Merge branch 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6
[linux-2.6.git] / drivers / mmc / sdhci.c
1 /*
2  *  linux/drivers/mmc/sdhci.c - Secure Digital Host Controller Interface driver
3  *
4  *  Copyright (C) 2005-2006 Pierre Ossman, All Rights Reserved.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or (at
9  * your option) any later version.
10  */
11
12 #include <linux/delay.h>
13 #include <linux/highmem.h>
14 #include <linux/pci.h>
15 #include <linux/dma-mapping.h>
16
17 #include <linux/mmc/host.h>
18 #include <linux/mmc/protocol.h>
19
20 #include <asm/scatterlist.h>
21
22 #include "sdhci.h"
23
24 #define DRIVER_NAME "sdhci"
25 #define DRIVER_VERSION "0.12"
26
27 #define BUGMAIL "<sdhci-devel@list.drzeus.cx>"
28
29 #define DBG(f, x...) \
30         pr_debug(DRIVER_NAME " [%s()]: " f, __func__,## x)
31
32 static unsigned int debug_nodma = 0;
33 static unsigned int debug_forcedma = 0;
34 static unsigned int debug_quirks = 0;
35
36 #define SDHCI_QUIRK_CLOCK_BEFORE_RESET                  (1<<0)
37 #define SDHCI_QUIRK_FORCE_DMA                           (1<<1)
38 /* Controller doesn't like some resets when there is no card inserted. */
39 #define SDHCI_QUIRK_NO_CARD_NO_RESET                    (1<<2)
40
41 static const struct pci_device_id pci_ids[] __devinitdata = {
42         {
43                 .vendor         = PCI_VENDOR_ID_RICOH,
44                 .device         = PCI_DEVICE_ID_RICOH_R5C822,
45                 .subvendor      = PCI_VENDOR_ID_IBM,
46                 .subdevice      = PCI_ANY_ID,
47                 .driver_data    = SDHCI_QUIRK_CLOCK_BEFORE_RESET |
48                                   SDHCI_QUIRK_FORCE_DMA,
49         },
50
51         {
52                 .vendor         = PCI_VENDOR_ID_RICOH,
53                 .device         = PCI_DEVICE_ID_RICOH_R5C822,
54                 .subvendor      = PCI_ANY_ID,
55                 .subdevice      = PCI_ANY_ID,
56                 .driver_data    = SDHCI_QUIRK_FORCE_DMA |
57                                   SDHCI_QUIRK_NO_CARD_NO_RESET,
58         },
59
60         {
61                 .vendor         = PCI_VENDOR_ID_TI,
62                 .device         = PCI_DEVICE_ID_TI_XX21_XX11_SD,
63                 .subvendor      = PCI_ANY_ID,
64                 .subdevice      = PCI_ANY_ID,
65                 .driver_data    = SDHCI_QUIRK_FORCE_DMA,
66         },
67
68         {       /* Generic SD host controller */
69                 PCI_DEVICE_CLASS((PCI_CLASS_SYSTEM_SDHCI << 8), 0xFFFF00)
70         },
71
72         { /* end: all zeroes */ },
73 };
74
75 MODULE_DEVICE_TABLE(pci, pci_ids);
76
77 static void sdhci_prepare_data(struct sdhci_host *, struct mmc_data *);
78 static void sdhci_finish_data(struct sdhci_host *);
79
80 static void sdhci_send_command(struct sdhci_host *, struct mmc_command *);
81 static void sdhci_finish_command(struct sdhci_host *);
82
83 static void sdhci_dumpregs(struct sdhci_host *host)
84 {
85         printk(KERN_DEBUG DRIVER_NAME ": ============== REGISTER DUMP ==============\n");
86
87         printk(KERN_DEBUG DRIVER_NAME ": Sys addr: 0x%08x | Version:  0x%08x\n",
88                 readl(host->ioaddr + SDHCI_DMA_ADDRESS),
89                 readw(host->ioaddr + SDHCI_HOST_VERSION));
90         printk(KERN_DEBUG DRIVER_NAME ": Blk size: 0x%08x | Blk cnt:  0x%08x\n",
91                 readw(host->ioaddr + SDHCI_BLOCK_SIZE),
92                 readw(host->ioaddr + SDHCI_BLOCK_COUNT));
93         printk(KERN_DEBUG DRIVER_NAME ": Argument: 0x%08x | Trn mode: 0x%08x\n",
94                 readl(host->ioaddr + SDHCI_ARGUMENT),
95                 readw(host->ioaddr + SDHCI_TRANSFER_MODE));
96         printk(KERN_DEBUG DRIVER_NAME ": Present:  0x%08x | Host ctl: 0x%08x\n",
97                 readl(host->ioaddr + SDHCI_PRESENT_STATE),
98                 readb(host->ioaddr + SDHCI_HOST_CONTROL));
99         printk(KERN_DEBUG DRIVER_NAME ": Power:    0x%08x | Blk gap:  0x%08x\n",
100                 readb(host->ioaddr + SDHCI_POWER_CONTROL),
101                 readb(host->ioaddr + SDHCI_BLOCK_GAP_CONTROL));
102         printk(KERN_DEBUG DRIVER_NAME ": Wake-up:  0x%08x | Clock:    0x%08x\n",
103                 readb(host->ioaddr + SDHCI_WALK_UP_CONTROL),
104                 readw(host->ioaddr + SDHCI_CLOCK_CONTROL));
105         printk(KERN_DEBUG DRIVER_NAME ": Timeout:  0x%08x | Int stat: 0x%08x\n",
106                 readb(host->ioaddr + SDHCI_TIMEOUT_CONTROL),
107                 readl(host->ioaddr + SDHCI_INT_STATUS));
108         printk(KERN_DEBUG DRIVER_NAME ": Int enab: 0x%08x | Sig enab: 0x%08x\n",
109                 readl(host->ioaddr + SDHCI_INT_ENABLE),
110                 readl(host->ioaddr + SDHCI_SIGNAL_ENABLE));
111         printk(KERN_DEBUG DRIVER_NAME ": AC12 err: 0x%08x | Slot int: 0x%08x\n",
112                 readw(host->ioaddr + SDHCI_ACMD12_ERR),
113                 readw(host->ioaddr + SDHCI_SLOT_INT_STATUS));
114         printk(KERN_DEBUG DRIVER_NAME ": Caps:     0x%08x | Max curr: 0x%08x\n",
115                 readl(host->ioaddr + SDHCI_CAPABILITIES),
116                 readl(host->ioaddr + SDHCI_MAX_CURRENT));
117
118         printk(KERN_DEBUG DRIVER_NAME ": ===========================================\n");
119 }
120
121 /*****************************************************************************\
122  *                                                                           *
123  * Low level functions                                                       *
124  *                                                                           *
125 \*****************************************************************************/
126
127 static void sdhci_reset(struct sdhci_host *host, u8 mask)
128 {
129         unsigned long timeout;
130
131         if (host->chip->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
132                 if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) &
133                         SDHCI_CARD_PRESENT))
134                         return;
135         }
136
137         writeb(mask, host->ioaddr + SDHCI_SOFTWARE_RESET);
138
139         if (mask & SDHCI_RESET_ALL)
140                 host->clock = 0;
141
142         /* Wait max 100 ms */
143         timeout = 100;
144
145         /* hw clears the bit when it's done */
146         while (readb(host->ioaddr + SDHCI_SOFTWARE_RESET) & mask) {
147                 if (timeout == 0) {
148                         printk(KERN_ERR "%s: Reset 0x%x never completed. "
149                                 "Please report this to " BUGMAIL ".\n",
150                                 mmc_hostname(host->mmc), (int)mask);
151                         sdhci_dumpregs(host);
152                         return;
153                 }
154                 timeout--;
155                 mdelay(1);
156         }
157 }
158
159 static void sdhci_init(struct sdhci_host *host)
160 {
161         u32 intmask;
162
163         sdhci_reset(host, SDHCI_RESET_ALL);
164
165         intmask = SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
166                 SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT | SDHCI_INT_INDEX |
167                 SDHCI_INT_END_BIT | SDHCI_INT_CRC | SDHCI_INT_TIMEOUT |
168                 SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT |
169                 SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL |
170                 SDHCI_INT_DMA_END | SDHCI_INT_DATA_END | SDHCI_INT_RESPONSE;
171
172         writel(intmask, host->ioaddr + SDHCI_INT_ENABLE);
173         writel(intmask, host->ioaddr + SDHCI_SIGNAL_ENABLE);
174 }
175
176 static void sdhci_activate_led(struct sdhci_host *host)
177 {
178         u8 ctrl;
179
180         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
181         ctrl |= SDHCI_CTRL_LED;
182         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
183 }
184
185 static void sdhci_deactivate_led(struct sdhci_host *host)
186 {
187         u8 ctrl;
188
189         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
190         ctrl &= ~SDHCI_CTRL_LED;
191         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
192 }
193
194 /*****************************************************************************\
195  *                                                                           *
196  * Core functions                                                            *
197  *                                                                           *
198 \*****************************************************************************/
199
200 static inline char* sdhci_kmap_sg(struct sdhci_host* host)
201 {
202         host->mapped_sg = kmap_atomic(host->cur_sg->page, KM_BIO_SRC_IRQ);
203         return host->mapped_sg + host->cur_sg->offset;
204 }
205
206 static inline void sdhci_kunmap_sg(struct sdhci_host* host)
207 {
208         kunmap_atomic(host->mapped_sg, KM_BIO_SRC_IRQ);
209 }
210
211 static inline int sdhci_next_sg(struct sdhci_host* host)
212 {
213         /*
214          * Skip to next SG entry.
215          */
216         host->cur_sg++;
217         host->num_sg--;
218
219         /*
220          * Any entries left?
221          */
222         if (host->num_sg > 0) {
223                 host->offset = 0;
224                 host->remain = host->cur_sg->length;
225         }
226
227         return host->num_sg;
228 }
229
230 static void sdhci_read_block_pio(struct sdhci_host *host)
231 {
232         int blksize, chunk_remain;
233         u32 data;
234         char *buffer;
235         int size;
236
237         DBG("PIO reading\n");
238
239         blksize = host->data->blksz;
240         chunk_remain = 0;
241         data = 0;
242
243         buffer = sdhci_kmap_sg(host) + host->offset;
244
245         while (blksize) {
246                 if (chunk_remain == 0) {
247                         data = readl(host->ioaddr + SDHCI_BUFFER);
248                         chunk_remain = min(blksize, 4);
249                 }
250
251                 size = min(host->size, host->remain);
252                 size = min(size, chunk_remain);
253
254                 chunk_remain -= size;
255                 blksize -= size;
256                 host->offset += size;
257                 host->remain -= size;
258                 host->size -= size;
259                 while (size) {
260                         *buffer = data & 0xFF;
261                         buffer++;
262                         data >>= 8;
263                         size--;
264                 }
265
266                 if (host->remain == 0) {
267                         sdhci_kunmap_sg(host);
268                         if (sdhci_next_sg(host) == 0) {
269                                 BUG_ON(blksize != 0);
270                                 return;
271                         }
272                         buffer = sdhci_kmap_sg(host);
273                 }
274         }
275
276         sdhci_kunmap_sg(host);
277 }
278
279 static void sdhci_write_block_pio(struct sdhci_host *host)
280 {
281         int blksize, chunk_remain;
282         u32 data;
283         char *buffer;
284         int bytes, size;
285
286         DBG("PIO writing\n");
287
288         blksize = host->data->blksz;
289         chunk_remain = 4;
290         data = 0;
291
292         bytes = 0;
293         buffer = sdhci_kmap_sg(host) + host->offset;
294
295         while (blksize) {
296                 size = min(host->size, host->remain);
297                 size = min(size, chunk_remain);
298
299                 chunk_remain -= size;
300                 blksize -= size;
301                 host->offset += size;
302                 host->remain -= size;
303                 host->size -= size;
304                 while (size) {
305                         data >>= 8;
306                         data |= (u32)*buffer << 24;
307                         buffer++;
308                         size--;
309                 }
310
311                 if (chunk_remain == 0) {
312                         writel(data, host->ioaddr + SDHCI_BUFFER);
313                         chunk_remain = min(blksize, 4);
314                 }
315
316                 if (host->remain == 0) {
317                         sdhci_kunmap_sg(host);
318                         if (sdhci_next_sg(host) == 0) {
319                                 BUG_ON(blksize != 0);
320                                 return;
321                         }
322                         buffer = sdhci_kmap_sg(host);
323                 }
324         }
325
326         sdhci_kunmap_sg(host);
327 }
328
329 static void sdhci_transfer_pio(struct sdhci_host *host)
330 {
331         u32 mask;
332
333         BUG_ON(!host->data);
334
335         if (host->size == 0)
336                 return;
337
338         if (host->data->flags & MMC_DATA_READ)
339                 mask = SDHCI_DATA_AVAILABLE;
340         else
341                 mask = SDHCI_SPACE_AVAILABLE;
342
343         while (readl(host->ioaddr + SDHCI_PRESENT_STATE) & mask) {
344                 if (host->data->flags & MMC_DATA_READ)
345                         sdhci_read_block_pio(host);
346                 else
347                         sdhci_write_block_pio(host);
348
349                 if (host->size == 0)
350                         break;
351
352                 BUG_ON(host->num_sg == 0);
353         }
354
355         DBG("PIO transfer complete.\n");
356 }
357
358 static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data)
359 {
360         u8 count;
361         unsigned target_timeout, current_timeout;
362
363         WARN_ON(host->data);
364
365         if (data == NULL)
366                 return;
367
368         DBG("blksz %04x blks %04x flags %08x\n",
369                 data->blksz, data->blocks, data->flags);
370         DBG("tsac %d ms nsac %d clk\n",
371                 data->timeout_ns / 1000000, data->timeout_clks);
372
373         /* Sanity checks */
374         BUG_ON(data->blksz * data->blocks > 524288);
375         BUG_ON(data->blksz > host->max_block);
376         BUG_ON(data->blocks > 65535);
377
378         /* timeout in us */
379         target_timeout = data->timeout_ns / 1000 +
380                 data->timeout_clks / host->clock;
381
382         /*
383          * Figure out needed cycles.
384          * We do this in steps in order to fit inside a 32 bit int.
385          * The first step is the minimum timeout, which will have a
386          * minimum resolution of 6 bits:
387          * (1) 2^13*1000 > 2^22,
388          * (2) host->timeout_clk < 2^16
389          *     =>
390          *     (1) / (2) > 2^6
391          */
392         count = 0;
393         current_timeout = (1 << 13) * 1000 / host->timeout_clk;
394         while (current_timeout < target_timeout) {
395                 count++;
396                 current_timeout <<= 1;
397                 if (count >= 0xF)
398                         break;
399         }
400
401         if (count >= 0xF) {
402                 printk(KERN_WARNING "%s: Too large timeout requested!\n",
403                         mmc_hostname(host->mmc));
404                 count = 0xE;
405         }
406
407         writeb(count, host->ioaddr + SDHCI_TIMEOUT_CONTROL);
408
409         if (host->flags & SDHCI_USE_DMA) {
410                 int count;
411
412                 count = pci_map_sg(host->chip->pdev, data->sg, data->sg_len,
413                         (data->flags & MMC_DATA_READ)?PCI_DMA_FROMDEVICE:PCI_DMA_TODEVICE);
414                 BUG_ON(count != 1);
415
416                 writel(sg_dma_address(data->sg), host->ioaddr + SDHCI_DMA_ADDRESS);
417         } else {
418                 host->size = data->blksz * data->blocks;
419
420                 host->cur_sg = data->sg;
421                 host->num_sg = data->sg_len;
422
423                 host->offset = 0;
424                 host->remain = host->cur_sg->length;
425         }
426
427         /* We do not handle DMA boundaries, so set it to max (512 KiB) */
428         writew(SDHCI_MAKE_BLKSZ(7, data->blksz),
429                 host->ioaddr + SDHCI_BLOCK_SIZE);
430         writew(data->blocks, host->ioaddr + SDHCI_BLOCK_COUNT);
431 }
432
433 static void sdhci_set_transfer_mode(struct sdhci_host *host,
434         struct mmc_data *data)
435 {
436         u16 mode;
437
438         WARN_ON(host->data);
439
440         if (data == NULL)
441                 return;
442
443         mode = SDHCI_TRNS_BLK_CNT_EN;
444         if (data->blocks > 1)
445                 mode |= SDHCI_TRNS_MULTI;
446         if (data->flags & MMC_DATA_READ)
447                 mode |= SDHCI_TRNS_READ;
448         if (host->flags & SDHCI_USE_DMA)
449                 mode |= SDHCI_TRNS_DMA;
450
451         writew(mode, host->ioaddr + SDHCI_TRANSFER_MODE);
452 }
453
454 static void sdhci_finish_data(struct sdhci_host *host)
455 {
456         struct mmc_data *data;
457         u16 blocks;
458
459         BUG_ON(!host->data);
460
461         data = host->data;
462         host->data = NULL;
463
464         if (host->flags & SDHCI_USE_DMA) {
465                 pci_unmap_sg(host->chip->pdev, data->sg, data->sg_len,
466                         (data->flags & MMC_DATA_READ)?PCI_DMA_FROMDEVICE:PCI_DMA_TODEVICE);
467         }
468
469         /*
470          * Controller doesn't count down when in single block mode.
471          */
472         if ((data->blocks == 1) && (data->error == MMC_ERR_NONE))
473                 blocks = 0;
474         else
475                 blocks = readw(host->ioaddr + SDHCI_BLOCK_COUNT);
476         data->bytes_xfered = data->blksz * (data->blocks - blocks);
477
478         if ((data->error == MMC_ERR_NONE) && blocks) {
479                 printk(KERN_ERR "%s: Controller signalled completion even "
480                         "though there were blocks left. Please report this "
481                         "to " BUGMAIL ".\n", mmc_hostname(host->mmc));
482                 data->error = MMC_ERR_FAILED;
483         } else if (host->size != 0) {
484                 printk(KERN_ERR "%s: %d bytes were left untransferred. "
485                         "Please report this to " BUGMAIL ".\n",
486                         mmc_hostname(host->mmc), host->size);
487                 data->error = MMC_ERR_FAILED;
488         }
489
490         DBG("Ending data transfer (%d bytes)\n", data->bytes_xfered);
491
492         if (data->stop) {
493                 /*
494                  * The controller needs a reset of internal state machines
495                  * upon error conditions.
496                  */
497                 if (data->error != MMC_ERR_NONE) {
498                         sdhci_reset(host, SDHCI_RESET_CMD);
499                         sdhci_reset(host, SDHCI_RESET_DATA);
500                 }
501
502                 sdhci_send_command(host, data->stop);
503         } else
504                 tasklet_schedule(&host->finish_tasklet);
505 }
506
507 static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
508 {
509         int flags;
510         u32 mask;
511         unsigned long timeout;
512
513         WARN_ON(host->cmd);
514
515         DBG("Sending cmd (%x)\n", cmd->opcode);
516
517         /* Wait max 10 ms */
518         timeout = 10;
519
520         mask = SDHCI_CMD_INHIBIT;
521         if ((cmd->data != NULL) || (cmd->flags & MMC_RSP_BUSY))
522                 mask |= SDHCI_DATA_INHIBIT;
523
524         /* We shouldn't wait for data inihibit for stop commands, even
525            though they might use busy signaling */
526         if (host->mrq->data && (cmd == host->mrq->data->stop))
527                 mask &= ~SDHCI_DATA_INHIBIT;
528
529         while (readl(host->ioaddr + SDHCI_PRESENT_STATE) & mask) {
530                 if (timeout == 0) {
531                         printk(KERN_ERR "%s: Controller never released "
532                                 "inhibit bit(s). Please report this to "
533                                 BUGMAIL ".\n", mmc_hostname(host->mmc));
534                         sdhci_dumpregs(host);
535                         cmd->error = MMC_ERR_FAILED;
536                         tasklet_schedule(&host->finish_tasklet);
537                         return;
538                 }
539                 timeout--;
540                 mdelay(1);
541         }
542
543         mod_timer(&host->timer, jiffies + 10 * HZ);
544
545         host->cmd = cmd;
546
547         sdhci_prepare_data(host, cmd->data);
548
549         writel(cmd->arg, host->ioaddr + SDHCI_ARGUMENT);
550
551         sdhci_set_transfer_mode(host, cmd->data);
552
553         if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
554                 printk(KERN_ERR "%s: Unsupported response type! "
555                         "Please report this to " BUGMAIL ".\n",
556                         mmc_hostname(host->mmc));
557                 cmd->error = MMC_ERR_INVALID;
558                 tasklet_schedule(&host->finish_tasklet);
559                 return;
560         }
561
562         if (!(cmd->flags & MMC_RSP_PRESENT))
563                 flags = SDHCI_CMD_RESP_NONE;
564         else if (cmd->flags & MMC_RSP_136)
565                 flags = SDHCI_CMD_RESP_LONG;
566         else if (cmd->flags & MMC_RSP_BUSY)
567                 flags = SDHCI_CMD_RESP_SHORT_BUSY;
568         else
569                 flags = SDHCI_CMD_RESP_SHORT;
570
571         if (cmd->flags & MMC_RSP_CRC)
572                 flags |= SDHCI_CMD_CRC;
573         if (cmd->flags & MMC_RSP_OPCODE)
574                 flags |= SDHCI_CMD_INDEX;
575         if (cmd->data)
576                 flags |= SDHCI_CMD_DATA;
577
578         writew(SDHCI_MAKE_CMD(cmd->opcode, flags),
579                 host->ioaddr + SDHCI_COMMAND);
580 }
581
582 static void sdhci_finish_command(struct sdhci_host *host)
583 {
584         int i;
585
586         BUG_ON(host->cmd == NULL);
587
588         if (host->cmd->flags & MMC_RSP_PRESENT) {
589                 if (host->cmd->flags & MMC_RSP_136) {
590                         /* CRC is stripped so we need to do some shifting. */
591                         for (i = 0;i < 4;i++) {
592                                 host->cmd->resp[i] = readl(host->ioaddr +
593                                         SDHCI_RESPONSE + (3-i)*4) << 8;
594                                 if (i != 3)
595                                         host->cmd->resp[i] |=
596                                                 readb(host->ioaddr +
597                                                 SDHCI_RESPONSE + (3-i)*4-1);
598                         }
599                 } else {
600                         host->cmd->resp[0] = readl(host->ioaddr + SDHCI_RESPONSE);
601                 }
602         }
603
604         host->cmd->error = MMC_ERR_NONE;
605
606         DBG("Ending cmd (%x)\n", host->cmd->opcode);
607
608         if (host->cmd->data)
609                 host->data = host->cmd->data;
610         else
611                 tasklet_schedule(&host->finish_tasklet);
612
613         host->cmd = NULL;
614 }
615
616 static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
617 {
618         int div;
619         u8 ctrl;
620         u16 clk;
621         unsigned long timeout;
622
623         if (clock == host->clock)
624                 return;
625
626         writew(0, host->ioaddr + SDHCI_CLOCK_CONTROL);
627
628         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
629         if (clock > 25000000)
630                 ctrl |= SDHCI_CTRL_HISPD;
631         else
632                 ctrl &= ~SDHCI_CTRL_HISPD;
633         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
634
635         if (clock == 0)
636                 goto out;
637
638         for (div = 1;div < 256;div *= 2) {
639                 if ((host->max_clk / div) <= clock)
640                         break;
641         }
642         div >>= 1;
643
644         clk = div << SDHCI_DIVIDER_SHIFT;
645         clk |= SDHCI_CLOCK_INT_EN;
646         writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
647
648         /* Wait max 10 ms */
649         timeout = 10;
650         while (!((clk = readw(host->ioaddr + SDHCI_CLOCK_CONTROL))
651                 & SDHCI_CLOCK_INT_STABLE)) {
652                 if (timeout == 0) {
653                         printk(KERN_ERR "%s: Internal clock never stabilised. "
654                                 "Please report this to " BUGMAIL ".\n",
655                                 mmc_hostname(host->mmc));
656                         sdhci_dumpregs(host);
657                         return;
658                 }
659                 timeout--;
660                 mdelay(1);
661         }
662
663         clk |= SDHCI_CLOCK_CARD_EN;
664         writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
665
666 out:
667         host->clock = clock;
668 }
669
670 static void sdhci_set_power(struct sdhci_host *host, unsigned short power)
671 {
672         u8 pwr;
673
674         if (host->power == power)
675                 return;
676
677         writeb(0, host->ioaddr + SDHCI_POWER_CONTROL);
678
679         if (power == (unsigned short)-1)
680                 goto out;
681
682         pwr = SDHCI_POWER_ON;
683
684         switch (power) {
685         case MMC_VDD_170:
686         case MMC_VDD_180:
687         case MMC_VDD_190:
688                 pwr |= SDHCI_POWER_180;
689                 break;
690         case MMC_VDD_290:
691         case MMC_VDD_300:
692         case MMC_VDD_310:
693                 pwr |= SDHCI_POWER_300;
694                 break;
695         case MMC_VDD_320:
696         case MMC_VDD_330:
697         case MMC_VDD_340:
698                 pwr |= SDHCI_POWER_330;
699                 break;
700         default:
701                 BUG();
702         }
703
704         writeb(pwr, host->ioaddr + SDHCI_POWER_CONTROL);
705
706 out:
707         host->power = power;
708 }
709
710 /*****************************************************************************\
711  *                                                                           *
712  * MMC callbacks                                                             *
713  *                                                                           *
714 \*****************************************************************************/
715
716 static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
717 {
718         struct sdhci_host *host;
719         unsigned long flags;
720
721         host = mmc_priv(mmc);
722
723         spin_lock_irqsave(&host->lock, flags);
724
725         WARN_ON(host->mrq != NULL);
726
727         sdhci_activate_led(host);
728
729         host->mrq = mrq;
730
731         if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
732                 host->mrq->cmd->error = MMC_ERR_TIMEOUT;
733                 tasklet_schedule(&host->finish_tasklet);
734         } else
735                 sdhci_send_command(host, mrq->cmd);
736
737         mmiowb();
738         spin_unlock_irqrestore(&host->lock, flags);
739 }
740
741 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
742 {
743         struct sdhci_host *host;
744         unsigned long flags;
745         u8 ctrl;
746
747         host = mmc_priv(mmc);
748
749         spin_lock_irqsave(&host->lock, flags);
750
751         /*
752          * Reset the chip on each power off.
753          * Should clear out any weird states.
754          */
755         if (ios->power_mode == MMC_POWER_OFF) {
756                 writel(0, host->ioaddr + SDHCI_SIGNAL_ENABLE);
757                 sdhci_init(host);
758         }
759
760         sdhci_set_clock(host, ios->clock);
761
762         if (ios->power_mode == MMC_POWER_OFF)
763                 sdhci_set_power(host, -1);
764         else
765                 sdhci_set_power(host, ios->vdd);
766
767         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
768         if (ios->bus_width == MMC_BUS_WIDTH_4)
769                 ctrl |= SDHCI_CTRL_4BITBUS;
770         else
771                 ctrl &= ~SDHCI_CTRL_4BITBUS;
772         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
773
774         mmiowb();
775         spin_unlock_irqrestore(&host->lock, flags);
776 }
777
778 static int sdhci_get_ro(struct mmc_host *mmc)
779 {
780         struct sdhci_host *host;
781         unsigned long flags;
782         int present;
783
784         host = mmc_priv(mmc);
785
786         spin_lock_irqsave(&host->lock, flags);
787
788         present = readl(host->ioaddr + SDHCI_PRESENT_STATE);
789
790         spin_unlock_irqrestore(&host->lock, flags);
791
792         return !(present & SDHCI_WRITE_PROTECT);
793 }
794
795 static const struct mmc_host_ops sdhci_ops = {
796         .request        = sdhci_request,
797         .set_ios        = sdhci_set_ios,
798         .get_ro         = sdhci_get_ro,
799 };
800
801 /*****************************************************************************\
802  *                                                                           *
803  * Tasklets                                                                  *
804  *                                                                           *
805 \*****************************************************************************/
806
807 static void sdhci_tasklet_card(unsigned long param)
808 {
809         struct sdhci_host *host;
810         unsigned long flags;
811
812         host = (struct sdhci_host*)param;
813
814         spin_lock_irqsave(&host->lock, flags);
815
816         if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
817                 if (host->mrq) {
818                         printk(KERN_ERR "%s: Card removed during transfer!\n",
819                                 mmc_hostname(host->mmc));
820                         printk(KERN_ERR "%s: Resetting controller.\n",
821                                 mmc_hostname(host->mmc));
822
823                         sdhci_reset(host, SDHCI_RESET_CMD);
824                         sdhci_reset(host, SDHCI_RESET_DATA);
825
826                         host->mrq->cmd->error = MMC_ERR_FAILED;
827                         tasklet_schedule(&host->finish_tasklet);
828                 }
829         }
830
831         spin_unlock_irqrestore(&host->lock, flags);
832
833         mmc_detect_change(host->mmc, msecs_to_jiffies(500));
834 }
835
836 static void sdhci_tasklet_finish(unsigned long param)
837 {
838         struct sdhci_host *host;
839         unsigned long flags;
840         struct mmc_request *mrq;
841
842         host = (struct sdhci_host*)param;
843
844         spin_lock_irqsave(&host->lock, flags);
845
846         del_timer(&host->timer);
847
848         mrq = host->mrq;
849
850         DBG("Ending request, cmd (%x)\n", mrq->cmd->opcode);
851
852         /*
853          * The controller needs a reset of internal state machines
854          * upon error conditions.
855          */
856         if ((mrq->cmd->error != MMC_ERR_NONE) ||
857                 (mrq->data && ((mrq->data->error != MMC_ERR_NONE) ||
858                 (mrq->data->stop && (mrq->data->stop->error != MMC_ERR_NONE))))) {
859
860                 /* Some controllers need this kick or reset won't work here */
861                 if (host->chip->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET) {
862                         unsigned int clock;
863
864                         /* This is to force an update */
865                         clock = host->clock;
866                         host->clock = 0;
867                         sdhci_set_clock(host, clock);
868                 }
869
870                 /* Spec says we should do both at the same time, but Ricoh
871                    controllers do not like that. */
872                 sdhci_reset(host, SDHCI_RESET_CMD);
873                 sdhci_reset(host, SDHCI_RESET_DATA);
874         }
875
876         host->mrq = NULL;
877         host->cmd = NULL;
878         host->data = NULL;
879
880         sdhci_deactivate_led(host);
881
882         mmiowb();
883         spin_unlock_irqrestore(&host->lock, flags);
884
885         mmc_request_done(host->mmc, mrq);
886 }
887
888 static void sdhci_timeout_timer(unsigned long data)
889 {
890         struct sdhci_host *host;
891         unsigned long flags;
892
893         host = (struct sdhci_host*)data;
894
895         spin_lock_irqsave(&host->lock, flags);
896
897         if (host->mrq) {
898                 printk(KERN_ERR "%s: Timeout waiting for hardware interrupt. "
899                         "Please report this to " BUGMAIL ".\n",
900                         mmc_hostname(host->mmc));
901                 sdhci_dumpregs(host);
902
903                 if (host->data) {
904                         host->data->error = MMC_ERR_TIMEOUT;
905                         sdhci_finish_data(host);
906                 } else {
907                         if (host->cmd)
908                                 host->cmd->error = MMC_ERR_TIMEOUT;
909                         else
910                                 host->mrq->cmd->error = MMC_ERR_TIMEOUT;
911
912                         tasklet_schedule(&host->finish_tasklet);
913                 }
914         }
915
916         mmiowb();
917         spin_unlock_irqrestore(&host->lock, flags);
918 }
919
920 /*****************************************************************************\
921  *                                                                           *
922  * Interrupt handling                                                        *
923  *                                                                           *
924 \*****************************************************************************/
925
926 static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask)
927 {
928         BUG_ON(intmask == 0);
929
930         if (!host->cmd) {
931                 printk(KERN_ERR "%s: Got command interrupt even though no "
932                         "command operation was in progress.\n",
933                         mmc_hostname(host->mmc));
934                 printk(KERN_ERR "%s: Please report this to " BUGMAIL ".\n",
935                         mmc_hostname(host->mmc));
936                 sdhci_dumpregs(host);
937                 return;
938         }
939
940         if (intmask & SDHCI_INT_RESPONSE)
941                 sdhci_finish_command(host);
942         else {
943                 if (intmask & SDHCI_INT_TIMEOUT)
944                         host->cmd->error = MMC_ERR_TIMEOUT;
945                 else if (intmask & SDHCI_INT_CRC)
946                         host->cmd->error = MMC_ERR_BADCRC;
947                 else if (intmask & (SDHCI_INT_END_BIT | SDHCI_INT_INDEX))
948                         host->cmd->error = MMC_ERR_FAILED;
949                 else
950                         host->cmd->error = MMC_ERR_INVALID;
951
952                 tasklet_schedule(&host->finish_tasklet);
953         }
954 }
955
956 static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
957 {
958         BUG_ON(intmask == 0);
959
960         if (!host->data) {
961                 /*
962                  * A data end interrupt is sent together with the response
963                  * for the stop command.
964                  */
965                 if (intmask & SDHCI_INT_DATA_END)
966                         return;
967
968                 printk(KERN_ERR "%s: Got data interrupt even though no "
969                         "data operation was in progress.\n",
970                         mmc_hostname(host->mmc));
971                 printk(KERN_ERR "%s: Please report this to " BUGMAIL ".\n",
972                         mmc_hostname(host->mmc));
973                 sdhci_dumpregs(host);
974
975                 return;
976         }
977
978         if (intmask & SDHCI_INT_DATA_TIMEOUT)
979                 host->data->error = MMC_ERR_TIMEOUT;
980         else if (intmask & SDHCI_INT_DATA_CRC)
981                 host->data->error = MMC_ERR_BADCRC;
982         else if (intmask & SDHCI_INT_DATA_END_BIT)
983                 host->data->error = MMC_ERR_FAILED;
984
985         if (host->data->error != MMC_ERR_NONE)
986                 sdhci_finish_data(host);
987         else {
988                 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
989                         sdhci_transfer_pio(host);
990
991                 if (intmask & SDHCI_INT_DATA_END)
992                         sdhci_finish_data(host);
993         }
994 }
995
996 static irqreturn_t sdhci_irq(int irq, void *dev_id)
997 {
998         irqreturn_t result;
999         struct sdhci_host* host = dev_id;
1000         u32 intmask;
1001
1002         spin_lock(&host->lock);
1003
1004         intmask = readl(host->ioaddr + SDHCI_INT_STATUS);
1005
1006         if (!intmask) {
1007                 result = IRQ_NONE;
1008                 goto out;
1009         }
1010
1011         DBG("*** %s got interrupt: 0x%08x\n", host->slot_descr, intmask);
1012
1013         if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
1014                 writel(intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE),
1015                         host->ioaddr + SDHCI_INT_STATUS);
1016                 tasklet_schedule(&host->card_tasklet);
1017         }
1018
1019         intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE);
1020
1021         if (intmask & SDHCI_INT_CMD_MASK) {
1022                 writel(intmask & SDHCI_INT_CMD_MASK,
1023                         host->ioaddr + SDHCI_INT_STATUS);
1024                 sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK);
1025         }
1026
1027         if (intmask & SDHCI_INT_DATA_MASK) {
1028                 writel(intmask & SDHCI_INT_DATA_MASK,
1029                         host->ioaddr + SDHCI_INT_STATUS);
1030                 sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
1031         }
1032
1033         intmask &= ~(SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK);
1034
1035         if (intmask & SDHCI_INT_BUS_POWER) {
1036                 printk(KERN_ERR "%s: Card is consuming too much power!\n",
1037                         mmc_hostname(host->mmc));
1038                 writel(SDHCI_INT_BUS_POWER, host->ioaddr + SDHCI_INT_STATUS);
1039         }
1040
1041         intmask &= SDHCI_INT_BUS_POWER;
1042
1043         if (intmask) {
1044                 printk(KERN_ERR "%s: Unexpected interrupt 0x%08x. Please "
1045                         "report this to " BUGMAIL ".\n",
1046                         mmc_hostname(host->mmc), intmask);
1047                 sdhci_dumpregs(host);
1048
1049                 writel(intmask, host->ioaddr + SDHCI_INT_STATUS);
1050         }
1051
1052         result = IRQ_HANDLED;
1053
1054         mmiowb();
1055 out:
1056         spin_unlock(&host->lock);
1057
1058         return result;
1059 }
1060
1061 /*****************************************************************************\
1062  *                                                                           *
1063  * Suspend/resume                                                            *
1064  *                                                                           *
1065 \*****************************************************************************/
1066
1067 #ifdef CONFIG_PM
1068
1069 static int sdhci_suspend (struct pci_dev *pdev, pm_message_t state)
1070 {
1071         struct sdhci_chip *chip;
1072         int i, ret;
1073
1074         chip = pci_get_drvdata(pdev);
1075         if (!chip)
1076                 return 0;
1077
1078         DBG("Suspending...\n");
1079
1080         for (i = 0;i < chip->num_slots;i++) {
1081                 if (!chip->hosts[i])
1082                         continue;
1083                 ret = mmc_suspend_host(chip->hosts[i]->mmc, state);
1084                 if (ret) {
1085                         for (i--;i >= 0;i--)
1086                                 mmc_resume_host(chip->hosts[i]->mmc);
1087                         return ret;
1088                 }
1089         }
1090
1091         pci_save_state(pdev);
1092         pci_enable_wake(pdev, pci_choose_state(pdev, state), 0);
1093         pci_disable_device(pdev);
1094         pci_set_power_state(pdev, pci_choose_state(pdev, state));
1095
1096         return 0;
1097 }
1098
1099 static int sdhci_resume (struct pci_dev *pdev)
1100 {
1101         struct sdhci_chip *chip;
1102         int i, ret;
1103
1104         chip = pci_get_drvdata(pdev);
1105         if (!chip)
1106                 return 0;
1107
1108         DBG("Resuming...\n");
1109
1110         pci_set_power_state(pdev, PCI_D0);
1111         pci_restore_state(pdev);
1112         pci_enable_device(pdev);
1113
1114         for (i = 0;i < chip->num_slots;i++) {
1115                 if (!chip->hosts[i])
1116                         continue;
1117                 if (chip->hosts[i]->flags & SDHCI_USE_DMA)
1118                         pci_set_master(pdev);
1119                 sdhci_init(chip->hosts[i]);
1120                 mmiowb();
1121                 ret = mmc_resume_host(chip->hosts[i]->mmc);
1122                 if (ret)
1123                         return ret;
1124         }
1125
1126         return 0;
1127 }
1128
1129 #else /* CONFIG_PM */
1130
1131 #define sdhci_suspend NULL
1132 #define sdhci_resume NULL
1133
1134 #endif /* CONFIG_PM */
1135
1136 /*****************************************************************************\
1137  *                                                                           *
1138  * Device probing/removal                                                    *
1139  *                                                                           *
1140 \*****************************************************************************/
1141
1142 static int __devinit sdhci_probe_slot(struct pci_dev *pdev, int slot)
1143 {
1144         int ret;
1145         unsigned int version;
1146         struct sdhci_chip *chip;
1147         struct mmc_host *mmc;
1148         struct sdhci_host *host;
1149
1150         u8 first_bar;
1151         unsigned int caps;
1152
1153         chip = pci_get_drvdata(pdev);
1154         BUG_ON(!chip);
1155
1156         ret = pci_read_config_byte(pdev, PCI_SLOT_INFO, &first_bar);
1157         if (ret)
1158                 return ret;
1159
1160         first_bar &= PCI_SLOT_INFO_FIRST_BAR_MASK;
1161
1162         if (first_bar > 5) {
1163                 printk(KERN_ERR DRIVER_NAME ": Invalid first BAR. Aborting.\n");
1164                 return -ENODEV;
1165         }
1166
1167         if (!(pci_resource_flags(pdev, first_bar + slot) & IORESOURCE_MEM)) {
1168                 printk(KERN_ERR DRIVER_NAME ": BAR is not iomem. Aborting.\n");
1169                 return -ENODEV;
1170         }
1171
1172         if (pci_resource_len(pdev, first_bar + slot) != 0x100) {
1173                 printk(KERN_ERR DRIVER_NAME ": Invalid iomem size. "
1174                         "You may experience problems.\n");
1175         }
1176
1177         if ((pdev->class & 0x0000FF) == PCI_SDHCI_IFVENDOR) {
1178                 printk(KERN_ERR DRIVER_NAME ": Vendor specific interface. Aborting.\n");
1179                 return -ENODEV;
1180         }
1181
1182         if ((pdev->class & 0x0000FF) > PCI_SDHCI_IFVENDOR) {
1183                 printk(KERN_ERR DRIVER_NAME ": Unknown interface. Aborting.\n");
1184                 return -ENODEV;
1185         }
1186
1187         mmc = mmc_alloc_host(sizeof(struct sdhci_host), &pdev->dev);
1188         if (!mmc)
1189                 return -ENOMEM;
1190
1191         host = mmc_priv(mmc);
1192         host->mmc = mmc;
1193
1194         host->chip = chip;
1195         chip->hosts[slot] = host;
1196
1197         host->bar = first_bar + slot;
1198
1199         host->addr = pci_resource_start(pdev, host->bar);
1200         host->irq = pdev->irq;
1201
1202         DBG("slot %d at 0x%08lx, irq %d\n", slot, host->addr, host->irq);
1203
1204         snprintf(host->slot_descr, 20, "sdhci:slot%d", slot);
1205
1206         ret = pci_request_region(pdev, host->bar, host->slot_descr);
1207         if (ret)
1208                 goto free;
1209
1210         host->ioaddr = ioremap_nocache(host->addr,
1211                 pci_resource_len(pdev, host->bar));
1212         if (!host->ioaddr) {
1213                 ret = -ENOMEM;
1214                 goto release;
1215         }
1216
1217         sdhci_reset(host, SDHCI_RESET_ALL);
1218
1219         version = readw(host->ioaddr + SDHCI_HOST_VERSION);
1220         version = (version & SDHCI_SPEC_VER_MASK) >> SDHCI_SPEC_VER_SHIFT;
1221         if (version != 0) {
1222                 printk(KERN_ERR "%s: Unknown controller version (%d). "
1223                         "You may experience problems.\n", host->slot_descr,
1224                         version);
1225         }
1226
1227         caps = readl(host->ioaddr + SDHCI_CAPABILITIES);
1228
1229         if (debug_nodma)
1230                 DBG("DMA forced off\n");
1231         else if (debug_forcedma) {
1232                 DBG("DMA forced on\n");
1233                 host->flags |= SDHCI_USE_DMA;
1234         } else if (chip->quirks & SDHCI_QUIRK_FORCE_DMA)
1235                 host->flags |= SDHCI_USE_DMA;
1236         else if ((pdev->class & 0x0000FF) != PCI_SDHCI_IFDMA)
1237                 DBG("Controller doesn't have DMA interface\n");
1238         else if (!(caps & SDHCI_CAN_DO_DMA))
1239                 DBG("Controller doesn't have DMA capability\n");
1240         else
1241                 host->flags |= SDHCI_USE_DMA;
1242
1243         if (host->flags & SDHCI_USE_DMA) {
1244                 if (pci_set_dma_mask(pdev, DMA_32BIT_MASK)) {
1245                         printk(KERN_WARNING "%s: No suitable DMA available. "
1246                                 "Falling back to PIO.\n", host->slot_descr);
1247                         host->flags &= ~SDHCI_USE_DMA;
1248                 }
1249         }
1250
1251         if (host->flags & SDHCI_USE_DMA)
1252                 pci_set_master(pdev);
1253         else /* XXX: Hack to get MMC layer to avoid highmem */
1254                 pdev->dma_mask = 0;
1255
1256         host->max_clk =
1257                 (caps & SDHCI_CLOCK_BASE_MASK) >> SDHCI_CLOCK_BASE_SHIFT;
1258         if (host->max_clk == 0) {
1259                 printk(KERN_ERR "%s: Hardware doesn't specify base clock "
1260                         "frequency.\n", host->slot_descr);
1261                 ret = -ENODEV;
1262                 goto unmap;
1263         }
1264         host->max_clk *= 1000000;
1265
1266         host->timeout_clk =
1267                 (caps & SDHCI_TIMEOUT_CLK_MASK) >> SDHCI_TIMEOUT_CLK_SHIFT;
1268         if (host->timeout_clk == 0) {
1269                 printk(KERN_ERR "%s: Hardware doesn't specify timeout clock "
1270                         "frequency.\n", host->slot_descr);
1271                 ret = -ENODEV;
1272                 goto unmap;
1273         }
1274         if (caps & SDHCI_TIMEOUT_CLK_UNIT)
1275                 host->timeout_clk *= 1000;
1276
1277         host->max_block = (caps & SDHCI_MAX_BLOCK_MASK) >> SDHCI_MAX_BLOCK_SHIFT;
1278         if (host->max_block >= 3) {
1279                 printk(KERN_ERR "%s: Invalid maximum block size.\n",
1280                         host->slot_descr);
1281                 ret = -ENODEV;
1282                 goto unmap;
1283         }
1284         host->max_block = 512 << host->max_block;
1285
1286         /*
1287          * Set host parameters.
1288          */
1289         mmc->ops = &sdhci_ops;
1290         mmc->f_min = host->max_clk / 256;
1291         mmc->f_max = host->max_clk;
1292         mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_MULTIWRITE | MMC_CAP_BYTEBLOCK;
1293
1294         mmc->ocr_avail = 0;
1295         if (caps & SDHCI_CAN_VDD_330)
1296                 mmc->ocr_avail |= MMC_VDD_32_33|MMC_VDD_33_34;
1297         else if (caps & SDHCI_CAN_VDD_300)
1298                 mmc->ocr_avail |= MMC_VDD_29_30|MMC_VDD_30_31;
1299         else if (caps & SDHCI_CAN_VDD_180)
1300                 mmc->ocr_avail |= MMC_VDD_17_18|MMC_VDD_18_19;
1301
1302         if ((host->max_clk > 25000000) && !(caps & SDHCI_CAN_DO_HISPD)) {
1303                 printk(KERN_ERR "%s: Controller reports > 25 MHz base clock,"
1304                         " but no high speed support.\n",
1305                         host->slot_descr);
1306                 mmc->f_max = 25000000;
1307         }
1308
1309         if (mmc->ocr_avail == 0) {
1310                 printk(KERN_ERR "%s: Hardware doesn't report any "
1311                         "support voltages.\n", host->slot_descr);
1312                 ret = -ENODEV;
1313                 goto unmap;
1314         }
1315
1316         spin_lock_init(&host->lock);
1317
1318         /*
1319          * Maximum number of segments. Hardware cannot do scatter lists.
1320          */
1321         if (host->flags & SDHCI_USE_DMA)
1322                 mmc->max_hw_segs = 1;
1323         else
1324                 mmc->max_hw_segs = 16;
1325         mmc->max_phys_segs = 16;
1326
1327         /*
1328          * Maximum number of sectors in one transfer. Limited by DMA boundary
1329          * size (512KiB), which means (512 KiB/512=) 1024 entries.
1330          */
1331         mmc->max_sectors = 1024;
1332
1333         /*
1334          * Maximum segment size. Could be one segment with the maximum number
1335          * of sectors.
1336          */
1337         mmc->max_seg_size = mmc->max_sectors * 512;
1338
1339         /*
1340          * Init tasklets.
1341          */
1342         tasklet_init(&host->card_tasklet,
1343                 sdhci_tasklet_card, (unsigned long)host);
1344         tasklet_init(&host->finish_tasklet,
1345                 sdhci_tasklet_finish, (unsigned long)host);
1346
1347         setup_timer(&host->timer, sdhci_timeout_timer, (unsigned long)host);
1348
1349         ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
1350                 host->slot_descr, host);
1351         if (ret)
1352                 goto untasklet;
1353
1354         sdhci_init(host);
1355
1356 #ifdef CONFIG_MMC_DEBUG
1357         sdhci_dumpregs(host);
1358 #endif
1359
1360         mmiowb();
1361
1362         mmc_add_host(mmc);
1363
1364         printk(KERN_INFO "%s: SDHCI at 0x%08lx irq %d %s\n", mmc_hostname(mmc),
1365                 host->addr, host->irq,
1366                 (host->flags & SDHCI_USE_DMA)?"DMA":"PIO");
1367
1368         return 0;
1369
1370 untasklet:
1371         tasklet_kill(&host->card_tasklet);
1372         tasklet_kill(&host->finish_tasklet);
1373 unmap:
1374         iounmap(host->ioaddr);
1375 release:
1376         pci_release_region(pdev, host->bar);
1377 free:
1378         mmc_free_host(mmc);
1379
1380         return ret;
1381 }
1382
1383 static void sdhci_remove_slot(struct pci_dev *pdev, int slot)
1384 {
1385         struct sdhci_chip *chip;
1386         struct mmc_host *mmc;
1387         struct sdhci_host *host;
1388
1389         chip = pci_get_drvdata(pdev);
1390         host = chip->hosts[slot];
1391         mmc = host->mmc;
1392
1393         chip->hosts[slot] = NULL;
1394
1395         mmc_remove_host(mmc);
1396
1397         sdhci_reset(host, SDHCI_RESET_ALL);
1398
1399         free_irq(host->irq, host);
1400
1401         del_timer_sync(&host->timer);
1402
1403         tasklet_kill(&host->card_tasklet);
1404         tasklet_kill(&host->finish_tasklet);
1405
1406         iounmap(host->ioaddr);
1407
1408         pci_release_region(pdev, host->bar);
1409
1410         mmc_free_host(mmc);
1411 }
1412
1413 static int __devinit sdhci_probe(struct pci_dev *pdev,
1414         const struct pci_device_id *ent)
1415 {
1416         int ret, i;
1417         u8 slots, rev;
1418         struct sdhci_chip *chip;
1419
1420         BUG_ON(pdev == NULL);
1421         BUG_ON(ent == NULL);
1422
1423         pci_read_config_byte(pdev, PCI_CLASS_REVISION, &rev);
1424
1425         printk(KERN_INFO DRIVER_NAME
1426                 ": SDHCI controller found at %s [%04x:%04x] (rev %x)\n",
1427                 pci_name(pdev), (int)pdev->vendor, (int)pdev->device,
1428                 (int)rev);
1429
1430         ret = pci_read_config_byte(pdev, PCI_SLOT_INFO, &slots);
1431         if (ret)
1432                 return ret;
1433
1434         slots = PCI_SLOT_INFO_SLOTS(slots) + 1;
1435         DBG("found %d slot(s)\n", slots);
1436         if (slots == 0)
1437                 return -ENODEV;
1438
1439         ret = pci_enable_device(pdev);
1440         if (ret)
1441                 return ret;
1442
1443         chip = kzalloc(sizeof(struct sdhci_chip) +
1444                 sizeof(struct sdhci_host*) * slots, GFP_KERNEL);
1445         if (!chip) {
1446                 ret = -ENOMEM;
1447                 goto err;
1448         }
1449
1450         chip->pdev = pdev;
1451         chip->quirks = ent->driver_data;
1452
1453         if (debug_quirks)
1454                 chip->quirks = debug_quirks;
1455
1456         chip->num_slots = slots;
1457         pci_set_drvdata(pdev, chip);
1458
1459         for (i = 0;i < slots;i++) {
1460                 ret = sdhci_probe_slot(pdev, i);
1461                 if (ret) {
1462                         for (i--;i >= 0;i--)
1463                                 sdhci_remove_slot(pdev, i);
1464                         goto free;
1465                 }
1466         }
1467
1468         return 0;
1469
1470 free:
1471         pci_set_drvdata(pdev, NULL);
1472         kfree(chip);
1473
1474 err:
1475         pci_disable_device(pdev);
1476         return ret;
1477 }
1478
1479 static void __devexit sdhci_remove(struct pci_dev *pdev)
1480 {
1481         int i;
1482         struct sdhci_chip *chip;
1483
1484         chip = pci_get_drvdata(pdev);
1485
1486         if (chip) {
1487                 for (i = 0;i < chip->num_slots;i++)
1488                         sdhci_remove_slot(pdev, i);
1489
1490                 pci_set_drvdata(pdev, NULL);
1491
1492                 kfree(chip);
1493         }
1494
1495         pci_disable_device(pdev);
1496 }
1497
1498 static struct pci_driver sdhci_driver = {
1499         .name =         DRIVER_NAME,
1500         .id_table =     pci_ids,
1501         .probe =        sdhci_probe,
1502         .remove =       __devexit_p(sdhci_remove),
1503         .suspend =      sdhci_suspend,
1504         .resume =       sdhci_resume,
1505 };
1506
1507 /*****************************************************************************\
1508  *                                                                           *
1509  * Driver init/exit                                                          *
1510  *                                                                           *
1511 \*****************************************************************************/
1512
1513 static int __init sdhci_drv_init(void)
1514 {
1515         printk(KERN_INFO DRIVER_NAME
1516                 ": Secure Digital Host Controller Interface driver, "
1517                 DRIVER_VERSION "\n");
1518         printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1519
1520         return pci_register_driver(&sdhci_driver);
1521 }
1522
1523 static void __exit sdhci_drv_exit(void)
1524 {
1525         DBG("Exiting\n");
1526
1527         pci_unregister_driver(&sdhci_driver);
1528 }
1529
1530 module_init(sdhci_drv_init);
1531 module_exit(sdhci_drv_exit);
1532
1533 module_param(debug_nodma, uint, 0444);
1534 module_param(debug_forcedma, uint, 0444);
1535 module_param(debug_quirks, uint, 0444);
1536
1537 MODULE_AUTHOR("Pierre Ossman <drzeus@drzeus.cx>");
1538 MODULE_DESCRIPTION("Secure Digital Host Controller Interface driver");
1539 MODULE_VERSION(DRIVER_VERSION);
1540 MODULE_LICENSE("GPL");
1541
1542 MODULE_PARM_DESC(debug_nodma, "Forcefully disable DMA transfers. (default 0)");
1543 MODULE_PARM_DESC(debug_forcedma, "Forcefully enable DMA transfers. (default 0)");
1544 MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");