450 lines
10 KiB
C
450 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Driver for SMSC USB3503 USB 2.0 hub controller driver
|
|
*
|
|
* Copyright (c) 2012-2013 Dongjin Kim (tobetter@gmail.com)
|
|
*/
|
|
|
|
#include <linux/clk.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_gpio.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/platform_data/usb3503.h>
|
|
#include <linux/regmap.h>
|
|
|
|
#define USB3503_VIDL 0x00
|
|
#define USB3503_VIDM 0x01
|
|
#define USB3503_PIDL 0x02
|
|
#define USB3503_PIDM 0x03
|
|
#define USB3503_DIDL 0x04
|
|
#define USB3503_DIDM 0x05
|
|
|
|
#define USB3503_CFG1 0x06
|
|
#define USB3503_SELF_BUS_PWR (1 << 7)
|
|
|
|
#define USB3503_CFG2 0x07
|
|
#define USB3503_CFG3 0x08
|
|
#define USB3503_NRD 0x09
|
|
|
|
#define USB3503_PDS 0x0a
|
|
|
|
#define USB3503_SP_ILOCK 0xe7
|
|
#define USB3503_SPILOCK_CONNECT (1 << 1)
|
|
#define USB3503_SPILOCK_CONFIG (1 << 0)
|
|
|
|
#define USB3503_CFGP 0xee
|
|
#define USB3503_CLKSUSP (1 << 7)
|
|
|
|
#define USB3503_RESET 0xff
|
|
|
|
struct usb3503 {
|
|
enum usb3503_mode mode;
|
|
struct regmap *regmap;
|
|
struct device *dev;
|
|
struct clk *clk;
|
|
u8 port_off_mask;
|
|
int gpio_intn;
|
|
int gpio_reset;
|
|
int gpio_connect;
|
|
bool secondary_ref_clk;
|
|
};
|
|
|
|
static int usb3503_reset(struct usb3503 *hub, int state)
|
|
{
|
|
if (!state && gpio_is_valid(hub->gpio_connect))
|
|
gpio_set_value_cansleep(hub->gpio_connect, 0);
|
|
|
|
if (gpio_is_valid(hub->gpio_reset))
|
|
gpio_set_value_cansleep(hub->gpio_reset, state);
|
|
|
|
/* Wait T_HUBINIT == 4ms for hub logic to stabilize */
|
|
if (state)
|
|
usleep_range(4000, 10000);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int usb3503_connect(struct usb3503 *hub)
|
|
{
|
|
struct device *dev = hub->dev;
|
|
int err;
|
|
|
|
usb3503_reset(hub, 1);
|
|
|
|
if (hub->regmap) {
|
|
/* SP_ILOCK: set connect_n, config_n for config */
|
|
err = regmap_write(hub->regmap, USB3503_SP_ILOCK,
|
|
(USB3503_SPILOCK_CONNECT
|
|
| USB3503_SPILOCK_CONFIG));
|
|
if (err < 0) {
|
|
dev_err(dev, "SP_ILOCK failed (%d)\n", err);
|
|
return err;
|
|
}
|
|
|
|
/* PDS : Set the ports which are disabled in self-powered mode. */
|
|
if (hub->port_off_mask) {
|
|
err = regmap_update_bits(hub->regmap, USB3503_PDS,
|
|
hub->port_off_mask,
|
|
hub->port_off_mask);
|
|
if (err < 0) {
|
|
dev_err(dev, "PDS failed (%d)\n", err);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
/* CFG1 : Set SELF_BUS_PWR, this enables self-powered operation. */
|
|
err = regmap_update_bits(hub->regmap, USB3503_CFG1,
|
|
USB3503_SELF_BUS_PWR,
|
|
USB3503_SELF_BUS_PWR);
|
|
if (err < 0) {
|
|
dev_err(dev, "CFG1 failed (%d)\n", err);
|
|
return err;
|
|
}
|
|
|
|
/* SP_LOCK: clear connect_n, config_n for hub connect */
|
|
err = regmap_update_bits(hub->regmap, USB3503_SP_ILOCK,
|
|
(USB3503_SPILOCK_CONNECT
|
|
| USB3503_SPILOCK_CONFIG), 0);
|
|
if (err < 0) {
|
|
dev_err(dev, "SP_ILOCK failed (%d)\n", err);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
if (gpio_is_valid(hub->gpio_connect))
|
|
gpio_set_value_cansleep(hub->gpio_connect, 1);
|
|
|
|
hub->mode = USB3503_MODE_HUB;
|
|
dev_info(dev, "switched to HUB mode\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int usb3503_switch_mode(struct usb3503 *hub, enum usb3503_mode mode)
|
|
{
|
|
struct device *dev = hub->dev;
|
|
int err = 0;
|
|
|
|
switch (mode) {
|
|
case USB3503_MODE_HUB:
|
|
err = usb3503_connect(hub);
|
|
break;
|
|
|
|
case USB3503_MODE_STANDBY:
|
|
usb3503_reset(hub, 0);
|
|
dev_info(dev, "switched to STANDBY mode\n");
|
|
break;
|
|
|
|
default:
|
|
dev_err(dev, "unknown mode is requested\n");
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static const struct regmap_config usb3503_regmap_config = {
|
|
.reg_bits = 8,
|
|
.val_bits = 8,
|
|
|
|
.max_register = USB3503_RESET,
|
|
};
|
|
|
|
static int usb3503_probe(struct usb3503 *hub)
|
|
{
|
|
struct device *dev = hub->dev;
|
|
struct usb3503_platform_data *pdata = dev_get_platdata(dev);
|
|
struct device_node *np = dev->of_node;
|
|
int err;
|
|
u32 mode = USB3503_MODE_HUB;
|
|
const u32 *property;
|
|
int len;
|
|
|
|
if (pdata) {
|
|
hub->port_off_mask = pdata->port_off_mask;
|
|
hub->gpio_intn = pdata->gpio_intn;
|
|
hub->gpio_connect = pdata->gpio_connect;
|
|
hub->gpio_reset = pdata->gpio_reset;
|
|
hub->mode = pdata->initial_mode;
|
|
} else if (np) {
|
|
struct clk *clk;
|
|
u32 rate = 0;
|
|
hub->port_off_mask = 0;
|
|
|
|
if (!of_property_read_u32(np, "refclk-frequency", &rate)) {
|
|
switch (rate) {
|
|
case 38400000:
|
|
case 26000000:
|
|
case 19200000:
|
|
case 12000000:
|
|
hub->secondary_ref_clk = 0;
|
|
break;
|
|
case 24000000:
|
|
case 27000000:
|
|
case 25000000:
|
|
case 50000000:
|
|
hub->secondary_ref_clk = 1;
|
|
break;
|
|
default:
|
|
dev_err(dev,
|
|
"unsupported reference clock rate (%d)\n",
|
|
(int) rate);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
clk = devm_clk_get(dev, "refclk");
|
|
if (IS_ERR(clk) && PTR_ERR(clk) != -ENOENT) {
|
|
dev_err(dev, "unable to request refclk (%ld)\n",
|
|
PTR_ERR(clk));
|
|
return PTR_ERR(clk);
|
|
}
|
|
|
|
if (!IS_ERR(clk)) {
|
|
hub->clk = clk;
|
|
|
|
if (rate != 0) {
|
|
err = clk_set_rate(hub->clk, rate);
|
|
if (err) {
|
|
dev_err(dev,
|
|
"unable to set reference clock rate to %d\n",
|
|
(int) rate);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
err = clk_prepare_enable(hub->clk);
|
|
if (err) {
|
|
dev_err(dev,
|
|
"unable to enable reference clock\n");
|
|
return err;
|
|
}
|
|
}
|
|
|
|
property = of_get_property(np, "disabled-ports", &len);
|
|
if (property && (len / sizeof(u32)) > 0) {
|
|
int i;
|
|
for (i = 0; i < len / sizeof(u32); i++) {
|
|
u32 port = be32_to_cpu(property[i]);
|
|
if ((1 <= port) && (port <= 3))
|
|
hub->port_off_mask |= (1 << port);
|
|
}
|
|
}
|
|
|
|
hub->gpio_intn = of_get_named_gpio(np, "intn-gpios", 0);
|
|
if (hub->gpio_intn == -EPROBE_DEFER)
|
|
return -EPROBE_DEFER;
|
|
hub->gpio_connect = of_get_named_gpio(np, "connect-gpios", 0);
|
|
if (hub->gpio_connect == -EPROBE_DEFER)
|
|
return -EPROBE_DEFER;
|
|
hub->gpio_reset = of_get_named_gpio(np, "reset-gpios", 0);
|
|
if (hub->gpio_reset == -EPROBE_DEFER)
|
|
return -EPROBE_DEFER;
|
|
of_property_read_u32(np, "initial-mode", &mode);
|
|
hub->mode = mode;
|
|
}
|
|
|
|
if (hub->port_off_mask && !hub->regmap)
|
|
dev_err(dev, "Ports disabled with no control interface\n");
|
|
|
|
if (gpio_is_valid(hub->gpio_intn)) {
|
|
int val = hub->secondary_ref_clk ? GPIOF_OUT_INIT_LOW :
|
|
GPIOF_OUT_INIT_HIGH;
|
|
err = devm_gpio_request_one(dev, hub->gpio_intn, val,
|
|
"usb3503 intn");
|
|
if (err) {
|
|
dev_err(dev,
|
|
"unable to request GPIO %d as interrupt pin (%d)\n",
|
|
hub->gpio_intn, err);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
if (gpio_is_valid(hub->gpio_connect)) {
|
|
err = devm_gpio_request_one(dev, hub->gpio_connect,
|
|
GPIOF_OUT_INIT_LOW, "usb3503 connect");
|
|
if (err) {
|
|
dev_err(dev,
|
|
"unable to request GPIO %d as connect pin (%d)\n",
|
|
hub->gpio_connect, err);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
if (gpio_is_valid(hub->gpio_reset)) {
|
|
err = devm_gpio_request_one(dev, hub->gpio_reset,
|
|
GPIOF_OUT_INIT_LOW, "usb3503 reset");
|
|
/* Datasheet defines a hardware reset to be at least 100us */
|
|
usleep_range(100, 10000);
|
|
if (err) {
|
|
dev_err(dev,
|
|
"unable to request GPIO %d as reset pin (%d)\n",
|
|
hub->gpio_reset, err);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
usb3503_switch_mode(hub, hub->mode);
|
|
|
|
dev_info(dev, "%s: probed in %s mode\n", __func__,
|
|
(hub->mode == USB3503_MODE_HUB) ? "hub" : "standby");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int usb3503_i2c_probe(struct i2c_client *i2c,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct usb3503 *hub;
|
|
int err;
|
|
|
|
hub = devm_kzalloc(&i2c->dev, sizeof(struct usb3503), GFP_KERNEL);
|
|
if (!hub)
|
|
return -ENOMEM;
|
|
|
|
i2c_set_clientdata(i2c, hub);
|
|
hub->regmap = devm_regmap_init_i2c(i2c, &usb3503_regmap_config);
|
|
if (IS_ERR(hub->regmap)) {
|
|
err = PTR_ERR(hub->regmap);
|
|
dev_err(&i2c->dev, "Failed to initialise regmap: %d\n", err);
|
|
return err;
|
|
}
|
|
hub->dev = &i2c->dev;
|
|
|
|
return usb3503_probe(hub);
|
|
}
|
|
|
|
static int usb3503_i2c_remove(struct i2c_client *i2c)
|
|
{
|
|
struct usb3503 *hub;
|
|
|
|
hub = i2c_get_clientdata(i2c);
|
|
if (hub->clk)
|
|
clk_disable_unprepare(hub->clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int usb3503_platform_probe(struct platform_device *pdev)
|
|
{
|
|
struct usb3503 *hub;
|
|
|
|
hub = devm_kzalloc(&pdev->dev, sizeof(struct usb3503), GFP_KERNEL);
|
|
if (!hub)
|
|
return -ENOMEM;
|
|
hub->dev = &pdev->dev;
|
|
platform_set_drvdata(pdev, hub);
|
|
|
|
return usb3503_probe(hub);
|
|
}
|
|
|
|
static int usb3503_platform_remove(struct platform_device *pdev)
|
|
{
|
|
struct usb3503 *hub;
|
|
|
|
hub = platform_get_drvdata(pdev);
|
|
if (hub->clk)
|
|
clk_disable_unprepare(hub->clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int usb3503_i2c_suspend(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct usb3503 *hub = i2c_get_clientdata(client);
|
|
|
|
usb3503_switch_mode(hub, USB3503_MODE_STANDBY);
|
|
|
|
if (hub->clk)
|
|
clk_disable_unprepare(hub->clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int usb3503_i2c_resume(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct usb3503 *hub = i2c_get_clientdata(client);
|
|
|
|
if (hub->clk)
|
|
clk_prepare_enable(hub->clk);
|
|
|
|
usb3503_switch_mode(hub, hub->mode);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(usb3503_i2c_pm_ops, usb3503_i2c_suspend,
|
|
usb3503_i2c_resume);
|
|
|
|
static const struct i2c_device_id usb3503_id[] = {
|
|
{ USB3503_I2C_NAME, 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, usb3503_id);
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id usb3503_of_match[] = {
|
|
{ .compatible = "smsc,usb3503", },
|
|
{ .compatible = "smsc,usb3503a", },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, usb3503_of_match);
|
|
#endif
|
|
|
|
static struct i2c_driver usb3503_i2c_driver = {
|
|
.driver = {
|
|
.name = USB3503_I2C_NAME,
|
|
.pm = &usb3503_i2c_pm_ops,
|
|
.of_match_table = of_match_ptr(usb3503_of_match),
|
|
},
|
|
.probe = usb3503_i2c_probe,
|
|
.remove = usb3503_i2c_remove,
|
|
.id_table = usb3503_id,
|
|
};
|
|
|
|
static struct platform_driver usb3503_platform_driver = {
|
|
.driver = {
|
|
.name = USB3503_I2C_NAME,
|
|
.of_match_table = of_match_ptr(usb3503_of_match),
|
|
},
|
|
.probe = usb3503_platform_probe,
|
|
.remove = usb3503_platform_remove,
|
|
};
|
|
|
|
static int __init usb3503_init(void)
|
|
{
|
|
int err;
|
|
|
|
err = i2c_add_driver(&usb3503_i2c_driver);
|
|
if (err != 0)
|
|
pr_err("usb3503: Failed to register I2C driver: %d\n", err);
|
|
|
|
err = platform_driver_register(&usb3503_platform_driver);
|
|
if (err != 0)
|
|
pr_err("usb3503: Failed to register platform driver: %d\n",
|
|
err);
|
|
|
|
return 0;
|
|
}
|
|
module_init(usb3503_init);
|
|
|
|
static void __exit usb3503_exit(void)
|
|
{
|
|
platform_driver_unregister(&usb3503_platform_driver);
|
|
i2c_del_driver(&usb3503_i2c_driver);
|
|
}
|
|
module_exit(usb3503_exit);
|
|
|
|
MODULE_AUTHOR("Dongjin Kim <tobetter@gmail.com>");
|
|
MODULE_DESCRIPTION("USB3503 USB HUB driver");
|
|
MODULE_LICENSE("GPL");
|