1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (c) 2009 Wind River Systems, Inc.
4 * Tom Rix <Tom.Rix@windriver.com>
5 *
6 * This is file is based on
7 * repository git.gitorious.org/u-boot-omap3/mainline.git,
8 * branch omap3-dev-usb, file drivers/usb/gadget/twl4030_usb.c
9 *
10 * This is the unique part of its copyright :
11 *
12 * ------------------------------------------------------------------------
13 *
14 * * (C) Copyright 2009 Atin Malaviya (atin.malaviya@gmail.com)
15 *
16 * Based on: twl4030_usb.c in linux 2.6 (drivers/i2c/chips/twl4030_usb.c)
17 * Copyright (C) 2004-2007 Texas Instruments
18 * Copyright (C) 2008 Nokia Corporation
19 * Contact: Felipe Balbi <felipe.balbi@nokia.com>
20 *
21 * Author: Atin Malaviya (atin.malaviya@gmail.com)
22 *
23 * ------------------------------------------------------------------------
24 */
25
26 #include <twl4030.h>
27
28 /* Defines for bits in registers */
29 #define OPMODE_MASK (3 << 3)
30 #define XCVRSELECT_MASK (3 << 0)
31 #define CARKITMODE (1 << 2)
32 #define OTG_ENAB (1 << 5)
33 #define PHYPWD (1 << 0)
34 #define CLOCKGATING_EN (1 << 2)
35 #define CLK32K_EN (1 << 1)
36 #define REQ_PHY_DPLL_CLK (1 << 0)
37 #define PHY_DPLL_CLK (1 << 0)
38
twl4030_usb_write(u8 address,u8 data)39 static int twl4030_usb_write(u8 address, u8 data)
40 {
41 int ret;
42
43 ret = twl4030_i2c_write_u8(TWL4030_CHIP_USB, address, data);
44 if (ret != 0)
45 printf("TWL4030:USB:Write[0x%x] Error %d\n", address, ret);
46
47 return ret;
48 }
49
twl4030_usb_read(u8 address)50 static int twl4030_usb_read(u8 address)
51 {
52 u8 data;
53 int ret;
54
55 ret = twl4030_i2c_read_u8(TWL4030_CHIP_USB, address, &data);
56 if (ret == 0)
57 ret = data;
58 else
59 printf("TWL4030:USB:Read[0x%x] Error %d\n", address, ret);
60
61 return ret;
62 }
63
twl4030_usb_ldo_init(void)64 static void twl4030_usb_ldo_init(void)
65 {
66 /* Enable writing to power configuration registers */
67 twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER,
68 TWL4030_PM_MASTER_PROTECT_KEY, 0xC0);
69 twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER,
70 TWL4030_PM_MASTER_PROTECT_KEY, 0x0C);
71
72 /* put VUSB3V1 LDO in active state */
73 twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
74 TWL4030_PM_RECEIVER_VUSB_DEDICATED2, 0x00);
75
76 /* input to VUSB3V1 LDO is from VBAT, not VBUS */
77 twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
78 TWL4030_PM_RECEIVER_VUSB_DEDICATED1, 0x14);
79
80 /* turn on 3.1V regulator */
81 twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
82 TWL4030_PM_RECEIVER_VUSB3V1_DEV_GRP, 0x20);
83 twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
84 TWL4030_PM_RECEIVER_VUSB3V1_TYPE, 0x00);
85
86 /* turn on 1.5V regulator */
87 twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
88 TWL4030_PM_RECEIVER_VUSB1V5_DEV_GRP, 0x20);
89 twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
90 TWL4030_PM_RECEIVER_VUSB1V5_TYPE, 0x00);
91
92 /* turn on 1.8V regulator */
93 twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
94 TWL4030_PM_RECEIVER_VUSB1V8_DEV_GRP, 0x20);
95 twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
96 TWL4030_PM_RECEIVER_VUSB1V8_TYPE, 0x00);
97
98 /* disable access to power configuration registers */
99 twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER,
100 TWL4030_PM_MASTER_PROTECT_KEY, 0x00);
101 }
102
twl4030_phy_power(void)103 static void twl4030_phy_power(void)
104 {
105 u8 pwr, clk;
106
107 /* Power the PHY */
108 pwr = twl4030_usb_read(TWL4030_USB_PHY_PWR_CTRL);
109 pwr &= ~PHYPWD;
110 twl4030_usb_write(TWL4030_USB_PHY_PWR_CTRL, pwr);
111 /* Enable clocks */
112 clk = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL);
113 clk |= CLOCKGATING_EN | CLK32K_EN;
114 twl4030_usb_write(TWL4030_USB_PHY_CLK_CTRL, clk);
115 }
116
117 /*
118 * Initiaze the ULPI interface
119 * ULPI : Universal Transceiver Macrocell Low Pin Interface
120 * An interface between the USB link controller like musb and the
121 * the PHY or transceiver that drives the actual bus.
122 */
twl4030_usb_ulpi_init(void)123 int twl4030_usb_ulpi_init(void)
124 {
125 long timeout = 1000 * 1000; /* 1 sec */;
126 u8 clk, sts, pwr;
127
128 /* twl4030 ldo init */
129 twl4030_usb_ldo_init();
130
131 /* Enable the twl4030 phy */
132 twl4030_phy_power();
133
134 /* Enable DPLL to access PHY registers over I2C */
135 clk = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL);
136 clk |= REQ_PHY_DPLL_CLK;
137 twl4030_usb_write(TWL4030_USB_PHY_CLK_CTRL, clk);
138
139 /* Check if the PHY DPLL is locked */
140 sts = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL_STS);
141 while (!(sts & PHY_DPLL_CLK) && 0 < timeout) {
142 udelay(10);
143 sts = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL_STS);
144 timeout -= 10;
145 }
146
147 /* Final check */
148 sts = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL_STS);
149 if (!(sts & PHY_DPLL_CLK)) {
150 printf("Error:TWL4030:USB Timeout setting PHY DPLL clock\n");
151 return -1;
152 }
153
154 /*
155 * There are two circuit blocks attached to the PHY,
156 * Carkit and USB OTG. Disable Carkit and enable USB OTG
157 */
158 twl4030_usb_write(TWL4030_USB_IFC_CTRL_CLR, CARKITMODE);
159 pwr = twl4030_usb_read(TWL4030_USB_POWER_CTRL);
160 pwr |= OTG_ENAB;
161 twl4030_usb_write(TWL4030_USB_POWER_CTRL_SET, pwr);
162
163 /* Clear the opmode bits to ensure normal encode */
164 twl4030_usb_write(TWL4030_USB_FUNC_CTRL_CLR, OPMODE_MASK);
165
166 /* Clear the xcvrselect bits to enable the high speed transeiver */
167 twl4030_usb_write(TWL4030_USB_FUNC_CTRL_CLR, XCVRSELECT_MASK);
168
169 /* Let ULPI control the DPLL clock */
170 clk = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL);
171 clk &= ~REQ_PHY_DPLL_CLK;
172 twl4030_usb_write(TWL4030_USB_PHY_CLK_CTRL, clk);
173
174 return 0;
175 }
176