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@samsung.com Signed-off-by: Kyungmin Park kyungmin.park@samsung.com --- 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