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/* Copyright 2016 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 "queue.h"
#include "queue_policies.h"
#include "uartn.h"
#include "usart.h"
#include "usb-stream.h"
#ifdef CONFIG_STREAM_SIGNATURE
#include "signing.h"
#endif
#define USE_UART_INTERRUPTS (!(defined(CONFIG_CUSTOMIZED_RO) && \
defined(SECTION_IS_RO)))
#define QUEUE_SIZE 64
#ifdef CONFIG_STREAM_USART1
struct usb_stream_config const ap_usb;
struct usart_config const ap_uart;
#ifdef CONFIG_STREAM_SIGNATURE
/*
* This code adds the ability to capture UART data received, and
* sign it with H1's key. This allows the log output to be verified
* as actual UART output from this board.
*
* This functionality is enabled by redirecting the UART receive queue
* to feed into the signing module rather than the usb tx. After being
* added to the running hash, the data is then pushed by the signer
* into the usb tx queue.
*/
struct signer_config const sig;
static struct queue const ap_uart_output =
QUEUE_DIRECT(QUEUE_SIZE, uint8_t, ap_uart.producer, sig.consumer);
static struct queue const sig_to_usb =
QUEUE_DIRECT(QUEUE_SIZE, uint8_t, sig.producer, ap_usb.consumer);
SIGNER_CONFIG(sig, stream_uart, sig_to_usb, ap_uart_output);
#else /* Not CONFIG_STREAM_SIGNATURE */
static struct queue const ap_uart_output =
QUEUE_DIRECT(QUEUE_SIZE, uint8_t, ap_uart.producer, ap_usb.consumer);
#endif
static struct queue const ap_usb_to_uart =
QUEUE_DIRECT(QUEUE_SIZE, uint8_t, ap_usb.producer, ap_uart.consumer);
/*
* AP UART data is sent to the ap_uart_output queue, and received from
* the ap_usb_to_uart queue. The ap_uart_output queue is received by the
* USB bridge, or if a signer is enabled, received by the signer, which then
* passes the data to the USB bridge after processing it.
*/
USART_CONFIG(ap_uart,
UART_AP,
ap_uart_output,
ap_usb_to_uart);
/*
* The UART USB bridge receives character data from the UART's queue,
* unless signing is enabled, in which case it receives data from the
* signer's queue, after the signer has received it from the UART and
* processed it.
*/
USB_STREAM_CONFIG(ap_usb,
USB_IFACE_AP,
USB_STR_AP_NAME,
USB_EP_AP,
USB_MAX_PACKET_SIZE,
USB_MAX_PACKET_SIZE,
ap_usb_to_uart,
#ifdef CONFIG_STREAM_SIGNATURE
sig_to_usb)
#else
ap_uart_output)
#endif
#endif /* CONFIG_STREAM_USART1 */
#ifdef CONFIG_STREAM_USART2
struct usb_stream_config const ec_usb;
struct usart_config const ec_uart;
static struct queue const ec_uart_to_usb =
QUEUE_DIRECT(QUEUE_SIZE, uint8_t, ec_uart.producer, ec_usb.consumer);
static struct queue const ec_usb_to_uart =
QUEUE_DIRECT(QUEUE_SIZE, uint8_t, ec_usb.producer, ec_uart.consumer);
USART_CONFIG(ec_uart,
UART_EC,
ec_uart_to_usb,
ec_usb_to_uart);
USB_STREAM_CONFIG(ec_usb,
USB_IFACE_EC,
USB_STR_EC_NAME,
USB_EP_EC,
USB_MAX_PACKET_SIZE,
USB_MAX_PACKET_SIZE,
ec_usb_to_uart,
ec_uart_to_usb)
#endif
void get_data_from_usb(struct usart_config const *config)
{
struct queue const *uart_out = config->consumer.queue;
int c;
/* Copy output from buffer until TX fifo full or output buffer empty */
while (queue_count(uart_out) && QUEUE_REMOVE_UNITS(uart_out, &c, 1))
uartn_write_char(config->uart, c);
/* If output buffer is empty, disable transmit interrupt */
if (!queue_count(uart_out))
uartn_tx_stop(config->uart);
}
void send_data_to_usb(struct usart_config const *config)
{
struct queue const *uart_in = config->producer.queue;
/* Copy input from buffer until RX fifo empty or the queue is full */
while (uartn_rx_available(config->uart) && queue_space(uart_in)) {
int c = uartn_read_char(config->uart);
QUEUE_ADD_UNITS(uart_in, &c, 1);
}
}
static void uart_read(struct producer const *producer, size_t count)
{
}
static void uart_written(struct consumer const *consumer, size_t count)
{
struct usart_config const *config =
DOWNCAST(consumer, struct usart_config, consumer);
if (uartn_tx_ready(config->uart), queue_count(consumer->queue))
uartn_tx_start(config->uart);
}
static void uart_flush(struct consumer const *consumer)
{
struct usart_config const *config =
DOWNCAST(consumer, struct usart_config, consumer);
uartn_tx_flush(config->uart);
}
struct producer_ops const uart_producer_ops = {
.read = uart_read,
};
struct consumer_ops const uart_consumer_ops = {
.written = uart_written,
.flush = uart_flush,
};
#if USE_UART_INTERRUPTS
#ifdef CONFIG_STREAM_USART1
/*
* Interrupt handlers for UART1
*/
CONFIGURE_INTERRUPTS(ap_uart,
GC_IRQNUM_UART1_RXINT,
GC_IRQNUM_UART1_TXINT)
#endif
#ifdef CONFIG_STREAM_USART2
/*
* Interrupt handlers for UART2
*/
CONFIGURE_INTERRUPTS(ec_uart,
GC_IRQNUM_UART2_RXINT,
GC_IRQNUM_UART2_TXINT)
#endif
#endif
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