u-boot/drivers/mmc/dw_mmc.c
Marek Vasut 26cc40d8c4 mmc: dw_mmc: Add RCRC handling
This patch adds check for command response CRC failure. The driver
is currently ignoring CRC check failure on command resposes which
have CRC atteched to it, which can be potentially dangerous. Even
more grueling problem happens when the command response is followed
by data transfer though, as in that case, the dwmci_data_transfer()
function will spin until it reaches the 240s timeout.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
2018-11-10 08:16:30 -05:00

563 lines
13 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2012 SAMSUNG Electronics
* Jaehoon Chung <jh80.chung@samsung.com>
* Rajeshawari Shinde <rajeshwari.s@samsung.com>
*/
#include <bouncebuf.h>
#include <common.h>
#include <errno.h>
#include <malloc.h>
#include <memalign.h>
#include <mmc.h>
#include <dwmmc.h>
#define PAGE_SIZE 4096
static int dwmci_wait_reset(struct dwmci_host *host, u32 value)
{
unsigned long timeout = 1000;
u32 ctrl;
dwmci_writel(host, DWMCI_CTRL, value);
while (timeout--) {
ctrl = dwmci_readl(host, DWMCI_CTRL);
if (!(ctrl & DWMCI_RESET_ALL))
return 1;
}
return 0;
}
static void dwmci_set_idma_desc(struct dwmci_idmac *idmac,
u32 desc0, u32 desc1, u32 desc2)
{
struct dwmci_idmac *desc = idmac;
desc->flags = desc0;
desc->cnt = desc1;
desc->addr = desc2;
desc->next_addr = (ulong)desc + sizeof(struct dwmci_idmac);
}
static void dwmci_prepare_data(struct dwmci_host *host,
struct mmc_data *data,
struct dwmci_idmac *cur_idmac,
void *bounce_buffer)
{
unsigned long ctrl;
unsigned int i = 0, flags, cnt, blk_cnt;
ulong data_start, data_end;
blk_cnt = data->blocks;
dwmci_wait_reset(host, DWMCI_CTRL_FIFO_RESET);
data_start = (ulong)cur_idmac;
dwmci_writel(host, DWMCI_DBADDR, (ulong)cur_idmac);
do {
flags = DWMCI_IDMAC_OWN | DWMCI_IDMAC_CH ;
flags |= (i == 0) ? DWMCI_IDMAC_FS : 0;
if (blk_cnt <= 8) {
flags |= DWMCI_IDMAC_LD;
cnt = data->blocksize * blk_cnt;
} else
cnt = data->blocksize * 8;
dwmci_set_idma_desc(cur_idmac, flags, cnt,
(ulong)bounce_buffer + (i * PAGE_SIZE));
if (blk_cnt <= 8)
break;
blk_cnt -= 8;
cur_idmac++;
i++;
} while(1);
data_end = (ulong)cur_idmac;
flush_dcache_range(data_start, data_end + ARCH_DMA_MINALIGN);
ctrl = dwmci_readl(host, DWMCI_CTRL);
ctrl |= DWMCI_IDMAC_EN | DWMCI_DMA_EN;
dwmci_writel(host, DWMCI_CTRL, ctrl);
ctrl = dwmci_readl(host, DWMCI_BMOD);
ctrl |= DWMCI_BMOD_IDMAC_FB | DWMCI_BMOD_IDMAC_EN;
dwmci_writel(host, DWMCI_BMOD, ctrl);
dwmci_writel(host, DWMCI_BLKSIZ, data->blocksize);
dwmci_writel(host, DWMCI_BYTCNT, data->blocksize * data->blocks);
}
static int dwmci_fifo_ready(struct dwmci_host *host, u32 bit, u32 *len)
{
u32 timeout = 20000;
*len = dwmci_readl(host, DWMCI_STATUS);
while (--timeout && (*len & bit)) {
udelay(200);
*len = dwmci_readl(host, DWMCI_STATUS);
}
if (!timeout) {
debug("%s: FIFO underflow timeout\n", __func__);
return -ETIMEDOUT;
}
return 0;
}
static int dwmci_data_transfer(struct dwmci_host *host, struct mmc_data *data)
{
int ret = 0;
u32 timeout = 240000;
u32 mask, size, i, len = 0;
u32 *buf = NULL;
ulong start = get_timer(0);
u32 fifo_depth = (((host->fifoth_val & RX_WMARK_MASK) >>
RX_WMARK_SHIFT) + 1) * 2;
size = data->blocksize * data->blocks / 4;
if (data->flags == MMC_DATA_READ)
buf = (unsigned int *)data->dest;
else
buf = (unsigned int *)data->src;
for (;;) {
mask = dwmci_readl(host, DWMCI_RINTSTS);
/* Error during data transfer. */
if (mask & (DWMCI_DATA_ERR | DWMCI_DATA_TOUT)) {
debug("%s: DATA ERROR!\n", __func__);
ret = -EINVAL;
break;
}
if (host->fifo_mode && size) {
len = 0;
if (data->flags == MMC_DATA_READ &&
(mask & DWMCI_INTMSK_RXDR)) {
while (size) {
ret = dwmci_fifo_ready(host,
DWMCI_FIFO_EMPTY,
&len);
if (ret < 0)
break;
len = (len >> DWMCI_FIFO_SHIFT) &
DWMCI_FIFO_MASK;
len = min(size, len);
for (i = 0; i < len; i++)
*buf++ =
dwmci_readl(host, DWMCI_DATA);
size = size > len ? (size - len) : 0;
}
dwmci_writel(host, DWMCI_RINTSTS,
DWMCI_INTMSK_RXDR);
} else if (data->flags == MMC_DATA_WRITE &&
(mask & DWMCI_INTMSK_TXDR)) {
while (size) {
ret = dwmci_fifo_ready(host,
DWMCI_FIFO_FULL,
&len);
if (ret < 0)
break;
len = fifo_depth - ((len >>
DWMCI_FIFO_SHIFT) &
DWMCI_FIFO_MASK);
len = min(size, len);
for (i = 0; i < len; i++)
dwmci_writel(host, DWMCI_DATA,
*buf++);
size = size > len ? (size - len) : 0;
}
dwmci_writel(host, DWMCI_RINTSTS,
DWMCI_INTMSK_TXDR);
}
}
/* Data arrived correctly. */
if (mask & DWMCI_INTMSK_DTO) {
ret = 0;
break;
}
/* Check for timeout. */
if (get_timer(start) > timeout) {
debug("%s: Timeout waiting for data!\n",
__func__);
ret = -ETIMEDOUT;
break;
}
}
dwmci_writel(host, DWMCI_RINTSTS, mask);
return ret;
}
static int dwmci_set_transfer_mode(struct dwmci_host *host,
struct mmc_data *data)
{
unsigned long mode;
mode = DWMCI_CMD_DATA_EXP;
if (data->flags & MMC_DATA_WRITE)
mode |= DWMCI_CMD_RW;
return mode;
}
#ifdef CONFIG_DM_MMC
static int dwmci_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
struct mmc_data *data)
{
struct mmc *mmc = mmc_get_mmc_dev(dev);
#else
static int dwmci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
struct mmc_data *data)
{
#endif
struct dwmci_host *host = mmc->priv;
ALLOC_CACHE_ALIGN_BUFFER(struct dwmci_idmac, cur_idmac,
data ? DIV_ROUND_UP(data->blocks, 8) : 0);
int ret = 0, flags = 0, i;
unsigned int timeout = 500;
u32 retry = 100000;
u32 mask, ctrl;
ulong start = get_timer(0);
struct bounce_buffer bbstate;
while (dwmci_readl(host, DWMCI_STATUS) & DWMCI_BUSY) {
if (get_timer(start) > timeout) {
debug("%s: Timeout on data busy\n", __func__);
return -ETIMEDOUT;
}
}
dwmci_writel(host, DWMCI_RINTSTS, DWMCI_INTMSK_ALL);
if (data) {
if (host->fifo_mode) {
dwmci_writel(host, DWMCI_BLKSIZ, data->blocksize);
dwmci_writel(host, DWMCI_BYTCNT,
data->blocksize * data->blocks);
dwmci_wait_reset(host, DWMCI_CTRL_FIFO_RESET);
} else {
if (data->flags == MMC_DATA_READ) {
bounce_buffer_start(&bbstate, (void*)data->dest,
data->blocksize *
data->blocks, GEN_BB_WRITE);
} else {
bounce_buffer_start(&bbstate, (void*)data->src,
data->blocksize *
data->blocks, GEN_BB_READ);
}
dwmci_prepare_data(host, data, cur_idmac,
bbstate.bounce_buffer);
}
}
dwmci_writel(host, DWMCI_CMDARG, cmd->cmdarg);
if (data)
flags = dwmci_set_transfer_mode(host, data);
if ((cmd->resp_type & MMC_RSP_136) && (cmd->resp_type & MMC_RSP_BUSY))
return -1;
if (cmd->cmdidx == MMC_CMD_STOP_TRANSMISSION)
flags |= DWMCI_CMD_ABORT_STOP;
else
flags |= DWMCI_CMD_PRV_DAT_WAIT;
if (cmd->resp_type & MMC_RSP_PRESENT) {
flags |= DWMCI_CMD_RESP_EXP;
if (cmd->resp_type & MMC_RSP_136)
flags |= DWMCI_CMD_RESP_LENGTH;
}
if (cmd->resp_type & MMC_RSP_CRC)
flags |= DWMCI_CMD_CHECK_CRC;
flags |= (cmd->cmdidx | DWMCI_CMD_START | DWMCI_CMD_USE_HOLD_REG);
debug("Sending CMD%d\n",cmd->cmdidx);
dwmci_writel(host, DWMCI_CMD, flags);
for (i = 0; i < retry; i++) {
mask = dwmci_readl(host, DWMCI_RINTSTS);
if (mask & DWMCI_INTMSK_CDONE) {
if (!data)
dwmci_writel(host, DWMCI_RINTSTS, mask);
break;
}
}
if (i == retry) {
debug("%s: Timeout.\n", __func__);
return -ETIMEDOUT;
}
if (mask & DWMCI_INTMSK_RTO) {
/*
* Timeout here is not necessarily fatal. (e)MMC cards
* will splat here when they receive CMD55 as they do
* not support this command and that is exactly the way
* to tell them apart from SD cards. Thus, this output
* below shall be debug(). eMMC cards also do not favor
* CMD8, please keep that in mind.
*/
debug("%s: Response Timeout.\n", __func__);
return -ETIMEDOUT;
} else if (mask & DWMCI_INTMSK_RE) {
debug("%s: Response Error.\n", __func__);
return -EIO;
} else if ((cmd->resp_type & MMC_RSP_CRC) &&
(mask & DWMCI_INTMSK_RCRC)) {
debug("%s: Response CRC Error.\n", __func__);
return -EIO;
}
if (cmd->resp_type & MMC_RSP_PRESENT) {
if (cmd->resp_type & MMC_RSP_136) {
cmd->response[0] = dwmci_readl(host, DWMCI_RESP3);
cmd->response[1] = dwmci_readl(host, DWMCI_RESP2);
cmd->response[2] = dwmci_readl(host, DWMCI_RESP1);
cmd->response[3] = dwmci_readl(host, DWMCI_RESP0);
} else {
cmd->response[0] = dwmci_readl(host, DWMCI_RESP0);
}
}
if (data) {
ret = dwmci_data_transfer(host, data);
/* only dma mode need it */
if (!host->fifo_mode) {
ctrl = dwmci_readl(host, DWMCI_CTRL);
ctrl &= ~(DWMCI_DMA_EN);
dwmci_writel(host, DWMCI_CTRL, ctrl);
bounce_buffer_stop(&bbstate);
}
}
udelay(100);
return ret;
}
static int dwmci_setup_bus(struct dwmci_host *host, u32 freq)
{
u32 div, status;
int timeout = 10000;
unsigned long sclk;
if ((freq == host->clock) || (freq == 0))
return 0;
/*
* If host->get_mmc_clk isn't defined,
* then assume that host->bus_hz is source clock value.
* host->bus_hz should be set by user.
*/
if (host->get_mmc_clk)
sclk = host->get_mmc_clk(host, freq);
else if (host->bus_hz)
sclk = host->bus_hz;
else {
debug("%s: Didn't get source clock value.\n", __func__);
return -EINVAL;
}
if (sclk == freq)
div = 0; /* bypass mode */
else
div = DIV_ROUND_UP(sclk, 2 * freq);
dwmci_writel(host, DWMCI_CLKENA, 0);
dwmci_writel(host, DWMCI_CLKSRC, 0);
dwmci_writel(host, DWMCI_CLKDIV, div);
dwmci_writel(host, DWMCI_CMD, DWMCI_CMD_PRV_DAT_WAIT |
DWMCI_CMD_UPD_CLK | DWMCI_CMD_START);
do {
status = dwmci_readl(host, DWMCI_CMD);
if (timeout-- < 0) {
debug("%s: Timeout!\n", __func__);
return -ETIMEDOUT;
}
} while (status & DWMCI_CMD_START);
dwmci_writel(host, DWMCI_CLKENA, DWMCI_CLKEN_ENABLE |
DWMCI_CLKEN_LOW_PWR);
dwmci_writel(host, DWMCI_CMD, DWMCI_CMD_PRV_DAT_WAIT |
DWMCI_CMD_UPD_CLK | DWMCI_CMD_START);
timeout = 10000;
do {
status = dwmci_readl(host, DWMCI_CMD);
if (timeout-- < 0) {
debug("%s: Timeout!\n", __func__);
return -ETIMEDOUT;
}
} while (status & DWMCI_CMD_START);
host->clock = freq;
return 0;
}
#ifdef CONFIG_DM_MMC
static int dwmci_set_ios(struct udevice *dev)
{
struct mmc *mmc = mmc_get_mmc_dev(dev);
#else
static int dwmci_set_ios(struct mmc *mmc)
{
#endif
struct dwmci_host *host = (struct dwmci_host *)mmc->priv;
u32 ctype, regs;
debug("Buswidth = %d, clock: %d\n", mmc->bus_width, mmc->clock);
dwmci_setup_bus(host, mmc->clock);
switch (mmc->bus_width) {
case 8:
ctype = DWMCI_CTYPE_8BIT;
break;
case 4:
ctype = DWMCI_CTYPE_4BIT;
break;
default:
ctype = DWMCI_CTYPE_1BIT;
break;
}
dwmci_writel(host, DWMCI_CTYPE, ctype);
regs = dwmci_readl(host, DWMCI_UHS_REG);
if (mmc->ddr_mode)
regs |= DWMCI_DDR_MODE;
else
regs &= ~DWMCI_DDR_MODE;
dwmci_writel(host, DWMCI_UHS_REG, regs);
if (host->clksel)
host->clksel(host);
return 0;
}
static int dwmci_init(struct mmc *mmc)
{
struct dwmci_host *host = mmc->priv;
if (host->board_init)
host->board_init(host);
dwmci_writel(host, DWMCI_PWREN, 1);
if (!dwmci_wait_reset(host, DWMCI_RESET_ALL)) {
debug("%s[%d] Fail-reset!!\n", __func__, __LINE__);
return -EIO;
}
/* Enumerate at 400KHz */
dwmci_setup_bus(host, mmc->cfg->f_min);
dwmci_writel(host, DWMCI_RINTSTS, 0xFFFFFFFF);
dwmci_writel(host, DWMCI_INTMASK, 0);
dwmci_writel(host, DWMCI_TMOUT, 0xFFFFFFFF);
dwmci_writel(host, DWMCI_IDINTEN, 0);
dwmci_writel(host, DWMCI_BMOD, 1);
if (!host->fifoth_val) {
uint32_t fifo_size;
fifo_size = dwmci_readl(host, DWMCI_FIFOTH);
fifo_size = ((fifo_size & RX_WMARK_MASK) >> RX_WMARK_SHIFT) + 1;
host->fifoth_val = MSIZE(0x2) | RX_WMARK(fifo_size / 2 - 1) |
TX_WMARK(fifo_size / 2);
}
dwmci_writel(host, DWMCI_FIFOTH, host->fifoth_val);
dwmci_writel(host, DWMCI_CLKENA, 0);
dwmci_writel(host, DWMCI_CLKSRC, 0);
return 0;
}
#ifdef CONFIG_DM_MMC
int dwmci_probe(struct udevice *dev)
{
struct mmc *mmc = mmc_get_mmc_dev(dev);
return dwmci_init(mmc);
}
const struct dm_mmc_ops dm_dwmci_ops = {
.send_cmd = dwmci_send_cmd,
.set_ios = dwmci_set_ios,
};
#else
static const struct mmc_ops dwmci_ops = {
.send_cmd = dwmci_send_cmd,
.set_ios = dwmci_set_ios,
.init = dwmci_init,
};
#endif
void dwmci_setup_cfg(struct mmc_config *cfg, struct dwmci_host *host,
u32 max_clk, u32 min_clk)
{
cfg->name = host->name;
#ifndef CONFIG_DM_MMC
cfg->ops = &dwmci_ops;
#endif
cfg->f_min = min_clk;
cfg->f_max = max_clk;
cfg->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
cfg->host_caps = host->caps;
if (host->buswidth == 8) {
cfg->host_caps |= MMC_MODE_8BIT;
cfg->host_caps &= ~MMC_MODE_4BIT;
} else {
cfg->host_caps |= MMC_MODE_4BIT;
cfg->host_caps &= ~MMC_MODE_8BIT;
}
cfg->host_caps |= MMC_MODE_HS | MMC_MODE_HS_52MHz;
cfg->b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
}
#ifdef CONFIG_BLK
int dwmci_bind(struct udevice *dev, struct mmc *mmc, struct mmc_config *cfg)
{
return mmc_bind(dev, mmc, cfg);
}
#else
int add_dwmci(struct dwmci_host *host, u32 max_clk, u32 min_clk)
{
dwmci_setup_cfg(&host->cfg, host, max_clk, min_clk);
host->mmc = mmc_create(&host->cfg, host);
if (host->mmc == NULL)
return -1;
return 0;
}
#endif