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nvmem: imx: ocotp: introduce ocotp_ctrl_reg 

Introduce ocotp_ctrl_reg to include the low 16bits mask of CTRL
register.

i.MX chips will have different layout of the low 16bits of CTRL
register, so use ocotp_ctrl_reg will make it clean to add new
chip support.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200109104017.6249-4-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peng Fan 2020-01-09 10:40:16 +00:00 committed by Greg Kroah-Hartman
parent 8c4d35aff5
commit 226c512699
1 changed files with 57 additions and 22 deletions
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79
drivers/nvmem/imx-ocotp.c
View File

@ -44,6 +44,14 @@
#define IMX_OCOTP_BM_CTRL_ERROR 0x00000200
#define IMX_OCOTP_BM_CTRL_REL_SHADOWS 0x00000400
#define IMX_OCOTP_BM_CTRL_DEFAULT \
{ \
.bm_addr = IMX_OCOTP_BM_CTRL_ADDR, \
.bm_busy = IMX_OCOTP_BM_CTRL_BUSY, \
.bm_error = IMX_OCOTP_BM_CTRL_ERROR, \
.bm_rel_shadows = IMX_OCOTP_BM_CTRL_REL_SHADOWS,\
}
#define TIMING_STROBE_PROG_US 10 /* Min time to blow a fuse */
#define TIMING_STROBE_READ_NS 37 /* Min time before read */
#define TIMING_RELAX_NS 17
@ -62,18 +70,31 @@ struct ocotp_priv {
struct nvmem_config *config;
};
struct ocotp_ctrl_reg {
u32 bm_addr;
u32 bm_busy;
u32 bm_error;
u32 bm_rel_shadows;
};
struct ocotp_params {
unsigned int nregs;
unsigned int bank_address_words;
void (*set_timing)(struct ocotp_priv *priv);
struct ocotp_ctrl_reg ctrl;
};
static int imx_ocotp_wait_for_busy(void __iomem *base, u32 flags)
static int imx_ocotp_wait_for_busy(struct ocotp_priv *priv, u32 flags)
{
int count;
u32 c, mask;
u32 bm_ctrl_busy, bm_ctrl_error;
void __iomem *base = priv->base;
mask = IMX_OCOTP_BM_CTRL_BUSY | IMX_OCOTP_BM_CTRL_ERROR | flags;
bm_ctrl_busy = priv->params->ctrl.bm_busy;
bm_ctrl_error = priv->params->ctrl.bm_error;
mask = bm_ctrl_busy | bm_ctrl_error | flags;
for (count = 10000; count >= 0; count--) {
c = readl(base + IMX_OCOTP_ADDR_CTRL);
@ -97,7 +118,7 @@ static int imx_ocotp_wait_for_busy(void __iomem *base, u32 flags)
* - A read is performed to from a fuse word which has been read
* locked.
*/
if (c & IMX_OCOTP_BM_CTRL_ERROR)
if (c & bm_ctrl_error)
return -EPERM;
return -ETIMEDOUT;
}
@ -105,15 +126,18 @@ static int imx_ocotp_wait_for_busy(void __iomem *base, u32 flags)
return 0;
}
static void imx_ocotp_clr_err_if_set(void __iomem *base)
static void imx_ocotp_clr_err_if_set(struct ocotp_priv *priv)
{
u32 c;
u32 c, bm_ctrl_error;
void __iomem *base = priv->base;
bm_ctrl_error = priv->params->ctrl.bm_error;
c = readl(base + IMX_OCOTP_ADDR_CTRL);
if (!(c & IMX_OCOTP_BM_CTRL_ERROR))
if (!(c & bm_ctrl_error))
return;
writel(IMX_OCOTP_BM_CTRL_ERROR, base + IMX_OCOTP_ADDR_CTRL_CLR);
writel(bm_ctrl_error, base + IMX_OCOTP_ADDR_CTRL_CLR);
}
static int imx_ocotp_read(void *context, unsigned int offset,
@ -140,7 +164,7 @@ static int imx_ocotp_read(void *context, unsigned int offset,
return ret;
}
ret = imx_ocotp_wait_for_busy(priv->base, 0);
ret = imx_ocotp_wait_for_busy(priv, 0);
if (ret < 0) {
dev_err(priv->dev, "timeout during read setup\n");
goto read_end;
@ -157,7 +181,7 @@ static int imx_ocotp_read(void *context, unsigned int offset,
* issued
*/
if (*(buf - 1) == IMX_OCOTP_READ_LOCKED_VAL)
imx_ocotp_clr_err_if_set(priv->base);
imx_ocotp_clr_err_if_set(priv);
}
ret = 0;
@ -274,7 +298,7 @@ static int imx_ocotp_write(void *context, unsigned int offset, void *val,
* write or reload must be completed before a write access can be
* requested.
*/
ret = imx_ocotp_wait_for_busy(priv->base, 0);
ret = imx_ocotp_wait_for_busy(priv, 0);
if (ret < 0) {
dev_err(priv->dev, "timeout during timing setup\n");
goto write_end;
@ -306,8 +330,8 @@ static int imx_ocotp_write(void *context, unsigned int offset, void *val,
}
ctrl = readl(priv->base + IMX_OCOTP_ADDR_CTRL);
ctrl &= ~IMX_OCOTP_BM_CTRL_ADDR;
ctrl |= waddr & IMX_OCOTP_BM_CTRL_ADDR;
ctrl &= ~priv->params->ctrl.bm_addr;
ctrl |= waddr & priv->params->ctrl.bm_addr;
ctrl |= IMX_OCOTP_WR_UNLOCK;
writel(ctrl, priv->base + IMX_OCOTP_ADDR_CTRL);
@ -374,11 +398,11 @@ static int imx_ocotp_write(void *context, unsigned int offset, void *val,
* be set. It must be cleared by software before any new write access
* can be issued.
*/
ret = imx_ocotp_wait_for_busy(priv->base, 0);
ret = imx_ocotp_wait_for_busy(priv, 0);
if (ret < 0) {
if (ret == -EPERM) {
dev_err(priv->dev, "failed write to locked region");
imx_ocotp_clr_err_if_set(priv->base);
imx_ocotp_clr_err_if_set(priv);
} else {
dev_err(priv->dev, "timeout during data write\n");
}
@ -394,10 +418,10 @@ static int imx_ocotp_write(void *context, unsigned int offset, void *val,
udelay(2);
/* reload all shadow registers */
writel(IMX_OCOTP_BM_CTRL_REL_SHADOWS,
writel(priv->params->ctrl.bm_rel_shadows,
priv->base + IMX_OCOTP_ADDR_CTRL_SET);
ret = imx_ocotp_wait_for_busy(priv->base,
IMX_OCOTP_BM_CTRL_REL_SHADOWS);
ret = imx_ocotp_wait_for_busy(priv,
priv->params->ctrl.bm_rel_shadows);
if (ret < 0) {
dev_err(priv->dev, "timeout during shadow register reload\n");
goto write_end;
@ -424,65 +448,76 @@ static const struct ocotp_params imx6q_params = {
.nregs = 128,
.bank_address_words = 0,
.set_timing = imx_ocotp_set_imx6_timing,
.ctrl = IMX_OCOTP_BM_CTRL_DEFAULT,
};
static const struct ocotp_params imx6sl_params = {
.nregs = 64,
.bank_address_words = 0,
.set_timing = imx_ocotp_set_imx6_timing,
.ctrl = IMX_OCOTP_BM_CTRL_DEFAULT,
};
static const struct ocotp_params imx6sll_params = {
.nregs = 128,
.bank_address_words = 0,
.set_timing = imx_ocotp_set_imx6_timing,
.ctrl = IMX_OCOTP_BM_CTRL_DEFAULT,
};
static const struct ocotp_params imx6sx_params = {
.nregs = 128,
.bank_address_words = 0,
.set_timing = imx_ocotp_set_imx6_timing,
.ctrl = IMX_OCOTP_BM_CTRL_DEFAULT,
};
static const struct ocotp_params imx6ul_params = {
.nregs = 128,
.bank_address_words = 0,
.set_timing = imx_ocotp_set_imx6_timing,
.ctrl = IMX_OCOTP_BM_CTRL_DEFAULT,
};
static const struct ocotp_params imx6ull_params = {
.nregs = 64,
.bank_address_words = 0,
.set_timing = imx_ocotp_set_imx6_timing,
.ctrl = IMX_OCOTP_BM_CTRL_DEFAULT,
};
static const struct ocotp_params imx7d_params = {
.nregs = 64,
.bank_address_words = 4,
.set_timing = imx_ocotp_set_imx7_timing,
.ctrl = IMX_OCOTP_BM_CTRL_DEFAULT,
};
static const struct ocotp_params imx7ulp_params = {
.nregs = 256,
.bank_address_words = 0,
.ctrl = IMX_OCOTP_BM_CTRL_DEFAULT,
};
static const struct ocotp_params imx8mq_params = {
.nregs = 256,
.bank_address_words = 0,
.set_timing = imx_ocotp_set_imx6_timing,
.ctrl = IMX_OCOTP_BM_CTRL_DEFAULT,
};
static const struct ocotp_params imx8mm_params = {
.nregs = 256,
.bank_address_words = 0,
.set_timing = imx_ocotp_set_imx6_timing,
.ctrl = IMX_OCOTP_BM_CTRL_DEFAULT,
};
static const struct ocotp_params imx8mn_params = {
.nregs = 256,
.bank_address_words = 0,
.set_timing = imx_ocotp_set_imx6_timing,
.ctrl = IMX_OCOTP_BM_CTRL_DEFAULT,
};
static const struct of_device_id imx_ocotp_dt_ids[] = {
@ -521,17 +556,17 @@ static int imx_ocotp_probe(struct platform_device *pdev)
if (IS_ERR(priv->clk))
return PTR_ERR(priv->clk);
clk_prepare_enable(priv->clk);
imx_ocotp_clr_err_if_set(priv->base);
clk_disable_unprepare(priv->clk);
priv->params = of_device_get_match_data(&pdev->dev);
imx_ocotp_nvmem_config.size = 4 * priv->params->nregs;
imx_ocotp_nvmem_config.dev = dev;
imx_ocotp_nvmem_config.priv = priv;
priv->config = &imx_ocotp_nvmem_config;
nvmem = devm_nvmem_register(dev, &imx_ocotp_nvmem_config);
clk_prepare_enable(priv->clk);
imx_ocotp_clr_err_if_set(priv);
clk_disable_unprepare(priv->clk);
nvmem = devm_nvmem_register(dev, &imx_ocotp_nvmem_config);
return PTR_ERR_OR_ZERO(nvmem);
}