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nvmem: rockchip-otp: Add mutex for read/write

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Change-Id: I4d8b1b3d8e4ad729d3beeccf2357342e45643676
Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
This commit is contained in:
Sugar Zhang
2020-09-10 10:13:57 +08:00
committed by Tao Huang
parent e34822842c
commit 57116bb96f
1 changed files with 36 additions and 2 deletions
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38
drivers/nvmem/rockchip-otp.c
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@@ -70,6 +70,8 @@
#define RV1126_OTP_NVM_PRSTART 0x44
#define RV1126_OTP_NVM_PRSTATE 0x48
struct rockchip_data;
struct rockchip_otp {
struct device *dev;
void __iomem *base;
@@ -77,6 +79,8 @@ struct rockchip_otp {
int num_clks;
struct reset_control *rst;
struct nvmem_config *config;
const struct rockchip_data *data;
struct mutex mutex;
};
struct rockchip_data {
@@ -303,10 +307,40 @@ static int rv1126_otp_oem_write(void *context, unsigned int offset, void *val,
return rv1126_otp_write(context, offset, val, bytes);
}
static int rockchip_otp_read(void *context, unsigned int offset, void *val,
size_t bytes)
{
struct rockchip_otp *otp = context;
int ret = -EINVAL;
mutex_lock(&otp->mutex);
if (otp->data && otp->data->reg_read)
ret = otp->data->reg_read(context, offset, val, bytes);
mutex_unlock(&otp->mutex);
return ret;
}
static int rockchip_otp_write(void *context, unsigned int offset, void *val,
size_t bytes)
{
struct rockchip_otp *otp = context;
int ret = -EINVAL;
mutex_lock(&otp->mutex);
if (otp->data && otp->data->reg_write)
ret = otp->data->reg_write(context, offset, val, bytes);
mutex_unlock(&otp->mutex);
return ret;
}
static struct nvmem_config otp_config = {
.name = "rockchip-otp",
.owner = THIS_MODULE,
.read_only = true,
.reg_read = rockchip_otp_read,
.reg_write = rockchip_otp_write,
.stride = 1,
.word_size = 1,
};
@@ -371,6 +405,8 @@ static int rockchip_otp_probe(struct platform_device *pdev)
if (!otp)
return -ENOMEM;
mutex_init(&otp->mutex);
otp->data = data;
otp->dev = dev;
otp->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(otp->base))
@@ -395,8 +431,6 @@ static int rockchip_otp_probe(struct platform_device *pdev)
otp->config = &otp_config;
otp->config->size = data->size;
otp->config->reg_read = data->reg_read;
otp->config->reg_write = data->reg_write;
otp->config->priv = otp;
otp->config->dev = dev;