117 lines
2.5 KiB
C
Executable File
117 lines
2.5 KiB
C
Executable File
#include "pxa255_DMA.h"
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#include "mem.h"
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#define REG_DAR 0
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#define REG_SAR 1
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#define REG_TAR 2
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#define REG_CR 3
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#define REG_CSR 4
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static void pxa255dmaPrvChannelRegWrite(_UNUSED_ Pxa255dma* dma, UInt8 channel, UInt8 reg, UInt32 val){
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if(val){ //we start with zeros, so non-zero writes are all we care about
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const char* regs[] = {"DADDR", "SADDR", "TADDR", "CR", "CSR"};
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err_str("dma: writes unimpl!");
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// err_str("PXA255 dma engine: writes unimpl! (writing 0x");
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// err_hex(val);
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// err_str(" to channel ");
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// err_dec(channel);
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// err_str(" reg ");
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// err_str(regs[reg]);
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// err_str(". Halting.\r\n");
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while(1);
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}
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}
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static UInt32 pxa255dmaPrvChannelRegRead(_UNUSED_ Pxa255dma* dma, _UNUSED_ UInt8 channel, _UNUSED_ UInt8 reg){
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return 0;
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}
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static Boolean pxa255dmaPrvMemAccessF(void* userData, UInt32 pa, UInt8 size, Boolean write, void* buf){
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Pxa255dma* dma = userData;
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UInt8 reg, set;
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UInt32 val = 0;
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if(size != 4) {
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err_str(__FILE__ ": Unexpected ");
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// err_str(write ? "write" : "read");
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// err_str(" of ");
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// err_dec(size);
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// err_str(" bytes to 0x");
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// err_hex(pa);
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// err_str("\r\n");
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return true; //we do not support non-word accesses
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}
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pa = (pa - PXA255_DMA_BASE) >> 2;
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if(write){
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val = *(UInt32*)buf;
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switch(pa >> 6){ //weird, but quick way to avoide repeated if-then-elses. this is faster
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case 0:
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if(pa < 16){
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reg = REG_CSR;
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set = pa;
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pxa255dmaPrvChannelRegWrite(dma, set, reg, val);
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}
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break;
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case 1:
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pa -= 64;
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if(pa < 40) dma->CMR[pa] = val;
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break;
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case 2:
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pa -= 128;
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set = pa >> 2;
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reg = pa & 3;
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pxa255dmaPrvChannelRegWrite(dma, set, reg, val);
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break;
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}
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}
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else{
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switch(pa >> 6){ //weird, but quick way to avoide repeated if-then-elses. this is faster
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case 0:
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if(pa < 16){
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reg = REG_CSR;
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set = pa;
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val = pxa255dmaPrvChannelRegRead(dma, set, reg);
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}
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break;
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case 1:
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pa -= 64;
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if(pa < 40) val = dma->CMR[pa];
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break;
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case 2:
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pa -= 128;
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set = pa >> 2;
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reg = pa & 3;
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val = pxa255dmaPrvChannelRegRead(dma, set, reg);
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break;
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}
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*(UInt32*)buf = val;
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}
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return true;
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}
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Boolean pxa255dmaInit(Pxa255dma* dma, ArmMem* physMem, Pxa255ic* ic){
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__mem_zero(dma, sizeof(Pxa255dma));
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dma->ic = ic;
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dma->mem = physMem;
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return memRegionAdd(physMem, PXA255_DMA_BASE, PXA255_DMA_SIZE, pxa255dmaPrvMemAccessF, dma);
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}
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