weasel_pci.c revision 1.11
1 /* $NetBSD: weasel_pci.c,v 1.11 2008/04/10 19:13:38 cegger 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 1.11 2008/04/10 19:13:38 cegger 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 <sys/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, 95 void *aux) 96 { 97 struct pci_attach_args *pa = aux; 98 99 if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_MIDDLE_DIGITAL && 100 PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_MIDDLE_DIGITAL_WEASEL_CONTROL) 101 return (1); 102 103 return (0); 104 } 105 106 static void 107 weasel_pci_attach(struct device *parent, struct device *self, 108 void *aux) 109 { 110 struct weasel_softc *sc = (void *) self; 111 struct pci_attach_args *pa = aux; 112 struct weasel_config_block cfg; 113 const char *vers, *mode; 114 uint8_t v, *cp; 115 uint16_t cfg_size; 116 uint8_t buf[8]; 117 118 printf(": PCI-Weasel watchdog timer\n"); 119 120 if (pci_mapreg_map(pa, PCI_MAPREG_START, 121 PCI_MAPREG_TYPE_MEM|PCI_MAPREG_MEM_TYPE_32BIT, 0, 122 &sc->sc_st, &sc->sc_sh, NULL, NULL) != 0) { 123 aprint_error_dev(&sc->sc_dev, "unable to map device registers\n"); 124 return; 125 } 126 127 /* Ping the Weasel to see if it's alive. */ 128 if (weasel_issue_command(sc, OS_CMD_PING)) { 129 aprint_error_dev(&sc->sc_dev, "Weasel didn't respond to PING\n"); 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 aprint_error_dev(&sc->sc_dev, "unexpected PING response from Weasel: 0x%02x\n", v); 136 return; 137 } 138 139 /* Read the config block. */ 140 if (weasel_issue_command(sc, OS_CMD_SHOW_CONFIG)) { 141 aprint_error_dev(&sc->sc_dev, "Weasel didn't respond to SHOW_CONFIG\n"); 142 return; 143 } 144 cfg_size = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); 145 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 146 147 if (++cfg_size != sizeof(cfg)) { 148 aprint_error_dev(&sc->sc_dev, "weird config block size from Weasel: 0x%03x\n", cfg_size); 149 return; 150 } 151 152 for (cp = (uint8_t *) &cfg; cfg_size != 0; cfg_size--) { 153 if (weasel_wait_response(sc)) { 154 aprint_error_dev(&sc->sc_dev, "Weasel stopped providing config block(%d)\n", cfg_size); 155 return; 156 } 157 *cp++ = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); 158 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 159 } 160 161 switch (cfg.cfg_version) { 162 case CFG_VERSION_2: 163 vers="2"; 164 switch (cfg.enable_duart_switching) { 165 case 0: 166 mode = "emulation"; 167 break; 168 case 1: 169 mode = "serial"; 170 break; 171 case 2: 172 mode = "autoswitch"; 173 break; 174 default: 175 mode = "unknown"; 176 } 177 break; 178 179 default: 180 vers = mode = NULL; 181 } 182 183 if (vers != NULL) 184 printf("%s: %s mode\n", device_xname(&sc->sc_dev), 185 mode); 186 else 187 printf("%s: unknown config version 0x%02x\n", device_xname(&sc->sc_dev), 188 cfg.cfg_version); 189 190 /* 191 * Fetch sw version. 192 */ 193 if (weasel_issue_command(sc, OS_CMD_QUERY_SW_VER)) { 194 aprint_error_dev(&sc->sc_dev, "didn't reply to software version query.\n"); 195 } 196 else { 197 v = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); 198 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 199 if (v>7) 200 printf("%s: weird length for version string(%d).\n", 201 device_xname(&sc->sc_dev), v); 202 bzero(buf, sizeof(buf)); 203 for (cp = buf; v != 0; v--) { 204 if (weasel_wait_response(sc)) { 205 printf("%s: Weasel stopped providing version\n", 206 device_xname(&sc->sc_dev)); 207 } 208 *cp++ = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); 209 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 210 } 211 printf("%s: sw: %s", device_xname(&sc->sc_dev), buf); 212 } 213 /* 214 * Fetch logic version. 215 */ 216 if (weasel_issue_command(sc, OS_CMD_QUERY_L_VER)) { 217 aprint_normal("\n"); 218 aprint_error_dev(&sc->sc_dev, "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(&sc->sc_dev, "didn't reply to vga bios version query.\n"); 229 } 230 v = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); 231 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 232 printf(" vga bios: %d.%d", (v>>4), (v&0x0f)); 233 /* 234 * Fetch hw version. 235 */ 236 if (weasel_issue_command(sc, OS_CMD_QUERY_HW_VER)) { 237 aprint_normal("\n"); 238 aprint_error_dev(&sc->sc_dev, "didn't reply to hardware version query.\n"); 239 } 240 v = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); 241 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 242 printf(" hw: %d.%d", (v>>4), (v&0x0f)); 243 244 printf("\n%s: break passthrough %s", device_xname(&sc->sc_dev), 245 cfg.break_passthru ? "enabled" : "disabled"); 246 247 if ((sc->sc_wdog_armed = weasel_pci_wdog_query_state(sc)) == -1) 248 sc->sc_wdog_armed = 0; 249 250 /* Weasel is big-endian */ 251 sc->sc_wdog_period = be16toh(cfg.wdt_msec) / 1000; 252 253 printf(", watchdog timer %d sec.\n", sc->sc_wdog_period); 254 sc->sc_smw.smw_name = "weasel"; 255 sc->sc_smw.smw_cookie = sc; 256 sc->sc_smw.smw_setmode = weasel_pci_wdog_setmode; 257 sc->sc_smw.smw_tickle = weasel_pci_wdog_tickle; 258 sc->sc_smw.smw_period = sc->sc_wdog_period; 259 260 if (sysmon_wdog_register(&sc->sc_smw) != 0) 261 aprint_error_dev(&sc->sc_dev, "unable to register PC-Weasel watchdog " 262 "with sysmon\n"); 263 } 264 265 CFATTACH_DECL(weasel_pci, sizeof(struct weasel_softc), 266 weasel_pci_match, weasel_pci_attach, NULL, NULL); 267 268 static int 269 weasel_wait_response(struct weasel_softc *sc) 270 { 271 int i; 272 273 for (i = 10000; i ; i--) { 274 delay(100); 275 if (bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS) == 276 OS_WS_HOST_READ) 277 return(0); 278 } 279 return (1); 280 } 281 282 static int 283 weasel_issue_command(struct weasel_softc *sc, uint8_t cmd) 284 { 285 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_WR, cmd); 286 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_HOST_STATUS, OS_HS_WEASEL_READ); 287 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 288 return (weasel_wait_response(sc)); 289 } 290 291 static int 292 weasel_pci_wdog_setmode(struct sysmon_wdog *smw) 293 { 294 struct weasel_softc *sc = smw->smw_cookie; 295 int error = 0; 296 297 if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) { 298 error = weasel_pci_wdog_disarm(sc); 299 } else { 300 if (smw->smw_period == WDOG_PERIOD_DEFAULT) 301 smw->smw_period = sc->sc_wdog_period; 302 else if (smw->smw_period != sc->sc_wdog_period) { 303 /* Can't change the period on the Weasel. */ 304 return (EINVAL); 305 } 306 error = weasel_pci_wdog_arm(sc); 307 weasel_pci_wdog_tickle(smw); 308 } 309 310 return (error); 311 } 312 313 static int 314 weasel_pci_wdog_tickle(struct sysmon_wdog *smw) 315 { 316 struct weasel_softc *sc = smw->smw_cookie; 317 u_int8_t reg; 318 int x; 319 int s; 320 int error = 0; 321 322 s = splhigh(); 323 /* 324 * first we tickle the watchdog 325 */ 326 reg = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_CHALLENGE); 327 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_RESPONSE, ~reg); 328 329 /* 330 * then we check to make sure the weasel is still armed. If someone 331 * has rebooted the weasel for whatever reason (firmware update), 332 * then the watchdog timer would no longer be armed and we'd be 333 * servicing nothing. Let the user know that the machine is no 334 * longer being monitored by the weasel. 335 */ 336 if((x = weasel_pci_wdog_query_state(sc)) == -1) 337 error = EIO; 338 if (x == 1) { 339 error = 0; 340 } else { 341 printf("%s: Watchdog timer disabled on PC/Weasel! Disarming wdog.\n", 342 device_xname(&sc->sc_dev)); 343 sc->sc_wdog_armed = 0; 344 sysmon_wdog_setmode(smw, WDOG_MODE_DISARMED, 0); 345 error = 1; 346 } 347 splx(s); 348 349 return (error); 350 } 351 352 static int 353 weasel_pci_wdog_arm(struct weasel_softc *sc) 354 { 355 u_int8_t reg; 356 int x; 357 int s; 358 int error = 0; 359 360 s = splhigh(); 361 if (weasel_issue_command(sc, OS_CMD_WDT_ENABLE)) { 362 printf("%s: no reply to watchdog enable. Check Weasel \"Allow Watchdog\" setting.\n", 363 device_xname(&sc->sc_dev)); 364 error = EIO; 365 } 366 reg = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); 367 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 368 369 /* 370 * Ensure that the Weasel thinks it's in the same mode we want it to 371 * be in. EIO if not. 372 */ 373 x = weasel_pci_wdog_query_state(sc); 374 switch (x) { 375 case -1: 376 error = EIO; 377 break; 378 case 0: 379 sc->sc_wdog_armed = 0; 380 error = EIO; 381 break; 382 case 1: 383 sc->sc_wdog_armed = 1; 384 error = 0; 385 break; 386 } 387 388 splx(s); 389 return(error); 390 } 391 392 393 static int 394 weasel_pci_wdog_disarm(struct weasel_softc *sc) 395 { 396 u_int8_t reg; 397 int x; 398 int s; 399 int error = 0; 400 401 s = splhigh(); 402 403 if (weasel_issue_command(sc, OS_CMD_WDT_DISABLE)) { 404 printf("%s: didn't reply to watchdog disable.\n", 405 device_xname(&sc->sc_dev)); 406 error = EIO; 407 } 408 reg = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); 409 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 410 411 /* 412 * Ensure that the Weasel thinks it's in the same mode we want it to 413 * be in. EIO if not. 414 */ 415 x = weasel_pci_wdog_query_state(sc); 416 switch (x) { 417 case -1: 418 error = EIO; 419 break; 420 case 0: 421 sc->sc_wdog_armed = 0; 422 error = 0; 423 break; 424 case 1: 425 sc->sc_wdog_armed = 1; 426 error = EIO; 427 break; 428 } 429 430 splx(s); 431 return(error); 432 } 433 434 static int 435 weasel_pci_wdog_query_state(struct weasel_softc *sc) 436 { 437 438 u_int8_t v; 439 440 if (weasel_issue_command(sc, OS_CMD_WDT_QUERY)) { 441 printf("%s: didn't reply to watchdog state query.\n", 442 device_xname(&sc->sc_dev)); 443 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 444 return(-1); 445 } 446 v = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); 447 bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); 448 return(v); 449 } 450
Indexes created Mon Sep 22 13:09:51 GMT 2025