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mailbox.h

/*
 * Mailbox internal functions
 *
 * Copyright (C) 2006 Nokia Corporation
 * Written by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#ifndef __ARCH_ARM_PLAT_MAILBOX_H
#define __ARCH_ARM_PLAT_MAILBOX_H

/*
 * Mailbox sequence bit API
 */
#if defined(CONFIG_ARCH_OMAP1)
#  define MBOX_USE_SEQ_BIT
#elif defined(CONFIG_ARCH_OMAP2)
#  define MBOX_USE_SEQ_BIT
#endif

#ifdef MBOX_USE_SEQ_BIT
/* seq_rcv should be initialized with any value other than
 * 0 and 1 << 31, to allow either value for the first
 * message.  */
static inline void mbox_seq_init(struct omap_mbox *mbox)
{
      /* any value other than 0 and 1 << 31 */
      mbox->seq_rcv = 0xffffffff;
}

static inline void mbox_seq_toggle(struct omap_mbox *mbox, mbox_msg_t * msg)
{
      /* add seq_snd to msg */
      *msg = (*msg & 0x7fffffff) | mbox->seq_snd;
      /* flip seq_snd */
      mbox->seq_snd ^= 1 << 31;
}

static inline int mbox_seq_test(struct omap_mbox *mbox, mbox_msg_t msg)
{
      mbox_msg_t seq = msg & (1 << 31);
      if (seq == mbox->seq_rcv)
            return -1;
      mbox->seq_rcv = seq;
      return 0;
}
#else
static inline void mbox_seq_init(struct omap_mbox *mbox)
{
}
static inline void mbox_seq_toggle(struct omap_mbox *mbox, mbox_msg_t * msg)
{
}
static inline int mbox_seq_test(struct omap_mbox *mbox, mbox_msg_t msg)
{
      return 0;
}
#endif

/* Mailbox FIFO handle functions */
static inline mbox_msg_t mbox_fifo_read(struct omap_mbox *mbox)
{
      return mbox->ops->fifo_read(mbox);
}
static inline void mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
{
      mbox->ops->fifo_write(mbox, msg);
}
static inline int mbox_fifo_empty(struct omap_mbox *mbox)
{
      return mbox->ops->fifo_empty(mbox);
}
static inline int mbox_fifo_full(struct omap_mbox *mbox)
{
      return mbox->ops->fifo_full(mbox);
}

/* Mailbox IRQ handle functions */
static inline void enable_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
{
      mbox->ops->enable_irq(mbox, irq);
}
static inline void disable_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
{
      mbox->ops->disable_irq(mbox, irq);
}
static inline void ack_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
{
      if (mbox->ops->ack_irq)
            mbox->ops->ack_irq(mbox, irq);
}
static inline int is_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
{
      return mbox->ops->is_irq(mbox, irq);
}

#endif                        /* __ARCH_ARM_PLAT_MAILBOX_H */

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