251 lines
6.5 KiB
C
251 lines
6.5 KiB
C
/*
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* Initialization protocol for HECI driver
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*
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* Copyright (c) 2003-2014, 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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#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 "heci.h"
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#include "heci_dev.h"
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#include "hbm.h"
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#include "client.h"
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#include "utils.h"
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#ifdef dev_dbg
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#undef dev_dbg
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#endif
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#define dev_dbg dev_err
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const char *heci_dev_state_str(int state)
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{
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#define HECI_DEV_STATE(state) case HECI_DEV_##state: return #state
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switch (state) {
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HECI_DEV_STATE(INITIALIZING);
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HECI_DEV_STATE(INIT_CLIENTS);
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HECI_DEV_STATE(ENABLED);
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HECI_DEV_STATE(RESETTING);
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HECI_DEV_STATE(DISABLED);
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HECI_DEV_STATE(POWER_DOWN);
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HECI_DEV_STATE(POWER_UP);
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default:
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return "unkown";
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}
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#undef HECI_DEV_STATE
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}
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EXPORT_SYMBOL(heci_dev_state_str);
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void heci_device_init(struct heci_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_dma_ready);
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dev->dev_state = HECI_DEV_INITIALIZING;
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/* We need to reserve something, because client #0
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* is reserved for HECI bus messages
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*/
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bitmap_zero(dev->host_clients_map, HECI_CLIENTS_MAX);
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dev->open_handle_count = 0;
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/*
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* Reserving the first three client IDs
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* 0: Reserved for HECI Bus Message communications
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* 1: Reserved for Watchdog
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* 2: Reserved for AMTHI
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*/
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bitmap_set(dev->host_clients_map, 0, 3);
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heci_io_list_init(&dev->read_list);
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heci_io_list_init(&dev->write_list);
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heci_io_list_init(&dev->write_waiting_list);
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heci_io_list_init(&dev->ctrl_wr_list);
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heci_io_list_init(&dev->ctrl_rd_list);
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INIT_DELAYED_WORK(&dev->timer_work, heci_timer);
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INIT_WORK(&dev->init_work, heci_host_client_init);
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}
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EXPORT_SYMBOL_GPL(heci_device_init);
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/**
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* heci_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 heci_start(struct heci_device *dev)
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{
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heci_hw_config(dev);
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#ifdef FORCE_FW_INIT_RESET
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/* wait for FW-initiated reset flow, indefinitely */
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heci_hw_start(dev);
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heci_enable_interrupts(dev);
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timed_wait_for_timeout(WAIT_FOR_CONNECT_SLICE, dev->recvd_hw_ready, (2*HZ));
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/* Lock only after FW-reset flow worked or failed.
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* Otherwise interrupts BH will be locked
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*/
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mutex_lock(&dev->device_lock);
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if (dev->recvd_hw_ready)
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goto reset_done;
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#else
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mutex_lock(&dev->device_lock);
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#endif
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/* acknowledge interrupt and stop interupts */
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heci_clear_interrupts(dev);
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dev_dbg(&dev->pdev->dev, "reset in start the heci device.\n");
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heci_reset(dev, 1);
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reset_done:
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if (heci_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 (!heci_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 (!heci_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 (dev->version.major_version != HBM_MAJOR_VERSION ||
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dev->version.minor_version != HBM_MINOR_VERSION) {
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dev_dbg(&dev->pdev->dev, "HECI 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 = HECI_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(heci_start);
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/**
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* heci_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 heci_reset(struct heci_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 != HECI_DEV_INITIALIZING &&
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dev->dev_state != HECI_DEV_DISABLED &&
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dev->dev_state != HECI_DEV_POWER_DOWN &&
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dev->dev_state != HECI_DEV_POWER_UP);
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ret = heci_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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dev->dev_state = HECI_DEV_DISABLED;
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}
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dev->hbm_state = HECI_HBM_IDLE;
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if (dev->dev_state != HECI_DEV_INITIALIZING) {
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if (dev->dev_state != HECI_DEV_DISABLED &&
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dev->dev_state != HECI_DEV_POWER_DOWN)
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dev->dev_state = HECI_DEV_RESETTING;
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heci_cl_all_disconnect(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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if (unexpected)
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dev_warn(&dev->pdev->dev, "unexpected reset: dev_state = %s\n",
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heci_dev_state_str(dev->dev_state));
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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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return;
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}
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dev_dbg(&dev->pdev->dev, "before sending HOST start\n");
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ret = heci_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 = HECI_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 = HECI_DEV_INIT_CLIENTS;
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dev->hbm_state = HECI_HBM_START;
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heci_hbm_start_req(dev);
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/* wake up all readings so they can be interrupted */
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heci_cl_all_read_wakeup(dev);
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/* remove all waiting requests */
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heci_cl_all_write_clear(dev);
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}
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EXPORT_SYMBOL_GPL(heci_reset);
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void heci_stop(struct heci_device *dev)
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{
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dev_dbg(&dev->pdev->dev, "stopping the device.\n");
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mutex_lock(&dev->device_lock);
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cancel_delayed_work(&dev->timer_work);
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dev->dev_state = HECI_DEV_POWER_DOWN;
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heci_reset(dev, 0);
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mutex_unlock(&dev->device_lock);
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flush_scheduled_work();
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}
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EXPORT_SYMBOL_GPL(heci_stop);
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/**
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* heci_write_is_idle - check if there is pending write transaction
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*
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* @dev: the device structure
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* returns true if the writ queues are empty
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*/
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bool heci_write_is_idle(struct heci_device *dev)
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{
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bool idle = (dev->wr_ext_msg.hdr.length == 0 &&
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list_empty(&dev->ctrl_wr_list.list) &&
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list_empty(&dev->write_list.list));
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dev_dbg(&dev->pdev->dev, "pm: is idle[%d] extra=%d, ctrl=%d write=%d\n",
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idle,
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dev->wr_ext_msg.hdr.length == 0,
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list_empty(&dev->ctrl_wr_list.list),
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list_empty(&dev->write_list.list));
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return idle;
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}
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EXPORT_SYMBOL_GPL(heci_write_is_idle);
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