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mmc: jz4740: Add support for vqmmc power supply

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Support enabling / disabling the vqmmc power supply if it was provided
by the firmware.

Provide the .start_signal_voltage_switch callback to change the voltage
of the external vqmmc power supply.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/20230131210229.68129-2-paul@crapouillou.net
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Paul Cercueil 2023-01-31 21:02:29 +00:00 committed by Ulf Hansson
parent fe3e137c6d
commit 152b5245e3
1 changed files with 37 additions and 1 deletions
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38
drivers/mmc/host/jz4740_mmc.c
View file

@ -21,6 +21,7 @@
#include <linux/of_device.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/scatterlist.h>
#include <asm/cacheflush.h>
@ -158,6 +159,8 @@ struct jz4740_mmc_host {
struct mmc_request *req;
struct mmc_command *cmd;
bool vqmmc_enabled;
unsigned long waiting;
uint32_t cmdat;
@ -935,6 +938,8 @@ static void jz4740_mmc_request(struct mmc_host *mmc, struct mmc_request *req)
static void jz4740_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct jz4740_mmc_host *host = mmc_priv(mmc);
int ret;
if (ios->clock)
jz4740_mmc_set_clock_rate(host, ios->clock);
@ -947,12 +952,25 @@ static void jz4740_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
clk_prepare_enable(host->clk);
break;
case MMC_POWER_ON:
if (!IS_ERR(mmc->supply.vqmmc) && !host->vqmmc_enabled) {
ret = regulator_enable(mmc->supply.vqmmc);
if (ret)
dev_err(&host->pdev->dev, "Failed to set vqmmc power!\n");
else
host->vqmmc_enabled = true;
}
break;
default:
case MMC_POWER_OFF:
if (!IS_ERR(mmc->supply.vmmc))
mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
if (!IS_ERR(mmc->supply.vqmmc) && host->vqmmc_enabled) {
regulator_disable(mmc->supply.vqmmc);
host->vqmmc_enabled = false;
}
clk_disable_unprepare(host->clk);
break;
default:
break;
}
switch (ios->bus_width) {
@ -978,6 +996,23 @@ static void jz4740_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_SDIO, enable);
}
static int jz4740_voltage_switch(struct mmc_host *mmc, struct mmc_ios *ios)
{
int ret;
/* vqmmc regulator is available */
if (!IS_ERR(mmc->supply.vqmmc)) {
ret = mmc_regulator_set_vqmmc(mmc, ios);
return ret < 0 ? ret : 0;
}
/* no vqmmc regulator, assume fixed regulator at 3/3.3V */
if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330)
return 0;
return -EINVAL;
}
static const struct mmc_host_ops jz4740_mmc_ops = {
.request = jz4740_mmc_request,
.pre_req = jz4740_mmc_pre_request,
@ -986,6 +1021,7 @@ static const struct mmc_host_ops jz4740_mmc_ops = {
.get_ro = mmc_gpio_get_ro,
.get_cd = mmc_gpio_get_cd,
.enable_sdio_irq = jz4740_mmc_enable_sdio_irq,
.start_signal_voltage_switch = jz4740_voltage_switch,
};
static const struct of_device_id jz4740_mmc_of_match[] = {