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https://github.com/brain-hackers/u-boot-brain
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![Tom Rini](/assets/img/avatar_default.png)
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
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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