linux-kernel - [PATCH v2] serial: pl011: Add Device Tree support to request DMA channels

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Date:	Thu, 18 Apr 2013 09:14:16 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:	arnd@...db.de, linus.walleij@...ricsson.com,
	Lee Jones <lee.jones@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH v2] serial: pl011: Add Device Tree support to request DMA channels

The new DMA API is operational. It is now possible to request DMA
channels from information passed via Device Tree.

Cc: Russell King <linux@....linux.org.uk>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Jiri Slaby <jslaby@...e.cz>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
---
 drivers/tty/serial/amba-pl011.c |   19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index 3ea5408..1b39f58 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -249,6 +249,7 @@ static void pl011_dma_probe_initcall(struct uart_amba_port *uap)
 {
 	/* DMA is the sole user of the platform data right now */
 	struct amba_pl011_data *plat = uap->port.dev->platform_data;
+	struct device_node *np = uap->port.dev->of_node;
 	struct dma_slave_config tx_conf = {
 		.dst_addr = uap->port.mapbase + UART01x_DR,
 		.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
@@ -259,9 +260,9 @@ static void pl011_dma_probe_initcall(struct uart_amba_port *uap)
 	struct dma_chan *chan;
 	dma_cap_mask_t mask;
 
-	/* We need platform data */
-	if (!plat || !plat->dma_filter) {
-		dev_info(uap->port.dev, "no DMA platform data\n");
+	/* We need platform data or DT */
+	if (!(plat && plat->dma_filter) && !np) {
+		dev_info(uap->port.dev, "no DMA platform data or DT\n");
 		return;
 	}
 
@@ -269,7 +270,10 @@ static void pl011_dma_probe_initcall(struct uart_amba_port *uap)
 	dma_cap_zero(mask);
 	dma_cap_set(DMA_SLAVE, mask);
 
-	chan = dma_request_channel(mask, plat->dma_filter, plat->dma_tx_param);
+	chan = dma_request_slave_channel_compat(mask,
+				(plat) ? plat->dma_filter : NULL,
+				(plat) ? plat->dma_tx_param : NULL,
+				uap->port.dev, "tx");
 	if (!chan) {
 		dev_err(uap->port.dev, "no TX DMA channel!\n");
 		return;
@@ -282,7 +286,7 @@ static void pl011_dma_probe_initcall(struct uart_amba_port *uap)
 		 dma_chan_name(uap->dmatx.chan));
 
 	/* Optionally make use of an RX channel as well */
-	if (plat->dma_rx_param) {
+	if ((plat && plat->dma_rx_param) || np) {
 		struct dma_slave_config rx_conf = {
 			.src_addr = uap->port.mapbase + UART01x_DR,
 			.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
@@ -291,7 +295,10 @@ static void pl011_dma_probe_initcall(struct uart_amba_port *uap)
 			.device_fc = false,
 		};
 
-		chan = dma_request_channel(mask, plat->dma_filter, plat->dma_rx_param);
+		chan = dma_request_slave_channel_compat(mask,
+					(plat) ? plat->dma_filter : NULL,
+					(plat) ? plat->dma_rx_param : NULL,
+					uap->port.dev, "rx");
 		if (!chan) {
 			dev_err(uap->port.dev, "no RX DMA channel!\n");
 			return;
-- 
1.7.10.4

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