watchdog: Add MCF548x watchdog driver.
Add watchdog driver for MCF548x. Signed-off-by: Philippe De Muyter <phdm@macqel.be> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Philippe De Muyter
Wim Van Sebroeck
parent
f8394f61c6
commit
88cce42762
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@ -59,11 +59,13 @@
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#define MCF_GPT_GMS_GPIO_INPUT (0x00000000)
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#define MCF_GPT_GMS_GPIO_OUTLO (0x00000020)
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#define MCF_GPT_GMS_GPIO_OUTHI (0x00000030)
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#define MCF_GPT_GMS_GPIO_MASK (0x00000030)
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#define MCF_GPT_GMS_TMS_DISABLE (0x00000000)
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#define MCF_GPT_GMS_TMS_INCAPT (0x00000001)
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#define MCF_GPT_GMS_TMS_OUTCAPT (0x00000002)
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#define MCF_GPT_GMS_TMS_PWM (0x00000003)
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#define MCF_GPT_GMS_TMS_GPIO (0x00000004)
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#define MCF_GPT_GMS_TMS_MASK (0x00000007)
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/* Bit definitions and macros for MCF_GPT_GCIR */
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#define MCF_GPT_GCIR_CNT(x) (((x)&0x0000FFFF)<<0)
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@ -862,7 +862,12 @@ config SBC_EPX_C3_WATCHDOG
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# M68K Architecture
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# M68KNOMMU Architecture
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config M548x_WATCHDOG
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tristate "MCF548x watchdog support"
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depends on M548x
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help
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To compile this driver as a module, choose M here: the
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module will be called m548x_wdt.
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# MIPS Architecture
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@ -106,8 +106,7 @@ obj-$(CONFIG_SBC_EPX_C3_WATCHDOG) += sbc_epx_c3.o
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# M32R Architecture
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# M68K Architecture
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# M68KNOMMU Architecture
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obj-$(CONFIG_M548x_WATCHDOG) += m548x_wdt.o
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# MIPS Architecture
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obj-$(CONFIG_ATH79_WDT) += ath79_wdt.o
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@ -0,0 +1,227 @@
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/*
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* drivers/watchdog/m548x_wdt.c
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*
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* Watchdog driver for ColdFire MCF548x processors
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* Copyright 2010 (c) Philippe De Muyter <phdm@macqel.be>
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*
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* Adapted from the IXP4xx watchdog driver, which carries these notices:
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*
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* Author: Deepak Saxena <dsaxena@plexity.net>
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*
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* Copyright 2004 (c) MontaVista, Software, Inc.
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* Based on sa1100 driver, Copyright (C) 2000 Oleg Drokin <green@crimea.edu>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/miscdevice.h>
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#include <linux/watchdog.h>
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#include <linux/init.h>
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#include <linux/bitops.h>
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#include <linux/ioport.h>
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#include <linux/uaccess.h>
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#include <asm/coldfire.h>
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#include <asm/m548xsim.h>
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#include <asm/m548xgpt.h>
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static int nowayout = WATCHDOG_NOWAYOUT;
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static unsigned int heartbeat = 30; /* (secs) Default is 0.5 minute */
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static unsigned long wdt_status;
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#define WDT_IN_USE 0
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#define WDT_OK_TO_CLOSE 1
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static void wdt_enable(void)
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{
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unsigned int gms0;
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/* preserve GPIO usage, if any */
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gms0 = __raw_readl(MCF_MBAR + MCF_GPT_GMS0);
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if (gms0 & MCF_GPT_GMS_TMS_GPIO)
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gms0 &= (MCF_GPT_GMS_TMS_GPIO | MCF_GPT_GMS_GPIO_MASK
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| MCF_GPT_GMS_OD);
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else
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gms0 = MCF_GPT_GMS_TMS_GPIO | MCF_GPT_GMS_OD;
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__raw_writel(gms0, MCF_MBAR + MCF_GPT_GMS0);
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__raw_writel(MCF_GPT_GCIR_PRE(heartbeat*(MCF_BUSCLK/0xffff)) |
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MCF_GPT_GCIR_CNT(0xffff), MCF_MBAR + MCF_GPT_GCIR0);
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gms0 |= MCF_GPT_GMS_OCPW(0xA5) | MCF_GPT_GMS_WDEN | MCF_GPT_GMS_CE;
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__raw_writel(gms0, MCF_MBAR + MCF_GPT_GMS0);
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}
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static void wdt_disable(void)
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{
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unsigned int gms0;
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/* disable watchdog */
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gms0 = __raw_readl(MCF_MBAR + MCF_GPT_GMS0);
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gms0 &= ~(MCF_GPT_GMS_WDEN | MCF_GPT_GMS_CE);
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__raw_writel(gms0, MCF_MBAR + MCF_GPT_GMS0);
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}
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static void wdt_keepalive(void)
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{
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unsigned int gms0;
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gms0 = __raw_readl(MCF_MBAR + MCF_GPT_GMS0);
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gms0 |= MCF_GPT_GMS_OCPW(0xA5);
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__raw_writel(gms0, MCF_MBAR + MCF_GPT_GMS0);
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}
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static int m548x_wdt_open(struct inode *inode, struct file *file)
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{
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if (test_and_set_bit(WDT_IN_USE, &wdt_status))
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return -EBUSY;
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clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
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wdt_enable();
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return nonseekable_open(inode, file);
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}
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static ssize_t m548x_wdt_write(struct file *file, const char *data,
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size_t len, loff_t *ppos)
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{
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if (len) {
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if (!nowayout) {
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size_t i;
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clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
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for (i = 0; i != len; i++) {
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char c;
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if (get_user(c, data + i))
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return -EFAULT;
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if (c == 'V')
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set_bit(WDT_OK_TO_CLOSE, &wdt_status);
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}
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}
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wdt_keepalive();
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}
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return len;
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}
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static const struct watchdog_info ident = {
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.options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT |
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WDIOF_KEEPALIVEPING,
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.identity = "Coldfire M548x Watchdog",
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};
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static long m548x_wdt_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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int ret = -ENOTTY;
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int time;
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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ret = copy_to_user((struct watchdog_info *)arg, &ident,
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sizeof(ident)) ? -EFAULT : 0;
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break;
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case WDIOC_GETSTATUS:
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ret = put_user(0, (int *)arg);
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break;
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case WDIOC_GETBOOTSTATUS:
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ret = put_user(0, (int *)arg);
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break;
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case WDIOC_KEEPALIVE:
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wdt_keepalive();
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ret = 0;
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break;
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case WDIOC_SETTIMEOUT:
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ret = get_user(time, (int *)arg);
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if (ret)
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break;
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if (time <= 0 || time > 30) {
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ret = -EINVAL;
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break;
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}
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heartbeat = time;
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wdt_enable();
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/* Fall through */
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case WDIOC_GETTIMEOUT:
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ret = put_user(heartbeat, (int *)arg);
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break;
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}
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return ret;
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}
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static int m548x_wdt_release(struct inode *inode, struct file *file)
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{
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if (test_bit(WDT_OK_TO_CLOSE, &wdt_status))
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wdt_disable();
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else {
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printk(KERN_CRIT "WATCHDOG: Device closed unexpectedly - "
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"timer will not stop\n");
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wdt_keepalive();
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}
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clear_bit(WDT_IN_USE, &wdt_status);
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clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
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return 0;
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}
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static const struct file_operations m548x_wdt_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.write = m548x_wdt_write,
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.unlocked_ioctl = m548x_wdt_ioctl,
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.open = m548x_wdt_open,
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.release = m548x_wdt_release,
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};
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static struct miscdevice m548x_wdt_miscdev = {
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.minor = WATCHDOG_MINOR,
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.name = "watchdog",
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.fops = &m548x_wdt_fops,
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};
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static int __init m548x_wdt_init(void)
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{
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if (!request_mem_region(MCF_MBAR + MCF_GPT_GCIR0, 4,
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"Coldfire M548x Watchdog")) {
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printk(KERN_WARNING
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"Coldfire M548x Watchdog : I/O region busy\n");
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return -EBUSY;
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}
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printk(KERN_INFO "ColdFire watchdog driver is loaded.\n");
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return misc_register(&m548x_wdt_miscdev);
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}
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static void __exit m548x_wdt_exit(void)
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{
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misc_deregister(&m548x_wdt_miscdev);
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release_mem_region(MCF_MBAR + MCF_GPT_GCIR0, 4);
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}
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module_init(m548x_wdt_init);
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module_exit(m548x_wdt_exit);
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MODULE_AUTHOR("Philippe De Muyter <phdm@macqel.be>");
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MODULE_DESCRIPTION("Coldfire M548x Watchdog");
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module_param(heartbeat, int, 0);
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MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds (default 30s)");
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module_param(nowayout, int, 0);
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
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