1 // SPDX-License-Identifier: GPL-2.0+
3 * Based on drivers/serial/8250.c by Russell King.
5 * Author: Nicolas Pitre
6 * Created: Feb 20, 2003
7 * Copyright: (C) 2003 Monta Vista Software, Inc.
9 * Note 1: This driver is made separate from the already too overloaded
10 * 8250.c because it needs some kirks of its own and that'll make it
11 * easier to add DMA support.
13 * Note 2: I'm too sick of device allocation policies for serial ports.
14 * If someone else wants to request an "official" allocation of major/minor
15 * for this driver please be my guest. And don't forget that new hardware
16 * to come from Intel might have more than 3 or 4 of those UARTs. Let's
17 * hope for a better port registration and dynamic device allocation scheme
18 * with the serial core maintainer satisfaction to appear soon.
22 #include <linux/ioport.h>
23 #include <linux/init.h>
24 #include <linux/console.h>
25 #include <linux/sysrq.h>
26 #include <linux/serial_reg.h>
27 #include <linux/circ_buf.h>
28 #include <linux/delay.h>
29 #include <linux/interrupt.h>
31 #include <linux/platform_device.h>
32 #include <linux/tty.h>
33 #include <linux/tty_flip.h>
34 #include <linux/serial_core.h>
35 #include <linux/clk.h>
37 #include <linux/slab.h>
39 #define PXA_NAME_LEN 8
41 struct uart_pxa_port {
42 struct uart_port port;
46 unsigned int lsr_break_flag;
48 char name[PXA_NAME_LEN];
51 static inline unsigned int serial_in(struct uart_pxa_port *up, int offset)
54 return readl(up->port.membase + offset);
57 static inline void serial_out(struct uart_pxa_port *up, int offset, int value)
60 writel(value, up->port.membase + offset);
63 static void serial_pxa_enable_ms(struct uart_port *port)
65 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
67 up->ier |= UART_IER_MSI;
68 serial_out(up, UART_IER, up->ier);
71 static void serial_pxa_stop_tx(struct uart_port *port)
73 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
75 if (up->ier & UART_IER_THRI) {
76 up->ier &= ~UART_IER_THRI;
77 serial_out(up, UART_IER, up->ier);
81 static void serial_pxa_stop_rx(struct uart_port *port)
83 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
85 up->ier &= ~UART_IER_RLSI;
86 up->port.read_status_mask &= ~UART_LSR_DR;
87 serial_out(up, UART_IER, up->ier);
90 static inline void receive_chars(struct uart_pxa_port *up, int *status)
92 unsigned int ch, flag;
96 /* work around Errata #20 according to
97 * Intel(R) PXA27x Processor Family
98 * Specification Update (May 2005)
101 * Disable the Reciever Time Out Interrupt via IER[RTOEI]
103 up->ier &= ~UART_IER_RTOIE;
104 serial_out(up, UART_IER, up->ier);
106 ch = serial_in(up, UART_RX);
108 up->port.icount.rx++;
110 if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
111 UART_LSR_FE | UART_LSR_OE))) {
113 * For statistics only
115 if (*status & UART_LSR_BI) {
116 *status &= ~(UART_LSR_FE | UART_LSR_PE);
117 up->port.icount.brk++;
119 * We do the SysRQ and SAK checking
120 * here because otherwise the break
121 * may get masked by ignore_status_mask
122 * or read_status_mask.
124 if (uart_handle_break(&up->port))
126 } else if (*status & UART_LSR_PE)
127 up->port.icount.parity++;
128 else if (*status & UART_LSR_FE)
129 up->port.icount.frame++;
130 if (*status & UART_LSR_OE)
131 up->port.icount.overrun++;
134 * Mask off conditions which should be ignored.
136 *status &= up->port.read_status_mask;
138 #ifdef CONFIG_SERIAL_PXA_CONSOLE
139 if (up->port.line == up->port.cons->index) {
140 /* Recover the break flag from console xmit */
141 *status |= up->lsr_break_flag;
142 up->lsr_break_flag = 0;
145 if (*status & UART_LSR_BI) {
147 } else if (*status & UART_LSR_PE)
149 else if (*status & UART_LSR_FE)
153 if (uart_handle_sysrq_char(&up->port, ch))
156 uart_insert_char(&up->port, *status, UART_LSR_OE, ch, flag);
159 *status = serial_in(up, UART_LSR);
160 } while ((*status & UART_LSR_DR) && (max_count-- > 0));
161 tty_flip_buffer_push(&up->port.state->port);
163 /* work around Errata #20 according to
164 * Intel(R) PXA27x Processor Family
165 * Specification Update (May 2005)
168 * No more data in FIFO: Re-enable RTO interrupt via IER[RTOIE]
170 up->ier |= UART_IER_RTOIE;
171 serial_out(up, UART_IER, up->ier);
174 static void transmit_chars(struct uart_pxa_port *up)
176 struct circ_buf *xmit = &up->port.state->xmit;
179 if (up->port.x_char) {
180 serial_out(up, UART_TX, up->port.x_char);
181 up->port.icount.tx++;
185 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
186 serial_pxa_stop_tx(&up->port);
190 count = up->port.fifosize / 2;
192 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
193 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
194 up->port.icount.tx++;
195 if (uart_circ_empty(xmit))
197 } while (--count > 0);
199 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
200 uart_write_wakeup(&up->port);
203 if (uart_circ_empty(xmit))
204 serial_pxa_stop_tx(&up->port);
207 static void serial_pxa_start_tx(struct uart_port *port)
209 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
211 if (!(up->ier & UART_IER_THRI)) {
212 up->ier |= UART_IER_THRI;
213 serial_out(up, UART_IER, up->ier);
217 /* should hold up->port.lock */
218 static inline void check_modem_status(struct uart_pxa_port *up)
222 status = serial_in(up, UART_MSR);
224 if ((status & UART_MSR_ANY_DELTA) == 0)
227 if (status & UART_MSR_TERI)
228 up->port.icount.rng++;
229 if (status & UART_MSR_DDSR)
230 up->port.icount.dsr++;
231 if (status & UART_MSR_DDCD)
232 uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);
233 if (status & UART_MSR_DCTS)
234 uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
236 wake_up_interruptible(&up->port.state->port.delta_msr_wait);
240 * This handles the interrupt from one port.
242 static inline irqreturn_t serial_pxa_irq(int irq, void *dev_id)
244 struct uart_pxa_port *up = dev_id;
245 unsigned int iir, lsr;
247 iir = serial_in(up, UART_IIR);
248 if (iir & UART_IIR_NO_INT)
250 spin_lock(&up->port.lock);
251 lsr = serial_in(up, UART_LSR);
252 if (lsr & UART_LSR_DR)
253 receive_chars(up, &lsr);
254 check_modem_status(up);
255 if (lsr & UART_LSR_THRE)
257 spin_unlock(&up->port.lock);
261 static unsigned int serial_pxa_tx_empty(struct uart_port *port)
263 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
267 spin_lock_irqsave(&up->port.lock, flags);
268 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
269 spin_unlock_irqrestore(&up->port.lock, flags);
274 static unsigned int serial_pxa_get_mctrl(struct uart_port *port)
276 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
277 unsigned char status;
280 status = serial_in(up, UART_MSR);
283 if (status & UART_MSR_DCD)
285 if (status & UART_MSR_RI)
287 if (status & UART_MSR_DSR)
289 if (status & UART_MSR_CTS)
294 static void serial_pxa_set_mctrl(struct uart_port *port, unsigned int mctrl)
296 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
297 unsigned char mcr = 0;
299 if (mctrl & TIOCM_RTS)
301 if (mctrl & TIOCM_DTR)
303 if (mctrl & TIOCM_OUT1)
304 mcr |= UART_MCR_OUT1;
305 if (mctrl & TIOCM_OUT2)
306 mcr |= UART_MCR_OUT2;
307 if (mctrl & TIOCM_LOOP)
308 mcr |= UART_MCR_LOOP;
312 serial_out(up, UART_MCR, mcr);
315 static void serial_pxa_break_ctl(struct uart_port *port, int break_state)
317 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
320 spin_lock_irqsave(&up->port.lock, flags);
321 if (break_state == -1)
322 up->lcr |= UART_LCR_SBC;
324 up->lcr &= ~UART_LCR_SBC;
325 serial_out(up, UART_LCR, up->lcr);
326 spin_unlock_irqrestore(&up->port.lock, flags);
329 static int serial_pxa_startup(struct uart_port *port)
331 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
335 if (port->line == 3) /* HWUART */
336 up->mcr |= UART_MCR_AFE;
340 up->port.uartclk = clk_get_rate(up->clk);
345 retval = request_irq(up->port.irq, serial_pxa_irq, 0, up->name, up);
350 * Clear the FIFO buffers and disable them.
351 * (they will be reenabled in set_termios())
353 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
354 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
355 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
356 serial_out(up, UART_FCR, 0);
359 * Clear the interrupt registers.
361 (void) serial_in(up, UART_LSR);
362 (void) serial_in(up, UART_RX);
363 (void) serial_in(up, UART_IIR);
364 (void) serial_in(up, UART_MSR);
367 * Now, initialize the UART
369 serial_out(up, UART_LCR, UART_LCR_WLEN8);
371 spin_lock_irqsave(&up->port.lock, flags);
372 up->port.mctrl |= TIOCM_OUT2;
373 serial_pxa_set_mctrl(&up->port, up->port.mctrl);
374 spin_unlock_irqrestore(&up->port.lock, flags);
377 * Finally, enable interrupts. Note: Modem status interrupts
378 * are set via set_termios(), which will be occurring imminently
379 * anyway, so we don't enable them here.
381 up->ier = UART_IER_RLSI | UART_IER_RDI | UART_IER_RTOIE | UART_IER_UUE;
382 serial_out(up, UART_IER, up->ier);
385 * And clear the interrupt registers again for luck.
387 (void) serial_in(up, UART_LSR);
388 (void) serial_in(up, UART_RX);
389 (void) serial_in(up, UART_IIR);
390 (void) serial_in(up, UART_MSR);
395 static void serial_pxa_shutdown(struct uart_port *port)
397 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
400 free_irq(up->port.irq, up);
403 * Disable interrupts from this port
406 serial_out(up, UART_IER, 0);
408 spin_lock_irqsave(&up->port.lock, flags);
409 up->port.mctrl &= ~TIOCM_OUT2;
410 serial_pxa_set_mctrl(&up->port, up->port.mctrl);
411 spin_unlock_irqrestore(&up->port.lock, flags);
414 * Disable break condition and FIFOs
416 serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
417 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
418 UART_FCR_CLEAR_RCVR |
419 UART_FCR_CLEAR_XMIT);
420 serial_out(up, UART_FCR, 0);
424 serial_pxa_set_termios(struct uart_port *port, struct ktermios *termios,
425 struct ktermios *old)
427 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
428 unsigned char cval, fcr = 0;
430 unsigned int baud, quot;
433 switch (termios->c_cflag & CSIZE) {
435 cval = UART_LCR_WLEN5;
438 cval = UART_LCR_WLEN6;
441 cval = UART_LCR_WLEN7;
445 cval = UART_LCR_WLEN8;
449 if (termios->c_cflag & CSTOPB)
450 cval |= UART_LCR_STOP;
451 if (termios->c_cflag & PARENB)
452 cval |= UART_LCR_PARITY;
453 if (!(termios->c_cflag & PARODD))
454 cval |= UART_LCR_EPAR;
457 * Ask the core to calculate the divisor for us.
459 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
460 quot = uart_get_divisor(port, baud);
462 if ((up->port.uartclk / quot) < (2400 * 16))
463 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR1;
464 else if ((up->port.uartclk / quot) < (230400 * 16))
465 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR8;
467 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR32;
470 * Ok, we're now changing the port state. Do it with
471 * interrupts disabled.
473 spin_lock_irqsave(&up->port.lock, flags);
476 * Ensure the port will be enabled.
477 * This is required especially for serial console.
479 up->ier |= UART_IER_UUE;
482 * Update the per-port timeout.
484 uart_update_timeout(port, termios->c_cflag, baud);
486 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
487 if (termios->c_iflag & INPCK)
488 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
489 if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
490 up->port.read_status_mask |= UART_LSR_BI;
493 * Characters to ignore
495 up->port.ignore_status_mask = 0;
496 if (termios->c_iflag & IGNPAR)
497 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
498 if (termios->c_iflag & IGNBRK) {
499 up->port.ignore_status_mask |= UART_LSR_BI;
501 * If we're ignoring parity and break indicators,
502 * ignore overruns too (for real raw support).
504 if (termios->c_iflag & IGNPAR)
505 up->port.ignore_status_mask |= UART_LSR_OE;
509 * ignore all characters if CREAD is not set
511 if ((termios->c_cflag & CREAD) == 0)
512 up->port.ignore_status_mask |= UART_LSR_DR;
515 * CTS flow control flag and modem status interrupts
517 up->ier &= ~UART_IER_MSI;
518 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
519 up->ier |= UART_IER_MSI;
521 serial_out(up, UART_IER, up->ier);
523 if (termios->c_cflag & CRTSCTS)
524 up->mcr |= UART_MCR_AFE;
526 up->mcr &= ~UART_MCR_AFE;
528 serial_out(up, UART_LCR, cval | UART_LCR_DLAB); /* set DLAB */
529 serial_out(up, UART_DLL, quot & 0xff); /* LS of divisor */
532 * work around Errata #75 according to Intel(R) PXA27x Processor Family
533 * Specification Update (Nov 2005)
535 dll = serial_in(up, UART_DLL);
536 WARN_ON(dll != (quot & 0xff));
538 serial_out(up, UART_DLM, quot >> 8); /* MS of divisor */
539 serial_out(up, UART_LCR, cval); /* reset DLAB */
540 up->lcr = cval; /* Save LCR */
541 serial_pxa_set_mctrl(&up->port, up->port.mctrl);
542 serial_out(up, UART_FCR, fcr);
543 spin_unlock_irqrestore(&up->port.lock, flags);
547 serial_pxa_pm(struct uart_port *port, unsigned int state,
548 unsigned int oldstate)
550 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
553 clk_prepare_enable(up->clk);
555 clk_disable_unprepare(up->clk);
558 static void serial_pxa_release_port(struct uart_port *port)
562 static int serial_pxa_request_port(struct uart_port *port)
567 static void serial_pxa_config_port(struct uart_port *port, int flags)
569 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
570 up->port.type = PORT_PXA;
574 serial_pxa_verify_port(struct uart_port *port, struct serial_struct *ser)
576 /* we don't want the core code to modify any port params */
581 serial_pxa_type(struct uart_port *port)
583 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
587 static struct uart_pxa_port *serial_pxa_ports[4];
588 static struct uart_driver serial_pxa_reg;
590 #ifdef CONFIG_SERIAL_PXA_CONSOLE
592 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
595 * Wait for transmitter & holding register to empty
597 static void wait_for_xmitr(struct uart_pxa_port *up)
599 unsigned int status, tmout = 10000;
601 /* Wait up to 10ms for the character(s) to be sent. */
603 status = serial_in(up, UART_LSR);
605 if (status & UART_LSR_BI)
606 up->lsr_break_flag = UART_LSR_BI;
611 } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
613 /* Wait up to 1s for flow control if necessary */
614 if (up->port.flags & UPF_CONS_FLOW) {
617 ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0))
622 static void serial_pxa_console_putchar(struct uart_port *port, int ch)
624 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
627 serial_out(up, UART_TX, ch);
631 * Print a string to the serial port trying not to disturb
632 * any possible real use of the port...
634 * The console_lock must be held when we get here.
637 serial_pxa_console_write(struct console *co, const char *s, unsigned int count)
639 struct uart_pxa_port *up = serial_pxa_ports[co->index];
645 local_irq_save(flags);
648 else if (oops_in_progress)
649 locked = spin_trylock(&up->port.lock);
651 spin_lock(&up->port.lock);
654 * First save the IER then disable the interrupts
656 ier = serial_in(up, UART_IER);
657 serial_out(up, UART_IER, UART_IER_UUE);
659 uart_console_write(&up->port, s, count, serial_pxa_console_putchar);
662 * Finally, wait for transmitter to become empty
663 * and restore the IER
666 serial_out(up, UART_IER, ier);
669 spin_unlock(&up->port.lock);
670 local_irq_restore(flags);
671 clk_disable(up->clk);
675 #ifdef CONFIG_CONSOLE_POLL
677 * Console polling routines for writing and reading from the uart while
678 * in an interrupt or debug context.
681 static int serial_pxa_get_poll_char(struct uart_port *port)
683 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
684 unsigned char lsr = serial_in(up, UART_LSR);
686 while (!(lsr & UART_LSR_DR))
687 lsr = serial_in(up, UART_LSR);
689 return serial_in(up, UART_RX);
693 static void serial_pxa_put_poll_char(struct uart_port *port,
697 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
700 * First save the IER then disable the interrupts
702 ier = serial_in(up, UART_IER);
703 serial_out(up, UART_IER, UART_IER_UUE);
707 * Send the character out.
709 serial_out(up, UART_TX, c);
712 * Finally, wait for transmitter to become empty
713 * and restore the IER
716 serial_out(up, UART_IER, ier);
719 #endif /* CONFIG_CONSOLE_POLL */
722 serial_pxa_console_setup(struct console *co, char *options)
724 struct uart_pxa_port *up;
730 if (co->index == -1 || co->index >= serial_pxa_reg.nr)
732 up = serial_pxa_ports[co->index];
737 uart_parse_options(options, &baud, &parity, &bits, &flow);
739 return uart_set_options(&up->port, co, baud, parity, bits, flow);
742 static struct console serial_pxa_console = {
744 .write = serial_pxa_console_write,
745 .device = uart_console_device,
746 .setup = serial_pxa_console_setup,
747 .flags = CON_PRINTBUFFER,
749 .data = &serial_pxa_reg,
752 #define PXA_CONSOLE &serial_pxa_console
754 #define PXA_CONSOLE NULL
757 static const struct uart_ops serial_pxa_pops = {
758 .tx_empty = serial_pxa_tx_empty,
759 .set_mctrl = serial_pxa_set_mctrl,
760 .get_mctrl = serial_pxa_get_mctrl,
761 .stop_tx = serial_pxa_stop_tx,
762 .start_tx = serial_pxa_start_tx,
763 .stop_rx = serial_pxa_stop_rx,
764 .enable_ms = serial_pxa_enable_ms,
765 .break_ctl = serial_pxa_break_ctl,
766 .startup = serial_pxa_startup,
767 .shutdown = serial_pxa_shutdown,
768 .set_termios = serial_pxa_set_termios,
770 .type = serial_pxa_type,
771 .release_port = serial_pxa_release_port,
772 .request_port = serial_pxa_request_port,
773 .config_port = serial_pxa_config_port,
774 .verify_port = serial_pxa_verify_port,
775 #if defined(CONFIG_CONSOLE_POLL) && defined(CONFIG_SERIAL_PXA_CONSOLE)
776 .poll_get_char = serial_pxa_get_poll_char,
777 .poll_put_char = serial_pxa_put_poll_char,
781 static struct uart_driver serial_pxa_reg = {
782 .owner = THIS_MODULE,
783 .driver_name = "PXA serial",
792 static int serial_pxa_suspend(struct device *dev)
794 struct uart_pxa_port *sport = dev_get_drvdata(dev);
797 uart_suspend_port(&serial_pxa_reg, &sport->port);
802 static int serial_pxa_resume(struct device *dev)
804 struct uart_pxa_port *sport = dev_get_drvdata(dev);
807 uart_resume_port(&serial_pxa_reg, &sport->port);
812 static const struct dev_pm_ops serial_pxa_pm_ops = {
813 .suspend = serial_pxa_suspend,
814 .resume = serial_pxa_resume,
818 static const struct of_device_id serial_pxa_dt_ids[] = {
819 { .compatible = "mrvl,pxa-uart", },
820 { .compatible = "mrvl,mmp-uart", },
824 static int serial_pxa_probe_dt(struct platform_device *pdev,
825 struct uart_pxa_port *sport)
827 struct device_node *np = pdev->dev.of_node;
833 ret = of_alias_get_id(np, "serial");
835 dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret);
838 sport->port.line = ret;
842 static int serial_pxa_probe(struct platform_device *dev)
844 struct uart_pxa_port *sport;
845 struct resource *mmres, *irqres;
848 mmres = platform_get_resource(dev, IORESOURCE_MEM, 0);
849 irqres = platform_get_resource(dev, IORESOURCE_IRQ, 0);
850 if (!mmres || !irqres)
853 sport = kzalloc(sizeof(struct uart_pxa_port), GFP_KERNEL);
857 sport->clk = clk_get(&dev->dev, NULL);
858 if (IS_ERR(sport->clk)) {
859 ret = PTR_ERR(sport->clk);
863 ret = clk_prepare(sport->clk);
869 sport->port.type = PORT_PXA;
870 sport->port.iotype = UPIO_MEM;
871 sport->port.mapbase = mmres->start;
872 sport->port.irq = irqres->start;
873 sport->port.fifosize = 64;
874 sport->port.ops = &serial_pxa_pops;
875 sport->port.dev = &dev->dev;
876 sport->port.flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
877 sport->port.uartclk = clk_get_rate(sport->clk);
878 sport->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_PXA_CONSOLE);
880 ret = serial_pxa_probe_dt(dev, sport);
882 sport->port.line = dev->id;
885 if (sport->port.line >= ARRAY_SIZE(serial_pxa_ports)) {
886 dev_err(&dev->dev, "serial%d out of range\n", sport->port.line);
890 snprintf(sport->name, PXA_NAME_LEN - 1, "UART%d", sport->port.line + 1);
892 sport->port.membase = ioremap(mmres->start, resource_size(mmres));
893 if (!sport->port.membase) {
898 serial_pxa_ports[sport->port.line] = sport;
900 uart_add_one_port(&serial_pxa_reg, &sport->port);
901 platform_set_drvdata(dev, sport);
906 clk_unprepare(sport->clk);
913 static struct platform_driver serial_pxa_driver = {
914 .probe = serial_pxa_probe,
917 .name = "pxa2xx-uart",
919 .pm = &serial_pxa_pm_ops,
921 .suppress_bind_attrs = true,
922 .of_match_table = serial_pxa_dt_ids,
927 /* 8250 driver for PXA serial ports should be used */
928 static int __init serial_pxa_init(void)
932 ret = uart_register_driver(&serial_pxa_reg);
936 ret = platform_driver_register(&serial_pxa_driver);
938 uart_unregister_driver(&serial_pxa_reg);
942 device_initcall(serial_pxa_init);