1 files changed, 274 insertions, 0 deletions

diff --git a/drivers/net/wireless/wl12xx/ps.c b/drivers/net/wireless/wl12xx/ps.c
new file mode 100644
index 00000000000..3548377ab9c
--- /dev/null
+++ b/drivers/net/wireless/wl12xx/ps.c
@@ -0,0 +1,274 @@
+/*
+ * 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 "reg.h"
+#include "ps.h"
+#include "io.h"
+#include "tx.h"
+
+#define WL1271_WAKEUP_TIMEOUT 500
+
+void wl1271_elp_work(struct work_struct *work)
+{
+        struct delayed_work *dwork;
+        struct wl1271 *wl;
+
+        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 == WL1271_STATE_OFF))
+                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) ||
+            (!test_bit(WL1271_FLAG_PSM, &wl->flags) &&
+             !test_bit(WL1271_FLAG_IDLE, &wl->flags)))
+                goto out;
+
+        wl1271_debug(DEBUG_PSM, "chip to elp");
+        wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
+        set_bit(WL1271_FLAG_IN_ELP, &wl->flags);
+
+out:
+        mutex_unlock(&wl->mutex);
+}
+
+#define ELP_ENTRY_DELAY  5
+
+/* Routines to toggle sleep mode while in ELP */
+void wl1271_ps_elp_sleep(struct wl1271 *wl)
+{
+        /* we shouldn't get consecutive sleep requests */
+        if (WARN_ON(test_and_set_bit(WL1271_FLAG_ELP_REQUESTED, &wl->flags)))
+                return;
+
+        if (!test_bit(WL1271_FLAG_PSM, &wl->flags) &&
+            !test_bit(WL1271_FLAG_IDLE, &wl->flags))
+                return;
+
+        ieee80211_queue_delayed_work(wl->hw, &wl->elp_work,
+                                     msecs_to_jiffies(ELP_ENTRY_DELAY));
+}
+
+int wl1271_ps_elp_wakeup(struct wl1271 *wl)
+{
+        DECLARE_COMPLETION_ONSTACK(compl);
+        unsigned long flags;
+        int ret;
+        u32 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);
+
+        wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
+
+        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;
+                } else if (ret < 0) {
+                        wl1271_error("ELP wakeup completion error.");
+                        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;
+}
+
+int wl1271_ps_set_mode(struct wl1271 *wl, enum wl1271_cmd_ps_mode mode,
+                       u32 rates, bool send)
+{
+        int ret;
+
+        switch (mode) {
+        case STATION_POWER_SAVE_MODE:
+                wl1271_debug(DEBUG_PSM, "entering psm");
+
+                ret = wl1271_acx_wake_up_conditions(wl);
+                if (ret < 0) {
+                        wl1271_error("couldn't set wake up conditions");
+                        return ret;
+                }
+
+                ret = wl1271_cmd_ps_mode(wl, STATION_POWER_SAVE_MODE);
+                if (ret < 0)
+                        return ret;
+
+                set_bit(WL1271_FLAG_PSM, &wl->flags);
+                break;
+        case STATION_ACTIVE_MODE:
+        default:
+                wl1271_debug(DEBUG_PSM, "leaving psm");
+
+                /* disable beacon early termination */
+                if (wl->band == IEEE80211_BAND_2GHZ) {
+                        ret = wl1271_acx_bet_enable(wl, false);
+                        if (ret < 0)
+                                return ret;
+                }
+
+                /* disable beacon filtering */
+                ret = wl1271_acx_beacon_filter_opt(wl, false);
+                if (ret < 0)
+                        return ret;
+
+                ret = wl1271_cmd_ps_mode(wl, STATION_ACTIVE_MODE);
+                if (ret < 0)
+                        return ret;
+
+                clear_bit(WL1271_FLAG_PSM, &wl->flags);
+                break;
+        }
+
+        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];
+
+        /* filter all frames currently the low level queus for this hlid */
+        for (i = 0; i < NUM_TX_QUEUES; i++) {
+                filtered[i] = 0;
+                while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
+                        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);
+                        filtered[i]++;
+                }
+        }
+
+        spin_lock_irqsave(&wl->wl_lock, flags);
+        for (i = 0; i < NUM_TX_QUEUES; i++)
+                wl->tx_queue_count[i] -= filtered[i];
+        spin_unlock_irqrestore(&wl->wl_lock, flags);
+
+        wl1271_handle_tx_low_watermark(wl);
+}
+
+void wl1271_ps_link_start(struct wl1271 *wl, u8 hlid, bool clean_queues)
+{
+        struct ieee80211_sta *sta;
+
+        if (test_bit(hlid, &wl->ap_ps_map))
+                return;
+
+        wl1271_debug(DEBUG_PSM, "start mac80211 PSM on hlid %d blks %d "
+                     "clean_queues %d", hlid, wl->links[hlid].allocated_blks,
+                     clean_queues);
+
+        rcu_read_lock();
+        sta = ieee80211_find_sta(wl->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 wl1271_ps_link_end(struct wl1271 *wl, u8 hlid)
+{
+        struct ieee80211_sta *sta;
+
+        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(wl->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();
+}