1/*-
2 * Copyright (c) 1998 Michael Smith (msmith@freebsd.org)
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26#include <sys/cdefs.h>
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27__FBSDID("$FreeBSD: stable/10/sys/boot/pc98/libpc98/comconsole.c 251223 2013-06-01 12:27:48Z nyan $");
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| 27__FBSDID("$FreeBSD: stable/10/sys/boot/pc98/libpc98/comconsole.c 261573 2014-02-07 04:09:15Z mav $"); |
28
29#include <stand.h>
30#include <bootstrap.h>
31#include <machine/cpufunc.h>
32#include <dev/ic/ns16550.h>
33#include <dev/pci/pcireg.h>
34#include "libi386.h"
35
36#define COMC_FMT 0x3 /* 8N1 */
37#define COMC_TXWAIT 0x40000 /* transmit timeout */
38#define COMC_BPS(x) (115200 / (x)) /* speed to DLAB divisor */
39#define COMC_DIV2BPS(x) (115200 / (x)) /* DLAB divisor to speed */
40
41#ifndef COMPORT
42#define COMPORT 0x238
43#endif
44#ifndef COMSPEED
45#define COMSPEED 9600
46#endif
47
48static void comc_probe(struct console *cp);
49static int comc_init(int arg);
50static void comc_putchar(int c);
51static int comc_getchar(void);
52static int comc_getspeed(void);
53static int comc_ischar(void);
54static int comc_parseint(const char *string);
55static uint32_t comc_parse_pcidev(const char *string);
56static int comc_pcidev_set(struct env_var *ev, int flags,
57 const void *value);
58static int comc_pcidev_handle(uint32_t locator);
59static int comc_port_set(struct env_var *ev, int flags,
60 const void *value);
61static void comc_setup(int speed, int port);
62static int comc_speed_set(struct env_var *ev, int flags,
63 const void *value);
64
65static int comc_curspeed;
66static int comc_port = COMPORT;
67static uint32_t comc_locator;
68
69struct console comconsole = {
70 "comconsole",
71 "serial port",
72 0,
73 comc_probe,
74 comc_init,
75 comc_putchar,
76 comc_getchar,
77 comc_ischar
78};
79
80static void
81comc_probe(struct console *cp)
82{
83 char intbuf[16];
84 char *cons, *env;
85 int speed, port;
86 uint32_t locator;
87
88 if (comc_curspeed == 0) {
89 comc_curspeed = COMSPEED;
90 /*
91 * Assume that the speed was set by an earlier boot loader if
92 * comconsole is already the preferred console.
93 */
94 cons = getenv("console");
95 if ((cons != NULL && strcmp(cons, comconsole.c_name) == 0) ||
96 getenv("boot_multicons") != NULL) {
97 comc_curspeed = comc_getspeed();
98 }
99
100 env = getenv("comconsole_speed");
101 if (env != NULL) {
102 speed = comc_parseint(env);
103 if (speed > 0)
104 comc_curspeed = speed;
105 }
106
107 sprintf(intbuf, "%d", comc_curspeed);
108 unsetenv("comconsole_speed");
109 env_setenv("comconsole_speed", EV_VOLATILE, intbuf, comc_speed_set,
110 env_nounset);
111
112 env = getenv("comconsole_port");
113 if (env != NULL) {
114 port = comc_parseint(env);
115 if (port > 0)
116 comc_port = port;
117 }
118
119 sprintf(intbuf, "%d", comc_port);
120 unsetenv("comconsole_port");
121 env_setenv("comconsole_port", EV_VOLATILE, intbuf, comc_port_set,
122 env_nounset);
123
124 env = getenv("comconsole_pcidev");
125 if (env != NULL) {
126 locator = comc_parse_pcidev(env);
127 if (locator != 0)
128 comc_pcidev_handle(locator);
129 }
130
131 unsetenv("comconsole_pcidev");
132 env_setenv("comconsole_pcidev", EV_VOLATILE, env, comc_pcidev_set,
133 env_nounset);
134 }
135 comc_setup(comc_curspeed, comc_port);
136}
137
138static int
139comc_init(int arg)
140{
141
142 comc_setup(comc_curspeed, comc_port);
143
144 if ((comconsole.c_flags & (C_PRESENTIN | C_PRESENTOUT)) ==
145 (C_PRESENTIN | C_PRESENTOUT))
146 return (CMD_OK);
147 return (CMD_ERROR);
148}
149
150static void
151comc_putchar(int c)
152{
153 int wait;
154
155 for (wait = COMC_TXWAIT; wait > 0; wait--)
156 if (inb(comc_port + com_lsr) & LSR_TXRDY) {
157 outb(comc_port + com_data, (u_char)c);
158 break;
159 }
160}
161
162static int
163comc_getchar(void)
164{
165 return (comc_ischar() ? inb(comc_port + com_data) : -1);
166}
167
168static int
169comc_ischar(void)
170{
171 return (inb(comc_port + com_lsr) & LSR_RXRDY);
172}
173
174static int
175comc_speed_set(struct env_var *ev, int flags, const void *value)
176{
177 int speed;
178
179 if (value == NULL || (speed = comc_parseint(value)) <= 0) {
180 printf("Invalid speed\n");
181 return (CMD_ERROR);
182 }
183
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184 if ((comconsole.c_flags & (C_ACTIVEIN | C_ACTIVEOUT)) != 0 &&
185 comc_curspeed != speed)
|
| 184 if (comc_curspeed != speed) |
185 comc_setup(speed, comc_port);
186
187 env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
188
189 return (CMD_OK);
190}
191
192static int
193comc_port_set(struct env_var *ev, int flags, const void *value)
194{
195 int port;
196
197 if (value == NULL || (port = comc_parseint(value)) <= 0) {
198 printf("Invalid port\n");
199 return (CMD_ERROR);
200 }
201
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203 if ((comconsole.c_flags & (C_ACTIVEIN | C_ACTIVEOUT)) != 0 &&
204 comc_port != port)
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| 202 if (comc_port != port) |
203 comc_setup(comc_curspeed, port);
204
205 env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
206
207 return (CMD_OK);
208}
209
210/*
211 * Input: bus:dev:func[:bar]. If bar is not specified, it is 0x10.
212 * Output: bar[24:16] bus[15:8] dev[7:3] func[2:0]
213 */
214static uint32_t
215comc_parse_pcidev(const char *string)
216{
217 char *p, *p1;
218 uint8_t bus, dev, func, bar;
219 uint32_t locator;
220 int pres;
221
222 pres = strtol(string, &p, 0);
223 if (p == string || *p != ':' || pres < 0 )
224 return (0);
225 bus = pres;
226 p1 = ++p;
227
228 pres = strtol(p1, &p, 0);
229 if (p == string || *p != ':' || pres < 0 )
230 return (0);
231 dev = pres;
232 p1 = ++p;
233
234 pres = strtol(p1, &p, 0);
235 if (p == string || (*p != ':' && *p != '\0') || pres < 0 )
236 return (0);
237 func = pres;
238
239 if (*p == ':') {
240 p1 = ++p;
241 pres = strtol(p1, &p, 0);
242 if (p == string || *p != '\0' || pres <= 0 )
243 return (0);
244 bar = pres;
245 } else
246 bar = 0x10;
247
248 locator = (bar << 16) | biospci_locator(bus, dev, func);
249 return (locator);
250}
251
252static int
253comc_pcidev_handle(uint32_t locator)
254{
255 char intbuf[64];
256 uint32_t port;
257
258 if (biospci_read_config(locator & 0xffff,
259 (locator & 0xff0000) >> 16, 2, &port) == -1) {
260 printf("Cannot read bar at 0x%x\n", locator);
261 return (CMD_ERROR);
262 }
263 if (!PCI_BAR_IO(port)) {
264 printf("Memory bar at 0x%x\n", locator);
265 return (CMD_ERROR);
266 }
267 port &= PCIM_BAR_IO_BASE;
268
269 sprintf(intbuf, "%d", port);
270 unsetenv("comconsole_port");
271 env_setenv("comconsole_port", EV_VOLATILE, intbuf,
272 comc_port_set, env_nounset);
273
274 comc_setup(comc_curspeed, port);
275 comc_locator = locator;
276
277 return (CMD_OK);
278}
279
280static int
281comc_pcidev_set(struct env_var *ev, int flags, const void *value)
282{
283 uint32_t locator;
284 int error;
285
286 if (value == NULL || (locator = comc_parse_pcidev(value)) <= 0) {
287 printf("Invalid pcidev\n");
288 return (CMD_ERROR);
289 }
290 if ((comconsole.c_flags & (C_ACTIVEIN | C_ACTIVEOUT)) != 0 &&
291 comc_locator != locator) {
292 error = comc_pcidev_handle(locator);
293 if (error != CMD_OK)
294 return (error);
295 }
296 env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
297 return (CMD_OK);
298}
299
300static void
301comc_setup(int speed, int port)
302{
303 static int TRY_COUNT = 1000000;
304 char intbuf[64];
305 int tries;
306
307 unsetenv("hw.uart.console");
308 comc_curspeed = speed;
309 comc_port = port;
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310 if ((comconsole.c_flags & (C_ACTIVEIN | C_ACTIVEOUT)) == 0)
311 return; |
312
313 outb(comc_port + com_cfcr, CFCR_DLAB | COMC_FMT);
314 outb(comc_port + com_dlbl, COMC_BPS(speed) & 0xff);
315 outb(comc_port + com_dlbh, COMC_BPS(speed) >> 8);
316 outb(comc_port + com_cfcr, COMC_FMT);
317 outb(comc_port + com_mcr, MCR_RTS | MCR_DTR);
318
319 tries = 0;
320 do
321 inb(comc_port + com_data);
322 while (inb(comc_port + com_lsr) & LSR_RXRDY && ++tries < TRY_COUNT);
323
324 if (tries < TRY_COUNT) {
325 comconsole.c_flags |= (C_PRESENTIN | C_PRESENTOUT);
326 sprintf(intbuf, "io:%d,br:%d", comc_port, comc_curspeed);
327 env_setenv("hw.uart.console", EV_VOLATILE, intbuf, NULL, NULL);
328 } else
329 comconsole.c_flags &= ~(C_PRESENTIN | C_PRESENTOUT);
330}
331
332static int
333comc_parseint(const char *speedstr)
334{
335 char *p;
336 int speed;
337
338 speed = strtol(speedstr, &p, 0);
339 if (p == speedstr || *p != '\0' || speed <= 0)
340 return (-1);
341
342 return (speed);
343}
344
345static int
346comc_getspeed(void)
347{
348 u_int divisor;
349 u_char dlbh;
350 u_char dlbl;
351 u_char cfcr;
352
353 cfcr = inb(comc_port + com_cfcr);
354 outb(comc_port + com_cfcr, CFCR_DLAB | cfcr);
355
356 dlbl = inb(comc_port + com_dlbl);
357 dlbh = inb(comc_port + com_dlbh);
358
359 outb(comc_port + com_cfcr, cfcr);
360
361 divisor = dlbh << 8 | dlbl;
362
363 /* XXX there should be more sanity checking. */
364 if (divisor == 0)
365 return (COMSPEED);
366 return (COMC_DIV2BPS(divisor));
367}
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