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 seperate 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>
37 #include <asm/sizes.h>
40 #ifdef CONFIG_ARCH_MX2
41 #include <mach/dma-mx1-mx2.h>
45 #define DRIVER_NAME "mxc-mmc"
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
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)
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
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)
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)
115 struct mmc_host *mmc;
116 struct resource *res;
122 unsigned int power_mode;
123 struct imxmmc_platform_data *pdata;
125 struct mmc_request *req;
126 struct mmc_command *cmd;
127 struct mmc_data *data;
129 unsigned int dma_nents;
130 unsigned int datasize;
131 unsigned int dma_dir;
140 struct work_struct datawork;
143 static inline int mxcmci_use_dma(struct mxcmci_host *host)
148 static void mxcmci_softreset(struct mxcmci_host *host)
153 writew(STR_STP_CLK_RESET, host->base + MMC_REG_STR_STP_CLK);
154 writew(STR_STP_CLK_RESET | STR_STP_CLK_START_CLK,
155 host->base + MMC_REG_STR_STP_CLK);
157 for (i = 0; i < 8; i++)
158 writew(STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK);
160 writew(0xff, host->base + MMC_REG_RES_TO);
163 static void mxcmci_setup_data(struct mxcmci_host *host, struct mmc_data *data)
165 unsigned int nob = data->blocks;
166 unsigned int blksz = data->blksz;
167 unsigned int datasize = nob * blksz;
169 struct scatterlist *sg;
172 if (data->flags & MMC_DATA_STREAM)
176 data->bytes_xfered = 0;
178 writew(nob, host->base + MMC_REG_NOB);
179 writew(blksz, host->base + MMC_REG_BLK_LEN);
180 host->datasize = datasize;
183 for_each_sg(data->sg, sg, data->sg_len, i) {
184 if (sg->offset & 3 || sg->length & 3) {
190 if (data->flags & MMC_DATA_READ) {
191 host->dma_dir = DMA_FROM_DEVICE;
192 host->dma_nents = dma_map_sg(mmc_dev(host->mmc), data->sg,
193 data->sg_len, host->dma_dir);
195 imx_dma_setup_sg(host->dma, data->sg, host->dma_nents, datasize,
196 host->res->start + MMC_REG_BUFFER_ACCESS,
199 host->dma_dir = DMA_TO_DEVICE;
200 host->dma_nents = dma_map_sg(mmc_dev(host->mmc), data->sg,
201 data->sg_len, host->dma_dir);
203 imx_dma_setup_sg(host->dma, data->sg, host->dma_nents, datasize,
204 host->res->start + MMC_REG_BUFFER_ACCESS,
210 imx_dma_enable(host->dma);
214 static int mxcmci_start_cmd(struct mxcmci_host *host, struct mmc_command *cmd,
217 WARN_ON(host->cmd != NULL);
220 switch (mmc_resp_type(cmd)) {
221 case MMC_RSP_R1: /* short CRC, OPCODE */
222 case MMC_RSP_R1B:/* short CRC, OPCODE, BUSY */
223 cmdat |= CMD_DAT_CONT_RESPONSE_48BIT_CRC;
225 case MMC_RSP_R2: /* long 136 bit + CRC */
226 cmdat |= CMD_DAT_CONT_RESPONSE_136BIT;
228 case MMC_RSP_R3: /* short */
229 cmdat |= CMD_DAT_CONT_RESPONSE_48BIT;
234 dev_err(mmc_dev(host->mmc), "unhandled response type 0x%x\n",
236 cmd->error = -EINVAL;
240 if (mxcmci_use_dma(host))
241 writel(INT_READ_OP_EN | INT_WRITE_OP_DONE_EN |
243 host->base + MMC_REG_INT_CNTR);
245 writel(INT_END_CMD_RES_EN, host->base + MMC_REG_INT_CNTR);
247 writew(cmd->opcode, host->base + MMC_REG_CMD);
248 writel(cmd->arg, host->base + MMC_REG_ARG);
249 writew(cmdat, host->base + MMC_REG_CMD_DAT_CONT);
254 static void mxcmci_finish_request(struct mxcmci_host *host,
255 struct mmc_request *req)
257 writel(0, host->base + MMC_REG_INT_CNTR);
263 mmc_request_done(host->mmc, req);
266 static int mxcmci_finish_data(struct mxcmci_host *host, unsigned int stat)
268 struct mmc_data *data = host->data;
272 if (mxcmci_use_dma(host)) {
273 imx_dma_disable(host->dma);
274 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_nents,
279 if (stat & STATUS_ERR_MASK) {
280 dev_dbg(mmc_dev(host->mmc), "request failed. status: 0x%08x\n",
282 if (stat & STATUS_CRC_READ_ERR) {
283 data->error = -EILSEQ;
284 } else if (stat & STATUS_CRC_WRITE_ERR) {
285 u32 err_code = (stat >> 9) & 0x3;
286 if (err_code == 2) /* No CRC response */
287 data->error = -ETIMEDOUT;
289 data->error = -EILSEQ;
290 } else if (stat & STATUS_TIME_OUT_READ) {
291 data->error = -ETIMEDOUT;
296 data->bytes_xfered = host->datasize;
299 data_error = data->error;
306 static void mxcmci_read_response(struct mxcmci_host *host, unsigned int stat)
308 struct mmc_command *cmd = host->cmd;
315 if (stat & STATUS_TIME_OUT_RESP) {
316 dev_dbg(mmc_dev(host->mmc), "CMD TIMEOUT\n");
317 cmd->error = -ETIMEDOUT;
318 } else if (stat & STATUS_RESP_CRC_ERR && cmd->flags & MMC_RSP_CRC) {
319 dev_dbg(mmc_dev(host->mmc), "cmd crc error\n");
320 cmd->error = -EILSEQ;
323 if (cmd->flags & MMC_RSP_PRESENT) {
324 if (cmd->flags & MMC_RSP_136) {
325 for (i = 0; i < 4; i++) {
326 a = readw(host->base + MMC_REG_RES_FIFO);
327 b = readw(host->base + MMC_REG_RES_FIFO);
328 cmd->resp[i] = a << 16 | b;
331 a = readw(host->base + MMC_REG_RES_FIFO);
332 b = readw(host->base + MMC_REG_RES_FIFO);
333 c = readw(host->base + MMC_REG_RES_FIFO);
334 cmd->resp[0] = a << 24 | b << 8 | c >> 8;
339 static int mxcmci_poll_status(struct mxcmci_host *host, u32 mask)
342 unsigned long timeout = jiffies + HZ;
345 stat = readl(host->base + MMC_REG_STATUS);
346 if (stat & STATUS_ERR_MASK)
348 if (time_after(jiffies, timeout))
349 return STATUS_TIME_OUT_READ;
356 static int mxcmci_pull(struct mxcmci_host *host, void *_buf, int bytes)
362 stat = mxcmci_poll_status(host,
363 STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE);
366 *buf++ = readl(host->base + MMC_REG_BUFFER_ACCESS);
374 stat = mxcmci_poll_status(host,
375 STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE);
378 tmp = readl(host->base + MMC_REG_BUFFER_ACCESS);
379 memcpy(b, &tmp, bytes);
385 static int mxcmci_push(struct mxcmci_host *host, void *_buf, int bytes)
391 stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
394 writel(*buf++, host->base + MMC_REG_BUFFER_ACCESS);
402 stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
406 memcpy(&tmp, b, bytes);
407 writel(tmp, host->base + MMC_REG_BUFFER_ACCESS);
410 stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
417 static int mxcmci_transfer_data(struct mxcmci_host *host)
419 struct mmc_data *data = host->req->data;
420 struct scatterlist *sg;
428 if (data->flags & MMC_DATA_READ) {
429 for_each_sg(data->sg, sg, data->sg_len, i) {
430 stat = mxcmci_pull(host, sg_virt(sg), sg->length);
433 host->datasize += sg->length;
436 for_each_sg(data->sg, sg, data->sg_len, i) {
437 stat = mxcmci_push(host, sg_virt(sg), sg->length);
440 host->datasize += sg->length;
442 stat = mxcmci_poll_status(host, STATUS_WRITE_OP_DONE);
449 static void mxcmci_datawork(struct work_struct *work)
451 struct mxcmci_host *host = container_of(work, struct mxcmci_host,
453 int datastat = mxcmci_transfer_data(host);
454 mxcmci_finish_data(host, datastat);
456 if (host->req->stop) {
457 if (mxcmci_start_cmd(host, host->req->stop, 0)) {
458 mxcmci_finish_request(host, host->req);
462 mxcmci_finish_request(host, host->req);
467 static void mxcmci_data_done(struct mxcmci_host *host, unsigned int stat)
469 struct mmc_data *data = host->data;
475 data_error = mxcmci_finish_data(host, stat);
477 mxcmci_read_response(host, stat);
480 if (host->req->stop) {
481 if (mxcmci_start_cmd(host, host->req->stop, 0)) {
482 mxcmci_finish_request(host, host->req);
486 mxcmci_finish_request(host, host->req);
491 static void mxcmci_cmd_done(struct mxcmci_host *host, unsigned int stat)
493 mxcmci_read_response(host, stat);
496 if (!host->data && host->req) {
497 mxcmci_finish_request(host, host->req);
501 /* For the DMA case the DMA engine handles the data transfer
502 * automatically. For non DMA we have to to it ourselves.
503 * Don't do it in interrupt context though.
505 if (!mxcmci_use_dma(host) && host->data)
506 schedule_work(&host->datawork);
510 static irqreturn_t mxcmci_irq(int irq, void *devid)
512 struct mxcmci_host *host = devid;
515 stat = readl(host->base + MMC_REG_STATUS);
516 writel(stat, host->base + MMC_REG_STATUS);
518 dev_dbg(mmc_dev(host->mmc), "%s: 0x%08x\n", __func__, stat);
520 if (stat & STATUS_END_CMD_RESP)
521 mxcmci_cmd_done(host, stat);
523 if (mxcmci_use_dma(host) &&
524 (stat & (STATUS_DATA_TRANS_DONE | STATUS_WRITE_OP_DONE)))
525 mxcmci_data_done(host, stat);
530 static void mxcmci_request(struct mmc_host *mmc, struct mmc_request *req)
532 struct mxcmci_host *host = mmc_priv(mmc);
533 unsigned int cmdat = host->cmdat;
535 WARN_ON(host->req != NULL);
538 host->cmdat &= ~CMD_DAT_CONT_INIT;
543 mxcmci_setup_data(host, req->data);
545 cmdat |= CMD_DAT_CONT_DATA_ENABLE;
547 if (req->data->flags & MMC_DATA_WRITE)
548 cmdat |= CMD_DAT_CONT_WRITE;
551 if (mxcmci_start_cmd(host, req->cmd, cmdat))
552 mxcmci_finish_request(host, req);
555 static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios)
557 unsigned int divider;
559 unsigned int clk_in = clk_get_rate(host->clk);
561 while (prescaler <= 0x800) {
562 for (divider = 1; divider <= 0xF; divider++) {
565 x = (clk_in / (divider + 1));
568 x /= (prescaler * 2);
582 writew((prescaler << 4) | divider, host->base + MMC_REG_CLK_RATE);
584 dev_dbg(mmc_dev(host->mmc), "scaler: %d divider: %d in: %d out: %d\n",
585 prescaler, divider, clk_in, clk_ios);
588 static void mxcmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
590 struct mxcmci_host *host = mmc_priv(mmc);
594 * use burstlen of 64 in 4 bit mode (--> reg value 0)
595 * use burstlen of 16 in 1 bit mode (--> reg value 16)
597 if (ios->bus_width == MMC_BUS_WIDTH_4)
602 imx_dma_config_burstlen(host->dma, blen);
604 if (ios->bus_width == MMC_BUS_WIDTH_4)
605 host->cmdat |= CMD_DAT_CONT_BUS_WIDTH_4;
607 host->cmdat &= ~CMD_DAT_CONT_BUS_WIDTH_4;
609 if (host->power_mode != ios->power_mode) {
610 if (host->pdata && host->pdata->setpower)
611 host->pdata->setpower(mmc_dev(mmc), ios->vdd);
612 host->power_mode = ios->power_mode;
613 if (ios->power_mode == MMC_POWER_ON)
614 host->cmdat |= CMD_DAT_CONT_INIT;
618 mxcmci_set_clk_rate(host, ios->clock);
619 writew(STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK);
621 writew(STR_STP_CLK_STOP_CLK, host->base + MMC_REG_STR_STP_CLK);
624 host->clock = ios->clock;
627 static irqreturn_t mxcmci_detect_irq(int irq, void *data)
629 struct mmc_host *mmc = data;
631 dev_dbg(mmc_dev(mmc), "%s\n", __func__);
633 mmc_detect_change(mmc, msecs_to_jiffies(250));
637 static int mxcmci_get_ro(struct mmc_host *mmc)
639 struct mxcmci_host *host = mmc_priv(mmc);
641 if (host->pdata && host->pdata->get_ro)
642 return !!host->pdata->get_ro(mmc_dev(mmc));
644 * Board doesn't support read only detection; let the mmc core
651 static const struct mmc_host_ops mxcmci_ops = {
652 .request = mxcmci_request,
653 .set_ios = mxcmci_set_ios,
654 .get_ro = mxcmci_get_ro,
657 static int mxcmci_probe(struct platform_device *pdev)
659 struct mmc_host *mmc;
660 struct mxcmci_host *host = NULL;
664 printk(KERN_INFO "i.MX SDHC driver\n");
666 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
667 irq = platform_get_irq(pdev, 0);
671 r = request_mem_region(r->start, resource_size(r), pdev->name);
675 mmc = mmc_alloc_host(sizeof(struct mxcmci_host), &pdev->dev);
678 goto out_release_mem;
681 mmc->ops = &mxcmci_ops;
682 mmc->caps = MMC_CAP_4_BIT_DATA;
684 /* MMC core transfer sizes tunable parameters */
685 mmc->max_hw_segs = 64;
686 mmc->max_phys_segs = 64;
687 mmc->max_blk_size = 2048;
688 mmc->max_blk_count = 65535;
689 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
690 mmc->max_seg_size = mmc->max_seg_size;
692 host = mmc_priv(mmc);
693 host->base = ioremap(r->start, resource_size(r));
700 host->pdata = pdev->dev.platform_data;
702 if (host->pdata && host->pdata->ocr_avail)
703 mmc->ocr_avail = host->pdata->ocr_avail;
705 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
710 host->clk = clk_get(&pdev->dev, NULL);
711 if (IS_ERR(host->clk)) {
712 ret = PTR_ERR(host->clk);
715 clk_enable(host->clk);
717 mxcmci_softreset(host);
719 host->rev_no = readw(host->base + MMC_REG_REV_NO);
720 if (host->rev_no != 0x400) {
722 dev_err(mmc_dev(host->mmc), "wrong rev.no. 0x%08x. aborting.\n",
727 mmc->f_min = clk_get_rate(host->clk) >> 7;
728 mmc->f_max = clk_get_rate(host->clk) >> 1;
730 /* recommended in data sheet */
731 writew(0x2db4, host->base + MMC_REG_READ_TO);
733 writel(0, host->base + MMC_REG_INT_CNTR);
736 host->dma = imx_dma_request_by_prio(DRIVER_NAME, DMA_PRIO_LOW);
738 dev_err(mmc_dev(host->mmc), "imx_dma_request_by_prio failed\n");
743 r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
749 ret = imx_dma_config_channel(host->dma,
750 IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_FIFO,
751 IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR,
754 dev_err(mmc_dev(host->mmc), "failed to config DMA channel\n");
758 INIT_WORK(&host->datawork, mxcmci_datawork);
760 ret = request_irq(host->irq, mxcmci_irq, 0, DRIVER_NAME, host);
764 platform_set_drvdata(pdev, mmc);
766 if (host->pdata && host->pdata->init) {
767 ret = host->pdata->init(&pdev->dev, mxcmci_detect_irq,
778 free_irq(host->irq, host);
781 imx_dma_free(host->dma);
784 clk_disable(host->clk);
791 release_mem_region(host->res->start, resource_size(host->res));
795 static int mxcmci_remove(struct platform_device *pdev)
797 struct mmc_host *mmc = platform_get_drvdata(pdev);
798 struct mxcmci_host *host = mmc_priv(mmc);
800 platform_set_drvdata(pdev, NULL);
802 mmc_remove_host(mmc);
804 if (host->pdata && host->pdata->exit)
805 host->pdata->exit(&pdev->dev, mmc);
807 free_irq(host->irq, host);
810 imx_dma_free(host->dma);
812 clk_disable(host->clk);
815 release_mem_region(host->res->start, resource_size(host->res));
816 release_resource(host->res);
824 static int mxcmci_suspend(struct platform_device *dev, pm_message_t state)
826 struct mmc_host *mmc = platform_get_drvdata(dev);
830 ret = mmc_suspend_host(mmc, state);
835 static int mxcmci_resume(struct platform_device *dev)
837 struct mmc_host *mmc = platform_get_drvdata(dev);
838 struct mxcmci_host *host;
842 host = mmc_priv(mmc);
843 ret = mmc_resume_host(mmc);
849 #define mxcmci_suspend NULL
850 #define mxcmci_resume NULL
851 #endif /* CONFIG_PM */
853 static struct platform_driver mxcmci_driver = {
854 .probe = mxcmci_probe,
855 .remove = mxcmci_remove,
856 .suspend = mxcmci_suspend,
857 .resume = mxcmci_resume,
860 .owner = THIS_MODULE,
864 static int __init mxcmci_init(void)
866 return platform_driver_register(&mxcmci_driver);
869 static void __exit mxcmci_exit(void)
871 platform_driver_unregister(&mxcmci_driver);
874 module_init(mxcmci_init);
875 module_exit(mxcmci_exit);
877 MODULE_DESCRIPTION("i.MX Multimedia Card Interface Driver");
878 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
879 MODULE_LICENSE("GPL");
880 MODULE_ALIAS("platform:imx-mmc");