linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * udc.c - ChipIdea UDC driver

 *

 * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.

 *

 * Author: David Lopo

 */

​

#include <linux/delay.h>

#include <linux/device.h>

#include <linux/dmapool.h>

#include <linux/err.h>

#include <linux/irqreturn.h>

#include <linux/kernel.h>

#include <linux/slab.h>

#include <linux/pm_runtime.h>

#include <linux/pinctrl/consumer.h>

#include <linux/usb/ch9.h>

#include <linux/usb/gadget.h>

#include <linux/usb/otg-fsm.h>

#include <linux/usb/chipidea.h>

​

#include "ci.h"

#include "udc.h"

#include "bits.h"

#include "otg.h"

#include "otg_fsm.h"

​

/* control endpoint description */

static const struct usb_endpoint_descriptor

ctrl_endpt_out_desc = {

    .bLength         = USB_DT_ENDPOINT_SIZE,

    .bDescriptorType = USB_DT_ENDPOINT,

​

    .bEndpointAddress = USB_DIR_OUT,

    .bmAttributes    = USB_ENDPOINT_XFER_CONTROL,

    .wMaxPacketSize  = cpu_to_le16(CTRL_PAYLOAD_MAX),

};

​

static const struct usb_endpoint_descriptor

ctrl_endpt_in_desc = {

    .bLength         = USB_DT_ENDPOINT_SIZE,

    .bDescriptorType = USB_DT_ENDPOINT,

​

    .bEndpointAddress = USB_DIR_IN,

    .bmAttributes    = USB_ENDPOINT_XFER_CONTROL,

    .wMaxPacketSize  = cpu_to_le16(CTRL_PAYLOAD_MAX),

};

​

/**

 * hw_ep_bit: calculates the bit number

 * @num: endpoint number

 * @dir: endpoint direction

 *

 * This function returns bit number

 */

static inline int hw_ep_bit(int num, int dir)

{

    return num + ((dir == TX) ? 16 : 0);

}

​

static inline int ep_to_bit(struct ci_hdrc *ci, int n)

{

    int fill = 16 - ci->hw_ep_max / 2;

​

    if (n >= ci->hw_ep_max / 2)

        n += fill;

​

    return n;

}

​

/**

 * hw_device_state: enables/disables interrupts (execute without interruption)

 * @dma: 0 => disable, !0 => enable and set dma engine

 *

 * This function returns an error code

 */

static int hw_device_state(struct ci_hdrc *ci, u32 dma)

{

    if (dma) {

        hw_write(ci, OP_ENDPTLISTADDR, ~0, dma);

        /* interrupt, error, port change, reset, sleep/suspend */

        hw_write(ci, OP_USBINTR, ~0,

                 USBi_UI|USBi_UEI|USBi_PCI|USBi_URI|USBi_SLI);

    } else {

        hw_write(ci, OP_USBINTR, ~0, 0);

    }

    return 0;

}

​

/**