[PATCH 2.6 SERIAL] Add support for word-length UART registers.

[PATCH 2.6 SERIAL] Add support for word-length UART registers.

[Deepak Saxena]

UARTS on several Intel IXP2000 systems are connected in such
a way that they can only be addressed using full word accesses
instead of bytes. Following patch adds a UPIO_MEM32 io-type to
identify these UARTs.

Please apply,
~Deepak

Signed-off-by: Deepak Saxena <dsaxena@plexity.net>

===== drivers/serial/8250.c 1.57 vs edited =====
--- 1.57/drivers/serial/8250.c	Mon Jul  5 03:33:38 2004
+++ edited/drivers/serial/8250.c	Thu Sep  9 14:22:07 2004
@@ -187,6 +187,9 @@
 	case UPIO_MEM:
 		return readb(up->port.membase + offset);
 
+	case UPIO_MEM32:
+		return readl(up->port.membase + offset);
+
 	default:
 		return inb(up->port.iobase + offset);
 	}
@@ -205,6 +208,10 @@
 
 	case UPIO_MEM:
 		writeb(value, up->port.membase + offset);
+		break;
+
+	case UPIO_MEM32:
+		writel(value, up->port.membase + offset);
 		break;
 
 	default:
===== drivers/serial/serial_core.c 1.87 vs edited =====
--- 1.87/drivers/serial/serial_core.c	Tue Jun 29 07:43:58 2004
+++ edited/drivers/serial/serial_core.c	Thu Sep  9 15:02:33 2004
@@ -1978,6 +1978,7 @@
 		printk("I/O 0x%x offset 0x%x", port->iobase, port->hub6);
 		break;
 	case UPIO_MEM:
+	case UPIO_MEM32:
 		printk("MMIO 0x%lx", port->mapbase);
 		break;
 	}
===== include/linux/serial_core.h 1.42 vs edited =====
--- 1.42/include/linux/serial_core.h	Thu Jul 29 06:12:47 2004
+++ edited/include/linux/serial_core.h	Thu Sep  9 14:18:25 2004
@@ -176,6 +176,7 @@
 #define UPIO_PORT		(0)
 #define UPIO_HUB6		(1)
 #define UPIO_MEM		(2)
+#define UPIO_MEM32		(3)
 
 	unsigned int		read_status_mask;	/* driver specific */
 	unsigned int		ignore_status_mask;	/* driver specific */


-- 
Deepak Saxena - dsaxena at plexity dot net - http://www.plexity.net/

"Unlike me, many of you have accepted the situation of your imprisonment
and will die here like rotten cabbages." - Number 6

Re: [PATCH 2.6 SERIAL] Add support for word-length UART registers.

[Deepak Saxena]

On Sep 09 2004, at 16:19, Deepak Saxena was caught saying:
> 
> 
> UARTS on several Intel IXP2000 systems are connected in such
> a way that they can only be addressed using full word accesses

s/word/long/ in linux-speak.

~Deepak

-- 
Deepak Saxena - dsaxena at plexity dot net - http://www.plexity.net/

"Unlike me, many of you have accepted the situation of your imprisonment
and will die here like rotten cabbages." - Number 6