It may be different settings of Rtt_nom and Rtt_WR for different boards, adding the override provide the capability.
Signed-off-by: Dave Liu daveliu@freescale.com --- cpu/mpc8xxx/ddr/ctrl_regs.c | 10 +++++++--- include/asm-ppc/fsl_ddr_sdram.h | 1 + 2 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/cpu/mpc8xxx/ddr/ctrl_regs.c b/cpu/mpc8xxx/ddr/ctrl_regs.c index 5f0c611..9c85608 100644 --- a/cpu/mpc8xxx/ddr/ctrl_regs.c +++ b/cpu/mpc8xxx/ddr/ctrl_regs.c @@ -576,18 +576,22 @@ static void set_ddr_sdram_cfg_2(fsl_ddr_cfg_regs_t *ddr, }
/* DDR SDRAM Mode configuration 2 (DDR_SDRAM_MODE_2) */ -static void set_ddr_sdram_mode_2(fsl_ddr_cfg_regs_t *ddr) +static void set_ddr_sdram_mode_2(fsl_ddr_cfg_regs_t *ddr, + const memctl_options_t *popts) { unsigned short esdmode2 = 0; /* Extended SDRAM mode 2 */ unsigned short esdmode3 = 0; /* Extended SDRAM mode 3 */
#if defined(CONFIG_FSL_DDR3) - unsigned int rtt_wr = 2; /* 120 ohm Rtt_WR */ + unsigned int rtt_wr = 0; /* Rtt_WR - dynamic ODT off */ unsigned int srt = 0; /* self-refresh temerature, normal range */ unsigned int asr = 0; /* auto self-refresh disable */ unsigned int cwl = compute_cas_write_latency() - 5; unsigned int pasr = 0; /* partial array self refresh disable */
+ if (popts->rtt_override) + rtt_wr = popts->rtt_wr_override_value; + esdmode2 = (0 | ((rtt_wr & 0x3) << 9) | ((srt & 0x1) << 7) @@ -1332,7 +1336,7 @@ compute_fsl_memctl_config_regs(const memctl_options_t *popts, set_ddr_sdram_cfg_2(ddr, popts); set_ddr_sdram_mode(ddr, popts, common_dimm, cas_latency, additive_latency); - set_ddr_sdram_mode_2(ddr); + set_ddr_sdram_mode_2(ddr, popts); set_ddr_sdram_interval(ddr, popts, common_dimm); set_ddr_data_init(ddr); set_ddr_sdram_clk_cntl(ddr, popts); diff --git a/include/asm-ppc/fsl_ddr_sdram.h b/include/asm-ppc/fsl_ddr_sdram.h index d978d70..2bdf896 100644 --- a/include/asm-ppc/fsl_ddr_sdram.h +++ b/include/asm-ppc/fsl_ddr_sdram.h @@ -192,6 +192,7 @@ typedef struct memctl_options_s { /* Rtt impedance */ unsigned int rtt_override; /* rtt_override enable */ unsigned int rtt_override_value; /* that is Rtt_Nom for DDR3 */ + unsigned int rtt_wr_override_value; /* this is Rtt_WR for DDR3 */
/* Automatic self refresh */ unsigned int auto_self_refresh_en;