pci_auto_common.c

/*
 * PCI auto-configuration library
 *
 * Author: Matt Porter <mporter@mvista.com>
 *
 * Copyright 2000 MontaVista Software Inc.
 *
 * Modifications for driver model:
 * Copyright 2015 Google, Inc
 * Written by Simon Glass <sjg@chromium.org>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <dm.h>
#include <errno.h>
#include <pci.h>

void pciauto_region_init(struct pci_region *res)
{
	/*
	 * Avoid allocating PCI resources from address 0 -- this is illegal
	 * according to PCI 2.1 and moreover, this is known to cause Linux IDE
	 * drivers to fail. Use a reasonable starting value of 0x1000 instead.
	 */
	res->bus_lower = res->bus_start ? res->bus_start : 0x1000;
}

void pciauto_region_align(struct pci_region *res, pci_size_t size)
{
	res->bus_lower = ((res->bus_lower - 1) | (size - 1)) + 1;
}

int pciauto_region_allocate(struct pci_region *res, pci_size_t size,
	pci_addr_t *bar)
{
	pci_addr_t addr;

	if (!res) {
		debug("No resource");
		goto error;
	}

	addr = ((res->bus_lower - 1) | (size - 1)) + 1;

	if (addr - res->bus_start + size > res->size) {
		debug("No room in resource");
		goto error;
	}

	res->bus_lower = addr + size;

	debug("address=0x%llx bus_lower=0x%llx", (unsigned long long)addr,
	      (unsigned long long)res->bus_lower);

	*bar = addr;
	return 0;

 error:
	*bar = (pci_addr_t)-1;
	return -1;
}

void pciauto_config_init(struct pci_controller *hose)
{
	int i;

	hose->pci_io = NULL;
	hose->pci_mem = NULL;