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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 dev_set_drvdata(dev, NULL);
1269}
1270
1271/*
1272 * Scan for known chip id:s
1273 */
1274
1275static int wbsd_scan(struct wbsd_host *host)
1276{
1277 int i, j, k;
1278 int id;
1279
1280 /*
1281 * Iterate through all ports, all codes to
1282 * find hardware that is in our known list.
1283 */
1284 for (i = 0; i < ARRAY_SIZE(config_ports); i++) {
1285 if (!request_region(config_ports[i], 2, DRIVER_NAME))
1286 continue;
1287
1288 for (j = 0; j < ARRAY_SIZE(unlock_codes); j++) {
1289 id = 0xFFFF;
1290
1291 host->config = config_ports[i];
1292 host->unlock_code = unlock_codes[j];
1293
1294 wbsd_unlock_config(host);
1295
1296 outb(WBSD_CONF_ID_HI, config_ports[i]);
1297 id = inb(config_ports[i] + 1) << 8;
1298
1299 outb(WBSD_CONF_ID_LO, config_ports[i]);
1300 id |= inb(config_ports[i] + 1);
1301
1302 wbsd_lock_config(host);
1303
1304 for (k = 0; k < ARRAY_SIZE(valid_ids); k++) {
1305 if (id == valid_ids[k]) {
1306 host->chip_id = id;
1307
1308 return 0;
1309 }
1310 }
1311
1312 if (id != 0xFFFF) {
1313 DBG("Unknown hardware (id %x) found at %x\n",
1314 id, config_ports[i]);
1315 }
1316 }
1317
1318 release_region(config_ports[i], 2);
1319 }
1320
1321 host->config = 0;
1322 host->unlock_code = 0;
1323
1324 return -ENODEV;
1325}
1326
1327/*
1328 * Allocate/free io port ranges
1329 */
1330
1331static int wbsd_request_region(struct wbsd_host *host, int base)
1332{
1333 if (base & 0x7)
1334 return -EINVAL;
1335
1336 if (!request_region(base, 8, DRIVER_NAME))
1337 return -EIO;
1338
1339 host->base = base;
1340
1341 return 0;
1342}
1343
1344static void wbsd_release_regions(struct wbsd_host *host)
1345{
1346 if (host->base)
1347 release_region(host->base, 8);
1348
1349 host->base = 0;
1350
1351 if (host->config)
1352 release_region(host->config, 2);
1353
1354 host->config = 0;
1355}
1356
1357/*
1358 * Allocate/free DMA port and buffer
1359 */
1360
1361static void wbsd_request_dma(struct wbsd_host *host, int dma)
1362{
1363 if (dma < 0)
1364 return;
1365
1366 if (request_dma(dma, DRIVER_NAME))
1367 goto err;
1368
1369 /*
1370 * We need to allocate a special buffer in
1371 * order for ISA to be able to DMA to it.
1372 */
1373 host->dma_buffer = kmalloc(WBSD_DMA_SIZE,
1374 GFP_NOIO | GFP_DMA | __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
1375 if (!host->dma_buffer)
1376 goto free;
1377
1378 /*
1379 * Translate the address to a physical address.
1380 */
1381 host->dma_addr = dma_map_single(mmc_dev(host->mmc), host->dma_buffer,
1382 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1383 if (dma_mapping_error(mmc_dev(host->mmc), host->dma_addr))
1384 goto kfree;
1385
1386 /*
1387 * ISA DMA must be aligned on a 64k basis.
1388 */
1389 if ((host->dma_addr & 0xffff) != 0)
1390 goto unmap;
1391 /*
1392 * ISA cannot access memory above 16 MB.
1393 */
1394 else if (host->dma_addr >= 0x1000000)
1395 goto unmap;
1396
1397 host->dma = dma;
1398
1399 return;
1400
1401unmap:
1402 /*
1403 * If we've gotten here then there is some kind of alignment bug
1404 */
1405 BUG_ON(1);
1406
1407 dma_unmap_single(mmc_dev(host->mmc), host->dma_addr,
1408 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1409 host->dma_addr = 0;
1410
1411kfree:
1412 kfree(host->dma_buffer);
1413 host->dma_buffer = NULL;
1414
1415free:
1416 free_dma(dma);
1417
1418err:
1419 pr_warn(DRIVER_NAME ": Unable to allocate DMA %d - falling back on FIFO\n",
1420 dma);
1421}
1422
1423static void wbsd_release_dma(struct wbsd_host *host)
1424{
1425 /*
1426 * host->dma_addr is valid here iff host->dma_buffer is not NULL.
1427 */
1428 if (host->dma_buffer) {
1429 dma_unmap_single(mmc_dev(host->mmc), host->dma_addr,
1430 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1431 kfree(host->dma_buffer);
1432 }
1433 if (host->dma >= 0)
1434 free_dma(host->dma);
1435
1436 host->dma = -1;
1437 host->dma_buffer = NULL;
1438 host->dma_addr = 0;
1439}
1440
1441/*
1442 * Allocate/free IRQ.
1443 */
1444
1445static int wbsd_request_irq(struct wbsd_host *host, int irq)
1446{
1447 int ret;
1448
1449 /*
1450 * Set up tasklets. Must be done before requesting interrupt.
1451 */
1452 tasklet_setup(&host->card_tasklet, wbsd_tasklet_card);
1453 tasklet_setup(&host->fifo_tasklet, wbsd_tasklet_fifo);
1454 tasklet_setup(&host->crc_tasklet, wbsd_tasklet_crc);
1455 tasklet_setup(&host->timeout_tasklet, wbsd_tasklet_timeout);
1456 tasklet_setup(&host->finish_tasklet, wbsd_tasklet_finish);
1457
1458 /*
1459 * Allocate interrupt.
1460 */
1461 ret = request_irq(irq, wbsd_irq, IRQF_SHARED, DRIVER_NAME, host);
1462 if (ret)
1463 return ret;
1464
1465 host->irq = irq;
1466
1467 return 0;
1468}
1469
1470static void wbsd_release_irq(struct wbsd_host *host)
1471{
1472 if (!host->irq)
1473 return;
1474
1475 free_irq(host->irq, host);
1476
1477 host->irq = 0;
1478
1479 tasklet_kill(&host->card_tasklet);
1480 tasklet_kill(&host->fifo_tasklet);
1481 tasklet_kill(&host->crc_tasklet);
1482 tasklet_kill(&host->timeout_tasklet);
1483 tasklet_kill(&host->finish_tasklet);
1484}
1485
1486/*
1487 * Allocate all resources for the host.
1488 */
1489
1490static int wbsd_request_resources(struct wbsd_host *host,
1491 int base, int irq, int dma)
1492{
1493 int ret;
1494
1495 /*
1496 * Allocate I/O ports.
1497 */
1498 ret = wbsd_request_region(host, base);
1499 if (ret)
1500 return ret;
1501
1502 /*
1503 * Allocate interrupt.
1504 */
1505 ret = wbsd_request_irq(host, irq);
1506 if (ret)
1507 return ret;
1508
1509 /*
1510 * Allocate DMA.
1511 */
1512 wbsd_request_dma(host, dma);
1513
1514 return 0;
1515}
1516
1517/*
1518 * Release all resources for the host.
1519 */
1520
1521static void wbsd_release_resources(struct wbsd_host *host)
1522{
1523 wbsd_release_dma(host);
1524 wbsd_release_irq(host);
1525 wbsd_release_regions(host);
1526}
1527
1528/*
1529 * Configure the resources the chip should use.
1530 */
1531
1532static void wbsd_chip_config(struct wbsd_host *host)
1533{
1534 wbsd_unlock_config(host);
1535
1536 /*
1537 * Reset the chip.
1538 */
1539 wbsd_write_config(host, WBSD_CONF_SWRST, 1);
1540 wbsd_write_config(host, WBSD_CONF_SWRST, 0);
1541
1542 /*
1543 * Select SD/MMC function.
1544 */
1545 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1546
1547 /*
1548 * Set up card detection.
1549 */
1550 wbsd_write_config(host, WBSD_CONF_PINS, WBSD_PINS_DETECT_GP11);
1551
1552 /*
1553 * Configure chip
1554 */
1555 wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8);
1556 wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff);
1557
1558 wbsd_write_config(host, WBSD_CONF_IRQ, host->irq);
1559
1560 if (host->dma >= 0)
1561 wbsd_write_config(host, WBSD_CONF_DRQ, host->dma);
1562
1563 /*
1564 * Enable and power up chip.
1565 */
1566 wbsd_write_config(host, WBSD_CONF_ENABLE, 1);
1567 wbsd_write_config(host, WBSD_CONF_POWER, 0x20);
1568
1569 wbsd_lock_config(host);
1570}
1571
1572/*
1573 * Check that configured resources are correct.
1574 */
1575
1576static int wbsd_chip_validate(struct wbsd_host *host)
1577{
1578 int base, irq, dma;
1579
1580 wbsd_unlock_config(host);
1581
1582 /*
1583 * Select SD/MMC function.
1584 */
1585 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1586
1587 /*
1588 * Read configuration.
1589 */
1590 base = wbsd_read_config(host, WBSD_CONF_PORT_HI) << 8;
1591 base |= wbsd_read_config(host, WBSD_CONF_PORT_LO);
1592
1593 irq = wbsd_read_config(host, WBSD_CONF_IRQ);
1594
1595 dma = wbsd_read_config(host, WBSD_CONF_DRQ);
1596
1597 wbsd_lock_config(host);
1598
1599 /*
1600 * Validate against given configuration.
1601 */
1602 if (base != host->base)
1603 return 0;
1604 if (irq != host->irq)
1605 return 0;
1606 if ((dma != host->dma) && (host->dma != -1))
1607 return 0;
1608
1609 return 1;
1610}
1611
1612/*
1613 * Powers down the SD function
1614 */
1615
1616static void wbsd_chip_poweroff(struct wbsd_host *host)
1617{
1618 wbsd_unlock_config(host);
1619
1620 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1621 wbsd_write_config(host, WBSD_CONF_ENABLE, 0);
1622
1623 wbsd_lock_config(host);
1624}
1625
1626/*****************************************************************************\
1627 * *
1628 * Devices setup and shutdown *
1629 * *
1630\*****************************************************************************/
1631
1632static int wbsd_init(struct device *dev, int base, int irq, int dma,
1633 int pnp)
1634{
1635 struct wbsd_host *host = NULL;
1636 struct mmc_host *mmc = NULL;
1637 int ret;
1638
1639 ret = wbsd_alloc_mmc(dev);
1640 if (ret)
1641 return ret;
1642
1643 mmc = dev_get_drvdata(dev);
1644 host = mmc_priv(mmc);
1645
1646 /*
1647 * Scan for hardware.
1648 */
1649 ret = wbsd_scan(host);
1650 if (ret) {
1651 if (pnp && (ret == -ENODEV)) {
1652 pr_warn(DRIVER_NAME ": Unable to confirm device presence - you may experience lock-ups\n");
1653 } else {
1654 wbsd_free_mmc(dev);
1655 return ret;
1656 }
1657 }
1658
1659 /*
1660 * Request resources.
1661 */
1662 ret = wbsd_request_resources(host, base, irq, dma);
1663 if (ret) {
1664 wbsd_release_resources(host);
1665 wbsd_free_mmc(dev);
1666 return ret;
1667 }
1668
1669 /*
1670 * See if chip needs to be configured.
1671 */
1672 if (pnp) {
1673 if ((host->config != 0) && !wbsd_chip_validate(host)) {
1674 pr_warn(DRIVER_NAME ": PnP active but chip not configured! You probably have a buggy BIOS. Configuring chip manually.\n");
1675 wbsd_chip_config(host);
1676 }
1677 } else
1678 wbsd_chip_config(host);
1679
1680 /*
1681 * Power Management stuff. No idea how this works.
1682 * Not tested.
1683 */
1684#ifdef CONFIG_PM
1685 if (host->config) {
1686 wbsd_unlock_config(host);
1687 wbsd_write_config(host, WBSD_CONF_PME, 0xA0);
1688 wbsd_lock_config(host);
1689 }
1690#endif
1691 /*
1692 * Allow device to initialise itself properly.
1693 */
1694 mdelay(5);
1695
1696 /*
1697 * Reset the chip into a known state.
1698 */
1699 wbsd_init_device(host);
1700
1701 ret = mmc_add_host(mmc);
1702 if (ret) {
1703 if (!pnp)
1704 wbsd_chip_poweroff(host);
1705
1706 wbsd_release_resources(host);
1707 wbsd_free_mmc(dev);
1708
1709 mmc_free_host(mmc);
1710 return ret;
1711 }
1712
1713 pr_info("%s: W83L51xD", mmc_hostname(mmc));
1714 if (host->chip_id != 0)
1715 printk(" id %x", (int)host->chip_id);
1716 printk(" at 0x%x irq %d", (int)host->base, (int)host->irq);
1717 if (host->dma >= 0)
1718 printk(" dma %d", (int)host->dma);
1719 else
1720 printk(" FIFO");
1721 if (pnp)
1722 printk(" PnP");
1723 printk("\n");
1724
1725 return 0;
1726}
1727
1728static void wbsd_shutdown(struct device *dev, int pnp)
1729{
1730 struct mmc_host *mmc = dev_get_drvdata(dev);
1731 struct wbsd_host *host;
1732
1733 if (!mmc)
1734 return;
1735
1736 host = mmc_priv(mmc);
1737
1738 mmc_remove_host(mmc);
1739
1740 /*
1741 * Power down the SD/MMC function.
1742 */
1743 if (!pnp)
1744 wbsd_chip_poweroff(host);
1745
1746 wbsd_release_resources(host);
1747
1748 wbsd_free_mmc(dev);
1749}
1750
1751/*
1752 * Non-PnP
1753 */
1754
1755static int wbsd_probe(struct platform_device *dev)
1756{
1757 /* Use the module parameters for resources */
1758 return wbsd_init(&dev->dev, param_io, param_irq, param_dma, 0);
1759}
1760
1761static int wbsd_remove(struct platform_device *dev)
1762{
1763 wbsd_shutdown(&dev->dev, 0);
1764
1765 return 0;
1766}
1767
1768/*
1769 * PnP
1770 */
1771
1772#ifdef CONFIG_PNP
1773
1774static int
1775wbsd_pnp_probe(struct pnp_dev *pnpdev, const struct pnp_device_id *dev_id)
1776{
1777 int io, irq, dma;
1778
1779 /*
1780 * Get resources from PnP layer.
1781 */
1782 io = pnp_port_start(pnpdev, 0);
1783 irq = pnp_irq(pnpdev, 0);
1784 if (pnp_dma_valid(pnpdev, 0))
1785 dma = pnp_dma(pnpdev, 0);
1786 else
1787 dma = -1;
1788
1789 DBGF("PnP resources: port %3x irq %d dma %d\n", io, irq, dma);
1790
1791 return wbsd_init(&pnpdev->dev, io, irq, dma, 1);
1792}
1793
1794static void wbsd_pnp_remove(struct pnp_dev *dev)
1795{
1796 wbsd_shutdown(&dev->dev, 1);
1797}
1798
1799#endif /* CONFIG_PNP */
1800
1801/*
1802 * Power management
1803 */
1804
1805#ifdef CONFIG_PM
1806
1807static int wbsd_platform_suspend(struct platform_device *dev,
1808 pm_message_t state)
1809{
1810 struct mmc_host *mmc = platform_get_drvdata(dev);
1811 struct wbsd_host *host;
1812
1813 if (mmc == NULL)
1814 return 0;
1815
1816 DBGF("Suspending...\n");
1817
1818 host = mmc_priv(mmc);
1819
1820 wbsd_chip_poweroff(host);
1821 return 0;
1822}
1823
1824static int wbsd_platform_resume(struct platform_device *dev)
1825{
1826 struct mmc_host *mmc = platform_get_drvdata(dev);
1827 struct wbsd_host *host;
1828
1829 if (mmc == NULL)
1830 return 0;
1831
1832 DBGF("Resuming...\n");
1833
1834 host = mmc_priv(mmc);
1835
1836 wbsd_chip_config(host);
1837
1838 /*
1839 * Allow device to initialise itself properly.
1840 */
1841 mdelay(5);
1842
1843 wbsd_init_device(host);
1844 return 0;
1845}
1846
1847#ifdef CONFIG_PNP
1848
1849static int wbsd_pnp_suspend(struct pnp_dev *pnp_dev, pm_message_t state)
1850{
1851 struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
1852
1853 if (mmc == NULL)
1854 return 0;
1855
1856 DBGF("Suspending...\n");
1857 return 0;
1858}
1859
1860static int wbsd_pnp_resume(struct pnp_dev *pnp_dev)
1861{
1862 struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
1863 struct wbsd_host *host;
1864
1865 if (mmc == NULL)
1866 return 0;
1867
1868 DBGF("Resuming...\n");
1869
1870 host = mmc_priv(mmc);
1871
1872 /*
1873 * See if chip needs to be configured.
1874 */
1875 if (host->config != 0) {
1876 if (!wbsd_chip_validate(host)) {
1877 pr_warn(DRIVER_NAME ": PnP active but chip not configured! You probably have a buggy BIOS. Configuring chip manually.\n");
1878 wbsd_chip_config(host);
1879 }
1880 }
1881
1882 /*
1883 * Allow device to initialise itself properly.
1884 */
1885 mdelay(5);
1886
1887 wbsd_init_device(host);
1888 return 0;
1889}
1890
1891#endif /* CONFIG_PNP */
1892
1893#else /* CONFIG_PM */
1894
1895#define wbsd_platform_suspend NULL
1896#define wbsd_platform_resume NULL
1897
1898#define wbsd_pnp_suspend NULL
1899#define wbsd_pnp_resume NULL
1900
1901#endif /* CONFIG_PM */
1902
1903static struct platform_device *wbsd_device;
1904
1905static struct platform_driver wbsd_driver = {
1906 .probe = wbsd_probe,
1907 .remove = wbsd_remove,
1908
1909 .suspend = wbsd_platform_suspend,
1910 .resume = wbsd_platform_resume,
1911 .driver = {
1912 .name = DRIVER_NAME,
1913 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1914 },
1915};
1916
1917#ifdef CONFIG_PNP
1918
1919static struct pnp_driver wbsd_pnp_driver = {
1920 .name = DRIVER_NAME,
1921 .id_table = pnp_dev_table,
1922 .probe = wbsd_pnp_probe,
1923 .remove = wbsd_pnp_remove,
1924
1925 .suspend = wbsd_pnp_suspend,
1926 .resume = wbsd_pnp_resume,
1927};
1928
1929#endif /* CONFIG_PNP */
1930
1931/*
1932 * Module loading/unloading
1933 */
1934
1935static int __init wbsd_drv_init(void)
1936{
1937 int result;
1938
1939 pr_info(DRIVER_NAME
1940 ": Winbond W83L51xD SD/MMC card interface driver\n");
1941 pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1942
1943#ifdef CONFIG_PNP
1944
1945 if (!param_nopnp) {
1946 result = pnp_register_driver(&wbsd_pnp_driver);
1947 if (result < 0)
1948 return result;
1949 }
1950#endif /* CONFIG_PNP */
1951
1952 if (param_nopnp) {
1953 result = platform_driver_register(&wbsd_driver);
1954 if (result < 0)
1955 return result;
1956
1957 wbsd_device = platform_device_alloc(DRIVER_NAME, -1);
1958 if (!wbsd_device) {
1959 platform_driver_unregister(&wbsd_driver);
1960 return -ENOMEM;
1961 }
1962
1963 result = platform_device_add(wbsd_device);
1964 if (result) {
1965 platform_device_put(wbsd_device);
1966 platform_driver_unregister(&wbsd_driver);
1967 return result;
1968 }
1969 }
1970
1971 return 0;
1972}
1973
1974static void __exit wbsd_drv_exit(void)
1975{
1976#ifdef CONFIG_PNP
1977
1978 if (!param_nopnp)
1979 pnp_unregister_driver(&wbsd_pnp_driver);
1980
1981#endif /* CONFIG_PNP */
1982
1983 if (param_nopnp) {
1984 platform_device_unregister(wbsd_device);
1985
1986 platform_driver_unregister(&wbsd_driver);
1987 }
1988
1989 DBG("unloaded\n");
1990}
1991
1992module_init(wbsd_drv_init);
1993module_exit(wbsd_drv_exit);
1994#ifdef CONFIG_PNP
1995module_param_hw_named(nopnp, param_nopnp, uint, other, 0444);
1996#endif
1997module_param_hw_named(io, param_io, uint, ioport, 0444);
1998module_param_hw_named(irq, param_irq, uint, irq, 0444);
1999module_param_hw_named(dma, param_dma, int, dma, 0444);
2000
2001MODULE_LICENSE("GPL");
2002MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>");
2003MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver");
2004
2005#ifdef CONFIG_PNP
2006MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)");
2007#endif
2008MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)");
2009MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)");
2010MODULE_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#ifdef CONFIG_MMC_DEBUG
806 pr_warn("%s: Data command %d is not supported by this controller\n",
807 mmc_hostname(host->mmc), cmd->opcode);
808#endif
809 cmd->error = -EINVAL;
810
811 goto done;
812 }
813 }
814
815 /*
816 * Does the request include data?
817 */
818 if (cmd->data) {
819 wbsd_prepare_data(host, cmd->data);
820
821 if (cmd->data->error)
822 goto done;
823 }
824
825 wbsd_send_command(host, cmd);
826
827 /*
828 * If this is a data transfer the request
829 * will be finished after the data has
830 * transferred.
831 */
832 if (cmd->data && !cmd->error) {
833 /*
834 * Dirty fix for hardware bug.
835 */
836 if (host->dma == -1)
837 tasklet_schedule(&host->fifo_tasklet);
838
839 spin_unlock_bh(&host->lock);
840
841 return;
842 }
843
844done:
845 wbsd_request_end(host, mrq);
846
847 spin_unlock_bh(&host->lock);
848}
849
850static void wbsd_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
851{
852 struct wbsd_host *host = mmc_priv(mmc);
853 u8 clk, setup, pwr;
854
855 spin_lock_bh(&host->lock);
856
857 /*
858 * Reset the chip on each power off.
859 * Should clear out any weird states.
860 */
861 if (ios->power_mode == MMC_POWER_OFF)
862 wbsd_init_device(host);
863
864 if (ios->clock >= 24000000)
865 clk = WBSD_CLK_24M;
866 else if (ios->clock >= 16000000)
867 clk = WBSD_CLK_16M;
868 else if (ios->clock >= 12000000)
869 clk = WBSD_CLK_12M;
870 else
871 clk = WBSD_CLK_375K;
872
873 /*
874 * Only write to the clock register when
875 * there is an actual change.
876 */
877 if (clk != host->clk) {
878 wbsd_write_index(host, WBSD_IDX_CLK, clk);
879 host->clk = clk;
880 }
881
882 /*
883 * Power up card.
884 */
885 if (ios->power_mode != MMC_POWER_OFF) {
886 pwr = inb(host->base + WBSD_CSR);
887 pwr &= ~WBSD_POWER_N;
888 outb(pwr, host->base + WBSD_CSR);
889 }
890
891 /*
892 * MMC cards need to have pin 1 high during init.
893 * It wreaks havoc with the card detection though so
894 * that needs to be disabled.
895 */
896 setup = wbsd_read_index(host, WBSD_IDX_SETUP);
897 if (ios->chip_select == MMC_CS_HIGH) {
898 BUG_ON(ios->bus_width != MMC_BUS_WIDTH_1);
899 setup |= WBSD_DAT3_H;
900 host->flags |= WBSD_FIGNORE_DETECT;
901 } else {
902 if (setup & WBSD_DAT3_H) {
903 setup &= ~WBSD_DAT3_H;
904
905 /*
906 * We cannot resume card detection immediately
907 * because of capacitance and delays in the chip.
908 */
909 mod_timer(&host->ignore_timer, jiffies + HZ / 100);
910 }
911 }
912 wbsd_write_index(host, WBSD_IDX_SETUP, setup);
913
914 /*
915 * Store bus width for later. Will be used when
916 * setting up the data transfer.
917 */
918 host->bus_width = ios->bus_width;
919
920 spin_unlock_bh(&host->lock);
921}
922
923static int wbsd_get_ro(struct mmc_host *mmc)
924{
925 struct wbsd_host *host = mmc_priv(mmc);
926 u8 csr;
927
928 spin_lock_bh(&host->lock);
929
930 csr = inb(host->base + WBSD_CSR);
931 csr |= WBSD_MSLED;
932 outb(csr, host->base + WBSD_CSR);
933
934 mdelay(1);
935
936 csr = inb(host->base + WBSD_CSR);
937 csr &= ~WBSD_MSLED;
938 outb(csr, host->base + WBSD_CSR);
939
940 spin_unlock_bh(&host->lock);
941
942 return !!(csr & WBSD_WRPT);
943}
944
945static const struct mmc_host_ops wbsd_ops = {
946 .request = wbsd_request,
947 .set_ios = wbsd_set_ios,
948 .get_ro = wbsd_get_ro,
949};
950
951/*****************************************************************************\
952 * *
953 * Interrupt handling *
954 * *
955\*****************************************************************************/
956
957/*
958 * Helper function to reset detection ignore
959 */
960
961static void wbsd_reset_ignore(unsigned long data)
962{
963 struct wbsd_host *host = (struct wbsd_host *)data;
964
965 BUG_ON(host == NULL);
966
967 DBG("Resetting card detection ignore\n");
968
969 spin_lock_bh(&host->lock);
970
971 host->flags &= ~WBSD_FIGNORE_DETECT;
972
973 /*
974 * Card status might have changed during the
975 * blackout.
976 */
977 tasklet_schedule(&host->card_tasklet);
978
979 spin_unlock_bh(&host->lock);
980}
981
982/*
983 * Tasklets
984 */
985
986static inline struct mmc_data *wbsd_get_data(struct wbsd_host *host)
987{
988 WARN_ON(!host->mrq);
989 if (!host->mrq)
990 return NULL;
991
992 WARN_ON(!host->mrq->cmd);
993 if (!host->mrq->cmd)
994 return NULL;
995
996 WARN_ON(!host->mrq->cmd->data);
997 if (!host->mrq->cmd->data)
998 return NULL;
999
1000 return host->mrq->cmd->data;
1001}
1002
1003static void wbsd_tasklet_card(unsigned long param)
1004{
1005 struct wbsd_host *host = (struct wbsd_host *)param;
1006 u8 csr;
1007 int delay = -1;
1008
1009 spin_lock(&host->lock);
1010
1011 if (host->flags & WBSD_FIGNORE_DETECT) {
1012 spin_unlock(&host->lock);
1013 return;
1014 }
1015
1016 csr = inb(host->base + WBSD_CSR);
1017 WARN_ON(csr == 0xff);
1018
1019 if (csr & WBSD_CARDPRESENT) {
1020 if (!(host->flags & WBSD_FCARD_PRESENT)) {
1021 DBG("Card inserted\n");
1022 host->flags |= WBSD_FCARD_PRESENT;
1023
1024 delay = 500;
1025 }
1026 } else if (host->flags & WBSD_FCARD_PRESENT) {
1027 DBG("Card removed\n");
1028 host->flags &= ~WBSD_FCARD_PRESENT;
1029
1030 if (host->mrq) {
1031 pr_err("%s: Card removed during transfer!\n",
1032 mmc_hostname(host->mmc));
1033 wbsd_reset(host);
1034
1035 host->mrq->cmd->error = -ENOMEDIUM;
1036 tasklet_schedule(&host->finish_tasklet);
1037 }
1038
1039 delay = 0;
1040 }
1041
1042 /*
1043 * Unlock first since we might get a call back.
1044 */
1045
1046 spin_unlock(&host->lock);
1047
1048 if (delay != -1)
1049 mmc_detect_change(host->mmc, msecs_to_jiffies(delay));
1050}
1051
1052static void wbsd_tasklet_fifo(unsigned long param)
1053{
1054 struct wbsd_host *host = (struct wbsd_host *)param;
1055 struct mmc_data *data;
1056
1057 spin_lock(&host->lock);
1058
1059 if (!host->mrq)
1060 goto end;
1061
1062 data = wbsd_get_data(host);
1063 if (!data)
1064 goto end;
1065
1066 if (data->flags & MMC_DATA_WRITE)
1067 wbsd_fill_fifo(host);
1068 else
1069 wbsd_empty_fifo(host);
1070
1071 /*
1072 * Done?
1073 */
1074 if (host->num_sg == 0) {
1075 wbsd_write_index(host, WBSD_IDX_FIFOEN, 0);
1076 tasklet_schedule(&host->finish_tasklet);
1077 }
1078
1079end:
1080 spin_unlock(&host->lock);
1081}
1082
1083static void wbsd_tasklet_crc(unsigned long param)
1084{
1085 struct wbsd_host *host = (struct wbsd_host *)param;
1086 struct mmc_data *data;
1087
1088 spin_lock(&host->lock);
1089
1090 if (!host->mrq)
1091 goto end;
1092
1093 data = wbsd_get_data(host);
1094 if (!data)
1095 goto end;
1096
1097 DBGF("CRC error\n");
1098
1099 data->error = -EILSEQ;
1100
1101 tasklet_schedule(&host->finish_tasklet);
1102
1103end:
1104 spin_unlock(&host->lock);
1105}
1106
1107static void wbsd_tasklet_timeout(unsigned long param)
1108{
1109 struct wbsd_host *host = (struct wbsd_host *)param;
1110 struct mmc_data *data;
1111
1112 spin_lock(&host->lock);
1113
1114 if (!host->mrq)
1115 goto end;
1116
1117 data = wbsd_get_data(host);
1118 if (!data)
1119 goto end;
1120
1121 DBGF("Timeout\n");
1122
1123 data->error = -ETIMEDOUT;
1124
1125 tasklet_schedule(&host->finish_tasklet);
1126
1127end:
1128 spin_unlock(&host->lock);
1129}
1130
1131static void wbsd_tasklet_finish(unsigned long param)
1132{
1133 struct wbsd_host *host = (struct wbsd_host *)param;
1134 struct mmc_data *data;
1135
1136 spin_lock(&host->lock);
1137
1138 WARN_ON(!host->mrq);
1139 if (!host->mrq)
1140 goto end;
1141
1142 data = wbsd_get_data(host);
1143 if (!data)
1144 goto end;
1145
1146 wbsd_finish_data(host, data);
1147
1148end:
1149 spin_unlock(&host->lock);
1150}
1151
1152/*
1153 * Interrupt handling
1154 */
1155
1156static irqreturn_t wbsd_irq(int irq, void *dev_id)
1157{
1158 struct wbsd_host *host = dev_id;
1159 int isr;
1160
1161 isr = inb(host->base + WBSD_ISR);
1162
1163 /*
1164 * Was it actually our hardware that caused the interrupt?
1165 */
1166 if (isr == 0xff || isr == 0x00)
1167 return IRQ_NONE;
1168
1169 host->isr |= isr;
1170
1171 /*
1172 * Schedule tasklets as needed.
1173 */
1174 if (isr & WBSD_INT_CARD)
1175 tasklet_schedule(&host->card_tasklet);
1176 if (isr & WBSD_INT_FIFO_THRE)
1177 tasklet_schedule(&host->fifo_tasklet);
1178 if (isr & WBSD_INT_CRC)
1179 tasklet_hi_schedule(&host->crc_tasklet);
1180 if (isr & WBSD_INT_TIMEOUT)
1181 tasklet_hi_schedule(&host->timeout_tasklet);
1182 if (isr & WBSD_INT_TC)
1183 tasklet_schedule(&host->finish_tasklet);
1184
1185 return IRQ_HANDLED;
1186}
1187
1188/*****************************************************************************\
1189 * *
1190 * Device initialisation and shutdown *
1191 * *
1192\*****************************************************************************/
1193
1194/*
1195 * Allocate/free MMC structure.
1196 */
1197
1198static int wbsd_alloc_mmc(struct device *dev)
1199{
1200 struct mmc_host *mmc;
1201 struct wbsd_host *host;
1202
1203 /*
1204 * Allocate MMC structure.
1205 */
1206 mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev);
1207 if (!mmc)
1208 return -ENOMEM;
1209
1210 host = mmc_priv(mmc);
1211 host->mmc = mmc;
1212
1213 host->dma = -1;
1214
1215 /*
1216 * Set host parameters.
1217 */
1218 mmc->ops = &wbsd_ops;
1219 mmc->f_min = 375000;
1220 mmc->f_max = 24000000;
1221 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1222 mmc->caps = MMC_CAP_4_BIT_DATA;
1223
1224 spin_lock_init(&host->lock);
1225
1226 /*
1227 * Set up timers
1228 */
1229 init_timer(&host->ignore_timer);
1230 host->ignore_timer.data = (unsigned long)host;
1231 host->ignore_timer.function = wbsd_reset_ignore;
1232
1233 /*
1234 * Maximum number of segments. Worst case is one sector per segment
1235 * so this will be 64kB/512.
1236 */
1237 mmc->max_segs = 128;
1238
1239 /*
1240 * Maximum request size. Also limited by 64KiB buffer.
1241 */
1242 mmc->max_req_size = 65536;
1243
1244 /*
1245 * Maximum segment size. Could be one segment with the maximum number
1246 * of bytes.
1247 */
1248 mmc->max_seg_size = mmc->max_req_size;
1249
1250 /*
1251 * Maximum block size. We have 12 bits (= 4095) but have to subtract
1252 * space for CRC. So the maximum is 4095 - 4*2 = 4087.
1253 */
1254 mmc->max_blk_size = 4087;
1255
1256 /*
1257 * Maximum block count. There is no real limit so the maximum
1258 * request size will be the only restriction.
1259 */
1260 mmc->max_blk_count = mmc->max_req_size;
1261
1262 dev_set_drvdata(dev, mmc);
1263
1264 return 0;
1265}
1266
1267static void wbsd_free_mmc(struct device *dev)
1268{
1269 struct mmc_host *mmc;
1270 struct wbsd_host *host;
1271
1272 mmc = dev_get_drvdata(dev);
1273 if (!mmc)
1274 return;
1275
1276 host = mmc_priv(mmc);
1277 BUG_ON(host == NULL);
1278
1279 del_timer_sync(&host->ignore_timer);
1280
1281 mmc_free_host(mmc);
1282
1283 dev_set_drvdata(dev, NULL);
1284}
1285
1286/*
1287 * Scan for known chip id:s
1288 */
1289
1290static int wbsd_scan(struct wbsd_host *host)
1291{
1292 int i, j, k;
1293 int id;
1294
1295 /*
1296 * Iterate through all ports, all codes to
1297 * find hardware that is in our known list.
1298 */
1299 for (i = 0; i < ARRAY_SIZE(config_ports); i++) {
1300 if (!request_region(config_ports[i], 2, DRIVER_NAME))
1301 continue;
1302
1303 for (j = 0; j < ARRAY_SIZE(unlock_codes); j++) {
1304 id = 0xFFFF;
1305
1306 host->config = config_ports[i];
1307 host->unlock_code = unlock_codes[j];
1308
1309 wbsd_unlock_config(host);
1310
1311 outb(WBSD_CONF_ID_HI, config_ports[i]);
1312 id = inb(config_ports[i] + 1) << 8;
1313
1314 outb(WBSD_CONF_ID_LO, config_ports[i]);
1315 id |= inb(config_ports[i] + 1);
1316
1317 wbsd_lock_config(host);
1318
1319 for (k = 0; k < ARRAY_SIZE(valid_ids); k++) {
1320 if (id == valid_ids[k]) {
1321 host->chip_id = id;
1322
1323 return 0;
1324 }
1325 }
1326
1327 if (id != 0xFFFF) {
1328 DBG("Unknown hardware (id %x) found at %x\n",
1329 id, config_ports[i]);
1330 }
1331 }
1332
1333 release_region(config_ports[i], 2);
1334 }
1335
1336 host->config = 0;
1337 host->unlock_code = 0;
1338
1339 return -ENODEV;
1340}
1341
1342/*
1343 * Allocate/free io port ranges
1344 */
1345
1346static int wbsd_request_region(struct wbsd_host *host, int base)
1347{
1348 if (base & 0x7)
1349 return -EINVAL;
1350
1351 if (!request_region(base, 8, DRIVER_NAME))
1352 return -EIO;
1353
1354 host->base = base;
1355
1356 return 0;
1357}
1358
1359static void wbsd_release_regions(struct wbsd_host *host)
1360{
1361 if (host->base)
1362 release_region(host->base, 8);
1363
1364 host->base = 0;
1365
1366 if (host->config)
1367 release_region(host->config, 2);
1368
1369 host->config = 0;
1370}
1371
1372/*
1373 * Allocate/free DMA port and buffer
1374 */
1375
1376static void wbsd_request_dma(struct wbsd_host *host, int dma)
1377{
1378 if (dma < 0)
1379 return;
1380
1381 if (request_dma(dma, DRIVER_NAME))
1382 goto err;
1383
1384 /*
1385 * We need to allocate a special buffer in
1386 * order for ISA to be able to DMA to it.
1387 */
1388 host->dma_buffer = kmalloc(WBSD_DMA_SIZE,
1389 GFP_NOIO | GFP_DMA | __GFP_REPEAT | __GFP_NOWARN);
1390 if (!host->dma_buffer)
1391 goto free;
1392
1393 /*
1394 * Translate the address to a physical address.
1395 */
1396 host->dma_addr = dma_map_single(mmc_dev(host->mmc), host->dma_buffer,
1397 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1398 if (dma_mapping_error(mmc_dev(host->mmc), host->dma_addr))
1399 goto kfree;
1400
1401 /*
1402 * ISA DMA must be aligned on a 64k basis.
1403 */
1404 if ((host->dma_addr & 0xffff) != 0)
1405 goto unmap;
1406 /*
1407 * ISA cannot access memory above 16 MB.
1408 */
1409 else if (host->dma_addr >= 0x1000000)
1410 goto unmap;
1411
1412 host->dma = dma;
1413
1414 return;
1415
1416unmap:
1417 /*
1418 * If we've gotten here then there is some kind of alignment bug
1419 */
1420 BUG_ON(1);
1421
1422 dma_unmap_single(mmc_dev(host->mmc), host->dma_addr,
1423 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1424 host->dma_addr = 0;
1425
1426kfree:
1427 kfree(host->dma_buffer);
1428 host->dma_buffer = NULL;
1429
1430free:
1431 free_dma(dma);
1432
1433err:
1434 pr_warn(DRIVER_NAME ": Unable to allocate DMA %d - falling back on FIFO\n",
1435 dma);
1436}
1437
1438static void wbsd_release_dma(struct wbsd_host *host)
1439{
1440 if (!dma_mapping_error(mmc_dev(host->mmc), host->dma_addr)) {
1441 dma_unmap_single(mmc_dev(host->mmc), host->dma_addr,
1442 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1443 }
1444 kfree(host->dma_buffer);
1445 if (host->dma >= 0)
1446 free_dma(host->dma);
1447
1448 host->dma = -1;
1449 host->dma_buffer = NULL;
1450 host->dma_addr = 0;
1451}
1452
1453/*
1454 * Allocate/free IRQ.
1455 */
1456
1457static int wbsd_request_irq(struct wbsd_host *host, int irq)
1458{
1459 int ret;
1460
1461 /*
1462 * Set up tasklets. Must be done before requesting interrupt.
1463 */
1464 tasklet_init(&host->card_tasklet, wbsd_tasklet_card,
1465 (unsigned long)host);
1466 tasklet_init(&host->fifo_tasklet, wbsd_tasklet_fifo,
1467 (unsigned long)host);
1468 tasklet_init(&host->crc_tasklet, wbsd_tasklet_crc,
1469 (unsigned long)host);
1470 tasklet_init(&host->timeout_tasklet, wbsd_tasklet_timeout,
1471 (unsigned long)host);
1472 tasklet_init(&host->finish_tasklet, wbsd_tasklet_finish,
1473 (unsigned long)host);
1474
1475 /*
1476 * Allocate interrupt.
1477 */
1478 ret = request_irq(irq, wbsd_irq, IRQF_SHARED, DRIVER_NAME, host);
1479 if (ret)
1480 return ret;
1481
1482 host->irq = irq;
1483
1484 return 0;
1485}
1486
1487static void wbsd_release_irq(struct wbsd_host *host)
1488{
1489 if (!host->irq)
1490 return;
1491
1492 free_irq(host->irq, host);
1493
1494 host->irq = 0;
1495
1496 tasklet_kill(&host->card_tasklet);
1497 tasklet_kill(&host->fifo_tasklet);
1498 tasklet_kill(&host->crc_tasklet);
1499 tasklet_kill(&host->timeout_tasklet);
1500 tasklet_kill(&host->finish_tasklet);
1501}
1502
1503/*
1504 * Allocate all resources for the host.
1505 */
1506
1507static int wbsd_request_resources(struct wbsd_host *host,
1508 int base, int irq, int dma)
1509{
1510 int ret;
1511
1512 /*
1513 * Allocate I/O ports.
1514 */
1515 ret = wbsd_request_region(host, base);
1516 if (ret)
1517 return ret;
1518
1519 /*
1520 * Allocate interrupt.
1521 */
1522 ret = wbsd_request_irq(host, irq);
1523 if (ret)
1524 return ret;
1525
1526 /*
1527 * Allocate DMA.
1528 */
1529 wbsd_request_dma(host, dma);
1530
1531 return 0;
1532}
1533
1534/*
1535 * Release all resources for the host.
1536 */
1537
1538static void wbsd_release_resources(struct wbsd_host *host)
1539{
1540 wbsd_release_dma(host);
1541 wbsd_release_irq(host);
1542 wbsd_release_regions(host);
1543}
1544
1545/*
1546 * Configure the resources the chip should use.
1547 */
1548
1549static void wbsd_chip_config(struct wbsd_host *host)
1550{
1551 wbsd_unlock_config(host);
1552
1553 /*
1554 * Reset the chip.
1555 */
1556 wbsd_write_config(host, WBSD_CONF_SWRST, 1);
1557 wbsd_write_config(host, WBSD_CONF_SWRST, 0);
1558
1559 /*
1560 * Select SD/MMC function.
1561 */
1562 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1563
1564 /*
1565 * Set up card detection.
1566 */
1567 wbsd_write_config(host, WBSD_CONF_PINS, WBSD_PINS_DETECT_GP11);
1568
1569 /*
1570 * Configure chip
1571 */
1572 wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8);
1573 wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff);
1574
1575 wbsd_write_config(host, WBSD_CONF_IRQ, host->irq);
1576
1577 if (host->dma >= 0)
1578 wbsd_write_config(host, WBSD_CONF_DRQ, host->dma);
1579
1580 /*
1581 * Enable and power up chip.
1582 */
1583 wbsd_write_config(host, WBSD_CONF_ENABLE, 1);
1584 wbsd_write_config(host, WBSD_CONF_POWER, 0x20);
1585
1586 wbsd_lock_config(host);
1587}
1588
1589/*
1590 * Check that configured resources are correct.
1591 */
1592
1593static int wbsd_chip_validate(struct wbsd_host *host)
1594{
1595 int base, irq, dma;
1596
1597 wbsd_unlock_config(host);
1598
1599 /*
1600 * Select SD/MMC function.
1601 */
1602 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1603
1604 /*
1605 * Read configuration.
1606 */
1607 base = wbsd_read_config(host, WBSD_CONF_PORT_HI) << 8;
1608 base |= wbsd_read_config(host, WBSD_CONF_PORT_LO);
1609
1610 irq = wbsd_read_config(host, WBSD_CONF_IRQ);
1611
1612 dma = wbsd_read_config(host, WBSD_CONF_DRQ);
1613
1614 wbsd_lock_config(host);
1615
1616 /*
1617 * Validate against given configuration.
1618 */
1619 if (base != host->base)
1620 return 0;
1621 if (irq != host->irq)
1622 return 0;
1623 if ((dma != host->dma) && (host->dma != -1))
1624 return 0;
1625
1626 return 1;
1627}
1628
1629/*
1630 * Powers down the SD function
1631 */
1632
1633static void wbsd_chip_poweroff(struct wbsd_host *host)
1634{
1635 wbsd_unlock_config(host);
1636
1637 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1638 wbsd_write_config(host, WBSD_CONF_ENABLE, 0);
1639
1640 wbsd_lock_config(host);
1641}
1642
1643/*****************************************************************************\
1644 * *
1645 * Devices setup and shutdown *
1646 * *
1647\*****************************************************************************/
1648
1649static int wbsd_init(struct device *dev, int base, int irq, int dma,
1650 int pnp)
1651{
1652 struct wbsd_host *host = NULL;
1653 struct mmc_host *mmc = NULL;
1654 int ret;
1655
1656 ret = wbsd_alloc_mmc(dev);
1657 if (ret)
1658 return ret;
1659
1660 mmc = dev_get_drvdata(dev);
1661 host = mmc_priv(mmc);
1662
1663 /*
1664 * Scan for hardware.
1665 */
1666 ret = wbsd_scan(host);
1667 if (ret) {
1668 if (pnp && (ret == -ENODEV)) {
1669 pr_warn(DRIVER_NAME ": Unable to confirm device presence - you may experience lock-ups\n");
1670 } else {
1671 wbsd_free_mmc(dev);
1672 return ret;
1673 }
1674 }
1675
1676 /*
1677 * Request resources.
1678 */
1679 ret = wbsd_request_resources(host, base, irq, dma);
1680 if (ret) {
1681 wbsd_release_resources(host);
1682 wbsd_free_mmc(dev);
1683 return ret;
1684 }
1685
1686 /*
1687 * See if chip needs to be configured.
1688 */
1689 if (pnp) {
1690 if ((host->config != 0) && !wbsd_chip_validate(host)) {
1691 pr_warn(DRIVER_NAME ": PnP active but chip not configured! You probably have a buggy BIOS. Configuring chip manually.\n");
1692 wbsd_chip_config(host);
1693 }
1694 } else
1695 wbsd_chip_config(host);
1696
1697 /*
1698 * Power Management stuff. No idea how this works.
1699 * Not tested.
1700 */
1701#ifdef CONFIG_PM
1702 if (host->config) {
1703 wbsd_unlock_config(host);
1704 wbsd_write_config(host, WBSD_CONF_PME, 0xA0);
1705 wbsd_lock_config(host);
1706 }
1707#endif
1708 /*
1709 * Allow device to initialise itself properly.
1710 */
1711 mdelay(5);
1712
1713 /*
1714 * Reset the chip into a known state.
1715 */
1716 wbsd_init_device(host);
1717
1718 mmc_add_host(mmc);
1719
1720 pr_info("%s: W83L51xD", mmc_hostname(mmc));
1721 if (host->chip_id != 0)
1722 printk(" id %x", (int)host->chip_id);
1723 printk(" at 0x%x irq %d", (int)host->base, (int)host->irq);
1724 if (host->dma >= 0)
1725 printk(" dma %d", (int)host->dma);
1726 else
1727 printk(" FIFO");
1728 if (pnp)
1729 printk(" PnP");
1730 printk("\n");
1731
1732 return 0;
1733}
1734
1735static void wbsd_shutdown(struct device *dev, int pnp)
1736{
1737 struct mmc_host *mmc = dev_get_drvdata(dev);
1738 struct wbsd_host *host;
1739
1740 if (!mmc)
1741 return;
1742
1743 host = mmc_priv(mmc);
1744
1745 mmc_remove_host(mmc);
1746
1747 /*
1748 * Power down the SD/MMC function.
1749 */
1750 if (!pnp)
1751 wbsd_chip_poweroff(host);
1752
1753 wbsd_release_resources(host);
1754
1755 wbsd_free_mmc(dev);
1756}
1757
1758/*
1759 * Non-PnP
1760 */
1761
1762static int wbsd_probe(struct platform_device *dev)
1763{
1764 /* Use the module parameters for resources */
1765 return wbsd_init(&dev->dev, param_io, param_irq, param_dma, 0);
1766}
1767
1768static int wbsd_remove(struct platform_device *dev)
1769{
1770 wbsd_shutdown(&dev->dev, 0);
1771
1772 return 0;
1773}
1774
1775/*
1776 * PnP
1777 */
1778
1779#ifdef CONFIG_PNP
1780
1781static int
1782wbsd_pnp_probe(struct pnp_dev *pnpdev, const struct pnp_device_id *dev_id)
1783{
1784 int io, irq, dma;
1785
1786 /*
1787 * Get resources from PnP layer.
1788 */
1789 io = pnp_port_start(pnpdev, 0);
1790 irq = pnp_irq(pnpdev, 0);
1791 if (pnp_dma_valid(pnpdev, 0))
1792 dma = pnp_dma(pnpdev, 0);
1793 else
1794 dma = -1;
1795
1796 DBGF("PnP resources: port %3x irq %d dma %d\n", io, irq, dma);
1797
1798 return wbsd_init(&pnpdev->dev, io, irq, dma, 1);
1799}
1800
1801static void wbsd_pnp_remove(struct pnp_dev *dev)
1802{
1803 wbsd_shutdown(&dev->dev, 1);
1804}
1805
1806#endif /* CONFIG_PNP */
1807
1808/*
1809 * Power management
1810 */
1811
1812#ifdef CONFIG_PM
1813
1814static int wbsd_platform_suspend(struct platform_device *dev,
1815 pm_message_t state)
1816{
1817 struct mmc_host *mmc = platform_get_drvdata(dev);
1818 struct wbsd_host *host;
1819
1820 if (mmc == NULL)
1821 return 0;
1822
1823 DBGF("Suspending...\n");
1824
1825 host = mmc_priv(mmc);
1826
1827 wbsd_chip_poweroff(host);
1828 return 0;
1829}
1830
1831static int wbsd_platform_resume(struct platform_device *dev)
1832{
1833 struct mmc_host *mmc = platform_get_drvdata(dev);
1834 struct wbsd_host *host;
1835
1836 if (mmc == NULL)
1837 return 0;
1838
1839 DBGF("Resuming...\n");
1840
1841 host = mmc_priv(mmc);
1842
1843 wbsd_chip_config(host);
1844
1845 /*
1846 * Allow device to initialise itself properly.
1847 */
1848 mdelay(5);
1849
1850 wbsd_init_device(host);
1851 return 0;
1852}
1853
1854#ifdef CONFIG_PNP
1855
1856static int wbsd_pnp_suspend(struct pnp_dev *pnp_dev, pm_message_t state)
1857{
1858 struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
1859
1860 if (mmc == NULL)
1861 return 0;
1862
1863 DBGF("Suspending...\n");
1864 return 0;
1865}
1866
1867static int wbsd_pnp_resume(struct pnp_dev *pnp_dev)
1868{
1869 struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
1870 struct wbsd_host *host;
1871
1872 if (mmc == NULL)
1873 return 0;
1874
1875 DBGF("Resuming...\n");
1876
1877 host = mmc_priv(mmc);
1878
1879 /*
1880 * See if chip needs to be configured.
1881 */
1882 if (host->config != 0) {
1883 if (!wbsd_chip_validate(host)) {
1884 pr_warn(DRIVER_NAME ": PnP active but chip not configured! You probably have a buggy BIOS. Configuring chip manually.\n");
1885 wbsd_chip_config(host);
1886 }
1887 }
1888
1889 /*
1890 * Allow device to initialise itself properly.
1891 */
1892 mdelay(5);
1893
1894 wbsd_init_device(host);
1895 return 0;
1896}
1897
1898#endif /* CONFIG_PNP */
1899
1900#else /* CONFIG_PM */
1901
1902#define wbsd_platform_suspend NULL
1903#define wbsd_platform_resume NULL
1904
1905#define wbsd_pnp_suspend NULL
1906#define wbsd_pnp_resume NULL
1907
1908#endif /* CONFIG_PM */
1909
1910static struct platform_device *wbsd_device;
1911
1912static struct platform_driver wbsd_driver = {
1913 .probe = wbsd_probe,
1914 .remove = wbsd_remove,
1915
1916 .suspend = wbsd_platform_suspend,
1917 .resume = wbsd_platform_resume,
1918 .driver = {
1919 .name = DRIVER_NAME,
1920 },
1921};
1922
1923#ifdef CONFIG_PNP
1924
1925static struct pnp_driver wbsd_pnp_driver = {
1926 .name = DRIVER_NAME,
1927 .id_table = pnp_dev_table,
1928 .probe = wbsd_pnp_probe,
1929 .remove = wbsd_pnp_remove,
1930
1931 .suspend = wbsd_pnp_suspend,
1932 .resume = wbsd_pnp_resume,
1933};
1934
1935#endif /* CONFIG_PNP */
1936
1937/*
1938 * Module loading/unloading
1939 */
1940
1941static int __init wbsd_drv_init(void)
1942{
1943 int result;
1944
1945 pr_info(DRIVER_NAME
1946 ": Winbond W83L51xD SD/MMC card interface driver\n");
1947 pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1948
1949#ifdef CONFIG_PNP
1950
1951 if (!param_nopnp) {
1952 result = pnp_register_driver(&wbsd_pnp_driver);
1953 if (result < 0)
1954 return result;
1955 }
1956#endif /* CONFIG_PNP */
1957
1958 if (param_nopnp) {
1959 result = platform_driver_register(&wbsd_driver);
1960 if (result < 0)
1961 return result;
1962
1963 wbsd_device = platform_device_alloc(DRIVER_NAME, -1);
1964 if (!wbsd_device) {
1965 platform_driver_unregister(&wbsd_driver);
1966 return -ENOMEM;
1967 }
1968
1969 result = platform_device_add(wbsd_device);
1970 if (result) {
1971 platform_device_put(wbsd_device);
1972 platform_driver_unregister(&wbsd_driver);
1973 return result;
1974 }
1975 }
1976
1977 return 0;
1978}
1979
1980static void __exit wbsd_drv_exit(void)
1981{
1982#ifdef CONFIG_PNP
1983
1984 if (!param_nopnp)
1985 pnp_unregister_driver(&wbsd_pnp_driver);
1986
1987#endif /* CONFIG_PNP */
1988
1989 if (param_nopnp) {
1990 platform_device_unregister(wbsd_device);
1991
1992 platform_driver_unregister(&wbsd_driver);
1993 }
1994
1995 DBG("unloaded\n");
1996}
1997
1998module_init(wbsd_drv_init);
1999module_exit(wbsd_drv_exit);
2000#ifdef CONFIG_PNP
2001module_param_named(nopnp, param_nopnp, uint, 0444);
2002#endif
2003module_param_named(io, param_io, uint, 0444);
2004module_param_named(irq, param_irq, uint, 0444);
2005module_param_named(dma, param_dma, int, 0444);
2006
2007MODULE_LICENSE("GPL");
2008MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>");
2009MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver");
2010
2011#ifdef CONFIG_PNP
2012MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)");
2013#endif
2014MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)");
2015MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)");
2016MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)");