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Subject[PATCH v4 09/15] media: sunxi: Add support for the A31 MIPI CSI-2 controller
Date
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>
---
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 | 590 ++++++++++++++++++
.../sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.h | 117 ++++
6 files changed, 725 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

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..87307beda4cf
--- /dev/null
+++ b/drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.c
@@ -0,0 +1,590 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2020 Bootlin
+ * Author: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/interrupt.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"
+
+#define MODULE_NAME "sun6i-mipi-csi2"
+
+static const u32 sun6i_mipi_csi2_mbus_codes[] = {
+ MEDIA_BUS_FMT_SBGGR8_1X8,
+ MEDIA_BUS_FMT_SGBRG8_1X8,
+ MEDIA_BUS_FMT_SGRBG8_1X8,
+ MEDIA_BUS_FMT_SRGGB8_1X8,
+ MEDIA_BUS_FMT_SBGGR10_1X10,
+ MEDIA_BUS_FMT_SGBRG10_1X10,
+ MEDIA_BUS_FMT_SGRBG10_1X10,
+ MEDIA_BUS_FMT_SRGGB10_1X10,
+};
+
+/* Video */
+
+static int sun6i_mipi_csi2_s_stream(struct v4l2_subdev *subdev, int on)
+{
+ struct sun6i_mipi_csi2_video *video =
+ sun6i_mipi_csi2_subdev_video(subdev);
+ struct sun6i_mipi_csi2_dev *cdev = sun6i_mipi_csi2_video_dev(video);
+ struct v4l2_subdev *remote_subdev = video->remote_subdev;
+ struct v4l2_fwnode_bus_mipi_csi2 *bus_mipi_csi2 =
+ &video->endpoint.bus.mipi_csi2;
+ union phy_configure_opts dphy_opts = { 0 };
+ struct phy_configure_opts_mipi_dphy *dphy_cfg = &dphy_opts.mipi_dphy;
+ struct regmap *regmap = cdev->regmap;
+ struct v4l2_ctrl *ctrl;
+ unsigned int lanes_count;
+ unsigned int bpp;
+ unsigned long pixel_rate;
+ u8 data_type = 0;
+ u32 version = 0;
+ /* Initialize to 0 to use both in disable label (ret != 0) and off. */
+ int ret = 0;
+
+ if (!remote_subdev)
+ return -ENODEV;
+
+ if (!on) {
+ v4l2_subdev_call(remote_subdev, video, s_stream, 0);
+ goto disable;
+ }
+
+ switch (video->mbus_format.code) {
+ case MEDIA_BUS_FMT_SBGGR8_1X8:
+ case MEDIA_BUS_FMT_SGBRG8_1X8:
+ case MEDIA_BUS_FMT_SGRBG8_1X8:
+ case MEDIA_BUS_FMT_SRGGB8_1X8:
+ data_type = MIPI_CSI2_DATA_TYPE_RAW8;
+ bpp = 8;
+ break;
+ case MEDIA_BUS_FMT_SBGGR10_1X10:
+ case MEDIA_BUS_FMT_SGBRG10_1X10:
+ case MEDIA_BUS_FMT_SGRBG10_1X10:
+ case MEDIA_BUS_FMT_SRGGB10_1X10:
+ data_type = MIPI_CSI2_DATA_TYPE_RAW10;
+ bpp = 10;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* Sensor pixel rate */
+
+ ctrl = v4l2_ctrl_find(remote_subdev->ctrl_handler, V4L2_CID_PIXEL_RATE);
+ if (!ctrl) {
+ dev_err(cdev->dev,
+ "%s: no MIPI CSI-2 pixel rate from the sensor\n",
+ __func__);
+ return -ENODEV;
+ }
+
+ pixel_rate = (unsigned long)v4l2_ctrl_g_ctrl_int64(ctrl);
+ if (!pixel_rate) {
+ dev_err(cdev->dev,
+ "%s: zero MIPI CSI-2 pixel rate from the sensor\n",
+ __func__);
+ return -ENODEV;
+ }
+
+ /* Power management */
+
+ ret = pm_runtime_get_sync(cdev->dev);
+ if (ret < 0) {
+ pm_runtime_put_noidle(cdev->dev);
+ return ret;
+ }
+
+ /* D-PHY configuration */
+
+ lanes_count = bus_mipi_csi2->num_data_lanes;
+ phy_mipi_dphy_get_default_config(pixel_rate, 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(cdev->dev, "A31 MIPI CSI-2 config:\n");
+ dev_dbg(cdev->dev, "%ld pixels/s, %u bits/pixel, %lu Hz clock\n",
+ pixel_rate, bpp, dphy_cfg->hs_clk_rate / 2);
+
+ ret = phy_reset(cdev->dphy);
+ if (ret) {
+ dev_err(cdev->dev, "failed to reset MIPI D-PHY\n");
+ goto error_pm;
+ }
+
+ ret = phy_set_mode_ext(cdev->dphy, PHY_MODE_MIPI_DPHY,
+ PHY_MIPI_DPHY_SUBMODE_RX);
+ if (ret) {
+ dev_err(cdev->dev, "failed to set MIPI D-PHY mode\n");
+ goto error_pm;
+ }
+
+ ret = phy_configure(cdev->dphy, &dphy_opts);
+ if (ret) {
+ dev_err(cdev->dev, "failed to configure MIPI D-PHY\n");
+ goto error_pm;
+ }
+
+ ret = phy_power_on(cdev->dphy);
+ if (ret) {
+ dev_err(cdev->dev, "failed to power on MIPI D-PHY\n");
+ goto error_pm;
+ }
+
+ /* MIPI CSI-2 controller setup */
+
+ /*
+ * 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(cdev->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));
+
+ /*
+ * Our MIPI CSI-2 controller has internal channels that can be
+ * configured to match a specific MIPI CSI-2 virtual channel and/or
+ * a specific data type. Each internal channel can be piped to an
+ * internal channel of the CSI controller.
+ *
+ * We set virtual channel numbers to all channels to make sure that
+ * virtual channel 0 goes to CSI channel 0 only.
+ */
+ 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, data_type));
+
+ regmap_update_bits(regmap, SUN6I_MIPI_CSI2_CTL_REG,
+ SUN6I_MIPI_CSI2_CTL_EN, SUN6I_MIPI_CSI2_CTL_EN);
+
+ ret = v4l2_subdev_call(remote_subdev, video, s_stream, 1);
+ if (ret)
+ goto disable;
+
+ return 0;
+
+disable:
+ regmap_update_bits(regmap, SUN6I_MIPI_CSI2_CTL_REG,
+ SUN6I_MIPI_CSI2_CTL_EN, 0);
+
+ phy_power_off(cdev->dphy);
+
+error_pm:
+ pm_runtime_put(cdev->dev);
+
+ return ret;
+}
+
+static const struct v4l2_subdev_video_ops sun6i_mipi_csi2_subdev_video_ops = {
+ .s_stream = sun6i_mipi_csi2_s_stream,
+};
+
+/* Pad */
+
+static int
+sun6i_mipi_csi2_enum_mbus_code(struct v4l2_subdev *subdev,
+ struct v4l2_subdev_pad_config *config,
+ struct v4l2_subdev_mbus_code_enum *code_enum)
+{
+ if (code_enum->index >= ARRAY_SIZE(sun6i_mipi_csi2_mbus_codes))
+ return -EINVAL;
+
+ code_enum->code = sun6i_mipi_csi2_mbus_codes[code_enum->index];
+
+ return 0;
+}
+
+static int sun6i_mipi_csi2_get_fmt(struct v4l2_subdev *subdev,
+ struct v4l2_subdev_pad_config *config,
+ struct v4l2_subdev_format *format)
+{
+ struct sun6i_mipi_csi2_video *video =
+ sun6i_mipi_csi2_subdev_video(subdev);
+ struct v4l2_mbus_framefmt *mbus_format = &format->format;
+
+ if (format->which == V4L2_SUBDEV_FORMAT_TRY)
+ *mbus_format = *v4l2_subdev_get_try_format(subdev, config,
+ format->pad);
+ else
+ *mbus_format = video->mbus_format;
+
+ return 0;
+}
+
+static int sun6i_mipi_csi2_set_fmt(struct v4l2_subdev *subdev,
+ struct v4l2_subdev_pad_config *config,
+ struct v4l2_subdev_format *format)
+{
+ struct sun6i_mipi_csi2_video *video =
+ sun6i_mipi_csi2_subdev_video(subdev);
+ struct v4l2_mbus_framefmt *mbus_format = &format->format;
+
+ if (format->which == V4L2_SUBDEV_FORMAT_TRY)
+ *v4l2_subdev_get_try_format(subdev, config, format->pad) =
+ *mbus_format;
+ else
+ video->mbus_format = *mbus_format;
+
+ return 0;
+}
+
+static const struct v4l2_subdev_pad_ops sun6i_mipi_csi2_subdev_pad_ops = {
+ .enum_mbus_code = sun6i_mipi_csi2_enum_mbus_code,
+ .get_fmt = sun6i_mipi_csi2_get_fmt,
+ .set_fmt = sun6i_mipi_csi2_set_fmt,
+};
+
+/* Subdev */
+
+static const struct v4l2_subdev_ops sun6i_mipi_csi2_subdev_ops = {
+ .video = &sun6i_mipi_csi2_subdev_video_ops,
+ .pad = &sun6i_mipi_csi2_subdev_pad_ops,
+};
+
+/* Notifier */
+
+static int
+sun6i_mipi_csi2_notifier_bound(struct v4l2_async_notifier *notifier,
+ struct v4l2_subdev *remote_subdev,
+ struct v4l2_async_subdev *remote_subdev_async)
+{
+ struct v4l2_subdev *subdev = notifier->sd;
+ struct sun6i_mipi_csi2_video *video =
+ sun6i_mipi_csi2_subdev_video(subdev);
+ struct sun6i_mipi_csi2_dev *cdev = sun6i_mipi_csi2_video_dev(video);
+ int source_pad;
+ int ret;
+
+ source_pad = media_entity_get_fwnode_pad(&remote_subdev->entity,
+ remote_subdev->fwnode,
+ MEDIA_PAD_FL_SOURCE);
+ if (source_pad < 0)
+ return source_pad;
+
+ ret = media_create_pad_link(&remote_subdev->entity, source_pad,
+ &subdev->entity, 0,
+ MEDIA_LNK_FL_ENABLED |
+ MEDIA_LNK_FL_IMMUTABLE);
+ if (ret) {
+ dev_err(cdev->dev, "failed to create %s:%u -> %s:%u link\n",
+ remote_subdev->entity.name, source_pad,
+ subdev->entity.name, 0);
+ return ret;
+ }
+
+ video->remote_subdev = remote_subdev;
+
+ return 0;
+}
+
+static const
+struct v4l2_async_notifier_operations sun6i_mipi_csi2_notifier_ops = {
+ .bound = sun6i_mipi_csi2_notifier_bound,
+};
+
+/* Media Entity */
+
+static const struct media_entity_operations sun6i_mipi_csi2_entity_ops = {
+ .link_validate = v4l2_subdev_link_validate,
+};
+
+/* Base Driver */
+
+static int sun6i_mipi_csi2_suspend(struct device *dev)
+{
+ struct sun6i_mipi_csi2_dev *cdev = dev_get_drvdata(dev);
+
+ clk_disable_unprepare(cdev->clk_mod);
+ clk_disable_unprepare(cdev->clk_bus);
+ reset_control_assert(cdev->reset);
+
+ return 0;
+}
+
+static int sun6i_mipi_csi2_resume(struct device *dev)
+{
+ struct sun6i_mipi_csi2_dev *cdev = dev_get_drvdata(dev);
+ int ret;
+
+ ret = reset_control_deassert(cdev->reset);
+ if (ret) {
+ dev_err(cdev->dev, "failed to deassert reset\n");
+ return ret;
+ }
+
+ ret = clk_prepare_enable(cdev->clk_bus);
+ if (ret) {
+ dev_err(cdev->dev, "failed to enable bus clock\n");
+ goto error_reset;
+ }
+
+ ret = clk_prepare_enable(cdev->clk_mod);
+ if (ret) {
+ dev_err(cdev->dev, "failed to enable module clock\n");
+ goto error_clk_bus;
+ }
+
+ return 0;
+
+error_clk_bus:
+ clk_disable_unprepare(cdev->clk_bus);
+
+error_reset:
+ reset_control_assert(cdev->reset);
+
+ return ret;
+}
+
+static int sun6i_mipi_csi2_v4l2_setup(struct sun6i_mipi_csi2_dev *cdev)
+{
+ struct sun6i_mipi_csi2_video *video = &cdev->video;
+ struct v4l2_subdev *subdev = &video->subdev;
+ struct v4l2_async_notifier *notifier = &video->notifier;
+ struct fwnode_handle *handle;
+ struct v4l2_fwnode_endpoint *endpoint;
+ struct v4l2_async_subdev *subdev_async;
+ int ret;
+
+ /* Subdev */
+
+ v4l2_subdev_init(subdev, &sun6i_mipi_csi2_subdev_ops);
+ subdev->dev = cdev->dev;
+ subdev->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+ strscpy(subdev->name, MODULE_NAME, sizeof(subdev->name));
+ v4l2_set_subdevdata(subdev, cdev);
+
+ /* Entity */
+
+ subdev->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
+ subdev->entity.ops = &sun6i_mipi_csi2_entity_ops;
+
+ /* Pads */
+
+ video->pads[0].flags = MEDIA_PAD_FL_SINK;
+ video->pads[1].flags = MEDIA_PAD_FL_SOURCE;
+
+ ret = media_entity_pads_init(&subdev->entity, 2, video->pads);
+ if (ret)
+ return ret;
+
+ /* Endpoint */
+
+ handle = fwnode_graph_get_endpoint_by_id(dev_fwnode(cdev->dev), 0, 0,
+ FWNODE_GRAPH_ENDPOINT_NEXT);
+ if (!handle) {
+ ret = -ENODEV;
+ goto error_media_entity;
+ }
+
+ endpoint = &video->endpoint;
+ endpoint->bus_type = V4L2_MBUS_CSI2_DPHY;
+
+ ret = v4l2_fwnode_endpoint_parse(handle, endpoint);
+ fwnode_handle_put(handle);
+ if (ret)
+ goto error_media_entity;
+
+ /* Notifier */
+
+ v4l2_async_notifier_init(notifier);
+
+ subdev_async = &video->subdev_async;
+ ret = v4l2_async_notifier_add_fwnode_remote_subdev(notifier, handle,
+ subdev_async);
+ if (ret)
+ goto error_media_entity;
+
+ video->notifier.ops = &sun6i_mipi_csi2_notifier_ops;
+
+ ret = v4l2_async_subdev_notifier_register(subdev, notifier);
+ if (ret < 0)
+ goto error_notifier;
+
+ /* Subdev */
+
+ ret = v4l2_async_register_subdev(subdev);
+ if (ret < 0)
+ goto error_notifier_registered;
+
+ /* Runtime PM */
+
+ pm_runtime_enable(cdev->dev);
+ pm_runtime_set_suspended(cdev->dev);
+
+ return 0;
+
+error_notifier_registered:
+ v4l2_async_notifier_unregister(notifier);
+error_notifier:
+ v4l2_async_notifier_cleanup(notifier);
+error_media_entity:
+ media_entity_cleanup(&subdev->entity);
+
+ return ret;
+}
+
+static int sun6i_mipi_csi2_v4l2_teardown(struct sun6i_mipi_csi2_dev *cdev)
+{
+ struct sun6i_mipi_csi2_video *video = &cdev->video;
+ struct v4l2_subdev *subdev = &video->subdev;
+ struct v4l2_async_notifier *notifier = &video->notifier;
+
+ v4l2_async_unregister_subdev(subdev);
+ v4l2_async_notifier_unregister(notifier);
+ v4l2_async_notifier_cleanup(notifier);
+ media_entity_cleanup(&subdev->entity);
+ v4l2_device_unregister_subdev(subdev);
+
+ return 0;
+}
+
+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_probe(struct platform_device *pdev)
+{
+ struct sun6i_mipi_csi2_dev *cdev;
+ struct resource *res;
+ void __iomem *io_base;
+ int ret;
+
+ cdev = devm_kzalloc(&pdev->dev, sizeof(*cdev), GFP_KERNEL);
+ if (!cdev)
+ return -ENOMEM;
+
+ cdev->dev = &pdev->dev;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ io_base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(io_base))
+ return PTR_ERR(io_base);
+
+ cdev->regmap = devm_regmap_init_mmio(&pdev->dev, io_base,
+ &sun6i_mipi_csi2_regmap_config);
+ if (IS_ERR(cdev->regmap)) {
+ dev_err(&pdev->dev, "failed to init register map\n");
+ return PTR_ERR(cdev->regmap);
+ }
+
+ cdev->clk_bus = devm_clk_get(&pdev->dev, "bus");
+ if (IS_ERR(cdev->clk_bus)) {
+ dev_err(&pdev->dev, "failed to acquire bus clock\n");
+ return PTR_ERR(cdev->clk_bus);
+ }
+
+ cdev->clk_mod = devm_clk_get(&pdev->dev, "mod");
+ if (IS_ERR(cdev->clk_mod)) {
+ dev_err(&pdev->dev, "failed to acquire mod clock\n");
+ return PTR_ERR(cdev->clk_mod);
+ }
+
+ cdev->reset = devm_reset_control_get_shared(&pdev->dev, NULL);
+ if (IS_ERR(cdev->reset)) {
+ dev_err(&pdev->dev, "failed to get reset controller\n");
+ return PTR_ERR(cdev->reset);
+ }
+
+ cdev->dphy = devm_phy_get(&pdev->dev, NULL);
+ if (IS_ERR(cdev->dphy)) {
+ dev_err(&pdev->dev, "failed to get the MIPI D-PHY\n");
+ return PTR_ERR(cdev->dphy);
+ }
+
+ ret = phy_init(cdev->dphy);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to initialize the MIPI D-PHY\n");
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, cdev);
+
+ ret = sun6i_mipi_csi2_v4l2_setup(cdev);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int sun6i_mipi_csi2_remove(struct platform_device *pdev)
+{
+ struct sun6i_mipi_csi2_dev *cdev = platform_get_drvdata(pdev);
+
+ phy_exit(cdev->dphy);
+
+ return sun6i_mipi_csi2_v4l2_teardown(cdev);
+}
+
+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 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 = MODULE_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..0869dc7db3b5
--- /dev/null
+++ b/drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.h
@@ -0,0 +1,117 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2020 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_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_BASE 0x1000
+#define SUN6I_MIPI_CSI2_CH_OFFSET 0x100
+
+#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_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_REG(reg, ch) \
+ (SUN6I_MIPI_CSI2_CH_BASE + 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,
+};
+
+struct sun6i_mipi_csi2_video {
+ struct v4l2_fwnode_endpoint endpoint;
+ struct v4l2_subdev subdev;
+ struct media_pad pads[2];
+
+ struct v4l2_async_subdev subdev_async;
+ struct v4l2_async_notifier notifier;
+
+ struct v4l2_subdev *remote_subdev;
+
+ struct v4l2_mbus_framefmt mbus_format;
+};
+
+struct sun6i_mipi_csi2_dev {
+ 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_video video;
+};
+
+#define sun6i_mipi_csi2_subdev_video(s) \
+ container_of(s, struct sun6i_mipi_csi2_video, subdev)
+
+#define sun6i_mipi_csi2_video_dev(v) \
+ container_of(v, struct sun6i_mipi_csi2_dev, video)
+
+#endif /* __SUN6I_MIPI_CSI2_H__ */
--
2.29.2
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  Last update: 2020-12-31 15:33    [W:0.196 / U:0.916 seconds]
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