[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, 17 insertions, 1 deletions

diff --git a/arch/arm/mach-pxa/generic.c b/arch/arm/mach-pxa/generic.c
index 719b91e93fa2..218eb9671fa3 100644
--- a/arch/arm/mach-pxa/generic.c
+++ b/arch/arm/mach-pxa/generic.c
@@ -253,6 +253,10 @@ static struct platform_device stuart_device = {
         .name           = "pxa2xx-uart",
         .id             = 2,
 };
+static struct platform_device hwuart_device = {
+        .name           = "pxa2xx-uart",
+        .id             = 3,
+};
 
 static struct resource i2c_resources[] = {
         {
@@ -310,7 +314,19 @@ static struct platform_device *devices[] __initdata = {
 
 static int __init pxa_init(void)
 {
-        return platform_add_devices(devices, ARRAY_SIZE(devices));
+        int cpuid, ret;
+
+        ret = platform_add_devices(devices, ARRAY_SIZE(devices));
+        if (ret)
+                return ret;
+
+        /* Only add HWUART for PXA255/26x; PXA210/250/27x do not have it. */
+        cpuid = read_cpuid(CPUID_ID);
+        if (((cpuid >> 4) & 0xfff) == 0x2d0 ||
+            ((cpuid >> 4) & 0xfff) == 0x290)
+                ret = platform_device_register(&hwuart_device);
+
+        return ret;
 }
 
 subsys_initcall(pxa_init);