path: root/drivers/misc/mei/hw-txe.c

/*
 *
 * Intel Management Engine Interface (Intel MEI) Linux driver
 * Copyright (c) 2013-2014, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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.
 *
 */

#include <linux/pci.h>
#include <linux/jiffies.h>
#include <linux/delay.h>
#include <linux/kthread.h>
#include <linux/irqreturn.h>

#include <linux/mei.h>

#include "mei_dev.h"
#include "hw-txe.h"
#include "client.h"
#include "hbm.h"

/**
 * mei_txe_reg_read - Reads 32bit data from the device
 *
 * @base_addr: registers base address
 * @offset: register offset
 *
 */
static inline u32 mei_txe_reg_read(void __iomem *base_addr,
					unsigned long offset)
{
	return ioread32(base_addr + offset);
}

/**
 * mei_txe_reg_write - Writes 32bit data to the device
 *
 * @base_addr: registers base address
 * @offset: register offset
 * @value: the value to write
 */
static inline void mei_txe_reg_write(void __iomem *base_addr,
				unsigned long offset, u32 value)
{
	iowrite32(value, base_addr + offset);
}

/**
 * mei_txe_sec_reg_read_silent - Reads 32bit data from the SeC BAR
 *
 * @dev: the device structure
 * @offset: register offset
 *
 * Doesn't check for aliveness while Reads 32bit data from the SeC BAR
 */
static inline u32 mei_txe_sec_reg_read_silent(struct mei_txe_hw *hw,
				unsigned long offset)
{
	return mei_txe_reg_read(hw->mem_addr[SEC_BAR], offset);
}

/**
 * mei_txe_sec_reg_read - Reads 32bit data from the SeC BAR
 *
 * @dev: the device structure
 * @offset: register offset
 *
 * Reads 32bit data from the SeC BAR and shout loud if aliveness is not set
 */
static inline u32 mei_txe_sec_reg_read(struct mei_txe_hw *hw,
				unsigned long offset)
{
	WARN(!hw->aliveness, "sec read: aliveness not asserted\n");
	return mei_txe_sec_reg_read_silent(hw, offset);
}
/**
 * mei_txe_sec_reg_write_silent - Writes 32bit data to the SeC BAR
 *   doesn't check for aliveness
 *
 * @dev: the device structure
 * @offset: register offset
 * @value: value to write
 *
 * Doesn't check for aliveness while writes 32bit data from to the SeC BAR
 */
static inline void mei_txe_sec_reg_write_silent(struct mei_txe_hw *hw,
				unsigned long offset, u32 value)
{
	mei_txe_reg_write(hw->mem_addr[SEC_BAR], offset, value);
}

/**
 * mei_txe_sec_reg_write - Writes 32bit data to the SeC BAR
 *
 * @dev: the device structure
 * @offset: register offset
 * @value: value to write
 *
 * Writes 32bit data from the SeC BAR and shout loud if aliveness is not set
 */
static inline void mei_txe_sec_reg_write(struct mei_txe_hw *hw,
				unsigned long offset, u32 value)
{
	WARN(!hw->aliveness, "sec write: aliveness not asserted\n");
	mei_txe_sec_reg_write_silent(hw, offset, value);
}
/**
 * mei_txe_br_reg_read - Reads 32bit data from the Bridge BAR
 *
 * @hw: the device structure
 * @offset: offset from which to read the data
 *
 */
static inline u32 mei_txe_br_reg_read(struct mei_txe_hw *hw,
				unsigned long offset)
{
	return mei_txe_reg_read(hw->mem_addr[BRIDGE_BAR], offset);
}

/**
 * mei_txe_br_reg_write - Writes 32bit data to the Bridge BAR
 *
 * @hw: the device structure
 * @offset: offset from which to write the data
 * @value: the byte to write
 */
static inline void mei_txe_br_reg_write(struct mei_txe_hw *hw,
				unsigned long offset, u32 value)
{
	mei_txe_reg_write(hw->mem_addr[BRIDGE_BAR], offset, value);
}

/**
 * mei_txe_aliveness_set - request for aliveness change
 *
 * @dev: the device structure
 * @req: requested aliveness value
 *
 * Request for aliveness change and returns true if the change is
 *   really needed and false if aliveness is already
 *   in the requested state
 * Requires device lock to be held
 */
static bool mei_txe_aliveness_set(struct mei_device *dev, u32 req)
{

	struct mei_txe_hw *hw = to_txe_hw(dev);
	bool do_req = hw->aliveness != req;

	dev_dbg(&dev->pdev->dev, "Aliveness current=%d request=%d\n",
				hw->aliveness, req);
	if (do_req) {
		hw->recvd_aliveness = false;
		mei_txe_br_reg_write(hw, SICR_HOST_ALIVENESS_REQ_REG, req);
	}
	return do_req;
}


/**
 * mei_txe_aliveness_req_get - get aliveness requested register value
 *
 * @dev: the device structure
 *
 * Extract HICR_HOST_ALIVENESS_RESP_ACK bit from
 * from HICR_HOST_ALIVENESS_REQ register value
 */
static u32 mei_txe_aliveness_req_get(struct mei_device *dev)
{
	struct mei_txe_hw *hw = to_txe_hw(dev);
	u32 reg;
	reg = mei_txe_br_reg_read(hw, SICR_HOST_ALIVENESS_REQ_REG);