1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
36  * The driver is implemented as an interrupt-driven state machine,
37  * supporting both master and slave mode.
63 /* CS5536 PCI-ISA ID. */
146 	struct iic_msg	*msg;		/* Current master mode message. */
148 	uint8_t		*data;		/* Current master mode data byte. */
150 	int		 error;		/* Last master mode error. */
168 #define	GLXIIC_LOCK(_sc)		mtx_lock(&_sc->mtx)
169 #define	GLXIIC_UNLOCK(_sc)		mtx_unlock(&_sc->mtx)
171 	mtx_init(&_sc->mtx, device_get_nameunit(_sc->dev), "glxiic", MTX_DEF)
173 	mtx_sleep(_sc, &_sc->mtx, IICPRI, "glxiic", 0)
175 #define	GLXIIC_LOCK_DESTROY(_sc)	mtx_destroy(&_sc->mtx);
176 #define	GLXIIC_ASSERT_LOCKED(_sc)	mtx_assert(&_sc->mtx, MA_OWNED);
191 	boolean_t master;  member
198 		.master = FALSE,
203 		.master = FALSE,
208 		.master = FALSE,
213 		.master = TRUE,
218 		.master = TRUE,
223 		.master = TRUE,
228 		.master = TRUE,
287 	if (device_find_child(parent, driver->name, DEVICE_UNIT_ANY) != NULL)  in glxiic_identify()
291 		if (device_add_child(parent, driver->name, DEVICE_UNIT_ANY) == NULL)  in glxiic_identify()
318 	sc->dev = dev;  in glxiic_attach()
319 	sc->state = GLXIIC_STATE_IDLE;  in glxiic_attach()
323 	callout_init_mtx(&sc->callout, &sc->mtx, 0);  in glxiic_attach()
325 	sc->smb_rid = PCIR_BAR(0);  in glxiic_attach()
326 	sc->smb_res = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &sc->smb_rid,  in glxiic_attach()
328 	if (sc->smb_res == NULL) {  in glxiic_attach()
334 	sc->gpio_rid = PCIR_BAR(1);  in glxiic_attach()
335 	sc->gpio_res = bus_alloc_resource_any(dev, SYS_RES_IOPORT,  in glxiic_attach()
336 	    &sc->gpio_rid, RF_SHAREABLE | RF_ACTIVE);  in glxiic_attach()
337 	if (sc->gpio_res == NULL) {  in glxiic_attach()
348 	sc->old_irq = GLXIIC_MAP_TO_SMB_IRQ(irq_map);  in glxiic_attach()
361 	} else if (sc->old_irq != 0) {  in glxiic_attach()
365 		irq = sc->old_irq;  in glxiic_attach()
376 	sc->irq_rid = 0;  in glxiic_attach()
377 	sc->irq_res = bus_alloc_resource(dev, SYS_RES_IRQ, &sc->irq_rid,  in glxiic_attach()
379 	if (sc->irq_res == NULL) {  in glxiic_attach()
385 	error = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC | INTR_MPSAFE,  in glxiic_attach()
386 	    NULL, glxiic_intr, sc, &(sc->irq_handler));  in glxiic_attach()
393 	if ((sc->iicbus = device_add_child(dev, "iicbus",  in glxiic_attach()
403 	sc->timeout = GLXIIC_DEFAULT_TIMEOUT;  in glxiic_attach()
405 	    "timeout", CTLFLAG_RWTUN, &sc->timeout, 0,  in glxiic_attach()
416 		callout_drain(&sc->callout);  in glxiic_attach()
418 		if (sc->iicbus != NULL)  in glxiic_attach()
419 			device_delete_child(dev, sc->iicbus);  in glxiic_attach()
420 		if (sc->smb_res != NULL) {  in glxiic_attach()
422 			bus_release_resource(dev, SYS_RES_IOPORT, sc->smb_rid,  in glxiic_attach()
423 			    sc->smb_res);  in glxiic_attach()
425 		if (sc->gpio_res != NULL) {  in glxiic_attach()
427 			bus_release_resource(dev, SYS_RES_IOPORT, sc->gpio_rid,  in glxiic_attach()
428 			    sc->gpio_res);  in glxiic_attach()
430 		if (sc->irq_handler != NULL)  in glxiic_attach()
431 			bus_teardown_intr(dev, sc->irq_res, sc->irq_handler);  in glxiic_attach()
432 		if (sc->irq_res != NULL)  in glxiic_attach()
433 			bus_release_resource(dev, SYS_RES_IRQ, sc->irq_rid,  in glxiic_attach()
434 			    sc->irq_res);  in glxiic_attach()
437 		glxiic_smb_map_interrupt(sc->old_irq);  in glxiic_attach()
457 	callout_drain(&sc->callout);  in glxiic_detach()
459 	if (sc->smb_res != NULL) {  in glxiic_detach()
461 		bus_release_resource(dev, SYS_RES_IOPORT, sc->smb_rid,  in glxiic_detach()
462 		    sc->smb_res);  in glxiic_detach()
464 	if (sc->gpio_res != NULL) {  in glxiic_detach()
466 		bus_release_resource(dev, SYS_RES_IOPORT, sc->gpio_rid,  in glxiic_detach()
467 		    sc->gpio_res);  in glxiic_detach()
469 	if (sc->irq_handler != NULL)  in glxiic_detach()
470 		bus_teardown_intr(dev, sc->irq_res, sc->irq_handler);  in glxiic_detach()
471 	if (sc->irq_res != NULL)  in glxiic_detach()
472 		bus_release_resource(dev, SYS_RES_IRQ, sc->irq_rid,  in glxiic_detach()
473 		    sc->irq_res);  in glxiic_detach()
476 	glxiic_smb_map_interrupt(sc->old_irq);  in glxiic_detach()
490 	status = bus_read_1(sc->smb_res, GLXIIC_SMB_STS);  in glxiic_read_status_locked()
493 	bus_write_1(sc->smb_res, GLXIIC_SMB_STS, (GLXIIC_SMB_STS_SLVSTP_BIT |  in glxiic_read_status_locked()
509 	ctrl1 = bus_read_1(sc->smb_res, GLXIIC_SMB_CTRL1);  in glxiic_stop_locked()
510 	bus_write_1(sc->smb_res, GLXIIC_SMB_CTRL1,  in glxiic_stop_locked()
514 	 * Perform a dummy read of SDA in master receive mode to clear  in glxiic_stop_locked()
519 	 	bus_read_1(sc->smb_res, GLXIIC_SMB_SDA);  in glxiic_stop_locked()
523 		bus_write_1(sc->smb_res, GLXIIC_SMB_STS,  in glxiic_stop_locked()
536 	GLXIIC_DEBUG_LOG("timeout in state %d", sc->state);  in glxiic_timeout()
538 	if (glxiic_state_table[sc->state].master) {  in glxiic_timeout()
539 		sc->error = IIC_ETIMEOUT;  in glxiic_timeout()
543 		iicbus_intr(sc->iicbus, INTR_ERROR, &error);  in glxiic_timeout()
547 	glxiic_smb_enable(sc, IIC_UNKNOWN, sc->addr);  in glxiic_timeout()
557 	callout_reset_sbt(&sc->callout, SBT_1MS * sc->timeout, 0,  in glxiic_start_timeout_locked()
568 		callout_stop(&sc->callout);  in glxiic_set_state_locked()
569 	else if (sc->timeout > 0)  in glxiic_set_state_locked()
572 	sc->state = state;  in glxiic_set_state_locked()
582 	ctrl_sts = bus_read_1(sc->smb_res, GLXIIC_SMB_CTRL_STS);  in glxiic_handle_slave_match_locked()
586 			addr = sc->addr | LSB;  in glxiic_handle_slave_match_locked()
590 			addr = sc->addr & ~LSB;  in glxiic_handle_slave_match_locked()
594 		iicbus_intr(sc->iicbus, INTR_START, &addr);  in glxiic_handle_slave_match_locked()
598 		iicbus_intr(sc->iicbus, INTR_GENERAL, &addr);  in glxiic_handle_slave_match_locked()
638 		iicbus_intr(sc->iicbus, INTR_STOP, NULL);  in glxiic_state_slave_tx_callback()
644 		iicbus_intr(sc->iicbus, INTR_NOACK, NULL);  in glxiic_state_slave_tx_callback()
649 		/* Handle repeated start in slave mode. */  in glxiic_state_slave_tx_callback()
658 	iicbus_intr(sc->iicbus, INTR_TRANSMIT, &data);  in glxiic_state_slave_tx_callback()
659 	bus_write_1(sc->smb_res, GLXIIC_SMB_SDA, data);  in glxiic_state_slave_tx_callback()
679 		iicbus_intr(sc->iicbus, INTR_STOP, NULL);  in glxiic_state_slave_rx_callback()
685 		/* Handle repeated start in slave mode. */  in glxiic_state_slave_rx_callback()
694 	data = bus_read_1(sc->smb_res, GLXIIC_SMB_SDA);  in glxiic_state_slave_rx_callback()
695 	iicbus_intr(sc->iicbus, INTR_RECEIVE, &data);  in glxiic_state_slave_rx_callback()
711 		GLXIIC_DEBUG_LOG("bus error after master start");  in glxiic_state_master_addr_callback()
716 		GLXIIC_DEBUG_LOG("not bus master after master start");  in glxiic_state_master_addr_callback()
721 		GLXIIC_DEBUG_LOG("not awaiting address in master addr");  in glxiic_state_master_addr_callback()
725 	if ((sc->msg->flags & IIC_M_RD) != 0) {  in glxiic_state_master_addr_callback()
726 		slave = sc->msg->slave | LSB;  in glxiic_state_master_addr_callback()
729 		slave = sc->msg->slave & ~LSB;  in glxiic_state_master_addr_callback()
733 	sc->data = sc->msg->buf;  in glxiic_state_master_addr_callback()
734 	sc->ndata = sc->msg->len;  in glxiic_state_master_addr_callback()
736 	/* Handle address-only transfer. */  in glxiic_state_master_addr_callback()
737 	if (sc->ndata == 0)  in glxiic_state_master_addr_callback()
740 	bus_write_1(sc->smb_res, GLXIIC_SMB_SDA, slave);  in glxiic_state_master_addr_callback()
742 	if ((sc->msg->flags & IIC_M_RD) != 0 && sc->ndata == 1) {  in glxiic_state_master_addr_callback()
744 		ctrl1 = bus_read_1(sc->smb_res, GLXIIC_SMB_CTRL1);  in glxiic_state_master_addr_callback()
745 		bus_write_1(sc->smb_res, GLXIIC_SMB_CTRL1,  in glxiic_state_master_addr_callback()
759 		GLXIIC_DEBUG_LOG("bus error in master tx");  in glxiic_state_master_tx_callback()
764 		GLXIIC_DEBUG_LOG("not bus master in master tx");  in glxiic_state_master_tx_callback()
769 		GLXIIC_DEBUG_LOG("slave nack in master tx");  in glxiic_state_master_tx_callback()
774 		bus_write_1(sc->smb_res, GLXIIC_SMB_STS,  in glxiic_state_master_tx_callback()
779 		GLXIIC_DEBUG_LOG("not awaiting data in master tx");  in glxiic_state_master_tx_callback()
783 	bus_write_1(sc->smb_res, GLXIIC_SMB_SDA, *sc->data++);  in glxiic_state_master_tx_callback()
784 	if (--sc->ndata == 0)  in glxiic_state_master_tx_callback()
800 		GLXIIC_DEBUG_LOG("bus error in master rx");  in glxiic_state_master_rx_callback()
805 		GLXIIC_DEBUG_LOG("not bus master in master rx");  in glxiic_state_master_rx_callback()
816 		bus_write_1(sc->smb_res, GLXIIC_SMB_STS,  in glxiic_state_master_rx_callback()
822 		GLXIIC_DEBUG_LOG("no pending data in master rx");  in glxiic_state_master_rx_callback()
826 	*sc->data++ = bus_read_1(sc->smb_res, GLXIIC_SMB_SDA);  in glxiic_state_master_rx_callback()
827 	if (--sc->ndata == 0) {  in glxiic_state_master_rx_callback()
830 		return (glxiic_state_table[sc->state].callback(sc, status));  in glxiic_state_master_rx_callback()
833 	if (sc->ndata == 1) {  in glxiic_state_master_rx_callback()
835 		ctrl1 = bus_read_1(sc->smb_res, GLXIIC_SMB_CTRL1);  in glxiic_state_master_rx_callback()
836 		bus_write_1(sc->smb_res, GLXIIC_SMB_CTRL1,  in glxiic_state_master_rx_callback()
853 		GLXIIC_DEBUG_LOG("bus error in master stop");  in glxiic_state_master_stop_callback()
858 		GLXIIC_DEBUG_LOG("not bus master in master stop");  in glxiic_state_master_stop_callback()
863 		GLXIIC_DEBUG_LOG("slave nack in master stop");  in glxiic_state_master_stop_callback()
867 	if (--sc->nmsgs > 0) {  in glxiic_state_master_stop_callback()
869 		if ((sc->msg->flags & IIC_M_NOSTOP) == 0) {  in glxiic_state_master_stop_callback()
873 		ctrl1 = bus_read_1(sc->smb_res, GLXIIC_SMB_CTRL1);  in glxiic_state_master_stop_callback()
874 		bus_write_1(sc->smb_res, GLXIIC_SMB_CTRL1,  in glxiic_state_master_stop_callback()
878 		sc->msg++;  in glxiic_state_master_stop_callback()
883 		sc->error = IIC_NOERR;  in glxiic_state_master_stop_callback()
907 		error = glxiic_state_table[sc->state].callback(sc, status);  in glxiic_intr()
910 			if (glxiic_state_table[sc->state].master) {  in glxiic_intr()
913 				sc->error = error;  in glxiic_intr()
917 				iicbus_intr(sc->iicbus, INTR_ERROR, &data);  in glxiic_intr()
936 		*oldaddr = sc->addr;  in glxiic_reset()
937 	sc->addr = addr;  in glxiic_reset()
943 	if (glxiic_state_table[sc->state].master) {  in glxiic_reset()
944 		sc->error = IIC_ESTATUS;  in glxiic_reset()
965 	if (sc->state != GLXIIC_STATE_IDLE) {  in glxiic_transfer()
970 	sc->msg = msgs;  in glxiic_transfer()
971 	sc->nmsgs = nmsgs;  in glxiic_transfer()
975 	ctrl1 = bus_read_1(sc->smb_res, GLXIIC_SMB_CTRL1);  in glxiic_transfer()
976 	bus_write_1(sc->smb_res, GLXIIC_SMB_CTRL1,  in glxiic_transfer()
980 	error = sc->error;  in glxiic_transfer()
993 	/* Protect the read-modify-write operation. */  in glxiic_smb_map_interrupt()
1012 	bus_write_4(sc->gpio_res, GLXIIC_GPIOL_IN_AUX1_SEL,  in glxiic_gpio_enable()
1014 	bus_write_4(sc->gpio_res, GLXIIC_GPIOL_OUT_AUX1_SEL,  in glxiic_gpio_enable()
1022 	bus_write_4(sc->gpio_res, GLXIIC_GPIOL_OUT_AUX1_SEL,  in glxiic_gpio_disable()
1024 	bus_write_4(sc->gpio_res, GLXIIC_GPIOL_IN_AUX1_SEL,  in glxiic_gpio_disable()
1037 		sc->sclfrq = GLXIIC_SLOW;  in glxiic_smb_enable()
1040 		sc->sclfrq = GLXIIC_FAST;  in glxiic_smb_enable()
1043 		sc->sclfrq = GLXIIC_FASTEST;  in glxiic_smb_enable()
1052 	bus_write_2(sc->smb_res, GLXIIC_SMB_CTRL2,  in glxiic_smb_enable()
1053 	    GLXIIC_SCLFRQ(sc->sclfrq) | GLXIIC_SMB_CTRL2_EN_BIT);  in glxiic_smb_enable()
1059 		bus_write_1(sc->smb_res, GLXIIC_SMB_ADDR,  in glxiic_smb_enable()
1062 		bus_write_1(sc->smb_res, GLXIIC_SMB_ADDR, 0);  in glxiic_smb_enable()
1066 	bus_write_1(sc->smb_res, GLXIIC_SMB_CTRL1,  in glxiic_smb_enable()
1075 	sclfrq = bus_read_2(sc->smb_res, GLXIIC_SMB_CTRL2);  in glxiic_smb_disable()
1076 	bus_write_2(sc->smb_res, GLXIIC_SMB_CTRL2,  in glxiic_smb_disable()