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omap mailbox: add save_/restore_ctx() for PM 

To preserve the registers during off-mode

Signed-off-by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
This commit is contained in:
Hiroshi DOYU 2009-03-23 18:07:26 -07:00 committed by Tony Lindgren
parent da8cfe03a4
commit c75ee7520b
2 changed files with 55 additions and 0 deletions
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32
arch/arm/mach-omap2/mailbox.c
View File

@ -30,6 +30,9 @@
#define MAILBOX_IRQ_NEWMSG(u) (1 << (2 * (u)))
#define MAILBOX_IRQ_NOTFULL(u) (1 << (2 * (u) + 1))
#define MBOX_REG_SIZE 0x120
#define MBOX_NR_REGS (MBOX_REG_SIZE / sizeof(u32))
static void __iomem *mbox_base;
struct omap_mbox2_fifo {
@ -45,6 +48,7 @@ struct omap_mbox2_priv {
unsigned long irqstatus;
u32 newmsg_bit;
u32 notfull_bit;
u32 ctx[MBOX_NR_REGS];
};
static struct clk *mbox_ick_handle;
@ -165,6 +169,32 @@ static int omap2_mbox_is_irq(struct omap_mbox *mbox,
return (enable & status & bit);
}
static void omap2_mbox_save_ctx(struct omap_mbox *mbox)
{
int i;
struct omap_mbox2_priv *p = mbox->priv;
for (i = 0; i < MBOX_NR_REGS; i++) {
p->ctx[i] = mbox_read_reg(i * sizeof(u32));
dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,
i, p->ctx[i]);
}
}
static void omap2_mbox_restore_ctx(struct omap_mbox *mbox)
{
int i;
struct omap_mbox2_priv *p = mbox->priv;
for (i = 0; i < MBOX_NR_REGS; i++) {
mbox_write_reg(p->ctx[i], i * sizeof(u32));
dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,
i, p->ctx[i]);
}
}
static struct omap_mbox_ops omap2_mbox_ops = {
.type = OMAP_MBOX_TYPE2,
.startup = omap2_mbox_startup,
@ -177,6 +207,8 @@ static struct omap_mbox_ops omap2_mbox_ops = {
.disable_irq = omap2_mbox_disable_irq,
.ack_irq = omap2_mbox_ack_irq,
.is_irq = omap2_mbox_is_irq,
.save_ctx = omap2_mbox_save_ctx,
.restore_ctx = omap2_mbox_restore_ctx,
};
/*

23
arch/arm/plat-omap/include/mach/mailbox.h
View File

@ -33,6 +33,9 @@ struct omap_mbox_ops {
void (*disable_irq)(struct omap_mbox *mbox, omap_mbox_irq_t irq);
void (*ack_irq)(struct omap_mbox *mbox, omap_mbox_irq_t irq);
int (*is_irq)(struct omap_mbox *mbox, omap_mbox_irq_t irq);
/* ctx */
void (*save_ctx)(struct omap_mbox *mbox);
void (*restore_ctx)(struct omap_mbox *mbox);
};
struct omap_mbox_queue {
@ -70,4 +73,24 @@ void omap_mbox_put(struct omap_mbox *);
int omap_mbox_register(struct device *parent, struct omap_mbox *);
int omap_mbox_unregister(struct omap_mbox *);
static inline void omap_mbox_save_ctx(struct omap_mbox *mbox)
{
if (!mbox->ops->save_ctx) {
dev_err(mbox->dev, "%s:\tno save\n", __func__);
return;
}
mbox->ops->save_ctx(mbox);
}
static inline void omap_mbox_restore_ctx(struct omap_mbox *mbox)
{
if (!mbox->ops->restore_ctx) {
dev_err(mbox->dev, "%s:\tno restore\n", __func__);
return;
}
mbox->ops->restore_ctx(mbox);
}
#endif /* MAILBOX_H */