source: SVN/rincon/u-boot/cpu/blackfin/serial.c @ 55

Last change on this file since 55 was 55, checked in by Tim Harvey, 2 years ago

rincon: added latest u-boot source

restored form server backup

Signed-off-by: Tim Harvey <tharvey@…>

File size: 2.7 KB
Line 
1/*
2 * U-boot - serial.c Blackfin Serial Driver
3 *
4 * Copyright (c) 2005-2008 Analog Devices Inc.
5 *
6 * Copyright (c) 2003   Bas Vermeulen <bas@buyways.nl>,
7 *                      BuyWays B.V. (www.buyways.nl)
8 *
9 * Based heavily on:
10 * blkfinserial.c: Serial driver for BlackFin DSP internal USRTs.
11 * Copyright(c) 2003    Metrowerks      <mwaddel@metrowerks.com>
12 * Copyright(c) 2001    Tony Z. Kou     <tonyko@arcturusnetworks.com>
13 * Copyright(c) 2001-2002 Arcturus Networks Inc. <www.arcturusnetworks.com>
14 *
15 * Based on code from 68328 version serial driver imlpementation which was:
16 * Copyright (C) 1995       David S. Miller    <davem@caip.rutgers.edu>
17 * Copyright (C) 1998       Kenneth Albanowski <kjahds@kjahds.com>
18 * Copyright (C) 1998, 1999 D. Jeff Dionne     <jeff@uclinux.org>
19 * Copyright (C) 1999       Vladimir Gurevich  <vgurevic@cisco.com>
20 *
21 * (C) Copyright 2000-2004
22 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
23 *
24 * Licensed under the GPL-2 or later.
25 */
26
27#include <common.h>
28#include <watchdog.h>
29#include <asm/blackfin.h>
30#include <asm/mach-common/bits/uart.h>
31
32#if defined(UART_LSR) && (CONFIG_UART_CONSOLE != 0)
33# error CONFIG_UART_CONSOLE must be 0 on parts with only one UART
34#endif
35
36#include "serial.h"
37
38/* Symbol for our assembly to call. */
39void serial_set_baud(uint32_t baud)
40{
41        serial_early_set_baud(baud);
42}
43
44/* Symbol for common u-boot code to call.
45 * Setup the baudrate (brg: baudrate generator).
46 */
47void serial_setbrg(void)
48{
49        DECLARE_GLOBAL_DATA_PTR;
50        serial_set_baud(gd->baudrate);
51}
52
53/* Symbol for our assembly to call. */
54void serial_initialize(void)
55{
56        serial_early_init();
57}
58
59/* Symbol for common u-boot code to call. */
60int serial_init(void)
61{
62        serial_initialize();
63        serial_setbrg();
64        return 0;
65}
66
67void serial_putc(const char c)
68{
69        /* send a \r for compatibility */
70        if (c == '\n')
71                serial_putc('\r');
72
73        WATCHDOG_RESET();
74
75        /* wait for the hardware fifo to clear up */
76        while (!(*pUART_LSR & THRE))
77                continue;
78
79        /* queue the character for transmission */
80        *pUART_THR = c;
81        SSYNC();
82
83        WATCHDOG_RESET();
84
85        /* wait for the byte to be shifted over the line */
86        while (!(*pUART_LSR & TEMT))
87                continue;
88}
89
90int serial_tstc(void)
91{
92        WATCHDOG_RESET();
93        return (*pUART_LSR & DR) ? 1 : 0;
94}
95
96int serial_getc(void)
97{
98        uint16_t uart_lsr_val, uart_rbr_val;
99
100        /* wait for data ! */
101        while (!serial_tstc())
102                continue;
103
104        /* clear the status and grab the new byte */
105        uart_lsr_val = *pUART_LSR;
106        uart_rbr_val = *pUART_RBR;
107
108        if (uart_lsr_val & (OE|PE|FE|BI)) {
109                /* Some parts are read-to-clear while others are
110                 * write-to-clear.  Just do the write for everyone
111                 * since it cant hurt (other than code size).
112                 */
113                *pUART_LSR = (OE|PE|FE|BI);
114                return -1;
115        }
116
117        return uart_rbr_val & 0xFF;
118}
119
120void serial_puts(const char *s)
121{
122        while (*s)
123                serial_putc(*s++);
124}
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