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/*
* Copyright (C) 2014 Google, Inc
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <errno.h>
#include <fdtdec.h>
#include <malloc.h>
#include <asm/lapic.h>
#include <asm/pci.h>
#include <asm/arch/bd82x6x.h>
#include <asm/arch/model_206ax.h>
#include <asm/arch/pch.h>
#include <asm/arch/sandybridge.h>
void bd82x6x_pci_init(pci_dev_t dev)
{
u16 reg16;
u8 reg8;
debug("bd82x6x PCI init.\n");
/* Enable Bus Master */
reg16 = pci_read_config16(dev, PCI_COMMAND);
reg16 |= PCI_COMMAND_MASTER;
pci_write_config16(dev, PCI_COMMAND, reg16);
/* This device has no interrupt */
pci_write_config8(dev, INTR, 0xff);
/* disable parity error response and SERR */
reg16 = pci_read_config16(dev, BCTRL);
reg16 &= ~(1 << 0);
reg16 &= ~(1 << 1);
pci_write_config16(dev, BCTRL, reg16);
/* Master Latency Count must be set to 0x04! */
reg8 = pci_read_config8(dev, SMLT);
reg8 &= 0x07;
reg8 |= (0x04 << 3);
pci_write_config8(dev, SMLT, reg8);
/* Will this improve throughput of bus masters? */
pci_write_config8(dev, PCI_MIN_GNT, 0x06);
/* Clear errors in status registers */
reg16 = pci_read_config16(dev, PSTS);
/* reg16 |= 0xf900; */
pci_write_config16(dev, PSTS, reg16);
reg16 = pci_read_config16(dev, SECSTS);
/* reg16 |= 0xf900; */
pci_write_config16(dev, SECSTS, reg16);
}
#define PCI_BRIDGE_UPDATE_COMMAND
void bd82x6x_pci_dev_enable_resources(pci_dev_t dev)
{
uint16_t command;
command = pci_read_config16(dev, PCI_COMMAND);
command |= PCI_COMMAND_IO;
#ifdef PCI_BRIDGE_UPDATE_COMMAND
/*
* If we write to PCI_COMMAND, on some systems this will cause the
* ROM and APICs to become invisible.
*/
debug("%x cmd <- %02x\n", dev, command);
pci_write_config16(dev, PCI_COMMAND, command);
#else
printf("%s cmd <- %02x (NOT WRITTEN!)\n", dev_path(dev), command);
#endif
}
void bd82x6x_pci_bus_enable_resources(pci_dev_t dev)
{
uint16_t ctrl;
ctrl = pci_read_config16(dev, PCI_BRIDGE_CONTROL);
ctrl |= PCI_COMMAND_IO;
ctrl |= PCI_BRIDGE_CTL_VGA;
debug("%x bridge ctrl <- %04x\n", dev, ctrl);
pci_write_config16(dev, PCI_BRIDGE_CONTROL, ctrl);
bd82x6x_pci_dev_enable_resources(dev);
}
int bd82x6x_init_pci_devices(void)
{
struct pci_controller *hose;
hose = pci_bus_to_hose(0);
lpc_enable(PCH_LPC_DEV);
lpc_init(hose, PCH_LPC_DEV);
return 0;
}
int bd82x6x_init(void)
{
bd82x6x_pci_init(PCH_DEV);
return 0;
}
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