omap mailbox: add save_/restore_ctx() for PM

To preserve the registers during off-mode

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

2 files changed, 55 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/mailbox.c b/arch/arm/mach-omap2/mailbox.c
index 0b8476ba95fd..fd5b8a5925cc 100644
--- a/arch/arm/mach-omap2/mailbox.c
+++ b/arch/arm/mach-omap2/mailbox.c
@@ -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,
 };
 
 /*
diff --git a/arch/arm/plat-omap/include/mach/mailbox.h b/arch/arm/plat-omap/include/mach/mailbox.h
index 577db6852f43..b7a6991814ec 100644
--- 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 */