arch/arm/plat-omap/include/plat/mailbox.h

   1 /* mailbox.h */
   2
   3 #ifndef MAILBOX_H
   4 #define MAILBOX_H
   5
   6 #include <linux/spinlock.h>
   7 #include <linux/workqueue.h>
   8 #include <linux/interrupt.h>
   9 #include <linux/device.h>
  10 #include <linux/kfifo.h>
  11
  12 typedef u32 mbox_msg_t;
  13 struct omap_mbox;
  14
  15 typedef int __bitwise omap_mbox_irq_t;
  16 #define IRQ_TX ((__force omap_mbox_irq_t) 1)
  17 #define IRQ_RX ((__force omap_mbox_irq_t) 2)
  18
  19 typedef int __bitwise omap_mbox_type_t;
  20 #define OMAP_MBOX_TYPE1 ((__force omap_mbox_type_t) 1)
  21 #define OMAP_MBOX_TYPE2 ((__force omap_mbox_type_t) 2)
  22
  23 struct omap_mbox_ops {
  24         omap_mbox_type_t        type;
  25         int             (*startup)(struct omap_mbox *mbox);
  26         void            (*shutdown)(struct omap_mbox *mbox);
  27         /* fifo */
  28         mbox_msg_t      (*fifo_read)(struct omap_mbox *mbox);
  29         void            (*fifo_write)(struct omap_mbox *mbox, mbox_msg_t msg);
  30         int             (*fifo_empty)(struct omap_mbox *mbox);
  31         int             (*fifo_full)(struct omap_mbox *mbox);
  32         /* irq */
  33         void            (*enable_irq)(struct omap_mbox *mbox,
  34                                                 omap_mbox_irq_t irq);
  35         void            (*disable_irq)(struct omap_mbox *mbox,
  36                                                 omap_mbox_irq_t irq);
  37         void            (*ack_irq)(struct omap_mbox *mbox, omap_mbox_irq_t irq);
  38         int             (*is_irq)(struct omap_mbox *mbox, omap_mbox_irq_t irq);
  39         /* ctx */
  40         void            (*save_ctx)(struct omap_mbox *mbox);
  41         void            (*restore_ctx)(struct omap_mbox *mbox);
  42 };
  43
  44 struct omap_mbox_queue {
  45         spinlock_t              lock;
  46         struct kfifo            fifo;
  47         struct work_struct      work;
  48         struct tasklet_struct   tasklet;
  49         struct omap_mbox        *mbox;
  50         bool full;
  51 };
  52
  53 struct omap_mbox {
  54         char                    *name;
  55         unsigned int            irq;
  56         struct omap_mbox_queue  *txq, *rxq;
  57         struct omap_mbox_ops    *ops;
  58         struct device           *dev;
  59         void                    *priv;
  60         int                     use_count;
  61         struct blocking_notifier_head   notifier;
  62 };
  63
  64 int omap_mbox_msg_send(struct omap_mbox *, mbox_msg_t msg);
  65 void omap_mbox_init_seq(struct omap_mbox *);
  66
  67 struct omap_mbox *omap_mbox_get(const char *, struct notifier_block *nb);
  68 void omap_mbox_put(struct omap_mbox *mbox, struct notifier_block *nb);
  69
  70 int omap_mbox_register(struct device *parent, struct omap_mbox **);
  71 int omap_mbox_unregister(void);
  72
  73 static inline void omap_mbox_save_ctx(struct omap_mbox *mbox)
  74 {
  75         if (!mbox->ops->save_ctx) {
  76                 dev_err(mbox->dev, "%s:\tno save\n", __func__);
  77                 return;
  78         }
  79
  80         mbox->ops->save_ctx(mbox);
  81 }
  82
  83 static inline void omap_mbox_restore_ctx(struct omap_mbox *mbox)
  84 {
  85         if (!mbox->ops->restore_ctx) {
  86                 dev_err(mbox->dev, "%s:\tno restore\n", __func__);
  87                 return;
  88         }
  89
  90         mbox->ops->restore_ctx(mbox);
  91 }
  92
  93 static inline void omap_mbox_enable_irq(struct omap_mbox *mbox,
  94                                         omap_mbox_irq_t irq)
  95 {
  96         mbox->ops->enable_irq(mbox, irq);
  97 }
  98
  99 static inline void omap_mbox_disable_irq(struct omap_mbox *mbox,
 100                                          omap_mbox_irq_t irq)
 101 {
 102         mbox->ops->disable_irq(mbox, irq);
 103 }
 104
 105 #endif /* MAILBOX_H */