On Sun, 4 Jul 2010, Baruch Siach wrote:
> This is the soc_camera support developed by Sascha Hauer for the i.MX27. Alan
> Carvalho de Assis modified the original driver to get it working on more recent
> kernels. I modified it further to add support for i.MX25. This driver has been
> tested on i.MX25 and i.MX27 based platforms.
>
> Signed-off-by: Baruch Siach <baruch@xxxxxxxxxx>
> Acked-by: Guennadi Liakhovetski <g.liakhovetski@xxxxxx>
So, who shall be taking this patch? I'd prefer it go via ARM. Then you can
easier satisfy any dependencies and enforce a certain patch order. It has
my ack, just verified v6 - my ack still holds (I hope, Baruch did
compile-test this new version on various i.MX2x versions). However, if you
prefer, I can also take it via soc-camera / v4l. Sascha, what's your take?
Thanks
Guennadi
> ---
> Changes v5 -> v6
>
> Typo fix: s/CONFIG_MX2_VIDEO/CONFIG_VIDEO_MX2_HOSTSUPPORT/
>
> Changes v4 -> v5
> Comments from Uwe Kleine-König:
>
> Enclose mx27 DMA related stuff in #ifdefs since the dma-mx1-mx2.h is no
> longer accessible to mx25 builds
>
> s/MX2_VIDEO/VIDEO_MX2_HOSTSUPPORT/
>
> Changes v3 -> v4
> Address more comments from Guennadi Liakhovetski, including:
>
> * Fix the double trigger handling of mx27 eMMA
>
> * Add a FIXME comment in the code of eMMA overflow handling
>
> Changes v2 -> v3
> Address more comments from Guennadi Liakhovetski.
>
> Applied part of Sashca's patch that I forgot in v2.
>
> Changes v1 -> v2
> Addressed the comments of Guennadi Liakhovetski except from the following:
>
> 1. The mclk_get_divisor implementation, since I don't know what this code
> is good for
>
> 2. mx2_videobuf_release should not set pcdev->active on i.MX27, because
> mx27_camera_frame_done needs this pointer
>
> 3. In mx27_camera_emma_buf_init I don't know the meaning of those hard
> coded magic numbers
>
> Applied i.MX27 fixes from Sascha.
>
> arch/arm/plat-mxc/include/mach/memory.h | 4 +-
> arch/arm/plat-mxc/include/mach/mx2_cam.h | 46 +
> drivers/media/video/Kconfig | 13 +
> drivers/media/video/Makefile | 1 +
> drivers/media/video/mx2_camera.c | 1513 ++++++++++++++++++++++++++++++
> 5 files changed, 1575 insertions(+), 2 deletions(-)
> create mode 100644 arch/arm/plat-mxc/include/mach/mx2_cam.h
> create mode 100644 drivers/media/video/mx2_camera.c
>
> diff --git a/arch/arm/plat-mxc/include/mach/memory.h b/arch/arm/plat-mxc/include/mach/memory.h
> index c4b40c3..564ec9d 100644
> --- a/arch/arm/plat-mxc/include/mach/memory.h
> +++ b/arch/arm/plat-mxc/include/mach/memory.h
> @@ -44,12 +44,12 @@
> */
> #define CONSISTENT_DMA_SIZE SZ_8M
>
> -#elif defined(CONFIG_MX1_VIDEO)
> +#elif defined(CONFIG_MX1_VIDEO) || defined(CONFIG_VIDEO_MX2_HOSTSUPPORT)
> /*
> * Increase size of DMA-consistent memory region.
> * This is required for i.MX camera driver to capture at least four VGA frames.
> */
> #define CONSISTENT_DMA_SIZE SZ_4M
> -#endif /* CONFIG_MX1_VIDEO */
> +#endif /* CONFIG_MX1_VIDEO || CONFIG_VIDEO_MX2_HOSTSUPPORT */
>
> #endif /* __ASM_ARCH_MXC_MEMORY_H__ */
> diff --git a/arch/arm/plat-mxc/include/mach/mx2_cam.h b/arch/arm/plat-mxc/include/mach/mx2_cam.h
> new file mode 100644
> index 0000000..3c080a3
> --- /dev/null
> +++ b/arch/arm/plat-mxc/include/mach/mx2_cam.h
> @@ -0,0 +1,46 @@
> +/*
> + * mx2-cam.h - i.MX27/i.MX25 camera driver header file
> + *
> + * Copyright (C) 2003, Intel Corporation
> + * Copyright (C) 2008, Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
> + * Copyright (C) 2010, Baruch Siach <baruch@xxxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
> + */
> +
> +#ifndef __MACH_MX2_CAM_H_
> +#define __MACH_MX2_CAM_H_
> +
> +#define MX2_CAMERA_SWAP16 (1 << 0)
> +#define MX2_CAMERA_EXT_VSYNC (1 << 1)
> +#define MX2_CAMERA_CCIR (1 << 2)
> +#define MX2_CAMERA_CCIR_INTERLACE (1 << 3)
> +#define MX2_CAMERA_HSYNC_HIGH (1 << 4)
> +#define MX2_CAMERA_GATED_CLOCK (1 << 5)
> +#define MX2_CAMERA_INV_DATA (1 << 6)
> +#define MX2_CAMERA_PCLK_SAMPLE_RISING (1 << 7)
> +#define MX2_CAMERA_PACK_DIR_MSB (1 << 8)
> +
> +/**
> + * struct mx2_camera_platform_data - optional platform data for mx2_camera
> + * @flags: any combination of MX2_CAMERA_*
> + * @clk: clock rate of the csi block / 2
> + */
> +struct mx2_camera_platform_data {
> + unsigned long flags;
> + unsigned long clk;
> +};
> +
> +#endif /* __MACH_MX2_CAM_H_ */
> diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig
> index bdbc9d3..27e2acc 100644
> --- a/drivers/media/video/Kconfig
> +++ b/drivers/media/video/Kconfig
> @@ -969,6 +969,19 @@ config VIDEO_OMAP2
> ---help---
> This is a v4l2 driver for the TI OMAP2 camera capture interface
>
> +config VIDEO_MX2_HOSTSUPPORT
> + bool
> +
> +config VIDEO_MX2
> + tristate "i.MX27/i.MX25 Camera Sensor Interface driver"
> + depends on VIDEO_DEV && SOC_CAMERA && (MACH_MX27 || ARCH_MX25)
> + select VIDEOBUF_DMA_CONTIG
> + select VIDEO_MX2_HOSTSUPPORT
> + ---help---
> + This is a v4l2 driver for the i.MX27 and the i.MX25 Camera Sensor
> + Interface
> +
> +
> #
> # USB Multimedia device configuration
> #
> diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile
> index cc93859..b08bd2b 100644
> --- a/drivers/media/video/Makefile
> +++ b/drivers/media/video/Makefile
> @@ -162,6 +162,7 @@ obj-$(CONFIG_SOC_CAMERA) += soc_camera.o soc_mediabus.o
> obj-$(CONFIG_SOC_CAMERA_PLATFORM) += soc_camera_platform.o
> # soc-camera host drivers have to be linked after camera drivers
> obj-$(CONFIG_VIDEO_MX1) += mx1_camera.o
> +obj-$(CONFIG_VIDEO_MX2) += mx2_camera.o
> obj-$(CONFIG_VIDEO_MX3) += mx3_camera.o
> obj-$(CONFIG_VIDEO_PXA27x) += pxa_camera.o
> obj-$(CONFIG_VIDEO_SH_MOBILE_CEU) += sh_mobile_ceu_camera.o
> diff --git a/drivers/media/video/mx2_camera.c b/drivers/media/video/mx2_camera.c
> new file mode 100644
> index 0000000..98c93fa
> --- /dev/null
> +++ b/drivers/media/video/mx2_camera.c
> @@ -0,0 +1,1513 @@
> +/*
> + * V4L2 Driver for i.MX27/i.MX25 camera host
> + *
> + * Copyright (C) 2008, Sascha Hauer, Pengutronix
> + * Copyright (C) 2010, Baruch Siach, Orex Computed Radiography
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +
> +#include <linux/init.h>
> +#include <linux/module.h>
> +#include <linux/io.h>
> +#include <linux/delay.h>
> +#include <linux/slab.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/errno.h>
> +#include <linux/fs.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/mm.h>
> +#include <linux/moduleparam.h>
> +#include <linux/time.h>
> +#include <linux/version.h>
> +#include <linux/device.h>
> +#include <linux/platform_device.h>
> +#include <linux/mutex.h>
> +#include <linux/clk.h>
> +
> +#include <media/v4l2-common.h>
> +#include <media/v4l2-dev.h>
> +#include <media/videobuf-dma-contig.h>
> +#include <media/soc_camera.h>
> +#include <media/soc_mediabus.h>
> +
> +#include <linux/videodev2.h>
> +
> +#include <mach/mx2_cam.h>
> +#ifdef CONFIG_MACH_MX27
> +#include <mach/dma-mx1-mx2.h>
> +#endif
> +#include <mach/hardware.h>
> +
> +#include <asm/dma.h>
> +
> +#define MX2_CAM_DRV_NAME "mx2-camera"
> +#define MX2_CAM_VERSION_CODE KERNEL_VERSION(0, 0, 5)
> +#define MX2_CAM_DRIVER_DESCRIPTION "i.MX2x_Camera"
> +
> +/* reset values */
> +#define CSICR1_RESET_VAL 0x40000800
> +#define CSICR2_RESET_VAL 0x0
> +#define CSICR3_RESET_VAL 0x0
> +
> +/* csi control reg 1 */
> +#define CSICR1_SWAP16_EN (1 << 31)
> +#define CSICR1_EXT_VSYNC (1 << 30)
> +#define CSICR1_EOF_INTEN (1 << 29)
> +#define CSICR1_PRP_IF_EN (1 << 28)
> +#define CSICR1_CCIR_MODE (1 << 27)
> +#define CSICR1_COF_INTEN (1 << 26)
> +#define CSICR1_SF_OR_INTEN (1 << 25)
> +#define CSICR1_RF_OR_INTEN (1 << 24)
> +#define CSICR1_STATFF_LEVEL (3 << 22)
> +#define CSICR1_STATFF_INTEN (1 << 21)
> +#define CSICR1_RXFF_LEVEL(l) (((l) & 3) << 19) /* MX27 */
> +#define CSICR1_FB2_DMA_INTEN (1 << 20) /* MX25 */
> +#define CSICR1_FB1_DMA_INTEN (1 << 19) /* MX25 */
> +#define CSICR1_RXFF_INTEN (1 << 18)
> +#define CSICR1_SOF_POL (1 << 17)
> +#define CSICR1_SOF_INTEN (1 << 16)
> +#define CSICR1_MCLKDIV(d) (((d) & 0xF) << 12)
> +#define CSICR1_HSYNC_POL (1 << 11)
> +#define CSICR1_CCIR_EN (1 << 10)
> +#define CSICR1_MCLKEN (1 << 9)
> +#define CSICR1_FCC (1 << 8)
> +#define CSICR1_PACK_DIR (1 << 7)
> +#define CSICR1_CLR_STATFIFO (1 << 6)
> +#define CSICR1_CLR_RXFIFO (1 << 5)
> +#define CSICR1_GCLK_MODE (1 << 4)
> +#define CSICR1_INV_DATA (1 << 3)
> +#define CSICR1_INV_PCLK (1 << 2)
> +#define CSICR1_REDGE (1 << 1)
> +
> +#define SHIFT_STATFF_LEVEL 22
> +#define SHIFT_RXFF_LEVEL 19
> +#define SHIFT_MCLKDIV 12
> +
> +/* control reg 3 */
> +#define CSICR3_FRMCNT (0xFFFF << 16)
> +#define CSICR3_FRMCNT_RST (1 << 15)
> +#define CSICR3_DMA_REFLASH_RFF (1 << 14)
> +#define CSICR3_DMA_REFLASH_SFF (1 << 13)
> +#define CSICR3_DMA_REQ_EN_RFF (1 << 12)
> +#define CSICR3_DMA_REQ_EN_SFF (1 << 11)
> +#define CSICR3_RXFF_LEVEL(l) (((l) & 7) << 4) /* MX25 */
> +#define CSICR3_CSI_SUP (1 << 3)
> +#define CSICR3_ZERO_PACK_EN (1 << 2)
> +#define CSICR3_ECC_INT_EN (1 << 1)
> +#define CSICR3_ECC_AUTO_EN (1 << 0)
> +
> +#define SHIFT_FRMCNT 16
> +
> +/* csi status reg */
> +#define CSISR_SFF_OR_INT (1 << 25)
> +#define CSISR_RFF_OR_INT (1 << 24)
> +#define CSISR_STATFF_INT (1 << 21)
> +#define CSISR_DMA_TSF_FB2_INT (1 << 20) /* MX25 */
> +#define CSISR_DMA_TSF_FB1_INT (1 << 19) /* MX25 */
> +#define CSISR_RXFF_INT (1 << 18)
> +#define CSISR_EOF_INT (1 << 17)
> +#define CSISR_SOF_INT (1 << 16)
> +#define CSISR_F2_INT (1 << 15)
> +#define CSISR_F1_INT (1 << 14)
> +#define CSISR_COF_INT (1 << 13)
> +#define CSISR_ECC_INT (1 << 1)
> +#define CSISR_DRDY (1 << 0)
> +
> +#define CSICR1 0x00
> +#define CSICR2 0x04
> +#define CSISR (cpu_is_mx27() ? 0x08 : 0x18)
> +#define CSISTATFIFO 0x0c
> +#define CSIRFIFO 0x10
> +#define CSIRXCNT 0x14
> +#define CSICR3 (cpu_is_mx27() ? 0x1C : 0x08)
> +#define CSIDMASA_STATFIFO 0x20
> +#define CSIDMATA_STATFIFO 0x24
> +#define CSIDMASA_FB1 0x28
> +#define CSIDMASA_FB2 0x2c
> +#define CSIFBUF_PARA 0x30
> +#define CSIIMAG_PARA 0x34
> +
> +/* EMMA PrP */
> +#define PRP_CNTL 0x00
> +#define PRP_INTR_CNTL 0x04
> +#define PRP_INTRSTATUS 0x08
> +#define PRP_SOURCE_Y_PTR 0x0c
> +#define PRP_SOURCE_CB_PTR 0x10
> +#define PRP_SOURCE_CR_PTR 0x14
> +#define PRP_DEST_RGB1_PTR 0x18
> +#define PRP_DEST_RGB2_PTR 0x1c
> +#define PRP_DEST_Y_PTR 0x20
> +#define PRP_DEST_CB_PTR 0x24
> +#define PRP_DEST_CR_PTR 0x28
> +#define PRP_SRC_FRAME_SIZE 0x2c
> +#define PRP_DEST_CH1_LINE_STRIDE 0x30
> +#define PRP_SRC_PIXEL_FORMAT_CNTL 0x34
> +#define PRP_CH1_PIXEL_FORMAT_CNTL 0x38
> +#define PRP_CH1_OUT_IMAGE_SIZE 0x3c
> +#define PRP_CH2_OUT_IMAGE_SIZE 0x40
> +#define PRP_SRC_LINE_STRIDE 0x44
> +#define PRP_CSC_COEF_012 0x48
> +#define PRP_CSC_COEF_345 0x4c
> +#define PRP_CSC_COEF_678 0x50
> +#define PRP_CH1_RZ_HORI_COEF1 0x54
> +#define PRP_CH1_RZ_HORI_COEF2 0x58
> +#define PRP_CH1_RZ_HORI_VALID 0x5c
> +#define PRP_CH1_RZ_VERT_COEF1 0x60
> +#define PRP_CH1_RZ_VERT_COEF2 0x64
> +#define PRP_CH1_RZ_VERT_VALID 0x68
> +#define PRP_CH2_RZ_HORI_COEF1 0x6c
> +#define PRP_CH2_RZ_HORI_COEF2 0x70
> +#define PRP_CH2_RZ_HORI_VALID 0x74
> +#define PRP_CH2_RZ_VERT_COEF1 0x78
> +#define PRP_CH2_RZ_VERT_COEF2 0x7c
> +#define PRP_CH2_RZ_VERT_VALID 0x80
> +
> +#define PRP_CNTL_CH1EN (1 << 0)
> +#define PRP_CNTL_CH2EN (1 << 1)
> +#define PRP_CNTL_CSIEN (1 << 2)
> +#define PRP_CNTL_DATA_IN_YUV420 (0 << 3)
> +#define PRP_CNTL_DATA_IN_YUV422 (1 << 3)
> +#define PRP_CNTL_DATA_IN_RGB16 (2 << 3)
> +#define PRP_CNTL_DATA_IN_RGB32 (3 << 3)
> +#define PRP_CNTL_CH1_OUT_RGB8 (0 << 5)
> +#define PRP_CNTL_CH1_OUT_RGB16 (1 << 5)
> +#define PRP_CNTL_CH1_OUT_RGB32 (2 << 5)
> +#define PRP_CNTL_CH1_OUT_YUV422 (3 << 5)
> +#define PRP_CNTL_CH2_OUT_YUV420 (0 << 7)
> +#define PRP_CNTL_CH2_OUT_YUV422 (1 << 7)
> +#define PRP_CNTL_CH2_OUT_YUV444 (2 << 7)
> +#define PRP_CNTL_CH1_LEN (1 << 9)
> +#define PRP_CNTL_CH2_LEN (1 << 10)
> +#define PRP_CNTL_SKIP_FRAME (1 << 11)
> +#define PRP_CNTL_SWRST (1 << 12)
> +#define PRP_CNTL_CLKEN (1 << 13)
> +#define PRP_CNTL_WEN (1 << 14)
> +#define PRP_CNTL_CH1BYP (1 << 15)
> +#define PRP_CNTL_IN_TSKIP(x) ((x) << 16)
> +#define PRP_CNTL_CH1_TSKIP(x) ((x) << 19)
> +#define PRP_CNTL_CH2_TSKIP(x) ((x) << 22)
> +#define PRP_CNTL_INPUT_FIFO_LEVEL(x) ((x) << 25)
> +#define PRP_CNTL_RZ_FIFO_LEVEL(x) ((x) << 27)
> +#define PRP_CNTL_CH2B1EN (1 << 29)
> +#define PRP_CNTL_CH2B2EN (1 << 30)
> +#define PRP_CNTL_CH2FEN (1 << 31)
> +
> +/* IRQ Enable and status register */
> +#define PRP_INTR_RDERR (1 << 0)
> +#define PRP_INTR_CH1WERR (1 << 1)
> +#define PRP_INTR_CH2WERR (1 << 2)
> +#define PRP_INTR_CH1FC (1 << 3)
> +#define PRP_INTR_CH2FC (1 << 5)
> +#define PRP_INTR_LBOVF (1 << 7)
> +#define PRP_INTR_CH2OVF (1 << 8)
> +
> +#define mx27_camera_emma(pcdev) (cpu_is_mx27() && pcdev->use_emma)
> +
> +#define MAX_VIDEO_MEM 16
> +
> +struct mx2_camera_dev {
> + struct device *dev;
> + struct soc_camera_host soc_host;
> + struct soc_camera_device *icd;
> + struct clk *clk_csi, *clk_emma;
> +
> + unsigned int irq_csi, irq_emma;
> + void __iomem *base_csi, *base_emma;
> + unsigned long base_dma;
> +
> + struct mx2_camera_platform_data *pdata;
> + struct resource *res_csi, *res_emma;
> + unsigned long platform_flags;
> +
> + struct list_head capture;
> + struct list_head active_bufs;
> +
> + spinlock_t lock;
> +
> + int dma;
> + struct mx2_buffer *active;
> + struct mx2_buffer *fb1_active;
> + struct mx2_buffer *fb2_active;
> +
> + int use_emma;
> +
> + u32 csicr1;
> +
> + void __iomem *discard_buffer;
> + dma_addr_t discard_buffer_dma;
> + size_t discard_size;
> +};
> +
> +/* buffer for one video frame */
> +struct mx2_buffer {
> + /* common v4l buffer stuff -- must be first */
> + struct videobuf_buffer vb;
> +
> + enum v4l2_mbus_pixelcode code;
> +
> + int bufnum;
> +};
> +
> +static void mx2_camera_deactivate(struct mx2_camera_dev *pcdev)
> +{
> + unsigned long flags;
> +
> + clk_disable(pcdev->clk_csi);
> + writel(0, pcdev->base_csi + CSICR1);
> + if (mx27_camera_emma(pcdev)) {
> + writel(0, pcdev->base_emma + PRP_CNTL);
> + } else if (cpu_is_mx25()) {
> + spin_lock_irqsave(&pcdev->lock, flags);
> + pcdev->fb1_active = NULL;
> + pcdev->fb2_active = NULL;
> + writel(0, pcdev->base_csi + CSIDMASA_FB1);
> + writel(0, pcdev->base_csi + CSIDMASA_FB2);
> + spin_unlock_irqrestore(&pcdev->lock, flags);
> + }
> +}
> +
> +/*
> + * The following two functions absolutely depend on the fact, that
> + * there can be only one camera on mx2 camera sensor interface
> + */
> +static int mx2_camera_add_device(struct soc_camera_device *icd)
> +{
> + struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
> + struct mx2_camera_dev *pcdev = ici->priv;
> + int ret;
> + u32 csicr1;
> +
> + if (pcdev->icd)
> + return -EBUSY;
> +
> + ret = clk_enable(pcdev->clk_csi);
> + if (ret < 0)
> + return ret;
> +
> + csicr1 = CSICR1_MCLKEN;
> +
> + if (mx27_camera_emma(pcdev)) {
> + csicr1 |= CSICR1_PRP_IF_EN | CSICR1_FCC |
> + CSICR1_RXFF_LEVEL(0);
> + } else if (cpu_is_mx27())
> + csicr1 |= CSICR1_SOF_INTEN | CSICR1_RXFF_LEVEL(2);
> +
> + pcdev->csicr1 = csicr1;
> + writel(pcdev->csicr1, pcdev->base_csi + CSICR1);
> +
> + pcdev->icd = icd;
> +
> + dev_info(icd->dev.parent, "Camera driver attached to camera %d\n",
> + icd->devnum);
> +
> + return 0;
> +}
> +
> +static void mx2_camera_remove_device(struct soc_camera_device *icd)
> +{
> + struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
> + struct mx2_camera_dev *pcdev = ici->priv;
> +
> + BUG_ON(icd != pcdev->icd);
> +
> + dev_info(icd->dev.parent, "Camera driver detached from camera %d\n",
> + icd->devnum);
> +
> + mx2_camera_deactivate(pcdev);
> +
> + if (pcdev->discard_buffer) {
> + dma_free_coherent(ici->v4l2_dev.dev, pcdev->discard_size,
> + pcdev->discard_buffer,
> + pcdev->discard_buffer_dma);
> + pcdev->discard_buffer = NULL;
> + }
> +
> + pcdev->icd = NULL;
> +}
> +
> +#ifdef CONFIG_MACH_MX27
> +static void mx27_camera_dma_enable(struct mx2_camera_dev *pcdev)
> +{
> + u32 tmp;
> +
> + imx_dma_enable(pcdev->dma);
> +
> + tmp = readl(pcdev->base_csi + CSICR1);
> + tmp |= CSICR1_RF_OR_INTEN;
> + writel(tmp, pcdev->base_csi + CSICR1);
> +}
> +
> +static irqreturn_t mx27_camera_irq(int irq_csi, void *data)
> +{
> + struct mx2_camera_dev *pcdev = data;
> + u32 status = readl(pcdev->base_csi + CSISR);
> +
> + if (status & CSISR_SOF_INT && pcdev->active) {
> + u32 tmp;
> +
> + tmp = readl(pcdev->base_csi + CSICR1);
> + writel(tmp | CSICR1_CLR_RXFIFO, pcdev->base_csi + CSICR1);
> + mx27_camera_dma_enable(pcdev);
> + }
> +
> + writel(CSISR_SOF_INT | CSISR_RFF_OR_INT, pcdev->base_csi + CSISR);
> +
> + return IRQ_HANDLED;
> +}
> +#else
> +static irqreturn_t mx27_camera_irq(int irq_csi, void *data)
> +{
> + return IRQ_NONE;
> +}
> +#endif /* CONFIG_MACH_MX27 */
> +
> +static void mx25_camera_frame_done(struct mx2_camera_dev *pcdev, int fb,
> + int state)
> +{
> + struct videobuf_buffer *vb;
> + struct mx2_buffer *buf;
> + struct mx2_buffer **fb_active = fb == 1 ? &pcdev->fb1_active :
> + &pcdev->fb2_active;
> + u32 fb_reg = fb == 1 ? CSIDMASA_FB1 : CSIDMASA_FB2;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&pcdev->lock, flags);
> +
> + vb = &(*fb_active)->vb;
> + dev_dbg(pcdev->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
> + vb, vb->baddr, vb->bsize);
> +
> + vb->state = state;
> + do_gettimeofday(&vb->ts);
> + vb->field_count++;
> +
> + wake_up(&vb->done);
> +
> + if (list_empty(&pcdev->capture)) {
> + buf = NULL;
> + writel(0, pcdev->base_csi + fb_reg);
> + } else {
> + buf = list_entry(pcdev->capture.next, struct mx2_buffer,
> + vb.queue);
> + vb = &buf->vb;
> + list_del(&vb->queue);
> + vb->state = VIDEOBUF_ACTIVE;
> + writel(videobuf_to_dma_contig(vb), pcdev->base_csi + fb_reg);
> + }
> +
> + *fb_active = buf;
> +
> + spin_unlock_irqrestore(&pcdev->lock, flags);
> +}
> +
> +static irqreturn_t mx25_camera_irq(int irq_csi, void *data)
> +{
> + struct mx2_camera_dev *pcdev = data;
> + u32 status = readl(pcdev->base_csi + CSISR);
> +
> + if (status & CSISR_DMA_TSF_FB1_INT)
> + mx25_camera_frame_done(pcdev, 1, VIDEOBUF_DONE);
> + else if (status & CSISR_DMA_TSF_FB2_INT)
> + mx25_camera_frame_done(pcdev, 2, VIDEOBUF_DONE);
> +
> + /* FIXME: handle CSISR_RFF_OR_INT */
> +
> + writel(status, pcdev->base_csi + CSISR);
> +
> + return IRQ_HANDLED;
> +}
> +
> +/*
> + * Videobuf operations
> + */
> +static int mx2_videobuf_setup(struct videobuf_queue *vq, unsigned int *count,
> + unsigned int *size)
> +{
> + struct soc_camera_device *icd = vq->priv_data;
> + int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
> + icd->current_fmt->host_fmt);
> +
> + dev_dbg(&icd->dev, "count=%d, size=%d\n", *count, *size);
> +
> + if (bytes_per_line < 0)
> + return bytes_per_line;
> +
> + *size = bytes_per_line * icd->user_height;
> +
> + if (0 == *count)
> + *count = 32;
> + if (*size * *count > MAX_VIDEO_MEM * 1024 * 1024)
> + *count = (MAX_VIDEO_MEM * 1024 * 1024) / *size;
> +
> + return 0;
> +}
> +
> +static void free_buffer(struct videobuf_queue *vq, struct mx2_buffer *buf)
> +{
> + struct soc_camera_device *icd = vq->priv_data;
> + struct videobuf_buffer *vb = &buf->vb;
> +
> + dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
> + vb, vb->baddr, vb->bsize);
> +
> + /*
> + * This waits until this buffer is out of danger, i.e., until it is no
> + * longer in STATE_QUEUED or STATE_ACTIVE
> + */
> + videobuf_waiton(vb, 0, 0);
> +
> + videobuf_dma_contig_free(vq, vb);
> + dev_dbg(&icd->dev, "%s freed\n", __func__);
> +
> + vb->state = VIDEOBUF_NEEDS_INIT;
> +}
> +
> +static int mx2_videobuf_prepare(struct videobuf_queue *vq,
> + struct videobuf_buffer *vb, enum v4l2_field field)
> +{
> + struct soc_camera_device *icd = vq->priv_data;
> + struct mx2_buffer *buf = container_of(vb, struct mx2_buffer, vb);
> + int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
> + icd->current_fmt->host_fmt);
> + int ret = 0;
> +
> + dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
> + vb, vb->baddr, vb->bsize);
> +
> + if (bytes_per_line < 0)
> + return bytes_per_line;
> +
> +#ifdef DEBUG
> + /*
> + * This can be useful if you want to see if we actually fill
> + * the buffer with something
> + */
> + memset((void *)vb->baddr, 0xaa, vb->bsize);
> +#endif
> +
> + if (buf->code != icd->current_fmt->code ||
> + vb->width != icd->user_width ||
> + vb->height != icd->user_height ||
> + vb->field != field) {
> + buf->code = icd->current_fmt->code;
> + vb->width = icd->user_width;
> + vb->height = icd->user_height;
> + vb->field = field;
> + vb->state = VIDEOBUF_NEEDS_INIT;
> + }
> +
> + vb->size = bytes_per_line * vb->height;
> + if (vb->baddr && vb->bsize < vb->size) {
> + ret = -EINVAL;
> + goto out;
> + }
> +
> + if (vb->state == VIDEOBUF_NEEDS_INIT) {
> + ret = videobuf_iolock(vq, vb, NULL);
> + if (ret)
> + goto fail;
> +
> + vb->state = VIDEOBUF_PREPARED;
> + }
> +
> + return 0;
> +
> +fail:
> + free_buffer(vq, buf);
> +out:
> + return ret;
> +}
> +
> +static void mx2_videobuf_queue(struct videobuf_queue *vq,
> + struct videobuf_buffer *vb)
> +{
> + struct soc_camera_device *icd = vq->priv_data;
> + struct soc_camera_host *ici =
> + to_soc_camera_host(icd->dev.parent);
> + struct mx2_camera_dev *pcdev = ici->priv;
> + struct mx2_buffer *buf = container_of(vb, struct mx2_buffer, vb);
> + unsigned long flags;
> +
> + dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
> + vb, vb->baddr, vb->bsize);
> +
> + spin_lock_irqsave(&pcdev->lock, flags);
> +
> + vb->state = VIDEOBUF_QUEUED;
> + list_add_tail(&vb->queue, &pcdev->capture);
> +
> + if (mx27_camera_emma(pcdev)) {
> + goto out;
> +#ifdef CONFIG_MACH_MX27
> + } else if (cpu_is_mx27()) {
> + int ret;
> +
> + if (pcdev->active == NULL) {
> + ret = imx_dma_setup_single(pcdev->dma,
> + videobuf_to_dma_contig(vb), vb->size,
> + (u32)pcdev->base_dma + 0x10,
> + DMA_MODE_READ);
> + if (ret) {
> + vb->state = VIDEOBUF_ERROR;
> + wake_up(&vb->done);
> + goto out;
> + }
> +
> + vb->state = VIDEOBUF_ACTIVE;
> + pcdev->active = buf;
> + }
> +#endif
> + } else { /* cpu_is_mx25() */
> + u32 csicr3, dma_inten = 0;
> +
> + if (pcdev->fb1_active == NULL) {
> + writel(videobuf_to_dma_contig(vb),
> + pcdev->base_csi + CSIDMASA_FB1);
> + pcdev->fb1_active = buf;
> + dma_inten = CSICR1_FB1_DMA_INTEN;
> + } else if (pcdev->fb2_active == NULL) {
> + writel(videobuf_to_dma_contig(vb),
> + pcdev->base_csi + CSIDMASA_FB2);
> + pcdev->fb2_active = buf;
> + dma_inten = CSICR1_FB2_DMA_INTEN;
> + }
> +
> + if (dma_inten) {
> + list_del(&vb->queue);
> + vb->state = VIDEOBUF_ACTIVE;
> +
> + csicr3 = readl(pcdev->base_csi + CSICR3);
> +
> + /* Reflash DMA */
> + writel(csicr3 | CSICR3_DMA_REFLASH_RFF,
> + pcdev->base_csi + CSICR3);
> +
> + /* clear & enable interrupts */
> + writel(dma_inten, pcdev->base_csi + CSISR);
> + pcdev->csicr1 |= dma_inten;
> + writel(pcdev->csicr1, pcdev->base_csi + CSICR1);
> +
> + /* enable DMA */
> + csicr3 |= CSICR3_DMA_REQ_EN_RFF | CSICR3_RXFF_LEVEL(1);
> + writel(csicr3, pcdev->base_csi + CSICR3);
> + }
> + }
> +
> +out:
> + spin_unlock_irqrestore(&pcdev->lock, flags);
> +}
> +
> +static void mx2_videobuf_release(struct videobuf_queue *vq,
> + struct videobuf_buffer *vb)
> +{
> + struct soc_camera_device *icd = vq->priv_data;
> + struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
> + struct mx2_camera_dev *pcdev = ici->priv;
> + struct mx2_buffer *buf = container_of(vb, struct mx2_buffer, vb);
> + unsigned long flags;
> +
> +#ifdef DEBUG
> + dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
> + vb, vb->baddr, vb->bsize);
> +
> + switch (vb->state) {
> + case VIDEOBUF_ACTIVE:
> + dev_info(&icd->dev, "%s (active)\n", __func__);
> + break;
> + case VIDEOBUF_QUEUED:
> + dev_info(&icd->dev, "%s (queued)\n", __func__);
> + break;
> + case VIDEOBUF_PREPARED:
> + dev_info(&icd->dev, "%s (prepared)\n", __func__);
> + break;
> + default:
> + dev_info(&icd->dev, "%s (unknown) %d\n", __func__,
> + vb->state);
> + break;
> + }
> +#endif
> +
> + /*
> + * Terminate only queued but inactive buffers. Active buffers are
> + * released when they become inactive after videobuf_waiton().
> + *
> + * FIXME: implement forced termination of active buffers, so that the
> + * user won't get stuck in an uninterruptible state. This requires a
> + * specific handling for each of the three DMA types that this driver
> + * supports.
> + */
> + spin_lock_irqsave(&pcdev->lock, flags);
> + if (vb->state == VIDEOBUF_QUEUED) {
> + list_del(&vb->queue);
> + vb->state = VIDEOBUF_ERROR;
> + }
> + spin_unlock_irqrestore(&pcdev->lock, flags);
> +
> + free_buffer(vq, buf);
> +}
> +
> +static struct videobuf_queue_ops mx2_videobuf_ops = {
> + .buf_setup = mx2_videobuf_setup,
> + .buf_prepare = mx2_videobuf_prepare,
> + .buf_queue = mx2_videobuf_queue,
> + .buf_release = mx2_videobuf_release,
> +};
> +
> +static void mx2_camera_init_videobuf(struct videobuf_queue *q,
> + struct soc_camera_device *icd)
> +{
> + struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
> + struct mx2_camera_dev *pcdev = ici->priv;
> +
> + videobuf_queue_dma_contig_init(q, &mx2_videobuf_ops, pcdev->dev,
> + &pcdev->lock, V4L2_BUF_TYPE_VIDEO_CAPTURE,
> + V4L2_FIELD_NONE, sizeof(struct mx2_buffer), icd);
> +}
> +
> +#define MX2_BUS_FLAGS (SOCAM_DATAWIDTH_8 | \
> + SOCAM_MASTER | \
> + SOCAM_VSYNC_ACTIVE_HIGH | \
> + SOCAM_VSYNC_ACTIVE_LOW | \
> + SOCAM_HSYNC_ACTIVE_HIGH | \
> + SOCAM_HSYNC_ACTIVE_LOW | \
> + SOCAM_PCLK_SAMPLE_RISING | \
> + SOCAM_PCLK_SAMPLE_FALLING | \
> + SOCAM_DATA_ACTIVE_HIGH | \
> + SOCAM_DATA_ACTIVE_LOW)
> +
> +static int mx27_camera_emma_prp_reset(struct mx2_camera_dev *pcdev)
> +{
> + u32 cntl;
> + int count = 0;
> +
> + cntl = readl(pcdev->base_emma + PRP_CNTL);
> + writel(PRP_CNTL_SWRST, pcdev->base_emma + PRP_CNTL);
> + while (count++ < 100) {
> + if (!(readl(pcdev->base_emma + PRP_CNTL) & PRP_CNTL_SWRST))
> + return 0;
> + barrier();
> + udelay(1);
> + }
> +
> + return -ETIMEDOUT;
> +}
> +
> +static void mx27_camera_emma_buf_init(struct soc_camera_device *icd,
> + int bytesperline)
> +{
> + struct soc_camera_host *ici =
> + to_soc_camera_host(icd->dev.parent);
> + struct mx2_camera_dev *pcdev = ici->priv;
> +
> + writel(pcdev->discard_buffer_dma,
> + pcdev->base_emma + PRP_DEST_RGB1_PTR);
> + writel(pcdev->discard_buffer_dma,
> + pcdev->base_emma + PRP_DEST_RGB2_PTR);
> +
> + /*
> + * We only use the EMMA engine to get rid of the broken
> + * DMA Engine. No color space consversion at the moment.
> + * We adjust incoming and outgoing pixelformat to rgb16
> + * and adjust the bytesperline accordingly.
> + */
> + writel(PRP_CNTL_CH1EN |
> + PRP_CNTL_CSIEN |
> + PRP_CNTL_DATA_IN_RGB16 |
> + PRP_CNTL_CH1_OUT_RGB16 |
> + PRP_CNTL_CH1_LEN |
> + PRP_CNTL_CH1BYP |
> + PRP_CNTL_CH1_TSKIP(0) |
> + PRP_CNTL_IN_TSKIP(0),
> + pcdev->base_emma + PRP_CNTL);
> +
> + writel(((bytesperline >> 1) << 16) | icd->user_height,
> + pcdev->base_emma + PRP_SRC_FRAME_SIZE);
> + writel(((bytesperline >> 1) << 16) | icd->user_height,
> + pcdev->base_emma + PRP_CH1_OUT_IMAGE_SIZE);
> + writel(bytesperline,
> + pcdev->base_emma + PRP_DEST_CH1_LINE_STRIDE);
> + writel(0x2ca00565, /* RGB565 */
> + pcdev->base_emma + PRP_SRC_PIXEL_FORMAT_CNTL);
> + writel(0x2ca00565, /* RGB565 */
> + pcdev->base_emma + PRP_CH1_PIXEL_FORMAT_CNTL);
> +
> + /* Enable interrupts */
> + writel(PRP_INTR_RDERR |
> + PRP_INTR_CH1WERR |
> + PRP_INTR_CH2WERR |
> + PRP_INTR_CH1FC |
> + PRP_INTR_CH2FC |
> + PRP_INTR_LBOVF |
> + PRP_INTR_CH2OVF,
> + pcdev->base_emma + PRP_INTR_CNTL);
> +}
> +
> +static int mx2_camera_set_bus_param(struct soc_camera_device *icd,
> + __u32 pixfmt)
> +{
> + struct soc_camera_host *ici =
> + to_soc_camera_host(icd->dev.parent);
> + struct mx2_camera_dev *pcdev = ici->priv;
> + unsigned long camera_flags, common_flags;
> + int ret = 0;
> + int bytesperline;
> + u32 csicr1 = pcdev->csicr1;
> +
> + camera_flags = icd->ops->query_bus_param(icd);
> +
> + common_flags = soc_camera_bus_param_compatible(camera_flags,
> + MX2_BUS_FLAGS);
> + if (!common_flags)
> + return -EINVAL;
> +
> + if ((common_flags & SOCAM_HSYNC_ACTIVE_HIGH) &&
> + (common_flags & SOCAM_HSYNC_ACTIVE_LOW)) {
> + if (pcdev->platform_flags & MX2_CAMERA_HSYNC_HIGH)
> + common_flags &= ~SOCAM_HSYNC_ACTIVE_LOW;
> + else
> + common_flags &= ~SOCAM_HSYNC_ACTIVE_HIGH;
> + }
> +
> + if ((common_flags & SOCAM_PCLK_SAMPLE_RISING) &&
> + (common_flags & SOCAM_PCLK_SAMPLE_FALLING)) {
> + if (pcdev->platform_flags & MX2_CAMERA_PCLK_SAMPLE_RISING)
> + common_flags &= ~SOCAM_PCLK_SAMPLE_FALLING;
> + else
> + common_flags &= ~SOCAM_PCLK_SAMPLE_RISING;
> + }
> +
> + ret = icd->ops->set_bus_param(icd, common_flags);
> + if (ret < 0)
> + return ret;
> +
> + if (common_flags & SOCAM_PCLK_SAMPLE_FALLING)
> + csicr1 |= CSICR1_INV_PCLK;
> + if (common_flags & SOCAM_VSYNC_ACTIVE_HIGH)
> + csicr1 |= CSICR1_SOF_POL;
> + if (common_flags & SOCAM_HSYNC_ACTIVE_HIGH)
> + csicr1 |= CSICR1_HSYNC_POL;
> + if (pcdev->platform_flags & MX2_CAMERA_SWAP16)
> + csicr1 |= CSICR1_SWAP16_EN;
> + if (pcdev->platform_flags & MX2_CAMERA_EXT_VSYNC)
> + csicr1 |= CSICR1_EXT_VSYNC;
> + if (pcdev->platform_flags & MX2_CAMERA_CCIR)
> + csicr1 |= CSICR1_CCIR_EN;
> + if (pcdev->platform_flags & MX2_CAMERA_CCIR_INTERLACE)
> + csicr1 |= CSICR1_CCIR_MODE;
> + if (pcdev->platform_flags & MX2_CAMERA_GATED_CLOCK)
> + csicr1 |= CSICR1_GCLK_MODE;
> + if (pcdev->platform_flags & MX2_CAMERA_INV_DATA)
> + csicr1 |= CSICR1_INV_DATA;
> + if (pcdev->platform_flags & MX2_CAMERA_PACK_DIR_MSB)
> + csicr1 |= CSICR1_PACK_DIR;
> +
> + pcdev->csicr1 = csicr1;
> +
> + bytesperline = soc_mbus_bytes_per_line(icd->user_width,
> + icd->current_fmt->host_fmt);
> + if (bytesperline < 0)
> + return bytesperline;
> +
> + if (mx27_camera_emma(pcdev)) {
> + ret = mx27_camera_emma_prp_reset(pcdev);
> + if (ret)
> + return ret;
> +
> + if (pcdev->discard_buffer)
> + dma_free_coherent(ici->v4l2_dev.dev,
> + pcdev->discard_size, pcdev->discard_buffer,
> + pcdev->discard_buffer_dma);
> +
> + /*
> + * I didn't manage to properly enable/disable the prp
> + * on a per frame basis during running transfers,
> + * thus we allocate a buffer here and use it to
> + * discard frames when no buffer is available.
> + * Feel free to work on this ;)
> + */
> + pcdev->discard_size = icd->user_height * bytesperline;
> + pcdev->discard_buffer = dma_alloc_coherent(ici->v4l2_dev.dev,
> + pcdev->discard_size, &pcdev->discard_buffer_dma,
> + GFP_KERNEL);
> + if (!pcdev->discard_buffer)
> + return -ENOMEM;
> +
> + mx27_camera_emma_buf_init(icd, bytesperline);
> + } else if (cpu_is_mx25()) {
> + writel((bytesperline * icd->user_height) >> 2,
> + pcdev->base_csi + CSIRXCNT);
> + writel((bytesperline << 16) | icd->user_height,
> + pcdev->base_csi + CSIIMAG_PARA);
> + }
> +
> + writel(pcdev->csicr1, pcdev->base_csi + CSICR1);
> +
> + return 0;
> +}
> +
> +static int mx2_camera_set_crop(struct soc_camera_device *icd,
> + struct v4l2_crop *a)
> +{
> + struct v4l2_rect *rect = &a->c;
> + struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
> + struct v4l2_mbus_framefmt mf;
> + int ret;
> +
> + soc_camera_limit_side(&rect->left, &rect->width, 0, 2, 4096);
> + soc_camera_limit_side(&rect->top, &rect->height, 0, 2, 4096);
> +
> + ret = v4l2_subdev_call(sd, video, s_crop, a);
> + if (ret < 0)
> + return ret;
> +
> + /* The capture device might have changed its output */
> + ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
> + if (ret < 0)
> + return ret;
> +
> + dev_dbg(icd->dev.parent, "Sensor cropped %dx%d\n",
> + mf.width, mf.height);
> +
> + icd->user_width = mf.width;
> + icd->user_height = mf.height;
> +
> + return ret;
> +}
> +
> +static int mx2_camera_set_fmt(struct soc_camera_device *icd,
> + struct v4l2_format *f)
> +{
> + struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
> + struct mx2_camera_dev *pcdev = ici->priv;
> + struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
> + const struct soc_camera_format_xlate *xlate;
> + struct v4l2_pix_format *pix = &f->fmt.pix;
> + struct v4l2_mbus_framefmt mf;
> + int ret;
> +
> + xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
> + if (!xlate) {
> + dev_warn(icd->dev.parent, "Format %x not found\n",
> + pix->pixelformat);
> + return -EINVAL;
> + }
> +
> + /* eMMA can only do RGB565 */
> + if (mx27_camera_emma(pcdev) && pix->pixelformat != V4L2_PIX_FMT_RGB565)
> + return -EINVAL;
> +
> + mf.width = pix->width;
> + mf.height = pix->height;
> + mf.field = pix->field;
> + mf.colorspace = pix->colorspace;
> + mf.code = xlate->code;
> +
> + ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf);
> + if (ret < 0 && ret != -ENOIOCTLCMD)
> + return ret;
> +
> + if (mf.code != xlate->code)
> + return -EINVAL;
> +
> + pix->width = mf.width;
> + pix->height = mf.height;
> + pix->field = mf.field;
> + pix->colorspace = mf.colorspace;
> + icd->current_fmt = xlate;
> +
> + return 0;
> +}
> +
> +static int mx2_camera_try_fmt(struct soc_camera_device *icd,
> + struct v4l2_format *f)
> +{
> + struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
> + struct mx2_camera_dev *pcdev = ici->priv;
> + struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
> + const struct soc_camera_format_xlate *xlate;
> + struct v4l2_pix_format *pix = &f->fmt.pix;
> + struct v4l2_mbus_framefmt mf;
> + __u32 pixfmt = pix->pixelformat;
> + unsigned int width_limit;
> + int ret;
> +
> + xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
> + if (pixfmt && !xlate) {
> + dev_warn(icd->dev.parent, "Format %x not found\n", pixfmt);
> + return -EINVAL;
> + }
> +
> + /* FIXME: implement MX27 limits */
> +
> + /* eMMA can only do RGB565 */
> + if (mx27_camera_emma(pcdev) && pixfmt != V4L2_PIX_FMT_RGB565)
> + return -EINVAL;
> +
> + /* limit to MX25 hardware capabilities */
> + if (cpu_is_mx25()) {
> + if (xlate->host_fmt->bits_per_sample <= 8)
> + width_limit = 0xffff * 4;
> + else
> + width_limit = 0xffff * 2;
> + /* CSIIMAG_PARA limit */
> + if (pix->width > width_limit)
> + pix->width = width_limit;
> + if (pix->height > 0xffff)
> + pix->height = 0xffff;
> +
> + pix->bytesperline = soc_mbus_bytes_per_line(pix->width,
> + xlate->host_fmt);
> + if (pix->bytesperline < 0)
> + return pix->bytesperline;
> + pix->sizeimage = pix->height * pix->bytesperline;
> + if (pix->sizeimage > (4 * 0x3ffff)) { /* CSIRXCNT limit */
> + dev_warn(icd->dev.parent,
> + "Image size (%u) above limit\n",
> + pix->sizeimage);
> + return -EINVAL;
> + }
> + }
> +
> + /* limit to sensor capabilities */
> + mf.width = pix->width;
> + mf.height = pix->height;
> + mf.field = pix->field;
> + mf.colorspace = pix->colorspace;
> + mf.code = xlate->code;
> +
> + ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
> + if (ret < 0)
> + return ret;
> +
> + if (mf.field == V4L2_FIELD_ANY)
> + mf.field = V4L2_FIELD_NONE;
> + if (mf.field != V4L2_FIELD_NONE) {
> + dev_err(icd->dev.parent, "Field type %d unsupported.\n",
> + mf.field);
> + return -EINVAL;
> + }
> +
> + pix->width = mf.width;
> + pix->height = mf.height;
> + pix->field = mf.field;
> + pix->colorspace = mf.colorspace;
> +
> + return 0;
> +}
> +
> +static int mx2_camera_querycap(struct soc_camera_host *ici,
> + struct v4l2_capability *cap)
> +{
> + /* cap->name is set by the friendly caller:-> */
> + strlcpy(cap->card, MX2_CAM_DRIVER_DESCRIPTION, sizeof(cap->card));
> + cap->version = MX2_CAM_VERSION_CODE;
> + cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
> +
> + return 0;
> +}
> +
> +static int mx2_camera_reqbufs(struct soc_camera_file *icf,
> + struct v4l2_requestbuffers *p)
> +{
> + int i;
> +
> + for (i = 0; i < p->count; i++) {
> + struct mx2_buffer *buf = container_of(icf->vb_vidq.bufs[i],
> + struct mx2_buffer, vb);
> + INIT_LIST_HEAD(&buf->vb.queue);
> + }
> +
> + return 0;
> +}
> +
> +#ifdef CONFIG_MACH_MX27
> +static void mx27_camera_frame_done(struct mx2_camera_dev *pcdev, int state)
> +{
> + struct videobuf_buffer *vb;
> + struct mx2_buffer *buf;
> + unsigned long flags;
> + int ret;
> +
> + spin_lock_irqsave(&pcdev->lock, flags);
> +
> + if (!pcdev->active) {
> + dev_err(pcdev->dev, "%s called with no active buffer!\n",
> + __func__);
> + goto out;
> + }
> +
> + vb = &pcdev->active->vb;
> + buf = container_of(vb, struct mx2_buffer, vb);
> + WARN_ON(list_empty(&vb->queue));
> + dev_dbg(pcdev->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
> + vb, vb->baddr, vb->bsize);
> +
> + /* _init is used to debug races, see comment in pxa_camera_reqbufs() */
> + list_del_init(&vb->queue);
> + vb->state = state;
> + do_gettimeofday(&vb->ts);
> + vb->field_count++;
> +
> + wake_up(&vb->done);
> +
> + if (list_empty(&pcdev->capture)) {
> + pcdev->active = NULL;
> + goto out;
> + }
> +
> + pcdev->active = list_entry(pcdev->capture.next,
> + struct mx2_buffer, vb.queue);
> +
> + vb = &pcdev->active->vb;
> + vb->state = VIDEOBUF_ACTIVE;
> +
> + ret = imx_dma_setup_single(pcdev->dma, videobuf_to_dma_contig(vb),
> + vb->size, (u32)pcdev->base_dma + 0x10, DMA_MODE_READ);
> +
> + if (ret) {
> + vb->state = VIDEOBUF_ERROR;
> + pcdev->active = NULL;
> + wake_up(&vb->done);
> + }
> +
> +out:
> + spin_unlock_irqrestore(&pcdev->lock, flags);
> +}
> +
> +static void mx27_camera_dma_err_callback(int channel, void *data, int err)
> +{
> + struct mx2_camera_dev *pcdev = data;
> +
> + mx27_camera_frame_done(pcdev, VIDEOBUF_ERROR);
> +}
> +
> +static void mx27_camera_dma_callback(int channel, void *data)
> +{
> + struct mx2_camera_dev *pcdev = data;
> +
> + mx27_camera_frame_done(pcdev, VIDEOBUF_DONE);
> +}
> +
> +#define DMA_REQ_CSI_RX 31 /* FIXME: Add this to a resource */
> +
> +static int __devinit mx27_camera_dma_init(struct platform_device *pdev,
> + struct mx2_camera_dev *pcdev)
> +{
> + int err;
> +
> + pcdev->dma = imx_dma_request_by_prio("CSI RX DMA", DMA_PRIO_HIGH);
> + if (pcdev->dma < 0) {
> + dev_err(&pdev->dev, "%s failed to request DMA channel\n",
> + __func__);
> + return pcdev->dma;
> + }
> +
> + err = imx_dma_setup_handlers(pcdev->dma, mx27_camera_dma_callback,
> + mx27_camera_dma_err_callback, pcdev);
> + if (err) {
> + dev_err(&pdev->dev, "%s failed to set DMA callback\n",
> + __func__);
> + goto err_out;
> + }
> +
> + err = imx_dma_config_channel(pcdev->dma,
> + IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_FIFO,
> + IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR,
> + DMA_REQ_CSI_RX, 1);
> + if (err) {
> + dev_err(&pdev->dev, "%s failed to config DMA channel\n",
> + __func__);
> + goto err_out;
> + }
> +
> + imx_dma_config_burstlen(pcdev->dma, 64);
> +
> + return 0;
> +
> +err_out:
> + imx_dma_free(pcdev->dma);
> +
> + return err;
> +}
> +#endif /* CONFIG_MACH_MX27 */
> +
> +static unsigned int mx2_camera_poll(struct file *file, poll_table *pt)
> +{
> + struct soc_camera_file *icf = file->private_data;
> +
> + return videobuf_poll_stream(file, &icf->vb_vidq, pt);
> +}
> +
> +static struct soc_camera_host_ops mx2_soc_camera_host_ops = {
> + .owner = THIS_MODULE,
> + .add = mx2_camera_add_device,
> + .remove = mx2_camera_remove_device,
> + .set_fmt = mx2_camera_set_fmt,
> + .set_crop = mx2_camera_set_crop,
> + .try_fmt = mx2_camera_try_fmt,
> + .init_videobuf = mx2_camera_init_videobuf,
> + .reqbufs = mx2_camera_reqbufs,
> + .poll = mx2_camera_poll,
> + .querycap = mx2_camera_querycap,
> + .set_bus_param = mx2_camera_set_bus_param,
> +};
> +
> +static void mx27_camera_frame_done_emma(struct mx2_camera_dev *pcdev,
> + int bufnum, int state)
> +{
> + struct mx2_buffer *buf;
> + struct videobuf_buffer *vb;
> + unsigned long phys;
> +
> + if (!list_empty(&pcdev->active_bufs)) {
> + buf = list_entry(pcdev->active_bufs.next,
> + struct mx2_buffer, vb.queue);
> +
> + BUG_ON(buf->bufnum != bufnum);
> +
> + vb = &buf->vb;
> +#ifdef DEBUG
> + phys = videobuf_to_dma_contig(vb);
> + if (readl(pcdev->base_emma + PRP_DEST_RGB1_PTR + 4 * bufnum)
> + != phys) {
> + dev_err(pcdev->dev, "%p != %p\n", phys,
> + readl(pcdev->base_emma +
> + PRP_DEST_RGB1_PTR +
> + 4 * bufnum));
> + }
> +#endif
> + dev_dbg(pcdev->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__, vb,
> + vb->baddr, vb->bsize);
> +
> + list_del(&vb->queue);
> + vb->state = state;
> + do_gettimeofday(&vb->ts);
> + vb->field_count++;
> +
> + wake_up(&vb->done);
> + }
> +
> + if (list_empty(&pcdev->capture)) {
> + writel(pcdev->discard_buffer_dma, pcdev->base_emma +
> + PRP_DEST_RGB1_PTR + 4 * bufnum);
> + return;
> + }
> +
> + buf = list_entry(pcdev->capture.next,
> + struct mx2_buffer, vb.queue);
> +
> + buf->bufnum = bufnum;
> +
> + list_move_tail(pcdev->capture.next, &pcdev->active_bufs);
> +
> + vb = &buf->vb;
> + vb->state = VIDEOBUF_ACTIVE;
> +
> + phys = videobuf_to_dma_contig(vb);
> + writel(phys, pcdev->base_emma + PRP_DEST_RGB1_PTR + 4 * bufnum);
> +}
> +
> +static irqreturn_t mx27_camera_emma_irq(int irq_emma, void *data)
> +{
> + struct mx2_camera_dev *pcdev = data;
> + unsigned int status = readl(pcdev->base_emma + PRP_INTRSTATUS);
> + struct mx2_buffer *buf;
> +
> + if (status & (1 << 7)) { /* overflow */
> + u32 cntl;
> + /*
> + * We only disable channel 1 here since this is the only
> + * enabled channel
> + *
> + * FIXME: the correct DMA overflow handling should be resetting
> + * the buffer, returning an error frame, and continuing with
> + * the next one.
> + */
> + cntl = readl(pcdev->base_emma + PRP_CNTL);
> + writel(cntl & ~PRP_CNTL_CH1EN, pcdev->base_emma + PRP_CNTL);
> + writel(cntl, pcdev->base_emma + PRP_CNTL);
> + }
> + if ((status & (3 << 5)) == (3 << 5)
> + && !list_empty(&pcdev->active_bufs)) {
> + /*
> + * Both buffers have triggered, process the one we're expecting
> + * to first
> + */
> + buf = list_entry(pcdev->active_bufs.next,
> + struct mx2_buffer, vb.queue);
> + mx27_camera_frame_done_emma(pcdev, buf->bufnum, VIDEOBUF_DONE);
> + status &= ~(1 << (6 - buf->bufnum)); /* mark processed */
> + }
> + if (status & (1 << 6))
> + mx27_camera_frame_done_emma(pcdev, 0, VIDEOBUF_DONE);
> + if (status & (1 << 5))
> + mx27_camera_frame_done_emma(pcdev, 1, VIDEOBUF_DONE);
> +
> + writel(status, pcdev->base_emma + PRP_INTRSTATUS);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int __devinit mx27_camera_emma_init(struct mx2_camera_dev *pcdev)
> +{
> + struct resource *res_emma = pcdev->res_emma;
> + int err = 0;
> +
> + if (!request_mem_region(res_emma->start, resource_size(res_emma),
> + MX2_CAM_DRV_NAME)) {
> + err = -EBUSY;
> + goto out;
> + }
> +
> + pcdev->base_emma = ioremap(res_emma->start, resource_size(res_emma));
> + if (!pcdev->base_emma) {
> + err = -ENOMEM;
> + goto exit_release;
> + }
> +
> + err = request_irq(pcdev->irq_emma, mx27_camera_emma_irq, 0,
> + MX2_CAM_DRV_NAME, pcdev);
> + if (err) {
> + dev_err(pcdev->dev, "Camera EMMA interrupt register failed \n");
> + goto exit_iounmap;
> + }
> +
> + pcdev->clk_emma = clk_get(NULL, "emma");
> + if (IS_ERR(pcdev->clk_emma)) {
> + err = PTR_ERR(pcdev->clk_emma);
> + goto exit_free_irq;
> + }
> +
> + clk_enable(pcdev->clk_emma);
> +
> + err = mx27_camera_emma_prp_reset(pcdev);
> + if (err)
> + goto exit_clk_emma_put;
> +
> + return err;
> +
> +exit_clk_emma_put:
> + clk_disable(pcdev->clk_emma);
> + clk_put(pcdev->clk_emma);
> +exit_free_irq:
> + free_irq(pcdev->irq_emma, pcdev);
> +exit_iounmap:
> + iounmap(pcdev->base_emma);
> +exit_release:
> + release_mem_region(res_emma->start, resource_size(res_emma));
> +out:
> + return err;
> +}
> +
> +static int __devinit mx2_camera_probe(struct platform_device *pdev)
> +{
> + struct mx2_camera_dev *pcdev;
> + struct resource *res_csi, *res_emma;
> + void __iomem *base_csi;
> + int irq_csi, irq_emma;
> + irq_handler_t mx2_cam_irq_handler = cpu_is_mx25() ? mx25_camera_irq
> + : mx27_camera_irq;
> + int err = 0;
> +
> + dev_dbg(&pdev->dev, "initialising\n");
> +
> + res_csi = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + irq_csi = platform_get_irq(pdev, 0);
> + if (res_csi == NULL || irq_csi < 0) {
> + dev_err(&pdev->dev, "Missing platform resources data\n");
> + err = -ENODEV;
> + goto exit;
> + }
> +
> + pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
> + if (!pcdev) {
> + dev_err(&pdev->dev, "Could not allocate pcdev\n");
> + err = -ENOMEM;
> + goto exit;
> + }
> +
> + pcdev->clk_csi = clk_get(&pdev->dev, NULL);
> + if (IS_ERR(pcdev->clk_csi)) {
> + err = PTR_ERR(pcdev->clk_csi);
> + goto exit_kfree;
> + }
> +
> + dev_dbg(&pdev->dev, "Camera clock frequency: %ld\n",
> + clk_get_rate(pcdev->clk_csi));
> +
> + /* Initialize DMA */
> +#ifdef CONFIG_MACH_MX27
> + if (cpu_is_mx27()) {
> + err = mx27_camera_dma_init(pdev, pcdev);
> + if (err)
> + goto exit_clk_put;
> + }
> +#endif /* CONFIG_MACH_MX27 */
> +
> + pcdev->res_csi = res_csi;
> + pcdev->pdata = pdev->dev.platform_data;
> + if (pcdev->pdata) {
> + long rate;
> +
> + pcdev->platform_flags = pcdev->pdata->flags;
> +
> + rate = clk_round_rate(pcdev->clk_csi, pcdev->pdata->clk * 2);
> + if (rate <= 0) {
> + err = -ENODEV;
> + goto exit_dma_free;
> + }
> + err = clk_set_rate(pcdev->clk_csi, rate);
> + if (err < 0)
> + goto exit_dma_free;
> + }
> +
> + INIT_LIST_HEAD(&pcdev->capture);
> + INIT_LIST_HEAD(&pcdev->active_bufs);
> + spin_lock_init(&pcdev->lock);
> +
> + /*
> + * Request the regions.
> + */
> + if (!request_mem_region(res_csi->start, resource_size(res_csi),
> + MX2_CAM_DRV_NAME)) {
> + err = -EBUSY;
> + goto exit_dma_free;
> + }
> +
> + base_csi = ioremap(res_csi->start, resource_size(res_csi));
> + if (!base_csi) {
> + err = -ENOMEM;
> + goto exit_release;
> + }
> + pcdev->irq_csi = irq_csi;
> + pcdev->base_csi = base_csi;
> + pcdev->base_dma = res_csi->start;
> + pcdev->dev = &pdev->dev;
> +
> + err = request_irq(pcdev->irq_csi, mx2_cam_irq_handler, 0,
> + MX2_CAM_DRV_NAME, pcdev);
> + if (err) {
> + dev_err(pcdev->dev, "Camera interrupt register failed \n");
> + goto exit_iounmap;
> + }
> +
> + if (cpu_is_mx27()) {
> + /* EMMA support */
> + res_emma = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> + irq_emma = platform_get_irq(pdev, 1);
> +
> + if (res_emma && irq_emma >= 0) {
> + dev_info(&pdev->dev, "Using EMMA\n");
> + pcdev->use_emma = 1;
> + pcdev->res_emma = res_emma;
> + pcdev->irq_emma = irq_emma;
> + if (mx27_camera_emma_init(pcdev))
> + goto exit_free_irq;
> + }
> + }
> +
> + pcdev->soc_host.drv_name = MX2_CAM_DRV_NAME,
> + pcdev->soc_host.ops = &mx2_soc_camera_host_ops,
> + pcdev->soc_host.priv = pcdev;
> + pcdev->soc_host.v4l2_dev.dev = &pdev->dev;
> + pcdev->soc_host.nr = pdev->id;
> + err = soc_camera_host_register(&pcdev->soc_host);
> + if (err)
> + goto exit_free_emma;
> +
> + return 0;
> +
> +exit_free_emma:
> + if (mx27_camera_emma(pcdev)) {
> + free_irq(pcdev->irq_emma, pcdev);
> + clk_disable(pcdev->clk_emma);
> + clk_put(pcdev->clk_emma);
> + iounmap(pcdev->base_emma);
> + release_mem_region(res_emma->start, resource_size(res_emma));
> + }
> +exit_free_irq:
> + free_irq(pcdev->irq_csi, pcdev);
> +exit_iounmap:
> + iounmap(base_csi);
> +exit_release:
> + release_mem_region(res_csi->start, resource_size(res_csi));
> +exit_dma_free:
> +#ifdef CONFIG_MACH_MX27
> + if (cpu_is_mx27())
> + imx_dma_free(pcdev->dma);
> +exit_clk_put:
> + clk_put(pcdev->clk_csi);
> +#endif /* CONFIG_MACH_MX27 */
> +exit_kfree:
> + kfree(pcdev);
> +exit:
> + return err;
> +}
> +
> +static int __devexit mx2_camera_remove(struct platform_device *pdev)
> +{
> + struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
> + struct mx2_camera_dev *pcdev = container_of(soc_host,
> + struct mx2_camera_dev, soc_host);
> + struct resource *res;
> +
> + clk_put(pcdev->clk_csi);
> +#ifdef CONFIG_MACH_MX27
> + if (cpu_is_mx27())
> + imx_dma_free(pcdev->dma);
> +#endif /* CONFIG_MACH_MX27 */
> + free_irq(pcdev->irq_csi, pcdev);
> + if (mx27_camera_emma(pcdev))
> + free_irq(pcdev->irq_emma, pcdev);
> +
> + soc_camera_host_unregister(&pcdev->soc_host);
> +
> + iounmap(pcdev->base_csi);
> +
> + if (mx27_camera_emma(pcdev)) {
> + clk_disable(pcdev->clk_emma);
> + clk_put(pcdev->clk_emma);
> + iounmap(pcdev->base_emma);
> + res = pcdev->res_emma;
> + release_mem_region(res->start, resource_size(res));
> + }
> +
> + res = pcdev->res_csi;
> + release_mem_region(res->start, resource_size(res));
> +
> + kfree(pcdev);
> +
> + dev_info(&pdev->dev, "MX2 Camera driver unloaded\n");
> +
> + return 0;
> +}
> +
> +static struct platform_driver mx2_camera_driver = {
> + .driver = {
> + .name = MX2_CAM_DRV_NAME,
> + },
> + .remove = __devexit_p(mx2_camera_remove),
> +};
> +
> +
> +static int __init mx2_camera_init(void)
> +{
> + return platform_driver_probe(&mx2_camera_driver, &mx2_camera_probe);
> +}
> +
> +static void __exit mx2_camera_exit(void)
> +{
> + return platform_driver_unregister(&mx2_camera_driver);
> +}
> +
> +module_init(mx2_camera_init);
> +module_exit(mx2_camera_exit);
> +
> +MODULE_DESCRIPTION("i.MX27/i.MX25 SoC Camera Host driver");
> +MODULE_AUTHOR("Sascha Hauer <sha@xxxxxxxxxxxxxx>");
> +MODULE_LICENSE("GPL");
> --
> 1.7.1
>
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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