| /* |
| * |
| * 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/export.h> |
| #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 "hbm.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(RESETTING); |
| MEI_DEV_STATE(DISABLED); |
| MEI_DEV_STATE(POWER_DOWN); |
| MEI_DEV_STATE(POWER_UP); |
| default: |
| return "unknown"; |
| } |
| #undef MEI_DEV_STATE |
| } |
| |
| void mei_device_init(struct mei_device *dev) |
| { |
| /* setup our list array */ |
| INIT_LIST_HEAD(&dev->file_list); |
| INIT_LIST_HEAD(&dev->device_list); |
| mutex_init(&dev->device_lock); |
| init_waitqueue_head(&dev->wait_hw_ready); |
| 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); |
| |
| INIT_DELAYED_WORK(&dev->timer_work, mei_timer); |
| INIT_WORK(&dev->init_work, mei_host_client_init); |
| |
| INIT_LIST_HEAD(&dev->wd_cl.link); |
| INIT_LIST_HEAD(&dev->iamthif_cl.link); |
| mei_io_list_init(&dev->amthif_cmd_list); |
| mei_io_list_init(&dev->amthif_rd_complete_list); |
| |
| } |
| EXPORT_SYMBOL_GPL(mei_device_init); |
| |
| /** |
| * mei_start - initializes host and fw to start work. |
| * |
| * @dev: the device structure |
| * |
| * returns 0 on success, <0 on failure. |
| */ |
| int mei_start(struct mei_device *dev) |
| { |
| mutex_lock(&dev->device_lock); |
| |
| /* acknowledge interrupt and stop interupts */ |
| mei_clear_interrupts(dev); |
| |
| mei_hw_config(dev); |
| |
| dev_dbg(&dev->pdev->dev, "reset in start the mei device.\n"); |
| |
| mei_reset(dev, 1); |
| |
| if (mei_hbm_start_wait(dev)) { |
| dev_err(&dev->pdev->dev, "HBM haven't started"); |
| 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 (!mei_hbm_version_is_supported(dev)) { |
| dev_dbg(&dev->pdev->dev, "MEI start failed.\n"); |
| goto err; |
| } |
| |
| 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; |
| } |
| EXPORT_SYMBOL_GPL(mei_start); |
| |
| /** |
| * 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; |
| int ret; |
| |
| 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); |
| |
| ret = mei_hw_reset(dev, interrupts_enabled); |
| if (ret) { |
| dev_err(&dev->pdev->dev, "hw reset failed disabling the device\n"); |
| interrupts_enabled = false; |
| dev->dev_state = MEI_DEV_DISABLED; |
| } |
| |
| dev->hbm_state = MEI_HBM_IDLE; |
| |
| 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_RESETTING; |
| |
| |
| /* remove all waiting requests */ |
| mei_cl_all_write_clear(dev); |
| |
| mei_cl_all_disconnect(dev); |
| |
| /* wake up all readings so they can be interrupted */ |
| mei_cl_all_wakeup(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)); |
| |
| if (!interrupts_enabled) { |
| dev_dbg(&dev->pdev->dev, "intr not enabled end of reset\n"); |
| return; |
| } |
| |
| ret = mei_hw_start(dev); |
| if (ret) { |
| dev_err(&dev->pdev->dev, "hw_start failed disabling the device\n"); |
| dev->dev_state = MEI_DEV_DISABLED; |
| return; |
| } |
| |
| dev_dbg(&dev->pdev->dev, "link is established start sending messages.\n"); |
| /* link is established * start sending messages. */ |
| |
| dev->dev_state = MEI_DEV_INIT_CLIENTS; |
| |
| mei_hbm_start_req(dev); |
| |
| } |
| EXPORT_SYMBOL_GPL(mei_reset); |
| |
| void mei_stop(struct mei_device *dev) |
| { |
| dev_dbg(&dev->pdev->dev, "stopping the device.\n"); |
| |
| flush_scheduled_work(); |
| |
| mutex_lock(&dev->device_lock); |
| |
| cancel_delayed_work(&dev->timer_work); |
| |
| mei_wd_stop(dev); |
| |
| mei_nfc_host_exit(); |
| |
| dev->dev_state = MEI_DEV_POWER_DOWN; |
| mei_reset(dev, 0); |
| |
| mutex_unlock(&dev->device_lock); |
| |
| mei_watchdog_unregister(dev); |
| } |
| EXPORT_SYMBOL_GPL(mei_stop); |
| |
| |
| |