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edac: i5100 fix enable ecc hardware

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It is possible that the BIOS did not enable ECC at boot time.  We check
for that case and fail to load if it is true.

Signed-off-by: Arthur Jones <ajones@riverbed.com>
Signed-off-by: Doug Thompson <dougthompson@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Arthur Jones 2008-07-25 01:49:06 -07:00 committed by Linus Torvalds
parent f7952ffcff
commit 43920a598f
1 changed files with 10 additions and 0 deletions
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10
drivers/edac/i5100_edac.c
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@ -24,6 +24,8 @@
/* register addresses and bit field accessors... */
/* device 16, func 1 */
#define I5100_MC 0x40 /* Memory Control Register */
#define I5100_MC_ERRDETEN(a) ((a) >> 5 & 1)
#define I5100_MS 0x44 /* Memory Status Register */
#define I5100_SPDDATA 0x48 /* Serial Presence Detect Status Reg */
#define I5100_SPDDATA_RDO(a) ((a) >> 15 & 1)
@ -688,6 +690,14 @@ static int __devinit i5100_init_one(struct pci_dev *pdev,
goto bail;
}
/* ECC enabled? */
pci_read_config_dword(pdev, I5100_MC, &dw);
if (!I5100_MC_ERRDETEN(dw)) {
printk(KERN_INFO "i5100_edac: ECC not enabled.\n");
ret = -ENODEV;
goto bail;
}
/* figure out how many ranks, from strapped state of 48GB_Mode input */
pci_read_config_dword(pdev, I5100_MS, &dw);
ranksperch = !!(dw & (1 << 8)) * 2 + 4;