drivers/net/wireless/ti/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  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * version 2 as published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  19  * 02110-1301 USA
  20  *
  21  */
  22
  23 #include "wl1251.h"
  24 #include "reg.h"
  25 #include "io.h"
  26 #include "event.h"
  27 #include "ps.h"
  28
  29 static int wl1251_event_scan_complete(struct wl1251 *wl,
  30                                       struct event_mailbox *mbox)
  31 {
  32         wl1251_debug(DEBUG_EVENT, "status: 0x%x, channels: %d",
  33                      mbox->scheduled_scan_status,
  34                      mbox->scheduled_scan_channels);
  35
  36         if (wl->scanning) {
  37                 ieee80211_scan_completed(wl->hw, false);
  38                 wl1251_debug(DEBUG_MAC80211, "mac80211 hw scan completed");
  39                 wl->scanning = false;
  40         }
  41
  42         return 0;
  43 }
  44
  45 static void wl1251_event_mbox_dump(struct event_mailbox *mbox)
  46 {
  47         wl1251_debug(DEBUG_EVENT, "MBOX DUMP:");
  48         wl1251_debug(DEBUG_EVENT, "\tvector: 0x%x", mbox->events_vector);
  49         wl1251_debug(DEBUG_EVENT, "\tmask: 0x%x", mbox->events_mask);
  50 }
  51
  52 static int wl1251_event_process(struct wl1251 *wl, struct event_mailbox *mbox)
  53 {
  54         int ret;
  55         u32 vector;
  56
  57         wl1251_event_mbox_dump(mbox);
  58
  59         vector = mbox->events_vector & ~(mbox->events_mask);
  60         wl1251_debug(DEBUG_EVENT, "vector: 0x%x", vector);
  61
  62         if (vector & SCAN_COMPLETE_EVENT_ID) {
  63                 ret = wl1251_event_scan_complete(wl, mbox);
  64                 if (ret < 0)
  65                         return ret;
  66         }
  67
  68         if (vector & BSS_LOSE_EVENT_ID) {
  69                 wl1251_debug(DEBUG_EVENT, "BSS_LOSE_EVENT");
  70
  71                 if (wl->psm_requested &&
  72                     wl->station_mode != STATION_ACTIVE_MODE) {
  73                         ret = wl1251_ps_set_mode(wl, STATION_ACTIVE_MODE);
  74                         if (ret < 0)
  75                                 return ret;
  76                 }
  77         }
  78
  79         if (vector & SYNCHRONIZATION_TIMEOUT_EVENT_ID) {
  80                 wl1251_debug(DEBUG_EVENT, "SYNCHRONIZATION_TIMEOUT_EVENT");
  81
  82                 /* indicate to the stack, that beacons have been lost */
  83                 ieee80211_beacon_loss(wl->vif);
  84         }
  85
  86         if (vector & REGAINED_BSS_EVENT_ID) {
  87                 if (wl->psm_requested) {
  88                         ret = wl1251_ps_set_mode(wl, STATION_POWER_SAVE_MODE);
  89                         if (ret < 0)
  90                                 return ret;
  91                 }
  92         }
  93
  94         if (wl->vif && wl->rssi_thold) {
  95                 if (vector & ROAMING_TRIGGER_LOW_RSSI_EVENT_ID) {
  96                         wl1251_debug(DEBUG_EVENT,
  97                                      "ROAMING_TRIGGER_LOW_RSSI_EVENT");
  98                         ieee80211_cqm_rssi_notify(wl->vif,
  99                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
 100                                 GFP_KERNEL);
 101                 }
 102
 103                 if (vector & ROAMING_TRIGGER_REGAINED_RSSI_EVENT_ID) {
 104                         wl1251_debug(DEBUG_EVENT,
 105                                      "ROAMING_TRIGGER_REGAINED_RSSI_EVENT");
 106                         ieee80211_cqm_rssi_notify(wl->vif,
 107                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
 108                                 GFP_KERNEL);
 109                 }
 110         }
 111
 112         return 0;
 113 }
 114
 115 /*
 116  * Poll the mailbox event field until any of the bits in the mask is set or a
 117  * timeout occurs (WL1251_EVENT_TIMEOUT in msecs)
 118  */
 119 int wl1251_event_wait(struct wl1251 *wl, u32 mask, int timeout_ms)
 120 {
 121         u32 events_vector, event;
 122         unsigned long timeout;
 123
 124         timeout = jiffies + msecs_to_jiffies(timeout_ms);
 125
 126         do {
 127                 if (time_after(jiffies, timeout))
 128                         return -ETIMEDOUT;
 129
 130                 msleep(1);
 131
 132                 /* read from both event fields */
 133                 wl1251_mem_read(wl, wl->mbox_ptr[0], &events_vector,
 134                                 sizeof(events_vector));
 135                 event = events_vector & mask;
 136                 wl1251_mem_read(wl, wl->mbox_ptr[1], &events_vector,
 137                                 sizeof(events_vector));
 138                 event |= events_vector & mask;
 139         } while (!event);
 140
 141         return 0;
 142 }
 143
 144 int wl1251_event_unmask(struct wl1251 *wl)
 145 {
 146         int ret;
 147
 148         ret = wl1251_acx_event_mbox_mask(wl, ~(wl->event_mask));
 149         if (ret < 0)
 150                 return ret;
 151
 152         return 0;
 153 }
 154
 155 void wl1251_event_mbox_config(struct wl1251 *wl)
 156 {
 157         wl->mbox_ptr[0] = wl1251_reg_read32(wl, REG_EVENT_MAILBOX_PTR);
 158         wl->mbox_ptr[1] = wl->mbox_ptr[0] + sizeof(struct event_mailbox);
 159
 160         wl1251_debug(DEBUG_EVENT, "MBOX ptrs: 0x%x 0x%x",
 161                      wl->mbox_ptr[0], wl->mbox_ptr[1]);
 162 }
 163
 164 int wl1251_event_handle(struct wl1251 *wl, u8 mbox_num)
 165 {
 166         struct event_mailbox mbox;
 167         int ret;
 168
 169         wl1251_debug(DEBUG_EVENT, "EVENT on mbox %d", mbox_num);
 170
 171         if (mbox_num > 1)
 172                 return -EINVAL;
 173
 174         /* first we read the mbox descriptor */
 175         wl1251_mem_read(wl, wl->mbox_ptr[mbox_num], &mbox,
 176                             sizeof(struct event_mailbox));
 177
 178         /* process the descriptor */
 179         ret = wl1251_event_process(wl, &mbox);
 180         if (ret < 0)
 181                 return ret;
 182
 183         /* then we let the firmware know it can go on...*/
 184         wl1251_reg_write32(wl, ACX_REG_INTERRUPT_TRIG, INTR_TRIG_EVENT_ACK);
 185
 186         return 0;
 187 }