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Disable unused chip-select for DDR controller interleaving 

When DDR controller interleaving is eabled and less than all bank (chip-select)
interleaving is seletected, the unused chip-select should be disabled.

Signed-off-by: York Sun <yorksun@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
York Sun 2010-10-18 13:46:50 -07:00 committed by Kumar Gala
parent 28a966715b
commit 58edbc9caa
1 changed files with 14 additions and 3 deletions
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17
arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c
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@ -1184,6 +1184,7 @@ compute_fsl_memctl_config_regs(const memctl_options_t *popts,
unsigned int sr_it;
unsigned int zq_en;
unsigned int wrlvl_en;
int cs_en = 1;
memset(ddr, 0, sizeof(fsl_ddr_cfg_regs_t));
@ -1250,16 +1251,23 @@ compute_fsl_memctl_config_regs(const memctl_options_t *popts,
* and each controller uses rank interleaving within
* itself. Therefore the starting and ending address
* on each controller is twice the amount present on
* each controller.
* each controller. If any CS is not included in the
* interleaving, the memory on that CS is not accssible
* and the total memory size is reduced. The CS is also
* disabled.
*/
unsigned long long ctlr_density = 0;
switch (popts->ba_intlv_ctl & FSL_DDR_CS0_CS1_CS2_CS3) {
case FSL_DDR_CS0_CS1:
case FSL_DDR_CS0_CS1_AND_CS2_CS3:
ctlr_density = dimm_params[0].rank_density * 2;
if (i > 1)
cs_en = 0;
break;
case FSL_DDR_CS2_CS3:
ctlr_density = dimm_params[0].rank_density;
if (i > 0)
cs_en = 0;
break;
case FSL_DDR_CS0_CS1_CS2_CS3:
/*
@ -1379,8 +1387,11 @@ compute_fsl_memctl_config_regs(const memctl_options_t *popts,
);
debug("FSLDDR: cs[%d]_bnds = 0x%08x\n", i, ddr->cs[i].bnds);
set_csn_config(dimm_number, i, ddr, popts, dimm_params);
set_csn_config_2(i, ddr);
if (cs_en) {
set_csn_config(dimm_number, i, ddr, popts, dimm_params);
set_csn_config_2(i, ddr);
} else
printf("CS%d is disabled.\n", i);
}
set_ddr_eor(ddr, popts);