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 }
241