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
|
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2024 Jiaxun Yang <jiaxun.yang@flygoat.com>
*/
#include <dm.h>
#include <malloc.h>
#include <serial.h>
#include <asm/platform/simcall.h>
/**
* struct simc_serial_priv - Semihosting serial private data
* @counter: Counter used to fake pending every other call
*/
struct simc_serial_priv {
unsigned int counter;
};
static int simc_serial_getc(struct udevice *dev)
{
char ch = 0;
simc_read(0, &ch, sizeof(ch));
return ch;
}
static int simc_serial_putc(struct udevice *dev, const char ch)
{
char str[2] = {0};
str[0] = ch;
simc_write(1, str, 1);
return 0;
}
static int simc_serial_pending(struct udevice *dev, bool input)
{
struct simc_serial_priv *priv = dev_get_priv(dev);
if (input) {
int res = simc_poll(0);
return res < 0 ? priv->counter++ & 1 : res;
}
return false;
}
static ssize_t smh_serial_puts(struct udevice *dev, const char *s, size_t len)
{
int ret;
ret = simc_write(1, s, len);
return ret;
}
static const struct dm_serial_ops simc_serial_ops = {
.putc = simc_serial_putc,
.puts = smh_serial_puts,
.getc = simc_serial_getc,
.pending = simc_serial_pending,
};
U_BOOT_DRIVER(simc_serial) = {
.name = "serial_xtensa_semihosting",
.id = UCLASS_SERIAL,
.priv_auto = sizeof(struct simc_serial_priv),
.ops = &simc_serial_ops,
.flags = DM_FLAG_PRE_RELOC,
};
U_BOOT_DRVINFO(simc_serial) = {
.name = "serial_xtensa_semihosting",
};
#if CONFIG_IS_ENABLED(DEBUG_UART_XTENSA_SEMIHOSTING)
#include <debug_uart.h>
static inline void _debug_uart_init(void)
{
}
static inline void _debug_uart_putc(int c)
{
simc_serial_putc(NULL, c);
}
DEBUG_UART_FUNCS
#endif
|
