Commit | Line | Data |
---|---|---|
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 | ||
40e0b67b | 17 | #include <linux/export.h> |
91f01c6d OW |
18 | #include <linux/pci.h> |
19 | #include <linux/sched.h> | |
20 | #include <linux/wait.h> | |
21 | #include <linux/delay.h> | |
22 | ||
47a73801 TW |
23 | #include <linux/mei.h> |
24 | ||
91f01c6d | 25 | #include "mei_dev.h" |
aafae7ec | 26 | #include "hbm.h" |
90e0b5f1 | 27 | #include "client.h" |
91f01c6d | 28 | |
b210d750 TW |
29 | const char *mei_dev_state_str(int state) |
30 | { | |
31 | #define MEI_DEV_STATE(state) case MEI_DEV_##state: return #state | |
32 | switch (state) { | |
33 | MEI_DEV_STATE(INITIALIZING); | |
34 | MEI_DEV_STATE(INIT_CLIENTS); | |
35 | MEI_DEV_STATE(ENABLED); | |
36 | MEI_DEV_STATE(RESETING); | |
37 | MEI_DEV_STATE(DISABLED); | |
b210d750 TW |
38 | MEI_DEV_STATE(POWER_DOWN); |
39 | MEI_DEV_STATE(POWER_UP); | |
40 | default: | |
41 | return "unkown"; | |
42 | } | |
43 | #undef MEI_DEV_STATE | |
44 | } | |
45 | ||
52c34561 | 46 | void mei_device_init(struct mei_device *dev) |
91f01c6d | 47 | { |
91f01c6d | 48 | /* setup our list array */ |
91f01c6d | 49 | INIT_LIST_HEAD(&dev->file_list); |
a7b71bc0 | 50 | INIT_LIST_HEAD(&dev->device_list); |
91f01c6d | 51 | mutex_init(&dev->device_lock); |
aafae7ec | 52 | init_waitqueue_head(&dev->wait_hw_ready); |
91f01c6d OW |
53 | init_waitqueue_head(&dev->wait_recvd_msg); |
54 | init_waitqueue_head(&dev->wait_stop_wd); | |
b210d750 | 55 | dev->dev_state = MEI_DEV_INITIALIZING; |
0288c7c9 TW |
56 | |
57 | mei_io_list_init(&dev->read_list); | |
58 | mei_io_list_init(&dev->write_list); | |
59 | mei_io_list_init(&dev->write_waiting_list); | |
60 | mei_io_list_init(&dev->ctrl_wr_list); | |
61 | mei_io_list_init(&dev->ctrl_rd_list); | |
d0265f12 TW |
62 | |
63 | INIT_DELAYED_WORK(&dev->timer_work, mei_timer); | |
64 | INIT_WORK(&dev->init_work, mei_host_client_init); | |
65 | ||
66 | INIT_LIST_HEAD(&dev->wd_cl.link); | |
67 | INIT_LIST_HEAD(&dev->iamthif_cl.link); | |
68 | mei_io_list_init(&dev->amthif_cmd_list); | |
69 | mei_io_list_init(&dev->amthif_rd_complete_list); | |
70 | ||
91f01c6d | 71 | } |
40e0b67b | 72 | EXPORT_SYMBOL_GPL(mei_device_init); |
91f01c6d OW |
73 | |
74 | /** | |
c4d589be | 75 | * mei_start - initializes host and fw to start work. |
91f01c6d OW |
76 | * |
77 | * @dev: the device structure | |
78 | * | |
79 | * returns 0 on success, <0 on failure. | |
80 | */ | |
c4d589be | 81 | int mei_start(struct mei_device *dev) |
91f01c6d | 82 | { |
91f01c6d OW |
83 | mutex_lock(&dev->device_lock); |
84 | ||
91f01c6d | 85 | /* acknowledge interrupt and stop interupts */ |
3a65dd4e | 86 | mei_clear_interrupts(dev); |
91f01c6d | 87 | |
e7e0c231 | 88 | mei_hw_config(dev); |
24aadc80 | 89 | |
91f01c6d OW |
90 | dev_dbg(&dev->pdev->dev, "reset in start the mei device.\n"); |
91 | ||
92 | mei_reset(dev, 1); | |
93 | ||
9b0d5efc TW |
94 | if (mei_hbm_start_wait(dev)) { |
95 | dev_err(&dev->pdev->dev, "HBM haven't started"); | |
e7e0c231 | 96 | goto err; |
91f01c6d OW |
97 | } |
98 | ||
e7e0c231 TW |
99 | if (!mei_host_is_ready(dev)) { |
100 | dev_err(&dev->pdev->dev, "host is not ready.\n"); | |
101 | goto err; | |
102 | } | |
91f01c6d | 103 | |
827eef51 | 104 | if (!mei_hw_is_ready(dev)) { |
e7e0c231 TW |
105 | dev_err(&dev->pdev->dev, "ME is not ready.\n"); |
106 | goto err; | |
91f01c6d OW |
107 | } |
108 | ||
109 | if (dev->version.major_version != HBM_MAJOR_VERSION || | |
110 | dev->version.minor_version != HBM_MINOR_VERSION) { | |
111 | dev_dbg(&dev->pdev->dev, "MEI start failed.\n"); | |
e7e0c231 | 112 | goto err; |
91f01c6d OW |
113 | } |
114 | ||
91f01c6d | 115 | dev_dbg(&dev->pdev->dev, "link layer has been established.\n"); |
91f01c6d | 116 | |
91f01c6d | 117 | mutex_unlock(&dev->device_lock); |
e7e0c231 TW |
118 | return 0; |
119 | err: | |
120 | dev_err(&dev->pdev->dev, "link layer initialization failed.\n"); | |
121 | dev->dev_state = MEI_DEV_DISABLED; | |
122 | mutex_unlock(&dev->device_lock); | |
123 | return -ENODEV; | |
91f01c6d | 124 | } |
40e0b67b | 125 | EXPORT_SYMBOL_GPL(mei_start); |
91f01c6d | 126 | |
91f01c6d OW |
127 | /** |
128 | * mei_reset - resets host and fw. | |
129 | * | |
130 | * @dev: the device structure | |
131 | * @interrupts_enabled: if interrupt should be enabled after reset. | |
132 | */ | |
133 | void mei_reset(struct mei_device *dev, int interrupts_enabled) | |
134 | { | |
91f01c6d OW |
135 | bool unexpected; |
136 | ||
b210d750 TW |
137 | unexpected = (dev->dev_state != MEI_DEV_INITIALIZING && |
138 | dev->dev_state != MEI_DEV_DISABLED && | |
139 | dev->dev_state != MEI_DEV_POWER_DOWN && | |
140 | dev->dev_state != MEI_DEV_POWER_UP); | |
91f01c6d | 141 | |
91f01c6d OW |
142 | mei_hw_reset(dev, interrupts_enabled); |
143 | ||
9b0d5efc | 144 | dev->hbm_state = MEI_HBM_IDLE; |
91f01c6d | 145 | |
b210d750 TW |
146 | if (dev->dev_state != MEI_DEV_INITIALIZING) { |
147 | if (dev->dev_state != MEI_DEV_DISABLED && | |
148 | dev->dev_state != MEI_DEV_POWER_DOWN) | |
149 | dev->dev_state = MEI_DEV_RESETING; | |
91f01c6d | 150 | |
074b4c01 TW |
151 | mei_cl_all_disconnect(dev); |
152 | ||
91f01c6d | 153 | /* remove entry if already in list */ |
ff8b2f4e | 154 | dev_dbg(&dev->pdev->dev, "remove iamthif and wd from the file list.\n"); |
90e0b5f1 | 155 | mei_cl_unlink(&dev->wd_cl); |
781d0d89 TW |
156 | if (dev->open_handle_count > 0) |
157 | dev->open_handle_count--; | |
90e0b5f1 | 158 | mei_cl_unlink(&dev->iamthif_cl); |
781d0d89 TW |
159 | if (dev->open_handle_count > 0) |
160 | dev->open_handle_count--; | |
91f01c6d | 161 | |
19838fb8 | 162 | mei_amthif_reset_params(dev); |
5fb54fb4 | 163 | memset(&dev->wr_ext_msg, 0, sizeof(dev->wr_ext_msg)); |
91f01c6d OW |
164 | } |
165 | ||
cf9673da | 166 | dev->me_clients_num = 0; |
91f01c6d | 167 | dev->rd_msg_hdr = 0; |
eb9af0ac | 168 | dev->wd_pending = false; |
91f01c6d | 169 | |
91f01c6d | 170 | if (unexpected) |
b210d750 TW |
171 | dev_warn(&dev->pdev->dev, "unexpected reset: dev_state = %s\n", |
172 | mei_dev_state_str(dev->dev_state)); | |
91f01c6d | 173 | |
aafae7ec TW |
174 | if (!interrupts_enabled) { |
175 | dev_dbg(&dev->pdev->dev, "intr not enabled end of reset\n"); | |
176 | return; | |
177 | } | |
178 | ||
179 | mei_hw_start(dev); | |
180 | ||
181 | dev_dbg(&dev->pdev->dev, "link is established start sending messages.\n"); | |
182 | /* link is established * start sending messages. */ | |
183 | ||
184 | dev->dev_state = MEI_DEV_INIT_CLIENTS; | |
185 | ||
186 | mei_hbm_start_req(dev); | |
187 | ||
074b4c01 TW |
188 | /* wake up all readings so they can be interrupted */ |
189 | mei_cl_all_read_wakeup(dev); | |
190 | ||
91f01c6d | 191 | /* remove all waiting requests */ |
074b4c01 | 192 | mei_cl_all_write_clear(dev); |
91f01c6d | 193 | } |
40e0b67b | 194 | EXPORT_SYMBOL_GPL(mei_reset); |
91f01c6d | 195 | |
7cb035d9 TW |
196 | void mei_stop(struct mei_device *dev) |
197 | { | |
198 | dev_dbg(&dev->pdev->dev, "stopping the device.\n"); | |
199 | ||
200 | mutex_lock(&dev->device_lock); | |
201 | ||
202 | cancel_delayed_work(&dev->timer_work); | |
203 | ||
204 | mei_wd_stop(dev); | |
205 | ||
59fcd7c6 SO |
206 | mei_nfc_host_exit(); |
207 | ||
7cb035d9 TW |
208 | dev->dev_state = MEI_DEV_POWER_DOWN; |
209 | mei_reset(dev, 0); | |
210 | ||
211 | mutex_unlock(&dev->device_lock); | |
212 | ||
213 | flush_scheduled_work(); | |
2e647124 TW |
214 | |
215 | mei_watchdog_unregister(dev); | |
7cb035d9 | 216 | } |
40e0b67b | 217 | EXPORT_SYMBOL_GPL(mei_stop); |
91f01c6d | 218 | |
c1174c0e | 219 | |
91f01c6d | 220 |