arch/arm/mach-ux500/include/mach/mbox-db5500.h

   1 /*
   2  * Copyright (C) ST-Ericsson SA 2010
   3  * Author: Stefan Nilsson <stefan.xk.nilsson@stericsson.com> for ST-Ericsson.
   4  * Author: Martin Persson <martin.persson@stericsson.com> for ST-Ericsson.
   5  * License terms: GNU General Public License (GPL), version 2.
   6  */
   7
   8 #ifndef __INC_STE_MBOX_H
   9 #define __INC_STE_MBOX_H
  10
  11 #define MBOX_BUF_SIZE 16
  12 #define MBOX_NAME_SIZE 8
  13
  14 /**
  15   * mbox_recv_cb_t - Definition of the mailbox callback.
  16   * @mbox_msg:  The mailbox message.
  17   * @priv:      The clients private data as specified in the call to mbox_setup.
  18   *
  19   * This function will be called upon reception of new mailbox messages.
  20   */
  21 typedef void mbox_recv_cb_t (u32 mbox_msg, void *priv);
  22
  23 /**
  24   * struct mbox - Mailbox instance struct
  25   * @list:              Linked list head.
  26   * @pdev:              Pointer to device struct.
  27   * @cb:                Callback function. Will be called
  28   *                     when new data is received.
  29   * @client_data:       Clients private data. Will be sent back
  30   *                     in the callback function.
  31   * @virtbase_peer:     Virtual address for outgoing mailbox.
  32   * @virtbase_local:    Virtual address for incoming mailbox.
  33   * @buffer:            Then internal queue for outgoing messages.
  34   * @name:              Name of this mailbox.
  35   * @buffer_available:  Completion variable to achieve "blocking send".
  36   *                     This variable will be signaled when there is
  37   *                     internal buffer space available.
  38   * @client_blocked:    To keep track if any client is currently
  39   *                     blocked.
  40   * @lock:              Spinlock to protect this mailbox instance.
  41   * @write_index:       Index in internal buffer to write to.
  42   * @read_index:        Index in internal buffer to read from.
  43   * @allocated:         Indicates whether this particular mailbox
  44   *                     id has been allocated by someone.
  45   */
  46 struct mbox {
  47         struct list_head list;
  48         struct platform_device *pdev;
  49         mbox_recv_cb_t *cb;
  50         void *client_data;
  51         void __iomem *virtbase_peer;
  52         void __iomem *virtbase_local;
  53         u32 buffer[MBOX_BUF_SIZE];
  54         char name[MBOX_NAME_SIZE];
  55         struct completion buffer_available;
  56         u8 client_blocked;
  57         spinlock_t lock;
  58         u8 write_index;
  59         u8 read_index;
  60         bool allocated;
  61 };
  62
  63 /**
  64   * mbox_setup - Set up a mailbox and return its instance.
  65   * @mbox_id:   The ID number of the mailbox. 0 or 1 for modem CPU,
  66   *             2 for modem DSP.
  67   * @mbox_cb:   Pointer to the callback function to be called when a new message
  68   *             is received.
  69   * @priv:      Client user data which will be returned in the callback.
  70   *
  71   * Returns a mailbox instance to be specified in subsequent calls to mbox_send.
  72   */
  73 struct mbox *mbox_setup(u8 mbox_id, mbox_recv_cb_t *mbox_cb, void *priv);
  74
  75 /**
  76   * mbox_send - Send a mailbox message.
  77   * @mbox:      Mailbox instance (returned by mbox_setup)
  78   * @mbox_msg:  The mailbox message to send.
  79   * @block:     Specifies whether this call will block until send is possible,
  80   *             or return an error if the mailbox buffer is full.
  81   *
  82   * Returns 0 on success or a negative error code on error. -ENOMEM indicates
  83   * that the internal buffer is full and you have to try again later (or
  84   * specify "block" in order to block until send is possible).
  85   */
  86 int mbox_send(struct mbox *mbox, u32 mbox_msg, bool block);
  87
  88 #endif /*INC_STE_MBOX_H*/