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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 ...
530 lines
12 KiB
C
530 lines
12 KiB
C
/*
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* W83977F Watchdog Timer Driver for Winbond W83977F I/O Chip
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*
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* (c) Copyright 2005 Jose Goncalves <jose.goncalves@inov.pt>
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*
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* Based on w83877f_wdt.c by Scott Jennings,
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* and wdt977.c by Woody Suwalski
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*
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* -----------------------
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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/miscdevice.h>
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/watchdog.h>
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#include <linux/notifier.h>
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#include <linux/reboot.h>
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#include <linux/uaccess.h>
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#include <linux/io.h>
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#define WATCHDOG_VERSION "1.00"
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#define WATCHDOG_NAME "W83977F WDT"
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#define IO_INDEX_PORT 0x3F0
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#define IO_DATA_PORT (IO_INDEX_PORT+1)
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#define UNLOCK_DATA 0x87
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#define LOCK_DATA 0xAA
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#define DEVICE_REGISTER 0x07
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#define DEFAULT_TIMEOUT 45 /* default timeout in seconds */
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static int timeout = DEFAULT_TIMEOUT;
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static int timeoutW; /* timeout in watchdog counter units */
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static unsigned long timer_alive;
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static int testmode;
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static char expect_close;
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static DEFINE_SPINLOCK(spinlock);
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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 (15..7635), default="
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__MODULE_STRING(DEFAULT_TIMEOUT) ")");
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module_param(testmode, int, 0);
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MODULE_PARM_DESC(testmode, "Watchdog testmode (1 = no reboot), default=0");
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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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* Start the watchdog
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*/
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static int wdt_start(void)
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{
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unsigned long flags;
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spin_lock_irqsave(&spinlock, flags);
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/* Unlock the SuperIO chip */
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outb_p(UNLOCK_DATA, IO_INDEX_PORT);
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outb_p(UNLOCK_DATA, IO_INDEX_PORT);
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/*
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* Select device Aux2 (device=8) to set watchdog regs F2, F3 and F4.
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* F2 has the timeout in watchdog counter units.
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* F3 is set to enable watchdog LED blink at timeout.
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* F4 is used to just clear the TIMEOUT'ed state (bit 0).
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*/
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outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
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outb_p(0x08, IO_DATA_PORT);
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outb_p(0xF2, IO_INDEX_PORT);
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outb_p(timeoutW, IO_DATA_PORT);
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outb_p(0xF3, IO_INDEX_PORT);
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outb_p(0x08, IO_DATA_PORT);
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outb_p(0xF4, IO_INDEX_PORT);
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outb_p(0x00, IO_DATA_PORT);
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/* Set device Aux2 active */
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outb_p(0x30, IO_INDEX_PORT);
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outb_p(0x01, IO_DATA_PORT);
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/*
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* Select device Aux1 (dev=7) to set GP16 as the watchdog output
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* (in reg E6) and GP13 as the watchdog LED output (in reg E3).
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* Map GP16 at pin 119.
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* In test mode watch the bit 0 on F4 to indicate "triggered" or
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* check watchdog LED on SBC.
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*/
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outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
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outb_p(0x07, IO_DATA_PORT);
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if (!testmode) {
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unsigned pin_map;
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outb_p(0xE6, IO_INDEX_PORT);
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outb_p(0x0A, IO_DATA_PORT);
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outb_p(0x2C, IO_INDEX_PORT);
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pin_map = inb_p(IO_DATA_PORT);
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pin_map |= 0x10;
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pin_map &= ~(0x20);
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outb_p(0x2C, IO_INDEX_PORT);
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outb_p(pin_map, IO_DATA_PORT);
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}
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outb_p(0xE3, IO_INDEX_PORT);
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outb_p(0x08, IO_DATA_PORT);
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/* Set device Aux1 active */
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outb_p(0x30, IO_INDEX_PORT);
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outb_p(0x01, IO_DATA_PORT);
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/* Lock the SuperIO chip */
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outb_p(LOCK_DATA, IO_INDEX_PORT);
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spin_unlock_irqrestore(&spinlock, flags);
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pr_info("activated\n");
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return 0;
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}
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/*
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* Stop the watchdog
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*/
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static int wdt_stop(void)
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{
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unsigned long flags;
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spin_lock_irqsave(&spinlock, flags);
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/* Unlock the SuperIO chip */
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outb_p(UNLOCK_DATA, IO_INDEX_PORT);
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outb_p(UNLOCK_DATA, IO_INDEX_PORT);
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/*
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* Select device Aux2 (device=8) to set watchdog regs F2, F3 and F4.
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* F2 is reset to its default value (watchdog timer disabled).
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* F3 is reset to its default state.
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* F4 clears the TIMEOUT'ed state (bit 0) - back to default.
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*/
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outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
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outb_p(0x08, IO_DATA_PORT);
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outb_p(0xF2, IO_INDEX_PORT);
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outb_p(0xFF, IO_DATA_PORT);
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outb_p(0xF3, IO_INDEX_PORT);
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outb_p(0x00, IO_DATA_PORT);
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outb_p(0xF4, IO_INDEX_PORT);
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outb_p(0x00, IO_DATA_PORT);
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outb_p(0xF2, IO_INDEX_PORT);
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outb_p(0x00, IO_DATA_PORT);
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/*
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* Select device Aux1 (dev=7) to set GP16 (in reg E6) and
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* Gp13 (in reg E3) as inputs.
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*/
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outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
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outb_p(0x07, IO_DATA_PORT);
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if (!testmode) {
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outb_p(0xE6, IO_INDEX_PORT);
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outb_p(0x01, IO_DATA_PORT);
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}
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outb_p(0xE3, IO_INDEX_PORT);
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outb_p(0x01, IO_DATA_PORT);
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/* Lock the SuperIO chip */
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outb_p(LOCK_DATA, IO_INDEX_PORT);
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spin_unlock_irqrestore(&spinlock, flags);
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pr_info("shutdown\n");
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return 0;
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}
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/*
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* Send a keepalive ping to the watchdog
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* This is done by simply re-writing the timeout to reg. 0xF2
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*/
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static int wdt_keepalive(void)
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{
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unsigned long flags;
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spin_lock_irqsave(&spinlock, flags);
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/* Unlock the SuperIO chip */
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outb_p(UNLOCK_DATA, IO_INDEX_PORT);
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outb_p(UNLOCK_DATA, IO_INDEX_PORT);
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/* Select device Aux2 (device=8) to kick watchdog reg F2 */
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outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
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outb_p(0x08, IO_DATA_PORT);
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outb_p(0xF2, IO_INDEX_PORT);
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outb_p(timeoutW, IO_DATA_PORT);
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/* Lock the SuperIO chip */
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outb_p(LOCK_DATA, IO_INDEX_PORT);
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spin_unlock_irqrestore(&spinlock, flags);
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return 0;
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}
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/*
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* Set the watchdog timeout value
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*/
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static int wdt_set_timeout(int t)
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{
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int tmrval;
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/*
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* Convert seconds to watchdog counter time units, rounding up.
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* On PCM-5335 watchdog units are 30 seconds/step with 15 sec startup
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* value. This information is supplied in the PCM-5335 manual and was
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* checked by me on a real board. This is a bit strange because W83977f
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* datasheet says counter unit is in minutes!
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*/
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if (t < 15)
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return -EINVAL;
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tmrval = ((t + 15) + 29) / 30;
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if (tmrval > 255)
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return -EINVAL;
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/*
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* timeout is the timeout in seconds,
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* timeoutW is the timeout in watchdog counter units.
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*/
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timeoutW = tmrval;
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timeout = (timeoutW * 30) - 15;
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return 0;
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}
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/*
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* Get the watchdog status
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*/
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static int wdt_get_status(int *status)
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{
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int new_status;
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unsigned long flags;
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spin_lock_irqsave(&spinlock, flags);
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/* Unlock the SuperIO chip */
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outb_p(UNLOCK_DATA, IO_INDEX_PORT);
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outb_p(UNLOCK_DATA, IO_INDEX_PORT);
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/* Select device Aux2 (device=8) to read watchdog reg F4 */
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outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
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outb_p(0x08, IO_DATA_PORT);
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outb_p(0xF4, IO_INDEX_PORT);
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new_status = inb_p(IO_DATA_PORT);
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/* Lock the SuperIO chip */
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outb_p(LOCK_DATA, IO_INDEX_PORT);
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spin_unlock_irqrestore(&spinlock, flags);
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*status = 0;
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if (new_status & 1)
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*status |= WDIOF_CARDRESET;
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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 int wdt_open(struct inode *inode, struct file *file)
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{
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/* If the watchdog is alive we don't need to start it again */
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if (test_and_set_bit(0, &timer_alive))
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return -EBUSY;
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if (nowayout)
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__module_get(THIS_MODULE);
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wdt_start();
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return nonseekable_open(inode, file);
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}
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static int wdt_release(struct inode *inode, struct file *file)
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{
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/*
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* Shut off the timer.
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* Lock it in if it's a module and we set nowayout
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*/
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if (expect_close == 42) {
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wdt_stop();
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clear_bit(0, &timer_alive);
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} else {
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wdt_keepalive();
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pr_crit("unexpected close, not stopping watchdog!\n");
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}
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expect_close = 0;
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return 0;
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}
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/*
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* wdt_write:
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* @file: file handle to the watchdog
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* @buf: buffer to write (unused as data does not matter here
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* @count: count of bytes
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* @ppos: pointer to the position to write. No seeks allowed
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*
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* A write to a watchdog device is defined as a keepalive signal. Any
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* write of data will do, as we we don't define content meaning.
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*/
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static ssize_t wdt_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
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magic character long ago */
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expect_close = 0;
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/* scan to see whether or not we got the
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magic character */
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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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expect_close = 42;
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}
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}
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/* someone wrote to us, we should restart timer */
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wdt_keepalive();
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}
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return count;
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}
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/*
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* wdt_ioctl:
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* @inode: inode of the device
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* @file: file handle to the device
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* @cmd: watchdog command
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* @arg: argument pointer
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*
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* The watchdog API defines a common set of functions for all watchdogs
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* according to their available features.
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*/
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static const struct watchdog_info ident = {
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.options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
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.firmware_version = 1,
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.identity = WATCHDOG_NAME,
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};
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static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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int status;
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int new_options, retval = -EINVAL;
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int new_timeout;
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union {
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struct watchdog_info __user *ident;
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int __user *i;
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} uarg;
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uarg.i = (int __user *)arg;
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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return copy_to_user(uarg.ident, &ident,
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sizeof(ident)) ? -EFAULT : 0;
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case WDIOC_GETSTATUS:
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wdt_get_status(&status);
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return put_user(status, uarg.i);
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case WDIOC_GETBOOTSTATUS:
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return put_user(0, uarg.i);
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case WDIOC_SETOPTIONS:
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if (get_user(new_options, uarg.i))
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return -EFAULT;
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if (new_options & WDIOS_DISABLECARD) {
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wdt_stop();
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retval = 0;
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}
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if (new_options & WDIOS_ENABLECARD) {
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wdt_start();
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retval = 0;
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}
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return retval;
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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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if (get_user(new_timeout, uarg.i))
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return -EFAULT;
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if (wdt_set_timeout(new_timeout))
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return -EINVAL;
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wdt_keepalive();
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/* Fall */
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case WDIOC_GETTIMEOUT:
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return put_user(timeout, uarg.i);
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default:
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return -ENOTTY;
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}
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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)
|
|
{
|
|
if (code == SYS_DOWN || code == SYS_HALT)
|
|
wdt_stop();
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static const struct file_operations wdt_fops = {
|
|
.owner = THIS_MODULE,
|
|
.llseek = no_llseek,
|
|
.write = wdt_write,
|
|
.unlocked_ioctl = wdt_ioctl,
|
|
.open = wdt_open,
|
|
.release = wdt_release,
|
|
};
|
|
|
|
static struct miscdevice wdt_miscdev = {
|
|
.minor = WATCHDOG_MINOR,
|
|
.name = "watchdog",
|
|
.fops = &wdt_fops,
|
|
};
|
|
|
|
static struct notifier_block wdt_notifier = {
|
|
.notifier_call = wdt_notify_sys,
|
|
};
|
|
|
|
static int __init w83977f_wdt_init(void)
|
|
{
|
|
int rc;
|
|
|
|
pr_info("driver v%s\n", WATCHDOG_VERSION);
|
|
|
|
/*
|
|
* Check that the timeout value is within it's range;
|
|
* if not reset to the default
|
|
*/
|
|
if (wdt_set_timeout(timeout)) {
|
|
wdt_set_timeout(DEFAULT_TIMEOUT);
|
|
pr_info("timeout value must be 15 <= timeout <= 7635, using %d\n",
|
|
DEFAULT_TIMEOUT);
|
|
}
|
|
|
|
if (!request_region(IO_INDEX_PORT, 2, WATCHDOG_NAME)) {
|
|
pr_err("I/O address 0x%04x already in use\n", IO_INDEX_PORT);
|
|
rc = -EIO;
|
|
goto err_out;
|
|
}
|
|
|
|
rc = register_reboot_notifier(&wdt_notifier);
|
|
if (rc) {
|
|
pr_err("cannot register reboot notifier (err=%d)\n", rc);
|
|
goto err_out_region;
|
|
}
|
|
|
|
rc = misc_register(&wdt_miscdev);
|
|
if (rc) {
|
|
pr_err("cannot register miscdev on minor=%d (err=%d)\n",
|
|
wdt_miscdev.minor, rc);
|
|
goto err_out_reboot;
|
|
}
|
|
|
|
pr_info("initialized. timeout=%d sec (nowayout=%d testmode=%d)\n",
|
|
timeout, nowayout, testmode);
|
|
|
|
return 0;
|
|
|
|
err_out_reboot:
|
|
unregister_reboot_notifier(&wdt_notifier);
|
|
err_out_region:
|
|
release_region(IO_INDEX_PORT, 2);
|
|
err_out:
|
|
return rc;
|
|
}
|
|
|
|
static void __exit w83977f_wdt_exit(void)
|
|
{
|
|
wdt_stop();
|
|
misc_deregister(&wdt_miscdev);
|
|
unregister_reboot_notifier(&wdt_notifier);
|
|
release_region(IO_INDEX_PORT, 2);
|
|
}
|
|
|
|
module_init(w83977f_wdt_init);
|
|
module_exit(w83977f_wdt_exit);
|
|
|
|
MODULE_AUTHOR("Jose Goncalves <jose.goncalves@inov.pt>");
|
|
MODULE_DESCRIPTION("Driver for watchdog timer in W83977F I/O chip");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
|