drivers/net/wireless/intel/iwlwifi/fw/paging.c - arm/linux - Git at Google

 /******************************************************************************
  *
  * 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 - 2014 Intel Corporation. All rights reserved.
  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
  *
  * 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.
  *
  * The full GNU General Public License is included in this distribution
  * in the file called COPYING.
  *
  * Contact Information:
  *  Intel Linux Wireless <linuxwifi@intel.com>
  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  *
  * BSD LICENSE
  *
  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
  * 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 "iwl-drv.h"
 #include "runtime.h"
 #include "fw/api/commands.h"

 void iwl_free_fw_paging(struct iwl_fw_runtime *fwrt)
 {
 	int i;

 	if (!fwrt->fw_paging_db[0].fw_paging_block)
 		return;

 	for (i = 0; i < NUM_OF_FW_PAGING_BLOCKS; i++) {
 		struct iwl_fw_paging *paging = &fwrt->fw_paging_db[i];

 		if (!paging->fw_paging_block) {
 			IWL_DEBUG_FW(fwrt,
 				     "Paging: block %d already freed, continue to next page\n",
 				     i);

 			continue;
 		}
 		dma_unmap_page(fwrt->trans->dev, paging->fw_paging_phys,
 			       paging->fw_paging_size, DMA_BIDIRECTIONAL);

 		__free_pages(paging->fw_paging_block,
 			     get_order(paging->fw_paging_size));
 		paging->fw_paging_block = NULL;
 	}
 	kfree(fwrt->trans->paging_download_buf);
 	fwrt->trans->paging_download_buf = NULL;
 	fwrt->trans->paging_db = NULL;

 	memset(fwrt->fw_paging_db, 0, sizeof(fwrt->fw_paging_db));
 }
 IWL_EXPORT_SYMBOL(iwl_free_fw_paging);

 static int iwl_alloc_fw_paging_mem(struct iwl_fw_runtime *fwrt,
 				   const struct fw_img *image)
 {
 	struct page *block;
 	dma_addr_t phys = 0;
 	int blk_idx, order, num_of_pages, size, dma_enabled;

 	if (fwrt->fw_paging_db[0].fw_paging_block)
 		return 0;

 	dma_enabled = is_device_dma_capable(fwrt->trans->dev);

 	/* ensure BLOCK_2_EXP_SIZE is power of 2 of PAGING_BLOCK_SIZE */
 	BUILD_BUG_ON(BIT(BLOCK_2_EXP_SIZE) != PAGING_BLOCK_SIZE);

 	num_of_pages = image->paging_mem_size / FW_PAGING_SIZE;
 	fwrt->num_of_paging_blk =
 		DIV_ROUND_UP(num_of_pages, NUM_OF_PAGE_PER_GROUP);
 	fwrt->num_of_pages_in_last_blk =
 		num_of_pages -
 		NUM_OF_PAGE_PER_GROUP * (fwrt->num_of_paging_blk - 1);

 	IWL_DEBUG_FW(fwrt,
 		     "Paging: allocating mem for %d paging blocks, each block holds 8 pages, last block holds %d pages\n",
 		     fwrt->num_of_paging_blk,
 		     fwrt->num_of_pages_in_last_blk);

 	/*
 	 * Allocate CSS and paging blocks in dram.
 	 */
 	for (blk_idx = 0; blk_idx < fwrt->num_of_paging_blk + 1; blk_idx++) {
 		/* For CSS allocate 4KB, for others PAGING_BLOCK_SIZE (32K) */
 		size = blk_idx ? PAGING_BLOCK_SIZE : FW_PAGING_SIZE;
 		order = get_order(size);
 		block = alloc_pages(GFP_KERNEL, order);
 		if (!block) {
 			/* free all the previous pages since we failed */
 			iwl_free_fw_paging(fwrt);
 			return -ENOMEM;
 		}

 		fwrt->fw_paging_db[blk_idx].fw_paging_block = block;
 		fwrt->fw_paging_db[blk_idx].fw_paging_size = size;

 		if (dma_enabled) {
 			phys = dma_map_page(fwrt->trans->dev, block, 0,
 					    PAGE_SIZE << order,
 					    DMA_BIDIRECTIONAL);
 			if (dma_mapping_error(fwrt->trans->dev, phys)) {
 				/*
 				 * free the previous pages and the current one
 				 * since we failed to map_page.
 				 */
 				iwl_free_fw_paging(fwrt);
 				return -ENOMEM;
 			}
 			fwrt->fw_paging_db[blk_idx].fw_paging_phys = phys;
 		} else {
 			fwrt->fw_paging_db[blk_idx].fw_paging_phys =
 				PAGING_ADDR_SIG |
 				blk_idx << BLOCK_2_EXP_SIZE;
 		}

 		if (!blk_idx)
 			IWL_DEBUG_FW(fwrt,
 				     "Paging: allocated 4K(CSS) bytes (order %d) for firmware paging.\n",
 				     order);
 		else
 			IWL_DEBUG_FW(fwrt,
 				     "Paging: allocated 32K bytes (order %d) for firmware paging.\n",
 				     order);
 	}

 	return 0;
 }

 static int iwl_fill_paging_mem(struct iwl_fw_runtime *fwrt,
 			       const struct fw_img *image)
 {
 	int sec_idx, idx;
 	u32 offset = 0;

 	/*
 	 * find where is the paging image start point:
 	 * if CPU2 exist and it's in paging format, then the image looks like:
 	 * CPU1 sections (2 or more)
 	 * CPU1_CPU2_SEPARATOR_SECTION delimiter - separate between CPU1 to CPU2
 	 * CPU2 sections (not paged)
 	 * PAGING_SEPARATOR_SECTION delimiter - separate between CPU2
 	 * non paged to CPU2 paging sec
 	 * CPU2 paging CSS
 	 * CPU2 paging image (including instruction and data)
 	 */
 	for (sec_idx = 0; sec_idx < image->num_sec; sec_idx++) {
 		if (image->sec[sec_idx].offset == PAGING_SEPARATOR_SECTION) {
 			sec_idx++;
 			break;
 		}
 	}

 	/*
 	 * If paging is enabled there should be at least 2 more sections left
 	 * (one for CSS and one for Paging data)
 	 */
 	if (sec_idx >= image->num_sec - 1) {
 		IWL_ERR(fwrt, "Paging: Missing CSS and/or paging sections\n");
 		iwl_free_fw_paging(fwrt);
 		return -EINVAL;
 	}

 	/* copy the CSS block to the dram */
 	IWL_DEBUG_FW(fwrt, "Paging: load paging CSS to FW, sec = %d\n",
 		     sec_idx);

 	memcpy(page_address(fwrt->fw_paging_db[0].fw_paging_block),
 	       image->sec[sec_idx].data,
 	       fwrt->fw_paging_db[0].fw_paging_size);
 	dma_sync_single_for_device(fwrt->trans->dev,
 				   fwrt->fw_paging_db[0].fw_paging_phys,
 				   fwrt->fw_paging_db[0].fw_paging_size,
 				   DMA_BIDIRECTIONAL);

 	IWL_DEBUG_FW(fwrt,
 		     "Paging: copied %d CSS bytes to first block\n",
 		     fwrt->fw_paging_db[0].fw_paging_size);

 	sec_idx++;

 	/*
 	 * copy the paging blocks to the dram
 	 * loop index start from 1 since that CSS block already copied to dram
 	 * and CSS index is 0.
 	 * loop stop at num_of_paging_blk since that last block is not full.
 	 */
 	for (idx = 1; idx < fwrt->num_of_paging_blk; idx++) {
 		struct iwl_fw_paging *block = &fwrt->fw_paging_db[idx];

 		memcpy(page_address(block->fw_paging_block),
 		       image->sec[sec_idx].data + offset,
 		       block->fw_paging_size);
 		dma_sync_single_for_device(fwrt->trans->dev,
 					   block->fw_paging_phys,
 					   block->fw_paging_size,
 					   DMA_BIDIRECTIONAL);

 		IWL_DEBUG_FW(fwrt,
 			     "Paging: copied %d paging bytes to block %d\n",
 			     fwrt->fw_paging_db[idx].fw_paging_size,
 			     idx);

 		offset += fwrt->fw_paging_db[idx].fw_paging_size;
 	}

 	/* copy the last paging block */
 	if (fwrt->num_of_pages_in_last_blk > 0) {
 		struct iwl_fw_paging *block = &fwrt->fw_paging_db[idx];

 		memcpy(page_address(block->fw_paging_block),
 		       image->sec[sec_idx].data + offset,
 		       FW_PAGING_SIZE * fwrt->num_of_pages_in_last_blk);
 		dma_sync_single_for_device(fwrt->trans->dev,
 					   block->fw_paging_phys,
 					   block->fw_paging_size,
 					   DMA_BIDIRECTIONAL);

 		IWL_DEBUG_FW(fwrt,
 			     "Paging: copied %d pages in the last block %d\n",
 			     fwrt->num_of_pages_in_last_blk, idx);
 	}

 	return 0;
 }

 static int iwl_save_fw_paging(struct iwl_fw_runtime *fwrt,
 			      const struct fw_img *fw)
 {
 	int ret;

 	ret = iwl_alloc_fw_paging_mem(fwrt, fw);
 	if (ret)
 		return ret;

 	return iwl_fill_paging_mem(fwrt, fw);
 }

 /* send paging cmd to FW in case CPU2 has paging image */
 static int iwl_send_paging_cmd(struct iwl_fw_runtime *fwrt,
 			       const struct fw_img *fw)
 {
 	struct iwl_fw_paging_cmd paging_cmd = {
 		.flags = cpu_to_le32(PAGING_CMD_IS_SECURED |
 				     PAGING_CMD_IS_ENABLED |
 				     (fwrt->num_of_pages_in_last_blk <<
 				      PAGING_CMD_NUM_OF_PAGES_IN_LAST_GRP_POS)),
 		.block_size = cpu_to_le32(BLOCK_2_EXP_SIZE),
 		.block_num = cpu_to_le32(fwrt->num_of_paging_blk),
 	};
 	struct iwl_host_cmd hcmd = {
 		.id = iwl_cmd_id(FW_PAGING_BLOCK_CMD, IWL_ALWAYS_LONG_GROUP, 0),
 		.len = { sizeof(paging_cmd), },
 		.data = { &paging_cmd, },
 	};
 	int blk_idx;

 	/* loop for for all paging blocks + CSS block */
 	for (blk_idx = 0; blk_idx < fwrt->num_of_paging_blk + 1; blk_idx++) {
 		dma_addr_t addr = fwrt->fw_paging_db[blk_idx].fw_paging_phys;
 		__le32 phy_addr;

 		addr = addr >> PAGE_2_EXP_SIZE;
 		phy_addr = cpu_to_le32(addr);
 		paging_cmd.device_phy_addr[blk_idx] = phy_addr;
 	}

 	return iwl_trans_send_cmd(fwrt->trans, &hcmd);
 }

 /*
  * Send paging item cmd to FW in case CPU2 has paging image
  */
 static int iwl_trans_get_paging_item(struct iwl_fw_runtime *fwrt)
 {
 	int ret;
 	struct iwl_fw_get_item_cmd fw_get_item_cmd = {
 		.item_id = cpu_to_le32(IWL_FW_ITEM_ID_PAGING),
 	};
 	struct iwl_fw_get_item_resp *item_resp;
 	struct iwl_host_cmd cmd = {
 		.id = iwl_cmd_id(FW_GET_ITEM_CMD, IWL_ALWAYS_LONG_GROUP, 0),
 		.flags = CMD_WANT_SKB | CMD_SEND_IN_RFKILL,
 		.data = { &fw_get_item_cmd, },
 		.len = { sizeof(fw_get_item_cmd), },
 	};

 	ret = iwl_trans_send_cmd(fwrt->trans, &cmd);
 	if (ret) {
 		IWL_ERR(fwrt,
 			"Paging: Failed to send FW_GET_ITEM_CMD cmd (err = %d)\n",
 			ret);
 		return ret;
 	}

 	item_resp = (void *)((struct iwl_rx_packet *)cmd.resp_pkt)->data;
 	if (item_resp->item_id != cpu_to_le32(IWL_FW_ITEM_ID_PAGING)) {
 		IWL_ERR(fwrt,
 			"Paging: got wrong item in FW_GET_ITEM_CMD resp (item_id = %u)\n",
 			le32_to_cpu(item_resp->item_id));
 		ret = -EIO;
 		goto exit;
 	}

 	/* Add an extra page for headers */
 	fwrt->trans->paging_download_buf = kzalloc(PAGING_BLOCK_SIZE +
 						  FW_PAGING_SIZE,
 						  GFP_KERNEL);
 	if (!fwrt->trans->paging_download_buf) {
 		ret = -ENOMEM;
 		goto exit;
 	}
 	fwrt->trans->paging_req_addr = le32_to_cpu(item_resp->item_val);
 	fwrt->trans->paging_db = fwrt->fw_paging_db;
 	IWL_DEBUG_FW(fwrt,
 		     "Paging: got paging request address (paging_req_addr 0x%08x)\n",
 		     fwrt->trans->paging_req_addr);

 exit:
 	iwl_free_resp(&cmd);

 	return ret;
 }

 int iwl_init_paging(struct iwl_fw_runtime *fwrt, enum iwl_ucode_type type)
 {
 	const struct fw_img *fw = &fwrt->fw->img[type];
 	int ret;

 	if (fwrt->trans->cfg->gen2)
 		return 0;

 	/*
 	 * Configure and operate fw paging mechanism.
 	 * The driver configures the paging flow only once.
 	 * The CPU2 paging image is included in the IWL_UCODE_INIT image.
 	 */
 	if (!fw->paging_mem_size)
 		return 0;

 	/*
 	 * When dma is not enabled, the driver needs to copy / write
 	 * the downloaded / uploaded page to / from the smem.
 	 * This gets the location of the place were the pages are
 	 * stored.
 	 */
 	if (!is_device_dma_capable(fwrt->trans->dev)) {
 		ret = iwl_trans_get_paging_item(fwrt);
 		if (ret) {
 			IWL_ERR(fwrt, "failed to get FW paging item\n");
 			return ret;
 		}
 	}

 	ret = iwl_save_fw_paging(fwrt, fw);
 	if (ret) {
 		IWL_ERR(fwrt, "failed to save the FW paging image\n");
 		return ret;
 	}

 	ret = iwl_send_paging_cmd(fwrt, fw);
 	if (ret) {
 		IWL_ERR(fwrt, "failed to send the paging cmd\n");
 		iwl_free_fw_paging(fwrt);
 		return ret;
 	}

 	return 0;
 }
 IWL_EXPORT_SYMBOL(iwl_init_paging);
	/******************************************************************************
	*
	* 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 - 2014 Intel Corporation. All rights reserved.
	* Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
	* Copyright(c) 2016 - 2017 Intel Deutschland GmbH
	*
	* 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.
	*
	* The full GNU General Public License is included in this distribution
	* in the file called COPYING.
	*
	* Contact Information:
	* Intel Linux Wireless <linuxwifi@intel.com>
	* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
	*
	* BSD LICENSE
	*
	* Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
	* Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
	* Copyright(c) 2016 - 2017 Intel Deutschland GmbH
	* 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 "iwl-drv.h"
	#include "runtime.h"
	#include "fw/api/commands.h"

	void iwl_free_fw_paging(struct iwl_fw_runtime *fwrt)
	{
	int i;

	if (!fwrt->fw_paging_db[0].fw_paging_block)
	return;

	for (i = 0; i < NUM_OF_FW_PAGING_BLOCKS; i++) {
	struct iwl_fw_paging *paging = &fwrt->fw_paging_db[i];

	if (!paging->fw_paging_block) {
	IWL_DEBUG_FW(fwrt,
	"Paging: block %d already freed, continue to next page\n",
	i);

	continue;
	}
	dma_unmap_page(fwrt->trans->dev, paging->fw_paging_phys,
	paging->fw_paging_size, DMA_BIDIRECTIONAL);

	__free_pages(paging->fw_paging_block,
	get_order(paging->fw_paging_size));
	paging->fw_paging_block = NULL;
	}
	kfree(fwrt->trans->paging_download_buf);
	fwrt->trans->paging_download_buf = NULL;
	fwrt->trans->paging_db = NULL;

	memset(fwrt->fw_paging_db, 0, sizeof(fwrt->fw_paging_db));
	}
	IWL_EXPORT_SYMBOL(iwl_free_fw_paging);

	static int iwl_alloc_fw_paging_mem(struct iwl_fw_runtime *fwrt,
	const struct fw_img *image)
	{
	struct page *block;
	dma_addr_t phys = 0;
	int blk_idx, order, num_of_pages, size, dma_enabled;

	if (fwrt->fw_paging_db[0].fw_paging_block)
	return 0;

	dma_enabled = is_device_dma_capable(fwrt->trans->dev);

	/* ensure BLOCK_2_EXP_SIZE is power of 2 of PAGING_BLOCK_SIZE */
	BUILD_BUG_ON(BIT(BLOCK_2_EXP_SIZE) != PAGING_BLOCK_SIZE);

	num_of_pages = image->paging_mem_size / FW_PAGING_SIZE;
	fwrt->num_of_paging_blk =
	DIV_ROUND_UP(num_of_pages, NUM_OF_PAGE_PER_GROUP);
	fwrt->num_of_pages_in_last_blk =
	num_of_pages -
	NUM_OF_PAGE_PER_GROUP * (fwrt->num_of_paging_blk - 1);

	IWL_DEBUG_FW(fwrt,
	"Paging: allocating mem for %d paging blocks, each block holds 8 pages, last block holds %d pages\n",
	fwrt->num_of_paging_blk,
	fwrt->num_of_pages_in_last_blk);

	/*
	* Allocate CSS and paging blocks in dram.
	*/
	for (blk_idx = 0; blk_idx < fwrt->num_of_paging_blk + 1; blk_idx++) {
	/* For CSS allocate 4KB, for others PAGING_BLOCK_SIZE (32K) */
	size = blk_idx ? PAGING_BLOCK_SIZE : FW_PAGING_SIZE;
	order = get_order(size);
	block = alloc_pages(GFP_KERNEL, order);
	if (!block) {
	/* free all the previous pages since we failed */
	iwl_free_fw_paging(fwrt);
	return -ENOMEM;
	}

	fwrt->fw_paging_db[blk_idx].fw_paging_block = block;
	fwrt->fw_paging_db[blk_idx].fw_paging_size = size;

	if (dma_enabled) {
	phys = dma_map_page(fwrt->trans->dev, block, 0,
	PAGE_SIZE << order,
	DMA_BIDIRECTIONAL);
	if (dma_mapping_error(fwrt->trans->dev, phys)) {
	/*
	* free the previous pages and the current one
	* since we failed to map_page.
	*/
	iwl_free_fw_paging(fwrt);
	return -ENOMEM;
	}
	fwrt->fw_paging_db[blk_idx].fw_paging_phys = phys;
	} else {
	fwrt->fw_paging_db[blk_idx].fw_paging_phys =
	PAGING_ADDR_SIG \|
	blk_idx << BLOCK_2_EXP_SIZE;
	}

	if (!blk_idx)
	IWL_DEBUG_FW(fwrt,
	"Paging: allocated 4K(CSS) bytes (order %d) for firmware paging.\n",
	order);
	else
	IWL_DEBUG_FW(fwrt,
	"Paging: allocated 32K bytes (order %d) for firmware paging.\n",
	order);
	}

	return 0;
	}

	static int iwl_fill_paging_mem(struct iwl_fw_runtime *fwrt,
	const struct fw_img *image)
	{
	int sec_idx, idx;
	u32 offset = 0;

	/*
	* find where is the paging image start point:
	* if CPU2 exist and it's in paging format, then the image looks like:
	* CPU1 sections (2 or more)
	* CPU1_CPU2_SEPARATOR_SECTION delimiter - separate between CPU1 to CPU2
	* CPU2 sections (not paged)
	* PAGING_SEPARATOR_SECTION delimiter - separate between CPU2
	* non paged to CPU2 paging sec
	* CPU2 paging CSS
	* CPU2 paging image (including instruction and data)
	*/
	for (sec_idx = 0; sec_idx < image->num_sec; sec_idx++) {
	if (image->sec[sec_idx].offset == PAGING_SEPARATOR_SECTION) {
	sec_idx++;
	break;
	}
	}

	/*
	* If paging is enabled there should be at least 2 more sections left
	* (one for CSS and one for Paging data)
	*/
	if (sec_idx >= image->num_sec - 1) {
	IWL_ERR(fwrt, "Paging: Missing CSS and/or paging sections\n");
	iwl_free_fw_paging(fwrt);
	return -EINVAL;
	}

	/* copy the CSS block to the dram */
	IWL_DEBUG_FW(fwrt, "Paging: load paging CSS to FW, sec = %d\n",
	sec_idx);

	memcpy(page_address(fwrt->fw_paging_db[0].fw_paging_block),
	image->sec[sec_idx].data,
	fwrt->fw_paging_db[0].fw_paging_size);
	dma_sync_single_for_device(fwrt->trans->dev,
	fwrt->fw_paging_db[0].fw_paging_phys,
	fwrt->fw_paging_db[0].fw_paging_size,
	DMA_BIDIRECTIONAL);

	IWL_DEBUG_FW(fwrt,
	"Paging: copied %d CSS bytes to first block\n",
	fwrt->fw_paging_db[0].fw_paging_size);

	sec_idx++;

	/*
	* copy the paging blocks to the dram
	* loop index start from 1 since that CSS block already copied to dram
	* and CSS index is 0.
	* loop stop at num_of_paging_blk since that last block is not full.
	*/
	for (idx = 1; idx < fwrt->num_of_paging_blk; idx++) {
	struct iwl_fw_paging *block = &fwrt->fw_paging_db[idx];

	memcpy(page_address(block->fw_paging_block),
	image->sec[sec_idx].data + offset,
	block->fw_paging_size);
	dma_sync_single_for_device(fwrt->trans->dev,
	block->fw_paging_phys,
	block->fw_paging_size,
	DMA_BIDIRECTIONAL);

	IWL_DEBUG_FW(fwrt,
	"Paging: copied %d paging bytes to block %d\n",
	fwrt->fw_paging_db[idx].fw_paging_size,
	idx);

	offset += fwrt->fw_paging_db[idx].fw_paging_size;
	}

	/* copy the last paging block */
	if (fwrt->num_of_pages_in_last_blk > 0) {
	struct iwl_fw_paging *block = &fwrt->fw_paging_db[idx];

	memcpy(page_address(block->fw_paging_block),
	image->sec[sec_idx].data + offset,
	FW_PAGING_SIZE * fwrt->num_of_pages_in_last_blk);
	dma_sync_single_for_device(fwrt->trans->dev,
	block->fw_paging_phys,
	block->fw_paging_size,
	DMA_BIDIRECTIONAL);

	IWL_DEBUG_FW(fwrt,
	"Paging: copied %d pages in the last block %d\n",
	fwrt->num_of_pages_in_last_blk, idx);
	}

	return 0;
	}

	static int iwl_save_fw_paging(struct iwl_fw_runtime *fwrt,
	const struct fw_img *fw)
	{
	int ret;

	ret = iwl_alloc_fw_paging_mem(fwrt, fw);
	if (ret)
	return ret;

	return iwl_fill_paging_mem(fwrt, fw);
	}

	/* send paging cmd to FW in case CPU2 has paging image */
	static int iwl_send_paging_cmd(struct iwl_fw_runtime *fwrt,
	const struct fw_img *fw)
	{
	struct iwl_fw_paging_cmd paging_cmd = {
	.flags = cpu_to_le32(PAGING_CMD_IS_SECURED \|
	PAGING_CMD_IS_ENABLED \|
	(fwrt->num_of_pages_in_last_blk <<
	PAGING_CMD_NUM_OF_PAGES_IN_LAST_GRP_POS)),
	.block_size = cpu_to_le32(BLOCK_2_EXP_SIZE),
	.block_num = cpu_to_le32(fwrt->num_of_paging_blk),
	};
	struct iwl_host_cmd hcmd = {
	.id = iwl_cmd_id(FW_PAGING_BLOCK_CMD, IWL_ALWAYS_LONG_GROUP, 0),
	.len = { sizeof(paging_cmd), },
	.data = { &paging_cmd, },
	};
	int blk_idx;

	/* loop for for all paging blocks + CSS block */
	for (blk_idx = 0; blk_idx < fwrt->num_of_paging_blk + 1; blk_idx++) {
	dma_addr_t addr = fwrt->fw_paging_db[blk_idx].fw_paging_phys;
	__le32 phy_addr;

	addr = addr >> PAGE_2_EXP_SIZE;
	phy_addr = cpu_to_le32(addr);
	paging_cmd.device_phy_addr[blk_idx] = phy_addr;
	}

	return iwl_trans_send_cmd(fwrt->trans, &hcmd);
	}

	/*
	* Send paging item cmd to FW in case CPU2 has paging image
	*/
	static int iwl_trans_get_paging_item(struct iwl_fw_runtime *fwrt)
	{
	int ret;
	struct iwl_fw_get_item_cmd fw_get_item_cmd = {
	.item_id = cpu_to_le32(IWL_FW_ITEM_ID_PAGING),
	};
	struct iwl_fw_get_item_resp *item_resp;
	struct iwl_host_cmd cmd = {
	.id = iwl_cmd_id(FW_GET_ITEM_CMD, IWL_ALWAYS_LONG_GROUP, 0),
	.flags = CMD_WANT_SKB \| CMD_SEND_IN_RFKILL,
	.data = { &fw_get_item_cmd, },
	.len = { sizeof(fw_get_item_cmd), },
	};

	ret = iwl_trans_send_cmd(fwrt->trans, &cmd);
	if (ret) {
	IWL_ERR(fwrt,
	"Paging: Failed to send FW_GET_ITEM_CMD cmd (err = %d)\n",
	ret);
	return ret;
	}

	item_resp = (void )((struct iwl_rx_packet )cmd.resp_pkt)->data;
	if (item_resp->item_id != cpu_to_le32(IWL_FW_ITEM_ID_PAGING)) {
	IWL_ERR(fwrt,
	"Paging: got wrong item in FW_GET_ITEM_CMD resp (item_id = %u)\n",
	le32_to_cpu(item_resp->item_id));
	ret = -EIO;
	goto exit;
	}

	/* Add an extra page for headers */
	fwrt->trans->paging_download_buf = kzalloc(PAGING_BLOCK_SIZE +
	FW_PAGING_SIZE,
	GFP_KERNEL);
	if (!fwrt->trans->paging_download_buf) {
	ret = -ENOMEM;
	goto exit;
	}
	fwrt->trans->paging_req_addr = le32_to_cpu(item_resp->item_val);
	fwrt->trans->paging_db = fwrt->fw_paging_db;
	IWL_DEBUG_FW(fwrt,
	"Paging: got paging request address (paging_req_addr 0x%08x)\n",
	fwrt->trans->paging_req_addr);

	exit:
	iwl_free_resp(&cmd);

	return ret;
	}

	int iwl_init_paging(struct iwl_fw_runtime *fwrt, enum iwl_ucode_type type)
	{
	const struct fw_img *fw = &fwrt->fw->img[type];
	int ret;

	if (fwrt->trans->cfg->gen2)
	return 0;

	/*
	* Configure and operate fw paging mechanism.
	* The driver configures the paging flow only once.
	* The CPU2 paging image is included in the IWL_UCODE_INIT image.
	*/
	if (!fw->paging_mem_size)
	return 0;

	/*
	* When dma is not enabled, the driver needs to copy / write
	* the downloaded / uploaded page to / from the smem.
	* This gets the location of the place were the pages are
	* stored.
	*/
	if (!is_device_dma_capable(fwrt->trans->dev)) {
	ret = iwl_trans_get_paging_item(fwrt);
	if (ret) {
	IWL_ERR(fwrt, "failed to get FW paging item\n");
	return ret;
	}
	}

	ret = iwl_save_fw_paging(fwrt, fw);
	if (ret) {
	IWL_ERR(fwrt, "failed to save the FW paging image\n");
	return ret;
	}

	ret = iwl_send_paging_cmd(fwrt, fw);
	if (ret) {
	IWL_ERR(fwrt, "failed to send the paging cmd\n");
	iwl_free_fw_paging(fwrt);
	return ret;
	}

	return 0;
	}
	IWL_EXPORT_SYMBOL(iwl_init_paging);