171 static int aspeed_i2c_reset(struct aspeed_i2c_bus *bus);
173 /* precondition: bus.lock has been acquired. */
174 static void aspeed_i2c_do_stop(struct aspeed_i2c_bus *bus)  in aspeed_i2c_do_stop()  argument
176 	bus->master_state = ASPEED_I2C_MASTER_STOP;  in aspeed_i2c_do_stop()
177 	writel(ASPEED_I2CD_M_STOP_CMD, bus->base + ASPEED_I2C_CMD_REG);  in aspeed_i2c_do_stop()
180 static int aspeed_i2c_recover_bus(struct aspeed_i2c_bus *bus)  in aspeed_i2c_recover_bus()  argument
186 	spin_lock_irqsave(&bus->lock, flags);  in aspeed_i2c_recover_bus()
187 	command = readl(bus->base + ASPEED_I2C_CMD_REG);  in aspeed_i2c_recover_bus()
190 		/* Bus is idle: no recovery needed. */  in aspeed_i2c_recover_bus()
193 		dev_dbg(bus->dev, "SCL hung (state %x), attempting recovery\n",  in aspeed_i2c_recover_bus()
196 		reinit_completion(&bus->cmd_complete);  in aspeed_i2c_recover_bus()
197 		aspeed_i2c_do_stop(bus);  in aspeed_i2c_recover_bus()
198 		spin_unlock_irqrestore(&bus->lock, flags);  in aspeed_i2c_recover_bus()
201 				&bus->cmd_complete, bus->adap.timeout);  in aspeed_i2c_recover_bus()
203 		spin_lock_irqsave(&bus->lock, flags);  in aspeed_i2c_recover_bus()
206 		else if (bus->cmd_err)  in aspeed_i2c_recover_bus()
209 		else if (!(readl(bus->base + ASPEED_I2C_CMD_REG) &  in aspeed_i2c_recover_bus()
212 	/* Bus error. */  in aspeed_i2c_recover_bus()
214 		dev_dbg(bus->dev, "SDA hung (state %x), attempting recovery\n",  in aspeed_i2c_recover_bus()
217 		reinit_completion(&bus->cmd_complete);  in aspeed_i2c_recover_bus()
220 		       bus->base + ASPEED_I2C_CMD_REG);  in aspeed_i2c_recover_bus()
221 		spin_unlock_irqrestore(&bus->lock, flags);  in aspeed_i2c_recover_bus()
224 				&bus->cmd_complete, bus->adap.timeout);  in aspeed_i2c_recover_bus()
226 		spin_lock_irqsave(&bus->lock, flags);  in aspeed_i2c_recover_bus()
229 		else if (bus->cmd_err)  in aspeed_i2c_recover_bus()
232 		else if (!(readl(bus->base + ASPEED_I2C_CMD_REG) &  in aspeed_i2c_recover_bus()
238 	spin_unlock_irqrestore(&bus->lock, flags);  in aspeed_i2c_recover_bus()
243 	spin_unlock_irqrestore(&bus->lock, flags);  in aspeed_i2c_recover_bus()
245 	return aspeed_i2c_reset(bus);  in aspeed_i2c_recover_bus()
249 static u32 aspeed_i2c_slave_irq(struct aspeed_i2c_bus *bus, u32 irq_status)  in aspeed_i2c_slave_irq()  argument
252 	struct i2c_client *slave = bus->slave;  in aspeed_i2c_slave_irq()
267 		bus->slave_state = ASPEED_I2C_SLAVE_STOP;  in aspeed_i2c_slave_irq()
271 	    bus->slave_state == ASPEED_I2C_SLAVE_READ_PROCESSED) {  in aspeed_i2c_slave_irq()
273 		bus->slave_state = ASPEED_I2C_SLAVE_STOP;  in aspeed_i2c_slave_irq()
277 	if (bus->slave_state == ASPEED_I2C_SLAVE_STOP) {  in aspeed_i2c_slave_irq()
279 		bus->slave_state = ASPEED_I2C_SLAVE_INACTIVE;  in aspeed_i2c_slave_irq()
288 		bus->slave_state = ASPEED_I2C_SLAVE_START;  in aspeed_i2c_slave_irq()
295 	if (bus->slave_state == ASPEED_I2C_SLAVE_INACTIVE)  in aspeed_i2c_slave_irq()
298 	command = readl(bus->base + ASPEED_I2C_CMD_REG);  in aspeed_i2c_slave_irq()
299 	dev_dbg(bus->dev, "slave irq status 0x%08x, cmd 0x%08x\n",  in aspeed_i2c_slave_irq()
304 		value = readl(bus->base + ASPEED_I2C_BYTE_BUF_REG) >> 8;  in aspeed_i2c_slave_irq()
306 		if (bus->slave_state == ASPEED_I2C_SLAVE_START) {  in aspeed_i2c_slave_irq()
308 				bus->slave_state =  in aspeed_i2c_slave_irq()
311 				bus->slave_state =  in aspeed_i2c_slave_irq()
317 	switch (bus->slave_state) {  in aspeed_i2c_slave_irq()
320 			dev_err(bus->dev, "Unexpected ACK on read request.\n");  in aspeed_i2c_slave_irq()
321 		bus->slave_state = ASPEED_I2C_SLAVE_READ_PROCESSED;  in aspeed_i2c_slave_irq()
323 		writel(value, bus->base + ASPEED_I2C_BYTE_BUF_REG);  in aspeed_i2c_slave_irq()
324 		writel(ASPEED_I2CD_S_TX_CMD, bus->base + ASPEED_I2C_CMD_REG);  in aspeed_i2c_slave_irq()
328 			dev_err(bus->dev,  in aspeed_i2c_slave_irq()
334 		writel(value, bus->base + ASPEED_I2C_BYTE_BUF_REG);  in aspeed_i2c_slave_irq()
335 		writel(ASPEED_I2CD_S_TX_CMD, bus->base + ASPEED_I2C_CMD_REG);  in aspeed_i2c_slave_irq()
338 		bus->slave_state = ASPEED_I2C_SLAVE_WRITE_RECEIVED;  in aspeed_i2c_slave_irq()
342 		 * returns an errno, the bus driver should nack the next incoming byte.  in aspeed_i2c_slave_irq()
345 			writel(ASPEED_I2CD_M_S_RX_CMD_LAST, bus->base + ASPEED_I2C_CMD_REG);  in aspeed_i2c_slave_irq()
357 		dev_err(bus->dev, "unknown slave_state: %d\n",  in aspeed_i2c_slave_irq()
358 			bus->slave_state);  in aspeed_i2c_slave_irq()
359 		bus->slave_state = ASPEED_I2C_SLAVE_INACTIVE;  in aspeed_i2c_slave_irq()
367 /* precondition: bus.lock has been acquired. */
368 static void aspeed_i2c_do_start(struct aspeed_i2c_bus *bus)  in aspeed_i2c_do_start()  argument
371 	struct i2c_msg *msg = &bus->msgs[bus->msgs_index];  in aspeed_i2c_do_start()
378 	 * command when the bus comes back to the idle state.  in aspeed_i2c_do_start()
380 	if (bus->slave_state != ASPEED_I2C_SLAVE_INACTIVE) {  in aspeed_i2c_do_start()
381 		bus->master_state = ASPEED_I2C_MASTER_PENDING;  in aspeed_i2c_do_start()
386 	bus->master_state = ASPEED_I2C_MASTER_START;  in aspeed_i2c_do_start()
387 	bus->buf_index = 0;  in aspeed_i2c_do_start()
396 	writel(slave_addr, bus->base + ASPEED_I2C_BYTE_BUF_REG);  in aspeed_i2c_do_start()
397 	writel(command, bus->base + ASPEED_I2C_CMD_REG);  in aspeed_i2c_do_start()
400 /* precondition: bus.lock has been acquired. */
401 static void aspeed_i2c_next_msg_or_stop(struct aspeed_i2c_bus *bus)  in aspeed_i2c_next_msg_or_stop()  argument
403 	if (bus->msgs_index + 1 < bus->msgs_count) {  in aspeed_i2c_next_msg_or_stop()
404 		bus->msgs_index++;  in aspeed_i2c_next_msg_or_stop()
405 		aspeed_i2c_do_start(bus);  in aspeed_i2c_next_msg_or_stop()
407 		aspeed_i2c_do_stop(bus);  in aspeed_i2c_next_msg_or_stop()
424 static u32 aspeed_i2c_master_irq(struct aspeed_i2c_bus *bus, u32 irq_status)  in aspeed_i2c_master_irq()  argument
432 		bus->master_state = ASPEED_I2C_MASTER_INACTIVE;  in aspeed_i2c_master_irq()
444 		dev_dbg(bus->dev, "received error interrupt: 0x%08x\n",  in aspeed_i2c_master_irq()
447 		if (bus->master_state != ASPEED_I2C_MASTER_INACTIVE) {  in aspeed_i2c_master_irq()
449 			bus->cmd_err = ret;  in aspeed_i2c_master_irq()
450 			bus->master_state = ASPEED_I2C_MASTER_INACTIVE;  in aspeed_i2c_master_irq()
456 	if (bus->master_state == ASPEED_I2C_MASTER_INACTIVE ||  in aspeed_i2c_master_irq()
457 	    bus->master_state == ASPEED_I2C_MASTER_PENDING)  in aspeed_i2c_master_irq()
460 	/* We are in an invalid state; reset bus to a known state. */  in aspeed_i2c_master_irq()
461 	if (!bus->msgs) {  in aspeed_i2c_master_irq()
462 		dev_err(bus->dev, "bus in unknown state. irq_status: 0x%x\n",  in aspeed_i2c_master_irq()
464 		bus->cmd_err = -EIO;  in aspeed_i2c_master_irq()
465 		if (bus->master_state != ASPEED_I2C_MASTER_STOP &&  in aspeed_i2c_master_irq()
466 		    bus->master_state != ASPEED_I2C_MASTER_INACTIVE)  in aspeed_i2c_master_irq()
467 			aspeed_i2c_do_stop(bus);  in aspeed_i2c_master_irq()
470 	msg = &bus->msgs[bus->msgs_index];  in aspeed_i2c_master_irq()
477 	if (bus->master_state == ASPEED_I2C_MASTER_START) {  in aspeed_i2c_master_irq()
487 			writel(readl(bus->base + ASPEED_I2C_CMD_REG) &  in aspeed_i2c_master_irq()
489 			       bus->base + ASPEED_I2C_CMD_REG);  in aspeed_i2c_master_irq()
490 			bus->master_state = ASPEED_I2C_MASTER_PENDING;  in aspeed_i2c_master_irq()
491 			dev_dbg(bus->dev,  in aspeed_i2c_master_irq()
498 				bus->cmd_err = -ENXIO;  in aspeed_i2c_master_irq()
499 				bus->master_state = ASPEED_I2C_MASTER_INACTIVE;  in aspeed_i2c_master_irq()
504 			bus->cmd_err = -ENXIO;  in aspeed_i2c_master_irq()
505 			aspeed_i2c_do_stop(bus);  in aspeed_i2c_master_irq()
510 			aspeed_i2c_do_stop(bus);  in aspeed_i2c_master_irq()
514 			bus->master_state = ASPEED_I2C_MASTER_RX_FIRST;  in aspeed_i2c_master_irq()
516 			bus->master_state = ASPEED_I2C_MASTER_TX_FIRST;  in aspeed_i2c_master_irq()
519 	switch (bus->master_state) {  in aspeed_i2c_master_irq()
522 			dev_dbg(bus->dev, "slave NACKed TX\n");  in aspeed_i2c_master_irq()
526 			dev_err(bus->dev, "slave failed to ACK TX\n");  in aspeed_i2c_master_irq()
532 		if (bus->buf_index < msg->len) {  in aspeed_i2c_master_irq()
533 			bus->master_state = ASPEED_I2C_MASTER_TX;  in aspeed_i2c_master_irq()
534 			writel(msg->buf[bus->buf_index++],  in aspeed_i2c_master_irq()
535 			       bus->base + ASPEED_I2C_BYTE_BUF_REG);  in aspeed_i2c_master_irq()
537 			       bus->base + ASPEED_I2C_CMD_REG);  in aspeed_i2c_master_irq()
539 			aspeed_i2c_next_msg_or_stop(bus);  in aspeed_i2c_master_irq()
549 			dev_err(bus->dev, "master failed to RX\n");  in aspeed_i2c_master_irq()
554 		recv_byte = readl(bus->base + ASPEED_I2C_BYTE_BUF_REG) >> 8;  in aspeed_i2c_master_irq()
555 		msg->buf[bus->buf_index++] = recv_byte;  in aspeed_i2c_master_irq()
559 				bus->cmd_err = -EPROTO;  in aspeed_i2c_master_irq()
560 				aspeed_i2c_do_stop(bus);  in aspeed_i2c_master_irq()
568 		if (bus->buf_index < msg->len) {  in aspeed_i2c_master_irq()
569 			bus->master_state = ASPEED_I2C_MASTER_RX;  in aspeed_i2c_master_irq()
571 			if (bus->buf_index + 1 == msg->len)  in aspeed_i2c_master_irq()
573 			writel(command, bus->base + ASPEED_I2C_CMD_REG);  in aspeed_i2c_master_irq()
575 			aspeed_i2c_next_msg_or_stop(bus);  in aspeed_i2c_master_irq()
580 			dev_err(bus->dev,  in aspeed_i2c_master_irq()
583 			bus->cmd_err = -EIO;  in aspeed_i2c_master_irq()
589 		bus->master_state = ASPEED_I2C_MASTER_INACTIVE;  in aspeed_i2c_master_irq()
592 		dev_err(bus->dev,  in aspeed_i2c_master_irq()
595 		bus->cmd_err = -EIO;  in aspeed_i2c_master_irq()
600 		bus->master_state = ASPEED_I2C_MASTER_INACTIVE;  in aspeed_i2c_master_irq()
601 		bus->cmd_err = -EINVAL;  in aspeed_i2c_master_irq()
605 	bus->cmd_err = -EIO;  in aspeed_i2c_master_irq()
606 	aspeed_i2c_do_stop(bus);  in aspeed_i2c_master_irq()
609 	bus->msgs = NULL;  in aspeed_i2c_master_irq()
610 	if (bus->cmd_err)  in aspeed_i2c_master_irq()
611 		bus->master_xfer_result = bus->cmd_err;  in aspeed_i2c_master_irq()
613 		bus->master_xfer_result = bus->msgs_index + 1;  in aspeed_i2c_master_irq()
614 	complete(&bus->cmd_complete);  in aspeed_i2c_master_irq()
621 	struct aspeed_i2c_bus *bus = dev_id;  in aspeed_i2c_bus_irq()  local
624 	spin_lock(&bus->lock);  in aspeed_i2c_bus_irq()
625 	irq_received = readl(bus->base + ASPEED_I2C_INTR_STS_REG);  in aspeed_i2c_bus_irq()
628 	       bus->base + ASPEED_I2C_INTR_STS_REG);  in aspeed_i2c_bus_irq()
629 	readl(bus->base + ASPEED_I2C_INTR_STS_REG);  in aspeed_i2c_bus_irq()
641 	if (bus->master_state != ASPEED_I2C_MASTER_INACTIVE &&  in aspeed_i2c_bus_irq()
642 	    bus->master_state != ASPEED_I2C_MASTER_PENDING) {  in aspeed_i2c_bus_irq()
643 		irq_handled = aspeed_i2c_master_irq(bus, irq_remaining);  in aspeed_i2c_bus_irq()
646 			irq_handled |= aspeed_i2c_slave_irq(bus, irq_remaining);  in aspeed_i2c_bus_irq()
648 		irq_handled = aspeed_i2c_slave_irq(bus, irq_remaining);  in aspeed_i2c_bus_irq()
651 			irq_handled |= aspeed_i2c_master_irq(bus,  in aspeed_i2c_bus_irq()
659 	if (bus->master_state == ASPEED_I2C_MASTER_PENDING &&  in aspeed_i2c_bus_irq()
660 	    bus->slave_state == ASPEED_I2C_SLAVE_INACTIVE)  in aspeed_i2c_bus_irq()
661 		aspeed_i2c_do_start(bus);  in aspeed_i2c_bus_irq()
663 	irq_handled = aspeed_i2c_master_irq(bus, irq_remaining);  in aspeed_i2c_bus_irq()
668 		dev_err(bus->dev,  in aspeed_i2c_bus_irq()
675 		       bus->base + ASPEED_I2C_INTR_STS_REG);  in aspeed_i2c_bus_irq()
676 		readl(bus->base + ASPEED_I2C_INTR_STS_REG);  in aspeed_i2c_bus_irq()
678 	spin_unlock(&bus->lock);  in aspeed_i2c_bus_irq()
685 	struct aspeed_i2c_bus *bus = i2c_get_adapdata(adap);  in aspeed_i2c_master_xfer()  local
688 	spin_lock_irqsave(&bus->lock, flags);  in aspeed_i2c_master_xfer()
689 	bus->cmd_err = 0;  in aspeed_i2c_master_xfer()
691 	/* If bus is busy in a single master environment, attempt recovery. */  in aspeed_i2c_master_xfer()
692 	if (!bus->multi_master &&  in aspeed_i2c_master_xfer()
693 	    (readl(bus->base + ASPEED_I2C_CMD_REG) &  in aspeed_i2c_master_xfer()
697 		spin_unlock_irqrestore(&bus->lock, flags);  in aspeed_i2c_master_xfer()
698 		ret = aspeed_i2c_recover_bus(bus);  in aspeed_i2c_master_xfer()
701 		spin_lock_irqsave(&bus->lock, flags);  in aspeed_i2c_master_xfer()
704 	bus->cmd_err = 0;  in aspeed_i2c_master_xfer()
705 	bus->msgs = msgs;  in aspeed_i2c_master_xfer()
706 	bus->msgs_index = 0;  in aspeed_i2c_master_xfer()
707 	bus->msgs_count = num;  in aspeed_i2c_master_xfer()
709 	reinit_completion(&bus->cmd_complete);  in aspeed_i2c_master_xfer()
710 	aspeed_i2c_do_start(bus);  in aspeed_i2c_master_xfer()
711 	spin_unlock_irqrestore(&bus->lock, flags);  in aspeed_i2c_master_xfer()
713 	time_left = wait_for_completion_timeout(&bus->cmd_complete,  in aspeed_i2c_master_xfer()
714 						bus->adap.timeout);  in aspeed_i2c_master_xfer()
719 		 * recovery. But if the bus is idle, we still need to reset the  in aspeed_i2c_master_xfer()
722 		if (bus->multi_master &&  in aspeed_i2c_master_xfer()
723 		    (readl(bus->base + ASPEED_I2C_CMD_REG) &  in aspeed_i2c_master_xfer()
725 			aspeed_i2c_recover_bus(bus);  in aspeed_i2c_master_xfer()
727 			aspeed_i2c_reset(bus);  in aspeed_i2c_master_xfer()
733 		spin_lock_irqsave(&bus->lock, flags);  in aspeed_i2c_master_xfer()
734 		if (bus->master_state == ASPEED_I2C_MASTER_PENDING)  in aspeed_i2c_master_xfer()
735 			bus->master_state = ASPEED_I2C_MASTER_INACTIVE;  in aspeed_i2c_master_xfer()
736 		spin_unlock_irqrestore(&bus->lock, flags);  in aspeed_i2c_master_xfer()
741 	return bus->master_xfer_result;  in aspeed_i2c_master_xfer()
750 /* precondition: bus.lock has been acquired. */
751 static void __aspeed_i2c_reg_slave(struct aspeed_i2c_bus *bus, u16 slave_addr)  in __aspeed_i2c_reg_slave()  argument
760 	 * end up with additional phantom devices responding on the bus.  in __aspeed_i2c_reg_slave()
763 	writel(addr_reg_val, bus->base + ASPEED_I2C_DEV_ADDR_REG);  in __aspeed_i2c_reg_slave()
766 	func_ctrl_reg_val = readl(bus->base + ASPEED_I2C_FUN_CTRL_REG);  in __aspeed_i2c_reg_slave()
768 	writel(func_ctrl_reg_val, bus->base + ASPEED_I2C_FUN_CTRL_REG);  in __aspeed_i2c_reg_slave()
770 	bus->slave_state = ASPEED_I2C_SLAVE_INACTIVE;  in __aspeed_i2c_reg_slave()
775 	struct aspeed_i2c_bus *bus = i2c_get_adapdata(client->adapter);  in aspeed_i2c_reg_slave()  local
778 	spin_lock_irqsave(&bus->lock, flags);  in aspeed_i2c_reg_slave()
779 	if (bus->slave) {  in aspeed_i2c_reg_slave()
780 		spin_unlock_irqrestore(&bus->lock, flags);  in aspeed_i2c_reg_slave()
784 	__aspeed_i2c_reg_slave(bus, client->addr);  in aspeed_i2c_reg_slave()
786 	bus->slave = client;  in aspeed_i2c_reg_slave()
787 	spin_unlock_irqrestore(&bus->lock, flags);  in aspeed_i2c_reg_slave()
794 	struct aspeed_i2c_bus *bus = i2c_get_adapdata(client->adapter);  in aspeed_i2c_unreg_slave()  local
798 	spin_lock_irqsave(&bus->lock, flags);  in aspeed_i2c_unreg_slave()
799 	if (!bus->slave) {  in aspeed_i2c_unreg_slave()
800 		spin_unlock_irqrestore(&bus->lock, flags);  in aspeed_i2c_unreg_slave()
805 	func_ctrl_reg_val = readl(bus->base + ASPEED_I2C_FUN_CTRL_REG);  in aspeed_i2c_unreg_slave()
807 	writel(func_ctrl_reg_val, bus->base + ASPEED_I2C_FUN_CTRL_REG);  in aspeed_i2c_unreg_slave()
809 	bus->slave = NULL;  in aspeed_i2c_unreg_slave()
810 	spin_unlock_irqrestore(&bus->lock, flags);  in aspeed_i2c_unreg_slave()
910 /* precondition: bus.lock has been acquired. */
911 static int aspeed_i2c_init_clk(struct aspeed_i2c_bus *bus)  in aspeed_i2c_init_clk()  argument
915 	divisor = DIV_ROUND_UP(bus->parent_clk_frequency, bus->bus_frequency);  in aspeed_i2c_init_clk()
916 	clk_reg_val = readl(bus->base + ASPEED_I2C_AC_TIMING_REG1);  in aspeed_i2c_init_clk()
920 	clk_reg_val |= bus->get_clk_reg_val(bus->dev, divisor);  in aspeed_i2c_init_clk()
921 	writel(clk_reg_val, bus->base + ASPEED_I2C_AC_TIMING_REG1);  in aspeed_i2c_init_clk()
922 	writel(ASPEED_NO_TIMEOUT_CTRL, bus->base + ASPEED_I2C_AC_TIMING_REG2);  in aspeed_i2c_init_clk()
927 /* precondition: bus.lock has been acquired. */
928 static int aspeed_i2c_init(struct aspeed_i2c_bus *bus,  in aspeed_i2c_init()  argument
935 	writel(0, bus->base + ASPEED_I2C_FUN_CTRL_REG);  in aspeed_i2c_init()
937 	ret = aspeed_i2c_init_clk(bus);  in aspeed_i2c_init()
942 		bus->multi_master = true;  in aspeed_i2c_init()
947 	writel(readl(bus->base + ASPEED_I2C_FUN_CTRL_REG) | fun_ctrl_reg,  in aspeed_i2c_init()
948 	       bus->base + ASPEED_I2C_FUN_CTRL_REG);  in aspeed_i2c_init()
952 	if (bus->slave)  in aspeed_i2c_init()
953 		__aspeed_i2c_reg_slave(bus, bus->slave->addr);  in aspeed_i2c_init()
957 	writel(ASPEED_I2CD_INTR_ALL, bus->base + ASPEED_I2C_INTR_CTRL_REG);  in aspeed_i2c_init()
962 static int aspeed_i2c_reset(struct aspeed_i2c_bus *bus)  in aspeed_i2c_reset()  argument
964 	struct platform_device *pdev = to_platform_device(bus->dev);  in aspeed_i2c_reset()
968 	spin_lock_irqsave(&bus->lock, flags);  in aspeed_i2c_reset()
971 	writel(0, bus->base + ASPEED_I2C_INTR_CTRL_REG);  in aspeed_i2c_reset()
972 	writel(0xffffffff, bus->base + ASPEED_I2C_INTR_STS_REG);  in aspeed_i2c_reset()
974 	ret = aspeed_i2c_init(bus, pdev);  in aspeed_i2c_reset()
976 	spin_unlock_irqrestore(&bus->lock, flags);  in aspeed_i2c_reset()
983 		.compatible = "aspeed,ast2400-i2c-bus",
987 		.compatible = "aspeed,ast2500-i2c-bus",
991 		.compatible = "aspeed,ast2600-i2c-bus",
1001 	struct aspeed_i2c_bus *bus;  in aspeed_i2c_probe_bus()  local
1005 	bus = devm_kzalloc(&pdev->dev, sizeof(*bus), GFP_KERNEL);  in aspeed_i2c_probe_bus()
1006 	if (!bus)  in aspeed_i2c_probe_bus()
1009 	bus->base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);  in aspeed_i2c_probe_bus()
1010 	if (IS_ERR(bus->base))  in aspeed_i2c_probe_bus()
1011 		return PTR_ERR(bus->base);  in aspeed_i2c_probe_bus()
1016 	bus->parent_clk_frequency = clk_get_rate(parent_clk);  in aspeed_i2c_probe_bus()
1020 	bus->rst = devm_reset_control_get_shared(&pdev->dev, NULL);  in aspeed_i2c_probe_bus()
1021 	if (IS_ERR(bus->rst)) {  in aspeed_i2c_probe_bus()
1024 		return PTR_ERR(bus->rst);  in aspeed_i2c_probe_bus()
1026 	reset_control_deassert(bus->rst);  in aspeed_i2c_probe_bus()
1029 				   "bus-frequency", &bus->bus_frequency);  in aspeed_i2c_probe_bus()
1032 			"Could not read bus-frequency property\n");  in aspeed_i2c_probe_bus()
1033 		bus->bus_frequency = I2C_MAX_STANDARD_MODE_FREQ;  in aspeed_i2c_probe_bus()
1038 		bus->get_clk_reg_val = aspeed_i2c_24xx_get_clk_reg_val;  in aspeed_i2c_probe_bus()
1040 		bus->get_clk_reg_val = (u32 (*)(struct device *, u32))  in aspeed_i2c_probe_bus()
1044 	spin_lock_init(&bus->lock);  in aspeed_i2c_probe_bus()
1045 	init_completion(&bus->cmd_complete);  in aspeed_i2c_probe_bus()
1046 	bus->adap.owner = THIS_MODULE;  in aspeed_i2c_probe_bus()
1047 	bus->adap.retries = 0;  in aspeed_i2c_probe_bus()
1048 	bus->adap.algo = &aspeed_i2c_algo;  in aspeed_i2c_probe_bus()
1049 	bus->adap.dev.parent = &pdev->dev;  in aspeed_i2c_probe_bus()
1050 	bus->adap.dev.of_node = pdev->dev.of_node;  in aspeed_i2c_probe_bus()
1051 	strscpy(bus->adap.name, pdev->name, sizeof(bus->adap.name));  in aspeed_i2c_probe_bus()
1052 	i2c_set_adapdata(&bus->adap, bus);  in aspeed_i2c_probe_bus()
1054 	bus->dev = &pdev->dev;  in aspeed_i2c_probe_bus()
1057 	writel(0, bus->base + ASPEED_I2C_INTR_CTRL_REG);  in aspeed_i2c_probe_bus()
1058 	writel(0xffffffff, bus->base + ASPEED_I2C_INTR_STS_REG);  in aspeed_i2c_probe_bus()
1060 	 * bus.lock does not need to be held because the interrupt handler has  in aspeed_i2c_probe_bus()
1063 	ret = aspeed_i2c_init(bus, pdev);  in aspeed_i2c_probe_bus()
1069 			       0, dev_name(&pdev->dev), bus);  in aspeed_i2c_probe_bus()
1073 	ret = i2c_add_adapter(&bus->adap);  in aspeed_i2c_probe_bus()
1077 	platform_set_drvdata(pdev, bus);  in aspeed_i2c_probe_bus()
1079 	dev_info(bus->dev, "i2c bus %d registered, irq %d\n",  in aspeed_i2c_probe_bus()
1080 		 bus->adap.nr, irq);  in aspeed_i2c_probe_bus()
1087 	struct aspeed_i2c_bus *bus = platform_get_drvdata(pdev);  in aspeed_i2c_remove_bus()  local
1090 	spin_lock_irqsave(&bus->lock, flags);  in aspeed_i2c_remove_bus()
1093 	writel(0, bus->base + ASPEED_I2C_FUN_CTRL_REG);  in aspeed_i2c_remove_bus()
1094 	writel(0, bus->base + ASPEED_I2C_INTR_CTRL_REG);  in aspeed_i2c_remove_bus()
1096 	spin_unlock_irqrestore(&bus->lock, flags);  in aspeed_i2c_remove_bus()
1098 	reset_control_assert(bus->rst);  in aspeed_i2c_remove_bus()
1100 	i2c_del_adapter(&bus->adap);  in aspeed_i2c_remove_bus()
1107 		.name		= "aspeed-i2c-bus",
1114 MODULE_DESCRIPTION("Aspeed I2C Bus Driver");