214 lines
5.6 KiB
C
214 lines
5.6 KiB
C
/*
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* Public header for the MPC52xx processor BestComm driver
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*
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*
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* Copyright (C) 2006 Sylvain Munaut <tnt@246tNt.com>
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* Copyright (C) 2005 Varma Electronics Oy,
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* ( by Andrey Volkov <avolkov@varma-el.com> )
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* Copyright (C) 2003-2004 MontaVista, Software, Inc.
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* ( by Dale Farnsworth <dfarnsworth@mvista.com> )
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*/
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#ifndef __BESTCOMM_H__
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#define __BESTCOMM_H__
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/**
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* struct bcom_bd - Structure describing a generic BestComm buffer descriptor
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* @status: The current status of this buffer. Exact meaning depends on the
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* task type
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* @data: An array of u32 extra data. Size of array is task dependent.
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*
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* Note: Don't dereference a bcom_bd pointer as an array. The size of the
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* bcom_bd is variable. Use bcom_get_bd() instead.
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*/
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struct bcom_bd {
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u32 status;
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u32 data[0]; /* variable payload size */
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};
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/* ======================================================================== */
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/* Generic task management */
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/* ======================================================================== */
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/**
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* struct bcom_task - Structure describing a loaded BestComm task
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*
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* This structure is never built by the driver it self. It's built and
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* filled the intermediate layer of the BestComm API, the task dependent
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* support code.
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*
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* Most likely you don't need to poke around inside this structure. The
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* fields are exposed in the header just for the sake of inline functions
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*/
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struct bcom_task {
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unsigned int tasknum;
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unsigned int flags;
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int irq;
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struct bcom_bd *bd;
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phys_addr_t bd_pa;
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void **cookie;
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unsigned short index;
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unsigned short outdex;
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unsigned int num_bd;
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unsigned int bd_size;
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void* priv;
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};
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#define BCOM_FLAGS_NONE 0x00000000ul
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#define BCOM_FLAGS_ENABLE_TASK (1ul << 0)
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/**
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* bcom_enable - Enable a BestComm task
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* @tsk: The BestComm task structure
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*
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* This function makes sure the given task is enabled and can be run
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* by the BestComm engine as needed
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*/
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extern void bcom_enable(struct bcom_task *tsk);
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/**
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* bcom_disable - Disable a BestComm task
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* @tsk: The BestComm task structure
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*
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* This function disable a given task, making sure it's not executed
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* by the BestComm engine.
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*/
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extern void bcom_disable(struct bcom_task *tsk);
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/**
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* bcom_get_task_irq - Returns the irq number of a BestComm task
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* @tsk: The BestComm task structure
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*/
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static inline int
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bcom_get_task_irq(struct bcom_task *tsk) {
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return tsk->irq;
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}
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/* ======================================================================== */
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/* BD based tasks helpers */
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/* ======================================================================== */
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#define BCOM_BD_READY 0x40000000ul
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/** _bcom_next_index - Get next input index.
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* @tsk: pointer to task structure
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*
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* Support function; Device drivers should not call this
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*/
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static inline int
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_bcom_next_index(struct bcom_task *tsk)
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{
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return ((tsk->index + 1) == tsk->num_bd) ? 0 : tsk->index + 1;
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}
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/** _bcom_next_outdex - Get next output index.
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* @tsk: pointer to task structure
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*
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* Support function; Device drivers should not call this
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*/
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static inline int
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_bcom_next_outdex(struct bcom_task *tsk)
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{
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return ((tsk->outdex + 1) == tsk->num_bd) ? 0 : tsk->outdex + 1;
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}
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/**
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* bcom_queue_empty - Checks if a BestComm task BD queue is empty
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* @tsk: The BestComm task structure
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*/
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static inline int
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bcom_queue_empty(struct bcom_task *tsk)
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{
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return tsk->index == tsk->outdex;
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}
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/**
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* bcom_queue_full - Checks if a BestComm task BD queue is full
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* @tsk: The BestComm task structure
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*/
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static inline int
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bcom_queue_full(struct bcom_task *tsk)
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{
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return tsk->outdex == _bcom_next_index(tsk);
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}
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/**
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* bcom_get_bd - Get a BD from the queue
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* @tsk: The BestComm task structure
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* index: Index of the BD to fetch
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*/
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static inline struct bcom_bd
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*bcom_get_bd(struct bcom_task *tsk, unsigned int index)
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{
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/* A cast to (void*) so the address can be incremented by the
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* real size instead of by sizeof(struct bcom_bd) */
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return ((void *)tsk->bd) + (index * tsk->bd_size);
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}
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/**
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* bcom_buffer_done - Checks if a BestComm
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* @tsk: The BestComm task structure
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*/
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static inline int
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bcom_buffer_done(struct bcom_task *tsk)
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{
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struct bcom_bd *bd;
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if (bcom_queue_empty(tsk))
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return 0;
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bd = bcom_get_bd(tsk, tsk->outdex);
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return !(bd->status & BCOM_BD_READY);
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}
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/**
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* bcom_prepare_next_buffer - clear status of next available buffer.
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* @tsk: The BestComm task structure
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*
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* Returns pointer to next buffer descriptor
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*/
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static inline struct bcom_bd *
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bcom_prepare_next_buffer(struct bcom_task *tsk)
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{
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struct bcom_bd *bd;
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bd = bcom_get_bd(tsk, tsk->index);
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bd->status = 0; /* cleanup last status */
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return bd;
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}
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static inline void
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bcom_submit_next_buffer(struct bcom_task *tsk, void *cookie)
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{
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struct bcom_bd *bd = bcom_get_bd(tsk, tsk->index);
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tsk->cookie[tsk->index] = cookie;
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mb(); /* ensure the bd is really up-to-date */
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bd->status |= BCOM_BD_READY;
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tsk->index = _bcom_next_index(tsk);
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if (tsk->flags & BCOM_FLAGS_ENABLE_TASK)
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bcom_enable(tsk);
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}
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static inline void *
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bcom_retrieve_buffer(struct bcom_task *tsk, u32 *p_status, struct bcom_bd **p_bd)
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{
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void *cookie = tsk->cookie[tsk->outdex];
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struct bcom_bd *bd = bcom_get_bd(tsk, tsk->outdex);
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if (p_status)
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*p_status = bd->status;
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if (p_bd)
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*p_bd = bd;
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tsk->outdex = _bcom_next_outdex(tsk);
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return cookie;
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}
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#endif /* __BESTCOMM_H__ */
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