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