1 /* $Id: xemacps_bdring.h,v 1.1.2.1 2011/01/20 03:39:02 sadanan Exp $ */
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32 ******************************************************************************/
33 /*****************************************************************************/
36 * @file xemacps_bdring.h
37 * @addtogroup emacps_v2_0
40 * The Xiline EmacPs Buffer Descriptor ring driver. This is part of EmacPs
41 * DMA functionalities.
44 * MODIFICATION HISTORY:
46 * Ver Who Date Changes
47 * ----- ---- -------- -------------------------------------------------------
48 * 1.00a wsy 01/10/10 First release
51 ******************************************************************************/
53 #ifndef XEMACPS_BDRING_H /* prevent curcular inclusions */
54 #define XEMACPS_BDRING_H /* by using protection macros */
61 /**************************** Type Definitions *******************************/
63 /** This is an internal structure used to maintain the DMA list */
65 u32 PhysBaseAddr;/**< Physical address of 1st BD in list */
66 u32 BaseBdAddr; /**< Virtual address of 1st BD in list */
67 u32 HighBdAddr; /**< Virtual address of last BD in the list */
68 u32 Length; /**< Total size of ring in bytes */
69 u32 RunState; /**< Flag to indicate DMA is started */
70 u32 Separation; /**< Number of bytes between the starting address
73 /**< First BD in the free group */
74 XEmacPs_Bd *PreHead;/**< First BD in the pre-work group */
75 XEmacPs_Bd *HwHead; /**< First BD in the work group */
76 XEmacPs_Bd *HwTail; /**< Last BD in the work group */
78 /**< First BD in the post-work group */
79 XEmacPs_Bd *BdaRestart;
80 /**< BDA to load when channel is started */
81 unsigned HwCnt; /**< Number of BDs in work group */
82 unsigned PreCnt; /**< Number of BDs in pre-work group */
83 unsigned FreeCnt; /**< Number of allocatable BDs in the free group */
84 unsigned PostCnt; /**< Number of BDs in post-work group */
85 unsigned AllCnt; /**< Total Number of BDs for channel */
89 /***************** Macros (Inline Functions) Definitions *********************/
91 /*****************************************************************************/
93 * Use this macro at initialization time to determine how many BDs will fit
94 * in a BD list within the given memory constraints.
96 * The results of this macro can be provided to XEmacPs_BdRingCreate().
98 * @param Alignment specifies what byte alignment the BDs must fall on and
99 * must be a power of 2 to get an accurate calculation (32, 64, 128,...)
100 * @param Bytes is the number of bytes to be used to store BDs.
102 * @return Number of BDs that can fit in the given memory area
106 * u32 XEmacPs_BdRingCntCalc(u32 Alignment, u32 Bytes)
108 ******************************************************************************/
109 #define XEmacPs_BdRingCntCalc(Alignment, Bytes) \
110 (u32)((Bytes) / ((sizeof(XEmacPs_Bd) + ((Alignment)-1)) & \
113 /*****************************************************************************/
115 * Use this macro at initialization time to determine how many bytes of memory
116 * is required to contain a given number of BDs at a given alignment.
118 * @param Alignment specifies what byte alignment the BDs must fall on. This
119 * parameter must be a power of 2 to get an accurate calculation (32, 64,
121 * @param NumBd is the number of BDs to calculate memory size requirements for
123 * @return The number of bytes of memory required to create a BD list with the
124 * given memory constraints.
128 * u32 XEmacPs_BdRingMemCalc(u32 Alignment, u32 NumBd)
130 ******************************************************************************/
131 #define XEmacPs_BdRingMemCalc(Alignment, NumBd) \
132 (u32)((sizeof(XEmacPs_Bd) + ((Alignment)-1)) & \
133 ~((Alignment)-1)) * (NumBd)
135 /****************************************************************************/
137 * Return the total number of BDs allocated by this channel with
138 * XEmacPs_BdRingCreate().
140 * @param RingPtr is the DMA channel to operate on.
142 * @return The total number of BDs allocated for this channel.
146 * u32 XEmacPs_BdRingGetCnt(XEmacPs_BdRing* RingPtr)
148 *****************************************************************************/
149 #define XEmacPs_BdRingGetCnt(RingPtr) ((RingPtr)->AllCnt)
151 /****************************************************************************/
153 * Return the number of BDs allocatable with XEmacPs_BdRingAlloc() for pre-
156 * @param RingPtr is the DMA channel to operate on.
158 * @return The number of BDs currently allocatable.
162 * u32 XEmacPs_BdRingGetFreeCnt(XEmacPs_BdRing* RingPtr)
164 *****************************************************************************/
165 #define XEmacPs_BdRingGetFreeCnt(RingPtr) ((RingPtr)->FreeCnt)
167 /****************************************************************************/
169 * Return the next BD from BdPtr in a list.
171 * @param RingPtr is the DMA channel to operate on.
172 * @param BdPtr is the BD to operate on.
174 * @return The next BD in the list relative to the BdPtr parameter.
178 * XEmacPs_Bd *XEmacPs_BdRingNext(XEmacPs_BdRing* RingPtr,
181 *****************************************************************************/
182 #define XEmacPs_BdRingNext(RingPtr, BdPtr) \
183 (((u32)(BdPtr) >= (RingPtr)->HighBdAddr) ? \
184 (XEmacPs_Bd*)(RingPtr)->BaseBdAddr : \
185 (XEmacPs_Bd*)((u32)(BdPtr) + (RingPtr)->Separation))
187 /****************************************************************************/
189 * Return the previous BD from BdPtr in the list.
191 * @param RingPtr is the DMA channel to operate on.
192 * @param BdPtr is the BD to operate on
194 * @return The previous BD in the list relative to the BdPtr parameter.
198 * XEmacPs_Bd *XEmacPs_BdRingPrev(XEmacPs_BdRing* RingPtr,
201 *****************************************************************************/
202 #define XEmacPs_BdRingPrev(RingPtr, BdPtr) \
203 (((u32)(BdPtr) <= (RingPtr)->BaseBdAddr) ? \
204 (XEmacPs_Bd*)(RingPtr)->HighBdAddr : \
205 (XEmacPs_Bd*)((u32)(BdPtr) - (RingPtr)->Separation))
207 /************************** Function Prototypes ******************************/
210 * Scatter gather DMA related functions in xemacps_bdring.c
212 int XEmacPs_BdRingCreate(XEmacPs_BdRing * RingPtr, u32 PhysAddr,
213 u32 VirtAddr, u32 Alignment, unsigned BdCount);
214 int XEmacPs_BdRingClone(XEmacPs_BdRing * RingPtr, XEmacPs_Bd * SrcBdPtr,
216 int XEmacPs_BdRingAlloc(XEmacPs_BdRing * RingPtr, unsigned NumBd,
217 XEmacPs_Bd ** BdSetPtr);
218 int XEmacPs_BdRingUnAlloc(XEmacPs_BdRing * RingPtr, unsigned NumBd,
219 XEmacPs_Bd * BdSetPtr);
220 int XEmacPs_BdRingToHw(XEmacPs_BdRing * RingPtr, unsigned NumBd,
221 XEmacPs_Bd * BdSetPtr);
222 int XEmacPs_BdRingFree(XEmacPs_BdRing * RingPtr, unsigned NumBd,
223 XEmacPs_Bd * BdSetPtr);
224 unsigned XEmacPs_BdRingFromHwTx(XEmacPs_BdRing * RingPtr, unsigned BdLimit,
225 XEmacPs_Bd ** BdSetPtr);
226 unsigned XEmacPs_BdRingFromHwRx(XEmacPs_BdRing * RingPtr, unsigned BdLimit,
227 XEmacPs_Bd ** BdSetPtr);
228 int XEmacPs_BdRingCheck(XEmacPs_BdRing * RingPtr, u8 Direction);
235 #endif /* end of protection macros */