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sparc32, leon: Enable interrupts before going idle to avoid getting stuck

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This enables interrupts for Leon before having the CPU enter power-down mode.

Commit 87fa05aeb3a5e8e21b1a5510eef6983650eff092, "sparc: Use generic idle loop",
gets the CPU stuck on idle for Leon systems. On Leon, disabling interrupts and
powering down the processor will get the processor stuck waiting for an
interrupt that will never be reacted to.

Signed-off-by: Andreas Larsson <andreas@gaisler.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andreas Larsson 2013-06-10 08:56:41 +02:00 committed by David S. Miller
parent 1ffbc51a0d
commit d72ee6be58
1 changed files with 7 additions and 0 deletions
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7
arch/sparc/kernel/leon_pmc.c
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@ -47,6 +47,10 @@ void pmc_leon_idle_fixup(void)
* MMU does not get a TLB miss here by using the MMU BYPASS ASI.
*/
register unsigned int address = (unsigned int)leon3_irqctrl_regs;
/* Interrupts need to be enabled to not hang the CPU */
local_irq_enable();
__asm__ __volatile__ (
"wr %%g0, %%asr19\n"
"lda [%0] %1, %%g0\n"
@ -60,6 +64,9 @@ void pmc_leon_idle_fixup(void)
*/
void pmc_leon_idle(void)
{
/* Interrupts need to be enabled to not hang the CPU */
local_irq_enable();
/* For systems without power-down, this will be no-op */
__asm__ __volatile__ ("wr %g0, %asr19\n\t");
}