mirror of
https://github.com/torvalds/linux.git
synced 2024-11-18 01:51:53 +00:00
895d3b53fd
Add the lighest possible sleep mode on Cortex-A9 cores: CPU sleep. It is entered by a simple dsb and wfi instruction via cpu_do_idle(). As just clocks are stopped there is no need to save or restore any state of the system. Signed-off-by: Bastian Hecht <hechtb+renesas@gmail.com> Acked-by: Magnus Damm <damm@opensource.se> [ horms@verge.net.au: Added missing includes ] Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
83 lines
1.8 KiB
C
83 lines
1.8 KiB
C
/*
|
|
* r8a7740 power management support
|
|
*
|
|
* Copyright (C) 2012 Renesas Solutions Corp.
|
|
* Copyright (C) 2012 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
#include <linux/console.h>
|
|
#include <linux/suspend.h>
|
|
#include <mach/pm-rmobile.h>
|
|
#include <mach/common.h>
|
|
|
|
#ifdef CONFIG_PM
|
|
static int r8a7740_pd_a4s_suspend(void)
|
|
{
|
|
/*
|
|
* The A4S domain contains the CPU core and therefore it should
|
|
* only be turned off if the CPU is in use.
|
|
*/
|
|
return -EBUSY;
|
|
}
|
|
|
|
static int r8a7740_pd_a3sp_suspend(void)
|
|
{
|
|
/*
|
|
* Serial consoles make use of SCIF hardware located in A3SP,
|
|
* keep such power domain on if "no_console_suspend" is set.
|
|
*/
|
|
return console_suspend_enabled ? 0 : -EBUSY;
|
|
}
|
|
|
|
static struct rmobile_pm_domain r8a7740_pm_domains[] = {
|
|
{
|
|
.genpd.name = "A4S",
|
|
.bit_shift = 10,
|
|
.gov = &pm_domain_always_on_gov,
|
|
.no_debug = true,
|
|
.suspend = r8a7740_pd_a4s_suspend,
|
|
},
|
|
{
|
|
.genpd.name = "A3SP",
|
|
.bit_shift = 11,
|
|
.gov = &pm_domain_always_on_gov,
|
|
.no_debug = true,
|
|
.suspend = r8a7740_pd_a3sp_suspend,
|
|
},
|
|
{
|
|
.genpd.name = "A4LC",
|
|
.bit_shift = 1,
|
|
},
|
|
};
|
|
|
|
void __init r8a7740_init_pm_domains(void)
|
|
{
|
|
rmobile_init_domains(r8a7740_pm_domains, ARRAY_SIZE(r8a7740_pm_domains));
|
|
pm_genpd_add_subdomain_names("A4S", "A3SP");
|
|
}
|
|
|
|
#endif /* CONFIG_PM */
|
|
|
|
#ifdef CONFIG_SUSPEND
|
|
static int r8a7740_enter_suspend(suspend_state_t suspend_state)
|
|
{
|
|
cpu_do_idle();
|
|
return 0;
|
|
}
|
|
|
|
static void r8a7740_suspend_init(void)
|
|
{
|
|
shmobile_suspend_ops.enter = r8a7740_enter_suspend;
|
|
}
|
|
#else
|
|
static void r8a7740_suspend_init(void) {}
|
|
#endif
|
|
|
|
void __init r8a7740_pm_init(void)
|
|
{
|
|
r8a7740_suspend_init();
|
|
}
|