xref: /third_party/FreeBSD/sys/dev/usb/usb_bus.h

/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2008-2019 Hans Petter Selasky. All rights reserved.
 *
 * 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.
 *
 * 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.
 */

#ifndef _USB_BUS_H_
#define	_USB_BUS_H_

/*
 * The following structure defines the USB explore message sent to the USB
 * explore process.
 */

struct usb_bus_msg {
	struct usb_proc_msg hdr;
	struct usb_bus *bus;
};

/*
 * The following structure defines an USB BUS. There is one USB BUS
 * for every Host or Device controller.
 */
struct usb_bus {
#if USB_HAVE_ROOT_MOUNT_HOLD
	struct root_hold_token *bus_roothold;
#endif

/* convenience macros */
#define	USB_BUS_TT_PROC(bus) USB_BUS_NON_GIANT_ISOC_PROC(bus)
#define	USB_BUS_CS_PROC(bus) USB_BUS_NON_GIANT_ISOC_PROC(bus)

#if USB_HAVE_PER_BUS_PROCESS
#define	USB_BUS_GIANT_PROC(bus) (&(bus)->giant_callback_proc)
#define	USB_BUS_NON_GIANT_ISOC_PROC(bus) (&(bus)->non_giant_isoc_callback_proc)
#define	USB_BUS_NON_GIANT_BULK_PROC(bus) (&(bus)->non_giant_bulk_callback_proc)
#define	USB_BUS_EXPLORE_PROC(bus) (&(bus)->explore_proc)
#define	USB_BUS_CONTROL_XFER_PROC(bus) (&(bus)->control_xfer_proc)
	/*
	 * There are three callback processes. One for Giant locked
	 * callbacks. One for non-Giant locked non-periodic callbacks
	 * and one for non-Giant locked periodic callbacks. This
	 * should avoid congestion and reduce response time in most
	 * cases.
	 */
	struct usb_process giant_callback_proc;
	struct usb_process non_giant_isoc_callback_proc;
	struct usb_process non_giant_bulk_callback_proc;

	/* Explore process */
	struct usb_process explore_proc;

	/* Control request process */
	struct usb_process control_xfer_proc;
#endif

	struct usb_bus_msg explore_msg[2];
	struct usb_bus_msg detach_msg[2];
	struct usb_bus_msg attach_msg[2];
	struct usb_bus_msg suspend_msg[2];
	struct usb_bus_msg resume_msg[2];
	struct usb_bus_msg reset_msg[2];
	struct usb_bus_msg shutdown_msg[2];
	/*
	 * This mutex protects the USB hardware:
	 */
	struct mtx bus_mtx;
	struct mtx bus_spin_lock;
	struct usb_xfer_queue intr_q;
	struct usb_callout power_wdog;	/* power management */

	device_t parent;
	device_t bdev;			/* filled by HC driver */

#if USB_HAVE_BUSDMA
	struct usb_dma_parent_tag dma_parent_tag[1];
	struct usb_dma_tag dma_tags[USB_BUS_DMA_TAG_MAX];
#endif
	const struct usb_bus_methods *methods;	/* filled by HC driver */
	struct usb_device **devices;

	struct ifnet *ifp;	/* only for USB Packet Filter */

	usb_power_mask_t hw_power_state;	/* see USB_HW_POWER_XXX */
	usb_size_t uframe_usage[USB_HS_MICRO_FRAMES_MAX];

	uint16_t isoc_time_last;	/* in milliseconds */

	uint8_t	alloc_failed;		/* Set if memory allocation failed. */
	uint8_t	driver_added_refcount;	/* Current driver generation count */
	enum usb_revision usbrev;	/* USB revision. See "USB_REV_XXX". */

	uint8_t	devices_max;		/* maximum number of USB devices */
	uint8_t	do_probe;		/* set if USB should be re-probed */
	uint8_t no_explore;		/* don't explore USB ports */
	uint8_t dma_bits;		/* number of DMA address lines */
	uint8_t control_ep_quirk;	/* need 64kByte buffer for data stage */
};

#endif					/* _USB_BUS_H_ */