diff options
Diffstat (limited to 'target/linux/gemini/patches-3.8/110-watchdog-add-gemini_wdt-driver.patch')
-rw-r--r-- | target/linux/gemini/patches-3.8/110-watchdog-add-gemini_wdt-driver.patch | 410 |
1 files changed, 410 insertions, 0 deletions
diff --git a/target/linux/gemini/patches-3.8/110-watchdog-add-gemini_wdt-driver.patch b/target/linux/gemini/patches-3.8/110-watchdog-add-gemini_wdt-driver.patch new file mode 100644 index 0000000000..a2b6cb705d --- /dev/null +++ b/target/linux/gemini/patches-3.8/110-watchdog-add-gemini_wdt-driver.patch @@ -0,0 +1,410 @@ +--- /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 +@@ -152,6 +152,16 @@ 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 +@@ -36,6 +36,7 @@ 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 |