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PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / mmc / host / mxcmmc.c
blobf7199c83f5cf8e85c49ed54b575502d0187fc8c3
1 /*
2 * linux/drivers/mmc/host/mxcmmc.c - Freescale i.MX MMCI driver
3 *
4 * This is a driver for the SDHC controller found in Freescale MX2/MX3
5 * SoCs. It is basically the same hardware as found on MX1 (imxmmc.c).
6 * Unlike the hardware found on MX1, this hardware just works and does
7 * not need all the quirks found in imxmmc.c, hence the separate driver.
8 *
9 * Copyright (C) 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
10 * Copyright (C) 2006 Pavel Pisa, PiKRON <ppisa@pikron.com>
11 *
12 * derived from pxamci.c by Russell King
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2 as
16 * published by the Free Software Foundation.
17 *
18 */
19
20 #include <linux/module.h>
21 #include <linux/init.h>
22 #include <linux/ioport.h>
23 #include <linux/platform_device.h>
24 #include <linux/interrupt.h>
25 #include <linux/irq.h>
26 #include <linux/blkdev.h>
27 #include <linux/dma-mapping.h>
28 #include <linux/mmc/host.h>
29 #include <linux/mmc/card.h>
30 #include <linux/delay.h>
31 #include <linux/clk.h>
32 #include <linux/io.h>
33 #include <linux/gpio.h>
34 #include <linux/regulator/consumer.h>
35 #include <linux/dmaengine.h>
36 #include <linux/types.h>
37 #include <linux/of.h>
38 #include <linux/of_device.h>
39 #include <linux/of_dma.h>
40 #include <linux/of_gpio.h>
41 #include <linux/mmc/slot-gpio.h>
42
43 #include <asm/dma.h>
44 #include <asm/irq.h>
45 #include <linux/platform_data/mmc-mxcmmc.h>
46
47 #include <linux/platform_data/dma-imx.h>
48
49 #define DRIVER_NAME "mxc-mmc"
50 #define MXCMCI_TIMEOUT_MS 10000
51
52 #define MMC_REG_STR_STP_CLK 0x00
53 #define MMC_REG_STATUS 0x04
54 #define MMC_REG_CLK_RATE 0x08
55 #define MMC_REG_CMD_DAT_CONT 0x0C
56 #define MMC_REG_RES_TO 0x10
57 #define MMC_REG_READ_TO 0x14
58 #define MMC_REG_BLK_LEN 0x18
59 #define MMC_REG_NOB 0x1C
60 #define MMC_REG_REV_NO 0x20
61 #define MMC_REG_INT_CNTR 0x24
62 #define MMC_REG_CMD 0x28
63 #define MMC_REG_ARG 0x2C
64 #define MMC_REG_RES_FIFO 0x34
65 #define MMC_REG_BUFFER_ACCESS 0x38
66
67 #define STR_STP_CLK_RESET (1 << 3)
68 #define STR_STP_CLK_START_CLK (1 << 1)
69 #define STR_STP_CLK_STOP_CLK (1 << 0)
70
71 #define STATUS_CARD_INSERTION (1 << 31)
72 #define STATUS_CARD_REMOVAL (1 << 30)
73 #define STATUS_YBUF_EMPTY (1 << 29)
74 #define STATUS_XBUF_EMPTY (1 << 28)
75 #define STATUS_YBUF_FULL (1 << 27)
76 #define STATUS_XBUF_FULL (1 << 26)
77 #define STATUS_BUF_UND_RUN (1 << 25)
78 #define STATUS_BUF_OVFL (1 << 24)
79 #define STATUS_SDIO_INT_ACTIVE (1 << 14)
80 #define STATUS_END_CMD_RESP (1 << 13)
81 #define STATUS_WRITE_OP_DONE (1 << 12)
82 #define STATUS_DATA_TRANS_DONE (1 << 11)
83 #define STATUS_READ_OP_DONE (1 << 11)
84 #define STATUS_WR_CRC_ERROR_CODE_MASK (3 << 10)
85 #define STATUS_CARD_BUS_CLK_RUN (1 << 8)
86 #define STATUS_BUF_READ_RDY (1 << 7)
87 #define STATUS_BUF_WRITE_RDY (1 << 6)
88 #define STATUS_RESP_CRC_ERR (1 << 5)
89 #define STATUS_CRC_READ_ERR (1 << 3)
90 #define STATUS_CRC_WRITE_ERR (1 << 2)
91 #define STATUS_TIME_OUT_RESP (1 << 1)
92 #define STATUS_TIME_OUT_READ (1 << 0)
93 #define STATUS_ERR_MASK 0x2f
94
95 #define CMD_DAT_CONT_CMD_RESP_LONG_OFF (1 << 12)
96 #define CMD_DAT_CONT_STOP_READWAIT (1 << 11)
97 #define CMD_DAT_CONT_START_READWAIT (1 << 10)
98 #define CMD_DAT_CONT_BUS_WIDTH_4 (2 << 8)
99 #define CMD_DAT_CONT_INIT (1 << 7)
100 #define CMD_DAT_CONT_WRITE (1 << 4)
101 #define CMD_DAT_CONT_DATA_ENABLE (1 << 3)
102 #define CMD_DAT_CONT_RESPONSE_48BIT_CRC (1 << 0)
103 #define CMD_DAT_CONT_RESPONSE_136BIT (2 << 0)
104 #define CMD_DAT_CONT_RESPONSE_48BIT (3 << 0)
105
106 #define INT_SDIO_INT_WKP_EN (1 << 18)
107 #define INT_CARD_INSERTION_WKP_EN (1 << 17)
108 #define INT_CARD_REMOVAL_WKP_EN (1 << 16)
109 #define INT_CARD_INSERTION_EN (1 << 15)
110 #define INT_CARD_REMOVAL_EN (1 << 14)
111 #define INT_SDIO_IRQ_EN (1 << 13)
112 #define INT_DAT0_EN (1 << 12)
113 #define INT_BUF_READ_EN (1 << 4)
114 #define INT_BUF_WRITE_EN (1 << 3)
115 #define INT_END_CMD_RES_EN (1 << 2)
116 #define INT_WRITE_OP_DONE_EN (1 << 1)
117 #define INT_READ_OP_EN (1 << 0)
118
119 enum mxcmci_type {
120 IMX21_MMC,
121 IMX31_MMC,
122 MPC512X_MMC,
123 };
124
125 struct mxcmci_host {
126 struct mmc_host *mmc;
127 struct resource *res;
128 void __iomem *base;
129 int irq;
130 int detect_irq;
131 struct dma_chan *dma;
132 struct dma_async_tx_descriptor *desc;
133 int do_dma;
134 int default_irq_mask;
135 int use_sdio;
136 unsigned int power_mode;
137 struct imxmmc_platform_data *pdata;
138
139 struct mmc_request *req;
140 struct mmc_command *cmd;
141 struct mmc_data *data;
142
143 unsigned int datasize;
144 unsigned int dma_dir;
145
146 u16 rev_no;
147 unsigned int cmdat;
148
149 struct clk *clk_ipg;
150 struct clk *clk_per;
151
152 int clock;
153
154 struct work_struct datawork;
155 spinlock_t lock;
156
157 struct regulator *vcc;
158
159 int burstlen;
160 int dmareq;
161 struct dma_slave_config dma_slave_config;
162 struct imx_dma_data dma_data;
163
164 struct timer_list watchdog;
165 enum mxcmci_type devtype;
166 };
167
168 static const struct platform_device_id mxcmci_devtype[] = {
169 {
170 .name = "imx21-mmc",
171 .driver_data = IMX21_MMC,
172 }, {
173 .name = "imx31-mmc",
174 .driver_data = IMX31_MMC,
175 }, {
176 .name = "mpc512x-sdhc",
177 .driver_data = MPC512X_MMC,
178 }, {
179 /* sentinel */
180 }
181 };
182 MODULE_DEVICE_TABLE(platform, mxcmci_devtype);
183
184 static const struct of_device_id mxcmci_of_match[] = {
185 {
186 .compatible = "fsl,imx21-mmc",
187 .data = &mxcmci_devtype[IMX21_MMC],
188 }, {
189 .compatible = "fsl,imx31-mmc",
190 .data = &mxcmci_devtype[IMX31_MMC],
191 }, {
192 .compatible = "fsl,mpc5121-sdhc",
193 .data = &mxcmci_devtype[MPC512X_MMC],
194 }, {
195 /* sentinel */
196 }
197 };
198 MODULE_DEVICE_TABLE(of, mxcmci_of_match);
199
200 static inline int is_imx31_mmc(struct mxcmci_host *host)
201 {
202 return host->devtype == IMX31_MMC;
203 }
204
205 static inline int is_mpc512x_mmc(struct mxcmci_host *host)
206 {
207 return host->devtype == MPC512X_MMC;
208 }
209
210 static inline u32 mxcmci_readl(struct mxcmci_host *host, int reg)
211 {
212 if (IS_ENABLED(CONFIG_PPC_MPC512x))
213 return ioread32be(host->base + reg);
214 else
215 return readl(host->base + reg);
216 }
217
218 static inline void mxcmci_writel(struct mxcmci_host *host, u32 val, int reg)
219 {
220 if (IS_ENABLED(CONFIG_PPC_MPC512x))
221 iowrite32be(val, host->base + reg);
222 else
223 writel(val, host->base + reg);
224 }
225
226 static inline u16 mxcmci_readw(struct mxcmci_host *host, int reg)
227 {
228 if (IS_ENABLED(CONFIG_PPC_MPC512x))
229 return ioread32be(host->base + reg);
230 else
231 return readw(host->base + reg);
232 }
233
234 static inline void mxcmci_writew(struct mxcmci_host *host, u16 val, int reg)
235 {
236 if (IS_ENABLED(CONFIG_PPC_MPC512x))
237 iowrite32be(val, host->base + reg);
238 else
239 writew(val, host->base + reg);
240 }
241
242 static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios);
243
244 static inline void mxcmci_init_ocr(struct mxcmci_host *host)
245 {
246 host->vcc = regulator_get(mmc_dev(host->mmc), "vmmc");
247
248 if (IS_ERR(host->vcc)) {
249 host->vcc = NULL;
250 } else {
251 host->mmc->ocr_avail = mmc_regulator_get_ocrmask(host->vcc);
252 if (host->pdata && host->pdata->ocr_avail)
253 dev_warn(mmc_dev(host->mmc),
254 "pdata->ocr_avail will not be used\n");
255 }
256
257 if (host->vcc == NULL) {
258 /* fall-back to platform data */
259 if (host->pdata && host->pdata->ocr_avail)
260 host->mmc->ocr_avail = host->pdata->ocr_avail;
261 else
262 host->mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
263 }
264 }
265
266 static inline void mxcmci_set_power(struct mxcmci_host *host,
267 unsigned char power_mode,
268 unsigned int vdd)
269 {
270 if (host->vcc) {
271 if (power_mode == MMC_POWER_UP)
272 mmc_regulator_set_ocr(host->mmc, host->vcc, vdd);
273 else if (power_mode == MMC_POWER_OFF)
274 mmc_regulator_set_ocr(host->mmc, host->vcc, 0);
275 }
276
277 if (host->pdata && host->pdata->setpower)
278 host->pdata->setpower(mmc_dev(host->mmc), vdd);
279 }
280
281 static inline int mxcmci_use_dma(struct mxcmci_host *host)
282 {
283 return host->do_dma;
284 }
285
286 static void mxcmci_softreset(struct mxcmci_host *host)
287 {
288 int i;
289
290 dev_dbg(mmc_dev(host->mmc), "mxcmci_softreset\n");
291
292 /* reset sequence */
293 mxcmci_writew(host, STR_STP_CLK_RESET, MMC_REG_STR_STP_CLK);
294 mxcmci_writew(host, STR_STP_CLK_RESET | STR_STP_CLK_START_CLK,
295 MMC_REG_STR_STP_CLK);
296
297 for (i = 0; i < 8; i++)
298 mxcmci_writew(host, STR_STP_CLK_START_CLK, MMC_REG_STR_STP_CLK);
299
300 mxcmci_writew(host, 0xff, MMC_REG_RES_TO);
301 }
302 static int mxcmci_setup_dma(struct mmc_host *mmc);
303
304 #if IS_ENABLED(CONFIG_PPC_MPC512x)
305 static inline void buffer_swap32(u32 *buf, int len)
306 {
307 int i;
308
309 for (i = 0; i < ((len + 3) / 4); i++) {
310 st_le32(buf, *buf);
311 buf++;
312 }
313 }
314
315 static void mxcmci_swap_buffers(struct mmc_data *data)
316 {
317 struct scatterlist *sg;
318 int i;
319
320 for_each_sg(data->sg, sg, data->sg_len, i)
321 buffer_swap32(sg_virt(sg), sg->length);
322 }
323 #else
324 static inline void mxcmci_swap_buffers(struct mmc_data *data) {}
325 #endif
326
327 static int mxcmci_setup_data(struct mxcmci_host *host, struct mmc_data *data)
328 {
329 unsigned int nob = data->blocks;
330 unsigned int blksz = data->blksz;
331 unsigned int datasize = nob * blksz;
332 struct scatterlist *sg;
333 enum dma_transfer_direction slave_dirn;
334 int i, nents;
335
336 if (data->flags & MMC_DATA_STREAM)
337 nob = 0xffff;
338
339 host->data = data;
340 data->bytes_xfered = 0;
341
342 mxcmci_writew(host, nob, MMC_REG_NOB);
343 mxcmci_writew(host, blksz, MMC_REG_BLK_LEN);
344 host->datasize = datasize;
345
346 if (!mxcmci_use_dma(host))
347 return 0;
348
349 for_each_sg(data->sg, sg, data->sg_len, i) {
350 if (sg->offset & 3 || sg->length & 3 || sg->length < 512) {
351 host->do_dma = 0;
352 return 0;
353 }
354 }
355
356 if (data->flags & MMC_DATA_READ) {
357 host->dma_dir = DMA_FROM_DEVICE;
358 slave_dirn = DMA_DEV_TO_MEM;
359 } else {
360 host->dma_dir = DMA_TO_DEVICE;
361 slave_dirn = DMA_MEM_TO_DEV;
362
363 mxcmci_swap_buffers(data);
364 }
365
366 nents = dma_map_sg(host->dma->device->dev, data->sg,
367 data->sg_len, host->dma_dir);
368 if (nents != data->sg_len)
369 return -EINVAL;
370
371 host->desc = dmaengine_prep_slave_sg(host->dma,
372 data->sg, data->sg_len, slave_dirn,
373 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
374
375 if (!host->desc) {
376 dma_unmap_sg(host->dma->device->dev, data->sg, data->sg_len,
377 host->dma_dir);
378 host->do_dma = 0;
379 return 0; /* Fall back to PIO */
380 }
381 wmb();
382
383 dmaengine_submit(host->desc);
384 dma_async_issue_pending(host->dma);
385
386 mod_timer(&host->watchdog, jiffies + msecs_to_jiffies(MXCMCI_TIMEOUT_MS));
387
388 return 0;
389 }
390
391 static void mxcmci_cmd_done(struct mxcmci_host *host, unsigned int stat);
392 static void mxcmci_data_done(struct mxcmci_host *host, unsigned int stat);
393
394 static void mxcmci_dma_callback(void *data)
395 {
396 struct mxcmci_host *host = data;
397 u32 stat;
398
399 del_timer(&host->watchdog);
400
401 stat = mxcmci_readl(host, MMC_REG_STATUS);
402 mxcmci_writel(host, stat & ~STATUS_DATA_TRANS_DONE, MMC_REG_STATUS);
403
404 dev_dbg(mmc_dev(host->mmc), "%s: 0x%08x\n", __func__, stat);
405
406 if (stat & STATUS_READ_OP_DONE)
407 mxcmci_writel(host, STATUS_READ_OP_DONE, MMC_REG_STATUS);
408
409 mxcmci_data_done(host, stat);
410 }
411
412 static int mxcmci_start_cmd(struct mxcmci_host *host, struct mmc_command *cmd,
413 unsigned int cmdat)
414 {
415 u32 int_cntr = host->default_irq_mask;
416 unsigned long flags;
417
418 WARN_ON(host->cmd != NULL);
419 host->cmd = cmd;
420
421 switch (mmc_resp_type(cmd)) {
422 case MMC_RSP_R1: /* short CRC, OPCODE */
423 case MMC_RSP_R1B:/* short CRC, OPCODE, BUSY */
424 cmdat |= CMD_DAT_CONT_RESPONSE_48BIT_CRC;
425 break;
426 case MMC_RSP_R2: /* long 136 bit + CRC */
427 cmdat |= CMD_DAT_CONT_RESPONSE_136BIT;
428 break;
429 case MMC_RSP_R3: /* short */
430 cmdat |= CMD_DAT_CONT_RESPONSE_48BIT;
431 break;
432 case MMC_RSP_NONE:
433 break;
434 default:
435 dev_err(mmc_dev(host->mmc), "unhandled response type 0x%x\n",
436 mmc_resp_type(cmd));
437 cmd->error = -EINVAL;
438 return -EINVAL;
439 }
440
441 int_cntr = INT_END_CMD_RES_EN;
442
443 if (mxcmci_use_dma(host)) {
444 if (host->dma_dir == DMA_FROM_DEVICE) {
445 host->desc->callback = mxcmci_dma_callback;
446 host->desc->callback_param = host;
447 } else {
448 int_cntr |= INT_WRITE_OP_DONE_EN;
449 }
450 }
451
452 spin_lock_irqsave(&host->lock, flags);
453 if (host->use_sdio)
454 int_cntr |= INT_SDIO_IRQ_EN;
455 mxcmci_writel(host, int_cntr, MMC_REG_INT_CNTR);
456 spin_unlock_irqrestore(&host->lock, flags);
457
458 mxcmci_writew(host, cmd->opcode, MMC_REG_CMD);
459 mxcmci_writel(host, cmd->arg, MMC_REG_ARG);
460 mxcmci_writew(host, cmdat, MMC_REG_CMD_DAT_CONT);
461
462 return 0;
463 }
464
465 static void mxcmci_finish_request(struct mxcmci_host *host,
466 struct mmc_request *req)
467 {
468 u32 int_cntr = host->default_irq_mask;
469 unsigned long flags;
470
471 spin_lock_irqsave(&host->lock, flags);
472 if (host->use_sdio)
473 int_cntr |= INT_SDIO_IRQ_EN;
474 mxcmci_writel(host, int_cntr, MMC_REG_INT_CNTR);
475 spin_unlock_irqrestore(&host->lock, flags);
476
477 host->req = NULL;
478 host->cmd = NULL;
479 host->data = NULL;
480
481 mmc_request_done(host->mmc, req);
482 }
483
484 static int mxcmci_finish_data(struct mxcmci_host *host, unsigned int stat)
485 {
486 struct mmc_data *data = host->data;
487 int data_error;
488
489 if (mxcmci_use_dma(host)) {
490 dma_unmap_sg(host->dma->device->dev, data->sg, data->sg_len,
491 host->dma_dir);
492 mxcmci_swap_buffers(data);
493 }
494
495 if (stat & STATUS_ERR_MASK) {
496 dev_dbg(mmc_dev(host->mmc), "request failed. status: 0x%08x\n",
497 stat);
498 if (stat & STATUS_CRC_READ_ERR) {
499 dev_err(mmc_dev(host->mmc), "%s: -EILSEQ\n", __func__);
500 data->error = -EILSEQ;
501 } else if (stat & STATUS_CRC_WRITE_ERR) {
502 u32 err_code = (stat >> 9) & 0x3;
503 if (err_code == 2) { /* No CRC response */
504 dev_err(mmc_dev(host->mmc),
505 "%s: No CRC -ETIMEDOUT\n", __func__);
506 data->error = -ETIMEDOUT;
507 } else {
508 dev_err(mmc_dev(host->mmc),
509 "%s: -EILSEQ\n", __func__);
510 data->error = -EILSEQ;
511 }
512 } else if (stat & STATUS_TIME_OUT_READ) {
513 dev_err(mmc_dev(host->mmc),
514 "%s: read -ETIMEDOUT\n", __func__);
515 data->error = -ETIMEDOUT;
516 } else {
517 dev_err(mmc_dev(host->mmc), "%s: -EIO\n", __func__);
518 data->error = -EIO;
519 }
520 } else {
521 data->bytes_xfered = host->datasize;
522 }
523
524 data_error = data->error;
525
526 host->data = NULL;
527
528 return data_error;
529 }
530
531 static void mxcmci_read_response(struct mxcmci_host *host, unsigned int stat)
532 {
533 struct mmc_command *cmd = host->cmd;
534 int i;
535 u32 a, b, c;
536
537 if (!cmd)
538 return;
539
540 if (stat & STATUS_TIME_OUT_RESP) {
541 dev_dbg(mmc_dev(host->mmc), "CMD TIMEOUT\n");
542 cmd->error = -ETIMEDOUT;
543 } else if (stat & STATUS_RESP_CRC_ERR && cmd->flags & MMC_RSP_CRC) {
544 dev_dbg(mmc_dev(host->mmc), "cmd crc error\n");
545 cmd->error = -EILSEQ;
546 }
547
548 if (cmd->flags & MMC_RSP_PRESENT) {
549 if (cmd->flags & MMC_RSP_136) {
550 for (i = 0; i < 4; i++) {
551 a = mxcmci_readw(host, MMC_REG_RES_FIFO);
552 b = mxcmci_readw(host, MMC_REG_RES_FIFO);
553 cmd->resp[i] = a << 16 | b;
554 }
555 } else {
556 a = mxcmci_readw(host, MMC_REG_RES_FIFO);
557 b = mxcmci_readw(host, MMC_REG_RES_FIFO);
558 c = mxcmci_readw(host, MMC_REG_RES_FIFO);
559 cmd->resp[0] = a << 24 | b << 8 | c >> 8;
560 }
561 }
562 }
563
564 static int mxcmci_poll_status(struct mxcmci_host *host, u32 mask)
565 {
566 u32 stat;
567 unsigned long timeout = jiffies + HZ;
568
569 do {
570 stat = mxcmci_readl(host, MMC_REG_STATUS);
571 if (stat & STATUS_ERR_MASK)
572 return stat;
573 if (time_after(jiffies, timeout)) {
574 mxcmci_softreset(host);
575 mxcmci_set_clk_rate(host, host->clock);
576 return STATUS_TIME_OUT_READ;
577 }
578 if (stat & mask)
579 return 0;
580 cpu_relax();
581 } while (1);
582 }
583
584 static int mxcmci_pull(struct mxcmci_host *host, void *_buf, int bytes)
585 {
586 unsigned int stat;
587 u32 *buf = _buf;
588
589 while (bytes > 3) {
590 stat = mxcmci_poll_status(host,
591 STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE);
592 if (stat)
593 return stat;
594 *buf++ = cpu_to_le32(mxcmci_readl(host, MMC_REG_BUFFER_ACCESS));
595 bytes -= 4;
596 }
597
598 if (bytes) {
599 u8 *b = (u8 *)buf;
600 u32 tmp;
601
602 stat = mxcmci_poll_status(host,
603 STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE);
604 if (stat)
605 return stat;
606 tmp = cpu_to_le32(mxcmci_readl(host, MMC_REG_BUFFER_ACCESS));
607 memcpy(b, &tmp, bytes);
608 }
609
610 return 0;
611 }
612
613 static int mxcmci_push(struct mxcmci_host *host, void *_buf, int bytes)
614 {
615 unsigned int stat;
616 u32 *buf = _buf;
617
618 while (bytes > 3) {
619 stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
620 if (stat)
621 return stat;
622 mxcmci_writel(host, cpu_to_le32(*buf++), MMC_REG_BUFFER_ACCESS);
623 bytes -= 4;
624 }
625
626 if (bytes) {
627 u8 *b = (u8 *)buf;
628 u32 tmp;
629
630 stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
631 if (stat)
632 return stat;
633
634 memcpy(&tmp, b, bytes);
635 mxcmci_writel(host, cpu_to_le32(tmp), MMC_REG_BUFFER_ACCESS);
636 }
637
638 stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
639 if (stat)
640 return stat;
641
642 return 0;
643 }
644
645 static int mxcmci_transfer_data(struct mxcmci_host *host)
646 {
647 struct mmc_data *data = host->req->data;
648 struct scatterlist *sg;
649 int stat, i;
650
651 host->data = data;
652 host->datasize = 0;
653
654 if (data->flags & MMC_DATA_READ) {
655 for_each_sg(data->sg, sg, data->sg_len, i) {
656 stat = mxcmci_pull(host, sg_virt(sg), sg->length);
657 if (stat)
658 return stat;
659 host->datasize += sg->length;
660 }
661 } else {
662 for_each_sg(data->sg, sg, data->sg_len, i) {
663 stat = mxcmci_push(host, sg_virt(sg), sg->length);
664 if (stat)
665 return stat;
666 host->datasize += sg->length;
667 }
668 stat = mxcmci_poll_status(host, STATUS_WRITE_OP_DONE);
669 if (stat)
670 return stat;
671 }
672 return 0;
673 }
674
675 static void mxcmci_datawork(struct work_struct *work)
676 {
677 struct mxcmci_host *host = container_of(work, struct mxcmci_host,
678 datawork);
679 int datastat = mxcmci_transfer_data(host);
680
681 mxcmci_writel(host, STATUS_READ_OP_DONE | STATUS_WRITE_OP_DONE,
682 MMC_REG_STATUS);
683 mxcmci_finish_data(host, datastat);
684
685 if (host->req->stop) {
686 if (mxcmci_start_cmd(host, host->req->stop, 0)) {
687 mxcmci_finish_request(host, host->req);
688 return;
689 }
690 } else {
691 mxcmci_finish_request(host, host->req);
692 }
693 }
694
695 static void mxcmci_data_done(struct mxcmci_host *host, unsigned int stat)
696 {
697 struct mmc_request *req;
698 int data_error;
699 unsigned long flags;
700
701 spin_lock_irqsave(&host->lock, flags);
702
703 if (!host->data) {
704 spin_unlock_irqrestore(&host->lock, flags);
705 return;
706 }
707
708 if (!host->req) {
709 spin_unlock_irqrestore(&host->lock, flags);
710 return;
711 }
712
713 req = host->req;
714 if (!req->stop)
715 host->req = NULL; /* we will handle finish req below */
716
717 data_error = mxcmci_finish_data(host, stat);
718
719 spin_unlock_irqrestore(&host->lock, flags);
720
721 mxcmci_read_response(host, stat);
722 host->cmd = NULL;
723
724 if (req->stop) {
725 if (mxcmci_start_cmd(host, req->stop, 0)) {
726 mxcmci_finish_request(host, req);
727 return;
728 }
729 } else {
730 mxcmci_finish_request(host, req);
731 }
732 }
733
734 static void mxcmci_cmd_done(struct mxcmci_host *host, unsigned int stat)
735 {
736 mxcmci_read_response(host, stat);
737 host->cmd = NULL;
738
739 if (!host->data && host->req) {
740 mxcmci_finish_request(host, host->req);
741 return;
742 }
743
744 /* For the DMA case the DMA engine handles the data transfer
745 * automatically. For non DMA we have to do it ourselves.
746 * Don't do it in interrupt context though.
747 */
748 if (!mxcmci_use_dma(host) && host->data)
749 schedule_work(&host->datawork);
750
751 }
752
753 static irqreturn_t mxcmci_irq(int irq, void *devid)
754 {
755 struct mxcmci_host *host = devid;
756 unsigned long flags;
757 bool sdio_irq;
758 u32 stat;
759
760 stat = mxcmci_readl(host, MMC_REG_STATUS);
761 mxcmci_writel(host,
762 stat & ~(STATUS_SDIO_INT_ACTIVE | STATUS_DATA_TRANS_DONE |
763 STATUS_WRITE_OP_DONE),
764 MMC_REG_STATUS);
765
766 dev_dbg(mmc_dev(host->mmc), "%s: 0x%08x\n", __func__, stat);
767
768 spin_lock_irqsave(&host->lock, flags);
769 sdio_irq = (stat & STATUS_SDIO_INT_ACTIVE) && host->use_sdio;
770 spin_unlock_irqrestore(&host->lock, flags);
771
772 if (mxcmci_use_dma(host) &&
773 (stat & (STATUS_READ_OP_DONE | STATUS_WRITE_OP_DONE)))
774 mxcmci_writel(host, STATUS_READ_OP_DONE | STATUS_WRITE_OP_DONE,
775 MMC_REG_STATUS);
776
777 if (sdio_irq) {
778 mxcmci_writel(host, STATUS_SDIO_INT_ACTIVE, MMC_REG_STATUS);
779 mmc_signal_sdio_irq(host->mmc);
780 }
781
782 if (stat & STATUS_END_CMD_RESP)
783 mxcmci_cmd_done(host, stat);
784
785 if (mxcmci_use_dma(host) &&
786 (stat & (STATUS_DATA_TRANS_DONE | STATUS_WRITE_OP_DONE))) {
787 del_timer(&host->watchdog);
788 mxcmci_data_done(host, stat);
789 }
790
791 if (host->default_irq_mask &&
792 (stat & (STATUS_CARD_INSERTION | STATUS_CARD_REMOVAL)))
793 mmc_detect_change(host->mmc, msecs_to_jiffies(200));
794
795 return IRQ_HANDLED;
796 }
797
798 static void mxcmci_request(struct mmc_host *mmc, struct mmc_request *req)
799 {
800 struct mxcmci_host *host = mmc_priv(mmc);
801 unsigned int cmdat = host->cmdat;
802 int error;
803
804 WARN_ON(host->req != NULL);
805
806 host->req = req;
807 host->cmdat &= ~CMD_DAT_CONT_INIT;
808
809 if (host->dma)
810 host->do_dma = 1;
811
812 if (req->data) {
813 error = mxcmci_setup_data(host, req->data);
814 if (error) {
815 req->cmd->error = error;
816 goto out;
817 }
818
819
820 cmdat |= CMD_DAT_CONT_DATA_ENABLE;
821
822 if (req->data->flags & MMC_DATA_WRITE)
823 cmdat |= CMD_DAT_CONT_WRITE;
824 }
825
826 error = mxcmci_start_cmd(host, req->cmd, cmdat);
827
828 out:
829 if (error)
830 mxcmci_finish_request(host, req);
831 }
832
833 static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios)
834 {
835 unsigned int divider;
836 int prescaler = 0;
837 unsigned int clk_in = clk_get_rate(host->clk_per);
838
839 while (prescaler <= 0x800) {
840 for (divider = 1; divider <= 0xF; divider++) {
841 int x;
842
843 x = (clk_in / (divider + 1));
844
845 if (prescaler)
846 x /= (prescaler * 2);
847
848 if (x <= clk_ios)
849 break;
850 }
851 if (divider < 0x10)
852 break;
853
854 if (prescaler == 0)
855 prescaler = 1;
856 else
857 prescaler <<= 1;
858 }
859
860 mxcmci_writew(host, (prescaler << 4) | divider, MMC_REG_CLK_RATE);
861
862 dev_dbg(mmc_dev(host->mmc), "scaler: %d divider: %d in: %d out: %d\n",
863 prescaler, divider, clk_in, clk_ios);
864 }
865
866 static int mxcmci_setup_dma(struct mmc_host *mmc)
867 {
868 struct mxcmci_host *host = mmc_priv(mmc);
869 struct dma_slave_config *config = &host->dma_slave_config;
870
871 config->dst_addr = host->res->start + MMC_REG_BUFFER_ACCESS;
872 config->src_addr = host->res->start + MMC_REG_BUFFER_ACCESS;
873 config->dst_addr_width = 4;
874 config->src_addr_width = 4;
875 config->dst_maxburst = host->burstlen;
876 config->src_maxburst = host->burstlen;
877 config->device_fc = false;
878
879 return dmaengine_slave_config(host->dma, config);
880 }
881
882 static void mxcmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
883 {
884 struct mxcmci_host *host = mmc_priv(mmc);
885 int burstlen, ret;
886
887 /*
888 * use burstlen of 64 (16 words) in 4 bit mode (--> reg value 0)
889 * use burstlen of 16 (4 words) in 1 bit mode (--> reg value 16)
890 */
891 if (ios->bus_width == MMC_BUS_WIDTH_4)
892 burstlen = 16;
893 else
894 burstlen = 4;
895
896 if (mxcmci_use_dma(host) && burstlen != host->burstlen) {
897 host->burstlen = burstlen;
898 ret = mxcmci_setup_dma(mmc);
899 if (ret) {
900 dev_err(mmc_dev(host->mmc),
901 "failed to config DMA channel. Falling back to PIO\n");
902 dma_release_channel(host->dma);
903 host->do_dma = 0;
904 host->dma = NULL;
905 }
906 }
907
908 if (ios->bus_width == MMC_BUS_WIDTH_4)
909 host->cmdat |= CMD_DAT_CONT_BUS_WIDTH_4;
910 else
911 host->cmdat &= ~CMD_DAT_CONT_BUS_WIDTH_4;
912
913 if (host->power_mode != ios->power_mode) {
914 mxcmci_set_power(host, ios->power_mode, ios->vdd);
915 host->power_mode = ios->power_mode;
916
917 if (ios->power_mode == MMC_POWER_ON)
918 host->cmdat |= CMD_DAT_CONT_INIT;
919 }
920
921 if (ios->clock) {
922 mxcmci_set_clk_rate(host, ios->clock);
923 mxcmci_writew(host, STR_STP_CLK_START_CLK, MMC_REG_STR_STP_CLK);
924 } else {
925 mxcmci_writew(host, STR_STP_CLK_STOP_CLK, MMC_REG_STR_STP_CLK);
926 }
927
928 host->clock = ios->clock;
929 }
930
931 static irqreturn_t mxcmci_detect_irq(int irq, void *data)
932 {
933 struct mmc_host *mmc = data;
934
935 dev_dbg(mmc_dev(mmc), "%s\n", __func__);
936
937 mmc_detect_change(mmc, msecs_to_jiffies(250));
938 return IRQ_HANDLED;
939 }
940
941 static int mxcmci_get_ro(struct mmc_host *mmc)
942 {
943 struct mxcmci_host *host = mmc_priv(mmc);
944
945 if (host->pdata && host->pdata->get_ro)
946 return !!host->pdata->get_ro(mmc_dev(mmc));
947 /*
948 * If board doesn't support read only detection (no mmc_gpio
949 * context or gpio is invalid), then let the mmc core decide
950 * what to do.
951 */
952 return mmc_gpio_get_ro(mmc);
953 }
954
955 static void mxcmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
956 {
957 struct mxcmci_host *host = mmc_priv(mmc);
958 unsigned long flags;
959 u32 int_cntr;
960
961 spin_lock_irqsave(&host->lock, flags);
962 host->use_sdio = enable;
963 int_cntr = mxcmci_readl(host, MMC_REG_INT_CNTR);
964
965 if (enable)
966 int_cntr |= INT_SDIO_IRQ_EN;
967 else
968 int_cntr &= ~INT_SDIO_IRQ_EN;
969
970 mxcmci_writel(host, int_cntr, MMC_REG_INT_CNTR);
971 spin_unlock_irqrestore(&host->lock, flags);
972 }
973
974 static void mxcmci_init_card(struct mmc_host *host, struct mmc_card *card)
975 {
976 struct mxcmci_host *mxcmci = mmc_priv(host);
977
978 /*
979 * MX3 SoCs have a silicon bug which corrupts CRC calculation of
980 * multi-block transfers when connected SDIO peripheral doesn't
981 * drive the BUSY line as required by the specs.
982 * One way to prevent this is to only allow 1-bit transfers.
983 */
984
985 if (is_imx31_mmc(mxcmci) && card->type == MMC_TYPE_SDIO)
986 host->caps &= ~MMC_CAP_4_BIT_DATA;
987 else
988 host->caps |= MMC_CAP_4_BIT_DATA;
989 }
990
991 static bool filter(struct dma_chan *chan, void *param)
992 {
993 struct mxcmci_host *host = param;
994
995 if (!imx_dma_is_general_purpose(chan))
996 return false;
997
998 chan->private = &host->dma_data;
999
1000 return true;
1001 }
1002
1003 static void mxcmci_watchdog(unsigned long data)
1004 {
1005 struct mmc_host *mmc = (struct mmc_host *)data;
1006 struct mxcmci_host *host = mmc_priv(mmc);
1007 struct mmc_request *req = host->req;
1008 unsigned int stat = mxcmci_readl(host, MMC_REG_STATUS);
1009
1010 if (host->dma_dir == DMA_FROM_DEVICE) {
1011 dmaengine_terminate_all(host->dma);
1012 dev_err(mmc_dev(host->mmc),
1013 "%s: read time out (status = 0x%08x)\n",
1014 __func__, stat);
1015 } else {
1016 dev_err(mmc_dev(host->mmc),
1017 "%s: write time out (status = 0x%08x)\n",
1018 __func__, stat);
1019 mxcmci_softreset(host);
1020 }
1021
1022 /* Mark transfer as erroneus and inform the upper layers */
1023
1024 if (host->data)
1025 host->data->error = -ETIMEDOUT;
1026 host->req = NULL;
1027 host->cmd = NULL;
1028 host->data = NULL;
1029 mmc_request_done(host->mmc, req);
1030 }
1031
1032 static const struct mmc_host_ops mxcmci_ops = {
1033 .request = mxcmci_request,
1034 .set_ios = mxcmci_set_ios,
1035 .get_ro = mxcmci_get_ro,
1036 .enable_sdio_irq = mxcmci_enable_sdio_irq,
1037 .init_card = mxcmci_init_card,
1038 };
1039
1040 static int mxcmci_probe(struct platform_device *pdev)
1041 {
1042 struct mmc_host *mmc;
1043 struct mxcmci_host *host = NULL;
1044 struct resource *iores, *r;
1045 int ret = 0, irq;
1046 bool dat3_card_detect = false;
1047 dma_cap_mask_t mask;
1048 const struct of_device_id *of_id;
1049 struct imxmmc_platform_data *pdata = pdev->dev.platform_data;
1050
1051 pr_info("i.MX/MPC512x SDHC driver\n");
1052
1053 of_id = of_match_device(mxcmci_of_match, &pdev->dev);
1054
1055 iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1056 irq = platform_get_irq(pdev, 0);
1057 if (!iores || irq < 0)
1058 return -EINVAL;
1059
1060 r = request_mem_region(iores->start, resource_size(iores), pdev->name);
1061 if (!r)
1062 return -EBUSY;
1063
1064 mmc = mmc_alloc_host(sizeof(struct mxcmci_host), &pdev->dev);
1065 if (!mmc) {
1066 ret = -ENOMEM;
1067 goto out_release_mem;
1068 }
1069
1070 ret = mmc_of_parse(mmc);
1071 if (ret)
1072 goto out_free;
1073 mmc->ops = &mxcmci_ops;
1074
1075 /* For devicetree parsing, the bus width is read from devicetree */
1076 if (pdata)
1077 mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
1078 else
1079 mmc->caps |= MMC_CAP_SDIO_IRQ;
1080
1081 /* MMC core transfer sizes tunable parameters */
1082 mmc->max_blk_size = 2048;
1083 mmc->max_blk_count = 65535;
1084 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1085 mmc->max_seg_size = mmc->max_req_size;
1086
1087 host = mmc_priv(mmc);
1088 host->base = ioremap(r->start, resource_size(r));
1089 if (!host->base) {
1090 ret = -ENOMEM;
1091 goto out_free;
1092 }
1093
1094 if (of_id) {
1095 const struct platform_device_id *id_entry = of_id->data;
1096 host->devtype = id_entry->driver_data;
1097 } else {
1098 host->devtype = pdev->id_entry->driver_data;
1099 }
1100
1101 /* adjust max_segs after devtype detection */
1102 if (!is_mpc512x_mmc(host))
1103 mmc->max_segs = 64;
1104
1105 host->mmc = mmc;
1106 host->pdata = pdata;
1107 spin_lock_init(&host->lock);
1108
1109 if (pdata)
1110 dat3_card_detect = pdata->dat3_card_detect;
1111 else if (!(mmc->caps & MMC_CAP_NONREMOVABLE)
1112 && !of_property_read_bool(pdev->dev.of_node, "cd-gpios"))
1113 dat3_card_detect = true;
1114
1115 mxcmci_init_ocr(host);
1116
1117 if (dat3_card_detect)
1118 host->default_irq_mask =
1119 INT_CARD_INSERTION_EN | INT_CARD_REMOVAL_EN;
1120 else
1121 host->default_irq_mask = 0;
1122
1123 host->res = r;
1124 host->irq = irq;
1125
1126 host->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
1127 if (IS_ERR(host->clk_ipg)) {
1128 ret = PTR_ERR(host->clk_ipg);
1129 goto out_iounmap;
1130 }
1131
1132 host->clk_per = devm_clk_get(&pdev->dev, "per");
1133 if (IS_ERR(host->clk_per)) {
1134 ret = PTR_ERR(host->clk_per);
1135 goto out_iounmap;
1136 }
1137
1138 clk_prepare_enable(host->clk_per);
1139 clk_prepare_enable(host->clk_ipg);
1140
1141 mxcmci_softreset(host);
1142
1143 host->rev_no = mxcmci_readw(host, MMC_REG_REV_NO);
1144 if (host->rev_no != 0x400) {
1145 ret = -ENODEV;
1146 dev_err(mmc_dev(host->mmc), "wrong rev.no. 0x%08x. aborting.\n",
1147 host->rev_no);
1148 goto out_clk_put;
1149 }
1150
1151 mmc->f_min = clk_get_rate(host->clk_per) >> 16;
1152 mmc->f_max = clk_get_rate(host->clk_per) >> 1;
1153
1154 /* recommended in data sheet */
1155 mxcmci_writew(host, 0x2db4, MMC_REG_READ_TO);
1156
1157 mxcmci_writel(host, host->default_irq_mask, MMC_REG_INT_CNTR);
1158
1159 if (!host->pdata) {
1160 host->dma = dma_request_slave_channel(&pdev->dev, "rx-tx");
1161 } else {
1162 r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
1163 if (r) {
1164 host->dmareq = r->start;
1165 host->dma_data.peripheral_type = IMX_DMATYPE_SDHC;
1166 host->dma_data.priority = DMA_PRIO_LOW;
1167 host->dma_data.dma_request = host->dmareq;
1168 dma_cap_zero(mask);
1169 dma_cap_set(DMA_SLAVE, mask);
1170 host->dma = dma_request_channel(mask, filter, host);
1171 }
1172 }
1173 if (host->dma)
1174 mmc->max_seg_size = dma_get_max_seg_size(
1175 host->dma->device->dev);
1176 else
1177 dev_info(mmc_dev(host->mmc), "dma not available. Using PIO\n");
1178
1179 INIT_WORK(&host->datawork, mxcmci_datawork);
1180
1181 ret = request_irq(host->irq, mxcmci_irq, 0, DRIVER_NAME, host);
1182 if (ret)
1183 goto out_free_dma;
1184
1185 platform_set_drvdata(pdev, mmc);
1186
1187 if (host->pdata && host->pdata->init) {
1188 ret = host->pdata->init(&pdev->dev, mxcmci_detect_irq,
1189 host->mmc);
1190 if (ret)
1191 goto out_free_irq;
1192 }
1193
1194 init_timer(&host->watchdog);
1195 host->watchdog.function = &mxcmci_watchdog;
1196 host->watchdog.data = (unsigned long)mmc;
1197
1198 mmc_add_host(mmc);
1199
1200 return 0;
1201
1202 out_free_irq:
1203 free_irq(host->irq, host);
1204 out_free_dma:
1205 if (host->dma)
1206 dma_release_channel(host->dma);
1207 out_clk_put:
1208 clk_disable_unprepare(host->clk_per);
1209 clk_disable_unprepare(host->clk_ipg);
1210 out_iounmap:
1211 iounmap(host->base);
1212 out_free:
1213 mmc_free_host(mmc);
1214 out_release_mem:
1215 release_mem_region(iores->start, resource_size(iores));
1216 return ret;
1217 }
1218
1219 static int mxcmci_remove(struct platform_device *pdev)
1220 {
1221 struct mmc_host *mmc = platform_get_drvdata(pdev);
1222 struct mxcmci_host *host = mmc_priv(mmc);
1223
1224 mmc_remove_host(mmc);
1225
1226 if (host->vcc)
1227 regulator_put(host->vcc);
1228
1229 if (host->pdata && host->pdata->exit)
1230 host->pdata->exit(&pdev->dev, mmc);
1231
1232 free_irq(host->irq, host);
1233 iounmap(host->base);
1234
1235 if (host->dma)
1236 dma_release_channel(host->dma);
1237
1238 clk_disable_unprepare(host->clk_per);
1239 clk_disable_unprepare(host->clk_ipg);
1240
1241 release_mem_region(host->res->start, resource_size(host->res));
1242
1243 mmc_free_host(mmc);
1244
1245 return 0;
1246 }
1247
1248 #ifdef CONFIG_PM
1249 static int mxcmci_suspend(struct device *dev)
1250 {
1251 struct mmc_host *mmc = dev_get_drvdata(dev);
1252 struct mxcmci_host *host = mmc_priv(mmc);
1253
1254 clk_disable_unprepare(host->clk_per);
1255 clk_disable_unprepare(host->clk_ipg);
1256 return 0;
1257 }
1258
1259 static int mxcmci_resume(struct device *dev)
1260 {
1261 struct mmc_host *mmc = dev_get_drvdata(dev);
1262 struct mxcmci_host *host = mmc_priv(mmc);
1263
1264 clk_prepare_enable(host->clk_per);
1265 clk_prepare_enable(host->clk_ipg);
1266 return 0;
1267 }
1268
1269 static const struct dev_pm_ops mxcmci_pm_ops = {
1270 .suspend = mxcmci_suspend,
1271 .resume = mxcmci_resume,
1272 };
1273 #endif
1274
1275 static struct platform_driver mxcmci_driver = {
1276 .probe = mxcmci_probe,
1277 .remove = mxcmci_remove,
1278 .id_table = mxcmci_devtype,
1279 .driver = {
1280 .name = DRIVER_NAME,
1281 .owner = THIS_MODULE,
1282 #ifdef CONFIG_PM
1283 .pm = &mxcmci_pm_ops,
1284 #endif
1285 .of_match_table = mxcmci_of_match,
1286 }
1287 };
1288
1289 module_platform_driver(mxcmci_driver);
1290
1291 MODULE_DESCRIPTION("i.MX Multimedia Card Interface Driver");
1292 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
1293 MODULE_LICENSE("GPL");
1294 MODULE_ALIAS("platform:mxc-mmc");
Linux with added FPC-III support