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PM / clk: Add support for adding a specific clock from device-tree
[deliverable/linux.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/dmaengine.h>
26 #include <linux/dma-mapping.h>
27 #include <linux/dma/pxa-dma.h>
28 #include <linux/clk.h>
29 #include <linux/err.h>
30 #include <linux/mmc/host.h>
31 #include <linux/mmc/slot-gpio.h>
32 #include <linux/io.h>
33 #include <linux/regulator/consumer.h>
34 #include <linux/gpio.h>
35 #include <linux/gfp.h>
36 #include <linux/of.h>
37 #include <linux/of_gpio.h>
38 #include <linux/of_device.h>
39
40 #include <asm/sizes.h>
41
42 #include <mach/hardware.h>
43 #include <linux/platform_data/mmc-pxamci.h>
44
45 #include "pxamci.h"
46
47 #define DRIVER_NAME "pxa2xx-mci"
48
49 #define NR_SG 1
50 #define CLKRT_OFF (~0)
51
52 #define mmc_has_26MHz() (cpu_is_pxa300() || cpu_is_pxa310() \
53 || cpu_is_pxa935())
54
55 struct pxamci_host {
56 struct mmc_host *mmc;
57 spinlock_t lock;
58 struct resource *res;
59 void __iomem *base;
60 struct clk *clk;
61 unsigned long clkrate;
62 int irq;
63 unsigned int clkrt;
64 unsigned int cmdat;
65 unsigned int imask;
66 unsigned int power_mode;
67 struct pxamci_platform_data *pdata;
68
69 struct mmc_request *mrq;
70 struct mmc_command *cmd;
71 struct mmc_data *data;
72
73 struct dma_chan *dma_chan_rx;
74 struct dma_chan *dma_chan_tx;
75 dma_cookie_t dma_cookie;
76 dma_addr_t sg_dma;
77 unsigned int dma_len;
78
79 unsigned int dma_dir;
80 unsigned int dma_drcmrrx;
81 unsigned int dma_drcmrtx;
82
83 struct regulator *vcc;
84 };
85
86 static inline void pxamci_init_ocr(struct pxamci_host *host)
87 {
88 #ifdef CONFIG_REGULATOR
89 host->vcc = devm_regulator_get_optional(mmc_dev(host->mmc), "vmmc");
90
91 if (IS_ERR(host->vcc))
92 host->vcc = NULL;
93 else {
94 host->mmc->ocr_avail = mmc_regulator_get_ocrmask(host->vcc);
95 if (host->pdata && host->pdata->ocr_mask)
96 dev_warn(mmc_dev(host->mmc),
97 "ocr_mask/setpower will not be used\n");
98 }
99 #endif
100 if (host->vcc == NULL) {
101 /* fall-back to platform data */
102 host->mmc->ocr_avail = host->pdata ?
103 host->pdata->ocr_mask :
104 MMC_VDD_32_33 | MMC_VDD_33_34;
105 }
106 }
107
108 static inline int pxamci_set_power(struct pxamci_host *host,
109 unsigned char power_mode,
110 unsigned int vdd)
111 {
112 int on;
113
114 if (host->vcc) {
115 int ret;
116
117 if (power_mode == MMC_POWER_UP) {
118 ret = mmc_regulator_set_ocr(host->mmc, host->vcc, vdd);
119 if (ret)
120 return ret;
121 } else if (power_mode == MMC_POWER_OFF) {
122 ret = mmc_regulator_set_ocr(host->mmc, host->vcc, 0);
123 if (ret)
124 return ret;
125 }
126 }
127 if (!host->vcc && host->pdata &&
128 gpio_is_valid(host->pdata->gpio_power)) {
129 on = ((1 << vdd) & host->pdata->ocr_mask);
130 gpio_set_value(host->pdata->gpio_power,
131 !!on ^ host->pdata->gpio_power_invert);
132 }
133 if (!host->vcc && host->pdata && host->pdata->setpower)
134 return host->pdata->setpower(mmc_dev(host->mmc), vdd);
135
136 return 0;
137 }
138
139 static void pxamci_stop_clock(struct pxamci_host *host)
140 {
141 if (readl(host->base + MMC_STAT) & STAT_CLK_EN) {
142 unsigned long timeout = 10000;
143 unsigned int v;
144
145 writel(STOP_CLOCK, host->base + MMC_STRPCL);
146
147 do {
148 v = readl(host->base + MMC_STAT);
149 if (!(v & STAT_CLK_EN))
150 break;
151 udelay(1);
152 } while (timeout--);
153
154 if (v & STAT_CLK_EN)
155 dev_err(mmc_dev(host->mmc), "unable to stop clock\n");
156 }
157 }
158
159 static void pxamci_enable_irq(struct pxamci_host *host, unsigned int mask)
160 {
161 unsigned long flags;
162
163 spin_lock_irqsave(&host->lock, flags);
164 host->imask &= ~mask;
165 writel(host->imask, host->base + MMC_I_MASK);
166 spin_unlock_irqrestore(&host->lock, flags);
167 }
168
169 static void pxamci_disable_irq(struct pxamci_host *host, unsigned int mask)
170 {
171 unsigned long flags;
172
173 spin_lock_irqsave(&host->lock, flags);
174 host->imask |= mask;
175 writel(host->imask, host->base + MMC_I_MASK);
176 spin_unlock_irqrestore(&host->lock, flags);
177 }
178
179 static void pxamci_dma_irq(void *param);
180
181 static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data)
182 {
183 struct dma_async_tx_descriptor *tx;
184 enum dma_data_direction direction;
185 struct dma_slave_config config;
186 struct dma_chan *chan;
187 unsigned int nob = data->blocks;
188 unsigned long long clks;
189 unsigned int timeout;
190 int ret;
191
192 host->data = data;
193
194 writel(nob, host->base + MMC_NOB);
195 writel(data->blksz, host->base + MMC_BLKLEN);
196
197 clks = (unsigned long long)data->timeout_ns * host->clkrate;
198 do_div(clks, 1000000000UL);
199 timeout = (unsigned int)clks + (data->timeout_clks << host->clkrt);
200 writel((timeout + 255) / 256, host->base + MMC_RDTO);
201
202 memset(&config, 0, sizeof(config));
203 config.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
204 config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
205 config.src_addr = host->res->start + MMC_RXFIFO;
206 config.dst_addr = host->res->start + MMC_TXFIFO;
207 config.src_maxburst = 32;
208 config.dst_maxburst = 32;
209
210 if (data->flags & MMC_DATA_READ) {
211 host->dma_dir = DMA_FROM_DEVICE;
212 direction = DMA_DEV_TO_MEM;
213 chan = host->dma_chan_rx;
214 } else {
215 host->dma_dir = DMA_TO_DEVICE;
216 direction = DMA_MEM_TO_DEV;
217 chan = host->dma_chan_tx;
218 }
219
220 config.direction = direction;
221
222 ret = dmaengine_slave_config(chan, &config);
223 if (ret < 0) {
224 dev_err(mmc_dev(host->mmc), "dma slave config failed\n");
225 return;
226 }
227
228 host->dma_len = dma_map_sg(chan->device->dev, data->sg, data->sg_len,
229 host->dma_dir);
230
231 tx = dmaengine_prep_slave_sg(chan, data->sg, host->dma_len, direction,
232 DMA_PREP_INTERRUPT);
233 if (!tx) {
234 dev_err(mmc_dev(host->mmc), "prep_slave_sg() failed\n");
235 return;
236 }
237
238 if (!(data->flags & MMC_DATA_READ)) {
239 tx->callback = pxamci_dma_irq;
240 tx->callback_param = host;
241 }
242
243 host->dma_cookie = dmaengine_submit(tx);
244
245 /*
246 * workaround for erratum #91:
247 * only start DMA now if we are doing a read,
248 * otherwise we wait until CMD/RESP has finished
249 * before starting DMA.
250 */
251 if (!cpu_is_pxa27x() || data->flags & MMC_DATA_READ)
252 dma_async_issue_pending(chan);
253 }
254
255 static void pxamci_start_cmd(struct pxamci_host *host, struct mmc_command *cmd, unsigned int cmdat)
256 {
257 WARN_ON(host->cmd != NULL);
258 host->cmd = cmd;
259
260 if (cmd->flags & MMC_RSP_BUSY)
261 cmdat |= CMDAT_BUSY;
262
263 #define RSP_TYPE(x) ((x) & ~(MMC_RSP_BUSY|MMC_RSP_OPCODE))
264 switch (RSP_TYPE(mmc_resp_type(cmd))) {
265 case RSP_TYPE(MMC_RSP_R1): /* r1, r1b, r6, r7 */
266 cmdat |= CMDAT_RESP_SHORT;
267 break;
268 case RSP_TYPE(MMC_RSP_R3):
269 cmdat |= CMDAT_RESP_R3;
270 break;
271 case RSP_TYPE(MMC_RSP_R2):
272 cmdat |= CMDAT_RESP_R2;
273 break;
274 default:
275 break;
276 }
277
278 writel(cmd->opcode, host->base + MMC_CMD);
279 writel(cmd->arg >> 16, host->base + MMC_ARGH);
280 writel(cmd->arg & 0xffff, host->base + MMC_ARGL);
281 writel(cmdat, host->base + MMC_CMDAT);
282 writel(host->clkrt, host->base + MMC_CLKRT);
283
284 writel(START_CLOCK, host->base + MMC_STRPCL);
285
286 pxamci_enable_irq(host, END_CMD_RES);
287 }
288
289 static void pxamci_finish_request(struct pxamci_host *host, struct mmc_request *mrq)
290 {
291 host->mrq = NULL;
292 host->cmd = NULL;
293 host->data = NULL;
294 mmc_request_done(host->mmc, mrq);
295 }
296
297 static int pxamci_cmd_done(struct pxamci_host *host, unsigned int stat)
298 {
299 struct mmc_command *cmd = host->cmd;
300 int i;
301 u32 v;
302
303 if (!cmd)
304 return 0;
305
306 host->cmd = NULL;
307
308 /*
309 * Did I mention this is Sick. We always need to
310 * discard the upper 8 bits of the first 16-bit word.
311 */
312 v = readl(host->base + MMC_RES) & 0xffff;
313 for (i = 0; i < 4; i++) {
314 u32 w1 = readl(host->base + MMC_RES) & 0xffff;
315 u32 w2 = readl(host->base + MMC_RES) & 0xffff;
316 cmd->resp[i] = v << 24 | w1 << 8 | w2 >> 8;
317 v = w2;
318 }
319
320 if (stat & STAT_TIME_OUT_RESPONSE) {
321 cmd->error = -ETIMEDOUT;
322 } else if (stat & STAT_RES_CRC_ERR && cmd->flags & MMC_RSP_CRC) {
323 /*
324 * workaround for erratum #42:
325 * Intel PXA27x Family Processor Specification Update Rev 001
326 * A bogus CRC error can appear if the msb of a 136 bit
327 * response is a one.
328 */
329 if (cpu_is_pxa27x() &&
330 (cmd->flags & MMC_RSP_136 && cmd->resp[0] & 0x80000000))
331 pr_debug("ignoring CRC from command %d - *risky*\n", cmd->opcode);
332 else
333 cmd->error = -EILSEQ;
334 }
335
336 pxamci_disable_irq(host, END_CMD_RES);
337 if (host->data && !cmd->error) {
338 pxamci_enable_irq(host, DATA_TRAN_DONE);
339 /*
340 * workaround for erratum #91, if doing write
341 * enable DMA late
342 */
343 if (cpu_is_pxa27x() && host->data->flags & MMC_DATA_WRITE)
344 dma_async_issue_pending(host->dma_chan_tx);
345 } else {
346 pxamci_finish_request(host, host->mrq);
347 }
348
349 return 1;
350 }
351
352 static int pxamci_data_done(struct pxamci_host *host, unsigned int stat)
353 {
354 struct mmc_data *data = host->data;
355 struct dma_chan *chan;
356
357 if (!data)
358 return 0;
359
360 if (data->flags & MMC_DATA_READ)
361 chan = host->dma_chan_rx;
362 else
363 chan = host->dma_chan_tx;
364 dma_unmap_sg(chan->device->dev,
365 data->sg, data->sg_len, host->dma_dir);
366
367 if (stat & STAT_READ_TIME_OUT)
368 data->error = -ETIMEDOUT;
369 else if (stat & (STAT_CRC_READ_ERROR|STAT_CRC_WRITE_ERROR))
370 data->error = -EILSEQ;
371
372 /*
373 * There appears to be a hardware design bug here. There seems to
374 * be no way to find out how much data was transferred to the card.
375 * This means that if there was an error on any block, we mark all
376 * data blocks as being in error.
377 */
378 if (!data->error)
379 data->bytes_xfered = data->blocks * data->blksz;
380 else
381 data->bytes_xfered = 0;
382
383 pxamci_disable_irq(host, DATA_TRAN_DONE);
384
385 host->data = NULL;
386 if (host->mrq->stop) {
387 pxamci_stop_clock(host);
388 pxamci_start_cmd(host, host->mrq->stop, host->cmdat);
389 } else {
390 pxamci_finish_request(host, host->mrq);
391 }
392
393 return 1;
394 }
395
396 static irqreturn_t pxamci_irq(int irq, void *devid)
397 {
398 struct pxamci_host *host = devid;
399 unsigned int ireg;
400 int handled = 0;
401
402 ireg = readl(host->base + MMC_I_REG) & ~readl(host->base + MMC_I_MASK);
403
404 if (ireg) {
405 unsigned stat = readl(host->base + MMC_STAT);
406
407 pr_debug("PXAMCI: irq %08x stat %08x\n", ireg, stat);
408
409 if (ireg & END_CMD_RES)
410 handled |= pxamci_cmd_done(host, stat);
411 if (ireg & DATA_TRAN_DONE)
412 handled |= pxamci_data_done(host, stat);
413 if (ireg & SDIO_INT) {
414 mmc_signal_sdio_irq(host->mmc);
415 handled = 1;
416 }
417 }
418
419 return IRQ_RETVAL(handled);
420 }
421
422 static void pxamci_request(struct mmc_host *mmc, struct mmc_request *mrq)
423 {
424 struct pxamci_host *host = mmc_priv(mmc);
425 unsigned int cmdat;
426
427 WARN_ON(host->mrq != NULL);
428
429 host->mrq = mrq;
430
431 pxamci_stop_clock(host);
432
433 cmdat = host->cmdat;
434 host->cmdat &= ~CMDAT_INIT;
435
436 if (mrq->data) {
437 pxamci_setup_data(host, mrq->data);
438
439 cmdat &= ~CMDAT_BUSY;
440 cmdat |= CMDAT_DATAEN | CMDAT_DMAEN;
441 if (mrq->data->flags & MMC_DATA_WRITE)
442 cmdat |= CMDAT_WRITE;
443 }
444
445 pxamci_start_cmd(host, mrq->cmd, cmdat);
446 }
447
448 static int pxamci_get_ro(struct mmc_host *mmc)
449 {
450 struct pxamci_host *host = mmc_priv(mmc);
451
452 if (host->pdata && gpio_is_valid(host->pdata->gpio_card_ro))
453 return mmc_gpio_get_ro(mmc);
454 if (host->pdata && host->pdata->get_ro)
455 return !!host->pdata->get_ro(mmc_dev(mmc));
456 /*
457 * Board doesn't support read only detection; let the mmc core
458 * decide what to do.
459 */
460 return -ENOSYS;
461 }
462
463 static void pxamci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
464 {
465 struct pxamci_host *host = mmc_priv(mmc);
466
467 if (ios->clock) {
468 unsigned long rate = host->clkrate;
469 unsigned int clk = rate / ios->clock;
470
471 if (host->clkrt == CLKRT_OFF)
472 clk_prepare_enable(host->clk);
473
474 if (ios->clock == 26000000) {
475 /* to support 26MHz */
476 host->clkrt = 7;
477 } else {
478 /* to handle (19.5MHz, 26MHz) */
479 if (!clk)
480 clk = 1;
481
482 /*
483 * clk might result in a lower divisor than we
484 * desire. check for that condition and adjust
485 * as appropriate.
486 */
487 if (rate / clk > ios->clock)
488 clk <<= 1;
489 host->clkrt = fls(clk) - 1;
490 }
491
492 /*
493 * we write clkrt on the next command
494 */
495 } else {
496 pxamci_stop_clock(host);
497 if (host->clkrt != CLKRT_OFF) {
498 host->clkrt = CLKRT_OFF;
499 clk_disable_unprepare(host->clk);
500 }
501 }
502
503 if (host->power_mode != ios->power_mode) {
504 int ret;
505
506 host->power_mode = ios->power_mode;
507
508 ret = pxamci_set_power(host, ios->power_mode, ios->vdd);
509 if (ret) {
510 dev_err(mmc_dev(mmc), "unable to set power\n");
511 /*
512 * The .set_ios() function in the mmc_host_ops
513 * struct return void, and failing to set the
514 * power should be rare so we print an error and
515 * return here.
516 */
517 return;
518 }
519
520 if (ios->power_mode == MMC_POWER_ON)
521 host->cmdat |= CMDAT_INIT;
522 }
523
524 if (ios->bus_width == MMC_BUS_WIDTH_4)
525 host->cmdat |= CMDAT_SD_4DAT;
526 else
527 host->cmdat &= ~CMDAT_SD_4DAT;
528
529 dev_dbg(mmc_dev(mmc), "PXAMCI: clkrt = %x cmdat = %x\n",
530 host->clkrt, host->cmdat);
531 }
532
533 static void pxamci_enable_sdio_irq(struct mmc_host *host, int enable)
534 {
535 struct pxamci_host *pxa_host = mmc_priv(host);
536
537 if (enable)
538 pxamci_enable_irq(pxa_host, SDIO_INT);
539 else
540 pxamci_disable_irq(pxa_host, SDIO_INT);
541 }
542
543 static const struct mmc_host_ops pxamci_ops = {
544 .request = pxamci_request,
545 .get_cd = mmc_gpio_get_cd,
546 .get_ro = pxamci_get_ro,
547 .set_ios = pxamci_set_ios,
548 .enable_sdio_irq = pxamci_enable_sdio_irq,
549 };
550
551 static void pxamci_dma_irq(void *param)
552 {
553 struct pxamci_host *host = param;
554 struct dma_tx_state state;
555 enum dma_status status;
556 struct dma_chan *chan;
557 unsigned long flags;
558
559 spin_lock_irqsave(&host->lock, flags);
560
561 if (!host->data)
562 goto out_unlock;
563
564 if (host->data->flags & MMC_DATA_READ)
565 chan = host->dma_chan_rx;
566 else
567 chan = host->dma_chan_tx;
568
569 status = dmaengine_tx_status(chan, host->dma_cookie, &state);
570
571 if (likely(status == DMA_COMPLETE)) {
572 writel(BUF_PART_FULL, host->base + MMC_PRTBUF);
573 } else {
574 pr_err("%s: DMA error on %s channel\n", mmc_hostname(host->mmc),
575 host->data->flags & MMC_DATA_READ ? "rx" : "tx");
576 host->data->error = -EIO;
577 pxamci_data_done(host, 0);
578 }
579
580 out_unlock:
581 spin_unlock_irqrestore(&host->lock, flags);
582 }
583
584 static irqreturn_t pxamci_detect_irq(int irq, void *devid)
585 {
586 struct pxamci_host *host = mmc_priv(devid);
587
588 mmc_detect_change(devid, msecs_to_jiffies(host->pdata->detect_delay_ms));
589 return IRQ_HANDLED;
590 }
591
592 #ifdef CONFIG_OF
593 static const struct of_device_id pxa_mmc_dt_ids[] = {
594 { .compatible = "marvell,pxa-mmc" },
595 { }
596 };
597
598 MODULE_DEVICE_TABLE(of, pxa_mmc_dt_ids);
599
600 static int pxamci_of_init(struct platform_device *pdev)
601 {
602 struct device_node *np = pdev->dev.of_node;
603 struct pxamci_platform_data *pdata;
604 u32 tmp;
605
606 if (!np)
607 return 0;
608
609 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
610 if (!pdata)
611 return -ENOMEM;
612
613 pdata->gpio_card_detect =
614 of_get_named_gpio(np, "cd-gpios", 0);
615 pdata->gpio_card_ro =
616 of_get_named_gpio(np, "wp-gpios", 0);
617
618 /* pxa-mmc specific */
619 pdata->gpio_power =
620 of_get_named_gpio(np, "pxa-mmc,gpio-power", 0);
621
622 if (of_property_read_u32(np, "pxa-mmc,detect-delay-ms", &tmp) == 0)
623 pdata->detect_delay_ms = tmp;
624
625 pdev->dev.platform_data = pdata;
626
627 return 0;
628 }
629 #else
630 static int pxamci_of_init(struct platform_device *pdev)
631 {
632 return 0;
633 }
634 #endif
635
636 static int pxamci_probe(struct platform_device *pdev)
637 {
638 struct mmc_host *mmc;
639 struct pxamci_host *host = NULL;
640 struct resource *r, *dmarx, *dmatx;
641 struct pxad_param param_rx, param_tx;
642 int ret, irq, gpio_cd = -1, gpio_ro = -1, gpio_power = -1;
643 dma_cap_mask_t mask;
644
645 ret = pxamci_of_init(pdev);
646 if (ret)
647 return ret;
648
649 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
650 irq = platform_get_irq(pdev, 0);
651 if (irq < 0)
652 return irq;
653
654 mmc = mmc_alloc_host(sizeof(struct pxamci_host), &pdev->dev);
655 if (!mmc) {
656 ret = -ENOMEM;
657 goto out;
658 }
659
660 mmc->ops = &pxamci_ops;
661
662 /*
663 * We can do SG-DMA, but we don't because we never know how much
664 * data we successfully wrote to the card.
665 */
666 mmc->max_segs = NR_SG;
667
668 /*
669 * Our hardware DMA can handle a maximum of one page per SG entry.
670 */
671 mmc->max_seg_size = PAGE_SIZE;
672
673 /*
674 * Block length register is only 10 bits before PXA27x.
675 */
676 mmc->max_blk_size = cpu_is_pxa25x() ? 1023 : 2048;
677
678 /*
679 * Block count register is 16 bits.
680 */
681 mmc->max_blk_count = 65535;
682
683 host = mmc_priv(mmc);
684 host->mmc = mmc;
685 host->pdata = pdev->dev.platform_data;
686 host->clkrt = CLKRT_OFF;
687
688 host->clk = devm_clk_get(&pdev->dev, NULL);
689 if (IS_ERR(host->clk)) {
690 ret = PTR_ERR(host->clk);
691 host->clk = NULL;
692 goto out;
693 }
694
695 host->clkrate = clk_get_rate(host->clk);
696
697 /*
698 * Calculate minimum clock rate, rounding up.
699 */
700 mmc->f_min = (host->clkrate + 63) / 64;
701 mmc->f_max = (mmc_has_26MHz()) ? 26000000 : host->clkrate;
702
703 pxamci_init_ocr(host);
704
705 mmc->caps = 0;
706 host->cmdat = 0;
707 if (!cpu_is_pxa25x()) {
708 mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
709 host->cmdat |= CMDAT_SDIO_INT_EN;
710 if (mmc_has_26MHz())
711 mmc->caps |= MMC_CAP_MMC_HIGHSPEED |
712 MMC_CAP_SD_HIGHSPEED;
713 }
714
715 spin_lock_init(&host->lock);
716 host->res = r;
717 host->irq = irq;
718 host->imask = MMC_I_MASK_ALL;
719
720 host->base = devm_ioremap_resource(&pdev->dev, r);
721 if (IS_ERR(host->base)) {
722 ret = PTR_ERR(host->base);
723 goto out;
724 }
725
726 /*
727 * Ensure that the host controller is shut down, and setup
728 * with our defaults.
729 */
730 pxamci_stop_clock(host);
731 writel(0, host->base + MMC_SPI);
732 writel(64, host->base + MMC_RESTO);
733 writel(host->imask, host->base + MMC_I_MASK);
734
735 ret = devm_request_irq(&pdev->dev, host->irq, pxamci_irq, 0,
736 DRIVER_NAME, host);
737 if (ret)
738 goto out;
739
740 platform_set_drvdata(pdev, mmc);
741
742 if (!pdev->dev.of_node) {
743 dmarx = platform_get_resource(pdev, IORESOURCE_DMA, 0);
744 dmatx = platform_get_resource(pdev, IORESOURCE_DMA, 1);
745 if (!dmarx || !dmatx) {
746 ret = -ENXIO;
747 goto out;
748 }
749 param_rx.prio = PXAD_PRIO_LOWEST;
750 param_rx.drcmr = dmarx->start;
751 param_tx.prio = PXAD_PRIO_LOWEST;
752 param_tx.drcmr = dmatx->start;
753 }
754
755 dma_cap_zero(mask);
756 dma_cap_set(DMA_SLAVE, mask);
757
758 host->dma_chan_rx =
759 dma_request_slave_channel_compat(mask, pxad_filter_fn,
760 &param_rx, &pdev->dev, "rx");
761 if (host->dma_chan_rx == NULL) {
762 dev_err(&pdev->dev, "unable to request rx dma channel\n");
763 ret = -ENODEV;
764 goto out;
765 }
766
767 host->dma_chan_tx =
768 dma_request_slave_channel_compat(mask, pxad_filter_fn,
769 &param_tx, &pdev->dev, "tx");
770 if (host->dma_chan_tx == NULL) {
771 dev_err(&pdev->dev, "unable to request tx dma channel\n");
772 ret = -ENODEV;
773 goto out;
774 }
775
776 if (host->pdata) {
777 gpio_cd = host->pdata->gpio_card_detect;
778 gpio_ro = host->pdata->gpio_card_ro;
779 gpio_power = host->pdata->gpio_power;
780 }
781 if (gpio_is_valid(gpio_power)) {
782 ret = devm_gpio_request(&pdev->dev, gpio_power,
783 "mmc card power");
784 if (ret) {
785 dev_err(&pdev->dev, "Failed requesting gpio_power %d\n",
786 gpio_power);
787 goto out;
788 }
789 gpio_direction_output(gpio_power,
790 host->pdata->gpio_power_invert);
791 }
792 if (gpio_is_valid(gpio_ro))
793 ret = mmc_gpio_request_ro(mmc, gpio_ro);
794 if (ret) {
795 dev_err(&pdev->dev, "Failed requesting gpio_ro %d\n", gpio_ro);
796 goto out;
797 } else {
798 mmc->caps2 |= host->pdata->gpio_card_ro_invert ?
799 0 : MMC_CAP2_RO_ACTIVE_HIGH;
800 }
801
802 if (gpio_is_valid(gpio_cd))
803 ret = mmc_gpio_request_cd(mmc, gpio_cd, 0);
804 if (ret) {
805 dev_err(&pdev->dev, "Failed requesting gpio_cd %d\n", gpio_cd);
806 goto out;
807 }
808
809 if (host->pdata && host->pdata->init)
810 host->pdata->init(&pdev->dev, pxamci_detect_irq, mmc);
811
812 if (gpio_is_valid(gpio_power) && host->pdata->setpower)
813 dev_warn(&pdev->dev, "gpio_power and setpower() both defined\n");
814 if (gpio_is_valid(gpio_ro) && host->pdata->get_ro)
815 dev_warn(&pdev->dev, "gpio_ro and get_ro() both defined\n");
816
817 mmc_add_host(mmc);
818
819 return 0;
820
821 out:
822 if (host) {
823 if (host->dma_chan_rx)
824 dma_release_channel(host->dma_chan_rx);
825 if (host->dma_chan_tx)
826 dma_release_channel(host->dma_chan_tx);
827 }
828 if (mmc)
829 mmc_free_host(mmc);
830 return ret;
831 }
832
833 static int pxamci_remove(struct platform_device *pdev)
834 {
835 struct mmc_host *mmc = platform_get_drvdata(pdev);
836 int gpio_cd = -1, gpio_ro = -1, gpio_power = -1;
837
838 if (mmc) {
839 struct pxamci_host *host = mmc_priv(mmc);
840
841 mmc_remove_host(mmc);
842
843 if (host->pdata) {
844 gpio_cd = host->pdata->gpio_card_detect;
845 gpio_ro = host->pdata->gpio_card_ro;
846 gpio_power = host->pdata->gpio_power;
847 }
848 if (host->pdata && host->pdata->exit)
849 host->pdata->exit(&pdev->dev, mmc);
850
851 pxamci_stop_clock(host);
852 writel(TXFIFO_WR_REQ|RXFIFO_RD_REQ|CLK_IS_OFF|STOP_CMD|
853 END_CMD_RES|PRG_DONE|DATA_TRAN_DONE,
854 host->base + MMC_I_MASK);
855
856 dmaengine_terminate_all(host->dma_chan_rx);
857 dmaengine_terminate_all(host->dma_chan_tx);
858 dma_release_channel(host->dma_chan_rx);
859 dma_release_channel(host->dma_chan_tx);
860
861 mmc_free_host(mmc);
862 }
863 return 0;
864 }
865
866 static struct platform_driver pxamci_driver = {
867 .probe = pxamci_probe,
868 .remove = pxamci_remove,
869 .driver = {
870 .name = DRIVER_NAME,
871 .of_match_table = of_match_ptr(pxa_mmc_dt_ids),
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");
Linux kernel - Deliverables
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