xref: /freebsd/sys/dev/ixl/i40e_nvm.c (revision abf774528d7e497460510b0026db85e30f054142)

/******************************************************************************

  Copyright (c) 2013-2018, Intel Corporation
  All rights reserved.

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are met:

   1. Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.

   2. 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.

   3. Neither the name of the 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.

******************************************************************************/
/*$FreeBSD$*/

#include "i40e_prototype.h"

/**
 * i40e_init_nvm - Initialize NVM function pointers
 * @hw: pointer to the HW structure
 *
 * Setup the function pointers and the NVM info structure. Should be called
 * once per NVM initialization, e.g. inside the i40e_init_shared_code().
 * Please notice that the NVM term is used here (& in all methods covered
 * in this file) as an equivalent of the FLASH part mapped into the SR.
 * We are accessing FLASH always through the Shadow RAM.
 **/
enum i40e_status_code i40e_init_nvm(struct i40e_hw *hw)
{
	struct i40e_nvm_info *nvm = &hw->nvm;
	enum i40e_status_code ret_code = I40E_SUCCESS;
	u32 fla, gens;
	u8 sr_size;

	DEBUGFUNC("i40e_init_nvm");

	/* The SR size is stored regardless of the nvm programming mode
	 * as the blank mode may be used in the factory line.
	 */
	gens = rd32(hw, I40E_GLNVM_GENS);
	sr_size = ((gens & I40E_GLNVM_GENS_SR_SIZE_MASK) >>
			   I40E_GLNVM_GENS_SR_SIZE_SHIFT);
	/* Switching to words (sr_size contains power of 2KB) */
	nvm->sr_size = BIT(sr_size) * I40E_SR_WORDS_IN_1KB;

	/* Check if we are in the normal or blank NVM programming mode */
	fla = rd32(hw, I40E_GLNVM_FLA);
	if (fla & I40E_GLNVM_FLA_LOCKED_MASK) { /* Normal programming mode */
		/* Max NVM timeout */
		nvm->timeout = I40E_MAX_NVM_TIMEOUT;
		nvm->blank_nvm_mode = FALSE;
	} else { /* Blank programming mode */
		nvm->blank_nvm_mode = TRUE;
		ret_code = I40E_ERR_NVM_BLANK_MODE;
		i40e_debug(hw, I40E_DEBUG_NVM, "NVM init error: unsupported blank mode.\n");
	}

	return ret_code;
}

/**
 * i40e_acquire_nvm - Generic request for acquiring the NVM ownership
 * @hw: pointer to the HW structure
 * @access: NVM access type (read or write)
 *
 * This function will request NVM ownership for reading
 * via the proper Admin Command.
 **/
enum i40e_status_code i40e_acquire_nvm(struct i40e_hw *hw,
				       enum i40e_aq_resource_access_type access)
{
	enum i40e_status_code ret_code = I40E_SUCCESS;
	u64 gtime, timeout;
	u64 time_left = 0;

	DEBUGFUNC("i40e_acquire_nvm");

	if (hw->nvm.blank_nvm_mode)
		goto i40e_i40e_acquire_nvm_exit;

	ret_code = i40e_aq_request_resource(hw, I40E_NVM_RESOURCE_ID, access,
					    0, &time_left, NULL);
	/* Reading the Global Device Timer */
	gtime = rd32(hw, I40E_GLVFGEN_TIMER);

	/* Store the timeout */
	hw->nvm.hw_semaphore_timeout = I40E_MS_TO_GTIME(time_left) + gtime;

	if (ret_code)
		i40e_debug(hw, I40E_DEBUG_NVM,
			   "NVM acquire type %d failed time_left=%llu ret=%d aq_err=%d\n",
			   access, (unsigned long long)time_left, ret_code,
			   hw->aq.asq_last_status);

	if (ret_code && time_left) {
		/* Poll until the current NVM owner timeouts */
		timeout = I40E_MS_TO_GTIME(I40E_MAX_NVM_TIMEOUT) + gtime;
		while ((gtime < timeout) && time_left) {
			i40e_msec_delay(10);
			gtime = rd32(hw, I40E_GLVFGEN_TIMER);
			ret_code = i40e_aq_request_resource(hw,
							I40E_NVM_RESOURCE_ID,
							access, 0, &time_left,
							NULL);
			if (ret_code == I40E_SUCCESS) {
				hw->nvm.hw_semaphore_timeout =
					    I40E_MS_TO_GTIME(time_left) + gtime;
				break;
			}
		}
		if (ret_code != I40E_SUCCESS) {
			hw->nvm.hw_semaphore_timeout = 0;
			i40e_debug(hw, I40E_DEBUG_NVM,
				   "NVM acquire timed out, wait %llu ms before trying again. status=%d aq_err=%d\n",
				   (unsigned long long)time_left, ret_code,
				   hw->aq.asq_last_status);
		}
	}

i40e_i40e_acquire_nvm_exit:
	return ret_code;
}

/**
 * i40e_release_nvm - Generic request for releasing the NVM ownership
 * @hw: pointer to the HW structure
 *
 * This function will release NVM resource via the proper Admin Command.
 **/
void i40e_release_nvm(struct i40e_hw *hw)
{
	enum i40e_status_code ret_code = I40E_SUCCESS;
	u32 total_delay = 0;

	DEBUGFUNC("i40e_release_nvm");

	if (hw->nvm.blank_nvm_mode)
		return;

	ret_code = i40e_aq_release_resource(hw, I40E_NVM_RESOURCE_ID, 0, NULL);

	/* there are some rare cases when trying to release the resource
	 * results in an admin Q timeout, so handle them correctly
	 */
	while ((ret_code == I40E_ERR_ADMIN_QUEUE_TIMEOUT) &&
	       (total_delay < hw->aq.asq_cmd_timeout)) {
			i40e_msec_delay(1);
			ret_code = i40e_aq_release_resource(hw,
						I40E_NVM_RESOURCE_ID, 0, NULL);
			total_delay++;
	}
}

/**
 * i40e_poll_sr_srctl_done_bit - Polls the GLNVM_SRCTL done bit
 * @hw: pointer to the HW structure
 *
 * Polls the SRCTL Shadow RAM register done bit.
 **/
static enum i40e_status_code i40e_poll_sr_srctl_done_bit(struct i40e_hw *hw)
{
	enum i40e_status_code ret_code = I40E_ERR_TIMEOUT;
	u32 srctl, wait_cnt;

	DEBUGFUNC("i40e_poll_sr_srctl_done_bit");

	/* Poll the I40E_GLNVM_SRCTL until the done bit is set */
	for (wait_cnt = 0; wait_cnt < I40E_SRRD_SRCTL_ATTEMPTS; wait_cnt++) {
		srctl = rd32(hw, I40E_GLNVM_SRCTL);
		if (srctl & I40E_GLNVM_SRCTL_DONE_MASK) {
			ret_code = I40E_SUCCESS;
			break;
		}
		i40e_usec_delay(5);
	}
	if (ret_code == I40E_ERR_TIMEOUT)
		i40e_debug(hw, I40E_DEBUG_NVM, "Done bit in GLNVM_SRCTL not set");
	return ret_code;
}

/**
 * i40e_read_nvm_word_srctl - Reads Shadow RAM via SRCTL register
 * @hw: pointer to the HW structure
 * @offset: offset of the Shadow RAM word to read (0x000000 - 0x001FFF)
 * @data: word read from the Shadow RAM
 *
 * Reads one 16 bit word from the Shadow RAM using the GLNVM_SRCTL register.
 **/
enum i40e_status_code i40e_read_nvm_word_srctl(struct i40e_hw *hw, u16 offset,
					       u16 *data)
{
	enum i40e_status_code ret_code = I40E_ERR_TIMEOUT;
	u32 sr_reg;

	DEBUGFUNC("i40e_read_nvm_word_srctl");

	if (offset >= hw->nvm.sr_size) {
		i40e_debug(hw, I40E_DEBUG_NVM,
			   "NVM read error: Offset %d beyond Shadow RAM limit %d\n",
			   offset, hw->nvm.sr_size);
		ret_code = I40E_ERR_PARAM;
		goto read_nvm_exit;
	}

	/* Poll the done bit first */
	ret_code = i40e_poll_sr_srctl_done_bit(hw);
	if (ret_code == I40E_SUCCESS) {
		/* Write the address and start reading */
		sr_reg = ((u32)offset << I40E_GLNVM_SRCTL_ADDR_SHIFT) |
			 BIT(I40E_GLNVM_SRCTL_START_SHIFT);
		wr32(hw, I40E_GLNVM_SRCTL, sr_reg);

		/* Poll I40E_GLNVM_SRCTL until the done bit is set */
		ret_code = i40e_poll_sr_srctl_done_bit(hw);
		if (ret_code == I40E_SUCCESS) {
			sr_reg = rd32(hw, I40E_GLNVM_SRDATA);
			*data = (u16)((sr_reg &
				       I40E_GLNVM_SRDATA_RDDATA_MASK)
				    >> I40E_GLNVM_SRDATA_RDDATA_SHIFT);
		}
	}
	if (ret_code != I40E_SUCCESS)
		i40e_debug(hw, I40E_DEBUG_NVM,
			   "NVM read error: Couldn't access Shadow RAM address: 0x%x\n",
			   offset);

read_nvm_exit:
	return ret_code;
}

/**
 * i40e_read_nvm_aq - Read Shadow RAM.
 * @hw: pointer to the HW structure.
 * @module_pointer: module pointer location in words from the NVM beginning
 * @offset: offset in words from module start
 * @words: number of words to write
 * @data: buffer with words to write to the Shadow RAM
 * @last_command: tells the AdminQ that this is the last command
 *
 * Writes a 16 bit words buffer to the Shadow RAM using the admin command.
 **/
static enum i40e_status_code i40e_read_nvm_aq(struct i40e_hw *hw,
					      u8 module_pointer, u32 offset,
					      u16 words, void *data,
					      bool last_command)
{
	enum i40e_status_code ret_code = I40E_ERR_NVM;
	struct i40e_asq_cmd_details cmd_details;

	DEBUGFUNC("i40e_read_nvm_aq");

	memset(&cmd_details, 0, sizeof(cmd_details));
	cmd_details.wb_desc = &hw->nvm_wb_desc;

	/* Here we are checking the SR limit only for the flat memory model.
	 * We cannot do it for the module-based model, as we did not acquire
	 * the NVM resource yet (we cannot get the module pointer value).
	 * Firmware will check the module-based model.
	 */
	if ((offset + words) > hw->nvm.sr_size)
		i40e_debug(hw, I40E_DEBUG_NVM,
			   "NVM write error: offset %d beyond Shadow RAM limit %d\n",
			   (offset + words), hw->nvm.sr_size);
	else if (words > I40E_SR_SECTOR_SIZE_IN_WORDS)
		/* We can write only up to 4KB (one sector), in one AQ write */
		i40e_debug(hw, I40E_DEBUG_NVM,
			   "NVM write fail error: tried to write %d words, limit is %d.\n",
			   words, I40E_SR_SECTOR_SIZE_IN_WORDS);
	else if (((offset + (words - 1)) / I40E_SR_SECTOR_SIZE_IN_WORDS)
		 != (offset / I40E_SR_SECTOR_SIZE_IN_WORDS))
		/* A single write cannot spread over two sectors */
		i40e_debug(hw, I40E_DEBUG_NVM,
			   "NVM write error: cannot spread over two sectors in a single write offset=%d words=%d\n",
			   offset, words);
	else
		ret_code = i40e_aq_read_nvm(hw, module_pointer,
					    2 * offset,  /*bytes*/
					    2 * words,   /*bytes*/
					    data, last_command, &cmd_details);

	return ret_code;
}

/**
 * i40e_read_nvm_word_aq - Reads Shadow RAM via AQ
 * @hw: pointer to the HW structure
 * @offset: offset of the Shadow RAM word to read (0x000000 - 0x001FFF)
 * @data: word read from the Shadow RAM
 *
 * Reads one 16 bit word from the Shadow RAM using the AdminQ
 **/
static enum i40e_status_code i40e_read_nvm_word_aq(struct i40e_hw *hw, u16 offset,
						   u16 *data)
{
	enum i40e_status_code ret_code = I40E_ERR_TIMEOUT;

	DEBUGFUNC("i40e_read_nvm_word_aq");

	ret_code = i40e_read_nvm_aq(hw, 0x0, offset, 1, data, TRUE);
	*data = LE16_TO_CPU(*(__le16 *)data);

	return ret_code;
}

/**
 * __i40e_read_nvm_word - Reads NVM word, assumes caller does the locking
 * @hw: pointer to the HW structure
 * @offset: offset of the Shadow RAM word to read (0x000000 - 0x001FFF)
 * @data: word read from the Shadow RAM
 *
 * Reads one 16 bit word from the Shadow RAM.
 *
 * Do not use this function except in cases where the nvm lock is already
 * taken via i40e_acquire_nvm().
 **/
enum i40e_status_code __i40e_read_nvm_word(struct i40e_hw *hw,
					   u16 offset,
					   u16 *data)
{

	if (hw->flags & I40E_HW_FLAG_AQ_SRCTL_ACCESS_ENABLE)
		return i40e_read_nvm_word_aq(hw, offset, data);

	return i40e_read_nvm_word_srctl(hw, offset, data);
}

/**
 * i40e_read_nvm_word - Reads NVM word, acquires lock if necessary
 * @hw: pointer to the HW structure
 * @offset: offset of the Shadow RAM word to read (0x000000 - 0x001FFF)
 * @data: word read from the Shadow RAM
 *
 * Reads one 16 bit word from the Shadow RAM.
 **/
enum i40e_status_code i40e_read_nvm_word(struct i40e_hw *hw, u16 offset,
					 u16 *data)
{
	enum i40e_status_code ret_code = I40E_SUCCESS;

	if (hw->flags & I40E_HW_FLAG_NVM_READ_REQUIRES_LOCK)
		ret_code = i40e_acquire_nvm(hw, I40E_RESOURCE_READ);

	if (ret_code)
		return ret_code;
	ret_code = __i40e_read_nvm_word(hw, offset, data);

	if (hw->flags & I40E_HW_FLAG_NVM_READ_REQUIRES_LOCK)
		i40e_release_nvm(hw);
	return ret_code;
}

/**
 * i40e_read_nvm_module_data - Reads NVM Buffer to specified memory location
 * @hw: Pointer to the HW structure
 * @module_ptr: Pointer to module in words with respect to NVM beginning
 * @module_offset: Offset in words from module start
 * @data_offset: Offset in words from reading data area start
 * @words_data_size: Words to read from NVM
 * @data_ptr: Pointer to memory location where resulting buffer will be stored
 **/
enum i40e_status_code
i40e_read_nvm_module_data(struct i40e_hw *hw, u8 module_ptr, u16 module_offset,
			  u16 data_offset, u16 words_data_size, u16 *data_ptr)
{
	enum i40e_status_code status;
	u16 specific_ptr = 0;
	u16 ptr_value = 0;
	u16 offset = 0;

	if (module_ptr != 0) {
		status = i40e_read_nvm_word(hw, module_ptr, &ptr_value);
		if (status != I40E_SUCCESS) {
			i40e_debug(hw, I40E_DEBUG_ALL,
				   "Reading nvm word failed.Error code: %d.\n",
				   status);
			return I40E_ERR_NVM;
		}
	}
#define I40E_NVM_INVALID_PTR_VAL 0x7FFF
#define I40E_NVM_INVALID_VAL 0xFFFF

	/* Pointer not initialized */
	if (ptr_value == I40E_NVM_INVALID_PTR_VAL ||
	    ptr_value == I40E_NVM_INVALID_VAL) {
		i40e_debug(hw, I40E_DEBUG_ALL, "Pointer not initialized.\n");
		return I40E_ERR_BAD_PTR;
	}

	/* Check whether the module is in SR mapped area or outside */
	if (ptr_value & I40E_PTR_TYPE) {
		/* Pointer points outside of the Shared RAM mapped area */
		i40e_debug(hw, I40E_DEBUG_ALL,
			   "Reading nvm data failed. Pointer points outside of the Shared RAM mapped area.\n");

		return I40E_ERR_PARAM;
	} else {
		/* Read from the Shadow RAM */

		status = i40e_read_nvm_word(hw, ptr_value + module_offset,
					    &specific_ptr);
		if (status != I40E_SUCCESS) {
			i40e_debug(hw, I40E_DEBUG_ALL,
				   "Reading nvm word failed.Error code: %d.\n",
				   status);
			return I40E_ERR_NVM;
		}

		offset = ptr_value + module_offset + specific_ptr +
			data_offset;

		status = i40e_read_nvm_buffer(hw, offset, &words_data_size,
					      data_ptr);
		if (status != I40E_SUCCESS) {
			i40e_debug(hw, I40E_DEBUG_ALL,
				   "Reading nvm buffer failed.Error code: %d.\n",
				   status);
		}
	}

	return status;
}

/**
 * i40e_read_nvm_buffer_srctl - Reads Shadow RAM buffer via SRCTL register
 * @hw: pointer to the HW structure
 * @offset: offset of the Shadow RAM word to read (0x000000 - 0x001FFF).
 * @words: (in) number of words to read; (out) number of words actually read
 * @data: words read from the Shadow RAM
 *
 * Reads 16 bit words (data buffer) from the SR using the i40e_read_nvm_srrd()
 * method. The buffer read is preceded by the NVM ownership take
 * and followed by the release.
 **/
static enum i40e_status_code i40e_read_nvm_buffer_srctl(struct i40e_hw *hw, u16 offset,
							u16 *words, u16 *data)
{
	enum i40e_status_code ret_code = I40E_SUCCESS;
	u16 index, word;

	DEBUGFUNC("i40e_read_nvm_buffer_srctl");

	/* Loop through the selected region */
	for (word = 0; word < *words; word++) {
		index = offset + word;
		ret_code = i40e_read_nvm_word_srctl(hw, index, &data[word]);
		if (ret_code != I40E_SUCCESS)
			break;
	}

	/* Update the number of words read from the Shadow RAM */
	*words = word;

	return ret_code;
}

/**
 * i40e_read_nvm_buffer_aq - Reads Shadow RAM buffer via AQ
 * @hw: pointer to the HW structure
 * @offset: offset of the Shadow RAM word to read (0x000000 - 0x001FFF).
 * @words: (in) number of words to read; (out) number of words actually read
 * @data: words read from the Shadow RAM
 *
 * Reads 16 bit words (data buffer) from the SR using the i40e_read_nvm_aq()
 * method. The buffer read is preceded by the NVM ownership take
 * and followed by the release.
 **/
static enum i40e_status_code i40e_read_nvm_buffer_aq(struct i40e_hw *hw, u16 offset,
						     u16 *words, u16 *data)
{
	enum i40e_status_code ret_code;
	u16 read_size = *words;
	bool last_cmd = FALSE;
	u16 words_read = 0;
	u16 i = 0;

	DEBUGFUNC("i40e_read_nvm_buffer_aq");

	do {
		/* Calculate number of bytes we should read in this step.
		 * FVL AQ do not allow to read more than one page at a time or
		 * to cross page boundaries.
		 */
		if (offset % I40E_SR_SECTOR_SIZE_IN_WORDS)
			read_size = min(*words,
					(u16)(I40E_SR_SECTOR_SIZE_IN_WORDS -
				      (offset % I40E_SR_SECTOR_SIZE_IN_WORDS)));
		else
			read_size = min((*words - words_read),
					I40E_SR_SECTOR_SIZE_IN_WORDS);

		/* Check if this is last command, if so set proper flag */
		if ((words_read + read_size) >= *words)
			last_cmd = TRUE;

		ret_code = i40e_read_nvm_aq(hw, 0x0, offset, read_size,
					    data + words_read, last_cmd);
		if (ret_code != I40E_SUCCESS)
			goto read_nvm_buffer_aq_exit;

		/* Increment counter for words already read and move offset to
		 * new read location
		 */
		words_read += read_size;
		offset += read_size;
	} while (words_read < *words);

	for (i = 0; i < *words; i++)
		data[i] = LE16_TO_CPU(((__le16 *)data)[i]);

read_nvm_buffer_aq_exit:
	*words = words_read;
	return ret_code;
}

/**
 * __i40e_read_nvm_buffer - Reads NVM buffer, caller must acquire lock
 * @hw: pointer to the HW structure
 * @offset: offset of the Shadow RAM word to read (0x000000 - 0x001FFF).
 * @words: (in) number of words to read; (out) number of words actually read
 * @data: words read from the Shadow RAM
 *
 * Reads 16 bit words (data buffer) from the SR using the i40e_read_nvm_srrd()
 * method.
 **/
enum i40e_status_code __i40e_read_nvm_buffer(struct i40e_hw *hw,
					     u16 offset,
					     u16 *words, u16 *data)
{
	if (hw->flags & I40E_HW_FLAG_AQ_SRCTL_ACCESS_ENABLE)
		return i40e_read_nvm_buffer_aq(hw, offset, words, data);

	return i40e_read_nvm_buffer_srctl(hw, offset, words, data);
}

/**
 * i40e_read_nvm_buffer - Reads Shadow RAM buffer and acquire lock if necessary
 * @hw: pointer to the HW structure
 * @offset: offset of the Shadow RAM word to read (0x000000 - 0x001FFF).
 * @words: (in) number of words to read; (out) number of words actually read
 * @data: words read from the Shadow RAM
 *
 * Reads 16 bit words (data buffer) from the SR using the i40e_read_nvm_srrd()
 * method. The buffer read is preceded by the NVM ownership take
 * and followed by the release.
 **/
enum i40e_status_code i40e_read_nvm_buffer(struct i40e_hw *hw, u16 offset,
					   u16 *words, u16 *data)
{
	enum i40e_status_code ret_code = I40E_SUCCESS;

	if (hw->flags & I40E_HW_FLAG_AQ_SRCTL_ACCESS_ENABLE) {
		ret_code = i40e_acquire_nvm(hw, I40E_RESOURCE_READ);
		if (!ret_code) {
			ret_code = i40e_read_nvm_buffer_aq(hw, offset, words,
							 data);
			i40e_release_nvm(hw);
		}
	} else {
		ret_code = i40e_read_nvm_buffer_srctl(hw, offset, words, data);
	}

	return ret_code;
}

/**
 * i40e_write_nvm_aq - Writes Shadow RAM.
 * @hw: pointer to the HW structure.
 * @module_pointer: module pointer location in words from the NVM beginning
 * @offset: offset in words from module start
 * @words: number of words to write
 * @data: buffer with words to write to the Shadow RAM
 * @last_command: tells the AdminQ that this is the last command
 *
 * Writes a 16 bit words buffer to the Shadow RAM using the admin command.
 **/
enum i40e_status_code i40e_write_nvm_aq(struct i40e_hw *hw, u8 module_pointer,
					u32 offset, u16 words, void *data,
					bool last_command)
{
	enum i40e_status_code ret_code = I40E_ERR_NVM;
	struct i40e_asq_cmd_details cmd_details;

	DEBUGFUNC("i40e_write_nvm_aq");

	memset(&cmd_details, 0, sizeof(cmd_details));
	cmd_details.wb_desc = &hw->nvm_wb_desc;

	/* Here we are checking the SR limit only for the flat memory model.
	 * We cannot do it for the module-based model, as we did not acquire
	 * the NVM resource yet (we cannot get the module pointer value).
	 * Firmware will check the module-based model.
	 */
	if ((offset + words) > hw->nvm.sr_size)
		DEBUGOUT("NVM write error: offset beyond Shadow RAM limit.\n");
	else if (words > I40E_SR_SECTOR_SIZE_IN_WORDS)
		/* We can write only up to 4KB (one sector), in one AQ write */
		DEBUGOUT("NVM write fail error: cannot write more than 4KB in a single write.\n");
	else if (((offset + (words - 1)) / I40E_SR_SECTOR_SIZE_IN_WORDS)
		 != (offset / I40E_SR_SECTOR_SIZE_IN_WORDS))
		/* A single write cannot spread over two sectors */
		DEBUGOUT("NVM write error: cannot spread over two sectors in a single write.\n");
	else
		ret_code = i40e_aq_update_nvm(hw, module_pointer,
					      2 * offset,  /*bytes*/
					      2 * words,   /*bytes*/
					      data, last_command, 0,
					      &cmd_details);

	return ret_code;
}

/**
 * __i40e_write_nvm_word - Writes Shadow RAM word
 * @hw: pointer to the HW structure
 * @offset: offset of the Shadow RAM word to write
 * @data: word to write to the Shadow RAM
 *
 * Writes a 16 bit word to the SR using the i40e_write_nvm_aq() method.
 * NVM ownership have to be acquired and released (on ARQ completion event
 * reception) by caller. To commit SR to NVM update checksum function
 * should be called.
 **/
enum i40e_status_code __i40e_write_nvm_word(struct i40e_hw *hw, u32 offset,
					    void *data)
{
	DEBUGFUNC("i40e_write_nvm_word");

	*((__le16 *)data) = CPU_TO_LE16(*((u16 *)data));

	/* Value 0x00 below means that we treat SR as a flat mem */
	return i40e_write_nvm_aq(hw, 0x00, offset, 1, data, FALSE);
}

/**
 * __i40e_write_nvm_buffer - Writes Shadow RAM buffer
 * @hw: pointer to the HW structure
 * @module_pointer: module pointer location in words from the NVM beginning
 * @offset: offset of the Shadow RAM buffer to write
 * @words: number of words to write
 * @data: words to write to the Shadow RAM
 *
 * Writes a 16 bit words buffer to the Shadow RAM using the admin command.
 * NVM ownership must be acquired before calling this function and released
 * on ARQ completion event reception by caller. To commit SR to NVM update
 * checksum function should be called.
 **/
enum i40e_status_code __i40e_write_nvm_buffer(struct i40e_hw *hw,
					      u8 module_pointer, u32 offset,
					      u16 words, void *data)
{
	__le16 *le_word_ptr = (__le16 *)data;
	u16 *word_ptr = (u16 *)data;
	u32 i = 0;

	DEBUGFUNC("i40e_write_nvm_buffer");

	for (i = 0; i < words; i++)
		le_word_ptr[i] = CPU_TO_LE16(word_ptr[i]);

	/* Here we will only write one buffer as the size of the modules
	 * mirrored in the Shadow RAM is always less than 4K.
	 */
	return i40e_write_nvm_aq(hw, module_pointer, offset, words,
				 data, FALSE);
}

/**
 * i40e_calc_nvm_checksum - Calculates and returns the checksum
 * @hw: pointer to hardware structure
 * @checksum: pointer to the checksum
 *
 * This function calculates SW Checksum that covers the whole 64kB shadow RAM
 * except the VPD and PCIe ALT Auto-load modules. The structure and size of VPD
 * is customer specific and unknown. Therefore, this function skips all maximum
 * possible size of VPD (1kB).
 **/
enum i40e_status_code i40e_calc_nvm_checksum(struct i40e_hw *hw, u16 *checksum)
{
	enum i40e_status_code ret_code = I40E_SUCCESS;
	struct i40e_virt_mem vmem;
	u16 pcie_alt_module = 0;
	u16 checksum_local = 0;
	u16 vpd_module = 0;
	u16 *data;
	u16 i = 0;

	DEBUGFUNC("i40e_calc_nvm_checksum");

	ret_code = i40e_allocate_virt_mem(hw, &vmem,
				    I40E_SR_SECTOR_SIZE_IN_WORDS * sizeof(u16));
	if (ret_code)
		goto i40e_calc_nvm_checksum_exit;
	data = (u16 *)vmem.va;

	/* read pointer to VPD area */
	ret_code = __i40e_read_nvm_word(hw, I40E_SR_VPD_PTR, &vpd_module);
	if (ret_code != I40E_SUCCESS) {
		ret_code = I40E_ERR_NVM_CHECKSUM;
		goto i40e_calc_nvm_checksum_exit;
	}

	/* read pointer to PCIe Alt Auto-load module */
	ret_code = __i40e_read_nvm_word(hw, I40E_SR_PCIE_ALT_AUTO_LOAD_PTR,
					&pcie_alt_module);
	if (ret_code != I40E_SUCCESS) {
		ret_code = I40E_ERR_NVM_CHECKSUM;
		goto i40e_calc_nvm_checksum_exit;
	}

	/* Calculate SW checksum that covers the whole 64kB shadow RAM
	 * except the VPD and PCIe ALT Auto-load modules
	 */
	for (i = 0; i < hw->nvm.sr_size; i++) {
		/* Read SR page */
		if ((i % I40E_SR_SECTOR_SIZE_IN_WORDS) == 0) {
			u16 words = I40E_SR_SECTOR_SIZE_IN_WORDS;

			ret_code = __i40e_read_nvm_buffer(hw, i, &words, data);
			if (ret_code != I40E_SUCCESS) {
				ret_code = I40E_ERR_NVM_CHECKSUM;
				goto i40e_calc_nvm_checksum_exit;
			}
		}

		/* Skip Checksum word */
		if (i == I40E_SR_SW_CHECKSUM_WORD)
			continue;
		/* Skip VPD module (convert byte size to word count) */
		if ((i >= (u32)vpd_module) &&
		    (i < ((u32)vpd_module +
		     (I40E_SR_VPD_MODULE_MAX_SIZE / 2)))) {
			continue;
		}
		/* Skip PCIe ALT module (convert byte size to word count) */
		if ((i >= (u32)pcie_alt_module) &&
		    (i < ((u32)pcie_alt_module +
		     (I40E_SR_PCIE_ALT_MODULE_MAX_SIZE / 2)))) {
			continue;
		}

		checksum_local += data[i % I40E_SR_SECTOR_SIZE_IN_WORDS];
	}

	*checksum = (u16)I40E_SR_SW_CHECKSUM_BASE - checksum_local;

i40e_calc_nvm_checksum_exit:
	i40e_free_virt_mem(hw, &vmem);
	return ret_code;
}

/**
 * i40e_update_nvm_checksum - Updates the NVM checksum
 * @hw: pointer to hardware structure
 *
 * NVM ownership must be acquired before calling this function and released
 * on ARQ completion event reception by caller.
 * This function will commit SR to NVM.
 **/
enum i40e_status_code i40e_update_nvm_checksum(struct i40e_hw *hw)
{
	enum i40e_status_code ret_code = I40E_SUCCESS;
	u16 checksum;
	__le16 le_sum;

	DEBUGFUNC("i40e_update_nvm_checksum");

	ret_code = i40e_calc_nvm_checksum(hw, &checksum);
	if (ret_code == I40E_SUCCESS) {
		le_sum = CPU_TO_LE16(checksum);
		ret_code = i40e_write_nvm_aq(hw, 0x00, I40E_SR_SW_CHECKSUM_WORD,
					     1, &le_sum, TRUE);
	}

	return ret_code;
}

/**
 * i40e_validate_nvm_checksum - Validate EEPROM checksum
 * @hw: pointer to hardware structure
 * @checksum: calculated checksum
 *
 * Performs checksum calculation and validates the NVM SW checksum. If the
 * caller does not need checksum, the value can be NULL.
 **/
enum i40e_status_code i40e_validate_nvm_checksum(struct i40e_hw *hw,
						 u16 *checksum)
{
	enum i40e_status_code ret_code = I40E_SUCCESS;
	u16 checksum_sr = 0;
	u16 checksum_local = 0;

	DEBUGFUNC("i40e_validate_nvm_checksum");

	/* We must acquire the NVM lock in order to correctly synchronize the
	 * NVM accesses across multiple PFs. Without doing so it is possible
	 * for one of the PFs to read invalid data potentially indicating that
	 * the checksum is invalid.
	 */
	ret_code = i40e_acquire_nvm(hw, I40E_RESOURCE_READ);
	if (ret_code)
		return ret_code;
	ret_code = i40e_calc_nvm_checksum(hw, &checksum_local);
	__i40e_read_nvm_word(hw, I40E_SR_SW_CHECKSUM_WORD, &checksum_sr);
	i40e_release_nvm(hw);
	if (ret_code)
		return ret_code;

	/* Verify read checksum from EEPROM is the same as
	 * calculated checksum
	 */
	if (checksum_local != checksum_sr)
		ret_code = I40E_ERR_NVM_CHECKSUM;

	/* If the user cares, return the calculated checksum */
	if (checksum)
		*checksum = checksum_local;

	return ret_code;
}

static enum i40e_status_code i40e_nvmupd_state_init(struct i40e_hw *hw,
						    struct i40e_nvm_access *cmd,
						    u8 *bytes, int *perrno);
static enum i40e_status_code i40e_nvmupd_state_reading(struct i40e_hw *hw,
						    struct i40e_nvm_access *cmd,
						    u8 *bytes, int *perrno);
static enum i40e_status_code i40e_nvmupd_state_writing(struct i40e_hw *hw,
						    struct i40e_nvm_access *cmd,
						    u8 *bytes, int *perrno);
static enum i40e_nvmupd_cmd i40e_nvmupd_validate_command(struct i40e_hw *hw,
						    struct i40e_nvm_access *cmd,
						    int *perrno);
static enum i40e_status_code i40e_nvmupd_nvm_erase(struct i40e_hw *hw,
						   struct i40e_nvm_access *cmd,
						   int *perrno);
static enum i40e_status_code i40e_nvmupd_nvm_write(struct i40e_hw *hw,
						   struct i40e_nvm_access *cmd,
						   u8 *bytes, int *perrno);
static enum i40e_status_code i40e_nvmupd_nvm_read(struct i40e_hw *hw,
						  struct i40e_nvm_access *cmd,
						  u8 *bytes, int *perrno);
static enum i40e_status_code i40e_nvmupd_exec_aq(struct i40e_hw *hw,
						 struct i40e_nvm_access *cmd,
						 u8 *bytes, int *perrno);
static enum i40e_status_code i40e_nvmupd_get_aq_result(struct i40e_hw *hw,
						    struct i40e_nvm_access *cmd,
						    u8 *bytes, int *perrno);
static enum i40e_status_code i40e_nvmupd_get_aq_event(struct i40e_hw *hw,
						    struct i40e_nvm_access *cmd,
						    u8 *bytes, int *perrno);
static INLINE u8 i40e_nvmupd_get_module(u32 val)
{
	return (u8)(val & I40E_NVM_MOD_PNT_MASK);
}
static INLINE u8 i40e_nvmupd_get_transaction(u32 val)
{
	return (u8)((val & I40E_NVM_TRANS_MASK) >> I40E_NVM_TRANS_SHIFT);
}

static INLINE u8 i40e_nvmupd_get_preservation_flags(u32 val)
{
	return (u8)((val & I40E_NVM_PRESERVATION_FLAGS_MASK) >>
		    I40E_NVM_PRESERVATION_FLAGS_SHIFT);
}

static const char *i40e_nvm_update_state_str[] = {
	"I40E_NVMUPD_INVALID",
	"I40E_NVMUPD_READ_CON",
	"I40E_NVMUPD_READ_SNT",
	"I40E_NVMUPD_READ_LCB",
	"I40E_NVMUPD_READ_SA",
	"I40E_NVMUPD_WRITE_ERA",
	"I40E_NVMUPD_WRITE_CON",
	"I40E_NVMUPD_WRITE_SNT",
	"I40E_NVMUPD_WRITE_LCB",
	"I40E_NVMUPD_WRITE_SA",
	"I40E_NVMUPD_CSUM_CON",
	"I40E_NVMUPD_CSUM_SA",
	"I40E_NVMUPD_CSUM_LCB",
	"I40E_NVMUPD_STATUS",
	"I40E_NVMUPD_EXEC_AQ",
	"I40E_NVMUPD_GET_AQ_RESULT",
	"I40E_NVMUPD_GET_AQ_EVENT",
	"I40E_NVMUPD_GET_FEATURES",
};

/**
 * i40e_nvmupd_command - Process an NVM update command
 * @hw: pointer to hardware structure
 * @cmd: pointer to nvm update command
 * @bytes: pointer to the data buffer
 * @perrno: pointer to return error code
 *
 * Dispatches command depending on what update state is current
 **/
enum i40e_status_code i40e_nvmupd_command(struct i40e_hw *hw,
					  struct i40e_nvm_access *cmd,
					  u8 *bytes, int *perrno)
{
	enum i40e_status_code status;
	enum i40e_nvmupd_cmd upd_cmd;

	DEBUGFUNC("i40e_nvmupd_command");

	/* assume success */
	*perrno = 0;

	/* early check for status command and debug msgs */
	upd_cmd = i40e_nvmupd_validate_command(hw, cmd, perrno);

	i40e_debug(hw, I40E_DEBUG_NVM, "%s state %d nvm_release_on_hold %d opc 0x%04x cmd 0x%08x config 0x%08x offset 0x%08x data_size 0x%08x\n",
		   i40e_nvm_update_state_str[upd_cmd],
		   hw->nvmupd_state,
		   hw->nvm_release_on_done, hw->nvm_wait_opcode,
		   cmd->command, cmd->config, cmd->offset, cmd->data_size);

	if (upd_cmd == I40E_NVMUPD_INVALID) {
		*perrno = -EFAULT;
		i40e_debug(hw, I40E_DEBUG_NVM,
			   "i40e_nvmupd_validate_command returns %d errno %d\n",
			   upd_cmd, *perrno);
	}

	/* a status request returns immediately rather than
	 * going into the state machine
	 */
	if (upd_cmd == I40E_NVMUPD_STATUS) {
		if (!cmd->data_size) {
			*perrno = -EFAULT;
			return I40E_ERR_BUF_TOO_SHORT;
		}

		bytes[0] = hw->nvmupd_state;

		if (cmd->data_size >= 4) {
			bytes[1] = 0;
			*((u16 *)&bytes[2]) = hw->nvm_wait_opcode;
		}

		/* Clear error status on read */
		if (hw->nvmupd_state == I40E_NVMUPD_STATE_ERROR)
			hw->nvmupd_state = I40E_NVMUPD_STATE_INIT;

		return I40E_SUCCESS;
	}

	/*
	 * A supported features request returns immediately
	 * rather than going into state machine
	 */
	if (upd_cmd == I40E_NVMUPD_FEATURES) {
		if (cmd->data_size < hw->nvmupd_features.size) {
			*perrno = -EFAULT;
			return I40E_ERR_BUF_TOO_SHORT;
		}

		/*
		 * If buffer is bigger than i40e_nvmupd_features structure,
		 * make sure the trailing bytes are set to 0x0.
		 */
		if (cmd->data_size > hw->nvmupd_features.size)
			i40e_memset(bytes + hw->nvmupd_features.size, 0x0,
				    cmd->data_size - hw->nvmupd_features.size,
				    I40E_NONDMA_MEM);

		i40e_memcpy(bytes, &hw->nvmupd_features,
			    hw->nvmupd_features.size, I40E_NONDMA_MEM);

		return I40E_SUCCESS;
	}

	/* Clear status even it is not read and log */
	if (hw->nvmupd_state == I40E_NVMUPD_STATE_ERROR) {
		i40e_debug(hw, I40E_DEBUG_NVM,
			   "Clearing I40E_NVMUPD_STATE_ERROR state without reading\n");
		hw->nvmupd_state = I40E_NVMUPD_STATE_INIT;
	}

	/* Acquire lock to prevent race condition where adminq_task
	 * can execute after i40e_nvmupd_nvm_read/write but before state
	 * variables (nvm_wait_opcode, nvm_release_on_done) are updated.
	 *
	 * During NVMUpdate, it is observed that lock could be held for
	 * ~5ms for most commands. However lock is held for ~60ms for
	 * NVMUPD_CSUM_LCB command.
	 */
	i40e_acquire_spinlock(&hw->aq.arq_spinlock);
	switch (hw->nvmupd_state) {
	case I40E_NVMUPD_STATE_INIT:
		status = i40e_nvmupd_state_init(hw, cmd, bytes, perrno);
		break;

	case I40E_NVMUPD_STATE_READING:
		status = i40e_nvmupd_state_reading(hw, cmd, bytes, perrno);
		break;

	case I40E_NVMUPD_STATE_WRITING:
		status = i40e_nvmupd_state_writing(hw, cmd, bytes, perrno);
		break;

	case I40E_NVMUPD_STATE_INIT_WAIT:
	case I40E_NVMUPD_STATE_WRITE_WAIT:
		/* if we need to stop waiting for an event, clear
		 * the wait info and return before doing anything else
		 */
		if (cmd->offset == 0xffff) {
			i40e_nvmupd_clear_wait_state(hw);
			status = I40E_SUCCESS;
			break;
		}

		status = I40E_ERR_NOT_READY;
		*perrno = -EBUSY;
		break;

	default:
		/* invalid state, should never happen */
		i40e_debug(hw, I40E_DEBUG_NVM,
			   "NVMUPD: no such state %d\n", hw->nvmupd_state);
		status = I40E_NOT_SUPPORTED;
		*perrno = -ESRCH;
		break;
	}

	i40e_release_spinlock(&hw->aq.arq_spinlock);
	return status;
}

/**
 * i40e_nvmupd_state_init - Handle NVM update state Init
 * @hw: pointer to hardware structure
 * @cmd: pointer to nvm update command buffer
 * @bytes: pointer to the data buffer
 * @perrno: pointer to return error code
 *
 * Process legitimate commands of the Init state and conditionally set next
 * state. Reject all other commands.
 **/
static enum i40e_status_code i40e_nvmupd_state_init(struct i40e_hw *hw,
						    struct i40e_nvm_access *cmd,
						    u8 *bytes, int *perrno)
{
	enum i40e_status_code status = I40E_SUCCESS;
	enum i40e_nvmupd_cmd upd_cmd;

	DEBUGFUNC("i40e_nvmupd_state_init");

	upd_cmd = i40e_nvmupd_validate_command(hw, cmd, perrno);

	switch (upd_cmd) {
	case I40E_NVMUPD_READ_SA:
		status = i40e_acquire_nvm(hw, I40E_RESOURCE_READ);
		if (status) {
			*perrno = i40e_aq_rc_to_posix(status,
						     hw->aq.asq_last_status);
		} else {
			status = i40e_nvmupd_nvm_read(hw, cmd, bytes, perrno);
			i40e_release_nvm(hw);
		}
		break;

	case I40E_NVMUPD_READ_SNT:
		status = i40e_acquire_nvm(hw, I40E_RESOURCE_READ);
		if (status) {
			*perrno = i40e_aq_rc_to_posix(status,
						     hw->aq.asq_last_status);
		} else {
			status = i40e_nvmupd_nvm_read(hw, cmd, bytes, perrno);
			if (status)
				i40e_release_nvm(hw);
			else
				hw->nvmupd_state = I40E_NVMUPD_STATE_READING;
		}
		break;

	case I40E_NVMUPD_WRITE_ERA:
		status = i40e_acquire_nvm(hw, I40E_RESOURCE_WRITE);
		if (status) {
			*perrno = i40e_aq_rc_to_posix(status,
						     hw->aq.asq_last_status);
		} else {
			status = i40e_nvmupd_nvm_erase(hw, cmd, perrno);
			if (status) {
				i40e_release_nvm(hw);
			} else {
				hw->nvm_release_on_done = TRUE;
				hw->nvm_wait_opcode = i40e_aqc_opc_nvm_erase;
				hw->nvmupd_state = I40E_NVMUPD_STATE_INIT_WAIT;
			}
		}
		break;

	case I40E_NVMUPD_WRITE_SA:
		status = i40e_acquire_nvm(hw, I40E_RESOURCE_WRITE);
		if (status) {
			*perrno = i40e_aq_rc_to_posix(status,
						     hw->aq.asq_last_status);
		} else {
			status = i40e_nvmupd_nvm_write(hw, cmd, bytes, perrno);
			if (status) {
				i40e_release_nvm(hw);
			} else {
				hw->nvm_release_on_done = TRUE;
				hw->nvm_wait_opcode = i40e_aqc_opc_nvm_update;
				hw->nvmupd_state = I40E_NVMUPD_STATE_INIT_WAIT;
			}
		}
		break;

	case I40E_NVMUPD_WRITE_SNT:
		status = i40e_acquire_nvm(hw, I40E_RESOURCE_WRITE);
		if (status) {
			*perrno = i40e_aq_rc_to_posix(status,
						     hw->aq.asq_last_status);
		} else {
			status = i40e_nvmupd_nvm_write(hw, cmd, bytes, perrno);
			if (status) {
				i40e_release_nvm(hw);
			} else {
				hw->nvm_wait_opcode = i40e_aqc_opc_nvm_update;
				hw->nvmupd_state = I40E_NVMUPD_STATE_WRITE_WAIT;
			}
		}
		break;

	case I40E_NVMUPD_CSUM_SA:
		status = i40e_acquire_nvm(hw, I40E_RESOURCE_WRITE);
		if (status) {
			*perrno = i40e_aq_rc_to_posix(status,
						     hw->aq.asq_last_status);
		} else {
			status = i40e_update_nvm_checksum(hw);
			if (status) {
				*perrno = hw->aq.asq_last_status ?
				   i40e_aq_rc_to_posix(status,
						       hw->aq.asq_last_status) :
				   -EIO;
				i40e_release_nvm(hw);
			} else {
				hw->nvm_release_on_done = TRUE;
				hw->nvm_wait_opcode = i40e_aqc_opc_nvm_update;
				hw->nvmupd_state = I40E_NVMUPD_STATE_INIT_WAIT;
			}
		}
		break;

	case I40E_NVMUPD_EXEC_AQ:
		status = i40e_nvmupd_exec_aq(hw, cmd, bytes, perrno);
		break;

	case I40E_NVMUPD_GET_AQ_RESULT:
		status = i40e_nvmupd_get_aq_result(hw, cmd, bytes, perrno);
		break;

	case I40E_NVMUPD_GET_AQ_EVENT:
		status = i40e_nvmupd_get_aq_event(hw, cmd, bytes, perrno);
		break;

	default:
		i40e_debug(hw, I40E_DEBUG_NVM,
			   "NVMUPD: bad cmd %s in init state\n",
			   i40e_nvm_update_state_str[upd_cmd]);
		status = I40E_ERR_NVM;
		*perrno = -ESRCH;
		break;
	}
	return status;
}

/**
 * i40e_nvmupd_state_reading - Handle NVM update state Reading
 * @hw: pointer to hardware structure
 * @cmd: pointer to nvm update command buffer
 * @bytes: pointer to the data buffer
 * @perrno: pointer to return error code
 *
 * NVM ownership is already held.  Process legitimate commands and set any
 * change in state; reject all other commands.
 **/
static enum i40e_status_code i40e_nvmupd_state_reading(struct i40e_hw *hw,
						    struct i40e_nvm_access *cmd,
						    u8 *bytes, int *perrno)
{
	enum i40e_status_code status = I40E_SUCCESS;
	enum i40e_nvmupd_cmd upd_cmd;

	DEBUGFUNC("i40e_nvmupd_state_reading");

	upd_cmd = i40e_nvmupd_validate_command(hw, cmd, perrno);

	switch (upd_cmd) {
	case I40E_NVMUPD_READ_SA:
	case I40E_NVMUPD_READ_CON:
		status = i40e_nvmupd_nvm_read(hw, cmd, bytes, perrno);
		break;

	case I40E_NVMUPD_READ_LCB:
		status = i40e_nvmupd_nvm_read(hw, cmd, bytes, perrno);
		i40e_release_nvm(hw);
		hw->nvmupd_state = I40E_NVMUPD_STATE_INIT;
		break;

	default:
		i40e_debug(hw, I40E_DEBUG_NVM,
			   "NVMUPD: bad cmd %s in reading state.\n",
			   i40e_nvm_update_state_str[upd_cmd]);
		status = I40E_NOT_SUPPORTED;
		*perrno = -ESRCH;
		break;
	}
	return status;
}

/**
 * i40e_nvmupd_state_writing - Handle NVM update state Writing
 * @hw: pointer to hardware structure
 * @cmd: pointer to nvm update command buffer
 * @bytes: pointer to the data buffer
 * @perrno: pointer to return error code
 *
 * NVM ownership is already held.  Process legitimate commands and set any
 * change in state; reject all other commands
 **/
static enum i40e_status_code i40e_nvmupd_state_writing(struct i40e_hw *hw,
						    struct i40e_nvm_access *cmd,
						    u8 *bytes, int *perrno)
{
	enum i40e_status_code status = I40E_SUCCESS;
	enum i40e_nvmupd_cmd upd_cmd;
	bool retry_attempt = FALSE;

	DEBUGFUNC("i40e_nvmupd_state_writing");

	upd_cmd = i40e_nvmupd_validate_command(hw, cmd, perrno);

retry:
	switch (upd_cmd) {
	case I40E_NVMUPD_WRITE_CON:
		status = i40e_nvmupd_nvm_write(hw, cmd, bytes, perrno);
		if (!status) {
			hw->nvm_wait_opcode = i40e_aqc_opc_nvm_update;
			hw->nvmupd_state = I40E_NVMUPD_STATE_WRITE_WAIT;
		}
		break;

	case I40E_NVMUPD_WRITE_LCB:
		status = i40e_nvmupd_nvm_write(hw, cmd, bytes, perrno);
		if (status) {
			*perrno = hw->aq.asq_last_status ?
				   i40e_aq_rc_to_posix(status,
						       hw->aq.asq_last_status) :
				   -EIO;
			hw->nvmupd_state = I40E_NVMUPD_STATE_INIT;
		} else {
			hw->nvm_release_on_done = TRUE;
			hw->nvm_wait_opcode = i40e_aqc_opc_nvm_update;
			hw->nvmupd_state = I40E_NVMUPD_STATE_INIT_WAIT;
		}
		break;

	case I40E_NVMUPD_CSUM_CON:
		/* Assumes the caller has acquired the nvm */
		status = i40e_update_nvm_checksum(hw);
		if (status) {
			*perrno = hw->aq.asq_last_status ?
				   i40e_aq_rc_to_posix(status,
						       hw->aq.asq_last_status) :
				   -EIO;
			hw->nvmupd_state = I40E_NVMUPD_STATE_INIT;
		} else {
			hw->nvm_wait_opcode = i40e_aqc_opc_nvm_update;
			hw->nvmupd_state = I40E_NVMUPD_STATE_WRITE_WAIT;
		}
		break;

	case I40E_NVMUPD_CSUM_LCB:
		/* Assumes the caller has acquired the nvm */
		status = i40e_update_nvm_checksum(hw);
		if (status) {
			*perrno = hw->aq.asq_last_status ?
				   i40e_aq_rc_to_posix(status,
						       hw->aq.asq_last_status) :
				   -EIO;
			hw->nvmupd_state = I40E_NVMUPD_STATE_INIT;
		} else {
			hw->nvm_release_on_done = TRUE;
			hw->nvm_wait_opcode = i40e_aqc_opc_nvm_update;
			hw->nvmupd_state = I40E_NVMUPD_STATE_INIT_WAIT;
		}
		break;

	default:
		i40e_debug(hw, I40E_DEBUG_NVM,
			   "NVMUPD: bad cmd %s in writing state.\n",
			   i40e_nvm_update_state_str[upd_cmd]);
		status = I40E_NOT_SUPPORTED;
		*perrno = -ESRCH;
		break;
	}

	/* In some circumstances, a multi-write transaction takes longer
	 * than the default 3 minute timeout on the write semaphore.  If
	 * the write failed with an EBUSY status, this is likely the problem,
	 * so here we try to reacquire the semaphore then retry the write.
	 * We only do one retry, then give up.
	 */
	if (status && (hw->aq.asq_last_status == I40E_AQ_RC_EBUSY) &&
	    !retry_attempt) {
		enum i40e_status_code old_status = status;
		u32 old_asq_status = hw->aq.asq_last_status;
		u32 gtime;

		gtime = rd32(hw, I40E_GLVFGEN_TIMER);
		if (gtime >= hw->nvm.hw_semaphore_timeout) {
			i40e_debug(hw, I40E_DEBUG_ALL,
				   "NVMUPD: write semaphore expired (%d >= %lld), retrying\n",
				   gtime, hw->nvm.hw_semaphore_timeout);
			i40e_release_nvm(hw);
			status = i40e_acquire_nvm(hw, I40E_RESOURCE_WRITE);
			if (status) {
				i40e_debug(hw, I40E_DEBUG_ALL,
					   "NVMUPD: write semaphore reacquire failed aq_err = %d\n",
					   hw->aq.asq_last_status);
				status = old_status;
				hw->aq.asq_last_status = old_asq_status;
			} else {
				retry_attempt = TRUE;
				goto retry;
			}
		}
	}

	return status;
}

/**
 * i40e_nvmupd_clear_wait_state - clear wait state on hw
 * @hw: pointer to the hardware structure
 **/
void i40e_nvmupd_clear_wait_state(struct i40e_hw *hw)
{
	i40e_debug(hw, I40E_DEBUG_NVM,
		   "NVMUPD: clearing wait on opcode 0x%04x\n",
		   hw->nvm_wait_opcode);

	if (hw->nvm_release_on_done) {
		i40e_release_nvm(hw);
		hw->nvm_release_on_done = FALSE;
	}
	hw->nvm_wait_opcode = 0;

	if (hw->aq.arq_last_status) {
		hw->nvmupd_state = I40E_NVMUPD_STATE_ERROR;
		return;
	}

	switch (hw->nvmupd_state) {
	case I40E_NVMUPD_STATE_INIT_WAIT:
		hw->nvmupd_state = I40E_NVMUPD_STATE_INIT;
		break;

	case I40E_NVMUPD_STATE_WRITE_WAIT:
		hw->nvmupd_state = I40E_NVMUPD_STATE_WRITING;
		break;

	default:
		break;
	}
}

/**
 * i40e_nvmupd_check_wait_event - handle NVM update operation events
 * @hw: pointer to the hardware structure
 * @opcode: the event that just happened
 * @desc: AdminQ descriptor
 **/
void i40e_nvmupd_check_wait_event(struct i40e_hw *hw, u16 opcode,
				  struct i40e_aq_desc *desc)
{
	u32 aq_desc_len = sizeof(struct i40e_aq_desc);

	if (opcode == hw->nvm_wait_opcode) {
		i40e_memcpy(&hw->nvm_aq_event_desc, desc,
			    aq_desc_len, I40E_NONDMA_TO_NONDMA);
		i40e_nvmupd_clear_wait_state(hw);
	}
}

/**
 * i40e_nvmupd_validate_command - Validate given command
 * @hw: pointer to hardware structure
 * @cmd: pointer to nvm update command buffer
 * @perrno: pointer to return error code
 *
 * Return one of the valid command types or I40E_NVMUPD_INVALID
 **/
static enum i40e_nvmupd_cmd i40e_nvmupd_validate_command(struct i40e_hw *hw,
						    struct i40e_nvm_access *cmd,
						    int *perrno)
{
	enum i40e_nvmupd_cmd upd_cmd;
	u8 module, transaction;

	DEBUGFUNC("i40e_nvmupd_validate_command\n");

	/* anything that doesn't match a recognized case is an error */
	upd_cmd = I40E_NVMUPD_INVALID;

	transaction = i40e_nvmupd_get_transaction(cmd->config);
	module = i40e_nvmupd_get_module(cmd->config);

	/* limits on data size */
	if ((cmd->data_size < 1) ||
	    (cmd->data_size > I40E_NVMUPD_MAX_DATA)) {
		i40e_debug(hw, I40E_DEBUG_NVM,
			   "i40e_nvmupd_validate_command data_size %d\n",
			   cmd->data_size);
		*perrno = -EFAULT;
		return I40E_NVMUPD_INVALID;
	}

	switch (cmd->command) {
	case I40E_NVM_READ:
		switch (transaction) {
		case I40E_NVM_CON:
			upd_cmd = I40E_NVMUPD_READ_CON;
			break;
		case I40E_NVM_SNT:
			upd_cmd = I40E_NVMUPD_READ_SNT;
			break;
		case I40E_NVM_LCB:
			upd_cmd = I40E_NVMUPD_READ_LCB;
			break;
		case I40E_NVM_SA:
			upd_cmd = I40E_NVMUPD_READ_SA;
			break;
		case I40E_NVM_EXEC:
			switch (module) {
			case I40E_NVM_EXEC_GET_AQ_RESULT:
				upd_cmd = I40E_NVMUPD_GET_AQ_RESULT;
				break;
			case I40E_NVM_EXEC_FEATURES:
				upd_cmd = I40E_NVMUPD_FEATURES;
				break;
			case I40E_NVM_EXEC_STATUS:
				upd_cmd = I40E_NVMUPD_STATUS;
				break;
			default:
				*perrno = -EFAULT;
				return I40E_NVMUPD_INVALID;
			}
			break;
		case I40E_NVM_AQE:
			upd_cmd = I40E_NVMUPD_GET_AQ_EVENT;
			break;
		}
		break;

	case I40E_NVM_WRITE:
		switch (transaction) {
		case I40E_NVM_CON:
			upd_cmd = I40E_NVMUPD_WRITE_CON;
			break;
		case I40E_NVM_SNT:
			upd_cmd = I40E_NVMUPD_WRITE_SNT;
			break;
		case I40E_NVM_LCB:
			upd_cmd = I40E_NVMUPD_WRITE_LCB;
			break;
		case I40E_NVM_SA:
			upd_cmd = I40E_NVMUPD_WRITE_SA;
			break;
		case I40E_NVM_ERA:
			upd_cmd = I40E_NVMUPD_WRITE_ERA;
			break;
		case I40E_NVM_CSUM:
			upd_cmd = I40E_NVMUPD_CSUM_CON;
			break;
		case (I40E_NVM_CSUM|I40E_NVM_SA):
			upd_cmd = I40E_NVMUPD_CSUM_SA;
			break;
		case (I40E_NVM_CSUM|I40E_NVM_LCB):
			upd_cmd = I40E_NVMUPD_CSUM_LCB;
			break;
		case I40E_NVM_EXEC:
			if (module == 0)
				upd_cmd = I40E_NVMUPD_EXEC_AQ;
			break;
		}
		break;
	}

	return upd_cmd;
}

/**
 * i40e_nvmupd_exec_aq - Run an AQ command
 * @hw: pointer to hardware structure
 * @cmd: pointer to nvm update command buffer
 * @bytes: pointer to the data buffer
 * @perrno: pointer to return error code
 *
 * cmd structure contains identifiers and data buffer
 **/
static enum i40e_status_code i40e_nvmupd_exec_aq(struct i40e_hw *hw,
						 struct i40e_nvm_access *cmd,
						 u8 *bytes, int *perrno)
{
	struct i40e_asq_cmd_details cmd_details;
	enum i40e_status_code status;
	struct i40e_aq_desc *aq_desc;
	u32 buff_size = 0;
	u8 *buff = NULL;
	u32 aq_desc_len;
	u32 aq_data_len;

	i40e_debug(hw, I40E_DEBUG_NVM, "NVMUPD: %s\n", __func__);
	if (cmd->offset == 0xffff)
		return I40E_SUCCESS;

	memset(&cmd_details, 0, sizeof(cmd_details));
	cmd_details.wb_desc = &hw->nvm_wb_desc;

	aq_desc_len = sizeof(struct i40e_aq_desc);
	memset(&hw->nvm_wb_desc, 0, aq_desc_len);

	/* get the aq descriptor */
	if (cmd->data_size < aq_desc_len) {
		i40e_debug(hw, I40E_DEBUG_NVM,
			   "NVMUPD: not enough aq desc bytes for exec, size %d < %d\n",
			   cmd->data_size, aq_desc_len);
		*perrno = -EINVAL;
		return I40E_ERR_PARAM;
	}
	aq_desc = (struct i40e_aq_desc *)bytes;

	/* if data buffer needed, make sure it's ready */
	aq_data_len = cmd->data_size - aq_desc_len;
	buff_size = max(aq_data_len, (u32)LE16_TO_CPU(aq_desc->datalen));
	if (buff_size) {
		if (!hw->nvm_buff.va) {
			status = i40e_allocate_virt_mem(hw, &hw->nvm_buff,
							hw->aq.asq_buf_size);
			if (status)
				i40e_debug(hw, I40E_DEBUG_NVM,
					   "NVMUPD: i40e_allocate_virt_mem for exec buff failed, %d\n",
					   status);
		}

		if (hw->nvm_buff.va) {
			buff = hw->nvm_buff.va;
			i40e_memcpy(buff, &bytes[aq_desc_len], aq_data_len,
				I40E_NONDMA_TO_NONDMA);
		}
	}

	if (cmd->offset)
		memset(&hw->nvm_aq_event_desc, 0, aq_desc_len);

	/* and away we go! */
	status = i40e_asq_send_command(hw, aq_desc, buff,
				       buff_size, &cmd_details);
	if (status) {
		i40e_debug(hw, I40E_DEBUG_NVM,
			   "i40e_nvmupd_exec_aq err %s aq_err %s\n",
			   i40e_stat_str(hw, status),
			   i40e_aq_str(hw, hw->aq.asq_last_status));
		*perrno = i40e_aq_rc_to_posix(status, hw->aq.asq_last_status);
		return status;
	}

	/* should we wait for a followup event? */
	if (cmd->offset) {
		hw->nvm_wait_opcode = cmd->offset;
		hw->nvmupd_state = I40E_NVMUPD_STATE_INIT_WAIT;
	}

	return status;
}

/**
 * i40e_nvmupd_get_aq_result - Get the results from the previous exec_aq
 * @hw: pointer to hardware structure
 * @cmd: pointer to nvm update command buffer
 * @bytes: pointer to the data buffer
 * @perrno: pointer to return error code
 *
 * cmd structure contains identifiers and data buffer
 **/
static enum i40e_status_code i40e_nvmupd_get_aq_result(struct i40e_hw *hw,
						    struct i40e_nvm_access *cmd,
						    u8 *bytes, int *perrno)
{
	u32 aq_total_len;
	u32 aq_desc_len;
	int remainder;
	u8 *buff;

	i40e_debug(hw, I40E_DEBUG_NVM, "NVMUPD: %s\n", __func__);

	aq_desc_len = sizeof(struct i40e_aq_desc);
	aq_total_len = aq_desc_len + LE16_TO_CPU(hw->nvm_wb_desc.datalen);

	/* check offset range */
	if (cmd->offset > aq_total_len) {
		i40e_debug(hw, I40E_DEBUG_NVM, "%s: offset too big %d > %d\n",
			   __func__, cmd->offset, aq_total_len);
		*perrno = -EINVAL;
		return I40E_ERR_PARAM;
	}

	/* check copylength range */
	if (cmd->data_size > (aq_total_len - cmd->offset)) {
		int new_len = aq_total_len - cmd->offset;

		i40e_debug(hw, I40E_DEBUG_NVM, "%s: copy length %d too big, trimming to %d\n",
			   __func__, cmd->data_size, new_len);
		cmd->data_size = new_len;
	}

	remainder = cmd->data_size;
	if (cmd->offset < aq_desc_len) {
		u32 len = aq_desc_len - cmd->offset;

		len = min(len, cmd->data_size);
		i40e_debug(hw, I40E_DEBUG_NVM, "%s: aq_desc bytes %d to %d\n",
			   __func__, cmd->offset, cmd->offset + len);

		buff = ((u8 *)&hw->nvm_wb_desc) + cmd->offset;
		i40e_memcpy(bytes, buff, len, I40E_NONDMA_TO_NONDMA);

		bytes += len;
		remainder -= len;
		buff = hw->nvm_buff.va;
	} else {
		buff = (u8 *)hw->nvm_buff.va + (cmd->offset - aq_desc_len);
	}

	if (remainder > 0) {
		int start_byte = buff - (u8 *)hw->nvm_buff.va;

		i40e_debug(hw, I40E_DEBUG_NVM, "%s: databuf bytes %d to %d\n",
			   __func__, start_byte, start_byte + remainder);
		i40e_memcpy(bytes, buff, remainder, I40E_NONDMA_TO_NONDMA);
	}

	return I40E_SUCCESS;
}

/**
 * i40e_nvmupd_get_aq_event - Get the Admin Queue event from previous exec_aq
 * @hw: pointer to hardware structure
 * @cmd: pointer to nvm update command buffer
 * @bytes: pointer to the data buffer
 * @perrno: pointer to return error code
 *
 * cmd structure contains identifiers and data buffer
 **/
static enum i40e_status_code i40e_nvmupd_get_aq_event(struct i40e_hw *hw,
						    struct i40e_nvm_access *cmd,
						    u8 *bytes, int *perrno)
{
	u32 aq_total_len;
	u32 aq_desc_len;

	i40e_debug(hw, I40E_DEBUG_NVM, "NVMUPD: %s\n", __func__);

	aq_desc_len = sizeof(struct i40e_aq_desc);
	aq_total_len = aq_desc_len + LE16_TO_CPU(hw->nvm_aq_event_desc.datalen);

	/* check copylength range */
	if (cmd->data_size > aq_total_len) {
		i40e_debug(hw, I40E_DEBUG_NVM,
			   "%s: copy length %d too big, trimming to %d\n",
			   __func__, cmd->data_size, aq_total_len);
		cmd->data_size = aq_total_len;
	}

	i40e_memcpy(bytes, &hw->nvm_aq_event_desc, cmd->data_size,
		    I40E_NONDMA_TO_NONDMA);

	return I40E_SUCCESS;
}

/**
 * i40e_nvmupd_nvm_read - Read NVM
 * @hw: pointer to hardware structure
 * @cmd: pointer to nvm update command buffer
 * @bytes: pointer to the data buffer
 * @perrno: pointer to return error code
 *
 * cmd structure contains identifiers and data buffer
 **/
static enum i40e_status_code i40e_nvmupd_nvm_read(struct i40e_hw *hw,
						  struct i40e_nvm_access *cmd,
						  u8 *bytes, int *perrno)
{
	struct i40e_asq_cmd_details cmd_details;
	enum i40e_status_code status;
	u8 module, transaction;
	bool last;

	transaction = i40e_nvmupd_get_transaction(cmd->config);
	module = i40e_nvmupd_get_module(cmd->config);
	last = (transaction == I40E_NVM_LCB) || (transaction == I40E_NVM_SA);

	memset(&cmd_details, 0, sizeof(cmd_details));
	cmd_details.wb_desc = &hw->nvm_wb_desc;

	status = i40e_aq_read_nvm(hw, module, cmd->offset, (u16)cmd->data_size,
				  bytes, last, &cmd_details);
	if (status) {
		i40e_debug(hw, I40E_DEBUG_NVM,
			   "i40e_nvmupd_nvm_read mod 0x%x  off 0x%x  len 0x%x\n",
			   module, cmd->offset, cmd->data_size);
		i40e_debug(hw, I40E_DEBUG_NVM,
			   "i40e_nvmupd_nvm_read status %d aq %d\n",
			   status, hw->aq.asq_last_status);
		*perrno = i40e_aq_rc_to_posix(status, hw->aq.asq_last_status);
	}

	return status;
}

/**
 * i40e_nvmupd_nvm_erase - Erase an NVM module
 * @hw: pointer to hardware structure
 * @cmd: pointer to nvm update command buffer
 * @perrno: pointer to return error code
 *
 * module, offset, data_size and data are in cmd structure
 **/
static enum i40e_status_code i40e_nvmupd_nvm_erase(struct i40e_hw *hw,
						   struct i40e_nvm_access *cmd,
						   int *perrno)
{
	enum i40e_status_code status = I40E_SUCCESS;
	struct i40e_asq_cmd_details cmd_details;
	u8 module, transaction;
	bool last;

	transaction = i40e_nvmupd_get_transaction(cmd->config);
	module = i40e_nvmupd_get_module(cmd->config);
	last = (transaction & I40E_NVM_LCB);

	memset(&cmd_details, 0, sizeof(cmd_details));
	cmd_details.wb_desc = &hw->nvm_wb_desc;

	status = i40e_aq_erase_nvm(hw, module, cmd->offset, (u16)cmd->data_size,
				   last, &cmd_details);
	if (status) {
		i40e_debug(hw, I40E_DEBUG_NVM,
			   "i40e_nvmupd_nvm_erase mod 0x%x  off 0x%x len 0x%x\n",
			   module, cmd->offset, cmd->data_size);
		i40e_debug(hw, I40E_DEBUG_NVM,
			   "i40e_nvmupd_nvm_erase status %d aq %d\n",
			   status, hw->aq.asq_last_status);
		*perrno = i40e_aq_rc_to_posix(status, hw->aq.asq_last_status);
	}

	return status;
}

/**
 * i40e_nvmupd_nvm_write - Write NVM
 * @hw: pointer to hardware structure
 * @cmd: pointer to nvm update command buffer
 * @bytes: pointer to the data buffer
 * @perrno: pointer to return error code
 *
 * module, offset, data_size and data are in cmd structure
 **/
static enum i40e_status_code i40e_nvmupd_nvm_write(struct i40e_hw *hw,
						   struct i40e_nvm_access *cmd,
						   u8 *bytes, int *perrno)
{
	enum i40e_status_code status = I40E_SUCCESS;
	struct i40e_asq_cmd_details cmd_details;
	u8 module, transaction;
	u8 preservation_flags;
	bool last;

	transaction = i40e_nvmupd_get_transaction(cmd->config);
	module = i40e_nvmupd_get_module(cmd->config);
	last = (transaction & I40E_NVM_LCB);
	preservation_flags = i40e_nvmupd_get_preservation_flags(cmd->config);

	memset(&cmd_details, 0, sizeof(cmd_details));
	cmd_details.wb_desc = &hw->nvm_wb_desc;

	status = i40e_aq_update_nvm(hw, module, cmd->offset,
				    (u16)cmd->data_size, bytes, last,
				    preservation_flags, &cmd_details);
	if (status) {
		i40e_debug(hw, I40E_DEBUG_NVM,
			   "i40e_nvmupd_nvm_write mod 0x%x off 0x%x len 0x%x\n",
			   module, cmd->offset, cmd->data_size);
		i40e_debug(hw, I40E_DEBUG_NVM,
			   "i40e_nvmupd_nvm_write status %d aq %d\n",
			   status, hw->aq.asq_last_status);
		*perrno = i40e_aq_rc_to_posix(status, hw->aq.asq_last_status);
	}

	return status;
}