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e752x_edac: provide more info about how DIMMS/ranks are mapped 

No funtional changes here. Only the comments got updated.

Reviewed-by: Aristeu Rozanski <arozansk@redhat.com>
Cc: Mark Gross <mark.gross@intel.com>
Cc: Doug Thompson <norsk5@yahoo.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mauro Carvalho Chehab 2012-03-15 13:41:17 -03:00
parent 64e1fdaf55
commit 805afb6997
1 changed files with 22 additions and 4 deletions
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26
drivers/edac/e752x_edac.c
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@ -4,10 +4,11 @@
* This file may be distributed under the terms of the * This file may be distributed under the terms of the
* GNU General Public License. * GNU General Public License.
* *
* See "enum e752x_chips" below for supported chipsets * Implement support for the e7520, E7525, e7320 and i3100 memory controllers.
* *
* Datasheet: * Datasheets:
* http://www.intel.in/content/www/in/en/chipsets/e7525-memory-controller-hub-datasheet.html * http://www.intel.in/content/www/in/en/chipsets/e7525-memory-controller-hub-datasheet.html
* ftp://download.intel.com/design/intarch/datashts/31345803.pdf
* *
* Written by Tom Zimmerman * Written by Tom Zimmerman
* *
@ -16,8 +17,6 @@
* Wang Zhenyu at intel.com * Wang Zhenyu at intel.com
* Dave Jiang at mvista.com * Dave Jiang at mvista.com
* *
* $Id: edac_e752x.c,v 1.5.2.11 2005/10/05 00:43:44 dsp_llnl Exp $
*
*/ */
#include <linux/module.h> #include <linux/module.h>
@ -190,6 +189,25 @@ enum e752x_chips {
I3100 = 3 I3100 = 3
}; };
/*
* Those chips Support single-rank and dual-rank memories only.
*
* On e752x chips, the odd rows are present only on dual-rank memories.
* Dividing the rank by two will provide the dimm#
*
* i3100 MC has a different mapping: it supports only 4 ranks.
*
* The mapping is (from 1 to n):
* slot single-ranked double-ranked
* dimm #1 -> rank #4 NA
* dimm #2 -> rank #3 NA
* dimm #3 -> rank #2 Ranks 2 and 3
* dimm #4 -> rank $1 Ranks 1 and 4
*
* FIXME: The current mapping for i3100 considers that it supports up to 8
* ranks/chanel, but datasheet says that the MC supports only 4 ranks.
*/
struct e752x_pvt { struct e752x_pvt {
struct pci_dev *bridge_ck; struct pci_dev *bridge_ck;
struct pci_dev *dev_d0f0; struct pci_dev *dev_d0f0;