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