diff mbox

[06/13] tty: serial: 8250: allow to use custom DMA implementation

Message ID 1412014009-13315-7-git-send-email-bigeasy@linutronix.de (mailing list archive)
State New, archived
Headers show

Commit Message

Sebastian Andrzej Siewior Sept. 29, 2014, 6:06 p.m. UTC
The OMAP has a few corner cases where it needs a share of kindness of
affection to do the right thing. Heikki Krogerus suggested that instead
adding the quirks into the default DMA implementation, OMAP could get
its own copy of the function. And Alan suggested the same thing so here
we go.

This patch provides callbacks for custom TX/RX DMA implementation. If
there are not setup / used, then the default (current) implementation is
used.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/tty/serial/8250/8250.h      |  3 +++
 drivers/tty/serial/8250/8250_core.c | 11 ++++++++---
 drivers/tty/serial/8250/8250_dma.c  |  2 --
 3 files changed, 11 insertions(+), 5 deletions(-)
diff mbox

Patch

diff --git a/drivers/tty/serial/8250/8250.h b/drivers/tty/serial/8250/8250.h
index ebab625179d4..4bb831ab5db0 100644
--- a/drivers/tty/serial/8250/8250.h
+++ b/drivers/tty/serial/8250/8250.h
@@ -16,6 +16,9 @@ 
 #include <linux/dmaengine.h>
 
 struct uart_8250_dma {
+	int (*tx_dma)(struct uart_8250_port *p);
+	int (*rx_dma)(struct uart_8250_port *p, unsigned int iir);
+
 	dma_filter_fn		fn;
 	void			*rx_param;
 	void			*tx_param;
diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index ea57c87f8528..93b0799936fd 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -1350,7 +1350,7 @@  static void serial8250_start_tx(struct uart_port *port)
 	struct uart_8250_port *up = up_to_u8250p(port);
 
 	serial8250_rpm_get_tx(up);
-	if (up->dma && !serial8250_tx_dma(up)) {
+	if (up->dma && !up->dma->tx_dma(up)) {
 		return;
 	} else if (!(up->ier & UART_IER_THRI)) {
 		up->ier |= UART_IER_THRI;
@@ -1588,7 +1588,7 @@  int serial8250_handle_irq(struct uart_port *port, unsigned int iir)
 
 	if (status & (UART_LSR_DR | UART_LSR_BI)) {
 		if (up->dma)
-			dma_err = serial8250_rx_dma(up, iir);
+			dma_err = up->dma->rx_dma(up, iir);
 
 		if (!up->dma || dma_err)
 			status = serial8250_rx_chars(up, status);
@@ -3624,8 +3624,13 @@  int serial8250_register_8250_port(struct uart_8250_port *up)
 			uart->dl_read = up->dl_read;
 		if (up->dl_write)
 			uart->dl_write = up->dl_write;
-		if (up->dma)
+		if (up->dma) {
 			uart->dma = up->dma;
+			if (!uart->dma->tx_dma)
+				uart->dma->tx_dma = serial8250_tx_dma;
+			if (!uart->dma->rx_dma)
+				uart->dma->rx_dma = serial8250_rx_dma;
+		}
 
 		if (serial8250_isa_config != NULL)
 			serial8250_isa_config(0, &uart->port,
diff --git a/drivers/tty/serial/8250/8250_dma.c b/drivers/tty/serial/8250/8250_dma.c
index db9eda3c12d6..258430b72039 100644
--- a/drivers/tty/serial/8250/8250_dma.c
+++ b/drivers/tty/serial/8250/8250_dma.c
@@ -118,7 +118,6 @@  int serial8250_tx_dma(struct uart_8250_port *p)
 	dma->tx_err = 1;
 	return ret;
 }
-EXPORT_SYMBOL_GPL(serial8250_tx_dma);
 
 int serial8250_rx_dma(struct uart_8250_port *p, unsigned int iir)
 {
@@ -165,7 +164,6 @@  int serial8250_rx_dma(struct uart_8250_port *p, unsigned int iir)
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(serial8250_rx_dma);
 
 int serial8250_request_dma(struct uart_8250_port *p)
 {