/* SPDX-License-Identifier: GPL-2.0-only */

#include <console/console.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_def.h>
#include <device/pci_ops.h>
#include <device/pci_ids.h>
#include "pch.h"

static void pci_init(struct device *dev)
{
	u16 reg16;

	printk(BIOS_DEBUG, "PCI init.\n");
	/* Enable Bus Master */
	pci_or_config16(dev, PCI_COMMAND, PCI_COMMAND_MASTER);

	/* This device has no interrupt */
	pci_write_config8(dev, INTR, 0xff);

	/* disable parity error response and SERR */
	pci_and_config16(dev, PCI_BRIDGE_CONTROL,
			 ~(PCI_BRIDGE_CTL_PARITY | PCI_BRIDGE_CTL_SERR));

	/* Master Latency Count must be set to 0x04! */
	pci_update_config8(dev, SMLT, 0x07, (0x04 << 3));

	/* Clear errors in status registers. FIXME: do we need to do something? */
	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);
}

static struct device_operations device_ops = {
	.read_resources		= pci_bus_read_resources,
	.set_resources		= pci_dev_set_resources,
	.enable_resources	= pci_bus_enable_resources,
	.init			= pci_init,
	.scan_bus		= pci_scan_bridge,
	.ops_pci		= &pci_dev_ops_pci,
};

static const unsigned short pci_device_ids[] = {
	0x2448, /* Mobile */
	0x244e, /* Desktop */
	0
};

static const struct pci_driver pch_pci __pci_driver = {
	.ops		= &device_ops,
	.vendor		= PCI_VENDOR_ID_INTEL,
	.devices	= pci_device_ids,
};