2019-08-21 03:47:29

by Peng Fan

Subject: [PATCH 1/2] nvmem: imx: scu: support hole region check

From: Peng Fan <[email protected]>

Introduce HOLE/ECC_REGION flag and in_hole helper to ease the check
of hole region. The ECC_REGION is also introduced here which is
preparing for programming support. ECC_REGION could only be programmed
once, so need take care.

Signed-off-by: Peng Fan <[email protected]>
---
drivers/nvmem/imx-ocotp-scu.c | 42 +++++++++++++++++++++++++++++++++++++-----
1 file changed, 37 insertions(+), 5 deletions(-)

diff --git a/drivers/nvmem/imx-ocotp-scu.c b/drivers/nvmem/imx-ocotp-scu.c
index d9dc482ecb2f..2f339d7432e6 100644
--- a/drivers/nvmem/imx-ocotp-scu.c
+++ b/drivers/nvmem/imx-ocotp-scu.c
@@ -18,9 +18,20 @@ enum ocotp_devtype {
IMX8QXP,
};

+#define ECC_REGION BIT(0)
+#define HOLE_REGION BIT(1)
+
+struct ocotp_region {
+ u32 start;
+ u32 end;
+ u32 flag;
+};
+
struct ocotp_devtype_data {
int devtype;
int nregs;
+ u32 num_region;
+ struct ocotp_region region[];
};

struct ocotp_priv {
@@ -37,8 +48,31 @@ struct imx_sc_msg_misc_fuse_read {
static struct ocotp_devtype_data imx8qxp_data = {
.devtype = IMX8QXP,
.nregs = 800,
+ .num_region = 3,
+ .region = {
+ {0x10, 0x10f, ECC_REGION},
+ {0x110, 0x21F, HOLE_REGION},
+ {0x220, 0x31F, ECC_REGION},
+ },
};

+static bool in_hole(void *context, u32 index)
+{
+ struct ocotp_priv *priv = context;
+ const struct ocotp_devtype_data *data = priv->data;
+ int i;
+
+ for (i = 0; i < data->num_region; i++) {
+ if (data->region[i].flag & HOLE_REGION) {
+ if ((index >= data->region[i].start) &&
+ (index <= data->region[i].end))
+ return true;
+ }
+ }
+
+ return false;
+}
+
static int imx_sc_misc_otp_fuse_read(struct imx_sc_ipc *ipc, u32 word,
u32 *val)
{
@@ -85,11 +119,9 @@ static int imx_scu_ocotp_read(void *context, unsigned int offset,
buf = p;

for (i = index; i < (index + count); i++) {
- if (priv->data->devtype == IMX8QXP) {
- if ((i > 271) && (i < 544)) {
- *buf++ = 0;
- continue;
- }
+ if (in_hole(context, i)) {
+ *buf++ = 0;
+ continue;
}

ret = imx_sc_misc_otp_fuse_read(priv->nvmem_ipc, i, buf);
--
2.16.4

2019-09-06 13:45:26

by Peng Fan

Subject: RE: [PATCH 1/2] nvmem: imx: scu: support hole region check

> Subject: [PATCH 1/2] nvmem: imx: scu: support hole region check

Ping..

Thanks,
Peng.

>
> From: Peng Fan <[email protected]>
>
> Introduce HOLE/ECC_REGION flag and in_hole helper to ease the check of
> hole region. The ECC_REGION is also introduced here which is preparing for
> programming support. ECC_REGION could only be programmed once, so need
> take care.
>
> Signed-off-by: Peng Fan <[email protected]>
> ---
> drivers/nvmem/imx-ocotp-scu.c | 42
> +++++++++++++++++++++++++++++++++++++-----
> 1 file changed, 37 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/nvmem/imx-ocotp-scu.c b/drivers/nvmem/imx-ocotp-scu.c
> index d9dc482ecb2f..2f339d7432e6 100644
> --- a/drivers/nvmem/imx-ocotp-scu.c
> +++ b/drivers/nvmem/imx-ocotp-scu.c
> @@ -18,9 +18,20 @@ enum ocotp_devtype {
> IMX8QXP,
> };
>
> +#define ECC_REGION BIT(0)
> +#define HOLE_REGION BIT(1)
> +
> +struct ocotp_region {
> + u32 start;
> + u32 end;
> + u32 flag;
> +};
> +
> struct ocotp_devtype_data {
> int devtype;
> int nregs;
> + u32 num_region;
> + struct ocotp_region region[];
> };
>
> struct ocotp_priv {
> @@ -37,8 +48,31 @@ struct imx_sc_msg_misc_fuse_read { static struct
> ocotp_devtype_data imx8qxp_data = {
> .devtype = IMX8QXP,
> .nregs = 800,
> + .num_region = 3,
> + .region = {
> + {0x10, 0x10f, ECC_REGION},
> + {0x110, 0x21F, HOLE_REGION},
> + {0x220, 0x31F, ECC_REGION},
> + },
> };
>
> +static bool in_hole(void *context, u32 index) {
> + struct ocotp_priv *priv = context;
> + const struct ocotp_devtype_data *data = priv->data;
> + int i;
> +
> + for (i = 0; i < data->num_region; i++) {
> + if (data->region[i].flag & HOLE_REGION) {
> + if ((index >= data->region[i].start) &&
> + (index <= data->region[i].end))
> + return true;
> + }
> + }
> +
> + return false;
> +}
> +
> static int imx_sc_misc_otp_fuse_read(struct imx_sc_ipc *ipc, u32 word,
> u32 *val)
> {
> @@ -85,11 +119,9 @@ static int imx_scu_ocotp_read(void *context,
> unsigned int offset,
> buf = p;
>
> for (i = index; i < (index + count); i++) {
> - if (priv->data->devtype == IMX8QXP) {
> - if ((i > 271) && (i < 544)) {
> - *buf++ = 0;
> - continue;
> - }
> + if (in_hole(context, i)) {
> + *buf++ = 0;
> + continue;
> }
>
> ret = imx_sc_misc_otp_fuse_read(priv->nvmem_ipc, i, buf);
> --
> 2.16.4