mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-27 04:18:51 +09:00
319 lines
7.8 KiB
C
319 lines
7.8 KiB
C
/*
|
|
* (C) Copyright 2003
|
|
* Texas Instruments, <www.ti.com>
|
|
*
|
|
* (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>
|
|
*
|
|
* (C) Copyright 2002
|
|
* Gary Jennejohn, DENX Software Engineering, <gj@denx.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 <arm925t.h>
|
|
#include <configs/omap1510.h>
|
|
|
|
#include <asm/proc-armv/ptrace.h>
|
|
|
|
#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 preserve advance timestamp 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 + 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 */
|
|
|
|
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)
|
|
{
|
|
#ifdef CONFIG_INNOVATOROMAP1510
|
|
#define LOOPS_PER_MSEC 60 /* tuned on omap1510 */
|
|
volatile int i, time_remaining = LOOPS_PER_MSEC*usec;
|
|
for (i=time_remaining; i>0; i--) { }
|
|
#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);
|
|
}
|
|
|
|
endtime = get_timer_masked () + tmo;
|
|
|
|
do {
|
|
ulong now = get_timer_masked ();
|
|
diff = endtime - now;
|
|
} while (diff >= 0);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
}
|