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32 /*****************************************************************************/
35 * @file xemacps_bdring.h
37 * The Xiline EmacPs Buffer Descriptor ring driver. This is part of EmacPs
38 * DMA functionalities.
41 * MODIFICATION HISTORY:
43 * Ver Who Date Changes
44 * ----- ---- -------- -------------------------------------------------------
45 * 1.00a wsy 01/10/10 First release
46 * 2.1 srt 07/15/14 Add support for Zynq Ultrascale Mp architecture.
47 * 3.0 kvn 02/13/15 Modified code for MISRA-C:2012 compliance.
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 UINTPTR PhysBaseAddr;/**< Physical address of 1st BD in list */
66 UINTPTR BaseBdAddr; /**< Virtual address of 1st BD in list */
67 UINTPTR 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 */
82 u32 HwCnt; /**< Number of BDs in work group */
83 u32 PreCnt; /**< Number of BDs in pre-work group */
84 u32 FreeCnt; /**< Number of allocatable BDs in the free group */
85 u32 PostCnt; /**< Number of BDs in post-work group */
86 u32 AllCnt; /**< Total Number of BDs for channel */
90 /***************** Macros (Inline Functions) Definitions *********************/
92 /*****************************************************************************/
94 * Use this macro at initialization time to determine how many BDs will fit
95 * in a BD list within the given memory constraints.
97 * The results of this macro can be provided to XEmacPs_BdRingCreate().
99 * @param Alignment specifies what byte alignment the BDs must fall on and
100 * must be a power of 2 to get an accurate calculation (32, 64, 128,...)
101 * @param Bytes is the number of bytes to be used to store BDs.
103 * @return Number of BDs that can fit in the given memory area
107 * u32 XEmacPs_BdRingCntCalc(u32 Alignment, u32 Bytes)
109 ******************************************************************************/
110 #define XEmacPs_BdRingCntCalc(Alignment, Bytes) \
111 (u32)((Bytes) / (sizeof(XEmacPs_Bd)))
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) * (NumBd))
134 /****************************************************************************/
136 * Return the total number of BDs allocated by this channel with
137 * XEmacPs_BdRingCreate().
139 * @param RingPtr is the DMA channel to operate on.
141 * @return The total number of BDs allocated for this channel.
145 * u32 XEmacPs_BdRingGetCnt(XEmacPs_BdRing* RingPtr)
147 *****************************************************************************/
148 #define XEmacPs_BdRingGetCnt(RingPtr) ((RingPtr)->AllCnt)
150 /****************************************************************************/
152 * Return the number of BDs allocatable with XEmacPs_BdRingAlloc() for pre-
155 * @param RingPtr is the DMA channel to operate on.
157 * @return The number of BDs currently allocatable.
161 * u32 XEmacPs_BdRingGetFreeCnt(XEmacPs_BdRing* RingPtr)
163 *****************************************************************************/
164 #define XEmacPs_BdRingGetFreeCnt(RingPtr) ((RingPtr)->FreeCnt)
166 /****************************************************************************/
168 * Return the next BD from BdPtr in a list.
170 * @param RingPtr is the DMA channel to operate on.
171 * @param BdPtr is the BD to operate on.
173 * @return The next BD in the list relative to the BdPtr parameter.
177 * XEmacPs_Bd *XEmacPs_BdRingNext(XEmacPs_BdRing* RingPtr,
180 *****************************************************************************/
181 #define XEmacPs_BdRingNext(RingPtr, BdPtr) \
182 (((UINTPTR)((void *)(BdPtr)) >= (RingPtr)->HighBdAddr) ? \
183 (XEmacPs_Bd*)((void*)(RingPtr)->BaseBdAddr) : \
184 (XEmacPs_Bd*)((UINTPTR)((void *)(BdPtr)) + (RingPtr)->Separation))
186 /****************************************************************************/
188 * Return the previous BD from BdPtr in the list.
190 * @param RingPtr is the DMA channel to operate on.
191 * @param BdPtr is the BD to operate on
193 * @return The previous BD in the list relative to the BdPtr parameter.
197 * XEmacPs_Bd *XEmacPs_BdRingPrev(XEmacPs_BdRing* RingPtr,
200 *****************************************************************************/
201 #define XEmacPs_BdRingPrev(RingPtr, BdPtr) \
202 (((UINTPTR)(BdPtr) <= (RingPtr)->BaseBdAddr) ? \
203 (XEmacPs_Bd*)(RingPtr)->HighBdAddr : \
204 (XEmacPs_Bd*)((UINTPTR)(BdPtr) - (RingPtr)->Separation))
206 /************************** Function Prototypes ******************************/
209 * Scatter gather DMA related functions in xemacps_bdring.c
211 LONG XEmacPs_BdRingCreate(XEmacPs_BdRing * RingPtr, UINTPTR PhysAddr,
212 UINTPTR VirtAddr, u32 Alignment, u32 BdCount);
213 LONG XEmacPs_BdRingClone(XEmacPs_BdRing * RingPtr, XEmacPs_Bd * SrcBdPtr,
215 LONG XEmacPs_BdRingAlloc(XEmacPs_BdRing * RingPtr, u32 NumBd,
216 XEmacPs_Bd ** BdSetPtr);
217 LONG XEmacPs_BdRingUnAlloc(XEmacPs_BdRing * RingPtr, u32 NumBd,
218 XEmacPs_Bd * BdSetPtr);
219 LONG XEmacPs_BdRingToHw(XEmacPs_BdRing * RingPtr, u32 NumBd,
220 XEmacPs_Bd * BdSetPtr);
221 LONG XEmacPs_BdRingFree(XEmacPs_BdRing * RingPtr, u32 NumBd,
222 XEmacPs_Bd * BdSetPtr);
223 u32 XEmacPs_BdRingFromHwTx(XEmacPs_BdRing * RingPtr, u32 BdLimit,
224 XEmacPs_Bd ** BdSetPtr);
225 u32 XEmacPs_BdRingFromHwRx(XEmacPs_BdRing * RingPtr, u32 BdLimit,
226 XEmacPs_Bd ** BdSetPtr);
227 LONG XEmacPs_BdRingCheck(XEmacPs_BdRing * RingPtr, u8 Direction);
235 #endif /* end of protection macros */