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Merge branch 'omap-clock-fixes' of git://git.pwsan.com/linux-2.6
[linux-2.6-omap-h63xx.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/hardware.h>
34 #include <mach/dma.h>
35 #include <mach/mmc.h>
36
37 #include "pxamci.h"
38
39 #define DRIVER_NAME     "pxa2xx-mci"
40
41 #define NR_SG   1
42 #define CLKRT_OFF       (~0)
43
44 struct pxamci_host {
45         struct mmc_host         *mmc;
46         spinlock_t              lock;
47         struct resource         *res;
48         void __iomem            *base;
49         struct clk              *clk;
50         unsigned long           clkrate;
51         int                     irq;
52         int                     dma;
53         unsigned int            clkrt;
54         unsigned int            cmdat;
55         unsigned int            imask;
56         unsigned int            power_mode;
57         struct pxamci_platform_data *pdata;
58
59         struct mmc_request      *mrq;
60         struct mmc_command      *cmd;
61         struct mmc_data         *data;
62
63         dma_addr_t              sg_dma;
64         struct pxa_dma_desc     *sg_cpu;
65         unsigned int            dma_len;
66
67         unsigned int            dma_dir;
68         unsigned int            dma_drcmrrx;
69         unsigned int            dma_drcmrtx;
70 };
71
72 static void pxamci_stop_clock(struct pxamci_host *host)
73 {
74         if (readl(host->base + MMC_STAT) & STAT_CLK_EN) {
75                 unsigned long timeout = 10000;
76                 unsigned int v;
77
78                 writel(STOP_CLOCK, host->base + MMC_STRPCL);
79
80                 do {
81                         v = readl(host->base + MMC_STAT);
82                         if (!(v & STAT_CLK_EN))
83                                 break;
84                         udelay(1);
85                 } while (timeout--);
86
87                 if (v & STAT_CLK_EN)
88                         dev_err(mmc_dev(host->mmc), "unable to stop clock\n");
89         }
90 }
91
92 static void pxamci_enable_irq(struct pxamci_host *host, unsigned int mask)
93 {
94         unsigned long flags;
95
96         spin_lock_irqsave(&host->lock, flags);
97         host->imask &= ~mask;
98         writel(host->imask, host->base + MMC_I_MASK);
99         spin_unlock_irqrestore(&host->lock, flags);
100 }
101
102 static void pxamci_disable_irq(struct pxamci_host *host, unsigned int mask)
103 {
104         unsigned long flags;
105
106         spin_lock_irqsave(&host->lock, flags);
107         host->imask |= mask;
108         writel(host->imask, host->base + MMC_I_MASK);
109         spin_unlock_irqrestore(&host->lock, flags);
110 }
111
112 static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data)
113 {
114         unsigned int nob = data->blocks;
115         unsigned long long clks;
116         unsigned int timeout;
117         bool dalgn = 0;
118         u32 dcmd;
119         int i;
120
121         host->data = data;
122
123         if (data->flags & MMC_DATA_STREAM)
124                 nob = 0xffff;
125
126         writel(nob, host->base + MMC_NOB);
127         writel(data->blksz, host->base + MMC_BLKLEN);
128
129         clks = (unsigned long long)data->timeout_ns * host->clkrate;
130         do_div(clks, 1000000000UL);
131         timeout = (unsigned int)clks + (data->timeout_clks << host->clkrt);
132         writel((timeout + 255) / 256, host->base + MMC_RDTO);
133
134         if (data->flags & MMC_DATA_READ) {
135                 host->dma_dir = DMA_FROM_DEVICE;
136                 dcmd = DCMD_INCTRGADDR | DCMD_FLOWTRG;
137                 DRCMR(host->dma_drcmrtx) = 0;
138                 DRCMR(host->dma_drcmrrx) = host->dma | DRCMR_MAPVLD;
139         } else {
140                 host->dma_dir = DMA_TO_DEVICE;
141                 dcmd = DCMD_INCSRCADDR | DCMD_FLOWSRC;
142                 DRCMR(host->dma_drcmrrx) = 0;
143                 DRCMR(host->dma_drcmrtx) = host->dma | DRCMR_MAPVLD;
144         }
145
146         dcmd |= DCMD_BURST32 | DCMD_WIDTH1;
147
148         host->dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
149                                    host->dma_dir);
150
151         for (i = 0; i < host->dma_len; i++) {
152                 unsigned int length = sg_dma_len(&data->sg[i]);
153                 host->sg_cpu[i].dcmd = dcmd | length;
154                 if (length & 31 && !(data->flags & MMC_DATA_READ))
155                         host->sg_cpu[i].dcmd |= DCMD_ENDIRQEN;
156                 /* Not aligned to 8-byte boundary? */
157                 if (sg_dma_address(&data->sg[i]) & 0x7)
158                         dalgn = 1;
159                 if (data->flags & MMC_DATA_READ) {
160                         host->sg_cpu[i].dsadr = host->res->start + MMC_RXFIFO;
161                         host->sg_cpu[i].dtadr = sg_dma_address(&data->sg[i]);
162                 } else {
163                         host->sg_cpu[i].dsadr = sg_dma_address(&data->sg[i]);
164                         host->sg_cpu[i].dtadr = host->res->start + MMC_TXFIFO;
165                 }
166                 host->sg_cpu[i].ddadr = host->sg_dma + (i + 1) *
167                                         sizeof(struct pxa_dma_desc);
168         }
169         host->sg_cpu[host->dma_len - 1].ddadr = DDADR_STOP;
170         wmb();
171
172         /*
173          * The PXA27x DMA controller encounters overhead when working with
174          * unaligned (to 8-byte boundaries) data, so switch on byte alignment
175          * mode only if we have unaligned data.
176          */
177         if (dalgn)
178                 DALGN |= (1 << host->dma);
179         else
180                 DALGN &= ~(1 << host->dma);
181         DDADR(host->dma) = host->sg_dma;
182
183         /*
184          * workaround for erratum #91:
185          * only start DMA now if we are doing a read,
186          * otherwise we wait until CMD/RESP has finished
187          * before starting DMA.
188          */
189         if (!cpu_is_pxa27x() || data->flags & MMC_DATA_READ)
190                 DCSR(host->dma) = DCSR_RUN;
191 }
192
193 static void pxamci_start_cmd(struct pxamci_host *host, struct mmc_command *cmd, unsigned int cmdat)
194 {
195         WARN_ON(host->cmd != NULL);
196         host->cmd = cmd;
197
198         if (cmd->flags & MMC_RSP_BUSY)
199                 cmdat |= CMDAT_BUSY;
200
201 #define RSP_TYPE(x)     ((x) & ~(MMC_RSP_BUSY|MMC_RSP_OPCODE))
202         switch (RSP_TYPE(mmc_resp_type(cmd))) {
203         case RSP_TYPE(MMC_RSP_R1): /* r1, r1b, r6, r7 */
204                 cmdat |= CMDAT_RESP_SHORT;
205                 break;
206         case RSP_TYPE(MMC_RSP_R3):
207                 cmdat |= CMDAT_RESP_R3;
208                 break;
209         case RSP_TYPE(MMC_RSP_R2):
210                 cmdat |= CMDAT_RESP_R2;
211                 break;
212         default:
213                 break;
214         }
215
216         writel(cmd->opcode, host->base + MMC_CMD);
217         writel(cmd->arg >> 16, host->base + MMC_ARGH);
218         writel(cmd->arg & 0xffff, host->base + MMC_ARGL);
219         writel(cmdat, host->base + MMC_CMDAT);
220         writel(host->clkrt, host->base + MMC_CLKRT);
221
222         writel(START_CLOCK, host->base + MMC_STRPCL);
223
224         pxamci_enable_irq(host, END_CMD_RES);
225 }
226
227 static void pxamci_finish_request(struct pxamci_host *host, struct mmc_request *mrq)
228 {
229         host->mrq = NULL;
230         host->cmd = NULL;
231         host->data = NULL;
232         mmc_request_done(host->mmc, mrq);
233 }
234
235 static int pxamci_cmd_done(struct pxamci_host *host, unsigned int stat)
236 {
237         struct mmc_command *cmd = host->cmd;
238         int i;
239         u32 v;
240
241         if (!cmd)
242                 return 0;
243
244         host->cmd = NULL;
245
246         /*
247          * Did I mention this is Sick.  We always need to
248          * discard the upper 8 bits of the first 16-bit word.
249          */
250         v = readl(host->base + MMC_RES) & 0xffff;
251         for (i = 0; i < 4; i++) {
252                 u32 w1 = readl(host->base + MMC_RES) & 0xffff;
253                 u32 w2 = readl(host->base + MMC_RES) & 0xffff;
254                 cmd->resp[i] = v << 24 | w1 << 8 | w2 >> 8;
255                 v = w2;
256         }
257
258         if (stat & STAT_TIME_OUT_RESPONSE) {
259                 cmd->error = -ETIMEDOUT;
260         } else if (stat & STAT_RES_CRC_ERR && cmd->flags & MMC_RSP_CRC) {
261                 /*
262                  * workaround for erratum #42:
263                  * Intel PXA27x Family Processor Specification Update Rev 001
264                  * A bogus CRC error can appear if the msb of a 136 bit
265                  * response is a one.
266                  */
267                 if (cpu_is_pxa27x() &&
268                     (cmd->flags & MMC_RSP_136 && cmd->resp[0] & 0x80000000))
269                         pr_debug("ignoring CRC from command %d - *risky*\n", cmd->opcode);
270                 else
271                         cmd->error = -EILSEQ;
272         }
273
274         pxamci_disable_irq(host, END_CMD_RES);
275         if (host->data && !cmd->error) {
276                 pxamci_enable_irq(host, DATA_TRAN_DONE);
277                 /*
278                  * workaround for erratum #91, if doing write
279                  * enable DMA late
280                  */
281                 if (cpu_is_pxa27x() && host->data->flags & MMC_DATA_WRITE)
282                         DCSR(host->dma) = DCSR_RUN;
283         } else {
284                 pxamci_finish_request(host, host->mrq);
285         }
286
287         return 1;
288 }
289
290 static int pxamci_data_done(struct pxamci_host *host, unsigned int stat)
291 {
292         struct mmc_data *data = host->data;
293
294         if (!data)
295                 return 0;
296
297         DCSR(host->dma) = 0;
298         dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
299                      host->dma_dir);
300
301         if (stat & STAT_READ_TIME_OUT)
302                 data->error = -ETIMEDOUT;
303         else if (stat & (STAT_CRC_READ_ERROR|STAT_CRC_WRITE_ERROR))
304                 data->error = -EILSEQ;
305
306         /*
307          * There appears to be a hardware design bug here.  There seems to
308          * be no way to find out how much data was transferred to the card.
309          * This means that if there was an error on any block, we mark all
310          * data blocks as being in error.
311          */
312         if (!data->error)
313                 data->bytes_xfered = data->blocks * data->blksz;
314         else
315                 data->bytes_xfered = 0;
316
317         pxamci_disable_irq(host, DATA_TRAN_DONE);
318
319         host->data = NULL;
320         if (host->mrq->stop) {
321                 pxamci_stop_clock(host);
322                 pxamci_start_cmd(host, host->mrq->stop, host->cmdat);
323         } else {
324                 pxamci_finish_request(host, host->mrq);
325         }
326
327         return 1;
328 }
329
330 static irqreturn_t pxamci_irq(int irq, void *devid)
331 {
332         struct pxamci_host *host = devid;
333         unsigned int ireg;
334         int handled = 0;
335
336         ireg = readl(host->base + MMC_I_REG) & ~readl(host->base + MMC_I_MASK);
337
338         if (ireg) {
339                 unsigned stat = readl(host->base + MMC_STAT);
340
341                 pr_debug("PXAMCI: irq %08x stat %08x\n", ireg, stat);
342
343                 if (ireg & END_CMD_RES)
344                         handled |= pxamci_cmd_done(host, stat);
345                 if (ireg & DATA_TRAN_DONE)
346                         handled |= pxamci_data_done(host, stat);
347                 if (ireg & SDIO_INT) {
348                         mmc_signal_sdio_irq(host->mmc);
349                         handled = 1;
350                 }
351         }
352
353         return IRQ_RETVAL(handled);
354 }
355
356 static void pxamci_request(struct mmc_host *mmc, struct mmc_request *mrq)
357 {
358         struct pxamci_host *host = mmc_priv(mmc);
359         unsigned int cmdat;
360
361         WARN_ON(host->mrq != NULL);
362
363         host->mrq = mrq;
364
365         pxamci_stop_clock(host);
366
367         cmdat = host->cmdat;
368         host->cmdat &= ~CMDAT_INIT;
369
370         if (mrq->data) {
371                 pxamci_setup_data(host, mrq->data);
372
373                 cmdat &= ~CMDAT_BUSY;
374                 cmdat |= CMDAT_DATAEN | CMDAT_DMAEN;
375                 if (mrq->data->flags & MMC_DATA_WRITE)
376                         cmdat |= CMDAT_WRITE;
377
378                 if (mrq->data->flags & MMC_DATA_STREAM)
379                         cmdat |= CMDAT_STREAM;
380         }
381
382         pxamci_start_cmd(host, mrq->cmd, cmdat);
383 }
384
385 static int pxamci_get_ro(struct mmc_host *mmc)
386 {
387         struct pxamci_host *host = mmc_priv(mmc);
388
389         if (host->pdata && host->pdata->get_ro)
390                 return !!host->pdata->get_ro(mmc_dev(mmc));
391         /*
392          * Board doesn't support read only detection; let the mmc core
393          * decide what to do.
394          */
395         return -ENOSYS;
396 }
397
398 static void pxamci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
399 {
400         struct pxamci_host *host = mmc_priv(mmc);
401
402         if (ios->clock) {
403                 unsigned long rate = host->clkrate;
404                 unsigned int clk = rate / ios->clock;
405
406                 if (host->clkrt == CLKRT_OFF)
407                         clk_enable(host->clk);
408
409                 if (ios->clock == 26000000) {
410                         /* to support 26MHz on pxa300/pxa310 */
411                         host->clkrt = 7;
412                 } else {
413                         /* to handle (19.5MHz, 26MHz) */
414                         if (!clk)
415                                 clk = 1;
416
417                         /*
418                          * clk might result in a lower divisor than we
419                          * desire.  check for that condition and adjust
420                          * as appropriate.
421                          */
422                         if (rate / clk > ios->clock)
423                                 clk <<= 1;
424                         host->clkrt = fls(clk) - 1;
425                 }
426
427                 /*
428                  * we write clkrt on the next command
429                  */
430         } else {
431                 pxamci_stop_clock(host);
432                 if (host->clkrt != CLKRT_OFF) {
433                         host->clkrt = CLKRT_OFF;
434                         clk_disable(host->clk);
435                 }
436         }
437
438         if (host->power_mode != ios->power_mode) {
439                 host->power_mode = ios->power_mode;
440
441                 if (host->pdata && host->pdata->setpower)
442                         host->pdata->setpower(mmc_dev(mmc), ios->vdd);
443
444                 if (ios->power_mode == MMC_POWER_ON)
445                         host->cmdat |= CMDAT_INIT;
446         }
447
448         if (ios->bus_width == MMC_BUS_WIDTH_4)
449                 host->cmdat |= CMDAT_SD_4DAT;
450         else
451                 host->cmdat &= ~CMDAT_SD_4DAT;
452
453         pr_debug("PXAMCI: clkrt = %x cmdat = %x\n",
454                  host->clkrt, host->cmdat);
455 }
456
457 static void pxamci_enable_sdio_irq(struct mmc_host *host, int enable)
458 {
459         struct pxamci_host *pxa_host = mmc_priv(host);
460
461         if (enable)
462                 pxamci_enable_irq(pxa_host, SDIO_INT);
463         else
464                 pxamci_disable_irq(pxa_host, SDIO_INT);
465 }
466
467 static const struct mmc_host_ops pxamci_ops = {
468         .request                = pxamci_request,
469         .get_ro                 = pxamci_get_ro,
470         .set_ios                = pxamci_set_ios,
471         .enable_sdio_irq        = pxamci_enable_sdio_irq,
472 };
473
474 static void pxamci_dma_irq(int dma, void *devid)
475 {
476         struct pxamci_host *host = devid;
477         int dcsr = DCSR(dma);
478         DCSR(dma) = dcsr & ~DCSR_STOPIRQEN;
479
480         if (dcsr & DCSR_ENDINTR) {
481                 writel(BUF_PART_FULL, host->base + MMC_PRTBUF);
482         } else {
483                 printk(KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
484                        mmc_hostname(host->mmc), dma, dcsr);
485                 host->data->error = -EIO;
486                 pxamci_data_done(host, 0);
487         }
488 }
489
490 static irqreturn_t pxamci_detect_irq(int irq, void *devid)
491 {
492         struct pxamci_host *host = mmc_priv(devid);
493
494         mmc_detect_change(devid, host->pdata->detect_delay);
495         return IRQ_HANDLED;
496 }
497
498 static int pxamci_probe(struct platform_device *pdev)
499 {
500         struct mmc_host *mmc;
501         struct pxamci_host *host = NULL;
502         struct resource *r, *dmarx, *dmatx;
503         int ret, irq;
504
505         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
506         irq = platform_get_irq(pdev, 0);
507         if (!r || irq < 0)
508                 return -ENXIO;
509
510         r = request_mem_region(r->start, SZ_4K, DRIVER_NAME);
511         if (!r)
512                 return -EBUSY;
513
514         mmc = mmc_alloc_host(sizeof(struct pxamci_host), &pdev->dev);
515         if (!mmc) {
516                 ret = -ENOMEM;
517                 goto out;
518         }
519
520         mmc->ops = &pxamci_ops;
521
522         /*
523          * We can do SG-DMA, but we don't because we never know how much
524          * data we successfully wrote to the card.
525          */
526         mmc->max_phys_segs = NR_SG;
527
528         /*
529          * Our hardware DMA can handle a maximum of one page per SG entry.
530          */
531         mmc->max_seg_size = PAGE_SIZE;
532
533         /*
534          * Block length register is only 10 bits before PXA27x.
535          */
536         mmc->max_blk_size = cpu_is_pxa25x() ? 1023 : 2048;
537
538         /*
539          * Block count register is 16 bits.
540          */
541         mmc->max_blk_count = 65535;
542
543         host = mmc_priv(mmc);
544         host->mmc = mmc;
545         host->dma = -1;
546         host->pdata = pdev->dev.platform_data;
547         host->clkrt = CLKRT_OFF;
548
549         host->clk = clk_get(&pdev->dev, NULL);
550         if (IS_ERR(host->clk)) {
551                 ret = PTR_ERR(host->clk);
552                 host->clk = NULL;
553                 goto out;
554         }
555
556         host->clkrate = clk_get_rate(host->clk);
557
558         /*
559          * Calculate minimum clock rate, rounding up.
560          */
561         mmc->f_min = (host->clkrate + 63) / 64;
562         mmc->f_max = (cpu_is_pxa300() || cpu_is_pxa310()) ? 26000000
563                                                           : host->clkrate;
564
565         mmc->ocr_avail = host->pdata ?
566                          host->pdata->ocr_mask :
567                          MMC_VDD_32_33|MMC_VDD_33_34;
568         mmc->caps = 0;
569         host->cmdat = 0;
570         if (!cpu_is_pxa25x()) {
571                 mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
572                 host->cmdat |= CMDAT_SDIO_INT_EN;
573                 if (cpu_is_pxa300() || cpu_is_pxa310())
574                         mmc->caps |= MMC_CAP_MMC_HIGHSPEED |
575                                      MMC_CAP_SD_HIGHSPEED;
576         }
577
578         host->sg_cpu = dma_alloc_coherent(&pdev->dev, PAGE_SIZE, &host->sg_dma, GFP_KERNEL);
579         if (!host->sg_cpu) {
580                 ret = -ENOMEM;
581                 goto out;
582         }
583
584         spin_lock_init(&host->lock);
585         host->res = r;
586         host->irq = irq;
587         host->imask = MMC_I_MASK_ALL;
588
589         host->base = ioremap(r->start, SZ_4K);
590         if (!host->base) {
591                 ret = -ENOMEM;
592                 goto out;
593         }
594
595         /*
596          * Ensure that the host controller is shut down, and setup
597          * with our defaults.
598          */
599         pxamci_stop_clock(host);
600         writel(0, host->base + MMC_SPI);
601         writel(64, host->base + MMC_RESTO);
602         writel(host->imask, host->base + MMC_I_MASK);
603
604         host->dma = pxa_request_dma(DRIVER_NAME, DMA_PRIO_LOW,
605                                     pxamci_dma_irq, host);
606         if (host->dma < 0) {
607                 ret = -EBUSY;
608                 goto out;
609         }
610
611         ret = request_irq(host->irq, pxamci_irq, 0, DRIVER_NAME, host);
612         if (ret)
613                 goto out;
614
615         platform_set_drvdata(pdev, mmc);
616
617         dmarx = platform_get_resource(pdev, IORESOURCE_DMA, 0);
618         if (!dmarx) {
619                 ret = -ENXIO;
620                 goto out;
621         }
622         host->dma_drcmrrx = dmarx->start;
623
624         dmatx = platform_get_resource(pdev, IORESOURCE_DMA, 1);
625         if (!dmatx) {
626                 ret = -ENXIO;
627                 goto out;
628         }
629         host->dma_drcmrtx = dmatx->start;
630
631         if (host->pdata && host->pdata->init)
632                 host->pdata->init(&pdev->dev, pxamci_detect_irq, mmc);
633
634         mmc_add_host(mmc);
635
636         return 0;
637
638  out:
639         if (host) {
640                 if (host->dma >= 0)
641                         pxa_free_dma(host->dma);
642                 if (host->base)
643                         iounmap(host->base);
644                 if (host->sg_cpu)
645                         dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
646                 if (host->clk)
647                         clk_put(host->clk);
648         }
649         if (mmc)
650                 mmc_free_host(mmc);
651         release_resource(r);
652         return ret;
653 }
654
655 static int pxamci_remove(struct platform_device *pdev)
656 {
657         struct mmc_host *mmc = platform_get_drvdata(pdev);
658
659         platform_set_drvdata(pdev, NULL);
660
661         if (mmc) {
662                 struct pxamci_host *host = mmc_priv(mmc);
663
664                 if (host->pdata && host->pdata->exit)
665                         host->pdata->exit(&pdev->dev, mmc);
666
667                 mmc_remove_host(mmc);
668
669                 pxamci_stop_clock(host);
670                 writel(TXFIFO_WR_REQ|RXFIFO_RD_REQ|CLK_IS_OFF|STOP_CMD|
671                        END_CMD_RES|PRG_DONE|DATA_TRAN_DONE,
672                        host->base + MMC_I_MASK);
673
674                 DRCMR(host->dma_drcmrrx) = 0;
675                 DRCMR(host->dma_drcmrtx) = 0;
676
677                 free_irq(host->irq, host);
678                 pxa_free_dma(host->dma);
679                 iounmap(host->base);
680                 dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
681
682                 clk_put(host->clk);
683
684                 release_resource(host->res);
685
686                 mmc_free_host(mmc);
687         }
688         return 0;
689 }
690
691 #ifdef CONFIG_PM
692 static int pxamci_suspend(struct platform_device *dev, pm_message_t state)
693 {
694         struct mmc_host *mmc = platform_get_drvdata(dev);
695         int ret = 0;
696
697         if (mmc)
698                 ret = mmc_suspend_host(mmc, state);
699
700         return ret;
701 }
702
703 static int pxamci_resume(struct platform_device *dev)
704 {
705         struct mmc_host *mmc = platform_get_drvdata(dev);
706         int ret = 0;
707
708         if (mmc)
709                 ret = mmc_resume_host(mmc);
710
711         return ret;
712 }
713 #else
714 #define pxamci_suspend  NULL
715 #define pxamci_resume   NULL
716 #endif
717
718 static struct platform_driver pxamci_driver = {
719         .probe          = pxamci_probe,
720         .remove         = pxamci_remove,
721         .suspend        = pxamci_suspend,
722         .resume         = pxamci_resume,
723         .driver         = {
724                 .name   = DRIVER_NAME,
725                 .owner  = THIS_MODULE,
726         },
727 };
728
729 static int __init pxamci_init(void)
730 {
731         return platform_driver_register(&pxamci_driver);
732 }
733
734 static void __exit pxamci_exit(void)
735 {
736         platform_driver_unregister(&pxamci_driver);
737 }
738
739 module_init(pxamci_init);
740 module_exit(pxamci_exit);
741
742 MODULE_DESCRIPTION("PXA Multimedia Card Interface Driver");
743 MODULE_LICENSE("GPL");
744 MODULE_ALIAS("platform:pxa2xx-mci");