path: root/drivers/net/ethernet/intel/ice/ice_nvm.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2018, Intel Corporation. */

#include "ice_common.h"

/**
 * ice_aq_read_nvm
 * @hw: pointer to the HW struct
 * @module_typeid: module pointer location in words from the NVM beginning
 * @offset: byte offset from the module beginning
 * @length: length of the section to be read (in bytes from the offset)
 * @data: command buffer (size [bytes] = length)
 * @last_command: tells if this is the last command in a series
 * @read_shadow_ram: tell if this is a shadow RAM read
 * @cd: pointer to command details structure or NULL
 *
 * Read the NVM using the admin queue commands (0x0701)
 */
static enum ice_status
ice_aq_read_nvm(struct ice_hw *hw, u16 module_typeid, u32 offset, u16 length,
		void *data, bool last_command, bool read_shadow_ram,
		struct ice_sq_cd *cd)
{
	struct ice_aq_desc desc;
	struct ice_aqc_nvm *cmd;

	cmd = &desc.params.nvm;

	if (offset > ICE_AQC_NVM_MAX_OFFSET)
		return ICE_ERR_PARAM;

	ice_fill_dflt_direct_cmd_desc(&desc, ice_aqc_opc_nvm_read);

	if (!read_shadow_ram && module_typeid == ICE_AQC_NVM_START_POINT)
		cmd->cmd_flags |= ICE_AQC_NVM_FLASH_ONLY;

	/* If this is the last command in a series, set the proper flag. */
	if (last_command)
		cmd->cmd_flags |= ICE_AQC_NVM_LAST_CMD;
	cmd->module_typeid = cpu_to_le16(module_typeid);
	cmd->offset_low = cpu_to_le16(offset & 0xFFFF);
	cmd->offset_high = (offset >> 16) & 0xFF;
	cmd->length = cpu_to_le16(length);

	return ice_aq_send_cmd(hw, &desc, data, length, cd);
}

/**
 * ice_read_flat_nvm - Read portion of NVM by flat offset
 * @hw: pointer to the HW struct
 * @offset: offset from beginning of NVM
 * @length: (in) number of bytes to read; (out) number of bytes actually read
 * @data: buffer to return data in (sized to fit the specified length)
 * @read_shadow_ram: if true, read from shadow RAM instead of NVM
 *
 * Reads a portion of the NVM, as a flat memory space. This function correctly
 * breaks read requests across Shadow RAM sectors and ensures that no single
 * read request exceeds the maximum 4KB read for a single AdminQ command.
 *
 * Returns a status code on failure. Note that the data pointer may be
 * partially updated if some reads succeed before a failure.
 */
enum ice_status
ice_read_flat_nvm(struct ice_hw *hw, u32 offset, u32 *length, u8 *data,
		  bool read_shadow_ram)
{
	enum ice_status status;
	u32 inlen = *length;
	u32 bytes_read = 0;
	bool last_cmd;

	*length = 0;

	/* Verify the length of the read if this is for the Shadow RAM */
	if (read_shadow_ram && ((offset + inlen) > (hw->nvm.sr_words * 2u))) {
		ice_debug(hw, ICE_DBG_NVM, "NVM error: requested offset is beyond Shadow RAM limit\n");
		return ICE_ERR_PARAM;
	}

	do {
		u32 read_size, sector_offset;

		/* ice_aq_read_nvm cannot read more than 4KB at a time.
		 * Additionally, a read from the Shadow RAM may not cross over
		 * a sector boundary. Conveniently, the sector size is also
		 * 4KB.
		 */
		sector_offset = offset % ICE_AQ_MAX_BUF_LEN;
		read_size = min_t(u32, ICE_AQ_MAX_BUF_LEN - sector_offset,
				  inlen - bytes_read);

		last_cmd = !(bytes_read + read_size < inlen);

		status = ice_aq_read_nvm(hw, ICE_AQC_NVM_START_POINT,
					 offset, read_size,
					 data + bytes_read, last_cmd,
					 read_shadow_ram, NULL);
		if (status)
			break;

		bytes_read += read_size;
		offset += read_size;
	} while (!last_cmd);

	*length = bytes_read;
	return status;
}

/**
 * ice_aq_update_nvm
 * @hw: pointer to the HW struct
 * @module_typeid: module pointer location in words from the NVM beginning
 * @offset: byte offset from the module beginning
 * @length: length of the section to be written (in bytes from the offset)
 * @data: command buffer (size [bytes] = length)
 * @last_command: tells if this is the last command in a series
 * @command_flags: command parameters
 * @cd: pointer to command details structure or NULL
 *
 * Update the NVM using the admin queue commands (0x0703)
 */
enum ice_status
ice_aq_update_nvm(struct ice_hw *hw, u16 module_typeid, u32 offset,
		  u16 length, void *data, bool last_command, u8 command_flags,
		  struct ice_sq_cd *cd)
{
	struct ice_aq_desc desc;
	struct ice_aqc_nvm *cmd;

	cmd = &desc.params.nvm;

	/* In offset the highest byte must be zeroed. */
	if (offset & 0xFF000000)
		return ICE_ERR_PARAM;

	ice_fill_dflt_direct_cmd_desc(&desc, ice_aqc_opc_nvm_write);

	cmd->cmd_flags |= command_flags;

	/* If this is the last command in a series, set the proper flag. */
	if (last_command)
		cmd->cmd_flags |= ICE_AQC_NVM_LAST_CMD;
	cmd->module_typeid = cpu_to_le16(module_typeid);
	cmd->offset_low = cpu_to_le16(offset & 0xFFFF);
	cmd->offset_high = (offset >> 16) & 0xFF;
	cmd->length = cpu_to_le16(length);

	desc.flags |= cpu_to_le16(ICE_AQ_FLAG_RD);

	return ice_aq_send_cmd(hw, &desc, data, length, cd);
}

/**
 * ice_aq_erase_nvm
 * @hw: pointer to the HW struct
 * @module_typeid: module pointer location in words from the NVM beginning
 * @cd: pointer to command details structure or NULL
 *
 * Erase the NVM sector using the admin queue commands (0x0702)
 */
enum ice_status
ice_aq_erase_nvm(struct ice_hw *hw, u16 module_typeid, struct ice_sq_cd *cd)
{
	struct ice_aq_desc desc;
	struct ice_aqc_nvm *cmd;

	cmd = &desc.params.nvm;

	ice_fill_dflt_direct_cmd_desc(&desc, ice_aqc_opc_nvm_erase);

	cmd->module_typeid = cpu_to_le16(module_typeid);
	cmd->length = cpu_to_le16(ICE_AQC_NVM_ERASE_LEN);
	cmd->offset_low = 0;
	cmd->offset_high = 0;

	return ice_aq_send_cmd(hw, &desc, NULL, 0, cd);
}

/**
 * ice_read_sr_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 ice_read_flat_nvm.
 */
static enum ice_status
ice_read_sr_word_aq(struct ice_hw *hw, u16 offset, u16 *data)
{
	u32 bytes = sizeof(u16);
	enum ice_status status;
	__le16 data_local;

	/* Note that ice_read_flat_nvm takes into account the 4Kb AdminQ and
	 * Shadow RAM sector restrictions necessary when reading from the NVM.
	 */
	status = ice_read_flat_nvm(hw, offset * sizeof(u16), &bytes,
				   (__force u8 *)&data_local, true);
	if (status)
		return status;

	*data = le16_to_cpu(data_local