--- /dev/null
+// 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_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/reset.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 = 0x24, .procmode = 0x15 },
+ { .code = MEDIA_BUS_FMT_Y10_1X10, .datatype = 0x2b, .procmode = 0x10 },
+ { .code = MEDIA_BUS_FMT_UYVY8_1X16, .datatype = 0x1e, .procmode = 0x0c },
+ { .code = MEDIA_BUS_FMT_YUYV8_1X16, .datatype = 0x1e, .procmode = 0x0c },
+ { .code = MEDIA_BUS_FMT_UYVY8_2X8, .datatype = 0x1e, .procmode = 0x0c },
+ { .code = MEDIA_BUS_FMT_YUYV10_2X10, .datatype = 0x1e, .procmode = 0x0c },
+};
+
+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 *base;
+ 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;
+
+ struct mutex lock; /* Protects mf and stream_count. */
+ struct v4l2_mbus_framefmt mf;
+ 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(struct rcar_isp *isp, u32 offset, u32 value)
+{
+ iowrite32(value, isp->base + offset);
+}
+
+static u32 risp_read(struct rcar_isp *isp, u32 offset)
+{
+ return ioread32(isp->base + 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)
+{
+ const struct rcar_isp_format *format;
+ unsigned int vc;
+ u32 sel_csi = 0;
+ int ret;
+
+ format = risp_code_to_fmt(isp->mf.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(isp, ISPINPUTSEL0_REG,
+ risp_read(isp, ISPINPUTSEL0_REG) | sel_csi);
+
+ /* Configure Channel Selector. */
+ for (vc = 0; vc < 4; vc++) {
+ u8 ch = vc + 4;
+ u8 dt = format->datatype;
+
+ risp_write(isp, ISPCS_FILTER_ID_CH_REG(ch), BIT(vc));
+ risp_write(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(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(isp, ISPSTART_REG, ISPSTART_START);
+
+ ret = v4l2_subdev_call(isp->remote, video, s_stream, 1);
+ if (ret)
+ risp_power_off(isp);
+
+ return ret;
+}
+
+static void risp_stop(struct rcar_isp *isp)
+{
+ v4l2_subdev_call(isp->remote, video, s_stream, 0);
+
+ /* Stop ISP. */
+ risp_write(isp, ISPSTART_REG, ISPSTART_STOP);
+
+ risp_power_off(isp);
+}
+
+static int risp_s_stream(struct v4l2_subdev *sd, int enable)
+{
+ struct rcar_isp *isp = sd_to_isp(sd);
+ int ret = 0;
+
+ mutex_lock(&isp->lock);
+
+ if (!isp->remote) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ if (enable && isp->stream_count == 0) {
+ ret = risp_start(isp);
+ if (ret)
+ goto out;
+ } else if (!enable && isp->stream_count == 1) {
+ risp_stop(isp);
+ }
+
+ isp->stream_count += enable ? 1 : -1;
+out:
+ mutex_unlock(&isp->lock);
+
+ return ret;
+}
+
+static const struct v4l2_subdev_video_ops risp_video_ops = {
+ .s_stream = risp_s_stream,
+};
+
+static int risp_set_pad_format(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *sd_state,
+ struct v4l2_subdev_format *format)
+{
+ struct rcar_isp *isp = sd_to_isp(sd);
+ struct v4l2_mbus_framefmt *framefmt;
+
+ mutex_lock(&isp->lock);
+
+ if (!risp_code_to_fmt(format->format.code))
+ format->format.code = rcar_isp_formats[0].code;
+
+ if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
+ isp->mf = format->format;
+ } else {
+ framefmt = v4l2_subdev_get_try_format(sd, sd_state, 0);
+ *framefmt = format->format;
+ }
+
+ mutex_unlock(&isp->lock);
+
+ return 0;
+}
+
+static int risp_get_pad_format(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *sd_state,
+ struct v4l2_subdev_format *format)
+{
+ struct rcar_isp *isp = sd_to_isp(sd);
+
+ mutex_lock(&isp->lock);
+
+ if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE)
+ format->format = isp->mf;
+ else
+ format->format = *v4l2_subdev_get_try_format(sd, sd_state, 0);
+
+ mutex_unlock(&isp->lock);
+
+ return 0;
+}
+
+static const struct v4l2_subdev_pad_ops risp_pad_ops = {
+ .set_fmt = risp_set_pad_format,
+ .get_fmt = risp_get_pad_format,
+ .link_validate = v4l2_subdev_link_validate_default,
+};
+
+static const struct v4l2_subdev_ops rcar_isp_subdev_ops = {
+ .video = &risp_video_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_subdev *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;
+
+ 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_subdev *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_subdev *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_nf_init(&isp->notifier);
+ isp->notifier.ops = &risp_notify_ops;
+
+ asd = v4l2_async_nf_add_fwnode(&isp->notifier, fwnode,
+ struct v4l2_async_subdev);
+ fwnode_handle_put(fwnode);
+ if (IS_ERR(asd))
+ return PTR_ERR(asd);
+
+ ret = v4l2_async_subdev_nf_register(&isp->subdev, &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;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ isp->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(isp->base))
+ return PTR_ERR(isp->base);
+
+ 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" },
+ { /* 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;
+
+ mutex_init(&isp->lock);
+
+ ret = risp_probe_resources(isp, pdev);
+ if (ret) {
+ dev_err(isp->dev, "Failed to get resources\n");
+ goto error_mutex;
+ }
+
+ 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, V4L2_SUBDEV_NAME_SIZE, "%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_async_register_subdev(&isp->subdev);
+ if (ret < 0)
+ goto error_notifier;
+
+ dev_info(isp->dev, "Using CSI-2 input: %u\n", isp->csi_input);
+
+ return 0;
+error_notifier:
+ v4l2_async_nf_unregister(&isp->notifier);
+ v4l2_async_nf_cleanup(&isp->notifier);
+error_pm:
+ pm_runtime_disable(&pdev->dev);
+error_mutex:
+ mutex_destroy(&isp->lock);
+
+ return ret;
+}
+
+static int 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);
+
+ pm_runtime_disable(&pdev->dev);
+
+ mutex_destroy(&isp->lock);
+
+ return 0;
+}
+
+static struct platform_driver rcar_isp_driver = {
+ .driver = {
+ .name = "rcar-isp",
+ .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");
projects / platform / kernel / linux-rpi.git / commitdiff