[PATCH v2 2/9] media: Add Chameleon v3 framebuffer driver
From: Paweł Anikiel
Date: Wed Feb 21 2024 - 11:04:02 EST
Add v4l2 driver for the Google Chameleon v3 framebuffer device.
Signed-off-by: Paweł Anikiel <panikiel@xxxxxxxxxx>
---
drivers/media/platform/Kconfig | 1 +
drivers/media/platform/Makefile | 1 +
drivers/media/platform/google/Kconfig | 3 +
drivers/media/platform/google/Makefile | 2 +
.../media/platform/google/chameleonv3/Kconfig | 13 +
.../platform/google/chameleonv3/Makefile | 3 +
.../platform/google/chameleonv3/chv3-fb.c | 895 ++++++++++++++++++
7 files changed, 918 insertions(+)
create mode 100644 drivers/media/platform/google/Kconfig
create mode 100644 drivers/media/platform/google/Makefile
create mode 100644 drivers/media/platform/google/chameleonv3/Kconfig
create mode 100644 drivers/media/platform/google/chameleonv3/Makefile
create mode 100644 drivers/media/platform/google/chameleonv3/chv3-fb.c
diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
index 91e54215de3a..b82f7b142b85 100644
--- a/drivers/media/platform/Kconfig
+++ b/drivers/media/platform/Kconfig
@@ -69,6 +69,7 @@ source "drivers/media/platform/aspeed/Kconfig"
source "drivers/media/platform/atmel/Kconfig"
source "drivers/media/platform/cadence/Kconfig"
source "drivers/media/platform/chips-media/Kconfig"
+source "drivers/media/platform/google/Kconfig"
source "drivers/media/platform/intel/Kconfig"
source "drivers/media/platform/marvell/Kconfig"
source "drivers/media/platform/mediatek/Kconfig"
diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
index 3296ec1ebe16..f7067eb05f76 100644
--- a/drivers/media/platform/Makefile
+++ b/drivers/media/platform/Makefile
@@ -12,6 +12,7 @@ obj-y += aspeed/
obj-y += atmel/
obj-y += cadence/
obj-y += chips-media/
+obj-y += google/
obj-y += intel/
obj-y += marvell/
obj-y += mediatek/
diff --git a/drivers/media/platform/google/Kconfig b/drivers/media/platform/google/Kconfig
new file mode 100644
index 000000000000..2a5f01034c11
--- /dev/null
+++ b/drivers/media/platform/google/Kconfig
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+source "drivers/media/platform/google/chameleonv3/Kconfig"
diff --git a/drivers/media/platform/google/Makefile b/drivers/media/platform/google/Makefile
new file mode 100644
index 000000000000..c971a09faeb4
--- /dev/null
+++ b/drivers/media/platform/google/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-y += chameleonv3/
diff --git a/drivers/media/platform/google/chameleonv3/Kconfig b/drivers/media/platform/google/chameleonv3/Kconfig
new file mode 100644
index 000000000000..76d0383a8589
--- /dev/null
+++ b/drivers/media/platform/google/chameleonv3/Kconfig
@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+config VIDEO_CHV3_FB
+ tristate "Google Chameleon v3 framebuffer video driver"
+ depends on V4L_PLATFORM_DRIVERS
+ depends on VIDEO_DEV
+ select VIDEOBUF2_DMA_CONTIG
+ select V4L2_FWNODE
+ help
+ v4l2 driver for the video interface present on the Google
+ Chameleon v3. The Chameleon v3 uses the framebuffer IP core
+ to take the video signal from different sources and directly
+ write frames into memory.
diff --git a/drivers/media/platform/google/chameleonv3/Makefile b/drivers/media/platform/google/chameleonv3/Makefile
new file mode 100644
index 000000000000..d63727148688
--- /dev/null
+++ b/drivers/media/platform/google/chameleonv3/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+obj-$(CONFIG_VIDEO_CHV3_FB) += chv3-fb.o
diff --git a/drivers/media/platform/google/chameleonv3/chv3-fb.c b/drivers/media/platform/google/chameleonv3/chv3-fb.c
new file mode 100644
index 000000000000..35a44365eba0
--- /dev/null
+++ b/drivers/media/platform/google/chameleonv3/chv3-fb.c
@@ -0,0 +1,895 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2023-2024 Google LLC.
+ * Author: Paweł Anikiel <panikiel@xxxxxxxxxx>
+ */
+
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/videodev2.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-dv-timings.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-fwnode.h>
+#include <media/v4l2-ioctl.h>
+#include <media/videobuf2-dma-contig.h>
+
+#define DEVICE_NAME "chv3-fb"
+
+/*
+ * The device is expected to report some format even if there's currently no
+ * active video stream. In such case we default to 1080p.
+ */
+#define DEFAULT_WIDTH 1920
+#define DEFAULT_HEIGHT 1080
+
+#define FB_EN 0x00
+#define FB_EN_BIT BIT(0)
+#define FB_HEIGHT 0x04
+#define FB_WIDTH 0x08
+#define FB_BUFFERA 0x0c
+#define FB_BUFFERB 0x10
+#define FB_BUFFERSIZE 0x14
+#define FB_RESET 0x18
+#define FB_RESET_BIT BIT(0)
+#define FB_ERRORSTATUS 0x1c
+#define FB_IOCOLOR 0x20
+#define FB_DATARATE 0x24
+#define FB_DATARATE_SINGLE 0x0
+#define FB_DATARATE_DOUBLE 0x1
+#define FB_PIXELMODE 0x28
+#define FB_PIXELMODE_SINGLE 0x0
+#define FB_PIXELMODE_DOUBLE 0x1
+#define FB_SYNCPOLARITY 0x2c
+#define FB_DMAFORMAT 0x30
+#define FB_DMAFORMAT_8BPC 0x0
+#define FB_DMAFORMAT_10BPC_UPPER 0x1
+#define FB_DMAFORMAT_10BPC_LOWER 0x2
+#define FB_DMAFORMAT_12BPC_UPPER 0x3
+#define FB_DMAFORMAT_12BPC_LOWER 0x4
+#define FB_DMAFORMAT_16BPC 0x5
+#define FB_DMAFORMAT_RAW 0x6
+#define FB_DMAFORMAT_8BPC_LEGACY 0x7
+#define FB_VERSION 0x34
+#define FB_VERSION_CURRENT 0xc0fb0001
+
+#define FB_IRQ_MASK 0x8
+#define FB_IRQ_CLR 0xc
+#define FB_IRQ_ALL 0xf
+#define FB_IRQ_BUFF0 BIT(0)
+#define FB_IRQ_BUFF1 BIT(1)
+#define FB_IRQ_RESOLUTION BIT(2)
+#define FB_IRQ_ERROR BIT(3)
+
+struct chv3_fb {
+ struct device *dev;
+ void __iomem *iobase;
+ void __iomem *iobase_irq;
+
+ struct v4l2_device v4l2_dev;
+ struct vb2_queue queue;
+ struct video_device vdev;
+ struct v4l2_pix_format pix_fmt;
+ struct v4l2_dv_timings timings;
+
+ struct v4l2_async_notifier notifier;
+ struct v4l2_subdev *subdev;
+ int subdev_source_pad;
+
+ u32 sequence;
+ bool writing_to_a;
+
+ struct list_head bufs;
+ spinlock_t bufs_lock;
+
+ struct mutex fb_lock;
+};
+
+struct chv3_fb_buffer {
+ struct vb2_v4l2_buffer vb;
+ struct list_head link;
+};
+
+static void chv3_fb_set_format_resolution(struct chv3_fb *fb, u32 width, u32 height)
+{
+ u32 bytes_per_pixel;
+
+ if (fb->pix_fmt.pixelformat == V4L2_PIX_FMT_RGB24)
+ bytes_per_pixel = 3;
+ else
+ bytes_per_pixel = 4;
+
+ fb->pix_fmt.width = width;
+ fb->pix_fmt.height = height;
+ fb->pix_fmt.bytesperline = width * bytes_per_pixel;
+ fb->pix_fmt.sizeimage = fb->pix_fmt.bytesperline * height;
+}
+
+/*
+ * The video interface has hardware counters which expose the width and
+ * height of the current video stream. It can't reliably detect if the stream
+ * is present or not, so this is only used as a fallback in the case where
+ * we don't have access to the receiver hardware.
+ */
+static int chv3_fb_query_dv_timings_fallback(struct chv3_fb *fb,
+ struct v4l2_dv_timings *timings)
+{
+ u32 width, height;
+
+ width = readl(fb->iobase + FB_WIDTH);
+ height = readl(fb->iobase + FB_HEIGHT);
+ if (width == 0 || height == 0)
+ return -ENOLINK;
+
+ memset(timings, 0, sizeof(*timings));
+ timings->type = V4L2_DV_BT_656_1120;
+ timings->bt.width = width;
+ timings->bt.height = height;
+
+ return 0;
+}
+
+static int chv3_fb_query_dv_timings(struct chv3_fb *fb, struct v4l2_dv_timings *timings)
+{
+ if (fb->subdev) {
+ return v4l2_subdev_call(fb->subdev, pad, query_dv_timings,
+ fb->subdev_source_pad, timings);
+ } else {
+ return chv3_fb_query_dv_timings_fallback(fb, timings);
+ }
+}
+
+static const struct v4l2_dv_timings_cap chv3_fb_fallback_dv_timings_cap = {
+ .type = V4L2_DV_BT_656_1120,
+ .bt = {
+ .min_width = 0,
+ .max_width = 65535,
+ .min_height = 0,
+ .max_height = 65535,
+ .min_pixelclock = 0,
+ .max_pixelclock = 2147483647,
+ .standards = V4L2_DV_BT_STD_CEA861 | V4L2_DV_BT_STD_DMT |
+ V4L2_DV_BT_STD_CVT | V4L2_DV_BT_STD_GTF,
+ .capabilities = V4L2_DV_BT_CAP_PROGRESSIVE |
+ V4L2_DV_BT_CAP_REDUCED_BLANKING |
+ V4L2_DV_BT_CAP_CUSTOM,
+ },
+};
+
+static int chv3_fb_enum_dv_timings_fallback(struct chv3_fb *fb,
+ struct v4l2_enum_dv_timings *timings)
+{
+ return v4l2_enum_dv_timings_cap(timings, &chv3_fb_fallback_dv_timings_cap,
+ NULL, NULL);
+}
+
+static int chv3_fb_dv_timings_cap_fallback(struct chv3_fb *fb,
+ struct v4l2_dv_timings_cap *cap)
+{
+ *cap = chv3_fb_fallback_dv_timings_cap;
+
+ return 0;
+}
+
+static void chv3_fb_apply_dv_timings(struct chv3_fb *fb)
+{
+ struct v4l2_dv_timings timings;
+ int res;
+
+ res = chv3_fb_query_dv_timings(fb, &timings);
+ if (res)
+ return;
+
+ fb->timings = timings;
+ chv3_fb_set_format_resolution(fb, timings.bt.width, timings.bt.height);
+}
+
+static int chv3_fb_querycap(struct file *file, void *fh,
+ struct v4l2_capability *cap)
+{
+ strscpy(cap->driver, DEVICE_NAME, sizeof(cap->driver));
+ strscpy(cap->card, "Chameleon v3 video", sizeof(cap->card));
+
+ return 0;
+}
+
+static int chv3_fb_g_fmt_vid_cap(struct file *file, void *fh,
+ struct v4l2_format *fmt)
+{
+ struct chv3_fb *fb = video_drvdata(file);
+
+ fmt->fmt.pix = fb->pix_fmt;
+
+ return 0;
+}
+
+static int chv3_fb_enum_fmt_vid_cap(struct file *file, void *fh,
+ struct v4l2_fmtdesc *fmt)
+{
+ struct chv3_fb *fb = video_drvdata(file);
+
+ if (fmt->index != 0)
+ return -EINVAL;
+
+ fmt->flags = 0;
+ fmt->pixelformat = fb->pix_fmt.pixelformat;
+
+ return 0;
+}
+
+static int chv3_fb_enum_framesizes(struct file *file, void *fh,
+ struct v4l2_frmsizeenum *frm)
+{
+ struct chv3_fb *fb = video_drvdata(file);
+
+ if (frm->index != 0)
+ return -EINVAL;
+
+ if (frm->pixel_format != fb->pix_fmt.pixelformat)
+ return -EINVAL;
+
+ frm->type = V4L2_FRMSIZE_TYPE_DISCRETE;
+ frm->discrete.width = fb->pix_fmt.width;
+ frm->discrete.height = fb->pix_fmt.height;
+
+ return 0;
+}
+
+static int chv3_fb_g_input(struct file *file, void *fh, unsigned int *index)
+{
+ *index = 0;
+
+ return 0;
+}
+
+static int chv3_fb_s_input(struct file *file, void *fh, unsigned int index)
+{
+ if (index != 0)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int chv3_fb_enum_input(struct file *file, void *fh,
+ struct v4l2_input *input)
+{
+ if (input->index != 0)
+ return -EINVAL;
+
+ strscpy(input->name, "input0", sizeof(input->name));
+ input->type = V4L2_INPUT_TYPE_CAMERA;
+ input->capabilities = V4L2_IN_CAP_DV_TIMINGS;
+
+ return 0;
+}
+
+static int chv3_fb_g_edid(struct file *file, void *fh,
+ struct v4l2_edid *edid)
+{
+ struct chv3_fb *fb = video_drvdata(file);
+ int res;
+
+ if (!fb->subdev)
+ return -ENOTTY;
+
+ if (edid->pad != 0)
+ return -EINVAL;
+
+ edid->pad = fb->subdev_source_pad;
+ res = v4l2_subdev_call(fb->subdev, pad, get_edid, edid);
+ edid->pad = 0;
+
+ return res;
+}
+
+static int chv3_fb_s_edid(struct file *file, void *fh,
+ struct v4l2_edid *edid)
+{
+ struct chv3_fb *fb = video_drvdata(file);
+ int res;
+
+ if (!fb->subdev)
+ return -ENOTTY;
+
+ if (edid->pad != 0)
+ return -EINVAL;
+
+ edid->pad = fb->subdev_source_pad;
+ res = v4l2_subdev_call(fb->subdev, pad, set_edid, edid);
+ edid->pad = 0;
+
+ return res;
+}
+
+static int chv3_fb_s_dv_timings(struct file *file, void *fh,
+ struct v4l2_dv_timings *timings)
+{
+ struct chv3_fb *fb = video_drvdata(file);
+
+ if (timings->bt.width == fb->timings.bt.width &&
+ timings->bt.height == fb->timings.bt.height)
+ return 0;
+
+ if (vb2_is_busy(&fb->queue))
+ return -EBUSY;
+
+ if (!v4l2_valid_dv_timings(timings, &chv3_fb_fallback_dv_timings_cap, NULL, NULL))
+ return -ERANGE;
+
+ fb->timings = *timings;
+ chv3_fb_set_format_resolution(fb, timings->bt.width, timings->bt.height);
+
+ return 0;
+}
+
+static int chv3_fb_g_dv_timings(struct file *file, void *fh,
+ struct v4l2_dv_timings *timings)
+{
+ struct chv3_fb *fb = video_drvdata(file);
+
+ *timings = fb->timings;
+ return 0;
+}
+
+static int chv3_fb_vidioc_query_dv_timings(struct file *file, void *fh,
+ struct v4l2_dv_timings *timings)
+{
+ struct chv3_fb *fb = video_drvdata(file);
+
+ return chv3_fb_query_dv_timings(fb, timings);
+}
+
+static int chv3_fb_enum_dv_timings(struct file *file, void *fh,
+ struct v4l2_enum_dv_timings *timings)
+{
+ struct chv3_fb *fb = video_drvdata(file);
+ int res;
+
+ if (timings->pad != 0)
+ return -EINVAL;
+
+ if (fb->subdev) {
+ timings->pad = fb->subdev_source_pad;
+ res = v4l2_subdev_call(fb->subdev, pad, enum_dv_timings, timings);
+ timings->pad = 0;
+ return res;
+ } else {
+ return chv3_fb_enum_dv_timings_fallback(fb, timings);
+ }
+}
+
+static int chv3_fb_dv_timings_cap(struct file *file, void *fh,
+ struct v4l2_dv_timings_cap *cap)
+{
+ struct chv3_fb *fb = video_drvdata(file);
+ int res;
+
+ if (cap->pad != 0)
+ return -EINVAL;
+
+ if (fb->subdev) {
+ cap->pad = fb->subdev_source_pad;
+ res = v4l2_subdev_call(fb->subdev, pad, dv_timings_cap, cap);
+ cap->pad = 0;
+ return res;
+ } else {
+ return chv3_fb_dv_timings_cap_fallback(fb, cap);
+ }
+}
+
+static int chv3_fb_subscribe_event(struct v4l2_fh *fh,
+ const struct v4l2_event_subscription *sub)
+{
+ switch (sub->type) {
+ case V4L2_EVENT_SOURCE_CHANGE:
+ return v4l2_src_change_event_subscribe(fh, sub);
+ }
+
+ return v4l2_ctrl_subscribe_event(fh, sub);
+}
+
+static const struct v4l2_ioctl_ops chv3_fb_v4l2_ioctl_ops = {
+ .vidioc_querycap = chv3_fb_querycap,
+
+ .vidioc_enum_fmt_vid_cap = chv3_fb_enum_fmt_vid_cap,
+ .vidioc_g_fmt_vid_cap = chv3_fb_g_fmt_vid_cap,
+ .vidioc_s_fmt_vid_cap = chv3_fb_g_fmt_vid_cap,
+ .vidioc_try_fmt_vid_cap = chv3_fb_g_fmt_vid_cap,
+
+ .vidioc_enum_framesizes = chv3_fb_enum_framesizes,
+
+ .vidioc_enum_input = chv3_fb_enum_input,
+ .vidioc_g_input = chv3_fb_g_input,
+ .vidioc_s_input = chv3_fb_s_input,
+ .vidioc_g_edid = chv3_fb_g_edid,
+ .vidioc_s_edid = chv3_fb_s_edid,
+
+ .vidioc_reqbufs = vb2_ioctl_reqbufs,
+ .vidioc_create_bufs = vb2_ioctl_create_bufs,
+ .vidioc_querybuf = vb2_ioctl_querybuf,
+ .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
+ .vidioc_expbuf = vb2_ioctl_expbuf,
+ .vidioc_qbuf = vb2_ioctl_qbuf,
+ .vidioc_dqbuf = vb2_ioctl_dqbuf,
+ .vidioc_streamon = vb2_ioctl_streamon,
+ .vidioc_streamoff = vb2_ioctl_streamoff,
+
+ .vidioc_s_dv_timings = chv3_fb_s_dv_timings,
+ .vidioc_g_dv_timings = chv3_fb_g_dv_timings,
+ .vidioc_query_dv_timings = chv3_fb_vidioc_query_dv_timings,
+ .vidioc_enum_dv_timings = chv3_fb_enum_dv_timings,
+ .vidioc_dv_timings_cap = chv3_fb_dv_timings_cap,
+
+ .vidioc_subscribe_event = chv3_fb_subscribe_event,
+ .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
+};
+
+static int chv3_fb_queue_setup(struct vb2_queue *q,
+ unsigned int *nbuffers, unsigned int *nplanes,
+ unsigned int sizes[], struct device *alloc_devs[])
+{
+ struct chv3_fb *fb = vb2_get_drv_priv(q);
+
+ if (*nplanes) {
+ if (sizes[0] < fb->pix_fmt.sizeimage)
+ return -EINVAL;
+ return 0;
+ }
+ *nplanes = 1;
+ sizes[0] = fb->pix_fmt.sizeimage;
+
+ return 0;
+}
+
+/*
+ * There are two address registers: BUFFERA and BUFFERB. The framebuffer
+ * alternates writing between them (i.e. even frames go to BUFFERA, odd
+ * ones to BUFFERB).
+ *
+ * (buffer queue) > QUEUED ---> QUEUED ---> QUEUED ---> ...
+ * BUFFERA BUFFERB
+ * (hw writing to this) ^
+ * (and then to this) ^
+ *
+ * The buffer swapping happens at irq time. When an irq comes, the next
+ * frame is already assigned an address in the buffer queue. This gives
+ * the irq handler a whole frame's worth of time to update the buffer
+ * address register.
+ */
+
+static dma_addr_t chv3_fb_buffer_dma_addr(struct chv3_fb_buffer *buf)
+{
+ return vb2_dma_contig_plane_dma_addr(&buf->vb.vb2_buf, 0);
+}
+
+static void chv3_fb_start_frame(struct chv3_fb *fb, struct chv3_fb_buffer *buf)
+{
+ fb->writing_to_a = 1;
+ writel(chv3_fb_buffer_dma_addr(buf), fb->iobase + FB_BUFFERA);
+ writel(FB_EN_BIT, fb->iobase + FB_EN);
+}
+
+static void chv3_fb_next_frame(struct chv3_fb *fb, struct chv3_fb_buffer *buf)
+{
+ u32 reg = fb->writing_to_a ? FB_BUFFERB : FB_BUFFERA;
+
+ writel(chv3_fb_buffer_dma_addr(buf), fb->iobase + reg);
+}
+
+static int chv3_fb_start_streaming(struct vb2_queue *q, unsigned int count)
+{
+ struct chv3_fb *fb = vb2_get_drv_priv(q);
+ struct chv3_fb_buffer *buf;
+ unsigned long flags;
+
+ fb->sequence = 0;
+ writel(fb->pix_fmt.sizeimage, fb->iobase + FB_BUFFERSIZE);
+
+ spin_lock_irqsave(&fb->bufs_lock, flags);
+ buf = list_first_entry_or_null(&fb->bufs, struct chv3_fb_buffer, link);
+ if (buf) {
+ chv3_fb_start_frame(fb, buf);
+ if (!list_is_last(&buf->link, &fb->bufs))
+ chv3_fb_next_frame(fb, list_next_entry(buf, link));
+ }
+ spin_unlock_irqrestore(&fb->bufs_lock, flags);
+
+ return 0;
+}
+
+static void chv3_fb_stop_streaming(struct vb2_queue *q)
+{
+ struct chv3_fb *fb = vb2_get_drv_priv(q);
+ struct chv3_fb_buffer *buf;
+ unsigned long flags;
+
+ writel(0, fb->iobase + FB_EN);
+
+ spin_lock_irqsave(&fb->bufs_lock, flags);
+ list_for_each_entry(buf, &fb->bufs, link)
+ vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
+ INIT_LIST_HEAD(&fb->bufs);
+ spin_unlock_irqrestore(&fb->bufs_lock, flags);
+}
+
+static void chv3_fb_buf_queue(struct vb2_buffer *vb)
+{
+ struct chv3_fb *fb = vb2_get_drv_priv(vb->vb2_queue);
+ struct vb2_v4l2_buffer *v4l2_buf = to_vb2_v4l2_buffer(vb);
+ struct chv3_fb_buffer *buf = container_of(v4l2_buf, struct chv3_fb_buffer, vb);
+ bool first, second;
+ unsigned long flags;
+
+ spin_lock_irqsave(&fb->bufs_lock, flags);
+ first = list_empty(&fb->bufs);
+ second = list_is_singular(&fb->bufs);
+ list_add_tail(&buf->link, &fb->bufs);
+ if (vb2_is_streaming(vb->vb2_queue)) {
+ if (first)
+ chv3_fb_start_frame(fb, buf);
+ else if (second)
+ chv3_fb_next_frame(fb, buf);
+ }
+ spin_unlock_irqrestore(&fb->bufs_lock, flags);
+}
+
+static const struct vb2_ops chv3_fb_vb2_ops = {
+ .queue_setup = chv3_fb_queue_setup,
+ .wait_prepare = vb2_ops_wait_prepare,
+ .wait_finish = vb2_ops_wait_finish,
+ .start_streaming = chv3_fb_start_streaming,
+ .stop_streaming = chv3_fb_stop_streaming,
+ .buf_queue = chv3_fb_buf_queue,
+};
+
+static int chv3_fb_open(struct file *file)
+{
+ struct chv3_fb *fb = video_drvdata(file);
+ int res;
+
+ mutex_lock(&fb->fb_lock);
+ res = v4l2_fh_open(file);
+ if (!res) {
+ if (v4l2_fh_is_singular_file(file))
+ chv3_fb_apply_dv_timings(fb);
+ }
+ mutex_unlock(&fb->fb_lock);
+
+ return res;
+}
+
+static const struct v4l2_file_operations chv3_fb_v4l2_fops = {
+ .owner = THIS_MODULE,
+ .open = chv3_fb_open,
+ .release = vb2_fop_release,
+ .unlocked_ioctl = video_ioctl2,
+ .mmap = vb2_fop_mmap,
+ .poll = vb2_fop_poll,
+};
+
+static void chv3_fb_frame_irq(struct chv3_fb *fb)
+{
+ struct chv3_fb_buffer *buf;
+
+ spin_lock(&fb->bufs_lock);
+
+ buf = list_first_entry_or_null(&fb->bufs, struct chv3_fb_buffer, link);
+ if (!buf)
+ goto empty;
+ list_del(&buf->link);
+
+ vb2_set_plane_payload(&buf->vb.vb2_buf, 0, fb->pix_fmt.sizeimage);
+ buf->vb.vb2_buf.timestamp = ktime_get_ns();
+ buf->vb.sequence = fb->sequence++;
+ buf->vb.field = V4L2_FIELD_NONE;
+ vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
+
+ buf = list_first_entry_or_null(&fb->bufs, struct chv3_fb_buffer, link);
+ if (buf) {
+ fb->writing_to_a = !fb->writing_to_a;
+ if (!list_is_last(&buf->link, &fb->bufs))
+ chv3_fb_next_frame(fb, list_next_entry(buf, link));
+ } else {
+ writel(0, fb->iobase + FB_EN);
+ }
+empty:
+ spin_unlock(&fb->bufs_lock);
+}
+
+static void chv3_fb_error_irq(struct chv3_fb *fb)
+{
+ if (vb2_is_streaming(&fb->queue))
+ vb2_queue_error(&fb->queue);
+}
+
+static void chv3_fb_resolution_irq(struct chv3_fb *fb)
+{
+ static const struct v4l2_event event = {
+ .type = V4L2_EVENT_SOURCE_CHANGE,
+ .u.src_change.changes = V4L2_EVENT_SRC_CH_RESOLUTION,
+ };
+
+ v4l2_event_queue(&fb->vdev, &event);
+ chv3_fb_error_irq(fb);
+}
+
+static irqreturn_t chv3_fb_isr(int irq, void *data)
+{
+ struct chv3_fb *fb = data;
+ unsigned int reg;
+
+ reg = readl(fb->iobase_irq + FB_IRQ_CLR);
+ if (!reg)
+ return IRQ_NONE;
+
+ if (reg & FB_IRQ_BUFF0)
+ chv3_fb_frame_irq(fb);
+ if (reg & FB_IRQ_BUFF1)
+ chv3_fb_frame_irq(fb);
+ if (reg & FB_IRQ_RESOLUTION)
+ chv3_fb_resolution_irq(fb);
+ if (reg & FB_IRQ_ERROR) {
+ dev_warn(fb->dev, "framebuffer error: 0x%x\n",
+ readl(fb->iobase + FB_ERRORSTATUS));
+ chv3_fb_error_irq(fb);
+ }
+
+ writel(reg, fb->iobase_irq + FB_IRQ_CLR);
+
+ return IRQ_HANDLED;
+}
+
+static int chv3_fb_check_version(struct chv3_fb *fb)
+{
+ u32 version;
+
+ version = readl(fb->iobase + FB_VERSION);
+ if (version != FB_VERSION_CURRENT) {
+ dev_err(fb->dev,
+ "wrong framebuffer version: expected %x, got %x\n",
+ FB_VERSION_CURRENT, version);
+ return -ENODEV;
+ }
+ return 0;
+}
+
+static void chv3_fb_set_default_format(struct chv3_fb *fb, bool legacy_format)
+{
+ struct v4l2_pix_format *pix = &fb->pix_fmt;
+
+ if (legacy_format)
+ pix->pixelformat = V4L2_PIX_FMT_BGRX32;
+ else
+ pix->pixelformat = V4L2_PIX_FMT_RGB24;
+ pix->field = V4L2_FIELD_NONE;
+ pix->colorspace = V4L2_COLORSPACE_SRGB;
+
+ chv3_fb_set_format_resolution(fb, DEFAULT_WIDTH, DEFAULT_HEIGHT);
+}
+
+static void chv3_fb_set_default_timings(struct chv3_fb *fb)
+{
+ memset(&fb->timings, 0, sizeof(fb->timings));
+ fb->timings.type = V4L2_DV_BT_656_1120;
+ fb->timings.bt.width = DEFAULT_WIDTH;
+ fb->timings.bt.height = DEFAULT_HEIGHT;
+}
+
+#define notifier_to_fb(nf) container_of(nf, struct chv3_fb, notifier)
+
+static int chv3_fb_async_notify_bound(struct v4l2_async_notifier *notifier,
+ struct v4l2_subdev *subdev,
+ struct v4l2_async_connection *asc)
+{
+ struct chv3_fb *fb = notifier_to_fb(notifier);
+ int pad;
+
+ pad = media_entity_get_fwnode_pad(&subdev->entity, asc->match.fwnode,
+ MEDIA_PAD_FL_SOURCE);
+ if (pad < 0)
+ return pad;
+
+ fb->subdev = subdev;
+ fb->subdev_source_pad = pad;
+
+ return 0;
+}
+
+static void chv3_fb_async_notify_unbind(struct v4l2_async_notifier *notifier,
+ struct v4l2_subdev *subdev,
+ struct v4l2_async_connection *asc)
+{
+ struct chv3_fb *fb = notifier_to_fb(notifier);
+
+ video_unregister_device(&fb->vdev);
+}
+
+static int chv3_fb_async_notify_complete(struct v4l2_async_notifier *notifier)
+{
+ struct chv3_fb *fb = notifier_to_fb(notifier);
+
+ return video_register_device(&fb->vdev, VFL_TYPE_VIDEO, -1);
+}
+
+static const struct v4l2_async_notifier_operations chv3_fb_async_notify_ops = {
+ .bound = chv3_fb_async_notify_bound,
+ .unbind = chv3_fb_async_notify_unbind,
+ .complete = chv3_fb_async_notify_complete,
+};
+
+static int chv3_fb_fallback_init(struct chv3_fb *fb)
+{
+ fb->subdev = NULL;
+ fb->subdev_source_pad = 0;
+
+ return video_register_device(&fb->vdev, VFL_TYPE_VIDEO, -1);
+}
+
+static int chv3_fb_fwnode_init(struct chv3_fb *fb)
+{
+ struct v4l2_async_connection *asc;
+ struct fwnode_handle *endpoint;
+ int res;
+
+ endpoint = fwnode_graph_get_next_endpoint(dev_fwnode(fb->dev), NULL);
+ if (!endpoint)
+ return -EINVAL;
+
+ v4l2_async_nf_init(&fb->notifier, &fb->v4l2_dev);
+
+ asc = v4l2_async_nf_add_fwnode_remote(&fb->notifier, endpoint,
+ struct v4l2_async_connection);
+ fwnode_handle_put(endpoint);
+
+ if (IS_ERR(asc))
+ return PTR_ERR(asc);
+
+ fb->notifier.ops = &chv3_fb_async_notify_ops;
+ res = v4l2_async_nf_register(&fb->notifier);
+ if (res) {
+ v4l2_async_nf_cleanup(&fb->notifier);
+ return res;
+ }
+
+ return 0;
+}
+
+static int chv3_fb_probe(struct platform_device *pdev)
+{
+ struct chv3_fb *fb;
+ bool legacy_format;
+ int res;
+ int irq;
+
+ fb = devm_kzalloc(&pdev->dev, sizeof(*fb), GFP_KERNEL);
+ if (!fb)
+ return -ENOMEM;
+ fb->dev = &pdev->dev;
+ platform_set_drvdata(pdev, fb);
+
+ /* map register space */
+ fb->iobase = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(fb->iobase))
+ return PTR_ERR(fb->iobase);
+
+ fb->iobase_irq = devm_platform_ioremap_resource(pdev, 1);
+ if (IS_ERR(fb->iobase_irq))
+ return PTR_ERR(fb->iobase_irq);
+
+ /* check hw version */
+ res = chv3_fb_check_version(fb);
+ if (res)
+ return res;
+
+ /* setup interrupts */
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0)
+ return -ENXIO;
+ res = devm_request_irq(&pdev->dev, irq, chv3_fb_isr, 0, DEVICE_NAME, fb);
+ if (res)
+ return res;
+
+ /* initialize v4l2_device */
+ res = v4l2_device_register(&pdev->dev, &fb->v4l2_dev);
+ if (res)
+ return res;
+
+ /* initialize vb2 queue */
+ fb->queue.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ fb->queue.io_modes = VB2_MMAP | VB2_DMABUF;
+ fb->queue.dev = &pdev->dev;
+ fb->queue.lock = &fb->fb_lock;
+ fb->queue.ops = &chv3_fb_vb2_ops;
+ fb->queue.mem_ops = &vb2_dma_contig_memops;
+ fb->queue.drv_priv = fb;
+ fb->queue.buf_struct_size = sizeof(struct chv3_fb_buffer);
+ fb->queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+ res = vb2_queue_init(&fb->queue);
+ if (res)
+ goto error;
+
+ /* initialize video_device */
+ strscpy(fb->vdev.name, DEVICE_NAME, sizeof(fb->vdev.name));
+ fb->vdev.fops = &chv3_fb_v4l2_fops;
+ fb->vdev.ioctl_ops = &chv3_fb_v4l2_ioctl_ops;
+ fb->vdev.lock = &fb->fb_lock;
+ fb->vdev.release = video_device_release_empty;
+ fb->vdev.device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
+ fb->vdev.v4l2_dev = &fb->v4l2_dev;
+ fb->vdev.queue = &fb->queue;
+ video_set_drvdata(&fb->vdev, fb);
+
+ /* read other DT properties */
+ legacy_format = device_property_read_bool(&pdev->dev, "google,legacy-format");
+
+ if (device_get_named_child_node(&pdev->dev, "port"))
+ res = chv3_fb_fwnode_init(fb);
+ else
+ res = chv3_fb_fallback_init(fb);
+ if (res)
+ goto error;
+
+ /* initialize rest of driver struct */
+ INIT_LIST_HEAD(&fb->bufs);
+ spin_lock_init(&fb->bufs_lock);
+ mutex_init(&fb->fb_lock);
+
+ chv3_fb_set_default_format(fb, legacy_format);
+ chv3_fb_set_default_timings(fb);
+
+ /* initialize hw */
+ writel(FB_RESET_BIT, fb->iobase + FB_RESET);
+ writel(FB_DATARATE_DOUBLE, fb->iobase + FB_DATARATE);
+ writel(FB_PIXELMODE_DOUBLE, fb->iobase + FB_PIXELMODE);
+ if (legacy_format)
+ writel(FB_DMAFORMAT_8BPC_LEGACY, fb->iobase + FB_DMAFORMAT);
+ else
+ writel(FB_DMAFORMAT_8BPC, fb->iobase + FB_DMAFORMAT);
+
+ writel(FB_IRQ_ALL, fb->iobase_irq + FB_IRQ_MASK);
+
+ return 0;
+
+error:
+ v4l2_device_unregister(&fb->v4l2_dev);
+
+ return res;
+}
+
+static void chv3_fb_remove(struct platform_device *pdev)
+{
+ struct chv3_fb *fb = platform_get_drvdata(pdev);
+
+ /* disable interrupts */
+ writel(0, fb->iobase_irq + FB_IRQ_MASK);
+
+ v4l2_async_nf_unregister(&fb->notifier);
+ v4l2_async_nf_cleanup(&fb->notifier);
+ v4l2_device_unregister(&fb->v4l2_dev);
+}
+
+static const struct of_device_id chv3_fb_match_table[] = {
+ { .compatible = "google,chv3-fb" },
+ { },
+};
+
+static struct platform_driver chv3_fb_platform_driver = {
+ .probe = chv3_fb_probe,
+ .remove_new = chv3_fb_remove,
+ .driver = {
+ .name = DEVICE_NAME,
+ .of_match_table = chv3_fb_match_table,
+ },
+};
+
+module_platform_driver(chv3_fb_platform_driver);
+
+MODULE_AUTHOR("Paweł Anikiel <panikiel@xxxxxxxxxx>");
+MODULE_DESCRIPTION("Google Chameleon v3 video framebuffer driver");
+MODULE_LICENSE("GPL");
--
2.44.0.rc0.258.g7320e95886-goog