initial import

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

#include "940shared.h"\r
\r
/* this code assumes that we live @ 0x3000000 bank */\r
//static volatile unsigned short *gp2x_memregs = (void *) 0x0xbd000000;\r
//static volatile unsigned long  *gp2x_memregl = (void *) 0x0xbd000000;\r
\r
static _940_data_t *shared_data = (_940_data_t *) 0x100000;\r
static _940_ctl_t  *shared_ctl  = (_940_ctl_t *)  0x200000;\r
YM2612 *ym2612_940;\r
int *mix_buffer;\r
\r
// from init.s\r
void wait_irq(void);\r
void spend_cycles(int c);\r
void cache_clean(void);\r
void cache_clean_flush(void);\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
void Main940(int startvector)\r
{\r
	ym2612_940 = &shared_data->ym2612;\r
	mix_buffer = shared_data->mix_buffer;\r
\r
	// debug\r
	shared_ctl->vstarts[startvector]++;\r
	asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0");\r
\r
	/* unmask IRQs */\r
\r
	for (;; shared_ctl->loopc++)\r
	{\r
/*\r
		while (!shared_ctl->busy)\r
		{\r
			//shared_ctl->waitc++;\r
			spend_cycles(256);\r
		}\r
*/\r
		if (!shared_ctl->busy)\r
		{\r
			wait_irq();\r
		}\r
\r
		switch (shared_ctl->job)\r
		{\r
			case JOB940_YM2612INIT:\r
				shared_ctl->writebuff0[0] = shared_ctl->writebuff1[0] = 0xffff;\r
				YM2612Init_(shared_ctl->baseclock, shared_ctl->rate);\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
				int i, dw, *wbuff;\r
				if (shared_ctl->writebuffsel == 1) {\r
					wbuff = (int *) shared_ctl->writebuff1;\r
				} else {\r
					wbuff = (int *) shared_ctl->writebuff0;\r
				}\r
\r
				/* playback all writes */\r
				for (i = 2048/2; i > 0; i--) {\r
					UINT16 d;\r
					dw = *wbuff++;\r
					d = dw;\r
					if (d == 0xffff) break;\r
					YM2612Write_(d >> 8, d);\r
					d = (dw>>16);\r
					if (d == 0xffff) break;\r
					YM2612Write_(d >> 8, d);\r
				}\r
\r
				YM2612UpdateOne_(0, shared_ctl->length, shared_ctl->stereo);\r
//				cache_clean_flush();\r
				cache_clean();\r
//				asm volatile ("mov r0, #0" ::: "r0");\r
//				asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer, should be done on nonbuffered write */\r
				break;\r
			}\r
		}\r
\r
		shared_ctl->busy = 0;\r
	}\r
}\r