385 lines
8.6 KiB
C
385 lines
8.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* NOP USB transceiver for all USB transceiver which are either built-in
|
|
* into USB IP or which are mostly autonomous.
|
|
*
|
|
* Copyright (C) 2009 Texas Instruments Inc
|
|
* Author: Ajay Kumar Gupta <ajay.gupta@ti.com>
|
|
*
|
|
* Current status:
|
|
* This provides a "nop" transceiver for PHYs which are
|
|
* autonomous such as isp1504, isp1707, etc.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/usb/gadget.h>
|
|
#include <linux/usb/otg.h>
|
|
#include <linux/usb/usb_phy_generic.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/regulator/consumer.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_gpio.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/delay.h>
|
|
|
|
#include "phy-generic.h"
|
|
|
|
#define VBUS_IRQ_FLAGS \
|
|
(IRQF_SHARED | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | \
|
|
IRQF_ONESHOT)
|
|
|
|
struct platform_device *usb_phy_generic_register(void)
|
|
{
|
|
return platform_device_register_simple("usb_phy_generic",
|
|
PLATFORM_DEVID_AUTO, NULL, 0);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_phy_generic_register);
|
|
|
|
void usb_phy_generic_unregister(struct platform_device *pdev)
|
|
{
|
|
platform_device_unregister(pdev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_phy_generic_unregister);
|
|
|
|
static int nop_set_suspend(struct usb_phy *x, int suspend)
|
|
{
|
|
struct usb_phy_generic *nop = dev_get_drvdata(x->dev);
|
|
|
|
if (!IS_ERR(nop->clk)) {
|
|
if (suspend)
|
|
clk_disable_unprepare(nop->clk);
|
|
else
|
|
clk_prepare_enable(nop->clk);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void nop_reset(struct usb_phy_generic *nop)
|
|
{
|
|
if (!nop->gpiod_reset)
|
|
return;
|
|
|
|
gpiod_set_value_cansleep(nop->gpiod_reset, 1);
|
|
usleep_range(10000, 20000);
|
|
gpiod_set_value_cansleep(nop->gpiod_reset, 0);
|
|
}
|
|
|
|
/* interface to regulator framework */
|
|
static void nop_set_vbus_draw(struct usb_phy_generic *nop, unsigned mA)
|
|
{
|
|
struct regulator *vbus_draw = nop->vbus_draw;
|
|
int enabled;
|
|
int ret;
|
|
|
|
if (!vbus_draw)
|
|
return;
|
|
|
|
enabled = nop->vbus_draw_enabled;
|
|
if (mA) {
|
|
regulator_set_current_limit(vbus_draw, 0, 1000 * mA);
|
|
if (!enabled) {
|
|
ret = regulator_enable(vbus_draw);
|
|
if (ret < 0)
|
|
return;
|
|
nop->vbus_draw_enabled = 1;
|
|
}
|
|
} else {
|
|
if (enabled) {
|
|
ret = regulator_disable(vbus_draw);
|
|
if (ret < 0)
|
|
return;
|
|
nop->vbus_draw_enabled = 0;
|
|
}
|
|
}
|
|
nop->mA = mA;
|
|
}
|
|
|
|
|
|
static irqreturn_t nop_gpio_vbus_thread(int irq, void *data)
|
|
{
|
|
struct usb_phy_generic *nop = data;
|
|
struct usb_otg *otg = nop->phy.otg;
|
|
int vbus, status;
|
|
|
|
vbus = gpiod_get_value(nop->gpiod_vbus);
|
|
if ((vbus ^ nop->vbus) == 0)
|
|
return IRQ_HANDLED;
|
|
nop->vbus = vbus;
|
|
|
|
if (vbus) {
|
|
status = USB_EVENT_VBUS;
|
|
otg->state = OTG_STATE_B_PERIPHERAL;
|
|
nop->phy.last_event = status;
|
|
|
|
/* drawing a "unit load" is *always* OK, except for OTG */
|
|
nop_set_vbus_draw(nop, 100);
|
|
|
|
atomic_notifier_call_chain(&nop->phy.notifier, status,
|
|
otg->gadget);
|
|
} else {
|
|
nop_set_vbus_draw(nop, 0);
|
|
|
|
status = USB_EVENT_NONE;
|
|
otg->state = OTG_STATE_B_IDLE;
|
|
nop->phy.last_event = status;
|
|
|
|
atomic_notifier_call_chain(&nop->phy.notifier, status,
|
|
otg->gadget);
|
|
}
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
int usb_gen_phy_init(struct usb_phy *phy)
|
|
{
|
|
struct usb_phy_generic *nop = dev_get_drvdata(phy->dev);
|
|
int ret;
|
|
|
|
if (!IS_ERR(nop->vcc)) {
|
|
if (regulator_enable(nop->vcc))
|
|
dev_err(phy->dev, "Failed to enable power\n");
|
|
}
|
|
|
|
if (!IS_ERR(nop->clk)) {
|
|
ret = clk_prepare_enable(nop->clk);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
nop_reset(nop);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_gen_phy_init);
|
|
|
|
void usb_gen_phy_shutdown(struct usb_phy *phy)
|
|
{
|
|
struct usb_phy_generic *nop = dev_get_drvdata(phy->dev);
|
|
|
|
gpiod_set_value_cansleep(nop->gpiod_reset, 1);
|
|
|
|
if (!IS_ERR(nop->clk))
|
|
clk_disable_unprepare(nop->clk);
|
|
|
|
if (!IS_ERR(nop->vcc)) {
|
|
if (regulator_disable(nop->vcc))
|
|
dev_err(phy->dev, "Failed to disable power\n");
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_gen_phy_shutdown);
|
|
|
|
static int nop_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget)
|
|
{
|
|
if (!otg)
|
|
return -ENODEV;
|
|
|
|
if (!gadget) {
|
|
otg->gadget = NULL;
|
|
return -ENODEV;
|
|
}
|
|
|
|
otg->gadget = gadget;
|
|
if (otg->state == OTG_STATE_B_PERIPHERAL)
|
|
atomic_notifier_call_chain(&otg->usb_phy->notifier,
|
|
USB_EVENT_VBUS, otg->gadget);
|
|
else
|
|
otg->state = OTG_STATE_B_IDLE;
|
|
return 0;
|
|
}
|
|
|
|
static int nop_set_host(struct usb_otg *otg, struct usb_bus *host)
|
|
{
|
|
if (!otg)
|
|
return -ENODEV;
|
|
|
|
if (!host) {
|
|
otg->host = NULL;
|
|
return -ENODEV;
|
|
}
|
|
|
|
otg->host = host;
|
|
return 0;
|
|
}
|
|
|
|
int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_generic *nop,
|
|
struct usb_phy_generic_platform_data *pdata)
|
|
{
|
|
enum usb_phy_type type = USB_PHY_TYPE_USB2;
|
|
int err = 0;
|
|
|
|
u32 clk_rate = 0;
|
|
bool needs_vcc = false, needs_clk = false;
|
|
|
|
if (dev->of_node) {
|
|
struct device_node *node = dev->of_node;
|
|
|
|
if (of_property_read_u32(node, "clock-frequency", &clk_rate))
|
|
clk_rate = 0;
|
|
|
|
needs_vcc = of_property_read_bool(node, "vcc-supply");
|
|
needs_clk = of_property_read_bool(node, "clocks");
|
|
nop->gpiod_reset = devm_gpiod_get_optional(dev, "reset",
|
|
GPIOD_ASIS);
|
|
err = PTR_ERR_OR_ZERO(nop->gpiod_reset);
|
|
if (!err) {
|
|
nop->gpiod_vbus = devm_gpiod_get_optional(dev,
|
|
"vbus-detect",
|
|
GPIOD_ASIS);
|
|
err = PTR_ERR_OR_ZERO(nop->gpiod_vbus);
|
|
}
|
|
} else if (pdata) {
|
|
type = pdata->type;
|
|
clk_rate = pdata->clk_rate;
|
|
needs_vcc = pdata->needs_vcc;
|
|
if (gpio_is_valid(pdata->gpio_reset)) {
|
|
err = devm_gpio_request_one(dev, pdata->gpio_reset,
|
|
GPIOF_ACTIVE_LOW,
|
|
dev_name(dev));
|
|
if (!err)
|
|
nop->gpiod_reset =
|
|
gpio_to_desc(pdata->gpio_reset);
|
|
}
|
|
nop->gpiod_vbus = pdata->gpiod_vbus;
|
|
}
|
|
|
|
if (err == -EPROBE_DEFER)
|
|
return -EPROBE_DEFER;
|
|
if (err) {
|
|
dev_err(dev, "Error requesting RESET or VBUS GPIO\n");
|
|
return err;
|
|
}
|
|
if (nop->gpiod_reset)
|
|
gpiod_direction_output(nop->gpiod_reset, 1);
|
|
|
|
nop->phy.otg = devm_kzalloc(dev, sizeof(*nop->phy.otg),
|
|
GFP_KERNEL);
|
|
if (!nop->phy.otg)
|
|
return -ENOMEM;
|
|
|
|
nop->clk = devm_clk_get(dev, "main_clk");
|
|
if (IS_ERR(nop->clk)) {
|
|
dev_dbg(dev, "Can't get phy clock: %ld\n",
|
|
PTR_ERR(nop->clk));
|
|
if (needs_clk)
|
|
return PTR_ERR(nop->clk);
|
|
}
|
|
|
|
if (!IS_ERR(nop->clk) && clk_rate) {
|
|
err = clk_set_rate(nop->clk, clk_rate);
|
|
if (err) {
|
|
dev_err(dev, "Error setting clock rate\n");
|
|
return err;
|
|
}
|
|
}
|
|
|
|
nop->vcc = devm_regulator_get(dev, "vcc");
|
|
if (IS_ERR(nop->vcc)) {
|
|
dev_dbg(dev, "Error getting vcc regulator: %ld\n",
|
|
PTR_ERR(nop->vcc));
|
|
if (needs_vcc)
|
|
return -EPROBE_DEFER;
|
|
}
|
|
|
|
nop->dev = dev;
|
|
nop->phy.dev = nop->dev;
|
|
nop->phy.label = "nop-xceiv";
|
|
nop->phy.set_suspend = nop_set_suspend;
|
|
nop->phy.type = type;
|
|
|
|
nop->phy.otg->state = OTG_STATE_UNDEFINED;
|
|
nop->phy.otg->usb_phy = &nop->phy;
|
|
nop->phy.otg->set_host = nop_set_host;
|
|
nop->phy.otg->set_peripheral = nop_set_peripheral;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_phy_gen_create_phy);
|
|
|
|
static int usb_phy_generic_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct usb_phy_generic *nop;
|
|
int err;
|
|
|
|
nop = devm_kzalloc(dev, sizeof(*nop), GFP_KERNEL);
|
|
if (!nop)
|
|
return -ENOMEM;
|
|
|
|
err = usb_phy_gen_create_phy(dev, nop, dev_get_platdata(&pdev->dev));
|
|
if (err)
|
|
return err;
|
|
if (nop->gpiod_vbus) {
|
|
err = devm_request_threaded_irq(&pdev->dev,
|
|
gpiod_to_irq(nop->gpiod_vbus),
|
|
NULL, nop_gpio_vbus_thread,
|
|
VBUS_IRQ_FLAGS, "vbus_detect",
|
|
nop);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "can't request irq %i, err: %d\n",
|
|
gpiod_to_irq(nop->gpiod_vbus), err);
|
|
return err;
|
|
}
|
|
nop->phy.otg->state = gpiod_get_value(nop->gpiod_vbus) ?
|
|
OTG_STATE_B_PERIPHERAL : OTG_STATE_B_IDLE;
|
|
}
|
|
|
|
nop->phy.init = usb_gen_phy_init;
|
|
nop->phy.shutdown = usb_gen_phy_shutdown;
|
|
|
|
err = usb_add_phy_dev(&nop->phy);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "can't register transceiver, err: %d\n",
|
|
err);
|
|
return err;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, nop);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int usb_phy_generic_remove(struct platform_device *pdev)
|
|
{
|
|
struct usb_phy_generic *nop = platform_get_drvdata(pdev);
|
|
|
|
usb_remove_phy(&nop->phy);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id nop_xceiv_dt_ids[] = {
|
|
{ .compatible = "usb-nop-xceiv" },
|
|
{ }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, nop_xceiv_dt_ids);
|
|
|
|
static struct platform_driver usb_phy_generic_driver = {
|
|
.probe = usb_phy_generic_probe,
|
|
.remove = usb_phy_generic_remove,
|
|
.driver = {
|
|
.name = "usb_phy_generic",
|
|
.of_match_table = nop_xceiv_dt_ids,
|
|
},
|
|
};
|
|
|
|
static int __init usb_phy_generic_init(void)
|
|
{
|
|
return platform_driver_register(&usb_phy_generic_driver);
|
|
}
|
|
subsys_initcall(usb_phy_generic_init);
|
|
|
|
static void __exit usb_phy_generic_exit(void)
|
|
{
|
|
platform_driver_unregister(&usb_phy_generic_driver);
|
|
}
|
|
module_exit(usb_phy_generic_exit);
|
|
|
|
MODULE_ALIAS("platform:usb_phy_generic");
|
|
MODULE_AUTHOR("Texas Instruments Inc");
|
|
MODULE_DESCRIPTION("NOP USB Transceiver driver");
|
|
MODULE_LICENSE("GPL");
|