drivers/net/wireless/iwlwifi/iwl-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 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  * Tomas Winkler <tomas.winkler@intel.com>
  29  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  30  *
  31  * BSD LICENSE
  32  *
  33  * Copyright(c) 2005 - 2008 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/version.h>
  67 #include <linux/init.h>
  68
  69 #include <net/mac80211.h>
  70
  71 #include "iwl-4965-commands.h"
  72 #include "iwl-4965.h"
  73 #include "iwl-core.h"
  74 #include "iwl-4965-debug.h"
  75 #include "iwl-eeprom.h"
  76 #include "iwl-4965-io.h"
  77
  78 /******************************************************************************
  79  *
  80  * EEPROM related functions
  81  *
  82 ******************************************************************************/
  83
  84 int iwlcore_eeprom_verify_signature(struct iwl4965_priv *priv)
  85 {
  86         u32 gp = iwl4965_read32(priv, CSR_EEPROM_GP);
  87         if ((gp & CSR_EEPROM_GP_VALID_MSK) == CSR_EEPROM_GP_BAD_SIGNATURE) {
  88                 IWL_ERROR("EEPROM not found, EEPROM_GP=0x%08x", gp);
  89                 return -ENOENT;
  90         }
  91         return 0;
  92 }
  93 EXPORT_SYMBOL(iwlcore_eeprom_verify_signature);
  94
  95 /*
  96  * The device's EEPROM semaphore prevents conflicts between driver and uCode
  97  * when accessing the EEPROM; each access is a series of pulses to/from the
  98  * EEPROM chip, not a single event, so even reads could conflict if they
  99  * weren't arbitrated by the semaphore.
 100  */
 101 int iwlcore_eeprom_acquire_semaphore(struct iwl4965_priv *priv)
 102 {
 103         u16 count;
 104         int ret;
 105
 106         for (count = 0; count < EEPROM_SEM_RETRY_LIMIT; count++) {
 107                 /* Request semaphore */
 108                 iwl4965_set_bit(priv, CSR_HW_IF_CONFIG_REG,
 109                         CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);
 110
 111                 /* See if we got it */
 112                 ret = iwl4965_poll_bit(priv, CSR_HW_IF_CONFIG_REG,
 113                                         CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM,
 114                                         CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM,
 115                                         EEPROM_SEM_TIMEOUT);
 116                 if (ret >= 0) {
 117                         IWL_DEBUG_IO("Acquired semaphore after %d tries.\n",
 118                                 count+1);
 119                         return ret;
 120                 }
 121         }
 122
 123         return ret;
 124 }
 125 EXPORT_SYMBOL(iwlcore_eeprom_acquire_semaphore);
 126
 127 void iwlcore_eeprom_release_semaphore(struct iwl4965_priv *priv)
 128 {
 129         iwl4965_clear_bit(priv, CSR_HW_IF_CONFIG_REG,
 130                 CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);
 131
 132 }
 133 EXPORT_SYMBOL(iwlcore_eeprom_release_semaphore);
 134
 135
 136 /**
 137  * iwl_eeprom_init - read EEPROM contents
 138  *
 139  * Load the EEPROM contents from adapter into priv->eeprom
 140  *
 141  * NOTE:  This routine uses the non-debug IO access functions.
 142  */
 143 int iwl_eeprom_init(struct iwl4965_priv *priv)
 144 {
 145         u16 *e = (u16 *)&priv->eeprom;
 146         u32 gp = iwl4965_read32(priv, CSR_EEPROM_GP);
 147         u32 r;
 148         int sz = sizeof(priv->eeprom);
 149         int ret;
 150         int i;
 151         u16 addr;
 152
 153         /* The EEPROM structure has several padding buffers within it
 154          * and when adding new EEPROM maps is subject to programmer errors
 155          * which may be very difficult to identify without explicitly
 156          * checking the resulting size of the eeprom map. */
 157         BUILD_BUG_ON(sizeof(priv->eeprom) != IWL_EEPROM_IMAGE_SIZE);
 158
 159         if ((gp & CSR_EEPROM_GP_VALID_MSK) == CSR_EEPROM_GP_BAD_SIGNATURE) {
 160                 IWL_ERROR("EEPROM not found, EEPROM_GP=0x%08x", gp);
 161                 return -ENOENT;
 162         }
 163
 164         /* Make sure driver (instead of uCode) is allowed to read EEPROM */
 165         ret = priv->cfg->ops->lib->eeprom_ops.acquire_semaphore(priv);
 166         if (ret < 0) {
 167                 IWL_ERROR("Failed to acquire EEPROM semaphore.\n");
 168                 return -ENOENT;
 169         }
 170
 171         /* eeprom is an array of 16bit values */
 172         for (addr = 0; addr < sz; addr += sizeof(u16)) {
 173                 _iwl4965_write32(priv, CSR_EEPROM_REG, addr << 1);
 174                 _iwl4965_clear_bit(priv, CSR_EEPROM_REG, CSR_EEPROM_REG_BIT_CMD);
 175
 176                 for (i = 0; i < IWL_EEPROM_ACCESS_TIMEOUT;
 177                                         i += IWL_EEPROM_ACCESS_DELAY) {
 178                         r = _iwl4965_read_direct32(priv, CSR_EEPROM_REG);
 179                         if (r & CSR_EEPROM_REG_READ_VALID_MSK)
 180                                 break;
 181                         udelay(IWL_EEPROM_ACCESS_DELAY);
 182                 }
 183
 184                 if (!(r & CSR_EEPROM_REG_READ_VALID_MSK)) {
 185                         IWL_ERROR("Time out reading EEPROM[%d]", addr);
 186                         ret = -ETIMEDOUT;
 187                         goto done;
 188                 }
 189                 e[addr / 2] = le16_to_cpu((__force __le16)(r >> 16));
 190         }
 191         ret = 0;
 192
 193 done:
 194         priv->cfg->ops->lib->eeprom_ops.release_semaphore(priv);
 195         return ret;
 196 }
 197 EXPORT_SYMBOL(iwl_eeprom_init);
 198
 199
 200 void iwl_eeprom_get_mac(const struct iwl4965_priv *priv, u8 *mac)
 201 {
 202         memcpy(mac, priv->eeprom.mac_address, 6);
 203 }
 204 EXPORT_SYMBOL(iwl_eeprom_get_mac);
 205