watchdog: add JZ4740 watchdog driver

Adds support for the hardware watchdog found in Ingenic's jz4740
System-on-Chip.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

3 files changed, 322 insertions, 0 deletions

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 229a9c1506b6..6041692e2107 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -905,6 +905,12 @@ config INDYDOG
           timer expired and no process has written to /dev/watchdog during
           that time.
 
+config JZ4740_WDT
+        tristate "Ingenic jz4740 SoC hardware watchdog"
+        depends on MACH_JZ4740
+        help
+          Hardware driver for the built-in watchdog timer on Ingenic jz4740 SoCs.
+
 config WDT_MTX1
         tristate "MTX-1 Hardware Watchdog"
         depends on MIPS_MTX1
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 20e44c4782b3..fd9c8c073a0a 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -114,6 +114,7 @@ obj-$(CONFIG_BCM47XX_WDT) += bcm47xx_wdt.o
 obj-$(CONFIG_BCM63XX_WDT) += bcm63xx_wdt.o
 obj-$(CONFIG_RC32434_WDT) += rc32434_wdt.o
 obj-$(CONFIG_INDYDOG) += indydog.o
+obj-$(CONFIG_JZ4740_WDT) += jz4740_wdt.o
 obj-$(CONFIG_WDT_MTX1) += mtx-1_wdt.o
 obj-$(CONFIG_PNX833X_WDT) += pnx833x_wdt.o
 obj-$(CONFIG_SIBYTE_WDOG) += sb_wdog.o
diff --git a/drivers/watchdog/jz4740_wdt.c b/drivers/watchdog/jz4740_wdt.c
new file mode 100644
index 000000000000..935562322b38
--- /dev/null
+++ b/drivers/watchdog/jz4740_wdt.c
@@ -0,0 +1,315 @@
+/*
+ *  Copyright (C) 2010, Paul Cercueil <paul@crapouillou.net>
+ *  JZ4740 Watchdog driver
+ *
+ *  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.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
+#include <linux/device.h>
+#include <linux/clk.h>
+#include <linux/slab.h>
+
+#include <asm/mach-jz4740/timer.h>
+
+#define JZ_REG_WDT_TIMER_DATA     0x0
+#define JZ_REG_WDT_COUNTER_ENABLE 0x4
+#define JZ_REG_WDT_TIMER_COUNTER  0x8
+#define JZ_REG_WDT_TIMER_CONTROL  0xC
+
+#define JZ_WDT_CLOCK_PCLK 0x1
+#define JZ_WDT_CLOCK_RTC  0x2
+#define JZ_WDT_CLOCK_EXT  0x4
+
+#define WDT_IN_USE        0
+#define WDT_OK_TO_CLOSE   1
+
+#define JZ_WDT_CLOCK_DIV_SHIFT   3
+
+#define JZ_WDT_CLOCK_DIV_1    (0 << JZ_WDT_CLOCK_DIV_SHIFT)
+#define JZ_WDT_CLOCK_DIV_4    (1 << JZ_WDT_CLOCK_DIV_SHIFT)
+#define JZ_WDT_CLOCK_DIV_16   (2 << JZ_WDT_CLOCK_DIV_SHIFT)
+#define JZ_WDT_CLOCK_DIV_64   (3 << JZ_WDT_CLOCK_DIV_SHIFT)
+#define JZ_WDT_CLOCK_DIV_256  (4 << JZ_WDT_CLOCK_DIV_SHIFT)
+#define JZ_WDT_CLOCK_DIV_1024 (5 << JZ_WDT_CLOCK_DIV_SHIFT)
+
+#define DEFAULT_HEARTBEAT 5
+#define MAX_HEARTBEAT     2048
+
+static struct {
+        void __iomem *base;
+        struct resource *mem;
+        struct clk *rtc_clk;
+        unsigned long status;
+} jz4740_wdt;
+
+static int heartbeat = DEFAULT_HEARTBEAT;
+
+
+static void jz4740_wdt_service(void)
+{
+        writew(0x0, jz4740_wdt.base + JZ_REG_WDT_TIMER_COUNTER);
+}
+
+static void jz4740_wdt_set_heartbeat(int new_heartbeat)
+{
+        unsigned int rtc_clk_rate;
+        unsigned int timeout_value;
+        unsigned short clock_div = JZ_WDT_CLOCK_DIV_1;
+
+        heartbeat = new_heartbeat;
+
+        rtc_clk_rate = clk_get_rate(jz4740_wdt.rtc_clk);
+
+        timeout_value = rtc_clk_rate * heartbeat;
+        while (timeout_value > 0xffff) {
+                if (clock_div == JZ_WDT_CLOCK_DIV_1024) {
+                        /* Requested timeout too high;
+                        * use highest possible value. */
+                        timeout_value = 0xffff;
+                        break;
+                }
+                timeout_value >>= 2;
+                clock_div += (1 << JZ_WDT_CLOCK_DIV_SHIFT);
+        }
+
+        writeb(0x0, jz4740_wdt.base + JZ_REG_WDT_COUNTER_ENABLE);
+        writew(clock_div, jz4740_wdt.base + JZ_REG_WDT_TIMER_CONTROL);
+
+        writew((u16)timeout_value, jz4740_wdt.base + JZ_REG_WDT_TIMER_DATA);
+        writew(0x0, jz4740_wdt.base + JZ_REG_WDT_TIMER_COUNTER);
+        writew(clock_div | JZ_WDT_CLOCK_RTC,
+                jz4740_wdt.base + JZ_REG_WDT_TIMER_CONTROL);
+
+        writeb(0x1, jz4740_wdt.base + JZ_REG_WDT_COUNTER_ENABLE);
+}
+
+static void jz4740_wdt_enable(void)
+{
+        jz4740_timer_enable_watchdog();
+        jz4740_wdt_set_heartbeat(heartbeat);
+}
+
+static void jz4740_wdt_disable(void)
+{
+        jz4740_timer_disable_watchdog();
+        writeb(0x0, jz4740_wdt.base + JZ_REG_WDT_COUNTER_ENABLE);
+}
+
+static int jz4740_wdt_open(struct inode *inode, struct file *file)
+{
+        if (test_and_set_bit(WDT_IN_USE, &jz4740_wdt.status))
+                return -EBUSY;
+
+        jz4740_wdt_enable();
+
+        return nonseekable_open(inode, file);
+}
+
+static ssize_t jz4740_wdt_write(struct file *file, const char *data,
+                size_t len, loff_t *ppos)
+{
+        if (len) {
+                if (data[len-1] == 'V')
+                        set_bit(WDT_OK_TO_CLOSE, &jz4740_wdt.status);
+                else
+                        clear_bit(WDT_OK_TO_CLOSE, &jz4740_wdt.status);
+
+                jz4740_wdt_service();
+        }
+
+        return len;
+}
+
+static const struct watchdog_info ident = {
+        .options = WDIOF_KEEPALIVEPING,
+        .identity = "jz4740 Watchdog",
+};
+
+static long jz4740_wdt_ioctl(struct file *file,
+                                        unsigned int cmd, unsigned long arg)
+{
+        int ret = -ENOTTY;
+        int heartbeat_seconds;
+
+        switch (cmd) {
+        case WDIOC_GETSUPPORT:
+                ret = copy_to_user((struct watchdog_info *)arg, &ident,
+                                sizeof(ident)) ? -EFAULT : 0;
+                break;
+
+        case WDIOC_GETSTATUS:
+        case WDIOC_GETBOOTSTATUS:
+                ret = put_user(0, (int *)arg);
+                break;
+
+        case WDIOC_KEEPALIVE:
+                jz4740_wdt_service();
+                return 0;
+
+        case WDIOC_SETTIMEOUT:
+                if (get_user(heartbeat_seconds, (int __user *)arg))
+                        return -EFAULT;
+
+                jz4740_wdt_set_heartbeat(heartbeat_seconds);
+                return 0;
+
+        case WDIOC_GETTIMEOUT:
+                return put_user(heartbeat, (int *)arg);
+
+        default:
+                break;
+        }
+
+        return ret;
+}
+
+static int jz4740_wdt_release(struct inode *inode, struct file *file)
+{
+        jz4740_wdt_service();
+
+        if (test_and_clear_bit(WDT_OK_TO_CLOSE, &jz4740_wdt.status))
+                jz4740_wdt_disable();
+
+        clear_bit(WDT_IN_USE, &jz4740_wdt.status);
+        return 0;
+}
+
+static const struct file_operations jz4740_wdt_fops = {
+        .owner = THIS_MODULE,
+        .llseek = no_llseek,
+        .write = jz4740_wdt_write,
+        .unlocked_ioctl = jz4740_wdt_ioctl,
+        .open = jz4740_wdt_open,
+        .release = jz4740_wdt_release,
+};
+
+static struct miscdevice jz4740_wdt_miscdev = {
+        .minor = WATCHDOG_MINOR,
+        .name = "watchdog",
+        .fops = &jz4740_wdt_fops,
+};
+
+static int __devinit jz4740_wdt_probe(struct platform_device *pdev)
+{
+        int ret = 0, size;
+        struct resource *res;
+        struct device *dev = &pdev->dev;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (res == NULL) {
+                dev_err(dev, "failed to get memory region resource\n");
+                return -ENXIO;
+        }
+
+        size = resource_size(res);
+        jz4740_wdt.mem = request_mem_region(res->start, size, pdev->name);
+        if (jz4740_wdt.mem == NULL) {
+                dev_err(dev, "failed to get memory region\n");
+                return -EBUSY;
+        }
+
+        jz4740_wdt.base = ioremap_nocache(res->start, size);
+        if (jz4740_wdt.base == NULL) {
+                dev_err(dev, "failed to map memory region\n");
+                ret = -EBUSY;
+                goto err_release_region;
+        }
+
+        jz4740_wdt.rtc_clk = clk_get(NULL, "rtc");
+        if (IS_ERR(jz4740_wdt.rtc_clk)) {
+                dev_err(dev, "cannot find RTC clock\n");
+                ret = PTR_ERR(jz4740_wdt.rtc_clk);
+                goto err_iounmap;
+        }
+
+        ret = misc_register(&jz4740_wdt_miscdev);
+        if (ret < 0) {
+                dev_err(dev, "cannot register misc device\n");
+                goto err_disable_clk;
+        }
+
+        return 0;
+
+err_disable_clk:
+        clk_put(jz4740_wdt.rtc_clk);
+err_iounmap:
+        iounmap(jz4740_wdt.base);
+err_release_region:
+        release_mem_region(jz4740_wdt.mem->start,
+                        resource_size(jz4740_wdt.mem));
+        return ret;
+}
+
+
+static int __devexit jz4740_wdt_remove(struct platform_device *pdev)
+{
+        jz4740_wdt_disable();
+        misc_deregister(&jz4740_wdt_miscdev);
+        clk_put(jz4740_wdt.rtc_clk);
+
+        iounmap(jz4740_wdt.base);
+        jz4740_wdt.base = NULL;
+
+        release_mem_region(jz4740_wdt.mem->start,
+                                resource_size(jz4740_wdt.mem));
+        jz4740_wdt.mem = NULL;
+
+        return 0;
+}
+
+
+static struct platform_driver jz4740_wdt_driver = {
+        .probe = jz4740_wdt_probe,
+        .remove = __devexit_p(jz4740_wdt_remove),
+        .driver = {
+                .name = "jz4740-wdt",
+                .owner  = THIS_MODULE,
+        },
+};
+
+
+static int __init jz4740_wdt_init(void)
+{
+        return platform_driver_register(&jz4740_wdt_driver);
+}
+module_init(jz4740_wdt_init);
+
+static void __exit jz4740_wdt_exit(void)
+{
+        platform_driver_unregister(&jz4740_wdt_driver);
+}
+module_exit(jz4740_wdt_exit);
+
+MODULE_AUTHOR("Paul Cercueil <paul@crapouillou.net>");
+MODULE_DESCRIPTION("jz4740 Watchdog Driver");
+
+module_param(heartbeat, int, 0);
+MODULE_PARM_DESC(heartbeat,
+                "Watchdog heartbeat period in seconds from 1 to "
+                __MODULE_STRING(MAX_HEARTBEAT) ", default "
+                __MODULE_STRING(DEFAULT_HEARTBEAT));
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+MODULE_ALIAS("platform:jz4740-wdt");