[PATCH v2] edac: mpc85xx: add support for mpc83xx memory controller

Doug Thompson norsk5 at yahoo.com
Fri Jul 10 09:24:38 EST 2009


Ok, is this the one you want me to push upstream?

doug t


--- On Thu, 7/9/09, Ira W. Snyder <iws at ovro.caltech.edu> wrote:

From: Ira W. Snyder <iws at ovro.caltech.edu>
Subject: [PATCH v2] edac: mpc85xx: add support for mpc83xx memory controller
To: bluesmoke-devel at lists.sourceforge.net, "Dave Jiang" <djiang at mvista.com>, "Kumar Gala" <galak at kernel.crashing.org>, linuxppc-dev at ozlabs.org
Date: Thursday, July 9, 2009, 1:40 PM

Add support for the Freescale MPC83xx memory controller to the existing
driver for the Freescale MPC85xx memory controller. The only difference
between the two processors are in the CS_BNDS register parsing code, which
has been changed so it will work on both processors.

The L2 cache controller does not exist on the MPC83xx, but the OF subsystem
will not use the driver if the device is not present in the OF device tree.

Signed-off-by: Ira W. Snyder <iws at ovro.caltech.edu>
---

Kumar, I had to change the nr_pages calculation to make the math work
out. I checked it on my board and did the math by hand for a 64GB 85xx
using 64K pages. In both cases, nr_pages * PAGE_SIZE comes out to the
correct value. Thanks for the help.

v1 -> v2:
  * Use PAGE_SHIFT to parse cs_bnds regardless of board type
  * Remove special-casing for the 83xx processor

 drivers/edac/Kconfig        |    6 +++---
 drivers/edac/mpc85xx_edac.c |   28 +++++++++++++++++++---------
 2 files changed, 22 insertions(+), 12 deletions(-)

diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
index 4339b1a..78303f9 100644
--- a/drivers/edac/Kconfig
+++ b/drivers/edac/Kconfig
@@ -176,11 +176,11 @@ config EDAC_I5100
       San Clemente MCH.
 
 config EDAC_MPC85XX
-    tristate "Freescale MPC85xx"
-    depends on EDAC_MM_EDAC && FSL_SOC && MPC85xx
+    tristate "Freescale MPC83xx / MPC85xx"
+    depends on EDAC_MM_EDAC && FSL_SOC && (PPC_83xx || MPC85xx)
     help
       Support for error detection and correction on the Freescale
-      MPC8560, MPC8540, MPC8548
+      MPC8349, MPC8560, MPC8540, MPC8548
 
 config EDAC_MV64X60
     tristate "Marvell MV64x60"
diff --git a/drivers/edac/mpc85xx_edac.c b/drivers/edac/mpc85xx_edac.c
index b4f5c63..ba2a264 100644
--- a/drivers/edac/mpc85xx_edac.c
+++ b/drivers/edac/mpc85xx_edac.c
@@ -43,7 +43,9 @@ static u32 orig_pci_err_en;
 #endif
 
 static u32 orig_l2_err_disable;
+#ifdef CONFIG_MPC85xx
 static u32 orig_hid1[2];
+#endif
 
 /************************ MC SYSFS parts ***********************************/
 
@@ -790,19 +792,20 @@ static void __devinit mpc85xx_init_csrows(struct mem_ctl_info *mci)
         csrow = &mci->csrows[index];
         cs_bnds = in_be32(pdata->mc_vbase + MPC85XX_MC_CS_BNDS_0 +
                   (index * MPC85XX_MC_CS_BNDS_OFS));
-        start = (cs_bnds & 0xfff0000) << 4;
-        end = ((cs_bnds & 0xfff) << 20);
-        if (start)
-            start |= 0xfffff;
-        if (end)
-            end |= 0xfffff;
+
+        start = (cs_bnds & 0xffff0000) >> 16;
+        end   = (cs_bnds & 0x0000ffff);
 
         if (start == end)
             continue;    /* not populated */
 
+        start <<= (24 - PAGE_SHIFT);
+        end   <<= (24 - PAGE_SHIFT);
+        end    |= (1 << (24 - PAGE_SHIFT)) - 1;
+
         csrow->first_page = start >> PAGE_SHIFT;
         csrow->last_page = end >> PAGE_SHIFT;
-        csrow->nr_pages = csrow->last_page + 1 - csrow->first_page;
+        csrow->nr_pages = end + 1 - start;
         csrow->grain = 8;
         csrow->mtype = mtype;
         csrow->dtype = DEV_UNKNOWN;
@@ -986,6 +989,7 @@ static struct of_device_id mpc85xx_mc_err_of_match[] = {
     { .compatible = "fsl,mpc8560-memory-controller", },
     { .compatible = "fsl,mpc8568-memory-controller", },
     { .compatible = "fsl,mpc8572-memory-controller", },
+    { .compatible = "fsl,mpc8349-memory-controller", },
     {},
 };
 
@@ -1001,13 +1005,13 @@ static struct of_platform_driver mpc85xx_mc_err_driver = {
            },
 };
 
-
+#ifdef CONFIG_MPC85xx
 static void __init mpc85xx_mc_clear_rfxe(void *data)
 {
     orig_hid1[smp_processor_id()] = mfspr(SPRN_HID1);
     mtspr(SPRN_HID1, (orig_hid1[smp_processor_id()] & ~0x20000));
 }
-
+#endif
 
 static int __init mpc85xx_mc_init(void)
 {
@@ -1040,26 +1044,32 @@ static int __init mpc85xx_mc_init(void)
         printk(KERN_WARNING EDAC_MOD_STR "PCI fails to register\n");
 #endif
 
+#ifdef CONFIG_MPC85xx
     /*
      * need to clear HID1[RFXE] to disable machine check int
      * so we can catch it
      */
     if (edac_op_state == EDAC_OPSTATE_INT)
         on_each_cpu(mpc85xx_mc_clear_rfxe, NULL, 0);
+#endif
 
     return 0;
 }
 
 module_init(mpc85xx_mc_init);
 
+#ifdef CONFIG_MPC85xx
 static void __exit mpc85xx_mc_restore_hid1(void *data)
 {
     mtspr(SPRN_HID1, orig_hid1[smp_processor_id()]);
 }
+#endif
 
 static void __exit mpc85xx_mc_exit(void)
 {
+#ifdef CONFIG_MPC85xx
     on_each_cpu(mpc85xx_mc_restore_hid1, NULL, 0);
+#endif
 #ifdef CONFIG_PCI
     of_unregister_platform_driver(&mpc85xx_pci_err_driver);
 #endif
-- 
1.5.4.3


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