If ide controllers are at legacy mode, only the 4th BAR
is needed, so some BIOS initiate other BAR with incorrect
value. ata/ata_piix calls pci_enable_device on the ide
controller, which will check BAR resources. If the BAR
resource values are incorrect, pci_enable_device will fail,
and ata/ata_piix couldn't attach the ide controller.
Below patch against 2.6.20 creates a quirk to correct the
bad BAR resources for a special ide controller which is
popular on tiger-4.
Signed-off-by: Zhang Yanmin <yanmin.zhang@xxxxxxxxx>
---
--- linux-2.6.20/arch/ia64/kernel/quirks.c 1970-01-01 08:00:00.000000000 +0800
+++ linux-2.6.20_fix/arch/ia64/kernel/quirks.c 2007-02-12 23:31:28.000000000 +0800
@@ -0,0 +1,47 @@
+/*
+ * This file contains work-arounds for ia64 platform bugs.
+ */
+#include <linux/pci.h>
+
+/*
+ * quirk_intel_ide_controller: If an ide/ata controller is
+ * at legacy mode, BIOS might initiates BAR(bar 0~3 and 5)
+ * with incorrect value. This quirk will reset the incorrect
+ * value to 0.
+ */
+static void __devinit quirk_intel_ide_controller(struct pci_dev *dev)
+{
+ unsigned int pos;
+ struct resource *res;
+ int fixed = 0;
+ u8 tmp8;
+ u8 mask;
+
+ if ((dev->class >> 8) != PCI_CLASS_STORAGE_IDE)
+ return;
+
+ /* TODO: What if one channel is in native mode ... */
+ pci_read_config_byte(dev, PCI_CLASS_PROG, &tmp8);
+ mask = (1 << 2) | (1 << 0);
+ if ((tmp8 & mask) == mask)
+ return;
+
+ for( pos = 0; pos < 6; pos ++ ) {
+ res = &dev->resource[pos];
+ if (!(res->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
+ continue;
+
+ if (!res->start && res->end) {
+ res->start = res->end = 0;
+ res->flags = 0;
+ fixed = 1;
+ }
+ }
+ if (fixed)
+ printk(KERN_WARNING
+ "PCI device %s: BIOS resource configuration fixed.\n",
+ pci_name(dev));
+}
+
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_11, quirk_intel_ide_controller);
+
--- linux-2.6.20/arch/ia64/kernel/Makefile 2007-02-08 15:13:41.000000000 +0800
+++ linux-2.6.20_fix/arch/ia64/kernel/Makefile 2007-02-12 22:49:39.000000000 +0800
@@ -33,6 +33,7 @@ obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
obj-$(CONFIG_IA64_UNCACHED_ALLOCATOR) += uncached.o
obj-$(CONFIG_AUDIT) += audit.o
obj-$(CONFIG_PCI_MSI) += msi_ia64.o
+obj-$(CONFIG_PCI) += quirks.o
mca_recovery-y += mca_drv.o mca_drv_asm.o
obj-$(CONFIG_IA64_ESI) += esi.o
-
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