// 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 #include #include #include #include #include #include #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 "); MODULE_DESCRIPTION("Renesas R-Car ISP Channel Selector driver"); MODULE_LICENSE("GPL");