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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / mmc / host / pxamci.c
blobcb2dc0e75ba7fc1ff8d6610176326fa4eb675a5d
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 #include <linux/regulator/consumer.h>
31 #include <linux/gpio.h>
32 #include <linux/gfp.h>
33
34 #include <asm/sizes.h>
35
36 #include <mach/hardware.h>
37 #include <mach/dma.h>
38 #include <mach/mmc.h>
39
40 #include "pxamci.h"
41
42 #define DRIVER_NAME "pxa2xx-mci"
43
44 #define NR_SG 1
45 #define CLKRT_OFF (~0)
46
47 #define mmc_has_26MHz() (cpu_is_pxa300() || cpu_is_pxa310() \
48 || cpu_is_pxa935())
49
50 struct pxamci_host {
51 struct mmc_host *mmc;
52 spinlock_t lock;
53 struct resource *res;
54 void __iomem *base;
55 struct clk *clk;
56 unsigned long clkrate;
57 int irq;
58 int dma;
59 unsigned int clkrt;
60 unsigned int cmdat;
61 unsigned int imask;
62 unsigned int power_mode;
63 struct pxamci_platform_data *pdata;
64
65 struct mmc_request *mrq;
66 struct mmc_command *cmd;
67 struct mmc_data *data;
68
69 dma_addr_t sg_dma;
70 struct pxa_dma_desc *sg_cpu;
71 unsigned int dma_len;
72
73 unsigned int dma_dir;
74 unsigned int dma_drcmrrx;
75 unsigned int dma_drcmrtx;
76
77 struct regulator *vcc;
78 };
79
80 static inline void pxamci_init_ocr(struct pxamci_host *host)
81 {
82 #ifdef CONFIG_REGULATOR
83 host->vcc = regulator_get(mmc_dev(host->mmc), "vmmc");
84
85 if (IS_ERR(host->vcc))
86 host->vcc = NULL;
87 else {
88 host->mmc->ocr_avail = mmc_regulator_get_ocrmask(host->vcc);
89 if (host->pdata && host->pdata->ocr_mask)
90 dev_warn(mmc_dev(host->mmc),
91 "ocr_mask/setpower will not be used\n");
92 }
93 #endif
94 if (host->vcc == NULL) {
95 /* fall-back to platform data */
96 host->mmc->ocr_avail = host->pdata ?
97 host->pdata->ocr_mask :
98 MMC_VDD_32_33 | MMC_VDD_33_34;
99 }
100 }
101
102 static inline int pxamci_set_power(struct pxamci_host *host,
103 unsigned char power_mode,
104 unsigned int vdd)
105 {
106 int on;
107
108 if (host->vcc) {
109 int ret;
110
111 if (power_mode == MMC_POWER_UP) {
112 ret = mmc_regulator_set_ocr(host->mmc, host->vcc, vdd);
113 if (ret)
114 return ret;
115 } else if (power_mode == MMC_POWER_OFF) {
116 ret = mmc_regulator_set_ocr(host->mmc, host->vcc, 0);
117 if (ret)
118 return ret;
119 }
120 }
121 if (!host->vcc && host->pdata &&
122 gpio_is_valid(host->pdata->gpio_power)) {
123 on = ((1 << vdd) & host->pdata->ocr_mask);
124 gpio_set_value(host->pdata->gpio_power,
125 !!on ^ host->pdata->gpio_power_invert);
126 }
127 if (!host->vcc && host->pdata && host->pdata->setpower)
128 host->pdata->setpower(mmc_dev(host->mmc), vdd);
129
130 return 0;
131 }
132
133 static void pxamci_stop_clock(struct pxamci_host *host)
134 {
135 if (readl(host->base + MMC_STAT) & STAT_CLK_EN) {
136 unsigned long timeout = 10000;
137 unsigned int v;
138
139 writel(STOP_CLOCK, host->base + MMC_STRPCL);
140
141 do {
142 v = readl(host->base + MMC_STAT);
143 if (!(v & STAT_CLK_EN))
144 break;
145 udelay(1);
146 } while (timeout--);
147
148 if (v & STAT_CLK_EN)
149 dev_err(mmc_dev(host->mmc), "unable to stop clock\n");
150 }
151 }
152
153 static void pxamci_enable_irq(struct pxamci_host *host, unsigned int mask)
154 {
155 unsigned long flags;
156
157 spin_lock_irqsave(&host->lock, flags);
158 host->imask &= ~mask;
159 writel(host->imask, host->base + MMC_I_MASK);
160 spin_unlock_irqrestore(&host->lock, flags);
161 }
162
163 static void pxamci_disable_irq(struct pxamci_host *host, unsigned int mask)
164 {
165 unsigned long flags;
166
167 spin_lock_irqsave(&host->lock, flags);
168 host->imask |= mask;
169 writel(host->imask, host->base + MMC_I_MASK);
170 spin_unlock_irqrestore(&host->lock, flags);
171 }
172
173 static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data)
174 {
175 unsigned int nob = data->blocks;
176 unsigned long long clks;
177 unsigned int timeout;
178 bool dalgn = 0;
179 u32 dcmd;
180 int i;
181
182 host->data = data;
183
184 if (data->flags & MMC_DATA_STREAM)
185 nob = 0xffff;
186
187 writel(nob, host->base + MMC_NOB);
188 writel(data->blksz, host->base + MMC_BLKLEN);
189
190 clks = (unsigned long long)data->timeout_ns * host->clkrate;
191 do_div(clks, 1000000000UL);
192 timeout = (unsigned int)clks + (data->timeout_clks << host->clkrt);
193 writel((timeout + 255) / 256, host->base + MMC_RDTO);
194
195 if (data->flags & MMC_DATA_READ) {
196 host->dma_dir = DMA_FROM_DEVICE;
197 dcmd = DCMD_INCTRGADDR | DCMD_FLOWSRC;
198 DRCMR(host->dma_drcmrtx) = 0;
199 DRCMR(host->dma_drcmrrx) = host->dma | DRCMR_MAPVLD;
200 } else {
201 host->dma_dir = DMA_TO_DEVICE;
202 dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG;
203 DRCMR(host->dma_drcmrrx) = 0;
204 DRCMR(host->dma_drcmrtx) = host->dma | DRCMR_MAPVLD;
205 }
206
207 dcmd |= DCMD_BURST32 | DCMD_WIDTH1;
208
209 host->dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
210 host->dma_dir);
211
212 for (i = 0; i < host->dma_len; i++) {
213 unsigned int length = sg_dma_len(&data->sg[i]);
214 host->sg_cpu[i].dcmd = dcmd | length;
215 if (length & 31 && !(data->flags & MMC_DATA_READ))
216 host->sg_cpu[i].dcmd |= DCMD_ENDIRQEN;
217 /* Not aligned to 8-byte boundary? */
218 if (sg_dma_address(&data->sg[i]) & 0x7)
219 dalgn = 1;
220 if (data->flags & MMC_DATA_READ) {
221 host->sg_cpu[i].dsadr = host->res->start + MMC_RXFIFO;
222 host->sg_cpu[i].dtadr = sg_dma_address(&data->sg[i]);
223 } else {
224 host->sg_cpu[i].dsadr = sg_dma_address(&data->sg[i]);
225 host->sg_cpu[i].dtadr = host->res->start + MMC_TXFIFO;
226 }
227 host->sg_cpu[i].ddadr = host->sg_dma + (i + 1) *
228 sizeof(struct pxa_dma_desc);
229 }
230 host->sg_cpu[host->dma_len - 1].ddadr = DDADR_STOP;
231 wmb();
232
233 /*
234 * The PXA27x DMA controller encounters overhead when working with
235 * unaligned (to 8-byte boundaries) data, so switch on byte alignment
236 * mode only if we have unaligned data.
237 */
238 if (dalgn)
239 DALGN |= (1 << host->dma);
240 else
241 DALGN &= ~(1 << host->dma);
242 DDADR(host->dma) = host->sg_dma;
243
244 /*
245 * workaround for erratum #91:
246 * only start DMA now if we are doing a read,
247 * otherwise we wait until CMD/RESP has finished
248 * before starting DMA.
249 */
250 if (!cpu_is_pxa27x() || data->flags & MMC_DATA_READ)
251 DCSR(host->dma) = DCSR_RUN;
252 }
253
254 static void pxamci_start_cmd(struct pxamci_host *host, struct mmc_command *cmd, unsigned int cmdat)
255 {
256 WARN_ON(host->cmd != NULL);
257 host->cmd = cmd;
258
259 if (cmd->flags & MMC_RSP_BUSY)
260 cmdat |= CMDAT_BUSY;
261
262 #define RSP_TYPE(x) ((x) & ~(MMC_RSP_BUSY|MMC_RSP_OPCODE))
263 switch (RSP_TYPE(mmc_resp_type(cmd))) {
264 case RSP_TYPE(MMC_RSP_R1): /* r1, r1b, r6, r7 */
265 cmdat |= CMDAT_RESP_SHORT;
266 break;
267 case RSP_TYPE(MMC_RSP_R3):
268 cmdat |= CMDAT_RESP_R3;
269 break;
270 case RSP_TYPE(MMC_RSP_R2):
271 cmdat |= CMDAT_RESP_R2;
272 break;
273 default:
274 break;
275 }
276
277 writel(cmd->opcode, host->base + MMC_CMD);
278 writel(cmd->arg >> 16, host->base + MMC_ARGH);
279 writel(cmd->arg & 0xffff, host->base + MMC_ARGL);
280 writel(cmdat, host->base + MMC_CMDAT);
281 writel(host->clkrt, host->base + MMC_CLKRT);
282
283 writel(START_CLOCK, host->base + MMC_STRPCL);
284
285 pxamci_enable_irq(host, END_CMD_RES);
286 }
287
288 static void pxamci_finish_request(struct pxamci_host *host, struct mmc_request *mrq)
289 {
290 host->mrq = NULL;
291 host->cmd = NULL;
292 host->data = NULL;
293 mmc_request_done(host->mmc, mrq);
294 }
295
296 static int pxamci_cmd_done(struct pxamci_host *host, unsigned int stat)
297 {
298 struct mmc_command *cmd = host->cmd;
299 int i;
300 u32 v;
301
302 if (!cmd)
303 return 0;
304
305 host->cmd = NULL;
306
307 /*
308 * Did I mention this is Sick. We always need to
309 * discard the upper 8 bits of the first 16-bit word.
310 */
311 v = readl(host->base + MMC_RES) & 0xffff;
312 for (i = 0; i < 4; i++) {
313 u32 w1 = readl(host->base + MMC_RES) & 0xffff;
314 u32 w2 = readl(host->base + MMC_RES) & 0xffff;
315 cmd->resp[i] = v << 24 | w1 << 8 | w2 >> 8;
316 v = w2;
317 }
318
319 if (stat & STAT_TIME_OUT_RESPONSE) {
320 cmd->error = -ETIMEDOUT;
321 } else if (stat & STAT_RES_CRC_ERR && cmd->flags & MMC_RSP_CRC) {
322 /*
323 * workaround for erratum #42:
324 * Intel PXA27x Family Processor Specification Update Rev 001
325 * A bogus CRC error can appear if the msb of a 136 bit
326 * response is a one.
327 */
328 if (cpu_is_pxa27x() &&
329 (cmd->flags & MMC_RSP_136 && cmd->resp[0] & 0x80000000))
330 pr_debug("ignoring CRC from command %d - *risky*\n", cmd->opcode);
331 else
332 cmd->error = -EILSEQ;
333 }
334
335 pxamci_disable_irq(host, END_CMD_RES);
336 if (host->data && !cmd->error) {
337 pxamci_enable_irq(host, DATA_TRAN_DONE);
338 /*
339 * workaround for erratum #91, if doing write
340 * enable DMA late
341 */
342 if (cpu_is_pxa27x() && host->data->flags & MMC_DATA_WRITE)
343 DCSR(host->dma) = DCSR_RUN;
344 } else {
345 pxamci_finish_request(host, host->mrq);
346 }
347
348 return 1;
349 }
350
351 static int pxamci_data_done(struct pxamci_host *host, unsigned int stat)
352 {
353 struct mmc_data *data = host->data;
354
355 if (!data)
356 return 0;
357
358 DCSR(host->dma) = 0;
359 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
360 host->dma_dir);
361
362 if (stat & STAT_READ_TIME_OUT)
363 data->error = -ETIMEDOUT;
364 else if (stat & (STAT_CRC_READ_ERROR|STAT_CRC_WRITE_ERROR))
365 data->error = -EILSEQ;
366
367 /*
368 * There appears to be a hardware design bug here. There seems to
369 * be no way to find out how much data was transferred to the card.
370 * This means that if there was an error on any block, we mark all
371 * data blocks as being in error.
372 */
373 if (!data->error)
374 data->bytes_xfered = data->blocks * data->blksz;
375 else
376 data->bytes_xfered = 0;
377
378 pxamci_disable_irq(host, DATA_TRAN_DONE);
379
380 host->data = NULL;
381 if (host->mrq->stop) {
382 pxamci_stop_clock(host);
383 pxamci_start_cmd(host, host->mrq->stop, host->cmdat);
384 } else {
385 pxamci_finish_request(host, host->mrq);
386 }
387
388 return 1;
389 }
390
391 static irqreturn_t pxamci_irq(int irq, void *devid)
392 {
393 struct pxamci_host *host = devid;
394 unsigned int ireg;
395 int handled = 0;
396
397 ireg = readl(host->base + MMC_I_REG) & ~readl(host->base + MMC_I_MASK);
398
399 if (ireg) {
400 unsigned stat = readl(host->base + MMC_STAT);
401
402 pr_debug("PXAMCI: irq %08x stat %08x\n", ireg, stat);
403
404 if (ireg & END_CMD_RES)
405 handled |= pxamci_cmd_done(host, stat);
406 if (ireg & DATA_TRAN_DONE)
407 handled |= pxamci_data_done(host, stat);
408 if (ireg & SDIO_INT) {
409 mmc_signal_sdio_irq(host->mmc);
410 handled = 1;
411 }
412 }
413
414 return IRQ_RETVAL(handled);
415 }
416
417 static void pxamci_request(struct mmc_host *mmc, struct mmc_request *mrq)
418 {
419 struct pxamci_host *host = mmc_priv(mmc);
420 unsigned int cmdat;
421
422 WARN_ON(host->mrq != NULL);
423
424 host->mrq = mrq;
425
426 pxamci_stop_clock(host);
427
428 cmdat = host->cmdat;
429 host->cmdat &= ~CMDAT_INIT;
430
431 if (mrq->data) {
432 pxamci_setup_data(host, mrq->data);
433
434 cmdat &= ~CMDAT_BUSY;
435 cmdat |= CMDAT_DATAEN | CMDAT_DMAEN;
436 if (mrq->data->flags & MMC_DATA_WRITE)
437 cmdat |= CMDAT_WRITE;
438
439 if (mrq->data->flags & MMC_DATA_STREAM)
440 cmdat |= CMDAT_STREAM;
441 }
442
443 pxamci_start_cmd(host, mrq->cmd, cmdat);
444 }
445
446 static int pxamci_get_ro(struct mmc_host *mmc)
447 {
448 struct pxamci_host *host = mmc_priv(mmc);
449
450 if (host->pdata && gpio_is_valid(host->pdata->gpio_card_ro)) {
451 if (host->pdata->gpio_card_ro_invert)
452 return !gpio_get_value(host->pdata->gpio_card_ro);
453 else
454 return gpio_get_value(host->pdata->gpio_card_ro);
455 }
456 if (host->pdata && host->pdata->get_ro)
457 return !!host->pdata->get_ro(mmc_dev(mmc));
458 /*
459 * Board doesn't support read only detection; let the mmc core
460 * decide what to do.
461 */
462 return -ENOSYS;
463 }
464
465 static void pxamci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
466 {
467 struct pxamci_host *host = mmc_priv(mmc);
468
469 if (ios->clock) {
470 unsigned long rate = host->clkrate;
471 unsigned int clk = rate / ios->clock;
472
473 if (host->clkrt == CLKRT_OFF)
474 clk_enable(host->clk);
475
476 if (ios->clock == 26000000) {
477 /* to support 26MHz */
478 host->clkrt = 7;
479 } else {
480 /* to handle (19.5MHz, 26MHz) */
481 if (!clk)
482 clk = 1;
483
484 /*
485 * clk might result in a lower divisor than we
486 * desire. check for that condition and adjust
487 * as appropriate.
488 */
489 if (rate / clk > ios->clock)
490 clk <<= 1;
491 host->clkrt = fls(clk) - 1;
492 }
493
494 /*
495 * we write clkrt on the next command
496 */
497 } else {
498 pxamci_stop_clock(host);
499 if (host->clkrt != CLKRT_OFF) {
500 host->clkrt = CLKRT_OFF;
501 clk_disable(host->clk);
502 }
503 }
504
505 if (host->power_mode != ios->power_mode) {
506 int ret;
507
508 host->power_mode = ios->power_mode;
509
510 ret = pxamci_set_power(host, ios->power_mode, ios->vdd);
511 if (ret) {
512 dev_err(mmc_dev(mmc), "unable to set power\n");
513 /*
514 * The .set_ios() function in the mmc_host_ops
515 * struct return void, and failing to set the
516 * power should be rare so we print an error and
517 * return here.
518 */
519 return;
520 }
521
522 if (ios->power_mode == MMC_POWER_ON)
523 host->cmdat |= CMDAT_INIT;
524 }
525
526 if (ios->bus_width == MMC_BUS_WIDTH_4)
527 host->cmdat |= CMDAT_SD_4DAT;
528 else
529 host->cmdat &= ~CMDAT_SD_4DAT;
530
531 dev_dbg(mmc_dev(mmc), "PXAMCI: clkrt = %x cmdat = %x\n",
532 host->clkrt, host->cmdat);
533 }
534
535 static void pxamci_enable_sdio_irq(struct mmc_host *host, int enable)
536 {
537 struct pxamci_host *pxa_host = mmc_priv(host);
538
539 if (enable)
540 pxamci_enable_irq(pxa_host, SDIO_INT);
541 else
542 pxamci_disable_irq(pxa_host, SDIO_INT);
543 }
544
545 static const struct mmc_host_ops pxamci_ops = {
546 .request = pxamci_request,
547 .get_ro = pxamci_get_ro,
548 .set_ios = pxamci_set_ios,
549 .enable_sdio_irq = pxamci_enable_sdio_irq,
550 };
551
552 static void pxamci_dma_irq(int dma, void *devid)
553 {
554 struct pxamci_host *host = devid;
555 int dcsr = DCSR(dma);
556 DCSR(dma) = dcsr & ~DCSR_STOPIRQEN;
557
558 if (dcsr & DCSR_ENDINTR) {
559 writel(BUF_PART_FULL, host->base + MMC_PRTBUF);
560 } else {
561 pr_err("%s: DMA error on channel %d (DCSR=%#x)\n",
562 mmc_hostname(host->mmc), dma, dcsr);
563 host->data->error = -EIO;
564 pxamci_data_done(host, 0);
565 }
566 }
567
568 static irqreturn_t pxamci_detect_irq(int irq, void *devid)
569 {
570 struct pxamci_host *host = mmc_priv(devid);
571
572 mmc_detect_change(devid, msecs_to_jiffies(host->pdata->detect_delay_ms));
573 return IRQ_HANDLED;
574 }
575
576 static int pxamci_probe(struct platform_device *pdev)
577 {
578 struct mmc_host *mmc;
579 struct pxamci_host *host = NULL;
580 struct resource *r, *dmarx, *dmatx;
581 int ret, irq, gpio_cd = -1, gpio_ro = -1, gpio_power = -1;
582
583 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
584 irq = platform_get_irq(pdev, 0);
585 if (!r || irq < 0)
586 return -ENXIO;
587
588 r = request_mem_region(r->start, SZ_4K, DRIVER_NAME);
589 if (!r)
590 return -EBUSY;
591
592 mmc = mmc_alloc_host(sizeof(struct pxamci_host), &pdev->dev);
593 if (!mmc) {
594 ret = -ENOMEM;
595 goto out;
596 }
597
598 mmc->ops = &pxamci_ops;
599
600 /*
601 * We can do SG-DMA, but we don't because we never know how much
602 * data we successfully wrote to the card.
603 */
604 mmc->max_segs = NR_SG;
605
606 /*
607 * Our hardware DMA can handle a maximum of one page per SG entry.
608 */
609 mmc->max_seg_size = PAGE_SIZE;
610
611 /*
612 * Block length register is only 10 bits before PXA27x.
613 */
614 mmc->max_blk_size = cpu_is_pxa25x() ? 1023 : 2048;
615
616 /*
617 * Block count register is 16 bits.
618 */
619 mmc->max_blk_count = 65535;
620
621 host = mmc_priv(mmc);
622 host->mmc = mmc;
623 host->dma = -1;
624 host->pdata = pdev->dev.platform_data;
625 host->clkrt = CLKRT_OFF;
626
627 host->clk = clk_get(&pdev->dev, NULL);
628 if (IS_ERR(host->clk)) {
629 ret = PTR_ERR(host->clk);
630 host->clk = NULL;
631 goto out;
632 }
633
634 host->clkrate = clk_get_rate(host->clk);
635
636 /*
637 * Calculate minimum clock rate, rounding up.
638 */
639 mmc->f_min = (host->clkrate + 63) / 64;
640 mmc->f_max = (mmc_has_26MHz()) ? 26000000 : host->clkrate;
641
642 pxamci_init_ocr(host);
643
644 mmc->caps = 0;
645 host->cmdat = 0;
646 if (!cpu_is_pxa25x()) {
647 mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
648 host->cmdat |= CMDAT_SDIO_INT_EN;
649 if (mmc_has_26MHz())
650 mmc->caps |= MMC_CAP_MMC_HIGHSPEED |
651 MMC_CAP_SD_HIGHSPEED;
652 }
653
654 host->sg_cpu = dma_alloc_coherent(&pdev->dev, PAGE_SIZE, &host->sg_dma, GFP_KERNEL);
655 if (!host->sg_cpu) {
656 ret = -ENOMEM;
657 goto out;
658 }
659
660 spin_lock_init(&host->lock);
661 host->res = r;
662 host->irq = irq;
663 host->imask = MMC_I_MASK_ALL;
664
665 host->base = ioremap(r->start, SZ_4K);
666 if (!host->base) {
667 ret = -ENOMEM;
668 goto out;
669 }
670
671 /*
672 * Ensure that the host controller is shut down, and setup
673 * with our defaults.
674 */
675 pxamci_stop_clock(host);
676 writel(0, host->base + MMC_SPI);
677 writel(64, host->base + MMC_RESTO);
678 writel(host->imask, host->base + MMC_I_MASK);
679
680 host->dma = pxa_request_dma(DRIVER_NAME, DMA_PRIO_LOW,
681 pxamci_dma_irq, host);
682 if (host->dma < 0) {
683 ret = -EBUSY;
684 goto out;
685 }
686
687 ret = request_irq(host->irq, pxamci_irq, 0, DRIVER_NAME, host);
688 if (ret)
689 goto out;
690
691 platform_set_drvdata(pdev, mmc);
692
693 dmarx = platform_get_resource(pdev, IORESOURCE_DMA, 0);
694 if (!dmarx) {
695 ret = -ENXIO;
696 goto out;
697 }
698 host->dma_drcmrrx = dmarx->start;
699
700 dmatx = platform_get_resource(pdev, IORESOURCE_DMA, 1);
701 if (!dmatx) {
702 ret = -ENXIO;
703 goto out;
704 }
705 host->dma_drcmrtx = dmatx->start;
706
707 if (host->pdata) {
708 gpio_cd = host->pdata->gpio_card_detect;
709 gpio_ro = host->pdata->gpio_card_ro;
710 gpio_power = host->pdata->gpio_power;
711 }
712 if (gpio_is_valid(gpio_power)) {
713 ret = gpio_request(gpio_power, "mmc card power");
714 if (ret) {
715 dev_err(&pdev->dev, "Failed requesting gpio_power %d\n", gpio_power);
716 goto out;
717 }
718 gpio_direction_output(gpio_power,
719 host->pdata->gpio_power_invert);
720 }
721 if (gpio_is_valid(gpio_ro)) {
722 ret = gpio_request(gpio_ro, "mmc card read only");
723 if (ret) {
724 dev_err(&pdev->dev, "Failed requesting gpio_ro %d\n", gpio_ro);
725 goto err_gpio_ro;
726 }
727 gpio_direction_input(gpio_ro);
728 }
729 if (gpio_is_valid(gpio_cd)) {
730 ret = gpio_request(gpio_cd, "mmc card detect");
731 if (ret) {
732 dev_err(&pdev->dev, "Failed requesting gpio_cd %d\n", gpio_cd);
733 goto err_gpio_cd;
734 }
735 gpio_direction_input(gpio_cd);
736
737 ret = request_irq(gpio_to_irq(gpio_cd), pxamci_detect_irq,
738 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
739 "mmc card detect", mmc);
740 if (ret) {
741 dev_err(&pdev->dev, "failed to request card detect IRQ\n");
742 goto err_request_irq;
743 }
744 }
745
746 if (host->pdata && host->pdata->init)
747 host->pdata->init(&pdev->dev, pxamci_detect_irq, mmc);
748
749 if (gpio_is_valid(gpio_power) && host->pdata->setpower)
750 dev_warn(&pdev->dev, "gpio_power and setpower() both defined\n");
751 if (gpio_is_valid(gpio_ro) && host->pdata->get_ro)
752 dev_warn(&pdev->dev, "gpio_ro and get_ro() both defined\n");
753
754 mmc_add_host(mmc);
755
756 return 0;
757
758 err_request_irq:
759 gpio_free(gpio_cd);
760 err_gpio_cd:
761 gpio_free(gpio_ro);
762 err_gpio_ro:
763 gpio_free(gpio_power);
764 out:
765 if (host) {
766 if (host->dma >= 0)
767 pxa_free_dma(host->dma);
768 if (host->base)
769 iounmap(host->base);
770 if (host->sg_cpu)
771 dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
772 if (host->clk)
773 clk_put(host->clk);
774 }
775 if (mmc)
776 mmc_free_host(mmc);
777 release_resource(r);
778 return ret;
779 }
780
781 static int pxamci_remove(struct platform_device *pdev)
782 {
783 struct mmc_host *mmc = platform_get_drvdata(pdev);
784 int gpio_cd = -1, gpio_ro = -1, gpio_power = -1;
785
786 platform_set_drvdata(pdev, NULL);
787
788 if (mmc) {
789 struct pxamci_host *host = mmc_priv(mmc);
790
791 mmc_remove_host(mmc);
792
793 if (host->pdata) {
794 gpio_cd = host->pdata->gpio_card_detect;
795 gpio_ro = host->pdata->gpio_card_ro;
796 gpio_power = host->pdata->gpio_power;
797 }
798 if (gpio_is_valid(gpio_cd)) {
799 free_irq(gpio_to_irq(gpio_cd), mmc);
800 gpio_free(gpio_cd);
801 }
802 if (gpio_is_valid(gpio_ro))
803 gpio_free(gpio_ro);
804 if (gpio_is_valid(gpio_power))
805 gpio_free(gpio_power);
806 if (host->vcc)
807 regulator_put(host->vcc);
808
809 if (host->pdata && host->pdata->exit)
810 host->pdata->exit(&pdev->dev, mmc);
811
812 pxamci_stop_clock(host);
813 writel(TXFIFO_WR_REQ|RXFIFO_RD_REQ|CLK_IS_OFF|STOP_CMD|
814 END_CMD_RES|PRG_DONE|DATA_TRAN_DONE,
815 host->base + MMC_I_MASK);
816
817 DRCMR(host->dma_drcmrrx) = 0;
818 DRCMR(host->dma_drcmrtx) = 0;
819
820 free_irq(host->irq, host);
821 pxa_free_dma(host->dma);
822 iounmap(host->base);
823 dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
824
825 clk_put(host->clk);
826
827 release_resource(host->res);
828
829 mmc_free_host(mmc);
830 }
831 return 0;
832 }
833
834 #ifdef CONFIG_PM
835 static int pxamci_suspend(struct device *dev)
836 {
837 struct mmc_host *mmc = dev_get_drvdata(dev);
838 int ret = 0;
839
840 if (mmc)
841 ret = mmc_suspend_host(mmc);
842
843 return ret;
844 }
845
846 static int pxamci_resume(struct device *dev)
847 {
848 struct mmc_host *mmc = dev_get_drvdata(dev);
849 int ret = 0;
850
851 if (mmc)
852 ret = mmc_resume_host(mmc);
853
854 return ret;
855 }
856
857 static const struct dev_pm_ops pxamci_pm_ops = {
858 .suspend = pxamci_suspend,
859 .resume = pxamci_resume,
860 };
861 #endif
862
863 static struct platform_driver pxamci_driver = {
864 .probe = pxamci_probe,
865 .remove = pxamci_remove,
866 .driver = {
867 .name = DRIVER_NAME,
868 .owner = THIS_MODULE,
869 #ifdef CONFIG_PM
870 .pm = &pxamci_pm_ops,
871 #endif
872 },
873 };
874
875 module_platform_driver(pxamci_driver);
876
877 MODULE_DESCRIPTION("PXA Multimedia Card Interface Driver");
878 MODULE_LICENSE("GPL");
879 MODULE_ALIAS("platform:pxa2xx-mci");