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/*
* Copyright (C) ST-Ericsson SA 2010
* Author: Stefan Nilsson <stefan.xk.nilsson@stericsson.com> for ST-Ericsson.
* Author: Martin Persson <martin.persson@stericsson.com> for ST-Ericsson.
* License terms: GNU General Public License (GPL), version 2.
*/
#ifndef __INC_STE_MBOX_H
#define __INC_STE_MBOX_H
#define MBOX_BUF_SIZE 16
#define MBOX_NAME_SIZE 8
/**
* mbox_recv_cb_t - Definition of the mailbox callback.
* @mbox_msg: The mailbox message.
* @priv: The clients private data as specified in the call to mbox_setup.
*
* This function will be called upon reception of new mailbox messages.
*/
typedef void mbox_recv_cb_t (u32 mbox_msg, void *priv);
/**
* struct mbox - Mailbox instance struct
* @list: Linked list head.
* @pdev: Pointer to device struct.
* @cb: Callback function. Will be called
* when new data is received.
* @client_data: Clients private data. Will be sent back
* in the callback function.
* @virtbase_peer: Virtual address for outgoing mailbox.
* @virtbase_local: Virtual address for incoming mailbox.
* @buffer: Then internal queue for outgoing messages.
* @name: Name of this mailbox.
* @buffer_available: Completion variable to achieve "blocking send".
* This variable will be signaled when there is
* internal buffer space available.
* @client_blocked: To keep track if any client is currently
* blocked.
* @lock: Spinlock to protect this mailbox instance.
* @write_index: Index in internal buffer to write to.
* @read_index: Index in internal buffer to read from.
* @allocated: Indicates whether this particular mailbox
* id has been allocated by someone.
*/
struct mbox {
struct list_head list;
struct platform_device *pdev;
mbox_recv_cb_t *cb;
void *client_data;
void __iomem *virtbase_peer;
void __iomem *virtbase_local;
u32 buffer[MBOX_BUF_SIZE];
char name[MBOX_NAME_SIZE];
struct completion buffer_available;
u8 client_blocked;
spinlock_t lock;
u8 write_index;
u8 read_index;
bool allocated;
};
/**
* mbox_setup - Set up a mailbox and return its instance.
* @mbox_id: The ID number of the mailbox. 0 or 1 for modem CPU,
* 2 for modem DSP.
* @mbox_cb: Pointer to the callback function to be called when a new message
* is received.
* @priv: Client user data which will be returned in the callback.
*
* Returns a mailbox instance to be specified in subsequent calls to mbox_send.
*/
struct mbox *mbox_setup(u8 mbox_id, mbox_recv_cb_t *mbox_cb, void *priv);
/**
* mbox_send - Send a mailbox message.
* @mbox: Mailbox instance (returned by mbox_setup)
* @mbox_msg: The mailbox message to send.
* @block: Specifies whether this call will block until send is possible,
* or return an error if the mailbox buffer is full.
*
* Returns 0 on success or a negative error code on error. -ENOMEM indicates
* that the internal buffer is full and you have to try again later (or
* specify "block" in order to block until send is possible).
*/
int mbox_send(struct mbox *mbox, u32 mbox_msg, bool block);
#endif /*INC_STE_MBOX_H*/
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