/* * (C) Copyright 2003 * Texas Instruments * * (C) Copyright 2002 * Sysgo Real-Time Solutions, GmbH * Marius Groeger * * (C) Copyright 2002 * Sysgo Real-Time Solutions, GmbH * Alex Zuepke * * (C) Copyright 2002 * Gary Jennejohn, DENX Software Engineering, * * 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 #include extern void reset_cpu(ulong addr); #define TIMER_LOAD_VAL 0xffffffff /* macro to read the 32 bit timer */ #define READ_TIMER (*(volatile ulong *)(CFG_TIMERBASE+8)) #ifdef CONFIG_USE_IRQ /* enable IRQ 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, #0xc0\n" "msr cpsr_c, %1" : "=r" (old), "=r" (temp) : : "memory"); return (old & 0x80) == 0; } #else 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) { printf ("interrupt request\n"); show_regs (pt_regs); bad_mode (); } static ulong timestamp; static ulong lastdec; /* nothing really to do with interrupts, just starts up a counter. */ int interrupt_init (void) { int32_t val; /* Start the decrementer ticking down from 0xffffffff */ *((int32_t *) (CFG_TIMERBASE + LOAD_TIM)) = TIMER_LOAD_VAL; val = MPUTIM_ST | MPUTIM_AR | MPUTIM_CLOCK_ENABLE | (CFG_PVT << MPUTIM_PTV_BIT); *((int32_t *) (CFG_TIMERBASE + CNTL_TIMER)) = val; /* init the timestamp and lastdec value */ reset_timer_masked(); return (0); } /* * timer without interrupts */ void reset_timer (void) { reset_timer_masked (); } ulong get_timer (ulong base) { return get_timer_masked () - base; } void set_timer (ulong t) { timestamp = t; } /* delay x useconds AND perserve advance timstamp value */ void udelay (unsigned long usec) { ulong tmo, tmp; if(usec >= 1000){ /* if "big" number, spread normalization to seconds */ tmo = usec / 1000; /* start to normalize for usec to ticks per sec */ tmo *= CFG_HZ; /* find number of "ticks" to wait to achieve target */ tmo /= 1000; /* finish normalize. */ }else{ /* else small number, don't kill it prior to HZ multiply */ tmo = usec * CFG_HZ; tmo /= (1000*1000); } tmp = get_timer (0); /* get current timestamp */ if( (tmo + tmp) < tmp ) /* if setting this fordward will roll time stamp */ reset_timer_masked (); /* reset "advancing" timestamp to 0, set lastdec value */ else tmo += tmp; /* else, set advancing stamp wake up time */ while (get_timer_masked () < tmo)/* loop till event */ /*NOP*/; } void reset_timer_masked (void) { /* reset time */ lastdec = READ_TIMER; /* capure current decrementer value time */ timestamp = 0; /* start "advancing" time stamp from 0 */ } ulong get_timer_masked (void) { ulong now = READ_TIMER; /* current tick value */ if (lastdec >= now) { /* normal mode (non roll) */ /* normal mode */ timestamp += lastdec - now; /* move stamp fordward with absoulte diff ticks */ } else { /* we have overflow of the count down timer */ /* nts = ts + ld + (TLV - now) * ts=old stamp, ld=time that passed before passing through -1 * (TLV-now) amount of time after passing though -1 * nts = new "advancing time stamp"...it could also roll and cause problems. */ timestamp += lastdec + TIMER_LOAD_VAL - now; } lastdec = now; return timestamp; } /* waits specified delay value and resets timestamp */ void udelay_masked (unsigned long usec) { ulong tmo, tmp; if(usec >= 1000){ /* if "big" number, spread normalization to seconds */ tmo = usec / 1000; /* start to normalize for usec to ticks per sec */ tmo *= CFG_HZ; /* find number of "ticks" to wait to achieve target */ tmo /= 1000; /* finish normalize. */ }else{ /* else small number, don't kill it prior to HZ multiply */ tmo = usec * CFG_HZ; tmo /= (1000*1000); } reset_timer_masked (); /* set "advancing" timestamp to 0, set lastdec vaule */ while (get_timer_masked () < tmo) /* wait for time stamp to overtake tick number.*/ /*NOP*/; } /* * This function is derived from PowerPC code (read timebase as long long). * On ARM it just returns the timer value. */ unsigned long long get_ticks(void) { return get_timer(0); } /* * This function is derived from PowerPC code (timebase clock frequency). * On ARM it returns the number of timer ticks per second. */ ulong get_tbclk (void) { ulong tbclk; tbclk = CFG_HZ; return tbclk; }