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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 8327 | maxcodehac | 1 | #include "pxa255_DMA.h" |
| 2 | #include "mem.h" |
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| 3 | |||
| 4 | #define REG_DAR 0 |
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| 5 | #define REG_SAR 1 |
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| 6 | #define REG_TAR 2 |
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| 7 | #define REG_CR 3 |
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| 8 | #define REG_CSR 4 |
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| 9 | |||
| 10 | |||
| 11 | static void pxa255dmaPrvChannelRegWrite(_UNUSED_ Pxa255dma* dma, UInt8 channel, UInt8 reg, UInt32 val){ |
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| 12 | |||
| 13 | if(val){ //we start with zeros, so non-zero writes are all we care about |
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| 14 | |||
| 15 | const char* regs[] = {"DADDR", "SADDR", "TADDR", "CR", "CSR"}; |
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| 16 | |||
| 17 | err_str("dma: writes unimpl!"); |
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| 18 | // err_str("PXA255 dma engine: writes unimpl! (writing 0x"); |
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| 19 | // err_hex(val); |
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| 20 | // err_str(" to channel "); |
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| 21 | // err_dec(channel); |
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| 22 | // err_str(" reg "); |
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| 23 | // err_str(regs[reg]); |
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| 24 | // err_str(". Halting.\r\n"); |
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| 25 | while(1); |
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| 26 | } |
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| 27 | } |
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| 28 | |||
| 29 | static UInt32 pxa255dmaPrvChannelRegRead(_UNUSED_ Pxa255dma* dma, _UNUSED_ UInt8 channel, _UNUSED_ UInt8 reg){ |
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| 30 | |||
| 31 | |||
| 32 | return 0; |
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| 33 | } |
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| 34 | |||
| 35 | static Boolean pxa255dmaPrvMemAccessF(void* userData, UInt32 pa, UInt8 size, Boolean write, void* buf){ |
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| 36 | |||
| 37 | Pxa255dma* dma = userData; |
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| 38 | UInt8 reg, set; |
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| 39 | UInt32 val = 0; |
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| 40 | |||
| 41 | if(size != 4) { |
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| 42 | err_str(__FILE__ ": Unexpected "); |
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| 43 | // err_str(write ? "write" : "read"); |
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| 44 | // err_str(" of "); |
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| 45 | // err_dec(size); |
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| 46 | // err_str(" bytes to 0x"); |
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| 47 | // err_hex(pa); |
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| 48 | // err_str("\r\n"); |
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| 49 | return true; //we do not support non-word accesses |
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| 50 | } |
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| 51 | |||
| 52 | pa = (pa - PXA255_DMA_BASE) >> 2; |
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| 53 | |||
| 54 | if(write){ |
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| 55 | val = *(UInt32*)buf; |
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| 56 | |||
| 57 | switch(pa >> 6){ //weird, but quick way to avoide repeated if-then-elses. this is faster |
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| 58 | case 0: |
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| 59 | if(pa < 16){ |
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| 60 | reg = REG_CSR; |
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| 61 | set = pa; |
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| 62 | pxa255dmaPrvChannelRegWrite(dma, set, reg, val); |
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| 63 | } |
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| 64 | break; |
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| 65 | |||
| 66 | case 1: |
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| 67 | pa -= 64; |
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| 68 | if(pa < 40) dma->CMR[pa] = val; |
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| 69 | break; |
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| 70 | |||
| 71 | case 2: |
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| 72 | pa -= 128; |
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| 73 | set = pa >> 2; |
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| 74 | reg = pa & 3; |
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| 75 | pxa255dmaPrvChannelRegWrite(dma, set, reg, val); |
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| 76 | break; |
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| 77 | } |
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| 78 | } |
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| 79 | else{ |
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| 80 | switch(pa >> 6){ //weird, but quick way to avoide repeated if-then-elses. this is faster |
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| 81 | case 0: |
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| 82 | if(pa < 16){ |
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| 83 | reg = REG_CSR; |
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| 84 | set = pa; |
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| 85 | val = pxa255dmaPrvChannelRegRead(dma, set, reg); |
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| 86 | } |
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| 87 | break; |
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| 88 | |||
| 89 | case 1: |
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| 90 | pa -= 64; |
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| 91 | if(pa < 40) val = dma->CMR[pa]; |
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| 92 | break; |
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| 93 | |||
| 94 | case 2: |
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| 95 | pa -= 128; |
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| 96 | set = pa >> 2; |
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| 97 | reg = pa & 3; |
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| 98 | val = pxa255dmaPrvChannelRegRead(dma, set, reg); |
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| 99 | break; |
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| 100 | } |
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| 101 | |||
| 102 | *(UInt32*)buf = val; |
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| 103 | } |
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| 104 | |||
| 105 | return true; |
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| 106 | } |
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| 107 | |||
| 108 | |||
| 109 | Boolean pxa255dmaInit(Pxa255dma* dma, ArmMem* physMem, Pxa255ic* ic){ |
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| 110 | |||
| 111 | __mem_zero(dma, sizeof(Pxa255dma)); |
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| 112 | dma->ic = ic; |
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| 113 | dma->mem = physMem; |
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| 114 | |||
| 115 | return memRegionAdd(physMem, PXA255_DMA_BASE, PXA255_DMA_SIZE, pxa255dmaPrvMemAccessF, dma); |
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| 116 | } |