[U-Boot] [PATCH v2 3/3] arm: at91/spl: mpddrc: use IP version to check configuration

[Wenyou Yang]

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 at atmel.com>
Reviewed-by: Andreas Bießmann <andreas.devel at googlemail.com>
---

Changes in v2:
 - add Reviewed-by from Andreas.

 arch/arm/mach-at91/mpddrc.c |   12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/arch/arm/mach-at91/mpddrc.c b/arch/arm/mach-at91/mpddrc.c
index 2b3a685..3bb5b84 100644
--- 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)
@@ -22,11 +24,13 @@ static inline void atmel_mpddr_op(const struct atmel_mpddr *mpddr,
 
 static int ddr2_decodtype_is_seq(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 *)ATMEL_BASE_MPDDRC;
+	u16 version = readl(&mpddr->version) & 0xffff;
+
+	if ((version >= SAMA5D3_MPDDRC_VERSION) &&
+	    (cr & ATMEL_MPDDRC_CR_DECOD_INTERLEAVED))
 		return 0;
-#endif
+
 	return 1;
 }
 
-- 
1.7.9.5