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#include "PR/os_internal.h"
#include "PR/ultraerror.h"
#include "PR/rcp.h"
#include "PRinternal/osint.h"
// TODO: this comes from a header
#ident "$Revision: 1.17 $"
/**
* Submits an audio buffer to be consumed by the Audio DAC. The audio interface can queue a second DMA while another
* is in progress and automatically begin the next one as soon as the current DMA completes. If there is already a
* second DMA queued (DMA is full), -1 is returned to indicate the buffer could not be submitted.
*
* @param bufPtr Next audio buffer. Must be an 8-byte aligned KSEG0 (0x80XXXXXX) address.
* @param size Length of next audio buffer in bytes, maximum size 0x40000 bytes / 256 KiB. Should be a multiple of 8.
* @return 0 if the DMA was enqueued successfully, -1 if the DMA could not yet be queued.
*/
s32 osAiSetNextBuffer(void* bufPtr, u32 size) {
static u8 hdwrBugFlag = FALSE;
char* bptr;
#if BUILD_VERSION >= VERSION_J
if (__osAiDeviceBusy()) {
return -1;
}
#endif
#ifdef _DEBUG
if ((u32)bufPtr & (8 - 1)) {
__osError(ERR_OSAISETNEXTBUFFER_ADDR, 1, bufPtr);
return -1;
}
if ((u32)size & (8 - 1)) {
__osError(ERR_OSAISETNEXTBUFFER_SIZE, 1, size);
return -1;
}
#endif
bptr = bufPtr;
if (hdwrBugFlag) {
bptr = (u8*)bufPtr - 0x2000;
}
if ((((u32)bufPtr + size) & 0x1fff) == 0) {
hdwrBugFlag = TRUE;
} else {
hdwrBugFlag = FALSE;
}
#if BUILD_VERSION < VERSION_J
//! @bug The __osAiDeviceBusy call should be above the hardware bug workaround to ensure that it was only
//! performed when a transfer was guaranteed to start. If this condition passes and this function returns without
//! submitting a buffer for DMA, the code above will lose track of when to apply the workaround.
if (__osAiDeviceBusy()) {
return -1;
}
#endif
IO_WRITE(AI_DRAM_ADDR_REG, osVirtualToPhysical(bptr));
IO_WRITE(AI_LEN_REG, size);
return 0;
}
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