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