1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
/*
* otg.c - ChipIdea USB IP core OTG driver
*
* Copyright (C) 2013-2014 Freescale Semiconductor, Inc.
*
* Author: Peter Chen
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
/*
* This file mainly handles otgsc register, OTG fsm operations for HNP and SRP
* are also included.
*/
#include <linux/usb/otg.h>
#include <linux/usb/gadget.h>
#include <linux/usb/hcd.h>
#include <linux/usb/chipidea.h>
#include "ci.h"
#include "bits.h"
#include "otg.h"
#include "otg_fsm.h"
/**
* hw_read_otgsc returns otgsc register bits value.
* @mask: bitfield mask
*/
u32 hw_read_otgsc(struct ci_hdrc *ci, u32 mask)
{
return hw_read(ci, OP_OTGSC, mask);
}
/**
* hw_write_otgsc updates target bits of OTGSC register.
* @mask: bitfield mask
* @data: to be written
*/
void hw_write_otgsc(struct ci_hdrc *ci, u32 mask, u32 data)
{
hw_write(ci, OP_OTGSC, mask | OTGSC_INT_STATUS_BITS, data);
}
/**
* ci_otg_role - pick role based on ID pin state
* @ci: the controller
*/
enum ci_role ci_otg_role(struct ci_hdrc *ci)
{
enum ci_role role = hw_read_otgsc(ci, OTGSC_ID)
? CI_ROLE_GADGET
: CI_ROLE_HOST;
return role;
}
void ci_handle_vbus_connected(struct ci_hdrc *ci)
{
u32 otgsc;
/*
* TODO: if the platform does not supply 5v to udc, or use other way
* to supply 5v, it needs to use other conditions to call
* usb_gadget_vbus_connect.
*/
if (!ci->is_otg)
return;
otgsc = hw_read(ci, OP_OTGSC, ~0);
if (otgsc & OTGSC_BSV)
usb_gadget_vbus_connect(&ci->gadget);
}
void ci_handle_vbus_change(struct ci_hdrc *ci)
{
if (!ci->is_otg)
return;
if (hw_read_otgsc(ci, OTGSC_BSV))
usb_gadget_vbus_connect(&ci->gadget);
else
usb_gadget_vbus_disconnect(&ci->gadget);
}
#define CI_VBUS_STABLE_TIMEOUT_MS 5000
static void ci_handle_id_switch(struct ci_hdrc *ci)
{
enum ci_role role = ci_otg_role(ci);
struct usb_device *roothub;
int i;
if (role != ci->role) {
dev_dbg(ci->dev, "switching from %s to %s\n",
ci_role(ci)->name, ci->roles[role]->name);
if ((ci->role == CI_ROLE_HOST) && ci->hcd) {
roothub = ci->hcd->self.root_hub;
for (i = 0; i < roothub->maxchild; ++i) {
while (usb_hub_find_child(roothub, (i + 1))) {
enable_irq(ci->irq);
usleep_range(10000, 15000);
disable_irq_nosync(ci->irq);
}
}
}
ci_role_stop(ci);
/* wait vbus lower than OTGSC_BSV */
hw_wait_reg(ci, OP_OTGSC, OTGSC_BSV, 0,
CI_VBUS_STABLE_TIMEOUT_MS);
ci_role_start(ci, role);
}
}
/**
* ci_otg_work - perform otg (vbus/id) event handle
* @work: work struct
*/
static void ci_otg_work(struct work_struct *work)
{
struct ci_hdrc *ci = container_of(work, struct ci_hdrc, work);
if (ci_otg_is_fsm_mode(ci) && !ci_otg_fsm_work(ci)) {
enable_irq(ci->irq);
return;
}
if (ci->id_event) {
ci->id_event = false;
/* Keep controller active during id switch */
pm_runtime_get_sync(ci->dev);
ci_handle_id_switch(ci);
pm_runtime_put_sync(ci->dev);
} else if (ci->b_sess_valid_event) {
ci->b_sess_valid_event = false;
pm_runtime_get_sync(ci->dev);
ci_handle_vbus_change(ci);
pm_runtime_put_sync(ci->dev);
} else
dev_dbg(ci->dev, "it should be quit event\n");
enable_irq(ci->irq);
}
/**
* ci_hdrc_otg_init - initialize otg struct
* ci: the controller
*/
int ci_hdrc_otg_init(struct ci_hdrc *ci)
{
INIT_WORK(&ci->work, ci_otg_work);
ci->wq = create_singlethread_workqueue("ci_otg");
if (!ci->wq) {
dev_err(ci->dev, "can't create workqueue\n");
return -ENODEV;
}
if (ci_otg_is_fsm_mode(ci))
return ci_hdrc_otg_fsm_init(ci);
return 0;
}
/**
* ci_hdrc_otg_destroy - destroy otg struct
* ci: the controller
*/
void ci_hdrc_otg_destroy(struct ci_hdrc *ci)
{
if (ci->wq) {
flush_workqueue(ci->wq);
destroy_workqueue(ci->wq);
}
hw_write_otgsc(ci, OTGSC_INT_EN_BITS | OTGSC_INT_STATUS_BITS,
OTGSC_INT_STATUS_BITS);
if (ci_otg_is_fsm_mode(ci))
ci_hdrc_otg_fsm_remove(ci);
}
|
