[PATCH 07/22] media: sunxi: Add support for the A31 MIPI CSI-2 controller

Paul Kocialkowski
2021-09-10T18:46:07Z

The A31 MIPI CSI-2 controller is a dedicated MIPI CSI-2 bridge
found on Allwinner SoCs such as the A31 and V3/V3s.

It is a standalone block, connected to the CSI controller on one side
and to the MIPI D-PHY block on the other. It has a dedicated address
space, interrupt line and clock.

It is represented as a V4L2 subdev to the CSI controller and takes a
MIPI CSI-2 sensor as its own subdev, all using the fwnode graph and
media controller API.

Only 8-bit and 10-bit Bayer formats are currently supported.
While up to 4 internal channels to the CSI controller exist, only one
is currently supported by this implementation.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Acked-by: Maxime Ripard <mripard@kernel.org>
---
drivers/media/platform/sunxi/Kconfig | 1 +
drivers/media/platform/sunxi/Makefile | 1 +
.../platform/sunxi/sun6i-mipi-csi2/Kconfig | 12 +
.../platform/sunxi/sun6i-mipi-csi2/Makefile | 4 +
.../sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.c | 746 ++++++++++++++++++
.../sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.h | 52 ++
.../sun6i-mipi-csi2/sun6i_mipi_csi2_reg.h | 82 ++
7 files changed, 898 insertions(+)
create mode 100644 drivers/media/platform/sunxi/sun6i-mipi-csi2/Kconfig
create mode 100644 drivers/media/platform/sunxi/sun6i-mipi-csi2/Makefile
create mode 100644 drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.c
create mode 100644 drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.h
create mode 100644 drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2_reg.h

diff --git a/drivers/media/platform/sunxi/Kconfig b/drivers/media/platform/sunxi/Kconfig
index 7151cc249afa..9684e07454ad 100644
--- a/drivers/media/platform/sunxi/Kconfig
+++ b/drivers/media/platform/sunxi/Kconfig
@@ -2,3 +2,4 @@

source "drivers/media/platform/sunxi/sun4i-csi/Kconfig"
source "drivers/media/platform/sunxi/sun6i-csi/Kconfig"
+source "drivers/media/platform/sunxi/sun6i-mipi-csi2/Kconfig"
diff --git a/drivers/media/platform/sunxi/Makefile b/drivers/media/platform/sunxi/Makefile
index fc537c9f5ca9..887a7cae8fca 100644
--- a/drivers/media/platform/sunxi/Makefile
+++ b/drivers/media/platform/sunxi/Makefile
@@ -2,5 +2,6 @@

obj-y += sun4i-csi/
obj-y += sun6i-csi/
+obj-y += sun6i-mipi-csi2/
obj-y += sun8i-di/
obj-y += sun8i-rotate/
diff --git a/drivers/media/platform/sunxi/sun6i-mipi-csi2/Kconfig b/drivers/media/platform/sunxi/sun6i-mipi-csi2/Kconfig
new file mode 100644
index 000000000000..47f1bb0779a8
--- /dev/null
+++ b/drivers/media/platform/sunxi/sun6i-mipi-csi2/Kconfig
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config VIDEO_SUN6I_MIPI_CSI2
+ tristate "Allwinner A31 MIPI CSI-2 Controller Driver"
+ depends on ARCH_SUNXI || COMPILE_TEST
+ depends on PM && COMMON_CLK && VIDEO_V4L2
+ select REGMAP_MMIO
+ select PHY_SUN6I_MIPI_DPHY
+ select MEDIA_CONTROLLER
+ select VIDEO_V4L2_SUBDEV_API
+ select V4L2_FWNODE
+ help
+ Support for the Allwinner A31 MIPI CSI-2 Controller.
diff --git a/drivers/media/platform/sunxi/sun6i-mipi-csi2/Makefile b/drivers/media/platform/sunxi/sun6i-mipi-csi2/Makefile
new file mode 100644
index 000000000000..14e4e03818b5
--- /dev/null
+++ b/drivers/media/platform/sunxi/sun6i-mipi-csi2/Makefile
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
+sun6i-mipi-csi2-y += sun6i_mipi_csi2.o
+
+obj-$(CONFIG_VIDEO_SUN6I_MIPI_CSI2) += sun6i-mipi-csi2.o
diff --git a/drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.c b/drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.c
new file mode 100644
index 000000000000..8b66d5fd7a56
--- /dev/null
+++ b/drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.c
@@ -0,0 +1,746 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2020-2021 Bootlin
+ * Author: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-fwnode.h>
+
+#include "sun6i_mipi_csi2.h"
+#include "sun6i_mipi_csi2_reg.h"
+
+/* Format */
+
+static const struct sun6i_mipi_csi2_format sun6i_mipi_csi2_formats[] = {
+ {
+ .mbus_code = MEDIA_BUS_FMT_SBGGR8_1X8,
+ .data_type = MIPI_CSI2_DATA_TYPE_RAW8,
+ .bpp = 8,
+ },
+ {
+ .mbus_code = MEDIA_BUS_FMT_SGBRG8_1X8,
+ .data_type = MIPI_CSI2_DATA_TYPE_RAW8,
+ .bpp = 8,
+ },
+ {
+ .mbus_code = MEDIA_BUS_FMT_SGRBG8_1X8,
+ .data_type = MIPI_CSI2_DATA_TYPE_RAW8,
+ .bpp = 8,
+ },
+ {
+ .mbus_code = MEDIA_BUS_FMT_SRGGB8_1X8,
+ .data_type = MIPI_CSI2_DATA_TYPE_RAW8,
+ .bpp = 8,
+ },
+ {
+ .mbus_code = MEDIA_BUS_FMT_SBGGR10_1X10,
+ .data_type = MIPI_CSI2_DATA_TYPE_RAW10,
+ .bpp = 10,
+ },
+ {
+ .mbus_code = MEDIA_BUS_FMT_SGBRG10_1X10,
+ .data_type = MIPI_CSI2_DATA_TYPE_RAW10,
+ .bpp = 10,
+ },
+ {
+ .mbus_code = MEDIA_BUS_FMT_SGRBG10_1X10,
+ .data_type = MIPI_CSI2_DATA_TYPE_RAW10,
+ .bpp = 10,
+ },
+ {
+ .mbus_code = MEDIA_BUS_FMT_SRGGB10_1X10,
+ .data_type = MIPI_CSI2_DATA_TYPE_RAW10,
+ .bpp = 10,
+ },
+};
+
+static const struct sun6i_mipi_csi2_format *
+sun6i_mipi_csi2_format_find(u32 mbus_code)
+{
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(sun6i_mipi_csi2_formats); i++)
+ if (sun6i_mipi_csi2_formats[i].mbus_code == mbus_code)
+ return &sun6i_mipi_csi2_formats[i];
+
+ return NULL;
+}
+
+/* Controller */
+
+static void sun6i_mipi_csi2_enable(struct sun6i_mipi_csi2_device *csi2_dev)
+{
+ struct regmap *regmap = csi2_dev->regmap;
+
+ regmap_update_bits(regmap, SUN6I_MIPI_CSI2_CTL_REG,
+ SUN6I_MIPI_CSI2_CTL_EN, SUN6I_MIPI_CSI2_CTL_EN);
+}
+
+static void sun6i_mipi_csi2_disable(struct sun6i_mipi_csi2_device *csi2_dev)
+{
+ struct regmap *regmap = csi2_dev->regmap;
+
+ regmap_update_bits(regmap, SUN6I_MIPI_CSI2_CTL_REG,
+ SUN6I_MIPI_CSI2_CTL_EN, 0);
+}
+
+static void sun6i_mipi_csi2_configure(struct sun6i_mipi_csi2_device *csi2_dev)
+{
+ struct regmap *regmap = csi2_dev->regmap;
+ unsigned int lanes_count =
+ csi2_dev->bridge.endpoint.bus.mipi_csi2.num_data_lanes;
+ struct v4l2_mbus_framefmt *mbus_format = &csi2_dev->bridge.mbus_format;
+ const struct sun6i_mipi_csi2_format *format;
+ struct device *dev = csi2_dev->dev;
+ u32 version = 0;
+
+ format = sun6i_mipi_csi2_format_find(mbus_format->code);
+ if (WARN_ON(!format))
+ return;
+
+ /*
+ * The enable flow in the Allwinner BSP is a bit different: the enable
+ * and reset bits are set together before starting the CSI controller.
+ *
+ * In mainline we enable the CSI controller first (due to subdev logic).
+ * One reliable way to make this work is to deassert reset, configure
+ * registers and enable the controller when everything's ready.
+ *
+ * However, setting the version enable bit and removing it afterwards
+ * appears necessary for capture to work reliably, while replacing it
+ * with a delay doesn't do the trick.
+ */
+ regmap_write(regmap, SUN6I_MIPI_CSI2_CTL_REG,
+ SUN6I_MIPI_CSI2_CTL_RESET_N |
+ SUN6I_MIPI_CSI2_CTL_VERSION_EN |
+ SUN6I_MIPI_CSI2_CTL_UNPK_EN);
+
+ regmap_read(regmap, SUN6I_MIPI_CSI2_VERSION_REG, &version);
+
+ regmap_update_bits(regmap, SUN6I_MIPI_CSI2_CTL_REG,
+ SUN6I_MIPI_CSI2_CTL_VERSION_EN, 0);
+
+ dev_dbg(dev, "A31 MIPI CSI-2 version: %04x\n", version);
+
+ regmap_write(regmap, SUN6I_MIPI_CSI2_CFG_REG,
+ SUN6I_MIPI_CSI2_CFG_CHANNEL_MODE(1) |
+ SUN6I_MIPI_CSI2_CFG_LANE_COUNT(lanes_count));
+
+ /*
+ * Only a single virtual channel (index 0) is currently supported.
+ * While the registers do mention multiple physical channels being
+ * available (which can be configured to match a specific virtual
+ * channel or data type), it's unclear whether channels > 0 are actually
+ * connected and available and the reference source code only makes use
+ * of channel 0.
+ *
+ * Using extra channels would also require matching channels to be
+ * available on the CSI (and ISP) side, which is also unsure although
+ * some CSI implementations are said to support multiple channels for
+ * BT656 time-sharing.
+ *
+ * We still configure virtual channel numbers to ensure that virtual
+ * channel 0 only goes to channel 0.
+ */
+
+ regmap_write(regmap, SUN6I_MIPI_CSI2_VCDT_RX_REG,
+ SUN6I_MIPI_CSI2_VCDT_RX_CH_VC(3, 3) |
+ SUN6I_MIPI_CSI2_VCDT_RX_CH_VC(2, 2) |
+ SUN6I_MIPI_CSI2_VCDT_RX_CH_VC(1, 1) |
+ SUN6I_MIPI_CSI2_VCDT_RX_CH_VC(0, 0) |
+ SUN6I_MIPI_CSI2_VCDT_RX_CH_DT(0, format->data_type));
+
+ regmap_write(regmap, SUN6I_MIPI_CSI2_CH_INT_PD_REG,
+ SUN6I_MIPI_CSI2_CH_INT_PD_CLEAR);
+}
+
+/* V4L2 Subdev */
+
+static int sun6i_mipi_csi2_s_stream(struct v4l2_subdev *subdev, int on)
+{
+ struct sun6i_mipi_csi2_device *csi2_dev = v4l2_get_subdevdata(subdev);
+ struct v4l2_subdev *source_subdev = csi2_dev->bridge.source_subdev;
+ union phy_configure_opts dphy_opts = { 0 };
+ struct phy_configure_opts_mipi_dphy *dphy_cfg = &dphy_opts.mipi_dphy;
+ struct v4l2_mbus_framefmt *mbus_format = &csi2_dev->bridge.mbus_format;
+ const struct sun6i_mipi_csi2_format *format;
+ struct phy *dphy = csi2_dev->dphy;
+ struct device *dev = csi2_dev->dev;
+ struct v4l2_ctrl *ctrl;
+ unsigned int lanes_count =
+ csi2_dev->bridge.endpoint.bus.mipi_csi2.num_data_lanes;
+ unsigned long pixel_rate;
+ /* Initialize to 0 to use both in disable label (ret != 0) and off. */
+ int ret = 0;
+
+ if (!source_subdev)
+ return -ENODEV;
+
+ if (!on) {
+ v4l2_subdev_call(source_subdev, video, s_stream, 0);
+ goto disable;
+ }
+
+ /* Runtime PM */
+
+ ret = pm_runtime_resume_and_get(dev);
+ if (ret < 0)
+ return ret;
+
+ /* Sensor Pixel Rate */
+
+ ctrl = v4l2_ctrl_find(source_subdev->ctrl_handler, V4L2_CID_PIXEL_RATE);
+ if (!ctrl) {
+ dev_err(dev, "missing sensor pixel rate\n");
+ ret = -ENODEV;
+ goto error_pm;
+ }
+
+ pixel_rate = (unsigned long)v4l2_ctrl_g_ctrl_int64(ctrl);
+ if (!pixel_rate) {
+ dev_err(dev, "missing (zero) sensor pixel rate\n");
+ ret = -ENODEV;
+ goto error_pm;
+ }
+
+ /* D-PHY */
+
+ if (!lanes_count) {
+ dev_err(dev, "missing (zero) MIPI CSI-2 lanes count\n");
+ ret = -ENODEV;
+ goto error_pm;
+ }
+
+ format = sun6i_mipi_csi2_format_find(mbus_format->code);
+ if (WARN_ON(!format)) {
+ ret = -ENODEV;
+ goto error_pm;
+ }
+
+ phy_mipi_dphy_get_default_config(pixel_rate, format->bpp, lanes_count,
+ dphy_cfg);
+
+ /*
+ * Note that our hardware is using DDR, which is not taken in account by
+ * phy_mipi_dphy_get_default_config when calculating hs_clk_rate from
+ * the pixel rate, lanes count and bpp.
+ *
+ * The resulting clock rate is basically the symbol rate over the whole
+ * link. The actual clock rate is calculated with division by two since
+ * DDR samples both on rising and falling edges.
+ */
+
+ dev_dbg(dev, "A31 MIPI CSI-2 config:\n");
+ dev_dbg(dev, "%ld pixels/s, %u bits/pixel, %u lanes, %lu Hz clock\n",
+ pixel_rate, format->bpp, lanes_count,
+ dphy_cfg->hs_clk_rate / 2);
+
+ ret = phy_reset(dphy);
+ if (ret) {
+ dev_err(dev, "failed to reset MIPI D-PHY\n");
+ goto error_pm;
+ }
+
+ ret = phy_configure(dphy, &dphy_opts);
+ if (ret) {
+ dev_err(dev, "failed to configure MIPI D-PHY\n");
+ goto error_pm;
+ }
+
+ /* Controller */
+
+ sun6i_mipi_csi2_configure(csi2_dev);
+ sun6i_mipi_csi2_enable(csi2_dev);
+
+ /* D-PHY */
+
+ ret = phy_power_on(dphy);
+ if (ret) {
+ dev_err(dev, "failed to power on MIPI D-PHY\n");
+ goto error_pm;
+ }
+
+ /* Source */
+
+ ret = v4l2_subdev_call(source_subdev, video, s_stream, 1);
+ if (ret && ret != -ENOIOCTLCMD)
+ goto disable;
+
+ return 0;
+
+disable:
+ phy_power_off(dphy);
+ sun6i_mipi_csi2_disable(csi2_dev);
+
+error_pm:
+ pm_runtime_put(dev);
+
+ return ret;
+}
+
+static const struct v4l2_subdev_video_ops sun6i_mipi_csi2_video_ops = {
+ .s_stream = sun6i_mipi_csi2_s_stream,
+};
+
+static void
+sun6i_mipi_csi2_mbus_format_prepare(struct v4l2_mbus_framefmt *mbus_format)
+{
+ if (!sun6i_mipi_csi2_format_find(mbus_format->code))
+ mbus_format->code = sun6i_mipi_csi2_formats[0].mbus_code;
+
+ mbus_format->field = V4L2_FIELD_NONE;
+ mbus_format->colorspace = V4L2_COLORSPACE_RAW;
+ mbus_format->quantization = V4L2_QUANTIZATION_DEFAULT;
+ mbus_format->xfer_func = V4L2_XFER_FUNC_DEFAULT;
+}
+
+static int sun6i_mipi_csi2_init_cfg(struct v4l2_subdev *subdev,
+ struct v4l2_subdev_state *state)
+{
+ unsigned int pad = SUN6I_MIPI_CSI2_PAD_SINK;
+ struct v4l2_mbus_framefmt *mbus_format =
+ v4l2_subdev_get_try_format(subdev, state, pad);
+
+ mbus_format->code = sun6i_mipi_csi2_formats[0].mbus_code;
+ mbus_format->width = 640;
+ mbus_format->height = 480;
+
+ sun6i_mipi_csi2_mbus_format_prepare(mbus_format);
+
+ return 0;
+}
+
+static int
+sun6i_mipi_csi2_enum_mbus_code(struct v4l2_subdev *subdev,
+ struct v4l2_subdev_state *state,
+ struct v4l2_subdev_mbus_code_enum *code_enum)
+{
+ if (code_enum->index >= ARRAY_SIZE(sun6i_mipi_csi2_formats))
+ return -EINVAL;
+
+ code_enum->code = sun6i_mipi_csi2_formats[code_enum->index].mbus_code;
+
+ return 0;
+}
+
+static int sun6i_mipi_csi2_get_fmt(struct v4l2_subdev *subdev,
+ struct v4l2_subdev_state *state,
+ struct v4l2_subdev_format *format)
+{
+ struct sun6i_mipi_csi2_device *csi2_dev = v4l2_get_subdevdata(subdev);
+ struct v4l2_mbus_framefmt *mbus_format = &format->format;
+
+ if (format->which == V4L2_SUBDEV_FORMAT_TRY)
+ *mbus_format = *v4l2_subdev_get_try_format(subdev, state,
+ format->pad);
+ else
+ *mbus_format = csi2_dev->bridge.mbus_format;
+
+ return 0;
+}
+
+static int sun6i_mipi_csi2_set_fmt(struct v4l2_subdev *subdev,
+ struct v4l2_subdev_state *state,
+ struct v4l2_subdev_format *format)
+{
+ struct sun6i_mipi_csi2_device *csi2_dev = v4l2_get_subdevdata(subdev);
+ struct v4l2_mbus_framefmt *mbus_format = &format->format;
+
+ sun6i_mipi_csi2_mbus_format_prepare(mbus_format);
+
+ if (format->which == V4L2_SUBDEV_FORMAT_TRY)
+ *v4l2_subdev_get_try_format(subdev, state, format->pad) =
+ *mbus_format;
+ else
+ csi2_dev->bridge.mbus_format = *mbus_format;
+
+ return 0;
+}
+
+static const struct v4l2_subdev_pad_ops sun6i_mipi_csi2_pad_ops = {
+ .init_cfg = sun6i_mipi_csi2_init_cfg,
+ .enum_mbus_code = sun6i_mipi_csi2_enum_mbus_code,
+ .get_fmt = sun6i_mipi_csi2_get_fmt,
+ .set_fmt = sun6i_mipi_csi2_set_fmt,
+};
+
+static const struct v4l2_subdev_ops sun6i_mipi_csi2_subdev_ops = {
+ .video = &sun6i_mipi_csi2_video_ops,
+ .pad = &sun6i_mipi_csi2_pad_ops,
+};
+
+/* Media Entity */
+
+static const struct media_entity_operations sun6i_mipi_csi2_entity_ops = {
+ .link_validate = v4l2_subdev_link_validate,
+};
+
+/* V4L2 Async */
+
+static int
+sun6i_mipi_csi2_notifier_bound(struct v4l2_async_notifier *notifier,
+ struct v4l2_subdev *remote_subdev,
+ struct v4l2_async_subdev *async_subdev)
+{
+ struct v4l2_subdev *subdev = notifier->sd;
+ struct sun6i_mipi_csi2_device *csi2_dev =
+ container_of(notifier, struct sun6i_mipi_csi2_device,
+ bridge.notifier);
+ struct media_entity *sink_entity = &subdev->entity;
+ struct media_entity *source_entity = &remote_subdev->entity;
+ struct device *dev = csi2_dev->dev;
+ int sink_pad_index = 0;
+ int source_pad_index;
+ int ret;
+
+ ret = media_entity_get_fwnode_pad(source_entity, remote_subdev->fwnode,
+ MEDIA_PAD_FL_SOURCE);
+ if (ret < 0) {
+ dev_err(dev, "missing source pad in external entity %s\n",
+ source_entity->name);
+ return -EINVAL;
+ }
+
+ source_pad_index = ret;
+
+ dev_dbg(dev, "creating %s:%u -> %s:%u link\n", source_entity->name,
+ source_pad_index, sink_entity->name, sink_pad_index);
+
+ ret = media_create_pad_link(source_entity, source_pad_index,
+ sink_entity, sink_pad_index,
+ MEDIA_LNK_FL_ENABLED |
+ MEDIA_LNK_FL_IMMUTABLE);
+ if (ret) {
+ dev_err(dev, "failed to create %s:%u -> %s:%u link\n",
+ source_entity->name, source_pad_index,
+ sink_entity->name, sink_pad_index);
+ return ret;
+ }
+
+ csi2_dev->bridge.source_subdev = remote_subdev;
+
+ return 0;
+}
+
+static const struct v4l2_async_notifier_operations
+sun6i_mipi_csi2_notifier_ops = {
+ .bound = sun6i_mipi_csi2_notifier_bound,
+};
+
+/* Bridge */
+
+static int
+sun6i_mipi_csi2_bridge_source_setup(struct sun6i_mipi_csi2_device *csi2_dev)
+{
+ struct v4l2_async_notifier *notifier = &csi2_dev->bridge.notifier;
+ struct v4l2_fwnode_endpoint *endpoint = &csi2_dev->bridge.endpoint;
+ struct v4l2_async_subdev *subdev_async;
+ struct fwnode_handle *handle;
+ struct device *dev = csi2_dev->dev;
+ int ret;
+
+ handle = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), 0, 0,
+ FWNODE_GRAPH_ENDPOINT_NEXT);
+ if (!handle)
+ return -ENODEV;
+
+ endpoint->bus_type = V4L2_MBUS_CSI2_DPHY;
+
+ ret = v4l2_fwnode_endpoint_parse(handle, endpoint);
+ if (ret)
+ goto complete;
+
+ subdev_async = v4l2_async_notifier_add_fwnode_remote_subdev(notifier,
+ handle, struct v4l2_async_subdev);
+ if (IS_ERR(subdev_async))
+ ret = PTR_ERR(subdev_async);
+
+complete:
+ fwnode_handle_put(handle);
+
+ return ret;
+}
+
+static int sun6i_mipi_csi2_bridge_setup(struct sun6i_mipi_csi2_device *csi2_dev)
+{
+ struct v4l2_subdev *subdev = &csi2_dev->bridge.subdev;
+ struct v4l2_async_notifier *notifier = &csi2_dev->bridge.notifier;
+ struct media_pad *pads = csi2_dev->bridge.pads;
+ struct device *dev = csi2_dev->dev;
+ int ret;
+
+ /* V4L2 Subdev */
+
+ v4l2_subdev_init(subdev, &sun6i_mipi_csi2_subdev_ops);
+ strscpy(subdev->name, SUN6I_MIPI_CSI2_NAME, sizeof(subdev->name));
+ subdev->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+ subdev->owner = THIS_MODULE;
+ subdev->dev = dev;
+
+ v4l2_set_subdevdata(subdev, csi2_dev);
+
+ /* Media Entity */
+
+ subdev->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
+ subdev->entity.ops = &sun6i_mipi_csi2_entity_ops;
+
+ /* Media Pads */
+
+ pads[SUN6I_MIPI_CSI2_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
+ pads[SUN6I_MIPI_CSI2_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
+
+ ret = media_entity_pads_init(&subdev->entity, SUN6I_MIPI_CSI2_PAD_COUNT,
+ pads);
+ if (ret)
+ return ret;
+
+ /* V4L2 Async */
+
+ v4l2_async_notifier_init(notifier);
+ notifier->ops = &sun6i_mipi_csi2_notifier_ops;
+
+ ret = sun6i_mipi_csi2_bridge_source_setup(csi2_dev);
+ if (ret)
+ goto error_v4l2_notifier_cleanup;
+
+ ret = v4l2_async_subdev_notifier_register(subdev, notifier);
+ if (ret < 0)
+ goto error_v4l2_notifier_cleanup;
+
+ /* V4L2 Subdev */
+
+ ret = v4l2_async_register_subdev(subdev);
+ if (ret < 0)
+ goto error_v4l2_notifier_unregister;
+
+ return 0;
+
+error_v4l2_notifier_unregister:
+ v4l2_async_notifier_unregister(notifier);
+
+error_v4l2_notifier_cleanup:
+ v4l2_async_notifier_cleanup(notifier);
+
+ media_entity_cleanup(&subdev->entity);
+
+ return ret;
+}
+
+static void
+sun6i_mipi_csi2_bridge_cleanup(struct sun6i_mipi_csi2_device *csi2_dev)
+{
+ struct v4l2_subdev *subdev = &csi2_dev->bridge.subdev;
+ struct v4l2_async_notifier *notifier = &csi2_dev->bridge.notifier;
+
+ v4l2_async_unregister_subdev(subdev);
+ v4l2_async_notifier_unregister(notifier);
+ v4l2_async_notifier_cleanup(notifier);
+ media_entity_cleanup(&subdev->entity);
+}
+
+/* Platform */
+
+static int sun6i_mipi_csi2_suspend(struct device *dev)
+{
+ struct sun6i_mipi_csi2_device *csi2_dev = dev_get_drvdata(dev);
+
+ clk_disable_unprepare(csi2_dev->clk_mod);
+ clk_disable_unprepare(csi2_dev->clk_bus);
+ reset_control_assert(csi2_dev->reset);
+
+ return 0;
+}
+
+static int sun6i_mipi_csi2_resume(struct device *dev)
+{
+ struct sun6i_mipi_csi2_device *csi2_dev = dev_get_drvdata(dev);
+ int ret;
+
+ ret = reset_control_deassert(csi2_dev->reset);
+ if (ret) {
+ dev_err(dev, "failed to deassert reset\n");
+ return ret;
+ }
+
+ ret = clk_prepare_enable(csi2_dev->clk_bus);
+ if (ret) {
+ dev_err(dev, "failed to enable bus clock\n");
+ goto error_reset;
+ }
+
+ ret = clk_prepare_enable(csi2_dev->clk_mod);
+ if (ret) {
+ dev_err(dev, "failed to enable module clock\n");
+ goto error_clk_bus;
+ }
+
+ return 0;
+
+error_clk_bus:
+ clk_disable_unprepare(csi2_dev->clk_bus);
+
+error_reset:
+ reset_control_assert(csi2_dev->reset);
+
+ return ret;
+}
+
+static const struct dev_pm_ops sun6i_mipi_csi2_pm_ops = {
+ SET_RUNTIME_PM_OPS(sun6i_mipi_csi2_suspend, sun6i_mipi_csi2_resume,
+ NULL)
+};
+
+static const struct regmap_config sun6i_mipi_csi2_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = 0x400,
+};
+
+static int
+sun6i_mipi_csi2_resources_setup(struct sun6i_mipi_csi2_device *csi2_dev,
+ struct platform_device *platform_dev)
+{
+ struct device *dev = csi2_dev->dev;
+ struct resource *res;
+ void __iomem *io_base;
+ int ret;
+
+ /* Registers */
+
+ res = platform_get_resource(platform_dev, IORESOURCE_MEM, 0);
+ io_base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(io_base))
+ return PTR_ERR(io_base);
+
+ csi2_dev->regmap = devm_regmap_init_mmio(dev, io_base,
+ &sun6i_mipi_csi2_regmap_config);
+ if (IS_ERR(csi2_dev->regmap)) {
+ dev_err(dev, "failed to init register map\n");
+ return PTR_ERR(csi2_dev->regmap);
+ }
+
+ /* Clocks */
+
+ csi2_dev->clk_bus = devm_clk_get(dev, "bus");
+ if (IS_ERR(csi2_dev->clk_bus)) {
+ dev_err(dev, "failed to acquire bus clock\n");
+ return PTR_ERR(csi2_dev->clk_bus);
+ }
+
+ csi2_dev->clk_mod = devm_clk_get(dev, "mod");
+ if (IS_ERR(csi2_dev->clk_mod)) {
+ dev_err(dev, "failed to acquire mod clock\n");
+ return PTR_ERR(csi2_dev->clk_mod);
+ }
+
+ ret = clk_set_rate_exclusive(csi2_dev->clk_mod, 297000000);
+ if (ret) {
+ dev_err(dev, "failed to set mod clock rate\n");
+ return ret;
+ }
+
+ /* Reset */
+
+ csi2_dev->reset = devm_reset_control_get_shared(dev, NULL);
+ if (IS_ERR(csi2_dev->reset)) {
+ dev_err(dev, "failed to get reset controller\n");
+ return PTR_ERR(csi2_dev->reset);
+ }
+
+ /* D-PHY */
+
+ csi2_dev->dphy = devm_phy_get(dev, "dphy");
+ if (IS_ERR(csi2_dev->dphy)) {
+ dev_err(dev, "failed to get MIPI D-PHY\n");
+ return PTR_ERR(csi2_dev->dphy);
+ }
+
+ ret = phy_init(csi2_dev->dphy);
+ if (ret) {
+ dev_err(dev, "failed to initialize MIPI D-PHY\n");
+ return ret;
+ }
+
+ /* Runtime PM */
+
+ pm_runtime_enable(dev);
+ pm_runtime_set_suspended(dev);
+
+ return 0;
+}
+
+static void
+sun6i_mipi_csi2_resources_cleanup(struct sun6i_mipi_csi2_device *csi2_dev)
+{
+ pm_runtime_disable(csi2_dev->dev);
+ phy_exit(csi2_dev->dphy);
+ clk_rate_exclusive_put(csi2_dev->clk_mod);
+}
+
+static int sun6i_mipi_csi2_probe(struct platform_device *platform_dev)
+{
+ struct sun6i_mipi_csi2_device *csi2_dev;
+ struct device *dev = &platform_dev->dev;
+ int ret;
+
+ csi2_dev = devm_kzalloc(dev, sizeof(*csi2_dev), GFP_KERNEL);
+ if (!csi2_dev)
+ return -ENOMEM;
+
+ csi2_dev->dev = dev;
+ platform_set_drvdata(platform_dev, csi2_dev);
+
+ ret = sun6i_mipi_csi2_resources_setup(csi2_dev, platform_dev);
+ if (ret)
+ return ret;
+
+ ret = sun6i_mipi_csi2_bridge_setup(csi2_dev);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int sun6i_mipi_csi2_remove(struct platform_device *platform_dev)
+{
+ struct sun6i_mipi_csi2_device *csi2_dev =
+ platform_get_drvdata(platform_dev);
+
+ sun6i_mipi_csi2_bridge_cleanup(csi2_dev);
+ sun6i_mipi_csi2_resources_cleanup(csi2_dev);
+
+ return 0;
+}
+
+static const struct of_device_id sun6i_mipi_csi2_of_match[] = {
+ { .compatible = "allwinner,sun6i-a31-mipi-csi2" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, sun6i_mipi_csi2_of_match);
+
+static struct platform_driver sun6i_mipi_csi2_platform_driver = {
+ .probe = sun6i_mipi_csi2_probe,
+ .remove = sun6i_mipi_csi2_remove,
+ .driver = {
+ .name = SUN6I_MIPI_CSI2_NAME,
+ .of_match_table = of_match_ptr(sun6i_mipi_csi2_of_match),
+ .pm = &sun6i_mipi_csi2_pm_ops,
+ },
+};
+module_platform_driver(sun6i_mipi_csi2_platform_driver);
+
+MODULE_DESCRIPTION("Allwinner A31 MIPI CSI-2 Controller Driver");
+MODULE_AUTHOR("Paul Kocialkowski <paul.kocialkowski@bootlin.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.h b/drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.h
new file mode 100644
index 000000000000..25a8a0d0dfad
--- /dev/null
+++ b/drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.h
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2020-2021 Bootlin
+ * Author: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
+ */
+
+#ifndef _SUN6I_MIPI_CSI2_H_
+#define _SUN6I_MIPI_CSI2_H_
+
+#include <linux/phy/phy.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-fwnode.h>
+
+#define SUN6I_MIPI_CSI2_NAME "sun6i-mipi-csi2"
+
+enum sun6i_mipi_csi2_pad {
+ SUN6I_MIPI_CSI2_PAD_SINK = 0,
+ SUN6I_MIPI_CSI2_PAD_SOURCE = 1,
+ SUN6I_MIPI_CSI2_PAD_COUNT = 2,
+};
+
+struct sun6i_mipi_csi2_format {
+ u32 mbus_code;
+ u8 data_type;
+ u32 bpp;
+};
+
+struct sun6i_mipi_csi2_bridge {
+ struct v4l2_subdev subdev;
+ struct media_pad pads[SUN6I_MIPI_CSI2_PAD_COUNT];
+ struct v4l2_fwnode_endpoint endpoint;
+ struct v4l2_async_notifier notifier;
+ struct v4l2_mbus_framefmt mbus_format;
+
+ struct v4l2_subdev *source_subdev;
+};
+
+struct sun6i_mipi_csi2_device {
+ struct device *dev;
+
+ struct regmap *regmap;
+ struct clk *clk_bus;
+ struct clk *clk_mod;
+ struct reset_control *reset;
+ struct phy *dphy;
+
+ struct sun6i_mipi_csi2_bridge bridge;
+};
+
+#endif
diff --git a/drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2_reg.h b/drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2_reg.h
new file mode 100644
index 000000000000..aafda934f5ef
--- /dev/null
+++ b/drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2_reg.h
@@ -0,0 +1,82 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2020-2021 Bootlin
+ * Author: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
+ */
+
+#ifndef _SUN6I_MIPI_CSI2_REG_H_
+#define _SUN6I_MIPI_CSI2_REG_H_
+
+#define SUN6I_MIPI_CSI2_CTL_REG 0x0
+#define SUN6I_MIPI_CSI2_CTL_RESET_N BIT(31)
+#define SUN6I_MIPI_CSI2_CTL_VERSION_EN BIT(30)
+#define SUN6I_MIPI_CSI2_CTL_UNPK_EN BIT(1)
+#define SUN6I_MIPI_CSI2_CTL_EN BIT(0)
+
+#define SUN6I_MIPI_CSI2_CFG_REG 0x4
+#define SUN6I_MIPI_CSI2_CFG_CHANNEL_MODE(v) ((((v) - 1) << 8) & \
+ GENMASK(9, 8))
+#define SUN6I_MIPI_CSI2_CFG_LANE_COUNT(v) (((v) - 1) & GENMASK(1, 0))
+
+#define SUN6I_MIPI_CSI2_VCDT_RX_REG 0x8
+#define SUN6I_MIPI_CSI2_VCDT_RX_CH_VC(ch, vc) (((vc) & GENMASK(1, 0)) << \
+ ((ch) * 8 + 6))
+#define SUN6I_MIPI_CSI2_VCDT_RX_CH_DT(ch, t) (((t) & GENMASK(5, 0)) << \
+ ((ch) * 8))
+#define SUN6I_MIPI_CSI2_RX_PKT_NUM_REG 0xc
+
+#define SUN6I_MIPI_CSI2_VERSION_REG 0x3c
+
+#define SUN6I_MIPI_CSI2_CH_CFG_REG 0x40
+#define SUN6I_MIPI_CSI2_CH_INT_EN_REG 0x50
+#define SUN6I_MIPI_CSI2_CH_INT_EN_EOT_ERR BIT(29)
+#define SUN6I_MIPI_CSI2_CH_INT_EN_CHKSUM_ERR BIT(28)
+#define SUN6I_MIPI_CSI2_CH_INT_EN_ECC_WRN BIT(27)
+#define SUN6I_MIPI_CSI2_CH_INT_EN_ECC_ERR BIT(26)
+#define SUN6I_MIPI_CSI2_CH_INT_EN_LINE_SYNC_ERR BIT(25)
+#define SUN6I_MIPI_CSI2_CH_INT_EN_FRAME_SYNC_ERR BIT(24)
+#define SUN6I_MIPI_CSI2_CH_INT_EN_EMB_DATA BIT(18)
+#define SUN6I_MIPI_CSI2_CH_INT_EN_PF BIT(17)
+#define SUN6I_MIPI_CSI2_CH_INT_EN_PH_UPDATE BIT(16)
+#define SUN6I_MIPI_CSI2_CH_INT_EN_LINE_START_SYNC BIT(11)
+#define SUN6I_MIPI_CSI2_CH_INT_EN_LINE_END_SYNC BIT(10)
+#define SUN6I_MIPI_CSI2_CH_INT_EN_FRAME_START_SYNC BIT(9)
+#define SUN6I_MIPI_CSI2_CH_INT_EN_FRAME_END_SYNC BIT(8)
+#define SUN6I_MIPI_CSI2_CH_INT_EN_FIFO_OVER BIT(0)
+
+#define SUN6I_MIPI_CSI2_CH_INT_PD_REG 0x58
+#define SUN6I_MIPI_CSI2_CH_INT_PD_CLEAR 0xff
+#define SUN6I_MIPI_CSI2_CH_INT_PD_EOT_ERR BIT(29)
+#define SUN6I_MIPI_CSI2_CH_INT_PD_CHKSUM_ERR BIT(28)
+#define SUN6I_MIPI_CSI2_CH_INT_PD_ECC_WRN BIT(27)
+#define SUN6I_MIPI_CSI2_CH_INT_PD_ECC_ERR BIT(26)
+#define SUN6I_MIPI_CSI2_CH_INT_PD_LINE_SYNC_ERR BIT(25)
+#define SUN6I_MIPI_CSI2_CH_INT_PD_FRAME_SYNC_ERR BIT(24)
+#define SUN6I_MIPI_CSI2_CH_INT_PD_EMB_DATA BIT(18)
+#define SUN6I_MIPI_CSI2_CH_INT_PD_PF BIT(17)
+#define SUN6I_MIPI_CSI2_CH_INT_PD_PH_UPDATE BIT(16)
+#define SUN6I_MIPI_CSI2_CH_INT_PD_LINE_START_SYNC BIT(11)
+#define SUN6I_MIPI_CSI2_CH_INT_PD_LINE_END_SYNC BIT(10)
+#define SUN6I_MIPI_CSI2_CH_INT_PD_FRAME_START_SYNC BIT(9)
+#define SUN6I_MIPI_CSI2_CH_INT_PD_FRAME_END_SYNC BIT(8)
+#define SUN6I_MIPI_CSI2_CH_INT_PD_FIFO_OVER BIT(0)
+
+#define SUN6I_MIPI_CSI2_CH_DT_TRIGGER_REG 0x60
+#define SUN6I_MIPI_CSI2_CH_CUR_PH_REG 0x70
+#define SUN6I_MIPI_CSI2_CH_ECC_REG 0x74
+#define SUN6I_MIPI_CSI2_CH_CKS_REG 0x78
+#define SUN6I_MIPI_CSI2_CH_FRAME_NUM_REG 0x7c
+#define SUN6I_MIPI_CSI2_CH_LINE_NUM_REG 0x80
+
+#define SUN6I_MIPI_CSI2_CH_OFFSET 0x100
+
+#define SUN6I_MIPI_CSI2_CH_REG(reg, ch) \
+ (SUN6I_MIPI_CSI2_CH_OFFSET * (ch) + (reg))
+
+enum mipi_csi2_data_type {
+ MIPI_CSI2_DATA_TYPE_RAW8 = 0x2a,
+ MIPI_CSI2_DATA_TYPE_RAW10 = 0x2b,
+ MIPI_CSI2_DATA_TYPE_RAW12 = 0x2c,
+};
+
+#endif
--
2.32.0