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 (file)
--- a/arch/cris/arch-v32/mach-a3/Kconfig
+++ b/arch/cris/arch-v32/mach-a3/Kconfig
@@ -33,6 +33,10 @@ config ETRAX_DDR2_CONFIG
        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 (file)
--- 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 @@ do_cmd:
        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 @@ do_cmd:
 
        ; 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 (file)
--- 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