diff options
Diffstat (limited to 'arch/ppc/cpu/mpc8xxx/ddr/main.c')
| -rw-r--r-- | arch/ppc/cpu/mpc8xxx/ddr/main.c | 479 |
1 files changed, 479 insertions, 0 deletions
diff --git a/arch/ppc/cpu/mpc8xxx/ddr/main.c b/arch/ppc/cpu/mpc8xxx/ddr/main.c new file mode 100644 index 000000000..faa1af95e --- /dev/null +++ b/arch/ppc/cpu/mpc8xxx/ddr/main.c @@ -0,0 +1,479 @@ +/* + * 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. + */ + +/* + * Generic driver for Freescale DDR/DDR2/DDR3 memory controller. + * Based on code from spd_sdram.c + * Author: James Yang [at freescale.com] + */ + +#include <common.h> +#include <asm/fsl_ddr_sdram.h> + +#include "ddr.h" + +extern void fsl_ddr_set_lawbar( + const common_timing_params_t *memctl_common_params, + unsigned int memctl_interleaved, + unsigned int ctrl_num); + +/* processor specific function */ +extern void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs, + unsigned int ctrl_num); + +/* Board-specific functions defined in each board's ddr.c */ +extern void fsl_ddr_get_spd(generic_spd_eeprom_t *ctrl_dimms_spd, + unsigned int ctrl_num); + +/* + * ASSUMPTIONS: + * - Same number of CONFIG_DIMM_SLOTS_PER_CTLR on each controller + * - Same memory data bus width on all controllers + * + * NOTES: + * + * The memory controller and associated documentation use confusing + * terminology when referring to the orgranization of DRAM. + * + * Here is a terminology translation table: + * + * memory controller/documention |industry |this code |signals + * -------------------------------|-----------|-----------|----------------- + * physical bank/bank |rank |rank |chip select (CS) + * logical bank/sub-bank |bank |bank |bank address (BA) + * page/row |row |page |row address + * ??? |column |column |column address + * + * The naming confusion is further exacerbated by the descriptions of the + * memory controller interleaving feature, where accesses are interleaved + * _BETWEEN_ two seperate memory controllers. This is configured only in + * CS0_CONFIG[INTLV_CTL] of each memory controller. + * + * memory controller documentation | number of chip selects + * | per memory controller supported + * --------------------------------|----------------------------------------- + * cache line interleaving | 1 (CS0 only) + * page interleaving | 1 (CS0 only) + * bank interleaving | 1 (CS0 only) + * superbank interleraving | depends on bank (chip select) + * | interleraving [rank interleaving] + * | mode used on every memory controller + * + * Even further confusing is the existence of the interleaving feature + * _WITHIN_ each memory controller. The feature is referred to in + * documentation as chip select interleaving or bank interleaving, + * although it is configured in the DDR_SDRAM_CFG field. + * + * Name of field | documentation name | this code + * -----------------------------|-----------------------|------------------ + * DDR_SDRAM_CFG[BA_INTLV_CTL] | Bank (chip select) | rank interleaving + * | interleaving + */ + +#ifdef DEBUG +const char *step_string_tbl[] = { + "STEP_GET_SPD", + "STEP_COMPUTE_DIMM_PARMS", + "STEP_COMPUTE_COMMON_PARMS", + "STEP_GATHER_OPTS", + "STEP_ASSIGN_ADDRESSES", + "STEP_COMPUTE_REGS", + "STEP_PROGRAM_REGS", + "STEP_ALL" +}; + +const char * step_to_string(unsigned int step) { + + unsigned int s = __ilog2(step); + + if ((1 << s) != step) + return step_string_tbl[7]; + + return step_string_tbl[s]; +} +#endif + +int step_assign_addresses(fsl_ddr_info_t *pinfo, + unsigned int dbw_cap_adj[], + unsigned int *memctl_interleaving, + unsigned int *rank_interleaving) +{ + int i, j; + + /* + * If a reduced data width is requested, but the SPD + * specifies a physically wider device, adjust the + * computed dimm capacities accordingly before + * assigning addresses. + */ + for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) { + unsigned int found = 0; + + switch (pinfo->memctl_opts[i].data_bus_width) { + case 2: + /* 16-bit */ + printf("can't handle 16-bit mode yet\n"); + break; + + case 1: + /* 32-bit */ + for (j = 0; j < CONFIG_DIMM_SLOTS_PER_CTLR; j++) { + unsigned int dw; + dw = pinfo->dimm_params[i][j].data_width; + if (pinfo->dimm_params[i][j].n_ranks + && (dw == 72 || dw == 64)) { + /* + * FIXME: can't really do it + * like this because this just + * further reduces the memory + */ + found = 1; + break; + } + } + if (found) { + dbw_cap_adj[i] = 1; + } + break; + + case 0: + /* 64-bit */ + break; + + default: + printf("unexpected data bus width " + "specified controller %u\n", i); + return 1; + } + } + + /* + * Check if all controllers are configured for memory + * controller interleaving. + */ + j = 0; + for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) { + if (pinfo->memctl_opts[i].memctl_interleaving) { + j++; + } + } + if (j == 2) + *memctl_interleaving = 1; + + /* Check that all controllers are rank interleaving. */ + j = 0; + for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) { + if (pinfo->memctl_opts[i].ba_intlv_ctl) { + j++; + } + } + if (j == 2) + *rank_interleaving = 1; + + if (*memctl_interleaving) { + unsigned long long addr, total_mem_per_ctlr = 0; + /* + * If interleaving between memory controllers, + * make each controller start at a base address + * of 0. + * + * Also, if bank interleaving (chip select + * interleaving) is enabled on each memory + * controller, CS0 needs to be programmed to + * cover the entire memory range on that memory + * controller + * + * Bank interleaving also implies that each + * addressed chip select is identical in size. + */ + + for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) { + addr = 0; + pinfo->common_timing_params[i].base_address = 0ull; + for (j = 0; j < CONFIG_DIMM_SLOTS_PER_CTLR; j++) { + unsigned long long cap + = pinfo->dimm_params[i][j].capacity; + + pinfo->dimm_params[i][j].base_address = addr; + addr += cap >> dbw_cap_adj[i]; + total_mem_per_ctlr += cap >> dbw_cap_adj[i]; + } + } + pinfo->common_timing_params[0].total_mem = total_mem_per_ctlr; + } else { + /* + * Simple linear assignment if memory + * controllers are not interleaved. + */ + unsigned long long cur_memsize = 0; + for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) { + u64 total_mem_per_ctlr = 0; + pinfo->common_timing_params[i].base_address = + cur_memsize; + for (j = 0; j < CONFIG_DIMM_SLOTS_PER_CTLR; j++) { + /* Compute DIMM base addresses. */ + unsigned long long cap = + pinfo->dimm_params[i][j].capacity; + pinfo->dimm_params[i][j].base_address = + cur_memsize; + cur_memsize += cap >> dbw_cap_adj[i]; + total_mem_per_ctlr += cap >> dbw_cap_adj[i]; + } + pinfo->common_timing_params[i].total_mem = + total_mem_per_ctlr; + } + } + + return 0; +} + +unsigned long long +fsl_ddr_compute(fsl_ddr_info_t *pinfo, unsigned int start_step) +{ + unsigned int i, j; + unsigned int all_controllers_memctl_interleaving = 0; + unsigned int all_controllers_rank_interleaving = 0; + unsigned long long total_mem = 0; + + fsl_ddr_cfg_regs_t *ddr_reg = pinfo->fsl_ddr_config_reg; + common_timing_params_t *timing_params = pinfo->common_timing_params; + + /* data bus width capacity adjust shift amount */ + unsigned int dbw_capacity_adjust[CONFIG_NUM_DDR_CONTROLLERS]; + + for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) { + dbw_capacity_adjust[i] = 0; + } + + debug("starting at step %u (%s)\n", + start_step, step_to_string(start_step)); + + switch (start_step) { + case STEP_GET_SPD: + /* STEP 1: Gather all DIMM SPD data */ + for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) { + fsl_ddr_get_spd(pinfo->spd_installed_dimms[i], i); + } + + case STEP_COMPUTE_DIMM_PARMS: + /* STEP 2: Compute DIMM parameters from SPD data */ + + for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) { + for (j = 0; j < CONFIG_DIMM_SLOTS_PER_CTLR; j++) { + unsigned int retval; + generic_spd_eeprom_t *spd = + &(pinfo->spd_installed_dimms[i][j]); + dimm_params_t *pdimm = + &(pinfo->dimm_params[i][j]); + + retval = compute_dimm_parameters(spd, pdimm, i); + if (retval == 2) { + printf("Error: compute_dimm_parameters" + " non-zero returned FATAL value " + "for memctl=%u dimm=%u\n", i, j); + return 0; + } + if (retval) { + debug("Warning: compute_dimm_parameters" + " non-zero return value for memctl=%u " + "dimm=%u\n", i, j); + } + } + } + + case STEP_COMPUTE_COMMON_PARMS: + /* + * STEP 3: Compute a common set of timing parameters + * suitable for all of the DIMMs on each memory controller + */ + for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) { + debug("Computing lowest common DIMM" + " parameters for memctl=%u\n", i); + compute_lowest_common_dimm_parameters( + pinfo->dimm_params[i], + &timing_params[i], + CONFIG_DIMM_SLOTS_PER_CTLR); + } + + case STEP_GATHER_OPTS: + /* STEP 4: Gather configuration requirements from user */ + for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) { + debug("Reloading memory controller " + "configuration options for memctl=%u\n", i); + /* + * This "reloads" the memory controller options + * to defaults. If the user "edits" an option, + * next_step points to the step after this, + * which is currently STEP_ASSIGN_ADDRESSES. + */ + populate_memctl_options( + timing_params[i].all_DIMMs_registered, + &pinfo->memctl_opts[i], + pinfo->dimm_params[i], i); + } + + case STEP_ASSIGN_ADDRESSES: + /* STEP 5: Assign addresses to chip selects */ + step_assign_addresses(pinfo, + dbw_capacity_adjust, + &all_controllers_memctl_interleaving, + &all_controllers_rank_interleaving); + + case STEP_COMPUTE_REGS: + /* STEP 6: compute controller register values */ + debug("FSL Memory ctrl cg register computation\n"); + for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) { + if (timing_params[i].ndimms_present == 0) { + memset(&ddr_reg[i], 0, + sizeof(fsl_ddr_cfg_regs_t)); + continue; + } + + compute_fsl_memctl_config_regs( + &pinfo->memctl_opts[i], + &ddr_reg[i], &timing_params[i], + pinfo->dimm_params[i], + dbw_capacity_adjust[i]); + } + + default: + break; + } + + /* Compute the total amount of memory. */ + + /* + * If bank interleaving but NOT memory controller interleaving + * CS_BNDS describe the quantity of memory on each memory + * controller, so the total is the sum across. + */ + if (!all_controllers_memctl_interleaving + && all_controllers_rank_interleaving) { + total_mem = 0; + for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) { + total_mem += timing_params[i].total_mem; + } + + } else { + /* + * Compute the amount of memory available just by + * looking for the highest valid CSn_BNDS value. + * This allows us to also experiment with using + * only CS0 when using dual-rank DIMMs. + */ + unsigned int max_end = 0; + + for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) { + for (j = 0; j < CONFIG_CHIP_SELECTS_PER_CTRL; j++) { + fsl_ddr_cfg_regs_t *reg = &ddr_reg[i]; + if (reg->cs[j].config & 0x80000000) { + unsigned int end; + end = reg->cs[j].bnds & 0xFFF; + if (end > max_end) { + max_end = end; + } + } + } + } + + total_mem = 1 + (((unsigned long long)max_end << 24ULL) + | 0xFFFFFFULL); + } + + return total_mem; +} + +/* + * fsl_ddr_sdram() -- this is the main function to be called by + * initdram() in the board file. + * + * It returns amount of memory configured in bytes. + */ +phys_size_t fsl_ddr_sdram(void) +{ + unsigned int i; + unsigned int memctl_interleaved; + unsigned long long total_memory; + fsl_ddr_info_t info; + + /* Reset info structure. */ + memset(&info, 0, sizeof(fsl_ddr_info_t)); + + /* Compute it once normally. */ + total_memory = fsl_ddr_compute(&info, STEP_GET_SPD); + + /* Check for memory controller interleaving. */ + memctl_interleaved = 0; + for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) { + memctl_interleaved += + info.memctl_opts[i].memctl_interleaving; + } + + if (memctl_interleaved) { + if (memctl_interleaved == CONFIG_NUM_DDR_CONTROLLERS) { + debug("memctl interleaving\n"); + /* + * Change the meaning of memctl_interleaved + * to be "boolean". + */ + memctl_interleaved = 1; + } else { + printf("Warning: memctl interleaving not " + "properly configured on all controllers\n"); + memctl_interleaved = 0; + for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) + info.memctl_opts[i].memctl_interleaving = 0; + debug("Recomputing with memctl_interleaving off.\n"); + total_memory = fsl_ddr_compute(&info, + STEP_ASSIGN_ADDRESSES); + } + } + + /* Program configuration registers. */ + for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) { + debug("Programming controller %u\n", i); + if (info.common_timing_params[i].ndimms_present == 0) { + debug("No dimms present on controller %u; " + "skipping programming\n", i); + continue; + } + + fsl_ddr_set_memctl_regs(&(info.fsl_ddr_config_reg[i]), i); + } + + if (memctl_interleaved) { + const unsigned int ctrl_num = 0; + + /* Only set LAWBAR1 if memory controller interleaving is on. */ + fsl_ddr_set_lawbar(&info.common_timing_params[0], + memctl_interleaved, ctrl_num); + } else { + /* + * Memory controller interleaving is NOT on; + * set each lawbar individually. + */ + for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) { + fsl_ddr_set_lawbar(&info.common_timing_params[i], + 0, i); + } + } + + debug("total_memory = %llu\n", total_memory); + +#if !defined(CONFIG_PHYS_64BIT) + /* Check for 4G or more. Bad. */ + if (total_memory >= (1ull << 32)) { + printf("Detected %lld MB of memory\n", total_memory >> 20); + printf("This U-Boot only supports < 4G of DDR\n"); + printf("You could rebuild it with CONFIG_PHYS_64BIT\n"); + total_memory = CONFIG_MAX_MEM_MAPPED; + } +#endif + + return total_memory; +} |