drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2016 NextThing Co
   4  * Copyright (C) 2016-2019 Bootlin
   5  *
   6  * Author: Maxime Ripard <maxime.ripard@bootlin.com>
   7  */
   8
   9 #include <linux/clk.h>
  10 #include <linux/dma-mapping.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/module.h>
  13 #include <linux/mutex.h>
  14 #include <linux/of.h>
  15 #include <linux/of_graph.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/pm_runtime.h>
  18 #include <linux/reset.h>
  19 #include <linux/videodev2.h>
  20
  21 #include <media/v4l2-dev.h>
  22 #include <media/v4l2-device.h>
  23 #include <media/v4l2-fwnode.h>
  24 #include <media/v4l2-ioctl.h>
  25 #include <media/v4l2-mediabus.h>
  26
  27 #include <media/videobuf2-core.h>
  28 #include <media/videobuf2-dma-contig.h>
  29
  30 #include "sun4i_csi.h"
  31
  32 struct sun4i_csi_traits {
  33         unsigned int channels;
  34         unsigned int max_width;
  35         bool has_isp;
  36 };
  37
  38 static const struct media_entity_operations sun4i_csi_video_entity_ops = {
  39         .link_validate = v4l2_subdev_link_validate,
  40 };
  41
  42 static int sun4i_csi_notify_bound(struct v4l2_async_notifier *notifier,
  43                                   struct v4l2_subdev *subdev,
  44                                   struct v4l2_async_connection *asd)
  45 {
  46         struct sun4i_csi *csi = container_of(notifier, struct sun4i_csi,
  47                                              notifier);
  48
  49         csi->src_subdev = subdev;
  50         csi->src_pad = media_entity_get_fwnode_pad(&subdev->entity,
  51                                                    subdev->fwnode,
  52                                                    MEDIA_PAD_FL_SOURCE);
  53         if (csi->src_pad < 0) {
  54                 dev_err(csi->dev, "Couldn't find output pad for subdev %s\n",
  55                         subdev->name);
  56                 return csi->src_pad;
  57         }
  58
  59         dev_dbg(csi->dev, "Bound %s pad: %d\n", subdev->name, csi->src_pad);
  60         return 0;
  61 }
  62
  63 static int sun4i_csi_notify_complete(struct v4l2_async_notifier *notifier)
  64 {
  65         struct sun4i_csi *csi = container_of(notifier, struct sun4i_csi,
  66                                              notifier);
  67         struct v4l2_subdev *subdev = &csi->subdev;
  68         struct video_device *vdev = &csi->vdev;
  69         int ret;
  70
  71         ret = v4l2_device_register_subdev(&csi->v4l, subdev);
  72         if (ret < 0)
  73                 return ret;
  74
  75         ret = sun4i_csi_v4l2_register(csi);
  76         if (ret < 0)
  77                 return ret;
  78
  79         ret = media_device_register(&csi->mdev);
  80         if (ret)
  81                 return ret;
  82
  83         /* Create link from subdev to main device */
  84         ret = media_create_pad_link(&subdev->entity, CSI_SUBDEV_SOURCE,
  85                                     &vdev->entity, 0,
  86                                     MEDIA_LNK_FL_ENABLED |
  87                                     MEDIA_LNK_FL_IMMUTABLE);
  88         if (ret)
  89                 goto err_clean_media;
  90
  91         ret = media_create_pad_link(&csi->src_subdev->entity, csi->src_pad,
  92                                     &subdev->entity, CSI_SUBDEV_SINK,
  93                                     MEDIA_LNK_FL_ENABLED |
  94                                     MEDIA_LNK_FL_IMMUTABLE);
  95         if (ret)
  96                 goto err_clean_media;
  97
  98         ret = v4l2_device_register_subdev_nodes(&csi->v4l);
  99         if (ret < 0)
 100                 goto err_clean_media;
 101
 102         return 0;
 103
 104 err_clean_media:
 105         media_device_unregister(&csi->mdev);
 106
 107         return ret;
 108 }
 109
 110 static const struct v4l2_async_notifier_operations sun4i_csi_notify_ops = {
 111         .bound          = sun4i_csi_notify_bound,
 112         .complete       = sun4i_csi_notify_complete,
 113 };
 114
 115 static int sun4i_csi_notifier_init(struct sun4i_csi *csi)
 116 {
 117         struct v4l2_fwnode_endpoint vep = {
 118                 .bus_type = V4L2_MBUS_PARALLEL,
 119         };
 120         struct v4l2_async_connection *asd;
 121         struct fwnode_handle *ep;
 122         int ret;
 123
 124         v4l2_async_nf_init(&csi->notifier);
 125
 126         ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(csi->dev), 0, 0,
 127                                              FWNODE_GRAPH_ENDPOINT_NEXT);
 128         if (!ep)
 129                 return -EINVAL;
 130
 131         ret = v4l2_fwnode_endpoint_parse(ep, &vep);
 132         if (ret)
 133                 goto out;
 134
 135         csi->bus = vep.bus.parallel;
 136
 137         asd = v4l2_async_nf_add_fwnode_remote(&csi->notifier, ep,
 138                                               struct v4l2_async_connection);
 139         if (IS_ERR(asd)) {
 140                 ret = PTR_ERR(asd);
 141                 goto out;
 142         }
 143
 144         csi->notifier.ops = &sun4i_csi_notify_ops;
 145
 146 out:
 147         fwnode_handle_put(ep);
 148         return ret;
 149 }
 150
 151 static int sun4i_csi_probe(struct platform_device *pdev)
 152 {
 153         struct v4l2_subdev *subdev;
 154         struct video_device *vdev;
 155         struct sun4i_csi *csi;
 156         int ret;
 157         int irq;
 158
 159         csi = devm_kzalloc(&pdev->dev, sizeof(*csi), GFP_KERNEL);
 160         if (!csi)
 161                 return -ENOMEM;
 162         platform_set_drvdata(pdev, csi);
 163         csi->dev = &pdev->dev;
 164         subdev = &csi->subdev;
 165         vdev = &csi->vdev;
 166
 167         csi->traits = of_device_get_match_data(&pdev->dev);
 168         if (!csi->traits)
 169                 return -EINVAL;
 170
 171         csi->mdev.dev = csi->dev;
 172         strscpy(csi->mdev.model, "Allwinner Video Capture Device",
 173                 sizeof(csi->mdev.model));
 174         csi->mdev.hw_revision = 0;
 175         media_device_init(&csi->mdev);
 176         csi->v4l.mdev = &csi->mdev;
 177
 178         csi->regs = devm_platform_ioremap_resource(pdev, 0);
 179         if (IS_ERR(csi->regs))
 180                 return PTR_ERR(csi->regs);
 181
 182         irq = platform_get_irq(pdev, 0);
 183         if (irq < 0)
 184                 return irq;
 185
 186         csi->bus_clk = devm_clk_get(&pdev->dev, "bus");
 187         if (IS_ERR(csi->bus_clk)) {
 188                 dev_err(&pdev->dev, "Couldn't get our bus clock\n");
 189                 return PTR_ERR(csi->bus_clk);
 190         }
 191
 192         if (csi->traits->has_isp) {
 193                 csi->isp_clk = devm_clk_get(&pdev->dev, "isp");
 194                 if (IS_ERR(csi->isp_clk)) {
 195                         dev_err(&pdev->dev, "Couldn't get our ISP clock\n");
 196                         return PTR_ERR(csi->isp_clk);
 197                 }
 198         }
 199
 200         csi->ram_clk = devm_clk_get(&pdev->dev, "ram");
 201         if (IS_ERR(csi->ram_clk)) {
 202                 dev_err(&pdev->dev, "Couldn't get our ram clock\n");
 203                 return PTR_ERR(csi->ram_clk);
 204         }
 205
 206         csi->rst = devm_reset_control_get(&pdev->dev, NULL);
 207         if (IS_ERR(csi->rst)) {
 208                 dev_err(&pdev->dev, "Couldn't get our reset line\n");
 209                 return PTR_ERR(csi->rst);
 210         }
 211
 212         /* Initialize subdev */
 213         v4l2_subdev_init(subdev, &sun4i_csi_subdev_ops);
 214         subdev->flags = V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS;
 215         subdev->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
 216         subdev->owner = THIS_MODULE;
 217         snprintf(subdev->name, sizeof(subdev->name), "sun4i-csi-0");
 218         v4l2_set_subdevdata(subdev, csi);
 219
 220         csi->subdev_pads[CSI_SUBDEV_SINK].flags =
 221                 MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT;
 222         csi->subdev_pads[CSI_SUBDEV_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
 223         ret = media_entity_pads_init(&subdev->entity, CSI_SUBDEV_PADS,
 224                                      csi->subdev_pads);
 225         if (ret < 0)
 226                 return ret;
 227
 228         csi->vdev_pad.flags = MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT;
 229         vdev->entity.ops = &sun4i_csi_video_entity_ops;
 230         ret = media_entity_pads_init(&vdev->entity, 1, &csi->vdev_pad);
 231         if (ret < 0)
 232                 return ret;
 233
 234         ret = sun4i_csi_dma_register(csi, irq);
 235         if (ret)
 236                 goto err_clean_pad;
 237
 238         ret = sun4i_csi_notifier_init(csi);
 239         if (ret)
 240                 goto err_unregister_media;
 241
 242         ret = v4l2_async_nf_register(&csi->v4l, &csi->notifier);
 243         if (ret) {
 244                 dev_err(csi->dev, "Couldn't register our notifier.\n");
 245                 goto err_unregister_media;
 246         }
 247
 248         pm_runtime_enable(&pdev->dev);
 249
 250         return 0;
 251
 252 err_unregister_media:
 253         media_device_unregister(&csi->mdev);
 254         sun4i_csi_dma_unregister(csi);
 255
 256 err_clean_pad:
 257         media_device_cleanup(&csi->mdev);
 258
 259         return ret;
 260 }
 261
 262 static void sun4i_csi_remove(struct platform_device *pdev)
 263 {
 264         struct sun4i_csi *csi = platform_get_drvdata(pdev);
 265
 266         pm_runtime_disable(&pdev->dev);
 267         v4l2_async_nf_unregister(&csi->notifier);
 268         v4l2_async_nf_cleanup(&csi->notifier);
 269         vb2_video_unregister_device(&csi->vdev);
 270         media_device_unregister(&csi->mdev);
 271         sun4i_csi_dma_unregister(csi);
 272         media_device_cleanup(&csi->mdev);
 273 }
 274
 275 static const struct sun4i_csi_traits sun4i_a10_csi1_traits = {
 276         .channels = 1,
 277         .max_width = 24,
 278         .has_isp = false,
 279 };
 280
 281 static const struct sun4i_csi_traits sun7i_a20_csi0_traits = {
 282         .channels = 4,
 283         .max_width = 16,
 284         .has_isp = true,
 285 };
 286
 287 static const struct of_device_id sun4i_csi_of_match[] = {
 288         { .compatible = "allwinner,sun4i-a10-csi1", .data = &sun4i_a10_csi1_traits },
 289         { .compatible = "allwinner,sun7i-a20-csi0", .data = &sun7i_a20_csi0_traits },
 290         { /* Sentinel */ }
 291 };
 292 MODULE_DEVICE_TABLE(of, sun4i_csi_of_match);
 293
 294 static int __maybe_unused sun4i_csi_runtime_resume(struct device *dev)
 295 {
 296         struct sun4i_csi *csi = dev_get_drvdata(dev);
 297
 298         reset_control_deassert(csi->rst);
 299         clk_prepare_enable(csi->bus_clk);
 300         clk_prepare_enable(csi->ram_clk);
 301         clk_set_rate(csi->isp_clk, 80000000);
 302         clk_prepare_enable(csi->isp_clk);
 303
 304         writel(1, csi->regs + CSI_EN_REG);
 305
 306         return 0;
 307 }
 308
 309 static int __maybe_unused sun4i_csi_runtime_suspend(struct device *dev)
 310 {
 311         struct sun4i_csi *csi = dev_get_drvdata(dev);
 312
 313         clk_disable_unprepare(csi->isp_clk);
 314         clk_disable_unprepare(csi->ram_clk);
 315         clk_disable_unprepare(csi->bus_clk);
 316
 317         reset_control_assert(csi->rst);
 318
 319         return 0;
 320 }
 321
 322 static const struct dev_pm_ops sun4i_csi_pm_ops = {
 323         SET_RUNTIME_PM_OPS(sun4i_csi_runtime_suspend,
 324                            sun4i_csi_runtime_resume,
 325                            NULL)
 326 };
 327
 328 static struct platform_driver sun4i_csi_driver = {
 329         .probe  = sun4i_csi_probe,
 330         .remove_new = sun4i_csi_remove,
 331         .driver = {
 332                 .name           = "sun4i-csi",
 333                 .of_match_table = sun4i_csi_of_match,
 334                 .pm             = &sun4i_csi_pm_ops,
 335         },
 336 };
 337 module_platform_driver(sun4i_csi_driver);
 338
 339 MODULE_DESCRIPTION("Allwinner A10 Camera Sensor Interface driver");
 340 MODULE_AUTHOR("Maxime Ripard <mripard@kernel.org>");
 341 MODULE_LICENSE("GPL");