From: gcembed@gmail•com (Gaëtan Carlier)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH 1/2] ARM: mx27_3ds: Reserve memory for camera usage
Date: Wed, 10 Oct 2012 08:51:00 +0200 [thread overview]
Message-ID: <50751AD4.3000002@gmail.com> (raw)
In-Reply-To: <1349839770-13848-1-git-send-email-festevam@gmail.com>
Hi Fabio,
On 10/10/2012 05:29 AM, Fabio Estevam wrote:
> From: Fabio Estevam <fabio.estevam@freescale•com>
>
> Reserve dedicated memory block for camera usage.
Why camera need to have a dedicated memory block reserved in the
platform file ?
>
> Signed-off-by: Fabio Estevam <fabio.estevam@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
>
Thank you.
Best regards,
Ga?tan Carlier.
next prev parent reply other threads:[~2012-10-10 6:51 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-10 3:29 [PATCH 1/2] ARM: mx27_3ds: Reserve memory for camera usage Fabio Estevam
2012-10-10 3:29 ` [PATCH 2/2] ARM: mx27_3ds: Add VPU support Fabio Estevam
2012-10-10 6:51 ` Gaëtan Carlier [this message]
2012-10-10 7:52 ` [PATCH 1/2] ARM: mx27_3ds: Reserve memory for camera usage Sascha Hauer
2012-10-16 4:08 ` Fabio Estevam
2012-10-16 7:13 ` Sascha Hauer
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