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Adding support for MOXA ART SoC. Testing port of linux-2.6.32.60-moxart.
[linux-3.6.7-moxart.git] / drivers / mmc / host / mxcmmc.c
blob28ed52d58f7f5262d2ab9500095ee7ec478337f5
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
38 #include <asm/dma.h>
39 #include <asm/irq.h>
40 #include <asm/sizes.h>
41 #include <mach/mmc.h>
42
43 #include <mach/dma.h>
44 #include <mach/hardware.h>
45
46 #define DRIVER_NAME "mxc-mmc"
47
48 #define MMC_REG_STR_STP_CLK 0x00
49 #define MMC_REG_STATUS 0x04
50 #define MMC_REG_CLK_RATE 0x08
51 #define MMC_REG_CMD_DAT_CONT 0x0C
52 #define MMC_REG_RES_TO 0x10
53 #define MMC_REG_READ_TO 0x14
54 #define MMC_REG_BLK_LEN 0x18
55 #define MMC_REG_NOB 0x1C
56 #define MMC_REG_REV_NO 0x20
57 #define MMC_REG_INT_CNTR 0x24
58 #define MMC_REG_CMD 0x28
59 #define MMC_REG_ARG 0x2C
60 #define MMC_REG_RES_FIFO 0x34
61 #define MMC_REG_BUFFER_ACCESS 0x38
62
63 #define STR_STP_CLK_RESET (1 << 3)
64 #define STR_STP_CLK_START_CLK (1 << 1)
65 #define STR_STP_CLK_STOP_CLK (1 << 0)
66
67 #define STATUS_CARD_INSERTION (1 << 31)
68 #define STATUS_CARD_REMOVAL (1 << 30)
69 #define STATUS_YBUF_EMPTY (1 << 29)
70 #define STATUS_XBUF_EMPTY (1 << 28)
71 #define STATUS_YBUF_FULL (1 << 27)
72 #define STATUS_XBUF_FULL (1 << 26)
73 #define STATUS_BUF_UND_RUN (1 << 25)
74 #define STATUS_BUF_OVFL (1 << 24)
75 #define STATUS_SDIO_INT_ACTIVE (1 << 14)
76 #define STATUS_END_CMD_RESP (1 << 13)
77 #define STATUS_WRITE_OP_DONE (1 << 12)
78 #define STATUS_DATA_TRANS_DONE (1 << 11)
79 #define STATUS_READ_OP_DONE (1 << 11)
80 #define STATUS_WR_CRC_ERROR_CODE_MASK (3 << 10)
81 #define STATUS_CARD_BUS_CLK_RUN (1 << 8)
82 #define STATUS_BUF_READ_RDY (1 << 7)
83 #define STATUS_BUF_WRITE_RDY (1 << 6)
84 #define STATUS_RESP_CRC_ERR (1 << 5)
85 #define STATUS_CRC_READ_ERR (1 << 3)
86 #define STATUS_CRC_WRITE_ERR (1 << 2)
87 #define STATUS_TIME_OUT_RESP (1 << 1)
88 #define STATUS_TIME_OUT_READ (1 << 0)
89 #define STATUS_ERR_MASK 0x2f
90
91 #define CMD_DAT_CONT_CMD_RESP_LONG_OFF (1 << 12)
92 #define CMD_DAT_CONT_STOP_READWAIT (1 << 11)
93 #define CMD_DAT_CONT_START_READWAIT (1 << 10)
94 #define CMD_DAT_CONT_BUS_WIDTH_4 (2 << 8)
95 #define CMD_DAT_CONT_INIT (1 << 7)
96 #define CMD_DAT_CONT_WRITE (1 << 4)
97 #define CMD_DAT_CONT_DATA_ENABLE (1 << 3)
98 #define CMD_DAT_CONT_RESPONSE_48BIT_CRC (1 << 0)
99 #define CMD_DAT_CONT_RESPONSE_136BIT (2 << 0)
100 #define CMD_DAT_CONT_RESPONSE_48BIT (3 << 0)
101
102 #define INT_SDIO_INT_WKP_EN (1 << 18)
103 #define INT_CARD_INSERTION_WKP_EN (1 << 17)
104 #define INT_CARD_REMOVAL_WKP_EN (1 << 16)
105 #define INT_CARD_INSERTION_EN (1 << 15)
106 #define INT_CARD_REMOVAL_EN (1 << 14)
107 #define INT_SDIO_IRQ_EN (1 << 13)
108 #define INT_DAT0_EN (1 << 12)
109 #define INT_BUF_READ_EN (1 << 4)
110 #define INT_BUF_WRITE_EN (1 << 3)
111 #define INT_END_CMD_RES_EN (1 << 2)
112 #define INT_WRITE_OP_DONE_EN (1 << 1)
113 #define INT_READ_OP_EN (1 << 0)
114
115 struct mxcmci_host {
116 struct mmc_host *mmc;
117 struct resource *res;
118 void __iomem *base;
119 int irq;
120 int detect_irq;
121 struct dma_chan *dma;
122 struct dma_async_tx_descriptor *desc;
123 int do_dma;
124 int default_irq_mask;
125 int use_sdio;
126 unsigned int power_mode;
127 struct imxmmc_platform_data *pdata;
128
129 struct mmc_request *req;
130 struct mmc_command *cmd;
131 struct mmc_data *data;
132
133 unsigned int datasize;
134 unsigned int dma_dir;
135
136 u16 rev_no;
137 unsigned int cmdat;
138
139 struct clk *clk_ipg;
140 struct clk *clk_per;
141
142 int clock;
143
144 struct work_struct datawork;
145 spinlock_t lock;
146
147 struct regulator *vcc;
148
149 int burstlen;
150 int dmareq;
151 struct dma_slave_config dma_slave_config;
152 struct imx_dma_data dma_data;
153 };
154
155 static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios);
156
157 static inline void mxcmci_init_ocr(struct mxcmci_host *host)
158 {
159 host->vcc = regulator_get(mmc_dev(host->mmc), "vmmc");
160
161 if (IS_ERR(host->vcc)) {
162 host->vcc = NULL;
163 } else {
164 host->mmc->ocr_avail = mmc_regulator_get_ocrmask(host->vcc);
165 if (host->pdata && host->pdata->ocr_avail)
166 dev_warn(mmc_dev(host->mmc),
167 "pdata->ocr_avail will not be used\n");
168 }
169
170 if (host->vcc == NULL) {
171 /* fall-back to platform data */
172 if (host->pdata && host->pdata->ocr_avail)
173 host->mmc->ocr_avail = host->pdata->ocr_avail;
174 else
175 host->mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
176 }
177 }
178
179 static inline void mxcmci_set_power(struct mxcmci_host *host,
180 unsigned char power_mode,
181 unsigned int vdd)
182 {
183 if (host->vcc) {
184 if (power_mode == MMC_POWER_UP)
185 mmc_regulator_set_ocr(host->mmc, host->vcc, vdd);
186 else if (power_mode == MMC_POWER_OFF)
187 mmc_regulator_set_ocr(host->mmc, host->vcc, 0);
188 }
189
190 if (host->pdata && host->pdata->setpower)
191 host->pdata->setpower(mmc_dev(host->mmc), vdd);
192 }
193
194 static inline int mxcmci_use_dma(struct mxcmci_host *host)
195 {
196 return host->do_dma;
197 }
198
199 static void mxcmci_softreset(struct mxcmci_host *host)
200 {
201 int i;
202
203 dev_dbg(mmc_dev(host->mmc), "mxcmci_softreset\n");
204
205 /* reset sequence */
206 writew(STR_STP_CLK_RESET, host->base + MMC_REG_STR_STP_CLK);
207 writew(STR_STP_CLK_RESET | STR_STP_CLK_START_CLK,
208 host->base + MMC_REG_STR_STP_CLK);
209
210 for (i = 0; i < 8; i++)
211 writew(STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK);
212
213 writew(0xff, host->base + MMC_REG_RES_TO);
214 }
215 static int mxcmci_setup_dma(struct mmc_host *mmc);
216
217 static int mxcmci_setup_data(struct mxcmci_host *host, struct mmc_data *data)
218 {
219 unsigned int nob = data->blocks;
220 unsigned int blksz = data->blksz;
221 unsigned int datasize = nob * blksz;
222 struct scatterlist *sg;
223 enum dma_transfer_direction slave_dirn;
224 int i, nents;
225
226 if (data->flags & MMC_DATA_STREAM)
227 nob = 0xffff;
228
229 host->data = data;
230 data->bytes_xfered = 0;
231
232 writew(nob, host->base + MMC_REG_NOB);
233 writew(blksz, host->base + MMC_REG_BLK_LEN);
234 host->datasize = datasize;
235
236 if (!mxcmci_use_dma(host))
237 return 0;
238
239 for_each_sg(data->sg, sg, data->sg_len, i) {
240 if (sg->offset & 3 || sg->length & 3) {
241 host->do_dma = 0;
242 return 0;
243 }
244 }
245
246 if (data->flags & MMC_DATA_READ) {
247 host->dma_dir = DMA_FROM_DEVICE;
248 slave_dirn = DMA_DEV_TO_MEM;
249 } else {
250 host->dma_dir = DMA_TO_DEVICE;
251 slave_dirn = DMA_MEM_TO_DEV;
252 }
253
254 nents = dma_map_sg(host->dma->device->dev, data->sg,
255 data->sg_len, host->dma_dir);
256 if (nents != data->sg_len)
257 return -EINVAL;
258
259 host->desc = dmaengine_prep_slave_sg(host->dma,
260 data->sg, data->sg_len, slave_dirn,
261 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
262
263 if (!host->desc) {
264 dma_unmap_sg(host->dma->device->dev, data->sg, data->sg_len,
265 host->dma_dir);
266 host->do_dma = 0;
267 return 0; /* Fall back to PIO */
268 }
269 wmb();
270
271 dmaengine_submit(host->desc);
272 dma_async_issue_pending(host->dma);
273
274 return 0;
275 }
276
277 static int mxcmci_start_cmd(struct mxcmci_host *host, struct mmc_command *cmd,
278 unsigned int cmdat)
279 {
280 u32 int_cntr = host->default_irq_mask;
281 unsigned long flags;
282
283 WARN_ON(host->cmd != NULL);
284 host->cmd = cmd;
285
286 switch (mmc_resp_type(cmd)) {
287 case MMC_RSP_R1: /* short CRC, OPCODE */
288 case MMC_RSP_R1B:/* short CRC, OPCODE, BUSY */
289 cmdat |= CMD_DAT_CONT_RESPONSE_48BIT_CRC;
290 break;
291 case MMC_RSP_R2: /* long 136 bit + CRC */
292 cmdat |= CMD_DAT_CONT_RESPONSE_136BIT;
293 break;
294 case MMC_RSP_R3: /* short */
295 cmdat |= CMD_DAT_CONT_RESPONSE_48BIT;
296 break;
297 case MMC_RSP_NONE:
298 break;
299 default:
300 dev_err(mmc_dev(host->mmc), "unhandled response type 0x%x\n",
301 mmc_resp_type(cmd));
302 cmd->error = -EINVAL;
303 return -EINVAL;
304 }
305
306 int_cntr = INT_END_CMD_RES_EN;
307
308 if (mxcmci_use_dma(host))
309 int_cntr |= INT_READ_OP_EN | INT_WRITE_OP_DONE_EN;
310
311 spin_lock_irqsave(&host->lock, flags);
312 if (host->use_sdio)
313 int_cntr |= INT_SDIO_IRQ_EN;
314 writel(int_cntr, host->base + MMC_REG_INT_CNTR);
315 spin_unlock_irqrestore(&host->lock, flags);
316
317 writew(cmd->opcode, host->base + MMC_REG_CMD);
318 writel(cmd->arg, host->base + MMC_REG_ARG);
319 writew(cmdat, host->base + MMC_REG_CMD_DAT_CONT);
320
321 return 0;
322 }
323
324 static void mxcmci_finish_request(struct mxcmci_host *host,
325 struct mmc_request *req)
326 {
327 u32 int_cntr = host->default_irq_mask;
328 unsigned long flags;
329
330 spin_lock_irqsave(&host->lock, flags);
331 if (host->use_sdio)
332 int_cntr |= INT_SDIO_IRQ_EN;
333 writel(int_cntr, host->base + MMC_REG_INT_CNTR);
334 spin_unlock_irqrestore(&host->lock, flags);
335
336 host->req = NULL;
337 host->cmd = NULL;
338 host->data = NULL;
339
340 mmc_request_done(host->mmc, req);
341 }
342
343 static int mxcmci_finish_data(struct mxcmci_host *host, unsigned int stat)
344 {
345 struct mmc_data *data = host->data;
346 int data_error;
347
348 if (mxcmci_use_dma(host)) {
349 dmaengine_terminate_all(host->dma);
350 dma_unmap_sg(host->dma->device->dev, data->sg, data->sg_len,
351 host->dma_dir);
352 }
353
354 if (stat & STATUS_ERR_MASK) {
355 dev_dbg(mmc_dev(host->mmc), "request failed. status: 0x%08x\n",
356 stat);
357 if (stat & STATUS_CRC_READ_ERR) {
358 dev_err(mmc_dev(host->mmc), "%s: -EILSEQ\n", __func__);
359 data->error = -EILSEQ;
360 } else if (stat & STATUS_CRC_WRITE_ERR) {
361 u32 err_code = (stat >> 9) & 0x3;
362 if (err_code == 2) { /* No CRC response */
363 dev_err(mmc_dev(host->mmc),
364 "%s: No CRC -ETIMEDOUT\n", __func__);
365 data->error = -ETIMEDOUT;
366 } else {
367 dev_err(mmc_dev(host->mmc),
368 "%s: -EILSEQ\n", __func__);
369 data->error = -EILSEQ;
370 }
371 } else if (stat & STATUS_TIME_OUT_READ) {
372 dev_err(mmc_dev(host->mmc),
373 "%s: read -ETIMEDOUT\n", __func__);
374 data->error = -ETIMEDOUT;
375 } else {
376 dev_err(mmc_dev(host->mmc), "%s: -EIO\n", __func__);
377 data->error = -EIO;
378 }
379 } else {
380 data->bytes_xfered = host->datasize;
381 }
382
383 data_error = data->error;
384
385 host->data = NULL;
386
387 return data_error;
388 }
389
390 static void mxcmci_read_response(struct mxcmci_host *host, unsigned int stat)
391 {
392 struct mmc_command *cmd = host->cmd;
393 int i;
394 u32 a, b, c;
395
396 if (!cmd)
397 return;
398
399 if (stat & STATUS_TIME_OUT_RESP) {
400 dev_dbg(mmc_dev(host->mmc), "CMD TIMEOUT\n");
401 cmd->error = -ETIMEDOUT;
402 } else if (stat & STATUS_RESP_CRC_ERR && cmd->flags & MMC_RSP_CRC) {
403 dev_dbg(mmc_dev(host->mmc), "cmd crc error\n");
404 cmd->error = -EILSEQ;
405 }
406
407 if (cmd->flags & MMC_RSP_PRESENT) {
408 if (cmd->flags & MMC_RSP_136) {
409 for (i = 0; i < 4; i++) {
410 a = readw(host->base + MMC_REG_RES_FIFO);
411 b = readw(host->base + MMC_REG_RES_FIFO);
412 cmd->resp[i] = a << 16 | b;
413 }
414 } else {
415 a = readw(host->base + MMC_REG_RES_FIFO);
416 b = readw(host->base + MMC_REG_RES_FIFO);
417 c = readw(host->base + MMC_REG_RES_FIFO);
418 cmd->resp[0] = a << 24 | b << 8 | c >> 8;
419 }
420 }
421 }
422
423 static int mxcmci_poll_status(struct mxcmci_host *host, u32 mask)
424 {
425 u32 stat;
426 unsigned long timeout = jiffies + HZ;
427
428 do {
429 stat = readl(host->base + MMC_REG_STATUS);
430 if (stat & STATUS_ERR_MASK)
431 return stat;
432 if (time_after(jiffies, timeout)) {
433 mxcmci_softreset(host);
434 mxcmci_set_clk_rate(host, host->clock);
435 return STATUS_TIME_OUT_READ;
436 }
437 if (stat & mask)
438 return 0;
439 cpu_relax();
440 } while (1);
441 }
442
443 static int mxcmci_pull(struct mxcmci_host *host, void *_buf, int bytes)
444 {
445 unsigned int stat;
446 u32 *buf = _buf;
447
448 while (bytes > 3) {
449 stat = mxcmci_poll_status(host,
450 STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE);
451 if (stat)
452 return stat;
453 *buf++ = readl(host->base + MMC_REG_BUFFER_ACCESS);
454 bytes -= 4;
455 }
456
457 if (bytes) {
458 u8 *b = (u8 *)buf;
459 u32 tmp;
460
461 stat = mxcmci_poll_status(host,
462 STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE);
463 if (stat)
464 return stat;
465 tmp = readl(host->base + MMC_REG_BUFFER_ACCESS);
466 memcpy(b, &tmp, bytes);
467 }
468
469 return 0;
470 }
471
472 static int mxcmci_push(struct mxcmci_host *host, void *_buf, int bytes)
473 {
474 unsigned int stat;
475 u32 *buf = _buf;
476
477 while (bytes > 3) {
478 stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
479 if (stat)
480 return stat;
481 writel(*buf++, host->base + MMC_REG_BUFFER_ACCESS);
482 bytes -= 4;
483 }
484
485 if (bytes) {
486 u8 *b = (u8 *)buf;
487 u32 tmp;
488
489 stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
490 if (stat)
491 return stat;
492
493 memcpy(&tmp, b, bytes);
494 writel(tmp, host->base + MMC_REG_BUFFER_ACCESS);
495 }
496
497 stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
498 if (stat)
499 return stat;
500
501 return 0;
502 }
503
504 static int mxcmci_transfer_data(struct mxcmci_host *host)
505 {
506 struct mmc_data *data = host->req->data;
507 struct scatterlist *sg;
508 int stat, i;
509
510 host->data = data;
511 host->datasize = 0;
512
513 if (data->flags & MMC_DATA_READ) {
514 for_each_sg(data->sg, sg, data->sg_len, i) {
515 stat = mxcmci_pull(host, sg_virt(sg), sg->length);
516 if (stat)
517 return stat;
518 host->datasize += sg->length;
519 }
520 } else {
521 for_each_sg(data->sg, sg, data->sg_len, i) {
522 stat = mxcmci_push(host, sg_virt(sg), sg->length);
523 if (stat)
524 return stat;
525 host->datasize += sg->length;
526 }
527 stat = mxcmci_poll_status(host, STATUS_WRITE_OP_DONE);
528 if (stat)
529 return stat;
530 }
531 return 0;
532 }
533
534 static void mxcmci_datawork(struct work_struct *work)
535 {
536 struct mxcmci_host *host = container_of(work, struct mxcmci_host,
537 datawork);
538 int datastat = mxcmci_transfer_data(host);
539
540 writel(STATUS_READ_OP_DONE | STATUS_WRITE_OP_DONE,
541 host->base + MMC_REG_STATUS);
542 mxcmci_finish_data(host, datastat);
543
544 if (host->req->stop) {
545 if (mxcmci_start_cmd(host, host->req->stop, 0)) {
546 mxcmci_finish_request(host, host->req);
547 return;
548 }
549 } else {
550 mxcmci_finish_request(host, host->req);
551 }
552 }
553
554 static void mxcmci_data_done(struct mxcmci_host *host, unsigned int stat)
555 {
556 struct mmc_data *data = host->data;
557 int data_error;
558
559 if (!data)
560 return;
561
562 data_error = mxcmci_finish_data(host, stat);
563
564 mxcmci_read_response(host, stat);
565 host->cmd = NULL;
566
567 if (host->req->stop) {
568 if (mxcmci_start_cmd(host, host->req->stop, 0)) {
569 mxcmci_finish_request(host, host->req);
570 return;
571 }
572 } else {
573 mxcmci_finish_request(host, host->req);
574 }
575 }
576
577 static void mxcmci_cmd_done(struct mxcmci_host *host, unsigned int stat)
578 {
579 mxcmci_read_response(host, stat);
580 host->cmd = NULL;
581
582 if (!host->data && host->req) {
583 mxcmci_finish_request(host, host->req);
584 return;
585 }
586
587 /* For the DMA case the DMA engine handles the data transfer
588 * automatically. For non DMA we have to do it ourselves.
589 * Don't do it in interrupt context though.
590 */
591 if (!mxcmci_use_dma(host) && host->data)
592 schedule_work(&host->datawork);
593
594 }
595
596 static irqreturn_t mxcmci_irq(int irq, void *devid)
597 {
598 struct mxcmci_host *host = devid;
599 unsigned long flags;
600 bool sdio_irq;
601 u32 stat;
602
603 stat = readl(host->base + MMC_REG_STATUS);
604 writel(stat & ~(STATUS_SDIO_INT_ACTIVE | STATUS_DATA_TRANS_DONE |
605 STATUS_WRITE_OP_DONE), host->base + MMC_REG_STATUS);
606
607 dev_dbg(mmc_dev(host->mmc), "%s: 0x%08x\n", __func__, stat);
608
609 spin_lock_irqsave(&host->lock, flags);
610 sdio_irq = (stat & STATUS_SDIO_INT_ACTIVE) && host->use_sdio;
611 spin_unlock_irqrestore(&host->lock, flags);
612
613 if (mxcmci_use_dma(host) &&
614 (stat & (STATUS_READ_OP_DONE | STATUS_WRITE_OP_DONE)))
615 writel(STATUS_READ_OP_DONE | STATUS_WRITE_OP_DONE,
616 host->base + MMC_REG_STATUS);
617
618 if (sdio_irq) {
619 writel(STATUS_SDIO_INT_ACTIVE, host->base + MMC_REG_STATUS);
620 mmc_signal_sdio_irq(host->mmc);
621 }
622
623 if (stat & STATUS_END_CMD_RESP)
624 mxcmci_cmd_done(host, stat);
625
626 if (mxcmci_use_dma(host) &&
627 (stat & (STATUS_DATA_TRANS_DONE | STATUS_WRITE_OP_DONE)))
628 mxcmci_data_done(host, stat);
629
630 if (host->default_irq_mask &&
631 (stat & (STATUS_CARD_INSERTION | STATUS_CARD_REMOVAL)))
632 mmc_detect_change(host->mmc, msecs_to_jiffies(200));
633
634 return IRQ_HANDLED;
635 }
636
637 static void mxcmci_request(struct mmc_host *mmc, struct mmc_request *req)
638 {
639 struct mxcmci_host *host = mmc_priv(mmc);
640 unsigned int cmdat = host->cmdat;
641 int error;
642
643 WARN_ON(host->req != NULL);
644
645 host->req = req;
646 host->cmdat &= ~CMD_DAT_CONT_INIT;
647
648 if (host->dma)
649 host->do_dma = 1;
650
651 if (req->data) {
652 error = mxcmci_setup_data(host, req->data);
653 if (error) {
654 req->cmd->error = error;
655 goto out;
656 }
657
658
659 cmdat |= CMD_DAT_CONT_DATA_ENABLE;
660
661 if (req->data->flags & MMC_DATA_WRITE)
662 cmdat |= CMD_DAT_CONT_WRITE;
663 }
664
665 error = mxcmci_start_cmd(host, req->cmd, cmdat);
666
667 out:
668 if (error)
669 mxcmci_finish_request(host, req);
670 }
671
672 static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios)
673 {
674 unsigned int divider;
675 int prescaler = 0;
676 unsigned int clk_in = clk_get_rate(host->clk_per);
677
678 while (prescaler <= 0x800) {
679 for (divider = 1; divider <= 0xF; divider++) {
680 int x;
681
682 x = (clk_in / (divider + 1));
683
684 if (prescaler)
685 x /= (prescaler * 2);
686
687 if (x <= clk_ios)
688 break;
689 }
690 if (divider < 0x10)
691 break;
692
693 if (prescaler == 0)
694 prescaler = 1;
695 else
696 prescaler <<= 1;
697 }
698
699 writew((prescaler << 4) | divider, host->base + MMC_REG_CLK_RATE);
700
701 dev_dbg(mmc_dev(host->mmc), "scaler: %d divider: %d in: %d out: %d\n",
702 prescaler, divider, clk_in, clk_ios);
703 }
704
705 static int mxcmci_setup_dma(struct mmc_host *mmc)
706 {
707 struct mxcmci_host *host = mmc_priv(mmc);
708 struct dma_slave_config *config = &host->dma_slave_config;
709
710 config->dst_addr = host->res->start + MMC_REG_BUFFER_ACCESS;
711 config->src_addr = host->res->start + MMC_REG_BUFFER_ACCESS;
712 config->dst_addr_width = 4;
713 config->src_addr_width = 4;
714 config->dst_maxburst = host->burstlen;
715 config->src_maxburst = host->burstlen;
716 config->device_fc = false;
717
718 return dmaengine_slave_config(host->dma, config);
719 }
720
721 static void mxcmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
722 {
723 struct mxcmci_host *host = mmc_priv(mmc);
724 int burstlen, ret;
725
726 /*
727 * use burstlen of 64 (16 words) in 4 bit mode (--> reg value 0)
728 * use burstlen of 16 (4 words) in 1 bit mode (--> reg value 16)
729 */
730 if (ios->bus_width == MMC_BUS_WIDTH_4)
731 burstlen = 16;
732 else
733 burstlen = 4;
734
735 if (mxcmci_use_dma(host) && burstlen != host->burstlen) {
736 host->burstlen = burstlen;
737 ret = mxcmci_setup_dma(mmc);
738 if (ret) {
739 dev_err(mmc_dev(host->mmc),
740 "failed to config DMA channel. Falling back to PIO\n");
741 dma_release_channel(host->dma);
742 host->do_dma = 0;
743 host->dma = NULL;
744 }
745 }
746
747 if (ios->bus_width == MMC_BUS_WIDTH_4)
748 host->cmdat |= CMD_DAT_CONT_BUS_WIDTH_4;
749 else
750 host->cmdat &= ~CMD_DAT_CONT_BUS_WIDTH_4;
751
752 if (host->power_mode != ios->power_mode) {
753 mxcmci_set_power(host, ios->power_mode, ios->vdd);
754 host->power_mode = ios->power_mode;
755
756 if (ios->power_mode == MMC_POWER_ON)
757 host->cmdat |= CMD_DAT_CONT_INIT;
758 }
759
760 if (ios->clock) {
761 mxcmci_set_clk_rate(host, ios->clock);
762 writew(STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK);
763 } else {
764 writew(STR_STP_CLK_STOP_CLK, host->base + MMC_REG_STR_STP_CLK);
765 }
766
767 host->clock = ios->clock;
768 }
769
770 static irqreturn_t mxcmci_detect_irq(int irq, void *data)
771 {
772 struct mmc_host *mmc = data;
773
774 dev_dbg(mmc_dev(mmc), "%s\n", __func__);
775
776 mmc_detect_change(mmc, msecs_to_jiffies(250));
777 return IRQ_HANDLED;
778 }
779
780 static int mxcmci_get_ro(struct mmc_host *mmc)
781 {
782 struct mxcmci_host *host = mmc_priv(mmc);
783
784 if (host->pdata && host->pdata->get_ro)
785 return !!host->pdata->get_ro(mmc_dev(mmc));
786 /*
787 * Board doesn't support read only detection; let the mmc core
788 * decide what to do.
789 */
790 return -ENOSYS;
791 }
792
793 static void mxcmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
794 {
795 struct mxcmci_host *host = mmc_priv(mmc);
796 unsigned long flags;
797 u32 int_cntr;
798
799 spin_lock_irqsave(&host->lock, flags);
800 host->use_sdio = enable;
801 int_cntr = readl(host->base + MMC_REG_INT_CNTR);
802
803 if (enable)
804 int_cntr |= INT_SDIO_IRQ_EN;
805 else
806 int_cntr &= ~INT_SDIO_IRQ_EN;
807
808 writel(int_cntr, host->base + MMC_REG_INT_CNTR);
809 spin_unlock_irqrestore(&host->lock, flags);
810 }
811
812 static void mxcmci_init_card(struct mmc_host *host, struct mmc_card *card)
813 {
814 /*
815 * MX3 SoCs have a silicon bug which corrupts CRC calculation of
816 * multi-block transfers when connected SDIO peripheral doesn't
817 * drive the BUSY line as required by the specs.
818 * One way to prevent this is to only allow 1-bit transfers.
819 */
820
821 if (cpu_is_mx3() && card->type == MMC_TYPE_SDIO)
822 host->caps &= ~MMC_CAP_4_BIT_DATA;
823 else
824 host->caps |= MMC_CAP_4_BIT_DATA;
825 }
826
827 static bool filter(struct dma_chan *chan, void *param)
828 {
829 struct mxcmci_host *host = param;
830
831 if (!imx_dma_is_general_purpose(chan))
832 return false;
833
834 chan->private = &host->dma_data;
835
836 return true;
837 }
838
839 static const struct mmc_host_ops mxcmci_ops = {
840 .request = mxcmci_request,
841 .set_ios = mxcmci_set_ios,
842 .get_ro = mxcmci_get_ro,
843 .enable_sdio_irq = mxcmci_enable_sdio_irq,
844 .init_card = mxcmci_init_card,
845 };
846
847 static int mxcmci_probe(struct platform_device *pdev)
848 {
849 struct mmc_host *mmc;
850 struct mxcmci_host *host = NULL;
851 struct resource *iores, *r;
852 int ret = 0, irq;
853 dma_cap_mask_t mask;
854
855 pr_info("i.MX SDHC driver\n");
856
857 iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
858 irq = platform_get_irq(pdev, 0);
859 if (!iores || irq < 0)
860 return -EINVAL;
861
862 r = request_mem_region(iores->start, resource_size(iores), pdev->name);
863 if (!r)
864 return -EBUSY;
865
866 mmc = mmc_alloc_host(sizeof(struct mxcmci_host), &pdev->dev);
867 if (!mmc) {
868 ret = -ENOMEM;
869 goto out_release_mem;
870 }
871
872 mmc->ops = &mxcmci_ops;
873 mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
874
875 /* MMC core transfer sizes tunable parameters */
876 mmc->max_segs = 64;
877 mmc->max_blk_size = 2048;
878 mmc->max_blk_count = 65535;
879 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
880 mmc->max_seg_size = mmc->max_req_size;
881
882 host = mmc_priv(mmc);
883 host->base = ioremap(r->start, resource_size(r));
884 if (!host->base) {
885 ret = -ENOMEM;
886 goto out_free;
887 }
888
889 host->mmc = mmc;
890 host->pdata = pdev->dev.platform_data;
891 spin_lock_init(&host->lock);
892
893 mxcmci_init_ocr(host);
894
895 if (host->pdata && host->pdata->dat3_card_detect)
896 host->default_irq_mask =
897 INT_CARD_INSERTION_EN | INT_CARD_REMOVAL_EN;
898 else
899 host->default_irq_mask = 0;
900
901 host->res = r;
902 host->irq = irq;
903
904 host->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
905 if (IS_ERR(host->clk_ipg)) {
906 ret = PTR_ERR(host->clk_ipg);
907 goto out_iounmap;
908 }
909
910 host->clk_per = devm_clk_get(&pdev->dev, "per");
911 if (IS_ERR(host->clk_per)) {
912 ret = PTR_ERR(host->clk_per);
913 goto out_iounmap;
914 }
915
916 clk_prepare_enable(host->clk_per);
917 clk_prepare_enable(host->clk_ipg);
918
919 mxcmci_softreset(host);
920
921 host->rev_no = readw(host->base + MMC_REG_REV_NO);
922 if (host->rev_no != 0x400) {
923 ret = -ENODEV;
924 dev_err(mmc_dev(host->mmc), "wrong rev.no. 0x%08x. aborting.\n",
925 host->rev_no);
926 goto out_clk_put;
927 }
928
929 mmc->f_min = clk_get_rate(host->clk_per) >> 16;
930 mmc->f_max = clk_get_rate(host->clk_per) >> 1;
931
932 /* recommended in data sheet */
933 writew(0x2db4, host->base + MMC_REG_READ_TO);
934
935 writel(host->default_irq_mask, host->base + MMC_REG_INT_CNTR);
936
937 r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
938 if (r) {
939 host->dmareq = r->start;
940 host->dma_data.peripheral_type = IMX_DMATYPE_SDHC;
941 host->dma_data.priority = DMA_PRIO_LOW;
942 host->dma_data.dma_request = host->dmareq;
943 dma_cap_zero(mask);
944 dma_cap_set(DMA_SLAVE, mask);
945 host->dma = dma_request_channel(mask, filter, host);
946 if (host->dma)
947 mmc->max_seg_size = dma_get_max_seg_size(
948 host->dma->device->dev);
949 }
950
951 if (!host->dma)
952 dev_info(mmc_dev(host->mmc), "dma not available. Using PIO\n");
953
954 INIT_WORK(&host->datawork, mxcmci_datawork);
955
956 ret = request_irq(host->irq, mxcmci_irq, 0, DRIVER_NAME, host);
957 if (ret)
958 goto out_free_dma;
959
960 platform_set_drvdata(pdev, mmc);
961
962 if (host->pdata && host->pdata->init) {
963 ret = host->pdata->init(&pdev->dev, mxcmci_detect_irq,
964 host->mmc);
965 if (ret)
966 goto out_free_irq;
967 }
968
969 mmc_add_host(mmc);
970
971 return 0;
972
973 out_free_irq:
974 free_irq(host->irq, host);
975 out_free_dma:
976 if (host->dma)
977 dma_release_channel(host->dma);
978 out_clk_put:
979 clk_disable_unprepare(host->clk_per);
980 clk_disable_unprepare(host->clk_ipg);
981 out_iounmap:
982 iounmap(host->base);
983 out_free:
984 mmc_free_host(mmc);
985 out_release_mem:
986 release_mem_region(iores->start, resource_size(iores));
987 return ret;
988 }
989
990 static int mxcmci_remove(struct platform_device *pdev)
991 {
992 struct mmc_host *mmc = platform_get_drvdata(pdev);
993 struct mxcmci_host *host = mmc_priv(mmc);
994
995 platform_set_drvdata(pdev, NULL);
996
997 mmc_remove_host(mmc);
998
999 if (host->vcc)
1000 regulator_put(host->vcc);
1001
1002 if (host->pdata && host->pdata->exit)
1003 host->pdata->exit(&pdev->dev, mmc);
1004
1005 free_irq(host->irq, host);
1006 iounmap(host->base);
1007
1008 if (host->dma)
1009 dma_release_channel(host->dma);
1010
1011 clk_disable_unprepare(host->clk_per);
1012 clk_disable_unprepare(host->clk_ipg);
1013
1014 release_mem_region(host->res->start, resource_size(host->res));
1015
1016 mmc_free_host(mmc);
1017
1018 return 0;
1019 }
1020
1021 #ifdef CONFIG_PM
1022 static int mxcmci_suspend(struct device *dev)
1023 {
1024 struct mmc_host *mmc = dev_get_drvdata(dev);
1025 struct mxcmci_host *host = mmc_priv(mmc);
1026 int ret = 0;
1027
1028 if (mmc)
1029 ret = mmc_suspend_host(mmc);
1030 clk_disable_unprepare(host->clk_per);
1031 clk_disable_unprepare(host->clk_ipg);
1032
1033 return ret;
1034 }
1035
1036 static int mxcmci_resume(struct device *dev)
1037 {
1038 struct mmc_host *mmc = dev_get_drvdata(dev);
1039 struct mxcmci_host *host = mmc_priv(mmc);
1040 int ret = 0;
1041
1042 clk_prepare_enable(host->clk_per);
1043 clk_prepare_enable(host->clk_ipg);
1044 if (mmc)
1045 ret = mmc_resume_host(mmc);
1046
1047 return ret;
1048 }
1049
1050 static const struct dev_pm_ops mxcmci_pm_ops = {
1051 .suspend = mxcmci_suspend,
1052 .resume = mxcmci_resume,
1053 };
1054 #endif
1055
1056 static struct platform_driver mxcmci_driver = {
1057 .probe = mxcmci_probe,
1058 .remove = mxcmci_remove,
1059 .driver = {
1060 .name = DRIVER_NAME,
1061 .owner = THIS_MODULE,
1062 #ifdef CONFIG_PM
1063 .pm = &mxcmci_pm_ops,
1064 #endif
1065 }
1066 };
1067
1068 module_platform_driver(mxcmci_driver);
1069
1070 MODULE_DESCRIPTION("i.MX Multimedia Card Interface Driver");
1071 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
1072 MODULE_LICENSE("GPL");
1073 MODULE_ALIAS("platform:imx-mmc");
Linux ARM platform port for MOXA ART SoC