wct4xxp: Reduce the memory footprint of the hardware echocanceler.

This saves ~300K of kernel memory for each quad or dual span VPM.  Due
to the fact that this change disables caching of the NLP words (among
other things), the time to disable the echocans appears to have
increased by ~1ms.

Before this change:
=======================================================================
0) ! 356.498 us  |  vpm450m_setecmode(); <--- disable
0) ! 387.762 us  |  vpm450m_setecmode(); <--- enable
0) ! 429.839 us  |  vpm450m_setecmode(); <--- disable

]# echo 1 > /proc/sys/vm/drop_caches && free -k
total       used       free     shared    buffers     cached
Mem:       2005352     228368    1776984          0        132
5540
-/+ buffers/cache:     222696    1782656
Swap:       983036          0     983036

After this change:
=======================================================================
0) ! 1109.515 us |  vpm450m_setecmode(); <--- disable
0) ! 339.017 us  |  vpm450m_setecmode(); <--- enable
0) ! 1431.460 us |  vpm450m_setecmode(); <--- disable

]# echo 1 > /proc/sys/vm/drop_caches && free -k
total       used       free     shared    buffers     cached
Mem:       2005352     228080    1777272          0        112
5484
-/+ buffers/cache:     222484    1782868
Swap:       983036          0     983036

Signed-off-by: Shaun Ruffell <sruffell@digium.com>

git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@9750 a0bf4364-ded3-4de4-8d8a-66a801d63aff

1 files changed, 47 insertions, 114 deletions

diff --git a/software/octdeviceapi/oct6100api/oct6100_miscellaneous_priv.h b/software/octdeviceapi/oct6100api/oct6100_miscellaneous_priv.h
index dba94fd..8d4eca6 100644
--- a/software/octdeviceapi/oct6100api/oct6100_miscellaneous_priv.h
+++ b/software/octdeviceapi/oct6100api/oct6100_miscellaneous_priv.h
@@ -231,67 +231,34 @@ IN	f_pulConfigDword		Pointer to the content stored in the API located at the
 
 \*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*/
 #define mOCT6100_RETRIEVE_NLP_CONF_DWORD( f_pApiInst, f_pChanEntry, f_ulAddress, f_pulConfigDword, f_ulResult )	\
-{																												\
-	UINT32	_ulFirstEmptyIndex = 0xFFFFFFFF;																	\
-	UINT32	_i;																									\
-																												\
-	f_ulResult = cOCT6100_ERR_FATAL_8E;																			\
-	(*f_pulConfigDword) = cOCT6100_INVALID_VALUE;																\
-																												\
-	/* Search for the Dword.*/																					\
-	for ( _i = 0; _i < cOCT6100_MAX_NLP_CONF_DWORD; _i++ )														\
-	{																											\
-		if ( ( _ulFirstEmptyIndex == 0xFFFFFFFF ) && ( f_pChanEntry->aulNlpConfDword[ _i ][ 0 ] == 0x0 ) )		\
-			_ulFirstEmptyIndex = _i;																			\
-																												\
-		if ( f_pChanEntry->aulNlpConfDword[ _i ][ 0 ] == f_ulAddress )											\
-		{																										\
-			/* We found the matching Dword.*/																	\
-			(*f_pulConfigDword) = f_pChanEntry->aulNlpConfDword[ _i ][ 1 ];										\
-			f_ulResult = cOCT6100_ERR_OK;																		\
-		}																										\
-	}																											\
-																												\
-	if ( ( _i == cOCT6100_MAX_NLP_CONF_DWORD ) && ( _ulFirstEmptyIndex == 0xFFFFFFFF ) )						\
-	{																											\
-		/* Nothing to do here, a fatal error occured, no memory was left. */									\
-	}																											\
-	else																										\
-	{																											\
-		if ( f_ulResult != cOCT6100_ERR_OK )																	\
-		{																										\
-			tOCT6100_READ_PARAMS	_ReadParams;																\
-			UINT16					_usReadData;																\
-																												\
-			/* We did not found any entry, let's create a new entry.*/											\
-			f_pChanEntry->aulNlpConfDword[ _ulFirstEmptyIndex ][ 0 ] = f_ulAddress;								\
-																												\
-			_ReadParams.pProcessContext = f_pApiInst->pProcessContext;											\
-			mOCT6100_ASSIGN_USER_READ_WRITE_OBJ( f_pApiInst, _ReadParams );										\
-			_ReadParams.ulUserChipId = f_pApiInst->pSharedInfo->ChipConfig.ulUserChipId;						\
-			_ReadParams.pusReadData = &_usReadData;																\
-																												\
-			/* Read the first 16 bits.*/																		\
-			_ReadParams.ulReadAddress = f_ulAddress;															\
-			mOCT6100_DRIVER_READ_API( _ReadParams, f_ulResult );												\
-			if ( f_ulResult == cOCT6100_ERR_OK )																\
-			{																									\
-				/* Save data.*/																					\
-				(*f_pulConfigDword) = _usReadData << 16;														\
-																												\
-				/* Read the last 16 bits .*/																	\
-				_ReadParams.ulReadAddress += 2;																	\
-				mOCT6100_DRIVER_READ_API( _ReadParams, f_ulResult );											\
-				if ( f_ulResult == cOCT6100_ERR_OK )															\
-				{																								\
-					/* Save data.*/																				\
-					(*f_pulConfigDword) |= _usReadData;															\
-					f_ulResult = cOCT6100_ERR_OK;																\
-				}																								\
-			}																									\
-		}																										\
-	}																											\
-}
+{																										\
+	tOCT6100_READ_PARAMS	_ReadParams;																\
+	UINT16					_usReadData;																\
+	f_ulResult = cOCT6100_ERR_FATAL_8E;																	\
+	(*f_pulConfigDword) = cOCT6100_INVALID_VALUE;														\
+																										\
+	_ReadParams.pProcessContext = f_pApiInst->pProcessContext;											\
+	mOCT6100_ASSIGN_USER_READ_WRITE_OBJ(f_pApiInst, _ReadParams);										\
+	_ReadParams.ulUserChipId = f_pApiInst->pSharedInfo->ChipConfig.ulUserChipId;						\
+	_ReadParams.pusReadData = &_usReadData;																\
+																										\
+	/* Read the first 16 bits.*/																		\
+	_ReadParams.ulReadAddress = f_ulAddress;															\
+	mOCT6100_DRIVER_READ_API(_ReadParams, f_ulResult);													\
+	if (f_ulResult == cOCT6100_ERR_OK) {																\
+		/* Save data.*/																					\
+		(*f_pulConfigDword) = _usReadData << 16;														\
+																										\
+		/* Read the last 16 bits .*/																	\
+		_ReadParams.ulReadAddress += 2;																	\
+		mOCT6100_DRIVER_READ_API(_ReadParams, f_ulResult);												\
+		if (f_ulResult == cOCT6100_ERR_OK) {															\
+			/* Save data.*/																				\
+			(*f_pulConfigDword) |= _usReadData;															\
+			f_ulResult = cOCT6100_ERR_OK;																\
+		}																								\
+	}																									\
+}																										\
 
 
 /*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*\
@@ -314,59 +281,25 @@ IN	f_pulConfigDword		content to be stored in the API located at the
 
 \*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*/
 #define mOCT6100_SAVE_NLP_CONF_DWORD( f_pApiInst, f_pChanEntry, f_ulAddress, f_ulConfigDword, f_ulResult )	\
-{																											\
-	UINT32	_i;																								\
-	UINT32	_ulLastValue = 0x0;																				\
-																											\
-	/* Search for the Dword.*/																				\
-	for ( _i = 0; _i < cOCT6100_MAX_NLP_CONF_DWORD; _i++ )													\
-	{																										\
-		if ( f_pChanEntry->aulNlpConfDword[ _i ][ 0 ] == f_ulAddress )										\
-		{																									\
-			/* We found the matching Dword.*/																\
-			_ulLastValue = f_pChanEntry->aulNlpConfDword[ _i ][ 1 ];										\
-			f_pChanEntry->aulNlpConfDword[ _i ][ 1 ] = f_ulConfigDword;										\
-			break;																							\
-		}																									\
-	}																										\
-																											\
-	if ( _i == cOCT6100_MAX_NLP_CONF_DWORD )																\
-	{																										\
-		f_ulResult = cOCT6100_ERR_FATAL_8F;																	\
-	}																										\
-	else																									\
-	{																										\
-		/* Write the config DWORD. */																		\
-		tOCT6100_WRITE_PARAMS	_WriteParams;																\
-																											\
-		_WriteParams.pProcessContext = f_pApiInst->pProcessContext;											\
-		mOCT6100_ASSIGN_USER_READ_WRITE_OBJ( f_pApiInst, _WriteParams )										\
-		_WriteParams.ulUserChipId = f_pApiInst->pSharedInfo->ChipConfig.ulUserChipId;						\
-																											\
-			/* Check if it is worth calling the user function. */											\
-		if ( ( f_ulConfigDword & 0xFFFF0000 ) != ( _ulLastValue & 0xFFFF0000 ) )							\
-		{																									\
-			/* Write the first 16 bits. */																	\
-			_WriteParams.ulWriteAddress = f_ulAddress;														\
-			_WriteParams.usWriteData = (UINT16)((f_ulConfigDword >> 16) & 0xFFFF);							\
-			mOCT6100_DRIVER_WRITE_API( _WriteParams, f_ulResult );											\
-		}																									\
-		else																								\
-		{																									\
-			f_ulResult = cOCT6100_ERR_OK;																	\
-		}																									\
-																											\
-		if ( f_ulResult == cOCT6100_ERR_OK )																\
-		{																									\
-			if ( ( f_ulConfigDword & 0x0000FFFF ) != ( _ulLastValue & 0x0000FFFF ) )						\
-			{																								\
-				/* Write the last word. */																	\
-				_WriteParams.ulWriteAddress = f_ulAddress + 2;												\
-				_WriteParams.usWriteData = (UINT16)(f_ulConfigDword & 0xFFFF);								\
-				mOCT6100_DRIVER_WRITE_API( _WriteParams, f_ulResult );										\
-			}																								\
-		}																									\
-	}																										\
+{																										\
+	/* Write the config DWORD. */																		\
+	tOCT6100_WRITE_PARAMS	_WriteParams;																\
+																										\
+	_WriteParams.pProcessContext = f_pApiInst->pProcessContext;											\
+	mOCT6100_ASSIGN_USER_READ_WRITE_OBJ(f_pApiInst, _WriteParams)										\
+	_WriteParams.ulUserChipId = f_pApiInst->pSharedInfo->ChipConfig.ulUserChipId;						\
+																										\
+	/* Write the first 16 bits. */																		\
+	_WriteParams.ulWriteAddress = f_ulAddress;															\
+	_WriteParams.usWriteData = (UINT16)((f_ulConfigDword >> 16) & 0xFFFF);								\
+	mOCT6100_DRIVER_WRITE_API(_WriteParams, f_ulResult);												\
+																										\
+	if (f_ulResult == cOCT6100_ERR_OK) {																\
+		/* Write the last word. */																		\
+		_WriteParams.ulWriteAddress = f_ulAddress + 2;													\
+		_WriteParams.usWriteData = (UINT16)(f_ulConfigDword & 0xFFFF);									\
+		mOCT6100_DRIVER_WRITE_API(_WriteParams, f_ulResult);											\
+	}																									\
 }