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-----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIVAwUAT3NKzROxKuMESys7AQKElw/+JyDxJSlj+g+nymkx8IVVuU8CsEwNLgRk 8KEnRfLhGtkXFLSJYWO6jzGo16F8Uqli1PdMFte/wagSv0285/HZaKlkkBVHdJ/m u40oSjgT013bBh6MQ0Oaf8pFezFUiQB5zPOA9QGaLVGDLXCmgqUgd7exaD5wRIwB ZmyItjZeAVnDfk1R+ZiNYytHAi8A5wSB+eFDCIQYgyulA1Igd1UnRtx+dRKbvc/m rWQ6KWbZHIdvP1ksd8wHHkrlUD2pEeJ8glJLsZUhMm/5oMf/8RmOCvmo8rvE/qwl eDQ1h4cGYlfjobxXZMHqAN9m7Jg2bI946HZjdb7/7oCeO6VW3FwPZ/Ic75p+wp45 HXJTItufERYk6QxShiOKvA+QexnYwY0IT5oRP4DrhdVB/X9cl2MoaZHC+RbYLQy+ /5VNZKi38iK4F9AbFamS7kd0i5QszA/ZzEzKZ6VMuOp3W/fagpn4ZJT1LIA3m4A9 Q0cj24mqeyCfjysu0TMbPtaN+Yjeu1o1OFRvM8XffbZsp5bNzuTDEvviJ2NXw4vK 4qUHulhYSEWcu9YgAZXvEWDEM78FXCkg2v/CrZXH5tyc95kUkMPcgG+QZBB5wElR FaOKpiC/BuNIGEf02IZQ4nfDxE90QwnDeoYeV+FvNj9UEOopJ5z5bMPoTHxm4cCD NypQthI85pc= =G9mT -----END PGP SIGNATURE----- Merge tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system Pull "Disintegrate and delete asm/system.h" from David Howells: "Here are a bunch of patches to disintegrate asm/system.h into a set of separate bits to relieve the problem of circular inclusion dependencies. I've built all the working defconfigs from all the arches that I can and made sure that they don't break. The reason for these patches is that I recently encountered a circular dependency problem that came about when I produced some patches to optimise get_order() by rewriting it to use ilog2(). This uses bitops - and on the SH arch asm/bitops.h drags in asm-generic/get_order.h by a circuituous route involving asm/system.h. The main difficulty seems to be asm/system.h. It holds a number of low level bits with no/few dependencies that are commonly used (eg. memory barriers) and a number of bits with more dependencies that aren't used in many places (eg. switch_to()). These patches break asm/system.h up into the following core pieces: (1) asm/barrier.h Move memory barriers here. This already done for MIPS and Alpha. (2) asm/switch_to.h Move switch_to() and related stuff here. (3) asm/exec.h Move arch_align_stack() here. Other process execution related bits could perhaps go here from asm/processor.h. (4) asm/cmpxchg.h Move xchg() and cmpxchg() here as they're full word atomic ops and frequently used by atomic_xchg() and atomic_cmpxchg(). (5) asm/bug.h Move die() and related bits. (6) asm/auxvec.h Move AT_VECTOR_SIZE_ARCH here. Other arch headers are created as needed on a per-arch basis." Fixed up some conflicts from other header file cleanups and moving code around that has happened in the meantime, so David's testing is somewhat weakened by that. We'll find out anything that got broken and fix it.. * tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system: (38 commits) Delete all instances of asm/system.h Remove all #inclusions of asm/system.h Add #includes needed to permit the removal of asm/system.h Move all declarations of free_initmem() to linux/mm.h Disintegrate asm/system.h for OpenRISC Split arch_align_stack() out from asm-generic/system.h Split the switch_to() wrapper out of asm-generic/system.h Move the asm-generic/system.h xchg() implementation to asm-generic/cmpxchg.h Create asm-generic/barrier.h Make asm-generic/cmpxchg.h #include asm-generic/cmpxchg-local.h Disintegrate asm/system.h for Xtensa Disintegrate asm/system.h for Unicore32 [based on ver #3, changed by gxt] Disintegrate asm/system.h for Tile Disintegrate asm/system.h for Sparc Disintegrate asm/system.h for SH Disintegrate asm/system.h for Score Disintegrate asm/system.h for S390 Disintegrate asm/system.h for PowerPC Disintegrate asm/system.h for PA-RISC Disintegrate asm/system.h for MN10300 ...
234 lines
4.8 KiB
C
234 lines
4.8 KiB
C
/*
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* Intel 21285 watchdog driver
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* Copyright (c) Phil Blundell <pb@nexus.co.uk>, 1998
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*
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* based on
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*
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* SoftDog 0.05: A Software Watchdog Device
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*
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* (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>,
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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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/mm.h>
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#include <linux/miscdevice.h>
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#include <linux/watchdog.h>
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#include <linux/reboot.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/uaccess.h>
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#include <linux/irq.h>
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#include <mach/hardware.h>
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#include <asm/mach-types.h>
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#include <asm/system_info.h>
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#include <asm/hardware/dec21285.h>
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/*
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* Define this to stop the watchdog actually rebooting the machine.
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*/
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#undef ONLY_TESTING
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static unsigned int soft_margin = 60; /* in seconds */
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static unsigned int reload;
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static unsigned long timer_alive;
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#ifdef ONLY_TESTING
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/*
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* If the timer expires..
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*/
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static void watchdog_fire(int irq, void *dev_id)
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{
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pr_crit("Would Reboot\n");
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*CSR_TIMER4_CNTL = 0;
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*CSR_TIMER4_CLR = 0;
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}
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#endif
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/*
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* Refresh the timer.
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*/
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static void watchdog_ping(void)
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{
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*CSR_TIMER4_LOAD = reload;
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}
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/*
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* Allow only one person to hold it open
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*/
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static int watchdog_open(struct inode *inode, struct file *file)
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{
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int ret;
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if (*CSR_SA110_CNTL & (1 << 13))
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return -EBUSY;
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if (test_and_set_bit(1, &timer_alive))
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return -EBUSY;
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reload = soft_margin * (mem_fclk_21285 / 256);
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*CSR_TIMER4_CLR = 0;
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watchdog_ping();
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*CSR_TIMER4_CNTL = TIMER_CNTL_ENABLE | TIMER_CNTL_AUTORELOAD
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| TIMER_CNTL_DIV256;
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#ifdef ONLY_TESTING
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ret = request_irq(IRQ_TIMER4, watchdog_fire, 0, "watchdog", NULL);
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if (ret) {
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*CSR_TIMER4_CNTL = 0;
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clear_bit(1, &timer_alive);
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}
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#else
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/*
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* Setting this bit is irreversible; once enabled, there is
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* no way to disable the watchdog.
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*/
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*CSR_SA110_CNTL |= 1 << 13;
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ret = 0;
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#endif
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nonseekable_open(inode, file);
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return ret;
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}
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/*
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* Shut off the timer.
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* Note: if we really have enabled the watchdog, there
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* is no way to turn off.
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*/
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static int watchdog_release(struct inode *inode, struct file *file)
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{
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#ifdef ONLY_TESTING
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free_irq(IRQ_TIMER4, NULL);
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clear_bit(1, &timer_alive);
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#endif
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return 0;
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}
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static ssize_t watchdog_write(struct file *file, const char __user *data,
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size_t len, loff_t *ppos)
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{
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/*
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* Refresh the timer.
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*/
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if (len)
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watchdog_ping();
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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_SETTIMEOUT,
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.identity = "Footbridge Watchdog",
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};
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static long watchdog_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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unsigned int new_margin;
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int __user *int_arg = (int __user *)arg;
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int ret = -ENOTTY;
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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ret = 0;
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if (copy_to_user((void __user *)arg, &ident, sizeof(ident)))
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ret = -EFAULT;
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break;
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case WDIOC_GETSTATUS:
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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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watchdog_ping();
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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(new_margin, int_arg);
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if (ret)
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break;
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/* Arbitrary, can't find the card's limits */
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if (new_margin < 0 || new_margin > 60) {
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ret = -EINVAL;
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break;
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}
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soft_margin = new_margin;
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reload = soft_margin * (mem_fclk_21285 / 256);
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watchdog_ping();
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/* Fall */
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case WDIOC_GETTIMEOUT:
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ret = put_user(soft_margin, 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 const struct file_operations watchdog_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.write = watchdog_write,
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.unlocked_ioctl = watchdog_ioctl,
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.open = watchdog_open,
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.release = watchdog_release,
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};
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static struct miscdevice watchdog_miscdev = {
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.minor = WATCHDOG_MINOR,
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.name = "watchdog",
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.fops = &watchdog_fops,
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};
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static int __init footbridge_watchdog_init(void)
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{
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int retval;
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if (machine_is_netwinder())
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return -ENODEV;
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retval = misc_register(&watchdog_miscdev);
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if (retval < 0)
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return retval;
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pr_info("Footbridge Watchdog Timer: 0.01, timer margin: %d sec\n",
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soft_margin);
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if (machine_is_cats())
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pr_warn("Warning: Watchdog reset may not work on this machine\n");
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return 0;
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}
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static void __exit footbridge_watchdog_exit(void)
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{
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misc_deregister(&watchdog_miscdev);
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}
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MODULE_AUTHOR("Phil Blundell <pb@nexus.co.uk>");
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MODULE_DESCRIPTION("Footbridge watchdog driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
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module_param(soft_margin, int, 0);
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MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
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module_init(footbridge_watchdog_init);
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module_exit(footbridge_watchdog_exit);
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