[PATCH V2 3/3] reset: hi6220: Reset driver for hisilicon hi6220 SoC

[Chen Feng <puck.chen-C8/M+/jPZTeaMJb+Lgu22Q@public.gmane.org>]

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

Signed-off-by: Chen Feng <puck.chen-C8/M+/jPZTeaMJb+Lgu22Q@public.gmane.org>
---
 drivers/reset/Kconfig                  |   1 +
 drivers/reset/Makefile                 |   1 +
 drivers/reset/hisilicon/Kconfig        |   5 ++
 drivers/reset/hisilicon/Makefile       |   1 +
 drivers/reset/hisilicon/hi6220_reset.c | 118 +++++++++++++++++++++++++++++++++
 5 files changed, 126 insertions(+)
 create mode 100644 drivers/reset/hisilicon/Kconfig
 create mode 100644 drivers/reset/hisilicon/Makefile
 create mode 100644 drivers/reset/hisilicon/hi6220_reset.c

diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index 0615f50..df37212 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 157d421..331d7b2 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -3,3 +3,4 @@ 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-$(CONFIG_ARCH_HISI) += hisilicon/
diff --git a/drivers/reset/hisilicon/Kconfig b/drivers/reset/hisilicon/Kconfig
new file mode 100644
index 0000000..26bf95a
--- /dev/null
+++ b/drivers/reset/hisilicon/Kconfig
@@ -0,0 +1,5 @@
+config COMMON_RESET_HI6220
+	tristate "Hi6220 Reset Driver"
+	depends on (ARCH_HISI && RESET_CONTROLLER)
+	help
+	  Build the Hisilicon Hi6220 reset driver.
diff --git a/drivers/reset/hisilicon/Makefile b/drivers/reset/hisilicon/Makefile
new file mode 100644
index 0000000..c932f86
--- /dev/null
+++ b/drivers/reset/hisilicon/Makefile
@@ -0,0 +1 @@
+obj-$(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 0000000..097133d
--- /dev/null
+++ b/drivers/reset/hisilicon/hi6220_reset.c
@@ -0,0 +1,118 @@
+/*
+ * Hisilicon Hi6220 reset controller driver
+ *
+ * Copyright (c) 2015 Hisilicon Limited.
+ *
+ * Author: Feng Chen <puck.chen-C8/M+/jPZTeaMJb+Lgu22Q@public.gmane.org>
+ *
+ * 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/init.h>
+#include <linux/bitops.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/reset-controller.h>
+#include <linux/reset.h>
+#include <linux/sizes.h>
+#include <linux/slab.h>
+
+#define ASSET_OFFSET            0x300
+#define DEASSET_OFFSET          0x304
+
+struct hi6220_reset_data {
+	spinlock_t			reset_lock; /*device spin-lock*/
+	void __iomem			*src_base;
+	void __iomem			*asset_base;
+	void __iomem			*deasset_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 = container_of(rc_dev,
+			struct hi6220_reset_data,
+			rc_dev);
+
+	unsigned long flags;
+	int bank = idx >> 8;
+	int offset = idx & 0xff;
+
+	spin_lock_irqsave(&data->reset_lock, flags);
+
+	writel(BIT(offset), data->asset_base + (bank * 0x10));
+
+	spin_unlock_irqrestore(&data->reset_lock, flags);
+
+	return 0;
+}
+
+static int hi6220_reset_deassert(struct reset_controller_dev *rc_dev,
+				 unsigned long idx)
+{
+	struct hi6220_reset_data *data = container_of(rc_dev,
+			struct hi6220_reset_data,
+			rc_dev);
+
+	unsigned long flags;
+	int bank = idx >> 8;
+	int offset = idx & 0xff;
+
+	spin_lock_irqsave(&data->reset_lock, flags);
+
+	writel(BIT(offset), data->deasset_base + (bank * 0x10));
+
+	spin_unlock_irqrestore(&data->reset_lock, flags);
+
+	return 0;
+}
+
+static struct reset_control_ops hi6220_reset_ops = {
+	.assert = hi6220_reset_assert,
+	.deassert = hi6220_reset_deassert,
+};
+
+static int __init hi6220_reset_init(void)
+{
+	int ret;
+	struct device_node *np;
+	struct hi6220_reset_data *data;
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	np = of_find_compatible_node(NULL, NULL, "hisilicon,hi6220_reset_ctl");
+	if (!np) {
+		ret = -ENXIO;
+		goto err_alloc;
+	}
+	spin_lock_init(&data->reset_lock);
+	data->src_base = of_iomap(np, 0);
+	if (!data->src_base) {
+		ret = -ENOMEM;
+		goto err_alloc;
+	}
+
+	data->asset_base = data->src_base + ASSET_OFFSET;
+	data->deasset_base = data->src_base + DEASSET_OFFSET;
+	data->rc_dev.owner = THIS_MODULE;
+	data->rc_dev.nr_resets = SZ_4K;
+	data->rc_dev.ops = &hi6220_reset_ops;
+	data->rc_dev.of_node = np;
+
+	if (IS_ENABLED(CONFIG_RESET_CONTROLLER))
+		reset_controller_register(&data->rc_dev);
+
+	return 0;
+
+err_alloc:
+	kfree(data);
+	return ret;
+}
+
+postcore_initcall(hi6220_reset_init);
-- 
1.9.1

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