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openrisc: Allow power off handler overriding

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The OpenRISC platform always defines a default pm_power_off hanlder
which is only useful for simulators.  Having this set also means power
management drivers like syscon-power are not able to wire in their own
pm_power_off handlers.

Fix this by not setting the pm_power_off handler by default and fallback
to the simulator power off handler if no handler is set.

This has been tested with a new OpenRISC virt platform I am working on
for QEMU.

  https://github.com/stffrdhrn/qemu/commits/or1k-virt

Cc: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Stafford Horne <shorne@gmail.com>
This commit is contained in:
Stafford Horne 2022-05-21 10:39:30 +09:00
parent ed3a88d7db
commit 83da38d82b
1 changed files with 15 additions and 2 deletions
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17
arch/openrisc/kernel/process.c
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@ -62,6 +62,16 @@ void machine_restart(char *cmd)
while (1); while (1);
} }
/*
* This is used if pm_power_off has not been set by a power management
* driver, in this case we can assume we are on a simulator. On
* OpenRISC simulators l.nop 1 will trigger the simulator exit.
*/
static void default_power_off(void)
{
__asm__("l.nop 1");
}
/* /*
* Similar to machine_power_off, but don't shut off power. Add code * Similar to machine_power_off, but don't shut off power. Add code
* here to freeze the system for e.g. post-mortem debug purpose when * here to freeze the system for e.g. post-mortem debug purpose when
@ -77,7 +87,10 @@ void machine_halt(void)
void machine_power_off(void) void machine_power_off(void)
{ {
printk(KERN_INFO "*** MACHINE POWER OFF ***\n"); printk(KERN_INFO "*** MACHINE POWER OFF ***\n");
__asm__("l.nop 1"); if (pm_power_off != NULL)
pm_power_off();
else
default_power_off();
} }
/* /*
@ -91,7 +104,7 @@ void arch_cpu_idle(void)
mtspr(SPR_PMR, mfspr(SPR_PMR) | SPR_PMR_DME); mtspr(SPR_PMR, mfspr(SPR_PMR) | SPR_PMR_DME);
} }
void (*pm_power_off) (void) = machine_power_off; void (*pm_power_off)(void) = NULL;
EXPORT_SYMBOL(pm_power_off); EXPORT_SYMBOL(pm_power_off);
/* /*