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1 /*
2  * (C) Copyright 2004
3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4  *
5  * See file CREDITS for list of people who contributed to this
6  * project.
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License as
10  * published by the Free Software Foundation; either version 2 of
11  * the License, or (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21  * MA 02111-1307 USA
22  */
23
24 #include <common.h>
25 #include <serial.h>
26 #include <stdio_dev.h>
27 #include <post.h>
28 #include <linux/compiler.h>
29
30 DECLARE_GLOBAL_DATA_PTR;
31
32 static struct serial_device *serial_devices;
33 static struct serial_device *serial_current;
34
35 void serial_register(struct serial_device *dev)
36 {
37 #ifdef CONFIG_NEEDS_MANUAL_RELOC
38         dev->init += gd->reloc_off;
39         dev->setbrg += gd->reloc_off;
40         dev->getc += gd->reloc_off;
41         dev->tstc += gd->reloc_off;
42         dev->putc += gd->reloc_off;
43         dev->puts += gd->reloc_off;
44 #endif
45
46         dev->next = serial_devices;
47         serial_devices = dev;
48 }
49
50 void serial_initialize(void)
51 {
52 #if defined(CONFIG_8xx_CONS_SMC1) || defined(CONFIG_8xx_CONS_SMC2)
53         serial_register(&serial_smc_device);
54 #endif
55 #if     defined(CONFIG_8xx_CONS_SCC1) || defined(CONFIG_8xx_CONS_SCC2) || \
56         defined(CONFIG_8xx_CONS_SCC3) || defined(CONFIG_8xx_CONS_SCC4)
57         serial_register(&serial_scc_device);
58 #endif
59
60 #if defined(CONFIG_SYS_NS16550_SERIAL)
61 #if defined(CONFIG_SYS_NS16550_COM1)
62         serial_register(&eserial1_device);
63 #endif
64 #if defined(CONFIG_SYS_NS16550_COM2)
65         serial_register(&eserial2_device);
66 #endif
67 #if defined(CONFIG_SYS_NS16550_COM3)
68         serial_register(&eserial3_device);
69 #endif
70 #if defined(CONFIG_SYS_NS16550_COM4)
71         serial_register(&eserial4_device);
72 #endif
73 #endif /* CONFIG_SYS_NS16550_SERIAL */
74 #if defined(CONFIG_FFUART)
75         serial_register(&serial_ffuart_device);
76 #endif
77 #if defined(CONFIG_BTUART)
78         serial_register(&serial_btuart_device);
79 #endif
80 #if defined(CONFIG_STUART)
81         serial_register(&serial_stuart_device);
82 #endif
83 #if defined(CONFIG_S3C2410)
84         serial_register(&s3c24xx_serial0_device);
85         serial_register(&s3c24xx_serial1_device);
86         serial_register(&s3c24xx_serial2_device);
87 #endif
88 #if defined(CONFIG_S5P)
89         serial_register(&s5p_serial0_device);
90         serial_register(&s5p_serial1_device);
91         serial_register(&s5p_serial2_device);
92         serial_register(&s5p_serial3_device);
93 #endif
94 #if defined(CONFIG_MPC512X)
95 #if defined(CONFIG_SYS_PSC1)
96         serial_register(&serial1_device);
97 #endif
98 #if defined(CONFIG_SYS_PSC3)
99         serial_register(&serial3_device);
100 #endif
101 #if defined(CONFIG_SYS_PSC4)
102         serial_register(&serial4_device);
103 #endif
104 #if defined(CONFIG_SYS_PSC6)
105         serial_register(&serial6_device);
106 #endif
107 #endif
108 #if defined(CONFIG_SYS_BFIN_UART)
109         serial_register_bfin_uart();
110 #endif
111 #if defined(CONFIG_XILINX_UARTLITE)
112 # ifdef XILINX_UARTLITE_BASEADDR
113         serial_register(&uartlite_serial0_device);
114 # endif /* XILINX_UARTLITE_BASEADDR */
115 # ifdef XILINX_UARTLITE_BASEADDR1
116         serial_register(&uartlite_serial1_device);
117 # endif /* XILINX_UARTLITE_BASEADDR1 */
118 # ifdef XILINX_UARTLITE_BASEADDR2
119         serial_register(&uartlite_serial2_device);
120 # endif /* XILINX_UARTLITE_BASEADDR2 */
121 # ifdef XILINX_UARTLITE_BASEADDR3
122         serial_register(&uartlite_serial3_device);
123 # endif /* XILINX_UARTLITE_BASEADDR3 */
124 #endif /* CONFIG_XILINX_UARTLITE */
125         serial_assign(default_serial_console()->name);
126 }
127
128 void serial_stdio_init(void)
129 {
130         struct stdio_dev dev;
131         struct serial_device *s = serial_devices;
132
133         while (s) {
134                 memset(&dev, 0, sizeof(dev));
135
136                 strcpy(dev.name, s->name);
137                 dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT;
138
139                 dev.start = s->init;
140                 dev.stop = s->uninit;
141                 dev.putc = s->putc;
142                 dev.puts = s->puts;
143                 dev.getc = s->getc;
144                 dev.tstc = s->tstc;
145
146                 stdio_register(&dev);
147
148                 s = s->next;
149         }
150 }
151
152 int serial_assign(const char *name)
153 {
154         struct serial_device *s;
155
156         for (s = serial_devices; s; s = s->next) {
157                 if (strcmp(s->name, name) == 0) {
158                         serial_current = s;
159                         return 0;
160                 }
161         }
162
163         return 1;
164 }
165
166 void serial_reinit_all(void)
167 {
168         struct serial_device *s;
169
170         for (s = serial_devices; s; s = s->next)
171                 s->init();
172 }
173
174 static struct serial_device *get_current(void)
175 {
176         struct serial_device *dev;
177
178         if (!(gd->flags & GD_FLG_RELOC) || !serial_current) {
179                 dev = default_serial_console();
180
181                 /* We must have a console device */
182                 if (!dev)
183                         panic("Cannot find console");
184         } else
185                 dev = serial_current;
186         return dev;
187 }
188
189 int serial_init(void)
190 {
191         return get_current()->init();
192 }
193
194 void serial_setbrg(void)
195 {
196         get_current()->setbrg();
197 }
198
199 int serial_getc(void)
200 {
201         return get_current()->getc();
202 }
203
204 int serial_tstc(void)
205 {
206         return get_current()->tstc();
207 }
208
209 void serial_putc(const char c)
210 {
211         get_current()->putc(c);
212 }
213
214 void serial_puts(const char *s)
215 {
216         get_current()->puts(s);
217 }
218
219 #if CONFIG_POST & CONFIG_SYS_POST_UART
220 static const int bauds[] = CONFIG_SYS_BAUDRATE_TABLE;
221
222 /* Mark weak until post/cpu/.../uart.c migrate over */
223 __weak
224 int uart_post_test(int flags)
225 {
226         unsigned char c;
227         int ret, saved_baud, b;
228         struct serial_device *saved_dev, *s;
229         bd_t *bd = gd->bd;
230
231         /* Save current serial state */
232         ret = 0;
233         saved_dev = serial_current;
234         saved_baud = bd->bi_baudrate;
235
236         for (s = serial_devices; s; s = s->next) {
237                 /* If this driver doesn't support loop back, skip it */
238                 if (!s->loop)
239                         continue;
240
241                 /* Test the next device */
242                 serial_current = s;
243
244                 ret = serial_init();
245                 if (ret)
246                         goto done;
247
248                 /* Consume anything that happens to be queued */
249                 while (serial_tstc())
250                         serial_getc();
251
252                 /* Enable loop back */
253                 s->loop(1);
254
255                 /* Test every available baud rate */
256                 for (b = 0; b < ARRAY_SIZE(bauds); ++b) {
257                         bd->bi_baudrate = bauds[b];
258                         serial_setbrg();
259
260                         /*
261                          * Stick to printable chars to avoid issues:
262                          *  - terminal corruption
263                          *  - serial program reacting to sequences and sending
264                          *    back random extra data
265                          *  - most serial drivers add in extra chars (like \r\n)
266                          */
267                         for (c = 0x20; c < 0x7f; ++c) {
268                                 /* Send it out */
269                                 serial_putc(c);
270
271                                 /* Make sure it's the same one */
272                                 ret = (c != serial_getc());
273                                 if (ret) {
274                                         s->loop(0);
275                                         goto done;
276                                 }
277
278                                 /* Clean up the output in case it was sent */
279                                 serial_putc('\b');
280                                 ret = ('\b' != serial_getc());
281                                 if (ret) {
282                                         s->loop(0);
283                                         goto done;
284                                 }
285                         }
286                 }
287
288                 /* Disable loop back */
289                 s->loop(0);
290
291                 /* XXX: There is no serial_uninit() !? */
292                 if (s->uninit)
293                         s->uninit();
294         }
295
296  done:
297         /* Restore previous serial state */
298         serial_current = saved_dev;
299         bd->bi_baudrate = saved_baud;
300         serial_reinit_all();
301         serial_setbrg();
302
303         return ret;
304 }
305 #endif