diff options
Diffstat (limited to 'arch/powerpc/include/asm/scom.h')
| -rw-r--r-- | arch/powerpc/include/asm/scom.h | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/arch/powerpc/include/asm/scom.h b/arch/powerpc/include/asm/scom.h index 0cabfd7bc2d1..f5cde45b1161 100644 --- a/arch/powerpc/include/asm/scom.h +++ b/arch/powerpc/include/asm/scom.h @@ -54,8 +54,8 @@ struct scom_controller { scom_map_t (*map)(struct device_node *ctrl_dev, u64 reg, u64 count); void (*unmap)(scom_map_t map); - u64 (*read)(scom_map_t map, u32 reg); - void (*write)(scom_map_t map, u32 reg, u64 value); + int (*read)(scom_map_t map, u64 reg, u64 *value); + int (*write)(scom_map_t map, u64 reg, u64 value); }; extern const struct scom_controller *scom_controller; @@ -133,10 +133,18 @@ static inline void scom_unmap(scom_map_t map) * scom_read - Read a SCOM register * @map: Result of scom_map * @reg: Register index within that map + * @value: Updated with the value read + * + * Returns 0 (success) or a negative error code */ -static inline u64 scom_read(scom_map_t map, u32 reg) +static inline int scom_read(scom_map_t map, u64 reg, u64 *value) { - return scom_controller->read(map, reg); + int rc; + + rc = scom_controller->read(map, reg, value); + if (rc) + *value = 0xfffffffffffffffful; + return rc; } /** @@ -144,12 +152,15 @@ static inline u64 scom_read(scom_map_t map, u32 reg) * @map: Result of scom_map * @reg: Register index within that map * @value: Value to write + * + * Returns 0 (success) or a negative error code */ -static inline void scom_write(scom_map_t map, u32 reg, u64 value) +static inline int scom_write(scom_map_t map, u64 reg, u64 value) { - scom_controller->write(map, reg, value); + return scom_controller->write(map, reg, value); } + #endif /* CONFIG_PPC_SCOM */ #endif /* __ASSEMBLY__ */ #endif /* __KERNEL__ */ |