diff options
Diffstat (limited to 'target/linux/cns21xx/patches-3.3/006-arm-add-fa-watchdog-driver.patch')
| -rw-r--r-- | target/linux/cns21xx/patches-3.3/006-arm-add-fa-watchdog-driver.patch | 458 |
1 files changed, 458 insertions, 0 deletions
diff --git a/target/linux/cns21xx/patches-3.3/006-arm-add-fa-watchdog-driver.patch b/target/linux/cns21xx/patches-3.3/006-arm-add-fa-watchdog-driver.patch new file mode 100644 index 000000000..34e374228 --- /dev/null +++ b/target/linux/cns21xx/patches-3.3/006-arm-add-fa-watchdog-driver.patch @@ -0,0 +1,458 @@ +--- 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 */ ++ |