[PATCH v1 03/10] v4l: platform: Add Renesas CEU driver

Jacopo Mondi
2017-11-15T11:16:55Z

Add driver for Renesas Capture Engine Unit (CEU).

The CEU interface supports capturing 'data' (YUV422) and 'images'
(NV[12|21|16|61]).

This driver aims to replace the soc_camera based sh_mobile_ceu one.

Tested with ov7670 camera sensor, providing YUYV_2X8 data on Renesas RZ
platform GR-Peach.

Tested with ov7725 camera sensor on SH4 platform Migo-R.

Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
---
drivers/media/platform/Kconfig | 9 +
drivers/media/platform/Makefile | 2 +
drivers/media/platform/renesas-ceu.c | 1768 ++++++++++++++++++++++++++++++++++
3 files changed, 1779 insertions(+)
create mode 100644 drivers/media/platform/renesas-ceu.c

diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
index 3c4f7fa..401caea 100644
--- a/drivers/media/platform/Kconfig
+++ b/drivers/media/platform/Kconfig
@@ -144,6 +144,15 @@ config VIDEO_STM32_DCMI
To compile this driver as a module, choose M here: the module
will be called stm32-dcmi.

+config VIDEO_RENESAS_CEU
+ tristate "Renesas Capture Engine Unit (CEU) driver"
+ depends on VIDEO_DEV && VIDEO_V4L2 && HAS_DMA
+ depends on ARCH_SHMOBILE || ARCH_R7S72100 || COMPILE_TEST
+ select VIDEOBUF2_DMA_CONTIG
+ select V4L2_FWNODE
+ ---help---
+ This is a v4l2 driver for the Renesas CEU Interface
+
source "drivers/media/platform/soc_camera/Kconfig"
source "drivers/media/platform/exynos4-is/Kconfig"
source "drivers/media/platform/am437x/Kconfig"
diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
index 327f80a..0d1f02b 100644
--- a/drivers/media/platform/Makefile
+++ b/drivers/media/platform/Makefile
@@ -27,6 +27,8 @@ obj-$(CONFIG_VIDEO_CODA) += coda/

obj-$(CONFIG_VIDEO_SH_VEU) += sh_veu.o

+obj-$(CONFIG_VIDEO_RENESAS_CEU) += renesas-ceu.o
+
obj-$(CONFIG_VIDEO_MEM2MEM_DEINTERLACE) += m2m-deinterlace.o

obj-$(CONFIG_VIDEO_MUX) += video-mux.o
diff --git a/drivers/media/platform/renesas-ceu.c b/drivers/media/platform/renesas-ceu.c
new file mode 100644
index 0000000..aaba3cd
--- /dev/null
+++ b/drivers/media/platform/renesas-ceu.c
@@ -0,0 +1,1768 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * V4L2 Driver for Renesas Capture Engine Unit (CEU) interface
+ *
+ * Copyright (C) 2017 Jacopo Mondi <jacopo+renesas@jmondi.org>
+ *
+ * Based on soc-camera driver "soc_camera/sh_mobile_ceu_camera.c"
+ * Copyright (C) 2008 Magnus Damm
+ *
+ * Based on V4L2 Driver for PXA camera host - "pxa_camera.c",
+ * Copyright (C) 2006, Sascha Hauer, Pengutronix
+ * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
+ *
+ * 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/completion.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/io.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/of.h>
+#include <linux/of_graph.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+#include <linux/time.h>
+#include <linux/videodev2.h>
+
+#include <media/v4l2-async.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-dev.h>
+#include <media/v4l2-fwnode.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-image-sizes.h>
+#include <media/v4l2-mediabus.h>
+#include <media/videobuf2-dma-contig.h>
+
+#include <media/drv-intf/renesas-ceu.h>
+
+#define DRIVER_NAME "renesas-ceu"
+
+/* ----------------------------------------------------------------------------
+ * CEU registers offsets and masks
+ */
+#define CEU_CAPSR 0x00 /* Capture start register */
+#define CEU_CAPCR 0x04 /* Capture control register */
+#define CEU_CAMCR 0x08 /* Capture interface control register */
+#define CEU_CAMOR 0x10 /* Capture interface offset register */
+#define CEU_CAPWR 0x14 /* Capture interface width register */
+#define CEU_CAIFR 0x18 /* Capture interface input format register */
+#define CEU_CRCNTR 0x28 /* CEU register control register */
+#define CEU_CRCMPR 0x2c /* CEU register forcible control register */
+#define CEU_CFLCR 0x30 /* Capture filter control register */
+#define CEU_CFSZR 0x34 /* Capture filter size clip register */
+#define CEU_CDWDR 0x38 /* Capture destination width register */
+#define CEU_CDAYR 0x3c /* Capture data address Y register */
+#define CEU_CDACR 0x40 /* Capture data address C register */
+#define CEU_CFWCR 0x5c /* Firewall operation control register */
+#define CEU_CDOCR 0x64 /* Capture data output control register */
+#define CEU_CEIER 0x70 /* Capture event interrupt enable register */
+#define CEU_CETCR 0x74 /* Capture event flag clear register */
+#define CEU_CSTSR 0x7c /* Capture status register */
+#define CEU_CSRTR 0x80 /* Capture software reset register */
+
+/* Data synchronous fetch mode */
+#define CEU_CAMCR_JPEG BIT(4)
+
+/* Input components ordering: CEU_CAMCR.DTARY field */
+#define CEU_CAMCR_DTARY_8_UYVY (0x00 << 8)
+#define CEU_CAMCR_DTARY_8_VYUY (0x01 << 8)
+#define CEU_CAMCR_DTARY_8_YUYV (0x02 << 8)
+#define CEU_CAMCR_DTARY_8_YVYU (0x03 << 8)
+/* TODO: input components ordering for 16 bits input */
+
+/* Bus transfer MTU */
+#define CEU_CAPCR_BUS_WIDTH256 (0x3 << 20)
+
+/* Bus width configuration */
+#define CEU_CAMCR_DTIF_16BITS BIT(12)
+
+/* No downsampling to planar YUV420 in image fetch mode */
+#define CEU_CDOCR_NO_DOWSAMPLE BIT(4)
+
+/* Swap all input data in 8-bit, 16-bits and 32-bits units (Figure 46.45) */
+#define CEU_CDOCR_SWAP_ENDIANNESS (7)
+
+/* Capture reset and enable bits */
+#define CEU_CAPSR_CPKIL BIT(16)
+#define CEU_CAPSR_CE BIT(0)
+
+/* CEU operating flag bit */
+#define CEU_CAPCR_CTNCP BIT(16)
+#define CEU_CSTRST_CPTON BIT(1)
+
+/* Acknowledge magical interrupt sources */
+#define CEU_CETCR_MAGIC 0x0317f313
+/* Prohibited register access interrupt bit */
+#define CEU_CETCR_IGRW BIT(4)
+/* One-frame capture end interrupt */
+#define CEU_CEIER_CPE BIT(0)
+/* VBP error */
+#define CEU_CEIER_VBP BIT(20)
+#define CEU_CEIER_MASK (CEU_CEIER_CPE | CEU_CEIER_VBP)
+
+/* mbus configuration flags */
+#define CEU_BUS_FLAGS (V4L2_MBUS_MASTER | \
+ V4L2_MBUS_PCLK_SAMPLE_RISING | \
+ V4L2_MBUS_HSYNC_ACTIVE_HIGH | \
+ V4L2_MBUS_HSYNC_ACTIVE_LOW | \
+ V4L2_MBUS_VSYNC_ACTIVE_HIGH | \
+ V4L2_MBUS_VSYNC_ACTIVE_LOW | \
+ V4L2_MBUS_DATA_ACTIVE_HIGH)
+
+#define CEU_MAX_WIDTH 2560
+#define CEU_MAX_HEIGHT 1920
+#define CEU_W_MAX(w) ((w) < CEU_MAX_WIDTH ? (w) : CEU_MAX_WIDTH)
+#define CEU_H_MAX(h) ((h) < CEU_MAX_HEIGHT ? (h) : CEU_MAX_HEIGHT)
+
+/* ----------------------------------------------------------------------------
+ * CEU formats
+ */
+
+/**
+ * ceu_bus_fmt - describe a 8-bits yuyv format the sensor can produce
+ *
+ * @mbus_code: bus format code
+ * @fmt_order: CEU_CAMCR.DTARY ordering of input components (Y, Cb, Cr)
+ * @fmt_order_swap: swapped CEU_CAMCR.DTARY ordering of input components
+ * (Y, Cr, Cb)
+ * @swapped: does Cr appear before Cb?
+ * @bps: number of bits sent over bus for each sample
+ * @bpp: number of bits per pixels unit
+ */
+struct ceu_mbus_fmt {
+ u32 mbus_code;
+ u32 fmt_order;
+ u32 fmt_order_swap;
+ bool swapped;
+ u8 bps;
+ u8 bpp;
+};
+
+/**
+ * ceu_buffer - Link vb2 buffer to the list of available buffers
+ */
+struct ceu_buffer {
+ struct vb2_v4l2_buffer vb;
+ struct list_head queue;
+};
+
+static inline struct ceu_buffer *vb2_to_ceu(struct vb2_v4l2_buffer *vbuf)
+{
+ return container_of(vbuf, struct ceu_buffer, vb);
+}
+
+/**
+ * ceu_subdev - Wraps v4l2 sub-device and provides async subdevice.
+ */
+struct ceu_subdev {
+ struct v4l2_subdev *v4l2_sd;
+ struct v4l2_async_subdev asd;
+
+ /* per-subdevice mbus configuration options */
+ unsigned int mbus_flags;
+ struct ceu_mbus_fmt mbus_fmt;
+};
+
+static struct ceu_subdev *to_ceu_subdev(struct v4l2_async_subdev *asd)
+{
+ return container_of(asd, struct ceu_subdev, asd);
+}
+
+/**
+ * ceu_device - CEU device instance
+ */
+struct ceu_device {
+ struct device *dev;
+ struct video_device vdev;
+ struct v4l2_device v4l2_dev;
+
+ /* subdevices descriptors */
+ struct ceu_subdev *subdevs;
+ /* the subdevice currently in use */
+ struct ceu_subdev *sd;
+ unsigned int sd_index;
+ unsigned int num_sd;
+
+ /* currently configured field and pixel format */
+ enum v4l2_field field;
+ struct v4l2_pix_format_mplane v4l2_pix;
+
+ /* async subdev notification helpers */
+ struct v4l2_async_notifier notifier;
+ /* pointers to "struct ceu_subdevice -> asd" */
+ struct v4l2_async_subdev **asds;
+
+ /* vb2 queue, capture buffer list and active buffer pointer */
+ struct vb2_queue vb2_vq;
+ struct list_head capture;
+ struct vb2_v4l2_buffer *active;
+ unsigned int sequence;
+
+ /* mlock - locks on open/close and vb2 operations */
+ struct mutex mlock;
+
+ /* lock - lock access to capture buffer queue and active buffer */
+ spinlock_t lock;
+
+ /* base - CEU memory base address */
+ void __iomem *base;
+};
+
+static inline struct ceu_device *v4l2_to_ceu(struct v4l2_device *v4l2_dev)
+{
+ return container_of(v4l2_dev, struct ceu_device, v4l2_dev);
+}
+
+/* ----------------------------------------------------------------------------
+ * CEU memory output formats
+ */
+
+/**
+ * ceu_fmt - describe a memory output format supported by CEU interface
+ *
+ * @fourcc: memory layout fourcc format code
+ * @bpp: bit for each pixel stored in memory
+ */
+struct ceu_fmt {
+ u32 fourcc;
+ u8 bpp;
+};
+
+/**
+ * ceu_format_list - List of supported memory output formats
+ *
+ * If sensor provides any YUYV bus format, all the following planar memory
+ * formats are available thanks to CEU re-ordering and sub-sampling
+ * capabilities.
+ */
+static const struct ceu_fmt ceu_fmt_list[] = {
+ {
+ .fourcc = V4L2_PIX_FMT_NV16,
+ .bpp = 16,
+ },
+ {
+ .fourcc = V4L2_PIX_FMT_NV61,
+ .bpp = 16,
+ },
+ {
+ .fourcc = V4L2_PIX_FMT_NV12,
+ .bpp = 12,
+ },
+ {
+ .fourcc = V4L2_PIX_FMT_NV21,
+ .bpp = 12,
+ },
+ {
+ .fourcc = V4L2_PIX_FMT_YUYV,
+ .bpp = 16,
+ },
+};
+
+static const struct ceu_fmt *get_ceu_fmt_from_fourcc(unsigned int fourcc)
+{
+ const struct ceu_fmt *fmt = &ceu_fmt_list[0];
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(ceu_fmt_list); i++, fmt++)
+ if (fmt->fourcc == fourcc)
+ return fmt;
+
+ return NULL;
+}
+
+static inline bool ceu_is_fmt_planar(struct v4l2_pix_format_mplane *pix)
+{
+ switch (pix->pixelformat) {
+ case V4L2_PIX_FMT_YUYV:
+ return false;
+ case V4L2_PIX_FMT_NV16:
+ case V4L2_PIX_FMT_NV61:
+ case V4L2_PIX_FMT_NV12:
+ case V4L2_PIX_FMT_NV21:
+ return true;
+ }
+
+ return true;
+}
+
+/* ----------------------------------------------------------------------------
+ * CEU HW operations
+ */
+static void ceu_write(struct ceu_device *priv, unsigned int reg_offs, u32 data)
+{
+ iowrite32(data, priv->base + reg_offs);
+}
+
+static u32 ceu_read(struct ceu_device *priv, unsigned int reg_offs)
+{
+ return ioread32(priv->base + reg_offs);
+}
+
+/**
+ * ceu_soft_reset() - Software reset the CEU interface
+ */
+static int ceu_soft_reset(struct ceu_device *ceudev)
+{
+ unsigned int reset_done;
+ unsigned int i;
+
+ ceu_write(ceudev, CEU_CAPSR, CEU_CAPSR_CPKIL);
+
+ reset_done = 0;
+ for (i = 0; i < 1000 && !reset_done; i++) {
+ udelay(1);
+ if (!(ceu_read(ceudev, CEU_CSTSR) & CEU_CSTRST_CPTON))
+ reset_done++;
+ }
+
+ if (!reset_done) {
+ v4l2_err(&ceudev->v4l2_dev, "soft reset time out\n");
+ return -EIO;
+ }
+
+ reset_done = 0;
+ for (i = 0; i < 1000; i++) {
+ udelay(1);
+ if (!(ceu_read(ceudev, CEU_CAPSR) & CEU_CAPSR_CPKIL))
+ return 0;
+ }
+
+ /* if we get here, CEU has not reset properly */
+ return -EIO;
+}
+
+/* ----------------------------------------------------------------------------
+ * CEU Capture Operations
+ */
+
+/**
+ * ceu_capture() - Trigger start of a capture sequence
+ *
+ * Return value doesn't reflect the success/failure to queue the new buffer,
+ * but rather the status of the previous capture.
+ */
+static int ceu_capture(struct ceu_device *ceudev)
+{
+ struct v4l2_pix_format_mplane *pix = &ceudev->v4l2_pix;
+ dma_addr_t phys_addr_top;
+ u32 status;
+
+ /* Clean interrupt status and re-enable interrupts */
+ status = ceu_read(ceudev, CEU_CETCR);
+ ceu_write(ceudev, CEU_CEIER,
+ ceu_read(ceudev, CEU_CEIER) & ~CEU_CEIER_MASK);
+ ceu_write(ceudev, CEU_CETCR, ~status & CEU_CETCR_MAGIC);
+ ceu_write(ceudev, CEU_CEIER, CEU_CEIER_MASK);
+ ceu_write(ceudev, CEU_CAPCR,
+ ceu_read(ceudev, CEU_CAPCR) & ~CEU_CAPCR_CTNCP);
+
+ /*
+ * When a VBP interrupt occurs, a capture end interrupt does not occur
+ * and the image of that frame is not captured correctly.
+ */
+ if (status & CEU_CEIER_VBP) {
+ v4l2_err(&ceudev->v4l2_dev,
+ "VBP interrupt while capturing\n");
+ ceu_soft_reset(ceudev);
+ return -EIO;
+ } else if (!ceudev->active) {
+ v4l2_err(&ceudev->v4l2_dev,
+ "No available buffers for capture\n");
+ return -EINVAL;
+ }
+
+ phys_addr_top =
+ vb2_dma_contig_plane_dma_addr(&ceudev->active->vb2_buf, 0);
+ ceu_write(ceudev, CEU_CDAYR, phys_addr_top);
+
+ /* Ignore CbCr plane in data sync mode */
+ if (ceu_is_fmt_planar(pix)) {
+ phys_addr_top =
+ vb2_dma_contig_plane_dma_addr(&ceudev->active->vb2_buf,
+ 1);
+ ceu_write(ceudev, CEU_CDACR, phys_addr_top);
+ }
+
+ /*
+ * Trigger new capture start: once per each frame, as we work in
+ * one-frame capture mode
+ */
+ ceu_write(ceudev, CEU_CAPSR, CEU_CAPSR_CE);
+
+ return 0;
+}
+
+static irqreturn_t ceu_irq(int irq, void *data)
+{
+ struct ceu_device *ceudev = data;
+ struct vb2_v4l2_buffer *vbuf;
+ struct ceu_buffer *buf;
+ int ret;
+
+ spin_lock(&ceudev->lock);
+ vbuf = ceudev->active;
+ if (!vbuf)
+ /* Stale interrupt from a released buffer */
+ goto out;
+
+ /* Prepare a new 'active' buffer and trigger a new capture */
+ buf = vb2_to_ceu(vbuf);
+ vbuf->vb2_buf.timestamp = ktime_get_ns();
+
+ if (!list_empty(&ceudev->capture)) {
+ buf = list_first_entry(&ceudev->capture, struct ceu_buffer,
+ queue);
+ list_del(&buf->queue);
+ ceudev->active = &buf->vb;
+ } else {
+ ceudev->active = NULL;
+ }
+
+ /*
+ * If the new capture started successfully, mark the previous buffer
+ * as "DONE".
+ */
+ ret = ceu_capture(ceudev);
+ if (!ret) {
+ vbuf->field = ceudev->field;
+ vbuf->sequence = ceudev->sequence++;
+ }
+
+ vb2_buffer_done(&vbuf->vb2_buf,
+ ret < 0 ? VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
+
+out:
+ spin_unlock(&ceudev->lock);
+
+ return IRQ_HANDLED;
+}
+
+/* ----------------------------------------------------------------------------
+ * CEU Videobuf operations
+ */
+
+/**
+ * ceu_calc_plane_sizes() - Fill 'struct v4l2_plane_pix_format' per plane
+ * information according to the currently configured
+ * pixel format.
+ */
+static int ceu_calc_plane_sizes(struct ceu_device *ceudev,
+ const struct ceu_fmt *ceu_fmt,
+ struct v4l2_pix_format_mplane *pix)
+{
+ struct v4l2_plane_pix_format *plane_fmt = &pix->plane_fmt[0];
+
+ switch (pix->pixelformat) {
+ case V4L2_PIX_FMT_YUYV:
+ pix->num_planes = 1;
+ plane_fmt[0].bytesperline = pix->width * ceu_fmt->bpp / 8;
+ plane_fmt[0].sizeimage = pix->height *
+ plane_fmt[0].bytesperline;
+ break;
+ case V4L2_PIX_FMT_NV16:
+ case V4L2_PIX_FMT_NV61:
+ pix->num_planes = 2;
+ plane_fmt[0].bytesperline = pix->width;
+ plane_fmt[0].sizeimage = pix->height * pix->width;
+ plane_fmt[1] = plane_fmt[0];
+ break;
+ case V4L2_PIX_FMT_NV12:
+ case V4L2_PIX_FMT_NV21:
+ pix->num_planes = 2;
+ plane_fmt[0].bytesperline = pix->width;
+ plane_fmt[0].sizeimage = pix->height * pix->width;
+ plane_fmt[1].bytesperline = pix->width;
+ plane_fmt[1].sizeimage = pix->height * pix->width / 2;
+ break;
+ default:
+ pix->num_planes = 0;
+ v4l2_err(&ceudev->v4l2_dev,
+ "Format 0x%x not supported\n", pix->pixelformat);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/*
+ * ceu_videobuf_setup() - is called to check, whether the driver can accept the
+ * requested number of buffers and to fill in plane sizes
+ * for the current frame format, if required.
+ */
+static int ceu_videobuf_setup(struct vb2_queue *vq, unsigned int *count,
+ unsigned int *num_planes, unsigned int sizes[],
+ struct device *alloc_devs[])
+{
+ struct ceu_device *ceudev = vb2_get_drv_priv(vq);
+ struct v4l2_pix_format_mplane *pix = &ceudev->v4l2_pix;
+ unsigned int i;
+
+ if (!vq->num_buffers)
+ ceudev->sequence = 0;
+
+ if (!*count)
+ *count = 2;
+
+ /* num_planes is set: just check plane sizes */
+ if (*num_planes) {
+ for (i = 0; i < pix->num_planes; i++) {
+ if (sizes[i] < pix->plane_fmt[i].sizeimage)
+ return -EINVAL;
+ }
+
+ return 0;
+ }
+
+ /* num_planes not set: called from REQBUFS, just set plane sizes */
+ *num_planes = pix->num_planes;
+ for (i = 0; i < pix->num_planes; i++)
+ sizes[i] = pix->plane_fmt[i].sizeimage;
+
+ return 0;
+}
+
+static void ceu_videobuf_queue(struct vb2_buffer *vb)
+{
+ struct ceu_device *ceudev = vb2_get_drv_priv(vb->vb2_queue);
+ struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+ struct v4l2_pix_format_mplane *pix = &ceudev->v4l2_pix;
+ struct ceu_buffer *buf = vb2_to_ceu(vbuf);
+ unsigned long irqflags;
+ unsigned int i;
+
+ for (i = 0; i < pix->num_planes; i++) {
+ if (vb2_plane_size(vb, i) < pix->plane_fmt[i].sizeimage) {
+ v4l2_err(&ceudev->v4l2_dev,
+ "Buffer #%d too small (%lu < %u)\n",
+ vb->index, vb2_plane_size(vb, i),
+ pix->plane_fmt[i].sizeimage);
+ goto error;
+ }
+
+ vb2_set_plane_payload(vb, i, pix->plane_fmt[i].sizeimage);
+ }
+
+ spin_lock_irqsave(&ceudev->lock, irqflags);
+ list_add_tail(&buf->queue, &ceudev->capture);
+ spin_unlock_irqrestore(&ceudev->lock, irqflags);
+
+ return;
+
+error:
+ vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
+}
+
+static int ceu_start_streaming(struct vb2_queue *vq, unsigned int count)
+{
+ struct ceu_device *ceudev = vb2_get_drv_priv(vq);
+ struct v4l2_subdev *v4l2_sd = ceudev->sd->v4l2_sd;
+ struct ceu_buffer *buf;
+ unsigned long irqflags;
+ int ret = 0;
+
+ ret = v4l2_subdev_call(v4l2_sd, video, s_stream, 1);
+ if (ret && ret != -ENOIOCTLCMD) {
+ v4l2_err(&ceudev->v4l2_dev,
+ "Subdevice failed to start streaming: %d\n", ret);
+ goto error_return_bufs;
+ }
+
+ spin_lock_irqsave(&ceudev->lock, irqflags);
+ ceudev->sequence = 0;
+
+ if (ceudev->active) {
+ ret = -EINVAL;
+ spin_unlock_irqrestore(&ceudev->lock, irqflags);
+ goto error_stop_sensor;
+ }
+
+ /* Grab the first available buffer and trigger the first capture. */
+ buf = list_first_entry(&ceudev->capture, struct ceu_buffer,
+ queue);
+ list_del(&buf->queue);
+
+ ceudev->active = &buf->vb;
+ ret = ceu_capture(ceudev);
+ if (ret) {
+ spin_unlock_irqrestore(&ceudev->lock, irqflags);
+ goto error_stop_sensor;
+ }
+
+ spin_unlock_irqrestore(&ceudev->lock, irqflags);
+
+ return 0;
+
+error_stop_sensor:
+ v4l2_subdev_call(v4l2_sd, video, s_stream, 0);
+
+error_return_bufs:
+ spin_lock_irqsave(&ceudev->lock, irqflags);
+ list_for_each_entry(buf, &ceudev->capture, queue)
+ vb2_buffer_done(&ceudev->active->vb2_buf,
+ VB2_BUF_STATE_QUEUED);
+ ceudev->active = NULL;
+ spin_unlock_irqrestore(&ceudev->lock, irqflags);
+
+ return ret;
+}
+
+static void ceu_stop_streaming(struct vb2_queue *vq)
+{
+ struct ceu_device *ceudev = vb2_get_drv_priv(vq);
+ struct v4l2_subdev *v4l2_sd = ceudev->sd->v4l2_sd;
+ struct ceu_buffer *buf;
+ unsigned long irqflags;
+
+ v4l2_subdev_call(v4l2_sd, video, s_stream, 0);
+
+ spin_lock_irqsave(&ceudev->lock, irqflags);
+ if (ceudev->active) {
+ vb2_buffer_done(&ceudev->active->vb2_buf,
+ VB2_BUF_STATE_ERROR);
+ ceudev->active = NULL;
+ }
+
+ /* Release all queued buffers */
+ list_for_each_entry(buf, &ceudev->capture, queue)
+ vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
+ INIT_LIST_HEAD(&ceudev->capture);
+
+ spin_unlock_irqrestore(&ceudev->lock, irqflags);
+
+ ceu_soft_reset(ceudev);
+}
+
+static const struct vb2_ops ceu_videobuf_ops = {
+ .queue_setup = ceu_videobuf_setup,
+ .buf_queue = ceu_videobuf_queue,
+ .wait_prepare = vb2_ops_wait_prepare,
+ .wait_finish = vb2_ops_wait_finish,
+ .start_streaming = ceu_start_streaming,
+ .stop_streaming = ceu_stop_streaming,
+};
+
+/**
+ * ----------------------------------------------------------------------------
+ * CEU bus operations
+ */
+static unsigned int ceu_mbus_config_compatible(
+ const struct v4l2_mbus_config *cfg,
+ unsigned int ceu_host_flags)
+{
+ unsigned int common_flags = cfg->flags & ceu_host_flags;
+ bool hsync, vsync, pclk, data, mode;
+
+ switch (cfg->type) {
+ case V4L2_MBUS_PARALLEL:
+ hsync = common_flags & (V4L2_MBUS_HSYNC_ACTIVE_HIGH |
+ V4L2_MBUS_HSYNC_ACTIVE_LOW);
+ vsync = common_flags & (V4L2_MBUS_VSYNC_ACTIVE_HIGH |
+ V4L2_MBUS_VSYNC_ACTIVE_LOW);
+ pclk = common_flags & (V4L2_MBUS_PCLK_SAMPLE_RISING |
+ V4L2_MBUS_PCLK_SAMPLE_FALLING);
+ data = common_flags & (V4L2_MBUS_DATA_ACTIVE_HIGH |
+ V4L2_MBUS_DATA_ACTIVE_LOW);
+ mode = common_flags & (V4L2_MBUS_MASTER | V4L2_MBUS_SLAVE);
+ break;
+ default:
+ return 0;
+ }
+
+ return (hsync && vsync && pclk && data && mode) ? common_flags : 0;
+}
+
+/**
+ * ceu_test_mbus_param() - test bus parameters against sensor provided ones.
+ *
+ * @return: < 0 for errors
+ * 0 if g_mbus_config is not supported,
+ * > 0 for bus configuration flags supported by (ceu AND sensor)
+ */
+static int ceu_test_mbus_param(struct ceu_device *ceudev)
+{
+ struct v4l2_subdev *sd = ceudev->sd->v4l2_sd;
+ unsigned long common_flags = CEU_BUS_FLAGS;
+ struct v4l2_mbus_config cfg = {
+ .type = V4L2_MBUS_PARALLEL,
+ };
+ int ret;
+
+ ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
+ if (ret < 0 && ret != -ENOIOCTLCMD)
+ return ret;
+ else if (ret == -ENOIOCTLCMD)
+ return 0;
+
+ common_flags = ceu_mbus_config_compatible(&cfg, common_flags);
+ if (!common_flags)
+ return -EINVAL;
+
+ return common_flags;
+}
+
+/**
+ * ceu_set_bus_params() - Configure CEU interface registers using bus
+ * parameters
+ */
+static int ceu_set_bus_params(struct ceu_device *ceudev)
+{
+ u32 camcr = 0, cdocr = 0, cfzsr = 0, cdwdr = 0, capwr = 0;
+ struct v4l2_pix_format_mplane *pix = &ceudev->v4l2_pix;
+ struct ceu_subdev *ceu_sd = ceudev->sd;
+ struct ceu_mbus_fmt *mbus_fmt = &ceu_sd->mbus_fmt;
+ struct v4l2_subdev *v4l2_sd = ceu_sd->v4l2_sd;
+ unsigned int mbus_flags = ceu_sd->mbus_flags;
+ unsigned long common_flags = CEU_BUS_FLAGS;
+ int ret;
+ struct v4l2_mbus_config cfg = {
+ .type = V4L2_MBUS_PARALLEL,
+ };
+
+ /*
+ * If client doesn't implement g_mbus_config, we just use our
+ * platform data.
+ */
+ ret = ceu_test_mbus_param(ceudev);
+ if (ret < 0)
+ return ret;
+ else if (ret == 0)
+ common_flags = ceudev->sd->mbus_flags;
+ else
+ common_flags = ret;
+
+ /*
+ * If the we can choose between multiple alternatives select
+ * active high polarities.
+ */
+ if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) &&
+ (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) {
+ if (mbus_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
+ common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW;
+ else
+ common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH;
+ }
+
+ if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) &&
+ (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) {
+ if (mbus_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
+ common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW;
+ else
+ common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH;
+ }
+
+ cfg.flags = common_flags;
+ ret = v4l2_subdev_call(v4l2_sd, video, s_mbus_config, &cfg);
+ if (ret < 0 && ret != -ENOIOCTLCMD)
+ return ret;
+
+ /* Start configuring CEU registers */
+ ceu_write(ceudev, CEU_CAIFR, 0);
+ ceu_write(ceudev, CEU_CFWCR, 0);
+ ceu_write(ceudev, CEU_CRCNTR, 0);
+ ceu_write(ceudev, CEU_CRCMPR, 0);
+
+ /* Set the frame capture period for both image capture and data sync */
+ capwr = (pix->height << 16) | pix->width * mbus_fmt->bpp / 8;
+
+ /*
+ * Swap input data endianness by default.
+ * In data fetch mode bytes are received in chunks of 8 bytes.
+ * D0, D1, D2, D3, D4, D5, D6, D7 (D0 received first)
+ * The data is however by default written to memory in reverse order:
+ * D7, D6, D5, D4, D3, D2, D1, D0 (D7 written to lowest byte)
+ *
+ * Use CEU_CDOCR[2:0] to swap data ordering.
+ */
+ cdocr = CEU_CDOCR_SWAP_ENDIANNESS;
+
+ /*
+ * Configure CAMCR and CDOCR:
+ * match input components ordering with memory output format and
+ * handle downsampling to YUV420.
+ *
+ * If the memory output planar format is 'swapped' (Cr before Cb) and
+ * input format is not, use the swapped version of CAMCR.DTARY.
+ *
+ * If the memory output planar format is not 'swapped' (Cb before Cr)
+ * and input format is, use the swapped version of CAMCR.DTARY.
+ *
+ * CEU by default downsample to planar YUV420 (CDCOR[4] = 0).
+ * If output is planar YUV422 set CDOCR[4] = 1
+ *
+ * No downsample for data fetch sync mode.
+ */
+ switch (pix->pixelformat) {
+ /* data fetch sync mode */
+ case V4L2_PIX_FMT_YUYV:
+ /* TODO: handle YUYV permutations through DTARY bits */
+ camcr |= CEU_CAMCR_JPEG;
+ cdocr |= CEU_CDOCR_NO_DOWSAMPLE;
+ cfzsr = (pix->height << 16) | pix->width;
+ cdwdr = pix->plane_fmt[0].bytesperline;
+ break;
+
+ /* non-swapped planar image capture mode */
+ case V4L2_PIX_FMT_NV16:
+ cdocr |= CEU_CDOCR_NO_DOWSAMPLE;
+ case V4L2_PIX_FMT_NV12:
+ if (mbus_fmt->swapped)
+ camcr |= mbus_fmt->fmt_order_swap;
+ else
+ camcr |= mbus_fmt->fmt_order;
+
+ cfzsr = (pix->height << 16) | pix->width;
+ cdwdr = pix->width;
+ break;
+
+ /* swapped planar image capture mode */
+ case V4L2_PIX_FMT_NV61:
+ cdocr |= CEU_CDOCR_NO_DOWSAMPLE;
+ case V4L2_PIX_FMT_NV21:
+ if (mbus_fmt->swapped)
+ camcr |= mbus_fmt->fmt_order;
+ else
+ camcr |= mbus_fmt->fmt_order_swap;
+
+ cfzsr = (pix->height << 16) | pix->width;
+ cdwdr = pix->width;
+ break;
+ }
+
+ camcr |= common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW ? 1 << 1 : 0;
+ camcr |= common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW ? 1 << 0 : 0;
+
+ /* TODO: handle 16 bit bus width with DTIF bit in CAMCR */
+ ceu_write(ceudev, CEU_CAMCR, camcr);
+ ceu_write(ceudev, CEU_CDOCR, cdocr);
+ ceu_write(ceudev, CEU_CAPCR, CEU_CAPCR_BUS_WIDTH256);
+
+ /*
+ * TODO: make CAMOR offsets configurable.
+ * CAMOR wants to know the number of blanks between a VS/HS signal
+ * and valid data. This value should actually come from the sensor...
+ */
+ ceu_write(ceudev, CEU_CAMOR, 0);
+
+ /* TODO: 16 bit bus width require re-calculation of cdwdr and cfzsr */
+ ceu_write(ceudev, CEU_CAPWR, capwr);
+ ceu_write(ceudev, CEU_CFSZR, cfzsr);
+ ceu_write(ceudev, CEU_CDWDR, cdwdr);
+
+ return 0;
+}
+
+/**
+ * ----------------------------------------------------------------------------
+ * CEU image formats handling
+ */
+
+/**
+ * ceu_try_fmt() - test format on CEU and sensor
+ *
+ * @v4l2_fmt: format to test
+ */
+static int ceu_try_fmt(struct ceu_device *ceudev, struct v4l2_format *v4l2_fmt)
+{
+ struct v4l2_pix_format_mplane *pix = &v4l2_fmt->fmt.pix_mp;
+ struct ceu_subdev *ceu_sd = ceudev->sd;
+ struct v4l2_subdev *v4l2_sd = ceu_sd->v4l2_sd;
+ struct v4l2_subdev_pad_config pad_cfg;
+ const struct ceu_fmt *ceu_fmt;
+ int ret;
+
+ struct v4l2_subdev_format sd_format = {
+ .which = V4L2_SUBDEV_FORMAT_TRY,
+ };
+
+ switch (pix->pixelformat) {
+ case V4L2_PIX_FMT_YUYV:
+ case V4L2_PIX_FMT_NV16:
+ case V4L2_PIX_FMT_NV61:
+ case V4L2_PIX_FMT_NV12:
+ case V4L2_PIX_FMT_NV21:
+ break;
+
+ default:
+ v4l2_err(&ceudev->v4l2_dev,
+ "Pixel format 0x%x not supported, default to NV16\n",
+ pix->pixelformat);
+ pix->pixelformat = V4L2_PIX_FMT_NV16;
+ }
+
+ ceu_fmt = get_ceu_fmt_from_fourcc(pix->pixelformat);
+
+ /* CFSZR requires height and width to be 4-pixel aligned */
+ v4l_bound_align_image(&pix->width, 2, CEU_MAX_WIDTH, 2,
+ &pix->height, 4, CEU_MAX_HEIGHT, 2, 0);
+
+ /*
+ * Set format on sensor sub device: bus format used to produce memory
+ * format is selected at initialization time
+ */
+ v4l2_fill_mbus_format_mplane(&sd_format.format, pix);
+ ret = v4l2_subdev_call(v4l2_sd, pad, set_fmt, &pad_cfg, &sd_format);
+ if (ret)
+ return ret;
+
+ /* Scale down to sensor supported sizes */
+ if (sd_format.format.width != pix->width ||
+ sd_format.format.height != pix->height) {
+ v4l2_err(&ceudev->v4l2_dev,
+ "Unable to apply: 0x%x - %ux%u - scale to %ux%u\n",
+ pix->pixelformat, pix->width, pix->height,
+ sd_format.format.width, sd_format.format.height);
+ pix->width = sd_format.format.width;
+ pix->height = sd_format.format.height;
+ }
+
+ /* Calculate per-plane sizes based on image format */
+ v4l2_fill_pix_format_mplane(pix, &sd_format.format);
+ pix->field = V4L2_FIELD_NONE;
+ ret = ceu_calc_plane_sizes(ceudev, ceu_fmt, pix);
+ if (ret < 0)
+ return ret;
+
+ ret = ceu_test_mbus_param(ceudev);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+/**
+ * ceu_set_fmt() - Apply the supplied format to both sensor and CEU
+ */
+static int ceu_set_fmt(struct ceu_device *ceudev, struct v4l2_format *v4l2_fmt)
+{
+ struct ceu_subdev *ceu_sd = ceudev->sd;
+ struct v4l2_subdev *v4l2_sd = ceu_sd->v4l2_sd;
+ int ret;
+
+ struct v4l2_subdev_format format = {
+ .which = V4L2_SUBDEV_FORMAT_ACTIVE,
+ };
+
+ ret = ceu_try_fmt(ceudev, v4l2_fmt);
+ if (ret)
+ return ret;
+
+ v4l2_fill_mbus_format_mplane(&format.format, &v4l2_fmt->fmt.pix_mp);
+ ret = v4l2_subdev_call(v4l2_sd, pad, set_fmt, NULL, &format);
+ if (ret)
+ return ret;
+
+ ceudev->v4l2_pix = v4l2_fmt->fmt.pix_mp;
+
+ ret = ceu_set_bus_params(ceudev);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+/**
+ * ceu_set_default_fmt() - Apply default NV16 memory output format with VGA
+ * sizes.
+ */
+static int ceu_set_default_fmt(struct ceu_device *ceudev)
+{
+ int ret;
+ struct v4l2_format v4l2_fmt = {
+ .type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE,
+ .fmt.pix_mp = {
+ .width = VGA_WIDTH,
+ .height = VGA_HEIGHT,
+ .field = V4L2_FIELD_NONE,
+ .pixelformat = V4L2_PIX_FMT_NV16,
+ .plane_fmt = {
+ [0] = {
+ .sizeimage = VGA_WIDTH * VGA_HEIGHT * 2,
+ .bytesperline = VGA_WIDTH * 2,
+ },
+ [1] = {
+ .sizeimage = VGA_WIDTH * VGA_HEIGHT * 2,
+ .bytesperline = VGA_WIDTH * 2,
+ },
+ },
+ },
+ };
+
+ ret = ceu_try_fmt(ceudev, &v4l2_fmt);
+ if (ret)
+ return ret;
+
+ ceudev->v4l2_pix = v4l2_fmt.fmt.pix_mp;
+
+ return 0;
+}
+
+/**
+ * ceu_init_formats() - Query sensor for supported formats and initialize
+ * CEU supported format list
+ *
+ * Find out if sensor can produce a permutation of 8-bits YUYV bus format.
+ * From a single 8-bits YUYV bus format the CEU can produce several memory
+ * output formats:
+ * - NV[12|21|16|61] through image fetch mode;
+ * - YUYV422 if sensor provides YUYV422
+ *
+ * TODO: Other YUYV422 permutations throug data fetch sync mode and DTARY
+ * TODO: Binary data (eg. JPEG) and raw formats through data fetch sync mode
+ */
+static int ceu_init_formats(struct ceu_device *ceudev)
+{
+ struct ceu_subdev *ceu_sd = ceudev->sd;
+ struct ceu_mbus_fmt *mbus_fmt = &ceu_sd->mbus_fmt;
+ struct v4l2_subdev *v4l2_sd = ceu_sd->v4l2_sd;
+ bool yuyv_bus_fmt = false;
+
+ struct v4l2_subdev_mbus_code_enum sd_mbus_fmt = {
+ .which = V4L2_SUBDEV_FORMAT_ACTIVE,
+ .index = 0,
+ };
+
+ /* Find out if sensor can produce any permutation of 8-bits YUYV422 */
+ while (!yuyv_bus_fmt &&
+ !v4l2_subdev_call(v4l2_sd, pad, enum_mbus_code,
+ NULL, &sd_mbus_fmt)) {
+ switch (sd_mbus_fmt.code) {
+ case MEDIA_BUS_FMT_YUYV8_2X8:
+ case MEDIA_BUS_FMT_YVYU8_2X8:
+ case MEDIA_BUS_FMT_UYVY8_2X8:
+ case MEDIA_BUS_FMT_VYUY8_2X8:
+ yuyv_bus_fmt = true;
+ break;
+ default:
+ /*
+ * Only support 8-bits YUYV bus formats at the moment;
+ *
+ * TODO: add support for binary formats (data sync
+ * fetch mode).
+ */
+ break;
+ }
+
+ sd_mbus_fmt.index++;
+ }
+
+ if (!yuyv_bus_fmt)
+ return -ENXIO;
+
+ /*
+ * Save the first encountered YUYV format as "mbus_fmt" and use it
+ * to output all planar YUV422 and YUV420 (NV*) formats to memory as
+ * well as for data synch fetch mode (YUYV - YVYU etc. ).
+ */
+ mbus_fmt->mbus_code = sd_mbus_fmt.code;
+ mbus_fmt->bps = 8;
+
+ /* Annotate the selected bus format components ordering */
+ switch (sd_mbus_fmt.code) {
+ case MEDIA_BUS_FMT_YUYV8_2X8:
+ mbus_fmt->fmt_order = CEU_CAMCR_DTARY_8_YUYV;
+ mbus_fmt->fmt_order_swap = CEU_CAMCR_DTARY_8_YVYU;
+ mbus_fmt->swapped = false;
+ mbus_fmt->bpp = 16;
+ break;
+
+ case MEDIA_BUS_FMT_YVYU8_2X8:
+ mbus_fmt->fmt_order = CEU_CAMCR_DTARY_8_YVYU;
+ mbus_fmt->fmt_order_swap = CEU_CAMCR_DTARY_8_YUYV;
+ mbus_fmt->swapped = true;
+ mbus_fmt->bpp = 16;
+ break;
+
+ case MEDIA_BUS_FMT_UYVY8_2X8:
+ mbus_fmt->fmt_order = CEU_CAMCR_DTARY_8_UYVY;
+ mbus_fmt->fmt_order_swap = CEU_CAMCR_DTARY_8_VYUY;
+ mbus_fmt->swapped = false;
+ mbus_fmt->bpp = 16;
+ break;
+
+ case MEDIA_BUS_FMT_VYUY8_2X8:
+ mbus_fmt->fmt_order = CEU_CAMCR_DTARY_8_VYUY;
+ mbus_fmt->fmt_order_swap = CEU_CAMCR_DTARY_8_UYVY;
+ mbus_fmt->swapped = true;
+ mbus_fmt->bpp = 16;
+ break;
+ }
+
+ ceudev->field = V4L2_FIELD_NONE;
+
+ return 0;
+}
+
+/**
+ * ----------------------------------------------------------------------------
+ * Runtime PM Handlers
+ */
+
+/**
+ * ceu_runtime_suspend() - disable capture and interrupts and soft-reset.
+ * Turn sensor power off.
+ */
+static int ceu_runtime_suspend(struct device *dev)
+{
+ struct ceu_device *ceudev = dev_get_drvdata(dev);
+ struct v4l2_subdev *v4l2_sd = ceudev->sd->v4l2_sd;
+
+ v4l2_subdev_call(v4l2_sd, core, s_power, 0);
+
+ ceu_write(ceudev, CEU_CEIER, 0);
+ ceu_soft_reset(ceudev);
+
+ return 0;
+}
+
+/**
+ * ceu_runtime_resume() - soft-reset the interface and turn sensor power on.
+ */
+static int ceu_runtime_resume(struct device *dev)
+{
+ struct ceu_device *ceudev = dev_get_drvdata(dev);
+ struct v4l2_subdev *v4l2_sd = ceudev->sd->v4l2_sd;
+
+ v4l2_subdev_call(v4l2_sd, core, s_power, 1);
+
+ ceu_soft_reset(ceudev);
+
+ return 0;
+}
+
+/**
+ * ----------------------------------------------------------------------------
+ * File Operations
+ */
+static int ceu_open(struct file *file)
+{
+ struct ceu_device *ceudev = video_drvdata(file);
+ int ret;
+
+ ret = v4l2_fh_open(file);
+ if (ret)
+ return ret;
+
+ mutex_lock(&ceudev->mlock);
+ /* Causes soft-reset and sensor power on on first open */
+ pm_runtime_get_sync(ceudev->dev);
+ mutex_unlock(&ceudev->mlock);
+
+ return 0;
+}
+
+static int ceu_release(struct file *file)
+{
+ struct ceu_device *ceudev = video_drvdata(file);
+
+ vb2_fop_release(file);
+
+ mutex_lock(&ceudev->mlock);
+ /* Causes soft-reset and sensor power down on last close */
+ pm_runtime_put(ceudev->dev);
+ mutex_unlock(&ceudev->mlock);
+
+ return 0;
+}
+
+static const struct v4l2_file_operations ceu_fops = {
+ .owner = THIS_MODULE,
+ .open = ceu_open,
+ .release = ceu_release,
+ .unlocked_ioctl = video_ioctl2,
+ .read = vb2_fop_read,
+ .mmap = vb2_fop_mmap,
+ .poll = vb2_fop_poll,
+};
+
+/**
+ * ----------------------------------------------------------------------------
+ * Video Device IOCTLs
+ */
+static int ceu_querycap(struct file *file, void *priv,
+ struct v4l2_capability *cap)
+{
+ strlcpy(cap->card, "Renesas-CEU", sizeof(cap->card));
+ strlcpy(cap->driver, DRIVER_NAME, sizeof(cap->driver));
+ strlcpy(cap->bus_info, "platform:renesas-ceu", sizeof(cap->bus_info));
+
+ return 0;
+}
+
+static int ceu_enum_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_fmtdesc *f)
+{
+ const struct ceu_fmt *fmt;
+
+ if (f->index >= ARRAY_SIZE(ceu_fmt_list) - 1)
+ return -EINVAL;
+
+ fmt = &ceu_fmt_list[f->index];
+ f->pixelformat = fmt->fourcc;
+
+ return 0;
+}
+
+static int ceu_try_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ struct ceu_device *ceudev = video_drvdata(file);
+
+ return ceu_try_fmt(ceudev, f);
+}
+
+static int ceu_s_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ struct ceu_device *ceudev = video_drvdata(file);
+
+ if (vb2_is_streaming(&ceudev->vb2_vq))
+ return -EBUSY;
+
+ return ceu_set_fmt(ceudev, f);
+}
+
+static int ceu_g_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ struct ceu_device *ceudev = video_drvdata(file);
+
+ if (vb2_is_streaming(&ceudev->vb2_vq))
+ return -EBUSY;
+
+ f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
+ f->fmt.pix_mp = ceudev->v4l2_pix;
+
+ return 0;
+}
+
+static int ceu_enum_input(struct file *file, void *priv,
+ struct v4l2_input *inp)
+{
+ if (inp->index != 0)
+ return -EINVAL;
+
+ inp->type = V4L2_INPUT_TYPE_CAMERA;
+ inp->std = 0;
+ strcpy(inp->name, "Camera");
+
+ return 0;
+}
+
+static int ceu_g_input(struct file *file, void *priv, unsigned int *i)
+{
+ struct ceu_device *ceudev = video_drvdata(file);
+
+ *i = ceudev->sd_index;
+
+ return 0;
+}
+
+static int ceu_s_input(struct file *file, void *priv, unsigned int i)
+{
+ struct ceu_device *ceudev = video_drvdata(file);
+ struct ceu_subdev *ceu_sd_old;
+ int ret;
+
+ if (i >= ceudev->num_sd)
+ return -EINVAL;
+
+ ceu_sd_old = ceudev->sd;
+ ceudev->sd = &ceudev->subdevs[i];
+
+ /* Make sure we can generate output image formats. */
+ ret = ceu_init_formats(ceudev);
+ if (ret) {
+ ceudev->sd = ceu_sd_old;
+ return -EINVAL;
+ }
+
+ /* now that we're sure we can use the sensor, power off the old one */
+ v4l2_subdev_call(ceu_sd_old->v4l2_sd, core, s_power, 0);
+ v4l2_subdev_call(ceudev->sd->v4l2_sd, core, s_power, 1);
+
+ ceudev->sd_index = i;
+
+ return 0;
+}
+
+static int ceu_g_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
+{
+ struct ceu_device *ceudev = video_drvdata(file);
+
+ if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
+ return -EINVAL;
+
+ return v4l2_subdev_call(ceudev->sd->v4l2_sd, video, g_parm, a);
+}
+
+static int ceu_s_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
+{
+ struct ceu_device *ceudev = video_drvdata(file);
+
+ if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
+ return -EINVAL;
+
+ return v4l2_subdev_call(ceudev->sd->v4l2_sd, video, s_parm, a);
+}
+
+static int ceu_enum_framesizes(struct file *file, void *fh,
+ struct v4l2_frmsizeenum *fsize)
+{
+ struct ceu_device *ceudev = video_drvdata(file);
+ struct ceu_subdev *ceu_sd = ceudev->sd;
+ struct v4l2_subdev *v4l2_sd = ceu_sd->v4l2_sd;
+ int ret;
+
+ struct v4l2_subdev_frame_size_enum fse = {
+ .code = ceu_sd->mbus_fmt.mbus_code,
+ .index = fsize->index,
+ .which = V4L2_SUBDEV_FORMAT_ACTIVE,
+ };
+
+ ret = v4l2_subdev_call(v4l2_sd, pad, enum_frame_size,
+ NULL, &fse);
+ if (ret)
+ return ret;
+
+ fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
+ fsize->discrete.width = CEU_W_MAX(fse.max_width);
+ fsize->discrete.height = CEU_H_MAX(fse.max_height);
+
+ return 0;
+}
+
+static int ceu_enum_frameintervals(struct file *file, void *fh,
+ struct v4l2_frmivalenum *fival)
+{
+ struct ceu_device *ceudev = video_drvdata(file);
+ struct ceu_subdev *ceu_sd = ceudev->sd;
+ struct v4l2_subdev *v4l2_sd = ceu_sd->v4l2_sd;
+ int ret;
+
+ struct v4l2_subdev_frame_interval_enum fie = {
+ .code = ceu_sd->mbus_fmt.mbus_code,
+ .index = fival->index,
+ .width = fival->width,
+ .height = fival->height,
+ .which = V4L2_SUBDEV_FORMAT_ACTIVE,
+ };
+
+ ret = v4l2_subdev_call(v4l2_sd, pad, enum_frame_interval, NULL,
+ &fie);
+ if (ret)
+ return ret;
+
+ fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
+ fival->discrete = fie.interval;
+
+ return 0;
+}
+
+static const struct v4l2_ioctl_ops ceu_ioctl_ops = {
+ .vidioc_querycap = ceu_querycap,
+
+ .vidioc_enum_fmt_vid_cap_mplane = ceu_enum_fmt_vid_cap,
+ .vidioc_try_fmt_vid_cap_mplane = ceu_try_fmt_vid_cap,
+ .vidioc_s_fmt_vid_cap_mplane = ceu_s_fmt_vid_cap,
+ .vidioc_g_fmt_vid_cap_mplane = ceu_g_fmt_vid_cap,
+
+ .vidioc_enum_input = ceu_enum_input,
+ .vidioc_g_input = ceu_g_input,
+ .vidioc_s_input = ceu_s_input,
+
+ .vidioc_reqbufs = vb2_ioctl_reqbufs,
+ .vidioc_querybuf = vb2_ioctl_querybuf,
+ .vidioc_qbuf = vb2_ioctl_qbuf,
+ .vidioc_expbuf = vb2_ioctl_expbuf,
+ .vidioc_dqbuf = vb2_ioctl_dqbuf,
+ .vidioc_create_bufs = vb2_ioctl_create_bufs,
+ .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
+ .vidioc_streamon = vb2_ioctl_streamon,
+ .vidioc_streamoff = vb2_ioctl_streamoff,
+
+ .vidioc_g_parm = ceu_g_parm,
+ .vidioc_s_parm = ceu_s_parm,
+ .vidioc_enum_framesizes = ceu_enum_framesizes,
+ .vidioc_enum_frameintervals = ceu_enum_frameintervals,
+};
+
+/**
+ * ceu_vdev_release() - release CEU video device memory when last reference
+ * to this driver is closed
+ */
+void ceu_vdev_release(struct video_device *vdev)
+{
+ struct ceu_device *ceudev = video_get_drvdata(vdev);
+
+ kfree(ceudev);
+}
+
+static int ceu_sensor_bound(struct v4l2_async_notifier *notifier,
+ struct v4l2_subdev *v4l2_sd,
+ struct v4l2_async_subdev *asd)
+{
+ struct v4l2_device *v4l2_dev = notifier->v4l2_dev;
+ struct ceu_device *ceudev = v4l2_to_ceu(v4l2_dev);
+ struct ceu_subdev *ceu_sd = to_ceu_subdev(asd);
+
+ if (video_is_registered(&ceudev->vdev)) {
+ v4l2_err(&ceudev->v4l2_dev,
+ "Video device registered before this sub-device.\n");
+ return -EBUSY;
+ }
+
+ /* Assign subdevices in the order they appear */
+ ceu_sd->v4l2_sd = v4l2_sd;
+ ceudev->num_sd++;
+
+ return 0;
+}
+
+static int ceu_sensor_complete(struct v4l2_async_notifier *notifier)
+{
+ struct v4l2_device *v4l2_dev = notifier->v4l2_dev;
+ struct ceu_device *ceudev = v4l2_to_ceu(v4l2_dev);
+ struct video_device *vdev = &ceudev->vdev;
+ struct vb2_queue *q = &ceudev->vb2_vq;
+ struct v4l2_subdev *v4l2_sd;
+ int ret;
+
+ /* Initialize vb2 queue */
+ q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
+ q->io_modes = VB2_MMAP | VB2_USERPTR;
+ q->drv_priv = ceudev;
+ q->ops = &ceu_videobuf_ops;
+ q->mem_ops = &vb2_dma_contig_memops;
+ q->buf_struct_size = sizeof(struct ceu_buffer);
+ q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+ q->lock = &ceudev->mlock;
+ q->dev = ceudev->v4l2_dev.dev;
+
+ ret = vb2_queue_init(q);
+ if (ret)
+ return ret;
+
+ /*
+ * Make sure at least one sensor is primary and use it to initialize
+ * ceu formats
+ */
+ if (!ceudev->sd) {
+ ceudev->sd = &ceudev->subdevs[0];
+ ceudev->sd_index = 0;
+ }
+
+ v4l2_sd = ceudev->sd->v4l2_sd;
+
+ ret = ceu_init_formats(ceudev);
+ if (ret)
+ return ret;
+
+ ret = ceu_set_default_fmt(ceudev);
+ if (ret)
+ return ret;
+
+ /* Register the video device */
+ strncpy(vdev->name, DRIVER_NAME, strlen(DRIVER_NAME));
+ vdev->v4l2_dev = v4l2_dev;
+ vdev->lock = &ceudev->mlock;
+ vdev->queue = &ceudev->vb2_vq;
+ vdev->ctrl_handler = v4l2_sd->ctrl_handler;
+ vdev->fops = &ceu_fops;
+ vdev->ioctl_ops = &ceu_ioctl_ops;
+ vdev->release = ceu_vdev_release;
+ vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE_MPLANE |
+ V4L2_CAP_STREAMING;
+ video_set_drvdata(vdev, ceudev);
+
+ ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
+ if (ret < 0) {
+ v4l2_err(vdev->v4l2_dev,
+ "video_register_device failed: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+/**
+ * ceu_parse_init_sd() - Initialize CEU subdevices and async_subdevs in
+ * ceu device. Both DT and platform data parsing use
+ * this routine.
+ *
+ * @return 0 for success, -ENOMEM for failure.
+ */
+static int ceu_parse_init_sd(struct ceu_device *ceudev, unsigned int n_sd)
+{
+ /* Reserve memory for 'n_sd' ceu_subdev descriptors */
+ ceudev->subdevs = devm_kcalloc(ceudev->dev, n_sd,
+ sizeof(*ceudev->subdevs), GFP_KERNEL);
+ if (!ceudev->subdevs)
+ return -ENOMEM;
+
+ /*
+ * Reserve memory for 'n_sd' pointers to async_subdevices.
+ * ceudev->asds members will point to &ceu_subdev.asd
+ */
+ ceudev->asds = devm_kcalloc(ceudev->dev, n_sd,
+ sizeof(*ceudev->asds), GFP_KERNEL);
+ if (!ceudev->asds)
+ return -ENOMEM;
+
+ ceudev->sd = NULL;
+ ceudev->sd_index = 0;
+ ceudev->num_sd = 0;
+
+ return 0;
+}
+
+/**
+ * ceu_parse_platform_data() - Initialize async_subdevices using platform
+ * device provided data.
+ */
+static int ceu_parse_platform_data(struct ceu_device *ceudev, void *pdata)
+{
+ struct ceu_async_subdev *async_sd;
+ struct ceu_info *info = pdata;
+ struct ceu_subdev *ceu_sd;
+ unsigned int i;
+ int ret;
+
+ ret = ceu_parse_init_sd(ceudev, info->num_subdevs);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < info->num_subdevs; i++) {
+ /* Setup the ceu subdevice and the async subdevice */
+ async_sd = &info->subdevs[i];
+ ceu_sd = &ceudev->subdevs[i];
+
+ memset(&ceu_sd->asd, 0, sizeof(ceu_sd->asd));
+ INIT_LIST_HEAD(&ceu_sd->asd.list);
+
+ ceu_sd->mbus_flags = async_sd->flags;
+ ceu_sd->asd.match_type = V4L2_ASYNC_MATCH_I2C;
+ ceu_sd->asd.match.i2c.adapter_id = async_sd->i2c_adapter_id;
+ ceu_sd->asd.match.i2c.address = async_sd->i2c_address;
+
+ ceudev->asds[i] = &ceu_sd->asd;
+ }
+
+ return info->num_subdevs;
+}
+
+/**
+ * ceu_parse_dt() - Initialize async_subdevs parsing device tree graph
+ */
+static int ceu_parse_dt(struct ceu_device *ceudev)
+{
+ struct device_node *of = ceudev->dev->of_node;
+ struct v4l2_fwnode_endpoint fw_ep;
+ struct ceu_subdev *ceu_sd;
+ struct device_node *ep;
+ unsigned int i;
+ int num_ep;
+ int ret;
+
+ num_ep = of_graph_get_endpoint_count(of);
+ if (num_ep <= 0)
+ return 0;
+
+ ret = ceu_parse_init_sd(ceudev, num_ep);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < num_ep; i++) {
+ ep = of_graph_get_endpoint_by_regs(of, 0, i);
+ if (!ep) {
+ v4l2_err(&ceudev->v4l2_dev,
+ "No subdevice connected on port %u.\n", i);
+ ret = -ENODEV;
+ goto error_put_node;
+ }
+
+ ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(ep), &fw_ep);
+ if (ret) {
+ v4l2_err(&ceudev->v4l2_dev,
+ "Unable to parse endpoint #%u.\n", i);
+ goto error_put_node;
+ }
+
+ if (fw_ep.bus_type != V4L2_MBUS_PARALLEL) {
+ v4l2_err(&ceudev->v4l2_dev,
+ "Only parallel input supported.\n");
+ ret = -EINVAL;
+ goto error_put_node;
+ }
+
+ /* Setup the ceu subdevice and the async subdevice */
+ ceu_sd = &ceudev->subdevs[i];
+ memset(&ceu_sd->asd, 0, sizeof(ceu_sd->asd));
+ INIT_LIST_HEAD(&ceu_sd->asd.list);
+
+ ceu_sd->mbus_flags = fw_ep.bus.parallel.flags;
+ ceu_sd->asd.match_type = V4L2_ASYNC_MATCH_FWNODE;
+ ceu_sd->asd.match.fwnode.fwnode =
+ fwnode_graph_get_remote_port_parent(
+ of_fwnode_handle(ep));
+
+ ceudev->asds[i] = &ceu_sd->asd;
+ of_node_put(ep);
+ }
+
+ return num_ep;
+
+error_put_node:
+ of_node_put(ep);
+ return ret;
+}
+
+static int ceu_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct ceu_device *ceudev;
+ struct resource *res;
+ void __iomem *base;
+ unsigned int irq;
+ int num_sd;
+ int ret;
+
+ ceudev = kzalloc(sizeof(*ceudev), GFP_KERNEL);
+ if (!ceudev)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, ceudev);
+ dev_set_drvdata(dev, ceudev);
+ ceudev->dev = dev;
+
+ INIT_LIST_HEAD(&ceudev->capture);
+ spin_lock_init(&ceudev->lock);
+ mutex_init(&ceudev->mlock);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (IS_ERR(res))
+ return PTR_ERR(res);
+
+ base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+ ceudev->base = base;
+
+ ret = platform_get_irq(pdev, 0);
+ if (ret < 0) {
+ dev_err(dev, "failed to get irq: %d\n", ret);
+ return ret;
+ }
+ irq = ret;
+
+ ret = devm_request_irq(dev, irq, ceu_irq,
+ 0, dev_name(dev), ceudev);
+ if (ret) {
+ dev_err(&pdev->dev, "Unable to register CEU interrupt.\n");
+ return ret;
+ }
+
+ pm_suspend_ignore_children(dev, true);
+ pm_runtime_enable(dev);
+
+ ret = v4l2_device_register(dev, &ceudev->v4l2_dev);
+ if (ret)
+ goto error_pm_disable;
+
+ if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
+ num_sd = ceu_parse_dt(ceudev);
+ } else if (dev->platform_data) {
+ num_sd = ceu_parse_platform_data(ceudev, dev->platform_data);
+ } else {
+ dev_err(dev, "CEU platform data not set and no OF support\n");
+ ret = -EINVAL;
+ goto error_v4l2_unregister;
+ }
+
+ if (num_sd < 0) {
+ ret = num_sd;
+ goto error_v4l2_unregister;
+ } else if (num_sd == 0)
+ return 0;
+
+ ceudev->notifier.v4l2_dev = &ceudev->v4l2_dev;
+ ceudev->notifier.subdevs = ceudev->asds;
+ ceudev->notifier.num_subdevs = num_sd;
+ ceudev->notifier.bound = ceu_sensor_bound;
+ ceudev->notifier.complete = ceu_sensor_complete;
+ ret = v4l2_async_notifier_register(&ceudev->v4l2_dev,
+ &ceudev->notifier);
+ if (ret)
+ goto error_v4l2_unregister_notifier;
+
+ dev_info(dev, "Renesas Capture Engine Unit\n");
+
+ return 0;
+
+error_v4l2_unregister_notifier:
+ v4l2_async_notifier_unregister(&ceudev->notifier);
+error_v4l2_unregister:
+ v4l2_device_unregister(&ceudev->v4l2_dev);
+error_pm_disable:
+ pm_runtime_disable(dev);
+
+ return ret;
+}
+
+static int ceu_remove(struct platform_device *pdev)
+{
+ struct ceu_device *ceudev = platform_get_drvdata(pdev);
+
+ pm_runtime_disable(ceudev->dev);
+
+ v4l2_async_notifier_unregister(&ceudev->notifier);
+
+ v4l2_device_unregister(&ceudev->v4l2_dev);
+
+ video_unregister_device(&ceudev->vdev);
+
+ return 0;
+}
+
+#if IS_ENABLED(CONFIG_OF)
+static const struct of_device_id ceu_of_match[] = {
+ { .compatible = "renesas,renesas-ceu" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ceu_of_match);
+#endif
+
+static const struct dev_pm_ops ceu_pm_ops = {
+ SET_RUNTIME_PM_OPS(ceu_runtime_suspend,
+ ceu_runtime_resume,
+ NULL)
+};
+
+static struct platform_driver ceu_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ .pm = &ceu_pm_ops,
+ .of_match_table = of_match_ptr(ceu_of_match),
+ },
+ .probe = ceu_probe,
+ .remove = ceu_remove,
+};
+
+module_platform_driver(ceu_driver);
+
+MODULE_DESCRIPTION("Renesas CEU camera driver");
+MODULE_AUTHOR("Jacopo Mondi <jacopo+renesas@jmondi.org>");
+MODULE_LICENSE("GPL");
--
2.7.4