1 files changed, 0 insertions, 102 deletions
diff --git a/chip/stm32/usart_tx_dma.c b/chip/stm32/usart_tx_dma.c
deleted file mode 100644
index 0c8e2c73d6..0000000000
--- a/chip/stm32/usart_tx_dma.c
+++ /dev/null
@@ -1,102 +0,0 @@
-/* Copyright 2015 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 "usart_tx_dma.h"
-
-#include "usart.h"
-#include "common.h"
-#include "registers.h"
-#include "system.h"
-#include "task.h"
-#include "util.h"
-
-void usart_tx_dma_written(struct consumer const *consumer, size_t count)
-{
-	struct usart_config const *config =
-		DOWNCAST(consumer, struct usart_config, consumer);
-
-	task_trigger_irq(config->hw->irq);
-}
-
-void usart_tx_dma_init(struct usart_config const *config)
-{
-	struct usart_tx_dma const *dma_config =
-		DOWNCAST(config->tx, struct usart_tx_dma const, usart_tx);
-
-	intptr_t base = config->hw->base;
-
-	STM32_USART_CR1(base) |= STM32_USART_CR1_TE;
-	STM32_USART_CR3(base) |= STM32_USART_CR3_DMAT;
-
-	dma_config->state->dma_active = 0;
-}
-
-static void usart_tx_dma_start(struct usart_config const *config,
-			       struct usart_tx_dma const *dma_config)
-{
-	struct usart_tx_dma_state volatile *state = dma_config->state;
-	intptr_t                           base   = config->hw->base;
-
-	struct dma_option options = {
-		.channel = dma_config->channel,
-		.periph  = (void *)&STM32_USART_TDR(base),
-		.flags   = (STM32_DMA_CCR_MSIZE_8_BIT |
-			    STM32_DMA_CCR_PSIZE_8_BIT),
-	};
-
-	/*
-	 * Limit our DMA transfer.  If we didn't do this then it would be
-	 * possible to start a large DMA transfer of an entirely full buffer
-	 * that would hold up any additional writes to the TX queue
-	 * unnecessarily.
-	 */
-	state->chunk.count = MIN(state->chunk.count, dma_config->max_bytes);
-
-	dma_prepare_tx(&options, state->chunk.count, state->chunk.buffer);
-
-	state->dma_active = 1;
-
-	usart_clear_tc(config);
-	STM32_USART_CR1(base) |= STM32_USART_CR1_TCIE;
-
-	dma_go(dma_get_channel(options.channel));
-}
-
-static void usart_tx_dma_stop(struct usart_config const *config,
-			      struct usart_tx_dma const *dma_config)
-{
-	dma_config->state->dma_active = 0;
-
-	STM32_USART_CR1(config->hw->base) &= ~STM32_USART_CR1_TCIE;
-}
-
-void usart_tx_dma_interrupt(struct usart_config const *config)
-{
-	struct usart_tx_dma const *dma_config =
-		DOWNCAST(config->tx, struct usart_tx_dma const, usart_tx);
-	struct usart_tx_dma_state volatile *state = dma_config->state;
-
-	/*
-	 * If we have completed a DMA transaction, or if we haven't yet started
-	 * one then we clean up and start one now.
-	 */
-	if ((STM32_USART_SR(config->hw->base) & STM32_USART_SR_TC) ||
-	    !state->dma_active) {
-		struct queue const *queue = config->consumer.queue;
-
-		/*
-		 * Only advance the queue head (indicating that we have read
-		 * units from the queue if we had an active DMA transfer.
-		 */
-		if (state->dma_active)
-			queue_advance_head(queue, state->chunk.count);
-
-		state->chunk = queue_get_read_chunk(queue);
-
-		if (state->chunk.count)
-			usart_tx_dma_start(config, dma_config);
-		else
-			usart_tx_dma_stop(config, dma_config);
-	}
-}