1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2016 Beniamino Galvani <b.galvani@gmail.com>
5 * Secure monitor calls.
9 #include <asm/arch/gx.h>
10 #include <linux/kernel.h>
12 #define FN_GET_SHARE_MEM_INPUT_BASE 0x82000020
13 #define FN_GET_SHARE_MEM_OUTPUT_BASE 0x82000021
14 #define FN_EFUSE_READ 0x82000030
15 #define FN_EFUSE_WRITE 0x82000031
17 static void *shmem_input;
18 static void *shmem_output;
20 static void meson_init_shmem(void)
24 if (shmem_input && shmem_output)
27 regs.regs[0] = FN_GET_SHARE_MEM_INPUT_BASE;
29 shmem_input = (void *)regs.regs[0];
31 regs.regs[0] = FN_GET_SHARE_MEM_OUTPUT_BASE;
33 shmem_output = (void *)regs.regs[0];
35 debug("Secure Monitor shmem: 0x%p 0x%p\n", shmem_input, shmem_output);
38 ssize_t meson_sm_read_efuse(uintptr_t offset, void *buffer, size_t size)
44 regs.regs[0] = FN_EFUSE_READ;
45 regs.regs[1] = offset;
50 if (regs.regs[0] == 0)
53 memcpy(buffer, shmem_output, min(size, regs.regs[0]));