mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
![David Vrabel](/assets/img/avatar_default.png)
A halted qTD always triggers a hardware list update because the qset was either removed or reactivated. Signed-off-by: David Vrabel <david.vrabel@csr.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
388 lines
9.5 KiB
C
388 lines
9.5 KiB
C
/*
|
|
* Wireless Host Controller (WHC) asynchronous 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 qset_get_next_prev(struct whc *whc, struct whc_qset *qset,
|
|
struct whc_qset **next, struct whc_qset **prev)
|
|
{
|
|
struct list_head *n, *p;
|
|
|
|
BUG_ON(list_empty(&whc->async_list));
|
|
|
|
n = qset->list_node.next;
|
|
if (n == &whc->async_list)
|
|
n = n->next;
|
|
p = qset->list_node.prev;
|
|
if (p == &whc->async_list)
|
|
p = p->prev;
|
|
|
|
*next = container_of(n, struct whc_qset, list_node);
|
|
*prev = container_of(p, struct whc_qset, list_node);
|
|
|
|
}
|
|
|
|
static void asl_qset_insert_begin(struct whc *whc, struct whc_qset *qset)
|
|
{
|
|
list_move(&qset->list_node, &whc->async_list);
|
|
qset->in_sw_list = true;
|
|
}
|
|
|
|
static void asl_qset_insert(struct whc *whc, struct whc_qset *qset)
|
|
{
|
|
struct whc_qset *next, *prev;
|
|
|
|
qset_clear(whc, qset);
|
|
|
|
/* Link into ASL. */
|
|
qset_get_next_prev(whc, qset, &next, &prev);
|
|
whc_qset_set_link_ptr(&qset->qh.link, next->qset_dma);
|
|
whc_qset_set_link_ptr(&prev->qh.link, qset->qset_dma);
|
|
qset->in_hw_list = true;
|
|
}
|
|
|
|
static void asl_qset_remove(struct whc *whc, struct whc_qset *qset)
|
|
{
|
|
struct whc_qset *prev, *next;
|
|
|
|
qset_get_next_prev(whc, qset, &next, &prev);
|
|
|
|
list_move(&qset->list_node, &whc->async_removed_list);
|
|
qset->in_sw_list = false;
|
|
|
|
/*
|
|
* No more qsets in the ASL? The caller must stop the ASL as
|
|
* it's no longer valid.
|
|
*/
|
|
if (list_empty(&whc->async_list))
|
|
return;
|
|
|
|
/* Remove from ASL. */
|
|
whc_qset_set_link_ptr(&prev->qh.link, next->qset_dma);
|
|
qset->in_hw_list = false;
|
|
}
|
|
|
|
/**
|
|
* 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 any additional WUSBCMD bits for the ASL sync command (i.e.,
|
|
* WUSBCMD_ASYNC_QSET_RM if a halted qset was removed).
|
|
*/
|
|
static uint32_t 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);
|
|
/* A halted qTD always triggers an update
|
|
because the qset was either removed or
|
|
reactivated. */
|
|
update |= WHC_UPDATE_UPDATED;
|
|
goto done;
|
|
}
|
|
|
|
/* Mmm, a completed qTD. */
|
|
process_inactive_qtd(whc, qset, td);
|
|
}
|
|
|
|
if (!qset->remove)
|
|
update |= qset_add_qtds(whc, qset);
|
|
|
|
done:
|
|
/*
|
|
* Remove this qset from the ASL if requested, but only if has
|
|
* no qTDs.
|
|
*/
|
|
if (qset->remove && qset->ntds == 0) {
|
|
asl_qset_remove(whc, qset);
|
|
update |= WHC_UPDATE_REMOVED;
|
|
}
|
|
return update;
|
|
}
|
|
|
|
void asl_start(struct whc *whc)
|
|
{
|
|
struct whc_qset *qset;
|
|
|
|
qset = list_first_entry(&whc->async_list, struct whc_qset, list_node);
|
|
|
|
le_writeq(qset->qset_dma | QH_LINK_NTDS(8), whc->base + WUSBASYNCLISTADDR);
|
|
|
|
whc_write_wusbcmd(whc, WUSBCMD_ASYNC_EN, WUSBCMD_ASYNC_EN);
|
|
whci_wait_for(&whc->umc->dev, whc->base + WUSBSTS,
|
|
WUSBSTS_ASYNC_SCHED, WUSBSTS_ASYNC_SCHED,
|
|
1000, "start ASL");
|
|
}
|
|
|
|
void asl_stop(struct whc *whc)
|
|
{
|
|
whc_write_wusbcmd(whc, WUSBCMD_ASYNC_EN, 0);
|
|
whci_wait_for(&whc->umc->dev, whc->base + WUSBSTS,
|
|
WUSBSTS_ASYNC_SCHED, 0,
|
|
1000, "stop ASL");
|
|
}
|
|
|
|
/**
|
|
* asl_update - request an ASL 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 ASL is stopped) then the
|
|
* update must be skipped as the hardware may not respond to update
|
|
* requests.
|
|
*/
|
|
void asl_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->async_list_wq,
|
|
(le_readl(whc->base + WUSBCMD) & WUSBCMD_ASYNC_UPDATED) == 0,
|
|
msecs_to_jiffies(1000));
|
|
if (t == 0)
|
|
whc_hw_error(whc, "ASL update timeout");
|
|
}
|
|
mutex_unlock(&wusbhc->mutex);
|
|
}
|
|
|
|
/**
|
|
* scan_async_work - scan the ASL for qsets to process.
|
|
*
|
|
* Process each qset in the ASL in turn and then signal the WHC that
|
|
* the ASL has been updated.
|
|
*
|
|
* Then start, stop or update the asynchronous schedule as required.
|
|
*/
|
|
void scan_async_work(struct work_struct *work)
|
|
{
|
|
struct whc *whc = container_of(work, struct whc, async_work);
|
|
struct whc_qset *qset, *t;
|
|
enum whc_update update = 0;
|
|
|
|
spin_lock_irq(&whc->lock);
|
|
|
|
/*
|
|
* Transerve the software list backwards so new qsets can be
|
|
* safely inserted into the ASL without making it non-circular.
|
|
*/
|
|
list_for_each_entry_safe_reverse(qset, t, &whc->async_list, list_node) {
|
|
if (!qset->in_hw_list) {
|
|
asl_qset_insert(whc, qset);
|
|
update |= WHC_UPDATE_ADDED;
|
|
}
|
|
|
|
update |= process_qset(whc, qset);
|
|
}
|
|
|
|
spin_unlock_irq(&whc->lock);
|
|
|
|
if (update) {
|
|
uint32_t wusbcmd = WUSBCMD_ASYNC_UPDATED | WUSBCMD_ASYNC_SYNCED_DB;
|
|
if (update & WHC_UPDATE_REMOVED)
|
|
wusbcmd |= WUSBCMD_ASYNC_QSET_RM;
|
|
asl_update(whc, wusbcmd);
|
|
}
|
|
|
|
/*
|
|
* Now that the ASL is updated, complete the removal of any
|
|
* removed qsets.
|
|
*
|
|
* If the qset was to be reset, do so and reinsert it into the
|
|
* ASL if it has pending transfers.
|
|
*/
|
|
spin_lock_irq(&whc->lock);
|
|
|
|
list_for_each_entry_safe(qset, t, &whc->async_removed_list, list_node) {
|
|
qset_remove_complete(whc, qset);
|
|
if (qset->reset) {
|
|
qset_reset(whc, qset);
|
|
if (!list_empty(&qset->stds)) {
|
|
asl_qset_insert_begin(whc, qset);
|
|
queue_work(whc->workqueue, &whc->async_work);
|
|
}
|
|
}
|
|
}
|
|
|
|
spin_unlock_irq(&whc->lock);
|
|
}
|
|
|
|
/**
|
|
* asl_urb_enqueue - queue an URB onto the asynchronous list (ASL).
|
|
* @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 ASL.
|
|
*/
|
|
int asl_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);
|
|
|
|
err = usb_hcd_link_urb_to_ep(&whc->wusbhc.usb_hcd, urb);
|
|
if (err < 0) {
|
|
spin_unlock_irqrestore(&whc->lock, flags);
|
|
return err;
|
|
}
|
|
|
|
qset = get_qset(whc, urb, GFP_ATOMIC);
|
|
if (qset == NULL)
|
|
err = -ENOMEM;
|
|
else
|
|
err = qset_add_urb(whc, qset, urb, GFP_ATOMIC);
|
|
if (!err) {
|
|
if (!qset->in_sw_list && !qset->remove)
|
|
asl_qset_insert_begin(whc, qset);
|
|
} else
|
|
usb_hcd_unlink_urb_from_ep(&whc->wusbhc.usb_hcd, urb);
|
|
|
|
spin_unlock_irqrestore(&whc->lock, flags);
|
|
|
|
if (!err)
|
|
queue_work(whc->workqueue, &whc->async_work);
|
|
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* asl_urb_dequeue - remove an URB (qset) from the async 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 from the ASL so the qTDs
|
|
* can be removed.
|
|
*/
|
|
int asl_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;
|
|
bool has_qtd = false;
|
|
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) {
|
|
if (std->qtd)
|
|
has_qtd = true;
|
|
qset_free_std(whc, std);
|
|
} else
|
|
std->qtd = NULL; /* so this std is re-added when the qset is */
|
|
}
|
|
|
|
if (has_qtd) {
|
|
asl_qset_remove(whc, qset);
|
|
wurb->status = status;
|
|
wurb->is_async = true;
|
|
queue_work(whc->workqueue, &wurb->dequeue_work);
|
|
} else
|
|
qset_remove_urb(whc, qset, urb, status);
|
|
out:
|
|
spin_unlock_irqrestore(&whc->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* asl_qset_delete - delete a qset from the ASL
|
|
*/
|
|
void asl_qset_delete(struct whc *whc, struct whc_qset *qset)
|
|
{
|
|
qset->remove = 1;
|
|
queue_work(whc->workqueue, &whc->async_work);
|
|
qset_delete(whc, qset);
|
|
}
|
|
|
|
/**
|
|
* asl_init - initialize the asynchronous schedule list
|
|
*
|
|
* A dummy qset with no qTDs is added to the ASL to simplify removing
|
|
* qsets (no need to stop the ASL when the last qset is removed).
|
|
*/
|
|
int asl_init(struct whc *whc)
|
|
{
|
|
struct whc_qset *qset;
|
|
|
|
qset = qset_alloc(whc, GFP_KERNEL);
|
|
if (qset == NULL)
|
|
return -ENOMEM;
|
|
|
|
asl_qset_insert_begin(whc, qset);
|
|
asl_qset_insert(whc, qset);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* asl_clean_up - free ASL resources
|
|
*
|
|
* The ASL is stopped and empty except for the dummy qset.
|
|
*/
|
|
void asl_clean_up(struct whc *whc)
|
|
{
|
|
struct whc_qset *qset;
|
|
|
|
if (!list_empty(&whc->async_list)) {
|
|
qset = list_first_entry(&whc->async_list, struct whc_qset, list_node);
|
|
list_del(&qset->list_node);
|
|
qset_free(whc, qset);
|
|
}
|
|
}
|