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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2016 Beniamino Galvani <b.galvani@gmail.com>
*
* Secure monitor calls.
*/
#include <common.h>
#include <asm/arch/sm.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];
}
#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);
}
static int do_sm_serial(cmd_tbl_t *cmdtp, int flag, int argc,
char *const argv[])
{
ulong address;
int ret;
if (argc < 2)
return CMD_RET_USAGE;
address = simple_strtoul(argv[1], NULL, 0);
ret = meson_sm_get_serial((void *)address, SM_CHIP_ID_SIZE);
if (ret)
return CMD_RET_FAILURE;
return CMD_RET_SUCCESS;
}
#define MAX_REBOOT_REASONS 14
static const char *reboot_reasons[MAX_REBOOT_REASONS] = {
[REBOOT_REASON_COLD] = "cold_boot",
[REBOOT_REASON_NORMAL] = "normal",
[REBOOT_REASON_RECOVERY] = "recovery",
[REBOOT_REASON_UPDATE] = "update",
[REBOOT_REASON_FASTBOOT] = "fastboot",
[REBOOT_REASON_SUSPEND_OFF] = "suspend_off",
[REBOOT_REASON_HIBERNATE] = "hibernate",
[REBOOT_REASON_BOOTLOADER] = "bootloader",
[REBOOT_REASON_SHUTDOWN_REBOOT] = "shutdown_reboot",
[REBOOT_REASON_RPMBP] = "rpmbp",
[REBOOT_REASON_CRASH_DUMP] = "crash_dump",
[REBOOT_REASON_KERNEL_PANIC] = "kernel_panic",
[REBOOT_REASON_WATCHDOG_REBOOT] = "watchdog_reboot",
};
static int do_sm_reboot_reason(cmd_tbl_t *cmdtp, int flag, int argc,
char *const argv[])
{
const char *reason_str;
char *destarg = NULL;
int reason;
if (argc > 1)
destarg = argv[1];
reason = meson_sm_get_reboot_reason();
if (reason < 0)
return CMD_RET_FAILURE;
if (reason >= MAX_REBOOT_REASONS ||
!reboot_reasons[reason])
reason_str = "unknown";
else
reason_str = reboot_reasons[reason];
if (destarg)
env_set(destarg, reason_str);
else
printf("reboot reason: %s (%x)\n", reason_str, reason);
return CMD_RET_SUCCESS;
}
static cmd_tbl_t cmd_sm_sub[] = {
U_BOOT_CMD_MKENT(serial, 2, 1, do_sm_serial, "", ""),
U_BOOT_CMD_MKENT(reboot_reason, 1, 1, do_sm_reboot_reason, "", ""),
};
static int do_sm(cmd_tbl_t *cmdtp, int flag, int argc,
char *const argv[])
{
cmd_tbl_t *c;
if (argc < 2)
return CMD_RET_USAGE;
/* Strip off leading 'sm' command argument */
argc--;
argv++;
c = find_cmd_tbl(argv[0], &cmd_sm_sub[0], ARRAY_SIZE(cmd_sm_sub));
if (c)
return c->cmd(cmdtp, flag, argc, argv);
else
return CMD_RET_USAGE;
}
U_BOOT_CMD(
sm, 5, 0, do_sm,
"Secure Monitor Control",
"serial <address> - read chip unique id to memory address\n"
"sm reboot_reason [name] - get reboot reason and store to to environment"
);
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