2 * ARM PrimeCell MultiMedia Card Interface - PL180
4 * Copyright (C) ST-Ericsson SA 2010
6 * Author: Ulf Hansson <ulf.hansson@stericsson.com>
7 * Author: Martin Lundholm <martin.xa.lundholm@stericsson.com>
8 * Ported to drivers/mmc/ by: Matt Waddel <matt.waddel@linaro.org>
10 * SPDX-License-Identifier: GPL-2.0+
19 #include "arm_pl180_mmci.h"
22 static int wait_for_command_end(struct mmc *dev, struct mmc_cmd *cmd)
24 u32 hoststatus, statusmask;
25 struct pl180_mmc_host *host = dev->priv;
27 statusmask = SDI_STA_CTIMEOUT | SDI_STA_CCRCFAIL;
28 if ((cmd->resp_type & MMC_RSP_PRESENT))
29 statusmask |= SDI_STA_CMDREND;
31 statusmask |= SDI_STA_CMDSENT;
34 hoststatus = readl(&host->base->status) & statusmask;
37 writel(statusmask, &host->base->status_clear);
38 if (hoststatus & SDI_STA_CTIMEOUT) {
39 debug("CMD%d time out\n", cmd->cmdidx);
41 } else if ((hoststatus & SDI_STA_CCRCFAIL) &&
42 (cmd->resp_type & MMC_RSP_CRC)) {
43 printf("CMD%d CRC error\n", cmd->cmdidx);
47 if (cmd->resp_type & MMC_RSP_PRESENT) {
48 cmd->response[0] = readl(&host->base->response0);
49 cmd->response[1] = readl(&host->base->response1);
50 cmd->response[2] = readl(&host->base->response2);
51 cmd->response[3] = readl(&host->base->response3);
52 debug("CMD%d response[0]:0x%08X, response[1]:0x%08X, "
53 "response[2]:0x%08X, response[3]:0x%08X\n",
54 cmd->cmdidx, cmd->response[0], cmd->response[1],
55 cmd->response[2], cmd->response[3]);
61 /* send command to the mmc card and wait for results */
62 static int do_command(struct mmc *dev, struct mmc_cmd *cmd)
66 struct pl180_mmc_host *host = dev->priv;
68 sdi_cmd = ((cmd->cmdidx & SDI_CMD_CMDINDEX_MASK) | SDI_CMD_CPSMEN);
71 sdi_cmd |= SDI_CMD_WAITRESP;
72 if (cmd->resp_type & MMC_RSP_136)
73 sdi_cmd |= SDI_CMD_LONGRESP;
76 writel((u32)cmd->cmdarg, &host->base->argument);
77 udelay(COMMAND_REG_DELAY);
78 writel(sdi_cmd, &host->base->command);
79 result = wait_for_command_end(dev, cmd);
81 /* After CMD2 set RCA to a none zero value. */
82 if ((result == 0) && (cmd->cmdidx == MMC_CMD_ALL_SEND_CID))
85 /* After CMD3 open drain is switched off and push pull is used. */
86 if ((result == 0) && (cmd->cmdidx == MMC_CMD_SET_RELATIVE_ADDR)) {
87 u32 sdi_pwr = readl(&host->base->power) & ~SDI_PWR_OPD;
88 writel(sdi_pwr, &host->base->power);
94 static int read_bytes(struct mmc *dev, u32 *dest, u32 blkcount, u32 blksize)
97 u64 xfercount = blkcount * blksize;
98 struct pl180_mmc_host *host = dev->priv;
99 u32 status, status_err;
101 debug("read_bytes: blkcount=%u blksize=%u\n", blkcount, blksize);
103 status = readl(&host->base->status);
104 status_err = status & (SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT |
106 while ((!status_err) && (xfercount >= sizeof(u32))) {
107 if (status & SDI_STA_RXDAVL) {
108 *(tempbuff) = readl(&host->base->fifo);
110 xfercount -= sizeof(u32);
112 status = readl(&host->base->status);
113 status_err = status & (SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT |
117 status_err = status &
118 (SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT | SDI_STA_DBCKEND |
120 while (!status_err) {
121 status = readl(&host->base->status);
122 status_err = status &
123 (SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT | SDI_STA_DBCKEND |
127 if (status & SDI_STA_DTIMEOUT) {
128 printf("Read data timed out, xfercount: %llu, status: 0x%08X\n",
131 } else if (status & SDI_STA_DCRCFAIL) {
132 printf("Read data bytes CRC error: 0x%x\n", status);
134 } else if (status & SDI_STA_RXOVERR) {
135 printf("Read data RX overflow error\n");
139 writel(SDI_ICR_MASK, &host->base->status_clear);
142 printf("Read data error, xfercount: %llu\n", xfercount);
149 static int write_bytes(struct mmc *dev, u32 *src, u32 blkcount, u32 blksize)
153 u64 xfercount = blkcount * blksize;
154 struct pl180_mmc_host *host = dev->priv;
155 u32 status, status_err;
157 debug("write_bytes: blkcount=%u blksize=%u\n", blkcount, blksize);
159 status = readl(&host->base->status);
160 status_err = status & (SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT);
161 while (!status_err && xfercount) {
162 if (status & SDI_STA_TXFIFOBW) {
163 if (xfercount >= SDI_FIFO_BURST_SIZE * sizeof(u32)) {
164 for (i = 0; i < SDI_FIFO_BURST_SIZE; i++)
165 writel(*(tempbuff + i),
167 tempbuff += SDI_FIFO_BURST_SIZE;
168 xfercount -= SDI_FIFO_BURST_SIZE * sizeof(u32);
170 while (xfercount >= sizeof(u32)) {
171 writel(*(tempbuff), &host->base->fifo);
173 xfercount -= sizeof(u32);
177 status = readl(&host->base->status);
178 status_err = status & (SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT);
181 status_err = status &
182 (SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT | SDI_STA_DBCKEND);
183 while (!status_err) {
184 status = readl(&host->base->status);
185 status_err = status &
186 (SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT | SDI_STA_DBCKEND);
189 if (status & SDI_STA_DTIMEOUT) {
190 printf("Write data timed out, xfercount:%llu,status:0x%08X\n",
193 } else if (status & SDI_STA_DCRCFAIL) {
194 printf("Write data CRC error\n");
198 writel(SDI_ICR_MASK, &host->base->status_clear);
201 printf("Write data error, xfercount:%llu", xfercount);
208 static int do_data_transfer(struct mmc *dev,
210 struct mmc_data *data)
212 int error = -ETIMEDOUT;
213 struct pl180_mmc_host *host = dev->priv;
216 u32 data_len = (u32) (data->blocks * data->blocksize);
218 if (!host->version2) {
219 blksz = (ffs(data->blocksize) - 1);
220 data_ctrl |= ((blksz << 4) & SDI_DCTRL_DBLKSIZE_MASK);
222 blksz = data->blocksize;
223 data_ctrl |= (blksz << SDI_DCTRL_DBLOCKSIZE_V2_SHIFT);
225 data_ctrl |= SDI_DCTRL_DTEN | SDI_DCTRL_BUSYMODE;
227 writel(SDI_DTIMER_DEFAULT, &host->base->datatimer);
228 writel(data_len, &host->base->datalength);
229 udelay(DATA_REG_DELAY);
231 if (data->flags & MMC_DATA_READ) {
232 data_ctrl |= SDI_DCTRL_DTDIR_IN;
233 writel(data_ctrl, &host->base->datactrl);
235 error = do_command(dev, cmd);
239 error = read_bytes(dev, (u32 *)data->dest, (u32)data->blocks,
240 (u32)data->blocksize);
241 } else if (data->flags & MMC_DATA_WRITE) {
242 error = do_command(dev, cmd);
246 writel(data_ctrl, &host->base->datactrl);
247 error = write_bytes(dev, (u32 *)data->src, (u32)data->blocks,
248 (u32)data->blocksize);
254 static int host_request(struct mmc *dev,
256 struct mmc_data *data)
261 result = do_data_transfer(dev, cmd, data);
263 result = do_command(dev, cmd);
268 /* MMC uses open drain drivers in the enumeration phase */
269 static int mmc_host_reset(struct mmc *dev)
271 struct pl180_mmc_host *host = dev->priv;
273 writel(host->pwr_init, &host->base->power);
278 static void host_set_ios(struct mmc *dev)
280 struct pl180_mmc_host *host = dev->priv;
283 sdi_clkcr = readl(&host->base->clock);
285 /* Ramp up the clock rate */
290 if (dev->clock >= dev->f_max) {
292 dev->clock = dev->f_max;
294 clkdiv = (host->clock_in / dev->clock) - 2;
297 tmp_clock = host->clock_in / (clkdiv + 2);
298 while (tmp_clock > dev->clock) {
300 tmp_clock = host->clock_in / (clkdiv + 2);
303 if (clkdiv > SDI_CLKCR_CLKDIV_MASK)
304 clkdiv = SDI_CLKCR_CLKDIV_MASK;
306 tmp_clock = host->clock_in / (clkdiv + 2);
307 dev->clock = tmp_clock;
308 sdi_clkcr &= ~(SDI_CLKCR_CLKDIV_MASK);
312 /* Set the bus width */
313 if (dev->bus_width) {
316 switch (dev->bus_width) {
318 buswidth |= SDI_CLKCR_WIDBUS_1;
321 buswidth |= SDI_CLKCR_WIDBUS_4;
324 buswidth |= SDI_CLKCR_WIDBUS_8;
327 printf("Invalid bus width: %d\n", dev->bus_width);
330 sdi_clkcr &= ~(SDI_CLKCR_WIDBUS_MASK);
331 sdi_clkcr |= buswidth;
334 writel(sdi_clkcr, &host->base->clock);
335 udelay(CLK_CHANGE_DELAY);
338 static const struct mmc_ops arm_pl180_mmci_ops = {
339 .send_cmd = host_request,
340 .set_ios = host_set_ios,
341 .init = mmc_host_reset,
345 * mmc_host_init - initialize the mmc controller.
346 * Set initial clock and power for mmc slot.
347 * Initialize mmc struct and register with mmc framework.
349 int arm_pl180_mmci_init(struct pl180_mmc_host *host)
354 dev = malloc(sizeof(struct mmc));
358 memset(dev, 0, sizeof(struct mmc));
361 writel(host->pwr_init, &host->base->power);
362 writel(host->clkdiv_init, &host->base->clock);
363 udelay(CLK_CHANGE_DELAY);
365 /* Disable mmc interrupts */
366 sdi_u32 = readl(&host->base->mask0) & ~SDI_MASK0_MASK;
367 writel(sdi_u32, &host->base->mask0);
368 strncpy(dev->name, host->name, sizeof(dev->name));
369 dev->ops = &arm_pl180_mmci_ops;
370 dev->host_caps = host->caps;
371 dev->voltages = host->voltages;
372 dev->f_min = host->clock_min;
373 dev->f_max = host->clock_max;
374 dev->b_max = host->b_max;
376 debug("registered mmc interface number is:%d\n", dev->block_dev.dev);