X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=cpu%2Farm925t%2Finterrupts.c;h=208a25bd96429aef20622da4accffb02d1a27e38;hb=12bc4e94251c369c529ffa505cf58b148c372f7f;hp=ed8a1c7718ad1a23a10cd332c068bd0fc66f1822;hpb=2e5983d2ea5ff21406408c18c5b8fa12d4250908;p=u-boot diff --git a/cpu/arm925t/interrupts.c b/cpu/arm925t/interrupts.c index ed8a1c7718..208a25bd96 100644 --- a/cpu/arm925t/interrupts.c +++ b/cpu/arm925t/interrupts.c @@ -23,7 +23,7 @@ * * 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 + * 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 @@ -36,148 +36,11 @@ #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; @@ -186,9 +49,14 @@ 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); } @@ -211,46 +79,50 @@ void set_timer (ulong t) timestamp = t; } -/* very rough timer... */ +/* delay x useconds AND preserve advance timestamp value */ void udelay (unsigned long usec) { -#ifdef CONFIG_INNOVATOROMAP1510 -#define LOOPS_PER_MSEC 60 /* tuned on omap1510 */ - volatile int i, time_remaining = LOOPS_PER_MSEC * usec; + ulong tmo, tmp; - for (i = time_remaining; i > 0; i--) { + 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); } -#else - - ulong tmo; - tmo = usec / 1000; - tmo *= CFG_HZ; - tmo /= 1000; + tmp = get_timer (0); /* get current timestamp */ + if( (tmo + tmp + 1) < 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 */ - tmo += get_timer (0); - - while (get_timer_masked () < tmo) + while (get_timer_masked () < tmo) /* loop till event */ /*NOP*/; -#endif } void reset_timer_masked (void) { /* reset time */ - lastdec = READ_TIMER; - timestamp = 0; + 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 */ + ulong now = READ_TIMER; /* current tick value */ - if (lastdec >= now) { /* did I roll (rem decrementer) */ + if (lastdec >= now) { /* normal mode (non roll) */ /* normal mode */ - timestamp += lastdec - now; /* record amount of time since last check */ - } else { - /* we have an overflow ... */ + 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; @@ -258,6 +130,7 @@ ulong get_timer_masked (void) return timestamp; } +/* waits specified delay value and resets timestamp */ void udelay_masked (unsigned long usec) { #ifdef CONFIG_INNOVATOROMAP1510 @@ -267,15 +140,24 @@ void udelay_masked (unsigned long usec) #else ulong tmo; + ulong endtime; + signed long diff; + + 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); + } - tmo = usec / 1000; - tmo *= CFG_HZ; - tmo /= 1000; + endtime = get_timer_masked () + tmo; - reset_timer_masked (); - - while (get_timer_masked () < tmo) - /*NOP*/; + do { + ulong now = get_timer_masked (); + diff = endtime - now; + } while (diff >= 0); #endif } @@ -293,7 +175,7 @@ unsigned long long get_ticks(void) * On ARM it returns the number of timer ticks per second. */ ulong get_tbclk (void) -{ /* poor timer, may need to improve especiall for bootp. */ +{ ulong tbclk; tbclk = CFG_HZ;