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[picodrive.git] / platform / gp2x / code940 / 940.c

// The top-level functions for the ARM940\r
// (c) Copyright 2006-2007, Grazvydas "notaz" Ignotas\r
\r
#include "940shared.h"\r
\r
static _940_data_t *shared_data = (_940_data_t *)   0x00100000;\r
static _940_ctl_t  *shared_ctl  = (_940_ctl_t *)    0x00200000;\r
static unsigned char *mp3_data  = (unsigned char *) 0x00400000;\r
YM2612 *ym2612_940;\r
\r
// from init.s\r
int  wait_get_job(int oldjob);\r
void spend_cycles(int c);\r
void dcache_clean(void);\r
void dcache_clean_flush(void);\r
void drain_wb(void);\r
// this should help to resolve race confition where shared var\r
// is changed by other core just before we update it\r
void set_if_not_changed(int *val, int oldval, int newval);\r
\r
//	asm volatile ("mov r0, #0" ::: "r0");\r
//	asm volatile ("mcr p15, 0, r0, c7, c6,  0" ::: "r0"); /* flush dcache */\r
//	asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer */\r
\r
\r
static void mp3_decode(void)\r
{\r
	int mp3_offs = shared_ctl->mp3_offs;\r
	unsigned char *readPtr = mp3_data + mp3_offs;\r
	int bytesLeft = shared_ctl->mp3_len - mp3_offs;\r
	int offset; // frame offset from readPtr\r
	int err;\r
\r
	if (bytesLeft <= 0) return; // EOF, nothing to do\r
\r
	offset = MP3FindSyncWord(readPtr, bytesLeft);\r
	if (offset < 0) {\r
		set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, shared_ctl->mp3_len);\r
		return; // EOF\r
	}\r
	readPtr += offset;\r
	bytesLeft -= offset;\r
\r
	err = MP3Decode(shared_data->mp3dec, &readPtr, &bytesLeft,\r
			shared_data->mp3_buffer[shared_ctl->mp3_buffsel], 0);\r
	if (err) {\r
		if (err == ERR_MP3_INDATA_UNDERFLOW) {\r
			set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, shared_ctl->mp3_len);\r
			return;\r
		} else if (err <= -6 && err >= -12) {\r
			// ERR_MP3_INVALID_FRAMEHEADER, ERR_MP3_INVALID_*\r
			// just try to skip the offending frame..\r
			readPtr++;\r
		}\r
		shared_ctl->mp3_errors++;\r
		shared_ctl->mp3_lasterr = err;\r
	}\r
	set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, readPtr - mp3_data);\r
}\r
\r
static void ym_update(int *ym_buffer)\r
{\r
	int i, dw;\r
	int two_upds = 0;\r
	UINT16 *wbuff;\r
\r
	if (shared_ctl->writebuffsel == 1) {\r
		wbuff = shared_ctl->writebuff1;\r
	} else {\r
		wbuff = shared_ctl->writebuff0;\r
	}\r
\r
	/* playback all writes */\r
	for (i = 2048/2; i > 0; i--) {\r
		UINT16 d;\r
		dw = *(int *)wbuff;\r
		d = dw;\r
		wbuff++;\r
		if (d == 0xffff) break;\r
		if (d == 0xfffe) { two_upds=1; break; }\r
		YM2612Write_(d >> 8, d);\r
		d = (dw>>16);\r
		wbuff++;\r
		if (d == 0xffff) break;\r
		if (d == 0xfffe) { two_upds=1; break; }\r
		YM2612Write_(d >> 8, d);\r
	}\r
\r
	if (two_upds) {\r
		int len1 = shared_ctl->length / 2;\r
		shared_ctl->ym_active_chs =\r
			YM2612UpdateOne_(ym_buffer, len1, shared_ctl->stereo, 1);\r
\r
		for (i *= 2; i > 0; i--) {\r
			UINT16 d = *wbuff++;\r
			if (d == 0xffff) break;\r
			YM2612Write_(d >> 8, d);\r
		}\r
\r
		ym_buffer += shared_ctl->stereo ? len1*2 : len1;\r
		len1 = shared_ctl->length - len1;\r
\r
		shared_ctl->ym_active_chs =\r
			YM2612UpdateOne_(ym_buffer, len1, shared_ctl->stereo, 1);\r
	} else {\r
		shared_ctl->ym_active_chs =\r
			YM2612UpdateOne_(ym_buffer, shared_ctl->length, shared_ctl->stereo, 1);\r
	}\r
}\r
\r
\r
void Main940(void)\r
{\r
	int *ym_buffer = shared_data->ym_buffer;\r
	int job = 0;\r
	ym2612_940 = &shared_data->ym2612;\r
\r
\r
	for (;;)\r
	{\r
		job = wait_get_job(job);\r
\r
		shared_ctl->lastjob = job;\r
\r
		switch (job)\r
		{\r
			case JOB940_INITALL:\r
				/* ym2612 */\r
				shared_ctl->writebuff0[0] = shared_ctl->writebuff1[0] = 0xffff;\r
				YM2612Init_(shared_ctl->baseclock, shared_ctl->rate);\r
				/* Helix mp3 decoder */\r
				shared_data->mp3dec = MP3InitDecoder();\r
				break;\r
\r
			case JOB940_INVALIDATE_DCACHE:\r
				drain_wb();\r
				dcache_clean_flush();\r
				break;\r
\r
			case JOB940_YM2612RESETCHIP:\r
				YM2612ResetChip_();\r
				break;\r
\r
			case JOB940_PICOSTATELOAD:\r
				YM2612PicoStateLoad_();\r
				break;\r
\r
			case JOB940_YM2612UPDATEONE:\r
				ym_update(ym_buffer);\r
				break;\r
\r
			case JOB940_MP3DECODE:\r
				mp3_decode();\r
				break;\r
		}\r
\r
		shared_ctl->loopc++;\r
		dcache_clean();\r
	}\r
}\r
\r