//*****************************************************************************
//
// Configures the VIMS.
//
//*****************************************************************************
void
VIMSConfigure(uint32_t ui32Base, bool bRoundRobin, bool bPrefetch)
{
uint32_t ui32Reg;
//
// Check the arguments.
//
ASSERT(VIMSBaseValid(ui32Base));
ui32Reg = HWREG(ui32Base + VIMS_O_CTL);
ui32Reg &= ~(VIMS_CTL_PREF_EN | VIMS_CTL_ARB_CFG);
if(bRoundRobin)
{
ui32Reg |= VIMS_CTL_ARB_CFG;
}
if(bPrefetch)
{
ui32Reg |= VIMS_CTL_PREF_EN;
}
//
// Set the Arbitration and prefetch mode.
//
HWREG(ui32Base + VIMS_O_CTL) = ui32Reg;
}
//*****************************************************************************
//
// Safe setting of new VIMS mode
// - Function might be blocking
// - Can be called for any mode change (also if actually not changing mode)
//
//*****************************************************************************
void
VIMSModeSafeSet( uint32_t ui32Base, uint32_t ui32NewMode, bool blocking )
{
uint32_t currentMode;
// Check the arguments.
ASSERT(VIMSBaseValid(ui32Base));
ASSERT((ui32NewMode == VIMS_MODE_DISABLED) ||
(ui32NewMode == VIMS_MODE_ENABLED) ||
(ui32NewMode == VIMS_MODE_OFF));
// Make sure that only the mode bits are set in the input parameter
// (done just for security since it is critical to the code flow)
ui32NewMode &= VIMS_CTL_MODE_M;
// Wait for any pending change to complete and get current VIMS mode
// (This is a blocking point but will typically only be a blocking point
// only if mode is changed multiple times with blocking=0)
do {
currentMode = VIMSModeGet( ui32Base );
} while ( currentMode == VIMS_MODE_CHANGING );
// First check that it actually is a mode change request
if ( ui32NewMode != currentMode ) {
// Due to a hw-problem it is strongly recommended to go via VIMS_MODE_OFF
// when leaving VIMS_MODE_ENABLED (=VIMS_CTL_MODE_CACHE)
// (And no need to go via OFF, if OFF is the final state and will be set later)
if (( currentMode == VIMS_CTL_MODE_CACHE ) &&
( ui32NewMode != VIMS_CTL_MODE_OFF ) )
{
VIMSModeSet( ui32Base, VIMS_MODE_OFF );
while ( HWREGBITW( VIMS_BASE + VIMS_O_STAT, VIMS_STAT_MODE_CHANGING_BITN )) {
// Do nothing - wait for change to complete.
// (Needed blocking point but it takes only some few cycles)
}
}
// Set new mode
VIMSModeSet( ui32Base, ui32NewMode );
// Wait for final mode change to complete - if blocking is requested
if ( blocking ) {
while ( HWREGBITW( VIMS_BASE + VIMS_O_STAT, VIMS_STAT_MODE_CHANGING_BITN )) {
// Do nothing - wait for change to complete.
}
}
}
}
//*****************************************************************************
//
// Get the current operational mode of the VIMS.
//
//*****************************************************************************
uint32_t
VIMSModeGet(uint32_t ui32Base)
{
uint32_t ui32Reg;
// Check the arguments.
ASSERT(VIMSBaseValid(ui32Base));
ui32Reg = HWREG(ui32Base + VIMS_O_STAT);
if(ui32Reg & VIMS_STAT_MODE_CHANGING)
{
return (VIMS_MODE_CHANGING);
}
else
{
return (ui32Reg & VIMS_STAT_MODE_M);
}
}
//*****************************************************************************
//
// Set the operational mode of the VIMS
//
//*****************************************************************************
void
VIMSModeSet(uint32_t ui32Base, uint32_t ui32Mode)
{
uint32_t ui32Reg;
// Check the arguments.
ASSERT(VIMSBaseValid(ui32Base));
ASSERT((ui32Mode == VIMS_MODE_DISABLED) ||
(ui32Mode == VIMS_MODE_ENABLED) ||
(ui32Mode == VIMS_MODE_OFF));
// Set the mode.
ui32Reg = HWREG(ui32Base + VIMS_O_CTL);
ui32Reg &= ~VIMS_CTL_MODE_M;
ui32Reg |= (ui32Mode & VIMS_CTL_MODE_M);
HWREG(ui32Base + VIMS_O_CTL) = ui32Reg;
}
