From c9ffd839b1ada502c86f88edaf1534426b6688ce Mon Sep 17 00:00:00 2001 From: Haiying Wang Date: Fri, 3 Oct 2008 12:37:10 -0400 Subject: Check DDR interleaving mode * Check DDR interleaving mode from environment by reading memctl_intlv_ctl and ba_intlv_ctl. * Print DDR interleaving mode information * Add doc/README.fsl-ddr to describe the interleaving setting Signed-off-by: Haiying Wang --- cpu/mpc8xxx/ddr/options.c | 80 ++++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 75 insertions(+), 5 deletions(-) (limited to 'cpu/mpc8xxx/ddr/options.c') diff --git a/cpu/mpc8xxx/ddr/options.c b/cpu/mpc8xxx/ddr/options.c index 99b5685..714e88d 100644 --- a/cpu/mpc8xxx/ddr/options.c +++ b/cpu/mpc8xxx/ddr/options.c @@ -22,6 +22,7 @@ unsigned int populate_memctl_options(int all_DIMMs_registered, unsigned int ctrl_num) { unsigned int i; + const char *p; /* Chip select options. */ @@ -181,17 +182,86 @@ unsigned int populate_memctl_options(int all_DIMMs_registered, #error "FIXME determine four activates for DDR3" #endif - /* ODT should only be used for DDR2 */ - - /* FIXME? */ - /* - * Interleaving checks. + * Check interleaving configuration from environment. + * Please refer to doc/README.fsl-ddr for the detail. * * If memory controller interleaving is enabled, then the data * bus widths must be programmed identically for the 2 memory * controllers. + * + * XXX: Attempt to set both controllers to the same chip select + * interleaving mode. It will do a best effort to get the + * requested ranks interleaved together such that the result + * should be a subset of the requested configuration. */ + if ((p = getenv("memctl_intlv_ctl")) != NULL) { + if (pdimm[0].n_ranks == 0) { + printf("There is no rank on CS0. Because only rank on \ + CS0 and ranks chip-select interleaved with CS0\ + are controller interleaved, force non memory \ + controller interleaving\n"); + popts->memctl_interleaving = 0; + } else { + popts->memctl_interleaving = 1; + if (strcmp(p, "cacheline") == 0) + popts->memctl_interleaving_mode = + FSL_DDR_CACHE_LINE_INTERLEAVING; + else if (strcmp(p, "page") == 0) + popts->memctl_interleaving_mode = + FSL_DDR_PAGE_INTERLEAVING; + else if (strcmp(p, "bank") == 0) + popts->memctl_interleaving_mode = + FSL_DDR_BANK_INTERLEAVING; + else if (strcmp(p, "superbank") == 0) + popts->memctl_interleaving_mode = + FSL_DDR_SUPERBANK_INTERLEAVING; + else + popts->memctl_interleaving_mode = + simple_strtoul(p, NULL, 0); + } + } + + if( (p = getenv("ba_intlv_ctl")) != NULL) { + if (strcmp(p, "cs0_cs1") == 0) + popts->ba_intlv_ctl = FSL_DDR_CS0_CS1; + else if (strcmp(p, "cs2_cs3") == 0) + popts->ba_intlv_ctl = FSL_DDR_CS2_CS3; + else if (strcmp(p, "cs0_cs1_and_cs2_cs3") == 0) + popts->ba_intlv_ctl = FSL_DDR_CS0_CS1_AND_CS2_CS3; + else if (strcmp(p, "cs0_cs1_cs2_cs3") == 0) + popts->ba_intlv_ctl = FSL_DDR_CS0_CS1_CS2_CS3; + else + popts->ba_intlv_ctl = simple_strtoul(p, NULL, 0); + + switch (popts->ba_intlv_ctl & FSL_DDR_CS0_CS1_CS2_CS3) { + case FSL_DDR_CS0_CS1_CS2_CS3: + case FSL_DDR_CS0_CS1: + if (pdimm[0].n_ranks != 2) { + popts->ba_intlv_ctl = 0; + printf("No enough bank(chip-select) for \ + CS0+CS1, force non-interleaving!\n"); + } + break; + case FSL_DDR_CS2_CS3: + if (pdimm[1].n_ranks !=2){ + popts->ba_intlv_ctl = 0; + printf("No enough bank(CS) for CS2+CS3, \ + force non-interleaving!\n"); + } + break; + case FSL_DDR_CS0_CS1_AND_CS2_CS3: + if ((pdimm[0].n_ranks != 2)||(pdimm[1].n_ranks != 2)) { + popts->ba_intlv_ctl = 0; + printf("No enough bank(CS) for CS0+CS1 or \ + CS2+CS3, force non-interleaving!\n"); + } + break; + default: + popts->ba_intlv_ctl = 0; + break; + } + } fsl_ddr_board_options(popts, pdimm, ctrl_num); -- cgit v1.1