Commit | Line | Data |
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91f01c6d OW |
1 | /* |
2 | * | |
3 | * Intel Management Engine Interface (Intel MEI) Linux driver | |
733ba91c | 4 | * Copyright (c) 2003-2012, Intel Corporation. |
91f01c6d OW |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms and conditions of the GNU General Public License, | |
8 | * version 2, as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | */ | |
16 | ||
17 | #include <linux/pci.h> | |
18 | #include <linux/sched.h> | |
19 | #include <linux/wait.h> | |
20 | #include <linux/delay.h> | |
21 | ||
47a73801 TW |
22 | #include <linux/mei.h> |
23 | ||
91f01c6d | 24 | #include "mei_dev.h" |
90e0b5f1 | 25 | #include "client.h" |
91f01c6d | 26 | |
b210d750 TW |
27 | const char *mei_dev_state_str(int state) |
28 | { | |
29 | #define MEI_DEV_STATE(state) case MEI_DEV_##state: return #state | |
30 | switch (state) { | |
31 | MEI_DEV_STATE(INITIALIZING); | |
32 | MEI_DEV_STATE(INIT_CLIENTS); | |
33 | MEI_DEV_STATE(ENABLED); | |
34 | MEI_DEV_STATE(RESETING); | |
35 | MEI_DEV_STATE(DISABLED); | |
36 | MEI_DEV_STATE(RECOVERING_FROM_RESET); | |
37 | MEI_DEV_STATE(POWER_DOWN); | |
38 | MEI_DEV_STATE(POWER_UP); | |
39 | default: | |
40 | return "unkown"; | |
41 | } | |
42 | #undef MEI_DEV_STATE | |
43 | } | |
44 | ||
52c34561 | 45 | void mei_device_init(struct mei_device *dev) |
91f01c6d | 46 | { |
91f01c6d | 47 | /* setup our list array */ |
91f01c6d | 48 | INIT_LIST_HEAD(&dev->file_list); |
91f01c6d OW |
49 | mutex_init(&dev->device_lock); |
50 | init_waitqueue_head(&dev->wait_recvd_msg); | |
51 | init_waitqueue_head(&dev->wait_stop_wd); | |
b210d750 | 52 | dev->dev_state = MEI_DEV_INITIALIZING; |
0288c7c9 TW |
53 | |
54 | mei_io_list_init(&dev->read_list); | |
55 | mei_io_list_init(&dev->write_list); | |
56 | mei_io_list_init(&dev->write_waiting_list); | |
57 | mei_io_list_init(&dev->ctrl_wr_list); | |
58 | mei_io_list_init(&dev->ctrl_rd_list); | |
91f01c6d OW |
59 | } |
60 | ||
61 | /** | |
62 | * mei_hw_init - initializes host and fw to start work. | |
63 | * | |
64 | * @dev: the device structure | |
65 | * | |
66 | * returns 0 on success, <0 on failure. | |
67 | */ | |
68 | int mei_hw_init(struct mei_device *dev) | |
69 | { | |
e7e0c231 | 70 | int ret = 0; |
91f01c6d OW |
71 | |
72 | mutex_lock(&dev->device_lock); | |
73 | ||
91f01c6d | 74 | /* acknowledge interrupt and stop interupts */ |
3a65dd4e | 75 | mei_clear_interrupts(dev); |
91f01c6d | 76 | |
e7e0c231 | 77 | mei_hw_config(dev); |
24aadc80 | 78 | |
eb9af0ac | 79 | dev->recvd_msg = false; |
91f01c6d OW |
80 | dev_dbg(&dev->pdev->dev, "reset in start the mei device.\n"); |
81 | ||
82 | mei_reset(dev, 1); | |
83 | ||
91f01c6d OW |
84 | /* wait for ME to turn on ME_RDY */ |
85 | if (!dev->recvd_msg) { | |
86 | mutex_unlock(&dev->device_lock); | |
e7e0c231 | 87 | ret = wait_event_interruptible_timeout(dev->wait_recvd_msg, |
3870c320 TW |
88 | dev->recvd_msg, |
89 | mei_secs_to_jiffies(MEI_INTEROP_TIMEOUT)); | |
91f01c6d OW |
90 | mutex_lock(&dev->device_lock); |
91 | } | |
92 | ||
e7e0c231 | 93 | if (ret <= 0 && !dev->recvd_msg) { |
b210d750 | 94 | dev->dev_state = MEI_DEV_DISABLED; |
91f01c6d OW |
95 | dev_dbg(&dev->pdev->dev, |
96 | "wait_event_interruptible_timeout failed" | |
97 | "on wait for ME to turn on ME_RDY.\n"); | |
e7e0c231 | 98 | goto err; |
91f01c6d OW |
99 | } |
100 | ||
91f01c6d | 101 | |
e7e0c231 TW |
102 | if (!mei_host_is_ready(dev)) { |
103 | dev_err(&dev->pdev->dev, "host is not ready.\n"); | |
104 | goto err; | |
105 | } | |
91f01c6d | 106 | |
827eef51 | 107 | if (!mei_hw_is_ready(dev)) { |
e7e0c231 TW |
108 | dev_err(&dev->pdev->dev, "ME is not ready.\n"); |
109 | goto err; | |
91f01c6d OW |
110 | } |
111 | ||
112 | if (dev->version.major_version != HBM_MAJOR_VERSION || | |
113 | dev->version.minor_version != HBM_MINOR_VERSION) { | |
114 | dev_dbg(&dev->pdev->dev, "MEI start failed.\n"); | |
e7e0c231 | 115 | goto err; |
91f01c6d OW |
116 | } |
117 | ||
eb9af0ac | 118 | dev->recvd_msg = false; |
91f01c6d | 119 | dev_dbg(&dev->pdev->dev, "link layer has been established.\n"); |
91f01c6d | 120 | |
91f01c6d | 121 | mutex_unlock(&dev->device_lock); |
e7e0c231 TW |
122 | return 0; |
123 | err: | |
124 | dev_err(&dev->pdev->dev, "link layer initialization failed.\n"); | |
125 | dev->dev_state = MEI_DEV_DISABLED; | |
126 | mutex_unlock(&dev->device_lock); | |
127 | return -ENODEV; | |
91f01c6d OW |
128 | } |
129 | ||
91f01c6d OW |
130 | /** |
131 | * mei_reset - resets host and fw. | |
132 | * | |
133 | * @dev: the device structure | |
134 | * @interrupts_enabled: if interrupt should be enabled after reset. | |
135 | */ | |
136 | void mei_reset(struct mei_device *dev, int interrupts_enabled) | |
137 | { | |
91f01c6d OW |
138 | bool unexpected; |
139 | ||
a9f6b133 | 140 | if (dev->dev_state == MEI_DEV_RECOVERING_FROM_RESET) |
91f01c6d | 141 | return; |
91f01c6d | 142 | |
b210d750 TW |
143 | unexpected = (dev->dev_state != MEI_DEV_INITIALIZING && |
144 | dev->dev_state != MEI_DEV_DISABLED && | |
145 | dev->dev_state != MEI_DEV_POWER_DOWN && | |
146 | dev->dev_state != MEI_DEV_POWER_UP); | |
91f01c6d | 147 | |
91f01c6d OW |
148 | mei_hw_reset(dev, interrupts_enabled); |
149 | ||
91f01c6d | 150 | |
b210d750 TW |
151 | if (dev->dev_state != MEI_DEV_INITIALIZING) { |
152 | if (dev->dev_state != MEI_DEV_DISABLED && | |
153 | dev->dev_state != MEI_DEV_POWER_DOWN) | |
154 | dev->dev_state = MEI_DEV_RESETING; | |
91f01c6d | 155 | |
074b4c01 TW |
156 | mei_cl_all_disconnect(dev); |
157 | ||
91f01c6d | 158 | /* remove entry if already in list */ |
ff8b2f4e | 159 | dev_dbg(&dev->pdev->dev, "remove iamthif and wd from the file list.\n"); |
90e0b5f1 | 160 | mei_cl_unlink(&dev->wd_cl); |
781d0d89 TW |
161 | if (dev->open_handle_count > 0) |
162 | dev->open_handle_count--; | |
90e0b5f1 | 163 | mei_cl_unlink(&dev->iamthif_cl); |
781d0d89 TW |
164 | if (dev->open_handle_count > 0) |
165 | dev->open_handle_count--; | |
91f01c6d | 166 | |
19838fb8 | 167 | mei_amthif_reset_params(dev); |
5fb54fb4 | 168 | memset(&dev->wr_ext_msg, 0, sizeof(dev->wr_ext_msg)); |
91f01c6d OW |
169 | } |
170 | ||
cf9673da | 171 | dev->me_clients_num = 0; |
91f01c6d | 172 | dev->rd_msg_hdr = 0; |
eb9af0ac | 173 | dev->wd_pending = false; |
91f01c6d | 174 | |
91f01c6d | 175 | if (unexpected) |
b210d750 TW |
176 | dev_warn(&dev->pdev->dev, "unexpected reset: dev_state = %s\n", |
177 | mei_dev_state_str(dev->dev_state)); | |
91f01c6d | 178 | |
074b4c01 TW |
179 | /* wake up all readings so they can be interrupted */ |
180 | mei_cl_all_read_wakeup(dev); | |
181 | ||
91f01c6d | 182 | /* remove all waiting requests */ |
074b4c01 | 183 | mei_cl_all_write_clear(dev); |
91f01c6d OW |
184 | } |
185 | ||
186 | ||
c1174c0e | 187 | |
91f01c6d | 188 |