7  *                         ( by Andrey Volkov <avolkov@varma-el.com> )
8  * Copyright (C) 2003-2004 MontaVista, Software, Inc.
20  * struct bcom_bd - Structure describing a generic BestComm buffer descriptor
38  * struct bcom_task - Structure describing a loaded BestComm task
52 	struct bcom_bd	*bd;  member
67  * bcom_enable - Enable a BestComm task
76  * bcom_disable - Disable a BestComm task
86  * bcom_get_task_irq - Returns the irq number of a BestComm task
91 	return tsk->irq;  in bcom_get_task_irq()
95 /* BD based tasks helpers                                                   */
100 /** _bcom_next_index - Get next input index.
108 	return ((tsk->index + 1) == tsk->num_bd) ? 0 : tsk->index + 1;  in _bcom_next_index()
111 /** _bcom_next_outdex - Get next output index.
119 	return ((tsk->outdex + 1) == tsk->num_bd) ? 0 : tsk->outdex + 1;  in _bcom_next_outdex()
123  * bcom_queue_empty - Checks if a BestComm task BD queue is empty
129 	return tsk->index == tsk->outdex;  in bcom_queue_empty()
133  * bcom_queue_full - Checks if a BestComm task BD queue is full
139 	return tsk->outdex == _bcom_next_index(tsk);  in bcom_queue_full()
143  * bcom_get_bd - Get a BD from the queue
145  * index: Index of the BD to fetch
150 	/* A cast to (void*) so the address can be incremented by the  in bcom_get_bd()
152 	return ((void *)tsk->bd) + (index * tsk->bd_size);  in bcom_get_bd()
156  * bcom_buffer_done - Checks if a BestComm 
162 	struct bcom_bd *bd;  in bcom_buffer_done()  local
166 	bd = bcom_get_bd(tsk, tsk->outdex);  in bcom_buffer_done()
167 	return !(bd->status & BCOM_BD_READY);  in bcom_buffer_done()
171  * bcom_prepare_next_buffer - clear status of next available buffer.
179 	struct bcom_bd *bd;  in bcom_prepare_next_buffer()  local
181 	bd = bcom_get_bd(tsk, tsk->index);  in bcom_prepare_next_buffer()
182 	bd->status = 0;	/* cleanup last status */  in bcom_prepare_next_buffer()
183 	return bd;  in bcom_prepare_next_buffer()
189 	struct bcom_bd *bd = bcom_get_bd(tsk, tsk->index);  in bcom_submit_next_buffer()  local
191 	tsk->cookie[tsk->index] = cookie;  in bcom_submit_next_buffer()
192 	mb();	/* ensure the bd is really up-to-date */  in bcom_submit_next_buffer()
193 	bd->status |= BCOM_BD_READY;  in bcom_submit_next_buffer()
194 	tsk->index = _bcom_next_index(tsk);  in bcom_submit_next_buffer()
195 	if (tsk->flags & BCOM_FLAGS_ENABLE_TASK)  in bcom_submit_next_buffer()
202 	void *cookie = tsk->cookie[tsk->outdex];  in bcom_retrieve_buffer()
203 	struct bcom_bd *bd = bcom_get_bd(tsk, tsk->outdex);  in bcom_retrieve_buffer()  local
206 		*p_status = bd->status;  in bcom_retrieve_buffer()
208 		*p_bd = bd;  in bcom_retrieve_buffer()
209 	tsk->outdex = _bcom_next_outdex(tsk);  in bcom_retrieve_buffer()