2 * linux/drivers/char/at91_serial.c
4 * Driver for Atmel AT91RM9200 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_AT91_MAJOR 204
59 #define MINOR_START 154
60 #define AT91_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_AT91_MAJOR TTY_MAJOR
67 #define MINOR_START 64
68 #define AT91_DEVICENAME "ttyS"
72 #define AT91_ISR_PASS_LIMIT 256
74 #define UART_PUT_CR(port,v) writel(v, (port)->membase + AT91_US_CR)
75 #define UART_GET_MR(port) readl((port)->membase + AT91_US_MR)
76 #define UART_PUT_MR(port,v) writel(v, (port)->membase + AT91_US_MR)
77 #define UART_PUT_IER(port,v) writel(v, (port)->membase + AT91_US_IER)
78 #define UART_PUT_IDR(port,v) writel(v, (port)->membase + AT91_US_IDR)
79 #define UART_GET_IMR(port) readl((port)->membase + AT91_US_IMR)
80 #define UART_GET_CSR(port) readl((port)->membase + AT91_US_CSR)
81 #define UART_GET_CHAR(port) readl((port)->membase + AT91_US_RHR)
82 #define UART_PUT_CHAR(port,v) writel(v, (port)->membase + AT91_US_THR)
83 #define UART_GET_BRGR(port) readl((port)->membase + AT91_US_BRGR)
84 #define UART_PUT_BRGR(port,v) writel(v, (port)->membase + AT91_US_BRGR)
85 #define UART_PUT_RTOR(port,v) writel(v, (port)->membase + AT91_US_RTOR)
87 // #define UART_GET_CR(port) readl((port)->membase + AT91_US_CR) // is write-only
90 #define UART_PUT_PTCR(port,v) writel(v, (port)->membase + AT91_PDC_PTCR)
91 #define UART_GET_PTSR(port) readl((port)->membase + AT91_PDC_PTSR)
93 #define UART_PUT_RPR(port,v) writel(v, (port)->membase + AT91_PDC_RPR)
94 #define UART_GET_RPR(port) readl((port)->membase + AT91_PDC_RPR)
95 #define UART_PUT_RCR(port,v) writel(v, (port)->membase + AT91_PDC_RCR)
96 #define UART_PUT_RNPR(port,v) writel(v, (port)->membase + AT91_PDC_RNPR)
97 #define UART_PUT_RNCR(port,v) writel(v, (port)->membase + AT91_PDC_RNCR)
99 #define UART_PUT_TPR(port,v) writel(v, (port)->membase + AT91_PDC_TPR)
100 #define UART_PUT_TCR(port,v) writel(v, (port)->membase + AT91_PDC_TCR)
101 //#define UART_PUT_TNPR(port,v) writel(v, (port)->membase + AT91_PDC_TNPR)
102 //#define UART_PUT_TNCR(port,v) writel(v, (port)->membase + AT91_PDC_TNCR)
104 static int (*at91_open
)(struct uart_port
*);
105 static void (*at91_close
)(struct uart_port
*);
108 * We wrap our port structure around the generic uart_port.
110 struct at91_uart_port
{
111 struct uart_port uart
; /* uart */
112 struct clk
*clk
; /* uart clock */
113 unsigned short suspended
; /* is port suspended? */
116 static struct at91_uart_port at91_ports
[AT91_NR_UART
];
119 static struct console at91_console
;
123 * Return TIOCSER_TEMT when transmitter FIFO and Shift register is empty.
125 static u_int
at91_tx_empty(struct uart_port
*port
)
127 return (UART_GET_CSR(port
) & AT91_US_TXEMPTY
) ? TIOCSER_TEMT
: 0;
131 * Set state of the modem control output lines
133 static void at91_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
|= AT91_US_RTSEN
;
154 control
|= AT91_US_RTSDIS
;
156 if (mctrl
& TIOCM_DTR
)
157 control
|= AT91_US_DTREN
;
159 control
|= AT91_US_DTRDIS
;
161 UART_PUT_CR(port
, control
);
163 /* Local loopback mode? */
164 mode
= UART_GET_MR(port
) & ~AT91_US_CHMODE
;
165 if (mctrl
& TIOCM_LOOP
)
166 mode
|= AT91_US_CHMODE_LOC_LOOP
;
168 mode
|= AT91_US_CHMODE_NORMAL
;
169 UART_PUT_MR(port
, mode
);
173 * Get state of the modem control input lines
175 static u_int
at91_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
& AT91_US_DCD
))
186 if (!(status
& AT91_US_CTS
))
188 if (!(status
& AT91_US_DSR
))
190 if (!(status
& AT91_US_RI
))
199 static void at91_stop_tx(struct uart_port
*port
)
201 struct at91_uart_port
*at91_port
= (struct at91_uart_port
*) port
;
203 UART_PUT_IDR(port
, AT91_US_TXRDY
);
207 * Start transmitting.
209 static void at91_start_tx(struct uart_port
*port
)
211 struct at91_uart_port
*at91_port
= (struct at91_uart_port
*) port
;
213 UART_PUT_IER(port
, AT91_US_TXRDY
);
217 * Stop receiving - port is in process of being closed.
219 static void at91_stop_rx(struct uart_port
*port
)
221 struct at91_uart_port
*at91_port
= (struct at91_uart_port
*) port
;
223 UART_PUT_IDR(port
, AT91_US_RXRDY
);
227 * Enable modem status interrupts
229 static void at91_enable_ms(struct uart_port
*port
)
231 UART_PUT_IER(port
, AT91_US_RIIC
| AT91_US_DSRIC
| AT91_US_DCDIC
| AT91_US_CTSIC
);
235 * Control the transmission of a break signal
237 static void at91_break_ctl(struct uart_port
*port
, int break_state
)
239 if (break_state
!= 0)
240 UART_PUT_CR(port
, AT91_US_STTBRK
); /* start break */
242 UART_PUT_CR(port
, AT91_US_STPBRK
); /* stop break */
246 * Characters received (called from interrupt handler)
248 static void at91_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
& AT91_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
& (AT91_US_PARE
| AT91_US_FRAME
| AT91_US_OVRE
| AT91_US_RXBRK
))) {
266 UART_PUT_CR(port
, AT91_US_RSTSTA
); /* clear error */
267 if (status
& AT91_US_RXBRK
) {
268 status
&= ~(AT91_US_PARE
| AT91_US_FRAME
); /* ignore side-effect */
270 if (uart_handle_break(port
))
273 if (status
& AT91_US_PARE
)
274 port
->icount
.parity
++;
275 if (status
& AT91_US_FRAME
)
276 port
->icount
.frame
++;
277 if (status
& AT91_US_OVRE
)
278 port
->icount
.overrun
++;
280 status
&= port
->read_status_mask
;
282 if (status
& AT91_US_RXBRK
)
284 else if (status
& AT91_US_PARE
)
286 else if (status
& AT91_US_FRAME
)
290 if (uart_handle_sysrq_char(port
, ch
, regs
))
293 uart_insert_char(port
, status
, AT91_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 at91_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
) & AT91_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
at91_interrupt(int irq
, void *dev_id
, struct pt_regs
*regs
)
340 struct uart_port
*port
= dev_id
;
341 struct at91_uart_port
*at91_port
= (struct at91_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
& AT91_US_RXRDY
)
349 at91_rx_chars(port
, regs
);
351 // TODO: All reads to CSR will clear these interrupts!
352 if (pending
& AT91_US_RIIC
) port
->icount
.rng
++;
353 if (pending
& AT91_US_DSRIC
) port
->icount
.dsr
++;
354 if (pending
& AT91_US_DCDIC
)
355 uart_handle_dcd_change(port
, !(status
& AT91_US_DCD
));
356 if (pending
& AT91_US_CTSIC
)
357 uart_handle_cts_change(port
, !(status
& AT91_US_CTS
));
358 if (pending
& (AT91_US_RIIC
| AT91_US_DSRIC
| AT91_US_DCDIC
| AT91_US_CTSIC
))
359 wake_up_interruptible(&port
->info
->delta_msr_wait
);
361 /* Interrupt transmit */
362 if (pending
& AT91_US_TXRDY
)
365 if (pass_counter
++ > AT91_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 at91_startup(struct uart_port
*port
)
379 struct at91_uart_port
*at91_port
= (struct at91_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
, at91_interrupt
, IRQF_SHARED
, "at91_serial", port
);
394 printk("at91_serial: at91_startup - Can't get irq\n");
399 * If there is a specific "open" function (to register
400 * control line interrupts)
403 retval
= at91_open(port
);
405 free_irq(port
->irq
, port
);
411 * Finally, enable the serial port
413 UART_PUT_CR(port
, AT91_US_RSTSTA
| AT91_US_RSTRX
);
414 UART_PUT_CR(port
, AT91_US_TXEN
| AT91_US_RXEN
); /* enable xmit & rcvr */
416 UART_PUT_IER(port
, AT91_US_RXRDY
); /* enable receive only */
424 static void at91_shutdown(struct uart_port
*port
)
426 struct at91_uart_port
*at91_port
= (struct at91_uart_port
*) port
;
429 * Disable all interrupts, port and break condition.
431 UART_PUT_CR(port
, AT91_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)
448 * Power / Clock management.
450 static void at91_serial_pm(struct uart_port
*port
, unsigned int state
, unsigned int oldstate
)
452 struct at91_uart_port
*at91_port
= (struct at91_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(at91_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(at91_port
->clk
);
470 printk(KERN_ERR
"at91_serial: unknown pm %d\n", state
);
475 * Change the port parameters
477 static void at91_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
) & ~(AT91_US_CHRL
| AT91_US_NBSTOP
| AT91_US_PAR
);
489 switch (termios
->c_cflag
& CSIZE
) {
491 mode
|= AT91_US_CHRL_5
;
494 mode
|= AT91_US_CHRL_6
;
497 mode
|= AT91_US_CHRL_7
;
500 mode
|= AT91_US_CHRL_8
;
505 if (termios
->c_cflag
& CSTOPB
)
506 mode
|= AT91_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
|= AT91_US_PAR_MARK
;
514 mode
|= AT91_US_PAR_SPACE
;
516 else if (termios
->c_cflag
& PARODD
)
517 mode
|= AT91_US_PAR_ODD
;
519 mode
|= AT91_US_PAR_EVEN
;
522 mode
|= AT91_US_PAR_NONE
;
524 spin_lock_irqsave(&port
->lock
, flags
);
526 port
->read_status_mask
= AT91_US_OVRE
;
527 if (termios
->c_iflag
& INPCK
)
528 port
->read_status_mask
|= (AT91_US_FRAME
| AT91_US_PARE
);
529 if (termios
->c_iflag
& (BRKINT
| PARMRK
))
530 port
->read_status_mask
|= AT91_US_RXBRK
;
533 * Characters to ignore
535 port
->ignore_status_mask
= 0;
536 if (termios
->c_iflag
& IGNPAR
)
537 port
->ignore_status_mask
|= (AT91_US_FRAME
| AT91_US_PARE
);
538 if (termios
->c_iflag
& IGNBRK
) {
539 port
->ignore_status_mask
|= AT91_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
|= AT91_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
) & AT91_US_TXEMPTY
)) { barrier(); }
558 /* disable receiver and transmitter */
559 UART_PUT_CR(port
, AT91_US_TXDIS
| AT91_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
, AT91_US_RSTSTA
| AT91_US_RSTRX
);
567 UART_PUT_CR(port
, AT91_US_TXEN
| AT91_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 *at91_type(struct uart_port
*port
)
584 return (port
->type
== PORT_AT91
) ? "AT91_SERIAL" : NULL
;
588 * Release the memory region(s) being used by 'port'.
590 static void at91_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 at91_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
, "at91_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 at91_config_port(struct uart_port
*port
, int flags
)
630 if (flags
& UART_CONFIG_TYPE
) {
631 port
->type
= PORT_AT91
;
632 at91_request_port(port
);
637 * Verify the new serial_struct (for TIOCSSERIAL).
639 static int at91_verify_port(struct uart_port
*port
, struct serial_struct
*ser
)
642 if (ser
->type
!= PORT_UNKNOWN
&& ser
->type
!= PORT_AT91
)
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 at91_pops
= {
660 .tx_empty
= at91_tx_empty
,
661 .set_mctrl
= at91_set_mctrl
,
662 .get_mctrl
= at91_get_mctrl
,
663 .stop_tx
= at91_stop_tx
,
664 .start_tx
= at91_start_tx
,
665 .stop_rx
= at91_stop_rx
,
666 .enable_ms
= at91_enable_ms
,
667 .break_ctl
= at91_break_ctl
,
668 .startup
= at91_startup
,
669 .shutdown
= at91_shutdown
,
670 .set_termios
= at91_set_termios
,
672 .release_port
= at91_release_port
,
673 .request_port
= at91_request_port
,
674 .config_port
= at91_config_port
,
675 .verify_port
= at91_verify_port
,
676 .pm
= at91_serial_pm
,
680 * Configure the port from the platform device resource info.
682 static void __devinit
at91_init_port(struct at91_uart_port
*at91_port
, struct platform_device
*pdev
)
684 struct uart_port
*port
= &at91_port
->uart
;
685 struct at91_uart_data
*data
= pdev
->dev
.platform_data
;
687 port
->iotype
= UPIO_MEM
;
688 port
->flags
= UPF_BOOT_AUTOCONF
;
689 port
->ops
= &at91_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
;
697 if (port
->mapbase
== AT91_VA_BASE_SYS
+ AT91_DBGU
) /* Part of system perpherals - already mapped */
698 port
->membase
= (void __iomem
*) port
->mapbase
;
700 port
->flags
|= UPF_IOREMAP
;
701 port
->membase
= NULL
;
704 if (!at91_port
->clk
) { /* for console, the clock could already be configured */
705 at91_port
->clk
= clk_get(&pdev
->dev
, "usart");
706 clk_enable(at91_port
->clk
);
707 port
->uartclk
= clk_get_rate(at91_port
->clk
);
712 * Register board-specific modem-control line handlers.
714 void __init
at91_register_uart_fns(struct at91_port_fns
*fns
)
717 at91_pops
.enable_ms
= fns
->enable_ms
;
719 at91_pops
.get_mctrl
= fns
->get_mctrl
;
721 at91_pops
.set_mctrl
= fns
->set_mctrl
;
722 at91_open
= fns
->open
;
723 at91_close
= fns
->close
;
724 at91_pops
.pm
= fns
->pm
;
725 at91_pops
.set_wake
= fns
->set_wake
;
729 #ifdef CONFIG_SERIAL_ATMEL_CONSOLE
730 static void at91_console_putchar(struct uart_port
*port
, int ch
)
732 while (!(UART_GET_CSR(port
) & AT91_US_TXRDY
))
734 UART_PUT_CHAR(port
, ch
);
738 * Interrupts are disabled on entering
740 static void at91_console_write(struct console
*co
, const char *s
, u_int count
)
742 struct uart_port
*port
= &at91_ports
[co
->index
].uart
;
743 unsigned int status
, imr
;
746 * First, save IMR and then disable interrupts
748 imr
= UART_GET_IMR(port
); /* get interrupt mask */
749 UART_PUT_IDR(port
, AT91_US_RXRDY
| AT91_US_TXRDY
);
751 uart_console_write(port
, s
, count
, at91_console_putchar
);
754 * Finally, wait for transmitter to become empty
758 status
= UART_GET_CSR(port
);
759 } while (!(status
& AT91_US_TXRDY
));
760 UART_PUT_IER(port
, imr
); /* set interrupts back the way they were */
764 * If the port was already initialised (eg, by a boot loader), try to determine
767 static void __init
at91_console_get_options(struct uart_port
*port
, int *baud
, int *parity
, int *bits
)
769 unsigned int mr
, quot
;
771 // TODO: CR is a write-only register
774 // cr = UART_GET_CR(port) & (AT91_US_RXEN | AT91_US_TXEN);
775 // if (cr == (AT91_US_RXEN | AT91_US_TXEN)) {
776 // /* ok, the port was enabled */
779 mr
= UART_GET_MR(port
) & AT91_US_CHRL
;
780 if (mr
== AT91_US_CHRL_8
)
785 mr
= UART_GET_MR(port
) & AT91_US_PAR
;
786 if (mr
== AT91_US_PAR_EVEN
)
788 else if (mr
== AT91_US_PAR_ODD
)
791 quot
= UART_GET_BRGR(port
);
792 *baud
= port
->uartclk
/ (16 * (quot
));
795 static int __init
at91_console_setup(struct console
*co
, char *options
)
797 struct uart_port
*port
= &at91_ports
[co
->index
].uart
;
803 if (port
->membase
== 0) /* Port not initialized yet - delay setup */
806 UART_PUT_IDR(port
, -1); /* disable interrupts */
807 UART_PUT_CR(port
, AT91_US_RSTSTA
| AT91_US_RSTRX
);
808 UART_PUT_CR(port
, AT91_US_TXEN
| AT91_US_RXEN
);
811 uart_parse_options(options
, &baud
, &parity
, &bits
, &flow
);
813 at91_console_get_options(port
, &baud
, &parity
, &bits
);
815 return uart_set_options(port
, co
, baud
, parity
, bits
, flow
);
818 static struct uart_driver at91_uart
;
820 static struct console at91_console
= {
821 .name
= AT91_DEVICENAME
,
822 .write
= at91_console_write
,
823 .device
= uart_console_device
,
824 .setup
= at91_console_setup
,
825 .flags
= CON_PRINTBUFFER
,
830 #define AT91_CONSOLE_DEVICE &at91_console
833 * Early console initialization (before VM subsystem initialized).
835 static int __init
at91_console_init(void)
837 if (at91_default_console_device
) {
838 add_preferred_console(AT91_DEVICENAME
, at91_default_console_device
->id
, NULL
);
839 at91_init_port(&(at91_ports
[at91_default_console_device
->id
]), at91_default_console_device
);
840 register_console(&at91_console
);
845 console_initcall(at91_console_init
);
848 * Late console initialization.
850 static int __init
at91_late_console_init(void)
852 if (at91_default_console_device
&& !(at91_console
.flags
& CON_ENABLED
))
853 register_console(&at91_console
);
857 core_initcall(at91_late_console_init
);
860 #define AT91_CONSOLE_DEVICE NULL
863 static struct uart_driver at91_uart
= {
864 .owner
= THIS_MODULE
,
865 .driver_name
= "at91_serial",
866 .dev_name
= AT91_DEVICENAME
,
867 .major
= SERIAL_AT91_MAJOR
,
868 .minor
= MINOR_START
,
870 .cons
= AT91_CONSOLE_DEVICE
,
874 static int at91_serial_suspend(struct platform_device
*pdev
, pm_message_t state
)
876 struct uart_port
*port
= platform_get_drvdata(pdev
);
877 struct at91_uart_port
*at91_port
= (struct at91_uart_port
*) port
;
879 if (device_may_wakeup(&pdev
->dev
) && !at91_suspend_entering_slow_clock())
880 enable_irq_wake(port
->irq
);
882 disable_irq_wake(port
->irq
);
883 uart_suspend_port(&at91_uart
, port
);
884 at91_port
->suspended
= 1;
890 static int at91_serial_resume(struct platform_device
*pdev
)
892 struct uart_port
*port
= platform_get_drvdata(pdev
);
893 struct at91_uart_port
*at91_port
= (struct at91_uart_port
*) port
;
895 if (at91_port
->suspended
) {
896 uart_resume_port(&at91_uart
, port
);
897 at91_port
->suspended
= 0;
903 #define at91_serial_suspend NULL
904 #define at91_serial_resume NULL
907 static int __devinit
at91_serial_probe(struct platform_device
*pdev
)
909 struct at91_uart_port
*port
;
912 port
= &at91_ports
[pdev
->id
];
913 at91_init_port(port
, pdev
);
915 ret
= uart_add_one_port(&at91_uart
, &port
->uart
);
917 device_init_wakeup(&pdev
->dev
, 1);
918 platform_set_drvdata(pdev
, port
);
924 static int __devexit
at91_serial_remove(struct platform_device
*pdev
)
926 struct uart_port
*port
= platform_get_drvdata(pdev
);
927 struct at91_uart_port
*at91_port
= (struct at91_uart_port
*) port
;
930 clk_disable(at91_port
->clk
);
931 clk_put(at91_port
->clk
);
933 device_init_wakeup(&pdev
->dev
, 0);
934 platform_set_drvdata(pdev
, NULL
);
937 ret
= uart_remove_one_port(&at91_uart
, port
);
944 static struct platform_driver at91_serial_driver
= {
945 .probe
= at91_serial_probe
,
946 .remove
= __devexit_p(at91_serial_remove
),
947 .suspend
= at91_serial_suspend
,
948 .resume
= at91_serial_resume
,
950 .name
= "atmel_usart",
951 .owner
= THIS_MODULE
,
955 static int __init
at91_serial_init(void)
959 ret
= uart_register_driver(&at91_uart
);
963 ret
= platform_driver_register(&at91_serial_driver
);
965 uart_unregister_driver(&at91_uart
);
970 static void __exit
at91_serial_exit(void)
972 platform_driver_unregister(&at91_serial_driver
);
973 uart_unregister_driver(&at91_uart
);
976 module_init(at91_serial_init
);
977 module_exit(at91_serial_exit
);
979 MODULE_AUTHOR("Rick Bronson");
980 MODULE_DESCRIPTION("AT91 generic serial port driver");
981 MODULE_LICENSE("GPL");