reset: hi6220: Reset driver for hisilicon hi6220 SoC

Add reset driver for hi6220-hikey board,this driver supply deassert
of IP on hi6220 SoC.

Signed-off-by: Chen Feng <puck.chen@hisilicon.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

5 files changed, 116 insertions, 0 deletions

diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index 0615f50a14cd..df37212a5cbd 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -13,3 +13,4 @@ menuconfig RESET_CONTROLLER
           If unsure, say no.
 
 source "drivers/reset/sti/Kconfig"
+source "drivers/reset/hisilicon/Kconfig"
diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index f191cf33be16..4d7178e46afa 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -4,5 +4,6 @@ obj-$(CONFIG_ARCH_SOCFPGA) += reset-socfpga.o
 obj-$(CONFIG_ARCH_BERLIN) += reset-berlin.o
 obj-$(CONFIG_ARCH_SUNXI) += reset-sunxi.o
 obj-$(CONFIG_ARCH_STI) += sti/
+obj-$(CONFIG_ARCH_HISI) += hisilicon/
 obj-$(CONFIG_ARCH_ZYNQ) += reset-zynq.o
 obj-$(CONFIG_ATH79) += reset-ath79.o
diff --git a/drivers/reset/hisilicon/Kconfig b/drivers/reset/hisilicon/Kconfig
new file mode 100644
index 000000000000..26bf95a83a8e
--- /dev/null
+++ b/drivers/reset/hisilicon/Kconfig
@@ -0,0 +1,5 @@
+config COMMON_RESET_HI6220
+        tristate "Hi6220 Reset Driver"
+        depends on (ARCH_HISI && RESET_CONTROLLER)
+        help
+          Build the Hisilicon Hi6220 reset driver.
diff --git a/drivers/reset/hisilicon/Makefile b/drivers/reset/hisilicon/Makefile
new file mode 100644
index 000000000000..c932f86e2f10
--- /dev/null
+++ b/drivers/reset/hisilicon/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_COMMON_RESET_HI6220) += hi6220_reset.o
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);