diff options
| author | York Sun | 2011-06-27 13:35:25 -0700 |
|---|---|---|
| committer | Kumar Gala | 2011-07-11 13:24:20 -0500 |
| commit | 4c99cb9190358e11ad96ba95b38d1e83cc053b46 (patch) | |
| tree | cccb23d6a1c90aaa2dc6aa8a654fae14345b8779 /arch/powerpc/cpu | |
| parent | f2d264b6603239d6d214c4e2faf17dde64cf81e2 (diff) | |
powerpc/mpc8xxx: fix DDR data width checking
Checking width before setting DDR controller. SPD for DDR1 and DDR2 has
data width and primary sdram width. The latter one has different meaning
for DDR3.
Signed-off-by: York Sun <yorksun@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/cpu')
| -rw-r--r-- | arch/powerpc/cpu/mpc8xxx/ddr/options.c | 35 |
1 files changed, 27 insertions, 8 deletions
diff --git a/arch/powerpc/cpu/mpc8xxx/ddr/options.c b/arch/powerpc/cpu/mpc8xxx/ddr/options.c index 02efe58b703..bd9c4663e79 100644 --- a/arch/powerpc/cpu/mpc8xxx/ddr/options.c +++ b/arch/powerpc/cpu/mpc8xxx/ddr/options.c @@ -423,14 +423,33 @@ unsigned int populate_memctl_options(int all_DIMMs_registered, * 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"); +#if defined(CONFIG_FSL_DDR1) || defined(CONFIG_FSL_DDR2) + if (pdimm[0].n_ranks != 0) { + if ((pdimm[0].data_width >= 64) && \ + (pdimm[0].data_width <= 72)) + popts->data_bus_width = 0; + else if ((pdimm[0].data_width >= 32) || \ + (pdimm[0].data_width <= 40)) + popts->data_bus_width = 1; + else { + panic("Error: data width %u is invalid!\n", + pdimm[0].data_width); + } + } +#else + if (pdimm[0].n_ranks != 0) { + 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: primary sdram width %u is invalid!\n", + pdimm[0].primary_sdram_width); + } + } +#endif /* Choose burst length. */ #if defined(CONFIG_FSL_DDR3) |