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
sun6i_csi_isp_complete(struct sun6i_csi_device * csi_dev,struct v4l2_device * v4l2_dev)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
sun6i_csi_isp_detect(struct sun6i_csi_device * csi_dev)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 SUN6I_CSI_PORT_ISP, 0,
51 FWNODE_GRAPH_ENDPOINT_NEXT);
52 if (!handle)
53 return 0;
54
55 fwnode_handle_put(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
sun6i_csi_v4l2_setup(struct sun6i_csi_device * csi_dev)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(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(media_dev);
117 media_device_cleanup(media_dev);
118
119 return ret;
120 }
121
sun6i_csi_v4l2_cleanup(struct sun6i_csi_device * csi_dev)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(&v4l2->media_dev);
127 v4l2_device_unregister(&v4l2->v4l2_dev);
128 media_device_cleanup(&v4l2->media_dev);
129 }
130
131 /* Platform */
132
sun6i_csi_interrupt(int irq,void * private)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(regmap, SUN6I_CSI_CH_INT_STA_REG, &status);
141 regmap_read(regmap, SUN6I_CSI_CH_INT_EN_REG, &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(regmap, SUN6I_CSI_CH_INT_STA_REG, status);
153
154 regmap_update_bits(regmap, SUN6I_CSI_EN_REG,
155 SUN6I_CSI_EN_CSI_EN, 0);
156 regmap_update_bits(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(regmap, SUN6I_CSI_CH_INT_STA_REG, status);
169
170 return IRQ_HANDLED;
171 }
172
sun6i_csi_suspend(struct device * dev)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(csi_dev->reset);
178 clk_disable_unprepare(csi_dev->clock_ram);
179 clk_disable_unprepare(csi_dev->clock_mod);
180
181 return 0;
182 }
183
sun6i_csi_resume(struct device * dev)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(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(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(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(csi_dev->clock_mod);
211
212 error_reset:
213 reset_control_assert(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
sun6i_csi_resources_setup(struct sun6i_csi_device * csi_dev,struct platform_device * platform_dev)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(platform_dev, 0);
246 if (IS_ERR(io_base))
247 return PTR_ERR(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(csi_dev->regmap)) {
252 dev_err(dev, "failed to init register map\n");
253 return PTR_ERR(csi_dev->regmap);
254 }
255
256 /* Clocks */
257
258 csi_dev->clock_mod = devm_clk_get(dev, "mod");
259 if (IS_ERR(csi_dev->clock_mod)) {
260 dev_err(dev, "failed to acquire module clock\n");
261 return PTR_ERR(csi_dev->clock_mod);
262 }
263
264 csi_dev->clock_ram = devm_clk_get(dev, "ram");
265 if (IS_ERR(csi_dev->clock_ram)) {
266 dev_err(dev, "failed to acquire ram clock\n");
267 return PTR_ERR(csi_dev->clock_ram);
268 }
269
270 ret = clk_set_rate_exclusive(csi_dev->clock_mod,
271 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(csi_dev->reset)) {
281 dev_err(dev, "failed to acquire reset\n");
282 ret = PTR_ERR(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, sun6i_csi_interrupt, IRQF_SHARED,
295 SUN6I_CSI_NAME, 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(csi_dev->clock_mod);
309
310 return ret;
311 }
312
sun6i_csi_resources_cleanup(struct sun6i_csi_device * csi_dev)313 static void sun6i_csi_resources_cleanup(struct sun6i_csi_device *csi_dev)
314 {
315 pm_runtime_disable(csi_dev->dev);
316 clk_rate_exclusive_put(csi_dev->clock_mod);
317 }
318
sun6i_csi_probe(struct platform_device * platform_dev)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, sizeof(*csi_dev), GFP_KERNEL);
326 if (!csi_dev)
327 return -ENOMEM;
328
329 csi_dev->dev = &platform_dev->dev;
330 platform_set_drvdata(platform_dev, 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
sun6i_csi_remove(struct platform_device * pdev)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_new = 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