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1/***************************************************************************
2 * __________ __ ___.
3 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
7 * \/ \/ \/ \/ \/
8 * $Id:$
9 *
10 * Copyright (C) 2010-2011 by Andree Buschmann
11 *
12 * Generic asm helper function used by YUV blitting.
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version 2
17 * of the License, or (at your option) any later version.
18 *
19 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
20 * KIND, either express or implied.
21 *
22 ****************************************************************************/
23
24#include "config.h"
25#include "cpu.h"
26
27/****************************************************************************
28 * #define FORCE_FIFO_WAIT
29 *
30 * This is not needed in YUV blitting when the LCD IF is fast enough. In this
31 * case YUV-to-RGB conversion per pixel needs longer than the transfer of a
32 * pixel via the LCD IF.
33 ****************************************************************************/
34
35#include "config.h"
36
37/* Set FIFO wait for both iPod Color and iPod nano1G until we know for which
38 * devices we can switch this off. */
39#define FORCE_FIFO_WAIT
40
41 .section .icode, "ax", %progbits
42
43/****************************************************************************
44 * extern void lcd_write_yuv420_lines(unsigned char const * const src[3],
45 * const unsigned LCD_BASE,
46 * int width,
47 * int stride);
48 *
49 * Conversion from Motion JPEG and MPEG Y'PbPr to RGB is:
50 * |R| |1.164 0.000 1.596| |Y' - 16|
51 * |G| = |1.164 -0.391 -0.813| |Pb - 128|
52 * |B| |1.164 2.018 0.000| |Pr - 128|
53 *
54 * Scaled, normalized, rounded and tweaked to yield RGB 565:
55 * |R| |74 0 101| |Y' - 16| >> 9
56 * |G| = |74 -24 -51| |Cb - 128| >> 8
57 * |B| |74 128 0| |Cr - 128| >> 9
58 *
59 * Converts two lines from YUV to RGB565 and writes to LCD at once. First loop
60 * loads Cb/Cr, calculates the chroma offset and saves them to buffer. Within
61 * the second loop these chroma offset are reloaded from buffer. Within each
62 * loop two pixels are calculated and written to LCD.
63 */
64 .align 2
65 .global lcd_write_yuv420_lines
66 .type lcd_write_yuv420_lines, %function
67lcd_write_yuv420_lines:
68 /* r0 = src = yuv_src */
69 /* r1 = dst = LCD_BASE */
70 /* r2 = width */
71 /* r3 = stride */
72 stmfd sp!, { r4-r10, lr } /* save non-scratch */
73 ldmia r0, { r9, r10, r12 } /* r9 = yuv_src[0] = Y'_p */
74 /* r10 = yuv_src[1] = Cb_p */
75 /* r12 = yuv_src[2] = Cr_p */
76 add r3, r9, r3 /* r3 = &ysrc[stride] */
77 add r4, r2, r2, asr #1 /* chroma buffer lenght = width/2 *3 */
78 mov r4, r4, asl #2 /* use words for str/ldm possibility */
79 add r4, r4, #19 /* plus room for 4 additional words, */
80 bic r4, r4, #3 /* rounded up to multiples of 4 byte */
81 sub sp, sp, r4 /* and allocate on stack */
82 stmia sp, {r1-r4} /* LCD_BASE, width, &ysrc[stride], stack_alloc */
83
84 mov r7, r2 /* r7 = loop count */
85 add r8, sp, #16 /* chroma buffer */
86 add lr, r1, #0x100 /* LCD data port = LCD2_BASE + 0x100 */
87
88 /* 1st loop start */
8910: /* loop start */
90
91 ldrb r0, [r10], #1 /* r0 = *usrc++ = *Cb_p++ */
92 ldrb r1, [r12], #1 /* r1 = *vsrc++ = *Cr_p++ */
93
94 sub r0, r0, #128 /* r0 = Cb-128 */
95 sub r1, r1, #128 /* r1 = Cr-128 */
96
97 add r2, r1, r1, asl #1 /* r2 = Cr*51 + Cb*24 */
98 add r2, r2, r2, asl #4
99 add r2, r2, r0, asl #3
100 add r2, r2, r0, asl #4
101
102 add r4, r1, r1, asl #2 /* r1 = Cr*101 */
103 add r4, r4, r1, asl #5
104 add r1, r4, r1, asl #6
105
106 add r1, r1, #256 /* r1 = rv = (r1 + 256) >> 9 */
107 mov r1, r1, asr #9
108 rsb r2, r2, #128 /* r2 = guv = (-r2 + 128) >> 8 */
109 mov r2, r2, asr #8
110 add r0, r0, #2 /* r0 = bu = (Cb*128 + 256) >> 9 */
111 mov r0, r0, asr #2
112 stmia r8!, {r0-r2} /* store r0, r1 and r2 to chroma buffer */
113
114 /* 1st loop, first pixel */
115 ldrb r5, [r9], #1 /* r5 = *ysrc++ = *Y'_p++ */
116 sub r5, r5, #16 /* r5 = (Y'-16) * 74 */
117 add r3, r5, r5, asl #2
118 add r5, r3, r5, asl #5
119
120 add r6, r1, r5, asr #8 /* r6 = r = (Y >> 9) + rv */
121 add r3, r2, r5, asr #7 /* r3 = g = (Y >> 8) + guv */
122 add r4, r0, r5, asr #8 /* r4 = b = (Y >> 9) + bu */
123
124 orr r5, r6, r4 /* check if clamping is needed... */
125 orr r5, r5, r3, asr #1 /* ...at all */
126 cmp r5, #31
127 bls 15f /* -> no clamp */
128 cmp r6, #31 /* clamp r */
129 mvnhi r6, r6, asr #31
130 andhi r6, r6, #31
131 cmp r3, #63 /* clamp g */
132 mvnhi r3, r3, asr #31
133 andhi r3, r3, #63
134 cmp r4, #31 /* clamp b */
135 mvnhi r4, r4, asr #31
136 andhi r4, r4, #31
13715: /* no clamp */
138
139 /* calculate pixel_1 and save to r4 for later pixel packing */
140 orr r4, r4, r3, lsl #5 /* pixel_1 = r<<11 | g<<5 | b */
141 orr r4, r4, r6, lsl #11 /* r4 = pixel_1 */
142
143 /* 1st loop, second pixel */
144 ldrb r5, [r9], #1 /* r5 = *ysrc++ = *Y'_p++ */
145 sub r5, r5, #16 /* r5 = (Y'-16) * 74 */
146 add r3, r5, r5, asl #2
147 add r5, r3, r5, asl #5
148
149 add r6, r1, r5, asr #8 /* r6 = r = (Y >> 9) + rv */
150 add r3, r2, r5, asr #7 /* r3 = g = (Y >> 8) + guv */
151 add r5, r0, r5, asr #8 /* r5 = b = (Y >> 9) + bu */
152
153 orr r0, r6, r5 /* check if clamping is needed... */
154 orr r0, r0, r3, asr #1 /* ...at all */
155 cmp r0, #31
156 bls 15f /* -> no clamp */
157 cmp r6, #31 /* clamp r */
158 mvnhi r6, r6, asr #31
159 andhi r6, r6, #31
160 cmp r3, #63 /* clamp g */
161 mvnhi r3, r3, asr #31
162 andhi r3, r3, #63
163 cmp r5, #31 /* clamp b */
164 mvnhi r5, r5, asr #31
165 andhi r5, r5, #31
16615: /* no clamp */
167
168 /* calculate pixel_2 and pack with pixel_1 before writing */
169 orr r5, r5, r3, lsl #5 /* pixel_2 = r<<11 | g<<5 | b */
170 orr r5, r5, r6, lsl #11 /* r5 = pixel_2 */
171#ifdef FORCE_FIFO_WAIT
172 /* wait for FIFO half full */
173.fifo_wait1:
174 ldr r3, [lr, #-0xE0] /* while !(LCD2_BLOCK_CTRL & 0x1000000); */
175 tst r3, #0x1000000
176 beq .fifo_wait1
177#endif
178
179 mov r3, r4, lsl #8 /* swap pixel_1 */
180 and r3, r3, #0xff00
181 add r4, r3, r4, lsr #8
182
183 orr r4, r4, r5, lsl #24 /* swap pixel_2 and pack with pixel_1 */
184 mov r5, r5, lsr #8
185 orr r4, r4, r5, lsl #16
186
187 str r4, [lr] /* write pixel_1 and pixel_2 */
188
189 subs r7, r7, #2 /* check for loop end */
190 bgt 10b /* back to beginning */
191 /* 1st loop end */
192
193 /* Reload several registers for pointer rewinding for next loop */
194 add r8, sp, #16 /* chroma buffer */
195 ldmia sp, { r1, r7, r9} /* r1 = LCD_BASE */
196 /* r7 = loop count */
197 /* r9 = &ysrc[stride] */
198
199 /* 2nd loop start */
20020: /* loop start */
201 /* restore r0 (bu), r1 (rv) and r2 (guv) from chroma buffer */
202 ldmia r8!, {r0-r2}
203
204 /* 2nd loop, first pixel */
205 ldrb r5, [r9], #1 /* r5 = *ysrc++ = *Y'_p++ */
206 sub r5, r5, #16 /* r5 = (Y'-16) * 74 */
207 add r3, r5, r5, asl #2
208 add r5, r3, r5, asl #5
209
210 add r6, r1, r5, asr #8 /* r6 = r = (Y >> 9) + rv */
211 add r3, r2, r5, asr #7 /* r3 = g = (Y >> 8) + guv */
212 add r4, r0, r5, asr #8 /* r4 = b = (Y >> 9) + bu */
213
214 orr r5, r6, r4 /* check if clamping is needed... */
215 orr r5, r5, r3, asr #1 /* ...at all */
216 cmp r5, #31
217 bls 15f /* -> no clamp */
218 cmp r6, #31 /* clamp r */
219 mvnhi r6, r6, asr #31
220 andhi r6, r6, #31
221 cmp r3, #63 /* clamp g */
222 mvnhi r3, r3, asr #31
223 andhi r3, r3, #63
224 cmp r4, #31 /* clamp b */
225 mvnhi r4, r4, asr #31
226 andhi r4, r4, #31
22715: /* no clamp */
228 /* calculate pixel_1 and save to r4 for later pixel packing */
229 orr r4, r4, r3, lsl #5 /* pixel_1 = r<<11 | g<<5 | b */
230 orr r4, r4, r6, lsl #11 /* r4 = pixel_1 */
231
232 /* 2nd loop, second pixel */
233 ldrb r5, [r9], #1 /* r5 = *ysrc++ = *Y'_p++ */
234 sub r5, r5, #16 /* r5 = (Y'-16) * 74 */
235 add r3, r5, r5, asl #2
236 add r5, r3, r5, asl #5
237
238 add r6, r1, r5, asr #8 /* r6 = r = (Y >> 9) + rv */
239 add r3, r2, r5, asr #7 /* r3 = g = (Y >> 8) + guv */
240 add r5, r0, r5, asr #8 /* r5 = b = (Y >> 9) + bu */
241
242 orr r0, r6, r5 /* check if clamping is needed... */
243 orr r0, r0, r3, asr #1 /* ...at all */
244 cmp r0, #31
245 bls 15f /* -> no clamp */
246 cmp r6, #31 /* clamp r */
247 mvnhi r6, r6, asr #31
248 andhi r6, r6, #31
249 cmp r3, #63 /* clamp g */
250 mvnhi r3, r3, asr #31
251 andhi r3, r3, #63
252 cmp r5, #31 /* clamp b */
253 mvnhi r5, r5, asr #31
254 andhi r5, r5, #31
25515: /* no clamp */
256
257 /* calculate pixel_2 and pack with pixel_1 before writing */
258 orr r5, r5, r3, lsl #5 /* pixel_2 = r<<11 | g<<5 | b */
259 orr r5, r5, r6, lsl #11 /* r5 = pixel_2 */
260#ifdef FORCE_FIFO_WAIT
261 /* wait for FIFO half full */
262.fifo_wait2:
263 ldr r3, [lr, #-0xE0] /* while !(LCD2_BLOCK_CTRL & 0x1000000); */
264 tst r3, #0x1000000
265 beq .fifo_wait2
266#endif
267
268 mov r3, r4, lsl #8 /* swap pixel_1 */
269 and r3, r3, #0xff00
270 add r4, r3, r4, lsr #8
271
272 orr r4, r4, r5, lsl #24 /* swap pixel_2 and pack with pixel_1 */
273 mov r5, r5, lsr #8
274 orr r4, r4, r5, lsl #16
275
276 str r4, [lr] /* write pixel_1 and pixel_2 */
277
278 subs r7, r7, #2 /* check for loop end */
279 bgt 20b /* back to beginning */
280 /* 2nd loop end */
281
282 ldr r3, [sp, #12]
283 add sp, sp, r3 /* deallocate buffer */
284 ldmpc regs=r4-r10 /* restore registers */
285
286 .ltorg
287 .size lcd_write_yuv420_lines, .-lcd_write_yuv420_lines
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