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// SPDX-License-Identifier: GPL-2.0-only
/*
* Driver for onboard USB hubs
*
* Copyright (C) 2022, STMicroelectronics - All Rights Reserved
*
* Mostly inspired by Linux kernel v6.1 onboard_usb_hub driver
*/
#include <asm/gpio.h>
#include <dm.h>
#include <dm/device_compat.h>
#include <i2c.h>
#include <linux/delay.h>
#include <power/regulator.h>
#define USB5744_COMMAND_ATTACH 0x0056
#define USB5744_COMMAND_ATTACH_LSB 0xAA
#define USB5744_CONFIG_REG_ACCESS 0x0037
#define USB5744_CONFIG_REG_ACCESS_LSB 0x99
struct onboard_hub {
struct udevice *vdd;
struct gpio_desc *reset_gpio;
};
struct onboard_hub_data {
unsigned long reset_us;
unsigned long power_on_delay_us;
int (*init)(struct udevice *dev);
};
static int usb5744_i2c_init(struct udevice *dev)
{
/*
* Prevent the MCU from the putting the HUB in suspend mode through register write.
* The BYPASS_UDC_SUSPEND bit (Bit 3) of the RuntimeFlags2 register at address
* 0x411D controls this aspect of the hub.
* Format to write to hub registers via SMBus- 2D 00 00 05 00 01 41 1D 08
* Byte 0: Address of slave 2D
* Byte 1: Memory address 00
* Byte 2: Memory address 00
* Byte 3: Number of bytes to write to memory
* Byte 4: Write configuration register (00)
* Byte 5: Write the number of data bytes (01- 1 data byte)
* Byte 6: LSB of register address 0x41
* Byte 7: MSB of register address 0x1D
* Byte 8: value to be written to the register
*/
u8 data_buf[8] = {0x0, 0x5, 0x0, 0x1, 0x41, 0x1D, 0x08};
u8 config_reg_access_buf = USB5744_CONFIG_REG_ACCESS;
struct udevice *i2c_bus = NULL, *i2c_dev;
struct ofnode_phandle_args phandle;
u8 buf = USB5744_COMMAND_ATTACH;
struct dm_i2c_chip *i2c_chip;
int ret, slave_addr;
ret = dev_read_phandle_with_args(dev, "i2c-bus", NULL, 0, 0, &phandle);
if (ret) {
dev_err(dev, "i2c-bus not specified\n");
return ret;
}
ret = device_get_global_by_ofnode(ofnode_get_parent(phandle.node), &i2c_bus);
if (ret) {
dev_err(dev, "Failed to get i2c node, err: %d\n", ret);
return ret;
}
ret = ofnode_read_u32(phandle.node, "reg", &slave_addr);
if (ret)
return ret;
ret = i2c_get_chip(i2c_bus, slave_addr, 1, &i2c_dev);
if (ret) {
dev_err(dev, "%s: can't find i2c chip device for addr 0x%x\n", __func__,
slave_addr);
return ret;
}
i2c_chip = dev_get_parent_plat(i2c_dev);
if (!i2c_chip) {
dev_err(dev, "parent platform data not found\n");
return -EINVAL;
}
i2c_chip->flags &= ~DM_I2C_CHIP_WR_ADDRESS;
/* SMBus write command */
ret = dm_i2c_write(i2c_dev, 0, (uint8_t *)&data_buf, 8);
if (ret) {
dev_err(dev, "data_buf i2c_write failed, err:%d\n", ret);
return ret;
}
/* Configuration register access command */
ret = dm_i2c_write(i2c_dev, USB5744_CONFIG_REG_ACCESS_LSB,
&config_reg_access_buf, 2);
if (ret) {
dev_err(dev, "config_reg_access i2c_write failed, err: %d\n", ret);
return ret;
}
/* USB Attach with SMBus */
ret = dm_i2c_write(i2c_dev, USB5744_COMMAND_ATTACH_LSB, &buf, 2);
if (ret) {
dev_err(dev, "usb_attach i2c_write failed, err: %d\n", ret);
return ret;
}
return 0;
}
int usb_onboard_hub_reset(struct udevice *dev)
{
struct onboard_hub_data *data =
(struct onboard_hub_data *)dev_get_driver_data(dev);
struct onboard_hub *hub = dev_get_priv(dev);
int ret;
hub->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_IS_OUT);
/* property is optional, don't return error! */
if (!hub->reset_gpio)
return 0;
ret = dm_gpio_set_value(hub->reset_gpio, 1);
if (ret)
return ret;
udelay(data->reset_us);
ret = dm_gpio_set_value(hub->reset_gpio, 0);
if (ret)
return ret;
udelay(data->power_on_delay_us);
return 0;
}
static int usb_onboard_hub_probe(struct udevice *dev)
{
struct onboard_hub_data *data =
(struct onboard_hub_data *)dev_get_driver_data(dev);
struct onboard_hub *hub = dev_get_priv(dev);
int ret;
ret = device_get_supply_regulator(dev, "vdd-supply", &hub->vdd);
if (ret && ret != -ENOENT && ret != -ENOSYS) {
dev_err(dev, "can't get vdd-supply: %d\n", ret);
return ret;
}
if (hub->vdd) {
ret = regulator_set_enable_if_allowed(hub->vdd, true);
if (ret && ret != -ENOSYS) {
dev_err(dev, "can't enable vdd-supply: %d\n", ret);
return ret;
}
}
ret = usb_onboard_hub_reset(dev);
if (ret)
return ret;
if (data->init) {
ret = data->init(dev);
if (ret) {
dev_err(dev, "onboard i2c init failed: %d\n", ret);
goto err;
}
}
return 0;
err:
dm_gpio_set_value(hub->reset_gpio, 0);
return ret;
}
static int usb_onboard_hub_bind(struct udevice *dev)
{
struct ofnode_phandle_args phandle;
const void *fdt = gd->fdt_blob;
int ret, off;
ret = dev_read_phandle_with_args(dev, "peer-hub", NULL, 0, 0, &phandle);
if (ret == -ENOENT) {
dev_dbg(dev, "peer-hub property not present\n");
return 0;
}
if (ret) {
dev_err(dev, "peer-hub not specified\n");
return ret;
}
off = ofnode_to_offset(phandle.node);
ret = fdt_node_check_compatible(fdt, off, "usb424,5744");
if (!ret)
return 0;
return -ENODEV;
}
static int usb_onboard_hub_remove(struct udevice *dev)
{
struct onboard_hub *hub = dev_get_priv(dev);
int ret = 0;
if (hub->reset_gpio)
dm_gpio_free(hub->reset_gpio->dev, hub->reset_gpio);
if (hub->vdd) {
ret = regulator_set_enable_if_allowed(hub->vdd, false);
if (ret)
dev_err(dev, "can't disable vdd-supply: %d\n", ret);
}
return ret;
}
static const struct onboard_hub_data usb2514_data = {
.power_on_delay_us = 500,
.reset_us = 1,
};
static const struct onboard_hub_data usb5744_data = {
.init = usb5744_i2c_init,
.power_on_delay_us = 1000,
.reset_us = 5,
};
static const struct udevice_id usb_onboard_hub_ids[] = {
/* Use generic usbVID,PID dt-bindings (usb-device.yaml) */
{ .compatible = "usb424,2514", /* USB2514B USB 2.0 */
.data = (ulong)&usb2514_data,
}, {
.compatible = "usb424,2744", /* USB2744 USB 2.0 */
.data = (ulong)&usb5744_data,
}, {
.compatible = "usb424,5744", /* USB5744 USB 3.0 */
.data = (ulong)&usb5744_data,
}
};
U_BOOT_DRIVER(usb_onboard_hub) = {
.name = "usb_onboard_hub",
.id = UCLASS_USB_HUB,
.bind = usb_onboard_hub_bind,
.probe = usb_onboard_hub_probe,
.remove = usb_onboard_hub_remove,
.of_match = usb_onboard_hub_ids,
.priv_auto = sizeof(struct onboard_hub),
};
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