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 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
32 #include "arm_pl180_mmci.h"
36 struct sdi_registers *base;
39 static int wait_for_command_end(struct mmc *dev, struct mmc_cmd *cmd)
41 u32 hoststatus, statusmask;
42 struct mmc_host *host = dev->priv;
44 statusmask = SDI_STA_CTIMEOUT | SDI_STA_CCRCFAIL;
45 if ((cmd->resp_type & MMC_RSP_PRESENT))
46 statusmask |= SDI_STA_CMDREND;
48 statusmask |= SDI_STA_CMDSENT;
51 hoststatus = readl(&host->base->status) & statusmask;
54 writel(statusmask, &host->base->status_clear);
55 if (hoststatus & SDI_STA_CTIMEOUT) {
56 printf("CMD%d time out\n", cmd->cmdidx);
58 } else if ((hoststatus & SDI_STA_CCRCFAIL) &&
59 (cmd->flags & MMC_RSP_CRC)) {
60 printf("CMD%d CRC error\n", cmd->cmdidx);
64 if (cmd->resp_type & MMC_RSP_PRESENT) {
65 cmd->response[0] = readl(&host->base->response0);
66 cmd->response[1] = readl(&host->base->response1);
67 cmd->response[2] = readl(&host->base->response2);
68 cmd->response[3] = readl(&host->base->response3);
69 debug("CMD%d response[0]:0x%08X, response[1]:0x%08X, "
70 "response[2]:0x%08X, response[3]:0x%08X\n",
71 cmd->cmdidx, cmd->response[0], cmd->response[1],
72 cmd->response[2], cmd->response[3]);
78 /* send command to the mmc card and wait for results */
79 static int do_command(struct mmc *dev, struct mmc_cmd *cmd)
83 struct mmc_host *host = dev->priv;
85 sdi_cmd = ((cmd->cmdidx & SDI_CMD_CMDINDEX_MASK) | SDI_CMD_CPSMEN);
88 sdi_cmd |= SDI_CMD_WAITRESP;
89 if (cmd->resp_type & MMC_RSP_136)
90 sdi_cmd |= SDI_CMD_LONGRESP;
93 writel((u32)cmd->cmdarg, &host->base->argument);
94 udelay(COMMAND_REG_DELAY);
95 writel(sdi_cmd, &host->base->command);
96 result = wait_for_command_end(dev, cmd);
98 /* After CMD2 set RCA to a none zero value. */
99 if ((result == 0) && (cmd->cmdidx == MMC_CMD_ALL_SEND_CID))
102 /* After CMD3 open drain is switched off and push pull is used. */
103 if ((result == 0) && (cmd->cmdidx == MMC_CMD_SET_RELATIVE_ADDR)) {
104 u32 sdi_pwr = readl(&host->base->power) & ~SDI_PWR_OPD;
105 writel(sdi_pwr, &host->base->power);
111 static int read_bytes(struct mmc *dev, u32 *dest, u32 blkcount, u32 blksize)
113 u32 *tempbuff = dest;
114 u64 xfercount = blkcount * blksize;
115 struct mmc_host *host = dev->priv;
116 u32 status, status_err;
118 debug("read_bytes: blkcount=%u blksize=%u\n", blkcount, blksize);
120 status = readl(&host->base->status);
121 status_err = status & (SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT |
123 while ((!status_err) && (xfercount >= sizeof(u32))) {
124 if (status & SDI_STA_RXDAVL) {
125 *(tempbuff) = readl(&host->base->fifo);
127 xfercount -= sizeof(u32);
129 status = readl(&host->base->status);
130 status_err = status & (SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT |
134 status_err = status &
135 (SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT | SDI_STA_DBCKEND |
137 while (!status_err) {
138 status = readl(&host->base->status);
139 status_err = status &
140 (SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT | SDI_STA_DBCKEND |
144 if (status & SDI_STA_DTIMEOUT) {
145 printf("Read data timed out, xfercount: %llu, status: 0x%08X\n",
148 } else if (status & SDI_STA_DCRCFAIL) {
149 printf("Read data bytes CRC error: 0x%x\n", status);
151 } else if (status & SDI_STA_RXOVERR) {
152 printf("Read data RX overflow error\n");
156 writel(SDI_ICR_MASK, &host->base->status_clear);
159 printf("Read data error, xfercount: %llu\n", xfercount);
166 static int write_bytes(struct mmc *dev, u32 *src, u32 blkcount, u32 blksize)
170 u64 xfercount = blkcount * blksize;
171 struct mmc_host *host = dev->priv;
172 u32 status, status_err;
174 debug("write_bytes: blkcount=%u blksize=%u\n", blkcount, blksize);
176 status = readl(&host->base->status);
177 status_err = status & (SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT);
178 while (!status_err && xfercount) {
179 if (status & SDI_STA_TXFIFOBW) {
180 if (xfercount >= SDI_FIFO_BURST_SIZE * sizeof(u32)) {
181 for (i = 0; i < SDI_FIFO_BURST_SIZE; i++)
182 writel(*(tempbuff + i),
184 tempbuff += SDI_FIFO_BURST_SIZE;
185 xfercount -= SDI_FIFO_BURST_SIZE * sizeof(u32);
187 while (xfercount >= sizeof(u32)) {
188 writel(*(tempbuff), &host->base->fifo);
190 xfercount -= sizeof(u32);
194 status = readl(&host->base->status);
195 status_err = status & (SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT);
198 status_err = status &
199 (SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT | SDI_STA_DBCKEND);
200 while (!status_err) {
201 status = readl(&host->base->status);
202 status_err = status &
203 (SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT | SDI_STA_DBCKEND);
206 if (status & SDI_STA_DTIMEOUT) {
207 printf("Write data timed out, xfercount:%llu,status:0x%08X\n",
210 } else if (status & SDI_STA_DCRCFAIL) {
211 printf("Write data CRC error\n");
215 writel(SDI_ICR_MASK, &host->base->status_clear);
218 printf("Write data error, xfercount:%llu", xfercount);
225 static int do_data_transfer(struct mmc *dev,
227 struct mmc_data *data)
229 int error = -ETIMEDOUT;
230 struct mmc_host *host = dev->priv;
233 u32 data_len = (u32) (data->blocks * data->blocksize);
235 blksz = (ffs(data->blocksize) - 1);
236 data_ctrl |= ((blksz << 4) & SDI_DCTRL_DBLKSIZE_MASK);
237 data_ctrl |= SDI_DCTRL_DTEN;
239 writel(SDI_DTIMER_DEFAULT, &host->base->datatimer);
240 writel(data_len, &host->base->datalength);
241 udelay(DATA_REG_DELAY);
243 if (data->flags & MMC_DATA_READ) {
244 data_ctrl |= SDI_DCTRL_DTDIR_IN;
245 writel(data_ctrl, &host->base->datactrl);
247 error = do_command(dev, cmd);
251 error = read_bytes(dev, (u32 *)data->dest, (u32)data->blocks,
252 (u32)data->blocksize);
253 } else if (data->flags & MMC_DATA_WRITE) {
254 error = do_command(dev, cmd);
258 writel(data_ctrl, &host->base->datactrl);
259 error = write_bytes(dev, (u32 *)data->src, (u32)data->blocks,
260 (u32)data->blocksize);
266 static int host_request(struct mmc *dev,
268 struct mmc_data *data)
273 result = do_data_transfer(dev, cmd, data);
275 result = do_command(dev, cmd);
280 /* MMC uses open drain drivers in the enumeration phase */
281 static int mmc_host_reset(struct mmc *dev)
283 struct mmc_host *host = dev->priv;
284 u32 sdi_u32 = SDI_PWR_OPD | SDI_PWR_PWRCTRL_ON;
286 writel(sdi_u32, &host->base->power);
291 static void host_set_ios(struct mmc *dev)
293 struct mmc_host *host = dev->priv;
296 sdi_clkcr = readl(&host->base->clock);
298 /* Ramp up the clock rate */
302 if (dev->clock >= dev->f_max)
303 dev->clock = dev->f_max;
305 clkdiv = ((ARM_MCLK / dev->clock) / 2) - 1;
307 if (clkdiv > SDI_CLKCR_CLKDIV_MASK)
308 clkdiv = SDI_CLKCR_CLKDIV_MASK;
310 sdi_clkcr &= ~(SDI_CLKCR_CLKDIV_MASK);
314 /* Set the bus width */
315 if (dev->bus_width) {
318 switch (dev->bus_width) {
320 buswidth |= SDI_CLKCR_WIDBUS_1;
323 buswidth |= SDI_CLKCR_WIDBUS_4;
326 printf("Invalid bus width\n");
329 sdi_clkcr &= ~(SDI_CLKCR_WIDBUS_MASK);
330 sdi_clkcr |= buswidth;
333 writel(sdi_clkcr, &host->base->clock);
334 udelay(CLK_CHANGE_DELAY);
337 struct mmc *alloc_mmc_struct(void)
339 struct mmc_host *host = NULL;
340 struct mmc *mmc_device = NULL;
342 host = malloc(sizeof(struct mmc_host));
346 mmc_device = malloc(sizeof(struct mmc));
350 mmc_device->priv = host;
359 * mmc_host_init - initialize the mmc controller.
360 * Set initial clock and power for mmc slot.
361 * Initialize mmc struct and register with mmc framework.
363 static int arm_pl180_mmci_host_init(struct mmc *dev)
365 struct mmc_host *host = dev->priv;
368 host->base = (struct sdi_registers *)CONFIG_ARM_PL180_MMCI_BASE;
370 /* Initially set power-on, full voltage & MMCI read */
372 writel(sdi_u32, &host->base->power);
374 /* setting clk freq 505KHz */
375 sdi_u32 = SDI_CLKCR_CLKDIV_INIT | SDI_CLKCR_CLKEN;
376 writel(sdi_u32, &host->base->clock);
377 udelay(CLK_CHANGE_DELAY);
379 /* Disable mmc interrupts */
380 sdi_u32 = readl(&host->base->mask0) & ~SDI_MASK0_MASK;
381 writel(sdi_u32, &host->base->mask0);
383 sprintf(dev->name, "MMC");
384 dev->clock = ARM_MCLK / (2 * (SDI_CLKCR_CLKDIV_INIT + 1));
385 dev->send_cmd = host_request;
386 dev->set_ios = host_set_ios;
387 dev->init = mmc_host_reset;
390 dev->voltages = VOLTAGE_WINDOW_MMC;
391 dev->f_min = dev->clock;
392 dev->f_max = CONFIG_ARM_PL180_MMCI_CLOCK_FREQ;
397 int arm_pl180_mmci_init(void)
402 dev = alloc_mmc_struct();
406 error = arm_pl180_mmci_host_init(dev);
408 printf("mmci_host_init error - %d\n", error);
415 debug("registered mmc interface number is:%d\n", dev->block_dev.dev);