--- /dev/null
+--- /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
+@@ -198,6 +198,16 @@ 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
projects / openwrt / staging / yousong.git / blobdiff