2 * This is a driver for the SDHC controller found in Freescale MX2/MX3
3 * SoCs. It is basically the same hardware as found on MX1 (imxmmc.c).
4 * Unlike the hardware found on MX1, this hardware just works and does
5 * not need all the quirks found in imxmmc.c, hence the seperate driver.
7 * Copyright (C) 2009 Ilya Yanok, <yanok@emcraft.com>
8 * Copyright (C) 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
9 * Copyright (C) 2006 Pavel Pisa, PiKRON <ppisa@pikron.com>
11 * derived from pxamci.c by Russell King
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
27 #include <linux/errno.h>
29 #include <asm/arch/clock.h>
31 #define DRIVER_NAME "mxc-mmc"
51 #define STR_STP_CLK_RESET (1 << 3)
52 #define STR_STP_CLK_START_CLK (1 << 1)
53 #define STR_STP_CLK_STOP_CLK (1 << 0)
55 #define STATUS_CARD_INSERTION (1 << 31)
56 #define STATUS_CARD_REMOVAL (1 << 30)
57 #define STATUS_YBUF_EMPTY (1 << 29)
58 #define STATUS_XBUF_EMPTY (1 << 28)
59 #define STATUS_YBUF_FULL (1 << 27)
60 #define STATUS_XBUF_FULL (1 << 26)
61 #define STATUS_BUF_UND_RUN (1 << 25)
62 #define STATUS_BUF_OVFL (1 << 24)
63 #define STATUS_SDIO_INT_ACTIVE (1 << 14)
64 #define STATUS_END_CMD_RESP (1 << 13)
65 #define STATUS_WRITE_OP_DONE (1 << 12)
66 #define STATUS_DATA_TRANS_DONE (1 << 11)
67 #define STATUS_READ_OP_DONE (1 << 11)
68 #define STATUS_WR_CRC_ERROR_CODE_MASK (3 << 10)
69 #define STATUS_CARD_BUS_CLK_RUN (1 << 8)
70 #define STATUS_BUF_READ_RDY (1 << 7)
71 #define STATUS_BUF_WRITE_RDY (1 << 6)
72 #define STATUS_RESP_CRC_ERR (1 << 5)
73 #define STATUS_CRC_READ_ERR (1 << 3)
74 #define STATUS_CRC_WRITE_ERR (1 << 2)
75 #define STATUS_TIME_OUT_RESP (1 << 1)
76 #define STATUS_TIME_OUT_READ (1 << 0)
77 #define STATUS_ERR_MASK 0x2f
79 #define CMD_DAT_CONT_CMD_RESP_LONG_OFF (1 << 12)
80 #define CMD_DAT_CONT_STOP_READWAIT (1 << 11)
81 #define CMD_DAT_CONT_START_READWAIT (1 << 10)
82 #define CMD_DAT_CONT_BUS_WIDTH_4 (2 << 8)
83 #define CMD_DAT_CONT_INIT (1 << 7)
84 #define CMD_DAT_CONT_WRITE (1 << 4)
85 #define CMD_DAT_CONT_DATA_ENABLE (1 << 3)
86 #define CMD_DAT_CONT_RESPONSE_48BIT_CRC (1 << 0)
87 #define CMD_DAT_CONT_RESPONSE_136BIT (2 << 0)
88 #define CMD_DAT_CONT_RESPONSE_48BIT (3 << 0)
90 #define INT_SDIO_INT_WKP_EN (1 << 18)
91 #define INT_CARD_INSERTION_WKP_EN (1 << 17)
92 #define INT_CARD_REMOVAL_WKP_EN (1 << 16)
93 #define INT_CARD_INSERTION_EN (1 << 15)
94 #define INT_CARD_REMOVAL_EN (1 << 14)
95 #define INT_SDIO_IRQ_EN (1 << 13)
96 #define INT_DAT0_EN (1 << 12)
97 #define INT_BUF_READ_EN (1 << 4)
98 #define INT_BUF_WRITE_EN (1 << 3)
99 #define INT_END_CMD_RES_EN (1 << 2)
100 #define INT_WRITE_OP_DONE_EN (1 << 1)
101 #define INT_READ_OP_EN (1 << 0)
105 struct mxcmci_regs *base;
110 unsigned int power_mode;
113 struct mmc_data *data;
115 unsigned int dma_nents;
116 unsigned int datasize;
117 unsigned int dma_dir;
125 static struct mxcmci_host mxcmci_host;
127 /* maintainer note: do we really want to have a global host pointer? */
128 static struct mxcmci_host *host = &mxcmci_host;
130 static inline int mxcmci_use_dma(struct mxcmci_host *host)
135 static void mxcmci_softreset(struct mxcmci_host *host)
140 writel(STR_STP_CLK_RESET, &host->base->str_stp_clk);
141 writel(STR_STP_CLK_RESET | STR_STP_CLK_START_CLK,
142 &host->base->str_stp_clk);
144 for (i = 0; i < 8; i++)
145 writel(STR_STP_CLK_START_CLK, &host->base->str_stp_clk);
147 writel(0xff, &host->base->res_to);
150 static void mxcmci_setup_data(struct mxcmci_host *host, struct mmc_data *data)
152 unsigned int nob = data->blocks;
153 unsigned int blksz = data->blocksize;
154 unsigned int datasize = nob * blksz;
158 writel(nob, &host->base->nob);
159 writel(blksz, &host->base->blk_len);
160 host->datasize = datasize;
163 static int mxcmci_start_cmd(struct mxcmci_host *host, struct mmc_cmd *cmd,
166 if (host->cmd != NULL)
167 printf("mxcmci: error!\n");
170 switch (cmd->resp_type) {
171 case MMC_RSP_R1: /* short CRC, OPCODE */
172 case MMC_RSP_R1b:/* short CRC, OPCODE, BUSY */
173 cmdat |= CMD_DAT_CONT_RESPONSE_48BIT_CRC;
175 case MMC_RSP_R2: /* long 136 bit + CRC */
176 cmdat |= CMD_DAT_CONT_RESPONSE_136BIT;
178 case MMC_RSP_R3: /* short */
179 cmdat |= CMD_DAT_CONT_RESPONSE_48BIT;
184 printf("mxcmci: unhandled response type 0x%x\n",
189 writel(cmd->cmdidx, &host->base->cmd);
190 writel(cmd->cmdarg, &host->base->arg);
191 writel(cmdat, &host->base->cmd_dat_cont);
196 static void mxcmci_finish_request(struct mxcmci_host *host,
197 struct mmc_cmd *cmd, struct mmc_data *data)
203 static int mxcmci_finish_data(struct mxcmci_host *host, unsigned int stat)
207 if (stat & STATUS_ERR_MASK) {
208 printf("request failed. status: 0x%08x\n",
210 if (stat & STATUS_CRC_READ_ERR) {
211 data_error = -EILSEQ;
212 } else if (stat & STATUS_CRC_WRITE_ERR) {
213 u32 err_code = (stat >> 9) & 0x3;
214 if (err_code == 2) /* No CRC response */
215 data_error = -ETIMEDOUT;
217 data_error = -EILSEQ;
218 } else if (stat & STATUS_TIME_OUT_READ) {
219 data_error = -ETIMEDOUT;
230 static int mxcmci_read_response(struct mxcmci_host *host, unsigned int stat)
232 struct mmc_cmd *cmd = host->cmd;
235 u32 *resp = (u32 *)cmd->response;
240 if (stat & STATUS_TIME_OUT_RESP) {
241 printf("CMD TIMEOUT\n");
243 } else if (stat & STATUS_RESP_CRC_ERR && cmd->resp_type & MMC_RSP_CRC) {
244 printf("cmd crc error\n");
248 if (cmd->resp_type & MMC_RSP_PRESENT) {
249 if (cmd->resp_type & MMC_RSP_136) {
250 for (i = 0; i < 4; i++) {
251 a = readl(&host->base->res_fifo) & 0xFFFF;
252 b = readl(&host->base->res_fifo) & 0xFFFF;
253 resp[i] = a << 16 | b;
256 a = readl(&host->base->res_fifo) & 0xFFFF;
257 b = readl(&host->base->res_fifo) & 0xFFFF;
258 c = readl(&host->base->res_fifo) & 0xFFFF;
259 resp[0] = a << 24 | b << 8 | c >> 8;
265 static int mxcmci_poll_status(struct mxcmci_host *host, u32 mask)
268 unsigned long timeout = get_ticks() + CONFIG_SYS_HZ;
271 stat = readl(&host->base->status);
272 if (stat & STATUS_ERR_MASK)
274 if (timeout < get_ticks())
275 return STATUS_TIME_OUT_READ;
281 static int mxcmci_pull(struct mxcmci_host *host, void *_buf, int bytes)
287 stat = mxcmci_poll_status(host,
288 STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE);
291 *buf++ = readl(&host->base->buffer_access);
299 stat = mxcmci_poll_status(host,
300 STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE);
303 tmp = readl(&host->base->buffer_access);
304 memcpy(b, &tmp, bytes);
310 static int mxcmci_push(struct mxcmci_host *host, const void *_buf, int bytes)
313 const u32 *buf = _buf;
316 stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
319 writel(*buf++, &host->base->buffer_access);
324 const u8 *b = (u8 *)buf;
327 stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
331 memcpy(&tmp, b, bytes);
332 writel(tmp, &host->base->buffer_access);
335 stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
342 static int mxcmci_transfer_data(struct mxcmci_host *host)
344 struct mmc_data *data = host->data;
346 unsigned long length;
348 length = data->blocks * data->blocksize;
351 if (data->flags & MMC_DATA_READ) {
352 stat = mxcmci_pull(host, data->dest, length);
355 host->datasize += length;
357 stat = mxcmci_push(host, (const void *)(data->src), length);
360 host->datasize += length;
361 stat = mxcmci_poll_status(host, STATUS_WRITE_OP_DONE);
368 static int mxcmci_cmd_done(struct mxcmci_host *host, unsigned int stat)
373 ret = mxcmci_read_response(host, stat);
376 mxcmci_finish_request(host, host->cmd, host->data);
381 mxcmci_finish_request(host, host->cmd, host->data);
385 datastat = mxcmci_transfer_data(host);
386 ret = mxcmci_finish_data(host, datastat);
387 mxcmci_finish_request(host, host->cmd, host->data);
391 static int mxcmci_request(struct mmc *mmc, struct mmc_cmd *cmd,
392 struct mmc_data *data)
394 struct mxcmci_host *host = mmc->priv;
395 unsigned int cmdat = host->cmdat;
399 host->cmdat &= ~CMD_DAT_CONT_INIT;
401 mxcmci_setup_data(host, data);
403 cmdat |= CMD_DAT_CONT_DATA_ENABLE;
405 if (data->flags & MMC_DATA_WRITE)
406 cmdat |= CMD_DAT_CONT_WRITE;
409 if ((ret = mxcmci_start_cmd(host, cmd, cmdat))) {
410 mxcmci_finish_request(host, cmd, data);
415 stat = readl(&host->base->status);
416 writel(stat, &host->base->status);
417 } while (!(stat & STATUS_END_CMD_RESP));
419 return mxcmci_cmd_done(host, stat);
422 static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios)
424 unsigned int divider;
426 unsigned long clk_in = mxc_get_clock(MXC_ESDHC_CLK);
428 while (prescaler <= 0x800) {
429 for (divider = 1; divider <= 0xF; divider++) {
432 x = (clk_in / (divider + 1));
435 x /= (prescaler * 2);
449 writel((prescaler << 4) | divider, &host->base->clk_rate);
452 static int mxcmci_set_ios(struct mmc *mmc)
454 struct mxcmci_host *host = mmc->priv;
455 if (mmc->bus_width == 4)
456 host->cmdat |= CMD_DAT_CONT_BUS_WIDTH_4;
458 host->cmdat &= ~CMD_DAT_CONT_BUS_WIDTH_4;
461 mxcmci_set_clk_rate(host, mmc->clock);
462 writel(STR_STP_CLK_START_CLK, &host->base->str_stp_clk);
464 writel(STR_STP_CLK_STOP_CLK, &host->base->str_stp_clk);
467 host->clock = mmc->clock;
472 static int mxcmci_init(struct mmc *mmc)
474 struct mxcmci_host *host = mmc->priv;
476 mxcmci_softreset(host);
478 host->rev_no = readl(&host->base->rev_no);
479 if (host->rev_no != 0x400) {
480 printf("wrong rev.no. 0x%08x. aborting.\n",
485 /* recommended in data sheet */
486 writel(0x2db4, &host->base->read_to);
488 writel(0, &host->base->int_cntr);
493 static const struct mmc_ops mxcmci_ops = {
494 .send_cmd = mxcmci_request,
495 .set_ios = mxcmci_set_ios,
499 static struct mmc_config mxcmci_cfg = {
502 .host_caps = MMC_MODE_4BIT,
503 .voltages = MMC_VDD_32_33 | MMC_VDD_33_34,
504 .b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT,
507 static int mxcmci_initialize(bd_t *bis)
509 host->base = (struct mxcmci_regs *)CONFIG_MXC_MCI_REGS_BASE;
511 mxcmci_cfg.f_min = mxc_get_clock(MXC_ESDHC_CLK) >> 7;
512 mxcmci_cfg.f_max = mxc_get_clock(MXC_ESDHC_CLK) >> 1;
514 host->mmc = mmc_create(&mxcmci_cfg, host);
515 if (host->mmc == NULL)
521 int mxc_mmc_init(bd_t *bis)
523 return mxcmci_initialize(bis);