0b4d414714
The semantic effect of insert_at_head is that it would allow new registered sysctl entries to override existing sysctl entries of the same name. Which is pain for caching and the proc interface never implemented. I have done an audit and discovered that none of the current users of register_sysctl care as (excpet for directories) they do not register duplicate sysctl entries. So this patch simply removes the support for overriding existing entries in the sys_sysctl interface since no one uses it or cares and it makes future enhancments harder. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Acked-by: Ralf Baechle <ralf@linux-mips.org> Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: David Howells <dhowells@redhat.com> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Andi Kleen <ak@muc.de> Cc: Jens Axboe <axboe@kernel.dk> Cc: Corey Minyard <minyard@acm.org> Cc: Neil Brown <neilb@suse.de> Cc: "John W. Linville" <linville@tuxdriver.com> Cc: James Bottomley <James.Bottomley@steeleye.com> Cc: Jan Kara <jack@ucw.cz> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Cc: Mark Fasheh <mark.fasheh@oracle.com> Cc: David Chinner <dgc@sgi.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Patrick McHardy <kaber@trash.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
464 lines
8.6 KiB
C
464 lines
8.6 KiB
C
/*
|
|
* FR-V Power Management Routines
|
|
*
|
|
* Copyright (c) 2004 Red Hat, Inc.
|
|
*
|
|
* Based on SA1100 version:
|
|
* Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License.
|
|
*
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/pm.h>
|
|
#include <linux/pm_legacy.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/sysctl.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/delay.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
#include <asm/mb86943a.h>
|
|
|
|
#include "local.h"
|
|
|
|
/*
|
|
* Debug macros
|
|
*/
|
|
#define DEBUG
|
|
|
|
int pm_do_suspend(void)
|
|
{
|
|
local_irq_disable();
|
|
|
|
__set_LEDS(0xb1);
|
|
|
|
/* go zzz */
|
|
frv_cpu_suspend(pdm_suspend_mode);
|
|
|
|
__set_LEDS(0xb2);
|
|
|
|
local_irq_enable();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static unsigned long __irq_mask;
|
|
|
|
/*
|
|
* Setup interrupt masks, etc to enable wakeup by power switch
|
|
*/
|
|
static void __default_power_switch_setup(void)
|
|
{
|
|
/* default is to mask all interrupt sources. */
|
|
__irq_mask = *(unsigned long *)0xfeff9820;
|
|
*(unsigned long *)0xfeff9820 = 0xfffe0000;
|
|
}
|
|
|
|
/*
|
|
* Cleanup interrupt masks, etc after wakeup by power switch
|
|
*/
|
|
static void __default_power_switch_cleanup(void)
|
|
{
|
|
*(unsigned long *)0xfeff9820 = __irq_mask;
|
|
}
|
|
|
|
/*
|
|
* Return non-zero if wakeup irq was caused by power switch
|
|
*/
|
|
static int __default_power_switch_check(void)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
void (*__power_switch_wake_setup)(void) = __default_power_switch_setup;
|
|
int (*__power_switch_wake_check)(void) = __default_power_switch_check;
|
|
void (*__power_switch_wake_cleanup)(void) = __default_power_switch_cleanup;
|
|
|
|
int pm_do_bus_sleep(void)
|
|
{
|
|
local_irq_disable();
|
|
|
|
/*
|
|
* Here is where we need some platform-dependent setup
|
|
* of the interrupt state so that appropriate wakeup
|
|
* sources are allowed and all others are masked.
|
|
*/
|
|
__power_switch_wake_setup();
|
|
|
|
__set_LEDS(0xa1);
|
|
|
|
/* go zzz
|
|
*
|
|
* This is in a loop in case power switch shares an irq with other
|
|
* devices. The wake_check() tells us if we need to finish waking
|
|
* or go back to sleep.
|
|
*/
|
|
do {
|
|
frv_cpu_suspend(HSR0_PDM_BUS_SLEEP);
|
|
} while (__power_switch_wake_check && !__power_switch_wake_check());
|
|
|
|
__set_LEDS(0xa2);
|
|
|
|
/*
|
|
* Here is where we need some platform-dependent restore
|
|
* of the interrupt state prior to being called.
|
|
*/
|
|
__power_switch_wake_cleanup();
|
|
|
|
local_irq_enable();
|
|
|
|
return 0;
|
|
}
|
|
|
|
unsigned long sleep_phys_sp(void *sp)
|
|
{
|
|
return virt_to_phys(sp);
|
|
}
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
/*
|
|
* Use a temporary sysctl number. Horrid, but will be cleaned up in 2.6
|
|
* when all the PM interfaces exist nicely.
|
|
*/
|
|
#define CTL_PM_SUSPEND 1
|
|
#define CTL_PM_CMODE 2
|
|
#define CTL_PM_P0 4
|
|
#define CTL_PM_CM 5
|
|
|
|
static int user_atoi(char __user *ubuf, size_t len)
|
|
{
|
|
char buf[16];
|
|
unsigned long ret;
|
|
|
|
if (len > 15)
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(buf, ubuf, len))
|
|
return -EFAULT;
|
|
|
|
buf[len] = 0;
|
|
ret = simple_strtoul(buf, NULL, 0);
|
|
if (ret > INT_MAX)
|
|
return -ERANGE;
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Send us to sleep.
|
|
*/
|
|
static int sysctl_pm_do_suspend(ctl_table *ctl, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *fpos)
|
|
{
|
|
int retval, mode;
|
|
|
|
if (*lenp <= 0)
|
|
return -EIO;
|
|
|
|
mode = user_atoi(buffer, *lenp);
|
|
if ((mode != 1) && (mode != 5))
|
|
return -EINVAL;
|
|
|
|
retval = pm_send_all(PM_SUSPEND, (void *)3);
|
|
|
|
if (retval == 0) {
|
|
if (mode == 5)
|
|
retval = pm_do_bus_sleep();
|
|
else
|
|
retval = pm_do_suspend();
|
|
pm_send_all(PM_RESUME, (void *)0);
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
static int try_set_cmode(int new_cmode)
|
|
{
|
|
if (new_cmode > 15)
|
|
return -EINVAL;
|
|
if (!(clock_cmodes_permitted & (1<<new_cmode)))
|
|
return -EINVAL;
|
|
|
|
/* tell all the drivers we're suspending */
|
|
pm_send_all(PM_SUSPEND, (void *)3);
|
|
|
|
/* now change cmode */
|
|
local_irq_disable();
|
|
frv_dma_pause_all();
|
|
|
|
frv_change_cmode(new_cmode);
|
|
|
|
determine_clocks(0);
|
|
time_divisor_init();
|
|
|
|
#ifdef DEBUG
|
|
determine_clocks(1);
|
|
#endif
|
|
frv_dma_resume_all();
|
|
local_irq_enable();
|
|
|
|
/* tell all the drivers we're resuming */
|
|
pm_send_all(PM_RESUME, (void *)0);
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int cmode_procctl(ctl_table *ctl, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *fpos)
|
|
{
|
|
int new_cmode;
|
|
|
|
if (!write)
|
|
return proc_dointvec(ctl, write, filp, buffer, lenp, fpos);
|
|
|
|
new_cmode = user_atoi(buffer, *lenp);
|
|
|
|
return try_set_cmode(new_cmode)?:*lenp;
|
|
}
|
|
|
|
static int cmode_sysctl(ctl_table *table, int __user *name, int nlen,
|
|
void __user *oldval, size_t __user *oldlenp,
|
|
void __user *newval, size_t newlen)
|
|
{
|
|
if (oldval && oldlenp) {
|
|
size_t oldlen;
|
|
|
|
if (get_user(oldlen, oldlenp))
|
|
return -EFAULT;
|
|
|
|
if (oldlen != sizeof(int))
|
|
return -EINVAL;
|
|
|
|
if (put_user(clock_cmode_current, (unsigned __user *)oldval) ||
|
|
put_user(sizeof(int), oldlenp))
|
|
return -EFAULT;
|
|
}
|
|
if (newval && newlen) {
|
|
int new_cmode;
|
|
|
|
if (newlen != sizeof(int))
|
|
return -EINVAL;
|
|
|
|
if (get_user(new_cmode, (int __user *)newval))
|
|
return -EFAULT;
|
|
|
|
return try_set_cmode(new_cmode)?:1;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int try_set_p0(int new_p0)
|
|
{
|
|
unsigned long flags, clkc;
|
|
|
|
if (new_p0 < 0 || new_p0 > 1)
|
|
return -EINVAL;
|
|
|
|
local_irq_save(flags);
|
|
__set_PSR(flags & ~PSR_ET);
|
|
|
|
frv_dma_pause_all();
|
|
|
|
clkc = __get_CLKC();
|
|
if (new_p0)
|
|
clkc |= CLKC_P0;
|
|
else
|
|
clkc &= ~CLKC_P0;
|
|
__set_CLKC(clkc);
|
|
|
|
determine_clocks(0);
|
|
time_divisor_init();
|
|
|
|
#ifdef DEBUG
|
|
determine_clocks(1);
|
|
#endif
|
|
frv_dma_resume_all();
|
|
local_irq_restore(flags);
|
|
return 0;
|
|
}
|
|
|
|
static int try_set_cm(int new_cm)
|
|
{
|
|
unsigned long flags, clkc;
|
|
|
|
if (new_cm < 0 || new_cm > 1)
|
|
return -EINVAL;
|
|
|
|
local_irq_save(flags);
|
|
__set_PSR(flags & ~PSR_ET);
|
|
|
|
frv_dma_pause_all();
|
|
|
|
clkc = __get_CLKC();
|
|
clkc &= ~CLKC_CM;
|
|
clkc |= new_cm;
|
|
__set_CLKC(clkc);
|
|
|
|
determine_clocks(0);
|
|
time_divisor_init();
|
|
|
|
#if 1 //def DEBUG
|
|
determine_clocks(1);
|
|
#endif
|
|
|
|
frv_dma_resume_all();
|
|
local_irq_restore(flags);
|
|
return 0;
|
|
}
|
|
|
|
static int p0_procctl(ctl_table *ctl, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *fpos)
|
|
{
|
|
int new_p0;
|
|
|
|
if (!write)
|
|
return proc_dointvec(ctl, write, filp, buffer, lenp, fpos);
|
|
|
|
new_p0 = user_atoi(buffer, *lenp);
|
|
|
|
return try_set_p0(new_p0)?:*lenp;
|
|
}
|
|
|
|
static int p0_sysctl(ctl_table *table, int __user *name, int nlen,
|
|
void __user *oldval, size_t __user *oldlenp,
|
|
void __user *newval, size_t newlen)
|
|
{
|
|
if (oldval && oldlenp) {
|
|
size_t oldlen;
|
|
|
|
if (get_user(oldlen, oldlenp))
|
|
return -EFAULT;
|
|
|
|
if (oldlen != sizeof(int))
|
|
return -EINVAL;
|
|
|
|
if (put_user(clock_p0_current, (unsigned __user *)oldval) ||
|
|
put_user(sizeof(int), oldlenp))
|
|
return -EFAULT;
|
|
}
|
|
if (newval && newlen) {
|
|
int new_p0;
|
|
|
|
if (newlen != sizeof(int))
|
|
return -EINVAL;
|
|
|
|
if (get_user(new_p0, (int __user *)newval))
|
|
return -EFAULT;
|
|
|
|
return try_set_p0(new_p0)?:1;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int cm_procctl(ctl_table *ctl, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *fpos)
|
|
{
|
|
int new_cm;
|
|
|
|
if (!write)
|
|
return proc_dointvec(ctl, write, filp, buffer, lenp, fpos);
|
|
|
|
new_cm = user_atoi(buffer, *lenp);
|
|
|
|
return try_set_cm(new_cm)?:*lenp;
|
|
}
|
|
|
|
static int cm_sysctl(ctl_table *table, int __user *name, int nlen,
|
|
void __user *oldval, size_t __user *oldlenp,
|
|
void __user *newval, size_t newlen)
|
|
{
|
|
if (oldval && oldlenp) {
|
|
size_t oldlen;
|
|
|
|
if (get_user(oldlen, oldlenp))
|
|
return -EFAULT;
|
|
|
|
if (oldlen != sizeof(int))
|
|
return -EINVAL;
|
|
|
|
if (put_user(clock_cm_current, (unsigned __user *)oldval) ||
|
|
put_user(sizeof(int), oldlenp))
|
|
return -EFAULT;
|
|
}
|
|
if (newval && newlen) {
|
|
int new_cm;
|
|
|
|
if (newlen != sizeof(int))
|
|
return -EINVAL;
|
|
|
|
if (get_user(new_cm, (int __user *)newval))
|
|
return -EFAULT;
|
|
|
|
return try_set_cm(new_cm)?:1;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
|
|
static struct ctl_table pm_table[] =
|
|
{
|
|
{
|
|
.ctl_name = CTL_PM_SUSPEND,
|
|
.procname = "suspend",
|
|
.data = NULL,
|
|
.maxlen = 0,
|
|
.mode = 0200,
|
|
.proc_handler = &sysctl_pm_do_suspend,
|
|
},
|
|
{
|
|
.ctl_name = CTL_PM_CMODE,
|
|
.procname = "cmode",
|
|
.data = &clock_cmode_current,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &cmode_procctl,
|
|
.strategy = &cmode_sysctl,
|
|
},
|
|
{
|
|
.ctl_name = CTL_PM_P0,
|
|
.procname = "p0",
|
|
.data = &clock_p0_current,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &p0_procctl,
|
|
.strategy = &p0_sysctl,
|
|
},
|
|
{
|
|
.ctl_name = CTL_PM_CM,
|
|
.procname = "cm",
|
|
.data = &clock_cm_current,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &cm_procctl,
|
|
.strategy = &cm_sysctl,
|
|
},
|
|
{ .ctl_name = 0}
|
|
};
|
|
|
|
static struct ctl_table pm_dir_table[] =
|
|
{
|
|
{
|
|
.ctl_name = CTL_PM,
|
|
.procname = "pm",
|
|
.mode = 0555,
|
|
.child = pm_table,
|
|
},
|
|
{ .ctl_name = 0}
|
|
};
|
|
|
|
/*
|
|
* Initialize power interface
|
|
*/
|
|
static int __init pm_init(void)
|
|
{
|
|
register_sysctl_table(pm_dir_table);
|
|
return 0;
|
|
}
|
|
|
|
__initcall(pm_init);
|
|
|
|
#endif
|