C++ reset_timer_masked函数代码示例

/*-----------------------------------------------------------------------
 * Write a word or halfword to Flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 */
static int
write_data(flash_info_t * info, ulong dest, FPW data)
{
	FPWV *addr = (FPWV *) dest;
	ulong status;
	int flag;

	/* Check if Flash is (sufficiently) erased */
	if ((*addr & data) != data) {
		printf("not erased at %08lX (%lX)\n", (ulong) addr, *addr);
		return (2);
	}
	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts();

	*addr = (FPW) 0x00400040;	/* write setup */
	*addr = data;

	/* arm simple, non interrupt dependent timer */
	reset_timer_masked();

	/* wait while polling the status register */
	while (((status = *addr) & (FPW) 0x00800080) != (FPW) 0x00800080) {
		if (get_timer_masked() > CONFIG_SYS_FLASH_WRITE_TOUT) {
			*addr = (FPW) 0x00FF00FF;	/* restore read mode */
			return (1);
		}
	}

	*addr = (FPW) 0x00FF00FF;	/* restore read mode */

	return (0);
}

int timer_init (void)
{
	/*
	 * Set clock frequency in the system controller:
	 *	VERSATILE_REFCLK is 32KHz
	 *	VERSATILE_TIMCLK is 1MHz
	 */
	*(volatile unsigned int *)(VERSATILE_SCTL_BASE) |=
		((VERSATILE_TIMCLK << VERSATILE_TIMER1_EnSel) | (VERSATILE_TIMCLK << VERSATILE_TIMER2_EnSel) |
		 (VERSATILE_TIMCLK << VERSATILE_TIMER3_EnSel) | (VERSATILE_TIMCLK << VERSATILE_TIMER4_EnSel));
	/*
	 * Now setup timer0
	 */
	*(volatile ulong *)(CONFIG_SYS_TIMERBASE + 0) = CONFIG_SYS_TIMER_RELOAD;	/* TimerLoad */
	*(volatile ulong *)(CONFIG_SYS_TIMERBASE + 4) = CONFIG_SYS_TIMER_RELOAD;	/* TimerValue */
	*(volatile ulong *)(CONFIG_SYS_TIMERBASE + 8) |= 0x82;			/* Enabled,
									 * free running,
									 * no interrupt,
									 * 32-bit,
									 * wrapping
									 */
	reset_timer_masked();

	return 0;
}

void udelay (unsigned long usec)
{
	ulong tmo,tmp;

	/* normalize */
	if (usec >= 1000) {
		tmo = usec / 1000;
		tmo *= CFG_HZ;
		tmo /= 1000;
	}
	else {
		if (usec > 1) {
			tmo = usec * CFG_HZ;
			tmo /= (1000*1000);
		}
		else
			tmo = 1;
	}

	/* check for rollover during this delay */
	tmp = get_timer (0);
	if ((tmp + tmo) < tmp )
		reset_timer_masked();  /* timer would roll over */
	else
		tmo += tmp;

	while (get_timer_masked () < tmo);
}

/*------------------------------------------------------------------------------
 * u-boot timer interface
 */
int timer_init(void)
{
	if (g_inittimer)
		return 0;

	NX_TIMER_SetClockDivisorEnable(CFG_TIMER_SYS_TICK_CH, CFALSE);
	NX_TIMER_SetClockSource(CFG_TIMER_SYS_TICK_CH, 0, CFG_TIMER_SYS_TICK_CLKSRC);
	NX_TIMER_SetClockDivisor(CFG_TIMER_SYS_TICK_CH, 0, CFG_TIMER_SYS_TICK_CLKDIV);
	NX_TIMER_SetClockPClkMode(CFG_TIMER_SYS_TICK_CH, NX_PCLKMODE_ALWAYS);
	NX_TIMER_SetClockDivisorEnable(CFG_TIMER_SYS_TICK_CH, CTRUE);
	NX_TIMER_Stop(CFG_TIMER_SYS_TICK_CH);

	NX_TIMER_SetWatchDogEnable(CFG_TIMER_SYS_TICK_CH, CFALSE);
	NX_TIMER_SetInterruptEnableAll(CFG_TIMER_SYS_TICK_CH, CFALSE);
	NX_TIMER_ClearInterruptPendingAll(CFG_TIMER_SYS_TICK_CH);

	NX_TIMER_SetTClkDivider(CFG_TIMER_SYS_TICK_CH, NX_TIMER_CLOCK_TCLK);
	NX_TIMER_SetTimerCounter(CFG_TIMER_SYS_TICK_CH, 0);
	NX_TIMER_SetMatchCounter(CFG_TIMER_SYS_TICK_CH, CFG_TIMER_SYS_TICK_CLKFREQ);
	NX_TIMER_Run(CFG_TIMER_SYS_TICK_CH);

	reset_timer_masked();

	g_inittimer = 1;
	return 0;
}

/*-----------------------------------------------------------------------
 * Write a byte to Flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 */
static int write_byte(flash_info_t *info, ulong dest, uchar data)
{
	vu_char *caddr = (vu_char *)(info->start[0]);
	int flag;

	/* Check if Flash is (sufficiently) erased */
	if ((*((vu_char *) dest) & data) != data) {
		return (ERR_NOT_ERASED);
	}

	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts();

	caddr[0xAAA] = 0xAA;
	caddr[0x555] = 0x55;
	caddr[0xAAA] = 0xA0;

	*((vu_char *)dest) = data;

	/* re-enable interrupts if necessary */
	if (flag)
		enable_interrupts();

	/* data polling for D7 */
	reset_timer_masked();
	while ((*((vu_char *)dest) & 0x80) != (data & 0x80)) {
		if (get_timer_masked() > CFG_FLASH_WRITE_TOUT) {
			return (ERR_TIMOUT);
		}
	}

	return (ERR_OK);
}

static int reset_eth (void)
{
	int pt;

	na_get_mac_addr ();
	pt = na_mii_identify_phy ();

	/* reset the phy */
	na_mii_write (MII_PHY_CONTROL, 0x8000);
	reset_timer_masked ();
	while (get_timer_masked () < NA_MII_NEGOTIATE_DELAY) {
		if ((na_mii_read (MII_PHY_STATUS) & 0x8000) == 0) {
			break;
		}
	}
	if (get_timer_masked () >= NA_MII_NEGOTIATE_DELAY)
		printf ("phy reset timeout\n");

	/* set the PCS reg */
	SET_EADDR (NETARM_ETH_PCS_CFG, NETARM_ETH_PCSC_CLKS_25M |
		   NETARM_ETH_PCSC_ENJAB | NETARM_ETH_PCSC_NOCFR);

	na_mii_negotiate ();
	na_mii_check_speed ();

	/* Delay 10 millisecond.  (Maybe this should be 1 second.) */
	udelay (10000);

	/* Turn receive on.
	   Enable statistics register autozero on read.
	   Do not insert MAC address on transmit.
	   Do not enable special test modes.  */
	SET_EADDR (NETARM_ETH_STL_CFG,
		   (NETARM_ETH_STLC_AUTOZ | NETARM_ETH_STLC_RXEN));

	/* Set the inter-packet gap delay to 0.96us for MII.
	   The NET+ARM H/W Reference Guide indicates that the Back-to-back IPG
	   Gap Timer Register should be set to 0x15 and the Non Back-to-back IPG
	   Gap Timer Register should be set to 0x00000C12 for the MII PHY. */
	SET_EADDR (NETARM_ETH_B2B_IPG_GAP_TMR, 0x15);
	SET_EADDR (NETARM_ETH_NB2B_IPG_GAP_TMR, 0x00000C12);

	/* Add CRC to end of packets.
	   Pad packets to minimum length of 64 bytes.
	   Allow unlimited length transmit packets.
	   Receive all broadcast packets.
	   NOTE:  Multicast addressing is NOT enabled here currently. */
	SET_EADDR (NETARM_ETH_MAC_CFG,
		   (NETARM_ETH_MACC_CRCEN |
		    NETARM_ETH_MACC_PADEN | NETARM_ETH_MACC_HUGEN));
	SET_EADDR (NETARM_ETH_SAL_FILTER, NETARM_ETH_SALF_BROAD);

	/* enable fifos */
	SET_EADDR (NETARM_ETH_GEN_CTRL,
		   (NETARM_ETH_GCR_ERX | NETARM_ETH_GCR_ETX));

	return (0);
}

int interrupt_init(void)
{
	/* start the counter ticking up, reload value on overflow */
	writel(TIMER_LOAD_VAL, &timer_base->tldr);
	/* enable timer */
	writel((CONFIG_SYS_PTV << 2) | TCLR_PRE | TCLR_AR | TCLR_ST,
		&timer_base->tclr);

	reset_timer_masked();	/* init the timestamp and lastinc value */

	return 0;
}

static int na_mii_poll_busy (void)
{
	/* arm simple, non interrupt dependent timer */
	reset_timer_masked ();
	while (get_timer_masked () < NA_MII_POLL_BUSY_DELAY) {
		if (!(GET_EADDR (NETARM_ETH_MII_IND) & NETARM_ETH_MIII_BUSY)) {
			return 1;
		}
	}
	printf ("na_mii_busy timeout\n");
	return (0);
}

/* nothing really to do with interrupts, just starts up a counter. */
int timer_init (void)
{
	/* Start the decrementer ticking down from 0xffffffff */
	__raw_writel(TIMER_LOAD_VAL, CONFIG_SYS_TIMERBASE + LOAD_TIM);
	__raw_writel(MPUTIM_ST | MPUTIM_AR | MPUTIM_CLOCK_ENABLE |
		(CONFIG_SYS_PTV << MPUTIM_PTV_BIT),
		CONFIG_SYS_TIMERBASE + CNTL_TIMER);

	/* init the timestamp and lastdec value */
	reset_timer_masked();

	return 0;
}

void udelay_masked (unsigned long usec)
{
	ulong tmo;

	tmo = usec / 1000;
	tmo *= CFG_HZ;
	tmo /= 1000;

	reset_timer_masked ();

	while (get_timer_masked () < tmo)
		/*NOP*/;
}

int interrupt_init (void)
{
	int i;
	/* setup GP Timer 1 */
	TCTL1 = TCTL_SWR;
	for ( i=0; i<100; i++) TCTL1 = 0; /* We have no udelay by now */
	TPRER1 = get_PERCLK1() / 1000000; /* 1 MHz */
	TCTL1 |= TCTL_FRR | (1<<1); /* Freerun Mode, PERCLK1 input */

	reset_timer_masked();

	return (0);
}

/* nothing really to do with interrupts, just starts up a counter. */
int interrupt_init (void)
{
	int32_t val;

	/* Start the counter ticking up */
	*((int32_t *) (CONFIG_SYS_TIMERBASE + TLDR)) = TIMER_LOAD_VAL;	/* reload value on overflow*/
	val = (CONFIG_SYS_PTV << 2) | BIT5 | BIT1 | BIT0;		/* mask to enable timer*/
	*((int32_t *) (CONFIG_SYS_TIMERBASE + TCLR)) = val;	/* start timer */

	reset_timer_masked(); /* init the timestamp and lastinc value */

	return(0);
}

int timer_init (void)
{
	int32_t val;

	/* Start the decrementer ticking down from 0xffffffff */
	*((int32_t *) (CONFIG_SYS_TIMERBASE + LOAD_TIM)) = TIMER_LOAD_VAL;
	val = MPUTIM_ST | MPUTIM_AR | MPUTIM_CLOCK_ENABLE | (CONFIG_SYS_PTV << MPUTIM_PTV_BIT);
	*((int32_t *) (CONFIG_SYS_TIMERBASE + CNTL_TIMER)) = val;

	/* init the timestamp and lastdec value */
	reset_timer_masked();

	return 0;
}

int timer_init(void)
{
	unsigned int oscc;
	unsigned int cr;

	debug("%s()\n", __func__);

	/* disable timers */
	writel(0, &tmr->cr);

	/*
	 * use 32768Hz oscillator for RTC, WDT, TIMER
	 */

	/* enable the 32768Hz oscillator */
	oscc = readl(&pmu->OSCC);
	oscc &= ~(FTPMU010_OSCC_OSCL_OFF | FTPMU010_OSCC_OSCL_TRI);
	writel(oscc, &pmu->OSCC);

	/* wait until ready */
	while (!(readl(&pmu->OSCC) & FTPMU010_OSCC_OSCL_STABLE))
		;

	/* select 32768Hz oscillator */
	oscc = readl(&pmu->OSCC);
	oscc |= FTPMU010_OSCC_OSCL_RTCLSEL;
	writel(oscc, &pmu->OSCC);

	/* setup timer */
	writel(TIMER_LOAD_VAL, &tmr->timer3_load);
	writel(TIMER_LOAD_VAL, &tmr->timer3_counter);
	writel(0, &tmr->timer3_match1);
	writel(0, &tmr->timer3_match2);

	/* we don't want timer to issue interrupts */
	writel(FTTMR010_TM3_MATCH1 |
	       FTTMR010_TM3_MATCH2 |
	       FTTMR010_TM3_OVERFLOW,
	       &tmr->interrupt_mask);

	cr = readl(&tmr->cr);
	cr |= FTTMR010_TM3_CLOCK;	/* use external clock */
	cr |= FTTMR010_TM3_ENABLE;
	writel(cr, &tmr->cr);

	/* init the timestamp and lastdec value */
	reset_timer_masked();

	return 0;
}

/*
 * Start the timer
 */
int timer_init(void)
{
	/*
	 * Setup timer0
	 */
	writel(SYSTIMER_RELOAD, &systimer_base->timer0load);
	writel(SYSTIMER_RELOAD, &systimer_base->timer0value);
	writel(SYSTIMER_EN | SYSTIMER_32BIT, &systimer_base->timer0control);

	reset_timer_masked();

	return 0;

}