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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/drivers/mmc/host/mxcmmc.c - Freescale i.MX MMCI driver
4 *
5 * This is a driver for the SDHC controller found in Freescale MX2/MX3
6 * SoCs. It is basically the same hardware as found on MX1 (imxmmc.c).
7 * Unlike the hardware found on MX1, this hardware just works and does
8 * not need all the quirks found in imxmmc.c, hence the separate driver.
9 *
10 * Copyright (C) 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
11 * Copyright (C) 2006 Pavel Pisa, PiKRON <ppisa@pikron.com>
12 *
13 * derived from pxamci.c by Russell King
14 */
15
16#include <linux/module.h>
17#include <linux/init.h>
18#include <linux/ioport.h>
19#include <linux/platform_device.h>
20#include <linux/highmem.h>
21#include <linux/interrupt.h>
22#include <linux/irq.h>
23#include <linux/blkdev.h>
24#include <linux/dma-mapping.h>
25#include <linux/mmc/host.h>
26#include <linux/mmc/card.h>
27#include <linux/delay.h>
28#include <linux/clk.h>
29#include <linux/io.h>
30#include <linux/regulator/consumer.h>
31#include <linux/dmaengine.h>
32#include <linux/types.h>
33#include <linux/of.h>
34#include <linux/of_device.h>
35#include <linux/of_dma.h>
36#include <linux/mmc/slot-gpio.h>
37
38#include <asm/dma.h>
39#include <asm/irq.h>
40#include <linux/platform_data/mmc-mxcmmc.h>
41
42#include <linux/dma/imx-dma.h>
43
44#define DRIVER_NAME "mxc-mmc"
45#define MXCMCI_TIMEOUT_MS 10000
46
47#define MMC_REG_STR_STP_CLK 0x00
48#define MMC_REG_STATUS 0x04
49#define MMC_REG_CLK_RATE 0x08
50#define MMC_REG_CMD_DAT_CONT 0x0C
51#define MMC_REG_RES_TO 0x10
52#define MMC_REG_READ_TO 0x14
53#define MMC_REG_BLK_LEN 0x18
54#define MMC_REG_NOB 0x1C
55#define MMC_REG_REV_NO 0x20
56#define MMC_REG_INT_CNTR 0x24
57#define MMC_REG_CMD 0x28
58#define MMC_REG_ARG 0x2C
59#define MMC_REG_RES_FIFO 0x34
60#define MMC_REG_BUFFER_ACCESS 0x38
61
62#define STR_STP_CLK_RESET (1 << 3)
63#define STR_STP_CLK_START_CLK (1 << 1)
64#define STR_STP_CLK_STOP_CLK (1 << 0)
65
66#define STATUS_CARD_INSERTION (1 << 31)
67#define STATUS_CARD_REMOVAL (1 << 30)
68#define STATUS_YBUF_EMPTY (1 << 29)
69#define STATUS_XBUF_EMPTY (1 << 28)
70#define STATUS_YBUF_FULL (1 << 27)
71#define STATUS_XBUF_FULL (1 << 26)
72#define STATUS_BUF_UND_RUN (1 << 25)
73#define STATUS_BUF_OVFL (1 << 24)
74#define STATUS_SDIO_INT_ACTIVE (1 << 14)
75#define STATUS_END_CMD_RESP (1 << 13)
76#define STATUS_WRITE_OP_DONE (1 << 12)
77#define STATUS_DATA_TRANS_DONE (1 << 11)
78#define STATUS_READ_OP_DONE (1 << 11)
79#define STATUS_WR_CRC_ERROR_CODE_MASK (3 << 10)
80#define STATUS_CARD_BUS_CLK_RUN (1 << 8)
81#define STATUS_BUF_READ_RDY (1 << 7)
82#define STATUS_BUF_WRITE_RDY (1 << 6)
83#define STATUS_RESP_CRC_ERR (1 << 5)
84#define STATUS_CRC_READ_ERR (1 << 3)
85#define STATUS_CRC_WRITE_ERR (1 << 2)
86#define STATUS_TIME_OUT_RESP (1 << 1)
87#define STATUS_TIME_OUT_READ (1 << 0)
88#define STATUS_ERR_MASK 0x2f
89
90#define CMD_DAT_CONT_CMD_RESP_LONG_OFF (1 << 12)
91#define CMD_DAT_CONT_STOP_READWAIT (1 << 11)
92#define CMD_DAT_CONT_START_READWAIT (1 << 10)
93#define CMD_DAT_CONT_BUS_WIDTH_4 (2 << 8)
94#define CMD_DAT_CONT_INIT (1 << 7)
95#define CMD_DAT_CONT_WRITE (1 << 4)
96#define CMD_DAT_CONT_DATA_ENABLE (1 << 3)
97#define CMD_DAT_CONT_RESPONSE_48BIT_CRC (1 << 0)
98#define CMD_DAT_CONT_RESPONSE_136BIT (2 << 0)
99#define CMD_DAT_CONT_RESPONSE_48BIT (3 << 0)
100
101#define INT_SDIO_INT_WKP_EN (1 << 18)
102#define INT_CARD_INSERTION_WKP_EN (1 << 17)
103#define INT_CARD_REMOVAL_WKP_EN (1 << 16)
104#define INT_CARD_INSERTION_EN (1 << 15)
105#define INT_CARD_REMOVAL_EN (1 << 14)
106#define INT_SDIO_IRQ_EN (1 << 13)
107#define INT_DAT0_EN (1 << 12)
108#define INT_BUF_READ_EN (1 << 4)
109#define INT_BUF_WRITE_EN (1 << 3)
110#define INT_END_CMD_RES_EN (1 << 2)
111#define INT_WRITE_OP_DONE_EN (1 << 1)
112#define INT_READ_OP_EN (1 << 0)
113
114enum mxcmci_type {
115 IMX21_MMC,
116 IMX31_MMC,
117 MPC512X_MMC,
118};
119
120struct mxcmci_host {
121 struct mmc_host *mmc;
122 void __iomem *base;
123 dma_addr_t phys_base;
124 int detect_irq;
125 struct dma_chan *dma;
126 struct dma_async_tx_descriptor *desc;
127 int do_dma;
128 int default_irq_mask;
129 int use_sdio;
130 unsigned int power_mode;
131 struct imxmmc_platform_data *pdata;
132
133 struct mmc_request *req;
134 struct mmc_command *cmd;
135 struct mmc_data *data;
136
137 unsigned int datasize;
138 unsigned int dma_dir;
139
140 u16 rev_no;
141 unsigned int cmdat;
142
143 struct clk *clk_ipg;
144 struct clk *clk_per;
145
146 int clock;
147
148 struct work_struct datawork;
149 spinlock_t lock;
150
151 int burstlen;
152 int dmareq;
153 struct dma_slave_config dma_slave_config;
154 struct imx_dma_data dma_data;
155
156 struct timer_list watchdog;
157 enum mxcmci_type devtype;
158};
159
160static const struct of_device_id mxcmci_of_match[] = {
161 {
162 .compatible = "fsl,imx21-mmc",
163 .data = (void *) IMX21_MMC,
164 }, {
165 .compatible = "fsl,imx31-mmc",
166 .data = (void *) IMX31_MMC,
167 }, {
168 .compatible = "fsl,mpc5121-sdhc",
169 .data = (void *) MPC512X_MMC,
170 }, {
171 /* sentinel */
172 }
173};
174MODULE_DEVICE_TABLE(of, mxcmci_of_match);
175
176static inline int is_imx31_mmc(struct mxcmci_host *host)
177{
178 return host->devtype == IMX31_MMC;
179}
180
181static inline int is_mpc512x_mmc(struct mxcmci_host *host)
182{
183 return host->devtype == MPC512X_MMC;
184}
185
186static inline u32 mxcmci_readl(struct mxcmci_host *host, int reg)
187{
188 if (IS_ENABLED(CONFIG_PPC_MPC512x))
189 return ioread32be(host->base + reg);
190 else
191 return readl(host->base + reg);
192}
193
194static inline void mxcmci_writel(struct mxcmci_host *host, u32 val, int reg)
195{
196 if (IS_ENABLED(CONFIG_PPC_MPC512x))
197 iowrite32be(val, host->base + reg);
198 else
199 writel(val, host->base + reg);
200}
201
202static inline u16 mxcmci_readw(struct mxcmci_host *host, int reg)
203{
204 if (IS_ENABLED(CONFIG_PPC_MPC512x))
205 return ioread32be(host->base + reg);
206 else
207 return readw(host->base + reg);
208}
209
210static inline void mxcmci_writew(struct mxcmci_host *host, u16 val, int reg)
211{
212 if (IS_ENABLED(CONFIG_PPC_MPC512x))
213 iowrite32be(val, host->base + reg);
214 else
215 writew(val, host->base + reg);
216}
217
218static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios);
219
220static void mxcmci_set_power(struct mxcmci_host *host, unsigned int vdd)
221{
222 if (!IS_ERR(host->mmc->supply.vmmc)) {
223 if (host->power_mode == MMC_POWER_UP)
224 mmc_regulator_set_ocr(host->mmc,
225 host->mmc->supply.vmmc, vdd);
226 else if (host->power_mode == MMC_POWER_OFF)
227 mmc_regulator_set_ocr(host->mmc,
228 host->mmc->supply.vmmc, 0);
229 }
230
231 if (host->pdata && host->pdata->setpower)
232 host->pdata->setpower(mmc_dev(host->mmc), vdd);
233}
234
235static inline int mxcmci_use_dma(struct mxcmci_host *host)
236{
237 return host->do_dma;
238}
239
240static void mxcmci_softreset(struct mxcmci_host *host)
241{
242 int i;
243
244 dev_dbg(mmc_dev(host->mmc), "mxcmci_softreset\n");
245
246 /* reset sequence */
247 mxcmci_writew(host, STR_STP_CLK_RESET, MMC_REG_STR_STP_CLK);
248 mxcmci_writew(host, STR_STP_CLK_RESET | STR_STP_CLK_START_CLK,
249 MMC_REG_STR_STP_CLK);
250
251 for (i = 0; i < 8; i++)
252 mxcmci_writew(host, STR_STP_CLK_START_CLK, MMC_REG_STR_STP_CLK);
253
254 mxcmci_writew(host, 0xff, MMC_REG_RES_TO);
255}
256
257#if IS_ENABLED(CONFIG_PPC_MPC512x)
258static inline void buffer_swap32(u32 *buf, int len)
259{
260 int i;
261
262 for (i = 0; i < ((len + 3) / 4); i++) {
263 *buf = swab32(*buf);
264 buf++;
265 }
266}
267
268static void mxcmci_swap_buffers(struct mmc_data *data)
269{
270 struct scatterlist *sg;
271 int i;
272
273 for_each_sg(data->sg, sg, data->sg_len, i)
274 buffer_swap32(sg_virt(sg), sg->length);
275}
276#else
277static inline void mxcmci_swap_buffers(struct mmc_data *data) {}
278#endif
279
280static int mxcmci_setup_data(struct mxcmci_host *host, struct mmc_data *data)
281{
282 unsigned int nob = data->blocks;
283 unsigned int blksz = data->blksz;
284 unsigned int datasize = nob * blksz;
285 struct scatterlist *sg;
286 enum dma_transfer_direction slave_dirn;
287 int i, nents;
288
289 host->data = data;
290 data->bytes_xfered = 0;
291
292 mxcmci_writew(host, nob, MMC_REG_NOB);
293 mxcmci_writew(host, blksz, MMC_REG_BLK_LEN);
294 host->datasize = datasize;
295
296 if (!mxcmci_use_dma(host))
297 return 0;
298
299 for_each_sg(data->sg, sg, data->sg_len, i) {
300 if (sg->offset & 3 || sg->length & 3 || sg->length < 512) {
301 host->do_dma = 0;
302 return 0;
303 }
304 }
305
306 if (data->flags & MMC_DATA_READ) {
307 host->dma_dir = DMA_FROM_DEVICE;
308 slave_dirn = DMA_DEV_TO_MEM;
309 } else {
310 host->dma_dir = DMA_TO_DEVICE;
311 slave_dirn = DMA_MEM_TO_DEV;
312
313 mxcmci_swap_buffers(data);
314 }
315
316 nents = dma_map_sg(host->dma->device->dev, data->sg,
317 data->sg_len, host->dma_dir);
318 if (nents != data->sg_len)
319 return -EINVAL;
320
321 host->desc = dmaengine_prep_slave_sg(host->dma,
322 data->sg, data->sg_len, slave_dirn,
323 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
324
325 if (!host->desc) {
326 dma_unmap_sg(host->dma->device->dev, data->sg, data->sg_len,
327 host->dma_dir);
328 host->do_dma = 0;
329 return 0; /* Fall back to PIO */
330 }
331 wmb();
332
333 dmaengine_submit(host->desc);
334 dma_async_issue_pending(host->dma);
335
336 mod_timer(&host->watchdog, jiffies + msecs_to_jiffies(MXCMCI_TIMEOUT_MS));
337
338 return 0;
339}
340
341static void mxcmci_cmd_done(struct mxcmci_host *host, unsigned int stat);
342static void mxcmci_data_done(struct mxcmci_host *host, unsigned int stat);
343
344static void mxcmci_dma_callback(void *data)
345{
346 struct mxcmci_host *host = data;
347 u32 stat;
348
349 del_timer(&host->watchdog);
350
351 stat = mxcmci_readl(host, MMC_REG_STATUS);
352
353 dev_dbg(mmc_dev(host->mmc), "%s: 0x%08x\n", __func__, stat);
354
355 mxcmci_data_done(host, stat);
356}
357
358static int mxcmci_start_cmd(struct mxcmci_host *host, struct mmc_command *cmd,
359 unsigned int cmdat)
360{
361 u32 int_cntr = host->default_irq_mask;
362 unsigned long flags;
363
364 WARN_ON(host->cmd != NULL);
365 host->cmd = cmd;
366
367 switch (mmc_resp_type(cmd)) {
368 case MMC_RSP_R1: /* short CRC, OPCODE */
369 case MMC_RSP_R1B:/* short CRC, OPCODE, BUSY */
370 cmdat |= CMD_DAT_CONT_RESPONSE_48BIT_CRC;
371 break;
372 case MMC_RSP_R2: /* long 136 bit + CRC */
373 cmdat |= CMD_DAT_CONT_RESPONSE_136BIT;
374 break;
375 case MMC_RSP_R3: /* short */
376 cmdat |= CMD_DAT_CONT_RESPONSE_48BIT;
377 break;
378 case MMC_RSP_NONE:
379 break;
380 default:
381 dev_err(mmc_dev(host->mmc), "unhandled response type 0x%x\n",
382 mmc_resp_type(cmd));
383 cmd->error = -EINVAL;
384 return -EINVAL;
385 }
386
387 int_cntr = INT_END_CMD_RES_EN;
388
389 if (mxcmci_use_dma(host)) {
390 if (host->dma_dir == DMA_FROM_DEVICE) {
391 host->desc->callback = mxcmci_dma_callback;
392 host->desc->callback_param = host;
393 } else {
394 int_cntr |= INT_WRITE_OP_DONE_EN;
395 }
396 }
397
398 spin_lock_irqsave(&host->lock, flags);
399 if (host->use_sdio)
400 int_cntr |= INT_SDIO_IRQ_EN;
401 mxcmci_writel(host, int_cntr, MMC_REG_INT_CNTR);
402 spin_unlock_irqrestore(&host->lock, flags);
403
404 mxcmci_writew(host, cmd->opcode, MMC_REG_CMD);
405 mxcmci_writel(host, cmd->arg, MMC_REG_ARG);
406 mxcmci_writew(host, cmdat, MMC_REG_CMD_DAT_CONT);
407
408 return 0;
409}
410
411static void mxcmci_finish_request(struct mxcmci_host *host,
412 struct mmc_request *req)
413{
414 u32 int_cntr = host->default_irq_mask;
415 unsigned long flags;
416
417 spin_lock_irqsave(&host->lock, flags);
418 if (host->use_sdio)
419 int_cntr |= INT_SDIO_IRQ_EN;
420 mxcmci_writel(host, int_cntr, MMC_REG_INT_CNTR);
421 spin_unlock_irqrestore(&host->lock, flags);
422
423 host->req = NULL;
424 host->cmd = NULL;
425 host->data = NULL;
426
427 mmc_request_done(host->mmc, req);
428}
429
430static int mxcmci_finish_data(struct mxcmci_host *host, unsigned int stat)
431{
432 struct mmc_data *data = host->data;
433 int data_error;
434
435 if (mxcmci_use_dma(host)) {
436 dma_unmap_sg(host->dma->device->dev, data->sg, data->sg_len,
437 host->dma_dir);
438 mxcmci_swap_buffers(data);
439 }
440
441 if (stat & STATUS_ERR_MASK) {
442 dev_dbg(mmc_dev(host->mmc), "request failed. status: 0x%08x\n",
443 stat);
444 if (stat & STATUS_CRC_READ_ERR) {
445 dev_err(mmc_dev(host->mmc), "%s: -EILSEQ\n", __func__);
446 data->error = -EILSEQ;
447 } else if (stat & STATUS_CRC_WRITE_ERR) {
448 u32 err_code = (stat >> 9) & 0x3;
449 if (err_code == 2) { /* No CRC response */
450 dev_err(mmc_dev(host->mmc),
451 "%s: No CRC -ETIMEDOUT\n", __func__);
452 data->error = -ETIMEDOUT;
453 } else {
454 dev_err(mmc_dev(host->mmc),
455 "%s: -EILSEQ\n", __func__);
456 data->error = -EILSEQ;
457 }
458 } else if (stat & STATUS_TIME_OUT_READ) {
459 dev_err(mmc_dev(host->mmc),
460 "%s: read -ETIMEDOUT\n", __func__);
461 data->error = -ETIMEDOUT;
462 } else {
463 dev_err(mmc_dev(host->mmc), "%s: -EIO\n", __func__);
464 data->error = -EIO;
465 }
466 } else {
467 data->bytes_xfered = host->datasize;
468 }
469
470 data_error = data->error;
471
472 host->data = NULL;
473
474 return data_error;
475}
476
477static void mxcmci_read_response(struct mxcmci_host *host, unsigned int stat)
478{
479 struct mmc_command *cmd = host->cmd;
480 int i;
481 u32 a, b, c;
482
483 if (!cmd)
484 return;
485
486 if (stat & STATUS_TIME_OUT_RESP) {
487 dev_dbg(mmc_dev(host->mmc), "CMD TIMEOUT\n");
488 cmd->error = -ETIMEDOUT;
489 } else if (stat & STATUS_RESP_CRC_ERR && cmd->flags & MMC_RSP_CRC) {
490 dev_dbg(mmc_dev(host->mmc), "cmd crc error\n");
491 cmd->error = -EILSEQ;
492 }
493
494 if (cmd->flags & MMC_RSP_PRESENT) {
495 if (cmd->flags & MMC_RSP_136) {
496 for (i = 0; i < 4; i++) {
497 a = mxcmci_readw(host, MMC_REG_RES_FIFO);
498 b = mxcmci_readw(host, MMC_REG_RES_FIFO);
499 cmd->resp[i] = a << 16 | b;
500 }
501 } else {
502 a = mxcmci_readw(host, MMC_REG_RES_FIFO);
503 b = mxcmci_readw(host, MMC_REG_RES_FIFO);
504 c = mxcmci_readw(host, MMC_REG_RES_FIFO);
505 cmd->resp[0] = a << 24 | b << 8 | c >> 8;
506 }
507 }
508}
509
510static int mxcmci_poll_status(struct mxcmci_host *host, u32 mask)
511{
512 u32 stat;
513 unsigned long timeout = jiffies + HZ;
514
515 do {
516 stat = mxcmci_readl(host, MMC_REG_STATUS);
517 if (stat & STATUS_ERR_MASK)
518 return stat;
519 if (time_after(jiffies, timeout)) {
520 mxcmci_softreset(host);
521 mxcmci_set_clk_rate(host, host->clock);
522 return STATUS_TIME_OUT_READ;
523 }
524 if (stat & mask)
525 return 0;
526 cpu_relax();
527 } while (1);
528}
529
530static int mxcmci_pull(struct mxcmci_host *host, void *_buf, int bytes)
531{
532 unsigned int stat;
533 u32 *buf = _buf;
534
535 while (bytes > 3) {
536 stat = mxcmci_poll_status(host,
537 STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE);
538 if (stat)
539 return stat;
540 *buf++ = cpu_to_le32(mxcmci_readl(host, MMC_REG_BUFFER_ACCESS));
541 bytes -= 4;
542 }
543
544 if (bytes) {
545 u8 *b = (u8 *)buf;
546 u32 tmp;
547
548 stat = mxcmci_poll_status(host,
549 STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE);
550 if (stat)
551 return stat;
552 tmp = cpu_to_le32(mxcmci_readl(host, MMC_REG_BUFFER_ACCESS));
553 memcpy(b, &tmp, bytes);
554 }
555
556 return 0;
557}
558
559static int mxcmci_push(struct mxcmci_host *host, void *_buf, int bytes)
560{
561 unsigned int stat;
562 u32 *buf = _buf;
563
564 while (bytes > 3) {
565 stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
566 if (stat)
567 return stat;
568 mxcmci_writel(host, cpu_to_le32(*buf++), MMC_REG_BUFFER_ACCESS);
569 bytes -= 4;
570 }
571
572 if (bytes) {
573 u8 *b = (u8 *)buf;
574 u32 tmp;
575
576 stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
577 if (stat)
578 return stat;
579
580 memcpy(&tmp, b, bytes);
581 mxcmci_writel(host, cpu_to_le32(tmp), MMC_REG_BUFFER_ACCESS);
582 }
583
584 return mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
585}
586
587static int mxcmci_transfer_data(struct mxcmci_host *host)
588{
589 struct mmc_data *data = host->req->data;
590 struct scatterlist *sg;
591 int stat, i;
592
593 host->data = data;
594 host->datasize = 0;
595
596 if (data->flags & MMC_DATA_READ) {
597 for_each_sg(data->sg, sg, data->sg_len, i) {
598 stat = mxcmci_pull(host, sg_virt(sg), sg->length);
599 if (stat)
600 return stat;
601 host->datasize += sg->length;
602 }
603 } else {
604 for_each_sg(data->sg, sg, data->sg_len, i) {
605 stat = mxcmci_push(host, sg_virt(sg), sg->length);
606 if (stat)
607 return stat;
608 host->datasize += sg->length;
609 }
610 stat = mxcmci_poll_status(host, STATUS_WRITE_OP_DONE);
611 if (stat)
612 return stat;
613 }
614 return 0;
615}
616
617static void mxcmci_datawork(struct work_struct *work)
618{
619 struct mxcmci_host *host = container_of(work, struct mxcmci_host,
620 datawork);
621 int datastat = mxcmci_transfer_data(host);
622
623 mxcmci_writel(host, STATUS_READ_OP_DONE | STATUS_WRITE_OP_DONE,
624 MMC_REG_STATUS);
625 mxcmci_finish_data(host, datastat);
626
627 if (host->req->stop) {
628 if (mxcmci_start_cmd(host, host->req->stop, 0)) {
629 mxcmci_finish_request(host, host->req);
630 return;
631 }
632 } else {
633 mxcmci_finish_request(host, host->req);
634 }
635}
636
637static void mxcmci_data_done(struct mxcmci_host *host, unsigned int stat)
638{
639 struct mmc_request *req;
640 int data_error;
641 unsigned long flags;
642
643 spin_lock_irqsave(&host->lock, flags);
644
645 if (!host->data) {
646 spin_unlock_irqrestore(&host->lock, flags);
647 return;
648 }
649
650 if (!host->req) {
651 spin_unlock_irqrestore(&host->lock, flags);
652 return;
653 }
654
655 req = host->req;
656 if (!req->stop)
657 host->req = NULL; /* we will handle finish req below */
658
659 data_error = mxcmci_finish_data(host, stat);
660
661 spin_unlock_irqrestore(&host->lock, flags);
662
663 if (data_error)
664 return;
665
666 mxcmci_read_response(host, stat);
667 host->cmd = NULL;
668
669 if (req->stop) {
670 if (mxcmci_start_cmd(host, req->stop, 0)) {
671 mxcmci_finish_request(host, req);
672 return;
673 }
674 } else {
675 mxcmci_finish_request(host, req);
676 }
677}
678
679static void mxcmci_cmd_done(struct mxcmci_host *host, unsigned int stat)
680{
681 mxcmci_read_response(host, stat);
682 host->cmd = NULL;
683
684 if (!host->data && host->req) {
685 mxcmci_finish_request(host, host->req);
686 return;
687 }
688
689 /* For the DMA case the DMA engine handles the data transfer
690 * automatically. For non DMA we have to do it ourselves.
691 * Don't do it in interrupt context though.
692 */
693 if (!mxcmci_use_dma(host) && host->data)
694 schedule_work(&host->datawork);
695
696}
697
698static irqreturn_t mxcmci_irq(int irq, void *devid)
699{
700 struct mxcmci_host *host = devid;
701 bool sdio_irq;
702 u32 stat;
703
704 stat = mxcmci_readl(host, MMC_REG_STATUS);
705 mxcmci_writel(host,
706 stat & ~(STATUS_SDIO_INT_ACTIVE | STATUS_DATA_TRANS_DONE |
707 STATUS_WRITE_OP_DONE),
708 MMC_REG_STATUS);
709
710 dev_dbg(mmc_dev(host->mmc), "%s: 0x%08x\n", __func__, stat);
711
712 spin_lock(&host->lock);
713 sdio_irq = (stat & STATUS_SDIO_INT_ACTIVE) && host->use_sdio;
714 spin_unlock(&host->lock);
715
716 if (mxcmci_use_dma(host) && (stat & (STATUS_WRITE_OP_DONE)))
717 mxcmci_writel(host, STATUS_WRITE_OP_DONE, MMC_REG_STATUS);
718
719 if (sdio_irq) {
720 mxcmci_writel(host, STATUS_SDIO_INT_ACTIVE, MMC_REG_STATUS);
721 mmc_signal_sdio_irq(host->mmc);
722 }
723
724 if (stat & STATUS_END_CMD_RESP)
725 mxcmci_cmd_done(host, stat);
726
727 if (mxcmci_use_dma(host) && (stat & STATUS_WRITE_OP_DONE)) {
728 del_timer(&host->watchdog);
729 mxcmci_data_done(host, stat);
730 }
731
732 if (host->default_irq_mask &&
733 (stat & (STATUS_CARD_INSERTION | STATUS_CARD_REMOVAL)))
734 mmc_detect_change(host->mmc, msecs_to_jiffies(200));
735
736 return IRQ_HANDLED;
737}
738
739static void mxcmci_request(struct mmc_host *mmc, struct mmc_request *req)
740{
741 struct mxcmci_host *host = mmc_priv(mmc);
742 unsigned int cmdat = host->cmdat;
743 int error;
744
745 WARN_ON(host->req != NULL);
746
747 host->req = req;
748 host->cmdat &= ~CMD_DAT_CONT_INIT;
749
750 if (host->dma)
751 host->do_dma = 1;
752
753 if (req->data) {
754 error = mxcmci_setup_data(host, req->data);
755 if (error) {
756 req->cmd->error = error;
757 goto out;
758 }
759
760
761 cmdat |= CMD_DAT_CONT_DATA_ENABLE;
762
763 if (req->data->flags & MMC_DATA_WRITE)
764 cmdat |= CMD_DAT_CONT_WRITE;
765 }
766
767 error = mxcmci_start_cmd(host, req->cmd, cmdat);
768
769out:
770 if (error)
771 mxcmci_finish_request(host, req);
772}
773
774static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios)
775{
776 unsigned int divider;
777 int prescaler = 0;
778 unsigned int clk_in = clk_get_rate(host->clk_per);
779
780 while (prescaler <= 0x800) {
781 for (divider = 1; divider <= 0xF; divider++) {
782 int x;
783
784 x = (clk_in / (divider + 1));
785
786 if (prescaler)
787 x /= (prescaler * 2);
788
789 if (x <= clk_ios)
790 break;
791 }
792 if (divider < 0x10)
793 break;
794
795 if (prescaler == 0)
796 prescaler = 1;
797 else
798 prescaler <<= 1;
799 }
800
801 mxcmci_writew(host, (prescaler << 4) | divider, MMC_REG_CLK_RATE);
802
803 dev_dbg(mmc_dev(host->mmc), "scaler: %d divider: %d in: %d out: %d\n",
804 prescaler, divider, clk_in, clk_ios);
805}
806
807static int mxcmci_setup_dma(struct mmc_host *mmc)
808{
809 struct mxcmci_host *host = mmc_priv(mmc);
810 struct dma_slave_config *config = &host->dma_slave_config;
811
812 config->dst_addr = host->phys_base + MMC_REG_BUFFER_ACCESS;
813 config->src_addr = host->phys_base + MMC_REG_BUFFER_ACCESS;
814 config->dst_addr_width = 4;
815 config->src_addr_width = 4;
816 config->dst_maxburst = host->burstlen;
817 config->src_maxburst = host->burstlen;
818 config->device_fc = false;
819
820 return dmaengine_slave_config(host->dma, config);
821}
822
823static void mxcmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
824{
825 struct mxcmci_host *host = mmc_priv(mmc);
826 int burstlen, ret;
827
828 /*
829 * use burstlen of 64 (16 words) in 4 bit mode (--> reg value 0)
830 * use burstlen of 16 (4 words) in 1 bit mode (--> reg value 16)
831 */
832 if (ios->bus_width == MMC_BUS_WIDTH_4)
833 burstlen = 16;
834 else
835 burstlen = 4;
836
837 if (mxcmci_use_dma(host) && burstlen != host->burstlen) {
838 host->burstlen = burstlen;
839 ret = mxcmci_setup_dma(mmc);
840 if (ret) {
841 dev_err(mmc_dev(host->mmc),
842 "failed to config DMA channel. Falling back to PIO\n");
843 dma_release_channel(host->dma);
844 host->do_dma = 0;
845 host->dma = NULL;
846 }
847 }
848
849 if (ios->bus_width == MMC_BUS_WIDTH_4)
850 host->cmdat |= CMD_DAT_CONT_BUS_WIDTH_4;
851 else
852 host->cmdat &= ~CMD_DAT_CONT_BUS_WIDTH_4;
853
854 if (host->power_mode != ios->power_mode) {
855 host->power_mode = ios->power_mode;
856 mxcmci_set_power(host, ios->vdd);
857
858 if (ios->power_mode == MMC_POWER_ON)
859 host->cmdat |= CMD_DAT_CONT_INIT;
860 }
861
862 if (ios->clock) {
863 mxcmci_set_clk_rate(host, ios->clock);
864 mxcmci_writew(host, STR_STP_CLK_START_CLK, MMC_REG_STR_STP_CLK);
865 } else {
866 mxcmci_writew(host, STR_STP_CLK_STOP_CLK, MMC_REG_STR_STP_CLK);
867 }
868
869 host->clock = ios->clock;
870}
871
872static irqreturn_t mxcmci_detect_irq(int irq, void *data)
873{
874 struct mmc_host *mmc = data;
875
876 dev_dbg(mmc_dev(mmc), "%s\n", __func__);
877
878 mmc_detect_change(mmc, msecs_to_jiffies(250));
879 return IRQ_HANDLED;
880}
881
882static int mxcmci_get_ro(struct mmc_host *mmc)
883{
884 struct mxcmci_host *host = mmc_priv(mmc);
885
886 if (host->pdata && host->pdata->get_ro)
887 return !!host->pdata->get_ro(mmc_dev(mmc));
888 /*
889 * If board doesn't support read only detection (no mmc_gpio
890 * context or gpio is invalid), then let the mmc core decide
891 * what to do.
892 */
893 return mmc_gpio_get_ro(mmc);
894}
895
896static void mxcmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
897{
898 struct mxcmci_host *host = mmc_priv(mmc);
899 unsigned long flags;
900 u32 int_cntr;
901
902 spin_lock_irqsave(&host->lock, flags);
903 host->use_sdio = enable;
904 int_cntr = mxcmci_readl(host, MMC_REG_INT_CNTR);
905
906 if (enable)
907 int_cntr |= INT_SDIO_IRQ_EN;
908 else
909 int_cntr &= ~INT_SDIO_IRQ_EN;
910
911 mxcmci_writel(host, int_cntr, MMC_REG_INT_CNTR);
912 spin_unlock_irqrestore(&host->lock, flags);
913}
914
915static void mxcmci_init_card(struct mmc_host *host, struct mmc_card *card)
916{
917 struct mxcmci_host *mxcmci = mmc_priv(host);
918
919 /*
920 * MX3 SoCs have a silicon bug which corrupts CRC calculation of
921 * multi-block transfers when connected SDIO peripheral doesn't
922 * drive the BUSY line as required by the specs.
923 * One way to prevent this is to only allow 1-bit transfers.
924 */
925
926 if (is_imx31_mmc(mxcmci) && mmc_card_sdio(card))
927 host->caps &= ~MMC_CAP_4_BIT_DATA;
928 else
929 host->caps |= MMC_CAP_4_BIT_DATA;
930}
931
932static bool filter(struct dma_chan *chan, void *param)
933{
934 struct mxcmci_host *host = param;
935
936 if (!imx_dma_is_general_purpose(chan))
937 return false;
938
939 chan->private = &host->dma_data;
940
941 return true;
942}
943
944static void mxcmci_watchdog(struct timer_list *t)
945{
946 struct mxcmci_host *host = from_timer(host, t, watchdog);
947 struct mmc_request *req = host->req;
948 unsigned int stat = mxcmci_readl(host, MMC_REG_STATUS);
949
950 if (host->dma_dir == DMA_FROM_DEVICE) {
951 dmaengine_terminate_all(host->dma);
952 dev_err(mmc_dev(host->mmc),
953 "%s: read time out (status = 0x%08x)\n",
954 __func__, stat);
955 } else {
956 dev_err(mmc_dev(host->mmc),
957 "%s: write time out (status = 0x%08x)\n",
958 __func__, stat);
959 mxcmci_softreset(host);
960 }
961
962 /* Mark transfer as erroneus and inform the upper layers */
963
964 if (host->data)
965 host->data->error = -ETIMEDOUT;
966 host->req = NULL;
967 host->cmd = NULL;
968 host->data = NULL;
969 mmc_request_done(host->mmc, req);
970}
971
972static const struct mmc_host_ops mxcmci_ops = {
973 .request = mxcmci_request,
974 .set_ios = mxcmci_set_ios,
975 .get_ro = mxcmci_get_ro,
976 .enable_sdio_irq = mxcmci_enable_sdio_irq,
977 .init_card = mxcmci_init_card,
978};
979
980static int mxcmci_probe(struct platform_device *pdev)
981{
982 struct mmc_host *mmc;
983 struct mxcmci_host *host;
984 struct resource *res;
985 int ret = 0, irq;
986 bool dat3_card_detect = false;
987 dma_cap_mask_t mask;
988 struct imxmmc_platform_data *pdata = pdev->dev.platform_data;
989
990 pr_info("i.MX/MPC512x SDHC driver\n");
991
992 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
993 irq = platform_get_irq(pdev, 0);
994 if (irq < 0)
995 return irq;
996
997 mmc = mmc_alloc_host(sizeof(*host), &pdev->dev);
998 if (!mmc)
999 return -ENOMEM;
1000
1001 host = mmc_priv(mmc);
1002
1003 host->base = devm_ioremap_resource(&pdev->dev, res);
1004 if (IS_ERR(host->base)) {
1005 ret = PTR_ERR(host->base);
1006 goto out_free;
1007 }
1008
1009 host->phys_base = res->start;
1010
1011 ret = mmc_of_parse(mmc);
1012 if (ret)
1013 goto out_free;
1014 mmc->ops = &mxcmci_ops;
1015
1016 /* For devicetree parsing, the bus width is read from devicetree */
1017 if (pdata)
1018 mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
1019 else
1020 mmc->caps |= MMC_CAP_SDIO_IRQ;
1021
1022 /* MMC core transfer sizes tunable parameters */
1023 mmc->max_blk_size = 2048;
1024 mmc->max_blk_count = 65535;
1025 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1026 mmc->max_seg_size = mmc->max_req_size;
1027
1028 host->devtype = (uintptr_t)of_device_get_match_data(&pdev->dev);
1029
1030 /* adjust max_segs after devtype detection */
1031 if (!is_mpc512x_mmc(host))
1032 mmc->max_segs = 64;
1033
1034 host->mmc = mmc;
1035 host->pdata = pdata;
1036 spin_lock_init(&host->lock);
1037
1038 if (pdata)
1039 dat3_card_detect = pdata->dat3_card_detect;
1040 else if (mmc_card_is_removable(mmc)
1041 && !of_property_read_bool(pdev->dev.of_node, "cd-gpios"))
1042 dat3_card_detect = true;
1043
1044 ret = mmc_regulator_get_supply(mmc);
1045 if (ret)
1046 goto out_free;
1047
1048 if (!mmc->ocr_avail) {
1049 if (pdata && pdata->ocr_avail)
1050 mmc->ocr_avail = pdata->ocr_avail;
1051 else
1052 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1053 }
1054
1055 if (dat3_card_detect)
1056 host->default_irq_mask =
1057 INT_CARD_INSERTION_EN | INT_CARD_REMOVAL_EN;
1058 else
1059 host->default_irq_mask = 0;
1060
1061 host->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
1062 if (IS_ERR(host->clk_ipg)) {
1063 ret = PTR_ERR(host->clk_ipg);
1064 goto out_free;
1065 }
1066
1067 host->clk_per = devm_clk_get(&pdev->dev, "per");
1068 if (IS_ERR(host->clk_per)) {
1069 ret = PTR_ERR(host->clk_per);
1070 goto out_free;
1071 }
1072
1073 ret = clk_prepare_enable(host->clk_per);
1074 if (ret)
1075 goto out_free;
1076
1077 ret = clk_prepare_enable(host->clk_ipg);
1078 if (ret)
1079 goto out_clk_per_put;
1080
1081 mxcmci_softreset(host);
1082
1083 host->rev_no = mxcmci_readw(host, MMC_REG_REV_NO);
1084 if (host->rev_no != 0x400) {
1085 ret = -ENODEV;
1086 dev_err(mmc_dev(host->mmc), "wrong rev.no. 0x%08x. aborting.\n",
1087 host->rev_no);
1088 goto out_clk_put;
1089 }
1090
1091 mmc->f_min = clk_get_rate(host->clk_per) >> 16;
1092 mmc->f_max = clk_get_rate(host->clk_per) >> 1;
1093
1094 /* recommended in data sheet */
1095 mxcmci_writew(host, 0x2db4, MMC_REG_READ_TO);
1096
1097 mxcmci_writel(host, host->default_irq_mask, MMC_REG_INT_CNTR);
1098
1099 if (!host->pdata) {
1100 host->dma = dma_request_chan(&pdev->dev, "rx-tx");
1101 if (IS_ERR(host->dma)) {
1102 if (PTR_ERR(host->dma) == -EPROBE_DEFER) {
1103 ret = -EPROBE_DEFER;
1104 goto out_clk_put;
1105 }
1106
1107 /* Ignore errors to fall back to PIO mode */
1108 host->dma = NULL;
1109 }
1110 } else {
1111 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
1112 if (res) {
1113 host->dmareq = res->start;
1114 host->dma_data.peripheral_type = IMX_DMATYPE_SDHC;
1115 host->dma_data.priority = DMA_PRIO_LOW;
1116 host->dma_data.dma_request = host->dmareq;
1117 dma_cap_zero(mask);
1118 dma_cap_set(DMA_SLAVE, mask);
1119 host->dma = dma_request_channel(mask, filter, host);
1120 }
1121 }
1122 if (host->dma)
1123 mmc->max_seg_size = dma_get_max_seg_size(
1124 host->dma->device->dev);
1125 else
1126 dev_info(mmc_dev(host->mmc), "dma not available. Using PIO\n");
1127
1128 INIT_WORK(&host->datawork, mxcmci_datawork);
1129
1130 ret = devm_request_irq(&pdev->dev, irq, mxcmci_irq, 0,
1131 dev_name(&pdev->dev), host);
1132 if (ret)
1133 goto out_free_dma;
1134
1135 platform_set_drvdata(pdev, mmc);
1136
1137 if (host->pdata && host->pdata->init) {
1138 ret = host->pdata->init(&pdev->dev, mxcmci_detect_irq,
1139 host->mmc);
1140 if (ret)
1141 goto out_free_dma;
1142 }
1143
1144 timer_setup(&host->watchdog, mxcmci_watchdog, 0);
1145
1146 ret = mmc_add_host(mmc);
1147 if (ret)
1148 goto out_free_dma;
1149
1150 return 0;
1151
1152out_free_dma:
1153 if (host->dma)
1154 dma_release_channel(host->dma);
1155
1156out_clk_put:
1157 clk_disable_unprepare(host->clk_ipg);
1158out_clk_per_put:
1159 clk_disable_unprepare(host->clk_per);
1160
1161out_free:
1162 mmc_free_host(mmc);
1163
1164 return ret;
1165}
1166
1167static int mxcmci_remove(struct platform_device *pdev)
1168{
1169 struct mmc_host *mmc = platform_get_drvdata(pdev);
1170 struct mxcmci_host *host = mmc_priv(mmc);
1171
1172 mmc_remove_host(mmc);
1173
1174 if (host->pdata && host->pdata->exit)
1175 host->pdata->exit(&pdev->dev, mmc);
1176
1177 if (host->dma)
1178 dma_release_channel(host->dma);
1179
1180 clk_disable_unprepare(host->clk_per);
1181 clk_disable_unprepare(host->clk_ipg);
1182
1183 mmc_free_host(mmc);
1184
1185 return 0;
1186}
1187
1188static int mxcmci_suspend(struct device *dev)
1189{
1190 struct mmc_host *mmc = dev_get_drvdata(dev);
1191 struct mxcmci_host *host = mmc_priv(mmc);
1192
1193 clk_disable_unprepare(host->clk_per);
1194 clk_disable_unprepare(host->clk_ipg);
1195 return 0;
1196}
1197
1198static int mxcmci_resume(struct device *dev)
1199{
1200 struct mmc_host *mmc = dev_get_drvdata(dev);
1201 struct mxcmci_host *host = mmc_priv(mmc);
1202 int ret;
1203
1204 ret = clk_prepare_enable(host->clk_per);
1205 if (ret)
1206 return ret;
1207
1208 ret = clk_prepare_enable(host->clk_ipg);
1209 if (ret)
1210 clk_disable_unprepare(host->clk_per);
1211
1212 return ret;
1213}
1214
1215static DEFINE_SIMPLE_DEV_PM_OPS(mxcmci_pm_ops, mxcmci_suspend, mxcmci_resume);
1216
1217static struct platform_driver mxcmci_driver = {
1218 .probe = mxcmci_probe,
1219 .remove = mxcmci_remove,
1220 .driver = {
1221 .name = DRIVER_NAME,
1222 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1223 .pm = pm_sleep_ptr(&mxcmci_pm_ops),
1224 .of_match_table = mxcmci_of_match,
1225 }
1226};
1227
1228module_platform_driver(mxcmci_driver);
1229
1230MODULE_DESCRIPTION("i.MX Multimedia Card Interface Driver");
1231MODULE_AUTHOR("Sascha Hauer, Pengutronix");
1232MODULE_LICENSE("GPL");
1233MODULE_ALIAS("platform:mxc-mmc");
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
119enum mxcmci_type {
120 IMX21_MMC,
121 IMX31_MMC,
122 MPC512X_MMC,
123};
124
125struct 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
168static 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};
182MODULE_DEVICE_TABLE(platform, mxcmci_devtype);
183
184static 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};
198MODULE_DEVICE_TABLE(of, mxcmci_of_match);
199
200static inline int is_imx31_mmc(struct mxcmci_host *host)
201{
202 return host->devtype == IMX31_MMC;
203}
204
205static inline int is_mpc512x_mmc(struct mxcmci_host *host)
206{
207 return host->devtype == MPC512X_MMC;
208}
209
210static 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
218static 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
226static 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
234static 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
242static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios);
243
244static 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
266static 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
281static inline int mxcmci_use_dma(struct mxcmci_host *host)
282{
283 return host->do_dma;
284}
285
286static 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}
302static int mxcmci_setup_dma(struct mmc_host *mmc);
303
304#if IS_ENABLED(CONFIG_PPC_MPC512x)
305static 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
315static 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
324static inline void mxcmci_swap_buffers(struct mmc_data *data) {}
325#endif
326
327static 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
391static void mxcmci_cmd_done(struct mxcmci_host *host, unsigned int stat);
392static void mxcmci_data_done(struct mxcmci_host *host, unsigned int stat);
393
394static 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
412static 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
465static 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
484static 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
531static 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
564static 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
584static 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
613static 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
645static 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
675static 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
695static 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
734static 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
753static 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
798static 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
828out:
829 if (error)
830 mxcmci_finish_request(host, req);
831}
832
833static 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
866static 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
882static 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
931static 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
941static 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
955static 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
974static 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
991static 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
1003static 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
1032static 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
1040static 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
1202out_free_irq:
1203 free_irq(host->irq, host);
1204out_free_dma:
1205 if (host->dma)
1206 dma_release_channel(host->dma);
1207out_clk_put:
1208 clk_disable_unprepare(host->clk_per);
1209 clk_disable_unprepare(host->clk_ipg);
1210out_iounmap:
1211 iounmap(host->base);
1212out_free:
1213 mmc_free_host(mmc);
1214out_release_mem:
1215 release_mem_region(iores->start, resource_size(iores));
1216 return ret;
1217}
1218
1219static 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
1249static 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
1259static 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
1269static const struct dev_pm_ops mxcmci_pm_ops = {
1270 .suspend = mxcmci_suspend,
1271 .resume = mxcmci_resume,
1272};
1273#endif
1274
1275static 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
1289module_platform_driver(mxcmci_driver);
1290
1291MODULE_DESCRIPTION("i.MX Multimedia Card Interface Driver");
1292MODULE_AUTHOR("Sascha Hauer, Pengutronix");
1293MODULE_LICENSE("GPL");
1294MODULE_ALIAS("platform:mxc-mmc");