2 * linux/drivers/mmc/host/mxcmmc.c - Freescale i.MX MMCI driver
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.
9 * Copyright (C) 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
10 * Copyright (C) 2006 Pavel Pisa, PiKRON <ppisa@pikron.com>
12 * derived from pxamci.c by Russell King
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.
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>
33 #include <linux/gpio.h>
34 #include <linux/regulator/consumer.h>
35 #include <linux/dmaengine.h>
39 #include <asm/sizes.h>
44 #define DRIVER_NAME "mxc-mmc"
46 #define MMC_REG_STR_STP_CLK 0x00
47 #define MMC_REG_STATUS 0x04
48 #define MMC_REG_CLK_RATE 0x08
49 #define MMC_REG_CMD_DAT_CONT 0x0C
50 #define MMC_REG_RES_TO 0x10
51 #define MMC_REG_READ_TO 0x14
52 #define MMC_REG_BLK_LEN 0x18
53 #define MMC_REG_NOB 0x1C
54 #define MMC_REG_REV_NO 0x20
55 #define MMC_REG_INT_CNTR 0x24
56 #define MMC_REG_CMD 0x28
57 #define MMC_REG_ARG 0x2C
58 #define MMC_REG_RES_FIFO 0x34
59 #define MMC_REG_BUFFER_ACCESS 0x38
61 #define STR_STP_CLK_RESET (1 << 3)
62 #define STR_STP_CLK_START_CLK (1 << 1)
63 #define STR_STP_CLK_STOP_CLK (1 << 0)
65 #define STATUS_CARD_INSERTION (1 << 31)
66 #define STATUS_CARD_REMOVAL (1 << 30)
67 #define STATUS_YBUF_EMPTY (1 << 29)
68 #define STATUS_XBUF_EMPTY (1 << 28)
69 #define STATUS_YBUF_FULL (1 << 27)
70 #define STATUS_XBUF_FULL (1 << 26)
71 #define STATUS_BUF_UND_RUN (1 << 25)
72 #define STATUS_BUF_OVFL (1 << 24)
73 #define STATUS_SDIO_INT_ACTIVE (1 << 14)
74 #define STATUS_END_CMD_RESP (1 << 13)
75 #define STATUS_WRITE_OP_DONE (1 << 12)
76 #define STATUS_DATA_TRANS_DONE (1 << 11)
77 #define STATUS_READ_OP_DONE (1 << 11)
78 #define STATUS_WR_CRC_ERROR_CODE_MASK (3 << 10)
79 #define STATUS_CARD_BUS_CLK_RUN (1 << 8)
80 #define STATUS_BUF_READ_RDY (1 << 7)
81 #define STATUS_BUF_WRITE_RDY (1 << 6)
82 #define STATUS_RESP_CRC_ERR (1 << 5)
83 #define STATUS_CRC_READ_ERR (1 << 3)
84 #define STATUS_CRC_WRITE_ERR (1 << 2)
85 #define STATUS_TIME_OUT_RESP (1 << 1)
86 #define STATUS_TIME_OUT_READ (1 << 0)
87 #define STATUS_ERR_MASK 0x2f
89 #define CMD_DAT_CONT_CMD_RESP_LONG_OFF (1 << 12)
90 #define CMD_DAT_CONT_STOP_READWAIT (1 << 11)
91 #define CMD_DAT_CONT_START_READWAIT (1 << 10)
92 #define CMD_DAT_CONT_BUS_WIDTH_4 (2 << 8)
93 #define CMD_DAT_CONT_INIT (1 << 7)
94 #define CMD_DAT_CONT_WRITE (1 << 4)
95 #define CMD_DAT_CONT_DATA_ENABLE (1 << 3)
96 #define CMD_DAT_CONT_RESPONSE_48BIT_CRC (1 << 0)
97 #define CMD_DAT_CONT_RESPONSE_136BIT (2 << 0)
98 #define CMD_DAT_CONT_RESPONSE_48BIT (3 << 0)
100 #define INT_SDIO_INT_WKP_EN (1 << 18)
101 #define INT_CARD_INSERTION_WKP_EN (1 << 17)
102 #define INT_CARD_REMOVAL_WKP_EN (1 << 16)
103 #define INT_CARD_INSERTION_EN (1 << 15)
104 #define INT_CARD_REMOVAL_EN (1 << 14)
105 #define INT_SDIO_IRQ_EN (1 << 13)
106 #define INT_DAT0_EN (1 << 12)
107 #define INT_BUF_READ_EN (1 << 4)
108 #define INT_BUF_WRITE_EN (1 << 3)
109 #define INT_END_CMD_RES_EN (1 << 2)
110 #define INT_WRITE_OP_DONE_EN (1 << 1)
111 #define INT_READ_OP_EN (1 << 0)
114 struct mmc_host *mmc;
115 struct resource *res;
119 struct dma_chan *dma;
120 struct dma_async_tx_descriptor *desc;
122 int default_irq_mask;
124 unsigned int power_mode;
125 struct imxmmc_platform_data *pdata;
127 struct mmc_request *req;
128 struct mmc_command *cmd;
129 struct mmc_data *data;
131 unsigned int datasize;
132 unsigned int dma_dir;
141 struct work_struct datawork;
144 struct regulator *vcc;
148 struct dma_slave_config dma_slave_config;
149 struct imx_dma_data dma_data;
152 static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios);
154 static inline void mxcmci_init_ocr(struct mxcmci_host *host)
156 host->vcc = regulator_get(mmc_dev(host->mmc), "vmmc");
158 if (IS_ERR(host->vcc)) {
161 host->mmc->ocr_avail = mmc_regulator_get_ocrmask(host->vcc);
162 if (host->pdata && host->pdata->ocr_avail)
163 dev_warn(mmc_dev(host->mmc),
164 "pdata->ocr_avail will not be used\n");
167 if (host->vcc == NULL) {
168 /* fall-back to platform data */
169 if (host->pdata && host->pdata->ocr_avail)
170 host->mmc->ocr_avail = host->pdata->ocr_avail;
172 host->mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
176 static inline void mxcmci_set_power(struct mxcmci_host *host,
177 unsigned char power_mode,
181 if (power_mode == MMC_POWER_UP)
182 mmc_regulator_set_ocr(host->mmc, host->vcc, vdd);
183 else if (power_mode == MMC_POWER_OFF)
184 mmc_regulator_set_ocr(host->mmc, host->vcc, 0);
187 if (host->pdata && host->pdata->setpower)
188 host->pdata->setpower(mmc_dev(host->mmc), vdd);
191 static inline int mxcmci_use_dma(struct mxcmci_host *host)
196 static void mxcmci_softreset(struct mxcmci_host *host)
200 dev_dbg(mmc_dev(host->mmc), "mxcmci_softreset\n");
203 writew(STR_STP_CLK_RESET, host->base + MMC_REG_STR_STP_CLK);
204 writew(STR_STP_CLK_RESET | STR_STP_CLK_START_CLK,
205 host->base + MMC_REG_STR_STP_CLK);
207 for (i = 0; i < 8; i++)
208 writew(STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK);
210 writew(0xff, host->base + MMC_REG_RES_TO);
212 static int mxcmci_setup_dma(struct mmc_host *mmc);
214 static int mxcmci_setup_data(struct mxcmci_host *host, struct mmc_data *data)
216 unsigned int nob = data->blocks;
217 unsigned int blksz = data->blksz;
218 unsigned int datasize = nob * blksz;
219 struct scatterlist *sg;
222 if (data->flags & MMC_DATA_STREAM)
226 data->bytes_xfered = 0;
228 writew(nob, host->base + MMC_REG_NOB);
229 writew(blksz, host->base + MMC_REG_BLK_LEN);
230 host->datasize = datasize;
232 if (!mxcmci_use_dma(host))
235 for_each_sg(data->sg, sg, data->sg_len, i) {
236 if (sg->offset & 3 || sg->length & 3) {
242 if (data->flags & MMC_DATA_READ)
243 host->dma_dir = DMA_FROM_DEVICE;
245 host->dma_dir = DMA_TO_DEVICE;
247 nents = dma_map_sg(host->dma->device->dev, data->sg,
248 data->sg_len, host->dma_dir);
249 if (nents != data->sg_len)
252 host->desc = host->dma->device->device_prep_slave_sg(host->dma,
253 data->sg, data->sg_len, host->dma_dir,
254 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
257 dma_unmap_sg(host->dma->device->dev, data->sg, data->sg_len,
260 return 0; /* Fall back to PIO */
264 dmaengine_submit(host->desc);
269 static int mxcmci_start_cmd(struct mxcmci_host *host, struct mmc_command *cmd,
272 u32 int_cntr = host->default_irq_mask;
275 WARN_ON(host->cmd != NULL);
278 switch (mmc_resp_type(cmd)) {
279 case MMC_RSP_R1: /* short CRC, OPCODE */
280 case MMC_RSP_R1B:/* short CRC, OPCODE, BUSY */
281 cmdat |= CMD_DAT_CONT_RESPONSE_48BIT_CRC;
283 case MMC_RSP_R2: /* long 136 bit + CRC */
284 cmdat |= CMD_DAT_CONT_RESPONSE_136BIT;
286 case MMC_RSP_R3: /* short */
287 cmdat |= CMD_DAT_CONT_RESPONSE_48BIT;
292 dev_err(mmc_dev(host->mmc), "unhandled response type 0x%x\n",
294 cmd->error = -EINVAL;
298 int_cntr = INT_END_CMD_RES_EN;
300 if (mxcmci_use_dma(host))
301 int_cntr |= INT_READ_OP_EN | INT_WRITE_OP_DONE_EN;
303 spin_lock_irqsave(&host->lock, flags);
305 int_cntr |= INT_SDIO_IRQ_EN;
306 writel(int_cntr, host->base + MMC_REG_INT_CNTR);
307 spin_unlock_irqrestore(&host->lock, flags);
309 writew(cmd->opcode, host->base + MMC_REG_CMD);
310 writel(cmd->arg, host->base + MMC_REG_ARG);
311 writew(cmdat, host->base + MMC_REG_CMD_DAT_CONT);
316 static void mxcmci_finish_request(struct mxcmci_host *host,
317 struct mmc_request *req)
319 u32 int_cntr = host->default_irq_mask;
322 spin_lock_irqsave(&host->lock, flags);
324 int_cntr |= INT_SDIO_IRQ_EN;
325 writel(int_cntr, host->base + MMC_REG_INT_CNTR);
326 spin_unlock_irqrestore(&host->lock, flags);
332 mmc_request_done(host->mmc, req);
335 static int mxcmci_finish_data(struct mxcmci_host *host, unsigned int stat)
337 struct mmc_data *data = host->data;
340 if (mxcmci_use_dma(host)) {
341 dmaengine_terminate_all(host->dma);
342 dma_unmap_sg(host->dma->device->dev, data->sg, data->sg_len,
346 if (stat & STATUS_ERR_MASK) {
347 dev_dbg(mmc_dev(host->mmc), "request failed. status: 0x%08x\n",
349 if (stat & STATUS_CRC_READ_ERR) {
350 dev_err(mmc_dev(host->mmc), "%s: -EILSEQ\n", __func__);
351 data->error = -EILSEQ;
352 } else if (stat & STATUS_CRC_WRITE_ERR) {
353 u32 err_code = (stat >> 9) & 0x3;
354 if (err_code == 2) { /* No CRC response */
355 dev_err(mmc_dev(host->mmc),
356 "%s: No CRC -ETIMEDOUT\n", __func__);
357 data->error = -ETIMEDOUT;
359 dev_err(mmc_dev(host->mmc),
360 "%s: -EILSEQ\n", __func__);
361 data->error = -EILSEQ;
363 } else if (stat & STATUS_TIME_OUT_READ) {
364 dev_err(mmc_dev(host->mmc),
365 "%s: read -ETIMEDOUT\n", __func__);
366 data->error = -ETIMEDOUT;
368 dev_err(mmc_dev(host->mmc), "%s: -EIO\n", __func__);
372 data->bytes_xfered = host->datasize;
375 data_error = data->error;
382 static void mxcmci_read_response(struct mxcmci_host *host, unsigned int stat)
384 struct mmc_command *cmd = host->cmd;
391 if (stat & STATUS_TIME_OUT_RESP) {
392 dev_dbg(mmc_dev(host->mmc), "CMD TIMEOUT\n");
393 cmd->error = -ETIMEDOUT;
394 } else if (stat & STATUS_RESP_CRC_ERR && cmd->flags & MMC_RSP_CRC) {
395 dev_dbg(mmc_dev(host->mmc), "cmd crc error\n");
396 cmd->error = -EILSEQ;
399 if (cmd->flags & MMC_RSP_PRESENT) {
400 if (cmd->flags & MMC_RSP_136) {
401 for (i = 0; i < 4; i++) {
402 a = readw(host->base + MMC_REG_RES_FIFO);
403 b = readw(host->base + MMC_REG_RES_FIFO);
404 cmd->resp[i] = a << 16 | b;
407 a = readw(host->base + MMC_REG_RES_FIFO);
408 b = readw(host->base + MMC_REG_RES_FIFO);
409 c = readw(host->base + MMC_REG_RES_FIFO);
410 cmd->resp[0] = a << 24 | b << 8 | c >> 8;
415 static int mxcmci_poll_status(struct mxcmci_host *host, u32 mask)
418 unsigned long timeout = jiffies + HZ;
421 stat = readl(host->base + MMC_REG_STATUS);
422 if (stat & STATUS_ERR_MASK)
424 if (time_after(jiffies, timeout)) {
425 mxcmci_softreset(host);
426 mxcmci_set_clk_rate(host, host->clock);
427 return STATUS_TIME_OUT_READ;
435 static int mxcmci_pull(struct mxcmci_host *host, void *_buf, int bytes)
441 stat = mxcmci_poll_status(host,
442 STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE);
445 *buf++ = readl(host->base + MMC_REG_BUFFER_ACCESS);
453 stat = mxcmci_poll_status(host,
454 STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE);
457 tmp = readl(host->base + MMC_REG_BUFFER_ACCESS);
458 memcpy(b, &tmp, bytes);
464 static int mxcmci_push(struct mxcmci_host *host, void *_buf, int bytes)
470 stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
473 writel(*buf++, host->base + MMC_REG_BUFFER_ACCESS);
481 stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
485 memcpy(&tmp, b, bytes);
486 writel(tmp, host->base + MMC_REG_BUFFER_ACCESS);
489 stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
496 static int mxcmci_transfer_data(struct mxcmci_host *host)
498 struct mmc_data *data = host->req->data;
499 struct scatterlist *sg;
505 if (data->flags & MMC_DATA_READ) {
506 for_each_sg(data->sg, sg, data->sg_len, i) {
507 stat = mxcmci_pull(host, sg_virt(sg), sg->length);
510 host->datasize += sg->length;
513 for_each_sg(data->sg, sg, data->sg_len, i) {
514 stat = mxcmci_push(host, sg_virt(sg), sg->length);
517 host->datasize += sg->length;
519 stat = mxcmci_poll_status(host, STATUS_WRITE_OP_DONE);
526 static void mxcmci_datawork(struct work_struct *work)
528 struct mxcmci_host *host = container_of(work, struct mxcmci_host,
530 int datastat = mxcmci_transfer_data(host);
532 writel(STATUS_READ_OP_DONE | STATUS_WRITE_OP_DONE,
533 host->base + MMC_REG_STATUS);
534 mxcmci_finish_data(host, datastat);
536 if (host->req->stop) {
537 if (mxcmci_start_cmd(host, host->req->stop, 0)) {
538 mxcmci_finish_request(host, host->req);
542 mxcmci_finish_request(host, host->req);
546 static void mxcmci_data_done(struct mxcmci_host *host, unsigned int stat)
548 struct mmc_data *data = host->data;
554 data_error = mxcmci_finish_data(host, stat);
556 mxcmci_read_response(host, stat);
559 if (host->req->stop) {
560 if (mxcmci_start_cmd(host, host->req->stop, 0)) {
561 mxcmci_finish_request(host, host->req);
565 mxcmci_finish_request(host, host->req);
569 static void mxcmci_cmd_done(struct mxcmci_host *host, unsigned int stat)
571 mxcmci_read_response(host, stat);
574 if (!host->data && host->req) {
575 mxcmci_finish_request(host, host->req);
579 /* For the DMA case the DMA engine handles the data transfer
580 * automatically. For non DMA we have to do it ourselves.
581 * Don't do it in interrupt context though.
583 if (!mxcmci_use_dma(host) && host->data)
584 schedule_work(&host->datawork);
588 static irqreturn_t mxcmci_irq(int irq, void *devid)
590 struct mxcmci_host *host = devid;
595 stat = readl(host->base + MMC_REG_STATUS);
596 writel(stat & ~(STATUS_SDIO_INT_ACTIVE | STATUS_DATA_TRANS_DONE |
597 STATUS_WRITE_OP_DONE), host->base + MMC_REG_STATUS);
599 dev_dbg(mmc_dev(host->mmc), "%s: 0x%08x\n", __func__, stat);
601 spin_lock_irqsave(&host->lock, flags);
602 sdio_irq = (stat & STATUS_SDIO_INT_ACTIVE) && host->use_sdio;
603 spin_unlock_irqrestore(&host->lock, flags);
605 if (mxcmci_use_dma(host) &&
606 (stat & (STATUS_READ_OP_DONE | STATUS_WRITE_OP_DONE)))
607 writel(STATUS_READ_OP_DONE | STATUS_WRITE_OP_DONE,
608 host->base + MMC_REG_STATUS);
611 writel(STATUS_SDIO_INT_ACTIVE, host->base + MMC_REG_STATUS);
612 mmc_signal_sdio_irq(host->mmc);
615 if (stat & STATUS_END_CMD_RESP)
616 mxcmci_cmd_done(host, stat);
618 if (mxcmci_use_dma(host) &&
619 (stat & (STATUS_DATA_TRANS_DONE | STATUS_WRITE_OP_DONE)))
620 mxcmci_data_done(host, stat);
622 if (host->default_irq_mask &&
623 (stat & (STATUS_CARD_INSERTION | STATUS_CARD_REMOVAL)))
624 mmc_detect_change(host->mmc, msecs_to_jiffies(200));
629 static void mxcmci_request(struct mmc_host *mmc, struct mmc_request *req)
631 struct mxcmci_host *host = mmc_priv(mmc);
632 unsigned int cmdat = host->cmdat;
635 WARN_ON(host->req != NULL);
638 host->cmdat &= ~CMD_DAT_CONT_INIT;
644 error = mxcmci_setup_data(host, req->data);
646 req->cmd->error = error;
651 cmdat |= CMD_DAT_CONT_DATA_ENABLE;
653 if (req->data->flags & MMC_DATA_WRITE)
654 cmdat |= CMD_DAT_CONT_WRITE;
657 error = mxcmci_start_cmd(host, req->cmd, cmdat);
661 mxcmci_finish_request(host, req);
664 static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios)
666 unsigned int divider;
668 unsigned int clk_in = clk_get_rate(host->clk);
670 while (prescaler <= 0x800) {
671 for (divider = 1; divider <= 0xF; divider++) {
674 x = (clk_in / (divider + 1));
677 x /= (prescaler * 2);
691 writew((prescaler << 4) | divider, host->base + MMC_REG_CLK_RATE);
693 dev_dbg(mmc_dev(host->mmc), "scaler: %d divider: %d in: %d out: %d\n",
694 prescaler, divider, clk_in, clk_ios);
697 static int mxcmci_setup_dma(struct mmc_host *mmc)
699 struct mxcmci_host *host = mmc_priv(mmc);
700 struct dma_slave_config *config = &host->dma_slave_config;
702 config->dst_addr = host->res->start + MMC_REG_BUFFER_ACCESS;
703 config->src_addr = host->res->start + MMC_REG_BUFFER_ACCESS;
704 config->dst_addr_width = 4;
705 config->src_addr_width = 4;
706 config->dst_maxburst = host->burstlen;
707 config->src_maxburst = host->burstlen;
709 return dmaengine_slave_config(host->dma, config);
712 static void mxcmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
714 struct mxcmci_host *host = mmc_priv(mmc);
718 * use burstlen of 64 (16 words) in 4 bit mode (--> reg value 0)
719 * use burstlen of 16 (4 words) in 1 bit mode (--> reg value 16)
721 if (ios->bus_width == MMC_BUS_WIDTH_4)
726 if (mxcmci_use_dma(host) && burstlen != host->burstlen) {
727 host->burstlen = burstlen;
728 ret = mxcmci_setup_dma(mmc);
730 dev_err(mmc_dev(host->mmc),
731 "failed to config DMA channel. Falling back to PIO\n");
732 dma_release_channel(host->dma);
737 if (ios->bus_width == MMC_BUS_WIDTH_4)
738 host->cmdat |= CMD_DAT_CONT_BUS_WIDTH_4;
740 host->cmdat &= ~CMD_DAT_CONT_BUS_WIDTH_4;
742 if (host->power_mode != ios->power_mode) {
743 mxcmci_set_power(host, ios->power_mode, ios->vdd);
744 host->power_mode = ios->power_mode;
746 if (ios->power_mode == MMC_POWER_ON)
747 host->cmdat |= CMD_DAT_CONT_INIT;
751 mxcmci_set_clk_rate(host, ios->clock);
752 writew(STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK);
754 writew(STR_STP_CLK_STOP_CLK, host->base + MMC_REG_STR_STP_CLK);
757 host->clock = ios->clock;
760 static irqreturn_t mxcmci_detect_irq(int irq, void *data)
762 struct mmc_host *mmc = data;
764 dev_dbg(mmc_dev(mmc), "%s\n", __func__);
766 mmc_detect_change(mmc, msecs_to_jiffies(250));
770 static int mxcmci_get_ro(struct mmc_host *mmc)
772 struct mxcmci_host *host = mmc_priv(mmc);
774 if (host->pdata && host->pdata->get_ro)
775 return !!host->pdata->get_ro(mmc_dev(mmc));
777 * Board doesn't support read only detection; let the mmc core
783 static void mxcmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
785 struct mxcmci_host *host = mmc_priv(mmc);
789 spin_lock_irqsave(&host->lock, flags);
790 host->use_sdio = enable;
791 int_cntr = readl(host->base + MMC_REG_INT_CNTR);
794 int_cntr |= INT_SDIO_IRQ_EN;
796 int_cntr &= ~INT_SDIO_IRQ_EN;
798 writel(int_cntr, host->base + MMC_REG_INT_CNTR);
799 spin_unlock_irqrestore(&host->lock, flags);
802 static void mxcmci_init_card(struct mmc_host *host, struct mmc_card *card)
805 * MX3 SoCs have a silicon bug which corrupts CRC calculation of
806 * multi-block transfers when connected SDIO peripheral doesn't
807 * drive the BUSY line as required by the specs.
808 * One way to prevent this is to only allow 1-bit transfers.
811 if (cpu_is_mx3() && card->type == MMC_TYPE_SDIO)
812 host->caps &= ~MMC_CAP_4_BIT_DATA;
814 host->caps |= MMC_CAP_4_BIT_DATA;
817 static bool filter(struct dma_chan *chan, void *param)
819 struct mxcmci_host *host = param;
821 if (!imx_dma_is_general_purpose(chan))
824 chan->private = &host->dma_data;
829 static const struct mmc_host_ops mxcmci_ops = {
830 .request = mxcmci_request,
831 .set_ios = mxcmci_set_ios,
832 .get_ro = mxcmci_get_ro,
833 .enable_sdio_irq = mxcmci_enable_sdio_irq,
834 .init_card = mxcmci_init_card,
837 static int mxcmci_probe(struct platform_device *pdev)
839 struct mmc_host *mmc;
840 struct mxcmci_host *host = NULL;
841 struct resource *iores, *r;
845 pr_info("i.MX SDHC driver\n");
847 iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
848 irq = platform_get_irq(pdev, 0);
849 if (!iores || irq < 0)
852 r = request_mem_region(iores->start, resource_size(iores), pdev->name);
856 mmc = mmc_alloc_host(sizeof(struct mxcmci_host), &pdev->dev);
859 goto out_release_mem;
862 mmc->ops = &mxcmci_ops;
863 mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
865 /* MMC core transfer sizes tunable parameters */
867 mmc->max_blk_size = 2048;
868 mmc->max_blk_count = 65535;
869 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
870 mmc->max_seg_size = mmc->max_req_size;
872 host = mmc_priv(mmc);
873 host->base = ioremap(r->start, resource_size(r));
880 host->pdata = pdev->dev.platform_data;
881 spin_lock_init(&host->lock);
883 mxcmci_init_ocr(host);
885 if (host->pdata && host->pdata->dat3_card_detect)
886 host->default_irq_mask =
887 INT_CARD_INSERTION_EN | INT_CARD_REMOVAL_EN;
889 host->default_irq_mask = 0;
894 host->clk = clk_get(&pdev->dev, NULL);
895 if (IS_ERR(host->clk)) {
896 ret = PTR_ERR(host->clk);
899 clk_enable(host->clk);
901 mxcmci_softreset(host);
903 host->rev_no = readw(host->base + MMC_REG_REV_NO);
904 if (host->rev_no != 0x400) {
906 dev_err(mmc_dev(host->mmc), "wrong rev.no. 0x%08x. aborting.\n",
911 mmc->f_min = clk_get_rate(host->clk) >> 16;
912 mmc->f_max = clk_get_rate(host->clk) >> 1;
914 /* recommended in data sheet */
915 writew(0x2db4, host->base + MMC_REG_READ_TO);
917 writel(host->default_irq_mask, host->base + MMC_REG_INT_CNTR);
919 r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
921 host->dmareq = r->start;
922 host->dma_data.peripheral_type = IMX_DMATYPE_SDHC;
923 host->dma_data.priority = DMA_PRIO_LOW;
924 host->dma_data.dma_request = host->dmareq;
926 dma_cap_set(DMA_SLAVE, mask);
927 host->dma = dma_request_channel(mask, filter, host);
929 mmc->max_seg_size = dma_get_max_seg_size(
930 host->dma->device->dev);
934 dev_info(mmc_dev(host->mmc), "dma not available. Using PIO\n");
936 INIT_WORK(&host->datawork, mxcmci_datawork);
938 ret = request_irq(host->irq, mxcmci_irq, 0, DRIVER_NAME, host);
942 platform_set_drvdata(pdev, mmc);
944 if (host->pdata && host->pdata->init) {
945 ret = host->pdata->init(&pdev->dev, mxcmci_detect_irq,
956 free_irq(host->irq, host);
959 dma_release_channel(host->dma);
961 clk_disable(host->clk);
968 release_mem_region(iores->start, resource_size(iores));
972 static int mxcmci_remove(struct platform_device *pdev)
974 struct mmc_host *mmc = platform_get_drvdata(pdev);
975 struct mxcmci_host *host = mmc_priv(mmc);
977 platform_set_drvdata(pdev, NULL);
979 mmc_remove_host(mmc);
982 regulator_put(host->vcc);
984 if (host->pdata && host->pdata->exit)
985 host->pdata->exit(&pdev->dev, mmc);
987 free_irq(host->irq, host);
991 dma_release_channel(host->dma);
993 clk_disable(host->clk);
996 release_mem_region(host->res->start, resource_size(host->res));
1004 static int mxcmci_suspend(struct device *dev)
1006 struct mmc_host *mmc = dev_get_drvdata(dev);
1007 struct mxcmci_host *host = mmc_priv(mmc);
1011 ret = mmc_suspend_host(mmc);
1012 clk_disable(host->clk);
1017 static int mxcmci_resume(struct device *dev)
1019 struct mmc_host *mmc = dev_get_drvdata(dev);
1020 struct mxcmci_host *host = mmc_priv(mmc);
1023 clk_enable(host->clk);
1025 ret = mmc_resume_host(mmc);
1030 static const struct dev_pm_ops mxcmci_pm_ops = {
1031 .suspend = mxcmci_suspend,
1032 .resume = mxcmci_resume,
1036 static struct platform_driver mxcmci_driver = {
1037 .probe = mxcmci_probe,
1038 .remove = mxcmci_remove,
1040 .name = DRIVER_NAME,
1041 .owner = THIS_MODULE,
1043 .pm = &mxcmci_pm_ops,
1048 static int __init mxcmci_init(void)
1050 return platform_driver_register(&mxcmci_driver);
1053 static void __exit mxcmci_exit(void)
1055 platform_driver_unregister(&mxcmci_driver);
1058 module_init(mxcmci_init);
1059 module_exit(mxcmci_exit);
1061 MODULE_DESCRIPTION("i.MX Multimedia Card Interface Driver");
1062 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
1063 MODULE_LICENSE("GPL");
1064 MODULE_ALIAS("platform:imx-mmc");