From 34cf6ff6dd42cbc61fd652f893dcf71eed6052a5 Mon Sep 17 00:00:00 2001 From: Assaf Krauss Date: Thu, 6 Mar 2008 10:40:20 -0800 Subject: iwlwifi: Moving EEPROM handling in iwlcore module This patch move EEPROM code into iwl core module Signed-off-by: Assaf Krauss Signed-off-by: Tomas Winkler Signed-off-by: John W. Linville --- drivers/net/wireless/iwlwifi/iwl-eeprom.c | 205 ++++++++++++++++++++++++++++++ 1 file changed, 205 insertions(+) create mode 100644 drivers/net/wireless/iwlwifi/iwl-eeprom.c (limited to 'drivers/net/wireless/iwlwifi/iwl-eeprom.c') diff --git a/drivers/net/wireless/iwlwifi/iwl-eeprom.c b/drivers/net/wireless/iwlwifi/iwl-eeprom.c new file mode 100644 index 00000000000..0064387dea9 --- /dev/null +++ b/drivers/net/wireless/iwlwifi/iwl-eeprom.c @@ -0,0 +1,205 @@ +/****************************************************************************** + * + * This file is provided under a dual BSD/GPLv2 license. When using or + * redistributing this file, you may do so under either license. + * + * GPL LICENSE SUMMARY + * + * Copyright(c) 2008 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * 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; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110, + * USA + * + * The full GNU General Public License is included in this distribution + * in the file called LICENSE.GPL. + * + * Contact Information: + * Tomas Winkler + * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 + * + * BSD LICENSE + * + * Copyright(c) 2005 - 2008 Intel Corporation. All rights reserved. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + *****************************************************************************/ + + +#include +#include +#include +#include + +#include + +#include "iwl-4965-commands.h" +#include "iwl-4965.h" +#include "iwl-core.h" +#include "iwl-4965-debug.h" +#include "iwl-eeprom.h" +#include "iwl-4965-io.h" + +/****************************************************************************** + * + * EEPROM related functions + * +******************************************************************************/ + +int iwlcore_eeprom_verify_signature(struct iwl4965_priv *priv) +{ + u32 gp = iwl4965_read32(priv, CSR_EEPROM_GP); + if ((gp & CSR_EEPROM_GP_VALID_MSK) == CSR_EEPROM_GP_BAD_SIGNATURE) { + IWL_ERROR("EEPROM not found, EEPROM_GP=0x%08x", gp); + return -ENOENT; + } + return 0; +} +EXPORT_SYMBOL(iwlcore_eeprom_verify_signature); + +/* + * The device's EEPROM semaphore prevents conflicts between driver and uCode + * when accessing the EEPROM; each access is a series of pulses to/from the + * EEPROM chip, not a single event, so even reads could conflict if they + * weren't arbitrated by the semaphore. + */ +int iwlcore_eeprom_acquire_semaphore(struct iwl4965_priv *priv) +{ + u16 count; + int ret; + + for (count = 0; count < EEPROM_SEM_RETRY_LIMIT; count++) { + /* Request semaphore */ + iwl4965_set_bit(priv, CSR_HW_IF_CONFIG_REG, + CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM); + + /* See if we got it */ + ret = iwl4965_poll_bit(priv, CSR_HW_IF_CONFIG_REG, + CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM, + CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM, + EEPROM_SEM_TIMEOUT); + if (ret >= 0) { + IWL_DEBUG_IO("Acquired semaphore after %d tries.\n", + count+1); + return ret; + } + } + + return ret; +} +EXPORT_SYMBOL(iwlcore_eeprom_acquire_semaphore); + +void iwlcore_eeprom_release_semaphore(struct iwl4965_priv *priv) +{ + iwl4965_clear_bit(priv, CSR_HW_IF_CONFIG_REG, + CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM); + +} +EXPORT_SYMBOL(iwlcore_eeprom_release_semaphore); + + +/** + * iwl_eeprom_init - read EEPROM contents + * + * Load the EEPROM contents from adapter into priv->eeprom + * + * NOTE: This routine uses the non-debug IO access functions. + */ +int iwl_eeprom_init(struct iwl4965_priv *priv) +{ + u16 *e = (u16 *)&priv->eeprom; + u32 gp = iwl4965_read32(priv, CSR_EEPROM_GP); + u32 r; + int sz = sizeof(priv->eeprom); + int ret; + int i; + u16 addr; + + /* The EEPROM structure has several padding buffers within it + * and when adding new EEPROM maps is subject to programmer errors + * which may be very difficult to identify without explicitly + * checking the resulting size of the eeprom map. */ + BUILD_BUG_ON(sizeof(priv->eeprom) != IWL_EEPROM_IMAGE_SIZE); + + if ((gp & CSR_EEPROM_GP_VALID_MSK) == CSR_EEPROM_GP_BAD_SIGNATURE) { + IWL_ERROR("EEPROM not found, EEPROM_GP=0x%08x", gp); + return -ENOENT; + } + + /* Make sure driver (instead of uCode) is allowed to read EEPROM */ + ret = priv->cfg->ops->lib->eeprom_ops.acquire_semaphore(priv); + if (ret < 0) { + IWL_ERROR("Failed to acquire EEPROM semaphore.\n"); + return -ENOENT; + } + + /* eeprom is an array of 16bit values */ + for (addr = 0; addr < sz; addr += sizeof(u16)) { + _iwl4965_write32(priv, CSR_EEPROM_REG, addr << 1); + _iwl4965_clear_bit(priv, CSR_EEPROM_REG, CSR_EEPROM_REG_BIT_CMD); + + for (i = 0; i < IWL_EEPROM_ACCESS_TIMEOUT; + i += IWL_EEPROM_ACCESS_DELAY) { + r = _iwl4965_read_direct32(priv, CSR_EEPROM_REG); + if (r & CSR_EEPROM_REG_READ_VALID_MSK) + break; + udelay(IWL_EEPROM_ACCESS_DELAY); + } + + if (!(r & CSR_EEPROM_REG_READ_VALID_MSK)) { + IWL_ERROR("Time out reading EEPROM[%d]", addr); + ret = -ETIMEDOUT; + goto done; + } + e[addr / 2] = le16_to_cpu((__force __le16)(r >> 16)); + } + ret = 0; + +done: + priv->cfg->ops->lib->eeprom_ops.release_semaphore(priv); + return ret; +} +EXPORT_SYMBOL(iwl_eeprom_init); + + +void iwl_eeprom_get_mac(const struct iwl4965_priv *priv, u8 *mac) +{ + memcpy(mac, priv->eeprom.mac_address, 6); +} +EXPORT_SYMBOL(iwl_eeprom_get_mac); + -- cgit v1.2.3