]> bbs.cooldavid.org Git - net-next-2.6.git/blob - drivers/mmc/host/pxamci.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg...
[net-next-2.6.git] / drivers / mmc / host / pxamci.c
1 /*
2  *  linux/drivers/mmc/host/pxa.c - PXA MMCI driver
3  *
4  *  Copyright (C) 2003 Russell King, 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  *  This hardware is really sick:
11  *   - No way to clear interrupts.
12  *   - Have to turn off the clock whenever we touch the device.
13  *   - Doesn't tell you how many data blocks were transferred.
14  *  Yuck!
15  *
16  *      1 and 3 byte data transfers not supported
17  *      max block length up to 1023
18  */
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/ioport.h>
22 #include <linux/platform_device.h>
23 #include <linux/delay.h>
24 #include <linux/interrupt.h>
25 #include <linux/dma-mapping.h>
26 #include <linux/clk.h>
27 #include <linux/err.h>
28 #include <linux/mmc/host.h>
29 #include <linux/io.h>
30
31 #include <asm/sizes.h>
32
33 #include <mach/dma.h>
34 #include <mach/hardware.h>
35 #include <mach/pxa-regs.h>
36 #include <mach/mmc.h>
37
38 #include "pxamci.h"
39
40 #define DRIVER_NAME     "pxa2xx-mci"
41
42 #define NR_SG   1
43 #define CLKRT_OFF       (~0)
44
45 struct pxamci_host {
46         struct mmc_host         *mmc;
47         spinlock_t              lock;
48         struct resource         *res;
49         void __iomem            *base;
50         struct clk              *clk;
51         unsigned long           clkrate;
52         int                     irq;
53         int                     dma;
54         unsigned int            clkrt;
55         unsigned int            cmdat;
56         unsigned int            imask;
57         unsigned int            power_mode;
58         struct pxamci_platform_data *pdata;
59
60         struct mmc_request      *mrq;
61         struct mmc_command      *cmd;
62         struct mmc_data         *data;
63
64         dma_addr_t              sg_dma;
65         struct pxa_dma_desc     *sg_cpu;
66         unsigned int            dma_len;
67
68         unsigned int            dma_dir;
69         unsigned int            dma_drcmrrx;
70         unsigned int            dma_drcmrtx;
71 };
72
73 static void pxamci_stop_clock(struct pxamci_host *host)
74 {
75         if (readl(host->base + MMC_STAT) & STAT_CLK_EN) {
76                 unsigned long timeout = 10000;
77                 unsigned int v;
78
79                 writel(STOP_CLOCK, host->base + MMC_STRPCL);
80
81                 do {
82                         v = readl(host->base + MMC_STAT);
83                         if (!(v & STAT_CLK_EN))
84                                 break;
85                         udelay(1);
86                 } while (timeout--);
87
88                 if (v & STAT_CLK_EN)
89                         dev_err(mmc_dev(host->mmc), "unable to stop clock\n");
90         }
91 }
92
93 static void pxamci_enable_irq(struct pxamci_host *host, unsigned int mask)
94 {
95         unsigned long flags;
96
97         spin_lock_irqsave(&host->lock, flags);
98         host->imask &= ~mask;
99         writel(host->imask, host->base + MMC_I_MASK);
100         spin_unlock_irqrestore(&host->lock, flags);
101 }
102
103 static void pxamci_disable_irq(struct pxamci_host *host, unsigned int mask)
104 {
105         unsigned long flags;
106
107         spin_lock_irqsave(&host->lock, flags);
108         host->imask |= mask;
109         writel(host->imask, host->base + MMC_I_MASK);
110         spin_unlock_irqrestore(&host->lock, flags);
111 }
112
113 static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data)
114 {
115         unsigned int nob = data->blocks;
116         unsigned long long clks;
117         unsigned int timeout;
118         bool dalgn = 0;
119         u32 dcmd;
120         int i;
121
122         host->data = data;
123
124         if (data->flags & MMC_DATA_STREAM)
125                 nob = 0xffff;
126
127         writel(nob, host->base + MMC_NOB);
128         writel(data->blksz, host->base + MMC_BLKLEN);
129
130         clks = (unsigned long long)data->timeout_ns * host->clkrate;
131         do_div(clks, 1000000000UL);
132         timeout = (unsigned int)clks + (data->timeout_clks << host->clkrt);
133         writel((timeout + 255) / 256, host->base + MMC_RDTO);
134
135         if (data->flags & MMC_DATA_READ) {
136                 host->dma_dir = DMA_FROM_DEVICE;
137                 dcmd = DCMD_INCTRGADDR | DCMD_FLOWTRG;
138                 DRCMR(host->dma_drcmrtx) = 0;
139                 DRCMR(host->dma_drcmrrx) = host->dma | DRCMR_MAPVLD;
140         } else {
141                 host->dma_dir = DMA_TO_DEVICE;
142                 dcmd = DCMD_INCSRCADDR | DCMD_FLOWSRC;
143                 DRCMR(host->dma_drcmrrx) = 0;
144                 DRCMR(host->dma_drcmrtx) = host->dma | DRCMR_MAPVLD;
145         }
146
147         dcmd |= DCMD_BURST32 | DCMD_WIDTH1;
148
149         host->dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
150                                    host->dma_dir);
151
152         for (i = 0; i < host->dma_len; i++) {
153                 unsigned int length = sg_dma_len(&data->sg[i]);
154                 host->sg_cpu[i].dcmd = dcmd | length;
155                 if (length & 31 && !(data->flags & MMC_DATA_READ))
156                         host->sg_cpu[i].dcmd |= DCMD_ENDIRQEN;
157                 /* Not aligned to 8-byte boundary? */
158                 if (sg_dma_address(&data->sg[i]) & 0x7)
159                         dalgn = 1;
160                 if (data->flags & MMC_DATA_READ) {
161                         host->sg_cpu[i].dsadr = host->res->start + MMC_RXFIFO;
162                         host->sg_cpu[i].dtadr = sg_dma_address(&data->sg[i]);
163                 } else {
164                         host->sg_cpu[i].dsadr = sg_dma_address(&data->sg[i]);
165                         host->sg_cpu[i].dtadr = host->res->start + MMC_TXFIFO;
166                 }
167                 host->sg_cpu[i].ddadr = host->sg_dma + (i + 1) *
168                                         sizeof(struct pxa_dma_desc);
169         }
170         host->sg_cpu[host->dma_len - 1].ddadr = DDADR_STOP;
171         wmb();
172
173         /*
174          * The PXA27x DMA controller encounters overhead when working with
175          * unaligned (to 8-byte boundaries) data, so switch on byte alignment
176          * mode only if we have unaligned data.
177          */
178         if (dalgn)
179                 DALGN |= (1 << host->dma);
180         else
181                 DALGN &= ~(1 << host->dma);
182         DDADR(host->dma) = host->sg_dma;
183
184         /*
185          * workaround for erratum #91:
186          * only start DMA now if we are doing a read,
187          * otherwise we wait until CMD/RESP has finished
188          * before starting DMA.
189          */
190         if (!cpu_is_pxa27x() || data->flags & MMC_DATA_READ)
191                 DCSR(host->dma) = DCSR_RUN;
192 }
193
194 static void pxamci_start_cmd(struct pxamci_host *host, struct mmc_command *cmd, unsigned int cmdat)
195 {
196         WARN_ON(host->cmd != NULL);
197         host->cmd = cmd;
198
199         if (cmd->flags & MMC_RSP_BUSY)
200                 cmdat |= CMDAT_BUSY;
201
202 #define RSP_TYPE(x)     ((x) & ~(MMC_RSP_BUSY|MMC_RSP_OPCODE))
203         switch (RSP_TYPE(mmc_resp_type(cmd))) {
204         case RSP_TYPE(MMC_RSP_R1): /* r1, r1b, r6, r7 */
205                 cmdat |= CMDAT_RESP_SHORT;
206                 break;
207         case RSP_TYPE(MMC_RSP_R3):
208                 cmdat |= CMDAT_RESP_R3;
209                 break;
210         case RSP_TYPE(MMC_RSP_R2):
211                 cmdat |= CMDAT_RESP_R2;
212                 break;
213         default:
214                 break;
215         }
216
217         writel(cmd->opcode, host->base + MMC_CMD);
218         writel(cmd->arg >> 16, host->base + MMC_ARGH);
219         writel(cmd->arg & 0xffff, host->base + MMC_ARGL);
220         writel(cmdat, host->base + MMC_CMDAT);
221         writel(host->clkrt, host->base + MMC_CLKRT);
222
223         writel(START_CLOCK, host->base + MMC_STRPCL);
224
225         pxamci_enable_irq(host, END_CMD_RES);
226 }
227
228 static void pxamci_finish_request(struct pxamci_host *host, struct mmc_request *mrq)
229 {
230         host->mrq = NULL;
231         host->cmd = NULL;
232         host->data = NULL;
233         mmc_request_done(host->mmc, mrq);
234 }
235
236 static int pxamci_cmd_done(struct pxamci_host *host, unsigned int stat)
237 {
238         struct mmc_command *cmd = host->cmd;
239         int i;
240         u32 v;
241
242         if (!cmd)
243                 return 0;
244
245         host->cmd = NULL;
246
247         /*
248          * Did I mention this is Sick.  We always need to
249          * discard the upper 8 bits of the first 16-bit word.
250          */
251         v = readl(host->base + MMC_RES) & 0xffff;
252         for (i = 0; i < 4; i++) {
253                 u32 w1 = readl(host->base + MMC_RES) & 0xffff;
254                 u32 w2 = readl(host->base + MMC_RES) & 0xffff;
255                 cmd->resp[i] = v << 24 | w1 << 8 | w2 >> 8;
256                 v = w2;
257         }
258
259         if (stat & STAT_TIME_OUT_RESPONSE) {
260                 cmd->error = -ETIMEDOUT;
261         } else if (stat & STAT_RES_CRC_ERR && cmd->flags & MMC_RSP_CRC) {
262                 /*
263                  * workaround for erratum #42:
264                  * Intel PXA27x Family Processor Specification Update Rev 001
265                  * A bogus CRC error can appear if the msb of a 136 bit
266                  * response is a one.
267                  */
268                 if (cpu_is_pxa27x() &&
269                     (cmd->flags & MMC_RSP_136 && cmd->resp[0] & 0x80000000))
270                         pr_debug("ignoring CRC from command %d - *risky*\n", cmd->opcode);
271                 else
272                         cmd->error = -EILSEQ;
273         }
274
275         pxamci_disable_irq(host, END_CMD_RES);
276         if (host->data && !cmd->error) {
277                 pxamci_enable_irq(host, DATA_TRAN_DONE);
278                 /*
279                  * workaround for erratum #91, if doing write
280                  * enable DMA late
281                  */
282                 if (cpu_is_pxa27x() && host->data->flags & MMC_DATA_WRITE)
283                         DCSR(host->dma) = DCSR_RUN;
284         } else {
285                 pxamci_finish_request(host, host->mrq);
286         }
287
288         return 1;
289 }
290
291 static int pxamci_data_done(struct pxamci_host *host, unsigned int stat)
292 {
293         struct mmc_data *data = host->data;
294
295         if (!data)
296                 return 0;
297
298         DCSR(host->dma) = 0;
299         dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
300                      host->dma_dir);
301
302         if (stat & STAT_READ_TIME_OUT)
303                 data->error = -ETIMEDOUT;
304         else if (stat & (STAT_CRC_READ_ERROR|STAT_CRC_WRITE_ERROR))
305                 data->error = -EILSEQ;
306
307         /*
308          * There appears to be a hardware design bug here.  There seems to
309          * be no way to find out how much data was transferred to the card.
310          * This means that if there was an error on any block, we mark all
311          * data blocks as being in error.
312          */
313         if (!data->error)
314                 data->bytes_xfered = data->blocks * data->blksz;
315         else
316                 data->bytes_xfered = 0;
317
318         pxamci_disable_irq(host, DATA_TRAN_DONE);
319
320         host->data = NULL;
321         if (host->mrq->stop) {
322                 pxamci_stop_clock(host);
323                 pxamci_start_cmd(host, host->mrq->stop, host->cmdat);
324         } else {
325                 pxamci_finish_request(host, host->mrq);
326         }
327
328         return 1;
329 }
330
331 static irqreturn_t pxamci_irq(int irq, void *devid)
332 {
333         struct pxamci_host *host = devid;
334         unsigned int ireg;
335         int handled = 0;
336
337         ireg = readl(host->base + MMC_I_REG) & ~readl(host->base + MMC_I_MASK);
338
339         if (ireg) {
340                 unsigned stat = readl(host->base + MMC_STAT);
341
342                 pr_debug("PXAMCI: irq %08x stat %08x\n", ireg, stat);
343
344                 if (ireg & END_CMD_RES)
345                         handled |= pxamci_cmd_done(host, stat);
346                 if (ireg & DATA_TRAN_DONE)
347                         handled |= pxamci_data_done(host, stat);
348                 if (ireg & SDIO_INT) {
349                         mmc_signal_sdio_irq(host->mmc);
350                         handled = 1;
351                 }
352         }
353
354         return IRQ_RETVAL(handled);
355 }
356
357 static void pxamci_request(struct mmc_host *mmc, struct mmc_request *mrq)
358 {
359         struct pxamci_host *host = mmc_priv(mmc);
360         unsigned int cmdat;
361
362         WARN_ON(host->mrq != NULL);
363
364         host->mrq = mrq;
365
366         pxamci_stop_clock(host);
367
368         cmdat = host->cmdat;
369         host->cmdat &= ~CMDAT_INIT;
370
371         if (mrq->data) {
372                 pxamci_setup_data(host, mrq->data);
373
374                 cmdat &= ~CMDAT_BUSY;
375                 cmdat |= CMDAT_DATAEN | CMDAT_DMAEN;
376                 if (mrq->data->flags & MMC_DATA_WRITE)
377                         cmdat |= CMDAT_WRITE;
378
379                 if (mrq->data->flags & MMC_DATA_STREAM)
380                         cmdat |= CMDAT_STREAM;
381         }
382
383         pxamci_start_cmd(host, mrq->cmd, cmdat);
384 }
385
386 static int pxamci_get_ro(struct mmc_host *mmc)
387 {
388         struct pxamci_host *host = mmc_priv(mmc);
389
390         if (host->pdata && host->pdata->get_ro)
391                 return !!host->pdata->get_ro(mmc_dev(mmc));
392         /*
393          * Board doesn't support read only detection; let the mmc core
394          * decide what to do.
395          */
396         return -ENOSYS;
397 }
398
399 static void pxamci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
400 {
401         struct pxamci_host *host = mmc_priv(mmc);
402
403         if (ios->clock) {
404                 unsigned long rate = host->clkrate;
405                 unsigned int clk = rate / ios->clock;
406
407                 if (host->clkrt == CLKRT_OFF)
408                         clk_enable(host->clk);
409
410                 if (ios->clock == 26000000) {
411                         /* to support 26MHz on pxa300/pxa310 */
412                         host->clkrt = 7;
413                 } else {
414                         /* to handle (19.5MHz, 26MHz) */
415                         if (!clk)
416                                 clk = 1;
417
418                         /*
419                          * clk might result in a lower divisor than we
420                          * desire.  check for that condition and adjust
421                          * as appropriate.
422                          */
423                         if (rate / clk > ios->clock)
424                                 clk <<= 1;
425                         host->clkrt = fls(clk) - 1;
426                 }
427
428                 /*
429                  * we write clkrt on the next command
430                  */
431         } else {
432                 pxamci_stop_clock(host);
433                 if (host->clkrt != CLKRT_OFF) {
434                         host->clkrt = CLKRT_OFF;
435                         clk_disable(host->clk);
436                 }
437         }
438
439         if (host->power_mode != ios->power_mode) {
440                 host->power_mode = ios->power_mode;
441
442                 if (host->pdata && host->pdata->setpower)
443                         host->pdata->setpower(mmc_dev(mmc), ios->vdd);
444
445                 if (ios->power_mode == MMC_POWER_ON)
446                         host->cmdat |= CMDAT_INIT;
447         }
448
449         if (ios->bus_width == MMC_BUS_WIDTH_4)
450                 host->cmdat |= CMDAT_SD_4DAT;
451         else
452                 host->cmdat &= ~CMDAT_SD_4DAT;
453
454         pr_debug("PXAMCI: clkrt = %x cmdat = %x\n",
455                  host->clkrt, host->cmdat);
456 }
457
458 static void pxamci_enable_sdio_irq(struct mmc_host *host, int enable)
459 {
460         struct pxamci_host *pxa_host = mmc_priv(host);
461
462         if (enable)
463                 pxamci_enable_irq(pxa_host, SDIO_INT);
464         else
465                 pxamci_disable_irq(pxa_host, SDIO_INT);
466 }
467
468 static const struct mmc_host_ops pxamci_ops = {
469         .request                = pxamci_request,
470         .get_ro                 = pxamci_get_ro,
471         .set_ios                = pxamci_set_ios,
472         .enable_sdio_irq        = pxamci_enable_sdio_irq,
473 };
474
475 static void pxamci_dma_irq(int dma, void *devid)
476 {
477         struct pxamci_host *host = devid;
478         int dcsr = DCSR(dma);
479         DCSR(dma) = dcsr & ~DCSR_STOPIRQEN;
480
481         if (dcsr & DCSR_ENDINTR) {
482                 writel(BUF_PART_FULL, host->base + MMC_PRTBUF);
483         } else {
484                 printk(KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
485                        mmc_hostname(host->mmc), dma, dcsr);
486                 host->data->error = -EIO;
487                 pxamci_data_done(host, 0);
488         }
489 }
490
491 static irqreturn_t pxamci_detect_irq(int irq, void *devid)
492 {
493         struct pxamci_host *host = mmc_priv(devid);
494
495         mmc_detect_change(devid, host->pdata->detect_delay);
496         return IRQ_HANDLED;
497 }
498
499 static int pxamci_probe(struct platform_device *pdev)
500 {
501         struct mmc_host *mmc;
502         struct pxamci_host *host = NULL;
503         struct resource *r, *dmarx, *dmatx;
504         int ret, irq;
505
506         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
507         irq = platform_get_irq(pdev, 0);
508         if (!r || irq < 0)
509                 return -ENXIO;
510
511         r = request_mem_region(r->start, SZ_4K, DRIVER_NAME);
512         if (!r)
513                 return -EBUSY;
514
515         mmc = mmc_alloc_host(sizeof(struct pxamci_host), &pdev->dev);
516         if (!mmc) {
517                 ret = -ENOMEM;
518                 goto out;
519         }
520
521         mmc->ops = &pxamci_ops;
522
523         /*
524          * We can do SG-DMA, but we don't because we never know how much
525          * data we successfully wrote to the card.
526          */
527         mmc->max_phys_segs = NR_SG;
528
529         /*
530          * Our hardware DMA can handle a maximum of one page per SG entry.
531          */
532         mmc->max_seg_size = PAGE_SIZE;
533
534         /*
535          * Block length register is only 10 bits before PXA27x.
536          */
537         mmc->max_blk_size = cpu_is_pxa25x() ? 1023 : 2048;
538
539         /*
540          * Block count register is 16 bits.
541          */
542         mmc->max_blk_count = 65535;
543
544         host = mmc_priv(mmc);
545         host->mmc = mmc;
546         host->dma = -1;
547         host->pdata = pdev->dev.platform_data;
548         host->clkrt = CLKRT_OFF;
549
550         host->clk = clk_get(&pdev->dev, NULL);
551         if (IS_ERR(host->clk)) {
552                 ret = PTR_ERR(host->clk);
553                 host->clk = NULL;
554                 goto out;
555         }
556
557         host->clkrate = clk_get_rate(host->clk);
558
559         /*
560          * Calculate minimum clock rate, rounding up.
561          */
562         mmc->f_min = (host->clkrate + 63) / 64;
563         mmc->f_max = (cpu_is_pxa300() || cpu_is_pxa310()) ? 26000000
564                                                           : host->clkrate;
565
566         mmc->ocr_avail = host->pdata ?
567                          host->pdata->ocr_mask :
568                          MMC_VDD_32_33|MMC_VDD_33_34;
569         mmc->caps = 0;
570         host->cmdat = 0;
571         if (!cpu_is_pxa25x()) {
572                 mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
573                 host->cmdat |= CMDAT_SDIO_INT_EN;
574                 if (cpu_is_pxa300() || cpu_is_pxa310())
575                         mmc->caps |= MMC_CAP_MMC_HIGHSPEED |
576                                      MMC_CAP_SD_HIGHSPEED;
577         }
578
579         host->sg_cpu = dma_alloc_coherent(&pdev->dev, PAGE_SIZE, &host->sg_dma, GFP_KERNEL);
580         if (!host->sg_cpu) {
581                 ret = -ENOMEM;
582                 goto out;
583         }
584
585         spin_lock_init(&host->lock);
586         host->res = r;
587         host->irq = irq;
588         host->imask = MMC_I_MASK_ALL;
589
590         host->base = ioremap(r->start, SZ_4K);
591         if (!host->base) {
592                 ret = -ENOMEM;
593                 goto out;
594         }
595
596         /*
597          * Ensure that the host controller is shut down, and setup
598          * with our defaults.
599          */
600         pxamci_stop_clock(host);
601         writel(0, host->base + MMC_SPI);
602         writel(64, host->base + MMC_RESTO);
603         writel(host->imask, host->base + MMC_I_MASK);
604
605         host->dma = pxa_request_dma(DRIVER_NAME, DMA_PRIO_LOW,
606                                     pxamci_dma_irq, host);
607         if (host->dma < 0) {
608                 ret = -EBUSY;
609                 goto out;
610         }
611
612         ret = request_irq(host->irq, pxamci_irq, 0, DRIVER_NAME, host);
613         if (ret)
614                 goto out;
615
616         platform_set_drvdata(pdev, mmc);
617
618         dmarx = platform_get_resource(pdev, IORESOURCE_DMA, 0);
619         if (!dmarx) {
620                 ret = -ENXIO;
621                 goto out;
622         }
623         host->dma_drcmrrx = dmarx->start;
624
625         dmatx = platform_get_resource(pdev, IORESOURCE_DMA, 1);
626         if (!dmatx) {
627                 ret = -ENXIO;
628                 goto out;
629         }
630         host->dma_drcmrtx = dmatx->start;
631
632         if (host->pdata && host->pdata->init)
633                 host->pdata->init(&pdev->dev, pxamci_detect_irq, mmc);
634
635         mmc_add_host(mmc);
636
637         return 0;
638
639  out:
640         if (host) {
641                 if (host->dma >= 0)
642                         pxa_free_dma(host->dma);
643                 if (host->base)
644                         iounmap(host->base);
645                 if (host->sg_cpu)
646                         dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
647                 if (host->clk)
648                         clk_put(host->clk);
649         }
650         if (mmc)
651                 mmc_free_host(mmc);
652         release_resource(r);
653         return ret;
654 }
655
656 static int pxamci_remove(struct platform_device *pdev)
657 {
658         struct mmc_host *mmc = platform_get_drvdata(pdev);
659
660         platform_set_drvdata(pdev, NULL);
661
662         if (mmc) {
663                 struct pxamci_host *host = mmc_priv(mmc);
664
665                 if (host->pdata && host->pdata->exit)
666                         host->pdata->exit(&pdev->dev, mmc);
667
668                 mmc_remove_host(mmc);
669
670                 pxamci_stop_clock(host);
671                 writel(TXFIFO_WR_REQ|RXFIFO_RD_REQ|CLK_IS_OFF|STOP_CMD|
672                        END_CMD_RES|PRG_DONE|DATA_TRAN_DONE,
673                        host->base + MMC_I_MASK);
674
675                 DRCMR(host->dma_drcmrrx) = 0;
676                 DRCMR(host->dma_drcmrtx) = 0;
677
678                 free_irq(host->irq, host);
679                 pxa_free_dma(host->dma);
680                 iounmap(host->base);
681                 dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
682
683                 clk_put(host->clk);
684
685                 release_resource(host->res);
686
687                 mmc_free_host(mmc);
688         }
689         return 0;
690 }
691
692 #ifdef CONFIG_PM
693 static int pxamci_suspend(struct platform_device *dev, pm_message_t state)
694 {
695         struct mmc_host *mmc = platform_get_drvdata(dev);
696         int ret = 0;
697
698         if (mmc)
699                 ret = mmc_suspend_host(mmc, state);
700
701         return ret;
702 }
703
704 static int pxamci_resume(struct platform_device *dev)
705 {
706         struct mmc_host *mmc = platform_get_drvdata(dev);
707         int ret = 0;
708
709         if (mmc)
710                 ret = mmc_resume_host(mmc);
711
712         return ret;
713 }
714 #else
715 #define pxamci_suspend  NULL
716 #define pxamci_resume   NULL
717 #endif
718
719 static struct platform_driver pxamci_driver = {
720         .probe          = pxamci_probe,
721         .remove         = pxamci_remove,
722         .suspend        = pxamci_suspend,
723         .resume         = pxamci_resume,
724         .driver         = {
725                 .name   = DRIVER_NAME,
726                 .owner  = THIS_MODULE,
727         },
728 };
729
730 static int __init pxamci_init(void)
731 {
732         return platform_driver_register(&pxamci_driver);
733 }
734
735 static void __exit pxamci_exit(void)
736 {
737         platform_driver_unregister(&pxamci_driver);
738 }
739
740 module_init(pxamci_init);
741 module_exit(pxamci_exit);
742
743 MODULE_DESCRIPTION("PXA Multimedia Card Interface Driver");
744 MODULE_LICENSE("GPL");
745 MODULE_ALIAS("platform:pxa2xx-mci");