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Tom Rixbffbb2a2009-10-31 12:37:40 -05001/*
2 * Copyright (c) 2009 Wind River Systems, Inc.
3 * Tom Rix <Tom.Rix@windriver.com>
4 *
5 * This is file is based on
6 * repository git.gitorious.org/u-boot-omap3/mainline.git,
7 * branch omap3-dev-usb, file drivers/usb/gadget/twl4030_usb.c
8 *
9 * This is the unique part of its copyright :
10 *
11 * ------------------------------------------------------------------------
12 *
13 * * (C) Copyright 2009 Atin Malaviya (atin.malaviya@gmail.com)
14 *
15 * Based on: twl4030_usb.c in linux 2.6 (drivers/i2c/chips/twl4030_usb.c)
16 * Copyright (C) 2004-2007 Texas Instruments
17 * Copyright (C) 2008 Nokia Corporation
18 * Contact: Felipe Balbi <felipe.balbi@nokia.com>
19 *
20 * Author: Atin Malaviya (atin.malaviya@gmail.com)
21 *
22 * ------------------------------------------------------------------------
23 *
24 * This program is free software; you can redistribute it and/or modify
25 * it under the terms of the GNU General Public License as published by
26 * the Free Software Foundation; either version 2 of the License, or
27 * (at your option) any later version.
28 *
29 * This program is distributed in the hope that it will be useful,
30 * but WITHOUT ANY WARRANTY; without even the implied warranty of
31 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
32 * GNU General Public License for more details.
33 *
34 * You should have received a copy of the GNU General Public License
35 * along with this program; if not, write to the Free Software
36 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
37 * MA 02111-1307 USA
38 */
39
40#include <twl4030.h>
41
42/* Defines for bits in registers */
43#define OPMODE_MASK (3 << 3)
44#define XCVRSELECT_MASK (3 << 0)
45#define CARKITMODE (1 << 2)
46#define OTG_ENAB (1 << 5)
47#define PHYPWD (1 << 0)
48#define CLOCKGATING_EN (1 << 2)
49#define CLK32K_EN (1 << 1)
50#define REQ_PHY_DPLL_CLK (1 << 0)
51#define PHY_DPLL_CLK (1 << 0)
52
53static int twl4030_usb_write(u8 address, u8 data)
54{
55 int ret;
56
57 ret = twl4030_i2c_write_u8(TWL4030_CHIP_USB, data, address);
58 if (ret != 0)
59 printf("TWL4030:USB:Write[0x%x] Error %d\n", address, ret);
60
61 return ret;
62}
63
64static int twl4030_usb_read(u8 address)
65{
66 u8 data;
67 int ret;
68
69 ret = twl4030_i2c_read_u8(TWL4030_CHIP_USB, &data, address);
70 if (ret == 0)
71 ret = data;
72 else
73 printf("TWL4030:USB:Read[0x%x] Error %d\n", address, ret);
74
75 return ret;
76}
77
78static void twl4030_usb_ldo_init(void)
79{
80 /* Enable writing to power configuration registers */
81 twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER, 0xC0,
82 TWL4030_PM_MASTER_PROTECT_KEY);
83 twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER, 0x0C,
84 TWL4030_PM_MASTER_PROTECT_KEY);
85
86 /* put VUSB3V1 LDO in active state */
87 twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER, 0x00,
88 TWL4030_PM_RECEIVER_VUSB_DEDICATED2);
89
90 /* input to VUSB3V1 LDO is from VBAT, not VBUS */
91 twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER, 0x14,
92 TWL4030_PM_RECEIVER_VUSB_DEDICATED1);
93
94 /* turn on 3.1V regulator */
95 twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER, 0x20,
96 TWL4030_PM_RECEIVER_VUSB3V1_DEV_GRP);
97 twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER, 0x00,
98 TWL4030_PM_RECEIVER_VUSB3V1_TYPE);
99
100 /* turn on 1.5V regulator */
101 twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER, 0x20,
102 TWL4030_PM_RECEIVER_VUSB1V5_DEV_GRP);
103 twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER, 0x00,
104 TWL4030_PM_RECEIVER_VUSB1V5_TYPE);
105
106 /* turn on 1.8V regulator */
107 twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER, 0x20,
108 TWL4030_PM_RECEIVER_VUSB1V8_DEV_GRP);
109 twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER, 0x00,
110 TWL4030_PM_RECEIVER_VUSB1V8_TYPE);
111
112 /* disable access to power configuration registers */
113 twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER, 0x00,
114 TWL4030_PM_MASTER_PROTECT_KEY);
115}
116
117static void twl4030_phy_power(void)
118{
119 u8 pwr, clk;
120
121 /* Power the PHY */
122 pwr = twl4030_usb_read(TWL4030_USB_PHY_PWR_CTRL);
123 pwr &= ~PHYPWD;
124 twl4030_usb_write(TWL4030_USB_PHY_PWR_CTRL, pwr);
125 /* Enable clocks */
126 clk = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL);
127 clk |= CLOCKGATING_EN | CLK32K_EN;
128 twl4030_usb_write(TWL4030_USB_PHY_CLK_CTRL, clk);
129}
130
131/*
132 * Initiaze the ULPI interface
133 * ULPI : Universal Transceiver Macrocell Low Pin Interface
134 * An interface between the USB link controller like musb and the
135 * the PHY or transceiver that drives the actual bus.
136 */
137int twl4030_usb_ulpi_init(void)
138{
139 long timeout = 1000 * 1000; /* 1 sec */;
140 u8 clk, sts, pwr;
141
142 /* twl4030 ldo init */
143 twl4030_usb_ldo_init();
144
145 /* Enable the twl4030 phy */
146 twl4030_phy_power();
147
148 /* Enable DPLL to access PHY registers over I2C */
149 clk = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL);
150 clk |= REQ_PHY_DPLL_CLK;
151 twl4030_usb_write(TWL4030_USB_PHY_CLK_CTRL, clk);
152
153 /* Check if the PHY DPLL is locked */
154 sts = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL_STS);
155 while (!(sts & PHY_DPLL_CLK) && 0 < timeout) {
156 udelay(10);
157 sts = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL_STS);
158 timeout -= 10;
159 }
160
161 /* Final check */
162 sts = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL_STS);
163 if (!(sts & PHY_DPLL_CLK)) {
164 printf("Error:TWL4030:USB Timeout setting PHY DPLL clock\n");
165 return -1;
166 }
167
168 /*
169 * There are two circuit blocks attached to the PHY,
170 * Carkit and USB OTG. Disable Carkit and enable USB OTG
171 */
172 twl4030_usb_write(TWL4030_USB_IFC_CTRL_CLR, CARKITMODE);
173 pwr = twl4030_usb_read(TWL4030_USB_POWER_CTRL);
174 pwr |= OTG_ENAB;
175 twl4030_usb_write(TWL4030_USB_POWER_CTRL_SET, pwr);
176
177 /* Clear the opmode bits to ensure normal encode */
178 twl4030_usb_write(TWL4030_USB_FUNC_CTRL_CLR, OPMODE_MASK);
179
180 /* Clear the xcvrselect bits to enable the high speed transeiver */
181 twl4030_usb_write(TWL4030_USB_FUNC_CTRL_CLR, XCVRSELECT_MASK);
182
183 /* Let ULPI control the DPLL clock */
184 clk = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL);
185 clk &= ~REQ_PHY_DPLL_CLK;
186 twl4030_usb_write(TWL4030_USB_PHY_CLK_CTRL, clk);
187
188 return 0;
189}