diff options
| -rw-r--r-- | drivers/char/watchdog/Kconfig | 32 | ||||
| -rw-r--r-- | drivers/char/watchdog/Makefile | 4 | ||||
| -rw-r--r-- | drivers/char/watchdog/iTCO_vendor_support.c | 307 | ||||
| -rw-r--r-- | drivers/char/watchdog/iTCO_wdt.c | 29 | ||||
| -rw-r--r-- | drivers/char/watchdog/pc87413_wdt.c | 635 | ||||
| -rw-r--r-- | drivers/char/watchdog/rm9k_wdt.c | 420 |
6 files changed, 1423 insertions, 4 deletions
diff --git a/drivers/char/watchdog/Kconfig b/drivers/char/watchdog/Kconfig index 0187b1185323..ea09d0c974ea 100644 --- a/drivers/char/watchdog/Kconfig +++ b/drivers/char/watchdog/Kconfig @@ -340,6 +340,14 @@ config ITCO_WDT To compile this driver as a module, choose M here: the module will be called iTCO_wdt. +config ITCO_VENDOR_SUPPORT + bool "Intel TCO Timer/Watchdog Specific Vendor Support" + depends on ITCO_WDT + ---help--- + Add vendor specific support to the intel TCO timer based watchdog + devices. At this moment we only have additional support for some + SuperMicro Inc. motherboards. + config SC1200_WDT tristate "National Semiconductor PC87307/PC97307 (ala SC1200) Watchdog" depends on WATCHDOG && X86 @@ -363,6 +371,20 @@ config SCx200_WDT If compiled as a module, it will be called scx200_wdt. +config PC87413_WDT + tristate "NS PC87413 watchdog" + depends on WATCHDOG && X86 + ---help--- + This is the driver for the hardware watchdog on the PC87413 chipset + This watchdog simply watches your kernel to make sure it doesn't + freeze, and if it does, it reboots your computer after a certain + amount of time. + + To compile this driver as a module, choose M here: the + module will be called pc87413_wdt. + + Most people will say N. + config 60XX_WDT tristate "SBC-60XX Watchdog Timer" depends on WATCHDOG && X86 @@ -553,6 +575,16 @@ config INDYDOG timer expired and no process has written to /dev/watchdog during that time. +config WDT_RM9K_GPI + tristate "RM9000/GPI hardware watchdog" + depends on WATCHDOG && CPU_RM9000 + help + Watchdog implementation using the GPI hardware found on + PMC-Sierra RM9xxx CPUs. + + To compile this driver as a module, choose M here: the + module will be called rm9k_wdt. + # S390 Architecture config ZVM_WATCHDOG diff --git a/drivers/char/watchdog/Makefile b/drivers/char/watchdog/Makefile index 36440497047c..2cd8ff8d10ac 100644 --- a/drivers/char/watchdog/Makefile +++ b/drivers/char/watchdog/Makefile @@ -47,9 +47,10 @@ obj-$(CONFIG_IBMASR) += ibmasr.o obj-$(CONFIG_WAFER_WDT) += wafer5823wdt.o obj-$(CONFIG_I6300ESB_WDT) += i6300esb.o obj-$(CONFIG_I8XX_TCO) += i8xx_tco.o -obj-$(CONFIG_ITCO_WDT) += iTCO_wdt.o +obj-$(CONFIG_ITCO_WDT) += iTCO_wdt.o iTCO_vendor_support.o obj-$(CONFIG_SC1200_WDT) += sc1200wdt.o obj-$(CONFIG_SCx200_WDT) += scx200_wdt.o +obj-$(CONFIG_PC87413_WDT) += pc87413_wdt.o obj-$(CONFIG_60XX_WDT) += sbc60xxwdt.o obj-$(CONFIG_SBC8360_WDT) += sbc8360.o obj-$(CONFIG_CPU5_WDT) += cpu5wdt.o @@ -72,6 +73,7 @@ obj-$(CONFIG_WATCHDOG_RTAS) += wdrtas.o # MIPS Architecture obj-$(CONFIG_INDYDOG) += indydog.o +obj-$(CONFIG_WDT_RM9K_GPI) += rm9k_wdt.o # S390 Architecture diff --git a/drivers/char/watchdog/iTCO_vendor_support.c b/drivers/char/watchdog/iTCO_vendor_support.c new file mode 100644 index 000000000000..415083990097 --- /dev/null +++ b/drivers/char/watchdog/iTCO_vendor_support.c @@ -0,0 +1,307 @@ +/* + * intel TCO vendor specific watchdog driver support + * + * (c) Copyright 2006 Wim Van Sebroeck <wim@iguana.be>. + * + * 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; either version + * 2 of the License, or (at your option) any later version. + * + * Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor + * provide warranty for any of this software. This material is + * provided "AS-IS" and at no charge. + */ + +/* + * Includes, defines, variables, module parameters, ... + */ + +/* Module and version information */ +#define DRV_NAME "iTCO_vendor_support" +#define DRV_VERSION "1.01" +#define DRV_RELDATE "11-Nov-2006" +#define PFX DRV_NAME ": " + +/* Includes */ +#include <linux/module.h> /* For module specific items */ +#include <linux/moduleparam.h> /* For new moduleparam's */ +#include <linux/types.h> /* For standard types (like size_t) */ +#include <linux/errno.h> /* For the -ENODEV/... values */ +#include <linux/kernel.h> /* For printk/panic/... */ +#include <linux/init.h> /* For __init/__exit/... */ +#include <linux/ioport.h> /* For io-port access */ + +#include <asm/io.h> /* For inb/outb/... */ + +/* iTCO defines */ +#define SMI_EN acpibase + 0x30 /* SMI Control and Enable Register */ +#define TCOBASE acpibase + 0x60 /* TCO base address */ +#define TCO1_STS TCOBASE + 0x04 /* TCO1 Status Register */ + +/* List of vendor support modes */ +#define SUPERMICRO_OLD_BOARD 1 /* SuperMicro Pentium 3 Era 370SSE+-OEM1/P3TSSE */ +#define SUPERMICRO_NEW_BOARD 2 /* SuperMicro Pentium 4 / Xeon 4 / EMT64T Era Systems */ + +static int vendorsupport = 0; +module_param(vendorsupport, int, 0); +MODULE_PARM_DESC(vendorsupport, "iTCO vendor specific support mode, default=0 (none), 1=SuperMicro Pent3, 2=SuperMicro Pent4+"); + +/* + * Vendor Specific Support + */ + +/* + * Vendor Support: 1 + * Board: Super Micro Computer Inc. 370SSE+-OEM1/P3TSSE + * iTCO chipset: ICH2 + * + * Code contributed by: R. Seretny <lkpatches@paypc.com> + * Documentation obtained by R. Seretny from SuperMicro Technical Support + * + * To enable Watchdog function: + * BIOS setup -> Power -> TCO Logic SMI Enable -> Within5Minutes + * This setting enables SMI to clear the watchdog expired flag. + * If BIOS or CPU fail which may cause SMI hang, then system will + * reboot. When application starts to use watchdog function, + * application has to take over the control from SMI. + * + * For P3TSSE, J36 jumper needs to be removed to enable the Watchdog + * function. + * + * Note: The system will reboot when Expire Flag is set TWICE. + * So, if the watchdog timer is 20 seconds, then the maximum hang + * time is about 40 seconds, and the minimum hang time is about + * 20.6 seconds. + */ + +static void supermicro_old_pre_start(unsigned long acpibase) +{ + unsigned long val32; + + val32 = inl(SMI_EN); + val32 &= 0xffffdfff; /* Turn off SMI clearing watchdog */ + outl(val32, SMI_EN); /* Needed to activate watchdog */ +} + +static void supermicro_old_pre_stop(unsigned long acpibase) +{ + unsigned long val32; + + val32 = inl(SMI_EN); + val32 &= 0x00002000; /* Turn on SMI clearing watchdog */ + outl(val32, SMI_EN); /* Needed to deactivate watchdog */ +} + +static void supermicro_old_pre_keepalive(unsigned long acpibase) +{ + /* Reload TCO Timer (done in iTCO_wdt_keepalive) + */ + /* Clear "Expire Flag" (Bit 3 of TC01_STS register) */ + outb(0x08, TCO1_STS); +} + +/* + * Vendor Support: 2 + * Board: Super Micro Computer Inc. P4SBx, P4DPx + * iTCO chipset: ICH4 + * + * Code contributed by: R. Seretny <lkpatches@paypc.com> + * Documentation obtained by R. Seretny from SuperMicro Technical Support + * + * To enable Watchdog function: + * 1. BIOS + * For P4SBx: + * BIOS setup -> Advanced -> Integrated Peripherals -> Watch Dog Feature + * For P4DPx: + * BIOS setup -> Advanced -> I/O Device Configuration -> Watch Dog + * This setting enables or disables Watchdog function. When enabled, the + * default watchdog timer is set to be 5 minutes (about 4’35”). It is + * enough to load and run the OS. The application (service or driver) has + * to take over the control once OS is running up and before watchdog + * expires. + * + * 2. JUMPER + * For P4SBx: JP39 + * For P4DPx: JP37 + * This jumper is used for safety. Closed is enabled. This jumper + * prevents user enables watchdog in BIOS by accident. + * + * To enable Watch Dog function, both BIOS and JUMPER must be enabled. + * + * The documentation lists motherboards P4SBx and P4DPx series as of + * 20-March-2002. However, this code works flawlessly with much newer + * motherboards, such as my X6DHR-8G2 (SuperServer 6014H-82). + * + * The original iTCO driver as written does not actually reset the + * watchdog timer on these machines, as a result they reboot after five + * minutes. + * + * NOTE: You may leave the Watchdog function disabled in the SuperMicro + * BIOS to avoid a "boot-race"... This driver will enable watchdog + * functionality even if it's disabled in the BIOS once the /dev/watchdog + * file is opened. + */ + +/* I/O Port's */ +#define SM_REGINDEX 0x2e /* SuperMicro ICH4+ Register Index */ +#define SM_DATAIO 0x2f /* SuperMicro ICH4+ Register Data I/O */ + +/* Control Register's */ +#define SM_CTLPAGESW 0x07 /* SuperMicro ICH4+ Control Page Switch */ +#define SM_CTLPAGE 0x08 /* SuperMicro ICH4+ Control Page Num */ + +#define SM_WATCHENABLE 0x30 /* Watchdog enable: Bit 0: 0=off, 1=on */ + +#define SM_WATCHPAGE 0x87 /* Watchdog unlock control page */ + +#define SM_ENDWATCH 0xAA /* Watchdog lock control page */ + +#define SM_COUNTMODE 0xf5 /* Watchdog count mode select */ + /* (Bit 3: 0 = seconds, 1 = minutes */ + +#define SM_WATCHTIMER 0xf6 /* 8-bits, Watchdog timer counter (RW) */ + +#define SM_RESETCONTROL 0xf7 /* Watchdog reset control */ + /* Bit 6: timer is reset by kbd interrupt */ + /* Bit 7: timer is reset by mouse interrupt */ + +static void supermicro_new_unlock_watchdog(void) +{ + outb(SM_WATCHPAGE, SM_REGINDEX); /* Write 0x87 to port 0x2e twice */ + outb(SM_WATCHPAGE, SM_REGINDEX); + + outb(SM_CTLPAGESW, SM_REGINDEX); /* Switch to watchdog control page */ + outb(SM_CTLPAGE, SM_DATAIO); +} + +static void supermicro_new_lock_watchdog(void) +{ + outb(SM_ENDWATCH, SM_REGINDEX); +} + +static void supermicro_new_pre_start(unsigned int heartbeat) +{ + unsigned int val; + + supermicro_new_unlock_watchdog(); + + /* Watchdog timer setting needs to be in seconds*/ + outb(SM_COUNTMODE, SM_REGINDEX); + val = inb(SM_DATAIO); + val &= 0xF7; + outb(val, SM_DATAIO); + + /* Write heartbeat interval to WDOG */ + outb (SM_WATCHTIMER, SM_REGINDEX); + outb((heartbeat & 255), SM_DATAIO); + + /* Make sure keyboard/mouse interrupts don't interfere */ + outb(SM_RESETCONTROL, SM_REGINDEX); + val = inb(SM_DATAIO); + val &= 0x3f; + outb(val, SM_DATAIO); + + /* enable watchdog by setting bit 0 of Watchdog Enable to 1 */ + outb(SM_WATCHENABLE, SM_REGINDEX); + val = inb(SM_DATAIO); + val |= 0x01; + outb(val, SM_DATAIO); + + supermicro_new_lock_watchdog(); +} + +static void supermicro_new_pre_stop(void) +{ + unsigned int val; + + supermicro_new_unlock_watchdog(); + + /* disable watchdog by setting bit 0 of Watchdog Enable to 0 */ + outb(SM_WATCHENABLE, SM_REGINDEX); + val = inb(SM_DATAIO); + val &= 0xFE; + outb(val, SM_DATAIO); + + supermicro_new_lock_watchdog(); +} + +static void supermicro_new_pre_set_heartbeat(unsigned int heartbeat) +{ + supermicro_new_unlock_watchdog(); + + /* reset watchdog timeout to heartveat value */ + outb(SM_WATCHTIMER, SM_REGINDEX); + outb((heartbeat & 255), SM_DATAIO); + + supermicro_new_lock_watchdog(); +} + +/* + * Generic Support Functions + */ + +void iTCO_vendor_pre_start(unsigned long acpibase, + unsigned int heartbeat) +{ + if (vendorsupport == SUPERMICRO_OLD_BOARD) + supermicro_old_pre_start(acpibase); + else if (vendorsupport == SUPERMICRO_NEW_BOARD) + supermicro_new_pre_start(heartbeat); +} +EXPORT_SYMBOL(iTCO_vendor_pre_start); + +void iTCO_vendor_pre_stop(unsigned long acpibase) +{ + if (vendorsupport == SUPERMICRO_OLD_BOARD) + supermicro_old_pre_stop(acpibase); + else if (vendorsupport == SUPERMICRO_NEW_BOARD) + supermicro_new_pre_stop(); +} +EXPORT_SYMBOL(iTCO_vendor_pre_stop); + +void iTCO_vendor_pre_keepalive(unsigned long acpibase, unsigned int heartbeat) +{ + if (vendorsupport == SUPERMICRO_OLD_BOARD) + supermicro_old_pre_keepalive(acpibase); + else if (vendorsupport == SUPERMICRO_NEW_BOARD) + supermicro_new_pre_set_heartbeat(heartbeat); +} +EXPORT_SYMBOL(iTCO_vendor_pre_keepalive); + +void iTCO_vendor_pre_set_heartbeat(unsigned int heartbeat) +{ + if (vendorsupport == SUPERMICRO_NEW_BOARD) + supermicro_new_pre_set_heartbeat(heartbeat); +} +EXPORT_SYMBOL(iTCO_vendor_pre_set_heartbeat); + +int iTCO_vendor_check_noreboot_on(void) +{ + switch(vendorsupport) { + case SUPERMICRO_OLD_BOARD: + return 0; + default: + return 1; + } +} +EXPORT_SYMBOL(iTCO_vendor_check_noreboot_on); + +static int __init iTCO_vendor_init_module(void) +{ + printk (KERN_INFO PFX "vendor-support=%d\n", vendorsupport); + return 0; +} + +static void __exit iTCO_vendor_exit_module(void) +{ + printk (KERN_INFO PFX "Module Unloaded\n"); +} + +module_init(iTCO_vendor_init_module); +module_exit(iTCO_vendor_exit_module); + +MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>, R. Seretny <lkpatches@paypc.com>"); +MODULE_DESCRIPTION("Intel TCO Vendor Specific WatchDog Timer Driver Support"); +MODULE_VERSION(DRV_VERSION); +MODULE_LICENSE("GPL"); + diff --git a/drivers/char/watchdog/iTCO_wdt.c b/drivers/char/watchdog/iTCO_wdt.c index b6f29cb8bd39..7eac922df867 100644 --- a/drivers/char/watchdog/iTCO_wdt.c +++ b/drivers/char/watchdog/iTCO_wdt.c @@ -48,8 +48,8 @@ /* Module and version information */ #define DRV_NAME "iTCO_wdt" -#define DRV_VERSION "1.00" -#define DRV_RELDATE "08-Oct-2006" +#define DRV_VERSION "1.01" +#define DRV_RELDATE "11-Nov-2006" #define PFX DRV_NAME ": " /* Includes */ @@ -189,6 +189,21 @@ static int nowayout = WATCHDOG_NOWAYOUT; module_param(nowayout, int, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)"); +/* iTCO Vendor Specific Support hooks */ +#ifdef CONFIG_ITCO_VENDOR_SUPPORT +extern void iTCO_vendor_pre_start(unsigned long, unsigned int); +extern void iTCO_vendor_pre_stop(unsigned long); +extern void iTCO_vendor_pre_keepalive(unsigned long, unsigned int); +extern void iTCO_vendor_pre_set_heartbeat(unsigned int); +extern int iTCO_vendor_check_noreboot_on(void); +#else +#define iTCO_vendor_pre_start(acpibase, heartbeat) {} +#define iTCO_vendor_pre_stop(acpibase) {} +#define iTCO_vendor_pre_keepalive(acpibase,heartbeat) {} +#define iTCO_vendor_pre_set_heartbeat(heartbeat) {} +#define iTCO_vendor_check_noreboot_on() 1 /* 1=check noreboot; 0=don't check */ +#endif + /* * Some TCO specific functions */ @@ -249,6 +264,8 @@ static int iTCO_wdt_start(void) spin_lock(&iTCO_wdt_private.io_lock); + iTCO_vendor_pre_start(iTCO_wdt_private.ACPIBASE, heartbeat); + /* disable chipset's NO_REBOOT bit */ if (iTCO_wdt_unset_NO_REBOOT_bit()) { printk(KERN_ERR PFX "failed to reset NO_REBOOT flag, reboot disabled by hardware\n"); @@ -273,6 +290,8 @@ static int iTCO_wdt_stop(void) spin_lock(&iTCO_wdt_private.io_lock); + iTCO_vendor_pre_stop(iTCO_wdt_private.ACPIBASE); + /* Bit 11: TCO Timer Halt -> 1 = The TCO timer is disabled */ val = inw(TCO1_CNT); val |= 0x0800; @@ -293,6 +312,8 @@ static int iTCO_wdt_keepalive(void) { spin_lock(&iTCO_wdt_private.io_lock); + iTCO_vendor_pre_keepalive(iTCO_wdt_private.ACPIBASE, heartbeat); + /* Reload the timer by writing to the TCO Timer Counter register */ if (iTCO_wdt_private.iTCO_version == 2) { outw(0x01, TCO_RLD); @@ -319,6 +340,8 @@ static int iTCO_wdt_set_heartbeat(int t) ((iTCO_wdt_private.iTCO_version == 1) && (tmrval > 0x03f))) return -EINVAL; + iTCO_vendor_pre_set_heartbeat(tmrval); + /* Write new heartbeat to watchdog */ if (iTCO_wdt_private.iTCO_version == 2) { spin_lock(&iTCO_wdt_private.io_lock); @@ -569,7 +592,7 @@ static int iTCO_wdt_init(struct pci_dev *pdev, const struct pci_device_id *ent, } /* Check chipset's NO_REBOOT bit */ - if (iTCO_wdt_unset_NO_REBOOT_bit()) { + if (iTCO_wdt_unset_NO_REBOOT_bit() && iTCO_vendor_check_noreboot_on()) { printk(KERN_ERR PFX "failed to reset NO_REBOOT flag, reboot disabled by hardware\n"); ret = -ENODEV; /* Cannot reset NO_REBOOT bit */ goto out; diff --git a/drivers/char/watchdog/pc87413_wdt.c b/drivers/char/watchdog/pc87413_wdt.c new file mode 100644 index 000000000000..1d447e32af41 --- /dev/null +++ b/drivers/char/watchdog/pc87413_wdt.c @@ -0,0 +1,635 @@ +/* + * NS pc87413-wdt Watchdog Timer driver for Linux 2.6.x.x + * + * This code is based on wdt.c with original copyright. + * + * (C) Copyright 2006 Sven Anders, <anders@anduras.de> + * and Marcus Junker, <junker@anduras.de> + * + * 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; either version + * 2 of the License, or (at your option) any later version. + * + * Neither Sven Anders, Marcus Junker nor ANDURAS AG + * admit liability nor provide warranty for any of this software. + * This material is provided "AS-IS" and at no charge. + * + * Release 1.1 + */ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/miscdevice.h> +#include <linux/watchdog.h> +#include <linux/ioport.h> +#include <linux/delay.h> +#include <linux/notifier.h> +#include <linux/fs.h> +#include <linux/reboot.h> +#include <linux/init.h> +#include <linux/spinlock.h> +#include <linux/moduleparam.h> +#include <linux/version.h> + +#include <asm/io.h> +#include <asm/uaccess.h> +#include <asm/system.h> + +/* #define DEBUG 1 */ + +#define DEFAULT_TIMEOUT 1 /* 1 minute */ +#define MAX_TIMEOUT 255 + +#define VERSION "1.1" +#define MODNAME "pc87413 WDT" +#define PFX MODNAME ": " +#define DPFX MODNAME " - DEBUG: " + +#define WDT_INDEX_IO_PORT (io+0) /* I/O port base (index register) */ +#define WDT_DATA_IO_PORT (WDT_INDEX_IO_PORT+1) +#define SWC_LDN 0x04 +#define SIOCFG2 0x22 /* Serial IO register */ +#define WDCTL 0x10 /* Watchdog-Timer-Controll-Register */ +#define WDTO 0x11 /* Watchdog timeout register */ +#define WDCFG 0x12 /* Watchdog config register */ + +static int io = 0x2E; /* Address used on Portwell Boards */ + +static int timeout = DEFAULT_TIMEOUT; /* timeout value */ +static unsigned long timer_enabled = 0; /* is the timer enabled? */ + +static char expect_close; /* is the close expected? */ + +static spinlock_t io_lock; /* to guard the watchdog from io races */ + +static int nowayout = WATCHDOG_NOWAYOUT; + +/* -- Low level function ----------------------------------------*/ + +/* Select pins for Watchdog output */ + +static inline void pc87413_select_wdt_out (void) +{ + unsigned int cr_data = 0; + + /* Step 1: Select multiple pin,pin55,as WDT output */ + + outb_p(SIOCFG2, WDT_INDEX_IO_PORT); + + cr_data = inb (WDT_DATA_IO_PORT); + + cr_data |= 0x80; /* Set Bit7 to 1*/ + outb_p(SIOCFG2, WDT_INDEX_IO_PORT); + + outb_p(cr_data, WDT_DATA_IO_PORT); + +#ifdef DEBUG + printk(KERN_INFO DPFX "Select multiple pin,pin55,as WDT output:" + " Bit7 to 1: %d\n", cr_data); +#endif +} + +/* Enable SWC functions */ + +static inline void pc87413_enable_swc(void) +{ + unsigned int cr_data=0; + + /* Step 2: Enable SWC functions */ + + outb_p(0x07, WDT_INDEX_IO_PORT); /* Point SWC_LDN (LDN=4) */ + outb_p(SWC_LDN, WDT_DATA_IO_PORT); + + outb_p(0x30, WDT_INDEX_IO_PORT); /* Read Index 0x30 First */ + cr_data = inb(WDT_DATA_IO_PORT); + cr_data |= 0x01; /* Set Bit0 to 1 */ + outb_p(0x30, WDT_INDEX_IO_PORT); + outb_p(cr_data, WDT_DATA_IO_PORT); /* Index0x30_bit0P1 */ + +#ifdef DEBUG + printk(KERN_INFO DPFX "pc87413 - Enable SWC functions\n"); +#endif +} + +/* Read SWC I/O base address */ + +static inline unsigned int pc87413_get_swc_base(void) +{ + unsigned int swc_base_addr = 0; + unsigned char addr_l, addr_h = 0; + + /* Step 3: Read SWC I/O Base Address */ + + outb_p(0x60, WDT_INDEX_IO_PORT); /* Read Index 0x60 */ + addr_h = inb(WDT_DATA_IO_PORT); + + outb_p(0x61, WDT_INDEX_IO_PORT); /* Read Index 0x61 */ + + addr_l = inb(WDT_DATA_IO_PORT); + + swc_base_addr = (addr_h << 8) + addr_l; + +#ifdef DEBUG + printk(KERN_INFO DPFX "Read SWC I/O Base Address: low %d, high %d," + " res %d\n", addr_l, addr_h, swc_base_addr); +#endif + + return swc_base_addr; +} + +/* Select Bank 3 of SWC */ + +static inline void pc87413_swc_bank3(unsigned int swc_base_addr) +{ + /* Step 4: Select Bank3 of SWC */ + + outb_p(inb(swc_base_addr + 0x0f) | 0x03, swc_base_addr + 0x0f); + +#ifdef DEBUG + printk(KERN_INFO DPFX "Select Bank3 of SWC\n"); +#endif +} + +/* Set watchdog timeout to x minutes */ + +static inline void pc87413_programm_wdto(unsigned int swc_base_addr, + char pc87413_time) +{ + /* Step 5: Programm WDTO, Twd. */ + + outb_p(pc87413_time, swc_base_addr + WDTO); + +#ifdef DEBUG + printk(KERN_INFO DPFX "Set WDTO to %d minutes\n", pc87413_time); +#endif +} + +/* Enable WDEN */ + +static inline void pc87413_enable_wden(unsigned int swc_base_addr) +{ + /* Step 6: Enable WDEN */ + + outb_p(inb (swc_base_addr + WDCTL) | 0x01, swc_base_addr + WDCTL); + +#ifdef DEBUG + printk(KERN_INFO DPFX "Enable WDEN\n"); +#endif +} + +/* Enable SW_WD_TREN */ +static inline void pc87413_enable_sw_wd_tren(unsigned int swc_base_addr) +{ + /* Enable SW_WD_TREN */ + + outb_p(inb (swc_base_addr + WDCFG) | 0x80, swc_base_addr + WDCFG); + +#ifdef DEBUG + printk(KERN_INFO DPFX "Enable SW_WD_TREN\n"); +#endif +} + +/* Disable SW_WD_TREN */ + +static inline void pc87413_disable_sw_wd_tren(unsigned int swc_base_addr) +{ + /* Disable SW_WD_TREN */ + + outb_p(inb (swc_base_addr + WDCFG) & 0x7f, swc_base_addr + WDCFG); + +#ifdef DEBUG + printk(KERN_INFO DPFX "pc87413 - Disable SW_WD_TREN\n"); +#endif +} + +/* Enable SW_WD_TRG */ + +static inline void pc87413_enable_sw_wd_trg(unsigned int swc_base_addr) +{ + /* Enable SW_WD_TRG */ + + outb_p(inb (swc_base_addr + WDCTL) | 0x80, swc_base_addr + WDCTL); + +#ifdef DEBUG + printk(KERN_INFO DPFX "pc87413 - Enable SW_WD_TRG\n"); +#endif +} + +/* Disable SW_WD_TRG */ + +static inline void pc87413_disable_sw_wd_trg(unsigned int swc_base_addr) +{ + /* Disable SW_WD_TRG */ + + outb_p(inb (swc_base_addr + WDCTL) & 0x7f, swc_base_addr + WDCTL); + +#ifdef DEBUG + printk(KERN_INFO DPFX "Disable SW_WD_TRG\n"); +#endif +} + +/* -- Higher level functions ------------------------------------*/ + +/* Enable the watchdog */ + +static void pc87413_enable(void) +{ + unsigned int swc_base_addr; + + spin_lock(&io_lock); + + pc87413_select_wdt_out(); + pc87413_enable_swc(); + swc_base_addr = pc87413_get_swc_base(); + pc87413_swc_bank3(swc_base_addr); + pc87413_programm_wdto(swc_base_addr, timeout); + pc87413_enable_wden(swc_base_addr); + pc87413_enable_sw_wd_tren(swc_base_addr); + pc87413_enable_sw_wd_trg(swc_base_addr); + + spin_unlock(&io_lock); +} + +/* Disable the watchdog */ + +static void pc87413_disable(void) +{ + unsigned int swc_base_addr; + + spin_lock(&io_lock); + + pc87413_select_wdt_out(); + pc87413_enable_swc(); + swc_base_addr = pc87413_get_swc_base(); + pc87413_swc_bank3(swc_base_addr); + pc87413_disable_sw_wd_tren(swc_base_addr); + pc87413_disable_sw_wd_trg(swc_base_addr); + pc87413_programm_wdto(swc_base_addr, 0); + + spin_unlock(&io_lock); +} + +/* Refresh the watchdog */ + +static void pc87413_refresh(void) +{ + unsigned int swc_base_addr; + + spin_lock(&io_lock); + + pc87413_select_wdt_out(); + pc87413_enable_swc(); + swc_base_addr = pc87413_get_swc_base(); + pc87413_swc_bank3(swc_base_addr); + pc87413_disable_sw_wd_tren(swc_base_addr); + pc87413_disable_sw_wd_trg(swc_base_addr); + pc87413_programm_wdto(swc_base_addr, timeout); + pc87413_enable_wden(swc_base_addr); + pc87413_enable_sw_wd_tren(swc_base_addr); + pc87413_enable_sw_wd_trg(swc_base_addr); + + spin_unlock(&io_lock); +} + +/* -- File operations -------------------------------------------*/ + +/** + * pc87413_open: + * @inode: inode of device + * @file: file handle to device + * + */ + +static int pc87413_open(struct inode *inode, struct file *file) +{ + /* /dev/watchdog can only be opened once */ + + if (test_and_set_bit(0, &timer_enabled)) + return -EBUSY; + + if (nowayout) + __module_get(THIS_MODULE); + + /* Reload and activate timer */ + pc87413_refresh(); + + printk(KERN_INFO MODNAME "Watchdog enabled. Timeout set to" + " %d minute(s).\n", timeout); + + return nonseekable_open(inode, file); +} + +/** + * pc87413_release: + * @inode: inode to board + * @file: file handle to board + * + * The watchdog has a configurable API. There is a religious dispute + * between people who want their watchdog to be able to shut down and + * those who want to be sure if the watchdog manager dies the machine + * reboots. In the former case we disable the counters, in the latter + * case you have to open it again very soon. + */ + +static int pc87413_release(struct inode *inode, struct file *file) +{ + /* Shut off the timer. */ + + if (expect_close == 42) { + pc87413_disable(); + printk(KERN_INFO MODNAME "Watchdog disabled," + " sleeping again...\n"); + } else { + printk(KERN_CRIT MODNAME "Unexpected close, not stopping" + " watchdog!\n"); + pc87413_refresh(); + } + + clear_bit(0, &timer_enabled); + expect_close = 0; + + return 0; +} + +/** + * pc87413_status: + * + * return, if the watchdog is enabled (timeout is set...) + */ + + +static int pc87413_status(void) +{ + return 0; /* currently not supported */ +} + +/** + * pc87413_write: + * @file: file handle to the watchdog + * @data: data buffer to write + * @len: length in bytes + * @ppos: pointer to the position to write. No seeks allowed + * + * A write to a watchdog device is defined as a keepalive signal. Any + * write of data will do, as we we don't define content meaning. + */ + +static ssize_t pc87413_write(struct file *file, const char __user *data, + size_t len, loff_t *ppos) +{ + /* See if we got the magic character 'V' and reload the timer */ + if (len) { + if (!nowayout) { + size_t i; + + /* reset expect flag */ + expect_close = 0; + + /* scan to see whether or not we got the magic character */ + for (i = 0; i != len; i++) { + char c; + if (get_user(c, data+i)) + return -EFAULT; + if (c == 'V') + expect_close = 42; + } + } + + /* someone wrote to us, we should reload the timer */ + pc87413_refresh(); + } + return len; +} + +/** + * pc87413_ioctl: + * @inode: inode of the device + * @file: file handle to the device + * @cmd: watchdog command + * @arg: argument pointer + * + * The watchdog API defines a common set of functions for all watchdogs + * according to their available features. We only actually usefully support + * querying capabilities and current status. + */ + +static int pc87413_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg) +{ + int new_timeout; + + union { + struct watchdog_info __user *ident; + int __user *i; + } uarg; + + static struct watchdog_info ident = { + .options = WDIOF_KEEPALIVEPING | + WDIOF_SETTIMEOUT | + WDIOF_MAGICCLOSE, + .firmware_version = 1, + .identity = "PC87413(HF/F) watchdog" + }; + + uarg.i = (int __user *)arg; + + switch(cmd) { + default: + return -ENOTTY; + + case WDIOC_GETSUPPORT: + return copy_to_user(uarg.ident, &ident, + sizeof(ident)) ? -EFAULT : 0; + + case WDIOC_GETSTATUS: + return put_user(pc87413_status(), uarg.i); + + case WDIOC_GETBOOTSTATUS: + return put_user(0, uarg.i); + + case WDIOC_KEEPALIVE: + pc87413_refresh(); +#ifdef DEBUG + printk(KERN_INFO DPFX "keepalive\n"); +#endif + return 0; + + case WDIOC_SETTIMEOUT: + if (get_user(new_timeout, uarg.i)) + return -EFAULT; + + // the API states this is given in secs + new_timeout /= 60; + + if (new_timeout < 0 || new_timeout > MAX_TIMEOUT) + return -EINVAL; + + timeout = new_timeout; + pc87413_refresh(); + + // fall through and return the new timeout... + + case WDIOC_GETTIMEOUT: + + new_timeout = timeout * 60; + + return put_user(new_timeout, uarg.i); + + case WDIOC_SETOPTIONS: + { + int options, retval = -EINVAL; + + if (get_user(options, uarg.i)) + return -EFAULT; + + if (options & WDIOS_DISABLECARD) { + pc87413_disable(); + retval = 0; + } + + if (options & WDIOS_ENABLECARD) { + pc87413_enable(); + retval = 0; + } + + return retval; + } + } +} + +/* -- Notifier funtions -----------------------------------------*/ + +/** + * notify_sys: + * @this: our notifier block + * @code: the event being reported + * @unused: unused + * + * Our notifier is called on system shutdowns. We want to turn the card + * off at reboot otherwise the machine will reboot again during memory + * test or worse yet during the following fsck. This would suck, in fact + * trust me - if it happens it does suck. + */ + +static int pc87413_notify_sys(struct notifier_block *this, + unsigned long code, + void *unused) +{ + if (code == SYS_DOWN || code == SYS_HALT) + { + /* Turn the card off */ + pc87413_disable(); + } + return NOTIFY_DONE; +} + +/* -- Module's structures ---------------------------------------*/ + +static struct file_operations pc87413_fops = { + .owner = THIS_MODULE, + .llseek = no_llseek, + .write = pc87413_write, + .ioctl = pc87413_ioctl, + .open = pc87413_open, + .release = pc87413_release, +}; + +static struct notifier_block pc87413_notifier = +{ + .notifier_call = pc87413_notify_sys, +}; + +static struct miscdevice pc87413_miscdev= +{ + .minor = WATCHDOG_MINOR, + .name = "watchdog", + .fops = &pc87413_fops +}; + +/* -- Module init functions -------------------------------------*/ + +/** + * pc87413_init: module's "constructor" + * + * Set up the WDT watchdog board. All we have to do is grab the + * resources we require and bitch if anyone beat us to them. + * The open() function will actually kick the board off. + */ + +static int __init pc87413_init(void) +{ + int ret; + + spin_lock_init(&io_lock); + + printk(KERN_INFO PFX "Version " VERSION " at io 0x%X\n", WDT_INDEX_IO_PORT); + + /* request_region(io, 2, "pc87413"); */ + + ret = register_reboot_notifier(&pc87413_notifier); + if (ret != 0) { + printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", + ret); + } + + ret = misc_register(&pc87413_miscdev); + + if (ret != 0) { + printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", + WATCHDOG_MINOR, ret); + unregister_reboot_notifier(&pc87413_notifier); + return ret; + } + + printk(KERN_INFO PFX "initialized. timeout=%d min \n", timeout); + + pc87413_enable(); + + return 0; +} + +/** + * pc87413_exit: module's "destructor" + * + * Unload the watchdog. You cannot do this with any file handles open. + * If your watchdog is set to continue ticking on close and you unload + * it, well it keeps ticking. We won't get the interrupt but the board + * will not touch PC memory so all is fine. You just have to load a new + * module in 60 seconds or reboot. + */ + +static void __exit pc87413_exit(void) +{ + /* Stop the timer before we leave */ + if (!nowayout) + { + pc87413_disable(); + printk(KERN_INFO MODNAME "Watchdog disabled.\n"); + } + + misc_deregister(&pc87413_miscdev); + unregister_reboot_notifier(&pc87413_notifier); + /* release_region(io,2); */ + + printk(MODNAME " watchdog component driver removed.\n"); +} + +module_init(pc87413_init); +module_exit(pc87413_exit); + +MODULE_AUTHOR("Sven Anders <anders@anduras.de>, Marcus Junker <junker@anduras.de>,"); +MODULE_DESCRIPTION("PC87413 WDT driver"); +MODULE_LICENSE("GPL"); + +MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); + +module_param(io, int, 0); +MODULE_PARM_DESC(io, MODNAME " I/O port (default: " __MODULE_STRING(io) ")."); + +module_param(timeout, int, 0); +MODULE_PARM_DESC(timeout, "Watchdog timeout in minutes (default=" __MODULE_STRING(timeout) ")."); + +module_param(nowayout, int, 0); +MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)"); + diff --git a/drivers/char/watchdog/rm9k_wdt.c b/drivers/char/watchdog/rm9k_wdt.c new file mode 100644 index 000000000000..ec3909371c21 --- /dev/null +++ b/drivers/char/watchdog/rm9k_wdt.c @@ -0,0 +1,420 @@ +/* + * Watchdog implementation for GPI h/w found on PMC-Sierra RM9xxx + * chips. + * + * Copyright (C) 2004 by Basler Vision Technologies AG + * Author: Thomas Koeller <thomas.koeller@baslerweb.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; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/platform_device.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/interrupt.h> +#include <linux/fs.h> +#include <linux/reboot.h> +#include <linux/notifier.h> +#include <linux/miscdevice.h> +#include <linux/watchdog.h> +#include <asm/io.h> +#include <asm/atomic.h> +#include <asm/processor.h> +#include <asm/uaccess.h> +#include <asm/system.h> +#include <asm/rm9k-ocd.h> + +#include <rm9k_wdt.h> + + +#define CLOCK 125000000 +#define MAX_TIMEOUT_SECONDS 32 +#define CPCCR 0x0080 +#define CPGIG1SR 0x0044 +#define CPGIG1ER 0x0054 + + +/* Function prototypes */ +static irqreturn_t wdt_gpi_irqhdl(int, void *, struct pt_regs *); +static void wdt_gpi_start(void); +static void wdt_gpi_stop(void); +static void wdt_gpi_set_timeout(unsigned int); +static int wdt_gpi_open(struct inode *, struct file *); +static int wdt_gpi_release(struct inode *, struct file *); +static ssize_t wdt_gpi_write(struct file *, const char __user *, size_t, loff_t *); +static long wdt_gpi_ioctl(struct file *, unsigned int, unsigned long); +static int wdt_gpi_notify(struct notifier_block *, unsigned long, void *); +static const struct resource *wdt_gpi_get_resource(struct platform_device *, const char *, unsigned int); +static int __init wdt_gpi_probe(struct device *); +static int __exit wdt_gpi_remove(struct device *); + + +static const char wdt_gpi_name[] = "wdt_gpi"; +static atomic_t opencnt; +static int expect_close; +static int locked; + + +/* These are set from device resources */ +static void __iomem * wd_regs; +static unsigned int wd_irq, wd_ctr; + + +/* Module arguments */ +static int timeout = MAX_TIMEOUT_SECONDS; +module_param(timeout, int, 0444); +MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds"); + +static unsigned long resetaddr = 0xbffdc200; +module_param(resetaddr, ulong, 0444); +MODULE_PARM_DESC(resetaddr, "Address to write to to force a reset"); + +static unsigned long flagaddr = 0xbffdc104; +module_param(flagaddr, ulong, 0444); +MODULE_PARM_DESC(flagaddr, "Address to write to boot flags to"); + +static int powercycle; +module_param(powercycle, bool, 0444); +MODULE_PARM_DESC(powercycle, "Cycle power if watchdog expires"); + +static int nowayout = WATCHDOG_NOWAYOUT; +module_param(nowayout, bool, 0444); +MODULE_PARM_DESC(nowayout, "Watchdog cannot be disabled once started"); + + +/* Interrupt handler */ +static irqreturn_t wdt_gpi_irqhdl(int irq, void *ctxt, struct pt_regs *regs) +{ + if (!unlikely(__raw_readl(wd_regs + 0x0008) & 0x1)) + return IRQ_NONE; + __raw_writel(0x1, wd_regs + 0x0008); + + + printk(KERN_CRIT "%s: watchdog expired - resetting system\n", + wdt_gpi_name); + + *(volatile char *) flagaddr |= 0x01; + *(volatile char *) resetaddr = powercycle ? 0x01 : 0x2; + iob(); + while (1) + cpu_relax(); +} + + +/* Watchdog functions */ +static void wdt_gpi_start(void) +{ + u32 reg; + + lock_titan_regs(); + reg = titan_readl(CPGIG1ER); + titan_writel(reg | (0x100 << wd_ctr), CPGIG1ER); + iob(); + unlock_titan_regs(); +} + +static void wdt_gpi_stop(void) +{ + u32 reg; + + lock_titan_regs(); + reg = titan_readl(CPCCR) & ~(0xf << (wd_ctr * 4)); + titan_writel(reg, CPCCR); + reg = titan_readl(CPGIG1ER); + titan_writel(reg & ~(0x100 << wd_ctr), CPGIG1ER); + iob(); + unlock_titan_regs(); +} + +static void wdt_gpi_set_timeout(unsigned int to) +{ + u32 reg; + const u32 wdval = (to * CLOCK) & ~0x0000000f; + + lock_titan_regs(); + reg = titan_readl(CPCCR) & ~(0xf << (wd_ctr * 4)); + titan_writel(reg, CPCCR); + wmb(); + __raw_writel(wdval, wd_regs + 0x0000); + wmb(); + titan_writel(reg | (0x2 << (wd_ctr * 4)), CPCCR); + wmb(); + titan_writel(reg | (0x5 << (wd_ctr * 4)), CPCCR); + iob(); + unlock_titan_regs(); +} + + +/* /dev/watchdog operations */ +static int wdt_gpi_open(struct inode *inode, struct file *file) +{ + int res; + + if (unlikely(atomic_dec_if_positive(&opencnt) < 0)) + return -EBUSY; + + expect_close = 0; + if (locked) { + module_put(THIS_MODULE); + free_irq(wd_irq, &miscdev); + locked = 0; + } + + res = request_irq(wd_irq, wdt_gpi_irqhdl, SA_SHIRQ | SA_INTERRUPT, + wdt_gpi_name, &miscdev); + if (unlikely(res)) + return res; + + wdt_gpi_set_timeout(timeout); + wdt_gpi_start(); + + printk(KERN_INFO "%s: watchdog started, timeout = %u seconds\n", + wdt_gpi_name, timeout); + return nonseekable_open(inode, file); +} + +static int wdt_gpi_release(struct inode *inode, struct file *file) +{ + if (nowayout) { + printk(KERN_INFO "%s: no way out - watchdog left running\n", + wdt_gpi_name); + __module_get(THIS_MODULE); + locked = 1; + } else { + if (expect_close) { + wdt_gpi_stop(); + free_irq(wd_irq, &miscdev); + printk(KERN_INFO "%s: watchdog stopped\n", wdt_gpi_name); + } else { + printk(KERN_CRIT "%s: unexpected close() -" + " watchdog left running\n", + wdt_gpi_name); + wdt_gpi_set_timeout(timeout); + __module_get(THIS_MODULE); + locked = 1; + } + } + + atomic_inc(&opencnt); + return 0; +} + +static ssize_t +wdt_gpi_write(struct file *f, const char __user *d, size_t s, loff_t *o) +{ + char val; + + wdt_gpi_set_timeout(timeout); + expect_close = (s > 0) && !get_user(val, d) && (val == 'V'); + return s ? 1 : 0; +} + +static long +wdt_gpi_ioctl(struct file *f, unsigned int cmd, unsigned long arg) +{ + long res = -ENOTTY; + const long size = _IOC_SIZE(cmd); + int stat; + void __user *argp = (void __user *)arg; + static struct watchdog_info wdinfo = { + .identity = "RM9xxx/GPI watchdog", + .firmware_version = 0, + .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING + }; + + if (unlikely(_IOC_TYPE(cmd) != WATCHDOG_IOCTL_BASE)) + return -ENOTTY; + + if ((_IOC_DIR(cmd) & _IOC_READ) + && !access_ok(VERIFY_WRITE, arg, size)) + return -EFAULT; + + if ((_IOC_DIR(cmd) & _IOC_WRITE) + && !access_ok(VERIFY_READ, arg, size)) + return -EFAULT; + + expect_close = 0; + + switch (cmd) { + case WDIOC_GETSUPPORT: + wdinfo.options = nowayout ? + WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING : + WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE; + res = __copy_to_user(argp, &wdinfo, size) ? -EFAULT : size; + break; + + case WDIOC_GETSTATUS: + break; + + case WDIOC_GETBOOTSTATUS: + stat = (*(volatile char *) flagaddr & 0x01) + ? WDIOF_CARDRESET : 0; + res = __copy_to_user(argp, &stat, size) ? + -EFAULT : size; + break; + + case WDIOC_SETOPTIONS: + break; + + case WDIOC_KEEPALIVE: + wdt_gpi_set_timeout(timeout); + res = size; + break; + + case WDIOC_SETTIMEOUT: + { + int val; + if (unlikely(__copy_from_user(&val, argp, size))) { + res = -EFAULT; + break; + } + + if (val > MAX_TIMEOUT_SECONDS) + val = MAX_TIMEOUT_SECONDS; + timeout = val; + wdt_gpi_set_timeout(val); + res = size; + printk(KERN_INFO "%s: timeout set to %u seconds\n", + wdt_gpi_name, timeout); + } + break; + + case WDIOC_GETTIMEOUT: + res = __copy_to_user(argp, &timeout, size) ? + -EFAULT : size; + break; + } + + return res; +} + + +/* Shutdown notifier */ +static int +wdt_gpi_notify(struct notifier_block *this, unsigned long code, void *unused) +{ + if (code == SYS_DOWN || code == SYS_HALT) + wdt_gpi_stop(); + + return NOTIFY_DONE; +} + + +/* Kernel interfaces */ +static struct file_operations fops = { + .owner = THIS_MODULE, + .open = wdt_gpi_open, + .release = wdt_gpi_release, + .write = wdt_gpi_write, + .unlocked_ioctl = wdt_gpi_ioctl, +}; + +static struct miscdevice miscdev = { + .minor = WATCHDOG_MINOR, + .name = wdt_gpi_name, + .fops = &fops, +}; + +static struct notifier_block wdt_gpi_shutdown = { + .notifier_call = wdt_gpi_notify, +}; + + +/* Init & exit procedures */ +static const struct resource * +wdt_gpi_get_resource(struct platform_device *pdv, const char *name, + unsigned int type) +{ + char buf[80]; + if (snprintf(buf, sizeof buf, "%s_0", name) >= sizeof buf) + return NULL; + return platform_get_resource_byname(pdv, type, buf); +} + +/* No hotplugging on the platform bus - use __init */ +static int __init wdt_gpi_probe(struct device *dev) +{ + int res; + struct platform_device * const pdv = to_platform_device(dev); + const struct resource + * const rr = wdt_gpi_get_resource(pdv, WDT_RESOURCE_REGS, + IORESOURCE_MEM), + * const ri = wdt_gpi_get_resource(pdv, WDT_RESOURCE_IRQ, + IORESOURCE_IRQ), + * const rc = wdt_gpi_get_resource(pdv, WDT_RESOURCE_COUNTER, + 0); + + if (unlikely(!rr || !ri || !rc)) + return -ENXIO; + + wd_regs = ioremap_nocache(rr->start, rr->end + 1 - rr->start); + if (unlikely(!wd_regs)) + return -ENOMEM; + wd_irq = ri->start; + wd_ctr = rc->start; + res = misc_register(&miscdev); + if (res) + iounmap(wd_regs); + else + register_reboot_notifier(&wdt_gpi_shutdown); + return res; +} + +static int __exit wdt_gpi_remove(struct device *dev) +{ + int res; + + unregister_reboot_notifier(&wdt_gpi_shutdown); + res = misc_deregister(&miscdev); + iounmap(wd_regs); + wd_regs = NULL; + return res; +} + + +/* Device driver init & exit */ +static struct device_driver wdt_gpi_driver = { + .name = (char *) wdt_gpi_name, + .bus = &platform_bus_type, + .owner = THIS_MODULE, + .probe = wdt_gpi_probe, + .remove = __exit_p(wdt_gpi_remove), + .shutdown = NULL, + .suspend = NULL, + .resume = NULL, +}; + +static int __init wdt_gpi_init_module(void) +{ + atomic_set(&opencnt, 1); + if (timeout > MAX_TIMEOUT_SECONDS) + timeout = MAX_TIMEOUT_SECONDS; + return driver_register(&wdt_gpi_driver); +} + +static void __exit wdt_gpi_cleanup_module(void) +{ + driver_unregister(&wdt_gpi_driver); +} + +module_init(wdt_gpi_init_module); +module_exit(wdt_gpi_cleanup_module); + +MODULE_AUTHOR("Thomas Koeller <thomas.koeller@baslerweb.com>"); +MODULE_DESCRIPTION("Basler eXcite watchdog driver for gpi devices"); +MODULE_VERSION("0.1"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); + |
