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