ARM: EXYNOS: Avoid early use of of_machine_is_compatible()
The recent commit "ARM: EXYNOS: add support for EXYNOS5440 SoC" broke
support for exynos5250 because of_machine_is_compatible() was used too
early in the boot process. It also probably meant that the exynos5440
failed to use the proper iotable. Switch to use
of_flat_dt_is_compatible() in both of these cases.
The failure I was seeing in exynos5250 because of this was:
Division by zero in kernel.
[<80015ed4>] (unwind_backtrace+0x0/0xec) from [<8045c7a4>] (dump_stack+0x20/0x24)
[<8045c7a4>] (dump_stack+0x20/0x24) from [<80012990>] (__div0+0x20/0x28)
[<80012990>] (__div0+0x20/0x28) from [<8021ab04>] (Ldiv0_64+0x8/0x18)
[<8021ab04>] (Ldiv0_64+0x8/0x18) from [<80068560>] (__clocksource_updatefreq_scale+0x54/0x134)
[<80068560>] (__clocksource_updatefreq_scale+0x54/0x134) from [<8006865c>] (__clocksource_register_scale+0x1c/0x54)
[<8006865c>] (__clocksource_register_scale+0x1c/0x54) from [<80612a18>] (exynos_timer_init+0x100/0x1e8)
[<80612a18>] (exynos_timer_init+0x100/0x1e8) from [<8060d184>] (time_init+0x28/0x38)
[<8060d184>] (time_init+0x28/0x38) from [<8060a754>] (start_kernel+0x1e0/0x3c8)
[<8060a754>] (start_kernel+0x1e0/0x3c8) from [<40008078>] (0x40008078)
Signed-off-by: Doug Anderson <dianders@chromium.org>
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
[olofj: fixed two build errors, one missing include and one !CONFIG_OF failure]
Signed-off-by: Olof Johansson <olof@lixom.net>
diff --git a/arch/arm/mach-exynos/common.c b/arch/arm/mach-exynos/common.c
index 94f1ded..68b4b8e 100644
--- a/arch/arm/mach-exynos/common.c
+++ b/arch/arm/mach-exynos/common.c
@@ -18,6 +18,7 @@
#include <linux/sched.h>
#include <linux/serial_core.h>
#include <linux/of.h>
+#include <linux/of_fdt.h>
#include <linux/of_irq.h>
#include <linux/export.h>
#include <linux/irqdomain.h>
@@ -121,6 +122,7 @@
},
};
+#ifdef CONFIG_ARCH_EXYNOS5
static struct map_desc exynos5440_iodesc[] __initdata = {
{
.virtual = (unsigned long)S5P_VA_CHIPID,
@@ -129,6 +131,7 @@
.type = MT_DEVICE,
},
};
+#endif
static struct map_desc exynos4_iodesc[] __initdata = {
{
@@ -346,11 +349,19 @@
void __init exynos_init_io(struct map_desc *mach_desc, int size)
{
+ struct map_desc *iodesc = exynos_iodesc;
+ int iodesc_sz = ARRAY_SIZE(exynos_iodesc);
+#if defined(CONFIG_OF) && defined(CONFIG_ARCH_EXYNOS5)
+ unsigned long root = of_get_flat_dt_root();
+
/* initialize the io descriptors we need for initialization */
- if (of_machine_is_compatible("samsung,exynos5440"))
- iotable_init(exynos5440_iodesc, ARRAY_SIZE(exynos5440_iodesc));
- else
- iotable_init(exynos_iodesc, ARRAY_SIZE(exynos_iodesc));
+ if (of_flat_dt_is_compatible(root, "samsung,exynos5440")) {
+ iodesc = exynos5440_iodesc;
+ iodesc_sz = ARRAY_SIZE(exynos5440_iodesc);
+ }
+#endif
+
+ iotable_init(iodesc, iodesc_sz);
if (mach_desc)
iotable_init(mach_desc, size);