From 642064ae9a94b47054ea7fb39804776ae11fbc4e Mon Sep 17 00:00:00 2001 From: kaloz Date: Wed, 21 Jul 2010 11:20:53 +0000 Subject: add support for the Gateworks Laguna family (Cavium Networks Econa CNS3xxx) git-svn-id: svn://svn.openwrt.org/openwrt/trunk@22323 3c298f89-4303-0410-b956-a3cf2f4a3e73 --- .../209-cns3xxx_watchdog_support.patch | 496 +++++++++++++++++++++ 1 file changed, 496 insertions(+) create mode 100644 target/linux/cns3xxx/patches-2.6.31/209-cns3xxx_watchdog_support.patch (limited to 'target/linux/cns3xxx/patches-2.6.31/209-cns3xxx_watchdog_support.patch') diff --git a/target/linux/cns3xxx/patches-2.6.31/209-cns3xxx_watchdog_support.patch b/target/linux/cns3xxx/patches-2.6.31/209-cns3xxx_watchdog_support.patch new file mode 100644 index 000000000..af9a60152 --- /dev/null +++ b/target/linux/cns3xxx/patches-2.6.31/209-cns3xxx_watchdog_support.patch @@ -0,0 +1,496 @@ +--- /dev/null ++++ b/drivers/watchdog/cns3xxx_wdt.c +@@ -0,0 +1,465 @@ ++/******************************************************************************* ++ * ++ * drivers/watchdog/cns3xxx_wdt.c ++ * ++ * Watchdog timer driver for the CNS3XXX SOCs ++ * ++ * Author: Scott Shu ++ * ++ * Copyright (c) 2008 Cavium Networks ++ * ++ * This file 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. ++ * ++ * This file is distributed in the hope that it will be useful, ++ * but AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty of ++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or ++ * NONINFRINGEMENT. See the GNU General Public License for more details. ++ * ++ * You should have received a copy of the GNU General Public License ++ * along with this file; if not, write to the Free Software ++ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA or ++ * visit http://www.gnu.org/licenses/. ++ * ++ * This file may also be available under a different license from Cavium. ++ * Contact Cavium Networks for more information ++ * ++ ******************************************************************************/ ++ ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++ ++#include ++ ++struct cns3xxx_wdt { ++ unsigned long timer_alive; ++ struct device *dev; ++ void __iomem *base; ++ int irq; ++ unsigned int perturb; ++ char expect_close; ++}; ++ ++static struct platform_device *cns3xxx_wdt_dev; ++extern unsigned int twd_timer_rate; ++static spinlock_t wdt_lock; ++ ++#define TIMER_MARGIN 60 ++static int cns3xxx_margin = TIMER_MARGIN; ++module_param(cns3xxx_margin, int, 0); ++MODULE_PARM_DESC(cns3xxx_margin, ++ "CNS3XXX timer margin in seconds. (0 < cns3xxx_margin < 65536, default=" ++ __MODULE_STRING(TIMER_MARGIN) ")"); ++ ++static int nowayout = WATCHDOG_NOWAYOUT; ++module_param(nowayout, int, 0); ++MODULE_PARM_DESC(nowayout, ++ "Watchdog cannot be stopped once started (default=" ++ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); ++ ++#define ONLY_TESTING 0 ++static int cns3xxx_noboot = ONLY_TESTING; ++module_param(cns3xxx_noboot, int, 0); ++MODULE_PARM_DESC(cns3xxx_noboot, "CNS3XXX watchdog action, " ++ "set to 1 to ignore reboots, 0 to reboot (default=" ++ __MODULE_STRING(ONLY_TESTING) ")"); ++ ++/* ++ * This is the interrupt handler. Note that we only use this ++ * in testing mode, so don't actually do a reboot here. ++ */ ++static irqreturn_t cns3xxx_wdt_fire(int irq, void *arg) ++{ ++ struct cns3xxx_wdt *wdt = arg; ++ ++ /* Check it really was our interrupt */ ++ if (readl(wdt->base + TWD_WDOG_INTSTAT)) { ++ dev_printk(KERN_CRIT, wdt->dev, ++ "Triggered - Reboot ignored.\n"); ++ /* Clear the interrupt on the watchdog */ ++ writel(1, wdt->base + TWD_WDOG_INTSTAT); ++ return IRQ_HANDLED; ++ } ++ return IRQ_NONE; ++} ++ ++/* ++ * cns3xxx_wdt_keepalive - reload the timer ++ * ++ * Note that the spec says a DIFFERENT value must be written to the reload ++ * register each time. The "perturb" variable deals with this by adding 1 ++ * to the count every other time the function is called. ++ */ ++static void cns3xxx_wdt_keepalive(struct cns3xxx_wdt *wdt) ++{ ++ unsigned int count; ++ ++ /* Assume prescale is set to 256 */ ++ count = (twd_timer_rate / 256) * cns3xxx_margin; ++ ++ /* Reload the counter */ ++ spin_lock(&wdt_lock); ++ writel(count + wdt->perturb, wdt->base + TWD_WDOG_LOAD); ++ wdt->perturb = wdt->perturb ? 0 : 1; ++ spin_unlock(&wdt_lock); ++} ++ ++static void cns3xxx_wdt_stop(struct cns3xxx_wdt *wdt) ++{ ++ spin_lock(&wdt_lock); ++ writel(0x12345678, wdt->base + TWD_WDOG_DISABLE); ++ writel(0x87654321, wdt->base + TWD_WDOG_DISABLE); ++ writel(0x0, wdt->base + TWD_WDOG_CONTROL); ++ spin_unlock(&wdt_lock); ++} ++ ++static void cns3xxx_wdt_start(struct cns3xxx_wdt *wdt) ++{ ++ dev_printk(KERN_INFO, wdt->dev, "enabling watchdog.\n"); ++ ++ //spin_lock(&wdt_lock); ++ /* This loads the count register but does NOT start the count yet */ ++ cns3xxx_wdt_keepalive(wdt); ++ spin_lock(&wdt_lock); ++ ++ if (cns3xxx_noboot) { ++ /* Enable watchdog - prescale=256, watchdog mode=0, enable=1 */ ++ writel(0x0000FF01, wdt->base + TWD_WDOG_CONTROL); ++ } else { ++ /* Enable watchdog - prescale=256, watchdog mode=1, enable=1 */ ++ writel(0x0000FF09, wdt->base + TWD_WDOG_CONTROL); ++ } ++ spin_unlock(&wdt_lock); ++} ++ ++static int cns3xxx_wdt_set_heartbeat(int t) ++{ ++ if (t < 0x0001 || t > 0xFFFF) ++ return -EINVAL; ++ ++ cns3xxx_margin = t; ++ return 0; ++} ++ ++/* ++ * /dev/watchdog handling ++ */ ++static int cns3xxx_wdt_open(struct inode *inode, struct file *file) ++{ ++ struct cns3xxx_wdt *wdt = platform_get_drvdata(cns3xxx_wdt_dev); ++ ++ if (test_and_set_bit(0, &wdt->timer_alive)) ++ return -EBUSY; ++ ++ if (nowayout) ++ __module_get(THIS_MODULE); ++ ++ file->private_data = wdt; ++ ++ /* ++ * Activate timer ++ */ ++ cns3xxx_wdt_start(wdt); ++ ++ return nonseekable_open(inode, file); ++} ++ ++static int cns3xxx_wdt_release(struct inode *inode, struct file *file) ++{ ++ struct cns3xxx_wdt *wdt = file->private_data; ++ ++ /* ++ * Shut off the timer. ++ * Lock it in if it's a module and we set nowayout ++ */ ++ if (wdt->expect_close == 42) ++ cns3xxx_wdt_stop(wdt); ++ else { ++ dev_printk(KERN_CRIT, wdt->dev, ++ "unexpected close, not stopping watchdog!\n"); ++ cns3xxx_wdt_keepalive(wdt); ++ } ++ clear_bit(0, &wdt->timer_alive); ++ wdt->expect_close = 0; ++ return 0; ++} ++ ++static ssize_t cns3xxx_wdt_write(struct file *file, const char *data, ++ size_t len, loff_t *ppos) ++{ ++ struct cns3xxx_wdt *wdt = file->private_data; ++ ++ /* ++ * Refresh the timer. ++ */ ++ if (len) { ++ if (!nowayout) { ++ size_t i; ++ ++ /* In case it was set long ago */ ++ wdt->expect_close = 0; ++ ++ for (i = 0; i != len; i++) { ++ char c; ++ ++ if (get_user(c, data + i)) ++ return -EFAULT; ++ if (c == 'V') ++ wdt->expect_close = 42; ++ } ++ } ++ cns3xxx_wdt_keepalive(wdt); ++ } ++ return len; ++} ++ ++static struct watchdog_info ident = { ++ .options = WDIOF_SETTIMEOUT | ++ WDIOF_KEEPALIVEPING | ++ WDIOF_MAGICCLOSE, ++ .identity = "CNS3XXX Watchdog", ++}; ++ ++static long cns3xxx_wdt_ioctl(struct file *file, unsigned int cmd, ++ unsigned long arg) ++{ ++ struct cns3xxx_wdt *wdt = file->private_data; ++ int ret; ++ union { ++ struct watchdog_info ident; ++ int i; ++ } uarg; ++ ++ if (_IOC_DIR(cmd) && _IOC_SIZE(cmd) > sizeof(uarg)) ++ return -ENOTTY; ++ ++ if (_IOC_DIR(cmd) & _IOC_WRITE) { ++ ret = copy_from_user(&uarg, (void __user *)arg, _IOC_SIZE(cmd)); ++ if (ret) ++ return -EFAULT; ++ } ++ ++ switch (cmd) { ++ case WDIOC_GETSUPPORT: ++ uarg.ident = ident; ++ ret = 0; ++ break; ++ ++ case WDIOC_GETSTATUS: ++ case WDIOC_GETBOOTSTATUS: ++ uarg.i = 0; ++ ret = 0; ++ break; ++ ++ case WDIOC_SETOPTIONS: ++ ret = -EINVAL; ++ if (uarg.i & WDIOS_DISABLECARD) { ++ cns3xxx_wdt_stop(wdt); ++ ret = 0; ++ } ++ if (uarg.i & WDIOS_ENABLECARD) { ++ cns3xxx_wdt_start(wdt); ++ ret = 0; ++ } ++ break; ++ ++ case WDIOC_KEEPALIVE: ++ cns3xxx_wdt_keepalive(wdt); ++ ret = 0; ++ break; ++ ++ case WDIOC_SETTIMEOUT: ++ ret = cns3xxx_wdt_set_heartbeat(uarg.i); ++ if (ret) ++ break; ++ ++ cns3xxx_wdt_keepalive(wdt); ++ /* Fall */ ++ case WDIOC_GETTIMEOUT: ++ uarg.i = cns3xxx_margin; ++ ret = 0; ++ break; ++ ++ default: ++ return -ENOTTY; ++ } ++ ++ if (ret == 0 && _IOC_DIR(cmd) & _IOC_READ) { ++ ret = copy_to_user((void __user *)arg, &uarg, _IOC_SIZE(cmd)); ++ if (ret) ++ ret = -EFAULT; ++ } ++ return ret; ++} ++ ++/* ++ * System shutdown handler. Turn off the watchdog if we're ++ * restarting or halting the system. ++ */ ++static void cns3xxx_wdt_shutdown(struct platform_device *dev) ++{ ++ struct cns3xxx_wdt *wdt = platform_get_drvdata(dev); ++ ++ if (system_state == SYSTEM_RESTART || system_state == SYSTEM_HALT) ++ cns3xxx_wdt_stop(wdt); ++} ++ ++/* ++ * Kernel Interfaces ++ */ ++static const struct file_operations cns3xxx_wdt_fops = { ++ .owner = THIS_MODULE, ++ .llseek = no_llseek, ++ .write = cns3xxx_wdt_write, ++ .unlocked_ioctl = cns3xxx_wdt_ioctl, ++ .open = cns3xxx_wdt_open, ++ .release = cns3xxx_wdt_release, ++}; ++ ++static struct miscdevice cns3xxx_wdt_miscdev = { ++ .minor = WATCHDOG_MINOR, ++ .name = "watchdog", ++ .fops = &cns3xxx_wdt_fops, ++}; ++ ++static int __devinit cns3xxx_wdt_probe(struct platform_device *dev) ++{ ++ struct cns3xxx_wdt *wdt; ++ struct resource *res; ++ int ret; ++ ++ /* We only accept one device, and it must have an id of -1 */ ++ if (dev->id != -1) ++ return -ENODEV; ++ ++ res = platform_get_resource(dev, IORESOURCE_MEM, 0); ++ if (!res) { ++ ret = -ENODEV; ++ goto err_out; ++ } ++ ++ wdt = kzalloc(sizeof(struct cns3xxx_wdt), GFP_KERNEL); ++ if (!wdt) { ++ ret = -ENOMEM; ++ goto err_out; ++ } ++ ++ wdt->dev = &dev->dev; ++ wdt->irq = platform_get_irq(dev, 0); ++ if (wdt->irq < 0) { ++ ret = -ENXIO; ++ goto err_free; ++ } ++ wdt->base = ioremap(res->start, res->end - res->start + 1); ++ if (!wdt->base) { ++ ret = -ENOMEM; ++ goto err_free; ++ } ++ ++ cns3xxx_wdt_miscdev.parent = &dev->dev; ++ ret = misc_register(&cns3xxx_wdt_miscdev); ++ if (ret) { ++ dev_printk(KERN_ERR, wdt->dev, ++ "cannot register miscdev on minor=%d (err=%d)\n", ++ WATCHDOG_MINOR, ret); ++ goto err_misc; ++ } ++ ++ ret = request_irq(wdt->irq, cns3xxx_wdt_fire, IRQF_DISABLED, ++ dev->name, wdt); ++ if (ret) { ++ dev_printk(KERN_ERR, wdt->dev, ++ "cannot register IRQ%d for watchdog\n", wdt->irq); ++ goto err_irq; ++ } ++ ++ cns3xxx_wdt_stop(wdt); ++ platform_set_drvdata(dev, wdt); ++ cns3xxx_wdt_dev = dev; ++ ++ return 0; ++ ++err_irq: ++ misc_deregister(&cns3xxx_wdt_miscdev); ++err_misc: ++ platform_set_drvdata(dev, NULL); ++ iounmap(wdt->base); ++err_free: ++ kfree(wdt); ++err_out: ++ return ret; ++} ++ ++static int __devexit cns3xxx_wdt_remove(struct platform_device *dev) ++{ ++ struct cns3xxx_wdt *wdt = platform_get_drvdata(dev); ++ ++ platform_set_drvdata(dev, NULL); ++ ++ misc_deregister(&cns3xxx_wdt_miscdev); ++ ++ cns3xxx_wdt_dev = NULL; ++ ++ free_irq(wdt->irq, wdt); ++ iounmap(wdt->base); ++ kfree(wdt); ++ return 0; ++} ++ ++ ++static struct platform_driver cns3xxx_wdt_driver = { ++ .probe = cns3xxx_wdt_probe, ++ .remove = __devexit_p(cns3xxx_wdt_remove), ++ .shutdown = cns3xxx_wdt_shutdown, ++ .driver = { ++ .owner = THIS_MODULE, ++ .name = "cns3xxx-wdt", ++ }, ++}; ++ ++static char banner[] __initdata = KERN_INFO ++ "CNS3XXX Watchdog Timer, noboot=%d margin=%d sec (nowayout= %d)\n"; ++ ++static int __init cns3xxx_wdt_init(void) ++{ ++ /* ++ * Check that the margin value is within it's range; ++ * if not reset to the default ++ */ ++ if (cns3xxx_wdt_set_heartbeat(cns3xxx_margin)) { ++ cns3xxx_wdt_set_heartbeat(TIMER_MARGIN); ++ printk(KERN_INFO "cns3xxx_margin value must be 0 < cns3xxx_margin < 65536, using %d\n", ++ TIMER_MARGIN); ++ } ++ ++ printk(banner, cns3xxx_noboot, cns3xxx_margin, nowayout); ++ ++ spin_lock_init(&wdt_lock); ++ ++ return platform_driver_register(&cns3xxx_wdt_driver); ++} ++ ++static void __exit cns3xxx_wdt_exit(void) ++{ ++ platform_driver_unregister(&cns3xxx_wdt_driver); ++} ++ ++module_init(cns3xxx_wdt_init); ++module_exit(cns3xxx_wdt_exit); ++ ++MODULE_AUTHOR("Scott Shu"); ++MODULE_DESCRIPTION("CNS3XXX Watchdog Device Driver"); ++MODULE_LICENSE("GPL"); ++MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); ++MODULE_ALIAS("platform:cns3xxx-wdt"); +--- a/drivers/watchdog/Kconfig ++++ b/drivers/watchdog/Kconfig +@@ -231,6 +231,15 @@ config DAVINCI_WATCHDOG + NOTE: once enabled, this timer cannot be disabled. + Say N if you are unsure. + ++config CNS3XXX_WATCHDOG ++ tristate "CNS3XXX watchdog" ++ depends on ARCH_CNS3XXX && LOCAL_TIMERS ++ help ++ Watchdog timer embedded into the CNS3XXX SoCs system. ++ ++ To compile this driver as a module, choose M here: the ++ module will be called cns3xxx_wdt. ++ + config ORION_WATCHDOG + tristate "Orion watchdog" + depends on ARCH_ORION5X || ARCH_KIRKWOOD +--- a/drivers/watchdog/Makefile ++++ b/drivers/watchdog/Makefile +@@ -41,6 +41,7 @@ obj-$(CONFIG_EP93XX_WATCHDOG) += ep93xx_ + obj-$(CONFIG_PNX4008_WATCHDOG) += pnx4008_wdt.o + obj-$(CONFIG_IOP_WATCHDOG) += iop_wdt.o + obj-$(CONFIG_DAVINCI_WATCHDOG) += davinci_wdt.o ++obj-$(CONFIG_CNS3XXX_WATCHDOG) += cns3xxx_wdt.o + obj-$(CONFIG_ORION_WATCHDOG) += orion_wdt.o + obj-$(CONFIG_COH901327_WATCHDOG) += coh901327_wdt.o + obj-$(CONFIG_STMP3XXX_WATCHDOG) += stmp3xxx_wdt.o -- cgit v1.2.3