From: Andrey Smirnov <andrew.smirnov@gmail.com>
To: linux-serial@vger.kernel.org
Cc: Andrey Smirnov <andrew.smirnov@gmail.com>,
Stefan Agner <stefan@agner.ch>, Chris Healy <cphealy@gmail.com>,
Cory Tusar <cory.tusar@zii.aero>,
Lucas Stach <l.stach@pengutronix.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jslaby@suse.com>,
linux-imx@nxp.com, linux-kernel@vger.kernel.org
Subject: [PATCH v3 1/6] tty: serial: fsl_lpuart: Introduce lpuart_tx_dma_startup()
Date: Mon, 5 Aug 2019 11:56:56 -0700 [thread overview]
Message-ID: <20190805185701.22863-2-andrew.smirnov@gmail.com> (raw)
In-Reply-To: <20190805185701.22863-1-andrew.smirnov@gmail.com>
Code configure DMA TX path in lpuart_startup(), lpuart32_startup() and
lpuart_resume() is doing exactly the same thing, so move it into a
standalone subroutine.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Cc: Stefan Agner <stefan@agner.ch>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Cory Tusar <cory.tusar@zii.aero>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: linux-imx@nxp.com
Cc: linux-serial@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
---
drivers/tty/serial/fsl_lpuart.c | 53 ++++++++++++++-------------------
1 file changed, 23 insertions(+), 30 deletions(-)
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 0e09e6dc5ccb..9da4529ee223 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1435,6 +1435,26 @@ static void rx_dma_timer_init(struct lpuart_port *sport)
add_timer(&sport->lpuart_timer);
}
+static void lpuart_tx_dma_startup(struct lpuart_port *sport)
+{
+ u32 uartbaud;
+
+ if (sport->dma_tx_chan && !lpuart_dma_tx_request(&sport->port)) {
+ init_waitqueue_head(&sport->dma_wait);
+ sport->lpuart_dma_tx_use = true;
+ if (lpuart_is_32(sport)) {
+ uartbaud = lpuart32_read(&sport->port, UARTBAUD);
+ lpuart32_write(&sport->port,
+ uartbaud | UARTBAUD_TDMAE, UARTBAUD);
+ } else {
+ writeb(readb(sport->port.membase + UARTCR5) |
+ UARTCR5_TDMAS, sport->port.membase + UARTCR5);
+ }
+ } else {
+ sport->lpuart_dma_tx_use = false;
+ }
+}
+
static int lpuart_startup(struct uart_port *port)
{
struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
@@ -1471,14 +1491,7 @@ static int lpuart_startup(struct uart_port *port)
sport->lpuart_dma_rx_use = false;
}
- if (sport->dma_tx_chan && !lpuart_dma_tx_request(port)) {
- init_waitqueue_head(&sport->dma_wait);
- sport->lpuart_dma_tx_use = true;
- temp = readb(port->membase + UARTCR5);
- writeb(temp | UARTCR5_TDMAS, port->membase + UARTCR5);
- } else {
- sport->lpuart_dma_tx_use = false;
- }
+ lpuart_tx_dma_startup(sport);
spin_unlock_irqrestore(&sport->port.lock, flags);
@@ -1521,14 +1534,7 @@ static int lpuart32_startup(struct uart_port *port)
sport->lpuart_dma_rx_use = false;
}
- if (sport->dma_tx_chan && !lpuart_dma_tx_request(port)) {
- init_waitqueue_head(&sport->dma_wait);
- sport->lpuart_dma_tx_use = true;
- temp = lpuart32_read(&sport->port, UARTBAUD);
- lpuart32_write(&sport->port, temp | UARTBAUD_TDMAE, UARTBAUD);
- } else {
- sport->lpuart_dma_tx_use = false;
- }
+ lpuart_tx_dma_startup(sport);
if (sport->lpuart_dma_rx_use) {
/* RXWATER must be 0 */
@@ -2577,20 +2583,7 @@ static int lpuart_resume(struct device *dev)
}
}
- if (sport->dma_tx_chan && !lpuart_dma_tx_request(&sport->port)) {
- init_waitqueue_head(&sport->dma_wait);
- sport->lpuart_dma_tx_use = true;
- if (lpuart_is_32(sport)) {
- temp = lpuart32_read(&sport->port, UARTBAUD);
- lpuart32_write(&sport->port,
- temp | UARTBAUD_TDMAE, UARTBAUD);
- } else {
- writeb(readb(sport->port.membase + UARTCR5) |
- UARTCR5_TDMAS, sport->port.membase + UARTCR5);
- }
- } else {
- sport->lpuart_dma_tx_use = false;
- }
+ lpuart_tx_dma_startup(sport);
if (lpuart_is_32(sport)) {
if (sport->lpuart_dma_rx_use) {
--
2.21.0
next prev parent reply other threads:[~2019-08-05 18:56 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-05 18:56 [PATCH v3 0/6] LPUART fixes and improvements Andrey Smirnov
2019-08-05 18:56 ` Andrey Smirnov [this message]
2019-08-05 18:56 ` [PATCH v3 2/6] tty: serial: fsl_lpuart: Introduce lpuart_rx_dma_startup() Andrey Smirnov
2019-08-05 18:56 ` [PATCH v3 3/6] tty: serial: fsl_lpuart: Introduce lpuart32_configure() Andrey Smirnov
2019-08-05 18:56 ` [PATCH v3 4/6] tty: serial: fsl_lpuart: Introduce lpuart*_setup_watermark_enable() Andrey Smirnov
2019-08-05 18:57 ` [PATCH v3 5/6] tty: serial: fsl_lpuart: Don't enable TIE in .startup() or .resume() Andrey Smirnov
2019-08-05 18:57 ` [PATCH v3 6/6] tty: serial: fsl_lpuart: Ignore TX/RX interrupts if DMA is enabled Andrey Smirnov
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