162 lines
3.7 KiB
C
162 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2016 Stefan Roese <sr@denx.de>
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*/
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#include <common.h>
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#include <dm.h>
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#include <i2c.h>
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#include <asm/io.h>
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#include <asm/arch/cpu.h>
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#include <asm/arch/soc.h>
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DECLARE_GLOBAL_DATA_PTR;
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/*
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* Information specific to the DB-88F7040 eval board. We strive to use
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* DT for such platform specfic configurations. At some point, this
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* might be removed here and implemented via DT.
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*/
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/* IO expander I2C device */
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#define I2C_IO_EXP_ADDR 0x21
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#define I2C_IO_CFG_REG_0 0x6
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#define I2C_IO_DATA_OUT_REG_0 0x2
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/* VBus enable */
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#define I2C_IO_REG_0_USB_H0_OFF 0
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#define I2C_IO_REG_0_USB_H1_OFF 1
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#define I2C_IO_REG_VBUS ((1 << I2C_IO_REG_0_USB_H0_OFF) | \
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(1 << I2C_IO_REG_0_USB_H1_OFF))
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/* Current limit */
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#define I2C_IO_REG_0_USB_H0_CL 4
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#define I2C_IO_REG_0_USB_H1_CL 5
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#define I2C_IO_REG_CL ((1 << I2C_IO_REG_0_USB_H0_CL) | \
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(1 << I2C_IO_REG_0_USB_H1_CL))
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static int usb_enabled = 0;
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/* Board specific xHCI dis-/enable code */
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/*
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* Set USB VBUS signals (via I2C IO expander/GPIO) as output and set
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* output value as disabled
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*
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* Set USB Current Limit signals (via I2C IO expander/GPIO) as output
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* and set output value as enabled
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*/
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int board_xhci_config(void)
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{
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struct udevice *dev;
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int ret;
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u8 buf[8];
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if (of_machine_is_compatible("marvell,armada7040-db")) {
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/* Configure IO exander PCA9555: 7bit address 0x21 */
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ret = i2c_get_chip_for_busnum(0, I2C_IO_EXP_ADDR, 1, &dev);
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if (ret) {
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printf("Cannot find PCA9555: %d\n", ret);
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return 0;
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}
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/*
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* Read configuration (direction) and set VBUS pin as output
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* (reset pin = output)
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*/
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ret = dm_i2c_read(dev, I2C_IO_CFG_REG_0, buf, 1);
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if (ret) {
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printf("Failed to read IO expander value via I2C\n");
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return -EIO;
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}
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buf[0] &= ~I2C_IO_REG_VBUS;
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buf[0] &= ~I2C_IO_REG_CL;
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ret = dm_i2c_write(dev, I2C_IO_CFG_REG_0, buf, 1);
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if (ret) {
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printf("Failed to set IO expander via I2C\n");
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return -EIO;
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}
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/* Read output value and configure it */
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ret = dm_i2c_read(dev, I2C_IO_DATA_OUT_REG_0, buf, 1);
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if (ret) {
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printf("Failed to read IO expander value via I2C\n");
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return -EIO;
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}
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buf[0] &= ~I2C_IO_REG_VBUS;
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buf[0] |= I2C_IO_REG_CL;
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ret = dm_i2c_write(dev, I2C_IO_DATA_OUT_REG_0, buf, 1);
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if (ret) {
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printf("Failed to set IO expander via I2C\n");
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return -EIO;
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}
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mdelay(500); /* required delay to let output value settle */
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}
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return 0;
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}
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int board_xhci_enable(fdt_addr_t base)
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{
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struct udevice *dev;
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int ret;
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u8 buf[8];
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if (of_machine_is_compatible("marvell,armada7040-db")) {
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/*
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* This function enables all USB ports simultaniously,
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* it only needs to get called once
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*/
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if (usb_enabled)
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return 0;
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/* Configure IO exander PCA9555: 7bit address 0x21 */
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ret = i2c_get_chip_for_busnum(0, I2C_IO_EXP_ADDR, 1, &dev);
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if (ret) {
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printf("Cannot find PCA9555: %d\n", ret);
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return 0;
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}
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/* Read VBUS output value */
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ret = dm_i2c_read(dev, I2C_IO_DATA_OUT_REG_0, buf, 1);
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if (ret) {
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printf("Failed to read IO expander value via I2C\n");
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return -EIO;
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}
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/* Enable VBUS power: Set output value of VBUS pin as enabled */
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buf[0] |= I2C_IO_REG_VBUS;
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ret = dm_i2c_write(dev, I2C_IO_DATA_OUT_REG_0, buf, 1);
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if (ret) {
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printf("Failed to set IO expander via I2C\n");
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return -EIO;
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}
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mdelay(500); /* required delay to let output value settle */
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usb_enabled = 1;
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}
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return 0;
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}
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int board_early_init_f(void)
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{
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/* Nothing to do (yet), perhaps later some pin-muxing etc */
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return 0;
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}
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int board_init(void)
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{
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/* adress of boot parameters */
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gd->bd->bi_boot_params = CONFIG_SYS_SDRAM_BASE + 0x100;
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return 0;
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}
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int board_late_init(void)
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{
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/* Pre-configure the USB ports (overcurrent, VBus) */
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board_xhci_config();
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return 0;
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}
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