| 1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | /* |
| 3 | * Copyright (c) 2011-2018 Magewell Electronics Co., Ltd. (Nanjing) |
| 4 | * Author: Yong Deng <yong.deng@magewell.com> |
| 5 | * Copyright 2021-2022 Bootlin |
| 6 | * Author: Paul Kocialkowski <paul.kocialkowski@bootlin.com> |
| 7 | */ |
| 8 | |
| 9 | #include <linux/clk.h> |
| 10 | #include <linux/err.h> |
| 11 | #include <linux/interrupt.h> |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/of.h> |
| 14 | #include <linux/platform_device.h> |
| 15 | #include <linux/pm_runtime.h> |
| 16 | #include <linux/regmap.h> |
| 17 | #include <linux/reset.h> |
| 18 | #include <media/v4l2-device.h> |
| 19 | #include <media/v4l2-mc.h> |
| 20 | |
| 21 | #include "sun6i_csi.h" |
| 22 | #include "sun6i_csi_bridge.h" |
| 23 | #include "sun6i_csi_capture.h" |
| 24 | #include "sun6i_csi_reg.h" |
| 25 | |
| 26 | /* ISP */ |
| 27 | |
| 28 | int sun6i_csi_isp_complete(struct sun6i_csi_device *csi_dev, |
| 29 | struct v4l2_device *v4l2_dev) |
| 30 | { |
| 31 | if (csi_dev->v4l2_dev && csi_dev->v4l2_dev != v4l2_dev) |
| 32 | return -EINVAL; |
| 33 | |
| 34 | csi_dev->v4l2_dev = v4l2_dev; |
| 35 | csi_dev->media_dev = v4l2_dev->mdev; |
| 36 | |
| 37 | return sun6i_csi_capture_setup(csi_dev); |
| 38 | } |
| 39 | |
| 40 | static int sun6i_csi_isp_detect(struct sun6i_csi_device *csi_dev) |
| 41 | { |
| 42 | struct device *dev = csi_dev->dev; |
| 43 | struct fwnode_handle *handle; |
| 44 | |
| 45 | /* |
| 46 | * ISP is not available if not connected via fwnode graph. |
| 47 | * This will also check that the remote parent node is available. |
| 48 | */ |
| 49 | handle = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), |
| 50 | port: SUN6I_CSI_PORT_ISP, endpoint: 0, |
| 51 | FWNODE_GRAPH_ENDPOINT_NEXT); |
| 52 | if (!handle) |
| 53 | return 0; |
| 54 | |
| 55 | fwnode_handle_put(fwnode: handle); |
| 56 | |
| 57 | if (!IS_ENABLED(CONFIG_VIDEO_SUN6I_ISP)) { |
| 58 | dev_warn(dev, |
| 59 | "ISP link is detected but not enabled in kernel config!" ); |
| 60 | return 0; |
| 61 | } |
| 62 | |
| 63 | csi_dev->isp_available = true; |
| 64 | |
| 65 | return 0; |
| 66 | } |
| 67 | |
| 68 | /* Media */ |
| 69 | |
| 70 | static const struct media_device_ops sun6i_csi_media_ops = { |
| 71 | .link_notify = v4l2_pipeline_link_notify, |
| 72 | }; |
| 73 | |
| 74 | /* V4L2 */ |
| 75 | |
| 76 | static int sun6i_csi_v4l2_setup(struct sun6i_csi_device *csi_dev) |
| 77 | { |
| 78 | struct sun6i_csi_v4l2 *v4l2 = &csi_dev->v4l2; |
| 79 | struct media_device *media_dev = &v4l2->media_dev; |
| 80 | struct v4l2_device *v4l2_dev = &v4l2->v4l2_dev; |
| 81 | struct device *dev = csi_dev->dev; |
| 82 | int ret; |
| 83 | |
| 84 | /* Media Device */ |
| 85 | |
| 86 | strscpy(media_dev->model, SUN6I_CSI_DESCRIPTION, |
| 87 | sizeof(media_dev->model)); |
| 88 | media_dev->hw_revision = 0; |
| 89 | media_dev->ops = &sun6i_csi_media_ops; |
| 90 | media_dev->dev = dev; |
| 91 | |
| 92 | media_device_init(mdev: media_dev); |
| 93 | |
| 94 | ret = media_device_register(media_dev); |
| 95 | if (ret) { |
| 96 | dev_err(dev, "failed to register media device: %d\n" , ret); |
| 97 | goto error_media; |
| 98 | } |
| 99 | |
| 100 | /* V4L2 Device */ |
| 101 | |
| 102 | v4l2_dev->mdev = media_dev; |
| 103 | |
| 104 | ret = v4l2_device_register(dev, v4l2_dev); |
| 105 | if (ret) { |
| 106 | dev_err(dev, "failed to register v4l2 device: %d\n" , ret); |
| 107 | goto error_media; |
| 108 | } |
| 109 | |
| 110 | csi_dev->v4l2_dev = v4l2_dev; |
| 111 | csi_dev->media_dev = media_dev; |
| 112 | |
| 113 | return 0; |
| 114 | |
| 115 | error_media: |
| 116 | media_device_unregister(mdev: media_dev); |
| 117 | media_device_cleanup(mdev: media_dev); |
| 118 | |
| 119 | return ret; |
| 120 | } |
| 121 | |
| 122 | static void sun6i_csi_v4l2_cleanup(struct sun6i_csi_device *csi_dev) |
| 123 | { |
| 124 | struct sun6i_csi_v4l2 *v4l2 = &csi_dev->v4l2; |
| 125 | |
| 126 | media_device_unregister(mdev: &v4l2->media_dev); |
| 127 | v4l2_device_unregister(v4l2_dev: &v4l2->v4l2_dev); |
| 128 | media_device_cleanup(mdev: &v4l2->media_dev); |
| 129 | } |
| 130 | |
| 131 | /* Platform */ |
| 132 | |
| 133 | static irqreturn_t sun6i_csi_interrupt(int irq, void *private) |
| 134 | { |
| 135 | struct sun6i_csi_device *csi_dev = private; |
| 136 | bool capture_streaming = csi_dev->capture.state.streaming; |
| 137 | struct regmap *regmap = csi_dev->regmap; |
| 138 | u32 status = 0, enable = 0; |
| 139 | |
| 140 | regmap_read(map: regmap, SUN6I_CSI_CH_INT_STA_REG, val: &status); |
| 141 | regmap_read(map: regmap, SUN6I_CSI_CH_INT_EN_REG, val: &enable); |
| 142 | |
| 143 | if (!status) |
| 144 | return IRQ_NONE; |
| 145 | else if (!(status & enable) || !capture_streaming) |
| 146 | goto complete; |
| 147 | |
| 148 | if ((status & SUN6I_CSI_CH_INT_STA_FIFO0_OF) || |
| 149 | (status & SUN6I_CSI_CH_INT_STA_FIFO1_OF) || |
| 150 | (status & SUN6I_CSI_CH_INT_STA_FIFO2_OF) || |
| 151 | (status & SUN6I_CSI_CH_INT_STA_HB_OF)) { |
| 152 | regmap_write(map: regmap, SUN6I_CSI_CH_INT_STA_REG, val: status); |
| 153 | |
| 154 | regmap_update_bits(map: regmap, SUN6I_CSI_EN_REG, |
| 155 | SUN6I_CSI_EN_CSI_EN, val: 0); |
| 156 | regmap_update_bits(map: regmap, SUN6I_CSI_EN_REG, |
| 157 | SUN6I_CSI_EN_CSI_EN, SUN6I_CSI_EN_CSI_EN); |
| 158 | return IRQ_HANDLED; |
| 159 | } |
| 160 | |
| 161 | if (status & SUN6I_CSI_CH_INT_STA_FD) |
| 162 | sun6i_csi_capture_frame_done(csi_dev); |
| 163 | |
| 164 | if (status & SUN6I_CSI_CH_INT_STA_VS) |
| 165 | sun6i_csi_capture_sync(csi_dev); |
| 166 | |
| 167 | complete: |
| 168 | regmap_write(map: regmap, SUN6I_CSI_CH_INT_STA_REG, val: status); |
| 169 | |
| 170 | return IRQ_HANDLED; |
| 171 | } |
| 172 | |
| 173 | static int sun6i_csi_suspend(struct device *dev) |
| 174 | { |
| 175 | struct sun6i_csi_device *csi_dev = dev_get_drvdata(dev); |
| 176 | |
| 177 | reset_control_assert(rstc: csi_dev->reset); |
| 178 | clk_disable_unprepare(clk: csi_dev->clock_ram); |
| 179 | clk_disable_unprepare(clk: csi_dev->clock_mod); |
| 180 | |
| 181 | return 0; |
| 182 | } |
| 183 | |
| 184 | static int sun6i_csi_resume(struct device *dev) |
| 185 | { |
| 186 | struct sun6i_csi_device *csi_dev = dev_get_drvdata(dev); |
| 187 | int ret; |
| 188 | |
| 189 | ret = reset_control_deassert(rstc: csi_dev->reset); |
| 190 | if (ret) { |
| 191 | dev_err(dev, "failed to deassert reset\n" ); |
| 192 | return ret; |
| 193 | } |
| 194 | |
| 195 | ret = clk_prepare_enable(clk: csi_dev->clock_mod); |
| 196 | if (ret) { |
| 197 | dev_err(dev, "failed to enable module clock\n" ); |
| 198 | goto error_reset; |
| 199 | } |
| 200 | |
| 201 | ret = clk_prepare_enable(clk: csi_dev->clock_ram); |
| 202 | if (ret) { |
| 203 | dev_err(dev, "failed to enable ram clock\n" ); |
| 204 | goto error_clock_mod; |
| 205 | } |
| 206 | |
| 207 | return 0; |
| 208 | |
| 209 | error_clock_mod: |
| 210 | clk_disable_unprepare(clk: csi_dev->clock_mod); |
| 211 | |
| 212 | error_reset: |
| 213 | reset_control_assert(rstc: csi_dev->reset); |
| 214 | |
| 215 | return ret; |
| 216 | } |
| 217 | |
| 218 | static const struct dev_pm_ops sun6i_csi_pm_ops = { |
| 219 | .runtime_suspend = sun6i_csi_suspend, |
| 220 | .runtime_resume = sun6i_csi_resume, |
| 221 | }; |
| 222 | |
| 223 | static const struct regmap_config sun6i_csi_regmap_config = { |
| 224 | .reg_bits = 32, |
| 225 | .reg_stride = 4, |
| 226 | .val_bits = 32, |
| 227 | .max_register = 0x9c, |
| 228 | }; |
| 229 | |
| 230 | static int sun6i_csi_resources_setup(struct sun6i_csi_device *csi_dev, |
| 231 | struct platform_device *platform_dev) |
| 232 | { |
| 233 | struct device *dev = csi_dev->dev; |
| 234 | const struct sun6i_csi_variant *variant; |
| 235 | void __iomem *io_base; |
| 236 | int ret; |
| 237 | int irq; |
| 238 | |
| 239 | variant = of_device_get_match_data(dev); |
| 240 | if (!variant) |
| 241 | return -EINVAL; |
| 242 | |
| 243 | /* Registers */ |
| 244 | |
| 245 | io_base = devm_platform_ioremap_resource(pdev: platform_dev, index: 0); |
| 246 | if (IS_ERR(ptr: io_base)) |
| 247 | return PTR_ERR(ptr: io_base); |
| 248 | |
| 249 | csi_dev->regmap = devm_regmap_init_mmio_clk(dev, "bus" , io_base, |
| 250 | &sun6i_csi_regmap_config); |
| 251 | if (IS_ERR(ptr: csi_dev->regmap)) { |
| 252 | dev_err(dev, "failed to init register map\n" ); |
| 253 | return PTR_ERR(ptr: csi_dev->regmap); |
| 254 | } |
| 255 | |
| 256 | /* Clocks */ |
| 257 | |
| 258 | csi_dev->clock_mod = devm_clk_get(dev, id: "mod" ); |
| 259 | if (IS_ERR(ptr: csi_dev->clock_mod)) { |
| 260 | dev_err(dev, "failed to acquire module clock\n" ); |
| 261 | return PTR_ERR(ptr: csi_dev->clock_mod); |
| 262 | } |
| 263 | |
| 264 | csi_dev->clock_ram = devm_clk_get(dev, id: "ram" ); |
| 265 | if (IS_ERR(ptr: csi_dev->clock_ram)) { |
| 266 | dev_err(dev, "failed to acquire ram clock\n" ); |
| 267 | return PTR_ERR(ptr: csi_dev->clock_ram); |
| 268 | } |
| 269 | |
| 270 | ret = clk_set_rate_exclusive(clk: csi_dev->clock_mod, |
| 271 | rate: variant->clock_mod_rate); |
| 272 | if (ret) { |
| 273 | dev_err(dev, "failed to set mod clock rate\n" ); |
| 274 | return ret; |
| 275 | } |
| 276 | |
| 277 | /* Reset */ |
| 278 | |
| 279 | csi_dev->reset = devm_reset_control_get_shared(dev, NULL); |
| 280 | if (IS_ERR(ptr: csi_dev->reset)) { |
| 281 | dev_err(dev, "failed to acquire reset\n" ); |
| 282 | ret = PTR_ERR(ptr: csi_dev->reset); |
| 283 | goto error_clock_rate_exclusive; |
| 284 | } |
| 285 | |
| 286 | /* Interrupt */ |
| 287 | |
| 288 | irq = platform_get_irq(platform_dev, 0); |
| 289 | if (irq < 0) { |
| 290 | ret = -ENXIO; |
| 291 | goto error_clock_rate_exclusive; |
| 292 | } |
| 293 | |
| 294 | ret = devm_request_irq(dev, irq, handler: sun6i_csi_interrupt, IRQF_SHARED, |
| 295 | SUN6I_CSI_NAME, dev_id: csi_dev); |
| 296 | if (ret) { |
| 297 | dev_err(dev, "failed to request interrupt\n" ); |
| 298 | goto error_clock_rate_exclusive; |
| 299 | } |
| 300 | |
| 301 | /* Runtime PM */ |
| 302 | |
| 303 | pm_runtime_enable(dev); |
| 304 | |
| 305 | return 0; |
| 306 | |
| 307 | error_clock_rate_exclusive: |
| 308 | clk_rate_exclusive_put(clk: csi_dev->clock_mod); |
| 309 | |
| 310 | return ret; |
| 311 | } |
| 312 | |
| 313 | static void sun6i_csi_resources_cleanup(struct sun6i_csi_device *csi_dev) |
| 314 | { |
| 315 | pm_runtime_disable(dev: csi_dev->dev); |
| 316 | clk_rate_exclusive_put(clk: csi_dev->clock_mod); |
| 317 | } |
| 318 | |
| 319 | static int sun6i_csi_probe(struct platform_device *platform_dev) |
| 320 | { |
| 321 | struct sun6i_csi_device *csi_dev; |
| 322 | struct device *dev = &platform_dev->dev; |
| 323 | int ret; |
| 324 | |
| 325 | csi_dev = devm_kzalloc(dev, size: sizeof(*csi_dev), GFP_KERNEL); |
| 326 | if (!csi_dev) |
| 327 | return -ENOMEM; |
| 328 | |
| 329 | csi_dev->dev = &platform_dev->dev; |
| 330 | platform_set_drvdata(pdev: platform_dev, data: csi_dev); |
| 331 | |
| 332 | ret = sun6i_csi_resources_setup(csi_dev, platform_dev); |
| 333 | if (ret) |
| 334 | return ret; |
| 335 | |
| 336 | ret = sun6i_csi_isp_detect(csi_dev); |
| 337 | if (ret) |
| 338 | goto error_resources; |
| 339 | |
| 340 | /* |
| 341 | * Register our own v4l2 and media devices when there is no ISP around. |
| 342 | * Otherwise the ISP will use async subdev registration with our bridge, |
| 343 | * which will provide v4l2 and media devices that are used to register |
| 344 | * the video interface. |
| 345 | */ |
| 346 | if (!csi_dev->isp_available) { |
| 347 | ret = sun6i_csi_v4l2_setup(csi_dev); |
| 348 | if (ret) |
| 349 | goto error_resources; |
| 350 | } |
| 351 | |
| 352 | ret = sun6i_csi_bridge_setup(csi_dev); |
| 353 | if (ret) |
| 354 | goto error_v4l2; |
| 355 | |
| 356 | if (!csi_dev->isp_available) { |
| 357 | ret = sun6i_csi_capture_setup(csi_dev); |
| 358 | if (ret) |
| 359 | goto error_bridge; |
| 360 | } |
| 361 | |
| 362 | return 0; |
| 363 | |
| 364 | error_bridge: |
| 365 | sun6i_csi_bridge_cleanup(csi_dev); |
| 366 | |
| 367 | error_v4l2: |
| 368 | if (!csi_dev->isp_available) |
| 369 | sun6i_csi_v4l2_cleanup(csi_dev); |
| 370 | |
| 371 | error_resources: |
| 372 | sun6i_csi_resources_cleanup(csi_dev); |
| 373 | |
| 374 | return ret; |
| 375 | } |
| 376 | |
| 377 | static void sun6i_csi_remove(struct platform_device *pdev) |
| 378 | { |
| 379 | struct sun6i_csi_device *csi_dev = platform_get_drvdata(pdev); |
| 380 | |
| 381 | sun6i_csi_capture_cleanup(csi_dev); |
| 382 | sun6i_csi_bridge_cleanup(csi_dev); |
| 383 | |
| 384 | if (!csi_dev->isp_available) |
| 385 | sun6i_csi_v4l2_cleanup(csi_dev); |
| 386 | |
| 387 | sun6i_csi_resources_cleanup(csi_dev); |
| 388 | } |
| 389 | |
| 390 | static const struct sun6i_csi_variant sun6i_a31_csi_variant = { |
| 391 | .clock_mod_rate = 297000000, |
| 392 | }; |
| 393 | |
| 394 | static const struct sun6i_csi_variant sun50i_a64_csi_variant = { |
| 395 | .clock_mod_rate = 300000000, |
| 396 | }; |
| 397 | |
| 398 | static const struct of_device_id sun6i_csi_of_match[] = { |
| 399 | { |
| 400 | .compatible = "allwinner,sun6i-a31-csi" , |
| 401 | .data = &sun6i_a31_csi_variant, |
| 402 | }, |
| 403 | { |
| 404 | .compatible = "allwinner,sun8i-a83t-csi" , |
| 405 | .data = &sun6i_a31_csi_variant, |
| 406 | }, |
| 407 | { |
| 408 | .compatible = "allwinner,sun8i-h3-csi" , |
| 409 | .data = &sun6i_a31_csi_variant, |
| 410 | }, |
| 411 | { |
| 412 | .compatible = "allwinner,sun8i-v3s-csi" , |
| 413 | .data = &sun6i_a31_csi_variant, |
| 414 | }, |
| 415 | { |
| 416 | .compatible = "allwinner,sun50i-a64-csi" , |
| 417 | .data = &sun50i_a64_csi_variant, |
| 418 | }, |
| 419 | {}, |
| 420 | }; |
| 421 | |
| 422 | MODULE_DEVICE_TABLE(of, sun6i_csi_of_match); |
| 423 | |
| 424 | static struct platform_driver sun6i_csi_platform_driver = { |
| 425 | .probe = sun6i_csi_probe, |
| 426 | .remove = sun6i_csi_remove, |
| 427 | .driver = { |
| 428 | .name = SUN6I_CSI_NAME, |
| 429 | .of_match_table = sun6i_csi_of_match, |
| 430 | .pm = &sun6i_csi_pm_ops, |
| 431 | }, |
| 432 | }; |
| 433 | |
| 434 | module_platform_driver(sun6i_csi_platform_driver); |
| 435 | |
| 436 | MODULE_DESCRIPTION("Allwinner A31 Camera Sensor Interface driver" ); |
| 437 | MODULE_AUTHOR("Yong Deng <yong.deng@magewell.com>" ); |
| 438 | MODULE_AUTHOR("Paul Kocialkowski <paul.kocialkowski@bootlin.com>" ); |
| 439 | MODULE_LICENSE("GPL" ); |
| 440 | |