blob: 2024940cdd83809cd86efba7326b17ce99c526cb [file] [log] [blame]
Ajay Kumar Guptadbea3242010-07-09 11:43:48 +05301/*
2 * am35x.c - TI's AM35x platform specific usb wrapper functions.
3 *
4 * Author: Ajay Kumar Gupta <ajay.gupta@ti.com>
5 *
6 * Based on drivers/usb/musb/da8xx.c
7 *
8 * Copyright (c) 2010 Texas Instruments Incorporated
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 */
24#include <common.h>
25
26#include "am35x.h"
27
28/* MUSB platform configuration */
29struct musb_config musb_cfg = {
30 .regs = (struct musb_regs *)AM35X_USB_OTG_CORE_BASE,
31 .timeout = AM35X_USB_OTG_TIMEOUT,
32 .musb_speed = 0,
33};
34
35/*
36 * Enable the USB phy
37 */
38static u8 phy_on(void)
39{
40 u32 devconf2;
41 u32 timeout;
42
43 devconf2 = readl(&am35x_scm_general_regs->devconf2);
44
45 devconf2 &= ~(DEVCONF2_RESET | DEVCONF2_PHYPWRDN | DEVCONF2_OTGPWRDN |
46 DEVCONF2_OTGMODE | DEVCONF2_REFFREQ |
47 DEVCONF2_PHY_GPIOMODE);
48 devconf2 |= DEVCONF2_SESENDEN | DEVCONF2_VBDTCTEN | DEVCONF2_PHY_PLLON |
49 DEVCONF2_REFFREQ_13MHZ | DEVCONF2_DATPOL;
50
51 writel(devconf2, &am35x_scm_general_regs->devconf2);
52
53 /* wait until the USB phy is turned on */
54 timeout = musb_cfg.timeout;
55 while (timeout--)
56 if (readl(&am35x_scm_general_regs->devconf2) & DEVCONF2_PHYCKGD)
57 return 1;
58
59 /* USB phy was not turned on */
60 return 0;
61}
62
63/*
64 * Disable the USB phy
65 */
66static void phy_off(void)
67{
68 u32 devconf2;
69
70 /*
71 * Power down the on-chip PHY.
72 */
73 devconf2 = readl(&am35x_scm_general_regs->devconf2);
74
75 devconf2 &= ~DEVCONF2_PHY_PLLON;
76 devconf2 |= DEVCONF2_PHYPWRDN | DEVCONF2_OTGPWRDN;
77 writel(devconf2, &am35x_scm_general_regs->devconf2);
78}
79
80/*
81 * This function performs platform specific initialization for usb0.
82 */
83int musb_platform_init(void)
84{
85 u32 revision;
86 u32 sw_reset;
87
88 /* global usb reset */
89 sw_reset = readl(&am35x_scm_general_regs->ip_sw_reset);
90 sw_reset |= (1 << 0);
91 writel(sw_reset, &am35x_scm_general_regs->ip_sw_reset);
92 sw_reset &= ~(1 << 0);
93 writel(sw_reset, &am35x_scm_general_regs->ip_sw_reset);
94
95 /* reset the controller */
96 writel(0x1, &am35x_usb_regs->control);
97 udelay(5000);
98
99 /* start the on-chip usb phy and its pll */
100 if (phy_on() == 0)
101 return -1;
102
103 /* Returns zero if e.g. not clocked */
104 revision = readl(&am35x_usb_regs->revision);
105 if (revision == 0)
106 return -1;
107
108 return 0;
109}
110
111/*
112 * This function performs platform specific deinitialization for usb0.
113 */
114void musb_platform_deinit(void)
115{
116 /* Turn off the phy */
117 phy_off();
118}