The bcm47xx code makes a copy of the NVRAM data in ram. Allow access to
this data so property values can be read using nvmem cell api.
[ arinc.unal: Improved patch subject and log ]
Signed-off-by: Willem-Jan de Hoog <wdehoog@xxxxxxxxxxxxxx>
Signed-off-by: Arınç ÜNAL <arinc.unal@xxxxxxxxxx>
---
drivers/firmware/broadcom/bcm47xx_nvram.c | 14 ++++++++++++++
include/linux/bcm47xx_nvram.h | 6 ++++++
2 files changed, 20 insertions(+)
diff --git a/drivers/firmware/broadcom/bcm47xx_nvram.c b/drivers/firmware/broadcom/bcm47xx_nvram.c
index 5f47dbf4889a..7e5c62dc702f 100644
--- a/drivers/firmware/broadcom/bcm47xx_nvram.c
+++ b/drivers/firmware/broadcom/bcm47xx_nvram.c
@@ -182,6 +182,20 @@ static int nvram_init(void)
return -ENXIO;
}
+int bcm47xx_nvram_read(unsigned int offset, char *val, size_t val_len)
+{
+ if (!nvram_len)
+ return -ENXIO;
+
+ if ((offset+val_len) > nvram_len)
+ return -EINVAL;
+
+ while (val_len--)
+ *val++ = nvram_buf[offset++];
+
+ return 0;
+}
+
int bcm47xx_nvram_getenv(const char *name, char *val, size_t val_len)
{
char *var, *value, *end, *eq;
diff --git a/include/linux/bcm47xx_nvram.h b/include/linux/bcm47xx_nvram.h
index 7615f8d7b1ed..b265b8ce6434 100644
--- a/include/linux/bcm47xx_nvram.h
+++ b/include/linux/bcm47xx_nvram.h
@@ -20,6 +20,7 @@ static inline void bcm47xx_nvram_release_contents(char *nvram)
{
vfree(nvram);
};
+int bcm47xx_nvram_read(unsigned int offset, char *val, size_t val_len);
#else
static inline int bcm47xx_nvram_init_from_iomem(void __iomem *nvram_start,
size_t res_size)
@@ -48,6 +49,11 @@ static inline char *bcm47xx_nvram_get_contents(size_t *val_len)
static inline void bcm47xx_nvram_release_contents(char *nvram)
{
};
+
+static inline int bcm47xx_nvram_read(unsigned int offset, char *val, size_t val_len)
+{
+ return -ENOTSUPP;
+}:
#endif
#endif /* __BCM47XX_NVRAM_H */
--
2.37.2
