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 * DMA support added by Chip Coldwell.
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27 #include <linux/module.h>
28 #include <linux/tty.h>
29 #include <linux/ioport.h>
30 #include <linux/slab.h>
31 #include <linux/init.h>
32 #include <linux/serial.h>
33 #include <linux/clk.h>
34 #include <linux/console.h>
35 #include <linux/sysrq.h>
36 #include <linux/tty_flip.h>
37 #include <linux/platform_device.h>
38 #include <linux/dma-mapping.h>
39 #include <linux/atmel_pdc.h>
40 #include <linux/atmel_serial.h>
44 #include <asm/mach/serial_at91.h>
45 #include <asm/arch/board.h>
48 #include <asm/arch/cpu.h>
49 #include <asm/arch/gpio.h>
52 #define PDC_BUFFER_SIZE 512
53 /* Revisit: We should calculate this based on the actual port settings */
54 #define PDC_RX_TIMEOUT (3 * 10) /* 3 bytes */
56 #if defined(CONFIG_SERIAL_ATMEL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
60 #include <linux/serial_core.h>
62 #ifdef CONFIG_SERIAL_ATMEL_TTYAT
64 /* Use device name ttyAT, major 204 and minor 154-169. This is necessary if we
65 * should coexist with the 8250 driver, such as if we have an external 16C550
67 #define SERIAL_ATMEL_MAJOR 204
68 #define MINOR_START 154
69 #define ATMEL_DEVICENAME "ttyAT"
73 /* Use device name ttyS, major 4, minor 64-68. This is the usual serial port
74 * name, but it is legally reserved for the 8250 driver. */
75 #define SERIAL_ATMEL_MAJOR TTY_MAJOR
76 #define MINOR_START 64
77 #define ATMEL_DEVICENAME "ttyS"
81 #define ATMEL_ISR_PASS_LIMIT 256
83 /* UART registers. CR is write-only, hence no GET macro */
84 #define UART_PUT_CR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_CR)
85 #define UART_GET_MR(port) __raw_readl((port)->membase + ATMEL_US_MR)
86 #define UART_PUT_MR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_MR)
87 #define UART_PUT_IER(port,v) __raw_writel(v, (port)->membase + ATMEL_US_IER)
88 #define UART_PUT_IDR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_IDR)
89 #define UART_GET_IMR(port) __raw_readl((port)->membase + ATMEL_US_IMR)
90 #define UART_GET_CSR(port) __raw_readl((port)->membase + ATMEL_US_CSR)
91 #define UART_GET_CHAR(port) __raw_readl((port)->membase + ATMEL_US_RHR)
92 #define UART_PUT_CHAR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_THR)
93 #define UART_GET_BRGR(port) __raw_readl((port)->membase + ATMEL_US_BRGR)
94 #define UART_PUT_BRGR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_BRGR)
95 #define UART_PUT_RTOR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_RTOR)
98 #define UART_PUT_PTCR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_PTCR)
99 #define UART_GET_PTSR(port) __raw_readl((port)->membase + ATMEL_PDC_PTSR)
101 #define UART_PUT_RPR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_RPR)
102 #define UART_GET_RPR(port) __raw_readl((port)->membase + ATMEL_PDC_RPR)
103 #define UART_PUT_RCR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_RCR)
104 #define UART_PUT_RNPR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_RNPR)
105 #define UART_PUT_RNCR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_RNCR)
107 #define UART_PUT_TPR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_TPR)
108 #define UART_PUT_TCR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_TCR)
109 #define UART_GET_TCR(port) __raw_readl((port)->membase + ATMEL_PDC_TCR)
111 static int (*atmel_open_hook
)(struct uart_port
*);
112 static void (*atmel_close_hook
)(struct uart_port
*);
114 struct atmel_dma_buffer
{
117 unsigned int dma_size
;
121 struct atmel_uart_char
{
126 #define ATMEL_SERIAL_RINGSIZE 1024
129 * We wrap our port structure around the generic uart_port.
131 struct atmel_uart_port
{
132 struct uart_port uart
; /* uart */
133 struct clk
*clk
; /* uart clock */
134 unsigned short suspended
; /* is port suspended? */
135 int break_active
; /* break being received */
137 short use_dma_rx
; /* enable PDC receiver */
138 short pdc_rx_idx
; /* current PDC RX buffer */
139 struct atmel_dma_buffer pdc_rx
[2]; /* PDC receier */
141 short use_dma_tx
; /* enable PDC transmitter */
142 struct atmel_dma_buffer pdc_tx
; /* PDC transmitter */
144 struct tasklet_struct tasklet
;
145 unsigned int irq_status
;
146 unsigned int irq_status_prev
;
148 struct circ_buf rx_ring
;
151 static struct atmel_uart_port atmel_ports
[ATMEL_MAX_UART
];
154 static struct console atmel_console
;
157 static inline struct atmel_uart_port
*
158 to_atmel_uart_port(struct uart_port
*uart
)
160 return container_of(uart
, struct atmel_uart_port
, uart
);
163 #ifdef CONFIG_SERIAL_ATMEL_PDC
164 static bool atmel_use_dma_rx(struct uart_port
*port
)
166 struct atmel_uart_port
*atmel_port
= to_atmel_uart_port(port
);
168 return atmel_port
->use_dma_rx
;
171 static bool atmel_use_dma_tx(struct uart_port
*port
)
173 struct atmel_uart_port
*atmel_port
= to_atmel_uart_port(port
);
175 return atmel_port
->use_dma_tx
;
178 static bool atmel_use_dma_rx(struct uart_port
*port
)
183 static bool atmel_use_dma_tx(struct uart_port
*port
)
190 * Return TIOCSER_TEMT when transmitter FIFO and Shift register is empty.
192 static u_int
atmel_tx_empty(struct uart_port
*port
)
194 return (UART_GET_CSR(port
) & ATMEL_US_TXEMPTY
) ? TIOCSER_TEMT
: 0;
198 * Set state of the modem control output lines
200 static void atmel_set_mctrl(struct uart_port
*port
, u_int mctrl
)
202 unsigned int control
= 0;
205 #ifdef CONFIG_ARCH_AT91RM9200
206 if (cpu_is_at91rm9200()) {
208 * AT91RM9200 Errata #39: RTS0 is not internally connected
209 * to PA21. We need to drive the pin manually.
211 if (port
->mapbase
== AT91RM9200_BASE_US0
) {
212 if (mctrl
& TIOCM_RTS
)
213 at91_set_gpio_value(AT91_PIN_PA21
, 0);
215 at91_set_gpio_value(AT91_PIN_PA21
, 1);
220 if (mctrl
& TIOCM_RTS
)
221 control
|= ATMEL_US_RTSEN
;
223 control
|= ATMEL_US_RTSDIS
;
225 if (mctrl
& TIOCM_DTR
)
226 control
|= ATMEL_US_DTREN
;
228 control
|= ATMEL_US_DTRDIS
;
230 UART_PUT_CR(port
, control
);
232 /* Local loopback mode? */
233 mode
= UART_GET_MR(port
) & ~ATMEL_US_CHMODE
;
234 if (mctrl
& TIOCM_LOOP
)
235 mode
|= ATMEL_US_CHMODE_LOC_LOOP
;
237 mode
|= ATMEL_US_CHMODE_NORMAL
;
238 UART_PUT_MR(port
, mode
);
242 * Get state of the modem control input lines
244 static u_int
atmel_get_mctrl(struct uart_port
*port
)
246 unsigned int status
, ret
= 0;
248 status
= UART_GET_CSR(port
);
251 * The control signals are active low.
253 if (!(status
& ATMEL_US_DCD
))
255 if (!(status
& ATMEL_US_CTS
))
257 if (!(status
& ATMEL_US_DSR
))
259 if (!(status
& ATMEL_US_RI
))
268 static void atmel_stop_tx(struct uart_port
*port
)
270 if (atmel_use_dma_tx(port
)) {
271 /* disable PDC transmit */
272 UART_PUT_PTCR(port
, ATMEL_PDC_TXTDIS
);
273 UART_PUT_IDR(port
, ATMEL_US_ENDTX
| ATMEL_US_TXBUFE
);
275 UART_PUT_IDR(port
, ATMEL_US_TXRDY
);
279 * Start transmitting.
281 static void atmel_start_tx(struct uart_port
*port
)
283 if (atmel_use_dma_tx(port
)) {
284 if (UART_GET_PTSR(port
) & ATMEL_PDC_TXTEN
)
285 /* The transmitter is already running. Yes, we
289 UART_PUT_IER(port
, ATMEL_US_ENDTX
| ATMEL_US_TXBUFE
);
290 /* re-enable PDC transmit */
291 UART_PUT_PTCR(port
, ATMEL_PDC_TXTEN
);
293 UART_PUT_IER(port
, ATMEL_US_TXRDY
);
297 * Stop receiving - port is in process of being closed.
299 static void atmel_stop_rx(struct uart_port
*port
)
301 if (atmel_use_dma_rx(port
)) {
302 /* disable PDC receive */
303 UART_PUT_PTCR(port
, ATMEL_PDC_RXTDIS
);
304 UART_PUT_IDR(port
, ATMEL_US_ENDRX
| ATMEL_US_TIMEOUT
);
306 UART_PUT_IDR(port
, ATMEL_US_RXRDY
);
310 * Enable modem status interrupts
312 static void atmel_enable_ms(struct uart_port
*port
)
314 UART_PUT_IER(port
, ATMEL_US_RIIC
| ATMEL_US_DSRIC
315 | ATMEL_US_DCDIC
| ATMEL_US_CTSIC
);
319 * Control the transmission of a break signal
321 static void atmel_break_ctl(struct uart_port
*port
, int break_state
)
323 if (break_state
!= 0)
324 UART_PUT_CR(port
, ATMEL_US_STTBRK
); /* start break */
326 UART_PUT_CR(port
, ATMEL_US_STPBRK
); /* stop break */
330 * Stores the incoming character in the ring buffer
333 atmel_buffer_rx_char(struct uart_port
*port
, unsigned int status
,
336 struct atmel_uart_port
*atmel_port
= to_atmel_uart_port(port
);
337 struct circ_buf
*ring
= &atmel_port
->rx_ring
;
338 struct atmel_uart_char
*c
;
340 if (!CIRC_SPACE(ring
->head
, ring
->tail
, ATMEL_SERIAL_RINGSIZE
))
341 /* Buffer overflow, ignore char */
344 c
= &((struct atmel_uart_char
*)ring
->buf
)[ring
->head
];
348 /* Make sure the character is stored before we update head. */
351 ring
->head
= (ring
->head
+ 1) & (ATMEL_SERIAL_RINGSIZE
- 1);
355 * Deal with parity, framing and overrun errors.
357 static void atmel_pdc_rxerr(struct uart_port
*port
, unsigned int status
)
360 UART_PUT_CR(port
, ATMEL_US_RSTSTA
);
362 if (status
& ATMEL_US_RXBRK
) {
363 /* ignore side-effect */
364 status
&= ~(ATMEL_US_PARE
| ATMEL_US_FRAME
);
367 if (status
& ATMEL_US_PARE
)
368 port
->icount
.parity
++;
369 if (status
& ATMEL_US_FRAME
)
370 port
->icount
.frame
++;
371 if (status
& ATMEL_US_OVRE
)
372 port
->icount
.overrun
++;
376 * Characters received (called from interrupt handler)
378 static void atmel_rx_chars(struct uart_port
*port
)
380 struct atmel_uart_port
*atmel_port
= to_atmel_uart_port(port
);
381 unsigned int status
, ch
;
383 status
= UART_GET_CSR(port
);
384 while (status
& ATMEL_US_RXRDY
) {
385 ch
= UART_GET_CHAR(port
);
388 * note that the error handling code is
389 * out of the main execution path
391 if (unlikely(status
& (ATMEL_US_PARE
| ATMEL_US_FRAME
392 | ATMEL_US_OVRE
| ATMEL_US_RXBRK
)
393 || atmel_port
->break_active
)) {
396 UART_PUT_CR(port
, ATMEL_US_RSTSTA
);
398 if (status
& ATMEL_US_RXBRK
399 && !atmel_port
->break_active
) {
400 atmel_port
->break_active
= 1;
401 UART_PUT_IER(port
, ATMEL_US_RXBRK
);
404 * This is either the end-of-break
405 * condition or we've received at
406 * least one character without RXBRK
407 * being set. In both cases, the next
408 * RXBRK will indicate start-of-break.
410 UART_PUT_IDR(port
, ATMEL_US_RXBRK
);
411 status
&= ~ATMEL_US_RXBRK
;
412 atmel_port
->break_active
= 0;
416 atmel_buffer_rx_char(port
, status
, ch
);
417 status
= UART_GET_CSR(port
);
420 tasklet_schedule(&atmel_port
->tasklet
);
424 * Transmit characters (called from tasklet with TXRDY interrupt
427 static void atmel_tx_chars(struct uart_port
*port
)
429 struct circ_buf
*xmit
= &port
->info
->xmit
;
431 if (port
->x_char
&& UART_GET_CSR(port
) & ATMEL_US_TXRDY
) {
432 UART_PUT_CHAR(port
, port
->x_char
);
436 if (uart_circ_empty(xmit
) || uart_tx_stopped(port
))
439 while (UART_GET_CSR(port
) & ATMEL_US_TXRDY
) {
440 UART_PUT_CHAR(port
, xmit
->buf
[xmit
->tail
]);
441 xmit
->tail
= (xmit
->tail
+ 1) & (UART_XMIT_SIZE
- 1);
443 if (uart_circ_empty(xmit
))
447 if (uart_circ_chars_pending(xmit
) < WAKEUP_CHARS
)
448 uart_write_wakeup(port
);
450 if (!uart_circ_empty(xmit
))
451 UART_PUT_IER(port
, ATMEL_US_TXRDY
);
455 * receive interrupt handler.
458 atmel_handle_receive(struct uart_port
*port
, unsigned int pending
)
460 struct atmel_uart_port
*atmel_port
= to_atmel_uart_port(port
);
462 if (atmel_use_dma_rx(port
)) {
464 * PDC receive. Just schedule the tasklet and let it
465 * figure out the details.
467 * TODO: We're not handling error flags correctly at
470 if (pending
& (ATMEL_US_ENDRX
| ATMEL_US_TIMEOUT
)) {
471 UART_PUT_IDR(port
, (ATMEL_US_ENDRX
472 | ATMEL_US_TIMEOUT
));
473 tasklet_schedule(&atmel_port
->tasklet
);
476 if (pending
& (ATMEL_US_RXBRK
| ATMEL_US_OVRE
|
477 ATMEL_US_FRAME
| ATMEL_US_PARE
))
478 atmel_pdc_rxerr(port
, pending
);
481 /* Interrupt receive */
482 if (pending
& ATMEL_US_RXRDY
)
483 atmel_rx_chars(port
);
484 else if (pending
& ATMEL_US_RXBRK
) {
486 * End of break detected. If it came along with a
487 * character, atmel_rx_chars will handle it.
489 UART_PUT_CR(port
, ATMEL_US_RSTSTA
);
490 UART_PUT_IDR(port
, ATMEL_US_RXBRK
);
491 atmel_port
->break_active
= 0;
496 * transmit interrupt handler. (Transmit is IRQF_NODELAY safe)
499 atmel_handle_transmit(struct uart_port
*port
, unsigned int pending
)
501 struct atmel_uart_port
*atmel_port
= to_atmel_uart_port(port
);
503 if (atmel_use_dma_tx(port
)) {
505 if (pending
& (ATMEL_US_ENDTX
| ATMEL_US_TXBUFE
)) {
506 UART_PUT_IDR(port
, ATMEL_US_ENDTX
| ATMEL_US_TXBUFE
);
507 tasklet_schedule(&atmel_port
->tasklet
);
510 /* Interrupt transmit */
511 if (pending
& ATMEL_US_TXRDY
) {
512 UART_PUT_IDR(port
, ATMEL_US_TXRDY
);
513 tasklet_schedule(&atmel_port
->tasklet
);
519 * status flags interrupt handler.
522 atmel_handle_status(struct uart_port
*port
, unsigned int pending
,
525 struct atmel_uart_port
*atmel_port
= to_atmel_uart_port(port
);
527 if (pending
& (ATMEL_US_RIIC
| ATMEL_US_DSRIC
| ATMEL_US_DCDIC
529 atmel_port
->irq_status
= status
;
530 tasklet_schedule(&atmel_port
->tasklet
);
537 static irqreturn_t
atmel_interrupt(int irq
, void *dev_id
)
539 struct uart_port
*port
= dev_id
;
540 unsigned int status
, pending
, pass_counter
= 0;
543 status
= UART_GET_CSR(port
);
544 pending
= status
& UART_GET_IMR(port
);
548 atmel_handle_receive(port
, pending
);
549 atmel_handle_status(port
, pending
, status
);
550 atmel_handle_transmit(port
, pending
);
551 } while (pass_counter
++ < ATMEL_ISR_PASS_LIMIT
);
553 return pass_counter
? IRQ_HANDLED
: IRQ_NONE
;
557 * Called from tasklet with ENDTX and TXBUFE interrupts disabled.
559 static void atmel_tx_dma(struct uart_port
*port
)
561 struct atmel_uart_port
*atmel_port
= to_atmel_uart_port(port
);
562 struct circ_buf
*xmit
= &port
->info
->xmit
;
563 struct atmel_dma_buffer
*pdc
= &atmel_port
->pdc_tx
;
566 /* nothing left to transmit? */
567 if (UART_GET_TCR(port
))
570 xmit
->tail
+= pdc
->ofs
;
571 xmit
->tail
&= UART_XMIT_SIZE
- 1;
573 port
->icount
.tx
+= pdc
->ofs
;
576 /* more to transmit - setup next transfer */
578 /* disable PDC transmit */
579 UART_PUT_PTCR(port
, ATMEL_PDC_TXTDIS
);
581 if (!uart_circ_empty(xmit
)) {
582 dma_sync_single_for_device(port
->dev
,
587 count
= CIRC_CNT_TO_END(xmit
->head
, xmit
->tail
, UART_XMIT_SIZE
);
590 UART_PUT_TPR(port
, pdc
->dma_addr
+ xmit
->tail
);
591 UART_PUT_TCR(port
, count
);
592 /* re-enable PDC transmit and interrupts */
593 UART_PUT_PTCR(port
, ATMEL_PDC_TXTEN
);
594 UART_PUT_IER(port
, ATMEL_US_ENDTX
| ATMEL_US_TXBUFE
);
597 if (uart_circ_chars_pending(xmit
) < WAKEUP_CHARS
)
598 uart_write_wakeup(port
);
601 static void atmel_rx_from_ring(struct uart_port
*port
)
603 struct atmel_uart_port
*atmel_port
= to_atmel_uart_port(port
);
604 struct circ_buf
*ring
= &atmel_port
->rx_ring
;
608 while (ring
->head
!= ring
->tail
) {
609 struct atmel_uart_char c
;
611 /* Make sure c is loaded after head. */
614 c
= ((struct atmel_uart_char
*)ring
->buf
)[ring
->tail
];
616 ring
->tail
= (ring
->tail
+ 1) & (ATMEL_SERIAL_RINGSIZE
- 1);
623 * note that the error handling code is
624 * out of the main execution path
626 if (unlikely(status
& (ATMEL_US_PARE
| ATMEL_US_FRAME
627 | ATMEL_US_OVRE
| ATMEL_US_RXBRK
))) {
628 if (status
& ATMEL_US_RXBRK
) {
629 /* ignore side-effect */
630 status
&= ~(ATMEL_US_PARE
| ATMEL_US_FRAME
);
633 if (uart_handle_break(port
))
636 if (status
& ATMEL_US_PARE
)
637 port
->icount
.parity
++;
638 if (status
& ATMEL_US_FRAME
)
639 port
->icount
.frame
++;
640 if (status
& ATMEL_US_OVRE
)
641 port
->icount
.overrun
++;
643 status
&= port
->read_status_mask
;
645 if (status
& ATMEL_US_RXBRK
)
647 else if (status
& ATMEL_US_PARE
)
649 else if (status
& ATMEL_US_FRAME
)
654 if (uart_handle_sysrq_char(port
, c
.ch
))
657 uart_insert_char(port
, status
, ATMEL_US_OVRE
, c
.ch
, flg
);
661 * Drop the lock here since it might end up calling
662 * uart_start(), which takes the lock.
664 spin_unlock(&port
->lock
);
665 tty_flip_buffer_push(port
->info
->tty
);
666 spin_lock(&port
->lock
);
669 static void atmel_rx_from_dma(struct uart_port
*port
)
671 struct atmel_uart_port
*atmel_port
= to_atmel_uart_port(port
);
672 struct tty_struct
*tty
= port
->info
->tty
;
673 struct atmel_dma_buffer
*pdc
;
674 int rx_idx
= atmel_port
->pdc_rx_idx
;
680 /* Reset the UART timeout early so that we don't miss one */
681 UART_PUT_CR(port
, ATMEL_US_STTTO
);
683 pdc
= &atmel_port
->pdc_rx
[rx_idx
];
684 head
= UART_GET_RPR(port
) - pdc
->dma_addr
;
687 /* If the PDC has switched buffers, RPR won't contain
688 * any address within the current buffer. Since head
689 * is unsigned, we just need a one-way comparison to
692 * In this case, we just need to consume the entire
693 * buffer and resubmit it for DMA. This will clear the
694 * ENDRX bit as well, so that we can safely re-enable
695 * all interrupts below.
697 head
= min(head
, pdc
->dma_size
);
699 if (likely(head
!= tail
)) {
700 dma_sync_single_for_cpu(port
->dev
, pdc
->dma_addr
,
701 pdc
->dma_size
, DMA_FROM_DEVICE
);
704 * head will only wrap around when we recycle
705 * the DMA buffer, and when that happens, we
706 * explicitly set tail to 0. So head will
707 * always be greater than tail.
711 tty_insert_flip_string(tty
, pdc
->buf
+ pdc
->ofs
, count
);
713 dma_sync_single_for_device(port
->dev
, pdc
->dma_addr
,
714 pdc
->dma_size
, DMA_FROM_DEVICE
);
716 port
->icount
.rx
+= count
;
721 * If the current buffer is full, we need to check if
722 * the next one contains any additional data.
724 if (head
>= pdc
->dma_size
) {
726 UART_PUT_RNPR(port
, pdc
->dma_addr
);
727 UART_PUT_RNCR(port
, pdc
->dma_size
);
730 atmel_port
->pdc_rx_idx
= rx_idx
;
732 } while (head
>= pdc
->dma_size
);
735 * Drop the lock here since it might end up calling
736 * uart_start(), which takes the lock.
738 spin_unlock(&port
->lock
);
739 tty_flip_buffer_push(tty
);
740 spin_lock(&port
->lock
);
742 UART_PUT_IER(port
, ATMEL_US_ENDRX
| ATMEL_US_TIMEOUT
);
746 * tasklet handling tty stuff outside the interrupt handler.
748 static void atmel_tasklet_func(unsigned long data
)
750 struct uart_port
*port
= (struct uart_port
*)data
;
751 struct atmel_uart_port
*atmel_port
= to_atmel_uart_port(port
);
753 unsigned int status_change
;
755 /* The interrupt handler does not take the lock */
756 spin_lock(&port
->lock
);
758 if (atmel_use_dma_tx(port
))
761 atmel_tx_chars(port
);
763 status
= atmel_port
->irq_status
;
764 status_change
= status
^ atmel_port
->irq_status_prev
;
766 if (status_change
& (ATMEL_US_RI
| ATMEL_US_DSR
767 | ATMEL_US_DCD
| ATMEL_US_CTS
)) {
768 /* TODO: All reads to CSR will clear these interrupts! */
769 if (status_change
& ATMEL_US_RI
)
771 if (status_change
& ATMEL_US_DSR
)
773 if (status_change
& ATMEL_US_DCD
)
774 uart_handle_dcd_change(port
, !(status
& ATMEL_US_DCD
));
775 if (status_change
& ATMEL_US_CTS
)
776 uart_handle_cts_change(port
, !(status
& ATMEL_US_CTS
));
778 wake_up_interruptible(&port
->info
->delta_msr_wait
);
780 atmel_port
->irq_status_prev
= status
;
783 if (atmel_use_dma_rx(port
))
784 atmel_rx_from_dma(port
);
786 atmel_rx_from_ring(port
);
788 spin_unlock(&port
->lock
);
792 * Perform initialization and enable port for reception
794 static int atmel_startup(struct uart_port
*port
)
796 struct atmel_uart_port
*atmel_port
= to_atmel_uart_port(port
);
797 struct tty_struct
*tty
= port
->info
->tty
;
801 * Ensure that no interrupts are enabled otherwise when
802 * request_irq() is called we could get stuck trying to
803 * handle an unexpected interrupt
805 UART_PUT_IDR(port
, -1);
810 retval
= request_irq(port
->irq
, atmel_interrupt
, IRQF_SHARED
,
811 tty
? tty
->name
: "atmel_serial", port
);
813 printk("atmel_serial: atmel_startup - Can't get irq\n");
818 * Initialize DMA (if necessary)
820 if (atmel_use_dma_rx(port
)) {
823 for (i
= 0; i
< 2; i
++) {
824 struct atmel_dma_buffer
*pdc
= &atmel_port
->pdc_rx
[i
];
826 pdc
->buf
= kmalloc(PDC_BUFFER_SIZE
, GFP_KERNEL
);
827 if (pdc
->buf
== NULL
) {
829 dma_unmap_single(port
->dev
,
830 atmel_port
->pdc_rx
[0].dma_addr
,
833 kfree(atmel_port
->pdc_rx
[0].buf
);
835 free_irq(port
->irq
, port
);
838 pdc
->dma_addr
= dma_map_single(port
->dev
,
842 pdc
->dma_size
= PDC_BUFFER_SIZE
;
846 atmel_port
->pdc_rx_idx
= 0;
848 UART_PUT_RPR(port
, atmel_port
->pdc_rx
[0].dma_addr
);
849 UART_PUT_RCR(port
, PDC_BUFFER_SIZE
);
851 UART_PUT_RNPR(port
, atmel_port
->pdc_rx
[1].dma_addr
);
852 UART_PUT_RNCR(port
, PDC_BUFFER_SIZE
);
854 if (atmel_use_dma_tx(port
)) {
855 struct atmel_dma_buffer
*pdc
= &atmel_port
->pdc_tx
;
856 struct circ_buf
*xmit
= &port
->info
->xmit
;
858 pdc
->buf
= xmit
->buf
;
859 pdc
->dma_addr
= dma_map_single(port
->dev
,
863 pdc
->dma_size
= UART_XMIT_SIZE
;
868 * If there is a specific "open" function (to register
869 * control line interrupts)
871 if (atmel_open_hook
) {
872 retval
= atmel_open_hook(port
);
874 free_irq(port
->irq
, port
);
880 * Finally, enable the serial port
882 UART_PUT_CR(port
, ATMEL_US_RSTSTA
| ATMEL_US_RSTRX
);
883 /* enable xmit & rcvr */
884 UART_PUT_CR(port
, ATMEL_US_TXEN
| ATMEL_US_RXEN
);
886 if (atmel_use_dma_rx(port
)) {
887 /* set UART timeout */
888 UART_PUT_RTOR(port
, PDC_RX_TIMEOUT
);
889 UART_PUT_CR(port
, ATMEL_US_STTTO
);
891 UART_PUT_IER(port
, ATMEL_US_ENDRX
| ATMEL_US_TIMEOUT
);
892 /* enable PDC controller */
893 UART_PUT_PTCR(port
, ATMEL_PDC_RXTEN
);
895 /* enable receive only */
896 UART_PUT_IER(port
, ATMEL_US_RXRDY
);
905 static void atmel_shutdown(struct uart_port
*port
)
907 struct atmel_uart_port
*atmel_port
= to_atmel_uart_port(port
);
909 * Ensure everything is stopped.
917 if (atmel_use_dma_rx(port
)) {
920 for (i
= 0; i
< 2; i
++) {
921 struct atmel_dma_buffer
*pdc
= &atmel_port
->pdc_rx
[i
];
923 dma_unmap_single(port
->dev
,
930 if (atmel_use_dma_tx(port
)) {
931 struct atmel_dma_buffer
*pdc
= &atmel_port
->pdc_tx
;
933 dma_unmap_single(port
->dev
,
940 * Disable all interrupts, port and break condition.
942 UART_PUT_CR(port
, ATMEL_US_RSTSTA
);
943 UART_PUT_IDR(port
, -1);
948 free_irq(port
->irq
, port
);
951 * If there is a specific "close" function (to unregister
952 * control line interrupts)
954 if (atmel_close_hook
)
955 atmel_close_hook(port
);
959 * Power / Clock management.
961 static void atmel_serial_pm(struct uart_port
*port
, unsigned int state
,
962 unsigned int oldstate
)
964 struct atmel_uart_port
*atmel_port
= to_atmel_uart_port(port
);
969 * Enable the peripheral clock for this serial port.
970 * This is called on uart_open() or a resume event.
972 clk_enable(atmel_port
->clk
);
976 * Disable the peripheral clock for this serial port.
977 * This is called on uart_close() or a suspend event.
979 clk_disable(atmel_port
->clk
);
982 printk(KERN_ERR
"atmel_serial: unknown pm %d\n", state
);
987 * Change the port parameters
989 static void atmel_set_termios(struct uart_port
*port
, struct ktermios
*termios
,
990 struct ktermios
*old
)
993 unsigned int mode
, imr
, quot
, baud
;
995 /* Get current mode register */
996 mode
= UART_GET_MR(port
) & ~(ATMEL_US_USCLKS
| ATMEL_US_CHRL
997 | ATMEL_US_NBSTOP
| ATMEL_US_PAR
);
999 baud
= uart_get_baud_rate(port
, termios
, old
, 0, port
->uartclk
/ 16);
1000 quot
= uart_get_divisor(port
, baud
);
1002 if (quot
> 65535) { /* BRGR is 16-bit, so switch to slower clock */
1004 mode
|= ATMEL_US_USCLKS_MCK_DIV8
;
1008 switch (termios
->c_cflag
& CSIZE
) {
1010 mode
|= ATMEL_US_CHRL_5
;
1013 mode
|= ATMEL_US_CHRL_6
;
1016 mode
|= ATMEL_US_CHRL_7
;
1019 mode
|= ATMEL_US_CHRL_8
;
1024 if (termios
->c_cflag
& CSTOPB
)
1025 mode
|= ATMEL_US_NBSTOP_2
;
1028 if (termios
->c_cflag
& PARENB
) {
1029 /* Mark or Space parity */
1030 if (termios
->c_cflag
& CMSPAR
) {
1031 if (termios
->c_cflag
& PARODD
)
1032 mode
|= ATMEL_US_PAR_MARK
;
1034 mode
|= ATMEL_US_PAR_SPACE
;
1035 } else if (termios
->c_cflag
& PARODD
)
1036 mode
|= ATMEL_US_PAR_ODD
;
1038 mode
|= ATMEL_US_PAR_EVEN
;
1040 mode
|= ATMEL_US_PAR_NONE
;
1042 spin_lock_irqsave(&port
->lock
, flags
);
1044 port
->read_status_mask
= ATMEL_US_OVRE
;
1045 if (termios
->c_iflag
& INPCK
)
1046 port
->read_status_mask
|= (ATMEL_US_FRAME
| ATMEL_US_PARE
);
1047 if (termios
->c_iflag
& (BRKINT
| PARMRK
))
1048 port
->read_status_mask
|= ATMEL_US_RXBRK
;
1050 if (atmel_use_dma_rx(port
))
1051 /* need to enable error interrupts */
1052 UART_PUT_IER(port
, port
->read_status_mask
);
1055 * Characters to ignore
1057 port
->ignore_status_mask
= 0;
1058 if (termios
->c_iflag
& IGNPAR
)
1059 port
->ignore_status_mask
|= (ATMEL_US_FRAME
| ATMEL_US_PARE
);
1060 if (termios
->c_iflag
& IGNBRK
) {
1061 port
->ignore_status_mask
|= ATMEL_US_RXBRK
;
1063 * If we're ignoring parity and break indicators,
1064 * ignore overruns too (for real raw support).
1066 if (termios
->c_iflag
& IGNPAR
)
1067 port
->ignore_status_mask
|= ATMEL_US_OVRE
;
1069 /* TODO: Ignore all characters if CREAD is set.*/
1071 /* update the per-port timeout */
1072 uart_update_timeout(port
, termios
->c_cflag
, baud
);
1074 /* save/disable interrupts and drain transmitter */
1075 imr
= UART_GET_IMR(port
);
1076 UART_PUT_IDR(port
, -1);
1077 while (!(UART_GET_CSR(port
) & ATMEL_US_TXEMPTY
))
1080 /* disable receiver and transmitter */
1081 UART_PUT_CR(port
, ATMEL_US_TXDIS
| ATMEL_US_RXDIS
);
1083 /* set the parity, stop bits and data size */
1084 UART_PUT_MR(port
, mode
);
1086 /* set the baud rate */
1087 UART_PUT_BRGR(port
, quot
);
1088 UART_PUT_CR(port
, ATMEL_US_RSTSTA
| ATMEL_US_RSTRX
);
1089 UART_PUT_CR(port
, ATMEL_US_TXEN
| ATMEL_US_RXEN
);
1091 /* restore interrupts */
1092 UART_PUT_IER(port
, imr
);
1094 /* CTS flow-control and modem-status interrupts */
1095 if (UART_ENABLE_MS(port
, termios
->c_cflag
))
1096 port
->ops
->enable_ms(port
);
1098 spin_unlock_irqrestore(&port
->lock
, flags
);
1102 * Return string describing the specified port
1104 static const char *atmel_type(struct uart_port
*port
)
1106 return (port
->type
== PORT_ATMEL
) ? "ATMEL_SERIAL" : NULL
;
1110 * Release the memory region(s) being used by 'port'.
1112 static void atmel_release_port(struct uart_port
*port
)
1114 struct platform_device
*pdev
= to_platform_device(port
->dev
);
1115 int size
= pdev
->resource
[0].end
- pdev
->resource
[0].start
+ 1;
1117 release_mem_region(port
->mapbase
, size
);
1119 if (port
->flags
& UPF_IOREMAP
) {
1120 iounmap(port
->membase
);
1121 port
->membase
= NULL
;
1126 * Request the memory region(s) being used by 'port'.
1128 static int atmel_request_port(struct uart_port
*port
)
1130 struct platform_device
*pdev
= to_platform_device(port
->dev
);
1131 int size
= pdev
->resource
[0].end
- pdev
->resource
[0].start
+ 1;
1133 if (!request_mem_region(port
->mapbase
, size
, "atmel_serial"))
1136 if (port
->flags
& UPF_IOREMAP
) {
1137 port
->membase
= ioremap(port
->mapbase
, size
);
1138 if (port
->membase
== NULL
) {
1139 release_mem_region(port
->mapbase
, size
);
1148 * Configure/autoconfigure the port.
1150 static void atmel_config_port(struct uart_port
*port
, int flags
)
1152 if (flags
& UART_CONFIG_TYPE
) {
1153 port
->type
= PORT_ATMEL
;
1154 atmel_request_port(port
);
1159 * Verify the new serial_struct (for TIOCSSERIAL).
1161 static int atmel_verify_port(struct uart_port
*port
, struct serial_struct
*ser
)
1164 if (ser
->type
!= PORT_UNKNOWN
&& ser
->type
!= PORT_ATMEL
)
1166 if (port
->irq
!= ser
->irq
)
1168 if (ser
->io_type
!= SERIAL_IO_MEM
)
1170 if (port
->uartclk
/ 16 != ser
->baud_base
)
1172 if ((void *)port
->mapbase
!= ser
->iomem_base
)
1174 if (port
->iobase
!= ser
->port
)
1181 static struct uart_ops atmel_pops
= {
1182 .tx_empty
= atmel_tx_empty
,
1183 .set_mctrl
= atmel_set_mctrl
,
1184 .get_mctrl
= atmel_get_mctrl
,
1185 .stop_tx
= atmel_stop_tx
,
1186 .start_tx
= atmel_start_tx
,
1187 .stop_rx
= atmel_stop_rx
,
1188 .enable_ms
= atmel_enable_ms
,
1189 .break_ctl
= atmel_break_ctl
,
1190 .startup
= atmel_startup
,
1191 .shutdown
= atmel_shutdown
,
1192 .set_termios
= atmel_set_termios
,
1194 .release_port
= atmel_release_port
,
1195 .request_port
= atmel_request_port
,
1196 .config_port
= atmel_config_port
,
1197 .verify_port
= atmel_verify_port
,
1198 .pm
= atmel_serial_pm
,
1202 * Configure the port from the platform device resource info.
1204 static void __devinit
atmel_init_port(struct atmel_uart_port
*atmel_port
,
1205 struct platform_device
*pdev
)
1207 struct uart_port
*port
= &atmel_port
->uart
;
1208 struct atmel_uart_data
*data
= pdev
->dev
.platform_data
;
1210 port
->iotype
= UPIO_MEM
;
1211 port
->flags
= UPF_BOOT_AUTOCONF
;
1212 port
->ops
= &atmel_pops
;
1214 port
->line
= pdev
->id
;
1215 port
->dev
= &pdev
->dev
;
1217 port
->mapbase
= pdev
->resource
[0].start
;
1218 port
->irq
= pdev
->resource
[1].start
;
1220 tasklet_init(&atmel_port
->tasklet
, atmel_tasklet_func
,
1221 (unsigned long)port
);
1223 memset(&atmel_port
->rx_ring
, 0, sizeof(atmel_port
->rx_ring
));
1226 /* Already mapped by setup code */
1227 port
->membase
= data
->regs
;
1229 port
->flags
|= UPF_IOREMAP
;
1230 port
->membase
= NULL
;
1233 /* for console, the clock could already be configured */
1234 if (!atmel_port
->clk
) {
1235 atmel_port
->clk
= clk_get(&pdev
->dev
, "usart");
1236 clk_enable(atmel_port
->clk
);
1237 port
->uartclk
= clk_get_rate(atmel_port
->clk
);
1240 atmel_port
->use_dma_rx
= data
->use_dma_rx
;
1241 atmel_port
->use_dma_tx
= data
->use_dma_tx
;
1242 if (atmel_use_dma_tx(port
))
1243 port
->fifosize
= PDC_BUFFER_SIZE
;
1247 * Register board-specific modem-control line handlers.
1249 void __init
atmel_register_uart_fns(struct atmel_port_fns
*fns
)
1252 atmel_pops
.enable_ms
= fns
->enable_ms
;
1254 atmel_pops
.get_mctrl
= fns
->get_mctrl
;
1256 atmel_pops
.set_mctrl
= fns
->set_mctrl
;
1257 atmel_open_hook
= fns
->open
;
1258 atmel_close_hook
= fns
->close
;
1259 atmel_pops
.pm
= fns
->pm
;
1260 atmel_pops
.set_wake
= fns
->set_wake
;
1263 #ifdef CONFIG_SERIAL_ATMEL_CONSOLE
1264 static void atmel_console_putchar(struct uart_port
*port
, int ch
)
1266 while (!(UART_GET_CSR(port
) & ATMEL_US_TXRDY
))
1268 UART_PUT_CHAR(port
, ch
);
1272 * Interrupts are disabled on entering
1274 static void atmel_console_write(struct console
*co
, const char *s
, u_int count
)
1276 struct uart_port
*port
= &atmel_ports
[co
->index
].uart
;
1277 unsigned int status
, imr
;
1278 unsigned int pdc_tx
;
1281 * First, save IMR and then disable interrupts
1283 imr
= UART_GET_IMR(port
);
1284 UART_PUT_IDR(port
, ATMEL_US_RXRDY
| ATMEL_US_TXRDY
);
1286 /* Store PDC transmit status and disable it */
1287 pdc_tx
= UART_GET_PTSR(port
) & ATMEL_PDC_TXTEN
;
1288 UART_PUT_PTCR(port
, ATMEL_PDC_TXTDIS
);
1290 uart_console_write(port
, s
, count
, atmel_console_putchar
);
1293 * Finally, wait for transmitter to become empty
1297 status
= UART_GET_CSR(port
);
1298 } while (!(status
& ATMEL_US_TXRDY
));
1300 /* Restore PDC transmit status */
1302 UART_PUT_PTCR(port
, ATMEL_PDC_TXTEN
);
1304 /* set interrupts back the way they were */
1305 UART_PUT_IER(port
, imr
);
1309 * If the port was already initialised (eg, by a boot loader),
1310 * try to determine the current setup.
1312 static void __init
atmel_console_get_options(struct uart_port
*port
, int *baud
,
1313 int *parity
, int *bits
)
1315 unsigned int mr
, quot
;
1318 * If the baud rate generator isn't running, the port wasn't
1319 * initialized by the boot loader.
1321 quot
= UART_GET_BRGR(port
) & ATMEL_US_CD
;
1325 mr
= UART_GET_MR(port
) & ATMEL_US_CHRL
;
1326 if (mr
== ATMEL_US_CHRL_8
)
1331 mr
= UART_GET_MR(port
) & ATMEL_US_PAR
;
1332 if (mr
== ATMEL_US_PAR_EVEN
)
1334 else if (mr
== ATMEL_US_PAR_ODD
)
1338 * The serial core only rounds down when matching this to a
1339 * supported baud rate. Make sure we don't end up slightly
1340 * lower than one of those, as it would make us fall through
1341 * to a much lower baud rate than we really want.
1343 *baud
= port
->uartclk
/ (16 * (quot
- 1));
1346 static int __init
atmel_console_setup(struct console
*co
, char *options
)
1348 struct uart_port
*port
= &atmel_ports
[co
->index
].uart
;
1354 if (port
->membase
== NULL
) {
1355 /* Port not initialized yet - delay setup */
1359 UART_PUT_IDR(port
, -1);
1360 UART_PUT_CR(port
, ATMEL_US_RSTSTA
| ATMEL_US_RSTRX
);
1361 UART_PUT_CR(port
, ATMEL_US_TXEN
| ATMEL_US_RXEN
);
1364 uart_parse_options(options
, &baud
, &parity
, &bits
, &flow
);
1366 atmel_console_get_options(port
, &baud
, &parity
, &bits
);
1368 return uart_set_options(port
, co
, baud
, parity
, bits
, flow
);
1371 static struct uart_driver atmel_uart
;
1373 static struct console atmel_console
= {
1374 .name
= ATMEL_DEVICENAME
,
1375 .write
= atmel_console_write
,
1376 .device
= uart_console_device
,
1377 .setup
= atmel_console_setup
,
1378 .flags
= CON_PRINTBUFFER
,
1380 .data
= &atmel_uart
,
1383 #define ATMEL_CONSOLE_DEVICE &atmel_console
1386 * Early console initialization (before VM subsystem initialized).
1388 static int __init
atmel_console_init(void)
1390 if (atmel_default_console_device
) {
1391 add_preferred_console(ATMEL_DEVICENAME
,
1392 atmel_default_console_device
->id
, NULL
);
1393 atmel_init_port(&atmel_ports
[atmel_default_console_device
->id
],
1394 atmel_default_console_device
);
1395 register_console(&atmel_console
);
1401 console_initcall(atmel_console_init
);
1404 * Late console initialization.
1406 static int __init
atmel_late_console_init(void)
1408 if (atmel_default_console_device
1409 && !(atmel_console
.flags
& CON_ENABLED
))
1410 register_console(&atmel_console
);
1415 core_initcall(atmel_late_console_init
);
1417 static inline bool atmel_is_console_port(struct uart_port
*port
)
1419 return port
->cons
&& port
->cons
->index
== port
->line
;
1423 #define ATMEL_CONSOLE_DEVICE NULL
1425 static inline bool atmel_is_console_port(struct uart_port
*port
)
1431 static struct uart_driver atmel_uart
= {
1432 .owner
= THIS_MODULE
,
1433 .driver_name
= "atmel_serial",
1434 .dev_name
= ATMEL_DEVICENAME
,
1435 .major
= SERIAL_ATMEL_MAJOR
,
1436 .minor
= MINOR_START
,
1437 .nr
= ATMEL_MAX_UART
,
1438 .cons
= ATMEL_CONSOLE_DEVICE
,
1442 static bool atmel_serial_clk_will_stop(void)
1444 #ifdef CONFIG_ARCH_AT91
1445 return at91_suspend_entering_slow_clock();
1451 static int atmel_serial_suspend(struct platform_device
*pdev
,
1454 struct uart_port
*port
= platform_get_drvdata(pdev
);
1455 struct atmel_uart_port
*atmel_port
= to_atmel_uart_port(port
);
1457 if (atmel_is_console_port(port
) && console_suspend_enabled
) {
1458 /* Drain the TX shifter */
1459 while (!(UART_GET_CSR(port
) & ATMEL_US_TXEMPTY
))
1463 if (device_may_wakeup(&pdev
->dev
)
1464 && !atmel_serial_clk_will_stop())
1465 enable_irq_wake(port
->irq
);
1467 uart_suspend_port(&atmel_uart
, port
);
1468 atmel_port
->suspended
= 1;
1474 static int atmel_serial_resume(struct platform_device
*pdev
)
1476 struct uart_port
*port
= platform_get_drvdata(pdev
);
1477 struct atmel_uart_port
*atmel_port
= to_atmel_uart_port(port
);
1479 if (atmel_port
->suspended
) {
1480 uart_resume_port(&atmel_uart
, port
);
1481 atmel_port
->suspended
= 0;
1483 disable_irq_wake(port
->irq
);
1488 #define atmel_serial_suspend NULL
1489 #define atmel_serial_resume NULL
1492 static int __devinit
atmel_serial_probe(struct platform_device
*pdev
)
1494 struct atmel_uart_port
*port
;
1498 BUILD_BUG_ON(!is_power_of_2(ATMEL_SERIAL_RINGSIZE
));
1500 port
= &atmel_ports
[pdev
->id
];
1501 atmel_init_port(port
, pdev
);
1503 if (!atmel_use_dma_rx(&port
->uart
)) {
1505 data
= kmalloc(sizeof(struct atmel_uart_char
)
1506 * ATMEL_SERIAL_RINGSIZE
, GFP_KERNEL
);
1508 goto err_alloc_ring
;
1509 port
->rx_ring
.buf
= data
;
1512 ret
= uart_add_one_port(&atmel_uart
, &port
->uart
);
1516 device_init_wakeup(&pdev
->dev
, 1);
1517 platform_set_drvdata(pdev
, port
);
1522 kfree(port
->rx_ring
.buf
);
1523 port
->rx_ring
.buf
= NULL
;
1525 if (!atmel_is_console_port(&port
->uart
)) {
1526 clk_disable(port
->clk
);
1534 static int __devexit
atmel_serial_remove(struct platform_device
*pdev
)
1536 struct uart_port
*port
= platform_get_drvdata(pdev
);
1537 struct atmel_uart_port
*atmel_port
= to_atmel_uart_port(port
);
1540 device_init_wakeup(&pdev
->dev
, 0);
1541 platform_set_drvdata(pdev
, NULL
);
1543 ret
= uart_remove_one_port(&atmel_uart
, port
);
1545 tasklet_kill(&atmel_port
->tasklet
);
1546 kfree(atmel_port
->rx_ring
.buf
);
1548 /* "port" is allocated statically, so we shouldn't free it */
1550 clk_disable(atmel_port
->clk
);
1551 clk_put(atmel_port
->clk
);
1556 static struct platform_driver atmel_serial_driver
= {
1557 .probe
= atmel_serial_probe
,
1558 .remove
= __devexit_p(atmel_serial_remove
),
1559 .suspend
= atmel_serial_suspend
,
1560 .resume
= atmel_serial_resume
,
1562 .name
= "atmel_usart",
1563 .owner
= THIS_MODULE
,
1567 static int __init
atmel_serial_init(void)
1571 ret
= uart_register_driver(&atmel_uart
);
1575 ret
= platform_driver_register(&atmel_serial_driver
);
1577 uart_unregister_driver(&atmel_uart
);
1582 static void __exit
atmel_serial_exit(void)
1584 platform_driver_unregister(&atmel_serial_driver
);
1585 uart_unregister_driver(&atmel_uart
);
1588 module_init(atmel_serial_init
);
1589 module_exit(atmel_serial_exit
);
1591 MODULE_AUTHOR("Rick Bronson");
1592 MODULE_DESCRIPTION("Atmel AT91 / AT32 serial port driver");
1593 MODULE_LICENSE("GPL");
1594 MODULE_ALIAS("platform:atmel_usart");