[PATCH v3 3/6] serial: imx: Simplify DMA disablement
From: martyn.welch@collabora.co.uk (Martyn Welch)
Date: 2017-09-21 16:18:29
Also in:
linux-serial, lkml
Subsystem:
the rest, tty layer and serial drivers · Maintainers:
Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
From: Nandor Han <redacted> This commits simplify the function imx_disable_dma() by moving the code for disabling RX and TX DMAs to dedicated functions. This is a preparation for the next commit. Signed-off-by: Nandor Han <redacted> Signed-off-by: Romain Perier <redacted> Signed-off-by: Martyn Welch <martyn.welch@collabora.co.uk> --- drivers/tty/serial/imx.c | 27 ++++++++++++++++++++------- 1 file changed, 20 insertions(+), 7 deletions(-)
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 7835279..2fb3210 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c@@ -350,6 +350,24 @@ static void imx_port_rts_auto(struct imx_port *sport, unsigned long *ucr2) *ucr2 |= UCR2_CTSC; } +static void imx_stop_tx_dma(struct imx_port *sport) +{ + unsigned long temp; + + temp = readl(sport->port.membase + UCR1); + temp &= ~UCR1_TDMAEN; + writel(temp, sport->port.membase + UCR1); +} + +static void imx_stop_rx_dma(struct imx_port *sport) +{ + unsigned long temp; + + temp = readl(sport->port.membase + UCR1); + temp &= ~(UCR1_RDMAEN | UCR1_ATDMAEN); + writel(temp, sport->port.membase + UCR1); +} + /* * interrupts disabled on entry */
@@ -1217,13 +1235,8 @@ static void imx_enable_dma(struct imx_port *sport) static void imx_disable_dma(struct imx_port *sport) { - unsigned long temp; - - /* clear UCR1 */ - temp = readl(sport->port.membase + UCR1); - temp &= ~(UCR1_RDMAEN | UCR1_TDMAEN | UCR1_ATDMAEN); - writel(temp, sport->port.membase + UCR1); - + imx_stop_rx_dma(sport); + imx_stop_tx_dma(sport); imx_setup_ufcr(sport, TXTL_DEFAULT, RXTL_DEFAULT); sport->dma_is_enabled = 0;
--
1.8.3.1