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
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
/*
* (C) Copyright 2002
* Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <asm/io.h>
#include <asm/ic/ssi.h>
#include <asm/ic/sc520.h>
int ssi_set_interface(int freq, int lsb_first, int inv_clock, int inv_phase)
{
u8 temp=0;
if (freq >= 8192) {
temp |= CTL_CLK_SEL_4;
} else if (freq >= 4096) {
temp |= CTL_CLK_SEL_8;
} else if (freq >= 2048) {
temp |= CTL_CLK_SEL_16;
} else if (freq >= 1024) {
temp |= CTL_CLK_SEL_32;
} else if (freq >= 512) {
temp |= CTL_CLK_SEL_64;
} else if (freq >= 256) {
temp |= CTL_CLK_SEL_128;
} else if (freq >= 128) {
temp |= CTL_CLK_SEL_256;
} else {
temp |= CTL_CLK_SEL_512;
}
if (!lsb_first) {
temp |= MSBF_ENB;
}
if (inv_clock) {
temp |= CLK_INV_ENB;
}
if (inv_phase) {
temp |= PHS_INV_ENB;
}
writeb(temp, &sc520_mmcr->ssictl);
return 0;
}
u8 ssi_txrx_byte(u8 data)
{
writeb(data, &sc520_mmcr->ssixmit);
while (readb(&sc520_mmcr->ssista) & SSISTA_BSY);
writeb(SSICMD_CMD_SEL_XMITRCV, &sc520_mmcr->ssicmd);
while (readb(&sc520_mmcr->ssista) & SSISTA_BSY);
return readb(&sc520_mmcr->ssircv);
}
void ssi_tx_byte(u8 data)
{
writeb(data, &sc520_mmcr->ssixmit);
while (readb(&sc520_mmcr->ssista) & SSISTA_BSY);
writeb(SSICMD_CMD_SEL_XMIT, &sc520_mmcr->ssicmd);
}
u8 ssi_rx_byte(void)
{
while (readb(&sc520_mmcr->ssista) & SSISTA_BSY);
writeb(SSICMD_CMD_SEL_RCV, &sc520_mmcr->ssicmd);
while (readb(&sc520_mmcr->ssista) & SSISTA_BSY);
return readb(&sc520_mmcr->ssircv);
}
|
