90 static void enable_tx_interrupt(struct ehv_bc_data *bc)  in enable_tx_interrupt()  argument
92 	if (!bc->tx_irq_enabled) {  in enable_tx_interrupt()
93 		enable_irq(bc->tx_irq);  in enable_tx_interrupt()
94 		bc->tx_irq_enabled = 1;  in enable_tx_interrupt()
98 static void disable_tx_interrupt(struct ehv_bc_data *bc)  in disable_tx_interrupt()  argument
100 	if (bc->tx_irq_enabled) {  in disable_tx_interrupt()
101 		disable_irq_nosync(bc->tx_irq);  in disable_tx_interrupt()
102 		bc->tx_irq_enabled = 0;  in disable_tx_interrupt()
338 	struct ehv_bc_data *bc = data;  in ehv_bc_tty_rx_isr()  local
348 	ev_byte_channel_poll(bc->handle, &rx_count, &tx_count);  in ehv_bc_tty_rx_isr()
349 	count = tty_buffer_request_room(&bc->port, rx_count);  in ehv_bc_tty_rx_isr()
363 		ev_byte_channel_receive(bc->handle, &len, buffer);  in ehv_bc_tty_rx_isr()
370 		ret = tty_insert_flip_string(&bc->port, buffer, len);  in ehv_bc_tty_rx_isr()
385 	tty_flip_buffer_push(&bc->port);  in ehv_bc_tty_rx_isr()
396 static void ehv_bc_tx_dequeue(struct ehv_bc_data *bc)  in ehv_bc_tx_dequeue()  argument
403 		spin_lock_irqsave(&bc->lock, flags);  in ehv_bc_tx_dequeue()
405 			    CIRC_CNT_TO_END(bc->head, bc->tail, BUF_SIZE),  in ehv_bc_tx_dequeue()
408 		ret = ev_byte_channel_send(bc->handle, &len, bc->buf + bc->tail);  in ehv_bc_tx_dequeue()
412 			bc->tail = (bc->tail + len) & (BUF_SIZE - 1);  in ehv_bc_tx_dequeue()
414 		count = CIRC_CNT(bc->head, bc->tail, BUF_SIZE);  in ehv_bc_tx_dequeue()
415 		spin_unlock_irqrestore(&bc->lock, flags);  in ehv_bc_tx_dequeue()
418 	spin_lock_irqsave(&bc->lock, flags);  in ehv_bc_tx_dequeue()
419 	if (CIRC_CNT(bc->head, bc->tail, BUF_SIZE))  in ehv_bc_tx_dequeue()
425 		enable_tx_interrupt(bc);  in ehv_bc_tx_dequeue()
427 		disable_tx_interrupt(bc);  in ehv_bc_tx_dequeue()
428 	spin_unlock_irqrestore(&bc->lock, flags);  in ehv_bc_tx_dequeue()
439 	struct ehv_bc_data *bc = data;  in ehv_bc_tty_tx_isr()  local
441 	ehv_bc_tx_dequeue(bc);  in ehv_bc_tty_tx_isr()
442 	tty_port_tty_wakeup(&bc->port);  in ehv_bc_tty_tx_isr()
461 	struct ehv_bc_data *bc = ttys->driver_data;  in ehv_bc_tty_write()  local
467 		spin_lock_irqsave(&bc->lock, flags);  in ehv_bc_tty_write()
468 		len = CIRC_SPACE_TO_END(bc->head, bc->tail, BUF_SIZE);  in ehv_bc_tty_write()
472 			memcpy(bc->buf + bc->head, s, len);  in ehv_bc_tty_write()
473 			bc->head = (bc->head + len) & (BUF_SIZE - 1);  in ehv_bc_tty_write()
475 		spin_unlock_irqrestore(&bc->lock, flags);  in ehv_bc_tty_write()
484 	ehv_bc_tx_dequeue(bc);  in ehv_bc_tty_write()
500 	struct ehv_bc_data *bc = &bcs[ttys->index];  in ehv_bc_tty_open()  local
502 	if (!bc->dev)  in ehv_bc_tty_open()
505 	return tty_port_open(&bc->port, ttys, filp);  in ehv_bc_tty_open()
515 	struct ehv_bc_data *bc = &bcs[ttys->index];  in ehv_bc_tty_close()  local
517 	if (bc->dev)  in ehv_bc_tty_close()
518 		tty_port_close(&bc->port, ttys, filp);  in ehv_bc_tty_close()
530 	struct ehv_bc_data *bc = ttys->driver_data;  in ehv_bc_tty_write_room()  local
534 	spin_lock_irqsave(&bc->lock, flags);  in ehv_bc_tty_write_room()
535 	count = CIRC_SPACE(bc->head, bc->tail, BUF_SIZE);  in ehv_bc_tty_write_room()
536 	spin_unlock_irqrestore(&bc->lock, flags);  in ehv_bc_tty_write_room()
555 	struct ehv_bc_data *bc = ttys->driver_data;  in ehv_bc_tty_throttle()  local
557 	disable_irq(bc->rx_irq);  in ehv_bc_tty_throttle()
569 	struct ehv_bc_data *bc = ttys->driver_data;  in ehv_bc_tty_unthrottle()  local
574 	enable_irq(bc->rx_irq);  in ehv_bc_tty_unthrottle()
579 	struct ehv_bc_data *bc = ttys->driver_data;  in ehv_bc_tty_hangup()  local
581 	ehv_bc_tx_dequeue(bc);  in ehv_bc_tty_hangup()
582 	tty_port_hangup(&bc->port);  in ehv_bc_tty_hangup()
612 	struct ehv_bc_data *bc = container_of(port, struct ehv_bc_data, port);  in ehv_bc_tty_port_activate()  local
615 	ttys->driver_data = bc;  in ehv_bc_tty_port_activate()
617 	ret = request_irq(bc->rx_irq, ehv_bc_tty_rx_isr, 0, "ehv-bc", bc);  in ehv_bc_tty_port_activate()
619 		dev_err(bc->dev, "could not request rx irq %u (ret=%i)\n",  in ehv_bc_tty_port_activate()
620 		       bc->rx_irq, ret);  in ehv_bc_tty_port_activate()
625 	bc->tx_irq_enabled = 1;  in ehv_bc_tty_port_activate()
627 	ret = request_irq(bc->tx_irq, ehv_bc_tty_tx_isr, 0, "ehv-bc", bc);  in ehv_bc_tty_port_activate()
629 		dev_err(bc->dev, "could not request tx irq %u (ret=%i)\n",  in ehv_bc_tty_port_activate()
630 		       bc->tx_irq, ret);  in ehv_bc_tty_port_activate()
631 		free_irq(bc->rx_irq, bc);  in ehv_bc_tty_port_activate()
638 	disable_tx_interrupt(bc);  in ehv_bc_tty_port_activate()
645 	struct ehv_bc_data *bc = container_of(port, struct ehv_bc_data, port);  in ehv_bc_tty_port_shutdown()  local
647 	free_irq(bc->tx_irq, bc);  in ehv_bc_tty_port_shutdown()
648 	free_irq(bc->rx_irq, bc);  in ehv_bc_tty_port_shutdown()
659 	struct ehv_bc_data *bc;  in ehv_bc_tty_probe()  local
679 	bc = &bcs[i];  in ehv_bc_tty_probe()
681 	bc->handle = handle;  in ehv_bc_tty_probe()
682 	bc->head = 0;  in ehv_bc_tty_probe()
683 	bc->tail = 0;  in ehv_bc_tty_probe()
684 	spin_lock_init(&bc->lock);  in ehv_bc_tty_probe()
686 	bc->rx_irq = irq_of_parse_and_map(np, 0);  in ehv_bc_tty_probe()
687 	bc->tx_irq = irq_of_parse_and_map(np, 1);  in ehv_bc_tty_probe()
688 	if ((bc->rx_irq == NO_IRQ) || (bc->tx_irq == NO_IRQ)) {  in ehv_bc_tty_probe()
695 	tty_port_init(&bc->port);  in ehv_bc_tty_probe()
696 	bc->port.ops = &ehv_bc_tty_port_ops;  in ehv_bc_tty_probe()
698 	bc->dev = tty_port_register_device(&bc->port, ehv_bc_driver, i,  in ehv_bc_tty_probe()
700 	if (IS_ERR(bc->dev)) {  in ehv_bc_tty_probe()
701 		ret = PTR_ERR(bc->dev);  in ehv_bc_tty_probe()
706 	dev_set_drvdata(&pdev->dev, bc);  in ehv_bc_tty_probe()
709 		ehv_bc_driver->name, i, bc->handle);  in ehv_bc_tty_probe()
714 	tty_port_destroy(&bc->port);  in ehv_bc_tty_probe()
715 	irq_dispose_mapping(bc->tx_irq);  in ehv_bc_tty_probe()
716 	irq_dispose_mapping(bc->rx_irq);  in ehv_bc_tty_probe()
718 	memset(bc, 0, sizeof(struct ehv_bc_data));  in ehv_bc_tty_probe()
724 	struct ehv_bc_data *bc = dev_get_drvdata(&pdev->dev);  in ehv_bc_tty_remove()  local
726 	tty_unregister_device(ehv_bc_driver, bc - bcs);  in ehv_bc_tty_remove()
728 	tty_port_destroy(&bc->port);  in ehv_bc_tty_remove()
729 	irq_dispose_mapping(bc->tx_irq);  in ehv_bc_tty_remove()
730 	irq_dispose_mapping(bc->rx_irq);  in ehv_bc_tty_remove()