[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>
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@ -4,7 +4,7 @@ endif
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obj-y := pci.o lpar.o hvCall.o nvram.o reconfig.o \
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setup.o iommu.o ras.o rtasd.o pci_dlpar.o \
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firmware.o
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firmware.o power.o
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obj-$(CONFIG_SMP) += smp.o
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obj-$(CONFIG_XICS) += xics.o
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obj-$(CONFIG_SCANLOG) += scanlog.o
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87
arch/powerpc/platforms/pseries/power.c
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87
arch/powerpc/platforms/pseries/power.c
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@ -0,0 +1,87 @@
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/*
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* Interface for power-management for ppc64 compliant platform
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*
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* Manish Ahuja <mahuja@us.ibm.com>
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*
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* Feb 2007
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*
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* Copyright (C) 2007 IBM Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kobject.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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unsigned long rtas_poweron_auto; /* default and normal state is 0 */
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static ssize_t auto_poweron_show(struct subsystem *subsys, char *buf)
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{
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return sprintf(buf, "%lu\n", rtas_poweron_auto);
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}
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static ssize_t
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auto_poweron_store(struct subsystem *subsys, const char *buf, size_t n)
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{
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int ret;
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unsigned long ups_restart;
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ret = sscanf(buf, "%lu", &ups_restart);
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if ((ret == 1) && ((ups_restart == 1) || (ups_restart == 0))){
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rtas_poweron_auto = ups_restart;
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return n;
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}
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return -EINVAL;
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}
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static struct subsys_attribute auto_poweron_attr = {
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.attr = {
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.name = __stringify(auto_poweron),
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.mode = 0644,
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},
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.show = auto_poweron_show,
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.store = auto_poweron_store,
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};
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#ifndef CONFIG_PM
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decl_subsys(power,NULL,NULL);
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static struct attribute *g[] = {
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&auto_poweron_attr.attr,
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NULL,
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};
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static struct attribute_group attr_group = {
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.attrs = g,
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};
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static int __init pm_init(void)
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{
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int error = subsystem_register(&power_subsys);
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if (!error)
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error = sysfs_create_group(&power_subsys.kset.kobj,&attr_group);
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return error;
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}
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core_initcall(pm_init);
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#else
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extern struct subsystem power_subsys;
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static int __init apo_pm_init(void)
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{
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return (subsys_create_file(&power_subsys, &auto_poweron_attr));
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}
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__initcall(apo_pm_init);
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#endif
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@ -33,4 +33,7 @@ static inline void setup_kexec_cpu_down_xics(void) { }
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static inline void setup_kexec_cpu_down_mpic(void) { }
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#endif
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/* Poweron flag used for enabling auto ups restart */
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extern unsigned long rtas_poweron_auto;
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#endif /* _PSERIES_PSERIES_H */
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@ -486,6 +486,34 @@ static int pSeries_pci_probe_mode(struct pci_bus *bus)
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return PCI_PROBE_NORMAL;
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}
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/**
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* pSeries_power_off - tell firmware about how to power off the system.
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*
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* This function calls either the power-off rtas token in normal cases
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* or the ibm,power-off-ups token (if present & requested) in case of
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* a power failure. If power-off token is used, power on will only be
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* possible with power button press. If ibm,power-off-ups token is used
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* it will allow auto poweron after power is restored.
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*/
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void pSeries_power_off(void)
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{
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int rc;
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int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
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if (rtas_flash_term_hook)
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rtas_flash_term_hook(SYS_POWER_OFF);
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if (rtas_poweron_auto == 0 ||
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rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
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rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
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printk(KERN_INFO "RTAS power-off returned %d\n", rc);
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} else {
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rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
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printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
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}
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for (;;);
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}
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define_machine(pseries) {
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.name = "pSeries",
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.probe = pSeries_probe,
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@ -496,7 +524,7 @@ define_machine(pseries) {
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.pcibios_fixup = pSeries_final_fixup,
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.pci_probe_mode = pSeries_pci_probe_mode,
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.restart = rtas_restart,
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.power_off = rtas_power_off,
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.power_off = pSeries_power_off,
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.halt = rtas_halt,
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.panic = rtas_os_term,
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.get_boot_time = rtas_get_boot_time,
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