2 * Based on drivers/serial/8250.c by Russell King.
4 * Author: Nicolas Pitre
5 * Created: Feb 20, 2003
6 * Copyright: (C) 2003 Monta Vista Software, Inc.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * Note 1: This driver is made separate from the already too overloaded
14 * 8250.c because it needs some kirks of its own and that'll make it
15 * easier to add DMA support.
17 * Note 2: I'm too sick of device allocation policies for serial ports.
18 * If someone else wants to request an "official" allocation of major/minor
19 * for this driver please be my guest. And don't forget that new hardware
20 * to come from Intel might have more than 3 or 4 of those UARTs. Let's
21 * hope for a better port registration and dynamic device allocation scheme
22 * with the serial core maintainer satisfaction to appear soon.
26 #if defined(CONFIG_SERIAL_PXA_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
30 #include <linux/module.h>
31 #include <linux/ioport.h>
32 #include <linux/init.h>
33 #include <linux/console.h>
34 #include <linux/sysrq.h>
35 #include <linux/serial_reg.h>
36 #include <linux/circ_buf.h>
37 #include <linux/delay.h>
38 #include <linux/interrupt.h>
40 #include <linux/platform_device.h>
41 #include <linux/tty.h>
42 #include <linux/tty_flip.h>
43 #include <linux/serial_core.h>
44 #include <linux/clk.h>
46 #include <linux/slab.h>
48 #define PXA_NAME_LEN 8
50 struct uart_pxa_port {
51 struct uart_port port;
55 unsigned int lsr_break_flag;
57 char name[PXA_NAME_LEN];
60 static inline unsigned int serial_in(struct uart_pxa_port *up, int offset)
63 return readl(up->port.membase + offset);
66 static inline void serial_out(struct uart_pxa_port *up, int offset, int value)
69 writel(value, up->port.membase + offset);
72 static void serial_pxa_enable_ms(struct uart_port *port)
74 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
76 up->ier |= UART_IER_MSI;
77 serial_out(up, UART_IER, up->ier);
80 static void serial_pxa_stop_tx(struct uart_port *port)
82 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
84 if (up->ier & UART_IER_THRI) {
85 up->ier &= ~UART_IER_THRI;
86 serial_out(up, UART_IER, up->ier);
90 static void serial_pxa_stop_rx(struct uart_port *port)
92 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
94 up->ier &= ~UART_IER_RLSI;
95 up->port.read_status_mask &= ~UART_LSR_DR;
96 serial_out(up, UART_IER, up->ier);
99 static inline void receive_chars(struct uart_pxa_port *up, int *status)
101 unsigned int ch, flag;
105 /* work around Errata #20 according to
106 * Intel(R) PXA27x Processor Family
107 * Specification Update (May 2005)
110 * Disable the Reciever Time Out Interrupt via IER[RTOEI]
112 up->ier &= ~UART_IER_RTOIE;
113 serial_out(up, UART_IER, up->ier);
115 ch = serial_in(up, UART_RX);
117 up->port.icount.rx++;
119 if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
120 UART_LSR_FE | UART_LSR_OE))) {
122 * For statistics only
124 if (*status & UART_LSR_BI) {
125 *status &= ~(UART_LSR_FE | UART_LSR_PE);
126 up->port.icount.brk++;
128 * We do the SysRQ and SAK checking
129 * here because otherwise the break
130 * may get masked by ignore_status_mask
131 * or read_status_mask.
133 if (uart_handle_break(&up->port))
135 } else if (*status & UART_LSR_PE)
136 up->port.icount.parity++;
137 else if (*status & UART_LSR_FE)
138 up->port.icount.frame++;
139 if (*status & UART_LSR_OE)
140 up->port.icount.overrun++;
143 * Mask off conditions which should be ignored.
145 *status &= up->port.read_status_mask;
147 #ifdef CONFIG_SERIAL_PXA_CONSOLE
148 if (up->port.line == up->port.cons->index) {
149 /* Recover the break flag from console xmit */
150 *status |= up->lsr_break_flag;
151 up->lsr_break_flag = 0;
154 if (*status & UART_LSR_BI) {
156 } else if (*status & UART_LSR_PE)
158 else if (*status & UART_LSR_FE)
162 if (uart_handle_sysrq_char(&up->port, ch))
165 uart_insert_char(&up->port, *status, UART_LSR_OE, ch, flag);
168 *status = serial_in(up, UART_LSR);
169 } while ((*status & UART_LSR_DR) && (max_count-- > 0));
170 tty_flip_buffer_push(&up->port.state->port);
172 /* work around Errata #20 according to
173 * Intel(R) PXA27x Processor Family
174 * Specification Update (May 2005)
177 * No more data in FIFO: Re-enable RTO interrupt via IER[RTOIE]
179 up->ier |= UART_IER_RTOIE;
180 serial_out(up, UART_IER, up->ier);
183 static void transmit_chars(struct uart_pxa_port *up)
185 struct circ_buf *xmit = &up->port.state->xmit;
188 if (up->port.x_char) {
189 serial_out(up, UART_TX, up->port.x_char);
190 up->port.icount.tx++;
194 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
195 serial_pxa_stop_tx(&up->port);
199 count = up->port.fifosize / 2;
201 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
202 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
203 up->port.icount.tx++;
204 if (uart_circ_empty(xmit))
206 } while (--count > 0);
208 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
209 uart_write_wakeup(&up->port);
212 if (uart_circ_empty(xmit))
213 serial_pxa_stop_tx(&up->port);
216 static void serial_pxa_start_tx(struct uart_port *port)
218 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
220 if (!(up->ier & UART_IER_THRI)) {
221 up->ier |= UART_IER_THRI;
222 serial_out(up, UART_IER, up->ier);
226 /* should hold up->port.lock */
227 static inline void check_modem_status(struct uart_pxa_port *up)
231 status = serial_in(up, UART_MSR);
233 if ((status & UART_MSR_ANY_DELTA) == 0)
236 if (status & UART_MSR_TERI)
237 up->port.icount.rng++;
238 if (status & UART_MSR_DDSR)
239 up->port.icount.dsr++;
240 if (status & UART_MSR_DDCD)
241 uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);
242 if (status & UART_MSR_DCTS)
243 uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
245 wake_up_interruptible(&up->port.state->port.delta_msr_wait);
249 * This handles the interrupt from one port.
251 static inline irqreturn_t serial_pxa_irq(int irq, void *dev_id)
253 struct uart_pxa_port *up = dev_id;
254 unsigned int iir, lsr;
256 iir = serial_in(up, UART_IIR);
257 if (iir & UART_IIR_NO_INT)
259 spin_lock(&up->port.lock);
260 lsr = serial_in(up, UART_LSR);
261 if (lsr & UART_LSR_DR)
262 receive_chars(up, &lsr);
263 check_modem_status(up);
264 if (lsr & UART_LSR_THRE)
266 spin_unlock(&up->port.lock);
270 static unsigned int serial_pxa_tx_empty(struct uart_port *port)
272 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
276 spin_lock_irqsave(&up->port.lock, flags);
277 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
278 spin_unlock_irqrestore(&up->port.lock, flags);
283 static unsigned int serial_pxa_get_mctrl(struct uart_port *port)
285 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
286 unsigned char status;
289 status = serial_in(up, UART_MSR);
292 if (status & UART_MSR_DCD)
294 if (status & UART_MSR_RI)
296 if (status & UART_MSR_DSR)
298 if (status & UART_MSR_CTS)
303 static void serial_pxa_set_mctrl(struct uart_port *port, unsigned int mctrl)
305 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
306 unsigned char mcr = 0;
308 if (mctrl & TIOCM_RTS)
310 if (mctrl & TIOCM_DTR)
312 if (mctrl & TIOCM_OUT1)
313 mcr |= UART_MCR_OUT1;
314 if (mctrl & TIOCM_OUT2)
315 mcr |= UART_MCR_OUT2;
316 if (mctrl & TIOCM_LOOP)
317 mcr |= UART_MCR_LOOP;
321 serial_out(up, UART_MCR, mcr);
324 static void serial_pxa_break_ctl(struct uart_port *port, int break_state)
326 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
329 spin_lock_irqsave(&up->port.lock, flags);
330 if (break_state == -1)
331 up->lcr |= UART_LCR_SBC;
333 up->lcr &= ~UART_LCR_SBC;
334 serial_out(up, UART_LCR, up->lcr);
335 spin_unlock_irqrestore(&up->port.lock, flags);
338 static int serial_pxa_startup(struct uart_port *port)
340 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
344 if (port->line == 3) /* HWUART */
345 up->mcr |= UART_MCR_AFE;
349 up->port.uartclk = clk_get_rate(up->clk);
354 retval = request_irq(up->port.irq, serial_pxa_irq, 0, up->name, up);
359 * Clear the FIFO buffers and disable them.
360 * (they will be reenabled in set_termios())
362 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
363 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
364 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
365 serial_out(up, UART_FCR, 0);
368 * Clear the interrupt registers.
370 (void) serial_in(up, UART_LSR);
371 (void) serial_in(up, UART_RX);
372 (void) serial_in(up, UART_IIR);
373 (void) serial_in(up, UART_MSR);
376 * Now, initialize the UART
378 serial_out(up, UART_LCR, UART_LCR_WLEN8);
380 spin_lock_irqsave(&up->port.lock, flags);
381 up->port.mctrl |= TIOCM_OUT2;
382 serial_pxa_set_mctrl(&up->port, up->port.mctrl);
383 spin_unlock_irqrestore(&up->port.lock, flags);
386 * Finally, enable interrupts. Note: Modem status interrupts
387 * are set via set_termios(), which will be occurring imminently
388 * anyway, so we don't enable them here.
390 up->ier = UART_IER_RLSI | UART_IER_RDI | UART_IER_RTOIE | UART_IER_UUE;
391 serial_out(up, UART_IER, up->ier);
394 * And clear the interrupt registers again for luck.
396 (void) serial_in(up, UART_LSR);
397 (void) serial_in(up, UART_RX);
398 (void) serial_in(up, UART_IIR);
399 (void) serial_in(up, UART_MSR);
404 static void serial_pxa_shutdown(struct uart_port *port)
406 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
409 free_irq(up->port.irq, up);
412 * Disable interrupts from this port
415 serial_out(up, UART_IER, 0);
417 spin_lock_irqsave(&up->port.lock, flags);
418 up->port.mctrl &= ~TIOCM_OUT2;
419 serial_pxa_set_mctrl(&up->port, up->port.mctrl);
420 spin_unlock_irqrestore(&up->port.lock, flags);
423 * Disable break condition and FIFOs
425 serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
426 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
427 UART_FCR_CLEAR_RCVR |
428 UART_FCR_CLEAR_XMIT);
429 serial_out(up, UART_FCR, 0);
433 serial_pxa_set_termios(struct uart_port *port, struct ktermios *termios,
434 struct ktermios *old)
436 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
437 unsigned char cval, fcr = 0;
439 unsigned int baud, quot;
442 switch (termios->c_cflag & CSIZE) {
444 cval = UART_LCR_WLEN5;
447 cval = UART_LCR_WLEN6;
450 cval = UART_LCR_WLEN7;
454 cval = UART_LCR_WLEN8;
458 if (termios->c_cflag & CSTOPB)
459 cval |= UART_LCR_STOP;
460 if (termios->c_cflag & PARENB)
461 cval |= UART_LCR_PARITY;
462 if (!(termios->c_cflag & PARODD))
463 cval |= UART_LCR_EPAR;
466 * Ask the core to calculate the divisor for us.
468 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
469 quot = uart_get_divisor(port, baud);
471 if ((up->port.uartclk / quot) < (2400 * 16))
472 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR1;
473 else if ((up->port.uartclk / quot) < (230400 * 16))
474 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR8;
476 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR32;
479 * Ok, we're now changing the port state. Do it with
480 * interrupts disabled.
482 spin_lock_irqsave(&up->port.lock, flags);
485 * Ensure the port will be enabled.
486 * This is required especially for serial console.
488 up->ier |= UART_IER_UUE;
491 * Update the per-port timeout.
493 uart_update_timeout(port, termios->c_cflag, baud);
495 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
496 if (termios->c_iflag & INPCK)
497 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
498 if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
499 up->port.read_status_mask |= UART_LSR_BI;
502 * Characters to ignore
504 up->port.ignore_status_mask = 0;
505 if (termios->c_iflag & IGNPAR)
506 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
507 if (termios->c_iflag & IGNBRK) {
508 up->port.ignore_status_mask |= UART_LSR_BI;
510 * If we're ignoring parity and break indicators,
511 * ignore overruns too (for real raw support).
513 if (termios->c_iflag & IGNPAR)
514 up->port.ignore_status_mask |= UART_LSR_OE;
518 * ignore all characters if CREAD is not set
520 if ((termios->c_cflag & CREAD) == 0)
521 up->port.ignore_status_mask |= UART_LSR_DR;
524 * CTS flow control flag and modem status interrupts
526 up->ier &= ~UART_IER_MSI;
527 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
528 up->ier |= UART_IER_MSI;
530 serial_out(up, UART_IER, up->ier);
532 if (termios->c_cflag & CRTSCTS)
533 up->mcr |= UART_MCR_AFE;
535 up->mcr &= ~UART_MCR_AFE;
537 serial_out(up, UART_LCR, cval | UART_LCR_DLAB); /* set DLAB */
538 serial_out(up, UART_DLL, quot & 0xff); /* LS of divisor */
541 * work around Errata #75 according to Intel(R) PXA27x Processor Family
542 * Specification Update (Nov 2005)
544 dll = serial_in(up, UART_DLL);
545 WARN_ON(dll != (quot & 0xff));
547 serial_out(up, UART_DLM, quot >> 8); /* MS of divisor */
548 serial_out(up, UART_LCR, cval); /* reset DLAB */
549 up->lcr = cval; /* Save LCR */
550 serial_pxa_set_mctrl(&up->port, up->port.mctrl);
551 serial_out(up, UART_FCR, fcr);
552 spin_unlock_irqrestore(&up->port.lock, flags);
556 serial_pxa_pm(struct uart_port *port, unsigned int state,
557 unsigned int oldstate)
559 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
562 clk_prepare_enable(up->clk);
564 clk_disable_unprepare(up->clk);
567 static void serial_pxa_release_port(struct uart_port *port)
571 static int serial_pxa_request_port(struct uart_port *port)
576 static void serial_pxa_config_port(struct uart_port *port, int flags)
578 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
579 up->port.type = PORT_PXA;
583 serial_pxa_verify_port(struct uart_port *port, struct serial_struct *ser)
585 /* we don't want the core code to modify any port params */
590 serial_pxa_type(struct uart_port *port)
592 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
596 static struct uart_pxa_port *serial_pxa_ports[4];
597 static struct uart_driver serial_pxa_reg;
599 #ifdef CONFIG_SERIAL_PXA_CONSOLE
601 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
604 * Wait for transmitter & holding register to empty
606 static inline void wait_for_xmitr(struct uart_pxa_port *up)
608 unsigned int status, tmout = 10000;
610 /* Wait up to 10ms for the character(s) to be sent. */
612 status = serial_in(up, UART_LSR);
614 if (status & UART_LSR_BI)
615 up->lsr_break_flag = UART_LSR_BI;
620 } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
622 /* Wait up to 1s for flow control if necessary */
623 if (up->port.flags & UPF_CONS_FLOW) {
626 ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0))
631 static void serial_pxa_console_putchar(struct uart_port *port, int ch)
633 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
636 serial_out(up, UART_TX, ch);
640 * Print a string to the serial port trying not to disturb
641 * any possible real use of the port...
643 * The console_lock must be held when we get here.
646 serial_pxa_console_write(struct console *co, const char *s, unsigned int count)
648 struct uart_pxa_port *up = serial_pxa_ports[co->index];
654 local_irq_save(flags);
657 else if (oops_in_progress)
658 locked = spin_trylock(&up->port.lock);
660 spin_lock(&up->port.lock);
663 * First save the IER then disable the interrupts
665 ier = serial_in(up, UART_IER);
666 serial_out(up, UART_IER, UART_IER_UUE);
668 uart_console_write(&up->port, s, count, serial_pxa_console_putchar);
671 * Finally, wait for transmitter to become empty
672 * and restore the IER
675 serial_out(up, UART_IER, ier);
678 spin_unlock(&up->port.lock);
679 local_irq_restore(flags);
680 clk_disable(up->clk);
684 #ifdef CONFIG_CONSOLE_POLL
686 * Console polling routines for writing and reading from the uart while
687 * in an interrupt or debug context.
690 static int serial_pxa_get_poll_char(struct uart_port *port)
692 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
693 unsigned char lsr = serial_in(up, UART_LSR);
695 while (!(lsr & UART_LSR_DR))
696 lsr = serial_in(up, UART_LSR);
698 return serial_in(up, UART_RX);
702 static void serial_pxa_put_poll_char(struct uart_port *port,
706 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
709 * First save the IER then disable the interrupts
711 ier = serial_in(up, UART_IER);
712 serial_out(up, UART_IER, UART_IER_UUE);
716 * Send the character out.
718 serial_out(up, UART_TX, c);
721 * Finally, wait for transmitter to become empty
722 * and restore the IER
725 serial_out(up, UART_IER, ier);
728 #endif /* CONFIG_CONSOLE_POLL */
731 serial_pxa_console_setup(struct console *co, char *options)
733 struct uart_pxa_port *up;
739 if (co->index == -1 || co->index >= serial_pxa_reg.nr)
741 up = serial_pxa_ports[co->index];
746 uart_parse_options(options, &baud, &parity, &bits, &flow);
748 return uart_set_options(&up->port, co, baud, parity, bits, flow);
751 static struct console serial_pxa_console = {
753 .write = serial_pxa_console_write,
754 .device = uart_console_device,
755 .setup = serial_pxa_console_setup,
756 .flags = CON_PRINTBUFFER,
758 .data = &serial_pxa_reg,
761 #define PXA_CONSOLE &serial_pxa_console
763 #define PXA_CONSOLE NULL
766 static struct uart_ops serial_pxa_pops = {
767 .tx_empty = serial_pxa_tx_empty,
768 .set_mctrl = serial_pxa_set_mctrl,
769 .get_mctrl = serial_pxa_get_mctrl,
770 .stop_tx = serial_pxa_stop_tx,
771 .start_tx = serial_pxa_start_tx,
772 .stop_rx = serial_pxa_stop_rx,
773 .enable_ms = serial_pxa_enable_ms,
774 .break_ctl = serial_pxa_break_ctl,
775 .startup = serial_pxa_startup,
776 .shutdown = serial_pxa_shutdown,
777 .set_termios = serial_pxa_set_termios,
779 .type = serial_pxa_type,
780 .release_port = serial_pxa_release_port,
781 .request_port = serial_pxa_request_port,
782 .config_port = serial_pxa_config_port,
783 .verify_port = serial_pxa_verify_port,
784 #if defined(CONFIG_CONSOLE_POLL) && defined(CONFIG_SERIAL_PXA_CONSOLE)
785 .poll_get_char = serial_pxa_get_poll_char,
786 .poll_put_char = serial_pxa_put_poll_char,
790 static struct uart_driver serial_pxa_reg = {
791 .owner = THIS_MODULE,
792 .driver_name = "PXA serial",
801 static int serial_pxa_suspend(struct device *dev)
803 struct uart_pxa_port *sport = dev_get_drvdata(dev);
806 uart_suspend_port(&serial_pxa_reg, &sport->port);
811 static int serial_pxa_resume(struct device *dev)
813 struct uart_pxa_port *sport = dev_get_drvdata(dev);
816 uart_resume_port(&serial_pxa_reg, &sport->port);
821 static const struct dev_pm_ops serial_pxa_pm_ops = {
822 .suspend = serial_pxa_suspend,
823 .resume = serial_pxa_resume,
827 static struct of_device_id serial_pxa_dt_ids[] = {
828 { .compatible = "mrvl,pxa-uart", },
829 { .compatible = "mrvl,mmp-uart", },
832 MODULE_DEVICE_TABLE(of, serial_pxa_dt_ids);
834 static int serial_pxa_probe_dt(struct platform_device *pdev,
835 struct uart_pxa_port *sport)
837 struct device_node *np = pdev->dev.of_node;
843 ret = of_alias_get_id(np, "serial");
845 dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret);
848 sport->port.line = ret;
852 static int serial_pxa_probe(struct platform_device *dev)
854 struct uart_pxa_port *sport;
855 struct resource *mmres, *irqres;
858 mmres = platform_get_resource(dev, IORESOURCE_MEM, 0);
859 irqres = platform_get_resource(dev, IORESOURCE_IRQ, 0);
860 if (!mmres || !irqres)
863 sport = kzalloc(sizeof(struct uart_pxa_port), GFP_KERNEL);
867 sport->clk = clk_get(&dev->dev, NULL);
868 if (IS_ERR(sport->clk)) {
869 ret = PTR_ERR(sport->clk);
873 ret = clk_prepare(sport->clk);
879 sport->port.type = PORT_PXA;
880 sport->port.iotype = UPIO_MEM;
881 sport->port.mapbase = mmres->start;
882 sport->port.irq = irqres->start;
883 sport->port.fifosize = 64;
884 sport->port.ops = &serial_pxa_pops;
885 sport->port.dev = &dev->dev;
886 sport->port.flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
887 sport->port.uartclk = clk_get_rate(sport->clk);
889 ret = serial_pxa_probe_dt(dev, sport);
891 sport->port.line = dev->id;
894 snprintf(sport->name, PXA_NAME_LEN - 1, "UART%d", sport->port.line + 1);
896 sport->port.membase = ioremap(mmres->start, resource_size(mmres));
897 if (!sport->port.membase) {
902 serial_pxa_ports[sport->port.line] = sport;
904 uart_add_one_port(&serial_pxa_reg, &sport->port);
905 platform_set_drvdata(dev, sport);
910 clk_unprepare(sport->clk);
917 static int serial_pxa_remove(struct platform_device *dev)
919 struct uart_pxa_port *sport = platform_get_drvdata(dev);
921 uart_remove_one_port(&serial_pxa_reg, &sport->port);
923 clk_unprepare(sport->clk);
930 static struct platform_driver serial_pxa_driver = {
931 .probe = serial_pxa_probe,
932 .remove = serial_pxa_remove,
935 .name = "pxa2xx-uart",
937 .pm = &serial_pxa_pm_ops,
939 .of_match_table = serial_pxa_dt_ids,
943 static int __init serial_pxa_init(void)
947 ret = uart_register_driver(&serial_pxa_reg);
951 ret = platform_driver_register(&serial_pxa_driver);
953 uart_unregister_driver(&serial_pxa_reg);
958 static void __exit serial_pxa_exit(void)
960 platform_driver_unregister(&serial_pxa_driver);
961 uart_unregister_driver(&serial_pxa_reg);
964 module_init(serial_pxa_init);
965 module_exit(serial_pxa_exit);
967 MODULE_LICENSE("GPL");
968 MODULE_ALIAS("platform:pxa2xx-uart");