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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2023 Lin Chunzhi <chunzhi.lin@sophgo.com>
*/
#include <libfdt.h>
#include <sbi/sbi_hart.h>
#include <sbi/sbi_types.h>
#include <sbi/sbi_error.h>
#include <sbi/sbi_system.h>
#include <sbi/sbi_console.h>
#include <sbi_utils/fdt/fdt_helper.h>
#include <sbi_utils/reset/fdt_reset.h>
#include <sbi_utils/i2c/fdt_i2c.h>
#define MANGO_BOARD_TYPE_MASK 0x80
#define REG_BOARD_TYPE 0x00
#define REG_CMD 0x03
#define CMD_POWEROFF 0x02
#define CMD_RESET 0x03
#define CMD_REBOOT 0x07
static struct i2c_adapter *mcu_adapter = NULL;
static uint32_t mcu_reg = 0;
static int sg2042_mcu_reset_check(u32 type, u32 reason)
{
switch (type) {
case SBI_SRST_RESET_TYPE_SHUTDOWN:
return 1;
case SBI_SRST_RESET_TYPE_COLD_REBOOT:
case SBI_SRST_RESET_TYPE_WARM_REBOOT:
return 255;
}
return 0;
}
static void sg2042_mcu_reset(u32 type, u32 reason)
{
switch (type) {
case SBI_SRST_RESET_TYPE_SHUTDOWN:
i2c_adapter_reg_write(mcu_adapter, mcu_reg,
REG_CMD, CMD_POWEROFF);
break;
case SBI_SRST_RESET_TYPE_COLD_REBOOT:
case SBI_SRST_RESET_TYPE_WARM_REBOOT:
i2c_adapter_reg_write(mcu_adapter, mcu_reg,
REG_CMD, CMD_REBOOT);
break;
}
}
static struct sbi_system_reset_device sg2042_mcu_reset_device = {
.name = "sg2042-mcu-reset",
.system_reset_check = sg2042_mcu_reset_check,
.system_reset = sg2042_mcu_reset
};
static int sg2042_mcu_reset_check_board(struct i2c_adapter *adap, uint32_t reg)
{
static uint8_t val;
int ret;
/* check board type */
ret = i2c_adapter_reg_read(adap, reg, REG_BOARD_TYPE, &val);
if (ret)
return ret;
if (!(val & MANGO_BOARD_TYPE_MASK))
return SBI_ENODEV;
return 0;
}
static int sg2042_mcu_reset_init(void *fdt, int nodeoff,
const struct fdt_match *match)
{
int ret, i2c_bus;
uint64_t addr;
ret = fdt_get_node_addr_size(fdt, nodeoff, 0, &addr, NULL);
if (ret)
return ret;
mcu_reg = addr;
i2c_bus = fdt_parent_offset(fdt, nodeoff);
if (i2c_bus < 0)
return i2c_bus;
ret = fdt_i2c_adapter_get(fdt, i2c_bus, &mcu_adapter);
if (ret)
return ret;
ret = sg2042_mcu_reset_check_board(mcu_adapter, mcu_reg);
sbi_system_reset_add_device(&sg2042_mcu_reset_device);
return 0;
}
static const struct fdt_match sg2042_mcu_reset_match[] = {
{ .compatible = "sophgo,sg2042-hwmon-mcu", .data = (void *)true},
{ },
};
struct fdt_reset fdt_reset_sg2042_mcu = {
.match_table = sg2042_mcu_reset_match,
.init = sg2042_mcu_reset_init,
};
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