1/******************************************************************************
  2 *
  3 * This file is provided under a dual BSD/GPLv2 license.  When using or
  4 * redistributing this file, you may do so under either license.
  5 *
  6 * GPL LICENSE SUMMARY
  7 *
  8 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
  9 *
 10 * This program is free software; you can redistribute it and/or modify
 11 * it under the terms of version 2 of the GNU General Public License as
 12 * published by the Free Software Foundation.
 13 *
 14 * This program is distributed in the hope that it will be useful, but
 15 * WITHOUT ANY WARRANTY; without even the implied warranty of
 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 17 * General Public License for more details.
 18 *
 19 * You should have received a copy of the GNU General Public License
 20 * along with this program; if not, write to the Free Software
 21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
 22 * USA
 23 *
 24 * The full GNU General Public License is included in this distribution
 25 * in the file called LICENSE.GPL.
 26 *
 27 * Contact Information:
 28 *  Intel Linux Wireless <ilw@linux.intel.com>
 29 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 30 *
 31 * BSD LICENSE
 32 *
 33 * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.
 34 * All rights reserved.
 35 *
 36 * Redistribution and use in source and binary forms, with or without
 37 * modification, are permitted provided that the following conditions
 38 * are met:
 39 *
 40 *  * Redistributions of source code must retain the above copyright
 41 *    notice, this list of conditions and the following disclaimer.
 42 *  * Redistributions in binary form must reproduce the above copyright
 43 *    notice, this list of conditions and the following disclaimer in
 44 *    the documentation and/or other materials provided with the
 45 *    distribution.
 46 *  * Neither the name Intel Corporation nor the names of its
 47 *    contributors may be used to endorse or promote products derived
 48 *    from this software without specific prior written permission.
 49 *
 50 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 51 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 52 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 53 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 54 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 55 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 56 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 57 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 58 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 59 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 60 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 61 *****************************************************************************/
 62
 63
 64#include <linux/kernel.h>
 65#include <linux/module.h>
 66#include <linux/slab.h>
 67#include <linux/init.h>
 68
 69#include <net/mac80211.h>
 70
 71#include "iwl-commands.h"
 72#include "iwl-dev.h"
 73#include "iwl-core.h"
 74#include "iwl-debug.h"
 75#include "iwl-4965.h"
 76#include "iwl-io.h"
 77
 78/******************************************************************************
 79 *
 80 * EEPROM related functions
 81 *
 82******************************************************************************/
 83
 84/*
 85 * The device's EEPROM semaphore prevents conflicts between driver and uCode
 86 * when accessing the EEPROM; each access is a series of pulses to/from the
 87 * EEPROM chip, not a single event, so even reads could conflict if they
 88 * weren't arbitrated by the semaphore.
 89 */
 90int iwl4965_eeprom_acquire_semaphore(struct iwl_priv *priv)
 91{
 92	u16 count;
 93	int ret;
 94
 95	for (count = 0; count < EEPROM_SEM_RETRY_LIMIT; count++) {
 96		/* Request semaphore */
 97		iwl_legacy_set_bit(priv, CSR_HW_IF_CONFIG_REG,
 98			    CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);
 99
100		/* See if we got it */
101		ret = iwl_poll_bit(priv, CSR_HW_IF_CONFIG_REG,
102				CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM,
103				CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM,
104				EEPROM_SEM_TIMEOUT);
105		if (ret >= 0) {
106			IWL_DEBUG_IO(priv,
107				"Acquired semaphore after %d tries.\n",
108				count+1);
109			return ret;
110		}
111	}
112
113	return ret;
114}
115
116void iwl4965_eeprom_release_semaphore(struct iwl_priv *priv)
117{
118	iwl_legacy_clear_bit(priv, CSR_HW_IF_CONFIG_REG,
119		CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);
120
121}
122
123int iwl4965_eeprom_check_version(struct iwl_priv *priv)
124{
125	u16 eeprom_ver;
126	u16 calib_ver;
127
128	eeprom_ver = iwl_legacy_eeprom_query16(priv, EEPROM_VERSION);
129	calib_ver = iwl_legacy_eeprom_query16(priv,
130			EEPROM_4965_CALIB_VERSION_OFFSET);
131
132	if (eeprom_ver < priv->cfg->eeprom_ver ||
133	    calib_ver < priv->cfg->eeprom_calib_ver)
134		goto err;
135
136	IWL_INFO(priv, "device EEPROM VER=0x%x, CALIB=0x%x\n",
137		 eeprom_ver, calib_ver);
138
139	return 0;
140err:
141	IWL_ERR(priv, "Unsupported (too old) EEPROM VER=0x%x < 0x%x "
142		  "CALIB=0x%x < 0x%x\n",
143		  eeprom_ver, priv->cfg->eeprom_ver,
144		  calib_ver,  priv->cfg->eeprom_calib_ver);
145	return -EINVAL;
146
147}
148
149void iwl4965_eeprom_get_mac(const struct iwl_priv *priv, u8 *mac)
150{
151	const u8 *addr = iwl_legacy_eeprom_query_addr(priv,
152					EEPROM_MAC_ADDRESS);
153	memcpy(mac, addr, ETH_ALEN);
154}