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Blackfin: enable support for nested interrupts

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During cpu init, make sure we initialize the CEC properly so that
interrupts can fire and be handled while U-Boot is running.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger 2008-06-01 01:23:48 -04:00
parent 39782727e1
commit 70c4c032ea
1 changed files with 10 additions and 4 deletions
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14
cpu/blackfin/start.S
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@ -75,7 +75,7 @@ ENTRY(_start)
serial_early_puts("Init Registers");
/* Disable nested interrupts and enable CYCLES for udelay() */
/* Disable self-nested interrupts and enable CYCLES for udelay() */
R0 = CCEN | 0x30;
SYSCFG = R0;
@ -180,7 +180,7 @@ ENTRY(_start)
/* Now lower ourselves from the highest interrupt level to
* the lowest. We do this by masking all interrupts but 15,
* setting the 15 handler to "board_init_f", raising the 15
* setting the 15 handler to ".Lenable_nested", raising the 15
* interrupt, and then returning from the highest interrupt
* level to the dummy "jump" until the interrupt controller
* services the pending 15 interrupt.
@ -190,8 +190,8 @@ ENTRY(_start)
r1 = r6;
p0.l = LO(EVT15);
p0.h = HI(EVT15);
p1.l = _cpu_init_f;
p1.h = _cpu_init_f;
p1.l = .Lenable_nested;
p1.h = .Lenable_nested;
[p0] = p1;
p2.l = LO(IMASK);
p2.h = HI(IMASK);
@ -204,6 +204,12 @@ ENTRY(_start)
reti = p4;
rti;
/* Enable nested interrupts before continuing with cpu init */
.Lenable_nested:
cli r7;
[--sp] = reti;
jump.l _cpu_init_f;
.LWAIT_HERE:
jump .LWAIT_HERE;
ENDPROC(_start)