2006-08-15 03:55:29 +08:00
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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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2006-11-18 06:50:06 +08:00
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#include <linux/notifier.h>
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2006-08-15 03:55:29 +08:00
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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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2006-12-06 08:45:39 +08:00
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static irqreturn_t wdt_gpi_irqhdl(int, void *);
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2006-11-18 06:50:06 +08:00
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static void wdt_gpi_start(void);
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static void wdt_gpi_stop(void);
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2006-08-15 03:55:29 +08:00
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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 int wdt_gpi_notify(struct notifier_block *, unsigned long, void *);
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2006-11-18 06:50:06 +08:00
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static const struct resource *wdt_gpi_get_resource(struct platform_device *, const char *, unsigned int);
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2006-11-18 06:15:48 +08:00
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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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2006-08-15 03:55:29 +08:00
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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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2006-11-18 06:50:06 +08:00
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static int locked;
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2006-08-15 03:55:29 +08:00
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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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2006-11-18 04:51:35 +08:00
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MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds");
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2006-08-15 03:55:29 +08:00
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static unsigned long resetaddr = 0xbffdc200;
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module_param(resetaddr, ulong, 0444);
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2006-11-18 04:51:35 +08:00
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MODULE_PARM_DESC(resetaddr, "Address to write to to force a reset");
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2006-08-15 03:55:29 +08:00
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static unsigned long flagaddr = 0xbffdc104;
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module_param(flagaddr, ulong, 0444);
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2006-11-18 04:51:35 +08:00
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MODULE_PARM_DESC(flagaddr, "Address to write to boot flags to");
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2006-11-18 06:50:06 +08:00
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static int powercycle;
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2006-08-15 03:55:29 +08:00
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module_param(powercycle, bool, 0444);
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2006-11-18 04:51:35 +08:00
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MODULE_PARM_DESC(powercycle, "Cycle power if watchdog expires");
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2006-08-15 03:55:29 +08:00
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static int nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, bool, 0444);
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2006-11-18 04:51:35 +08:00
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be disabled once started");
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2006-08-15 03:55:29 +08:00
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2006-12-06 08:45:26 +08:00
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/* Kernel interfaces */
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2007-02-12 16:55:32 +08:00
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static const struct file_operations fops = {
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2006-12-06 08:45:26 +08:00
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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 notifier_block wdt_gpi_shutdown = {
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.notifier_call = wdt_gpi_notify,
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};
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2006-11-18 06:15:48 +08:00
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/* Interrupt handler */
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2006-12-06 08:45:39 +08:00
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static irqreturn_t wdt_gpi_irqhdl(int irq, void *ctxt)
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2006-08-15 03:55:29 +08:00
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{
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2006-11-18 06:15:48 +08:00
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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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2006-08-15 03:55:29 +08:00
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2006-11-18 06:50:06 +08:00
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printk(KERN_CRIT "%s: watchdog expired - resetting system\n",
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2006-11-18 06:15:48 +08:00
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wdt_gpi_name);
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2006-08-15 03:55:29 +08:00
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2006-11-18 06:15:48 +08:00
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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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2006-08-15 03:55:29 +08:00
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}
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2006-11-18 06:15:48 +08:00
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/* Watchdog functions */
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2006-11-18 06:36:08 +08:00
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static void wdt_gpi_start(void)
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{
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u32 reg;
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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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}
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static void wdt_gpi_stop(void)
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{
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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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2006-08-15 03:55:29 +08:00
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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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2006-11-18 06:15:48 +08:00
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/* /dev/watchdog operations */
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2006-11-18 06:50:06 +08:00
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static int wdt_gpi_open(struct inode *inode, struct file *file)
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2006-08-15 03:55:29 +08:00
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{
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int res;
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2006-11-18 06:50:06 +08:00
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if (unlikely(atomic_dec_if_positive(&opencnt) < 0))
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2006-08-15 03:55:29 +08:00
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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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2007-02-14 16:33:16 +08:00
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res = request_irq(wd_irq, wdt_gpi_irqhdl, IRQF_SHARED | IRQF_DISABLED,
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2006-08-15 03:55:29 +08:00
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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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2006-11-18 06:36:08 +08:00
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wdt_gpi_start();
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2006-08-15 03:55:29 +08:00
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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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2006-11-18 06:50:06 +08:00
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return nonseekable_open(inode, file);
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2006-08-15 03:55:29 +08:00
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}
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2006-11-18 06:50:06 +08:00
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static int wdt_gpi_release(struct inode *inode, struct file *file)
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2006-08-15 03:55:29 +08:00
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{
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if (nowayout) {
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2006-11-18 06:50:06 +08:00
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printk(KERN_INFO "%s: no way out - watchdog left running\n",
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2006-08-15 03:55:29 +08:00
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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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2006-11-18 06:36:08 +08:00
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wdt_gpi_stop();
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2006-08-15 03:55:29 +08:00
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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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2006-11-18 06:50:06 +08:00
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printk(KERN_CRIT "%s: unexpected close() -"
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2006-08-15 03:55:29 +08:00
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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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2006-11-18 06:50:06 +08:00
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void __user *argp = (void __user *)arg;
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2006-08-15 03:55:29 +08:00
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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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2006-11-18 06:50:06 +08:00
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res = __copy_to_user(argp, &wdinfo, size) ? -EFAULT : size;
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2006-08-15 03:55:29 +08:00
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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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2006-11-18 06:50:06 +08:00
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res = __copy_to_user(argp, &stat, size) ?
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2006-08-15 03:55:29 +08:00
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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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2006-11-18 06:50:06 +08:00
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if (unlikely(__copy_from_user(&val, argp, size))) {
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2006-08-15 03:55:29 +08:00
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res = -EFAULT;
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break;
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}
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2006-11-18 06:50:06 +08:00
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if (val > MAX_TIMEOUT_SECONDS)
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val = MAX_TIMEOUT_SECONDS;
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2006-08-15 03:55:29 +08:00
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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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2006-11-18 06:50:06 +08:00
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printk(KERN_INFO "%s: timeout set to %u seconds\n",
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2006-08-15 03:55:29 +08:00
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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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2006-11-18 06:50:06 +08:00
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res = __copy_to_user(argp, &timeout, size) ?
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2006-08-15 03:55:29 +08:00
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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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2006-11-18 06:50:06 +08:00
|
|
|
/* Shutdown notifier */
|
2006-08-15 03:55:29 +08:00
|
|
|
static int
|
|
|
|
wdt_gpi_notify(struct notifier_block *this, unsigned long code, void *unused)
|
|
|
|
{
|
2006-11-18 06:36:08 +08:00
|
|
|
if (code == SYS_DOWN || code == SYS_HALT)
|
|
|
|
wdt_gpi_stop();
|
|
|
|
|
2006-08-15 03:55:29 +08:00
|
|
|
return NOTIFY_DONE;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2006-11-18 06:15:48 +08:00
|
|
|
/* Init & exit procedures */
|
|
|
|
static const struct resource *
|
|
|
|
wdt_gpi_get_resource(struct platform_device *pdv, const char *name,
|
|
|
|
unsigned int type)
|
|
|
|
{
|
|
|
|
char buf[80];
|
|
|
|
if (snprintf(buf, sizeof buf, "%s_0", name) >= sizeof buf)
|
|
|
|
return NULL;
|
|
|
|
return platform_get_resource_byname(pdv, type, buf);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* No hotplugging on the platform bus - use __init */
|
|
|
|
static int __init wdt_gpi_probe(struct device *dev)
|
|
|
|
{
|
|
|
|
int res;
|
|
|
|
struct platform_device * const pdv = to_platform_device(dev);
|
|
|
|
const struct resource
|
|
|
|
* const rr = wdt_gpi_get_resource(pdv, WDT_RESOURCE_REGS,
|
|
|
|
IORESOURCE_MEM),
|
|
|
|
* const ri = wdt_gpi_get_resource(pdv, WDT_RESOURCE_IRQ,
|
|
|
|
IORESOURCE_IRQ),
|
|
|
|
* const rc = wdt_gpi_get_resource(pdv, WDT_RESOURCE_COUNTER,
|
|
|
|
0);
|
|
|
|
|
|
|
|
if (unlikely(!rr || !ri || !rc))
|
|
|
|
return -ENXIO;
|
|
|
|
|
|
|
|
wd_regs = ioremap_nocache(rr->start, rr->end + 1 - rr->start);
|
|
|
|
if (unlikely(!wd_regs))
|
|
|
|
return -ENOMEM;
|
|
|
|
wd_irq = ri->start;
|
|
|
|
wd_ctr = rc->start;
|
|
|
|
res = misc_register(&miscdev);
|
|
|
|
if (res)
|
|
|
|
iounmap(wd_regs);
|
|
|
|
else
|
|
|
|
register_reboot_notifier(&wdt_gpi_shutdown);
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int __exit wdt_gpi_remove(struct device *dev)
|
|
|
|
{
|
|
|
|
int res;
|
|
|
|
|
|
|
|
unregister_reboot_notifier(&wdt_gpi_shutdown);
|
|
|
|
res = misc_deregister(&miscdev);
|
|
|
|
iounmap(wd_regs);
|
|
|
|
wd_regs = NULL;
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* Device driver init & exit */
|
|
|
|
static struct device_driver wdt_gpi_driver = {
|
|
|
|
.name = (char *) wdt_gpi_name,
|
|
|
|
.bus = &platform_bus_type,
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.probe = wdt_gpi_probe,
|
|
|
|
.remove = __exit_p(wdt_gpi_remove),
|
|
|
|
.shutdown = NULL,
|
|
|
|
.suspend = NULL,
|
|
|
|
.resume = NULL,
|
|
|
|
};
|
2006-08-15 03:55:29 +08:00
|
|
|
|
|
|
|
static int __init wdt_gpi_init_module(void)
|
|
|
|
{
|
|
|
|
atomic_set(&opencnt, 1);
|
|
|
|
if (timeout > MAX_TIMEOUT_SECONDS)
|
|
|
|
timeout = MAX_TIMEOUT_SECONDS;
|
|
|
|
return driver_register(&wdt_gpi_driver);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit wdt_gpi_cleanup_module(void)
|
|
|
|
{
|
|
|
|
driver_unregister(&wdt_gpi_driver);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(wdt_gpi_init_module);
|
|
|
|
module_exit(wdt_gpi_cleanup_module);
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Thomas Koeller <thomas.koeller@baslerweb.com>");
|
|
|
|
MODULE_DESCRIPTION("Basler eXcite watchdog driver for gpi devices");
|
|
|
|
MODULE_VERSION("0.1");
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
|
2006-11-18 04:51:35 +08:00
|
|
|
|