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0ef8e4069e
The Secure Monitor interface permits retrieving the SoC Serial Number, add a function to retrieve it. Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
80 lines
1.5 KiB
C
80 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2016 Beniamino Galvani <b.galvani@gmail.com>
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*
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* Secure monitor calls.
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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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static void meson_init_shmem(void)
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{
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struct pt_regs regs;
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if (shmem_input && shmem_output)
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return;
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regs.regs[0] = FN_GET_SHARE_MEM_INPUT_BASE;
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smc_call(®s);
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shmem_input = (void *)regs.regs[0];
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regs.regs[0] = FN_GET_SHARE_MEM_OUTPUT_BASE;
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smc_call(®s);
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shmem_output = (void *)regs.regs[0];
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debug("Secure Monitor shmem: 0x%p 0x%p\n", shmem_input, shmem_output);
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}
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ssize_t meson_sm_read_efuse(uintptr_t offset, 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_EFUSE_READ;
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regs.regs[1] = offset;
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regs.regs[2] = size;
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smc_call(®s);
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if (regs.regs[0] == 0)
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return -1;
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memcpy(buffer, shmem_output, min(size, regs.regs[0]));
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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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