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authorSantosh Shilimkar <santosh.shilimkar@ti.com>2009-08-22 13:30:11 +0530
committerKevin Hilman <khilman@deeprootsystems.com>2009-09-02 15:07:53 -0700
commit0e3eaadfe3da84f98250ad8a2c36e87fe00e42ee (patch)
tree1404b0951aa4489b0992c04ca212d2002b503a95 /arch/arm
parent36d568ec055cb3ac4507d38ebabba955cdbb443e (diff)
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>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/mach-omap2/serial.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
index dd3c735b558..645546cbd26 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)