cpu/arm720t/interrupts.c - uboot/prism - Git at Google

 /*
  * (C) Copyright 2002
  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
  * Marius Groeger <mgroeger@sysgo.de>
  *
  * (C) Copyright 2002
  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
  * Alex Zuepke <azu@sysgo.de>
  *
  * See file CREDITS for list of people who contributed to this
  * project.
  *
  * 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 program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  * MA 02111-1307 USA
  */

 #include <common.h>
 #include <clps7111.h>
 #include <asm/proc-armv/ptrace.h>
 #include <asm/hardware.h>

 #ifndef CONFIG_NETARM
 /* we always count down the max. */
 #define TIMER_LOAD_VAL 0xffff
 /* macro to read the 16 bit timer */
 #define READ_TIMER (IO_TC1D & 0xffff)

 #ifdef CONFIG_LPC2292
 #undef READ_TIMER
 #define READ_TIMER (0xFFFFFFFF - GET32(T0TC))
 #endif

 #else
 #define IRQEN	(*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_INTR_ENABLE))
 #define TM2CTRL (*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_TIMER2_CONTROL))
 #define TM2STAT (*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_TIMER2_STATUS))
 #define TIMER_LOAD_VAL NETARM_GEN_TSTAT_CTC_MASK
 #define READ_TIMER (TM2STAT & NETARM_GEN_TSTAT_CTC_MASK)
 #endif

 #ifdef CONFIG_S3C4510B
 /* require interrupts for the S3C4510B */
 # ifndef CONFIG_USE_IRQ
 #  error CONFIG_USE_IRQ _must_ be defined when using CONFIG_S3C4510B
 # else
 static struct _irq_handler IRQ_HANDLER[N_IRQS];
 # endif
 #endif	/* CONFIG_S3C4510B */

 #ifdef CONFIG_USE_IRQ
 void do_irq (struct pt_regs *pt_regs)
 {
 #if defined(CONFIG_S3C4510B)
 	unsigned int pending;

 	while ( (pending = GET_REG( REG_INTOFFSET)) != 0x54) {  /* sentinal value for no pending interrutps */
 		IRQ_HANDLER[pending>>2].m_func( IRQ_HANDLER[pending>>2].m_data);

 		/* clear pending interrupt */
 		PUT_REG( REG_INTPEND, (1<<(pending>>2)));
 	}
 #elif defined(CONFIG_INTEGRATOR) && defined(CONFIG_ARCH_INTEGRATOR)
 	/* No do_irq() for IntegratorAP/CM720T as yet */
 #elif defined(CONFIG_LPC2292)

     void (*pfnct)(void);

     pfnct = (void (*)(void))VICVectAddr;

     (*pfnct)();
 #else
 #error do_irq() not defined for this CPU type
 #endif
 }
 #endif

 #ifdef CONFIG_S3C4510B
 static void default_isr( void *data) {
 	printf ("default_isr():  called for IRQ %d\n", (int)data);
 }

 static void timer_isr( void *data) {
 	unsigned int *pTime = (unsigned int *)data;

 	(*pTime)++;
 	if ( !(*pTime % (CONFIG_SYS_HZ/4))) {
 		/* toggle LED 0 */
 		PUT_REG( REG_IOPDATA, GET_REG(REG_IOPDATA) ^ 0x1);
 	}

 }
 #endif

 #if defined(CONFIG_INTEGRATOR) && defined(CONFIG_ARCH_INTEGRATOR)
 	/* Use IntegratorAP routines in board/integratorap.c */
 #else

 static ulong timestamp;
 static ulong lastdec;

 #if defined(CONFIG_USE_IRQ) && defined(CONFIG_S3C4510B)
 int arch_interrupt_init (void)
 {
 	int i;

 	/* install default interrupt handlers */
 	for ( i = 0; i < N_IRQS; i++) {
 		IRQ_HANDLER[i].m_data = (void *)i;
 		IRQ_HANDLER[i].m_func = default_isr;
 	}

 	/* configure interrupts for IRQ mode */
 	PUT_REG( REG_INTMODE, 0x0);
 	/* clear any pending interrupts */
 	PUT_REG( REG_INTPEND, 0x1FFFFF);

 	lastdec = 0;

 	/* install interrupt handler for timer */
 	IRQ_HANDLER[INT_TIMER0].m_data = (void *)&timestamp;
 	IRQ_HANDLER[INT_TIMER0].m_func = timer_isr;

 	return 0;
 }
 #endif

 int timer_init (void)
 {
 #if defined(CONFIG_NETARM)
 	/* disable all interrupts */
 	IRQEN = 0;

 	/* operate timer 2 in non-prescale mode */
 	TM2CTRL = ( NETARM_GEN_TIMER_SET_HZ(CONFIG_SYS_HZ) |
 		    NETARM_GEN_TCTL_ENABLE |
 		    NETARM_GEN_TCTL_INIT_COUNT(TIMER_LOAD_VAL));

 	/* set timer 2 counter */
 	lastdec = TIMER_LOAD_VAL;
 #elif defined(CONFIG_IMPA7) || defined(CONFIG_EP7312) || defined(CONFIG_ARMADILLO)
 	/* disable all interrupts */
 	IO_INTMR1 = 0;

 	/* operate timer 1 in prescale mode */
 	IO_SYSCON1 |= SYSCON1_TC1M;

 	/* select 2kHz clock source for timer 1 */
 	IO_SYSCON1 &= ~SYSCON1_TC1S;

 	/* set timer 1 counter */
 	lastdec = IO_TC1D = TIMER_LOAD_VAL;
 #elif defined(CONFIG_S3C4510B)
 	/* configure free running timer 0 */
 	PUT_REG( REG_TMOD, 0x0);
 	/* Stop timer 0 */
 	CLR_REG( REG_TMOD, TM0_RUN);

 	/* Configure for interval mode */
 	CLR_REG( REG_TMOD, TM1_TOGGLE);

 	/*
 	 * Load Timer data register with count down value.
 	 * count_down_val = CONFIG_SYS_SYS_CLK_FREQ/CONFIG_SYS_HZ
 	 */
 	PUT_REG( REG_TDATA0, (CONFIG_SYS_SYS_CLK_FREQ / CONFIG_SYS_HZ));

 	/*
 	 * Enable global interrupt
 	 * Enable timer0 interrupt
 	 */
 	CLR_REG( REG_INTMASK, ((1<<INT_GLOBAL) | (1<<INT_TIMER0)));

 	/* Start timer */
 	SET_REG( REG_TMOD, TM0_RUN);
 #elif defined(CONFIG_LPC2292)
 	PUT32(T0IR, 0);		/* disable all timer0 interrupts */
 	PUT32(T0TCR, 0);	/* disable timer0 */
 	PUT32(T0PR, CONFIG_SYS_SYS_CLK_FREQ / CONFIG_SYS_HZ);
 	PUT32(T0MCR, 0);
 	PUT32(T0TC, 0);
 	PUT32(T0TCR, 1);	/* enable timer0 */

 #else
 #error No timer_init() defined for this CPU type
 #endif
 	timestamp = 0;

 	return (0);
 }

 #endif /* ! IntegratorAP */

 /*
  * timer without interrupts
  */


 #if defined(CONFIG_IMPA7) || defined(CONFIG_EP7312) || defined(CONFIG_NETARM) || defined(CONFIG_ARMADILLO) || defined(CONFIG_LPC2292)

 void reset_timer (void)
 {
 	reset_timer_masked ();
 }

 ulong get_timer (ulong base)
 {
 	return get_timer_masked () - base;
 }

 void set_timer (ulong t)
 {
 	timestamp = t;
 }

 void udelay (unsigned long usec)
 {
 	ulong tmo;

 	tmo = usec / 1000;
 	tmo *= CONFIG_SYS_HZ;
 	tmo /= 1000;

 	tmo += get_timer (0);

 	while (get_timer_masked () < tmo)
 #ifdef CONFIG_LPC2292
 		/* GJ - not sure whether this is really needed or a misunderstanding */
 		__asm__ __volatile__(" nop");
 #else
 		/*NOP*/;
 #endif
 }

 void reset_timer_masked (void)
 {
 	/* reset time */
 	lastdec = READ_TIMER;
 	timestamp = 0;
 }

 ulong get_timer_masked (void)
 {
 	ulong now = READ_TIMER;

 	if (lastdec >= now) {
 		/* normal mode */
 		timestamp += lastdec - now;
 	} else {
 		/* we have an overflow ... */
 		timestamp += lastdec + TIMER_LOAD_VAL - now;
 	}
 	lastdec = now;

 	return timestamp;
 }

 void udelay_masked (unsigned long usec)
 {
 	ulong tmo;
 	ulong endtime;
 	signed long diff;

 	if (usec >= 1000) {
 		tmo = usec / 1000;
 		tmo *= CONFIG_SYS_HZ;
 		tmo /= 1000;
 	} else {
 		tmo = usec * CONFIG_SYS_HZ;
 		tmo /= (1000*1000);
 	}

 	endtime = get_timer_masked () + tmo;

 	do {
 		ulong now = get_timer_masked ();
 		diff = endtime - now;
 	} while (diff >= 0);
 }

 #elif defined(CONFIG_S3C4510B)

 ulong get_timer (ulong base)
 {
 	return timestamp - base;
 }

 void udelay (unsigned long usec)
 {
 	u32 ticks;

 	ticks = (usec * CONFIG_SYS_HZ) / 1000000;

 	ticks += get_timer (0);

 	while (get_timer (0) < ticks)
 		/*NOP*/;

 }

 #elif defined(CONFIG_INTEGRATOR) && defined(CONFIG_ARCH_INTEGRATOR)
 	/* No timer routines for IntegratorAP/CM720T as yet */
 #else
 #error Timer routines not defined for this CPU type
 #endif
	/*
	* (C) Copyright 2002
	* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
	* Marius Groeger <mgroeger@sysgo.de>
	*
	* (C) Copyright 2002
	* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
	* Alex Zuepke <azu@sysgo.de>
	*
	* See file CREDITS for list of people who contributed to this
	* project.
	*
	* 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 program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	* MA 02111-1307 USA
	*/

	#include <common.h>
	#include <clps7111.h>
	#include <asm/proc-armv/ptrace.h>
	#include <asm/hardware.h>

	#ifndef CONFIG_NETARM
	/* we always count down the max. */
	#define TIMER_LOAD_VAL 0xffff
	/* macro to read the 16 bit timer */
	#define READ_TIMER (IO_TC1D & 0xffff)

	#ifdef CONFIG_LPC2292
	#undef READ_TIMER
	#define READ_TIMER (0xFFFFFFFF - GET32(T0TC))
	#endif

	#else
	#define IRQEN ((volatile unsigned int )(NETARM_GEN_MODULE_BASE + NETARM_GEN_INTR_ENABLE))
	#define TM2CTRL ((volatile unsigned int )(NETARM_GEN_MODULE_BASE + NETARM_GEN_TIMER2_CONTROL))
	#define TM2STAT ((volatile unsigned int )(NETARM_GEN_MODULE_BASE + NETARM_GEN_TIMER2_STATUS))
	#define TIMER_LOAD_VAL NETARM_GEN_TSTAT_CTC_MASK
	#define READ_TIMER (TM2STAT & NETARM_GEN_TSTAT_CTC_MASK)
	#endif

	#ifdef CONFIG_S3C4510B
	/* require interrupts for the S3C4510B */
	# ifndef CONFIG_USE_IRQ
	# error CONFIG_USE_IRQ _must_ be defined when using CONFIG_S3C4510B
	# else
	static struct _irq_handler IRQ_HANDLER[N_IRQS];
	# endif
	#endif /* CONFIG_S3C4510B */

	#ifdef CONFIG_USE_IRQ
	void do_irq (struct pt_regs *pt_regs)
	{
	#if defined(CONFIG_S3C4510B)
	unsigned int pending;

	while ( (pending = GET_REG( REG_INTOFFSET)) != 0x54) { /* sentinal value for no pending interrutps */
	IRQ_HANDLER[pending>>2].m_func( IRQ_HANDLER[pending>>2].m_data);

	/* clear pending interrupt */
	PUT_REG( REG_INTPEND, (1<<(pending>>2)));
	}
	#elif defined(CONFIG_INTEGRATOR) && defined(CONFIG_ARCH_INTEGRATOR)
	/* No do_irq() for IntegratorAP/CM720T as yet */
	#elif defined(CONFIG_LPC2292)

	void (*pfnct)(void);

	pfnct = (void (*)(void))VICVectAddr;

	(*pfnct)();
	#else
	#error do_irq() not defined for this CPU type
	#endif
	}
	#endif

	#ifdef CONFIG_S3C4510B
	static void default_isr( void *data) {
	printf ("default_isr(): called for IRQ %d\n", (int)data);
	}

	static void timer_isr( void *data) {
	unsigned int pTime = (unsigned int )data;

	(*pTime)++;
	if ( !(*pTime % (CONFIG_SYS_HZ/4))) {
	/* toggle LED 0 */
	PUT_REG( REG_IOPDATA, GET_REG(REG_IOPDATA) ^ 0x1);
	}

	}
	#endif

	#if defined(CONFIG_INTEGRATOR) && defined(CONFIG_ARCH_INTEGRATOR)
	/* Use IntegratorAP routines in board/integratorap.c */
	#else

	static ulong timestamp;
	static ulong lastdec;

	#if defined(CONFIG_USE_IRQ) && defined(CONFIG_S3C4510B)
	int arch_interrupt_init (void)
	{
	int i;

	/* install default interrupt handlers */
	for ( i = 0; i < N_IRQS; i++) {
	IRQ_HANDLER[i].m_data = (void *)i;
	IRQ_HANDLER[i].m_func = default_isr;
	}

	/* configure interrupts for IRQ mode */
	PUT_REG( REG_INTMODE, 0x0);
	/* clear any pending interrupts */
	PUT_REG( REG_INTPEND, 0x1FFFFF);

	lastdec = 0;

	/* install interrupt handler for timer */
	IRQ_HANDLER[INT_TIMER0].m_data = (void *)&timestamp;
	IRQ_HANDLER[INT_TIMER0].m_func = timer_isr;

	return 0;
	}
	#endif

	int timer_init (void)
	{
	#if defined(CONFIG_NETARM)
	/* disable all interrupts */
	IRQEN = 0;

	/* operate timer 2 in non-prescale mode */
	TM2CTRL = ( NETARM_GEN_TIMER_SET_HZ(CONFIG_SYS_HZ) \|
	NETARM_GEN_TCTL_ENABLE \|
	NETARM_GEN_TCTL_INIT_COUNT(TIMER_LOAD_VAL));

	/* set timer 2 counter */
	lastdec = TIMER_LOAD_VAL;
	#elif defined(CONFIG_IMPA7) \|\| defined(CONFIG_EP7312) \|\| defined(CONFIG_ARMADILLO)
	/* disable all interrupts */
	IO_INTMR1 = 0;

	/* operate timer 1 in prescale mode */
	IO_SYSCON1 \|= SYSCON1_TC1M;

	/* select 2kHz clock source for timer 1 */
	IO_SYSCON1 &= ~SYSCON1_TC1S;

	/* set timer 1 counter */
	lastdec = IO_TC1D = TIMER_LOAD_VAL;
	#elif defined(CONFIG_S3C4510B)
	/* configure free running timer 0 */
	PUT_REG( REG_TMOD, 0x0);
	/* Stop timer 0 */
	CLR_REG( REG_TMOD, TM0_RUN);

	/* Configure for interval mode */
	CLR_REG( REG_TMOD, TM1_TOGGLE);

	/*
	* Load Timer data register with count down value.
	* count_down_val = CONFIG_SYS_SYS_CLK_FREQ/CONFIG_SYS_HZ
	*/
	PUT_REG( REG_TDATA0, (CONFIG_SYS_SYS_CLK_FREQ / CONFIG_SYS_HZ));

	/*
	* Enable global interrupt
	* Enable timer0 interrupt
	*/
	CLR_REG( REG_INTMASK, ((1<<INT_GLOBAL) \| (1<<INT_TIMER0)));

	/* Start timer */
	SET_REG( REG_TMOD, TM0_RUN);
	#elif defined(CONFIG_LPC2292)
	PUT32(T0IR, 0); /* disable all timer0 interrupts */
	PUT32(T0TCR, 0); /* disable timer0 */
	PUT32(T0PR, CONFIG_SYS_SYS_CLK_FREQ / CONFIG_SYS_HZ);
	PUT32(T0MCR, 0);
	PUT32(T0TC, 0);
	PUT32(T0TCR, 1); /* enable timer0 */

	#else
	#error No timer_init() defined for this CPU type
	#endif
	timestamp = 0;

	return (0);
	}

	#endif /* ! IntegratorAP */

	/*
	* timer without interrupts
	*/


	#if defined(CONFIG_IMPA7) \|\| defined(CONFIG_EP7312) \|\| defined(CONFIG_NETARM) \|\| defined(CONFIG_ARMADILLO) \|\| defined(CONFIG_LPC2292)

	void reset_timer (void)
	{
	reset_timer_masked ();
	}

	ulong get_timer (ulong base)
	{
	return get_timer_masked () - base;
	}

	void set_timer (ulong t)
	{
	timestamp = t;
	}

	void udelay (unsigned long usec)
	{
	ulong tmo;

	tmo = usec / 1000;
	tmo *= CONFIG_SYS_HZ;
	tmo /= 1000;

	tmo += get_timer (0);

	while (get_timer_masked () < tmo)
	#ifdef CONFIG_LPC2292
	/* GJ - not sure whether this is really needed or a misunderstanding */
	__asm__ __volatile__(" nop");
	#else
	/NOP/;
	#endif
	}

	void reset_timer_masked (void)
	{
	/* reset time */
	lastdec = READ_TIMER;
	timestamp = 0;
	}

	ulong get_timer_masked (void)
	{
	ulong now = READ_TIMER;

	if (lastdec >= now) {
	/* normal mode */
	timestamp += lastdec - now;
	} else {
	/* we have an overflow ... */
	timestamp += lastdec + TIMER_LOAD_VAL - now;
	}
	lastdec = now;

	return timestamp;
	}

	void udelay_masked (unsigned long usec)
	{
	ulong tmo;
	ulong endtime;
	signed long diff;

	if (usec >= 1000) {
	tmo = usec / 1000;
	tmo *= CONFIG_SYS_HZ;
	tmo /= 1000;
	} else {
	tmo = usec * CONFIG_SYS_HZ;
	tmo /= (1000*1000);
	}

	endtime = get_timer_masked () + tmo;

	do {
	ulong now = get_timer_masked ();
	diff = endtime - now;
	} while (diff >= 0);
	}

	#elif defined(CONFIG_S3C4510B)

	ulong get_timer (ulong base)
	{
	return timestamp - base;
	}

	void udelay (unsigned long usec)
	{
	u32 ticks;

	ticks = (usec * CONFIG_SYS_HZ) / 1000000;

	ticks += get_timer (0);

	while (get_timer (0) < ticks)
	/NOP/;

	}

	#elif defined(CONFIG_INTEGRATOR) && defined(CONFIG_ARCH_INTEGRATOR)
	/* No timer routines for IntegratorAP/CM720T as yet */
	#else
	#error Timer routines not defined for this CPU type
	#endif