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Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block
[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 #include <linux/scatterlist.h>
37
38 #include <asm/io.h>
39 #include <asm/dma.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 sg_virt(host->cur_sg);
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 = sg_virt(&sg[i]);
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 = sg_virt(&sg[i]);
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 = -EILSEQ;
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 = -EILSEQ;
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 = 0;
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 = -ENOMEDIUM;
396                 /* Timeout? */
397                 else if (isr & WBSD_INT_TIMEOUT)
398                         cmd->error = -ETIMEDOUT;
399                 /* CRC? */
400                 else if ((cmd->flags & MMC_RSP_CRC) && (isr & WBSD_INT_CRC))
401                         cmd->error = -EILSEQ;
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 = -EINVAL;
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 = -EINVAL;
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 = 0;
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)
728                                 data->error = -EIO;
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) {
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          * Check that there is actually a card in the slot.
771          */
772         if (!(host->flags & WBSD_FCARD_PRESENT)) {
773                 cmd->error = -ENOMEDIUM;
774                 goto done;
775         }
776
777         if (cmd->data) {
778                 /*
779                  * The hardware is so delightfully stupid that it has a list
780                  * of "data" commands. If a command isn't on this list, it'll
781                  * just go back to the idle state and won't send any data
782                  * interrupts.
783                  */
784                 switch (cmd->opcode) {
785                 case 11:
786                 case 17:
787                 case 18:
788                 case 20:
789                 case 24:
790                 case 25:
791                 case 26:
792                 case 27:
793                 case 30:
794                 case 42:
795                 case 56:
796                         break;
797
798                 /* ACMDs. We don't keep track of state, so we just treat them
799                  * like any other command. */
800                 case 51:
801                         break;
802
803                 default:
804 #ifdef CONFIG_MMC_DEBUG
805                         printk(KERN_WARNING "%s: Data command %d is not "
806                                 "supported by this controller.\n",
807                                 mmc_hostname(host->mmc), cmd->opcode);
808 #endif
809                         cmd->error = -EINVAL;
810
811                         goto done;
812                 };
813         }
814
815         /*
816          * Does the request include data?
817          */
818         if (cmd->data) {
819                 wbsd_prepare_data(host, cmd->data);
820
821                 if (cmd->data->error)
822                         goto done;
823         }
824
825         wbsd_send_command(host, cmd);
826
827         /*
828          * If this is a data transfer the request
829          * will be finished after the data has
830          * transfered.
831          */
832         if (cmd->data && !cmd->error) {
833                 /*
834                  * Dirty fix for hardware bug.
835                  */
836                 if (host->dma == -1)
837                         tasklet_schedule(&host->fifo_tasklet);
838
839                 spin_unlock_bh(&host->lock);
840
841                 return;
842         }
843
844 done:
845         wbsd_request_end(host, mrq);
846
847         spin_unlock_bh(&host->lock);
848 }
849
850 static void wbsd_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
851 {
852         struct wbsd_host *host = mmc_priv(mmc);
853         u8 clk, setup, pwr;
854
855         spin_lock_bh(&host->lock);
856
857         /*
858          * Reset the chip on each power off.
859          * Should clear out any weird states.
860          */
861         if (ios->power_mode == MMC_POWER_OFF)
862                 wbsd_init_device(host);
863
864         if (ios->clock >= 24000000)
865                 clk = WBSD_CLK_24M;
866         else if (ios->clock >= 16000000)
867                 clk = WBSD_CLK_16M;
868         else if (ios->clock >= 12000000)
869                 clk = WBSD_CLK_12M;
870         else
871                 clk = WBSD_CLK_375K;
872
873         /*
874          * Only write to the clock register when
875          * there is an actual change.
876          */
877         if (clk != host->clk) {
878                 wbsd_write_index(host, WBSD_IDX_CLK, clk);
879                 host->clk = clk;
880         }
881
882         /*
883          * Power up card.
884          */
885         if (ios->power_mode != MMC_POWER_OFF) {
886                 pwr = inb(host->base + WBSD_CSR);
887                 pwr &= ~WBSD_POWER_N;
888                 outb(pwr, host->base + WBSD_CSR);
889         }
890
891         /*
892          * MMC cards need to have pin 1 high during init.
893          * It wreaks havoc with the card detection though so
894          * that needs to be disabled.
895          */
896         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
897         if (ios->chip_select == MMC_CS_HIGH) {
898                 BUG_ON(ios->bus_width != MMC_BUS_WIDTH_1);
899                 setup |= WBSD_DAT3_H;
900                 host->flags |= WBSD_FIGNORE_DETECT;
901         } else {
902                 if (setup & WBSD_DAT3_H) {
903                         setup &= ~WBSD_DAT3_H;
904
905                         /*
906                          * We cannot resume card detection immediatly
907                          * because of capacitance and delays in the chip.
908                          */
909                         mod_timer(&host->ignore_timer, jiffies + HZ / 100);
910                 }
911         }
912         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
913
914         /*
915          * Store bus width for later. Will be used when
916          * setting up the data transfer.
917          */
918         host->bus_width = ios->bus_width;
919
920         spin_unlock_bh(&host->lock);
921 }
922
923 static int wbsd_get_ro(struct mmc_host *mmc)
924 {
925         struct wbsd_host *host = mmc_priv(mmc);
926         u8 csr;
927
928         spin_lock_bh(&host->lock);
929
930         csr = inb(host->base + WBSD_CSR);
931         csr |= WBSD_MSLED;
932         outb(csr, host->base + WBSD_CSR);
933
934         mdelay(1);
935
936         csr = inb(host->base + WBSD_CSR);
937         csr &= ~WBSD_MSLED;
938         outb(csr, host->base + WBSD_CSR);
939
940         spin_unlock_bh(&host->lock);
941
942         return csr & WBSD_WRPT;
943 }
944
945 static const struct mmc_host_ops wbsd_ops = {
946         .request        = wbsd_request,
947         .set_ios        = wbsd_set_ios,
948         .get_ro         = wbsd_get_ro,
949 };
950
951 /*****************************************************************************\
952  *                                                                           *
953  * Interrupt handling                                                        *
954  *                                                                           *
955 \*****************************************************************************/
956
957 /*
958  * Helper function to reset detection ignore
959  */
960
961 static void wbsd_reset_ignore(unsigned long data)
962 {
963         struct wbsd_host *host = (struct wbsd_host *)data;
964
965         BUG_ON(host == NULL);
966
967         DBG("Resetting card detection ignore\n");
968
969         spin_lock_bh(&host->lock);
970
971         host->flags &= ~WBSD_FIGNORE_DETECT;
972
973         /*
974          * Card status might have changed during the
975          * blackout.
976          */
977         tasklet_schedule(&host->card_tasklet);
978
979         spin_unlock_bh(&host->lock);
980 }
981
982 /*
983  * Tasklets
984  */
985
986 static inline struct mmc_data *wbsd_get_data(struct wbsd_host *host)
987 {
988         WARN_ON(!host->mrq);
989         if (!host->mrq)
990                 return NULL;
991
992         WARN_ON(!host->mrq->cmd);
993         if (!host->mrq->cmd)
994                 return NULL;
995
996         WARN_ON(!host->mrq->cmd->data);
997         if (!host->mrq->cmd->data)
998                 return NULL;
999
1000         return host->mrq->cmd->data;
1001 }
1002
1003 static void wbsd_tasklet_card(unsigned long param)
1004 {
1005         struct wbsd_host *host = (struct wbsd_host *)param;
1006         u8 csr;
1007         int delay = -1;
1008
1009         spin_lock(&host->lock);
1010
1011         if (host->flags & WBSD_FIGNORE_DETECT) {
1012                 spin_unlock(&host->lock);
1013                 return;
1014         }
1015
1016         csr = inb(host->base + WBSD_CSR);
1017         WARN_ON(csr == 0xff);
1018
1019         if (csr & WBSD_CARDPRESENT) {
1020                 if (!(host->flags & WBSD_FCARD_PRESENT)) {
1021                         DBG("Card inserted\n");
1022                         host->flags |= WBSD_FCARD_PRESENT;
1023
1024                         delay = 500;
1025                 }
1026         } else if (host->flags & WBSD_FCARD_PRESENT) {
1027                 DBG("Card removed\n");
1028                 host->flags &= ~WBSD_FCARD_PRESENT;
1029
1030                 if (host->mrq) {
1031                         printk(KERN_ERR "%s: Card removed during transfer!\n",
1032                                 mmc_hostname(host->mmc));
1033                         wbsd_reset(host);
1034
1035                         host->mrq->cmd->error = -ENOMEDIUM;
1036                         tasklet_schedule(&host->finish_tasklet);
1037                 }
1038
1039                 delay = 0;
1040         }
1041
1042         /*
1043          * Unlock first since we might get a call back.
1044          */
1045
1046         spin_unlock(&host->lock);
1047
1048         if (delay != -1)
1049                 mmc_detect_change(host->mmc, msecs_to_jiffies(delay));
1050 }
1051
1052 static void wbsd_tasklet_fifo(unsigned long param)
1053 {
1054         struct wbsd_host *host = (struct wbsd_host *)param;
1055         struct mmc_data *data;
1056
1057         spin_lock(&host->lock);
1058
1059         if (!host->mrq)
1060                 goto end;
1061
1062         data = wbsd_get_data(host);
1063         if (!data)
1064                 goto end;
1065
1066         if (data->flags & MMC_DATA_WRITE)
1067                 wbsd_fill_fifo(host);
1068         else
1069                 wbsd_empty_fifo(host);
1070
1071         /*
1072          * Done?
1073          */
1074         if (host->num_sg == 0) {
1075                 wbsd_write_index(host, WBSD_IDX_FIFOEN, 0);
1076                 tasklet_schedule(&host->finish_tasklet);
1077         }
1078
1079 end:
1080         spin_unlock(&host->lock);
1081 }
1082
1083 static void wbsd_tasklet_crc(unsigned long param)
1084 {
1085         struct wbsd_host *host = (struct wbsd_host *)param;
1086         struct mmc_data *data;
1087
1088         spin_lock(&host->lock);
1089
1090         if (!host->mrq)
1091                 goto end;
1092
1093         data = wbsd_get_data(host);
1094         if (!data)
1095                 goto end;
1096
1097         DBGF("CRC error\n");
1098
1099         data->error = -EILSEQ;
1100
1101         tasklet_schedule(&host->finish_tasklet);
1102
1103 end:
1104         spin_unlock(&host->lock);
1105 }
1106
1107 static void wbsd_tasklet_timeout(unsigned long param)
1108 {
1109         struct wbsd_host *host = (struct wbsd_host *)param;
1110         struct mmc_data *data;
1111
1112         spin_lock(&host->lock);
1113
1114         if (!host->mrq)
1115                 goto end;
1116
1117         data = wbsd_get_data(host);
1118         if (!data)
1119                 goto end;
1120
1121         DBGF("Timeout\n");
1122
1123         data->error = -ETIMEDOUT;
1124
1125         tasklet_schedule(&host->finish_tasklet);
1126
1127 end:
1128         spin_unlock(&host->lock);
1129 }
1130
1131 static void wbsd_tasklet_finish(unsigned long param)
1132 {
1133         struct wbsd_host *host = (struct wbsd_host *)param;
1134         struct mmc_data *data;
1135
1136         spin_lock(&host->lock);
1137
1138         WARN_ON(!host->mrq);
1139         if (!host->mrq)
1140                 goto end;
1141
1142         data = wbsd_get_data(host);
1143         if (!data)
1144                 goto end;
1145
1146         wbsd_finish_data(host, data);
1147
1148 end:
1149         spin_unlock(&host->lock);
1150 }
1151
1152 /*
1153  * Interrupt handling
1154  */
1155
1156 static irqreturn_t wbsd_irq(int irq, void *dev_id)
1157 {
1158         struct wbsd_host *host = dev_id;
1159         int isr;
1160
1161         isr = inb(host->base + WBSD_ISR);
1162
1163         /*
1164          * Was it actually our hardware that caused the interrupt?
1165          */
1166         if (isr == 0xff || isr == 0x00)
1167                 return IRQ_NONE;
1168
1169         host->isr |= isr;
1170
1171         /*
1172          * Schedule tasklets as needed.
1173          */
1174         if (isr & WBSD_INT_CARD)
1175                 tasklet_schedule(&host->card_tasklet);
1176         if (isr & WBSD_INT_FIFO_THRE)
1177                 tasklet_schedule(&host->fifo_tasklet);
1178         if (isr & WBSD_INT_CRC)
1179                 tasklet_hi_schedule(&host->crc_tasklet);
1180         if (isr & WBSD_INT_TIMEOUT)
1181                 tasklet_hi_schedule(&host->timeout_tasklet);
1182         if (isr & WBSD_INT_TC)
1183                 tasklet_schedule(&host->finish_tasklet);
1184
1185         return IRQ_HANDLED;
1186 }
1187
1188 /*****************************************************************************\
1189  *                                                                           *
1190  * Device initialisation and shutdown                                        *
1191  *                                                                           *
1192 \*****************************************************************************/
1193
1194 /*
1195  * Allocate/free MMC structure.
1196  */
1197
1198 static int __devinit wbsd_alloc_mmc(struct device *dev)
1199 {
1200         struct mmc_host *mmc;
1201         struct wbsd_host *host;
1202
1203         /*
1204          * Allocate MMC structure.
1205          */
1206         mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev);
1207         if (!mmc)
1208                 return -ENOMEM;
1209
1210         host = mmc_priv(mmc);
1211         host->mmc = mmc;
1212
1213         host->dma = -1;
1214
1215         /*
1216          * Set host parameters.
1217          */
1218         mmc->ops = &wbsd_ops;
1219         mmc->f_min = 375000;
1220         mmc->f_max = 24000000;
1221         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1222         mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_MULTIWRITE;
1223
1224         spin_lock_init(&host->lock);
1225
1226         /*
1227          * Set up timers
1228          */
1229         init_timer(&host->ignore_timer);
1230         host->ignore_timer.data = (unsigned long)host;
1231         host->ignore_timer.function = wbsd_reset_ignore;
1232
1233         /*
1234          * Maximum number of segments. Worst case is one sector per segment
1235          * so this will be 64kB/512.
1236          */
1237         mmc->max_hw_segs = 128;
1238         mmc->max_phys_segs = 128;
1239
1240         /*
1241          * Maximum request size. Also limited by 64KiB buffer.
1242          */
1243         mmc->max_req_size = 65536;
1244
1245         /*
1246          * Maximum segment size. Could be one segment with the maximum number
1247          * of bytes.
1248          */
1249         mmc->max_seg_size = mmc->max_req_size;
1250
1251         /*
1252          * Maximum block size. We have 12 bits (= 4095) but have to subtract
1253          * space for CRC. So the maximum is 4095 - 4*2 = 4087.
1254          */
1255         mmc->max_blk_size = 4087;
1256
1257         /*
1258          * Maximum block count. There is no real limit so the maximum
1259          * request size will be the only restriction.
1260          */
1261         mmc->max_blk_count = mmc->max_req_size;
1262
1263         dev_set_drvdata(dev, mmc);
1264
1265         return 0;
1266 }
1267
1268 static void wbsd_free_mmc(struct device *dev)
1269 {
1270         struct mmc_host *mmc;
1271         struct wbsd_host *host;
1272
1273         mmc = dev_get_drvdata(dev);
1274         if (!mmc)
1275                 return;
1276
1277         host = mmc_priv(mmc);
1278         BUG_ON(host == NULL);
1279
1280         del_timer_sync(&host->ignore_timer);
1281
1282         mmc_free_host(mmc);
1283
1284         dev_set_drvdata(dev, NULL);
1285 }
1286
1287 /*
1288  * Scan for known chip id:s
1289  */
1290
1291 static int __devinit wbsd_scan(struct wbsd_host *host)
1292 {
1293         int i, j, k;
1294         int id;
1295
1296         /*
1297          * Iterate through all ports, all codes to
1298          * find hardware that is in our known list.
1299          */
1300         for (i = 0; i < ARRAY_SIZE(config_ports); i++) {
1301                 if (!request_region(config_ports[i], 2, DRIVER_NAME))
1302                         continue;
1303
1304                 for (j = 0; j < ARRAY_SIZE(unlock_codes); j++) {
1305                         id = 0xFFFF;
1306
1307                         host->config = config_ports[i];
1308                         host->unlock_code = unlock_codes[j];
1309
1310                         wbsd_unlock_config(host);
1311
1312                         outb(WBSD_CONF_ID_HI, config_ports[i]);
1313                         id = inb(config_ports[i] + 1) << 8;
1314
1315                         outb(WBSD_CONF_ID_LO, config_ports[i]);
1316                         id |= inb(config_ports[i] + 1);
1317
1318                         wbsd_lock_config(host);
1319
1320                         for (k = 0; k < ARRAY_SIZE(valid_ids); k++) {
1321                                 if (id == valid_ids[k]) {
1322                                         host->chip_id = id;
1323
1324                                         return 0;
1325                                 }
1326                         }
1327
1328                         if (id != 0xFFFF) {
1329                                 DBG("Unknown hardware (id %x) found at %x\n",
1330                                         id, config_ports[i]);
1331                         }
1332                 }
1333
1334                 release_region(config_ports[i], 2);
1335         }
1336
1337         host->config = 0;
1338         host->unlock_code = 0;
1339
1340         return -ENODEV;
1341 }
1342
1343 /*
1344  * Allocate/free io port ranges
1345  */
1346
1347 static int __devinit wbsd_request_region(struct wbsd_host *host, int base)
1348 {
1349         if (base & 0x7)
1350                 return -EINVAL;
1351
1352         if (!request_region(base, 8, DRIVER_NAME))
1353                 return -EIO;
1354
1355         host->base = base;
1356
1357         return 0;
1358 }
1359
1360 static void wbsd_release_regions(struct wbsd_host *host)
1361 {
1362         if (host->base)
1363                 release_region(host->base, 8);
1364
1365         host->base = 0;
1366
1367         if (host->config)
1368                 release_region(host->config, 2);
1369
1370         host->config = 0;
1371 }
1372
1373 /*
1374  * Allocate/free DMA port and buffer
1375  */
1376
1377 static void __devinit wbsd_request_dma(struct wbsd_host *host, int dma)
1378 {
1379         if (dma < 0)
1380                 return;
1381
1382         if (request_dma(dma, DRIVER_NAME))
1383                 goto err;
1384
1385         /*
1386          * We need to allocate a special buffer in
1387          * order for ISA to be able to DMA to it.
1388          */
1389         host->dma_buffer = kmalloc(WBSD_DMA_SIZE,
1390                 GFP_NOIO | GFP_DMA | __GFP_REPEAT | __GFP_NOWARN);
1391         if (!host->dma_buffer)
1392                 goto free;
1393
1394         /*
1395          * Translate the address to a physical address.
1396          */
1397         host->dma_addr = dma_map_single(mmc_dev(host->mmc), host->dma_buffer,
1398                 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1399
1400         /*
1401          * ISA DMA must be aligned on a 64k basis.
1402          */
1403         if ((host->dma_addr & 0xffff) != 0)
1404                 goto kfree;
1405         /*
1406          * ISA cannot access memory above 16 MB.
1407          */
1408         else if (host->dma_addr >= 0x1000000)
1409                 goto kfree;
1410
1411         host->dma = dma;
1412
1413         return;
1414
1415 kfree:
1416         /*
1417          * If we've gotten here then there is some kind of alignment bug
1418          */
1419         BUG_ON(1);
1420
1421         dma_unmap_single(mmc_dev(host->mmc), host->dma_addr,
1422                 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1423         host->dma_addr = (dma_addr_t)NULL;
1424
1425         kfree(host->dma_buffer);
1426         host->dma_buffer = NULL;
1427
1428 free:
1429         free_dma(dma);
1430
1431 err:
1432         printk(KERN_WARNING DRIVER_NAME ": Unable to allocate DMA %d. "
1433                 "Falling back on FIFO.\n", dma);
1434 }
1435
1436 static void wbsd_release_dma(struct wbsd_host *host)
1437 {
1438         if (host->dma_addr) {
1439                 dma_unmap_single(mmc_dev(host->mmc), host->dma_addr,
1440                         WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1441         }
1442         kfree(host->dma_buffer);
1443         if (host->dma >= 0)
1444                 free_dma(host->dma);
1445
1446         host->dma = -1;
1447         host->dma_buffer = NULL;
1448         host->dma_addr = (dma_addr_t)NULL;
1449 }
1450
1451 /*
1452  * Allocate/free IRQ.
1453  */
1454
1455 static int __devinit wbsd_request_irq(struct wbsd_host *host, int irq)
1456 {
1457         int ret;
1458
1459         /*
1460          * Set up tasklets. Must be done before requesting interrupt.
1461          */
1462         tasklet_init(&host->card_tasklet, wbsd_tasklet_card,
1463                         (unsigned long)host);
1464         tasklet_init(&host->fifo_tasklet, wbsd_tasklet_fifo,
1465                         (unsigned long)host);
1466         tasklet_init(&host->crc_tasklet, wbsd_tasklet_crc,
1467                         (unsigned long)host);
1468         tasklet_init(&host->timeout_tasklet, wbsd_tasklet_timeout,
1469                         (unsigned long)host);
1470         tasklet_init(&host->finish_tasklet, wbsd_tasklet_finish,
1471                         (unsigned long)host);
1472
1473         /*
1474          * Allocate interrupt.
1475          */
1476         ret = request_irq(irq, wbsd_irq, IRQF_SHARED, DRIVER_NAME, host);
1477         if (ret)
1478                 return ret;
1479
1480         host->irq = irq;
1481
1482         return 0;
1483 }
1484
1485 static void  wbsd_release_irq(struct wbsd_host *host)
1486 {
1487         if (!host->irq)
1488                 return;
1489
1490         free_irq(host->irq, host);
1491
1492         host->irq = 0;
1493
1494         tasklet_kill(&host->card_tasklet);
1495         tasklet_kill(&host->fifo_tasklet);
1496         tasklet_kill(&host->crc_tasklet);
1497         tasklet_kill(&host->timeout_tasklet);
1498         tasklet_kill(&host->finish_tasklet);
1499 }
1500
1501 /*
1502  * Allocate all resources for the host.
1503  */
1504
1505 static int __devinit wbsd_request_resources(struct wbsd_host *host,
1506         int base, int irq, int dma)
1507 {
1508         int ret;
1509
1510         /*
1511          * Allocate I/O ports.
1512          */
1513         ret = wbsd_request_region(host, base);
1514         if (ret)
1515                 return ret;
1516
1517         /*
1518          * Allocate interrupt.
1519          */
1520         ret = wbsd_request_irq(host, irq);
1521         if (ret)
1522                 return ret;
1523
1524         /*
1525          * Allocate DMA.
1526          */
1527         wbsd_request_dma(host, dma);
1528
1529         return 0;
1530 }
1531
1532 /*
1533  * Release all resources for the host.
1534  */
1535
1536 static void wbsd_release_resources(struct wbsd_host *host)
1537 {
1538         wbsd_release_dma(host);
1539         wbsd_release_irq(host);
1540         wbsd_release_regions(host);
1541 }
1542
1543 /*
1544  * Configure the resources the chip should use.
1545  */
1546
1547 static void wbsd_chip_config(struct wbsd_host *host)
1548 {
1549         wbsd_unlock_config(host);
1550
1551         /*
1552          * Reset the chip.
1553          */
1554         wbsd_write_config(host, WBSD_CONF_SWRST, 1);
1555         wbsd_write_config(host, WBSD_CONF_SWRST, 0);
1556
1557         /*
1558          * Select SD/MMC function.
1559          */
1560         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1561
1562         /*
1563          * Set up card detection.
1564          */
1565         wbsd_write_config(host, WBSD_CONF_PINS, WBSD_PINS_DETECT_GP11);
1566
1567         /*
1568          * Configure chip
1569          */
1570         wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8);
1571         wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff);
1572
1573         wbsd_write_config(host, WBSD_CONF_IRQ, host->irq);
1574
1575         if (host->dma >= 0)
1576                 wbsd_write_config(host, WBSD_CONF_DRQ, host->dma);
1577
1578         /*
1579          * Enable and power up chip.
1580          */
1581         wbsd_write_config(host, WBSD_CONF_ENABLE, 1);
1582         wbsd_write_config(host, WBSD_CONF_POWER, 0x20);
1583
1584         wbsd_lock_config(host);
1585 }
1586
1587 /*
1588  * Check that configured resources are correct.
1589  */
1590
1591 static int wbsd_chip_validate(struct wbsd_host *host)
1592 {
1593         int base, irq, dma;
1594
1595         wbsd_unlock_config(host);
1596
1597         /*
1598          * Select SD/MMC function.
1599          */
1600         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1601
1602         /*
1603          * Read configuration.
1604          */
1605         base = wbsd_read_config(host, WBSD_CONF_PORT_HI) << 8;
1606         base |= wbsd_read_config(host, WBSD_CONF_PORT_LO);
1607
1608         irq = wbsd_read_config(host, WBSD_CONF_IRQ);
1609
1610         dma = wbsd_read_config(host, WBSD_CONF_DRQ);
1611
1612         wbsd_lock_config(host);
1613
1614         /*
1615          * Validate against given configuration.
1616          */
1617         if (base != host->base)
1618                 return 0;
1619         if (irq != host->irq)
1620                 return 0;
1621         if ((dma != host->dma) && (host->dma != -1))
1622                 return 0;
1623
1624         return 1;
1625 }
1626
1627 /*
1628  * Powers down the SD function
1629  */
1630
1631 static void wbsd_chip_poweroff(struct wbsd_host *host)
1632 {
1633         wbsd_unlock_config(host);
1634
1635         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1636         wbsd_write_config(host, WBSD_CONF_ENABLE, 0);
1637
1638         wbsd_lock_config(host);
1639 }
1640
1641 /*****************************************************************************\
1642  *                                                                           *
1643  * Devices setup and shutdown                                                *
1644  *                                                                           *
1645 \*****************************************************************************/
1646
1647 static int __devinit wbsd_init(struct device *dev, int base, int irq, int dma,
1648         int pnp)
1649 {
1650         struct wbsd_host *host = NULL;
1651         struct mmc_host *mmc = NULL;
1652         int ret;
1653
1654         ret = wbsd_alloc_mmc(dev);
1655         if (ret)
1656                 return ret;
1657
1658         mmc = dev_get_drvdata(dev);
1659         host = mmc_priv(mmc);
1660
1661         /*
1662          * Scan for hardware.
1663          */
1664         ret = wbsd_scan(host);
1665         if (ret) {
1666                 if (pnp && (ret == -ENODEV)) {
1667                         printk(KERN_WARNING DRIVER_NAME
1668                                 ": Unable to confirm device presence. You may "
1669                                 "experience lock-ups.\n");
1670                 } else {
1671                         wbsd_free_mmc(dev);
1672                         return ret;
1673                 }
1674         }
1675
1676         /*
1677          * Request resources.
1678          */
1679         ret = wbsd_request_resources(host, base, irq, dma);
1680         if (ret) {
1681                 wbsd_release_resources(host);
1682                 wbsd_free_mmc(dev);
1683                 return ret;
1684         }
1685
1686         /*
1687          * See if chip needs to be configured.
1688          */
1689         if (pnp) {
1690                 if ((host->config != 0) && !wbsd_chip_validate(host)) {
1691                         printk(KERN_WARNING DRIVER_NAME
1692                                 ": PnP active but chip not configured! "
1693                                 "You probably have a buggy BIOS. "
1694                                 "Configuring chip manually.\n");
1695                         wbsd_chip_config(host);
1696                 }
1697         } else
1698                 wbsd_chip_config(host);
1699
1700         /*
1701          * Power Management stuff. No idea how this works.
1702          * Not tested.
1703          */
1704 #ifdef CONFIG_PM
1705         if (host->config) {
1706                 wbsd_unlock_config(host);
1707                 wbsd_write_config(host, WBSD_CONF_PME, 0xA0);
1708                 wbsd_lock_config(host);
1709         }
1710 #endif
1711         /*
1712          * Allow device to initialise itself properly.
1713          */
1714         mdelay(5);
1715
1716         /*
1717          * Reset the chip into a known state.
1718          */
1719         wbsd_init_device(host);
1720
1721         mmc_add_host(mmc);
1722
1723         printk(KERN_INFO "%s: W83L51xD", mmc_hostname(mmc));
1724         if (host->chip_id != 0)
1725                 printk(" id %x", (int)host->chip_id);
1726         printk(" at 0x%x irq %d", (int)host->base, (int)host->irq);
1727         if (host->dma >= 0)
1728                 printk(" dma %d", (int)host->dma);
1729         else
1730                 printk(" FIFO");
1731         if (pnp)
1732                 printk(" PnP");
1733         printk("\n");
1734
1735         return 0;
1736 }
1737
1738 static void __devexit wbsd_shutdown(struct device *dev, int pnp)
1739 {
1740         struct mmc_host *mmc = dev_get_drvdata(dev);
1741         struct wbsd_host *host;
1742
1743         if (!mmc)
1744                 return;
1745
1746         host = mmc_priv(mmc);
1747
1748         mmc_remove_host(mmc);
1749
1750         /*
1751          * Power down the SD/MMC function.
1752          */
1753         if (!pnp)
1754                 wbsd_chip_poweroff(host);
1755
1756         wbsd_release_resources(host);
1757
1758         wbsd_free_mmc(dev);
1759 }
1760
1761 /*
1762  * Non-PnP
1763  */
1764
1765 static int __devinit wbsd_probe(struct platform_device *dev)
1766 {
1767         /* Use the module parameters for resources */
1768         return wbsd_init(&dev->dev, io, irq, dma, 0);
1769 }
1770
1771 static int __devexit wbsd_remove(struct platform_device *dev)
1772 {
1773         wbsd_shutdown(&dev->dev, 0);
1774
1775         return 0;
1776 }
1777
1778 /*
1779  * PnP
1780  */
1781
1782 #ifdef CONFIG_PNP
1783
1784 static int __devinit
1785 wbsd_pnp_probe(struct pnp_dev *pnpdev, const struct pnp_device_id *dev_id)
1786 {
1787         int io, irq, dma;
1788
1789         /*
1790          * Get resources from PnP layer.
1791          */
1792         io = pnp_port_start(pnpdev, 0);
1793         irq = pnp_irq(pnpdev, 0);
1794         if (pnp_dma_valid(pnpdev, 0))
1795                 dma = pnp_dma(pnpdev, 0);
1796         else
1797                 dma = -1;
1798
1799         DBGF("PnP resources: port %3x irq %d dma %d\n", io, irq, dma);
1800
1801         return wbsd_init(&pnpdev->dev, io, irq, dma, 1);
1802 }
1803
1804 static void __devexit wbsd_pnp_remove(struct pnp_dev *dev)
1805 {
1806         wbsd_shutdown(&dev->dev, 1);
1807 }
1808
1809 #endif /* CONFIG_PNP */
1810
1811 /*
1812  * Power management
1813  */
1814
1815 #ifdef CONFIG_PM
1816
1817 static int wbsd_suspend(struct wbsd_host *host, pm_message_t state)
1818 {
1819         BUG_ON(host == NULL);
1820
1821         return mmc_suspend_host(host->mmc, state);
1822 }
1823
1824 static int wbsd_resume(struct wbsd_host *host)
1825 {
1826         BUG_ON(host == NULL);
1827
1828         wbsd_init_device(host);
1829
1830         return mmc_resume_host(host->mmc);
1831 }
1832
1833 static int wbsd_platform_suspend(struct platform_device *dev,
1834                                  pm_message_t state)
1835 {
1836         struct mmc_host *mmc = platform_get_drvdata(dev);
1837         struct wbsd_host *host;
1838         int ret;
1839
1840         if (mmc == NULL)
1841                 return 0;
1842
1843         DBGF("Suspending...\n");
1844
1845         host = mmc_priv(mmc);
1846
1847         ret = wbsd_suspend(host, state);
1848         if (ret)
1849                 return ret;
1850
1851         wbsd_chip_poweroff(host);
1852
1853         return 0;
1854 }
1855
1856 static int wbsd_platform_resume(struct platform_device *dev)
1857 {
1858         struct mmc_host *mmc = platform_get_drvdata(dev);
1859         struct wbsd_host *host;
1860
1861         if (mmc == NULL)
1862                 return 0;
1863
1864         DBGF("Resuming...\n");
1865
1866         host = mmc_priv(mmc);
1867
1868         wbsd_chip_config(host);
1869
1870         /*
1871          * Allow device to initialise itself properly.
1872          */
1873         mdelay(5);
1874
1875         return wbsd_resume(host);
1876 }
1877
1878 #ifdef CONFIG_PNP
1879
1880 static int wbsd_pnp_suspend(struct pnp_dev *pnp_dev, pm_message_t state)
1881 {
1882         struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
1883         struct wbsd_host *host;
1884
1885         if (mmc == NULL)
1886                 return 0;
1887
1888         DBGF("Suspending...\n");
1889
1890         host = mmc_priv(mmc);
1891
1892         return wbsd_suspend(host, state);
1893 }
1894
1895 static int wbsd_pnp_resume(struct pnp_dev *pnp_dev)
1896 {
1897         struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
1898         struct wbsd_host *host;
1899
1900         if (mmc == NULL)
1901                 return 0;
1902
1903         DBGF("Resuming...\n");
1904
1905         host = mmc_priv(mmc);
1906
1907         /*
1908          * See if chip needs to be configured.
1909          */
1910         if (host->config != 0) {
1911                 if (!wbsd_chip_validate(host)) {
1912                         printk(KERN_WARNING DRIVER_NAME
1913                                 ": PnP active but chip not configured! "
1914                                 "You probably have a buggy BIOS. "
1915                                 "Configuring chip manually.\n");
1916                         wbsd_chip_config(host);
1917                 }
1918         }
1919
1920         /*
1921          * Allow device to initialise itself properly.
1922          */
1923         mdelay(5);
1924
1925         return wbsd_resume(host);
1926 }
1927
1928 #endif /* CONFIG_PNP */
1929
1930 #else /* CONFIG_PM */
1931
1932 #define wbsd_platform_suspend NULL
1933 #define wbsd_platform_resume NULL
1934
1935 #define wbsd_pnp_suspend NULL
1936 #define wbsd_pnp_resume NULL
1937
1938 #endif /* CONFIG_PM */
1939
1940 static struct platform_device *wbsd_device;
1941
1942 static struct platform_driver wbsd_driver = {
1943         .probe          = wbsd_probe,
1944         .remove         = __devexit_p(wbsd_remove),
1945
1946         .suspend        = wbsd_platform_suspend,
1947         .resume         = wbsd_platform_resume,
1948         .driver         = {
1949                 .name   = DRIVER_NAME,
1950                 .owner  = THIS_MODULE,
1951         },
1952 };
1953
1954 #ifdef CONFIG_PNP
1955
1956 static struct pnp_driver wbsd_pnp_driver = {
1957         .name           = DRIVER_NAME,
1958         .id_table       = pnp_dev_table,
1959         .probe          = wbsd_pnp_probe,
1960         .remove         = __devexit_p(wbsd_pnp_remove),
1961
1962         .suspend        = wbsd_pnp_suspend,
1963         .resume         = wbsd_pnp_resume,
1964 };
1965
1966 #endif /* CONFIG_PNP */
1967
1968 /*
1969  * Module loading/unloading
1970  */
1971
1972 static int __init wbsd_drv_init(void)
1973 {
1974         int result;
1975
1976         printk(KERN_INFO DRIVER_NAME
1977                 ": Winbond W83L51xD SD/MMC card interface driver\n");
1978         printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1979
1980 #ifdef CONFIG_PNP
1981
1982         if (!nopnp) {
1983                 result = pnp_register_driver(&wbsd_pnp_driver);
1984                 if (result < 0)
1985                         return result;
1986         }
1987 #endif /* CONFIG_PNP */
1988
1989         if (nopnp) {
1990                 result = platform_driver_register(&wbsd_driver);
1991                 if (result < 0)
1992                         return result;
1993
1994                 wbsd_device = platform_device_alloc(DRIVER_NAME, -1);
1995                 if (!wbsd_device) {
1996                         platform_driver_unregister(&wbsd_driver);
1997                         return -ENOMEM;
1998                 }
1999
2000                 result = platform_device_add(wbsd_device);
2001                 if (result) {
2002                         platform_device_put(wbsd_device);
2003                         platform_driver_unregister(&wbsd_driver);
2004                         return result;
2005                 }
2006         }
2007
2008         return 0;
2009 }
2010
2011 static void __exit wbsd_drv_exit(void)
2012 {
2013 #ifdef CONFIG_PNP
2014
2015         if (!nopnp)
2016                 pnp_unregister_driver(&wbsd_pnp_driver);
2017
2018 #endif /* CONFIG_PNP */
2019
2020         if (nopnp) {
2021                 platform_device_unregister(wbsd_device);
2022
2023                 platform_driver_unregister(&wbsd_driver);
2024         }
2025
2026         DBG("unloaded\n");
2027 }
2028
2029 module_init(wbsd_drv_init);
2030 module_exit(wbsd_drv_exit);
2031 #ifdef CONFIG_PNP
2032 module_param(nopnp, uint, 0444);
2033 #endif
2034 module_param(io, uint, 0444);
2035 module_param(irq, uint, 0444);
2036 module_param(dma, int, 0444);
2037
2038 MODULE_LICENSE("GPL");
2039 MODULE_AUTHOR("Pierre Ossman <drzeus@drzeus.cx>");
2040 MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver");
2041
2042 #ifdef CONFIG_PNP
2043 MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)");
2044 #endif
2045 MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)");
2046 MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)");
2047 MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)");