edac: i5100 add 6 ranks per channel

Add support for 6 ranks per channel to the i5100 chipset.  I have tested
the patch as far as possible with correctible errors and things appear
good.  The DIMM mapping is correct for our board, but boards may differ.

Signed-off-by: Nils Carlson <nils.carlson@ludd.ltu.se>
Acked-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>

1 files changed, 20 insertions, 16 deletions

diff --git a/drivers/edac/i5100_edac.c b/drivers/edac/i5100_edac.c
index 9a933180b434..7785d8ffa404 100644
--- a/drivers/edac/i5100_edac.c
+++ b/drivers/edac/i5100_edac.c
@@ -9,6 +9,11 @@
  * Intel 5100X Chipset Memory Controller Hub (MCH) - Datasheet
  *      http://download.intel.com/design/chipsets/datashts/318378.pdf
  *
+ * The intel 5100 has two independent channels. EDAC core currently
+ * can not reflect this configuration so instead the chip-select
+ * rows for each respective channel are layed out one after another,
+ * the first half belonging to channel 0, the second half belonging
+ * to channel 1.
  */
 #include <linux/module.h>
 #include <linux/init.h>
@@ -734,7 +739,6 @@ static int i5100_read_spd_byte(const struct mem_ctl_info *mci,
  * fill dimm chip select map
  *
  * FIXME:
- *   o only valid for 4 ranks per channel
  *   o not the only way to may chip selects to dimm slots
  *   o investigate if there is some way to obtain this map from the bios
  */
@@ -743,8 +747,6 @@ static void __devinit i5100_init_dimm_csmap(struct mem_ctl_info *mci)
         struct i5100_priv *priv = mci->pvt_info;
         int i;
 
-        WARN_ON(priv->ranksperchan != 4);
-
         for (i = 0; i < I5100_MAX_DIMM_SLOTS_PER_CHAN; i++) {
                 int j;
 
@@ -753,12 +755,21 @@ static void __devinit i5100_init_dimm_csmap(struct mem_ctl_info *mci)
         }
 
         /* only 2 chip selects per slot... */
-        priv->dimm_csmap[0][0] = 0;
-        priv->dimm_csmap[0][1] = 3;
-        priv->dimm_csmap[1][0] = 1;
-        priv->dimm_csmap[1][1] = 2;
-        priv->dimm_csmap[2][0] = 2;
-        priv->dimm_csmap[3][0] = 3;
+        if (priv->ranksperchan == 4) {
+                priv->dimm_csmap[0][0] = 0;
+                priv->dimm_csmap[0][1] = 3;
+                priv->dimm_csmap[1][0] = 1;
+                priv->dimm_csmap[1][1] = 2;
+                priv->dimm_csmap[2][0] = 2;
+                priv->dimm_csmap[3][0] = 3;
+        } else {
+                priv->dimm_csmap[0][0] = 0;
+                priv->dimm_csmap[0][1] = 1;
+                priv->dimm_csmap[1][0] = 2;
+                priv->dimm_csmap[1][1] = 3;
+                priv->dimm_csmap[2][0] = 4;
+                priv->dimm_csmap[2][1] = 5;
+        }
 }
 
 static void __devinit i5100_init_dimm_layout(struct pci_dev *pdev,
@@ -905,13 +916,6 @@ static int __devinit i5100_init_one(struct pci_dev *pdev,
         pci_read_config_dword(pdev, I5100_MS, &dw);
         ranksperch = !!(dw & (1 << 8)) * 2 + 4;
 
-        if (ranksperch != 4) {
-                /* FIXME: get 6 ranks / channel to work - need hw... */
-                printk(KERN_INFO "i5100_edac: unsupported configuration.\n");
-                ret = -ENODEV;
-                goto bail_pdev;
-        }
-
         /* enable error reporting... */
         pci_read_config_dword(pdev, I5100_EMASK_MEM, &dw);
         dw &= ~I5100_FERR_NF_MEM_ANY_MASK;