/* * Copyright 2008 Freescale Semiconductor, Inc. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * Version 2 as published by the Free Software Foundation. */ #include #include #include "ddr.h" /* Board-specific functions defined in each board's ddr.c */ extern void fsl_ddr_board_options(memctl_options_t *popts, unsigned int ctrl_num); unsigned int populate_memctl_options(int all_DIMMs_registered, memctl_options_t *popts, unsigned int ctrl_num) { unsigned int i; /* Chip select options. */ /* Pick chip-select local options. */ for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) { /* If not DDR2, odt_rd_cfg and odt_wr_cfg need to be 0. */ /* only for single CS? */ popts->cs_local_opts[i].odt_rd_cfg = 0; popts->cs_local_opts[i].odt_wr_cfg = 1; popts->cs_local_opts[i].auto_precharge = 0; } /* Pick interleaving mode. */ /* * 0 = no interleaving * 1 = interleaving between 2 controllers */ popts->memctl_interleaving = 0; /* * 0 = cacheline * 1 = page * 2 = (logical) bank * 3 = superbank (only if CS interleaving is enabled) */ popts->memctl_interleaving_mode = 0; /* * 0: cacheline: bit 30 of the 36-bit physical addr selects the memctl * 1: page: bit to the left of the column bits selects the memctl * 2: bank: bit to the left of the bank bits selects the memctl * 3: superbank: bit to the left of the chip select selects the memctl * * NOTE: ba_intlv (rank interleaving) is independent of memory * controller interleaving; it is only within a memory controller. * Must use superbank interleaving if rank interleaving is used and * memory controller interleaving is enabled. */ /* * 0 = no * 0x40 = CS0,CS1 * 0x20 = CS2,CS3 * 0x60 = CS0,CS1 + CS2,CS3 * 0x04 = CS0,CS1,CS2,CS3 */ popts->ba_intlv_ctl = 0; /* Memory Organization Parameters */ popts->registered_dimm_en = all_DIMMs_registered; /* Operational Mode Paramters */ /* Pick ECC modes */ #ifdef CONFIG_DDR_ECC popts->ECC_mode = 1; /* 0 = disabled, 1 = enabled */ #else popts->ECC_mode = 0; /* 0 = disabled, 1 = enabled */ #endif popts->ECC_init_using_memctl = 1; /* 0 = use DMA, 1 = use memctl */ /* * Choose DQS config * 0 for DDR1 * 1 for DDR2 */ #if defined(CONFIG_FSL_DDR1) popts->DQS_config = 0; #elif defined(CONFIG_FSL_DDR2) popts->DQS_config = 1; #else #error "Fix DQS for DDR3" #endif /* Choose self-refresh during sleep. */ popts->self_refresh_in_sleep = 1; /* Choose dynamic power management mode. */ popts->dynamic_power = 0; /* 0 = 64-bit, 1 = 32-bit, 2 = 16-bit */ popts->data_bus_width = 0; /* Choose burst length. */ popts->burst_length = 4; /* has to be 4 for DDR2 */ /* Global Timing Parameters. */ debug("mclk_ps = %u ps\n", get_memory_clk_period_ps()); /* Pick a caslat override. */ popts->cas_latency_override = 0; popts->cas_latency_override_value = 3; if (popts->cas_latency_override) { debug("using caslat override value = %u\n", popts->cas_latency_override_value); } /* Decide whether to use the computed derated latency */ popts->use_derated_caslat = 0; /* Choose an additive latency. */ popts->additive_latency_override = 0; popts->additive_latency_override_value = 3; if (popts->additive_latency_override) { debug("using additive latency override value = %u\n", popts->additive_latency_override_value); } /* * 2T_EN setting * * Factors to consider for 2T_EN: * - number of DIMMs installed * - number of components, number of active ranks * - how much time you want to spend playing around */ popts->twoT_en = 1; popts->threeT_en = 0; /* * BSTTOPRE precharge interval * * Set this to 0 for global auto precharge * * FIXME: Should this be configured in picoseconds? * Why it should be in ps: better understanding of this * relative to actual DRAM timing parameters such as tRAS. * e.g. tRAS(min) = 40 ns */ popts->bstopre = 0x100; /* Minimum CKE pulse width -- tCKE(MIN) */ popts->tCKE_clock_pulse_width_ps = mclk_to_picos(FSL_DDR_MIN_TCKE_PULSE_WIDTH_DDR); /* * Window for four activates -- tFAW * * FIXME: UM: applies only to DDR2/DDR3 with eight logical banks only * FIXME: varies depending upon number of column addresses or data * FIXME: width, was considering looking at pdimm->primary_sdram_width */ #if defined(CONFIG_FSL_DDR1) popts->tFAW_window_four_activates_ps = mclk_to_picos(1); #elif defined(CONFIG_FSL_DDR2) /* * x4/x8; some datasheets have 35000 * x16 wide columns only? Use 50000? */ popts->tFAW_window_four_activates_ps = 37500; #elif defined(CONFIG_FSL_DDR3) #error "FIXME determine four activates for DDR3" #endif /* ODT should only be used for DDR2 */ /* FIXME? */ /* * Interleaving checks. * * If memory controller interleaving is enabled, then the data * bus widths must be programmed identically for the 2 memory * controllers. */ fsl_ddr_board_options(popts, ctrl_num); return 0; }