system76-coreboot/payloads/libpayload/drivers/usb/usbinit.c

/*
 *
 * Copyright (C) 2008-2010 coresystems GmbH
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

//#define USB_DEBUG
#include <libpayload-config.h>
#include <usb/usb.h>
#include "uhci.h"
#include "ohci.h"
#include "ehci.h"
#include "xhci.h"
#include "dwc2.h"
#include <usb/usbdisk.h>

#if CONFIG(LP_USB_PCI)
/**
 * Initializes USB controller attached to PCI
 *
 * @param bus PCI bus number
 * @param dev PCI device id at bus
 * @param func function id of the controller
 */
static int usb_controller_initialize(int bus, int dev, int func)
{
	u32 class;
	u32 devclass;
	u32 prog_if;
	pcidev_t pci_device;
	u32 pciid;

	pci_device = PCI_DEV(bus, dev, func);
	class = pci_read_config32(pci_device, 8);
	pciid = pci_read_config32(pci_device, 0);

	devclass = class >> 16;
	prog_if = (class >> 8) & 0xff;

	/* enable busmaster */
	if (devclass == 0xc03) {
		u16 pci_command;

		pci_command = pci_read_config16(pci_device, PCI_COMMAND);
		pci_command |= PCI_COMMAND_MASTER;
		pci_write_config16(pci_device, PCI_COMMAND, pci_command);

		usb_debug("%02x:%02x.%x %04x:%04x.%d ", bus, dev, func,
			pciid >> 16, pciid & 0xFFFF, func);
		switch (prog_if) {
		case 0x00:
#if CONFIG(LP_USB_UHCI)
			usb_debug("UHCI controller\n");
			uhci_pci_init(pci_device);
#else
			usb_debug("UHCI controller (not supported)\n");
#endif
			break;

		case 0x10:
#if CONFIG(LP_USB_OHCI)
			usb_debug("OHCI controller\n");
			ohci_pci_init(pci_device);
#else
			usb_debug("OHCI controller (not supported)\n");
#endif
			break;

		case 0x20:
#if CONFIG(LP_USB_EHCI)
			usb_debug("EHCI controller\n");
			ehci_pci_init(pci_device);
#else
			usb_debug("EHCI controller (not supported)\n");
#endif
			break;

		case 0x30:
#if CONFIG(LP_USB_XHCI)
			usb_debug("xHCI controller\n");
			xhci_pci_init(pci_device);
#else
			usb_debug("xHCI controller (not supported)\n");
#endif
			break;

		default:
			usb_debug("unknown controller %x not supported\n",
			       prog_if);
			break;
		}
	}

	return 0;
}

static void usb_scan_pci_bus(int bus)
{
	int dev, func;
	for (dev = 0; dev < 32; dev++) {
		u8 header_type;
		pcidev_t pci_device = PCI_DEV(bus, dev, 0);

		/* Check if there's a device here at all. */
		if (pci_read_config32(pci_device, REG_VENDOR_ID) == 0xffffffff)
			continue;

		/*
		 * EHCI is defined by standards to be at a higher function
		 * than the USB1 controllers. We don't want to init USB1 +
		 * devices just to "steal" those for USB2, so make sure USB2
		 * comes first by scanning multifunction devices from 7 to 0.
		 */

		/* Check for a multifunction device. */
		header_type = pci_read_config8(pci_device, REG_HEADER_TYPE);
		if (header_type & HEADER_TYPE_MULTIFUNCTION)
			func = 7;
		else
			func = 0;

		for (; func >= 0; func--) {
			pci_device = PCI_DEV(bus, dev, func);
			header_type = pci_read_config8(pci_device, REG_HEADER_TYPE);
			/* If this is a bridge, scan the other side. */
			if ((header_type & ~HEADER_TYPE_MULTIFUNCTION) ==
					HEADER_TYPE_BRIDGE) {
				/* Verify that the bridge is enabled */
				if ((pci_read_config16(pci_device, REG_COMMAND)
						& 3) != 0)
					usb_scan_pci_bus(pci_read_config8(
						pci_device, REG_SECONDARY_BUS));
			}
			else
				usb_controller_initialize(bus, dev, func);
		}
	}
}
#endif

/**
 * Initialize all USB controllers attached to PCI.
 */
int usb_initialize(void)
{
#if CONFIG(LP_USB_PCI)
	usb_scan_pci_bus(0);
#endif
	return 0;
}

hci_t *usb_add_mmio_hc(hc_type type, void *bar)
{
	switch (type) {
#if CONFIG(LP_USB_OHCI)
	case OHCI:
		return ohci_init((unsigned long)bar);
#endif
#if CONFIG(LP_USB_EHCI)
	case EHCI:
		return ehci_init((unsigned long)bar);
#endif
#if CONFIG(LP_USB_DWC2)
	case DWC2:
		return dwc2_init(bar);
#endif
#if CONFIG(LP_USB_XHCI)
	case XHCI:
		return xhci_init((unsigned long)bar);
#endif
	default:
		usb_debug("HC type %d (at %p) is not supported!\n", type, bar);
		return NULL;
	}
}