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Kirill Smelkov
linux
Commits
5a812999
Commit
5a812999
authored
Jul 17, 2007
by
Ralf Baechle
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[MIPS] Workaround for RM7000 WAIT instruction aka erratum 38
Signed-off-by:
Ralf Baechle
<
ralf@linux-mips.org
>
parent
17099b11
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arch/mips/kernel/cpu-probe.c
arch/mips/kernel/cpu-probe.c
+25
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arch/mips/kernel/cpu-probe.c
View file @
5a812999
...
...
@@ -75,6 +75,27 @@ static void r4k_wait_irqoff(void)
local_irq_enable
();
}
/*
* The RM7000 variant has to handle erratum 38. The workaround is to not
* have any pending stores when the WAIT instruction is executed.
*/
static
void
rm7k_wait_irqoff
(
void
)
{
local_irq_disable
();
if
(
!
need_resched
())
__asm__
(
" .set push
\n
"
" .set mips3
\n
"
" .set noat
\n
"
" mfc0 $1, $12
\n
"
" sync
\n
"
" mtc0 $1, $12 # stalls until W stage
\n
"
" wait
\n
"
" mtc0 $1, $12 # stalls until W stage
\n
"
" .set pop
\n
"
);
local_irq_enable
();
}
/* The Au1xxx wait is available only if using 32khz counter or
* external timer source, but specifically not CP0 Counter. */
int
allow_au1k_wait
;
...
...
@@ -132,7 +153,6 @@ static inline void check_wait(void)
case
CPU_R4700
:
case
CPU_R5000
:
case
CPU_NEVADA
:
case
CPU_RM7000
:
case
CPU_4KC
:
case
CPU_4KEC
:
case
CPU_4KSC
:
...
...
@@ -142,6 +162,10 @@ static inline void check_wait(void)
cpu_wait
=
r4k_wait
;
break
;
case
CPU_RM7000
:
cpu_wait
=
rm7k_wait_irqoff
;
break
;
case
CPU_24K
:
case
CPU_34K
:
cpu_wait
=
r4k_wait
;
...
...
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