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u-boot/drivers/mmc/stm32_sdmmc2.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style 
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

611 lines
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2017, STMicroelectronics - All Rights Reserved
* Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
*/
#include <common.h>
#include <clk.h>
#include <dm.h>
#include <fdtdec.h>
#include <linux/libfdt.h>
#include <mmc.h>
#include <reset.h>
#include <asm/io.h>
#include <asm/gpio.h>
#include <linux/iopoll.h>
struct stm32_sdmmc2_plat {
struct mmc_config cfg;
struct mmc mmc;
};
struct stm32_sdmmc2_priv {
fdt_addr_t base;
struct clk clk;
struct reset_ctl reset_ctl;
struct gpio_desc cd_gpio;
u32 clk_reg_msk;
u32 pwr_reg_msk;
};
struct stm32_sdmmc2_ctx {
u32 cache_start;
u32 cache_end;
u32 data_length;
bool dpsm_abort;
};
/* SDMMC REGISTERS OFFSET */
#define SDMMC_POWER 0x00 /* SDMMC power control */
#define SDMMC_CLKCR 0x04 /* SDMMC clock control */
#define SDMMC_ARG 0x08 /* SDMMC argument */
#define SDMMC_CMD 0x0C /* SDMMC command */
#define SDMMC_RESP1 0x14 /* SDMMC response 1 */
#define SDMMC_RESP2 0x18 /* SDMMC response 2 */
#define SDMMC_RESP3 0x1C /* SDMMC response 3 */
#define SDMMC_RESP4 0x20 /* SDMMC response 4 */
#define SDMMC_DTIMER 0x24 /* SDMMC data timer */
#define SDMMC_DLEN 0x28 /* SDMMC data length */
#define SDMMC_DCTRL 0x2C /* SDMMC data control */
#define SDMMC_DCOUNT 0x30 /* SDMMC data counter */
#define SDMMC_STA 0x34 /* SDMMC status */
#define SDMMC_ICR 0x38 /* SDMMC interrupt clear */
#define SDMMC_MASK 0x3C /* SDMMC mask */
#define SDMMC_IDMACTRL 0x50 /* SDMMC DMA control */
#define SDMMC_IDMABASE0 0x58 /* SDMMC DMA buffer 0 base address */
/* SDMMC_POWER register */
#define SDMMC_POWER_PWRCTRL GENMASK(1, 0)
#define SDMMC_POWER_VSWITCH BIT(2)
#define SDMMC_POWER_VSWITCHEN BIT(3)
#define SDMMC_POWER_DIRPOL BIT(4)
/* SDMMC_CLKCR register */
#define SDMMC_CLKCR_CLKDIV GENMASK(9, 0)
#define SDMMC_CLKCR_CLKDIV_MAX SDMMC_CLKCR_CLKDIV
#define SDMMC_CLKCR_PWRSAV BIT(12)
#define SDMMC_CLKCR_WIDBUS_4 BIT(14)
#define SDMMC_CLKCR_WIDBUS_8 BIT(15)
#define SDMMC_CLKCR_NEGEDGE BIT(16)
#define SDMMC_CLKCR_HWFC_EN BIT(17)
#define SDMMC_CLKCR_DDR BIT(18)
#define SDMMC_CLKCR_BUSSPEED BIT(19)
#define SDMMC_CLKCR_SELCLKRX_MASK GENMASK(21, 20)
#define SDMMC_CLKCR_SELCLKRX_CK 0
#define SDMMC_CLKCR_SELCLKRX_CKIN BIT(20)
#define SDMMC_CLKCR_SELCLKRX_FBCK BIT(21)
/* SDMMC_CMD register */
#define SDMMC_CMD_CMDINDEX GENMASK(5, 0)
#define SDMMC_CMD_CMDTRANS BIT(6)
#define SDMMC_CMD_CMDSTOP BIT(7)
#define SDMMC_CMD_WAITRESP GENMASK(9, 8)
#define SDMMC_CMD_WAITRESP_0 BIT(8)
#define SDMMC_CMD_WAITRESP_1 BIT(9)
#define SDMMC_CMD_WAITINT BIT(10)
#define SDMMC_CMD_WAITPEND BIT(11)
#define SDMMC_CMD_CPSMEN BIT(12)
#define SDMMC_CMD_DTHOLD BIT(13)
#define SDMMC_CMD_BOOTMODE BIT(14)
#define SDMMC_CMD_BOOTEN BIT(15)
#define SDMMC_CMD_CMDSUSPEND BIT(16)
/* SDMMC_DCTRL register */
#define SDMMC_DCTRL_DTEN BIT(0)
#define SDMMC_DCTRL_DTDIR BIT(1)
#define SDMMC_DCTRL_DTMODE GENMASK(3, 2)
#define SDMMC_DCTRL_DBLOCKSIZE GENMASK(7, 4)
#define SDMMC_DCTRL_DBLOCKSIZE_SHIFT 4
#define SDMMC_DCTRL_RWSTART BIT(8)
#define SDMMC_DCTRL_RWSTOP BIT(9)
#define SDMMC_DCTRL_RWMOD BIT(10)
#define SDMMC_DCTRL_SDMMCEN BIT(11)
#define SDMMC_DCTRL_BOOTACKEN BIT(12)
#define SDMMC_DCTRL_FIFORST BIT(13)
/* SDMMC_STA register */
#define SDMMC_STA_CCRCFAIL BIT(0)
#define SDMMC_STA_DCRCFAIL BIT(1)
#define SDMMC_STA_CTIMEOUT BIT(2)
#define SDMMC_STA_DTIMEOUT BIT(3)
#define SDMMC_STA_TXUNDERR BIT(4)
#define SDMMC_STA_RXOVERR BIT(5)
#define SDMMC_STA_CMDREND BIT(6)
#define SDMMC_STA_CMDSENT BIT(7)
#define SDMMC_STA_DATAEND BIT(8)
#define SDMMC_STA_DHOLD BIT(9)
#define SDMMC_STA_DBCKEND BIT(10)
#define SDMMC_STA_DABORT BIT(11)
#define SDMMC_STA_DPSMACT BIT(12)
#define SDMMC_STA_CPSMACT BIT(13)
#define SDMMC_STA_TXFIFOHE BIT(14)
#define SDMMC_STA_RXFIFOHF BIT(15)
#define SDMMC_STA_TXFIFOF BIT(16)
#define SDMMC_STA_RXFIFOF BIT(17)
#define SDMMC_STA_TXFIFOE BIT(18)
#define SDMMC_STA_RXFIFOE BIT(19)
#define SDMMC_STA_BUSYD0 BIT(20)
#define SDMMC_STA_BUSYD0END BIT(21)
#define SDMMC_STA_SDMMCIT BIT(22)
#define SDMMC_STA_ACKFAIL BIT(23)
#define SDMMC_STA_ACKTIMEOUT BIT(24)
#define SDMMC_STA_VSWEND BIT(25)
#define SDMMC_STA_CKSTOP BIT(26)
#define SDMMC_STA_IDMATE BIT(27)
#define SDMMC_STA_IDMABTC BIT(28)
/* SDMMC_ICR register */
#define SDMMC_ICR_CCRCFAILC BIT(0)
#define SDMMC_ICR_DCRCFAILC BIT(1)
#define SDMMC_ICR_CTIMEOUTC BIT(2)
#define SDMMC_ICR_DTIMEOUTC BIT(3)
#define SDMMC_ICR_TXUNDERRC BIT(4)
#define SDMMC_ICR_RXOVERRC BIT(5)
#define SDMMC_ICR_CMDRENDC BIT(6)
#define SDMMC_ICR_CMDSENTC BIT(7)
#define SDMMC_ICR_DATAENDC BIT(8)
#define SDMMC_ICR_DHOLDC BIT(9)
#define SDMMC_ICR_DBCKENDC BIT(10)
#define SDMMC_ICR_DABORTC BIT(11)
#define SDMMC_ICR_BUSYD0ENDC BIT(21)
#define SDMMC_ICR_SDMMCITC BIT(22)
#define SDMMC_ICR_ACKFAILC BIT(23)
#define SDMMC_ICR_ACKTIMEOUTC BIT(24)
#define SDMMC_ICR_VSWENDC BIT(25)
#define SDMMC_ICR_CKSTOPC BIT(26)
#define SDMMC_ICR_IDMATEC BIT(27)
#define SDMMC_ICR_IDMABTCC BIT(28)
#define SDMMC_ICR_STATIC_FLAGS ((GENMASK(28, 21)) | (GENMASK(11, 0)))
/* SDMMC_MASK register */
#define SDMMC_MASK_CCRCFAILIE BIT(0)
#define SDMMC_MASK_DCRCFAILIE BIT(1)
#define SDMMC_MASK_CTIMEOUTIE BIT(2)
#define SDMMC_MASK_DTIMEOUTIE BIT(3)
#define SDMMC_MASK_TXUNDERRIE BIT(4)
#define SDMMC_MASK_RXOVERRIE BIT(5)
#define SDMMC_MASK_CMDRENDIE BIT(6)
#define SDMMC_MASK_CMDSENTIE BIT(7)
#define SDMMC_MASK_DATAENDIE BIT(8)
#define SDMMC_MASK_DHOLDIE BIT(9)
#define SDMMC_MASK_DBCKENDIE BIT(10)
#define SDMMC_MASK_DABORTIE BIT(11)
#define SDMMC_MASK_TXFIFOHEIE BIT(14)
#define SDMMC_MASK_RXFIFOHFIE BIT(15)
#define SDMMC_MASK_RXFIFOFIE BIT(17)
#define SDMMC_MASK_TXFIFOEIE BIT(18)
#define SDMMC_MASK_BUSYD0ENDIE BIT(21)
#define SDMMC_MASK_SDMMCITIE BIT(22)
#define SDMMC_MASK_ACKFAILIE BIT(23)
#define SDMMC_MASK_ACKTIMEOUTIE BIT(24)
#define SDMMC_MASK_VSWENDIE BIT(25)
#define SDMMC_MASK_CKSTOPIE BIT(26)
#define SDMMC_MASK_IDMABTCIE BIT(28)
/* SDMMC_IDMACTRL register */
#define SDMMC_IDMACTRL_IDMAEN BIT(0)
#define SDMMC_CMD_TIMEOUT 0xFFFFFFFF
static void stm32_sdmmc2_start_data(struct stm32_sdmmc2_priv *priv,
struct mmc_data *data,
struct stm32_sdmmc2_ctx *ctx)
{
u32 data_ctrl, idmabase0;
/* Configure the SDMMC DPSM (Data Path State Machine) */
data_ctrl = (__ilog2(data->blocksize) <<
SDMMC_DCTRL_DBLOCKSIZE_SHIFT) &
SDMMC_DCTRL_DBLOCKSIZE;
if (data->flags & MMC_DATA_READ) {
data_ctrl |= SDMMC_DCTRL_DTDIR;
idmabase0 = (u32)data->dest;
} else {
idmabase0 = (u32)data->src;
}
/* Set the SDMMC Data TimeOut value */
writel(SDMMC_CMD_TIMEOUT, priv->base + SDMMC_DTIMER);
/* Set the SDMMC DataLength value */
writel(ctx->data_length, priv->base + SDMMC_DLEN);
/* Write to SDMMC DCTRL */
writel(data_ctrl, priv->base + SDMMC_DCTRL);
/* Cache align */
ctx->cache_start = rounddown(idmabase0, ARCH_DMA_MINALIGN);
ctx->cache_end = roundup(idmabase0 + ctx->data_length,
ARCH_DMA_MINALIGN);
/*
* Flush data cache before DMA start (clean and invalidate)
* Clean also needed for read
* Avoid issue on buffer not cached-aligned
*/
flush_dcache_range(ctx->cache_start, ctx->cache_end);
/* Enable internal DMA */
writel(idmabase0, priv->base + SDMMC_IDMABASE0);
writel(SDMMC_IDMACTRL_IDMAEN, priv->base + SDMMC_IDMACTRL);
}
static void stm32_sdmmc2_start_cmd(struct stm32_sdmmc2_priv *priv,
struct mmc_cmd *cmd, u32 cmd_param)
{
if (readl(priv->base + SDMMC_ARG) & SDMMC_CMD_CPSMEN)
writel(0, priv->base + SDMMC_ARG);
cmd_param |= cmd->cmdidx | SDMMC_CMD_CPSMEN;
if (cmd->resp_type & MMC_RSP_PRESENT) {
if (cmd->resp_type & MMC_RSP_136)
cmd_param |= SDMMC_CMD_WAITRESP;
else if (cmd->resp_type & MMC_RSP_CRC)
cmd_param |= SDMMC_CMD_WAITRESP_0;
else
cmd_param |= SDMMC_CMD_WAITRESP_1;
}
/* Clear flags */
writel(SDMMC_ICR_STATIC_FLAGS, priv->base + SDMMC_ICR);
/* Set SDMMC argument value */
writel(cmd->cmdarg, priv->base + SDMMC_ARG);
/* Set SDMMC command parameters */
writel(cmd_param, priv->base + SDMMC_CMD);
}
static int stm32_sdmmc2_end_cmd(struct stm32_sdmmc2_priv *priv,
struct mmc_cmd *cmd,
struct stm32_sdmmc2_ctx *ctx)
{
u32 mask = SDMMC_STA_CTIMEOUT;
u32 status;
int ret;
if (cmd->resp_type & MMC_RSP_PRESENT) {
mask |= SDMMC_STA_CMDREND;
if (cmd->resp_type & MMC_RSP_CRC)
mask |= SDMMC_STA_CCRCFAIL;
} else {
mask |= SDMMC_STA_CMDSENT;
}
/* Polling status register */
ret = readl_poll_timeout(priv->base + SDMMC_STA, status, status & mask,
10000);
if (ret < 0) {
debug("%s: timeout reading SDMMC_STA register\n", __func__);
ctx->dpsm_abort = true;
return ret;
}
/* Check status */
if (status & SDMMC_STA_CTIMEOUT) {
debug("%s: error SDMMC_STA_CTIMEOUT (0x%x) for cmd %d\n",
__func__, status, cmd->cmdidx);
ctx->dpsm_abort = true;
return -ETIMEDOUT;
}
if (status & SDMMC_STA_CCRCFAIL && cmd->resp_type & MMC_RSP_CRC) {
debug("%s: error SDMMC_STA_CCRCFAIL (0x%x) for cmd %d\n",
__func__, status, cmd->cmdidx);
ctx->dpsm_abort = true;
return -EILSEQ;
}
if (status & SDMMC_STA_CMDREND && cmd->resp_type & MMC_RSP_PRESENT) {
cmd->response[0] = readl(priv->base + SDMMC_RESP1);
if (cmd->resp_type & MMC_RSP_136) {
cmd->response[1] = readl(priv->base + SDMMC_RESP2);
cmd->response[2] = readl(priv->base + SDMMC_RESP3);
cmd->response[3] = readl(priv->base + SDMMC_RESP4);
}
}
return 0;
}
static int stm32_sdmmc2_end_data(struct stm32_sdmmc2_priv *priv,
struct mmc_cmd *cmd,
struct mmc_data *data,
struct stm32_sdmmc2_ctx *ctx)
{
u32 mask = SDMMC_STA_DCRCFAIL | SDMMC_STA_DTIMEOUT |
SDMMC_STA_IDMATE | SDMMC_STA_DATAEND;
u32 status;
if (data->flags & MMC_DATA_READ)
mask |= SDMMC_STA_RXOVERR;
else
mask |= SDMMC_STA_TXUNDERR;
status = readl(priv->base + SDMMC_STA);
while (!(status & mask))
status = readl(priv->base + SDMMC_STA);
/*
* Need invalidate the dcache again to avoid any
* cache-refill during the DMA operations (pre-fetching)
*/
if (data->flags & MMC_DATA_READ)
invalidate_dcache_range(ctx->cache_start, ctx->cache_end);
if (status & SDMMC_STA_DCRCFAIL) {
debug("%s: error SDMMC_STA_DCRCFAIL (0x%x) for cmd %d\n",
__func__, status, cmd->cmdidx);
if (readl(priv->base + SDMMC_DCOUNT))
ctx->dpsm_abort = true;
return -EILSEQ;
}
if (status & SDMMC_STA_DTIMEOUT) {
debug("%s: error SDMMC_STA_DTIMEOUT (0x%x) for cmd %d\n",
__func__, status, cmd->cmdidx);
ctx->dpsm_abort = true;
return -ETIMEDOUT;
}
if (status & SDMMC_STA_TXUNDERR) {
debug("%s: error SDMMC_STA_TXUNDERR (0x%x) for cmd %d\n",
__func__, status, cmd->cmdidx);
ctx->dpsm_abort = true;
return -EIO;
}
if (status & SDMMC_STA_RXOVERR) {
debug("%s: error SDMMC_STA_RXOVERR (0x%x) for cmd %d\n",
__func__, status, cmd->cmdidx);
ctx->dpsm_abort = true;
return -EIO;
}
if (status & SDMMC_STA_IDMATE) {
debug("%s: error SDMMC_STA_IDMATE (0x%x) for cmd %d\n",
__func__, status, cmd->cmdidx);
ctx->dpsm_abort = true;
return -EIO;
}
return 0;
}
static int stm32_sdmmc2_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
struct mmc_data *data)
{
struct stm32_sdmmc2_priv *priv = dev_get_priv(dev);
struct stm32_sdmmc2_ctx ctx;
u32 cmdat = data ? SDMMC_CMD_CMDTRANS : 0;
int ret, retry = 3;
retry_cmd:
ctx.data_length = 0;
ctx.dpsm_abort = false;
if (data) {
ctx.data_length = data->blocks * data->blocksize;
stm32_sdmmc2_start_data(priv, data, &ctx);
}
stm32_sdmmc2_start_cmd(priv, cmd, cmdat);
debug("%s: send cmd %d data: 0x%x @ 0x%x\n",
__func__, cmd->cmdidx,
data ? ctx.data_length : 0, (unsigned int)data);
ret = stm32_sdmmc2_end_cmd(priv, cmd, &ctx);
if (data && !ret)
ret = stm32_sdmmc2_end_data(priv, cmd, data, &ctx);
/* Clear flags */
writel(SDMMC_ICR_STATIC_FLAGS, priv->base + SDMMC_ICR);
if (data)
writel(0x0, priv->base + SDMMC_IDMACTRL);
/*
* To stop Data Path State Machine, a stop_transmission command
* shall be send on cmd or data errors.
*/
if (ctx.dpsm_abort && (cmd->cmdidx != MMC_CMD_STOP_TRANSMISSION)) {
struct mmc_cmd stop_cmd;
stop_cmd.cmdidx = MMC_CMD_STOP_TRANSMISSION;
stop_cmd.cmdarg = 0;
stop_cmd.resp_type = MMC_RSP_R1b;
debug("%s: send STOP command to abort dpsm treatments\n",
__func__);
stm32_sdmmc2_start_cmd(priv, &stop_cmd, SDMMC_CMD_CMDSTOP);
stm32_sdmmc2_end_cmd(priv, &stop_cmd, &ctx);
writel(SDMMC_ICR_STATIC_FLAGS, priv->base + SDMMC_ICR);
}
if ((ret != -ETIMEDOUT) && (ret != 0) && retry) {
printf("%s: cmd %d failed, retrying ...\n",
__func__, cmd->cmdidx);
retry--;
goto retry_cmd;
}
debug("%s: end for CMD %d, ret = %d\n", __func__, cmd->cmdidx, ret);
return ret;
}
static void stm32_sdmmc2_pwron(struct stm32_sdmmc2_priv *priv)
{
/* Reset */
reset_assert(&priv->reset_ctl);
udelay(2);
reset_deassert(&priv->reset_ctl);
udelay(1000);
/* Set Power State to ON */
writel(SDMMC_POWER_PWRCTRL | priv->pwr_reg_msk, priv->base + SDMMC_POWER);
/*
* 1ms: required power up waiting time before starting the
* SD initialization sequence
*/
udelay(1000);
}
#define IS_RISING_EDGE(reg) (reg & SDMMC_CLKCR_NEGEDGE ? 0 : 1)
static int stm32_sdmmc2_set_ios(struct udevice *dev)
{
struct mmc *mmc = mmc_get_mmc_dev(dev);
struct stm32_sdmmc2_priv *priv = dev_get_priv(dev);
struct stm32_sdmmc2_plat *plat = dev_get_platdata(dev);
struct mmc_config *cfg = &plat->cfg;
u32 desired = mmc->clock;
u32 sys_clock = clk_get_rate(&priv->clk);
u32 clk = 0;
debug("%s: bus_with = %d, clock = %d\n", __func__,
mmc->bus_width, mmc->clock);
if ((mmc->bus_width == 1) && (desired == cfg->f_min))
stm32_sdmmc2_pwron(priv);
/*
* clk_div = 0 => command and data generated on SDMMCCLK falling edge
* clk_div > 0 and NEGEDGE = 0 => command and data generated on
* SDMMCCLK rising edge
* clk_div > 0 and NEGEDGE = 1 => command and data generated on
* SDMMCCLK falling edge
*/
if (desired && ((sys_clock > desired) ||
IS_RISING_EDGE(priv->clk_reg_msk))) {
clk = DIV_ROUND_UP(sys_clock, 2 * desired);
if (clk > SDMMC_CLKCR_CLKDIV_MAX)
clk = SDMMC_CLKCR_CLKDIV_MAX;
}
if (mmc->bus_width == 4)
clk |= SDMMC_CLKCR_WIDBUS_4;
if (mmc->bus_width == 8)
clk |= SDMMC_CLKCR_WIDBUS_8;
writel(clk | priv->clk_reg_msk | SDMMC_CLKCR_HWFC_EN,
priv->base + SDMMC_CLKCR);
return 0;
}
static int stm32_sdmmc2_getcd(struct udevice *dev)
{
struct stm32_sdmmc2_priv *priv = dev_get_priv(dev);
debug("stm32_sdmmc2_getcd called\n");
if (dm_gpio_is_valid(&priv->cd_gpio))
return dm_gpio_get_value(&priv->cd_gpio);
return 1;
}
static const struct dm_mmc_ops stm32_sdmmc2_ops = {
.send_cmd = stm32_sdmmc2_send_cmd,
.set_ios = stm32_sdmmc2_set_ios,
.get_cd = stm32_sdmmc2_getcd,
};
static int stm32_sdmmc2_probe(struct udevice *dev)
{
struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
struct stm32_sdmmc2_plat *plat = dev_get_platdata(dev);
struct stm32_sdmmc2_priv *priv = dev_get_priv(dev);
struct mmc_config *cfg = &plat->cfg;
int ret;
priv->base = dev_read_addr(dev);
if (priv->base == FDT_ADDR_T_NONE)
return -EINVAL;
if (dev_read_bool(dev, "st,negedge"))
priv->clk_reg_msk |= SDMMC_CLKCR_NEGEDGE;
if (dev_read_bool(dev, "st,dirpol"))
priv->pwr_reg_msk |= SDMMC_POWER_DIRPOL;
if (dev_read_bool(dev, "st,pin-ckin"))
priv->clk_reg_msk |= SDMMC_CLKCR_SELCLKRX_CKIN;
ret = clk_get_by_index(dev, 0, &priv->clk);
if (ret)
return ret;
ret = clk_enable(&priv->clk);
if (ret)
goto clk_free;
ret = reset_get_by_index(dev, 0, &priv->reset_ctl);
if (ret)
goto clk_disable;
gpio_request_by_name(dev, "cd-gpios", 0, &priv->cd_gpio,
GPIOD_IS_IN);
cfg->f_min = 400000;
cfg->f_max = dev_read_u32_default(dev, "max-frequency", 52000000);
cfg->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
cfg->b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
cfg->name = "STM32 SDMMC2";
cfg->host_caps = 0;
if (cfg->f_max > 25000000)
cfg->host_caps |= MMC_MODE_HS_52MHz | MMC_MODE_HS;
switch (dev_read_u32_default(dev, "bus-width", 1)) {
case 8:
cfg->host_caps |= MMC_MODE_8BIT;
case 4:
cfg->host_caps |= MMC_MODE_4BIT;
break;
case 1:
break;
default:
pr_err("invalid \"bus-width\" property, force to 1\n");
}
upriv->mmc = &plat->mmc;
return 0;
clk_disable:
clk_disable(&priv->clk);
clk_free:
clk_free(&priv->clk);
return ret;
}
int stm32_sdmmc_bind(struct udevice *dev)
{
struct stm32_sdmmc2_plat *plat = dev_get_platdata(dev);
return mmc_bind(dev, &plat->mmc, &plat->cfg);
}
static const struct udevice_id stm32_sdmmc2_ids[] = {
{ .compatible = "st,stm32-sdmmc2" },
{ }
};
U_BOOT_DRIVER(stm32_sdmmc2) = {
.name = "stm32_sdmmc2",
.id = UCLASS_MMC,
.of_match = stm32_sdmmc2_ids,
.ops = &stm32_sdmmc2_ops,
.probe = stm32_sdmmc2_probe,
.bind = stm32_sdmmc_bind,
.priv_auto_alloc_size = sizeof(struct stm32_sdmmc2_priv),
.platdata_auto_alloc_size = sizeof(struct stm32_sdmmc2_plat),
};
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