serial: 8250_dw: Add support for big-endian MMIO accesses

Add support for UPIO_MEM32BE in addition to UPIO_MEM32.

For big endian we use 2 new accessors similar to little endian,
called dw8250_serial_out32be() and dw8250_serial_in32be().

Signed-off-by: Noam Camus <noamc@ezchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index ffe5e0cb1f053a9d7fd2b28f4b5f90ead8ce2b98..92c4a9bc2e6d15258bdf5c0e38ea22c8a0b42f70 100644 (file)
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -182,6 +182,24 @@ static unsigned int dw8250_serial_in32(struct uart_port *p, int offset)
        return dw8250_modify_msr(p, offset, value);
 }
 
+static void dw8250_serial_out32be(struct uart_port *p, int offset, int value)
+{
+       struct dw8250_data *d = p->private_data;
+
+       iowrite32be(value, p->membase + (offset << p->regshift));
+
+       if (offset == UART_LCR && !d->uart_16550_compatible)
+               dw8250_check_lcr(p, value);
+}
+
+static unsigned int dw8250_serial_in32be(struct uart_port *p, int offset)
+{
+       unsigned int value = ioread32be(p->membase + (offset << p->regshift));
+
+       return dw8250_modify_msr(p, offset, value);
+}
+
+
 static int dw8250_handle_irq(struct uart_port *p)
 {
        struct dw8250_data *d = p->private_data;
@@ -276,6 +294,11 @@ static void dw8250_quirks(struct uart_port *p, struct dw8250_data *data)
                        data->skip_autocfg = true;
                }
 #endif
+               if (of_device_is_big_endian(p->dev->of_node)) {
+                       p->iotype = UPIO_MEM32BE;
+                       p->serial_in = dw8250_serial_in32be;
+                       p->serial_out = dw8250_serial_out32be;
+               }
        } else if (has_acpi_companion(p->dev)) {
                p->iotype = UPIO_MEM32;
                p->regshift = 2;