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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>
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2 changed files with 25 additions and 0 deletions
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@ -7,5 +7,6 @@
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#define __MESON_SM_H__
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ssize_t meson_sm_read_efuse(uintptr_t offset, void *buffer, size_t size);
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int meson_sm_get_serial(void *buffer, size_t size);
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#endif /* __MESON_SM_H__ */
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@ -6,12 +6,14 @@
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*/
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#include <common.h>
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#include <asm/arch/sm.h>
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#include <linux/kernel.h>
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#define FN_GET_SHARE_MEM_INPUT_BASE 0x82000020
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#define FN_GET_SHARE_MEM_OUTPUT_BASE 0x82000021
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#define FN_EFUSE_READ 0x82000030
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#define FN_EFUSE_WRITE 0x82000031
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#define FN_CHIP_ID 0x82000044
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static void *shmem_input;
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static void *shmem_output;
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@ -53,3 +55,25 @@ ssize_t meson_sm_read_efuse(uintptr_t offset, void *buffer, size_t size)
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return regs.regs[0];
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}
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#define SM_CHIP_ID_LENGTH 119
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#define SM_CHIP_ID_OFFSET 4
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#define SM_CHIP_ID_SIZE 12
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int meson_sm_get_serial(void *buffer, size_t size)
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{
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struct pt_regs regs;
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meson_init_shmem();
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regs.regs[0] = FN_CHIP_ID;
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regs.regs[1] = 0;
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regs.regs[2] = 0;
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smc_call(®s);
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memcpy(buffer, shmem_output + SM_CHIP_ID_OFFSET,
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min_t(size_t, size, SM_CHIP_ID_SIZE));
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return 0;
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}
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