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[POWERPC] pasemi: Idle loops

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Powersave support on PA6T. Right now it only uses 'doze' mode, and
will default to no savings (spin).

Signed-off-by: Olof Johansson <olof@lixom.net>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Olof Johansson 2007-02-04 16:36:51 -06:00 committed by Paul Mackerras
parent bfed9d32d9
commit 1199919b69
9 changed files with 228 additions and 2 deletions
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1
arch/powerpc/kernel/Makefile
View File

@ -17,6 +17,7 @@ obj-y += vdso32/
obj-$(CONFIG_PPC64) += setup_64.o binfmt_elf32.o sys_ppc32.o \
signal_64.o ptrace32.o \
paca.o cpu_setup_ppc970.o \
cpu_setup_pa6t.o \
firmware.o sysfs.o nvram_64.o
obj-$(CONFIG_PPC64) += vdso64/
obj-$(CONFIG_ALTIVEC) += vecemu.o vector.o

44
arch/powerpc/kernel/cpu_setup_pa6t.S Normal file
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@ -0,0 +1,44 @@
/*
* 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
*
*/
#include <asm/processor.h>
#include <asm/page.h>
#include <asm/cputable.h>
#include <asm/ppc_asm.h>
#include <asm/asm-offsets.h>
#include <asm/cache.h>
/* Right now, restore and setup are the same thing */
_GLOBAL(__restore_cpu_pa6t)
_GLOBAL(__setup_cpu_pa6t)
/* Do nothing if not running in HV mode */
mfmsr r0
rldicl. r0,r0,4,63
beqlr
mfspr r0,SPRN_HID5
ori r0,r0,0x30
mtspr SPRN_HID5,r0
mfspr r0,SPRN_LPCR
ori r0,r0,0x7000
mtspr SPRN_LPCR,r0
blr

4
arch/powerpc/kernel/cputable.c
View File

@ -43,6 +43,8 @@ extern void __setup_cpu_745x(unsigned long offset, struct cpu_spec* spec);
#ifdef CONFIG_PPC64
extern void __setup_cpu_ppc970(unsigned long offset, struct cpu_spec* spec);
extern void __setup_cpu_ppc970MP(unsigned long offset, struct cpu_spec* spec);
extern void __setup_cpu_pa6t(unsigned long offset, struct cpu_spec* spec);
extern void __restore_cpu_pa6t(unsigned long offset, struct cpu_spec* spec);
extern void __restore_cpu_ppc970(void);
#endif /* CONFIG_PPC64 */
@ -369,6 +371,8 @@ static struct cpu_spec cpu_specs[] = {
.dcache_bsize = 64,
.num_pmcs = 6,
.pmc_type = PPC_PMC_PA6T,
.cpu_setup = __setup_cpu_pa6t,
.cpu_restore = __restore_cpu_pa6t,
.platform = "pa6t",
},
{ /* default match */

3
arch/powerpc/platforms/pasemi/Makefile
View File

@ -1 +1,2 @@
obj-y += setup.o pci.o time.o
obj-y += setup.o pci.o time.o idle.o powersave.o

88
arch/powerpc/platforms/pasemi/idle.c Normal file
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@ -0,0 +1,88 @@
/*
* 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>
#include <asm/machdep.h>
#include <asm/reg.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_WAKEEE:
do_IRQ(regs);
break;
case SRR1_WAKEDEC:
timer_interrupt(regs);
break;
default:
/* do system reset */
return 0;
}
/* everything handled */
regs->msr |= MSR_RI;
return 1;
}
void __init pasemi_idle_init(void)
{
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);
}
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);

7
arch/powerpc/platforms/pasemi/pasemi.h
View File

@ -4,4 +4,11 @@
extern unsigned long pas_get_boot_time(void);
extern void pas_pci_init(void);
extern void __init pasemi_idle_init(void);
/* Power savings modes, implemented in asm */
extern void idle_spin(void);
extern void idle_doze(void);
#endif /* _PASEMI_PASEMI_H */

80
arch/powerpc/platforms/pasemi/powersave.S Normal file
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@ -0,0 +1,80 @@
/*
* 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
*
*/
#include <asm/processor.h>
#include <asm/page.h>
#include <asm/ppc_asm.h>
#include <asm/cputable.h>
#include <asm/cache.h>
#include <asm/thread_info.h>
#include <asm/asm-offsets.h>
/* Power savings opcodes since not all binutils have them at this time */
#define DOZE .long 0x4c000324
#define NAP .long 0x4c000364
#define SLEEP .long 0x4c0003a4
#define RVW .long 0x4c0003e4
/* Common sequence to do before going to any of the
* powersavings modes.
*/
#define PRE_SLEEP_SEQUENCE \
std r3,8(r1); \
ptesync ; \
ld r3,8(r1); \
1: cmpd r3,r3; \
bne 1b
_doze:
PRE_SLEEP_SEQUENCE
DOZE
b .
_GLOBAL(idle_spin)
blr
_GLOBAL(idle_doze)
LOAD_REG_ADDR(r3, _doze)
b sleep_common
/* Add more modes here later */
sleep_common:
mflr r0
std r0, 16(r1)
stdu r1,-64(r1)
LOAD_REG_IMMEDIATE(r6,MSR_DR|MSR_IR|MSR_ME|MSR_EE)
mfmsr r4
andc r5,r4,r6
mtmsrd r5,0
mtctr r3
bctrl
mtmsrd r4,0
addi r1,r1,64
ld r0,16(r1)
mtlr r0
blr

2
arch/powerpc/platforms/pasemi/setup.c
View File

@ -82,7 +82,7 @@ void __init pas_setup_arch(void)
conswitchp = &dummy_con;
#endif
printk(KERN_DEBUG "Using default idle loop\n");
pasemi_idle_init();
}
/* No legacy IO on our parts */

1
include/asm-powerpc/reg.h
View File

@ -166,6 +166,7 @@
#define SPRN_TBWU 0x11D /* Time Base Upper Register (super, R/W) */
#define SPRN_SPURR 0x134 /* Scaled PURR */
#define SPRN_HIOR 0x137 /* 970 Hypervisor interrupt offset */
#define SPRN_LPCR 0x13E /* LPAR Control Register */
#define SPRN_DBAT0L 0x219 /* Data BAT 0 Lower Register */
#define SPRN_DBAT0U 0x218 /* Data BAT 0 Upper Register */
#define SPRN_DBAT1L 0x21B /* Data BAT 1 Lower Register */