source: SVN/rincon/u-boot/cpu/arm920t/s3c24x0/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

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Signed-off-by: Tim Harvey <tharvey@…>

File size: 6.7 KB
Line 
1/*
2 * (C) Copyright 2002
3 * Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18 *
19 */
20
21#include <common.h>
22#if defined(CONFIG_S3C2400) || defined (CONFIG_S3C2410) || defined (CONFIG_TRAB)
23
24#if defined(CONFIG_S3C2400) || defined(CONFIG_TRAB)
25#include <s3c2400.h>
26#elif defined(CONFIG_S3C2410)
27#include <s3c2410.h>
28#endif
29
30DECLARE_GLOBAL_DATA_PTR;
31
32#ifdef CONFIG_SERIAL1
33#define UART_NR S3C24X0_UART0
34
35#elif defined(CONFIG_SERIAL2)
36# if defined(CONFIG_TRAB)
37#  error "TRAB supports only CONFIG_SERIAL1"
38# endif
39#define UART_NR S3C24X0_UART1
40
41#elif defined(CONFIG_SERIAL3)
42# if defined(CONFIG_TRAB)
43#  #error "TRAB supports only CONFIG_SERIAL1"
44# endif
45#define UART_NR S3C24X0_UART2
46
47#else
48#error "Bad: you didn't configure serial ..."
49#endif
50
51#if defined(CONFIG_SERIAL_MULTI)
52#include <serial.h>
53
54/* Multi serial device functions */
55#define DECLARE_S3C_SERIAL_FUNCTIONS(port) \
56    int  s3serial##port##_init (void) {\
57        return serial_init_dev(port);}\
58    void s3serial##port##_setbrg (void) {\
59        serial_setbrg_dev(port);}\
60    int  s3serial##port##_getc (void) {\
61        return serial_getc_dev(port);}\
62    int  s3serial##port##_tstc (void) {\
63        return serial_tstc_dev(port);}\
64    void s3serial##port##_putc (const char c) {\
65        serial_putc_dev(port, c);}\
66    void s3serial##port##_puts (const char *s) {\
67        serial_puts_dev(port, s);}
68
69#define INIT_S3C_SERIAL_STRUCTURE(port,name,bus) {\
70        name,\
71        bus,\
72        s3serial##port##_init,\
73        s3serial##port##_setbrg,\
74        s3serial##port##_getc,\
75        s3serial##port##_tstc,\
76        s3serial##port##_putc,\
77        s3serial##port##_puts, }
78
79#endif /* CONFIG_SERIAL_MULTI */
80
81void _serial_setbrg(const int dev_index)
82{
83        S3C24X0_UART * const uart = S3C24X0_GetBase_UART(dev_index);
84        unsigned int reg = 0;
85        int i;
86
87        /* value is calculated so : (int)(PCLK/16./baudrate) -1 */
88        reg = get_PCLK() / (16 * gd->baudrate) - 1;
89
90        uart->UBRDIV = reg;
91        for (i = 0; i < 100; i++);
92}
93#if defined(CONFIG_SERIAL_MULTI)
94static inline void
95serial_setbrg_dev(unsigned int dev_index)
96{
97        _serial_setbrg(dev_index);
98}
99#else
100void serial_setbrg(void)
101{
102        _serial_setbrg(UART_NR);
103}
104#endif
105
106
107/* Initialise the serial port. The settings are always 8 data bits, no parity,
108 * 1 stop bit, no start bits.
109 */
110static int serial_init_dev(const int dev_index)
111{
112        S3C24X0_UART * const uart = S3C24X0_GetBase_UART(dev_index);
113
114        /* FIFO enable, Tx/Rx FIFO clear */
115        uart->UFCON = 0x07;
116        uart->UMCON = 0x0;
117
118        /* Normal,No parity,1 stop,8 bit */
119        uart->ULCON = 0x3;
120        /*
121         * tx=level,rx=edge,disable timeout int.,enable rx error int.,
122         * normal,interrupt or polling
123         */
124        uart->UCON = 0x245;
125
126#ifdef CONFIG_HWFLOW
127        uart->UMCON = 0x1; /* RTS up */
128#endif
129
130        /* FIXME: This is sooooooooooooooooooo ugly */
131#if defined(CONFIG_ARCH_GTA02_v1) || defined(CONFIG_ARCH_GTA02_v2)
132        /* we need auto hw flow control on the gsm and gps port */
133        if (dev_index == 0 || dev_index == 1)
134                uart->UMCON = 0x10;
135#endif
136        _serial_setbrg(dev_index);
137
138        return (0);
139}
140
141#if !defined(CONFIG_SERIAL_MULTI)
142/* Initialise the serial port. The settings are always 8 data bits, no parity,
143 * 1 stop bit, no start bits.
144 */
145int serial_init (void)
146{
147        return serial_init_dev(UART_NR);
148}
149#endif
150
151/*
152 * Read a single byte from the serial port. Returns 1 on success, 0
153 * otherwise. When the function is succesfull, the character read is
154 * written into its argument c.
155 */
156int _serial_getc (const int dev_index)
157{
158        S3C24X0_UART * const uart = S3C24X0_GetBase_UART(dev_index);
159
160        /* wait for character to arrive */
161        while (!(uart->UTRSTAT & 0x1));
162
163        return uart->URXH & 0xff;
164}
165#if defined(CONFIG_SERIAL_MULTI)
166static inline int serial_getc_dev(unsigned int dev_index)
167{
168        return _serial_getc(dev_index);
169}
170#else
171int serial_getc (void)
172{
173        return _serial_getc(UART_NR);
174}
175#endif
176
177#ifdef CONFIG_HWFLOW
178static int hwflow = 0; /* turned off by default */
179int hwflow_onoff(int on)
180{
181        switch(on) {
182        case 0:
183        default:
184                break; /* return current */
185        case 1:
186                hwflow = 1; /* turn on */
187                break;
188        case -1:
189                hwflow = 0; /* turn off */
190                break;
191        }
192        return hwflow;
193}
194#endif
195
196#ifdef CONFIG_MODEM_SUPPORT
197static int be_quiet = 0;
198void disable_putc(void)
199{
200        be_quiet = 1;
201}
202
203void enable_putc(void)
204{
205        be_quiet = 0;
206}
207#endif
208
209
210/*
211 * Output a single byte to the serial port.
212 */
213void _serial_putc (const char c, const int dev_index)
214{
215        S3C24X0_UART * const uart = S3C24X0_GetBase_UART(dev_index);
216#ifdef CONFIG_MODEM_SUPPORT
217        if (be_quiet)
218                return;
219#endif
220
221        /* wait for room in the tx FIFO */
222        while (!(uart->UTRSTAT & 0x2));
223
224#ifdef CONFIG_HWFLOW
225        /* Wait for CTS up */
226        while(hwflow && !(uart->UMSTAT & 0x1))
227                ;
228#endif
229
230        uart->UTXH = c;
231
232        /* If \n, also do \r */
233        if (c == '\n')
234                serial_putc ('\r');
235}
236#if defined(CONFIG_SERIAL_MULTI)
237static inline void serial_putc_dev(unsigned int dev_index, const char c)
238{
239        _serial_putc(c, dev_index);
240}
241#else
242void serial_putc(const char c)
243{
244        _serial_putc(c, UART_NR);
245}
246#endif
247
248
249/*
250 * Test whether a character is in the RX buffer
251 */
252int _serial_tstc(const int dev_index)
253{
254        S3C24X0_UART * const uart = S3C24X0_GetBase_UART(dev_index);
255
256        return uart->UTRSTAT & 0x1;
257}
258#if defined(CONFIG_SERIAL_MULTI)
259static inline int
260serial_tstc_dev(unsigned int dev_index)
261{
262        return _serial_tstc(dev_index);
263}
264#else
265int serial_tstc(void)
266{
267        return _serial_tstc(UART_NR);
268}
269#endif
270
271void _serial_puts(const char *s, const int dev_index)
272{
273        while (*s) {
274                _serial_putc (*s++, dev_index);
275        }
276}
277#if defined(CONFIG_SERIAL_MULTI)
278static inline void
279serial_puts_dev(int dev_index, const char *s)
280{
281        _serial_puts(s, dev_index);
282}
283#else
284void
285serial_puts (const char *s)
286{
287        _serial_puts(s, UART_NR);
288}
289#endif
290
291#if defined(CONFIG_SERIAL_MULTI)
292DECLARE_S3C_SERIAL_FUNCTIONS(0);
293struct serial_device s3c24xx_serial0_device =
294        INIT_S3C_SERIAL_STRUCTURE(0, "s3ser0", "S3UART1");
295DECLARE_S3C_SERIAL_FUNCTIONS(1);
296struct serial_device s3c24xx_serial1_device =
297        INIT_S3C_SERIAL_STRUCTURE(1, "s3ser1", "S3UART2");
298DECLARE_S3C_SERIAL_FUNCTIONS(2);
299struct serial_device s3c24xx_serial2_device =
300        INIT_S3C_SERIAL_STRUCTURE(2, "s3ser2", "S3UART3");
301
302#endif /* CONFIG_SERIAL_MULTI */
303
304#endif /* defined(CONFIG_S3C2400) || defined (CONFIG_S3C2410) || defined (CONFIG_TRAB) */
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