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driver/ddr/fsl: Add support of overriding chip select write leveling

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JEDEC spec allows DRAM vendors to use prime DQ for write leveling. This
is not an issue unless some DQ pins are not connected. If a platform uses
regular DIMMs but with reduced DDR ECC pins, the prime DQ may end up on
those floating pins for the second rank. The workaround is to use a known
good chip select for this purpose.

Signed-off-by: York Sun <yorksun@freescale.com>
This commit is contained in:
York Sun 2014-09-05 13:52:43 +08:00
parent 5cb27c5d44
commit ef87cab664
3 changed files with 7 additions and 0 deletions
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3
drivers/ddr/fsl/ctrl_regs.c
View File

@ -2276,6 +2276,9 @@ compute_fsl_memctl_config_regs(const memctl_options_t *popts,
if (ip_rev > 0x40400)
unq_mrs_en = 1;
if (ip_rev > 0x40700)
ddr->debug[18] = popts->cswl_override;
set_ddr_sdram_cfg_2(ddr, popts, unq_mrs_en);
set_ddr_sdram_mode(ddr, popts, common_dimm,
cas_latency, additive_latency, unq_mrs_en);

2
drivers/ddr/fsl/interactive.c
View File

@ -511,6 +511,7 @@ static void fsl_ddr_options_edit(fsl_ddr_info_t *pinfo,
CTRL_OPTIONS(wrlvl_override),
CTRL_OPTIONS(wrlvl_sample),
CTRL_OPTIONS(wrlvl_start),
CTRL_OPTIONS(cswl_override),
CTRL_OPTIONS(rcw_override),
CTRL_OPTIONS(rcw_1),
CTRL_OPTIONS(rcw_2),
@ -801,6 +802,7 @@ static void print_memctl_options(const memctl_options_t *popts)
CTRL_OPTIONS(wrlvl_override),
CTRL_OPTIONS(wrlvl_sample),
CTRL_OPTIONS(wrlvl_start),
CTRL_OPTIONS_HEX(cswl_override),
CTRL_OPTIONS(rcw_override),
CTRL_OPTIONS(rcw_1),
CTRL_OPTIONS(rcw_2),

2
include/fsl_ddr_sdram.h
View File

@ -281,6 +281,7 @@ typedef struct memctl_options_partial_s {
#define DDR_DATA_BUS_WIDTH_64 0
#define DDR_DATA_BUS_WIDTH_32 1
#define DDR_DATA_BUS_WIDTH_16 2
#define DDR_CSWL_CS0 0x04000001
/*
* Generalized parameters for memory controller configuration,
* might be a little specific to the FSL memory controller
@ -340,6 +341,7 @@ typedef struct memctl_options_s {
unsigned int cpo_override;
unsigned int write_data_delay; /* DQS adjust */
unsigned int cswl_override;
unsigned int wrlvl_override;
unsigned int wrlvl_sample; /* Write leveling */
unsigned int wrlvl_start;