[PATCH/RFC 4/8] serial: pxa: Add fifo-size and {big,native}-endian properties

[Kevin Cernekee <cernekee@gmail.com>]

With a few tweaks, the PXA serial driver can handle other 16550A clones.
Add a fifo-size DT property to override the FIFO depth (BCM7xxx uses 32),
and {native,big}-endian properties similar to regmap to support SoCs that
have BE or "automagic endian" registers.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
---
 drivers/tty/serial/pxa.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/pxa.c b/drivers/tty/serial/pxa.c
index 21b7d8b..78ed7ee 100644
--- a/drivers/tty/serial/pxa.c
+++ b/drivers/tty/serial/pxa.c
@@ -60,13 +60,19 @@ struct uart_pxa_port {
 static inline unsigned int serial_in(struct uart_pxa_port *up, int offset)
 {
 	offset <<= 2;
-	return readl(up->port.membase + offset);
+	if (!up->port.big_endian)
+		return readl(up->port.membase + offset);
+	else
+		return ioread32be(up->port.membase + offset);
 }
 
 static inline void serial_out(struct uart_pxa_port *up, int offset, int value)
 {
 	offset <<= 2;
-	writel(value, up->port.membase + offset);
+	if (!up->port.big_endian)
+		writel(value, up->port.membase + offset);
+	else
+		iowrite32be(value, up->port.membase + offset);
 }
 
 static void serial_pxa_enable_ms(struct uart_port *port)
@@ -833,6 +839,7 @@ static int serial_pxa_probe_dt(struct platform_device *pdev,
 {
 	struct device_node *np = pdev->dev.of_node;
 	int ret;
+	u32 val;
 
 	if (!np)
 		return 1;
@@ -843,6 +850,11 @@ static int serial_pxa_probe_dt(struct platform_device *pdev,
 		return ret;
 	}
 	sport->port.line = ret;
+
+	if (of_property_read_u32(np, "fifo-size", &val) == 0)
+		sport->port.fifosize = val;
+	sport->port.big_endian = of_device_is_big_endian(np);
+
 	return 0;
 }
 
-- 
2.1.1