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ipv[4|6]: correct dropwatch false positive in local_deliver_finish
[linux/fpc-iii.git] / drivers / mmc / host / mxs-mmc.c
blob4efe3021b21766cf0c247cb1b8217e6d2c68267a
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/gpio.h>
42 #include <linux/regulator/consumer.h>
43 #include <linux/module.h>
44 #include <linux/pinctrl/consumer.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 int wp_gpio;
74 bool wp_inverted;
75 };
76
77 static int mxs_mmc_get_ro(struct mmc_host *mmc)
78 {
79 struct mxs_mmc_host *host = mmc_priv(mmc);
80 int ret;
81
82 if (!gpio_is_valid(host->wp_gpio))
83 return -EINVAL;
84
85 ret = gpio_get_value(host->wp_gpio);
86
87 if (host->wp_inverted)
88 ret = !ret;
89
90 return ret;
91 }
92
93 static int mxs_mmc_get_cd(struct mmc_host *mmc)
94 {
95 struct mxs_mmc_host *host = mmc_priv(mmc);
96 struct mxs_ssp *ssp = &host->ssp;
97
98 return !(readl(ssp->base + HW_SSP_STATUS(ssp)) &
99 BM_SSP_STATUS_CARD_DETECT);
100 }
101
102 static void mxs_mmc_reset(struct mxs_mmc_host *host)
103 {
104 struct mxs_ssp *ssp = &host->ssp;
105 u32 ctrl0, ctrl1;
106
107 stmp_reset_block(ssp->base);
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 }
133
134 static void mxs_mmc_start_cmd(struct mxs_mmc_host *host,
135 struct mmc_command *cmd);
136
137 static void mxs_mmc_request_done(struct mxs_mmc_host *host)
138 {
139 struct mmc_command *cmd = host->cmd;
140 struct mmc_data *data = host->data;
141 struct mmc_request *mrq = host->mrq;
142 struct mxs_ssp *ssp = &host->ssp;
143
144 if (mmc_resp_type(cmd) & MMC_RSP_PRESENT) {
145 if (mmc_resp_type(cmd) & MMC_RSP_136) {
146 cmd->resp[3] = readl(ssp->base + HW_SSP_SDRESP0(ssp));
147 cmd->resp[2] = readl(ssp->base + HW_SSP_SDRESP1(ssp));
148 cmd->resp[1] = readl(ssp->base + HW_SSP_SDRESP2(ssp));
149 cmd->resp[0] = readl(ssp->base + HW_SSP_SDRESP3(ssp));
150 } else {
151 cmd->resp[0] = readl(ssp->base + HW_SSP_SDRESP0(ssp));
152 }
153 }
154
155 if (data) {
156 dma_unmap_sg(mmc_dev(host->mmc), data->sg,
157 data->sg_len, ssp->dma_dir);
158 /*
159 * If there was an error on any block, we mark all
160 * data blocks as being in error.
161 */
162 if (!data->error)
163 data->bytes_xfered = data->blocks * data->blksz;
164 else
165 data->bytes_xfered = 0;
166
167 host->data = NULL;
168 if (mrq->stop) {
169 mxs_mmc_start_cmd(host, mrq->stop);
170 return;
171 }
172 }
173
174 host->mrq = NULL;
175 mmc_request_done(host->mmc, mrq);
176 }
177
178 static void mxs_mmc_dma_irq_callback(void *param)
179 {
180 struct mxs_mmc_host *host = param;
181
182 mxs_mmc_request_done(host);
183 }
184
185 static irqreturn_t mxs_mmc_irq_handler(int irq, void *dev_id)
186 {
187 struct mxs_mmc_host *host = dev_id;
188 struct mmc_command *cmd = host->cmd;
189 struct mmc_data *data = host->data;
190 struct mxs_ssp *ssp = &host->ssp;
191 u32 stat;
192
193 spin_lock(&host->lock);
194
195 stat = readl(ssp->base + HW_SSP_CTRL1(ssp));
196 writel(stat & MXS_MMC_IRQ_BITS,
197 ssp->base + HW_SSP_CTRL1(ssp) + STMP_OFFSET_REG_CLR);
198
199 spin_unlock(&host->lock);
200
201 if ((stat & BM_SSP_CTRL1_SDIO_IRQ) && (stat & BM_SSP_CTRL1_SDIO_IRQ_EN))
202 mmc_signal_sdio_irq(host->mmc);
203
204 if (stat & BM_SSP_CTRL1_RESP_TIMEOUT_IRQ)
205 cmd->error = -ETIMEDOUT;
206 else if (stat & BM_SSP_CTRL1_RESP_ERR_IRQ)
207 cmd->error = -EIO;
208
209 if (data) {
210 if (stat & (BM_SSP_CTRL1_DATA_TIMEOUT_IRQ |
211 BM_SSP_CTRL1_RECV_TIMEOUT_IRQ))
212 data->error = -ETIMEDOUT;
213 else if (stat & BM_SSP_CTRL1_DATA_CRC_IRQ)
214 data->error = -EILSEQ;
215 else if (stat & (BM_SSP_CTRL1_FIFO_UNDERRUN_IRQ |
216 BM_SSP_CTRL1_FIFO_OVERRUN_IRQ))
217 data->error = -EIO;
218 }
219
220 return IRQ_HANDLED;
221 }
222
223 static struct dma_async_tx_descriptor *mxs_mmc_prep_dma(
224 struct mxs_mmc_host *host, unsigned long flags)
225 {
226 struct mxs_ssp *ssp = &host->ssp;
227 struct dma_async_tx_descriptor *desc;
228 struct mmc_data *data = host->data;
229 struct scatterlist * sgl;
230 unsigned int sg_len;
231
232 if (data) {
233 /* data */
234 dma_map_sg(mmc_dev(host->mmc), data->sg,
235 data->sg_len, ssp->dma_dir);
236 sgl = data->sg;
237 sg_len = data->sg_len;
238 } else {
239 /* pio */
240 sgl = (struct scatterlist *) ssp->ssp_pio_words;
241 sg_len = SSP_PIO_NUM;
242 }
243
244 desc = dmaengine_prep_slave_sg(ssp->dmach,
245 sgl, sg_len, ssp->slave_dirn, flags);
246 if (desc) {
247 desc->callback = mxs_mmc_dma_irq_callback;
248 desc->callback_param = host;
249 } else {
250 if (data)
251 dma_unmap_sg(mmc_dev(host->mmc), data->sg,
252 data->sg_len, ssp->dma_dir);
253 }
254
255 return desc;
256 }
257
258 static void mxs_mmc_bc(struct mxs_mmc_host *host)
259 {
260 struct mxs_ssp *ssp = &host->ssp;
261 struct mmc_command *cmd = host->cmd;
262 struct dma_async_tx_descriptor *desc;
263 u32 ctrl0, cmd0, cmd1;
264
265 ctrl0 = BM_SSP_CTRL0_ENABLE | BM_SSP_CTRL0_IGNORE_CRC;
266 cmd0 = BF_SSP(cmd->opcode, CMD0_CMD) | BM_SSP_CMD0_APPEND_8CYC;
267 cmd1 = cmd->arg;
268
269 if (host->sdio_irq_en) {
270 ctrl0 |= BM_SSP_CTRL0_SDIO_IRQ_CHECK;
271 cmd0 |= BM_SSP_CMD0_CONT_CLKING_EN | BM_SSP_CMD0_SLOW_CLKING_EN;
272 }
273
274 ssp->ssp_pio_words[0] = ctrl0;
275 ssp->ssp_pio_words[1] = cmd0;
276 ssp->ssp_pio_words[2] = cmd1;
277 ssp->dma_dir = DMA_NONE;
278 ssp->slave_dirn = DMA_TRANS_NONE;
279 desc = mxs_mmc_prep_dma(host, DMA_CTRL_ACK);
280 if (!desc)
281 goto out;
282
283 dmaengine_submit(desc);
284 dma_async_issue_pending(ssp->dmach);
285 return;
286
287 out:
288 dev_warn(mmc_dev(host->mmc),
289 "%s: failed to prep dma\n", __func__);
290 }
291
292 static void mxs_mmc_ac(struct mxs_mmc_host *host)
293 {
294 struct mxs_ssp *ssp = &host->ssp;
295 struct mmc_command *cmd = host->cmd;
296 struct dma_async_tx_descriptor *desc;
297 u32 ignore_crc, get_resp, long_resp;
298 u32 ctrl0, cmd0, cmd1;
299
300 ignore_crc = (mmc_resp_type(cmd) & MMC_RSP_CRC) ?
301 0 : BM_SSP_CTRL0_IGNORE_CRC;
302 get_resp = (mmc_resp_type(cmd) & MMC_RSP_PRESENT) ?
303 BM_SSP_CTRL0_GET_RESP : 0;
304 long_resp = (mmc_resp_type(cmd) & MMC_RSP_136) ?
305 BM_SSP_CTRL0_LONG_RESP : 0;
306
307 ctrl0 = BM_SSP_CTRL0_ENABLE | ignore_crc | get_resp | long_resp;
308 cmd0 = BF_SSP(cmd->opcode, CMD0_CMD);
309 cmd1 = cmd->arg;
310
311 if (host->sdio_irq_en) {
312 ctrl0 |= BM_SSP_CTRL0_SDIO_IRQ_CHECK;
313 cmd0 |= BM_SSP_CMD0_CONT_CLKING_EN | BM_SSP_CMD0_SLOW_CLKING_EN;
314 }
315
316 ssp->ssp_pio_words[0] = ctrl0;
317 ssp->ssp_pio_words[1] = cmd0;
318 ssp->ssp_pio_words[2] = cmd1;
319 ssp->dma_dir = DMA_NONE;
320 ssp->slave_dirn = DMA_TRANS_NONE;
321 desc = mxs_mmc_prep_dma(host, DMA_CTRL_ACK);
322 if (!desc)
323 goto out;
324
325 dmaengine_submit(desc);
326 dma_async_issue_pending(ssp->dmach);
327 return;
328
329 out:
330 dev_warn(mmc_dev(host->mmc),
331 "%s: failed to prep dma\n", __func__);
332 }
333
334 static unsigned short mxs_ns_to_ssp_ticks(unsigned clock_rate, unsigned ns)
335 {
336 const unsigned int ssp_timeout_mul = 4096;
337 /*
338 * Calculate ticks in ms since ns are large numbers
339 * and might overflow
340 */
341 const unsigned int clock_per_ms = clock_rate / 1000;
342 const unsigned int ms = ns / 1000;
343 const unsigned int ticks = ms * clock_per_ms;
344 const unsigned int ssp_ticks = ticks / ssp_timeout_mul;
345
346 WARN_ON(ssp_ticks == 0);
347 return ssp_ticks;
348 }
349
350 static void mxs_mmc_adtc(struct mxs_mmc_host *host)
351 {
352 struct mmc_command *cmd = host->cmd;
353 struct mmc_data *data = cmd->data;
354 struct dma_async_tx_descriptor *desc;
355 struct scatterlist *sgl = data->sg, *sg;
356 unsigned int sg_len = data->sg_len;
357 unsigned int i;
358
359 unsigned short dma_data_dir, timeout;
360 enum dma_transfer_direction slave_dirn;
361 unsigned int data_size = 0, log2_blksz;
362 unsigned int blocks = data->blocks;
363
364 struct mxs_ssp *ssp = &host->ssp;
365
366 u32 ignore_crc, get_resp, long_resp, read;
367 u32 ctrl0, cmd0, cmd1, val;
368
369 ignore_crc = (mmc_resp_type(cmd) & MMC_RSP_CRC) ?
370 0 : BM_SSP_CTRL0_IGNORE_CRC;
371 get_resp = (mmc_resp_type(cmd) & MMC_RSP_PRESENT) ?
372 BM_SSP_CTRL0_GET_RESP : 0;
373 long_resp = (mmc_resp_type(cmd) & MMC_RSP_136) ?
374 BM_SSP_CTRL0_LONG_RESP : 0;
375
376 if (data->flags & MMC_DATA_WRITE) {
377 dma_data_dir = DMA_TO_DEVICE;
378 slave_dirn = DMA_MEM_TO_DEV;
379 read = 0;
380 } else {
381 dma_data_dir = DMA_FROM_DEVICE;
382 slave_dirn = DMA_DEV_TO_MEM;
383 read = BM_SSP_CTRL0_READ;
384 }
385
386 ctrl0 = BF_SSP(host->bus_width, CTRL0_BUS_WIDTH) |
387 ignore_crc | get_resp | long_resp |
388 BM_SSP_CTRL0_DATA_XFER | read |
389 BM_SSP_CTRL0_WAIT_FOR_IRQ |
390 BM_SSP_CTRL0_ENABLE;
391
392 cmd0 = BF_SSP(cmd->opcode, CMD0_CMD);
393
394 /* get logarithm to base 2 of block size for setting register */
395 log2_blksz = ilog2(data->blksz);
396
397 /*
398 * take special care of the case that data size from data->sg
399 * is not equal to blocks x blksz
400 */
401 for_each_sg(sgl, sg, sg_len, i)
402 data_size += sg->length;
403
404 if (data_size != data->blocks * data->blksz)
405 blocks = 1;
406
407 /* xfer count, block size and count need to be set differently */
408 if (ssp_is_old(ssp)) {
409 ctrl0 |= BF_SSP(data_size, CTRL0_XFER_COUNT);
410 cmd0 |= BF_SSP(log2_blksz, CMD0_BLOCK_SIZE) |
411 BF_SSP(blocks - 1, CMD0_BLOCK_COUNT);
412 } else {
413 writel(data_size, ssp->base + HW_SSP_XFER_SIZE);
414 writel(BF_SSP(log2_blksz, BLOCK_SIZE_BLOCK_SIZE) |
415 BF_SSP(blocks - 1, BLOCK_SIZE_BLOCK_COUNT),
416 ssp->base + HW_SSP_BLOCK_SIZE);
417 }
418
419 if ((cmd->opcode == MMC_STOP_TRANSMISSION) ||
420 (cmd->opcode == SD_IO_RW_EXTENDED))
421 cmd0 |= BM_SSP_CMD0_APPEND_8CYC;
422
423 cmd1 = cmd->arg;
424
425 if (host->sdio_irq_en) {
426 ctrl0 |= BM_SSP_CTRL0_SDIO_IRQ_CHECK;
427 cmd0 |= BM_SSP_CMD0_CONT_CLKING_EN | BM_SSP_CMD0_SLOW_CLKING_EN;
428 }
429
430 /* set the timeout count */
431 timeout = mxs_ns_to_ssp_ticks(ssp->clk_rate, data->timeout_ns);
432 val = readl(ssp->base + HW_SSP_TIMING(ssp));
433 val &= ~(BM_SSP_TIMING_TIMEOUT);
434 val |= BF_SSP(timeout, TIMING_TIMEOUT);
435 writel(val, ssp->base + HW_SSP_TIMING(ssp));
436
437 /* pio */
438 ssp->ssp_pio_words[0] = ctrl0;
439 ssp->ssp_pio_words[1] = cmd0;
440 ssp->ssp_pio_words[2] = cmd1;
441 ssp->dma_dir = DMA_NONE;
442 ssp->slave_dirn = DMA_TRANS_NONE;
443 desc = mxs_mmc_prep_dma(host, 0);
444 if (!desc)
445 goto out;
446
447 /* append data sg */
448 WARN_ON(host->data != NULL);
449 host->data = data;
450 ssp->dma_dir = dma_data_dir;
451 ssp->slave_dirn = slave_dirn;
452 desc = mxs_mmc_prep_dma(host, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
453 if (!desc)
454 goto out;
455
456 dmaengine_submit(desc);
457 dma_async_issue_pending(ssp->dmach);
458 return;
459 out:
460 dev_warn(mmc_dev(host->mmc),
461 "%s: failed to prep dma\n", __func__);
462 }
463
464 static void mxs_mmc_start_cmd(struct mxs_mmc_host *host,
465 struct mmc_command *cmd)
466 {
467 host->cmd = cmd;
468
469 switch (mmc_cmd_type(cmd)) {
470 case MMC_CMD_BC:
471 mxs_mmc_bc(host);
472 break;
473 case MMC_CMD_BCR:
474 mxs_mmc_ac(host);
475 break;
476 case MMC_CMD_AC:
477 mxs_mmc_ac(host);
478 break;
479 case MMC_CMD_ADTC:
480 mxs_mmc_adtc(host);
481 break;
482 default:
483 dev_warn(mmc_dev(host->mmc),
484 "%s: unknown MMC command\n", __func__);
485 break;
486 }
487 }
488
489 static void mxs_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
490 {
491 struct mxs_mmc_host *host = mmc_priv(mmc);
492
493 WARN_ON(host->mrq != NULL);
494 host->mrq = mrq;
495 mxs_mmc_start_cmd(host, mrq->cmd);
496 }
497
498 static void mxs_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
499 {
500 struct mxs_mmc_host *host = mmc_priv(mmc);
501
502 if (ios->bus_width == MMC_BUS_WIDTH_8)
503 host->bus_width = 2;
504 else if (ios->bus_width == MMC_BUS_WIDTH_4)
505 host->bus_width = 1;
506 else
507 host->bus_width = 0;
508
509 if (ios->clock)
510 mxs_ssp_set_clk_rate(&host->ssp, ios->clock);
511 }
512
513 static void mxs_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
514 {
515 struct mxs_mmc_host *host = mmc_priv(mmc);
516 struct mxs_ssp *ssp = &host->ssp;
517 unsigned long flags;
518
519 spin_lock_irqsave(&host->lock, flags);
520
521 host->sdio_irq_en = enable;
522
523 if (enable) {
524 writel(BM_SSP_CTRL0_SDIO_IRQ_CHECK,
525 ssp->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_SET);
526 writel(BM_SSP_CTRL1_SDIO_IRQ_EN,
527 ssp->base + HW_SSP_CTRL1(ssp) + STMP_OFFSET_REG_SET);
528 } else {
529 writel(BM_SSP_CTRL0_SDIO_IRQ_CHECK,
530 ssp->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_CLR);
531 writel(BM_SSP_CTRL1_SDIO_IRQ_EN,
532 ssp->base + HW_SSP_CTRL1(ssp) + STMP_OFFSET_REG_CLR);
533 }
534
535 spin_unlock_irqrestore(&host->lock, flags);
536
537 if (enable && readl(ssp->base + HW_SSP_STATUS(ssp)) &
538 BM_SSP_STATUS_SDIO_IRQ)
539 mmc_signal_sdio_irq(host->mmc);
540
541 }
542
543 static const struct mmc_host_ops mxs_mmc_ops = {
544 .request = mxs_mmc_request,
545 .get_ro = mxs_mmc_get_ro,
546 .get_cd = mxs_mmc_get_cd,
547 .set_ios = mxs_mmc_set_ios,
548 .enable_sdio_irq = mxs_mmc_enable_sdio_irq,
549 };
550
551 static bool mxs_mmc_dma_filter(struct dma_chan *chan, void *param)
552 {
553 struct mxs_mmc_host *host = param;
554 struct mxs_ssp *ssp = &host->ssp;
555
556 if (!mxs_dma_is_apbh(chan))
557 return false;
558
559 if (chan->chan_id != ssp->dma_channel)
560 return false;
561
562 chan->private = &ssp->dma_data;
563
564 return true;
565 }
566
567 static struct platform_device_id mxs_ssp_ids[] = {
568 {
569 .name = "imx23-mmc",
570 .driver_data = IMX23_SSP,
571 }, {
572 .name = "imx28-mmc",
573 .driver_data = IMX28_SSP,
574 }, {
575 /* sentinel */
576 }
577 };
578 MODULE_DEVICE_TABLE(platform, mxs_ssp_ids);
579
580 static const struct of_device_id mxs_mmc_dt_ids[] = {
581 { .compatible = "fsl,imx23-mmc", .data = (void *) IMX23_SSP, },
582 { .compatible = "fsl,imx28-mmc", .data = (void *) IMX28_SSP, },
583 { /* sentinel */ }
584 };
585 MODULE_DEVICE_TABLE(of, mxs_mmc_dt_ids);
586
587 static int mxs_mmc_probe(struct platform_device *pdev)
588 {
589 const struct of_device_id *of_id =
590 of_match_device(mxs_mmc_dt_ids, &pdev->dev);
591 struct device_node *np = pdev->dev.of_node;
592 struct mxs_mmc_host *host;
593 struct mmc_host *mmc;
594 struct resource *iores, *dmares;
595 struct pinctrl *pinctrl;
596 int ret = 0, irq_err, irq_dma;
597 dma_cap_mask_t mask;
598 struct regulator *reg_vmmc;
599 enum of_gpio_flags flags;
600 struct mxs_ssp *ssp;
601 u32 bus_width = 0;
602
603 iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
604 dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
605 irq_err = platform_get_irq(pdev, 0);
606 irq_dma = platform_get_irq(pdev, 1);
607 if (!iores || irq_err < 0 || irq_dma < 0)
608 return -EINVAL;
609
610 mmc = mmc_alloc_host(sizeof(struct mxs_mmc_host), &pdev->dev);
611 if (!mmc)
612 return -ENOMEM;
613
614 host = mmc_priv(mmc);
615 ssp = &host->ssp;
616 ssp->dev = &pdev->dev;
617 ssp->base = devm_ioremap_resource(&pdev->dev, iores);
618 if (IS_ERR(ssp->base)) {
619 ret = PTR_ERR(ssp->base);
620 goto out_mmc_free;
621 }
622
623 if (np) {
624 ssp->devid = (enum mxs_ssp_id) of_id->data;
625 /*
626 * TODO: This is a temporary solution and should be changed
627 * to use generic DMA binding later when the helpers get in.
628 */
629 ret = of_property_read_u32(np, "fsl,ssp-dma-channel",
630 &ssp->dma_channel);
631 if (ret) {
632 dev_err(mmc_dev(host->mmc),
633 "failed to get dma channel\n");
634 goto out_mmc_free;
635 }
636 } else {
637 ssp->devid = pdev->id_entry->driver_data;
638 ssp->dma_channel = dmares->start;
639 }
640
641 host->mmc = mmc;
642 host->sdio_irq_en = 0;
643
644 reg_vmmc = devm_regulator_get(&pdev->dev, "vmmc");
645 if (!IS_ERR(reg_vmmc)) {
646 ret = regulator_enable(reg_vmmc);
647 if (ret) {
648 dev_err(&pdev->dev,
649 "Failed to enable vmmc regulator: %d\n", ret);
650 goto out_mmc_free;
651 }
652 }
653
654 pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
655 if (IS_ERR(pinctrl)) {
656 ret = PTR_ERR(pinctrl);
657 goto out_mmc_free;
658 }
659
660 ssp->clk = clk_get(&pdev->dev, NULL);
661 if (IS_ERR(ssp->clk)) {
662 ret = PTR_ERR(ssp->clk);
663 goto out_mmc_free;
664 }
665 clk_prepare_enable(ssp->clk);
666
667 mxs_mmc_reset(host);
668
669 dma_cap_zero(mask);
670 dma_cap_set(DMA_SLAVE, mask);
671 ssp->dma_data.chan_irq = irq_dma;
672 ssp->dmach = dma_request_channel(mask, mxs_mmc_dma_filter, host);
673 if (!ssp->dmach) {
674 dev_err(mmc_dev(host->mmc),
675 "%s: failed to request dma\n", __func__);
676 goto out_clk_put;
677 }
678
679 /* set mmc core parameters */
680 mmc->ops = &mxs_mmc_ops;
681 mmc->caps = MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED |
682 MMC_CAP_SDIO_IRQ | MMC_CAP_NEEDS_POLL;
683
684 of_property_read_u32(np, "bus-width", &bus_width);
685 if (bus_width == 4)
686 mmc->caps |= MMC_CAP_4_BIT_DATA;
687 else if (bus_width == 8)
688 mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA;
689 host->wp_gpio = of_get_named_gpio_flags(np, "wp-gpios", 0, &flags);
690
691 if (flags & OF_GPIO_ACTIVE_LOW)
692 host->wp_inverted = 1;
693
694 mmc->f_min = 400000;
695 mmc->f_max = 288000000;
696 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
697
698 mmc->max_segs = 52;
699 mmc->max_blk_size = 1 << 0xf;
700 mmc->max_blk_count = (ssp_is_old(ssp)) ? 0xff : 0xffffff;
701 mmc->max_req_size = (ssp_is_old(ssp)) ? 0xffff : 0xffffffff;
702 mmc->max_seg_size = dma_get_max_seg_size(ssp->dmach->device->dev);
703
704 platform_set_drvdata(pdev, mmc);
705
706 ret = devm_request_irq(&pdev->dev, irq_err, mxs_mmc_irq_handler, 0,
707 DRIVER_NAME, host);
708 if (ret)
709 goto out_free_dma;
710
711 spin_lock_init(&host->lock);
712
713 ret = mmc_add_host(mmc);
714 if (ret)
715 goto out_free_dma;
716
717 dev_info(mmc_dev(host->mmc), "initialized\n");
718
719 return 0;
720
721 out_free_dma:
722 if (ssp->dmach)
723 dma_release_channel(ssp->dmach);
724 out_clk_put:
725 clk_disable_unprepare(ssp->clk);
726 clk_put(ssp->clk);
727 out_mmc_free:
728 mmc_free_host(mmc);
729 return ret;
730 }
731
732 static int mxs_mmc_remove(struct platform_device *pdev)
733 {
734 struct mmc_host *mmc = platform_get_drvdata(pdev);
735 struct mxs_mmc_host *host = mmc_priv(mmc);
736 struct mxs_ssp *ssp = &host->ssp;
737
738 mmc_remove_host(mmc);
739
740 platform_set_drvdata(pdev, NULL);
741
742 if (ssp->dmach)
743 dma_release_channel(ssp->dmach);
744
745 clk_disable_unprepare(ssp->clk);
746 clk_put(ssp->clk);
747
748 mmc_free_host(mmc);
749
750 return 0;
751 }
752
753 #ifdef CONFIG_PM
754 static int mxs_mmc_suspend(struct device *dev)
755 {
756 struct mmc_host *mmc = dev_get_drvdata(dev);
757 struct mxs_mmc_host *host = mmc_priv(mmc);
758 struct mxs_ssp *ssp = &host->ssp;
759 int ret = 0;
760
761 ret = mmc_suspend_host(mmc);
762
763 clk_disable_unprepare(ssp->clk);
764
765 return ret;
766 }
767
768 static int mxs_mmc_resume(struct device *dev)
769 {
770 struct mmc_host *mmc = dev_get_drvdata(dev);
771 struct mxs_mmc_host *host = mmc_priv(mmc);
772 struct mxs_ssp *ssp = &host->ssp;
773 int ret = 0;
774
775 clk_prepare_enable(ssp->clk);
776
777 ret = mmc_resume_host(mmc);
778
779 return ret;
780 }
781
782 static const struct dev_pm_ops mxs_mmc_pm_ops = {
783 .suspend = mxs_mmc_suspend,
784 .resume = mxs_mmc_resume,
785 };
786 #endif
787
788 static struct platform_driver mxs_mmc_driver = {
789 .probe = mxs_mmc_probe,
790 .remove = mxs_mmc_remove,
791 .id_table = mxs_ssp_ids,
792 .driver = {
793 .name = DRIVER_NAME,
794 .owner = THIS_MODULE,
795 #ifdef CONFIG_PM
796 .pm = &mxs_mmc_pm_ops,
797 #endif
798 .of_match_table = mxs_mmc_dt_ids,
799 },
800 };
801
802 module_platform_driver(mxs_mmc_driver);
803
804 MODULE_DESCRIPTION("FREESCALE MXS MMC peripheral");
805 MODULE_AUTHOR("Freescale Semiconductor");
806 MODULE_LICENSE("GPL");
807 MODULE_ALIAS("platform:" DRIVER_NAME);
Linux with added FPC-III support