init.c (da0851fe3a8ebc416ab61ce50ef2fb3c3d7375c9) init.c (9b0d5efc421ac79d9a6d97c681eff93288093784)
1/*
2 *
3 * Intel Management Engine Interface (Intel MEI) Linux driver
4 * Copyright (c) 2003-2012, Intel Corporation.
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
1/*
2 *
3 * Intel Management Engine Interface (Intel MEI) Linux driver
4 * Copyright (c) 2003-2012, Intel Corporation.
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/export.h>
17#include <linux/pci.h>
18#include <linux/sched.h>
19#include <linux/wait.h>
20#include <linux/delay.h>
21
22#include <linux/mei.h>
23
24#include "mei_dev.h"
18#include <linux/pci.h>
19#include <linux/sched.h>
20#include <linux/wait.h>
21#include <linux/delay.h>
22
23#include <linux/mei.h>
24
25#include "mei_dev.h"
26#include "hbm.h"
25#include "client.h"
26
27const 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);
27#include "client.h"
28
29const 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);
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
45void mei_device_init(struct mei_device *dev)
46{
47 /* setup our list array */
48 INIT_LIST_HEAD(&dev->file_list);
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
46void mei_device_init(struct mei_device *dev)
47{
48 /* setup our list array */
49 INIT_LIST_HEAD(&dev->file_list);
50 INIT_LIST_HEAD(&dev->device_list);
49 mutex_init(&dev->device_lock);
51 mutex_init(&dev->device_lock);
52 init_waitqueue_head(&dev->wait_hw_ready);
50 init_waitqueue_head(&dev->wait_recvd_msg);
51 init_waitqueue_head(&dev->wait_stop_wd);
52 dev->dev_state = MEI_DEV_INITIALIZING;
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);
53 init_waitqueue_head(&dev->wait_recvd_msg);
54 init_waitqueue_head(&dev->wait_stop_wd);
55 dev->dev_state = MEI_DEV_INITIALIZING;
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);
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
59}
71}
72EXPORT_SYMBOL_GPL(mei_device_init);
60
61/**
73
74/**
62 * mei_hw_init - initializes host and fw to start work.
75 * mei_start - initializes host and fw to start work.
63 *
64 * @dev: the device structure
65 *
66 * returns 0 on success, <0 on failure.
67 */
76 *
77 * @dev: the device structure
78 *
79 * returns 0 on success, <0 on failure.
80 */
68int mei_hw_init(struct mei_device *dev)
81int mei_start(struct mei_device *dev)
69{
82{
70 int ret = 0;
71
72 mutex_lock(&dev->device_lock);
73
74 /* acknowledge interrupt and stop interupts */
75 mei_clear_interrupts(dev);
76
77 mei_hw_config(dev);
78
83 mutex_lock(&dev->device_lock);
84
85 /* acknowledge interrupt and stop interupts */
86 mei_clear_interrupts(dev);
87
88 mei_hw_config(dev);
89
79 dev->recvd_msg = false;
80 dev_dbg(&dev->pdev->dev, "reset in start the mei device.\n");
81
82 mei_reset(dev, 1);
83
90 dev_dbg(&dev->pdev->dev, "reset in start the mei device.\n");
91
92 mei_reset(dev, 1);
93
84 /* wait for ME to turn on ME_RDY */
85 if (!dev->recvd_msg) {
86 mutex_unlock(&dev->device_lock);
87 ret = wait_event_interruptible_timeout(dev->wait_recvd_msg,
88 dev->recvd_msg,
89 mei_secs_to_jiffies(MEI_INTEROP_TIMEOUT));
90 mutex_lock(&dev->device_lock);
91 }
92
93 if (ret <= 0 && !dev->recvd_msg) {
94 dev->dev_state = MEI_DEV_DISABLED;
95 dev_dbg(&dev->pdev->dev,
96 "wait_event_interruptible_timeout failed"
97 "on wait for ME to turn on ME_RDY.\n");
94 if (mei_hbm_start_wait(dev)) {
95 dev_err(&dev->pdev->dev, "HBM haven't started");
98 goto err;
99 }
100
96 goto err;
97 }
98
101
102 if (!mei_host_is_ready(dev)) {
103 dev_err(&dev->pdev->dev, "host is not ready.\n");
104 goto err;
105 }
106
107 if (!mei_hw_is_ready(dev)) {
108 dev_err(&dev->pdev->dev, "ME is not ready.\n");
109 goto err;
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");
115 goto err;
116 }
117
99 if (!mei_host_is_ready(dev)) {
100 dev_err(&dev->pdev->dev, "host is not ready.\n");
101 goto err;
102 }
103
104 if (!mei_hw_is_ready(dev)) {
105 dev_err(&dev->pdev->dev, "ME is not ready.\n");
106 goto err;
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");
112 goto err;
113 }
114
118 dev->recvd_msg = false;
119 dev_dbg(&dev->pdev->dev, "link layer has been established.\n");
120
121 mutex_unlock(&dev->device_lock);
122 return 0;
123err:
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;
128}
115 dev_dbg(&dev->pdev->dev, "link layer has been established.\n");
116
117 mutex_unlock(&dev->device_lock);
118 return 0;
119err:
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;
124}
125EXPORT_SYMBOL_GPL(mei_start);
129
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 */
136void mei_reset(struct mei_device *dev, int interrupts_enabled)
137{
138 bool unexpected;
139
126
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 */
133void mei_reset(struct mei_device *dev, int interrupts_enabled)
134{
135 bool unexpected;
136
140 if (dev->dev_state == MEI_DEV_RECOVERING_FROM_RESET)
141 return;
142
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);
147
148 mei_hw_reset(dev, interrupts_enabled);
149
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);
141
142 mei_hw_reset(dev, interrupts_enabled);
143
144 dev->hbm_state = MEI_HBM_IDLE;
150
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;
155
156 mei_cl_all_disconnect(dev);
157

--- 13 unchanged lines hidden (view full) ---

171 dev->me_clients_num = 0;
172 dev->rd_msg_hdr = 0;
173 dev->wd_pending = false;
174
175 if (unexpected)
176 dev_warn(&dev->pdev->dev, "unexpected reset: dev_state = %s\n",
177 mei_dev_state_str(dev->dev_state));
178
145
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;
150
151 mei_cl_all_disconnect(dev);
152

--- 13 unchanged lines hidden (view full) ---

166 dev->me_clients_num = 0;
167 dev->rd_msg_hdr = 0;
168 dev->wd_pending = false;
169
170 if (unexpected)
171 dev_warn(&dev->pdev->dev, "unexpected reset: dev_state = %s\n",
172 mei_dev_state_str(dev->dev_state));
173
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
179 /* wake up all readings so they can be interrupted */
180 mei_cl_all_read_wakeup(dev);
181
182 /* remove all waiting requests */
183 mei_cl_all_write_clear(dev);
184}
188 /* wake up all readings so they can be interrupted */
189 mei_cl_all_read_wakeup(dev);
190
191 /* remove all waiting requests */
192 mei_cl_all_write_clear(dev);
193}
194EXPORT_SYMBOL_GPL(mei_reset);
185
186void mei_stop(struct mei_device *dev)
187{
188 dev_dbg(&dev->pdev->dev, "stopping the device.\n");
189
190 mutex_lock(&dev->device_lock);
191
192 cancel_delayed_work(&dev->timer_work);
193
194 mei_wd_stop(dev);
195
195
196void 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
206 mei_nfc_host_exit();
207
196 dev->dev_state = MEI_DEV_POWER_DOWN;
197 mei_reset(dev, 0);
198
199 mutex_unlock(&dev->device_lock);
200
201 flush_scheduled_work();
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();
214
215 mei_watchdog_unregister(dev);
202}
216}
217EXPORT_SYMBOL_GPL(mei_stop);
203
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