86 static void enable_tx_interrupt(struct ehv_bc_data *bc)  in enable_tx_interrupt()  argument
88 	if (!bc->tx_irq_enabled) {  in enable_tx_interrupt()
89 		enable_irq(bc->tx_irq);  in enable_tx_interrupt()
90 		bc->tx_irq_enabled = 1;  in enable_tx_interrupt()
94 static void disable_tx_interrupt(struct ehv_bc_data *bc)  in disable_tx_interrupt()  argument
96 	if (bc->tx_irq_enabled) {  in disable_tx_interrupt()
97 		disable_irq_nosync(bc->tx_irq);  in disable_tx_interrupt()
98 		bc->tx_irq_enabled = 0;  in disable_tx_interrupt()
334 	struct ehv_bc_data *bc = data;  in ehv_bc_tty_rx_isr()  local
344 	ev_byte_channel_poll(bc->handle, &rx_count, &tx_count);  in ehv_bc_tty_rx_isr()
345 	count = tty_buffer_request_room(&bc->port, rx_count);  in ehv_bc_tty_rx_isr()
359 		ev_byte_channel_receive(bc->handle, &len, buffer);  in ehv_bc_tty_rx_isr()
366 		ret = tty_insert_flip_string(&bc->port, buffer, len);  in ehv_bc_tty_rx_isr()
381 	tty_flip_buffer_push(&bc->port);  in ehv_bc_tty_rx_isr()
392 static void ehv_bc_tx_dequeue(struct ehv_bc_data *bc)  in ehv_bc_tx_dequeue()  argument
399 		spin_lock_irqsave(&bc->lock, flags);  in ehv_bc_tx_dequeue()
401 			    CIRC_CNT_TO_END(bc->head, bc->tail, BUF_SIZE),  in ehv_bc_tx_dequeue()
404 		ret = ev_byte_channel_send(bc->handle, &len, bc->buf + bc->tail);  in ehv_bc_tx_dequeue()
408 			bc->tail = (bc->tail + len) & (BUF_SIZE - 1);  in ehv_bc_tx_dequeue()
410 		count = CIRC_CNT(bc->head, bc->tail, BUF_SIZE);  in ehv_bc_tx_dequeue()
411 		spin_unlock_irqrestore(&bc->lock, flags);  in ehv_bc_tx_dequeue()
414 	spin_lock_irqsave(&bc->lock, flags);  in ehv_bc_tx_dequeue()
415 	if (CIRC_CNT(bc->head, bc->tail, BUF_SIZE))  in ehv_bc_tx_dequeue()
421 		enable_tx_interrupt(bc);  in ehv_bc_tx_dequeue()
423 		disable_tx_interrupt(bc);  in ehv_bc_tx_dequeue()
424 	spin_unlock_irqrestore(&bc->lock, flags);  in ehv_bc_tx_dequeue()
435 	struct ehv_bc_data *bc = data;  in ehv_bc_tty_tx_isr()  local
437 	ehv_bc_tx_dequeue(bc);  in ehv_bc_tty_tx_isr()
438 	tty_port_tty_wakeup(&bc->port);  in ehv_bc_tty_tx_isr()
457 	struct ehv_bc_data *bc = ttys->driver_data;  in ehv_bc_tty_write()  local
463 		spin_lock_irqsave(&bc->lock, flags);  in ehv_bc_tty_write()
464 		len = CIRC_SPACE_TO_END(bc->head, bc->tail, BUF_SIZE);  in ehv_bc_tty_write()
468 			memcpy(bc->buf + bc->head, s, len);  in ehv_bc_tty_write()
469 			bc->head = (bc->head + len) & (BUF_SIZE - 1);  in ehv_bc_tty_write()
471 		spin_unlock_irqrestore(&bc->lock, flags);  in ehv_bc_tty_write()
480 	ehv_bc_tx_dequeue(bc);  in ehv_bc_tty_write()
496 	struct ehv_bc_data *bc = &bcs[ttys->index];  in ehv_bc_tty_open()  local
498 	if (!bc->dev)  in ehv_bc_tty_open()
501 	return tty_port_open(&bc->port, ttys, filp);  in ehv_bc_tty_open()
511 	struct ehv_bc_data *bc = &bcs[ttys->index];  in ehv_bc_tty_close()  local
513 	if (bc->dev)  in ehv_bc_tty_close()
514 		tty_port_close(&bc->port, ttys, filp);  in ehv_bc_tty_close()
526 	struct ehv_bc_data *bc = ttys->driver_data;  in ehv_bc_tty_write_room()  local
530 	spin_lock_irqsave(&bc->lock, flags);  in ehv_bc_tty_write_room()
531 	count = CIRC_SPACE(bc->head, bc->tail, BUF_SIZE);  in ehv_bc_tty_write_room()
532 	spin_unlock_irqrestore(&bc->lock, flags);  in ehv_bc_tty_write_room()
551 	struct ehv_bc_data *bc = ttys->driver_data;  in ehv_bc_tty_throttle()  local
553 	disable_irq(bc->rx_irq);  in ehv_bc_tty_throttle()
565 	struct ehv_bc_data *bc = ttys->driver_data;  in ehv_bc_tty_unthrottle()  local
570 	enable_irq(bc->rx_irq);  in ehv_bc_tty_unthrottle()
575 	struct ehv_bc_data *bc = ttys->driver_data;  in ehv_bc_tty_hangup()  local
577 	ehv_bc_tx_dequeue(bc);  in ehv_bc_tty_hangup()
578 	tty_port_hangup(&bc->port);  in ehv_bc_tty_hangup()
608 	struct ehv_bc_data *bc = container_of(port, struct ehv_bc_data, port);  in ehv_bc_tty_port_activate()  local
611 	ttys->driver_data = bc;  in ehv_bc_tty_port_activate()
613 	ret = request_irq(bc->rx_irq, ehv_bc_tty_rx_isr, 0, "ehv-bc", bc);  in ehv_bc_tty_port_activate()
615 		dev_err(bc->dev, "could not request rx irq %u (ret=%i)\n",  in ehv_bc_tty_port_activate()
616 		       bc->rx_irq, ret);  in ehv_bc_tty_port_activate()
621 	bc->tx_irq_enabled = 1;  in ehv_bc_tty_port_activate()
623 	ret = request_irq(bc->tx_irq, ehv_bc_tty_tx_isr, 0, "ehv-bc", bc);  in ehv_bc_tty_port_activate()
625 		dev_err(bc->dev, "could not request tx irq %u (ret=%i)\n",  in ehv_bc_tty_port_activate()
626 		       bc->tx_irq, ret);  in ehv_bc_tty_port_activate()
627 		free_irq(bc->rx_irq, bc);  in ehv_bc_tty_port_activate()
634 	disable_tx_interrupt(bc);  in ehv_bc_tty_port_activate()
641 	struct ehv_bc_data *bc = container_of(port, struct ehv_bc_data, port);  in ehv_bc_tty_port_shutdown()  local
643 	free_irq(bc->tx_irq, bc);  in ehv_bc_tty_port_shutdown()
644 	free_irq(bc->rx_irq, bc);  in ehv_bc_tty_port_shutdown()
655 	struct ehv_bc_data *bc;  in ehv_bc_tty_probe()  local
675 	bc = &bcs[i];  in ehv_bc_tty_probe()
677 	bc->handle = handle;  in ehv_bc_tty_probe()
678 	bc->head = 0;  in ehv_bc_tty_probe()
679 	bc->tail = 0;  in ehv_bc_tty_probe()
680 	spin_lock_init(&bc->lock);  in ehv_bc_tty_probe()
682 	bc->rx_irq = irq_of_parse_and_map(np, 0);  in ehv_bc_tty_probe()
683 	bc->tx_irq = irq_of_parse_and_map(np, 1);  in ehv_bc_tty_probe()
684 	if ((bc->rx_irq == NO_IRQ) || (bc->tx_irq == NO_IRQ)) {  in ehv_bc_tty_probe()
691 	tty_port_init(&bc->port);  in ehv_bc_tty_probe()
692 	bc->port.ops = &ehv_bc_tty_port_ops;  in ehv_bc_tty_probe()
694 	bc->dev = tty_port_register_device(&bc->port, ehv_bc_driver, i,  in ehv_bc_tty_probe()
696 	if (IS_ERR(bc->dev)) {  in ehv_bc_tty_probe()
697 		ret = PTR_ERR(bc->dev);  in ehv_bc_tty_probe()
702 	dev_set_drvdata(&pdev->dev, bc);  in ehv_bc_tty_probe()
705 		ehv_bc_driver->name, i, bc->handle);  in ehv_bc_tty_probe()
710 	tty_port_destroy(&bc->port);  in ehv_bc_tty_probe()
711 	irq_dispose_mapping(bc->tx_irq);  in ehv_bc_tty_probe()
712 	irq_dispose_mapping(bc->rx_irq);  in ehv_bc_tty_probe()
714 	memset(bc, 0, sizeof(struct ehv_bc_data));  in ehv_bc_tty_probe()