drivers/net/wireless/wl12xx/wl1251_event.c

   1 /*
   2  * This file is part of wl1251
   3  *
   4  * Copyright (c) 1998-2007 Texas Instruments Incorporated
   5  * Copyright (C) 2008 Nokia Corporation
   6  *
   7  * Contact: Kalle Valo <kalle.valo@nokia.com>
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * version 2 as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  21  * 02110-1301 USA
  22  *
  23  */
  24
  25 #include "wl1251.h"
  26 #include "wl1251_reg.h"
  27 #include "wl1251_io.h"
  28 #include "wl1251_event.h"
  29 #include "wl1251_ps.h"
  30
  31 static int wl1251_event_scan_complete(struct wl1251 *wl,
  32                                       struct event_mailbox *mbox)
  33 {
  34         wl1251_debug(DEBUG_EVENT, "status: 0x%x, channels: %d",
  35                      mbox->scheduled_scan_status,
  36                      mbox->scheduled_scan_channels);
  37
  38         if (wl->scanning) {
  39                 mutex_unlock(&wl->mutex);
  40                 ieee80211_scan_completed(wl->hw, false);
  41                 mutex_lock(&wl->mutex);
  42                 wl1251_debug(DEBUG_MAC80211, "mac80211 hw scan completed");
  43                 wl->scanning = false;
  44         }
  45
  46         return 0;
  47 }
  48
  49 static void wl1251_event_mbox_dump(struct event_mailbox *mbox)
  50 {
  51         wl1251_debug(DEBUG_EVENT, "MBOX DUMP:");
  52         wl1251_debug(DEBUG_EVENT, "\tvector: 0x%x", mbox->events_vector);
  53         wl1251_debug(DEBUG_EVENT, "\tmask: 0x%x", mbox->events_mask);
  54 }
  55
  56 static int wl1251_event_process(struct wl1251 *wl, struct event_mailbox *mbox)
  57 {
  58         int ret;
  59         u32 vector;
  60
  61         wl1251_event_mbox_dump(mbox);
  62
  63         vector = mbox->events_vector & ~(mbox->events_mask);
  64         wl1251_debug(DEBUG_EVENT, "vector: 0x%x", vector);
  65
  66         if (vector & SCAN_COMPLETE_EVENT_ID) {
  67                 ret = wl1251_event_scan_complete(wl, mbox);
  68                 if (ret < 0)
  69                         return ret;
  70         }
  71
  72         if (vector & BSS_LOSE_EVENT_ID) {
  73                 wl1251_debug(DEBUG_EVENT, "BSS_LOSE_EVENT");
  74
  75                 if (wl->psm_requested &&
  76                     wl->station_mode != STATION_ACTIVE_MODE) {
  77                         ret = wl1251_ps_set_mode(wl, STATION_ACTIVE_MODE);
  78                         if (ret < 0)
  79                                 return ret;
  80                 }
  81         }
  82
  83         if (vector & SYNCHRONIZATION_TIMEOUT_EVENT_ID &&
  84             wl->station_mode != STATION_ACTIVE_MODE) {
  85                 wl1251_debug(DEBUG_EVENT, "SYNCHRONIZATION_TIMEOUT_EVENT");
  86                 /* need to unlock mutex to avoid deadlocking with rtnl */
  87                 mutex_unlock(&wl->mutex);
  88
  89                 /* indicate to the stack, that beacons have been lost */
  90                 ieee80211_beacon_loss(wl->vif);
  91                 mutex_lock(&wl->mutex);
  92         }
  93
  94         if (vector & REGAINED_BSS_EVENT_ID) {
  95                 if (wl->psm_requested) {
  96                         ret = wl1251_ps_set_mode(wl, STATION_POWER_SAVE_MODE);
  97                         if (ret < 0)
  98                                 return ret;
  99                 }
 100         }
 101
 102         /* log rare events to help debugging some issues */
 103         if (vector & ~(SCAN_COMPLETE_EVENT_ID | PS_REPORT_EVENT_ID |
 104                         SYNCHRONIZATION_TIMEOUT_EVENT_ID | JOIN_EVENT_COMPLETE_ID |
 105                         BSS_LOSE_EVENT_ID | RESET_BSS_EVENT_ID |
 106                         BT_PTA_PREDICTION_EVENT_ID))
 107                 wl1251_info("rare event: %08x", vector);
 108
 109         return 0;
 110 }
 111
 112 /*
 113  * Poll the mailbox event field until any of the bits in the mask is set or a
 114  * timeout occurs (WL1251_EVENT_TIMEOUT in msecs)
 115  */
 116 int wl1251_event_wait(struct wl1251 *wl, u32 mask, int timeout_ms)
 117 {
 118         u32 events_vector, event;
 119         unsigned long timeout;
 120
 121         timeout = jiffies + msecs_to_jiffies(timeout_ms);
 122
 123         do {
 124                 if (time_after(jiffies, timeout))
 125                         return -ETIMEDOUT;
 126
 127                 msleep(1);
 128
 129                 /* read from both event fields */
 130                 wl1251_mem_read(wl, wl->mbox_ptr[0], &events_vector,
 131                                 sizeof(events_vector));
 132                 event = events_vector & mask;
 133                 wl1251_mem_read(wl, wl->mbox_ptr[1], &events_vector,
 134                                 sizeof(events_vector));
 135                 event |= events_vector & mask;
 136         } while (!event);
 137
 138         return 0;
 139 }
 140
 141 int wl1251_event_unmask(struct wl1251 *wl)
 142 {
 143         int ret;
 144
 145         ret = wl1251_acx_event_mbox_mask(wl, ~(wl->event_mask));
 146         if (ret < 0)
 147                 return ret;
 148
 149         return 0;
 150 }
 151
 152 void wl1251_event_mbox_config(struct wl1251 *wl)
 153 {
 154         wl->mbox_ptr[0] = wl1251_reg_read32(wl, REG_EVENT_MAILBOX_PTR);
 155         wl->mbox_ptr[1] = wl->mbox_ptr[0] + sizeof(struct event_mailbox);
 156
 157         wl1251_debug(DEBUG_EVENT, "MBOX ptrs: 0x%x 0x%x",
 158                      wl->mbox_ptr[0], wl->mbox_ptr[1]);
 159 }
 160
 161 int wl1251_event_handle(struct wl1251 *wl, u8 mbox_num)
 162 {
 163         struct event_mailbox mbox;
 164         int ret;
 165
 166         wl1251_debug(DEBUG_EVENT, "EVENT on mbox %d", mbox_num);
 167
 168         if (mbox_num > 1)
 169                 return -EINVAL;
 170
 171         /* first we read the mbox descriptor */
 172         wl1251_mem_read(wl, wl->mbox_ptr[mbox_num], &mbox,
 173                             sizeof(struct event_mailbox));
 174
 175         /* process the descriptor */
 176         ret = wl1251_event_process(wl, &mbox);
 177         if (ret < 0)
 178                 return ret;
 179
 180         /* then we let the firmware know it can go on...*/
 181         wl1251_reg_write32(wl, ACX_REG_INTERRUPT_TRIG, INTR_TRIG_EVENT_ACK);
 182
 183         return 0;
 184 }