lib:utils:add sophgo-mcu, power management device

lib/utils/reset/Kconfig

@@ -29,6 +29,11 @@ config FDT_RESET_SIFIVE_TEST
 	select SYS_SIFIVE_TEST
 	default n
 
+config FDT_RESET_SOPHGO_MCU
+	bool "Sophgo MCU FDT reset driver"
+	select SYS_SOPHGO_MCU
+	default n
+
 config FDT_RESET_SUNXI_WDT
 	bool "Sunxi WDT FDT reset driver"
 	default n

lib/utils/reset/fdt_reset_sophgo_mcu.c

@@ -0,0 +1,155 @@
+/*
+ * 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		0x80
+
+#define REG_MCU_BOARD_TYPE		0x00
+#define REG_MCU_CMD		0x03
+
+#define CMD_POWEROFF		0x02
+#define CMD_RESET		0x03
+#define CMD_REBOOT		0x07
+
+static struct {
+	struct i2c_adapter *adapter;
+	uint32_t reg;
+} mango;
+
+static int mango_system_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 inline int mango_sanity_check(struct i2c_adapter *adap, uint32_t reg)
+{
+	static uint8_t val;
+	int ret;
+
+	/* check board type*/
+	ret = i2c_adapter_reg_read(adap, reg, REG_MCU_BOARD_TYPE, &val);
+	if (ret)
+		return ret;
+
+	if (val != MANGO_BOARD_TYPE)
+		return SBI_ENODEV;
+
+	return 0;
+}
+
+static inline int mango_shutdown(struct i2c_adapter *adap, uint32_t reg)
+{
+	int ret;
+	ret = i2c_adapter_reg_write(adap, reg, REG_MCU_CMD, CMD_POWEROFF);
+
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static inline int mango_reset(struct i2c_adapter *adap, uint32_t reg)
+{
+	int ret;
+	ret = i2c_adapter_reg_write(adap, reg, REG_MCU_CMD, CMD_REBOOT);
+
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static void mango_system_reset(u32 type, u32 reason)
+{
+	struct i2c_adapter *adap = mango.adapter;
+	uint32_t reg = mango.reg;
+	int ret;
+	if (adap) {
+		/* sanity check */
+		ret = mango_sanity_check(adap, reg);
+		if (ret) {
+			sbi_printf("%s: chip is not mango\n", __func__);
+			goto skip_reset;
+		}
+
+		switch (type) {
+		case SBI_SRST_RESET_TYPE_SHUTDOWN:
+			mango_shutdown(adap, reg);
+			break;
+		case SBI_SRST_RESET_TYPE_COLD_REBOOT:
+		case SBI_SRST_RESET_TYPE_WARM_REBOOT:
+			mango_reset(adap, reg);
+			break;
+		}
+	}
+
+skip_reset:
+	sbi_hart_hang();
+}
+
+static struct sbi_system_reset_device mango_reset_i2c = {
+	.name = "mango-reset",
+	.system_reset_check = mango_system_reset_check,
+	.system_reset = mango_system_reset
+};
+
+static int mango_reset_init(void *fdt, int nodeoff,
+			   const struct fdt_match *match)
+{
+	int rc, i2c_bus;
+	struct i2c_adapter *adapter;
+	uint64_t addr;
+
+	/* we are mango,mcu node */
+	rc = fdt_get_node_addr_size(fdt, nodeoff, 0, &addr, NULL);
+	if (rc)
+		return rc;
+
+	mango.reg = addr;
+
+	/* find i2c bus parent node */
+	i2c_bus = fdt_parent_offset(fdt, nodeoff);
+	if (i2c_bus < 0)
+		return i2c_bus;
+
+	/* i2c adapter get */
+	rc = fdt_i2c_adapter_get(fdt, i2c_bus, &adapter);
+	if (rc)
+		return rc;
+
+	mango.adapter = adapter;
+
+	sbi_system_reset_add_device(&mango_reset_i2c);
+
+	return 0;
+}
+
+static const struct fdt_match mango_reset_match[] = {
+	{ .compatible = "mango,reset", .data = (void *)true},
+	{ },
+};
+
+struct fdt_reset fdt_reset_sophgo_mcu = {
+	.match_table = mango_reset_match,
+	.init = mango_reset_init,
+};

lib/utils/reset/objects.mk

@@ -23,6 +23,9 @@ libsbiutils-objs-$(CONFIG_FDT_RESET_HTIF) += reset/fdt_reset_htif.o
 carray-fdt_reset_drivers-$(CONFIG_FDT_RESET_SIFIVE_TEST) += fdt_reset_sifive_test
 libsbiutils-objs-$(CONFIG_FDT_RESET_SIFIVE_TEST) += reset/fdt_reset_sifive_test.o
 
+carray-fdt_reset_drivers-$(CONFIG_FDT_RESET_SOPHGO_MCU) += fdt_reset_sophgo_mcu
+libsbiutils-objs-$(CONFIG_FDT_RESET_SOPHGO_MCU) += reset/fdt_reset_sophgo_mcu.o
+
 carray-fdt_reset_drivers-$(CONFIG_FDT_RESET_SUNXI_WDT) += fdt_reset_sunxi_wdt
 libsbiutils-objs-$(CONFIG_FDT_RESET_SUNXI_WDT) += reset/fdt_reset_sunxi_wdt.o
 

platform/generic/configs/defconfig

@@ -23,6 +23,7 @@ CONFIG_FDT_RESET_ATCWDT200=y
 CONFIG_FDT_RESET_GPIO=y
 CONFIG_FDT_RESET_HTIF=y
 CONFIG_FDT_RESET_SIFIVE_TEST=y
+CONFIG_FDT_RESET_SOPHGO_MCU=y
 CONFIG_FDT_RESET_SUNXI_WDT=y
 CONFIG_FDT_RESET_THEAD=y
 CONFIG_FDT_SERIAL=y