// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2016 NextThing Co
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* Copyright (C) 2016-2019 Bootlin
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*
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* Author: Maxime Ripard <maxime.ripard@bootlin.com>
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*/
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#include <linux/clk.h>
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#include <linux/dma-mapping.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/of_graph.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/reset.h>
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#include <linux/videodev2.h>
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#include <media/v4l2-dev.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-fwnode.h>
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#include <media/v4l2-ioctl.h>
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#include <media/v4l2-mediabus.h>
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#include <media/videobuf2-core.h>
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#include <media/videobuf2-dma-contig.h>
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#include "sun4i_csi.h"
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struct sun4i_csi_traits {
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unsigned int channels;
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unsigned int max_width;
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bool has_isp;
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};
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static const struct media_entity_operations sun4i_csi_video_entity_ops = {
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.link_validate = v4l2_subdev_link_validate,
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};
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static int sun4i_csi_notify_bound(struct v4l2_async_notifier *notifier,
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struct v4l2_subdev *subdev,
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struct v4l2_async_subdev *asd)
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{
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struct sun4i_csi *csi = container_of(notifier, struct sun4i_csi,
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notifier);
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csi->src_subdev = subdev;
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csi->src_pad = media_entity_get_fwnode_pad(&subdev->entity,
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subdev->fwnode,
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MEDIA_PAD_FL_SOURCE);
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if (csi->src_pad < 0) {
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dev_err(csi->dev, "Couldn't find output pad for subdev %s\n",
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subdev->name);
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return csi->src_pad;
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}
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dev_dbg(csi->dev, "Bound %s pad: %d\n", subdev->name, csi->src_pad);
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return 0;
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}
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static int sun4i_csi_notify_complete(struct v4l2_async_notifier *notifier)
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{
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struct sun4i_csi *csi = container_of(notifier, struct sun4i_csi,
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notifier);
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struct v4l2_subdev *subdev = &csi->subdev;
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struct video_device *vdev = &csi->vdev;
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int ret;
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ret = v4l2_device_register_subdev(&csi->v4l, subdev);
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if (ret < 0)
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return ret;
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ret = sun4i_csi_v4l2_register(csi);
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if (ret < 0)
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return ret;
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ret = media_device_register(&csi->mdev);
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if (ret)
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return ret;
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/* Create link from subdev to main device */
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ret = media_create_pad_link(&subdev->entity, CSI_SUBDEV_SOURCE,
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&vdev->entity, 0,
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MEDIA_LNK_FL_ENABLED |
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MEDIA_LNK_FL_IMMUTABLE);
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if (ret)
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goto err_clean_media;
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ret = media_create_pad_link(&csi->src_subdev->entity, csi->src_pad,
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&subdev->entity, CSI_SUBDEV_SINK,
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MEDIA_LNK_FL_ENABLED |
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MEDIA_LNK_FL_IMMUTABLE);
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if (ret)
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goto err_clean_media;
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ret = v4l2_device_register_subdev_nodes(&csi->v4l);
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if (ret < 0)
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goto err_clean_media;
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return 0;
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err_clean_media:
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media_device_unregister(&csi->mdev);
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return ret;
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}
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static const struct v4l2_async_notifier_operations sun4i_csi_notify_ops = {
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.bound = sun4i_csi_notify_bound,
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.complete = sun4i_csi_notify_complete,
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};
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static int sun4i_csi_notifier_init(struct sun4i_csi *csi)
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{
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struct v4l2_fwnode_endpoint vep = {
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.bus_type = V4L2_MBUS_PARALLEL,
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};
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struct v4l2_async_subdev *asd;
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struct fwnode_handle *ep;
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int ret;
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v4l2_async_notifier_init(&csi->notifier);
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ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(csi->dev), 0, 0,
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FWNODE_GRAPH_ENDPOINT_NEXT);
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if (!ep)
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return -EINVAL;
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ret = v4l2_fwnode_endpoint_parse(ep, &vep);
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if (ret)
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goto out;
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csi->bus = vep.bus.parallel;
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asd = v4l2_async_notifier_add_fwnode_remote_subdev(&csi->notifier,
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ep, sizeof(*asd));
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if (IS_ERR(asd)) {
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ret = PTR_ERR(asd);
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goto out;
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}
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csi->notifier.ops = &sun4i_csi_notify_ops;
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out:
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fwnode_handle_put(ep);
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return ret;
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}
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static int sun4i_csi_probe(struct platform_device *pdev)
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{
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struct v4l2_subdev *subdev;
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struct video_device *vdev;
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struct sun4i_csi *csi;
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struct resource *res;
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int ret;
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int irq;
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csi = devm_kzalloc(&pdev->dev, sizeof(*csi), GFP_KERNEL);
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if (!csi)
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return -ENOMEM;
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platform_set_drvdata(pdev, csi);
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csi->dev = &pdev->dev;
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subdev = &csi->subdev;
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vdev = &csi->vdev;
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csi->traits = of_device_get_match_data(&pdev->dev);
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if (!csi->traits)
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return -EINVAL;
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/*
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* On Allwinner SoCs, some high memory bandwidth devices do DMA
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* directly over the memory bus (called MBUS), instead of the
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* system bus. The memory bus has a different addressing scheme
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* without the DRAM starting offset.
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*
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* In some cases this can be described by an interconnect in
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* the device tree. In other cases where the hardware is not
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* fully understood and the interconnect is left out of the
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* device tree, fall back to a default offset.
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*/
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if (of_find_property(csi->dev->of_node, "interconnects", NULL)) {
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ret = of_dma_configure(csi->dev, csi->dev->of_node, true);
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if (ret)
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return ret;
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} else {
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/*
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* XXX(hch): this has no business in a driver and needs to move
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* to the device tree.
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*/
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#ifdef PHYS_PFN_OFFSET
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ret = dma_direct_set_offset(csi->dev, PHYS_OFFSET, 0, SZ_4G);
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if (ret)
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return ret;
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#endif
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}
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csi->mdev.dev = csi->dev;
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strscpy(csi->mdev.model, "Allwinner Video Capture Device",
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sizeof(csi->mdev.model));
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csi->mdev.hw_revision = 0;
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snprintf(csi->mdev.bus_info, sizeof(csi->mdev.bus_info), "platform:%s",
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dev_name(csi->dev));
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media_device_init(&csi->mdev);
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csi->v4l.mdev = &csi->mdev;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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csi->regs = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(csi->regs))
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return PTR_ERR(csi->regs);
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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return irq;
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csi->bus_clk = devm_clk_get(&pdev->dev, "bus");
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if (IS_ERR(csi->bus_clk)) {
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dev_err(&pdev->dev, "Couldn't get our bus clock\n");
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return PTR_ERR(csi->bus_clk);
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}
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if (csi->traits->has_isp) {
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csi->isp_clk = devm_clk_get(&pdev->dev, "isp");
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if (IS_ERR(csi->isp_clk)) {
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dev_err(&pdev->dev, "Couldn't get our ISP clock\n");
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return PTR_ERR(csi->isp_clk);
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}
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}
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csi->ram_clk = devm_clk_get(&pdev->dev, "ram");
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if (IS_ERR(csi->ram_clk)) {
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dev_err(&pdev->dev, "Couldn't get our ram clock\n");
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return PTR_ERR(csi->ram_clk);
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}
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csi->rst = devm_reset_control_get(&pdev->dev, NULL);
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if (IS_ERR(csi->rst)) {
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dev_err(&pdev->dev, "Couldn't get our reset line\n");
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return PTR_ERR(csi->rst);
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}
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/* Initialize subdev */
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v4l2_subdev_init(subdev, &sun4i_csi_subdev_ops);
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subdev->flags = V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS;
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subdev->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
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subdev->owner = THIS_MODULE;
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snprintf(subdev->name, sizeof(subdev->name), "sun4i-csi-0");
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v4l2_set_subdevdata(subdev, csi);
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csi->subdev_pads[CSI_SUBDEV_SINK].flags =
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MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT;
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csi->subdev_pads[CSI_SUBDEV_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
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ret = media_entity_pads_init(&subdev->entity, CSI_SUBDEV_PADS,
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csi->subdev_pads);
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if (ret < 0)
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return ret;
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csi->vdev_pad.flags = MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT;
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vdev->entity.ops = &sun4i_csi_video_entity_ops;
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ret = media_entity_pads_init(&vdev->entity, 1, &csi->vdev_pad);
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if (ret < 0)
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return ret;
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ret = sun4i_csi_dma_register(csi, irq);
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if (ret)
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goto err_clean_pad;
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ret = sun4i_csi_notifier_init(csi);
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if (ret)
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goto err_unregister_media;
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ret = v4l2_async_notifier_register(&csi->v4l, &csi->notifier);
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if (ret) {
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dev_err(csi->dev, "Couldn't register our notifier.\n");
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goto err_unregister_media;
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}
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pm_runtime_enable(&pdev->dev);
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return 0;
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err_unregister_media:
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media_device_unregister(&csi->mdev);
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sun4i_csi_dma_unregister(csi);
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err_clean_pad:
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media_device_cleanup(&csi->mdev);
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return ret;
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}
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static int sun4i_csi_remove(struct platform_device *pdev)
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{
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struct sun4i_csi *csi = platform_get_drvdata(pdev);
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v4l2_async_notifier_unregister(&csi->notifier);
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v4l2_async_notifier_cleanup(&csi->notifier);
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vb2_video_unregister_device(&csi->vdev);
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media_device_unregister(&csi->mdev);
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sun4i_csi_dma_unregister(csi);
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media_device_cleanup(&csi->mdev);
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return 0;
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}
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static const struct sun4i_csi_traits sun4i_a10_csi1_traits = {
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.channels = 1,
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.max_width = 24,
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.has_isp = false,
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};
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static const struct sun4i_csi_traits sun7i_a20_csi0_traits = {
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.channels = 4,
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.max_width = 16,
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.has_isp = true,
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};
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static const struct of_device_id sun4i_csi_of_match[] = {
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{ .compatible = "allwinner,sun4i-a10-csi1", .data = &sun4i_a10_csi1_traits },
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{ .compatible = "allwinner,sun7i-a20-csi0", .data = &sun7i_a20_csi0_traits },
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{ /* Sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, sun4i_csi_of_match);
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static int __maybe_unused sun4i_csi_runtime_resume(struct device *dev)
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{
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struct sun4i_csi *csi = dev_get_drvdata(dev);
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reset_control_deassert(csi->rst);
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clk_prepare_enable(csi->bus_clk);
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clk_prepare_enable(csi->ram_clk);
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clk_set_rate(csi->isp_clk, 80000000);
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clk_prepare_enable(csi->isp_clk);
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writel(1, csi->regs + CSI_EN_REG);
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return 0;
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}
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static int __maybe_unused sun4i_csi_runtime_suspend(struct device *dev)
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{
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struct sun4i_csi *csi = dev_get_drvdata(dev);
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clk_disable_unprepare(csi->isp_clk);
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clk_disable_unprepare(csi->ram_clk);
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clk_disable_unprepare(csi->bus_clk);
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reset_control_assert(csi->rst);
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return 0;
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}
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static const struct dev_pm_ops sun4i_csi_pm_ops = {
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SET_RUNTIME_PM_OPS(sun4i_csi_runtime_suspend,
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sun4i_csi_runtime_resume,
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NULL)
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};
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static struct platform_driver sun4i_csi_driver = {
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.probe = sun4i_csi_probe,
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.remove = sun4i_csi_remove,
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.driver = {
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.name = "sun4i-csi",
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.of_match_table = sun4i_csi_of_match,
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.pm = &sun4i_csi_pm_ops,
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},
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};
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module_platform_driver(sun4i_csi_driver);
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MODULE_DESCRIPTION("Allwinner A10 Camera Sensor Interface driver");
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MODULE_AUTHOR("Maxime Ripard <mripard@kernel.org>");
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MODULE_LICENSE("GPL");
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