void *pci_alloc_consistent(void *pdev, size_t size, dma_addr_t *dma_handle)
{
IOBufferMemoryDescriptor *memDesc;
IOVirtualAddress virt_address;
IOPhysicalAddress phys_address;
// construct a memory descriptor for a buffer below the 4Gb line,
// addressable by 32 bit DMA and page aligned.
memDesc = IOBufferMemoryDescriptor::inTaskWithOptions(kernel_task,
kIOMemoryPhysicallyContiguous, size, PAGE_SIZE);
if (memDesc) {
IOByteCount offset = 0;
IOByteCount length;
memDesc->prepare();
virt_address = (IOVirtualAddress)memDesc->getBytesNoCopy();
phys_address = memDesc->getPhysicalSegment(offset, &length);
g_bcm_dma_info->setObject(memDesc);
} else {
virt_address = NULL;
phys_address = NULL;
IOLog("pci_alloc_consistent:IOBufferMemoryDescriptor::inTaskWithOptions failed\n");
}
//IOLog("pci_alloc_consistent paddr(0x%X), size(0x%X)\n", (unsigned int)phys_address, size);
*dma_handle = phys_address;
return (void*)virt_address;
}
bool AppleMacIO::selfTest( void )
{
IODBDMADescriptor *dmaDescriptors;
UInt32 dmaDescriptorsPhys;
UInt32 i;
UInt32 status;
IODBDMADescriptor *dmaDesc;
IOBufferMemoryDescriptor *buffer;
volatile IODBDMAChannelRegisters *ioBaseDMA;
bool ok = false;
enum { kTestChannel = 0x8000 };
ioBaseDMA = (volatile IODBDMAChannelRegisters *)
(((UInt32)fMemory->getVirtualAddress())
+ kTestChannel );
do {
buffer = IOBufferMemoryDescriptor::withCapacity(page_size, kIODirectionOutIn, true);
dmaDescriptors = (IODBDMADescriptor*)buffer->getBytesNoCopy();
if (!dmaDescriptors)
continue;
if ( (UInt32)dmaDescriptors & (page_size - 1) ) {
IOLog("AppleMacIO::%s() - DMA Descriptor memory not page aligned!!", __FUNCTION__);
continue;
}
bzero( dmaDescriptors, page_size );
IODBDMAReset( ioBaseDMA );
dmaDesc = dmaDescriptors;
IOMakeDBDMADescriptor( dmaDesc,
kdbdmaNop,
kdbdmaKeyStream0,
kdbdmaIntNever,
kdbdmaBranchNever,
kdbdmaWaitNever,
0,
0 );
dmaDesc++;
dmaDescriptorsPhys = (UInt32) (buffer->getPhysicalSegment(0, NULL, 0));
IOMakeDBDMADescriptorDep( dmaDesc,
kdbdmaStoreQuad,
kdbdmaKeySystem,
kdbdmaIntNever,
kdbdmaBranchNever,
kdbdmaWaitNever,
4,
dmaDescriptorsPhys+16*sizeof(IODBDMADescriptor),
0x12345678 );
dmaDesc++;
IOMakeDBDMADescriptor( dmaDesc,
kdbdmaStop,
kdbdmaKeyStream0,
kdbdmaIntNever,
kdbdmaBranchNever,
kdbdmaWaitNever,
0,
0 );
for ( i = 0; (!ok) && (i < 3); i++ )
{
dmaDescriptors[16].operation = 0;
IOSetDBDMACommandPtr( ioBaseDMA, dmaDescriptorsPhys );
IODBDMAContinue( ioBaseDMA );
IODelay( 200 );
status = IOGetDBDMAChannelStatus( ioBaseDMA );
if ( ((status & kdbdmaActive) == 0)
&& ((status & kdbdmaDead) == 0)
&& (OSReadSwapInt32( &dmaDescriptors[16].operation, 0 ) == 0x12345678 ))
ok = true;
}
IODBDMAReset( ioBaseDMA );
} while (false);
if (buffer)
buffer->release();
return ok;
}
