[PATCH] ohci1394 PCI fixup for Toshiba laptops

[Jesse Barnes <jbarnes@virtuousgeek.org>]

This is a fix for a bug I see on my Toshiba laptop, where the ohci1394 
controller gets initialized improperly.  The patch adds two PCI fixups 
to arch/i386/pci/fixup.c, one that happens early on to cache the value 
of the PCI_CACHE_LINE_SIZE config register, and another that later 
restores the value, along with a valid IRQ number and some BAR values.  
I've tested it on my laptop, and it prevents me from running into what 
I consider to be a major bug: IRQ 11 is disabled by the IRQ debug code, 
causing my wireless to break.

Thanks to Rob for the original patch to ohci1394.c and Stefan for lots 
of proofreading and additional information collection.  I think the DMI 
system list is correct, but we may need to add some more PCI IDs to the 
PCI_FIXUP macros over time.

Thanks,
Jesse

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

diff -Naur -X linux-2.6.14-rc5/Documentation/dontdiff linux-2.6.14-rc5.orig/arch/i386/pci/fixup.c linux-2.6.14-rc5/arch/i386/pci/fixup.c
--- linux-2.6.14-rc5.orig/arch/i386/pci/fixup.c	2005-10-19 23:23:05.000000000 -0700
+++ linux-2.6.14-rc5/arch/i386/pci/fixup.c	2005-10-24 18:40:15.000000000 -0700
@@ -2,6 +2,8 @@
  * Exceptions for specific devices. Usually work-arounds for fatal design flaws.
  */
 
+#include <linux/delay.h>
+#include <linux/dmi.h>
 #include <linux/pci.h>
 #include <linux/init.h>
 #include "pci.h"
@@ -384,3 +386,60 @@
 	}
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_video);
+
+/*
+ * Some Toshiba laptops need extra code to enable their TI TSB43AB22/A.
+ *
+ * We pretend to bring them out of full D3 state, and restore the proper
+ * IRQ, PCI cache line size, and BARs, otherwise the device won't function
+ * properly.  In some cases, the device will generate an interrupt on
+ * the wrong IRQ line, causing any devices sharing the the line it's
+ * *supposed* to use to be disabled by the kernel's IRQ debug code.
+ */
+static u16 toshiba_line_size;
+
+static struct dmi_system_id __devinit toshiba_ohci1394_dmi_table[] = {
+	{
+		.ident = "Toshiba PS5 based laptop",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
+			DMI_MATCH(DMI_PRODUCT_VERSION, "PS5"),
+		},
+	},
+	{
+		.ident = "Toshiba PSM4 based laptop",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
+			DMI_MATCH(DMI_PRODUCT_VERSION, "PSM4"),
+		},
+	},
+	{ }
+};
+
+static void __devinit pci_pre_fixup_toshiba_ohci1394(struct pci_dev *dev)
+{
+	if (!dmi_check_system(toshiba_ohci1394_dmi_table))
+		return; /* only applies to certain Toshibas (so far) */
+
+	dev->current_state = PCI_D3cold;
+	pci_read_config_word(dev, PCI_CACHE_LINE_SIZE, &toshiba_line_size);
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_TI, 0x8032,
+			 pci_pre_fixup_toshiba_ohci1394);
+
+static void __devinit pci_post_fixup_toshiba_ohci1394(struct pci_dev *dev)
+{
+	if (dmi_check_system(toshiba_ohci1394_dmi_table))
+		return; /* only applies to certain Toshibas (so far) */
+
+	/* Restore config space on Toshiba laptops */
+	mdelay(10);
+	pci_write_config_word(dev, PCI_CACHE_LINE_SIZE, toshiba_line_size);
+	pci_write_config_word(dev, PCI_INTERRUPT_LINE, dev->irq);
+	pci_write_config_dword(dev, PCI_BASE_ADDRESS_0,
+			       pci_resource_start(dev, 0));
+	pci_write_config_dword(dev, PCI_BASE_ADDRESS_1,
+			       pci_resource_start(dev, 1));
+}
+DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_TI, 0x8032,
+			 pci_post_fixup_toshiba_ohci1394);