1 // SPDX-License-Identifier: GPL-2.0
3  * MEN 16z135 High Speed UART
104 MODULE_PARM_DESC(txlvl, "TX IRQ trigger level 0-7, default 5 (128 byte)");
108 MODULE_PARM_DESC(rxlvl, "RX IRQ trigger level 0-7, default 6 (256 byte)");
131  * men_z135_reg_set() - Set value in register
132  * @uart: The UART port
136 static inline void men_z135_reg_set(struct men_z135_port *uart,  in men_z135_reg_set()  argument
139 	struct uart_port *port = &uart->port;  in men_z135_reg_set()
143 	spin_lock_irqsave(&uart->lock, flags);  in men_z135_reg_set()
145 	reg = ioread32(port->membase + addr);  in men_z135_reg_set()
147 	iowrite32(reg, port->membase + addr);  in men_z135_reg_set()
149 	spin_unlock_irqrestore(&uart->lock, flags);  in men_z135_reg_set()
153  * men_z135_reg_clr() - Unset value in register
154  * @uart: The UART port
158 static void men_z135_reg_clr(struct men_z135_port *uart,  in men_z135_reg_clr()  argument
161 	struct uart_port *port = &uart->port;  in men_z135_reg_clr()
165 	spin_lock_irqsave(&uart->lock, flags);  in men_z135_reg_clr()
167 	reg = ioread32(port->membase + addr);  in men_z135_reg_clr()
169 	iowrite32(reg, port->membase + addr);  in men_z135_reg_clr()
171 	spin_unlock_irqrestore(&uart->lock, flags);  in men_z135_reg_clr()
175  * men_z135_handle_modem_status() - Handle change of modem status
176  * @uart: The UART port
181 static void men_z135_handle_modem_status(struct men_z135_port *uart)  in men_z135_handle_modem_status()  argument
185 	msr = (uart->stat_reg >> 8) & 0xff;  in men_z135_handle_modem_status()
188 		uart_handle_dcd_change(&uart->port,  in men_z135_handle_modem_status()
191 		uart_handle_cts_change(&uart->port,  in men_z135_handle_modem_status()
195 static void men_z135_handle_lsr(struct men_z135_port *uart)  in men_z135_handle_lsr()  argument
197 	struct uart_port *port = &uart->port;  in men_z135_handle_lsr()
200 	lsr = (uart->stat_reg >> 16) & 0xff;  in men_z135_handle_lsr()
203 		port->icount.overrun++;  in men_z135_handle_lsr()
205 		port->icount.parity++;  in men_z135_handle_lsr()
207 		port->icount.frame++;  in men_z135_handle_lsr()
209 		port->icount.brk++;  in men_z135_handle_lsr()
215  * get_rx_fifo_content() - Get the number of bytes in RX FIFO
216  * @uart: The UART port
220 static u16 get_rx_fifo_content(struct men_z135_port *uart)  in get_rx_fifo_content()  argument
222 	struct uart_port *port = &uart->port;  in get_rx_fifo_content()
228 	stat_reg = ioread32(port->membase + MEN_Z135_STAT_REG);  in get_rx_fifo_content()
238  * men_z135_handle_rx() - RX tasklet routine
239  * @uart: Pointer to struct men_z135_port
243 static void men_z135_handle_rx(struct men_z135_port *uart)  in men_z135_handle_rx()  argument
245 	struct uart_port *port = &uart->port;  in men_z135_handle_rx()
246 	struct tty_port *tport = &port->state->port;  in men_z135_handle_rx()
251 	size = get_rx_fifo_content(uart);  in men_z135_handle_rx()
257 	 * longword in RX FIFO cannot be read.(0x004-0x3FF)  in men_z135_handle_rx()
264 		dev_warn(&uart->mdev->dev,  in men_z135_handle_rx()
271 	memcpy_fromio(uart->rxbuf, port->membase + MEN_Z135_RX_RAM, room);  in men_z135_handle_rx()
274 	iowrite32(room, port->membase +  MEN_Z135_RX_CTRL);  in men_z135_handle_rx()
276 	copied = tty_insert_flip_string(tport, uart->rxbuf, room);  in men_z135_handle_rx()
278 		dev_warn(&uart->mdev->dev,  in men_z135_handle_rx()
282 	port->icount.rx += copied;  in men_z135_handle_rx()
289  * men_z135_handle_tx() - TX tasklet routine
290  * @uart: Pointer to struct men_z135_port
293 static void men_z135_handle_tx(struct men_z135_port *uart)  in men_z135_handle_tx()  argument
295 	struct uart_port *port = &uart->port;  in men_z135_handle_tx()
296 	struct circ_buf *xmit = &port->state->xmit;  in men_z135_handle_tx()
312 	if (port->x_char)  in men_z135_handle_tx()
320 	wptr = ioread32(port->membase + MEN_Z135_TX_CTRL);  in men_z135_handle_tx()
327 	txfree = MEN_Z135_FIFO_WATERMARK - txc;  in men_z135_handle_tx()
329 		dev_err(&uart->mdev->dev,  in men_z135_handle_tx()
339 		n = 4 - BYTES_TO_ALIGN(wptr);  in men_z135_handle_tx()
348 	head = xmit->head & (UART_XMIT_SIZE - 1);  in men_z135_handle_tx()
349 	tail = xmit->tail & (UART_XMIT_SIZE - 1);  in men_z135_handle_tx()
351 	s = ((head >= tail) ? head : UART_XMIT_SIZE) - tail;  in men_z135_handle_tx()
354 	memcpy_toio(port->membase + MEN_Z135_TX_RAM, &xmit->buf[xmit->tail], n);  in men_z135_handle_tx()
355 	xmit->tail = (xmit->tail + n) & (UART_XMIT_SIZE - 1);  in men_z135_handle_tx()
357 	iowrite32(n & 0x3ff, port->membase + MEN_Z135_TX_CTRL);  in men_z135_handle_tx()
359 	port->icount.tx += n;  in men_z135_handle_tx()
366 		men_z135_reg_set(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_TXCIEN);  in men_z135_handle_tx()
368 		men_z135_reg_clr(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_TXCIEN);  in men_z135_handle_tx()
376  * men_z135_intr() - Handle legacy IRQs
378  * @data: Pointer to UART port
387 	struct men_z135_port *uart = (struct men_z135_port *)data;  in men_z135_intr()  local
388 	struct uart_port *port = &uart->port;  in men_z135_intr()
392 	uart->stat_reg = ioread32(port->membase + MEN_Z135_STAT_REG);  in men_z135_intr()
393 	irq_id = IRQ_ID(uart->stat_reg);  in men_z135_intr()
398 	spin_lock(&port->lock);  in men_z135_intr()
400 	iowrite8(irq_id, port->membase + MEN_Z135_STAT_REG);  in men_z135_intr()
403 		men_z135_handle_lsr(uart);  in men_z135_intr()
409 			dev_dbg(&uart->mdev->dev, "Character Timeout Indication\n");  in men_z135_intr()
410 		men_z135_handle_rx(uart);  in men_z135_intr()
415 		men_z135_handle_tx(uart);  in men_z135_intr()
420 		men_z135_handle_modem_status(uart);  in men_z135_intr()
424 	spin_unlock(&port->lock);  in men_z135_intr()
430  * men_z135_request_irq() - Request IRQ for 16z135 core
431  * @uart: z135 private uart port structure
436 static int men_z135_request_irq(struct men_z135_port *uart)  in men_z135_request_irq()  argument
438 	struct device *dev = &uart->mdev->dev;  in men_z135_request_irq()
439 	struct uart_port *port = &uart->port;  in men_z135_request_irq()
442 	err = request_irq(port->irq, men_z135_intr, IRQF_SHARED,  in men_z135_request_irq()
443 			"men_z135_intr", uart);  in men_z135_request_irq()
451  * men_z135_tx_empty() - Handle tx_empty call
452  * @port: The UART port
462 	wptr = ioread32(port->membase + MEN_Z135_TX_CTRL);  in men_z135_tx_empty()
472  * men_z135_set_mctrl() - Set modem control lines
473  * @port: The UART port
484 	conf_reg = old = ioread32(port->membase + MEN_Z135_CONF_REG);  in men_z135_set_mctrl()
511 		iowrite32(conf_reg, port->membase + MEN_Z135_CONF_REG);  in men_z135_set_mctrl()
515  * men_z135_get_mctrl() - Get modem control lines
516  * @port: The UART port
525 	msr = ioread8(port->membase + MEN_Z135_STAT_REG + 1);  in men_z135_get_mctrl()
540  * men_z135_stop_tx() - Stop transmitting characters
541  * @port: The UART port
549 	struct men_z135_port *uart = to_men_z135(port);  in men_z135_stop_tx()  local
551 	men_z135_reg_clr(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_TXCIEN);  in men_z135_stop_tx()
555  * men_z135_disable_ms() - Disable Modem Status
556  * port: The UART port
562 	struct men_z135_port *uart = to_men_z135(port);  in men_z135_disable_ms()  local
564 	men_z135_reg_clr(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_MSIEN);  in men_z135_disable_ms()
568  * men_z135_start_tx() - Start transmitting characters
569  * @port: The UART port
576 	struct men_z135_port *uart = to_men_z135(port);  in men_z135_start_tx()  local
578 	if (uart->automode)  in men_z135_start_tx()
581 	men_z135_handle_tx(uart);  in men_z135_start_tx()
585  * men_z135_stop_rx() - Stop receiving characters
586  * @port: The UART port
592 	struct men_z135_port *uart = to_men_z135(port);  in men_z135_stop_rx()  local
594 	men_z135_reg_clr(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_RXCIEN);  in men_z135_stop_rx()
598  * men_z135_enable_ms() - Enable Modem Status
605 	struct men_z135_port *uart = to_men_z135(port);  in men_z135_enable_ms()  local
607 	men_z135_reg_set(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_MSIEN);  in men_z135_enable_ms()
612 	struct men_z135_port *uart = to_men_z135(port);  in men_z135_startup()  local
616 	err = men_z135_request_irq(uart);  in men_z135_startup()
618 		return -ENODEV;  in men_z135_startup()
620 	conf_reg = ioread32(port->membase + MEN_Z135_CONF_REG);  in men_z135_startup()
628 	iowrite32(conf_reg, port->membase + MEN_Z135_CONF_REG);  in men_z135_startup()
631 		iowrite32(rx_timeout, port->membase + MEN_Z135_TIMEOUT);  in men_z135_startup()
638 	struct men_z135_port *uart = to_men_z135(port);  in men_z135_shutdown()  local
643 	men_z135_reg_clr(uart, MEN_Z135_CONF_REG, conf_reg);  in men_z135_shutdown()
645 	free_irq(uart->port.irq, uart);  in men_z135_shutdown()
652 	struct men_z135_port *uart = to_men_z135(port);  in men_z135_set_termios()  local
659 	conf_reg = ioread32(port->membase + MEN_Z135_CONF_REG);  in men_z135_set_termios()
663 	switch (termios->c_cflag & CSIZE) {  in men_z135_set_termios()
679 	if (termios->c_cflag & CSTOPB)  in men_z135_set_termios()
683 	if (termios->c_cflag & PARENB) {  in men_z135_set_termios()
686 		if (termios->c_cflag & PARODD)  in men_z135_set_termios()
694 	if (termios->c_cflag & CRTSCTS) {  in men_z135_set_termios()
696 		uart->automode = true;  in men_z135_set_termios()
697 		termios->c_cflag &= ~CLOCAL;  in men_z135_set_termios()
700 		uart->automode = false;  in men_z135_set_termios()
703 	termios->c_cflag &= ~CMSPAR; /* Mark/Space parity is not supported */  in men_z135_set_termios()
706 	iowrite32(conf_reg, port->membase + MEN_Z135_CONF_REG);  in men_z135_set_termios()
708 	uart_freq = ioread32(port->membase + MEN_Z135_UART_FREQ);  in men_z135_set_termios()
714 	spin_lock_irq(&port->lock);  in men_z135_set_termios()
719 	iowrite32(bd_reg, port->membase + MEN_Z135_BAUD_REG);  in men_z135_set_termios()
721 	uart_update_timeout(port, termios->c_cflag, baud);  in men_z135_set_termios()
722 	spin_unlock_irq(&port->lock);  in men_z135_set_termios()
732 	struct men_z135_port *uart = to_men_z135(port);  in men_z135_release_port()  local
734 	iounmap(port->membase);  in men_z135_release_port()
735 	port->membase = NULL;  in men_z135_release_port()
737 	mcb_release_mem(uart->mem);  in men_z135_release_port()
742 	struct men_z135_port *uart = to_men_z135(port);  in men_z135_request_port()  local
743 	struct mcb_device *mdev = uart->mdev;  in men_z135_request_port()
746 	mem = mcb_request_mem(uart->mdev, dev_name(&mdev->dev));  in men_z135_request_port()
750 	port->mapbase = mem->start;  in men_z135_request_port()
751 	uart->mem = mem;  in men_z135_request_port()
753 	port->membase = ioremap(mem->start, resource_size(mem));  in men_z135_request_port()
754 	if (port->membase == NULL) {  in men_z135_request_port()
756 		return -ENOMEM;  in men_z135_request_port()
764 	port->type = PORT_MEN_Z135;  in men_z135_config_port()
771 	return -EINVAL;  in men_z135_verify_port()
802  * men_z135_probe() - Probe a z135 instance
807  * new uart port to the tty layer.
812 	struct men_z135_port *uart;  in men_z135_probe()  local
817 	dev = &mdev->dev;  in men_z135_probe()
819 	uart = devm_kzalloc(dev, sizeof(struct men_z135_port), GFP_KERNEL);  in men_z135_probe()
820 	if (!uart)  in men_z135_probe()
821 		return -ENOMEM;  in men_z135_probe()
823 	uart->rxbuf = (unsigned char *)__get_free_page(GFP_KERNEL);  in men_z135_probe()
824 	if (!uart->rxbuf)  in men_z135_probe()
825 		return -ENOMEM;  in men_z135_probe()
827 	mem = &mdev->mem;  in men_z135_probe()
829 	mcb_set_drvdata(mdev, uart);  in men_z135_probe()
831 	uart->port.uartclk = MEN_Z135_BASECLK * 16;  in men_z135_probe()
832 	uart->port.fifosize = MEN_Z135_FIFO_SIZE;  in men_z135_probe()
833 	uart->port.iotype = UPIO_MEM;  in men_z135_probe()
834 	uart->port.ops = &men_z135_ops;  in men_z135_probe()
835 	uart->port.irq = mcb_get_irq(mdev);  in men_z135_probe()
836 	uart->port.flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP;  in men_z135_probe()
837 	uart->port.line = line++;  in men_z135_probe()
838 	uart->port.dev = dev;  in men_z135_probe()
839 	uart->port.type = PORT_MEN_Z135;  in men_z135_probe()
840 	uart->port.mapbase = mem->start;  in men_z135_probe()
841 	uart->port.membase = NULL;  in men_z135_probe()
842 	uart->mdev = mdev;  in men_z135_probe()
844 	spin_lock_init(&uart->lock);  in men_z135_probe()
846 	err = uart_add_one_port(&men_z135_driver, &uart->port);  in men_z135_probe()
853 	free_page((unsigned long) uart->rxbuf);  in men_z135_probe()
854 	dev_err(dev, "Failed to add UART: %d\n", err);  in men_z135_probe()
860  * men_z135_remove() - Remove a z135 instance from the system
866 	struct men_z135_port *uart = mcb_get_drvdata(mdev);  in men_z135_remove()  local
868 	line--;  in men_z135_remove()
869 	uart_remove_one_port(&men_z135_driver, &uart->port);  in men_z135_remove()
870 	free_page((unsigned long) uart->rxbuf);  in men_z135_remove()
881 		.name = "z135-uart",
890  * men_z135_init() - Driver Registration Routine
901 		pr_err("Failed to register UART: %d\n", err);  in men_z135_init()
917  * men_z135_exit() - Driver Exit Routine
930 MODULE_DESCRIPTION("MEN 16z135 High Speed UART");