1 files changed, 0 insertions, 75 deletions
diff --git a/chip/stm32/usart_tx_interrupt.c b/chip/stm32/usart_tx_interrupt.c
deleted file mode 100644
index 7c7f1f84de..0000000000
--- a/chip/stm32/usart_tx_interrupt.c
+++ /dev/null
@@ -1,75 +0,0 @@
-/* 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.
- */
-
-/* Interrupt based USART TX driver for STM32 */
-
-#include "usart.h"
-
-#include "common.h"
-#include "registers.h"
-#include "system.h"
-#include "util.h"
-
-static void usart_tx_init(struct usart_config const *config)
-{
-	intptr_t base = config->hw->base;
-
-	STM32_USART_CR1(base) |= STM32_USART_CR1_TE;
-}
-
-static void usart_written(struct consumer const *consumer, size_t count)
-{
-	struct usart_config const *config =
-		DOWNCAST(consumer, struct usart_config, consumer);
-
-	/*
-	 * Enable USART interrupt.  This causes the USART interrupt handler to
-	 * start fetching from the TX queue if it wasn't already.
-	 */
-	if (count)
-		STM32_USART_CR1(config->hw->base) |= STM32_USART_CR1_TXEIE;
-}
-
-static void usart_tx_interrupt_handler(struct usart_config const *config)
-{
-	intptr_t base = config->hw->base;
-	uint8_t  byte;
-
-	if (!(STM32_USART_SR(base) & STM32_USART_SR_TXE))
-		return;
-
-	if (queue_remove_unit(config->consumer.queue, &byte)) {
-		STM32_USART_TDR(base) = byte;
-
-		/*
-		 * Make sure the TXE interrupt is enabled and that we won't go
-		 * into deep sleep.  This invocation of the USART interrupt
-		 * handler may have been manually triggered to start
-		 * transmission.
-		 */
-		disable_sleep(SLEEP_MASK_UART);
-
-		STM32_USART_CR1(base) |= STM32_USART_CR1_TXEIE;
-	} else {
-		/*
-		 * The TX queue is empty, disable the TXE interrupt and enable
-		 * deep sleep mode. The TXE interrupt will remain disabled
-		 * until a write call happens.
-		 */
-		enable_sleep(SLEEP_MASK_UART);
-
-		STM32_USART_CR1(base) &= ~STM32_USART_CR1_TXEIE;
-	}
-}
-
-struct usart_tx const usart_tx_interrupt = {
-	.consumer_ops = {
-		.written = usart_written,
-	},
-
-	.init      = usart_tx_init,
-	.interrupt = usart_tx_interrupt_handler,
-	.info      = NULL,
-};