stm32-usart.c (2a3bcfe03725472607110507b6860d823e0deb41) stm32-usart.c (195437d14fb424a2ee50d51441181f16fd549789)
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) Maxime Coquelin 2015
4 * Copyright (C) STMicroelectronics SA 2017
5 * Authors: Maxime Coquelin <mcoquelin.stm32@gmail.com>
6 * Gerald Baeza <gerald.baeza@foss.st.com>
7 * Erwan Le Ray <erwan.leray@foss.st.com>
8 *

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472}
473
474static void stm32_usart_transmit_chars_dma(struct uart_port *port)
475{
476 struct stm32_port *stm32port = to_stm32_port(port);
477 const struct stm32_usart_offsets *ofs = &stm32port->info->ofs;
478 struct circ_buf *xmit = &port->state->xmit;
479 struct dma_async_tx_descriptor *desc = NULL;
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) Maxime Coquelin 2015
4 * Copyright (C) STMicroelectronics SA 2017
5 * Authors: Maxime Coquelin <mcoquelin.stm32@gmail.com>
6 * Gerald Baeza <gerald.baeza@foss.st.com>
7 * Erwan Le Ray <erwan.leray@foss.st.com>
8 *

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472}
473
474static void stm32_usart_transmit_chars_dma(struct uart_port *port)
475{
476 struct stm32_port *stm32port = to_stm32_port(port);
477 const struct stm32_usart_offsets *ofs = &stm32port->info->ofs;
478 struct circ_buf *xmit = &port->state->xmit;
479 struct dma_async_tx_descriptor *desc = NULL;
480 unsigned int count, i;
480 unsigned int count;
481
482 if (stm32_usart_tx_dma_started(stm32port)) {
483 if (!stm32_usart_tx_dma_enabled(stm32port))
484 stm32_usart_set_bits(port, ofs->cr3, USART_CR3_DMAT);
485 return;
486 }
487
488 count = uart_circ_chars_pending(xmit);

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537
538 stm32_usart_set_bits(port, ofs->cr3, USART_CR3_DMAT);
539
540 xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
541 port->icount.tx += count;
542 return;
543
544fallback_err:
481
482 if (stm32_usart_tx_dma_started(stm32port)) {
483 if (!stm32_usart_tx_dma_enabled(stm32port))
484 stm32_usart_set_bits(port, ofs->cr3, USART_CR3_DMAT);
485 return;
486 }
487
488 count = uart_circ_chars_pending(xmit);

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537
538 stm32_usart_set_bits(port, ofs->cr3, USART_CR3_DMAT);
539
540 xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
541 port->icount.tx += count;
542 return;
543
544fallback_err:
545 for (i = count; i > 0; i--)
546 stm32_usart_transmit_chars_pio(port);
545 stm32_usart_transmit_chars_pio(port);
547}
548
549static void stm32_usart_transmit_chars(struct uart_port *port)
550{
551 struct stm32_port *stm32_port = to_stm32_port(port);
552 const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
553 struct circ_buf *xmit = &port->state->xmit;
554

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547
548static void stm32_usart_transmit_chars(struct uart_port *port)
549{
550 struct stm32_port *stm32_port = to_stm32_port(port);
551 const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
552 struct circ_buf *xmit = &port->state->xmit;
553

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