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path: root/drivers/reset/hisilicon/hi6220_reset.c
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Diffstat (limited to 'drivers/reset/hisilicon/hi6220_reset.c')
-rw-r--r--drivers/reset/hisilicon/hi6220_reset.c108
1 files changed, 108 insertions, 0 deletions
diff --git a/drivers/reset/hisilicon/hi6220_reset.c b/drivers/reset/hisilicon/hi6220_reset.c
new file mode 100644
index 000000000000..d17c910e8b63
--- /dev/null
+++ b/drivers/reset/hisilicon/hi6220_reset.c
@@ -0,0 +1,108 @@
+/*
+ * Hisilicon Hi6220 reset controller driver
+ *
+ * Copyright (c) 2015 Hisilicon Limited.
+ *
+ * Author: Feng Chen <puck.chen@hisilicon.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/io.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+#include <linux/of.h>
+#include <linux/reset-controller.h>
+#include <linux/reset.h>
+#include <linux/platform_device.h>
+
+#define ASSERT_OFFSET 0x300
+#define DEASSERT_OFFSET 0x304
+#define MAX_INDEX 0x509
+
+#define to_reset_data(x) container_of(x, struct hi6220_reset_data, rc_dev)
+
+struct hi6220_reset_data {
+ void __iomem *assert_base;
+ void __iomem *deassert_base;
+ struct reset_controller_dev rc_dev;
+};
+
+static int hi6220_reset_assert(struct reset_controller_dev *rc_dev,
+ unsigned long idx)
+{
+ struct hi6220_reset_data *data = to_reset_data(rc_dev);
+
+ int bank = idx >> 8;
+ int offset = idx & 0xff;
+
+ writel(BIT(offset), data->assert_base + (bank * 0x10));
+
+ return 0;
+}
+
+static int hi6220_reset_deassert(struct reset_controller_dev *rc_dev,
+ unsigned long idx)
+{
+ struct hi6220_reset_data *data = to_reset_data(rc_dev);
+
+ int bank = idx >> 8;
+ int offset = idx & 0xff;
+
+ writel(BIT(offset), data->deassert_base + (bank * 0x10));
+
+ return 0;
+}
+
+static struct reset_control_ops hi6220_reset_ops = {
+ .assert = hi6220_reset_assert,
+ .deassert = hi6220_reset_deassert,
+};
+
+static int hi6220_reset_probe(struct platform_device *pdev)
+{
+ struct hi6220_reset_data *data;
+ struct resource *res;
+ void __iomem *src_base;
+
+ data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ src_base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(src_base))
+ return PTR_ERR(src_base);
+
+ data->assert_base = src_base + ASSERT_OFFSET;
+ data->deassert_base = src_base + DEASSERT_OFFSET;
+ data->rc_dev.nr_resets = MAX_INDEX;
+ data->rc_dev.ops = &hi6220_reset_ops;
+ data->rc_dev.of_node = pdev->dev.of_node;
+
+ reset_controller_register(&data->rc_dev);
+
+ return 0;
+}
+
+static const struct of_device_id hi6220_reset_match[] = {
+ { .compatible = "hisilicon,hi6220-sysctrl" },
+ { },
+};
+
+static struct platform_driver hi6220_reset_driver = {
+ .probe = hi6220_reset_probe,
+ .driver = {
+ .name = "reset-hi6220",
+ .of_match_table = hi6220_reset_match,
+ },
+};
+
+static int __init hi6220_reset_init(void)
+{
+ return platform_driver_register(&hi6220_reset_driver);
+}
+
+postcore_initcall(hi6220_reset_init);