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