Merge git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog
* git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog: [WATCHDOG] Add support for the WM8350 watchdog [WATCHDOG] Add SMSC SCH311x Watchdog Timer. [WATCHDOG] ib700wdt - add timeout parameter
This commit is contained in:
Linus Torvalds
commit
ad6b646fe5
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@ -55,6 +55,13 @@ config SOFT_WATCHDOG
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To compile this driver as a module, choose M here: the
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module will be called softdog.
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config WM8350_WATCHDOG
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tristate "WM8350 watchdog"
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depends on MFD_WM8350
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help
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Support for the watchdog in the WM8350 AudioPlus PMIC. When
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the watchdog triggers the system will be reset.
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# ALPHA Architecture
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# ARM Architecture
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@ -551,6 +558,18 @@ config CPU5_WDT
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To compile this driver as a module, choose M here: the
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module will be called cpu5wdt.
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config SMSC_SCH311X_WDT
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tristate "SMSC SCH311X Watchdog Timer"
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depends on X86
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---help---
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This is the driver for the hardware watchdog timer on the
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SMSC SCH3112, SCH3114 and SCH3116 Super IO chipset
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(LPC IO with 8042 KBC, Reset Generation, HWM and multiple
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serial ports).
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To compile this driver as a module, choose M here: the
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module will be called sch311x_wdt.
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config SMSC37B787_WDT
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tristate "Winbond SMsC37B787 Watchdog Timer"
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depends on X86
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@ -83,6 +83,7 @@ obj-$(CONFIG_60XX_WDT) += sbc60xxwdt.o
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obj-$(CONFIG_SBC8360_WDT) += sbc8360.o
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obj-$(CONFIG_SBC7240_WDT) += sbc7240_wdt.o
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obj-$(CONFIG_CPU5_WDT) += cpu5wdt.o
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obj-$(CONFIG_SMSC_SCH311X_WDT) += sch311x_wdt.o
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obj-$(CONFIG_SMSC37B787_WDT) += smsc37b787_wdt.o
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obj-$(CONFIG_W83627HF_WDT) += w83627hf_wdt.o
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obj-$(CONFIG_W83697HF_WDT) += w83697hf_wdt.o
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@ -133,4 +134,5 @@ obj-$(CONFIG_WATCHDOG_CP1XXX) += cpwd.o
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# XTENSA Architecture
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# Architecture Independant
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obj-$(CONFIG_WM8350_WATCHDOG) += wm8350_wdt.o
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obj-$(CONFIG_SOFT_WATCHDOG) += softdog.o
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@ -91,32 +91,16 @@ static char expect_close;
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*
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*/
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static int wd_times[] = {
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30, /* 0x0 */
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28, /* 0x1 */
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26, /* 0x2 */
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24, /* 0x3 */
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22, /* 0x4 */
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20, /* 0x5 */
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18, /* 0x6 */
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16, /* 0x7 */
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14, /* 0x8 */
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12, /* 0x9 */
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10, /* 0xA */
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8, /* 0xB */
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6, /* 0xC */
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4, /* 0xD */
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2, /* 0xE */
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0, /* 0xF */
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};
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#define WDT_STOP 0x441
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#define WDT_START 0x443
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/* Default timeout */
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#define WD_TIMO 0 /* 30 seconds +/- 20%, from table */
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static int wd_margin = WD_TIMO;
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#define WATCHDOG_TIMEOUT 30 /* 30 seconds +/- 20% */
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static int timeout = WATCHDOG_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. 0<= timeout <=30, default="
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__MODULE_STRING(WATCHDOG_TIMEOUT) ".");
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static int nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, int, 0);
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@ -131,6 +115,8 @@ MODULE_PARM_DESC(nowayout,
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static void ibwdt_ping(void)
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{
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int wd_margin = 15 - ((timeout + 1) / 2);
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spin_lock(&ibwdt_lock);
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/* Write a watchdog value */
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@ -148,15 +134,10 @@ static void ibwdt_disable(void)
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static int ibwdt_set_heartbeat(int t)
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{
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int i;
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if ((t < 0) || (t > 30))
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if (t < 0 || t > 30)
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return -EINVAL;
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for (i = 0x0F; i > -1; i--)
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if (wd_times[i] >= t)
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break;
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wd_margin = i;
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timeout = t;
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return 0;
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}
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@ -240,7 +221,7 @@ static long ibwdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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/* Fall */
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case WDIOC_GETTIMEOUT:
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return put_user(wd_times[wd_margin], p);
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return put_user(timeout, p);
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default:
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return -ENOTTY;
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@ -317,6 +298,14 @@ static int __devinit ibwdt_probe(struct platform_device *dev)
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goto out_nostartreg;
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}
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/* Check that the heartbeat value is within it's range ;
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* if not reset to the default */
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if (ibwdt_set_heartbeat(timeout)) {
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ibwdt_set_heartbeat(WATCHDOG_TIMEOUT);
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printk(KERN_INFO PFX
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"timeout value must be 0<=x<=30, using %d\n", timeout);
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}
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res = misc_register(&ibwdt_miscdev);
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if (res) {
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printk(KERN_ERR PFX "failed to register misc device\n");
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@ -0,0 +1,578 @@
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/*
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* sch311x_wdt.c - Driver for the SCH311x Super-I/O chips
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* integrated watchdog.
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*
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* (c) Copyright 2008 Wim Van Sebroeck <wim@iguana.be>.
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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 Wim Van Sebroeck nor Iguana vzw. admit liability nor
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* provide warranty for any of this software. This material is
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* provided "AS-IS" and at no charge.
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*/
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/*
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* Includes, defines, variables, module parameters, ...
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*/
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/* Includes */
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#include <linux/module.h> /* For module specific items */
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#include <linux/moduleparam.h> /* For new moduleparam's */
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#include <linux/types.h> /* For standard types (like size_t) */
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#include <linux/errno.h> /* For the -ENODEV/... values */
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#include <linux/kernel.h> /* For printk/... */
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#include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV
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(WATCHDOG_MINOR) */
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#include <linux/watchdog.h> /* For the watchdog specific items */
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#include <linux/init.h> /* For __init/__exit/... */
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#include <linux/fs.h> /* For file operations */
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#include <linux/platform_device.h> /* For platform_driver framework */
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#include <linux/ioport.h> /* For io-port access */
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#include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */
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#include <linux/uaccess.h> /* For copy_to_user/put_user/... */
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#include <linux/io.h> /* For inb/outb/... */
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/* Module and version information */
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#define DRV_NAME "sch311x_wdt"
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#define PFX DRV_NAME ": "
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/* Runtime registers */
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#define RESGEN 0x1d
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#define GP60 0x47
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#define WDT_TIME_OUT 0x65
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#define WDT_VAL 0x66
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#define WDT_CFG 0x67
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#define WDT_CTRL 0x68
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/* internal variables */
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static unsigned long sch311x_wdt_is_open;
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static char sch311x_wdt_expect_close;
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static struct platform_device *sch311x_wdt_pdev;
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static int sch311x_ioports[] = { 0x2e, 0x4e, 0x162e, 0x164e, 0x00 };
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static struct { /* The devices private data */
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/* the Runtime Register base address */
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unsigned short runtime_reg;
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/* The card's boot status */
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int boot_status;
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/* the lock for io operations */
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spinlock_t io_lock;
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} sch311x_wdt_data;
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/* Module load parameters */
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static unsigned short force_id;
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module_param(force_id, ushort, 0);
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MODULE_PARM_DESC(force_id, "Override the detected device ID");
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static unsigned short therm_trip;
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module_param(therm_trip, ushort, 0);
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MODULE_PARM_DESC(therm_trip, "Should a ThermTrip trigger the reset generator");
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#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */
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static int timeout = WATCHDOG_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 <=15300, default="
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__MODULE_STRING(WATCHDOG_TIMEOUT) ".");
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static int nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, int, 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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* Super-IO functions
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*/
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static inline void sch311x_sio_enter(int sio_config_port)
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{
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outb(0x55, sio_config_port);
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}
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static inline void sch311x_sio_exit(int sio_config_port)
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{
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outb(0xaa, sio_config_port);
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}
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static inline int sch311x_sio_inb(int sio_config_port, int reg)
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{
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outb(reg, sio_config_port);
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return inb(sio_config_port + 1);
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}
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static inline void sch311x_sio_outb(int sio_config_port, int reg, int val)
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{
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outb(reg, sio_config_port);
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outb(val, sio_config_port + 1);
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}
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/*
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* Watchdog Operations
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*/
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static void sch311x_wdt_set_timeout(int t)
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{
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unsigned char timeout_unit = 0x80;
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/* When new timeout is bigger then 255 seconds, we will use minutes */
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if (t > 255) {
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timeout_unit = 0;
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t /= 60;
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}
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/* -- Watchdog Timeout --
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* Bit 0-6 (Reserved)
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* Bit 7 WDT Time-out Value Units Select
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* (0 = Minutes, 1 = Seconds)
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*/
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outb(timeout_unit, sch311x_wdt_data.runtime_reg + WDT_TIME_OUT);
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/* -- Watchdog Timer Time-out Value --
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* Bit 0-7 Binary coded units (0=Disabled, 1..255)
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*/
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outb(t, sch311x_wdt_data.runtime_reg + WDT_VAL);
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}
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static void sch311x_wdt_start(void)
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{
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spin_lock(&sch311x_wdt_data.io_lock);
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/* set watchdog's timeout */
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sch311x_wdt_set_timeout(timeout);
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/* enable the watchdog */
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/* -- General Purpose I/O Bit 6.0 --
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* Bit 0, In/Out: 0 = Output, 1 = Input
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* Bit 1, Polarity: 0 = No Invert, 1 = Invert
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* Bit 2-3, Function select: 00 = GPI/O, 01 = LED1, 11 = WDT,
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* 10 = Either Edge Triggered Intr.4
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* Bit 4-6 (Reserved)
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* Bit 7, Output Type: 0 = Push Pull Bit, 1 = Open Drain
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*/
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outb(0x0e, sch311x_wdt_data.runtime_reg + GP60);
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spin_unlock(&sch311x_wdt_data.io_lock);
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}
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static void sch311x_wdt_stop(void)
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{
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spin_lock(&sch311x_wdt_data.io_lock);
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/* stop the watchdog */
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outb(0x01, sch311x_wdt_data.runtime_reg + GP60);
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/* disable timeout by setting it to 0 */
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sch311x_wdt_set_timeout(0);
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spin_unlock(&sch311x_wdt_data.io_lock);
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}
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static void sch311x_wdt_keepalive(void)
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{
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spin_lock(&sch311x_wdt_data.io_lock);
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sch311x_wdt_set_timeout(timeout);
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spin_unlock(&sch311x_wdt_data.io_lock);
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}
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static int sch311x_wdt_set_heartbeat(int t)
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{
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if (t < 1 || t > (255*60))
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return -EINVAL;
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/* When new timeout is bigger then 255 seconds,
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* we will round up to minutes (with a max of 255) */
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if (t > 255)
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t = (((t - 1) / 60) + 1) * 60;
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timeout = t;
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return 0;
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}
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static void sch311x_wdt_get_status(int *status)
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{
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unsigned char new_status;
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*status = 0;
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spin_lock(&sch311x_wdt_data.io_lock);
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/* -- Watchdog timer control --
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* Bit 0 Status Bit: 0 = Timer counting, 1 = Timeout occured
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* Bit 1 Reserved
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* Bit 2 Force Timeout: 1 = Forces WD timeout event (self-cleaning)
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* Bit 3 P20 Force Timeout enabled:
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* 0 = P20 activity does not generate the WD timeout event
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* 1 = P20 Allows rising edge of P20, from the keyboard
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* controller, to force the WD timeout event.
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* Bit 4-7 Reserved
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*/
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new_status = inb(sch311x_wdt_data.runtime_reg + WDT_CTRL);
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if (new_status & 0x01)
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*status |= WDIOF_CARDRESET;
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spin_unlock(&sch311x_wdt_data.io_lock);
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}
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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 sch311x_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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if (count) {
|
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if (!nowayout) {
|
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size_t i;
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|
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sch311x_wdt_expect_close = 0;
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|
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for (i = 0; i != count; i++) {
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char c;
|
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if (get_user(c, buf + i))
|
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return -EFAULT;
|
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if (c == 'V')
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sch311x_wdt_expect_close = 42;
|
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}
|
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}
|
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sch311x_wdt_keepalive();
|
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}
|
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return count;
|
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}
|
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static long sch311x_wdt_ioctl(struct file *file, unsigned int cmd,
|
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unsigned long arg)
|
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{
|
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int status;
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int new_timeout;
|
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void __user *argp = (void __user *)arg;
|
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int __user *p = argp;
|
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static struct watchdog_info ident = {
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.options = WDIOF_KEEPALIVEPING |
|
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WDIOF_SETTIMEOUT |
|
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WDIOF_MAGICCLOSE,
|
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.firmware_version = 1,
|
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.identity = DRV_NAME,
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};
|
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switch (cmd) {
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case WDIOC_GETSUPPORT:
|
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if (copy_to_user(argp, &ident, sizeof(ident)))
|
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return -EFAULT;
|
||||
break;
|
||||
|
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case WDIOC_GETSTATUS:
|
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{
|
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sch311x_wdt_get_status(&status);
|
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return put_user(status, p);
|
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}
|
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case WDIOC_GETBOOTSTATUS:
|
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return put_user(sch311x_wdt_data.boot_status, p);
|
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|
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case WDIOC_SETOPTIONS:
|
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{
|
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int options, retval = -EINVAL;
|
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|
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if (get_user(options, p))
|
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return -EFAULT;
|
||||
if (options & WDIOS_DISABLECARD) {
|
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sch311x_wdt_stop();
|
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retval = 0;
|
||||
}
|
||||
if (options & WDIOS_ENABLECARD) {
|
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sch311x_wdt_start();
|
||||
retval = 0;
|
||||
}
|
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return retval;
|
||||
}
|
||||
case WDIOC_KEEPALIVE:
|
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sch311x_wdt_keepalive();
|
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break;
|
||||
|
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case WDIOC_SETTIMEOUT:
|
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if (get_user(new_timeout, p))
|
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return -EFAULT;
|
||||
if (sch311x_wdt_set_heartbeat(new_timeout))
|
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return -EINVAL;
|
||||
sch311x_wdt_keepalive();
|
||||
/* Fall */
|
||||
case WDIOC_GETTIMEOUT:
|
||||
return put_user(timeout, p);
|
||||
default:
|
||||
return -ENOTTY;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int sch311x_wdt_open(struct inode *inode, struct file *file)
|
||||
{
|
||||
if (test_and_set_bit(0, &sch311x_wdt_is_open))
|
||||
return -EBUSY;
|
||||
/*
|
||||
* Activate
|
||||
*/
|
||||
sch311x_wdt_start();
|
||||
return nonseekable_open(inode, file);
|
||||
}
|
||||
|
||||
static int sch311x_wdt_close(struct inode *inode, struct file *file)
|
||||
{
|
||||
if (sch311x_wdt_expect_close == 42) {
|
||||
sch311x_wdt_stop();
|
||||
} else {
|
||||
printk(KERN_CRIT PFX
|
||||
"Unexpected close, not stopping watchdog!\n");
|
||||
sch311x_wdt_keepalive();
|
||||
}
|
||||
clear_bit(0, &sch311x_wdt_is_open);
|
||||
sch311x_wdt_expect_close = 0;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Kernel Interfaces
|
||||
*/
|
||||
|
||||
static const struct file_operations sch311x_wdt_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.llseek = no_llseek,
|
||||
.write = sch311x_wdt_write,
|
||||
.unlocked_ioctl = sch311x_wdt_ioctl,
|
||||
.open = sch311x_wdt_open,
|
||||
.release = sch311x_wdt_close,
|
||||
};
|
||||
|
||||
static struct miscdevice sch311x_wdt_miscdev = {
|
||||
.minor = WATCHDOG_MINOR,
|
||||
.name = "watchdog",
|
||||
.fops = &sch311x_wdt_fops,
|
||||
};
|
||||
|
||||
/*
|
||||
* Init & exit routines
|
||||
*/
|
||||
|
||||
static int __devinit sch311x_wdt_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct device *dev = &pdev->dev;
|
||||
unsigned char val;
|
||||
int err;
|
||||
|
||||
spin_lock_init(&sch311x_wdt_data.io_lock);
|
||||
|
||||
if (!request_region(sch311x_wdt_data.runtime_reg + RESGEN, 1,
|
||||
DRV_NAME)) {
|
||||
dev_err(dev, "Failed to request region 0x%04x-0x%04x.\n",
|
||||
sch311x_wdt_data.runtime_reg + RESGEN,
|
||||
sch311x_wdt_data.runtime_reg + RESGEN);
|
||||
err = -EBUSY;
|
||||
goto exit;
|
||||
}
|
||||
|
||||
if (!request_region(sch311x_wdt_data.runtime_reg + GP60, 1, DRV_NAME)) {
|
||||
dev_err(dev, "Failed to request region 0x%04x-0x%04x.\n",
|
||||
sch311x_wdt_data.runtime_reg + GP60,
|
||||
sch311x_wdt_data.runtime_reg + GP60);
|
||||
err = -EBUSY;
|
||||
goto exit_release_region;
|
||||
}
|
||||
|
||||
if (!request_region(sch311x_wdt_data.runtime_reg + WDT_TIME_OUT, 4,
|
||||
DRV_NAME)) {
|
||||
dev_err(dev, "Failed to request region 0x%04x-0x%04x.\n",
|
||||
sch311x_wdt_data.runtime_reg + WDT_TIME_OUT,
|
||||
sch311x_wdt_data.runtime_reg + WDT_CTRL);
|
||||
err = -EBUSY;
|
||||
goto exit_release_region2;
|
||||
}
|
||||
|
||||
/* Make sure that the watchdog is not running */
|
||||
sch311x_wdt_stop();
|
||||
|
||||
/* Disable keyboard and mouse interaction and interrupt */
|
||||
/* -- Watchdog timer configuration --
|
||||
* Bit 0 Reserved
|
||||
* Bit 1 Keyboard enable: 0* = No Reset, 1 = Reset WDT upon KBD Intr.
|
||||
* Bit 2 Mouse enable: 0* = No Reset, 1 = Reset WDT upon Mouse Intr
|
||||
* Bit 3 Reserved
|
||||
* Bit 4-7 WDT Interrupt Mapping: (0000* = Disabled,
|
||||
* 0001=IRQ1, 0010=(Invalid), 0011=IRQ3 to 1111=IRQ15)
|
||||
*/
|
||||
outb(0, sch311x_wdt_data.runtime_reg + WDT_CFG);
|
||||
|
||||
/* Check that the heartbeat value is within it's range ;
|
||||
* if not reset to the default */
|
||||
if (sch311x_wdt_set_heartbeat(timeout)) {
|
||||
sch311x_wdt_set_heartbeat(WATCHDOG_TIMEOUT);
|
||||
dev_info(dev, "timeout value must be 1<=x<=15300, using %d\n",
|
||||
timeout);
|
||||
}
|
||||
|
||||
/* Get status at boot */
|
||||
sch311x_wdt_get_status(&sch311x_wdt_data.boot_status);
|
||||
|
||||
/* enable watchdog */
|
||||
/* -- Reset Generator --
|
||||
* Bit 0 Enable Watchdog Timer Generation: 0* = Enabled, 1 = Disabled
|
||||
* Bit 1 Thermtrip Source Select: O* = No Source, 1 = Source
|
||||
* Bit 2 WDT2_CTL: WDT input bit
|
||||
* Bit 3-7 Reserved
|
||||
*/
|
||||
outb(0, sch311x_wdt_data.runtime_reg + RESGEN);
|
||||
val = therm_trip ? 0x06 : 0x04;
|
||||
outb(val, sch311x_wdt_data.runtime_reg + RESGEN);
|
||||
|
||||
err = misc_register(&sch311x_wdt_miscdev);
|
||||
if (err != 0) {
|
||||
dev_err(dev, "cannot register miscdev on minor=%d (err=%d)\n",
|
||||
WATCHDOG_MINOR, err);
|
||||
goto exit_release_region3;
|
||||
}
|
||||
|
||||
sch311x_wdt_miscdev.parent = dev;
|
||||
|
||||
dev_info(dev,
|
||||
"SMSC SCH311x WDT initialized. timeout=%d sec (nowayout=%d)\n",
|
||||
timeout, nowayout);
|
||||
|
||||
return 0;
|
||||
|
||||
exit_release_region3:
|
||||
release_region(sch311x_wdt_data.runtime_reg + WDT_TIME_OUT, 4);
|
||||
exit_release_region2:
|
||||
release_region(sch311x_wdt_data.runtime_reg + GP60, 1);
|
||||
exit_release_region:
|
||||
release_region(sch311x_wdt_data.runtime_reg + RESGEN, 1);
|
||||
sch311x_wdt_data.runtime_reg = 0;
|
||||
exit:
|
||||
return err;
|
||||
}
|
||||
|
||||
static int __devexit sch311x_wdt_remove(struct platform_device *pdev)
|
||||
{
|
||||
/* Stop the timer before we leave */
|
||||
if (!nowayout)
|
||||
sch311x_wdt_stop();
|
||||
|
||||
/* Deregister */
|
||||
misc_deregister(&sch311x_wdt_miscdev);
|
||||
release_region(sch311x_wdt_data.runtime_reg + WDT_TIME_OUT, 4);
|
||||
release_region(sch311x_wdt_data.runtime_reg + GP60, 1);
|
||||
release_region(sch311x_wdt_data.runtime_reg + RESGEN, 1);
|
||||
sch311x_wdt_data.runtime_reg = 0;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void sch311x_wdt_shutdown(struct platform_device *dev)
|
||||
{
|
||||
/* Turn the WDT off if we have a soft shutdown */
|
||||
sch311x_wdt_stop();
|
||||
}
|
||||
|
||||
#define sch311x_wdt_suspend NULL
|
||||
#define sch311x_wdt_resume NULL
|
||||
|
||||
static struct platform_driver sch311x_wdt_driver = {
|
||||
.probe = sch311x_wdt_probe,
|
||||
.remove = __devexit_p(sch311x_wdt_remove),
|
||||
.shutdown = sch311x_wdt_shutdown,
|
||||
.suspend = sch311x_wdt_suspend,
|
||||
.resume = sch311x_wdt_resume,
|
||||
.driver = {
|
||||
.owner = THIS_MODULE,
|
||||
.name = DRV_NAME,
|
||||
},
|
||||
};
|
||||
|
||||
static int __init sch311x_detect(int sio_config_port, unsigned short *addr)
|
||||
{
|
||||
int err = 0, reg;
|
||||
unsigned short base_addr;
|
||||
unsigned char dev_id;
|
||||
|
||||
sch311x_sio_enter(sio_config_port);
|
||||
|
||||
/* Check device ID. We currently know about:
|
||||
* SCH3112 (0x7c), SCH3114 (0x7d), and SCH3116 (0x7f). */
|
||||
reg = force_id ? force_id : sch311x_sio_inb(sio_config_port, 0x20);
|
||||
if (!(reg == 0x7c || reg == 0x7d || reg == 0x7f)) {
|
||||
err = -ENODEV;
|
||||
goto exit;
|
||||
}
|
||||
dev_id = reg == 0x7c ? 2 : reg == 0x7d ? 4 : 6;
|
||||
|
||||
/* Select logical device A (runtime registers) */
|
||||
sch311x_sio_outb(sio_config_port, 0x07, 0x0a);
|
||||
|
||||
/* Check if Logical Device Register is currently active */
|
||||
if (sch311x_sio_inb(sio_config_port, 0x30) && 0x01 == 0)
|
||||
printk(KERN_INFO PFX "Seems that LDN 0x0a is not active...\n");
|
||||
|
||||
/* Get the base address of the runtime registers */
|
||||
base_addr = (sch311x_sio_inb(sio_config_port, 0x60) << 8) |
|
||||
sch311x_sio_inb(sio_config_port, 0x61);
|
||||
if (!base_addr) {
|
||||
printk(KERN_ERR PFX "Base address not set.\n");
|
||||
err = -ENODEV;
|
||||
goto exit;
|
||||
}
|
||||
*addr = base_addr;
|
||||
|
||||
printk(KERN_INFO PFX "Found an SMSC SCH311%d chip at 0x%04x\n",
|
||||
dev_id, base_addr);
|
||||
|
||||
exit:
|
||||
sch311x_sio_exit(sio_config_port);
|
||||
return err;
|
||||
}
|
||||
|
||||
static int __init sch311x_wdt_init(void)
|
||||
{
|
||||
int err, i, found = 0;
|
||||
unsigned short addr = 0;
|
||||
|
||||
for (i = 0; !found && sch311x_ioports[i]; i++)
|
||||
if (sch311x_detect(sch311x_ioports[i], &addr) == 0)
|
||||
found++;
|
||||
|
||||
if (!found)
|
||||
return -ENODEV;
|
||||
|
||||
sch311x_wdt_data.runtime_reg = addr;
|
||||
|
||||
err = platform_driver_register(&sch311x_wdt_driver);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
sch311x_wdt_pdev = platform_device_register_simple(DRV_NAME, addr,
|
||||
NULL, 0);
|
||||
|
||||
if (IS_ERR(sch311x_wdt_pdev)) {
|
||||
err = PTR_ERR(sch311x_wdt_pdev);
|
||||
goto unreg_platform_driver;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
unreg_platform_driver:
|
||||
platform_driver_unregister(&sch311x_wdt_driver);
|
||||
return err;
|
||||
}
|
||||
|
||||
static void __exit sch311x_wdt_exit(void)
|
||||
{
|
||||
platform_device_unregister(sch311x_wdt_pdev);
|
||||
platform_driver_unregister(&sch311x_wdt_driver);
|
||||
}
|
||||
|
||||
module_init(sch311x_wdt_init);
|
||||
module_exit(sch311x_wdt_exit);
|
||||
|
||||
MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
|
||||
MODULE_DESCRIPTION("SMSC SCH311x WatchDog Timer Driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
|
||||
|
||||
|
|
@ -0,0 +1,329 @@
|
|||
/*
|
||||
* Watchdog driver for the wm8350
|
||||
*
|
||||
* Copyright (C) 2007, 2008 Wolfson Microelectronics <linux@wolfsonmicro.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU General Public License
|
||||
* as published by the Free Software Foundation
|
||||
*/
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/moduleparam.h>
|
||||
#include <linux/types.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/fs.h>
|
||||
#include <linux/miscdevice.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/watchdog.h>
|
||||
#include <linux/uaccess.h>
|
||||
#include <linux/mfd/wm8350/core.h>
|
||||
|
||||
static int nowayout = WATCHDOG_NOWAYOUT;
|
||||
module_param(nowayout, int, 0);
|
||||
MODULE_PARM_DESC(nowayout,
|
||||
"Watchdog cannot be stopped once started (default="
|
||||
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
|
||||
|
||||
static unsigned long wm8350_wdt_users;
|
||||
static struct miscdevice wm8350_wdt_miscdev;
|
||||
static int wm8350_wdt_expect_close;
|
||||
static DEFINE_MUTEX(wdt_mutex);
|
||||
|
||||
static struct {
|
||||
int time; /* Seconds */
|
||||
u16 val; /* To be set in WM8350_SYSTEM_CONTROL_2 */
|
||||
} wm8350_wdt_cfgs[] = {
|
||||
{ 1, 0x02 },
|
||||
{ 2, 0x04 },
|
||||
{ 4, 0x05 },
|
||||
};
|
||||
|
||||
static struct wm8350 *get_wm8350(void)
|
||||
{
|
||||
return dev_get_drvdata(wm8350_wdt_miscdev.parent);
|
||||
}
|
||||
|
||||
static int wm8350_wdt_set_timeout(struct wm8350 *wm8350, u16 value)
|
||||
{
|
||||
int ret;
|
||||
u16 reg;
|
||||
|
||||
mutex_lock(&wdt_mutex);
|
||||
wm8350_reg_unlock(wm8350);
|
||||
|
||||
reg = wm8350_reg_read(wm8350, WM8350_SYSTEM_CONTROL_2);
|
||||
reg &= ~WM8350_WDOG_TO_MASK;
|
||||
reg |= value;
|
||||
ret = wm8350_reg_write(wm8350, WM8350_SYSTEM_CONTROL_2, reg);
|
||||
|
||||
wm8350_reg_lock(wm8350);
|
||||
mutex_unlock(&wdt_mutex);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int wm8350_wdt_start(struct wm8350 *wm8350)
|
||||
{
|
||||
int ret;
|
||||
u16 reg;
|
||||
|
||||
mutex_lock(&wdt_mutex);
|
||||
wm8350_reg_unlock(wm8350);
|
||||
|
||||
reg = wm8350_reg_read(wm8350, WM8350_SYSTEM_CONTROL_2);
|
||||
reg &= ~WM8350_WDOG_MODE_MASK;
|
||||
reg |= 0x20;
|
||||
ret = wm8350_reg_write(wm8350, WM8350_SYSTEM_CONTROL_2, reg);
|
||||
|
||||
wm8350_reg_lock(wm8350);
|
||||
mutex_unlock(&wdt_mutex);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int wm8350_wdt_stop(struct wm8350 *wm8350)
|
||||
{
|
||||
int ret;
|
||||
u16 reg;
|
||||
|
||||
mutex_lock(&wdt_mutex);
|
||||
wm8350_reg_unlock(wm8350);
|
||||
|
||||
reg = wm8350_reg_read(wm8350, WM8350_SYSTEM_CONTROL_2);
|
||||
reg &= ~WM8350_WDOG_MODE_MASK;
|
||||
ret = wm8350_reg_write(wm8350, WM8350_SYSTEM_CONTROL_2, reg);
|
||||
|
||||
wm8350_reg_lock(wm8350);
|
||||
mutex_unlock(&wdt_mutex);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int wm8350_wdt_kick(struct wm8350 *wm8350)
|
||||
{
|
||||
int ret;
|
||||
u16 reg;
|
||||
|
||||
mutex_lock(&wdt_mutex);
|
||||
|
||||
reg = wm8350_reg_read(wm8350, WM8350_SYSTEM_CONTROL_2);
|
||||
ret = wm8350_reg_write(wm8350, WM8350_SYSTEM_CONTROL_2, reg);
|
||||
|
||||
mutex_unlock(&wdt_mutex);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int wm8350_wdt_open(struct inode *inode, struct file *file)
|
||||
{
|
||||
struct wm8350 *wm8350 = get_wm8350();
|
||||
int ret;
|
||||
|
||||
if (!wm8350)
|
||||
return -ENODEV;
|
||||
|
||||
if (test_and_set_bit(0, &wm8350_wdt_users))
|
||||
return -EBUSY;
|
||||
|
||||
ret = wm8350_wdt_start(wm8350);
|
||||
if (ret != 0)
|
||||
return ret;
|
||||
|
||||
return nonseekable_open(inode, file);
|
||||
}
|
||||
|
||||
static int wm8350_wdt_release(struct inode *inode, struct file *file)
|
||||
{
|
||||
struct wm8350 *wm8350 = get_wm8350();
|
||||
|
||||
if (wm8350_wdt_expect_close)
|
||||
wm8350_wdt_stop(wm8350);
|
||||
else {
|
||||
dev_warn(wm8350->dev, "Watchdog device closed uncleanly\n");
|
||||
wm8350_wdt_kick(wm8350);
|
||||
}
|
||||
|
||||
clear_bit(0, &wm8350_wdt_users);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static ssize_t wm8350_wdt_write(struct file *file,
|
||||
const char __user *data, size_t count,
|
||||
loff_t *ppos)
|
||||
{
|
||||
struct wm8350 *wm8350 = get_wm8350();
|
||||
size_t i;
|
||||
|
||||
if (count) {
|
||||
wm8350_wdt_kick(wm8350);
|
||||
|
||||
if (!nowayout) {
|
||||
/* In case it was set long ago */
|
||||
wm8350_wdt_expect_close = 0;
|
||||
|
||||
/* scan to see whether or not we got the magic
|
||||
character */
|
||||
for (i = 0; i != count; i++) {
|
||||
char c;
|
||||
if (get_user(c, data + i))
|
||||
return -EFAULT;
|
||||
if (c == 'V')
|
||||
wm8350_wdt_expect_close = 42;
|
||||
}
|
||||
}
|
||||
}
|
||||
return count;
|
||||
}
|
||||
|
||||
static struct watchdog_info ident = {
|
||||
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
|
||||
.identity = "WM8350 Watchdog",
|
||||
};
|
||||
|
||||
static long wm8350_wdt_ioctl(struct file *file, unsigned int cmd,
|
||||
unsigned long arg)
|
||||
{
|
||||
struct wm8350 *wm8350 = get_wm8350();
|
||||
int ret = -ENOTTY, time, i;
|
||||
void __user *argp = (void __user *)arg;
|
||||
int __user *p = argp;
|
||||
u16 reg;
|
||||
|
||||
switch (cmd) {
|
||||
case WDIOC_GETSUPPORT:
|
||||
ret = copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
|
||||
break;
|
||||
|
||||
case WDIOC_GETSTATUS:
|
||||
case WDIOC_GETBOOTSTATUS:
|
||||
ret = put_user(0, p);
|
||||
break;
|
||||
|
||||
case WDIOC_SETOPTIONS:
|
||||
{
|
||||
int options;
|
||||
|
||||
if (get_user(options, p))
|
||||
return -EFAULT;
|
||||
|
||||
ret = -EINVAL;
|
||||
|
||||
/* Setting both simultaneously means at least one must fail */
|
||||
if (options == WDIOS_DISABLECARD)
|
||||
ret = wm8350_wdt_start(wm8350);
|
||||
|
||||
if (options == WDIOS_ENABLECARD)
|
||||
ret = wm8350_wdt_stop(wm8350);
|
||||
break;
|
||||
}
|
||||
|
||||
case WDIOC_KEEPALIVE:
|
||||
ret = wm8350_wdt_kick(wm8350);
|
||||
break;
|
||||
|
||||
case WDIOC_SETTIMEOUT:
|
||||
ret = get_user(time, p);
|
||||
if (ret)
|
||||
break;
|
||||
|
||||
if (time == 0) {
|
||||
if (nowayout)
|
||||
ret = -EINVAL;
|
||||
else
|
||||
wm8350_wdt_stop(wm8350);
|
||||
break;
|
||||
}
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(wm8350_wdt_cfgs); i++)
|
||||
if (wm8350_wdt_cfgs[i].time == time)
|
||||
break;
|
||||
if (i == ARRAY_SIZE(wm8350_wdt_cfgs))
|
||||
ret = -EINVAL;
|
||||
else
|
||||
ret = wm8350_wdt_set_timeout(wm8350,
|
||||
wm8350_wdt_cfgs[i].val);
|
||||
break;
|
||||
|
||||
case WDIOC_GETTIMEOUT:
|
||||
reg = wm8350_reg_read(wm8350, WM8350_SYSTEM_CONTROL_2);
|
||||
reg &= WM8350_WDOG_TO_MASK;
|
||||
for (i = 0; i < ARRAY_SIZE(wm8350_wdt_cfgs); i++)
|
||||
if (wm8350_wdt_cfgs[i].val == reg)
|
||||
break;
|
||||
if (i == ARRAY_SIZE(wm8350_wdt_cfgs)) {
|
||||
dev_warn(wm8350->dev,
|
||||
"Unknown watchdog configuration: %x\n", reg);
|
||||
ret = -EINVAL;
|
||||
} else
|
||||
ret = put_user(wm8350_wdt_cfgs[i].time, p);
|
||||
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static const struct file_operations wm8350_wdt_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.llseek = no_llseek,
|
||||
.write = wm8350_wdt_write,
|
||||
.unlocked_ioctl = wm8350_wdt_ioctl,
|
||||
.open = wm8350_wdt_open,
|
||||
.release = wm8350_wdt_release,
|
||||
};
|
||||
|
||||
static struct miscdevice wm8350_wdt_miscdev = {
|
||||
.minor = WATCHDOG_MINOR,
|
||||
.name = "watchdog",
|
||||
.fops = &wm8350_wdt_fops,
|
||||
};
|
||||
|
||||
static int wm8350_wdt_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct wm8350 *wm8350 = platform_get_drvdata(pdev);
|
||||
|
||||
if (!wm8350) {
|
||||
dev_err(wm8350->dev, "No driver data supplied\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
/* Default to 4s timeout */
|
||||
wm8350_wdt_set_timeout(wm8350, 0x05);
|
||||
|
||||
wm8350_wdt_miscdev.parent = &pdev->dev;
|
||||
|
||||
return misc_register(&wm8350_wdt_miscdev);
|
||||
}
|
||||
|
||||
static int __exit wm8350_wdt_remove(struct platform_device *pdev)
|
||||
{
|
||||
misc_deregister(&wm8350_wdt_miscdev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct platform_driver wm8350_wdt_driver = {
|
||||
.probe = wm8350_wdt_probe,
|
||||
.remove = wm8350_wdt_remove,
|
||||
.driver = {
|
||||
.name = "wm8350-wdt",
|
||||
},
|
||||
};
|
||||
|
||||
static int __init wm8350_wdt_init(void)
|
||||
{
|
||||
return platform_driver_register(&wm8350_wdt_driver);
|
||||
}
|
||||
module_init(wm8350_wdt_init);
|
||||
|
||||
static void __exit wm8350_wdt_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&wm8350_wdt_driver);
|
||||
}
|
||||
module_exit(wm8350_wdt_exit);
|
||||
|
||||
MODULE_AUTHOR("Mark Brown");
|
||||
MODULE_DESCRIPTION("WM8350 Watchdog");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS("platform:wm8350-wdt");
|
||||
Reference in New Issue