mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 05:04:00 +08:00
347 lines
7.6 KiB
C
347 lines
7.6 KiB
C
|
/*
|
||
|
* PowerPC 4xx Clock and Power Management
|
||
|
*
|
||
|
* Copyright (C) 2010, Applied Micro Circuits Corporation
|
||
|
* Victor Gallardo (vgallardo@apm.com)
|
||
|
*
|
||
|
* Based on arch/powerpc/platforms/44x/idle.c:
|
||
|
* Jerone Young <jyoung5@us.ibm.com>
|
||
|
* Copyright 2008 IBM Corp.
|
||
|
*
|
||
|
* Based on arch/powerpc/sysdev/fsl_pmc.c:
|
||
|
* Anton Vorontsov <avorontsov@ru.mvista.com>
|
||
|
* Copyright 2009 MontaVista Software, Inc.
|
||
|
*
|
||
|
* See file CREDITS for list of people who contributed to this
|
||
|
* project.
|
||
|
*
|
||
|
* 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; either version 2 of
|
||
|
* the License, or (at your option) any later version.
|
||
|
*
|
||
|
* 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/kernel.h>
|
||
|
#include <linux/of_platform.h>
|
||
|
#include <linux/sysfs.h>
|
||
|
#include <linux/cpu.h>
|
||
|
#include <linux/suspend.h>
|
||
|
#include <asm/dcr.h>
|
||
|
#include <asm/dcr-native.h>
|
||
|
#include <asm/machdep.h>
|
||
|
|
||
|
#define CPM_ER 0
|
||
|
#define CPM_FR 1
|
||
|
#define CPM_SR 2
|
||
|
|
||
|
#define CPM_IDLE_WAIT 0
|
||
|
#define CPM_IDLE_DOZE 1
|
||
|
|
||
|
struct cpm {
|
||
|
dcr_host_t dcr_host;
|
||
|
unsigned int dcr_offset[3];
|
||
|
unsigned int powersave_off;
|
||
|
unsigned int unused;
|
||
|
unsigned int idle_doze;
|
||
|
unsigned int standby;
|
||
|
unsigned int suspend;
|
||
|
};
|
||
|
|
||
|
static struct cpm cpm;
|
||
|
|
||
|
struct cpm_idle_mode {
|
||
|
unsigned int enabled;
|
||
|
const char *name;
|
||
|
};
|
||
|
|
||
|
static struct cpm_idle_mode idle_mode[] = {
|
||
|
[CPM_IDLE_WAIT] = { 1, "wait" }, /* default */
|
||
|
[CPM_IDLE_DOZE] = { 0, "doze" },
|
||
|
};
|
||
|
|
||
|
static unsigned int cpm_set(unsigned int cpm_reg, unsigned int mask)
|
||
|
{
|
||
|
unsigned int value;
|
||
|
|
||
|
/* CPM controller supports 3 different types of sleep interface
|
||
|
* known as class 1, 2 and 3. For class 1 units, they are
|
||
|
* unconditionally put to sleep when the corresponding CPM bit is
|
||
|
* set. For class 2 and 3 units this is not case; if they can be
|
||
|
* put to to sleep, they will. Here we do not verify, we just
|
||
|
* set them and expect them to eventually go off when they can.
|
||
|
*/
|
||
|
value = dcr_read(cpm.dcr_host, cpm.dcr_offset[cpm_reg]);
|
||
|
dcr_write(cpm.dcr_host, cpm.dcr_offset[cpm_reg], value | mask);
|
||
|
|
||
|
/* return old state, to restore later if needed */
|
||
|
return value;
|
||
|
}
|
||
|
|
||
|
static void cpm_idle_wait(void)
|
||
|
{
|
||
|
unsigned long msr_save;
|
||
|
|
||
|
/* save off initial state */
|
||
|
msr_save = mfmsr();
|
||
|
/* sync required when CPM0_ER[CPU] is set */
|
||
|
mb();
|
||
|
/* set wait state MSR */
|
||
|
mtmsr(msr_save|MSR_WE|MSR_EE|MSR_CE|MSR_DE);
|
||
|
isync();
|
||
|
/* return to initial state */
|
||
|
mtmsr(msr_save);
|
||
|
isync();
|
||
|
}
|
||
|
|
||
|
static void cpm_idle_sleep(unsigned int mask)
|
||
|
{
|
||
|
unsigned int er_save;
|
||
|
|
||
|
/* update CPM_ER state */
|
||
|
er_save = cpm_set(CPM_ER, mask);
|
||
|
|
||
|
/* go to wait state so that CPM0_ER[CPU] can take effect */
|
||
|
cpm_idle_wait();
|
||
|
|
||
|
/* restore CPM_ER state */
|
||
|
dcr_write(cpm.dcr_host, cpm.dcr_offset[CPM_ER], er_save);
|
||
|
}
|
||
|
|
||
|
static void cpm_idle_doze(void)
|
||
|
{
|
||
|
cpm_idle_sleep(cpm.idle_doze);
|
||
|
}
|
||
|
|
||
|
static void cpm_idle_config(int mode)
|
||
|
{
|
||
|
int i;
|
||
|
|
||
|
if (idle_mode[mode].enabled)
|
||
|
return;
|
||
|
|
||
|
for (i = 0; i < ARRAY_SIZE(idle_mode); i++)
|
||
|
idle_mode[i].enabled = 0;
|
||
|
|
||
|
idle_mode[mode].enabled = 1;
|
||
|
}
|
||
|
|
||
|
static ssize_t cpm_idle_show(struct kobject *kobj,
|
||
|
struct kobj_attribute *attr, char *buf)
|
||
|
{
|
||
|
char *s = buf;
|
||
|
int i;
|
||
|
|
||
|
for (i = 0; i < ARRAY_SIZE(idle_mode); i++) {
|
||
|
if (idle_mode[i].enabled)
|
||
|
s += sprintf(s, "[%s] ", idle_mode[i].name);
|
||
|
else
|
||
|
s += sprintf(s, "%s ", idle_mode[i].name);
|
||
|
}
|
||
|
|
||
|
*(s-1) = '\n'; /* convert the last space to a newline */
|
||
|
|
||
|
return s - buf;
|
||
|
}
|
||
|
|
||
|
static ssize_t cpm_idle_store(struct kobject *kobj,
|
||
|
struct kobj_attribute *attr,
|
||
|
const char *buf, size_t n)
|
||
|
{
|
||
|
int i;
|
||
|
char *p;
|
||
|
int len;
|
||
|
|
||
|
p = memchr(buf, '\n', n);
|
||
|
len = p ? p - buf : n;
|
||
|
|
||
|
for (i = 0; i < ARRAY_SIZE(idle_mode); i++) {
|
||
|
if (strncmp(buf, idle_mode[i].name, len) == 0) {
|
||
|
cpm_idle_config(i);
|
||
|
return n;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
static struct kobj_attribute cpm_idle_attr =
|
||
|
__ATTR(idle, 0644, cpm_idle_show, cpm_idle_store);
|
||
|
|
||
|
static void cpm_idle_config_sysfs(void)
|
||
|
{
|
||
|
struct sys_device *sys_dev;
|
||
|
unsigned long ret;
|
||
|
|
||
|
sys_dev = get_cpu_sysdev(0);
|
||
|
|
||
|
ret = sysfs_create_file(&sys_dev->kobj,
|
||
|
&cpm_idle_attr.attr);
|
||
|
if (ret)
|
||
|
printk(KERN_WARNING
|
||
|
"cpm: failed to create idle sysfs entry\n");
|
||
|
}
|
||
|
|
||
|
static void cpm_idle(void)
|
||
|
{
|
||
|
if (idle_mode[CPM_IDLE_DOZE].enabled)
|
||
|
cpm_idle_doze();
|
||
|
else
|
||
|
cpm_idle_wait();
|
||
|
}
|
||
|
|
||
|
static int cpm_suspend_valid(suspend_state_t state)
|
||
|
{
|
||
|
switch (state) {
|
||
|
case PM_SUSPEND_STANDBY:
|
||
|
return !!cpm.standby;
|
||
|
case PM_SUSPEND_MEM:
|
||
|
return !!cpm.suspend;
|
||
|
default:
|
||
|
return 0;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static void cpm_suspend_standby(unsigned int mask)
|
||
|
{
|
||
|
unsigned long tcr_save;
|
||
|
|
||
|
/* disable decrement interrupt */
|
||
|
tcr_save = mfspr(SPRN_TCR);
|
||
|
mtspr(SPRN_TCR, tcr_save & ~TCR_DIE);
|
||
|
|
||
|
/* go to sleep state */
|
||
|
cpm_idle_sleep(mask);
|
||
|
|
||
|
/* restore decrement interrupt */
|
||
|
mtspr(SPRN_TCR, tcr_save);
|
||
|
}
|
||
|
|
||
|
static int cpm_suspend_enter(suspend_state_t state)
|
||
|
{
|
||
|
switch (state) {
|
||
|
case PM_SUSPEND_STANDBY:
|
||
|
cpm_suspend_standby(cpm.standby);
|
||
|
break;
|
||
|
case PM_SUSPEND_MEM:
|
||
|
cpm_suspend_standby(cpm.suspend);
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static struct platform_suspend_ops cpm_suspend_ops = {
|
||
|
.valid = cpm_suspend_valid,
|
||
|
.enter = cpm_suspend_enter,
|
||
|
};
|
||
|
|
||
|
static int cpm_get_uint_property(struct device_node *np,
|
||
|
const char *name)
|
||
|
{
|
||
|
int len;
|
||
|
const unsigned int *prop = of_get_property(np, name, &len);
|
||
|
|
||
|
if (prop == NULL || len < sizeof(u32))
|
||
|
return 0;
|
||
|
|
||
|
return *prop;
|
||
|
}
|
||
|
|
||
|
static int __init cpm_init(void)
|
||
|
{
|
||
|
struct device_node *np;
|
||
|
int dcr_base, dcr_len;
|
||
|
int ret = 0;
|
||
|
|
||
|
if (!cpm.powersave_off) {
|
||
|
cpm_idle_config(CPM_IDLE_WAIT);
|
||
|
ppc_md.power_save = &cpm_idle;
|
||
|
}
|
||
|
|
||
|
np = of_find_compatible_node(NULL, NULL, "ibm,cpm");
|
||
|
if (!np) {
|
||
|
ret = -EINVAL;
|
||
|
goto out;
|
||
|
}
|
||
|
|
||
|
dcr_base = dcr_resource_start(np, 0);
|
||
|
dcr_len = dcr_resource_len(np, 0);
|
||
|
|
||
|
if (dcr_base == 0 || dcr_len == 0) {
|
||
|
printk(KERN_ERR "cpm: could not parse dcr property for %s\n",
|
||
|
np->full_name);
|
||
|
ret = -EINVAL;
|
||
|
goto out;
|
||
|
}
|
||
|
|
||
|
cpm.dcr_host = dcr_map(np, dcr_base, dcr_len);
|
||
|
|
||
|
if (!DCR_MAP_OK(cpm.dcr_host)) {
|
||
|
printk(KERN_ERR "cpm: failed to map dcr property for %s\n",
|
||
|
np->full_name);
|
||
|
ret = -EINVAL;
|
||
|
goto out;
|
||
|
}
|
||
|
|
||
|
/* All 4xx SoCs with a CPM controller have one of two
|
||
|
* different order for the CPM registers. Some have the
|
||
|
* CPM registers in the following order (ER,FR,SR). The
|
||
|
* others have them in the following order (SR,ER,FR).
|
||
|
*/
|
||
|
|
||
|
if (cpm_get_uint_property(np, "er-offset") == 0) {
|
||
|
cpm.dcr_offset[CPM_ER] = 0;
|
||
|
cpm.dcr_offset[CPM_FR] = 1;
|
||
|
cpm.dcr_offset[CPM_SR] = 2;
|
||
|
} else {
|
||
|
cpm.dcr_offset[CPM_ER] = 1;
|
||
|
cpm.dcr_offset[CPM_FR] = 2;
|
||
|
cpm.dcr_offset[CPM_SR] = 0;
|
||
|
}
|
||
|
|
||
|
/* Now let's see what IPs to turn off for the following modes */
|
||
|
|
||
|
cpm.unused = cpm_get_uint_property(np, "unused-units");
|
||
|
cpm.idle_doze = cpm_get_uint_property(np, "idle-doze");
|
||
|
cpm.standby = cpm_get_uint_property(np, "standby");
|
||
|
cpm.suspend = cpm_get_uint_property(np, "suspend");
|
||
|
|
||
|
/* If some IPs are unused let's turn them off now */
|
||
|
|
||
|
if (cpm.unused) {
|
||
|
cpm_set(CPM_ER, cpm.unused);
|
||
|
cpm_set(CPM_FR, cpm.unused);
|
||
|
}
|
||
|
|
||
|
/* Now let's export interfaces */
|
||
|
|
||
|
if (!cpm.powersave_off && cpm.idle_doze)
|
||
|
cpm_idle_config_sysfs();
|
||
|
|
||
|
if (cpm.standby || cpm.suspend)
|
||
|
suspend_set_ops(&cpm_suspend_ops);
|
||
|
out:
|
||
|
if (np)
|
||
|
of_node_put(np);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
late_initcall(cpm_init);
|
||
|
|
||
|
static int __init cpm_powersave_off(char *arg)
|
||
|
{
|
||
|
cpm.powersave_off = 1;
|
||
|
return 0;
|
||
|
}
|
||
|
__setup("powersave=off", cpm_powersave_off);
|