1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Initialization protocol for ISHTP driver
4 *
5 * Copyright (c) 2003-2016, Intel Corporation.
6 */
7
8 #include <linux/devm-helpers.h>
9 #include <linux/export.h>
10 #include <linux/slab.h>
11 #include <linux/sched.h>
12 #include "ishtp-dev.h"
13 #include "hbm.h"
14 #include "client.h"
15 #include "loader.h"
16
17 /**
18 * ishtp_device_init() - ishtp device init
19 * @dev: ISHTP device instance
20 *
21 * After ISHTP device is alloacted, this function is used to initialize
22 * each field which includes spin lock, work struct and lists
23 */
ishtp_device_init(struct ishtp_device * dev)24 void ishtp_device_init(struct ishtp_device *dev)
25 {
26 int ret;
27
28 dev->dev_state = ISHTP_DEV_INITIALIZING;
29 INIT_LIST_HEAD(&dev->cl_list);
30 INIT_LIST_HEAD(&dev->device_list);
31 dev->rd_msg_fifo_head = 0;
32 dev->rd_msg_fifo_tail = 0;
33 spin_lock_init(&dev->rd_msg_spinlock);
34
35 init_waitqueue_head(&dev->wait_hbm_recvd_msg);
36 init_waitqueue_head(&dev->wait_loader_recvd_msg);
37 spin_lock_init(&dev->read_list_spinlock);
38 spin_lock_init(&dev->device_lock);
39 spin_lock_init(&dev->device_list_lock);
40 spin_lock_init(&dev->cl_list_lock);
41 spin_lock_init(&dev->fw_clients_lock);
42 INIT_WORK(&dev->bh_hbm_work, bh_hbm_work_fn);
43
44 bitmap_zero(dev->host_clients_map, ISHTP_CLIENTS_MAX);
45 dev->open_handle_count = 0;
46
47 /*
48 * Reserving client ID 0 for ISHTP Bus Message communications
49 */
50 bitmap_set(dev->host_clients_map, 0, 1);
51
52 INIT_LIST_HEAD(&dev->read_list.list);
53
54 ret = devm_work_autocancel(dev->devc, &dev->work_fw_loader, ishtp_loader_work);
55 if (ret)
56 dev_err_probe(dev->devc, ret, "Failed to initialise FW loader work\n");
57 }
58 EXPORT_SYMBOL(ishtp_device_init);
59
60 /**
61 * ishtp_start() - Start ISH processing
62 * @dev: ISHTP device instance
63 *
64 * Start ISHTP processing by sending query subscriber message
65 *
66 * Return: 0 on success else -ENODEV
67 */
ishtp_start(struct ishtp_device * dev)68 int ishtp_start(struct ishtp_device *dev)
69 {
70 if (ishtp_hbm_start_wait(dev)) {
71 dev_err(dev->devc, "HBM haven't started");
72 goto err;
73 }
74
75 /* suspend & resume notification - send QUERY_SUBSCRIBERS msg */
76 ishtp_query_subscribers(dev);
77
78 return 0;
79 err:
80 dev_err(dev->devc, "link layer initialization failed.\n");
81 dev->dev_state = ISHTP_DEV_DISABLED;
82 return -ENODEV;
83 }
84 EXPORT_SYMBOL(ishtp_start);
85