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TOMOYO Linux Cross Reference
Linux/arch/arm/plat-omap/include/plat/mailbox.h

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  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 */
106 

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