From: Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>
There are some Linux supported platforms that simply cannot hit the low I/O
addresses used by ATA legacy mode PCI mappings. These platforms have a window
for PCI space that is fixed by the board logic and doesn't include the
neccessary locations.
Provide a config option so that such platforms faced with a controller that
they cannot support simply error it and punt
Signed-off-by: Alan Cox <alan@xxxxxxxxxx>
Cc: Jeff Garzik <jeff@xxxxxxxxxx>
Cc: Tejun Heo <htejun@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/ata/libata-sff.c | 9 +++++++++
1 files changed, 9 insertions(+)
diff -puN drivers/ata/libata-sff.c~libata-sff-allow-for-wacky-systems drivers/ata/libata-sff.c
--- a/drivers/ata/libata-sff.c~libata-sff-allow-for-wacky-systems
+++ a/drivers/ata/libata-sff.c
@@ -981,6 +981,15 @@ int ata_pci_init_one (struct pci_dev *pd
mask = (1 << 2) | (1 << 0);
if ((tmp8 & mask) != mask)
legacy_mode = (1 << 3);
+#if defined(CONFIG_NO_ATA_LEGACY)
+ /* Some platforms with PCI limits cannot address compat
+ port space. In that case we punt if their firmware has
+ left a device in compatibility mode */
+ if (legacy_mode) {
+ printk(KERN_ERR "ata: Compatibility mode ATA is not supported on this platform, skipping.\n");
+ return -EOPNOTSUPP;
+ }
+#endif
}
rc = pci_request_regions(pdev, DRV_NAME);
_
-
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