summaryrefslogtreecommitdiffstats
path: root/drivers/usb/musb/da8xx.c
blob: 617d88e1a70c4d9efcc31960292a08f4982a72df (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
/*
 * da8xx.c - TI's DA8xx platform specific usb wrapper functions.
 *
 * Author: Ajay Kumar Gupta <ajay.gupta@ti.com>
 *
 * Based on drivers/usb/musb/davinci.c
 *
 * Copyright (C) 2009 Texas Instruments Incorporated
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include <common.h>

#include "da8xx.h"

/* MUSB platform configuration */
struct musb_config musb_cfg = {
	.regs		= (struct musb_regs *)DA8XX_USB_OTG_CORE_BASE,
	.timeout	= DA8XX_USB_OTG_TIMEOUT,
	.musb_speed	= 0,
};

/*
 * This function enables VBUS by driving the GPIO Bank4 Pin 15 high.
 */
static void enable_vbus(void)
{
	u32 value;

	/* configure GPIO bank4 pin 15 in output direction */
	value = readl(&davinci_gpio_bank45->dir);
	writel((value & (~DA8XX_USB_VBUS_GPIO)), &davinci_gpio_bank45->dir);

	/* set GPIO bank4 pin 15 high to drive VBUS */
	value = readl(&davinci_gpio_bank45->set_data);
	writel((value | DA8XX_USB_VBUS_GPIO), &davinci_gpio_bank45->set_data);
}

/*
 * Enable the usb0 phy. This initialization procedure is explained in
 * the DA8xx USB user guide document.
 */
static u8 phy_on(void)
{
	u32 timeout;
	u32 cfgchip2;

	cfgchip2 = readl(&davinci_syscfg_regs->cfgchip2);

	cfgchip2 &= ~(CFGCHIP2_RESET | CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN |
		      CFGCHIP2_OTGMODE | CFGCHIP2_REFFREQ);
	cfgchip2 |= CFGCHIP2_SESENDEN | CFGCHIP2_VBDTCTEN | CFGCHIP2_PHY_PLLON |
		    CFGCHIP2_REFFREQ_24MHZ;

	writel(cfgchip2, &davinci_syscfg_regs->cfgchip2);

	/* wait until the usb phy pll locks */
	timeout = musb_cfg.timeout;
	while (timeout--)
		if (readl(&davinci_syscfg_regs->cfgchip2) & CFGCHIP2_PHYCLKGD)
			return 1;

	/* USB phy was not turned on */
	return 0;
}

/*
 * Disable the usb phy
 */
static void phy_off(void)
{
	u32 cfgchip2;

	/*
	 * Power down the on-chip PHY.
	 */
	cfgchip2 = readl(&davinci_syscfg_regs->cfgchip2);
	cfgchip2 &= ~CFGCHIP2_PHY_PLLON;
	cfgchip2 |= CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN;
	writel(cfgchip2, &davinci_syscfg_regs->cfgchip2);
}

/*
 * This function performs DA8xx platform specific initialization for usb0.
 */
int musb_platform_init(void)
{
	u32  revision;

	/* enable psc for usb2.0 */
	lpsc_on(33);

	/* enable usb vbus */
	enable_vbus();

	/* reset the controller */
	writel(0x1, &da8xx_usb_regs->control);
	udelay(5000);

	/* start the on-chip usb phy and its pll */
	if (phy_on() == 0)
		return -1;

	/* Returns zero if e.g. not clocked */
	revision = readl(&da8xx_usb_regs->revision);
	if (revision == 0)
		return -1;

	/* Disable all interrupts */
	writel((DA8XX_USB_USBINT_MASK | DA8XX_USB_TXINT_MASK |
		DA8XX_USB_RXINT_MASK), &da8xx_usb_regs->intmsk_set);
	return 0;
}

/*
 * This function performs DA8xx platform specific deinitialization for usb0.
 */
void musb_platform_deinit(void)
{
	/* Turn of the phy */
	phy_off();

	/* flush any interrupts */
	writel((DA8XX_USB_USBINT_MASK | DA8XX_USB_TXINT_MASK |
		DA8XX_USB_RXINT_MASK), &da8xx_usb_regs->intmsk_clr);
	writel(0, &da8xx_usb_regs->eoi);
}
OpenPOWER on IntegriCloud