[POWERPC] pseries: Enabling auto poweron after power is restored.

During power outages, the UPS notifies the system for a shutdown.
In the current setup, it isn't possible to poweron when power is
restored.  This patch fixes the issue by calling the right
ibm,power-off-ups token during such events.  It also adds a sysfs
interface so userspace can specify whether or not to power on when
power is restored.

Signed-off-by: Manish Ahuja <ahuja@austin.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Manish Ahuja 2007-02-08 16:01:17 -06:00 committed by Paul Mackerras
parent aebcbf39be
commit 5d30bf3097
4 changed files with 120 additions and 2 deletions

View File

@ -4,7 +4,7 @@ endif
obj-y := pci.o lpar.o hvCall.o nvram.o reconfig.o \
setup.o iommu.o ras.o rtasd.o pci_dlpar.o \
firmware.o
firmware.o power.o
obj-$(CONFIG_SMP) += smp.o
obj-$(CONFIG_XICS) += xics.o
obj-$(CONFIG_SCANLOG) += scanlog.o

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@ -0,0 +1,87 @@
/*
* Interface for power-management for ppc64 compliant platform
*
* Manish Ahuja <mahuja@us.ibm.com>
*
* Feb 2007
*
* Copyright (C) 2007 IBM Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/kobject.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/init.h>
unsigned long rtas_poweron_auto; /* default and normal state is 0 */
static ssize_t auto_poweron_show(struct subsystem *subsys, char *buf)
{
return sprintf(buf, "%lu\n", rtas_poweron_auto);
}
static ssize_t
auto_poweron_store(struct subsystem *subsys, const char *buf, size_t n)
{
int ret;
unsigned long ups_restart;
ret = sscanf(buf, "%lu", &ups_restart);
if ((ret == 1) && ((ups_restart == 1) || (ups_restart == 0))){
rtas_poweron_auto = ups_restart;
return n;
}
return -EINVAL;
}
static struct subsys_attribute auto_poweron_attr = {
.attr = {
.name = __stringify(auto_poweron),
.mode = 0644,
},
.show = auto_poweron_show,
.store = auto_poweron_store,
};
#ifndef CONFIG_PM
decl_subsys(power,NULL,NULL);
static struct attribute *g[] = {
&auto_poweron_attr.attr,
NULL,
};
static struct attribute_group attr_group = {
.attrs = g,
};
static int __init pm_init(void)
{
int error = subsystem_register(&power_subsys);
if (!error)
error = sysfs_create_group(&power_subsys.kset.kobj,&attr_group);
return error;
}
core_initcall(pm_init);
#else
extern struct subsystem power_subsys;
static int __init apo_pm_init(void)
{
return (subsys_create_file(&power_subsys, &auto_poweron_attr));
}
__initcall(apo_pm_init);
#endif

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@ -33,4 +33,7 @@ static inline void setup_kexec_cpu_down_xics(void) { }
static inline void setup_kexec_cpu_down_mpic(void) { }
#endif
/* Poweron flag used for enabling auto ups restart */
extern unsigned long rtas_poweron_auto;
#endif /* _PSERIES_PSERIES_H */

View File

@ -486,6 +486,34 @@ static int pSeries_pci_probe_mode(struct pci_bus *bus)
return PCI_PROBE_NORMAL;
}
/**
* pSeries_power_off - tell firmware about how to power off the system.
*
* This function calls either the power-off rtas token in normal cases
* or the ibm,power-off-ups token (if present & requested) in case of
* a power failure. If power-off token is used, power on will only be
* possible with power button press. If ibm,power-off-ups token is used
* it will allow auto poweron after power is restored.
*/
void pSeries_power_off(void)
{
int rc;
int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
if (rtas_flash_term_hook)
rtas_flash_term_hook(SYS_POWER_OFF);
if (rtas_poweron_auto == 0 ||
rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
printk(KERN_INFO "RTAS power-off returned %d\n", rc);
} else {
rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
}
for (;;);
}
define_machine(pseries) {
.name = "pSeries",
.probe = pSeries_probe,
@ -496,7 +524,7 @@ define_machine(pseries) {
.pcibios_fixup = pSeries_final_fixup,
.pci_probe_mode = pSeries_pci_probe_mode,
.restart = rtas_restart,
.power_off = rtas_power_off,
.power_off = pSeries_power_off,
.halt = rtas_halt,
.panic = rtas_os_term,
.get_boot_time = rtas_get_boot_time,