2 * linux/drivers/char/at91_serial.c
4 * Driver for Atmel AT91 / AT32 Serial ports
5 * Copyright (C) 2003 Rick Bronson
7 * Based on drivers/char/serial_sa1100.c, by Deep Blue Solutions Ltd.
8 * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 #include <linux/module.h>
26 #include <linux/tty.h>
27 #include <linux/ioport.h>
28 #include <linux/slab.h>
29 #include <linux/init.h>
30 #include <linux/serial.h>
31 #include <linux/clk.h>
32 #include <linux/console.h>
33 #include <linux/sysrq.h>
34 #include <linux/tty_flip.h>
35 #include <linux/platform_device.h>
39 #include <asm/arch/at91rm9200_pdc.h>
40 #include <asm/mach/serial_at91.h>
41 #include <asm/arch/board.h>
42 #include <asm/arch/system.h>
43 #include <asm/arch/gpio.h>
45 #include "atmel_serial.h"
47 #if defined(CONFIG_SERIAL_ATMEL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
51 #include <linux/serial_core.h>
53 #ifdef CONFIG_SERIAL_ATMEL_TTYAT
55 /* Use device name ttyAT, major 204 and minor 154-169. This is necessary if we
56 * should coexist with the 8250 driver, such as if we have an external 16C550
58 #define SERIAL_ATMEL_MAJOR 204
59 #define MINOR_START 154
60 #define ATMEL_DEVICENAME "ttyAT"
64 /* Use device name ttyS, major 4, minor 64-68. This is the usual serial port
65 * name, but it is legally reserved for the 8250 driver. */
66 #define SERIAL_ATMEL_MAJOR TTY_MAJOR
67 #define MINOR_START 64
68 #define ATMEL_DEVICENAME "ttyS"
72 #define ATMEL_ISR_PASS_LIMIT 256
74 #define UART_PUT_CR(port,v) writel(v, (port)->membase + ATMEL_US_CR)
75 #define UART_GET_MR(port) readl((port)->membase + ATMEL_US_MR)
76 #define UART_PUT_MR(port,v) writel(v, (port)->membase + ATMEL_US_MR)
77 #define UART_PUT_IER(port,v) writel(v, (port)->membase + ATMEL_US_IER)
78 #define UART_PUT_IDR(port,v) writel(v, (port)->membase + ATMEL_US_IDR)
79 #define UART_GET_IMR(port) readl((port)->membase + ATMEL_US_IMR)
80 #define UART_GET_CSR(port) readl((port)->membase + ATMEL_US_CSR)
81 #define UART_GET_CHAR(port) readl((port)->membase + ATMEL_US_RHR)
82 #define UART_PUT_CHAR(port,v) writel(v, (port)->membase + ATMEL_US_THR)
83 #define UART_GET_BRGR(port) readl((port)->membase + ATMEL_US_BRGR)
84 #define UART_PUT_BRGR(port,v) writel(v, (port)->membase + ATMEL_US_BRGR)
85 #define UART_PUT_RTOR(port,v) writel(v, (port)->membase + ATMEL_US_RTOR)
87 // #define UART_GET_CR(port) readl((port)->membase + ATMEL_US_CR) // is write-only
90 #define UART_PUT_PTCR(port,v) writel(v, (port)->membase + ATMEL_PDC_PTCR)
91 #define UART_GET_PTSR(port) readl((port)->membase + ATMEL_PDC_PTSR)
93 #define UART_PUT_RPR(port,v) writel(v, (port)->membase + ATMEL_PDC_RPR)
94 #define UART_GET_RPR(port) readl((port)->membase + ATMEL_PDC_RPR)
95 #define UART_PUT_RCR(port,v) writel(v, (port)->membase + ATMEL_PDC_RCR)
96 #define UART_PUT_RNPR(port,v) writel(v, (port)->membase + ATMEL_PDC_RNPR)
97 #define UART_PUT_RNCR(port,v) writel(v, (port)->membase + ATMEL_PDC_RNCR)
99 #define UART_PUT_TPR(port,v) writel(v, (port)->membase + ATMEL_PDC_TPR)
100 #define UART_PUT_TCR(port,v) writel(v, (port)->membase + ATMEL_PDC_TCR)
101 //#define UART_PUT_TNPR(port,v) writel(v, (port)->membase + ATMEL_PDC_TNPR)
102 //#define UART_PUT_TNCR(port,v) writel(v, (port)->membase + ATMEL_PDC_TNCR)
104 static int (*atmel_open_hook)(struct uart_port *);
105 static void (*atmel_close_hook)(struct uart_port *);
108 * We wrap our port structure around the generic uart_port.
110 struct atmel_uart_port {
111 struct uart_port uart; /* uart */
112 struct clk *clk; /* uart clock */
113 unsigned short suspended; /* is port suspended? */
116 static struct atmel_uart_port atmel_ports[ATMEL_MAX_UART];
119 static struct console atmel_console;
123 * Return TIOCSER_TEMT when transmitter FIFO and Shift register is empty.
125 static u_int atmel_tx_empty(struct uart_port *port)
127 return (UART_GET_CSR(port) & ATMEL_US_TXEMPTY) ? TIOCSER_TEMT : 0;
131 * Set state of the modem control output lines
133 static void atmel_set_mctrl(struct uart_port *port, u_int mctrl)
135 unsigned int control = 0;
138 if (arch_identify() == ARCH_ID_AT91RM9200) {
140 * AT91RM9200 Errata #39: RTS0 is not internally connected to PA21.
141 * We need to drive the pin manually.
143 if (port->mapbase == AT91RM9200_BASE_US0) {
144 if (mctrl & TIOCM_RTS)
145 at91_set_gpio_value(AT91_PIN_PA21, 0);
147 at91_set_gpio_value(AT91_PIN_PA21, 1);
151 if (mctrl & TIOCM_RTS)
152 control |= ATMEL_US_RTSEN;
154 control |= ATMEL_US_RTSDIS;
156 if (mctrl & TIOCM_DTR)
157 control |= ATMEL_US_DTREN;
159 control |= ATMEL_US_DTRDIS;
161 UART_PUT_CR(port, control);
163 /* Local loopback mode? */
164 mode = UART_GET_MR(port) & ~ATMEL_US_CHMODE;
165 if (mctrl & TIOCM_LOOP)
166 mode |= ATMEL_US_CHMODE_LOC_LOOP;
168 mode |= ATMEL_US_CHMODE_NORMAL;
169 UART_PUT_MR(port, mode);
173 * Get state of the modem control input lines
175 static u_int atmel_get_mctrl(struct uart_port *port)
177 unsigned int status, ret = 0;
179 status = UART_GET_CSR(port);
182 * The control signals are active low.
184 if (!(status & ATMEL_US_DCD))
186 if (!(status & ATMEL_US_CTS))
188 if (!(status & ATMEL_US_DSR))
190 if (!(status & ATMEL_US_RI))
199 static void atmel_stop_tx(struct uart_port *port)
201 struct atmel_uart_port *atmel_port = (struct atmel_uart_port *) port;
203 UART_PUT_IDR(port, ATMEL_US_TXRDY);
207 * Start transmitting.
209 static void atmel_start_tx(struct uart_port *port)
211 struct atmel_uart_port *atmel_port = (struct atmel_uart_port *) port;
213 UART_PUT_IER(port, ATMEL_US_TXRDY);
217 * Stop receiving - port is in process of being closed.
219 static void atmel_stop_rx(struct uart_port *port)
221 struct atmel_uart_port *atmel_port = (struct atmel_uart_port *) port;
223 UART_PUT_IDR(port, ATMEL_US_RXRDY);
227 * Enable modem status interrupts
229 static void atmel_enable_ms(struct uart_port *port)
231 UART_PUT_IER(port, ATMEL_US_RIIC | ATMEL_US_DSRIC | ATMEL_US_DCDIC | ATMEL_US_CTSIC);
235 * Control the transmission of a break signal
237 static void atmel_break_ctl(struct uart_port *port, int break_state)
239 if (break_state != 0)
240 UART_PUT_CR(port, ATMEL_US_STTBRK); /* start break */
242 UART_PUT_CR(port, ATMEL_US_STPBRK); /* stop break */
246 * Characters received (called from interrupt handler)
248 static void atmel_rx_chars(struct uart_port *port, struct pt_regs *regs)
250 struct tty_struct *tty = port->info->tty;
251 unsigned int status, ch, flg;
253 status = UART_GET_CSR(port);
254 while (status & ATMEL_US_RXRDY) {
255 ch = UART_GET_CHAR(port);
262 * note that the error handling code is
263 * out of the main execution path
265 if (unlikely(status & (ATMEL_US_PARE | ATMEL_US_FRAME | ATMEL_US_OVRE | ATMEL_US_RXBRK))) {
266 UART_PUT_CR(port, ATMEL_US_RSTSTA); /* clear error */
267 if (status & ATMEL_US_RXBRK) {
268 status &= ~(ATMEL_US_PARE | ATMEL_US_FRAME); /* ignore side-effect */
270 if (uart_handle_break(port))
273 if (status & ATMEL_US_PARE)
274 port->icount.parity++;
275 if (status & ATMEL_US_FRAME)
276 port->icount.frame++;
277 if (status & ATMEL_US_OVRE)
278 port->icount.overrun++;
280 status &= port->read_status_mask;
282 if (status & ATMEL_US_RXBRK)
284 else if (status & ATMEL_US_PARE)
286 else if (status & ATMEL_US_FRAME)
290 if (uart_handle_sysrq_char(port, ch, regs))
293 uart_insert_char(port, status, ATMEL_US_OVRE, ch, flg);
296 status = UART_GET_CSR(port);
299 tty_flip_buffer_push(tty);
303 * Transmit characters (called from interrupt handler)
305 static void atmel_tx_chars(struct uart_port *port)
307 struct circ_buf *xmit = &port->info->xmit;
310 UART_PUT_CHAR(port, port->x_char);
315 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
320 while (UART_GET_CSR(port) & ATMEL_US_TXRDY) {
321 UART_PUT_CHAR(port, xmit->buf[xmit->tail]);
322 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
324 if (uart_circ_empty(xmit))
328 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
329 uart_write_wakeup(port);
331 if (uart_circ_empty(xmit))
338 static irqreturn_t atmel_interrupt(int irq, void *dev_id, struct pt_regs *regs)
340 struct uart_port *port = dev_id;
341 struct atmel_uart_port *atmel_port = (struct atmel_uart_port *) port;
342 unsigned int status, pending, pass_counter = 0;
344 status = UART_GET_CSR(port);
345 pending = status & UART_GET_IMR(port);
347 /* Interrupt receive */
348 if (pending & ATMEL_US_RXRDY)
349 atmel_rx_chars(port, regs);
351 // TODO: All reads to CSR will clear these interrupts!
352 if (pending & ATMEL_US_RIIC) port->icount.rng++;
353 if (pending & ATMEL_US_DSRIC) port->icount.dsr++;
354 if (pending & ATMEL_US_DCDIC)
355 uart_handle_dcd_change(port, !(status & ATMEL_US_DCD));
356 if (pending & ATMEL_US_CTSIC)
357 uart_handle_cts_change(port, !(status & ATMEL_US_CTS));
358 if (pending & (ATMEL_US_RIIC | ATMEL_US_DSRIC | ATMEL_US_DCDIC | ATMEL_US_CTSIC))
359 wake_up_interruptible(&port->info->delta_msr_wait);
361 /* Interrupt transmit */
362 if (pending & ATMEL_US_TXRDY)
363 atmel_tx_chars(port);
365 if (pass_counter++ > ATMEL_ISR_PASS_LIMIT)
368 status = UART_GET_CSR(port);
369 pending = status & UART_GET_IMR(port);
375 * Perform initialization and enable port for reception
377 static int atmel_startup(struct uart_port *port)
379 struct atmel_uart_port *atmel_port = (struct atmel_uart_port *) port;
383 * Ensure that no interrupts are enabled otherwise when
384 * request_irq() is called we could get stuck trying to
385 * handle an unexpected interrupt
387 UART_PUT_IDR(port, -1);
392 retval = request_irq(port->irq, atmel_interrupt, IRQF_SHARED, "atmel_serial", port);
394 printk("atmel_serial: atmel_startup - Can't get irq\n");
399 * If there is a specific "open" function (to register
400 * control line interrupts)
402 if (atmel_open_hook) {
403 retval = atmel_open_hook(port);
405 free_irq(port->irq, port);
411 * Finally, enable the serial port
413 UART_PUT_CR(port, ATMEL_US_RSTSTA | ATMEL_US_RSTRX);
414 UART_PUT_CR(port, ATMEL_US_TXEN | ATMEL_US_RXEN); /* enable xmit & rcvr */
416 UART_PUT_IER(port, ATMEL_US_RXRDY); /* enable receive only */
424 static void atmel_shutdown(struct uart_port *port)
426 struct atmel_uart_port *atmel_port = (struct atmel_uart_port *) port;
429 * Disable all interrupts, port and break condition.
431 UART_PUT_CR(port, ATMEL_US_RSTSTA);
432 UART_PUT_IDR(port, -1);
437 free_irq(port->irq, port);
440 * If there is a specific "close" function (to unregister
441 * control line interrupts)
443 if (atmel_close_hook)
444 atmel_close_hook(port);
448 * Power / Clock management.
450 static void atmel_serial_pm(struct uart_port *port, unsigned int state, unsigned int oldstate)
452 struct atmel_uart_port *atmel_port = (struct atmel_uart_port *) port;
457 * Enable the peripheral clock for this serial port.
458 * This is called on uart_open() or a resume event.
460 clk_enable(atmel_port->clk);
464 * Disable the peripheral clock for this serial port.
465 * This is called on uart_close() or a suspend event.
467 clk_disable(atmel_port->clk);
470 printk(KERN_ERR "atmel_serial: unknown pm %d\n", state);
475 * Change the port parameters
477 static void atmel_set_termios(struct uart_port *port, struct termios * termios, struct termios * old)
480 unsigned int mode, imr, quot, baud;
482 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
483 quot = uart_get_divisor(port, baud);
485 /* Get current mode register */
486 mode = UART_GET_MR(port) & ~(ATMEL_US_CHRL | ATMEL_US_NBSTOP | ATMEL_US_PAR);
489 switch (termios->c_cflag & CSIZE) {
491 mode |= ATMEL_US_CHRL_5;
494 mode |= ATMEL_US_CHRL_6;
497 mode |= ATMEL_US_CHRL_7;
500 mode |= ATMEL_US_CHRL_8;
505 if (termios->c_cflag & CSTOPB)
506 mode |= ATMEL_US_NBSTOP_2;
509 if (termios->c_cflag & PARENB) {
510 if (termios->c_cflag & CMSPAR) { /* Mark or Space parity */
511 if (termios->c_cflag & PARODD)
512 mode |= ATMEL_US_PAR_MARK;
514 mode |= ATMEL_US_PAR_SPACE;
516 else if (termios->c_cflag & PARODD)
517 mode |= ATMEL_US_PAR_ODD;
519 mode |= ATMEL_US_PAR_EVEN;
522 mode |= ATMEL_US_PAR_NONE;
524 spin_lock_irqsave(&port->lock, flags);
526 port->read_status_mask = ATMEL_US_OVRE;
527 if (termios->c_iflag & INPCK)
528 port->read_status_mask |= (ATMEL_US_FRAME | ATMEL_US_PARE);
529 if (termios->c_iflag & (BRKINT | PARMRK))
530 port->read_status_mask |= ATMEL_US_RXBRK;
533 * Characters to ignore
535 port->ignore_status_mask = 0;
536 if (termios->c_iflag & IGNPAR)
537 port->ignore_status_mask |= (ATMEL_US_FRAME | ATMEL_US_PARE);
538 if (termios->c_iflag & IGNBRK) {
539 port->ignore_status_mask |= ATMEL_US_RXBRK;
541 * If we're ignoring parity and break indicators,
542 * ignore overruns too (for real raw support).
544 if (termios->c_iflag & IGNPAR)
545 port->ignore_status_mask |= ATMEL_US_OVRE;
548 // TODO: Ignore all characters if CREAD is set.
550 /* update the per-port timeout */
551 uart_update_timeout(port, termios->c_cflag, baud);
553 /* disable interrupts and drain transmitter */
554 imr = UART_GET_IMR(port); /* get interrupt mask */
555 UART_PUT_IDR(port, -1); /* disable all interrupts */
556 while (!(UART_GET_CSR(port) & ATMEL_US_TXEMPTY)) { barrier(); }
558 /* disable receiver and transmitter */
559 UART_PUT_CR(port, ATMEL_US_TXDIS | ATMEL_US_RXDIS);
561 /* set the parity, stop bits and data size */
562 UART_PUT_MR(port, mode);
564 /* set the baud rate */
565 UART_PUT_BRGR(port, quot);
566 UART_PUT_CR(port, ATMEL_US_RSTSTA | ATMEL_US_RSTRX);
567 UART_PUT_CR(port, ATMEL_US_TXEN | ATMEL_US_RXEN);
569 /* restore interrupts */
570 UART_PUT_IER(port, imr);
572 /* CTS flow-control and modem-status interrupts */
573 if (UART_ENABLE_MS(port, termios->c_cflag))
574 port->ops->enable_ms(port);
576 spin_unlock_irqrestore(&port->lock, flags);
580 * Return string describing the specified port
582 static const char *atmel_type(struct uart_port *port)
584 return (port->type == PORT_ATMEL) ? "ATMEL_SERIAL" : NULL;
588 * Release the memory region(s) being used by 'port'.
590 static void atmel_release_port(struct uart_port *port)
592 struct platform_device *pdev = to_platform_device(port->dev);
593 int size = pdev->resource[0].end - pdev->resource[0].start + 1;
595 release_mem_region(port->mapbase, size);
597 if (port->flags & UPF_IOREMAP) {
598 iounmap(port->membase);
599 port->membase = NULL;
604 * Request the memory region(s) being used by 'port'.
606 static int atmel_request_port(struct uart_port *port)
608 struct platform_device *pdev = to_platform_device(port->dev);
609 int size = pdev->resource[0].end - pdev->resource[0].start + 1;
611 if (!request_mem_region(port->mapbase, size, "atmel_serial"))
614 if (port->flags & UPF_IOREMAP) {
615 port->membase = ioremap(port->mapbase, size);
616 if (port->membase == NULL) {
617 release_mem_region(port->mapbase, size);
626 * Configure/autoconfigure the port.
628 static void atmel_config_port(struct uart_port *port, int flags)
630 if (flags & UART_CONFIG_TYPE) {
631 port->type = PORT_ATMEL;
632 atmel_request_port(port);
637 * Verify the new serial_struct (for TIOCSSERIAL).
639 static int atmel_verify_port(struct uart_port *port, struct serial_struct *ser)
642 if (ser->type != PORT_UNKNOWN && ser->type != PORT_ATMEL)
644 if (port->irq != ser->irq)
646 if (ser->io_type != SERIAL_IO_MEM)
648 if (port->uartclk / 16 != ser->baud_base)
650 if ((void *)port->mapbase != ser->iomem_base)
652 if (port->iobase != ser->port)
659 static struct uart_ops atmel_pops = {
660 .tx_empty = atmel_tx_empty,
661 .set_mctrl = atmel_set_mctrl,
662 .get_mctrl = atmel_get_mctrl,
663 .stop_tx = atmel_stop_tx,
664 .start_tx = atmel_start_tx,
665 .stop_rx = atmel_stop_rx,
666 .enable_ms = atmel_enable_ms,
667 .break_ctl = atmel_break_ctl,
668 .startup = atmel_startup,
669 .shutdown = atmel_shutdown,
670 .set_termios = atmel_set_termios,
672 .release_port = atmel_release_port,
673 .request_port = atmel_request_port,
674 .config_port = atmel_config_port,
675 .verify_port = atmel_verify_port,
676 .pm = atmel_serial_pm,
680 * Configure the port from the platform device resource info.
682 static void __devinit atmel_init_port(struct atmel_uart_port *atmel_port, struct platform_device *pdev)
684 struct uart_port *port = &atmel_port->uart;
685 struct atmel_uart_data *data = pdev->dev.platform_data;
687 port->iotype = UPIO_MEM;
688 port->flags = UPF_BOOT_AUTOCONF;
689 port->ops = &atmel_pops;
691 port->line = pdev->id;
692 port->dev = &pdev->dev;
694 port->mapbase = pdev->resource[0].start;
695 port->irq = pdev->resource[1].start;
698 /* Already mapped by setup code */
699 port->membase = data->regs;
701 port->flags |= UPF_IOREMAP;
702 port->membase = NULL;
705 if (!atmel_port->clk) { /* for console, the clock could already be configured */
706 atmel_port->clk = clk_get(&pdev->dev, "usart");
707 clk_enable(atmel_port->clk);
708 port->uartclk = clk_get_rate(atmel_port->clk);
713 * Register board-specific modem-control line handlers.
715 void __init atmel_register_uart_fns(struct atmel_port_fns *fns)
718 atmel_pops.enable_ms = fns->enable_ms;
720 atmel_pops.get_mctrl = fns->get_mctrl;
722 atmel_pops.set_mctrl = fns->set_mctrl;
723 atmel_open_hook = fns->open;
724 atmel_close_hook = fns->close;
725 atmel_pops.pm = fns->pm;
726 atmel_pops.set_wake = fns->set_wake;
730 #ifdef CONFIG_SERIAL_ATMEL_CONSOLE
731 static void atmel_console_putchar(struct uart_port *port, int ch)
733 while (!(UART_GET_CSR(port) & ATMEL_US_TXRDY))
735 UART_PUT_CHAR(port, ch);
739 * Interrupts are disabled on entering
741 static void atmel_console_write(struct console *co, const char *s, u_int count)
743 struct uart_port *port = &atmel_ports[co->index].uart;
744 unsigned int status, imr;
747 * First, save IMR and then disable interrupts
749 imr = UART_GET_IMR(port); /* get interrupt mask */
750 UART_PUT_IDR(port, ATMEL_US_RXRDY | ATMEL_US_TXRDY);
752 uart_console_write(port, s, count, atmel_console_putchar);
755 * Finally, wait for transmitter to become empty
759 status = UART_GET_CSR(port);
760 } while (!(status & ATMEL_US_TXRDY));
761 UART_PUT_IER(port, imr); /* set interrupts back the way they were */
765 * If the port was already initialised (eg, by a boot loader), try to determine
768 static void __init atmel_console_get_options(struct uart_port *port, int *baud, int *parity, int *bits)
770 unsigned int mr, quot;
772 // TODO: CR is a write-only register
775 // cr = UART_GET_CR(port) & (ATMEL_US_RXEN | ATMEL_US_TXEN);
776 // if (cr == (ATMEL_US_RXEN | ATMEL_US_TXEN)) {
777 // /* ok, the port was enabled */
780 mr = UART_GET_MR(port) & ATMEL_US_CHRL;
781 if (mr == ATMEL_US_CHRL_8)
786 mr = UART_GET_MR(port) & ATMEL_US_PAR;
787 if (mr == ATMEL_US_PAR_EVEN)
789 else if (mr == ATMEL_US_PAR_ODD)
792 quot = UART_GET_BRGR(port);
793 *baud = port->uartclk / (16 * (quot));
796 static int __init atmel_console_setup(struct console *co, char *options)
798 struct uart_port *port = &atmel_ports[co->index].uart;
804 if (port->membase == 0) /* Port not initialized yet - delay setup */
807 UART_PUT_IDR(port, -1); /* disable interrupts */
808 UART_PUT_CR(port, ATMEL_US_RSTSTA | ATMEL_US_RSTRX);
809 UART_PUT_CR(port, ATMEL_US_TXEN | ATMEL_US_RXEN);
812 uart_parse_options(options, &baud, &parity, &bits, &flow);
814 atmel_console_get_options(port, &baud, &parity, &bits);
816 return uart_set_options(port, co, baud, parity, bits, flow);
819 static struct uart_driver atmel_uart;
821 static struct console atmel_console = {
822 .name = ATMEL_DEVICENAME,
823 .write = atmel_console_write,
824 .device = uart_console_device,
825 .setup = atmel_console_setup,
826 .flags = CON_PRINTBUFFER,
831 #define ATMEL_CONSOLE_DEVICE &atmel_console
834 * Early console initialization (before VM subsystem initialized).
836 static int __init atmel_console_init(void)
838 if (atmel_default_console_device) {
839 add_preferred_console(ATMEL_DEVICENAME, atmel_default_console_device->id, NULL);
840 atmel_init_port(&(atmel_ports[atmel_default_console_device->id]), atmel_default_console_device);
841 register_console(&atmel_console);
846 console_initcall(atmel_console_init);
849 * Late console initialization.
851 static int __init atmel_late_console_init(void)
853 if (atmel_default_console_device && !(atmel_console.flags & CON_ENABLED))
854 register_console(&atmel_console);
858 core_initcall(atmel_late_console_init);
861 #define ATMEL_CONSOLE_DEVICE NULL
864 static struct uart_driver atmel_uart = {
865 .owner = THIS_MODULE,
866 .driver_name = "atmel_serial",
867 .dev_name = ATMEL_DEVICENAME,
868 .major = SERIAL_ATMEL_MAJOR,
869 .minor = MINOR_START,
870 .nr = ATMEL_MAX_UART,
871 .cons = ATMEL_CONSOLE_DEVICE,
875 static int atmel_serial_suspend(struct platform_device *pdev, pm_message_t state)
877 struct uart_port *port = platform_get_drvdata(pdev);
878 struct atmel_uart_port *atmel_port = (struct atmel_uart_port *) port;
880 if (device_may_wakeup(&pdev->dev) && !at91_suspend_entering_slow_clock())
881 enable_irq_wake(port->irq);
883 disable_irq_wake(port->irq);
884 uart_suspend_port(&atmel_uart, port);
885 atmel_port->suspended = 1;
891 static int atmel_serial_resume(struct platform_device *pdev)
893 struct uart_port *port = platform_get_drvdata(pdev);
894 struct atmel_uart_port *atmel_port = (struct atmel_uart_port *) port;
896 if (atmel_port->suspended) {
897 uart_resume_port(&atmel_uart, port);
898 atmel_port->suspended = 0;
904 #define atmel_serial_suspend NULL
905 #define atmel_serial_resume NULL
908 static int __devinit atmel_serial_probe(struct platform_device *pdev)
910 struct atmel_uart_port *port;
913 port = &atmel_ports[pdev->id];
914 atmel_init_port(port, pdev);
916 ret = uart_add_one_port(&atmel_uart, &port->uart);
918 device_init_wakeup(&pdev->dev, 1);
919 platform_set_drvdata(pdev, port);
925 static int __devexit atmel_serial_remove(struct platform_device *pdev)
927 struct uart_port *port = platform_get_drvdata(pdev);
928 struct atmel_uart_port *atmel_port = (struct atmel_uart_port *) port;
931 clk_disable(atmel_port->clk);
932 clk_put(atmel_port->clk);
934 device_init_wakeup(&pdev->dev, 0);
935 platform_set_drvdata(pdev, NULL);
938 ret = uart_remove_one_port(&atmel_uart, port);
945 static struct platform_driver atmel_serial_driver = {
946 .probe = atmel_serial_probe,
947 .remove = __devexit_p(atmel_serial_remove),
948 .suspend = atmel_serial_suspend,
949 .resume = atmel_serial_resume,
951 .name = "atmel_usart",
952 .owner = THIS_MODULE,
956 static int __init atmel_serial_init(void)
960 ret = uart_register_driver(&atmel_uart);
964 ret = platform_driver_register(&atmel_serial_driver);
966 uart_unregister_driver(&atmel_uart);
971 static void __exit atmel_serial_exit(void)
973 platform_driver_unregister(&atmel_serial_driver);
974 uart_unregister_driver(&atmel_uart);
977 module_init(atmel_serial_init);
978 module_exit(atmel_serial_exit);
980 MODULE_AUTHOR("Rick Bronson");
981 MODULE_DESCRIPTION("Atmel AT91 / AT32 serial port driver");
982 MODULE_LICENSE("GPL");