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_find_property(np, "xlnx,vtc", NULL))
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 int 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 return 0;
356 }
357
358 static const struct of_device_id xvtc_of_id_table[] = {
359 { .compatible = "xlnx,v-tc-6.1" },
360 { }
361 };
362 MODULE_DEVICE_TABLE(of, xvtc_of_id_table);
363
364 static struct platform_driver xvtc_driver = {
365 .driver = {
366 .name = "xilinx-vtc",
367 .of_match_table = xvtc_of_id_table,
368 },
369 .probe = xvtc_probe,
370 .remove = xvtc_remove,
371 };
372
373 module_platform_driver(xvtc_driver);
374
375 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
376 MODULE_DESCRIPTION("Xilinx Video Timing Controller Driver");
377 MODULE_LICENSE("GPL v2");
378