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| author | Jesper Nilsson <jesper.nilsson@axis.com> | 2010-08-03 17:34:28 +0200 |
|---|---|---|
| committer | Jesper Nilsson <jesper.nilsson@axis.com> | 2010-08-04 13:02:30 +0200 |
| commit | 98560bd83e73b5c0cf38e3d984892f46a405a172 (patch) | |
| tree | 7ebd32772309f6ea50866b3fe7a9364ce3c77996 /arch/cris | |
| parent | 2d0503d1a6816e920e5b827bbe4eea7370c8130e (diff) | |
| download | lwn-98560bd83e73b5c0cf38e3d984892f46a405a172.tar.gz lwn-98560bd83e73b5c0cf38e3d984892f46a405a172.zip | |
CRIS: Add more delays in DDR setup
Also, make DDR latency configurable.
Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
Diffstat (limited to 'arch/cris')
| -rw-r--r-- | arch/cris/arch-v32/mach-a3/Kconfig | 4 | ||||
| -rw-r--r-- | arch/cris/arch-v32/mach-a3/dram_init.S | 16 | ||||
| -rw-r--r-- | arch/cris/arch-v32/mach-a3/hw_settings.S | 2 |
3 files changed, 21 insertions, 1 deletions
diff --git a/arch/cris/arch-v32/mach-a3/Kconfig b/arch/cris/arch-v32/mach-a3/Kconfig index a4df06d5997a..7796aafc711e 100644 --- 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 94d6b41cb299..ec8648be32d3 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 @@ 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 258a6329cd4a..0145725a1ce5 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 |