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	wl1251_debug(DEBUG_EVENT, "status: 0x%x, channels: %d",
 33		     mbox->scheduled_scan_status,
 34		     mbox->scheduled_scan_channels);
 35
 36	if (wl->scanning) {
 37		ieee80211_scan_completed(wl->hw, false);
 38		wl1251_debug(DEBUG_MAC80211, "mac80211 hw scan completed");
 39		wl->scanning = false;
 40	}
 41
 42	return 0;
 43}
 44
 45static void wl1251_event_mbox_dump(struct event_mailbox *mbox)
 46{
 47	wl1251_debug(DEBUG_EVENT, "MBOX DUMP:");
 48	wl1251_debug(DEBUG_EVENT, "\tvector: 0x%x", mbox->events_vector);
 49	wl1251_debug(DEBUG_EVENT, "\tmask: 0x%x", mbox->events_mask);
 50}
 51
 52static int wl1251_event_process(struct wl1251 *wl, struct event_mailbox *mbox)
 53{
 54	int ret;
 55	u32 vector;
 56
 57	wl1251_event_mbox_dump(mbox);
 58
 59	vector = mbox->events_vector & ~(mbox->events_mask);
 60	wl1251_debug(DEBUG_EVENT, "vector: 0x%x", vector);
 61
 62	if (vector & SCAN_COMPLETE_EVENT_ID) {
 63		ret = wl1251_event_scan_complete(wl, mbox);
 64		if (ret < 0)
 65			return ret;
 66	}
 67
 68	if (vector & BSS_LOSE_EVENT_ID) {
 69		wl1251_debug(DEBUG_EVENT, "BSS_LOSE_EVENT");
 70
 71		if (wl->psm_requested &&
 72		    wl->station_mode != STATION_ACTIVE_MODE) {
 73			ret = wl1251_ps_set_mode(wl, STATION_ACTIVE_MODE);
 74			if (ret < 0)
 75				return ret;
 76		}
 77	}
 78
 79	if (vector & SYNCHRONIZATION_TIMEOUT_EVENT_ID &&
 80	    wl->station_mode != STATION_ACTIVE_MODE) {
 81		wl1251_debug(DEBUG_EVENT, "SYNCHRONIZATION_TIMEOUT_EVENT");
 82
 83		/* indicate to the stack, that beacons have been lost */
 84		ieee80211_beacon_loss(wl->vif);
 85	}
 86
 87	if (vector & REGAINED_BSS_EVENT_ID) {
 88		if (wl->psm_requested) {
 89			ret = wl1251_ps_set_mode(wl, STATION_POWER_SAVE_MODE);
 90			if (ret < 0)
 91				return ret;
 92		}
 93	}
 94
 95	if (wl->vif && wl->rssi_thold) {
 96		if (vector & ROAMING_TRIGGER_LOW_RSSI_EVENT_ID) {
 97			wl1251_debug(DEBUG_EVENT,
 98				     "ROAMING_TRIGGER_LOW_RSSI_EVENT");
 99			ieee80211_cqm_rssi_notify(wl->vif,
100				NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
101				GFP_KERNEL);
102		}
103
104		if (vector & ROAMING_TRIGGER_REGAINED_RSSI_EVENT_ID) {
105			wl1251_debug(DEBUG_EVENT,
106				     "ROAMING_TRIGGER_REGAINED_RSSI_EVENT");
107			ieee80211_cqm_rssi_notify(wl->vif,
108				NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
109				GFP_KERNEL);
110		}
111	}
112
113	return 0;
114}
115
116/*
117 * Poll the mailbox event field until any of the bits in the mask is set or a
118 * timeout occurs (WL1251_EVENT_TIMEOUT in msecs)
119 */
120int wl1251_event_wait(struct wl1251 *wl, u32 mask, int timeout_ms)
121{
122	u32 events_vector, event;
123	unsigned long timeout;
124
125	timeout = jiffies + msecs_to_jiffies(timeout_ms);
126
127	do {
128		if (time_after(jiffies, timeout))
129			return -ETIMEDOUT;
130
131		msleep(1);
132
133		/* read from both event fields */
134		wl1251_mem_read(wl, wl->mbox_ptr[0], &events_vector,
135				sizeof(events_vector));
136		event = events_vector & mask;
137		wl1251_mem_read(wl, wl->mbox_ptr[1], &events_vector,
138				sizeof(events_vector));
139		event |= events_vector & mask;
140	} while (!event);
141
142	return 0;
143}
144
145int wl1251_event_unmask(struct wl1251 *wl)
146{
147	int ret;
148
149	ret = wl1251_acx_event_mbox_mask(wl, ~(wl->event_mask));
150	if (ret < 0)
151		return ret;
152
153	return 0;
154}
155
156void wl1251_event_mbox_config(struct wl1251 *wl)
157{
158	wl->mbox_ptr[0] = wl1251_reg_read32(wl, REG_EVENT_MAILBOX_PTR);
159	wl->mbox_ptr[1] = wl->mbox_ptr[0] + sizeof(struct event_mailbox);
160
161	wl1251_debug(DEBUG_EVENT, "MBOX ptrs: 0x%x 0x%x",
162		     wl->mbox_ptr[0], wl->mbox_ptr[1]);
163}
164
165int wl1251_event_handle(struct wl1251 *wl, u8 mbox_num)
166{
167	struct event_mailbox mbox;
168	int ret;
169
170	wl1251_debug(DEBUG_EVENT, "EVENT on mbox %d", mbox_num);
171
172	if (mbox_num > 1)
173		return -EINVAL;
174
175	/* first we read the mbox descriptor */
176	wl1251_mem_read(wl, wl->mbox_ptr[mbox_num], &mbox,
177			    sizeof(struct event_mailbox));
178
179	/* process the descriptor */
180	ret = wl1251_event_process(wl, &mbox);
181	if (ret < 0)
182		return ret;
183
184	/* then we let the firmware know it can go on...*/
185	wl1251_reg_write32(wl, ACX_REG_INTERRUPT_TRIG, INTR_TRIG_EVENT_ACK);
186
187	return 0;
188}