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path: root/drivers/power/reset/syscon-reboot-mode.c
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Diffstat (limited to 'drivers/power/reset/syscon-reboot-mode.c')
-rw-r--r--drivers/power/reset/syscon-reboot-mode.c99
1 files changed, 99 insertions, 0 deletions
diff --git a/drivers/power/reset/syscon-reboot-mode.c b/drivers/power/reset/syscon-reboot-mode.c
new file mode 100644
index 000000000000..9e1cba5dd58e
--- /dev/null
+++ b/drivers/power/reset/syscon-reboot-mode.c
@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+#include "reboot-mode.h"
+
+struct syscon_reboot_mode {
+ struct regmap *map;
+ struct reboot_mode_driver reboot;
+ u32 offset;
+ u32 mask;
+};
+
+static int syscon_reboot_mode_write(struct reboot_mode_driver *reboot,
+ unsigned int magic)
+{
+ struct syscon_reboot_mode *syscon_rbm;
+ int ret;
+
+ syscon_rbm = container_of(reboot, struct syscon_reboot_mode, reboot);
+
+ ret = regmap_update_bits(syscon_rbm->map, syscon_rbm->offset,
+ syscon_rbm->mask, magic);
+ if (ret < 0)
+ dev_err(reboot->dev, "update reboot mode bits failed\n");
+
+ return ret;
+}
+
+static int syscon_reboot_mode_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct syscon_reboot_mode *syscon_rbm;
+
+ syscon_rbm = devm_kzalloc(&pdev->dev, sizeof(*syscon_rbm), GFP_KERNEL);
+ if (!syscon_rbm)
+ return -ENOMEM;
+
+ syscon_rbm->reboot.dev = &pdev->dev;
+ syscon_rbm->reboot.write = syscon_reboot_mode_write;
+ syscon_rbm->mask = 0xffffffff;
+
+ dev_set_drvdata(&pdev->dev, syscon_rbm);
+
+ syscon_rbm->map = syscon_node_to_regmap(pdev->dev.parent->of_node);
+ if (IS_ERR(syscon_rbm->map))
+ return PTR_ERR(syscon_rbm->map);
+
+ if (of_property_read_u32(pdev->dev.of_node, "offset",
+ &syscon_rbm->offset))
+ return -EINVAL;
+
+ of_property_read_u32(pdev->dev.of_node, "mask", &syscon_rbm->mask);
+
+ ret = reboot_mode_register(&syscon_rbm->reboot);
+ if (ret)
+ dev_err(&pdev->dev, "can't register reboot mode\n");
+
+ return ret;
+}
+
+static int syscon_reboot_mode_remove(struct platform_device *pdev)
+{
+ struct syscon_reboot_mode *syscon_rbm = dev_get_drvdata(&pdev->dev);
+
+ return reboot_mode_unregister(&syscon_rbm->reboot);
+}
+
+static const struct of_device_id syscon_reboot_mode_of_match[] = {
+ { .compatible = "syscon-reboot-mode" },
+ {}
+};
+
+static struct platform_driver syscon_reboot_mode_driver = {
+ .probe = syscon_reboot_mode_probe,
+ .remove = syscon_reboot_mode_remove,
+ .driver = {
+ .name = "syscon-reboot-mode",
+ .of_match_table = syscon_reboot_mode_of_match,
+ },
+};
+module_platform_driver(syscon_reboot_mode_driver);
+
+MODULE_AUTHOR("Andy Yan <andy.yan@rock-chips.com");
+MODULE_DESCRIPTION("SYSCON reboot mode driver");
+MODULE_LICENSE("GPL v2");