linux-kernel - [PATCH 1/9] reset: add the Berlin reset controller driver

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Message-Id: <1401983326-19205-2-git-send-email-antoine.tenart@free-electrons.com>
Date:	Thu,  5 Jun 2014 17:48:38 +0200
From:	Antoine Ténart 
	<antoine.tenart@...e-electrons.com>
To:	sebastian.hesselbarth@...il.com, p.zabel@...gutronix.de
Cc:	Antoine Ténart 
	<antoine.tenart@...e-electrons.com>,
	alexandre.belloni@...e-electrons.com,
	thomas.petazzoni@...e-electrons.com, zmxu@...vell.com,
	jszhang@...vell.com, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/9] reset: add the Berlin reset controller driver

Add a reset controller for Marvell Berlin SoCs which is used by the
USB PHYs drivers (for now).

Signed-off-by: Antoine Ténart <antoine.tenart@...e-electrons.com>
---
 drivers/reset/Makefile       |   1 +
 drivers/reset/reset-berlin.c | 113 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 114 insertions(+)
 create mode 100644 drivers/reset/reset-berlin.c

diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index 4f60caf750ce..fffe2a3dd255 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -1,3 +1,4 @@
 obj-$(CONFIG_RESET_CONTROLLER) += core.o
+obj-$(CONFIG_ARCH_BERLIN) += reset-berlin.o
 obj-$(CONFIG_ARCH_SUNXI) += reset-sunxi.o
 obj-$(CONFIG_ARCH_STI) += sti/
diff --git a/drivers/reset/reset-berlin.c b/drivers/reset/reset-berlin.c
new file mode 100644
index 000000000000..78b42c882cb2
--- /dev/null
+++ b/drivers/reset/reset-berlin.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright (C) 2014 Marvell Technology Group Ltd.
+ *
+ * Antoine Ténart <antoine.tenart@...e-electrons.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/reset-controller.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+
+#define BERLIN_RESET_REGISTER		0x104
+
+#define to_berlin_reset_priv(p)		\
+	container_of((p), struct berlin_reset_priv, rcdev)
+
+struct berlin_reset_priv {
+	spinlock_t			lock;
+	void __iomem			*base;
+	struct reset_controller_dev	rcdev;
+};
+
+static int berlin_reset_reset(struct reset_controller_dev *rcdev,
+			      unsigned long id)
+{
+	struct berlin_reset_priv *priv = to_berlin_reset_priv(rcdev);
+	unsigned long flags;
+	int bank = id / BITS_PER_LONG;
+	int offset = id % BITS_PER_LONG;
+
+	spin_lock_irqsave(&priv->lock, flags);
+
+	writel(BIT(offset), priv->base + bank * 4);
+
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	/* let the reset be effective */
+	udelay(10);
+
+	return 0;
+}
+
+static struct reset_control_ops berlin_reset_ops = {
+	.reset	= berlin_reset_reset,
+};
+
+static int __berlin_reset_init(struct device_node *np)
+{
+	struct berlin_reset_priv *priv;
+	struct resource res;
+	resource_size_t size;
+	int ret;
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	ret = of_address_to_resource(np, 0, &res);
+	if (ret)
+		goto err;
+
+	size = resource_size(&res);
+
+	priv->base = ioremap(res.start, size);
+	if (!priv->base) {
+		ret = -ENOMEM;
+		goto err;
+	}
+	priv->base += BERLIN_RESET_REGISTER;
+
+	priv->rcdev.owner = THIS_MODULE;
+	priv->rcdev.nr_resets = size * 32;
+	priv->rcdev.ops = &berlin_reset_ops;
+	priv->rcdev.of_node = np;
+
+	reset_controller_register(&priv->rcdev);
+
+	return 0;
+
+err:
+	kfree(priv);
+	return ret;
+}
+
+static const struct of_device_id berlin_reset_of_match[] __initdata = {
+	{ .compatible = "marvell,berlin2q-chip-ctrl" },
+	{ },
+};
+
+static int __init berlin_reset_init(void)
+{
+	struct device_node *np;
+	int ret;
+
+	for_each_matching_node(np, berlin_reset_of_match) {
+		ret = __berlin_reset_init(np);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+arch_initcall(berlin_reset_init);
-- 
1.9.1

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