1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
/*
* Copyright 1996 The Australian National University.
* Copyright 1996 Fujitsu Laboratories Limited
*
* This software may be distributed under the terms of the Gnu
* Public License version 2 or later
*/
/* dma routines for the AP1000 */
#include <asm/ap1000/apservice.h>
#include <asm/ap1000/apreg.h>
#include <linux/mm.h>
#include <linux/malloc.h>
#include <asm/irq.h>
#include <asm/pgtable.h>
#define DMA_MAX_TRANS_SIZE2 (0xfffffc)
int ap_dma_wait(int ch)
{
int i = 0;
while (DMA_IN(ch+DMA_DMST) & DMA_DMST_AC) i++;
return i;
}
/* send some data out a dma channel */
int ap_dma_go(unsigned long ch,unsigned int p,int size,unsigned long cmd)
{
int rest;
p = mmu_v2p(p);
cmd |= DMA_DCMD_ST | DMA_DCMD_TYP_AUTO;
#if 0
if (ap_dma_wait(ch)) {
printk("WARNING: dma started when not complete\n");
}
if (cmd == DMA_DCMD_TD_MD && !(BIF_IN(BIF_SDCSR) & BIF_SDCSR_BG)) {
ap_led(0xAA);
printk("attempt to dma without holding the bus\n");
return -1;
}
#endif
/* reset the dma system */
DMA_OUT(ch + DMA_DMST,DMA_DMST_RST);
if (size <= DMA_MAX_TRANS_SIZE) {
DMA_OUT(ch + DMA_MADDR,(unsigned long)p);
DMA_OUT(ch + DMA_HSKIP,1);
DMA_OUT(ch + DMA_VSKIP,1);
DMA_OUT(ch + DMA_DCMD,cmd | B2W(size));
return 0;
}
if (size <= DMA_MAX_TRANS_SIZE2) {
if(size & 0x3) size += 4;
rest = (size & (DMA_TRANS_BLOCK_SIZE - 1)) >> 2;
if (rest) {
DMA_OUT(ch + DMA_HDRP,(unsigned)p);
p += rest << 2;
}
DMA_OUT(ch + DMA_MADDR,(unsigned)p);
DMA_OUT(ch + DMA_HSKIP,size >> (2 + 6));
DMA_OUT(ch + DMA_VSKIP,1);
DMA_OUT(ch + DMA_DCMD,cmd | (rest << 16) | 64);
return 0;
}
printk("AP1000 DMA operation too big (%d bytes) - aborting\n",size);
return(-1);
}
|
