blob: 406d9d023d6805c6bc4ea6837c50e9fbc11bb694 (
plain)
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
|
/*
* U-boot - serial.c Blackfin Serial Driver
*
* Copyright (c) 2005-2008 Analog Devices Inc.
*
* Copyright (c) 2003 Bas Vermeulen <bas@buyways.nl>,
* BuyWays B.V. (www.buyways.nl)
*
* Based heavily on:
* blkfinserial.c: Serial driver for BlackFin DSP internal USRTs.
* Copyright(c) 2003 Metrowerks <mwaddel@metrowerks.com>
* Copyright(c) 2001 Tony Z. Kou <tonyko@arcturusnetworks.com>
* Copyright(c) 2001-2002 Arcturus Networks Inc. <www.arcturusnetworks.com>
*
* Based on code from 68328 version serial driver imlpementation which was:
* Copyright (C) 1995 David S. Miller <davem@caip.rutgers.edu>
* Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>
* Copyright (C) 1998, 1999 D. Jeff Dionne <jeff@uclinux.org>
* Copyright (C) 1999 Vladimir Gurevich <vgurevic@cisco.com>
*
* (C) Copyright 2000-2004
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* Licensed under the GPL-2 or later.
*/
#include <common.h>
#include <watchdog.h>
#include <asm/blackfin.h>
#include <asm/mach-common/bits/uart.h>
#if defined(UART_LSR) && (CONFIG_UART_CONSOLE != 0)
# error CONFIG_UART_CONSOLE must be 0 on parts with only one UART
#endif
#include "serial.h"
/* Symbol for our assembly to call. */
void serial_set_baud(uint32_t baud)
{
serial_early_set_baud(baud);
}
/* Symbol for common u-boot code to call.
* Setup the baudrate (brg: baudrate generator).
*/
void serial_setbrg(void)
{
DECLARE_GLOBAL_DATA_PTR;
serial_set_baud(gd->baudrate);
}
/* Symbol for our assembly to call. */
void serial_initialize(void)
{
serial_early_init();
}
/* Symbol for common u-boot code to call. */
int serial_init(void)
{
serial_initialize();
serial_setbrg();
return 0;
}
void serial_putc(const char c)
{
/* send a \r for compatibility */
if (c == '\n')
serial_putc('\r');
WATCHDOG_RESET();
/* wait for the hardware fifo to clear up */
while (!(*pUART_LSR & THRE))
continue;
/* queue the character for transmission */
*pUART_THR = c;
SSYNC();
WATCHDOG_RESET();
/* wait for the byte to be shifted over the line */
while (!(*pUART_LSR & TEMT))
continue;
}
int serial_tstc(void)
{
WATCHDOG_RESET();
return (*pUART_LSR & DR) ? 1 : 0;
}
int serial_getc(void)
{
uint16_t uart_lsr_val, uart_rbr_val;
/* wait for data ! */
while (!serial_tstc())
continue;
/* clear the status and grab the new byte */
uart_lsr_val = *pUART_LSR;
uart_rbr_val = *pUART_RBR;
if (uart_lsr_val & (OE|PE|FE|BI)) {
/* Some parts are read-to-clear while others are
* write-to-clear. Just do the write for everyone
* since it cant hurt (other than code size).
*/
*pUART_LSR = (OE|PE|FE|BI);
return -1;
}
return uart_rbr_val & 0xFF;
}
void serial_puts(const char *s)
{
while (*s)
serial_putc(*s++);
}
|
