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39539887 WD |
1 | /* |
2 | * Copyright (c) 2004 Cucy Systems (http://www.cucy.com) | |
3 | * Curt Brune <curt@cucy.com> | |
4 | * | |
5 | * (C) Copyright 2004 | |
6 | * DAVE Srl | |
7 | * http://www.dave-tech.it | |
8 | * http://www.wawnet.biz | |
9 | * mailto:info@wawnet.biz | |
10 | * | |
11 | * (C) Copyright 2002-2004 | |
12 | * Wolfgang Denk, DENX Software Engineering, <wd@denx.de> | |
13 | * | |
14 | * (C) Copyright 2002 | |
15 | * Sysgo Real-Time Solutions, GmbH <www.elinos.com> | |
16 | * Marius Groeger <mgroeger@sysgo.de> | |
17 | * | |
18 | * (C) Copyright 2002 | |
19 | * Sysgo Real-Time Solutions, GmbH <www.elinos.com> | |
20 | * Alex Zuepke <azu@sysgo.de> | |
21 | * | |
22 | * Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl) | |
23 | * | |
24 | * This program is free software; you can redistribute it and/or modify | |
25 | * it under the terms of the GNU General Public License as published by | |
26 | * the Free Software Foundation; either version 2 of the License, or | |
27 | * (at your option) any later version. | |
28 | * | |
29 | * This program is distributed in the hope that it will be useful, | |
30 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
31 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
32 | * GNU General Public License for more details. | |
33 | * | |
34 | * You should have received a copy of the GNU General Public License | |
35 | * along with this program; if not, write to the Free Software | |
36 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
37 | * | |
38 | * MODULE: $Id:$ | |
39 | * Description: UART/Serial interface for Samsung S3C4510B SoC | |
40 | * Runtime Env: ARM7TDMI | |
41 | * Change History: | |
42 | * 03-02-04 Create (Curt Brune) curt@cucy.com | |
43 | * | |
44 | */ | |
45 | ||
46 | #include <common.h> | |
47 | ||
39539887 WD |
48 | #include <asm/hardware.h> |
49 | #include "s3c4510b_uart.h" | |
50 | ||
d87080b7 WD |
51 | DECLARE_GLOBAL_DATA_PTR; |
52 | ||
39539887 WD |
53 | static UART *uart; |
54 | ||
55 | /* flush serial input queue. returns 0 on success or negative error | |
56 | * number otherwise | |
57 | */ | |
58 | static int serial_flush_input(void) | |
59 | { | |
60 | volatile u32 tmp; | |
61 | ||
62 | /* keep on reading as long as the receiver is not empty */ | |
63 | while( uart->m_stat.bf.rxReady) { | |
64 | tmp = uart->m_rx; | |
65 | } | |
66 | ||
67 | return 0; | |
68 | } | |
69 | ||
70 | ||
71 | /* flush output queue. returns 0 on success or negative error number | |
72 | * otherwise | |
73 | */ | |
74 | static int serial_flush_output(void) | |
75 | { | |
76 | /* wait until the transmitter is no longer busy */ | |
77 | while( !uart->m_stat.bf.txBufEmpty); | |
78 | ||
79 | return 0; | |
80 | } | |
81 | ||
82 | ||
83 | void serial_setbrg (void) | |
84 | { | |
39539887 WD |
85 | UART_LINE_CTRL ulctrl; |
86 | UART_CTRL uctrl; | |
87 | UART_BAUD_DIV ubd; | |
88 | ||
89 | serial_flush_output(); | |
90 | serial_flush_input(); | |
91 | ||
92 | /* control register */ | |
93 | uctrl.ui = 0x0; | |
94 | uctrl.bf.rxMode = 0x1; | |
95 | uctrl.bf.rxIrq = 0x0; | |
96 | uctrl.bf.txMode = 0x1; | |
97 | uctrl.bf.DSR = 0x0; | |
98 | uctrl.bf.sendBreak = 0x0; | |
99 | uctrl.bf.loopBack = 0x0; | |
100 | uart->m_ctrl.ui = uctrl.ui; | |
101 | ||
102 | /* line control register */ | |
103 | ulctrl.ui = 0x0; | |
104 | ulctrl.bf.wordLen = 0x3; /* 8 bit data */ | |
105 | ulctrl.bf.nStop = 0x0; /* 1 stop bit */ | |
106 | ulctrl.bf.parity = 0x0; /* no parity */ | |
107 | ulctrl.bf.clk = 0x0; /* internal clock */ | |
108 | ulctrl.bf.infra_red = 0x0; /* no infra_red */ | |
109 | uart->m_lineCtrl.ui = ulctrl.ui; | |
110 | ||
111 | ubd.ui = 0x0; | |
112 | ||
113 | /* see table on page 10-15 in SAMSUNG S3C4510B manual */ | |
114 | /* get correct divisor */ | |
115 | switch(gd->baudrate) { | |
116 | case 1200: ubd.bf.cnt0 = 1301; break; | |
117 | case 2400: ubd.bf.cnt0 = 650; break; | |
118 | case 4800: ubd.bf.cnt0 = 324; break; | |
119 | case 9600: ubd.bf.cnt0 = 162; break; | |
120 | case 19200: ubd.bf.cnt0 = 80; break; | |
121 | case 38400: ubd.bf.cnt0 = 40; break; | |
122 | case 57600: ubd.bf.cnt0 = 26; break; | |
123 | case 115200: ubd.bf.cnt0 = 13; break; | |
124 | } | |
125 | ||
126 | uart->m_baudDiv.ui = ubd.ui; | |
127 | uart->m_baudCnt = 0x0; | |
128 | uart->m_baudClk = 0x0; | |
129 | ||
130 | } | |
131 | ||
132 | ||
133 | /* | |
134 | * Initialise the serial port with the given baudrate. The settings | |
135 | * are always 8 data bits, no parity, 1 stop bit, no start bits. | |
136 | * | |
137 | */ | |
138 | int serial_init (void) | |
139 | { | |
140 | ||
141 | #if CONFIG_SERIAL1 == 1 | |
142 | uart = (UART *)UART0_BASE; | |
143 | #elif CONFIG_SERIAL1 == 2 | |
144 | uart = (UART *)UART1_BASE; | |
145 | #else | |
146 | #error CONFIG_SERIAL1 not equal to 1 or 2 | |
147 | #endif | |
148 | ||
149 | serial_setbrg (); | |
150 | ||
151 | return (0); | |
152 | } | |
153 | ||
154 | ||
155 | /* | |
156 | * Output a single byte to the serial port. | |
157 | */ | |
158 | void serial_putc (const char c) | |
159 | { | |
160 | /* wait for room in the transmit FIFO */ | |
161 | while( !uart->m_stat.bf.txBufEmpty); | |
162 | ||
163 | uart->m_tx = c; | |
164 | ||
165 | /* | |
166 | to be polite with serial console add a line feed | |
167 | to the carriage return character | |
168 | */ | |
169 | if (c=='\n') | |
170 | serial_putc('\r'); | |
171 | } | |
172 | ||
173 | /* | |
174 | * Test if an input byte is ready from the serial port. Returns non-zero on | |
175 | * success, 0 otherwise. | |
176 | */ | |
177 | int serial_tstc (void) | |
178 | { | |
179 | return uart->m_stat.bf.rxReady; | |
180 | } | |
181 | ||
182 | /* | |
183 | * Read a single byte from the serial port. Returns 1 on success, 0 | |
184 | * otherwise. When the function is succesfull, the character read is | |
185 | * written into its argument c. | |
186 | */ | |
187 | int serial_getc (void) | |
188 | { | |
189 | int rv; | |
190 | ||
191 | for(;;) { | |
192 | rv = serial_tstc(); | |
193 | ||
194 | if (rv) { | |
195 | return uart->m_rx & 0xFF; | |
196 | } | |
197 | } | |
198 | } | |
199 | ||
200 | void serial_puts (const char *s) | |
201 | { | |
202 | while (*s) { | |
203 | serial_putc (*s++); | |
204 | } | |
205 | ||
206 | /* busy wait for tx complete */ | |
207 | while ( !uart->m_stat.bf.txComplete); | |
208 | ||
209 | /* clear break */ | |
210 | uart->m_ctrl.bf.sendBreak = 0; | |
211 | ||
212 | } |