1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Xilinx Video Timing Controller
4  *
5  * Copyright (C) 2013-2015 Ideas on Board
6  * Copyright (C) 2013-2015 Xilinx, Inc.
7  *
8  * Contacts: Hyun Kwon <hyun.kwon@xilinx.com>
9  *           Laurent Pinchart <laurent.pinchart@ideasonboard.com>
10  */
11 
12 #include <linux/clk.h>
13 #include <linux/module.h>
14 #include <linux/of.h>
15 #include <linux/platform_device.h>
16 #include <linux/slab.h>
17 
18 #include "xilinx-vip.h"
19 #include "xilinx-vtc.h"
20 
21 #define XVTC_CONTROL_FIELD_ID_POL_SRC		(1 << 26)
22 #define XVTC_CONTROL_ACTIVE_CHROMA_POL_SRC	(1 << 25)
23 #define XVTC_CONTROL_ACTIVE_VIDEO_POL_SRC	(1 << 24)
24 #define XVTC_CONTROL_HSYNC_POL_SRC		(1 << 23)
25 #define XVTC_CONTROL_VSYNC_POL_SRC		(1 << 22)
26 #define XVTC_CONTROL_HBLANK_POL_SRC		(1 << 21)
27 #define XVTC_CONTROL_VBLANK_POL_SRC		(1 << 20)
28 #define XVTC_CONTROL_CHROMA_SRC			(1 << 18)
29 #define XVTC_CONTROL_VBLANK_HOFF_SRC		(1 << 17)
30 #define XVTC_CONTROL_VSYNC_END_SRC		(1 << 16)
31 #define XVTC_CONTROL_VSYNC_START_SRC		(1 << 15)
32 #define XVTC_CONTROL_ACTIVE_VSIZE_SRC		(1 << 14)
33 #define XVTC_CONTROL_FRAME_VSIZE_SRC		(1 << 13)
34 #define XVTC_CONTROL_HSYNC_END_SRC		(1 << 11)
35 #define XVTC_CONTROL_HSYNC_START_SRC		(1 << 10)
36 #define XVTC_CONTROL_ACTIVE_HSIZE_SRC		(1 << 9)
37 #define XVTC_CONTROL_FRAME_HSIZE_SRC		(1 << 8)
38 #define XVTC_CONTROL_SYNC_ENABLE		(1 << 5)
39 #define XVTC_CONTROL_DET_ENABLE			(1 << 3)
40 #define XVTC_CONTROL_GEN_ENABLE			(1 << 2)
41 
42 #define XVTC_STATUS_FSYNC(n)			((n) << 16)
43 #define XVTC_STATUS_GEN_ACTIVE_VIDEO		(1 << 13)
44 #define XVTC_STATUS_GEN_VBLANK			(1 << 12)
45 #define XVTC_STATUS_DET_ACTIVE_VIDEO		(1 << 11)
46 #define XVTC_STATUS_DET_VBLANK			(1 << 10)
47 #define XVTC_STATUS_LOCK_LOSS			(1 << 9)
48 #define XVTC_STATUS_LOCK			(1 << 8)
49 
50 #define XVTC_ERROR_ACTIVE_CHROMA_LOCK		(1 << 21)
51 #define XVTC_ERROR_ACTIVE_VIDEO_LOCK		(1 << 20)
52 #define XVTC_ERROR_HSYNC_LOCK			(1 << 19)
53 #define XVTC_ERROR_VSYNC_LOCK			(1 << 18)
54 #define XVTC_ERROR_HBLANK_LOCK			(1 << 17)
55 #define XVTC_ERROR_VBLANK_LOCK			(1 << 16)
56 
57 #define XVTC_IRQ_ENABLE_FSYNC(n)		((n) << 16)
58 #define XVTC_IRQ_ENABLE_GEN_ACTIVE_VIDEO	(1 << 13)
59 #define XVTC_IRQ_ENABLE_GEN_VBLANK		(1 << 12)
60 #define XVTC_IRQ_ENABLE_DET_ACTIVE_VIDEO	(1 << 11)
61 #define XVTC_IRQ_ENABLE_DET_VBLANK		(1 << 10)
62 #define XVTC_IRQ_ENABLE_LOCK_LOSS		(1 << 9)
63 #define XVTC_IRQ_ENABLE_LOCK			(1 << 8)
64 
65 /*
66  * The following registers exist in two blocks, one at 0x0020 for the detector
67  * and one at 0x0060 for the generator.
68  */
69 
70 #define XVTC_DETECTOR_OFFSET			0x0020
71 #define XVTC_GENERATOR_OFFSET			0x0060
72 
73 #define XVTC_ACTIVE_SIZE			0x0000
74 #define XVTC_ACTIVE_VSIZE_SHIFT			16
75 #define XVTC_ACTIVE_VSIZE_MASK			(0x1fff << 16)
76 #define XVTC_ACTIVE_HSIZE_SHIFT			0
77 #define XVTC_ACTIVE_HSIZE_MASK			(0x1fff << 0)
78 
79 #define XVTC_TIMING_STATUS			0x0004
80 #define XVTC_TIMING_STATUS_ACTIVE_VIDEO		(1 << 2)
81 #define XVTC_TIMING_STATUS_VBLANK		(1 << 1)
82 #define XVTC_TIMING_STATUS_LOCKED		(1 << 0)
83 
84 #define XVTC_ENCODING				0x0008
85 #define XVTC_ENCODING_CHROMA_PARITY_SHIFT	8
86 #define XVTC_ENCODING_CHROMA_PARITY_MASK	(3 << 8)
87 #define XVTC_ENCODING_CHROMA_PARITY_EVEN_ALL	(0 << 8)
88 #define XVTC_ENCODING_CHROMA_PARITY_ODD_ALL	(1 << 8)
89 #define XVTC_ENCODING_CHROMA_PARITY_EVEN_EVEN	(2 << 8)
90 #define XVTC_ENCODING_CHROMA_PARITY_ODD_EVEN	(3 << 8)
91 #define XVTC_ENCODING_VIDEO_FORMAT_SHIFT	0
92 #define XVTC_ENCODING_VIDEO_FORMAT_MASK		(0xf << 0)
93 #define XVTC_ENCODING_VIDEO_FORMAT_YUV422	(0 << 0)
94 #define XVTC_ENCODING_VIDEO_FORMAT_YUV444	(1 << 0)
95 #define XVTC_ENCODING_VIDEO_FORMAT_RGB		(2 << 0)
96 #define XVTC_ENCODING_VIDEO_FORMAT_YUV420	(3 << 0)
97 
98 #define XVTC_POLARITY				0x000c
99 #define XVTC_POLARITY_ACTIVE_CHROMA_POL		(1 << 5)
100 #define XVTC_POLARITY_ACTIVE_VIDEO_POL		(1 << 4)
101 #define XVTC_POLARITY_HSYNC_POL			(1 << 3)
102 #define XVTC_POLARITY_VSYNC_POL			(1 << 2)
103 #define XVTC_POLARITY_HBLANK_POL		(1 << 1)
104 #define XVTC_POLARITY_VBLANK_POL		(1 << 0)
105 
106 #define XVTC_HSIZE				0x0010
107 #define XVTC_HSIZE_MASK				(0x1fff << 0)
108 
109 #define XVTC_VSIZE				0x0014
110 #define XVTC_VSIZE_MASK				(0x1fff << 0)
111 
112 #define XVTC_HSYNC				0x0018
113 #define XVTC_HSYNC_END_SHIFT			16
114 #define XVTC_HSYNC_END_MASK			(0x1fff << 16)
115 #define XVTC_HSYNC_START_SHIFT			0
116 #define XVTC_HSYNC_START_MASK			(0x1fff << 0)
117 
118 #define XVTC_F0_VBLANK_H			0x001c
119 #define XVTC_F0_VBLANK_HEND_SHIFT		16
120 #define XVTC_F0_VBLANK_HEND_MASK		(0x1fff << 16)
121 #define XVTC_F0_VBLANK_HSTART_SHIFT		0
122 #define XVTC_F0_VBLANK_HSTART_MASK		(0x1fff << 0)
123 
124 #define XVTC_F0_VSYNC_V				0x0020
125 #define XVTC_F0_VSYNC_VEND_SHIFT		16
126 #define XVTC_F0_VSYNC_VEND_MASK			(0x1fff << 16)
127 #define XVTC_F0_VSYNC_VSTART_SHIFT		0
128 #define XVTC_F0_VSYNC_VSTART_MASK		(0x1fff << 0)
129 
130 #define XVTC_F0_VSYNC_H				0x0024
131 #define XVTC_F0_VSYNC_HEND_SHIFT		16
132 #define XVTC_F0_VSYNC_HEND_MASK			(0x1fff << 16)
133 #define XVTC_F0_VSYNC_HSTART_SHIFT		0
134 #define XVTC_F0_VSYNC_HSTART_MASK		(0x1fff << 0)
135 
136 #define XVTC_FRAME_SYNC_CONFIG(n)		(0x0100 + 4 * (n))
137 #define XVTC_FRAME_SYNC_V_START_SHIFT		16
138 #define XVTC_FRAME_SYNC_V_START_MASK		(0x1fff << 16)
139 #define XVTC_FRAME_SYNC_H_START_SHIFT		0
140 #define XVTC_FRAME_SYNC_H_START_MASK		(0x1fff << 0)
141 
142 #define XVTC_GENERATOR_GLOBAL_DELAY		0x0104
143 
144 /**
145  * struct xvtc_device - Xilinx Video Timing Controller device structure
146  * @xvip: Xilinx Video IP device
147  * @list: entry in the global VTC list
148  * @has_detector: the VTC has a timing detector
149  * @has_generator: the VTC has a timing generator
150  * @config: generator timings configuration
151  */
152 struct xvtc_device {
153 	struct xvip_device xvip;
154 	struct list_head list;
155 
156 	bool has_detector;
157 	bool has_generator;
158 
159 	struct xvtc_config config;
160 };
161 
162 static LIST_HEAD(xvtc_list);
163 static DEFINE_MUTEX(xvtc_lock);
164 
xvtc_gen_write(struct xvtc_device * xvtc,u32 addr,u32 value)165 static inline void xvtc_gen_write(struct xvtc_device *xvtc, u32 addr, u32 value)
166 {
167 	xvip_write(&xvtc->xvip, XVTC_GENERATOR_OFFSET + addr, value);
168 }
169 
170 /* -----------------------------------------------------------------------------
171  * Generator Operations
172  */
173 
xvtc_generator_start(struct xvtc_device * xvtc,const struct xvtc_config * config)174 int xvtc_generator_start(struct xvtc_device *xvtc,
175 			 const struct xvtc_config *config)
176 {
177 	int ret;
178 
179 	if (!xvtc->has_generator)
180 		return -ENXIO;
181 
182 	ret = clk_prepare_enable(xvtc->xvip.clk);
183 	if (ret < 0)
184 		return ret;
185 
186 	/* We don't care about the chroma active signal, encoding parameters are
187 	 * not important for now.
188 	 */
189 	xvtc_gen_write(xvtc, XVTC_POLARITY,
190 		       XVTC_POLARITY_ACTIVE_CHROMA_POL |
191 		       XVTC_POLARITY_ACTIVE_VIDEO_POL |
192 		       XVTC_POLARITY_HSYNC_POL | XVTC_POLARITY_VSYNC_POL |
193 		       XVTC_POLARITY_HBLANK_POL | XVTC_POLARITY_VBLANK_POL);
194 
195 	/* Hardcode the polarity to active high, as required by the video in to
196 	 * AXI4-stream core.
197 	 */
198 	xvtc_gen_write(xvtc, XVTC_ENCODING, 0);
199 
200 	/* Configure the timings. The VBLANK and VSYNC signals assertion and
201 	 * deassertion are hardcoded to the first pixel of the line.
202 	 */
203 	xvtc_gen_write(xvtc, XVTC_ACTIVE_SIZE,
204 		       (config->vblank_start << XVTC_ACTIVE_VSIZE_SHIFT) |
205 		       (config->hblank_start << XVTC_ACTIVE_HSIZE_SHIFT));
206 	xvtc_gen_write(xvtc, XVTC_HSIZE, config->hsize);
207 	xvtc_gen_write(xvtc, XVTC_VSIZE, config->vsize);
208 	xvtc_gen_write(xvtc, XVTC_HSYNC,
209 		       (config->hsync_end << XVTC_HSYNC_END_SHIFT) |
210 		       (config->hsync_start << XVTC_HSYNC_START_SHIFT));
211 	xvtc_gen_write(xvtc, XVTC_F0_VBLANK_H, 0);
212 	xvtc_gen_write(xvtc, XVTC_F0_VSYNC_V,
213 		       (config->vsync_end << XVTC_F0_VSYNC_VEND_SHIFT) |
214 		       (config->vsync_start << XVTC_F0_VSYNC_VSTART_SHIFT));
215 	xvtc_gen_write(xvtc, XVTC_F0_VSYNC_H, 0);
216 
217 	/* Enable the generator. Set the source of all generator parameters to
218 	 * generator registers.
219 	 */
220 	xvip_write(&xvtc->xvip, XVIP_CTRL_CONTROL,
221 		   XVTC_CONTROL_ACTIVE_CHROMA_POL_SRC |
222 		   XVTC_CONTROL_ACTIVE_VIDEO_POL_SRC |
223 		   XVTC_CONTROL_HSYNC_POL_SRC | XVTC_CONTROL_VSYNC_POL_SRC |
224 		   XVTC_CONTROL_HBLANK_POL_SRC | XVTC_CONTROL_VBLANK_POL_SRC |
225 		   XVTC_CONTROL_CHROMA_SRC | XVTC_CONTROL_VBLANK_HOFF_SRC |
226 		   XVTC_CONTROL_VSYNC_END_SRC | XVTC_CONTROL_VSYNC_START_SRC |
227 		   XVTC_CONTROL_ACTIVE_VSIZE_SRC |
228 		   XVTC_CONTROL_FRAME_VSIZE_SRC | XVTC_CONTROL_HSYNC_END_SRC |
229 		   XVTC_CONTROL_HSYNC_START_SRC |
230 		   XVTC_CONTROL_ACTIVE_HSIZE_SRC |
231 		   XVTC_CONTROL_FRAME_HSIZE_SRC | XVTC_CONTROL_GEN_ENABLE |
232 		   XVIP_CTRL_CONTROL_REG_UPDATE);
233 
234 	return 0;
235 }
236 EXPORT_SYMBOL_GPL(xvtc_generator_start);
237 
xvtc_generator_stop(struct xvtc_device * xvtc)238 int xvtc_generator_stop(struct xvtc_device *xvtc)
239 {
240 	if (!xvtc->has_generator)
241 		return -ENXIO;
242 
243 	xvip_write(&xvtc->xvip, XVIP_CTRL_CONTROL, 0);
244 
245 	clk_disable_unprepare(xvtc->xvip.clk);
246 
247 	return 0;
248 }
249 EXPORT_SYMBOL_GPL(xvtc_generator_stop);
250 
xvtc_of_get(struct device_node * np)251 struct xvtc_device *xvtc_of_get(struct device_node *np)
252 {
253 	struct device_node *xvtc_node;
254 	struct xvtc_device *found = NULL;
255 	struct xvtc_device *xvtc;
256 
257 	if (!of_property_present(np, "xlnx,vtc"))
258 		return NULL;
259 
260 	xvtc_node = of_parse_phandle(np, "xlnx,vtc", 0);
261 	if (xvtc_node == NULL)
262 		return ERR_PTR(-EINVAL);
263 
264 	mutex_lock(&xvtc_lock);
265 	list_for_each_entry(xvtc, &xvtc_list, list) {
266 		if (xvtc->xvip.dev->of_node == xvtc_node) {
267 			found = xvtc;
268 			break;
269 		}
270 	}
271 	mutex_unlock(&xvtc_lock);
272 
273 	of_node_put(xvtc_node);
274 
275 	if (!found)
276 		return ERR_PTR(-EPROBE_DEFER);
277 
278 	return found;
279 }
280 EXPORT_SYMBOL_GPL(xvtc_of_get);
281 
xvtc_put(struct xvtc_device * xvtc)282 void xvtc_put(struct xvtc_device *xvtc)
283 {
284 }
285 EXPORT_SYMBOL_GPL(xvtc_put);
286 
287 /* -----------------------------------------------------------------------------
288  * Registration and Unregistration
289  */
290 
xvtc_register_device(struct xvtc_device * xvtc)291 static void xvtc_register_device(struct xvtc_device *xvtc)
292 {
293 	mutex_lock(&xvtc_lock);
294 	list_add_tail(&xvtc->list, &xvtc_list);
295 	mutex_unlock(&xvtc_lock);
296 }
297 
xvtc_unregister_device(struct xvtc_device * xvtc)298 static void xvtc_unregister_device(struct xvtc_device *xvtc)
299 {
300 	mutex_lock(&xvtc_lock);
301 	list_del(&xvtc->list);
302 	mutex_unlock(&xvtc_lock);
303 }
304 
305 /* -----------------------------------------------------------------------------
306  * Platform Device Driver
307  */
308 
xvtc_parse_of(struct xvtc_device * xvtc)309 static int xvtc_parse_of(struct xvtc_device *xvtc)
310 {
311 	struct device_node *node = xvtc->xvip.dev->of_node;
312 
313 	xvtc->has_detector = of_property_read_bool(node, "xlnx,detector");
314 	xvtc->has_generator = of_property_read_bool(node, "xlnx,generator");
315 
316 	return 0;
317 }
318 
xvtc_probe(struct platform_device * pdev)319 static int xvtc_probe(struct platform_device *pdev)
320 {
321 	struct xvtc_device *xvtc;
322 	int ret;
323 
324 	xvtc = devm_kzalloc(&pdev->dev, sizeof(*xvtc), GFP_KERNEL);
325 	if (!xvtc)
326 		return -ENOMEM;
327 
328 	xvtc->xvip.dev = &pdev->dev;
329 
330 	ret = xvtc_parse_of(xvtc);
331 	if (ret < 0)
332 		return ret;
333 
334 	ret = xvip_init_resources(&xvtc->xvip);
335 	if (ret < 0)
336 		return ret;
337 
338 	platform_set_drvdata(pdev, xvtc);
339 
340 	xvip_print_version(&xvtc->xvip);
341 
342 	xvtc_register_device(xvtc);
343 
344 	return 0;
345 }
346 
xvtc_remove(struct platform_device * pdev)347 static void xvtc_remove(struct platform_device *pdev)
348 {
349 	struct xvtc_device *xvtc = platform_get_drvdata(pdev);
350 
351 	xvtc_unregister_device(xvtc);
352 
353 	xvip_cleanup_resources(&xvtc->xvip);
354 }
355 
356 static const struct of_device_id xvtc_of_id_table[] = {
357 	{ .compatible = "xlnx,v-tc-6.1" },
358 	{ }
359 };
360 MODULE_DEVICE_TABLE(of, xvtc_of_id_table);
361 
362 static struct platform_driver xvtc_driver = {
363 	.driver = {
364 		.name = "xilinx-vtc",
365 		.of_match_table = xvtc_of_id_table,
366 	},
367 	.probe = xvtc_probe,
368 	.remove_new = xvtc_remove,
369 };
370 
371 module_platform_driver(xvtc_driver);
372 
373 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
374 MODULE_DESCRIPTION("Xilinx Video Timing Controller Driver");
375 MODULE_LICENSE("GPL v2");
376