This patch is an example how CMA can be activated for particular devices
in the system. It creates one CMA region and assigns it to all s5p-fimc
devices on Samsung Aquila S5PC110 board.
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
arch/arm/mach-s5pv210/Kconfig | 1 +
arch/arm/mach-s5pv210/mach-aquila.c | 26 ++++++++++++++++++++++++++
2 files changed, 27 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-s5pv210/Kconfig b/arch/arm/mach-s5pv210/Kconfig
index 37b5a97..c09a92c 100644
--- a/arch/arm/mach-s5pv210/Kconfig
+++ b/arch/arm/mach-s5pv210/Kconfig
@@ -64,6 +64,7 @@ menu "S5PC110 Machines"
config MACH_AQUILA
bool "Aquila"
select CPU_S5PV210
+ select CMA
select S3C_DEV_FB
select S5P_DEV_FIMC0
select S5P_DEV_FIMC1
diff --git a/arch/arm/mach-s5pv210/mach-aquila.c b/arch/arm/mach-s5pv210/mach-aquila.c
index 4e1d8ff..8c404e5 100644
--- a/arch/arm/mach-s5pv210/mach-aquila.c
+++ b/arch/arm/mach-s5pv210/mach-aquila.c
@@ -21,6 +21,8 @@
#include <linux/gpio_keys.h>
#include <linux/input.h>
#include <linux/gpio.h>
+#include <linux/cma.h>
+#include <linux/dma-mapping.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
@@ -650,6 +652,19 @@ static void __init aquila_map_io(void)
s5p_set_timer_source(S5P_PWM3, S5P_PWM4);
}
+unsigned long cma_area_start;
+unsigned long cma_area_size = 32 << 20;
+
+static void __init aquila_reserve(void)
+{
+ unsigned long ret = cma_reserve(cma_area_start, cma_area_size);
+
+ if (!IS_ERR_VALUE(ret)) {
+ cma_area_start = ret;
+ printk(KERN_INFO "cma: reserved %ld bytes at %lx\n", cma_area_size, cma_area_start);
+ }
+}
+
static void __init aquila_machine_init(void)
{
/* PMIC */
@@ -672,6 +687,16 @@ static void __init aquila_machine_init(void)
s3c_fb_set_platdata(&aquila_lcd_pdata);
platform_add_devices(aquila_devices, ARRAY_SIZE(aquila_devices));
+
+ if (cma_area_start) {
+ struct cma *cma;
+ cma = cma_create(cma_area_start, cma_area_size);
+ if (cma) {
+ set_dev_cma_area(&s5p_device_fimc0.dev, cma);
+ set_dev_cma_area(&s5p_device_fimc1.dev, cma);
+ set_dev_cma_area(&s5p_device_fimc2.dev, cma);
+ }
+ }
}
MACHINE_START(AQUILA, "Aquila")
@@ -683,4 +708,5 @@ MACHINE_START(AQUILA, "Aquila")
.map_io = aquila_map_io,
.init_machine = aquila_machine_init,
.timer = &s5p_timer,
+ .reserve = aquila_reserve,
MACHINE_END
--
1.7.1.569.g6f426
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