[PATCH v4 20/36] media: imx: Add CSI subdev driver

Steve Longerbeam
2017-02-16T02:19:22Z

This is a media entity subdevice for the i.MX Camera
Sensor Interface module.

Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com>
---
drivers/staging/media/imx/Kconfig | 13 +
drivers/staging/media/imx/Makefile | 2 +
drivers/staging/media/imx/imx-media-csi.c | 1220 +++++++++++++++++++++++++++++
3 files changed, 1235 insertions(+)
create mode 100644 drivers/staging/media/imx/imx-media-csi.c

diff --git a/drivers/staging/media/imx/Kconfig b/drivers/staging/media/imx/Kconfig
index 722ed55..e27ad6d 100644
--- a/drivers/staging/media/imx/Kconfig
+++ b/drivers/staging/media/imx/Kconfig
@@ -5,3 +5,16 @@ config VIDEO_IMX_MEDIA
Say yes here to enable support for video4linux media controller
driver for the i.MX5/6 SOC.

+if VIDEO_IMX_MEDIA
+menu "i.MX5/6 Media Sub devices"
+
+config VIDEO_IMX_CSI
+ tristate "i.MX5/6 Camera Sensor Interface driver"
+ depends on VIDEO_IMX_MEDIA && VIDEO_DEV && I2C
+ select VIDEOBUF2_DMA_CONTIG
+ default y
+ ---help---
+ A video4linux camera sensor interface driver for i.MX5/6.
+
+endmenu
+endif
diff --git a/drivers/staging/media/imx/Makefile b/drivers/staging/media/imx/Makefile
index 4606a3a..c054490 100644
--- a/drivers/staging/media/imx/Makefile
+++ b/drivers/staging/media/imx/Makefile
@@ -4,3 +4,5 @@ imx-media-common-objs := imx-media-utils.o imx-media-fim.o
obj-$(CONFIG_VIDEO_IMX_MEDIA) += imx-media.o
obj-$(CONFIG_VIDEO_IMX_MEDIA) += imx-media-common.o
obj-$(CONFIG_VIDEO_IMX_MEDIA) += imx-media-capture.o
+
+obj-$(CONFIG_VIDEO_IMX_CSI) += imx-media-csi.o
diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
new file mode 100644
index 0000000..0343fc3
--- /dev/null
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -0,0 +1,1220 @@
+/*
+ * V4L2 Capture CSI Subdev for Freescale i.MX5/6 SOC
+ *
+ * Copyright (c) 2014-2016 Mentor Graphics Inc.
+ *
+ * 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/interrupt.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-mc.h>
+#include <media/v4l2-of.h>
+#include <media/v4l2-subdev.h>
+#include <media/videobuf2-dma-contig.h>
+#include <video/imx-ipu-v3.h>
+#include <media/imx.h>
+#include "imx-media.h"
+
+/*
+ * Min/Max supported width and heights.
+ *
+ * We allow planar output, so we have to align width by 16 pixels
+ * to meet IDMAC alignment requirements.
+ *
+ * TODO: move this into pad format negotiation, if capture device
+ * has not requested planar formats, we should allow 8 pixel
+ * alignment.
+ */
+#define MIN_W 176
+#define MIN_H 144
+#define MAX_W 4096
+#define MAX_H 4096
+#define W_ALIGN 4 /* multiple of 16 pixels */
+#define H_ALIGN 1 /* multiple of 2 lines */
+#define S_ALIGN 1 /* multiple of 2 */
+
+struct csi_priv {
+ struct device *dev;
+ struct ipu_soc *ipu;
+ struct imx_media_dev *md;
+ struct v4l2_subdev sd;
+ struct media_pad pad[CSI_NUM_PADS];
+ int active_output_pad;
+ int csi_id;
+ int smfc_id;
+
+ struct ipuv3_channel *idmac_ch;
+ struct ipu_smfc *smfc;
+ struct ipu_csi *csi;
+
+ struct v4l2_mbus_framefmt format_mbus[CSI_NUM_PADS];
+ const struct imx_media_pixfmt *cc[CSI_NUM_PADS];
+ struct v4l2_rect crop;
+
+ /* the video device at IDMAC output pad */
+ struct imx_media_video_dev *vdev;
+
+ /* active vb2 buffers to send to video dev sink */
+ struct imx_media_buffer *active_vb2_buf[2];
+ struct imx_media_dma_buf underrun_buf;
+
+ int ipu_buf_num; /* ipu double buffer index: 0-1 */
+
+ /* the sink for the captured frames */
+ struct media_entity *sink;
+ enum ipu_csi_dest dest;
+ /* the source subdev */
+ struct v4l2_subdev *src_sd;
+
+ /* the mipi virtual channel number at link validate */
+ int vc_num;
+
+ /* the attached sensor at stream on */
+ struct imx_media_subdev *sensor;
+
+ spinlock_t irqlock; /* protect eof_irq handler */
+ struct timer_list eof_timeout_timer;
+ int eof_irq;
+ int nfb4eof_irq;
+
+ struct v4l2_ctrl_handler ctrl_hdlr;
+ struct imx_media_fim *fim;
+
+ bool power_on; /* power is on */
+ bool stream_on; /* streaming is on */
+ bool last_eof; /* waiting for last EOF at stream off */
+ struct completion last_eof_comp;
+};
+
+static inline struct csi_priv *sd_to_dev(struct v4l2_subdev *sdev)
+{
+ return container_of(sdev, struct csi_priv, sd);
+}
+
+static void csi_idmac_put_ipu_resources(struct csi_priv *priv)
+{
+ if (!IS_ERR_OR_NULL(priv->idmac_ch))
+ ipu_idmac_put(priv->idmac_ch);
+ priv->idmac_ch = NULL;
+
+ if (!IS_ERR_OR_NULL(priv->smfc))
+ ipu_smfc_put(priv->smfc);
+ priv->smfc = NULL;
+}
+
+static int csi_idmac_get_ipu_resources(struct csi_priv *priv)
+{
+ int ch_num, ret;
+
+ ch_num = IPUV3_CHANNEL_CSI0 + priv->smfc_id;
+
+ priv->smfc = ipu_smfc_get(priv->ipu, ch_num);
+ if (IS_ERR(priv->smfc)) {
+ v4l2_err(&priv->sd, "failed to get SMFC\n");
+ ret = PTR_ERR(priv->smfc);
+ goto out;
+ }
+
+ priv->idmac_ch = ipu_idmac_get(priv->ipu, ch_num);
+ if (IS_ERR(priv->idmac_ch)) {
+ v4l2_err(&priv->sd, "could not get IDMAC channel %u\n",
+ ch_num);
+ ret = PTR_ERR(priv->idmac_ch);
+ goto out;
+ }
+
+ return 0;
+out:
+ csi_idmac_put_ipu_resources(priv);
+ return ret;
+}
+
+static void csi_vb2_buf_done(struct csi_priv *priv)
+{
+ struct imx_media_video_dev *vdev = priv->vdev;
+ struct imx_media_buffer *done, *next;
+ struct vb2_buffer *vb;
+ dma_addr_t phys;
+
+ done = priv->active_vb2_buf[priv->ipu_buf_num];
+ if (done) {
+ vb = &done->vbuf.vb2_buf;
+ vb->timestamp = ktime_get_ns();
+ vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
+ }
+
+ /* get next queued buffer */
+ next = imx_media_capture_device_next_buf(vdev);
+ if (next) {
+ phys = vb2_dma_contig_plane_dma_addr(&next->vbuf.vb2_buf, 0);
+ priv->active_vb2_buf[priv->ipu_buf_num] = next;
+ } else {
+ phys = priv->underrun_buf.phys;
+ priv->active_vb2_buf[priv->ipu_buf_num] = NULL;
+ }
+
+ if (ipu_idmac_buffer_is_ready(priv->idmac_ch, priv->ipu_buf_num))
+ ipu_idmac_clear_buffer(priv->idmac_ch, priv->ipu_buf_num);
+
+ ipu_cpmem_set_buffer(priv->idmac_ch, priv->ipu_buf_num, phys);
+}
+
+static void csi_call_fim(struct csi_priv *priv)
+{
+ if (priv->fim) {
+ struct timespec cur_ts;
+
+ ktime_get_ts(&cur_ts);
+ /* call frame interval monitor */
+ imx_media_fim_eof_monitor(priv->fim, &cur_ts);
+ }
+}
+
+static irqreturn_t csi_idmac_eof_interrupt(int irq, void *dev_id)
+{
+ struct csi_priv *priv = dev_id;
+
+ spin_lock(&priv->irqlock);
+
+ if (priv->last_eof) {
+ complete(&priv->last_eof_comp);
+ priv->last_eof = false;
+ goto unlock;
+ }
+
+ csi_call_fim(priv);
+
+ csi_vb2_buf_done(priv);
+
+ /* select new IPU buf */
+ ipu_idmac_select_buffer(priv->idmac_ch, priv->ipu_buf_num);
+ /* toggle IPU double-buffer index */
+ priv->ipu_buf_num ^= 1;
+
+ /* bump the EOF timeout timer */
+ mod_timer(&priv->eof_timeout_timer,
+ jiffies + msecs_to_jiffies(IMX_MEDIA_EOF_TIMEOUT));
+
+unlock:
+ spin_unlock(&priv->irqlock);
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t csi_idmac_nfb4eof_interrupt(int irq, void *dev_id)
+{
+ struct csi_priv *priv = dev_id;
+ static const struct v4l2_event ev = {
+ .type = V4L2_EVENT_IMX_NFB4EOF,
+ };
+
+ v4l2_err(&priv->sd, "NFB4EOF\n");
+
+ v4l2_subdev_notify_event(&priv->sd, &ev);
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * EOF timeout timer function.
+ */
+static void csi_idmac_eof_timeout(unsigned long data)
+{
+ struct csi_priv *priv = (struct csi_priv *)data;
+ static const struct v4l2_event ev = {
+ .type = V4L2_EVENT_FRAME_TIMEOUT,
+ };
+
+ v4l2_err(&priv->sd, "EOF timeout\n");
+
+ v4l2_subdev_notify_event(&priv->sd, &ev);
+}
+
+static void csi_idmac_setup_vb2_buf(struct csi_priv *priv, dma_addr_t *phys)
+{
+ struct imx_media_video_dev *vdev = priv->vdev;
+ struct imx_media_buffer *buf;
+ int i;
+
+ for (i = 0; i < 2; i++) {
+ buf = imx_media_capture_device_next_buf(vdev);
+ priv->active_vb2_buf[i] = buf;
+ phys[i] = vb2_dma_contig_plane_dma_addr(&buf->vbuf.vb2_buf, 0);
+ }
+}
+
+static void csi_idmac_unsetup_vb2_buf(struct csi_priv *priv)
+{
+ struct imx_media_buffer *buf;
+ int i;
+
+ /* return any remaining active frames with error */
+ for (i = 0; i < 2; i++) {
+ buf = priv->active_vb2_buf[i];
+ if (buf) {
+ struct vb2_buffer *vb = &buf->vbuf.vb2_buf;
+
+ vb->timestamp = ktime_get_ns();
+ vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
+ }
+ }
+}
+
+/* init the SMFC IDMAC channel */
+static int csi_idmac_setup_channel(struct csi_priv *priv)
+{
+ struct imx_media_video_dev *vdev = priv->vdev;
+ struct v4l2_of_endpoint *sensor_ep;
+ struct v4l2_mbus_framefmt *infmt;
+ unsigned int burst_size;
+ struct ipu_image image;
+ dma_addr_t phys[2];
+ bool passthrough;
+ int ret;
+
+ infmt = &priv->format_mbus[CSI_SINK_PAD];
+ sensor_ep = &priv->sensor->sensor_ep;
+
+ ipu_cpmem_zero(priv->idmac_ch);
+
+ memset(&image, 0, sizeof(image));
+ image.pix = vdev->fmt.fmt.pix;
+ image.rect.width = image.pix.width;
+ image.rect.height = image.pix.height;
+
+ csi_idmac_setup_vb2_buf(priv, phys);
+
+ image.phys0 = phys[0];
+ image.phys1 = phys[1];
+
+ ret = ipu_cpmem_set_image(priv->idmac_ch, &image);
+ if (ret)
+ return ret;
+
+ burst_size = (image.pix.width & 0xf) ? 8 : 16;
+
+ ipu_cpmem_set_burstsize(priv->idmac_ch, burst_size);
+
+ /*
+ * If the sensor uses 16-bit parallel CSI bus, we must handle
+ * the data internally in the IPU as 16-bit generic, aka
+ * passthrough mode.
+ */
+ passthrough = (sensor_ep->bus_type != V4L2_MBUS_CSI2 &&
+ sensor_ep->bus.parallel.bus_width >= 16);
+
+ if (passthrough)
+ ipu_cpmem_set_format_passthrough(priv->idmac_ch, 16);
+
+ /*
+ * Set the channel for the direct CSI-->memory via SMFC
+ * use-case to very high priority, by enabling the watermark
+ * signal in the SMFC, enabling WM in the channel, and setting
+ * the channel priority to high.
+ *
+ * Refer to the i.mx6 rev. D TRM Table 36-8: Calculated priority
+ * value.
+ *
+ * The WM's are set very low by intention here to ensure that
+ * the SMFC FIFOs do not overflow.
+ */
+ ipu_smfc_set_watermark(priv->smfc, 0x02, 0x01);
+ ipu_cpmem_set_high_priority(priv->idmac_ch);
+ ipu_idmac_enable_watermark(priv->idmac_ch, true);
+ ipu_cpmem_set_axi_id(priv->idmac_ch, 0);
+ ipu_idmac_lock_enable(priv->idmac_ch, 8);
+
+ burst_size = ipu_cpmem_get_burstsize(priv->idmac_ch);
+ burst_size = passthrough ?
+ (burst_size >> 3) - 1 : (burst_size >> 2) - 1;
+
+ ipu_smfc_set_burstsize(priv->smfc, burst_size);
+
+ if (image.pix.field == V4L2_FIELD_NONE &&
+ V4L2_FIELD_HAS_BOTH(infmt->field))
+ ipu_cpmem_interlaced_scan(priv->idmac_ch,
+ image.pix.bytesperline);
+
+ ipu_idmac_set_double_buffer(priv->idmac_ch, true);
+
+ return 0;
+}
+
+static void csi_idmac_unsetup(struct csi_priv *priv)
+{
+ ipu_idmac_disable_channel(priv->idmac_ch);
+ ipu_smfc_disable(priv->smfc);
+
+ csi_idmac_unsetup_vb2_buf(priv);
+}
+
+static int csi_idmac_setup(struct csi_priv *priv)
+{
+ int ret;
+
+ ret = csi_idmac_setup_channel(priv);
+ if (ret)
+ return ret;
+
+ ipu_cpmem_dump(priv->idmac_ch);
+ ipu_dump(priv->ipu);
+
+ ipu_smfc_enable(priv->smfc);
+
+ /* set buffers ready */
+ ipu_idmac_select_buffer(priv->idmac_ch, 0);
+ ipu_idmac_select_buffer(priv->idmac_ch, 1);
+
+ /* enable the channels */
+ ipu_idmac_enable_channel(priv->idmac_ch);
+
+ return 0;
+}
+
+static int csi_idmac_start(struct csi_priv *priv)
+{
+ struct imx_media_video_dev *vdev = priv->vdev;
+ struct v4l2_pix_format *outfmt;
+ int ret;
+
+ ret = csi_idmac_get_ipu_resources(priv);
+ if (ret)
+ return ret;
+
+ ipu_smfc_map_channel(priv->smfc, priv->csi_id, priv->vc_num);
+
+ outfmt = &vdev->fmt.fmt.pix;
+
+ ret = imx_media_alloc_dma_buf(priv->md, &priv->underrun_buf,
+ outfmt->sizeimage);
+ if (ret)
+ goto out_put_ipu;
+
+ priv->ipu_buf_num = 0;
+
+ /* init EOF completion waitq */
+ init_completion(&priv->last_eof_comp);
+ priv->last_eof = false;
+
+ ret = csi_idmac_setup(priv);
+ if (ret) {
+ v4l2_err(&priv->sd, "csi_idmac_setup failed: %d\n", ret);
+ goto out_free_dma_buf;
+ }
+
+ priv->nfb4eof_irq = ipu_idmac_channel_irq(priv->ipu,
+ priv->idmac_ch,
+ IPU_IRQ_NFB4EOF);
+ ret = devm_request_irq(priv->dev, priv->nfb4eof_irq,
+ csi_idmac_nfb4eof_interrupt, 0,
+ "imx-smfc-nfb4eof", priv);
+ if (ret) {
+ v4l2_err(&priv->sd,
+ "Error registering NFB4EOF irq: %d\n", ret);
+ goto out_unsetup;
+ }
+
+ priv->eof_irq = ipu_idmac_channel_irq(priv->ipu, priv->idmac_ch,
+ IPU_IRQ_EOF);
+
+ ret = devm_request_irq(priv->dev, priv->eof_irq,
+ csi_idmac_eof_interrupt, 0,
+ "imx-smfc-eof", priv);
+ if (ret) {
+ v4l2_err(&priv->sd,
+ "Error registering eof irq: %d\n", ret);
+ goto out_free_nfb4eof_irq;
+ }
+
+ /* start the EOF timeout timer */
+ mod_timer(&priv->eof_timeout_timer,
+ jiffies + msecs_to_jiffies(IMX_MEDIA_EOF_TIMEOUT));
+
+ return 0;
+
+out_free_nfb4eof_irq:
+ devm_free_irq(priv->dev, priv->nfb4eof_irq, priv);
+out_unsetup:
+ csi_idmac_unsetup(priv);
+out_free_dma_buf:
+ imx_media_free_dma_buf(priv->md, &priv->underrun_buf);
+out_put_ipu:
+ csi_idmac_put_ipu_resources(priv);
+ return ret;
+}
+
+static void csi_idmac_stop(struct csi_priv *priv)
+{
+ unsigned long flags;
+ int ret;
+
+ /* mark next EOF interrupt as the last before stream off */
+ spin_lock_irqsave(&priv->irqlock, flags);
+ priv->last_eof = true;
+ spin_unlock_irqrestore(&priv->irqlock, flags);
+
+ /*
+ * and then wait for interrupt handler to mark completion.
+ */
+ ret = wait_for_completion_timeout(
+ &priv->last_eof_comp, msecs_to_jiffies(IMX_MEDIA_EOF_TIMEOUT));
+ if (ret == 0)
+ v4l2_warn(&priv->sd, "wait last EOF timeout\n");
+
+ devm_free_irq(priv->dev, priv->eof_irq, priv);
+ devm_free_irq(priv->dev, priv->nfb4eof_irq, priv);
+
+ csi_idmac_unsetup(priv);
+
+ imx_media_free_dma_buf(priv->md, &priv->underrun_buf);
+
+ /* cancel the EOF timeout timer */
+ del_timer_sync(&priv->eof_timeout_timer);
+
+ csi_idmac_put_ipu_resources(priv);
+}
+
+/* Update the CSI whole sensor and active windows */
+static int csi_setup(struct csi_priv *priv)
+{
+ struct v4l2_mbus_framefmt *infmt, *outfmt;
+ struct v4l2_mbus_config sensor_mbus_cfg;
+ struct v4l2_of_endpoint *sensor_ep;
+ struct v4l2_mbus_framefmt if_fmt;
+
+ infmt = &priv->format_mbus[CSI_SINK_PAD];
+ outfmt = &priv->format_mbus[priv->active_output_pad];
+ sensor_ep = &priv->sensor->sensor_ep;
+
+ /* compose mbus_config from sensor endpoint */
+ sensor_mbus_cfg.type = sensor_ep->bus_type;
+ sensor_mbus_cfg.flags = (sensor_ep->bus_type == V4L2_MBUS_CSI2) ?
+ sensor_ep->bus.mipi_csi2.flags :
+ sensor_ep->bus.parallel.flags;
+
+ /*
+ * we need to pass input sensor frame to CSI interface, but
+ * with translated field type from output format
+ */
+ if_fmt = *infmt;
+ if_fmt.field = outfmt->field;
+
+ ipu_csi_set_window(priv->csi, &priv->crop);
+
+ ipu_csi_init_interface(priv->csi, &sensor_mbus_cfg, &if_fmt);
+
+ ipu_csi_set_dest(priv->csi, priv->dest);
+
+ ipu_csi_dump(priv->csi);
+
+ return 0;
+}
+
+static int csi_start(struct csi_priv *priv)
+{
+ int ret;
+
+ if (!priv->sensor) {
+ v4l2_err(&priv->sd, "no sensor attached\n");
+ return -EINVAL;
+ }
+
+ if (priv->dest == IPU_CSI_DEST_IDMAC) {
+ ret = csi_idmac_start(priv);
+ if (ret)
+ return ret;
+ }
+
+ ret = csi_setup(priv);
+ if (ret)
+ goto idmac_stop;
+
+ /* start the frame interval monitor */
+ if (priv->fim) {
+ ret = imx_media_fim_set_stream(priv->fim, priv->sensor, true);
+ if (ret)
+ goto idmac_stop;
+ }
+
+ ret = ipu_csi_enable(priv->csi);
+ if (ret) {
+ v4l2_err(&priv->sd, "CSI enable error: %d\n", ret);
+ goto fim_off;
+ }
+
+ return 0;
+
+fim_off:
+ if (priv->fim)
+ imx_media_fim_set_stream(priv->fim, priv->sensor, false);
+idmac_stop:
+ if (priv->dest == IPU_CSI_DEST_IDMAC)
+ csi_idmac_stop(priv);
+ return ret;
+}
+
+static void csi_stop(struct csi_priv *priv)
+{
+ if (priv->dest == IPU_CSI_DEST_IDMAC)
+ csi_idmac_stop(priv);
+
+ /* stop the frame interval monitor */
+ if (priv->fim)
+ imx_media_fim_set_stream(priv->fim, priv->sensor, false);
+
+ ipu_csi_disable(priv->csi);
+}
+
+static int csi_s_stream(struct v4l2_subdev *sd, int enable)
+{
+ struct csi_priv *priv = v4l2_get_subdevdata(sd);
+ int ret = 0;
+
+ if (!priv->src_sd || !priv->sink)
+ return -EPIPE;
+
+ dev_dbg(priv->dev, "stream %s\n", enable ? "ON" : "OFF");
+
+ if (enable && !priv->stream_on)
+ ret = csi_start(priv);
+ else if (!enable && priv->stream_on)
+ csi_stop(priv);
+
+ if (!ret)
+ priv->stream_on = enable;
+ return ret;
+}
+
+static int csi_s_power(struct v4l2_subdev *sd, int on)
+{
+ struct csi_priv *priv = v4l2_get_subdevdata(sd);
+ int ret = 0;
+
+ dev_dbg(priv->dev, "power %s\n", on ? "ON" : "OFF");
+
+ if (priv->fim && on != priv->power_on)
+ ret = imx_media_fim_set_power(priv->fim, on);
+
+ if (!ret)
+ priv->power_on = on;
+ return ret;
+}
+
+static int csi_link_setup(struct media_entity *entity,
+ const struct media_pad *local,
+ const struct media_pad *remote, u32 flags)
+{
+ struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
+ struct csi_priv *priv = v4l2_get_subdevdata(sd);
+ struct imx_media_video_dev *vdev = priv->vdev;
+ struct v4l2_subdev *remote_sd;
+ int ret;
+
+ dev_dbg(priv->dev, "link setup %s -> %s", remote->entity->name,
+ local->entity->name);
+
+ if (local->flags & MEDIA_PAD_FL_SINK) {
+ if (!is_media_entity_v4l2_subdev(remote->entity))
+ return -EINVAL;
+
+ remote_sd = media_entity_to_v4l2_subdev(remote->entity);
+
+ if (flags & MEDIA_LNK_FL_ENABLED) {
+ if (priv->src_sd)
+ return -EBUSY;
+ priv->src_sd = remote_sd;
+ } else {
+ priv->src_sd = NULL;
+ }
+
+ return 0;
+ }
+
+ /* this is a source pad */
+
+ if (flags & MEDIA_LNK_FL_ENABLED) {
+ if (priv->sink)
+ return -EBUSY;
+ } else {
+ /* reset video device controls */
+ v4l2_ctrl_handler_free(vdev->vfd->ctrl_handler);
+ v4l2_ctrl_handler_init(vdev->vfd->ctrl_handler, 0);
+
+ priv->sink = NULL;
+ return 0;
+ }
+
+ /* record which output pad is now active */
+ priv->active_output_pad = local->index;
+
+ /* set CSI destination */
+ if (local->index == CSI_SRC_PAD_IDMAC) {
+ if (!is_media_entity_v4l2_video_device(remote->entity))
+ return -EINVAL;
+
+ /* reset video device controls to refresh from subdevs */
+ v4l2_ctrl_handler_free(vdev->vfd->ctrl_handler);
+ v4l2_ctrl_handler_init(vdev->vfd->ctrl_handler, 0);
+
+ ret = __v4l2_pipeline_inherit_controls(vdev->vfd,
+ &priv->sd.entity);
+ if (ret)
+ return ret;
+
+ priv->dest = IPU_CSI_DEST_IDMAC;
+ } else {
+ if (!is_media_entity_v4l2_subdev(remote->entity))
+ return -EINVAL;
+
+ remote_sd = media_entity_to_v4l2_subdev(remote->entity);
+ switch (remote_sd->grp_id) {
+ case IMX_MEDIA_GRP_ID_VDIC:
+ priv->dest = IPU_CSI_DEST_VDIC;
+ break;
+ case IMX_MEDIA_GRP_ID_IC_PRP:
+ priv->dest = IPU_CSI_DEST_IC;
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
+
+ priv->sink = remote->entity;
+
+ return 0;
+}
+
+static int csi_link_validate(struct v4l2_subdev *sd,
+ struct media_link *link,
+ struct v4l2_subdev_format *source_fmt,
+ struct v4l2_subdev_format *sink_fmt)
+{
+ struct csi_priv *priv = v4l2_get_subdevdata(sd);
+ struct v4l2_of_endpoint *sensor_ep;
+ bool is_csi2;
+ int ret;
+
+ ret = v4l2_subdev_link_validate_default(sd, link,
+ source_fmt, sink_fmt);
+ if (ret)
+ return ret;
+
+ priv->sensor = __imx_media_find_sensor(priv->md, &priv->sd.entity);
+ if (IS_ERR(priv->sensor)) {
+ v4l2_err(&priv->sd, "no sensor attached\n");
+ ret = PTR_ERR(priv->sensor);
+ priv->sensor = NULL;
+ return ret;
+ }
+
+ sensor_ep = &priv->sensor->sensor_ep;
+
+ is_csi2 = (sensor_ep->bus_type == V4L2_MBUS_CSI2);
+
+ if (is_csi2) {
+ int vc_num = 0;
+ /*
+ * NOTE! It seems the virtual channels from the mipi csi-2
+ * receiver are used only for routing by the video mux's,
+ * or for hard-wired routing to the CSI's. Once the stream
+ * enters the CSI's however, they are treated internally
+ * in the IPU as virtual channel 0.
+ */
+#if 0
+ vc_num = imx_media_find_mipi_csi2_channel(priv->md,
+ &priv->sd.entity);
+ if (vc_num < 0)
+ return vc_num;
+#endif
+ ipu_csi_set_mipi_datatype(priv->csi, vc_num,
+ &priv->format_mbus[CSI_SINK_PAD]);
+ }
+
+ /* select either parallel or MIPI-CSI2 as input to CSI */
+ ipu_set_csi_src_mux(priv->ipu, priv->csi_id, is_csi2);
+
+ return 0;
+}
+
+static int csi_eof_isr(struct v4l2_subdev *sd, u32 status, bool *handled)
+{
+ struct csi_priv *priv = v4l2_get_subdevdata(sd);
+
+ csi_call_fim(priv);
+
+ return 0;
+}
+
+static int csi_try_crop(struct csi_priv *priv, struct v4l2_rect *crop,
+ struct imx_media_subdev *sensor)
+{
+ struct v4l2_of_endpoint *sensor_ep;
+ struct v4l2_mbus_framefmt *infmt;
+ v4l2_std_id std;
+ int ret;
+
+ infmt = &priv->format_mbus[CSI_SINK_PAD];
+ sensor_ep = &sensor->sensor_ep;
+
+ crop->width = min_t(__u32, infmt->width, crop->width);
+ if (crop->left + crop->width > infmt->width)
+ crop->left = infmt->width - crop->width;
+ /* adjust crop left/width to h/w alignment restrictions */
+ crop->left &= ~0x3;
+ crop->width &= ~0x7;
+
+ /*
+ * FIXME: not sure why yet, but on interlaced bt.656,
+ * changing the vertical cropping causes loss of vertical
+ * sync, so fix it to NTSC/PAL active lines. NTSC contains
+ * 2 extra lines of active video that need to be cropped.
+ */
+ if (sensor_ep->bus_type == V4L2_MBUS_BT656) {
+ ret = v4l2_subdev_call(sensor->sd, video, g_std, &std);
+ if (ret)
+ return ret;
+ if (std & V4L2_STD_525_60) {
+ crop->top = 2;
+ crop->height = 480;
+ } else {
+ crop->top = 0;
+ crop->height = 576;
+ }
+ } else {
+ crop->height = min_t(__u32, infmt->height, crop->height);
+ if (crop->top + crop->height > infmt->height)
+ crop->top = infmt->height - crop->height;
+ }
+
+ return 0;
+}
+
+static int csi_enum_mbus_code(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg,
+ struct v4l2_subdev_mbus_code_enum *code)
+{
+ if (code->pad >= CSI_NUM_PADS)
+ return -EINVAL;
+
+ if (code->pad == CSI_SRC_PAD_DIRECT)
+ return imx_media_enum_ipu_format(NULL, &code->code,
+ code->index, true);
+
+ return imx_media_enum_format(NULL, &code->code, code->index,
+ true, false);
+}
+
+static int csi_get_fmt(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg,
+ struct v4l2_subdev_format *sdformat)
+{
+ struct csi_priv *priv = v4l2_get_subdevdata(sd);
+
+ if (sdformat->pad >= CSI_NUM_PADS)
+ return -EINVAL;
+
+ sdformat->format = priv->format_mbus[sdformat->pad];
+
+ return 0;
+}
+
+static int csi_set_fmt(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg,
+ struct v4l2_subdev_format *sdformat)
+{
+ struct csi_priv *priv = v4l2_get_subdevdata(sd);
+ const struct imx_media_pixfmt *cc, *incc;
+ struct v4l2_mbus_framefmt *infmt;
+ struct imx_media_subdev *sensor;
+ struct v4l2_rect crop;
+ u32 code;
+ int ret;
+
+ if (sdformat->pad >= CSI_NUM_PADS)
+ return -EINVAL;
+
+ if (priv->stream_on)
+ return -EBUSY;
+
+ infmt = &priv->format_mbus[CSI_SINK_PAD];
+
+ sensor = imx_media_find_sensor(priv->md, &priv->sd.entity);
+ if (IS_ERR(sensor)) {
+ v4l2_err(&priv->sd, "no sensor attached\n");
+ return PTR_ERR(sensor);
+ }
+
+ v4l_bound_align_image(&sdformat->format.width, MIN_W, MAX_W,
+ W_ALIGN, &sdformat->format.height,
+ MIN_H, MAX_H, H_ALIGN, S_ALIGN);
+
+ switch (sdformat->pad) {
+ case CSI_SRC_PAD_DIRECT:
+ case CSI_SRC_PAD_IDMAC:
+ crop.left = priv->crop.left;
+ crop.top = priv->crop.top;
+ crop.width = sdformat->format.width;
+ crop.height = sdformat->format.height;
+ ret = csi_try_crop(priv, &crop, sensor);
+ if (ret)
+ return ret;
+ sdformat->format.width = crop.width;
+ sdformat->format.height = crop.height;
+
+ if (sdformat->pad == CSI_SRC_PAD_IDMAC) {
+ cc = imx_media_find_format(0, sdformat->format.code,
+ true, false);
+ if (!cc) {
+ imx_media_enum_format(NULL, &code, 0,
+ true, false);
+ cc = imx_media_find_format(0, code,
+ true, false);
+ sdformat->format.code = cc->codes[0];
+ }
+
+ incc = priv->cc[CSI_SINK_PAD];
+ if (cc->cs != incc->cs) {
+ sdformat->format.code = infmt->code;
+ cc = imx_media_find_format(
+ 0, sdformat->format.code,
+ true, false);
+ }
+
+ if (sdformat->format.field != V4L2_FIELD_NONE)
+ sdformat->format.field = infmt->field;
+ } else {
+ cc = imx_media_find_ipu_format(0, sdformat->format.code,
+ true);
+ if (!cc) {
+ imx_media_enum_ipu_format(NULL, &code, 0, true);
+ cc = imx_media_find_ipu_format(0, code, true);
+ sdformat->format.code = cc->codes[0];
+ }
+
+ sdformat->format.field = infmt->field;
+ }
+
+ /*
+ * translate V4L2_FIELD_ALTERNATE to SEQ_TB or SEQ_BT
+ * depending on video standard from sensor
+ */
+ if (sdformat->format.field == V4L2_FIELD_ALTERNATE) {
+ v4l2_std_id std;
+
+ ret = v4l2_subdev_call(sensor->sd, video, g_std, &std);
+ if (ret)
+ return ret;
+ sdformat->format.field = (std & V4L2_STD_525_60) ?
+ V4L2_FIELD_SEQ_TB : V4L2_FIELD_SEQ_BT;
+ }
+ break;
+ case CSI_SINK_PAD:
+ cc = imx_media_find_format(0, sdformat->format.code,
+ true, false);
+ if (!cc) {
+ imx_media_enum_format(NULL, &code, 0, true, false);
+ cc = imx_media_find_format(0, code, true, false);
+ sdformat->format.code = cc->codes[0];
+ }
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (sdformat->which == V4L2_SUBDEV_FORMAT_TRY) {
+ cfg->try_fmt = sdformat->format;
+ } else {
+ priv->format_mbus[sdformat->pad] = sdformat->format;
+ priv->cc[sdformat->pad] = cc;
+ /* Update the crop window if this is an output pad */
+ if (sdformat->pad == CSI_SRC_PAD_DIRECT ||
+ sdformat->pad == CSI_SRC_PAD_IDMAC)
+ priv->crop = crop;
+ }
+
+ return 0;
+}
+
+static int csi_get_selection(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg,
+ struct v4l2_subdev_selection *sel)
+{
+ struct csi_priv *priv = v4l2_get_subdevdata(sd);
+ struct v4l2_mbus_framefmt *infmt;
+
+ if (sel->pad >= CSI_NUM_PADS || sel->pad == CSI_SINK_PAD)
+ return -EINVAL;
+
+ infmt = &priv->format_mbus[CSI_SINK_PAD];
+
+ switch (sel->target) {
+ case V4L2_SEL_TGT_CROP_BOUNDS:
+ sel->r.left = 0;
+ sel->r.top = 0;
+ sel->r.width = infmt->width;
+ sel->r.height = infmt->height;
+ break;
+ case V4L2_SEL_TGT_CROP:
+ sel->r = priv->crop;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int csi_set_selection(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg,
+ struct v4l2_subdev_selection *sel)
+{
+ struct csi_priv *priv = v4l2_get_subdevdata(sd);
+ struct v4l2_mbus_framefmt *outfmt;
+ struct imx_media_subdev *sensor;
+ int ret;
+
+ if (sel->pad >= CSI_NUM_PADS ||
+ sel->pad == CSI_SINK_PAD ||
+ sel->target != V4L2_SEL_TGT_CROP)
+ return -EINVAL;
+
+ if (priv->stream_on)
+ return -EBUSY;
+
+ sensor = imx_media_find_sensor(priv->md, &priv->sd.entity);
+ if (IS_ERR(sensor)) {
+ v4l2_err(&priv->sd, "no sensor attached\n");
+ return PTR_ERR(sensor);
+ }
+
+ /*
+ * Modifying the crop rectangle always changes the format on the source
+ * pad. If the KEEP_CONFIG flag is set, just return the current crop
+ * rectangle.
+ */
+ if (sel->flags & V4L2_SEL_FLAG_KEEP_CONFIG) {
+ sel->r = priv->crop;
+ if (sel->which == V4L2_SUBDEV_FORMAT_TRY)
+ cfg->try_crop = sel->r;
+ return 0;
+ }
+
+ outfmt = &priv->format_mbus[sel->pad];
+
+ ret = csi_try_crop(priv, &sel->r, sensor);
+ if (ret)
+ return ret;
+
+ if (sel->which == V4L2_SUBDEV_FORMAT_TRY) {
+ cfg->try_crop = sel->r;
+ } else {
+ priv->crop = sel->r;
+ /* Update the source format */
+ outfmt->width = sel->r.width;
+ outfmt->height = sel->r.height;
+ }
+
+ return 0;
+}
+
+/*
+ * retrieve our pads parsed from the OF graph by the media device
+ */
+static int csi_registered(struct v4l2_subdev *sd)
+{
+ struct csi_priv *priv = v4l2_get_subdevdata(sd);
+ int i, ret;
+ u32 code;
+
+ /* get media device */
+ priv->md = dev_get_drvdata(sd->v4l2_dev->dev);
+
+ /* get handle to IPU CSI */
+ priv->csi = ipu_csi_get(priv->ipu, priv->csi_id);
+ if (IS_ERR(priv->csi)) {
+ v4l2_err(&priv->sd, "failed to get CSI%d\n", priv->csi_id);
+ return PTR_ERR(priv->csi);
+ }
+
+ for (i = 0; i < CSI_NUM_PADS; i++) {
+ priv->pad[i].flags = (i == CSI_SINK_PAD) ?
+ MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE;
+
+ code = 0;
+ if (i == CSI_SRC_PAD_DIRECT)
+ imx_media_enum_ipu_format(NULL, &code, 0, true);
+
+ /* set a default mbus format */
+ ret = imx_media_init_mbus_fmt(&priv->format_mbus[i],
+ 640, 480, code, V4L2_FIELD_NONE,
+ &priv->cc[i]);
+ if (ret)
+ goto put_csi;
+ }
+
+ priv->fim = imx_media_fim_init(&priv->sd);
+ if (IS_ERR(priv->fim)) {
+ ret = PTR_ERR(priv->fim);
+ goto put_csi;
+ }
+
+ ret = media_entity_pads_init(&sd->entity, CSI_NUM_PADS, priv->pad);
+ if (ret)
+ goto free_fim;
+
+ ret = imx_media_capture_device_register(priv->vdev);
+ if (ret)
+ goto free_fim;
+
+ return 0;
+
+free_fim:
+ if (priv->fim)
+ imx_media_fim_free(priv->fim);
+put_csi:
+ ipu_csi_put(priv->csi);
+ return ret;
+}
+
+static void csi_unregistered(struct v4l2_subdev *sd)
+{
+ struct csi_priv *priv = v4l2_get_subdevdata(sd);
+
+ imx_media_capture_device_unregister(priv->vdev);
+
+ if (priv->fim)
+ imx_media_fim_free(priv->fim);
+
+ if (!IS_ERR_OR_NULL(priv->csi))
+ ipu_csi_put(priv->csi);
+}
+
+static struct media_entity_operations csi_entity_ops = {
+ .link_setup = csi_link_setup,
+ .link_validate = v4l2_subdev_link_validate,
+};
+
+static struct v4l2_subdev_core_ops csi_core_ops = {
+ .s_power = csi_s_power,
+ .interrupt_service_routine = csi_eof_isr,
+};
+
+static struct v4l2_subdev_video_ops csi_video_ops = {
+ .s_stream = csi_s_stream,
+};
+
+static struct v4l2_subdev_pad_ops csi_pad_ops = {
+ .enum_mbus_code = csi_enum_mbus_code,
+ .get_fmt = csi_get_fmt,
+ .set_fmt = csi_set_fmt,
+ .get_selection = csi_get_selection,
+ .set_selection = csi_set_selection,
+ .link_validate = csi_link_validate,
+};
+
+static struct v4l2_subdev_ops csi_subdev_ops = {
+ .core = &csi_core_ops,
+ .video = &csi_video_ops,
+ .pad = &csi_pad_ops,
+};
+
+static struct v4l2_subdev_internal_ops csi_internal_ops = {
+ .registered = csi_registered,
+ .unregistered = csi_unregistered,
+};
+
+static int imx_csi_probe(struct platform_device *pdev)
+{
+ struct ipu_client_platformdata *pdata;
+ struct csi_priv *priv;
+ int ret;
+
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, &priv->sd);
+ priv->dev = &pdev->dev;
+
+ ret = dma_set_coherent_mask(priv->dev, DMA_BIT_MASK(32));
+ if (ret)
+ return ret;
+
+ /* get parent IPU */
+ priv->ipu = dev_get_drvdata(priv->dev->parent);
+
+ /* get our CSI id */
+ pdata = priv->dev->platform_data;
+ priv->csi_id = pdata->csi;
+ priv->smfc_id = (priv->csi_id == 0) ? 0 : 2;
+
+ init_timer(&priv->eof_timeout_timer);
+ priv->eof_timeout_timer.data = (unsigned long)priv;
+ priv->eof_timeout_timer.function = csi_idmac_eof_timeout;
+ spin_lock_init(&priv->irqlock);
+
+ v4l2_subdev_init(&priv->sd, &csi_subdev_ops);
+ v4l2_set_subdevdata(&priv->sd, priv);
+ priv->sd.internal_ops = &csi_internal_ops;
+ priv->sd.entity.ops = &csi_entity_ops;
+ priv->sd.entity.function = MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER;
+ priv->sd.dev = &pdev->dev;
+ priv->sd.owner = THIS_MODULE;
+ priv->sd.flags = V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS;
+ priv->sd.grp_id = priv->csi_id ?
+ IMX_MEDIA_GRP_ID_CSI1 : IMX_MEDIA_GRP_ID_CSI0;
+ imx_media_grp_id_to_sd_name(priv->sd.name, sizeof(priv->sd.name),
+ priv->sd.grp_id, ipu_get_num(priv->ipu));
+
+ priv->vdev = imx_media_capture_device_init(&priv->sd,
+ CSI_SRC_PAD_IDMAC);
+ if (IS_ERR(priv->vdev))
+ return PTR_ERR(priv->vdev);
+
+ v4l2_ctrl_handler_init(&priv->ctrl_hdlr, 0);
+ priv->sd.ctrl_handler = &priv->ctrl_hdlr;
+
+ ret = v4l2_async_register_subdev(&priv->sd);
+ if (ret)
+ v4l2_ctrl_handler_free(&priv->ctrl_hdlr);
+
+ return ret;
+}
+
+static int imx_csi_remove(struct platform_device *pdev)
+{
+ struct v4l2_subdev *sd = platform_get_drvdata(pdev);
+ struct csi_priv *priv = sd_to_dev(sd);
+
+ imx_media_capture_device_remove(priv->vdev);
+ v4l2_async_unregister_subdev(sd);
+ media_entity_cleanup(&sd->entity);
+
+ return 0;
+}
+
+static const struct platform_device_id imx_csi_ids[] = {
+ { .name = "imx-ipuv3-csi" },
+ { },
+};
+MODULE_DEVICE_TABLE(platform, imx_csi_ids);
+
+static struct platform_driver imx_csi_driver = {
+ .probe = imx_csi_probe,
+ .remove = imx_csi_remove,
+ .id_table = imx_csi_ids,
+ .driver = {
+ .name = "imx-ipuv3-csi",
+ },
+};
+module_platform_driver(imx_csi_driver);
+
+MODULE_DESCRIPTION("i.MX CSI subdev driver");
+MODULE_AUTHOR("Steve Longerbeam <steve_longerbeam@mentor.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:imx-ipuv3-csi");
--
2.7.4