*
* 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
#include <arm925t.h>
#include <configs/omap1510.h>
-#include <asm/proc-armv/ptrace.h>
-
-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;
{
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);
}
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;
return timestamp;
}
+/* waits specified delay value and resets timestamp */
void udelay_masked (unsigned long usec)
{
#ifdef CONFIG_INNOVATOROMAP1510
#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
}
* 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;
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