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_device.h> 16 #include <linux/of_graph.h> 17 #include <linux/platform_device.h> 18 #include <linux/pm_runtime.h> 19 #include <linux/reset.h> 20 #include <linux/videodev2.h> 21 22 #include <media/v4l2-dev.h> 23 #include <media/v4l2-device.h> 24 #include <media/v4l2-fwnode.h> 25 #include <media/v4l2-ioctl.h> 26 #include <media/v4l2-mediabus.h> 27 28 #include <media/videobuf2-core.h> 29 #include <media/videobuf2-dma-contig.h> 30 31 #include "sun4i_csi.h" 32 33 struct sun4i_csi_traits { 34 unsigned int channels; 35 unsigned int max_width; 36 bool has_isp; 37 }; 38 39 static const struct media_entity_operations sun4i_csi_video_entity_ops = { 40 .link_validate = v4l2_subdev_link_validate, 41 }; 42 43 static int sun4i_csi_notify_bound(struct v4l2_async_notifier *notifier, 44 struct v4l2_subdev *subdev, 45 struct v4l2_async_subdev *asd) 46 { 47 struct sun4i_csi *csi = container_of(notifier, struct sun4i_csi, 48 notifier); 49 50 csi->src_subdev = subdev; 51 csi->src_pad = media_entity_get_fwnode_pad(&subdev->entity, 52 subdev->fwnode, 53 MEDIA_PAD_FL_SOURCE); 54 if (csi->src_pad < 0) { 55 dev_err(csi->dev, "Couldn't find output pad for subdev %s\n", 56 subdev->name); 57 return csi->src_pad; 58 } 59 60 dev_dbg(csi->dev, "Bound %s pad: %d\n", subdev->name, csi->src_pad); 61 return 0; 62 } 63 64 static int sun4i_csi_notify_complete(struct v4l2_async_notifier *notifier) 65 { 66 struct sun4i_csi *csi = container_of(notifier, struct sun4i_csi, 67 notifier); 68 struct v4l2_subdev *subdev = &csi->subdev; 69 struct video_device *vdev = &csi->vdev; 70 int ret; 71 72 ret = v4l2_device_register_subdev(&csi->v4l, subdev); 73 if (ret < 0) 74 return ret; 75 76 ret = sun4i_csi_v4l2_register(csi); 77 if (ret < 0) 78 return ret; 79 80 ret = media_device_register(&csi->mdev); 81 if (ret) 82 return ret; 83 84 /* Create link from subdev to main device */ 85 ret = media_create_pad_link(&subdev->entity, CSI_SUBDEV_SOURCE, 86 &vdev->entity, 0, 87 MEDIA_LNK_FL_ENABLED | 88 MEDIA_LNK_FL_IMMUTABLE); 89 if (ret) 90 goto err_clean_media; 91 92 ret = media_create_pad_link(&csi->src_subdev->entity, csi->src_pad, 93 &subdev->entity, CSI_SUBDEV_SINK, 94 MEDIA_LNK_FL_ENABLED | 95 MEDIA_LNK_FL_IMMUTABLE); 96 if (ret) 97 goto err_clean_media; 98 99 ret = v4l2_device_register_subdev_nodes(&csi->v4l); 100 if (ret < 0) 101 goto err_clean_media; 102 103 return 0; 104 105 err_clean_media: 106 media_device_unregister(&csi->mdev); 107 108 return ret; 109 } 110 111 static const struct v4l2_async_notifier_operations sun4i_csi_notify_ops = { 112 .bound = sun4i_csi_notify_bound, 113 .complete = sun4i_csi_notify_complete, 114 }; 115 116 static int sun4i_csi_notifier_init(struct sun4i_csi *csi) 117 { 118 struct v4l2_fwnode_endpoint vep = { 119 .bus_type = V4L2_MBUS_PARALLEL, 120 }; 121 struct fwnode_handle *ep; 122 int ret; 123 124 v4l2_async_notifier_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 ret = v4l2_async_notifier_add_fwnode_remote_subdev(&csi->notifier, 138 ep, &csi->asd); 139 if (ret) 140 goto out; 141 142 csi->notifier.ops = &sun4i_csi_notify_ops; 143 144 out: 145 fwnode_handle_put(ep); 146 return ret; 147 } 148 149 static int sun4i_csi_probe(struct platform_device *pdev) 150 { 151 struct v4l2_subdev *subdev; 152 struct video_device *vdev; 153 struct sun4i_csi *csi; 154 struct resource *res; 155 int ret; 156 int irq; 157 158 csi = devm_kzalloc(&pdev->dev, sizeof(*csi), GFP_KERNEL); 159 if (!csi) 160 return -ENOMEM; 161 platform_set_drvdata(pdev, csi); 162 csi->dev = &pdev->dev; 163 subdev = &csi->subdev; 164 vdev = &csi->vdev; 165 166 csi->traits = of_device_get_match_data(&pdev->dev); 167 if (!csi->traits) 168 return -EINVAL; 169 170 csi->mdev.dev = csi->dev; 171 strscpy(csi->mdev.model, "Allwinner Video Capture Device", 172 sizeof(csi->mdev.model)); 173 csi->mdev.hw_revision = 0; 174 snprintf(csi->mdev.bus_info, sizeof(csi->mdev.bus_info), "platform:%s", 175 dev_name(csi->dev)); 176 media_device_init(&csi->mdev); 177 csi->v4l.mdev = &csi->mdev; 178 179 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 180 csi->regs = devm_ioremap_resource(&pdev->dev, res); 181 if (IS_ERR(csi->regs)) 182 return PTR_ERR(csi->regs); 183 184 irq = platform_get_irq(pdev, 0); 185 if (irq < 0) 186 return irq; 187 188 csi->bus_clk = devm_clk_get(&pdev->dev, "bus"); 189 if (IS_ERR(csi->bus_clk)) { 190 dev_err(&pdev->dev, "Couldn't get our bus clock\n"); 191 return PTR_ERR(csi->bus_clk); 192 } 193 194 if (csi->traits->has_isp) { 195 csi->isp_clk = devm_clk_get(&pdev->dev, "isp"); 196 if (IS_ERR(csi->isp_clk)) { 197 dev_err(&pdev->dev, "Couldn't get our ISP clock\n"); 198 return PTR_ERR(csi->isp_clk); 199 } 200 } 201 202 csi->ram_clk = devm_clk_get(&pdev->dev, "ram"); 203 if (IS_ERR(csi->ram_clk)) { 204 dev_err(&pdev->dev, "Couldn't get our ram clock\n"); 205 return PTR_ERR(csi->ram_clk); 206 } 207 208 csi->rst = devm_reset_control_get(&pdev->dev, NULL); 209 if (IS_ERR(csi->rst)) { 210 dev_err(&pdev->dev, "Couldn't get our reset line\n"); 211 return PTR_ERR(csi->rst); 212 } 213 214 /* Initialize subdev */ 215 v4l2_subdev_init(subdev, &sun4i_csi_subdev_ops); 216 subdev->flags = V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS; 217 subdev->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE; 218 subdev->owner = THIS_MODULE; 219 snprintf(subdev->name, sizeof(subdev->name), "sun4i-csi-0"); 220 v4l2_set_subdevdata(subdev, csi); 221 222 csi->subdev_pads[CSI_SUBDEV_SINK].flags = 223 MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT; 224 csi->subdev_pads[CSI_SUBDEV_SOURCE].flags = MEDIA_PAD_FL_SOURCE; 225 ret = media_entity_pads_init(&subdev->entity, CSI_SUBDEV_PADS, 226 csi->subdev_pads); 227 if (ret < 0) 228 return ret; 229 230 csi->vdev_pad.flags = MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT; 231 vdev->entity.ops = &sun4i_csi_video_entity_ops; 232 ret = media_entity_pads_init(&vdev->entity, 1, &csi->vdev_pad); 233 if (ret < 0) 234 return ret; 235 236 ret = sun4i_csi_dma_register(csi, irq); 237 if (ret) 238 goto err_clean_pad; 239 240 ret = sun4i_csi_notifier_init(csi); 241 if (ret) 242 goto err_unregister_media; 243 244 ret = v4l2_async_notifier_register(&csi->v4l, &csi->notifier); 245 if (ret) { 246 dev_err(csi->dev, "Couldn't register our notifier.\n"); 247 goto err_unregister_media; 248 } 249 250 pm_runtime_enable(&pdev->dev); 251 252 return 0; 253 254 err_unregister_media: 255 media_device_unregister(&csi->mdev); 256 sun4i_csi_dma_unregister(csi); 257 258 err_clean_pad: 259 media_device_cleanup(&csi->mdev); 260 261 return ret; 262 } 263 264 static int sun4i_csi_remove(struct platform_device *pdev) 265 { 266 struct sun4i_csi *csi = platform_get_drvdata(pdev); 267 268 v4l2_async_notifier_unregister(&csi->notifier); 269 v4l2_async_notifier_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 return 0; 276 } 277 278 static const struct sun4i_csi_traits sun4i_a10_csi1_traits = { 279 .channels = 1, 280 .max_width = 24, 281 .has_isp = false, 282 }; 283 284 static const struct sun4i_csi_traits sun7i_a20_csi0_traits = { 285 .channels = 4, 286 .max_width = 16, 287 .has_isp = true, 288 }; 289 290 static const struct of_device_id sun4i_csi_of_match[] = { 291 { .compatible = "allwinner,sun4i-a10-csi1", .data = &sun4i_a10_csi1_traits }, 292 { .compatible = "allwinner,sun7i-a20-csi0", .data = &sun7i_a20_csi0_traits }, 293 { /* Sentinel */ } 294 }; 295 MODULE_DEVICE_TABLE(of, sun4i_csi_of_match); 296 297 static int __maybe_unused sun4i_csi_runtime_resume(struct device *dev) 298 { 299 struct sun4i_csi *csi = dev_get_drvdata(dev); 300 301 reset_control_deassert(csi->rst); 302 clk_prepare_enable(csi->bus_clk); 303 clk_prepare_enable(csi->ram_clk); 304 clk_set_rate(csi->isp_clk, 80000000); 305 clk_prepare_enable(csi->isp_clk); 306 307 writel(1, csi->regs + CSI_EN_REG); 308 309 return 0; 310 } 311 312 static int __maybe_unused sun4i_csi_runtime_suspend(struct device *dev) 313 { 314 struct sun4i_csi *csi = dev_get_drvdata(dev); 315 316 clk_disable_unprepare(csi->isp_clk); 317 clk_disable_unprepare(csi->ram_clk); 318 clk_disable_unprepare(csi->bus_clk); 319 320 reset_control_assert(csi->rst); 321 322 return 0; 323 } 324 325 static const struct dev_pm_ops sun4i_csi_pm_ops = { 326 SET_RUNTIME_PM_OPS(sun4i_csi_runtime_suspend, 327 sun4i_csi_runtime_resume, 328 NULL) 329 }; 330 331 static struct platform_driver sun4i_csi_driver = { 332 .probe = sun4i_csi_probe, 333 .remove = sun4i_csi_remove, 334 .driver = { 335 .name = "sun4i-csi", 336 .of_match_table = sun4i_csi_of_match, 337 .pm = &sun4i_csi_pm_ops, 338 }, 339 }; 340 module_platform_driver(sun4i_csi_driver); 341 342 MODULE_DESCRIPTION("Allwinner A10 Camera Sensor Interface driver"); 343 MODULE_AUTHOR("Maxime Ripard <mripard@kernel.org>"); 344 MODULE_LICENSE("GPL"); 345