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/* Copyright 2014 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "atomic.h"
#include "common.h"
#include "config.h"
#include "link_defs.h"
#include "printf.h"
#include "registers.h"
#include "task.h"
#include "timer.h"
#include "util.h"
#include "usart.h"
#include "usb_hw.h"
#include "usb-stream.h"
static size_t rx_read(struct usb_stream_config const *config)
{
uintptr_t address = btable_ep[config->endpoint].rx_addr;
size_t count = btable_ep[config->endpoint].rx_count & RX_COUNT_MASK;
/*
* Only read the received USB packet if there is enough space in the
* receive queue.
*/
if (count > queue_space(config->producer.queue))
return 0;
return queue_add_memcpy(config->producer.queue,
(void *) address,
count,
memcpy_from_usbram);
}
static size_t tx_write(struct usb_stream_config const *config)
{
uintptr_t address = btable_ep[config->endpoint].tx_addr;
size_t count = queue_remove_memcpy(config->consumer.queue,
(void *) address,
config->tx_size,
memcpy_to_usbram);
btable_ep[config->endpoint].tx_count = count;
return count;
}
static int tx_valid(struct usb_stream_config const *config)
{
return (STM32_USB_EP(config->endpoint) & EP_TX_MASK) == EP_TX_VALID;
}
static int rx_valid(struct usb_stream_config const *config)
{
return (STM32_USB_EP(config->endpoint) & EP_RX_MASK) == EP_RX_VALID;
}
static int rx_disabled(struct usb_stream_config const *config)
{
return config->state->rx_disabled;
}
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, 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, 0);
}
struct producer_ops const usb_stream_producer_ops = {
.read = usb_read,
};
struct consumer_ops const usb_stream_consumer_ops = {
.written = usb_written,
};
void usb_stream_deferred(struct usb_stream_config const *config)
{
if (!tx_valid(config) && tx_write(config))
STM32_TOGGLE_EP(config->endpoint, EP_TX_MASK, EP_TX_VALID, 0);
if (!rx_valid(config) && !rx_disabled(config) && rx_read(config))
STM32_TOGGLE_EP(config->endpoint, EP_RX_MASK, EP_RX_VALID, 0);
}
void usb_stream_tx(struct usb_stream_config const *config)
{
STM32_TOGGLE_EP(config->endpoint, 0, 0, 0);
hook_call_deferred(config->deferred, 0);
}
void usb_stream_rx(struct usb_stream_config const *config)
{
STM32_TOGGLE_EP(config->endpoint, 0, 0, 0);
hook_call_deferred(config->deferred, 0);
}
static usb_uint usb_ep_rx_size(size_t bytes)
{
if (bytes < 64)
return bytes << 9;
else
return 0x8000 | ((bytes - 32) << 5);
}
void usb_stream_event(struct usb_stream_config const *config,
enum usb_ep_event evt)
{
int i;
if (evt != USB_EVENT_RESET)
return;
i = config->endpoint;
btable_ep[i].tx_addr = usb_sram_addr(config->tx_ram);
btable_ep[i].tx_count = 0;
btable_ep[i].rx_addr = usb_sram_addr(config->rx_ram);
btable_ep[i].rx_count = usb_ep_rx_size(config->rx_size);
config->state->rx_waiting = 0;
STM32_USB_EP(i) = ((i << 0) | /* Endpoint Addr*/
(2 << 4) | /* TX NAK */
(0 << 9) | /* Bulk EP */
(rx_disabled(config) ? EP_RX_NAK : EP_RX_VALID));
}
int usb_usart_interface(struct usb_stream_config const *config,
struct usart_config const *usart,
int interface,
usb_uint *rx_buf, usb_uint *tx_buf)
{
struct usb_setup_packet req;
usb_read_setup_packet(rx_buf, &req);
if (req.bmRequestType != (USB_DIR_OUT |
USB_TYPE_VENDOR |
USB_RECIP_INTERFACE))
return -1;
if (req.wIndex != interface ||
req.wLength != 0)
return -1;
switch (req.bRequest) {
/* Set parity. */
case USB_USART_SET_PARITY:
usart_set_parity(usart, req.wValue);
break;
case USB_USART_SET_BAUD:
usart_set_baud(usart, req.wValue * 100);
break;
/* TODO(nsanders): support reading parity. */
/* TODO(nsanders): support reading baud. */
default:
return -1;
}
btable_ep[0].tx_count = 0;
STM32_TOGGLE_EP(0, EP_TX_RX_MASK, EP_TX_RX_VALID, EP_STATUS_OUT);
return 0;
}
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