272 lines
6.4 KiB
C
272 lines
6.4 KiB
C
/*
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*
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* Intel Management Engine Interface (Intel MEI) Linux driver
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* Copyright (c) 2003-2012, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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*/
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#include <linux/export.h>
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#include <linux/pci.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <linux/delay.h>
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#include <linux/mei.h>
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#include "mei_dev.h"
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#include "hbm.h"
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#include "client.h"
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const char *mei_dev_state_str(int state)
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{
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#define MEI_DEV_STATE(state) case MEI_DEV_##state: return #state
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switch (state) {
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MEI_DEV_STATE(INITIALIZING);
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MEI_DEV_STATE(INIT_CLIENTS);
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MEI_DEV_STATE(ENABLED);
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MEI_DEV_STATE(RESETTING);
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MEI_DEV_STATE(DISABLED);
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MEI_DEV_STATE(POWER_DOWN);
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MEI_DEV_STATE(POWER_UP);
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default:
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return "unknown";
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}
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#undef MEI_DEV_STATE
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}
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/**
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* mei_start - initializes host and fw to start work.
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*
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* @dev: the device structure
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*
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* returns 0 on success, <0 on failure.
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*/
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int mei_start(struct mei_device *dev)
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{
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mutex_lock(&dev->device_lock);
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/* acknowledge interrupt and stop interupts */
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mei_clear_interrupts(dev);
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mei_hw_config(dev);
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dev_dbg(&dev->pdev->dev, "reset in start the mei device.\n");
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mei_reset(dev, 1);
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if (mei_hbm_start_wait(dev)) {
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dev_err(&dev->pdev->dev, "HBM haven't started");
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goto err;
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}
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if (!mei_host_is_ready(dev)) {
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dev_err(&dev->pdev->dev, "host is not ready.\n");
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goto err;
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}
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if (!mei_hw_is_ready(dev)) {
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dev_err(&dev->pdev->dev, "ME is not ready.\n");
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goto err;
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}
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if (!mei_hbm_version_is_supported(dev)) {
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dev_dbg(&dev->pdev->dev, "MEI start failed.\n");
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goto err;
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}
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dev_dbg(&dev->pdev->dev, "link layer has been established.\n");
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mutex_unlock(&dev->device_lock);
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return 0;
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err:
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dev_err(&dev->pdev->dev, "link layer initialization failed.\n");
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dev->dev_state = MEI_DEV_DISABLED;
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mutex_unlock(&dev->device_lock);
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return -ENODEV;
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}
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EXPORT_SYMBOL_GPL(mei_start);
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/**
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* mei_cancel_work. Cancel mei background jobs
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*
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* @dev: the device structure
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*/
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void mei_cancel_work(struct mei_device *dev)
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{
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cancel_work_sync(&dev->init_work);
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cancel_work_sync(&dev->reset_work);
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cancel_delayed_work(&dev->timer_work);
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}
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EXPORT_SYMBOL_GPL(mei_cancel_work);
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/**
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* mei_reset - resets host and fw.
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*
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* @dev: the device structure
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* @interrupts_enabled: if interrupt should be enabled after reset.
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*/
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void mei_reset(struct mei_device *dev, int interrupts_enabled)
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{
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bool unexpected;
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int ret;
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unexpected = (dev->dev_state != MEI_DEV_INITIALIZING &&
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dev->dev_state != MEI_DEV_DISABLED &&
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dev->dev_state != MEI_DEV_POWER_DOWN &&
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dev->dev_state != MEI_DEV_POWER_UP);
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if (unexpected)
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dev_warn(&dev->pdev->dev, "unexpected reset: dev_state = %s\n",
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mei_dev_state_str(dev->dev_state));
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/* we're already in reset, cancel the init timer
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* if the reset was called due the hbm protocol error
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* we need to call it before hw start
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* so the hbm watchdog won't kick in
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*/
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mei_hbm_idle(dev);
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ret = mei_hw_reset(dev, interrupts_enabled);
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if (ret) {
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dev_err(&dev->pdev->dev, "hw reset failed disabling the device\n");
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interrupts_enabled = false;
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}
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if (dev->dev_state != MEI_DEV_INITIALIZING &&
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dev->dev_state != MEI_DEV_POWER_UP) {
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if (dev->dev_state != MEI_DEV_DISABLED &&
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dev->dev_state != MEI_DEV_POWER_DOWN)
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dev->dev_state = MEI_DEV_RESETTING;
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/* remove all waiting requests */
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mei_cl_all_write_clear(dev);
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mei_cl_all_disconnect(dev);
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/* wake up all readings so they can be interrupted */
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mei_cl_all_wakeup(dev);
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/* remove entry if already in list */
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dev_dbg(&dev->pdev->dev, "remove iamthif and wd from the file list.\n");
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mei_cl_unlink(&dev->wd_cl);
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mei_cl_unlink(&dev->iamthif_cl);
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mei_amthif_reset_params(dev);
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memset(&dev->wr_ext_msg, 0, sizeof(dev->wr_ext_msg));
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}
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dev->me_clients_num = 0;
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dev->rd_msg_hdr = 0;
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dev->wd_pending = false;
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if (!interrupts_enabled) {
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dev_dbg(&dev->pdev->dev, "intr not enabled end of reset\n");
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dev->dev_state = MEI_DEV_DISABLED;
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return;
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}
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ret = mei_hw_start(dev);
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if (ret) {
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dev_err(&dev->pdev->dev, "hw_start failed disabling the device\n");
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dev->dev_state = MEI_DEV_DISABLED;
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return;
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}
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dev_dbg(&dev->pdev->dev, "link is established start sending messages.\n");
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/* link is established * start sending messages. */
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dev->dev_state = MEI_DEV_INIT_CLIENTS;
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ret = mei_hbm_start_req(dev);
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if (ret) {
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dev_err(&dev->pdev->dev, "hbm_start failed disabling the device\n");
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dev->dev_state = MEI_DEV_DISABLED;
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return;
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}
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}
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EXPORT_SYMBOL_GPL(mei_reset);
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static void mei_reset_work(struct work_struct *work)
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{
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struct mei_device *dev =
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container_of(work, struct mei_device, reset_work);
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mutex_lock(&dev->device_lock);
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mei_reset(dev, true);
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mutex_unlock(&dev->device_lock);
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}
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void mei_stop(struct mei_device *dev)
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{
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dev_dbg(&dev->pdev->dev, "stopping the device.\n");
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mei_cancel_work(dev);
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mei_nfc_host_exit(dev);
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mutex_lock(&dev->device_lock);
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mei_wd_stop(dev);
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dev->dev_state = MEI_DEV_POWER_DOWN;
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mei_reset(dev, 0);
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mutex_unlock(&dev->device_lock);
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mei_watchdog_unregister(dev);
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}
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EXPORT_SYMBOL_GPL(mei_stop);
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void mei_device_init(struct mei_device *dev)
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{
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/* setup our list array */
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INIT_LIST_HEAD(&dev->file_list);
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INIT_LIST_HEAD(&dev->device_list);
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mutex_init(&dev->device_lock);
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init_waitqueue_head(&dev->wait_hw_ready);
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init_waitqueue_head(&dev->wait_recvd_msg);
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init_waitqueue_head(&dev->wait_stop_wd);
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dev->dev_state = MEI_DEV_INITIALIZING;
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mei_io_list_init(&dev->read_list);
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mei_io_list_init(&dev->write_list);
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mei_io_list_init(&dev->write_waiting_list);
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mei_io_list_init(&dev->ctrl_wr_list);
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mei_io_list_init(&dev->ctrl_rd_list);
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INIT_DELAYED_WORK(&dev->timer_work, mei_timer);
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INIT_WORK(&dev->init_work, mei_host_client_init);
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INIT_WORK(&dev->reset_work, mei_reset_work);
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INIT_LIST_HEAD(&dev->wd_cl.link);
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INIT_LIST_HEAD(&dev->iamthif_cl.link);
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mei_io_list_init(&dev->amthif_cmd_list);
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mei_io_list_init(&dev->amthif_rd_complete_list);
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bitmap_zero(dev->host_clients_map, MEI_CLIENTS_MAX);
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dev->open_handle_count = 0;
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/*
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* Reserving the first client ID
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* 0: Reserved for MEI Bus Message communications
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*/
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bitmap_set(dev->host_clients_map, 0, 1);
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}
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EXPORT_SYMBOL_GPL(mei_device_init);
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