1 files changed, 307 insertions, 0 deletions

diff --git a/drivers/watchdog/iTCO_vendor_support.c b/drivers/watchdog/iTCO_vendor_support.c
new file mode 100644
index 000000000000..415083990097
--- /dev/null
+++ b/drivers/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");
+