ARM: meson: sm: Add secure monitor calls to retrieve SoC serial number

The Secure Monitor interface permits retrieving the SoC Serial Number,
add a function to retrieve it.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>

diff --git a/arch/arm/include/asm/arch-meson/sm.h b/arch/arm/include/asm/arch-meson/sm.h
index 83d6441803a3f4ed8afdee0a78b388c597f0e53f..a5bac5abda0fb2fc9bdb7209f6d87d5401d86fd4 100644 (file)
--- 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 a07b46895d8b56c24ffece54543de853b3a095ca..05b7f0bdf2cb0ab7ce1d3159710fb38d8a513f1f 100644 (file)
--- 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(&regs);
+
+       memcpy(buffer, shmem_output + SM_CHIP_ID_OFFSET,
+              min_t(size_t, size, SM_CHIP_ID_SIZE));
+
+       return 0;
+}