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powerpc/mpc8xxx: Add 16-bit support for DDR3 

Add support for 16-bit DDR bus. Also deal with system using 64- and 32-bit
DDR devices.

Signed-off-by: York Sun <yorksun@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
utp
York Sun 2011-05-27 07:25:51 +08:00 committed by Kumar Gala
parent d2246549c7
commit 51d498f175
3 changed files with 18 additions and 2 deletions
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14
arch/powerpc/cpu/mpc8xxx/ddr/main.c
View File

@ -174,7 +174,19 @@ int step_assign_addresses(fsl_ddr_info_t *pinfo,
switch (pinfo->memctl_opts[i].data_bus_width) {
case 2:
/* 16-bit */
printf("can't handle 16-bit mode yet\n");
for (j = 0; j < CONFIG_DIMM_SLOTS_PER_CTLR; j++) {
unsigned int dw;
if (!pinfo->dimm_params[i][j].n_ranks)
continue;
dw = pinfo->dimm_params[i][j].primary_sdram_width;
if ((dw == 72 || dw == 64)) {
dbw_cap_adj[i] = 2;
break;
} else if ((dw == 40 || dw == 32)) {
dbw_cap_adj[i] = 1;
break;
}
}
break;
case 1:

3
arch/powerpc/cpu/mpc8xxx/ddr/options.c
View File

@ -438,7 +438,8 @@ unsigned int populate_memctl_options(int all_DIMMs_registered,
popts->OTF_burst_chop_en = 0; /* on-the-fly burst chop disable */
popts->burst_length = DDR_BL8; /* Fixed 8-beat burst len */
#else
if (popts->data_bus_width == 1) { /* 32-bit bus */
if ((popts->data_bus_width == 1) || (popts->data_bus_width == 2)) {
/* 32-bit or 16-bit bus */
popts->OTF_burst_chop_en = 0;
popts->burst_length = DDR_BL8;
} else {

3
arch/powerpc/include/asm/fsl_ddr_sdram.h
View File

@ -181,6 +181,9 @@ typedef struct memctl_options_partial_s {
unsigned int all_DIMMs_minimum_tRCD_ps;
} memctl_options_partial_t;
#define DDR_DATA_BUS_WIDTH_64 0
#define DDR_DATA_BUS_WIDTH_32 1
#define DDR_DATA_BUS_WIDTH_16 2
/*
* Generalized parameters for memory controller configuration,
* might be a little specific to the FSL memory controller