diff options
Diffstat (limited to 'cpu/arm720t/interrupts.c')
| -rwxr-xr-x | cpu/arm720t/interrupts.c | 413 |
1 files changed, 413 insertions, 0 deletions
diff --git a/cpu/arm720t/interrupts.c b/cpu/arm720t/interrupts.c new file mode 100755 index 0000000..da62502 --- /dev/null +++ b/cpu/arm720t/interrupts.c @@ -0,0 +1,413 @@ +/* + * (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) +#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 +/* enable IRQ/FIQ interrupts */ +void enable_interrupts (void) +{ + unsigned long temp; + __asm__ __volatile__("mrs %0, cpsr\n" + "bic %0, %0, #0x80\n" + "msr cpsr_c, %0" + : "=r" (temp) + : + : "memory"); +} + + +/* + * disable IRQ/FIQ interrupts + * returns true if interrupts had been enabled before we disabled them + */ +int disable_interrupts (void) +{ + unsigned long old,temp; + __asm__ __volatile__("mrs %0, cpsr\n" + "orr %1, %0, #0x80\n" + "msr cpsr_c, %1" + : "=r" (old), "=r" (temp) + : + : "memory"); + return (old & 0x80) == 0; +} +#else /* CONFIG_USE_IRQ */ +void enable_interrupts (void) +{ + return; +} +int disable_interrupts (void) +{ + return 0; +} +#endif + +void bad_mode (void) +{ + panic ("Resetting CPU ...\n"); + reset_cpu (0); +} + +void show_regs (struct pt_regs *regs) +{ + unsigned long flags; + const char *processor_modes[] = + { "USER_26", "FIQ_26", "IRQ_26", "SVC_26", "UK4_26", "UK5_26", +"UK6_26", "UK7_26", + "UK8_26", "UK9_26", "UK10_26", "UK11_26", "UK12_26", "UK13_26", + "UK14_26", "UK15_26", + "USER_32", "FIQ_32", "IRQ_32", "SVC_32", "UK4_32", "UK5_32", + "UK6_32", "ABT_32", + "UK8_32", "UK9_32", "UK10_32", "UND_32", "UK12_32", "UK13_32", + "UK14_32", "SYS_32" + }; + + flags = condition_codes (regs); + + printf ("pc : [<%08lx>] lr : [<%08lx>]\n" + "sp : %08lx ip : %08lx fp : %08lx\n", + instruction_pointer (regs), + regs->ARM_lr, regs->ARM_sp, regs->ARM_ip, regs->ARM_fp); + printf ("r10: %08lx r9 : %08lx r8 : %08lx\n", + regs->ARM_r10, regs->ARM_r9, regs->ARM_r8); + printf ("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n", + regs->ARM_r7, regs->ARM_r6, regs->ARM_r5, regs->ARM_r4); + printf ("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n", + regs->ARM_r3, regs->ARM_r2, regs->ARM_r1, regs->ARM_r0); + printf ("Flags: %c%c%c%c", + flags & CC_N_BIT ? 'N' : 'n', + flags & CC_Z_BIT ? 'Z' : 'z', + flags & CC_C_BIT ? 'C' : 'c', flags & CC_V_BIT ? 'V' : 'v'); + printf (" IRQs %s FIQs %s Mode %s%s\n", + interrupts_enabled (regs) ? "on" : "off", + fast_interrupts_enabled (regs) ? "on" : "off", + processor_modes[processor_mode (regs)], + thumb_mode (regs) ? " (T)" : ""); +} + +void do_undefined_instruction (struct pt_regs *pt_regs) +{ + printf ("undefined instruction\n"); + show_regs (pt_regs); + bad_mode (); +} + +void do_software_interrupt (struct pt_regs *pt_regs) +{ + printf ("software interrupt\n"); + show_regs (pt_regs); + bad_mode (); +} + +void do_prefetch_abort (struct pt_regs *pt_regs) +{ + printf ("prefetch abort\n"); + show_regs (pt_regs); + bad_mode (); +} + +void do_data_abort (struct pt_regs *pt_regs) +{ + printf ("data abort\n"); + show_regs (pt_regs); + bad_mode (); +} + +void do_not_used (struct pt_regs *pt_regs) +{ + printf ("not used\n"); + show_regs (pt_regs); + bad_mode (); +} + +void do_fiq (struct pt_regs *pt_regs) +{ + printf ("fast interrupt request\n"); + show_regs (pt_regs); + bad_mode (); +} + +void do_irq (struct pt_regs *pt_regs) +{ +#if defined(CONFIG_IMPA7) || defined(CONFIG_EP7312) || defined(CONFIG_NETARM) || defined(CONFIG_ARMADILLO) + printf ("interrupt request\n"); + show_regs (pt_regs); + bad_mode (); +#elif 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 */ +#else +#error do_irq() not defined for this CPU type +#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 % (CFG_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; + +int interrupt_init (void) +{ + +#if defined(CONFIG_NETARM) + /* disable all interrupts */ + IRQEN = 0; + + /* operate timer 2 in non-prescale mode */ + TM2CTRL = ( NETARM_GEN_TIMER_SET_HZ(CFG_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) + 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 *)×tamp; + IRQ_HANDLER[INT_TIMER0].m_func = timer_isr; + + /* 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 = CFG_SYS_CLK_FREQ/CFG_HZ + */ + PUT_REG( REG_TDATA0, (CFG_SYS_CLK_FREQ / CFG_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); + +#else +#error No interrupt_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) + +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 *= CFG_HZ; + tmo /= 1000; + + tmo += get_timer (0); + + while (get_timer_masked () < tmo) + /*NOP*/; +} + +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 *= CFG_HZ; + tmo /= 1000; + } else { + tmo = usec * CFG_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 * CFG_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 |