aboutsummaryrefslogtreecommitdiff
path: root/arch/arm/mach-bcmring/include/csp/dmacHw.h
blob: 5d510130a25f9e382be285aa573310a4d68f5754 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
/*****************************************************************************
* Copyright 2004 - 2008 Broadcom Corporation.  All rights reserved.
*
* Unless you and Broadcom execute a separate written software license
* agreement governing use of this software, this software is licensed to you
* under the terms of the GNU General Public License version 2, available at
* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
*
* Notwithstanding the above, under no circumstances may you combine this
* software in any way with any other Broadcom software provided under a
* license other than the GPL, without Broadcom's express prior written
* consent.
*****************************************************************************/

/****************************************************************************/
/**
*  @file    dmacHw.h
*
*  @brief   API definitions for low level DMA controller driver
*
*/
/****************************************************************************/
#ifndef _DMACHW_H
#define _DMACHW_H

#include <stddef.h>

#include <csp/stdint.h>
#include <mach/csp/dmacHw_reg.h>

/* Define DMA Channel ID using DMA controller number (m) and channel number (c).

   System specific channel ID should be defined as follows

   For example:

   #include <dmacHw.h>
   ...
   #define systemHw_LCD_CHANNEL_ID                dmacHw_MAKE_CHANNEL_ID(0,5)
   #define systemHw_SWITCH_RX_CHANNEL_ID          dmacHw_MAKE_CHANNEL_ID(0,0)
   #define systemHw_SWITCH_TX_CHANNEL_ID          dmacHw_MAKE_CHANNEL_ID(0,1)
   #define systemHw_APM_RX_CHANNEL_ID             dmacHw_MAKE_CHANNEL_ID(0,3)
   #define systemHw_APM_TX_CHANNEL_ID             dmacHw_MAKE_CHANNEL_ID(0,4)
   ...
   #define systemHw_SHARED1_CHANNEL_ID            dmacHw_MAKE_CHANNEL_ID(1,4)
   #define systemHw_SHARED2_CHANNEL_ID            dmacHw_MAKE_CHANNEL_ID(1,5)
   #define systemHw_SHARED3_CHANNEL_ID            dmacHw_MAKE_CHANNEL_ID(0,6)
   ...
*/
#define dmacHw_MAKE_CHANNEL_ID(m, c)         (m << 8 | c)

typedef enum {
	dmacHw_CHANNEL_PRIORITY_0 = dmacHw_REG_CFG_LO_CH_PRIORITY_0,	/* Channel priority 0. Lowest priority DMA channel */
	dmacHw_CHANNEL_PRIORITY_1 = dmacHw_REG_CFG_LO_CH_PRIORITY_1,	/* Channel priority 1 */
	dmacHw_CHANNEL_PRIORITY_2 = dmacHw_REG_CFG_LO_CH_PRIORITY_2,	/* Channel priority 2 */
	dmacHw_CHANNEL_PRIORITY_3 = dmacHw_REG_CFG_LO_CH_PRIORITY_3,	/* Channel priority 3 */
	dmacHw_CHANNEL_PRIORITY_4 = dmacHw_REG_CFG_LO_CH_PRIORITY_4,	/* Channel priority 4 */
	dmacHw_CHANNEL_PRIORITY_5 = dmacHw_REG_CFG_LO_CH_PRIORITY_5,	/* Channel priority 5 */
	dmacHw_CHANNEL_PRIORITY_6 = dmacHw_REG_CFG_LO_CH_PRIORITY_6,	/* Channel priority 6 */
	dmacHw_CHANNEL_PRIORITY_7 = dmacHw_REG_CFG_LO_CH_PRIORITY_7	/* Channel priority 7. Highest priority DMA channel */
} dmacHw_CHANNEL_PRIORITY_e;

/* Source destination master interface */
typedef enum {
	dmacHw_SRC_MASTER_INTERFACE_1 = dmacHw_REG_CTL_SMS_1,	/* Source DMA master interface 1 */
	dmacHw_SRC_MASTER_INTERFACE_2 = dmacHw_REG_CTL_SMS_2,	/* Source DMA master interface 2 */
	dmacHw_DST_MASTER_INTERFACE_1 = dmacHw_REG_CTL_DMS_1,	/* Destination DMA master interface 1 */
	dmacHw_DST_MASTER_INTERFACE_2 = dmacHw_REG_CTL_DMS_2	/* Destination DMA master interface 2 */
} dmacHw_MASTER_INTERFACE_e;

typedef enum {
	dmacHw_SRC_TRANSACTION_WIDTH_8 = dmacHw_REG_CTL_SRC_TR_WIDTH_8,	/* Source 8 bit  (1 byte) per transaction */
	dmacHw_SRC_TRANSACTION_WIDTH_16 = dmacHw_REG_CTL_SRC_TR_WIDTH_16,	/* Source 16 bit (2 byte) per transaction */
	dmacHw_SRC_TRANSACTION_WIDTH_32 = dmacHw_REG_CTL_SRC_TR_WIDTH_32,	/* Source 32 bit (4 byte) per transaction */
	dmacHw_SRC_TRANSACTION_WIDTH_64 = dmacHw_REG_CTL_SRC_TR_WIDTH_64,	/* Source 64 bit (8 byte) per transaction */
	dmacHw_DST_TRANSACTION_WIDTH_8 = dmacHw_REG_CTL_DST_TR_WIDTH_8,	/* Destination 8 bit  (1 byte) per transaction */
	dmacHw_DST_TRANSACTION_WIDTH_16 = dmacHw_REG_CTL_DST_TR_WIDTH_16,	/* Destination 16 bit (2 byte) per transaction */
	dmacHw_DST_TRANSACTION_WIDTH_32 = dmacHw_REG_CTL_DST_TR_WIDTH_32,	/* Destination 32 bit (4 byte) per transaction */
	dmacHw_DST_TRANSACTION_WIDTH_64 = dmacHw_REG_CTL_DST_TR_WIDTH_64	/* Destination 64 bit (8 byte) per transaction */
} dmacHw_TRANSACTION_WIDTH_e;

typedef enum {
	dmacHw_SRC_BURST_WIDTH_0 = dmacHw_REG_CTL_SRC_MSIZE_0,	/* Source No burst */
	dmacHw_SRC_BURST_WIDTH_4 = dmacHw_REG_CTL_SRC_MSIZE_4,	/* Source 4  X dmacHw_TRANSACTION_WIDTH_xxx bytes per burst */
	dmacHw_SRC_BURST_WIDTH_8 = dmacHw_REG_CTL_SRC_MSIZE_8,	/* Source 8  X dmacHw_TRANSACTION_WIDTH_xxx bytes per burst */
	dmacHw_SRC_BURST_WIDTH_16 = dmacHw_REG_CTL_SRC_MSIZE_16,	/* Source 16 X dmacHw_TRANSACTION_WIDTH_xxx bytes per burst */
	dmacHw_DST_BURST_WIDTH_0 = dmacHw_REG_CTL_DST_MSIZE_0,	/* Destination No burst */
	dmacHw_DST_BURST_WIDTH_4 = dmacHw_REG_CTL_DST_MSIZE_4,	/* Destination 4  X dmacHw_TRANSACTION_WIDTH_xxx bytes per burst */
	dmacHw_DST_BURST_WIDTH_8 = dmacHw_REG_CTL_DST_MSIZE_8,	/* Destination 8  X dmacHw_TRANSACTION_WIDTH_xxx bytes per burst */
	dmacHw_DST_BURST_WIDTH_16 = dmacHw_REG_CTL_DST_MSIZE_16	/* Destination 16 X dmacHw_TRANSACTION_WIDTH_xxx bytes per burst */
} dmacHw_BURST_WIDTH_e;

typedef enum {
	dmacHw_TRANSFER_TYPE_MEM_TO_MEM = dmacHw_REG_CTL_TTFC_MM_DMAC,	/* Memory to memory transfer */
	dmacHw_TRANSFER_TYPE_PERIPHERAL_TO_MEM = dmacHw_REG_CTL_TTFC_PM_DMAC,	/* Peripheral to memory transfer */
	dmacHw_TRANSFER_TYPE_MEM_TO_PERIPHERAL = dmacHw_REG_CTL_TTFC_MP_DMAC,	/* Memory to peripheral transfer */
	dmacHw_TRANSFER_TYPE_PERIPHERAL_TO_PERIPHERAL = dmacHw_REG_CTL_TTFC_PP_DMAC	/* Peripheral to peripheral transfer */
} dmacHw_TRANSFER_TYPE_e;

typedef enum {
	dmacHw_TRANSFER_MODE_PERREQUEST,	/* Block transfer per DMA request */
	dmacHw_TRANSFER_MODE_CONTINUOUS,	/* Continuous transfer of streaming data */
	dmacHw_TRANSFER_MODE_PERIODIC	/* Periodic transfer of streaming data */
} dmacHw_TRANSFER_MODE_e;

typedef enum {
	dmacHw_SRC_ADDRESS_UPDATE_MODE_INC = dmacHw_REG_CTL_SINC_INC,	/* Increment source address after every transaction */
	dmacHw_SRC_ADDRESS_UPDATE_MODE_DEC = dmacHw_REG_CTL_SINC_DEC,	/* Decrement source address after every transaction */
	dmacHw_DST_ADDRESS_UPDATE_MODE_INC = dmacHw_REG_CTL_DINC_INC,	/* Increment destination address after every transaction */
	dmacHw_DST_ADDRESS_UPDATE_MODE_DEC = dmacHw_REG_CTL_DINC_DEC,	/* Decrement destination address after every transaction */
	dmacHw_SRC_ADDRESS_UPDATE_MODE_NC = dmacHw_REG_CTL_SINC_NC,	/* No change in source address after every transaction */
	dmacHw_DST_ADDRESS_UPDATE_MODE_NC = dmacHw_REG_CTL_DINC_NC	/* No change in destination address after every transaction */
} dmacHw_ADDRESS_UPDATE_MODE_e;

typedef enum {
	dmacHw_FLOW_CONTROL_DMA,	/* DMA working as flow controller (default) */
	dmacHw_FLOW_CONTROL_PERIPHERAL	/* Peripheral working as flow controller */
} dmacHw_FLOW_CONTROL_e;

typedef enum {
	dmacHw_TRANSFER_STATUS_BUSY,	/* DMA Transfer ongoing */
	dmacHw_TRANSFER_STATUS_DONE,	/* DMA Transfer completed */
	dmacHw_TRANSFER_STATUS_ERROR	/* DMA Transfer error */
} dmacHw_TRANSFER_STATUS_e;

typedef enum {
	dmacHw_INTERRUPT_DISABLE,	/* Interrupt disable  */
	dmacHw_INTERRUPT_ENABLE	/* Interrupt enable */
} dmacHw_INTERRUPT_e;

typedef enum {
	dmacHw_INTERRUPT_STATUS_NONE = 0x0,	/* No DMA interrupt */
	dmacHw_INTERRUPT_STATUS_TRANS = 0x1,	/* End of DMA transfer interrupt */
	dmacHw_INTERRUPT_STATUS_BLOCK = 0x2,	/* End of block transfer interrupt */
	dmacHw_INTERRUPT_STATUS_ERROR = 0x4	/* Error interrupt */
} dmacHw_INTERRUPT_STATUS_e;

typedef enum {
	dmacHw_CONTROLLER_ATTRIB_CHANNEL_NUM,	/* Number of DMA channel */
	dmacHw_CONTROLLER_ATTRIB_CHANNEL_MAX_BLOCK_SIZE,	/* Maximum channel burst size */
	dmacHw_CONTROLLER_ATTRIB_MASTER_INTF_NUM,	/* Number of DMA master interface */
	dmacHw_CONTROLLER_ATTRIB_CHANNEL_BUS_WIDTH,	/* Channel Data bus width */
	dmacHw_CONTROLLER_ATTRIB_CHANNEL_FIFO_SIZE	/* Channel FIFO size */
} dmacHw_CONTROLLER_ATTRIB_e;

typedef unsigned long dmacHw_HANDLE_t;	/* DMA channel handle */
typedef uint32_t dmacHw_ID_t;	/* DMA channel Id.  Must be created using
				   "dmacHw_MAKE_CHANNEL_ID" macro
				 */
/* DMA channel configuration parameters */
typedef struct {
	uint32_t srcPeripheralPort;	/* Source peripheral port */
	uint32_t dstPeripheralPort;	/* Destination peripheral port */
	uint32_t srcStatusRegisterAddress;	/* Source status register address */
	uint32_t dstStatusRegisterAddress;	/* Destination status register address of type  */

	uint32_t srcGatherWidth;	/* Number of bytes gathered before successive gather opearation */
	uint32_t srcGatherJump;	/* Number of bytes jumpped before successive gather opearation */
	uint32_t dstScatterWidth;	/* Number of bytes sacattered before successive scatter opearation */
	uint32_t dstScatterJump;	/* Number of bytes jumpped  before successive scatter opearation */
	uint32_t maxDataPerBlock;	/* Maximum number of bytes to be transferred per block/descrptor.
					   0 = Maximum possible.
					 */

	dmacHw_ADDRESS_UPDATE_MODE_e srcUpdate;	/* Source address update mode */
	dmacHw_ADDRESS_UPDATE_MODE_e dstUpdate;	/* Destination address update mode */
	dmacHw_TRANSFER_TYPE_e transferType;	/* DMA transfer type  */
	dmacHw_TRANSFER_MODE_e transferMode;	/* DMA transfer mode */
	dmacHw_MASTER_INTERFACE_e srcMasterInterface;	/* DMA source interface  */
	dmacHw_MASTER_INTERFACE_e dstMasterInterface;	/* DMA destination interface */
	dmacHw_TRANSACTION_WIDTH_e srcMaxTransactionWidth;	/* Source transaction width   */
	dmacHw_TRANSACTION_WIDTH_e dstMaxTransactionWidth;	/* Destination transaction width */
	dmacHw_BURST_WIDTH_e srcMaxBurstWidth;	/* Source burst width */
	dmacHw_BURST_WIDTH_e dstMaxBurstWidth;	/* Destination burst width */
	dmacHw_INTERRUPT_e blockTransferInterrupt;	/* Block trsnafer interrupt */
	dmacHw_INTERRUPT_e completeTransferInterrupt;	/* Complete DMA trsnafer interrupt */
	dmacHw_INTERRUPT_e errorInterrupt;	/* Error interrupt */
	dmacHw_CHANNEL_PRIORITY_e channelPriority;	/* Channel priority */
	dmacHw_FLOW_CONTROL_e flowControler;	/* Data flow controller */
} dmacHw_CONFIG_t;

/****************************************************************************/
/**
*  @brief   Initializes DMA
*
*  This function initializes DMA CSP driver
*
*  @note
*     Must be called before using any DMA channel
*/
/****************************************************************************/
void dmacHw_initDma(void);

/****************************************************************************/
/**
*  @brief   Exit function for  DMA
*
*  This function isolates DMA from the system
*
*/
/****************************************************************************/
void dmacHw_exitDma(void);

/****************************************************************************/
/**
*  @brief   Gets a handle to a DMA channel
*
*  This function returns a handle, representing a control block of a particular DMA channel
*
*  @return  -1       - On Failure
*            handle  - On Success, representing a channel control block
*
*  @note
*     None  Channel ID must be created using "dmacHw_MAKE_CHANNEL_ID" macro
*/
/****************************************************************************/
dmacHw_HANDLE_t dmacHw_getChannelHandle(dmacHw_ID_t channelId	/* [ IN ] DMA Channel Id */
    );

/****************************************************************************/
/**
*  @brief   Initializes a DMA channel for use
*
*  This function initializes and resets a DMA channel for use
*
*  @return  -1     - On Failure
*            0     - On Success
*
*  @note
*     None
*/
/****************************************************************************/
int dmacHw_initChannel(dmacHw_HANDLE_t handle	/*  [ IN ] DMA Channel handle  */
    );

/****************************************************************************/
/**
*  @brief  Estimates number of descriptor needed to perform certain DMA transfer
*
*
*  @return  On failure : -1
*           On success : Number of descriptor count
*
*
*/
/****************************************************************************/
int dmacHw_calculateDescriptorCount(dmacHw_CONFIG_t *pConfig,	/*   [ IN ] Configuration settings */
				    void *pSrcAddr,	/*   [ IN ] Source (Peripheral/Memory) address */
				    void *pDstAddr,	/*   [ IN ] Destination (Peripheral/Memory) address */
				    size_t dataLen	/*   [ IN ] Data length in bytes */
    );

/****************************************************************************/
/**
*  @brief   Initializes descriptor ring
*
*  This function will initializes the descriptor ring of a DMA channel
*
*
*  @return   -1 - On failure
*             0 - On success
*  @note
*     - "len" parameter should be obtained from "dmacHw_descriptorLen"
*     - Descriptor buffer MUST be 32 bit aligned and uncached as it
*       is accessed by ARM and DMA
*/
/****************************************************************************/
int dmacHw_initDescriptor(void *pDescriptorVirt,	/*  [ IN ] Virtual address of uncahced buffer allocated to form descriptor ring */
			  uint32_t descriptorPhyAddr,	/*  [ IN ] Physical address of pDescriptorVirt (descriptor buffer) */
			  uint32_t len,	/*  [ IN ] Size of the pBuf */
			  uint32_t num	/*  [ IN ] Number of descriptor in the ring */
    );

/****************************************************************************/
/**
*  @brief  Finds amount of memory required to form a descriptor ring
*
*
*  @return   Number of bytes required to form a descriptor ring
*
*
*  @note
*     None
*/
/****************************************************************************/
uint32_t dmacHw_descriptorLen(uint32_t descCnt	/*  [ IN ] Number of descriptor in the ring */
    );

/****************************************************************************/
/**
*  @brief   Configure DMA channel
*
*  @return  0  : On success
*           -1 : On failure
*/
/****************************************************************************/
int dmacHw_configChannel(dmacHw_HANDLE_t handle,	/*  [ IN ] DMA Channel handle  */
			 dmacHw_CONFIG_t *pConfig	/*   [ IN ] Configuration settings */
    );

/****************************************************************************/
/**
*  @brief   Set descriptors for known data length
*
*  When DMA has to work as a flow controller, this function prepares the
*  descriptor chain to transfer data
*
*  from:
*          - Memory to memory
*          - Peripheral to memory
*          - Memory to Peripheral
*          - Peripheral to Peripheral
*
*  @return   -1 - On failure
*             0 - On success
*
*/
/****************************************************************************/
int dmacHw_setDataDescriptor(dmacHw_CONFIG_t *pConfig,	/*  [ IN ] Configuration settings */
			     void *pDescriptor,	/*  [ IN ] Descriptor buffer  */
			     void *pSrcAddr,	/*  [ IN ] Source (Peripheral/Memory) address */
			     void *pDstAddr,	/*  [ IN ] Destination (Peripheral/Memory) address */
			     size_t dataLen	/*  [ IN ] Length in bytes   */
    );

/****************************************************************************/
/**
*  @brief   Indicates whether DMA transfer is in progress or completed
*
*  @return   DMA transfer status
*          dmacHw_TRANSFER_STATUS_BUSY:         DMA Transfer ongoing
*          dmacHw_TRANSFER_STATUS_DONE:         DMA Transfer completed
*          dmacHw_TRANSFER_STATUS_ERROR:        DMA Transfer error
*
*/
/****************************************************************************/
dmacHw_TRANSFER_STATUS_e dmacHw_transferCompleted(dmacHw_HANDLE_t handle	/*   [ IN ] DMA Channel handle  */
    );

/****************************************************************************/
/**
*  @brief   Set descriptor carrying control information
*
*  This function will be used to send specific control information to the device
*  using the DMA channel
*
*
*  @return  -1 - On failure
*            0 - On success
*
*  @note
*     None
*/
/****************************************************************************/
int dmacHw_setControlDescriptor(dmacHw_CONFIG_t *pConfig,	/*  [ IN ] Configuration settings */
				void *pDescriptor,	/*  [ IN ] Descriptor buffer  */
				uint32_t ctlAddress,	/*  [ IN ] Address of the device control register  */
				uint32_t control	/*  [ IN ] Device control information */
    );

/****************************************************************************/
/**
*  @brief   Read data DMA transferred to memory
*
*  This function will read data that has been DMAed to memory while transfering from:
*          - Memory to memory
*          - Peripheral to memory
*
*  @return  0 - No more data is available to read
*           1 - More data might be available to read
*
*/
/****************************************************************************/
int dmacHw_readTransferredData(dmacHw_HANDLE_t handle,	/*  [ IN ] DMA Channel handle    */
			       dmacHw_CONFIG_t *pConfig,	/*  [ IN ]  Configuration settings */
			       void *pDescriptor,	/*  [ IN ] Descriptor buffer  */
			       void **ppBbuf,	/*  [ OUT ] Data received */
			       size_t *pLlen	/*  [ OUT ] Length of the data received */
    );

/****************************************************************************/
/**
*  @brief   Prepares descriptor ring, when source peripheral working as a flow controller
*
*  This function will form the descriptor ring by allocating buffers, when source peripheral
*  has to work as a flow controller to transfer data from:
*           - Peripheral to memory.
*
*  @return  -1 - On failure
*            0 - On success
*
*
*  @note
*     None
*/
/****************************************************************************/
int dmacHw_setVariableDataDescriptor(dmacHw_HANDLE_t handle,	/*  [ IN ] DMA Channel handle   */
				     dmacHw_CONFIG_t *pConfig,	/*  [ IN ] Configuration settings */
				     void *pDescriptor,	/*  [ IN ] Descriptor buffer  */
				     uint32_t srcAddr,	/*  [ IN ] Source peripheral address */
				     void *(*fpAlloc) (int len),	/*  [ IN ] Function pointer  that provides destination memory */
				     int len,	/*  [ IN ] Number of bytes "fpAlloc" will allocate for destination */
				     int num	/*  [ IN ] Number of descriptor to set */
    );

/****************************************************************************/
/**
*  @brief   Program channel register to initiate transfer
*
*  @return  void
*
*
*  @note
*     - Descriptor buffer MUST ALWAYS be flushed before calling this function
*     - This function should also be called from ISR to program the channel with
*       pending descriptors
*/
/****************************************************************************/
void dmacHw_initiateTransfer(dmacHw_HANDLE_t handle,	/*   [ IN ] DMA Channel handle */
			     dmacHw_CONFIG_t *pConfig,	/*   [ IN ] Configuration settings */
			     void *pDescriptor	/*   [ IN ] Descriptor buffer  */
    );

/****************************************************************************/
/**
*  @brief   Resets descriptor control information
*
*  @return  void
*/
/****************************************************************************/
void dmacHw_resetDescriptorControl(void *pDescriptor	/*   [ IN ] Descriptor buffer  */
    );

/****************************************************************************/
/**
*  @brief   Program channel register to stop transfer
*
*  Ensures the channel is not doing any transfer after calling this function
*
*  @return  void
*
*/
/****************************************************************************/
void dmacHw_stopTransfer(dmacHw_HANDLE_t handle	/*   [ IN ] DMA Channel handle */
    );

/****************************************************************************/
/**
*  @brief   Check the existance of pending descriptor
*
*  This function confirmes if there is any pending descriptor in the chain
*  to program the channel
*
*  @return  1 : Channel need to be programmed with pending descriptor
*           0 : No more pending descriptor to programe the channel
*
*  @note
*     - This function should be called from ISR in case there are pending
*       descriptor to program the channel.
*
*     Example:
*
*     dmac_isr ()
*     {
*         ...
*         if (dmacHw_descriptorPending (handle))
*         {
*            dmacHw_initiateTransfer (handle);
*         }
*     }
*
*/
/****************************************************************************/
uint32_t dmacHw_descriptorPending(dmacHw_HANDLE_t handle,	/*   [ IN ] DMA Channel handle */
				  void *pDescriptor	/*   [ IN ] Descriptor buffer */
    );

/****************************************************************************/
/**
*  @brief   Deallocates source or destination memory, allocated
*
*  This function can be called to deallocate data memory that was DMAed successfully
*
*  @return  -1  - On failure
*            0  - On success
*
*  @note
*     This function will be called ONLY, when source OR destination address is pointing
*     to dynamic memory
*/
/****************************************************************************/
int dmacHw_freeMem(dmacHw_CONFIG_t *pConfig,	/*  [ IN ] Configuration settings */
		   void *pDescriptor,	/*  [ IN ] Descriptor buffer  */
		   void (*fpFree) (void *)	/*  [ IN ] Function pointer to free data memory */
    );

/****************************************************************************/
/**
*  @brief   Clears the interrupt
*
*  This function clears the DMA channel specific interrupt
*
*  @return   N/A
*
*  @note
*     Must be called under the context of ISR
*/
/****************************************************************************/
void dmacHw_clearInterrupt(dmacHw_HANDLE_t handle	/*  [ IN ] DMA Channel handle  */
    );

/****************************************************************************/
/**
*  @brief   Returns the cause of channel specific DMA interrupt
*
*  This function returns the cause of interrupt
*
*  @return  Interrupt status, each bit representing a specific type of interrupt
*           of type dmacHw_INTERRUPT_STATUS_e
*  @note
*           This function should be called under the context of ISR
*/
/****************************************************************************/
dmacHw_INTERRUPT_STATUS_e dmacHw_getInterruptStatus(dmacHw_HANDLE_t handle	/*  [ IN ] DMA Channel handle  */
    );

/****************************************************************************/
/**
*  @brief   Indentifies a DMA channel causing interrupt
*
*  This functions returns a channel causing interrupt of type dmacHw_INTERRUPT_STATUS_e
*
*  @return  NULL   : No channel causing DMA interrupt
*           ! NULL : Handle to a channel causing DMA interrupt
*  @note
*     dmacHw_clearInterrupt() must be called with a valid handle after calling this function
*/
/****************************************************************************/
dmacHw_HANDLE_t dmacHw_getInterruptSource(void);

/****************************************************************************/
/**
*  @brief   Sets channel specific user data
*
*  This function associates user data to a specif DMA channel
*
*/
/****************************************************************************/
void dmacHw_setChannelUserData(dmacHw_HANDLE_t handle,	/*  [ IN ] DMA Channel handle  */
			       void *userData	/*  [ IN ] User data  */
    );

/****************************************************************************/
/**
*  @brief   Gets channel specific user data
*
*  This function returns user data specific to a DMA channel
*
*  @return   user data
*/
/****************************************************************************/
void *dmacHw_getChannelUserData(dmacHw_HANDLE_t handle	/*  [ IN ] DMA Channel handle  */
    );

/****************************************************************************/
/**
*  @brief   Displays channel specific registers and other control parameters
*
*
*  @return  void
*
*  @note
*     None
*/
/****************************************************************************/
void dmacHw_printDebugInfo(dmacHw_HANDLE_t handle,	/*  [ IN ] DMA Channel handle  */
			   void *pDescriptor,	/*  [ IN ] Descriptor buffer  */
			   int (*fpPrint) (const char *, ...)	/*  [ IN ] Print callback function */
    );

/****************************************************************************/
/**
*  @brief   Provides DMA controller attributes
*
*
*  @return  DMA controller attributes
*
*  @note
*     None
*/
/****************************************************************************/
uint32_t dmacHw_getDmaControllerAttribute(dmacHw_HANDLE_t handle,	/*  [ IN ]  DMA Channel handle  */
					  dmacHw_CONTROLLER_ATTRIB_e attr	/*  [ IN ]  DMA Controler attribute of type  dmacHw_CONTROLLER_ATTRIB_e */
    );

#endif /* _DMACHW_H */