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/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 DRIVER_NAME ": Resetting chip\n");
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 DRIVER_NAME ": Incomplete DMA "
884                                 "transfer. %d bytes left.\n", count);
885
886                         data->error = MMC_ERR_FAILED;
887                 }
888                 else
889                 {
890                         /*
891                          * Transfer data from DMA buffer to
892                          * SG list.
893                          */
894                         if (data->flags & MMC_DATA_READ)
895                                 wbsd_dma_to_sg(host, data);
896
897                         data->bytes_xfered = host->size;
898                 }
899         }
900
901         DBGF("Ending data transfer (%d bytes)\n", data->bytes_xfered);
902
903         wbsd_request_end(host, host->mrq);
904 }
905
906 /*****************************************************************************\
907  *                                                                           *
908  * MMC layer callbacks                                                       *
909  *                                                                           *
910 \*****************************************************************************/
911
912 static void wbsd_request(struct mmc_host* mmc, struct mmc_request* mrq)
913 {
914         struct wbsd_host* host = mmc_priv(mmc);
915         struct mmc_command* cmd;
916
917         /*
918          * Disable tasklets to avoid a deadlock.
919          */
920         spin_lock_bh(&host->lock);
921
922         BUG_ON(host->mrq != NULL);
923
924         cmd = mrq->cmd;
925
926         host->mrq = mrq;
927
928         /*
929          * If there is no card in the slot then
930          * timeout immediatly.
931          */
932         if (!(host->flags & WBSD_FCARD_PRESENT))
933         {
934                 cmd->error = MMC_ERR_TIMEOUT;
935                 goto done;
936         }
937
938         /*
939          * Does the request include data?
940          */
941         if (cmd->data)
942         {
943                 wbsd_prepare_data(host, cmd->data);
944
945                 if (cmd->data->error != MMC_ERR_NONE)
946                         goto done;
947         }
948
949         wbsd_send_command(host, cmd);
950
951         /*
952          * If this is a data transfer the request
953          * will be finished after the data has
954          * transfered.
955          */
956         if (cmd->data && (cmd->error == MMC_ERR_NONE))
957         {
958                 /*
959                  * Dirty fix for hardware bug.
960                  */
961                 if (host->dma == -1)
962                         tasklet_schedule(&host->fifo_tasklet);
963
964                 spin_unlock_bh(&host->lock);
965
966                 return;
967         }
968
969 done:
970         wbsd_request_end(host, mrq);
971
972         spin_unlock_bh(&host->lock);
973 }
974
975 static void wbsd_set_ios(struct mmc_host* mmc, struct mmc_ios* ios)
976 {
977         struct wbsd_host* host = mmc_priv(mmc);
978         u8 clk, setup, pwr;
979
980         DBGF("clock %uHz busmode %u powermode %u cs %u Vdd %u width %u\n",
981              ios->clock, ios->bus_mode, ios->power_mode, ios->chip_select,
982              ios->vdd, ios->bus_width);
983
984         spin_lock_bh(&host->lock);
985
986         /*
987          * Reset the chip on each power off.
988          * Should clear out any weird states.
989          */
990         if (ios->power_mode == MMC_POWER_OFF)
991                 wbsd_init_device(host);
992
993         if (ios->clock >= 24000000)
994                 clk = WBSD_CLK_24M;
995         else if (ios->clock >= 16000000)
996                 clk = WBSD_CLK_16M;
997         else if (ios->clock >= 12000000)
998                 clk = WBSD_CLK_12M;
999         else
1000                 clk = WBSD_CLK_375K;
1001
1002         /*
1003          * Only write to the clock register when
1004          * there is an actual change.
1005          */
1006         if (clk != host->clk)
1007         {
1008                 wbsd_write_index(host, WBSD_IDX_CLK, clk);
1009                 host->clk = clk;
1010         }
1011
1012         /*
1013          * Power up card.
1014          */
1015         if (ios->power_mode != MMC_POWER_OFF)
1016         {
1017                 pwr = inb(host->base + WBSD_CSR);
1018                 pwr &= ~WBSD_POWER_N;
1019                 outb(pwr, host->base + WBSD_CSR);
1020         }
1021
1022         /*
1023          * MMC cards need to have pin 1 high during init.
1024          * It wreaks havoc with the card detection though so
1025          * that needs to be disabled.
1026          */
1027         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
1028         if (ios->chip_select == MMC_CS_HIGH)
1029         {
1030                 BUG_ON(ios->bus_width != MMC_BUS_WIDTH_1);
1031                 setup |= WBSD_DAT3_H;
1032                 host->flags |= WBSD_FIGNORE_DETECT;
1033         }
1034         else
1035         {
1036                 if (setup & WBSD_DAT3_H)
1037                 {
1038                         setup &= ~WBSD_DAT3_H;
1039
1040                         /*
1041                          * We cannot resume card detection immediatly
1042                          * because of capacitance and delays in the chip.
1043                          */
1044                         mod_timer(&host->ignore_timer, jiffies + HZ/100);
1045                 }
1046         }
1047         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
1048
1049         /*
1050          * Store bus width for later. Will be used when
1051          * setting up the data transfer.
1052          */
1053         host->bus_width = ios->bus_width;
1054
1055         spin_unlock_bh(&host->lock);
1056 }
1057
1058 static int wbsd_get_ro(struct mmc_host* mmc)
1059 {
1060         struct wbsd_host* host = mmc_priv(mmc);
1061         u8 csr;
1062
1063         spin_lock_bh(&host->lock);
1064
1065         csr = inb(host->base + WBSD_CSR);
1066         csr |= WBSD_MSLED;
1067         outb(csr, host->base + WBSD_CSR);
1068
1069         mdelay(1);
1070
1071         csr = inb(host->base + WBSD_CSR);
1072         csr &= ~WBSD_MSLED;
1073         outb(csr, host->base + WBSD_CSR);
1074
1075         spin_unlock_bh(&host->lock);
1076
1077         return csr & WBSD_WRPT;
1078 }
1079
1080 static struct mmc_host_ops wbsd_ops = {
1081         .request        = wbsd_request,
1082         .set_ios        = wbsd_set_ios,
1083         .get_ro         = wbsd_get_ro,
1084 };
1085
1086 /*****************************************************************************\
1087  *                                                                           *
1088  * Interrupt handling                                                        *
1089  *                                                                           *
1090 \*****************************************************************************/
1091
1092 /*
1093  * Helper function to reset detection ignore
1094  */
1095
1096 static void wbsd_reset_ignore(unsigned long data)
1097 {
1098         struct wbsd_host *host = (struct wbsd_host*)data;
1099
1100         BUG_ON(host == NULL);
1101
1102         DBG("Resetting card detection ignore\n");
1103
1104         spin_lock_bh(&host->lock);
1105
1106         host->flags &= ~WBSD_FIGNORE_DETECT;
1107
1108         /*
1109          * Card status might have changed during the
1110          * blackout.
1111          */
1112         tasklet_schedule(&host->card_tasklet);
1113
1114         spin_unlock_bh(&host->lock);
1115 }
1116
1117 /*
1118  * Tasklets
1119  */
1120
1121 static inline struct mmc_data* wbsd_get_data(struct wbsd_host* host)
1122 {
1123         WARN_ON(!host->mrq);
1124         if (!host->mrq)
1125                 return NULL;
1126
1127         WARN_ON(!host->mrq->cmd);
1128         if (!host->mrq->cmd)
1129                 return NULL;
1130
1131         WARN_ON(!host->mrq->cmd->data);
1132         if (!host->mrq->cmd->data)
1133                 return NULL;
1134
1135         return host->mrq->cmd->data;
1136 }
1137
1138 static void wbsd_tasklet_card(unsigned long param)
1139 {
1140         struct wbsd_host* host = (struct wbsd_host*)param;
1141         u8 csr;
1142         int delay = -1;
1143
1144         spin_lock(&host->lock);
1145
1146         if (host->flags & WBSD_FIGNORE_DETECT)
1147         {
1148                 spin_unlock(&host->lock);
1149                 return;
1150         }
1151
1152         csr = inb(host->base + WBSD_CSR);
1153         WARN_ON(csr == 0xff);
1154
1155         if (csr & WBSD_CARDPRESENT)
1156         {
1157                 if (!(host->flags & WBSD_FCARD_PRESENT))
1158                 {
1159                         DBG("Card inserted\n");
1160                         host->flags |= WBSD_FCARD_PRESENT;
1161
1162                         delay = 500;
1163                 }
1164         }
1165         else if (host->flags & WBSD_FCARD_PRESENT)
1166         {
1167                 DBG("Card removed\n");
1168                 host->flags &= ~WBSD_FCARD_PRESENT;
1169
1170                 if (host->mrq)
1171                 {
1172                         printk(KERN_ERR DRIVER_NAME
1173                                 ": Card removed during transfer!\n");
1174                         wbsd_reset(host);
1175
1176                         host->mrq->cmd->error = MMC_ERR_FAILED;
1177                         tasklet_schedule(&host->finish_tasklet);
1178                 }
1179
1180                 delay = 0;
1181         }
1182
1183         /*
1184          * Unlock first since we might get a call back.
1185          */
1186
1187         spin_unlock(&host->lock);
1188
1189         if (delay != -1)
1190                 mmc_detect_change(host->mmc, msecs_to_jiffies(delay));
1191 }
1192
1193 static void wbsd_tasklet_fifo(unsigned long param)
1194 {
1195         struct wbsd_host* host = (struct wbsd_host*)param;
1196         struct mmc_data* data;
1197
1198         spin_lock(&host->lock);
1199
1200         if (!host->mrq)
1201                 goto end;
1202
1203         data = wbsd_get_data(host);
1204         if (!data)
1205                 goto end;
1206
1207         if (data->flags & MMC_DATA_WRITE)
1208                 wbsd_fill_fifo(host);
1209         else
1210                 wbsd_empty_fifo(host);
1211
1212         /*
1213          * Done?
1214          */
1215         if (host->size == data->bytes_xfered)
1216         {
1217                 wbsd_write_index(host, WBSD_IDX_FIFOEN, 0);
1218                 tasklet_schedule(&host->finish_tasklet);
1219         }
1220
1221 end:
1222         spin_unlock(&host->lock);
1223 }
1224
1225 static void wbsd_tasklet_crc(unsigned long param)
1226 {
1227         struct wbsd_host* host = (struct wbsd_host*)param;
1228         struct mmc_data* data;
1229
1230         spin_lock(&host->lock);
1231
1232         if (!host->mrq)
1233                 goto end;
1234
1235         data = wbsd_get_data(host);
1236         if (!data)
1237                 goto end;
1238
1239         DBGF("CRC error\n");
1240
1241         data->error = MMC_ERR_BADCRC;
1242
1243         tasklet_schedule(&host->finish_tasklet);
1244
1245 end:
1246         spin_unlock(&host->lock);
1247 }
1248
1249 static void wbsd_tasklet_timeout(unsigned long param)
1250 {
1251         struct wbsd_host* host = (struct wbsd_host*)param;
1252         struct mmc_data* data;
1253
1254         spin_lock(&host->lock);
1255
1256         if (!host->mrq)
1257                 goto end;
1258
1259         data = wbsd_get_data(host);
1260         if (!data)
1261                 goto end;
1262
1263         DBGF("Timeout\n");
1264
1265         data->error = MMC_ERR_TIMEOUT;
1266
1267         tasklet_schedule(&host->finish_tasklet);
1268
1269 end:
1270         spin_unlock(&host->lock);
1271 }
1272
1273 static void wbsd_tasklet_finish(unsigned long param)
1274 {
1275         struct wbsd_host* host = (struct wbsd_host*)param;
1276         struct mmc_data* data;
1277
1278         spin_lock(&host->lock);
1279
1280         WARN_ON(!host->mrq);
1281         if (!host->mrq)
1282                 goto end;
1283
1284         data = wbsd_get_data(host);
1285         if (!data)
1286                 goto end;
1287
1288         wbsd_finish_data(host, data);
1289
1290 end:
1291         spin_unlock(&host->lock);
1292 }
1293
1294 static void wbsd_tasklet_block(unsigned long param)
1295 {
1296         struct wbsd_host* host = (struct wbsd_host*)param;
1297         struct mmc_data* data;
1298
1299         spin_lock(&host->lock);
1300
1301         if ((wbsd_read_index(host, WBSD_IDX_CRCSTATUS) & WBSD_CRC_MASK) !=
1302                 WBSD_CRC_OK)
1303         {
1304                 data = wbsd_get_data(host);
1305                 if (!data)
1306                         goto end;
1307
1308                 DBGF("CRC error\n");
1309
1310                 data->error = MMC_ERR_BADCRC;
1311
1312                 tasklet_schedule(&host->finish_tasklet);
1313         }
1314
1315 end:
1316         spin_unlock(&host->lock);
1317 }
1318
1319 /*
1320  * Interrupt handling
1321  */
1322
1323 static irqreturn_t wbsd_irq(int irq, void *dev_id, struct pt_regs *regs)
1324 {
1325         struct wbsd_host* host = dev_id;
1326         int isr;
1327
1328         isr = inb(host->base + WBSD_ISR);
1329
1330         /*
1331          * Was it actually our hardware that caused the interrupt?
1332          */
1333         if (isr == 0xff || isr == 0x00)
1334                 return IRQ_NONE;
1335
1336         host->isr |= isr;
1337
1338         /*
1339          * Schedule tasklets as needed.
1340          */
1341         if (isr & WBSD_INT_CARD)
1342                 tasklet_schedule(&host->card_tasklet);
1343         if (isr & WBSD_INT_FIFO_THRE)
1344                 tasklet_schedule(&host->fifo_tasklet);
1345         if (isr & WBSD_INT_CRC)
1346                 tasklet_hi_schedule(&host->crc_tasklet);
1347         if (isr & WBSD_INT_TIMEOUT)
1348                 tasklet_hi_schedule(&host->timeout_tasklet);
1349         if (isr & WBSD_INT_BUSYEND)
1350                 tasklet_hi_schedule(&host->block_tasklet);
1351         if (isr & WBSD_INT_TC)
1352                 tasklet_schedule(&host->finish_tasklet);
1353
1354         return IRQ_HANDLED;
1355 }
1356
1357 /*****************************************************************************\
1358  *                                                                           *
1359  * Device initialisation and shutdown                                        *
1360  *                                                                           *
1361 \*****************************************************************************/
1362
1363 /*
1364  * Allocate/free MMC structure.
1365  */
1366
1367 static int __devinit wbsd_alloc_mmc(struct device* dev)
1368 {
1369         struct mmc_host* mmc;
1370         struct wbsd_host* host;
1371
1372         /*
1373          * Allocate MMC structure.
1374          */
1375         mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev);
1376         if (!mmc)
1377                 return -ENOMEM;
1378
1379         host = mmc_priv(mmc);
1380         host->mmc = mmc;
1381
1382         host->dma = -1;
1383
1384         /*
1385          * Set host parameters.
1386          */
1387         mmc->ops = &wbsd_ops;
1388         mmc->f_min = 375000;
1389         mmc->f_max = 24000000;
1390         mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34;
1391         mmc->caps = MMC_CAP_4_BIT_DATA;
1392
1393         spin_lock_init(&host->lock);
1394
1395         /*
1396          * Set up timers
1397          */
1398         init_timer(&host->ignore_timer);
1399         host->ignore_timer.data = (unsigned long)host;
1400         host->ignore_timer.function = wbsd_reset_ignore;
1401
1402         /*
1403          * Maximum number of segments. Worst case is one sector per segment
1404          * so this will be 64kB/512.
1405          */
1406         mmc->max_hw_segs = 128;
1407         mmc->max_phys_segs = 128;
1408
1409         /*
1410          * Maximum number of sectors in one transfer. Also limited by 64kB
1411          * buffer.
1412          */
1413         mmc->max_sectors = 128;
1414
1415         /*
1416          * Maximum segment size. Could be one segment with the maximum number
1417          * of segments.
1418          */
1419         mmc->max_seg_size = mmc->max_sectors * 512;
1420
1421         dev_set_drvdata(dev, mmc);
1422
1423         return 0;
1424 }
1425
1426 static void __devexit wbsd_free_mmc(struct device* dev)
1427 {
1428         struct mmc_host* mmc;
1429         struct wbsd_host* host;
1430
1431         mmc = dev_get_drvdata(dev);
1432         if (!mmc)
1433                 return;
1434
1435         host = mmc_priv(mmc);
1436         BUG_ON(host == NULL);
1437
1438         del_timer_sync(&host->ignore_timer);
1439
1440         mmc_free_host(mmc);
1441
1442         dev_set_drvdata(dev, NULL);
1443 }
1444
1445 /*
1446  * Scan for known chip id:s
1447  */
1448
1449 static int __devinit wbsd_scan(struct wbsd_host* host)
1450 {
1451         int i, j, k;
1452         int id;
1453
1454         /*
1455          * Iterate through all ports, all codes to
1456          * find hardware that is in our known list.
1457          */
1458         for (i = 0;i < sizeof(config_ports)/sizeof(int);i++)
1459         {
1460                 if (!request_region(config_ports[i], 2, DRIVER_NAME))
1461                         continue;
1462
1463                 for (j = 0;j < sizeof(unlock_codes)/sizeof(int);j++)
1464                 {
1465                         id = 0xFFFF;
1466
1467                         host->config = config_ports[i];
1468                         host->unlock_code = unlock_codes[j];
1469
1470                         wbsd_unlock_config(host);
1471
1472                         outb(WBSD_CONF_ID_HI, config_ports[i]);
1473                         id = inb(config_ports[i] + 1) << 8;
1474
1475                         outb(WBSD_CONF_ID_LO, config_ports[i]);
1476                         id |= inb(config_ports[i] + 1);
1477
1478                         wbsd_lock_config(host);
1479
1480                         for (k = 0;k < sizeof(valid_ids)/sizeof(int);k++)
1481                         {
1482                                 if (id == valid_ids[k])
1483                                 {
1484                                         host->chip_id = id;
1485
1486                                         return 0;
1487                                 }
1488                         }
1489
1490                         if (id != 0xFFFF)
1491                         {
1492                                 DBG("Unknown hardware (id %x) found at %x\n",
1493                                         id, config_ports[i]);
1494                         }
1495                 }
1496
1497                 release_region(config_ports[i], 2);
1498         }
1499
1500         host->config = 0;
1501         host->unlock_code = 0;
1502
1503         return -ENODEV;
1504 }
1505
1506 /*
1507  * Allocate/free io port ranges
1508  */
1509
1510 static int __devinit wbsd_request_region(struct wbsd_host* host, int base)
1511 {
1512         if (io & 0x7)
1513                 return -EINVAL;
1514
1515         if (!request_region(base, 8, DRIVER_NAME))
1516                 return -EIO;
1517
1518         host->base = io;
1519
1520         return 0;
1521 }
1522
1523 static void __devexit wbsd_release_regions(struct wbsd_host* host)
1524 {
1525         if (host->base)
1526                 release_region(host->base, 8);
1527
1528         host->base = 0;
1529
1530         if (host->config)
1531                 release_region(host->config, 2);
1532
1533         host->config = 0;
1534 }
1535
1536 /*
1537  * Allocate/free DMA port and buffer
1538  */
1539
1540 static void __devinit wbsd_request_dma(struct wbsd_host* host, int dma)
1541 {
1542         if (dma < 0)
1543                 return;
1544
1545         if (request_dma(dma, DRIVER_NAME))
1546                 goto err;
1547
1548         /*
1549          * We need to allocate a special buffer in
1550          * order for ISA to be able to DMA to it.
1551          */
1552         host->dma_buffer = kmalloc(WBSD_DMA_SIZE,
1553                 GFP_NOIO | GFP_DMA | __GFP_REPEAT | __GFP_NOWARN);
1554         if (!host->dma_buffer)
1555                 goto free;
1556
1557         /*
1558          * Translate the address to a physical address.
1559          */
1560         host->dma_addr = dma_map_single(host->mmc->dev, host->dma_buffer,
1561                 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1562
1563         /*
1564          * ISA DMA must be aligned on a 64k basis.
1565          */
1566         if ((host->dma_addr & 0xffff) != 0)
1567                 goto kfree;
1568         /*
1569          * ISA cannot access memory above 16 MB.
1570          */
1571         else if (host->dma_addr >= 0x1000000)
1572                 goto kfree;
1573
1574         host->dma = dma;
1575
1576         return;
1577
1578 kfree:
1579         /*
1580          * If we've gotten here then there is some kind of alignment bug
1581          */
1582         BUG_ON(1);
1583
1584         dma_unmap_single(host->mmc->dev, host->dma_addr, WBSD_DMA_SIZE,
1585                 DMA_BIDIRECTIONAL);
1586         host->dma_addr = (dma_addr_t)NULL;
1587
1588         kfree(host->dma_buffer);
1589         host->dma_buffer = NULL;
1590
1591 free:
1592         free_dma(dma);
1593
1594 err:
1595         printk(KERN_WARNING DRIVER_NAME ": Unable to allocate DMA %d. "
1596                 "Falling back on FIFO.\n", dma);
1597 }
1598
1599 static void __devexit wbsd_release_dma(struct wbsd_host* host)
1600 {
1601         if (host->dma_addr)
1602                 dma_unmap_single(host->mmc->dev, host->dma_addr, WBSD_DMA_SIZE,
1603                         DMA_BIDIRECTIONAL);
1604         if (host->dma_buffer)
1605                 kfree(host->dma_buffer);
1606         if (host->dma >= 0)
1607                 free_dma(host->dma);
1608
1609         host->dma = -1;
1610         host->dma_buffer = NULL;
1611         host->dma_addr = (dma_addr_t)NULL;
1612 }
1613
1614 /*
1615  * Allocate/free IRQ.
1616  */
1617
1618 static int __devinit wbsd_request_irq(struct wbsd_host* host, int irq)
1619 {
1620         int ret;
1621
1622         /*
1623          * Allocate interrupt.
1624          */
1625
1626         ret = request_irq(irq, wbsd_irq, SA_SHIRQ, DRIVER_NAME, host);
1627         if (ret)
1628                 return ret;
1629
1630         host->irq = irq;
1631
1632         /*
1633          * Set up tasklets.
1634          */
1635         tasklet_init(&host->card_tasklet, wbsd_tasklet_card, (unsigned long)host);
1636         tasklet_init(&host->fifo_tasklet, wbsd_tasklet_fifo, (unsigned long)host);
1637         tasklet_init(&host->crc_tasklet, wbsd_tasklet_crc, (unsigned long)host);
1638         tasklet_init(&host->timeout_tasklet, wbsd_tasklet_timeout, (unsigned long)host);
1639         tasklet_init(&host->finish_tasklet, wbsd_tasklet_finish, (unsigned long)host);
1640         tasklet_init(&host->block_tasklet, wbsd_tasklet_block, (unsigned long)host);
1641
1642         return 0;
1643 }
1644
1645 static void __devexit wbsd_release_irq(struct wbsd_host* host)
1646 {
1647         if (!host->irq)
1648                 return;
1649
1650         free_irq(host->irq, host);
1651
1652         host->irq = 0;
1653
1654         tasklet_kill(&host->card_tasklet);
1655         tasklet_kill(&host->fifo_tasklet);
1656         tasklet_kill(&host->crc_tasklet);
1657         tasklet_kill(&host->timeout_tasklet);
1658         tasklet_kill(&host->finish_tasklet);
1659         tasklet_kill(&host->block_tasklet);
1660 }
1661
1662 /*
1663  * Allocate all resources for the host.
1664  */
1665
1666 static int __devinit wbsd_request_resources(struct wbsd_host* host,
1667         int base, int irq, int dma)
1668 {
1669         int ret;
1670
1671         /*
1672          * Allocate I/O ports.
1673          */
1674         ret = wbsd_request_region(host, base);
1675         if (ret)
1676                 return ret;
1677
1678         /*
1679          * Allocate interrupt.
1680          */
1681         ret = wbsd_request_irq(host, irq);
1682         if (ret)
1683                 return ret;
1684
1685         /*
1686          * Allocate DMA.
1687          */
1688         wbsd_request_dma(host, dma);
1689
1690         return 0;
1691 }
1692
1693 /*
1694  * Release all resources for the host.
1695  */
1696
1697 static void __devexit wbsd_release_resources(struct wbsd_host* host)
1698 {
1699         wbsd_release_dma(host);
1700         wbsd_release_irq(host);
1701         wbsd_release_regions(host);
1702 }
1703
1704 /*
1705  * Configure the resources the chip should use.
1706  */
1707
1708 static void wbsd_chip_config(struct wbsd_host* host)
1709 {
1710         wbsd_unlock_config(host);
1711
1712         /*
1713          * Reset the chip.
1714          */
1715         wbsd_write_config(host, WBSD_CONF_SWRST, 1);
1716         wbsd_write_config(host, WBSD_CONF_SWRST, 0);
1717
1718         /*
1719          * Select SD/MMC function.
1720          */
1721         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1722
1723         /*
1724          * Set up card detection.
1725          */
1726         wbsd_write_config(host, WBSD_CONF_PINS, WBSD_PINS_DETECT_GP11);
1727
1728         /*
1729          * Configure chip
1730          */
1731         wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8);
1732         wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff);
1733
1734         wbsd_write_config(host, WBSD_CONF_IRQ, host->irq);
1735
1736         if (host->dma >= 0)
1737                 wbsd_write_config(host, WBSD_CONF_DRQ, host->dma);
1738
1739         /*
1740          * Enable and power up chip.
1741          */
1742         wbsd_write_config(host, WBSD_CONF_ENABLE, 1);
1743         wbsd_write_config(host, WBSD_CONF_POWER, 0x20);
1744
1745         wbsd_lock_config(host);
1746 }
1747
1748 /*
1749  * Check that configured resources are correct.
1750  */
1751
1752 static int wbsd_chip_validate(struct wbsd_host* host)
1753 {
1754         int base, irq, dma;
1755
1756         wbsd_unlock_config(host);
1757
1758         /*
1759          * Select SD/MMC function.
1760          */
1761         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1762
1763         /*
1764          * Read configuration.
1765          */
1766         base = wbsd_read_config(host, WBSD_CONF_PORT_HI) << 8;
1767         base |= wbsd_read_config(host, WBSD_CONF_PORT_LO);
1768
1769         irq = wbsd_read_config(host, WBSD_CONF_IRQ);
1770
1771         dma = wbsd_read_config(host, WBSD_CONF_DRQ);
1772
1773         wbsd_lock_config(host);
1774
1775         /*
1776          * Validate against given configuration.
1777          */
1778         if (base != host->base)
1779                 return 0;
1780         if (irq != host->irq)
1781                 return 0;
1782         if ((dma != host->dma) && (host->dma != -1))
1783                 return 0;
1784
1785         return 1;
1786 }
1787
1788 /*
1789  * Powers down the SD function
1790  */
1791
1792 static void wbsd_chip_poweroff(struct wbsd_host* host)
1793 {
1794         wbsd_unlock_config(host);
1795
1796         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1797         wbsd_write_config(host, WBSD_CONF_ENABLE, 0);
1798
1799         wbsd_lock_config(host);
1800 }
1801
1802 /*****************************************************************************\
1803  *                                                                           *
1804  * Devices setup and shutdown                                                *
1805  *                                                                           *
1806 \*****************************************************************************/
1807
1808 static int __devinit wbsd_init(struct device* dev, int base, int irq, int dma,
1809         int pnp)
1810 {
1811         struct wbsd_host* host = NULL;
1812         struct mmc_host* mmc = NULL;
1813         int ret;
1814
1815         ret = wbsd_alloc_mmc(dev);
1816         if (ret)
1817                 return ret;
1818
1819         mmc = dev_get_drvdata(dev);
1820         host = mmc_priv(mmc);
1821
1822         /*
1823          * Scan for hardware.
1824          */
1825         ret = wbsd_scan(host);
1826         if (ret)
1827         {
1828                 if (pnp && (ret == -ENODEV))
1829                 {
1830                         printk(KERN_WARNING DRIVER_NAME
1831                                 ": Unable to confirm device presence. You may "
1832                                 "experience lock-ups.\n");
1833                 }
1834                 else
1835                 {
1836                         wbsd_free_mmc(dev);
1837                         return ret;
1838                 }
1839         }
1840
1841         /*
1842          * Request resources.
1843          */
1844         ret = wbsd_request_resources(host, io, irq, dma);
1845         if (ret)
1846         {
1847                 wbsd_release_resources(host);
1848                 wbsd_free_mmc(dev);
1849                 return ret;
1850         }
1851
1852         /*
1853          * See if chip needs to be configured.
1854          */
1855         if (pnp && (host->config != 0))
1856         {
1857                 if (!wbsd_chip_validate(host))
1858                 {
1859                         printk(KERN_WARNING DRIVER_NAME
1860                                 ": PnP active but chip not configured! "
1861                                 "You probably have a buggy BIOS. "
1862                                 "Configuring chip manually.\n");
1863                         wbsd_chip_config(host);
1864                 }
1865         }
1866         else
1867                 wbsd_chip_config(host);
1868
1869         /*
1870          * Power Management stuff. No idea how this works.
1871          * Not tested.
1872          */
1873 #ifdef CONFIG_PM
1874         if (host->config)
1875         {
1876                 wbsd_unlock_config(host);
1877                 wbsd_write_config(host, WBSD_CONF_PME, 0xA0);
1878                 wbsd_lock_config(host);
1879         }
1880 #endif
1881         /*
1882          * Allow device to initialise itself properly.
1883          */
1884         mdelay(5);
1885
1886         /*
1887          * Reset the chip into a known state.
1888          */
1889         wbsd_init_device(host);
1890
1891         mmc_add_host(mmc);
1892
1893         printk(KERN_INFO "%s: W83L51xD", mmc_hostname(mmc));
1894         if (host->chip_id != 0)
1895                 printk(" id %x", (int)host->chip_id);
1896         printk(" at 0x%x irq %d", (int)host->base, (int)host->irq);
1897         if (host->dma >= 0)
1898                 printk(" dma %d", (int)host->dma);
1899         else
1900                 printk(" FIFO");
1901         if (pnp)
1902                 printk(" PnP");
1903         printk("\n");
1904
1905         return 0;
1906 }
1907
1908 static void __devexit wbsd_shutdown(struct device* dev, int pnp)
1909 {
1910         struct mmc_host* mmc = dev_get_drvdata(dev);
1911         struct wbsd_host* host;
1912
1913         if (!mmc)
1914                 return;
1915
1916         host = mmc_priv(mmc);
1917
1918         mmc_remove_host(mmc);
1919
1920         /*
1921          * Power down the SD/MMC function.
1922          */
1923         if (!pnp)
1924                 wbsd_chip_poweroff(host);
1925
1926         wbsd_release_resources(host);
1927
1928         wbsd_free_mmc(dev);
1929 }
1930
1931 /*
1932  * Non-PnP
1933  */
1934
1935 static int __devinit wbsd_probe(struct device* dev)
1936 {
1937         return wbsd_init(dev, io, irq, dma, 0);
1938 }
1939
1940 static int __devexit wbsd_remove(struct device* dev)
1941 {
1942         wbsd_shutdown(dev, 0);
1943
1944         return 0;
1945 }
1946
1947 /*
1948  * PnP
1949  */
1950
1951 #ifdef CONFIG_PNP
1952
1953 static int __devinit
1954 wbsd_pnp_probe(struct pnp_dev * pnpdev, const struct pnp_device_id *dev_id)
1955 {
1956         int io, irq, dma;
1957
1958         /*
1959          * Get resources from PnP layer.
1960          */
1961         io = pnp_port_start(pnpdev, 0);
1962         irq = pnp_irq(pnpdev, 0);
1963         if (pnp_dma_valid(pnpdev, 0))
1964                 dma = pnp_dma(pnpdev, 0);
1965         else
1966                 dma = -1;
1967
1968         DBGF("PnP resources: port %3x irq %d dma %d\n", io, irq, dma);
1969
1970         return wbsd_init(&pnpdev->dev, io, irq, dma, 1);
1971 }
1972
1973 static void __devexit wbsd_pnp_remove(struct pnp_dev * dev)
1974 {
1975         wbsd_shutdown(&dev->dev, 1);
1976 }
1977
1978 #endif /* CONFIG_PNP */
1979
1980 /*
1981  * Power management
1982  */
1983
1984 #ifdef CONFIG_PM
1985
1986 static int wbsd_suspend(struct device *dev, pm_message_t state)
1987 {
1988         struct mmc_host *mmc = dev_get_drvdata(dev);
1989         struct wbsd_host *host;
1990         int ret;
1991
1992         if (!mmc)
1993                 return 0;
1994
1995         DBG("Suspending...\n");
1996
1997         ret = mmc_suspend_host(mmc, state);
1998         if (!ret)
1999                 return ret;
2000
2001         host = mmc_priv(mmc);
2002
2003         wbsd_chip_poweroff(host);
2004
2005         return 0;
2006 }
2007
2008 static int wbsd_resume(struct device *dev)
2009 {
2010         struct mmc_host *mmc = dev_get_drvdata(dev);
2011         struct wbsd_host *host;
2012
2013         if (!mmc)
2014                 return 0;
2015
2016         DBG("Resuming...\n");
2017
2018         host = mmc_priv(mmc);
2019
2020         wbsd_chip_config(host);
2021
2022         /*
2023          * Allow device to initialise itself properly.
2024          */
2025         mdelay(5);
2026
2027         wbsd_init_device(host);
2028
2029         return mmc_resume_host(mmc);
2030 }
2031
2032 #else /* CONFIG_PM */
2033
2034 #define wbsd_suspend NULL
2035 #define wbsd_resume NULL
2036
2037 #endif /* CONFIG_PM */
2038
2039 static struct platform_device *wbsd_device;
2040
2041 static struct device_driver wbsd_driver = {
2042         .name           = DRIVER_NAME,
2043         .bus            = &platform_bus_type,
2044         .probe          = wbsd_probe,
2045         .remove         = wbsd_remove,
2046
2047         .suspend        = wbsd_suspend,
2048         .resume         = wbsd_resume,
2049 };
2050
2051 #ifdef CONFIG_PNP
2052
2053 static struct pnp_driver wbsd_pnp_driver = {
2054         .name           = DRIVER_NAME,
2055         .id_table       = pnp_dev_table,
2056         .probe          = wbsd_pnp_probe,
2057         .remove         = wbsd_pnp_remove,
2058 };
2059
2060 #endif /* CONFIG_PNP */
2061
2062 /*
2063  * Module loading/unloading
2064  */
2065
2066 static int __init wbsd_drv_init(void)
2067 {
2068         int result;
2069
2070         printk(KERN_INFO DRIVER_NAME
2071                 ": Winbond W83L51xD SD/MMC card interface driver, "
2072                 DRIVER_VERSION "\n");
2073         printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
2074
2075 #ifdef CONFIG_PNP
2076
2077         if (!nopnp)
2078         {
2079                 result = pnp_register_driver(&wbsd_pnp_driver);
2080                 if (result < 0)
2081                         return result;
2082         }
2083
2084 #endif /* CONFIG_PNP */
2085
2086         if (nopnp)
2087         {
2088                 result = driver_register(&wbsd_driver);
2089                 if (result < 0)
2090                         return result;
2091
2092                 wbsd_device = platform_device_register_simple(DRIVER_NAME, -1,
2093                         NULL, 0);
2094                 if (IS_ERR(wbsd_device))
2095                         return PTR_ERR(wbsd_device);
2096         }
2097
2098         return 0;
2099 }
2100
2101 static void __exit wbsd_drv_exit(void)
2102 {
2103 #ifdef CONFIG_PNP
2104
2105         if (!nopnp)
2106                 pnp_unregister_driver(&wbsd_pnp_driver);
2107
2108 #endif /* CONFIG_PNP */
2109
2110         if (nopnp)
2111         {
2112                 platform_device_unregister(wbsd_device);
2113
2114                 driver_unregister(&wbsd_driver);
2115         }
2116
2117         DBG("unloaded\n");
2118 }
2119
2120 module_init(wbsd_drv_init);
2121 module_exit(wbsd_drv_exit);
2122 #ifdef CONFIG_PNP
2123 module_param(nopnp, uint, 0444);
2124 #endif
2125 module_param(io, uint, 0444);
2126 module_param(irq, uint, 0444);
2127 module_param(dma, int, 0444);
2128
2129 MODULE_LICENSE("GPL");
2130 MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver");
2131 MODULE_VERSION(DRIVER_VERSION);
2132
2133 #ifdef CONFIG_PNP
2134 MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)");
2135 #endif
2136 MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)");
2137 MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)");
2138 MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)");