1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2016 Beniamino Galvani <b.galvani@gmail.com>
5 * Secure monitor calls.
9 #include <linux/kernel.h>
11 #define FN_GET_SHARE_MEM_INPUT_BASE 0x82000020
12 #define FN_GET_SHARE_MEM_OUTPUT_BASE 0x82000021
13 #define FN_EFUSE_READ 0x82000030
14 #define FN_EFUSE_WRITE 0x82000031
16 static void *shmem_input;
17 static void *shmem_output;
19 static void meson_init_shmem(void)
23 if (shmem_input && shmem_output)
26 regs.regs[0] = FN_GET_SHARE_MEM_INPUT_BASE;
28 shmem_input = (void *)regs.regs[0];
30 regs.regs[0] = FN_GET_SHARE_MEM_OUTPUT_BASE;
32 shmem_output = (void *)regs.regs[0];
34 debug("Secure Monitor shmem: 0x%p 0x%p\n", shmem_input, shmem_output);
37 ssize_t meson_sm_read_efuse(uintptr_t offset, void *buffer, size_t size)
43 regs.regs[0] = FN_EFUSE_READ;
44 regs.regs[1] = offset;
49 if (regs.regs[0] == 0)
52 memcpy(buffer, shmem_output, min(size, regs.regs[0]));