1 /* $NetBSD: weasel_pci.c,v 1.16 2016/07/07 06:55:41 msaitoh 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Device driver for the control space on the Middle Digital, Inc. 34 * PCI-Weasel serial console board. 35 * 36 * Since the other functions of the PCI-Weasel already appear in 37 * PCI configuration space, we just need to hook up the watchdog 38 * timer. 39 */ 40 41 #include <sys/cdefs.h> 42 __KERNEL_RCSID(0, "$NetBSD: weasel_pci.c,v 1.16 2016/07/07 06:55:41 msaitoh Exp $"); 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/device.h> 47 #include <sys/wdog.h> 48 #include <sys/endian.h> 49 50 #include <sys/bus.h> 51 52 #include <dev/pci/pcireg.h> 53 #include <dev/pci/pcivar.h> 54 #include <dev/pci/pcidevs.h> 55 56 #include <dev/pci/weaselreg.h> 57 58 #include <dev/sysmon/sysmonvar.h> 59 60 struct weasel_softc { 61 device_t sc_dev; 62 bus_space_tag_t sc_st; 63 bus_space_handle_t sc_sh; 64 65 struct sysmon_wdog sc_smw; 66 67 int sc_wdog_armed; 68 int sc_wdog_period; 69 }; 70 71 /* XXX */ 72 extern int sysmon_wdog_setmode(struct sysmon_wdog *, int, u_int); 73 74 static int weasel_pci_wdog_setmode(struct sysmon_wdog *); 75 static int weasel_pci_wdog_tickle(struct sysmon_wdog *); 76 77 static int weasel_wait_response(struct weasel_softc *); 78 static int weasel_issue_command(struct weasel_softc *, uint8_t cmd); 79 80 static int weasel_pci_wdog_arm(struct weasel_softc *); 81 static int weasel_pci_wdog_disarm(struct weasel_softc *); 82 83 static int weasel_pci_wdog_query_state(struct weasel_softc *); 84 85 static int 86 weasel_pci_match(device_t parent, cfdata_t cf, void *aux) 87 { 88 struct pci_attach_args *pa = aux; 89 90 if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_MIDDLE_DIGITAL && 91 PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_MIDDLE_DIGITAL_WEASEL_CONTROL) 92 return (1); 93 94 return (0); 95 } 96 97 static void 98 weasel_pci_attach(device_t parent, device_t self, void *aux) 99 { 100 struct weasel_softc *sc = device_private(self); 101 struct pci_attach_args *pa = aux; 102 struct weasel_config_block cfg; 103 const char *vers, *mode; 104 uint8_t v, *cp; 105 uint16_t cfg_size; 106 uint8_t buf[8]; 107 108 sc->sc_dev = self; 109 110 printf(": PCI-Weasel watchdog timer\n"); 111 112 if (pci_mapreg_map(pa, PCI_MAPREG_START, 113 PCI_MAPREG_TYPE_MEM|PCI_MAPREG_MEM_TYPE_32BIT, 0, 114 &sc->sc_st, &sc->sc_sh, NULL, NULL) != 0) { 115 aprint_error_dev(self, "unable to map device registers\n"); 116 return; 117 } 118 119 /* Ping the Weasel to see if it's alive. */ 120 if (weasel_issue_command(sc, OS_CMD_PING)) { 121 aprint_error_dev(self, "Weasel didn't respond to PING\n"); 122 return; 123 } 124 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 125 if ((v = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD)) != 126 OS_RET_PONG) { 127 aprint_error_dev(self, 128 "unexpected PING response from Weasel: 0x%02x\n", v); 129 return; 130 } 131 132 /* Read the config block. */ 133 if (weasel_issue_command(sc, OS_CMD_SHOW_CONFIG)) { 134 aprint_error_dev(self, 135 "Weasel didn't respond to SHOW_CONFIG\n"); 136 return; 137 } 138 cfg_size = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); 139 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 140 141 if (++cfg_size != sizeof(cfg)) { 142 aprint_error_dev(self, 143 "weird config block size from Weasel: 0x%03x\n", cfg_size); 144 return; 145 } 146 147 for (cp = (uint8_t *) &cfg; cfg_size != 0; cfg_size--) { 148 if (weasel_wait_response(sc)) { 149 aprint_error_dev(self, 150 "Weasel stopped providing config block(%d)\n", 151 cfg_size); 152 return; 153 } 154 *cp++ = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); 155 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 156 } 157 158 switch (cfg.cfg_version) { 159 case CFG_VERSION_2: 160 vers="2"; 161 switch (cfg.enable_duart_switching) { 162 case 0: 163 mode = "emulation"; 164 break; 165 case 1: 166 mode = "serial"; 167 break; 168 case 2: 169 mode = "autoswitch"; 170 break; 171 default: 172 mode = "unknown"; 173 } 174 break; 175 176 default: 177 vers = mode = NULL; 178 } 179 180 if (vers != NULL) 181 printf("%s: %s mode\n", device_xname(self), mode); 182 else 183 printf("%s: unknown config version 0x%02x\n", 184 device_xname(self), cfg.cfg_version); 185 186 /* 187 * Fetch sw version. 188 */ 189 if (weasel_issue_command(sc, OS_CMD_QUERY_SW_VER)) { 190 aprint_error_dev(self, 191 "didn't reply to software version query.\n"); 192 } 193 else { 194 v = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); 195 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 196 if (v>7) 197 printf("%s: weird length for version string(%d).\n", 198 device_xname(self), v); 199 memset(buf, 0, sizeof(buf)); 200 for (cp = buf; v != 0; v--) { 201 if (weasel_wait_response(sc)) { 202 printf("%s: Weasel stopped providing version\n", 203 device_xname(self)); 204 } 205 *cp++ = bus_space_read_1(sc->sc_st, sc->sc_sh, 206 WEASEL_DATA_RD); 207 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 208 0); 209 } 210 printf("%s: sw: %s", device_xname(self), buf); 211 } 212 /* 213 * Fetch logic version. 214 */ 215 if (weasel_issue_command(sc, OS_CMD_QUERY_L_VER)) { 216 aprint_normal("\n"); 217 aprint_error_dev(self, 218 "didn't reply to logic version query.\n"); 219 } 220 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 221 v = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); 222 printf(" logic: %03d", v); 223 /* 224 * Fetch vga bios version. 225 */ 226 if (weasel_issue_command(sc, OS_CMD_QUERY_VB_VER)) { 227 aprint_normal("\n"); 228 aprint_error_dev(self, 229 "didn't reply to vga bios version query.\n"); 230 } 231 v = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); 232 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 233 printf(" vga bios: %d.%d", (v>>4), (v&0x0f)); 234 /* 235 * Fetch hw version. 236 */ 237 if (weasel_issue_command(sc, OS_CMD_QUERY_HW_VER)) { 238 aprint_normal("\n"); 239 aprint_error_dev(self, 240 "didn't reply to hardware version query.\n"); 241 } 242 v = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); 243 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 244 printf(" hw: %d.%d", (v>>4), (v&0x0f)); 245 246 printf("\n%s: break passthrough %s", device_xname(self), 247 cfg.break_passthru ? "enabled" : "disabled"); 248 249 if ((sc->sc_wdog_armed = weasel_pci_wdog_query_state(sc)) == -1) 250 sc->sc_wdog_armed = 0; 251 252 /* Weasel is big-endian */ 253 sc->sc_wdog_period = be16toh(cfg.wdt_msec) / 1000; 254 255 printf(", watchdog timer %d sec.\n", sc->sc_wdog_period); 256 sc->sc_smw.smw_name = "weasel"; 257 sc->sc_smw.smw_cookie = sc; 258 sc->sc_smw.smw_setmode = weasel_pci_wdog_setmode; 259 sc->sc_smw.smw_tickle = weasel_pci_wdog_tickle; 260 sc->sc_smw.smw_period = sc->sc_wdog_period; 261 262 if (sysmon_wdog_register(&sc->sc_smw) != 0) 263 aprint_error_dev(self, "unable to register PC-Weasel watchdog " 264 "with sysmon\n"); 265 } 266 267 CFATTACH_DECL_NEW(weasel_pci, sizeof(struct weasel_softc), 268 weasel_pci_match, weasel_pci_attach, NULL, NULL); 269 270 static int 271 weasel_wait_response(struct weasel_softc *sc) 272 { 273 int i; 274 275 for (i = 10000; i ; i--) { 276 delay(100); 277 if (bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS) == 278 OS_WS_HOST_READ) 279 return(0); 280 } 281 return (1); 282 } 283 284 static int 285 weasel_issue_command(struct weasel_softc *sc, uint8_t cmd) 286 { 287 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_WR, cmd); 288 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_HOST_STATUS, 289 OS_HS_WEASEL_READ); 290 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 291 return (weasel_wait_response(sc)); 292 } 293 294 static int 295 weasel_pci_wdog_setmode(struct sysmon_wdog *smw) 296 { 297 struct weasel_softc *sc = smw->smw_cookie; 298 int error = 0; 299 300 if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) { 301 error = weasel_pci_wdog_disarm(sc); 302 } else { 303 if (smw->smw_period == WDOG_PERIOD_DEFAULT) 304 smw->smw_period = sc->sc_wdog_period; 305 else if (smw->smw_period != sc->sc_wdog_period) { 306 /* Can't change the period on the Weasel. */ 307 return (EINVAL); 308 } 309 error = weasel_pci_wdog_arm(sc); 310 weasel_pci_wdog_tickle(smw); 311 } 312 313 return (error); 314 } 315 316 static int 317 weasel_pci_wdog_tickle(struct sysmon_wdog *smw) 318 { 319 struct weasel_softc *sc = smw->smw_cookie; 320 u_int8_t reg; 321 int x; 322 int s; 323 int error = 0; 324 325 s = splhigh(); 326 /* 327 * first we tickle the watchdog 328 */ 329 reg = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_CHALLENGE); 330 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_RESPONSE, ~reg); 331 332 /* 333 * then we check to make sure the weasel is still armed. If someone 334 * has rebooted the weasel for whatever reason (firmware update), 335 * then the watchdog timer would no longer be armed and we'd be 336 * servicing nothing. Let the user know that the machine is no 337 * longer being monitored by the weasel. 338 */ 339 if((x = weasel_pci_wdog_query_state(sc)) == -1) 340 error = EIO; 341 if (x == 1) { 342 error = 0; 343 } else { 344 printf("%s: Watchdog timer disabled on PC/Weasel! Disarming wdog.\n", 345 device_xname(sc->sc_dev)); 346 sc->sc_wdog_armed = 0; 347 sysmon_wdog_setmode(smw, WDOG_MODE_DISARMED, 0); 348 error = 1; 349 } 350 splx(s); 351 352 return (error); 353 } 354 355 static int 356 weasel_pci_wdog_arm(struct weasel_softc *sc) 357 { 358 int x; 359 int s; 360 int error = 0; 361 362 s = splhigh(); 363 if (weasel_issue_command(sc, OS_CMD_WDT_ENABLE)) { 364 printf("%s: no reply to watchdog enable. Check Weasel \"Allow Watchdog\" setting.\n", 365 device_xname(sc->sc_dev)); 366 error = EIO; 367 } 368 (void)bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); 369 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 370 371 /* 372 * Ensure that the Weasel thinks it's in the same mode we want it to 373 * be in. EIO if not. 374 */ 375 x = weasel_pci_wdog_query_state(sc); 376 switch (x) { 377 case -1: 378 error = EIO; 379 break; 380 case 0: 381 sc->sc_wdog_armed = 0; 382 error = EIO; 383 break; 384 case 1: 385 sc->sc_wdog_armed = 1; 386 error = 0; 387 break; 388 } 389 390 splx(s); 391 return(error); 392 } 393 394 395 static int 396 weasel_pci_wdog_disarm(struct weasel_softc *sc) 397 { 398 int x; 399 int s; 400 int error = 0; 401 402 s = splhigh(); 403 404 if (weasel_issue_command(sc, OS_CMD_WDT_DISABLE)) { 405 printf("%s: didn't reply to watchdog disable.\n", 406 device_xname(sc->sc_dev)); 407 error = EIO; 408 } 409 (void)bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); 410 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 411 412 /* 413 * Ensure that the Weasel thinks it's in the same mode we want it to 414 * be in. EIO if not. 415 */ 416 x = weasel_pci_wdog_query_state(sc); 417 switch (x) { 418 case -1: 419 error = EIO; 420 break; 421 case 0: 422 sc->sc_wdog_armed = 0; 423 error = 0; 424 break; 425 case 1: 426 sc->sc_wdog_armed = 1; 427 error = EIO; 428 break; 429 } 430 431 splx(s); 432 return(error); 433 } 434 435 static int 436 weasel_pci_wdog_query_state(struct weasel_softc *sc) 437 { 438 439 u_int8_t v; 440 441 if (weasel_issue_command(sc, OS_CMD_WDT_QUERY)) { 442 printf("%s: didn't reply to watchdog state query.\n", 443 device_xname(sc->sc_dev)); 444 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 445 return(-1); 446 } 447 v = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); 448 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 449 return(v); 450 } 451
Indexes created Sat Sep 20 22:09:52 GMT 2025