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Subject[PATCH 1/2] nvmem: imx: scu: support hole region check
Date
From: Peng Fan <peng.fan@nxp.com>

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 <peng.fan@nxp.com>
---
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
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