ARM: OMAP4: Fix NULL pointer dereference crash.

After the patch series "[PATCH 00/14] OMAP PM fixes for .31-rc"
merge in 2.6.31-rc5, the kernel crashed during boot on OMAP4430.
This patch fixes it by adding UART4 support and related code.
Without this patch omap_serial_init() would produce " NULL pointer
dereference" and kernel crashes in the bootup on OMAP4430 platform.

Some more info on the merge issue can be found here.
More info- http://lkml.org/lkml/2009/8/20/192

Note: While merging this patch,"IO_ADDRESS" needs to be changed
to "OMAP2_IO_ADDRESS" if the Tony's below series is already merged in.
http://www.mail-archive.com/linux-omap@vger.kernel.org/msg15072.html

Signed-off-by: Syed Rafiuddin <rafiuddin.syed@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
index dd3c735b5588..645546cbd265 100644
--- a/arch/arm/mach-omap2/serial.c
+++ b/arch/arm/mach-omap2/serial.c
@@ -113,6 +113,21 @@ static struct plat_serial8250_port serial_platform_data2[] = {
         }
 };
 
+#ifdef CONFIG_ARCH_OMAP4
+static struct plat_serial8250_port serial_platform_data3[] = {
+        {
+                .membase        = IO_ADDRESS(OMAP_UART4_BASE),
+                .mapbase        = OMAP_UART4_BASE,
+                .irq            = 70,
+                .flags          = UPF_BOOT_AUTOCONF,
+                .iotype         = UPIO_MEM,
+                .regshift       = 2,
+                .uartclk        = OMAP24XX_BASE_BAUD * 16,
+        }, {
+                .flags          = 0
+        }
+};
+#endif
 static inline unsigned int serial_read_reg(struct plat_serial8250_port *up,
                                            int offset)
 {
@@ -550,6 +565,17 @@ static struct omap_uart_state omap_uart[OMAP_MAX_NR_PORTS] = {
                         },
                 },
         },
+#ifdef CONFIG_ARCH_OMAP4
+        {
+                .pdev = {
+                        .name                   = "serial8250",
+                        .id                     = 3
+                        .dev                    = {
+                                .platform_data  = serial_platform_data3,
+                        },
+                },
+        },
+#endif
 };
 
 void __init omap_serial_init(void)