source: SVN/rincon/u-boot/cpu/arm920t/ks8695/serial.c @ 55

Last change on this file since 55 was 55, checked in by Tim Harvey, 22 months ago

rincon: added latest u-boot source

restored form server backup

Signed-off-by: Tim Harvey <tharvey@…>

File size: 2.8 KB
Line 
1/*
2 * serial.c -- KS8695 serial driver
3 *
4 * (C) Copyright 2004, Greg Ungerer <greg.ungerer@opengear.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
19 */
20
21#include <common.h>
22#include <asm/arch/platform.h>
23
24#ifndef CONFIG_SERIAL1
25#error "Bad: you didn't configure serial ..."
26#endif
27
28DECLARE_GLOBAL_DATA_PTR;
29
30/*
31 *      Define the UART hardware register access structure.
32 */
33struct ks8695uart {
34        unsigned int    RX;             /* 0x00 - Receive data (r) */
35        unsigned int    TX;             /* 0x04 - Transmit data (w) */
36        unsigned int    FCR;            /* 0x08 - Fifo Control (r/w) */
37        unsigned int    LCR;            /* 0x0c - Line Control (r/w) */
38        unsigned int    MCR;            /* 0x10 - Modem Control (r/w) */
39        unsigned int    LSR;            /* 0x14 - Line Status (r/w) */
40        unsigned int    MSR;            /* 0x18 - Modem Status (r/w) */
41        unsigned int    BD;             /* 0x1c - Baud Rate (r/w) */
42        unsigned int    SR;             /* 0x20 - Status (r/w) */
43};
44
45#define KS8695_UART_ADDR        ((void *) (KS8695_IO_BASE + KS8695_UART_RX_BUFFER))
46#define KS8695_UART_CLK         25000000
47
48
49/*
50 * Under some circumstances we want to be "quiet" and not issue any
51 * serial output - though we want u-boot to otherwise work and behave
52 * the same. By default be noisy.
53 */
54int serial_console = 1;
55
56
57void serial_setbrg(void)
58{
59        volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
60
61        /* Set to global baud rate and 8 data bits, no parity, 1 stop bit*/
62        uartp->BD = KS8695_UART_CLK / gd->baudrate;
63        uartp->LCR = KS8695_UART_LINEC_WLEN8;
64}
65
66int serial_init(void)
67{
68        serial_console = 1;
69        serial_setbrg();
70        return 0;
71}
72
73void serial_raw_putc(const char c)
74{
75        volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
76        int i;
77
78        for (i = 0; (i < 0x100000); i++) {
79                if (uartp->LSR & KS8695_UART_LINES_TXFE)
80                        break;
81        }
82
83        uartp->TX = c;
84}
85
86void serial_putc(const char c)
87{
88        if (serial_console) {
89                serial_raw_putc(c);
90                if (c == '\n')
91                        serial_raw_putc('\r');
92        }
93}
94
95int serial_tstc(void)
96{
97        volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
98        if (serial_console)
99                return ((uartp->LSR & KS8695_UART_LINES_RXFE) ? 1 : 0);
100        return 0;
101}
102
103void serial_puts(const char *s)
104{
105        char c;
106        while ((c = *s++) != 0)
107                serial_putc(c);
108}
109
110int serial_getc(void)
111{
112        volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
113
114        while ((uartp->LSR & KS8695_UART_LINES_RXFE) == 0)
115                ;
116        return (uartp->RX);
117}
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