Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
David Vrabel | 1466 | 99.66% | 9 | 75.00% |
Tejun Heo | 3 | 0.20% | 1 | 8.33% |
Greg Kroah-Hartman | 2 | 0.14% | 2 | 16.67% |
Total | 1471 | 12 |
// SPDX-License-Identifier: GPL-2.0 /* * Wireless Host Controller (WHC) asynchronous schedule management. * * Copyright (C) 2007 Cambridge Silicon Radio Ltd. */ #include <linux/kernel.h> #include <linux/gfp.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 The caller must stop the ASL as * it's no longer valid.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; 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); } }
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