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(value: host->unlock_code, port: host->config);
89 outb(value: host->unlock_code, port: 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, port: 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(value: reg, port: host->config);
104 outb(value, port: 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(value: reg, port: host->config);
112 return inb(port: host->config + 1);
113}
114
115static inline void wbsd_write_index(struct wbsd_host *host, u8 index, u8 value)
116{
117 outb(value: index, port: host->base + WBSD_IDXR);
118 outb(value, port: host->base + WBSD_DATAR);
119}
120
121static inline u8 wbsd_read_index(struct wbsd_host *host, u8 index)
122{
123 outb(value: index, port: host->base + WBSD_IDXR);
124 return inb(port: 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, value: setup);
141
142 /*
143 * Set DAT3 to input
144 */
145 setup &= ~WBSD_DAT3_H;
146 wbsd_write_index(host, WBSD_IDX_SETUP, value: 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, port: host->base + WBSD_CSR);
158
159 /*
160 * Set maximum timeout.
161 */
162 wbsd_write_index(host, WBSD_IDX_TAAC, value: 0x7F);
163
164 /*
165 * Test for card presence
166 */
167 if (inb(port: 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(value: ier, port: host->base + WBSD_EIR);
183
184 /*
185 * Clear interrupts.
186 */
187 inb(port: 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, value: 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(dmanr: host->dma);
214 clear_dma_ff(dmanr: host->dma);
215 release_dma_lock(flags: dmaflags);
216
217 /*
218 * Disable DMA on host.
219 */
220 wbsd_write_index(host, WBSD_IDX_DMA, value: 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(lock: &host->lock);
229 mmc_request_done(host->mmc, mrq);
230 spin_lock(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(page: sg_page(sg: 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(sgl: data->sg, nents: data->sg_len, buf: host->dma_buffer, buflen: 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(sgl: data->sg, nents: data->sg_len, buf: host->dma_buffer, buflen: 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(value: cmd->opcode, port: host->base + WBSD_CMDR);
356 for (i = 3; i >= 0; i--)
357 outb(value: (cmd->arg >> (i * 8)) & 0xff, port: 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(port: 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(port: 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(t: &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(port: 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(value: buffer[idx], port: 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(t: &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, value: 127);
548 else {
549 wbsd_write_index(host, WBSD_IDX_TAAC,
550 value: data->timeout_ns / 1000000);
551 }
552
553 if (data->timeout_clks > 255)
554 wbsd_write_index(host, WBSD_IDX_NSAC, value: 255);
555 else
556 wbsd_write_index(host, WBSD_IDX_NSAC, value: 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, value: (blksize >> 4) & 0xF0);
570 wbsd_write_index(host, WBSD_IDX_PBSLSB, value: 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 value: ((blksize >> 4) & 0xF0) | WBSD_DATA_WIDTH);
576 wbsd_write_index(host, WBSD_IDX_PBSLSB, value: 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, value: 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(dmanr: host->dma);
616 clear_dma_ff(dmanr: host->dma);
617 if (data->flags & MMC_DATA_READ)
618 set_dma_mode(dmanr: host->dma, DMA_MODE_READ & ~0x40);
619 else
620 set_dma_mode(dmanr: host->dma, DMA_MODE_WRITE & ~0x40);
621 set_dma_addr(dmanr: host->dma, a: host->dma_addr);
622 set_dma_count(dmanr: host->dma, count: size);
623
624 enable_dma(dmanr: host->dma);
625 release_dma_lock(flags: 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, value: 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, cmd: 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, value: 0);
695
696 /*
697 * Turn of ISA DMA controller.
698 */
699 dmaflags = claim_dma_lock();
700 disable_dma(dmanr: host->dma);
701 clear_dma_ff(dmanr: host->dma);
702 count = get_dma_residue(dmanr: host->dma);
703 release_dma_lock(flags: 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, mrq: 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(host: mmc);
746 struct mmc_command *cmd;
747
748 /*
749 * Disable tasklets to avoid a deadlock.
750 */
751 spin_lock_bh(lock: &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, data: 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(t: &host->fifo_tasklet);
825
826 spin_unlock_bh(lock: &host->lock);
827
828 return;
829 }
830
831done:
832 wbsd_request_end(host, mrq);
833
834 spin_unlock_bh(lock: &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(host: mmc);
840 u8 clk, setup, pwr;
841
842 spin_lock_bh(lock: &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, value: clk);
866 host->clk = clk;
867 }
868
869 /*
870 * Power up card.
871 */
872 if (ios->power_mode != MMC_POWER_OFF) {
873 pwr = inb(port: host->base + WBSD_CSR);
874 pwr &= ~WBSD_POWER_N;
875 outb(value: pwr, port: 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(timer: &host->ignore_timer, expires: jiffies + HZ / 100);
897 }
898 }
899 wbsd_write_index(host, WBSD_IDX_SETUP, value: 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(lock: &host->lock);
908}
909
910static int wbsd_get_ro(struct mmc_host *mmc)
911{
912 struct wbsd_host *host = mmc_priv(host: mmc);
913 u8 csr;
914
915 spin_lock_bh(lock: &host->lock);
916
917 csr = inb(port: host->base + WBSD_CSR);
918 csr |= WBSD_MSLED;
919 outb(value: csr, port: host->base + WBSD_CSR);
920
921 mdelay(1);
922
923 csr = inb(port: host->base + WBSD_CSR);
924 csr &= ~WBSD_MSLED;
925 outb(value: csr, port: host->base + WBSD_CSR);
926
927 spin_unlock_bh(lock: &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(lock: &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(t: &host->card_tasklet);
965
966 spin_unlock_bh(lock: &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(lock: &host->lock);
997
998 if (host->flags & WBSD_FIGNORE_DETECT) {
999 spin_unlock(lock: &host->lock);
1000 return;
1001 }
1002
1003 csr = inb(port: 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(t: &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(lock: &host->lock);
1034
1035 if (delay != -1)
1036 mmc_detect_change(host->mmc, delay: msecs_to_jiffies(m: 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(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, value: 0);
1063 tasklet_schedule(t: &host->finish_tasklet);
1064 }
1065
1066end:
1067 spin_unlock(lock: &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(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(t: &host->finish_tasklet);
1089
1090end:
1091 spin_unlock(lock: &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(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(t: &host->finish_tasklet);
1113
1114end:
1115 spin_unlock(lock: &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(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(lock: &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(port: 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(t: &host->card_tasklet);
1163 if (isr & WBSD_INT_FIFO_THRE)
1164 tasklet_schedule(t: &host->fifo_tasklet);
1165 if (isr & WBSD_INT_CRC)
1166 tasklet_hi_schedule(t: &host->crc_tasklet);
1167 if (isr & WBSD_INT_TIMEOUT)
1168 tasklet_hi_schedule(t: &host->timeout_tasklet);
1169 if (isr & WBSD_INT_TC)
1170 tasklet_schedule(t: &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(extra: sizeof(struct wbsd_host), dev);
1194 if (!mmc)
1195 return -ENOMEM;
1196
1197 host = mmc_priv(host: 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, data: 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(host: mmc);
1262 BUG_ON(host == NULL);
1263
1264 del_timer_sync(timer: &host->ignore_timer);
1265
1266 mmc_free_host(mmc);
1267}
1268
1269/*
1270 * Scan for known chip id:s
1271 */
1272
1273static int wbsd_scan(struct wbsd_host *host)
1274{
1275 int i, j, k;
1276 int id;
1277
1278 /*
1279 * Iterate through all ports, all codes to
1280 * find hardware that is in our known list.
1281 */
1282 for (i = 0; i < ARRAY_SIZE(config_ports); i++) {
1283 if (!request_region(config_ports[i], 2, DRIVER_NAME))
1284 continue;
1285
1286 for (j = 0; j < ARRAY_SIZE(unlock_codes); j++) {
1287 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, port: config_ports[i]);
1295 id = inb(port: config_ports[i] + 1) << 8;
1296
1297 outb(WBSD_CONF_ID_LO, port: config_ports[i]);
1298 id |= inb(port: 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(dmanr: 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), dma_addr: 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(objp: host->dma_buffer);
1411 host->dma_buffer = NULL;
1412
1413free:
1414 free_dma(dmanr: 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(objp: host->dma_buffer);
1430 }
1431 if (host->dma >= 0)
1432 free_dma(dmanr: 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_setup(t: &host->card_tasklet, callback: wbsd_tasklet_card);
1451 tasklet_setup(t: &host->fifo_tasklet, callback: wbsd_tasklet_fifo);
1452 tasklet_setup(t: &host->crc_tasklet, callback: wbsd_tasklet_crc);
1453 tasklet_setup(t: &host->timeout_tasklet, callback: wbsd_tasklet_timeout);
1454 tasklet_setup(t: &host->finish_tasklet, callback: wbsd_tasklet_finish);
1455
1456 /*
1457 * Allocate interrupt.
1458 */
1459 ret = request_irq(irq, handler: wbsd_irq, IRQF_SHARED, DRIVER_NAME, dev: host);
1460 if (ret)
1461 return ret;
1462
1463 host->irq = irq;
1464
1465 return 0;
1466}
1467
1468static void wbsd_release_irq(struct wbsd_host *host)
1469{
1470 if (!host->irq)
1471 return;
1472
1473 free_irq(host->irq, host);
1474
1475 host->irq = 0;
1476
1477 tasklet_kill(t: &host->card_tasklet);
1478 tasklet_kill(t: &host->fifo_tasklet);
1479 tasklet_kill(t: &host->crc_tasklet);
1480 tasklet_kill(t: &host->timeout_tasklet);
1481 tasklet_kill(t: &host->finish_tasklet);
1482}
1483
1484/*
1485 * Allocate all resources for the host.
1486 */
1487
1488static int wbsd_request_resources(struct wbsd_host *host,
1489 int base, int irq, int dma)
1490{
1491 int ret;
1492
1493 /*
1494 * Allocate I/O ports.
1495 */
1496 ret = wbsd_request_region(host, base);
1497 if (ret)
1498 return ret;
1499
1500 /*
1501 * Allocate interrupt.
1502 */
1503 ret = wbsd_request_irq(host, irq);
1504 if (ret)
1505 return ret;
1506
1507 /*
1508 * Allocate DMA.
1509 */
1510 wbsd_request_dma(host, dma);
1511
1512 return 0;
1513}
1514
1515/*
1516 * Release all resources for the host.
1517 */
1518
1519static void wbsd_release_resources(struct wbsd_host *host)
1520{
1521 wbsd_release_dma(host);
1522 wbsd_release_irq(host);
1523 wbsd_release_regions(host);
1524}
1525
1526/*
1527 * Configure the resources the chip should use.
1528 */
1529
1530static void wbsd_chip_config(struct wbsd_host *host)
1531{
1532 wbsd_unlock_config(host);
1533
1534 /*
1535 * Reset the chip.
1536 */
1537 wbsd_write_config(host, WBSD_CONF_SWRST, value: 1);
1538 wbsd_write_config(host, WBSD_CONF_SWRST, value: 0);
1539
1540 /*
1541 * Select SD/MMC function.
1542 */
1543 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1544
1545 /*
1546 * Set up card detection.
1547 */
1548 wbsd_write_config(host, WBSD_CONF_PINS, WBSD_PINS_DETECT_GP11);
1549
1550 /*
1551 * Configure chip
1552 */
1553 wbsd_write_config(host, WBSD_CONF_PORT_HI, value: host->base >> 8);
1554 wbsd_write_config(host, WBSD_CONF_PORT_LO, value: host->base & 0xff);
1555
1556 wbsd_write_config(host, WBSD_CONF_IRQ, value: host->irq);
1557
1558 if (host->dma >= 0)
1559 wbsd_write_config(host, WBSD_CONF_DRQ, value: host->dma);
1560
1561 /*
1562 * Enable and power up chip.
1563 */
1564 wbsd_write_config(host, WBSD_CONF_ENABLE, value: 1);
1565 wbsd_write_config(host, WBSD_CONF_POWER, value: 0x20);
1566
1567 wbsd_lock_config(host);
1568}
1569
1570/*
1571 * Check that configured resources are correct.
1572 */
1573
1574static int wbsd_chip_validate(struct wbsd_host *host)
1575{
1576 int base, irq, dma;
1577
1578 wbsd_unlock_config(host);
1579
1580 /*
1581 * Select SD/MMC function.
1582 */
1583 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1584
1585 /*
1586 * Read configuration.
1587 */
1588 base = wbsd_read_config(host, WBSD_CONF_PORT_HI) << 8;
1589 base |= wbsd_read_config(host, WBSD_CONF_PORT_LO);
1590
1591 irq = wbsd_read_config(host, WBSD_CONF_IRQ);
1592
1593 dma = wbsd_read_config(host, WBSD_CONF_DRQ);
1594
1595 wbsd_lock_config(host);
1596
1597 /*
1598 * Validate against given configuration.
1599 */
1600 if (base != host->base)
1601 return 0;
1602 if (irq != host->irq)
1603 return 0;
1604 if ((dma != host->dma) && (host->dma != -1))
1605 return 0;
1606
1607 return 1;
1608}
1609
1610/*
1611 * Powers down the SD function
1612 */
1613
1614static void wbsd_chip_poweroff(struct wbsd_host *host)
1615{
1616 wbsd_unlock_config(host);
1617
1618 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1619 wbsd_write_config(host, WBSD_CONF_ENABLE, value: 0);
1620
1621 wbsd_lock_config(host);
1622}
1623
1624/*****************************************************************************\
1625 * *
1626 * Devices setup and shutdown *
1627 * *
1628\*****************************************************************************/
1629
1630static int wbsd_init(struct device *dev, int base, int irq, int dma,
1631 int pnp)
1632{
1633 struct wbsd_host *host = NULL;
1634 struct mmc_host *mmc = NULL;
1635 int ret;
1636
1637 ret = wbsd_alloc_mmc(dev);
1638 if (ret)
1639 return ret;
1640
1641 mmc = dev_get_drvdata(dev);
1642 host = mmc_priv(host: mmc);
1643
1644 /*
1645 * Scan for hardware.
1646 */
1647 ret = wbsd_scan(host);
1648 if (ret) {
1649 if (pnp && (ret == -ENODEV)) {
1650 pr_warn(DRIVER_NAME ": Unable to confirm device presence - you may experience lock-ups\n");
1651 } else {
1652 wbsd_free_mmc(dev);
1653 return ret;
1654 }
1655 }
1656
1657 /*
1658 * Request resources.
1659 */
1660 ret = wbsd_request_resources(host, base, irq, dma);
1661 if (ret) {
1662 wbsd_release_resources(host);
1663 wbsd_free_mmc(dev);
1664 return ret;
1665 }
1666
1667 /*
1668 * See if chip needs to be configured.
1669 */
1670 if (pnp) {
1671 if ((host->config != 0) && !wbsd_chip_validate(host)) {
1672 pr_warn(DRIVER_NAME ": PnP active but chip not configured! You probably have a buggy BIOS. Configuring chip manually.\n");
1673 wbsd_chip_config(host);
1674 }
1675 } else
1676 wbsd_chip_config(host);
1677
1678 /*
1679 * Power Management stuff. No idea how this works.
1680 * Not tested.
1681 */
1682#ifdef CONFIG_PM
1683 if (host->config) {
1684 wbsd_unlock_config(host);
1685 wbsd_write_config(host, WBSD_CONF_PME, value: 0xA0);
1686 wbsd_lock_config(host);
1687 }
1688#endif
1689 /*
1690 * Allow device to initialise itself properly.
1691 */
1692 mdelay(5);
1693
1694 /*
1695 * Reset the chip into a known state.
1696 */
1697 wbsd_init_device(host);
1698
1699 ret = mmc_add_host(mmc);
1700 if (ret) {
1701 if (!pnp)
1702 wbsd_chip_poweroff(host);
1703
1704 wbsd_release_resources(host);
1705 wbsd_free_mmc(dev);
1706 return ret;
1707 }
1708
1709 pr_info("%s: W83L51xD", mmc_hostname(mmc));
1710 if (host->chip_id != 0)
1711 printk(" id %x", (int)host->chip_id);
1712 printk(" at 0x%x irq %d", (int)host->base, (int)host->irq);
1713 if (host->dma >= 0)
1714 printk(" dma %d", (int)host->dma);
1715 else
1716 printk(" FIFO");
1717 if (pnp)
1718 printk(" PnP");
1719 printk("\n");
1720
1721 return 0;
1722}
1723
1724static void wbsd_shutdown(struct device *dev, int pnp)
1725{
1726 struct mmc_host *mmc = dev_get_drvdata(dev);
1727 struct wbsd_host *host;
1728
1729 if (!mmc)
1730 return;
1731
1732 host = mmc_priv(host: mmc);
1733
1734 mmc_remove_host(mmc);
1735
1736 /*
1737 * Power down the SD/MMC function.
1738 */
1739 if (!pnp)
1740 wbsd_chip_poweroff(host);
1741
1742 wbsd_release_resources(host);
1743
1744 wbsd_free_mmc(dev);
1745}
1746
1747/*
1748 * Non-PnP
1749 */
1750
1751static int wbsd_probe(struct platform_device *dev)
1752{
1753 /* Use the module parameters for resources */
1754 return wbsd_init(dev: &dev->dev, base: param_io, irq: param_irq, dma: param_dma, pnp: 0);
1755}
1756
1757static void wbsd_remove(struct platform_device *dev)
1758{
1759 wbsd_shutdown(dev: &dev->dev, pnp: 0);
1760}
1761
1762/*
1763 * PnP
1764 */
1765
1766#ifdef CONFIG_PNP
1767
1768static int
1769wbsd_pnp_probe(struct pnp_dev *pnpdev, const struct pnp_device_id *dev_id)
1770{
1771 int io, irq, dma;
1772
1773 /*
1774 * Get resources from PnP layer.
1775 */
1776 io = pnp_port_start(dev: pnpdev, bar: 0);
1777 irq = pnp_irq(dev: pnpdev, bar: 0);
1778 if (pnp_dma_valid(dev: pnpdev, bar: 0))
1779 dma = pnp_dma(dev: pnpdev, bar: 0);
1780 else
1781 dma = -1;
1782
1783 DBGF("PnP resources: port %3x irq %d dma %d\n", io, irq, dma);
1784
1785 return wbsd_init(dev: &pnpdev->dev, base: io, irq, dma, pnp: 1);
1786}
1787
1788static void wbsd_pnp_remove(struct pnp_dev *dev)
1789{
1790 wbsd_shutdown(dev: &dev->dev, pnp: 1);
1791}
1792
1793#endif /* CONFIG_PNP */
1794
1795/*
1796 * Power management
1797 */
1798
1799#ifdef CONFIG_PM
1800
1801static int wbsd_platform_suspend(struct platform_device *dev,
1802 pm_message_t state)
1803{
1804 struct mmc_host *mmc = platform_get_drvdata(pdev: dev);
1805 struct wbsd_host *host;
1806
1807 if (mmc == NULL)
1808 return 0;
1809
1810 DBGF("Suspending...\n");
1811
1812 host = mmc_priv(host: mmc);
1813
1814 wbsd_chip_poweroff(host);
1815 return 0;
1816}
1817
1818static int wbsd_platform_resume(struct platform_device *dev)
1819{
1820 struct mmc_host *mmc = platform_get_drvdata(pdev: dev);
1821 struct wbsd_host *host;
1822
1823 if (mmc == NULL)
1824 return 0;
1825
1826 DBGF("Resuming...\n");
1827
1828 host = mmc_priv(host: mmc);
1829
1830 wbsd_chip_config(host);
1831
1832 /*
1833 * Allow device to initialise itself properly.
1834 */
1835 mdelay(5);
1836
1837 wbsd_init_device(host);
1838 return 0;
1839}
1840
1841#ifdef CONFIG_PNP
1842
1843static int wbsd_pnp_suspend(struct pnp_dev *pnp_dev, pm_message_t state)
1844{
1845 struct mmc_host *mmc = dev_get_drvdata(dev: &pnp_dev->dev);
1846
1847 if (mmc == NULL)
1848 return 0;
1849
1850 DBGF("Suspending...\n");
1851 return 0;
1852}
1853
1854static int wbsd_pnp_resume(struct pnp_dev *pnp_dev)
1855{
1856 struct mmc_host *mmc = dev_get_drvdata(dev: &pnp_dev->dev);
1857 struct wbsd_host *host;
1858
1859 if (mmc == NULL)
1860 return 0;
1861
1862 DBGF("Resuming...\n");
1863
1864 host = mmc_priv(host: mmc);
1865
1866 /*
1867 * See if chip needs to be configured.
1868 */
1869 if (host->config != 0) {
1870 if (!wbsd_chip_validate(host)) {
1871 pr_warn(DRIVER_NAME ": PnP active but chip not configured! You probably have a buggy BIOS. Configuring chip manually.\n");
1872 wbsd_chip_config(host);
1873 }
1874 }
1875
1876 /*
1877 * Allow device to initialise itself properly.
1878 */
1879 mdelay(5);
1880
1881 wbsd_init_device(host);
1882 return 0;
1883}
1884
1885#endif /* CONFIG_PNP */
1886
1887#else /* CONFIG_PM */
1888
1889#define wbsd_platform_suspend NULL
1890#define wbsd_platform_resume NULL
1891
1892#define wbsd_pnp_suspend NULL
1893#define wbsd_pnp_resume NULL
1894
1895#endif /* CONFIG_PM */
1896
1897static struct platform_device *wbsd_device;
1898
1899static struct platform_driver wbsd_driver = {
1900 .probe = wbsd_probe,
1901 .remove_new = wbsd_remove,
1902 .suspend = wbsd_platform_suspend,
1903 .resume = wbsd_platform_resume,
1904 .driver = {
1905 .name = DRIVER_NAME,
1906 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1907 },
1908};
1909
1910#ifdef CONFIG_PNP
1911
1912static struct pnp_driver wbsd_pnp_driver = {
1913 .name = DRIVER_NAME,
1914 .id_table = pnp_dev_table,
1915 .probe = wbsd_pnp_probe,
1916 .remove = wbsd_pnp_remove,
1917
1918 .suspend = wbsd_pnp_suspend,
1919 .resume = wbsd_pnp_resume,
1920};
1921
1922#endif /* CONFIG_PNP */
1923
1924/*
1925 * Module loading/unloading
1926 */
1927
1928static int __init wbsd_drv_init(void)
1929{
1930 int result;
1931
1932 pr_info(DRIVER_NAME
1933 ": Winbond W83L51xD SD/MMC card interface driver\n");
1934 pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1935
1936#ifdef CONFIG_PNP
1937
1938 if (!param_nopnp) {
1939 result = pnp_register_driver(drv: &wbsd_pnp_driver);
1940 if (result < 0)
1941 return result;
1942 }
1943#endif /* CONFIG_PNP */
1944
1945 if (param_nopnp) {
1946 result = platform_driver_register(&wbsd_driver);
1947 if (result < 0)
1948 return result;
1949
1950 wbsd_device = platform_device_alloc(DRIVER_NAME, id: -1);
1951 if (!wbsd_device) {
1952 platform_driver_unregister(&wbsd_driver);
1953 return -ENOMEM;
1954 }
1955
1956 result = platform_device_add(pdev: wbsd_device);
1957 if (result) {
1958 platform_device_put(pdev: wbsd_device);
1959 platform_driver_unregister(&wbsd_driver);
1960 return result;
1961 }
1962 }
1963
1964 return 0;
1965}
1966
1967static void __exit wbsd_drv_exit(void)
1968{
1969#ifdef CONFIG_PNP
1970
1971 if (!param_nopnp)
1972 pnp_unregister_driver(drv: &wbsd_pnp_driver);
1973
1974#endif /* CONFIG_PNP */
1975
1976 if (param_nopnp) {
1977 platform_device_unregister(wbsd_device);
1978
1979 platform_driver_unregister(&wbsd_driver);
1980 }
1981
1982 DBG("unloaded\n");
1983}
1984
1985module_init(wbsd_drv_init);
1986module_exit(wbsd_drv_exit);
1987#ifdef CONFIG_PNP
1988module_param_hw_named(nopnp, param_nopnp, uint, other, 0444);
1989#endif
1990module_param_hw_named(io, param_io, uint, ioport, 0444);
1991module_param_hw_named(irq, param_irq, uint, irq, 0444);
1992module_param_hw_named(dma, param_dma, int, dma, 0444);
1993
1994MODULE_LICENSE("GPL");
1995MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>");
1996MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver");
1997
1998#ifdef CONFIG_PNP
1999MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)");
2000#endif
2001MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)");
2002MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)");
2003MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)");
2004

source code of linux/drivers/mmc/host/wbsd.c