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authorFrancesco VIRLINZI <francesco.virlinzi@st.com>2009-03-11 11:39:02 +0100
committerPaul Mundt <lethal@linux-sh.org>2009-03-16 11:46:17 +0100
commita83c0b739f3ad1887704cfa9f1ee5ee208cf1532 (patch)
tree213fac95be0a7215a2f381c421b93bc1466e08a2 /arch/sh
parentsh: Revert CONFIG_NR_ONCHIP_DMA_CHANNELS to MAX_DMA_CHANNELS (diff)
downloadlinux-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')
-rw-r--r--arch/sh/mm/pmb.c38
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