MIPS: BCM63xx: Fix SDRAM size computation for BCM6345

Instead of hardcoding the amount of available RAM, read the number of
effective multiples of 8MB from SDRAM_MBASE_REG.

Signed-off-by: Florian Fainelli <florian@openwrt.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3008/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

2 files changed, 6 insertions, 2 deletions

diff --git a/arch/mips/bcm63xx/cpu.c b/arch/mips/bcm63xx/cpu.c
index 80941687b9dd..8f0d6c7725ea 100644
--- a/arch/mips/bcm63xx/cpu.c
+++ b/arch/mips/bcm63xx/cpu.c
@@ -170,8 +170,10 @@ static unsigned int detect_memory_size(void)
         unsigned int cols = 0, rows = 0, is_32bits = 0, banks = 0;
         u32 val;
 
-        if (BCMCPU_IS_6345())
-                return (8 * 1024 * 1024);
+        if (BCMCPU_IS_6345()) {
+                val = bcm_sdram_readl(SDRAM_MBASE_REG);
+                return (val * 8 * 1024 * 1024);
+        }
 
         if (BCMCPU_IS_6338() || BCMCPU_IS_6348()) {
                 val = bcm_sdram_readl(SDRAM_CFG_REG);
diff --git a/arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h b/arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h
index 50057507c4e7..6c9940fb7b71 100644
--- a/arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h
+++ b/arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h
@@ -895,6 +895,8 @@
 #define SDRAM_CFG_BANK_SHIFT            13
 #define SDRAM_CFG_BANK_MASK             (1 << SDRAM_CFG_BANK_SHIFT)
 
+#define SDRAM_MBASE_REG                 0xc
+
 #define SDRAM_PRIO_REG                  0x2C
 #define SDRAM_PRIO_MIPS_SHIFT           29
 #define SDRAM_PRIO_MIPS_MASK            (1 << SDRAM_PRIO_MIPS_SHIFT)