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         int ret = 0;
  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                 ieee80211_scan_completed(wl->hw, false);
  40                 wl1251_debug(DEBUG_MAC80211, "mac80211 hw scan completed");
  41                 wl->scanning = false;
  42                 if (wl->hw->conf.flags & IEEE80211_CONF_IDLE)
  43                         ret = wl1251_ps_set_mode(wl, STATION_IDLE);
  44         }
  45
  46         return ret;
  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                 wl1251_debug(DEBUG_EVENT, "SYNCHRONIZATION_TIMEOUT_EVENT");
  85
  86                 /* indicate to the stack, that beacons have been lost */
  87                 ieee80211_beacon_loss(wl->vif);
  88         }
  89
  90         if (vector & REGAINED_BSS_EVENT_ID) {
  91                 if (wl->psm_requested) {
  92                         ret = wl1251_ps_set_mode(wl, STATION_POWER_SAVE_MODE);
  93                         if (ret < 0)
  94                                 return ret;
  95                 }
  96         }
  97
  98         if (wl->vif && wl->rssi_thold) {
  99                 if (vector & ROAMING_TRIGGER_LOW_RSSI_EVENT_ID) {
 100                         wl1251_debug(DEBUG_EVENT,
 101                                      "ROAMING_TRIGGER_LOW_RSSI_EVENT");
 102                         ieee80211_cqm_rssi_notify(wl->vif,
 103                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
 104                                 GFP_KERNEL);
 105                 }
 106
 107                 if (vector & ROAMING_TRIGGER_REGAINED_RSSI_EVENT_ID) {
 108                         wl1251_debug(DEBUG_EVENT,
 109                                      "ROAMING_TRIGGER_REGAINED_RSSI_EVENT");
 110                         ieee80211_cqm_rssi_notify(wl->vif,
 111                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
 112                                 GFP_KERNEL);
 113                 }
 114         }
 115
 116         return 0;
 117 }
 118
 119 /*
 120  * Poll the mailbox event field until any of the bits in the mask is set or a
 121  * timeout occurs (WL1251_EVENT_TIMEOUT in msecs)
 122  */
 123 int wl1251_event_wait(struct wl1251 *wl, u32 mask, int timeout_ms)
 124 {
 125         u32 events_vector, event;
 126         unsigned long timeout;
 127
 128         timeout = jiffies + msecs_to_jiffies(timeout_ms);
 129
 130         do {
 131                 if (time_after(jiffies, timeout))
 132                         return -ETIMEDOUT;
 133
 134                 msleep(1);
 135
 136                 /* read from both event fields */
 137                 wl1251_mem_read(wl, wl->mbox_ptr[0], &events_vector,
 138                                 sizeof(events_vector));
 139                 event = events_vector & mask;
 140                 wl1251_mem_read(wl, wl->mbox_ptr[1], &events_vector,
 141                                 sizeof(events_vector));
 142                 event |= events_vector & mask;
 143         } while (!event);
 144
 145         return 0;
 146 }
 147
 148 int wl1251_event_unmask(struct wl1251 *wl)
 149 {
 150         int ret;
 151
 152         ret = wl1251_acx_event_mbox_mask(wl, ~(wl->event_mask));
 153         if (ret < 0)
 154                 return ret;
 155
 156         return 0;
 157 }
 158
 159 void wl1251_event_mbox_config(struct wl1251 *wl)
 160 {
 161         wl->mbox_ptr[0] = wl1251_reg_read32(wl, REG_EVENT_MAILBOX_PTR);
 162         wl->mbox_ptr[1] = wl->mbox_ptr[0] + sizeof(struct event_mailbox);
 163
 164         wl1251_debug(DEBUG_EVENT, "MBOX ptrs: 0x%x 0x%x",
 165                      wl->mbox_ptr[0], wl->mbox_ptr[1]);
 166 }
 167
 168 int wl1251_event_handle(struct wl1251 *wl, u8 mbox_num)
 169 {
 170         struct event_mailbox mbox;
 171         int ret;
 172
 173         wl1251_debug(DEBUG_EVENT, "EVENT on mbox %d", mbox_num);
 174
 175         if (mbox_num > 1)
 176                 return -EINVAL;
 177
 178         /* first we read the mbox descriptor */
 179         wl1251_mem_read(wl, wl->mbox_ptr[mbox_num], &mbox,
 180                             sizeof(struct event_mailbox));
 181
 182         /* process the descriptor */
 183         ret = wl1251_event_process(wl, &mbox);
 184         if (ret < 0)
 185                 return ret;
 186
 187         /* then we let the firmware know it can go on...*/
 188         wl1251_reg_write32(wl, ACX_REG_INTERRUPT_TRIG, INTR_TRIG_EVENT_ACK);
 189
 190         return 0;
 191 }