mirror of https://github.com/hak5/openwrt-owl.git
411 lines
10 KiB
Diff
411 lines
10 KiB
Diff
--- /dev/null
|
|
+++ b/drivers/watchdog/gemini_wdt.c
|
|
@@ -0,0 +1,378 @@
|
|
+/*
|
|
+ * Watchdog driver for Cortina Systems Gemini SoC
|
|
+ *
|
|
+ * Copyright (C) 2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
|
|
+ *
|
|
+ * 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/kernel.h>
|
|
+#include <linux/init.h>
|
|
+#include <linux/module.h>
|
|
+#include <linux/io.h>
|
|
+#include <linux/fs.h>
|
|
+#include <linux/uaccess.h>
|
|
+#include <linux/miscdevice.h>
|
|
+#include <linux/platform_device.h>
|
|
+#include <linux/watchdog.h>
|
|
+#include <linux/slab.h>
|
|
+
|
|
+#define GEMINI_WDCOUNTER 0x0
|
|
+#define GEMINI_WDLOAD 0x4
|
|
+#define GEMINI_WDRESTART 0x8
|
|
+
|
|
+#define WDRESTART_MAGIC 0x5AB9
|
|
+
|
|
+#define GEMINI_WDCR 0xC
|
|
+
|
|
+#define WDCR_CLOCK_5MHZ (1 << 4)
|
|
+#define WDCR_SYS_RST (1 << 1)
|
|
+#define WDCR_ENABLE (1 << 0)
|
|
+
|
|
+#define WDT_CLOCK 5000000 /* 5 MHz */
|
|
+#define WDT_DEFAULT_TIMEOUT 13
|
|
+#define WDT_MAX_TIMEOUT (0xFFFFFFFF / WDT_CLOCK)
|
|
+
|
|
+/* status bits */
|
|
+#define WDT_ACTIVE 0
|
|
+#define WDT_OK_TO_CLOSE 1
|
|
+
|
|
+static unsigned int timeout = WDT_DEFAULT_TIMEOUT;
|
|
+static int nowayout = WATCHDOG_NOWAYOUT;
|
|
+
|
|
+static DEFINE_SPINLOCK(gemini_wdt_lock);
|
|
+
|
|
+static struct platform_device *gemini_wdt_dev;
|
|
+
|
|
+struct gemini_wdt_struct {
|
|
+ struct resource *res;
|
|
+ struct device *dev;
|
|
+ void __iomem *base;
|
|
+ unsigned long status;
|
|
+};
|
|
+
|
|
+static struct watchdog_info gemini_wdt_info = {
|
|
+ .identity = "Gemini watchdog",
|
|
+ .options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING |
|
|
+ WDIOF_SETTIMEOUT,
|
|
+};
|
|
+
|
|
+/* Disable the watchdog. */
|
|
+static void gemini_wdt_stop(struct gemini_wdt_struct *gemini_wdt)
|
|
+{
|
|
+ spin_lock(&gemini_wdt_lock);
|
|
+
|
|
+ __raw_writel(0, gemini_wdt->base + GEMINI_WDCR);
|
|
+
|
|
+ clear_bit(WDT_ACTIVE, &gemini_wdt->status);
|
|
+
|
|
+ spin_unlock(&gemini_wdt_lock);
|
|
+}
|
|
+
|
|
+/* Service the watchdog */
|
|
+static void gemini_wdt_service(struct gemini_wdt_struct *gemini_wdt)
|
|
+{
|
|
+ __raw_writel(WDRESTART_MAGIC, gemini_wdt->base + GEMINI_WDRESTART);
|
|
+}
|
|
+
|
|
+/* Enable and reset the watchdog. */
|
|
+static void gemini_wdt_start(struct gemini_wdt_struct *gemini_wdt)
|
|
+{
|
|
+ spin_lock(&gemini_wdt_lock);
|
|
+
|
|
+ __raw_writel(timeout * WDT_CLOCK, gemini_wdt->base + GEMINI_WDLOAD);
|
|
+
|
|
+ gemini_wdt_service(gemini_wdt);
|
|
+
|
|
+ /* set clock before enabling */
|
|
+ __raw_writel(WDCR_CLOCK_5MHZ | WDCR_SYS_RST,
|
|
+ gemini_wdt->base + GEMINI_WDCR);
|
|
+
|
|
+ __raw_writel(WDCR_CLOCK_5MHZ | WDCR_SYS_RST | WDCR_ENABLE,
|
|
+ gemini_wdt->base + GEMINI_WDCR);
|
|
+
|
|
+ set_bit(WDT_ACTIVE, &gemini_wdt->status);
|
|
+
|
|
+ spin_unlock(&gemini_wdt_lock);
|
|
+}
|
|
+
|
|
+/* Watchdog device is opened, and watchdog starts running. */
|
|
+static int gemini_wdt_open(struct inode *inode, struct file *file)
|
|
+{
|
|
+ struct gemini_wdt_struct *gemini_wdt = platform_get_drvdata(gemini_wdt_dev);
|
|
+
|
|
+ if (test_bit(WDT_ACTIVE, &gemini_wdt->status))
|
|
+ return -EBUSY;
|
|
+
|
|
+ file->private_data = gemini_wdt;
|
|
+
|
|
+ gemini_wdt_start(gemini_wdt);
|
|
+
|
|
+ return nonseekable_open(inode, file);
|
|
+}
|
|
+
|
|
+/* Close the watchdog device. */
|
|
+static int gemini_wdt_close(struct inode *inode, struct file *file)
|
|
+{
|
|
+ struct gemini_wdt_struct *gemini_wdt = file->private_data;
|
|
+
|
|
+ /* Disable the watchdog if possible */
|
|
+ if (test_bit(WDT_OK_TO_CLOSE, &gemini_wdt->status))
|
|
+ gemini_wdt_stop(gemini_wdt);
|
|
+ else
|
|
+ dev_warn(gemini_wdt->dev, "Device closed unexpectedly - timer will not stop\n");
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+/* Handle commands from user-space. */
|
|
+static long gemini_wdt_ioctl(struct file *file, unsigned int cmd,
|
|
+ unsigned long arg)
|
|
+{
|
|
+ struct gemini_wdt_struct *gemini_wdt = file->private_data;
|
|
+
|
|
+ int value;
|
|
+
|
|
+ switch (cmd) {
|
|
+ case WDIOC_KEEPALIVE:
|
|
+ gemini_wdt_service(gemini_wdt);
|
|
+ return 0;
|
|
+
|
|
+ case WDIOC_GETSUPPORT:
|
|
+ return copy_to_user((struct watchdog_info *)arg, &gemini_wdt_info,
|
|
+ sizeof(gemini_wdt_info)) ? -EFAULT : 0;
|
|
+
|
|
+ case WDIOC_SETTIMEOUT:
|
|
+ if (get_user(value, (int *)arg))
|
|
+ return -EFAULT;
|
|
+
|
|
+ if ((value < 1) || (value > WDT_MAX_TIMEOUT))
|
|
+ return -EINVAL;
|
|
+
|
|
+ timeout = value;
|
|
+
|
|
+ /* restart wdt to use new timeout */
|
|
+ gemini_wdt_stop(gemini_wdt);
|
|
+ gemini_wdt_start(gemini_wdt);
|
|
+
|
|
+ /* Fall through */
|
|
+ case WDIOC_GETTIMEOUT:
|
|
+ return put_user(timeout, (int *)arg);
|
|
+
|
|
+ case WDIOC_GETTIMELEFT:
|
|
+ value = __raw_readl(gemini_wdt->base + GEMINI_WDCOUNTER);
|
|
+ return put_user(value / WDT_CLOCK, (int *)arg);
|
|
+
|
|
+ default:
|
|
+ return -ENOTTY;
|
|
+ }
|
|
+}
|
|
+
|
|
+/* Refresh the watchdog whenever device is written to. */
|
|
+static ssize_t gemini_wdt_write(struct file *file, const char *data,
|
|
+ size_t len, loff_t *ppos)
|
|
+{
|
|
+ struct gemini_wdt_struct *gemini_wdt = file->private_data;
|
|
+
|
|
+ if (len) {
|
|
+ if (!nowayout) {
|
|
+ size_t i;
|
|
+
|
|
+ clear_bit(WDT_OK_TO_CLOSE, &gemini_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,
|
|
+ &gemini_wdt->status);
|
|
+ }
|
|
+ }
|
|
+ gemini_wdt_service(gemini_wdt);
|
|
+ }
|
|
+
|
|
+ return len;
|
|
+}
|
|
+
|
|
+static const struct file_operations gemini_wdt_fops = {
|
|
+ .owner = THIS_MODULE,
|
|
+ .llseek = no_llseek,
|
|
+ .unlocked_ioctl = gemini_wdt_ioctl,
|
|
+ .open = gemini_wdt_open,
|
|
+ .release = gemini_wdt_close,
|
|
+ .write = gemini_wdt_write,
|
|
+};
|
|
+
|
|
+static struct miscdevice gemini_wdt_miscdev = {
|
|
+ .minor = WATCHDOG_MINOR,
|
|
+ .name = "watchdog",
|
|
+ .fops = &gemini_wdt_fops,
|
|
+};
|
|
+
|
|
+static void gemini_wdt_shutdown(struct platform_device *pdev)
|
|
+{
|
|
+ struct gemini_wdt_struct *gemini_wdt = platform_get_drvdata(pdev);
|
|
+
|
|
+ gemini_wdt_stop(gemini_wdt);
|
|
+}
|
|
+
|
|
+static int gemini_wdt_probe(struct platform_device *pdev)
|
|
+{
|
|
+ int ret;
|
|
+ int res_size;
|
|
+ struct resource *res;
|
|
+ void __iomem *base;
|
|
+ struct gemini_wdt_struct *gemini_wdt;
|
|
+ unsigned int reg;
|
|
+
|
|
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
+ if (!res) {
|
|
+ dev_err(&pdev->dev, "can't get device resources\n");
|
|
+ return -ENODEV;
|
|
+ }
|
|
+
|
|
+ res_size = resource_size(res);
|
|
+ if (!request_mem_region(res->start, res_size, res->name)) {
|
|
+ dev_err(&pdev->dev, "can't allocate %d bytes at %d address\n",
|
|
+ res_size, res->start);
|
|
+ return -ENOMEM;
|
|
+ }
|
|
+
|
|
+ base = ioremap(res->start, res_size);
|
|
+ if (!base) {
|
|
+ dev_err(&pdev->dev, "ioremap failed\n");
|
|
+ ret = -EIO;
|
|
+ goto fail0;
|
|
+ }
|
|
+
|
|
+ gemini_wdt = kzalloc(sizeof(struct gemini_wdt_struct), GFP_KERNEL);
|
|
+ if (!gemini_wdt) {
|
|
+ dev_err(&pdev->dev, "can't allocate interface\n");
|
|
+ ret = -ENOMEM;
|
|
+ goto fail1;
|
|
+ }
|
|
+
|
|
+ /* Setup gemini_wdt driver structure */
|
|
+ gemini_wdt->base = base;
|
|
+ gemini_wdt->res = res;
|
|
+
|
|
+ /* Set up platform driver data */
|
|
+ platform_set_drvdata(pdev, gemini_wdt);
|
|
+ gemini_wdt_dev = pdev;
|
|
+
|
|
+ if (gemini_wdt_miscdev.parent) {
|
|
+ ret = -EBUSY;
|
|
+ goto fail2;
|
|
+ }
|
|
+
|
|
+ gemini_wdt_miscdev.parent = &pdev->dev;
|
|
+
|
|
+ reg = __raw_readw(gemini_wdt->base + GEMINI_WDCR);
|
|
+ if (reg & WDCR_ENABLE) {
|
|
+ /* Watchdog was enabled by the bootloader, disable it. */
|
|
+ reg &= ~(WDCR_ENABLE);
|
|
+ __raw_writel(reg, gemini_wdt->base + GEMINI_WDCR);
|
|
+ }
|
|
+
|
|
+ ret = misc_register(&gemini_wdt_miscdev);
|
|
+ if (ret)
|
|
+ goto fail2;
|
|
+
|
|
+ return 0;
|
|
+
|
|
+fail2:
|
|
+ platform_set_drvdata(pdev, NULL);
|
|
+ kfree(gemini_wdt);
|
|
+fail1:
|
|
+ iounmap(base);
|
|
+fail0:
|
|
+ release_mem_region(res->start, res_size);
|
|
+
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static int gemini_wdt_remove(struct platform_device *pdev)
|
|
+{
|
|
+ struct gemini_wdt_struct *gemini_wdt = platform_get_drvdata(pdev);
|
|
+
|
|
+ platform_set_drvdata(pdev, NULL);
|
|
+ misc_deregister(&gemini_wdt_miscdev);
|
|
+ gemini_wdt_dev = NULL;
|
|
+ iounmap(gemini_wdt->base);
|
|
+ release_mem_region(gemini_wdt->res->start, resource_size(gemini_wdt->res));
|
|
+
|
|
+ kfree(gemini_wdt);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+#ifdef CONFIG_PM
|
|
+static int gemini_wdt_suspend(struct platform_device *pdev, pm_message_t message)
|
|
+{
|
|
+ struct gemini_wdt_struct *gemini_wdt = platform_get_drvdata(pdev);
|
|
+ unsigned int reg;
|
|
+
|
|
+ reg = __raw_readw(gemini_wdt->base + GEMINI_WDCR);
|
|
+ reg &= ~(WDCR_WDENABLE);
|
|
+ __raw_writel(reg, gemini_wdt->base + GEMINI_WDCR);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int gemini_wdt_resume(struct platform_device *pdev)
|
|
+{
|
|
+ struct gemini_wdt_struct *gemini_wdt = platform_get_drvdata(pdev);
|
|
+ unsigned int reg;
|
|
+
|
|
+ if (gemini_wdt->status) {
|
|
+ reg = __raw_readw(gemini_wdt->base + GEMINI_WDCR);
|
|
+ reg |= WDCR_WDENABLE;
|
|
+ __raw_writel(reg, gemini_wdt->base + GEMINI_WDCR);
|
|
+ }
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+#else
|
|
+#define gemini_wdt_suspend NULL
|
|
+#define gemini_wdt_resume NULL
|
|
+#endif
|
|
+
|
|
+static struct platform_driver gemini_wdt_driver = {
|
|
+ .probe = gemini_wdt_probe,
|
|
+ .remove = gemini_wdt_remove,
|
|
+ .shutdown = gemini_wdt_shutdown,
|
|
+ .suspend = gemini_wdt_suspend,
|
|
+ .resume = gemini_wdt_resume,
|
|
+ .driver = {
|
|
+ .name = "gemini-wdt",
|
|
+ .owner = THIS_MODULE,
|
|
+ },
|
|
+};
|
|
+
|
|
+static int __init gemini_wdt_init(void)
|
|
+{
|
|
+ return platform_driver_probe(&gemini_wdt_driver, gemini_wdt_probe);
|
|
+}
|
|
+
|
|
+static void __exit gemini_wdt_exit(void)
|
|
+{
|
|
+ platform_driver_unregister(&gemini_wdt_driver);
|
|
+}
|
|
+
|
|
+module_init(gemini_wdt_init);
|
|
+module_exit(gemini_wdt_exit);
|
|
+
|
|
+module_param(timeout, uint, 0);
|
|
+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds");
|
|
+
|
|
+module_param(nowayout, int, 0);
|
|
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started");
|
|
+
|
|
+MODULE_AUTHOR("Paulius Zaleckas");
|
|
+MODULE_DESCRIPTION("Watchdog driver for Gemini");
|
|
+MODULE_LICENSE("GPL");
|
|
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
|
|
+MODULE_ALIAS("platform:gemini-wdt");
|
|
--- a/drivers/watchdog/Kconfig
|
|
+++ b/drivers/watchdog/Kconfig
|
|
@@ -199,6 +199,16 @@ config 977_WATCHDOG
|
|
|
|
Not sure? It's safe to say N.
|
|
|
|
+config GEMINI_WATCHDOG
|
|
+ tristate "Gemini watchdog"
|
|
+ depends on ARCH_GEMINI
|
|
+ help
|
|
+ Say Y here if to include support for the watchdog timer
|
|
+ embedded in the Cortina Systems Gemini family of devices.
|
|
+
|
|
+ To compile this driver as a module, choose M here: the
|
|
+ module will be called gemini_wdt.
|
|
+
|
|
config IXP4XX_WATCHDOG
|
|
tristate "IXP4xx Watchdog"
|
|
depends on ARCH_IXP4XX
|
|
--- a/drivers/watchdog/Makefile
|
|
+++ b/drivers/watchdog/Makefile
|
|
@@ -37,6 +37,7 @@ obj-$(CONFIG_OMAP_WATCHDOG) += omap_wdt.
|
|
obj-$(CONFIG_TWL4030_WATCHDOG) += twl4030_wdt.o
|
|
obj-$(CONFIG_21285_WATCHDOG) += wdt285.o
|
|
obj-$(CONFIG_977_WATCHDOG) += wdt977.o
|
|
+obj-$(CONFIG_GEMINI_WATCHDOG) += gemini_wdt.o
|
|
obj-$(CONFIG_IXP4XX_WATCHDOG) += ixp4xx_wdt.o
|
|
obj-$(CONFIG_KS8695_WATCHDOG) += ks8695_wdt.o
|
|
obj-$(CONFIG_S3C2410_WATCHDOG) += s3c2410_wdt.o
|