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authorMichael Buesch <mb@bu3sch.de>2009-02-27 18:59:05 +0300
committerJohn W. Linville <linville@tuxdriver.com>2009-03-05 22:39:32 +0300
commite79c1ba84c68de9161d541bd2bcc8ea65c89955c (patch)
tree9399343651e9d92fb92f0c7bd6280353cb296913 /drivers/ssb/pci.c
parente31ae0508315ebf5d8b1b8a1fca8550737fb3996 (diff)
downloadlinux-e79c1ba84c68de9161d541bd2bcc8ea65c89955c.tar.xz
ssb: Add SPROM fallback support
This adds SSB functionality to register a fallback SPROM image from the architecture setup code. Weird architectures exist that have half-assed SSB devices without SPROM attached to their PCI busses. The architecture can register a fallback SPROM image that is used if no SPROM is found on the SSB device. Signed-off-by: Michael Buesch <mb@bu3sch.de> Cc: Florian Fainelli <florian@openwrt.org> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/ssb/pci.c')
-rw-r--r--drivers/ssb/pci.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/drivers/ssb/pci.c b/drivers/ssb/pci.c
index c958ac16423c..40ea41762247 100644
--- a/drivers/ssb/pci.c
+++ b/drivers/ssb/pci.c
@@ -564,6 +564,7 @@ static int sprom_extract(struct ssb_bus *bus, struct ssb_sprom *out,
static int ssb_pci_sprom_get(struct ssb_bus *bus,
struct ssb_sprom *sprom)
{
+ const struct ssb_sprom *fallback;
int err = -ENOMEM;
u16 *buf;
@@ -583,12 +584,23 @@ static int ssb_pci_sprom_get(struct ssb_bus *bus,
bus->sprom_size = SSB_SPROMSIZE_WORDS_R4;
sprom_do_read(bus, buf);
err = sprom_check_crc(buf, bus->sprom_size);
- if (err)
+ if (err) {
+ /* All CRC attempts failed.
+ * Maybe there is no SPROM on the device?
+ * If we have a fallback, use that. */
+ fallback = ssb_get_fallback_sprom();
+ if (fallback) {
+ memcpy(sprom, fallback, sizeof(*sprom));
+ err = 0;
+ goto out_free;
+ }
ssb_printk(KERN_WARNING PFX "WARNING: Invalid"
" SPROM CRC (corrupt SPROM)\n");
+ }
}
err = sprom_extract(bus, sprom, buf, bus->sprom_size);
+out_free:
kfree(buf);
out:
return err;