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);
287 	if (device_find_child(parent, driver->name, -1) != NULL)  in glxiic_identify()
291 		if (device_add_child(parent, driver->name, -1) == 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", -1)) == NULL) {  in glxiic_attach()
402 	sc->timeout = GLXIIC_DEFAULT_TIMEOUT;  in glxiic_attach()
404 	    "timeout", CTLFLAG_RWTUN, &sc->timeout, 0,  in glxiic_attach()
415 		callout_drain(&sc->callout);  in glxiic_attach()
417 		if (sc->iicbus != NULL)  in glxiic_attach()
418 			device_delete_child(dev, sc->iicbus);  in glxiic_attach()
419 		if (sc->smb_res != NULL) {  in glxiic_attach()
421 			bus_release_resource(dev, SYS_RES_IOPORT, sc->smb_rid,  in glxiic_attach()
422 			    sc->smb_res);  in glxiic_attach()
424 		if (sc->gpio_res != NULL) {  in glxiic_attach()
426 			bus_release_resource(dev, SYS_RES_IOPORT, sc->gpio_rid,  in glxiic_attach()
427 			    sc->gpio_res);  in glxiic_attach()
429 		if (sc->irq_handler != NULL)  in glxiic_attach()
430 			bus_teardown_intr(dev, sc->irq_res, sc->irq_handler);  in glxiic_attach()
431 		if (sc->irq_res != NULL)  in glxiic_attach()
432 			bus_release_resource(dev, SYS_RES_IRQ, sc->irq_rid,  in glxiic_attach()
433 			    sc->irq_res);  in glxiic_attach()
436 		glxiic_smb_map_interrupt(sc->old_irq);  in glxiic_attach()
455 	if (sc->iicbus != NULL)  in glxiic_detach()
456 		error = device_delete_child(dev, sc->iicbus);  in glxiic_detach()
459 	callout_drain(&sc->callout);  in glxiic_detach()
461 	if (sc->smb_res != NULL) {  in glxiic_detach()
463 		bus_release_resource(dev, SYS_RES_IOPORT, sc->smb_rid,  in glxiic_detach()
464 		    sc->smb_res);  in glxiic_detach()
466 	if (sc->gpio_res != NULL) {  in glxiic_detach()
468 		bus_release_resource(dev, SYS_RES_IOPORT, sc->gpio_rid,  in glxiic_detach()
469 		    sc->gpio_res);  in glxiic_detach()
471 	if (sc->irq_handler != NULL)  in glxiic_detach()
472 		bus_teardown_intr(dev, sc->irq_res, sc->irq_handler);  in glxiic_detach()
473 	if (sc->irq_res != NULL)  in glxiic_detach()
474 		bus_release_resource(dev, SYS_RES_IRQ, sc->irq_rid,  in glxiic_detach()
475 		    sc->irq_res);  in glxiic_detach()
478 	glxiic_smb_map_interrupt(sc->old_irq);  in glxiic_detach()
492 	status = bus_read_1(sc->smb_res, GLXIIC_SMB_STS);  in glxiic_read_status_locked()
495 	bus_write_1(sc->smb_res, GLXIIC_SMB_STS, (GLXIIC_SMB_STS_SLVSTP_BIT |  in glxiic_read_status_locked()
511 	ctrl1 = bus_read_1(sc->smb_res, GLXIIC_SMB_CTRL1);  in glxiic_stop_locked()
512 	bus_write_1(sc->smb_res, GLXIIC_SMB_CTRL1,  in glxiic_stop_locked()
516 	 * Perform a dummy read of SDA in master receive mode to clear  in glxiic_stop_locked()
521 	 	bus_read_1(sc->smb_res, GLXIIC_SMB_SDA);  in glxiic_stop_locked()
525 		bus_write_1(sc->smb_res, GLXIIC_SMB_STS,  in glxiic_stop_locked()
538 	GLXIIC_DEBUG_LOG("timeout in state %d", sc->state);  in glxiic_timeout()
540 	if (glxiic_state_table[sc->state].master) {  in glxiic_timeout()
541 		sc->error = IIC_ETIMEOUT;  in glxiic_timeout()
545 		iicbus_intr(sc->iicbus, INTR_ERROR, &error);  in glxiic_timeout()
549 	glxiic_smb_enable(sc, IIC_UNKNOWN, sc->addr);  in glxiic_timeout()
559 	callout_reset_sbt(&sc->callout, SBT_1MS * sc->timeout, 0,  in glxiic_start_timeout_locked()
570 		callout_stop(&sc->callout);  in glxiic_set_state_locked()
571 	else if (sc->timeout > 0)  in glxiic_set_state_locked()
574 	sc->state = state;  in glxiic_set_state_locked()
584 	ctrl_sts = bus_read_1(sc->smb_res, GLXIIC_SMB_CTRL_STS);  in glxiic_handle_slave_match_locked()
588 			addr = sc->addr | LSB;  in glxiic_handle_slave_match_locked()
592 			addr = sc->addr & ~LSB;  in glxiic_handle_slave_match_locked()
596 		iicbus_intr(sc->iicbus, INTR_START, &addr);  in glxiic_handle_slave_match_locked()
600 		iicbus_intr(sc->iicbus, INTR_GENERAL, &addr);  in glxiic_handle_slave_match_locked()
602 		GLXIIC_DEBUG_LOG("unknown slave match");  in glxiic_handle_slave_match_locked()
635 		GLXIIC_DEBUG_LOG("bus error in slave tx");  in glxiic_state_slave_tx_callback()
640 		iicbus_intr(sc->iicbus, INTR_STOP, NULL);  in glxiic_state_slave_tx_callback()
646 		iicbus_intr(sc->iicbus, INTR_NOACK, NULL);  in glxiic_state_slave_tx_callback()
651 		/* Handle repeated start in slave mode. */  in glxiic_state_slave_tx_callback()
656 		GLXIIC_DEBUG_LOG("not awaiting data in slave tx");  in glxiic_state_slave_tx_callback()
660 	iicbus_intr(sc->iicbus, INTR_TRANSMIT, &data);  in glxiic_state_slave_tx_callback()
661 	bus_write_1(sc->smb_res, GLXIIC_SMB_SDA, data);  in glxiic_state_slave_tx_callback()
676 		GLXIIC_DEBUG_LOG("bus error in slave rx");  in glxiic_state_slave_rx_callback()
681 		iicbus_intr(sc->iicbus, INTR_STOP, NULL);  in glxiic_state_slave_rx_callback()
687 		/* Handle repeated start in slave mode. */  in glxiic_state_slave_rx_callback()
692 		GLXIIC_DEBUG_LOG("no pending data in slave rx");  in glxiic_state_slave_rx_callback()
696 	data = bus_read_1(sc->smb_res, GLXIIC_SMB_SDA);  in glxiic_state_slave_rx_callback()
697 	iicbus_intr(sc->iicbus, INTR_RECEIVE, &data);  in glxiic_state_slave_rx_callback()
707 	uint8_t slave;  in glxiic_state_master_addr_callback()  local
727 	if ((sc->msg->flags & IIC_M_RD) != 0) {  in glxiic_state_master_addr_callback()
728 		slave = sc->msg->slave | LSB;  in glxiic_state_master_addr_callback()
731 		slave = sc->msg->slave & ~LSB;  in glxiic_state_master_addr_callback()
735 	sc->data = sc->msg->buf;  in glxiic_state_master_addr_callback()
736 	sc->ndata = sc->msg->len;  in glxiic_state_master_addr_callback()
738 	/* Handle address-only transfer. */  in glxiic_state_master_addr_callback()
739 	if (sc->ndata == 0)  in glxiic_state_master_addr_callback()
742 	bus_write_1(sc->smb_res, GLXIIC_SMB_SDA, slave);  in glxiic_state_master_addr_callback()
744 	if ((sc->msg->flags & IIC_M_RD) != 0 && sc->ndata == 1) {  in glxiic_state_master_addr_callback()
745 		/* Last byte from slave, set NACK. */  in glxiic_state_master_addr_callback()
746 		ctrl1 = bus_read_1(sc->smb_res, GLXIIC_SMB_CTRL1);  in glxiic_state_master_addr_callback()
747 		bus_write_1(sc->smb_res, GLXIIC_SMB_CTRL1,  in glxiic_state_master_addr_callback()
771 		GLXIIC_DEBUG_LOG("slave nack in master tx");  in glxiic_state_master_tx_callback()
776 		bus_write_1(sc->smb_res, GLXIIC_SMB_STS,  in glxiic_state_master_tx_callback()
785 	bus_write_1(sc->smb_res, GLXIIC_SMB_SDA, *sc->data++);  in glxiic_state_master_tx_callback()
786 	if (--sc->ndata == 0)  in glxiic_state_master_tx_callback()
812 		GLXIIC_DEBUG_LOG("slave nack in rx");  in glxiic_state_master_rx_callback()
818 		bus_write_1(sc->smb_res, GLXIIC_SMB_STS,  in glxiic_state_master_rx_callback()
828 	*sc->data++ = bus_read_1(sc->smb_res, GLXIIC_SMB_SDA);  in glxiic_state_master_rx_callback()
829 	if (--sc->ndata == 0) {  in glxiic_state_master_rx_callback()
832 		return (glxiic_state_table[sc->state].callback(sc, status));  in glxiic_state_master_rx_callback()
835 	if (sc->ndata == 1) {  in glxiic_state_master_rx_callback()
836 		/* Last byte from slave, set NACK. */  in glxiic_state_master_rx_callback()
837 		ctrl1 = bus_read_1(sc->smb_res, GLXIIC_SMB_CTRL1);  in glxiic_state_master_rx_callback()
838 		bus_write_1(sc->smb_res, GLXIIC_SMB_CTRL1,  in glxiic_state_master_rx_callback()
865 		GLXIIC_DEBUG_LOG("slave nack in master stop");  in glxiic_state_master_stop_callback()
869 	if (--sc->nmsgs > 0) {  in glxiic_state_master_stop_callback()
871 		if ((sc->msg->flags & IIC_M_NOSTOP) == 0) {  in glxiic_state_master_stop_callback()
875 		ctrl1 = bus_read_1(sc->smb_res, GLXIIC_SMB_CTRL1);  in glxiic_state_master_stop_callback()
876 		bus_write_1(sc->smb_res, GLXIIC_SMB_CTRL1,  in glxiic_state_master_stop_callback()
880 		sc->msg++;  in glxiic_state_master_stop_callback()
885 		sc->error = IIC_NOERR;  in glxiic_state_master_stop_callback()
909 		error = glxiic_state_table[sc->state].callback(sc, status);  in glxiic_intr()
912 			if (glxiic_state_table[sc->state].master) {  in glxiic_intr()
915 				sc->error = error;  in glxiic_intr()
919 				iicbus_intr(sc->iicbus, INTR_ERROR, &data);  in glxiic_intr()
938 		*oldaddr = sc->addr;  in glxiic_reset()
939 	sc->addr = addr;  in glxiic_reset()
945 	if (glxiic_state_table[sc->state].master) {  in glxiic_reset()
946 		sc->error = IIC_ESTATUS;  in glxiic_reset()
967 	if (sc->state != GLXIIC_STATE_IDLE) {  in glxiic_transfer()
972 	sc->msg = msgs;  in glxiic_transfer()
973 	sc->nmsgs = nmsgs;  in glxiic_transfer()
977 	ctrl1 = bus_read_1(sc->smb_res, GLXIIC_SMB_CTRL1);  in glxiic_transfer()
978 	bus_write_1(sc->smb_res, GLXIIC_SMB_CTRL1,  in glxiic_transfer()
982 	error = sc->error;  in glxiic_transfer()
995 	/* Protect the read-modify-write operation. */  in glxiic_smb_map_interrupt()
1014 	bus_write_4(sc->gpio_res, GLXIIC_GPIOL_IN_AUX1_SEL,  in glxiic_gpio_enable()
1016 	bus_write_4(sc->gpio_res, GLXIIC_GPIOL_OUT_AUX1_SEL,  in glxiic_gpio_enable()
1024 	bus_write_4(sc->gpio_res, GLXIIC_GPIOL_OUT_AUX1_SEL,  in glxiic_gpio_disable()
1026 	bus_write_4(sc->gpio_res, GLXIIC_GPIOL_IN_AUX1_SEL,  in glxiic_gpio_disable()
1039 		sc->sclfrq = GLXIIC_SLOW;  in glxiic_smb_enable()
1042 		sc->sclfrq = GLXIIC_FAST;  in glxiic_smb_enable()
1045 		sc->sclfrq = GLXIIC_FASTEST;  in glxiic_smb_enable()
1054 	bus_write_2(sc->smb_res, GLXIIC_SMB_CTRL2,  in glxiic_smb_enable()
1055 	    GLXIIC_SCLFRQ(sc->sclfrq) | GLXIIC_SMB_CTRL2_EN_BIT);  in glxiic_smb_enable()
1061 		bus_write_1(sc->smb_res, GLXIIC_SMB_ADDR,  in glxiic_smb_enable()
1064 		bus_write_1(sc->smb_res, GLXIIC_SMB_ADDR, 0);  in glxiic_smb_enable()
1068 	bus_write_1(sc->smb_res, GLXIIC_SMB_CTRL1,  in glxiic_smb_enable()
1077 	sclfrq = bus_read_2(sc->smb_res, GLXIIC_SMB_CTRL2);  in glxiic_smb_disable()
1078 	bus_write_2(sc->smb_res, GLXIIC_SMB_CTRL2,  in glxiic_smb_disable()