diff options
| author | Francesco VIRLINZI <francesco.virlinzi@st.com> | 2009-03-11 11:39:02 +0100 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2009-03-16 11:46:17 +0100 |
| commit | a83c0b739f3ad1887704cfa9f1ee5ee208cf1532 (patch) | |
| tree | 213fac95be0a7215a2f381c421b93bc1466e08a2 /arch/sh/mm/pmb.c | |
| parent | sh: Revert CONFIG_NR_ONCHIP_DMA_CHANNELS to MAX_DMA_CHANNELS (diff) | |
| download | linux-a83c0b739f3ad1887704cfa9f1ee5ee208cf1532.tar.xz linux-a83c0b739f3ad1887704cfa9f1ee5ee208cf1532.zip | |
sh: PMB hibernation support
This implements preliminary suspend/resume support for the PMB.
Signed-off-by: Francesco Virlinzi <francesco.virlinzi@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/mm/pmb.c')
| -rw-r--r-- | arch/sh/mm/pmb.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/sh/mm/pmb.c b/arch/sh/mm/pmb.c index 84241676265e..b1a714a92b14 100644 --- a/arch/sh/mm/pmb.c +++ b/arch/sh/mm/pmb.c @@ -15,6 +15,8 @@ */ #include <linux/init.h> #include <linux/kernel.h> +#include <linux/sysdev.h> +#include <linux/cpu.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/bitops.h> @@ -402,3 +404,39 @@ static int __init pmb_debugfs_init(void) return 0; } postcore_initcall(pmb_debugfs_init); + +#ifdef CONFIG_PM +static int pmb_sysdev_suspend(struct sys_device *dev, pm_message_t state) +{ + static pm_message_t prev_state; + + /* Restore the PMB after a resume from hibernation */ + if (state.event == PM_EVENT_ON && + prev_state.event == PM_EVENT_FREEZE) { + struct pmb_entry *pmbe; + spin_lock_irq(&pmb_list_lock); + for (pmbe = pmb_list; pmbe; pmbe = pmbe->next) + set_pmb_entry(pmbe); + spin_unlock_irq(&pmb_list_lock); + } + prev_state = state; + return 0; +} + +static int pmb_sysdev_resume(struct sys_device *dev) +{ + return pmb_sysdev_suspend(dev, PMSG_ON); +} + +static struct sysdev_driver pmb_sysdev_driver = { + .suspend = pmb_sysdev_suspend, + .resume = pmb_sysdev_resume, +}; + +static int __init pmb_sysdev_init(void) +{ + return sysdev_driver_register(&cpu_sysdev_class, &pmb_sysdev_driver); +} + +subsys_initcall(pmb_sysdev_init); +#endif |