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wdenk074cff02004-02-24 00:16:43 +00001/*
2 * (C) Copyright 2004
3 * DAVE Srl
4 * http://www.dave-tech.it
5 * http://www.wawnet.biz
6 * mailto:info@wawnet.biz
7 *
8 * (C) Copyright 2002-2004
9 * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
10 *
11 * (C) Copyright 2002
12 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
13 * Marius Groeger <mgroeger@sysgo.de>
14 *
15 * (C) Copyright 2002
16 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
17 * Alex Zuepke <azu@sysgo.de>
18 *
19 * Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
20 *
21 * This program is free software; you can redistribute it and/or modify
22 * it under the terms of the GNU General Public License as published by
23 * the Free Software Foundation; either version 2 of the License, or
24 * (at your option) any later version.
25 *
26 * This program is distributed in the hope that it will be useful,
27 * but WITHOUT ANY WARRANTY; without even the implied warranty of
28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
29 * GNU General Public License for more details.
30 *
31 * You should have received a copy of the GNU General Public License
32 * along with this program; if not, write to the Free Software
33 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
34 *
35 */
36
37#include <common.h>
38#include <asm/hardware.h>
39
Wolfgang Denkd87080b2006-03-31 18:32:53 +020040DECLARE_GLOBAL_DATA_PTR;
41
wdenk074cff02004-02-24 00:16:43 +000042/* flush serial input queue. returns 0 on success or negative error
43 * number otherwise
44 */
45static int serial_flush_input(void)
46{
47 volatile u32 tmp;
48
49 /* keep on reading as long as the receiver is not empty */
50 while(UTRSTAT0&0x01) {
51 tmp = REGB(URXH0);
52 }
53
54 return 0;
55}
56
57
58/* flush output queue. returns 0 on success or negative error number
59 * otherwise
60 */
61static int serial_flush_output(void)
62{
63 /* wait until the transmitter is no longer busy */
64 while(!(UTRSTAT0 & 0x02)) {
65 }
66
67 return 0;
68}
69
70
Marek Vasuteb507662012-09-14 22:39:19 +020071static void s3c44b0_serial_setbrg(void)
wdenk074cff02004-02-24 00:16:43 +000072{
wdenk074cff02004-02-24 00:16:43 +000073 u32 divisor = 0;
74
75 /* get correct divisor */
76 switch(gd->baudrate) {
77
78 case 1200:
79#if CONFIG_S3C44B0_CLOCK_SPEED==66
80 divisor = 3124;
81#elif CONFIG_S3C44B0_CLOCK_SPEED==75
82 divisor = 3905;
83#else
84# error CONFIG_S3C44B0_CLOCK_SPEED undefined
85#endif
86 break;
87
88 case 9600:
89#if CONFIG_S3C44B0_CLOCK_SPEED==66
90 divisor = 390;
91#elif CONFIG_S3C44B0_CLOCK_SPEED==75
92 divisor = 487;
93#else
94# error CONFIG_S3C44B0_CLOCK_SPEED undefined
95#endif
96 break;
97
98 case 19200:
99#if CONFIG_S3C44B0_CLOCK_SPEED==66
100 divisor = 194;
101#elif CONFIG_S3C44B0_CLOCK_SPEED==75
102 divisor = 243;
103#else
104# error CONFIG_S3C44B0_CLOCK_SPEED undefined
105#endif
106 break;
107
108 case 38400:
109#if CONFIG_S3C44B0_CLOCK_SPEED==66
110 divisor = 97;
111#elif CONFIG_S3C44B0_CLOCK_SPEED==75
112 divisor = 121;
113#else
114# error CONFIG_S3C44B0_CLOCK_SPEED undefined
wdenke86e5a02004-10-17 21:12:06 +0000115#endif /* break; */
wdenk074cff02004-02-24 00:16:43 +0000116
117 case 57600:
118#if CONFIG_S3C44B0_CLOCK_SPEED==66
119 divisor = 64;
120#elif CONFIG_S3C44B0_CLOCK_SPEED==75
121 divisor = 80;
122#else
123# error CONFIG_S3C44B0_CLOCK_SPEED undefined
wdenke86e5a02004-10-17 21:12:06 +0000124#endif /* break; */
wdenk074cff02004-02-24 00:16:43 +0000125
126 case 115200:
127#if CONFIG_S3C44B0_CLOCK_SPEED==66
128 divisor = 32;
129#elif CONFIG_S3C44B0_CLOCK_SPEED==75
130 divisor = 40;
131#else
132# error CONFIG_S3C44B0_CLOCK_SPEED undefined
wdenke86e5a02004-10-17 21:12:06 +0000133#endif /* break; */
wdenk074cff02004-02-24 00:16:43 +0000134 }
135
136 serial_flush_output();
137 serial_flush_input();
138 UFCON0 = 0x0;
139 ULCON0 = 0x03;
140 UCON0 = 0x05;
141 UBRDIV0 = divisor;
142
143 UFCON1 = 0x0;
144 ULCON1 = 0x03;
145 UCON1 = 0x05;
146 UBRDIV1 = divisor;
147
148 for(divisor=0; divisor<100; divisor++) {
149 /* NOP */
150 }
151}
152
153
154/*
155 * Initialise the serial port with the given baudrate. The settings
156 * are always 8 data bits, no parity, 1 stop bit, no start bits.
157 *
158 */
Marek Vasuteb507662012-09-14 22:39:19 +0200159static int s3c44b0_serial_init(void)
wdenk074cff02004-02-24 00:16:43 +0000160{
161 serial_setbrg ();
162
163 return (0);
164}
165
166
167/*
168 * Output a single byte to the serial port.
169 */
Marek Vasuteb507662012-09-14 22:39:19 +0200170static void s3c44b0_serial_putc(const char c)
wdenk074cff02004-02-24 00:16:43 +0000171{
172 /* wait for room in the transmit FIFO */
173 while(!(UTRSTAT0 & 0x02));
174
175 UTXH0 = (unsigned char)c;
176
177 /*
178 to be polite with serial console add a line feed
179 to the carriage return character
180 */
181 if (c=='\n')
182 serial_putc('\r');
183}
184
185/*
186 * Read a single byte from the serial port. Returns 1 on success, 0
187 * otherwise. When the function is succesfull, the character read is
188 * written into its argument c.
189 */
Marek Vasuteb507662012-09-14 22:39:19 +0200190static int s3c44b0_serial_tstc(void)
wdenk074cff02004-02-24 00:16:43 +0000191{
192 return (UTRSTAT0 & 0x01);
193}
194
195/*
196 * Read a single byte from the serial port. Returns 1 on success, 0
197 * otherwise. When the function is succesfull, the character read is
198 * written into its argument c.
199 */
Marek Vasuteb507662012-09-14 22:39:19 +0200200static int s3c44b0_serial_getc(void)
wdenk074cff02004-02-24 00:16:43 +0000201{
202 int rv;
203
204 for(;;) {
Marek Vasuteb507662012-09-14 22:39:19 +0200205 rv = s3c44b0_serial_tstc();
wdenk074cff02004-02-24 00:16:43 +0000206
207 if(rv > 0)
208 return URXH0;
209 }
210}
211
Marek Vasuteb507662012-09-14 22:39:19 +0200212static struct serial_device s3c44b0_serial_drv = {
213 .name = "s3c44b0_serial",
214 .start = s3c44b0_serial_init,
215 .stop = NULL,
216 .setbrg = s3c44b0_serial_setbrg,
217 .putc = s3c44b0_serial_putc,
Marek Vasutec3fd682012-10-06 14:07:02 +0000218 .puts = default_serial_puts,
Marek Vasuteb507662012-09-14 22:39:19 +0200219 .getc = s3c44b0_serial_getc,
220 .tstc = s3c44b0_serial_tstc,
221};
222
223void s3c44b0_serial_initialize(void)
224{
225 serial_register(&s3c44b0_serial_drv);
226}
227
228__weak struct serial_device *default_serial_console(void)
229{
230 return &s3c44b0_serial_drv;
231}