[PATCH v1 1/2] watchdog: loongson1: Add Loongson1 SoC watchdog driver

[Yang Ling]

Add watchdog timer specific driver for Loongson1 SoC.

Signed-off-by: Yang Ling 
---
 drivers/watchdog/Kconfig |   7 ++
 drivers/watchdog/Makefile|   1 +
 drivers/watchdog/loongson1_wdt.c | 158 +++
 3 files changed, 166 insertions(+)
 create mode 100644 drivers/watchdog/loongson1_wdt.c

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 50dbaa8..28c44f2 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1553,6 +1553,13 @@ config PIC32_DMT
  To compile this driver as a loadable module, choose M here.
  The module will be called pic32-dmt.
 
+config LOONGSON1_WDT
+   tristate "Loongson1 SoC hardware watchdog"
+   depends on MACH_LOONGSON32
+   select WATCHDOG_CORE
+   help
+ Hardware driver for the Loongson1 SoC Watchdog Timer.
+
 # PARISC Architecture
 
 # POWERPC Architecture
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index cba0043..bd3b00e 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -162,6 +162,7 @@ obj-$(CONFIG_IMGPDC_WDT) += imgpdc_wdt.o
 obj-$(CONFIG_MT7621_WDT) += mt7621_wdt.o
 obj-$(CONFIG_PIC32_WDT) += pic32-wdt.o
 obj-$(CONFIG_PIC32_DMT) += pic32-dmt.o
+obj-$(CONFIG_LOONGSON1_WDT) += loongson1_wdt.o
 
 # PARISC Architecture
 
diff --git a/drivers/watchdog/loongson1_wdt.c b/drivers/watchdog/loongson1_wdt.c
new file mode 100644
index 000..fe96e2c
--- /dev/null
+++ b/drivers/watchdog/loongson1_wdt.c
@@ -0,0 +1,158 @@
+/*
+ * Copyright (c) 2016 Yang Ling 
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under  the terms of the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#include 
+#include 
+#include 
+#include 
+
+#include 
+
+#define MIN_HEARTBEAT  1
+#define MAX_HEARTBEAT  30
+#define DEFAULT_HEARTBEAT  10
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0);
+
+static unsigned int heartbeat = DEFAULT_HEARTBEAT;
+module_param(heartbeat, uint, 0);
+
+struct ls1x_wdt_drvdata {
+   struct watchdog_device wdt;
+   void __iomem *base;
+   unsigned int count;
+   struct clk *clk;
+};
+
+static int ls1x_wdt_ping(struct watchdog_device *wdt_dev)
+{
+   struct ls1x_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
+
+   writel(0x1, drvdata->base + WDT_EN);
+   writel(drvdata->count, drvdata->base + WDT_TIMER);
+   writel(0x1, drvdata->base + WDT_SET);
+
+   return 0;
+}
+
+static int ls1x_wdt_set_timeout(struct watchdog_device *wdt_dev,
+   unsigned int new_timeout)
+{
+   struct ls1x_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
+   int counts_per_second;
+
+   if (watchdog_init_timeout(wdt_dev, new_timeout, NULL))
+   return -EINVAL;
+
+   counts_per_second = clk_get_rate(drvdata->clk);
+   drvdata->count = counts_per_second * wdt_dev->timeout;
+
+   ls1x_wdt_ping(wdt_dev);
+
+   return 0;
+}
+
+static int ls1x_wdt_start(struct watchdog_device *wdt_dev)
+{
+   ls1x_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
+
+   return 0;
+}
+
+static int ls1x_wdt_stop(struct watchdog_device *wdt_dev)
+{
+   struct ls1x_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
+
+   writel(0x0, drvdata->base + WDT_EN);
+
+   return 0;
+}
+
+static const struct watchdog_info ls1x_wdt_info = {
+   .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
+   .identity = "Loongson1 Watchdog",
+};
+
+static const struct watchdog_ops ls1x_wdt_ops = {
+   .owner = THIS_MODULE,
+   .start = ls1x_wdt_start,
+   .stop = ls1x_wdt_stop,
+   .ping = ls1x_wdt_ping,
+   .set_timeout = ls1x_wdt_set_timeout,
+};
+
+static int ls1x_wdt_probe(struct platform_device *pdev)
+{
+   struct ls1x_wdt_drvdata *drvdata;
+   struct watchdog_device *ls1x_wdt;
+   struct resource *res;
+   int ret;
+
+   drvdata = devm_kzalloc(>dev, sizeof(*drvdata), GFP_KERNEL);
+   if (!drvdata)
+   return -ENOMEM;
+
+   res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+   drvdata->base = devm_ioremap_resource(>dev, res);
+   if (IS_ERR(drvdata->base))
+   return PTR_ERR(drvdata->base);
+
+   drvdata->clk = devm_clk_get(>dev, pdev->name);
+   if (IS_ERR(drvdata->clk)) {
+   dev_err(>dev, "failed to get %s clock\n", pdev->name);
+   return PTR_ERR(drvdata->clk);
+   }
+   clk_prepare_enable(drvdata->clk);
+
+   ls1x_wdt = >wdt;
+   ls1x_wdt->info = _wdt_info;
+   ls1x_wdt->ops = _wdt_ops;
+   ls1x_wdt->timeout = heartbeat;
+   ls1x_wdt->min_timeout = MIN_HEARTBEAT;
+   ls1x_wdt->max_timeout = MAX_HEARTBEAT;
+   ls1x_wdt->parent = >dev;
+ 

[PATCH v1 1/2] watchdog: loongson1: Add Loongson1 SoC watchdog driver

[Yang Ling]

Add watchdog timer specific driver for Loongson1 SoC.

Signed-off-by: Yang Ling 
---
 drivers/watchdog/Kconfig |   7 ++
 drivers/watchdog/Makefile|   1 +
 drivers/watchdog/loongson1_wdt.c | 158 +++
 3 files changed, 166 insertions(+)
 create mode 100644 drivers/watchdog/loongson1_wdt.c

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 50dbaa8..28c44f2 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1553,6 +1553,13 @@ config PIC32_DMT
  To compile this driver as a loadable module, choose M here.
  The module will be called pic32-dmt.
 
+config LOONGSON1_WDT
+   tristate "Loongson1 SoC hardware watchdog"
+   depends on MACH_LOONGSON32
+   select WATCHDOG_CORE
+   help
+ Hardware driver for the Loongson1 SoC Watchdog Timer.
+
 # PARISC Architecture
 
 # POWERPC Architecture
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index cba0043..bd3b00e 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -162,6 +162,7 @@ obj-$(CONFIG_IMGPDC_WDT) += imgpdc_wdt.o
 obj-$(CONFIG_MT7621_WDT) += mt7621_wdt.o
 obj-$(CONFIG_PIC32_WDT) += pic32-wdt.o
 obj-$(CONFIG_PIC32_DMT) += pic32-dmt.o
+obj-$(CONFIG_LOONGSON1_WDT) += loongson1_wdt.o
 
 # PARISC Architecture
 
diff --git a/drivers/watchdog/loongson1_wdt.c b/drivers/watchdog/loongson1_wdt.c
new file mode 100644
index 000..fe96e2c
--- /dev/null
+++ b/drivers/watchdog/loongson1_wdt.c
@@ -0,0 +1,158 @@
+/*
+ * Copyright (c) 2016 Yang Ling 
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under  the terms of the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#include 
+#include 
+#include 
+#include 
+
+#include 
+
+#define MIN_HEARTBEAT  1
+#define MAX_HEARTBEAT  30
+#define DEFAULT_HEARTBEAT  10
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0);
+
+static unsigned int heartbeat = DEFAULT_HEARTBEAT;
+module_param(heartbeat, uint, 0);
+
+struct ls1x_wdt_drvdata {
+   struct watchdog_device wdt;
+   void __iomem *base;
+   unsigned int count;
+   struct clk *clk;
+};
+
+static int ls1x_wdt_ping(struct watchdog_device *wdt_dev)
+{
+   struct ls1x_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
+
+   writel(0x1, drvdata->base + WDT_EN);
+   writel(drvdata->count, drvdata->base + WDT_TIMER);
+   writel(0x1, drvdata->base + WDT_SET);
+
+   return 0;
+}
+
+static int ls1x_wdt_set_timeout(struct watchdog_device *wdt_dev,
+   unsigned int new_timeout)
+{
+   struct ls1x_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
+   int counts_per_second;
+
+   if (watchdog_init_timeout(wdt_dev, new_timeout, NULL))
+   return -EINVAL;
+
+   counts_per_second = clk_get_rate(drvdata->clk);
+   drvdata->count = counts_per_second * wdt_dev->timeout;
+
+   ls1x_wdt_ping(wdt_dev);
+
+   return 0;
+}
+
+static int ls1x_wdt_start(struct watchdog_device *wdt_dev)
+{
+   ls1x_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
+
+   return 0;
+}
+
+static int ls1x_wdt_stop(struct watchdog_device *wdt_dev)
+{
+   struct ls1x_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
+
+   writel(0x0, drvdata->base + WDT_EN);
+
+   return 0;
+}
+
+static const struct watchdog_info ls1x_wdt_info = {
+   .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
+   .identity = "Loongson1 Watchdog",
+};
+
+static const struct watchdog_ops ls1x_wdt_ops = {
+   .owner = THIS_MODULE,
+   .start = ls1x_wdt_start,
+   .stop = ls1x_wdt_stop,
+   .ping = ls1x_wdt_ping,
+   .set_timeout = ls1x_wdt_set_timeout,
+};
+
+static int ls1x_wdt_probe(struct platform_device *pdev)
+{
+   struct ls1x_wdt_drvdata *drvdata;
+   struct watchdog_device *ls1x_wdt;
+   struct resource *res;
+   int ret;
+
+   drvdata = devm_kzalloc(>dev, sizeof(*drvdata), GFP_KERNEL);
+   if (!drvdata)
+   return -ENOMEM;
+
+   res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+   drvdata->base = devm_ioremap_resource(>dev, res);
+   if (IS_ERR(drvdata->base))
+   return PTR_ERR(drvdata->base);
+
+   drvdata->clk = devm_clk_get(>dev, pdev->name);
+   if (IS_ERR(drvdata->clk)) {
+   dev_err(>dev, "failed to get %s clock\n", pdev->name);
+   return PTR_ERR(drvdata->clk);
+   }
+   clk_prepare_enable(drvdata->clk);
+
+   ls1x_wdt = >wdt;
+   ls1x_wdt->info = _wdt_info;
+   ls1x_wdt->ops = _wdt_ops;
+   ls1x_wdt->timeout = heartbeat;
+   ls1x_wdt->min_timeout = MIN_HEARTBEAT;
+   ls1x_wdt->max_timeout = MAX_HEARTBEAT;
+   ls1x_wdt->parent = >dev;
+   watchdog_set_nowayout(ls1x_wdt,