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mmc: uniphier-sd: Add control of UHS mode using SD interface logic

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Transition of UHS mode needs to control the register in SD interface
logic. Add access to the register in the logic using the regmap from
"socionext,syscon-uhs-mode" property.

Define the start_signal_voltage_switch function only if UHS mode is
available.

Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Link: https://lore.kernel.org/r/20230125010201.28246-3-hayashi.kunihiko@socionext.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Kunihiko Hayashi 2023-01-25 10:01:58 +09:00 committed by Ulf Hansson
parent 388dcd9505
commit 1c325ed9f9
1 changed files with 56 additions and 5 deletions
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61
drivers/mmc/host/uniphier-sd.c
View file

@ -8,6 +8,7 @@
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/mfd/syscon.h>
#include <linux/mfd/tmio.h>
#include <linux/mmc/host.h>
#include <linux/module.h>
@ -15,6 +16,7 @@
#include <linux/of_device.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/reset.h>
#include "tmio_mmc.h"
@ -48,6 +50,11 @@
#define UNIPHIER_SD_DMA_ADDR_L 0x440
#define UNIPHIER_SD_DMA_ADDR_H 0x444
/* SD control */
#define UNIPHIER_SDCTRL_CHOFFSET 0x200
#define UNIPHIER_SDCTRL_MODE 0x30
#define UNIPHIER_SDCTRL_MODE_UHS1MOD BIT(15)
/*
* IP is extended to support various features: built-in DMA engine,
* 1/1024 divisor, etc.
@ -66,6 +73,8 @@ struct uniphier_sd_priv {
struct reset_control *rst_hw;
struct dma_chan *chan;
enum dma_data_direction dma_dir;
struct regmap *sdctrl_regmap;
u32 sdctrl_ch;
unsigned long clk_rate;
unsigned long caps;
};
@ -420,6 +429,23 @@ static void uniphier_sd_hw_reset(struct mmc_host *mmc)
usleep_range(300, 1000);
}
static void uniphier_sd_uhs_enable(struct tmio_mmc_host *host, bool uhs_en)
{
struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
unsigned int offset;
u32 val;
if (!(host->mmc->caps & MMC_CAP_UHS))
return;
val = (uhs_en) ? UNIPHIER_SDCTRL_MODE_UHS1MOD : 0;
offset = UNIPHIER_SDCTRL_CHOFFSET * priv->sdctrl_ch
+ UNIPHIER_SDCTRL_MODE;
regmap_write_bits(priv->sdctrl_regmap, offset,
UNIPHIER_SDCTRL_MODE_UHS1MOD, val);
}
static void uniphier_sd_set_clock(struct tmio_mmc_host *host,
unsigned int clock)
{
@ -500,14 +526,17 @@ static int uniphier_sd_start_signal_voltage_switch(struct mmc_host *mmc,
struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
struct pinctrl_state *pinstate = NULL;
u32 val, tmp;
bool uhs_en;
switch (ios->signal_voltage) {
case MMC_SIGNAL_VOLTAGE_330:
val = UNIPHIER_SD_VOLT_330;
uhs_en = false;
break;
case MMC_SIGNAL_VOLTAGE_180:
val = UNIPHIER_SD_VOLT_180;
pinstate = priv->pinstate_uhs;
uhs_en = true;
break;
default:
return -ENOTSUPP;
@ -523,12 +552,19 @@ static int uniphier_sd_start_signal_voltage_switch(struct mmc_host *mmc,
else
pinctrl_select_default_state(mmc_dev(mmc));
uniphier_sd_uhs_enable(host, uhs_en);
return 0;
}
static int uniphier_sd_uhs_init(struct tmio_mmc_host *host,
struct uniphier_sd_priv *priv)
static int uniphier_sd_uhs_init(struct tmio_mmc_host *host)
{
struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
struct device *dev = &host->pdev->dev;
struct device_node *np = dev->of_node;
struct of_phandle_args args;
int ret;
priv->pinctrl = devm_pinctrl_get(mmc_dev(host->mmc));
if (IS_ERR(priv->pinctrl))
return PTR_ERR(priv->pinctrl);
@ -537,8 +573,20 @@ static int uniphier_sd_uhs_init(struct tmio_mmc_host *host,
if (IS_ERR(priv->pinstate_uhs))
return PTR_ERR(priv->pinstate_uhs);
host->ops.start_signal_voltage_switch =
uniphier_sd_start_signal_voltage_switch;
ret = of_parse_phandle_with_fixed_args(np,
"socionext,syscon-uhs-mode",
1, 0, &args);
if (ret) {
dev_err(dev, "Can't get syscon-uhs-mode property\n");
return ret;
}
priv->sdctrl_regmap = syscon_node_to_regmap(args.np);
of_node_put(args.np);
if (IS_ERR(priv->sdctrl_regmap)) {
dev_err(dev, "Can't map syscon-uhs-mode\n");
return PTR_ERR(priv->sdctrl_regmap);
}
priv->sdctrl_ch = args.args[0];
return 0;
}
@ -601,12 +649,15 @@ static int uniphier_sd_probe(struct platform_device *pdev)
}
if (host->mmc->caps & MMC_CAP_UHS) {
ret = uniphier_sd_uhs_init(host, priv);
ret = uniphier_sd_uhs_init(host);
if (ret) {
dev_warn(dev,
"failed to setup UHS (error %d). Disabling UHS.",
ret);
host->mmc->caps &= ~MMC_CAP_UHS;
} else {
host->ops.start_signal_voltage_switch =
uniphier_sd_start_signal_voltage_switch;
}
}