Microchip CSI2DC (CSI2 Demultiplexer Controller) is a misc bridge device that converts a byte stream in IDI Synopsys format (coming from a CSI2HOST) to a pixel stream that can be captured by a sensor controller. Signed-off-by: Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx> --- Changes in v2: - implement try formats - added parallel mode - moved to fwlink endpoints - many other minor corrections from Jacopo's review Changes in this revision: - addressed comments by Jacopo and Laurent as in this thread: https://www.spinics.net/lists/linux-media/msg181044.html Previous change log : Changes in v5: - only in bindings Changes in v4: - now using get_mbus_config ops to get data from the subdevice, like the virtual channel id, and the clock type. - now having possibility to select any of the RAW10 data modes - at completion time, select which formats are also available in the subdevice, and move to the dynamic list accordingly - changed the pipeline integration, do not advertise subdev ready at probe time. wait until completion is done, and then start a workqueue that will register this device as a subdevice for the next element in pipeline. - moved the s_power code into a different function called now csi2dc_power that is called with CONFIG_PM functions. This is also called at completion, to have the device ready in case CONFIG_PM is not selected on the platform. - merged try_fmt into set_fmt - driver cleanup, wrapped lines over 80 characters Changes in v2: - moved driver to platform/atmel - fixed minor things as per Sakari's review - still some things from v2 review are not yet addressed, to be followed up drivers/media/platform/Makefile | 1 + drivers/media/platform/atmel/Kconfig | 15 + drivers/media/platform/atmel/Makefile | 1 + .../media/platform/atmel/microchip-csi2dc.c | 797 ++++++++++++++++++ 4 files changed, 814 insertions(+) create mode 100644 drivers/media/platform/atmel/microchip-csi2dc.c diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile index 832357240e89..b18e5f704145 100644 --- a/drivers/media/platform/Makefile +++ b/drivers/media/platform/Makefile @@ -69,6 +69,7 @@ obj-$(CONFIG_VIDEO_RCAR_VIN) += rcar-vin/ obj-$(CONFIG_VIDEO_ATMEL_ISC) += atmel/ obj-$(CONFIG_VIDEO_ATMEL_ISI) += atmel/ obj-$(CONFIG_VIDEO_ATMEL_XISC) += atmel/ +obj-$(CONFIG_VIDEO_MICROCHIP_CSI2DC) += atmel/ obj-$(CONFIG_VIDEO_STM32_DCMI) += stm32/ diff --git a/drivers/media/platform/atmel/Kconfig b/drivers/media/platform/atmel/Kconfig index dda2f27da317..f83bee373d82 100644 --- a/drivers/media/platform/atmel/Kconfig +++ b/drivers/media/platform/atmel/Kconfig @@ -40,3 +40,18 @@ config VIDEO_ATMEL_ISI help This module makes the ATMEL Image Sensor Interface available as a v4l2 device. + +config VIDEO_MICROCHIP_CSI2DC + tristate "Microchip CSI2 Demux Controller" + depends on VIDEO_V4L2 && COMMON_CLK && OF + depends on ARCH_AT91 || COMPILE_TEST + select MEDIA_CONTROLLER + select VIDEO_V4L2_SUBDEV_API + select V4L2_FWNODE + help + CSI2 Demux Controller driver. CSI2DC is a helper chip + that converts IDI interface byte stream to a parallel pixel stream. + It supports various RAW formats as input. + + To compile this driver as a module, choose M here: the + module will be called microchip-csi2dc. diff --git a/drivers/media/platform/atmel/Makefile b/drivers/media/platform/atmel/Makefile index 46d264ab7948..39f0a7eba702 100644 --- a/drivers/media/platform/atmel/Makefile +++ b/drivers/media/platform/atmel/Makefile @@ -6,3 +6,4 @@ obj-$(CONFIG_VIDEO_ATMEL_ISI) += atmel-isi.o obj-$(CONFIG_VIDEO_ATMEL_ISC_BASE) += atmel-isc-base.o obj-$(CONFIG_VIDEO_ATMEL_ISC) += atmel-isc.o obj-$(CONFIG_VIDEO_ATMEL_XISC) += atmel-xisc.o +obj-$(CONFIG_VIDEO_MICROCHIP_CSI2DC) += microchip-csi2dc.o diff --git a/drivers/media/platform/atmel/microchip-csi2dc.c b/drivers/media/platform/atmel/microchip-csi2dc.c new file mode 100644 index 000000000000..2b106f6fd5d0 --- /dev/null +++ b/drivers/media/platform/atmel/microchip-csi2dc.c @@ -0,0 +1,797 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Microchip CSI2 Demux Controller (CSI2DC) driver + * + * Copyright (C) 2018 Microchip Technology, Inc. + * + * Author: Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx> + * + */ + +#include <linux/clk.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/of_graph.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/videodev2.h> + +#include <media/v4l2-fwnode.h> +#include <media/v4l2-subdev.h> + +/* Global configuration register */ +#define CSI2DC_GCFG 0x0 + +/* MIPI sensor pixel clock is free running */ +#define CSI2DC_GCFG_MIPIFRN BIT(0) +/* GPIO parallel interface selection */ +#define CSI2DC_GCFG_GPIOSEL BIT(1) +/* Output waveform inter-line minimum delay */ +#define CSI2DC_GCFG_HLC(v) ((v) << 4) +#define CSI2DC_GCFG_HLC_MASK GENMASK(7, 4) +/* SAMA7G5 requires a HLC delay of 15 */ +#define SAMA7G5_HLC (15) + +/* Global control register */ +#define CSI2DC_GCTLR 0x04 +#define CSI2DC_GCTLR_SWRST BIT(0) + +/* Global status register */ +#define CSI2DC_GS 0x08 + +/* SSP interrupt status register */ +#define CSI2DC_SSPIS 0x28 +/* Pipe update register */ +#define CSI2DC_PU 0xc0 +/* Video pipe attributes update */ +#define CSI2DC_PU_VP BIT(0) + +/* Pipe update status register */ +#define CSI2DC_PUS 0xc4 + +/* Video pipeline enable register */ +#define CSI2DC_VPE 0xf8 +#define CSI2DC_VPE_ENABLE BIT(0) + +/* Video pipeline configuration register */ +#define CSI2DC_VPCFG 0xfc +/* Data type */ +#define CSI2DC_VPCFG_DT(v) ((v) << 0) +#define CSI2DC_VPCFG_DT_MASK GENMASK(5, 0) +/* Virtual channel identifier */ +#define CSI2DC_VPCFG_VC(v) ((v) << 6) +#define CSI2DC_VPCFG_VC_MASK GENMASK(7, 6) +/* Decompression enable */ +#define CSI2DC_VPCFG_DE BIT(8) +/* Decoder mode */ +#define CSI2DC_VPCFG_DM(v) ((v) << 9) +#define CSI2DC_VPCFG_DM_DECODER8TO12 0 +/* Decoder predictor 2 selection */ +#define CSI2DC_VPCFG_DP2 BIT(12) +/* Recommended memory storage */ +#define CSI2DC_VPCFG_RMS BIT(13) +/* Post adjustment */ +#define CSI2DC_VPCFG_PA BIT(14) + +/* Video pipeline column register */ +#define CSI2DC_VPCOL 0x100 +/* Column number */ +#define CSI2DC_VPCOL_COL(v) ((v) << 0) +#define CSI2DC_VPCOL_COL_MASK GENMASK(15, 0) + +/* Video pipeline row register */ +#define CSI2DC_VPROW 0x104 +/* Row number */ +#define CSI2DC_VPROW_ROW(v) ((v) << 0) +#define CSI2DC_VPROW_ROW_MASK GENMASK(15, 0) + +/* Version register */ +#define CSI2DC_VERSION 0x1fc + +/* register read/write helpers */ +#define csi2dc_readl(st, reg) readl_relaxed((st)->base + (reg)) +#define csi2dc_writel(st, reg, val) writel_relaxed((val), \ + (st)->base + (reg)) + +/* supported RAW data types */ +#define CSI2DC_DT_RAW6 0x28 +#define CSI2DC_DT_RAW7 0x29 +#define CSI2DC_DT_RAW8 0x2a +#define CSI2DC_DT_RAW10 0x2b +#define CSI2DC_DT_RAW12 0x2c +#define CSI2DC_DT_RAW14 0x2d + +/* + * struct csi2dc_format - CSI2DC format type struct + * @mbus_code: Media bus code for the format + * @dt: Data type constant for this format + */ +struct csi2dc_format { + u32 mbus_code; + u32 dt; +}; + +static const struct csi2dc_format csi2dc_formats[] = { + { + .mbus_code = MEDIA_BUS_FMT_SRGGB8_1X8, + .dt = CSI2DC_DT_RAW8, + }, { + .mbus_code = MEDIA_BUS_FMT_SBGGR8_1X8, + .dt = CSI2DC_DT_RAW8, + }, { + .mbus_code = MEDIA_BUS_FMT_SGRBG8_1X8, + .dt = CSI2DC_DT_RAW8, + }, { + .mbus_code = MEDIA_BUS_FMT_SGBRG8_1X8, + .dt = CSI2DC_DT_RAW8, + }, { + .mbus_code = MEDIA_BUS_FMT_SRGGB10_1X10, + .dt = CSI2DC_DT_RAW10, + }, { + .mbus_code = MEDIA_BUS_FMT_SBGGR10_1X10, + .dt = CSI2DC_DT_RAW10, + }, { + .mbus_code = MEDIA_BUS_FMT_SGRBG10_1X10, + .dt = CSI2DC_DT_RAW10, + }, { + .mbus_code = MEDIA_BUS_FMT_SGBRG10_1X10, + .dt = CSI2DC_DT_RAW10, + }, { + .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8, + }, +}; + +enum mipi_csi_pads { + CSI2DC_PAD_SINK = 0, + CSI2DC_PAD_SOURCE = 1, + CSI2DC_PADS_NUM = 2, +}; + +/* + * struct csi2dc_device - CSI2DC device driver data/config struct + * @base: Register map base address + * @csi2dc_sd: v4l2 subdevice for the csi2dc device + * This is the subdevice that the csi2dc device itself + * registers in v4l2 subsystem + * @dev: struct device for this csi2dc device + * @pclk: Peripheral clock reference + * Input clock that clocks the hardware block internal + * logic + * @scck: Sensor Controller clock reference + * Input clock that is used to generate the pixel clock + * @format: Current saved format used in g/s fmt + * @cur_fmt: Current state format + * @try_fmt: Try format that is being tried + * @pads: Media entity pads for the csi2dc subdevice + * @clk_gated: Whether the clock is gated or free running + * @video_pipe: Whether video pipeline is configured + * @parallel_mode: The underlying subdevice is connected on a parallel bus + * @vc: Current set virtual channel + * @notifier: Async notifier that is used to bound the underlying + * subdevice to the csi2dc subdevice + * @input_sd: Reference to the underlying subdevice bound to the + * csi2dc subdevice + * @remote_pad: Pad number of the underlying subdevice that is linked + * to the csi2dc subdevice sink pad. + */ +struct csi2dc_device { + void __iomem *base; + struct v4l2_subdev csi2dc_sd; + struct device *dev; + struct clk *pclk; + struct clk *scck; + + struct v4l2_mbus_framefmt format; + + const struct csi2dc_format *cur_fmt; + const struct csi2dc_format *try_fmt; + + struct media_pad pads[CSI2DC_PADS_NUM]; + + bool clk_gated; + bool video_pipe; + bool parallel_mode; + u32 vc; + + struct v4l2_async_notifier notifier; + + struct v4l2_subdev *input_sd; + + u32 remote_pad; +}; + +static inline struct csi2dc_device * +csi2dc_sd_to_csi2dc_device(struct v4l2_subdev *csi2dc_sd) +{ + return container_of(csi2dc_sd, struct csi2dc_device, csi2dc_sd); +} + +static int csi2dc_enum_mbus_code(struct v4l2_subdev *csi2dc_sd, + struct v4l2_subdev_state *sd_state, + struct v4l2_subdev_mbus_code_enum *code) +{ + if (code->index >= ARRAY_SIZE(csi2dc_formats)) + return -EINVAL; + + code->code = csi2dc_formats[code->index].mbus_code; + + return 0; +} + +static int csi2dc_get_fmt(struct v4l2_subdev *csi2dc_sd, + struct v4l2_subdev_state *sd_state, + struct v4l2_subdev_format *format) +{ + struct csi2dc_device *csi2dc = csi2dc_sd_to_csi2dc_device(csi2dc_sd); + struct v4l2_mbus_framefmt *v4l2_try_fmt; + + if (format->which == V4L2_SUBDEV_FORMAT_TRY) { + v4l2_try_fmt = v4l2_subdev_get_try_format(csi2dc_sd, sd_state, + format->pad); + format->format = *v4l2_try_fmt; + + return 0; + } + + format->format = csi2dc->format; + + return 0; +} + +static int csi2dc_set_fmt(struct v4l2_subdev *csi2dc_sd, + struct v4l2_subdev_state *sd_state, + struct v4l2_subdev_format *req_fmt) +{ + struct csi2dc_device *csi2dc = csi2dc_sd_to_csi2dc_device(csi2dc_sd); + const struct csi2dc_format *fmt, *try_fmt = NULL; + struct v4l2_mbus_framefmt *v4l2_try_fmt; + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(csi2dc_formats); i++) { + fmt = &csi2dc_formats[i]; + if (req_fmt->format.code == fmt->mbus_code) + try_fmt = fmt; + fmt++; + } + + /* in case we could not find the desired format, default to something */ + if (!try_fmt) { + try_fmt = &csi2dc_formats[0]; + + dev_dbg(csi2dc->dev, + "CSI2DC unsupported format 0x%x, defaulting to 0x%x\n", + req_fmt->format.code, csi2dc_formats[0].mbus_code); + } + + req_fmt->format.code = try_fmt->mbus_code; + req_fmt->format.colorspace = V4L2_COLORSPACE_SRGB; + req_fmt->format.field = V4L2_FIELD_NONE; + + if (req_fmt->which == V4L2_SUBDEV_FORMAT_TRY) { + v4l2_try_fmt = v4l2_subdev_get_try_format(csi2dc_sd, sd_state, + req_fmt->pad); + *v4l2_try_fmt = req_fmt->format; + /* Trying on the pad sink makes the source sink change too */ + if (req_fmt->pad == CSI2DC_PAD_SINK) { + v4l2_try_fmt = + v4l2_subdev_get_try_format(csi2dc_sd, + sd_state, + CSI2DC_PAD_SOURCE); + *v4l2_try_fmt = req_fmt->format; + } + /* if we are just trying, we are done */ + return 0; + } + + /* save the format for later requests */ + csi2dc->format = req_fmt->format; + + /* update config */ + csi2dc->cur_fmt = try_fmt; + + dev_dbg(csi2dc->dev, "new format set: 0x%x @%dx%d\n", + csi2dc->format.code, csi2dc->format.width, + csi2dc->format.height); + + return 0; +} + +static int csi2dc_power(struct csi2dc_device *csi2dc, int on) +{ + int ret = 0; + + if (on) { + ret = clk_prepare_enable(csi2dc->pclk); + if (ret) { + dev_err(csi2dc->dev, "failed to enable pclk:%d\n", ret); + return ret; + } + + ret = clk_prepare_enable(csi2dc->scck); + if (ret) { + dev_err(csi2dc->dev, "failed to enable scck:%d\n", ret); + clk_disable_unprepare(csi2dc->pclk); + return ret; + } + + /* if powering up, deassert reset line */ + csi2dc_writel(csi2dc, CSI2DC_GCTLR, CSI2DC_GCTLR_SWRST); + } else { + /* if powering down, assert reset line */ + csi2dc_writel(csi2dc, CSI2DC_GCTLR, 0); + + clk_disable_unprepare(csi2dc->scck); + clk_disable_unprepare(csi2dc->pclk); + } + + return ret; +} + +static int csi2dc_get_mbus_config(struct csi2dc_device *csi2dc) +{ + struct v4l2_mbus_config mbus_config = { 0 }; + int ret; + + ret = v4l2_subdev_call(csi2dc->input_sd, pad, get_mbus_config, + csi2dc->remote_pad, &mbus_config); + if (ret == -ENOIOCTLCMD) { + dev_dbg(csi2dc->dev, + "no remote mbus configuration available\n"); + goto csi2dc_get_mbus_config_defaults; + } + + if (ret) { + dev_err(csi2dc->dev, + "failed to get remote mbus configuration\n"); + goto csi2dc_get_mbus_config_defaults; + } + + if (mbus_config.flags & V4L2_MBUS_CSI2_CHANNEL_0) + csi2dc->vc = 0; + else if (mbus_config.flags & V4L2_MBUS_CSI2_CHANNEL_1) + csi2dc->vc = 1; + else if (mbus_config.flags & V4L2_MBUS_CSI2_CHANNEL_2) + csi2dc->vc = 2; + else if (mbus_config.flags & V4L2_MBUS_CSI2_CHANNEL_3) + csi2dc->vc = 3; + + dev_dbg(csi2dc->dev, "subdev sending on channel %d\n", csi2dc->vc); + + csi2dc->clk_gated = mbus_config.flags & + V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK; + + dev_dbg(csi2dc->dev, "mbus_config: %s clock\n", + csi2dc->clk_gated ? "gated" : "free running"); + + return 0; + +csi2dc_get_mbus_config_defaults: + csi2dc->vc = 0; /* Virtual ID 0 by default */ + + return 0; +} + +static void csi2dc_vp_update(struct csi2dc_device *csi2dc) +{ + u32 vp, gcfg; + + if (!csi2dc->video_pipe) { + dev_err(csi2dc->dev, "video pipeline unavailable\n"); + return; + } + + if (csi2dc->parallel_mode) { + /* In parallel mode, GPIO parallel interface must be selected */ + gcfg = csi2dc_readl(csi2dc, CSI2DC_GCFG); + gcfg |= CSI2DC_GCFG_GPIOSEL; + csi2dc_writel(csi2dc, CSI2DC_GCFG, gcfg); + return; + } + + /* serial video pipeline */ + + csi2dc_writel(csi2dc, CSI2DC_GCFG, + (SAMA7G5_HLC & CSI2DC_GCFG_HLC_MASK) | + (csi2dc->clk_gated ? 0 : CSI2DC_GCFG_MIPIFRN)); + + csi2dc_writel(csi2dc, CSI2DC_VPCOL, + CSI2DC_VPCOL_COL(0xfff) & CSI2DC_VPCOL_COL_MASK); + csi2dc_writel(csi2dc, CSI2DC_VPROW, + CSI2DC_VPROW_ROW(0xfff) & CSI2DC_VPROW_ROW_MASK); + + vp = CSI2DC_VPCFG_DT(csi2dc->cur_fmt->dt) & CSI2DC_VPCFG_DT_MASK; + vp |= CSI2DC_VPCFG_VC(csi2dc->vc) & CSI2DC_VPCFG_VC_MASK; + vp &= ~CSI2DC_VPCFG_DE; + vp |= CSI2DC_VPCFG_DM(CSI2DC_VPCFG_DM_DECODER8TO12); + vp &= ~CSI2DC_VPCFG_DP2; + vp &= ~CSI2DC_VPCFG_RMS; + vp |= CSI2DC_VPCFG_PA; + + csi2dc_writel(csi2dc, CSI2DC_VPCFG, vp); + csi2dc_writel(csi2dc, CSI2DC_VPE, CSI2DC_VPE_ENABLE); + csi2dc_writel(csi2dc, CSI2DC_PU, CSI2DC_PU_VP); +} + +static int csi2dc_s_stream(struct v4l2_subdev *csi2dc_sd, int enable) +{ + struct csi2dc_device *csi2dc = csi2dc_sd_to_csi2dc_device(csi2dc_sd); + int ret; + + if (enable) { + ret = pm_runtime_resume_and_get(csi2dc->dev); + if (ret < 0) + return ret; + + csi2dc_get_mbus_config(csi2dc); + + csi2dc_vp_update(csi2dc); + + return v4l2_subdev_call(csi2dc->input_sd, video, s_stream, + true); + } + /* stop streaming scenario */ + ret = v4l2_subdev_call(csi2dc->input_sd, video, s_stream, false); + + pm_runtime_put_sync(csi2dc->dev); + + return ret; +} + +static int csi2dc_init_cfg(struct v4l2_subdev *csi2dc_sd, + struct v4l2_subdev_state *sd_state) +{ + struct v4l2_mbus_framefmt *v4l2_try_fmt = + v4l2_subdev_get_try_format(csi2dc_sd, sd_state, 0); + + v4l2_try_fmt->height = 480; + v4l2_try_fmt->width = 640; + v4l2_try_fmt->code = csi2dc_formats[0].mbus_code; + v4l2_try_fmt->colorspace = V4L2_COLORSPACE_SRGB; + v4l2_try_fmt->field = V4L2_FIELD_NONE; + v4l2_try_fmt->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT; + v4l2_try_fmt->quantization = V4L2_QUANTIZATION_DEFAULT; + v4l2_try_fmt->xfer_func = V4L2_XFER_FUNC_DEFAULT; + + return 0; +} + +static const struct v4l2_subdev_pad_ops csi2dc_pad_ops = { + .enum_mbus_code = csi2dc_enum_mbus_code, + .set_fmt = csi2dc_set_fmt, + .get_fmt = csi2dc_get_fmt, + .init_cfg = csi2dc_init_cfg, +}; + +static const struct v4l2_subdev_video_ops csi2dc_video_ops = { + .s_stream = csi2dc_s_stream, +}; + +static const struct v4l2_subdev_ops csi2dc_subdev_ops = { + .pad = &csi2dc_pad_ops, + .video = &csi2dc_video_ops, +}; + +static int csi2dc_async_bound(struct v4l2_async_notifier *notifier, + struct v4l2_subdev *subdev, + struct v4l2_async_subdev *asd) +{ + struct csi2dc_device *csi2dc = container_of(notifier, + struct csi2dc_device, notifier); + int pad; + int ret; + + csi2dc->input_sd = subdev; + + pad = media_entity_get_fwnode_pad(&subdev->entity, asd->match.fwnode, + MEDIA_PAD_FL_SOURCE); + if (pad < 0) { + dev_err(csi2dc->dev, "Failed to find pad for %s\n", + subdev->name); + return pad; + } + + csi2dc->remote_pad = pad; + + ret = media_create_pad_link(&csi2dc->input_sd->entity, + csi2dc->remote_pad, + &csi2dc->csi2dc_sd.entity, 0, + MEDIA_LNK_FL_ENABLED); + if (ret) { + dev_err(csi2dc->dev, + "Failed to create pad link: %s to %s\n", + csi2dc->input_sd->entity.name, + csi2dc->csi2dc_sd.entity.name); + return ret; + } + + dev_dbg(csi2dc->dev, "link with %s pad: %d\n", + csi2dc->input_sd->name, csi2dc->remote_pad); + + return ret; +} + +static const struct v4l2_async_notifier_operations csi2dc_async_ops = { + .bound = csi2dc_async_bound, +}; + +static int csi2dc_prepare_notifier(struct csi2dc_device *csi2dc, + struct fwnode_handle *input_fwnode) +{ + struct v4l2_async_subdev *asd; + int ret = 0; + + v4l2_async_nf_init(&csi2dc->notifier); + + asd = v4l2_async_nf_add_fwnode_remote(&csi2dc->notifier, + input_fwnode, + struct v4l2_async_subdev); + + fwnode_handle_put(input_fwnode); + + if (IS_ERR(asd)) { + ret = PTR_ERR(asd); + dev_err(csi2dc->dev, + "failed to add async notifier for node %pOF: %d\n", + to_of_node(input_fwnode), ret); + v4l2_async_nf_cleanup(&csi2dc->notifier); + return ret; + } + + csi2dc->notifier.ops = &csi2dc_async_ops; + + ret = v4l2_async_subdev_nf_register(&csi2dc->csi2dc_sd, + &csi2dc->notifier); + + if (ret) { + dev_err(csi2dc->dev, "fail to register async notifier: %d\n", + ret); + v4l2_async_nf_cleanup(&csi2dc->notifier); + } + + return ret; +} + +static int csi2dc_of_parse(struct csi2dc_device *csi2dc, + struct device_node *of_node) +{ + struct fwnode_handle *input_fwnode, *output_fwnode; + struct v4l2_fwnode_endpoint input_endpoint = { 0 }, + output_endpoint = { 0 }; + int ret; + + input_fwnode = fwnode_graph_get_next_endpoint(of_fwnode_handle(of_node), + NULL); + + if (!input_fwnode) { + dev_err(csi2dc->dev, + "missing port node at %pOF, input node is mandatory.\n", + of_node); + return -EINVAL; + } + + ret = v4l2_fwnode_endpoint_parse(input_fwnode, &input_endpoint); + + if (ret) { + dev_err(csi2dc->dev, "endpoint not defined at %pOF\n", of_node); + goto csi2dc_of_parse_err; + } + + if (input_endpoint.bus_type == V4L2_MBUS_PARALLEL || + input_endpoint.bus_type == V4L2_MBUS_BT656) { + csi2dc->parallel_mode = true; + dev_dbg(csi2dc->dev, + "subdevice connected on parallel interface\n"); + } + + if (input_endpoint.bus_type == V4L2_MBUS_CSI2_DPHY) { + csi2dc->clk_gated = input_endpoint.bus.mipi_csi2.flags & + V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK; + dev_dbg(csi2dc->dev, + "subdevice connected on serial interface\n"); + dev_dbg(csi2dc->dev, "DT: %s clock\n", + csi2dc->clk_gated ? "gated" : "free running"); + } + + output_fwnode = fwnode_graph_get_next_endpoint + (of_fwnode_handle(of_node), input_fwnode); + + if (output_fwnode) + ret = v4l2_fwnode_endpoint_parse(output_fwnode, + &output_endpoint); + + fwnode_handle_put(output_fwnode); + + if (!output_fwnode || ret) { + dev_info(csi2dc->dev, + "missing output node at %pOF, data pipe available only.\n", + of_node); + } else { + if (output_endpoint.bus_type != V4L2_MBUS_PARALLEL && + output_endpoint.bus_type != V4L2_MBUS_BT656) { + dev_err(csi2dc->dev, + "output port must be parallel/bt656.\n"); + ret = -EINVAL; + goto csi2dc_of_parse_err; + } + + csi2dc->video_pipe = true; + + dev_dbg(csi2dc->dev, + "block %pOF [%d.%d]->[%d.%d] video pipeline\n", + of_node, input_endpoint.base.port, + input_endpoint.base.id, output_endpoint.base.port, + output_endpoint.base.id); + } + + /* prepare async notifier for subdevice completion */ + return csi2dc_prepare_notifier(csi2dc, input_fwnode); + +csi2dc_of_parse_err: + fwnode_handle_put(input_fwnode); + return ret; +} + +static void csi2dc_default_format(struct csi2dc_device *csi2dc) +{ + csi2dc->cur_fmt = &csi2dc_formats[0]; + + csi2dc->format.height = 480; + csi2dc->format.width = 640; + csi2dc->format.code = csi2dc_formats[0].mbus_code; + csi2dc->format.colorspace = V4L2_COLORSPACE_SRGB; + csi2dc->format.field = V4L2_FIELD_NONE; + csi2dc->format.ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT; + csi2dc->format.quantization = V4L2_QUANTIZATION_DEFAULT; + csi2dc->format.xfer_func = V4L2_XFER_FUNC_DEFAULT; +} + +static int csi2dc_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct csi2dc_device *csi2dc; + int ret = 0; + u32 ver; + + csi2dc = devm_kzalloc(dev, sizeof(*csi2dc), GFP_KERNEL); + if (!csi2dc) + return -ENOMEM; + + csi2dc->dev = dev; + + csi2dc->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(csi2dc->base)) { + dev_err(dev, "base address not set\n"); + return PTR_ERR(csi2dc->base); + } + + csi2dc->pclk = devm_clk_get(dev, "pclk"); + if (IS_ERR(csi2dc->pclk)) { + ret = PTR_ERR(csi2dc->pclk); + dev_err(dev, "failed to get pclk: %d\n", ret); + return ret; + } + + csi2dc->scck = devm_clk_get(dev, "scck"); + if (IS_ERR(csi2dc->scck)) { + ret = PTR_ERR(csi2dc->scck); + dev_err(dev, "failed to get scck: %d\n", ret); + return ret; + } + + v4l2_subdev_init(&csi2dc->csi2dc_sd, &csi2dc_subdev_ops); + + csi2dc->csi2dc_sd.owner = THIS_MODULE; + csi2dc->csi2dc_sd.dev = dev; + snprintf(csi2dc->csi2dc_sd.name, sizeof(csi2dc->csi2dc_sd.name), + "csi2dc"); + + csi2dc->csi2dc_sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; + csi2dc->csi2dc_sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE; + + platform_set_drvdata(pdev, csi2dc); + + ret = csi2dc_of_parse(csi2dc, dev->of_node); + if (ret) + goto csi2dc_probe_cleanup_entity; + + csi2dc->pads[CSI2DC_PAD_SINK].flags = MEDIA_PAD_FL_SINK; + if (csi2dc->video_pipe) + csi2dc->pads[CSI2DC_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE; + + ret = media_entity_pads_init(&csi2dc->csi2dc_sd.entity, + csi2dc->video_pipe ? CSI2DC_PADS_NUM : 1, + csi2dc->pads); + if (ret < 0) { + dev_err(dev, "media entity init failed\n"); + goto csi2dc_probe_cleanup_notifier; + } + + csi2dc_default_format(csi2dc); + + /* turn power on to validate capabilities */ + ret = csi2dc_power(csi2dc, true); + if (ret < 0) + goto csi2dc_probe_cleanup_notifier; + + pm_runtime_set_active(dev); + pm_runtime_enable(dev); + ver = csi2dc_readl(csi2dc, CSI2DC_VERSION); + pm_request_idle(dev); + + /* + * we must register the subdev after PM runtime has been requested, + * otherwise we might bound immediately and request pm_runtime_resume + * before runtime_enable. + */ + ret = v4l2_async_register_subdev(&csi2dc->csi2dc_sd); + if (ret) { + dev_err(csi2dc->dev, "failed to register the subdevice\n"); + goto csi2dc_probe_cleanup_notifier; + } + + dev_info(dev, "Microchip CSI2DC version %x\n", ver); + + return 0; + +csi2dc_probe_cleanup_notifier: + v4l2_async_nf_cleanup(&csi2dc->notifier); +csi2dc_probe_cleanup_entity: + media_entity_cleanup(&csi2dc->csi2dc_sd.entity); + + return ret; +} + +static int csi2dc_remove(struct platform_device *pdev) +{ + struct csi2dc_device *csi2dc = platform_get_drvdata(pdev); + + pm_runtime_disable(&pdev->dev); + + v4l2_async_unregister_subdev(&csi2dc->csi2dc_sd); + v4l2_async_nf_unregister(&csi2dc->notifier); + v4l2_async_nf_cleanup(&csi2dc->notifier); + media_entity_cleanup(&csi2dc->csi2dc_sd.entity); + + return 0; +} + +static int __maybe_unused csi2dc_runtime_suspend(struct device *dev) +{ + struct csi2dc_device *csi2dc = dev_get_drvdata(dev); + + return csi2dc_power(csi2dc, false); +} + +static int __maybe_unused csi2dc_runtime_resume(struct device *dev) +{ + struct csi2dc_device *csi2dc = dev_get_drvdata(dev); + + return csi2dc_power(csi2dc, true); +} + +static const struct dev_pm_ops csi2dc_dev_pm_ops = { + SET_RUNTIME_PM_OPS(csi2dc_runtime_suspend, csi2dc_runtime_resume, NULL) +}; + +static const struct of_device_id csi2dc_of_match[] = { + { .compatible = "microchip,sama7g5-csi2dc" }, + { } +}; + +MODULE_DEVICE_TABLE(of, csi2dc_of_match); + +static struct platform_driver csi2dc_driver = { + .probe = csi2dc_probe, + .remove = csi2dc_remove, + .driver = { + .name = "microchip-csi2dc", + .pm = &csi2dc_dev_pm_ops, + .of_match_table = of_match_ptr(csi2dc_of_match), + }, +}; + +module_platform_driver(csi2dc_driver); + +MODULE_AUTHOR("Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx>"); +MODULE_DESCRIPTION("Microchip CSI2 Demux Controller driver"); +MODULE_LICENSE("GPL v2"); -- 2.25.1
