2 * Blackfin On-Chip Serial Driver
4 * Copyright 2006-2010 Analog Devices Inc.
6 * Enter bugs at http://blackfin.uclinux.org/
8 * Licensed under the GPL-2 or later.
11 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
15 #define DRIVER_NAME "bfin-uart"
16 #define pr_fmt(fmt) DRIVER_NAME ": " fmt
18 #include <linux/module.h>
19 #include <linux/ioport.h>
20 #include <linux/gfp.h>
22 #include <linux/init.h>
23 #include <linux/console.h>
24 #include <linux/sysrq.h>
25 #include <linux/platform_device.h>
26 #include <linux/tty.h>
27 #include <linux/tty_flip.h>
28 #include <linux/serial_core.h>
29 #include <linux/gpio.h>
30 #include <linux/irq.h>
31 #include <linux/kgdb.h>
32 #include <linux/slab.h>
33 #include <linux/dma-mapping.h>
35 #include <asm/portmux.h>
36 #include <asm/cacheflush.h>
39 #define port_membase(uart) (((struct bfin_serial_port *)(uart))->port.membase)
40 #define get_lsr_cache(uart) (((struct bfin_serial_port *)(uart))->lsr)
41 #define put_lsr_cache(uart, v) (((struct bfin_serial_port *)(uart))->lsr = (v))
42 #include <asm/bfin_serial.h>
44 #ifdef CONFIG_SERIAL_BFIN_MODULE
45 # undef CONFIG_EARLY_PRINTK
48 #ifdef CONFIG_SERIAL_BFIN_MODULE
49 # undef CONFIG_EARLY_PRINTK
52 /* UART name and device definitions */
53 #define BFIN_SERIAL_DEV_NAME "ttyBF"
54 #define BFIN_SERIAL_MAJOR 204
55 #define BFIN_SERIAL_MINOR 64
57 static struct bfin_serial_port
*bfin_serial_ports
[BFIN_UART_NR_PORTS
];
59 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
60 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
62 # ifndef CONFIG_SERIAL_BFIN_PIO
63 # error KGDB only support UART in PIO mode.
66 static int kgdboc_port_line
;
67 static int kgdboc_break_enabled
;
70 * Setup for console. Argument comes from the menuconfig
72 #define DMA_RX_XCOUNT 512
73 #define DMA_RX_YCOUNT (PAGE_SIZE / DMA_RX_XCOUNT)
75 #define DMA_RX_FLUSH_JIFFIES (HZ / 50)
77 #ifdef CONFIG_SERIAL_BFIN_DMA
78 static void bfin_serial_dma_tx_chars(struct bfin_serial_port
*uart
);
80 static void bfin_serial_tx_chars(struct bfin_serial_port
*uart
);
83 static void bfin_serial_reset_irda(struct uart_port
*port
);
85 #if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
86 defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
87 static unsigned int bfin_serial_get_mctrl(struct uart_port
*port
)
89 struct bfin_serial_port
*uart
= (struct bfin_serial_port
*)port
;
90 if (uart
->cts_pin
< 0)
91 return TIOCM_CTS
| TIOCM_DSR
| TIOCM_CAR
;
93 /* CTS PIN is negative assertive. */
94 if (UART_GET_CTS(uart
))
95 return TIOCM_CTS
| TIOCM_DSR
| TIOCM_CAR
;
97 return TIOCM_DSR
| TIOCM_CAR
;
100 static void bfin_serial_set_mctrl(struct uart_port
*port
, unsigned int mctrl
)
102 struct bfin_serial_port
*uart
= (struct bfin_serial_port
*)port
;
103 if (uart
->rts_pin
< 0)
106 /* RTS PIN is negative assertive. */
107 if (mctrl
& TIOCM_RTS
)
108 UART_ENABLE_RTS(uart
);
110 UART_DISABLE_RTS(uart
);
114 * Handle any change of modem status signal.
116 static irqreturn_t
bfin_serial_mctrl_cts_int(int irq
, void *dev_id
)
118 struct bfin_serial_port
*uart
= dev_id
;
121 status
= bfin_serial_get_mctrl(&uart
->port
);
122 uart_handle_cts_change(&uart
->port
, status
& TIOCM_CTS
);
123 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
125 UART_CLEAR_SCTS(uart
);
126 UART_CLEAR_IER(uart
, EDSSI
);
132 static unsigned int bfin_serial_get_mctrl(struct uart_port
*port
)
134 return TIOCM_CTS
| TIOCM_DSR
| TIOCM_CAR
;
137 static void bfin_serial_set_mctrl(struct uart_port
*port
, unsigned int mctrl
)
143 * interrupts are disabled on entry
145 static void bfin_serial_stop_tx(struct uart_port
*port
)
147 struct bfin_serial_port
*uart
= (struct bfin_serial_port
*)port
;
148 #ifdef CONFIG_SERIAL_BFIN_DMA
149 struct circ_buf
*xmit
= &uart
->port
.state
->xmit
;
152 while (!(UART_GET_LSR(uart
) & TEMT
))
155 #ifdef CONFIG_SERIAL_BFIN_DMA
156 disable_dma(uart
->tx_dma_channel
);
157 xmit
->tail
= (xmit
->tail
+ uart
->tx_count
) & (UART_XMIT_SIZE
- 1);
158 uart
->port
.icount
.tx
+= uart
->tx_count
;
164 UART_PUT_LSR(uart
, TFI
);
166 UART_CLEAR_IER(uart
, ETBEI
);
171 * port is locked and interrupts are disabled
173 static void bfin_serial_start_tx(struct uart_port
*port
)
175 struct bfin_serial_port
*uart
= (struct bfin_serial_port
*)port
;
176 struct tty_struct
*tty
= uart
->port
.state
->port
.tty
;
178 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
179 if (uart
->scts
&& !(bfin_serial_get_mctrl(&uart
->port
) & TIOCM_CTS
)) {
181 uart_handle_cts_change(&uart
->port
, uart
->scts
);
186 * To avoid losting RX interrupt, we reset IR function
187 * before sending data.
189 if (tty
->termios
->c_line
== N_IRDA
)
190 bfin_serial_reset_irda(port
);
192 #ifdef CONFIG_SERIAL_BFIN_DMA
194 bfin_serial_dma_tx_chars(uart
);
196 UART_SET_IER(uart
, ETBEI
);
197 bfin_serial_tx_chars(uart
);
202 * Interrupts are enabled
204 static void bfin_serial_stop_rx(struct uart_port
*port
)
206 struct bfin_serial_port
*uart
= (struct bfin_serial_port
*)port
;
208 UART_CLEAR_IER(uart
, ERBFI
);
212 * Set the modem control timer to fire immediately.
214 static void bfin_serial_enable_ms(struct uart_port
*port
)
219 #if ANOMALY_05000363 && defined(CONFIG_SERIAL_BFIN_PIO)
220 # define UART_GET_ANOMALY_THRESHOLD(uart) ((uart)->anomaly_threshold)
221 # define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v))
223 # define UART_GET_ANOMALY_THRESHOLD(uart) 0
224 # define UART_SET_ANOMALY_THRESHOLD(uart, v)
227 #ifdef CONFIG_SERIAL_BFIN_PIO
228 static void bfin_serial_rx_chars(struct bfin_serial_port
*uart
)
230 struct tty_struct
*tty
= NULL
;
231 unsigned int status
, ch
, flg
;
232 static struct timeval anomaly_start
= { .tv_sec
= 0 };
234 status
= UART_GET_LSR(uart
);
235 UART_CLEAR_LSR(uart
);
237 ch
= UART_GET_CHAR(uart
);
238 uart
->port
.icount
.rx
++;
240 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
241 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
242 if (kgdb_connected
&& kgdboc_port_line
== uart
->port
.line
243 && kgdboc_break_enabled
)
244 if (ch
== 0x3) {/* Ctrl + C */
249 if (!uart
->port
.state
|| !uart
->port
.state
->port
.tty
)
252 tty
= uart
->port
.state
->port
.tty
;
254 if (ANOMALY_05000363
) {
255 /* The BF533 (and BF561) family of processors have a nice anomaly
256 * where they continuously generate characters for a "single" break.
257 * We have to basically ignore this flood until the "next" valid
258 * character comes across. Due to the nature of the flood, it is
259 * not possible to reliably catch bytes that are sent too quickly
260 * after this break. So application code talking to the Blackfin
261 * which sends a break signal must allow at least 1.5 character
262 * times after the end of the break for things to stabilize. This
263 * timeout was picked as it must absolutely be larger than 1
264 * character time +/- some percent. So 1.5 sounds good. All other
265 * Blackfin families operate properly. Woo.
267 if (anomaly_start
.tv_sec
) {
271 if ((~ch
& (~ch
+ 1)) & 0xff)
272 goto known_good_char
;
274 do_gettimeofday(&curr
);
275 if (curr
.tv_sec
- anomaly_start
.tv_sec
> 1)
276 goto known_good_char
;
279 if (curr
.tv_sec
!= anomaly_start
.tv_sec
)
280 usecs
+= USEC_PER_SEC
;
281 usecs
+= curr
.tv_usec
- anomaly_start
.tv_usec
;
283 if (usecs
> UART_GET_ANOMALY_THRESHOLD(uart
))
284 goto known_good_char
;
287 anomaly_start
.tv_sec
= 0;
289 anomaly_start
= curr
;
295 anomaly_start
.tv_sec
= 0;
300 if (ANOMALY_05000363
)
301 if (bfin_revid() < 5)
302 do_gettimeofday(&anomaly_start
);
303 uart
->port
.icount
.brk
++;
304 if (uart_handle_break(&uart
->port
))
306 status
&= ~(PE
| FE
);
309 uart
->port
.icount
.parity
++;
311 uart
->port
.icount
.overrun
++;
313 uart
->port
.icount
.frame
++;
315 status
&= uart
->port
.read_status_mask
;
319 else if (status
& PE
)
321 else if (status
& FE
)
326 if (uart_handle_sysrq_char(&uart
->port
, ch
))
329 uart_insert_char(&uart
->port
, status
, OE
, ch
, flg
);
332 tty_flip_buffer_push(tty
);
335 static void bfin_serial_tx_chars(struct bfin_serial_port
*uart
)
337 struct circ_buf
*xmit
= &uart
->port
.state
->xmit
;
339 if (uart_circ_empty(xmit
) || uart_tx_stopped(&uart
->port
)) {
342 UART_PUT_LSR(uart
, TFI
);
345 * 05000215 - we always clear ETBEI within last UART TX
346 * interrupt to end a string. It is always set
347 * when start a new tx.
349 UART_CLEAR_IER(uart
, ETBEI
);
353 if (uart
->port
.x_char
) {
354 UART_PUT_CHAR(uart
, uart
->port
.x_char
);
355 uart
->port
.icount
.tx
++;
356 uart
->port
.x_char
= 0;
359 while ((UART_GET_LSR(uart
) & THRE
) && xmit
->tail
!= xmit
->head
) {
360 UART_PUT_CHAR(uart
, xmit
->buf
[xmit
->tail
]);
361 xmit
->tail
= (xmit
->tail
+ 1) & (UART_XMIT_SIZE
- 1);
362 uart
->port
.icount
.tx
++;
365 if (uart_circ_chars_pending(xmit
) < WAKEUP_CHARS
)
366 uart_write_wakeup(&uart
->port
);
369 static irqreturn_t
bfin_serial_rx_int(int irq
, void *dev_id
)
371 struct bfin_serial_port
*uart
= dev_id
;
373 while (UART_GET_LSR(uart
) & DR
)
374 bfin_serial_rx_chars(uart
);
379 static irqreturn_t
bfin_serial_tx_int(int irq
, void *dev_id
)
381 struct bfin_serial_port
*uart
= dev_id
;
383 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
384 if (uart
->scts
&& !(bfin_serial_get_mctrl(&uart
->port
) & TIOCM_CTS
)) {
386 uart_handle_cts_change(&uart
->port
, uart
->scts
);
389 spin_lock(&uart
->port
.lock
);
390 if (UART_GET_LSR(uart
) & THRE
)
391 bfin_serial_tx_chars(uart
);
392 spin_unlock(&uart
->port
.lock
);
398 #ifdef CONFIG_SERIAL_BFIN_DMA
399 static void bfin_serial_dma_tx_chars(struct bfin_serial_port
*uart
)
401 struct circ_buf
*xmit
= &uart
->port
.state
->xmit
;
405 if (uart_circ_empty(xmit
) || uart_tx_stopped(&uart
->port
)) {
411 if (uart
->port
.x_char
) {
412 UART_PUT_CHAR(uart
, uart
->port
.x_char
);
413 uart
->port
.icount
.tx
++;
414 uart
->port
.x_char
= 0;
417 uart
->tx_count
= CIRC_CNT(xmit
->head
, xmit
->tail
, UART_XMIT_SIZE
);
418 if (uart
->tx_count
> (UART_XMIT_SIZE
- xmit
->tail
))
419 uart
->tx_count
= UART_XMIT_SIZE
- xmit
->tail
;
420 blackfin_dcache_flush_range((unsigned long)(xmit
->buf
+xmit
->tail
),
421 (unsigned long)(xmit
->buf
+xmit
->tail
+uart
->tx_count
));
422 set_dma_config(uart
->tx_dma_channel
,
423 set_bfin_dma_config(DIR_READ
, DMA_FLOW_STOP
,
428 set_dma_start_addr(uart
->tx_dma_channel
, (unsigned long)(xmit
->buf
+xmit
->tail
));
429 set_dma_x_count(uart
->tx_dma_channel
, uart
->tx_count
);
430 set_dma_x_modify(uart
->tx_dma_channel
, 1);
432 enable_dma(uart
->tx_dma_channel
);
434 UART_SET_IER(uart
, ETBEI
);
437 static void bfin_serial_dma_rx_chars(struct bfin_serial_port
*uart
)
439 struct tty_struct
*tty
= uart
->port
.state
->port
.tty
;
442 status
= UART_GET_LSR(uart
);
443 UART_CLEAR_LSR(uart
);
445 uart
->port
.icount
.rx
+=
446 CIRC_CNT(uart
->rx_dma_buf
.head
, uart
->rx_dma_buf
.tail
,
450 uart
->port
.icount
.brk
++;
451 if (uart_handle_break(&uart
->port
))
452 goto dma_ignore_char
;
453 status
&= ~(PE
| FE
);
456 uart
->port
.icount
.parity
++;
458 uart
->port
.icount
.overrun
++;
460 uart
->port
.icount
.frame
++;
462 status
&= uart
->port
.read_status_mask
;
466 else if (status
& PE
)
468 else if (status
& FE
)
473 for (i
= uart
->rx_dma_buf
.tail
; ; i
++) {
474 if (i
>= UART_XMIT_SIZE
)
476 if (i
== uart
->rx_dma_buf
.head
)
478 if (!uart_handle_sysrq_char(&uart
->port
, uart
->rx_dma_buf
.buf
[i
]))
479 uart_insert_char(&uart
->port
, status
, OE
,
480 uart
->rx_dma_buf
.buf
[i
], flg
);
484 tty_flip_buffer_push(tty
);
487 void bfin_serial_rx_dma_timeout(struct bfin_serial_port
*uart
)
491 dma_disable_irq_nosync(uart
->rx_dma_channel
);
492 spin_lock_bh(&uart
->rx_lock
);
494 /* 2D DMA RX buffer ring is used. Because curr_y_count and
495 * curr_x_count can't be read as an atomic operation,
496 * curr_y_count should be read before curr_x_count. When
497 * curr_x_count is read, curr_y_count may already indicate
498 * next buffer line. But, the position calculated here is
499 * still indicate the old line. The wrong position data may
500 * be smaller than current buffer tail, which cause garbages
501 * are received if it is not prohibit.
503 uart
->rx_dma_nrows
= get_dma_curr_ycount(uart
->rx_dma_channel
);
504 x_pos
= get_dma_curr_xcount(uart
->rx_dma_channel
);
505 uart
->rx_dma_nrows
= DMA_RX_YCOUNT
- uart
->rx_dma_nrows
;
506 if (uart
->rx_dma_nrows
== DMA_RX_YCOUNT
|| x_pos
== 0)
507 uart
->rx_dma_nrows
= 0;
508 x_pos
= DMA_RX_XCOUNT
- x_pos
;
509 if (x_pos
== DMA_RX_XCOUNT
)
512 pos
= uart
->rx_dma_nrows
* DMA_RX_XCOUNT
+ x_pos
;
513 /* Ignore receiving data if new position is in the same line of
514 * current buffer tail and small.
516 if (pos
> uart
->rx_dma_buf
.tail
||
517 uart
->rx_dma_nrows
< (uart
->rx_dma_buf
.tail
/DMA_RX_XCOUNT
)) {
518 uart
->rx_dma_buf
.head
= pos
;
519 bfin_serial_dma_rx_chars(uart
);
520 uart
->rx_dma_buf
.tail
= uart
->rx_dma_buf
.head
;
523 spin_unlock_bh(&uart
->rx_lock
);
524 dma_enable_irq(uart
->rx_dma_channel
);
526 mod_timer(&(uart
->rx_dma_timer
), jiffies
+ DMA_RX_FLUSH_JIFFIES
);
529 static irqreturn_t
bfin_serial_dma_tx_int(int irq
, void *dev_id
)
531 struct bfin_serial_port
*uart
= dev_id
;
532 struct circ_buf
*xmit
= &uart
->port
.state
->xmit
;
534 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
535 if (uart
->scts
&& !(bfin_serial_get_mctrl(&uart
->port
)&TIOCM_CTS
)) {
537 uart_handle_cts_change(&uart
->port
, uart
->scts
);
541 spin_lock(&uart
->port
.lock
);
542 if (!(get_dma_curr_irqstat(uart
->tx_dma_channel
)&DMA_RUN
)) {
543 disable_dma(uart
->tx_dma_channel
);
544 clear_dma_irqstat(uart
->tx_dma_channel
);
546 * 05000215 - we always clear ETBEI within last UART TX
547 * interrupt to end a string. It is always set
548 * when start a new tx.
550 UART_CLEAR_IER(uart
, ETBEI
);
551 xmit
->tail
= (xmit
->tail
+ uart
->tx_count
) & (UART_XMIT_SIZE
- 1);
552 uart
->port
.icount
.tx
+= uart
->tx_count
;
554 if (uart_circ_chars_pending(xmit
) < WAKEUP_CHARS
)
555 uart_write_wakeup(&uart
->port
);
557 bfin_serial_dma_tx_chars(uart
);
560 spin_unlock(&uart
->port
.lock
);
564 static irqreturn_t
bfin_serial_dma_rx_int(int irq
, void *dev_id
)
566 struct bfin_serial_port
*uart
= dev_id
;
567 unsigned short irqstat
;
570 spin_lock(&uart
->rx_lock
);
571 irqstat
= get_dma_curr_irqstat(uart
->rx_dma_channel
);
572 clear_dma_irqstat(uart
->rx_dma_channel
);
574 uart
->rx_dma_nrows
= get_dma_curr_ycount(uart
->rx_dma_channel
);
575 x_pos
= get_dma_curr_xcount(uart
->rx_dma_channel
);
576 uart
->rx_dma_nrows
= DMA_RX_YCOUNT
- uart
->rx_dma_nrows
;
577 if (uart
->rx_dma_nrows
== DMA_RX_YCOUNT
|| x_pos
== 0)
578 uart
->rx_dma_nrows
= 0;
580 pos
= uart
->rx_dma_nrows
* DMA_RX_XCOUNT
;
581 if (pos
> uart
->rx_dma_buf
.tail
||
582 uart
->rx_dma_nrows
< (uart
->rx_dma_buf
.tail
/DMA_RX_XCOUNT
)) {
583 uart
->rx_dma_buf
.head
= pos
;
584 bfin_serial_dma_rx_chars(uart
);
585 uart
->rx_dma_buf
.tail
= uart
->rx_dma_buf
.head
;
588 spin_unlock(&uart
->rx_lock
);
595 * Return TIOCSER_TEMT when transmitter is not busy.
597 static unsigned int bfin_serial_tx_empty(struct uart_port
*port
)
599 struct bfin_serial_port
*uart
= (struct bfin_serial_port
*)port
;
602 lsr
= UART_GET_LSR(uart
);
609 static void bfin_serial_break_ctl(struct uart_port
*port
, int break_state
)
611 struct bfin_serial_port
*uart
= (struct bfin_serial_port
*)port
;
612 u16 lcr
= UART_GET_LCR(uart
);
617 UART_PUT_LCR(uart
, lcr
);
621 static int bfin_serial_startup(struct uart_port
*port
)
623 struct bfin_serial_port
*uart
= (struct bfin_serial_port
*)port
;
625 #ifdef CONFIG_SERIAL_BFIN_DMA
626 dma_addr_t dma_handle
;
628 if (request_dma(uart
->rx_dma_channel
, "BFIN_UART_RX") < 0) {
629 printk(KERN_NOTICE
"Unable to attach Blackfin UART RX DMA channel\n");
633 if (request_dma(uart
->tx_dma_channel
, "BFIN_UART_TX") < 0) {
634 printk(KERN_NOTICE
"Unable to attach Blackfin UART TX DMA channel\n");
635 free_dma(uart
->rx_dma_channel
);
639 set_dma_callback(uart
->rx_dma_channel
, bfin_serial_dma_rx_int
, uart
);
640 set_dma_callback(uart
->tx_dma_channel
, bfin_serial_dma_tx_int
, uart
);
642 uart
->rx_dma_buf
.buf
= (unsigned char *)dma_alloc_coherent(NULL
, PAGE_SIZE
, &dma_handle
, GFP_DMA
);
643 uart
->rx_dma_buf
.head
= 0;
644 uart
->rx_dma_buf
.tail
= 0;
645 uart
->rx_dma_nrows
= 0;
647 set_dma_config(uart
->rx_dma_channel
,
648 set_bfin_dma_config(DIR_WRITE
, DMA_FLOW_AUTO
,
649 INTR_ON_ROW
, DIMENSION_2D
,
652 set_dma_x_count(uart
->rx_dma_channel
, DMA_RX_XCOUNT
);
653 set_dma_x_modify(uart
->rx_dma_channel
, 1);
654 set_dma_y_count(uart
->rx_dma_channel
, DMA_RX_YCOUNT
);
655 set_dma_y_modify(uart
->rx_dma_channel
, 1);
656 set_dma_start_addr(uart
->rx_dma_channel
, (unsigned long)uart
->rx_dma_buf
.buf
);
657 enable_dma(uart
->rx_dma_channel
);
659 uart
->rx_dma_timer
.data
= (unsigned long)(uart
);
660 uart
->rx_dma_timer
.function
= (void *)bfin_serial_rx_dma_timeout
;
661 uart
->rx_dma_timer
.expires
= jiffies
+ DMA_RX_FLUSH_JIFFIES
;
662 add_timer(&(uart
->rx_dma_timer
));
664 # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
665 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
666 if (kgdboc_port_line
== uart
->port
.line
&& kgdboc_break_enabled
)
667 kgdboc_break_enabled
= 0;
670 if (request_irq(uart
->rx_irq
, bfin_serial_rx_int
, IRQF_DISABLED
,
671 "BFIN_UART_RX", uart
)) {
672 printk(KERN_NOTICE
"Unable to attach BlackFin UART RX interrupt\n");
677 (uart
->tx_irq
, bfin_serial_tx_int
, IRQF_DISABLED
,
678 "BFIN_UART_TX", uart
)) {
679 printk(KERN_NOTICE
"Unable to attach BlackFin UART TX interrupt\n");
680 free_irq(uart
->rx_irq
, uart
);
687 * UART2 and UART3 on BF548 share interrupt PINs and DMA
688 * controllers with SPORT2 and SPORT3. UART rx and tx
689 * interrupts are generated in PIO mode only when configure
690 * their peripheral mapping registers properly, which means
691 * request corresponding DMA channels in PIO mode as well.
693 unsigned uart_dma_ch_rx
, uart_dma_ch_tx
;
695 switch (uart
->rx_irq
) {
697 uart_dma_ch_rx
= CH_UART3_RX
;
698 uart_dma_ch_tx
= CH_UART3_TX
;
701 uart_dma_ch_rx
= CH_UART2_RX
;
702 uart_dma_ch_tx
= CH_UART2_TX
;
705 uart_dma_ch_rx
= uart_dma_ch_tx
= 0;
709 if (uart_dma_ch_rx
&&
710 request_dma(uart_dma_ch_rx
, "BFIN_UART_RX") < 0) {
711 printk(KERN_NOTICE
"Fail to attach UART interrupt\n");
712 free_irq(uart
->rx_irq
, uart
);
713 free_irq(uart
->tx_irq
, uart
);
716 if (uart_dma_ch_tx
&&
717 request_dma(uart_dma_ch_tx
, "BFIN_UART_TX") < 0) {
718 printk(KERN_NOTICE
"Fail to attach UART interrupt\n");
719 free_dma(uart_dma_ch_rx
);
720 free_irq(uart
->rx_irq
, uart
);
721 free_irq(uart
->tx_irq
, uart
);
726 # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
727 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
732 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
733 if (uart
->cts_pin
>= 0) {
734 if (request_irq(gpio_to_irq(uart
->cts_pin
),
735 bfin_serial_mctrl_cts_int
,
736 IRQF_TRIGGER_RISING
| IRQF_TRIGGER_FALLING
|
737 IRQF_DISABLED
, "BFIN_UART_CTS", uart
)) {
739 pr_info("Unable to attach BlackFin UART CTS interrupt. So, disable it.\n");
742 if (uart
->rts_pin
>= 0)
743 gpio_direction_output(uart
->rts_pin
, 0);
745 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
746 if (uart
->cts_pin
>= 0 && request_irq(uart
->status_irq
,
747 bfin_serial_mctrl_cts_int
,
748 IRQF_DISABLED
, "BFIN_UART_MODEM_STATUS", uart
)) {
750 pr_info("Unable to attach BlackFin UART Modem Status interrupt.\n");
753 /* CTS RTS PINs are negative assertive. */
754 UART_PUT_MCR(uart
, ACTS
);
755 UART_SET_IER(uart
, EDSSI
);
758 UART_SET_IER(uart
, ERBFI
);
762 static void bfin_serial_shutdown(struct uart_port
*port
)
764 struct bfin_serial_port
*uart
= (struct bfin_serial_port
*)port
;
766 #ifdef CONFIG_SERIAL_BFIN_DMA
767 disable_dma(uart
->tx_dma_channel
);
768 free_dma(uart
->tx_dma_channel
);
769 disable_dma(uart
->rx_dma_channel
);
770 free_dma(uart
->rx_dma_channel
);
771 del_timer(&(uart
->rx_dma_timer
));
772 dma_free_coherent(NULL
, PAGE_SIZE
, uart
->rx_dma_buf
.buf
, 0);
775 switch (uart
->port
.irq
) {
777 free_dma(CH_UART3_RX
);
778 free_dma(CH_UART3_TX
);
781 free_dma(CH_UART2_RX
);
782 free_dma(CH_UART2_TX
);
788 free_irq(uart
->rx_irq
, uart
);
789 free_irq(uart
->tx_irq
, uart
);
792 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
793 if (uart
->cts_pin
>= 0)
794 free_irq(gpio_to_irq(uart
->cts_pin
), uart
);
796 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
797 if (uart
->cts_pin
>= 0)
798 free_irq(uart
->status_irq
, uart
);
803 bfin_serial_set_termios(struct uart_port
*port
, struct ktermios
*termios
,
804 struct ktermios
*old
)
806 struct bfin_serial_port
*uart
= (struct bfin_serial_port
*)port
;
808 unsigned int baud
, quot
;
809 unsigned short val
, ier
, lcr
= 0;
811 switch (termios
->c_cflag
& CSIZE
) {
825 printk(KERN_ERR
"%s: word lengh not supported\n",
830 * 05000231 - STOP bit is always set to 1 whatever the user is set.
832 if (termios
->c_cflag
& CSTOPB
) {
833 if (ANOMALY_05000231
)
834 printk(KERN_WARNING
"STOP bits other than 1 is not "
835 "supported in case of anomaly 05000231.\n");
839 if (termios
->c_cflag
& PARENB
)
841 if (!(termios
->c_cflag
& PARODD
))
843 if (termios
->c_cflag
& CMSPAR
)
846 spin_lock_irqsave(&uart
->port
.lock
, flags
);
848 port
->read_status_mask
= OE
;
849 if (termios
->c_iflag
& INPCK
)
850 port
->read_status_mask
|= (FE
| PE
);
851 if (termios
->c_iflag
& (BRKINT
| PARMRK
))
852 port
->read_status_mask
|= BI
;
855 * Characters to ignore
857 port
->ignore_status_mask
= 0;
858 if (termios
->c_iflag
& IGNPAR
)
859 port
->ignore_status_mask
|= FE
| PE
;
860 if (termios
->c_iflag
& IGNBRK
) {
861 port
->ignore_status_mask
|= BI
;
863 * If we're ignoring parity and break indicators,
864 * ignore overruns too (for real raw support).
866 if (termios
->c_iflag
& IGNPAR
)
867 port
->ignore_status_mask
|= OE
;
870 baud
= uart_get_baud_rate(port
, termios
, old
, 0, port
->uartclk
/16);
871 quot
= uart_get_divisor(port
, baud
);
873 /* If discipline is not IRDA, apply ANOMALY_05000230 */
874 if (termios
->c_line
!= N_IRDA
)
875 quot
-= ANOMALY_05000230
;
877 UART_SET_ANOMALY_THRESHOLD(uart
, USEC_PER_SEC
/ baud
* 15);
880 ier
= UART_GET_IER(uart
);
881 UART_DISABLE_INTS(uart
);
883 /* Set DLAB in LCR to Access DLL and DLH */
886 UART_PUT_DLL(uart
, quot
& 0xFF);
887 UART_PUT_DLH(uart
, (quot
>> 8) & 0xFF);
890 /* Clear DLAB in LCR to Access THR RBR IER */
891 UART_CLEAR_DLAB(uart
);
893 UART_PUT_LCR(uart
, lcr
);
896 UART_ENABLE_INTS(uart
, ier
);
898 val
= UART_GET_GCTL(uart
);
900 UART_PUT_GCTL(uart
, val
);
902 /* Port speed changed, update the per-port timeout. */
903 uart_update_timeout(port
, termios
->c_cflag
, baud
);
905 spin_unlock_irqrestore(&uart
->port
.lock
, flags
);
908 static const char *bfin_serial_type(struct uart_port
*port
)
910 struct bfin_serial_port
*uart
= (struct bfin_serial_port
*)port
;
912 return uart
->port
.type
== PORT_BFIN
? "BFIN-UART" : NULL
;
916 * Release the memory region(s) being used by 'port'.
918 static void bfin_serial_release_port(struct uart_port
*port
)
923 * Request the memory region(s) being used by 'port'.
925 static int bfin_serial_request_port(struct uart_port
*port
)
931 * Configure/autoconfigure the port.
933 static void bfin_serial_config_port(struct uart_port
*port
, int flags
)
935 struct bfin_serial_port
*uart
= (struct bfin_serial_port
*)port
;
937 if (flags
& UART_CONFIG_TYPE
&&
938 bfin_serial_request_port(&uart
->port
) == 0)
939 uart
->port
.type
= PORT_BFIN
;
943 * Verify the new serial_struct (for TIOCSSERIAL).
944 * The only change we allow are to the flags and type, and
945 * even then only between PORT_BFIN and PORT_UNKNOWN
948 bfin_serial_verify_port(struct uart_port
*port
, struct serial_struct
*ser
)
954 * Enable the IrDA function if tty->ldisc.num is N_IRDA.
955 * In other cases, disable IrDA function.
957 static void bfin_serial_set_ldisc(struct uart_port
*port
, int ld
)
959 struct bfin_serial_port
*uart
= (struct bfin_serial_port
*)port
;
964 val
= UART_GET_GCTL(uart
);
965 val
|= (IREN
| RPOLC
);
966 UART_PUT_GCTL(uart
, val
);
969 val
= UART_GET_GCTL(uart
);
970 val
&= ~(IREN
| RPOLC
);
971 UART_PUT_GCTL(uart
, val
);
975 static void bfin_serial_reset_irda(struct uart_port
*port
)
977 struct bfin_serial_port
*uart
= (struct bfin_serial_port
*)port
;
980 val
= UART_GET_GCTL(uart
);
981 val
&= ~(IREN
| RPOLC
);
982 UART_PUT_GCTL(uart
, val
);
984 val
|= (IREN
| RPOLC
);
985 UART_PUT_GCTL(uart
, val
);
989 #ifdef CONFIG_CONSOLE_POLL
991 * 05000099 - Because we only use THRE in poll_put and DR in poll_get,
992 * losing other bits of UART_LSR is not a problem here.
994 static void bfin_serial_poll_put_char(struct uart_port
*port
, unsigned char chr
)
996 struct bfin_serial_port
*uart
= (struct bfin_serial_port
*)port
;
998 while (!(UART_GET_LSR(uart
) & THRE
))
1001 UART_CLEAR_DLAB(uart
);
1002 UART_PUT_CHAR(uart
, (unsigned char)chr
);
1005 static int bfin_serial_poll_get_char(struct uart_port
*port
)
1007 struct bfin_serial_port
*uart
= (struct bfin_serial_port
*)port
;
1010 while (!(UART_GET_LSR(uart
) & DR
))
1013 UART_CLEAR_DLAB(uart
);
1014 chr
= UART_GET_CHAR(uart
);
1020 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
1021 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
1022 static void bfin_kgdboc_port_shutdown(struct uart_port
*port
)
1024 if (kgdboc_break_enabled
) {
1025 kgdboc_break_enabled
= 0;
1026 bfin_serial_shutdown(port
);
1030 static int bfin_kgdboc_port_startup(struct uart_port
*port
)
1032 kgdboc_port_line
= port
->line
;
1033 kgdboc_break_enabled
= !bfin_serial_startup(port
);
1038 static struct uart_ops bfin_serial_pops
= {
1039 .tx_empty
= bfin_serial_tx_empty
,
1040 .set_mctrl
= bfin_serial_set_mctrl
,
1041 .get_mctrl
= bfin_serial_get_mctrl
,
1042 .stop_tx
= bfin_serial_stop_tx
,
1043 .start_tx
= bfin_serial_start_tx
,
1044 .stop_rx
= bfin_serial_stop_rx
,
1045 .enable_ms
= bfin_serial_enable_ms
,
1046 .break_ctl
= bfin_serial_break_ctl
,
1047 .startup
= bfin_serial_startup
,
1048 .shutdown
= bfin_serial_shutdown
,
1049 .set_termios
= bfin_serial_set_termios
,
1050 .set_ldisc
= bfin_serial_set_ldisc
,
1051 .type
= bfin_serial_type
,
1052 .release_port
= bfin_serial_release_port
,
1053 .request_port
= bfin_serial_request_port
,
1054 .config_port
= bfin_serial_config_port
,
1055 .verify_port
= bfin_serial_verify_port
,
1056 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
1057 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
1058 .kgdboc_port_startup
= bfin_kgdboc_port_startup
,
1059 .kgdboc_port_shutdown
= bfin_kgdboc_port_shutdown
,
1061 #ifdef CONFIG_CONSOLE_POLL
1062 .poll_put_char
= bfin_serial_poll_put_char
,
1063 .poll_get_char
= bfin_serial_poll_get_char
,
1067 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
1069 * If the port was already initialised (eg, by a boot loader),
1070 * try to determine the current setup.
1073 bfin_serial_console_get_options(struct bfin_serial_port
*uart
, int *baud
,
1074 int *parity
, int *bits
)
1076 unsigned short status
;
1078 status
= UART_GET_IER(uart
) & (ERBFI
| ETBEI
);
1079 if (status
== (ERBFI
| ETBEI
)) {
1080 /* ok, the port was enabled */
1083 lcr
= UART_GET_LCR(uart
);
1092 switch (lcr
& 0x03) {
1106 /* Set DLAB in LCR to Access DLL and DLH */
1107 UART_SET_DLAB(uart
);
1109 dll
= UART_GET_DLL(uart
);
1110 dlh
= UART_GET_DLH(uart
);
1112 /* Clear DLAB in LCR to Access THR RBR IER */
1113 UART_CLEAR_DLAB(uart
);
1115 *baud
= get_sclk() / (16*(dll
| dlh
<< 8));
1117 pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__
, *baud
, *parity
, *bits
);
1120 static struct uart_driver bfin_serial_reg
;
1122 static void bfin_serial_console_putchar(struct uart_port
*port
, int ch
)
1124 struct bfin_serial_port
*uart
= (struct bfin_serial_port
*)port
;
1125 while (!(UART_GET_LSR(uart
) & THRE
))
1127 UART_PUT_CHAR(uart
, ch
);
1130 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1131 defined (CONFIG_EARLY_PRINTK) */
1133 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1134 #define CLASS_BFIN_CONSOLE "bfin-console"
1136 * Interrupts are disabled on entering
1139 bfin_serial_console_write(struct console
*co
, const char *s
, unsigned int count
)
1141 struct bfin_serial_port
*uart
= bfin_serial_ports
[co
->index
];
1142 unsigned long flags
;
1144 spin_lock_irqsave(&uart
->port
.lock
, flags
);
1145 uart_console_write(&uart
->port
, s
, count
, bfin_serial_console_putchar
);
1146 spin_unlock_irqrestore(&uart
->port
.lock
, flags
);
1151 bfin_serial_console_setup(struct console
*co
, char *options
)
1153 struct bfin_serial_port
*uart
;
1157 # if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
1158 defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
1165 * Check whether an invalid uart number has been specified, and
1166 * if so, search for the first available port that does have
1169 if (co
->index
< 0 || co
->index
>= BFIN_UART_NR_PORTS
)
1172 uart
= bfin_serial_ports
[co
->index
];
1177 uart_parse_options(options
, &baud
, &parity
, &bits
, &flow
);
1179 bfin_serial_console_get_options(uart
, &baud
, &parity
, &bits
);
1181 return uart_set_options(&uart
->port
, co
, baud
, parity
, bits
, flow
);
1184 static struct console bfin_serial_console
= {
1185 .name
= BFIN_SERIAL_DEV_NAME
,
1186 .write
= bfin_serial_console_write
,
1187 .device
= uart_console_device
,
1188 .setup
= bfin_serial_console_setup
,
1189 .flags
= CON_PRINTBUFFER
,
1191 .data
= &bfin_serial_reg
,
1193 #define BFIN_SERIAL_CONSOLE (&bfin_serial_console)
1195 #define BFIN_SERIAL_CONSOLE NULL
1196 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1198 #ifdef CONFIG_EARLY_PRINTK
1199 static struct bfin_serial_port bfin_earlyprintk_port
;
1200 #define CLASS_BFIN_EARLYPRINTK "bfin-earlyprintk"
1203 * Interrupts are disabled on entering
1206 bfin_earlyprintk_console_write(struct console
*co
, const char *s
, unsigned int count
)
1208 unsigned long flags
;
1210 if (bfin_earlyprintk_port
.port
.line
!= co
->index
)
1213 spin_lock_irqsave(&bfin_earlyprintk_port
.port
.lock
, flags
);
1214 uart_console_write(&bfin_earlyprintk_port
.port
, s
, count
,
1215 bfin_serial_console_putchar
);
1216 spin_unlock_irqrestore(&bfin_earlyprintk_port
.port
.lock
, flags
);
1220 * This should have a .setup or .early_setup in it, but then things get called
1221 * without the command line options, and the baud rate gets messed up - so
1222 * don't let the common infrastructure play with things. (see calls to setup
1223 * & earlysetup in ./kernel/printk.c:register_console()
1225 static struct __initdata console bfin_early_serial_console
= {
1226 .name
= "early_BFuart",
1227 .write
= bfin_earlyprintk_console_write
,
1228 .device
= uart_console_device
,
1229 .flags
= CON_PRINTBUFFER
,
1231 .data
= &bfin_serial_reg
,
1235 static struct uart_driver bfin_serial_reg
= {
1236 .owner
= THIS_MODULE
,
1237 .driver_name
= DRIVER_NAME
,
1238 .dev_name
= BFIN_SERIAL_DEV_NAME
,
1239 .major
= BFIN_SERIAL_MAJOR
,
1240 .minor
= BFIN_SERIAL_MINOR
,
1241 .nr
= BFIN_UART_NR_PORTS
,
1242 .cons
= BFIN_SERIAL_CONSOLE
,
1245 static int bfin_serial_suspend(struct platform_device
*pdev
, pm_message_t state
)
1247 struct bfin_serial_port
*uart
= platform_get_drvdata(pdev
);
1249 return uart_suspend_port(&bfin_serial_reg
, &uart
->port
);
1252 static int bfin_serial_resume(struct platform_device
*pdev
)
1254 struct bfin_serial_port
*uart
= platform_get_drvdata(pdev
);
1256 return uart_resume_port(&bfin_serial_reg
, &uart
->port
);
1259 static int bfin_serial_probe(struct platform_device
*pdev
)
1261 struct resource
*res
;
1262 struct bfin_serial_port
*uart
= NULL
;
1265 if (pdev
->id
< 0 || pdev
->id
>= BFIN_UART_NR_PORTS
) {
1266 dev_err(&pdev
->dev
, "Wrong bfin uart platform device id.\n");
1270 if (bfin_serial_ports
[pdev
->id
] == NULL
) {
1272 uart
= kzalloc(sizeof(*uart
), GFP_KERNEL
);
1275 "fail to malloc bfin_serial_port\n");
1278 bfin_serial_ports
[pdev
->id
] = uart
;
1280 #ifdef CONFIG_EARLY_PRINTK
1281 if (!(bfin_earlyprintk_port
.port
.membase
1282 && bfin_earlyprintk_port
.port
.line
== pdev
->id
)) {
1284 * If the peripheral PINs of current port is allocated
1285 * in earlyprintk probe stage, don't do it again.
1288 ret
= peripheral_request_list(
1289 (unsigned short *)pdev
->dev
.platform_data
, DRIVER_NAME
);
1292 "fail to request bfin serial peripherals\n");
1293 goto out_error_free_mem
;
1295 #ifdef CONFIG_EARLY_PRINTK
1299 spin_lock_init(&uart
->port
.lock
);
1300 uart
->port
.uartclk
= get_sclk();
1301 uart
->port
.fifosize
= BFIN_UART_TX_FIFO_SIZE
;
1302 uart
->port
.ops
= &bfin_serial_pops
;
1303 uart
->port
.line
= pdev
->id
;
1304 uart
->port
.iotype
= UPIO_MEM
;
1305 uart
->port
.flags
= UPF_BOOT_AUTOCONF
;
1307 res
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
1309 dev_err(&pdev
->dev
, "Cannot get IORESOURCE_MEM\n");
1311 goto out_error_free_peripherals
;
1314 uart
->port
.membase
= ioremap(res
->start
, resource_size(res
));
1315 if (!uart
->port
.membase
) {
1316 dev_err(&pdev
->dev
, "Cannot map uart IO\n");
1318 goto out_error_free_peripherals
;
1320 uart
->port
.mapbase
= res
->start
;
1322 uart
->tx_irq
= platform_get_irq(pdev
, 0);
1323 if (uart
->tx_irq
< 0) {
1324 dev_err(&pdev
->dev
, "No uart TX IRQ specified\n");
1326 goto out_error_unmap
;
1329 uart
->rx_irq
= platform_get_irq(pdev
, 1);
1330 if (uart
->rx_irq
< 0) {
1331 dev_err(&pdev
->dev
, "No uart RX IRQ specified\n");
1333 goto out_error_unmap
;
1335 uart
->port
.irq
= uart
->rx_irq
;
1337 uart
->status_irq
= platform_get_irq(pdev
, 2);
1338 if (uart
->status_irq
< 0) {
1339 dev_err(&pdev
->dev
, "No uart status IRQ specified\n");
1341 goto out_error_unmap
;
1344 #ifdef CONFIG_SERIAL_BFIN_DMA
1345 spin_lock_init(&uart
->rx_lock
);
1349 res
= platform_get_resource(pdev
, IORESOURCE_DMA
, 0);
1351 dev_err(&pdev
->dev
, "No uart TX DMA channel specified\n");
1353 goto out_error_unmap
;
1355 uart
->tx_dma_channel
= res
->start
;
1357 res
= platform_get_resource(pdev
, IORESOURCE_DMA
, 1);
1359 dev_err(&pdev
->dev
, "No uart RX DMA channel specified\n");
1361 goto out_error_unmap
;
1363 uart
->rx_dma_channel
= res
->start
;
1365 init_timer(&(uart
->rx_dma_timer
));
1368 #if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
1369 defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
1370 res
= platform_get_resource(pdev
, IORESOURCE_IO
, 0);
1374 uart
->cts_pin
= res
->start
;
1376 res
= platform_get_resource(pdev
, IORESOURCE_IO
, 1);
1380 uart
->rts_pin
= res
->start
;
1381 # if defined(CONFIG_SERIAL_BFIN_CTSRTS)
1382 if (uart
->rts_pin
>= 0)
1383 gpio_request(uart
->rts_pin
, DRIVER_NAME
);
1388 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1389 if (!is_early_platform_device(pdev
)) {
1391 uart
= bfin_serial_ports
[pdev
->id
];
1392 uart
->port
.dev
= &pdev
->dev
;
1393 dev_set_drvdata(&pdev
->dev
, uart
);
1394 ret
= uart_add_one_port(&bfin_serial_reg
, &uart
->port
);
1395 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1404 iounmap(uart
->port
.membase
);
1405 out_error_free_peripherals
:
1406 peripheral_free_list(
1407 (unsigned short *)pdev
->dev
.platform_data
);
1410 bfin_serial_ports
[pdev
->id
] = NULL
;
1416 static int __devexit
bfin_serial_remove(struct platform_device
*pdev
)
1418 struct bfin_serial_port
*uart
= platform_get_drvdata(pdev
);
1420 dev_set_drvdata(&pdev
->dev
, NULL
);
1423 uart_remove_one_port(&bfin_serial_reg
, &uart
->port
);
1424 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
1425 if (uart
->rts_pin
>= 0)
1426 gpio_free(uart
->rts_pin
);
1428 iounmap(uart
->port
.membase
);
1429 peripheral_free_list(
1430 (unsigned short *)pdev
->dev
.platform_data
);
1432 bfin_serial_ports
[pdev
->id
] = NULL
;
1438 static struct platform_driver bfin_serial_driver
= {
1439 .probe
= bfin_serial_probe
,
1440 .remove
= __devexit_p(bfin_serial_remove
),
1441 .suspend
= bfin_serial_suspend
,
1442 .resume
= bfin_serial_resume
,
1444 .name
= DRIVER_NAME
,
1445 .owner
= THIS_MODULE
,
1449 #if defined(CONFIG_SERIAL_BFIN_CONSOLE)
1450 static __initdata
struct early_platform_driver early_bfin_serial_driver
= {
1451 .class_str
= CLASS_BFIN_CONSOLE
,
1452 .pdrv
= &bfin_serial_driver
,
1453 .requested_id
= EARLY_PLATFORM_ID_UNSET
,
1456 static int __init
bfin_serial_rs_console_init(void)
1458 early_platform_driver_register(&early_bfin_serial_driver
, DRIVER_NAME
);
1460 early_platform_driver_probe(CLASS_BFIN_CONSOLE
, BFIN_UART_NR_PORTS
, 0);
1462 register_console(&bfin_serial_console
);
1466 console_initcall(bfin_serial_rs_console_init
);
1469 #ifdef CONFIG_EARLY_PRINTK
1471 * Memory can't be allocated dynamically during earlyprink init stage.
1472 * So, do individual probe for earlyprink with a static uart port variable.
1474 static int bfin_earlyprintk_probe(struct platform_device
*pdev
)
1476 struct resource
*res
;
1479 if (pdev
->id
< 0 || pdev
->id
>= BFIN_UART_NR_PORTS
) {
1480 dev_err(&pdev
->dev
, "Wrong earlyprintk platform device id.\n");
1484 ret
= peripheral_request_list(
1485 (unsigned short *)pdev
->dev
.platform_data
, DRIVER_NAME
);
1488 "fail to request bfin serial peripherals\n");
1492 res
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
1494 dev_err(&pdev
->dev
, "Cannot get IORESOURCE_MEM\n");
1496 goto out_error_free_peripherals
;
1499 bfin_earlyprintk_port
.port
.membase
= ioremap(res
->start
,
1500 resource_size(res
));
1501 if (!bfin_earlyprintk_port
.port
.membase
) {
1502 dev_err(&pdev
->dev
, "Cannot map uart IO\n");
1504 goto out_error_free_peripherals
;
1506 bfin_earlyprintk_port
.port
.mapbase
= res
->start
;
1507 bfin_earlyprintk_port
.port
.line
= pdev
->id
;
1508 bfin_earlyprintk_port
.port
.uartclk
= get_sclk();
1509 bfin_earlyprintk_port
.port
.fifosize
= BFIN_UART_TX_FIFO_SIZE
;
1510 spin_lock_init(&bfin_earlyprintk_port
.port
.lock
);
1514 out_error_free_peripherals
:
1515 peripheral_free_list(
1516 (unsigned short *)pdev
->dev
.platform_data
);
1521 static struct platform_driver bfin_earlyprintk_driver
= {
1522 .probe
= bfin_earlyprintk_probe
,
1524 .name
= DRIVER_NAME
,
1525 .owner
= THIS_MODULE
,
1529 static __initdata
struct early_platform_driver early_bfin_earlyprintk_driver
= {
1530 .class_str
= CLASS_BFIN_EARLYPRINTK
,
1531 .pdrv
= &bfin_earlyprintk_driver
,
1532 .requested_id
= EARLY_PLATFORM_ID_UNSET
,
1535 struct console __init
*bfin_earlyserial_init(unsigned int port
,
1541 if (port
< 0 || port
>= BFIN_UART_NR_PORTS
)
1545 * Only probe resource of the given port in earlyprintk boot arg.
1546 * The expected port id should be indicated in port name string.
1548 snprintf(port_name
, 20, DRIVER_NAME
".%d", port
);
1549 early_platform_driver_register(&early_bfin_earlyprintk_driver
,
1551 early_platform_driver_probe(CLASS_BFIN_EARLYPRINTK
, 1, 0);
1553 if (!bfin_earlyprintk_port
.port
.membase
)
1556 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1558 * If we are using early serial, don't let the normal console rewind
1559 * log buffer, since that causes things to be printed multiple times
1561 bfin_serial_console
.flags
&= ~CON_PRINTBUFFER
;
1564 bfin_early_serial_console
.index
= port
;
1570 bfin_serial_set_termios(&bfin_earlyprintk_port
.port
, &t
, &t
);
1572 return &bfin_early_serial_console
;
1574 #endif /* CONFIG_EARLY_PRINTK */
1576 static int __init
bfin_serial_init(void)
1580 pr_info("Blackfin serial driver\n");
1582 ret
= uart_register_driver(&bfin_serial_reg
);
1584 pr_err("failed to register %s:%d\n",
1585 bfin_serial_reg
.driver_name
, ret
);
1588 ret
= platform_driver_register(&bfin_serial_driver
);
1590 pr_err("fail to register bfin uart\n");
1591 uart_unregister_driver(&bfin_serial_reg
);
1597 static void __exit
bfin_serial_exit(void)
1599 platform_driver_unregister(&bfin_serial_driver
);
1600 uart_unregister_driver(&bfin_serial_reg
);
1604 module_init(bfin_serial_init
);
1605 module_exit(bfin_serial_exit
);
1607 MODULE_AUTHOR("Sonic Zhang, Aubrey Li");
1608 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1609 MODULE_LICENSE("GPL");
1610 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR
);
1611 MODULE_ALIAS("platform:bfin-uart");