Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[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                 setup &= ~WBSD_DAT3_H;
1037
1038                 /*
1039                  * We cannot resume card detection immediatly
1040                  * because of capacitance and delays in the chip.
1041                  */
1042                 mod_timer(&host->ignore_timer, jiffies + HZ/100);
1043         }
1044         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
1045         
1046         /*
1047          * Store bus width for later. Will be used when
1048          * setting up the data transfer.
1049          */
1050         host->bus_width = ios->bus_width;
1051
1052         spin_unlock_bh(&host->lock);
1053 }
1054
1055 static int wbsd_get_ro(struct mmc_host* mmc)
1056 {
1057         struct wbsd_host* host = mmc_priv(mmc);
1058         u8 csr;
1059
1060         spin_lock_bh(&host->lock);
1061
1062         csr = inb(host->base + WBSD_CSR);
1063         csr |= WBSD_MSLED;
1064         outb(csr, host->base + WBSD_CSR);
1065
1066         mdelay(1);
1067
1068         csr = inb(host->base + WBSD_CSR);
1069         csr &= ~WBSD_MSLED;
1070         outb(csr, host->base + WBSD_CSR);
1071
1072         spin_unlock_bh(&host->lock);
1073
1074         return csr & WBSD_WRPT;
1075 }
1076
1077 static struct mmc_host_ops wbsd_ops = {
1078         .request        = wbsd_request,
1079         .set_ios        = wbsd_set_ios,
1080         .get_ro         = wbsd_get_ro,
1081 };
1082
1083 /*****************************************************************************\
1084  *                                                                           *
1085  * Interrupt handling                                                        *
1086  *                                                                           *
1087 \*****************************************************************************/
1088
1089 /*
1090  * Helper function to reset detection ignore
1091  */
1092
1093 static void wbsd_reset_ignore(unsigned long data)
1094 {
1095         struct wbsd_host *host = (struct wbsd_host*)data;
1096
1097         BUG_ON(host == NULL);
1098
1099         DBG("Resetting card detection ignore\n");
1100
1101         spin_lock_bh(&host->lock);
1102
1103         host->flags &= ~WBSD_FIGNORE_DETECT;
1104
1105         /*
1106          * Card status might have changed during the
1107          * blackout.
1108          */
1109         tasklet_schedule(&host->card_tasklet);
1110
1111         spin_unlock_bh(&host->lock);
1112 }
1113
1114 /*
1115  * Helper function for card detection
1116  */
1117 static void wbsd_detect_card(unsigned long data)
1118 {
1119         struct wbsd_host *host = (struct wbsd_host*)data;
1120         
1121         BUG_ON(host == NULL);
1122         
1123         DBG("Executing card detection\n");
1124         
1125         mmc_detect_change(host->mmc);   
1126 }
1127
1128 /*
1129  * Tasklets
1130  */
1131
1132 static inline struct mmc_data* wbsd_get_data(struct wbsd_host* host)
1133 {
1134         WARN_ON(!host->mrq);
1135         if (!host->mrq)
1136                 return NULL;
1137
1138         WARN_ON(!host->mrq->cmd);
1139         if (!host->mrq->cmd)
1140                 return NULL;
1141
1142         WARN_ON(!host->mrq->cmd->data);
1143         if (!host->mrq->cmd->data)
1144                 return NULL;
1145         
1146         return host->mrq->cmd->data;
1147 }
1148
1149 static void wbsd_tasklet_card(unsigned long param)
1150 {
1151         struct wbsd_host* host = (struct wbsd_host*)param;
1152         u8 csr;
1153         
1154         spin_lock(&host->lock);
1155         
1156         if (host->flags & WBSD_FIGNORE_DETECT)
1157         {
1158                 spin_unlock(&host->lock);
1159                 return;
1160         }
1161         
1162         csr = inb(host->base + WBSD_CSR);
1163         WARN_ON(csr == 0xff);
1164         
1165         if (csr & WBSD_CARDPRESENT)
1166         {
1167                 if (!(host->flags & WBSD_FCARD_PRESENT))
1168                 {
1169                         DBG("Card inserted\n");
1170                         host->flags |= WBSD_FCARD_PRESENT;
1171                         
1172                         /*
1173                          * Delay card detection to allow electrical connections
1174                          * to stabilise.
1175                          */
1176                         mod_timer(&host->detect_timer, jiffies + HZ/2);
1177                 }
1178                 
1179                 spin_unlock(&host->lock);
1180         }
1181         else if (host->flags & WBSD_FCARD_PRESENT)
1182         {
1183                 DBG("Card removed\n");
1184                 host->flags &= ~WBSD_FCARD_PRESENT;
1185                 
1186                 if (host->mrq)
1187                 {
1188                         printk(KERN_ERR DRIVER_NAME
1189                                 ": Card removed during transfer!\n");
1190                         wbsd_reset(host);
1191                         
1192                         host->mrq->cmd->error = MMC_ERR_FAILED;
1193                         tasklet_schedule(&host->finish_tasklet);
1194                 }
1195                 
1196                 /*
1197                  * Unlock first since we might get a call back.
1198                  */
1199                 spin_unlock(&host->lock);
1200
1201                 mmc_detect_change(host->mmc);
1202         }
1203         else
1204                 spin_unlock(&host->lock);
1205 }
1206
1207 static void wbsd_tasklet_fifo(unsigned long param)
1208 {
1209         struct wbsd_host* host = (struct wbsd_host*)param;
1210         struct mmc_data* data;
1211         
1212         spin_lock(&host->lock);
1213                 
1214         if (!host->mrq)
1215                 goto end;
1216         
1217         data = wbsd_get_data(host);
1218         if (!data)
1219                 goto end;
1220
1221         if (data->flags & MMC_DATA_WRITE)
1222                 wbsd_fill_fifo(host);
1223         else
1224                 wbsd_empty_fifo(host);
1225
1226         /*
1227          * Done?
1228          */
1229         if (host->size == data->bytes_xfered)
1230         {
1231                 wbsd_write_index(host, WBSD_IDX_FIFOEN, 0);
1232                 tasklet_schedule(&host->finish_tasklet);
1233         }
1234
1235 end:    
1236         spin_unlock(&host->lock);
1237 }
1238
1239 static void wbsd_tasklet_crc(unsigned long param)
1240 {
1241         struct wbsd_host* host = (struct wbsd_host*)param;
1242         struct mmc_data* data;
1243         
1244         spin_lock(&host->lock);
1245         
1246         if (!host->mrq)
1247                 goto end;
1248         
1249         data = wbsd_get_data(host);
1250         if (!data)
1251                 goto end;
1252         
1253         DBGF("CRC error\n");
1254
1255         data->error = MMC_ERR_BADCRC;
1256         
1257         tasklet_schedule(&host->finish_tasklet);
1258
1259 end:            
1260         spin_unlock(&host->lock);
1261 }
1262
1263 static void wbsd_tasklet_timeout(unsigned long param)
1264 {
1265         struct wbsd_host* host = (struct wbsd_host*)param;
1266         struct mmc_data* data;
1267         
1268         spin_lock(&host->lock);
1269         
1270         if (!host->mrq)
1271                 goto end;
1272         
1273         data = wbsd_get_data(host);
1274         if (!data)
1275                 goto end;
1276         
1277         DBGF("Timeout\n");
1278
1279         data->error = MMC_ERR_TIMEOUT;
1280         
1281         tasklet_schedule(&host->finish_tasklet);
1282
1283 end:    
1284         spin_unlock(&host->lock);
1285 }
1286
1287 static void wbsd_tasklet_finish(unsigned long param)
1288 {
1289         struct wbsd_host* host = (struct wbsd_host*)param;
1290         struct mmc_data* data;
1291         
1292         spin_lock(&host->lock);
1293         
1294         WARN_ON(!host->mrq);
1295         if (!host->mrq)
1296                 goto end;
1297         
1298         data = wbsd_get_data(host);
1299         if (!data)
1300                 goto end;
1301
1302         wbsd_finish_data(host, data);
1303         
1304 end:    
1305         spin_unlock(&host->lock);
1306 }
1307
1308 static void wbsd_tasklet_block(unsigned long param)
1309 {
1310         struct wbsd_host* host = (struct wbsd_host*)param;
1311         struct mmc_data* data;
1312         
1313         spin_lock(&host->lock);
1314
1315         if ((wbsd_read_index(host, WBSD_IDX_CRCSTATUS) & WBSD_CRC_MASK) !=
1316                 WBSD_CRC_OK)
1317         {
1318                 data = wbsd_get_data(host);
1319                 if (!data)
1320                         goto end;
1321                 
1322                 DBGF("CRC error\n");
1323
1324                 data->error = MMC_ERR_BADCRC;
1325         
1326                 tasklet_schedule(&host->finish_tasklet);
1327         }
1328
1329 end:    
1330         spin_unlock(&host->lock);
1331 }
1332
1333 /*
1334  * Interrupt handling
1335  */
1336
1337 static irqreturn_t wbsd_irq(int irq, void *dev_id, struct pt_regs *regs)
1338 {
1339         struct wbsd_host* host = dev_id;
1340         int isr;
1341         
1342         isr = inb(host->base + WBSD_ISR);
1343
1344         /*
1345          * Was it actually our hardware that caused the interrupt?
1346          */
1347         if (isr == 0xff || isr == 0x00)
1348                 return IRQ_NONE;
1349         
1350         host->isr |= isr;
1351
1352         /*
1353          * Schedule tasklets as needed.
1354          */
1355         if (isr & WBSD_INT_CARD)
1356                 tasklet_schedule(&host->card_tasklet);
1357         if (isr & WBSD_INT_FIFO_THRE)
1358                 tasklet_schedule(&host->fifo_tasklet);
1359         if (isr & WBSD_INT_CRC)
1360                 tasklet_hi_schedule(&host->crc_tasklet);
1361         if (isr & WBSD_INT_TIMEOUT)
1362                 tasklet_hi_schedule(&host->timeout_tasklet);
1363         if (isr & WBSD_INT_BUSYEND)
1364                 tasklet_hi_schedule(&host->block_tasklet);
1365         if (isr & WBSD_INT_TC)
1366                 tasklet_schedule(&host->finish_tasklet);
1367         
1368         return IRQ_HANDLED;
1369 }
1370
1371 /*****************************************************************************\
1372  *                                                                           *
1373  * Device initialisation and shutdown                                        *
1374  *                                                                           *
1375 \*****************************************************************************/
1376
1377 /*
1378  * Allocate/free MMC structure.
1379  */
1380
1381 static int __devinit wbsd_alloc_mmc(struct device* dev)
1382 {
1383         struct mmc_host* mmc;
1384         struct wbsd_host* host;
1385         
1386         /*
1387          * Allocate MMC structure.
1388          */
1389         mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev);
1390         if (!mmc)
1391                 return -ENOMEM;
1392         
1393         host = mmc_priv(mmc);
1394         host->mmc = mmc;
1395
1396         host->dma = -1;
1397
1398         /*
1399          * Set host parameters.
1400          */
1401         mmc->ops = &wbsd_ops;
1402         mmc->f_min = 375000;
1403         mmc->f_max = 24000000;
1404         mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34;
1405         mmc->caps = MMC_CAP_4_BIT_DATA;
1406         
1407         spin_lock_init(&host->lock);
1408         
1409         /*
1410          * Set up timers
1411          */
1412         init_timer(&host->detect_timer);
1413         host->detect_timer.data = (unsigned long)host;
1414         host->detect_timer.function = wbsd_detect_card;
1415
1416         init_timer(&host->ignore_timer);
1417         host->ignore_timer.data = (unsigned long)host;
1418         host->ignore_timer.function = wbsd_reset_ignore;
1419         
1420         /*
1421          * Maximum number of segments. Worst case is one sector per segment
1422          * so this will be 64kB/512.
1423          */
1424         mmc->max_hw_segs = 128;
1425         mmc->max_phys_segs = 128;
1426         
1427         /*
1428          * Maximum number of sectors in one transfer. Also limited by 64kB
1429          * buffer.
1430          */
1431         mmc->max_sectors = 128;
1432         
1433         /*
1434          * Maximum segment size. Could be one segment with the maximum number
1435          * of segments.
1436          */
1437         mmc->max_seg_size = mmc->max_sectors * 512;
1438         
1439         dev_set_drvdata(dev, mmc);
1440         
1441         return 0;
1442 }
1443
1444 static void __devexit wbsd_free_mmc(struct device* dev)
1445 {
1446         struct mmc_host* mmc;
1447         struct wbsd_host* host;
1448         
1449         mmc = dev_get_drvdata(dev);
1450         if (!mmc)
1451                 return;
1452         
1453         host = mmc_priv(mmc);
1454         BUG_ON(host == NULL);
1455         
1456         del_timer_sync(&host->ignore_timer);
1457         del_timer_sync(&host->detect_timer);
1458         
1459         mmc_free_host(mmc);
1460         
1461         dev_set_drvdata(dev, NULL);
1462 }
1463
1464 /*
1465  * Scan for known chip id:s
1466  */
1467
1468 static int __devinit wbsd_scan(struct wbsd_host* host)
1469 {
1470         int i, j, k;
1471         int id;
1472         
1473         /*
1474          * Iterate through all ports, all codes to
1475          * find hardware that is in our known list.
1476          */
1477         for (i = 0;i < sizeof(config_ports)/sizeof(int);i++)
1478         {
1479                 if (!request_region(config_ports[i], 2, DRIVER_NAME))
1480                         continue;
1481                         
1482                 for (j = 0;j < sizeof(unlock_codes)/sizeof(int);j++)
1483                 {
1484                         id = 0xFFFF;
1485                         
1486                         outb(unlock_codes[j], config_ports[i]);
1487                         outb(unlock_codes[j], config_ports[i]);
1488                         
1489                         outb(WBSD_CONF_ID_HI, config_ports[i]);
1490                         id = inb(config_ports[i] + 1) << 8;
1491
1492                         outb(WBSD_CONF_ID_LO, config_ports[i]);
1493                         id |= inb(config_ports[i] + 1);
1494                         
1495                         for (k = 0;k < sizeof(valid_ids)/sizeof(int);k++)
1496                         {
1497                                 if (id == valid_ids[k])
1498                                 {                               
1499                                         host->chip_id = id;
1500                                         host->config = config_ports[i];
1501                                         host->unlock_code = unlock_codes[i];
1502                                 
1503                                         return 0;
1504                                 }
1505                         }
1506                         
1507                         if (id != 0xFFFF)
1508                         {
1509                                 DBG("Unknown hardware (id %x) found at %x\n",
1510                                         id, config_ports[i]);
1511                         }
1512
1513                         outb(LOCK_CODE, config_ports[i]);
1514                 }
1515                 
1516                 release_region(config_ports[i], 2);
1517         }
1518         
1519         return -ENODEV;
1520 }
1521
1522 /*
1523  * Allocate/free io port ranges
1524  */
1525
1526 static int __devinit wbsd_request_region(struct wbsd_host* host, int base)
1527 {
1528         if (io & 0x7)
1529                 return -EINVAL;
1530         
1531         if (!request_region(base, 8, DRIVER_NAME))
1532                 return -EIO;
1533         
1534         host->base = io;
1535                 
1536         return 0;
1537 }
1538
1539 static void __devexit wbsd_release_regions(struct wbsd_host* host)
1540 {
1541         if (host->base)
1542                 release_region(host->base, 8);
1543         
1544         host->base = 0;
1545
1546         if (host->config)
1547                 release_region(host->config, 2);
1548         
1549         host->config = 0;
1550 }
1551
1552 /*
1553  * Allocate/free DMA port and buffer
1554  */
1555
1556 static void __devinit wbsd_request_dma(struct wbsd_host* host, int dma)
1557 {
1558         if (dma < 0)
1559                 return;
1560         
1561         if (request_dma(dma, DRIVER_NAME))
1562                 goto err;
1563         
1564         /*
1565          * We need to allocate a special buffer in
1566          * order for ISA to be able to DMA to it.
1567          */
1568         host->dma_buffer = kmalloc(WBSD_DMA_SIZE,
1569                 GFP_NOIO | GFP_DMA | __GFP_REPEAT | __GFP_NOWARN);
1570         if (!host->dma_buffer)
1571                 goto free;
1572
1573         /*
1574          * Translate the address to a physical address.
1575          */
1576         host->dma_addr = dma_map_single(host->mmc->dev, host->dma_buffer,
1577                 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1578                         
1579         /*
1580          * ISA DMA must be aligned on a 64k basis.
1581          */
1582         if ((host->dma_addr & 0xffff) != 0)
1583                 goto kfree;
1584         /*
1585          * ISA cannot access memory above 16 MB.
1586          */
1587         else if (host->dma_addr >= 0x1000000)
1588                 goto kfree;
1589
1590         host->dma = dma;
1591         
1592         return;
1593         
1594 kfree:
1595         /*
1596          * If we've gotten here then there is some kind of alignment bug
1597          */
1598         BUG_ON(1);
1599         
1600         dma_unmap_single(host->mmc->dev, host->dma_addr, WBSD_DMA_SIZE,
1601                 DMA_BIDIRECTIONAL);
1602         host->dma_addr = (dma_addr_t)NULL;
1603         
1604         kfree(host->dma_buffer);
1605         host->dma_buffer = NULL;
1606
1607 free:
1608         free_dma(dma);
1609
1610 err:
1611         printk(KERN_WARNING DRIVER_NAME ": Unable to allocate DMA %d. "
1612                 "Falling back on FIFO.\n", dma);
1613 }
1614
1615 static void __devexit wbsd_release_dma(struct wbsd_host* host)
1616 {
1617         if (host->dma_addr)
1618                 dma_unmap_single(host->mmc->dev, host->dma_addr, WBSD_DMA_SIZE,
1619                         DMA_BIDIRECTIONAL);
1620         if (host->dma_buffer)
1621                 kfree(host->dma_buffer);
1622         if (host->dma >= 0)
1623                 free_dma(host->dma);
1624         
1625         host->dma = -1;
1626         host->dma_buffer = NULL;
1627         host->dma_addr = (dma_addr_t)NULL;
1628 }
1629
1630 /*
1631  * Allocate/free IRQ.
1632  */
1633
1634 static int __devinit wbsd_request_irq(struct wbsd_host* host, int irq)
1635 {
1636         int ret;
1637         
1638         /*
1639          * Allocate interrupt.
1640          */
1641
1642         ret = request_irq(irq, wbsd_irq, SA_SHIRQ, DRIVER_NAME, host);
1643         if (ret)
1644                 return ret;
1645         
1646         host->irq = irq;
1647
1648         /*
1649          * Set up tasklets.
1650          */
1651         tasklet_init(&host->card_tasklet, wbsd_tasklet_card, (unsigned long)host);
1652         tasklet_init(&host->fifo_tasklet, wbsd_tasklet_fifo, (unsigned long)host);
1653         tasklet_init(&host->crc_tasklet, wbsd_tasklet_crc, (unsigned long)host);
1654         tasklet_init(&host->timeout_tasklet, wbsd_tasklet_timeout, (unsigned long)host);
1655         tasklet_init(&host->finish_tasklet, wbsd_tasklet_finish, (unsigned long)host);
1656         tasklet_init(&host->block_tasklet, wbsd_tasklet_block, (unsigned long)host);
1657         
1658         return 0;
1659 }
1660
1661 static void __devexit wbsd_release_irq(struct wbsd_host* host)
1662 {
1663         if (!host->irq)
1664                 return;
1665
1666         free_irq(host->irq, host);
1667         
1668         host->irq = 0;
1669                 
1670         tasklet_kill(&host->card_tasklet);
1671         tasklet_kill(&host->fifo_tasklet);
1672         tasklet_kill(&host->crc_tasklet);
1673         tasklet_kill(&host->timeout_tasklet);
1674         tasklet_kill(&host->finish_tasklet);
1675         tasklet_kill(&host->block_tasklet);
1676 }
1677
1678 /*
1679  * Allocate all resources for the host.
1680  */
1681
1682 static int __devinit wbsd_request_resources(struct wbsd_host* host,
1683         int base, int irq, int dma)
1684 {
1685         int ret;
1686         
1687         /*
1688          * Allocate I/O ports.
1689          */
1690         ret = wbsd_request_region(host, base);
1691         if (ret)
1692                 return ret;
1693
1694         /*
1695          * Allocate interrupt.
1696          */
1697         ret = wbsd_request_irq(host, irq);
1698         if (ret)
1699                 return ret;
1700
1701         /*
1702          * Allocate DMA.
1703          */
1704         wbsd_request_dma(host, dma);
1705         
1706         return 0;
1707 }
1708
1709 /*
1710  * Release all resources for the host.
1711  */
1712
1713 static void __devexit wbsd_release_resources(struct wbsd_host* host)
1714 {
1715         wbsd_release_dma(host);
1716         wbsd_release_irq(host);
1717         wbsd_release_regions(host);
1718 }
1719
1720 /*
1721  * Configure the resources the chip should use.
1722  */
1723
1724 static void __devinit wbsd_chip_config(struct wbsd_host* host)
1725 {
1726         /*
1727          * Reset the chip.
1728          */     
1729         wbsd_write_config(host, WBSD_CONF_SWRST, 1);
1730         wbsd_write_config(host, WBSD_CONF_SWRST, 0);
1731
1732         /*
1733          * Select SD/MMC function.
1734          */
1735         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1736         
1737         /*
1738          * Set up card detection.
1739          */
1740         wbsd_write_config(host, WBSD_CONF_PINS, WBSD_PINS_DETECT_GP11);
1741         
1742         /*
1743          * Configure chip
1744          */
1745         wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8);
1746         wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff);
1747         
1748         wbsd_write_config(host, WBSD_CONF_IRQ, host->irq);
1749         
1750         if (host->dma >= 0)
1751                 wbsd_write_config(host, WBSD_CONF_DRQ, host->dma);
1752         
1753         /*
1754          * Enable and power up chip.
1755          */
1756         wbsd_write_config(host, WBSD_CONF_ENABLE, 1);
1757         wbsd_write_config(host, WBSD_CONF_POWER, 0x20);
1758 }
1759
1760 /*
1761  * Check that configured resources are correct.
1762  */
1763  
1764 static int __devinit wbsd_chip_validate(struct wbsd_host* host)
1765 {
1766         int base, irq, dma;
1767         
1768         /*
1769          * Select SD/MMC function.
1770          */
1771         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1772         
1773         /*
1774          * Read configuration.
1775          */
1776         base = wbsd_read_config(host, WBSD_CONF_PORT_HI) << 8;
1777         base |= wbsd_read_config(host, WBSD_CONF_PORT_LO);
1778         
1779         irq = wbsd_read_config(host, WBSD_CONF_IRQ);
1780         
1781         dma = wbsd_read_config(host, WBSD_CONF_DRQ);
1782         
1783         /*
1784          * Validate against given configuration.
1785          */
1786         if (base != host->base)
1787                 return 0;
1788         if (irq != host->irq)
1789                 return 0;
1790         if ((dma != host->dma) && (host->dma != -1))
1791                 return 0;
1792         
1793         return 1;
1794 }
1795
1796 /*****************************************************************************\
1797  *                                                                           *
1798  * Devices setup and shutdown                                                *
1799  *                                                                           *
1800 \*****************************************************************************/
1801
1802 static int __devinit wbsd_init(struct device* dev, int base, int irq, int dma,
1803         int pnp)
1804 {
1805         struct wbsd_host* host = NULL;
1806         struct mmc_host* mmc = NULL;
1807         int ret;
1808         
1809         ret = wbsd_alloc_mmc(dev);
1810         if (ret)
1811                 return ret;
1812         
1813         mmc = dev_get_drvdata(dev);
1814         host = mmc_priv(mmc);
1815         
1816         /*
1817          * Scan for hardware.
1818          */
1819         ret = wbsd_scan(host);
1820         if (ret)
1821         {
1822                 if (pnp && (ret == -ENODEV))
1823                 {
1824                         printk(KERN_WARNING DRIVER_NAME
1825                                 ": Unable to confirm device presence. You may "
1826                                 "experience lock-ups.\n");
1827                 }
1828                 else
1829                 {
1830                         wbsd_free_mmc(dev);
1831                         return ret;
1832                 }
1833         }
1834         
1835         /*
1836          * Request resources.
1837          */
1838         ret = wbsd_request_resources(host, io, irq, dma);
1839         if (ret)
1840         {
1841                 wbsd_release_resources(host);
1842                 wbsd_free_mmc(dev);
1843                 return ret;
1844         }
1845         
1846         /*
1847          * See if chip needs to be configured.
1848          */
1849         if (pnp && (host->config != 0))
1850         {
1851                 if (!wbsd_chip_validate(host))
1852                 {
1853                         printk(KERN_WARNING DRIVER_NAME
1854                                 ": PnP active but chip not configured! "
1855                                 "You probably have a buggy BIOS. "
1856                                 "Configuring chip manually.\n");
1857                         wbsd_chip_config(host);
1858                 }
1859         }
1860         else
1861                 wbsd_chip_config(host);
1862         
1863         /*
1864          * Power Management stuff. No idea how this works.
1865          * Not tested.
1866          */
1867 #ifdef CONFIG_PM
1868         if (host->config)
1869                 wbsd_write_config(host, WBSD_CONF_PME, 0xA0);
1870 #endif
1871         /*
1872          * Allow device to initialise itself properly.
1873          */
1874         mdelay(5);
1875
1876         /*
1877          * Reset the chip into a known state.
1878          */
1879         wbsd_init_device(host);
1880         
1881         mmc_add_host(mmc);
1882
1883         printk(KERN_INFO "%s: W83L51xD", mmc_hostname(mmc));
1884         if (host->chip_id != 0)
1885                 printk(" id %x", (int)host->chip_id);
1886         printk(" at 0x%x irq %d", (int)host->base, (int)host->irq);
1887         if (host->dma >= 0)
1888                 printk(" dma %d", (int)host->dma);
1889         else
1890                 printk(" FIFO");
1891         if (pnp)
1892                 printk(" PnP");
1893         printk("\n");
1894
1895         return 0;
1896 }
1897
1898 static void __devexit wbsd_shutdown(struct device* dev, int pnp)
1899 {
1900         struct mmc_host* mmc = dev_get_drvdata(dev);
1901         struct wbsd_host* host;
1902         
1903         if (!mmc)
1904                 return;
1905
1906         host = mmc_priv(mmc);
1907         
1908         mmc_remove_host(mmc);
1909
1910         if (!pnp)
1911         {
1912                 /*
1913                  * Power down the SD/MMC function.
1914                  */
1915                 wbsd_unlock_config(host);
1916                 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1917                 wbsd_write_config(host, WBSD_CONF_ENABLE, 0);
1918                 wbsd_lock_config(host);
1919         }
1920         
1921         wbsd_release_resources(host);
1922         
1923         wbsd_free_mmc(dev);
1924 }
1925
1926 /*
1927  * Non-PnP
1928  */
1929
1930 static int __devinit wbsd_probe(struct device* dev)
1931 {
1932         return wbsd_init(dev, io, irq, dma, 0);
1933 }
1934
1935 static int __devexit wbsd_remove(struct device* dev)
1936 {
1937         wbsd_shutdown(dev, 0);
1938
1939         return 0;
1940 }
1941
1942 /*
1943  * PnP
1944  */
1945
1946 #ifdef CONFIG_PNP
1947
1948 static int __devinit
1949 wbsd_pnp_probe(struct pnp_dev * pnpdev, const struct pnp_device_id *dev_id)
1950 {
1951         int io, irq, dma;
1952         
1953         /*
1954          * Get resources from PnP layer.
1955          */
1956         io = pnp_port_start(pnpdev, 0);
1957         irq = pnp_irq(pnpdev, 0);
1958         if (pnp_dma_valid(pnpdev, 0))
1959                 dma = pnp_dma(pnpdev, 0);
1960         else
1961                 dma = -1;
1962         
1963         DBGF("PnP resources: port %3x irq %d dma %d\n", io, irq, dma);
1964         
1965         return wbsd_init(&pnpdev->dev, io, irq, dma, 1);
1966 }
1967
1968 static void __devexit wbsd_pnp_remove(struct pnp_dev * dev)
1969 {
1970         wbsd_shutdown(&dev->dev, 1);
1971 }
1972
1973 #endif /* CONFIG_PNP */
1974
1975 /*
1976  * Power management
1977  */
1978
1979 #ifdef CONFIG_PM
1980 static int wbsd_suspend(struct device *dev, pm_message_t state, u32 level)
1981 {
1982         DBGF("Not yet supported\n");
1983
1984         return 0;
1985 }
1986
1987 static int wbsd_resume(struct device *dev, u32 level)
1988 {
1989         DBGF("Not yet supported\n");
1990
1991         return 0;
1992 }
1993 #else
1994 #define wbsd_suspend NULL
1995 #define wbsd_resume NULL
1996 #endif
1997
1998 static struct platform_device *wbsd_device;
1999
2000 static struct device_driver wbsd_driver = {
2001         .name           = DRIVER_NAME,
2002         .bus            = &platform_bus_type,
2003         .probe          = wbsd_probe,
2004         .remove         = wbsd_remove,
2005         
2006         .suspend        = wbsd_suspend,
2007         .resume         = wbsd_resume,
2008 };
2009
2010 #ifdef CONFIG_PNP
2011
2012 static struct pnp_driver wbsd_pnp_driver = {
2013         .name           = DRIVER_NAME,
2014         .id_table       = pnp_dev_table,
2015         .probe          = wbsd_pnp_probe,
2016         .remove         = wbsd_pnp_remove,
2017 };
2018
2019 #endif /* CONFIG_PNP */
2020
2021 /*
2022  * Module loading/unloading
2023  */
2024
2025 static int __init wbsd_drv_init(void)
2026 {
2027         int result;
2028         
2029         printk(KERN_INFO DRIVER_NAME
2030                 ": Winbond W83L51xD SD/MMC card interface driver, "
2031                 DRIVER_VERSION "\n");
2032         printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
2033
2034 #ifdef CONFIG_PNP
2035
2036         if (!nopnp)
2037         {
2038                 result = pnp_register_driver(&wbsd_pnp_driver);
2039                 if (result < 0)
2040                         return result;
2041         }
2042
2043 #endif /* CONFIG_PNP */ 
2044         
2045         if (nopnp)
2046         {
2047                 result = driver_register(&wbsd_driver);
2048                 if (result < 0)
2049                         return result;
2050
2051                 wbsd_device = platform_device_register_simple(DRIVER_NAME, -1,
2052                         NULL, 0);
2053                 if (IS_ERR(wbsd_device))
2054                         return PTR_ERR(wbsd_device);
2055         }
2056
2057         return 0;
2058 }
2059
2060 static void __exit wbsd_drv_exit(void)
2061 {
2062 #ifdef CONFIG_PNP
2063
2064         if (!nopnp)
2065                 pnp_unregister_driver(&wbsd_pnp_driver);
2066         
2067 #endif /* CONFIG_PNP */ 
2068
2069         if (nopnp)
2070         {
2071                 platform_device_unregister(wbsd_device);
2072         
2073                 driver_unregister(&wbsd_driver);
2074         }
2075
2076         DBG("unloaded\n");
2077 }
2078
2079 module_init(wbsd_drv_init);
2080 module_exit(wbsd_drv_exit);
2081 #ifdef CONFIG_PNP
2082 module_param(nopnp, uint, 0444);
2083 #endif
2084 module_param(io, uint, 0444);
2085 module_param(irq, uint, 0444);
2086 module_param(dma, int, 0444);
2087
2088 MODULE_LICENSE("GPL");
2089 MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver");
2090 MODULE_VERSION(DRIVER_VERSION);
2091
2092 #ifdef CONFIG_PNP
2093 MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)");
2094 #endif
2095 MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)");
2096 MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)");
2097 MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)");