SG2042 use an external MCU to provide basic hardware information and thermal sensors. Add driver support for the onboard MCU of SG2042. Signed-off-by: Inochi Amaoto <inochiama@xxxxxxxxxxx> --- drivers/soc/Kconfig | 1 + drivers/soc/Makefile | 1 + drivers/soc/sophgo/Kconfig | 12 + drivers/soc/sophgo/Makefile | 5 + drivers/soc/sophgo/sg2042-hwmon-mcu.c | 531 ++++++++++++++++++++++++++ 5 files changed, 550 insertions(+) create mode 100644 drivers/soc/sophgo/Kconfig create mode 100644 drivers/soc/sophgo/Makefile create mode 100644 drivers/soc/sophgo/sg2042-hwmon-mcu.c diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig index 5d924e946507..19050f094996 100644 --- a/drivers/soc/Kconfig +++ b/drivers/soc/Kconfig @@ -22,6 +22,7 @@ source "drivers/soc/qcom/Kconfig" source "drivers/soc/renesas/Kconfig" source "drivers/soc/rockchip/Kconfig" source "drivers/soc/samsung/Kconfig" +source "drivers/soc/sophgo/Kconfig" source "drivers/soc/sunxi/Kconfig" source "drivers/soc/tegra/Kconfig" source "drivers/soc/ti/Kconfig" diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile index ba8f5b5460e1..6948e6617316 100644 --- a/drivers/soc/Makefile +++ b/drivers/soc/Makefile @@ -28,6 +28,7 @@ obj-y += qcom/ obj-y += renesas/ obj-y += rockchip/ obj-$(CONFIG_SOC_SAMSUNG) += samsung/ +obj-y += sophgo/ obj-y += sunxi/ obj-$(CONFIG_ARCH_TEGRA) += tegra/ obj-y += ti/ diff --git a/drivers/soc/sophgo/Kconfig b/drivers/soc/sophgo/Kconfig new file mode 100644 index 000000000000..de9842d1c287 --- /dev/null +++ b/drivers/soc/sophgo/Kconfig @@ -0,0 +1,12 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# Sophgo SoC drivers +# + +config SG2042_HWMON_MCU + tristate "SG2042 onboard MCU support" + depends on RISCV + help + Support for SG2042 onboard MCU. This mcu provides power + control and some basic information for SG2042 chip. + If unsure, say Y. diff --git a/drivers/soc/sophgo/Makefile b/drivers/soc/sophgo/Makefile new file mode 100644 index 000000000000..c72729ce61aa --- /dev/null +++ b/drivers/soc/sophgo/Makefile @@ -0,0 +1,5 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# Sophgo SoC drivers +# +obj-$(CONFIG_SG2042_HWMON_MCU) += sg2042-hwmon-mcu.o diff --git a/drivers/soc/sophgo/sg2042-hwmon-mcu.c b/drivers/soc/sophgo/sg2042-hwmon-mcu.c new file mode 100644 index 000000000000..3413b1a0f5e3 --- /dev/null +++ b/drivers/soc/sophgo/sg2042-hwmon-mcu.c @@ -0,0 +1,531 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2024 Inochi Amaoto <inochiama@xxxxxxxxxxx> + * + * Sophgo power control mcu for SG2042 + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/i2c.h> +#include <linux/err.h> +#include <linux/hwmon.h> +#include <linux/time.h> + +/* fixed MCU registers */ +#define REG_BOARD_TYPE 0x00 +#define REG_MCU_FIRMWARE_VERSION 0x01 +#define REG_PCB_VERSION 0x02 +#define REG_PWR_CTRL 0x03 +#define REG_SOC_TEMP 0x04 +#define REG_BOARD_TEMP 0x05 +#define REG_RST_COUNT 0x0a +#define REG_UPTIME 0x0b +#define REG_RESET_REASON 0x0d +#define REG_MCU_TYPE 0x18 +#define REG_CRITICAL_ACTIONS 0x65 +#define REG_CRITICAL_TEMP 0x66 +#define REG_REPOWER_TEMP 0x67 + +#define CRITICAL_ACTION_REBOOT 0x1 +#define CRITICAL_ACTION_POWEROFF 0x2 + +#define DEFAULT_REPOWER_TEMP 60 +#define MAX_REPOWER_TEMP 100 + +#define sg2042_mcu_read_byte(client, reg) \ + i2c_smbus_read_byte_data(client, reg) +#define sg2042_mcu_write_byte(client, reg, value) \ + i2c_smbus_write_byte_data(client, reg, value) +#define sg2042_mcu_read_block(client, reg, array) \ + i2c_smbus_read_i2c_block_data(client, reg, sizeof(array), array) + +#define DEFINE_MCU_ATTR_READ_FUNC(_name, _type, _format) \ + static ssize_t _name##_show(struct device *dev, \ + struct device_attribute *attr, \ + char *buf) \ + { \ + struct sg2042_mcu_data *mcu = dev_get_drvdata(dev); \ + _type ret; \ + ret = sg2042_mcu_get_##_name(mcu->client); \ + if (ret < 0) \ + return ret; \ + return sprintf(buf, _format "\n", ret); \ + } + +struct sg2042_mcu_board_data { + u8 id; + const char *name; +}; + +struct sg2042_mcu_data { + struct i2c_client *client; + const struct sg2042_mcu_board_data *board_info; +}; + +static const struct sg2042_mcu_board_data sg2042_boards_data[] = { + { + .id = 0x80, + .name = "SG2042 evb x8", + }, + { + .id = 0x81, + .name = "SG2042R evb", + }, + { + .id = 0x83, + .name = "SG2042 evb x4", + }, + { + .id = 0x90, + .name = "Milk-V Pioneer", + }, +}; + +static const char *sg2042_mcu_reset_reason[8] = { + "Power supply overheat", + "Power supply failure", + "12V power supply failure", + "Reset commant", + "Unknown", + "Unknown", + "Unknown", + "SoC overheat", +}; + +static int sg2042_mcu_get_board_type(struct i2c_client *client) +{ + return sg2042_mcu_read_byte(client, REG_BOARD_TYPE); +} + +static int sg2042_mcu_get_firmware_version(struct i2c_client *client) +{ + return sg2042_mcu_read_byte(client, REG_MCU_FIRMWARE_VERSION); +} + +static int sg2042_mcu_get_pcb_version(struct i2c_client *client) +{ + return sg2042_mcu_read_byte(client, REG_PCB_VERSION); +} + +static int sg2042_mcu_get_soc_temp(struct i2c_client *client) +{ + return sg2042_mcu_read_byte(client, REG_SOC_TEMP); +} + +static int sg2042_mcu_get_board_temp(struct i2c_client *client) +{ + return sg2042_mcu_read_byte(client, REG_BOARD_TEMP); +} + +static int sg2042_mcu_get_reset_count(struct i2c_client *client) +{ + return sg2042_mcu_read_byte(client, REG_RST_COUNT); +} + +static s32 sg2042_mcu_get_uptime(struct i2c_client *client) +{ + int ret; + u8 time_val[2]; + + ret = sg2042_mcu_read_block(client, REG_UPTIME, time_val); + if (ret < 0) + return ret; + + return (s32)(time_val[0]) + ((s32)(time_val[1]) << 8); +} + +static int sg2042_mcu_get_reset_reason(struct i2c_client *client) +{ + return sg2042_mcu_read_byte(client, REG_RESET_REASON); +} + +static int sg2042_mcu_get_mcu_type(struct i2c_client *client) +{ + return sg2042_mcu_read_byte(client, REG_MCU_TYPE); +} + +static int sg2042_mcu_get_critical_action(struct i2c_client *client) +{ + return sg2042_mcu_read_byte(client, REG_CRITICAL_ACTIONS); +} + +static int sg2042_mcu_get_critical_temp(struct i2c_client *client) +{ + return sg2042_mcu_read_byte(client, REG_CRITICAL_TEMP); +} + +static int sg2042_mcu_get_repower_temp(struct i2c_client *client) +{ + return sg2042_mcu_read_byte(client, REG_REPOWER_TEMP); +} + +static int sg2042_mcu_set_critical_action(struct i2c_client *client, + u8 value) +{ + return sg2042_mcu_write_byte(client, REG_CRITICAL_ACTIONS, value); +} + +static int sg2042_mcu_set_critical_temp(struct i2c_client *client, + u8 value) +{ + return sg2042_mcu_write_byte(client, REG_CRITICAL_TEMP, value); +} + +static int sg2042_mcu_set_repower_temp(struct i2c_client *client, + u8 value) +{ + return sg2042_mcu_write_byte(client, REG_REPOWER_TEMP, value); +} + +static ssize_t board_type_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct sg2042_mcu_data *mcu = dev_get_drvdata(dev); + + return sprintf(buf, "%s\n", mcu->board_info->name ?: "Unknown"); +} + +DEFINE_MCU_ATTR_READ_FUNC(firmware_version, int, "0x%02x"); +DEFINE_MCU_ATTR_READ_FUNC(pcb_version, int, "0x%02x"); +DEFINE_MCU_ATTR_READ_FUNC(reset_count, int, "%d"); +DEFINE_MCU_ATTR_READ_FUNC(uptime, s32, "%d"); + +static ssize_t reset_reason_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct sg2042_mcu_data *mcu = dev_get_drvdata(dev); + int ret, val, i; + + val = sg2042_mcu_get_reset_reason(mcu->client); + if (val < 0) + return val; + + ret = sprintf(buf, "Reason: 0x%02x\n", val); + + for (i = 0; i < ARRAY_SIZE(sg2042_mcu_reset_reason); i++) { + if (val & BIT(i)) + ret += sprintf(buf + ret, "bit %d: %s\n", i, + sg2042_mcu_reset_reason[i]); + } + + return ret; +} + +static ssize_t mcu_type_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct sg2042_mcu_data *mcu = dev_get_drvdata(dev); + int ret; + + ret = sg2042_mcu_get_mcu_type(mcu->client); + if (ret < 0) + return ret; + + return sprintf(buf, ret ? "GD32\n" : "STM32\n"); +} + +static ssize_t critical_action_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct sg2042_mcu_data *mcu = dev_get_drvdata(dev); + int ret; + const char *action; + + ret = sg2042_mcu_get_critical_action(mcu->client); + if (ret < 0) + return ret; + + if (ret == CRITICAL_ACTION_REBOOT) + action = "reboot"; + else if (ret == CRITICAL_ACTION_POWEROFF) + action = "poweroff"; + else + action = "unknown"; + + return sprintf(buf, "%s\n", action); +} + +static ssize_t critical_action_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct sg2042_mcu_data *mcu = dev_get_drvdata(dev); + int value; + + if (sysfs_streq("reboot", buf)) + value = CRITICAL_ACTION_REBOOT; + else if (sysfs_streq("poweroff", buf)) + value = CRITICAL_ACTION_POWEROFF; + else + return -EINVAL; + + return sg2042_mcu_set_critical_action(mcu->client, value); +} + +DEFINE_MCU_ATTR_READ_FUNC(repower_temp, u32, "%u"); + +static ssize_t repower_temp_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct sg2042_mcu_data *mcu = dev_get_drvdata(dev); + u8 val; + int ret; + + ret = kstrtou8(buf, 10, &val); + if (ret < 0) + return ret; + + if (val == 0 || val > MAX_REPOWER_TEMP) + return -EINVAL; + + return sg2042_mcu_set_repower_temp(mcu->client, val); +} + +static DEVICE_ATTR_RO(board_type); +static DEVICE_ATTR_RO(firmware_version); +static DEVICE_ATTR_RO(pcb_version); +static DEVICE_ATTR_RO(reset_count); +static DEVICE_ATTR_RO(uptime); +static DEVICE_ATTR_RO(reset_reason); +static DEVICE_ATTR_RO(mcu_type); +static DEVICE_ATTR_RW(critical_action); +static DEVICE_ATTR_RW(repower_temp); + +static struct attribute *sg2042_mcu_attrs[] = { + &dev_attr_board_type.attr, + &dev_attr_firmware_version.attr, + &dev_attr_pcb_version.attr, + &dev_attr_reset_count.attr, + &dev_attr_uptime.attr, + &dev_attr_reset_reason.attr, + &dev_attr_mcu_type.attr, + &dev_attr_critical_action.attr, + &dev_attr_repower_temp.attr, + NULL +}; + +static const struct attribute_group sg2042_mcu_attr_group = { + .attrs = sg2042_mcu_attrs, +}; + +static const struct hwmon_channel_info * const sg2042_mcu_info[] = { + HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL), + HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_CRIT, + HWMON_T_INPUT), + NULL +}; + +static int sg2042_mcu_read_temp(struct device *dev, + u32 attr, int channel, + long *val) +{ + struct sg2042_mcu_data *mcu = dev_get_drvdata(dev); + long tmp; + + switch (attr) { + case hwmon_temp_input: + switch (channel) { + case 0: + tmp = sg2042_mcu_get_soc_temp(mcu->client); + if (tmp < 0) + return tmp; + *val = tmp * 1000; + break; + case 1: + tmp = sg2042_mcu_get_board_temp(mcu->client); + if (tmp < 0) + return tmp; + *val = tmp * 1000; + break; + default: + return -EOPNOTSUPP; + } + break; + case hwmon_temp_crit: + if (channel) + return -EOPNOTSUPP; + + tmp = sg2042_mcu_get_critical_temp(mcu->client); + if (tmp < 0) + return tmp; + *val = tmp * 1000; + break; + default: + return -EOPNOTSUPP; + } + return 0; +} + +static int sg2042_mcu_read(struct device *dev, + enum hwmon_sensor_types type, + u32 attr, int channel, long *val) +{ + switch (type) { + case hwmon_chip: + if (attr != hwmon_chip_update_interval) + return -EOPNOTSUPP; + *val = 1000; + break; + case hwmon_temp: + return sg2042_mcu_read_temp(dev, attr, channel, val); + default: + return -EOPNOTSUPP; + } + return 0; +} + +static int sg2042_mcu_write(struct device *dev, + enum hwmon_sensor_types type, + u32 attr, int channel, long val) +{ + struct sg2042_mcu_data *mcu = dev_get_drvdata(dev); + u8 down_temp, repower_temp; + int ret; + + if (type != hwmon_temp || attr != hwmon_temp_crit || !channel) + return -EOPNOTSUPP; + + ret = sg2042_mcu_get_repower_temp(mcu->client); + if (ret < 0) + repower_temp = DEFAULT_REPOWER_TEMP; + else + repower_temp = ret; + + down_temp = val / 1000; + if (down_temp < repower_temp) + return -EINVAL; + + return sg2042_mcu_set_critical_temp(mcu->client, (u8)(val / 1000)); +} + +static umode_t sg2042_mcu_is_visible(const void *_data, + enum hwmon_sensor_types type, + u32 attr, int channel) +{ + switch (type) { + case hwmon_chip: + if (attr == hwmon_chip_update_interval) + return 0444; + break; + case hwmon_temp: + switch (attr) { + case hwmon_temp_input: + if (channel < 2) + return 0444; + break; + case hwmon_temp_crit: + if (channel == 0) + return 0664; + break; + default: + return 0; + } + break; + default: + return 0; + } + return 0; +} + +static const struct hwmon_ops sg2042_mcu_ops = { + .is_visible = sg2042_mcu_is_visible, + .read = sg2042_mcu_read, + .write = sg2042_mcu_write, +}; + +static const struct hwmon_chip_info sg2042_mcu_chip_info = { + .ops = &sg2042_mcu_ops, + .info = sg2042_mcu_info, +}; + +static int sg2042_mcu_check_board(u8 id) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(sg2042_boards_data); i++) { + if (sg2042_boards_data[i].id == id) + return i; + } + + return -ENODEV; +} + +static int sg2042_mcu_i2c_probe(struct i2c_client *client) +{ + int ret; + struct device *dev = &client->dev; + struct sg2042_mcu_data *mcu; + struct device *hwmon_dev; + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA | + I2C_FUNC_SMBUS_BLOCK_DATA)) + return -EIO; + + ret = sg2042_mcu_get_board_type(client); + if (ret < 0) + return ret; + + ret = sg2042_mcu_check_board(ret); + if (ret < 0) + return ret; + + mcu = devm_kmalloc(dev, sizeof(*mcu), GFP_KERNEL); + if (!mcu) + return -ENOMEM; + + mcu->client = client; + mcu->board_info = &sg2042_boards_data[ret]; + + ret = sysfs_create_group(&dev->kobj, &sg2042_mcu_attr_group); + if (ret < 0) + return ret; + + i2c_set_clientdata(client, mcu); + + hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, + mcu, + &sg2042_mcu_chip_info, + NULL); + + return PTR_ERR_OR_ZERO(hwmon_dev); +} + +static void sg2042_mcu_i2c_remove(struct i2c_client *client) +{ + struct device *dev = &client->dev; + + sysfs_remove_group(&dev->kobj, &sg2042_mcu_attr_group); +} + +static const struct i2c_device_id sg2042_mcu_id[] = { + { "sg2042-hwmon-mcu", 0 }, + {}, +}; +MODULE_DEVICE_TABLE(i2c, sg2042_mcu_id); + +static const struct of_device_id sg2042_mcu_of_id[] = { + { .compatible = "sophgo,sg2042-hwmon-mcu" }, + {}, +}; +MODULE_DEVICE_TABLE(of, sg2042_mcu_of_id); + +static struct i2c_driver sg2042_mcu_driver = { + .driver = { + .name = "sg2042-mcu", + .of_match_table = sg2042_mcu_of_id, + }, + .probe = sg2042_mcu_i2c_probe, + .remove = sg2042_mcu_i2c_remove, + .id_table = sg2042_mcu_id, +}; + +module_i2c_driver(sg2042_mcu_driver); + +MODULE_DESCRIPTION("MCU I2C driver for bm16xx soc platform"); +MODULE_LICENSE("GPL"); -- 2.44.0