418 lines
10 KiB
C
418 lines
10 KiB
C
/*
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* Wireless Host Controller (WHC) periodic schedule management.
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*
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* Copyright (C) 2007 Cambridge Silicon Radio Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/kernel.h>
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#include <linux/gfp.h>
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#include <linux/dma-mapping.h>
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#include <linux/uwb/umc.h>
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#include <linux/usb.h>
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#include "../../wusbcore/wusbhc.h"
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#include "whcd.h"
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static void update_pzl_pointers(struct whc *whc, int period, u64 addr)
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{
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switch (period) {
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case 0:
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whc_qset_set_link_ptr(&whc->pz_list[0], addr);
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whc_qset_set_link_ptr(&whc->pz_list[2], addr);
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whc_qset_set_link_ptr(&whc->pz_list[4], addr);
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whc_qset_set_link_ptr(&whc->pz_list[6], addr);
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whc_qset_set_link_ptr(&whc->pz_list[8], addr);
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whc_qset_set_link_ptr(&whc->pz_list[10], addr);
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whc_qset_set_link_ptr(&whc->pz_list[12], addr);
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whc_qset_set_link_ptr(&whc->pz_list[14], addr);
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break;
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case 1:
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whc_qset_set_link_ptr(&whc->pz_list[1], addr);
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whc_qset_set_link_ptr(&whc->pz_list[5], addr);
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whc_qset_set_link_ptr(&whc->pz_list[9], addr);
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whc_qset_set_link_ptr(&whc->pz_list[13], addr);
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break;
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case 2:
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whc_qset_set_link_ptr(&whc->pz_list[3], addr);
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whc_qset_set_link_ptr(&whc->pz_list[11], addr);
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break;
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case 3:
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whc_qset_set_link_ptr(&whc->pz_list[7], addr);
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break;
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case 4:
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whc_qset_set_link_ptr(&whc->pz_list[15], addr);
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break;
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}
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}
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/*
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* Return the 'period' to use for this qset. The minimum interval for
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* the endpoint is used so whatever urbs are submitted the device is
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* polled often enough.
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*/
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static int qset_get_period(struct whc *whc, struct whc_qset *qset)
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{
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uint8_t bInterval = qset->ep->desc.bInterval;
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if (bInterval < 6)
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bInterval = 6;
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if (bInterval > 10)
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bInterval = 10;
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return bInterval - 6;
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}
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static void qset_insert_in_sw_list(struct whc *whc, struct whc_qset *qset)
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{
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int period;
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period = qset_get_period(whc, qset);
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qset_clear(whc, qset);
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list_move(&qset->list_node, &whc->periodic_list[period]);
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qset->in_sw_list = true;
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}
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static void pzl_qset_remove(struct whc *whc, struct whc_qset *qset)
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{
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list_move(&qset->list_node, &whc->periodic_removed_list);
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qset->in_hw_list = false;
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qset->in_sw_list = false;
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}
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/**
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* pzl_process_qset - process any recently inactivated or halted qTDs
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* in a qset.
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*
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* After inactive qTDs are removed, new qTDs can be added if the
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* urb queue still contains URBs.
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*
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* Returns the schedule updates required.
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*/
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static enum whc_update pzl_process_qset(struct whc *whc, struct whc_qset *qset)
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{
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enum whc_update update = 0;
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uint32_t status = 0;
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while (qset->ntds) {
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struct whc_qtd *td;
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int t;
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t = qset->td_start;
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td = &qset->qtd[qset->td_start];
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status = le32_to_cpu(td->status);
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/*
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* Nothing to do with a still active qTD.
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*/
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if (status & QTD_STS_ACTIVE)
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break;
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if (status & QTD_STS_HALTED) {
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/* Ug, an error. */
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process_halted_qtd(whc, qset, td);
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/* A halted qTD always triggers an update
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because the qset was either removed or
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reactivated. */
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update |= WHC_UPDATE_UPDATED;
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goto done;
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}
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/* Mmm, a completed qTD. */
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process_inactive_qtd(whc, qset, td);
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}
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if (!qset->remove)
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update |= qset_add_qtds(whc, qset);
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done:
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/*
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* If there are no qTDs in this qset, remove it from the PZL.
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*/
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if (qset->remove && qset->ntds == 0) {
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pzl_qset_remove(whc, qset);
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update |= WHC_UPDATE_REMOVED;
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}
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return update;
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}
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/**
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* pzl_start - start the periodic schedule
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* @whc: the WHCI host controller
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*
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* The PZL must be valid (e.g., all entries in the list should have
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* the T bit set).
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*/
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void pzl_start(struct whc *whc)
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{
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le_writeq(whc->pz_list_dma, whc->base + WUSBPERIODICLISTBASE);
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whc_write_wusbcmd(whc, WUSBCMD_PERIODIC_EN, WUSBCMD_PERIODIC_EN);
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whci_wait_for(&whc->umc->dev, whc->base + WUSBSTS,
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WUSBSTS_PERIODIC_SCHED, WUSBSTS_PERIODIC_SCHED,
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1000, "start PZL");
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}
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/**
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* pzl_stop - stop the periodic schedule
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* @whc: the WHCI host controller
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*/
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void pzl_stop(struct whc *whc)
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{
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whc_write_wusbcmd(whc, WUSBCMD_PERIODIC_EN, 0);
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whci_wait_for(&whc->umc->dev, whc->base + WUSBSTS,
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WUSBSTS_PERIODIC_SCHED, 0,
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1000, "stop PZL");
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}
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/**
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* pzl_update - request a PZL update and wait for the hardware to be synced
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* @whc: the WHCI HC
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* @wusbcmd: WUSBCMD value to start the update.
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*
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* If the WUSB HC is inactive (i.e., the PZL is stopped) then the
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* update must be skipped as the hardware may not respond to update
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* requests.
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*/
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void pzl_update(struct whc *whc, uint32_t wusbcmd)
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{
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struct wusbhc *wusbhc = &whc->wusbhc;
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long t;
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mutex_lock(&wusbhc->mutex);
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if (wusbhc->active) {
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whc_write_wusbcmd(whc, wusbcmd, wusbcmd);
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t = wait_event_timeout(
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whc->periodic_list_wq,
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(le_readl(whc->base + WUSBCMD) & WUSBCMD_PERIODIC_UPDATED) == 0,
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msecs_to_jiffies(1000));
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if (t == 0)
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whc_hw_error(whc, "PZL update timeout");
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}
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mutex_unlock(&wusbhc->mutex);
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}
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static void update_pzl_hw_view(struct whc *whc)
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{
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struct whc_qset *qset, *t;
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int period;
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u64 tmp_qh = 0;
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for (period = 0; period < 5; period++) {
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list_for_each_entry_safe(qset, t, &whc->periodic_list[period], list_node) {
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whc_qset_set_link_ptr(&qset->qh.link, tmp_qh);
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tmp_qh = qset->qset_dma;
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qset->in_hw_list = true;
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}
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update_pzl_pointers(whc, period, tmp_qh);
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}
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}
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/**
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* scan_periodic_work - scan the PZL for qsets to process.
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*
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* Process each qset in the PZL in turn and then signal the WHC that
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* the PZL has been updated.
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*
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* Then start, stop or update the periodic schedule as required.
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*/
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void scan_periodic_work(struct work_struct *work)
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{
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struct whc *whc = container_of(work, struct whc, periodic_work);
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struct whc_qset *qset, *t;
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enum whc_update update = 0;
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int period;
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spin_lock_irq(&whc->lock);
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for (period = 4; period >= 0; period--) {
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list_for_each_entry_safe(qset, t, &whc->periodic_list[period], list_node) {
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if (!qset->in_hw_list)
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update |= WHC_UPDATE_ADDED;
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update |= pzl_process_qset(whc, qset);
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}
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}
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if (update & (WHC_UPDATE_ADDED | WHC_UPDATE_REMOVED))
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update_pzl_hw_view(whc);
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spin_unlock_irq(&whc->lock);
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if (update) {
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uint32_t wusbcmd = WUSBCMD_PERIODIC_UPDATED | WUSBCMD_PERIODIC_SYNCED_DB;
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if (update & WHC_UPDATE_REMOVED)
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wusbcmd |= WUSBCMD_PERIODIC_QSET_RM;
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pzl_update(whc, wusbcmd);
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}
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/*
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* Now that the PZL is updated, complete the removal of any
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* removed qsets.
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*
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* If the qset was to be reset, do so and reinsert it into the
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* PZL if it has pending transfers.
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*/
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spin_lock_irq(&whc->lock);
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list_for_each_entry_safe(qset, t, &whc->periodic_removed_list, list_node) {
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qset_remove_complete(whc, qset);
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if (qset->reset) {
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qset_reset(whc, qset);
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if (!list_empty(&qset->stds)) {
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qset_insert_in_sw_list(whc, qset);
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queue_work(whc->workqueue, &whc->periodic_work);
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}
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}
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}
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spin_unlock_irq(&whc->lock);
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}
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/**
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* pzl_urb_enqueue - queue an URB onto the periodic list (PZL)
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* @whc: the WHCI host controller
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* @urb: the URB to enqueue
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* @mem_flags: flags for any memory allocations
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*
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* The qset for the endpoint is obtained and the urb queued on to it.
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*
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* Work is scheduled to update the hardware's view of the PZL.
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*/
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int pzl_urb_enqueue(struct whc *whc, struct urb *urb, gfp_t mem_flags)
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{
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struct whc_qset *qset;
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int err;
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unsigned long flags;
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spin_lock_irqsave(&whc->lock, flags);
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err = usb_hcd_link_urb_to_ep(&whc->wusbhc.usb_hcd, urb);
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if (err < 0) {
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spin_unlock_irqrestore(&whc->lock, flags);
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return err;
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}
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qset = get_qset(whc, urb, GFP_ATOMIC);
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if (qset == NULL)
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err = -ENOMEM;
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else
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err = qset_add_urb(whc, qset, urb, GFP_ATOMIC);
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if (!err) {
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if (!qset->in_sw_list && !qset->remove)
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qset_insert_in_sw_list(whc, qset);
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} else
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usb_hcd_unlink_urb_from_ep(&whc->wusbhc.usb_hcd, urb);
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spin_unlock_irqrestore(&whc->lock, flags);
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if (!err)
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queue_work(whc->workqueue, &whc->periodic_work);
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return err;
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}
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/**
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* pzl_urb_dequeue - remove an URB (qset) from the periodic list
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* @whc: the WHCI host controller
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* @urb: the URB to dequeue
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* @status: the current status of the URB
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*
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* URBs that do yet have qTDs can simply be removed from the software
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* queue, otherwise the qset must be removed so the qTDs can be safely
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* removed.
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*/
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int pzl_urb_dequeue(struct whc *whc, struct urb *urb, int status)
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{
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struct whc_urb *wurb = urb->hcpriv;
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struct whc_qset *qset = wurb->qset;
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struct whc_std *std, *t;
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bool has_qtd = false;
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int ret;
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unsigned long flags;
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spin_lock_irqsave(&whc->lock, flags);
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ret = usb_hcd_check_unlink_urb(&whc->wusbhc.usb_hcd, urb, status);
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if (ret < 0)
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goto out;
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list_for_each_entry_safe(std, t, &qset->stds, list_node) {
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if (std->urb == urb) {
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if (std->qtd)
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has_qtd = true;
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qset_free_std(whc, std);
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} else
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std->qtd = NULL; /* so this std is re-added when the qset is */
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}
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if (has_qtd) {
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pzl_qset_remove(whc, qset);
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update_pzl_hw_view(whc);
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wurb->status = status;
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wurb->is_async = false;
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queue_work(whc->workqueue, &wurb->dequeue_work);
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} else
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qset_remove_urb(whc, qset, urb, status);
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out:
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spin_unlock_irqrestore(&whc->lock, flags);
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return ret;
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}
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/**
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* pzl_qset_delete - delete a qset from the PZL
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*/
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void pzl_qset_delete(struct whc *whc, struct whc_qset *qset)
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{
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qset->remove = 1;
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queue_work(whc->workqueue, &whc->periodic_work);
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qset_delete(whc, qset);
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}
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/**
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* pzl_init - initialize the periodic zone list
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* @whc: the WHCI host controller
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*/
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int pzl_init(struct whc *whc)
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{
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int i;
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whc->pz_list = dma_alloc_coherent(&whc->umc->dev, sizeof(u64) * 16,
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&whc->pz_list_dma, GFP_KERNEL);
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if (whc->pz_list == NULL)
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return -ENOMEM;
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/* Set T bit on all elements in PZL. */
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for (i = 0; i < 16; i++)
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whc->pz_list[i] = cpu_to_le64(QH_LINK_NTDS(8) | QH_LINK_T);
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le_writeq(whc->pz_list_dma, whc->base + WUSBPERIODICLISTBASE);
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return 0;
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}
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/**
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* pzl_clean_up - free PZL resources
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* @whc: the WHCI host controller
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*
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* The PZL is stopped and empty.
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*/
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void pzl_clean_up(struct whc *whc)
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{
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if (whc->pz_list)
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dma_free_coherent(&whc->umc->dev, sizeof(u64) * 16, whc->pz_list,
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whc->pz_list_dma);
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}
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