1 // SPDX-License-Identifier: GPL-2.0+
52 static inline unsigned int serial_in(struct uart_pxa_port *up, int offset)  in serial_in()  argument
55 	return readl(up->port.membase + offset);  in serial_in()
58 static inline void serial_out(struct uart_pxa_port *up, int offset, int value)  in serial_out()  argument
61 	writel(value, up->port.membase + offset);  in serial_out()
66 	struct uart_pxa_port *up = (struct uart_pxa_port *)port;  in serial_pxa_enable_ms()  local
68 	up->ier |= UART_IER_MSI;  in serial_pxa_enable_ms()
69 	serial_out(up, UART_IER, up->ier);  in serial_pxa_enable_ms()
74 	struct uart_pxa_port *up = (struct uart_pxa_port *)port;  in serial_pxa_stop_tx()  local
76 	if (up->ier & UART_IER_THRI) {  in serial_pxa_stop_tx()
77 		up->ier &= ~UART_IER_THRI;  in serial_pxa_stop_tx()
78 		serial_out(up, UART_IER, up->ier);  in serial_pxa_stop_tx()
84 	struct uart_pxa_port *up = (struct uart_pxa_port *)port;  in serial_pxa_stop_rx()  local
86 	up->ier &= ~UART_IER_RLSI;  in serial_pxa_stop_rx()
87 	up->port.read_status_mask &= ~UART_LSR_DR;  in serial_pxa_stop_rx()
88 	serial_out(up, UART_IER, up->ier);  in serial_pxa_stop_rx()
91 static inline void receive_chars(struct uart_pxa_port *up, int *status)  in receive_chars()  argument
104 		up->ier &= ~UART_IER_RTOIE;  in receive_chars()
105 		serial_out(up, UART_IER, up->ier);  in receive_chars()
107 		ch = serial_in(up, UART_RX);  in receive_chars()
109 		up->port.icount.rx++;  in receive_chars()
118 				up->port.icount.brk++;  in receive_chars()
125 				if (uart_handle_break(&up->port))  in receive_chars()
128 				up->port.icount.parity++;  in receive_chars()
130 				up->port.icount.frame++;  in receive_chars()
132 				up->port.icount.overrun++;  in receive_chars()
137 			*status &= up->port.read_status_mask;  in receive_chars()
140 			if (up->port.line == up->port.cons->index) {  in receive_chars()
142 				*status |= up->lsr_break_flag;  in receive_chars()
143 				up->lsr_break_flag = 0;  in receive_chars()
154 		if (uart_handle_sysrq_char(&up->port, ch))  in receive_chars()
157 		uart_insert_char(&up->port, *status, UART_LSR_OE, ch, flag);  in receive_chars()
160 		*status = serial_in(up, UART_LSR);  in receive_chars()
161 	} while ((*status & UART_LSR_DR) && (max_count-- > 0));  in receive_chars()
162 	tty_flip_buffer_push(&up->port.state->port);  in receive_chars()
169 	 * No more data in FIFO: Re-enable RTO interrupt via IER[RTOIE]  in receive_chars()
171 	up->ier |= UART_IER_RTOIE;  in receive_chars()
172 	serial_out(up, UART_IER, up->ier);  in receive_chars()
175 static void transmit_chars(struct uart_pxa_port *up)  in transmit_chars()  argument
177 	struct circ_buf *xmit = &up->port.state->xmit;  in transmit_chars()
180 	if (up->port.x_char) {  in transmit_chars()
181 		serial_out(up, UART_TX, up->port.x_char);  in transmit_chars()
182 		up->port.icount.tx++;  in transmit_chars()
183 		up->port.x_char = 0;  in transmit_chars()
186 	if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {  in transmit_chars()
187 		serial_pxa_stop_tx(&up->port);  in transmit_chars()
191 	count = up->port.fifosize / 2;  in transmit_chars()
193 		serial_out(up, UART_TX, xmit->buf[xmit->tail]);  in transmit_chars()
194 		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);  in transmit_chars()
195 		up->port.icount.tx++;  in transmit_chars()
198 	} while (--count > 0);  in transmit_chars()
201 		uart_write_wakeup(&up->port);  in transmit_chars()
205 		serial_pxa_stop_tx(&up->port);  in transmit_chars()
210 	struct uart_pxa_port *up = (struct uart_pxa_port *)port;  in serial_pxa_start_tx()  local
212 	if (!(up->ier & UART_IER_THRI)) {  in serial_pxa_start_tx()
213 		up->ier |= UART_IER_THRI;  in serial_pxa_start_tx()
214 		serial_out(up, UART_IER, up->ier);  in serial_pxa_start_tx()
218 /* should hold up->port.lock */
219 static inline void check_modem_status(struct uart_pxa_port *up)  in check_modem_status()  argument
223 	status = serial_in(up, UART_MSR);  in check_modem_status()
229 		up->port.icount.rng++;  in check_modem_status()
231 		up->port.icount.dsr++;  in check_modem_status()
233 		uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);  in check_modem_status()
235 		uart_handle_cts_change(&up->port, status & UART_MSR_CTS);  in check_modem_status()
237 	wake_up_interruptible(&up->port.state->port.delta_msr_wait);  in check_modem_status()
245 	struct uart_pxa_port *up = dev_id;  in serial_pxa_irq()  local
248 	iir = serial_in(up, UART_IIR);  in serial_pxa_irq()
251 	spin_lock(&up->port.lock);  in serial_pxa_irq()
252 	lsr = serial_in(up, UART_LSR);  in serial_pxa_irq()
254 		receive_chars(up, &lsr);  in serial_pxa_irq()
255 	check_modem_status(up);  in serial_pxa_irq()
257 		transmit_chars(up);  in serial_pxa_irq()
258 	spin_unlock(&up->port.lock);  in serial_pxa_irq()
264 	struct uart_pxa_port *up = (struct uart_pxa_port *)port;  in serial_pxa_tx_empty()  local
268 	spin_lock_irqsave(&up->port.lock, flags);  in serial_pxa_tx_empty()
269 	ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;  in serial_pxa_tx_empty()
270 	spin_unlock_irqrestore(&up->port.lock, flags);  in serial_pxa_tx_empty()
277 	struct uart_pxa_port *up = (struct uart_pxa_port *)port;  in serial_pxa_get_mctrl()  local
281 	status = serial_in(up, UART_MSR);  in serial_pxa_get_mctrl()
297 	struct uart_pxa_port *up = (struct uart_pxa_port *)port;  in serial_pxa_set_mctrl()  local
311 	mcr |= up->mcr;  in serial_pxa_set_mctrl()
313 	serial_out(up, UART_MCR, mcr);  in serial_pxa_set_mctrl()
318 	struct uart_pxa_port *up = (struct uart_pxa_port *)port;  in serial_pxa_break_ctl()  local
321 	spin_lock_irqsave(&up->port.lock, flags);  in serial_pxa_break_ctl()
322 	if (break_state == -1)  in serial_pxa_break_ctl()
323 		up->lcr |= UART_LCR_SBC;  in serial_pxa_break_ctl()
325 		up->lcr &= ~UART_LCR_SBC;  in serial_pxa_break_ctl()
326 	serial_out(up, UART_LCR, up->lcr);  in serial_pxa_break_ctl()
327 	spin_unlock_irqrestore(&up->port.lock, flags);  in serial_pxa_break_ctl()
332 	struct uart_pxa_port *up = (struct uart_pxa_port *)port;  in serial_pxa_startup()  local
336 	if (port->line == 3) /* HWUART */  in serial_pxa_startup()
337 		up->mcr |= UART_MCR_AFE;  in serial_pxa_startup()
339 		up->mcr = 0;  in serial_pxa_startup()
341 	up->port.uartclk = clk_get_rate(up->clk);  in serial_pxa_startup()
346 	retval = request_irq(up->port.irq, serial_pxa_irq, 0, up->name, up);  in serial_pxa_startup()
354 	serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);  in serial_pxa_startup()
355 	serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |  in serial_pxa_startup()
357 	serial_out(up, UART_FCR, 0);  in serial_pxa_startup()
362 	(void) serial_in(up, UART_LSR);  in serial_pxa_startup()
363 	(void) serial_in(up, UART_RX);  in serial_pxa_startup()
364 	(void) serial_in(up, UART_IIR);  in serial_pxa_startup()
365 	(void) serial_in(up, UART_MSR);  in serial_pxa_startup()
370 	serial_out(up, UART_LCR, UART_LCR_WLEN8);  in serial_pxa_startup()
372 	spin_lock_irqsave(&up->port.lock, flags);  in serial_pxa_startup()
373 	up->port.mctrl |= TIOCM_OUT2;  in serial_pxa_startup()
374 	serial_pxa_set_mctrl(&up->port, up->port.mctrl);  in serial_pxa_startup()
375 	spin_unlock_irqrestore(&up->port.lock, flags);  in serial_pxa_startup()
382 	up->ier = UART_IER_RLSI | UART_IER_RDI | UART_IER_RTOIE | UART_IER_UUE;  in serial_pxa_startup()
383 	serial_out(up, UART_IER, up->ier);  in serial_pxa_startup()
388 	(void) serial_in(up, UART_LSR);  in serial_pxa_startup()
389 	(void) serial_in(up, UART_RX);  in serial_pxa_startup()
390 	(void) serial_in(up, UART_IIR);  in serial_pxa_startup()
391 	(void) serial_in(up, UART_MSR);  in serial_pxa_startup()
398 	struct uart_pxa_port *up = (struct uart_pxa_port *)port;  in serial_pxa_shutdown()  local
401 	free_irq(up->port.irq, up);  in serial_pxa_shutdown()
406 	up->ier = 0;  in serial_pxa_shutdown()
407 	serial_out(up, UART_IER, 0);  in serial_pxa_shutdown()
409 	spin_lock_irqsave(&up->port.lock, flags);  in serial_pxa_shutdown()
410 	up->port.mctrl &= ~TIOCM_OUT2;  in serial_pxa_shutdown()
411 	serial_pxa_set_mctrl(&up->port, up->port.mctrl);  in serial_pxa_shutdown()
412 	spin_unlock_irqrestore(&up->port.lock, flags);  in serial_pxa_shutdown()
417 	serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);  in serial_pxa_shutdown()
418 	serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |  in serial_pxa_shutdown()
421 	serial_out(up, UART_FCR, 0);  in serial_pxa_shutdown()
428 	struct uart_pxa_port *up = (struct uart_pxa_port *)port;  in serial_pxa_set_termios()  local
434 	cval = UART_LCR_WLEN(tty_get_char_size(termios->c_cflag));  in serial_pxa_set_termios()
436 	if (termios->c_cflag & CSTOPB)  in serial_pxa_set_termios()
438 	if (termios->c_cflag & PARENB)  in serial_pxa_set_termios()
440 	if (!(termios->c_cflag & PARODD))  in serial_pxa_set_termios()
446 	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);  in serial_pxa_set_termios()
449 	if ((up->port.uartclk / quot) < (2400 * 16))  in serial_pxa_set_termios()
451 	else if ((up->port.uartclk / quot) < (230400 * 16))  in serial_pxa_set_termios()
460 	spin_lock_irqsave(&up->port.lock, flags);  in serial_pxa_set_termios()
466 	up->ier |= UART_IER_UUE;  in serial_pxa_set_termios()
469 	 * Update the per-port timeout.  in serial_pxa_set_termios()
471 	uart_update_timeout(port, termios->c_cflag, baud);  in serial_pxa_set_termios()
473 	up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;  in serial_pxa_set_termios()
474 	if (termios->c_iflag & INPCK)  in serial_pxa_set_termios()
475 		up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;  in serial_pxa_set_termios()
476 	if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))  in serial_pxa_set_termios()
477 		up->port.read_status_mask |= UART_LSR_BI;  in serial_pxa_set_termios()
482 	up->port.ignore_status_mask = 0;  in serial_pxa_set_termios()
483 	if (termios->c_iflag & IGNPAR)  in serial_pxa_set_termios()
484 		up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;  in serial_pxa_set_termios()
485 	if (termios->c_iflag & IGNBRK) {  in serial_pxa_set_termios()
486 		up->port.ignore_status_mask |= UART_LSR_BI;  in serial_pxa_set_termios()
491 		if (termios->c_iflag & IGNPAR)  in serial_pxa_set_termios()
492 			up->port.ignore_status_mask |= UART_LSR_OE;  in serial_pxa_set_termios()
498 	if ((termios->c_cflag & CREAD) == 0)  in serial_pxa_set_termios()
499 		up->port.ignore_status_mask |= UART_LSR_DR;  in serial_pxa_set_termios()
504 	up->ier &= ~UART_IER_MSI;  in serial_pxa_set_termios()
505 	if (UART_ENABLE_MS(&up->port, termios->c_cflag))  in serial_pxa_set_termios()
506 		up->ier |= UART_IER_MSI;  in serial_pxa_set_termios()
508 	serial_out(up, UART_IER, up->ier);  in serial_pxa_set_termios()
510 	if (termios->c_cflag & CRTSCTS)  in serial_pxa_set_termios()
511 		up->mcr |= UART_MCR_AFE;  in serial_pxa_set_termios()
513 		up->mcr &= ~UART_MCR_AFE;  in serial_pxa_set_termios()
515 	serial_out(up, UART_LCR, cval | UART_LCR_DLAB);	/* set DLAB */  in serial_pxa_set_termios()
516 	serial_out(up, UART_DLL, quot & 0xff);		/* LS of divisor */  in serial_pxa_set_termios()
522 	dll = serial_in(up, UART_DLL);  in serial_pxa_set_termios()
525 	serial_out(up, UART_DLM, quot >> 8);		/* MS of divisor */  in serial_pxa_set_termios()
526 	serial_out(up, UART_LCR, cval);			/* reset DLAB */  in serial_pxa_set_termios()
527 	up->lcr = cval;					/* Save LCR */  in serial_pxa_set_termios()
528 	serial_pxa_set_mctrl(&up->port, up->port.mctrl);  in serial_pxa_set_termios()
529 	serial_out(up, UART_FCR, fcr);  in serial_pxa_set_termios()
530 	spin_unlock_irqrestore(&up->port.lock, flags);  in serial_pxa_set_termios()
537 	struct uart_pxa_port *up = (struct uart_pxa_port *)port;  in serial_pxa_pm()  local
540 		clk_prepare_enable(up->clk);  in serial_pxa_pm()
542 		clk_disable_unprepare(up->clk);  in serial_pxa_pm()
556 	struct uart_pxa_port *up = (struct uart_pxa_port *)port;  in serial_pxa_config_port()  local
557 	up->port.type = PORT_PXA;  in serial_pxa_config_port()
564 	return -EINVAL;  in serial_pxa_verify_port()
570 	struct uart_pxa_port *up = (struct uart_pxa_port *)port;  in serial_pxa_type()  local
571 	return up->name;  in serial_pxa_type()
582 static void wait_for_xmitr(struct uart_pxa_port *up)  in wait_for_xmitr()  argument
586 	/* Wait up to 10ms for the character(s) to be sent. */  in wait_for_xmitr()
588 		status = serial_in(up, UART_LSR);  in wait_for_xmitr()
591 			up->lsr_break_flag = UART_LSR_BI;  in wait_for_xmitr()
593 		if (--tmout == 0)  in wait_for_xmitr()
598 	/* Wait up to 1s for flow control if necessary */  in wait_for_xmitr()
599 	if (up->port.flags & UPF_CONS_FLOW) {  in wait_for_xmitr()
601 		while (--tmout &&  in wait_for_xmitr()
602 		       ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0))  in wait_for_xmitr()
609 	struct uart_pxa_port *up = (struct uart_pxa_port *)port;  in serial_pxa_console_putchar()  local
611 	wait_for_xmitr(up);  in serial_pxa_console_putchar()
612 	serial_out(up, UART_TX, ch);  in serial_pxa_console_putchar()
624 	struct uart_pxa_port *up = serial_pxa_ports[co->index];  in serial_pxa_console_write()  local
629 	clk_enable(up->clk);  in serial_pxa_console_write()
631 	if (up->port.sysrq)  in serial_pxa_console_write()
634 		locked = spin_trylock(&up->port.lock);  in serial_pxa_console_write()
636 		spin_lock(&up->port.lock);  in serial_pxa_console_write()
641 	ier = serial_in(up, UART_IER);  in serial_pxa_console_write()
642 	serial_out(up, UART_IER, UART_IER_UUE);  in serial_pxa_console_write()
644 	uart_console_write(&up->port, s, count, serial_pxa_console_putchar);  in serial_pxa_console_write()
650 	wait_for_xmitr(up);  in serial_pxa_console_write()
651 	serial_out(up, UART_IER, ier);  in serial_pxa_console_write()
654 		spin_unlock(&up->port.lock);  in serial_pxa_console_write()
656 	clk_disable(up->clk);  in serial_pxa_console_write()
668 	struct uart_pxa_port *up = (struct uart_pxa_port *)port;  in serial_pxa_get_poll_char()  local
669 	unsigned char lsr = serial_in(up, UART_LSR);  in serial_pxa_get_poll_char()
672 		lsr = serial_in(up, UART_LSR);  in serial_pxa_get_poll_char()
674 	return serial_in(up, UART_RX);  in serial_pxa_get_poll_char()
682 	struct uart_pxa_port *up = (struct uart_pxa_port *)port;  in serial_pxa_put_poll_char()  local
687 	ier = serial_in(up, UART_IER);  in serial_pxa_put_poll_char()
688 	serial_out(up, UART_IER, UART_IER_UUE);  in serial_pxa_put_poll_char()
690 	wait_for_xmitr(up);  in serial_pxa_put_poll_char()
694 	serial_out(up, UART_TX, c);  in serial_pxa_put_poll_char()
700 	wait_for_xmitr(up);  in serial_pxa_put_poll_char()
701 	serial_out(up, UART_IER, ier);  in serial_pxa_put_poll_char()
709 	struct uart_pxa_port *up;  in serial_pxa_console_setup()  local
715 	if (co->index == -1 || co->index >= serial_pxa_reg.nr)  in serial_pxa_console_setup()
716 		co->index = 0;  in serial_pxa_console_setup()
717 	up = serial_pxa_ports[co->index];  in serial_pxa_console_setup()
718 	if (!up)  in serial_pxa_console_setup()
719 		return -ENODEV;  in serial_pxa_console_setup()
724 	return uart_set_options(&up->port, co, baud, parity, bits, flow);  in serial_pxa_console_setup()
733 	.index		= -1,
782                 uart_suspend_port(&serial_pxa_reg, &sport->port);  in serial_pxa_suspend()
792                 uart_resume_port(&serial_pxa_reg, &sport->port);  in serial_pxa_resume()
804 	{ .compatible = "mrvl,pxa-uart", },
805 	{ .compatible = "mrvl,mmp-uart", },
812 	struct device_node *np = pdev->dev.of_node;  in serial_pxa_probe_dt()
820 		dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret);  in serial_pxa_probe_dt()
823 	sport->port.line = ret;  in serial_pxa_probe_dt()
836 		return -ENODEV;  in serial_pxa_probe()
844 		return -ENOMEM;  in serial_pxa_probe()
846 	sport->clk = clk_get(&dev->dev, NULL);  in serial_pxa_probe()
847 	if (IS_ERR(sport->clk)) {  in serial_pxa_probe()
848 		ret = PTR_ERR(sport->clk);  in serial_pxa_probe()
852 	ret = clk_prepare(sport->clk);  in serial_pxa_probe()
854 		clk_put(sport->clk);  in serial_pxa_probe()
858 	sport->port.type = PORT_PXA;  in serial_pxa_probe()
859 	sport->port.iotype = UPIO_MEM;  in serial_pxa_probe()
860 	sport->port.mapbase = mmres->start;  in serial_pxa_probe()
861 	sport->port.irq = irq;  in serial_pxa_probe()
862 	sport->port.fifosize = 64;  in serial_pxa_probe()
863 	sport->port.ops = &serial_pxa_pops;  in serial_pxa_probe()
864 	sport->port.dev = &dev->dev;  in serial_pxa_probe()
865 	sport->port.flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;  in serial_pxa_probe()
866 	sport->port.uartclk = clk_get_rate(sport->clk);  in serial_pxa_probe()
867 	sport->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_PXA_CONSOLE);  in serial_pxa_probe()
871 		sport->port.line = dev->id;  in serial_pxa_probe()
874 	if (sport->port.line >= ARRAY_SIZE(serial_pxa_ports)) {  in serial_pxa_probe()
875 		dev_err(&dev->dev, "serial%d out of range\n", sport->port.line);  in serial_pxa_probe()
876 		ret = -EINVAL;  in serial_pxa_probe()
879 	snprintf(sport->name, PXA_NAME_LEN - 1, "UART%d", sport->port.line + 1);  in serial_pxa_probe()
881 	sport->port.membase = ioremap(mmres->start, resource_size(mmres));  in serial_pxa_probe()
882 	if (!sport->port.membase) {  in serial_pxa_probe()
883 		ret = -ENOMEM;  in serial_pxa_probe()
887 	serial_pxa_ports[sport->port.line] = sport;  in serial_pxa_probe()
889 	uart_add_one_port(&serial_pxa_reg, &sport->port);  in serial_pxa_probe()
895 	clk_unprepare(sport->clk);  in serial_pxa_probe()
896 	clk_put(sport->clk);  in serial_pxa_probe()
906 	        .name	= "pxa2xx-uart",