LXR uboot/arch/arm/mach-meson/sm.c

   1/*
   2 * (C) Copyright 2016 Beniamino Galvani <b.galvani@gmail.com>
   3 *
   4 * SPDX-License-Identifier:     GPL-2.0+
   5 *
   6 * Secure monitor calls.
   7 */
   8
   9#include <common.h>
  10#include <asm/arch/gxbb.h>
  11#include <linux/kernel.h>
  12
  13#define FN_GET_SHARE_MEM_INPUT_BASE     0x82000020
  14#define FN_GET_SHARE_MEM_OUTPUT_BASE    0x82000021
  15#define FN_EFUSE_READ                   0x82000030
  16#define FN_EFUSE_WRITE                  0x82000031
  17
  18static void *shmem_input;
  19static void *shmem_output;
  20
  21static void meson_init_shmem(void)
  22{
  23        struct pt_regs regs;
  24
  25        if (shmem_input && shmem_output)
  26                return;
  27
  28        regs.regs[0] = FN_GET_SHARE_MEM_INPUT_BASE;
  29        smc_call(&regs);
  30        shmem_input = (void *)regs.regs[0];
  31
  32        regs.regs[0] = FN_GET_SHARE_MEM_OUTPUT_BASE;
  33        smc_call(&regs);
  34        shmem_output = (void *)regs.regs[0];
  35
  36        debug("Secure Monitor shmem: 0x%p 0x%p\n", shmem_input, shmem_output);
  37}
  38
  39ssize_t meson_sm_read_efuse(uintptr_t offset, void *buffer, size_t size)
  40{
  41        struct pt_regs regs;
  42
  43        meson_init_shmem();
  44
  45        regs.regs[0] = FN_EFUSE_READ;
  46        regs.regs[1] = offset;
  47        regs.regs[2] = size;
  48
  49        smc_call(&regs);
  50
  51        if (regs.regs[0] == 0)
  52                return -1;
  53
  54        memcpy(buffer, shmem_output, min(size, regs.regs[0]));
  55
  56        return regs.regs[0];
  57}
  58