iwlwifi: Moving EEPROM handling in iwlcore module

This patch move EEPROM code into iwl core module

Signed-off-by: Assaf Krauss <assaf.krauss@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 205 insertions, 0 deletions

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 <tomas.winkler@intel.com>
+ * 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 <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/init.h>
+
+#include <net/mac80211.h>
+
+#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);
+