Pull bugzilla-8768 into release branch
[linux-2.6] / drivers / mmc / host / wbsd.c
1 /*
2  *  linux/drivers/mmc/host/wbsd.c - Winbond W83L51xD SD/MMC driver
3  *
4  *  Copyright (C) 2004-2007 Pierre Ossman, All Rights Reserved.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or (at
9  * your option) any later version.
10  *
11  *
12  * Warning!
13  *
14  * Changes to the FIFO system should be done with extreme care since
15  * the hardware is full of bugs related to the FIFO. Known issues are:
16  *
17  * - FIFO size field in FSR is always zero.
18  *
19  * - FIFO interrupts tend not to work as they should. Interrupts are
20  *   triggered only for full/empty events, not for threshold values.
21  *
22  * - On APIC systems the FIFO empty interrupt is sometimes lost.
23  */
24
25 #include <linux/module.h>
26 #include <linux/moduleparam.h>
27 #include <linux/init.h>
28 #include <linux/ioport.h>
29 #include <linux/platform_device.h>
30 #include <linux/interrupt.h>
31 #include <linux/dma-mapping.h>
32 #include <linux/delay.h>
33 #include <linux/pnp.h>
34 #include <linux/highmem.h>
35 #include <linux/mmc/host.h>
36
37 #include <asm/io.h>
38 #include <asm/dma.h>
39 #include <asm/scatterlist.h>
40
41 #include "wbsd.h"
42
43 #define DRIVER_NAME "wbsd"
44
45 #define DBG(x...) \
46         pr_debug(DRIVER_NAME ": " x)
47 #define DBGF(f, x...) \
48         pr_debug(DRIVER_NAME " [%s()]: " f, __func__ , ##x)
49
50 /*
51  * Device resources
52  */
53
54 #ifdef CONFIG_PNP
55
56 static const struct pnp_device_id pnp_dev_table[] = {
57         { "WEC0517", 0 },
58         { "WEC0518", 0 },
59         { "", 0 },
60 };
61
62 MODULE_DEVICE_TABLE(pnp, pnp_dev_table);
63
64 #endif /* CONFIG_PNP */
65
66 static const int config_ports[] = { 0x2E, 0x4E };
67 static const int unlock_codes[] = { 0x83, 0x87 };
68
69 static const int valid_ids[] = {
70         0x7112,
71         };
72
73 #ifdef CONFIG_PNP
74 static unsigned int nopnp = 0;
75 #else
76 static const unsigned int nopnp = 1;
77 #endif
78 static unsigned int io = 0x248;
79 static unsigned int irq = 6;
80 static int dma = 2;
81
82 /*
83  * Basic functions
84  */
85
86 static inline void wbsd_unlock_config(struct wbsd_host *host)
87 {
88         BUG_ON(host->config == 0);
89
90         outb(host->unlock_code, host->config);
91         outb(host->unlock_code, host->config);
92 }
93
94 static inline void wbsd_lock_config(struct wbsd_host *host)
95 {
96         BUG_ON(host->config == 0);
97
98         outb(LOCK_CODE, host->config);
99 }
100
101 static inline void wbsd_write_config(struct wbsd_host *host, u8 reg, u8 value)
102 {
103         BUG_ON(host->config == 0);
104
105         outb(reg, host->config);
106         outb(value, host->config + 1);
107 }
108
109 static inline u8 wbsd_read_config(struct wbsd_host *host, u8 reg)
110 {
111         BUG_ON(host->config == 0);
112
113         outb(reg, host->config);
114         return inb(host->config + 1);
115 }
116
117 static inline void wbsd_write_index(struct wbsd_host *host, u8 index, u8 value)
118 {
119         outb(index, host->base + WBSD_IDXR);
120         outb(value, host->base + WBSD_DATAR);
121 }
122
123 static inline u8 wbsd_read_index(struct wbsd_host *host, u8 index)
124 {
125         outb(index, host->base + WBSD_IDXR);
126         return inb(host->base + WBSD_DATAR);
127 }
128
129 /*
130  * Common routines
131  */
132
133 static void wbsd_init_device(struct wbsd_host *host)
134 {
135         u8 setup, ier;
136
137         /*
138          * Reset chip (SD/MMC part) and fifo.
139          */
140         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
141         setup |= WBSD_FIFO_RESET | WBSD_SOFT_RESET;
142         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
143
144         /*
145          * Set DAT3 to input
146          */
147         setup &= ~WBSD_DAT3_H;
148         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
149         host->flags &= ~WBSD_FIGNORE_DETECT;
150
151         /*
152          * Read back default clock.
153          */
154         host->clk = wbsd_read_index(host, WBSD_IDX_CLK);
155
156         /*
157          * Power down port.
158          */
159         outb(WBSD_POWER_N, host->base + WBSD_CSR);
160
161         /*
162          * Set maximum timeout.
163          */
164         wbsd_write_index(host, WBSD_IDX_TAAC, 0x7F);
165
166         /*
167          * Test for card presence
168          */
169         if (inb(host->base + WBSD_CSR) & WBSD_CARDPRESENT)
170                 host->flags |= WBSD_FCARD_PRESENT;
171         else
172                 host->flags &= ~WBSD_FCARD_PRESENT;
173
174         /*
175          * Enable interesting interrupts.
176          */
177         ier = 0;
178         ier |= WBSD_EINT_CARD;
179         ier |= WBSD_EINT_FIFO_THRE;
180         ier |= WBSD_EINT_CRC;
181         ier |= WBSD_EINT_TIMEOUT;
182         ier |= WBSD_EINT_TC;
183
184         outb(ier, host->base + WBSD_EIR);
185
186         /*
187          * Clear interrupts.
188          */
189         inb(host->base + WBSD_ISR);
190 }
191
192 static void wbsd_reset(struct wbsd_host *host)
193 {
194         u8 setup;
195
196         printk(KERN_ERR "%s: Resetting chip\n", mmc_hostname(host->mmc));
197
198         /*
199          * Soft reset of chip (SD/MMC part).
200          */
201         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
202         setup |= WBSD_SOFT_RESET;
203         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
204 }
205
206 static void wbsd_request_end(struct wbsd_host *host, struct mmc_request *mrq)
207 {
208         unsigned long dmaflags;
209
210         if (host->dma >= 0) {
211                 /*
212                  * Release ISA DMA controller.
213                  */
214                 dmaflags = claim_dma_lock();
215                 disable_dma(host->dma);
216                 clear_dma_ff(host->dma);
217                 release_dma_lock(dmaflags);
218
219                 /*
220                  * Disable DMA on host.
221                  */
222                 wbsd_write_index(host, WBSD_IDX_DMA, 0);
223         }
224
225         host->mrq = NULL;
226
227         /*
228          * MMC layer might call back into the driver so first unlock.
229          */
230         spin_unlock(&host->lock);
231         mmc_request_done(host->mmc, mrq);
232         spin_lock(&host->lock);
233 }
234
235 /*
236  * Scatter/gather functions
237  */
238
239 static inline void wbsd_init_sg(struct wbsd_host *host, struct mmc_data *data)
240 {
241         /*
242          * Get info. about SG list from data structure.
243          */
244         host->cur_sg = data->sg;
245         host->num_sg = data->sg_len;
246
247         host->offset = 0;
248         host->remain = host->cur_sg->length;
249 }
250
251 static inline int wbsd_next_sg(struct wbsd_host *host)
252 {
253         /*
254          * Skip to next SG entry.
255          */
256         host->cur_sg++;
257         host->num_sg--;
258
259         /*
260          * Any entries left?
261          */
262         if (host->num_sg > 0) {
263                 host->offset = 0;
264                 host->remain = host->cur_sg->length;
265         }
266
267         return host->num_sg;
268 }
269
270 static inline char *wbsd_sg_to_buffer(struct wbsd_host *host)
271 {
272         return page_address(host->cur_sg->page) + host->cur_sg->offset;
273 }
274
275 static inline void wbsd_sg_to_dma(struct wbsd_host *host, struct mmc_data *data)
276 {
277         unsigned int len, i;
278         struct scatterlist *sg;
279         char *dmabuf = host->dma_buffer;
280         char *sgbuf;
281
282         sg = data->sg;
283         len = data->sg_len;
284
285         for (i = 0; i < len; i++) {
286                 sgbuf = page_address(sg[i].page) + sg[i].offset;
287                 memcpy(dmabuf, sgbuf, sg[i].length);
288                 dmabuf += sg[i].length;
289         }
290 }
291
292 static inline void wbsd_dma_to_sg(struct wbsd_host *host, struct mmc_data *data)
293 {
294         unsigned int len, i;
295         struct scatterlist *sg;
296         char *dmabuf = host->dma_buffer;
297         char *sgbuf;
298
299         sg = data->sg;
300         len = data->sg_len;
301
302         for (i = 0; i < len; i++) {
303                 sgbuf = page_address(sg[i].page) + sg[i].offset;
304                 memcpy(sgbuf, dmabuf, sg[i].length);
305                 dmabuf += sg[i].length;
306         }
307 }
308
309 /*
310  * Command handling
311  */
312
313 static inline void wbsd_get_short_reply(struct wbsd_host *host,
314                                         struct mmc_command *cmd)
315 {
316         /*
317          * Correct response type?
318          */
319         if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_SHORT) {
320                 cmd->error = MMC_ERR_INVALID;
321                 return;
322         }
323
324         cmd->resp[0]  = wbsd_read_index(host, WBSD_IDX_RESP12) << 24;
325         cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP13) << 16;
326         cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP14) << 8;
327         cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP15) << 0;
328         cmd->resp[1]  = wbsd_read_index(host, WBSD_IDX_RESP16) << 24;
329 }
330
331 static inline void wbsd_get_long_reply(struct wbsd_host *host,
332         struct mmc_command *cmd)
333 {
334         int i;
335
336         /*
337          * Correct response type?
338          */
339         if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_LONG) {
340                 cmd->error = MMC_ERR_INVALID;
341                 return;
342         }
343
344         for (i = 0; i < 4; i++) {
345                 cmd->resp[i] =
346                         wbsd_read_index(host, WBSD_IDX_RESP1 + i * 4) << 24;
347                 cmd->resp[i] |=
348                         wbsd_read_index(host, WBSD_IDX_RESP2 + i * 4) << 16;
349                 cmd->resp[i] |=
350                         wbsd_read_index(host, WBSD_IDX_RESP3 + i * 4) << 8;
351                 cmd->resp[i] |=
352                         wbsd_read_index(host, WBSD_IDX_RESP4 + i * 4) << 0;
353         }
354 }
355
356 static void wbsd_send_command(struct wbsd_host *host, struct mmc_command *cmd)
357 {
358         int i;
359         u8 status, isr;
360
361         /*
362          * Clear accumulated ISR. The interrupt routine
363          * will fill this one with events that occur during
364          * transfer.
365          */
366         host->isr = 0;
367
368         /*
369          * Send the command (CRC calculated by host).
370          */
371         outb(cmd->opcode, host->base + WBSD_CMDR);
372         for (i = 3; i >= 0; i--)
373                 outb((cmd->arg >> (i * 8)) & 0xff, host->base + WBSD_CMDR);
374
375         cmd->error = MMC_ERR_NONE;
376
377         /*
378          * Wait for the request to complete.
379          */
380         do {
381                 status = wbsd_read_index(host, WBSD_IDX_STATUS);
382         } while (status & WBSD_CARDTRAFFIC);
383
384         /*
385          * Do we expect a reply?
386          */
387         if (cmd->flags & MMC_RSP_PRESENT) {
388                 /*
389                  * Read back status.
390                  */
391                 isr = host->isr;
392
393                 /* Card removed? */
394                 if (isr & WBSD_INT_CARD)
395                         cmd->error = MMC_ERR_TIMEOUT;
396                 /* Timeout? */
397                 else if (isr & WBSD_INT_TIMEOUT)
398                         cmd->error = MMC_ERR_TIMEOUT;
399                 /* CRC? */
400                 else if ((cmd->flags & MMC_RSP_CRC) && (isr & WBSD_INT_CRC))
401                         cmd->error = MMC_ERR_BADCRC;
402                 /* All ok */
403                 else {
404                         if (cmd->flags & MMC_RSP_136)
405                                 wbsd_get_long_reply(host, cmd);
406                         else
407                                 wbsd_get_short_reply(host, cmd);
408                 }
409         }
410 }
411
412 /*
413  * Data functions
414  */
415
416 static void wbsd_empty_fifo(struct wbsd_host *host)
417 {
418         struct mmc_data *data = host->mrq->cmd->data;
419         char *buffer;
420         int i, fsr, fifo;
421
422         /*
423          * Handle excessive data.
424          */
425         if (host->num_sg == 0)
426                 return;
427
428         buffer = wbsd_sg_to_buffer(host) + host->offset;
429
430         /*
431          * Drain the fifo. This has a tendency to loop longer
432          * than the FIFO length (usually one block).
433          */
434         while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_EMPTY)) {
435                 /*
436                  * The size field in the FSR is broken so we have to
437                  * do some guessing.
438                  */
439                 if (fsr & WBSD_FIFO_FULL)
440                         fifo = 16;
441                 else if (fsr & WBSD_FIFO_FUTHRE)
442                         fifo = 8;
443                 else
444                         fifo = 1;
445
446                 for (i = 0; i < fifo; i++) {
447                         *buffer = inb(host->base + WBSD_DFR);
448                         buffer++;
449                         host->offset++;
450                         host->remain--;
451
452                         data->bytes_xfered++;
453
454                         /*
455                          * End of scatter list entry?
456                          */
457                         if (host->remain == 0) {
458                                 /*
459                                  * Get next entry. Check if last.
460                                  */
461                                 if (!wbsd_next_sg(host))
462                                         return;
463
464                                 buffer = wbsd_sg_to_buffer(host);
465                         }
466                 }
467         }
468
469         /*
470          * This is a very dirty hack to solve a
471          * hardware problem. The chip doesn't trigger
472          * FIFO threshold interrupts properly.
473          */
474         if ((data->blocks * data->blksz - data->bytes_xfered) < 16)
475                 tasklet_schedule(&host->fifo_tasklet);
476 }
477
478 static void wbsd_fill_fifo(struct wbsd_host *host)
479 {
480         struct mmc_data *data = host->mrq->cmd->data;
481         char *buffer;
482         int i, fsr, fifo;
483
484         /*
485          * Check that we aren't being called after the
486          * entire buffer has been transfered.
487          */
488         if (host->num_sg == 0)
489                 return;
490
491         buffer = wbsd_sg_to_buffer(host) + host->offset;
492
493         /*
494          * Fill the fifo. This has a tendency to loop longer
495          * than the FIFO length (usually one block).
496          */
497         while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_FULL)) {
498                 /*
499                  * The size field in the FSR is broken so we have to
500                  * do some guessing.
501                  */
502                 if (fsr & WBSD_FIFO_EMPTY)
503                         fifo = 0;
504                 else if (fsr & WBSD_FIFO_EMTHRE)
505                         fifo = 8;
506                 else
507                         fifo = 15;
508
509                 for (i = 16; i > fifo; i--) {
510                         outb(*buffer, host->base + WBSD_DFR);
511                         buffer++;
512                         host->offset++;
513                         host->remain--;
514
515                         data->bytes_xfered++;
516
517                         /*
518                          * End of scatter list entry?
519                          */
520                         if (host->remain == 0) {
521                                 /*
522                                  * Get next entry. Check if last.
523                                  */
524                                 if (!wbsd_next_sg(host))
525                                         return;
526
527                                 buffer = wbsd_sg_to_buffer(host);
528                         }
529                 }
530         }
531
532         /*
533          * The controller stops sending interrupts for
534          * 'FIFO empty' under certain conditions. So we
535          * need to be a bit more pro-active.
536          */
537         tasklet_schedule(&host->fifo_tasklet);
538 }
539
540 static void wbsd_prepare_data(struct wbsd_host *host, struct mmc_data *data)
541 {
542         u16 blksize;
543         u8 setup;
544         unsigned long dmaflags;
545         unsigned int size;
546
547         /*
548          * Calculate size.
549          */
550         size = data->blocks * data->blksz;
551
552         /*
553          * Check timeout values for overflow.
554          * (Yes, some cards cause this value to overflow).
555          */
556         if (data->timeout_ns > 127000000)
557                 wbsd_write_index(host, WBSD_IDX_TAAC, 127);
558         else {
559                 wbsd_write_index(host, WBSD_IDX_TAAC,
560                         data->timeout_ns / 1000000);
561         }
562
563         if (data->timeout_clks > 255)
564                 wbsd_write_index(host, WBSD_IDX_NSAC, 255);
565         else
566                 wbsd_write_index(host, WBSD_IDX_NSAC, data->timeout_clks);
567
568         /*
569          * Inform the chip of how large blocks will be
570          * sent. It needs this to determine when to
571          * calculate CRC.
572          *
573          * Space for CRC must be included in the size.
574          * Two bytes are needed for each data line.
575          */
576         if (host->bus_width == MMC_BUS_WIDTH_1) {
577                 blksize = data->blksz + 2;
578
579                 wbsd_write_index(host, WBSD_IDX_PBSMSB, (blksize >> 4) & 0xF0);
580                 wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
581         } else if (host->bus_width == MMC_BUS_WIDTH_4) {
582                 blksize = data->blksz + 2 * 4;
583
584                 wbsd_write_index(host, WBSD_IDX_PBSMSB,
585                         ((blksize >> 4) & 0xF0) | WBSD_DATA_WIDTH);
586                 wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
587         } else {
588                 data->error = MMC_ERR_INVALID;
589                 return;
590         }
591
592         /*
593          * Clear the FIFO. This is needed even for DMA
594          * transfers since the chip still uses the FIFO
595          * internally.
596          */
597         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
598         setup |= WBSD_FIFO_RESET;
599         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
600
601         /*
602          * DMA transfer?
603          */
604         if (host->dma >= 0) {
605                 /*
606                  * The buffer for DMA is only 64 kB.
607                  */
608                 BUG_ON(size > 0x10000);
609                 if (size > 0x10000) {
610                         data->error = MMC_ERR_INVALID;
611                         return;
612                 }
613
614                 /*
615                  * Transfer data from the SG list to
616                  * the DMA buffer.
617                  */
618                 if (data->flags & MMC_DATA_WRITE)
619                         wbsd_sg_to_dma(host, data);
620
621                 /*
622                  * Initialise the ISA DMA controller.
623                  */
624                 dmaflags = claim_dma_lock();
625                 disable_dma(host->dma);
626                 clear_dma_ff(host->dma);
627                 if (data->flags & MMC_DATA_READ)
628                         set_dma_mode(host->dma, DMA_MODE_READ & ~0x40);
629                 else
630                         set_dma_mode(host->dma, DMA_MODE_WRITE & ~0x40);
631                 set_dma_addr(host->dma, host->dma_addr);
632                 set_dma_count(host->dma, size);
633
634                 enable_dma(host->dma);
635                 release_dma_lock(dmaflags);
636
637                 /*
638                  * Enable DMA on the host.
639                  */
640                 wbsd_write_index(host, WBSD_IDX_DMA, WBSD_DMA_ENABLE);
641         } else {
642                 /*
643                  * This flag is used to keep printk
644                  * output to a minimum.
645                  */
646                 host->firsterr = 1;
647
648                 /*
649                  * Initialise the SG list.
650                  */
651                 wbsd_init_sg(host, data);
652
653                 /*
654                  * Turn off DMA.
655                  */
656                 wbsd_write_index(host, WBSD_IDX_DMA, 0);
657
658                 /*
659                  * Set up FIFO threshold levels (and fill
660                  * buffer if doing a write).
661                  */
662                 if (data->flags & MMC_DATA_READ) {
663                         wbsd_write_index(host, WBSD_IDX_FIFOEN,
664                                 WBSD_FIFOEN_FULL | 8);
665                 } else {
666                         wbsd_write_index(host, WBSD_IDX_FIFOEN,
667                                 WBSD_FIFOEN_EMPTY | 8);
668                         wbsd_fill_fifo(host);
669                 }
670         }
671
672         data->error = MMC_ERR_NONE;
673 }
674
675 static void wbsd_finish_data(struct wbsd_host *host, struct mmc_data *data)
676 {
677         unsigned long dmaflags;
678         int count;
679         u8 status;
680
681         WARN_ON(host->mrq == NULL);
682
683         /*
684          * Send a stop command if needed.
685          */
686         if (data->stop)
687                 wbsd_send_command(host, data->stop);
688
689         /*
690          * Wait for the controller to leave data
691          * transfer state.
692          */
693         do {
694                 status = wbsd_read_index(host, WBSD_IDX_STATUS);
695         } while (status & (WBSD_BLOCK_READ | WBSD_BLOCK_WRITE));
696
697         /*
698          * DMA transfer?
699          */
700         if (host->dma >= 0) {
701                 /*
702                  * Disable DMA on the host.
703                  */
704                 wbsd_write_index(host, WBSD_IDX_DMA, 0);
705
706                 /*
707                  * Turn of ISA DMA controller.
708                  */
709                 dmaflags = claim_dma_lock();
710                 disable_dma(host->dma);
711                 clear_dma_ff(host->dma);
712                 count = get_dma_residue(host->dma);
713                 release_dma_lock(dmaflags);
714
715                 data->bytes_xfered = host->mrq->data->blocks *
716                         host->mrq->data->blksz - count;
717                 data->bytes_xfered -= data->bytes_xfered % data->blksz;
718
719                 /*
720                  * Any leftover data?
721                  */
722                 if (count) {
723                         printk(KERN_ERR "%s: Incomplete DMA transfer. "
724                                 "%d bytes left.\n",
725                                 mmc_hostname(host->mmc), count);
726
727                         if (data->error == MMC_ERR_NONE)
728                                 data->error = MMC_ERR_FAILED;
729                 } else {
730                         /*
731                          * Transfer data from DMA buffer to
732                          * SG list.
733                          */
734                         if (data->flags & MMC_DATA_READ)
735                                 wbsd_dma_to_sg(host, data);
736                 }
737
738                 if (data->error != MMC_ERR_NONE) {
739                         if (data->bytes_xfered)
740                                 data->bytes_xfered -= data->blksz;
741                 }
742         }
743
744         wbsd_request_end(host, host->mrq);
745 }
746
747 /*****************************************************************************\
748  *                                                                           *
749  * MMC layer callbacks                                                       *
750  *                                                                           *
751 \*****************************************************************************/
752
753 static void wbsd_request(struct mmc_host *mmc, struct mmc_request *mrq)
754 {
755         struct wbsd_host *host = mmc_priv(mmc);
756         struct mmc_command *cmd;
757
758         /*
759          * Disable tasklets to avoid a deadlock.
760          */
761         spin_lock_bh(&host->lock);
762
763         BUG_ON(host->mrq != NULL);
764
765         cmd = mrq->cmd;
766
767         host->mrq = mrq;
768
769         /*
770          * If there is no card in the slot then
771          * timeout immediatly.
772          */
773         if (!(host->flags & WBSD_FCARD_PRESENT)) {
774                 cmd->error = MMC_ERR_TIMEOUT;
775                 goto done;
776         }
777
778         if (cmd->data) {
779                 /*
780                  * The hardware is so delightfully stupid that it has a list
781                  * of "data" commands. If a command isn't on this list, it'll
782                  * just go back to the idle state and won't send any data
783                  * interrupts.
784                  */
785                 switch (cmd->opcode) {
786                 case 11:
787                 case 17:
788                 case 18:
789                 case 20:
790                 case 24:
791                 case 25:
792                 case 26:
793                 case 27:
794                 case 30:
795                 case 42:
796                 case 56:
797                         break;
798
799                 /* ACMDs. We don't keep track of state, so we just treat them
800                  * like any other command. */
801                 case 51:
802                         break;
803
804                 default:
805 #ifdef CONFIG_MMC_DEBUG
806                         printk(KERN_WARNING "%s: Data command %d is not "
807                                 "supported by this controller.\n",
808                                 mmc_hostname(host->mmc), cmd->opcode);
809 #endif
810                         cmd->error = MMC_ERR_INVALID;
811
812                         goto done;
813                 };
814         }
815
816         /*
817          * Does the request include data?
818          */
819         if (cmd->data) {
820                 wbsd_prepare_data(host, cmd->data);
821
822                 if (cmd->data->error != MMC_ERR_NONE)
823                         goto done;
824         }
825
826         wbsd_send_command(host, cmd);
827
828         /*
829          * If this is a data transfer the request
830          * will be finished after the data has
831          * transfered.
832          */
833         if (cmd->data && (cmd->error == MMC_ERR_NONE)) {
834                 /*
835                  * Dirty fix for hardware bug.
836                  */
837                 if (host->dma == -1)
838                         tasklet_schedule(&host->fifo_tasklet);
839
840                 spin_unlock_bh(&host->lock);
841
842                 return;
843         }
844
845 done:
846         wbsd_request_end(host, mrq);
847
848         spin_unlock_bh(&host->lock);
849 }
850
851 static void wbsd_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
852 {
853         struct wbsd_host *host = mmc_priv(mmc);
854         u8 clk, setup, pwr;
855
856         spin_lock_bh(&host->lock);
857
858         /*
859          * Reset the chip on each power off.
860          * Should clear out any weird states.
861          */
862         if (ios->power_mode == MMC_POWER_OFF)
863                 wbsd_init_device(host);
864
865         if (ios->clock >= 24000000)
866                 clk = WBSD_CLK_24M;
867         else if (ios->clock >= 16000000)
868                 clk = WBSD_CLK_16M;
869         else if (ios->clock >= 12000000)
870                 clk = WBSD_CLK_12M;
871         else
872                 clk = WBSD_CLK_375K;
873
874         /*
875          * Only write to the clock register when
876          * there is an actual change.
877          */
878         if (clk != host->clk) {
879                 wbsd_write_index(host, WBSD_IDX_CLK, clk);
880                 host->clk = clk;
881         }
882
883         /*
884          * Power up card.
885          */
886         if (ios->power_mode != MMC_POWER_OFF) {
887                 pwr = inb(host->base + WBSD_CSR);
888                 pwr &= ~WBSD_POWER_N;
889                 outb(pwr, host->base + WBSD_CSR);
890         }
891
892         /*
893          * MMC cards need to have pin 1 high during init.
894          * It wreaks havoc with the card detection though so
895          * that needs to be disabled.
896          */
897         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
898         if (ios->chip_select == MMC_CS_HIGH) {
899                 BUG_ON(ios->bus_width != MMC_BUS_WIDTH_1);
900                 setup |= WBSD_DAT3_H;
901                 host->flags |= WBSD_FIGNORE_DETECT;
902         } else {
903                 if (setup & WBSD_DAT3_H) {
904                         setup &= ~WBSD_DAT3_H;
905
906                         /*
907                          * We cannot resume card detection immediatly
908                          * because of capacitance and delays in the chip.
909                          */
910                         mod_timer(&host->ignore_timer, jiffies + HZ / 100);
911                 }
912         }
913         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
914
915         /*
916          * Store bus width for later. Will be used when
917          * setting up the data transfer.
918          */
919         host->bus_width = ios->bus_width;
920
921         spin_unlock_bh(&host->lock);
922 }
923
924 static int wbsd_get_ro(struct mmc_host *mmc)
925 {
926         struct wbsd_host *host = mmc_priv(mmc);
927         u8 csr;
928
929         spin_lock_bh(&host->lock);
930
931         csr = inb(host->base + WBSD_CSR);
932         csr |= WBSD_MSLED;
933         outb(csr, host->base + WBSD_CSR);
934
935         mdelay(1);
936
937         csr = inb(host->base + WBSD_CSR);
938         csr &= ~WBSD_MSLED;
939         outb(csr, host->base + WBSD_CSR);
940
941         spin_unlock_bh(&host->lock);
942
943         return csr & WBSD_WRPT;
944 }
945
946 static const struct mmc_host_ops wbsd_ops = {
947         .request        = wbsd_request,
948         .set_ios        = wbsd_set_ios,
949         .get_ro         = wbsd_get_ro,
950 };
951
952 /*****************************************************************************\
953  *                                                                           *
954  * Interrupt handling                                                        *
955  *                                                                           *
956 \*****************************************************************************/
957
958 /*
959  * Helper function to reset detection ignore
960  */
961
962 static void wbsd_reset_ignore(unsigned long data)
963 {
964         struct wbsd_host *host = (struct wbsd_host *)data;
965
966         BUG_ON(host == NULL);
967
968         DBG("Resetting card detection ignore\n");
969
970         spin_lock_bh(&host->lock);
971
972         host->flags &= ~WBSD_FIGNORE_DETECT;
973
974         /*
975          * Card status might have changed during the
976          * blackout.
977          */
978         tasklet_schedule(&host->card_tasklet);
979
980         spin_unlock_bh(&host->lock);
981 }
982
983 /*
984  * Tasklets
985  */
986
987 static inline struct mmc_data *wbsd_get_data(struct wbsd_host *host)
988 {
989         WARN_ON(!host->mrq);
990         if (!host->mrq)
991                 return NULL;
992
993         WARN_ON(!host->mrq->cmd);
994         if (!host->mrq->cmd)
995                 return NULL;
996
997         WARN_ON(!host->mrq->cmd->data);
998         if (!host->mrq->cmd->data)
999                 return NULL;
1000
1001         return host->mrq->cmd->data;
1002 }
1003
1004 static void wbsd_tasklet_card(unsigned long param)
1005 {
1006         struct wbsd_host *host = (struct wbsd_host *)param;
1007         u8 csr;
1008         int delay = -1;
1009
1010         spin_lock(&host->lock);
1011
1012         if (host->flags & WBSD_FIGNORE_DETECT) {
1013                 spin_unlock(&host->lock);
1014                 return;
1015         }
1016
1017         csr = inb(host->base + WBSD_CSR);
1018         WARN_ON(csr == 0xff);
1019
1020         if (csr & WBSD_CARDPRESENT) {
1021                 if (!(host->flags & WBSD_FCARD_PRESENT)) {
1022                         DBG("Card inserted\n");
1023                         host->flags |= WBSD_FCARD_PRESENT;
1024
1025                         delay = 500;
1026                 }
1027         } else if (host->flags & WBSD_FCARD_PRESENT) {
1028                 DBG("Card removed\n");
1029                 host->flags &= ~WBSD_FCARD_PRESENT;
1030
1031                 if (host->mrq) {
1032                         printk(KERN_ERR "%s: Card removed during transfer!\n",
1033                                 mmc_hostname(host->mmc));
1034                         wbsd_reset(host);
1035
1036                         host->mrq->cmd->error = MMC_ERR_FAILED;
1037                         tasklet_schedule(&host->finish_tasklet);
1038                 }
1039
1040                 delay = 0;
1041         }
1042
1043         /*
1044          * Unlock first since we might get a call back.
1045          */
1046
1047         spin_unlock(&host->lock);
1048
1049         if (delay != -1)
1050                 mmc_detect_change(host->mmc, msecs_to_jiffies(delay));
1051 }
1052
1053 static void wbsd_tasklet_fifo(unsigned long param)
1054 {
1055         struct wbsd_host *host = (struct wbsd_host *)param;
1056         struct mmc_data *data;
1057
1058         spin_lock(&host->lock);
1059
1060         if (!host->mrq)
1061                 goto end;
1062
1063         data = wbsd_get_data(host);
1064         if (!data)
1065                 goto end;
1066
1067         if (data->flags & MMC_DATA_WRITE)
1068                 wbsd_fill_fifo(host);
1069         else
1070                 wbsd_empty_fifo(host);
1071
1072         /*
1073          * Done?
1074          */
1075         if (host->num_sg == 0) {
1076                 wbsd_write_index(host, WBSD_IDX_FIFOEN, 0);
1077                 tasklet_schedule(&host->finish_tasklet);
1078         }
1079
1080 end:
1081         spin_unlock(&host->lock);
1082 }
1083
1084 static void wbsd_tasklet_crc(unsigned long param)
1085 {
1086         struct wbsd_host *host = (struct wbsd_host *)param;
1087         struct mmc_data *data;
1088
1089         spin_lock(&host->lock);
1090
1091         if (!host->mrq)
1092                 goto end;
1093
1094         data = wbsd_get_data(host);
1095         if (!data)
1096                 goto end;
1097
1098         DBGF("CRC error\n");
1099
1100         data->error = MMC_ERR_BADCRC;
1101
1102         tasklet_schedule(&host->finish_tasklet);
1103
1104 end:
1105         spin_unlock(&host->lock);
1106 }
1107
1108 static void wbsd_tasklet_timeout(unsigned long param)
1109 {
1110         struct wbsd_host *host = (struct wbsd_host *)param;
1111         struct mmc_data *data;
1112
1113         spin_lock(&host->lock);
1114
1115         if (!host->mrq)
1116                 goto end;
1117
1118         data = wbsd_get_data(host);
1119         if (!data)
1120                 goto end;
1121
1122         DBGF("Timeout\n");
1123
1124         data->error = MMC_ERR_TIMEOUT;
1125
1126         tasklet_schedule(&host->finish_tasklet);
1127
1128 end:
1129         spin_unlock(&host->lock);
1130 }
1131
1132 static void wbsd_tasklet_finish(unsigned long param)
1133 {
1134         struct wbsd_host *host = (struct wbsd_host *)param;
1135         struct mmc_data *data;
1136
1137         spin_lock(&host->lock);
1138
1139         WARN_ON(!host->mrq);
1140         if (!host->mrq)
1141                 goto end;
1142
1143         data = wbsd_get_data(host);
1144         if (!data)
1145                 goto end;
1146
1147         wbsd_finish_data(host, data);
1148
1149 end:
1150         spin_unlock(&host->lock);
1151 }
1152
1153 /*
1154  * Interrupt handling
1155  */
1156
1157 static irqreturn_t wbsd_irq(int irq, void *dev_id)
1158 {
1159         struct wbsd_host *host = dev_id;
1160         int isr;
1161
1162         isr = inb(host->base + WBSD_ISR);
1163
1164         /*
1165          * Was it actually our hardware that caused the interrupt?
1166          */
1167         if (isr == 0xff || isr == 0x00)
1168                 return IRQ_NONE;
1169
1170         host->isr |= isr;
1171
1172         /*
1173          * Schedule tasklets as needed.
1174          */
1175         if (isr & WBSD_INT_CARD)
1176                 tasklet_schedule(&host->card_tasklet);
1177         if (isr & WBSD_INT_FIFO_THRE)
1178                 tasklet_schedule(&host->fifo_tasklet);
1179         if (isr & WBSD_INT_CRC)
1180                 tasklet_hi_schedule(&host->crc_tasklet);
1181         if (isr & WBSD_INT_TIMEOUT)
1182                 tasklet_hi_schedule(&host->timeout_tasklet);
1183         if (isr & WBSD_INT_TC)
1184                 tasklet_schedule(&host->finish_tasklet);
1185
1186         return IRQ_HANDLED;
1187 }
1188
1189 /*****************************************************************************\
1190  *                                                                           *
1191  * Device initialisation and shutdown                                        *
1192  *                                                                           *
1193 \*****************************************************************************/
1194
1195 /*
1196  * Allocate/free MMC structure.
1197  */
1198
1199 static int __devinit wbsd_alloc_mmc(struct device *dev)
1200 {
1201         struct mmc_host *mmc;
1202         struct wbsd_host *host;
1203
1204         /*
1205          * Allocate MMC structure.
1206          */
1207         mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev);
1208         if (!mmc)
1209                 return -ENOMEM;
1210
1211         host = mmc_priv(mmc);
1212         host->mmc = mmc;
1213
1214         host->dma = -1;
1215
1216         /*
1217          * Set host parameters.
1218          */
1219         mmc->ops = &wbsd_ops;
1220         mmc->f_min = 375000;
1221         mmc->f_max = 24000000;
1222         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1223         mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_MULTIWRITE | MMC_CAP_BYTEBLOCK;
1224
1225         spin_lock_init(&host->lock);
1226
1227         /*
1228          * Set up timers
1229          */
1230         init_timer(&host->ignore_timer);
1231         host->ignore_timer.data = (unsigned long)host;
1232         host->ignore_timer.function = wbsd_reset_ignore;
1233
1234         /*
1235          * Maximum number of segments. Worst case is one sector per segment
1236          * so this will be 64kB/512.
1237          */
1238         mmc->max_hw_segs = 128;
1239         mmc->max_phys_segs = 128;
1240
1241         /*
1242          * Maximum request size. Also limited by 64KiB buffer.
1243          */
1244         mmc->max_req_size = 65536;
1245
1246         /*
1247          * Maximum segment size. Could be one segment with the maximum number
1248          * of bytes.
1249          */
1250         mmc->max_seg_size = mmc->max_req_size;
1251
1252         /*
1253          * Maximum block size. We have 12 bits (= 4095) but have to subtract
1254          * space for CRC. So the maximum is 4095 - 4*2 = 4087.
1255          */
1256         mmc->max_blk_size = 4087;
1257
1258         /*
1259          * Maximum block count. There is no real limit so the maximum
1260          * request size will be the only restriction.
1261          */
1262         mmc->max_blk_count = mmc->max_req_size;
1263
1264         dev_set_drvdata(dev, mmc);
1265
1266         return 0;
1267 }
1268
1269 static void wbsd_free_mmc(struct device *dev)
1270 {
1271         struct mmc_host *mmc;
1272         struct wbsd_host *host;
1273
1274         mmc = dev_get_drvdata(dev);
1275         if (!mmc)
1276                 return;
1277
1278         host = mmc_priv(mmc);
1279         BUG_ON(host == NULL);
1280
1281         del_timer_sync(&host->ignore_timer);
1282
1283         mmc_free_host(mmc);
1284
1285         dev_set_drvdata(dev, NULL);
1286 }
1287
1288 /*
1289  * Scan for known chip id:s
1290  */
1291
1292 static int __devinit wbsd_scan(struct wbsd_host *host)
1293 {
1294         int i, j, k;
1295         int id;
1296
1297         /*
1298          * Iterate through all ports, all codes to
1299          * find hardware that is in our known list.
1300          */
1301         for (i = 0; i < ARRAY_SIZE(config_ports); i++) {
1302                 if (!request_region(config_ports[i], 2, DRIVER_NAME))
1303                         continue;
1304
1305                 for (j = 0; j < ARRAY_SIZE(unlock_codes); j++) {
1306                         id = 0xFFFF;
1307
1308                         host->config = config_ports[i];
1309                         host->unlock_code = unlock_codes[j];
1310
1311                         wbsd_unlock_config(host);
1312
1313                         outb(WBSD_CONF_ID_HI, config_ports[i]);
1314                         id = inb(config_ports[i] + 1) << 8;
1315
1316                         outb(WBSD_CONF_ID_LO, config_ports[i]);
1317                         id |= inb(config_ports[i] + 1);
1318
1319                         wbsd_lock_config(host);
1320
1321                         for (k = 0; k < ARRAY_SIZE(valid_ids); k++) {
1322                                 if (id == valid_ids[k]) {
1323                                         host->chip_id = id;
1324
1325                                         return 0;
1326                                 }
1327                         }
1328
1329                         if (id != 0xFFFF) {
1330                                 DBG("Unknown hardware (id %x) found at %x\n",
1331                                         id, config_ports[i]);
1332                         }
1333                 }
1334
1335                 release_region(config_ports[i], 2);
1336         }
1337
1338         host->config = 0;
1339         host->unlock_code = 0;
1340
1341         return -ENODEV;
1342 }
1343
1344 /*
1345  * Allocate/free io port ranges
1346  */
1347
1348 static int __devinit wbsd_request_region(struct wbsd_host *host, int base)
1349 {
1350         if (base & 0x7)
1351                 return -EINVAL;
1352
1353         if (!request_region(base, 8, DRIVER_NAME))
1354                 return -EIO;
1355
1356         host->base = base;
1357
1358         return 0;
1359 }
1360
1361 static void wbsd_release_regions(struct wbsd_host *host)
1362 {
1363         if (host->base)
1364                 release_region(host->base, 8);
1365
1366         host->base = 0;
1367
1368         if (host->config)
1369                 release_region(host->config, 2);
1370
1371         host->config = 0;
1372 }
1373
1374 /*
1375  * Allocate/free DMA port and buffer
1376  */
1377
1378 static void __devinit wbsd_request_dma(struct wbsd_host *host, int dma)
1379 {
1380         if (dma < 0)
1381                 return;
1382
1383         if (request_dma(dma, DRIVER_NAME))
1384                 goto err;
1385
1386         /*
1387          * We need to allocate a special buffer in
1388          * order for ISA to be able to DMA to it.
1389          */
1390         host->dma_buffer = kmalloc(WBSD_DMA_SIZE,
1391                 GFP_NOIO | GFP_DMA | __GFP_REPEAT | __GFP_NOWARN);
1392         if (!host->dma_buffer)
1393                 goto free;
1394
1395         /*
1396          * Translate the address to a physical address.
1397          */
1398         host->dma_addr = dma_map_single(mmc_dev(host->mmc), host->dma_buffer,
1399                 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1400
1401         /*
1402          * ISA DMA must be aligned on a 64k basis.
1403          */
1404         if ((host->dma_addr & 0xffff) != 0)
1405                 goto kfree;
1406         /*
1407          * ISA cannot access memory above 16 MB.
1408          */
1409         else if (host->dma_addr >= 0x1000000)
1410                 goto kfree;
1411
1412         host->dma = dma;
1413
1414         return;
1415
1416 kfree:
1417         /*
1418          * If we've gotten here then there is some kind of alignment bug
1419          */
1420         BUG_ON(1);
1421
1422         dma_unmap_single(mmc_dev(host->mmc), host->dma_addr,
1423                 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1424         host->dma_addr = (dma_addr_t)NULL;
1425
1426         kfree(host->dma_buffer);
1427         host->dma_buffer = NULL;
1428
1429 free:
1430         free_dma(dma);
1431
1432 err:
1433         printk(KERN_WARNING DRIVER_NAME ": Unable to allocate DMA %d. "
1434                 "Falling back on FIFO.\n", dma);
1435 }
1436
1437 static void wbsd_release_dma(struct wbsd_host *host)
1438 {
1439         if (host->dma_addr) {
1440                 dma_unmap_single(mmc_dev(host->mmc), host->dma_addr,
1441                         WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1442         }
1443         kfree(host->dma_buffer);
1444         if (host->dma >= 0)
1445                 free_dma(host->dma);
1446
1447         host->dma = -1;
1448         host->dma_buffer = NULL;
1449         host->dma_addr = (dma_addr_t)NULL;
1450 }
1451
1452 /*
1453  * Allocate/free IRQ.
1454  */
1455
1456 static int __devinit wbsd_request_irq(struct wbsd_host *host, int irq)
1457 {
1458         int ret;
1459
1460         /*
1461          * Allocate interrupt.
1462          */
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         /*
1471          * Set up tasklets.
1472          */
1473         tasklet_init(&host->card_tasklet, wbsd_tasklet_card,
1474                         (unsigned long)host);
1475         tasklet_init(&host->fifo_tasklet, wbsd_tasklet_fifo,
1476                         (unsigned long)host);
1477         tasklet_init(&host->crc_tasklet, wbsd_tasklet_crc,
1478                         (unsigned long)host);
1479         tasklet_init(&host->timeout_tasklet, wbsd_tasklet_timeout,
1480                         (unsigned long)host);
1481         tasklet_init(&host->finish_tasklet, wbsd_tasklet_finish,
1482                         (unsigned long)host);
1483
1484         return 0;
1485 }
1486
1487 static void  wbsd_release_irq(struct wbsd_host *host)
1488 {
1489         if (!host->irq)
1490                 return;
1491
1492         free_irq(host->irq, host);
1493
1494         host->irq = 0;
1495
1496         tasklet_kill(&host->card_tasklet);
1497         tasklet_kill(&host->fifo_tasklet);
1498         tasklet_kill(&host->crc_tasklet);
1499         tasklet_kill(&host->timeout_tasklet);
1500         tasklet_kill(&host->finish_tasklet);
1501 }
1502
1503 /*
1504  * Allocate all resources for the host.
1505  */
1506
1507 static int __devinit wbsd_request_resources(struct wbsd_host *host,
1508         int base, int irq, int dma)
1509 {
1510         int ret;
1511
1512         /*
1513          * Allocate I/O ports.
1514          */
1515         ret = wbsd_request_region(host, base);
1516         if (ret)
1517                 return ret;
1518
1519         /*
1520          * Allocate interrupt.
1521          */
1522         ret = wbsd_request_irq(host, irq);
1523         if (ret)
1524                 return ret;
1525
1526         /*
1527          * Allocate DMA.
1528          */
1529         wbsd_request_dma(host, dma);
1530
1531         return 0;
1532 }
1533
1534 /*
1535  * Release all resources for the host.
1536  */
1537
1538 static void wbsd_release_resources(struct wbsd_host *host)
1539 {
1540         wbsd_release_dma(host);
1541         wbsd_release_irq(host);
1542         wbsd_release_regions(host);
1543 }
1544
1545 /*
1546  * Configure the resources the chip should use.
1547  */
1548
1549 static void wbsd_chip_config(struct wbsd_host *host)
1550 {
1551         wbsd_unlock_config(host);
1552
1553         /*
1554          * Reset the chip.
1555          */
1556         wbsd_write_config(host, WBSD_CONF_SWRST, 1);
1557         wbsd_write_config(host, WBSD_CONF_SWRST, 0);
1558
1559         /*
1560          * Select SD/MMC function.
1561          */
1562         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1563
1564         /*
1565          * Set up card detection.
1566          */
1567         wbsd_write_config(host, WBSD_CONF_PINS, WBSD_PINS_DETECT_GP11);
1568
1569         /*
1570          * Configure chip
1571          */
1572         wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8);
1573         wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff);
1574
1575         wbsd_write_config(host, WBSD_CONF_IRQ, host->irq);
1576
1577         if (host->dma >= 0)
1578                 wbsd_write_config(host, WBSD_CONF_DRQ, host->dma);
1579
1580         /*
1581          * Enable and power up chip.
1582          */
1583         wbsd_write_config(host, WBSD_CONF_ENABLE, 1);
1584         wbsd_write_config(host, WBSD_CONF_POWER, 0x20);
1585
1586         wbsd_lock_config(host);
1587 }
1588
1589 /*
1590  * Check that configured resources are correct.
1591  */
1592
1593 static int wbsd_chip_validate(struct wbsd_host *host)
1594 {
1595         int base, irq, dma;
1596
1597         wbsd_unlock_config(host);
1598
1599         /*
1600          * Select SD/MMC function.
1601          */
1602         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1603
1604         /*
1605          * Read configuration.
1606          */
1607         base = wbsd_read_config(host, WBSD_CONF_PORT_HI) << 8;
1608         base |= wbsd_read_config(host, WBSD_CONF_PORT_LO);
1609
1610         irq = wbsd_read_config(host, WBSD_CONF_IRQ);
1611
1612         dma = wbsd_read_config(host, WBSD_CONF_DRQ);
1613
1614         wbsd_lock_config(host);
1615
1616         /*
1617          * Validate against given configuration.
1618          */
1619         if (base != host->base)
1620                 return 0;
1621         if (irq != host->irq)
1622                 return 0;
1623         if ((dma != host->dma) && (host->dma != -1))
1624                 return 0;
1625
1626         return 1;
1627 }
1628
1629 /*
1630  * Powers down the SD function
1631  */
1632
1633 static void wbsd_chip_poweroff(struct wbsd_host *host)
1634 {
1635         wbsd_unlock_config(host);
1636
1637         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1638         wbsd_write_config(host, WBSD_CONF_ENABLE, 0);
1639
1640         wbsd_lock_config(host);
1641 }
1642
1643 /*****************************************************************************\
1644  *                                                                           *
1645  * Devices setup and shutdown                                                *
1646  *                                                                           *
1647 \*****************************************************************************/
1648
1649 static int __devinit wbsd_init(struct device *dev, int base, int irq, int dma,
1650         int pnp)
1651 {
1652         struct wbsd_host *host = NULL;
1653         struct mmc_host *mmc = NULL;
1654         int ret;
1655
1656         ret = wbsd_alloc_mmc(dev);
1657         if (ret)
1658                 return ret;
1659
1660         mmc = dev_get_drvdata(dev);
1661         host = mmc_priv(mmc);
1662
1663         /*
1664          * Scan for hardware.
1665          */
1666         ret = wbsd_scan(host);
1667         if (ret) {
1668                 if (pnp && (ret == -ENODEV)) {
1669                         printk(KERN_WARNING DRIVER_NAME
1670                                 ": Unable to confirm device presence. You may "
1671                                 "experience lock-ups.\n");
1672                 } else {
1673                         wbsd_free_mmc(dev);
1674                         return ret;
1675                 }
1676         }
1677
1678         /*
1679          * Request resources.
1680          */
1681         ret = wbsd_request_resources(host, base, irq, dma);
1682         if (ret) {
1683                 wbsd_release_resources(host);
1684                 wbsd_free_mmc(dev);
1685                 return ret;
1686         }
1687
1688         /*
1689          * See if chip needs to be configured.
1690          */
1691         if (pnp) {
1692                 if ((host->config != 0) && !wbsd_chip_validate(host)) {
1693                         printk(KERN_WARNING DRIVER_NAME
1694                                 ": PnP active but chip not configured! "
1695                                 "You probably have a buggy BIOS. "
1696                                 "Configuring chip manually.\n");
1697                         wbsd_chip_config(host);
1698                 }
1699         } else
1700                 wbsd_chip_config(host);
1701
1702         /*
1703          * Power Management stuff. No idea how this works.
1704          * Not tested.
1705          */
1706 #ifdef CONFIG_PM
1707         if (host->config) {
1708                 wbsd_unlock_config(host);
1709                 wbsd_write_config(host, WBSD_CONF_PME, 0xA0);
1710                 wbsd_lock_config(host);
1711         }
1712 #endif
1713         /*
1714          * Allow device to initialise itself properly.
1715          */
1716         mdelay(5);
1717
1718         /*
1719          * Reset the chip into a known state.
1720          */
1721         wbsd_init_device(host);
1722
1723         mmc_add_host(mmc);
1724
1725         printk(KERN_INFO "%s: W83L51xD", mmc_hostname(mmc));
1726         if (host->chip_id != 0)
1727                 printk(" id %x", (int)host->chip_id);
1728         printk(" at 0x%x irq %d", (int)host->base, (int)host->irq);
1729         if (host->dma >= 0)
1730                 printk(" dma %d", (int)host->dma);
1731         else
1732                 printk(" FIFO");
1733         if (pnp)
1734                 printk(" PnP");
1735         printk("\n");
1736
1737         return 0;
1738 }
1739
1740 static void __devexit wbsd_shutdown(struct device *dev, int pnp)
1741 {
1742         struct mmc_host *mmc = dev_get_drvdata(dev);
1743         struct wbsd_host *host;
1744
1745         if (!mmc)
1746                 return;
1747
1748         host = mmc_priv(mmc);
1749
1750         mmc_remove_host(mmc);
1751
1752         /*
1753          * Power down the SD/MMC function.
1754          */
1755         if (!pnp)
1756                 wbsd_chip_poweroff(host);
1757
1758         wbsd_release_resources(host);
1759
1760         wbsd_free_mmc(dev);
1761 }
1762
1763 /*
1764  * Non-PnP
1765  */
1766
1767 static int __devinit wbsd_probe(struct platform_device *dev)
1768 {
1769         /* Use the module parameters for resources */
1770         return wbsd_init(&dev->dev, io, irq, dma, 0);
1771 }
1772
1773 static int __devexit wbsd_remove(struct platform_device *dev)
1774 {
1775         wbsd_shutdown(&dev->dev, 0);
1776
1777         return 0;
1778 }
1779
1780 /*
1781  * PnP
1782  */
1783
1784 #ifdef CONFIG_PNP
1785
1786 static int __devinit
1787 wbsd_pnp_probe(struct pnp_dev *pnpdev, const struct pnp_device_id *dev_id)
1788 {
1789         int io, irq, dma;
1790
1791         /*
1792          * Get resources from PnP layer.
1793          */
1794         io = pnp_port_start(pnpdev, 0);
1795         irq = pnp_irq(pnpdev, 0);
1796         if (pnp_dma_valid(pnpdev, 0))
1797                 dma = pnp_dma(pnpdev, 0);
1798         else
1799                 dma = -1;
1800
1801         DBGF("PnP resources: port %3x irq %d dma %d\n", io, irq, dma);
1802
1803         return wbsd_init(&pnpdev->dev, io, irq, dma, 1);
1804 }
1805
1806 static void __devexit wbsd_pnp_remove(struct pnp_dev *dev)
1807 {
1808         wbsd_shutdown(&dev->dev, 1);
1809 }
1810
1811 #endif /* CONFIG_PNP */
1812
1813 /*
1814  * Power management
1815  */
1816
1817 #ifdef CONFIG_PM
1818
1819 static int wbsd_suspend(struct wbsd_host *host, pm_message_t state)
1820 {
1821         BUG_ON(host == NULL);
1822
1823         return mmc_suspend_host(host->mmc, state);
1824 }
1825
1826 static int wbsd_resume(struct wbsd_host *host)
1827 {
1828         BUG_ON(host == NULL);
1829
1830         wbsd_init_device(host);
1831
1832         return mmc_resume_host(host->mmc);
1833 }
1834
1835 static int wbsd_platform_suspend(struct platform_device *dev,
1836                                  pm_message_t state)
1837 {
1838         struct mmc_host *mmc = platform_get_drvdata(dev);
1839         struct wbsd_host *host;
1840         int ret;
1841
1842         if (mmc == NULL)
1843                 return 0;
1844
1845         DBGF("Suspending...\n");
1846
1847         host = mmc_priv(mmc);
1848
1849         ret = wbsd_suspend(host, state);
1850         if (ret)
1851                 return ret;
1852
1853         wbsd_chip_poweroff(host);
1854
1855         return 0;
1856 }
1857
1858 static int wbsd_platform_resume(struct platform_device *dev)
1859 {
1860         struct mmc_host *mmc = platform_get_drvdata(dev);
1861         struct wbsd_host *host;
1862
1863         if (mmc == NULL)
1864                 return 0;
1865
1866         DBGF("Resuming...\n");
1867
1868         host = mmc_priv(mmc);
1869
1870         wbsd_chip_config(host);
1871
1872         /*
1873          * Allow device to initialise itself properly.
1874          */
1875         mdelay(5);
1876
1877         return wbsd_resume(host);
1878 }
1879
1880 #ifdef CONFIG_PNP
1881
1882 static int wbsd_pnp_suspend(struct pnp_dev *pnp_dev, pm_message_t state)
1883 {
1884         struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
1885         struct wbsd_host *host;
1886
1887         if (mmc == NULL)
1888                 return 0;
1889
1890         DBGF("Suspending...\n");
1891
1892         host = mmc_priv(mmc);
1893
1894         return wbsd_suspend(host, state);
1895 }
1896
1897 static int wbsd_pnp_resume(struct pnp_dev *pnp_dev)
1898 {
1899         struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
1900         struct wbsd_host *host;
1901
1902         if (mmc == NULL)
1903                 return 0;
1904
1905         DBGF("Resuming...\n");
1906
1907         host = mmc_priv(mmc);
1908
1909         /*
1910          * See if chip needs to be configured.
1911          */
1912         if (host->config != 0) {
1913                 if (!wbsd_chip_validate(host)) {
1914                         printk(KERN_WARNING DRIVER_NAME
1915                                 ": PnP active but chip not configured! "
1916                                 "You probably have a buggy BIOS. "
1917                                 "Configuring chip manually.\n");
1918                         wbsd_chip_config(host);
1919                 }
1920         }
1921
1922         /*
1923          * Allow device to initialise itself properly.
1924          */
1925         mdelay(5);
1926
1927         return wbsd_resume(host);
1928 }
1929
1930 #endif /* CONFIG_PNP */
1931
1932 #else /* CONFIG_PM */
1933
1934 #define wbsd_platform_suspend NULL
1935 #define wbsd_platform_resume NULL
1936
1937 #define wbsd_pnp_suspend NULL
1938 #define wbsd_pnp_resume NULL
1939
1940 #endif /* CONFIG_PM */
1941
1942 static struct platform_device *wbsd_device;
1943
1944 static struct platform_driver wbsd_driver = {
1945         .probe          = wbsd_probe,
1946         .remove         = __devexit_p(wbsd_remove),
1947
1948         .suspend        = wbsd_platform_suspend,
1949         .resume         = wbsd_platform_resume,
1950         .driver         = {
1951                 .name   = DRIVER_NAME,
1952         },
1953 };
1954
1955 #ifdef CONFIG_PNP
1956
1957 static struct pnp_driver wbsd_pnp_driver = {
1958         .name           = DRIVER_NAME,
1959         .id_table       = pnp_dev_table,
1960         .probe          = wbsd_pnp_probe,
1961         .remove         = __devexit_p(wbsd_pnp_remove),
1962
1963         .suspend        = wbsd_pnp_suspend,
1964         .resume         = wbsd_pnp_resume,
1965 };
1966
1967 #endif /* CONFIG_PNP */
1968
1969 /*
1970  * Module loading/unloading
1971  */
1972
1973 static int __init wbsd_drv_init(void)
1974 {
1975         int result;
1976
1977         printk(KERN_INFO DRIVER_NAME
1978                 ": Winbond W83L51xD SD/MMC card interface driver\n");
1979         printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1980
1981 #ifdef CONFIG_PNP
1982
1983         if (!nopnp) {
1984                 result = pnp_register_driver(&wbsd_pnp_driver);
1985                 if (result < 0)
1986                         return result;
1987         }
1988 #endif /* CONFIG_PNP */
1989
1990         if (nopnp) {
1991                 result = platform_driver_register(&wbsd_driver);
1992                 if (result < 0)
1993                         return result;
1994
1995                 wbsd_device = platform_device_alloc(DRIVER_NAME, -1);
1996                 if (!wbsd_device) {
1997                         platform_driver_unregister(&wbsd_driver);
1998                         return -ENOMEM;
1999                 }
2000
2001                 result = platform_device_add(wbsd_device);
2002                 if (result) {
2003                         platform_device_put(wbsd_device);
2004                         platform_driver_unregister(&wbsd_driver);
2005                         return result;
2006                 }
2007         }
2008
2009         return 0;
2010 }
2011
2012 static void __exit wbsd_drv_exit(void)
2013 {
2014 #ifdef CONFIG_PNP
2015
2016         if (!nopnp)
2017                 pnp_unregister_driver(&wbsd_pnp_driver);
2018
2019 #endif /* CONFIG_PNP */
2020
2021         if (nopnp) {
2022                 platform_device_unregister(wbsd_device);
2023
2024                 platform_driver_unregister(&wbsd_driver);
2025         }
2026
2027         DBG("unloaded\n");
2028 }
2029
2030 module_init(wbsd_drv_init);
2031 module_exit(wbsd_drv_exit);
2032 #ifdef CONFIG_PNP
2033 module_param(nopnp, uint, 0444);
2034 #endif
2035 module_param(io, uint, 0444);
2036 module_param(irq, uint, 0444);
2037 module_param(dma, int, 0444);
2038
2039 MODULE_LICENSE("GPL");
2040 MODULE_AUTHOR("Pierre Ossman <drzeus@drzeus.cx>");
2041 MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver");
2042
2043 #ifdef CONFIG_PNP
2044 MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)");
2045 #endif
2046 MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)");
2047 MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)");
2048 MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)");