[PATCH 1/2] ARM: mx27_3ds: Reserve memory for camera usage

[Sascha Hauer]

On Wed, Oct 10, 2012 at 12:29:29AM -0300, Fabio Estevam wrote:
> From: Fabio Estevam <fabio.estevam at freescale.com>
> 
> Reserve dedicated memory block for camera usage.

Why not use CMA?

Sascha

> 
> Signed-off-by: Fabio Estevam <fabio.estevam at freescale.com>
> ---
>  arch/arm/mach-imx/mach-mx27_3ds.c |   32 +++++++++++++++++++++++++++++++-
>  1 file changed, 31 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/mach-imx/mach-mx27_3ds.c b/arch/arm/mach-imx/mach-mx27_3ds.c
> index 05996f3..d3b9a60 100644
> --- a/arch/arm/mach-imx/mach-mx27_3ds.c
> +++ b/arch/arm/mach-imx/mach-mx27_3ds.c
> @@ -30,6 +30,7 @@
>  #include <linux/spi/spi.h>
>  #include <linux/regulator/machine.h>
>  #include <linux/spi/l4f00242t03.h>
> +#include <asm/memblock.h>
>  
>  #include <media/soc_camera.h>
>  
> @@ -165,6 +166,9 @@ static const int mx27pdk_pins[] __initconst = {
>  	PC19_PF_SSI4_CLK,
>  };
>  
> +static phys_addr_t mx2_camera_base __initdata;
> +#define MX27PDK_CAM_BUF_SIZE	SZ_8M
> +
>  static struct gpio mx27_3ds_camera_gpios[] = {
>  	{ CSI_PWRDWN, GPIOF_OUT_INIT_HIGH, "camera-power" },
>  	{ CSI_RESET, GPIOF_OUT_INIT_HIGH, "camera-reset" },
> @@ -478,6 +482,24 @@ static const struct mx2_camera_platform_data mx27_3ds_cam_pdata __initconst = {
>  	.clk = 26000000,
>  };
>  
> +static void __init mx27pdk_init_camera(void)
> +{
> +	struct platform_device *pdev;
> +	int dma;
> +
> +	pdev = imx27_add_mx2_camera(&mx27_3ds_cam_pdata);
> +
> +	if (IS_ERR(pdev))
> +		return;
> +
> +	dma = dma_declare_coherent_memory(&pdev->dev,
> +				mx2_camera_base, mx2_camera_base,
> +				MX27PDK_CAM_BUF_SIZE,
> +				DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE);
> +	if (!(dma & DMA_MEMORY_MAP))
> +		return;
> +}
> +
>  static const struct imxi2c_platform_data mx27_3ds_i2c0_data __initconst = {
>  	.bitrate = 100000,
>  };
> @@ -527,7 +549,7 @@ static void __init mx27pdk_init(void)
>  		iclink_ov2640.power = NULL;
>  	}
>  
> -	imx27_add_mx2_camera(&mx27_3ds_cam_pdata);
> +	mx27pdk_init_camera();
>  	imx27_add_imx_ssi(0, &mx27_3ds_ssi_pdata);
>  
>  	imx_add_platform_device("imx_mc13783", 0, NULL, 0, NULL, 0);
> @@ -542,6 +564,13 @@ static struct sys_timer mx27pdk_timer = {
>  	.init	= mx27pdk_timer_init,
>  };
>  
> +static void __init mx27pdk_reserve(void)
> +{
> +	/* reserve MX27_3DS_CAMERA_BUF_SIZE bytes for mx2-camera */
> +	mx2_camera_base = arm_memblock_steal(MX27PDK_CAM_BUF_SIZE,
> +						MX27PDK_CAM_BUF_SIZE);
> +}
> +
>  MACHINE_START(MX27_3DS, "Freescale MX27PDK")
>  	/* maintainer: Freescale Semiconductor, Inc. */
>  	.atag_offset = 0x100,
> @@ -551,5 +580,6 @@ MACHINE_START(MX27_3DS, "Freescale MX27PDK")
>  	.handle_irq = imx27_handle_irq,
>  	.timer = &mx27pdk_timer,
>  	.init_machine = mx27pdk_init,
> +	.reserve = mx27pdk_reserve,
>  	.restart	= mxc_restart,
>  MACHINE_END
> -- 
> 1.7.9.5
> 
> 

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