mirror of https://github.com/hak5/openwrt-owl.git
459 lines
10 KiB
Diff
459 lines
10 KiB
Diff
--- a/drivers/watchdog/Kconfig
|
|
+++ b/drivers/watchdog/Kconfig
|
|
@@ -343,6 +343,13 @@ config IMX2_WDT
|
|
To compile this driver as a module, choose M here: the
|
|
module will be called imx2_wdt.
|
|
|
|
+config FA_WATCHDOG
|
|
+ tristate "Faraday watchdog"
|
|
+ depends on ARCH_GEMINI
|
|
+ help
|
|
+ Say Y here if you want support for the built-in watchdog timer
|
|
+ found in some Faraday FA526 based SoCs.
|
|
+
|
|
# AVR32 Architecture
|
|
|
|
config AT32AP700X_WDT
|
|
--- a/drivers/watchdog/Makefile
|
|
+++ b/drivers/watchdog/Makefile
|
|
@@ -53,6 +53,7 @@ obj-$(CONFIG_STMP3XXX_WATCHDOG) += stmp3
|
|
obj-$(CONFIG_NUC900_WATCHDOG) += nuc900_wdt.o
|
|
obj-$(CONFIG_TS72XX_WATCHDOG) += ts72xx_wdt.o
|
|
obj-$(CONFIG_IMX2_WDT) += imx2_wdt.o
|
|
+obj-$(CONFIG_FA_WATCHDOG) += fa_wdt.o
|
|
|
|
# AVR32 Architecture
|
|
obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
|
|
--- /dev/null
|
|
+++ b/drivers/watchdog/fa_wdt.c
|
|
@@ -0,0 +1,413 @@
|
|
+/*
|
|
+ * Watchdog driver for SoCs based on the Faraday FA526 core
|
|
+ *
|
|
+ * Copyright (C) 2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
|
|
+ * Copyright (C) 2010-2012 Gabor Juhos <juhosg@openwrt.org>
|
|
+ *
|
|
+ * 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/module.h>
|
|
+#include <linux/init.h>
|
|
+#include <linux/io.h>
|
|
+#include <linux/fs.h>
|
|
+#include <linux/notifier.h>
|
|
+#include <linux/reboot.h>
|
|
+#include <linux/uaccess.h>
|
|
+#include <linux/miscdevice.h>
|
|
+#include <linux/platform_device.h>
|
|
+#include <linux/watchdog.h>
|
|
+#include <linux/slab.h>
|
|
+#include <linux/fa_wdt.h>
|
|
+
|
|
+#define FA_WDCOUNTER 0x0
|
|
+#define FA_WDLOAD 0x4
|
|
+#define FA_WDRESTART 0x8
|
|
+
|
|
+#define WDRESTART_MAGIC 0x5AB9
|
|
+
|
|
+#define FA_WDCR 0xC
|
|
+
|
|
+#define WDCR_CLOCK_5MHZ (1 << 4)
|
|
+#define WDCR_SYS_RST (1 << 1)
|
|
+#define WDCR_ENABLE (1 << 0)
|
|
+
|
|
+#define WDT_DEFAULT_TIMEOUT 13
|
|
+
|
|
+/* 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(fa_wdt_lock);
|
|
+
|
|
+static struct platform_device *fa_wdt_dev;
|
|
+
|
|
+struct fa_wdt_struct {
|
|
+ struct resource *res;
|
|
+ struct device *dev;
|
|
+ void __iomem *base;
|
|
+ unsigned long status;
|
|
+ unsigned int clock;
|
|
+ unsigned int max_timeout;
|
|
+};
|
|
+
|
|
+static const struct watchdog_info fa_wdt_info = {
|
|
+ .identity = "Faraday watchdog",
|
|
+ .options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING |
|
|
+ WDIOF_SETTIMEOUT,
|
|
+};
|
|
+
|
|
+/* Disable the watchdog. */
|
|
+static void fa_wdt_stop(struct fa_wdt_struct *fa_wdt)
|
|
+{
|
|
+ spin_lock(&fa_wdt_lock);
|
|
+
|
|
+ __raw_writel(0, fa_wdt->base + FA_WDCR);
|
|
+
|
|
+ clear_bit(WDT_ACTIVE, &fa_wdt->status);
|
|
+
|
|
+ spin_unlock(&fa_wdt_lock);
|
|
+}
|
|
+
|
|
+/* Service the watchdog */
|
|
+static void fa_wdt_service(struct fa_wdt_struct *fa_wdt)
|
|
+{
|
|
+ __raw_writel(WDRESTART_MAGIC, fa_wdt->base + FA_WDRESTART);
|
|
+}
|
|
+
|
|
+/* Enable and reset the watchdog. */
|
|
+static void fa_wdt_start(struct fa_wdt_struct *fa_wdt)
|
|
+{
|
|
+ spin_lock(&fa_wdt_lock);
|
|
+
|
|
+ __raw_writel(timeout * fa_wdt->clock,
|
|
+ fa_wdt->base + FA_WDLOAD);
|
|
+
|
|
+ fa_wdt_service(fa_wdt);
|
|
+
|
|
+ /* set clock before enabling */
|
|
+ __raw_writel(WDCR_CLOCK_5MHZ | WDCR_SYS_RST,
|
|
+ fa_wdt->base + FA_WDCR);
|
|
+
|
|
+ __raw_writel(WDCR_CLOCK_5MHZ | WDCR_SYS_RST | WDCR_ENABLE,
|
|
+ fa_wdt->base + FA_WDCR);
|
|
+
|
|
+ set_bit(WDT_ACTIVE, &fa_wdt->status);
|
|
+
|
|
+ spin_unlock(&fa_wdt_lock);
|
|
+}
|
|
+
|
|
+/* Watchdog device is opened, and watchdog starts running. */
|
|
+static int fa_wdt_open(struct inode *inode, struct file *file)
|
|
+{
|
|
+ struct fa_wdt_struct *fa_wdt = platform_get_drvdata(fa_wdt_dev);
|
|
+
|
|
+ if (test_bit(WDT_ACTIVE, &fa_wdt->status))
|
|
+ return -EBUSY;
|
|
+
|
|
+ file->private_data = fa_wdt;
|
|
+
|
|
+ fa_wdt_start(fa_wdt);
|
|
+
|
|
+ return nonseekable_open(inode, file);
|
|
+}
|
|
+
|
|
+/* Close the watchdog device. */
|
|
+static int fa_wdt_close(struct inode *inode, struct file *file)
|
|
+{
|
|
+ struct fa_wdt_struct *fa_wdt = file->private_data;
|
|
+
|
|
+ /* Disable the watchdog if possible */
|
|
+ if (test_bit(WDT_OK_TO_CLOSE, &fa_wdt->status))
|
|
+ fa_wdt_stop(fa_wdt);
|
|
+ else
|
|
+ dev_warn(fa_wdt->dev, "Device closed unexpectedly - timer will not stop\n");
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+/* Handle commands from user-space. */
|
|
+static long fa_wdt_ioctl(struct file *file, unsigned int cmd,
|
|
+ unsigned long arg)
|
|
+{
|
|
+ struct fa_wdt_struct *fa_wdt = file->private_data;
|
|
+
|
|
+ int value;
|
|
+
|
|
+ switch (cmd) {
|
|
+ case WDIOC_KEEPALIVE:
|
|
+ fa_wdt_service(fa_wdt);
|
|
+ return 0;
|
|
+
|
|
+ case WDIOC_GETSUPPORT:
|
|
+ return copy_to_user((struct watchdog_info *)arg, &fa_wdt_info,
|
|
+ sizeof(fa_wdt_info)) ? -EFAULT : 0;
|
|
+
|
|
+ case WDIOC_SETTIMEOUT:
|
|
+ if (get_user(value, (int *)arg))
|
|
+ return -EFAULT;
|
|
+
|
|
+ if ((value < 1) || (value > fa_wdt->max_timeout))
|
|
+ return -EINVAL;
|
|
+
|
|
+ timeout = value;
|
|
+
|
|
+ /* restart wdt to use new timeout */
|
|
+ fa_wdt_stop(fa_wdt);
|
|
+ fa_wdt_start(fa_wdt);
|
|
+
|
|
+ /* Fall through */
|
|
+ case WDIOC_GETTIMEOUT:
|
|
+ return put_user(timeout, (int *)arg);
|
|
+
|
|
+ case WDIOC_GETTIMELEFT:
|
|
+ value = __raw_readl(fa_wdt->base + FA_WDCOUNTER);
|
|
+ return put_user(value / fa_wdt->clock, (int *)arg);
|
|
+
|
|
+ default:
|
|
+ return -ENOTTY;
|
|
+ }
|
|
+}
|
|
+
|
|
+/* Refresh the watchdog whenever device is written to. */
|
|
+static ssize_t fa_wdt_write(struct file *file, const char *data,
|
|
+ size_t len, loff_t *ppos)
|
|
+{
|
|
+ struct fa_wdt_struct *fa_wdt = file->private_data;
|
|
+
|
|
+ if (len) {
|
|
+ if (!nowayout) {
|
|
+ size_t i;
|
|
+
|
|
+ clear_bit(WDT_OK_TO_CLOSE, &fa_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,
|
|
+ &fa_wdt->status);
|
|
+ }
|
|
+ }
|
|
+ fa_wdt_service(fa_wdt);
|
|
+ }
|
|
+
|
|
+ return len;
|
|
+}
|
|
+
|
|
+static int fa_wdt_notify_sys(struct notifier_block *this,
|
|
+ unsigned long code, void *unused)
|
|
+{
|
|
+ struct fa_wdt_struct *fa_wdt = platform_get_drvdata(fa_wdt_dev);
|
|
+
|
|
+ if (code == SYS_DOWN || code == SYS_HALT)
|
|
+ fa_wdt_stop(fa_wdt);
|
|
+
|
|
+ return NOTIFY_DONE;
|
|
+}
|
|
+
|
|
+static struct notifier_block fa_wdt_notifier = {
|
|
+ .notifier_call = fa_wdt_notify_sys,
|
|
+};
|
|
+
|
|
+static const struct file_operations fa_wdt_fops = {
|
|
+ .owner = THIS_MODULE,
|
|
+ .llseek = no_llseek,
|
|
+ .unlocked_ioctl = fa_wdt_ioctl,
|
|
+ .open = fa_wdt_open,
|
|
+ .release = fa_wdt_close,
|
|
+ .write = fa_wdt_write,
|
|
+};
|
|
+
|
|
+static struct miscdevice fa_wdt_miscdev = {
|
|
+ .minor = WATCHDOG_MINOR,
|
|
+ .name = "watchdog",
|
|
+ .fops = &fa_wdt_fops,
|
|
+};
|
|
+
|
|
+static void fa_wdt_shutdown(struct platform_device *pdev)
|
|
+{
|
|
+ struct fa_wdt_struct *fa_wdt = platform_get_drvdata(pdev);
|
|
+
|
|
+ fa_wdt_stop(fa_wdt);
|
|
+}
|
|
+
|
|
+static int __devinit fa_wdt_probe(struct platform_device *pdev)
|
|
+{
|
|
+ int ret;
|
|
+ int res_size;
|
|
+ struct resource *res;
|
|
+ void __iomem *base;
|
|
+ struct fa_wdt_struct *fa_wdt;
|
|
+ struct fa_wdt_platform_data *pdata;
|
|
+
|
|
+ pdata = pdev->dev.platform_data;
|
|
+ if (!pdata) {
|
|
+ dev_err(&pdev->dev, "no platform data specified\n");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+
|
|
+ if (!pdata->clock) {
|
|
+ dev_err(&pdev->dev, "invalid clock value\n");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+
|
|
+ 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;
|
|
+ }
|
|
+
|
|
+ fa_wdt = kzalloc(sizeof(struct fa_wdt_struct), GFP_KERNEL);
|
|
+ if (!fa_wdt) {
|
|
+ dev_err(&pdev->dev, "can't allocate interface\n");
|
|
+ ret = -ENOMEM;
|
|
+ goto fail1;
|
|
+ }
|
|
+
|
|
+ /* Setup fa_wdt driver structure */
|
|
+ fa_wdt->base = base;
|
|
+ fa_wdt->res = res;
|
|
+ fa_wdt->dev = &pdev->dev;
|
|
+ fa_wdt->clock = pdata->clock;
|
|
+ fa_wdt->max_timeout = 0xffffffffU / pdata->clock;
|
|
+
|
|
+ /* Set up platform driver data */
|
|
+ platform_set_drvdata(pdev, fa_wdt);
|
|
+ fa_wdt_dev = pdev;
|
|
+
|
|
+ if (fa_wdt_miscdev.parent) {
|
|
+ ret = -EBUSY;
|
|
+ goto fail2;
|
|
+ }
|
|
+
|
|
+ ret = register_reboot_notifier(&fa_wdt_notifier);
|
|
+ if (ret)
|
|
+ goto fail2;
|
|
+
|
|
+ fa_wdt_miscdev.parent = &pdev->dev;
|
|
+
|
|
+ ret = misc_register(&fa_wdt_miscdev);
|
|
+ if (ret)
|
|
+ goto fail3;
|
|
+
|
|
+ return 0;
|
|
+
|
|
+fail3:
|
|
+ unregister_reboot_notifier(&fa_wdt_notifier);
|
|
+fail2:
|
|
+ platform_set_drvdata(pdev, NULL);
|
|
+ kfree(fa_wdt);
|
|
+fail1:
|
|
+ iounmap(base);
|
|
+fail0:
|
|
+ release_mem_region(res->start, res_size);
|
|
+
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static int __devexit fa_wdt_remove(struct platform_device *pdev)
|
|
+{
|
|
+ struct fa_wdt_struct *fa_wdt = platform_get_drvdata(pdev);
|
|
+
|
|
+ platform_set_drvdata(pdev, NULL);
|
|
+ misc_deregister(&fa_wdt_miscdev);
|
|
+ unregister_reboot_notifier(&fa_wdt_notifier);
|
|
+ fa_wdt_dev = NULL;
|
|
+ iounmap(fa_wdt->base);
|
|
+ release_mem_region(fa_wdt->res->start, resource_size(fa_wdt->res));
|
|
+
|
|
+ kfree(fa_wdt);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+#ifdef CONFIG_PM
|
|
+static int fa_wdt_suspend(struct platform_device *pdev, pm_message_t message)
|
|
+{
|
|
+ struct fa_wdt_struct *fa_wdt = platform_get_drvdata(pdev);
|
|
+ unsigned int reg;
|
|
+
|
|
+ reg = __raw_readw(fa_wdt->base + FA_WDCR);
|
|
+ reg &= ~(WDCR_WDENABLE);
|
|
+ __raw_writel(reg, fa_wdt->base + FA_WDCR);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int fa_wdt_resume(struct platform_device *pdev)
|
|
+{
|
|
+ struct fa_wdt_struct *fa_wdt = platform_get_drvdata(pdev);
|
|
+ unsigned int reg;
|
|
+
|
|
+ if (fa_wdt->status) {
|
|
+ reg = __raw_readw(fa_wdt->base + FA_WDCR);
|
|
+ reg |= WDCR_WDENABLE;
|
|
+ __raw_writel(reg, fa_wdt->base + FA_WDCR);
|
|
+ }
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+#else
|
|
+#define fa_wdt_suspend NULL
|
|
+#define fa_wdt_resume NULL
|
|
+#endif
|
|
+
|
|
+static struct platform_driver fa_wdt_driver = {
|
|
+ .probe = fa_wdt_probe,
|
|
+ .remove = __devexit_p(fa_wdt_remove),
|
|
+ .shutdown = fa_wdt_shutdown,
|
|
+ .suspend = fa_wdt_suspend,
|
|
+ .resume = fa_wdt_resume,
|
|
+ .driver = {
|
|
+ .name = "fa-wdt",
|
|
+ .owner = THIS_MODULE,
|
|
+ },
|
|
+};
|
|
+
|
|
+static int __init fa_wdt_init(void)
|
|
+{
|
|
+ return platform_driver_probe(&fa_wdt_driver, fa_wdt_probe);
|
|
+}
|
|
+
|
|
+static void __exit fa_wdt_exit(void)
|
|
+{
|
|
+ platform_driver_unregister(&fa_wdt_driver);
|
|
+}
|
|
+
|
|
+module_init(fa_wdt_init);
|
|
+module_exit(fa_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_AUTHOR("Gabor Juhos");
|
|
+MODULE_DESCRIPTION("Watchdog driver for Faraday FA526 based SoCs");
|
|
+MODULE_LICENSE("GPL v2");
|
|
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
|
|
+MODULE_ALIAS("platform:fa-wdt");
|
|
--- /dev/null
|
|
+++ b/include/linux/fa_wdt.h
|
|
@@ -0,0 +1,13 @@
|
|
+/*
|
|
+ * Platform data definition for the Faraday watchdog driver
|
|
+ */
|
|
+
|
|
+#ifndef _FA_WDT_H
|
|
+#define _FA_WDT_H
|
|
+
|
|
+struct fa_wdt_platform_data {
|
|
+ unsigned int clock;
|
|
+};
|
|
+
|
|
+#endif /* _FA_WDT_H */
|
|
+
|