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

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

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
This commit is contained in:
Neil Armstrong 2019-06-12 11:49:06 +02:00
parent aca71d6927
commit 0ef8e4069e
2 changed files with 25 additions and 0 deletions
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1
arch/arm/include/asm/arch-meson/sm.h
View File

@ -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__ */

24
arch/arm/mach-meson/sm.c
View File

@ -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;
}