CRIS: Add more delays in DDR setup
Also, make DDR latency configurable.
Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
diff --git a/arch/cris/arch-v32/mach-a3/Kconfig b/arch/cris/arch-v32/mach-a3/Kconfig
index a4df06d..7796aaf 100644
--- a/arch/cris/arch-v32/mach-a3/Kconfig
+++ b/arch/cris/arch-v32/mach-a3/Kconfig
@@ -33,6 +33,10 @@
hex "DDR2 config"
default "0"
+config ETRAX_DDR2_LATENCY
+ hex "DDR2 latency"
+ default "0"
+
config ETRAX_PIO_CE0_CFG
hex "PIO CE0 configuration"
default "0"
diff --git a/arch/cris/arch-v32/mach-a3/dram_init.S b/arch/cris/arch-v32/mach-a3/dram_init.S
index 94d6b41..ec8648b 100644
--- a/arch/cris/arch-v32/mach-a3/dram_init.S
+++ b/arch/cris/arch-v32/mach-a3/dram_init.S
@@ -24,11 +24,21 @@
;; Refer to ddr2 MDS for initialization sequence
+ ; 2. Wait 200us
+ move.d 10000, $r2
+1: bne 1b
+ subq 1, $r2
+
; Start clock
move.d REG_ADDR(ddr2, regi_ddr2_ctrl, rw_phy_cfg), $r0
move.d REG_STATE(ddr2, rw_phy_cfg, en, yes), $r1
move.d $r1, [$r0]
+ ; 2. Wait 200us
+ move.d 10000, $r2
+1: bne 1b
+ subq 1, $r2
+
; Reset phy and start calibration
move.d REG_ADDR(ddr2, regi_ddr2_ctrl, rw_phy_ctrl), $r0
move.d REG_STATE(ddr2, rw_phy_ctrl, rst, yes) | \
@@ -52,6 +62,10 @@
lslq 16, $r1
or.d $r3, $r1
move.d $r1, [$r0]
+ ; 2. Wait 200us
+ move.d 10000, $r4
+1: bne 1b
+ subq 1, $r4
cmp.d sdram_commands_end, $r2
blo command_loop
nop
@@ -63,7 +77,7 @@
; Set latency
move.d REG_ADDR(ddr2, regi_ddr2_ctrl, rw_latency), $r0
- move.d 0x13, $r1
+ move.d CONFIG_ETRAX_DDR2_LATENCY, $r1
move.d $r1, [$r0]
; Set configuration
diff --git a/arch/cris/arch-v32/mach-a3/hw_settings.S b/arch/cris/arch-v32/mach-a3/hw_settings.S
index 258a632..0145725 100644
--- a/arch/cris/arch-v32/mach-a3/hw_settings.S
+++ b/arch/cris/arch-v32/mach-a3/hw_settings.S
@@ -31,6 +31,8 @@
; Register values
.dword REG_ADDR(ddr2, regi_ddr2_ctrl, rw_cfg)
.dword CONFIG_ETRAX_DDR2_CONFIG
+ .dword REG_ADDR(ddr2, regi_ddr2_ctrl, rw_latency)
+ .dword CONFIG_ETRAX_DDR2_LATENCY
.dword REG_ADDR(ddr2, regi_ddr2_ctrl, rw_timing)
.dword CONFIG_ETRAX_DDR2_TIMING
.dword CONFIG_ETRAX_DDR2_MRS
