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powerpc/mpc8xxx: adjust DDR burst length and chop accroding to sdram width

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If the bus width is 32-bit, burst chop should be disabled and burst length
should be 8. Read from SPD or other source to determine the width.

Signed-off-by: York Sun <yorksun@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
York Sun 2011-05-27 07:25:48 +08:00 committed by Kumar Gala
parent 26fd33b9be
commit e090aa7cf0
1 changed files with 20 additions and 4 deletions
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24
arch/powerpc/cpu/mpc8xxx/ddr/options.c
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@ -418,8 +418,19 @@ unsigned int populate_memctl_options(int all_DIMMs_registered,
/* Choose dynamic power management mode. */
popts->dynamic_power = 0;
/* 0 = 64-bit, 1 = 32-bit, 2 = 16-bit */
popts->data_bus_width = 0;
/*
* check first dimm for primary sdram width
* presuming all dimms are similar
* 0 = 64-bit, 1 = 32-bit, 2 = 16-bit
*/
if (pdimm[0].primary_sdram_width == 64)
popts->data_bus_width = 0;
else if (pdimm[0].primary_sdram_width == 32)
popts->data_bus_width = 1;
else if (pdimm[0].primary_sdram_width == 16)
popts->data_bus_width = 2;
else
panic("Error: invalid primary sdram width!\n");
/* Choose burst length. */
#if defined(CONFIG_FSL_DDR3)
@ -427,8 +438,13 @@ 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
popts->OTF_burst_chop_en = 1; /* on-the-fly burst chop */
popts->burst_length = DDR_OTF; /* on-the-fly BC4 and BL8 */
if (popts->data_bus_width == 1) { /* 32-bit bus */
popts->OTF_burst_chop_en = 0;
popts->burst_length = DDR_BL8;
} else {
popts->OTF_burst_chop_en = 1; /* on-the-fly burst chop */
popts->burst_length = DDR_OTF; /* on-the-fly BC4 and BL8 */
}
#endif
#else
popts->burst_length = DDR_BL4; /* has to be 4 for DDR2 */