1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (C) 2017 Free Electrons
4  * Maxime Ripard <maxime.ripard@free-electrons.com>
5  */
6 
7 #include <linux/clk.h>
8 #include <linux/component.h>
9 #include <linux/module.h>
10 #include <linux/of.h>
11 #include <linux/platform_device.h>
12 #include <linux/pm_runtime.h>
13 #include <linux/regmap.h>
14 #include <linux/reset.h>
15 
16 #include <drm/drm_device.h>
17 #include <drm/drm_fb_dma_helper.h>
18 #include <drm/drm_fourcc.h>
19 #include <drm/drm_framebuffer.h>
20 #include <drm/drm_gem_dma_helper.h>
21 #include <drm/drm_plane.h>
22 
23 #include "sun4i_drv.h"
24 #include "sun4i_frontend.h"
25 
26 static const u32 sun4i_frontend_vert_coef[32] = {
27 	0x00004000, 0x000140ff, 0x00033ffe, 0x00043ffd,
28 	0x00063efc, 0xff083dfc, 0x000a3bfb, 0xff0d39fb,
29 	0xff0f37fb, 0xff1136fa, 0xfe1433fb, 0xfe1631fb,
30 	0xfd192ffb, 0xfd1c2cfb, 0xfd1f29fb, 0xfc2127fc,
31 	0xfc2424fc, 0xfc2721fc, 0xfb291ffd, 0xfb2c1cfd,
32 	0xfb2f19fd, 0xfb3116fe, 0xfb3314fe, 0xfa3611ff,
33 	0xfb370fff, 0xfb390dff, 0xfb3b0a00, 0xfc3d08ff,
34 	0xfc3e0600, 0xfd3f0400, 0xfe3f0300, 0xff400100,
35 };
36 
37 static const u32 sun4i_frontend_horz_coef[64] = {
38 	0x40000000, 0x00000000, 0x40fe0000, 0x0000ff03,
39 	0x3ffd0000, 0x0000ff05, 0x3ffc0000, 0x0000ff06,
40 	0x3efb0000, 0x0000ff08, 0x3dfb0000, 0x0000ff09,
41 	0x3bfa0000, 0x0000fe0d, 0x39fa0000, 0x0000fe0f,
42 	0x38fa0000, 0x0000fe10, 0x36fa0000, 0x0000fe12,
43 	0x33fa0000, 0x0000fd16, 0x31fa0000, 0x0000fd18,
44 	0x2ffa0000, 0x0000fd1a, 0x2cfa0000, 0x0000fc1e,
45 	0x29fa0000, 0x0000fc21, 0x27fb0000, 0x0000fb23,
46 	0x24fb0000, 0x0000fb26, 0x21fb0000, 0x0000fb29,
47 	0x1ffc0000, 0x0000fa2b, 0x1cfc0000, 0x0000fa2e,
48 	0x19fd0000, 0x0000fa30, 0x16fd0000, 0x0000fa33,
49 	0x14fd0000, 0x0000fa35, 0x11fe0000, 0x0000fa37,
50 	0x0ffe0000, 0x0000fa39, 0x0dfe0000, 0x0000fa3b,
51 	0x0afe0000, 0x0000fa3e, 0x08ff0000, 0x0000fb3e,
52 	0x06ff0000, 0x0000fb40, 0x05ff0000, 0x0000fc40,
53 	0x03ff0000, 0x0000fd41, 0x01ff0000, 0x0000fe42,
54 };
55 
56 /*
57  * These coefficients are taken from the A33 BSP from Allwinner.
58  *
59  * The first three values of each row are coded as 13-bit signed fixed-point
60  * numbers, with 10 bits for the fractional part. The fourth value is a
61  * constant coded as a 14-bit signed fixed-point number with 4 bits for the
62  * fractional part.
63  *
64  * The values in table order give the following colorspace translation:
65  * G = 1.164 * Y - 0.391 * U - 0.813 * V + 135
66  * R = 1.164 * Y + 1.596 * V - 222
67  * B = 1.164 * Y + 2.018 * U + 276
68  *
69  * This seems to be a conversion from Y[16:235] UV[16:240] to RGB[0:255],
70  * following the BT601 spec.
71  */
72 const u32 sunxi_bt601_yuv2rgb_coef[12] = {
73 	0x000004a7, 0x00001e6f, 0x00001cbf, 0x00000877,
74 	0x000004a7, 0x00000000, 0x00000662, 0x00003211,
75 	0x000004a7, 0x00000812, 0x00000000, 0x00002eb1,
76 };
77 EXPORT_SYMBOL(sunxi_bt601_yuv2rgb_coef);
78 
79 static void sun4i_frontend_scaler_init(struct sun4i_frontend *frontend)
80 {
81 	int i;
82 
83 	if (frontend->data->has_coef_access_ctrl)
84 		regmap_write_bits(frontend->regs, SUN4I_FRONTEND_FRM_CTRL_REG,
85 				  SUN4I_FRONTEND_FRM_CTRL_COEF_ACCESS_CTRL,
86 				  SUN4I_FRONTEND_FRM_CTRL_COEF_ACCESS_CTRL);
87 
88 	for (i = 0; i < 32; i++) {
89 		regmap_write(frontend->regs, SUN4I_FRONTEND_CH0_HORZCOEF0_REG(i),
90 			     sun4i_frontend_horz_coef[2 * i]);
91 		regmap_write(frontend->regs, SUN4I_FRONTEND_CH1_HORZCOEF0_REG(i),
92 			     sun4i_frontend_horz_coef[2 * i]);
93 		regmap_write(frontend->regs, SUN4I_FRONTEND_CH0_HORZCOEF1_REG(i),
94 			     sun4i_frontend_horz_coef[2 * i + 1]);
95 		regmap_write(frontend->regs, SUN4I_FRONTEND_CH1_HORZCOEF1_REG(i),
96 			     sun4i_frontend_horz_coef[2 * i + 1]);
97 		regmap_write(frontend->regs, SUN4I_FRONTEND_CH0_VERTCOEF_REG(i),
98 			     sun4i_frontend_vert_coef[i]);
99 		regmap_write(frontend->regs, SUN4I_FRONTEND_CH1_VERTCOEF_REG(i),
100 			     sun4i_frontend_vert_coef[i]);
101 	}
102 
103 	if (frontend->data->has_coef_rdy)
104 		regmap_write_bits(frontend->regs,
105 				  SUN4I_FRONTEND_FRM_CTRL_REG,
106 				  SUN4I_FRONTEND_FRM_CTRL_COEF_RDY,
107 				  SUN4I_FRONTEND_FRM_CTRL_COEF_RDY);
108 }
109 
110 int sun4i_frontend_init(struct sun4i_frontend *frontend)
111 {
112 	return pm_runtime_get_sync(frontend->dev);
113 }
114 EXPORT_SYMBOL(sun4i_frontend_init);
115 
116 void sun4i_frontend_exit(struct sun4i_frontend *frontend)
117 {
118 	pm_runtime_put(frontend->dev);
119 }
120 EXPORT_SYMBOL(sun4i_frontend_exit);
121 
122 static bool sun4i_frontend_format_chroma_requires_swap(uint32_t fmt)
123 {
124 	switch (fmt) {
125 	case DRM_FORMAT_YVU411:
126 	case DRM_FORMAT_YVU420:
127 	case DRM_FORMAT_YVU422:
128 	case DRM_FORMAT_YVU444:
129 		return true;
130 
131 	default:
132 		return false;
133 	}
134 }
135 
136 static bool sun4i_frontend_format_supports_tiling(uint32_t fmt)
137 {
138 	switch (fmt) {
139 	case DRM_FORMAT_NV12:
140 	case DRM_FORMAT_NV16:
141 	case DRM_FORMAT_NV21:
142 	case DRM_FORMAT_NV61:
143 	case DRM_FORMAT_YUV411:
144 	case DRM_FORMAT_YUV420:
145 	case DRM_FORMAT_YUV422:
146 	case DRM_FORMAT_YVU420:
147 	case DRM_FORMAT_YVU422:
148 	case DRM_FORMAT_YVU411:
149 		return true;
150 
151 	default:
152 		return false;
153 	}
154 }
155 
156 void sun4i_frontend_update_buffer(struct sun4i_frontend *frontend,
157 				  struct drm_plane *plane)
158 {
159 	struct drm_plane_state *state = plane->state;
160 	struct drm_framebuffer *fb = state->fb;
161 	unsigned int strides[3] = {};
162 
163 	dma_addr_t dma_addr;
164 	bool swap;
165 
166 	if (fb->modifier == DRM_FORMAT_MOD_ALLWINNER_TILED) {
167 		unsigned int width = state->src_w >> 16;
168 		unsigned int offset;
169 
170 		strides[0] = SUN4I_FRONTEND_LINESTRD_TILED(fb->pitches[0]);
171 
172 		/*
173 		 * The X1 offset is the offset to the bottom-right point in the
174 		 * end tile, which is the final pixel (at offset width - 1)
175 		 * within the end tile (with a 32-byte mask).
176 		 */
177 		offset = (width - 1) & (32 - 1);
178 
179 		regmap_write(frontend->regs, SUN4I_FRONTEND_TB_OFF0_REG,
180 			     SUN4I_FRONTEND_TB_OFF_X1(offset));
181 
182 		if (fb->format->num_planes > 1) {
183 			strides[1] =
184 				SUN4I_FRONTEND_LINESTRD_TILED(fb->pitches[1]);
185 
186 			regmap_write(frontend->regs, SUN4I_FRONTEND_TB_OFF1_REG,
187 				     SUN4I_FRONTEND_TB_OFF_X1(offset));
188 		}
189 
190 		if (fb->format->num_planes > 2) {
191 			strides[2] =
192 				SUN4I_FRONTEND_LINESTRD_TILED(fb->pitches[2]);
193 
194 			regmap_write(frontend->regs, SUN4I_FRONTEND_TB_OFF2_REG,
195 				     SUN4I_FRONTEND_TB_OFF_X1(offset));
196 		}
197 	} else {
198 		strides[0] = fb->pitches[0];
199 
200 		if (fb->format->num_planes > 1)
201 			strides[1] = fb->pitches[1];
202 
203 		if (fb->format->num_planes > 2)
204 			strides[2] = fb->pitches[2];
205 	}
206 
207 	/* Set the line width */
208 	DRM_DEBUG_DRIVER("Frontend stride: %d bytes\n", fb->pitches[0]);
209 	regmap_write(frontend->regs, SUN4I_FRONTEND_LINESTRD0_REG,
210 		     strides[0]);
211 
212 	if (fb->format->num_planes > 1)
213 		regmap_write(frontend->regs, SUN4I_FRONTEND_LINESTRD1_REG,
214 			     strides[1]);
215 
216 	if (fb->format->num_planes > 2)
217 		regmap_write(frontend->regs, SUN4I_FRONTEND_LINESTRD2_REG,
218 			     strides[2]);
219 
220 	/* Some planar formats require chroma channel swapping by hand. */
221 	swap = sun4i_frontend_format_chroma_requires_swap(fb->format->format);
222 
223 	/* Set the physical address of the buffer in memory */
224 	dma_addr = drm_fb_dma_get_gem_addr(fb, state, 0);
225 	DRM_DEBUG_DRIVER("Setting buffer #0 address to %pad\n", &dma_addr);
226 	regmap_write(frontend->regs, SUN4I_FRONTEND_BUF_ADDR0_REG, dma_addr);
227 
228 	if (fb->format->num_planes > 1) {
229 		dma_addr = drm_fb_dma_get_gem_addr(fb, state, swap ? 2 : 1);
230 		DRM_DEBUG_DRIVER("Setting buffer #1 address to %pad\n",
231 				 &dma_addr);
232 		regmap_write(frontend->regs, SUN4I_FRONTEND_BUF_ADDR1_REG,
233 			     dma_addr);
234 	}
235 
236 	if (fb->format->num_planes > 2) {
237 		dma_addr = drm_fb_dma_get_gem_addr(fb, state, swap ? 1 : 2);
238 		DRM_DEBUG_DRIVER("Setting buffer #2 address to %pad\n",
239 				 &dma_addr);
240 		regmap_write(frontend->regs, SUN4I_FRONTEND_BUF_ADDR2_REG,
241 			     dma_addr);
242 	}
243 }
244 EXPORT_SYMBOL(sun4i_frontend_update_buffer);
245 
246 static int
247 sun4i_frontend_drm_format_to_input_fmt(const struct drm_format_info *format,
248 				       u32 *val)
249 {
250 	if (!format->is_yuv)
251 		*val = SUN4I_FRONTEND_INPUT_FMT_DATA_FMT_RGB;
252 	else if (drm_format_info_is_yuv_sampling_411(format))
253 		*val = SUN4I_FRONTEND_INPUT_FMT_DATA_FMT_YUV411;
254 	else if (drm_format_info_is_yuv_sampling_420(format))
255 		*val = SUN4I_FRONTEND_INPUT_FMT_DATA_FMT_YUV420;
256 	else if (drm_format_info_is_yuv_sampling_422(format))
257 		*val = SUN4I_FRONTEND_INPUT_FMT_DATA_FMT_YUV422;
258 	else if (drm_format_info_is_yuv_sampling_444(format))
259 		*val = SUN4I_FRONTEND_INPUT_FMT_DATA_FMT_YUV444;
260 	else
261 		return -EINVAL;
262 
263 	return 0;
264 }
265 
266 static int
267 sun4i_frontend_drm_format_to_input_mode(const struct drm_format_info *format,
268 					uint64_t modifier, u32 *val)
269 {
270 	bool tiled = (modifier == DRM_FORMAT_MOD_ALLWINNER_TILED);
271 
272 	switch (format->num_planes) {
273 	case 1:
274 		*val = SUN4I_FRONTEND_INPUT_FMT_DATA_MOD_PACKED;
275 		return 0;
276 
277 	case 2:
278 		*val = tiled ? SUN4I_FRONTEND_INPUT_FMT_DATA_MOD_MB32_SEMIPLANAR
279 			     : SUN4I_FRONTEND_INPUT_FMT_DATA_MOD_SEMIPLANAR;
280 		return 0;
281 
282 	case 3:
283 		*val = tiled ? SUN4I_FRONTEND_INPUT_FMT_DATA_MOD_MB32_PLANAR
284 			     : SUN4I_FRONTEND_INPUT_FMT_DATA_MOD_PLANAR;
285 		return 0;
286 
287 	default:
288 		return -EINVAL;
289 	}
290 }
291 
292 static int
293 sun4i_frontend_drm_format_to_input_sequence(const struct drm_format_info *format,
294 					    u32 *val)
295 {
296 	/* Planar formats have an explicit input sequence. */
297 	if (drm_format_info_is_yuv_planar(format)) {
298 		*val = 0;
299 		return 0;
300 	}
301 
302 	switch (format->format) {
303 	case DRM_FORMAT_BGRX8888:
304 		*val = SUN4I_FRONTEND_INPUT_FMT_DATA_PS_BGRX;
305 		return 0;
306 
307 	case DRM_FORMAT_NV12:
308 		*val = SUN4I_FRONTEND_INPUT_FMT_DATA_PS_UV;
309 		return 0;
310 
311 	case DRM_FORMAT_NV16:
312 		*val = SUN4I_FRONTEND_INPUT_FMT_DATA_PS_UV;
313 		return 0;
314 
315 	case DRM_FORMAT_NV21:
316 		*val = SUN4I_FRONTEND_INPUT_FMT_DATA_PS_VU;
317 		return 0;
318 
319 	case DRM_FORMAT_NV61:
320 		*val = SUN4I_FRONTEND_INPUT_FMT_DATA_PS_VU;
321 		return 0;
322 
323 	case DRM_FORMAT_UYVY:
324 		*val = SUN4I_FRONTEND_INPUT_FMT_DATA_PS_UYVY;
325 		return 0;
326 
327 	case DRM_FORMAT_VYUY:
328 		*val = SUN4I_FRONTEND_INPUT_FMT_DATA_PS_VYUY;
329 		return 0;
330 
331 	case DRM_FORMAT_XRGB8888:
332 		*val = SUN4I_FRONTEND_INPUT_FMT_DATA_PS_XRGB;
333 		return 0;
334 
335 	case DRM_FORMAT_YUYV:
336 		*val = SUN4I_FRONTEND_INPUT_FMT_DATA_PS_YUYV;
337 		return 0;
338 
339 	case DRM_FORMAT_YVYU:
340 		*val = SUN4I_FRONTEND_INPUT_FMT_DATA_PS_YVYU;
341 		return 0;
342 
343 	default:
344 		return -EINVAL;
345 	}
346 }
347 
348 static int sun4i_frontend_drm_format_to_output_fmt(uint32_t fmt, u32 *val)
349 {
350 	switch (fmt) {
351 	case DRM_FORMAT_BGRX8888:
352 		*val = SUN4I_FRONTEND_OUTPUT_FMT_DATA_FMT_BGRX8888;
353 		return 0;
354 
355 	case DRM_FORMAT_XRGB8888:
356 		*val = SUN4I_FRONTEND_OUTPUT_FMT_DATA_FMT_XRGB8888;
357 		return 0;
358 
359 	default:
360 		return -EINVAL;
361 	}
362 }
363 
364 static const uint32_t sun4i_frontend_formats[] = {
365 	DRM_FORMAT_BGRX8888,
366 	DRM_FORMAT_NV12,
367 	DRM_FORMAT_NV16,
368 	DRM_FORMAT_NV21,
369 	DRM_FORMAT_NV61,
370 	DRM_FORMAT_UYVY,
371 	DRM_FORMAT_VYUY,
372 	DRM_FORMAT_XRGB8888,
373 	DRM_FORMAT_YUV411,
374 	DRM_FORMAT_YUV420,
375 	DRM_FORMAT_YUV422,
376 	DRM_FORMAT_YUV444,
377 	DRM_FORMAT_YUYV,
378 	DRM_FORMAT_YVU411,
379 	DRM_FORMAT_YVU420,
380 	DRM_FORMAT_YVU422,
381 	DRM_FORMAT_YVU444,
382 	DRM_FORMAT_YVYU,
383 };
384 
385 bool sun4i_frontend_format_is_supported(uint32_t fmt, uint64_t modifier)
386 {
387 	unsigned int i;
388 
389 	if (modifier == DRM_FORMAT_MOD_ALLWINNER_TILED)
390 		return sun4i_frontend_format_supports_tiling(fmt);
391 	else if (modifier != DRM_FORMAT_MOD_LINEAR)
392 		return false;
393 
394 	for (i = 0; i < ARRAY_SIZE(sun4i_frontend_formats); i++)
395 		if (sun4i_frontend_formats[i] == fmt)
396 			return true;
397 
398 	return false;
399 }
400 EXPORT_SYMBOL(sun4i_frontend_format_is_supported);
401 
402 int sun4i_frontend_update_formats(struct sun4i_frontend *frontend,
403 				  struct drm_plane *plane, uint32_t out_fmt)
404 {
405 	struct drm_plane_state *state = plane->state;
406 	struct drm_framebuffer *fb = state->fb;
407 	const struct drm_format_info *format = fb->format;
408 	uint64_t modifier = fb->modifier;
409 	unsigned int ch1_phase_idx;
410 	u32 out_fmt_val;
411 	u32 in_fmt_val, in_mod_val, in_ps_val;
412 	unsigned int i;
413 	u32 bypass;
414 	int ret;
415 
416 	ret = sun4i_frontend_drm_format_to_input_fmt(format, &in_fmt_val);
417 	if (ret) {
418 		DRM_DEBUG_DRIVER("Invalid input format\n");
419 		return ret;
420 	}
421 
422 	ret = sun4i_frontend_drm_format_to_input_mode(format, modifier,
423 						      &in_mod_val);
424 	if (ret) {
425 		DRM_DEBUG_DRIVER("Invalid input mode\n");
426 		return ret;
427 	}
428 
429 	ret = sun4i_frontend_drm_format_to_input_sequence(format, &in_ps_val);
430 	if (ret) {
431 		DRM_DEBUG_DRIVER("Invalid pixel sequence\n");
432 		return ret;
433 	}
434 
435 	ret = sun4i_frontend_drm_format_to_output_fmt(out_fmt, &out_fmt_val);
436 	if (ret) {
437 		DRM_DEBUG_DRIVER("Invalid output format\n");
438 		return ret;
439 	}
440 
441 	/*
442 	 * I have no idea what this does exactly, but it seems to be
443 	 * related to the scaler FIR filter phase parameters.
444 	 */
445 	ch1_phase_idx = (format->num_planes > 1) ? 1 : 0;
446 	regmap_write(frontend->regs, SUN4I_FRONTEND_CH0_HORZPHASE_REG,
447 		     frontend->data->ch_phase[0]);
448 	regmap_write(frontend->regs, SUN4I_FRONTEND_CH1_HORZPHASE_REG,
449 		     frontend->data->ch_phase[ch1_phase_idx]);
450 	regmap_write(frontend->regs, SUN4I_FRONTEND_CH0_VERTPHASE0_REG,
451 		     frontend->data->ch_phase[0]);
452 	regmap_write(frontend->regs, SUN4I_FRONTEND_CH1_VERTPHASE0_REG,
453 		     frontend->data->ch_phase[ch1_phase_idx]);
454 	regmap_write(frontend->regs, SUN4I_FRONTEND_CH0_VERTPHASE1_REG,
455 		     frontend->data->ch_phase[0]);
456 	regmap_write(frontend->regs, SUN4I_FRONTEND_CH1_VERTPHASE1_REG,
457 		     frontend->data->ch_phase[ch1_phase_idx]);
458 
459 	/*
460 	 * Checking the input format is sufficient since we currently only
461 	 * support RGB output formats to the backend. If YUV output formats
462 	 * ever get supported, an YUV input and output would require bypassing
463 	 * the CSC engine too.
464 	 */
465 	if (format->is_yuv) {
466 		/* Setup the CSC engine for YUV to RGB conversion. */
467 		bypass = 0;
468 
469 		for (i = 0; i < ARRAY_SIZE(sunxi_bt601_yuv2rgb_coef); i++)
470 			regmap_write(frontend->regs,
471 				     SUN4I_FRONTEND_CSC_COEF_REG(i),
472 				     sunxi_bt601_yuv2rgb_coef[i]);
473 	} else {
474 		bypass = SUN4I_FRONTEND_BYPASS_CSC_EN;
475 	}
476 
477 	regmap_update_bits(frontend->regs, SUN4I_FRONTEND_BYPASS_REG,
478 			   SUN4I_FRONTEND_BYPASS_CSC_EN, bypass);
479 
480 	regmap_write(frontend->regs, SUN4I_FRONTEND_INPUT_FMT_REG,
481 		     in_mod_val | in_fmt_val | in_ps_val);
482 
483 	/*
484 	 * TODO: It look like the A31 and A80 at least will need the
485 	 * bit 7 (ALPHA_EN) enabled when using a format with alpha (so
486 	 * ARGB8888).
487 	 */
488 	regmap_write(frontend->regs, SUN4I_FRONTEND_OUTPUT_FMT_REG,
489 		     out_fmt_val);
490 
491 	return 0;
492 }
493 EXPORT_SYMBOL(sun4i_frontend_update_formats);
494 
495 void sun4i_frontend_update_coord(struct sun4i_frontend *frontend,
496 				 struct drm_plane *plane)
497 {
498 	struct drm_plane_state *state = plane->state;
499 	struct drm_framebuffer *fb = state->fb;
500 	uint32_t luma_width, luma_height;
501 	uint32_t chroma_width, chroma_height;
502 
503 	/* Set height and width */
504 	DRM_DEBUG_DRIVER("Frontend size W: %u H: %u\n",
505 			 state->crtc_w, state->crtc_h);
506 
507 	luma_width = state->src_w >> 16;
508 	luma_height = state->src_h >> 16;
509 
510 	chroma_width = DIV_ROUND_UP(luma_width, fb->format->hsub);
511 	chroma_height = DIV_ROUND_UP(luma_height, fb->format->vsub);
512 
513 	regmap_write(frontend->regs, SUN4I_FRONTEND_CH0_INSIZE_REG,
514 		     SUN4I_FRONTEND_INSIZE(luma_height, luma_width));
515 	regmap_write(frontend->regs, SUN4I_FRONTEND_CH1_INSIZE_REG,
516 		     SUN4I_FRONTEND_INSIZE(chroma_height, chroma_width));
517 
518 	regmap_write(frontend->regs, SUN4I_FRONTEND_CH0_OUTSIZE_REG,
519 		     SUN4I_FRONTEND_OUTSIZE(state->crtc_h, state->crtc_w));
520 	regmap_write(frontend->regs, SUN4I_FRONTEND_CH1_OUTSIZE_REG,
521 		     SUN4I_FRONTEND_OUTSIZE(state->crtc_h, state->crtc_w));
522 
523 	regmap_write(frontend->regs, SUN4I_FRONTEND_CH0_HORZFACT_REG,
524 		     (luma_width << 16) / state->crtc_w);
525 	regmap_write(frontend->regs, SUN4I_FRONTEND_CH1_HORZFACT_REG,
526 		     (chroma_width << 16) / state->crtc_w);
527 
528 	regmap_write(frontend->regs, SUN4I_FRONTEND_CH0_VERTFACT_REG,
529 		     (luma_height << 16) / state->crtc_h);
530 	regmap_write(frontend->regs, SUN4I_FRONTEND_CH1_VERTFACT_REG,
531 		     (chroma_height << 16) / state->crtc_h);
532 
533 	regmap_write_bits(frontend->regs, SUN4I_FRONTEND_FRM_CTRL_REG,
534 			  SUN4I_FRONTEND_FRM_CTRL_REG_RDY,
535 			  SUN4I_FRONTEND_FRM_CTRL_REG_RDY);
536 }
537 EXPORT_SYMBOL(sun4i_frontend_update_coord);
538 
539 int sun4i_frontend_enable(struct sun4i_frontend *frontend)
540 {
541 	regmap_write_bits(frontend->regs, SUN4I_FRONTEND_FRM_CTRL_REG,
542 			  SUN4I_FRONTEND_FRM_CTRL_FRM_START,
543 			  SUN4I_FRONTEND_FRM_CTRL_FRM_START);
544 
545 	return 0;
546 }
547 EXPORT_SYMBOL(sun4i_frontend_enable);
548 
549 static const struct regmap_config sun4i_frontend_regmap_config = {
550 	.reg_bits	= 32,
551 	.val_bits	= 32,
552 	.reg_stride	= 4,
553 	.max_register	= 0x0a14,
554 };
555 
556 static int sun4i_frontend_bind(struct device *dev, struct device *master,
557 			 void *data)
558 {
559 	struct platform_device *pdev = to_platform_device(dev);
560 	struct sun4i_frontend *frontend;
561 	struct drm_device *drm = data;
562 	struct sun4i_drv *drv = drm->dev_private;
563 	void __iomem *regs;
564 
565 	frontend = devm_kzalloc(dev, sizeof(*frontend), GFP_KERNEL);
566 	if (!frontend)
567 		return -ENOMEM;
568 
569 	dev_set_drvdata(dev, frontend);
570 	frontend->dev = dev;
571 	frontend->node = dev->of_node;
572 
573 	frontend->data = of_device_get_match_data(dev);
574 	if (!frontend->data)
575 		return -ENODEV;
576 
577 	regs = devm_platform_ioremap_resource(pdev, 0);
578 	if (IS_ERR(regs))
579 		return PTR_ERR(regs);
580 
581 	frontend->regs = devm_regmap_init_mmio(dev, regs,
582 					       &sun4i_frontend_regmap_config);
583 	if (IS_ERR(frontend->regs)) {
584 		dev_err(dev, "Couldn't create the frontend regmap\n");
585 		return PTR_ERR(frontend->regs);
586 	}
587 
588 	frontend->reset = devm_reset_control_get(dev, NULL);
589 	if (IS_ERR(frontend->reset)) {
590 		dev_err(dev, "Couldn't get our reset line\n");
591 		return PTR_ERR(frontend->reset);
592 	}
593 
594 	frontend->bus_clk = devm_clk_get(dev, "ahb");
595 	if (IS_ERR(frontend->bus_clk)) {
596 		dev_err(dev, "Couldn't get our bus clock\n");
597 		return PTR_ERR(frontend->bus_clk);
598 	}
599 
600 	frontend->mod_clk = devm_clk_get(dev, "mod");
601 	if (IS_ERR(frontend->mod_clk)) {
602 		dev_err(dev, "Couldn't get our mod clock\n");
603 		return PTR_ERR(frontend->mod_clk);
604 	}
605 
606 	frontend->ram_clk = devm_clk_get(dev, "ram");
607 	if (IS_ERR(frontend->ram_clk)) {
608 		dev_err(dev, "Couldn't get our ram clock\n");
609 		return PTR_ERR(frontend->ram_clk);
610 	}
611 
612 	list_add_tail(&frontend->list, &drv->frontend_list);
613 	pm_runtime_enable(dev);
614 
615 	return 0;
616 }
617 
618 static void sun4i_frontend_unbind(struct device *dev, struct device *master,
619 			    void *data)
620 {
621 	struct sun4i_frontend *frontend = dev_get_drvdata(dev);
622 
623 	list_del(&frontend->list);
624 	pm_runtime_force_suspend(dev);
625 }
626 
627 static const struct component_ops sun4i_frontend_ops = {
628 	.bind	= sun4i_frontend_bind,
629 	.unbind	= sun4i_frontend_unbind,
630 };
631 
632 static int sun4i_frontend_probe(struct platform_device *pdev)
633 {
634 	return component_add(&pdev->dev, &sun4i_frontend_ops);
635 }
636 
637 static void sun4i_frontend_remove(struct platform_device *pdev)
638 {
639 	component_del(&pdev->dev, &sun4i_frontend_ops);
640 }
641 
642 static int sun4i_frontend_runtime_resume(struct device *dev)
643 {
644 	struct sun4i_frontend *frontend = dev_get_drvdata(dev);
645 	int ret;
646 
647 	clk_set_rate(frontend->mod_clk, 300000000);
648 
649 	clk_prepare_enable(frontend->bus_clk);
650 	clk_prepare_enable(frontend->mod_clk);
651 	clk_prepare_enable(frontend->ram_clk);
652 
653 	ret = reset_control_reset(frontend->reset);
654 	if (ret) {
655 		dev_err(dev, "Couldn't reset our device\n");
656 		return ret;
657 	}
658 
659 	regmap_update_bits(frontend->regs, SUN4I_FRONTEND_EN_REG,
660 			   SUN4I_FRONTEND_EN_EN,
661 			   SUN4I_FRONTEND_EN_EN);
662 
663 	sun4i_frontend_scaler_init(frontend);
664 
665 	return 0;
666 }
667 
668 static int sun4i_frontend_runtime_suspend(struct device *dev)
669 {
670 	struct sun4i_frontend *frontend = dev_get_drvdata(dev);
671 
672 	clk_disable_unprepare(frontend->ram_clk);
673 	clk_disable_unprepare(frontend->mod_clk);
674 	clk_disable_unprepare(frontend->bus_clk);
675 
676 	reset_control_assert(frontend->reset);
677 
678 	return 0;
679 }
680 
681 static const struct dev_pm_ops sun4i_frontend_pm_ops = {
682 	.runtime_resume		= sun4i_frontend_runtime_resume,
683 	.runtime_suspend	= sun4i_frontend_runtime_suspend,
684 };
685 
686 static const struct sun4i_frontend_data sun4i_a10_frontend = {
687 	.ch_phase		= { 0x000, 0xfc000 },
688 	.has_coef_rdy		= true,
689 };
690 
691 static const struct sun4i_frontend_data sun8i_a33_frontend = {
692 	.ch_phase		= { 0x400, 0xfc400 },
693 	.has_coef_access_ctrl	= true,
694 };
695 
696 const struct of_device_id sun4i_frontend_of_table[] = {
697 	{
698 		.compatible = "allwinner,sun4i-a10-display-frontend",
699 		.data = &sun4i_a10_frontend
700 	},
701 	{
702 		.compatible = "allwinner,sun7i-a20-display-frontend",
703 		.data = &sun4i_a10_frontend
704 	},
705 	{
706 		.compatible = "allwinner,sun8i-a23-display-frontend",
707 		.data = &sun8i_a33_frontend
708 	},
709 	{
710 		.compatible = "allwinner,sun8i-a33-display-frontend",
711 		.data = &sun8i_a33_frontend
712 	},
713 	{ }
714 };
715 EXPORT_SYMBOL(sun4i_frontend_of_table);
716 MODULE_DEVICE_TABLE(of, sun4i_frontend_of_table);
717 
718 static struct platform_driver sun4i_frontend_driver = {
719 	.probe		= sun4i_frontend_probe,
720 	.remove_new	= sun4i_frontend_remove,
721 	.driver		= {
722 		.name		= "sun4i-frontend",
723 		.of_match_table	= sun4i_frontend_of_table,
724 		.pm		= &sun4i_frontend_pm_ops,
725 	},
726 };
727 module_platform_driver(sun4i_frontend_driver);
728 
729 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
730 MODULE_DESCRIPTION("Allwinner A10 Display Engine Frontend Driver");
731 MODULE_LICENSE("GPL");
732