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mailbox.h

/* mailbox.h */

#ifndef MAILBOX_H
#define MAILBOX_H

#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/kfifo.h>

typedef u32 mbox_msg_t;
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)

00023 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);
      /* ctx */
      void        (*save_ctx)(struct omap_mbox *mbox);
      void        (*restore_ctx)(struct omap_mbox *mbox);
};

00044 struct omap_mbox_queue {
      spinlock_t        lock;
      struct kfifo            fifo;
      struct work_struct      work;
      struct tasklet_struct   tasklet;
      struct omap_mbox  *mbox;
      bool full;
};

00053 struct omap_mbox {
      char              *name;
      unsigned int            irq;
      struct omap_mbox_queue  *txq, *rxq;
      struct omap_mbox_ops    *ops;
      struct device           *dev;
      void              *priv;
      int               use_count;
      struct blocking_notifier_head   notifier;
};

int omap_mbox_msg_send(struct omap_mbox *, mbox_msg_t msg);
void omap_mbox_init_seq(struct omap_mbox *);

struct omap_mbox *omap_mbox_get(const char *, struct notifier_block *nb);
void omap_mbox_put(struct omap_mbox *mbox, struct notifier_block *nb);

int omap_mbox_register(struct device *parent, struct omap_mbox **);
int omap_mbox_unregister(void);

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);
}

static inline void omap_mbox_enable_irq(struct omap_mbox *mbox,
                              omap_mbox_irq_t irq)
{
      mbox->ops->enable_irq(mbox, irq);
}

static inline void omap_mbox_disable_irq(struct omap_mbox *mbox,
                               omap_mbox_irq_t irq)
{
      mbox->ops->disable_irq(mbox, irq);
}

#endif /* MAILBOX_H */

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