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authorNeil Armstrong <narmstrong@baylibre.com>2019-06-12 11:49:06 +0200
committerNeil Armstrong <narmstrong@baylibre.com>2019-07-04 16:04:59 +0200
commit0ef8e4069e410f872558c26af2486041cb797663 (patch)
tree34337455504263606dcbee5b41030281f54fda56
parentaca71d69273593a361710a6b0e933d91b261ea77 (diff)
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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>
-rw-r--r--arch/arm/include/asm/arch-meson/sm.h1
-rw-r--r--arch/arm/mach-meson/sm.c24
2 files changed, 25 insertions, 0 deletions
diff --git a/arch/arm/include/asm/arch-meson/sm.h b/arch/arm/include/asm/arch-meson/sm.h
index 83d6441..a5bac5a 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 a07b468..05b7f0b 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(&regs);
+
+ memcpy(buffer, shmem_output + SM_CHIP_ID_OFFSET,
+ min_t(size_t, size, SM_CHIP_ID_SIZE));
+
+ return 0;
+}