u-boot/drivers/usb/host/xhci-pci.c

/*
 * Copyright (c) 2015, Google, Inc
 * Written by Simon Glass <sjg@chromium.org>
 * All rights reserved.
 *
 * SPDX-License-Identifier:	GPL-2.0
 */

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

#include "xhci.h"

/*
 * Create the appropriate control structures to manage a new XHCI host
 * controller.
 */
int xhci_hcd_init(int index, struct xhci_hccr **ret_hccr,
		  struct xhci_hcor **ret_hcor)
{
	struct xhci_hccr *hccr;
	struct xhci_hcor *hcor;
	pci_dev_t pdev;
	uint32_t cmd;
	int len;

	pdev = pci_find_class(PCI_CLASS_SERIAL_USB_XHCI, index);
	if (pdev < 0) {
		printf("XHCI host controller not found\n");
		return -1;
	}

	hccr = (struct xhci_hccr *)pci_map_bar(pdev,
			PCI_BASE_ADDRESS_0, PCI_REGION_MEM);
	len = HC_LENGTH(xhci_readl(&hccr->cr_capbase));
	hcor = (struct xhci_hcor *)((uint32_t)hccr + len);

	debug("XHCI-PCI init hccr 0x%x and hcor 0x%x hc_length %d\n",
	      (uint32_t)hccr, (uint32_t)hcor, len);

	*ret_hccr = hccr;
	*ret_hcor = hcor;

	/* enable busmaster */
	pci_read_config_dword(pdev, PCI_COMMAND, &cmd);
	cmd |= PCI_COMMAND_MASTER;
	pci_write_config_dword(pdev, PCI_COMMAND, cmd);

	return 0;
}

/*
 * Destroy the appropriate control structures corresponding * to the XHCI host
 * controller
 */
void xhci_hcd_stop(int index)
{
}