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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2019 Facebook, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <cpu/x86/msr.h>
#include <soc/msr.h>
#include <stddef.h>
#include <device/pci_ops.h>
#include <device/dram/ddr4.h>
#include <soc/pci_devs.h>
#include <soc/memory.h>
#include <spd_bin.h>
#define MAX_SPD_READ_TRIES 3
static uint32_t get_memory_dclk(void)
{
uint32_t reg32 =
pci_mmio_read_config32(PCI_DEV(QPI_BUS, PCU1_DEV, PCU1_FUNC), REG_MC_BIOS_REQ);
return (reg32 & REG_MC_BIOS_REQ_FREQ_MSK) * REG_MC_MULTIPLIER;
}
void save_dimm_info(void)
{
int index = 0;
uint32_t dclk_mhz = 0, tries;
/*
* When talking to SPD chips through IMC slave offset of 0x50 is automagically added
* by hardware. Real-world slave numbers translate to: 0xa0, 0xa2, 0xa4, 0xa6.
*/
struct spd_block blk = {.addr_map = {SPD_SLAVE_ADDR(0, 0), SPD_SLAVE_ADDR(0, 1),
SPD_SLAVE_ADDR(1, 0), SPD_SLAVE_ADDR(1, 1)} };
get_spd_smbus(&blk);
dump_spd_info(&blk);
dclk_mhz = get_memory_dclk();
/*
* The platform is limited to 2 channels and max 2 dimms per channel.
* It doesn't look like DDR3 is supported so we assume memory is all DDR4.
*/
for (int channel = 0; channel < IMC_MAX_CHANNELS; channel++) {
for (int slot = 0; slot < CONFIG_DIMM_MAX / IMC_MAX_CHANNELS; slot++) {
dimm_attr dimm = {0};
u8 *spd_data = blk.spd_array[index];
int res = SPD_STATUS_OK;
tries = MAX_SPD_READ_TRIES;
/*
* SMBus controller can't validate data integrity. So on CRC
* error retry a few times.
*/
do {
res = spd_decode_ddr4(&dimm, spd_data);
if (res == SPD_STATUS_CRC_ERROR) {
printk(BIOS_ERR,
"SPD CRC error, channel %u slot %u "
"try %u\n", channel, slot, tries);
get_spd_smbus(&blk);
}
} while (tries-- && res == SPD_STATUS_CRC_ERROR);
index++;
if (res == SPD_STATUS_CRC_ERROR) {
printk(BIOS_WARNING, "Gave up reading CRC on channel %u"
" slot %u\n", channel, slot);
continue;
}
if (res == SPD_STATUS_OK) {
spd_add_smbios17_ddr4(channel, slot, dclk_mhz, &dimm);
}
}
}
}
bool memory_config_is_locked(void)
{
msr_t msr = rdmsr(MSR_LT_MEMORY_LOCKED);
return (msr.lo & (MSR_MEM_LOCK_BIT1 | MSR_MEM_LOCK_BIT2));
}
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