u-boot/drivers/mmc/stm32_sdmmc2.c
Marek Vasut 8e5266eefd mmc: stm32_sdmmc2: Add support for probing bus voltage level translator
Add support for testing whether bus voltage level translator is present
and operational. This is useful on systems where the bus voltage level
translator is optional, as the translator can be auto-detected by the
driver and the feedback clock functionality can be disabled if it is
not present.

The translator test sets CMD high to avoid interfering with a card, and
then verifies whether signal set on CK is detected on CKIN. If the signal
is detected, translator is present, otherwise the CKIN feedback clock are
disabled.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Patrice Chotard <patrice.chotard@foss.st.com>
Cc: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Yann Gautier <yann.gautier@foss.st.com>
2021-11-30 16:43:28 +01:00

787 lines
21 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2017, STMicroelectronics - All Rights Reserved
* Author(s): Patrice Chotard, <patrice.chotard@foss.st.com> for STMicroelectronics.
*/
#define LOG_CATEGORY UCLASS_MMC
#include <common.h>
#include <clk.h>
#include <cpu_func.h>
#include <dm.h>
#include <fdtdec.h>
#include <log.h>
#include <malloc.h>
#include <asm/bitops.h>
#include <asm/cache.h>
#include <dm/device_compat.h>
#include <dm/pinctrl.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/libfdt.h>
#include <mmc.h>
#include <reset.h>
#include <asm/io.h>
#include <asm/gpio.h>
#include <linux/iopoll.h>
#include <watchdog.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_MASK GENMASK(1, 0)
#define SDMMC_POWER_PWRCTRL_OFF 0
#define SDMMC_POWER_PWRCTRL_CYCLE 2
#define SDMMC_POWER_PWRCTRL_ON 3
#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
#define SDMMC_BUSYD0END_TIMEOUT_US 2000000
static void stm32_sdmmc2_start_data(struct udevice *dev,
struct mmc_data *data,
struct stm32_sdmmc2_ctx *ctx)
{
struct stm32_sdmmc2_priv *priv = dev_get_priv(dev);
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 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 udevice *dev,
struct mmc_cmd *cmd, u32 cmd_param,
struct stm32_sdmmc2_ctx *ctx)
{
struct stm32_sdmmc2_priv *priv = dev_get_priv(dev);
u32 timeout = 0;
if (readl(priv->base + SDMMC_CMD) & SDMMC_CMD_CPSMEN)
writel(0, priv->base + SDMMC_CMD);
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;
}
/*
* SDMMC_DTIME must be set in two case:
* - on data transfert.
* - on busy request.
* If not done or too short, the dtimeout flag occurs and DPSM stays
* enabled/busy and waits for abort (stop transmission cmd).
* Next data command is not possible whereas DPSM is activated.
*/
if (ctx->data_length) {
timeout = SDMMC_CMD_TIMEOUT;
} else {
writel(0, priv->base + SDMMC_DCTRL);
if (cmd->resp_type & MMC_RSP_BUSY)
timeout = SDMMC_CMD_TIMEOUT;
}
/* Set the SDMMC Data TimeOut value */
writel(timeout, priv->base + SDMMC_DTIMER);
/* 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 udevice *dev,
struct mmc_cmd *cmd,
struct stm32_sdmmc2_ctx *ctx)
{
struct stm32_sdmmc2_priv *priv = dev_get_priv(dev);
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) {
dev_dbg(dev, "timeout reading SDMMC_STA register\n");
ctx->dpsm_abort = true;
return ret;
}
/* Check status */
if (status & SDMMC_STA_CTIMEOUT) {
dev_dbg(dev, "error SDMMC_STA_CTIMEOUT (0x%x) for cmd %d\n",
status, cmd->cmdidx);
ctx->dpsm_abort = true;
return -ETIMEDOUT;
}
if (status & SDMMC_STA_CCRCFAIL && cmd->resp_type & MMC_RSP_CRC) {
dev_dbg(dev, "error SDMMC_STA_CCRCFAIL (0x%x) for cmd %d\n",
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);
}
/* Wait for BUSYD0END flag if busy status is detected */
if (cmd->resp_type & MMC_RSP_BUSY &&
status & SDMMC_STA_BUSYD0) {
mask = SDMMC_STA_DTIMEOUT | SDMMC_STA_BUSYD0END;
/* Polling status register */
ret = readl_poll_timeout(priv->base + SDMMC_STA,
status, status & mask,
SDMMC_BUSYD0END_TIMEOUT_US);
if (ret < 0) {
dev_dbg(dev, "timeout reading SDMMC_STA\n");
ctx->dpsm_abort = true;
return ret;
}
if (status & SDMMC_STA_DTIMEOUT) {
dev_dbg(dev,
"error SDMMC_STA_DTIMEOUT (0x%x)\n",
status);
ctx->dpsm_abort = true;
return -ETIMEDOUT;
}
}
}
return 0;
}
static int stm32_sdmmc2_end_data(struct udevice *dev,
struct mmc_cmd *cmd,
struct mmc_data *data,
struct stm32_sdmmc2_ctx *ctx)
{
struct stm32_sdmmc2_priv *priv = dev_get_priv(dev);
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) {
dev_dbg(dev, "error SDMMC_STA_DCRCFAIL (0x%x) for cmd %d\n",
status, cmd->cmdidx);
if (readl(priv->base + SDMMC_DCOUNT))
ctx->dpsm_abort = true;
return -EILSEQ;
}
if (status & SDMMC_STA_DTIMEOUT) {
dev_dbg(dev, "error SDMMC_STA_DTIMEOUT (0x%x) for cmd %d\n",
status, cmd->cmdidx);
ctx->dpsm_abort = true;
return -ETIMEDOUT;
}
if (status & SDMMC_STA_TXUNDERR) {
dev_dbg(dev, "error SDMMC_STA_TXUNDERR (0x%x) for cmd %d\n",
status, cmd->cmdidx);
ctx->dpsm_abort = true;
return -EIO;
}
if (status & SDMMC_STA_RXOVERR) {
dev_dbg(dev, "error SDMMC_STA_RXOVERR (0x%x) for cmd %d\n",
status, cmd->cmdidx);
ctx->dpsm_abort = true;
return -EIO;
}
if (status & SDMMC_STA_IDMATE) {
dev_dbg(dev, "error SDMMC_STA_IDMATE (0x%x) for cmd %d\n",
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;
WATCHDOG_RESET();
retry_cmd:
ctx.data_length = 0;
ctx.dpsm_abort = false;
if (data) {
ctx.data_length = data->blocks * data->blocksize;
stm32_sdmmc2_start_data(dev, data, &ctx);
}
stm32_sdmmc2_start_cmd(dev, cmd, cmdat, &ctx);
dev_dbg(dev, "send cmd %d data: 0x%x @ 0x%x\n",
cmd->cmdidx, data ? ctx.data_length : 0, (unsigned int)data);
ret = stm32_sdmmc2_end_cmd(dev, cmd, &ctx);
if (data && !ret)
ret = stm32_sdmmc2_end_data(dev, 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;
dev_dbg(dev, "send STOP command to abort dpsm treatments\n");
ctx.data_length = 0;
stm32_sdmmc2_start_cmd(dev, &stop_cmd,
SDMMC_CMD_CMDSTOP, &ctx);
stm32_sdmmc2_end_cmd(dev, &stop_cmd, &ctx);
writel(SDMMC_ICR_STATIC_FLAGS, priv->base + SDMMC_ICR);
}
if ((ret != -ETIMEDOUT) && (ret != 0) && retry) {
dev_err(dev, "cmd %d failed, retrying ...\n", cmd->cmdidx);
retry--;
goto retry_cmd;
}
dev_dbg(dev, "end for CMD %d, ret = %d\n", cmd->cmdidx, ret);
return ret;
}
/*
* Reset the SDMMC with the RCC.SDMMCxRST register bit.
* This will reset the SDMMC to the reset state and the CPSM and DPSM
* to the Idle state. SDMMC is disabled, Signals Hiz.
*/
static void stm32_sdmmc2_reset(struct stm32_sdmmc2_priv *priv)
{
/* Reset */
reset_assert(&priv->reset_ctl);
udelay(2);
reset_deassert(&priv->reset_ctl);
/* init the needed SDMMC register after reset */
writel(priv->pwr_reg_msk, priv->base + SDMMC_POWER);
}
/*
* Set the SDMMC in power-cycle state.
* This will make that the SDMMC_D[7:0],
* SDMMC_CMD and SDMMC_CK are driven low, to prevent the card from being
* supplied through the signal lines.
*/
static void stm32_sdmmc2_pwrcycle(struct stm32_sdmmc2_priv *priv)
{
if ((readl(priv->base + SDMMC_POWER) & SDMMC_POWER_PWRCTRL_MASK) ==
SDMMC_POWER_PWRCTRL_CYCLE)
return;
stm32_sdmmc2_reset(priv);
}
/*
* set the SDMMC state Power-on: the card is clocked
* manage the SDMMC state control:
* Reset => Power-Cycle => Power-Off => Power
* PWRCTRL=10 PWCTRL=00 PWCTRL=11
*/
static void stm32_sdmmc2_pwron(struct stm32_sdmmc2_priv *priv)
{
u32 pwrctrl =
readl(priv->base + SDMMC_POWER) & SDMMC_POWER_PWRCTRL_MASK;
if (pwrctrl == SDMMC_POWER_PWRCTRL_ON)
return;
/* warning: same PWRCTRL value after reset and for power-off state
* it is the reset state here = the only managed by the driver
*/
if (pwrctrl == SDMMC_POWER_PWRCTRL_OFF) {
writel(SDMMC_POWER_PWRCTRL_CYCLE | priv->pwr_reg_msk,
priv->base + SDMMC_POWER);
}
/*
* the remaining case is SDMMC_POWER_PWRCTRL_CYCLE
* switch to Power-Off state: SDMCC disable, signals drive 1
*/
writel(SDMMC_POWER_PWRCTRL_OFF | priv->pwr_reg_msk,
priv->base + SDMMC_POWER);
/* After the 1ms delay set the SDMMC to power-on */
mdelay(1);
writel(SDMMC_POWER_PWRCTRL_ON | priv->pwr_reg_msk,
priv->base + SDMMC_POWER);
/* during the first 74 SDMMC_CK cycles the SDMMC is still disabled. */
}
#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);
u32 desired = mmc->clock;
u32 sys_clock = clk_get_rate(&priv->clk);
u32 clk = 0;
dev_dbg(dev, "bus_with = %d, clock = %d\n",
mmc->bus_width, mmc->clock);
if (mmc->clk_disable)
stm32_sdmmc2_pwrcycle(priv);
else
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);
dev_dbg(dev, "%s called\n", __func__);
if (dm_gpio_is_valid(&priv->cd_gpio))
return dm_gpio_get_value(&priv->cd_gpio);
return 1;
}
static int stm32_sdmmc2_host_power_cycle(struct udevice *dev)
{
struct stm32_sdmmc2_priv *priv = dev_get_priv(dev);
writel(SDMMC_POWER_PWRCTRL_CYCLE | priv->pwr_reg_msk,
priv->base + SDMMC_POWER);
return 0;
}
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,
.host_power_cycle = stm32_sdmmc2_host_power_cycle,
};
static int stm32_sdmmc2_probe_level_translator(struct udevice *dev)
{
struct stm32_sdmmc2_priv *priv = dev_get_priv(dev);
struct gpio_desc cmd_gpio;
struct gpio_desc ck_gpio;
struct gpio_desc ckin_gpio;
int clk_hi, clk_lo, ret;
/*
* Assume the level translator is present if st,use-ckin is set.
* This is to cater for DTs which do not implement this test.
*/
priv->clk_reg_msk |= SDMMC_CLKCR_SELCLKRX_CKIN;
ret = gpio_request_by_name(dev, "st,cmd-gpios", 0, &cmd_gpio,
GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE);
if (ret)
goto exit_cmd;
ret = gpio_request_by_name(dev, "st,ck-gpios", 0, &ck_gpio,
GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE);
if (ret)
goto exit_ck;
ret = gpio_request_by_name(dev, "st,ckin-gpios", 0, &ckin_gpio,
GPIOD_IS_IN);
if (ret)
goto exit_ckin;
/* All GPIOs are valid, test whether level translator works */
/* Sample CKIN */
clk_hi = !!dm_gpio_get_value(&ckin_gpio);
/* Set CK low */
dm_gpio_set_value(&ck_gpio, 0);
/* Sample CKIN */
clk_lo = !!dm_gpio_get_value(&ckin_gpio);
/* Tristate all */
dm_gpio_set_dir_flags(&cmd_gpio, GPIOD_IS_IN);
dm_gpio_set_dir_flags(&ck_gpio, GPIOD_IS_IN);
/* Level translator is present if CK signal is propagated to CKIN */
if (!clk_hi || clk_lo)
priv->clk_reg_msk &= ~SDMMC_CLKCR_SELCLKRX_CKIN;
dm_gpio_free(dev, &ckin_gpio);
exit_ckin:
dm_gpio_free(dev, &ck_gpio);
exit_ck:
dm_gpio_free(dev, &cmd_gpio);
exit_cmd:
pinctrl_select_state(dev, "default");
return 0;
}
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_plat(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,neg-edge"))
priv->clk_reg_msk |= SDMMC_CLKCR_NEGEDGE;
if (dev_read_bool(dev, "st,sig-dir"))
priv->pwr_reg_msk |= SDMMC_POWER_DIRPOL;
if (dev_read_bool(dev, "st,use-ckin"))
stm32_sdmmc2_probe_level_translator(dev);
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->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 SD/MMC";
cfg->host_caps = 0;
cfg->f_max = 52000000;
mmc_of_parse(dev, cfg);
upriv->mmc = &plat->mmc;
/* SDMMC init */
stm32_sdmmc2_reset(priv);
return 0;
clk_disable:
clk_disable(&priv->clk);
clk_free:
clk_free(&priv->clk);
return ret;
}
static int stm32_sdmmc_bind(struct udevice *dev)
{
struct stm32_sdmmc2_plat *plat = dev_get_plat(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 = sizeof(struct stm32_sdmmc2_priv),
.plat_auto = sizeof(struct stm32_sdmmc2_plat),
};