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@xxxxxxxxxx>
---
drivers/reset/hisilicon/Kconfig | 7 ++
drivers/reset/hisilicon/Makefile | 1 +
drivers/reset/hisilicon/reset-hi3660.c | 126 +++++++++++++++++++++++++++++++++
3 files changed, 134 insertions(+)
create mode 100644 drivers/reset/hisilicon/reset-hi3660.c
diff --git a/drivers/reset/hisilicon/Kconfig b/drivers/reset/hisilicon/Kconfig
index 1ff8b0c..10134dc 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 c932f86..ab8a7bf 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 0000000..17d8bb12
--- /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");
--
2.7.4
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