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authorDave Liu <daveliu@freescale.com>2010-03-05 12:22:00 +0800
committerKumar Gala <galak@kernel.crashing.org>2010-04-07 00:07:23 -0500
commitec145e87b80f6764d17a6b0aebf521fe758c3fdc (patch)
tree41e5ea01cfc6d023c4789bdf759f447c7cc43dad /cpu
parentab467c512e79dbd14f02352655f054a4304c457e (diff)
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fsl-ddr: Fix the turnaround timing for TIMING_CFG_4
Read-to-read/Write-to-write turnaround for same chip select of DDR3 memory, BL/2+2 cycles is enough for them at BC4 and OTF case, BL/2 cycles is enough for fixed BL8. Cutting down the turnaround from BL/2+4 to BL/2+2 or BL/2 will improve the memory performance. Signed-off-by: Dave Liu <daveliu@freescale.com>
Diffstat (limited to 'cpu')
-rw-r--r--cpu/mpc8xxx/ddr/ctrl_regs.c26
1 files changed, 17 insertions, 9 deletions
diff --git a/cpu/mpc8xxx/ddr/ctrl_regs.c b/cpu/mpc8xxx/ddr/ctrl_regs.c
index adc4f6e..03f9c43 100644
--- a/cpu/mpc8xxx/ddr/ctrl_regs.c
+++ b/cpu/mpc8xxx/ddr/ctrl_regs.c
@@ -1,9 +1,10 @@
/*
- * Copyright 2008-2009 Freescale Semiconductor, Inc.
+ * Copyright 2008-2010 Freescale Semiconductor, Inc.
*
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * Version 2 as published by the Free Software Foundation.
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
*/
/*
@@ -934,7 +935,8 @@ static void set_ddr_init_ext_addr(fsl_ddr_cfg_regs_t *ddr)
}
/* DDR SDRAM Timing Configuration 4 (TIMING_CFG_4) */
-static void set_timing_cfg_4(fsl_ddr_cfg_regs_t *ddr)
+static void set_timing_cfg_4(fsl_ddr_cfg_regs_t *ddr,
+ const memctl_options_t *popts)
{
unsigned int rwt = 0; /* Read-to-write turnaround for same CS */
unsigned int wrt = 0; /* Write-to-read turnaround for same CS */
@@ -943,9 +945,15 @@ static void set_timing_cfg_4(fsl_ddr_cfg_regs_t *ddr)
unsigned int dll_lock = 0; /* DDR SDRAM DLL Lock Time */
#if defined(CONFIG_FSL_DDR3)
- /* We need set BL/2 + 4 for BC4 or OTF */
- rrt = 4; /* BL/2 + 4 clocks */
- wwt = 4; /* BL/2 + 4 clocks */
+ if (popts->burst_length == DDR_BL8) {
+ /* We set BL/2 for fixed BL8 */
+ rrt = 0; /* BL/2 clocks */
+ wwt = 0; /* BL/2 clocks */
+ } else {
+ /* We need to set BL/2 + 2 to BC4 and OTF */
+ rrt = 2; /* BL/2 + 2 clocks */
+ wwt = 2; /* BL/2 + 2 clocks */
+ }
dll_lock = 1; /* tDLLK = 512 clocks from spec */
#endif
ddr->timing_cfg_4 = (0
@@ -1343,7 +1351,7 @@ compute_fsl_memctl_config_regs(const memctl_options_t *popts,
set_ddr_sdram_clk_cntl(ddr, popts);
set_ddr_init_addr(ddr);
set_ddr_init_ext_addr(ddr);
- set_timing_cfg_4(ddr);
+ set_timing_cfg_4(ddr, popts);
set_timing_cfg_5(ddr);
set_ddr_zq_cntl(ddr, zq_en);