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nvmem: sc27xx: add sc2730 efuse support 

Add support to the new efuse IP which is integrated in the SC2730
which includes multiple blocks in a single chip.

Signed-off-by: Freeman Liu <freeman.liu@unisoc.com>
Signed-off-by: Chunyan Zhang <chunyan.zhang@unisoc.com>
Reviewed-by: Baolin Wang <baolin.wang7@gmail.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200722100705.7772-5-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Freeman Liu 2020-07-22 11:06:55 +01:00 committed by Greg Kroah-Hartman
parent 8356671574
commit 2eef018efb
1 changed files with 24 additions and 3 deletions
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27
drivers/nvmem/sc27xx-efuse.c
View File

@ -4,12 +4,14 @@
#include <linux/hwspinlock.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/nvmem-provider.h>
/* PMIC global registers definition */
#define SC27XX_MODULE_EN 0xc08
#define SC2730_MODULE_EN 0x1808
#define SC27XX_EFUSE_EN BIT(6)
/* Efuse controller registers definition */
@ -49,12 +51,29 @@
#define SC27XX_EFUSE_POLL_TIMEOUT 3000000
#define SC27XX_EFUSE_POLL_DELAY_US 10000
/*
* Since different PMICs of SC27xx series can have different
* address , we should save address in the device data structure.
*/
struct sc27xx_efuse_variant_data {
u32 module_en;
};
struct sc27xx_efuse {
struct device *dev;
struct regmap *regmap;
struct hwspinlock *hwlock;
struct mutex mutex;
u32 base;
const struct sc27xx_efuse_variant_data *var_data;
};
static const struct sc27xx_efuse_variant_data sc2731_edata = {
.module_en = SC27XX_MODULE_EN,
};
static const struct sc27xx_efuse_variant_data sc2730_edata = {
.module_en = SC2730_MODULE_EN,
};
/*
@ -119,7 +138,7 @@ static int sc27xx_efuse_read(void *context, u32 offset, void *val, size_t bytes)
return ret;
/* Enable the efuse controller. */
ret = regmap_update_bits(efuse->regmap, SC27XX_MODULE_EN,
ret = regmap_update_bits(efuse->regmap, efuse->var_data->module_en,
SC27XX_EFUSE_EN, SC27XX_EFUSE_EN);
if (ret)
goto unlock_efuse;
@ -169,7 +188,7 @@ static int sc27xx_efuse_read(void *context, u32 offset, void *val, size_t bytes)
disable_efuse:
/* Disable the efuse controller after reading. */
regmap_update_bits(efuse->regmap, SC27XX_MODULE_EN, SC27XX_EFUSE_EN, 0);
regmap_update_bits(efuse->regmap, efuse->var_data->module_en, SC27XX_EFUSE_EN, 0);
unlock_efuse:
sc27xx_efuse_unlock(efuse);
@ -219,6 +238,7 @@ static int sc27xx_efuse_probe(struct platform_device *pdev)
mutex_init(&efuse->mutex);
efuse->dev = &pdev->dev;
efuse->var_data = of_device_get_match_data(&pdev->dev);
econfig.stride = 1;
econfig.word_size = 1;
@ -238,7 +258,8 @@ static int sc27xx_efuse_probe(struct platform_device *pdev)
}
static const struct of_device_id sc27xx_efuse_of_match[] = {
{ .compatible = "sprd,sc2731-efuse" },
{ .compatible = "sprd,sc2731-efuse", .data = &sc2731_edata},
{ .compatible = "sprd,sc2730-efuse", .data = &sc2730_edata},
{ }
};