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git01.mediatek.com / filogic / uboot / b54835158ee014998c9d9a036053987ac215e40e / . / board / Marvell / mvebu_db-88f7040 / board.c
blob: 48bd55c372ccb2de4825c2b33cd71fe1a4429b18 [file] [log] [blame]
Stefan Roese7be1b9b2016-05-25 08:21:21 +0200[diff] [blame]1/*
2 * Copyright (C) 2016 Stefan Roese <sr@denx.de>
3 *
4 * SPDX-License-Identifier: GPL-2.0+
5 */
6
7#include <common.h>
8#include <i2c.h>
9#include <asm/io.h>
10#include <asm/arch/cpu.h>
11#include <asm/arch/soc.h>
12
13DECLARE_GLOBAL_DATA_PTR;
14
15/* IO expander I2C device */
16#define I2C_IO_EXP_ADDR 0x21
17#define I2C_IO_CFG_REG_0 0x6
18#define I2C_IO_DATA_OUT_REG_0 0x2
19/* VBus enable */
20#define I2C_IO_REG_0_USB_H0_OFF 0
21#define I2C_IO_REG_0_USB_H1_OFF 1
22#define I2C_IO_REG_VBUS ((1 << I2C_IO_REG_0_USB_H0_OFF) | \
23 (1 << I2C_IO_REG_0_USB_H1_OFF))
24/* Current limit */
25#define I2C_IO_REG_0_USB_H0_CL 4
26#define I2C_IO_REG_0_USB_H1_CL 5
27#define I2C_IO_REG_CL ((1 << I2C_IO_REG_0_USB_H0_CL) | \
28 (1 << I2C_IO_REG_0_USB_H1_CL))
29
30static int usb_enabled = 0;
31
32/* Board specific xHCI dis-/enable code */
33
34/*
35 * Set USB VBUS signals (via I2C IO expander/GPIO) as output and set
36 * output value as disabled
37 *
38 * Set USB Current Limit signals (via I2C IO expander/GPIO) as output
39 * and set output value as enabled
40 */
41int board_xhci_config(void)
42{
43 struct udevice *dev;
44 int ret;
45 u8 buf[8];
46
47 /* Configure IO exander PCA9555: 7bit address 0x21 */
48 ret = i2c_get_chip_for_busnum(0, I2C_IO_EXP_ADDR, 1, &dev);
49 if (ret) {
50 printf("Cannot find PCA9555: %d\n", ret);
51 return 0;
52 }
53
54 /*
55 * Read configuration (direction) and set VBUS pin as output
56 * (reset pin = output)
57 */
58 ret = dm_i2c_read(dev, I2C_IO_CFG_REG_0, buf, 1);
59 if (ret) {
60 printf("Failed to read IO expander value via I2C\n");
61 return -EIO;
62 }
63 buf[0] &= ~I2C_IO_REG_VBUS;
64 buf[0] &= ~I2C_IO_REG_CL;
65 ret = dm_i2c_write(dev, I2C_IO_CFG_REG_0, buf, 1);
66 if (ret) {
67 printf("Failed to set IO expander via I2C\n");
68 return -EIO;
69 }
70
71 /* Read output value and configure it */
72 ret = dm_i2c_read(dev, I2C_IO_DATA_OUT_REG_0, buf, 1);
73 if (ret) {
74 printf("Failed to read IO expander value via I2C\n");
75 return -EIO;
76 }
77 buf[0] &= ~I2C_IO_REG_VBUS;
78 buf[0] |= I2C_IO_REG_CL;
79 ret = dm_i2c_write(dev, I2C_IO_DATA_OUT_REG_0, buf, 1);
80 if (ret) {
81 printf("Failed to set IO expander via I2C\n");
82 return -EIO;
83 }
84
85 mdelay(500); /* required delay to let output value settle */
86
87 return 0;
88}
89
90int board_xhci_enable(void)
91{
92 struct udevice *dev;
93 int ret;
94 u8 buf[8];
95
96 /*
97 * This function enables all USB ports simultaniously,
98 * it only needs to get called once
99 */
100 if (usb_enabled)
101 return 0;
102
103 /* Configure IO exander PCA9555: 7bit address 0x21 */
104 ret = i2c_get_chip_for_busnum(0, I2C_IO_EXP_ADDR, 1, &dev);
105 if (ret) {
106 printf("Cannot find PCA9555: %d\n", ret);
107 return 0;
108 }
109
110 /* Read VBUS output value */
111 ret = dm_i2c_read(dev, I2C_IO_DATA_OUT_REG_0, buf, 1);
112 if (ret) {
113 printf("Failed to read IO expander value via I2C\n");
114 return -EIO;
115 }
116
117 /* Enable VBUS power: Set output value of VBUS pin as enabled */
118 buf[0] |= I2C_IO_REG_VBUS;
119 ret = dm_i2c_write(dev, I2C_IO_DATA_OUT_REG_0, buf, 1);
120 if (ret) {
121 printf("Failed to set IO expander via I2C\n");
122 return -EIO;
123 }
124
125 mdelay(500); /* required delay to let output value settle */
126 usb_enabled = 1;
127
128 return 0;
129}
130
131int board_early_init_f(void)
132{
133 /* Nothing to do (yet), perhaps later some pin-muxing etc */
134
135 return 0;
136}
137
138int board_init(void)
139{
140 /* adress of boot parameters */
141 gd->bd->bi_boot_params = CONFIG_SYS_SDRAM_BASE + 0x100;
142
143 return 0;
144}
145
146int board_late_init(void)
147{
148 /* Pre-configure the USB ports (overcurrent, VBus) */
149 board_xhci_config();
150
151 return 0;
152}