weasel_pci.c revision 1.6
1 /* $NetBSD: weasel_pci.c,v 1.6 2005/06/28 00:28:42 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 2001 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Herb Peyerl and Jason Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Device driver for the control space on the Middle Digital, Inc. 41 * PCI-Weasel serial console board. 42 * 43 * Since the other functions of the PCI-Weasel already appear in 44 * PCI configuration space, we just need to hook up the watchdog 45 * timer. 46 */ 47 48 #include <sys/cdefs.h> 49 __KERNEL_RCSID(0, "$NetBSD: weasel_pci.c,v 1.6 2005/06/28 00:28:42 thorpej Exp $"); 50 51 #include <sys/param.h> 52 #include <sys/systm.h> 53 #include <sys/device.h> 54 #include <sys/wdog.h> 55 #include <sys/endian.h> 56 57 #include <machine/bus.h> 58 59 #include <dev/pci/pcireg.h> 60 #include <dev/pci/pcivar.h> 61 #include <dev/pci/pcidevs.h> 62 63 #include <dev/pci/weaselreg.h> 64 65 #include <dev/sysmon/sysmonvar.h> 66 67 struct weasel_softc { 68 struct device sc_dev; /* generic device glue */ 69 70 bus_space_tag_t sc_st; 71 bus_space_handle_t sc_sh; 72 73 struct sysmon_wdog sc_smw; 74 75 int sc_wdog_armed; 76 int sc_wdog_period; 77 }; 78 79 /* XXX */ 80 extern int sysmon_wdog_setmode(struct sysmon_wdog *, int, u_int); 81 82 static int weasel_pci_wdog_setmode(struct sysmon_wdog *); 83 static int weasel_pci_wdog_tickle(struct sysmon_wdog *); 84 85 static int weasel_wait_response(struct weasel_softc *); 86 static int weasel_issue_command(struct weasel_softc *, uint8_t cmd); 87 88 static int weasel_pci_wdog_arm(struct weasel_softc *); 89 static int weasel_pci_wdog_disarm(struct weasel_softc *); 90 91 static int weasel_pci_wdog_query_state(struct weasel_softc *); 92 93 static int 94 weasel_pci_match(struct device *parent, struct cfdata *cf, void *aux) 95 { 96 struct pci_attach_args *pa = aux; 97 98 if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_MIDDLE_DIGITAL && 99 PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_MIDDLE_DIGITAL_WEASEL_CONTROL) 100 return (1); 101 102 return (0); 103 } 104 105 static void 106 weasel_pci_attach(struct device *parent, struct device *self, void *aux) 107 { 108 struct weasel_softc *sc = (void *) self; 109 struct pci_attach_args *pa = aux; 110 struct weasel_config_block cfg; 111 const char *vers, *mode; 112 uint8_t v, *cp; 113 uint16_t cfg_size; 114 uint8_t buf[8]; 115 116 printf(": PCI-Weasel watchdog timer\n"); 117 118 if (pci_mapreg_map(pa, PCI_MAPREG_START, 119 PCI_MAPREG_TYPE_MEM|PCI_MAPREG_MEM_TYPE_32BIT, 0, 120 &sc->sc_st, &sc->sc_sh, NULL, NULL) != 0) { 121 printf("%s: unable to map device registers\n", 122 sc->sc_dev.dv_xname); 123 return; 124 } 125 126 /* Ping the Weasel to see if it's alive. */ 127 if (weasel_issue_command(sc, OS_CMD_PING)) { 128 printf("%s: Weasel didn't respond to PING\n", 129 sc->sc_dev.dv_xname); 130 return; 131 } 132 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 133 if ((v = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD)) != 134 OS_RET_PONG) { 135 printf("%s: unexpected PING response from Weasel: 0x%02x\n", 136 sc->sc_dev.dv_xname, v); 137 return; 138 } 139 140 /* Read the config block. */ 141 if (weasel_issue_command(sc, OS_CMD_SHOW_CONFIG)) { 142 printf("%s: Weasel didn't respond to SHOW_CONFIG\n", 143 sc->sc_dev.dv_xname); 144 return; 145 } 146 cfg_size = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); 147 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 148 149 if (++cfg_size != sizeof(cfg)) { 150 printf("%s: weird config block size from Weasel: 0x%03x\n", 151 sc->sc_dev.dv_xname, cfg_size); 152 return; 153 } 154 155 for (cp = (uint8_t *) &cfg; cfg_size != 0; cfg_size--) { 156 if (weasel_wait_response(sc)) { 157 printf("%s: Weasel stopped providing config block(%d)\n", 158 sc->sc_dev.dv_xname, cfg_size); 159 return; 160 } 161 *cp++ = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); 162 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 163 } 164 165 switch (cfg.cfg_version) { 166 case CFG_VERSION_2: 167 vers="2"; 168 switch (cfg.enable_duart_switching) { 169 case 0: 170 mode = "emulation"; 171 break; 172 case 1: 173 mode = "serial"; 174 break; 175 case 2: 176 mode = "autoswitch"; 177 break; 178 default: 179 mode = "unknown"; 180 } 181 break; 182 183 default: 184 vers = mode = NULL; 185 } 186 187 if (vers != NULL) 188 printf("%s: %s mode\n", sc->sc_dev.dv_xname, 189 mode); 190 else 191 printf("%s: unknown config version 0x%02x\n", sc->sc_dev.dv_xname, 192 cfg.cfg_version); 193 194 /* 195 * Fetch sw version. 196 */ 197 if (weasel_issue_command(sc, OS_CMD_QUERY_SW_VER)) { 198 printf("%s: didn't reply to software version query.\n", 199 sc->sc_dev.dv_xname); 200 } 201 else { 202 v = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); 203 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 204 if (v>7) 205 printf("%s: weird length for version string(%d).\n", 206 sc->sc_dev.dv_xname, v); 207 bzero(buf, sizeof(buf)); 208 for (cp = buf; v != 0; v--) { 209 if (weasel_wait_response(sc)) { 210 printf("%s: Weasel stopped providing version\n", 211 sc->sc_dev.dv_xname); 212 } 213 *cp++ = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); 214 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 215 } 216 printf("%s: sw: %s", sc->sc_dev.dv_xname, buf); 217 } 218 /* 219 * Fetch logic version. 220 */ 221 if (weasel_issue_command(sc, OS_CMD_QUERY_L_VER)) { 222 printf("\n%s: didn't reply to logic version query.\n", 223 sc->sc_dev.dv_xname); 224 } 225 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 226 v = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); 227 printf(" logic: %03d", v); 228 /* 229 * Fetch vga bios version. 230 */ 231 if (weasel_issue_command(sc, OS_CMD_QUERY_VB_VER)) { 232 printf("\n%s: didn't reply to vga bios version query.\n", 233 sc->sc_dev.dv_xname); 234 } 235 v = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); 236 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 237 printf(" vga bios: %d.%d", (v>>4), (v&0x0f)); 238 /* 239 * Fetch hw version. 240 */ 241 if (weasel_issue_command(sc, OS_CMD_QUERY_HW_VER)) { 242 printf("\n%s: didn't reply to hardware version query.\n", 243 sc->sc_dev.dv_xname); 244 } 245 v = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); 246 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 247 printf(" hw: %d.%d", (v>>4), (v&0x0f)); 248 249 printf("\n%s: break passthrough %s", sc->sc_dev.dv_xname, 250 cfg.break_passthru ? "enabled" : "disabled"); 251 252 if ((sc->sc_wdog_armed = weasel_pci_wdog_query_state(sc)) == -1) 253 sc->sc_wdog_armed = 0; 254 255 /* Weasel is big-endian */ 256 sc->sc_wdog_period = be16toh(cfg.wdt_msec) / 1000; 257 258 printf(", watchdog timer %d sec.\n", sc->sc_wdog_period); 259 sc->sc_smw.smw_name = "weasel"; 260 sc->sc_smw.smw_cookie = sc; 261 sc->sc_smw.smw_setmode = weasel_pci_wdog_setmode; 262 sc->sc_smw.smw_tickle = weasel_pci_wdog_tickle; 263 sc->sc_smw.smw_period = sc->sc_wdog_period; 264 265 if (sysmon_wdog_register(&sc->sc_smw) != 0) 266 printf("%s: unable to register PC-Weasel watchdog " 267 "with sysmon\n", sc->sc_dev.dv_xname); 268 } 269 270 CFATTACH_DECL(weasel_pci, sizeof(struct weasel_softc), 271 weasel_pci_match, weasel_pci_attach, NULL, NULL); 272 273 static int 274 weasel_wait_response(struct weasel_softc *sc) 275 { 276 int i; 277 278 for (i = 10000; i ; i--) { 279 delay(100); 280 if (bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS) == 281 OS_WS_HOST_READ) 282 return(0); 283 } 284 return (1); 285 } 286 287 static int 288 weasel_issue_command(struct weasel_softc *sc, uint8_t cmd) 289 { 290 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_WR, cmd); 291 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_HOST_STATUS, OS_HS_WEASEL_READ); 292 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 293 return (weasel_wait_response(sc)); 294 } 295 296 static int 297 weasel_pci_wdog_setmode(struct sysmon_wdog *smw) 298 { 299 struct weasel_softc *sc = smw->smw_cookie; 300 int error = 0; 301 302 if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) { 303 error = weasel_pci_wdog_disarm(sc); 304 } else { 305 if (smw->smw_period == WDOG_PERIOD_DEFAULT) 306 smw->smw_period = sc->sc_wdog_period; 307 else if (smw->smw_period != sc->sc_wdog_period) { 308 /* Can't change the period on the Weasel. */ 309 return (EINVAL); 310 } 311 error = weasel_pci_wdog_arm(sc); 312 weasel_pci_wdog_tickle(smw); 313 } 314 315 return (error); 316 } 317 318 static int 319 weasel_pci_wdog_tickle(struct sysmon_wdog *smw) 320 { 321 struct weasel_softc *sc = smw->smw_cookie; 322 u_int8_t reg; 323 int x; 324 int s; 325 int error = 0; 326 327 s = splhigh(); 328 /* 329 * first we tickle the watchdog 330 */ 331 reg = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_CHALLENGE); 332 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_RESPONSE, ~reg); 333 334 /* 335 * then we check to make sure the weasel is still armed. If someone 336 * has rebooted the weasel for whatever reason (firmware update), 337 * then the watchdog timer would no longer be armed and we'd be 338 * servicing nothing. Let the user know that the machine is no 339 * longer being monitored by the weasel. 340 */ 341 if((x = weasel_pci_wdog_query_state(sc)) == -1) 342 error = EIO; 343 if (x == 1) { 344 error = 0; 345 } else { 346 printf("%s: Watchdog timer disabled on PC/Weasel! Disarming wdog.\n", 347 sc->sc_dev.dv_xname); 348 sc->sc_wdog_armed = 0; 349 sysmon_wdog_setmode(smw, WDOG_MODE_DISARMED, 0); 350 error = 1; 351 } 352 splx(s); 353 354 return (error); 355 } 356 357 static int 358 weasel_pci_wdog_arm(struct weasel_softc *sc) 359 { 360 u_int8_t reg; 361 int x; 362 int s; 363 int error = 0; 364 365 s = splhigh(); 366 if (weasel_issue_command(sc, OS_CMD_WDT_ENABLE)) { 367 printf("%s: no reply to watchdog enable. Check Weasel \"Allow Watchdog\" setting.\n", 368 sc->sc_dev.dv_xname); 369 error = EIO; 370 } 371 reg = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); 372 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 373 374 /* 375 * Ensure that the Weasel thinks it's in the same mode we want it to 376 * be in. EIO if not. 377 */ 378 x = weasel_pci_wdog_query_state(sc); 379 switch (x) { 380 case -1: 381 error = EIO; 382 break; 383 case 0: 384 sc->sc_wdog_armed = 0; 385 error = EIO; 386 break; 387 case 1: 388 sc->sc_wdog_armed = 1; 389 error = 0; 390 break; 391 } 392 393 splx(s); 394 return(error); 395 } 396 397 398 static int 399 weasel_pci_wdog_disarm(struct weasel_softc *sc) 400 { 401 u_int8_t reg; 402 int x; 403 int s; 404 int error = 0; 405 406 s = splhigh(); 407 408 if (weasel_issue_command(sc, OS_CMD_WDT_DISABLE)) { 409 printf("%s: didn't reply to watchdog disable.\n", 410 sc->sc_dev.dv_xname); 411 error = EIO; 412 } 413 reg = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); 414 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 415 416 /* 417 * Ensure that the Weasel thinks it's in the same mode we want it to 418 * be in. EIO if not. 419 */ 420 x = weasel_pci_wdog_query_state(sc); 421 switch (x) { 422 case -1: 423 error = EIO; 424 break; 425 case 0: 426 sc->sc_wdog_armed = 0; 427 error = 0; 428 break; 429 case 1: 430 sc->sc_wdog_armed = 1; 431 error = EIO; 432 break; 433 } 434 435 splx(s); 436 return(error); 437 } 438 439 static int 440 weasel_pci_wdog_query_state(struct weasel_softc *sc) 441 { 442 443 u_int8_t v; 444 445 if (weasel_issue_command(sc, OS_CMD_WDT_QUERY)) { 446 printf("%s: didn't reply to watchdog state query.\n", 447 sc->sc_dev.dv_xname); 448 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 449 return(-1); 450 } 451 v = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); 452 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 453 return(v); 454 } 455
Indexes created Tue Sep 23 23:09:58 GMT 2025