/**Load the context for a channel to SDMA
*
* <b>Algorithm:</b>\n
* - Send context and poll for answer.
*
* @param *cd_p channel descriptor for channel 0
* @param *buf pointer to context data
* @param channel channel to place the context for
*
* @return none
*/
void
iapi_lowSetContext(channelDescriptor * cd_p, void * buf, unsigned char channel)
{
bufferDescriptor * local_bd_p;
local_bd_p = (bufferDescriptor *)iapi_Phys2Virt(cd_p->ccb_ptr->baseBDptr);
iapi_SetBufferDescriptor( &local_bd_p[0],
C0_SETDM,
(unsigned char)(BD_DONE | BD_INTR | BD_WRAP|BD_EXTD),
(unsigned short)(sizeof(contextData)/4),
buf,
(void *)(2048+(sizeof(contextData)/4)*channel));
/* Send */
iapi_lowStartChannel( cd_p->channelNumber );
iapi_lowSynchChannel( cd_p->channelNumber );
}
/**Load the context for a channel to SDMA
*
* <b>Algorithm:</b>\n
* - Send context and poll for answer.
*
* @param *cd_p channel descriptor for channel 0
* @param *buf pointer to context data
* @param channel channel to place the context for
*
* @return none
*/
void
iapi_lowSetContext(channelDescriptor *cd_p, void *buf, unsigned char channel)
{
bufferDescriptor *local_bd_p;
#ifdef SDMA_SKYE
unsigned char command = 0;
local_bd_p =
(bufferDescriptor *) iapi_Phys2Virt(cd_p->ccb_ptr->baseBDptr);
command = channel << 3;
command = command | C0_SETCTX;
iapi_SetBufferDescriptor(&local_bd_p[0],
command,
(unsigned char)(BD_DONE | BD_INTR | BD_WRAP),
(unsigned short)(sizeof(contextData) / 4),
buf, NULL);
#else
local_bd_p =
(bufferDescriptor *) iapi_Phys2Virt(cd_p->ccb_ptr->baseBDptr);
iapi_SetBufferDescriptor(&local_bd_p[0],
C0_SETDM,
(unsigned char)(BD_DONE | BD_INTR | BD_WRAP |
BD_EXTD),
(unsigned short)(sizeof(contextData) / 4), buf,
(void *)(2048 +
(sizeof(contextData) / 4) * channel));
#endif
/* Send */
iapi_lowStartChannel(cd_p->channelNumber);
iapi_lowSynchChannel(cd_p->channelNumber);
}
/**Send a command on SDMA's channel zero.
* Check if buffer descriptor is already used by the sdma, if yes return
* an error as c0BDNum is wrong.
*
* <b>Notes</b>\n
* There is an upgrade in the script on the Context load command and
* the fact that the context structure has a fixed length of 20 or 24
* depending on SDMA versions.
*
* @return
* - IAPI_SUCCESS
* - -iapi_errno if failure
*/
int
iapi_Channel0Command(channelDescriptor *cd_p, void *buf,
unsigned short nbyte, unsigned char command)
{
channelControlBlock *ccb_p;
bufferDescriptor *bd_p;
int result = IAPI_SUCCESS;
unsigned char chNum;
/*
* Check data structures are properly initialized
*/
/* Channel descriptor validity */
if (cd_p == NULL) {
result = IAPI_ERR_CD_UNINITIALIZED;
iapi_errno = result;
return -result;
}
/* Channel control block validity */
if (cd_p->ccb_ptr == NULL) {
result = IAPI_ERR_CCB_UNINITIALIZED;
iapi_errno = result;
return -result;
}
/* Control block & Descriptpor associated with the channel being worked on */
chNum = cd_p->channelNumber;
ccb_p = cd_p->ccb_ptr;
/* Is channel already in use ? */
if (ccb_p->baseBDptr != NULL) {
result = IAPI_ERR_BD_ALLOCATED | IAPI_ERR_CH_AVAILABLE | chNum;
iapi_errno = result;
return -result;
}
/* Allocation of buffer descriptors */
bd_p = (bufferDescriptor *) MALLOC(sizeof(bufferDescriptor), SDMA_ERAM);
if (bd_p != NULL) {
ccb_p->baseBDptr = (bufferDescriptor *) iapi_Virt2Phys(bd_p);
} else {
result = IAPI_ERR_BD_ALLOCATION | IAPI_ERR_CH_AVAILABLE | chNum;
iapi_errno = result;
return -result;
}
/* Buffer descriptor setting */
iapi_SetBufferDescriptor(bd_p, command, BD_WRAP | BD_DONE | BD_INTR,
nbyte, buf, NULL);
/* Actually the transfer */
iapi_lowStartChannel(cd_p->channelNumber);
iapi_lowSynchChannel(cd_p->channelNumber);
/* Cleaning of allocation */
FREE(bd_p);
ccb_p->baseBDptr = NULL;
return IAPI_SUCCESS;
}
