ARM: SAMSUNG: Add watchdog reset driver

This patch adds a watchdog reset driver that can be used on Samsung SoCs
that do not provide dedicated reset method. It replaces the legacy
helper function that relies on static IO mapping.

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
Tested-by: Sylwester Nawrocki <sylvester.nawrocki@gmail.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

1 files changed, 97 insertions, 0 deletions

diff --git a/arch/arm/plat-samsung/watchdog-reset.c b/arch/arm/plat-samsung/watchdog-reset.c
new file mode 100644
index 000000000000..2ecb50bea044
--- /dev/null
+++ b/arch/arm/plat-samsung/watchdog-reset.c
@@ -0,0 +1,97 @@
+/* arch/arm/plat-samsung/watchdog-reset.c
+ *
+ * Copyright (c) 2008 Simtec Electronics
+ *	Ben Dooks <ben@simtec.co.uk>
+ *
+ * Coyright (c) 2013 Tomasz Figa <tomasz.figa@gmail.com>
+ *
+ * Watchdog reset support for Samsung SoCs.
+ *
+ * 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/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+#define S3C2410_WTCON			0x00
+#define S3C2410_WTDAT			0x04
+#define S3C2410_WTCNT			0x08
+
+#define S3C2410_WTCON_ENABLE		(1 << 5)
+#define S3C2410_WTCON_DIV16		(0 << 3)
+#define S3C2410_WTCON_RSTEN		(1 << 0)
+#define S3C2410_WTCON_PRESCALE(x)	((x) << 8)
+
+static void __iomem *wdt_base;
+static struct clk *wdt_clock;
+
+void samsung_wdt_reset(void)
+{
+	if (!wdt_base) {
+		pr_err("%s: wdt reset not initialized\n", __func__);
+		/* delay to allow the serial port to show the message */
+		mdelay(50);
+		return;
+	}
+
+	if (!IS_ERR(wdt_clock))
+		clk_prepare_enable(wdt_clock);
+
+	/* disable watchdog, to be safe  */
+	__raw_writel(0, wdt_base + S3C2410_WTCON);
+
+	/* put initial values into count and data */
+	__raw_writel(0x80, wdt_base + S3C2410_WTCNT);
+	__raw_writel(0x80, wdt_base + S3C2410_WTDAT);
+
+	/* set the watchdog to go and reset... */
+	__raw_writel(S3C2410_WTCON_ENABLE | S3C2410_WTCON_DIV16 |
+			S3C2410_WTCON_RSTEN | S3C2410_WTCON_PRESCALE(0x20),
+			wdt_base + S3C2410_WTCON);
+
+	/* wait for reset to assert... */
+	mdelay(500);
+
+	pr_err("Watchdog reset failed to assert reset\n");
+
+	/* delay to allow the serial port to show the message */
+	mdelay(50);
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id s3c2410_wdt_match[] = {
+	{ .compatible = "samsung,s3c2410-wdt" },
+	{},
+};
+
+void __init samsung_wdt_reset_of_init(void)
+{
+	struct device_node *np;
+
+	np = of_find_matching_node(NULL, s3c2410_wdt_match);
+	if (!np) {
+		pr_err("%s: failed to find watchdog node\n", __func__);
+		return;
+	}
+
+	wdt_base = of_iomap(np, 0);
+	if (!wdt_base) {
+		pr_err("%s: failed to map watchdog registers\n", __func__);
+		return;
+	}
+
+	wdt_clock = of_clk_get(np, 0);
+}
+#endif
+
+void __init samsung_wdt_reset_init(void __iomem *base)
+{
+	wdt_base = base;
+	wdt_clock = clk_get(NULL, "watchdog");
+}