arch/arm/plat-omap/mailbox.h

   1 /*
   2  * Mailbox internal functions
   3  *
   4  * Copyright (C) 2006 Nokia Corporation
   5  * Written by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
   6  *
   7  * This file is subject to the terms and conditions of the GNU General Public
   8  * License.  See the file "COPYING" in the main directory of this archive
   9  * for more details.
  10  */
  11
  12 #ifndef __ARCH_ARM_PLAT_MAILBOX_H
  13 #define __ARCH_ARM_PLAT_MAILBOX_H
  14
  15 /*
  16  * Mailbox sequence bit API
  17  */
  18 #if defined(CONFIG_ARCH_OMAP1)
  19 #  define MBOX_USE_SEQ_BIT
  20 #elif defined(CONFIG_ARCH_OMAP2)
  21 #  define MBOX_USE_SEQ_BIT
  22 #endif
  23
  24 #ifdef MBOX_USE_SEQ_BIT
  25 /* seq_rcv should be initialized with any value other than
  26  * 0 and 1 << 31, to allow either value for the first
  27  * message.  */
  28 static inline void mbox_seq_init(struct omap_mbox *mbox)
  29 {
  30         /* any value other than 0 and 1 << 31 */
  31         mbox->seq_rcv = 0xffffffff;
  32 }
  33
  34 static inline void mbox_seq_toggle(struct omap_mbox *mbox, mbox_msg_t * msg)
  35 {
  36         /* add seq_snd to msg */
  37         *msg = (*msg & 0x7fffffff) | mbox->seq_snd;
  38         /* flip seq_snd */
  39         mbox->seq_snd ^= 1 << 31;
  40 }
  41
  42 static inline int mbox_seq_test(struct omap_mbox *mbox, mbox_msg_t msg)
  43 {
  44         mbox_msg_t seq = msg & (1 << 31);
  45         if (seq == mbox->seq_rcv)
  46                 return -1;
  47         mbox->seq_rcv = seq;
  48         return 0;
  49 }
  50 #else
  51 static inline void mbox_seq_init(struct omap_mbox *mbox)
  52 {
  53 }
  54 static inline void mbox_seq_toggle(struct omap_mbox *mbox, mbox_msg_t * msg)
  55 {
  56 }
  57 static inline int mbox_seq_test(struct omap_mbox *mbox, mbox_msg_t msg)
  58 {
  59         return 0;
  60 }
  61 #endif
  62
  63 /* Mailbox FIFO handle functions */
  64 static inline mbox_msg_t mbox_fifo_read(struct omap_mbox *mbox)
  65 {
  66         return mbox->ops->fifo_read(mbox);
  67 }
  68 static inline void mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
  69 {
  70         mbox->ops->fifo_write(mbox, msg);
  71 }
  72 static inline int mbox_fifo_empty(struct omap_mbox *mbox)
  73 {
  74         return mbox->ops->fifo_empty(mbox);
  75 }
  76 static inline int mbox_fifo_full(struct omap_mbox *mbox)
  77 {
  78         return mbox->ops->fifo_full(mbox);
  79 }
  80
  81 /* Mailbox IRQ handle functions */
  82 static inline void enable_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
  83 {
  84         mbox->ops->enable_irq(mbox, irq);
  85 }
  86 static inline void disable_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
  87 {
  88         mbox->ops->disable_irq(mbox, irq);
  89 }
  90 static inline void ack_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
  91 {
  92         if (mbox->ops->ack_irq)
  93                 mbox->ops->ack_irq(mbox, irq);
  94 }
  95 static inline int is_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
  96 {
  97         return mbox->ops->is_irq(mbox, irq);
  98 }
  99
 100 #endif                          /* __ARCH_ARM_PLAT_MAILBOX_H */