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
 29static 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
 50static 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
 86static 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
 93static 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 */
168int 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
193int 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
204void 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
213int 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}