reset: hisilicon: add reset-hi3660

Add hi3660 reset driver
Example of dts usage:
	iomcu_rst: iomcu_rst_controller {
		compatible = "hisilicon,hi3660-reset";
		hisi,rst-syscon = <&iomcu>;
		#reset-cells = <2>;
	};

	i2c0: i2c@..... {
                ...
		resets = <&iomcu_rst 0x20 3>; /* offset: 0x20; bit: 3 */
                ...
        };

Signed-off-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

3 files changed, 134 insertions, 0 deletions

diff --git a/drivers/reset/hisilicon/Kconfig b/drivers/reset/hisilicon/Kconfig
index 1ff8b0c80980..10134dc03fe0 100644
--- a/drivers/reset/hisilicon/Kconfig
+++ b/drivers/reset/hisilicon/Kconfig
@@ -1,3 +1,10 @@
+config COMMON_RESET_HI3660
+        tristate "Hi3660 Reset Driver"
+        depends on ARCH_HISI || COMPILE_TEST
+        default ARCH_HISI
+        help
+          Build the Hisilicon Hi3660 reset driver.
+
 config COMMON_RESET_HI6220
         tristate "Hi6220 Reset Driver"
         depends on ARCH_HISI || COMPILE_TEST
diff --git a/drivers/reset/hisilicon/Makefile b/drivers/reset/hisilicon/Makefile
index c932f86e2f10..ab8a7bfcbd8d 100644
--- a/drivers/reset/hisilicon/Makefile
+++ b/drivers/reset/hisilicon/Makefile
@@ -1 +1,2 @@
 obj-$(CONFIG_COMMON_RESET_HI6220) += hi6220_reset.o
+obj-$(CONFIG_COMMON_RESET_HI3660) += reset-hi3660.o
diff --git a/drivers/reset/hisilicon/reset-hi3660.c b/drivers/reset/hisilicon/reset-hi3660.c
new file mode 100644
index 000000000000..17d8bb128e6e
--- /dev/null
+++ b/drivers/reset/hisilicon/reset-hi3660.c
@@ -0,0 +1,126 @@
+/*
+ * Copyright (c) 2016-2017 Linaro Ltd.
+ * Copyright (c) 2016-2017 HiSilicon Technologies 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/kernel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of_device.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 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, "hisi,rst-syscon");
+        if (IS_ERR(rc->map)) {
+                dev_err(dev, "failed to get hi3660,rst-syscon\n");
+                return PTR_ERR(rc->map);
+        }
+
+        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");