499 lines
11 KiB
C
499 lines
11 KiB
C
/*
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* w83627hf/thf WDT driver
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*
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* (c) Copyright 2013 Guenter Roeck
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* converted to watchdog infrastructure
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*
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* (c) Copyright 2007 Vlad Drukker <vlad@storewiz.com>
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* added support for W83627THF.
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*
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* (c) Copyright 2003,2007 Pádraig Brady <P@draigBrady.com>
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*
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* Based on advantechwdt.c which is based on wdt.c.
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* Original copyright messages:
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*
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* (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>
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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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* Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
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* warranty for any of this software. This material is provided
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* "AS-IS" and at no charge.
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*
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* (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk>
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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/watchdog.h>
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#include <linux/ioport.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#define WATCHDOG_NAME "w83627hf/thf/hg/dhg WDT"
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#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */
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static int wdt_io;
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static int cr_wdt_timeout; /* WDT timeout register */
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static int cr_wdt_control; /* WDT control register */
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static int cr_wdt_csr; /* WDT control & status register */
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enum chips { w83627hf, w83627s, w83697hf, w83697ug, w83637hf, w83627thf,
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w83687thf, w83627ehf, w83627dhg, w83627uhg, w83667hg, w83627dhg_p,
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w83667hg_b, nct6775, nct6776, nct6779, nct6791, nct6792, nct6793,
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nct6795, nct6102 };
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static int timeout; /* in seconds */
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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 <= 255, 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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static int early_disable;
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module_param(early_disable, int, 0);
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MODULE_PARM_DESC(early_disable, "Disable watchdog at boot time (default=0)");
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/*
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* Kernel methods.
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*/
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#define WDT_EFER (wdt_io+0) /* Extended Function Enable Registers */
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#define WDT_EFIR (wdt_io+0) /* Extended Function Index Register
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(same as EFER) */
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#define WDT_EFDR (WDT_EFIR+1) /* Extended Function Data Register */
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#define W83627HF_LD_WDT 0x08
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#define W83627HF_ID 0x52
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#define W83627S_ID 0x59
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#define W83697HF_ID 0x60
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#define W83697UG_ID 0x68
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#define W83637HF_ID 0x70
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#define W83627THF_ID 0x82
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#define W83687THF_ID 0x85
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#define W83627EHF_ID 0x88
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#define W83627DHG_ID 0xa0
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#define W83627UHG_ID 0xa2
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#define W83667HG_ID 0xa5
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#define W83627DHG_P_ID 0xb0
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#define W83667HG_B_ID 0xb3
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#define NCT6775_ID 0xb4
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#define NCT6776_ID 0xc3
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#define NCT6102_ID 0xc4
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#define NCT6779_ID 0xc5
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#define NCT6791_ID 0xc8
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#define NCT6792_ID 0xc9
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#define NCT6793_ID 0xd1
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#define NCT6795_ID 0xd3
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#define W83627HF_WDT_TIMEOUT 0xf6
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#define W83697HF_WDT_TIMEOUT 0xf4
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#define NCT6102D_WDT_TIMEOUT 0xf1
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#define W83627HF_WDT_CONTROL 0xf5
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#define W83697HF_WDT_CONTROL 0xf3
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#define NCT6102D_WDT_CONTROL 0xf0
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#define W836X7HF_WDT_CSR 0xf7
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#define NCT6102D_WDT_CSR 0xf2
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static void superio_outb(int reg, int val)
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{
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outb(reg, WDT_EFER);
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outb(val, WDT_EFDR);
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}
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static inline int superio_inb(int reg)
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{
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outb(reg, WDT_EFER);
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return inb(WDT_EFDR);
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}
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static int superio_enter(void)
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{
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if (!request_muxed_region(wdt_io, 2, WATCHDOG_NAME))
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return -EBUSY;
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outb_p(0x87, WDT_EFER); /* Enter extended function mode */
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outb_p(0x87, WDT_EFER); /* Again according to manual */
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return 0;
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}
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static void superio_select(int ld)
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{
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superio_outb(0x07, ld);
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}
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static void superio_exit(void)
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{
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outb_p(0xAA, WDT_EFER); /* Leave extended function mode */
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release_region(wdt_io, 2);
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}
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static int w83627hf_init(struct watchdog_device *wdog, enum chips chip)
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{
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int ret;
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unsigned char t;
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ret = superio_enter();
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if (ret)
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return ret;
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superio_select(W83627HF_LD_WDT);
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/* set CR30 bit 0 to activate GPIO2 */
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t = superio_inb(0x30);
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if (!(t & 0x01))
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superio_outb(0x30, t | 0x01);
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switch (chip) {
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case w83627hf:
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case w83627s:
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t = superio_inb(0x2B) & ~0x10;
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superio_outb(0x2B, t); /* set GPIO24 to WDT0 */
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break;
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case w83697hf:
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/* Set pin 119 to WDTO# mode (= CR29, WDT0) */
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t = superio_inb(0x29) & ~0x60;
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t |= 0x20;
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superio_outb(0x29, t);
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break;
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case w83697ug:
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/* Set pin 118 to WDTO# mode */
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t = superio_inb(0x2b) & ~0x04;
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superio_outb(0x2b, t);
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break;
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case w83627thf:
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t = (superio_inb(0x2B) & ~0x08) | 0x04;
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superio_outb(0x2B, t); /* set GPIO3 to WDT0 */
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break;
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case w83627dhg:
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case w83627dhg_p:
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t = superio_inb(0x2D) & ~0x01; /* PIN77 -> WDT0# */
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superio_outb(0x2D, t); /* set GPIO5 to WDT0 */
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t = superio_inb(cr_wdt_control);
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t |= 0x02; /* enable the WDTO# output low pulse
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* to the KBRST# pin */
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superio_outb(cr_wdt_control, t);
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break;
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case w83637hf:
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break;
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case w83687thf:
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t = superio_inb(0x2C) & ~0x80; /* PIN47 -> WDT0# */
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superio_outb(0x2C, t);
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break;
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case w83627ehf:
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case w83627uhg:
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case w83667hg:
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case w83667hg_b:
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case nct6775:
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case nct6776:
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case nct6779:
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case nct6791:
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case nct6792:
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case nct6793:
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case nct6795:
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case nct6102:
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/*
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* These chips have a fixed WDTO# output pin (W83627UHG),
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* or support more than one WDTO# output pin.
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* Don't touch its configuration, and hope the BIOS
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* does the right thing.
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*/
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t = superio_inb(cr_wdt_control);
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t |= 0x02; /* enable the WDTO# output low pulse
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* to the KBRST# pin */
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superio_outb(cr_wdt_control, t);
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break;
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default:
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break;
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}
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t = superio_inb(cr_wdt_timeout);
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if (t != 0) {
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if (early_disable) {
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pr_warn("Stopping previously enabled watchdog until userland kicks in\n");
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superio_outb(cr_wdt_timeout, 0);
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} else {
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pr_info("Watchdog already running. Resetting timeout to %d sec\n",
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wdog->timeout);
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superio_outb(cr_wdt_timeout, wdog->timeout);
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}
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}
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/* set second mode & disable keyboard turning off watchdog */
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t = superio_inb(cr_wdt_control) & ~0x0C;
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superio_outb(cr_wdt_control, t);
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/* reset trigger, disable keyboard & mouse turning off watchdog */
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t = superio_inb(cr_wdt_csr) & ~0xD0;
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superio_outb(cr_wdt_csr, t);
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superio_exit();
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return 0;
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}
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static int wdt_set_time(unsigned int timeout)
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{
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int ret;
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ret = superio_enter();
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if (ret)
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return ret;
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superio_select(W83627HF_LD_WDT);
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superio_outb(cr_wdt_timeout, timeout);
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superio_exit();
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return 0;
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}
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static int wdt_start(struct watchdog_device *wdog)
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{
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return wdt_set_time(wdog->timeout);
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}
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static int wdt_stop(struct watchdog_device *wdog)
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{
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return wdt_set_time(0);
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}
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static int wdt_set_timeout(struct watchdog_device *wdog, unsigned int timeout)
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{
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wdog->timeout = timeout;
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return 0;
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}
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static unsigned int wdt_get_time(struct watchdog_device *wdog)
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{
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unsigned int timeleft;
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int ret;
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ret = superio_enter();
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if (ret)
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return 0;
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superio_select(W83627HF_LD_WDT);
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timeleft = superio_inb(cr_wdt_timeout);
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superio_exit();
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return timeleft;
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}
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/*
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* Kernel Interfaces
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*/
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static const struct watchdog_info wdt_info = {
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
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.identity = "W83627HF Watchdog",
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};
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static const struct watchdog_ops wdt_ops = {
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.owner = THIS_MODULE,
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.start = wdt_start,
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.stop = wdt_stop,
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.set_timeout = wdt_set_timeout,
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.get_timeleft = wdt_get_time,
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};
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static struct watchdog_device wdt_dev = {
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.info = &wdt_info,
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.ops = &wdt_ops,
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.timeout = WATCHDOG_TIMEOUT,
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.min_timeout = 1,
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.max_timeout = 255,
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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 int wdt_find(int addr)
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{
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u8 val;
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int ret;
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cr_wdt_timeout = W83627HF_WDT_TIMEOUT;
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cr_wdt_control = W83627HF_WDT_CONTROL;
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cr_wdt_csr = W836X7HF_WDT_CSR;
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ret = superio_enter();
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if (ret)
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return ret;
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superio_select(W83627HF_LD_WDT);
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val = superio_inb(0x20);
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switch (val) {
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case W83627HF_ID:
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ret = w83627hf;
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break;
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case W83627S_ID:
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ret = w83627s;
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break;
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case W83697HF_ID:
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ret = w83697hf;
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cr_wdt_timeout = W83697HF_WDT_TIMEOUT;
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cr_wdt_control = W83697HF_WDT_CONTROL;
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break;
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case W83697UG_ID:
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ret = w83697ug;
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cr_wdt_timeout = W83697HF_WDT_TIMEOUT;
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cr_wdt_control = W83697HF_WDT_CONTROL;
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break;
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case W83637HF_ID:
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ret = w83637hf;
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break;
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case W83627THF_ID:
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ret = w83627thf;
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break;
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case W83687THF_ID:
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ret = w83687thf;
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break;
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case W83627EHF_ID:
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ret = w83627ehf;
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break;
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case W83627DHG_ID:
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ret = w83627dhg;
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break;
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case W83627DHG_P_ID:
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ret = w83627dhg_p;
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break;
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case W83627UHG_ID:
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ret = w83627uhg;
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break;
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case W83667HG_ID:
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ret = w83667hg;
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break;
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case W83667HG_B_ID:
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ret = w83667hg_b;
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break;
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case NCT6775_ID:
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ret = nct6775;
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break;
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case NCT6776_ID:
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ret = nct6776;
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break;
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case NCT6779_ID:
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ret = nct6779;
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break;
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case NCT6791_ID:
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ret = nct6791;
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break;
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case NCT6792_ID:
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ret = nct6792;
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break;
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case NCT6793_ID:
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ret = nct6793;
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break;
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case NCT6795_ID:
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ret = nct6795;
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break;
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case NCT6102_ID:
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ret = nct6102;
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cr_wdt_timeout = NCT6102D_WDT_TIMEOUT;
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cr_wdt_control = NCT6102D_WDT_CONTROL;
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cr_wdt_csr = NCT6102D_WDT_CSR;
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break;
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case 0xff:
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ret = -ENODEV;
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break;
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default:
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ret = -ENODEV;
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pr_err("Unsupported chip ID: 0x%02x\n", val);
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break;
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}
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superio_exit();
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return ret;
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}
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static int __init wdt_init(void)
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{
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int ret;
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int chip;
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static const char * const chip_name[] = {
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"W83627HF",
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"W83627S",
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"W83697HF",
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"W83697UG",
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"W83637HF",
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"W83627THF",
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"W83687THF",
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"W83627EHF",
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"W83627DHG",
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"W83627UHG",
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"W83667HG",
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"W83667DHG-P",
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"W83667HG-B",
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"NCT6775",
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"NCT6776",
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"NCT6779",
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"NCT6791",
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"NCT6792",
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"NCT6793",
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"NCT6795",
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"NCT6102",
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};
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wdt_io = 0x2e;
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chip = wdt_find(0x2e);
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if (chip < 0) {
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wdt_io = 0x4e;
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chip = wdt_find(0x4e);
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if (chip < 0)
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return chip;
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}
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pr_info("WDT driver for %s Super I/O chip initialising\n",
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chip_name[chip]);
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watchdog_init_timeout(&wdt_dev, timeout, NULL);
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watchdog_set_nowayout(&wdt_dev, nowayout);
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watchdog_stop_on_reboot(&wdt_dev);
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ret = w83627hf_init(&wdt_dev, chip);
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if (ret) {
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pr_err("failed to initialize watchdog (err=%d)\n", ret);
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return ret;
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}
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ret = watchdog_register_device(&wdt_dev);
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if (ret)
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return ret;
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pr_info("initialized. timeout=%d sec (nowayout=%d)\n",
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wdt_dev.timeout, nowayout);
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return ret;
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}
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static void __exit wdt_exit(void)
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{
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watchdog_unregister_device(&wdt_dev);
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}
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module_init(wdt_init);
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module_exit(wdt_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Pádraig Brady <P@draigBrady.com>");
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MODULE_DESCRIPTION("w83627hf/thf WDT driver");
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