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
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
/*
* (C) Copyright 2008 - 2015 Michal Simek <monstr@monstr.eu>
* Clean driver and add xilinx constant from header file
*
* (C) Copyright 2004 Atmark Techno, Inc.
* Yasushi SHOJI <yashi@atmark-techno.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <config.h>
#include <common.h>
#include <dm.h>
#include <asm/io.h>
#include <linux/compiler.h>
#include <serial.h>
#define SR_TX_FIFO_FULL BIT(3) /* transmit FIFO full */
#define SR_TX_FIFO_EMPTY BIT(2) /* transmit FIFO empty */
#define SR_RX_FIFO_VALID_DATA BIT(0) /* data in receive FIFO */
#define SR_RX_FIFO_FULL BIT(1) /* receive FIFO full */
#define ULITE_CONTROL_RST_TX 0x01
#define ULITE_CONTROL_RST_RX 0x02
struct uartlite {
unsigned int rx_fifo;
unsigned int tx_fifo;
unsigned int status;
unsigned int control;
};
struct uartlite_platdata {
struct uartlite *regs;
};
static int uartlite_serial_putc(struct udevice *dev, const char ch)
{
struct uartlite_platdata *plat = dev_get_platdata(dev);
struct uartlite *regs = plat->regs;
if (in_be32(®s->status) & SR_TX_FIFO_FULL)
return -EAGAIN;
out_be32(®s->tx_fifo, ch & 0xff);
return 0;
}
static int uartlite_serial_getc(struct udevice *dev)
{
struct uartlite_platdata *plat = dev_get_platdata(dev);
struct uartlite *regs = plat->regs;
if (!(in_be32(®s->status) & SR_RX_FIFO_VALID_DATA))
return -EAGAIN;
return in_be32(®s->rx_fifo) & 0xff;
}
static int uartlite_serial_pending(struct udevice *dev, bool input)
{
struct uartlite_platdata *plat = dev_get_platdata(dev);
struct uartlite *regs = plat->regs;
if (input)
return in_be32(®s->status) & SR_RX_FIFO_VALID_DATA;
return !(in_be32(®s->status) & SR_TX_FIFO_EMPTY);
}
static int uartlite_serial_probe(struct udevice *dev)
{
struct uartlite_platdata *plat = dev_get_platdata(dev);
struct uartlite *regs = plat->regs;
out_be32(®s->control, 0);
out_be32(®s->control, ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX);
in_be32(®s->control);
return 0;
}
static int uartlite_serial_ofdata_to_platdata(struct udevice *dev)
{
struct uartlite_platdata *plat = dev_get_platdata(dev);
plat->regs = (struct uartlite *)devfdt_get_addr(dev);
return 0;
}
static const struct dm_serial_ops uartlite_serial_ops = {
.putc = uartlite_serial_putc,
.pending = uartlite_serial_pending,
.getc = uartlite_serial_getc,
};
static const struct udevice_id uartlite_serial_ids[] = {
{ .compatible = "xlnx,opb-uartlite-1.00.b", },
{ .compatible = "xlnx,xps-uartlite-1.00.a" },
{ }
};
U_BOOT_DRIVER(serial_uartlite) = {
.name = "serial_uartlite",
.id = UCLASS_SERIAL,
.of_match = uartlite_serial_ids,
.ofdata_to_platdata = uartlite_serial_ofdata_to_platdata,
.platdata_auto_alloc_size = sizeof(struct uartlite_platdata),
.probe = uartlite_serial_probe,
.ops = &uartlite_serial_ops,
.flags = DM_FLAG_PRE_RELOC,
};
#ifdef CONFIG_DEBUG_UART_UARTLITE
#include <debug_uart.h>
static inline void _debug_uart_init(void)
{
struct uartlite *regs = (struct uartlite *)CONFIG_DEBUG_UART_BASE;
out_be32(®s->control, 0);
out_be32(®s->control, ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX);
in_be32(®s->control);
}
static inline void _debug_uart_putc(int ch)
{
struct uartlite *regs = (struct uartlite *)CONFIG_DEBUG_UART_BASE;
while (in_be32(®s->status) & SR_TX_FIFO_FULL)
;
out_be32(®s->tx_fifo, ch & 0xff);
}
DEBUG_UART_FUNCS
#endif
|
