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author | Inochi Amaoto <inochiama@outlook.com> | 2024-04-28 09:24:10 +0800 |
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committer | Anup Patel <anup@brainfault.org> | 2024-05-15 11:47:15 +0530 |
commit | ea9cf6aa28ca308f6a2561da5b570ed9f6148978 (patch) | |
tree | e6f2829c7a66a52b4cf7d714feb7b164dc0d3a8f /lib/utils/reset/fdt_reset_sg2042_hwmon_mcu.c | |
parent | 1cb792d606d99fb9574160da1815d6b8b4e366ac (diff) | |
download | opensbi-ea9cf6aa28ca308f6a2561da5b570ed9f6148978.zip opensbi-ea9cf6aa28ca308f6a2561da5b570ed9f6148978.tar.gz opensbi-ea9cf6aa28ca308f6a2561da5b570ed9f6148978.tar.bz2 |
utils/reset: Add SG2042 hwmon MCU support.
SG2042 uses an onboard MCU to provide reset function.
Add reset driver to support this onboard MCU.
Signed-off-by: Inochi Amaoto <inochiama@outlook.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Diffstat (limited to 'lib/utils/reset/fdt_reset_sg2042_hwmon_mcu.c')
-rw-r--r-- | lib/utils/reset/fdt_reset_sg2042_hwmon_mcu.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/lib/utils/reset/fdt_reset_sg2042_hwmon_mcu.c b/lib/utils/reset/fdt_reset_sg2042_hwmon_mcu.c new file mode 100644 index 0000000..51bd74a --- /dev/null +++ b/lib/utils/reset/fdt_reset_sg2042_hwmon_mcu.c @@ -0,0 +1,114 @@ +/* + * 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, +}; |