sunxi: DRAM initialisation for sun9i
This adds DRAM initialisation code for sun9i, which calculates the
appropriate timings based on timing information for the supplied
DDR3 bin and the clock speeds used.
With this DRAM setup, we have verified DDR3 clocks of up to 792MHz
(i.e. DDR3-1600) on the A80-Q7 using a dual-channel configuration.
[wens@csie.org: Moved dram_sun9i.c to arch/arm/mach-sunxi/; style cleanup]
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
[hdegoede@redhat.com: Drop some huge non-documenting #if 0 ... #endif blocks]
[hdegoede@redhat.com: Fix checkpatch warnings]
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
diff --git a/board/sunxi/Kconfig b/board/sunxi/Kconfig
index c0ffeb3..a126c3e 100644
--- a/board/sunxi/Kconfig
+++ b/board/sunxi/Kconfig
@@ -141,11 +141,13 @@
config DRAM_CLK
int "sunxi dram clock speed"
+ default 792 if MACH_SUN9I
default 312 if MACH_SUN6I || MACH_SUN8I
default 360 if MACH_SUN4I || MACH_SUN5I || MACH_SUN7I
---help---
- Set the dram clock speed, valid range 240 - 480, must be a multiple
- of 24.
+ Set the dram clock speed, valid range 240 - 480 (prior to sun9i),
+ must be a multiple of 24. For the sun9i (A80), the tested values
+ (for DDR3-1600) are 312 to 792.
if MACH_SUN5I || MACH_SUN7I
config DRAM_MBUS_CLK