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authorMichael Barkowski <michael.barkowski@freescale.com>2008-03-20 13:15:34 -0400
committerKim Phillips <kim.phillips@freescale.com>2008-03-25 19:16:44 -0500
commit5bbeea86eb6afb872374cd23217cb3c1018443ed (patch)
tree788ab3805bc7a7198f9a106e9752e3c550449901 /cpu/mpc83xx/cpu_init.c
parentfc549c871f43933396a5b3e21d897023d4b31b8d (diff)
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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>
Diffstat (limited to 'cpu/mpc83xx/cpu_init.c')
-rw-r--r--cpu/mpc83xx/cpu_init.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/cpu/mpc83xx/cpu_init.c b/cpu/mpc83xx/cpu_init.c
index e643037..fba5b02 100644
--- a/cpu/mpc83xx/cpu_init.c
+++ b/cpu/mpc83xx/cpu_init.c
@@ -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) |