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
93
94
|
#include <bsp.h>
#include <libchip/serial.h>
/* XXX hack until real support is available, code copied from libchip */
#define NS16550_RECEIVE_BUFFER 0
#define NS16550_TRANSMIT_BUFFER 0
#define NS16550_INTERRUPT_ENABLE 1
#define NS16550_INTERRUPT_ID 2
#define NS16550_FIFO_CONTROL 2
#define NS16550_LINE_CONTROL 3
#define NS16550_MODEM_CONTROL 4
#define NS16550_LINE_STATUS 5
#define NS16550_MODEM_STATUS 6
#define NS16550_SCRATCH_PAD 7
#define NS16550_FRACTIONAL_DIVIDER 10
/* status bits we use in line status */
#define SP_LSR_TX 0x40
#define SP_LSR_THOLD 0x20
#define SP_LSR_RDY 0x01
static volatile uint8_t *edison_com = (volatile uint8_t *)0xff010180;
void edison_write_polled(int minor, char cChar);
int edison_inbyte_nonblocking_polled(int minor);
static int edison_open(int major, int minor, void *arg)
{
return 0;
}
static int edison_close(int major, int minor, void *arg)
{
return 0;
}
int edison_inbyte_nonblocking_polled(int minor)
{
if ( edison_com[NS16550_LINE_STATUS] & 0x01 )
return (int) edison_com[NS16550_RECEIVE_BUFFER];
return -1;
}
static ssize_t edison_write_support_polled(int minor, const char *buf, size_t len)
{
ssize_t i;
for ( i=0 ; i<len ; i++ ) {
#if 0
if ( (edison_com[NS16550_LINE_STATUS] & SP_LSR_TX) == 0 )
break;
#else
while ( (edison_com[NS16550_LINE_STATUS] & SP_LSR_TX) == 0x00 )
/* wait until ready */;
#endif
edison_com[NS16550_TRANSMIT_BUFFER] = (uint8_t) buf[i];
}
return i;
}
static void edison_init(int minor)
{
}
void edison_write_polled(int minor, char cChar)
{
while ( (edison_com[NS16550_LINE_STATUS] & SP_LSR_TX) == 0x00 )
/* wait until ready */;
edison_com[NS16550_TRANSMIT_BUFFER] = (uint8_t) cChar;
}
static bool edison_probe(int minor)
{
return true;
}
static int edison_set_attributes(int minor, const struct termios *t)
{
return 0;
}
const console_fns edison_fns =
{
edison_probe, /* deviceProbe */
edison_open, /* deviceFirstOpen */
edison_close, /* deviceLastClose */
edison_inbyte_nonblocking_polled, /* deviceRead */
edison_write_support_polled, /* deviceWrite */
edison_init, /* deviceInitialize */
edison_write_polled, /* deviceWritePolled */
edison_set_attributes, /* deviceSetAttributes */
FALSE, /* deviceOutputUsesInterrupts */
};
|
