Merge branch 'master'
[linux-2.6] / drivers / mmc / wbsd.c
1 /*
2  *  linux/drivers/mmc/wbsd.c - Winbond W83L51xD SD/MMC driver
3  *
4  *  Copyright (C) 2004-2005 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 version 2 as
8  * published by the Free Software Foundation.
9  *
10  *
11  * Warning!
12  *
13  * Changes to the FIFO system should be done with extreme care since
14  * the hardware is full of bugs related to the FIFO. Known issues are:
15  *
16  * - FIFO size field in FSR is always zero.
17  *
18  * - FIFO interrupts tend not to work as they should. Interrupts are
19  *   triggered only for full/empty events, not for threshold values.
20  *
21  * - On APIC systems the FIFO empty interrupt is sometimes lost.
22  */
23
24 #include <linux/config.h>
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/mmc/protocol.h>
37
38 #include <asm/io.h>
39 #include <asm/dma.h>
40 #include <asm/scatterlist.h>
41
42 #include "wbsd.h"
43
44 #define DRIVER_NAME "wbsd"
45 #define DRIVER_VERSION "1.4"
46
47 #ifdef CONFIG_MMC_DEBUG
48 #define DBG(x...) \
49         printk(KERN_DEBUG DRIVER_NAME ": " x)
50 #define DBGF(f, x...) \
51         printk(KERN_DEBUG DRIVER_NAME " [%s()]: " f, __func__ , ##x)
52 #else
53 #define DBG(x...)       do { } while (0)
54 #define DBGF(x...)      do { } while (0)
55 #endif
56
57 /*
58  * Device resources
59  */
60
61 #ifdef CONFIG_PNP
62
63 static const struct pnp_device_id pnp_dev_table[] = {
64         { "WEC0517", 0 },
65         { "WEC0518", 0 },
66         { "", 0 },
67 };
68
69 MODULE_DEVICE_TABLE(pnp, pnp_dev_table);
70
71 #endif /* CONFIG_PNP */
72
73 static const int config_ports[] = { 0x2E, 0x4E };
74 static const int unlock_codes[] = { 0x83, 0x87 };
75
76 static const int valid_ids[] = {
77         0x7112,
78         };
79
80 #ifdef CONFIG_PNP
81 static unsigned int nopnp = 0;
82 #else
83 static const unsigned int nopnp = 1;
84 #endif
85 static unsigned int io = 0x248;
86 static unsigned int irq = 6;
87 static int dma = 2;
88
89 /*
90  * Basic functions
91  */
92
93 static inline void wbsd_unlock_config(struct wbsd_host* host)
94 {
95         BUG_ON(host->config == 0);
96
97         outb(host->unlock_code, host->config);
98         outb(host->unlock_code, host->config);
99 }
100
101 static inline void wbsd_lock_config(struct wbsd_host* host)
102 {
103         BUG_ON(host->config == 0);
104
105         outb(LOCK_CODE, host->config);
106 }
107
108 static inline void wbsd_write_config(struct wbsd_host* host, u8 reg, u8 value)
109 {
110         BUG_ON(host->config == 0);
111
112         outb(reg, host->config);
113         outb(value, host->config + 1);
114 }
115
116 static inline u8 wbsd_read_config(struct wbsd_host* host, u8 reg)
117 {
118         BUG_ON(host->config == 0);
119
120         outb(reg, host->config);
121         return inb(host->config + 1);
122 }
123
124 static inline void wbsd_write_index(struct wbsd_host* host, u8 index, u8 value)
125 {
126         outb(index, host->base + WBSD_IDXR);
127         outb(value, host->base + WBSD_DATAR);
128 }
129
130 static inline u8 wbsd_read_index(struct wbsd_host* host, u8 index)
131 {
132         outb(index, host->base + WBSD_IDXR);
133         return inb(host->base + WBSD_DATAR);
134 }
135
136 /*
137  * Common routines
138  */
139
140 static void wbsd_init_device(struct wbsd_host* host)
141 {
142         u8 setup, ier;
143
144         /*
145          * Reset chip (SD/MMC part) and fifo.
146          */
147         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
148         setup |= WBSD_FIFO_RESET | WBSD_SOFT_RESET;
149         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
150
151         /*
152          * Set DAT3 to input
153          */
154         setup &= ~WBSD_DAT3_H;
155         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
156         host->flags &= ~WBSD_FIGNORE_DETECT;
157
158         /*
159          * Read back default clock.
160          */
161         host->clk = wbsd_read_index(host, WBSD_IDX_CLK);
162
163         /*
164          * Power down port.
165          */
166         outb(WBSD_POWER_N, host->base + WBSD_CSR);
167
168         /*
169          * Set maximum timeout.
170          */
171         wbsd_write_index(host, WBSD_IDX_TAAC, 0x7F);
172
173         /*
174          * Test for card presence
175          */
176         if (inb(host->base + WBSD_CSR) & WBSD_CARDPRESENT)
177                 host->flags |= WBSD_FCARD_PRESENT;
178         else
179                 host->flags &= ~WBSD_FCARD_PRESENT;
180
181         /*
182          * Enable interesting interrupts.
183          */
184         ier = 0;
185         ier |= WBSD_EINT_CARD;
186         ier |= WBSD_EINT_FIFO_THRE;
187         ier |= WBSD_EINT_CCRC;
188         ier |= WBSD_EINT_TIMEOUT;
189         ier |= WBSD_EINT_CRC;
190         ier |= WBSD_EINT_TC;
191
192         outb(ier, host->base + WBSD_EIR);
193
194         /*
195          * Clear interrupts.
196          */
197         inb(host->base + WBSD_ISR);
198 }
199
200 static void wbsd_reset(struct wbsd_host* host)
201 {
202         u8 setup;
203
204         printk(KERN_ERR "%s: Resetting chip\n", mmc_hostname(host->mmc));
205
206         /*
207          * Soft reset of chip (SD/MMC part).
208          */
209         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
210         setup |= WBSD_SOFT_RESET;
211         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
212 }
213
214 static void wbsd_request_end(struct wbsd_host* host, struct mmc_request* mrq)
215 {
216         unsigned long dmaflags;
217
218         DBGF("Ending request, cmd (%x)\n", mrq->cmd->opcode);
219
220         if (host->dma >= 0)
221         {
222                 /*
223                  * Release ISA DMA controller.
224                  */
225                 dmaflags = claim_dma_lock();
226                 disable_dma(host->dma);
227                 clear_dma_ff(host->dma);
228                 release_dma_lock(dmaflags);
229
230                 /*
231                  * Disable DMA on host.
232                  */
233                 wbsd_write_index(host, WBSD_IDX_DMA, 0);
234         }
235
236         host->mrq = NULL;
237
238         /*
239          * MMC layer might call back into the driver so first unlock.
240          */
241         spin_unlock(&host->lock);
242         mmc_request_done(host->mmc, mrq);
243         spin_lock(&host->lock);
244 }
245
246 /*
247  * Scatter/gather functions
248  */
249
250 static inline void wbsd_init_sg(struct wbsd_host* host, struct mmc_data* data)
251 {
252         /*
253          * Get info. about SG list from data structure.
254          */
255         host->cur_sg = data->sg;
256         host->num_sg = data->sg_len;
257
258         host->offset = 0;
259         host->remain = host->cur_sg->length;
260 }
261
262 static inline int wbsd_next_sg(struct wbsd_host* host)
263 {
264         /*
265          * Skip to next SG entry.
266          */
267         host->cur_sg++;
268         host->num_sg--;
269
270         /*
271          * Any entries left?
272          */
273         if (host->num_sg > 0)
274           {
275             host->offset = 0;
276             host->remain = host->cur_sg->length;
277           }
278
279         return host->num_sg;
280 }
281
282 static inline char* wbsd_kmap_sg(struct wbsd_host* host)
283 {
284         host->mapped_sg = kmap_atomic(host->cur_sg->page, KM_BIO_SRC_IRQ) +
285                 host->cur_sg->offset;
286         return host->mapped_sg;
287 }
288
289 static inline void wbsd_kunmap_sg(struct wbsd_host* host)
290 {
291         kunmap_atomic(host->mapped_sg, KM_BIO_SRC_IRQ);
292 }
293
294 static inline void wbsd_sg_to_dma(struct wbsd_host* host, struct mmc_data* data)
295 {
296         unsigned int len, i, size;
297         struct scatterlist* sg;
298         char* dmabuf = host->dma_buffer;
299         char* sgbuf;
300
301         size = host->size;
302
303         sg = data->sg;
304         len = data->sg_len;
305
306         /*
307          * Just loop through all entries. Size might not
308          * be the entire list though so make sure that
309          * we do not transfer too much.
310          */
311         for (i = 0;i < len;i++)
312         {
313                 sgbuf = kmap_atomic(sg[i].page, KM_BIO_SRC_IRQ) + sg[i].offset;
314                 if (size < sg[i].length)
315                         memcpy(dmabuf, sgbuf, size);
316                 else
317                         memcpy(dmabuf, sgbuf, sg[i].length);
318                 kunmap_atomic(sgbuf, KM_BIO_SRC_IRQ);
319                 dmabuf += sg[i].length;
320
321                 if (size < sg[i].length)
322                         size = 0;
323                 else
324                         size -= sg[i].length;
325
326                 if (size == 0)
327                         break;
328         }
329
330         /*
331          * Check that we didn't get a request to transfer
332          * more data than can fit into the SG list.
333          */
334
335         BUG_ON(size != 0);
336
337         host->size -= size;
338 }
339
340 static inline void wbsd_dma_to_sg(struct wbsd_host* host, struct mmc_data* data)
341 {
342         unsigned int len, i, size;
343         struct scatterlist* sg;
344         char* dmabuf = host->dma_buffer;
345         char* sgbuf;
346
347         size = host->size;
348
349         sg = data->sg;
350         len = data->sg_len;
351
352         /*
353          * Just loop through all entries. Size might not
354          * be the entire list though so make sure that
355          * we do not transfer too much.
356          */
357         for (i = 0;i < len;i++)
358         {
359                 sgbuf = kmap_atomic(sg[i].page, KM_BIO_SRC_IRQ) + sg[i].offset;
360                 if (size < sg[i].length)
361                         memcpy(sgbuf, dmabuf, size);
362                 else
363                         memcpy(sgbuf, dmabuf, sg[i].length);
364                 kunmap_atomic(sgbuf, KM_BIO_SRC_IRQ);
365                 dmabuf += sg[i].length;
366
367                 if (size < sg[i].length)
368                         size = 0;
369                 else
370                         size -= sg[i].length;
371
372                 if (size == 0)
373                         break;
374         }
375
376         /*
377          * Check that we didn't get a request to transfer
378          * more data than can fit into the SG list.
379          */
380
381         BUG_ON(size != 0);
382
383         host->size -= size;
384 }
385
386 /*
387  * Command handling
388  */
389
390 static inline void wbsd_get_short_reply(struct wbsd_host* host,
391         struct mmc_command* cmd)
392 {
393         /*
394          * Correct response type?
395          */
396         if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_SHORT)
397         {
398                 cmd->error = MMC_ERR_INVALID;
399                 return;
400         }
401
402         cmd->resp[0] =
403                 wbsd_read_index(host, WBSD_IDX_RESP12) << 24;
404         cmd->resp[0] |=
405                 wbsd_read_index(host, WBSD_IDX_RESP13) << 16;
406         cmd->resp[0] |=
407                 wbsd_read_index(host, WBSD_IDX_RESP14) << 8;
408         cmd->resp[0] |=
409                 wbsd_read_index(host, WBSD_IDX_RESP15) << 0;
410         cmd->resp[1] =
411                 wbsd_read_index(host, WBSD_IDX_RESP16) << 24;
412 }
413
414 static inline void wbsd_get_long_reply(struct wbsd_host* host,
415         struct mmc_command* cmd)
416 {
417         int i;
418
419         /*
420          * Correct response type?
421          */
422         if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_LONG)
423         {
424                 cmd->error = MMC_ERR_INVALID;
425                 return;
426         }
427
428         for (i = 0;i < 4;i++)
429         {
430                 cmd->resp[i] =
431                         wbsd_read_index(host, WBSD_IDX_RESP1 + i * 4) << 24;
432                 cmd->resp[i] |=
433                         wbsd_read_index(host, WBSD_IDX_RESP2 + i * 4) << 16;
434                 cmd->resp[i] |=
435                         wbsd_read_index(host, WBSD_IDX_RESP3 + i * 4) << 8;
436                 cmd->resp[i] |=
437                         wbsd_read_index(host, WBSD_IDX_RESP4 + i * 4) << 0;
438         }
439 }
440
441 static void wbsd_send_command(struct wbsd_host* host, struct mmc_command* cmd)
442 {
443         int i;
444         u8 status, isr;
445
446         DBGF("Sending cmd (%x)\n", cmd->opcode);
447
448         /*
449          * Clear accumulated ISR. The interrupt routine
450          * will fill this one with events that occur during
451          * transfer.
452          */
453         host->isr = 0;
454
455         /*
456          * Send the command (CRC calculated by host).
457          */
458         outb(cmd->opcode, host->base + WBSD_CMDR);
459         for (i = 3;i >= 0;i--)
460                 outb((cmd->arg >> (i * 8)) & 0xff, host->base + WBSD_CMDR);
461
462         cmd->error = MMC_ERR_NONE;
463
464         /*
465          * Wait for the request to complete.
466          */
467         do {
468                 status = wbsd_read_index(host, WBSD_IDX_STATUS);
469         } while (status & WBSD_CARDTRAFFIC);
470
471         /*
472          * Do we expect a reply?
473          */
474         if ((cmd->flags & MMC_RSP_MASK) != MMC_RSP_NONE)
475         {
476                 /*
477                  * Read back status.
478                  */
479                 isr = host->isr;
480
481                 /* Card removed? */
482                 if (isr & WBSD_INT_CARD)
483                         cmd->error = MMC_ERR_TIMEOUT;
484                 /* Timeout? */
485                 else if (isr & WBSD_INT_TIMEOUT)
486                         cmd->error = MMC_ERR_TIMEOUT;
487                 /* CRC? */
488                 else if ((cmd->flags & MMC_RSP_CRC) && (isr & WBSD_INT_CRC))
489                         cmd->error = MMC_ERR_BADCRC;
490                 /* All ok */
491                 else
492                 {
493                         if ((cmd->flags & MMC_RSP_MASK) == MMC_RSP_SHORT)
494                                 wbsd_get_short_reply(host, cmd);
495                         else
496                                 wbsd_get_long_reply(host, cmd);
497                 }
498         }
499
500         DBGF("Sent cmd (%x), res %d\n", cmd->opcode, cmd->error);
501 }
502
503 /*
504  * Data functions
505  */
506
507 static void wbsd_empty_fifo(struct wbsd_host* host)
508 {
509         struct mmc_data* data = host->mrq->cmd->data;
510         char* buffer;
511         int i, fsr, fifo;
512
513         /*
514          * Handle excessive data.
515          */
516         if (data->bytes_xfered == host->size)
517                 return;
518
519         buffer = wbsd_kmap_sg(host) + host->offset;
520
521         /*
522          * Drain the fifo. This has a tendency to loop longer
523          * than the FIFO length (usually one block).
524          */
525         while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_EMPTY))
526         {
527                 /*
528                  * The size field in the FSR is broken so we have to
529                  * do some guessing.
530                  */
531                 if (fsr & WBSD_FIFO_FULL)
532                         fifo = 16;
533                 else if (fsr & WBSD_FIFO_FUTHRE)
534                         fifo = 8;
535                 else
536                         fifo = 1;
537
538                 for (i = 0;i < fifo;i++)
539                 {
540                         *buffer = inb(host->base + WBSD_DFR);
541                         buffer++;
542                         host->offset++;
543                         host->remain--;
544
545                         data->bytes_xfered++;
546
547                         /*
548                          * Transfer done?
549                          */
550                         if (data->bytes_xfered == host->size)
551                         {
552                                 wbsd_kunmap_sg(host);
553                                 return;
554                         }
555
556                         /*
557                          * End of scatter list entry?
558                          */
559                         if (host->remain == 0)
560                         {
561                                 wbsd_kunmap_sg(host);
562
563                                 /*
564                                  * Get next entry. Check if last.
565                                  */
566                                 if (!wbsd_next_sg(host))
567                                 {
568                                         /*
569                                          * We should never reach this point.
570                                          * It means that we're trying to
571                                          * transfer more blocks than can fit
572                                          * into the scatter list.
573                                          */
574                                         BUG_ON(1);
575
576                                         host->size = data->bytes_xfered;
577
578                                         return;
579                                 }
580
581                                 buffer = wbsd_kmap_sg(host);
582                         }
583                 }
584         }
585
586         wbsd_kunmap_sg(host);
587
588         /*
589          * This is a very dirty hack to solve a
590          * hardware problem. The chip doesn't trigger
591          * FIFO threshold interrupts properly.
592          */
593         if ((host->size - data->bytes_xfered) < 16)
594                 tasklet_schedule(&host->fifo_tasklet);
595 }
596
597 static void wbsd_fill_fifo(struct wbsd_host* host)
598 {
599         struct mmc_data* data = host->mrq->cmd->data;
600         char* buffer;
601         int i, fsr, fifo;
602
603         /*
604          * Check that we aren't being called after the
605          * entire buffer has been transfered.
606          */
607         if (data->bytes_xfered == host->size)
608                 return;
609
610         buffer = wbsd_kmap_sg(host) + host->offset;
611
612         /*
613          * Fill the fifo. This has a tendency to loop longer
614          * than the FIFO length (usually one block).
615          */
616         while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_FULL))
617         {
618                 /*
619                  * The size field in the FSR is broken so we have to
620                  * do some guessing.
621                  */
622                 if (fsr & WBSD_FIFO_EMPTY)
623                         fifo = 0;
624                 else if (fsr & WBSD_FIFO_EMTHRE)
625                         fifo = 8;
626                 else
627                         fifo = 15;
628
629                 for (i = 16;i > fifo;i--)
630                 {
631                         outb(*buffer, host->base + WBSD_DFR);
632                         buffer++;
633                         host->offset++;
634                         host->remain--;
635
636                         data->bytes_xfered++;
637
638                         /*
639                          * Transfer done?
640                          */
641                         if (data->bytes_xfered == host->size)
642                         {
643                                 wbsd_kunmap_sg(host);
644                                 return;
645                         }
646
647                         /*
648                          * End of scatter list entry?
649                          */
650                         if (host->remain == 0)
651                         {
652                                 wbsd_kunmap_sg(host);
653
654                                 /*
655                                  * Get next entry. Check if last.
656                                  */
657                                 if (!wbsd_next_sg(host))
658                                 {
659                                         /*
660                                          * We should never reach this point.
661                                          * It means that we're trying to
662                                          * transfer more blocks than can fit
663                                          * into the scatter list.
664                                          */
665                                         BUG_ON(1);
666
667                                         host->size = data->bytes_xfered;
668
669                                         return;
670                                 }
671
672                                 buffer = wbsd_kmap_sg(host);
673                         }
674                 }
675         }
676
677         wbsd_kunmap_sg(host);
678
679         /*
680          * The controller stops sending interrupts for
681          * 'FIFO empty' under certain conditions. So we
682          * need to be a bit more pro-active.
683          */
684         tasklet_schedule(&host->fifo_tasklet);
685 }
686
687 static void wbsd_prepare_data(struct wbsd_host* host, struct mmc_data* data)
688 {
689         u16 blksize;
690         u8 setup;
691         unsigned long dmaflags;
692
693         DBGF("blksz %04x blks %04x flags %08x\n",
694                 1 << data->blksz_bits, data->blocks, data->flags);
695         DBGF("tsac %d ms nsac %d clk\n",
696                 data->timeout_ns / 1000000, data->timeout_clks);
697
698         /*
699          * Calculate size.
700          */
701         host->size = data->blocks << data->blksz_bits;
702
703         /*
704          * Check timeout values for overflow.
705          * (Yes, some cards cause this value to overflow).
706          */
707         if (data->timeout_ns > 127000000)
708                 wbsd_write_index(host, WBSD_IDX_TAAC, 127);
709         else
710                 wbsd_write_index(host, WBSD_IDX_TAAC, data->timeout_ns/1000000);
711
712         if (data->timeout_clks > 255)
713                 wbsd_write_index(host, WBSD_IDX_NSAC, 255);
714         else
715                 wbsd_write_index(host, WBSD_IDX_NSAC, data->timeout_clks);
716
717         /*
718          * Inform the chip of how large blocks will be
719          * sent. It needs this to determine when to
720          * calculate CRC.
721          *
722          * Space for CRC must be included in the size.
723          * Two bytes are needed for each data line.
724          */
725         if (host->bus_width == MMC_BUS_WIDTH_1)
726         {
727                 blksize = (1 << data->blksz_bits) + 2;
728
729                 wbsd_write_index(host, WBSD_IDX_PBSMSB, (blksize >> 4) & 0xF0);
730                 wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
731         }
732         else if (host->bus_width == MMC_BUS_WIDTH_4)
733         {
734                 blksize = (1 << data->blksz_bits) + 2 * 4;
735
736                 wbsd_write_index(host, WBSD_IDX_PBSMSB, ((blksize >> 4) & 0xF0)
737                         | WBSD_DATA_WIDTH);
738                 wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
739         }
740         else
741         {
742                 data->error = MMC_ERR_INVALID;
743                 return;
744         }
745
746         /*
747          * Clear the FIFO. This is needed even for DMA
748          * transfers since the chip still uses the FIFO
749          * internally.
750          */
751         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
752         setup |= WBSD_FIFO_RESET;
753         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
754
755         /*
756          * DMA transfer?
757          */
758         if (host->dma >= 0)
759         {
760                 /*
761                  * The buffer for DMA is only 64 kB.
762                  */
763                 BUG_ON(host->size > 0x10000);
764                 if (host->size > 0x10000)
765                 {
766                         data->error = MMC_ERR_INVALID;
767                         return;
768                 }
769
770                 /*
771                  * Transfer data from the SG list to
772                  * the DMA buffer.
773                  */
774                 if (data->flags & MMC_DATA_WRITE)
775                         wbsd_sg_to_dma(host, data);
776
777                 /*
778                  * Initialise the ISA DMA controller.
779                  */
780                 dmaflags = claim_dma_lock();
781                 disable_dma(host->dma);
782                 clear_dma_ff(host->dma);
783                 if (data->flags & MMC_DATA_READ)
784                         set_dma_mode(host->dma, DMA_MODE_READ & ~0x40);
785                 else
786                         set_dma_mode(host->dma, DMA_MODE_WRITE & ~0x40);
787                 set_dma_addr(host->dma, host->dma_addr);
788                 set_dma_count(host->dma, host->size);
789
790                 enable_dma(host->dma);
791                 release_dma_lock(dmaflags);
792
793                 /*
794                  * Enable DMA on the host.
795                  */
796                 wbsd_write_index(host, WBSD_IDX_DMA, WBSD_DMA_ENABLE);
797         }
798         else
799         {
800                 /*
801                  * This flag is used to keep printk
802                  * output to a minimum.
803                  */
804                 host->firsterr = 1;
805
806                 /*
807                  * Initialise the SG list.
808                  */
809                 wbsd_init_sg(host, data);
810
811                 /*
812                  * Turn off DMA.
813                  */
814                 wbsd_write_index(host, WBSD_IDX_DMA, 0);
815
816                 /*
817                  * Set up FIFO threshold levels (and fill
818                  * buffer if doing a write).
819                  */
820                 if (data->flags & MMC_DATA_READ)
821                 {
822                         wbsd_write_index(host, WBSD_IDX_FIFOEN,
823                                 WBSD_FIFOEN_FULL | 8);
824                 }
825                 else
826                 {
827                         wbsd_write_index(host, WBSD_IDX_FIFOEN,
828                                 WBSD_FIFOEN_EMPTY | 8);
829                         wbsd_fill_fifo(host);
830                 }
831         }
832
833         data->error = MMC_ERR_NONE;
834 }
835
836 static void wbsd_finish_data(struct wbsd_host* host, struct mmc_data* data)
837 {
838         unsigned long dmaflags;
839         int count;
840         u8 status;
841
842         WARN_ON(host->mrq == NULL);
843
844         /*
845          * Send a stop command if needed.
846          */
847         if (data->stop)
848                 wbsd_send_command(host, data->stop);
849
850         /*
851          * Wait for the controller to leave data
852          * transfer state.
853          */
854         do
855         {
856                 status = wbsd_read_index(host, WBSD_IDX_STATUS);
857         } while (status & (WBSD_BLOCK_READ | WBSD_BLOCK_WRITE));
858
859         /*
860          * DMA transfer?
861          */
862         if (host->dma >= 0)
863         {
864                 /*
865                  * Disable DMA on the host.
866                  */
867                 wbsd_write_index(host, WBSD_IDX_DMA, 0);
868
869                 /*
870                  * Turn of ISA DMA controller.
871                  */
872                 dmaflags = claim_dma_lock();
873                 disable_dma(host->dma);
874                 clear_dma_ff(host->dma);
875                 count = get_dma_residue(host->dma);
876                 release_dma_lock(dmaflags);
877
878                 /*
879                  * Any leftover data?
880                  */
881                 if (count)
882                 {
883                         printk(KERN_ERR "%s: Incomplete DMA transfer. "
884                                 "%d bytes left.\n",
885                                 mmc_hostname(host->mmc), count);
886
887                         data->error = MMC_ERR_FAILED;
888                 }
889                 else
890                 {
891                         /*
892                          * Transfer data from DMA buffer to
893                          * SG list.
894                          */
895                         if (data->flags & MMC_DATA_READ)
896                                 wbsd_dma_to_sg(host, data);
897
898                         data->bytes_xfered = host->size;
899                 }
900         }
901
902         DBGF("Ending data transfer (%d bytes)\n", data->bytes_xfered);
903
904         wbsd_request_end(host, host->mrq);
905 }
906
907 /*****************************************************************************\
908  *                                                                           *
909  * MMC layer callbacks                                                       *
910  *                                                                           *
911 \*****************************************************************************/
912
913 static void wbsd_request(struct mmc_host* mmc, struct mmc_request* mrq)
914 {
915         struct wbsd_host* host = mmc_priv(mmc);
916         struct mmc_command* cmd;
917
918         /*
919          * Disable tasklets to avoid a deadlock.
920          */
921         spin_lock_bh(&host->lock);
922
923         BUG_ON(host->mrq != NULL);
924
925         cmd = mrq->cmd;
926
927         host->mrq = mrq;
928
929         /*
930          * If there is no card in the slot then
931          * timeout immediatly.
932          */
933         if (!(host->flags & WBSD_FCARD_PRESENT))
934         {
935                 cmd->error = MMC_ERR_TIMEOUT;
936                 goto done;
937         }
938
939         /*
940          * Does the request include data?
941          */
942         if (cmd->data)
943         {
944                 wbsd_prepare_data(host, cmd->data);
945
946                 if (cmd->data->error != MMC_ERR_NONE)
947                         goto done;
948         }
949
950         wbsd_send_command(host, cmd);
951
952         /*
953          * If this is a data transfer the request
954          * will be finished after the data has
955          * transfered.
956          */
957         if (cmd->data && (cmd->error == MMC_ERR_NONE))
958         {
959                 /*
960                  * Dirty fix for hardware bug.
961                  */
962                 if (host->dma == -1)
963                         tasklet_schedule(&host->fifo_tasklet);
964
965                 spin_unlock_bh(&host->lock);
966
967                 return;
968         }
969
970 done:
971         wbsd_request_end(host, mrq);
972
973         spin_unlock_bh(&host->lock);
974 }
975
976 static void wbsd_set_ios(struct mmc_host* mmc, struct mmc_ios* ios)
977 {
978         struct wbsd_host* host = mmc_priv(mmc);
979         u8 clk, setup, pwr;
980
981         DBGF("clock %uHz busmode %u powermode %u cs %u Vdd %u width %u\n",
982              ios->clock, ios->bus_mode, ios->power_mode, ios->chip_select,
983              ios->vdd, ios->bus_width);
984
985         spin_lock_bh(&host->lock);
986
987         /*
988          * Reset the chip on each power off.
989          * Should clear out any weird states.
990          */
991         if (ios->power_mode == MMC_POWER_OFF)
992                 wbsd_init_device(host);
993
994         if (ios->clock >= 24000000)
995                 clk = WBSD_CLK_24M;
996         else if (ios->clock >= 16000000)
997                 clk = WBSD_CLK_16M;
998         else if (ios->clock >= 12000000)
999                 clk = WBSD_CLK_12M;
1000         else
1001                 clk = WBSD_CLK_375K;
1002
1003         /*
1004          * Only write to the clock register when
1005          * there is an actual change.
1006          */
1007         if (clk != host->clk)
1008         {
1009                 wbsd_write_index(host, WBSD_IDX_CLK, clk);
1010                 host->clk = clk;
1011         }
1012
1013         /*
1014          * Power up card.
1015          */
1016         if (ios->power_mode != MMC_POWER_OFF)
1017         {
1018                 pwr = inb(host->base + WBSD_CSR);
1019                 pwr &= ~WBSD_POWER_N;
1020                 outb(pwr, host->base + WBSD_CSR);
1021         }
1022
1023         /*
1024          * MMC cards need to have pin 1 high during init.
1025          * It wreaks havoc with the card detection though so
1026          * that needs to be disabled.
1027          */
1028         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
1029         if (ios->chip_select == MMC_CS_HIGH)
1030         {
1031                 BUG_ON(ios->bus_width != MMC_BUS_WIDTH_1);
1032                 setup |= WBSD_DAT3_H;
1033                 host->flags |= WBSD_FIGNORE_DETECT;
1034         }
1035         else
1036         {
1037                 if (setup & WBSD_DAT3_H)
1038                 {
1039                         setup &= ~WBSD_DAT3_H;
1040
1041                         /*
1042                          * We cannot resume card detection immediatly
1043                          * because of capacitance and delays in the chip.
1044                          */
1045                         mod_timer(&host->ignore_timer, jiffies + HZ/100);
1046                 }
1047         }
1048         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
1049
1050         /*
1051          * Store bus width for later. Will be used when
1052          * setting up the data transfer.
1053          */
1054         host->bus_width = ios->bus_width;
1055
1056         spin_unlock_bh(&host->lock);
1057 }
1058
1059 static int wbsd_get_ro(struct mmc_host* mmc)
1060 {
1061         struct wbsd_host* host = mmc_priv(mmc);
1062         u8 csr;
1063
1064         spin_lock_bh(&host->lock);
1065
1066         csr = inb(host->base + WBSD_CSR);
1067         csr |= WBSD_MSLED;
1068         outb(csr, host->base + WBSD_CSR);
1069
1070         mdelay(1);
1071
1072         csr = inb(host->base + WBSD_CSR);
1073         csr &= ~WBSD_MSLED;
1074         outb(csr, host->base + WBSD_CSR);
1075
1076         spin_unlock_bh(&host->lock);
1077
1078         return csr & WBSD_WRPT;
1079 }
1080
1081 static struct mmc_host_ops wbsd_ops = {
1082         .request        = wbsd_request,
1083         .set_ios        = wbsd_set_ios,
1084         .get_ro         = wbsd_get_ro,
1085 };
1086
1087 /*****************************************************************************\
1088  *                                                                           *
1089  * Interrupt handling                                                        *
1090  *                                                                           *
1091 \*****************************************************************************/
1092
1093 /*
1094  * Helper function to reset detection ignore
1095  */
1096
1097 static void wbsd_reset_ignore(unsigned long data)
1098 {
1099         struct wbsd_host *host = (struct wbsd_host*)data;
1100
1101         BUG_ON(host == NULL);
1102
1103         DBG("Resetting card detection ignore\n");
1104
1105         spin_lock_bh(&host->lock);
1106
1107         host->flags &= ~WBSD_FIGNORE_DETECT;
1108
1109         /*
1110          * Card status might have changed during the
1111          * blackout.
1112          */
1113         tasklet_schedule(&host->card_tasklet);
1114
1115         spin_unlock_bh(&host->lock);
1116 }
1117
1118 /*
1119  * Tasklets
1120  */
1121
1122 static inline struct mmc_data* wbsd_get_data(struct wbsd_host* host)
1123 {
1124         WARN_ON(!host->mrq);
1125         if (!host->mrq)
1126                 return NULL;
1127
1128         WARN_ON(!host->mrq->cmd);
1129         if (!host->mrq->cmd)
1130                 return NULL;
1131
1132         WARN_ON(!host->mrq->cmd->data);
1133         if (!host->mrq->cmd->data)
1134                 return NULL;
1135
1136         return host->mrq->cmd->data;
1137 }
1138
1139 static void wbsd_tasklet_card(unsigned long param)
1140 {
1141         struct wbsd_host* host = (struct wbsd_host*)param;
1142         u8 csr;
1143         int delay = -1;
1144
1145         spin_lock(&host->lock);
1146
1147         if (host->flags & WBSD_FIGNORE_DETECT)
1148         {
1149                 spin_unlock(&host->lock);
1150                 return;
1151         }
1152
1153         csr = inb(host->base + WBSD_CSR);
1154         WARN_ON(csr == 0xff);
1155
1156         if (csr & WBSD_CARDPRESENT)
1157         {
1158                 if (!(host->flags & WBSD_FCARD_PRESENT))
1159                 {
1160                         DBG("Card inserted\n");
1161                         host->flags |= WBSD_FCARD_PRESENT;
1162
1163                         delay = 500;
1164                 }
1165         }
1166         else if (host->flags & WBSD_FCARD_PRESENT)
1167         {
1168                 DBG("Card removed\n");
1169                 host->flags &= ~WBSD_FCARD_PRESENT;
1170
1171                 if (host->mrq)
1172                 {
1173                         printk(KERN_ERR "%s: Card removed during transfer!\n",
1174                                 mmc_hostname(host->mmc));
1175                         wbsd_reset(host);
1176
1177                         host->mrq->cmd->error = MMC_ERR_FAILED;
1178                         tasklet_schedule(&host->finish_tasklet);
1179                 }
1180
1181                 delay = 0;
1182         }
1183
1184         /*
1185          * Unlock first since we might get a call back.
1186          */
1187
1188         spin_unlock(&host->lock);
1189
1190         if (delay != -1)
1191                 mmc_detect_change(host->mmc, msecs_to_jiffies(delay));
1192 }
1193
1194 static void wbsd_tasklet_fifo(unsigned long param)
1195 {
1196         struct wbsd_host* host = (struct wbsd_host*)param;
1197         struct mmc_data* data;
1198
1199         spin_lock(&host->lock);
1200
1201         if (!host->mrq)
1202                 goto end;
1203
1204         data = wbsd_get_data(host);
1205         if (!data)
1206                 goto end;
1207
1208         if (data->flags & MMC_DATA_WRITE)
1209                 wbsd_fill_fifo(host);
1210         else
1211                 wbsd_empty_fifo(host);
1212
1213         /*
1214          * Done?
1215          */
1216         if (host->size == data->bytes_xfered)
1217         {
1218                 wbsd_write_index(host, WBSD_IDX_FIFOEN, 0);
1219                 tasklet_schedule(&host->finish_tasklet);
1220         }
1221
1222 end:
1223         spin_unlock(&host->lock);
1224 }
1225
1226 static void wbsd_tasklet_crc(unsigned long param)
1227 {
1228         struct wbsd_host* host = (struct wbsd_host*)param;
1229         struct mmc_data* data;
1230
1231         spin_lock(&host->lock);
1232
1233         if (!host->mrq)
1234                 goto end;
1235
1236         data = wbsd_get_data(host);
1237         if (!data)
1238                 goto end;
1239
1240         DBGF("CRC error\n");
1241
1242         data->error = MMC_ERR_BADCRC;
1243
1244         tasklet_schedule(&host->finish_tasklet);
1245
1246 end:
1247         spin_unlock(&host->lock);
1248 }
1249
1250 static void wbsd_tasklet_timeout(unsigned long param)
1251 {
1252         struct wbsd_host* host = (struct wbsd_host*)param;
1253         struct mmc_data* data;
1254
1255         spin_lock(&host->lock);
1256
1257         if (!host->mrq)
1258                 goto end;
1259
1260         data = wbsd_get_data(host);
1261         if (!data)
1262                 goto end;
1263
1264         DBGF("Timeout\n");
1265
1266         data->error = MMC_ERR_TIMEOUT;
1267
1268         tasklet_schedule(&host->finish_tasklet);
1269
1270 end:
1271         spin_unlock(&host->lock);
1272 }
1273
1274 static void wbsd_tasklet_finish(unsigned long param)
1275 {
1276         struct wbsd_host* host = (struct wbsd_host*)param;
1277         struct mmc_data* data;
1278
1279         spin_lock(&host->lock);
1280
1281         WARN_ON(!host->mrq);
1282         if (!host->mrq)
1283                 goto end;
1284
1285         data = wbsd_get_data(host);
1286         if (!data)
1287                 goto end;
1288
1289         wbsd_finish_data(host, data);
1290
1291 end:
1292         spin_unlock(&host->lock);
1293 }
1294
1295 static void wbsd_tasklet_block(unsigned long param)
1296 {
1297         struct wbsd_host* host = (struct wbsd_host*)param;
1298         struct mmc_data* data;
1299
1300         spin_lock(&host->lock);
1301
1302         if ((wbsd_read_index(host, WBSD_IDX_CRCSTATUS) & WBSD_CRC_MASK) !=
1303                 WBSD_CRC_OK)
1304         {
1305                 data = wbsd_get_data(host);
1306                 if (!data)
1307                         goto end;
1308
1309                 DBGF("CRC error\n");
1310
1311                 data->error = MMC_ERR_BADCRC;
1312
1313                 tasklet_schedule(&host->finish_tasklet);
1314         }
1315
1316 end:
1317         spin_unlock(&host->lock);
1318 }
1319
1320 /*
1321  * Interrupt handling
1322  */
1323
1324 static irqreturn_t wbsd_irq(int irq, void *dev_id, struct pt_regs *regs)
1325 {
1326         struct wbsd_host* host = dev_id;
1327         int isr;
1328
1329         isr = inb(host->base + WBSD_ISR);
1330
1331         /*
1332          * Was it actually our hardware that caused the interrupt?
1333          */
1334         if (isr == 0xff || isr == 0x00)
1335                 return IRQ_NONE;
1336
1337         host->isr |= isr;
1338
1339         /*
1340          * Schedule tasklets as needed.
1341          */
1342         if (isr & WBSD_INT_CARD)
1343                 tasklet_schedule(&host->card_tasklet);
1344         if (isr & WBSD_INT_FIFO_THRE)
1345                 tasklet_schedule(&host->fifo_tasklet);
1346         if (isr & WBSD_INT_CRC)
1347                 tasklet_hi_schedule(&host->crc_tasklet);
1348         if (isr & WBSD_INT_TIMEOUT)
1349                 tasklet_hi_schedule(&host->timeout_tasklet);
1350         if (isr & WBSD_INT_BUSYEND)
1351                 tasklet_hi_schedule(&host->block_tasklet);
1352         if (isr & WBSD_INT_TC)
1353                 tasklet_schedule(&host->finish_tasklet);
1354
1355         return IRQ_HANDLED;
1356 }
1357
1358 /*****************************************************************************\
1359  *                                                                           *
1360  * Device initialisation and shutdown                                        *
1361  *                                                                           *
1362 \*****************************************************************************/
1363
1364 /*
1365  * Allocate/free MMC structure.
1366  */
1367
1368 static int __devinit wbsd_alloc_mmc(struct device* dev)
1369 {
1370         struct mmc_host* mmc;
1371         struct wbsd_host* host;
1372
1373         /*
1374          * Allocate MMC structure.
1375          */
1376         mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev);
1377         if (!mmc)
1378                 return -ENOMEM;
1379
1380         host = mmc_priv(mmc);
1381         host->mmc = mmc;
1382
1383         host->dma = -1;
1384
1385         /*
1386          * Set host parameters.
1387          */
1388         mmc->ops = &wbsd_ops;
1389         mmc->f_min = 375000;
1390         mmc->f_max = 24000000;
1391         mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34;
1392         mmc->caps = MMC_CAP_4_BIT_DATA;
1393
1394         spin_lock_init(&host->lock);
1395
1396         /*
1397          * Set up timers
1398          */
1399         init_timer(&host->ignore_timer);
1400         host->ignore_timer.data = (unsigned long)host;
1401         host->ignore_timer.function = wbsd_reset_ignore;
1402
1403         /*
1404          * Maximum number of segments. Worst case is one sector per segment
1405          * so this will be 64kB/512.
1406          */
1407         mmc->max_hw_segs = 128;
1408         mmc->max_phys_segs = 128;
1409
1410         /*
1411          * Maximum number of sectors in one transfer. Also limited by 64kB
1412          * buffer.
1413          */
1414         mmc->max_sectors = 128;
1415
1416         /*
1417          * Maximum segment size. Could be one segment with the maximum number
1418          * of segments.
1419          */
1420         mmc->max_seg_size = mmc->max_sectors * 512;
1421
1422         dev_set_drvdata(dev, mmc);
1423
1424         return 0;
1425 }
1426
1427 static void __devexit wbsd_free_mmc(struct device* dev)
1428 {
1429         struct mmc_host* mmc;
1430         struct wbsd_host* host;
1431
1432         mmc = dev_get_drvdata(dev);
1433         if (!mmc)
1434                 return;
1435
1436         host = mmc_priv(mmc);
1437         BUG_ON(host == NULL);
1438
1439         del_timer_sync(&host->ignore_timer);
1440
1441         mmc_free_host(mmc);
1442
1443         dev_set_drvdata(dev, NULL);
1444 }
1445
1446 /*
1447  * Scan for known chip id:s
1448  */
1449
1450 static int __devinit wbsd_scan(struct wbsd_host* host)
1451 {
1452         int i, j, k;
1453         int id;
1454
1455         /*
1456          * Iterate through all ports, all codes to
1457          * find hardware that is in our known list.
1458          */
1459         for (i = 0;i < sizeof(config_ports)/sizeof(int);i++)
1460         {
1461                 if (!request_region(config_ports[i], 2, DRIVER_NAME))
1462                         continue;
1463
1464                 for (j = 0;j < sizeof(unlock_codes)/sizeof(int);j++)
1465                 {
1466                         id = 0xFFFF;
1467
1468                         host->config = config_ports[i];
1469                         host->unlock_code = unlock_codes[j];
1470
1471                         wbsd_unlock_config(host);
1472
1473                         outb(WBSD_CONF_ID_HI, config_ports[i]);
1474                         id = inb(config_ports[i] + 1) << 8;
1475
1476                         outb(WBSD_CONF_ID_LO, config_ports[i]);
1477                         id |= inb(config_ports[i] + 1);
1478
1479                         wbsd_lock_config(host);
1480
1481                         for (k = 0;k < sizeof(valid_ids)/sizeof(int);k++)
1482                         {
1483                                 if (id == valid_ids[k])
1484                                 {
1485                                         host->chip_id = id;
1486
1487                                         return 0;
1488                                 }
1489                         }
1490
1491                         if (id != 0xFFFF)
1492                         {
1493                                 DBG("Unknown hardware (id %x) found at %x\n",
1494                                         id, config_ports[i]);
1495                         }
1496                 }
1497
1498                 release_region(config_ports[i], 2);
1499         }
1500
1501         host->config = 0;
1502         host->unlock_code = 0;
1503
1504         return -ENODEV;
1505 }
1506
1507 /*
1508  * Allocate/free io port ranges
1509  */
1510
1511 static int __devinit wbsd_request_region(struct wbsd_host* host, int base)
1512 {
1513         if (io & 0x7)
1514                 return -EINVAL;
1515
1516         if (!request_region(base, 8, DRIVER_NAME))
1517                 return -EIO;
1518
1519         host->base = io;
1520
1521         return 0;
1522 }
1523
1524 static void __devexit wbsd_release_regions(struct wbsd_host* host)
1525 {
1526         if (host->base)
1527                 release_region(host->base, 8);
1528
1529         host->base = 0;
1530
1531         if (host->config)
1532                 release_region(host->config, 2);
1533
1534         host->config = 0;
1535 }
1536
1537 /*
1538  * Allocate/free DMA port and buffer
1539  */
1540
1541 static void __devinit wbsd_request_dma(struct wbsd_host* host, int dma)
1542 {
1543         if (dma < 0)
1544                 return;
1545
1546         if (request_dma(dma, DRIVER_NAME))
1547                 goto err;
1548
1549         /*
1550          * We need to allocate a special buffer in
1551          * order for ISA to be able to DMA to it.
1552          */
1553         host->dma_buffer = kmalloc(WBSD_DMA_SIZE,
1554                 GFP_NOIO | GFP_DMA | __GFP_REPEAT | __GFP_NOWARN);
1555         if (!host->dma_buffer)
1556                 goto free;
1557
1558         /*
1559          * Translate the address to a physical address.
1560          */
1561         host->dma_addr = dma_map_single(host->mmc->dev, host->dma_buffer,
1562                 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1563
1564         /*
1565          * ISA DMA must be aligned on a 64k basis.
1566          */
1567         if ((host->dma_addr & 0xffff) != 0)
1568                 goto kfree;
1569         /*
1570          * ISA cannot access memory above 16 MB.
1571          */
1572         else if (host->dma_addr >= 0x1000000)
1573                 goto kfree;
1574
1575         host->dma = dma;
1576
1577         return;
1578
1579 kfree:
1580         /*
1581          * If we've gotten here then there is some kind of alignment bug
1582          */
1583         BUG_ON(1);
1584
1585         dma_unmap_single(host->mmc->dev, host->dma_addr, WBSD_DMA_SIZE,
1586                 DMA_BIDIRECTIONAL);
1587         host->dma_addr = (dma_addr_t)NULL;
1588
1589         kfree(host->dma_buffer);
1590         host->dma_buffer = NULL;
1591
1592 free:
1593         free_dma(dma);
1594
1595 err:
1596         printk(KERN_WARNING DRIVER_NAME ": Unable to allocate DMA %d. "
1597                 "Falling back on FIFO.\n", dma);
1598 }
1599
1600 static void __devexit wbsd_release_dma(struct wbsd_host* host)
1601 {
1602         if (host->dma_addr)
1603                 dma_unmap_single(host->mmc->dev, host->dma_addr, WBSD_DMA_SIZE,
1604                         DMA_BIDIRECTIONAL);
1605         if (host->dma_buffer)
1606                 kfree(host->dma_buffer);
1607         if (host->dma >= 0)
1608                 free_dma(host->dma);
1609
1610         host->dma = -1;
1611         host->dma_buffer = NULL;
1612         host->dma_addr = (dma_addr_t)NULL;
1613 }
1614
1615 /*
1616  * Allocate/free IRQ.
1617  */
1618
1619 static int __devinit wbsd_request_irq(struct wbsd_host* host, int irq)
1620 {
1621         int ret;
1622
1623         /*
1624          * Allocate interrupt.
1625          */
1626
1627         ret = request_irq(irq, wbsd_irq, SA_SHIRQ, DRIVER_NAME, host);
1628         if (ret)
1629                 return ret;
1630
1631         host->irq = irq;
1632
1633         /*
1634          * Set up tasklets.
1635          */
1636         tasklet_init(&host->card_tasklet, wbsd_tasklet_card, (unsigned long)host);
1637         tasklet_init(&host->fifo_tasklet, wbsd_tasklet_fifo, (unsigned long)host);
1638         tasklet_init(&host->crc_tasklet, wbsd_tasklet_crc, (unsigned long)host);
1639         tasklet_init(&host->timeout_tasklet, wbsd_tasklet_timeout, (unsigned long)host);
1640         tasklet_init(&host->finish_tasklet, wbsd_tasklet_finish, (unsigned long)host);
1641         tasklet_init(&host->block_tasklet, wbsd_tasklet_block, (unsigned long)host);
1642
1643         return 0;
1644 }
1645
1646 static void __devexit wbsd_release_irq(struct wbsd_host* host)
1647 {
1648         if (!host->irq)
1649                 return;
1650
1651         free_irq(host->irq, host);
1652
1653         host->irq = 0;
1654
1655         tasklet_kill(&host->card_tasklet);
1656         tasklet_kill(&host->fifo_tasklet);
1657         tasklet_kill(&host->crc_tasklet);
1658         tasklet_kill(&host->timeout_tasklet);
1659         tasklet_kill(&host->finish_tasklet);
1660         tasklet_kill(&host->block_tasklet);
1661 }
1662
1663 /*
1664  * Allocate all resources for the host.
1665  */
1666
1667 static int __devinit wbsd_request_resources(struct wbsd_host* host,
1668         int base, int irq, int dma)
1669 {
1670         int ret;
1671
1672         /*
1673          * Allocate I/O ports.
1674          */
1675         ret = wbsd_request_region(host, base);
1676         if (ret)
1677                 return ret;
1678
1679         /*
1680          * Allocate interrupt.
1681          */
1682         ret = wbsd_request_irq(host, irq);
1683         if (ret)
1684                 return ret;
1685
1686         /*
1687          * Allocate DMA.
1688          */
1689         wbsd_request_dma(host, dma);
1690
1691         return 0;
1692 }
1693
1694 /*
1695  * Release all resources for the host.
1696  */
1697
1698 static void __devexit wbsd_release_resources(struct wbsd_host* host)
1699 {
1700         wbsd_release_dma(host);
1701         wbsd_release_irq(host);
1702         wbsd_release_regions(host);
1703 }
1704
1705 /*
1706  * Configure the resources the chip should use.
1707  */
1708
1709 static void wbsd_chip_config(struct wbsd_host* host)
1710 {
1711         wbsd_unlock_config(host);
1712
1713         /*
1714          * Reset the chip.
1715          */
1716         wbsd_write_config(host, WBSD_CONF_SWRST, 1);
1717         wbsd_write_config(host, WBSD_CONF_SWRST, 0);
1718
1719         /*
1720          * Select SD/MMC function.
1721          */
1722         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1723
1724         /*
1725          * Set up card detection.
1726          */
1727         wbsd_write_config(host, WBSD_CONF_PINS, WBSD_PINS_DETECT_GP11);
1728
1729         /*
1730          * Configure chip
1731          */
1732         wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8);
1733         wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff);
1734
1735         wbsd_write_config(host, WBSD_CONF_IRQ, host->irq);
1736
1737         if (host->dma >= 0)
1738                 wbsd_write_config(host, WBSD_CONF_DRQ, host->dma);
1739
1740         /*
1741          * Enable and power up chip.
1742          */
1743         wbsd_write_config(host, WBSD_CONF_ENABLE, 1);
1744         wbsd_write_config(host, WBSD_CONF_POWER, 0x20);
1745
1746         wbsd_lock_config(host);
1747 }
1748
1749 /*
1750  * Check that configured resources are correct.
1751  */
1752
1753 static int wbsd_chip_validate(struct wbsd_host* host)
1754 {
1755         int base, irq, dma;
1756
1757         wbsd_unlock_config(host);
1758
1759         /*
1760          * Select SD/MMC function.
1761          */
1762         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1763
1764         /*
1765          * Read configuration.
1766          */
1767         base = wbsd_read_config(host, WBSD_CONF_PORT_HI) << 8;
1768         base |= wbsd_read_config(host, WBSD_CONF_PORT_LO);
1769
1770         irq = wbsd_read_config(host, WBSD_CONF_IRQ);
1771
1772         dma = wbsd_read_config(host, WBSD_CONF_DRQ);
1773
1774         wbsd_lock_config(host);
1775
1776         /*
1777          * Validate against given configuration.
1778          */
1779         if (base != host->base)
1780                 return 0;
1781         if (irq != host->irq)
1782                 return 0;
1783         if ((dma != host->dma) && (host->dma != -1))
1784                 return 0;
1785
1786         return 1;
1787 }
1788
1789 /*
1790  * Powers down the SD function
1791  */
1792
1793 static void wbsd_chip_poweroff(struct wbsd_host* host)
1794 {
1795         wbsd_unlock_config(host);
1796
1797         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1798         wbsd_write_config(host, WBSD_CONF_ENABLE, 0);
1799
1800         wbsd_lock_config(host);
1801 }
1802
1803 /*****************************************************************************\
1804  *                                                                           *
1805  * Devices setup and shutdown                                                *
1806  *                                                                           *
1807 \*****************************************************************************/
1808
1809 static int __devinit wbsd_init(struct device* dev, int base, int irq, int dma,
1810         int pnp)
1811 {
1812         struct wbsd_host* host = NULL;
1813         struct mmc_host* mmc = NULL;
1814         int ret;
1815
1816         ret = wbsd_alloc_mmc(dev);
1817         if (ret)
1818                 return ret;
1819
1820         mmc = dev_get_drvdata(dev);
1821         host = mmc_priv(mmc);
1822
1823         /*
1824          * Scan for hardware.
1825          */
1826         ret = wbsd_scan(host);
1827         if (ret)
1828         {
1829                 if (pnp && (ret == -ENODEV))
1830                 {
1831                         printk(KERN_WARNING DRIVER_NAME
1832                                 ": Unable to confirm device presence. You may "
1833                                 "experience lock-ups.\n");
1834                 }
1835                 else
1836                 {
1837                         wbsd_free_mmc(dev);
1838                         return ret;
1839                 }
1840         }
1841
1842         /*
1843          * Request resources.
1844          */
1845         ret = wbsd_request_resources(host, io, irq, dma);
1846         if (ret)
1847         {
1848                 wbsd_release_resources(host);
1849                 wbsd_free_mmc(dev);
1850                 return ret;
1851         }
1852
1853         /*
1854          * See if chip needs to be configured.
1855          */
1856         if (pnp)
1857         {
1858                 if ((host->config != 0) && !wbsd_chip_validate(host))
1859                 {
1860                         printk(KERN_WARNING DRIVER_NAME
1861                                 ": PnP active but chip not configured! "
1862                                 "You probably have a buggy BIOS. "
1863                                 "Configuring chip manually.\n");
1864                         wbsd_chip_config(host);
1865                 }
1866         }
1867         else
1868                 wbsd_chip_config(host);
1869
1870         /*
1871          * Power Management stuff. No idea how this works.
1872          * Not tested.
1873          */
1874 #ifdef CONFIG_PM
1875         if (host->config)
1876         {
1877                 wbsd_unlock_config(host);
1878                 wbsd_write_config(host, WBSD_CONF_PME, 0xA0);
1879                 wbsd_lock_config(host);
1880         }
1881 #endif
1882         /*
1883          * Allow device to initialise itself properly.
1884          */
1885         mdelay(5);
1886
1887         /*
1888          * Reset the chip into a known state.
1889          */
1890         wbsd_init_device(host);
1891
1892         mmc_add_host(mmc);
1893
1894         printk(KERN_INFO "%s: W83L51xD", mmc_hostname(mmc));
1895         if (host->chip_id != 0)
1896                 printk(" id %x", (int)host->chip_id);
1897         printk(" at 0x%x irq %d", (int)host->base, (int)host->irq);
1898         if (host->dma >= 0)
1899                 printk(" dma %d", (int)host->dma);
1900         else
1901                 printk(" FIFO");
1902         if (pnp)
1903                 printk(" PnP");
1904         printk("\n");
1905
1906         return 0;
1907 }
1908
1909 static void __devexit wbsd_shutdown(struct device* dev, int pnp)
1910 {
1911         struct mmc_host* mmc = dev_get_drvdata(dev);
1912         struct wbsd_host* host;
1913
1914         if (!mmc)
1915                 return;
1916
1917         host = mmc_priv(mmc);
1918
1919         mmc_remove_host(mmc);
1920
1921         /*
1922          * Power down the SD/MMC function.
1923          */
1924         if (!pnp)
1925                 wbsd_chip_poweroff(host);
1926
1927         wbsd_release_resources(host);
1928
1929         wbsd_free_mmc(dev);
1930 }
1931
1932 /*
1933  * Non-PnP
1934  */
1935
1936 static int __devinit wbsd_probe(struct device* dev)
1937 {
1938         return wbsd_init(dev, io, irq, dma, 0);
1939 }
1940
1941 static int __devexit wbsd_remove(struct device* dev)
1942 {
1943         wbsd_shutdown(dev, 0);
1944
1945         return 0;
1946 }
1947
1948 /*
1949  * PnP
1950  */
1951
1952 #ifdef CONFIG_PNP
1953
1954 static int __devinit
1955 wbsd_pnp_probe(struct pnp_dev * pnpdev, const struct pnp_device_id *dev_id)
1956 {
1957         int io, irq, dma;
1958
1959         /*
1960          * Get resources from PnP layer.
1961          */
1962         io = pnp_port_start(pnpdev, 0);
1963         irq = pnp_irq(pnpdev, 0);
1964         if (pnp_dma_valid(pnpdev, 0))
1965                 dma = pnp_dma(pnpdev, 0);
1966         else
1967                 dma = -1;
1968
1969         DBGF("PnP resources: port %3x irq %d dma %d\n", io, irq, dma);
1970
1971         return wbsd_init(&pnpdev->dev, io, irq, dma, 1);
1972 }
1973
1974 static void __devexit wbsd_pnp_remove(struct pnp_dev * dev)
1975 {
1976         wbsd_shutdown(&dev->dev, 1);
1977 }
1978
1979 #endif /* CONFIG_PNP */
1980
1981 /*
1982  * Power management
1983  */
1984
1985 #ifdef CONFIG_PM
1986
1987 static int wbsd_suspend(struct device *dev, pm_message_t state)
1988 {
1989         struct mmc_host *mmc = dev_get_drvdata(dev);
1990         struct wbsd_host *host;
1991         int ret;
1992
1993         if (!mmc)
1994                 return 0;
1995
1996         DBG("Suspending...\n");
1997
1998         ret = mmc_suspend_host(mmc, state);
1999         if (!ret)
2000                 return ret;
2001
2002         host = mmc_priv(mmc);
2003
2004         wbsd_chip_poweroff(host);
2005
2006         return 0;
2007 }
2008
2009 static int wbsd_resume(struct device *dev)
2010 {
2011         struct mmc_host *mmc = dev_get_drvdata(dev);
2012         struct wbsd_host *host;
2013
2014         if (!mmc)
2015                 return 0;
2016
2017         DBG("Resuming...\n");
2018
2019         host = mmc_priv(mmc);
2020
2021         wbsd_chip_config(host);
2022
2023         /*
2024          * Allow device to initialise itself properly.
2025          */
2026         mdelay(5);
2027
2028         wbsd_init_device(host);
2029
2030         return mmc_resume_host(mmc);
2031 }
2032
2033 #else /* CONFIG_PM */
2034
2035 #define wbsd_suspend NULL
2036 #define wbsd_resume NULL
2037
2038 #endif /* CONFIG_PM */
2039
2040 static struct platform_device *wbsd_device;
2041
2042 static struct device_driver wbsd_driver = {
2043         .name           = DRIVER_NAME,
2044         .bus            = &platform_bus_type,
2045         .probe          = wbsd_probe,
2046         .remove         = wbsd_remove,
2047
2048         .suspend        = wbsd_suspend,
2049         .resume         = wbsd_resume,
2050 };
2051
2052 #ifdef CONFIG_PNP
2053
2054 static struct pnp_driver wbsd_pnp_driver = {
2055         .name           = DRIVER_NAME,
2056         .id_table       = pnp_dev_table,
2057         .probe          = wbsd_pnp_probe,
2058         .remove         = wbsd_pnp_remove,
2059 };
2060
2061 #endif /* CONFIG_PNP */
2062
2063 /*
2064  * Module loading/unloading
2065  */
2066
2067 static int __init wbsd_drv_init(void)
2068 {
2069         int result;
2070
2071         printk(KERN_INFO DRIVER_NAME
2072                 ": Winbond W83L51xD SD/MMC card interface driver, "
2073                 DRIVER_VERSION "\n");
2074         printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
2075
2076 #ifdef CONFIG_PNP
2077
2078         if (!nopnp)
2079         {
2080                 result = pnp_register_driver(&wbsd_pnp_driver);
2081                 if (result < 0)
2082                         return result;
2083         }
2084
2085 #endif /* CONFIG_PNP */
2086
2087         if (nopnp)
2088         {
2089                 result = driver_register(&wbsd_driver);
2090                 if (result < 0)
2091                         return result;
2092
2093                 wbsd_device = platform_device_register_simple(DRIVER_NAME, -1,
2094                         NULL, 0);
2095                 if (IS_ERR(wbsd_device))
2096                         return PTR_ERR(wbsd_device);
2097         }
2098
2099         return 0;
2100 }
2101
2102 static void __exit wbsd_drv_exit(void)
2103 {
2104 #ifdef CONFIG_PNP
2105
2106         if (!nopnp)
2107                 pnp_unregister_driver(&wbsd_pnp_driver);
2108
2109 #endif /* CONFIG_PNP */
2110
2111         if (nopnp)
2112         {
2113                 platform_device_unregister(wbsd_device);
2114
2115                 driver_unregister(&wbsd_driver);
2116         }
2117
2118         DBG("unloaded\n");
2119 }
2120
2121 module_init(wbsd_drv_init);
2122 module_exit(wbsd_drv_exit);
2123 #ifdef CONFIG_PNP
2124 module_param(nopnp, uint, 0444);
2125 #endif
2126 module_param(io, uint, 0444);
2127 module_param(irq, uint, 0444);
2128 module_param(dma, int, 0444);
2129
2130 MODULE_LICENSE("GPL");
2131 MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver");
2132 MODULE_VERSION(DRIVER_VERSION);
2133
2134 #ifdef CONFIG_PNP
2135 MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)");
2136 #endif
2137 MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)");
2138 MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)");
2139 MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)");