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Date: Fri, 16 Jan 2009 10:27:37 +0200
From: Hiroshi DOYU <Hiroshi.DOYU@...ia.com>
To: linux-kernel@...r.kernel.org
Cc: linux-arm-kernel@...ts.arm.linux.org.uk, linux-omap@...r.kernel.org
Subject: [PATCH 07/10] omap mailbox: add save_/restore_ctx() for PM
To preserve the registers during off-mode
Signed-off-by: Hiroshi DOYU <Hiroshi.DOYU@...ia.com>
---
arch/arm/mach-omap2/mailbox.c | 35 +++++++++++++++++++++++++++++
arch/arm/plat-omap/include/mach/mailbox.h | 23 +++++++++++++++++++
2 files changed, 58 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-omap2/mailbox.c b/arch/arm/mach-omap2/mailbox.c
index a877305..544dde9 100644
--- 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 577db68..b7a6991 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 */
--
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