[WATCHDOG] pnx4008: add watchdog support
Vitaly Wool [Mon, 26 Jun 2006 15:31:49 +0000 (19:31 +0400)]
Add watchdog support for Philips PNX4008 ARM board inlined.

Signed-off-by: Vitaly Wool <vitalywool@gmail.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

arch/arm/mach-pnx4008/clock.c
drivers/char/watchdog/Kconfig
drivers/char/watchdog/Makefile
drivers/char/watchdog/pnx4008_wdt.c [new file with mode: 0644]
include/asm-arm/arch-pnx4008/clock.h

index f582ed2..daa8d3d 100644 (file)
@@ -735,6 +735,16 @@ static struct clk uart6_ck = {
        .enable_reg = UARTCLKCTRL_REG,
 };
 
+static struct clk wdt_ck = {
+       .name = "wdt_ck",
+       .parent = &per_ck,
+       .flags = NEEDS_INITIALIZATION,
+       .round_rate = &on_off_round_rate,
+       .set_rate = &on_off_set_rate,
+       .enable_shift = 0,
+       .enable_reg = TIMCLKCTRL_REG,
+};
+
 /* These clocks are visible outside this module
  * and can be initialized
  */
@@ -765,6 +775,7 @@ static struct clk *onchip_clks[] = {
        &uart4_ck,
        &uart5_ck,
        &uart6_ck,
+       &wdt_ck,
 };
 
 static int local_clk_enable(struct clk *clk)
index 77ab7e0..06f3fa2 100644 (file)
@@ -172,6 +172,17 @@ config OMAP_WATCHDOG
          Support for TI OMAP1610/OMAP1710/OMAP2420 watchdog.  Say 'Y' here to
          enable the OMAP1610/OMAP1710 watchdog timer.
 
+config PNX4008_WATCHDOG
+       tristate "PNX4008 Watchdog"
+       depends on WATCHDOG && ARCH_PNX4008
+       help
+         Say Y here if to include support for the watchdog timer
+         in the PNX4008 processor.
+         This driver can be built as a module by choosing M. The module
+         will be called pnx4008_wdt.
+
+         Say N if you are unsure.
+
 # X86 (i386 + ia64 + x86_64) Architecture
 
 config ACQUIRE_WDT
index 5099f8b..6ffca7c 100644 (file)
@@ -33,6 +33,7 @@ obj-$(CONFIG_S3C2410_WATCHDOG) += s3c2410_wdt.o
 obj-$(CONFIG_SA1100_WATCHDOG) += sa1100_wdt.o
 obj-$(CONFIG_MPCORE_WATCHDOG) += mpcore_wdt.o
 obj-$(CONFIG_EP93XX_WATCHDOG) += ep93xx_wdt.o
+obj-$(CONFIG_PNX4008_WATCHDOG) += pnx4008_wdt.o
 
 # X86 (i386 + ia64 + x86_64) Architecture
 obj-$(CONFIG_ACQUIRE_WDT) += acquirewdt.o
diff --git a/drivers/char/watchdog/pnx4008_wdt.c b/drivers/char/watchdog/pnx4008_wdt.c
new file mode 100644 (file)
index 0000000..7ae2d08
--- /dev/null
@@ -0,0 +1,353 @@
+/*
+ * drivers/char/watchdog/pnx4008_wdt.c
+ *
+ * Watchdog driver for PNX4008 board
+ *
+ * Authors: Dmitry Chigirev <source@mvista.com>,
+ *         Vitaly Wool <vitalywool@gmail.com>
+ * Based on sa1100 driver,
+ * Copyright (C) 2000 Oleg Drokin <green@crimea.edu>
+ *
+ * 2005-2006 (c) MontaVista Software, Inc. 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/config.h>
+#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/ioport.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+
+#include <asm/hardware.h>
+#include <asm/uaccess.h>
+#include <asm/io.h>
+
+#define MODULE_NAME "PNX4008-WDT: "
+
+/* WatchDog Timer - Chapter 23 Page 207 */
+
+#define DEFAULT_HEARTBEAT 19
+#define MAX_HEARTBEAT     60
+
+/* Watchdog timer register set definition */
+#define WDTIM_INT(p)     ((p) + 0x0)
+#define WDTIM_CTRL(p)    ((p) + 0x4)
+#define WDTIM_COUNTER(p) ((p) + 0x8)
+#define WDTIM_MCTRL(p)   ((p) + 0xC)
+#define WDTIM_MATCH0(p)  ((p) + 0x10)
+#define WDTIM_EMR(p)     ((p) + 0x14)
+#define WDTIM_PULSE(p)   ((p) + 0x18)
+#define WDTIM_RES(p)     ((p) + 0x1C)
+
+/* WDTIM_INT bit definitions */
+#define MATCH_INT      1
+
+/* WDTIM_CTRL bit definitions */
+#define COUNT_ENAB     1
+#define RESET_COUNT    (1<<1)
+#define DEBUG_EN       (1<<2)
+
+/* WDTIM_MCTRL bit definitions */
+#define MR0_INT        1
+#undef  RESET_COUNT0
+#define RESET_COUNT0   (1<<2)
+#define STOP_COUNT0    (1<<2)
+#define M_RES1         (1<<3)
+#define M_RES2         (1<<4)
+#define RESFRC1        (1<<5)
+#define RESFRC2        (1<<6)
+
+/* WDTIM_EMR bit definitions */
+#define EXT_MATCH0      1
+#define MATCH_OUTPUT_HIGH (2<<4)       /*a MATCH_CTRL setting */
+
+/* WDTIM_RES bit definitions */
+#define WDOG_RESET      1      /* read only */
+
+#define WDOG_COUNTER_RATE 13000000     /*the counter clock is 13 MHz fixed */
+
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+static int nowayout = 1;
+#else
+static int nowayout = 0;
+#endif
+static int heartbeat = DEFAULT_HEARTBEAT;
+
+static unsigned long wdt_status;
+#define WDT_IN_USE        0
+#define WDT_OK_TO_CLOSE   1
+#define WDT_REGION_INITED 2
+#define WDT_DEVICE_INITED 3
+
+static unsigned long boot_status;
+
+static struct resource *wdt_mem;
+static void __iomem    *wdt_base;
+struct clk             *wdt_clk;
+
+static void wdt_enable(void)
+{
+       if (wdt_clk)
+               clk_set_rate(wdt_clk, 1);
+
+       /* stop counter, initiate counter reset */
+       __raw_writel(RESET_COUNT, WDTIM_CTRL(wdt_base));
+       /*wait for reset to complete. 100% guarantee event */
+       while (__raw_readl(WDTIM_COUNTER(wdt_base)));
+       /* internal and external reset, stop after that */
+       __raw_writel(M_RES2 | STOP_COUNT0 | RESET_COUNT0,
+               WDTIM_MCTRL(wdt_base));
+       /* configure match output */
+       __raw_writel(MATCH_OUTPUT_HIGH, WDTIM_EMR(wdt_base));
+       /* clear interrupt, just in case */
+       __raw_writel(MATCH_INT, WDTIM_INT(wdt_base));
+       /* the longest pulse period 65541/(13*10^6) seconds ~ 5 ms. */
+       __raw_writel(0xFFFF, WDTIM_PULSE(wdt_base));
+       __raw_writel(heartbeat * WDOG_COUNTER_RATE, WDTIM_MATCH0(wdt_base));
+       /*enable counter, stop when debugger active */
+       __raw_writel(COUNT_ENAB | DEBUG_EN, WDTIM_CTRL(wdt_base));
+}
+
+static void wdt_disable(void)
+{
+       __raw_writel(0, WDTIM_CTRL(wdt_base));  /*stop counter */
+       if (wdt_clk)
+               clk_set_rate(wdt_clk, 0);
+}
+
+static int pnx4008_wdt_open(struct inode *inode, struct file *file)
+{
+       if (test_and_set_bit(WDT_IN_USE, &wdt_status))
+               return -EBUSY;
+
+       clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
+
+       wdt_enable();
+
+       return nonseekable_open(inode, file);
+}
+
+static ssize_t
+pnx4008_wdt_write(struct file *file, const char *data, size_t len,
+                 loff_t * ppos)
+{
+       /*  Can't seek (pwrite) on this device  */
+       if (ppos != &file->f_pos)
+               return -ESPIPE;
+
+       if (len) {
+               if (!nowayout) {
+                       size_t i;
+
+                       clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
+
+                       for (i = 0; i != len; i++) {
+                               char c;
+
+                               if (get_user(c, data + i))
+                                       return -EFAULT;
+                               if (c == 'V')
+                                       set_bit(WDT_OK_TO_CLOSE, &wdt_status);
+                       }
+               }
+               wdt_enable();
+       }
+
+       return len;
+}
+
+static struct watchdog_info ident = {
+       .options = WDIOF_CARDRESET | WDIOF_MAGICCLOSE |
+           WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
+       .identity = "PNX4008 Watchdog",
+};
+
+static int
+pnx4008_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
+                 unsigned long arg)
+{
+       int ret = -ENOIOCTLCMD;
+       int time;
+
+       switch (cmd) {
+       case WDIOC_GETSUPPORT:
+               ret = copy_to_user((struct watchdog_info *)arg, &ident,
+                                  sizeof(ident)) ? -EFAULT : 0;
+               break;
+
+       case WDIOC_GETSTATUS:
+               ret = put_user(0, (int *)arg);
+               break;
+
+       case WDIOC_GETBOOTSTATUS:
+               ret = put_user(boot_status, (int *)arg);
+               break;
+
+       case WDIOC_SETTIMEOUT:
+               ret = get_user(time, (int *)arg);
+               if (ret)
+                       break;
+
+               if (time <= 0 || time > MAX_HEARTBEAT) {
+                       ret = -EINVAL;
+                       break;
+               }
+
+               heartbeat = time;
+               wdt_enable();
+               /* Fall through */
+
+       case WDIOC_GETTIMEOUT:
+               ret = put_user(heartbeat, (int *)arg);
+               break;
+
+       case WDIOC_KEEPALIVE:
+               wdt_enable();
+               ret = 0;
+               break;
+       }
+       return ret;
+}
+
+static int pnx4008_wdt_release(struct inode *inode, struct file *file)
+{
+       if (!test_bit(WDT_OK_TO_CLOSE, &wdt_status))
+               printk(KERN_WARNING "WATCHDOG: Device closed unexpectdly\n");
+
+       wdt_disable();
+       clear_bit(WDT_IN_USE, &wdt_status);
+       clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
+
+       return 0;
+}
+
+static struct file_operations pnx4008_wdt_fops = {
+       .owner = THIS_MODULE,
+       .llseek = no_llseek,
+       .write = pnx4008_wdt_write,
+       .ioctl = pnx4008_wdt_ioctl,
+       .open = pnx4008_wdt_open,
+       .release = pnx4008_wdt_release,
+};
+
+static struct miscdevice pnx4008_wdt_miscdev = {
+       .minor = WATCHDOG_MINOR,
+       .name = "watchdog",
+       .fops = &pnx4008_wdt_fops,
+};
+
+static int pnx4008_wdt_probe(struct platform_device *pdev)
+{
+       int ret = 0, size;
+       struct resource *res;
+
+       if (heartbeat < 1 || heartbeat > MAX_HEARTBEAT)
+               heartbeat = DEFAULT_HEARTBEAT;
+
+       printk(KERN_INFO MODULE_NAME
+               "PNX4008 Watchdog Timer: heartbeat %d sec\n", heartbeat);
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       if (res == NULL) {
+               printk(KERN_INFO MODULE_NAME
+                       "failed to get memory region resouce\n");
+               return -ENOENT;
+       }
+
+       size = res->end - res->start + 1;
+       wdt_mem = request_mem_region(res->start, size, pdev->name);
+
+       if (wdt_mem == NULL) {
+               printk(KERN_INFO MODULE_NAME "failed to get memory region\n");
+               return -ENOENT;
+       }
+       wdt_base = (void __iomem *)IO_ADDRESS(res->start);
+
+       wdt_clk = clk_get(&pdev->dev, "wdt_ck");
+       if (!wdt_clk) {
+               release_resource(wdt_mem);
+               kfree(wdt_mem);
+               goto out;
+       } else
+               clk_set_rate(wdt_clk, 1);
+
+       ret = misc_register(&pnx4008_wdt_miscdev);
+       if (ret < 0) {
+               printk(KERN_ERR MODULE_NAME "cannot register misc device\n");
+               release_resource(wdt_mem);
+               kfree(wdt_mem);
+               clk_set_rate(wdt_clk, 0);
+       } else {
+               boot_status = (__raw_readl(WDTIM_RES(wdt_base)) & WDOG_RESET) ?
+                   WDIOF_CARDRESET : 0;
+               wdt_disable();          /*disable for now */
+               set_bit(WDT_DEVICE_INITED, &wdt_status);
+       }
+
+out:
+       return ret;
+}
+
+static int pnx4008_wdt_remove(struct platform_device *pdev)
+{
+       if (wdt_mem) {
+               release_resource(wdt_mem);
+               kfree(wdt_mem);
+               wdt_mem = NULL;
+       }
+       if (wdt_clk) {
+               clk_set_rate(wdt_clk, 0);
+               clk_put(wdt_clk);
+               wdt_clk = NULL;
+       }
+       misc_deregister(&pnx4008_wdt_miscdev);
+       return 0;
+}
+
+static struct platform_driver platform_wdt_driver = {
+       .driver = {
+               .name = "watchdog",
+       },
+       .probe = pnx4008_wdt_probe,
+       .remove = pnx4008_wdt_remove,
+};
+
+static int __init pnx4008_wdt_init(void)
+{
+       return platform_driver_register(&platform_wdt_driver);
+}
+
+static void __exit pnx4008_wdt_exit(void)
+{
+       return platform_driver_unregister(&platform_wdt_driver);
+}
+
+module_init(pnx4008_wdt_init);
+module_exit(pnx4008_wdt_exit);
+
+MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>");
+MODULE_DESCRIPTION("PNX4008 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_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout,
+                "Set to 1 to keep watchdog running after device release");
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
index 91ae003..ce155e1 100644 (file)
@@ -32,6 +32,7 @@ struct clk;
 #define KEYCLKCTRL_REG         (PWRMAN_VA_BASE + 0xb0)
 #define TSCLKCTRL_REG          (PWRMAN_VA_BASE + 0xb4)
 #define PWMCLKCTRL_REG         (PWRMAN_VA_BASE + 0xb8)
+#define TIMCLKCTRL_REG         (PWRMAN_VA_BASE + 0xbc)
 #define SPICTRL_REG            (PWRMAN_VA_BASE + 0xc4)
 #define FLASHCLKCTRL_REG       (PWRMAN_VA_BASE + 0xc8)
 #define UART3CLK_REG           (PWRMAN_VA_BASE + 0xd0)