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 <dm.h> 9 #include <i2c.h> 10 #include <asm/io.h> 11 #include <asm/arch/cpu.h> 12 #include <asm/arch/soc.h> 13 14 DECLARE_GLOBAL_DATA_PTR; 15 16 /* 17 * Information specific to the DB-88F7040 eval board. We strive to use 18 * DT for such platform specfic configurations. At some point, this 19 * might be removed here and implemented via DT. 20 */ 21 /* IO expander I2C device */ 22 #define I2C_IO_EXP_ADDR 0x21 23 #define I2C_IO_CFG_REG_0 0x6 24 #define I2C_IO_DATA_OUT_REG_0 0x2 25 /* VBus enable */ 26 #define I2C_IO_REG_0_USB_H0_OFF 0 27 #define I2C_IO_REG_0_USB_H1_OFF 1 28 #define I2C_IO_REG_VBUS ((1 << I2C_IO_REG_0_USB_H0_OFF) | \ 29 (1 << I2C_IO_REG_0_USB_H1_OFF)) 30 /* Current limit */ 31 #define I2C_IO_REG_0_USB_H0_CL 4 32 #define I2C_IO_REG_0_USB_H1_CL 5 33 #define I2C_IO_REG_CL ((1 << I2C_IO_REG_0_USB_H0_CL) | \ 34 (1 << I2C_IO_REG_0_USB_H1_CL)) 35 36 static int usb_enabled = 0; 37 38 /* Board specific xHCI dis-/enable code */ 39 40 /* 41 * Set USB VBUS signals (via I2C IO expander/GPIO) as output and set 42 * output value as disabled 43 * 44 * Set USB Current Limit signals (via I2C IO expander/GPIO) as output 45 * and set output value as enabled 46 */ 47 int board_xhci_config(void) 48 { 49 struct udevice *dev; 50 int ret; 51 u8 buf[8]; 52 53 if (of_machine_is_compatible("marvell,armada7040-db")) { 54 /* Configure IO exander PCA9555: 7bit address 0x21 */ 55 ret = i2c_get_chip_for_busnum(0, I2C_IO_EXP_ADDR, 1, &dev); 56 if (ret) { 57 printf("Cannot find PCA9555: %d\n", ret); 58 return 0; 59 } 60 61 /* 62 * Read configuration (direction) and set VBUS pin as output 63 * (reset pin = output) 64 */ 65 ret = dm_i2c_read(dev, I2C_IO_CFG_REG_0, buf, 1); 66 if (ret) { 67 printf("Failed to read IO expander value via I2C\n"); 68 return -EIO; 69 } 70 buf[0] &= ~I2C_IO_REG_VBUS; 71 buf[0] &= ~I2C_IO_REG_CL; 72 ret = dm_i2c_write(dev, I2C_IO_CFG_REG_0, buf, 1); 73 if (ret) { 74 printf("Failed to set IO expander via I2C\n"); 75 return -EIO; 76 } 77 78 /* Read output value and configure it */ 79 ret = dm_i2c_read(dev, I2C_IO_DATA_OUT_REG_0, buf, 1); 80 if (ret) { 81 printf("Failed to read IO expander value via I2C\n"); 82 return -EIO; 83 } 84 buf[0] &= ~I2C_IO_REG_VBUS; 85 buf[0] |= I2C_IO_REG_CL; 86 ret = dm_i2c_write(dev, I2C_IO_DATA_OUT_REG_0, buf, 1); 87 if (ret) { 88 printf("Failed to set IO expander via I2C\n"); 89 return -EIO; 90 } 91 92 mdelay(500); /* required delay to let output value settle */ 93 } 94 95 return 0; 96 } 97 98 int board_xhci_enable(fdt_addr_t base) 99 { 100 struct udevice *dev; 101 int ret; 102 u8 buf[8]; 103 104 if (of_machine_is_compatible("marvell,armada7040-db")) { 105 /* 106 * This function enables all USB ports simultaniously, 107 * it only needs to get called once 108 */ 109 if (usb_enabled) 110 return 0; 111 112 /* Configure IO exander PCA9555: 7bit address 0x21 */ 113 ret = i2c_get_chip_for_busnum(0, I2C_IO_EXP_ADDR, 1, &dev); 114 if (ret) { 115 printf("Cannot find PCA9555: %d\n", ret); 116 return 0; 117 } 118 119 /* Read VBUS output value */ 120 ret = dm_i2c_read(dev, I2C_IO_DATA_OUT_REG_0, buf, 1); 121 if (ret) { 122 printf("Failed to read IO expander value via I2C\n"); 123 return -EIO; 124 } 125 126 /* Enable VBUS power: Set output value of VBUS pin as enabled */ 127 buf[0] |= I2C_IO_REG_VBUS; 128 ret = dm_i2c_write(dev, I2C_IO_DATA_OUT_REG_0, buf, 1); 129 if (ret) { 130 printf("Failed to set IO expander via I2C\n"); 131 return -EIO; 132 } 133 134 mdelay(500); /* required delay to let output value settle */ 135 usb_enabled = 1; 136 } 137 138 return 0; 139 } 140 141 int board_early_init_f(void) 142 { 143 /* Nothing to do (yet), perhaps later some pin-muxing etc */ 144 145 return 0; 146 } 147 148 int board_init(void) 149 { 150 /* adress of boot parameters */ 151 gd->bd->bi_boot_params = CONFIG_SYS_SDRAM_BASE + 0x100; 152 153 return 0; 154 } 155 156 int board_late_init(void) 157 { 158 /* Pre-configure the USB ports (overcurrent, VBus) */ 159 board_xhci_config(); 160 161 return 0; 162 } 163