piixpm.c revision 1.17.2.1
1 /* $NetBSD: piixpm.c,v 1.17.2.1 2008/02/18 21:05:58 mjf Exp $ */ 2 /* $OpenBSD: piixpm.c,v 1.20 2006/02/27 08:25:02 grange Exp $ */ 3 4 /* 5 * Copyright (c) 2005, 2006 Alexander Yurchenko <grange (at) openbsd.org> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 /* 21 * Intel PIIX and compatible Power Management controller driver. 22 */ 23 24 #include <sys/cdefs.h> 25 __KERNEL_RCSID(0, "$NetBSD: piixpm.c,v 1.17.2.1 2008/02/18 21:05:58 mjf Exp $"); 26 27 #include <sys/param.h> 28 #include <sys/systm.h> 29 #include <sys/device.h> 30 #include <sys/kernel.h> 31 #include <sys/rwlock.h> 32 #include <sys/proc.h> 33 34 #include <sys/bus.h> 35 36 #include <dev/pci/pcidevs.h> 37 #include <dev/pci/pcireg.h> 38 #include <dev/pci/pcivar.h> 39 40 #include <dev/pci/piixpmreg.h> 41 42 #include <dev/i2c/i2cvar.h> 43 44 #include <dev/ic/acpipmtimer.h> 45 46 #ifdef PIIXPM_DEBUG 47 #define DPRINTF(x) printf x 48 #else 49 #define DPRINTF(x) 50 #endif 51 52 #define PIIXPM_DELAY 200 53 #define PIIXPM_TIMEOUT 1 54 55 struct piixpm_softc { 56 struct device sc_dev; 57 58 bus_space_tag_t sc_smb_iot; 59 bus_space_handle_t sc_smb_ioh; 60 void * sc_smb_ih; 61 int sc_poll; 62 63 bus_space_tag_t sc_pm_iot; 64 bus_space_handle_t sc_pm_ioh; 65 66 pci_chipset_tag_t sc_pc; 67 pcitag_t sc_pcitag; 68 69 struct i2c_controller sc_i2c_tag; 70 krwlock_t sc_i2c_rwlock; 71 struct { 72 i2c_op_t op; 73 void * buf; 74 size_t len; 75 int flags; 76 volatile int error; 77 } sc_i2c_xfer; 78 79 void * sc_powerhook; 80 struct pci_conf_state sc_pciconf; 81 pcireg_t sc_devact[2]; 82 }; 83 84 int piixpm_match(struct device *, struct cfdata *, void *); 85 void piixpm_attach(struct device *, struct device *, void *); 86 87 void piixpm_powerhook(int, void *); 88 89 int piixpm_i2c_acquire_bus(void *, int); 90 void piixpm_i2c_release_bus(void *, int); 91 int piixpm_i2c_exec(void *, i2c_op_t, i2c_addr_t, const void *, size_t, 92 void *, size_t, int); 93 94 int piixpm_intr(void *); 95 96 CFATTACH_DECL(piixpm, sizeof(struct piixpm_softc), 97 piixpm_match, piixpm_attach, NULL, NULL); 98 99 int 100 piixpm_match(struct device *parent, struct cfdata *match, 101 void *aux) 102 { 103 struct pci_attach_args *pa; 104 105 pa = (struct pci_attach_args *)aux; 106 switch (PCI_VENDOR(pa->pa_id)) { 107 case PCI_VENDOR_INTEL: 108 switch (PCI_PRODUCT(pa->pa_id)) { 109 case PCI_PRODUCT_INTEL_82371AB_PMC: 110 case PCI_PRODUCT_INTEL_82440MX_PMC: 111 return 1; 112 } 113 break; 114 case PCI_VENDOR_ATI: 115 switch (PCI_PRODUCT(pa->pa_id)) { 116 case PCI_PRODUCT_ATI_SB200_SMB: 117 case PCI_PRODUCT_ATI_SB300_SMB: 118 case PCI_PRODUCT_ATI_SB400_SMB: 119 return 1; 120 } 121 break; 122 case PCI_VENDOR_SERVERWORKS: 123 switch (PCI_PRODUCT(pa->pa_id)) { 124 case PCI_PRODUCT_SERVERWORKS_OSB4: 125 case PCI_PRODUCT_SERVERWORKS_CSB5: 126 case PCI_PRODUCT_SERVERWORKS_CSB6: 127 case PCI_PRODUCT_SERVERWORKS_HT1000SB: 128 return 1; 129 } 130 } 131 132 return 0; 133 } 134 135 void 136 piixpm_attach(struct device *parent, struct device *self, void *aux) 137 { 138 struct piixpm_softc *sc = (struct piixpm_softc *)self; 139 struct pci_attach_args *pa = aux; 140 struct i2cbus_attach_args iba; 141 pcireg_t base, conf; 142 pcireg_t pmmisc; 143 pci_intr_handle_t ih; 144 char devinfo[256]; 145 const char *intrstr = NULL; 146 147 sc->sc_pc = pa->pa_pc; 148 sc->sc_pcitag = pa->pa_tag; 149 150 aprint_naive("\n"); 151 152 pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo, sizeof(devinfo)); 153 aprint_normal("\n%s: %s (rev. 0x%02x)", 154 device_xname(self), devinfo, PCI_REVISION(pa->pa_class)); 155 156 sc->sc_powerhook = powerhook_establish(sc->sc_dev.dv_xname, 157 piixpm_powerhook, sc); 158 if (sc->sc_powerhook == NULL) 159 aprint_error("%s: can't establish powerhook\n", 160 sc->sc_dev.dv_xname); 161 162 /* Read configuration */ 163 conf = pci_conf_read(pa->pa_pc, pa->pa_tag, PIIX_SMB_HOSTC); 164 DPRINTF((": conf 0x%x", conf)); 165 166 if ((PCI_VENDOR(pa->pa_id) != PCI_VENDOR_INTEL) || 167 (PCI_PRODUCT(pa->pa_id) != PCI_PRODUCT_INTEL_82371AB_PMC)) 168 goto nopowermanagement; 169 170 /* check whether I/O access to PM regs is enabled */ 171 pmmisc = pci_conf_read(pa->pa_pc, pa->pa_tag, PIIX_PMREGMISC); 172 if (!(pmmisc & 1)) 173 goto nopowermanagement; 174 175 sc->sc_pm_iot = pa->pa_iot; 176 /* Map I/O space */ 177 base = pci_conf_read(pa->pa_pc, pa->pa_tag, PIIX_PM_BASE); 178 if (bus_space_map(sc->sc_pm_iot, PCI_MAPREG_IO_ADDR(base), 179 PIIX_PM_SIZE, 0, &sc->sc_pm_ioh)) { 180 aprint_error("%s: can't map power management I/O space\n", 181 sc->sc_dev.dv_xname); 182 goto nopowermanagement; 183 } 184 185 /* 186 * Revision 0 and 1 are PIIX4, 2 is PIIX4E, 3 is PIIX4M. 187 * PIIX4 and PIIX4E have a bug in the timer latch, see Errata #20 188 * in the "Specification update" (document #297738). 189 */ 190 acpipmtimer_attach(&sc->sc_dev, sc->sc_pm_iot, sc->sc_pm_ioh, 191 PIIX_PM_PMTMR, 192 (PCI_REVISION(pa->pa_class) < 3) ? ACPIPMT_BADLATCH : 0 ); 193 194 nopowermanagement: 195 if ((conf & PIIX_SMB_HOSTC_HSTEN) == 0) { 196 aprint_normal("%s: SMBus disabled\n", sc->sc_dev.dv_xname); 197 return; 198 } 199 200 /* Map I/O space */ 201 sc->sc_smb_iot = pa->pa_iot; 202 base = pci_conf_read(pa->pa_pc, pa->pa_tag, PIIX_SMB_BASE) & 0xffff; 203 if (bus_space_map(sc->sc_smb_iot, PCI_MAPREG_IO_ADDR(base), 204 PIIX_SMB_SIZE, 0, &sc->sc_smb_ioh)) { 205 aprint_error("%s: can't map smbus I/O space\n", 206 sc->sc_dev.dv_xname); 207 return; 208 } 209 210 sc->sc_poll = 1; 211 if ((conf & PIIX_SMB_HOSTC_INTMASK) == PIIX_SMB_HOSTC_SMI) { 212 /* No PCI IRQ */ 213 aprint_normal("%s: interrupting at SMI", sc->sc_dev.dv_xname); 214 } else if ((conf & PIIX_SMB_HOSTC_INTMASK) == PIIX_SMB_HOSTC_IRQ) { 215 /* Install interrupt handler */ 216 if (pci_intr_map(pa, &ih) == 0) { 217 intrstr = pci_intr_string(pa->pa_pc, ih); 218 sc->sc_smb_ih = pci_intr_establish(pa->pa_pc, ih, IPL_BIO, 219 piixpm_intr, sc); 220 if (sc->sc_smb_ih != NULL) { 221 aprint_normal("%s: interrupting at %s", 222 sc->sc_dev.dv_xname, intrstr); 223 sc->sc_poll = 0; 224 } 225 } 226 if (sc->sc_poll) 227 aprint_normal("%s: polling", sc->sc_dev.dv_xname); 228 } 229 230 aprint_normal("\n"); 231 232 /* Attach I2C bus */ 233 rw_init(&sc->sc_i2c_rwlock); 234 sc->sc_i2c_tag.ic_cookie = sc; 235 sc->sc_i2c_tag.ic_acquire_bus = piixpm_i2c_acquire_bus; 236 sc->sc_i2c_tag.ic_release_bus = piixpm_i2c_release_bus; 237 sc->sc_i2c_tag.ic_exec = piixpm_i2c_exec; 238 239 bzero(&iba, sizeof(iba)); 240 iba.iba_tag = &sc->sc_i2c_tag; 241 config_found_ia(self, "i2cbus", &iba, iicbus_print); 242 243 return; 244 } 245 246 void 247 piixpm_powerhook(int why, void *cookie) 248 { 249 struct piixpm_softc *sc = cookie; 250 pci_chipset_tag_t pc = sc->sc_pc; 251 pcitag_t tag = sc->sc_pcitag; 252 253 switch (why) { 254 case PWR_SUSPEND: 255 pci_conf_capture(pc, tag, &sc->sc_pciconf); 256 sc->sc_devact[0] = pci_conf_read(pc, tag, PIIX_DEVACTA); 257 sc->sc_devact[1] = pci_conf_read(pc, tag, PIIX_DEVACTB); 258 break; 259 case PWR_RESUME: 260 pci_conf_restore(pc, tag, &sc->sc_pciconf); 261 pci_conf_write(pc, tag, PIIX_DEVACTA, sc->sc_devact[0]); 262 pci_conf_write(pc, tag, PIIX_DEVACTB, sc->sc_devact[1]); 263 break; 264 } 265 266 return; 267 } 268 269 int 270 piixpm_i2c_acquire_bus(void *cookie, int flags) 271 { 272 struct piixpm_softc *sc = cookie; 273 274 if (cold || sc->sc_poll || (flags & I2C_F_POLL)) 275 return (0); 276 277 rw_enter(&sc->sc_i2c_rwlock, RW_WRITER); 278 return 0; 279 } 280 281 void 282 piixpm_i2c_release_bus(void *cookie, int flags) 283 { 284 struct piixpm_softc *sc = cookie; 285 286 if (cold || sc->sc_poll || (flags & I2C_F_POLL)) 287 return; 288 289 rw_exit(&sc->sc_i2c_rwlock); 290 } 291 292 int 293 piixpm_i2c_exec(void *cookie, i2c_op_t op, i2c_addr_t addr, 294 const void *cmdbuf, size_t cmdlen, void *buf, size_t len, int flags) 295 { 296 struct piixpm_softc *sc = cookie; 297 const u_int8_t *b; 298 u_int8_t ctl = 0, st; 299 int retries; 300 301 DPRINTF(("%s: exec: op %d, addr 0x%x, cmdlen %d, len %d, flags 0x%x\n", 302 sc->sc_dev.dv_xname, op, addr, cmdlen, len, flags)); 303 304 /* Wait for bus to be idle */ 305 for (retries = 100; retries > 0; retries--) { 306 st = bus_space_read_1(sc->sc_smb_iot, sc->sc_smb_ioh, 307 PIIX_SMB_HS); 308 if (!(st & PIIX_SMB_HS_BUSY)) 309 break; 310 DELAY(PIIXPM_DELAY); 311 } 312 DPRINTF(("%s: exec: st 0x%d\n", sc->sc_dev.dv_xname, st & 0xff)); 313 if (st & PIIX_SMB_HS_BUSY) 314 return (1); 315 316 if (cold || sc->sc_poll) 317 flags |= I2C_F_POLL; 318 319 if (!I2C_OP_STOP_P(op) || cmdlen > 1 || len > 2) 320 return (1); 321 322 /* Setup transfer */ 323 sc->sc_i2c_xfer.op = op; 324 sc->sc_i2c_xfer.buf = buf; 325 sc->sc_i2c_xfer.len = len; 326 sc->sc_i2c_xfer.flags = flags; 327 sc->sc_i2c_xfer.error = 0; 328 329 /* Set slave address and transfer direction */ 330 bus_space_write_1(sc->sc_smb_iot, sc->sc_smb_ioh, PIIX_SMB_TXSLVA, 331 PIIX_SMB_TXSLVA_ADDR(addr) | 332 (I2C_OP_READ_P(op) ? PIIX_SMB_TXSLVA_READ : 0)); 333 334 b = cmdbuf; 335 if (cmdlen > 0) 336 /* Set command byte */ 337 bus_space_write_1(sc->sc_smb_iot, sc->sc_smb_ioh, 338 PIIX_SMB_HCMD, b[0]); 339 340 if (I2C_OP_WRITE_P(op)) { 341 /* Write data */ 342 b = buf; 343 if (len > 0) 344 bus_space_write_1(sc->sc_smb_iot, sc->sc_smb_ioh, 345 PIIX_SMB_HD0, b[0]); 346 if (len > 1) 347 bus_space_write_1(sc->sc_smb_iot, sc->sc_smb_ioh, 348 PIIX_SMB_HD1, b[1]); 349 } 350 351 /* Set SMBus command */ 352 if (len == 0) 353 ctl = PIIX_SMB_HC_CMD_BYTE; 354 else if (len == 1) 355 ctl = PIIX_SMB_HC_CMD_BDATA; 356 else if (len == 2) 357 ctl = PIIX_SMB_HC_CMD_WDATA; 358 359 if ((flags & I2C_F_POLL) == 0) 360 ctl |= PIIX_SMB_HC_INTREN; 361 362 /* Start transaction */ 363 ctl |= PIIX_SMB_HC_START; 364 bus_space_write_1(sc->sc_smb_iot, sc->sc_smb_ioh, PIIX_SMB_HC, ctl); 365 366 if (flags & I2C_F_POLL) { 367 /* Poll for completion */ 368 DELAY(PIIXPM_DELAY); 369 for (retries = 1000; retries > 0; retries--) { 370 st = bus_space_read_1(sc->sc_smb_iot, sc->sc_smb_ioh, 371 PIIX_SMB_HS); 372 if ((st & PIIX_SMB_HS_BUSY) == 0) 373 break; 374 DELAY(PIIXPM_DELAY); 375 } 376 if (st & PIIX_SMB_HS_BUSY) 377 goto timeout; 378 piixpm_intr(sc); 379 } else { 380 /* Wait for interrupt */ 381 if (tsleep(sc, PRIBIO, "iicexec", PIIXPM_TIMEOUT * hz)) 382 goto timeout; 383 } 384 385 if (sc->sc_i2c_xfer.error) 386 return (1); 387 388 return (0); 389 390 timeout: 391 /* 392 * Transfer timeout. Kill the transaction and clear status bits. 393 */ 394 aprint_error("%s: timeout, status 0x%x\n", sc->sc_dev.dv_xname, st); 395 bus_space_write_1(sc->sc_smb_iot, sc->sc_smb_ioh, PIIX_SMB_HC, 396 PIIX_SMB_HC_KILL); 397 DELAY(PIIXPM_DELAY); 398 st = bus_space_read_1(sc->sc_smb_iot, sc->sc_smb_ioh, PIIX_SMB_HS); 399 if ((st & PIIX_SMB_HS_FAILED) == 0) 400 aprint_error("%s: transaction abort failed, status 0x%x\n", 401 sc->sc_dev.dv_xname, st); 402 bus_space_write_1(sc->sc_smb_iot, sc->sc_smb_ioh, PIIX_SMB_HS, st); 403 return (1); 404 } 405 406 int 407 piixpm_intr(void *arg) 408 { 409 struct piixpm_softc *sc = arg; 410 u_int8_t st; 411 u_int8_t *b; 412 size_t len; 413 414 /* Read status */ 415 st = bus_space_read_1(sc->sc_smb_iot, sc->sc_smb_ioh, PIIX_SMB_HS); 416 if ((st & PIIX_SMB_HS_BUSY) != 0 || (st & (PIIX_SMB_HS_INTR | 417 PIIX_SMB_HS_DEVERR | PIIX_SMB_HS_BUSERR | 418 PIIX_SMB_HS_FAILED)) == 0) 419 /* Interrupt was not for us */ 420 return (0); 421 422 DPRINTF(("%s: intr st 0x%d\n", sc->sc_dev.dv_xname, st & 0xff)); 423 424 /* Clear status bits */ 425 bus_space_write_1(sc->sc_smb_iot, sc->sc_smb_ioh, PIIX_SMB_HS, st); 426 427 /* Check for errors */ 428 if (st & (PIIX_SMB_HS_DEVERR | PIIX_SMB_HS_BUSERR | 429 PIIX_SMB_HS_FAILED)) { 430 sc->sc_i2c_xfer.error = 1; 431 goto done; 432 } 433 434 if (st & PIIX_SMB_HS_INTR) { 435 if (I2C_OP_WRITE_P(sc->sc_i2c_xfer.op)) 436 goto done; 437 438 /* Read data */ 439 b = sc->sc_i2c_xfer.buf; 440 len = sc->sc_i2c_xfer.len; 441 if (len > 0) 442 b[0] = bus_space_read_1(sc->sc_smb_iot, sc->sc_smb_ioh, 443 PIIX_SMB_HD0); 444 if (len > 1) 445 b[1] = bus_space_read_1(sc->sc_smb_iot, sc->sc_smb_ioh, 446 PIIX_SMB_HD1); 447 } 448 449 done: 450 if ((sc->sc_i2c_xfer.flags & I2C_F_POLL) == 0) 451 wakeup(sc); 452 return (1); 453 } 454
Indexes created Wed Oct 01 19:09:53 GMT 2025