978 if (!host->mrq->cmd)
979 return NULL;
980
981 WARN_ON(!host->mrq->cmd->data);
982 if (!host->mrq->cmd->data)
983 return NULL;
984
985 return host->mrq->cmd->data;
986}
987
988static void wbsd_tasklet_card(unsigned long param)
989{
990 struct wbsd_host *host = (struct wbsd_host *)param;
991 u8 csr;
992 int delay = -1;
993
994 spin_lock(&host->lock);
995
996 if (host->flags & WBSD_FIGNORE_DETECT) {
997 spin_unlock(&host->lock);
998 return;
999 }
1000
1001 csr = inb(host->base + WBSD_CSR);
1002 WARN_ON(csr == 0xff);
1003
1004 if (csr & WBSD_CARDPRESENT) {
1005 if (!(host->flags & WBSD_FCARD_PRESENT)) {
1006 DBG("Card inserted\n");
1007 host->flags |= WBSD_FCARD_PRESENT;
1008
1009 delay = 500;
1010 }
1011 } else if (host->flags & WBSD_FCARD_PRESENT) {
1012 DBG("Card removed\n");
1013 host->flags &= ~WBSD_FCARD_PRESENT;
1014
1015 if (host->mrq) {
1016 pr_err("%s: Card removed during transfer!\n",
1017 mmc_hostname(host->mmc));
1018 wbsd_reset(host);
1019
1020 host->mrq->cmd->error = -ENOMEDIUM;
1021 tasklet_schedule(&host->finish_tasklet);
1022 }
1023
1024 delay = 0;
1025 }
1026
1027 /*
1028 * Unlock first since we might get a call back.
1029 */
1030
1031 spin_unlock(&host->lock);
1032
1033 if (delay != -1)
1034 mmc_detect_change(host->mmc, msecs_to_jiffies(delay));
1035}
1036
1037static void wbsd_tasklet_fifo(unsigned long param)
1038{
1039 struct wbsd_host *host = (struct wbsd_host *)param;
1040 struct mmc_data *data;
1041
1042 spin_lock(&host->lock);
1043
1044 if (!host->mrq)
1045 goto end;
1046
1047 data = wbsd_get_data(host);
1048 if (!data)
1049 goto end;
1050
1051 if (data->flags & MMC_DATA_WRITE)
1052 wbsd_fill_fifo(host);
1053 else
1054 wbsd_empty_fifo(host);
1055
1056 /*
1057 * Done?
1058 */
1059 if (host->num_sg == 0) {
1060 wbsd_write_index(host, WBSD_IDX_FIFOEN, 0);
1061 tasklet_schedule(&host->finish_tasklet);
1062 }
1063
1064end:
1065 spin_unlock(&host->lock);
1066}
1067
1068static void wbsd_tasklet_crc(unsigned long param)
1069{
1070 struct wbsd_host *host = (struct wbsd_host *)param;
1071 struct mmc_data *data;
1072
1073 spin_lock(&host->lock);
1074
1075 if (!host->mrq)
1076 goto end;
1077
1078 data = wbsd_get_data(host);
1079 if (!data)
1080 goto end;
1081
1082 DBGF("CRC error\n");
1083
1084 data->error = -EILSEQ;
1085
1086 tasklet_schedule(&host->finish_tasklet);
1087
1088end:
1089 spin_unlock(&host->lock);
1090}
1091
1092static void wbsd_tasklet_timeout(unsigned long param)
1093{
1094 struct wbsd_host *host = (struct wbsd_host *)param;
1095 struct mmc_data *data;
1096
1097 spin_lock(&host->lock);
1098
1099 if (!host->mrq)
1100 goto end;
1101
1102 data = wbsd_get_data(host);
1103 if (!data)
1104 goto end;
1105
1106 DBGF("Timeout\n");
1107
1108 data->error = -ETIMEDOUT;
1109
1110 tasklet_schedule(&host->finish_tasklet);
1111
1112end:
1113 spin_unlock(&host->lock);
1114}
1115
1116static void wbsd_tasklet_finish(unsigned long param)
1117{
1118 struct wbsd_host *host = (struct wbsd_host *)param;
1119 struct mmc_data *data;
1120
1121 spin_lock(&host->lock);
1122
1123 WARN_ON(!host->mrq);
1124 if (!host->mrq)
1125 goto end;
1126
1127 data = wbsd_get_data(host);
1128 if (!data)
1129 goto end;
1130
1131 wbsd_finish_data(host, data);
1132
1133end:
1134 spin_unlock(&host->lock);
1135}
1136
1137/*
1138 * Interrupt handling
1139 */
1140
1141static irqreturn_t wbsd_irq(int irq, void *dev_id)
1142{
1143 struct wbsd_host *host = dev_id;
1144 int isr;
1145
1146 isr = inb(host->base + WBSD_ISR);
1147
1148 /*
1149 * Was it actually our hardware that caused the interrupt?
1150 */
1151 if (isr == 0xff || isr == 0x00)
1152 return IRQ_NONE;
1153
1154 host->isr |= isr;
1155
1156 /*
1157 * Schedule tasklets as needed.
1158 */
1159 if (isr & WBSD_INT_CARD)
1160 tasklet_schedule(&host->card_tasklet);
1161 if (isr & WBSD_INT_FIFO_THRE)
1162 tasklet_schedule(&host->fifo_tasklet);
1163 if (isr & WBSD_INT_CRC)
1164 tasklet_hi_schedule(&host->crc_tasklet);
1165 if (isr & WBSD_INT_TIMEOUT)
1166 tasklet_hi_schedule(&host->timeout_tasklet);
1167 if (isr & WBSD_INT_TC)
1168 tasklet_schedule(&host->finish_tasklet);
1169
1170 return IRQ_HANDLED;
1171}
1172
1173/*****************************************************************************\
1174 * *
1175 * Device initialisation and shutdown *
1176 * *
1177\*****************************************************************************/
1178
1179/*
1180 * Allocate/free MMC structure.
1181 */
1182
1183static int wbsd_alloc_mmc(struct device *dev)
1184{
1185 struct mmc_host *mmc;
1186 struct wbsd_host *host;
1187
1188 /*
1189 * Allocate MMC structure.
1190 */
1191 mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev);
1192 if (!mmc)
1193 return -ENOMEM;
1194
1195 host = mmc_priv(mmc);
1196 host->mmc = mmc;
1197
1198 host->dma = -1;
1199
1200 /*
1201 * Set host parameters.
1202 */
1203 mmc->ops = &wbsd_ops;
1204 mmc->f_min = 375000;
1205 mmc->f_max = 24000000;
1206 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1207 mmc->caps = MMC_CAP_4_BIT_DATA;
1208
1209 spin_lock_init(&host->lock);
1210
1211 /*
1212 * Set up timers
1213 */
1214 timer_setup(&host->ignore_timer, wbsd_reset_ignore, 0);
1215
1216 /*
1217 * Maximum number of segments. Worst case is one sector per segment
1218 * so this will be 64kB/512.
1219 */
1220 mmc->max_segs = 128;
1221
1222 /*
1223 * Maximum request size. Also limited by 64KiB buffer.
1224 */
1225 mmc->max_req_size = 65536;
1226
1227 /*
1228 * Maximum segment size. Could be one segment with the maximum number
1229 * of bytes.
1230 */
1231 mmc->max_seg_size = mmc->max_req_size;
1232
1233 /*
1234 * Maximum block size. We have 12 bits (= 4095) but have to subtract
1235 * space for CRC. So the maximum is 4095 - 4*2 = 4087.
1236 */
1237 mmc->max_blk_size = 4087;
1238
1239 /*
1240 * Maximum block count. There is no real limit so the maximum
1241 * request size will be the only restriction.
1242 */
1243 mmc->max_blk_count = mmc->max_req_size;
1244
1245 dev_set_drvdata(dev, mmc);
1246
1247 return 0;
1248}
1249
1250static void wbsd_free_mmc(struct device *dev)
1251{
1252 struct mmc_host *mmc;
1253 struct wbsd_host *host;
1254
1255 mmc = dev_get_drvdata(dev);
1256 if (!mmc)
1257 return;
1258
1259 host = mmc_priv(mmc);
1260 BUG_ON(host == NULL);
1261
1262 del_timer_sync(&host->ignore_timer);
1263
1264 mmc_free_host(mmc);
1265
1266 dev_set_drvdata(dev, NULL);
1267}
1268
1269/*
1270 * Scan for known chip id:s
1271 */
1272
1273static int wbsd_scan(struct wbsd_host *host)
1274{
1275 int i, j, k;
1276 int id;
1277
1278 /*
1279 * Iterate through all ports, all codes to
1280 * find hardware that is in our known list.
1281 */
1282 for (i = 0; i < ARRAY_SIZE(config_ports); i++) {
1283 if (!request_region(config_ports[i], 2, DRIVER_NAME))
1284 continue;
1285
1286 for (j = 0; j < ARRAY_SIZE(unlock_codes); j++) {
1287 id = 0xFFFF;
1288
1289 host->config = config_ports[i];
1290 host->unlock_code = unlock_codes[j];
1291
1292 wbsd_unlock_config(host);
1293
1294 outb(WBSD_CONF_ID_HI, config_ports[i]);
1295 id = inb(config_ports[i] + 1) << 8;
1296
1297 outb(WBSD_CONF_ID_LO, config_ports[i]);
1298 id |= inb(config_ports[i] + 1);
1299
1300 wbsd_lock_config(host);
1301
1302 for (k = 0; k < ARRAY_SIZE(valid_ids); k++) {
1303 if (id == valid_ids[k]) {
1304 host->chip_id = id;
1305
1306 return 0;
1307 }
1308 }
1309
1310 if (id != 0xFFFF) {
1311 DBG("Unknown hardware (id %x) found at %x\n",
1312 id, config_ports[i]);
1313 }
1314 }
1315
1316 release_region(config_ports[i], 2);
1317 }
1318
1319 host->config = 0;
1320 host->unlock_code = 0;
1321
1322 return -ENODEV;
1323}
1324
1325/*
1326 * Allocate/free io port ranges
1327 */
1328
1329static int wbsd_request_region(struct wbsd_host *host, int base)
1330{
1331 if (base & 0x7)
1332 return -EINVAL;
1333
1334 if (!request_region(base, 8, DRIVER_NAME))
1335 return -EIO;
1336
1337 host->base = base;
1338
1339 return 0;
1340}
1341
1342static void wbsd_release_regions(struct wbsd_host *host)
1343{
1344 if (host->base)
1345 release_region(host->base, 8);
1346
1347 host->base = 0;
1348
1349 if (host->config)
1350 release_region(host->config, 2);
1351
1352 host->config = 0;
1353}
1354
1355/*
1356 * Allocate/free DMA port and buffer
1357 */
1358
1359static void wbsd_request_dma(struct wbsd_host *host, int dma)
1360{
1361 if (dma < 0)
1362 return;
1363
1364 if (request_dma(dma, DRIVER_NAME))
1365 goto err;
1366
1367 /*
1368 * We need to allocate a special buffer in
1369 * order for ISA to be able to DMA to it.
1370 */
1371 host->dma_buffer = kmalloc(WBSD_DMA_SIZE,
1372 GFP_NOIO | GFP_DMA | __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
1373 if (!host->dma_buffer)
1374 goto free;
1375
1376 /*
1377 * Translate the address to a physical address.
1378 */
1379 host->dma_addr = dma_map_single(mmc_dev(host->mmc), host->dma_buffer,
1380 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1381 if (dma_mapping_error(mmc_dev(host->mmc), host->dma_addr))
1382 goto kfree;
1383
1384 /*
1385 * ISA DMA must be aligned on a 64k basis.
1386 */
1387 if ((host->dma_addr & 0xffff) != 0)
1388 goto unmap;
1389 /*
1390 * ISA cannot access memory above 16 MB.
1391 */
1392 else if (host->dma_addr >= 0x1000000)
1393 goto unmap;
1394
1395 host->dma = dma;
1396
1397 return;
1398
1399unmap:
1400 /*
1401 * If we've gotten here then there is some kind of alignment bug
1402 */
1403 BUG_ON(1);
1404
1405 dma_unmap_single(mmc_dev(host->mmc), host->dma_addr,
1406 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1407 host->dma_addr = 0;
1408
1409kfree:
1410 kfree(host->dma_buffer);
1411 host->dma_buffer = NULL;
1412
1413free:
1414 free_dma(dma);
1415
1416err:
1417 pr_warn(DRIVER_NAME ": Unable to allocate DMA %d - falling back on FIFO\n",
1418 dma);
1419}
1420
1421static void wbsd_release_dma(struct wbsd_host *host)
1422{
1423 /*
1424 * host->dma_addr is valid here iff host->dma_buffer is not NULL.
1425 */
1426 if (host->dma_buffer) {
1427 dma_unmap_single(mmc_dev(host->mmc), host->dma_addr,
1428 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1429 kfree(host->dma_buffer);
1430 }
1431 if (host->dma >= 0)
1432 free_dma(host->dma);
1433
1434 host->dma = -1;
1435 host->dma_buffer = NULL;
1436 host->dma_addr = 0;
1437}
1438
1439/*
1440 * Allocate/free IRQ.
1441 */
1442
1443static int wbsd_request_irq(struct wbsd_host *host, int irq)
1444{
1445 int ret;
1446
1447 /*
1448 * Set up tasklets. Must be done before requesting interrupt.
1449 */
1450 tasklet_init(&host->card_tasklet, wbsd_tasklet_card,
1451 (unsigned long)host);
1452 tasklet_init(&host->fifo_tasklet, wbsd_tasklet_fifo,
1453 (unsigned long)host);
1454 tasklet_init(&host->crc_tasklet, wbsd_tasklet_crc,
1455 (unsigned long)host);
1456 tasklet_init(&host->timeout_tasklet, wbsd_tasklet_timeout,
1457 (unsigned long)host);
1458 tasklet_init(&host->finish_tasklet, wbsd_tasklet_finish,
1459 (unsigned long)host);
1460
1461 /*
1462 * Allocate interrupt.
1463 */
1464 ret = request_irq(irq, wbsd_irq, IRQF_SHARED, DRIVER_NAME, host);
1465 if (ret)
1466 return ret;
1467
1468 host->irq = irq;
1469
1470 return 0;
1471}
1472
1473static void wbsd_release_irq(struct wbsd_host *host)
1474{
1475 if (!host->irq)
1476 return;
1477
1478 free_irq(host->irq, host);
1479
1480 host->irq = 0;
1481
1482 tasklet_kill(&host->card_tasklet);
1483 tasklet_kill(&host->fifo_tasklet);
1484 tasklet_kill(&host->crc_tasklet);
1485 tasklet_kill(&host->timeout_tasklet);
1486 tasklet_kill(&host->finish_tasklet);
1487}
1488
1489/*
1490 * Allocate all resources for the host.
1491 */
1492
1493static int wbsd_request_resources(struct wbsd_host *host,
1494 int base, int irq, int dma)
1495{
1496 int ret;
1497
1498 /*
1499 * Allocate I/O ports.
1500 */
1501 ret = wbsd_request_region(host, base);
1502 if (ret)
1503 return ret;
1504
1505 /*
1506 * Allocate interrupt.
1507 */
1508 ret = wbsd_request_irq(host, irq);
1509 if (ret)
1510 return ret;
1511
1512 /*
1513 * Allocate DMA.
1514 */
1515 wbsd_request_dma(host, dma);
1516
1517 return 0;
1518}
1519
1520/*
1521 * Release all resources for the host.
1522 */
1523
1524static void wbsd_release_resources(struct wbsd_host *host)
1525{
1526 wbsd_release_dma(host);
1527 wbsd_release_irq(host);
1528 wbsd_release_regions(host);
1529}
1530
1531/*
1532 * Configure the resources the chip should use.
1533 */
1534
1535static void wbsd_chip_config(struct wbsd_host *host)
1536{
1537 wbsd_unlock_config(host);
1538
1539 /*
1540 * Reset the chip.
1541 */
1542 wbsd_write_config(host, WBSD_CONF_SWRST, 1);
1543 wbsd_write_config(host, WBSD_CONF_SWRST, 0);
1544
1545 /*
1546 * Select SD/MMC function.
1547 */
1548 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1549
1550 /*
1551 * Set up card detection.
1552 */
1553 wbsd_write_config(host, WBSD_CONF_PINS, WBSD_PINS_DETECT_GP11);
1554
1555 /*
1556 * Configure chip
1557 */
1558 wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8);
1559 wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff);
1560
1561 wbsd_write_config(host, WBSD_CONF_IRQ, host->irq);
1562
1563 if (host->dma >= 0)
1564 wbsd_write_config(host, WBSD_CONF_DRQ, host->dma);
1565
1566 /*
1567 * Enable and power up chip.
1568 */
1569 wbsd_write_config(host, WBSD_CONF_ENABLE, 1);
1570 wbsd_write_config(host, WBSD_CONF_POWER, 0x20);
1571
1572 wbsd_lock_config(host);
1573}
1574
1575/*
1576 * Check that configured resources are correct.
1577 */
1578
1579static int wbsd_chip_validate(struct wbsd_host *host)
1580{
1581 int base, irq, dma;
1582
1583 wbsd_unlock_config(host);
1584
1585 /*
1586 * Select SD/MMC function.
1587 */
1588 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1589
1590 /*
1591 * Read configuration.
1592 */
1593 base = wbsd_read_config(host, WBSD_CONF_PORT_HI) << 8;
1594 base |= wbsd_read_config(host, WBSD_CONF_PORT_LO);
1595
1596 irq = wbsd_read_config(host, WBSD_CONF_IRQ);
1597
1598 dma = wbsd_read_config(host, WBSD_CONF_DRQ);
1599
1600 wbsd_lock_config(host);
1601
1602 /*
1603 * Validate against given configuration.
1604 */
1605 if (base != host->base)
1606 return 0;
1607 if (irq != host->irq)
1608 return 0;
1609 if ((dma != host->dma) && (host->dma != -1))
1610 return 0;
1611
1612 return 1;
1613}
1614
1615/*
1616 * Powers down the SD function
1617 */
1618
1619static void wbsd_chip_poweroff(struct wbsd_host *host)
1620{
1621 wbsd_unlock_config(host);
1622
1623 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1624 wbsd_write_config(host, WBSD_CONF_ENABLE, 0);
1625
1626 wbsd_lock_config(host);
1627}
1628
1629/*****************************************************************************\
1630 * *
1631 * Devices setup and shutdown *
1632 * *
1633\*****************************************************************************/
1634
1635static int wbsd_init(struct device *dev, int base, int irq, int dma,
1636 int pnp)
1637{
1638 struct wbsd_host *host = NULL;
1639 struct mmc_host *mmc = NULL;
1640 int ret;
1641
1642 ret = wbsd_alloc_mmc(dev);
1643 if (ret)
1644 return ret;
1645
1646 mmc = dev_get_drvdata(dev);
1647 host = mmc_priv(mmc);
1648
1649 /*
1650 * Scan for hardware.
1651 */
1652 ret = wbsd_scan(host);
1653 if (ret) {
1654 if (pnp && (ret == -ENODEV)) {
1655 pr_warn(DRIVER_NAME ": Unable to confirm device presence - you may experience lock-ups\n");
1656 } else {
1657 wbsd_free_mmc(dev);
1658 return ret;
1659 }
1660 }
1661
1662 /*
1663 * Request resources.
1664 */
1665 ret = wbsd_request_resources(host, base, irq, dma);
1666 if (ret) {
1667 wbsd_release_resources(host);
1668 wbsd_free_mmc(dev);
1669 return ret;
1670 }
1671
1672 /*
1673 * See if chip needs to be configured.
1674 */
1675 if (pnp) {
1676 if ((host->config != 0) && !wbsd_chip_validate(host)) {
1677 pr_warn(DRIVER_NAME ": PnP active but chip not configured! You probably have a buggy BIOS. Configuring chip manually.\n");
1678 wbsd_chip_config(host);
1679 }
1680 } else
1681 wbsd_chip_config(host);
1682
1683 /*
1684 * Power Management stuff. No idea how this works.
1685 * Not tested.
1686 */
1687#ifdef CONFIG_PM
1688 if (host->config) {
1689 wbsd_unlock_config(host);
1690 wbsd_write_config(host, WBSD_CONF_PME, 0xA0);
1691 wbsd_lock_config(host);
1692 }
1693#endif
1694 /*
1695 * Allow device to initialise itself properly.
1696 */
1697 mdelay(5);
1698
1699 /*
1700 * Reset the chip into a known state.
1701 */
1702 wbsd_init_device(host);
1703
1704 mmc_add_host(mmc);
1705
1706 pr_info("%s: W83L51xD", mmc_hostname(mmc));
1707 if (host->chip_id != 0)
1708 printk(" id %x", (int)host->chip_id);
1709 printk(" at 0x%x irq %d", (int)host->base, (int)host->irq);
1710 if (host->dma >= 0)
1711 printk(" dma %d", (int)host->dma);
1712 else
1713 printk(" FIFO");
1714 if (pnp)
1715 printk(" PnP");
1716 printk("\n");
1717
1718 return 0;
1719}
1720
1721static void wbsd_shutdown(struct device *dev, int pnp)
1722{
1723 struct mmc_host *mmc = dev_get_drvdata(dev);
1724 struct wbsd_host *host;
1725
1726 if (!mmc)
1727 return;
1728
1729 host = mmc_priv(mmc);
1730
1731 mmc_remove_host(mmc);
1732
1733 /*
1734 * Power down the SD/MMC function.
1735 */
1736 if (!pnp)
1737 wbsd_chip_poweroff(host);
1738
1739 wbsd_release_resources(host);
1740
1741 wbsd_free_mmc(dev);
1742}
1743
1744/*
1745 * Non-PnP
1746 */
1747
1748static int wbsd_probe(struct platform_device *dev)
1749{
1750 /* Use the module parameters for resources */
1751 return wbsd_init(&dev->dev, param_io, param_irq, param_dma, 0);
1752}
1753
1754static int wbsd_remove(struct platform_device *dev)
1755{
1756 wbsd_shutdown(&dev->dev, 0);
1757
1758 return 0;
1759}
1760
1761/*
1762 * PnP
1763 */
1764
1765#ifdef CONFIG_PNP
1766
1767static int
1768wbsd_pnp_probe(struct pnp_dev *pnpdev, const struct pnp_device_id *dev_id)
1769{
1770 int io, irq, dma;
1771
1772 /*
1773 * Get resources from PnP layer.
1774 */
1775 io = pnp_port_start(pnpdev, 0);
1776 irq = pnp_irq(pnpdev, 0);
1777 if (pnp_dma_valid(pnpdev, 0))
1778 dma = pnp_dma(pnpdev, 0);
1779 else
1780 dma = -1;
1781
1782 DBGF("PnP resources: port %3x irq %d dma %d\n", io, irq, dma);
1783
1784 return wbsd_init(&pnpdev->dev, io, irq, dma, 1);
1785}
1786
1787static void wbsd_pnp_remove(struct pnp_dev *dev)
1788{
1789 wbsd_shutdown(&dev->dev, 1);
1790}
1791
1792#endif /* CONFIG_PNP */
1793
1794/*
1795 * Power management
1796 */
1797
1798#ifdef CONFIG_PM
1799
1800static int wbsd_platform_suspend(struct platform_device *dev,
1801 pm_message_t state)
1802{
1803 struct mmc_host *mmc = platform_get_drvdata(dev);
1804 struct wbsd_host *host;
1805
1806 if (mmc == NULL)
1807 return 0;
1808
1809 DBGF("Suspending...\n");
1810
1811 host = mmc_priv(mmc);
1812
1813 wbsd_chip_poweroff(host);
1814 return 0;
1815}
1816
1817static int wbsd_platform_resume(struct platform_device *dev)
1818{
1819 struct mmc_host *mmc = platform_get_drvdata(dev);
1820 struct wbsd_host *host;
1821
1822 if (mmc == NULL)
1823 return 0;
1824
1825 DBGF("Resuming...\n");
1826
1827 host = mmc_priv(mmc);
1828
1829 wbsd_chip_config(host);
1830
1831 /*
1832 * Allow device to initialise itself properly.
1833 */
1834 mdelay(5);
1835
1836 wbsd_init_device(host);
1837 return 0;
1838}
1839
1840#ifdef CONFIG_PNP
1841
1842static int wbsd_pnp_suspend(struct pnp_dev *pnp_dev, pm_message_t state)
1843{
1844 struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
1845
1846 if (mmc == NULL)
1847 return 0;
1848
1849 DBGF("Suspending...\n");
1850 return 0;
1851}
1852
1853static int wbsd_pnp_resume(struct pnp_dev *pnp_dev)
1854{
1855 struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
1856 struct wbsd_host *host;
1857
1858 if (mmc == NULL)
1859 return 0;
1860
1861 DBGF("Resuming...\n");
1862
1863 host = mmc_priv(mmc);
1864
1865 /*
1866 * See if chip needs to be configured.
1867 */
1868 if (host->config != 0) {
1869 if (!wbsd_chip_validate(host)) {
1870 pr_warn(DRIVER_NAME ": PnP active but chip not configured! You probably have a buggy BIOS. Configuring chip manually.\n");
1871 wbsd_chip_config(host);
1872 }
1873 }
1874
1875 /*
1876 * Allow device to initialise itself properly.
1877 */
1878 mdelay(5);
1879
1880 wbsd_init_device(host);
1881 return 0;
1882}
1883
1884#endif /* CONFIG_PNP */
1885
1886#else /* CONFIG_PM */
1887
1888#define wbsd_platform_suspend NULL
1889#define wbsd_platform_resume NULL
1890
1891#define wbsd_pnp_suspend NULL
1892#define wbsd_pnp_resume NULL
1893
1894#endif /* CONFIG_PM */
1895
1896static struct platform_device *wbsd_device;
1897
1898static struct platform_driver wbsd_driver = {
1899 .probe = wbsd_probe,
1900 .remove = wbsd_remove,
1901
1902 .suspend = wbsd_platform_suspend,
1903 .resume = wbsd_platform_resume,
1904 .driver = {
1905 .name = DRIVER_NAME,
1906 },
1907};
1908
1909#ifdef CONFIG_PNP
1910
1911static struct pnp_driver wbsd_pnp_driver = {
1912 .name = DRIVER_NAME,
1913 .id_table = pnp_dev_table,
1914 .probe = wbsd_pnp_probe,
1915 .remove = wbsd_pnp_remove,
1916
1917 .suspend = wbsd_pnp_suspend,
1918 .resume = wbsd_pnp_resume,
1919};
1920
1921#endif /* CONFIG_PNP */
1922
1923/*
1924 * Module loading/unloading
1925 */
1926
1927static int __init wbsd_drv_init(void)
1928{
1929 int result;
1930
1931 pr_info(DRIVER_NAME
1932 ": Winbond W83L51xD SD/MMC card interface driver\n");
1933 pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1934
1935#ifdef CONFIG_PNP
1936
1937 if (!param_nopnp) {
1938 result = pnp_register_driver(&wbsd_pnp_driver);
1939 if (result < 0)
1940 return result;
1941 }
1942#endif /* CONFIG_PNP */
1943
1944 if (param_nopnp) {
1945 result = platform_driver_register(&wbsd_driver);
1946 if (result < 0)
1947 return result;
1948
1949 wbsd_device = platform_device_alloc(DRIVER_NAME, -1);
1950 if (!wbsd_device) {
1951 platform_driver_unregister(&wbsd_driver);
1952 return -ENOMEM;
1953 }
1954
1955 result = platform_device_add(wbsd_device);
1956 if (result) {
1957 platform_device_put(wbsd_device);
1958 platform_driver_unregister(&wbsd_driver);
1959 return result;
1960 }
1961 }
1962
1963 return 0;
1964}
1965
1966static void __exit wbsd_drv_exit(void)
1967{
1968#ifdef CONFIG_PNP
1969
1970 if (!param_nopnp)
1971 pnp_unregister_driver(&wbsd_pnp_driver);
1972
1973#endif /* CONFIG_PNP */
1974
1975 if (param_nopnp) {
1976 platform_device_unregister(wbsd_device);
1977
1978 platform_driver_unregister(&wbsd_driver);
1979 }
1980
1981 DBG("unloaded\n");
1982}
1983
1984module_init(wbsd_drv_init);
1985module_exit(wbsd_drv_exit);
1986#ifdef CONFIG_PNP
1987module_param_hw_named(nopnp, param_nopnp, uint, other, 0444);
1988#endif
1989module_param_hw_named(io, param_io, uint, ioport, 0444);
1990module_param_hw_named(irq, param_irq, uint, irq, 0444);
1991module_param_hw_named(dma, param_dma, int, dma, 0444);
1992
1993MODULE_LICENSE("GPL");
1994MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>");
1995MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver");
1996
1997#ifdef CONFIG_PNP
1998MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)");
1999#endif
2000MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)");
2001MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)");
2002MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)");