1 files changed, 593 insertions, 0 deletions

diff --git a/drivers/media/platform/renesas/rcar-isp/csisp.c b/drivers/media/platform/renesas/rcar-isp/csisp.c
new file mode 100644
index 000000000000..1eb29a0b774a
--- /dev/null
+++ b/drivers/media/platform/renesas/rcar-isp/csisp.c
@@ -0,0 +1,593 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2021 Renesas Electronics Corp.
+ *
+ * Driver for Renesas R-Car ISP Channel Selector
+ *
+ * The ISP hardware is capable of more than just channel selection, features
+ * such as demosaicing, white balance control and color space conversion are
+ * also possible. These more advanced features are not supported by the driver
+ * due to lack of documentation.
+ */
+
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/reset.h>
+
+#include <media/mipi-csi2.h>
+#include <media/v4l2-subdev.h>
+
+#define ISPINPUTSEL0_REG				0x0008
+#define ISPINPUTSEL0_SEL_CSI0				BIT(31)
+
+#define ISPSTART_REG					0x0014
+#define ISPSTART_START					0xffff
+#define ISPSTART_STOP					0x0000
+
+#define ISPPROCMODE_DT_REG(n)				(0x1100 + (0x4 * (n)))
+#define ISPPROCMODE_DT_PROC_MODE_VC3(pm)		(((pm) & 0x3f) << 24)
+#define ISPPROCMODE_DT_PROC_MODE_VC2(pm)		(((pm) & 0x3f) << 16)
+#define ISPPROCMODE_DT_PROC_MODE_VC1(pm)		(((pm) & 0x3f) << 8)
+#define ISPPROCMODE_DT_PROC_MODE_VC0(pm)		((pm) & 0x3f)
+
+#define ISPCS_FILTER_ID_CH_REG(n)			(0x3000 + (0x0100 * (n)))
+
+#define ISPCS_DT_CODE03_CH_REG(n)			(0x3008 + (0x100 * (n)))
+#define ISPCS_DT_CODE03_EN3				BIT(31)
+#define ISPCS_DT_CODE03_DT3(dt)				(((dt) & 0x3f) << 24)
+#define ISPCS_DT_CODE03_EN2				BIT(23)
+#define ISPCS_DT_CODE03_DT2(dt)				(((dt) & 0x3f) << 16)
+#define ISPCS_DT_CODE03_EN1				BIT(15)
+#define ISPCS_DT_CODE03_DT1(dt)				(((dt) & 0x3f) << 8)
+#define ISPCS_DT_CODE03_EN0				BIT(7)
+#define ISPCS_DT_CODE03_DT0(dt)				((dt) & 0x3f)
+
+struct rcar_isp_format {
+	u32 code;
+	unsigned int datatype;
+	unsigned int procmode;
+};
+
+static const struct rcar_isp_format rcar_isp_formats[] = {
+	{
+		.code = MEDIA_BUS_FMT_RGB888_1X24,
+		.datatype = MIPI_CSI2_DT_RGB888,
+		.procmode = 0x15
+	}, {
+		.code = MEDIA_BUS_FMT_Y10_1X10,
+		.datatype = MIPI_CSI2_DT_RAW10,
+		.procmode = 0x10,
+	}, {
+		.code = MEDIA_BUS_FMT_UYVY8_1X16,
+		.datatype = MIPI_CSI2_DT_YUV422_8B,
+		.procmode = 0x0c,
+	}, {
+		.code = MEDIA_BUS_FMT_YUYV8_1X16,
+		.datatype = MIPI_CSI2_DT_YUV422_8B,
+		.procmode = 0x0c,
+	}, {
+		.code = MEDIA_BUS_FMT_UYVY8_2X8,
+		.datatype = MIPI_CSI2_DT_YUV422_8B,
+		.procmode = 0x0c,
+	}, {
+		.code = MEDIA_BUS_FMT_YUYV10_2X10,
+		.datatype = MIPI_CSI2_DT_YUV422_8B,
+		.procmode = 0x0c,
+	}, {
+		.code = MEDIA_BUS_FMT_SBGGR8_1X8,
+		.datatype = MIPI_CSI2_DT_RAW8,
+		.procmode = 0x00,
+	}, {
+		.code = MEDIA_BUS_FMT_SGBRG8_1X8,
+		.datatype = MIPI_CSI2_DT_RAW8,
+		.procmode = 0x00,
+	}, {
+		.code = MEDIA_BUS_FMT_SGRBG8_1X8,
+		.datatype = MIPI_CSI2_DT_RAW8,
+		.procmode = 0x00,
+	}, {
+		.code = MEDIA_BUS_FMT_SRGGB8_1X8,
+		.datatype = MIPI_CSI2_DT_RAW8,
+		.procmode = 0x00,
+	}, {
+		.code = MEDIA_BUS_FMT_SBGGR10_1X10,
+		.datatype = MIPI_CSI2_DT_RAW10,
+		.procmode = 0x01,
+	}, {
+		.code = MEDIA_BUS_FMT_SGBRG10_1X10,
+		.datatype = MIPI_CSI2_DT_RAW10,
+		.procmode = 0x01,
+	}, {
+		.code = MEDIA_BUS_FMT_SGRBG10_1X10,
+		.datatype = MIPI_CSI2_DT_RAW10,
+		.procmode = 0x01,
+	}, {
+		.code = MEDIA_BUS_FMT_SRGGB10_1X10,
+		.datatype = MIPI_CSI2_DT_RAW10,
+		.procmode = 0x01,
+	}, {
+		.code = MEDIA_BUS_FMT_SBGGR12_1X12,
+		.datatype = MIPI_CSI2_DT_RAW12,
+		.procmode = 0x02,
+	}, {
+		.code = MEDIA_BUS_FMT_SGBRG12_1X12,
+		.datatype = MIPI_CSI2_DT_RAW12,
+		.procmode = 0x02,
+	}, {
+		.code = MEDIA_BUS_FMT_SGRBG12_1X12,
+		.datatype = MIPI_CSI2_DT_RAW12,
+		.procmode = 0x02,
+	}, {
+		.code = MEDIA_BUS_FMT_SRGGB12_1X12,
+		.datatype = MIPI_CSI2_DT_RAW12,
+		.procmode = 0x02,
+	},
+};
+
+static const struct rcar_isp_format *risp_code_to_fmt(unsigned int code)
+{
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(rcar_isp_formats); i++) {
+		if (rcar_isp_formats[i].code == code)
+			return &rcar_isp_formats[i];
+	}
+
+	return NULL;
+}
+
+enum rcar_isp_input {
+	RISP_CSI_INPUT0,
+	RISP_CSI_INPUT1,
+};
+
+enum rcar_isp_pads {
+	RCAR_ISP_SINK,
+	RCAR_ISP_PORT0,
+	RCAR_ISP_PORT1,
+	RCAR_ISP_PORT2,
+	RCAR_ISP_PORT3,
+	RCAR_ISP_PORT4,
+	RCAR_ISP_PORT5,
+	RCAR_ISP_PORT6,
+	RCAR_ISP_PORT7,
+	RCAR_ISP_NUM_PADS,
+};
+
+struct rcar_isp {
+	struct device *dev;
+	void __iomem *csbase;
+	struct reset_control *rstc;
+
+	enum rcar_isp_input csi_input;
+
+	struct v4l2_subdev subdev;
+	struct media_pad pads[RCAR_ISP_NUM_PADS];
+
+	struct v4l2_async_notifier notifier;
+	struct v4l2_subdev *remote;
+	unsigned int remote_pad;
+
+	int stream_count;
+};
+
+static inline struct rcar_isp *sd_to_isp(struct v4l2_subdev *sd)
+{
+	return container_of(sd, struct rcar_isp, subdev);
+}
+
+static inline struct rcar_isp *notifier_to_isp(struct v4l2_async_notifier *n)
+{
+	return container_of(n, struct rcar_isp, notifier);
+}
+
+static void risp_write_cs(struct rcar_isp *isp, u32 offset, u32 value)
+{
+	iowrite32(value, isp->csbase + offset);
+}
+
+static u32 risp_read_cs(struct rcar_isp *isp, u32 offset)
+{
+	return ioread32(isp->csbase + offset);
+}
+
+static int risp_power_on(struct rcar_isp *isp)
+{
+	int ret;
+
+	ret = pm_runtime_resume_and_get(isp->dev);
+	if (ret < 0)
+		return ret;
+
+	ret = reset_control_deassert(isp->rstc);
+	if (ret < 0) {
+		pm_runtime_put(isp->dev);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void risp_power_off(struct rcar_isp *isp)
+{
+	reset_control_assert(isp->rstc);
+	pm_runtime_put(isp->dev);
+}
+
+static int risp_start(struct rcar_isp *isp, struct v4l2_subdev_state *state)
+{
+	const struct v4l2_mbus_framefmt *fmt;
+	const struct rcar_isp_format *format;
+	unsigned int vc;
+	u32 sel_csi = 0;
+	int ret;
+
+	fmt = v4l2_subdev_state_get_format(state, RCAR_ISP_SINK);
+	if (!fmt)
+		return -EINVAL;
+
+	format = risp_code_to_fmt(fmt->code);
+	if (!format) {
+		dev_err(isp->dev, "Unsupported bus format\n");
+		return -EINVAL;
+	}
+
+	ret = risp_power_on(isp);
+	if (ret) {
+		dev_err(isp->dev, "Failed to power on ISP\n");
+		return ret;
+	}
+
+	/* Select CSI-2 input source. */
+	if (isp->csi_input == RISP_CSI_INPUT1)
+		sel_csi = ISPINPUTSEL0_SEL_CSI0;
+
+	risp_write_cs(isp, ISPINPUTSEL0_REG,
+		      risp_read_cs(isp, ISPINPUTSEL0_REG) | sel_csi);
+
+	/* Configure Channel Selector. */
+	for (vc = 0; vc < 4; vc++) {
+		u8 ch = vc + 4;
+		u8 dt = format->datatype;
+
+		risp_write_cs(isp, ISPCS_FILTER_ID_CH_REG(ch), BIT(vc));
+		risp_write_cs(isp, ISPCS_DT_CODE03_CH_REG(ch),
+			      ISPCS_DT_CODE03_EN3 | ISPCS_DT_CODE03_DT3(dt) |
+			      ISPCS_DT_CODE03_EN2 | ISPCS_DT_CODE03_DT2(dt) |
+			      ISPCS_DT_CODE03_EN1 | ISPCS_DT_CODE03_DT1(dt) |
+			      ISPCS_DT_CODE03_EN0 | ISPCS_DT_CODE03_DT0(dt));
+	}
+
+	/* Setup processing method. */
+	risp_write_cs(isp, ISPPROCMODE_DT_REG(format->datatype),
+		      ISPPROCMODE_DT_PROC_MODE_VC3(format->procmode) |
+		      ISPPROCMODE_DT_PROC_MODE_VC2(format->procmode) |
+		      ISPPROCMODE_DT_PROC_MODE_VC1(format->procmode) |
+		      ISPPROCMODE_DT_PROC_MODE_VC0(format->procmode));
+
+	/* Start ISP. */
+	risp_write_cs(isp, ISPSTART_REG, ISPSTART_START);
+
+	ret = v4l2_subdev_enable_streams(isp->remote, isp->remote_pad,
+					 BIT_ULL(0));
+	if (ret)
+		risp_power_off(isp);
+
+	return ret;
+}
+
+static void risp_stop(struct rcar_isp *isp)
+{
+	v4l2_subdev_disable_streams(isp->remote, isp->remote_pad, BIT_ULL(0));
+
+	/* Stop ISP. */
+	risp_write_cs(isp, ISPSTART_REG, ISPSTART_STOP);
+
+	risp_power_off(isp);
+}
+
+static int risp_enable_streams(struct v4l2_subdev *sd,
+			       struct v4l2_subdev_state *state, u32 source_pad,
+			       u64 source_streams_mask)
+{
+	struct rcar_isp *isp = sd_to_isp(sd);
+	int ret = 0;
+
+	if (source_streams_mask != 1)
+		return -EINVAL;
+
+	if (!isp->remote)
+		return -ENODEV;
+
+	if (isp->stream_count == 0) {
+		ret = risp_start(isp, state);
+		if (ret)
+			return ret;
+	}
+
+	isp->stream_count += 1;
+
+	return ret;
+}
+
+static int risp_disable_streams(struct v4l2_subdev *sd,
+				struct v4l2_subdev_state *state, u32 source_pad,
+				u64 source_streams_mask)
+{
+	struct rcar_isp *isp = sd_to_isp(sd);
+
+	if (source_streams_mask != 1)
+		return -EINVAL;
+
+	if (!isp->remote)
+		return -ENODEV;
+
+	if (isp->stream_count == 1)
+		risp_stop(isp);
+
+	isp->stream_count -= 1;
+
+	return 0;
+}
+
+static int risp_set_pad_format(struct v4l2_subdev *sd,
+			       struct v4l2_subdev_state *state,
+			       struct v4l2_subdev_format *format)
+{
+	struct v4l2_mbus_framefmt *framefmt;
+
+	if (format->pad > RCAR_ISP_SINK)
+		return v4l2_subdev_get_fmt(sd, state, format);
+
+	if (!risp_code_to_fmt(format->format.code))
+		format->format.code = rcar_isp_formats[0].code;
+
+	for (unsigned int i = 0; i < RCAR_ISP_NUM_PADS; i++) {
+		framefmt = v4l2_subdev_state_get_format(state, i);
+		*framefmt = format->format;
+	}
+
+	return 0;
+}
+
+static const struct v4l2_subdev_pad_ops risp_pad_ops = {
+	.enable_streams = risp_enable_streams,
+	.disable_streams = risp_disable_streams,
+	.set_fmt = risp_set_pad_format,
+	.get_fmt = v4l2_subdev_get_fmt,
+	.link_validate = v4l2_subdev_link_validate_default,
+};
+
+static const struct v4l2_subdev_ops rcar_isp_subdev_ops = {
+	.pad	= &risp_pad_ops,
+};
+
+/* -----------------------------------------------------------------------------
+ * Async handling and registration of subdevices and links
+ */
+
+static int risp_notify_bound(struct v4l2_async_notifier *notifier,
+			     struct v4l2_subdev *subdev,
+			     struct v4l2_async_connection *asd)
+{
+	struct rcar_isp *isp = notifier_to_isp(notifier);
+	int pad;
+
+	pad = media_entity_get_fwnode_pad(&subdev->entity, asd->match.fwnode,
+					  MEDIA_PAD_FL_SOURCE);
+	if (pad < 0) {
+		dev_err(isp->dev, "Failed to find pad for %s\n", subdev->name);
+		return pad;
+	}
+
+	isp->remote = subdev;
+	isp->remote_pad = pad;
+
+	dev_dbg(isp->dev, "Bound %s pad: %d\n", subdev->name, pad);
+
+	return media_create_pad_link(&subdev->entity, pad,
+				     &isp->subdev.entity, 0,
+				     MEDIA_LNK_FL_ENABLED |
+				     MEDIA_LNK_FL_IMMUTABLE);
+}
+
+static void risp_notify_unbind(struct v4l2_async_notifier *notifier,
+			       struct v4l2_subdev *subdev,
+			       struct v4l2_async_connection *asd)
+{
+	struct rcar_isp *isp = notifier_to_isp(notifier);
+
+	isp->remote = NULL;
+
+	dev_dbg(isp->dev, "Unbind %s\n", subdev->name);
+}
+
+static const struct v4l2_async_notifier_operations risp_notify_ops = {
+	.bound = risp_notify_bound,
+	.unbind = risp_notify_unbind,
+};
+
+static int risp_parse_dt(struct rcar_isp *isp)
+{
+	struct v4l2_async_connection *asd;
+	struct fwnode_handle *fwnode;
+	struct fwnode_handle *ep;
+	unsigned int id;
+	int ret;
+
+	for (id = 0; id < 2; id++) {
+		ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(isp->dev),
+						     0, id, 0);
+		if (ep)
+			break;
+	}
+
+	if (!ep) {
+		dev_err(isp->dev, "Not connected to subdevice\n");
+		return -EINVAL;
+	}
+
+	if (id == 1)
+		isp->csi_input = RISP_CSI_INPUT1;
+
+	fwnode = fwnode_graph_get_remote_endpoint(ep);
+	fwnode_handle_put(ep);
+
+	dev_dbg(isp->dev, "Found '%pOF'\n", to_of_node(fwnode));
+
+	v4l2_async_subdev_nf_init(&isp->notifier, &isp->subdev);
+	isp->notifier.ops = &risp_notify_ops;
+
+	asd = v4l2_async_nf_add_fwnode(&isp->notifier, fwnode,
+				       struct v4l2_async_connection);
+	fwnode_handle_put(fwnode);
+	if (IS_ERR(asd))
+		return PTR_ERR(asd);
+
+	ret = v4l2_async_nf_register(&isp->notifier);
+	if (ret)
+		v4l2_async_nf_cleanup(&isp->notifier);
+
+	return ret;
+}
+
+/* -----------------------------------------------------------------------------
+ * Platform Device Driver
+ */
+
+static const struct media_entity_operations risp_entity_ops = {
+	.link_validate = v4l2_subdev_link_validate,
+};
+
+static int risp_probe_resources(struct rcar_isp *isp,
+				struct platform_device *pdev)
+{
+	struct resource *res;
+
+	/*
+	 * For backward compatibility allow cs base to be the only reg if no
+	 * reg-names are set in DT.
+	 */
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cs");
+	if (!res)
+		isp->csbase = devm_platform_ioremap_resource(pdev, 0);
+	else
+		isp->csbase = devm_ioremap_resource(&pdev->dev, res);
+
+	if (IS_ERR(isp->csbase))
+		return PTR_ERR(isp->csbase);
+
+	isp->rstc = devm_reset_control_get(&pdev->dev, NULL);
+
+	return PTR_ERR_OR_ZERO(isp->rstc);
+}
+
+static const struct of_device_id risp_of_id_table[] = {
+	{ .compatible = "renesas,r8a779a0-isp" },
+	{ .compatible = "renesas,r8a779g0-isp" },
+	/* Keep above for compatibility with old DTB files. */
+	{ .compatible = "renesas,rcar-gen4-isp" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, risp_of_id_table);
+
+static int risp_probe(struct platform_device *pdev)
+{
+	struct rcar_isp *isp;
+	unsigned int i;
+	int ret;
+
+	isp = devm_kzalloc(&pdev->dev, sizeof(*isp), GFP_KERNEL);
+	if (!isp)
+		return -ENOMEM;
+
+	isp->dev = &pdev->dev;
+
+	ret = risp_probe_resources(isp, pdev);
+	if (ret) {
+		dev_err(isp->dev, "Failed to get resources\n");
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, isp);
+
+	pm_runtime_enable(&pdev->dev);
+
+	ret = risp_parse_dt(isp);
+	if (ret)
+		goto error_pm;
+
+	isp->subdev.owner = THIS_MODULE;
+	isp->subdev.dev = &pdev->dev;
+	v4l2_subdev_init(&isp->subdev, &rcar_isp_subdev_ops);
+	v4l2_set_subdevdata(&isp->subdev, &pdev->dev);
+	snprintf(isp->subdev.name, sizeof(isp->subdev.name), "%s %s",
+		 KBUILD_MODNAME, dev_name(&pdev->dev));
+	isp->subdev.flags = V4L2_SUBDEV_FL_HAS_DEVNODE;
+
+	isp->subdev.entity.function = MEDIA_ENT_F_VID_MUX;
+	isp->subdev.entity.ops = &risp_entity_ops;
+
+	isp->pads[RCAR_ISP_SINK].flags = MEDIA_PAD_FL_SINK;
+	for (i = RCAR_ISP_PORT0; i < RCAR_ISP_NUM_PADS; i++)
+		isp->pads[i].flags = MEDIA_PAD_FL_SOURCE;
+
+	ret = media_entity_pads_init(&isp->subdev.entity, RCAR_ISP_NUM_PADS,
+				     isp->pads);
+	if (ret)
+		goto error_notifier;
+
+	ret = v4l2_subdev_init_finalize(&isp->subdev);
+	if (ret)
+		goto error_notifier;
+
+	ret = v4l2_async_register_subdev(&isp->subdev);
+	if (ret < 0)
+		goto error_subdev;
+
+	dev_info(isp->dev, "Using CSI-2 input: %u\n", isp->csi_input);
+
+	return 0;
+
+error_subdev:
+	v4l2_subdev_cleanup(&isp->subdev);
+error_notifier:
+	v4l2_async_nf_unregister(&isp->notifier);
+	v4l2_async_nf_cleanup(&isp->notifier);
+error_pm:
+	pm_runtime_disable(&pdev->dev);
+
+	return ret;
+}
+
+static void risp_remove(struct platform_device *pdev)
+{
+	struct rcar_isp *isp = platform_get_drvdata(pdev);
+
+	v4l2_async_nf_unregister(&isp->notifier);
+	v4l2_async_nf_cleanup(&isp->notifier);
+
+	v4l2_async_unregister_subdev(&isp->subdev);
+	v4l2_subdev_cleanup(&isp->subdev);
+
+	pm_runtime_disable(&pdev->dev);
+}
+
+static struct platform_driver rcar_isp_driver = {
+	.driver = {
+		.name = "rcar-isp",
+		.suppress_bind_attrs = true,
+		.of_match_table = risp_of_id_table,
+	},
+	.probe = risp_probe,
+	.remove = risp_remove,
+};
+
+module_platform_driver(rcar_isp_driver);
+
+MODULE_AUTHOR("Niklas Söderlund <niklas.soderlund@ragnatech.se>");
+MODULE_DESCRIPTION("Renesas R-Car ISP Channel Selector driver");
+MODULE_LICENSE("GPL");