[linux-block.git] / drivers / usb / host / whci / pzl.c

/*
 * Wireless Host Controller (WHC) periodic schedule management.
 *
 * Copyright (C) 2007 Cambridge Silicon Radio Ltd.
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */
#include <linux/kernel.h>
#include <linux/dma-mapping.h>
#include <linux/uwb/umc.h>
#include <linux/usb.h>

#include "../../wusbcore/wusbhc.h"

#include "whcd.h"

static void update_pzl_pointers(struct whc *whc, int period, u64 addr)
{
	switch (period) {
	case 0:
		whc_qset_set_link_ptr(&whc->pz_list[0], addr);
		whc_qset_set_link_ptr(&whc->pz_list[2], addr);
		whc_qset_set_link_ptr(&whc->pz_list[4], addr);
		whc_qset_set_link_ptr(&whc->pz_list[6], addr);
		whc_qset_set_link_ptr(&whc->pz_list[8], addr);
		whc_qset_set_link_ptr(&whc->pz_list[10], addr);
		whc_qset_set_link_ptr(&whc->pz_list[12], addr);
		whc_qset_set_link_ptr(&whc->pz_list[14], addr);
		break;
	case 1:
		whc_qset_set_link_ptr(&whc->pz_list[1], addr);
		whc_qset_set_link_ptr(&whc->pz_list[5], addr);
		whc_qset_set_link_ptr(&whc->pz_list[9], addr);
		whc_qset_set_link_ptr(&whc->pz_list[13], addr);
		break;
	case 2:
		whc_qset_set_link_ptr(&whc->pz_list[3], addr);
		whc_qset_set_link_ptr(&whc->pz_list[11], addr);
		break;
	case 3:
		whc_qset_set_link_ptr(&whc->pz_list[7], addr);
		break;
	case 4:
		whc_qset_set_link_ptr(&whc->pz_list[15], addr);
		break;
	}
}

/*
 * Return the 'period' to use for this qset.  The minimum interval for
 * the endpoint is used so whatever urbs are submitted the device is
 * polled often enough.
 */
static int qset_get_period(struct whc *whc, struct whc_qset *qset)
{
	uint8_t bInterval = qset->ep->desc.bInterval;

	if (bInterval < 6)
		bInterval = 6;
	if (bInterval > 10)
		bInterval = 10;
	return bInterval - 6;
}

static void qset_insert_in_sw_list(struct whc *whc, struct whc_qset *qset)
{
	int period;

	period = qset_get_period(whc, qset);

	qset_clear(whc, qset);
	list_move(&qset->list_node, &whc->periodic_list[period]);
	qset->in_sw_list = true;
}

static void pzl_qset_remove(struct whc *whc, struct whc_qset *qset)
{
	list_move(&qset->list_node, &whc->periodic_removed_list);
	qset->in_hw_list = false;
	qset->in_sw_list = false;
}

/**
 * pzl_process_qset - process any recently inactivated or halted qTDs
 * in a qset.
 *
 * After inactive qTDs are removed, new qTDs can be added if the
 * urb queue still contains URBs.
 *
 * Returns the schedule updates required.
 */
static enum whc_update pzl_process_qset(struct whc *whc, struct whc_qset *qset)
{
	enum whc_update update = 0;
	uint32_t status = 0;

	while (qset->ntds) {
		struct whc_qtd *td;
		int t;

		t = qset->td_start;
		td = &qset->qtd[qset->td_start];
		status = le32_to_cpu(td->status);

		/*
		 * Nothing to do with a still active qTD.
		 */
		if (status & QTD_STS_ACTIVE)
			break;

		if (status & QTD_STS_HALTED) {
			/* Ug, an error. */
			process_halted_qtd(whc, qset, td);
			goto done;
		}

		/* Mmm, a completed qTD. */
		process_inactive_qtd(whc, qset, td);
	}

	update |= qset_add_qtds(whc, qset);

done:
	/*
	 * If there are no qTDs in this qset, remove it from the PZL.
	 */
	if (qset->remove && qset->ntds == 0) {
		pzl_qset_remove(whc, qset);
		update |= WHC_UPDATE_REMOVED;
	}

	return update;
}

/**
 * pzl_start - start the periodic schedule
 * @whc: the WHCI host controller
 *
 * The PZL must be valid (e.g., all entries in the list should have
 * the T bit set).
 */
void pzl_start(struct whc *whc)
{
	le_writeq(whc->pz_list_dma, whc->base + WUSBPERIODICLISTBASE);

	whc_write_wusbcmd(whc, WUSBCMD_PERIODIC_EN, WUSBCMD_PERIODIC_EN);
	whci_wait_for(&whc->umc->dev, whc->base + WUSBSTS,
		      WUSBSTS_PERIODIC_SCHED, WUSBSTS_PERIODIC_SCHED,
		      1000, "start PZL");
}

/**
 * pzl_stop - stop the periodic schedule
 * @whc: the WHCI host controller
 */
void pzl_stop(struct whc *whc)
{
	whc_write_wusbcmd(whc, WUSBCMD_PERIODIC_EN, 0);
	whci_wait_for(&whc->umc->dev, whc->base + WUSBSTS,
		      WUSBSTS_PERIODIC_SCHED, 0,
		      1000, "stop PZL");
}

/**
 * pzl_update - request a PZL update and wait for the hardware to be synced
 * @whc: the WHCI HC
 * @wusbcmd: WUSBCMD value to start the update.
 *
 * If the WUSB HC is inactive (i.e., the PZL is stopped) then the
 * update must be skipped as the hardware may not respond to update
 * requests.
 */
void pzl_update(struct whc *whc, uint32_t wusbcmd)
{
	struct wusbhc *wusbhc = &whc->wusbhc;
	long t;

	mutex_lock(&wusbhc->mutex);
	if (wusbhc->active) {
		whc_write_wusbcmd(whc, wusbcmd, wusbcmd);
		t = wait_event_timeout(
			whc->periodic_list_wq,
			(le_readl(whc->base + WUSBCMD) & WUSBCMD_PERIODIC_UPDATED) == 0,
			msecs_to_jiffies(1000));
		if (t == 0)
			whc_hw_error(whc, "PZL update timeout");
	}
	mutex_unlock(&wusbhc->mutex);
}

static void update_pzl_hw_view(struct whc *whc)
{
	struct whc_qset *qset, *t;
	int period;
	u64 tmp_qh = 0;

	for (period = 0; period < 5; period++) {
		list_for_each_entry_safe(qset, t, &whc->periodic_list[period], list_node) {
			whc_qset_set_link_ptr(&qset->qh.link, tmp_qh);
			tmp_qh = qset->qset_dma;
			qset->in_hw_list = true;
		}
		update_pzl_pointers(whc, period, tmp_qh);
	}
}

/**
 * scan_periodic_work - scan the PZL for qsets to process.
 *
 * Process each qset in the PZL in turn and then signal the WHC that
 * the PZL has been updated.
 *
 * Then start, stop or update the periodic schedule as required.
 */
void scan_periodic_work(struct work_struct *work)
{
	struct whc *whc = container_of(work, struct whc, periodic_work);
	struct whc_qset *qset, *t;
	enum whc_update update = 0;
	int period;

	spin_lock_irq(&whc->lock);

	for (period = 4; period >= 0; period--) {
		list_for_each_entry_safe(qset, t, &whc->periodic_list[period], list_node) {
			if (!qset->in_hw_list)
				update |= WHC_UPDATE_ADDED;
			update |= pzl_process_qset(whc, qset);
		}
	}

	if (update & (WHC_UPDATE_ADDED | WHC_UPDATE_REMOVED))
		update_pzl_hw_view(whc);

	spin_unlock_irq(&whc->lock);

	if (update) {
		uint32_t wusbcmd = WUSBCMD_PERIODIC_UPDATED | WUSBCMD_PERIODIC_SYNCED_DB;
		if (update & WHC_UPDATE_REMOVED)
			wusbcmd |= WUSBCMD_PERIODIC_QSET_RM;
		pzl_update(whc, wusbcmd);
	}

	/*
	 * Now that the PZL is updated, complete the removal of any
	 * removed qsets.
	 */
	spin_lock_irq(&whc->lock);

	list_for_each_entry_safe(qset, t, &whc->periodic_removed_list, list_node) {
		qset_remove_complete(whc, qset);
	}

	spin_unlock_irq(&whc->lock);
}

/**
 * pzl_urb_enqueue - queue an URB onto the periodic list (PZL)
 * @whc: the WHCI host controller
 * @urb: the URB to enqueue
 * @mem_flags: flags for any memory allocations
 *
 * The qset for the endpoint is obtained and the urb queued on to it.
 *
 * Work is scheduled to update the hardware's view of the PZL.
 */
int pzl_urb_enqueue(struct whc *whc, struct urb *urb, gfp_t mem_flags)
{
	struct whc_qset *qset;
	int err;
	unsigned long flags;

	spin_lock_irqsave(&whc->lock, flags);

	qset = get_qset(whc, urb, GFP_ATOMIC);
	if (qset == NULL)
		err = -ENOMEM;
	else
		err = qset_add_urb(whc, qset, urb, GFP_ATOMIC);
	if (!err) {
		usb_hcd_link_urb_to_ep(&whc->wusbhc.usb_hcd, urb);
		if (!qset->in_sw_list)
			qset_insert_in_sw_list(whc, qset);
	}

	spin_unlock_irqrestore(&whc->lock, flags);

	if (!err)
		queue_work(whc->workqueue, &whc->periodic_work);

	return 0;
}

/**
 * pzl_urb_dequeue - remove an URB (qset) from the periodic list
 * @whc: the WHCI host controller
 * @urb: the URB to dequeue
 * @status: the current status of the URB
 *
 * URBs that do yet have qTDs can simply be removed from the software
 * queue, otherwise the qset must be removed so the qTDs can be safely
 * removed.
 */
int pzl_urb_dequeue(struct whc *whc, struct urb *urb, int status)
{
	struct whc_urb *wurb = urb->hcpriv;
	struct whc_qset *qset = wurb->qset;
	struct whc_std *std, *t;
	int ret;
	unsigned long flags;

	spin_lock_irqsave(&whc->lock, flags);

	ret = usb_hcd_check_unlink_urb(&whc->wusbhc.usb_hcd, urb, status);
	if (ret < 0)
		goto out;

	list_for_each_entry_safe(std, t, &qset->stds, list_node) {
		if (std->urb == urb)
			qset_free_std(whc, std);
		else
			std->qtd = NULL; /* so this std is re-added when the qset is */
	}

	pzl_qset_remove(whc, qset);
	wurb->status = status;
	wurb->is_async = false;
	queue_work(whc->workqueue, &wurb->dequeue_work);

out:
	spin_unlock_irqrestore(&whc->lock, flags);

	return ret;
}

/**
 * pzl_qset_delete - delete a qset from the PZL
 */
void pzl_qset_delete(struct whc *whc, struct whc_qset *qset)
{
	qset->remove = 1;
	queue_work(whc->workqueue, &whc->periodic_work);
	qset_delete(whc, qset);
}


/**
 * pzl_init - initialize the periodic zone list
 * @whc: the WHCI host controller
 */
int pzl_init(struct whc *whc)
{
	int i;

	whc->pz_list = dma_alloc_coherent(&whc->umc->dev, sizeof(u64) * 16,
					  &whc->pz_list_dma, GFP_KERNEL);
	if (whc->pz_list == NULL)
		return -ENOMEM;

	/* Set T bit on all elements in PZL. */
	for (i = 0; i < 16; i++)
		whc->pz_list[i] = cpu_to_le64(QH_LINK_NTDS(8) | QH_LINK_T);

	le_writeq(whc->pz_list_dma, whc->base + WUSBPERIODICLISTBASE);

	return 0;
}

/**
 * pzl_clean_up - free PZL resources
 * @whc: the WHCI host controller
 *
 * The PZL is stopped and empty.
 */
void pzl_clean_up(struct whc *whc)
{
	if (whc->pz_list)
		dma_free_coherent(&whc->umc->dev,  sizeof(u64) * 16, whc->pz_list,
				  whc->pz_list_dma);
}
Commit	Line	Data
7e6133aa DV	1	/*
	2	* Wireless Host Controller (WHC) periodic schedule management.
	3	*
	4	* Copyright (C) 2007 Cambridge Silicon Radio Ltd.
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License version
	8	* 2 as published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	17	*/
	18	#include <linux/kernel.h>
	19	#include <linux/dma-mapping.h>
	20	#include <linux/uwb/umc.h>
	21	#include <linux/usb.h>
7e6133aa DV	22
	23	#include "../../wusbcore/wusbhc.h"
	24
	25	#include "whcd.h"
	26
7e6133aa DV	27	static void update_pzl_pointers(struct whc *whc, int period, u64 addr)
	28	{
	29	switch (period) {
	30	case 0:
	31	whc_qset_set_link_ptr(&whc->pz_list[0], addr);
	32	whc_qset_set_link_ptr(&whc->pz_list[2], addr);
	33	whc_qset_set_link_ptr(&whc->pz_list[4], addr);
	34	whc_qset_set_link_ptr(&whc->pz_list[6], addr);
	35	whc_qset_set_link_ptr(&whc->pz_list[8], addr);
	36	whc_qset_set_link_ptr(&whc->pz_list[10], addr);
	37	whc_qset_set_link_ptr(&whc->pz_list[12], addr);
	38	whc_qset_set_link_ptr(&whc->pz_list[14], addr);
	39	break;
	40	case 1:
	41	whc_qset_set_link_ptr(&whc->pz_list[1], addr);
	42	whc_qset_set_link_ptr(&whc->pz_list[5], addr);
	43	whc_qset_set_link_ptr(&whc->pz_list[9], addr);
	44	whc_qset_set_link_ptr(&whc->pz_list[13], addr);
	45	break;
	46	case 2:
	47	whc_qset_set_link_ptr(&whc->pz_list[3], addr);
	48	whc_qset_set_link_ptr(&whc->pz_list[11], addr);
	49	break;
	50	case 3:
	51	whc_qset_set_link_ptr(&whc->pz_list[7], addr);
	52	break;
	53	case 4:
	54	whc_qset_set_link_ptr(&whc->pz_list[15], addr);
	55	break;
	56	}
	57	}
	58
	59	/*
	60	* Return the 'period' to use for this qset. The minimum interval for
	61	* the endpoint is used so whatever urbs are submitted the device is
	62	* polled often enough.
	63	*/
	64	static int qset_get_period(struct whc whc, struct whc_qset qset)
	65	{
	66	uint8_t bInterval = qset->ep->desc.bInterval;
	67
	68	if (bInterval < 6)
	69	bInterval = 6;
	70	if (bInterval > 10)
	71	bInterval = 10;
	72	return bInterval - 6;
	73	}
	74
	75	static void qset_insert_in_sw_list(struct whc whc, struct whc_qset qset)
	76	{
	77	int period;
	78
	79	period = qset_get_period(whc, qset);
	80
	81	qset_clear(whc, qset);
	82	list_move(&qset->list_node, &whc->periodic_list[period]);
	83	qset->in_sw_list = true;
	84	}
	85
	86	static void pzl_qset_remove(struct whc whc, struct whc_qset qset)
	87	{
	88	list_move(&qset->list_node, &whc->periodic_removed_list);
	89	qset->in_hw_list = false;
	90	qset->in_sw_list = false;
91	}
92
93	/**
94	* pzl_process_qset - process any recently inactivated or halted qTDs
95	* in a qset.
96	*
97	* After inactive qTDs are removed, new qTDs can be added if the
98	* urb queue still contains URBs.
99	*
100	* Returns the schedule updates required.
101	*/
102	static enum whc_update pzl_process_qset(struct whc whc, struct whc_qset qset)
103	{
104	enum whc_update update = 0;
105	uint32_t status = 0;
106
107	while (qset->ntds) {
108	struct whc_qtd *td;
109	int t;
110
111	t = qset->td_start;
112	td = &qset->qtd[qset->td_start];
113	status = le32_to_cpu(td->status);
114
115	/*
116	* Nothing to do with a still active qTD.
117	*/
118	if (status & QTD_STS_ACTIVE)
119	break;
120
121	if (status & QTD_STS_HALTED) {
122	/* Ug, an error. */
123	process_halted_qtd(whc, qset, td);
124	goto done;
125	}
126
127	/* Mmm, a completed qTD. */
128	process_inactive_qtd(whc, qset, td);
129	}
130
131	update \|= qset_add_qtds(whc, qset);
132
133	done:
134	/*
135	* If there are no qTDs in this qset, remove it from the PZL.
136	*/
137	if (qset->remove && qset->ntds == 0) {
138	pzl_qset_remove(whc, qset);
139	update \|= WHC_UPDATE_REMOVED;
140	}
141
142	return update;
143	}
144
145	/**
146	* pzl_start - start the periodic schedule
147	* @whc: the WHCI host controller
148	*
149	* The PZL must be valid (e.g., all entries in the list should have
150	* the T bit set).
151	*/
152	void pzl_start(struct whc *whc)
153	{
154	le_writeq(whc->pz_list_dma, whc->base + WUSBPERIODICLISTBASE);
155
156	whc_write_wusbcmd(whc, WUSBCMD_PERIODIC_EN, WUSBCMD_PERIODIC_EN);
157	whci_wait_for(&whc->umc->dev, whc->base + WUSBSTS,
158	WUSBSTS_PERIODIC_SCHED, WUSBSTS_PERIODIC_SCHED,
159	1000, "start PZL");
160	}
161
162	/**
163	* pzl_stop - stop the periodic schedule
164	* @whc: the WHCI host controller
165	*/
166	void pzl_stop(struct whc *whc)
167	{
168	whc_write_wusbcmd(whc, WUSBCMD_PERIODIC_EN, 0);
169	whci_wait_for(&whc->umc->dev, whc->base + WUSBSTS,
170	WUSBSTS_PERIODIC_SCHED, 0,
171	1000, "stop PZL");
172	}
173
56968d0c DV	174	/**
	175	* pzl_update - request a PZL update and wait for the hardware to be synced
	176	* @whc: the WHCI HC
	177	* @wusbcmd: WUSBCMD value to start the update.
	178	*
	179	* If the WUSB HC is inactive (i.e., the PZL is stopped) then the
	180	* update must be skipped as the hardware may not respond to update
	181	* requests.
	182	*/
7e6133aa DV	183	void pzl_update(struct whc *whc, uint32_t wusbcmd)
7e6133aa DV	184	{
56968d0c	185	struct wusbhc *wusbhc = &whc->wusbhc;
a5e6ced5	186	long t;
56968d0c DV	187
	188	mutex_lock(&wusbhc->mutex);
	189	if (wusbhc->active) {
	190	whc_write_wusbcmd(whc, wusbcmd, wusbcmd);
a5e6ced5 DV	191	t = wait_event_timeout(
	192	whc->periodic_list_wq,
	193	(le_readl(whc->base + WUSBCMD) & WUSBCMD_PERIODIC_UPDATED) == 0,
	194	msecs_to_jiffies(1000));
	195	if (t == 0)
	196	whc_hw_error(whc, "PZL update timeout");
56968d0c DV	197	}
56968d0c DV	198	mutex_unlock(&wusbhc->mutex);
7e6133aa DV	199	}
	200
	201	static void update_pzl_hw_view(struct whc *whc)
	202	{
	203	struct whc_qset qset, t;
	204	int period;
	205	u64 tmp_qh = 0;
	206
	207	for (period = 0; period < 5; period++) {
	208	list_for_each_entry_safe(qset, t, &whc->periodic_list[period], list_node) {
	209	whc_qset_set_link_ptr(&qset->qh.link, tmp_qh);
	210	tmp_qh = qset->qset_dma;
	211	qset->in_hw_list = true;
	212	}
	213	update_pzl_pointers(whc, period, tmp_qh);
	214	}
	215	}
	216
	217	/**
	218	* scan_periodic_work - scan the PZL for qsets to process.
	219	*
	220	* Process each qset in the PZL in turn and then signal the WHC that
	221	* the PZL has been updated.
	222	*
	223	* Then start, stop or update the periodic schedule as required.
	224	*/
	225	void scan_periodic_work(struct work_struct *work)
	226	{
	227	struct whc *whc = container_of(work, struct whc, periodic_work);
	228	struct whc_qset qset, t;
	229	enum whc_update update = 0;
	230	int period;
	231
	232	spin_lock_irq(&whc->lock);
	233
7e6133aa DV	234	for (period = 4; period >= 0; period--) {
	235	list_for_each_entry_safe(qset, t, &whc->periodic_list[period], list_node) {
	236	if (!qset->in_hw_list)
	237	update \|= WHC_UPDATE_ADDED;
	238	update \|= pzl_process_qset(whc, qset);
	239	}
	240	}
	241
	242	if (update & (WHC_UPDATE_ADDED \| WHC_UPDATE_REMOVED))
	243	update_pzl_hw_view(whc);
	244
7e6133aa DV	245	spin_unlock_irq(&whc->lock);
	246
	247	if (update) {
	248	uint32_t wusbcmd = WUSBCMD_PERIODIC_UPDATED \| WUSBCMD_PERIODIC_SYNCED_DB;
	249	if (update & WHC_UPDATE_REMOVED)
	250	wusbcmd \|= WUSBCMD_PERIODIC_QSET_RM;
	251	pzl_update(whc, wusbcmd);
	252	}
	253
	254	/*
	255	* Now that the PZL is updated, complete the removal of any
	256	* removed qsets.
	257	*/
a3c1239e	258	spin_lock_irq(&whc->lock);
7e6133aa DV	259
	260	list_for_each_entry_safe(qset, t, &whc->periodic_removed_list, list_node) {
	261	qset_remove_complete(whc, qset);
	262	}
	263
a3c1239e	264	spin_unlock_irq(&whc->lock);
7e6133aa DV	265	}
	266
	267	/**
	268	* pzl_urb_enqueue - queue an URB onto the periodic list (PZL)
	269	* @whc: the WHCI host controller
	270	* @urb: the URB to enqueue
	271	* @mem_flags: flags for any memory allocations
	272	*
	273	* The qset for the endpoint is obtained and the urb queued on to it.
	274	*
	275	* Work is scheduled to update the hardware's view of the PZL.
	276	*/
	277	int pzl_urb_enqueue(struct whc whc, struct urb urb, gfp_t mem_flags)
	278	{
	279	struct whc_qset *qset;
	280	int err;
	281	unsigned long flags;
	282
	283	spin_lock_irqsave(&whc->lock, flags);
	284
	285	qset = get_qset(whc, urb, GFP_ATOMIC);
	286	if (qset == NULL)
	287	err = -ENOMEM;
	288	else
	289	err = qset_add_urb(whc, qset, urb, GFP_ATOMIC);
	290	if (!err) {
	291	usb_hcd_link_urb_to_ep(&whc->wusbhc.usb_hcd, urb);
	292	if (!qset->in_sw_list)
	293	qset_insert_in_sw_list(whc, qset);
	294	}
	295
	296	spin_unlock_irqrestore(&whc->lock, flags);
	297
	298	if (!err)
	299	queue_work(whc->workqueue, &whc->periodic_work);
	300
	301	return 0;
	302	}
	303
	304	/**
	305	* pzl_urb_dequeue - remove an URB (qset) from the periodic list
	306	* @whc: the WHCI host controller
	307	* @urb: the URB to dequeue
	308	* @status: the current status of the URB
	309	*
	310	* URBs that do yet have qTDs can simply be removed from the software
	311	* queue, otherwise the qset must be removed so the qTDs can be safely
	312	* removed.
	313	*/
	314	int pzl_urb_dequeue(struct whc whc, struct urb urb, int status)
	315	{
	316	struct whc_urb *wurb = urb->hcpriv;
	317	struct whc_qset *qset = wurb->qset;
	318	struct whc_std std, t;
	319	int ret;
	320	unsigned long flags;
	321
	322	spin_lock_irqsave(&whc->lock, flags);
	323
	324	ret = usb_hcd_check_unlink_urb(&whc->wusbhc.usb_hcd, urb, status);
	325	if (ret < 0)
	326	goto out;
	327
	328	list_for_each_entry_safe(std, t, &qset->stds, list_node) {
329	if (std->urb == urb)
330	qset_free_std(whc, std);
331	else
332	std->qtd = NULL; /* so this std is re-added when the qset is */
333	}
334
335	pzl_qset_remove(whc, qset);
336	wurb->status = status;
337	wurb->is_async = false;
338	queue_work(whc->workqueue, &wurb->dequeue_work);
339
340	out:
341	spin_unlock_irqrestore(&whc->lock, flags);
342
343	return ret;
344	}
345
346	/**
347	* pzl_qset_delete - delete a qset from the PZL
348	*/
349	void pzl_qset_delete(struct whc whc, struct whc_qset qset)
350	{
351	qset->remove = 1;
352	queue_work(whc->workqueue, &whc->periodic_work);
353	qset_delete(whc, qset);
354	}
355
356
357	/**
358	* pzl_init - initialize the periodic zone list
359	* @whc: the WHCI host controller
360	*/
361	int pzl_init(struct whc *whc)
362	{
363	int i;
364
365	whc->pz_list = dma_alloc_coherent(&whc->umc->dev, sizeof(u64) * 16,
366	&whc->pz_list_dma, GFP_KERNEL);
367	if (whc->pz_list == NULL)
368	return -ENOMEM;
369
370	/* Set T bit on all elements in PZL. */
371	for (i = 0; i < 16; i++)
372	whc->pz_list[i] = cpu_to_le64(QH_LINK_NTDS(8) \| QH_LINK_T);
373
374	le_writeq(whc->pz_list_dma, whc->base + WUSBPERIODICLISTBASE);
375
376	return 0;
377	}
378
379	/**
380	* pzl_clean_up - free PZL resources
381	* @whc: the WHCI host controller
382	*
383	* The PZL is stopped and empty.
384	*/
385	void pzl_clean_up(struct whc *whc)
386	{
387	if (whc->pz_list)
388	dma_free_coherent(&whc->umc->dev, sizeof(u64) * 16, whc->pz_list,
389	whc->pz_list_dma);
390	}