src/soc/intel/apollolake/uart.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2015 Intel Corp.
 *
 * 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.
 */

/*
 * The sole purpose of this driver is to avoid BAR to be changed during
 * resource allocation. Since configuration space is just 32 bytes it
 * shouldn't cause any fragmentation.
 */

#include <console/uart.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <soc/pci_ids.h>
#include <soc/pci_devs.h>

static void aplk_uart_read_resources(struct device *dev)
{
	pci_dev_read_resources(dev);

	if ((IS_ENABLED(CONFIG_SOC_UART_DEBUG) &&
	    dev->path.pci.devfn == _LPSS_PCI_DEVFN(UART,
						CONFIG_UART_FOR_CONSOLE))) {
		/* will override existing resource. */
		fixed_mem_resource(dev, PCI_BASE_ADDRESS_0,
				CONFIG_CONSOLE_UART_BASE_ADDRESS >> 10, 4, 0);
	}
}

static struct device_operations uart_ops = {
	.read_resources   = aplk_uart_read_resources,
	.set_resources    = pci_dev_set_resources,
	.enable_resources = pci_dev_enable_resources,
	.init             = pci_dev_init,
	.enable           = DEVICE_NOOP
};

static const unsigned short uart_ids[] = {
	PCI_DEVICE_ID_APOLLOLAKE_UART0, PCI_DEVICE_ID_APOLLOLAKE_UART1,
	PCI_DEVICE_ID_APOLLOLAKE_UART2, PCI_DEVICE_ID_APOLLOLAKE_UART3,
	0
};

static const struct pci_driver uart_driver __pci_driver = {
	.ops     = &uart_ops,
	.vendor  = PCI_VENDOR_ID_INTEL,
	.devices = uart_ids
};