2 * linux/drivers/char/atmel_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>
36 #include <linux/atmel_pdc.h>
37 #include <linux/atmel_serial.h>
41 #include <asm/mach/serial_at91.h>
42 #include <asm/arch/board.h>
45 #include <asm/arch/cpu.h>
46 #include <asm/arch/gpio.h>
49 #if defined(CONFIG_SERIAL_ATMEL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
53 #include <linux/serial_core.h>
55 #ifdef CONFIG_SERIAL_ATMEL_TTYAT
57 /* Use device name ttyAT, major 204 and minor 154-169. This is necessary if we
58 * should coexist with the 8250 driver, such as if we have an external 16C550
60 #define SERIAL_ATMEL_MAJOR 204
61 #define MINOR_START 154
62 #define ATMEL_DEVICENAME "ttyAT"
66 /* Use device name ttyS, major 4, minor 64-68. This is the usual serial port
67 * name, but it is legally reserved for the 8250 driver. */
68 #define SERIAL_ATMEL_MAJOR TTY_MAJOR
69 #define MINOR_START 64
70 #define ATMEL_DEVICENAME "ttyS"
74 #define ATMEL_ISR_PASS_LIMIT 256
76 #define UART_PUT_CR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_CR)
77 #define UART_GET_MR(port) __raw_readl((port)->membase + ATMEL_US_MR)
78 #define UART_PUT_MR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_MR)
79 #define UART_PUT_IER(port,v) __raw_writel(v, (port)->membase + ATMEL_US_IER)
80 #define UART_PUT_IDR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_IDR)
81 #define UART_GET_IMR(port) __raw_readl((port)->membase + ATMEL_US_IMR)
82 #define UART_GET_CSR(port) __raw_readl((port)->membase + ATMEL_US_CSR)
83 #define UART_GET_CHAR(port) __raw_readl((port)->membase + ATMEL_US_RHR)
84 #define UART_PUT_CHAR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_THR)
85 #define UART_GET_BRGR(port) __raw_readl((port)->membase + ATMEL_US_BRGR)
86 #define UART_PUT_BRGR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_BRGR)
87 #define UART_PUT_RTOR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_RTOR)
89 // #define UART_GET_CR(port) __raw_readl((port)->membase + ATMEL_US_CR) // is write-only
92 #define UART_PUT_PTCR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_PTCR)
93 #define UART_GET_PTSR(port) __raw_readl((port)->membase + ATMEL_PDC_PTSR)
95 #define UART_PUT_RPR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_RPR)
96 #define UART_GET_RPR(port) __raw_readl((port)->membase + ATMEL_PDC_RPR)
97 #define UART_PUT_RCR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_RCR)
98 #define UART_PUT_RNPR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_RNPR)
99 #define UART_PUT_RNCR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_RNCR)
101 #define UART_PUT_TPR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_TPR)
102 #define UART_PUT_TCR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_TCR)
103 //#define UART_PUT_TNPR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_TNPR)
104 //#define UART_PUT_TNCR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_TNCR)
106 static int (*atmel_open_hook
)(struct uart_port
*);
107 static void (*atmel_close_hook
)(struct uart_port
*);
110 * We wrap our port structure around the generic uart_port.
112 struct atmel_uart_port
{
113 struct uart_port uart
; /* uart */
114 struct clk
*clk
; /* uart clock */
115 unsigned short suspended
; /* is port suspended? */
116 int break_active
; /* break being received */
119 static struct atmel_uart_port atmel_ports
[ATMEL_MAX_UART
];
122 static struct console atmel_console
;
126 * Return TIOCSER_TEMT when transmitter FIFO and Shift register is empty.
128 static u_int
atmel_tx_empty(struct uart_port
*port
)
130 return (UART_GET_CSR(port
) & ATMEL_US_TXEMPTY
) ? TIOCSER_TEMT
: 0;
134 * Set state of the modem control output lines
136 static void atmel_set_mctrl(struct uart_port
*port
, u_int mctrl
)
138 unsigned int control
= 0;
141 #ifdef CONFIG_ARCH_AT91RM9200
142 if (cpu_is_at91rm9200()) {
144 * AT91RM9200 Errata #39: RTS0 is not internally connected to PA21.
145 * We need to drive the pin manually.
147 if (port
->mapbase
== AT91RM9200_BASE_US0
) {
148 if (mctrl
& TIOCM_RTS
)
149 at91_set_gpio_value(AT91_PIN_PA21
, 0);
151 at91_set_gpio_value(AT91_PIN_PA21
, 1);
156 if (mctrl
& TIOCM_RTS
)
157 control
|= ATMEL_US_RTSEN
;
159 control
|= ATMEL_US_RTSDIS
;
161 if (mctrl
& TIOCM_DTR
)
162 control
|= ATMEL_US_DTREN
;
164 control
|= ATMEL_US_DTRDIS
;
166 UART_PUT_CR(port
, control
);
168 /* Local loopback mode? */
169 mode
= UART_GET_MR(port
) & ~ATMEL_US_CHMODE
;
170 if (mctrl
& TIOCM_LOOP
)
171 mode
|= ATMEL_US_CHMODE_LOC_LOOP
;
173 mode
|= ATMEL_US_CHMODE_NORMAL
;
174 UART_PUT_MR(port
, mode
);
178 * Get state of the modem control input lines
180 static u_int
atmel_get_mctrl(struct uart_port
*port
)
182 unsigned int status
, ret
= 0;
184 status
= UART_GET_CSR(port
);
187 * The control signals are active low.
189 if (!(status
& ATMEL_US_DCD
))
191 if (!(status
& ATMEL_US_CTS
))
193 if (!(status
& ATMEL_US_DSR
))
195 if (!(status
& ATMEL_US_RI
))
204 static void atmel_stop_tx(struct uart_port
*port
)
206 UART_PUT_IDR(port
, ATMEL_US_TXRDY
);
210 * Start transmitting.
212 static void atmel_start_tx(struct uart_port
*port
)
214 UART_PUT_IER(port
, ATMEL_US_TXRDY
);
218 * Stop receiving - port is in process of being closed.
220 static void atmel_stop_rx(struct uart_port
*port
)
222 UART_PUT_IDR(port
, ATMEL_US_RXRDY
);
226 * Enable modem status interrupts
228 static void atmel_enable_ms(struct uart_port
*port
)
230 UART_PUT_IER(port
, ATMEL_US_RIIC
| ATMEL_US_DSRIC
| ATMEL_US_DCDIC
| ATMEL_US_CTSIC
);
234 * Control the transmission of a break signal
236 static void atmel_break_ctl(struct uart_port
*port
, int break_state
)
238 if (break_state
!= 0)
239 UART_PUT_CR(port
, ATMEL_US_STTBRK
); /* start break */
241 UART_PUT_CR(port
, ATMEL_US_STPBRK
); /* stop break */
245 * Characters received (called from interrupt handler)
247 static void atmel_rx_chars(struct uart_port
*port
)
249 struct atmel_uart_port
*atmel_port
= (struct atmel_uart_port
*) port
;
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
266 | ATMEL_US_OVRE
| ATMEL_US_RXBRK
)
267 || atmel_port
->break_active
)) {
268 UART_PUT_CR(port
, ATMEL_US_RSTSTA
); /* clear error */
269 if (status
& ATMEL_US_RXBRK
270 && !atmel_port
->break_active
) {
271 status
&= ~(ATMEL_US_PARE
| ATMEL_US_FRAME
); /* ignore side-effect */
273 atmel_port
->break_active
= 1;
274 UART_PUT_IER(port
, ATMEL_US_RXBRK
);
275 if (uart_handle_break(port
))
279 * This is either the end-of-break
280 * condition or we've received at
281 * least one character without RXBRK
282 * being set. In both cases, the next
283 * RXBRK will indicate start-of-break.
285 UART_PUT_IDR(port
, ATMEL_US_RXBRK
);
286 status
&= ~ATMEL_US_RXBRK
;
287 atmel_port
->break_active
= 0;
289 if (status
& ATMEL_US_PARE
)
290 port
->icount
.parity
++;
291 if (status
& ATMEL_US_FRAME
)
292 port
->icount
.frame
++;
293 if (status
& ATMEL_US_OVRE
)
294 port
->icount
.overrun
++;
296 status
&= port
->read_status_mask
;
298 if (status
& ATMEL_US_RXBRK
)
300 else if (status
& ATMEL_US_PARE
)
302 else if (status
& ATMEL_US_FRAME
)
306 if (uart_handle_sysrq_char(port
, ch
))
309 uart_insert_char(port
, status
, ATMEL_US_OVRE
, ch
, flg
);
312 status
= UART_GET_CSR(port
);
315 tty_flip_buffer_push(tty
);
319 * Transmit characters (called from interrupt handler)
321 static void atmel_tx_chars(struct uart_port
*port
)
323 struct circ_buf
*xmit
= &port
->info
->xmit
;
326 UART_PUT_CHAR(port
, port
->x_char
);
331 if (uart_circ_empty(xmit
) || uart_tx_stopped(port
)) {
336 while (UART_GET_CSR(port
) & ATMEL_US_TXRDY
) {
337 UART_PUT_CHAR(port
, xmit
->buf
[xmit
->tail
]);
338 xmit
->tail
= (xmit
->tail
+ 1) & (UART_XMIT_SIZE
- 1);
340 if (uart_circ_empty(xmit
))
344 if (uart_circ_chars_pending(xmit
) < WAKEUP_CHARS
)
345 uart_write_wakeup(port
);
347 if (uart_circ_empty(xmit
))
354 static irqreturn_t
atmel_interrupt(int irq
, void *dev_id
)
356 struct uart_port
*port
= dev_id
;
357 struct atmel_uart_port
*atmel_port
= (struct atmel_uart_port
*) port
;
358 unsigned int status
, pending
, pass_counter
= 0;
360 status
= UART_GET_CSR(port
);
361 pending
= status
& UART_GET_IMR(port
);
363 /* Interrupt receive */
364 if (pending
& ATMEL_US_RXRDY
)
365 atmel_rx_chars(port
);
366 else if (pending
& ATMEL_US_RXBRK
) {
368 * End of break detected. If it came along
369 * with a character, atmel_rx_chars will
372 UART_PUT_CR(port
, ATMEL_US_RSTSTA
);
373 UART_PUT_IDR(port
, ATMEL_US_RXBRK
);
374 atmel_port
->break_active
= 0;
377 // TODO: All reads to CSR will clear these interrupts!
378 if (pending
& ATMEL_US_RIIC
) port
->icount
.rng
++;
379 if (pending
& ATMEL_US_DSRIC
) port
->icount
.dsr
++;
380 if (pending
& ATMEL_US_DCDIC
)
381 uart_handle_dcd_change(port
, !(status
& ATMEL_US_DCD
));
382 if (pending
& ATMEL_US_CTSIC
)
383 uart_handle_cts_change(port
, !(status
& ATMEL_US_CTS
));
384 if (pending
& (ATMEL_US_RIIC
| ATMEL_US_DSRIC
| ATMEL_US_DCDIC
| ATMEL_US_CTSIC
))
385 wake_up_interruptible(&port
->info
->delta_msr_wait
);
387 /* Interrupt transmit */
388 if (pending
& ATMEL_US_TXRDY
)
389 atmel_tx_chars(port
);
391 if (pass_counter
++ > ATMEL_ISR_PASS_LIMIT
)
394 status
= UART_GET_CSR(port
);
395 pending
= status
& UART_GET_IMR(port
);
401 * Perform initialization and enable port for reception
403 static int atmel_startup(struct uart_port
*port
)
408 * Ensure that no interrupts are enabled otherwise when
409 * request_irq() is called we could get stuck trying to
410 * handle an unexpected interrupt
412 UART_PUT_IDR(port
, -1);
417 retval
= request_irq(port
->irq
, atmel_interrupt
, IRQF_SHARED
, "atmel_serial", port
);
419 printk("atmel_serial: atmel_startup - Can't get irq\n");
424 * If there is a specific "open" function (to register
425 * control line interrupts)
427 if (atmel_open_hook
) {
428 retval
= atmel_open_hook(port
);
430 free_irq(port
->irq
, port
);
436 * Finally, enable the serial port
438 UART_PUT_CR(port
, ATMEL_US_RSTSTA
| ATMEL_US_RSTRX
);
439 UART_PUT_CR(port
, ATMEL_US_TXEN
| ATMEL_US_RXEN
); /* enable xmit & rcvr */
441 UART_PUT_IER(port
, ATMEL_US_RXRDY
); /* enable receive only */
449 static void atmel_shutdown(struct uart_port
*port
)
452 * Disable all interrupts, port and break condition.
454 UART_PUT_CR(port
, ATMEL_US_RSTSTA
);
455 UART_PUT_IDR(port
, -1);
460 free_irq(port
->irq
, port
);
463 * If there is a specific "close" function (to unregister
464 * control line interrupts)
466 if (atmel_close_hook
)
467 atmel_close_hook(port
);
471 * Power / Clock management.
473 static void atmel_serial_pm(struct uart_port
*port
, unsigned int state
, unsigned int oldstate
)
475 struct atmel_uart_port
*atmel_port
= (struct atmel_uart_port
*) port
;
480 * Enable the peripheral clock for this serial port.
481 * This is called on uart_open() or a resume event.
483 clk_enable(atmel_port
->clk
);
487 * Disable the peripheral clock for this serial port.
488 * This is called on uart_close() or a suspend event.
490 clk_disable(atmel_port
->clk
);
493 printk(KERN_ERR
"atmel_serial: unknown pm %d\n", state
);
498 * Change the port parameters
500 static void atmel_set_termios(struct uart_port
*port
, struct ktermios
* termios
, struct ktermios
* old
)
503 unsigned int mode
, imr
, quot
, baud
;
505 /* Get current mode register */
506 mode
= UART_GET_MR(port
) & ~(ATMEL_US_USCLKS
| ATMEL_US_CHRL
| ATMEL_US_NBSTOP
| ATMEL_US_PAR
);
508 baud
= uart_get_baud_rate(port
, termios
, old
, 0, port
->uartclk
/16);
509 quot
= uart_get_divisor(port
, baud
);
511 if (quot
> 65535) { /* BRGR is 16-bit, so switch to slower clock */
513 mode
|= ATMEL_US_USCLKS_MCK_DIV8
;
517 switch (termios
->c_cflag
& CSIZE
) {
519 mode
|= ATMEL_US_CHRL_5
;
522 mode
|= ATMEL_US_CHRL_6
;
525 mode
|= ATMEL_US_CHRL_7
;
528 mode
|= ATMEL_US_CHRL_8
;
533 if (termios
->c_cflag
& CSTOPB
)
534 mode
|= ATMEL_US_NBSTOP_2
;
537 if (termios
->c_cflag
& PARENB
) {
538 if (termios
->c_cflag
& CMSPAR
) { /* Mark or Space parity */
539 if (termios
->c_cflag
& PARODD
)
540 mode
|= ATMEL_US_PAR_MARK
;
542 mode
|= ATMEL_US_PAR_SPACE
;
544 else if (termios
->c_cflag
& PARODD
)
545 mode
|= ATMEL_US_PAR_ODD
;
547 mode
|= ATMEL_US_PAR_EVEN
;
550 mode
|= ATMEL_US_PAR_NONE
;
552 spin_lock_irqsave(&port
->lock
, flags
);
554 port
->read_status_mask
= ATMEL_US_OVRE
;
555 if (termios
->c_iflag
& INPCK
)
556 port
->read_status_mask
|= (ATMEL_US_FRAME
| ATMEL_US_PARE
);
557 if (termios
->c_iflag
& (BRKINT
| PARMRK
))
558 port
->read_status_mask
|= ATMEL_US_RXBRK
;
561 * Characters to ignore
563 port
->ignore_status_mask
= 0;
564 if (termios
->c_iflag
& IGNPAR
)
565 port
->ignore_status_mask
|= (ATMEL_US_FRAME
| ATMEL_US_PARE
);
566 if (termios
->c_iflag
& IGNBRK
) {
567 port
->ignore_status_mask
|= ATMEL_US_RXBRK
;
569 * If we're ignoring parity and break indicators,
570 * ignore overruns too (for real raw support).
572 if (termios
->c_iflag
& IGNPAR
)
573 port
->ignore_status_mask
|= ATMEL_US_OVRE
;
576 // TODO: Ignore all characters if CREAD is set.
578 /* update the per-port timeout */
579 uart_update_timeout(port
, termios
->c_cflag
, baud
);
581 /* disable interrupts and drain transmitter */
582 imr
= UART_GET_IMR(port
); /* get interrupt mask */
583 UART_PUT_IDR(port
, -1); /* disable all interrupts */
584 while (!(UART_GET_CSR(port
) & ATMEL_US_TXEMPTY
)) { barrier(); }
586 /* disable receiver and transmitter */
587 UART_PUT_CR(port
, ATMEL_US_TXDIS
| ATMEL_US_RXDIS
);
589 /* set the parity, stop bits and data size */
590 UART_PUT_MR(port
, mode
);
592 /* set the baud rate */
593 UART_PUT_BRGR(port
, quot
);
594 UART_PUT_CR(port
, ATMEL_US_RSTSTA
| ATMEL_US_RSTRX
);
595 UART_PUT_CR(port
, ATMEL_US_TXEN
| ATMEL_US_RXEN
);
597 /* restore interrupts */
598 UART_PUT_IER(port
, imr
);
600 /* CTS flow-control and modem-status interrupts */
601 if (UART_ENABLE_MS(port
, termios
->c_cflag
))
602 port
->ops
->enable_ms(port
);
604 spin_unlock_irqrestore(&port
->lock
, flags
);
608 * Return string describing the specified port
610 static const char *atmel_type(struct uart_port
*port
)
612 return (port
->type
== PORT_ATMEL
) ? "ATMEL_SERIAL" : NULL
;
616 * Release the memory region(s) being used by 'port'.
618 static void atmel_release_port(struct uart_port
*port
)
620 struct platform_device
*pdev
= to_platform_device(port
->dev
);
621 int size
= pdev
->resource
[0].end
- pdev
->resource
[0].start
+ 1;
623 release_mem_region(port
->mapbase
, size
);
625 if (port
->flags
& UPF_IOREMAP
) {
626 iounmap(port
->membase
);
627 port
->membase
= NULL
;
632 * Request the memory region(s) being used by 'port'.
634 static int atmel_request_port(struct uart_port
*port
)
636 struct platform_device
*pdev
= to_platform_device(port
->dev
);
637 int size
= pdev
->resource
[0].end
- pdev
->resource
[0].start
+ 1;
639 if (!request_mem_region(port
->mapbase
, size
, "atmel_serial"))
642 if (port
->flags
& UPF_IOREMAP
) {
643 port
->membase
= ioremap(port
->mapbase
, size
);
644 if (port
->membase
== NULL
) {
645 release_mem_region(port
->mapbase
, size
);
654 * Configure/autoconfigure the port.
656 static void atmel_config_port(struct uart_port
*port
, int flags
)
658 if (flags
& UART_CONFIG_TYPE
) {
659 port
->type
= PORT_ATMEL
;
660 atmel_request_port(port
);
665 * Verify the new serial_struct (for TIOCSSERIAL).
667 static int atmel_verify_port(struct uart_port
*port
, struct serial_struct
*ser
)
670 if (ser
->type
!= PORT_UNKNOWN
&& ser
->type
!= PORT_ATMEL
)
672 if (port
->irq
!= ser
->irq
)
674 if (ser
->io_type
!= SERIAL_IO_MEM
)
676 if (port
->uartclk
/ 16 != ser
->baud_base
)
678 if ((void *)port
->mapbase
!= ser
->iomem_base
)
680 if (port
->iobase
!= ser
->port
)
687 static struct uart_ops atmel_pops
= {
688 .tx_empty
= atmel_tx_empty
,
689 .set_mctrl
= atmel_set_mctrl
,
690 .get_mctrl
= atmel_get_mctrl
,
691 .stop_tx
= atmel_stop_tx
,
692 .start_tx
= atmel_start_tx
,
693 .stop_rx
= atmel_stop_rx
,
694 .enable_ms
= atmel_enable_ms
,
695 .break_ctl
= atmel_break_ctl
,
696 .startup
= atmel_startup
,
697 .shutdown
= atmel_shutdown
,
698 .set_termios
= atmel_set_termios
,
700 .release_port
= atmel_release_port
,
701 .request_port
= atmel_request_port
,
702 .config_port
= atmel_config_port
,
703 .verify_port
= atmel_verify_port
,
704 .pm
= atmel_serial_pm
,
708 * Configure the port from the platform device resource info.
710 static void __devinit
atmel_init_port(struct atmel_uart_port
*atmel_port
, struct platform_device
*pdev
)
712 struct uart_port
*port
= &atmel_port
->uart
;
713 struct atmel_uart_data
*data
= pdev
->dev
.platform_data
;
715 port
->iotype
= UPIO_MEM
;
716 port
->flags
= UPF_BOOT_AUTOCONF
;
717 port
->ops
= &atmel_pops
;
719 port
->line
= pdev
->id
;
720 port
->dev
= &pdev
->dev
;
722 port
->mapbase
= pdev
->resource
[0].start
;
723 port
->irq
= pdev
->resource
[1].start
;
726 /* Already mapped by setup code */
727 port
->membase
= data
->regs
;
729 port
->flags
|= UPF_IOREMAP
;
730 port
->membase
= NULL
;
733 if (!atmel_port
->clk
) { /* for console, the clock could already be configured */
734 atmel_port
->clk
= clk_get(&pdev
->dev
, "usart");
735 clk_enable(atmel_port
->clk
);
736 port
->uartclk
= clk_get_rate(atmel_port
->clk
);
741 * Register board-specific modem-control line handlers.
743 void __init
atmel_register_uart_fns(struct atmel_port_fns
*fns
)
746 atmel_pops
.enable_ms
= fns
->enable_ms
;
748 atmel_pops
.get_mctrl
= fns
->get_mctrl
;
750 atmel_pops
.set_mctrl
= fns
->set_mctrl
;
751 atmel_open_hook
= fns
->open
;
752 atmel_close_hook
= fns
->close
;
753 atmel_pops
.pm
= fns
->pm
;
754 atmel_pops
.set_wake
= fns
->set_wake
;
758 #ifdef CONFIG_SERIAL_ATMEL_CONSOLE
759 static void atmel_console_putchar(struct uart_port
*port
, int ch
)
761 while (!(UART_GET_CSR(port
) & ATMEL_US_TXRDY
))
763 UART_PUT_CHAR(port
, ch
);
767 * Interrupts are disabled on entering
769 static void atmel_console_write(struct console
*co
, const char *s
, u_int count
)
771 struct uart_port
*port
= &atmel_ports
[co
->index
].uart
;
772 unsigned int status
, imr
;
775 * First, save IMR and then disable interrupts
777 imr
= UART_GET_IMR(port
); /* get interrupt mask */
778 UART_PUT_IDR(port
, ATMEL_US_RXRDY
| ATMEL_US_TXRDY
);
780 uart_console_write(port
, s
, count
, atmel_console_putchar
);
783 * Finally, wait for transmitter to become empty
787 status
= UART_GET_CSR(port
);
788 } while (!(status
& ATMEL_US_TXRDY
));
789 UART_PUT_IER(port
, imr
); /* set interrupts back the way they were */
793 * If the port was already initialised (eg, by a boot loader), try to determine
796 static void __init
atmel_console_get_options(struct uart_port
*port
, int *baud
, int *parity
, int *bits
)
798 unsigned int mr
, quot
;
800 // TODO: CR is a write-only register
803 // cr = UART_GET_CR(port) & (ATMEL_US_RXEN | ATMEL_US_TXEN);
804 // if (cr == (ATMEL_US_RXEN | ATMEL_US_TXEN)) {
805 // /* ok, the port was enabled */
808 mr
= UART_GET_MR(port
) & ATMEL_US_CHRL
;
809 if (mr
== ATMEL_US_CHRL_8
)
814 mr
= UART_GET_MR(port
) & ATMEL_US_PAR
;
815 if (mr
== ATMEL_US_PAR_EVEN
)
817 else if (mr
== ATMEL_US_PAR_ODD
)
821 * The serial core only rounds down when matching this to a
822 * supported baud rate. Make sure we don't end up slightly
823 * lower than one of those, as it would make us fall through
824 * to a much lower baud rate than we really want.
826 quot
= UART_GET_BRGR(port
);
827 *baud
= port
->uartclk
/ (16 * (quot
- 1));
830 static int __init
atmel_console_setup(struct console
*co
, char *options
)
832 struct uart_port
*port
= &atmel_ports
[co
->index
].uart
;
838 if (port
->membase
== 0) /* Port not initialized yet - delay setup */
841 UART_PUT_IDR(port
, -1); /* disable interrupts */
842 UART_PUT_CR(port
, ATMEL_US_RSTSTA
| ATMEL_US_RSTRX
);
843 UART_PUT_CR(port
, ATMEL_US_TXEN
| ATMEL_US_RXEN
);
846 uart_parse_options(options
, &baud
, &parity
, &bits
, &flow
);
848 atmel_console_get_options(port
, &baud
, &parity
, &bits
);
850 return uart_set_options(port
, co
, baud
, parity
, bits
, flow
);
853 static struct uart_driver atmel_uart
;
855 static struct console atmel_console
= {
856 .name
= ATMEL_DEVICENAME
,
857 .write
= atmel_console_write
,
858 .device
= uart_console_device
,
859 .setup
= atmel_console_setup
,
860 .flags
= CON_PRINTBUFFER
,
865 #define ATMEL_CONSOLE_DEVICE &atmel_console
868 * Early console initialization (before VM subsystem initialized).
870 static int __init
atmel_console_init(void)
872 if (atmel_default_console_device
) {
873 add_preferred_console(ATMEL_DEVICENAME
, atmel_default_console_device
->id
, NULL
);
874 atmel_init_port(&(atmel_ports
[atmel_default_console_device
->id
]), atmel_default_console_device
);
875 register_console(&atmel_console
);
880 console_initcall(atmel_console_init
);
883 * Late console initialization.
885 static int __init
atmel_late_console_init(void)
887 if (atmel_default_console_device
&& !(atmel_console
.flags
& CON_ENABLED
))
888 register_console(&atmel_console
);
892 core_initcall(atmel_late_console_init
);
895 #define ATMEL_CONSOLE_DEVICE NULL
898 static struct uart_driver atmel_uart
= {
899 .owner
= THIS_MODULE
,
900 .driver_name
= "atmel_serial",
901 .dev_name
= ATMEL_DEVICENAME
,
902 .major
= SERIAL_ATMEL_MAJOR
,
903 .minor
= MINOR_START
,
904 .nr
= ATMEL_MAX_UART
,
905 .cons
= ATMEL_CONSOLE_DEVICE
,
909 static int atmel_serial_suspend(struct platform_device
*pdev
, pm_message_t state
)
911 struct uart_port
*port
= platform_get_drvdata(pdev
);
912 struct atmel_uart_port
*atmel_port
= (struct atmel_uart_port
*) port
;
914 if (device_may_wakeup(&pdev
->dev
) && !at91_suspend_entering_slow_clock())
915 enable_irq_wake(port
->irq
);
917 uart_suspend_port(&atmel_uart
, port
);
918 atmel_port
->suspended
= 1;
924 static int atmel_serial_resume(struct platform_device
*pdev
)
926 struct uart_port
*port
= platform_get_drvdata(pdev
);
927 struct atmel_uart_port
*atmel_port
= (struct atmel_uart_port
*) port
;
929 if (atmel_port
->suspended
) {
930 uart_resume_port(&atmel_uart
, port
);
931 atmel_port
->suspended
= 0;
934 disable_irq_wake(port
->irq
);
939 #define atmel_serial_suspend NULL
940 #define atmel_serial_resume NULL
943 static int __devinit
atmel_serial_probe(struct platform_device
*pdev
)
945 struct atmel_uart_port
*port
;
948 port
= &atmel_ports
[pdev
->id
];
949 atmel_init_port(port
, pdev
);
951 ret
= uart_add_one_port(&atmel_uart
, &port
->uart
);
953 device_init_wakeup(&pdev
->dev
, 1);
954 platform_set_drvdata(pdev
, port
);
960 static int __devexit
atmel_serial_remove(struct platform_device
*pdev
)
962 struct uart_port
*port
= platform_get_drvdata(pdev
);
963 struct atmel_uart_port
*atmel_port
= (struct atmel_uart_port
*) port
;
966 clk_disable(atmel_port
->clk
);
967 clk_put(atmel_port
->clk
);
969 device_init_wakeup(&pdev
->dev
, 0);
970 platform_set_drvdata(pdev
, NULL
);
973 ret
= uart_remove_one_port(&atmel_uart
, port
);
980 static struct platform_driver atmel_serial_driver
= {
981 .probe
= atmel_serial_probe
,
982 .remove
= __devexit_p(atmel_serial_remove
),
983 .suspend
= atmel_serial_suspend
,
984 .resume
= atmel_serial_resume
,
986 .name
= "atmel_usart",
987 .owner
= THIS_MODULE
,
991 static int __init
atmel_serial_init(void)
995 ret
= uart_register_driver(&atmel_uart
);
999 ret
= platform_driver_register(&atmel_serial_driver
);
1001 uart_unregister_driver(&atmel_uart
);
1006 static void __exit
atmel_serial_exit(void)
1008 platform_driver_unregister(&atmel_serial_driver
);
1009 uart_unregister_driver(&atmel_uart
);
1012 module_init(atmel_serial_init
);
1013 module_exit(atmel_serial_exit
);
1015 MODULE_AUTHOR("Rick Bronson");
1016 MODULE_DESCRIPTION("Atmel AT91 / AT32 serial port driver");
1017 MODULE_LICENSE("GPL");