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, &csi->v4l); 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->internal_ops = &sun4i_csi_subdev_internal_ops; 215 subdev->flags = V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS; 216 subdev->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE; 217 subdev->owner = THIS_MODULE; 218 snprintf(subdev->name, sizeof(subdev->name), "sun4i-csi-0"); 219 v4l2_set_subdevdata(subdev, csi); 220 221 csi->subdev_pads[CSI_SUBDEV_SINK].flags = 222 MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT; 223 csi->subdev_pads[CSI_SUBDEV_SOURCE].flags = MEDIA_PAD_FL_SOURCE; 224 ret = media_entity_pads_init(&subdev->entity, CSI_SUBDEV_PADS, 225 csi->subdev_pads); 226 if (ret < 0) 227 return ret; 228 229 csi->vdev_pad.flags = MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT; 230 vdev->entity.ops = &sun4i_csi_video_entity_ops; 231 ret = media_entity_pads_init(&vdev->entity, 1, &csi->vdev_pad); 232 if (ret < 0) 233 return ret; 234 235 ret = sun4i_csi_dma_register(csi, irq); 236 if (ret) 237 goto err_clean_pad; 238 239 ret = sun4i_csi_notifier_init(csi); 240 if (ret) 241 goto err_unregister_media; 242 243 ret = v4l2_async_nf_register(&csi->notifier); 244 if (ret) { 245 dev_err(csi->dev, "Couldn't register our notifier.\n"); 246 goto err_unregister_media; 247 } 248 249 pm_runtime_enable(&pdev->dev); 250 251 return 0; 252 253 err_unregister_media: 254 media_device_unregister(&csi->mdev); 255 sun4i_csi_dma_unregister(csi); 256 257 err_clean_pad: 258 media_device_cleanup(&csi->mdev); 259 260 return ret; 261 } 262 263 static void sun4i_csi_remove(struct platform_device *pdev) 264 { 265 struct sun4i_csi *csi = platform_get_drvdata(pdev); 266 267 pm_runtime_disable(&pdev->dev); 268 v4l2_async_nf_unregister(&csi->notifier); 269 v4l2_async_nf_cleanup(&csi->notifier); 270 vb2_video_unregister_device(&csi->vdev); 271 media_device_unregister(&csi->mdev); 272 sun4i_csi_dma_unregister(csi); 273 media_device_cleanup(&csi->mdev); 274 } 275 276 static const struct sun4i_csi_traits sun4i_a10_csi1_traits = { 277 .channels = 1, 278 .max_width = 24, 279 .has_isp = false, 280 }; 281 282 static const struct sun4i_csi_traits sun7i_a20_csi0_traits = { 283 .channels = 4, 284 .max_width = 16, 285 .has_isp = true, 286 }; 287 288 static const struct of_device_id sun4i_csi_of_match[] = { 289 { .compatible = "allwinner,sun4i-a10-csi1", .data = &sun4i_a10_csi1_traits }, 290 { .compatible = "allwinner,sun7i-a20-csi0", .data = &sun7i_a20_csi0_traits }, 291 { /* Sentinel */ } 292 }; 293 MODULE_DEVICE_TABLE(of, sun4i_csi_of_match); 294 295 static int __maybe_unused sun4i_csi_runtime_resume(struct device *dev) 296 { 297 struct sun4i_csi *csi = dev_get_drvdata(dev); 298 299 reset_control_deassert(csi->rst); 300 clk_prepare_enable(csi->bus_clk); 301 clk_prepare_enable(csi->ram_clk); 302 clk_set_rate(csi->isp_clk, 80000000); 303 clk_prepare_enable(csi->isp_clk); 304 305 writel(1, csi->regs + CSI_EN_REG); 306 307 return 0; 308 } 309 310 static int __maybe_unused sun4i_csi_runtime_suspend(struct device *dev) 311 { 312 struct sun4i_csi *csi = dev_get_drvdata(dev); 313 314 clk_disable_unprepare(csi->isp_clk); 315 clk_disable_unprepare(csi->ram_clk); 316 clk_disable_unprepare(csi->bus_clk); 317 318 reset_control_assert(csi->rst); 319 320 return 0; 321 } 322 323 static const struct dev_pm_ops sun4i_csi_pm_ops = { 324 SET_RUNTIME_PM_OPS(sun4i_csi_runtime_suspend, 325 sun4i_csi_runtime_resume, 326 NULL) 327 }; 328 329 static struct platform_driver sun4i_csi_driver = { 330 .probe = sun4i_csi_probe, 331 .remove_new = sun4i_csi_remove, 332 .driver = { 333 .name = "sun4i-csi", 334 .of_match_table = sun4i_csi_of_match, 335 .pm = &sun4i_csi_pm_ops, 336 }, 337 }; 338 module_platform_driver(sun4i_csi_driver); 339 340 MODULE_DESCRIPTION("Allwinner A10 Camera Sensor Interface driver"); 341 MODULE_AUTHOR("Maxime Ripard <mripard@kernel.org>"); 342 MODULE_LICENSE("GPL"); 343