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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2007-2008 coresystems GmbH
* Copyright (C) 2016 Arthur Heymans arthur@aheymans.xyz
* Copyright (C) 2016 Kyösti Mälkki <kyosti.malkki@gmail.com>
*
* 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 <stdint.h>
#include <cf9_reset.h>
#include <device/pnp_ops.h>
#include <device/pci_ops.h>
#include <device/pci_def.h>
#include <cpu/x86/lapic.h>
#include <superio/winbond/common/winbond.h>
#include <superio/winbond/w83627dhg/w83627dhg.h>
#include <console/console.h>
#include <arch/romstage.h>
#include <northbridge/intel/i945/i945.h>
#include <northbridge/intel/i945/raminit.h>
#include <southbridge/intel/i82801gx/i82801gx.h>
#include <southbridge/intel/common/pmclib.h>
#include <cpu/x86/msr.h>
#include <cpu/intel/speedstep.h>
#include <arch/cpu.h>
#define SERIAL_DEV PNP_DEV(0x2e, W83627DHG_SP1)
#define GPIO_DEV PNP_DEV(0x2e, W83627DHG_GPIO2345_V)
/*
* BSEL0 is connected with GPIO32
* BSEL1 is connected with GPIO33 with inversed logic
* BSEL2 is connected with GPIO55
*/
static int setup_sio_gpio(u8 bsel)
{
int need_reset = 0;
u8 reg, old_reg;
pnp_enter_ext_func_mode(GPIO_DEV);
pnp_set_logical_device(GPIO_DEV);
reg = 0x9a;
old_reg = pnp_read_config(GPIO_DEV, 0x2c);
pnp_write_config(GPIO_DEV, 0x2c, reg);
need_reset = (reg != old_reg);
pnp_write_config(GPIO_DEV, 0x30, 0x0e);
pnp_write_config(GPIO_DEV, 0xe0, 0xde);
pnp_write_config(GPIO_DEV, 0xf0, 0xf3);
pnp_write_config(GPIO_DEV, 0xf4, 0x80);
pnp_write_config(GPIO_DEV, 0xf5, 0x80);
/* Invert GPIO33 */
pnp_write_config(GPIO_DEV, 0xf2, 0x08);
reg = (bsel & 3) << 2;
old_reg = pnp_read_config(GPIO_DEV, 0xf1);
pnp_write_config(GPIO_DEV, 0xf1, reg);
need_reset += ((reg & 0xc) != (old_reg & 0xc));
reg = (bsel >> 2) << 5;
old_reg = pnp_read_config(GPIO_DEV, 0xe1);
pnp_write_config(GPIO_DEV, 0xe1, reg);
need_reset += ((reg & 0x20) != (old_reg & 0x20));
pnp_exit_ext_func_mode(GPIO_DEV);
return need_reset;
}
static u8 msr_get_fsb(void)
{
u8 fsbcfg;
msr_t msr;
const u32 eax = cpuid_eax(1);
/* Netburst */
if (((eax >> 8) & 0xf) == 0xf) {
msr = rdmsr(MSR_EBC_FREQUENCY_ID);
fsbcfg = (msr.lo >> 16) & 0x7;
} else { /* Intel Core 2 */
msr = rdmsr(MSR_FSB_FREQ);
fsbcfg = msr.lo & 0x7;
}
return fsbcfg;
}
static void rcba_config(void)
{
/* Enable PCIe Root Port Clock Gate */
RCBA32(CG) = 0x00000001;
}
void mainboard_romstage_entry(void)
{
int s3resume = 0, boot_mode = 0;
u8 c_bsel = msr_get_fsb();
enable_lapic();
i82801gx_lpc_setup();
winbond_enable_serial(SERIAL_DEV, CONFIG_TTYS0_BASE);
/* Set up the console */
console_init();
if (MCHBAR16(SSKPD) == 0xCAFE) {
printk(BIOS_DEBUG, "soft reset detected.\n");
boot_mode = 1;
}
/* Perform some early chipset initialization required
* before RAM initialization can work
*/
i82801gx_early_init();
i945_early_initialization();
s3resume = southbridge_detect_s3_resume();
/*
* Result is that FSB is incorrect on s3 resume (fixed at 800MHz).
* Some CPU accept this others don't.
*/
if (!s3resume && setup_sio_gpio(c_bsel)) {
printk(BIOS_DEBUG,
"Needs reset to configure CPU BSEL straps\n");
full_reset();
}
/* Enable SPD ROMs and DDR-II DRAM */
enable_smbus();
if (CONFIG(DEBUG_RAM_SETUP))
dump_spd_registers();
sdram_initialize(s3resume ? 2 : boot_mode, NULL);
/* This should probably go away. Until now it is required
* and mainboard specific
*/
rcba_config();
/* Chipset Errata! */
fixup_i945_errata();
/* Initialize the internal PCIe links before we go into stage2 */
i945_late_initialization(s3resume);
}
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