path: root/drivers/usb/host/xhci-hub.c

/*
 * xHCI host controller driver
 *
 * Copyright (C) 2008 Intel Corp.
 *
 * Author: Sarah Sharp
 * Some code borrowed from the Linux EHCI driver.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/gfp.h>
#include <asm/unaligned.h>

#include "xhci.h"

#define	PORT_WAKE_BITS	(PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E)
#define	PORT_RWC_BITS	(PORT_CSC | PORT_PEC | PORT_WRC | PORT_OCC | \
			 PORT_RC | PORT_PLC | PORT_PE)

/* usb 1.1 root hub device descriptor */
static u8 usb_bos_descriptor [] = {
	USB_DT_BOS_SIZE,		/*  __u8 bLength, 5 bytes */
	USB_DT_BOS,			/*  __u8 bDescriptorType */
	0x0F, 0x00,			/*  __le16 wTotalLength, 15 bytes */
	0x1,				/*  __u8 bNumDeviceCaps */
	/* First device capability */
	USB_DT_USB_SS_CAP_SIZE,		/*  __u8 bLength, 10 bytes */
	USB_DT_DEVICE_CAPABILITY,	/* Device Capability */
	USB_SS_CAP_TYPE,		/* bDevCapabilityType, SUPERSPEED_USB */
	0x00,				/* bmAttributes, LTM off by default */
	USB_5GBPS_OPERATION, 0x00,	/* wSpeedsSupported, 5Gbps only */
	0x03,				/* bFunctionalitySupport,
					   USB 3.0 speed only */
	0x00,				/* bU1DevExitLat, set later. */
	0x00, 0x00			/* __le16 bU2DevExitLat, set later. */
};


static void xhci_common_hub_descriptor(struct xhci_hcd *xhci,
		struct usb_hub_descriptor *desc, int ports)
{
	u16 temp;

	desc->bPwrOn2PwrGood = 10;	/* xhci section 5.4.9 says 20ms max */
	desc->bHubContrCurrent = 0;

	desc->bNbrPorts = ports;
	temp = 0;
	/* Bits 1:0 - support per-port power switching, or power always on */
	if (HCC_PPC(xhci->hcc_params))
		temp |= HUB_CHAR_INDV_PORT_LPSM;
	else
		temp |= HUB_CHAR_NO_LPSM;
	/* Bit  2 - root hubs are not part of a compound device */
	/* Bits 4:3 - individual port over current protection */
	temp |= HUB_CHAR_INDV_PORT_OCPM;
	/* Bits 6:5 - no TTs in root ports */
	/* Bit  7 - no port indicators */
	desc->wHubCharacteristics = cpu_to_le16(temp);
}

/* Fill in the USB 2.0 roothub descriptor */
static void xhci_usb2_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
		struct usb_hub_descriptor *desc)
{
	int ports;
	u16 temp;
	__u8 port_removable[(USB_MAXCHILDREN + 1 + 7) / 8];
	u32 portsc;
	unsigned int i;

	ports = xhci->num_usb2_ports;

	xhci_common_hub_descriptor(xhci, desc, ports);
	desc->bDescriptorType = USB_DT_HUB;
	temp = 1 + (ports / 8);
	desc->bDescLength = USB_DT_HUB_NONVAR_SIZE + 2 * temp;

	/* The Device Removable bits are reported on a byte granularity.
	 * If the port doesn't exist within that byte, the bit is set to 0.
	 */
	memset(port_removable, 0, sizeof(port_removable));
	for (i = 0; i < ports; i++) {
		portsc = xhci_readl(xhci, xhci->usb2_ports[i]);
		/* If a device is removable, PORTSC reports a 0, same as in the
		 * hub descriptor DeviceRemovable bits.
		 */
		if (portsc & PORT_DEV_REMOVE)
			/* This math is hairy because bit 0 of DeviceRemovable
			 * is reserved, and bit 1 is for port 1, etc.
			 */
			port_removable[(i + 1) / 8] |= 1 << ((i + 1) % 8);
	}

	/* ch11.h defines a hub descriptor that has room for USB_MAXCHILDREN
	 * ports on it.  The USB 2.0 specification says that there are two
	 * variable length fields at the end of the hub descriptor:
	 * DeviceRemovable and PortPwrCtrlMask.  But since we can have less than
	 * USB_MAXCHILDREN ports, we may need to use the DeviceRemovable array
	 * to set PortPwrCtrlMask bits.  PortPwrCtrlMask must always be set to
	 * 0xFF, so we initialize the both arrays (DeviceRemovable and
	 * PortPwrCtrlMask) to 0xFF.  Then we set the DeviceRemovable for each
	 * set of ports that actually exist.
	 */
	memset(desc->u.hs.DeviceRemovable, 0xff,
			sizeof(desc->u.hs.DeviceRemovable));
	memset(desc->u.hs.PortPwrCtrlMask, 0xff,
			sizeof(desc->u.hs.PortPwrCtrlMask));

	for (i = 0; i < (ports + 1 + 7) / 8; i++)
		memset(&desc->u.hs.DeviceRemovable[i], port_removable[i],
				sizeof(__u8));
}

/* Fill in the USB 3.0 roothub descriptor */