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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (C) 2016 Noralf Trønnes
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 */
10
11#include <linux/module.h>
12#include <linux/slab.h>
13#include <linux/io.h>
14
15#include <drm/drm_format_helper.h>
16#include <drm/drm_framebuffer.h>
17#include <drm/drm_fourcc.h>
18#include <drm/drm_rect.h>
19
20static unsigned int clip_offset(struct drm_rect *clip,
21 unsigned int pitch, unsigned int cpp)
22{
23 return clip->y1 * pitch + clip->x1 * cpp;
24}
25
26/**
27 * drm_fb_memcpy - Copy clip buffer
28 * @dst: Destination buffer
29 * @vaddr: Source buffer
30 * @fb: DRM framebuffer
31 * @clip: Clip rectangle area to copy
32 *
33 * This function does not apply clipping on dst, i.e. the destination
34 * is a small buffer containing the clip rect only.
35 */
36void drm_fb_memcpy(void *dst, void *vaddr, struct drm_framebuffer *fb,
37 struct drm_rect *clip)
38{
39 unsigned int cpp = fb->format->cpp[0];
40 size_t len = (clip->x2 - clip->x1) * cpp;
41 unsigned int y, lines = clip->y2 - clip->y1;
42
43 vaddr += clip_offset(clip, fb->pitches[0], cpp);
44 for (y = 0; y < lines; y++) {
45 memcpy(dst, vaddr, len);
46 vaddr += fb->pitches[0];
47 dst += len;
48 }
49}
50EXPORT_SYMBOL(drm_fb_memcpy);
51
52/**
53 * drm_fb_memcpy_dstclip - Copy clip buffer
54 * @dst: Destination buffer (iomem)
55 * @vaddr: Source buffer
56 * @fb: DRM framebuffer
57 * @clip: Clip rectangle area to copy
58 *
59 * This function applies clipping on dst, i.e. the destination is a
60 * full (iomem) framebuffer but only the clip rect content is copied over.
61 */
62void drm_fb_memcpy_dstclip(void __iomem *dst, void *vaddr,
63 struct drm_framebuffer *fb,
64 struct drm_rect *clip)
65{
66 unsigned int cpp = fb->format->cpp[0];
67 unsigned int offset = clip_offset(clip, fb->pitches[0], cpp);
68 size_t len = (clip->x2 - clip->x1) * cpp;
69 unsigned int y, lines = clip->y2 - clip->y1;
70
71 vaddr += offset;
72 dst += offset;
73 for (y = 0; y < lines; y++) {
74 memcpy_toio(dst, vaddr, len);
75 vaddr += fb->pitches[0];
76 dst += fb->pitches[0];
77 }
78}
79EXPORT_SYMBOL(drm_fb_memcpy_dstclip);
80
81/**
82 * drm_fb_swab16 - Swap bytes into clip buffer
83 * @dst: RGB565 destination buffer
84 * @vaddr: RGB565 source buffer
85 * @fb: DRM framebuffer
86 * @clip: Clip rectangle area to copy
87 */
88void drm_fb_swab16(u16 *dst, void *vaddr, struct drm_framebuffer *fb,
89 struct drm_rect *clip)
90{
91 size_t len = (clip->x2 - clip->x1) * sizeof(u16);
92 unsigned int x, y;
93 u16 *src, *buf;
94
95 /*
96 * The cma memory is write-combined so reads are uncached.
97 * Speed up by fetching one line at a time.
98 */
99 buf = kmalloc(len, GFP_KERNEL);
100 if (!buf)
101 return;
102
103 for (y = clip->y1; y < clip->y2; y++) {
104 src = vaddr + (y * fb->pitches[0]);
105 src += clip->x1;
106 memcpy(buf, src, len);
107 src = buf;
108 for (x = clip->x1; x < clip->x2; x++)
109 *dst++ = swab16(*src++);
110 }
111
112 kfree(buf);
113}
114EXPORT_SYMBOL(drm_fb_swab16);
115
116static void drm_fb_xrgb8888_to_rgb565_line(u16 *dbuf, u32 *sbuf,
117 unsigned int pixels,
118 bool swab)
119{
120 unsigned int x;
121 u16 val16;
122
123 for (x = 0; x < pixels; x++) {
124 val16 = ((sbuf[x] & 0x00F80000) >> 8) |
125 ((sbuf[x] & 0x0000FC00) >> 5) |
126 ((sbuf[x] & 0x000000F8) >> 3);
127 if (swab)
128 dbuf[x] = swab16(val16);
129 else
130 dbuf[x] = val16;
131 }
132}
133
134/**
135 * drm_fb_xrgb8888_to_rgb565 - Convert XRGB8888 to RGB565 clip buffer
136 * @dst: RGB565 destination buffer
137 * @vaddr: XRGB8888 source buffer
138 * @fb: DRM framebuffer
139 * @clip: Clip rectangle area to copy
140 * @swab: Swap bytes
141 *
142 * Drivers can use this function for RGB565 devices that don't natively
143 * support XRGB8888.
144 *
145 * This function does not apply clipping on dst, i.e. the destination
146 * is a small buffer containing the clip rect only.
147 */
148void drm_fb_xrgb8888_to_rgb565(void *dst, void *vaddr,
149 struct drm_framebuffer *fb,
150 struct drm_rect *clip, bool swab)
151{
152 size_t linepixels = clip->x2 - clip->x1;
153 size_t src_len = linepixels * sizeof(u32);
154 size_t dst_len = linepixels * sizeof(u16);
155 unsigned y, lines = clip->y2 - clip->y1;
156 void *sbuf;
157
158 /*
159 * The cma memory is write-combined so reads are uncached.
160 * Speed up by fetching one line at a time.
161 */
162 sbuf = kmalloc(src_len, GFP_KERNEL);
163 if (!sbuf)
164 return;
165
166 vaddr += clip_offset(clip, fb->pitches[0], sizeof(u32));
167 for (y = 0; y < lines; y++) {
168 memcpy(sbuf, vaddr, src_len);
169 drm_fb_xrgb8888_to_rgb565_line(dst, sbuf, linepixels, swab);
170 vaddr += fb->pitches[0];
171 dst += dst_len;
172 }
173
174 kfree(sbuf);
175}
176EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb565);
177
178/**
179 * drm_fb_xrgb8888_to_rgb565_dstclip - Convert XRGB8888 to RGB565 clip buffer
180 * @dst: RGB565 destination buffer (iomem)
181 * @dst_pitch: destination buffer pitch
182 * @vaddr: XRGB8888 source buffer
183 * @fb: DRM framebuffer
184 * @clip: Clip rectangle area to copy
185 * @swab: Swap bytes
186 *
187 * Drivers can use this function for RGB565 devices that don't natively
188 * support XRGB8888.
189 *
190 * This function applies clipping on dst, i.e. the destination is a
191 * full (iomem) framebuffer but only the clip rect content is copied over.
192 */
193void drm_fb_xrgb8888_to_rgb565_dstclip(void __iomem *dst, unsigned int dst_pitch,
194 void *vaddr, struct drm_framebuffer *fb,
195 struct drm_rect *clip, bool swab)
196{
197 size_t linepixels = clip->x2 - clip->x1;
198 size_t dst_len = linepixels * sizeof(u16);
199 unsigned y, lines = clip->y2 - clip->y1;
200 void *dbuf;
201
202 dbuf = kmalloc(dst_len, GFP_KERNEL);
203 if (!dbuf)
204 return;
205
206 vaddr += clip_offset(clip, fb->pitches[0], sizeof(u32));
207 dst += clip_offset(clip, dst_pitch, sizeof(u16));
208 for (y = 0; y < lines; y++) {
209 drm_fb_xrgb8888_to_rgb565_line(dbuf, vaddr, linepixels, swab);
210 memcpy_toio(dst, dbuf, dst_len);
211 vaddr += fb->pitches[0];
212 dst += dst_len;
213 }
214
215 kfree(dbuf);
216}
217EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb565_dstclip);
218
219static void drm_fb_xrgb8888_to_rgb888_line(u8 *dbuf, u32 *sbuf,
220 unsigned int pixels)
221{
222 unsigned int x;
223
224 for (x = 0; x < pixels; x++) {
225 *dbuf++ = (sbuf[x] & 0x000000FF) >> 0;
226 *dbuf++ = (sbuf[x] & 0x0000FF00) >> 8;
227 *dbuf++ = (sbuf[x] & 0x00FF0000) >> 16;
228 }
229}
230
231/**
232 * drm_fb_xrgb8888_to_rgb888_dstclip - Convert XRGB8888 to RGB888 clip buffer
233 * @dst: RGB565 destination buffer (iomem)
234 * @dst_pitch: destination buffer pitch
235 * @vaddr: XRGB8888 source buffer
236 * @fb: DRM framebuffer
237 * @clip: Clip rectangle area to copy
238 *
239 * Drivers can use this function for RGB888 devices that don't natively
240 * support XRGB8888.
241 *
242 * This function applies clipping on dst, i.e. the destination is a
243 * full (iomem) framebuffer but only the clip rect content is copied over.
244 */
245void drm_fb_xrgb8888_to_rgb888_dstclip(void __iomem *dst, unsigned int dst_pitch,
246 void *vaddr, struct drm_framebuffer *fb,
247 struct drm_rect *clip)
248{
249 size_t linepixels = clip->x2 - clip->x1;
250 size_t dst_len = linepixels * 3;
251 unsigned y, lines = clip->y2 - clip->y1;
252 void *dbuf;
253
254 dbuf = kmalloc(dst_len, GFP_KERNEL);
255 if (!dbuf)
256 return;
257
258 vaddr += clip_offset(clip, fb->pitches[0], sizeof(u32));
259 dst += clip_offset(clip, dst_pitch, sizeof(u16));
260 for (y = 0; y < lines; y++) {
261 drm_fb_xrgb8888_to_rgb888_line(dbuf, vaddr, linepixels);
262 memcpy_toio(dst, dbuf, dst_len);
263 vaddr += fb->pitches[0];
264 dst += dst_len;
265 }
266
267 kfree(dbuf);
268}
269EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb888_dstclip);
270
271/**
272 * drm_fb_xrgb8888_to_gray8 - Convert XRGB8888 to grayscale
273 * @dst: 8-bit grayscale destination buffer
274 * @vaddr: XRGB8888 source buffer
275 * @fb: DRM framebuffer
276 * @clip: Clip rectangle area to copy
277 *
278 * Drm doesn't have native monochrome or grayscale support.
279 * Such drivers can announce the commonly supported XR24 format to userspace
280 * and use this function to convert to the native format.
281 *
282 * Monochrome drivers will use the most significant bit,
283 * where 1 means foreground color and 0 background color.
284 *
285 * ITU BT.601 is used for the RGB -> luma (brightness) conversion.
286 */
287void drm_fb_xrgb8888_to_gray8(u8 *dst, void *vaddr, struct drm_framebuffer *fb,
288 struct drm_rect *clip)
289{
290 unsigned int len = (clip->x2 - clip->x1) * sizeof(u32);
291 unsigned int x, y;
292 void *buf;
293 u32 *src;
294
295 if (WARN_ON(fb->format->format != DRM_FORMAT_XRGB8888))
296 return;
297 /*
298 * The cma memory is write-combined so reads are uncached.
299 * Speed up by fetching one line at a time.
300 */
301 buf = kmalloc(len, GFP_KERNEL);
302 if (!buf)
303 return;
304
305 for (y = clip->y1; y < clip->y2; y++) {
306 src = vaddr + (y * fb->pitches[0]);
307 src += clip->x1;
308 memcpy(buf, src, len);
309 src = buf;
310 for (x = clip->x1; x < clip->x2; x++) {
311 u8 r = (*src & 0x00ff0000) >> 16;
312 u8 g = (*src & 0x0000ff00) >> 8;
313 u8 b = *src & 0x000000ff;
314
315 /* ITU BT.601: Y = 0.299 R + 0.587 G + 0.114 B */
316 *dst++ = (3 * r + 6 * g + b) / 10;
317 src++;
318 }
319 }
320
321 kfree(buf);
322}
323EXPORT_SYMBOL(drm_fb_xrgb8888_to_gray8);
324