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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 ...
436 lines
11 KiB
C
436 lines
11 KiB
C
/*
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* AMD Elan SC520 processor Watchdog Timer driver
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*
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* Based on acquirewdt.c by Alan Cox,
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* and sbc60xxwdt.c by Jakob Oestergaard <jakob@unthought.net>
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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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* The authors do NOT admit liability nor provide warranty for
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* any of this software. This material is provided "AS-IS" in
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* the hope that it may be useful for others.
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*
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* (c) Copyright 2001 Scott Jennings <linuxdrivers@oro.net>
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* 9/27 - 2001 [Initial release]
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*
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* Additional fixes Alan Cox
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* - Fixed formatting
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* - Removed debug printks
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* - Fixed SMP built kernel deadlock
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* - Switched to private locks not lock_kernel
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* - Used ioremap/writew/readw
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* - Added NOWAYOUT support
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* 4/12 - 2002 Changes by Rob Radez <rob@osinvestor.com>
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* - Change comments
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* - Eliminate fop_llseek
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* - Change CONFIG_WATCHDOG_NOWAYOUT semantics
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* - Add KERN_* tags to printks
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* - fix possible wdt_is_open race
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* - Report proper capabilities in watchdog_info
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* - Add WDIOC_{GETSTATUS, GETBOOTSTATUS, SETTIMEOUT,
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* GETTIMEOUT, SETOPTIONS} ioctls
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* 09/8 - 2003 Changes by Wim Van Sebroeck <wim@iguana.be>
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* - cleanup of trailing spaces
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* - added extra printk's for startup problems
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* - use module_param
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* - made timeout (the emulated heartbeat) a module_param
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* - made the keepalive ping an internal subroutine
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* 3/27 - 2004 Changes by Sean Young <sean@mess.org>
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* - set MMCR_BASE to 0xfffef000
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* - CBAR does not need to be read
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* - removed debugging printks
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*
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* This WDT driver is different from most other Linux WDT
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* drivers in that the driver will ping the watchdog by itself,
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* because this particular WDT has a very short timeout (1.6
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* seconds) and it would be insane to count on any userspace
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* daemon always getting scheduled within that time frame.
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*
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* This driver uses memory mapped IO, and spinlock.
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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/timer.h>
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#include <linux/miscdevice.h>
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#include <linux/watchdog.h>
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#include <linux/fs.h>
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#include <linux/ioport.h>
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#include <linux/notifier.h>
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#include <linux/reboot.h>
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#include <linux/init.h>
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#include <linux/jiffies.h>
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#include <linux/io.h>
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#include <linux/uaccess.h>
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/*
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* The AMD Elan SC520 timeout value is 492us times a power of 2 (0-7)
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*
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* 0: 492us 2: 1.01s 4: 4.03s 6: 16.22s
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* 1: 503ms 3: 2.01s 5: 8.05s 7: 32.21s
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*
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* We will program the SC520 watchdog for a timeout of 2.01s.
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* If we reset the watchdog every ~250ms we should be safe.
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*/
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#define WDT_INTERVAL (HZ/4+1)
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/*
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* We must not require too good response from the userspace daemon.
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* Here we require the userspace daemon to send us a heartbeat
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* char to /dev/watchdog every 30 seconds.
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*/
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#define WATCHDOG_TIMEOUT 30 /* 30 sec default timeout */
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/* in seconds, will be multiplied by HZ to get seconds to wait for a ping */
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static int timeout = WATCHDOG_TIMEOUT;
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module_param(timeout, int, 0);
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MODULE_PARM_DESC(timeout,
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"Watchdog timeout in seconds. (1 <= timeout <= 3600, default="
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__MODULE_STRING(WATCHDOG_TIMEOUT) ")");
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static bool nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, bool, 0);
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MODULE_PARM_DESC(nowayout,
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"Watchdog cannot be stopped once started (default="
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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/*
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* AMD Elan SC520 - Watchdog Timer Registers
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*/
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#define MMCR_BASE 0xfffef000 /* The default base address */
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#define OFFS_WDTMRCTL 0xCB0 /* Watchdog Timer Control Register */
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/* WDT Control Register bit definitions */
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#define WDT_EXP_SEL_01 0x0001 /* [01] Time-out = 496 us (with 33 Mhz clk). */
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#define WDT_EXP_SEL_02 0x0002 /* [02] Time-out = 508 ms (with 33 Mhz clk). */
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#define WDT_EXP_SEL_03 0x0004 /* [03] Time-out = 1.02 s (with 33 Mhz clk). */
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#define WDT_EXP_SEL_04 0x0008 /* [04] Time-out = 2.03 s (with 33 Mhz clk). */
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#define WDT_EXP_SEL_05 0x0010 /* [05] Time-out = 4.07 s (with 33 Mhz clk). */
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#define WDT_EXP_SEL_06 0x0020 /* [06] Time-out = 8.13 s (with 33 Mhz clk). */
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#define WDT_EXP_SEL_07 0x0040 /* [07] Time-out = 16.27s (with 33 Mhz clk). */
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#define WDT_EXP_SEL_08 0x0080 /* [08] Time-out = 32.54s (with 33 Mhz clk). */
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#define WDT_IRQ_FLG 0x1000 /* [12] Interrupt Request Flag */
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#define WDT_WRST_ENB 0x4000 /* [14] Watchdog Timer Reset Enable */
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#define WDT_ENB 0x8000 /* [15] Watchdog Timer Enable */
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static __u16 __iomem *wdtmrctl;
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static void wdt_timer_ping(unsigned long);
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static DEFINE_TIMER(timer, wdt_timer_ping, 0, 0);
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static unsigned long next_heartbeat;
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static unsigned long wdt_is_open;
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static char wdt_expect_close;
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static DEFINE_SPINLOCK(wdt_spinlock);
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/*
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* Whack the dog
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*/
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static void wdt_timer_ping(unsigned long data)
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{
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/* If we got a heartbeat pulse within the WDT_US_INTERVAL
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* we agree to ping the WDT
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*/
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if (time_before(jiffies, next_heartbeat)) {
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/* Ping the WDT */
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spin_lock(&wdt_spinlock);
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writew(0xAAAA, wdtmrctl);
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writew(0x5555, wdtmrctl);
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spin_unlock(&wdt_spinlock);
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/* Re-set the timer interval */
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mod_timer(&timer, jiffies + WDT_INTERVAL);
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} else
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pr_warn("Heartbeat lost! Will not ping the watchdog\n");
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}
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/*
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* Utility routines
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*/
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static void wdt_config(int writeval)
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{
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__u16 dummy;
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unsigned long flags;
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/* buy some time (ping) */
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spin_lock_irqsave(&wdt_spinlock, flags);
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dummy = readw(wdtmrctl); /* ensure write synchronization */
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writew(0xAAAA, wdtmrctl);
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writew(0x5555, wdtmrctl);
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/* unlock WDT = make WDT configuration register writable one time */
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writew(0x3333, wdtmrctl);
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writew(0xCCCC, wdtmrctl);
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/* write WDT configuration register */
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writew(writeval, wdtmrctl);
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spin_unlock_irqrestore(&wdt_spinlock, flags);
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}
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static int wdt_startup(void)
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{
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next_heartbeat = jiffies + (timeout * HZ);
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/* Start the timer */
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mod_timer(&timer, jiffies + WDT_INTERVAL);
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/* Start the watchdog */
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wdt_config(WDT_ENB | WDT_WRST_ENB | WDT_EXP_SEL_04);
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pr_info("Watchdog timer is now enabled\n");
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return 0;
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}
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static int wdt_turnoff(void)
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{
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/* Stop the timer */
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del_timer(&timer);
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/* Stop the watchdog */
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wdt_config(0);
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pr_info("Watchdog timer is now disabled...\n");
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return 0;
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}
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static int wdt_keepalive(void)
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{
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/* user land ping */
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next_heartbeat = jiffies + (timeout * HZ);
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return 0;
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}
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static int wdt_set_heartbeat(int t)
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{
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if ((t < 1) || (t > 3600)) /* arbitrary upper limit */
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return -EINVAL;
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timeout = t;
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return 0;
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}
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/*
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* /dev/watchdog handling
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*/
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static ssize_t fop_write(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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/* See if we got the magic character 'V' and reload the timer */
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if (count) {
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if (!nowayout) {
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size_t ofs;
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/* note: just in case someone wrote the magic character
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* five months ago... */
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wdt_expect_close = 0;
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/* now scan */
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for (ofs = 0; ofs != count; ofs++) {
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char c;
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if (get_user(c, buf + ofs))
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return -EFAULT;
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if (c == 'V')
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wdt_expect_close = 42;
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}
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}
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/* Well, anyhow someone wrote to us, we should
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return that favour */
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wdt_keepalive();
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}
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return count;
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}
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static int fop_open(struct inode *inode, struct file *file)
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{
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/* Just in case we're already talking to someone... */
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if (test_and_set_bit(0, &wdt_is_open))
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return -EBUSY;
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if (nowayout)
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__module_get(THIS_MODULE);
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/* Good, fire up the show */
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wdt_startup();
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return nonseekable_open(inode, file);
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}
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static int fop_close(struct inode *inode, struct file *file)
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{
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if (wdt_expect_close == 42)
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wdt_turnoff();
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else {
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pr_crit("Unexpected close, not stopping watchdog!\n");
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wdt_keepalive();
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}
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clear_bit(0, &wdt_is_open);
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wdt_expect_close = 0;
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return 0;
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}
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static long fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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void __user *argp = (void __user *)arg;
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int __user *p = argp;
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static const struct watchdog_info ident = {
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.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT
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| WDIOF_MAGICCLOSE,
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.firmware_version = 1,
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.identity = "SC520",
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};
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
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case WDIOC_GETSTATUS:
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case WDIOC_GETBOOTSTATUS:
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return put_user(0, p);
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case WDIOC_SETOPTIONS:
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{
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int new_options, retval = -EINVAL;
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if (get_user(new_options, p))
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return -EFAULT;
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if (new_options & WDIOS_DISABLECARD) {
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wdt_turnoff();
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retval = 0;
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}
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if (new_options & WDIOS_ENABLECARD) {
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wdt_startup();
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retval = 0;
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}
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return retval;
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}
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case WDIOC_KEEPALIVE:
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wdt_keepalive();
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return 0;
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case WDIOC_SETTIMEOUT:
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{
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int new_timeout;
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if (get_user(new_timeout, p))
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return -EFAULT;
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if (wdt_set_heartbeat(new_timeout))
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return -EINVAL;
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wdt_keepalive();
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/* Fall through */
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}
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case WDIOC_GETTIMEOUT:
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return put_user(timeout, p);
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default:
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return -ENOTTY;
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}
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}
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static const struct file_operations wdt_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.write = fop_write,
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.open = fop_open,
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.release = fop_close,
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.unlocked_ioctl = fop_ioctl,
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};
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static struct miscdevice wdt_miscdev = {
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.minor = WATCHDOG_MINOR,
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.name = "watchdog",
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.fops = &wdt_fops,
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};
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/*
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* Notifier for system down
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*/
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static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
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void *unused)
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{
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if (code == SYS_DOWN || code == SYS_HALT)
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wdt_turnoff();
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return NOTIFY_DONE;
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}
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/*
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* The WDT needs to learn about soft shutdowns in order to
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* turn the timebomb registers off.
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*/
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static struct notifier_block wdt_notifier = {
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.notifier_call = wdt_notify_sys,
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};
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static void __exit sc520_wdt_unload(void)
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{
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if (!nowayout)
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wdt_turnoff();
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/* Deregister */
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misc_deregister(&wdt_miscdev);
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unregister_reboot_notifier(&wdt_notifier);
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iounmap(wdtmrctl);
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}
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static int __init sc520_wdt_init(void)
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{
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int rc = -EBUSY;
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/* Check that the timeout value is within it's range ;
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if not reset to the default */
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if (wdt_set_heartbeat(timeout)) {
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wdt_set_heartbeat(WATCHDOG_TIMEOUT);
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pr_info("timeout value must be 1 <= timeout <= 3600, using %d\n",
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WATCHDOG_TIMEOUT);
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}
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wdtmrctl = ioremap(MMCR_BASE + OFFS_WDTMRCTL, 2);
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if (!wdtmrctl) {
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pr_err("Unable to remap memory\n");
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rc = -ENOMEM;
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goto err_out_region2;
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}
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rc = register_reboot_notifier(&wdt_notifier);
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if (rc) {
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pr_err("cannot register reboot notifier (err=%d)\n", rc);
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goto err_out_ioremap;
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}
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rc = misc_register(&wdt_miscdev);
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if (rc) {
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pr_err("cannot register miscdev on minor=%d (err=%d)\n",
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WATCHDOG_MINOR, rc);
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goto err_out_notifier;
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}
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pr_info("WDT driver for SC520 initialised. timeout=%d sec (nowayout=%d)\n",
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timeout, nowayout);
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return 0;
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err_out_notifier:
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unregister_reboot_notifier(&wdt_notifier);
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err_out_ioremap:
|
|
iounmap(wdtmrctl);
|
|
err_out_region2:
|
|
return rc;
|
|
}
|
|
|
|
module_init(sc520_wdt_init);
|
|
module_exit(sc520_wdt_unload);
|
|
|
|
MODULE_AUTHOR("Scott and Bill Jennings");
|
|
MODULE_DESCRIPTION(
|
|
"Driver for watchdog timer in AMD \"Elan\" SC520 uProcessor");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
|