/* * (C) Copyright 2006 * Stefan Roese, DENX Software Engineering, sr@denx.de. * * (C) Copyright 2002 * Sysgo Real-Time Solutions, GmbH * Marius Groeger * * (C) Copyright 2002 * Sysgo Real-Time Solutions, GmbH * Alex Zuepke * * 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 #include #ifdef CONFIG_USE_IRQ /* * When interrupts are enabled, use timer 2 for time/delay generation... */ #define FREQ 66666666 #define CLOCK_TICK_RATE (((FREQ / CFG_HZ & ~IXP425_OST_RELOAD_MASK) + 1) * CFG_HZ) #define LATCH ((CLOCK_TICK_RATE + CFG_HZ/2) / CFG_HZ) /* For divider */ struct _irq_handler { void *m_data; void (*m_func)( void *data); }; static struct _irq_handler IRQ_HANDLER[N_IRQS]; static volatile ulong timestamp; /* 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; } static void default_isr(void *data) { printf("default_isr(): called for IRQ %d, Interrupt Status=%x PR=%x\n", (int)data, *IXP425_ICIP, *IXP425_ICIH); } static int next_irq(void) { return (((*IXP425_ICIH & 0x000000fc) >> 2) - 1); } static void timer_isr(void *data) { unsigned int *pTime = (unsigned int *)data; (*pTime)++; /* * Reset IRQ source */ *IXP425_OSST = IXP425_OSST_TIMER_2_PEND; } ulong get_timer (ulong base) { return timestamp - base; } void reset_timer (void) { timestamp = 0; } #else /* #ifdef CONFIG_USE_IRQ */ void enable_interrupts (void) { return; } int disable_interrupts (void) { return 0; } #endif /* #ifdef CONFIG_USE_IRQ */ 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); printf("IRQ=%08lx FIQ=%08lx\n", *IXP425_ICIH, *IXP425_ICFH); } void do_irq (struct pt_regs *pt_regs) { #ifdef CONFIG_USE_IRQ int irq = next_irq(); IRQ_HANDLER[irq].m_func(IRQ_HANDLER[irq].m_data); #else printf ("interrupt request\n"); show_regs (pt_regs); bad_mode (); #endif } int interrupt_init (void) { #ifdef CONFIG_USE_IRQ 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; } /* install interrupt handler for timer */ IRQ_HANDLER[IXP425_TIMER_2_IRQ].m_data = (void *)×tamp; IRQ_HANDLER[IXP425_TIMER_2_IRQ].m_func = timer_isr; /* setup the Timer counter value */ *IXP425_OSRT2 = (LATCH & ~IXP425_OST_RELOAD_MASK) | IXP425_OST_ENABLE; /* configure interrupts for IRQ mode */ *IXP425_ICLR = 0x00000000; /* enable timer irq */ *IXP425_ICMR = (1 << IXP425_TIMER_2_IRQ); #endif return (0); }