text: /****************************************************************************
   *
   * Copyright 2019 NXP Semiconductors All Rights Reserved.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied. See the License for the specific
   * language governing permissions and limitations under the License.
   *
   ****************************************************************************/
  /************************************************************************************
   * arch/arm/src/imxrt_usbhost.c
   *
   *   Copyright (C) 2013, 2015-2017 Gregory Nutt. All rights reserved.
   *   Author: Gregory Nutt <gnutt@nuttx.org>
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   * 3. Neither the name NuttX nor the names of its contributors may be
   *    used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
   * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   *
   ************************************************************************************/
  
  /************************************************************************************
   * Included Files
   ************************************************************************************/
  
  #include <tinyara/config.h>
  
  #include <stdio.h>
  #include <sys/types.h>
  #include <stdint.h>
  #include <stdbool.h>
  #include <sched.h>
  #include <errno.h>
  #include <assert.h>
  #include <debug.h>
  
  #include <tinyara/irq.h>
  #include <tinyara/kthread.h>
  #include <tinyara/usb/usbdev.h>
  #include <tinyara/usb/usbhost.h>
  #include <tinyara/usb/usbdev_trace.h>
  
  #include "up_arch.h"
  #include "chip.h"
  #include "imxrt_gpio.h"
  #include "chip/imxrt_pinmux.h"
  #include "imxrt_ehci.h"
  #include "imxrt_log.h"
  
  #ifdef HAVE_USBHOST
  
  /************************************************************************************
   * Pre-processor Definitions
   ************************************************************************************/
  
  #ifndef CONFIG_USBHOST_DEFPRIO
  #define CONFIG_USBHOST_DEFPRIO 50
  #endif
  
  #ifndef CONFIG_USBHOST_STACKSIZE
  #ifdef CONFIG_USBHOST_HUB
  #define CONFIG_USBHOST_STACKSIZE 1536
  #else
  #define CONFIG_USBHOST_STACKSIZE 1024
  #endif
  #endif
  
  #undef uerr
  #undef uinfo
  #if defined(DEBUG_IMX_DMA_DRIVER)
  #define uinfo(format, ...)   printf(format, ##__VA_ARGS__)
  #define uerr(format, ...)   printf(format, ##__VA_ARGS__)
  #else
  #define uinfo(format, ...)
  #endif
  #define uerr(format, ...)   printf(format, ##__VA_ARGS__)
  
  /************************************************************************************
   * Private Data
   ************************************************************************************/
  /* Retained device driver handle */
  
  static struct usbhost_connection_s *g_ehciconn;
  
  /* Overcurrent interrupt handler */
  
  #if 0							/* Not yet implemented */
  static xcpt_t g_ochandler;
  #endif
  
  /************************************************************************************
   * Private Functions
   ************************************************************************************/
  
  /************************************************************************************
   * Name: ehci_waiter
   *
   * Description:
   *   Wait for USB devices to be connected to the EHCI root hub.
   *
   ************************************************************************************/
  
  static int ehci_waiter(int argc, char *argv[])
  {
  	FAR struct usbhost_hubport_s *hport;
  
  	uinfo("ehci_waiter:  Running\n");
  	for (;;) {
  		/* Wait for the device to change state */
  
  		DEBUGVERIFY(CONN_WAIT(g_ehciconn, &hport));
  		syslog(LOG_INFO, "ehci_waiter: %s\n", hport->connected ? "connected" : "disconnected");
  
  		/* Did we just become connected? */
  
  		if (hport->connected) {
  			/* Yes.. enumerate the newly connected device */
  
  			(void)CONN_ENUMERATE(g_ehciconn, hport);
  		}
  	}
  
  	/* Keep the compiler from complaining */
  
  	return 0;
  }
  
  /************************************************************************************
   * Public Functions
   ************************************************************************************/
  
  /************************************************************************************
   * Name: imxrt_usbhost_bootinitialize
   *
   * Description:
   *   Called from imxrt_boardinitialize very early in inialization to setup USB
   *   host-related GPIO pins for the LPC-H3131 board.
   *
   *   SIGNAL      GPIO
   *   ----------- -------
   *   #OTG_PWR_E  GPIO19
   *   #OTG_OVRCR  GPIO20
   *
   ************************************************************************************/
  
  void weak_function imxrt_usbhost_bootinitialize(void)
  {
  	/* Configure output pin to drive VBUS power (initial state: power off) */
  
  	imxrt_config_gpio(GPIO_USB_OTG1_PWR_1);
  
  	/* Configure input pin to detect overrcurrent errors */
  
  	imxrt_config_gpio(GPIO_USB_OTG1_OC_1);
  
  	/* Configure to receive interrupts on the overrcurrent input pin */
  #warning Missing logic
  }
  
  /***********************************************************************************
   * Name: imxrt_usbhost_initialize
   *
   * Description:
   *   Called at application startup time to initialize the USB host functionality.
   *   This function will start a thread that will monitor for device
   *   connection/disconnection events.
   *
   ***********************************************************************************/
  
  int imxrt_usbhost_initialize(void)
  {
  	pid_t pid;
  
  	/* Then get an instance of the USB EHCI interface. */
  
  	g_ehciconn = imxrt_ehci_initialize(0);
  	if (!g_ehciconn) {
  		IMXLOG("ERROR: imxrt_ehci_initialize failed\n");
  		return -ENODEV;
  	}
  
  	/* Start a thread to handle device connection. */
  	pid = task_create("EHCI Monitor", CONFIG_USBHOST_DEFPRIO, CONFIG_USBHOST_STACKSIZE, (main_t)ehci_waiter, (FAR char *const *)NULL);
  	if (pid < 0) {
  		IMXLOG("ERROR: Failed to create ehci_waiter task\n");
  		return pid;
  	}
  
  	return OK;
  }
  
  /***********************************************************************************
   * Name: imxrt_usbhost_vbusdrive
   *
   * Description:
   *   Enable/disable driving of VBUS 5V output.  This function must be provided by
   *   each platform that implements the OHCI or EHCI host interface
   *
   * Input Parameters:
   *   rhport - Selects root hub port to be powered host interface. Since the LPC31
   *     has only a downstream port, zero is the only possible value for this
   *     parameter.
   *   enable - true: enable VBUS power; false: disable VBUS power
   *
   * Returned Value:
   *   None
   *
   ***********************************************************************************/
  
  void imxrt_usbhost_vbusdrive(int rhport, bool enable)
  {
  	uinfo("RHPort%d: enable=%d\n", rhport + 1, enable);
  
  	/* The LPC3131 has only a single root hub port */
  
  #ifdef NEED_REFERENCE 
  	if (rhport == 0) {
  		/* Then enable or disable VBUS power */
  
  		if (enable) {
  			/* Enable the Power Switch by driving the enable pin low */
  
  			imxrt_gpio_write(GPIO_USB_OTG1_PWR_1, GPIO_OUTPUT_ZERO);
  		} else {
  			/* Disable the Power Switch by driving the enable pin high */
  
  			imxrt_gpio_write(GPIO_USB_OTG1_PWR_1, GPIO_OUTPUT_ONE);
  		}
  	}
  #endif
  }
  
  #endif							/* HAVE_USBHOST */
  