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mpc8323erdb: Improve the system performance 

The following changes are based on kernel UCC ethernet performance:

1.  Make the CSB bus pipeline depth as 4, and enable the repeat mode
2.  Optimize transactions between QE and CSB.  Added CFG_SPCR_OPT
    switch to enable this setting.

The following changes are based on the App Note AN3369 and
verified to improve memory latency using LMbench:

3.  CS0_CONFIG[AP_n_EN] is changed from 1 to 0
4.  CS0_CONFIG[ODT_WR_CONFIG] set to 1.  Was a reserved setting
    previously.
5.  TIMING_CFG_1[WRREC] is changed from 3clks to 2clks  (based on
    Twr=15ns, and this was already the setting in DDR_MODE)
6.  TIMING_CFG_1[PRETOACT] is changed from 3clks to 2clks. (based on
    Trp=15ns)
7.  TIMING_CFG_1[ACTTOPRE] is changed from 9clks to 6clks. (based on
    Tras=40ns)
8.  TIMING_CFG_1[ACTTORW] is changed from 3clks to 2clks. (based on
    Trcd=15ns)
9.  TIMING_CFG_1[REFREC] changed from 21 clks to 11clks.  (based on
    Trfc=75ns)
10. TIMING_CFG_2[FOUR_ACT] is changed from 10 clks to 7clks.  (based
    on Tfaw=50ns)
11. TIMING_CFG_2[ADD_LAT] and DDR_MODE[AL] changed from 0 to 1 (based
    on CL=3 and WL=2).

Signed-off-by: Michael Barkowski <michael.barkowski@freescale.com>
Acked-by: Kim Phillips <kim.phillips@freescale.com>
This commit is contained in:
Michael Barkowski 2008-03-20 13:15:34 -04:00 committed by Kim Phillips
parent fc549c871f
commit 5bbeea86eb
3 changed files with 28 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
cpu/mpc83xx/cpu_init.c
View File

@ -79,6 +79,12 @@ void cpu_init_f (volatile immap_t * im)
(CFG_ACR_RPTCNT << ACR_RPTCNT_SHIFT);
#endif
#ifdef CFG_SPCR_OPT
/* Optimize transactions between CSB and other devices */
im->sysconf.spcr = (im->sysconf.spcr & ~SPCR_OPT) |
(CFG_SPCR_OPT << SPCR_OPT_SHIFT);
#endif
#ifdef CFG_SPCR_TSECEP
/* all eTSEC's Emergency priority */
im->sysconf.spcr = (im->sysconf.spcr & ~SPCR_TSECEP) |

35
include/configs/MPC8323ERDB.h
View File

@ -65,6 +65,13 @@
*/
#define CFG_IMMR 0xE0000000
/*
* System performance
*/
#define CFG_ACR_PIPE_DEP 3 /* Arbiter pipeline depth (0-3) */
#define CFG_ACR_RPTCNT 3 /* Arbiter repeat count (0-7) */
#define CFG_SPCR_OPT 1 /* (0-1) Optimize transactions between CSB and the SEC and QUICC Engine block */
/*
* DDR Setup
*/
@ -83,10 +90,9 @@
*/
#define CFG_DDR_SIZE 64 /* MB */
#define CFG_DDR_CS0_CONFIG ( CSCONFIG_EN \
| CSCONFIG_AP \
| 0x00040000 /* TODO */ \
| CSCONFIG_ODT_WR_ACS \
| CSCONFIG_ROW_BIT_13 | CSCONFIG_COL_BIT_9 )
/* 0x80840101 */
/* 0x80010101 */
#define CFG_DDR_TIMING_0 ( ( 0 << TIMING_CFG0_RWT_SHIFT ) \
| ( 0 << TIMING_CFG0_WRT_SHIFT ) \
| ( 0 << TIMING_CFG0_RRT_SHIFT ) \
@ -96,28 +102,29 @@
| ( 8 << TIMING_CFG0_ODT_PD_EXIT_SHIFT ) \
| ( 2 << TIMING_CFG0_MRS_CYC_SHIFT ) )
/* 0x00220802 */
#define CFG_DDR_TIMING_1 ( ( 3 << TIMING_CFG1_PRETOACT_SHIFT ) \
| ( 9 << TIMING_CFG1_ACTTOPRE_SHIFT ) \
| ( 3 << TIMING_CFG1_ACTTORW_SHIFT ) \
#define CFG_DDR_TIMING_1 ( ( 2 << TIMING_CFG1_PRETOACT_SHIFT ) \
| ( 6 << TIMING_CFG1_ACTTOPRE_SHIFT ) \
| ( 2 << TIMING_CFG1_ACTTORW_SHIFT ) \
| ( 5 << TIMING_CFG1_CASLAT_SHIFT ) \
| (13 << TIMING_CFG1_REFREC_SHIFT ) \
| ( 3 << TIMING_CFG1_WRREC_SHIFT ) \
| ( 3 << TIMING_CFG1_REFREC_SHIFT ) \
| ( 2 << TIMING_CFG1_WRREC_SHIFT ) \
| ( 2 << TIMING_CFG1_ACTTOACT_SHIFT ) \
| ( 2 << TIMING_CFG1_WRTORD_SHIFT ) )
/* 0x3935d322 */
#define CFG_DDR_TIMING_2 ( (31 << TIMING_CFG2_CPO_SHIFT ) \
/* 0x26253222 */
#define CFG_DDR_TIMING_2 ( ( 1 << TIMING_CFG2_ADD_LAT_SHIFT ) \
| (31 << TIMING_CFG2_CPO_SHIFT ) \
| ( 2 << TIMING_CFG2_WR_LAT_DELAY_SHIFT ) \
| ( 2 << TIMING_CFG2_RD_TO_PRE_SHIFT ) \
| ( 2 << TIMING_CFG2_WR_DATA_DELAY_SHIFT ) \
| ( 3 << TIMING_CFG2_CKE_PLS_SHIFT ) \
| (10 << TIMING_CFG2_FOUR_ACT_SHIFT) )
/* 0x0f9048ca */
| ( 7 << TIMING_CFG2_FOUR_ACT_SHIFT) )
/* 0x1f9048c7 */
#define CFG_DDR_TIMING_3 0x00000000
#define CFG_DDR_CLK_CNTL DDR_SDRAM_CLK_CNTL_CLK_ADJUST_05
/* 0x02000000 */
#define CFG_DDR_MODE ( ( 0x4440 << SDRAM_MODE_ESD_SHIFT ) \
#define CFG_DDR_MODE ( ( 0x4448 << SDRAM_MODE_ESD_SHIFT ) \
| ( 0x0232 << SDRAM_MODE_SD_SHIFT ) )
/* 0x44400232 */
/* 0x44480232 */
#define CFG_DDR_MODE2 0x8000c000
#define CFG_DDR_INTERVAL ( ( 800 << SDRAM_INTERVAL_REFINT_SHIFT ) \
| ( 100 << SDRAM_INTERVAL_BSTOPRE_SHIFT ) )

1
include/mpc83xx.h
View File

@ -121,6 +121,7 @@
#define SPCR_PCIPR 0x03000000 /* PCI bridge system bus request priority */
#define SPCR_PCIPR_SHIFT (31-7)
#define SPCR_OPT 0x00800000 /* Optimize */
#define SPCR_OPT_SHIFT (31-8)
#define SPCR_TBEN 0x00400000 /* E300 PowerPC core time base unit enable */
#define SPCR_TBEN_SHIFT (31-9)
#define SPCR_COREPR 0x00300000 /* E300 PowerPC Core system bus request priority */