1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * Initialization protocol for ISHTP driver 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * Copyright (c) 2003-2016, Intel Corporation. 6*4882a593Smuzhiyun */ 7*4882a593Smuzhiyun 8*4882a593Smuzhiyun #include <linux/export.h> 9*4882a593Smuzhiyun #include <linux/slab.h> 10*4882a593Smuzhiyun #include <linux/sched.h> 11*4882a593Smuzhiyun #include "ishtp-dev.h" 12*4882a593Smuzhiyun #include "hbm.h" 13*4882a593Smuzhiyun #include "client.h" 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun /** 16*4882a593Smuzhiyun * ishtp_dev_state_str() -Convert to string format 17*4882a593Smuzhiyun * @state: state to convert 18*4882a593Smuzhiyun * 19*4882a593Smuzhiyun * Convert state to string for prints 20*4882a593Smuzhiyun * 21*4882a593Smuzhiyun * Return: character pointer to converted string 22*4882a593Smuzhiyun */ ishtp_dev_state_str(int state)23*4882a593Smuzhiyunconst char *ishtp_dev_state_str(int state) 24*4882a593Smuzhiyun { 25*4882a593Smuzhiyun switch (state) { 26*4882a593Smuzhiyun case ISHTP_DEV_INITIALIZING: 27*4882a593Smuzhiyun return "INITIALIZING"; 28*4882a593Smuzhiyun case ISHTP_DEV_INIT_CLIENTS: 29*4882a593Smuzhiyun return "INIT_CLIENTS"; 30*4882a593Smuzhiyun case ISHTP_DEV_ENABLED: 31*4882a593Smuzhiyun return "ENABLED"; 32*4882a593Smuzhiyun case ISHTP_DEV_RESETTING: 33*4882a593Smuzhiyun return "RESETTING"; 34*4882a593Smuzhiyun case ISHTP_DEV_DISABLED: 35*4882a593Smuzhiyun return "DISABLED"; 36*4882a593Smuzhiyun case ISHTP_DEV_POWER_DOWN: 37*4882a593Smuzhiyun return "POWER_DOWN"; 38*4882a593Smuzhiyun case ISHTP_DEV_POWER_UP: 39*4882a593Smuzhiyun return "POWER_UP"; 40*4882a593Smuzhiyun default: 41*4882a593Smuzhiyun return "unknown"; 42*4882a593Smuzhiyun } 43*4882a593Smuzhiyun } 44*4882a593Smuzhiyun 45*4882a593Smuzhiyun /** 46*4882a593Smuzhiyun * ishtp_device_init() - ishtp device init 47*4882a593Smuzhiyun * @dev: ISHTP device instance 48*4882a593Smuzhiyun * 49*4882a593Smuzhiyun * After ISHTP device is alloacted, this function is used to initialize 50*4882a593Smuzhiyun * each field which includes spin lock, work struct and lists 51*4882a593Smuzhiyun */ ishtp_device_init(struct ishtp_device * dev)52*4882a593Smuzhiyunvoid ishtp_device_init(struct ishtp_device *dev) 53*4882a593Smuzhiyun { 54*4882a593Smuzhiyun dev->dev_state = ISHTP_DEV_INITIALIZING; 55*4882a593Smuzhiyun INIT_LIST_HEAD(&dev->cl_list); 56*4882a593Smuzhiyun INIT_LIST_HEAD(&dev->device_list); 57*4882a593Smuzhiyun dev->rd_msg_fifo_head = 0; 58*4882a593Smuzhiyun dev->rd_msg_fifo_tail = 0; 59*4882a593Smuzhiyun spin_lock_init(&dev->rd_msg_spinlock); 60*4882a593Smuzhiyun 61*4882a593Smuzhiyun init_waitqueue_head(&dev->wait_hbm_recvd_msg); 62*4882a593Smuzhiyun spin_lock_init(&dev->read_list_spinlock); 63*4882a593Smuzhiyun spin_lock_init(&dev->device_lock); 64*4882a593Smuzhiyun spin_lock_init(&dev->device_list_lock); 65*4882a593Smuzhiyun spin_lock_init(&dev->cl_list_lock); 66*4882a593Smuzhiyun spin_lock_init(&dev->fw_clients_lock); 67*4882a593Smuzhiyun INIT_WORK(&dev->bh_hbm_work, bh_hbm_work_fn); 68*4882a593Smuzhiyun 69*4882a593Smuzhiyun bitmap_zero(dev->host_clients_map, ISHTP_CLIENTS_MAX); 70*4882a593Smuzhiyun dev->open_handle_count = 0; 71*4882a593Smuzhiyun 72*4882a593Smuzhiyun /* 73*4882a593Smuzhiyun * Reserving client ID 0 for ISHTP Bus Message communications 74*4882a593Smuzhiyun */ 75*4882a593Smuzhiyun bitmap_set(dev->host_clients_map, 0, 1); 76*4882a593Smuzhiyun 77*4882a593Smuzhiyun INIT_LIST_HEAD(&dev->read_list.list); 78*4882a593Smuzhiyun 79*4882a593Smuzhiyun } 80*4882a593Smuzhiyun EXPORT_SYMBOL(ishtp_device_init); 81*4882a593Smuzhiyun 82*4882a593Smuzhiyun /** 83*4882a593Smuzhiyun * ishtp_start() - Start ISH processing 84*4882a593Smuzhiyun * @dev: ISHTP device instance 85*4882a593Smuzhiyun * 86*4882a593Smuzhiyun * Start ISHTP processing by sending query subscriber message 87*4882a593Smuzhiyun * 88*4882a593Smuzhiyun * Return: 0 on success else -ENODEV 89*4882a593Smuzhiyun */ ishtp_start(struct ishtp_device * dev)90*4882a593Smuzhiyunint ishtp_start(struct ishtp_device *dev) 91*4882a593Smuzhiyun { 92*4882a593Smuzhiyun if (ishtp_hbm_start_wait(dev)) { 93*4882a593Smuzhiyun dev_err(dev->devc, "HBM haven't started"); 94*4882a593Smuzhiyun goto err; 95*4882a593Smuzhiyun } 96*4882a593Smuzhiyun 97*4882a593Smuzhiyun /* suspend & resume notification - send QUERY_SUBSCRIBERS msg */ 98*4882a593Smuzhiyun ishtp_query_subscribers(dev); 99*4882a593Smuzhiyun 100*4882a593Smuzhiyun return 0; 101*4882a593Smuzhiyun err: 102*4882a593Smuzhiyun dev_err(dev->devc, "link layer initialization failed.\n"); 103*4882a593Smuzhiyun dev->dev_state = ISHTP_DEV_DISABLED; 104*4882a593Smuzhiyun return -ENODEV; 105*4882a593Smuzhiyun } 106*4882a593Smuzhiyun EXPORT_SYMBOL(ishtp_start); 107