[WATCHDOG] MIPS RM9000 on-chip watchdog device
This is a driver for the on-chip watchdog device found on some MIPS RM9000 processors. Signed-off-by: Thomas Koeller <thomas.koeller@baslerweb.com> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Thomas Koeller
Wim Van Sebroeck
parent
e033351d53
commit
825d3748c1
3 changed files with 442 additions and 0 deletions
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@ -575,6 +575,16 @@ config INDYDOG
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timer expired and no process has written to /dev/watchdog during
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that time.
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config WDT_RM9K_GPI
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tristate "RM9000/GPI hardware watchdog"
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depends on WATCHDOG && CPU_RM9000
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help
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Watchdog implementation using the GPI hardware found on
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PMC-Sierra RM9xxx CPUs.
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To compile this driver as a module, choose M here: the
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module will be called rm9k_wdt.
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# S390 Architecture
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config ZVM_WATCHDOG
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@ -73,6 +73,7 @@ obj-$(CONFIG_WATCHDOG_RTAS) += wdrtas.o
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# MIPS Architecture
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obj-$(CONFIG_INDYDOG) += indydog.o
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obj-$(CONFIG_WDT_RM9K_GPI) += rm9k_wdt.o
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# S390 Architecture
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431
drivers/char/watchdog/rm9k_wdt.c
Normal file
431
drivers/char/watchdog/rm9k_wdt.c
Normal file
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@ -0,0 +1,431 @@
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/*
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* Watchdog implementation for GPI h/w found on PMC-Sierra RM9xxx
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* chips.
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*
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* Copyright (C) 2004 by Basler Vision Technologies AG
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* Author: Thomas Koeller <thomas.koeller@baslerweb.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/interrupt.h>
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#include <linux/fs.h>
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#include <linux/reboot.h>
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#include <linux/miscdevice.h>
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#include <linux/watchdog.h>
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#include <asm/io.h>
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#include <asm/atomic.h>
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#include <asm/processor.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <asm/rm9k-ocd.h>
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#include <rm9k_wdt.h>
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#define CLOCK 125000000
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#define MAX_TIMEOUT_SECONDS 32
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#define CPCCR 0x0080
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#define CPGIG1SR 0x0044
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#define CPGIG1ER 0x0054
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/* Function prototypes */
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static int __init wdt_gpi_probe(struct device *);
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static int __exit wdt_gpi_remove(struct device *);
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static void wdt_gpi_set_timeout(unsigned int);
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static int wdt_gpi_open(struct inode *, struct file *);
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static int wdt_gpi_release(struct inode *, struct file *);
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static ssize_t wdt_gpi_write(struct file *, const char __user *, size_t, loff_t *);
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static long wdt_gpi_ioctl(struct file *, unsigned int, unsigned long);
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static const struct resource *wdt_gpi_get_resource(struct platform_device *, const char *, unsigned int);
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static int wdt_gpi_notify(struct notifier_block *, unsigned long, void *);
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static irqreturn_t wdt_gpi_irqhdl(int, void *, struct pt_regs *);
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static const char wdt_gpi_name[] = "wdt_gpi";
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static atomic_t opencnt;
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static int expect_close;
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static int locked = 0;
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/* These are set from device resources */
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static void __iomem * wd_regs;
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static unsigned int wd_irq, wd_ctr;
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/* Module arguments */
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static int timeout = MAX_TIMEOUT_SECONDS;
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module_param(timeout, int, 0444);
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static unsigned long resetaddr = 0xbffdc200;
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module_param(resetaddr, ulong, 0444);
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static unsigned long flagaddr = 0xbffdc104;
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module_param(flagaddr, ulong, 0444);
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static int powercycle = 0;
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module_param(powercycle, bool, 0444);
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static int nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, bool, 0444);
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static struct file_operations fops = {
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.owner = THIS_MODULE,
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.open = wdt_gpi_open,
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.release = wdt_gpi_release,
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.write = wdt_gpi_write,
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.unlocked_ioctl = wdt_gpi_ioctl,
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};
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static struct miscdevice miscdev = {
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.minor = WATCHDOG_MINOR,
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.name = wdt_gpi_name,
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.fops = &fops,
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};
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static struct device_driver wdt_gpi_driver = {
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.name = (char *) wdt_gpi_name,
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.bus = &platform_bus_type,
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.owner = THIS_MODULE,
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.probe = wdt_gpi_probe,
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.remove = __exit_p(wdt_gpi_remove),
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.shutdown = NULL,
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.suspend = NULL,
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.resume = NULL,
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};
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static struct notifier_block wdt_gpi_shutdown = {
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.notifier_call = wdt_gpi_notify,
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};
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static const struct resource *
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wdt_gpi_get_resource(struct platform_device *pdv, const char *name,
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unsigned int type)
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{
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char buf[80];
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if (snprintf(buf, sizeof buf, "%s_0", name) >= sizeof buf)
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return NULL;
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return platform_get_resource_byname(pdv, type, buf);
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}
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/* No hotplugging on the platform bus - use __init */
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static int __init wdt_gpi_probe(struct device *dev)
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{
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int res;
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struct platform_device * const pdv = to_platform_device(dev);
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const struct resource
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* const rr = wdt_gpi_get_resource(pdv, WDT_RESOURCE_REGS,
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IORESOURCE_MEM),
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* const ri = wdt_gpi_get_resource(pdv, WDT_RESOURCE_IRQ,
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IORESOURCE_IRQ),
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* const rc = wdt_gpi_get_resource(pdv, WDT_RESOURCE_COUNTER,
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0);
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if (unlikely(!rr || !ri || !rc))
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return -ENXIO;
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wd_regs = ioremap_nocache(rr->start, rr->end + 1 - rr->start);
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if (unlikely(!wd_regs))
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return -ENOMEM;
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wd_irq = ri->start;
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wd_ctr = rc->start;
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res = misc_register(&miscdev);
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if (res)
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iounmap(wd_regs);
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else
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register_reboot_notifier(&wdt_gpi_shutdown);
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return res;
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}
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static int __exit wdt_gpi_remove(struct device *dev)
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{
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int res;
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unregister_reboot_notifier(&wdt_gpi_shutdown);
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res = misc_deregister(&miscdev);
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iounmap(wd_regs);
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wd_regs = NULL;
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return res;
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}
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static void wdt_gpi_set_timeout(unsigned int to)
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{
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u32 reg;
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const u32 wdval = (to * CLOCK) & ~0x0000000f;
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lock_titan_regs();
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reg = titan_readl(CPCCR) & ~(0xf << (wd_ctr * 4));
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titan_writel(reg, CPCCR);
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wmb();
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__raw_writel(wdval, wd_regs + 0x0000);
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wmb();
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titan_writel(reg | (0x2 << (wd_ctr * 4)), CPCCR);
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wmb();
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titan_writel(reg | (0x5 << (wd_ctr * 4)), CPCCR);
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iob();
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unlock_titan_regs();
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}
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static int wdt_gpi_open(struct inode *i, struct file *f)
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{
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int res;
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u32 reg;
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if (unlikely(0 > atomic_dec_if_positive(&opencnt)))
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return -EBUSY;
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expect_close = 0;
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if (locked) {
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module_put(THIS_MODULE);
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free_irq(wd_irq, &miscdev);
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locked = 0;
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}
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res = request_irq(wd_irq, wdt_gpi_irqhdl, SA_SHIRQ | SA_INTERRUPT,
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wdt_gpi_name, &miscdev);
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if (unlikely(res))
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return res;
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wdt_gpi_set_timeout(timeout);
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lock_titan_regs();
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reg = titan_readl(CPGIG1ER);
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titan_writel(reg | (0x100 << wd_ctr), CPGIG1ER);
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iob();
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unlock_titan_regs();
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printk(KERN_INFO "%s: watchdog started, timeout = %u seconds\n",
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wdt_gpi_name, timeout);
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return 0;
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}
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static int wdt_gpi_release(struct inode *i, struct file *f)
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{
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if (nowayout) {
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printk(KERN_NOTICE "%s: no way out - watchdog left running\n",
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wdt_gpi_name);
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__module_get(THIS_MODULE);
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locked = 1;
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} else {
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if (expect_close) {
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u32 reg;
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lock_titan_regs();
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reg = titan_readl(CPCCR) & ~(0xf << (wd_ctr * 4));
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titan_writel(reg, CPCCR);
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reg = titan_readl(CPGIG1ER);
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titan_writel(reg & ~(0x100 << wd_ctr), CPGIG1ER);
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iob();
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unlock_titan_regs();
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free_irq(wd_irq, &miscdev);
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printk(KERN_INFO "%s: watchdog stopped\n", wdt_gpi_name);
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} else {
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printk(KERN_NOTICE "%s: unexpected close() -"
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" watchdog left running\n",
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wdt_gpi_name);
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wdt_gpi_set_timeout(timeout);
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__module_get(THIS_MODULE);
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locked = 1;
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}
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}
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atomic_inc(&opencnt);
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return 0;
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}
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static ssize_t
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wdt_gpi_write(struct file *f, const char __user *d, size_t s, loff_t *o)
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{
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char val;
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wdt_gpi_set_timeout(timeout);
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expect_close = (s > 0) && !get_user(val, d) && (val == 'V');
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return s ? 1 : 0;
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}
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static long
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wdt_gpi_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
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{
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long res = -ENOTTY;
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const long size = _IOC_SIZE(cmd);
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int stat;
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static struct watchdog_info wdinfo = {
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.identity = "RM9xxx/GPI watchdog",
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.firmware_version = 0,
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING
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};
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if (unlikely(_IOC_TYPE(cmd) != WATCHDOG_IOCTL_BASE))
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return -ENOTTY;
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if ((_IOC_DIR(cmd) & _IOC_READ)
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&& !access_ok(VERIFY_WRITE, arg, size))
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return -EFAULT;
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if ((_IOC_DIR(cmd) & _IOC_WRITE)
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&& !access_ok(VERIFY_READ, arg, size))
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return -EFAULT;
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expect_close = 0;
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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wdinfo.options = nowayout ?
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WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING :
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WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE;
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res = __copy_to_user((void __user *)arg, &wdinfo, size) ?
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-EFAULT : size;
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break;
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case WDIOC_GETSTATUS:
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break;
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case WDIOC_GETBOOTSTATUS:
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stat = (*(volatile char *) flagaddr & 0x01)
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? WDIOF_CARDRESET : 0;
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res = __copy_to_user((void __user *)arg, &stat, size) ?
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-EFAULT : size;
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break;
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case WDIOC_SETOPTIONS:
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break;
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case WDIOC_KEEPALIVE:
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wdt_gpi_set_timeout(timeout);
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res = size;
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break;
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case WDIOC_SETTIMEOUT:
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{
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int val;
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if (unlikely(__copy_from_user(&val, (const void __user *) arg,
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size))) {
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res = -EFAULT;
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break;
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}
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if (val > 32)
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val = 32;
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timeout = val;
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wdt_gpi_set_timeout(val);
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res = size;
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printk("%s: timeout set to %u seconds\n",
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wdt_gpi_name, timeout);
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}
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break;
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case WDIOC_GETTIMEOUT:
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res = __copy_to_user((void __user *) arg, &timeout, size) ?
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-EFAULT : size;
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break;
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}
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return res;
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}
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static irqreturn_t wdt_gpi_irqhdl(int irq, void *ctxt, struct pt_regs *regs)
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{
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if (!unlikely(__raw_readl(wd_regs + 0x0008) & 0x1))
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return IRQ_NONE;
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__raw_writel(0x1, wd_regs + 0x0008);
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printk(KERN_WARNING "%s: watchdog expired - resetting system\n",
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wdt_gpi_name);
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*(volatile char *) flagaddr |= 0x01;
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*(volatile char *) resetaddr = powercycle ? 0x01 : 0x2;
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iob();
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while (1)
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cpu_relax();
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}
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static int
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wdt_gpi_notify(struct notifier_block *this, unsigned long code, void *unused)
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{
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if(code == SYS_DOWN || code == SYS_HALT) {
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u32 reg;
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lock_titan_regs();
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reg = titan_readl(CPCCR) & ~(0xf << (wd_ctr * 4));
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titan_writel(reg, CPCCR);
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reg = titan_readl(CPGIG1ER);
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titan_writel(reg & ~(0x100 << wd_ctr), CPGIG1ER);
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iob();
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unlock_titan_regs();
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}
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return NOTIFY_DONE;
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}
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static int __init wdt_gpi_init_module(void)
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{
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atomic_set(&opencnt, 1);
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if (timeout > MAX_TIMEOUT_SECONDS)
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timeout = MAX_TIMEOUT_SECONDS;
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return driver_register(&wdt_gpi_driver);
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}
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static void __exit wdt_gpi_cleanup_module(void)
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{
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driver_unregister(&wdt_gpi_driver);
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}
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module_init(wdt_gpi_init_module);
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module_exit(wdt_gpi_cleanup_module);
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MODULE_AUTHOR("Thomas Koeller <thomas.koeller@baslerweb.com>");
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MODULE_DESCRIPTION("Basler eXcite watchdog driver for gpi devices");
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MODULE_VERSION("0.1");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
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MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds");
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MODULE_PARM_DESC(resetaddr, "Address to write to to force a reset");
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MODULE_PARM_DESC(flagaddr, "Address to write to boot flags to");
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be disabled once started");
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MODULE_PARM_DESC(powercycle, "Cycle power if watchdog expires");
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