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authorFreeman Liu <freeman.liu@unisoc.com>2019-01-28 15:54:54 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-01-31 16:24:14 +0100
commit996e39bb03ba0ec31dbe8c1c7df11130ba9de639 (patch)
treea9e3b8bd802539a2b4cc3f5af84f250d7189d94e /drivers/nvmem
parent38cd7ad5bd25a7e63f17fa58bb54d1df8ff3fbf8 (diff)
downloadlinux-996e39bb03ba0ec31dbe8c1c7df11130ba9de639.tar.bz2
nvmem: sc27xx: Convert nvmem offset to block index
The Spreadtrum SC27XX efuse data are organized by blocks and each block contains 2 bytes data. Moreover the nvmem core always pass the offset in byte to the controller, so we should change the offset in byte to the correct block index and block offset to read the data. Signed-off-by: Freeman Liu <freeman.liu@unisoc.com> Signed-off-by: Baolin Wang <baolin.wang@linaro.org> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/nvmem')
-rw-r--r--drivers/nvmem/sc27xx-efuse.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/nvmem/sc27xx-efuse.c b/drivers/nvmem/sc27xx-efuse.c
index 33185d8d82cf..c6ee21018d80 100644
--- a/drivers/nvmem/sc27xx-efuse.c
+++ b/drivers/nvmem/sc27xx-efuse.c
@@ -106,10 +106,12 @@ static int sc27xx_efuse_poll_status(struct sc27xx_efuse *efuse, u32 bits)
static int sc27xx_efuse_read(void *context, u32 offset, void *val, size_t bytes)
{
struct sc27xx_efuse *efuse = context;
- u32 buf;
+ u32 buf, blk_index = offset / SC27XX_EFUSE_BLOCK_WIDTH;
+ u32 blk_offset = (offset % SC27XX_EFUSE_BLOCK_WIDTH) * BITS_PER_BYTE;
int ret;
- if (offset > SC27XX_EFUSE_BLOCK_MAX || bytes > SC27XX_EFUSE_BLOCK_WIDTH)
+ if (blk_index > SC27XX_EFUSE_BLOCK_MAX ||
+ bytes > SC27XX_EFUSE_BLOCK_WIDTH)
return -EINVAL;
ret = sc27xx_efuse_lock(efuse);
@@ -133,7 +135,7 @@ static int sc27xx_efuse_read(void *context, u32 offset, void *val, size_t bytes)
/* Set the block address to be read. */
ret = regmap_write(efuse->regmap,
efuse->base + SC27XX_EFUSE_BLOCK_INDEX,
- offset & SC27XX_EFUSE_BLOCK_MASK);
+ blk_index & SC27XX_EFUSE_BLOCK_MASK);
if (ret)
goto disable_efuse;
@@ -171,8 +173,10 @@ disable_efuse:
unlock_efuse:
sc27xx_efuse_unlock(efuse);
- if (!ret)
+ if (!ret) {
+ buf >>= blk_offset;
memcpy(val, &buf, bytes);
+ }
return ret;
}