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path: root/drivers/usb/host/whci/asl.c
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Diffstat (limited to 'drivers/usb/host/whci/asl.c')
-rw-r--r--drivers/usb/host/whci/asl.c376
1 files changed, 0 insertions, 376 deletions
diff --git a/drivers/usb/host/whci/asl.c b/drivers/usb/host/whci/asl.c
deleted file mode 100644
index 276fb34c8efd..000000000000
--- a/drivers/usb/host/whci/asl.c
+++ /dev/null
@@ -1,376 +0,0 @@
-// 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- * it's no longer valid.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);
- }
-}