1 /* $Id: xemacps_bdring.h,v 1.1.2.1 2011/01/20 03:39:02 sadanan Exp $ */
2 /******************************************************************************
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32 ******************************************************************************/
33 /*****************************************************************************/
36 * @file xemacps_bdring.h
38 * The Xiline EmacPs Buffer Descriptor ring driver. This is part of EmacPs
39 * DMA functionalities.
42 * MODIFICATION HISTORY:
44 * Ver Who Date Changes
45 * ----- ---- -------- -------------------------------------------------------
46 * 1.00a wsy 01/10/10 First release
49 ******************************************************************************/
51 #ifndef XEMACPS_BDRING_H /* prevent curcular inclusions */
52 #define XEMACPS_BDRING_H /* by using protection macros */
59 /**************************** Type Definitions *******************************/
61 /** This is an internal structure used to maintain the DMA list */
63 u32 PhysBaseAddr;/**< Physical address of 1st BD in list */
64 u32 BaseBdAddr; /**< Virtual address of 1st BD in list */
65 u32 HighBdAddr; /**< Virtual address of last BD in the list */
66 u32 Length; /**< Total size of ring in bytes */
67 u32 RunState; /**< Flag to indicate DMA is started */
68 u32 Separation; /**< Number of bytes between the starting address
71 /**< First BD in the free group */
72 XEmacPs_Bd *PreHead;/**< First BD in the pre-work group */
73 XEmacPs_Bd *HwHead; /**< First BD in the work group */
74 XEmacPs_Bd *HwTail; /**< Last BD in the work group */
76 /**< First BD in the post-work group */
77 XEmacPs_Bd *BdaRestart;
78 /**< BDA to load when channel is started */
79 unsigned HwCnt; /**< Number of BDs in work group */
80 unsigned PreCnt; /**< Number of BDs in pre-work group */
81 unsigned FreeCnt; /**< Number of allocatable BDs in the free group */
82 unsigned PostCnt; /**< Number of BDs in post-work group */
83 unsigned AllCnt; /**< Total Number of BDs for channel */
87 /***************** Macros (Inline Functions) Definitions *********************/
89 /*****************************************************************************/
91 * Use this macro at initialization time to determine how many BDs will fit
92 * in a BD list within the given memory constraints.
94 * The results of this macro can be provided to XEmacPs_BdRingCreate().
96 * @param Alignment specifies what byte alignment the BDs must fall on and
97 * must be a power of 2 to get an accurate calculation (32, 64, 128,...)
98 * @param Bytes is the number of bytes to be used to store BDs.
100 * @return Number of BDs that can fit in the given memory area
104 * u32 XEmacPs_BdRingCntCalc(u32 Alignment, u32 Bytes)
106 ******************************************************************************/
107 #define XEmacPs_BdRingCntCalc(Alignment, Bytes) \
108 (u32)((Bytes) / ((sizeof(XEmacPs_Bd) + ((Alignment)-1)) & \
111 /*****************************************************************************/
113 * Use this macro at initialization time to determine how many bytes of memory
114 * is required to contain a given number of BDs at a given alignment.
116 * @param Alignment specifies what byte alignment the BDs must fall on. This
117 * parameter must be a power of 2 to get an accurate calculation (32, 64,
119 * @param NumBd is the number of BDs to calculate memory size requirements for
121 * @return The number of bytes of memory required to create a BD list with the
122 * given memory constraints.
126 * u32 XEmacPs_BdRingMemCalc(u32 Alignment, u32 NumBd)
128 ******************************************************************************/
129 #define XEmacPs_BdRingMemCalc(Alignment, NumBd) \
130 (u32)((sizeof(XEmacPs_Bd) + ((Alignment)-1)) & \
131 ~((Alignment)-1)) * (NumBd)
133 /****************************************************************************/
135 * Return the total number of BDs allocated by this channel with
136 * XEmacPs_BdRingCreate().
138 * @param RingPtr is the DMA channel to operate on.
140 * @return The total number of BDs allocated for this channel.
144 * u32 XEmacPs_BdRingGetCnt(XEmacPs_BdRing* RingPtr)
146 *****************************************************************************/
147 #define XEmacPs_BdRingGetCnt(RingPtr) ((RingPtr)->AllCnt)
149 /****************************************************************************/
151 * Return the number of BDs allocatable with XEmacPs_BdRingAlloc() for pre-
154 * @param RingPtr is the DMA channel to operate on.
156 * @return The number of BDs currently allocatable.
160 * u32 XEmacPs_BdRingGetFreeCnt(XEmacPs_BdRing* RingPtr)
162 *****************************************************************************/
163 #define XEmacPs_BdRingGetFreeCnt(RingPtr) ((RingPtr)->FreeCnt)
165 /****************************************************************************/
167 * Return the next BD from BdPtr in a list.
169 * @param RingPtr is the DMA channel to operate on.
170 * @param BdPtr is the BD to operate on.
172 * @return The next BD in the list relative to the BdPtr parameter.
176 * XEmacPs_Bd *XEmacPs_BdRingNext(XEmacPs_BdRing* RingPtr,
179 *****************************************************************************/
180 #define XEmacPs_BdRingNext(RingPtr, BdPtr) \
181 (((u32)(BdPtr) >= (RingPtr)->HighBdAddr) ? \
182 (XEmacPs_Bd*)(RingPtr)->BaseBdAddr : \
183 (XEmacPs_Bd*)((u32)(BdPtr) + (RingPtr)->Separation))
185 /****************************************************************************/
187 * Return the previous BD from BdPtr in the list.
189 * @param RingPtr is the DMA channel to operate on.
190 * @param BdPtr is the BD to operate on
192 * @return The previous BD in the list relative to the BdPtr parameter.
196 * XEmacPs_Bd *XEmacPs_BdRingPrev(XEmacPs_BdRing* RingPtr,
199 *****************************************************************************/
200 #define XEmacPs_BdRingPrev(RingPtr, BdPtr) \
201 (((u32)(BdPtr) <= (RingPtr)->BaseBdAddr) ? \
202 (XEmacPs_Bd*)(RingPtr)->HighBdAddr : \
203 (XEmacPs_Bd*)((u32)(BdPtr) - (RingPtr)->Separation))
205 /************************** Function Prototypes ******************************/
208 * Scatter gather DMA related functions in xemacps_bdring.c
210 int XEmacPs_BdRingCreate(XEmacPs_BdRing * RingPtr, u32 PhysAddr,
211 u32 VirtAddr, u32 Alignment, unsigned BdCount);
212 int XEmacPs_BdRingClone(XEmacPs_BdRing * RingPtr, XEmacPs_Bd * SrcBdPtr,
214 int XEmacPs_BdRingAlloc(XEmacPs_BdRing * RingPtr, unsigned NumBd,
215 XEmacPs_Bd ** BdSetPtr);
216 int XEmacPs_BdRingUnAlloc(XEmacPs_BdRing * RingPtr, unsigned NumBd,
217 XEmacPs_Bd * BdSetPtr);
218 int XEmacPs_BdRingToHw(XEmacPs_BdRing * RingPtr, unsigned NumBd,
219 XEmacPs_Bd * BdSetPtr);
220 int XEmacPs_BdRingFree(XEmacPs_BdRing * RingPtr, unsigned NumBd,
221 XEmacPs_Bd * BdSetPtr);
222 unsigned XEmacPs_BdRingFromHwTx(XEmacPs_BdRing * RingPtr, unsigned BdLimit,
223 XEmacPs_Bd ** BdSetPtr);
224 unsigned XEmacPs_BdRingFromHwRx(XEmacPs_BdRing * RingPtr, unsigned BdLimit,
225 XEmacPs_Bd ** BdSetPtr);
226 int XEmacPs_BdRingCheck(XEmacPs_BdRing * RingPtr, u8 Direction);
233 #endif /* end of protection macros */