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powerpc/mpc8xxx: Enable calculation for fixed DDR chips

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We used to have fixed parameters for soldered DDR chips. This patch
introduces CONFIG_SYS_DDR_RAW_TIMING to enable calculation based on timing
data from DDR chip datasheet, implemneted in board-specific files or header
files.

Signed-off-by: York Sun <yorksun@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
York Sun 2011-06-07 09:42:16 +08:00 committed by Kumar Gala
parent aeb6716a12
commit 1b3e3c4f26
5 changed files with 39 additions and 3 deletions
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6
README
View File

@ -2948,6 +2948,12 @@ Low Level (hardware related) configuration options:
one, specify here. Note that the value must resolve
to something your driver can deal with.
- CONFIG_SYS_DDR_RAW_TIMING
Get DDR timing information from other than SPD. Common with
soldered DDR chips onboard without SPD. DDR raw timing
parameters are extracted from datasheet and hard-coded into
header files or board specific files.
- CONFIG_SYS_83XX_DDR_USES_CS0
Only for 83xx systems. If specified, then DDR should
be configured using CS0 and CS1 instead of CS2 and CS3.

4
arch/powerpc/cpu/mpc85xx/cpu.c
View File

@ -336,7 +336,9 @@ phys_size_t initdram(int board_type)
}
#endif
#if defined(CONFIG_SPD_EEPROM) || defined(CONFIG_DDR_SPD)
#if defined(CONFIG_SPD_EEPROM) || \
defined(CONFIG_DDR_SPD) || \
defined(CONFIG_SYS_DDR_RAW_TIMING)
dram_size = fsl_ddr_sdram();
#else
dram_size = fixed_sdram();

13
arch/powerpc/cpu/mpc8xxx/ddr/Makefile
View File

@ -12,15 +12,24 @@ LIB = $(obj)libddr.o
COBJS-$(CONFIG_FSL_DDR1) += main.o util.o ctrl_regs.o options.o \
lc_common_dimm_params.o
COBJS-$(CONFIG_FSL_DDR1) += ddr1_dimm_params.o
COBJS-$(CONFIG_FSL_DDR2) += main.o util.o ctrl_regs.o options.o \
lc_common_dimm_params.o
COBJS-$(CONFIG_FSL_DDR2) += ddr2_dimm_params.o
COBJS-$(CONFIG_FSL_DDR3) += main.o util.o ctrl_regs.o options.o \
lc_common_dimm_params.o
ifdef CONFIG_DDR_SPD
SPD := y
endif
ifdef CONFIG_SPD_EEPROM
SPD := y
endif
ifdef SPD
COBJS-$(CONFIG_FSL_DDR1) += ddr1_dimm_params.o
COBJS-$(CONFIG_FSL_DDR2) += ddr2_dimm_params.o
COBJS-$(CONFIG_FSL_DDR3) += ddr3_dimm_params.o
endif
SRCS := $(START:.o=.S) $(SOBJS-y:.o=.S) $(COBJS-y:.o=.c)
OBJS := $(addprefix $(obj),$(SOBJS-y) $(COBJS-y))

7
arch/powerpc/cpu/mpc8xxx/ddr/ddr.h
View File

@ -14,6 +14,7 @@
#include "common_timing_params.h"
#if defined(CONFIG_DDR_SPD) || defined(CONFIG_SPD_EEPROM)
/*
* Bind the main DDR setup driver's generic names
* to this specific DDR technology.
@ -25,6 +26,7 @@ compute_dimm_parameters(const generic_spd_eeprom_t *spd,
{
return ddr_compute_dimm_parameters(spd, pdimm, dimm_number);
}
#endif
/*
* Data Structures
@ -80,4 +82,9 @@ extern void check_interleaving_options(fsl_ddr_info_t *pinfo);
extern unsigned int mclk_to_picos(unsigned int mclk);
extern unsigned int get_memory_clk_period_ps(void);
extern unsigned int picos_to_mclk(unsigned int picos);
/* board specific function */
int fsl_ddr_get_dimm_params(dimm_params_t *pdimm,
unsigned int controller_number,
unsigned int dimm_number);
#endif

12
arch/powerpc/cpu/mpc8xxx/ddr/main.c
View File

@ -325,6 +325,7 @@ fsl_ddr_compute(fsl_ddr_info_t *pinfo, unsigned int start_step,
switch (start_step) {
case STEP_GET_SPD:
#if defined(CONFIG_DDR_SPD) || defined(CONFIG_SPD_EEPROM)
/* STEP 1: Gather all DIMM SPD data */
for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
fsl_ddr_get_spd(pinfo->spd_installed_dimms[i], i);
@ -356,6 +357,17 @@ fsl_ddr_compute(fsl_ddr_info_t *pinfo, unsigned int start_step,
}
}
#else
case STEP_COMPUTE_DIMM_PARMS:
for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
for (j = 0; j < CONFIG_DIMM_SLOTS_PER_CTLR; j++) {
dimm_params_t *pdimm =
&(pinfo->dimm_params[i][j]);
fsl_ddr_get_dimm_params(pdimm, i, j);
}
}
debug("Filling dimm parameters from board specific file\n");
#endif
case STEP_COMPUTE_COMMON_PARMS:
/*
* STEP 3: Compute a common set of timing parameters