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/11.0/sys/dev/glxiic/glxiic.c 274819 2014-11-21 21:01:24Z smh $"); 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 116typedef 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 127struct 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 177typedef int (glxiic_state_callback_t)(struct glxiic_softc *sc, 178 uint8_t status); 179 180static glxiic_state_callback_t glxiic_state_idle_callback; 181static glxiic_state_callback_t glxiic_state_slave_tx_callback; 182static glxiic_state_callback_t glxiic_state_slave_rx_callback; 183static glxiic_state_callback_t glxiic_state_master_addr_callback; 184static glxiic_state_callback_t glxiic_state_master_tx_callback; 185static glxiic_state_callback_t glxiic_state_master_rx_callback; 186static glxiic_state_callback_t glxiic_state_master_stop_callback; 187 188struct glxiic_state_table_entry { 189 glxiic_state_callback_t *callback; 190 boolean_t master; 191}; 192typedef struct glxiic_state_table_entry glxiic_state_table_entry_t; 193 194static 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 231static void glxiic_identify(driver_t *driver, device_t parent); 232static int glxiic_probe(device_t dev); 233static int glxiic_attach(device_t dev); 234static int glxiic_detach(device_t dev); 235 236static uint8_t glxiic_read_status_locked(struct glxiic_softc *sc); 237static void glxiic_stop_locked(struct glxiic_softc *sc); 238static void glxiic_timeout(void *arg); 239static void glxiic_start_timeout_locked(struct glxiic_softc *sc); 240static void glxiic_set_state_locked(struct glxiic_softc *sc, 241 glxiic_state_t state); 242static int glxiic_handle_slave_match_locked(struct glxiic_softc *sc, 243 uint8_t status); 244static void glxiic_intr(void *arg); 245 246static int glxiic_reset(device_t dev, u_char speed, u_char addr, 247 u_char *oldaddr); 248static int glxiic_transfer(device_t dev, struct iic_msg *msgs, 249 uint32_t nmsgs); 250 251static void glxiic_smb_map_interrupt(int irq); 252static void glxiic_gpio_enable(struct glxiic_softc *sc); 253static void glxiic_gpio_disable(struct glxiic_softc *sc); 254static void glxiic_smb_enable(struct glxiic_softc *sc, uint8_t speed, 255 uint8_t addr); 256static void glxiic_smb_disable(struct glxiic_softc *sc); 257 258static 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 271static driver_t glxiic_driver = { 272 "glxiic", 273 glxiic_methods, 274 sizeof(struct glxiic_softc), 275}; 276 277static devclass_t glxiic_devclass; 278 279DRIVER_MODULE(glxiic, isab, glxiic_driver, glxiic_devclass, 0, 0); 280DRIVER_MODULE(iicbus, glxiic, iicbus_driver, iicbus_devclass, 0, 0); 281MODULE_DEPEND(glxiic, iicbus, 1, 1, 1); 282 283static void 284glxiic_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 297static int 298glxiic_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 309static int 310glxiic_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; 317 318 sc = device_get_softc(dev); 319 sc->dev = dev; 320 sc->state = GLXIIC_STATE_IDLE; 321 error = 0; 322 323 GLXIIC_LOCK_INIT(sc); 324 callout_init_mtx(&sc->callout, &sc->mtx, 0); 325 326 sc->smb_rid = PCIR_BAR(0); 327 sc->smb_res = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &sc->smb_rid, 328 RF_ACTIVE); 329 if (sc->smb_res == NULL) { 330 device_printf(dev, "Could not allocate SMBus I/O port\n"); 331 error = ENXIO; 332 goto out; 333 } 334 335 sc->gpio_rid = PCIR_BAR(1); 336 sc->gpio_res = bus_alloc_resource_any(dev, SYS_RES_IOPORT, 337 &sc->gpio_rid, RF_SHAREABLE | RF_ACTIVE); 338 if (sc->gpio_res == NULL) { 339 device_printf(dev, "Could not allocate GPIO I/O port\n"); 340 error = ENXIO; 341 goto out; 342 } 343 344 /* Ensure the controller is not enabled by firmware. */ 345 glxiic_smb_disable(sc); 346 347 /* Read the existing IRQ map. */ 348 irq_map = rdmsr(GLXIIC_MSR_PIC_YSEL_HIGH); 349 sc->old_irq = GLXIIC_MAP_TO_SMB_IRQ(irq_map); 350 351 unit = device_get_unit(dev); 352 if (resource_int_value("glxiic", unit, "irq", &irq) == 0) { 353 if (irq < 1 || irq > 15) { 354 device_printf(dev, "Bad value %d for glxiic.%d.irq\n", 355 irq, unit); 356 error = ENXIO; 357 goto out; 358 } 359 360 if (bootverbose) 361 device_printf(dev, "Using irq %d set by hint\n", irq); 362 } else if (sc->old_irq != 0) { 363 if (bootverbose) 364 device_printf(dev, "Using irq %d set by firmware\n", 365 irq); 366 irq = sc->old_irq; 367 } else { 368 device_printf(dev, "No irq mapped by firmware"); 369 printf(" and no glxiic.%d.irq hint provided\n", unit); 370 error = ENXIO; 371 goto out; 372 } 373 374 /* Map the SMBus interrupt to the requested legacy IRQ. */ 375 glxiic_smb_map_interrupt(irq); 376 377 sc->irq_rid = 0; 378 sc->irq_res = bus_alloc_resource(dev, SYS_RES_IRQ, &sc->irq_rid, 379 irq, irq, 1, RF_SHAREABLE | RF_ACTIVE); 380 if (sc->irq_res == NULL) { 381 device_printf(dev, "Could not allocate IRQ %d\n", irq); 382 error = ENXIO; 383 goto out; 384 } 385 386 error = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC | INTR_MPSAFE, 387 NULL, glxiic_intr, sc, &(sc->irq_handler)); 388 if (error != 0) { 389 device_printf(dev, "Could not setup IRQ handler\n"); 390 error = ENXIO; 391 goto out; 392 } 393 394 if ((sc->iicbus = device_add_child(dev, "iicbus", -1)) == NULL) { 395 device_printf(dev, "Could not allocate iicbus instance\n"); 396 error = ENXIO; 397 goto out; 398 } 399 400 ctx = device_get_sysctl_ctx(dev); 401 tree = device_get_sysctl_tree(dev); 402 403 sc->timeout = GLXIIC_DEFAULT_TIMEOUT; 404 SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO, 405 "timeout", CTLFLAG_RWTUN, &sc->timeout, 0, 406 "activity timeout in ms"); 407 408 glxiic_gpio_enable(sc); 409 glxiic_smb_enable(sc, IIC_FASTEST, 0); 410 411 error = bus_generic_attach(dev); 412 if (error != 0) { 413 device_printf(dev, "Could not probe and attach children\n"); 414 error = ENXIO; 415 } 416out: 417 if (error != 0) { 418 callout_drain(&sc->callout); 419 420 if (sc->iicbus != NULL) 421 device_delete_child(dev, sc->iicbus); 422 if (sc->smb_res != NULL) { 423 glxiic_smb_disable(sc); 424 bus_release_resource(dev, SYS_RES_IOPORT, sc->smb_rid, 425 sc->smb_res); 426 } 427 if (sc->gpio_res != NULL) { 428 glxiic_gpio_disable(sc); 429 bus_release_resource(dev, SYS_RES_IOPORT, sc->gpio_rid, 430 sc->gpio_res); 431 } 432 if (sc->irq_handler != NULL) 433 bus_teardown_intr(dev, sc->irq_res, sc->irq_handler); 434 if (sc->irq_res != NULL) 435 bus_release_resource(dev, SYS_RES_IRQ, sc->irq_rid, 436 sc->irq_res); 437 438 /* Restore the old SMBus interrupt mapping. */ 439 glxiic_smb_map_interrupt(sc->old_irq); 440 441 GLXIIC_LOCK_DESTROY(sc); 442 } 443 444 return (error); 445} 446 447static int 448glxiic_detach(device_t dev) 449{ 450 struct glxiic_softc *sc; 451 int error; 452 453 sc = device_get_softc(dev); 454 455 error = bus_generic_detach(dev); 456 if (error != 0) 457 goto out; 458 if (sc->iicbus != NULL) 459 error = device_delete_child(dev, sc->iicbus); 460 461out: 462 callout_drain(&sc->callout); 463 464 if (sc->smb_res != NULL) { 465 glxiic_smb_disable(sc); 466 bus_release_resource(dev, SYS_RES_IOPORT, sc->smb_rid, 467 sc->smb_res); 468 } 469 if (sc->gpio_res != NULL) { 470 glxiic_gpio_disable(sc); 471 bus_release_resource(dev, SYS_RES_IOPORT, sc->gpio_rid, 472 sc->gpio_res); 473 } 474 if (sc->irq_handler != NULL) 475 bus_teardown_intr(dev, sc->irq_res, sc->irq_handler); 476 if (sc->irq_res != NULL) 477 bus_release_resource(dev, SYS_RES_IRQ, sc->irq_rid, 478 sc->irq_res); 479 480 /* Restore the old SMBus interrupt mapping. */ 481 glxiic_smb_map_interrupt(sc->old_irq); 482 483 GLXIIC_LOCK_DESTROY(sc); 484 485 return (error); 486} 487 488static uint8_t 489glxiic_read_status_locked(struct glxiic_softc *sc) 490{ 491 uint8_t status; 492 493 GLXIIC_ASSERT_LOCKED(sc); 494 495 status = bus_read_1(sc->smb_res, GLXIIC_SMB_STS); 496 497 /* Clear all status flags except SDAST and STASTR after reading. */ 498 bus_write_1(sc->smb_res, GLXIIC_SMB_STS, (GLXIIC_SMB_STS_SLVSTP_BIT | 499 GLXIIC_SMB_STS_BER_BIT | GLXIIC_SMB_STS_NEGACK_BIT | 500 GLXIIC_SMB_STS_NMATCH_BIT)); 501 502 return (status); 503} 504 505static void 506glxiic_stop_locked(struct glxiic_softc *sc) 507{ 508 uint8_t status, ctrl1; 509 510 GLXIIC_ASSERT_LOCKED(sc); 511 512 status = glxiic_read_status_locked(sc); 513 514 ctrl1 = bus_read_1(sc->smb_res, GLXIIC_SMB_CTRL1); 515 bus_write_1(sc->smb_res, GLXIIC_SMB_CTRL1, 516 ctrl1 | GLXIIC_SMB_CTRL1_STOP_BIT); 517 518 /* 519 * Perform a dummy read of SDA in master receive mode to clear 520 * SDAST if set. 521 */ 522 if ((status & GLXIIC_SMB_STS_XMIT_BIT) == 0 && 523 (status & GLXIIC_SMB_STS_SDAST_BIT) != 0) 524 bus_read_1(sc->smb_res, GLXIIC_SMB_SDA); 525 526 /* Check stall after start bit and clear if needed */ 527 if ((status & GLXIIC_SMB_STS_STASTR_BIT) != 0) { 528 bus_write_1(sc->smb_res, GLXIIC_SMB_STS, 529 GLXIIC_SMB_STS_STASTR_BIT); 530 } 531} 532 533static void 534glxiic_timeout(void *arg) 535{ 536 struct glxiic_softc *sc; 537 uint8_t error; 538 539 sc = (struct glxiic_softc *)arg; 540 541 GLXIIC_DEBUG_LOG("timeout in state %d", sc->state); 542 543 if (glxiic_state_table[sc->state].master) { 544 sc->error = IIC_ETIMEOUT; 545 GLXIIC_WAKEUP(sc); 546 } else { 547 error = IIC_ETIMEOUT; 548 iicbus_intr(sc->iicbus, INTR_ERROR, &error); 549 } 550 551 glxiic_smb_disable(sc); 552 glxiic_smb_enable(sc, IIC_UNKNOWN, sc->addr); 553 glxiic_set_state_locked(sc, GLXIIC_STATE_IDLE); 554} 555 556static void 557glxiic_start_timeout_locked(struct glxiic_softc *sc) 558{ 559 560 GLXIIC_ASSERT_LOCKED(sc); 561 562 callout_reset_sbt(&sc->callout, SBT_1MS * sc->timeout, 0, 563 glxiic_timeout, sc, 0); 564} 565 566static void 567glxiic_set_state_locked(struct glxiic_softc *sc, glxiic_state_t state) 568{ 569 570 GLXIIC_ASSERT_LOCKED(sc); 571 572 if (state == GLXIIC_STATE_IDLE) 573 callout_stop(&sc->callout); 574 else if (sc->timeout > 0) 575 glxiic_start_timeout_locked(sc); 576 577 sc->state = state; 578} 579 580static int 581glxiic_handle_slave_match_locked(struct glxiic_softc *sc, uint8_t status) 582{ 583 uint8_t ctrl_sts, addr; 584 585 GLXIIC_ASSERT_LOCKED(sc); 586 587 ctrl_sts = bus_read_1(sc->smb_res, GLXIIC_SMB_CTRL_STS); 588 589 if ((ctrl_sts & GLXIIC_SMB_CTRL_STS_MATCH_BIT) != 0) { 590 if ((status & GLXIIC_SMB_STS_XMIT_BIT) != 0) { 591 addr = sc->addr | LSB; 592 glxiic_set_state_locked(sc, 593 GLXIIC_STATE_SLAVE_TX); 594 } else { 595 addr = sc->addr & ~LSB; 596 glxiic_set_state_locked(sc, 597 GLXIIC_STATE_SLAVE_RX); 598 } 599 iicbus_intr(sc->iicbus, INTR_START, &addr); 600 } else if ((ctrl_sts & GLXIIC_SMB_CTRL_STS_GCMTCH_BIT) != 0) { 601 addr = 0; 602 glxiic_set_state_locked(sc, GLXIIC_STATE_SLAVE_RX); 603 iicbus_intr(sc->iicbus, INTR_GENERAL, &addr); 604 } else { 605 GLXIIC_DEBUG_LOG("unknown slave match"); 606 return (IIC_ESTATUS); 607 } 608 609 return (IIC_NOERR); 610} 611 612static int 613glxiic_state_idle_callback(struct glxiic_softc *sc, uint8_t status) 614{ 615 616 GLXIIC_ASSERT_LOCKED(sc); 617 618 if ((status & GLXIIC_SMB_STS_BER_BIT) != 0) { 619 GLXIIC_DEBUG_LOG("bus error in idle"); 620 return (IIC_EBUSERR); 621 } 622 623 if ((status & GLXIIC_SMB_STS_NMATCH_BIT) != 0) { 624 return (glxiic_handle_slave_match_locked(sc, status)); 625 } 626 627 return (IIC_NOERR); 628} 629 630static int 631glxiic_state_slave_tx_callback(struct glxiic_softc *sc, uint8_t status) 632{ 633 uint8_t data; 634 635 GLXIIC_ASSERT_LOCKED(sc); 636 637 if ((status & GLXIIC_SMB_STS_BER_BIT) != 0) { 638 GLXIIC_DEBUG_LOG("bus error in slave tx"); 639 return (IIC_EBUSERR); 640 } 641 642 if ((status & GLXIIC_SMB_STS_SLVSTP_BIT) != 0) { 643 iicbus_intr(sc->iicbus, INTR_STOP, NULL); 644 glxiic_set_state_locked(sc, GLXIIC_STATE_IDLE); 645 return (IIC_NOERR); 646 } 647 648 if ((status & GLXIIC_SMB_STS_NEGACK_BIT) != 0) { 649 iicbus_intr(sc->iicbus, INTR_NOACK, NULL); 650 return (IIC_NOERR); 651 } 652 653 if ((status & GLXIIC_SMB_STS_NMATCH_BIT) != 0) { 654 /* Handle repeated start in slave mode. */ 655 return (glxiic_handle_slave_match_locked(sc, status)); 656 } 657 658 if ((status & GLXIIC_SMB_STS_SDAST_BIT) == 0) { 659 GLXIIC_DEBUG_LOG("not awaiting data in slave tx"); 660 return (IIC_ESTATUS); 661 } 662 663 iicbus_intr(sc->iicbus, INTR_TRANSMIT, &data); 664 bus_write_1(sc->smb_res, GLXIIC_SMB_SDA, data); 665 666 glxiic_start_timeout_locked(sc); 667 668 return (IIC_NOERR); 669} 670 671static int 672glxiic_state_slave_rx_callback(struct glxiic_softc *sc, uint8_t status) 673{ 674 uint8_t data; 675 676 GLXIIC_ASSERT_LOCKED(sc); 677 678 if ((status & GLXIIC_SMB_STS_BER_BIT) != 0) { 679 GLXIIC_DEBUG_LOG("bus error in slave rx"); 680 return (IIC_EBUSERR); 681 } 682 683 if ((status & GLXIIC_SMB_STS_SLVSTP_BIT) != 0) { 684 iicbus_intr(sc->iicbus, INTR_STOP, NULL); 685 glxiic_set_state_locked(sc, GLXIIC_STATE_IDLE); 686 return (IIC_NOERR); 687 } 688 689 if ((status & GLXIIC_SMB_STS_NMATCH_BIT) != 0) { 690 /* Handle repeated start in slave mode. */ 691 return (glxiic_handle_slave_match_locked(sc, status)); 692 } 693 694 if ((status & GLXIIC_SMB_STS_SDAST_BIT) == 0) { 695 GLXIIC_DEBUG_LOG("no pending data in slave rx"); 696 return (IIC_ESTATUS); 697 } 698 699 data = bus_read_1(sc->smb_res, GLXIIC_SMB_SDA); 700 iicbus_intr(sc->iicbus, INTR_RECEIVE, &data); 701 702 glxiic_start_timeout_locked(sc); 703 704 return (IIC_NOERR); 705} 706 707static int 708glxiic_state_master_addr_callback(struct glxiic_softc *sc, uint8_t status) 709{ 710 uint8_t slave; 711 uint8_t ctrl1; 712 713 GLXIIC_ASSERT_LOCKED(sc); 714 715 if ((status & GLXIIC_SMB_STS_BER_BIT) != 0) { 716 GLXIIC_DEBUG_LOG("bus error after master start"); 717 return (IIC_EBUSERR); 718 } 719 720 if ((status & GLXIIC_SMB_STS_MASTER_BIT) == 0) { 721 GLXIIC_DEBUG_LOG("not bus master after master start"); 722 return (IIC_ESTATUS); 723 } 724 725 if ((status & GLXIIC_SMB_STS_SDAST_BIT) == 0) { 726 GLXIIC_DEBUG_LOG("not awaiting address in master addr"); 727 return (IIC_ESTATUS); 728 } 729 730 if ((sc->msg->flags & IIC_M_RD) != 0) { 731 slave = sc->msg->slave | LSB; 732 glxiic_set_state_locked(sc, GLXIIC_STATE_MASTER_RX); 733 } else { 734 slave = sc->msg->slave & ~LSB; 735 glxiic_set_state_locked(sc, GLXIIC_STATE_MASTER_TX); 736 } 737 738 sc->data = sc->msg->buf; 739 sc->ndata = sc->msg->len; 740 741 /* Handle address-only transfer. */ 742 if (sc->ndata == 0) 743 glxiic_set_state_locked(sc, GLXIIC_STATE_MASTER_STOP); 744 745 bus_write_1(sc->smb_res, GLXIIC_SMB_SDA, slave); 746 747 if ((sc->msg->flags & IIC_M_RD) != 0 && sc->ndata == 1) { 748 /* Last byte from slave, set NACK. */ 749 ctrl1 = bus_read_1(sc->smb_res, GLXIIC_SMB_CTRL1); 750 bus_write_1(sc->smb_res, GLXIIC_SMB_CTRL1, 751 ctrl1 | GLXIIC_SMB_CTRL1_ACK_BIT); 752 } 753 754 return (IIC_NOERR); 755} 756 757static int 758glxiic_state_master_tx_callback(struct glxiic_softc *sc, uint8_t status) 759{ 760 761 GLXIIC_ASSERT_LOCKED(sc); 762 763 if ((status & GLXIIC_SMB_STS_BER_BIT) != 0) { 764 GLXIIC_DEBUG_LOG("bus error in master tx"); 765 return (IIC_EBUSERR); 766 } 767 768 if ((status & GLXIIC_SMB_STS_MASTER_BIT) == 0) { 769 GLXIIC_DEBUG_LOG("not bus master in master tx"); 770 return (IIC_ESTATUS); 771 } 772 773 if ((status & GLXIIC_SMB_STS_NEGACK_BIT) != 0) { 774 GLXIIC_DEBUG_LOG("slave nack in master tx"); 775 return (IIC_ENOACK); 776 } 777 778 if ((status & GLXIIC_SMB_STS_STASTR_BIT) != 0) { 779 bus_write_1(sc->smb_res, GLXIIC_SMB_STS, 780 GLXIIC_SMB_STS_STASTR_BIT); 781 } 782 783 if ((status & GLXIIC_SMB_STS_SDAST_BIT) == 0) { 784 GLXIIC_DEBUG_LOG("not awaiting data in master tx"); 785 return (IIC_ESTATUS); 786 } 787 788 bus_write_1(sc->smb_res, GLXIIC_SMB_SDA, *sc->data++); 789 if (--sc->ndata == 0) 790 glxiic_set_state_locked(sc, GLXIIC_STATE_MASTER_STOP); 791 else 792 glxiic_start_timeout_locked(sc); 793 794 return (IIC_NOERR); 795} 796 797static int 798glxiic_state_master_rx_callback(struct glxiic_softc *sc, uint8_t status) 799{ 800 uint8_t ctrl1; 801 802 GLXIIC_ASSERT_LOCKED(sc); 803 804 if ((status & GLXIIC_SMB_STS_BER_BIT) != 0) { 805 GLXIIC_DEBUG_LOG("bus error in master rx"); 806 return (IIC_EBUSERR); 807 } 808 809 if ((status & GLXIIC_SMB_STS_MASTER_BIT) == 0) { 810 GLXIIC_DEBUG_LOG("not bus master in master rx"); 811 return (IIC_ESTATUS); 812 } 813 814 if ((status & GLXIIC_SMB_STS_NEGACK_BIT) != 0) { 815 GLXIIC_DEBUG_LOG("slave nack in rx"); 816 return (IIC_ENOACK); 817 } 818 819 if ((status & GLXIIC_SMB_STS_STASTR_BIT) != 0) { 820 /* Bus is stalled, clear and wait for data. */ 821 bus_write_1(sc->smb_res, GLXIIC_SMB_STS, 822 GLXIIC_SMB_STS_STASTR_BIT); 823 return (IIC_NOERR); 824 } 825 826 if ((status & GLXIIC_SMB_STS_SDAST_BIT) == 0) { 827 GLXIIC_DEBUG_LOG("no pending data in master rx"); 828 return (IIC_ESTATUS); 829 } 830 831 *sc->data++ = bus_read_1(sc->smb_res, GLXIIC_SMB_SDA); 832 if (--sc->ndata == 0) { 833 /* Proceed with stop on reading last byte. */ 834 glxiic_set_state_locked(sc, GLXIIC_STATE_MASTER_STOP); 835 return (glxiic_state_table[sc->state].callback(sc, status)); 836 } 837 838 if (sc->ndata == 1) { 839 /* Last byte from slave, set NACK. */ 840 ctrl1 = bus_read_1(sc->smb_res, GLXIIC_SMB_CTRL1); 841 bus_write_1(sc->smb_res, GLXIIC_SMB_CTRL1, 842 ctrl1 | GLXIIC_SMB_CTRL1_ACK_BIT); 843 } 844 845 glxiic_start_timeout_locked(sc); 846 847 return (IIC_NOERR); 848} 849 850static int 851glxiic_state_master_stop_callback(struct glxiic_softc *sc, uint8_t status) 852{ 853 uint8_t ctrl1; 854 855 GLXIIC_ASSERT_LOCKED(sc); 856 857 if ((status & GLXIIC_SMB_STS_BER_BIT) != 0) { 858 GLXIIC_DEBUG_LOG("bus error in master stop"); 859 return (IIC_EBUSERR); 860 } 861 862 if ((status & GLXIIC_SMB_STS_MASTER_BIT) == 0) { 863 GLXIIC_DEBUG_LOG("not bus master in master stop"); 864 return (IIC_ESTATUS); 865 } 866 867 if ((status & GLXIIC_SMB_STS_NEGACK_BIT) != 0) { 868 GLXIIC_DEBUG_LOG("slave nack in master stop"); 869 return (IIC_ENOACK); 870 } 871 872 if (--sc->nmsgs > 0) { 873 /* Start transfer of next message. */ 874 if ((sc->msg->flags & IIC_M_NOSTOP) == 0) { 875 glxiic_stop_locked(sc); 876 } 877 878 ctrl1 = bus_read_1(sc->smb_res, GLXIIC_SMB_CTRL1); 879 bus_write_1(sc->smb_res, GLXIIC_SMB_CTRL1, 880 ctrl1 | GLXIIC_SMB_CTRL1_START_BIT); 881 882 glxiic_set_state_locked(sc, GLXIIC_STATE_MASTER_ADDR); 883 sc->msg++; 884 } else { 885 /* Last message. */ 886 glxiic_stop_locked(sc); 887 glxiic_set_state_locked(sc, GLXIIC_STATE_IDLE); 888 sc->error = IIC_NOERR; 889 GLXIIC_WAKEUP(sc); 890 } 891 892 return (IIC_NOERR); 893} 894 895static void 896glxiic_intr(void *arg) 897{ 898 struct glxiic_softc *sc; 899 int error; 900 uint8_t status, data; 901 902 sc = (struct glxiic_softc *)arg; 903 904 GLXIIC_LOCK(sc); 905 906 status = glxiic_read_status_locked(sc); 907 908 /* Check if this interrupt originated from the SMBus. */ 909 if ((status & 910 ~(GLXIIC_SMB_STS_MASTER_BIT | GLXIIC_SMB_STS_XMIT_BIT)) != 0) { 911 912 error = glxiic_state_table[sc->state].callback(sc, status); 913 914 if (error != IIC_NOERR) { 915 if (glxiic_state_table[sc->state].master) { 916 glxiic_stop_locked(sc); 917 glxiic_set_state_locked(sc, GLXIIC_STATE_IDLE); 918 sc->error = error; 919 GLXIIC_WAKEUP(sc); 920 } else { 921 data = error & 0xff; 922 iicbus_intr(sc->iicbus, INTR_ERROR, &data); 923 glxiic_set_state_locked(sc, GLXIIC_STATE_IDLE); 924 } 925 } 926 } 927 928 GLXIIC_UNLOCK(sc); 929} 930 931static int 932glxiic_reset(device_t dev, u_char speed, u_char addr, u_char *oldaddr) 933{ 934 struct glxiic_softc *sc; 935 936 sc = device_get_softc(dev); 937 938 GLXIIC_LOCK(sc); 939 940 if (oldaddr != NULL) 941 *oldaddr = sc->addr; 942 sc->addr = addr; 943 944 /* A disable/enable cycle resets the controller. */ 945 glxiic_smb_disable(sc); 946 glxiic_smb_enable(sc, speed, addr); 947 948 if (glxiic_state_table[sc->state].master) { 949 sc->error = IIC_ESTATUS; 950 GLXIIC_WAKEUP(sc); 951 } 952 glxiic_set_state_locked(sc, GLXIIC_STATE_IDLE); 953 954 GLXIIC_UNLOCK(sc); 955 956 return (IIC_NOERR); 957} 958 959static int 960glxiic_transfer(device_t dev, struct iic_msg *msgs, uint32_t nmsgs) 961{ 962 struct glxiic_softc *sc; 963 int error; 964 uint8_t ctrl1; 965 966 sc = device_get_softc(dev); 967 968 GLXIIC_LOCK(sc); 969 970 if (sc->state != GLXIIC_STATE_IDLE) { 971 error = IIC_EBUSBSY; 972 goto out; 973 } 974 975 sc->msg = msgs; 976 sc->nmsgs = nmsgs; 977 glxiic_set_state_locked(sc, GLXIIC_STATE_MASTER_ADDR); 978 979 /* Set start bit and let glxiic_intr() handle the transfer. */ 980 ctrl1 = bus_read_1(sc->smb_res, GLXIIC_SMB_CTRL1); 981 bus_write_1(sc->smb_res, GLXIIC_SMB_CTRL1, 982 ctrl1 | GLXIIC_SMB_CTRL1_START_BIT); 983 984 GLXIIC_SLEEP(sc); 985 error = sc->error; 986out: 987 GLXIIC_UNLOCK(sc); 988 989 return (error); 990} 991 992static void 993glxiic_smb_map_interrupt(int irq) 994{ 995 uint32_t irq_map; 996 int old_irq; 997 998 /* Protect the read-modify-write operation. */ 999 critical_enter(); 1000 1001 irq_map = rdmsr(GLXIIC_MSR_PIC_YSEL_HIGH); 1002 old_irq = GLXIIC_MAP_TO_SMB_IRQ(irq_map); 1003 1004 if (irq != old_irq) { 1005 irq_map &= ~GLXIIC_SMB_IRQ_TO_MAP(old_irq); 1006 irq_map |= GLXIIC_SMB_IRQ_TO_MAP(irq); 1007 wrmsr(GLXIIC_MSR_PIC_YSEL_HIGH, irq_map); 1008 } 1009 1010 critical_exit(); 1011} 1012 1013static void 1014glxiic_gpio_enable(struct glxiic_softc *sc) 1015{ 1016 1017 bus_write_4(sc->gpio_res, GLXIIC_GPIOL_IN_AUX1_SEL, 1018 GLXIIC_GPIO_14_15_ENABLE); 1019 bus_write_4(sc->gpio_res, GLXIIC_GPIOL_OUT_AUX1_SEL, 1020 GLXIIC_GPIO_14_15_ENABLE); 1021} 1022 1023static void 1024glxiic_gpio_disable(struct glxiic_softc *sc) 1025{ 1026 1027 bus_write_4(sc->gpio_res, GLXIIC_GPIOL_OUT_AUX1_SEL, 1028 GLXIIC_GPIO_14_15_DISABLE); 1029 bus_write_4(sc->gpio_res, GLXIIC_GPIOL_IN_AUX1_SEL, 1030 GLXIIC_GPIO_14_15_DISABLE); 1031} 1032 1033static void 1034glxiic_smb_enable(struct glxiic_softc *sc, uint8_t speed, uint8_t addr) 1035{ 1036 uint8_t ctrl1; 1037 1038 ctrl1 = 0; 1039 1040 switch (speed) { 1041 case IIC_SLOW: 1042 sc->sclfrq = GLXIIC_SLOW; 1043 break; 1044 case IIC_FAST: 1045 sc->sclfrq = GLXIIC_FAST; 1046 break; 1047 case IIC_FASTEST: 1048 sc->sclfrq = GLXIIC_FASTEST; 1049 break; 1050 case IIC_UNKNOWN: 1051 default: 1052 /* Reuse last frequency. */ 1053 break; 1054 } 1055 1056 /* Set bus speed and enable controller. */ 1057 bus_write_2(sc->smb_res, GLXIIC_SMB_CTRL2, 1058 GLXIIC_SCLFRQ(sc->sclfrq) | GLXIIC_SMB_CTRL2_EN_BIT); 1059 1060 if (addr != 0) { 1061 /* Enable new match and global call match interrupts. */ 1062 ctrl1 |= GLXIIC_SMB_CTRL1_NMINTE_BIT | 1063 GLXIIC_SMB_CTRL1_GCMEN_BIT; 1064 bus_write_1(sc->smb_res, GLXIIC_SMB_ADDR, 1065 GLXIIC_SMB_ADDR_SAEN_BIT | GLXIIC_SMBADDR(addr)); 1066 } else { 1067 bus_write_1(sc->smb_res, GLXIIC_SMB_ADDR, 0); 1068 } 1069 1070 /* Enable stall after start and interrupt. */ 1071 bus_write_1(sc->smb_res, GLXIIC_SMB_CTRL1, 1072 ctrl1 | GLXIIC_SMB_CTRL1_STASTRE_BIT | GLXIIC_SMB_CTRL1_INTEN_BIT); 1073} 1074 1075static void 1076glxiic_smb_disable(struct glxiic_softc *sc) 1077{ 1078 uint16_t sclfrq; 1079 1080 sclfrq = bus_read_2(sc->smb_res, GLXIIC_SMB_CTRL2); 1081 bus_write_2(sc->smb_res, GLXIIC_SMB_CTRL2, 1082 sclfrq & ~GLXIIC_SMB_CTRL2_EN_BIT); 1083} 1084