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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@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, either version 2 of the License, or
* (at your option) any later version.
*
* 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 <device/pci.h>
#include <device/pci_ids.h>
#include <console/console.h>
#include <drivers/generic/ioapic/chip.h>
#include "vx900.h"
#include "chip.h"
/**
* @file vx900/traf_ctrl.c
*
* STATUS:
* The same issues with the IOAPIC pointe in lpc.c also apply here.
*
* We need to check if the current PCIE lane configuration mechanism is sane.
*/
/**
* \brief VX900: Set up the north module IOAPIC (for PCIE and VGA)
*
* Enable the IOAPIC in the south module, and properly set it up.
* \n
* This is the hardware specific initialization for the IOAPIC, and complements
* the setup done by the generic IOAPIC driver. In order for the IOAPIC to work
* properly, it _must_ be declared in devicetree.cb .
* \n
* We are assuming this is called before the drivers/generic/ioapic code,
* which should be the case if devicetree.cb is set up properly.
*/
static void vx900_north_ioapic_setup(struct device *dev)
{
u8 base_val;
struct device *ioapic;
ioapic_config_t *config;
/* Find the IOAPIC, and make sure it's set up correctly in devicetree.cb
* If it's not, then the generic ioapic driver will not set it up
* correctly, and the MP table will not be correctly generated */
for (ioapic = dev->next; ioapic; ioapic = ioapic->next) {
if (ioapic->path.type == DEVICE_PATH_IOAPIC)
break;
}
/* You did put an IOAPIC in devicetree.cb, didn't you? */
if (ioapic == 0) {
/* We don't have enough info to set up the IOAPIC */
printk(BIOS_ERR, "ERROR: North module IOAPIC not found. "
"Check your devicetree.cb\n");
return;
}
/* Found our IOAPIC, and it should not carry ISA interrupts */
config = (ioapic_config_t *) ioapic->chip_info;
if (config->have_isa_interrupts) {
/* Umh, is this the right IOAPIC ? */
printk(BIOS_ERR, "ERROR: North module IOAPIC should not carry "
"ISA interrupts.\n" "Check your devicetree.cb\n");
printk(BIOS_ERR, "Will not initialize this IOAPIC.\n");
return;
}
/* The base address of this IOAPIC _must_
* be between 0xfec00000 and 0xfecfff00
* be 256-byte aligned
*/
if ((config->base < (void *)0xfec0000 || config->base > (void *)0xfecfff00)
|| (((uintptr_t)config->base & 0xff) != 0)) {
printk(BIOS_ERR, "ERROR: North module IOAPIC base should be "
"between 0xfec00000 and 0xfecfff00\n"
"and must be aligned to a 256-byte boundary, "
"but we found it at 0x%p\n", config->base);
return;
}
printk(BIOS_DEBUG, "VX900 TRAF_CTR: Setting up the north module IOAPIC "
"at %p\n", config->base);
/* First register of the IOAPIC base */
base_val = (((uintptr_t)config->base) >> 8) & 0xff;
pci_write_config8(dev, 0x41, base_val);
/* Second register of the base.
* Bit[7] also enables the IOAPIC and bit[5] enables MSI cycles */
base_val = (((uintptr_t)config->base) >> 16) & 0xf;
pci_mod_config8(dev, 0x40, 0, base_val | (1 << 7) | (1 << 5));
}
/*
* Configures the PCI-express ports
*
* FIXME: triple-quadruple-check this
*/
static void vx900_pex_link_setup(struct device *dev)
{
u8 reg8;
struct northbridge_via_vx900_config *nb = (void *)dev->chip_info;
reg8 = pci_read_config8(dev, 0xb0);
reg8 &= ~((1 << 7) | (1 << 3));
if (nb->assign_pex_to_dp)
reg8 |= (1 << 7);
if (!nb->pcie_port1_2_lane_wide)
reg8 |= (1 << 3);
pci_write_config8(dev, 0xb0, reg8);
}
static void vx900_traf_ctr_init(struct device *dev)
{
vx900_north_ioapic_setup(dev);
vx900_pex_link_setup(dev);
}
static struct device_operations traf_ctrl_ops = {
.read_resources = pci_dev_read_resources,
.set_resources = pci_dev_set_resources,
.enable_resources = pci_dev_enable_resources,
.init = vx900_traf_ctr_init,
/* Need this here, or the IOAPIC driver won't be called.
* FIXME: Technically not a LPC bus. */
.scan_bus = scan_lpc_bus,
};
static const struct pci_driver traf_ctrl_driver __pci_driver = {
.ops = &traf_ctrl_ops,
.vendor = PCI_VENDOR_ID_VIA,
.device = PCI_DEVICE_ID_VIA_VX900_TRAF,
};
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