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[pcsx_rearmed.git] / plugins / dfsound / dma.c
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CommitLineData
1/***************************************************************************\r
2 dma.c - description\r
3 -------------------\r
4 begin : Wed May 15 2002\r
5 copyright : (C) 2002 by Pete Bernert\r
6 email : BlackDove@addcom.de\r
7 ***************************************************************************/\r
8/***************************************************************************\r
9 * *\r
10 * This program is free software; you can redistribute it and/or modify *\r
11 * it under the terms of the GNU General Public License as published by *\r
12 * the Free Software Foundation; either version 2 of the License, or *\r
13 * (at your option) any later version. See also the license.txt file for *\r
14 * additional informations. *\r
15 * *\r
16 ***************************************************************************/\r
17\r
18#include "stdafx.h"\r
19\r
20#define _IN_DMA\r
21\r
22#include "externals.h"\r
23#include "registers.h"\r
24\r
25static void set_dma_end(int iSize, unsigned int cycles)\r
26{\r
27 // this must be > psxdma.c dma irq\r
28 // Road Rash also wants a considerable delay, maybe because of fifo?\r
29 cycles += iSize * 20; // maybe\r
30 cycles |= 1; // indicates dma is active\r
31 spu.cycles_dma_end = cycles;\r
32}\r
33\r
34////////////////////////////////////////////////////////////////////////\r
35// READ DMA (many values)\r
36////////////////////////////////////////////////////////////////////////\r
37\r
38void CALLBACK SPUreadDMAMem(unsigned short *pusPSXMem, int iSize,\r
39 unsigned int cycles)\r
40{\r
41 unsigned int addr = spu.spuAddr, irq_addr = regAreaGet(H_SPUirqAddr) << 3;\r
42 int i, irq_after;\r
43\r
44 do_samples_if_needed(cycles, 1, 2);\r
45 irq_after = (irq_addr - addr) & 0x7ffff;\r
46\r
47 for(i = 0; i < iSize; i++)\r
48 {\r
49 *pusPSXMem++ = *(unsigned short *)(spu.spuMemC + addr);\r
50 addr += 2;\r
51 addr &= 0x7fffe;\r
52 }\r
53 if ((spu.spuCtrl & CTRL_IRQ) && irq_after < iSize * 2) {\r
54 log_unhandled("rdma spu irq: %x/%x+%x\n", irq_addr, spu.spuAddr, iSize * 2);\r
55 spu.irqCallback(irq_after);\r
56 }\r
57 spu.spuAddr = addr;\r
58 set_dma_end(iSize, cycles);\r
59}\r
60\r
61////////////////////////////////////////////////////////////////////////\r
62// WRITE DMA (many values)\r
63////////////////////////////////////////////////////////////////////////\r
64\r
65void CALLBACK SPUwriteDMAMem(unsigned short *pusPSXMem, int iSize,\r
66 unsigned int cycles)\r
67{\r
68 unsigned int addr = spu.spuAddr, irq_addr = regAreaGet(H_SPUirqAddr) << 3;\r
69 int i, irq_after;\r
70 \r
71 do_samples_if_needed(cycles, 1, 2);\r
72 irq_after = (irq_addr - addr) & 0x7ffff;\r
73 spu.bMemDirty = 1;\r
74\r
75 if (addr + iSize*2 < 0x80000)\r
76 {\r
77 memcpy(spu.spuMemC + addr, pusPSXMem, iSize*2);\r
78 addr += iSize*2;\r
79 }\r
80 else\r
81 {\r
82 for (i = 0; i < iSize; i++)\r
83 {\r
84 *(unsigned short *)(spu.spuMemC + addr) = *pusPSXMem++;\r
85 addr += 2;\r
86 addr &= 0x7fffe;\r
87 }\r
88 }\r
89 if ((spu.spuCtrl & CTRL_IRQ) && irq_after < iSize * 2) {\r
90 log_unhandled("wdma spu irq: %x/%x+%x (%u)\n",\r
91 irq_addr, spu.spuAddr, iSize * 2, irq_after);\r
92 // this should be consistent with psxdma.c timing\r
93 // might also need more delay like in set_dma_end()\r
94 spu.irqCallback(irq_after);\r
95 }\r
96 spu.spuAddr = addr;\r
97 set_dma_end(iSize, cycles);\r
98}\r
99\r
100////////////////////////////////////////////////////////////////////////\r
101// vim:shiftwidth=1:expandtab\r