Blackfin: shutdown video DMA when booting Linux
[oweals/u-boot.git] / arch / blackfin / lib / outs.S
1 /*
2  * Implementation of outs{bwl} for BlackFin processors using zero overhead loops.
3  *
4  * Copyright 2005-2009 Analog Devices Inc.
5  *                2005 BuyWays BV
6  *                      Bas Vermeulen <bas@buyways.nl>
7  *
8  * Licensed under the GPL-2.
9  */
10
11 #include <asm/linkage.h>
12
13 .align 2
14
15 ENTRY(_outsl)
16         P0 = R0;        /* P0 = port */
17         P1 = R1;        /* P1 = address */
18         P2 = R2;        /* P2 = count */
19
20         LSETUP( .Llong_loop_s, .Llong_loop_e) LC0 = P2;
21 .Llong_loop_s: R0 = [P1++];
22 .Llong_loop_e: [P0] = R0;
23         RTS;
24 ENDPROC(_outsl)
25
26 ENTRY(_outsw)
27         P0 = R0;        /* P0 = port */
28         P1 = R1;        /* P1 = address */
29         P2 = R2;        /* P2 = count */
30
31         LSETUP( .Lword_loop_s, .Lword_loop_e) LC0 = P2;
32 .Lword_loop_s: R0 = W[P1++];
33 .Lword_loop_e: W[P0] = R0;
34         RTS;
35 ENDPROC(_outsw)
36
37 ENTRY(_outsb)
38         P0 = R0;        /* P0 = port */
39         P1 = R1;        /* P1 = address */
40         P2 = R2;        /* P2 = count */
41
42         LSETUP( .Lbyte_loop_s, .Lbyte_loop_e) LC0 = P2;
43 .Lbyte_loop_s: R0 = B[P1++];
44 .Lbyte_loop_e: B[P0] = R0;
45         RTS;
46 ENDPROC(_outsb)
47
48 ENTRY(_outsw_8)
49         P0 = R0;        /* P0 = port */
50         P1 = R1;        /* P1 = address */
51         P2 = R2;        /* P2 = count */
52
53         LSETUP( .Lword8_loop_s, .Lword8_loop_e) LC0 = P2;
54 .Lword8_loop_s: R1 = B[P1++];
55                 R0 = B[P1++];
56                 R0 = R0 << 8;
57                 R0 = R0 + R1;
58 .Lword8_loop_e: W[P0] = R0;
59         RTS;
60 ENDPROC(_outsw_8)