trunk-47381HEADmaster

1 files changed, 107 insertions, 0 deletions

diff --git a/target/linux/oxnas/files/drivers/reset/reset-ox820.c b/target/linux/oxnas/files/drivers/reset/reset-ox820.c
new file mode 100644
index 0000000..0a28de5
--- /dev/null
+++ b/target/linux/oxnas/files/drivers/reset/reset-ox820.c
@@ -0,0 +1,107 @@
+/*
+ * 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/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/reset-controller.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <mach/hardware.h>
+
+static int ox820_reset_reset(struct reset_controller_dev *rcdev,
+			      unsigned long id)
+{
+	writel(BIT(id), SYS_CTRL_RST_SET_CTRL);
+	writel(BIT(id), SYS_CTRL_RST_CLR_CTRL);
+	return 0;
+}
+
+static int ox820_reset_assert(struct reset_controller_dev *rcdev,
+			      unsigned long id)
+{
+	writel(BIT(id), SYS_CTRL_RST_SET_CTRL);
+
+	return 0;
+}
+
+static int ox820_reset_deassert(struct reset_controller_dev *rcdev,
+				unsigned long id)
+{
+	writel(BIT(id), SYS_CTRL_RST_CLR_CTRL);
+
+	return 0;
+}
+
+static struct reset_control_ops ox820_reset_ops = {
+	.reset		= ox820_reset_reset,
+	.assert		= ox820_reset_assert,
+	.deassert	= ox820_reset_deassert,
+};
+
+static const struct of_device_id ox820_reset_dt_ids[] = {
+	 { .compatible = "plxtech,nas782x-reset", },
+	 { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, ox820_reset_dt_ids);
+
+struct reset_controller_dev rcdev;
+
+static int ox820_reset_probe(struct platform_device *pdev)
+{
+	struct reset_controller_dev *rcdev;
+
+	rcdev = devm_kzalloc(&pdev->dev, sizeof(*rcdev), GFP_KERNEL);
+	if (!rcdev)
+		return -ENOMEM;
+
+	/* note: reset controller is statically mapped */
+
+	rcdev->owner = THIS_MODULE;
+	rcdev->nr_resets = 32;
+	rcdev->ops = &ox820_reset_ops;
+	rcdev->of_node = pdev->dev.of_node;
+	reset_controller_register(rcdev);
+	platform_set_drvdata(pdev, rcdev);
+
+	return 0;
+}
+
+static int ox820_reset_remove(struct platform_device *pdev)
+{
+	struct reset_controller_dev *rcdev = platform_get_drvdata(pdev);
+
+	reset_controller_unregister(rcdev);
+
+	return 0;
+}
+
+static struct platform_driver ox820_reset_driver = {
+	.probe	= ox820_reset_probe,
+	.remove	= ox820_reset_remove,
+	.driver = {
+		.name		= "ox820-reset",
+		.owner		= THIS_MODULE,
+		.of_match_table	= ox820_reset_dt_ids,
+	},
+};
+
+static int __init ox820_reset_init(void)
+{
+	return platform_driver_probe(&ox820_reset_driver,
+				     ox820_reset_probe);
+}
+/*
+ * reset controller does not support probe deferral, so it has to be
+ * initialized before any user, in particular, PCIE uses subsys_initcall.
+ */
+arch_initcall(ox820_reset_init);
+
+MODULE_AUTHOR("Ma Haijun");
+MODULE_LICENSE("GPL");