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authorStafford Horne <shorne@gmail.com>2022-05-21 04:39:30 +0300
committerStafford Horne <shorne@gmail.com>2022-05-23 11:15:50 +0300
commit83da38d82b2f7ac207646e55be94e8bd642e2c39 (patch)
treec2dee6643ee127c27d9c0e98a6f158b261d34561 /arch/openrisc
parented3a88d7dbbb924312a707d5f295b7a31e2f8d2d (diff)
downloadlinux-83da38d82b2f7ac207646e55be94e8bd642e2c39.tar.xz
openrisc: Allow power off handler overriding
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>
Diffstat (limited to 'arch/openrisc')
-rw-r--r--arch/openrisc/kernel/process.c17
1 files changed, 15 insertions, 2 deletions
diff --git a/arch/openrisc/kernel/process.c b/arch/openrisc/kernel/process.c
index 4cce95fa6eb5..1d4c0921aafa 100644
--- a/arch/openrisc/kernel/process.c
+++ b/arch/openrisc/kernel/process.c
@@ -63,6 +63,16 @@ void machine_restart(char *cmd)
}
/*
+ * 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
* here to freeze the system for e.g. post-mortem debug purpose when
* possible. This halt has nothing to do with the idle halt.
@@ -77,7 +87,10 @@ void machine_halt(void)
void machine_power_off(void)
{
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);
}
-void (*pm_power_off) (void) = machine_power_off;
+void (*pm_power_off)(void) = NULL;
EXPORT_SYMBOL(pm_power_off);
/*