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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2012 Google Inc.
* Copyright (C) 2013 Sage Electronic Engineering, LLC.
*
* 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 <console/console.h>
#include <arch/io.h>
#include <soc/iosf.h>
#include <soc/romstage.h>
#include <cpu/x86/msr.h>
#include <soc/msr.h>
#include <cpu/x86/name.h>
static void print_dram_info(void)
{
const int mrc_ver_reg = 0xf0;
const uint32_t soc_dev = PCI_DEV(0, SOC_DEV, SOC_FUNC);
uint32_t reg;
int num_channels;
int speed;
uint32_t ch0;
uint32_t ch1;
reg = pci_read_config32(soc_dev, mrc_ver_reg);
printk(BIOS_INFO, "MRC v%d.%02d\n", (reg >> 8) & 0xff, reg & 0xff);
/* Number of channels enabled and DDR3 type. Determine number of
* channels by the keying of the rank enable bits [3:0]. * */
ch0 = iosf_dunit_ch0_read(DRP);
ch1 = iosf_dunit_ch1_read(DRP);
num_channels = 0;
if (ch0 & DRP_RANK_MASK)
num_channels++;
if (ch1 & DRP_RANK_MASK)
num_channels++;
printk(BIOS_INFO, "%d channels of %sDDR3 @ ", num_channels,
(reg & (1 << 22)) ? "LP" : "");
/* DRAM frequency -- all channels run at same frequency. */
reg = iosf_dunit_read(DTR0);
switch (reg & 0x3) {
case 0:
speed = 800; break;
case 1:
speed = 1066; break;
case 2:
speed = 1333; break;
case 3:
speed = 1600; break;
}
printk(BIOS_INFO, "%dMHz\n", speed);
}
#define VARIANT_ID_BYTE 18
#define VARIANT_ID_MASK 7
void report_platform_info(void)
{
const char *baytrail_variants[4] = {
"Bay Trail-I (ISG/embedded)",
"Bay Trail-T (Tablet)",
"Bay Trail-D (Desktop)",
"Bay Trail-M (Mobile)",
};
msr_t platform_id = rdmsr(IA32_PLATFORM_ID);
uint8_t variant = (platform_id.hi >> VARIANT_ID_BYTE) & VARIANT_ID_MASK;
printk(BIOS_INFO, "Baytrail Chip Variant: %s\n", variant < 4 ?
baytrail_variants[variant] : "Unknown");
print_dram_info();
}
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