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i2c: aspeed: Fix initial values of master and slave state
[linux/fpc-iii.git] / drivers / mmc / host / mxs-mmc.c
blobadd1e70195ea6a2c7111f768c5865d15b17f085e
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 (cmd == mrq->sbc) {
157 /* Finished CMD23, now send actual command. */
158 mxs_mmc_start_cmd(host, mrq->cmd);
159 return;
160 } else if (data) {
161 dma_unmap_sg(mmc_dev(host->mmc), data->sg,
162 data->sg_len, ssp->dma_dir);
163 /*
164 * If there was an error on any block, we mark all
165 * data blocks as being in error.
166 */
167 if (!data->error)
168 data->bytes_xfered = data->blocks * data->blksz;
169 else
170 data->bytes_xfered = 0;
171
172 host->data = NULL;
173 if (data->stop && (data->error || !mrq->sbc)) {
174 mxs_mmc_start_cmd(host, mrq->stop);
175 return;
176 }
177 }
178
179 host->mrq = NULL;
180 mmc_request_done(host->mmc, mrq);
181 }
182
183 static void mxs_mmc_dma_irq_callback(void *param)
184 {
185 struct mxs_mmc_host *host = param;
186
187 mxs_mmc_request_done(host);
188 }
189
190 static irqreturn_t mxs_mmc_irq_handler(int irq, void *dev_id)
191 {
192 struct mxs_mmc_host *host = dev_id;
193 struct mmc_command *cmd = host->cmd;
194 struct mmc_data *data = host->data;
195 struct mxs_ssp *ssp = &host->ssp;
196 u32 stat;
197
198 spin_lock(&host->lock);
199
200 stat = readl(ssp->base + HW_SSP_CTRL1(ssp));
201 writel(stat & MXS_MMC_IRQ_BITS,
202 ssp->base + HW_SSP_CTRL1(ssp) + STMP_OFFSET_REG_CLR);
203
204 spin_unlock(&host->lock);
205
206 if ((stat & BM_SSP_CTRL1_SDIO_IRQ) && (stat & BM_SSP_CTRL1_SDIO_IRQ_EN))
207 mmc_signal_sdio_irq(host->mmc);
208
209 if (stat & BM_SSP_CTRL1_RESP_TIMEOUT_IRQ)
210 cmd->error = -ETIMEDOUT;
211 else if (stat & BM_SSP_CTRL1_RESP_ERR_IRQ)
212 cmd->error = -EIO;
213
214 if (data) {
215 if (stat & (BM_SSP_CTRL1_DATA_TIMEOUT_IRQ |
216 BM_SSP_CTRL1_RECV_TIMEOUT_IRQ))
217 data->error = -ETIMEDOUT;
218 else if (stat & BM_SSP_CTRL1_DATA_CRC_IRQ)
219 data->error = -EILSEQ;
220 else if (stat & (BM_SSP_CTRL1_FIFO_UNDERRUN_IRQ |
221 BM_SSP_CTRL1_FIFO_OVERRUN_IRQ))
222 data->error = -EIO;
223 }
224
225 return IRQ_HANDLED;
226 }
227
228 static struct dma_async_tx_descriptor *mxs_mmc_prep_dma(
229 struct mxs_mmc_host *host, unsigned long flags)
230 {
231 struct mxs_ssp *ssp = &host->ssp;
232 struct dma_async_tx_descriptor *desc;
233 struct mmc_data *data = host->data;
234 struct scatterlist * sgl;
235 unsigned int sg_len;
236
237 if (data) {
238 /* data */
239 dma_map_sg(mmc_dev(host->mmc), data->sg,
240 data->sg_len, ssp->dma_dir);
241 sgl = data->sg;
242 sg_len = data->sg_len;
243 } else {
244 /* pio */
245 sgl = (struct scatterlist *) ssp->ssp_pio_words;
246 sg_len = SSP_PIO_NUM;
247 }
248
249 desc = dmaengine_prep_slave_sg(ssp->dmach,
250 sgl, sg_len, ssp->slave_dirn, flags);
251 if (desc) {
252 desc->callback = mxs_mmc_dma_irq_callback;
253 desc->callback_param = host;
254 } else {
255 if (data)
256 dma_unmap_sg(mmc_dev(host->mmc), data->sg,
257 data->sg_len, ssp->dma_dir);
258 }
259
260 return desc;
261 }
262
263 static void mxs_mmc_bc(struct mxs_mmc_host *host)
264 {
265 struct mxs_ssp *ssp = &host->ssp;
266 struct mmc_command *cmd = host->cmd;
267 struct dma_async_tx_descriptor *desc;
268 u32 ctrl0, cmd0, cmd1;
269
270 ctrl0 = BM_SSP_CTRL0_ENABLE | BM_SSP_CTRL0_IGNORE_CRC;
271 cmd0 = BF_SSP(cmd->opcode, CMD0_CMD) | BM_SSP_CMD0_APPEND_8CYC;
272 cmd1 = cmd->arg;
273
274 if (host->sdio_irq_en) {
275 ctrl0 |= BM_SSP_CTRL0_SDIO_IRQ_CHECK;
276 cmd0 |= BM_SSP_CMD0_CONT_CLKING_EN | BM_SSP_CMD0_SLOW_CLKING_EN;
277 }
278
279 ssp->ssp_pio_words[0] = ctrl0;
280 ssp->ssp_pio_words[1] = cmd0;
281 ssp->ssp_pio_words[2] = cmd1;
282 ssp->dma_dir = DMA_NONE;
283 ssp->slave_dirn = DMA_TRANS_NONE;
284 desc = mxs_mmc_prep_dma(host, DMA_CTRL_ACK);
285 if (!desc)
286 goto out;
287
288 dmaengine_submit(desc);
289 dma_async_issue_pending(ssp->dmach);
290 return;
291
292 out:
293 dev_warn(mmc_dev(host->mmc),
294 "%s: failed to prep dma\n", __func__);
295 }
296
297 static void mxs_mmc_ac(struct mxs_mmc_host *host)
298 {
299 struct mxs_ssp *ssp = &host->ssp;
300 struct mmc_command *cmd = host->cmd;
301 struct dma_async_tx_descriptor *desc;
302 u32 ignore_crc, get_resp, long_resp;
303 u32 ctrl0, cmd0, cmd1;
304
305 ignore_crc = (mmc_resp_type(cmd) & MMC_RSP_CRC) ?
306 0 : BM_SSP_CTRL0_IGNORE_CRC;
307 get_resp = (mmc_resp_type(cmd) & MMC_RSP_PRESENT) ?
308 BM_SSP_CTRL0_GET_RESP : 0;
309 long_resp = (mmc_resp_type(cmd) & MMC_RSP_136) ?
310 BM_SSP_CTRL0_LONG_RESP : 0;
311
312 ctrl0 = BM_SSP_CTRL0_ENABLE | ignore_crc | get_resp | long_resp;
313 cmd0 = BF_SSP(cmd->opcode, CMD0_CMD);
314 cmd1 = cmd->arg;
315
316 if (cmd->opcode == MMC_STOP_TRANSMISSION)
317 cmd0 |= BM_SSP_CMD0_APPEND_8CYC;
318
319 if (host->sdio_irq_en) {
320 ctrl0 |= BM_SSP_CTRL0_SDIO_IRQ_CHECK;
321 cmd0 |= BM_SSP_CMD0_CONT_CLKING_EN | BM_SSP_CMD0_SLOW_CLKING_EN;
322 }
323
324 ssp->ssp_pio_words[0] = ctrl0;
325 ssp->ssp_pio_words[1] = cmd0;
326 ssp->ssp_pio_words[2] = cmd1;
327 ssp->dma_dir = DMA_NONE;
328 ssp->slave_dirn = DMA_TRANS_NONE;
329 desc = mxs_mmc_prep_dma(host, DMA_CTRL_ACK);
330 if (!desc)
331 goto out;
332
333 dmaengine_submit(desc);
334 dma_async_issue_pending(ssp->dmach);
335 return;
336
337 out:
338 dev_warn(mmc_dev(host->mmc),
339 "%s: failed to prep dma\n", __func__);
340 }
341
342 static unsigned short mxs_ns_to_ssp_ticks(unsigned clock_rate, unsigned ns)
343 {
344 const unsigned int ssp_timeout_mul = 4096;
345 /*
346 * Calculate ticks in ms since ns are large numbers
347 * and might overflow
348 */
349 const unsigned int clock_per_ms = clock_rate / 1000;
350 const unsigned int ms = ns / 1000;
351 const unsigned int ticks = ms * clock_per_ms;
352 const unsigned int ssp_ticks = ticks / ssp_timeout_mul;
353
354 WARN_ON(ssp_ticks == 0);
355 return ssp_ticks;
356 }
357
358 static void mxs_mmc_adtc(struct mxs_mmc_host *host)
359 {
360 struct mmc_command *cmd = host->cmd;
361 struct mmc_data *data = cmd->data;
362 struct dma_async_tx_descriptor *desc;
363 struct scatterlist *sgl = data->sg, *sg;
364 unsigned int sg_len = data->sg_len;
365 unsigned int i;
366
367 unsigned short dma_data_dir, timeout;
368 enum dma_transfer_direction slave_dirn;
369 unsigned int data_size = 0, log2_blksz;
370 unsigned int blocks = data->blocks;
371
372 struct mxs_ssp *ssp = &host->ssp;
373
374 u32 ignore_crc, get_resp, long_resp, read;
375 u32 ctrl0, cmd0, cmd1, val;
376
377 ignore_crc = (mmc_resp_type(cmd) & MMC_RSP_CRC) ?
378 0 : BM_SSP_CTRL0_IGNORE_CRC;
379 get_resp = (mmc_resp_type(cmd) & MMC_RSP_PRESENT) ?
380 BM_SSP_CTRL0_GET_RESP : 0;
381 long_resp = (mmc_resp_type(cmd) & MMC_RSP_136) ?
382 BM_SSP_CTRL0_LONG_RESP : 0;
383
384 if (data->flags & MMC_DATA_WRITE) {
385 dma_data_dir = DMA_TO_DEVICE;
386 slave_dirn = DMA_MEM_TO_DEV;
387 read = 0;
388 } else {
389 dma_data_dir = DMA_FROM_DEVICE;
390 slave_dirn = DMA_DEV_TO_MEM;
391 read = BM_SSP_CTRL0_READ;
392 }
393
394 ctrl0 = BF_SSP(host->bus_width, CTRL0_BUS_WIDTH) |
395 ignore_crc | get_resp | long_resp |
396 BM_SSP_CTRL0_DATA_XFER | read |
397 BM_SSP_CTRL0_WAIT_FOR_IRQ |
398 BM_SSP_CTRL0_ENABLE;
399
400 cmd0 = BF_SSP(cmd->opcode, CMD0_CMD);
401
402 /* get logarithm to base 2 of block size for setting register */
403 log2_blksz = ilog2(data->blksz);
404
405 /*
406 * take special care of the case that data size from data->sg
407 * is not equal to blocks x blksz
408 */
409 for_each_sg(sgl, sg, sg_len, i)
410 data_size += sg->length;
411
412 if (data_size != data->blocks * data->blksz)
413 blocks = 1;
414
415 /* xfer count, block size and count need to be set differently */
416 if (ssp_is_old(ssp)) {
417 ctrl0 |= BF_SSP(data_size, CTRL0_XFER_COUNT);
418 cmd0 |= BF_SSP(log2_blksz, CMD0_BLOCK_SIZE) |
419 BF_SSP(blocks - 1, CMD0_BLOCK_COUNT);
420 } else {
421 writel(data_size, ssp->base + HW_SSP_XFER_SIZE);
422 writel(BF_SSP(log2_blksz, BLOCK_SIZE_BLOCK_SIZE) |
423 BF_SSP(blocks - 1, BLOCK_SIZE_BLOCK_COUNT),
424 ssp->base + HW_SSP_BLOCK_SIZE);
425 }
426
427 if (cmd->opcode == SD_IO_RW_EXTENDED)
428 cmd0 |= BM_SSP_CMD0_APPEND_8CYC;
429
430 cmd1 = cmd->arg;
431
432 if (host->sdio_irq_en) {
433 ctrl0 |= BM_SSP_CTRL0_SDIO_IRQ_CHECK;
434 cmd0 |= BM_SSP_CMD0_CONT_CLKING_EN | BM_SSP_CMD0_SLOW_CLKING_EN;
435 }
436
437 /* set the timeout count */
438 timeout = mxs_ns_to_ssp_ticks(ssp->clk_rate, data->timeout_ns);
439 val = readl(ssp->base + HW_SSP_TIMING(ssp));
440 val &= ~(BM_SSP_TIMING_TIMEOUT);
441 val |= BF_SSP(timeout, TIMING_TIMEOUT);
442 writel(val, ssp->base + HW_SSP_TIMING(ssp));
443
444 /* pio */
445 ssp->ssp_pio_words[0] = ctrl0;
446 ssp->ssp_pio_words[1] = cmd0;
447 ssp->ssp_pio_words[2] = cmd1;
448 ssp->dma_dir = DMA_NONE;
449 ssp->slave_dirn = DMA_TRANS_NONE;
450 desc = mxs_mmc_prep_dma(host, 0);
451 if (!desc)
452 goto out;
453
454 /* append data sg */
455 WARN_ON(host->data != NULL);
456 host->data = data;
457 ssp->dma_dir = dma_data_dir;
458 ssp->slave_dirn = slave_dirn;
459 desc = mxs_mmc_prep_dma(host, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
460 if (!desc)
461 goto out;
462
463 dmaengine_submit(desc);
464 dma_async_issue_pending(ssp->dmach);
465 return;
466 out:
467 dev_warn(mmc_dev(host->mmc),
468 "%s: failed to prep dma\n", __func__);
469 }
470
471 static void mxs_mmc_start_cmd(struct mxs_mmc_host *host,
472 struct mmc_command *cmd)
473 {
474 host->cmd = cmd;
475
476 switch (mmc_cmd_type(cmd)) {
477 case MMC_CMD_BC:
478 mxs_mmc_bc(host);
479 break;
480 case MMC_CMD_BCR:
481 mxs_mmc_ac(host);
482 break;
483 case MMC_CMD_AC:
484 mxs_mmc_ac(host);
485 break;
486 case MMC_CMD_ADTC:
487 mxs_mmc_adtc(host);
488 break;
489 default:
490 dev_warn(mmc_dev(host->mmc),
491 "%s: unknown MMC command\n", __func__);
492 break;
493 }
494 }
495
496 static void mxs_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
497 {
498 struct mxs_mmc_host *host = mmc_priv(mmc);
499
500 WARN_ON(host->mrq != NULL);
501 host->mrq = mrq;
502
503 if (mrq->sbc)
504 mxs_mmc_start_cmd(host, mrq->sbc);
505 else
506 mxs_mmc_start_cmd(host, mrq->cmd);
507 }
508
509 static void mxs_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
510 {
511 struct mxs_mmc_host *host = mmc_priv(mmc);
512
513 if (ios->bus_width == MMC_BUS_WIDTH_8)
514 host->bus_width = 2;
515 else if (ios->bus_width == MMC_BUS_WIDTH_4)
516 host->bus_width = 1;
517 else
518 host->bus_width = 0;
519
520 if (ios->clock)
521 mxs_ssp_set_clk_rate(&host->ssp, ios->clock);
522 }
523
524 static void mxs_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
525 {
526 struct mxs_mmc_host *host = mmc_priv(mmc);
527 struct mxs_ssp *ssp = &host->ssp;
528 unsigned long flags;
529
530 spin_lock_irqsave(&host->lock, flags);
531
532 host->sdio_irq_en = enable;
533
534 if (enable) {
535 writel(BM_SSP_CTRL0_SDIO_IRQ_CHECK,
536 ssp->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_SET);
537 writel(BM_SSP_CTRL1_SDIO_IRQ_EN,
538 ssp->base + HW_SSP_CTRL1(ssp) + STMP_OFFSET_REG_SET);
539 } else {
540 writel(BM_SSP_CTRL0_SDIO_IRQ_CHECK,
541 ssp->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_CLR);
542 writel(BM_SSP_CTRL1_SDIO_IRQ_EN,
543 ssp->base + HW_SSP_CTRL1(ssp) + STMP_OFFSET_REG_CLR);
544 }
545
546 spin_unlock_irqrestore(&host->lock, flags);
547
548 if (enable && readl(ssp->base + HW_SSP_STATUS(ssp)) &
549 BM_SSP_STATUS_SDIO_IRQ)
550 mmc_signal_sdio_irq(host->mmc);
551
552 }
553
554 static const struct mmc_host_ops mxs_mmc_ops = {
555 .request = mxs_mmc_request,
556 .get_ro = mmc_gpio_get_ro,
557 .get_cd = mxs_mmc_get_cd,
558 .set_ios = mxs_mmc_set_ios,
559 .enable_sdio_irq = mxs_mmc_enable_sdio_irq,
560 };
561
562 static const struct platform_device_id mxs_ssp_ids[] = {
563 {
564 .name = "imx23-mmc",
565 .driver_data = IMX23_SSP,
566 }, {
567 .name = "imx28-mmc",
568 .driver_data = IMX28_SSP,
569 }, {
570 /* sentinel */
571 }
572 };
573 MODULE_DEVICE_TABLE(platform, mxs_ssp_ids);
574
575 static const struct of_device_id mxs_mmc_dt_ids[] = {
576 { .compatible = "fsl,imx23-mmc", .data = (void *) IMX23_SSP, },
577 { .compatible = "fsl,imx28-mmc", .data = (void *) IMX28_SSP, },
578 { /* sentinel */ }
579 };
580 MODULE_DEVICE_TABLE(of, mxs_mmc_dt_ids);
581
582 static int mxs_mmc_probe(struct platform_device *pdev)
583 {
584 const struct of_device_id *of_id =
585 of_match_device(mxs_mmc_dt_ids, &pdev->dev);
586 struct device_node *np = pdev->dev.of_node;
587 struct mxs_mmc_host *host;
588 struct mmc_host *mmc;
589 struct resource *iores;
590 int ret = 0, irq_err;
591 struct regulator *reg_vmmc;
592 struct mxs_ssp *ssp;
593
594 irq_err = platform_get_irq(pdev, 0);
595 if (irq_err < 0)
596 return irq_err;
597
598 mmc = mmc_alloc_host(sizeof(struct mxs_mmc_host), &pdev->dev);
599 if (!mmc)
600 return -ENOMEM;
601
602 host = mmc_priv(mmc);
603 ssp = &host->ssp;
604 ssp->dev = &pdev->dev;
605 iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
606 ssp->base = devm_ioremap_resource(&pdev->dev, iores);
607 if (IS_ERR(ssp->base)) {
608 ret = PTR_ERR(ssp->base);
609 goto out_mmc_free;
610 }
611
612 ssp->devid = (enum mxs_ssp_id) of_id->data;
613
614 host->mmc = mmc;
615 host->sdio_irq_en = 0;
616
617 reg_vmmc = devm_regulator_get(&pdev->dev, "vmmc");
618 if (!IS_ERR(reg_vmmc)) {
619 ret = regulator_enable(reg_vmmc);
620 if (ret) {
621 dev_err(&pdev->dev,
622 "Failed to enable vmmc regulator: %d\n", ret);
623 goto out_mmc_free;
624 }
625 }
626
627 ssp->clk = devm_clk_get(&pdev->dev, NULL);
628 if (IS_ERR(ssp->clk)) {
629 ret = PTR_ERR(ssp->clk);
630 goto out_mmc_free;
631 }
632 ret = clk_prepare_enable(ssp->clk);
633 if (ret)
634 goto out_mmc_free;
635
636 ret = mxs_mmc_reset(host);
637 if (ret) {
638 dev_err(&pdev->dev, "Failed to reset mmc: %d\n", ret);
639 goto out_clk_disable;
640 }
641
642 ssp->dmach = dma_request_slave_channel(&pdev->dev, "rx-tx");
643 if (!ssp->dmach) {
644 dev_err(mmc_dev(host->mmc),
645 "%s: failed to request dma\n", __func__);
646 ret = -ENODEV;
647 goto out_clk_disable;
648 }
649
650 /* set mmc core parameters */
651 mmc->ops = &mxs_mmc_ops;
652 mmc->caps = MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED |
653 MMC_CAP_SDIO_IRQ | MMC_CAP_NEEDS_POLL | MMC_CAP_CMD23;
654
655 host->broken_cd = of_property_read_bool(np, "broken-cd");
656
657 mmc->f_min = 400000;
658 mmc->f_max = 288000000;
659
660 ret = mmc_of_parse(mmc);
661 if (ret)
662 goto out_clk_disable;
663
664 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
665
666 mmc->max_segs = 52;
667 mmc->max_blk_size = 1 << 0xf;
668 mmc->max_blk_count = (ssp_is_old(ssp)) ? 0xff : 0xffffff;
669 mmc->max_req_size = (ssp_is_old(ssp)) ? 0xffff : 0xffffffff;
670 mmc->max_seg_size = dma_get_max_seg_size(ssp->dmach->device->dev);
671
672 platform_set_drvdata(pdev, mmc);
673
674 spin_lock_init(&host->lock);
675
676 ret = devm_request_irq(&pdev->dev, irq_err, mxs_mmc_irq_handler, 0,
677 dev_name(&pdev->dev), host);
678 if (ret)
679 goto out_free_dma;
680
681 ret = mmc_add_host(mmc);
682 if (ret)
683 goto out_free_dma;
684
685 dev_info(mmc_dev(host->mmc), "initialized\n");
686
687 return 0;
688
689 out_free_dma:
690 dma_release_channel(ssp->dmach);
691 out_clk_disable:
692 clk_disable_unprepare(ssp->clk);
693 out_mmc_free:
694 mmc_free_host(mmc);
695 return ret;
696 }
697
698 static int mxs_mmc_remove(struct platform_device *pdev)
699 {
700 struct mmc_host *mmc = platform_get_drvdata(pdev);
701 struct mxs_mmc_host *host = mmc_priv(mmc);
702 struct mxs_ssp *ssp = &host->ssp;
703
704 mmc_remove_host(mmc);
705
706 if (ssp->dmach)
707 dma_release_channel(ssp->dmach);
708
709 clk_disable_unprepare(ssp->clk);
710
711 mmc_free_host(mmc);
712
713 return 0;
714 }
715
716 #ifdef CONFIG_PM_SLEEP
717 static int mxs_mmc_suspend(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 clk_disable_unprepare(ssp->clk);
724 return 0;
725 }
726
727 static int mxs_mmc_resume(struct device *dev)
728 {
729 struct mmc_host *mmc = dev_get_drvdata(dev);
730 struct mxs_mmc_host *host = mmc_priv(mmc);
731 struct mxs_ssp *ssp = &host->ssp;
732
733 return clk_prepare_enable(ssp->clk);
734 }
735 #endif
736
737 static SIMPLE_DEV_PM_OPS(mxs_mmc_pm_ops, mxs_mmc_suspend, mxs_mmc_resume);
738
739 static struct platform_driver mxs_mmc_driver = {
740 .probe = mxs_mmc_probe,
741 .remove = mxs_mmc_remove,
742 .id_table = mxs_ssp_ids,
743 .driver = {
744 .name = DRIVER_NAME,
745 .pm = &mxs_mmc_pm_ops,
746 .of_match_table = mxs_mmc_dt_ids,
747 },
748 };
749
750 module_platform_driver(mxs_mmc_driver);
751
752 MODULE_DESCRIPTION("FREESCALE MXS MMC peripheral");
753 MODULE_AUTHOR("Freescale Semiconductor");
754 MODULE_LICENSE("GPL");
755 MODULE_ALIAS("platform:" DRIVER_NAME);
Linux with added FPC-III support