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diff --git a/firmware/target/arm/ipod/lcd-as-color-nano.S b/firmware/target/arm/ipod/lcd-as-color-nano.S
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index f6f9cc5be3..0000000000
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-/***************************************************************************
- * __________ __ ___.
- * Open \______ \ ____ ____ | | _\_ |__ _______ ___
- * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
- * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
- * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
- * \/ \/ \/ \/ \/
- * $Id:$
- *
- * Copyright (C) 2010-2011 by Andree Buschmann
- *
- * Generic asm helper function used by YUV blitting.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
- * KIND, either express or implied.
- *
- ****************************************************************************/
-
-#include "config.h"
-#include "cpu.h"
-
-/****************************************************************************
- * #define FORCE_FIFO_WAIT
- *
- * This is not needed in YUV blitting when the LCD IF is fast enough. In this
- * case YUV-to-RGB conversion per pixel needs longer than the transfer of a
- * pixel via the LCD IF.
- ****************************************************************************/
-
-#include "config.h"
-
-/* Set FIFO wait for both iPod Color and iPod nano1G until we know for which
- * devices we can switch this off. */
-#define FORCE_FIFO_WAIT
-
- .section .icode, "ax", %progbits
-
-/****************************************************************************
- * extern void lcd_write_yuv420_lines(unsigned char const * const src[3],
- * const unsigned LCD_BASE,
- * int width,
- * int stride);
- *
- * Conversion from Motion JPEG and MPEG Y'PbPr to RGB is:
- * |R| |1.164 0.000 1.596| |Y' - 16|
- * |G| = |1.164 -0.391 -0.813| |Pb - 128|
- * |B| |1.164 2.018 0.000| |Pr - 128|
- *
- * Scaled, normalized, rounded and tweaked to yield RGB 565:
- * |R| |74 0 101| |Y' - 16| >> 9
- * |G| = |74 -24 -51| |Cb - 128| >> 8
- * |B| |74 128 0| |Cr - 128| >> 9
- *
- * Converts two lines from YUV to RGB565 and writes to LCD at once. First loop
- * loads Cb/Cr, calculates the chroma offset and saves them to buffer. Within
- * the second loop these chroma offset are reloaded from buffer. Within each
- * loop two pixels are calculated and written to LCD.
- */
- .align 2
- .global lcd_write_yuv420_lines
- .type lcd_write_yuv420_lines, %function
-lcd_write_yuv420_lines:
- /* r0 = src = yuv_src */
- /* r1 = dst = LCD_BASE */
- /* r2 = width */
- /* r3 = stride */
- stmfd sp!, { r4-r10, lr } /* save non-scratch */
- ldmia r0, { r9, r10, r12 } /* r9 = yuv_src[0] = Y'_p */
- /* r10 = yuv_src[1] = Cb_p */
- /* r12 = yuv_src[2] = Cr_p */
- add r3, r9, r3 /* r3 = &ysrc[stride] */
- add r4, r2, r2, asr #1 /* chroma buffer lenght = width/2 *3 */
- mov r4, r4, asl #2 /* use words for str/ldm possibility */
- add r4, r4, #19 /* plus room for 4 additional words, */
- bic r4, r4, #3 /* rounded up to multiples of 4 byte */
- sub sp, sp, r4 /* and allocate on stack */
- stmia sp, {r1-r4} /* LCD_BASE, width, &ysrc[stride], stack_alloc */
-
- mov r7, r2 /* r7 = loop count */
- add r8, sp, #16 /* chroma buffer */
- add lr, r1, #0x100 /* LCD data port = LCD2_BASE + 0x100 */
-
- /* 1st loop start */
-10: /* loop start */
-
- ldrb r0, [r10], #1 /* r0 = *usrc++ = *Cb_p++ */
- ldrb r1, [r12], #1 /* r1 = *vsrc++ = *Cr_p++ */
-
- sub r0, r0, #128 /* r0 = Cb-128 */
- sub r1, r1, #128 /* r1 = Cr-128 */
-
- add r2, r1, r1, asl #1 /* r2 = Cr*51 + Cb*24 */
- add r2, r2, r2, asl #4
- add r2, r2, r0, asl #3
- add r2, r2, r0, asl #4
-
- add r4, r1, r1, asl #2 /* r1 = Cr*101 */
- add r4, r4, r1, asl #5
- add r1, r4, r1, asl #6
-
- add r1, r1, #256 /* r1 = rv = (r1 + 256) >> 9 */
- mov r1, r1, asr #9
- rsb r2, r2, #128 /* r2 = guv = (-r2 + 128) >> 8 */
- mov r2, r2, asr #8
- add r0, r0, #2 /* r0 = bu = (Cb*128 + 256) >> 9 */
- mov r0, r0, asr #2
- stmia r8!, {r0-r2} /* store r0, r1 and r2 to chroma buffer */
-
- /* 1st loop, first pixel */
- ldrb r5, [r9], #1 /* r5 = *ysrc++ = *Y'_p++ */
- sub r5, r5, #16 /* r5 = (Y'-16) * 74 */
- add r3, r5, r5, asl #2
- add r5, r3, r5, asl #5
-
- add r6, r1, r5, asr #8 /* r6 = r = (Y >> 9) + rv */
- add r3, r2, r5, asr #7 /* r3 = g = (Y >> 8) + guv */
- add r4, r0, r5, asr #8 /* r4 = b = (Y >> 9) + bu */
-
- orr r5, r6, r4 /* check if clamping is needed... */
- orr r5, r5, r3, asr #1 /* ...at all */
- cmp r5, #31
- bls 15f /* -> no clamp */
- cmp r6, #31 /* clamp r */
- mvnhi r6, r6, asr #31
- andhi r6, r6, #31
- cmp r3, #63 /* clamp g */
- mvnhi r3, r3, asr #31
- andhi r3, r3, #63
- cmp r4, #31 /* clamp b */
- mvnhi r4, r4, asr #31
- andhi r4, r4, #31
-15: /* no clamp */
-
- /* calculate pixel_1 and save to r4 for later pixel packing */
- orr r4, r4, r3, lsl #5 /* pixel_1 = r<<11 | g<<5 | b */
- orr r4, r4, r6, lsl #11 /* r4 = pixel_1 */
-
- /* 1st loop, second pixel */
- ldrb r5, [r9], #1 /* r5 = *ysrc++ = *Y'_p++ */
- sub r5, r5, #16 /* r5 = (Y'-16) * 74 */
- add r3, r5, r5, asl #2
- add r5, r3, r5, asl #5
-
- add r6, r1, r5, asr #8 /* r6 = r = (Y >> 9) + rv */
- add r3, r2, r5, asr #7 /* r3 = g = (Y >> 8) + guv */
- add r5, r0, r5, asr #8 /* r5 = b = (Y >> 9) + bu */
-
- orr r0, r6, r5 /* check if clamping is needed... */
- orr r0, r0, r3, asr #1 /* ...at all */
- cmp r0, #31
- bls 15f /* -> no clamp */
- cmp r6, #31 /* clamp r */
- mvnhi r6, r6, asr #31
- andhi r6, r6, #31
- cmp r3, #63 /* clamp g */
- mvnhi r3, r3, asr #31
- andhi r3, r3, #63
- cmp r5, #31 /* clamp b */
- mvnhi r5, r5, asr #31
- andhi r5, r5, #31
-15: /* no clamp */
-
- /* calculate pixel_2 and pack with pixel_1 before writing */
- orr r5, r5, r3, lsl #5 /* pixel_2 = r<<11 | g<<5 | b */
- orr r5, r5, r6, lsl #11 /* r5 = pixel_2 */
-#ifdef FORCE_FIFO_WAIT
- /* wait for FIFO half full */
-.fifo_wait1:
- ldr r3, [lr, #-0xE0] /* while !(LCD2_BLOCK_CTRL & 0x1000000); */
- tst r3, #0x1000000
- beq .fifo_wait1
-#endif
-
- mov r3, r4, lsl #8 /* swap pixel_1 */
- and r3, r3, #0xff00
- add r4, r3, r4, lsr #8
-
- orr r4, r4, r5, lsl #24 /* swap pixel_2 and pack with pixel_1 */
- mov r5, r5, lsr #8
- orr r4, r4, r5, lsl #16
-
- str r4, [lr] /* write pixel_1 and pixel_2 */
-
- subs r7, r7, #2 /* check for loop end */
- bgt 10b /* back to beginning */
- /* 1st loop end */
-
- /* Reload several registers for pointer rewinding for next loop */
- add r8, sp, #16 /* chroma buffer */
- ldmia sp, { r1, r7, r9} /* r1 = LCD_BASE */
- /* r7 = loop count */
- /* r9 = &ysrc[stride] */
-
- /* 2nd loop start */
-20: /* loop start */
- /* restore r0 (bu), r1 (rv) and r2 (guv) from chroma buffer */
- ldmia r8!, {r0-r2}
-
- /* 2nd loop, first pixel */
- ldrb r5, [r9], #1 /* r5 = *ysrc++ = *Y'_p++ */
- sub r5, r5, #16 /* r5 = (Y'-16) * 74 */
- add r3, r5, r5, asl #2
- add r5, r3, r5, asl #5
-
- add r6, r1, r5, asr #8 /* r6 = r = (Y >> 9) + rv */
- add r3, r2, r5, asr #7 /* r3 = g = (Y >> 8) + guv */
- add r4, r0, r5, asr #8 /* r4 = b = (Y >> 9) + bu */
-
- orr r5, r6, r4 /* check if clamping is needed... */
- orr r5, r5, r3, asr #1 /* ...at all */
- cmp r5, #31
- bls 15f /* -> no clamp */
- cmp r6, #31 /* clamp r */
- mvnhi r6, r6, asr #31
- andhi r6, r6, #31
- cmp r3, #63 /* clamp g */
- mvnhi r3, r3, asr #31
- andhi r3, r3, #63
- cmp r4, #31 /* clamp b */
- mvnhi r4, r4, asr #31
- andhi r4, r4, #31
-15: /* no clamp */
- /* calculate pixel_1 and save to r4 for later pixel packing */
- orr r4, r4, r3, lsl #5 /* pixel_1 = r<<11 | g<<5 | b */
- orr r4, r4, r6, lsl #11 /* r4 = pixel_1 */
-
- /* 2nd loop, second pixel */
- ldrb r5, [r9], #1 /* r5 = *ysrc++ = *Y'_p++ */
- sub r5, r5, #16 /* r5 = (Y'-16) * 74 */
- add r3, r5, r5, asl #2
- add r5, r3, r5, asl #5
-
- add r6, r1, r5, asr #8 /* r6 = r = (Y >> 9) + rv */
- add r3, r2, r5, asr #7 /* r3 = g = (Y >> 8) + guv */
- add r5, r0, r5, asr #8 /* r5 = b = (Y >> 9) + bu */
-
- orr r0, r6, r5 /* check if clamping is needed... */
- orr r0, r0, r3, asr #1 /* ...at all */
- cmp r0, #31
- bls 15f /* -> no clamp */
- cmp r6, #31 /* clamp r */
- mvnhi r6, r6, asr #31
- andhi r6, r6, #31
- cmp r3, #63 /* clamp g */
- mvnhi r3, r3, asr #31
- andhi r3, r3, #63
- cmp r5, #31 /* clamp b */
- mvnhi r5, r5, asr #31
- andhi r5, r5, #31
-15: /* no clamp */
-
- /* calculate pixel_2 and pack with pixel_1 before writing */
- orr r5, r5, r3, lsl #5 /* pixel_2 = r<<11 | g<<5 | b */
- orr r5, r5, r6, lsl #11 /* r5 = pixel_2 */
-#ifdef FORCE_FIFO_WAIT
- /* wait for FIFO half full */
-.fifo_wait2:
- ldr r3, [lr, #-0xE0] /* while !(LCD2_BLOCK_CTRL & 0x1000000); */
- tst r3, #0x1000000
- beq .fifo_wait2
-#endif
-
- mov r3, r4, lsl #8 /* swap pixel_1 */
- and r3, r3, #0xff00
- add r4, r3, r4, lsr #8
-
- orr r4, r4, r5, lsl #24 /* swap pixel_2 and pack with pixel_1 */
- mov r5, r5, lsr #8
- orr r4, r4, r5, lsl #16
-
- str r4, [lr] /* write pixel_1 and pixel_2 */
-
- subs r7, r7, #2 /* check for loop end */
- bgt 20b /* back to beginning */
- /* 2nd loop end */
-
- ldr r3, [sp, #12]
- add sp, sp, r3 /* deallocate buffer */
- ldmpc regs=r4-r10 /* restore registers */
-
- .ltorg
- .size lcd_write_yuv420_lines, .-lcd_write_yuv420_lines