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sys/dev/glxiic/glxiic.c
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1 /*- 2 * Copyright (c) 2011 Henrik Brix Andersen <brix@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 __FBSDID("$FreeBSD: releng/10.0/sys/dev/glxiic/glxiic.c 241885 2012-10-22 13:06:09Z eadler $"); 28 /* 29 * AMD Geode LX CS5536 System Management Bus controller. 30 * 31 * Although AMD refers to this device as an SMBus controller, it 32 * really is an I2C controller (It lacks SMBus ALERT# and Alert 33 * Response support). 34 * 35 * The driver is implemented as an interrupt-driven state machine, 36 * supporting both master and slave mode. 37 */ 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/bus.h> 41 #include <sys/kernel.h> 42 #include <sys/module.h> 43 #include <sys/lock.h> 44 #include <sys/mutex.h> 45 #include <sys/sysctl.h> 46 #ifdef GLXIIC_DEBUG 47 #include <sys/syslog.h> 48 #endif 49 50 #include <dev/pci/pcireg.h> 51 #include <dev/pci/pcivar.h> 52 53 #include <machine/bus.h> 54 #include <sys/rman.h> 55 #include <machine/resource.h> 56 57 #include <dev/iicbus/iiconf.h> 58 #include <dev/iicbus/iicbus.h> 59 60 #include "iicbus_if.h" 61 62 /* CS5536 PCI-ISA ID. */ 63 #define GLXIIC_CS5536_DEV_ID 0x20901022 64 65 /* MSRs. */ 66 #define GLXIIC_MSR_PIC_YSEL_HIGH 0x51400021 67 68 /* Bus speeds. */ 69 #define GLXIIC_SLOW 0x0258 /* 10 kHz. */ 70 #define GLXIIC_FAST 0x0078 /* 50 kHz. */ 71 #define GLXIIC_FASTEST 0x003c /* 100 kHz. */ 72 73 /* Default bus activity timeout in milliseconds. */ 74 #define GLXIIC_DEFAULT_TIMEOUT 35 75 76 /* GPIO register offsets. */ 77 #define GLXIIC_GPIOL_OUT_AUX1_SEL 0x10 78 #define GLXIIC_GPIOL_IN_AUX1_SEL 0x34 79 80 /* GPIO 14 (SMB_CLK) and 15 (SMB_DATA) bitmasks. */ 81 #define GLXIIC_GPIO_14_15_ENABLE 0x0000c000 82 #define GLXIIC_GPIO_14_15_DISABLE 0xc0000000 83 84 /* SMB register offsets. */ 85 #define GLXIIC_SMB_SDA 0x00 86 #define GLXIIC_SMB_STS 0x01 87 #define GLXIIC_SMB_STS_SLVSTP_BIT (1 << 7) 88 #define GLXIIC_SMB_STS_SDAST_BIT (1 << 6) 89 #define GLXIIC_SMB_STS_BER_BIT (1 << 5) 90 #define GLXIIC_SMB_STS_NEGACK_BIT (1 << 4) 91 #define GLXIIC_SMB_STS_STASTR_BIT (1 << 3) 92 #define GLXIIC_SMB_STS_NMATCH_BIT (1 << 2) 93 #define GLXIIC_SMB_STS_MASTER_BIT (1 << 1) 94 #define GLXIIC_SMB_STS_XMIT_BIT (1 << 0) 95 #define GLXIIC_SMB_CTRL_STS 0x02 96 #define GLXIIC_SMB_CTRL_STS_TGSCL_BIT (1 << 5) 97 #define GLXIIC_SMB_CTRL_STS_TSDA_BIT (1 << 4) 98 #define GLXIIC_SMB_CTRL_STS_GCMTCH_BIT (1 << 3) 99 #define GLXIIC_SMB_CTRL_STS_MATCH_BIT (1 << 2) 100 #define GLXIIC_SMB_CTRL_STS_BB_BIT (1 << 1) 101 #define GLXIIC_SMB_CTRL_STS_BUSY_BIT (1 << 0) 102 #define GLXIIC_SMB_CTRL1 0x03 103 #define GLXIIC_SMB_CTRL1_STASTRE_BIT (1 << 7) 104 #define GLXIIC_SMB_CTRL1_NMINTE_BIT (1 << 6) 105 #define GLXIIC_SMB_CTRL1_GCMEN_BIT (1 << 5) 106 #define GLXIIC_SMB_CTRL1_ACK_BIT (1 << 4) 107 #define GLXIIC_SMB_CTRL1_INTEN_BIT (1 << 2) 108 #define GLXIIC_SMB_CTRL1_STOP_BIT (1 << 1) 109 #define GLXIIC_SMB_CTRL1_START_BIT (1 << 0) 110 #define GLXIIC_SMB_ADDR 0x04 111 #define GLXIIC_SMB_ADDR_SAEN_BIT (1 << 7) 112 #define GLXIIC_SMB_CTRL2 0x05 113 #define GLXIIC_SMB_CTRL2_EN_BIT (1 << 0) 114 #define GLXIIC_SMB_CTRL3 0x06 115 116 typedef enum { 117 GLXIIC_STATE_IDLE, 118 GLXIIC_STATE_SLAVE_TX, 119 GLXIIC_STATE_SLAVE_RX, 120 GLXIIC_STATE_MASTER_ADDR, 121 GLXIIC_STATE_MASTER_TX, 122 GLXIIC_STATE_MASTER_RX, 123 GLXIIC_STATE_MASTER_STOP, 124 GLXIIC_STATE_MAX, 125 } glxiic_state_t; 126 127 struct glxiic_softc { 128 device_t dev; /* Myself. */ 129 device_t iicbus; /* IIC bus. */ 130 struct mtx mtx; /* Lock. */ 131 glxiic_state_t state; /* Driver state. */ 132 struct callout callout; /* Driver state timeout callout. */ 133 int timeout; /* Driver state timeout (ms). */ 134 135 int smb_rid; /* SMB controller resource ID. */ 136 struct resource *smb_res; /* SMB controller resource. */ 137 int gpio_rid; /* GPIO resource ID. */ 138 struct resource *gpio_res; /* GPIO resource. */ 139 140 int irq_rid; /* IRQ resource ID. */ 141 struct resource *irq_res; /* IRQ resource. */ 142 void *irq_handler; /* IRQ handler cookie. */ 143 int old_irq; /* IRQ mapped by board firmware. */ 144 145 struct iic_msg *msg; /* Current master mode message. */ 146 uint32_t nmsgs; /* Number of messages remaining. */ 147 uint8_t *data; /* Current master mode data byte. */ 148 uint16_t ndata; /* Number of data bytes remaining. */ 149 int error; /* Last master mode error. */ 150 151 uint8_t addr; /* Own address. */ 152 uint16_t sclfrq; /* Bus frequency. */ 153 }; 154 155 #ifdef GLXIIC_DEBUG 156 #define GLXIIC_DEBUG_LOG(fmt, args...) \ 157 log(LOG_DEBUG, "%s: " fmt "\n" , __func__ , ## args) 158 #else 159 #define GLXIIC_DEBUG_LOG(fmt, args...) 160 #endif 161 162 #define GLXIIC_SCLFRQ(n) ((n << 1)) 163 #define GLXIIC_SMBADDR(n) ((n >> 1)) 164 #define GLXIIC_SMB_IRQ_TO_MAP(n) ((n << 16)) 165 #define GLXIIC_MAP_TO_SMB_IRQ(n) ((n >> 16) & 0xf) 166 167 #define GLXIIC_LOCK(_sc) mtx_lock(&_sc->mtx) 168 #define GLXIIC_UNLOCK(_sc) mtx_unlock(&_sc->mtx) 169 #define GLXIIC_LOCK_INIT(_sc) \ 170 mtx_init(&_sc->mtx, device_get_nameunit(_sc->dev), "glxiic", MTX_DEF) 171 #define GLXIIC_SLEEP(_sc) \ 172 mtx_sleep(_sc, &_sc->mtx, IICPRI, "glxiic", 0) 173 #define GLXIIC_WAKEUP(_sc) wakeup(_sc); 174 #define GLXIIC_LOCK_DESTROY(_sc) mtx_destroy(&_sc->mtx); 175 #define GLXIIC_ASSERT_LOCKED(_sc) mtx_assert(&_sc->mtx, MA_OWNED); 176 177 typedef int (glxiic_state_callback_t)(struct glxiic_softc *sc, 178 uint8_t status); 179 180 static glxiic_state_callback_t glxiic_state_idle_callback; 181 static glxiic_state_callback_t glxiic_state_slave_tx_callback; 182 static glxiic_state_callback_t glxiic_state_slave_rx_callback; 183 static glxiic_state_callback_t glxiic_state_master_addr_callback; 184 static glxiic_state_callback_t glxiic_state_master_tx_callback; 185 static glxiic_state_callback_t glxiic_state_master_rx_callback; 186 static glxiic_state_callback_t glxiic_state_master_stop_callback; 187 188 struct glxiic_state_table_entry { 189 glxiic_state_callback_t *callback; 190 boolean_t master; 191 }; 192 typedef struct glxiic_state_table_entry glxiic_state_table_entry_t; 193 194 static glxiic_state_table_entry_t glxiic_state_table[GLXIIC_STATE_MAX] = { 195 [GLXIIC_STATE_IDLE] = { 196 .callback = &glxiic_state_idle_callback, 197 .master = FALSE, 198 }, 199 200 [GLXIIC_STATE_SLAVE_TX] = { 201 .callback = &glxiic_state_slave_tx_callback, 202 .master = FALSE, 203 }, 204 205 [GLXIIC_STATE_SLAVE_RX] = { 206 .callback = &glxiic_state_slave_rx_callback, 207 .master = FALSE, 208 }, 209 210 [GLXIIC_STATE_MASTER_ADDR] = { 211 .callback = &glxiic_state_master_addr_callback, 212 .master = TRUE, 213 }, 214 215 [GLXIIC_STATE_MASTER_TX] = { 216 .callback = &glxiic_state_master_tx_callback, 217 .master = TRUE, 218 }, 219 220 [GLXIIC_STATE_MASTER_RX] = { 221 .callback = &glxiic_state_master_rx_callback, 222 .master = TRUE, 223 }, 224 225 [GLXIIC_STATE_MASTER_STOP] = { 226 .callback = &glxiic_state_master_stop_callback, 227 .master = TRUE, 228 }, 229 }; 230 231 static void glxiic_identify(driver_t *driver, device_t parent); 232 static int glxiic_probe(device_t dev); 233 static int glxiic_attach(device_t dev); 234 static int glxiic_detach(device_t dev); 235 236 static uint8_t glxiic_read_status_locked(struct glxiic_softc *sc); 237 static void glxiic_stop_locked(struct glxiic_softc *sc); 238 static void glxiic_timeout(void *arg); 239 static void glxiic_start_timeout_locked(struct glxiic_softc *sc); 240 static void glxiic_set_state_locked(struct glxiic_softc *sc, 241 glxiic_state_t state); 242 static int glxiic_handle_slave_match_locked(struct glxiic_softc *sc, 243 uint8_t status); 244 static void glxiic_intr(void *arg); 245 246 static int glxiic_reset(device_t dev, u_char speed, u_char addr, 247 u_char *oldaddr); 248 static int glxiic_transfer(device_t dev, struct iic_msg *msgs, 249 uint32_t nmsgs); 250 251 static void glxiic_smb_map_interrupt(int irq); 252 static void glxiic_gpio_enable(struct glxiic_softc *sc); 253 static void glxiic_gpio_disable(struct glxiic_softc *sc); 254 static void glxiic_smb_enable(struct glxiic_softc *sc, uint8_t speed, 255 uint8_t addr); 256 static void glxiic_smb_disable(struct glxiic_softc *sc); 257 258 static device_method_t glxiic_methods[] = { 259 DEVMETHOD(device_identify, glxiic_identify), 260 DEVMETHOD(device_probe, glxiic_probe), 261 DEVMETHOD(device_attach, glxiic_attach), 262 DEVMETHOD(device_detach, glxiic_detach), 263 264 DEVMETHOD(iicbus_reset, glxiic_reset), 265 DEVMETHOD(iicbus_transfer, glxiic_transfer), 266 DEVMETHOD(iicbus_callback, iicbus_null_callback), 267 268 { 0, 0 } 269 }; 270 271 static driver_t glxiic_driver = { 272 "glxiic", 273 glxiic_methods, 274 sizeof(struct glxiic_softc), 275 }; 276 277 static devclass_t glxiic_devclass; 278 279 DRIVER_MODULE(glxiic, isab, glxiic_driver, glxiic_devclass, 0, 0); 280 DRIVER_MODULE(iicbus, glxiic, iicbus_driver, iicbus_devclass, 0, 0); 281 MODULE_DEPEND(glxiic, iicbus, 1, 1, 1); 282 283 static void 284 glxiic_identify(driver_t *driver, device_t parent) 285 { 286 287 /* Prevent child from being added more than once. */ 288 if (device_find_child(parent, driver->name, -1) != NULL) 289 return; 290 291 if (pci_get_devid(parent) == GLXIIC_CS5536_DEV_ID) { 292 if (device_add_child(parent, driver->name, -1) == NULL) 293 device_printf(parent, "Could not add glxiic child\n"); 294 } 295 } 296 297 static int 298 glxiic_probe(device_t dev) 299 { 300 301 if (resource_disabled("glxiic", device_get_unit(dev))) 302 return (ENXIO); 303 304 device_set_desc(dev, "AMD Geode CS5536 SMBus controller"); 305 306 return (BUS_PROBE_DEFAULT); 307 } 308 309 static int 310 glxiic_attach(device_t dev) 311 { 312 struct glxiic_softc *sc; 313 struct sysctl_ctx_list *ctx; 314 struct sysctl_oid *tree; 315 int error, irq, unit; 316 uint32_t irq_map; 317 char tn[32]; 318 319 sc = device_get_softc(dev); 320 sc->dev = dev; 321 sc->state = GLXIIC_STATE_IDLE; 322 error = 0; 323 324 GLXIIC_LOCK_INIT(sc); 325 callout_init_mtx(&sc->callout, &sc->mtx, 0); 326 327 sc->smb_rid = PCIR_BAR(0); 328 sc->smb_res = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &sc->smb_rid, 329 RF_ACTIVE); 330 if (sc->smb_res == NULL) { 331 device_printf(dev, "Could not allocate SMBus I/O port\n"); 332 error = ENXIO; 333 goto out; 334 } 335 336 sc->gpio_rid = PCIR_BAR(1); 337 sc->gpio_res = bus_alloc_resource_any(dev, SYS_RES_IOPORT, 338 &sc->gpio_rid, RF_SHAREABLE | RF_ACTIVE); 339 if (sc->gpio_res == NULL) { 340 device_printf(dev, "Could not allocate GPIO I/O port\n"); 341 error = ENXIO; 342 goto out; 343 } 344 345 /* Ensure the controller is not enabled by firmware. */ 346 glxiic_smb_disable(sc); 347 348 /* Read the existing IRQ map. */ 349 irq_map = rdmsr(GLXIIC_MSR_PIC_YSEL_HIGH); 350 sc->old_irq = GLXIIC_MAP_TO_SMB_IRQ(irq_map); 351 352 unit = device_get_unit(dev); 353 if (resource_int_value("glxiic", unit, "irq", &irq) == 0) { 354 if (irq < 1 || irq > 15) { 355 device_printf(dev, "Bad value %d for glxiic.%d.irq\n", 356 irq, unit); 357 error = ENXIO; 358 goto out; 359 } 360 361 if (bootverbose) 362 device_printf(dev, "Using irq %d set by hint\n", irq); 363 } else if (sc->old_irq != 0) { 364 if (bootverbose) 365 device_printf(dev, "Using irq %d set by firmware\n", 366 irq); 367 irq = sc->old_irq; 368 } else { 369 device_printf(dev, "No irq mapped by firmware"); 370 printf(" and no glxiic.%d.irq hint provided\n", unit); 371 error = ENXIO; 372 goto out; 373 } 374 375 /* Map the SMBus interrupt to the requested legacy IRQ. */ 376 glxiic_smb_map_interrupt(irq); 377 378 sc->irq_rid = 0; 379 sc->irq_res = bus_alloc_resource(dev, SYS_RES_IRQ, &sc->irq_rid, 380 irq, irq, 1, RF_SHAREABLE | RF_ACTIVE); 381 if (sc->irq_res == NULL) { 382 device_printf(dev, "Could not allocate IRQ %d\n", irq); 383 error = ENXIO; 384 goto out; 385 } 386 387 error = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC | INTR_MPSAFE, 388 NULL, glxiic_intr, sc, &(sc->irq_handler)); 389 if (error != 0) { 390 device_printf(dev, "Could not setup IRQ handler\n"); 391 error = ENXIO; 392 goto out; 393 } 394 395 if ((sc->iicbus = device_add_child(dev, "iicbus", -1)) == NULL) { 396 device_printf(dev, "Could not allocate iicbus instance\n"); 397 error = ENXIO; 398 goto out; 399 } 400 401 ctx = device_get_sysctl_ctx(dev); 402 tree = device_get_sysctl_tree(dev); 403 404 sc->timeout = GLXIIC_DEFAULT_TIMEOUT; 405 snprintf(tn, sizeof(tn), "dev.glxiic.%d.timeout", unit); 406 TUNABLE_INT_FETCH(tn, &sc->timeout); 407 SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO, 408 "timeout", CTLFLAG_RW | CTLFLAG_TUN, &sc->timeout, 0, 409 "activity timeout in ms"); 410 411 glxiic_gpio_enable(sc); 412 glxiic_smb_enable(sc, IIC_FASTEST, 0); 413 414 error = bus_generic_attach(dev); 415 if (error != 0) { 416 device_printf(dev, "Could not probe and attach children\n"); 417 error = ENXIO; 418 } 419 out: 420 if (error != 0) { 421 callout_drain(&sc->callout); 422 423 if (sc->iicbus != NULL) 424 device_delete_child(dev, sc->iicbus); 425 if (sc->smb_res != NULL) { 426 glxiic_smb_disable(sc); 427 bus_release_resource(dev, SYS_RES_IOPORT, sc->smb_rid, 428 sc->smb_res); 429 } 430 if (sc->gpio_res != NULL) { 431 glxiic_gpio_disable(sc); 432 bus_release_resource(dev, SYS_RES_IOPORT, sc->gpio_rid, 433 sc->gpio_res); 434 } 435 if (sc->irq_handler != NULL) 436 bus_teardown_intr(dev, sc->irq_res, sc->irq_handler); 437 if (sc->irq_res != NULL) 438 bus_release_resource(dev, SYS_RES_IRQ, sc->irq_rid, 439 sc->irq_res); 440 441 /* Restore the old SMBus interrupt mapping. */ 442 glxiic_smb_map_interrupt(sc->old_irq); 443 444 GLXIIC_LOCK_DESTROY(sc); 445 } 446 447 return (error); 448 } 449 450 static int 451 glxiic_detach(device_t dev) 452 { 453 struct glxiic_softc *sc; 454 int error; 455 456 sc = device_get_softc(dev); 457 458 error = bus_generic_detach(dev); 459 if (error != 0) 460 goto out; 461 if (sc->iicbus != NULL) 462 error = device_delete_child(dev, sc->iicbus); 463 464 out: 465 callout_drain(&sc->callout); 466 467 if (sc->smb_res != NULL) { 468 glxiic_smb_disable(sc); 469 bus_release_resource(dev, SYS_RES_IOPORT, sc->smb_rid, 470 sc->smb_res); 471 } 472 if (sc->gpio_res != NULL) { 473 glxiic_gpio_disable(sc); 474 bus_release_resource(dev, SYS_RES_IOPORT, sc->gpio_rid, 475 sc->gpio_res); 476 } 477 if (sc->irq_handler != NULL) 478 bus_teardown_intr(dev, sc->irq_res, sc->irq_handler); 479 if (sc->irq_res != NULL) 480 bus_release_resource(dev, SYS_RES_IRQ, sc->irq_rid, 481 sc->irq_res); 482 483 /* Restore the old SMBus interrupt mapping. */ 484 glxiic_smb_map_interrupt(sc->old_irq); 485 486 GLXIIC_LOCK_DESTROY(sc); 487 488 return (error); 489 } 490 491 static uint8_t 492 glxiic_read_status_locked(struct glxiic_softc *sc) 493 { 494 uint8_t status; 495 496 GLXIIC_ASSERT_LOCKED(sc); 497 498 status = bus_read_1(sc->smb_res, GLXIIC_SMB_STS); 499 500 /* Clear all status flags except SDAST and STASTR after reading. */ 501 bus_write_1(sc->smb_res, GLXIIC_SMB_STS, (GLXIIC_SMB_STS_SLVSTP_BIT | 502 GLXIIC_SMB_STS_BER_BIT | GLXIIC_SMB_STS_NEGACK_BIT | 503 GLXIIC_SMB_STS_NMATCH_BIT)); 504 505 return (status); 506 } 507 508 static void 509 glxiic_stop_locked(struct glxiic_softc *sc) 510 { 511 uint8_t status, ctrl1; 512 513 GLXIIC_ASSERT_LOCKED(sc); 514 515 status = glxiic_read_status_locked(sc); 516 517 ctrl1 = bus_read_1(sc->smb_res, GLXIIC_SMB_CTRL1); 518 bus_write_1(sc->smb_res, GLXIIC_SMB_CTRL1, 519 ctrl1 | GLXIIC_SMB_CTRL1_STOP_BIT); 520 521 /* 522 * Perform a dummy read of SDA in master receive mode to clear 523 * SDAST if set. 524 */ 525 if ((status & GLXIIC_SMB_STS_XMIT_BIT) == 0 && 526 (status & GLXIIC_SMB_STS_SDAST_BIT) != 0) 527 bus_read_1(sc->smb_res, GLXIIC_SMB_SDA); 528 529 /* Check stall after start bit and clear if needed */ 530 if ((status & GLXIIC_SMB_STS_STASTR_BIT) != 0) { 531 bus_write_1(sc->smb_res, GLXIIC_SMB_STS, 532 GLXIIC_SMB_STS_STASTR_BIT); 533 } 534 } 535 536 static void 537 glxiic_timeout(void *arg) 538 { 539 struct glxiic_softc *sc; 540 uint8_t error; 541 542 sc = (struct glxiic_softc *)arg; 543 544 GLXIIC_DEBUG_LOG("timeout in state %d", sc->state); 545 546 if (glxiic_state_table[sc->state].master) { 547 sc->error = IIC_ETIMEOUT; 548 GLXIIC_WAKEUP(sc); 549 } else { 550 error = IIC_ETIMEOUT; 551 iicbus_intr(sc->iicbus, INTR_ERROR, &error); 552 } 553 554 glxiic_smb_disable(sc); 555 glxiic_smb_enable(sc, IIC_UNKNOWN, sc->addr); 556 glxiic_set_state_locked(sc, GLXIIC_STATE_IDLE); 557 } 558 559 static void 560 glxiic_start_timeout_locked(struct glxiic_softc *sc) 561 { 562 563 GLXIIC_ASSERT_LOCKED(sc); 564 565 callout_reset(&sc->callout, sc->timeout * 1000 / hz, glxiic_timeout, 566 sc); 567 } 568 569 static void 570 glxiic_set_state_locked(struct glxiic_softc *sc, glxiic_state_t state) 571 { 572 573 GLXIIC_ASSERT_LOCKED(sc); 574 575 if (state == GLXIIC_STATE_IDLE) 576 callout_stop(&sc->callout); 577 else if (sc->timeout > 0) 578 glxiic_start_timeout_locked(sc); 579 580 sc->state = state; 581 } 582 583 static int 584 glxiic_handle_slave_match_locked(struct glxiic_softc *sc, uint8_t status) 585 { 586 uint8_t ctrl_sts, addr; 587 588 GLXIIC_ASSERT_LOCKED(sc); 589 590 ctrl_sts = bus_read_1(sc->smb_res, GLXIIC_SMB_CTRL_STS); 591 592 if ((ctrl_sts & GLXIIC_SMB_CTRL_STS_MATCH_BIT) != 0) { 593 if ((status & GLXIIC_SMB_STS_XMIT_BIT) != 0) { 594 addr = sc->addr | LSB; 595 glxiic_set_state_locked(sc, 596 GLXIIC_STATE_SLAVE_TX); 597 } else { 598 addr = sc->addr & ~LSB; 599 glxiic_set_state_locked(sc, 600 GLXIIC_STATE_SLAVE_RX); 601 } 602 iicbus_intr(sc->iicbus, INTR_START, &addr); 603 } else if ((ctrl_sts & GLXIIC_SMB_CTRL_STS_GCMTCH_BIT) != 0) { 604 addr = 0; 605 glxiic_set_state_locked(sc, GLXIIC_STATE_SLAVE_RX); 606 iicbus_intr(sc->iicbus, INTR_GENERAL, &addr); 607 } else { 608 GLXIIC_DEBUG_LOG("unknown slave match"); 609 return (IIC_ESTATUS); 610 } 611 612 return (IIC_NOERR); 613 } 614 615 static int 616 glxiic_state_idle_callback(struct glxiic_softc *sc, uint8_t status) 617 { 618 619 GLXIIC_ASSERT_LOCKED(sc); 620 621 if ((status & GLXIIC_SMB_STS_BER_BIT) != 0) { 622 GLXIIC_DEBUG_LOG("bus error in idle"); 623 return (IIC_EBUSERR); 624 } 625 626 if ((status & GLXIIC_SMB_STS_NMATCH_BIT) != 0) { 627 return (glxiic_handle_slave_match_locked(sc, status)); 628 } 629 630 return (IIC_NOERR); 631 } 632 633 static int 634 glxiic_state_slave_tx_callback(struct glxiic_softc *sc, uint8_t status) 635 { 636 uint8_t data; 637 638 GLXIIC_ASSERT_LOCKED(sc); 639 640 if ((status & GLXIIC_SMB_STS_BER_BIT) != 0) { 641 GLXIIC_DEBUG_LOG("bus error in slave tx"); 642 return (IIC_EBUSERR); 643 } 644 645 if ((status & GLXIIC_SMB_STS_SLVSTP_BIT) != 0) { 646 iicbus_intr(sc->iicbus, INTR_STOP, NULL); 647 glxiic_set_state_locked(sc, GLXIIC_STATE_IDLE); 648 return (IIC_NOERR); 649 } 650 651 if ((status & GLXIIC_SMB_STS_NEGACK_BIT) != 0) { 652 iicbus_intr(sc->iicbus, INTR_NOACK, NULL); 653 return (IIC_NOERR); 654 } 655 656 if ((status & GLXIIC_SMB_STS_NMATCH_BIT) != 0) { 657 /* Handle repeated start in slave mode. */ 658 return (glxiic_handle_slave_match_locked(sc, status)); 659 } 660 661 if ((status & GLXIIC_SMB_STS_SDAST_BIT) == 0) { 662 GLXIIC_DEBUG_LOG("not awaiting data in slave tx"); 663 return (IIC_ESTATUS); 664 } 665 666 iicbus_intr(sc->iicbus, INTR_TRANSMIT, &data); 667 bus_write_1(sc->smb_res, GLXIIC_SMB_SDA, data); 668 669 glxiic_start_timeout_locked(sc); 670 671 return (IIC_NOERR); 672 } 673 674 static int 675 glxiic_state_slave_rx_callback(struct glxiic_softc *sc, uint8_t status) 676 { 677 uint8_t data; 678 679 GLXIIC_ASSERT_LOCKED(sc); 680 681 if ((status & GLXIIC_SMB_STS_BER_BIT) != 0) { 682 GLXIIC_DEBUG_LOG("bus error in slave rx"); 683 return (IIC_EBUSERR); 684 } 685 686 if ((status & GLXIIC_SMB_STS_SLVSTP_BIT) != 0) { 687 iicbus_intr(sc->iicbus, INTR_STOP, NULL); 688 glxiic_set_state_locked(sc, GLXIIC_STATE_IDLE); 689 return (IIC_NOERR); 690 } 691 692 if ((status & GLXIIC_SMB_STS_NMATCH_BIT) != 0) { 693 /* Handle repeated start in slave mode. */ 694 return (glxiic_handle_slave_match_locked(sc, status)); 695 } 696 697 if ((status & GLXIIC_SMB_STS_SDAST_BIT) == 0) { 698 GLXIIC_DEBUG_LOG("no pending data in slave rx"); 699 return (IIC_ESTATUS); 700 } 701 702 data = bus_read_1(sc->smb_res, GLXIIC_SMB_SDA); 703 iicbus_intr(sc->iicbus, INTR_RECEIVE, &data); 704 705 glxiic_start_timeout_locked(sc); 706 707 return (IIC_NOERR); 708 } 709 710 static int 711 glxiic_state_master_addr_callback(struct glxiic_softc *sc, uint8_t status) 712 { 713 uint8_t slave; 714 715 GLXIIC_ASSERT_LOCKED(sc); 716 717 if ((status & GLXIIC_SMB_STS_BER_BIT) != 0) { 718 GLXIIC_DEBUG_LOG("bus error after master start"); 719 return (IIC_EBUSERR); 720 } 721 722 if ((status & GLXIIC_SMB_STS_MASTER_BIT) == 0) { 723 GLXIIC_DEBUG_LOG("not bus master after master start"); 724 return (IIC_ESTATUS); 725 } 726 727 if ((status & GLXIIC_SMB_STS_SDAST_BIT) == 0) { 728 GLXIIC_DEBUG_LOG("not awaiting address in master addr"); 729 return (IIC_ESTATUS); 730 } 731 732 if ((sc->msg->flags & IIC_M_RD) != 0) { 733 slave = sc->msg->slave | LSB; 734 glxiic_set_state_locked(sc, GLXIIC_STATE_MASTER_RX); 735 } else { 736 slave = sc->msg->slave & ~LSB; 737 glxiic_set_state_locked(sc, GLXIIC_STATE_MASTER_TX); 738 } 739 740 sc->data = sc->msg->buf; 741 sc->ndata = sc->msg->len; 742 743 /* Handle address-only transfer. */ 744 if (sc->ndata == 0) 745 glxiic_set_state_locked(sc, GLXIIC_STATE_MASTER_STOP); 746 747 bus_write_1(sc->smb_res, GLXIIC_SMB_SDA, slave); 748 749 return (IIC_NOERR); 750 } 751 752 static int 753 glxiic_state_master_tx_callback(struct glxiic_softc *sc, uint8_t status) 754 { 755 756 GLXIIC_ASSERT_LOCKED(sc); 757 758 if ((status & GLXIIC_SMB_STS_BER_BIT) != 0) { 759 GLXIIC_DEBUG_LOG("bus error in master tx"); 760 return (IIC_EBUSERR); 761 } 762 763 if ((status & GLXIIC_SMB_STS_MASTER_BIT) == 0) { 764 GLXIIC_DEBUG_LOG("not bus master in master tx"); 765 return (IIC_ESTATUS); 766 } 767 768 if ((status & GLXIIC_SMB_STS_NEGACK_BIT) != 0) { 769 GLXIIC_DEBUG_LOG("slave nack in master tx"); 770 return (IIC_ENOACK); 771 } 772 773 if ((status & GLXIIC_SMB_STS_STASTR_BIT) != 0) { 774 bus_write_1(sc->smb_res, GLXIIC_SMB_STS, 775 GLXIIC_SMB_STS_STASTR_BIT); 776 } 777 778 if ((status & GLXIIC_SMB_STS_SDAST_BIT) == 0) { 779 GLXIIC_DEBUG_LOG("not awaiting data in master tx"); 780 return (IIC_ESTATUS); 781 } 782 783 bus_write_1(sc->smb_res, GLXIIC_SMB_SDA, *sc->data++); 784 if (--sc->ndata == 0) 785 glxiic_set_state_locked(sc, GLXIIC_STATE_MASTER_STOP); 786 else 787 glxiic_start_timeout_locked(sc); 788 789 return (IIC_NOERR); 790 } 791 792 static int 793 glxiic_state_master_rx_callback(struct glxiic_softc *sc, uint8_t status) 794 { 795 uint8_t ctrl1; 796 797 GLXIIC_ASSERT_LOCKED(sc); 798 799 if ((status & GLXIIC_SMB_STS_BER_BIT) != 0) { 800 GLXIIC_DEBUG_LOG("bus error in master rx"); 801 return (IIC_EBUSERR); 802 } 803 804 if ((status & GLXIIC_SMB_STS_MASTER_BIT) == 0) { 805 GLXIIC_DEBUG_LOG("not bus master in master rx"); 806 return (IIC_ESTATUS); 807 } 808 809 if ((status & GLXIIC_SMB_STS_NEGACK_BIT) != 0) { 810 GLXIIC_DEBUG_LOG("slave nack in rx"); 811 return (IIC_ENOACK); 812 } 813 814 if (sc->ndata == 1) { 815 /* Last byte from slave, set NACK. */ 816 ctrl1 = bus_read_1(sc->smb_res, GLXIIC_SMB_CTRL1); 817 bus_write_1(sc->smb_res, GLXIIC_SMB_CTRL1, 818 ctrl1 | GLXIIC_SMB_CTRL1_ACK_BIT); 819 } 820 821 if ((status & GLXIIC_SMB_STS_STASTR_BIT) != 0) { 822 /* Bus is stalled, clear and wait for data. */ 823 bus_write_1(sc->smb_res, GLXIIC_SMB_STS, 824 GLXIIC_SMB_STS_STASTR_BIT); 825 return (IIC_NOERR); 826 } 827 828 if ((status & GLXIIC_SMB_STS_SDAST_BIT) == 0) { 829 GLXIIC_DEBUG_LOG("no pending data in master rx"); 830 return (IIC_ESTATUS); 831 } 832 833 *sc->data++ = bus_read_1(sc->smb_res, GLXIIC_SMB_SDA); 834 if (--sc->ndata == 0) { 835 /* Proceed with stop on reading last byte. */ 836 glxiic_set_state_locked(sc, GLXIIC_STATE_MASTER_STOP); 837 return (glxiic_state_table[sc->state].callback(sc, status)); 838 } 839 840 glxiic_start_timeout_locked(sc); 841 842 return (IIC_NOERR); 843 } 844 845 static int 846 glxiic_state_master_stop_callback(struct glxiic_softc *sc, uint8_t status) 847 { 848 uint8_t ctrl1; 849 850 GLXIIC_ASSERT_LOCKED(sc); 851 852 if ((status & GLXIIC_SMB_STS_BER_BIT) != 0) { 853 GLXIIC_DEBUG_LOG("bus error in master stop"); 854 return (IIC_EBUSERR); 855 } 856 857 if ((status & GLXIIC_SMB_STS_MASTER_BIT) == 0) { 858 GLXIIC_DEBUG_LOG("not bus master in master stop"); 859 return (IIC_ESTATUS); 860 } 861 862 if ((status & GLXIIC_SMB_STS_NEGACK_BIT) != 0) { 863 GLXIIC_DEBUG_LOG("slave nack in master stop"); 864 return (IIC_ENOACK); 865 } 866 867 if (--sc->nmsgs > 0) { 868 /* Start transfer of next message. */ 869 if ((sc->msg->flags & IIC_M_NOSTOP) == 0) { 870 glxiic_stop_locked(sc); 871 } 872 873 ctrl1 = bus_read_1(sc->smb_res, GLXIIC_SMB_CTRL1); 874 bus_write_1(sc->smb_res, GLXIIC_SMB_CTRL1, 875 ctrl1 | GLXIIC_SMB_CTRL1_START_BIT); 876 877 glxiic_set_state_locked(sc, GLXIIC_STATE_MASTER_ADDR); 878 sc->msg++; 879 } else { 880 /* Last message. */ 881 glxiic_stop_locked(sc); 882 glxiic_set_state_locked(sc, GLXIIC_STATE_IDLE); 883 sc->error = IIC_NOERR; 884 GLXIIC_WAKEUP(sc); 885 } 886 887 return (IIC_NOERR); 888 } 889 890 static void 891 glxiic_intr(void *arg) 892 { 893 struct glxiic_softc *sc; 894 int error; 895 uint8_t status, data; 896 897 sc = (struct glxiic_softc *)arg; 898 899 GLXIIC_LOCK(sc); 900 901 status = glxiic_read_status_locked(sc); 902 903 /* Check if this interrupt originated from the SMBus. */ 904 if ((status & 905 ~(GLXIIC_SMB_STS_MASTER_BIT | GLXIIC_SMB_STS_XMIT_BIT)) != 0) { 906 907 error = glxiic_state_table[sc->state].callback(sc, status); 908 909 if (error != IIC_NOERR) { 910 if (glxiic_state_table[sc->state].master) { 911 glxiic_stop_locked(sc); 912 glxiic_set_state_locked(sc, GLXIIC_STATE_IDLE); 913 sc->error = error; 914 GLXIIC_WAKEUP(sc); 915 } else { 916 data = error & 0xff; 917 iicbus_intr(sc->iicbus, INTR_ERROR, &data); 918 glxiic_set_state_locked(sc, GLXIIC_STATE_IDLE); 919 } 920 } 921 } 922 923 GLXIIC_UNLOCK(sc); 924 } 925 926 static int 927 glxiic_reset(device_t dev, u_char speed, u_char addr, u_char *oldaddr) 928 { 929 struct glxiic_softc *sc; 930 931 sc = device_get_softc(dev); 932 933 GLXIIC_LOCK(sc); 934 935 if (oldaddr != NULL) 936 *oldaddr = sc->addr; 937 sc->addr = addr; 938 939 /* A disable/enable cycle resets the controller. */ 940 glxiic_smb_disable(sc); 941 glxiic_smb_enable(sc, speed, addr); 942 943 if (glxiic_state_table[sc->state].master) { 944 sc->error = IIC_ESTATUS; 945 GLXIIC_WAKEUP(sc); 946 } 947 glxiic_set_state_locked(sc, GLXIIC_STATE_IDLE); 948 949 GLXIIC_UNLOCK(sc); 950 951 return (IIC_NOERR); 952 } 953 954 static int 955 glxiic_transfer(device_t dev, struct iic_msg *msgs, uint32_t nmsgs) 956 { 957 struct glxiic_softc *sc; 958 int error; 959 uint8_t ctrl1; 960 961 sc = device_get_softc(dev); 962 963 GLXIIC_LOCK(sc); 964 965 if (sc->state != GLXIIC_STATE_IDLE) { 966 error = IIC_EBUSBSY; 967 goto out; 968 } 969 970 sc->msg = msgs; 971 sc->nmsgs = nmsgs; 972 glxiic_set_state_locked(sc, GLXIIC_STATE_MASTER_ADDR); 973 974 /* Set start bit and let glxiic_intr() handle the transfer. */ 975 ctrl1 = bus_read_1(sc->smb_res, GLXIIC_SMB_CTRL1); 976 bus_write_1(sc->smb_res, GLXIIC_SMB_CTRL1, 977 ctrl1 | GLXIIC_SMB_CTRL1_START_BIT); 978 979 GLXIIC_SLEEP(sc); 980 error = sc->error; 981 out: 982 GLXIIC_UNLOCK(sc); 983 984 return (error); 985 } 986 987 static void 988 glxiic_smb_map_interrupt(int irq) 989 { 990 uint32_t irq_map; 991 int old_irq; 992 993 /* Protect the read-modify-write operation. */ 994 critical_enter(); 995 996 irq_map = rdmsr(GLXIIC_MSR_PIC_YSEL_HIGH); 997 old_irq = GLXIIC_MAP_TO_SMB_IRQ(irq_map); 998 999 if (irq != old_irq) { 1000 irq_map &= ~GLXIIC_SMB_IRQ_TO_MAP(old_irq); 1001 irq_map |= GLXIIC_SMB_IRQ_TO_MAP(irq); 1002 wrmsr(GLXIIC_MSR_PIC_YSEL_HIGH, irq_map); 1003 } 1004 1005 critical_exit(); 1006 } 1007 1008 static void 1009 glxiic_gpio_enable(struct glxiic_softc *sc) 1010 { 1011 1012 bus_write_4(sc->gpio_res, GLXIIC_GPIOL_IN_AUX1_SEL, 1013 GLXIIC_GPIO_14_15_ENABLE); 1014 bus_write_4(sc->gpio_res, GLXIIC_GPIOL_OUT_AUX1_SEL, 1015 GLXIIC_GPIO_14_15_ENABLE); 1016 } 1017 1018 static void 1019 glxiic_gpio_disable(struct glxiic_softc *sc) 1020 { 1021 1022 bus_write_4(sc->gpio_res, GLXIIC_GPIOL_OUT_AUX1_SEL, 1023 GLXIIC_GPIO_14_15_DISABLE); 1024 bus_write_4(sc->gpio_res, GLXIIC_GPIOL_IN_AUX1_SEL, 1025 GLXIIC_GPIO_14_15_DISABLE); 1026 } 1027 1028 static void 1029 glxiic_smb_enable(struct glxiic_softc *sc, uint8_t speed, uint8_t addr) 1030 { 1031 uint8_t ctrl1; 1032 1033 ctrl1 = 0; 1034 1035 switch (speed) { 1036 case IIC_SLOW: 1037 sc->sclfrq = GLXIIC_SLOW; 1038 break; 1039 case IIC_FAST: 1040 sc->sclfrq = GLXIIC_FAST; 1041 break; 1042 case IIC_FASTEST: 1043 sc->sclfrq = GLXIIC_FASTEST; 1044 break; 1045 case IIC_UNKNOWN: 1046 default: 1047 /* Reuse last frequency. */ 1048 break; 1049 } 1050 1051 /* Set bus speed and enable controller. */ 1052 bus_write_2(sc->smb_res, GLXIIC_SMB_CTRL2, 1053 GLXIIC_SCLFRQ(sc->sclfrq) | GLXIIC_SMB_CTRL2_EN_BIT); 1054 1055 if (addr != 0) { 1056 /* Enable new match and global call match interrupts. */ 1057 ctrl1 |= GLXIIC_SMB_CTRL1_NMINTE_BIT | 1058 GLXIIC_SMB_CTRL1_GCMEN_BIT; 1059 bus_write_1(sc->smb_res, GLXIIC_SMB_ADDR, 1060 GLXIIC_SMB_ADDR_SAEN_BIT | GLXIIC_SMBADDR(addr)); 1061 } else { 1062 bus_write_1(sc->smb_res, GLXIIC_SMB_ADDR, 0); 1063 } 1064 1065 /* Enable stall after start and interrupt. */ 1066 bus_write_1(sc->smb_res, GLXIIC_SMB_CTRL1, 1067 ctrl1 | GLXIIC_SMB_CTRL1_STASTRE_BIT | GLXIIC_SMB_CTRL1_INTEN_BIT); 1068 } 1069 1070 static void 1071 glxiic_smb_disable(struct glxiic_softc *sc) 1072 { 1073 uint16_t sclfrq; 1074 1075 sclfrq = bus_read_2(sc->smb_res, GLXIIC_SMB_CTRL2); 1076 bus_write_2(sc->smb_res, GLXIIC_SMB_CTRL2, 1077 sclfrq & ~GLXIIC_SMB_CTRL2_EN_BIT); 1078 }
Cache object: 7209dd7cb0b45d905d6af19aa2557c2d
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