--- /dev/null
+/*
+ * This file is part of wl1271
+ *
+ * Copyright (C) 2008-2009 Nokia Corporation
+ *
+ * Contact: Luciano Coelho <luciano.coelho@nokia.com>
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include "ps.h"
+#include "io.h"
+#include "tx.h"
+#include "debug.h"
+
+#define WL1271_WAKEUP_TIMEOUT 500
+
+#define ELP_ENTRY_DELAY 30
+#define ELP_ENTRY_DELAY_FORCE_PS 5
+
+void wl1271_elp_work(struct work_struct *work)
+{
+ struct delayed_work *dwork;
+ struct wl1271 *wl;
+ struct wl12xx_vif *wlvif;
+ int ret;
+
+ dwork = container_of(work, struct delayed_work, work);
+ wl = container_of(dwork, struct wl1271, elp_work);
+
+ wl1271_debug(DEBUG_PSM, "elp work");
+
+ mutex_lock(&wl->mutex);
+
+ if (unlikely(wl->state != WLCORE_STATE_ON))
+ goto out;
+
+ /* our work might have been already cancelled */
+ if (unlikely(!test_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags)))
+ goto out;
+
+ if (test_bit(WL1271_FLAG_IN_ELP, &wl->flags))
+ goto out;
+
+ wl12xx_for_each_wlvif(wl, wlvif) {
+ if (!test_bit(WLVIF_FLAG_IN_PS, &wlvif->flags) &&
+ test_bit(WLVIF_FLAG_IN_USE, &wlvif->flags))
+ goto out;
+ }
+
+ wl1271_debug(DEBUG_PSM, "chip to elp");
+ ret = wlcore_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG, ELPCTRL_SLEEP);
+ if (ret < 0) {
+ wl12xx_queue_recovery_work(wl);
+ goto out;
+ }
+
+ set_bit(WL1271_FLAG_IN_ELP, &wl->flags);
+
+out:
+ mutex_unlock(&wl->mutex);
+}
+
+/* Routines to toggle sleep mode while in ELP */
+void wl1271_ps_elp_sleep(struct wl1271 *wl)
+{
+ struct wl12xx_vif *wlvif;
+ u32 timeout;
+
+ /* We do not enter elp sleep in PLT mode */
+ if (wl->plt)
+ return;
+
+ if (wl->sleep_auth != WL1271_PSM_ELP)
+ return;
+
+ /* we shouldn't get consecutive sleep requests */
+ if (WARN_ON(test_and_set_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags)))
+ return;
+
+ wl12xx_for_each_wlvif(wl, wlvif) {
+ if (!test_bit(WLVIF_FLAG_IN_PS, &wlvif->flags) &&
+ test_bit(WLVIF_FLAG_IN_USE, &wlvif->flags))
+ return;
+ }
+
+ timeout = wl->conf.conn.forced_ps ?
+ ELP_ENTRY_DELAY_FORCE_PS : ELP_ENTRY_DELAY;
+ ieee80211_queue_delayed_work(wl->hw, &wl->elp_work,
+ msecs_to_jiffies(timeout));
+}
+EXPORT_SYMBOL_GPL(wl1271_ps_elp_sleep);
+
+int wl1271_ps_elp_wakeup(struct wl1271 *wl)
+{
+ DECLARE_COMPLETION_ONSTACK(compl);
+ unsigned long flags;
+ int ret;
+ unsigned long start_time = jiffies;
+ bool pending = false;
+
+ /*
+ * we might try to wake up even if we didn't go to sleep
+ * before (e.g. on boot)
+ */
+ if (!test_and_clear_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags))
+ return 0;
+
+ /* don't cancel_sync as it might contend for a mutex and deadlock */
+ cancel_delayed_work(&wl->elp_work);
+
+ if (!test_bit(WL1271_FLAG_IN_ELP, &wl->flags))
+ return 0;
+
+ wl1271_debug(DEBUG_PSM, "waking up chip from elp");
+
+ /*
+ * The spinlock is required here to synchronize both the work and
+ * the completion variable in one entity.
+ */
+ spin_lock_irqsave(&wl->wl_lock, flags);
+ if (test_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags))
+ pending = true;
+ else
+ wl->elp_compl = &compl;
+ spin_unlock_irqrestore(&wl->wl_lock, flags);
+
+ ret = wlcore_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG, ELPCTRL_WAKE_UP);
+ if (ret < 0) {
+ wl12xx_queue_recovery_work(wl);
+ goto err;
+ }
+
+ if (!pending) {
+ ret = wait_for_completion_timeout(
+ &compl, msecs_to_jiffies(WL1271_WAKEUP_TIMEOUT));
+ if (ret == 0) {
+ wl1271_error("ELP wakeup timeout!");
+ wl12xx_queue_recovery_work(wl);
+ ret = -ETIMEDOUT;
+ goto err;
+ }
+ }
+
+ clear_bit(WL1271_FLAG_IN_ELP, &wl->flags);
+
+ wl1271_debug(DEBUG_PSM, "wakeup time: %u ms",
+ jiffies_to_msecs(jiffies - start_time));
+ goto out;
+
+err:
+ spin_lock_irqsave(&wl->wl_lock, flags);
+ wl->elp_compl = NULL;
+ spin_unlock_irqrestore(&wl->wl_lock, flags);
+ return ret;
+
+out:
+ return 0;
+}
+EXPORT_SYMBOL_GPL(wl1271_ps_elp_wakeup);
+
+int wl1271_ps_set_mode(struct wl1271 *wl, struct wl12xx_vif *wlvif,
+ enum wl1271_cmd_ps_mode mode)
+{
+ int ret;
+ u16 timeout = wl->conf.conn.dynamic_ps_timeout;
+
+ switch (mode) {
+ case STATION_AUTO_PS_MODE:
+ case STATION_POWER_SAVE_MODE:
+ wl1271_debug(DEBUG_PSM, "entering psm (mode=%d,timeout=%u)",
+ mode, timeout);
+
+ ret = wl1271_acx_wake_up_conditions(wl, wlvif,
+ wl->conf.conn.wake_up_event,
+ wl->conf.conn.listen_interval);
+ if (ret < 0) {
+ wl1271_error("couldn't set wake up conditions");
+ return ret;
+ }
+
+ ret = wl1271_cmd_ps_mode(wl, wlvif, mode, timeout);
+ if (ret < 0)
+ return ret;
+
+ set_bit(WLVIF_FLAG_IN_PS, &wlvif->flags);
+
+ /*
+ * enable beacon early termination.
+ * Not relevant for 5GHz and for high rates.
+ */
+ if ((wlvif->band == IEEE80211_BAND_2GHZ) &&
+ (wlvif->basic_rate < CONF_HW_BIT_RATE_9MBPS)) {
+ ret = wl1271_acx_bet_enable(wl, wlvif, true);
+ if (ret < 0)
+ return ret;
+ }
+ break;
+ case STATION_ACTIVE_MODE:
+ wl1271_debug(DEBUG_PSM, "leaving psm");
+
+ /* disable beacon early termination */
+ if ((wlvif->band == IEEE80211_BAND_2GHZ) &&
+ (wlvif->basic_rate < CONF_HW_BIT_RATE_9MBPS)) {
+ ret = wl1271_acx_bet_enable(wl, wlvif, false);
+ if (ret < 0)
+ return ret;
+ }
+
+ ret = wl1271_cmd_ps_mode(wl, wlvif, mode, 0);
+ if (ret < 0)
+ return ret;
+
+ clear_bit(WLVIF_FLAG_IN_PS, &wlvif->flags);
+ break;
+ default:
+ wl1271_warning("trying to set ps to unsupported mode %d", mode);
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static void wl1271_ps_filter_frames(struct wl1271 *wl, u8 hlid)
+{
+ int i;
+ struct sk_buff *skb;
+ struct ieee80211_tx_info *info;
+ unsigned long flags;
+ int filtered[NUM_TX_QUEUES];
+ struct wl1271_link *lnk = &wl->links[hlid];
+
+ /* filter all frames currently in the low level queues for this hlid */
+ for (i = 0; i < NUM_TX_QUEUES; i++) {
+ filtered[i] = 0;
+ while ((skb = skb_dequeue(&lnk->tx_queue[i]))) {
+ filtered[i]++;
+
+ if (WARN_ON(wl12xx_is_dummy_packet(wl, skb)))
+ continue;
+
+ info = IEEE80211_SKB_CB(skb);
+ info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
+ info->status.rates[0].idx = -1;
+ ieee80211_tx_status_ni(wl->hw, skb);
+ }
+ }
+
+ spin_lock_irqsave(&wl->wl_lock, flags);
+ for (i = 0; i < NUM_TX_QUEUES; i++) {
+ wl->tx_queue_count[i] -= filtered[i];
+ if (lnk->wlvif)
+ lnk->wlvif->tx_queue_count[i] -= filtered[i];
+ }
+ spin_unlock_irqrestore(&wl->wl_lock, flags);
+
+ wl1271_handle_tx_low_watermark(wl);
+}
+
+void wl12xx_ps_link_start(struct wl1271 *wl, struct wl12xx_vif *wlvif,
+ u8 hlid, bool clean_queues)
+{
+ struct ieee80211_sta *sta;
+ struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
+
+ if (WARN_ON_ONCE(wlvif->bss_type != BSS_TYPE_AP_BSS))
+ return;
+
+ if (!test_bit(hlid, wlvif->ap.sta_hlid_map) ||
+ test_bit(hlid, &wl->ap_ps_map))
+ return;
+
+ wl1271_debug(DEBUG_PSM, "start mac80211 PSM on hlid %d pkts %d "
+ "clean_queues %d", hlid, wl->links[hlid].allocated_pkts,
+ clean_queues);
+
+ rcu_read_lock();
+ sta = ieee80211_find_sta(vif, wl->links[hlid].addr);
+ if (!sta) {
+ wl1271_error("could not find sta %pM for starting ps",
+ wl->links[hlid].addr);
+ rcu_read_unlock();
+ return;
+ }
+
+ ieee80211_sta_ps_transition_ni(sta, true);
+ rcu_read_unlock();
+
+ /* do we want to filter all frames from this link's queues? */
+ if (clean_queues)
+ wl1271_ps_filter_frames(wl, hlid);
+
+ __set_bit(hlid, &wl->ap_ps_map);
+}
+
+void wl12xx_ps_link_end(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 hlid)
+{
+ struct ieee80211_sta *sta;
+ struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
+
+ if (!test_bit(hlid, &wl->ap_ps_map))
+ return;
+
+ wl1271_debug(DEBUG_PSM, "end mac80211 PSM on hlid %d", hlid);
+
+ __clear_bit(hlid, &wl->ap_ps_map);
+
+ rcu_read_lock();
+ sta = ieee80211_find_sta(vif, wl->links[hlid].addr);
+ if (!sta) {
+ wl1271_error("could not find sta %pM for ending ps",
+ wl->links[hlid].addr);
+ goto end;
+ }
+
+ ieee80211_sta_ps_transition_ni(sta, false);
+end:
+ rcu_read_unlock();
+}
Code Review / kvmfornfv.git / blobdiff