/* * * 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 #include #include #include #include #include #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 } /** * mei_cancel_work. Cancel mei background jobs * * @dev: the device structure * * returns 0 on success or < 0 if the reset hasn't succeeded */ void mei_cancel_work(struct mei_device *dev) { cancel_work_sync(&dev->init_work); cancel_work_sync(&dev->reset_work); cancel_delayed_work(&dev->timer_work); } EXPORT_SYMBOL_GPL(mei_cancel_work); /** * mei_reset - resets host and fw. * * @dev: the device structure */ int mei_reset(struct mei_device *dev) { enum mei_dev_state state = dev->dev_state; bool interrupts_enabled; int ret; if (state != MEI_DEV_INITIALIZING && state != MEI_DEV_DISABLED && state != MEI_DEV_POWER_DOWN && state != MEI_DEV_POWER_UP) dev_warn(&dev->pdev->dev, "unexpected reset: dev_state = %s\n", mei_dev_state_str(state)); /* we're already in reset, cancel the init timer * if the reset was called due the hbm protocol error * we need to call it before hw start * so the hbm watchdog won't kick in */ mei_hbm_idle(dev); /* enter reset flow */ interrupts_enabled = state != MEI_DEV_POWER_DOWN; dev->dev_state = MEI_DEV_RESETTING; ret = mei_hw_reset(dev, interrupts_enabled); /* fall through and remove the sw state even if hw reset has failed */ /* no need to clean up software state in case of power up */ if (state != MEI_DEV_INITIALIZING && state != MEI_DEV_POWER_UP) { /* remove all waiting requests */ mei_cl_all_write_clear(dev); mei_cl_all_disconnect(dev); /* wake up all readers and writers 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); mei_cl_unlink(&dev->iamthif_cl); 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 (ret) { dev_err(&dev->pdev->dev, "hw_reset failed ret = %d\n", ret); dev->dev_state = MEI_DEV_DISABLED; return ret; } if (state == MEI_DEV_POWER_DOWN) { dev_dbg(&dev->pdev->dev, "powering down: end of reset\n"); dev->dev_state = MEI_DEV_DISABLED; return 0; } ret = mei_hw_start(dev); if (ret) { dev_err(&dev->pdev->dev, "hw_start failed ret = %d\n", ret); dev->dev_state = MEI_DEV_DISABLED; return ret; } dev_dbg(&dev->pdev->dev, "link is established start sending messages.\n"); dev->dev_state = MEI_DEV_INIT_CLIENTS; ret = mei_hbm_start_req(dev); if (ret) { dev_err(&dev->pdev->dev, "hbm_start failed ret = %d\n", ret); dev->dev_state = MEI_DEV_DISABLED; return ret; } return 0; } EXPORT_SYMBOL_GPL(mei_reset); /** * 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 interrupts */ mei_clear_interrupts(dev); mei_hw_config(dev); dev_dbg(&dev->pdev->dev, "reset in start the mei device.\n"); dev->dev_state = MEI_DEV_INITIALIZING; mei_reset(dev); if (dev->dev_state == MEI_DEV_DISABLED) { dev_err(&dev->pdev->dev, "reset failed"); goto err; } 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_restart - restart device after suspend * * @dev: the device structure * * returns 0 on success or -ENODEV if the restart hasn't succeeded */ int mei_restart(struct mei_device *dev) { int err; mutex_lock(&dev->device_lock); mei_clear_interrupts(dev); dev->dev_state = MEI_DEV_POWER_UP; err = mei_reset(dev); mutex_unlock(&dev->device_lock); if (err || dev->dev_state == MEI_DEV_DISABLED) return -ENODEV; return 0; } EXPORT_SYMBOL_GPL(mei_restart); static void mei_reset_work(struct work_struct *work) { struct mei_device *dev = container_of(work, struct mei_device, reset_work); mutex_lock(&dev->device_lock); mei_reset(dev); mutex_unlock(&dev->device_lock); if (dev->dev_state == MEI_DEV_DISABLED) dev_err(&dev->pdev->dev, "reset failed"); } void mei_stop(struct mei_device *dev) { dev_dbg(&dev->pdev->dev, "stopping the device.\n"); mei_cancel_work(dev); mei_nfc_host_exit(dev); mutex_lock(&dev->device_lock); mei_wd_stop(dev); dev->dev_state = MEI_DEV_POWER_DOWN; mei_reset(dev); mutex_unlock(&dev->device_lock); mei_watchdog_unregister(dev); } EXPORT_SYMBOL_GPL(mei_stop); 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_WORK(&dev->reset_work, mei_reset_work); 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); bitmap_zero(dev->host_clients_map, MEI_CLIENTS_MAX); dev->open_handle_count = 0; /* * Reserving the first client ID * 0: Reserved for MEI Bus Message communications */ bitmap_set(dev->host_clients_map, 0, 1); } EXPORT_SYMBOL_GPL(mei_device_init);