[PATCH 3/5] media: sunxi: Add A10 CSI driver

Maxime Ripard
2018-11-13T08:24:15Z

The older CSI drivers have camera capture interface different from the one
in the newer ones.

This IP is pretty simple. Some variants (one controller out of two
instances on some SoCs) have an ISP embedded, but there's no code that make
use of it, so we ignored that part for now.

Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
---
drivers/media/platform/sunxi/Kconfig | 1 +-
drivers/media/platform/sunxi/Makefile | 1 +-
drivers/media/platform/sunxi/sun4i-csi/Kconfig | 12 +-
drivers/media/platform/sunxi/sun4i-csi/Makefile | 5 +-
drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c | 275 +++++++++-
drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.h | 137 +++++-
drivers/media/platform/sunxi/sun4i-csi/sun4i_dma.c | 383 +++++++++++++-
drivers/media/platform/sunxi/sun4i-csi/sun4i_v4l2.c | 287 ++++++++++-
8 files changed, 1101 insertions(+)
create mode 100644 drivers/media/platform/sunxi/sun4i-csi/Kconfig
create mode 100644 drivers/media/platform/sunxi/sun4i-csi/Makefile
create mode 100644 drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c
create mode 100644 drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.h
create mode 100644 drivers/media/platform/sunxi/sun4i-csi/sun4i_dma.c
create mode 100644 drivers/media/platform/sunxi/sun4i-csi/sun4i_v4l2.c

diff --git a/drivers/media/platform/sunxi/Kconfig b/drivers/media/platform/sunxi/Kconfig
index 1b6e89cb78b2..71808e93ac2e 100644
--- a/drivers/media/platform/sunxi/Kconfig
+++ b/drivers/media/platform/sunxi/Kconfig
@@ -1 +1,2 @@
+source "drivers/media/platform/sunxi/sun4i-csi/Kconfig"
source "drivers/media/platform/sunxi/sun6i-csi/Kconfig"
diff --git a/drivers/media/platform/sunxi/Makefile b/drivers/media/platform/sunxi/Makefile
index 8d06f98500ee..a05127529006 100644
--- a/drivers/media/platform/sunxi/Makefile
+++ b/drivers/media/platform/sunxi/Makefile
@@ -1 +1,2 @@
+obj-y += sun4i-csi/
obj-y += sun6i-csi/
diff --git a/drivers/media/platform/sunxi/sun4i-csi/Kconfig b/drivers/media/platform/sunxi/sun4i-csi/Kconfig
new file mode 100644
index 000000000000..841a6f4d9c99
--- /dev/null
+++ b/drivers/media/platform/sunxi/sun4i-csi/Kconfig
@@ -0,0 +1,12 @@
+config VIDEO_SUN4I_CSI
+ tristate "Allwinner A10 CMOS Sensor Interface Support"
+ depends on VIDEO_DEV && VIDEO_V4L2 && HAS_DMA
+ depends on ARCH_SUNXI || COMPILE_TEST
+ select VIDEOBUF2_DMA_CONTIG
+ select V4L2_FWNODE
+ select V4L2_MEM2MEM_DEV
+ help
+ This is a V4L2 driver for the Allwinner A10 CSI
+
+ To compile this driver as a module, choose M here: the module
+ will be called sun4i_csi.
diff --git a/drivers/media/platform/sunxi/sun4i-csi/Makefile b/drivers/media/platform/sunxi/sun4i-csi/Makefile
new file mode 100644
index 000000000000..7c790a57f5ee
--- /dev/null
+++ b/drivers/media/platform/sunxi/sun4i-csi/Makefile
@@ -0,0 +1,5 @@
+sun4i-csi-y += sun4i_csi.o
+sun4i-csi-y += sun4i_dma.o
+sun4i-csi-y += sun4i_v4l2.o
+
+obj-$(CONFIG_VIDEO_SUN4I_CSI) += sun4i-csi.o
diff --git a/drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c b/drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c
new file mode 100644
index 000000000000..3e0a65ccbbe2
--- /dev/null
+++ b/drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c
@@ -0,0 +1,275 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2016 NextThing Co
+ * Copyright (C) 2016-2018 Bootlin
+ *
+ * Author: Maxime Ripard <maxime.ripard@bootlin.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_graph.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/reset.h>
+#include <linux/videodev2.h>
+
+#include <media/v4l2-dev.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-fwnode.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-mediabus.h>
+
+#include <media/videobuf2-core.h>
+#include <media/videobuf2-dma-contig.h>
+
+#include "sun4i_csi.h"
+
+static int csi_notify_bound(struct v4l2_async_notifier *notifier,
+ struct v4l2_subdev *subdev,
+ struct v4l2_async_subdev *asd)
+{
+ struct sun4i_csi *csi = container_of(notifier, struct sun4i_csi,
+ notifier);
+
+ csi->src_subdev = subdev;
+ csi->src_pad = media_entity_get_fwnode_pad(&subdev->entity,
+ subdev->fwnode,
+ MEDIA_PAD_FL_SOURCE);
+ if (csi->src_pad < 0) {
+ dev_err(csi->dev, "Couldn't find output pad for subdev %s\n",
+ subdev->name);
+ return csi->src_pad;
+ }
+
+ dev_dbg(csi->dev, "Bound %s pad: %d\n", subdev->name, csi->src_pad);
+ return 0;
+}
+
+static int csi_notify_complete(struct v4l2_async_notifier *notifier)
+{
+ struct sun4i_csi *csi = container_of(notifier, struct sun4i_csi,
+ notifier);
+ int ret;
+
+ if (notifier->num_subdevs != 1)
+ return -EINVAL;
+
+ ret = v4l2_device_register_subdev_nodes(&csi->v4l);
+ if (ret < 0)
+ return ret;
+
+ ret = csi_v4l2_register(csi);
+ if (ret < 0)
+ return ret;
+
+ return media_create_pad_link(&csi->src_subdev->entity, csi->src_pad,
+ &csi->vdev.entity, 0,
+ MEDIA_LNK_FL_ENABLED |
+ MEDIA_LNK_FL_IMMUTABLE);
+}
+
+static const struct v4l2_async_notifier_operations csi_notify_ops = {
+ .bound = csi_notify_bound,
+ .complete = csi_notify_complete,
+};
+
+static int sun4i_csi_async_parse(struct device *dev,
+ struct v4l2_fwnode_endpoint *vep,
+ struct v4l2_async_subdev *asd)
+{
+ struct sun4i_csi *csi = dev_get_drvdata(dev);
+
+ if (vep->base.port || vep->base.id)
+ return -EINVAL;
+
+ if (vep->bus_type != V4L2_MBUS_PARALLEL)
+ return -EINVAL;
+
+ csi->bus = vep->bus.parallel;
+
+ return 0;
+}
+
+static int csi_probe(struct platform_device *pdev)
+{
+ struct sun4i_csi *csi;
+ struct resource *res;
+ int ret;
+ int irq;
+
+ csi = devm_kzalloc(&pdev->dev, sizeof(*csi), GFP_KERNEL);
+ if (!csi)
+ return -ENOMEM;
+ platform_set_drvdata(pdev, csi);
+ csi->dev = &pdev->dev;
+
+ csi->mdev.dev = csi->dev;
+ strlcpy(csi->mdev.model, "Allwinner Video Capture Device",
+ sizeof(csi->mdev.model));
+ csi->mdev.hw_revision = 0;
+ media_device_init(&csi->mdev);
+
+ csi->pad.flags = MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT;
+ ret = media_entity_pads_init(&csi->vdev.entity, 1, &csi->pad);
+ if (ret < 0)
+ return 0;
+
+ csi->has_isp = of_property_read_bool(pdev->dev.of_node,
+ "allwinner,has-isp");
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ csi->regs = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(csi->regs))
+ return PTR_ERR(csi->regs);
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0)
+ return irq;
+
+ csi->ahb_clk = devm_clk_get(&pdev->dev, "ahb");
+ if (IS_ERR(csi->ahb_clk)) {
+ dev_err(&pdev->dev, "Couldn't get our ahb clock\n");
+ return PTR_ERR(csi->ahb_clk);
+ }
+
+ if (csi->has_isp) {
+ csi->isp_clk = devm_clk_get(&pdev->dev, "isp");
+ if (IS_ERR(csi->isp_clk)) {
+ dev_err(&pdev->dev, "Couldn't get our ISP clock\n");
+ return PTR_ERR(csi->isp_clk);
+ }
+ }
+
+ csi->mod_clk = devm_clk_get(&pdev->dev, "mod");
+ if (IS_ERR(csi->mod_clk)) {
+ dev_err(&pdev->dev, "Couldn't get our mod clock\n");
+ return PTR_ERR(csi->mod_clk);
+ }
+
+ csi->ram_clk = devm_clk_get(&pdev->dev, "ram");
+ if (IS_ERR(csi->ram_clk)) {
+ dev_err(&pdev->dev, "Couldn't get our ram clock\n");
+ return PTR_ERR(csi->ram_clk);
+ }
+
+ csi->rst = devm_reset_control_get(&pdev->dev, NULL);
+ if (IS_ERR(csi->rst)) {
+ dev_err(&pdev->dev, "Couldn't get our reset line\n");
+ return PTR_ERR(csi->rst);
+ }
+
+ ret = csi_dma_register(csi, irq);
+ if (ret)
+ return ret;
+
+ csi->v4l.mdev = &csi->mdev;
+
+ ret = media_device_register(&csi->mdev);
+ if (ret)
+ goto err_unregister_dma;
+
+ ret = v4l2_async_notifier_parse_fwnode_endpoints(csi->dev,
+ &csi->notifier,
+ sizeof(struct v4l2_async_subdev),
+ sun4i_csi_async_parse);
+ if (ret)
+ goto err_unregister_media;
+ csi->notifier.ops = &csi_notify_ops;
+
+ ret = v4l2_async_notifier_register(&csi->v4l, &csi->notifier);
+ if (ret) {
+ dev_err(csi->dev,
+ "Couldn't register our v4l2-async notifier\n");
+ goto err_free_notifier;
+ }
+
+ pm_runtime_enable(&pdev->dev);
+
+ return 0;
+
+err_free_notifier:
+ v4l2_async_notifier_cleanup(&csi->notifier);
+
+err_unregister_media:
+ media_device_unregister(&csi->mdev);
+
+err_unregister_dma:
+ csi_dma_unregister(csi);
+ return ret;
+}
+
+static int csi_remove(struct platform_device *pdev)
+{
+ struct sun4i_csi *csi = platform_get_drvdata(pdev);
+
+ v4l2_async_notifier_unregister(&csi->notifier);
+ v4l2_async_notifier_cleanup(&csi->notifier);
+ media_device_unregister(&csi->mdev);
+ csi_dma_unregister(csi);
+
+ return 0;
+}
+
+static const struct of_device_id csi_of_match[] = {
+ { .compatible = "allwinner,sun4i-a10-csi" },
+ { /* Sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, csi_of_match);
+
+static int csi_runtime_resume(struct device *dev)
+{
+ struct sun4i_csi *csi = dev_get_drvdata(dev);
+
+ reset_control_deassert(csi->rst);
+ clk_prepare_enable(csi->ahb_clk);
+ clk_prepare_enable(csi->ram_clk);
+
+ if (csi->has_isp) {
+ clk_set_rate(csi->isp_clk, 80000000);
+ clk_prepare_enable(csi->isp_clk);
+ }
+
+ clk_set_rate(csi->mod_clk, 24000000);
+ clk_prepare_enable(csi->mod_clk);
+
+ writel(1, csi->regs + CSI_EN_REG);
+
+ return 0;
+}
+
+static int csi_runtime_suspend(struct device *dev)
+{
+ struct sun4i_csi *csi = dev_get_drvdata(dev);
+
+ clk_disable_unprepare(csi->mod_clk);
+
+ if (csi->has_isp)
+ clk_disable_unprepare(csi->isp_clk);
+
+ clk_disable_unprepare(csi->ram_clk);
+ clk_disable_unprepare(csi->ahb_clk);
+
+ reset_control_assert(csi->rst);
+
+ return 0;
+}
+
+static const struct dev_pm_ops csi_pm_ops = {
+ .runtime_resume = csi_runtime_resume,
+ .runtime_suspend = csi_runtime_suspend,
+};
+
+static struct platform_driver csi_driver = {
+ .probe = csi_probe,
+ .remove = csi_remove,
+ .driver = {
+ .name = "sun4i-csi",
+ .of_match_table = csi_of_match,
+ .pm = &csi_pm_ops,
+ },
+};
+module_platform_driver(csi_driver);
diff --git a/drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.h b/drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.h
new file mode 100644
index 000000000000..80ced01567fa
--- /dev/null
+++ b/drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.h
@@ -0,0 +1,137 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2016 NextThing Co
+ * Copyright (C) 2016-2018 Bootlin
+ *
+ * Author: Maxime Ripard <maxime.ripard@bootlin.com>
+ */
+
+#ifndef _SUN4I_CSI_H_
+#define _SUN4I_CSI_H_
+
+#include <media/media-device.h>
+#include <media/v4l2-async.h>
+#include <media/v4l2-dev.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-fwnode.h>
+#include <media/videobuf2-core.h>
+
+#define CSI_EN_REG 0x00
+
+#define CSI_CFG_REG 0x04
+#define CSI_CFG_INPUT_FMT(fmt) ((fmt) << 20)
+#define CSI_CFG_OUTPUT_FMT(fmt) ((fmt) << 16)
+#define CSI_CFG_YUV_DATA_SEQ(seq) ((seq) << 8)
+#define CSI_CFG_VSYNC_POL(pol) ((pol) << 2)
+#define CSI_CFG_HSYNC_POL(pol) ((pol) << 1)
+#define CSI_CFG_PCLK_POL(pol) ((pol) << 0)
+
+#define CSI_CPT_CTRL_REG 0x08
+#define CSI_CPT_CTRL_VIDEO_START BIT(1)
+#define CSI_CPT_CTRL_IMAGE_START BIT(0)
+
+#define CSI_BUF_ADDR_REG(fifo, buf) (0x10 + (0x8 * (fifo)) + (0x4 * (buf)))
+
+#define CSI_BUF_CTRL_REG 0x28
+#define CSI_BUF_CTRL_DBN BIT(2)
+#define CSI_BUF_CTRL_DBS BIT(1)
+#define CSI_BUF_CTRL_DBE BIT(0)
+
+#define CSI_INT_EN_REG 0x30
+#define CSI_INT_FRM_DONE BIT(1)
+#define CSI_INT_CPT_DONE BIT(0)
+
+#define CSI_INT_STA_REG 0x34
+
+#define CSI_WIN_CTRL_W_REG 0x40
+#define CSI_WIN_CTRL_W_ACTIVE(w) ((w) << 16)
+
+#define CSI_WIN_CTRL_H_REG 0x44
+#define CSI_WIN_CTRL_H_ACTIVE(h) ((h) << 16)
+
+#define CSI_BUF_LEN_REG 0x48
+
+#define CSI_MAX_BUFFER 2
+
+enum csi_input {
+ CSI_INPUT_RAW = 0,
+ CSI_INPUT_BT656 = 2,
+ CSI_INPUT_YUV = 3,
+};
+
+enum csi_output_raw {
+ CSI_OUTPUT_RAW_PASSTHROUGH = 0,
+};
+
+enum csi_output_yuv {
+ CSI_OUTPUT_YUV_422_PLANAR = 0,
+ CSI_OUTPUT_YUV_420_PLANAR = 1,
+ CSI_OUTPUT_YUV_422_UV = 4,
+ CSI_OUTPUT_YUV_420_UV = 5,
+ CSI_OUTPUT_YUV_422_MACRO = 8,
+ CSI_OUTPUT_YUV_420_MACRO = 9,
+};
+
+enum csi_yuv_data_seq {
+ CSI_YUV_DATA_SEQ_YUYV = 0,
+ CSI_YUV_DATA_SEQ_YVYU = 1,
+ CSI_YUV_DATA_SEQ_UYVY = 2,
+ CSI_YUV_DATA_SEQ_VYUY = 3,
+};
+
+struct sun4i_csi_format {
+ u32 mbus;
+ u32 fourcc;
+ enum csi_input input;
+ u32 output;
+ unsigned int num_planes;
+ u8 bpp[3];
+ unsigned int hsub;
+ unsigned int vsub;
+};
+
+struct sun4i_csi {
+ // Device resources
+ struct device *dev;
+
+ void __iomem *regs;
+ struct clk *ahb_clk;
+ struct clk *isp_clk;
+ struct clk *mod_clk;
+ struct clk *ram_clk;
+ struct reset_control *rst;
+ unsigned char has_isp;
+
+ const struct sun4i_csi_format *p_fmt;
+ struct v4l2_pix_format_mplane v_fmt;
+
+ struct vb2_v4l2_buffer *current_buf[CSI_MAX_BUFFER];
+
+ struct media_device mdev;
+ struct media_pad pad;
+
+ struct v4l2_fwnode_bus_parallel bus;
+
+ // V4L2 Async variables
+ struct v4l2_async_notifier notifier;
+ struct v4l2_subdev *src_subdev;
+ unsigned int src_pad;
+
+ // V4L2 variables
+ struct mutex lock;
+ struct v4l2_device v4l;
+ struct video_device vdev;
+
+ // Videobuf2
+ struct vb2_queue queue;
+ struct list_head buf_list;
+ spinlock_t qlock;
+ unsigned int sequence;
+};
+
+int csi_dma_register(struct sun4i_csi *csi, int irq);
+void csi_dma_unregister(struct sun4i_csi *csi);
+
+int csi_v4l2_register(struct sun4i_csi *csi);
+
+#endif /* _SUN4I_CSI_H_ */
diff --git a/drivers/media/platform/sunxi/sun4i-csi/sun4i_dma.c b/drivers/media/platform/sunxi/sun4i-csi/sun4i_dma.c
new file mode 100644
index 000000000000..989b46968e87
--- /dev/null
+++ b/drivers/media/platform/sunxi/sun4i-csi/sun4i_dma.c
@@ -0,0 +1,383 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2016 NextThing Co
+ * Copyright (C) 2016-2018 Bootlin
+ *
+ * Author: Maxime Ripard <maxime.ripard@bootlin.com>
+ */
+
+#include <linux/device.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/spinlock.h>
+#include <media/videobuf2-dma-contig.h>
+#include <media/videobuf2-v4l2.h>
+
+#include "sun4i_csi.h"
+
+struct csi_buffer {
+ struct vb2_v4l2_buffer vb;
+ struct list_head list;
+};
+
+static inline struct csi_buffer *vb2_v4l2_to_csi_buffer(const struct vb2_v4l2_buffer *p)
+{
+ return container_of(p, struct csi_buffer, vb);
+}
+
+static inline struct csi_buffer *vb2_to_csi_buffer(const struct vb2_buffer *p)
+{
+ return vb2_v4l2_to_csi_buffer(to_vb2_v4l2_buffer(p));
+}
+
+static void csi_capture_start(struct sun4i_csi *csi)
+{
+ writel(CSI_CPT_CTRL_VIDEO_START, csi->regs + CSI_CPT_CTRL_REG);
+}
+
+static void csi_capture_stop(struct sun4i_csi *csi)
+{
+ writel(0, csi->regs + CSI_CPT_CTRL_REG);
+}
+
+static int csi_queue_setup(struct vb2_queue *vq,
+ unsigned int *nbuffers,
+ unsigned int *nplanes,
+ unsigned int sizes[],
+ struct device *alloc_devs[])
+
+{
+ struct sun4i_csi *csi = vb2_get_drv_priv(vq);
+ unsigned int i;
+
+ if (*nbuffers < 3)
+ *nbuffers = 3;
+
+ *nplanes = csi->p_fmt->num_planes;
+
+ for (i = 0; i < *nplanes; i++)
+ sizes[i] = csi->v_fmt.plane_fmt[i].sizeimage;
+
+ return 0;
+};
+
+static int csi_buffer_prepare(struct vb2_buffer *vb)
+{
+ struct sun4i_csi *csi = vb2_get_drv_priv(vb->vb2_queue);
+ unsigned int i;
+
+ for (i = 0; i < csi->p_fmt->num_planes; i++) {
+ unsigned long size = csi->v_fmt.plane_fmt[i].sizeimage;
+
+ if (vb2_plane_size(vb, i) < size) {
+ dev_err(csi->dev, "buffer too small (%lu < %lu)\n",
+ vb2_plane_size(vb, i), size);
+ return -EINVAL;
+ }
+
+ vb2_set_plane_payload(vb, i, size);
+ }
+
+ return 0;
+}
+
+static int csi_buffer_fill_slot(struct sun4i_csi *csi, unsigned int slot)
+{
+ struct csi_buffer *c_buf;
+ struct vb2_v4l2_buffer *v_buf;
+ unsigned int plane;
+
+ /*
+ * We should never end up in a situation where we overwrite an
+ * already filled slot.
+ */
+ if (WARN_ON(csi->current_buf[slot]))
+ return -EINVAL;
+
+ if (list_empty(&csi->buf_list)) {
+ csi->current_buf[slot] = NULL;
+
+ dev_warn(csi->dev, "Running out of buffers...\n");
+ return -ENOMEM;
+ }
+
+ c_buf = list_first_entry(&csi->buf_list, struct csi_buffer, list);
+ list_del_init(&c_buf->list);
+
+ v_buf = &c_buf->vb;
+ csi->current_buf[slot] = v_buf;
+
+ for (plane = 0; plane < csi->p_fmt->num_planes; plane++) {
+ dma_addr_t buf_addr;
+
+ buf_addr = vb2_dma_contig_plane_dma_addr(&v_buf->vb2_buf,
+ plane);
+ writel(buf_addr, csi->regs + CSI_BUF_ADDR_REG(plane, slot));
+ }
+
+ return 0;
+}
+
+static int csi_buffer_fill_all(struct sun4i_csi *csi)
+{
+ unsigned int slot;
+ int ret;
+
+ for (slot = 0; slot < CSI_MAX_BUFFER; slot++) {
+ ret = csi_buffer_fill_slot(csi, slot);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static void csi_buffer_mark_done(struct sun4i_csi *csi,
+ unsigned int slot,
+ unsigned int sequence)
+{
+ struct vb2_v4l2_buffer *v_buf;
+
+ if (WARN_ON(!csi->current_buf[slot]))
+ return;
+
+ v_buf = csi->current_buf[slot];
+ v_buf->field = csi->v_fmt.field;
+ v_buf->sequence = sequence;
+ v_buf->vb2_buf.timestamp = ktime_get_ns();
+ vb2_buffer_done(&v_buf->vb2_buf, VB2_BUF_STATE_DONE);
+
+ csi->current_buf[slot] = NULL;
+}
+
+static int csi_buffer_flip(struct sun4i_csi *csi, unsigned int sequence)
+{
+ u32 reg = readl(csi->regs + CSI_BUF_CTRL_REG);
+ int curr, next;
+
+ /* Our next buffer is not the current buffer */
+ curr = !!(reg & CSI_BUF_CTRL_DBS);
+ next = !curr;
+
+ /* Report the previous buffer as done */
+ csi_buffer_mark_done(csi, next, sequence);
+
+ /* Put a new buffer in there */
+ return csi_buffer_fill_slot(csi, next);
+}
+
+static void csi_buffer_queue(struct vb2_buffer *vb)
+{
+ struct sun4i_csi *csi = vb2_get_drv_priv(vb->vb2_queue);
+ struct csi_buffer *buf = vb2_to_csi_buffer(vb);
+ unsigned long flags;
+
+ spin_lock_irqsave(&csi->qlock, flags);
+ list_add_tail(&buf->list, &csi->buf_list);
+ spin_unlock_irqrestore(&csi->qlock, flags);
+}
+
+static void return_all_buffers(struct sun4i_csi *csi,
+ enum vb2_buffer_state state)
+{
+ struct csi_buffer *buf, *node;
+ unsigned int slot;
+
+ list_for_each_entry_safe(buf, node, &csi->buf_list, list) {
+ vb2_buffer_done(&buf->vb.vb2_buf, state);
+ list_del(&buf->list);
+ }
+
+ for (slot = 0; slot < CSI_MAX_BUFFER; slot++) {
+ struct vb2_v4l2_buffer *v_buf = csi->current_buf[slot];
+
+ if (!v_buf)
+ continue;
+
+ vb2_buffer_done(&v_buf->vb2_buf, state);
+ csi->current_buf[slot] = NULL;
+ }
+}
+
+static int csi_start_streaming(struct vb2_queue *vq, unsigned int count)
+{
+ struct sun4i_csi *csi = vb2_get_drv_priv(vq);
+ struct v4l2_fwnode_bus_parallel *bus = &csi->bus;
+ unsigned long hsync_pol, pclk_pol, vsync_pol;
+ unsigned long flags;
+ int ret = 0;
+
+ csi->sequence = 0;
+
+ if (count < 2)
+ return -ENOBUFS;
+
+ ret = media_pipeline_start(&csi->vdev.entity, &csi->vdev.pipe);
+ if (ret < 0)
+ goto clear_dma_queue;
+
+ dev_dbg(csi->dev, "Starting capture\n");
+
+ spin_lock_irqsave(&csi->qlock, flags);
+
+ /* Setup timings */
+ writel(CSI_WIN_CTRL_W_ACTIVE(csi->v_fmt.width * 2),
+ csi->regs + CSI_WIN_CTRL_W_REG);
+ writel(CSI_WIN_CTRL_H_ACTIVE(csi->v_fmt.height),
+ csi->regs + CSI_WIN_CTRL_H_REG);
+
+ hsync_pol = !!(bus->flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH);
+ pclk_pol = !!(bus->flags & V4L2_MBUS_DATA_ACTIVE_HIGH);
+ vsync_pol = !!(bus->flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH);
+ writel(CSI_CFG_INPUT_FMT(csi->p_fmt->input) |
+ CSI_CFG_OUTPUT_FMT(csi->p_fmt->output) |
+ CSI_CFG_VSYNC_POL(vsync_pol) |
+ CSI_CFG_HSYNC_POL(hsync_pol) |
+ CSI_CFG_PCLK_POL(pclk_pol),
+ csi->regs + CSI_CFG_REG);
+
+ /* Setup buffer length */
+ writel(csi->v_fmt.plane_fmt[0].bytesperline,
+ csi->regs + CSI_BUF_LEN_REG);
+
+ /* Prepare our buffers in hardware */
+ ret = csi_buffer_fill_all(csi);
+ if (ret) {
+ spin_unlock_irqrestore(&csi->qlock, flags);
+ goto disable_pipeline;
+ }
+
+ /* Enable double buffering */
+ writel(CSI_BUF_CTRL_DBE, csi->regs + CSI_BUF_CTRL_REG);
+
+ /* Clear the pending interrupts */
+ writel(CSI_INT_FRM_DONE, csi->regs + 0x34);
+
+ /* Enable frame done interrupt */
+ writel(CSI_INT_FRM_DONE, csi->regs + CSI_INT_EN_REG);
+
+ csi_capture_start(csi);
+
+ spin_unlock_irqrestore(&csi->qlock, flags);
+
+ ret = v4l2_subdev_call(csi->src_subdev, video, s_stream, 1);
+ if (ret < 0 && ret != -ENOIOCTLCMD)
+ goto disable_pipeline;
+
+ return 0;
+
+disable_pipeline:
+ media_pipeline_stop(&csi->vdev.entity);
+
+clear_dma_queue:
+ return_all_buffers(csi, VB2_BUF_STATE_QUEUED);
+
+ return ret;
+}
+
+static void csi_stop_streaming(struct vb2_queue *vq)
+{
+ struct sun4i_csi *csi = vb2_get_drv_priv(vq);
+ unsigned long flags;
+
+ dev_dbg(csi->dev, "Stopping capture\n");
+
+ v4l2_subdev_call(csi->src_subdev, video, s_stream, 0);
+ csi_capture_stop(csi);
+
+ /* Release all active buffers */
+ spin_lock_irqsave(&csi->qlock, flags);
+ return_all_buffers(csi, VB2_BUF_STATE_ERROR);
+ spin_unlock_irqrestore(&csi->qlock, flags);
+
+ media_pipeline_stop(&csi->vdev.entity);
+}
+
+static struct vb2_ops csi_qops = {
+ .queue_setup = csi_queue_setup,
+ .buf_prepare = csi_buffer_prepare,
+ .buf_queue = csi_buffer_queue,
+ .start_streaming = csi_start_streaming,
+ .stop_streaming = csi_stop_streaming,
+ .wait_prepare = vb2_ops_wait_prepare,
+ .wait_finish = vb2_ops_wait_finish,
+};
+
+static irqreturn_t csi_irq(int irq, void *data)
+{
+ struct sun4i_csi *csi = data;
+ unsigned int sequence;
+ u32 reg;
+
+ reg = readl(csi->regs + CSI_INT_STA_REG);
+
+ /* Acknowledge the interrupts */
+ writel(reg, csi->regs + CSI_INT_STA_REG);
+
+ sequence = csi->sequence++;
+
+ if (!(reg & CSI_INT_FRM_DONE))
+ goto out;
+
+ spin_lock(&csi->qlock);
+ if (csi_buffer_flip(csi, sequence)) {
+ dev_warn(csi->dev, "%s: Flip failed\n", __func__);
+ csi_capture_stop(csi);
+ }
+ spin_unlock(&csi->qlock);
+
+out:
+ return IRQ_HANDLED;
+}
+
+int csi_dma_register(struct sun4i_csi *csi, int irq)
+{
+ struct vb2_queue *q = &csi->queue;
+ int ret;
+ int i;
+
+ ret = v4l2_device_register(csi->dev, &csi->v4l);
+ if (ret) {
+ dev_err(csi->dev, "Couldn't register the v4l2 device\n");
+ return ret;
+ }
+
+ spin_lock_init(&csi->qlock);
+ mutex_init(&csi->lock);
+
+ INIT_LIST_HEAD(&csi->buf_list);
+ for (i = 0; i < CSI_MAX_BUFFER; i++)
+ csi->current_buf[i] = NULL;
+
+ q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
+ q->io_modes = VB2_MMAP;
+ q->lock = &csi->lock;
+ q->drv_priv = csi;
+ q->buf_struct_size = sizeof(struct csi_buffer);
+ q->ops = &csi_qops;
+ q->mem_ops = &vb2_dma_contig_memops;
+ q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+ q->gfp_flags = GFP_DMA32;
+ q->dev = csi->dev;
+
+ ret = vb2_queue_init(q);
+ if (ret < 0) {
+ dev_err(csi->dev, "failed to initialize VB2 queue\n");
+ return ret;
+ }
+
+ ret = devm_request_irq(csi->dev, irq, csi_irq, 0,
+ dev_name(csi->dev), csi);
+ if (ret) {
+ dev_err(csi->dev, "Couldn't register our interrupt\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+void csi_dma_unregister(struct sun4i_csi *csi)
+{
+ v4l2_device_unregister(&csi->v4l);
+}
+
diff --git a/drivers/media/platform/sunxi/sun4i-csi/sun4i_v4l2.c b/drivers/media/platform/sunxi/sun4i-csi/sun4i_v4l2.c
new file mode 100644
index 000000000000..0b9487830e6d
--- /dev/null
+++ b/drivers/media/platform/sunxi/sun4i-csi/sun4i_v4l2.c
@@ -0,0 +1,287 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2016 NextThing Co
+ * Copyright (C) 2016-2018 Bootlin
+ *
+ * Author: Maxime Ripard <maxime.ripard@bootlin.com>
+ */
+
+#include <linux/device.h>
+#include <linux/pm_runtime.h>
+
+#include <media/v4l2-ioctl.h>
+#include <media/videobuf2-v4l2.h>
+
+#include "sun4i_csi.h"
+
+#define CSI_DEFAULT_FORMAT V4L2_PIX_FMT_YUV420M
+#define CSI_DEFAULT_WIDTH 640
+#define CSI_DEFAULT_HEIGHT 480
+
+#define CSI_MAX_HEIGHT 8192U
+#define CSI_MAX_WIDTH 8192U
+
+static const struct sun4i_csi_format csi_formats[] = {
+ /* YUV422 inputs */
+ {
+ .mbus = MEDIA_BUS_FMT_YUYV8_2X8,
+ .fourcc = V4L2_PIX_FMT_YUV420M,
+ .input = CSI_INPUT_YUV,
+ .output = CSI_OUTPUT_YUV_420_PLANAR,
+ .num_planes = 3,
+ .bpp = { 8, 8, 8 },
+ .hsub = 2,
+ .vsub = 2,
+ },
+};
+
+static const struct sun4i_csi_format *
+csi_get_format_by_fourcc(struct sun4i_csi *csi, u32 fourcc)
+{
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(csi_formats); i++)
+ if (csi_formats[i].fourcc == fourcc)
+ return &csi_formats[i];
+
+ return NULL;
+}
+
+static int csi_querycap(struct file *file, void *priv,
+ struct v4l2_capability *cap)
+{
+ struct sun4i_csi *csi = video_drvdata(file);
+
+ strscpy(cap->driver, KBUILD_MODNAME, sizeof(cap->driver));
+ strscpy(cap->card, "sun4i-csi", sizeof(cap->card));
+ snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
+ dev_name(csi->dev));
+ cap->device_caps = V4L2_CAP_VIDEO_CAPTURE_MPLANE | V4L2_CAP_STREAMING;
+ cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
+
+ return 0;
+}
+
+static int csi_enum_input(struct file *file, void *priv,
+ struct v4l2_input *inp)
+{
+ if (inp->index != 0)
+ return -EINVAL;
+
+ inp->type = V4L2_INPUT_TYPE_CAMERA;
+ strlcpy(inp->name, "Camera", sizeof(inp->name));
+
+ return 0;
+}
+
+static int csi_g_input(struct file *file, void *fh,
+ unsigned int *i)
+{
+ *i = 0;
+
+ return 0;
+}
+
+static int csi_s_input(struct file *file, void *fh,
+ unsigned int i)
+{
+ if (i != 0)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int _csi_try_fmt(struct sun4i_csi *csi,
+ struct v4l2_pix_format_mplane *pix,
+ const struct sun4i_csi_format **fmt)
+{
+ const struct sun4i_csi_format *_fmt;
+ unsigned int width = pix->width;
+ unsigned int height = pix->height;
+ int i;
+
+ _fmt = csi_get_format_by_fourcc(csi, pix->pixelformat);
+ if (!_fmt)
+ _fmt = csi_get_format_by_fourcc(csi, csi_formats[0].fourcc);
+
+ pix->field = V4L2_FIELD_NONE;
+ pix->colorspace = V4L2_COLORSPACE_SRGB;
+ pix->xfer_func = V4L2_MAP_XFER_FUNC_DEFAULT(pix->colorspace);
+ pix->ycbcr_enc = V4L2_MAP_YCBCR_ENC_DEFAULT(pix->colorspace);
+ pix->quantization = V4L2_MAP_QUANTIZATION_DEFAULT(true, pix->colorspace,
+ pix->ycbcr_enc);
+
+ pix->num_planes = _fmt->num_planes;
+ pix->pixelformat = _fmt->fourcc;
+
+ memset(pix->reserved, 0, sizeof(pix->reserved));
+
+ /* Align the width and height on the subsampling */
+ width = ALIGN(width, _fmt->hsub);
+ height = ALIGN(height, _fmt->vsub);
+
+ /* Clamp the width and height to our capabilities */
+ pix->width = clamp(width, _fmt->hsub, CSI_MAX_WIDTH);
+ pix->height = clamp(height, _fmt->vsub, CSI_MAX_HEIGHT);
+
+ for (i = 0; i < _fmt->num_planes; i++) {
+ unsigned int hsub = i > 0 ? _fmt->hsub : 1;
+ unsigned int vsub = i > 0 ? _fmt->vsub : 1;
+ unsigned int bpl;
+
+ bpl = pix->width / hsub * _fmt->bpp[i] / 8;
+ pix->plane_fmt[i].bytesperline = bpl;
+ pix->plane_fmt[i].sizeimage = bpl * pix->height / vsub;
+ memset(pix->plane_fmt[i].reserved, 0,
+ sizeof(pix->plane_fmt[i].reserved));
+ }
+
+ if (fmt)
+ *fmt = _fmt;
+
+ return 0;
+}
+
+static int csi_try_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ struct sun4i_csi *csi = video_drvdata(file);
+
+ if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
+ return -EINVAL;
+
+ return _csi_try_fmt(csi, &f->fmt.pix_mp, NULL);
+}
+
+static int csi_s_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ const struct sun4i_csi_format *fmt;
+ struct sun4i_csi *csi = video_drvdata(file);
+ int ret;
+
+ if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
+ return -EINVAL;
+
+ ret = _csi_try_fmt(csi, &f->fmt.pix_mp, &fmt);
+ if (ret)
+ return ret;
+
+ csi->v_fmt = f->fmt.pix_mp;
+ csi->p_fmt = fmt;
+
+ return 0;
+}
+
+static int csi_g_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ struct sun4i_csi *csi = video_drvdata(file);
+
+ if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
+ return -EINVAL;
+
+ f->fmt.pix_mp = csi->v_fmt;
+
+ return 0;
+}
+
+static int csi_enum_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_fmtdesc *f)
+{
+ if (f->index >= ARRAY_SIZE(csi_formats))
+ return -EINVAL;
+
+ f->pixelformat = csi_formats[f->index].fourcc;
+
+ return 0;
+}
+
+static const struct v4l2_ioctl_ops csi_ioctl_ops = {
+ .vidioc_querycap = csi_querycap,
+
+ .vidioc_enum_fmt_vid_cap_mplane = csi_enum_fmt_vid_cap,
+ .vidioc_g_fmt_vid_cap_mplane = csi_g_fmt_vid_cap,
+ .vidioc_s_fmt_vid_cap_mplane = csi_s_fmt_vid_cap,
+ .vidioc_try_fmt_vid_cap_mplane = csi_try_fmt_vid_cap,
+
+ .vidioc_enum_input = csi_enum_input,
+ .vidioc_g_input = csi_g_input,
+ .vidioc_s_input = csi_s_input,
+
+ .vidioc_reqbufs = vb2_ioctl_reqbufs,
+ .vidioc_create_bufs = vb2_ioctl_create_bufs,
+ .vidioc_querybuf = vb2_ioctl_querybuf,
+ .vidioc_qbuf = vb2_ioctl_qbuf,
+ .vidioc_dqbuf = vb2_ioctl_dqbuf,
+ .vidioc_expbuf = vb2_ioctl_expbuf,
+ .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
+ .vidioc_streamon = vb2_ioctl_streamon,
+ .vidioc_streamoff = vb2_ioctl_streamoff,
+};
+
+static int csi_open(struct file *file)
+{
+ struct sun4i_csi *csi = video_drvdata(file);
+ int ret;
+
+ pm_runtime_get_sync(csi->dev);
+
+ ret = v4l2_subdev_call(csi->src_subdev, core, s_power, 1);
+ if (ret < 0 && ret != -ENOIOCTLCMD)
+ return ret;
+
+ return v4l2_fh_open(file);
+}
+
+static int csi_release(struct file *file)
+{
+ struct sun4i_csi *csi = video_drvdata(file);
+
+ pm_runtime_put(csi->dev);
+
+ return vb2_fop_release(file);
+}
+
+static const struct v4l2_file_operations csi_fops = {
+ .owner = THIS_MODULE,
+ .open = csi_open,
+ .release = csi_release,
+ .unlocked_ioctl = video_ioctl2,
+ .read = vb2_fop_read,
+ .write = vb2_fop_write,
+ .poll = vb2_fop_poll,
+ .mmap = vb2_fop_mmap,
+};
+
+int csi_v4l2_register(struct sun4i_csi *csi)
+{
+ struct video_device *vdev = &csi->vdev;
+ int ret;
+
+ vdev->v4l2_dev = &csi->v4l;
+ vdev->queue = &csi->queue;
+ strlcpy(vdev->name, KBUILD_MODNAME, sizeof(vdev->name));
+ vdev->release = video_device_release_empty;
+ vdev->lock = &csi->lock;
+
+ /* Set a default format */
+ csi->v_fmt.pixelformat = CSI_DEFAULT_FORMAT;
+ csi->v_fmt.width = CSI_DEFAULT_WIDTH;
+ csi->v_fmt.height = CSI_DEFAULT_HEIGHT;
+ _csi_try_fmt(csi, &csi->v_fmt, NULL);
+
+ vdev->fops = &csi_fops;
+ vdev->ioctl_ops = &csi_ioctl_ops;
+ video_set_drvdata(vdev, csi);
+
+ ret = video_register_device(&csi->vdev, VFL_TYPE_GRABBER, -1);
+ if (ret)
+ return ret;
+
+ dev_info(csi->dev, "Device registered as %s\n",
+ video_device_node_name(vdev));
+
+ return 0;
+}
+
--
git-series 0.9.1