[PATCH] ppc32: fix for misreported SDRAM size on Radstone PPC7D platform

This patch fixes the SDRAM output from /proc/cpuinfo.  The previous code
assumed that there was only one bank of SDRAM, and that the size in the memory
configuration register was the total size.

Signed-off-by: Chris Elston <chris.elston@radstone.co.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 13 insertions, 6 deletions

diff --git a/arch/ppc/platforms/radstone_ppc7d.c b/arch/ppc/platforms/radstone_ppc7d.c
index 2a99b43737a8..df2ea051380a 100644
--- a/arch/ppc/platforms/radstone_ppc7d.c
+++ b/arch/ppc/platforms/radstone_ppc7d.c
@@ -253,6 +253,8 @@ static int ppc7d_show_cpuinfo(struct seq_file *m)
         u8 val1, val2;
         static int flash_sizes[4] = { 64, 32, 0, 16 };
         static int flash_banks[4] = { 4, 3, 2, 1 };
+        static int sdram_bank_sizes[4] = { 128, 256, 512, 1 };
+        int sdram_num_banks = 2;
         static char *pci_modes[] = { "PCI33", "PCI66",
                 "Unknown", "Unknown",
                 "PCIX33", "PCIX66",
@@ -279,13 +281,17 @@ static int ppc7d_show_cpuinfo(struct seq_file *m)
                    (val1 == PPC7D_CPLD_MB_TYPE_PLL_100) ? 100 :
                    (val1 == PPC7D_CPLD_MB_TYPE_PLL_64) ? 64 : 0);
 
+        val = inb(PPC7D_CPLD_MEM_CONFIG);
+        if (val & PPC7D_CPLD_SDRAM_BANK_NUM_MASK) sdram_num_banks--;
+
         val = inb(PPC7D_CPLD_MEM_CONFIG_EXTEND);
-        val1 = val & PPC7D_CPLD_SDRAM_BANK_SIZE_MASK;
-        seq_printf(m, "SDRAM\t\t: %d%c",
-                   (val1 == PPC7D_CPLD_SDRAM_BANK_SIZE_128M) ? 128 :
-                   (val1 == PPC7D_CPLD_SDRAM_BANK_SIZE_256M) ? 256 :
-                   (val1 == PPC7D_CPLD_SDRAM_BANK_SIZE_512M) ? 512 : 1,
-                   (val1 == PPC7D_CPLD_SDRAM_BANK_SIZE_1G) ? 'G' : 'M');
+        val1 = (val & PPC7D_CPLD_SDRAM_BANK_SIZE_MASK) >> 6;
+        seq_printf(m, "SDRAM\t\t: %d banks of %d%c, total %d%c",
+                   sdram_num_banks,
+                   sdram_bank_sizes[val1],
+                   (sdram_bank_sizes[val1] < 128) ? 'G' : 'M',
+                   sdram_num_banks * sdram_bank_sizes[val1],
+                   (sdram_bank_sizes[val1] < 128) ? 'G' : 'M');
         if (val2 & PPC7D_CPLD_MB_TYPE_ECC_FITTED_MASK) {
                 seq_printf(m, " [ECC %sabled]",
                            (val2 & PPC7D_CPLD_MB_TYPE_ECC_ENABLE_MASK) ? "en" :
diff --git a/arch/ppc/platforms/radstone_ppc7d.h b/arch/ppc/platforms/radstone_ppc7d.h
index 4546fff2b0c3..938375510be4 100644
--- a/arch/ppc/platforms/radstone_ppc7d.h
+++ b/arch/ppc/platforms/radstone_ppc7d.h
@@ -240,6 +240,7 @@
 #define PPC7D_CPLD_FLASH_CNTL                   0x086E
 
 /* MEMORY_CONFIG_EXTEND */
+#define PPC7D_CPLD_SDRAM_BANK_NUM_MASK          0x02
 #define PPC7D_CPLD_SDRAM_BANK_SIZE_MASK         0xc0
 #define PPC7D_CPLD_SDRAM_BANK_SIZE_128M         0
 #define PPC7D_CPLD_SDRAM_BANK_SIZE_256M         0x40