ARM: EXYNOS: Add a platform bus notifier to set dma masks for Exynos5440

Use a platform bus notifier callback function to set the correct
dma_mask and coherent_dma_mask for every device registered on
Exynos5440 based machine.

Signed-off-by: Thomas Abraham <thomas.ab@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

diff --git a/arch/arm/mach-exynos/mach-exynos5-dt.c b/arch/arm/mach-exynos/mach-exynos5-dt.c
index 753b94f3fca7e3ba4c3895582f638e6c395e60fd..e47c2a5d60f94be5a05919be439c65738e60d07b 100644 (file)
--- a/arch/arm/mach-exynos/mach-exynos5-dt.c
+++ b/arch/arm/mach-exynos/mach-exynos5-dt.c
@@ -14,6 +14,7 @@
 #include <linux/memblock.h>
 #include <linux/io.h>
 #include <linux/clocksource.h>
+#include <linux/dma-mapping.h>
 
 #include <asm/mach/arch.h>
 #include <mach/regs-pmu.h>
@@ -23,11 +24,30 @@
 
 #include "common.h"
 
+static u64 dma_mask64 = DMA_BIT_MASK(64);
+
 static void __init exynos5_dt_map_io(void)
 {
        exynos_init_io(NULL, 0);
 }
 
+static int exynos5440_platform_notifier(struct notifier_block *nb,
+                                 unsigned long event, void *__dev)
+{
+       struct device *dev = __dev;
+
+       if (event != BUS_NOTIFY_ADD_DEVICE)
+               return NOTIFY_DONE;
+
+       dev->dma_mask = &dma_mask64;
+       dev->coherent_dma_mask = DMA_BIT_MASK(64);
+       return NOTIFY_OK;
+}
+
+static struct notifier_block exynos5440_platform_nb = {
+       .notifier_call = exynos5440_platform_notifier,
+};
+
 static void __init exynos5_dt_machine_init(void)
 {
        struct device_node *i2c_np;
@@ -52,6 +72,9 @@ static void __init exynos5_dt_machine_init(void)
                }
        }
 
+       if (of_machine_is_compatible("samsung,exynos5440"))
+               bus_register_notifier(&platform_bus_type, &exynos5440_platform_nb);
+
        of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 }