aboutsummaryrefslogtreecommitdiffstats
path: root/payloads/libpayload/drivers/usb/dwc2_rh.c
blob: 3dd504279bc46547ce4117c6aa24cf32908b7dd0 (plain)
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
184
185
186
187
188
/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2014 Rockchip Electronics
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */


#include <usb/usb.h>
#include "generic_hub.h"
#include "dwc2_private.h"
#include "dwc2.h"

static int
dwc2_rh_port_status_changed(usbdev_t *const dev, const int port)
{
	hprt_t hprt;
	int changed;
	dwc_ctrl_t *const dwc2 = DWC2_INST(dev->controller);

	hprt.d32 = readl(dwc2->hprt0);
	changed = hprt.prtconndet;

	/* Clear connect detect flag */
	if (changed) {
		hprt.d32 &= HPRT_W1C_MASK;
		hprt.prtconndet = 1;
		writel(hprt.d32, dwc2->hprt0);
	}
	return changed;
}

static int
dwc2_rh_port_connected(usbdev_t *const dev, const int port)
{
	hprt_t hprt;
	dwc_ctrl_t *const dwc2 = DWC2_INST(dev->controller);

	hprt.d32 = readl(dwc2->hprt0);
	return hprt.prtconnsts;
}

static int
dwc2_rh_port_in_reset(usbdev_t *const dev, const int port)
{
	hprt_t hprt;
	dwc_ctrl_t *const dwc2 = DWC2_INST(dev->controller);

	hprt.d32 = readl(dwc2->hprt0);
	return hprt.prtrst;
}

static int
dwc2_rh_port_enabled(usbdev_t *const dev, const int port)
{
	hprt_t hprt;
	dwc_ctrl_t *const dwc2 = DWC2_INST(dev->controller);

	hprt.d32 = readl(dwc2->hprt0);
	return hprt.prtena;
}

static usb_speed
dwc2_rh_port_speed(usbdev_t *const dev, const int port)
{
	hprt_t hprt;
	dwc_ctrl_t *const dwc2 = DWC2_INST(dev->controller);

	hprt.d32 = readl(dwc2->hprt0);
	if (hprt.prtena) {
		switch (hprt.prtspd) {
		case PRTSPD_HIGH:
			return HIGH_SPEED;
		case PRTSPD_FULL:
			return FULL_SPEED;
		case PRTSPD_LOW:
			return LOW_SPEED;
		}
	}
	return -1;
}

static int
dwc2_rh_reset_port(usbdev_t *const dev, const int port)
{
	hprt_t hprt;
	dwc_ctrl_t *const dwc2 = DWC2_INST(dev->controller);

	hprt.d32 = readl(dwc2->hprt0);
	hprt.d32 &= HPRT_W1C_MASK;
	hprt.prtrst = 1;
	writel(hprt.d32, dwc2->hprt0);

	/* Wait a bit while reset is active. */
	mdelay(50);

	/* Deassert reset. */
	hprt.prtrst = 0;
	writel(hprt.d32, dwc2->hprt0);

	/*
	 * If reset and speed enum success the DWC2 core will set enable bit
	 * after port reset bit is deasserted
	 */
	mdelay(1);
	hprt.d32 = readl(dwc2->hprt0);
	usb_debug("%s reset port ok, hprt = 0x%08x\n", __func__, hprt.d32);

	if (!hprt.prtena) {
		usb_debug("%s enable port fail! hprt = 0x%08x\n",
			  __func__, hprt.d32);
		return -1;
	}

	return 0;
}

static int
dwc2_rh_enable_port(usbdev_t *const dev, const int port)
{
	hprt_t hprt;
	dwc_ctrl_t *const dwc2 = DWC2_INST(dev->controller);

	/* Power on the port */
	hprt.d32 = readl(dwc2->hprt0);
	hprt.d32 &= HPRT_W1C_MASK;
	hprt.prtpwr = 1;
	writel(hprt.d32, dwc2->hprt0);
	return 0;
}

static int
dwc2_rh_disable_port(usbdev_t *const dev, const int port)
{
	hprt_t hprt;
	dwc_ctrl_t *const dwc2 = DWC2_INST(dev->controller);

	hprt.d32 = readl(dwc2->hprt0);
	hprt.d32 &= HPRT_W1C_MASK;
	/* Disable the port*/
	hprt.prtena = 1;
	/* Power off the port */
	hprt.prtpwr = 0;
	writel(hprt.d32, dwc2->hprt0);
	return 0;
}

static const generic_hub_ops_t dwc2_rh_ops = {
	.hub_status_changed	= NULL,
	.port_status_changed	= dwc2_rh_port_status_changed,
	.port_connected		= dwc2_rh_port_connected,
	.port_in_reset		= dwc2_rh_port_in_reset,
	.port_enabled		= dwc2_rh_port_enabled,
	.port_speed		= dwc2_rh_port_speed,
	.enable_port		= dwc2_rh_enable_port,
	.disable_port		= dwc2_rh_disable_port,
	.start_port_reset	= NULL,
	.reset_port		= dwc2_rh_reset_port,
};

void
dwc2_rh_init(usbdev_t *dev)
{
	dwc_ctrl_t *const dwc2 = DWC2_INST(dev->controller);

	/* we can set them here because a root hub _really_ shouldn't
	   appear elsewhere */
	dev->address = 0;
	dev->hub = -1;
	dev->port = -1;

	generic_hub_init(dev, 1, &dwc2_rh_ops);
	usb_debug("dwc2_rh_init HPRT 0x%08x p = %p\n ",
		  readl(dwc2->hprt0), dwc2->hprt0);
	usb_debug("DWC2: root hub init done\n");
}