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/*
*
* Intel Management Engine Interface (Intel MEI) Linux driver
* Copyright (c) 2003-2012, 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/sched.h>
#include <linux/wait.h>
#include <linux/delay.h>
#include <linux/mei.h>
#include "mei_dev.h"
#include "client.h"
const char *mei_dev_state_str(int state)
{
#define MEI_DEV_STATE(state) case MEI_DEV_##state: return #state
switch (state) {
MEI_DEV_STATE(INITIALIZING);
MEI_DEV_STATE(INIT_CLIENTS);
MEI_DEV_STATE(ENABLED);
MEI_DEV_STATE(RESETING);
MEI_DEV_STATE(DISABLED);
MEI_DEV_STATE(RECOVERING_FROM_RESET);
MEI_DEV_STATE(POWER_DOWN);
MEI_DEV_STATE(POWER_UP);
default:
return "unkown";
}
#undef MEI_DEV_STATE
}
void mei_device_init(struct mei_device *dev)
{
/* setup our list array */
INIT_LIST_HEAD(&dev->file_list);
mutex_init(&dev->device_lock);
init_waitqueue_head(&dev->wait_recvd_msg);
init_waitqueue_head(&dev->wait_stop_wd);
dev->dev_state = MEI_DEV_INITIALIZING;
mei_io_list_init(&dev->read_list);
mei_io_list_init(&dev->write_list);
mei_io_list_init(&dev->write_waiting_list);
mei_io_list_init(&dev->ctrl_wr_list);
mei_io_list_init(&dev->ctrl_rd_list);
}
/**
* mei_hw_init - initializes host and fw to start work.
*
* @dev: the device structure
*
* returns 0 on success, <0 on failure.
*/
int mei_hw_init(struct mei_device *dev)
{
int ret = 0;
mutex_lock(&dev->device_lock);
/* acknowledge interrupt and stop interupts */
mei_clear_interrupts(dev);
mei_hw_config(dev);
dev->recvd_msg = false;
dev_dbg(&dev->pdev->dev, "reset in start the mei device.\n");
mei_reset(dev, 1);
/* wait for ME to turn on ME_RDY */
if (!dev->recvd_msg) {
mutex_unlock(&dev->device_lock);
ret = wait_event_interruptible_timeout(dev->wait_recvd_msg,
dev->recvd_msg,
mei_secs_to_jiffies(MEI_INTEROP_TIMEOUT));
mutex_lock(&dev->device_lock);
}
if (ret <= 0 && !dev->recvd_msg) {
dev->dev_state = MEI_DEV_DISABLED;
dev_dbg(&dev->pdev->dev,
"wait_event_interruptible_timeout failed"
"on wait for ME to turn on ME_RDY.\n");
goto err;
}
if (!mei_host_is_ready(dev)) {
dev_err(&dev->pdev->dev, "host is not ready.\n");
goto err;
}
if (!mei_hw_is_ready(dev)) {
dev_err(&dev->pdev->dev, "ME is not ready.\n");
goto err;
}
if (dev->version.major_version != HBM_MAJOR_VERSION ||
dev->version.minor_version != HBM_MINOR_VERSION) {
dev_dbg(&dev->pdev->dev, "MEI start failed.\n");
goto err;
}
dev->recvd_msg = false;
dev_dbg(&dev->pdev->dev, "link layer has been established.\n");
mutex_unlock(&dev->device_lock);
return 0;
err:
dev_err(&dev->pdev->dev, "link layer initialization failed.\n");
dev->dev_state = MEI_DEV_DISABLED;
mutex_unlock(&dev->device_lock);
return -ENODEV;
}
/**
* mei_reset - resets host and fw.
*
* @dev: the device structure
* @interrupts_enabled: if interrupt should be enabled after reset.
*/
void mei_reset(struct mei_device *dev, int interrupts_enabled)
{
bool unexpected;
if (dev->dev_state == MEI_DEV_RECOVERING_FROM_RESET)
return;
unexpected = (dev->dev_state != MEI_DEV_INITIALIZING &&
dev->dev_state != MEI_DEV_DISABLED &&
dev->dev_state != MEI_DEV_POWER_DOWN &&
dev->dev_state != MEI_DEV_POWER_UP);
mei_hw_reset(dev, interrupts_enabled);
if (dev->dev_state != MEI_DEV_INITIALIZING) {
if (dev->dev_state != MEI_DEV_DISABLED &&
dev->dev_state != MEI_DEV_POWER_DOWN)
dev->dev_state = MEI_DEV_RESETING;
mei_cl_all_disconnect(dev);
/* remove entry if already in list */
dev_dbg(&dev->pdev->dev, "remove iamthif and wd from the file list.\n");
mei_cl_unlink(&dev->wd_cl);
if (dev->open_handle_count > 0)
dev->open_handle_count--;
mei_cl_unlink(&dev->iamthif_cl);
if (dev->open_handle_count > 0)
dev->open_handle_count--;
mei_amthif_reset_params(dev);
memset(&dev->wr_ext_msg, 0, sizeof(dev->wr_ext_msg));
}
dev->me_clients_num = 0;
dev->rd_msg_hdr = 0;
dev->wd_pending = false;
if (unexpected)
dev_warn(&dev->pdev->dev, "unexpected reset: dev_state = %s\n",
mei_dev_state_str(dev->dev_state));
/* wake up all readings so they can be interrupted */
mei_cl_all_read_wakeup(dev);
/* remove all waiting requests */
mei_cl_all_write_clear(dev);
}
void mei_stop(struct mei_device *dev)
{
dev_dbg(&dev->pdev->dev, "stopping the device.\n");
mutex_lock(&dev->device_lock);
cancel_delayed_work(&dev->timer_work);
mei_wd_stop(dev);
dev->dev_state = MEI_DEV_POWER_DOWN;
mei_reset(dev, 0);
mutex_unlock(&dev->device_lock);
flush_scheduled_work();
}
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