93 lines
1.9 KiB
C
93 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (C) 2006-2007 PA Semi, Inc
|
|
*
|
|
* Maintained by: Olof Johansson <olof@lixom.net>
|
|
*/
|
|
|
|
#undef DEBUG
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/string.h>
|
|
#include <linux/irq.h>
|
|
|
|
#include <asm/machdep.h>
|
|
#include <asm/reg.h>
|
|
#include <asm/smp.h>
|
|
|
|
#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_WAKEDEC:
|
|
set_dec(1);
|
|
case SRR1_WAKEEE:
|
|
/*
|
|
* Handle these when interrupts get re-enabled and we take
|
|
* them as regular exceptions. We are in an NMI context
|
|
* and can't handle these here.
|
|
*/
|
|
break;
|
|
default:
|
|
/* do system reset */
|
|
return 0;
|
|
}
|
|
|
|
/* Set higher astate since we come out of power savings at 0 */
|
|
restore_astate(hard_smp_processor_id());
|
|
|
|
/* everything handled */
|
|
regs->msr |= MSR_RI;
|
|
return 1;
|
|
}
|
|
|
|
static int __init pasemi_idle_init(void)
|
|
{
|
|
#ifndef CONFIG_PPC_PASEMI_CPUFREQ
|
|
pr_warn("No cpufreq driver, powersavings modes disabled\n");
|
|
current_mode = 0;
|
|
#endif
|
|
|
|
ppc_md.system_reset_exception = pasemi_system_reset_exception;
|
|
ppc_md.power_save = modes[current_mode].entry;
|
|
pr_info("Using PA6T idle loop (%s)\n", modes[current_mode].name);
|
|
|
|
return 0;
|
|
}
|
|
machine_late_initcall(pasemi, pasemi_idle_init);
|
|
|
|
static int __init idle_param(char *p)
|
|
{
|
|
int i;
|
|
for (i = 0; i < ARRAY_SIZE(modes); i++) {
|
|
if (!strcmp(modes[i].name, p)) {
|
|
current_mode = i;
|
|
break;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
early_param("idle", idle_param);
|