drivers/net/wireless/iwlegacy/iwl-4965-eeprom.c

   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  */
  90 int 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
 116 void 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
 123 int 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;
 140 err:
 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
 149 void 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 }