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()
122 		pr_err("ehv-bc: no 'interrupts' property in %pOF node\n", np);  in find_console_handle()
131 		pr_err("ehv-bc: no 'hv-handle' property in %pOFn node\n",  in find_console_handle()
217 	udbg_printf("ehv-bc: early console using byte channel handle %u\n",  in udbg_init_ehv_bc()
316 		pr_debug("ehv-bc: stdout is not a byte channel\n");  in ehv_bc_console_init()
325 		pr_warn("ehv-bc: udbg handle %u is not the stdout handle\n",  in ehv_bc_console_init()
336 	pr_info("ehv-bc: registered console driver for byte channel %u\n",  in ehv_bc_console_init()
352 	struct ehv_bc_data *bc = data;  in ehv_bc_tty_rx_isr()  local
362 	ev_byte_channel_poll(bc->handle, &rx_count, &tx_count);  in ehv_bc_tty_rx_isr()
363 	count = tty_buffer_request_room(&bc->port, rx_count);  in ehv_bc_tty_rx_isr()
377 		ev_byte_channel_receive(bc->handle, &len, buffer);  in ehv_bc_tty_rx_isr()
384 		ret = tty_insert_flip_string(&bc->port, buffer, len);  in ehv_bc_tty_rx_isr()
399 	tty_flip_buffer_push(&bc->port);  in ehv_bc_tty_rx_isr()
410 static void ehv_bc_tx_dequeue(struct ehv_bc_data *bc)  in ehv_bc_tx_dequeue()  argument
417 		spin_lock_irqsave(&bc->lock, flags);  in ehv_bc_tx_dequeue()
419 			    CIRC_CNT_TO_END(bc->head, bc->tail, BUF_SIZE),  in ehv_bc_tx_dequeue()
422 		ret = local_ev_byte_channel_send(bc->handle, &len, bc->buf + bc->tail);  in ehv_bc_tx_dequeue()
426 			bc->tail = (bc->tail + len) & (BUF_SIZE - 1);  in ehv_bc_tx_dequeue()
428 		count = CIRC_CNT(bc->head, bc->tail, BUF_SIZE);  in ehv_bc_tx_dequeue()
429 		spin_unlock_irqrestore(&bc->lock, flags);  in ehv_bc_tx_dequeue()
432 	spin_lock_irqsave(&bc->lock, flags);  in ehv_bc_tx_dequeue()
433 	if (CIRC_CNT(bc->head, bc->tail, BUF_SIZE))  in ehv_bc_tx_dequeue()
439 		enable_tx_interrupt(bc);  in ehv_bc_tx_dequeue()
441 		disable_tx_interrupt(bc);  in ehv_bc_tx_dequeue()
442 	spin_unlock_irqrestore(&bc->lock, flags);  in ehv_bc_tx_dequeue()
453 	struct ehv_bc_data *bc = data;  in ehv_bc_tty_tx_isr()  local
455 	ehv_bc_tx_dequeue(bc);  in ehv_bc_tty_tx_isr()
456 	tty_port_tty_wakeup(&bc->port);  in ehv_bc_tty_tx_isr()
475 	struct ehv_bc_data *bc = ttys->driver_data;  in ehv_bc_tty_write()  local
480 		spin_lock_irqsave(&bc->lock, flags);  in ehv_bc_tty_write()
481 		len = CIRC_SPACE_TO_END(bc->head, bc->tail, BUF_SIZE);  in ehv_bc_tty_write()
485 			memcpy(bc->buf + bc->head, s, len);  in ehv_bc_tty_write()
486 			bc->head = (bc->head + len) & (BUF_SIZE - 1);  in ehv_bc_tty_write()
488 		spin_unlock_irqrestore(&bc->lock, flags);  in ehv_bc_tty_write()
497 	ehv_bc_tx_dequeue(bc);  in ehv_bc_tty_write()
504  * why we initialize bc->ttys in ehv_bc_tty_port_activate() instead.
513 	struct ehv_bc_data *bc = &bcs[ttys->index];  in ehv_bc_tty_open()  local
515 	if (!bc->dev)  in ehv_bc_tty_open()
518 	return tty_port_open(&bc->port, ttys, filp);  in ehv_bc_tty_open()
528 	struct ehv_bc_data *bc = &bcs[ttys->index];  in ehv_bc_tty_close()  local
530 	if (bc->dev)  in ehv_bc_tty_close()
531 		tty_port_close(&bc->port, ttys, filp);  in ehv_bc_tty_close()
543 	struct ehv_bc_data *bc = ttys->driver_data;  in ehv_bc_tty_write_room()  local
547 	spin_lock_irqsave(&bc->lock, flags);  in ehv_bc_tty_write_room()
548 	count = CIRC_SPACE(bc->head, bc->tail, BUF_SIZE);  in ehv_bc_tty_write_room()
549 	spin_unlock_irqrestore(&bc->lock, flags);  in ehv_bc_tty_write_room()
568 	struct ehv_bc_data *bc = ttys->driver_data;  in ehv_bc_tty_throttle()  local
570 	disable_irq(bc->rx_irq);  in ehv_bc_tty_throttle()
582 	struct ehv_bc_data *bc = ttys->driver_data;  in ehv_bc_tty_unthrottle()  local
587 	enable_irq(bc->rx_irq);  in ehv_bc_tty_unthrottle()
592 	struct ehv_bc_data *bc = ttys->driver_data;  in ehv_bc_tty_hangup()  local
594 	ehv_bc_tx_dequeue(bc);  in ehv_bc_tty_hangup()
595 	tty_port_hangup(&bc->port);  in ehv_bc_tty_hangup()
625 	struct ehv_bc_data *bc = container_of(port, struct ehv_bc_data, port);  in ehv_bc_tty_port_activate()  local
628 	ttys->driver_data = bc;  in ehv_bc_tty_port_activate()
630 	ret = request_irq(bc->rx_irq, ehv_bc_tty_rx_isr, 0, "ehv-bc", bc);  in ehv_bc_tty_port_activate()
632 		dev_err(bc->dev, "could not request rx irq %u (ret=%i)\n",  in ehv_bc_tty_port_activate()
633 		       bc->rx_irq, ret);  in ehv_bc_tty_port_activate()
638 	bc->tx_irq_enabled = 1;  in ehv_bc_tty_port_activate()
640 	ret = request_irq(bc->tx_irq, ehv_bc_tty_tx_isr, 0, "ehv-bc", bc);  in ehv_bc_tty_port_activate()
642 		dev_err(bc->dev, "could not request tx irq %u (ret=%i)\n",  in ehv_bc_tty_port_activate()
643 		       bc->tx_irq, ret);  in ehv_bc_tty_port_activate()
644 		free_irq(bc->rx_irq, bc);  in ehv_bc_tty_port_activate()
651 	disable_tx_interrupt(bc);  in ehv_bc_tty_port_activate()
658 	struct ehv_bc_data *bc = container_of(port, struct ehv_bc_data, port);  in ehv_bc_tty_port_shutdown()  local
660 	free_irq(bc->tx_irq, bc);  in ehv_bc_tty_port_shutdown()
661 	free_irq(bc->rx_irq, bc);  in ehv_bc_tty_port_shutdown()
672 	struct ehv_bc_data *bc;  in ehv_bc_tty_probe()  local
692 	bc = &bcs[i];  in ehv_bc_tty_probe()
694 	bc->handle = handle;  in ehv_bc_tty_probe()
695 	bc->head = 0;  in ehv_bc_tty_probe()
696 	bc->tail = 0;  in ehv_bc_tty_probe()
697 	spin_lock_init(&bc->lock);  in ehv_bc_tty_probe()
699 	bc->rx_irq = irq_of_parse_and_map(np, 0);  in ehv_bc_tty_probe()
700 	bc->tx_irq = irq_of_parse_and_map(np, 1);  in ehv_bc_tty_probe()
701 	if (!bc->rx_irq || !bc->tx_irq) {  in ehv_bc_tty_probe()
708 	tty_port_init(&bc->port);  in ehv_bc_tty_probe()
709 	bc->port.ops = &ehv_bc_tty_port_ops;  in ehv_bc_tty_probe()
711 	bc->dev = tty_port_register_device(&bc->port, ehv_bc_driver, i,  in ehv_bc_tty_probe()
713 	if (IS_ERR(bc->dev)) {  in ehv_bc_tty_probe()
714 		ret = PTR_ERR(bc->dev);  in ehv_bc_tty_probe()
719 	dev_set_drvdata(&pdev->dev, bc);  in ehv_bc_tty_probe()
722 		ehv_bc_driver->name, i, bc->handle);  in ehv_bc_tty_probe()
727 	tty_port_destroy(&bc->port);  in ehv_bc_tty_probe()
728 	irq_dispose_mapping(bc->tx_irq);  in ehv_bc_tty_probe()
729 	irq_dispose_mapping(bc->rx_irq);  in ehv_bc_tty_probe()
731 	memset(bc, 0, sizeof(struct ehv_bc_data));  in ehv_bc_tty_probe()
742 		.name = "ehv-bc",
772 	 * array, then you can use pointer math (e.g. "bc - bcs") to get its  in ehv_bc_init()
786 	driver->driver_name = "ehv-bc";  in ehv_bc_init()
795 		pr_err("ehv-bc: could not register tty driver (ret=%i)\n", ret);  in ehv_bc_init()
803 		pr_err("ehv-bc: could not register platform driver (ret=%i)\n",  in ehv_bc_init()