/******************************************************************************
 *
 * 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) 2012 - 2013 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 COPYING.
 *
 * Contact Information:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2012 - 2013 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/firmware.h>
#include "iwl-trans.h"
#include "mvm.h"
#include "iwl-eeprom-parse.h"
#include "iwl-eeprom-read.h"
#include "iwl-nvm-parse.h"

/* list of NVM sections we are allowed/need to read */
static const int nvm_to_read[] = {
	NVM_SECTION_TYPE_HW,
	NVM_SECTION_TYPE_SW,
	NVM_SECTION_TYPE_CALIBRATION,
	NVM_SECTION_TYPE_PRODUCTION,
};

/* Default NVM size to read */
#define IWL_NVM_DEFAULT_CHUNK_SIZE (2*1024)
#define IWL_MAX_NVM_SECTION_SIZE 6000

#define NVM_WRITE_OPCODE 1
#define NVM_READ_OPCODE 0

/*
 * prepare the NVM host command w/ the pointers to the nvm buffer
 * and send it to fw
 */
static int iwl_nvm_write_chunk(struct iwl_mvm *mvm, u16 section,
			       u16 offset, u16 length, const u8 *data)
{
	struct iwl_nvm_access_cmd nvm_access_cmd = {
		.offset = cpu_to_le16(offset),
		.length = cpu_to_le16(length),
		.type = cpu_to_le16(section),
		.op_code = NVM_WRITE_OPCODE,
	};
	struct iwl_host_cmd cmd = {
		.id = NVM_ACCESS_CMD,
		.len = { sizeof(struct iwl_nvm_access_cmd), length },
		.flags = CMD_SYNC | CMD_SEND_IN_RFKILL,
		.data = { &nvm_access_cmd, data },
		/* data may come from vmalloc, so use _DUP */
		.dataflags = { 0, IWL_HCMD_DFL_DUP },
	};

	return iwl_mvm_send_cmd(mvm, &cmd);
}

static int iwl_nvm_read_chunk(struct iwl_mvm *mvm, u16 section,
			      u16 offset, u16 length, u8 *data)
{
	struct iwl_nvm_access_cmd nvm_access_cmd = {
		.offset = cpu_to_le16(offset),
		.length = cpu_to_le16(length),
		.type = cpu_to_le16(section),
		.op_code = NVM_READ_OPCODE,
	};
	struct iwl_nvm_access_resp *nvm_resp;
	struct iwl_rx_packet *pkt;
	struct iwl_host_cmd cmd = {
		.id = NVM_ACCESS_CMD,
		.flags = CMD_SYNC | CMD_WANT_SKB | CMD_SEND_IN_RFKILL,
		.data = { &nvm_access_cmd, },
	};
	int ret, bytes_read, offset_read;
	u8 *resp_data;

	cmd.len[0] = sizeof(struct iwl_nvm_access_cmd);

	ret = iwl_mvm_send_cmd(mvm, &cmd);
	if (ret)
		return ret;

	pkt = cmd.resp_pkt;
	if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
		IWL_ERR(mvm, "Bad return from NVM_ACCES_COMMAND (0x%08X)\n",
			pkt->hdr.flags);
		ret = -EIO;
		goto exit;
	}

	/* Extract NVM response */
	nvm_resp = (void *)pkt->data;
	ret = le16_to_cpu(nvm_resp->status);
	bytes_read = le16_to_cpu(nvm_resp->length);
	offset_read = le16_to_cpu(nvm_resp->offset);
	resp_data = nvm_resp->data;
	if (ret) {
		IWL_ERR(mvm,
			"NVM access command failed with status %d (device: %s)\n",
			ret, mvm->cfg->name);
		ret = -EINVAL;
		goto exit;
	}

	if (offset_read != offset) {
		IWL_ERR(mvm, "NVM ACCESS response with invalid offset %d\n",
			offset_read);
		ret = -EINVAL;
		goto exit;
	}

	/* Write data to NVM */
	memcpy(data + offset, resp_data, bytes_read);
	ret = bytes_read;

exit:
	iwl_free_resp(&cmd);
	return ret;
}

static int iwl_nvm_write_section(struct iwl_mvm *mvm, u16 section,
				 const u8 *data, u16 length)
{
	int offset = 0;

	/* copy data in chunks of 2k (and remainder if any) */

	while (offset < length) {
		int chunk_size, ret;

		chunk_size = min(IWL_NVM_DEFAULT_CHUNK_SIZE,
				 length - offset);

		ret = iwl_nvm_write_chunk(mvm, section, offset,
					  chunk_size, data + offset);
		if (ret < 0)
			return ret;

		offset += chunk_size;
	}

	return 0;
}

/*
 * Reads an NVM section completely.
 * NICs prior to 7000 family doesn't have a real NVM, but just read
 * section 0 which is the EEPROM. Because the EEPROM reading is unlimited
 * by uCode, we need to manually check in this case that we don't
 * overflow and try to read more than the EEPROM size.
 * For 7000 family NICs, we supply the maximal size we can read, and
 * the uCode fills the response with as much data as we can,
 * without overflowing, so no check is needed.
 */
static int iwl_nvm_read_section(struct iwl_mvm *mvm, u16 section,
				u8 *data)
{
	u16 length, offset = 0;
	int ret;

	/* Set nvm section read length */
	length = IWL_NVM_DEFAULT_CHUNK_SIZE;

	ret = length;

	/* Read the NVM until exhausted (reading less than requested) */
	while (ret == length) {
		ret = iwl_nvm_read_chunk(mvm, section, offset, length, data);
		if (ret < 0) {
			IWL_ERR(mvm,
				"Cannot read NVM from section %d offset %d, length %d\n",
				section, offset, length);
			return ret;
		}
		offset += ret;
	}

	IWL_DEBUG_EEPROM(mvm->trans->dev,
			 "NVM section %d read completed\n", section);
	return offset;
}

static struct iwl_nvm_data *
iwl_parse_nvm_sections(struct iwl_mvm *mvm)
{
	struct iwl_nvm_section *sections = mvm->nvm_sections;
	const __le16 *hw, *sw, *calib;

	/* Checking for required sections */
	if (!mvm->nvm_sections[NVM_SECTION_TYPE_SW].data ||
	    !mvm->nvm_sections[NVM_SECTION_TYPE_HW].data) {
		IWL_ERR(mvm, "Can't parse empty NVM sections\n");
		return NULL;
	}

	if (WARN_ON(!mvm->cfg))
		return NULL;

	hw = (const __le16 *)sections[NVM_SECTION_TYPE_HW].data;
	sw = (const __le16 *)sections[NVM_SECTION_TYPE_SW].data;
	calib = (const __le16 *)sections[NVM_SECTION_TYPE_CALIBRATION].data;
	return iwl_parse_nvm_data(mvm->trans->dev, mvm->cfg, hw, sw, calib,
				  iwl_fw_valid_tx_ant(mvm->fw),
				  iwl_fw_valid_rx_ant(mvm->fw));
}

#define MAX_NVM_FILE_LEN	16384

/*
 * HOW TO CREATE THE NVM FILE FORMAT:
 * ------------------------------
 * 1. create hex file, format:
 *      3800 -> header
 *      0000 -> header
 *      5a40 -> data
 *
 *   rev - 6 bit (word1)
 *   len - 10 bit (word1)
 *   id - 4 bit (word2)
 *   rsv - 12 bit (word2)
 *
 * 2. flip 8bits with 8 bits per line to get the right NVM file format
 *
 * 3. create binary file from the hex file
 *
 * 4. save as "iNVM_xxx.bin" under /lib/firmware
 */
static int iwl_mvm_load_external_nvm(struct iwl_mvm *mvm)
{
	int ret, section_id, section_size;
	const struct firmware *fw_entry;
	const struct {
		__le16 word1;
		__le16 word2;
		u8 data[];
	} *file_sec;
	const u8 *eof;

#define NVM_WORD1_LEN(x) (8 * (x & 0x03FF))
#define NVM_WORD2_ID(x) (x >> 12)

	/*
	 * Obtain NVM image via request_firmware. Since we already used
	 * request_firmware_nowait() for the firmware binary load and only
	 * get here after that we assume the NVM request can be satisfied
	 * synchronously.
	 */
	ret = request_firmware(&fw_entry, iwlwifi_mod_params.nvm_file,
			       mvm->trans->dev);
	if (ret) {
		IWL_ERR(mvm, "ERROR: %s isn't available %d\n",
			iwlwifi_mod_params.nvm_file, ret);
		return ret;
	}

	IWL_INFO(mvm, "Loaded NVM file %s (%zu bytes)\n",
		 iwlwifi_mod_params.nvm_file, fw_entry->size);

	if (fw_entry->size < sizeof(*file_sec)) {
		IWL_ERR(mvm, "NVM file too small\n");
		ret = -EINVAL;
		goto out;
	}

	if (fw_entry->size > MAX_NVM_FILE_LEN) {
		IWL_ERR(mvm, "NVM file too large\n");
		ret = -EINVAL;
		goto out;
	}

	eof = fw_entry->data + fw_entry->size;

	file_sec = (void *)fw_entry->data;

	while (true) {
		if (file_sec->data > eof) {
			IWL_ERR(mvm,
				"ERROR - NVM file too short for section header\n");
			ret = -EINVAL;
			break;
		}

		/* check for EOF marker */
		if (!file_sec->word1 && !file_sec->word2) {
			ret = 0;
			break;
		}

		section_size = 2 * NVM_WORD1_LEN(le16_to_cpu(file_sec->word1));
		section_id = NVM_WORD2_ID(le16_to_cpu(file_sec->word2));

		if (section_size > IWL_MAX_NVM_SECTION_SIZE) {
			IWL_ERR(mvm, "ERROR - section too large (%d)\n",
				section_size);
			ret = -EINVAL;
			break;
		}

		if (!section_size) {
			IWL_ERR(mvm, "ERROR - section empty\n");
			ret = -EINVAL;
			break;
		}

		if (file_sec->data + section_size > eof) {
			IWL_ERR(mvm,
				"ERROR - NVM file too short for section (%d bytes)\n",
				section_size);
			ret = -EINVAL;
			break;
		}

		ret = iwl_nvm_write_section(mvm, section_id, file_sec->data,
					    section_size);
		if (ret < 0) {
			IWL_ERR(mvm, "iwl_mvm_send_cmd failed: %d\n", ret);
			break;
		}

		/* advance to the next section */
		file_sec = (void *)(file_sec->data + section_size);
	}
out:
	release_firmware(fw_entry);
	return ret;
}

int iwl_nvm_init(struct iwl_mvm *mvm)
{
	int ret, i, section;
	u8 *nvm_buffer, *temp;

	/* load external NVM if configured */
	if (iwlwifi_mod_params.nvm_file) {
		/* move to External NVM flow */
		ret = iwl_mvm_load_external_nvm(mvm);
		if (ret)
			return ret;
	}

	/* Read From FW NVM */
	IWL_DEBUG_EEPROM(mvm->trans->dev, "Read from NVM\n");

	/* TODO: find correct NVM max size for a section */
	nvm_buffer = kmalloc(mvm->cfg->base_params->eeprom_size,
			     GFP_KERNEL);
	if (!nvm_buffer)
		return -ENOMEM;
	for (i = 0; i < ARRAY_SIZE(nvm_to_read); i++) {
		section = nvm_to_read[i];
		/* we override the constness for initial read */
		ret = iwl_nvm_read_section(mvm, section, nvm_buffer);
		if (ret < 0)
			break;
		temp = kmemdup(nvm_buffer, ret, GFP_KERNEL);
		if (!temp) {
			ret = -ENOMEM;
			break;
		}
		mvm->nvm_sections[section].data = temp;
		mvm->nvm_sections[section].length = ret;
	}
	kfree(nvm_buffer);
	if (ret < 0)
		return ret;

	mvm->nvm_data = iwl_parse_nvm_sections(mvm);
	if (!mvm->nvm_data)
		return -ENODATA;

	return 0;
}
