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/* SPDX-License-Identifier: GPL-2.0-only */
#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", 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",
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_form_factor form_factor)
{
/* This switch reverses the switch in smbios.c */
switch (form_factor) {
case MEMORY_FORMFACTOR_DIMM:
return SPD_UDIMM;
case MEMORY_FORMFACTOR_RIMM:
return SPD_RDIMM;
case MEMORY_FORMFACTOR_SODIMM:
return SPD_SODIMM;
default:
return SPD_UNDEFINED;
}
}
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