2 * Copyright (C) 2016 Stefan Roese <sr@denx.de>
4 * SPDX-License-Identifier: GPL-2.0+
10 #include <asm/arch/cpu.h>
11 #include <asm/arch/soc.h>
13 DECLARE_GLOBAL_DATA_PTR;
15 /* IO expander I2C device */
16 #define I2C_IO_EXP_ADDR 0x22
17 #define I2C_IO_CFG_REG_0 0x6
18 #define I2C_IO_DATA_OUT_REG_0 0x2
19 #define I2C_IO_REG_0_SATA_OFF 2
20 #define I2C_IO_REG_0_USB_H_OFF 1
22 int board_early_init_f(void)
24 /* Nothing to do (yet), perhaps later some pin-muxing etc */
31 /* adress of boot parameters */
32 gd->bd->bi_boot_params = CONFIG_SYS_SDRAM_BASE + 0x100;
37 /* Board specific AHCI / SATA enable code */
38 int board_ahci_enable(void)
44 /* Configure IO exander PCA9555: 7bit address 0x22 */
45 ret = i2c_get_chip_for_busnum(0, I2C_IO_EXP_ADDR, 1, &dev);
47 printf("Cannot find PCA9555: %d\n", ret);
51 ret = dm_i2c_read(dev, I2C_IO_CFG_REG_0, buf, 1);
53 printf("Failed to read IO expander value via I2C\n");
58 * Enable SATA power via IO expander connected via I2C by setting
59 * the corresponding bit to output mode to enable power for SATA
61 buf[0] &= ~(1 << I2C_IO_REG_0_SATA_OFF);
62 ret = dm_i2c_write(dev, I2C_IO_CFG_REG_0, buf, 1);
64 printf("Failed to set IO expander via I2C\n");
71 /* Board specific xHCI enable code */
72 int board_xhci_enable(void)
78 /* Configure IO exander PCA9555: 7bit address 0x22 */
79 ret = i2c_get_chip_for_busnum(0, I2C_IO_EXP_ADDR, 1, &dev);
81 printf("Cannot find PCA9555: %d\n", ret);
85 printf("Enable USB VBUS\n");
88 * Read configuration (direction) and set VBUS pin as output
89 * (reset pin = output)
91 ret = dm_i2c_read(dev, I2C_IO_CFG_REG_0, buf, 1);
93 printf("Failed to read IO expander value via I2C\n");
96 buf[0] &= ~(1 << I2C_IO_REG_0_USB_H_OFF);
97 ret = dm_i2c_write(dev, I2C_IO_CFG_REG_0, buf, 1);
99 printf("Failed to set IO expander via I2C\n");
103 /* Read VBUS output value and disable it */
104 ret = dm_i2c_read(dev, I2C_IO_DATA_OUT_REG_0, buf, 1);
106 printf("Failed to read IO expander value via I2C\n");
109 buf[0] &= ~(1 << I2C_IO_REG_0_USB_H_OFF);
110 ret = dm_i2c_write(dev, I2C_IO_DATA_OUT_REG_0, buf, 1);
112 printf("Failed to set IO expander via I2C\n");
117 * Required delay for configuration to settle - must wait for
118 * power on port is disabled in case VBUS signal was high,
119 * required 3 seconds delay to let VBUS signal fully settle down
123 /* Enable VBUS power: Set output value of VBUS pin as enabled */
124 buf[0] |= (1 << I2C_IO_REG_0_USB_H_OFF);
125 ret = dm_i2c_write(dev, I2C_IO_DATA_OUT_REG_0, buf, 1);
127 printf("Failed to set IO expander via I2C\n");
131 mdelay(500); /* required delay to let output value settle */