Merge branch 'master' into tk71

[mv-sheeva.git] / drivers / net / wireless / wl1251 / ps.c

diff --git a/drivers/net/wireless/wl1251/ps.c b/drivers/net/wireless/wl1251/ps.c
new file mode 100644 (file)
index 0000000..5ed47c8
--- /dev/null
+++ b/drivers/net/wireless/wl1251/ps.c
@@ -0,0 +1,194 @@
+/*
+ * This file is part of wl1251
+ *
+ * Copyright (C) 2008 Nokia Corporation
+ *
+ * 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 "cmd.h"
+#include "io.h"
+
+/* in ms */
+#define WL1251_WAKEUP_TIMEOUT 100
+
+void wl1251_elp_work(struct work_struct *work)
+{
+       struct delayed_work *dwork;
+       struct wl1251 *wl;
+
+       dwork = container_of(work, struct delayed_work, work);
+       wl = container_of(dwork, struct wl1251, elp_work);
+
+       wl1251_debug(DEBUG_PSM, "elp work");
+
+       mutex_lock(&wl->mutex);
+
+       if (wl->elp || !wl->psm)
+               goto out;
+
+       wl1251_debug(DEBUG_PSM, "chip to elp");
+       wl1251_write_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
+       wl->elp = true;
+
+out:
+       mutex_unlock(&wl->mutex);
+}
+
+#define ELP_ENTRY_DELAY  5
+
+/* Routines to toggle sleep mode while in ELP */
+void wl1251_ps_elp_sleep(struct wl1251 *wl)
+{
+       unsigned long delay;
+
+       if (wl->psm) {
+               cancel_delayed_work(&wl->elp_work);
+               delay = msecs_to_jiffies(ELP_ENTRY_DELAY);
+               ieee80211_queue_delayed_work(wl->hw, &wl->elp_work, delay);
+       }
+}
+
+int wl1251_ps_elp_wakeup(struct wl1251 *wl)
+{
+       unsigned long timeout, start;
+       u32 elp_reg;
+
+       if (!wl->elp)
+               return 0;
+
+       wl1251_debug(DEBUG_PSM, "waking up chip from elp");
+
+       start = jiffies;
+       timeout = jiffies + msecs_to_jiffies(WL1251_WAKEUP_TIMEOUT);
+
+       wl1251_write_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
+
+       elp_reg = wl1251_read_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
+
+       /*
+        * FIXME: we should wait for irq from chip but, as a temporary
+        * solution to simplify locking, let's poll instead
+        */
+       while (!(elp_reg & ELPCTRL_WLAN_READY)) {
+               if (time_after(jiffies, timeout)) {
+                       wl1251_error("elp wakeup timeout");
+                       return -ETIMEDOUT;
+               }
+               msleep(1);
+               elp_reg = wl1251_read_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
+       }
+
+       wl1251_debug(DEBUG_PSM, "wakeup time: %u ms",
+                    jiffies_to_msecs(jiffies - start));
+
+       wl->elp = false;
+
+       return 0;
+}
+
+static int wl1251_ps_set_elp(struct wl1251 *wl, bool enable)
+{
+       int ret;
+
+       if (enable) {
+               wl1251_debug(DEBUG_PSM, "sleep auth psm/elp");
+
+               ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_ELP);
+               if (ret < 0)
+                       return ret;
+
+               wl1251_ps_elp_sleep(wl);
+       } else {
+               wl1251_debug(DEBUG_PSM, "sleep auth cam");
+
+               /*
+                * When the target is in ELP, we can only
+                * access the ELP control register. Thus,
+                * we have to wake the target up before
+                * changing the power authorization.
+                */
+
+               wl1251_ps_elp_wakeup(wl);
+
+               ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_CAM);
+               if (ret < 0)
+                       return ret;
+       }
+
+       return 0;
+}
+
+int wl1251_ps_set_mode(struct wl1251 *wl, enum wl1251_cmd_ps_mode mode)
+{
+       int ret;
+
+       switch (mode) {
+       case STATION_POWER_SAVE_MODE:
+               wl1251_debug(DEBUG_PSM, "entering psm");
+
+               /* enable beacon filtering */
+               ret = wl1251_acx_beacon_filter_opt(wl, true);
+               if (ret < 0)
+                       return ret;
+
+               ret = wl1251_acx_wake_up_conditions(wl,
+                                                   WAKE_UP_EVENT_DTIM_BITMAP,
+                                                   wl->listen_int);
+               if (ret < 0)
+                       return ret;
+
+               ret = wl1251_cmd_ps_mode(wl, STATION_POWER_SAVE_MODE);
+               if (ret < 0)
+                       return ret;
+
+               ret = wl1251_ps_set_elp(wl, true);
+               if (ret < 0)
+                       return ret;
+
+               wl->psm = 1;
+               break;
+       case STATION_ACTIVE_MODE:
+       default:
+               wl1251_debug(DEBUG_PSM, "leaving psm");
+               ret = wl1251_ps_set_elp(wl, false);
+               if (ret < 0)
+                       return ret;
+
+               /* disable beacon filtering */
+               ret = wl1251_acx_beacon_filter_opt(wl, false);
+               if (ret < 0)
+                       return ret;
+
+               ret = wl1251_acx_wake_up_conditions(wl,
+                                                   WAKE_UP_EVENT_DTIM_BITMAP,
+                                                   wl->listen_int);
+               if (ret < 0)
+                       return ret;
+
+               ret = wl1251_cmd_ps_mode(wl, STATION_ACTIVE_MODE);
+               if (ret < 0)
+                       return ret;
+
+               wl->psm = 0;
+               break;
+       }
+
+       return ret;
+}
+