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