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                 struct cfg80211_scan_info info = {
  40                         .aborted = false,
  41                 };
  42
  43                 ieee80211_scan_completed(wl->hw, &info);
  44                 wl1251_debug(DEBUG_MAC80211, "mac80211 hw scan completed");
  45                 wl->scanning = false;
  46                 if (wl->hw->conf.flags & IEEE80211_CONF_IDLE)
  47                         ret = wl1251_ps_set_mode(wl, STATION_IDLE);
  48         }
  49
  50         return ret;
  51 }
  52
  53 #define WL1251_PSM_ENTRY_RETRIES  3
  54 static int wl1251_event_ps_report(struct wl1251 *wl,
  55                                   struct event_mailbox *mbox)
  56 {
  57         int ret = 0;
  58
  59         wl1251_debug(DEBUG_EVENT, "ps status: %x", mbox->ps_status);
  60
  61         switch (mbox->ps_status) {
  62         case EVENT_ENTER_POWER_SAVE_FAIL:
  63                 wl1251_debug(DEBUG_PSM, "PSM entry failed");
  64
  65                 if (wl->station_mode != STATION_POWER_SAVE_MODE) {
  66                         /* remain in active mode */
  67                         wl->psm_entry_retry = 0;
  68                         break;
  69                 }
  70
  71                 if (wl->psm_entry_retry < WL1251_PSM_ENTRY_RETRIES) {
  72                         wl->psm_entry_retry++;
  73                         ret = wl1251_ps_set_mode(wl, STATION_POWER_SAVE_MODE);
  74                 } else {
  75                         wl1251_error("Power save entry failed, giving up");
  76                         wl->psm_entry_retry = 0;
  77                 }
  78                 break;
  79         case EVENT_ENTER_POWER_SAVE_SUCCESS:
  80         case EVENT_EXIT_POWER_SAVE_FAIL:
  81         case EVENT_EXIT_POWER_SAVE_SUCCESS:
  82         default:
  83                 wl->psm_entry_retry = 0;
  84                 break;
  85         }
  86
  87         return 0;
  88 }
  89
  90 static void wl1251_event_mbox_dump(struct event_mailbox *mbox)
  91 {
  92         wl1251_debug(DEBUG_EVENT, "MBOX DUMP:");
  93         wl1251_debug(DEBUG_EVENT, "\tvector: 0x%x", mbox->events_vector);
  94         wl1251_debug(DEBUG_EVENT, "\tmask: 0x%x", mbox->events_mask);
  95 }
  96
  97 static int wl1251_event_process(struct wl1251 *wl, struct event_mailbox *mbox)
  98 {
  99         int ret;
 100         u32 vector;
 101
 102         wl1251_event_mbox_dump(mbox);
 103
 104         vector = mbox->events_vector & ~(mbox->events_mask);
 105         wl1251_debug(DEBUG_EVENT, "vector: 0x%x", vector);
 106
 107         if (vector & SCAN_COMPLETE_EVENT_ID) {
 108                 ret = wl1251_event_scan_complete(wl, mbox);
 109                 if (ret < 0)
 110                         return ret;
 111         }
 112
 113         if (vector & BSS_LOSE_EVENT_ID) {
 114                 wl1251_debug(DEBUG_EVENT, "BSS_LOSE_EVENT");
 115
 116                 if (wl->psm_requested &&
 117                     wl->station_mode != STATION_ACTIVE_MODE) {
 118                         ret = wl1251_ps_set_mode(wl, STATION_ACTIVE_MODE);
 119                         if (ret < 0)
 120                                 return ret;
 121                 }
 122         }
 123
 124         if (vector & PS_REPORT_EVENT_ID) {
 125                 wl1251_debug(DEBUG_EVENT, "PS_REPORT_EVENT");
 126                 ret = wl1251_event_ps_report(wl, mbox);
 127                 if (ret < 0)
 128                         return ret;
 129         }
 130
 131         if (vector & SYNCHRONIZATION_TIMEOUT_EVENT_ID) {
 132                 wl1251_debug(DEBUG_EVENT, "SYNCHRONIZATION_TIMEOUT_EVENT");
 133
 134                 /* indicate to the stack, that beacons have been lost */
 135                 if (wl->vif && wl->vif->type == NL80211_IFTYPE_STATION)
 136                         ieee80211_beacon_loss(wl->vif);
 137         }
 138
 139         if (vector & REGAINED_BSS_EVENT_ID) {
 140                 if (wl->psm_requested) {
 141                         ret = wl1251_ps_set_mode(wl, STATION_POWER_SAVE_MODE);
 142                         if (ret < 0)
 143                                 return ret;
 144                 }
 145         }
 146
 147         if (wl->vif && wl->rssi_thold) {
 148                 if (vector & ROAMING_TRIGGER_LOW_RSSI_EVENT_ID) {
 149                         wl1251_debug(DEBUG_EVENT,
 150                                      "ROAMING_TRIGGER_LOW_RSSI_EVENT");
 151                         ieee80211_cqm_rssi_notify(wl->vif,
 152                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
 153                                 0, GFP_KERNEL);
 154                 }
 155
 156                 if (vector & ROAMING_TRIGGER_REGAINED_RSSI_EVENT_ID) {
 157                         wl1251_debug(DEBUG_EVENT,
 158                                      "ROAMING_TRIGGER_REGAINED_RSSI_EVENT");
 159                         ieee80211_cqm_rssi_notify(wl->vif,
 160                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
 161                                 0, GFP_KERNEL);
 162                 }
 163         }
 164
 165         return 0;
 166 }
 167
 168 /*
 169  * Poll the mailbox event field until any of the bits in the mask is set or a
 170  * timeout occurs (WL1251_EVENT_TIMEOUT in msecs)
 171  */
 172 int wl1251_event_wait(struct wl1251 *wl, u32 mask, int timeout_ms)
 173 {
 174         u32 events_vector, event;
 175         unsigned long timeout;
 176
 177         timeout = jiffies + msecs_to_jiffies(timeout_ms);
 178
 179         do {
 180                 if (time_after(jiffies, timeout))
 181                         return -ETIMEDOUT;
 182
 183                 msleep(1);
 184
 185                 /* read from both event fields */
 186                 wl1251_mem_read(wl, wl->mbox_ptr[0], &events_vector,
 187                                 sizeof(events_vector));
 188                 event = events_vector & mask;
 189                 wl1251_mem_read(wl, wl->mbox_ptr[1], &events_vector,
 190                                 sizeof(events_vector));
 191                 event |= events_vector & mask;
 192         } while (!event);
 193
 194         return 0;
 195 }
 196
 197 int wl1251_event_unmask(struct wl1251 *wl)
 198 {
 199         int ret;
 200
 201         ret = wl1251_acx_event_mbox_mask(wl, ~(wl->event_mask));
 202         if (ret < 0)
 203                 return ret;
 204
 205         return 0;
 206 }
 207
 208 void wl1251_event_mbox_config(struct wl1251 *wl)
 209 {
 210         wl->mbox_ptr[0] = wl1251_reg_read32(wl, REG_EVENT_MAILBOX_PTR);
 211         wl->mbox_ptr[1] = wl->mbox_ptr[0] + sizeof(struct event_mailbox);
 212
 213         wl1251_debug(DEBUG_EVENT, "MBOX ptrs: 0x%x 0x%x",
 214                      wl->mbox_ptr[0], wl->mbox_ptr[1]);
 215 }
 216
 217 int wl1251_event_handle(struct wl1251 *wl, u8 mbox_num)
 218 {
 219         struct event_mailbox mbox;
 220         int ret;
 221
 222         wl1251_debug(DEBUG_EVENT, "EVENT on mbox %d", mbox_num);
 223
 224         if (mbox_num > 1)
 225                 return -EINVAL;
 226
 227         /* first we read the mbox descriptor */
 228         wl1251_mem_read(wl, wl->mbox_ptr[mbox_num], &mbox,
 229                             sizeof(struct event_mailbox));
 230
 231         /* process the descriptor */
 232         ret = wl1251_event_process(wl, &mbox);
 233         if (ret < 0)
 234                 return ret;
 235
 236         /* then we let the firmware know it can go on...*/
 237         wl1251_reg_write32(wl, ACX_REG_INTERRUPT_TRIG, INTR_TRIG_EVENT_ACK);
 238
 239         return 0;
 240 }