[ARM] 3029/1: Add HWUART support for PXA 255/26x

Patch from Matt Reimer

Adds support for HWUART on PXA 255 / 26x. This patch originally came from
http://svn.rungie.com/svn/gumstix-buildroot/trunk/sources/kernel-patches/000-gumstix-hwuart.patch
and has been tweaked by me.

Signed-off-by: Matt Reimer <mreimer@vpop.net>
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 20 insertions, 1 deletions

diff --git a/drivers/serial/pxa.c b/drivers/serial/pxa.c
index 90c2a86c421b..005f027e081a 100644
--- a/drivers/serial/pxa.c
+++ b/drivers/serial/pxa.c
@@ -358,6 +358,9 @@ static int serial_pxa_startup(struct uart_port *port)
         unsigned long flags;
         int retval;
 
+        if (port->line == 3) /* HWUART */
+                up->mcr |= UART_MCR_AFE;
+        else
         up->mcr = 0;
 
         /*
@@ -481,8 +484,10 @@ serial_pxa_set_termios(struct uart_port *port, struct termios *termios,
 
         if ((up->port.uartclk / quot) < (2400 * 16))
                 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR1;
-        else
+        else if ((up->port.uartclk / quot) < (230400 * 16))
                 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR8;
+        else
+                fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR32;
 
         /*
          * Ok, we're now changing the port state.  Do it with
@@ -772,6 +777,20 @@ static struct uart_pxa_port serial_pxa_ports[] = {
                 .ops            = &serial_pxa_pops,
                 .line           = 2,
         },
+  }, {  /* HWUART */
+        .name   = "HWUART",
+        .cken   = CKEN4_HWUART,
+        .port = {
+                .type           = PORT_PXA,
+                .iotype         = UPIO_MEM,
+                .membase        = (void *)&HWUART,
+                .mapbase        = __PREG(HWUART),
+                .irq            = IRQ_HWUART,
+                .uartclk        = 921600 * 16,
+                .fifosize       = 64,
+                .ops            = &serial_pxa_pops,
+                .line           = 3,
+        },
   }
 };