| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * Copyright (C) 2016 NextThing Co |
| * Copyright (C) 2016-2019 Bootlin |
| * |
| * Author: Maxime Ripard <maxime.ripard@bootlin.com> |
| */ |
| |
| #include <linux/clk.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/interrupt.h> |
| #include <linux/module.h> |
| #include <linux/mutex.h> |
| #include <linux/of.h> |
| #include <linux/of_device.h> |
| #include <linux/of_graph.h> |
| #include <linux/platform_device.h> |
| #include <linux/pm_runtime.h> |
| #include <linux/reset.h> |
| #include <linux/videodev2.h> |
| |
| #include <media/v4l2-dev.h> |
| #include <media/v4l2-device.h> |
| #include <media/v4l2-fwnode.h> |
| #include <media/v4l2-ioctl.h> |
| #include <media/v4l2-mediabus.h> |
| |
| #include <media/videobuf2-core.h> |
| #include <media/videobuf2-dma-contig.h> |
| |
| #include "sun4i_csi.h" |
| |
| struct sun4i_csi_traits { |
| unsigned int channels; |
| unsigned int max_width; |
| bool has_isp; |
| }; |
| |
| static const struct media_entity_operations sun4i_csi_video_entity_ops = { |
| .link_validate = v4l2_subdev_link_validate, |
| }; |
| |
| static int sun4i_csi_notify_bound(struct v4l2_async_notifier *notifier, |
| struct v4l2_subdev *subdev, |
| struct v4l2_async_subdev *asd) |
| { |
| struct sun4i_csi *csi = container_of(notifier, struct sun4i_csi, |
| notifier); |
| |
| csi->src_subdev = subdev; |
| csi->src_pad = media_entity_get_fwnode_pad(&subdev->entity, |
| subdev->fwnode, |
| MEDIA_PAD_FL_SOURCE); |
| if (csi->src_pad < 0) { |
| dev_err(csi->dev, "Couldn't find output pad for subdev %s\n", |
| subdev->name); |
| return csi->src_pad; |
| } |
| |
| dev_dbg(csi->dev, "Bound %s pad: %d\n", subdev->name, csi->src_pad); |
| return 0; |
| } |
| |
| static int sun4i_csi_notify_complete(struct v4l2_async_notifier *notifier) |
| { |
| struct sun4i_csi *csi = container_of(notifier, struct sun4i_csi, |
| notifier); |
| struct v4l2_subdev *subdev = &csi->subdev; |
| struct video_device *vdev = &csi->vdev; |
| int ret; |
| |
| ret = v4l2_device_register_subdev(&csi->v4l, subdev); |
| if (ret < 0) |
| return ret; |
| |
| ret = sun4i_csi_v4l2_register(csi); |
| if (ret < 0) |
| return ret; |
| |
| ret = media_device_register(&csi->mdev); |
| if (ret) |
| return ret; |
| |
| /* Create link from subdev to main device */ |
| ret = media_create_pad_link(&subdev->entity, CSI_SUBDEV_SOURCE, |
| &vdev->entity, 0, |
| MEDIA_LNK_FL_ENABLED | |
| MEDIA_LNK_FL_IMMUTABLE); |
| if (ret) |
| goto err_clean_media; |
| |
| ret = media_create_pad_link(&csi->src_subdev->entity, csi->src_pad, |
| &subdev->entity, CSI_SUBDEV_SINK, |
| MEDIA_LNK_FL_ENABLED | |
| MEDIA_LNK_FL_IMMUTABLE); |
| if (ret) |
| goto err_clean_media; |
| |
| ret = v4l2_device_register_subdev_nodes(&csi->v4l); |
| if (ret < 0) |
| goto err_clean_media; |
| |
| return 0; |
| |
| err_clean_media: |
| media_device_unregister(&csi->mdev); |
| |
| return ret; |
| } |
| |
| static const struct v4l2_async_notifier_operations sun4i_csi_notify_ops = { |
| .bound = sun4i_csi_notify_bound, |
| .complete = sun4i_csi_notify_complete, |
| }; |
| |
| static int sun4i_csi_notifier_init(struct sun4i_csi *csi) |
| { |
| struct v4l2_fwnode_endpoint vep = { |
| .bus_type = V4L2_MBUS_PARALLEL, |
| }; |
| struct fwnode_handle *ep; |
| int ret; |
| |
| v4l2_async_notifier_init(&csi->notifier); |
| |
| ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(csi->dev), 0, 0, |
| FWNODE_GRAPH_ENDPOINT_NEXT); |
| if (!ep) |
| return -EINVAL; |
| |
| ret = v4l2_fwnode_endpoint_parse(ep, &vep); |
| if (ret) |
| goto out; |
| |
| csi->bus = vep.bus.parallel; |
| |
| ret = v4l2_async_notifier_add_fwnode_remote_subdev(&csi->notifier, |
| ep, &csi->asd); |
| if (ret) |
| goto out; |
| |
| csi->notifier.ops = &sun4i_csi_notify_ops; |
| |
| out: |
| fwnode_handle_put(ep); |
| return ret; |
| } |
| |
| static int sun4i_csi_probe(struct platform_device *pdev) |
| { |
| struct v4l2_subdev *subdev; |
| struct video_device *vdev; |
| struct sun4i_csi *csi; |
| struct resource *res; |
| int ret; |
| int irq; |
| |
| csi = devm_kzalloc(&pdev->dev, sizeof(*csi), GFP_KERNEL); |
| if (!csi) |
| return -ENOMEM; |
| platform_set_drvdata(pdev, csi); |
| csi->dev = &pdev->dev; |
| subdev = &csi->subdev; |
| vdev = &csi->vdev; |
| |
| csi->traits = of_device_get_match_data(&pdev->dev); |
| if (!csi->traits) |
| return -EINVAL; |
| |
| csi->mdev.dev = csi->dev; |
| strscpy(csi->mdev.model, "Allwinner Video Capture Device", |
| sizeof(csi->mdev.model)); |
| csi->mdev.hw_revision = 0; |
| snprintf(csi->mdev.bus_info, sizeof(csi->mdev.bus_info), "platform:%s", |
| dev_name(csi->dev)); |
| media_device_init(&csi->mdev); |
| csi->v4l.mdev = &csi->mdev; |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| csi->regs = devm_ioremap_resource(&pdev->dev, res); |
| if (IS_ERR(csi->regs)) |
| return PTR_ERR(csi->regs); |
| |
| irq = platform_get_irq(pdev, 0); |
| if (irq < 0) |
| return irq; |
| |
| csi->bus_clk = devm_clk_get(&pdev->dev, "bus"); |
| if (IS_ERR(csi->bus_clk)) { |
| dev_err(&pdev->dev, "Couldn't get our bus clock\n"); |
| return PTR_ERR(csi->bus_clk); |
| } |
| |
| if (csi->traits->has_isp) { |
| csi->isp_clk = devm_clk_get(&pdev->dev, "isp"); |
| if (IS_ERR(csi->isp_clk)) { |
| dev_err(&pdev->dev, "Couldn't get our ISP clock\n"); |
| return PTR_ERR(csi->isp_clk); |
| } |
| } |
| |
| csi->ram_clk = devm_clk_get(&pdev->dev, "ram"); |
| if (IS_ERR(csi->ram_clk)) { |
| dev_err(&pdev->dev, "Couldn't get our ram clock\n"); |
| return PTR_ERR(csi->ram_clk); |
| } |
| |
| csi->rst = devm_reset_control_get(&pdev->dev, NULL); |
| if (IS_ERR(csi->rst)) { |
| dev_err(&pdev->dev, "Couldn't get our reset line\n"); |
| return PTR_ERR(csi->rst); |
| } |
| |
| /* Initialize subdev */ |
| v4l2_subdev_init(subdev, &sun4i_csi_subdev_ops); |
| subdev->flags = V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS; |
| subdev->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE; |
| subdev->owner = THIS_MODULE; |
| snprintf(subdev->name, sizeof(subdev->name), "sun4i-csi-0"); |
| v4l2_set_subdevdata(subdev, csi); |
| |
| csi->subdev_pads[CSI_SUBDEV_SINK].flags = |
| MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT; |
| csi->subdev_pads[CSI_SUBDEV_SOURCE].flags = MEDIA_PAD_FL_SOURCE; |
| ret = media_entity_pads_init(&subdev->entity, CSI_SUBDEV_PADS, |
| csi->subdev_pads); |
| if (ret < 0) |
| return ret; |
| |
| csi->vdev_pad.flags = MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT; |
| vdev->entity.ops = &sun4i_csi_video_entity_ops; |
| ret = media_entity_pads_init(&vdev->entity, 1, &csi->vdev_pad); |
| if (ret < 0) |
| return ret; |
| |
| ret = sun4i_csi_dma_register(csi, irq); |
| if (ret) |
| goto err_clean_pad; |
| |
| ret = sun4i_csi_notifier_init(csi); |
| if (ret) |
| goto err_unregister_media; |
| |
| ret = v4l2_async_notifier_register(&csi->v4l, &csi->notifier); |
| if (ret) { |
| dev_err(csi->dev, "Couldn't register our notifier.\n"); |
| goto err_unregister_media; |
| } |
| |
| pm_runtime_enable(&pdev->dev); |
| |
| return 0; |
| |
| err_unregister_media: |
| media_device_unregister(&csi->mdev); |
| sun4i_csi_dma_unregister(csi); |
| |
| err_clean_pad: |
| media_device_cleanup(&csi->mdev); |
| |
| return ret; |
| } |
| |
| static int sun4i_csi_remove(struct platform_device *pdev) |
| { |
| struct sun4i_csi *csi = platform_get_drvdata(pdev); |
| |
| v4l2_async_notifier_unregister(&csi->notifier); |
| v4l2_async_notifier_cleanup(&csi->notifier); |
| vb2_video_unregister_device(&csi->vdev); |
| media_device_unregister(&csi->mdev); |
| sun4i_csi_dma_unregister(csi); |
| media_device_cleanup(&csi->mdev); |
| |
| return 0; |
| } |
| |
| static const struct sun4i_csi_traits sun4i_a10_csi1_traits = { |
| .channels = 1, |
| .max_width = 24, |
| .has_isp = false, |
| }; |
| |
| static const struct sun4i_csi_traits sun7i_a20_csi0_traits = { |
| .channels = 4, |
| .max_width = 16, |
| .has_isp = true, |
| }; |
| |
| static const struct of_device_id sun4i_csi_of_match[] = { |
| { .compatible = "allwinner,sun4i-a10-csi1", .data = &sun4i_a10_csi1_traits }, |
| { .compatible = "allwinner,sun7i-a20-csi0", .data = &sun7i_a20_csi0_traits }, |
| { /* Sentinel */ } |
| }; |
| MODULE_DEVICE_TABLE(of, sun4i_csi_of_match); |
| |
| static int __maybe_unused sun4i_csi_runtime_resume(struct device *dev) |
| { |
| struct sun4i_csi *csi = dev_get_drvdata(dev); |
| |
| reset_control_deassert(csi->rst); |
| clk_prepare_enable(csi->bus_clk); |
| clk_prepare_enable(csi->ram_clk); |
| clk_set_rate(csi->isp_clk, 80000000); |
| clk_prepare_enable(csi->isp_clk); |
| |
| writel(1, csi->regs + CSI_EN_REG); |
| |
| return 0; |
| } |
| |
| static int __maybe_unused sun4i_csi_runtime_suspend(struct device *dev) |
| { |
| struct sun4i_csi *csi = dev_get_drvdata(dev); |
| |
| clk_disable_unprepare(csi->isp_clk); |
| clk_disable_unprepare(csi->ram_clk); |
| clk_disable_unprepare(csi->bus_clk); |
| |
| reset_control_assert(csi->rst); |
| |
| return 0; |
| } |
| |
| static const struct dev_pm_ops sun4i_csi_pm_ops = { |
| SET_RUNTIME_PM_OPS(sun4i_csi_runtime_suspend, |
| sun4i_csi_runtime_resume, |
| NULL) |
| }; |
| |
| static struct platform_driver sun4i_csi_driver = { |
| .probe = sun4i_csi_probe, |
| .remove = sun4i_csi_remove, |
| .driver = { |
| .name = "sun4i-csi", |
| .of_match_table = sun4i_csi_of_match, |
| .pm = &sun4i_csi_pm_ops, |
| }, |
| }; |
| module_platform_driver(sun4i_csi_driver); |
| |
| MODULE_DESCRIPTION("Allwinner A10 Camera Sensor Interface driver"); |
| MODULE_AUTHOR("Maxime Ripard <mripard@kernel.org>"); |
| MODULE_LICENSE("GPL"); |