Berlin Driver changes for v3.19 (round 1)

- Reset driver, Acked by Philipp Zabel -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJUVg9xAAoJEN2kpao7fSL4y1IP/0Phv0XWjkTAVUO37tWG7n/X F2zEbRaKJ7Dzjb/4PPiON0rDqCm3b9riAeo9DNwapYaM3LrUq8vdtGPX6GyhwjdR kR6EafSVPCHSa2qxP/S0R5CyT/+ZNAjgKPv4Rxatb1PIgR4njVt1zJOKsNZvQXTZ vuwIh5qym3is6T0a2LrERZwJQytp+CjqzqkwcNlLFfmI0SzCOhA3SLZXYQDJqI19 2aOsWqwo7YUKYQRKQ0pETvhaODBvEKMwQ6QtnUzKVYE6+INKYrZm7MItSkt/ee4V emP1jx9yzQAPr3jqD2sF0AilDrh0pVAZrroCMeUUtDXGQnQ98sjgBPT+Iv1QHE7P KfgBzbRe5P4++bgJsePLOSvKfvqImUToAaEktqpV8J7FVe4Bqjp8f83vS/8X9UiF 0ApsUxf9pavw0ibYq0iRAO9lunLIZ8F/ooLzxf4h+M+p5A4dA7YsYY4gkPcxnhUW MG0u5lK51ZX0USApCV4oTt/v9LwzNsDGUa6YZ1LyAhZiQZpoFqH/5fw+yV56ltRv 90UYdaNwTuy93xeKd5fbEbsSm3OR+yDXVizXnMNjEbIIjTzuv4ETtrx6Mzq86Xh4 AoUQc+lqNxQ5pqsiouRtFQbGvUmgu6aIUYBTV+KrEblhRJ3A9+/LZ/T1Aq4lduAY CR990F42KkZSrKy3l912 =5cUT -----END PGP SIGNATURE----- Merge tag 'berlin-driver-3.19-1' of git://git.infradead.org/users/hesselba/linux-berlin into next/drivers Merge "ARM: berlin: Driver changes for v3.19 (round 1)" from Sebastian Hesselbarth: Berlin Driver changes for v3.19 (round 1) - Reset driver, Acked by Philipp Zabel * tag 'berlin-driver-3.19-1' of git://git.infradead.org/users/hesselba/linux-berlin: reset: add the Berlin reset controller driver Signed-off-by: Olof Johansson <olof@lixom.net>
2025-01-01 06:42:31 +00:00 · 2014-11-08 16:41:37 -08:00 · 2014-11-08 16:41:37 -08:00 · fe9b86fb26
commit fe9b86fb26
parent 0df1f2487d bd13251f71
2 changed files with 132 additions and 0 deletions
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@ -1,4 +1,5 @@
 obj-$(CONFIG_RESET_CONTROLLER) += core.o
 obj-$(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/
--- a/drivers/reset/reset-berlin.c
+++ b/drivers/reset/reset-berlin.c
@ -0,0 +1,131 @@
+/*
+ * Copyright (C) 2014 Marvell Technology Group Ltd.
+ *
+ * Antoine Tenart <antoine.tenart@free-electrons.com>
+ * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.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/types.h>
+
+#define BERLIN_MAX_RESETS	32
+
+#define to_berlin_reset_priv(p)		\
+	container_of((p), struct berlin_reset_priv, rcdev)
+
+struct berlin_reset_priv {
+	void __iomem			*base;
+	unsigned int			size;
+	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);
+	int offset = id >> 8;
+	int mask = BIT(id & 0x1f);
+
+	writel(mask, priv->base + offset);
+
+	/* 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_xlate(struct reset_controller_dev *rcdev,
+			      const struct of_phandle_args *reset_spec)
+{
+	struct berlin_reset_priv *priv = to_berlin_reset_priv(rcdev);
+	unsigned offset, bit;
+
+	if (WARN_ON(reset_spec->args_count != rcdev->of_reset_n_cells))
+		return -EINVAL;
+
+	offset = reset_spec->args[0];
+	bit = reset_spec->args[1];
+
+	if (offset >= priv->size)
+		return -EINVAL;
+
+	if (bit >= BERLIN_MAX_RESETS)
+		return -EINVAL;
+
+	return (offset << 8) | bit;
+}
+
+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->size = size;
+
+	priv->rcdev.owner = THIS_MODULE;
+	priv->rcdev.ops = &berlin_reset_ops;
+	priv->rcdev.of_node = np;
+	priv->rcdev.of_reset_n_cells = 2;
+	priv->rcdev.of_xlate = berlin_reset_xlate;
+
+	reset_controller_register(&priv->rcdev);
+
+	return 0;
+
+err:
+	kfree(priv);
+	return ret;
+}
+
+static const struct of_device_id berlin_reset_of_match[] __initconst = {
+	{ .compatible = "marvell,berlin2-chip-ctrl" },
+	{ .compatible = "marvell,berlin2cd-chip-ctrl" },
+	{ .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);