1 files changed, 127 insertions, 0 deletions
diff --git a/drivers/reset/hisilicon/reset-hi3660.c b/drivers/reset/hisilicon/reset-hi3660.c
new file mode 100644
index 000000000..1beb27527
--- /dev/null
+++ b/drivers/reset/hisilicon/reset-hi3660.c
@@ -0,0 +1,127 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2016-2017 Linaro Ltd.
+ * Copyright (c) 2016-2017 HiSilicon Technologies Co., Ltd.
+ */
+#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/reset-controller.h>
+
+struct hi3660_reset_controller {
+	struct reset_controller_dev rst;
+	struct regmap *map;
+};
+
+#define to_hi3660_reset_controller(_rst) \
+	container_of(_rst, struct hi3660_reset_controller, rst)
+
+static int hi3660_reset_program_hw(struct reset_controller_dev *rcdev,
+				   unsigned long idx, bool assert)
+{
+	struct hi3660_reset_controller *rc = to_hi3660_reset_controller(rcdev);
+	unsigned int offset = idx >> 8;
+	unsigned int mask = BIT(idx & 0x1f);
+
+	if (assert)
+		return regmap_write(rc->map, offset, mask);
+	else
+		return regmap_write(rc->map, offset + 4, mask);
+}
+
+static int hi3660_reset_assert(struct reset_controller_dev *rcdev,
+			       unsigned long idx)
+{
+	return hi3660_reset_program_hw(rcdev, idx, true);
+}
+
+static int hi3660_reset_deassert(struct reset_controller_dev *rcdev,
+				 unsigned long idx)
+{
+	return hi3660_reset_program_hw(rcdev, idx, false);
+}
+
+static int hi3660_reset_dev(struct reset_controller_dev *rcdev,
+			    unsigned long idx)
+{
+	int err;
+
+	err = hi3660_reset_assert(rcdev, idx);
+	if (err)
+		return err;
+
+	return hi3660_reset_deassert(rcdev, idx);
+}
+
+static const struct reset_control_ops hi3660_reset_ops = {
+	.reset    = hi3660_reset_dev,
+	.assert   = hi3660_reset_assert,
+	.deassert = hi3660_reset_deassert,
+};
+
+static int hi3660_reset_xlate(struct reset_controller_dev *rcdev,
+			      const struct of_phandle_args *reset_spec)
+{
+	unsigned int offset, bit;
+
+	offset = reset_spec->args[0];
+	bit = reset_spec->args[1];
+
+	return (offset << 8) | bit;
+}
+
+static int hi3660_reset_probe(struct platform_device *pdev)
+{
+	struct hi3660_reset_controller *rc;
+	struct device_node *np = pdev->dev.of_node;
+	struct device *dev = &pdev->dev;
+
+	rc = devm_kzalloc(dev, sizeof(*rc), GFP_KERNEL);
+	if (!rc)
+		return -ENOMEM;
+
+	rc->map = syscon_regmap_lookup_by_phandle(np, "hisilicon,rst-syscon");
+	if (rc->map == ERR_PTR(-ENODEV)) {
+		/* fall back to the deprecated compatible */
+		rc->map = syscon_regmap_lookup_by_phandle(np,
+							  "hisi,rst-syscon");
+	}
+	if (IS_ERR(rc->map)) {
+		return dev_err_probe(dev, PTR_ERR(rc->map),
+			"failed to get hisilicon,rst-syscon\n");
+	}
+
+	rc->rst.ops = &hi3660_reset_ops,
+	rc->rst.of_node = np;
+	rc->rst.of_reset_n_cells = 2;
+	rc->rst.of_xlate = hi3660_reset_xlate;
+
+	return reset_controller_register(&rc->rst);
+}
+
+static const struct of_device_id hi3660_reset_match[] = {
+	{ .compatible = "hisilicon,hi3660-reset", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, hi3660_reset_match);
+
+static struct platform_driver hi3660_reset_driver = {
+	.probe = hi3660_reset_probe,
+	.driver = {
+		.name = "hi3660-reset",
+		.of_match_table = hi3660_reset_match,
+	},
+};
+
+static int __init hi3660_reset_init(void)
+{
+	return platform_driver_register(&hi3660_reset_driver);
+}
+arch_initcall(hi3660_reset_init);
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:hi3660-reset");
+MODULE_DESCRIPTION("HiSilicon Hi3660 Reset Driver");