fip.c

这是一个SIGMA方案的PMP播放器的UCLINUX程序,可播放DVD,VCD,CD MP3...有很好的参考价值.

#include "fip.h"
#include "fipuser_player.h"
#include "fip_private.h"
#include "fip_scancodes.h"

unsigned int fip_fifo[FIP_FIFO_SIZE];
unsigned int fip_fifo_first, fip_fifo_last;

static unsigned int fipkeyold;
static int fipkeyrepeat;
static int fipkeyerrors;

static int fip_busy()
{
// return the busy bit
	FIP_DELAY(10);
	return (((*FIP_TRISTATE_MODE_REG) & 0x2) == 0x2);
}

#ifndef FIP_NO_INTERRUPT
/*
 *  Push a scancode into the FIFO
 *  Called from interrupt.
 */
void fip_receive_scancode(unsigned long sc)
{
//		diag_printf("receive_scancode: sc= %08x\n",sc);
		
		if(FIP_FIFO_FULL()) {
				DPRINTF("receive_scancode: warning - FIFO full -loosing data\n");
		}
		FIP_FIFO_IN(sc);
		return;
}

/* Pop a scancode from the FIFO */	                                    
unsigned long fip_read_scancode(unsigned long timeout)
{
	unsigned int fipkeys = 0;

	FIP_FIFO_LOCK();
	if(!FIP_FIFO_EMPTY())
		goto fifo_out;
	if (timeout)
	{
		FIP_FIFO_UNLOCK(); // unlock and wait...
		FIP_FIFO_WAIT(timeout);   // and wait...
		FIP_FIFO_LOCK();
	}
	if(!FIP_FIFO_EMPTY())
		goto fifo_out;
	
	FIP_FIFO_UNLOCK();
	return 0;
	
fifo_out:		
	FIP_FIFO_OUT(&fipkeys);
	FIP_FIFO_UNLOCK();
	return fipkeys;
}

#endif /* !FIP_NO_INTERRUPT */
		
void fip_wait_ready()
{
	while(fip_busy());
}

#ifdef FIP_REVA
// Called by timer1 interrupt (fiq)
static unsigned fip_poll_revA(void)
{
	int pio1,i;
	unsigned int fipkeys;
	
	fip_wait_ready ();
	*FIP_COMMAND_REG = FIP_CMD_DATA_SET_RW_MODE_READ_KEYS;

	// clock in the data:	
	fipkeys=0;
	i=0;
	do {
		// wait for a rising edge
		do {
			pio1 = *PIO_1_DATA_REG;
		} while((pio1 & 0x100)==0);
		fipkeys |=  ((pio1 & 0x80) >> 7) << 31;
		fipkeys = fipkeys >> 1;
		// wait for the falling edge
		do {
			pio1 = *PIO_1_DATA_REG;
		} while((pio1 & 0x100));
		i++;		
	} while(i<40);  // ((fipkeys & SC_PANEL_MASK) != SC_PANEL_RELEASE) && (i<40)); // while the 4 msbs are not 0
	return fipkeys;
}
#endif /* FIP_REVA */

#ifdef FIP_REVB
static unsigned long fip_poll_revB(void)
{	
	fip_wait_ready ();
	*FIP_COMMAND_REG = FIP_CMD_DATA_SET_RW_MODE_READ_KEYS;
	return *FIP_KEY_DATA1_REG;       
}
#endif /* FIP_REVB */


#ifndef FIP_NO_INTERRUPT
// Called by timer1 interrupt (fiq)
// Timer interrupt is NOT cleared - it must be cleared before or after
int fip_timer(void)
{
	int rc=0;
	unsigned long fipkeys;
	
	if(fip_poll)
		fipkeys=fip_poll();
	else 
		return 0;

	if(fipkeys == 0xffffffff);
	else if(fipkeys != fipkeyold) {
		fip_receive_scancode(fipkeys);
		rc=1;
		fipkeyrepeat = 0;
	} else if(fipkeys != SC_PANEL_RELEASE) {
		fipkeyrepeat++;
		if(fipkeyrepeat == FIP_KEY_REPEAT) {
			fip_receive_scancode(fipkeys);
			rc=1;
			fipkeyrepeat = 0;
		}
	}
	fipkeyold = fipkeys;
	
	return rc;
}

#endif /* FIP_NO_INTERRUPT */


void fip_init(void)
{
	unsigned long dw;
	unsigned long rev;

	*(FIP_CLK_DIV_REG) = 40; // * 3;

	// select display mode
	*(FIP_COMMAND_REG) = FIP_DISPLAY_MODE; // XXX : What is that ?
	fip_wait_ready();

	// select brightness of display and turn it on
	*(FIP_COMMAND_REG) = FIP_CMD_DISP_CTRL_TURN_DISPLAY_ON | 0x7;
	fip_wait_ready();

	// select write to display and fixed addressing
	*(FIP_COMMAND_REG) = FIP_CMD_DATA_SET_ADR_MODE_FIXED_ADR;
	fip_wait_ready();

#ifdef FIP_FORCE_REV
    rev=FIP_FORCE_REV;
#else 
    rev =  *(SYS_REVID_REG);
#endif
    switch(rev) {
    case 0:
#ifdef FIP_REVA
	    DPRINTF("FIP USING REVA PIO method\n",40);
    	fip_poll=&fip_poll_revA;
#endif
		break;
	default:
#ifdef FIP_REVB
	    DPRINTF("FIP USING REVB NORMAL METHOD\n",40);
	    fip_poll=&fip_poll_revB;
#endif
		break;
	}
			
	
	fipkeyrepeat = 0;
	fipkeyold = SC_PANEL_RELEASE;

#ifdef FIP_REVA	
	if(rev=0) {
		// set PIO_1 bit 7&8 to be input
		dw  = (1<<7 | 1 <<8) << 16; 
		*(PIO_1_DIR_REG) = dw;
	}
#endif /* FIP_PIO */	

#ifndef FIP_NO_INTERRUPT
	// disable timer 1
	*(TIMER1_CNTL_REG) = 0x0000;
	// program the load register (148 * 160) = 23680 (assume system clock is 148Mhz)
	*(TIMER1_LOAD_REG) = FIP_TIMER_LOAD_VALUE;
	*(TIMER1_CNTL_REG) = FIP_TIMER_PRESCALE;
	 // enable timer
	*(TIMER1_CNTL_REG) = 0x90 | FIP_TIMER_PRESCALE;

	fip_fifo_first = 0;
	fip_fifo_last = 0;
	
#endif /* !FIP_NO_INTERRUPT */

}