2007-02-04 22:36:51 +00:00
|
|
|
/*
|
|
|
|
* Copyright (C) 2006-2007 PA Semi, Inc
|
|
|
|
*
|
|
|
|
* Maintained by: Olof Johansson <olof@lixom.net>
|
|
|
|
*
|
|
|
|
* This program is free software; you can redistribute it and/or modify
|
|
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
|
|
* published by the Free Software Foundation.
|
|
|
|
*
|
|
|
|
* 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
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
|
|
|
|
#undef DEBUG
|
|
|
|
|
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/string.h>
|
2007-05-11 05:40:36 +00:00
|
|
|
#include <linux/irq.h>
|
2007-02-04 22:36:51 +00:00
|
|
|
|
|
|
|
#include <asm/machdep.h>
|
|
|
|
#include <asm/reg.h>
|
2007-05-28 00:20:45 +00:00
|
|
|
#include <asm/smp.h>
|
2007-02-04 22:36:51 +00:00
|
|
|
|
|
|
|
#include "pasemi.h"
|
|
|
|
|
|
|
|
struct sleep_mode {
|
|
|
|
char *name;
|
|
|
|
void (*entry)(void);
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct sleep_mode modes[] = {
|
|
|
|
{ .name = "spin", .entry = &idle_spin },
|
|
|
|
{ .name = "doze", .entry = &idle_doze },
|
|
|
|
};
|
|
|
|
|
|
|
|
static int current_mode = 0;
|
|
|
|
|
|
|
|
static int pasemi_system_reset_exception(struct pt_regs *regs)
|
|
|
|
{
|
|
|
|
/* If we were woken up from power savings, we need to return
|
|
|
|
* to the calling function, since nip is not saved across
|
|
|
|
* all modes.
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (regs->msr & SRR1_WAKEMASK)
|
|
|
|
regs->nip = regs->link;
|
|
|
|
|
|
|
|
switch (regs->msr & SRR1_WAKEMASK) {
|
|
|
|
case SRR1_WAKEEE:
|
|
|
|
do_IRQ(regs);
|
|
|
|
break;
|
|
|
|
case SRR1_WAKEDEC:
|
|
|
|
timer_interrupt(regs);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
/* do system reset */
|
|
|
|
return 0;
|
|
|
|
}
|
2007-04-27 05:46:01 +00:00
|
|
|
|
|
|
|
/* Set higher astate since we come out of power savings at 0 */
|
|
|
|
restore_astate(hard_smp_processor_id());
|
|
|
|
|
2007-02-04 22:36:51 +00:00
|
|
|
/* everything handled */
|
|
|
|
regs->msr |= MSR_RI;
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
2007-09-05 02:09:45 +00:00
|
|
|
static int __init pasemi_idle_init(void)
|
2007-02-04 22:36:51 +00:00
|
|
|
{
|
2007-09-05 02:09:45 +00:00
|
|
|
if (!machine_is(pasemi))
|
|
|
|
return -ENODEV;
|
|
|
|
|
2007-04-27 05:46:01 +00:00
|
|
|
#ifndef CONFIG_PPC_PASEMI_CPUFREQ
|
|
|
|
printk(KERN_WARNING "No cpufreq driver, powersavings modes disabled\n");
|
|
|
|
current_mode = 0;
|
|
|
|
#endif
|
|
|
|
|
2007-02-04 22:36:51 +00:00
|
|
|
ppc_md.system_reset_exception = pasemi_system_reset_exception;
|
|
|
|
ppc_md.power_save = modes[current_mode].entry;
|
|
|
|
printk(KERN_INFO "Using PA6T idle loop (%s)\n", modes[current_mode].name);
|
2007-09-05 02:09:45 +00:00
|
|
|
|
|
|
|
return 0;
|
2007-02-04 22:36:51 +00:00
|
|
|
}
|
2007-09-05 02:09:45 +00:00
|
|
|
late_initcall(pasemi_idle_init);
|
2007-02-04 22:36:51 +00:00
|
|
|
|
|
|
|
static int __init idle_param(char *p)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
for (i = 0; i < sizeof(modes)/sizeof(struct sleep_mode); i++) {
|
|
|
|
if (!strcmp(modes[i].name, p)) {
|
|
|
|
current_mode = i;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
early_param("idle", idle_param);
|