diff options
Diffstat (limited to 'target/linux/coldfire/patches/031-Add-watchdog-driver-support-for-MCF5445x-and-MCF547x.patch')
| -rw-r--r-- | target/linux/coldfire/patches/031-Add-watchdog-driver-support-for-MCF5445x-and-MCF547x.patch | 338 |
1 files changed, 338 insertions, 0 deletions
diff --git a/target/linux/coldfire/patches/031-Add-watchdog-driver-support-for-MCF5445x-and-MCF547x.patch b/target/linux/coldfire/patches/031-Add-watchdog-driver-support-for-MCF5445x-and-MCF547x.patch new file mode 100644 index 000000000..5362aa333 --- /dev/null +++ b/target/linux/coldfire/patches/031-Add-watchdog-driver-support-for-MCF5445x-and-MCF547x.patch @@ -0,0 +1,338 @@ +From 42bf8a598049f6cb3c90b1f28a2f1b8daebe3de8 Mon Sep 17 00:00:00 2001 +From: Alison Wang <b18965@freescale.com> +Date: Thu, 4 Aug 2011 09:59:47 +0800 +Subject: [PATCH 31/52] Add watchdog driver support for MCF5445x and MCF547x/MCF548x + +Add watchdog driver support for MCF5445x and MCF547x/MCF548x. + +Signed-off-by: Alison Wang <b18965@freescale.com> +--- + drivers/watchdog/Kconfig | 9 ++ + drivers/watchdog/Makefile | 1 + + drivers/watchdog/mcf_wdt.c | 292 ++++++++++++++++++++++++++++++++++++++++++++ + 3 files changed, 302 insertions(+), 0 deletions(-) + create mode 100644 drivers/watchdog/mcf_wdt.c + +--- a/drivers/watchdog/Kconfig ++++ b/drivers/watchdog/Kconfig +@@ -974,6 +974,15 @@ config BCM63XX_WDT + + # PARISC Architecture + ++# ColdFire Architecture ++ ++config COLDFIRE_WATCHDOG ++ tristate "ColdFire watchdog support" ++ depends on M547X_8X || M5445X || M5441X ++ help ++ To compile this driver as a module, choose M here: the ++ module will be called softdog. ++ + # POWERPC Architecture + + config GEF_WDT +--- a/drivers/watchdog/Makefile ++++ b/drivers/watchdog/Makefile +@@ -107,6 +107,7 @@ obj-$(CONFIG_SBC_EPX_C3_WATCHDOG) += sbc + + # M68K Architecture + obj-$(CONFIG_M54xx_WATCHDOG) += m54xx_wdt.o ++obj-$(CONFIG_COLDFIRE_WATCHDOG) += mcf_wdt.o + + # MIPS Architecture + obj-$(CONFIG_ATH79_WDT) += ath79_wdt.o +--- /dev/null ++++ b/drivers/watchdog/mcf_wdt.c +@@ -0,0 +1,292 @@ ++/* ++ * drivers/watchdog/mcf_wdt.c ++ * ++ * Watchdog driver for ColdFire processors ++ * ++ * Copyright (C) 2006-2007, 2009-2011 Freescale Semiconductor, Inc. ++ * All Rights Reserved. ++ * ++ * Author: Shrek Wu<B16972@freesale.com> ++ * ChengJu Cai<B22600@freesale.com> ++ * ++ * This file is licensed under the terms of the GNU General Public ++ * License version 2. This program is licensed "as is" without any ++ * warranty of any kind, whether express or implied. ++ */ ++ ++#include <linux/module.h> ++#include <linux/moduleparam.h> ++#include <linux/types.h> ++#include <linux/kernel.h> ++#include <linux/fs.h> ++#include <linux/miscdevice.h> ++#include <linux/watchdog.h> ++#include <linux/init.h> ++#include <linux/bitops.h> ++ ++#include <linux/uaccess.h> ++#include <asm/coldfire.h> ++#include <asm/mcfsim.h> ++ ++static int nowayout; ++static unsigned int heartbeat = MCF_GPT_MAX_TIMEOUT; ++static unsigned long wdt_status; ++ ++#define WDT_IN_USE 0 ++#define WDT_OK_TO_CLOSE 1 ++ ++static unsigned long wdt_tick_rate; ++ ++#ifdef CONFIG_M547X_8X ++static int ++wdt_enable(int time) ++{ ++ if (time > 30 || time < 1) ++ return -EINVAL; ++ ++ heartbeat = time; ++ ++ MCF_GPT_GMS0 = 0; ++ MCF_GPT_GCIR0 = MCF_GPT_GCIR_PRE(heartbeat * wdt_tick_rate) | ++ MCF_GPT_GCIR_CNT(0xffff); ++ MCF_GPT_GMS0 = MCF_GPT_GMS_OCPW(0xA5) | MCF_GPT_GMS_WDEN | ++ MCF_GPT_GMS_CE | MCF_GPT_GMS_TMS_GPIO; ++ ++ return 0; ++} ++ ++static void ++wdt_disable(void) ++{ ++ MCF_GPT_GMS0 = 0; ++} ++ ++static void ++wdt_keepalive(void) ++{ ++ MCF_GPT_GMS0 = MCF_GPT_GMS_OCPW(0xA5) | MCF_GPT_GMS0; ++} ++ ++#elif defined(CONFIG_M5445X) || defined(CONFIG_M5441X) ++ ++/* Enable watchdog and set time-out */ ++static int ++wdt_enable(int time) ++{ ++ unsigned int sign = 0x01 << 31; ++ int i = 0, timeout_n = 31; ++ int max_timeout = sign / MCF_BUSCLK; ++ unsigned int count; ++ ++ if (time > max_timeout || time < 1) ++ return -EINVAL; ++ ++ count = time * MCF_BUSCLK; ++ ++ for (i = 0; i < 31; i++) { ++ if (count & (sign >> i)) { ++ if ((count & (~(sign >> i))) == 0) ++ timeout_n = 31 - i; ++ else ++ timeout_n = 31 - i + 1; ++ break; ++ } ++ } ++ ++ heartbeat = (unsigned int)(0x01 << timeout_n) / MCF_BUSCLK; ++ ++ MCF_SCM_CWCR = MCF_SCM_CWCR_CWE ++ | MCF_SCM_CWCR_CWRI(0x02) ++ | MCF_SCM_CWCR_CWT(timeout_n); ++ ++ return 0; ++} ++ ++/* Disable the watchdog */ ++static void ++wdt_disable(void) ++{ ++ MCF_SCM_CWCR = 0x00; ++} ++ ++/* Reset the watchdog timer counter */ ++static void ++wdt_keepalive(void) ++{ ++ MCF_SCM_CWSR = 0x55; ++ MCF_SCM_CWSR = 0xAA; ++} ++#endif ++ ++static int ++mcf_wdt_open(struct inode *inode, struct file *file) ++{ ++ int ret; ++ if (test_and_set_bit(WDT_IN_USE, &wdt_status)) ++ return -EBUSY; ++ ++ clear_bit(WDT_OK_TO_CLOSE, &wdt_status); ++ ++ ret = wdt_enable(heartbeat); ++ if (ret) ++ return ret; ++ ++ return nonseekable_open(inode, file); ++} ++ ++static ssize_t ++mcf_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos) ++{ ++ if (len) { ++ if (!nowayout) { ++ size_t i; ++ ++ clear_bit(WDT_OK_TO_CLOSE, &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, &wdt_status); ++ } ++ } ++ wdt_keepalive(); ++ } ++ ++ return len; ++} ++ ++ ++static struct watchdog_info ident = { ++ .options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT | ++ WDIOF_KEEPALIVEPING, ++ .identity = "Coldfire Watchdog", ++}; ++ ++static long ++mcf_wdt_ioctl(struct file *file, unsigned int cmd, unsigned long __user arg) ++{ ++ long ret = -ENOIOCTLCMD; ++ int time = 0; ++ ++ switch (cmd) { ++ case WDIOC_GETSUPPORT: ++ ret = copy_to_user((struct watchdog_info *)arg, &ident, ++ sizeof(ident)) ? -EFAULT : 0; ++ break; ++ ++ case WDIOC_GETSTATUS: ++ ret = put_user(0, (int *)arg); ++ break; ++ ++ case WDIOC_GETBOOTSTATUS: ++ ret = put_user(0, (int *)arg); ++ break; ++ ++ case WDIOC_SETTIMEOUT: ++ ret = get_user(time, (int *)arg); ++ if (ret) ++ break; ++ ++ ret = wdt_enable(time); ++ if (ret) ++ break; ++ ret = put_user(heartbeat, (int *)arg); ++ break; ++ ++ case WDIOC_GETTIMEOUT: ++ ret = put_user(heartbeat, (int *)arg); ++ break; ++ ++ case WDIOC_KEEPALIVE: ++ wdt_keepalive(); ++ ret = 0; ++ break; ++ } ++ ++ return ret; ++} ++ ++static int ++mcf_wdt_release(struct inode *inode, struct file *file) ++{ ++ if (test_bit(WDT_OK_TO_CLOSE, &wdt_status)) { ++#ifdef CONFIG_M547X_8X ++ MCF_GPT_GCIR0 = (0x0A << 16) | 0x09; ++ MCF_GPT_GMS0 = MCF_GPT_GMS_OCPW(0xA5) | MCF_GPT_GMS0; ++#else ++ wdt_keepalive(); ++#endif ++ } else { ++ printk(KERN_CRIT "WATCHDOG: Device closed unexpectdly\n"); ++ wdt_disable(); ++ } ++ ++ clear_bit(WDT_IN_USE, &wdt_status); ++ clear_bit(WDT_OK_TO_CLOSE, &wdt_status); ++ ++#ifdef CONFIG_M547X_8X ++ /*disable the XLB priority, otherwise the watchdog reset may fail*/ ++ MCF_XARB_PRIEN = 0; ++ /* Also disable the PCI, Ugly! But there is issue between PCI and ++ * watchdog. Otherwise the watchdog reset may fail, only valuable ++ * for testing! ++ */ ++ MCF_SPCR &= ~0x02; ++ asm("tpf"); ++#endif ++ ++ return 0; ++} ++ ++ ++static const struct file_operations mcf_wdt_fops = { ++ .owner = THIS_MODULE, ++ .llseek = no_llseek, ++ .write = mcf_wdt_write, ++ .unlocked_ioctl = mcf_wdt_ioctl, ++ .open = mcf_wdt_open, ++ .release = mcf_wdt_release, ++}; ++ ++static struct miscdevice mcf_wdt_miscdev = { ++ .minor = WATCHDOG_MINOR, ++ .name = "watchdog", ++ .fops = &mcf_wdt_fops, ++}; ++ ++static int __init mcf_wdt_init(void) ++{ ++ wdt_tick_rate = MCF_BUSCLK/0xffff; ++#ifdef CONFIG_WATCHDOG_NOWAYOUT ++ nowayout = 1; ++#else ++ nowayout = 0; ++#endif ++ printk(KERN_INFO "ColdFire watchdog driver is loaded.\n"); ++ ++ return misc_register(&mcf_wdt_miscdev); ++} ++ ++static void __exit mcf_wdt_exit(void) ++{ ++ misc_deregister(&mcf_wdt_miscdev); ++} ++ ++module_init(mcf_wdt_init); ++module_exit(mcf_wdt_exit); ++ ++MODULE_AUTHOR("Deepak Saxena"); ++MODULE_DESCRIPTION("ColdFire Watchdog"); ++ ++module_param(heartbeat, int, 0); ++MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds (default 60s)"); ++ ++module_param(nowayout, int, 0); ++MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started"); ++ ++MODULE_LICENSE("GPL"); ++MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); ++ |