1 // SPDX-License-Identifier: GPL-2.0
12 #include <linux/interrupt.h>
40 #define MEN_Z135_IER_MSIEN  BIT(3)		/* Modem Status IRQ */
73 #define MEN_Z135_PEN_SHIFT 3	/* Parity enable */
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
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
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
178  * Handle change of modem status register. This is done by reading the "delta"
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()
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
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
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()
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
295 	struct uart_port *port = &uart->port;  in men_z135_handle_tx()
296 	struct tty_port *tport = &port->state->port;  in men_z135_handle_tx()
303 	if (kfifo_is_empty(&tport->xmit_fifo))  in men_z135_handle_tx()
309 	if (port->x_char)  in men_z135_handle_tx()
313 	qlen = kfifo_len(&tport->xmit_fifo);  in men_z135_handle_tx()
317 	wptr = ioread32(port->membase + MEN_Z135_TX_CTRL);  in men_z135_handle_tx()
324 	txfree = MEN_Z135_FIFO_WATERMARK - txc;  in men_z135_handle_tx()
326 		dev_err(&uart->mdev->dev,  in men_z135_handle_tx()
336 		n = 4 - BYTES_TO_ALIGN(wptr);  in men_z135_handle_tx()
345 	n = kfifo_out_linear_ptr(&tport->xmit_fifo, &tail,  in men_z135_handle_tx()
347 	memcpy_toio(port->membase + MEN_Z135_TX_RAM, tail, n);  in men_z135_handle_tx()
349 	iowrite32(n & 0x3ff, port->membase + MEN_Z135_TX_CTRL);  in men_z135_handle_tx()
352 	if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)  in men_z135_handle_tx()
356 	if (!kfifo_is_empty(&tport->xmit_fifo))  in men_z135_handle_tx()
367  * men_z135_intr() - Handle legacy IRQs
371  * Check IIR register to find the cause of the interrupt and handle it.
379 	struct uart_port *port = &uart->port;  in men_z135_intr()
383 	uart->stat_reg = ioread32(port->membase + MEN_Z135_STAT_REG);  in men_z135_intr()
384 	irq_id = IRQ_ID(uart->stat_reg);  in men_z135_intr()
391 	iowrite8(irq_id, port->membase + MEN_Z135_STAT_REG);  in men_z135_intr()
400 			dev_dbg(&uart->mdev->dev, "Character Timeout Indication\n");  in men_z135_intr()
421  * men_z135_request_irq() - Request IRQ for 16z135 core
429 	struct device *dev = &uart->mdev->dev;  in men_z135_request_irq()
430 	struct uart_port *port = &uart->port;  in men_z135_request_irq()
433 	err = request_irq(port->irq, men_z135_intr, IRQF_SHARED,  in men_z135_request_irq()
436 		dev_err(dev, "Error %d getting interrupt\n", err);  in men_z135_request_irq()
442  * men_z135_tx_empty() - Handle tx_empty call
453 	wptr = ioread32(port->membase + MEN_Z135_TX_CTRL);  in men_z135_tx_empty()
463  * men_z135_set_mctrl() - Set modem control lines
465  * @mctrl: The modem control lines
467  * This function sets the modem control lines for a port described by @port
475 	conf_reg = old = ioread32(port->membase + MEN_Z135_CONF_REG);  in men_z135_set_mctrl()
502 		iowrite32(conf_reg, port->membase + MEN_Z135_CONF_REG);  in men_z135_set_mctrl()
506  * men_z135_get_mctrl() - Get modem control lines
509  * Retruns the current state of modem control inputs.
516 	msr = ioread8(port->membase + MEN_Z135_STAT_REG + 1);  in men_z135_get_mctrl()
531  * men_z135_stop_tx() - Stop transmitting characters
546  * men_z135_disable_ms() - Disable Modem Status
549  * Enable Modem Status IRQ.
559  * men_z135_start_tx() - Start transmitting characters
569 	if (uart->automode)  in men_z135_start_tx()
576  * men_z135_stop_rx() - Stop receiving characters
589  * men_z135_enable_ms() - Enable Modem Status
592  * Enable Modem Status IRQ.
609 		return -ENODEV;  in men_z135_startup()
611 	conf_reg = ioread32(port->membase + MEN_Z135_CONF_REG);  in men_z135_startup()
619 	iowrite32(conf_reg, port->membase + MEN_Z135_CONF_REG);  in men_z135_startup()
622 		iowrite32(rx_timeout, port->membase + MEN_Z135_TIMEOUT);  in men_z135_startup()
636 	free_irq(uart->port.irq, uart);  in men_z135_shutdown()
650 	conf_reg = ioread32(port->membase + MEN_Z135_CONF_REG);  in men_z135_set_termios()
654 	switch (termios->c_cflag & CSIZE) {  in men_z135_set_termios()
670 	if (termios->c_cflag & CSTOPB)  in men_z135_set_termios()
674 	if (termios->c_cflag & PARENB) {  in men_z135_set_termios()
677 		if (termios->c_cflag & PARODD)  in men_z135_set_termios()
685 	if (termios->c_cflag & CRTSCTS) {  in men_z135_set_termios()
687 		uart->automode = true;  in men_z135_set_termios()
688 		termios->c_cflag &= ~CLOCAL;  in men_z135_set_termios()
691 		uart->automode = false;  in men_z135_set_termios()
694 	termios->c_cflag &= ~CMSPAR; /* Mark/Space parity is not supported */  in men_z135_set_termios()
697 	iowrite32(conf_reg, port->membase + MEN_Z135_CONF_REG);  in men_z135_set_termios()
699 	uart_freq = ioread32(port->membase + MEN_Z135_UART_FREQ);  in men_z135_set_termios()
710 	iowrite32(bd_reg, port->membase + MEN_Z135_BAUD_REG);  in men_z135_set_termios()
712 	uart_update_timeout(port, termios->c_cflag, baud);  in men_z135_set_termios()
725 	iounmap(port->membase);  in men_z135_release_port()
726 	port->membase = NULL;  in men_z135_release_port()
728 	mcb_release_mem(uart->mem);  in men_z135_release_port()
734 	struct mcb_device *mdev = uart->mdev;  in men_z135_request_port()
737 	mem = mcb_request_mem(uart->mdev, dev_name(&mdev->dev));  in men_z135_request_port()
741 	port->mapbase = mem->start;  in men_z135_request_port()
742 	uart->mem = mem;  in men_z135_request_port()
744 	port->membase = ioremap(mem->start, resource_size(mem));  in men_z135_request_port()
745 	if (port->membase == NULL) {  in men_z135_request_port()
747 		return -ENOMEM;  in men_z135_request_port()
755 	port->type = PORT_MEN_Z135;  in men_z135_config_port()
762 	return -EINVAL;  in men_z135_verify_port()
793  * men_z135_probe() - Probe a z135 instance
808 	dev = &mdev->dev;  in men_z135_probe()
812 		return -ENOMEM;  in men_z135_probe()
814 	uart->rxbuf = (unsigned char *)__get_free_page(GFP_KERNEL);  in men_z135_probe()
815 	if (!uart->rxbuf)  in men_z135_probe()
816 		return -ENOMEM;  in men_z135_probe()
818 	mem = &mdev->mem;  in men_z135_probe()
822 	uart->port.uartclk = MEN_Z135_BASECLK * 16;  in men_z135_probe()
823 	uart->port.fifosize = MEN_Z135_FIFO_SIZE;  in men_z135_probe()
824 	uart->port.iotype = UPIO_MEM;  in men_z135_probe()
825 	uart->port.ops = &men_z135_ops;  in men_z135_probe()
826 	uart->port.irq = mcb_get_irq(mdev);  in men_z135_probe()
827 	uart->port.flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP;  in men_z135_probe()
828 	uart->port.line = line++;  in men_z135_probe()
829 	uart->port.dev = dev;  in men_z135_probe()
830 	uart->port.type = PORT_MEN_Z135;  in men_z135_probe()
831 	uart->port.mapbase = mem->start;  in men_z135_probe()
832 	uart->port.membase = NULL;  in men_z135_probe()
833 	uart->mdev = mdev;  in men_z135_probe()
835 	spin_lock_init(&uart->lock);  in men_z135_probe()
837 	err = uart_add_one_port(&men_z135_driver, &uart->port);  in men_z135_probe()
844 	free_page((unsigned long) uart->rxbuf);  in men_z135_probe()
851  * men_z135_remove() - Remove a z135 instance from the system
859 	line--;  in men_z135_remove()
860 	uart_remove_one_port(&men_z135_driver, &uart->port);  in men_z135_remove()
861 	free_page((unsigned long) uart->rxbuf);  in men_z135_remove()
872 		.name = "z135-uart",
881  * men_z135_init() - Driver Registration Routine
908  * men_z135_exit() - Driver Exit Routine