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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 <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
#define FN_PWRDM_SET 0x82000093
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);
}
int meson_sm_pwrdm_set(size_t index, int cmd)
{
struct pt_regs regs;
regs.regs[0] = FN_PWRDM_SET;
regs.regs[1] = index;
regs.regs[2] = cmd;
smc_call(®s);
return regs.regs[0];
}
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