u-boot/drivers/mmc/arm_pl180_mmci.c

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/*
* ARM PrimeCell MultiMedia Card Interface - PL180
*
* Copyright (C) ST-Ericsson SA 2010
*
* Author: Ulf Hansson <ulf.hansson@stericsson.com>
* Author: Martin Lundholm <martin.xa.lundholm@stericsson.com>
* Ported to drivers/mmc/ by: Matt Waddel <matt.waddel@linaro.org>
*
* SPDX-License-Identifier: GPL-2.0+
*/
/* #define DEBUG */
#include <asm/io.h>
#include "common.h"
#include <errno.h>
#include <mmc.h>
#include "arm_pl180_mmci.h"
#include <malloc.h>
static int wait_for_command_end(struct mmc *dev, struct mmc_cmd *cmd)
{
u32 hoststatus, statusmask;
struct pl180_mmc_host *host = dev->priv;
statusmask = SDI_STA_CTIMEOUT | SDI_STA_CCRCFAIL;
if ((cmd->resp_type & MMC_RSP_PRESENT))
statusmask |= SDI_STA_CMDREND;
else
statusmask |= SDI_STA_CMDSENT;
do
hoststatus = readl(&host->base->status) & statusmask;
while (!hoststatus);
writel(statusmask, &host->base->status_clear);
if (hoststatus & SDI_STA_CTIMEOUT) {
debug("CMD%d time out\n", cmd->cmdidx);
return -ETIMEDOUT;
} else if ((hoststatus & SDI_STA_CCRCFAIL) &&
(cmd->resp_type & MMC_RSP_CRC)) {
printf("CMD%d CRC error\n", cmd->cmdidx);
return -EILSEQ;
}
if (cmd->resp_type & MMC_RSP_PRESENT) {
cmd->response[0] = readl(&host->base->response0);
cmd->response[1] = readl(&host->base->response1);
cmd->response[2] = readl(&host->base->response2);
cmd->response[3] = readl(&host->base->response3);
debug("CMD%d response[0]:0x%08X, response[1]:0x%08X, "
"response[2]:0x%08X, response[3]:0x%08X\n",
cmd->cmdidx, cmd->response[0], cmd->response[1],
cmd->response[2], cmd->response[3]);
}
return 0;
}
/* send command to the mmc card and wait for results */
static int do_command(struct mmc *dev, struct mmc_cmd *cmd)
{
int result;
u32 sdi_cmd = 0;
struct pl180_mmc_host *host = dev->priv;
sdi_cmd = ((cmd->cmdidx & SDI_CMD_CMDINDEX_MASK) | SDI_CMD_CPSMEN);
if (cmd->resp_type) {
sdi_cmd |= SDI_CMD_WAITRESP;
if (cmd->resp_type & MMC_RSP_136)
sdi_cmd |= SDI_CMD_LONGRESP;
}
writel((u32)cmd->cmdarg, &host->base->argument);
udelay(COMMAND_REG_DELAY);
writel(sdi_cmd, &host->base->command);
result = wait_for_command_end(dev, cmd);
/* After CMD2 set RCA to a none zero value. */
if ((result == 0) && (cmd->cmdidx == MMC_CMD_ALL_SEND_CID))
dev->rca = 10;
/* After CMD3 open drain is switched off and push pull is used. */
if ((result == 0) && (cmd->cmdidx == MMC_CMD_SET_RELATIVE_ADDR)) {
u32 sdi_pwr = readl(&host->base->power) & ~SDI_PWR_OPD;
writel(sdi_pwr, &host->base->power);
}
return result;
}
static int read_bytes(struct mmc *dev, u32 *dest, u32 blkcount, u32 blksize)
{
u32 *tempbuff = dest;
u64 xfercount = blkcount * blksize;
struct pl180_mmc_host *host = dev->priv;
u32 status, status_err;
debug("read_bytes: blkcount=%u blksize=%u\n", blkcount, blksize);
status = readl(&host->base->status);
status_err = status & (SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT |
SDI_STA_RXOVERR);
while ((!status_err) && (xfercount >= sizeof(u32))) {
if (status & SDI_STA_RXDAVL) {
*(tempbuff) = readl(&host->base->fifo);
tempbuff++;
xfercount -= sizeof(u32);
}
status = readl(&host->base->status);
status_err = status & (SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT |
SDI_STA_RXOVERR);
}
status_err = status &
(SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT | SDI_STA_DBCKEND |
SDI_STA_RXOVERR);
while (!status_err) {
status = readl(&host->base->status);
status_err = status &
(SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT | SDI_STA_DBCKEND |
SDI_STA_RXOVERR);
}
if (status & SDI_STA_DTIMEOUT) {
printf("Read data timed out, xfercount: %llu, status: 0x%08X\n",
xfercount, status);
return -ETIMEDOUT;
} else if (status & SDI_STA_DCRCFAIL) {
printf("Read data bytes CRC error: 0x%x\n", status);
return -EILSEQ;
} else if (status & SDI_STA_RXOVERR) {
printf("Read data RX overflow error\n");
return -EIO;
}
writel(SDI_ICR_MASK, &host->base->status_clear);
if (xfercount) {
printf("Read data error, xfercount: %llu\n", xfercount);
return -ENOBUFS;
}
return 0;
}
static int write_bytes(struct mmc *dev, u32 *src, u32 blkcount, u32 blksize)
{
u32 *tempbuff = src;
int i;
u64 xfercount = blkcount * blksize;
struct pl180_mmc_host *host = dev->priv;
u32 status, status_err;
debug("write_bytes: blkcount=%u blksize=%u\n", blkcount, blksize);
status = readl(&host->base->status);
status_err = status & (SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT);
while (!status_err && xfercount) {
if (status & SDI_STA_TXFIFOBW) {
if (xfercount >= SDI_FIFO_BURST_SIZE * sizeof(u32)) {
for (i = 0; i < SDI_FIFO_BURST_SIZE; i++)
writel(*(tempbuff + i),
&host->base->fifo);
tempbuff += SDI_FIFO_BURST_SIZE;
xfercount -= SDI_FIFO_BURST_SIZE * sizeof(u32);
} else {
while (xfercount >= sizeof(u32)) {
writel(*(tempbuff), &host->base->fifo);
tempbuff++;
xfercount -= sizeof(u32);
}
}
}
status = readl(&host->base->status);
status_err = status & (SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT);
}
status_err = status &
(SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT | SDI_STA_DBCKEND);
while (!status_err) {
status = readl(&host->base->status);
status_err = status &
(SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT | SDI_STA_DBCKEND);
}
if (status & SDI_STA_DTIMEOUT) {
printf("Write data timed out, xfercount:%llu,status:0x%08X\n",
xfercount, status);
return -ETIMEDOUT;
} else if (status & SDI_STA_DCRCFAIL) {
printf("Write data CRC error\n");
return -EILSEQ;
}
writel(SDI_ICR_MASK, &host->base->status_clear);
if (xfercount) {
printf("Write data error, xfercount:%llu", xfercount);
return -ENOBUFS;
}
return 0;
}
static int do_data_transfer(struct mmc *dev,
struct mmc_cmd *cmd,
struct mmc_data *data)
{
int error = -ETIMEDOUT;
struct pl180_mmc_host *host = dev->priv;
u32 blksz = 0;
u32 data_ctrl = 0;
u32 data_len = (u32) (data->blocks * data->blocksize);
if (!host->version2) {
blksz = (ffs(data->blocksize) - 1);
data_ctrl |= ((blksz << 4) & SDI_DCTRL_DBLKSIZE_MASK);
} else {
blksz = data->blocksize;
data_ctrl |= (blksz << SDI_DCTRL_DBLOCKSIZE_V2_SHIFT);
}
data_ctrl |= SDI_DCTRL_DTEN | SDI_DCTRL_BUSYMODE;
writel(SDI_DTIMER_DEFAULT, &host->base->datatimer);
writel(data_len, &host->base->datalength);
udelay(DATA_REG_DELAY);
if (data->flags & MMC_DATA_READ) {
data_ctrl |= SDI_DCTRL_DTDIR_IN;
writel(data_ctrl, &host->base->datactrl);
error = do_command(dev, cmd);
if (error)
return error;
error = read_bytes(dev, (u32 *)data->dest, (u32)data->blocks,
(u32)data->blocksize);
} else if (data->flags & MMC_DATA_WRITE) {
error = do_command(dev, cmd);
if (error)
return error;
writel(data_ctrl, &host->base->datactrl);
error = write_bytes(dev, (u32 *)data->src, (u32)data->blocks,
(u32)data->blocksize);
}
return error;
}
static int host_request(struct mmc *dev,
struct mmc_cmd *cmd,
struct mmc_data *data)
{
int result;
if (data)
result = do_data_transfer(dev, cmd, data);
else
result = do_command(dev, cmd);
return result;
}
/* MMC uses open drain drivers in the enumeration phase */
static int mmc_host_reset(struct mmc *dev)
{
struct pl180_mmc_host *host = dev->priv;
writel(host->pwr_init, &host->base->power);
return 0;
}
static void host_set_ios(struct mmc *dev)
{
struct pl180_mmc_host *host = dev->priv;
u32 sdi_clkcr;
sdi_clkcr = readl(&host->base->clock);
/* Ramp up the clock rate */
if (dev->clock) {
u32 clkdiv = 0;
u32 tmp_clock;
if (dev->clock >= dev->cfg->f_max) {
clkdiv = 0;
dev->clock = dev->cfg->f_max;
} else {
clkdiv = (host->clock_in / dev->clock) - 2;
}
tmp_clock = host->clock_in / (clkdiv + 2);
while (tmp_clock > dev->clock) {
clkdiv++;
tmp_clock = host->clock_in / (clkdiv + 2);
}
if (clkdiv > SDI_CLKCR_CLKDIV_MASK)
clkdiv = SDI_CLKCR_CLKDIV_MASK;
tmp_clock = host->clock_in / (clkdiv + 2);
dev->clock = tmp_clock;
sdi_clkcr &= ~(SDI_CLKCR_CLKDIV_MASK);
sdi_clkcr |= clkdiv;
}
/* Set the bus width */
if (dev->bus_width) {
u32 buswidth = 0;
switch (dev->bus_width) {
case 1:
buswidth |= SDI_CLKCR_WIDBUS_1;
break;
case 4:
buswidth |= SDI_CLKCR_WIDBUS_4;
break;
case 8:
buswidth |= SDI_CLKCR_WIDBUS_8;
break;
default:
printf("Invalid bus width: %d\n", dev->bus_width);
break;
}
sdi_clkcr &= ~(SDI_CLKCR_WIDBUS_MASK);
sdi_clkcr |= buswidth;
}
writel(sdi_clkcr, &host->base->clock);
udelay(CLK_CHANGE_DELAY);
}
static const struct mmc_ops arm_pl180_mmci_ops = {
.send_cmd = host_request,
.set_ios = host_set_ios,
.init = mmc_host_reset,
};
/*
* mmc_host_init - initialize the mmc controller.
* Set initial clock and power for mmc slot.
* Initialize mmc struct and register with mmc framework.
*/
int arm_pl180_mmci_init(struct pl180_mmc_host *host)
{
struct mmc *mmc;
u32 sdi_u32;
writel(host->pwr_init, &host->base->power);
writel(host->clkdiv_init, &host->base->clock);
udelay(CLK_CHANGE_DELAY);
/* Disable mmc interrupts */
sdi_u32 = readl(&host->base->mask0) & ~SDI_MASK0_MASK;
writel(sdi_u32, &host->base->mask0);
host->cfg.name = host->name;
host->cfg.ops = &arm_pl180_mmci_ops;
/* TODO remove the duplicates */
host->cfg.host_caps = host->caps;
host->cfg.voltages = host->voltages;
host->cfg.f_min = host->clock_min;
host->cfg.f_max = host->clock_max;
if (host->b_max != 0)
host->cfg.b_max = host->b_max;
else
host->cfg.b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
mmc = mmc_create(&host->cfg, host);
if (mmc == NULL)
return -1;
debug("registered mmc interface number is:%d\n", mmc->block_dev.devnum);
return 0;
}