/* SPDX-License-Identifier: GPL-2.0-only */ #include <device/dram/spd.h> #include <dimm_info_util.h> #include <smbios.h> #include <spd.h> #include <console/console.h> uint8_t smbios_bus_width_to_spd_width(uint8_t ddr_type, uint16_t total_width, uint16_t data_width) { uint8_t out; /* Lookup table as defined in the JEDEC Standard. */ switch (data_width) { case 64: out = MEMORY_BUS_WIDTH_64; break; case 32: out = MEMORY_BUS_WIDTH_32; break; case 16: out = MEMORY_BUS_WIDTH_16; break; case 8: out = MEMORY_BUS_WIDTH_8; break; default: printk(BIOS_NOTICE, "Unknown memory size %hu\n", data_width); /* * The SMBIOS spec says we should set 0xFFFF on an unknown * value, but we don't have a way of passing that signal via SPD * encoded values. */ out = MEMORY_BUS_WIDTH_8; break; } uint16_t extension_bits = total_width - data_width; switch (extension_bits) { case 8: if (ddr_type == MEMORY_TYPE_DDR5 || ddr_type == MEMORY_TYPE_LPDDR5) out |= SPD_ECC_8BIT_LP5_DDR5; else out |= SPD_ECC_8BIT; break; case 0: /* No extension bits */ break; default: printk(BIOS_NOTICE, "Unknown number of extension bits %hu\n", extension_bits); break; } return out; } uint32_t smbios_memory_size_to_mib(uint16_t memory_size, uint32_t extended_size) { /* Memory size is unknown */ if (memory_size == 0xFFFF) return 0; /* (32 GiB - 1 MiB) or greater is expressed in the extended size. */ else if (memory_size == 0x7FFF) return extended_size; /* When the MSB is flipped, the value is specified in kilobytes */ else if (memory_size & 0x8000) return (memory_size ^ 0x8000) / KiB; /* Value contains MiB */ else return memory_size; } uint8_t smbios_form_factor_to_spd_mod_type(smbios_memory_type memory_type, smbios_memory_form_factor form_factor) { return convert_form_factor_to_module_type(memory_type, form_factor); }