[media] media: platform: add VPFE capture driver support for AM437X

This patch adds Video Processing Front End (VPFE) driver for
AM437X family of devices
Driver supports the following:
- V4L2 API using MMAP buffer access based on videobuf2 api
- Asynchronous sensor/decoder sub device registration
- DT support

Signed-off-by: Benoit Parrot <bparrot@ti.com>
Signed-off-by: Darren Etheridge <detheridge@ti.com>
Signed-off-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
[hans.verkuil@cisco.com: swapped two lines to fix vpfe_release() & add pinctrl include]
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

1 files changed, 283 insertions, 0 deletions

diff --git a/drivers/media/platform/am437x/am437x-vpfe.h b/drivers/media/platform/am437x/am437x-vpfe.h
new file mode 100644
index 000000000000..0f557352313d
--- /dev/null
+++ b/drivers/media/platform/am437x/am437x-vpfe.h
@@ -0,0 +1,283 @@
+/*
+ * Copyright (C) 2013 - 2014 Texas Instruments, Inc.
+ *
+ * Benoit Parrot <bparrot@ti.com>
+ * Lad, Prabhakar <prabhakar.csengg@gmail.com>
+ *
+ * This program is free software; you may redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef AM437X_VPFE_H
+#define AM437X_VPFE_H
+
+#include <linux/am437x-vpfe.h>
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/i2c.h>
+#include <linux/videodev2.h>
+
+#include <media/v4l2-dev.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-ioctl.h>
+#include <media/videobuf2-dma-contig.h>
+
+#include "am437x-vpfe_regs.h"
+
+enum vpfe_pin_pol {
+        VPFE_PINPOL_POSITIVE = 0,
+        VPFE_PINPOL_NEGATIVE,
+};
+
+enum vpfe_hw_if_type {
+        /* Raw Bayer */
+        VPFE_RAW_BAYER = 0,
+        /* BT656 - 8 bit */
+        VPFE_BT656,
+        /* BT656 - 10 bit */
+        VPFE_BT656_10BIT,
+        /* YCbCr - 8 bit with external sync */
+        VPFE_YCBCR_SYNC_8,
+        /* YCbCr - 16 bit with external sync */
+        VPFE_YCBCR_SYNC_16,
+};
+
+/* interface description */
+struct vpfe_hw_if_param {
+        enum vpfe_hw_if_type if_type;
+        enum vpfe_pin_pol hdpol;
+        enum vpfe_pin_pol vdpol;
+        unsigned int bus_width;
+};
+
+#define VPFE_MAX_SUBDEV         1
+#define VPFE_MAX_INPUTS         1
+
+struct vpfe_pixel_format {
+        struct v4l2_fmtdesc fmtdesc;
+        /* bytes per pixel */
+        int bpp;
+};
+
+struct vpfe_std_info {
+        int active_pixels;
+        int active_lines;
+        /* current frame format */
+        int frame_format;
+};
+
+struct vpfe_route {
+        u32 input;
+        u32 output;
+};
+
+struct vpfe_subdev_info {
+         char name[32];
+        /* Sub device group id */
+        int grp_id;
+        /* inputs available at the sub device */
+        struct v4l2_input inputs[VPFE_MAX_INPUTS];
+        /* Sub dev routing information for each input */
+        struct vpfe_route *routes;
+        /* check if sub dev supports routing */
+        int can_route;
+        /* ccdc bus/interface configuration */
+        struct vpfe_hw_if_param vpfe_param;
+        struct v4l2_subdev *sd;
+};
+
+struct vpfe_config {
+        /* information about each subdev */
+        struct vpfe_subdev_info sub_devs[VPFE_MAX_SUBDEV];
+        /* Flat array, arranged in groups */
+        struct v4l2_async_subdev *asd[VPFE_MAX_SUBDEV];
+};
+
+struct vpfe_cap_buffer {
+        struct vb2_buffer vb;
+        struct list_head list;
+};
+
+enum ccdc_pixfmt {
+        CCDC_PIXFMT_RAW = 0,
+        CCDC_PIXFMT_YCBCR_16BIT,
+        CCDC_PIXFMT_YCBCR_8BIT,
+};
+
+enum ccdc_frmfmt {
+        CCDC_FRMFMT_PROGRESSIVE = 0,
+        CCDC_FRMFMT_INTERLACED,
+};
+
+/* PIXEL ORDER IN MEMORY from LSB to MSB */
+/* only applicable for 8-bit input mode  */
+enum ccdc_pixorder {
+        CCDC_PIXORDER_YCBYCR,
+        CCDC_PIXORDER_CBYCRY,
+};
+
+enum ccdc_buftype {
+        CCDC_BUFTYPE_FLD_INTERLEAVED,
+        CCDC_BUFTYPE_FLD_SEPARATED
+};
+
+
+/* returns the highest bit used for the gamma */
+static inline u8 ccdc_gamma_width_max_bit(enum vpfe_ccdc_gamma_width width)
+{
+        return 15 - width;
+}
+
+/* returns the highest bit used for this data size */
+static inline u8 ccdc_data_size_max_bit(enum vpfe_ccdc_data_size sz)
+{
+        return sz == VPFE_CCDC_DATA_8BITS ? 7 : 15 - sz;
+}
+
+/* Structure for CCDC configuration parameters for raw capture mode */
+struct ccdc_params_raw {
+        /* pixel format */
+        enum ccdc_pixfmt pix_fmt;
+        /* progressive or interlaced frame */
+        enum ccdc_frmfmt frm_fmt;
+        struct v4l2_rect win;
+        /* Current Format Bytes Per Pixels */
+        unsigned int bytesperpixel;
+        /* Current Format Bytes per Lines
+         * (Aligned to 32 bytes) used for HORZ_INFO
+         */
+        unsigned int bytesperline;
+        /* field id polarity */
+        enum vpfe_pin_pol fid_pol;
+        /* vertical sync polarity */
+        enum vpfe_pin_pol vd_pol;
+        /* horizontal sync polarity */
+        enum vpfe_pin_pol hd_pol;
+        /* interleaved or separated fields */
+        enum ccdc_buftype buf_type;
+        /*
+         * enable to store the image in inverse
+         * order in memory(bottom to top)
+         */
+        unsigned char image_invert_enable;
+        /* configurable parameters */
+        struct vpfe_ccdc_config_params_raw config_params;
+};
+
+struct ccdc_params_ycbcr {
+        /* pixel format */
+        enum ccdc_pixfmt pix_fmt;
+        /* progressive or interlaced frame */
+        enum ccdc_frmfmt frm_fmt;
+        struct v4l2_rect win;
+        /* Current Format Bytes Per Pixels */
+        unsigned int bytesperpixel;
+        /* Current Format Bytes per Lines
+         * (Aligned to 32 bytes) used for HORZ_INFO
+         */
+        unsigned int bytesperline;
+        /* field id polarity */
+        enum vpfe_pin_pol fid_pol;
+        /* vertical sync polarity */
+        enum vpfe_pin_pol vd_pol;
+        /* horizontal sync polarity */
+        enum vpfe_pin_pol hd_pol;
+        /* enable BT.656 embedded sync mode */
+        int bt656_enable;
+        /* cb:y:cr:y or y:cb:y:cr in memory */
+        enum ccdc_pixorder pix_order;
+        /* interleaved or separated fields  */
+        enum ccdc_buftype buf_type;
+};
+
+/*
+ * CCDC operational configuration
+ */
+struct ccdc_config {
+        /* CCDC interface type */
+        enum vpfe_hw_if_type if_type;
+        /* Raw Bayer configuration */
+        struct ccdc_params_raw bayer;
+        /* YCbCr configuration */
+        struct ccdc_params_ycbcr ycbcr;
+        /* ccdc base address */
+        void __iomem *base_addr;
+};
+
+struct vpfe_ccdc {
+        struct ccdc_config ccdc_cfg;
+        u32 ccdc_ctx[VPFE_REG_END / sizeof(u32)];
+};
+
+struct vpfe_device {
+        /* V4l2 specific parameters */
+        /* Identifies video device for this channel */
+        struct video_device *video_dev;
+        /* sub devices */
+        struct v4l2_subdev **sd;
+        /* vpfe cfg */
+        struct vpfe_config *cfg;
+        /* V4l2 device */
+        struct v4l2_device v4l2_dev;
+        /* parent device */
+        struct device *pdev;
+        /* subdevice async Notifier */
+        struct v4l2_async_notifier notifier;
+        /* Indicates id of the field which is being displayed */
+        unsigned field;
+        unsigned sequence;
+        /* current interface type */
+        struct vpfe_hw_if_param vpfe_if_params;
+        /* ptr to currently selected sub device */
+        struct vpfe_subdev_info *current_subdev;
+        /* current input at the sub device */
+        int current_input;
+        /* Keeps track of the information about the standard */
+        struct vpfe_std_info std_info;
+        /* std index into std table */
+        int std_index;
+        /* IRQs used when CCDC output to SDRAM */
+        unsigned int irq;
+        /* Pointer pointing to current v4l2_buffer */
+        struct vpfe_cap_buffer *cur_frm;
+        /* Pointer pointing to next v4l2_buffer */
+        struct vpfe_cap_buffer *next_frm;
+        /* Used to store pixel format */
+        struct v4l2_format fmt;
+        /* Used to store current bytes per pixel based on current format */
+        unsigned int bpp;
+        /*
+         * used when IMP is chained to store the crop window which
+         * is different from the image window
+         */
+        struct v4l2_rect crop;
+        /* Buffer queue used in video-buf */
+        struct vb2_queue buffer_queue;
+        /* Allocator-specific contexts for each plane */
+        struct vb2_alloc_ctx *alloc_ctx;
+        /* Queue of filled frames */
+        struct list_head dma_queue;
+        /* IRQ lock for DMA queue */
+        spinlock_t dma_queue_lock;
+        /* lock used to access this structure */
+        struct mutex lock;
+        /*
+         * offset where second field starts from the starting of the
+         * buffer for field separated YCbCr formats
+         */
+        u32 field_off;
+        struct vpfe_ccdc ccdc;
+};
+
+#endif  /* AM437X_VPFE_H */