The Secure Monitor interface permits retrieving the SoC Serial Number, add a function to retrieve it.
Signed-off-by: Neil Armstrong narmstrong@baylibre.com --- arch/arm/include/asm/arch-meson/sm.h | 1 + arch/arm/mach-meson/sm.c | 24 ++++++++++++++++++++++++ 2 files changed, 25 insertions(+)
diff --git a/arch/arm/include/asm/arch-meson/sm.h b/arch/arm/include/asm/arch-meson/sm.h index 83d6441803..a5bac5abda 100644 --- a/arch/arm/include/asm/arch-meson/sm.h +++ b/arch/arm/include/asm/arch-meson/sm.h @@ -7,5 +7,6 @@ #define __MESON_SM_H__
ssize_t meson_sm_read_efuse(uintptr_t offset, void *buffer, size_t size); +int meson_sm_get_serial(void *buffer, size_t size);
#endif /* __MESON_SM_H__ */ diff --git a/arch/arm/mach-meson/sm.c b/arch/arm/mach-meson/sm.c index a07b46895d..05b7f0bdf2 100644 --- a/arch/arm/mach-meson/sm.c +++ b/arch/arm/mach-meson/sm.c @@ -6,12 +6,14 @@ */
#include <common.h> +#include <asm/arch/sm.h> #include <linux/kernel.h>
#define FN_GET_SHARE_MEM_INPUT_BASE 0x82000020 #define FN_GET_SHARE_MEM_OUTPUT_BASE 0x82000021 #define FN_EFUSE_READ 0x82000030 #define FN_EFUSE_WRITE 0x82000031 +#define FN_CHIP_ID 0x82000044
static void *shmem_input; static void *shmem_output; @@ -53,3 +55,25 @@ ssize_t meson_sm_read_efuse(uintptr_t offset, void *buffer, size_t size)
return regs.regs[0]; } + +#define SM_CHIP_ID_LENGTH 119 +#define SM_CHIP_ID_OFFSET 4 +#define SM_CHIP_ID_SIZE 12 + +int meson_sm_get_serial(void *buffer, size_t size) +{ + struct pt_regs regs; + + meson_init_shmem(); + + regs.regs[0] = FN_CHIP_ID; + regs.regs[1] = 0; + regs.regs[2] = 0; + + smc_call(®s); + + memcpy(buffer, shmem_output + SM_CHIP_ID_OFFSET, + min_t(size_t, size, SM_CHIP_ID_SIZE)); + + return 0; +}