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powerpc/8xxx: Improvement to DDR parameters

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Changes for P2020DS DDR applies to other 8xxx platform

Signed-off-by: York Sun <yorksun@freescale.com>
This commit is contained in:
york 2010-07-02 22:25:56 +00:00 committed by Kumar Gala
parent 9490ff4864
commit 5fb8a8a731
2 changed files with 8 additions and 7 deletions
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14
arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c
View File

@ -199,7 +199,7 @@ static void set_timing_cfg_0(fsl_ddr_cfg_regs_t *ddr)
unsigned char act_pd_exit_mclk;
/* Precharge powerdown exit timing (tXP). */
unsigned char pre_pd_exit_mclk;
/* Precharge powerdown exit timing (tAXPD). */
/* ODT powerdown exit timing (tAXPD). */
unsigned char taxpd_mclk;
/* Mode register set cycle time (tMRD). */
unsigned char tmrd_mclk;
@ -211,13 +211,13 @@ static void set_timing_cfg_0(fsl_ddr_cfg_regs_t *ddr)
* we use the tXP instead of it.
* tXP=max(3nCK, 7.5ns) for DDR3.
* spec has not the tAXPD, we use
* tAXPD=8, need design to confirm.
* tAXPD=1, need design to confirm.
*/
int tXP = max((get_memory_clk_period_ps() * 3), 7500); /* unit=ps */
act_pd_exit_mclk = picos_to_mclk(tXP);
/* Mode register MR0[A12] is '1' - fast exit */
pre_pd_exit_mclk = act_pd_exit_mclk;
taxpd_mclk = 8;
taxpd_mclk = 1;
tmrd_mclk = 4;
/* set the turnaround time */
trwt_mclk = 1;
@ -1031,9 +1031,9 @@ static void set_timing_cfg_5(fsl_ddr_cfg_regs_t *ddr)
unsigned int wodt_off = 0; /* Write to ODT off */
#if defined(CONFIG_FSL_DDR3)
rodt_on = 3; /* 2 clocks */
rodt_on = 2; /* 2 clocks */
rodt_off = 4; /* 4 clocks */
wodt_on = 2; /* 1 clocks */
wodt_on = 1; /* 1 clocks */
wodt_off = 4; /* 4 clocks */
#endif
@ -1106,9 +1106,9 @@ static void set_ddr_wrlvl_cntl(fsl_ddr_cfg_regs_t *ddr, unsigned int wrlvl_en,
/*
* Write leveling repetition time
* at least tWLO + 6 clocks clocks
* we set it 32
* we set it 64
*/
wrlvl_wlr = 0x5;
wrlvl_wlr = 0x6;
/*
* Write leveling start time
* The value use for the DQS_ADJUST for the first sample

1
arch/powerpc/cpu/mpc8xxx/ddr/options.c
View File

@ -204,6 +204,7 @@ unsigned int populate_memctl_options(int all_DIMMs_registered,
* meet the tQDSS under different loading.
*/
popts->wrlvl_en = 1;
popts->zq_en = 1;
popts->wrlvl_override = 0;
#endif