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nvmem: rockchip-otp: Add write protection for oem zone

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This patch reserved 16 bytes at the tail for write protection
and future extension.

+----------+------------------+--------------------------+
| TYPE     | RANGE(byte)      | NOTE                     |
+----------+------------------+--------------------------+
| system   | 0x000 ~ 0x0ff    | system info, read only   |
+----------+------------------+--------------------------+
| oem      | 0x100 ~ 0x1ef    | for customized           |
+----------+------------------+--------------------------+
| reserved | 0x1f0 ~ 0x1f7    | future extension         |
+----------+------------------+--------------------------+
| wp       | 0x1f8 ~ 0x1ff    | write protection for oem |
+----------+------------------+--------------------------+

+-----+    +------------------+
| wp  | -- | wp for oem range |
+-----+    +------------------+
| 1f8 |    | 0x100 ~ 0x11f    |
+-----+    +------------------+
| 1f9 |    | 0x120 ~ 0x13f    |
+-----+    +------------------+
| 1fa |    | 0x140 ~ 0x15f    |
+-----+    +------------------+
| 1fb |    | 0x160 ~ 0x17f    |
+-----+    +------------------+
| 1fc |    | 0x180 ~ 0x19f    |
+-----+    +------------------+
| 1fd |    | 0x1a0 ~ 0x1bf    |
+-----+    +------------------+
| 1fe |    | 0x1c0 ~ 0x1df    |
+-----+    +------------------+
| 1ff |    | 0x1e0 ~ 0x1ef    |
+-----+    +------------------+

Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
Change-Id: If23bb8d77d684a3bff5797e35914c1f897c69fb0
This commit is contained in:
Sugar Zhang 2020-10-05 17:54:43 +08:00 committed by Tao Huang
parent 6ac3f5e46b
commit d731c63d8b
1 changed files with 67 additions and 3 deletions
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70
drivers/nvmem/rockchip-otp.c
View File

@ -70,7 +70,48 @@
#define RV1126_OTP_NVM_PRSTART 0x44
#define RV1126_OTP_NVM_PRSTATE 0x48
#define ROCKCHIP_OTP_WR_MAGIC (0x524F434B)
/*
* +----------+------------------+--------------------------+
* | TYPE | RANGE(byte) | NOTE |
* +----------+------------------+--------------------------+
* | system | 0x000 ~ 0x0ff | system info, read only |
* +----------+------------------+--------------------------+
* | oem | 0x100 ~ 0x1ef | for customized |
* +----------+------------------+--------------------------+
* | reserved | 0x1f0 ~ 0x1f7 | future extension |
* +----------+------------------+--------------------------+
* | wp | 0x1f8 ~ 0x1ff | write protection for oem |
* +----------+------------------+--------------------------+
*
* +-----+ +------------------+
* | wp | -- | wp for oem range |
* +-----+ +------------------+
* | 1f8 | | 0x100 ~ 0x11f |
* +-----+ +------------------+
* | 1f9 | | 0x120 ~ 0x13f |
* +-----+ +------------------+
* | 1fa | | 0x140 ~ 0x15f |
* +-----+ +------------------+
* | 1fb | | 0x160 ~ 0x17f |
* +-----+ +------------------+
* | 1fc | | 0x180 ~ 0x19f |
* +-----+ +------------------+
* | 1fd | | 0x1a0 ~ 0x1bf |
* +-----+ +------------------+
* | 1fe | | 0x1c0 ~ 0x1df |
* +-----+ +------------------+
* | 1ff | | 0x1e0 ~ 0x1ef |
* +-----+ +------------------+
*/
#define RV1126_OTP_OEM_OFFSET 0x100
#define RV1126_OTP_OEM_SIZE 0xf0
#define RV1126_OTP_WP_OFFSET 0x1f8
#define RV1126_OTP_WP_SIZE 0x8
/* magic for enable otp write func */
#define ROCKCHIP_OTP_WR_MAGIC 0x524F434B
/* each bit mask 32 bits in OTP NVM */
#define ROCKCHIP_OTP_WP_MASK_NBITS 64
static unsigned int rockchip_otp_wr_magic;
module_param(rockchip_otp_wr_magic, uint, 0644);
@ -87,6 +128,7 @@ struct rockchip_otp {
struct nvmem_config *config;
const struct rockchip_data *data;
struct mutex mutex;
DECLARE_BITMAP(wp_mask, ROCKCHIP_OTP_WP_MASK_NBITS);
};
struct rockchip_data {
@ -304,13 +346,35 @@ static int rv1126_otp_write(void *context, unsigned int offset, void *val,
return 0;
}
static int rv1126_otp_wp(void *context, unsigned int offset, size_t bytes)
{
struct rockchip_otp *otp = context;
bitmap_set(otp->wp_mask, (offset - RV1126_OTP_OEM_OFFSET) / 4, bytes / 4);
return rv1126_otp_write(context, RV1126_OTP_WP_OFFSET, otp->wp_mask,
RV1126_OTP_WP_SIZE);
}
static int rv1126_otp_oem_write(void *context, unsigned int offset, void *val,
size_t bytes)
{
if (offset < 256 || offset > 511 || bytes > 256 || offset + bytes > 512)
int ret = 0;
if (offset < RV1126_OTP_OEM_OFFSET ||
offset > (RV1126_OTP_OEM_OFFSET + RV1126_OTP_OEM_SIZE - 1) ||
bytes > RV1126_OTP_OEM_SIZE ||
(offset + bytes) > (RV1126_OTP_OEM_OFFSET + RV1126_OTP_OEM_SIZE))
return -EINVAL;
return rv1126_otp_write(context, offset, val, bytes);
if (!IS_ALIGNED(offset, 4) || !IS_ALIGNED(bytes, 4))
return -EINVAL;
ret = rv1126_otp_write(context, offset, val, bytes);
if (!ret)
ret = rv1126_otp_wp(context, offset, bytes);
return ret;
}
static int rockchip_otp_read(void *context, unsigned int offset, void *val,