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The reset driver subsystem does not need any extra data, so it can use `struct fdt_driver` directly. The generic fdt_reset_init() performs a best-effort initialization of all matching DT nodes. Platform-specific logic expects exactly one DT node to match a single driver. This is accomplished by using fdt_driver_init_one() with a local list containing that one driver. Signed-off-by: Samuel Holland <samuel.holland@sifive.com> Reviewed-by: Anup Patel <anup@brainfault.org>
115 lines
2.4 KiB
C
115 lines
2.4 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2023 Lin Chunzhi <chunzhi.lin@sophgo.com>
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*/
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#include <libfdt.h>
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#include <sbi/sbi_hart.h>
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#include <sbi/sbi_types.h>
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#include <sbi/sbi_error.h>
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#include <sbi/sbi_system.h>
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#include <sbi/sbi_console.h>
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#include <sbi_utils/fdt/fdt_helper.h>
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#include <sbi_utils/reset/fdt_reset.h>
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#include <sbi_utils/i2c/fdt_i2c.h>
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#define MANGO_BOARD_TYPE_MASK 0x80
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#define REG_BOARD_TYPE 0x00
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#define REG_CMD 0x03
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#define CMD_POWEROFF 0x02
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#define CMD_RESET 0x03
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#define CMD_REBOOT 0x07
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static struct i2c_adapter *mcu_adapter = NULL;
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static uint32_t mcu_reg = 0;
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static int sg2042_mcu_reset_check(u32 type, u32 reason)
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{
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switch (type) {
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case SBI_SRST_RESET_TYPE_SHUTDOWN:
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return 1;
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case SBI_SRST_RESET_TYPE_COLD_REBOOT:
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case SBI_SRST_RESET_TYPE_WARM_REBOOT:
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return 255;
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}
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return 0;
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}
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static void sg2042_mcu_reset(u32 type, u32 reason)
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{
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switch (type) {
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case SBI_SRST_RESET_TYPE_SHUTDOWN:
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i2c_adapter_reg_write(mcu_adapter, mcu_reg,
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REG_CMD, CMD_POWEROFF);
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break;
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case SBI_SRST_RESET_TYPE_COLD_REBOOT:
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case SBI_SRST_RESET_TYPE_WARM_REBOOT:
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i2c_adapter_reg_write(mcu_adapter, mcu_reg,
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REG_CMD, CMD_REBOOT);
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break;
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}
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}
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static struct sbi_system_reset_device sg2042_mcu_reset_device = {
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.name = "sg2042-mcu-reset",
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.system_reset_check = sg2042_mcu_reset_check,
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.system_reset = sg2042_mcu_reset
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};
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static int sg2042_mcu_reset_check_board(struct i2c_adapter *adap, uint32_t reg)
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{
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static uint8_t val;
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int ret;
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/* check board type */
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ret = i2c_adapter_reg_read(adap, reg, REG_BOARD_TYPE, &val);
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if (ret)
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return ret;
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if (!(val & MANGO_BOARD_TYPE_MASK))
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return SBI_ENODEV;
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return 0;
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}
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static int sg2042_mcu_reset_init(const void *fdt, int nodeoff,
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const struct fdt_match *match)
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{
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int ret, i2c_bus;
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uint64_t addr;
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ret = fdt_get_node_addr_size(fdt, nodeoff, 0, &addr, NULL);
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if (ret)
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return ret;
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mcu_reg = addr;
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i2c_bus = fdt_parent_offset(fdt, nodeoff);
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if (i2c_bus < 0)
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return i2c_bus;
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ret = fdt_i2c_adapter_get(fdt, i2c_bus, &mcu_adapter);
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if (ret)
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return ret;
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ret = sg2042_mcu_reset_check_board(mcu_adapter, mcu_reg);
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sbi_system_reset_add_device(&sg2042_mcu_reset_device);
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return 0;
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}
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static const struct fdt_match sg2042_mcu_reset_match[] = {
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{ .compatible = "sophgo,sg2042-hwmon-mcu", .data = (void *)true},
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{ },
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};
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const struct fdt_driver fdt_reset_sg2042_mcu = {
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.match_table = sg2042_mcu_reset_match,
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.init = sg2042_mcu_reset_init,
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};
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