GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/drivers/sysreset/sysreset_syscon.c

@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
+ *
+ * Derived from linux/drivers/power/reset/syscon-reboot.c:
+ *	Copyright (C) 2013, Applied Micro Circuits Corporation
+ *	Author: Feng Kan <fkan@apm.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <regmap.h>
+#include <sysreset.h>
+#include <syscon.h>
+
+struct syscon_reboot_priv {
+	struct regmap *regmap;
+	unsigned int offset;
+	unsigned int mask;
+};
+
+static int syscon_reboot_request(struct udevice *dev, enum sysreset_t type)
+{
+	struct syscon_reboot_priv *priv = dev_get_priv(dev);
+	ulong driver_data = dev_get_driver_data(dev);
+
+	if (type != driver_data)
+		return -EPROTONOSUPPORT;
+
+	regmap_write(priv->regmap, priv->offset, priv->mask);
+
+	return -EINPROGRESS;
+}
+
+static struct sysreset_ops syscon_reboot_ops = {
+	.request = syscon_reboot_request,
+};
+
+int syscon_reboot_probe(struct udevice *dev)
+{
+	struct syscon_reboot_priv *priv = dev_get_priv(dev);
+
+	priv->regmap = syscon_regmap_lookup_by_phandle(dev, "regmap");
+	if (IS_ERR(priv->regmap)) {
+		pr_err("unable to find regmap\n");
+		return -ENODEV;
+	}
+
+	priv->offset = dev_read_u32_default(dev, "offset", 0);
+	priv->mask = dev_read_u32_default(dev, "mask", 0);
+
+	return 0;
+}
+
+static const struct udevice_id syscon_reboot_ids[] = {
+	{ .compatible = "syscon-reboot", .data = SYSRESET_COLD },
+	{ .compatible = "syscon-poweroff", .data = SYSRESET_POWER_OFF },
+	{ /* sentinel */ }
+};
+
+U_BOOT_DRIVER(syscon_reboot) = {
+	.name = "syscon_reboot",
+	.id = UCLASS_SYSRESET,
+	.of_match = syscon_reboot_ids,
+	.probe = syscon_reboot_probe,
+	.priv_auto_alloc_size = sizeof(struct syscon_reboot_priv),
+	.ops = &syscon_reboot_ops,
+};