linux-kernel - [PATCH 01/20] serial: stm32: adding fifo support

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Date:   Mon, 26 Jun 2017 12:49:09 +0000
From:   Bich HEMON <bich.hemon@...com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre TORGUE <alexandre.torgue@...com>,
        "Jiri Slaby" <jslaby@...e.com>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Bich HEMON <bich.hemon@...com>
Subject: [PATCH 01/20] serial: stm32: adding fifo support

From: Bich Hemon <bich.hemon@...com>

This patch adds fifo mode support for rx and tx.

Signed-off-by: Gerald Baeza <gerald.baeza@...com>
---
 drivers/tty/serial/stm32-usart.c | 3 +++
 drivers/tty/serial/stm32-usart.h | 1 +
 2 files changed, 4 insertions(+)

diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 0338562..50948f6 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -453,6 +453,7 @@ static int stm32_startup(struct uart_port *port)
 		return ret;
 
 	val = USART_CR1_RXNEIE | USART_CR1_TE | USART_CR1_RE;
+	val |= USART_CR1_FIFOEN;
 	stm32_set_bits(port, ofs->cr1, val);
 
 	return 0;
@@ -467,6 +468,7 @@ static void stm32_shutdown(struct uart_port *port)
 
 	val = USART_CR1_TXEIE | USART_CR1_RXNEIE | USART_CR1_TE | USART_CR1_RE;
 	val |= BIT(cfg->uart_enable_bit);
+	val |= USART_CR1_FIFOEN;
 	stm32_clr_bits(port, ofs->cr1, val);
 
 	free_irq(port->irq, port);
@@ -496,6 +498,7 @@ static void stm32_set_termios(struct uart_port *port, struct ktermios *termios,
 
 	cr1 = USART_CR1_TE | USART_CR1_RE | USART_CR1_RXNEIE;
 	cr1 |= BIT(cfg->uart_enable_bit);
+	cr1 |= USART_CR1_FIFOEN;
 	cr2 = 0;
 	cr3 = 0;
 
diff --git a/drivers/tty/serial/stm32-usart.h b/drivers/tty/serial/stm32-usart.h
index cd97ceb..9f0d0e8 100644
--- a/drivers/tty/serial/stm32-usart.h
+++ b/drivers/tty/serial/stm32-usart.h
@@ -134,6 +134,7 @@ struct stm32_usart_info stm32f7_info = {
 #define USART_CR1_EOBIE		BIT(27)		/* F7 */
 #define USART_CR1_M1		BIT(28)		/* F7 */
 #define USART_CR1_IE_MASK	(GENMASK(8, 4) | BIT(14) | BIT(26) | BIT(27))
+#define USART_CR1_FIFOEN	BIT(29)		/* H7 */
 
 /* USART_CR2 */
 #define USART_CR2_ADD_MASK	GENMASK(3, 0)	/* F4 */
-- 
1.9.1