ARM: OMAP: Add mailbox support for IVA

This patch adds a generic mailbox interface for for DSP and IVA
(Image Video Accelerator). This patch itself doesn't contain
any IVA driver.

Signed-off-by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
Signed-off-by: Juha Yrjola <juha.yrjola@solidboot.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 73 insertions, 0 deletions

diff --git a/include/asm-arm/arch-omap/mailbox.h b/include/asm-arm/arch-omap/mailbox.h
new file mode 100644
index 00000000000..4bf0909461f
--- /dev/null
+++ b/include/asm-arm/arch-omap/mailbox.h
@@ -0,0 +1,73 @@
+/* mailbox.h */
+
+#ifndef MAILBOX_H
+#define MAILBOX_H
+
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+#include <linux/blkdev.h>
+
+typedef u32 mbox_msg_t;
+typedef void (mbox_receiver_t)(mbox_msg_t msg);
+struct omap_mbox;
+
+typedef int __bitwise omap_mbox_irq_t;
+#define IRQ_TX ((__force omap_mbox_irq_t) 1)
+#define IRQ_RX ((__force omap_mbox_irq_t) 2)
+
+typedef int __bitwise omap_mbox_type_t;
+#define OMAP_MBOX_TYPE1 ((__force omap_mbox_type_t) 1)
+#define OMAP_MBOX_TYPE2 ((__force omap_mbox_type_t) 2)
+
+struct omap_mbox_ops {
+        omap_mbox_type_t        type;
+        int             (*startup)(struct omap_mbox *mbox);
+        void            (*shutdown)(struct omap_mbox *mbox);
+        /* fifo */
+        mbox_msg_t      (*fifo_read)(struct omap_mbox *mbox);
+        void            (*fifo_write)(struct omap_mbox *mbox, mbox_msg_t msg);
+        int             (*fifo_empty)(struct omap_mbox *mbox);
+        int             (*fifo_full)(struct omap_mbox *mbox);
+        /* irq */
+        void            (*enable_irq)(struct omap_mbox *mbox, omap_mbox_irq_t irq);
+        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);
+};
+
+struct omap_mbox_queue {
+        spinlock_t              lock;
+        request_queue_t         *queue;
+        struct work_struct      work;
+        int     (*callback)(void *);
+        struct omap_mbox        *mbox;
+};
+
+struct omap_mbox {
+        char                    *name;
+        unsigned int            irq;
+
+        struct omap_mbox_queue  *txq, *rxq;
+
+        struct omap_mbox_ops    *ops;
+
+        mbox_msg_t              seq_snd, seq_rcv;
+
+        struct device           dev;
+
+        struct omap_mbox        *next;
+        void                    *priv;
+
+        void                    (*err_notify)(void);
+};
+
+int omap_mbox_msg_send(struct omap_mbox *, mbox_msg_t msg, void *);
+void omap_mbox_init_seq(struct omap_mbox *);
+
+struct omap_mbox *omap_mbox_get(const char *);
+void omap_mbox_put(struct omap_mbox *);
+
+int omap_mbox_register(struct omap_mbox *);
+int omap_mbox_unregister(struct omap_mbox *);
+
+#endif /* MAILBOX_H */