45 /* Microseconds that thread will delay waiting for a vcc port ref */
107  * vcc_table_add() - Add VCC port to the VCC table
108  * @port: pointer to the VCC port
110  * Return: index of the port in the VCC table on success,
113 static int vcc_table_add(struct vcc_port *port)  in vcc_table_add()  argument
121 			vcc_table[i] = port;  in vcc_table_add()
134  * vcc_table_remove() - Removes a VCC port from the VCC table
150  * vcc_get() - Gets a reference to VCC port
154  * Return: reference to the VCC port, if found
155  *	   NULL, if port not found
159 	struct vcc_port *port;  in vcc_get()  local
165 	port = vcc_table[index];  in vcc_get()
166 	if (!port) {  in vcc_get()
172 		if (port->excl_locked) {  in vcc_get()
177 		port->refcnt++;  in vcc_get()
179 		return port;  in vcc_get()
182 	if (port->refcnt) {  in vcc_get()
192 	port->refcnt++;  in vcc_get()
193 	port->excl_locked = true;  in vcc_get()
196 	return port;  in vcc_get()
200  * vcc_put() - Returns a reference to VCC port
201  * @port: pointer to VCC port
207 static void vcc_put(struct vcc_port *port, bool excl)  in vcc_put()  argument
211 	if (!port)  in vcc_put()
217 	if (WARN_ON((excl && !port->excl_locked) ||  in vcc_put()
218 		    (!excl && port->excl_locked)))  in vcc_put()
221 	port->refcnt--;  in vcc_put()
224 		port->excl_locked = false;  in vcc_put()
231  * vcc_get_ne() - Get a non-exclusive reference to VCC port
234  * Gets a non-exclusive reference to VCC port, if it's not removed
236  * Return: pointer to the VCC port, if found
237  *	   NULL, if port not found
241 	struct vcc_port *port;  in vcc_get_ne()  local
243 	port = vcc_get(index, false);  in vcc_get_ne()
245 	if (port && port->removed) {  in vcc_get_ne()
246 		vcc_put(port, false);  in vcc_get_ne()
250 	return port;  in vcc_get_ne()
253 static void vcc_kick_rx(struct vcc_port *port)  in vcc_kick_rx()  argument
255 	struct vio_driver_state *vio = &port->vio;  in vcc_kick_rx()
257 	assert_spin_locked(&port->lock);  in vcc_kick_rx()
259 	if (!timer_pending(&port->rx_timer) && !port->removed) {  in vcc_kick_rx()
261 		port->rx_timer.expires = (jiffies + 1);  in vcc_kick_rx()
262 		add_timer(&port->rx_timer);  in vcc_kick_rx()
266 static void vcc_kick_tx(struct vcc_port *port)  in vcc_kick_tx()  argument
268 	assert_spin_locked(&port->lock);  in vcc_kick_tx()
270 	if (!timer_pending(&port->tx_timer) && !port->removed) {  in vcc_kick_tx()
271 		port->tx_timer.expires = (jiffies + 1);  in vcc_kick_tx()
272 		add_timer(&port->tx_timer);  in vcc_kick_tx()
278 	if (WARN_ON(!tty || !tty->port))  in vcc_rx_check()
285 	    (tty_buffer_request_room(tty->port, VCC_BUFF_LEN) < VCC_BUFF_LEN))  in vcc_rx_check()
295 	if (WARN_ON(!tty || !tty->port))  in vcc_rx()
298 	len = tty_insert_flip_string(tty->port, buf, size);  in vcc_rx()
300 		tty_flip_buffer_push(tty->port);  in vcc_rx()
305 static int vcc_ldc_read(struct vcc_port *port)  in vcc_ldc_read()  argument
307 	struct vio_driver_state *vio = &port->vio;  in vcc_ldc_read()
312 	tty = port->tty;  in vcc_ldc_read()
322 			vcc_kick_rx(port);  in vcc_ldc_read()
358 	struct vcc_port *port = from_timer(port, t, rx_timer);  in vcc_rx_timer()  local
363 	spin_lock_irqsave(&port->lock, flags);  in vcc_rx_timer()
364 	port->rx_timer.expires = 0;  in vcc_rx_timer()
366 	vio = &port->vio;  in vcc_rx_timer()
370 	if (!port->tty || port->removed)  in vcc_rx_timer()
373 	rv = vcc_ldc_read(port);  in vcc_rx_timer()
378 	spin_unlock_irqrestore(&port->lock, flags);  in vcc_rx_timer()
379 	vcc_put(port, false);  in vcc_rx_timer()
384 	struct vcc_port *port = from_timer(port, t, tx_timer);  in vcc_tx_timer()  local
390 	spin_lock_irqsave(&port->lock, flags);  in vcc_tx_timer()
391 	port->tx_timer.expires = 0;  in vcc_tx_timer()
393 	if (!port->tty || port->removed)  in vcc_tx_timer()
396 	tosend = min(VCC_BUFF_LEN, port->chars_in_buffer);  in vcc_tx_timer()
400 	pkt = &port->buffer;  in vcc_tx_timer()
403 	vccdbgl(port->vio.lp);  in vcc_tx_timer()
405 	rv = ldc_write(port->vio.lp, pkt, (VIO_TAG_SIZE + tosend));  in vcc_tx_timer()
410 		vcc_kick_tx(port);  in vcc_tx_timer()
412 		struct tty_struct *tty = port->tty;  in vcc_tx_timer()
414 		port->chars_in_buffer = 0;  in vcc_tx_timer()
420 	spin_unlock_irqrestore(&port->lock, flags);  in vcc_tx_timer()
421 	vcc_put(port, false);  in vcc_tx_timer()
434 	struct vcc_port *port;  in vcc_event()  local
438 	port = arg;  in vcc_event()
439 	vio = &port->vio;  in vcc_event()
441 	spin_lock_irqsave(&port->lock, flags);  in vcc_event()
450 		rv = vcc_ldc_read(port);  in vcc_event()
459 	spin_unlock_irqrestore(&port->lock, flags);  in vcc_event()
480 	struct vcc_port *port;  in domain_show()  local
483 	port = dev_get_drvdata(dev);  in domain_show()
484 	if (!port)  in domain_show()
487 	rv = scnprintf(buf, PAGE_SIZE, "%s\n", port->domain);  in domain_show()
492 static int vcc_send_ctl(struct vcc_port *port, int ctl)  in vcc_send_ctl()  argument
501 	rv = ldc_write(port->vio.lp, &pkt, sizeof(pkt.tag));  in vcc_send_ctl()
512 	struct vcc_port *port;  in break_store()  local
517 	port = dev_get_drvdata(dev);  in break_store()
518 	if (!port)  in break_store()
521 	spin_lock_irqsave(&port->lock, flags);  in break_store()
525 	else if (vcc_send_ctl(port, VCC_CTL_BREAK) < 0)  in break_store()
526 		vcc_kick_tx(port);  in break_store()
528 	spin_unlock_irqrestore(&port->lock, flags);  in break_store()
548  * vcc_probe() - Initialize VCC port
549  * @vdev: Pointer to VIO device of the new VCC port
552  * Initializes a VCC port to receive serial console data from
562 	struct vcc_port *port;  in vcc_probe()  local
576 	port = kzalloc(sizeof(struct vcc_port), GFP_KERNEL);  in vcc_probe()
577 	if (!port)  in vcc_probe()
582 	rv = vio_driver_init(&port->vio, vdev, VDEV_CONSOLE_CON, vcc_versions,  in vcc_probe()
587 	port->vio.debug = vcc_dbg_vio;  in vcc_probe()
590 	rv = vio_ldc_alloc(&port->vio, &vcc_ldc_cfg, port);  in vcc_probe()
594 	spin_lock_init(&port->lock);  in vcc_probe()
596 	port->index = vcc_table_add(port);  in vcc_probe()
597 	if (port->index == -1) {  in vcc_probe()
604 	dev = tty_register_device(vcc_tty_driver, port->index, &vdev->dev);  in vcc_probe()
625 	port->domain = kstrdup(domain, GFP_KERNEL);  in vcc_probe()
633 	timer_setup(&port->rx_timer, vcc_rx_timer, 0);  in vcc_probe()
634 	timer_setup(&port->tx_timer, vcc_tx_timer, 0);  in vcc_probe()
636 	dev_set_drvdata(&vdev->dev, port);  in vcc_probe()
639 	 * IRQs until the port is up.  in vcc_probe()
642 	vio_port_up(&port->vio);  in vcc_probe()
648 	kfree(port->domain);  in vcc_probe()
650 	tty_unregister_device(vcc_tty_driver, port->index);  in vcc_probe()
652 	vcc_table_remove(port->index);  in vcc_probe()
654 	vio_ldc_free(&port->vio);  in vcc_probe()
657 	kfree(port);  in vcc_probe()
663  * vcc_remove() - Terminate a VCC port
664  * @vdev: Pointer to VIO device of the VCC port
666  * Terminates a VCC port. Sets up the teardown of TTY and
673 	struct vcc_port *port = dev_get_drvdata(&vdev->dev);  in vcc_remove()  local
675 	del_timer_sync(&port->rx_timer);  in vcc_remove()
676 	del_timer_sync(&port->tx_timer);  in vcc_remove()
682 	if (port->tty)  in vcc_remove()
683 		tty_vhangup(port->tty);  in vcc_remove()
686 	 * clients to this port. This cannot fail.  in vcc_remove()
688 	vcc_get(port->index, true);  in vcc_remove()
690 	tty_unregister_device(vcc_tty_driver, port->index);  in vcc_remove()
692 	del_timer_sync(&port->vio.timer);  in vcc_remove()
693 	vio_ldc_free(&port->vio);  in vcc_remove()
696 	if (port->tty) {  in vcc_remove()
697 		port->removed = true;  in vcc_remove()
698 		vcc_put(port, true);  in vcc_remove()
700 		vcc_table_remove(port->index);  in vcc_remove()
702 		kfree(port->vio.name);  in vcc_remove()
703 		kfree(port->domain);  in vcc_remove()
704 		kfree(port);  in vcc_remove()
710 		.type = "vcc-port",
725 	struct vcc_port *port;  in vcc_open()  local
730 	port = vcc_get_ne(tty->index);  in vcc_open()
731 	if (unlikely(!port)) {  in vcc_open()
732 		pr_err("VCC: open: Failed to find VCC port\n");  in vcc_open()
736 	if (unlikely(!port->vio.lp)) {  in vcc_open()
738 		vcc_put(port, false);  in vcc_open()
741 	vccdbgl(port->vio.lp);  in vcc_open()
743 	vcc_put(port, false);  in vcc_open()
745 	if (unlikely(!tty->port)) {  in vcc_open()
746 		pr_err("VCC: open: TTY port not found\n");  in vcc_open()
750 	if (unlikely(!tty->port->ops)) {  in vcc_open()
755 	return tty_port_open(tty->port, tty, vcc_file);  in vcc_open()
763 	if (unlikely(!tty->port)) {  in vcc_close()
764 		pr_err("VCC: close: TTY port not found\n");  in vcc_close()
768 	tty_port_close(tty->port, tty, vcc_file);  in vcc_close()
771 static void vcc_ldc_hup(struct vcc_port *port)  in vcc_ldc_hup()  argument
775 	spin_lock_irqsave(&port->lock, flags);  in vcc_ldc_hup()
777 	if (vcc_send_ctl(port, VCC_CTL_HUP) < 0)  in vcc_ldc_hup()
778 		vcc_kick_tx(port);  in vcc_ldc_hup()
780 	spin_unlock_irqrestore(&port->lock, flags);  in vcc_ldc_hup()
785 	struct vcc_port *port;  in vcc_hangup()  local
787 	port = vcc_get_ne(tty->index);  in vcc_hangup()
788 	if (unlikely(!port)) {  in vcc_hangup()
789 		pr_err("VCC: hangup: Failed to find VCC port\n");  in vcc_hangup()
793 	if (unlikely(!tty->port)) {  in vcc_hangup()
794 		pr_err("VCC: hangup: TTY port not found\n");  in vcc_hangup()
795 		vcc_put(port, false);  in vcc_hangup()
799 	vcc_ldc_hup(port);  in vcc_hangup()
801 	vcc_put(port, false);  in vcc_hangup()
803 	tty_port_hangup(tty->port);  in vcc_hangup()
809 	struct vcc_port *port;  in vcc_write()  local
816 	port = vcc_get_ne(tty->index);  in vcc_write()
817 	if (unlikely(!port)) {  in vcc_write()
818 		pr_err("VCC: write: Failed to find VCC port");  in vcc_write()
822 	spin_lock_irqsave(&port->lock, flags);  in vcc_write()
824 	pkt = &port->buffer;  in vcc_write()
829 		tosend = min(count, (VCC_BUFF_LEN - port->chars_in_buffer));  in vcc_write()
834 		memcpy(&pkt->data[port->chars_in_buffer], &buf[total_sent],  in vcc_write()
836 		port->chars_in_buffer += tosend;  in vcc_write()
842 		vccdbgl(port->vio.lp);  in vcc_write()
848 		rv = ldc_write(port->vio.lp, pkt, (VIO_TAG_SIZE + tosend));  in vcc_write()
855 			vcc_kick_tx(port);  in vcc_write()
859 		port->chars_in_buffer = 0;  in vcc_write()
862 	spin_unlock_irqrestore(&port->lock, flags);  in vcc_write()
864 	vcc_put(port, false);  in vcc_write()
873 	struct vcc_port *port;  in vcc_write_room()  local
876 	port = vcc_get_ne(tty->index);  in vcc_write_room()
877 	if (unlikely(!port)) {  in vcc_write_room()
878 		pr_err("VCC: write_room: Failed to find VCC port\n");  in vcc_write_room()
882 	num = VCC_BUFF_LEN - port->chars_in_buffer;  in vcc_write_room()
884 	vcc_put(port, false);  in vcc_write_room()
891 	struct vcc_port *port;  in vcc_chars_in_buffer()  local
894 	port = vcc_get_ne(tty->index);  in vcc_chars_in_buffer()
895 	if (unlikely(!port)) {  in vcc_chars_in_buffer()
896 		pr_err("VCC: chars_in_buffer: Failed to find VCC port\n");  in vcc_chars_in_buffer()
900 	num = port->chars_in_buffer;  in vcc_chars_in_buffer()
902 	vcc_put(port, false);  in vcc_chars_in_buffer()
909 	struct vcc_port *port;  in vcc_break_ctl()  local
912 	port = vcc_get_ne(tty->index);  in vcc_break_ctl()
913 	if (unlikely(!port)) {  in vcc_break_ctl()
914 		pr_err("VCC: break_ctl: Failed to find VCC port\n");  in vcc_break_ctl()
920 		vcc_put(port, false);  in vcc_break_ctl()
924 	spin_lock_irqsave(&port->lock, flags);  in vcc_break_ctl()
926 	if (vcc_send_ctl(port, VCC_CTL_BREAK) < 0)  in vcc_break_ctl()
927 		vcc_kick_tx(port);  in vcc_break_ctl()
929 	spin_unlock_irqrestore(&port->lock, flags);  in vcc_break_ctl()
931 	vcc_put(port, false);  in vcc_break_ctl()
955 		pr_err("VCC: install: Failed to find VCC port\n");  in vcc_install()
956 		tty->port = NULL;  in vcc_install()
963 	tty->port = port_tty;  in vcc_install()
974 	struct vcc_port *port;  in vcc_cleanup()  local
976 	port = vcc_get(tty->index, true);  in vcc_cleanup()
977 	if (port) {  in vcc_cleanup()
978 		port->tty = NULL;  in vcc_cleanup()
980 		if (port->removed) {  in vcc_cleanup()
982 			kfree(port->vio.name);  in vcc_cleanup()
983 			kfree(port->domain);  in vcc_cleanup()
984 			kfree(port);  in vcc_cleanup()
986 			vcc_put(port, true);  in vcc_cleanup()
990 	tty_port_destroy(tty->port);  in vcc_cleanup()
991 	kfree(tty->port);  in vcc_cleanup()
992 	tty->port = NULL;  in vcc_cleanup()