arm: at91/spl: mpddrc: use IP version to check configuration

To remove the unnecessary #ifdef-endif, use the mpddrc IP version
to check whether or not the interleaved decoding type is supported.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Reviewed-by: Andreas Bießmann <andreas.devel@googlemail.com>

diff --git a/arch/arm/mach-at91/mpddrc.c b/arch/arm/mach-at91/mpddrc.c
index 1e1ff1d..16e089c 100644 (file)
--- a/arch/arm/mach-at91/mpddrc.c
+++ b/arch/arm/mach-at91/mpddrc.c
@@ -12,6 +12,8 @@
 #include <asm/io.h>
 #include <asm/arch/atmel_mpddrc.h>
 
+#define SAMA5D3_MPDDRC_VERSION         0x140
+
 static inline void atmel_mpddr_op(const struct atmel_mpddr *mpddr,
              int mode,
              u32 ram_address)
@@ -20,13 +22,15 @@ static inline void atmel_mpddr_op(const struct atmel_mpddr *mpddr,
        writel(0, ram_address);
 }
 
-static int ddr2_decodtype_is_seq(u32 cr)
+static int ddr2_decodtype_is_seq(const unsigned int base, u32 cr)
 {
-#if defined(CONFIG_SAMA5D3) || defined(CONFIG_SAMA5D4) || \
-       defined(CONFIG_AT91SAM9X5) || defined(CONFIG_AT91SAM9N12)
-       if (cr & ATMEL_MPDDRC_CR_DECOD_INTERLEAVED)
+       struct atmel_mpddr *mpddr = (struct atmel_mpddr *)base;
+       u16 version = readl(&mpddr->version) & 0xffff;
+
+       if ((version >= SAMA5D3_MPDDRC_VERSION) &&
+           (cr & ATMEL_MPDDRC_CR_DECOD_INTERLEAVED))
                return 0;
-#endif
+
        return 1;
 }
 
@@ -41,7 +45,7 @@ int ddr2_init(const unsigned int base,
 
        /* Compute bank offset according to NC in configuration register */
        ba_off = (mpddr_value->cr & ATMEL_MPDDRC_CR_NC_MASK) + 9;
-       if (ddr2_decodtype_is_seq(mpddr_value->cr))
+       if (ddr2_decodtype_is_seq(base, mpddr_value->cr))
                ba_off += ((mpddr_value->cr & ATMEL_MPDDRC_CR_NR_MASK) >> 2) + 11;
 
        ba_off += (mpddr_value->md & ATMEL_MPDDRC_MD_DBW_MASK) ? 1 : 2;
@@ -148,7 +152,7 @@ int ddr3_init(const unsigned int base,
 
        /* Compute bank offset according to NC in configuration register */
        ba_off = (mpddr_value->cr & ATMEL_MPDDRC_CR_NC_MASK) + 9;
-       if (ddr2_decodtype_is_seq(mpddr_value->cr))
+       if (ddr2_decodtype_is_seq(base, mpddr_value->cr))
                ba_off += ((mpddr_value->cr &
                           ATMEL_MPDDRC_CR_NR_MASK) >> 2) + 11;