1 // SPDX-License-Identifier: GPL-2.0
31 	struct mbox_chan *tx, *rx;  member
53 				unsigned int count)  in tegra_tcu_write_one()  argument
57 	value |= TCU_MBOX_NUM_BYTES(count);  in tegra_tcu_write_one()
59 	mbox_send_message(tcu->tx, msg);  in tegra_tcu_write_one()
60 	mbox_flush(tcu->tx, 1000);  in tegra_tcu_write_one()
64 			    unsigned int count)  in tegra_tcu_write()  argument
70 	while (i < count) {  in tegra_tcu_write()
94 	struct tegra_tcu *tcu = port->private_data;  in tegra_tcu_uart_start_tx()
95 	struct circ_buf *xmit = &port->state->xmit;  in tegra_tcu_uart_start_tx()
96 	unsigned long count;  in tegra_tcu_uart_start_tx()  local
99 		count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);  in tegra_tcu_uart_start_tx()
100 		if (!count)  in tegra_tcu_uart_start_tx()
103 		tegra_tcu_write(tcu, &xmit->buf[xmit->tail], count);  in tegra_tcu_uart_start_tx()
104 		uart_xmit_advance(port, count);  in tegra_tcu_uart_start_tx()
148 				    unsigned int count)  in tegra_tcu_console_write()  argument
152 	tegra_tcu_write(tcu, s, count);  in tegra_tcu_console_write()
164 	struct tty_port *port = &tcu->port.state->port;  in tegra_tcu_receive()
183 	tcu = devm_kzalloc(&pdev->dev, sizeof(*tcu), GFP_KERNEL);  in tegra_tcu_probe()
185 		return -ENOMEM;  in tegra_tcu_probe()
187 	tcu->tx_client.dev = &pdev->dev;  in tegra_tcu_probe()
188 	tcu->rx_client.dev = &pdev->dev;  in tegra_tcu_probe()
189 	tcu->rx_client.rx_callback = tegra_tcu_receive;  in tegra_tcu_probe()
191 	tcu->tx = mbox_request_channel_byname(&tcu->tx_client, "tx");  in tegra_tcu_probe()
192 	if (IS_ERR(tcu->tx)) {  in tegra_tcu_probe()
193 		err = PTR_ERR(tcu->tx);  in tegra_tcu_probe()
194 		dev_err(&pdev->dev, "failed to get tx mailbox: %d\n", err);  in tegra_tcu_probe()
198 	tcu->rx = mbox_request_channel_byname(&tcu->rx_client, "rx");  in tegra_tcu_probe()
199 	if (IS_ERR(tcu->rx)) {  in tegra_tcu_probe()
200 		err = PTR_ERR(tcu->rx);  in tegra_tcu_probe()
201 		dev_err(&pdev->dev, "failed to get rx mailbox: %d\n", err);  in tegra_tcu_probe()
207 	strcpy(tcu->console.name, "ttyTCU");  in tegra_tcu_probe()
208 	tcu->console.device = uart_console_device;  in tegra_tcu_probe()
209 	tcu->console.flags = CON_PRINTBUFFER | CON_ANYTIME;  in tegra_tcu_probe()
210 	tcu->console.index = -1;  in tegra_tcu_probe()
211 	tcu->console.write = tegra_tcu_console_write;  in tegra_tcu_probe()
212 	tcu->console.setup = tegra_tcu_console_setup;  in tegra_tcu_probe()
213 	tcu->console.data = &tcu->driver;  in tegra_tcu_probe()
217 	tcu->driver.owner = THIS_MODULE;  in tegra_tcu_probe()
218 	tcu->driver.driver_name = "tegra-tcu";  in tegra_tcu_probe()
219 	tcu->driver.dev_name = "ttyTCU";  in tegra_tcu_probe()
221 	tcu->driver.cons = &tcu->console;  in tegra_tcu_probe()
223 	tcu->driver.nr = 1;  in tegra_tcu_probe()
225 	err = uart_register_driver(&tcu->driver);  in tegra_tcu_probe()
227 		dev_err(&pdev->dev, "failed to register UART driver: %d\n",  in tegra_tcu_probe()
233 	port = &tcu->port;  in tegra_tcu_probe()
234 	spin_lock_init(&port->lock);  in tegra_tcu_probe()
235 	port->dev = &pdev->dev;  in tegra_tcu_probe()
236 	port->type = PORT_TEGRA_TCU;  in tegra_tcu_probe()
237 	port->ops = &tegra_tcu_uart_ops;  in tegra_tcu_probe()
238 	port->fifosize = 1;  in tegra_tcu_probe()
239 	port->iotype = UPIO_MEM;  in tegra_tcu_probe()
240 	port->flags = UPF_BOOT_AUTOCONF;  in tegra_tcu_probe()
241 	port->private_data = tcu;  in tegra_tcu_probe()
243 	err = uart_add_one_port(&tcu->driver, port);  in tegra_tcu_probe()
245 		dev_err(&pdev->dev, "failed to add UART port: %d\n", err);  in tegra_tcu_probe()
251 	register_console(&tcu->console);  in tegra_tcu_probe()
257 	uart_unregister_driver(&tcu->driver);  in tegra_tcu_probe()
259 	mbox_free_channel(tcu->rx);  in tegra_tcu_probe()
261 	mbox_free_channel(tcu->tx);  in tegra_tcu_probe()
271 	unregister_console(&tcu->console);  in tegra_tcu_remove()
273 	uart_remove_one_port(&tcu->driver, &tcu->port);  in tegra_tcu_remove()
274 	uart_unregister_driver(&tcu->driver);  in tegra_tcu_remove()
275 	mbox_free_channel(tcu->rx);  in tegra_tcu_remove()
276 	mbox_free_channel(tcu->tx);  in tegra_tcu_remove()
282 	{ .compatible = "nvidia,tegra194-tcu" },
288 		.name = "tegra-tcu",