140 lines
2.8 KiB
C
140 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* (C) Copyright 2016 Beniamino Galvani <b.galvani@gmail.com>
|
|
*
|
|
* Secure monitor calls.
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <log.h>
|
|
#include <asm/arch/sm.h>
|
|
#include <asm/cache.h>
|
|
#include <asm/global_data.h>
|
|
#include <asm/ptrace.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/err.h>
|
|
#include <linux/kernel.h>
|
|
#include <dm.h>
|
|
#include <linux/bitfield.h>
|
|
#include <regmap.h>
|
|
#include <syscon.h>
|
|
|
|
#define FN_GET_SHARE_MEM_INPUT_BASE 0x82000020
|
|
#define FN_GET_SHARE_MEM_OUTPUT_BASE 0x82000021
|
|
#define FN_EFUSE_READ 0x82000030
|
|
#define FN_EFUSE_WRITE 0x82000031
|
|
#define FN_CHIP_ID 0x82000044
|
|
|
|
static void *shmem_input;
|
|
static void *shmem_output;
|
|
|
|
static void meson_init_shmem(void)
|
|
{
|
|
struct pt_regs regs;
|
|
|
|
if (shmem_input && shmem_output)
|
|
return;
|
|
|
|
regs.regs[0] = FN_GET_SHARE_MEM_INPUT_BASE;
|
|
smc_call(®s);
|
|
shmem_input = (void *)regs.regs[0];
|
|
|
|
regs.regs[0] = FN_GET_SHARE_MEM_OUTPUT_BASE;
|
|
smc_call(®s);
|
|
shmem_output = (void *)regs.regs[0];
|
|
|
|
debug("Secure Monitor shmem: 0x%p 0x%p\n", shmem_input, shmem_output);
|
|
}
|
|
|
|
ssize_t meson_sm_read_efuse(uintptr_t offset, void *buffer, size_t size)
|
|
{
|
|
struct pt_regs regs;
|
|
|
|
meson_init_shmem();
|
|
|
|
regs.regs[0] = FN_EFUSE_READ;
|
|
regs.regs[1] = offset;
|
|
regs.regs[2] = size;
|
|
|
|
smc_call(®s);
|
|
|
|
if (regs.regs[0] == 0)
|
|
return -1;
|
|
|
|
memcpy(buffer, shmem_output, min(size, regs.regs[0]));
|
|
|
|
return regs.regs[0];
|
|
}
|
|
|
|
ssize_t meson_sm_write_efuse(uintptr_t offset, void *buffer, size_t size)
|
|
{
|
|
struct pt_regs regs;
|
|
|
|
meson_init_shmem();
|
|
|
|
memcpy(shmem_input, buffer, size);
|
|
|
|
regs.regs[0] = FN_EFUSE_WRITE;
|
|
regs.regs[1] = offset;
|
|
regs.regs[2] = size;
|
|
|
|
smc_call(®s);
|
|
|
|
return regs.regs[0];
|
|
}
|
|
|
|
#define SM_CHIP_ID_LENGTH 119
|
|
#define SM_CHIP_ID_OFFSET 4
|
|
#define SM_CHIP_ID_SIZE 12
|
|
|
|
int meson_sm_get_serial(void *buffer, size_t size)
|
|
{
|
|
struct pt_regs regs;
|
|
|
|
meson_init_shmem();
|
|
|
|
regs.regs[0] = FN_CHIP_ID;
|
|
regs.regs[1] = 0;
|
|
regs.regs[2] = 0;
|
|
|
|
smc_call(®s);
|
|
|
|
memcpy(buffer, shmem_output + SM_CHIP_ID_OFFSET,
|
|
min_t(size_t, size, SM_CHIP_ID_SIZE));
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define AO_SEC_SD_CFG15 0xfc
|
|
#define REBOOT_REASON_MASK GENMASK(15, 12)
|
|
|
|
int meson_sm_get_reboot_reason(void)
|
|
{
|
|
struct regmap *regmap;
|
|
int nodeoffset;
|
|
ofnode node;
|
|
unsigned int reason;
|
|
|
|
/* find the offset of compatible node */
|
|
nodeoffset = fdt_node_offset_by_compatible(gd->fdt_blob, -1,
|
|
"amlogic,meson-gx-ao-secure");
|
|
if (nodeoffset < 0) {
|
|
printf("%s: failed to get amlogic,meson-gx-ao-secure\n",
|
|
__func__);
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* get regmap from the syscon node */
|
|
node = offset_to_ofnode(nodeoffset);
|
|
regmap = syscon_node_to_regmap(node);
|
|
if (IS_ERR(regmap)) {
|
|
printf("%s: failed to get regmap\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
regmap_read(regmap, AO_SEC_SD_CFG15, &reason);
|
|
|
|
/* The SMC call is not used, we directly use AO_SEC_SD_CFG15 */
|
|
return FIELD_GET(REBOOT_REASON_MASK, reason);
|
|
}
|