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/* Copyright 2016 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "console.h"
#include "registers.h"
#include "timer.h"
#include "usb_dwc_stream.h"
#include "util.h"
#define CPRINTF(format, args...) cprintf(CC_USB, format, ##args)
/*
* This function tries to shove new bytes from the USB host into the queue for
* consumption elsewhere. It is invoked either by a HW interrupt (telling us we
* have new bytes from the USB host), or by whoever is reading bytes out of the
* other end of the queue (telling us that there's now more room in the queue
* if we still have bytes to shove in there).
*/
int rx_stream_handler(struct usb_stream_config const *config)
{
int rx_count = rx_ep_pending(config->endpoint);
/* If we have some, try to shove them into the queue */
if (rx_count) {
size_t added = QUEUE_ADD_UNITS(config->producer.queue,
config->rx_ram, rx_count);
if (added != rx_count) {
CPRINTF("rx_stream_handler: failed ep%d "
"queue %d bytes, accepted %d\n",
config->endpoint, rx_count, added);
}
}
if (!rx_ep_is_active(config->endpoint))
usb_read_ep(config->endpoint, config->rx_size, config->rx_ram);
return rx_count;
}
/* Try to send some bytes to the host */
int tx_stream_handler(struct usb_stream_config const *config)
{
size_t count;
if (!*(config->is_reset))
return 0;
if (!tx_ep_is_ready(config->endpoint))
return 0;
count = QUEUE_REMOVE_UNITS(config->consumer.queue, config->tx_ram,
config->tx_size);
if (count)
usb_write_ep(config->endpoint, count, config->tx_ram);
return count;
}
/* Reset stream */
void usb_stream_event(struct usb_stream_config const *config,
enum usb_ep_event evt)
{
if (evt != USB_EVENT_RESET)
return;
epN_reset(config->endpoint);
*(config->is_reset) = 1;
/* Flush any queued data */
hook_call_deferred(config->deferred_tx, 0);
hook_call_deferred(config->deferred_rx, 0);
}
static void usb_read(struct producer const *producer, size_t count)
{
struct usb_stream_config const *config =
DOWNCAST(producer, struct usb_stream_config, producer);
hook_call_deferred(config->deferred_rx, 0);
}
static void usb_written(struct consumer const *consumer, size_t count)
{
struct usb_stream_config const *config =
DOWNCAST(consumer, struct usb_stream_config, consumer);
hook_call_deferred(config->deferred_tx, 0);
}
struct producer_ops const usb_stream_producer_ops = {
.read = usb_read,
};
struct consumer_ops const usb_stream_consumer_ops = {
.written = usb_written,
};
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