path: root/drivers/net/wireless/ath/carl9170/rx.c

/*
 * Atheros CARL9170 driver
 *
 * 802.11 & command trap routines
 *
 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
 * Copyright 2009, 2010, Christian Lamparter <chunkeey@googlemail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, see
 * http://www.gnu.org/licenses/.
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *    Copyright (c) 2007-2008 Atheros Communications, Inc.
 *
 *    Permission to use, copy, modify, and/or distribute this software for any
 *    purpose with or without fee is hereby granted, provided that the above
 *    copyright notice and this permission notice appear in all copies.
 *
 *    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 *    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 *    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 *    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 *    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 *    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 *    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/etherdevice.h>
#include <linux/crc32.h>
#include <net/mac80211.h>
#include "carl9170.h"
#include "hw.h"
#include "cmd.h"

static void carl9170_dbg_message(struct ar9170 *ar, const char *buf, u32 len)
{
	bool restart = false;
	enum carl9170_restart_reasons reason = CARL9170_RR_NO_REASON;

	if (len > 3) {
		if (memcmp(buf, CARL9170_ERR_MAGIC, 3) == 0) {
			ar->fw.err_counter++;
			if (ar->fw.err_counter > 3) {
				restart = true;
				reason = CARL9170_RR_TOO_MANY_FIRMWARE_ERRORS;
			}
		}

		if (memcmp(buf, CARL9170_BUG_MAGIC, 3) == 0) {
			ar->fw.bug_counter++;
			restart = true;
			reason = CARL9170_RR_FATAL_FIRMWARE_ERROR;
		}
	}

	wiphy_info(ar->hw->wiphy, "FW: %.*s\n", len, buf);

	if (restart)
		carl9170_restart(ar, reason);
}

static void carl9170_handle_ps(struct ar9170 *ar, struct carl9170_rsp *rsp)
{
	u32 ps;
	bool new_ps;

	ps = le32_to_cpu(rsp->psm.state);

	new_ps = (ps & CARL9170_PSM_COUNTER) != CARL9170_PSM_WAKE;
	if (ar->ps.state != new_ps) {
		if (!new_ps) {
			ar->ps.sleep_ms = jiffies_to_msecs(jiffies -
				ar->ps.last_action);
		}

		ar->ps.last_action = jiffies;

		ar->ps.state = new_ps;
	}
}

static int carl9170_check_sequence(struct ar9170 *ar, unsigned int seq)
{
	if (ar->cmd_seq < -1)
		return 0;

	/*
	 * Initialize Counter
	 */
	if (ar->cmd_seq < 0)
		ar->cmd_seq = seq;

	/*
	 * The sequence is strictly monotonic increasing and it never skips!
	 *
	 * Therefore we can safely assume that whenever we received an
	 * unexpected sequence we have lost some valuable data.
	 */
	if (seq != ar->cmd_seq) {
		int count;

		count = (seq - ar->cmd_seq) % ar->fw.cmd_bufs;

		wiphy_err(ar->hw->wiphy, "lost %d command responses/traps! "
			  "w:%d g:%d\n", count, ar->cmd_seq, seq);

		carl9170_restart(ar, CARL9170_RR_LOST_RSP);
		return -EIO;
	}

	ar->cmd_seq = (ar->cmd_seq + 1) % ar->fw.cmd_bufs;
	return 0;
}

static void carl9170_cmd_callback(struct ar9170 *ar, u32 len, void *buffer)
{
	/*
	 * Some commands may have a variable response length
	 * and we cannot predict the correct length in advance.
	 * So we only check if we provided enough space for the data.
	 */
	if (unlikely(ar->readlen != (len - 4))) {
		dev_warn(&ar->udev->dev, "received invalid command response:"
			 "got %d, instead of %d\n", len - 4, ar->readlen);
		print_hex_dump_bytes("carl9170 cmd:", DUMP_PREFIX_OFFSET,
			ar->cmd_buf, (ar->cmd.hdr.len + 4) & 0x3f);
		print_hex_dump_bytes("carl9170 rsp:", DUMP_PREFIX_OFFSET,
			buffer, len);
		/*
		 * Do not complete. The command times out,
		 * and we get a stack trace from there.
		 */
		carl9170_restart(ar, CARL9170_RR_INVALID_RSP);
	}

	spin_lock(&ar->cmd_lock);
	if (ar->readbuf)