omap mailbox: add save_/restore_ctx() for PM

To preserve the registers during off-mode

Signed-off-by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>

diff --git a/arch/arm/mach-omap2/mailbox.c b/arch/arm/mach-omap2/mailbox.c
index 01d5f42f2d2dcc565c740e49cdefe6d315870d79..571aea7166aaf6bc6219b1cfb7f22436e8d314cb 100644 (file)
--- a/arch/arm/mach-omap2/mailbox.c
+++ b/arch/arm/mach-omap2/mailbox.c
@@ -32,6 +32,8 @@
 #define MAILBOX_IRQ_NEWMSG(u)          (1 << (2 * (u)))
 #define MAILBOX_IRQ_NOTFULL(u)         (1 << (2 * (u) + 1))
 
+#define MBOX_REG_SIZE                  0x120
+
 static void __iomem *mbox_base;
 
 struct omap_mbox2_fifo {
@@ -47,6 +49,7 @@ struct omap_mbox2_priv {
        unsigned long irqstatus;
        u32 newmsg_bit;
        u32 notfull_bit;
+       char ctx[MBOX_REG_SIZE];
 };
 
 static struct clk *mbox_ick_handle;
@@ -167,6 +170,36 @@ 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_REG_SIZE; i += sizeof(u32)) {
+               u32 val;
+
+               val = mbox_read_reg(i);
+               *(u32 *)(p->ctx + i) = val;
+
+               dev_dbg(mbox->dev, "%s\t[%02d] %08x\n", __func__, i, val);
+       }
+}
+
+static void omap2_mbox_restore_ctx(struct omap_mbox *mbox)
+{
+       int i;
+       struct omap_mbox2_priv *p = mbox->priv;
+
+       for (i = 0; i < MBOX_REG_SIZE; i += sizeof(u32)) {
+               u32 val;
+
+               val = *(u32 *)(p->ctx + i);
+               mbox_write_reg(val, i);
+
+               dev_dbg(mbox->dev, "%s\t[%02d] %08x\n", __func__, i, val);
+       }
+}
+
 static struct omap_mbox_ops omap2_mbox_ops = {
        .type           = OMAP_MBOX_TYPE2,
        .startup        = omap2_mbox_startup,
@@ -179,6 +212,8 @@ 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,
 };
 
 /*

diff --git a/arch/arm/plat-omap/include/mach/mailbox.h b/arch/arm/plat-omap/include/mach/mailbox.h
index 577db6852f436be1a52400aff5abcc9561ae7eb8..b7a6991814ec166c403266d58152d323530ca481 100644 (file)
--- a/arch/arm/plat-omap/include/mach/mailbox.h
+++ b/arch/arm/plat-omap/include/mach/mailbox.h
@@ -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 */