309 lines
7 KiB
C
309 lines
7 KiB
C
/*
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* drivers/usb/otg/nop-usb-xceiv.c
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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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/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/of_gpio.h>
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#include <linux/gpio.h>
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#include <linux/delay.h>
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#include "phy-generic.h"
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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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return 0;
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}
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static void nop_reset_set(struct usb_phy_generic *nop, int asserted)
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{
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int value;
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if (!gpio_is_valid(nop->gpio_reset))
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return;
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value = asserted;
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if (nop->reset_active_low)
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value = !value;
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gpio_set_value_cansleep(nop->gpio_reset, value);
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if (!asserted)
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usleep_range(10000, 20000);
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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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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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clk_prepare_enable(nop->clk);
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/* De-assert RESET */
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nop_reset_set(nop, 0);
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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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/* Assert RESET */
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nop_reset_set(nop, 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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otg->phy->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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struct usb_phy_generic_platform_data *pdata)
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{
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enum usb_phy_type type = USB_PHY_TYPE_USB2;
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int err;
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u32 clk_rate = 0;
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bool needs_vcc = false;
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nop->reset_active_low = true; /* default behaviour */
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if (dev->of_node) {
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struct device_node *node = dev->of_node;
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enum of_gpio_flags flags = 0;
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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_vcc = of_property_read_bool(node, "vcc-supply");
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nop->gpio_reset = of_get_named_gpio_flags(node, "reset-gpios",
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0, &flags);
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if (nop->gpio_reset == -EPROBE_DEFER)
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return -EPROBE_DEFER;
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nop->reset_active_low = flags & OF_GPIO_ACTIVE_LOW;
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} else if (pdata) {
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type = pdata->type;
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clk_rate = pdata->clk_rate;
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needs_vcc = pdata->needs_vcc;
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nop->gpio_reset = pdata->gpio_reset;
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} else {
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nop->gpio_reset = -1;
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}
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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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}
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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(dev, "vcc");
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if (IS_ERR(nop->vcc)) {
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dev_dbg(dev, "Error getting vcc regulator: %ld\n",
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PTR_ERR(nop->vcc));
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if (needs_vcc)
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return -EPROBE_DEFER;
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}
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if (gpio_is_valid(nop->gpio_reset)) {
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unsigned long gpio_flags;
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/* Assert RESET */
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if (nop->reset_active_low)
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gpio_flags = GPIOF_OUT_INIT_LOW;
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else
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gpio_flags = GPIOF_OUT_INIT_HIGH;
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err = devm_gpio_request_one(dev, nop->gpio_reset,
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gpio_flags, dev_name(dev));
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if (err) {
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dev_err(dev, "Error requesting RESET GPIO %d\n",
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nop->gpio_reset);
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return err;
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}
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}
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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.state = OTG_STATE_UNDEFINED;
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nop->phy.type = type;
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nop->phy.otg->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 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, dev_get_platdata(&pdev->dev));
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if (err)
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return err;
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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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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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.owner = THIS_MODULE,
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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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