Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 216 insertions, 0 deletions

diff --git a/drivers/watchdog/iTCO_vendor_support.c b/drivers/watchdog/iTCO_vendor_support.c
new file mode 100644
index 000000000..cf0eaa04b
--- /dev/null
+++ b/drivers/watchdog/iTCO_vendor_support.c
@@ -0,0 +1,216 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *	intel TCO vendor specific watchdog driver support
+ *
+ *	(c) Copyright 2006-2009 Wim Van Sebroeck <wim@iguana.be>.
+ *
+ *	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, ...
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+/* Module and version information */
+#define DRV_NAME	"iTCO_vendor_support"
+#define DRV_VERSION	"1.04"
+
+/* 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 <linux/io.h>			/* For inb/outb/... */
+
+#include "iTCO_vendor.h"
+
+/* List of vendor support modes */
+/* SuperMicro Pentium 3 Era 370SSE+-OEM1/P3TSSE */
+#define SUPERMICRO_OLD_BOARD	1
+/* SuperMicro Pentium 4 / Xeon 4 / EMT64T Era Systems - no longer supported */
+#define SUPERMICRO_NEW_BOARD	2
+/* Broken BIOS */
+#define BROKEN_BIOS		911
+
+int iTCO_vendorsupport;
+EXPORT_SYMBOL(iTCO_vendorsupport);
+
+module_param_named(vendorsupport, iTCO_vendorsupport, int, 0);
+MODULE_PARM_DESC(vendorsupport, "iTCO vendor specific support mode, default="
+			"0 (none), 1=SuperMicro Pent3, 911=Broken SMI BIOS");
+
+/*
+ *	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(struct resource *smires)
+{
+	unsigned long val32;
+
+	/* Bit 13: TCO_EN -> 0 = Disables TCO logic generating an SMI# */
+	val32 = inl(smires->start);
+	val32 &= 0xffffdfff;	/* Turn off SMI clearing watchdog */
+	outl(val32, smires->start);	/* Needed to activate watchdog */
+}
+
+static void supermicro_old_pre_stop(struct resource *smires)
+{
+	unsigned long val32;
+
+	/* Bit 13: TCO_EN -> 1 = Enables the TCO logic to generate SMI# */
+	val32 = inl(smires->start);
+	val32 |= 0x00002000;	/* Turn on SMI clearing watchdog */
+	outl(val32, smires->start);	/* Needed to deactivate watchdog */
+}
+
+/*
+ *	Vendor Support: 911
+ *	Board: Some Intel ICHx based motherboards
+ *	iTCO chipset: ICH7+
+ *
+ *	Some Intel motherboards have a broken BIOS implementation: i.e.
+ *	the SMI handler clear's the TIMEOUT bit in the TC01_STS register
+ *	and does not reload the time. Thus the TCO watchdog does not reboot
+ *	the system.
+ *
+ *	These are the conclusions of Andriy Gapon <avg@icyb.net.ua> after
+ *	debugging: the SMI handler is quite simple - it tests value in
+ *	TCO1_CNT against 0x800, i.e. checks TCO_TMR_HLT. If the bit is set
+ *	the handler goes into an infinite loop, apparently to allow the
+ *	second timeout and reboot. Otherwise it simply clears TIMEOUT bit
+ *	in TCO1_STS and that's it.
+ *	So the logic seems to be reversed, because it is hard to see how
+ *	TIMEOUT can get set to 1 and SMI generated when TCO_TMR_HLT is set
+ *	(other than a transitional effect).
+ *
+ *	The only fix found to get the motherboard(s) to reboot is to put
+ *	the glb_smi_en bit to 0. This is a dirty hack that bypasses the
+ *	broken code by disabling Global SMI.
+ *
+ *	WARNING: globally disabling SMI could possibly lead to dramatic
+ *	problems, especially on laptops! I.e. various ACPI things where
+ *	SMI is used for communication between OS and firmware.
+ *
+ *	Don't use this fix if you don't need to!!!
+ */
+
+static void broken_bios_start(struct resource *smires)
+{
+	unsigned long val32;
+
+	val32 = inl(smires->start);
+	/* Bit 13: TCO_EN     -> 0 = Disables TCO logic generating an SMI#
+	   Bit  0: GBL_SMI_EN -> 0 = No SMI# will be generated by ICH. */
+	val32 &= 0xffffdffe;
+	outl(val32, smires->start);
+}
+
+static void broken_bios_stop(struct resource *smires)
+{
+	unsigned long val32;
+
+	val32 = inl(smires->start);
+	/* Bit 13: TCO_EN     -> 1 = Enables TCO logic generating an SMI#
+	   Bit  0: GBL_SMI_EN -> 1 = Turn global SMI on again. */
+	val32 |= 0x00002001;
+	outl(val32, smires->start);
+}
+
+/*
+ *	Generic Support Functions
+ */
+
+void iTCO_vendor_pre_start(struct resource *smires,
+			   unsigned int heartbeat)
+{
+	switch (iTCO_vendorsupport) {
+	case SUPERMICRO_OLD_BOARD:
+		supermicro_old_pre_start(smires);
+		break;
+	case BROKEN_BIOS:
+		broken_bios_start(smires);
+		break;
+	}
+}
+EXPORT_SYMBOL(iTCO_vendor_pre_start);
+
+void iTCO_vendor_pre_stop(struct resource *smires)
+{
+	switch (iTCO_vendorsupport) {
+	case SUPERMICRO_OLD_BOARD:
+		supermicro_old_pre_stop(smires);
+		break;
+	case BROKEN_BIOS:
+		broken_bios_stop(smires);
+		break;
+	}
+}
+EXPORT_SYMBOL(iTCO_vendor_pre_stop);
+
+int iTCO_vendor_check_noreboot_on(void)
+{
+	switch (iTCO_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)
+{
+	if (iTCO_vendorsupport == SUPERMICRO_NEW_BOARD) {
+		pr_warn("Option vendorsupport=%d is no longer supported, "
+			"please use the w83627hf_wdt driver instead\n",
+			SUPERMICRO_NEW_BOARD);
+		return -EINVAL;
+	}
+	pr_info("vendor-support=%d\n", iTCO_vendorsupport);
+	return 0;
+}
+
+static void __exit iTCO_vendor_exit_module(void)
+{
+	pr_info("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");