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> 27__FBSDID("$FreeBSD: stable/11/stand/pc98/libpc98/comconsole.c 260949 2014-01-20 23:27:05Z 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 } 183 184 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 } 201 202 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; 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} 368