Brooklyn/drivers/usb/host/dwc_otg/dwc_otg_hcd.h

/* ==========================================================================
 * $File: //dwh/usb_iip/dev/software/otg/linux/drivers/dwc_otg_hcd.h $
 * $Revision: #58 $
 * $Date: 2011/09/15 $
 * $Change: 1846647 $
 *
 * Synopsys HS OTG Linux Software Driver and documentation (hereinafter,
 * "Software") is an Unsupported proprietary work of Synopsys, Inc. unless
 * otherwise expressly agreed to in writing between Synopsys and you.
 *
 * The Software IS NOT an item of Licensed Software or Licensed Product under
 * any End User Software License Agreement or Agreement for Licensed Product
 * with Synopsys or any supplement thereto. You are permitted to use and
 * redistribute this Software in source and binary forms, with or without
 * modification, provided that redistributions of source code must retain this
 * notice. You may not view, use, disclose, copy or distribute this file or
 * any information contained herein except pursuant to this license grant from
 * Synopsys. If you do not agree with this notice, including the disclaimer
 * below, then you are not authorized to use the Software.
 *
 * THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS" BASIS
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS 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 DWC_DEVICE_ONLY
#ifndef __DWC_HCD_H__
#define __DWC_HCD_H__

#include "dwc_otg_os_dep.h"
#include "usb.h"
#include "dwc_otg_hcd_if.h"
#include "dwc_otg_core_if.h"
#include "dwc_list.h"
#include "dwc_otg_cil.h"
#include "dwc_otg_fiq_fsm.h"
#include "dwc_otg_driver.h"


/**
 * @file
 *
 * This file contains the structures, constants, and interfaces for
 * the Host Contoller Driver (HCD).
 *
 * The Host Controller Driver (HCD) is responsible for translating requests
 * from the USB Driver into the appropriate actions on the DWC_otg controller.
 * It isolates the USBD from the specifics of the controller by providing an
 * API to the USBD.
 */

struct dwc_otg_hcd_pipe_info {
	uint8_t dev_addr;
	uint8_t ep_num;
	uint8_t pipe_type;
	uint8_t pipe_dir;
	uint16_t mps;
};

struct dwc_otg_hcd_iso_packet_desc {
	uint32_t offset;
	uint32_t length;
	uint32_t actual_length;
	uint32_t status;
};

struct dwc_otg_qtd;

struct dwc_otg_hcd_urb {
	void *priv;
	struct dwc_otg_qtd *qtd;
	void *buf;
	dwc_dma_t dma;
	void *setup_packet;
	dwc_dma_t setup_dma;
	uint32_t length;
	uint32_t actual_length;
	uint32_t status;
	uint32_t error_count;
	uint32_t packet_count;
	uint32_t flags;
	uint16_t interval;
	struct dwc_otg_hcd_pipe_info pipe_info;
	struct dwc_otg_hcd_iso_packet_desc iso_descs[0];
};

static inline uint8_t dwc_otg_hcd_get_ep_num(struct dwc_otg_hcd_pipe_info *pipe)
{
	return pipe->ep_num;
}

static inline uint8_t dwc_otg_hcd_get_pipe_type(struct dwc_otg_hcd_pipe_info
						*pipe)
{
	return pipe->pipe_type;
}

static inline uint16_t dwc_otg_hcd_get_mps(struct dwc_otg_hcd_pipe_info *pipe)
{
	return pipe->mps;
}

static inline uint8_t dwc_otg_hcd_get_dev_addr(struct dwc_otg_hcd_pipe_info
					       *pipe)
{
	return pipe->dev_addr;
}

static inline uint8_t dwc_otg_hcd_is_pipe_isoc(struct dwc_otg_hcd_pipe_info
					       *pipe)
{
	return (pipe->pipe_type == UE_ISOCHRONOUS);
}

static inline uint8_t dwc_otg_hcd_is_pipe_int(struct dwc_otg_hcd_pipe_info
					      *pipe)
{
	return (pipe->pipe_type == UE_INTERRUPT);
}

static inline uint8_t dwc_otg_hcd_is_pipe_bulk(struct dwc_otg_hcd_pipe_info
					       *pipe)
{
	return (pipe->pipe_type == UE_BULK);
}

static inline uint8_t dwc_otg_hcd_is_pipe_control(struct dwc_otg_hcd_pipe_info
						  *pipe)
{
	return (pipe->pipe_type == UE_CONTROL);
}

static inline uint8_t dwc_otg_hcd_is_pipe_in(struct dwc_otg_hcd_pipe_info *pipe)
{
	return (pipe->pipe_dir == UE_DIR_IN);
}

static inline uint8_t dwc_otg_hcd_is_pipe_out(struct dwc_otg_hcd_pipe_info
					      *pipe)
{
	return (!dwc_otg_hcd_is_pipe_in(pipe));
}

static inline void dwc_otg_hcd_fill_pipe(struct dwc_otg_hcd_pipe_info *pipe,
					 uint8_t devaddr, uint8_t ep_num,
					 uint8_t pipe_type, uint8_t pipe_dir,
					 uint16_t mps)
{
	pipe->dev_addr = devaddr;
	pipe->ep_num = ep_num;
	pipe->pipe_type = pipe_type;
	pipe->pipe_dir = pipe_dir;
	pipe->mps = mps;
}

/**
 * Phases for control transfers.
 */
typedef enum dwc_otg_control_phase {
	DWC_OTG_CONTROL_SETUP,
	DWC_OTG_CONTROL_DATA,
	DWC_OTG_CONTROL_STATUS
} dwc_otg_control_phase_e;

/** Transaction types. */
typedef enum dwc_otg_transaction_type {
	DWC_OTG_TRANSACTION_NONE          = 0,
	DWC_OTG_TRANSACTION_PERIODIC      = 1,
	DWC_OTG_TRANSACTION_NON_PERIODIC  = 2,
	DWC_OTG_TRANSACTION_ALL           = DWC_OTG_TRANSACTION_PERIODIC + DWC_OTG_TRANSACTION_NON_PERIODIC
} dwc_otg_transaction_type_e;

struct dwc_otg_qh;

/**
 * A Queue Transfer Descriptor (QTD) holds the state of a bulk, control,
 * interrupt, or isochronous transfer. A single QTD is created for each URB
 * (of one of these types) submitted to the HCD. The transfer associated with
 * a QTD may require one or multiple transactions.
 *
 * A QTD is linked to a Queue Head, which is entered in either the
 * non-periodic or periodic schedule for execution. When a QTD is chosen for
 * execution, some or all of its transactions may be executed. After
 * execution, the state of the QTD is updated. The QTD may be retired if all
 * its transactions are complete or if an error occurred. Otherwise, it
 * remains in the schedule so more transactions can be executed later.
 */
typedef struct dwc_otg_qtd {
	/**
	 * Determines the PID of the next data packet for the data phase of
	 * control transfers. Ignored for other transfer types.<br>
	 * One of the following values:
	 *	- DWC_OTG_HC_PID_DATA0
	 *	- DWC_OTG_HC_PID_DATA1
	 */
	uint8_t data_toggle;

	/** Current phase for control transfers (Setup, Data, or Status). */
	dwc_otg_control_phase_e control_phase;

	/** Keep track of the current split type
	 * for FS/LS endpoints on a HS Hub */
	uint8_t complete_split;

	/** How many bytes transferred during SSPLIT OUT */
	uint32_t ssplit_out_xfer_count;

	/**
	 * Holds the number of bus errors that have occurred for a transaction
	 * within this transfer.
	 */
	uint8_t error_count;

	/**
	 * Index of the next frame descriptor for an isochronous transfer. A
	 * frame descriptor describes the buffer position and length of the
	 * data to be transferred in the next scheduled (micro)frame of an
	 * isochronous transfer. It also holds status for that transaction.
	 * The frame index starts at 0.
	 */
	uint16_t isoc_frame_index;

	/** Position of the ISOC split on full/low speed */
	uint8_t isoc_split_pos;

	/** Position of the ISOC split in the buffer for the current frame */
	uint16_t isoc_split_offset;

	/** URB for this transfer */
	struct dwc_otg_hcd_urb *urb;

	struct dwc_otg_qh *qh;

	/** This list of QTDs */
	 DWC_CIRCLEQ_ENTRY(dwc_otg_qtd) qtd_list_entry;

	/** Indicates if this QTD is currently processed by HW. */
	uint8_t in_process;

	/** Number of DMA descriptors for this QTD */
	uint8_t n_desc;

	/**
	 * Last activated frame(packet) index.
	 * Used in Descriptor DMA mode only.
	 */
	uint16_t isoc_frame_index_last;

} dwc_otg_qtd_t;

DWC_CIRCLEQ_HEAD(dwc_otg_qtd_list, dwc_otg_qtd);

/**
 * A Queue Head (QH) holds the static characteristics of an endpoint and
 * maintains a list of transfers (QTDs) for that endpoint. A QH structure may
 * be entered in either the non-periodic or periodic schedule.
 */
typedef struct dwc_otg_qh {
	/**
	 * Endpoint type.
	 * One of the following values:
	 *	- UE_CONTROL
	 *	- UE_BULK
	 *	- UE_INTERRUPT
	 *	- UE_ISOCHRONOUS
	 */
	uint8_t ep_type;
	uint8_t ep_is_in;

	/** wMaxPacketSize Field of Endpoint Descriptor. */
	uint16_t maxp;

	/**
	 * Device speed.
	 * One of the following values:
	 *	- DWC_OTG_EP_SPEED_LOW
	 *	- DWC_OTG_EP_SPEED_FULL
	 *	- DWC_OTG_EP_SPEED_HIGH
	 */
	uint8_t dev_speed;

	/**
	 * Determines the PID of the next data packet for non-control
	 * transfers. Ignored for control transfers.<br>
	 * One of the following values:
	 *	- DWC_OTG_HC_PID_DATA0
	 *	- DWC_OTG_HC_PID_DATA1
	 */
	uint8_t data_toggle;

	/** Ping state if 1. */
	uint8_t ping_state;

	/**
	 * List of QTDs for this QH.
	 */
	struct dwc_otg_qtd_list qtd_list;

	/** Host channel currently processing transfers for this QH. */
	struct dwc_hc *channel;

	/** Full/low speed endpoint on high-speed hub requires split. */
	uint8_t do_split;

	/** @name Periodic schedule information */
	/** @{ */

	/** Bandwidth in microseconds per (micro)frame. */
	uint16_t usecs;

	/** Interval between transfers in (micro)frames. */
	uint16_t interval;

	/**
	 * (micro)frame to initialize a periodic transfer. The transfer
	 * executes in the following (micro)frame.
	 */
	uint16_t sched_frame;

	/*
	** Frame a NAK was received on this queue head, used to minimise NAK retransmission
	*/
	uint16_t nak_frame;

	/** (micro)frame at which last start split was initialized. */
	uint16_t start_split_frame;

	/** @} */

	/**
	 * Used instead of original buffer if
	 * it(physical address) is not dword-aligned.
	 */
	uint8_t *dw_align_buf;
	dwc_dma_t dw_align_buf_dma;

	/** Entry for QH in either the periodic or non-periodic schedule. */
	dwc_list_link_t qh_list_entry;

	/** @name Descriptor DMA support */
	/** @{ */

	/** Descriptor List. */
	dwc_otg_host_dma_desc_t *desc_list;

	/** Descriptor List physical address. */
	dwc_dma_t desc_list_dma;

	/**
	 * Xfer Bytes array.
	 * Each element corresponds to a descriptor and indicates
	 * original XferSize size value for the descriptor.
	 */
	uint32_t *n_bytes;

	/** Actual number of transfer descriptors in a list. */
	uint16_t ntd;

	/** First activated isochronous transfer descriptor index. */
	uint8_t td_first;
	/** Last activated isochronous transfer descriptor index. */
	uint8_t td_last;

	/** @} */


	uint16_t speed;
	uint16_t frame_usecs[8];

	uint32_t skip_count;
} dwc_otg_qh_t;

DWC_CIRCLEQ_HEAD(hc_list, dwc_hc);

typedef struct urb_tq_entry {
	struct urb *urb;
	DWC_TAILQ_ENTRY(urb_tq_entry) urb_tq_entries;
} urb_tq_entry_t;

DWC_TAILQ_HEAD(urb_list, urb_tq_entry);

/**
 * This structure holds the state of the HCD, including the non-periodic and
 * periodic schedules.
 */
struct dwc_otg_hcd {
	/** The DWC otg device pointer */
	struct dwc_otg_device *otg_dev;
	/** DWC OTG Core Interface Layer */
	dwc_otg_core_if_t *core_if;

	/** Function HCD driver callbacks */
	struct dwc_otg_hcd_function_ops *fops;

	/** Internal DWC HCD Flags */
	volatile union dwc_otg_hcd_internal_flags {
		uint32_t d32;
		struct {
			unsigned port_connect_status_change:1;
			unsigned port_connect_status:1;
			unsigned port_reset_change:1;
			unsigned port_enable_change:1;
			unsigned port_suspend_change:1;
			unsigned port_over_current_change:1;
			unsigned port_l1_change:1;
			unsigned port_speed:2;
			unsigned reserved:24;
		} b;
	} flags;

	/**
	 * Inactive items in the non-periodic schedule. This is a list of
	 * Queue Heads. Transfers associated with these Queue Heads are not
	 * currently assigned to a host channel.
	 */
	dwc_list_link_t non_periodic_sched_inactive;

	/**
	 * Active items in the non-periodic schedule. This is a list of
	 * Queue Heads. Transfers associated with these Queue Heads are
	 * currently assigned to a host channel.
	 */
	dwc_list_link_t non_periodic_sched_active;

	/**
	 * Pointer to the next Queue Head to process in the active
	 * non-periodic schedule.
	 */
	dwc_list_link_t *non_periodic_qh_ptr;

	/**
	 * Inactive items in the periodic schedule. This is a list of QHs for
	 * periodic transfers that are _not_ scheduled for the next frame.
	 * Each QH in the list has an interval counter that determines when it
	 * needs to be scheduled for execution. This scheduling mechanism
	 * allows only a simple calculation for periodic bandwidth used (i.e.
	 * must assume that all periodic transfers may need to execute in the
	 * same frame). However, it greatly simplifies scheduling and should
	 * be sufficient for the vast majority of OTG hosts, which need to
	 * connect to a small number of peripherals at one time.
	 *
	 * Items move from this list to periodic_sched_ready when the QH
	 * interval counter is 0 at SOF.
	 */
	dwc_list_link_t periodic_sched_inactive;

	/**
	 * List of periodic QHs that are ready for execution in the next
	 * frame, but have not yet been assigned to host channels.
	 *
	 * Items move from this list to periodic_sched_assigned as host
	 * channels become available during the current frame.
	 */
	dwc_list_link_t periodic_sched_ready;

	/**
	 * List of periodic QHs to be executed in the next frame that are
	 * assigned to host channels.
	 *
	 * Items move from this list to periodic_sched_queued as the
	 * transactions for the QH are queued to the DWC_otg controller.
	 */
	dwc_list_link_t periodic_sched_assigned;

	/**
	 * List of periodic QHs that have been queued for execution.
	 *
	 * Items move from this list to either periodic_sched_inactive or
	 * periodic_sched_ready when the channel associated with the transfer
	 * is released. If the interval for the QH is 1, the item moves to
	 * periodic_sched_ready because it must be rescheduled for the next
	 * frame. Otherwise, the item moves to periodic_sched_inactive.
	 */
	dwc_list_link_t periodic_sched_queued;

	/**
	 * Total bandwidth claimed so far for periodic transfers. This value
	 * is in microseconds per (micro)frame. The assumption is that all
	 * periodic transfers may occur in the same (micro)frame.
	 */
	uint16_t periodic_usecs;

	/**
	 * Total bandwidth claimed so far for all periodic transfers
	 * in a frame.
	 * This will include a mixture of HS and FS transfers.
	 * Units are microseconds per (micro)frame.
	 * We have a budget per frame and have to schedule
	 * transactions accordingly.
	 * Watch out for the fact that things are actually scheduled for the
	 * "next frame".
	 */
	uint16_t                frame_usecs[8];


	/**
	 * Frame number read from the core at SOF. The value ranges from 0 to
	 * DWC_HFNUM_MAX_FRNUM.
	 */
	uint16_t frame_number;

	/**
	 * Count of periodic QHs, if using several eps. For SOF enable/disable.
	 */
	uint16_t periodic_qh_count;

	/**
	 * Free host channels in the controller. This is a list of
	 * dwc_hc_t items.
	 */
	struct hc_list free_hc_list;
	/**
	 * Number of host channels assigned to periodic transfers. Currently
	 * assuming that there is a dedicated host channel for each periodic
	 * transaction and at least one host channel available for
	 * non-periodic transactions.
	 */
	int periodic_channels; /* microframe_schedule==0 */

	/**
	 * Number of host channels assigned to non-periodic transfers.
	 */
	int non_periodic_channels; /* microframe_schedule==0 */

	/**
	 * Number of host channels assigned to non-periodic transfers.
	 */
	int available_host_channels;

	/**
	 * Array of pointers to the host channel descriptors. Allows accessing
	 * a host channel descriptor given the host channel number. This is
	 * useful in interrupt handlers.
	 */
	struct dwc_hc *hc_ptr_array[MAX_EPS_CHANNELS];

	/**
	 * Buffer to use for any data received during the status phase of a
	 * control transfer. Normally no data is transferred during the status
	 * phase. This buffer is used as a bit bucket.
	 */
	uint8_t *status_buf;

	/**
	 * DMA address for status_buf.
	 */
	dma_addr_t status_buf_dma;
#define DWC_OTG_HCD_STATUS_BUF_SIZE 64

	/**
	 * Connection timer. An OTG host must display a message if the device
	 * does not connect. Started when the VBus power is turned on via
	 * sysfs attribute "buspower".
	 */
	dwc_timer_t *conn_timer;

	/* Tasket to do a reset */
	dwc_tasklet_t *reset_tasklet;

	dwc_tasklet_t *completion_tasklet;
	struct urb_list completed_urb_list;

	/*  */
	dwc_spinlock_t *lock;
	/**
	 * Private data that could be used by OS wrapper.
	 */
	void *priv;

	uint8_t otg_port;

	/** Frame List */
	uint32_t *frame_list;

	/** Hub - Port assignment */
	int hub_port[128];
#ifdef FIQ_DEBUG
	int hub_port_alloc[2048];
#endif

	/** Frame List DMA address */
	dma_addr_t frame_list_dma;

	struct fiq_stack *fiq_stack;
	struct fiq_state *fiq_state;

	/** Virtual address for split transaction DMA bounce buffers */
	struct fiq_dma_blob *fiq_dmab;

#ifdef DEBUG
	uint32_t frrem_samples;
	uint64_t frrem_accum;

	uint32_t hfnum_7_samples_a;
	uint64_t hfnum_7_frrem_accum_a;
	uint32_t hfnum_0_samples_a;
	uint64_t hfnum_0_frrem_accum_a;
	uint32_t hfnum_other_samples_a;
	uint64_t hfnum_other_frrem_accum_a;

	uint32_t hfnum_7_samples_b;
	uint64_t hfnum_7_frrem_accum_b;
	uint32_t hfnum_0_samples_b;
	uint64_t hfnum_0_frrem_accum_b;
	uint32_t hfnum_other_samples_b;
	uint64_t hfnum_other_frrem_accum_b;
#endif
};

static inline struct device *dwc_otg_hcd_to_dev(struct dwc_otg_hcd *hcd)
{
	return &hcd->otg_dev->os_dep.platformdev->dev;
}

/** @name Transaction Execution Functions */
/** @{ */
extern dwc_otg_transaction_type_e dwc_otg_hcd_select_transactions(dwc_otg_hcd_t
								  * hcd);
extern void dwc_otg_hcd_queue_transactions(dwc_otg_hcd_t * hcd,
					   dwc_otg_transaction_type_e tr_type);

int dwc_otg_hcd_allocate_port(dwc_otg_hcd_t * hcd, dwc_otg_qh_t *qh);
void dwc_otg_hcd_release_port(dwc_otg_hcd_t * dwc_otg_hcd, dwc_otg_qh_t *qh);

extern int fiq_fsm_queue_transaction(dwc_otg_hcd_t *hcd, dwc_otg_qh_t *qh);
extern int fiq_fsm_transaction_suitable(dwc_otg_hcd_t *hcd, dwc_otg_qh_t *qh);
extern void dwc_otg_cleanup_fiq_channel(dwc_otg_hcd_t *hcd, uint32_t num);

/** @} */

/** @name Interrupt Handler Functions */
/** @{ */
extern int32_t dwc_otg_hcd_handle_intr(dwc_otg_hcd_t * dwc_otg_hcd);
extern int32_t dwc_otg_hcd_handle_sof_intr(dwc_otg_hcd_t * dwc_otg_hcd);
extern int32_t dwc_otg_hcd_handle_rx_status_q_level_intr(dwc_otg_hcd_t *
							 dwc_otg_hcd);
extern int32_t dwc_otg_hcd_handle_np_tx_fifo_empty_intr(dwc_otg_hcd_t *
							dwc_otg_hcd);
extern int32_t dwc_otg_hcd_handle_perio_tx_fifo_empty_intr(dwc_otg_hcd_t *
							   dwc_otg_hcd);
extern int32_t dwc_otg_hcd_handle_incomplete_periodic_intr(dwc_otg_hcd_t *
							   dwc_otg_hcd);
extern int32_t dwc_otg_hcd_handle_port_intr(dwc_otg_hcd_t * dwc_otg_hcd);
extern int32_t dwc_otg_hcd_handle_conn_id_status_change_intr(dwc_otg_hcd_t *
							     dwc_otg_hcd);
extern int32_t dwc_otg_hcd_handle_disconnect_intr(dwc_otg_hcd_t * dwc_otg_hcd);
extern int32_t dwc_otg_hcd_handle_hc_intr(dwc_otg_hcd_t * dwc_otg_hcd);
extern int32_t dwc_otg_hcd_handle_hc_n_intr(dwc_otg_hcd_t * dwc_otg_hcd,
					    uint32_t num);
extern int32_t dwc_otg_hcd_handle_session_req_intr(dwc_otg_hcd_t * dwc_otg_hcd);
extern int32_t dwc_otg_hcd_handle_wakeup_detected_intr(dwc_otg_hcd_t *
						       dwc_otg_hcd);
/** @} */

/** @name Schedule Queue Functions */
/** @{ */

/* Implemented in dwc_otg_hcd_queue.c */
extern dwc_otg_qh_t *dwc_otg_hcd_qh_create(dwc_otg_hcd_t * hcd,
					   dwc_otg_hcd_urb_t * urb, int atomic_alloc);
extern void dwc_otg_hcd_qh_free(dwc_otg_hcd_t * hcd, dwc_otg_qh_t * qh);
extern int dwc_otg_hcd_qh_add(dwc_otg_hcd_t * hcd, dwc_otg_qh_t * qh);
extern void dwc_otg_hcd_qh_remove(dwc_otg_hcd_t * hcd, dwc_otg_qh_t * qh);
extern void dwc_otg_hcd_qh_deactivate(dwc_otg_hcd_t * hcd, dwc_otg_qh_t * qh,
				      int sched_csplit);

/** Remove and free a QH */
static inline void dwc_otg_hcd_qh_remove_and_free(dwc_otg_hcd_t * hcd,
						  dwc_otg_qh_t * qh)
{
	dwc_irqflags_t flags;
	DWC_SPINLOCK_IRQSAVE(hcd->lock, &flags);
	dwc_otg_hcd_qh_remove(hcd, qh);
	DWC_SPINUNLOCK_IRQRESTORE(hcd->lock, flags);
	dwc_otg_hcd_qh_free(hcd, qh);
}

/** Allocates memory for a QH structure.
 * @return Returns the memory allocate or NULL on error. */
static inline dwc_otg_qh_t *dwc_otg_hcd_qh_alloc(int atomic_alloc)
{
	if (atomic_alloc)
		return (dwc_otg_qh_t *) DWC_ALLOC_ATOMIC(sizeof(dwc_otg_qh_t));
	else
		return (dwc_otg_qh_t *) DWC_ALLOC(sizeof(dwc_otg_qh_t));
}

extern dwc_otg_qtd_t *dwc_otg_hcd_qtd_create(dwc_otg_hcd_urb_t * urb,
					     int atomic_alloc);
extern void dwc_otg_hcd_qtd_init(dwc_otg_qtd_t * qtd, dwc_otg_hcd_urb_t * urb);
extern int dwc_otg_hcd_qtd_add(dwc_otg_qtd_t * qtd, dwc_otg_hcd_t * dwc_otg_hcd,
			       dwc_otg_qh_t ** qh, int atomic_alloc);

/** Allocates memory for a QTD structure.
 * @return Returns the memory allocate or NULL on error. */
static inline dwc_otg_qtd_t *dwc_otg_hcd_qtd_alloc(int atomic_alloc)
{
	if (atomic_alloc)
		return (dwc_otg_qtd_t *) DWC_ALLOC_ATOMIC(sizeof(dwc_otg_qtd_t));
	else
		return (dwc_otg_qtd_t *) DWC_ALLOC(sizeof(dwc_otg_qtd_t));
}

/** Frees the memory for a QTD structure.  QTD should already be removed from
 * list.
 * @param qtd QTD to free.*/
static inline void dwc_otg_hcd_qtd_free(dwc_otg_qtd_t * qtd)
{
	DWC_FREE(qtd);
}

/** Removes a QTD from list.
 * @param hcd HCD instance.
 * @param qtd QTD to remove from list.
 * @param qh QTD belongs to.
 */
static inline void dwc_otg_hcd_qtd_remove(dwc_otg_hcd_t * hcd,
					  dwc_otg_qtd_t * qtd,
					  dwc_otg_qh_t * qh)
{
	DWC_CIRCLEQ_REMOVE(&qh->qtd_list, qtd, qtd_list_entry);
}

/** Remove and free a QTD
  * Need to disable IRQ and hold hcd lock while calling this function out of
  * interrupt servicing chain */
static inline void dwc_otg_hcd_qtd_remove_and_free(dwc_otg_hcd_t * hcd,
						   dwc_otg_qtd_t * qtd,
						   dwc_otg_qh_t * qh)
{
	dwc_otg_hcd_qtd_remove(hcd, qtd, qh);
	dwc_otg_hcd_qtd_free(qtd);
}

/** @} */

/** @name Descriptor DMA Supporting Functions */
/** @{ */

extern void dwc_otg_hcd_start_xfer_ddma(dwc_otg_hcd_t * hcd, dwc_otg_qh_t * qh);
extern void dwc_otg_hcd_complete_xfer_ddma(dwc_otg_hcd_t * hcd,
					   dwc_hc_t * hc,
					   dwc_otg_hc_regs_t * hc_regs,
					   dwc_otg_halt_status_e halt_status);

extern int dwc_otg_hcd_qh_init_ddma(dwc_otg_hcd_t * hcd, dwc_otg_qh_t * qh);
extern void dwc_otg_hcd_qh_free_ddma(dwc_otg_hcd_t * hcd, dwc_otg_qh_t * qh);

/** @} */

/** @name Internal Functions */
/** @{ */
dwc_otg_qh_t *dwc_urb_to_qh(dwc_otg_hcd_urb_t * urb);
/** @} */

#ifdef CONFIG_USB_DWC_OTG_LPM
extern int dwc_otg_hcd_get_hc_for_lpm_tran(dwc_otg_hcd_t * hcd,
					   uint8_t devaddr);
extern void dwc_otg_hcd_free_hc_from_lpm(dwc_otg_hcd_t * hcd);
#endif

/** Gets the QH that contains the list_head */
#define dwc_list_to_qh(_list_head_ptr_) container_of(_list_head_ptr_, dwc_otg_qh_t, qh_list_entry)

/** Gets the QTD that contains the list_head */
#define dwc_list_to_qtd(_list_head_ptr_) container_of(_list_head_ptr_, dwc_otg_qtd_t, qtd_list_entry)

/** Check if QH is non-periodic  */
#define dwc_qh_is_non_per(_qh_ptr_) ((_qh_ptr_->ep_type == UE_BULK) || \
				     (_qh_ptr_->ep_type == UE_CONTROL))

/** High bandwidth multiplier as encoded in highspeed endpoint descriptors */
#define dwc_hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03))

/** Packet size for any kind of endpoint descriptor */
#define dwc_max_packet(wMaxPacketSize) ((wMaxPacketSize) & 0x07ff)

/**
 * Returns true if _frame1 is less than or equal to _frame2. The comparison is
 * done modulo DWC_HFNUM_MAX_FRNUM. This accounts for the rollover of the
 * frame number when the max frame number is reached.
 */
static inline int dwc_frame_num_le(uint16_t frame1, uint16_t frame2)
{
	return ((frame2 - frame1) & DWC_HFNUM_MAX_FRNUM) <=
	    (DWC_HFNUM_MAX_FRNUM >> 1);
}

/**
 * Returns true if _frame1 is greater than _frame2. The comparison is done
 * modulo DWC_HFNUM_MAX_FRNUM. This accounts for the rollover of the frame
 * number when the max frame number is reached.
 */
static inline int dwc_frame_num_gt(uint16_t frame1, uint16_t frame2)
{
	return (frame1 != frame2) &&
	    (((frame1 - frame2) & DWC_HFNUM_MAX_FRNUM) <
	     (DWC_HFNUM_MAX_FRNUM >> 1));
}

/**
 * Increments _frame by the amount specified by _inc. The addition is done
 * modulo DWC_HFNUM_MAX_FRNUM. Returns the incremented value.
 */
static inline uint16_t dwc_frame_num_inc(uint16_t frame, uint16_t inc)
{
	return (frame + inc) & DWC_HFNUM_MAX_FRNUM;
}

static inline uint16_t dwc_full_frame_num(uint16_t frame)
{
	return (frame & DWC_HFNUM_MAX_FRNUM) >> 3;
}

static inline uint16_t dwc_micro_frame_num(uint16_t frame)
{
	return frame & 0x7;
}

extern void init_hcd_usecs(dwc_otg_hcd_t *_hcd);

void dwc_otg_hcd_save_data_toggle(dwc_hc_t * hc,
				  dwc_otg_hc_regs_t * hc_regs,
				  dwc_otg_qtd_t * qtd);

#ifdef DEBUG
/**
 * Macro to sample the remaining PHY clocks left in the current frame. This
 * may be used during debugging to determine the average time it takes to
 * execute sections of code. There are two possible sample points, "a" and
 * "b", so the _letter argument must be one of these values.
 *
 * To dump the average sample times, read the "hcd_frrem" sysfs attribute. For
 * example, "cat /sys/devices/lm0/hcd_frrem".
 */
#define dwc_sample_frrem(_hcd, _qh, _letter) \
{ \
	hfnum_data_t hfnum; \
	dwc_otg_qtd_t *qtd; \
	qtd = list_entry(_qh->qtd_list.next, dwc_otg_qtd_t, qtd_list_entry); \
	if (usb_pipeint(qtd->urb->pipe) && _qh->start_split_frame != 0 && !qtd->complete_split) { \
		hfnum.d32 = DWC_READ_REG32(&_hcd->core_if->host_if->host_global_regs->hfnum); \
		switch (hfnum.b.frnum & 0x7) { \
		case 7: \
			_hcd->hfnum_7_samples_##_letter++; \
			_hcd->hfnum_7_frrem_accum_##_letter += hfnum.b.frrem; \
			break; \
		case 0: \
			_hcd->hfnum_0_samples_##_letter++; \
			_hcd->hfnum_0_frrem_accum_##_letter += hfnum.b.frrem; \
			break; \
		default: \
			_hcd->hfnum_other_samples_##_letter++; \
			_hcd->hfnum_other_frrem_accum_##_letter += hfnum.b.frrem; \
			break; \
		} \
	} \
}
#else
#define dwc_sample_frrem(_hcd, _qh, _letter)
#endif
#endif
#endif /* DWC_DEVICE_ONLY */