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sh_eth: fix EESIPR values for SH77{34|63}
[linux/fpc-iii.git] / drivers / mmc / host / mxs-mmc.c
blob44ecebd1ea8c1834a5d311fbe36ddfc8383e3ecd
1 /*
2 * Portions copyright (C) 2003 Russell King, PXA MMCI Driver
3 * Portions copyright (C) 2004-2005 Pierre Ossman, W83L51xD SD/MMC driver
4 *
5 * Copyright 2008 Embedded Alley Solutions, Inc.
6 * Copyright 2009-2011 Freescale Semiconductor, Inc.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 */
22
23 #include <linux/kernel.h>
24 #include <linux/init.h>
25 #include <linux/ioport.h>
26 #include <linux/of.h>
27 #include <linux/of_device.h>
28 #include <linux/of_gpio.h>
29 #include <linux/platform_device.h>
30 #include <linux/delay.h>
31 #include <linux/interrupt.h>
32 #include <linux/dma-mapping.h>
33 #include <linux/dmaengine.h>
34 #include <linux/highmem.h>
35 #include <linux/clk.h>
36 #include <linux/err.h>
37 #include <linux/completion.h>
38 #include <linux/mmc/host.h>
39 #include <linux/mmc/mmc.h>
40 #include <linux/mmc/sdio.h>
41 #include <linux/mmc/slot-gpio.h>
42 #include <linux/gpio.h>
43 #include <linux/regulator/consumer.h>
44 #include <linux/module.h>
45 #include <linux/stmp_device.h>
46 #include <linux/spi/mxs-spi.h>
47
48 #define DRIVER_NAME "mxs-mmc"
49
50 #define MXS_MMC_IRQ_BITS (BM_SSP_CTRL1_SDIO_IRQ | \
51 BM_SSP_CTRL1_RESP_ERR_IRQ | \
52 BM_SSP_CTRL1_RESP_TIMEOUT_IRQ | \
53 BM_SSP_CTRL1_DATA_TIMEOUT_IRQ | \
54 BM_SSP_CTRL1_DATA_CRC_IRQ | \
55 BM_SSP_CTRL1_FIFO_UNDERRUN_IRQ | \
56 BM_SSP_CTRL1_RECV_TIMEOUT_IRQ | \
57 BM_SSP_CTRL1_FIFO_OVERRUN_IRQ)
58
59 /* card detect polling timeout */
60 #define MXS_MMC_DETECT_TIMEOUT (HZ/2)
61
62 struct mxs_mmc_host {
63 struct mxs_ssp ssp;
64
65 struct mmc_host *mmc;
66 struct mmc_request *mrq;
67 struct mmc_command *cmd;
68 struct mmc_data *data;
69
70 unsigned char bus_width;
71 spinlock_t lock;
72 int sdio_irq_en;
73 bool broken_cd;
74 };
75
76 static int mxs_mmc_get_cd(struct mmc_host *mmc)
77 {
78 struct mxs_mmc_host *host = mmc_priv(mmc);
79 struct mxs_ssp *ssp = &host->ssp;
80 int present, ret;
81
82 if (host->broken_cd)
83 return -ENOSYS;
84
85 ret = mmc_gpio_get_cd(mmc);
86 if (ret >= 0)
87 return ret;
88
89 present = mmc->caps & MMC_CAP_NEEDS_POLL ||
90 !(readl(ssp->base + HW_SSP_STATUS(ssp)) &
91 BM_SSP_STATUS_CARD_DETECT);
92
93 if (mmc->caps2 & MMC_CAP2_CD_ACTIVE_HIGH)
94 present = !present;
95
96 return present;
97 }
98
99 static int mxs_mmc_reset(struct mxs_mmc_host *host)
100 {
101 struct mxs_ssp *ssp = &host->ssp;
102 u32 ctrl0, ctrl1;
103 int ret;
104
105 ret = stmp_reset_block(ssp->base);
106 if (ret)
107 return ret;
108
109 ctrl0 = BM_SSP_CTRL0_IGNORE_CRC;
110 ctrl1 = BF_SSP(0x3, CTRL1_SSP_MODE) |
111 BF_SSP(0x7, CTRL1_WORD_LENGTH) |
112 BM_SSP_CTRL1_DMA_ENABLE |
113 BM_SSP_CTRL1_POLARITY |
114 BM_SSP_CTRL1_RECV_TIMEOUT_IRQ_EN |
115 BM_SSP_CTRL1_DATA_CRC_IRQ_EN |
116 BM_SSP_CTRL1_DATA_TIMEOUT_IRQ_EN |
117 BM_SSP_CTRL1_RESP_TIMEOUT_IRQ_EN |
118 BM_SSP_CTRL1_RESP_ERR_IRQ_EN;
119
120 writel(BF_SSP(0xffff, TIMING_TIMEOUT) |
121 BF_SSP(2, TIMING_CLOCK_DIVIDE) |
122 BF_SSP(0, TIMING_CLOCK_RATE),
123 ssp->base + HW_SSP_TIMING(ssp));
124
125 if (host->sdio_irq_en) {
126 ctrl0 |= BM_SSP_CTRL0_SDIO_IRQ_CHECK;
127 ctrl1 |= BM_SSP_CTRL1_SDIO_IRQ_EN;
128 }
129
130 writel(ctrl0, ssp->base + HW_SSP_CTRL0);
131 writel(ctrl1, ssp->base + HW_SSP_CTRL1(ssp));
132 return 0;
133 }
134
135 static void mxs_mmc_start_cmd(struct mxs_mmc_host *host,
136 struct mmc_command *cmd);
137
138 static void mxs_mmc_request_done(struct mxs_mmc_host *host)
139 {
140 struct mmc_command *cmd = host->cmd;
141 struct mmc_data *data = host->data;
142 struct mmc_request *mrq = host->mrq;
143 struct mxs_ssp *ssp = &host->ssp;
144
145 if (mmc_resp_type(cmd) & MMC_RSP_PRESENT) {
146 if (mmc_resp_type(cmd) & MMC_RSP_136) {
147 cmd->resp[3] = readl(ssp->base + HW_SSP_SDRESP0(ssp));
148 cmd->resp[2] = readl(ssp->base + HW_SSP_SDRESP1(ssp));
149 cmd->resp[1] = readl(ssp->base + HW_SSP_SDRESP2(ssp));
150 cmd->resp[0] = readl(ssp->base + HW_SSP_SDRESP3(ssp));
151 } else {
152 cmd->resp[0] = readl(ssp->base + HW_SSP_SDRESP0(ssp));
153 }
154 }
155
156 if (data) {
157 dma_unmap_sg(mmc_dev(host->mmc), data->sg,
158 data->sg_len, ssp->dma_dir);
159 /*
160 * If there was an error on any block, we mark all
161 * data blocks as being in error.
162 */
163 if (!data->error)
164 data->bytes_xfered = data->blocks * data->blksz;
165 else
166 data->bytes_xfered = 0;
167
168 host->data = NULL;
169 if (mrq->stop) {
170 mxs_mmc_start_cmd(host, mrq->stop);
171 return;
172 }
173 }
174
175 host->mrq = NULL;
176 mmc_request_done(host->mmc, mrq);
177 }
178
179 static void mxs_mmc_dma_irq_callback(void *param)
180 {
181 struct mxs_mmc_host *host = param;
182
183 mxs_mmc_request_done(host);
184 }
185
186 static irqreturn_t mxs_mmc_irq_handler(int irq, void *dev_id)
187 {
188 struct mxs_mmc_host *host = dev_id;
189 struct mmc_command *cmd = host->cmd;
190 struct mmc_data *data = host->data;
191 struct mxs_ssp *ssp = &host->ssp;
192 u32 stat;
193
194 spin_lock(&host->lock);
195
196 stat = readl(ssp->base + HW_SSP_CTRL1(ssp));
197 writel(stat & MXS_MMC_IRQ_BITS,
198 ssp->base + HW_SSP_CTRL1(ssp) + STMP_OFFSET_REG_CLR);
199
200 spin_unlock(&host->lock);
201
202 if ((stat & BM_SSP_CTRL1_SDIO_IRQ) && (stat & BM_SSP_CTRL1_SDIO_IRQ_EN))
203 mmc_signal_sdio_irq(host->mmc);
204
205 if (stat & BM_SSP_CTRL1_RESP_TIMEOUT_IRQ)
206 cmd->error = -ETIMEDOUT;
207 else if (stat & BM_SSP_CTRL1_RESP_ERR_IRQ)
208 cmd->error = -EIO;
209
210 if (data) {
211 if (stat & (BM_SSP_CTRL1_DATA_TIMEOUT_IRQ |
212 BM_SSP_CTRL1_RECV_TIMEOUT_IRQ))
213 data->error = -ETIMEDOUT;
214 else if (stat & BM_SSP_CTRL1_DATA_CRC_IRQ)
215 data->error = -EILSEQ;
216 else if (stat & (BM_SSP_CTRL1_FIFO_UNDERRUN_IRQ |
217 BM_SSP_CTRL1_FIFO_OVERRUN_IRQ))
218 data->error = -EIO;
219 }
220
221 return IRQ_HANDLED;
222 }
223
224 static struct dma_async_tx_descriptor *mxs_mmc_prep_dma(
225 struct mxs_mmc_host *host, unsigned long flags)
226 {
227 struct mxs_ssp *ssp = &host->ssp;
228 struct dma_async_tx_descriptor *desc;
229 struct mmc_data *data = host->data;
230 struct scatterlist * sgl;
231 unsigned int sg_len;
232
233 if (data) {
234 /* data */
235 dma_map_sg(mmc_dev(host->mmc), data->sg,
236 data->sg_len, ssp->dma_dir);
237 sgl = data->sg;
238 sg_len = data->sg_len;
239 } else {
240 /* pio */
241 sgl = (struct scatterlist *) ssp->ssp_pio_words;
242 sg_len = SSP_PIO_NUM;
243 }
244
245 desc = dmaengine_prep_slave_sg(ssp->dmach,
246 sgl, sg_len, ssp->slave_dirn, flags);
247 if (desc) {
248 desc->callback = mxs_mmc_dma_irq_callback;
249 desc->callback_param = host;
250 } else {
251 if (data)
252 dma_unmap_sg(mmc_dev(host->mmc), data->sg,
253 data->sg_len, ssp->dma_dir);
254 }
255
256 return desc;
257 }
258
259 static void mxs_mmc_bc(struct mxs_mmc_host *host)
260 {
261 struct mxs_ssp *ssp = &host->ssp;
262 struct mmc_command *cmd = host->cmd;
263 struct dma_async_tx_descriptor *desc;
264 u32 ctrl0, cmd0, cmd1;
265
266 ctrl0 = BM_SSP_CTRL0_ENABLE | BM_SSP_CTRL0_IGNORE_CRC;
267 cmd0 = BF_SSP(cmd->opcode, CMD0_CMD) | BM_SSP_CMD0_APPEND_8CYC;
268 cmd1 = cmd->arg;
269
270 if (host->sdio_irq_en) {
271 ctrl0 |= BM_SSP_CTRL0_SDIO_IRQ_CHECK;
272 cmd0 |= BM_SSP_CMD0_CONT_CLKING_EN | BM_SSP_CMD0_SLOW_CLKING_EN;
273 }
274
275 ssp->ssp_pio_words[0] = ctrl0;
276 ssp->ssp_pio_words[1] = cmd0;
277 ssp->ssp_pio_words[2] = cmd1;
278 ssp->dma_dir = DMA_NONE;
279 ssp->slave_dirn = DMA_TRANS_NONE;
280 desc = mxs_mmc_prep_dma(host, DMA_CTRL_ACK);
281 if (!desc)
282 goto out;
283
284 dmaengine_submit(desc);
285 dma_async_issue_pending(ssp->dmach);
286 return;
287
288 out:
289 dev_warn(mmc_dev(host->mmc),
290 "%s: failed to prep dma\n", __func__);
291 }
292
293 static void mxs_mmc_ac(struct mxs_mmc_host *host)
294 {
295 struct mxs_ssp *ssp = &host->ssp;
296 struct mmc_command *cmd = host->cmd;
297 struct dma_async_tx_descriptor *desc;
298 u32 ignore_crc, get_resp, long_resp;
299 u32 ctrl0, cmd0, cmd1;
300
301 ignore_crc = (mmc_resp_type(cmd) & MMC_RSP_CRC) ?
302 0 : BM_SSP_CTRL0_IGNORE_CRC;
303 get_resp = (mmc_resp_type(cmd) & MMC_RSP_PRESENT) ?
304 BM_SSP_CTRL0_GET_RESP : 0;
305 long_resp = (mmc_resp_type(cmd) & MMC_RSP_136) ?
306 BM_SSP_CTRL0_LONG_RESP : 0;
307
308 ctrl0 = BM_SSP_CTRL0_ENABLE | ignore_crc | get_resp | long_resp;
309 cmd0 = BF_SSP(cmd->opcode, CMD0_CMD);
310 cmd1 = cmd->arg;
311
312 if (host->sdio_irq_en) {
313 ctrl0 |= BM_SSP_CTRL0_SDIO_IRQ_CHECK;
314 cmd0 |= BM_SSP_CMD0_CONT_CLKING_EN | BM_SSP_CMD0_SLOW_CLKING_EN;
315 }
316
317 ssp->ssp_pio_words[0] = ctrl0;
318 ssp->ssp_pio_words[1] = cmd0;
319 ssp->ssp_pio_words[2] = cmd1;
320 ssp->dma_dir = DMA_NONE;
321 ssp->slave_dirn = DMA_TRANS_NONE;
322 desc = mxs_mmc_prep_dma(host, DMA_CTRL_ACK);
323 if (!desc)
324 goto out;
325
326 dmaengine_submit(desc);
327 dma_async_issue_pending(ssp->dmach);
328 return;
329
330 out:
331 dev_warn(mmc_dev(host->mmc),
332 "%s: failed to prep dma\n", __func__);
333 }
334
335 static unsigned short mxs_ns_to_ssp_ticks(unsigned clock_rate, unsigned ns)
336 {
337 const unsigned int ssp_timeout_mul = 4096;
338 /*
339 * Calculate ticks in ms since ns are large numbers
340 * and might overflow
341 */
342 const unsigned int clock_per_ms = clock_rate / 1000;
343 const unsigned int ms = ns / 1000;
344 const unsigned int ticks = ms * clock_per_ms;
345 const unsigned int ssp_ticks = ticks / ssp_timeout_mul;
346
347 WARN_ON(ssp_ticks == 0);
348 return ssp_ticks;
349 }
350
351 static void mxs_mmc_adtc(struct mxs_mmc_host *host)
352 {
353 struct mmc_command *cmd = host->cmd;
354 struct mmc_data *data = cmd->data;
355 struct dma_async_tx_descriptor *desc;
356 struct scatterlist *sgl = data->sg, *sg;
357 unsigned int sg_len = data->sg_len;
358 unsigned int i;
359
360 unsigned short dma_data_dir, timeout;
361 enum dma_transfer_direction slave_dirn;
362 unsigned int data_size = 0, log2_blksz;
363 unsigned int blocks = data->blocks;
364
365 struct mxs_ssp *ssp = &host->ssp;
366
367 u32 ignore_crc, get_resp, long_resp, read;
368 u32 ctrl0, cmd0, cmd1, val;
369
370 ignore_crc = (mmc_resp_type(cmd) & MMC_RSP_CRC) ?
371 0 : BM_SSP_CTRL0_IGNORE_CRC;
372 get_resp = (mmc_resp_type(cmd) & MMC_RSP_PRESENT) ?
373 BM_SSP_CTRL0_GET_RESP : 0;
374 long_resp = (mmc_resp_type(cmd) & MMC_RSP_136) ?
375 BM_SSP_CTRL0_LONG_RESP : 0;
376
377 if (data->flags & MMC_DATA_WRITE) {
378 dma_data_dir = DMA_TO_DEVICE;
379 slave_dirn = DMA_MEM_TO_DEV;
380 read = 0;
381 } else {
382 dma_data_dir = DMA_FROM_DEVICE;
383 slave_dirn = DMA_DEV_TO_MEM;
384 read = BM_SSP_CTRL0_READ;
385 }
386
387 ctrl0 = BF_SSP(host->bus_width, CTRL0_BUS_WIDTH) |
388 ignore_crc | get_resp | long_resp |
389 BM_SSP_CTRL0_DATA_XFER | read |
390 BM_SSP_CTRL0_WAIT_FOR_IRQ |
391 BM_SSP_CTRL0_ENABLE;
392
393 cmd0 = BF_SSP(cmd->opcode, CMD0_CMD);
394
395 /* get logarithm to base 2 of block size for setting register */
396 log2_blksz = ilog2(data->blksz);
397
398 /*
399 * take special care of the case that data size from data->sg
400 * is not equal to blocks x blksz
401 */
402 for_each_sg(sgl, sg, sg_len, i)
403 data_size += sg->length;
404
405 if (data_size != data->blocks * data->blksz)
406 blocks = 1;
407
408 /* xfer count, block size and count need to be set differently */
409 if (ssp_is_old(ssp)) {
410 ctrl0 |= BF_SSP(data_size, CTRL0_XFER_COUNT);
411 cmd0 |= BF_SSP(log2_blksz, CMD0_BLOCK_SIZE) |
412 BF_SSP(blocks - 1, CMD0_BLOCK_COUNT);
413 } else {
414 writel(data_size, ssp->base + HW_SSP_XFER_SIZE);
415 writel(BF_SSP(log2_blksz, BLOCK_SIZE_BLOCK_SIZE) |
416 BF_SSP(blocks - 1, BLOCK_SIZE_BLOCK_COUNT),
417 ssp->base + HW_SSP_BLOCK_SIZE);
418 }
419
420 if ((cmd->opcode == MMC_STOP_TRANSMISSION) ||
421 (cmd->opcode == SD_IO_RW_EXTENDED))
422 cmd0 |= BM_SSP_CMD0_APPEND_8CYC;
423
424 cmd1 = cmd->arg;
425
426 if (host->sdio_irq_en) {
427 ctrl0 |= BM_SSP_CTRL0_SDIO_IRQ_CHECK;
428 cmd0 |= BM_SSP_CMD0_CONT_CLKING_EN | BM_SSP_CMD0_SLOW_CLKING_EN;
429 }
430
431 /* set the timeout count */
432 timeout = mxs_ns_to_ssp_ticks(ssp->clk_rate, data->timeout_ns);
433 val = readl(ssp->base + HW_SSP_TIMING(ssp));
434 val &= ~(BM_SSP_TIMING_TIMEOUT);
435 val |= BF_SSP(timeout, TIMING_TIMEOUT);
436 writel(val, ssp->base + HW_SSP_TIMING(ssp));
437
438 /* pio */
439 ssp->ssp_pio_words[0] = ctrl0;
440 ssp->ssp_pio_words[1] = cmd0;
441 ssp->ssp_pio_words[2] = cmd1;
442 ssp->dma_dir = DMA_NONE;
443 ssp->slave_dirn = DMA_TRANS_NONE;
444 desc = mxs_mmc_prep_dma(host, 0);
445 if (!desc)
446 goto out;
447
448 /* append data sg */
449 WARN_ON(host->data != NULL);
450 host->data = data;
451 ssp->dma_dir = dma_data_dir;
452 ssp->slave_dirn = slave_dirn;
453 desc = mxs_mmc_prep_dma(host, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
454 if (!desc)
455 goto out;
456
457 dmaengine_submit(desc);
458 dma_async_issue_pending(ssp->dmach);
459 return;
460 out:
461 dev_warn(mmc_dev(host->mmc),
462 "%s: failed to prep dma\n", __func__);
463 }
464
465 static void mxs_mmc_start_cmd(struct mxs_mmc_host *host,
466 struct mmc_command *cmd)
467 {
468 host->cmd = cmd;
469
470 switch (mmc_cmd_type(cmd)) {
471 case MMC_CMD_BC:
472 mxs_mmc_bc(host);
473 break;
474 case MMC_CMD_BCR:
475 mxs_mmc_ac(host);
476 break;
477 case MMC_CMD_AC:
478 mxs_mmc_ac(host);
479 break;
480 case MMC_CMD_ADTC:
481 mxs_mmc_adtc(host);
482 break;
483 default:
484 dev_warn(mmc_dev(host->mmc),
485 "%s: unknown MMC command\n", __func__);
486 break;
487 }
488 }
489
490 static void mxs_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
491 {
492 struct mxs_mmc_host *host = mmc_priv(mmc);
493
494 WARN_ON(host->mrq != NULL);
495 host->mrq = mrq;
496 mxs_mmc_start_cmd(host, mrq->cmd);
497 }
498
499 static void mxs_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
500 {
501 struct mxs_mmc_host *host = mmc_priv(mmc);
502
503 if (ios->bus_width == MMC_BUS_WIDTH_8)
504 host->bus_width = 2;
505 else if (ios->bus_width == MMC_BUS_WIDTH_4)
506 host->bus_width = 1;
507 else
508 host->bus_width = 0;
509
510 if (ios->clock)
511 mxs_ssp_set_clk_rate(&host->ssp, ios->clock);
512 }
513
514 static void mxs_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
515 {
516 struct mxs_mmc_host *host = mmc_priv(mmc);
517 struct mxs_ssp *ssp = &host->ssp;
518 unsigned long flags;
519
520 spin_lock_irqsave(&host->lock, flags);
521
522 host->sdio_irq_en = enable;
523
524 if (enable) {
525 writel(BM_SSP_CTRL0_SDIO_IRQ_CHECK,
526 ssp->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_SET);
527 writel(BM_SSP_CTRL1_SDIO_IRQ_EN,
528 ssp->base + HW_SSP_CTRL1(ssp) + STMP_OFFSET_REG_SET);
529 } else {
530 writel(BM_SSP_CTRL0_SDIO_IRQ_CHECK,
531 ssp->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_CLR);
532 writel(BM_SSP_CTRL1_SDIO_IRQ_EN,
533 ssp->base + HW_SSP_CTRL1(ssp) + STMP_OFFSET_REG_CLR);
534 }
535
536 spin_unlock_irqrestore(&host->lock, flags);
537
538 if (enable && readl(ssp->base + HW_SSP_STATUS(ssp)) &
539 BM_SSP_STATUS_SDIO_IRQ)
540 mmc_signal_sdio_irq(host->mmc);
541
542 }
543
544 static const struct mmc_host_ops mxs_mmc_ops = {
545 .request = mxs_mmc_request,
546 .get_ro = mmc_gpio_get_ro,
547 .get_cd = mxs_mmc_get_cd,
548 .set_ios = mxs_mmc_set_ios,
549 .enable_sdio_irq = mxs_mmc_enable_sdio_irq,
550 };
551
552 static const struct platform_device_id mxs_ssp_ids[] = {
553 {
554 .name = "imx23-mmc",
555 .driver_data = IMX23_SSP,
556 }, {
557 .name = "imx28-mmc",
558 .driver_data = IMX28_SSP,
559 }, {
560 /* sentinel */
561 }
562 };
563 MODULE_DEVICE_TABLE(platform, mxs_ssp_ids);
564
565 static const struct of_device_id mxs_mmc_dt_ids[] = {
566 { .compatible = "fsl,imx23-mmc", .data = (void *) IMX23_SSP, },
567 { .compatible = "fsl,imx28-mmc", .data = (void *) IMX28_SSP, },
568 { /* sentinel */ }
569 };
570 MODULE_DEVICE_TABLE(of, mxs_mmc_dt_ids);
571
572 static int mxs_mmc_probe(struct platform_device *pdev)
573 {
574 const struct of_device_id *of_id =
575 of_match_device(mxs_mmc_dt_ids, &pdev->dev);
576 struct device_node *np = pdev->dev.of_node;
577 struct mxs_mmc_host *host;
578 struct mmc_host *mmc;
579 struct resource *iores;
580 int ret = 0, irq_err;
581 struct regulator *reg_vmmc;
582 struct mxs_ssp *ssp;
583
584 irq_err = platform_get_irq(pdev, 0);
585 if (irq_err < 0)
586 return irq_err;
587
588 mmc = mmc_alloc_host(sizeof(struct mxs_mmc_host), &pdev->dev);
589 if (!mmc)
590 return -ENOMEM;
591
592 host = mmc_priv(mmc);
593 ssp = &host->ssp;
594 ssp->dev = &pdev->dev;
595 iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
596 ssp->base = devm_ioremap_resource(&pdev->dev, iores);
597 if (IS_ERR(ssp->base)) {
598 ret = PTR_ERR(ssp->base);
599 goto out_mmc_free;
600 }
601
602 ssp->devid = (enum mxs_ssp_id) of_id->data;
603
604 host->mmc = mmc;
605 host->sdio_irq_en = 0;
606
607 reg_vmmc = devm_regulator_get(&pdev->dev, "vmmc");
608 if (!IS_ERR(reg_vmmc)) {
609 ret = regulator_enable(reg_vmmc);
610 if (ret) {
611 dev_err(&pdev->dev,
612 "Failed to enable vmmc regulator: %d\n", ret);
613 goto out_mmc_free;
614 }
615 }
616
617 ssp->clk = devm_clk_get(&pdev->dev, NULL);
618 if (IS_ERR(ssp->clk)) {
619 ret = PTR_ERR(ssp->clk);
620 goto out_mmc_free;
621 }
622 ret = clk_prepare_enable(ssp->clk);
623 if (ret)
624 goto out_mmc_free;
625
626 ret = mxs_mmc_reset(host);
627 if (ret) {
628 dev_err(&pdev->dev, "Failed to reset mmc: %d\n", ret);
629 goto out_clk_disable;
630 }
631
632 ssp->dmach = dma_request_slave_channel(&pdev->dev, "rx-tx");
633 if (!ssp->dmach) {
634 dev_err(mmc_dev(host->mmc),
635 "%s: failed to request dma\n", __func__);
636 ret = -ENODEV;
637 goto out_clk_disable;
638 }
639
640 /* set mmc core parameters */
641 mmc->ops = &mxs_mmc_ops;
642 mmc->caps = MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED |
643 MMC_CAP_SDIO_IRQ | MMC_CAP_NEEDS_POLL;
644
645 host->broken_cd = of_property_read_bool(np, "broken-cd");
646
647 mmc->f_min = 400000;
648 mmc->f_max = 288000000;
649
650 ret = mmc_of_parse(mmc);
651 if (ret)
652 goto out_clk_disable;
653
654 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
655
656 mmc->max_segs = 52;
657 mmc->max_blk_size = 1 << 0xf;
658 mmc->max_blk_count = (ssp_is_old(ssp)) ? 0xff : 0xffffff;
659 mmc->max_req_size = (ssp_is_old(ssp)) ? 0xffff : 0xffffffff;
660 mmc->max_seg_size = dma_get_max_seg_size(ssp->dmach->device->dev);
661
662 platform_set_drvdata(pdev, mmc);
663
664 spin_lock_init(&host->lock);
665
666 ret = devm_request_irq(&pdev->dev, irq_err, mxs_mmc_irq_handler, 0,
667 dev_name(&pdev->dev), host);
668 if (ret)
669 goto out_free_dma;
670
671 ret = mmc_add_host(mmc);
672 if (ret)
673 goto out_free_dma;
674
675 dev_info(mmc_dev(host->mmc), "initialized\n");
676
677 return 0;
678
679 out_free_dma:
680 dma_release_channel(ssp->dmach);
681 out_clk_disable:
682 clk_disable_unprepare(ssp->clk);
683 out_mmc_free:
684 mmc_free_host(mmc);
685 return ret;
686 }
687
688 static int mxs_mmc_remove(struct platform_device *pdev)
689 {
690 struct mmc_host *mmc = platform_get_drvdata(pdev);
691 struct mxs_mmc_host *host = mmc_priv(mmc);
692 struct mxs_ssp *ssp = &host->ssp;
693
694 mmc_remove_host(mmc);
695
696 if (ssp->dmach)
697 dma_release_channel(ssp->dmach);
698
699 clk_disable_unprepare(ssp->clk);
700
701 mmc_free_host(mmc);
702
703 return 0;
704 }
705
706 #ifdef CONFIG_PM_SLEEP
707 static int mxs_mmc_suspend(struct device *dev)
708 {
709 struct mmc_host *mmc = dev_get_drvdata(dev);
710 struct mxs_mmc_host *host = mmc_priv(mmc);
711 struct mxs_ssp *ssp = &host->ssp;
712
713 clk_disable_unprepare(ssp->clk);
714 return 0;
715 }
716
717 static int mxs_mmc_resume(struct device *dev)
718 {
719 struct mmc_host *mmc = dev_get_drvdata(dev);
720 struct mxs_mmc_host *host = mmc_priv(mmc);
721 struct mxs_ssp *ssp = &host->ssp;
722
723 return clk_prepare_enable(ssp->clk);
724 }
725 #endif
726
727 static SIMPLE_DEV_PM_OPS(mxs_mmc_pm_ops, mxs_mmc_suspend, mxs_mmc_resume);
728
729 static struct platform_driver mxs_mmc_driver = {
730 .probe = mxs_mmc_probe,
731 .remove = mxs_mmc_remove,
732 .id_table = mxs_ssp_ids,
733 .driver = {
734 .name = DRIVER_NAME,
735 .pm = &mxs_mmc_pm_ops,
736 .of_match_table = mxs_mmc_dt_ids,
737 },
738 };
739
740 module_platform_driver(mxs_mmc_driver);
741
742 MODULE_DESCRIPTION("FREESCALE MXS MMC peripheral");
743 MODULE_AUTHOR("Freescale Semiconductor");
744 MODULE_LICENSE("GPL");
745 MODULE_ALIAS("platform:" DRIVER_NAME);
Linux with added FPC-III support