2 * Blackfin On-Chip Serial Driver
4 * Copyright 2006-2011 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>
38 #include <asm/bfin_serial.h>
40 #ifdef CONFIG_SERIAL_BFIN_MODULE
41 # undef CONFIG_EARLY_PRINTK
44 #ifdef CONFIG_SERIAL_BFIN_MODULE
45 # undef CONFIG_EARLY_PRINTK
48 /* UART name and device definitions */
49 #define BFIN_SERIAL_DEV_NAME "ttyBF"
50 #define BFIN_SERIAL_MAJOR 204
51 #define BFIN_SERIAL_MINOR 64
53 static struct bfin_serial_port *bfin_serial_ports[BFIN_UART_NR_PORTS];
55 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
56 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
58 # ifndef CONFIG_SERIAL_BFIN_PIO
59 # error KGDB only support UART in PIO mode.
62 static int kgdboc_port_line;
63 static int kgdboc_break_enabled;
66 * Setup for console. Argument comes from the menuconfig
68 #define DMA_RX_XCOUNT 512
69 #define DMA_RX_YCOUNT (PAGE_SIZE / DMA_RX_XCOUNT)
71 #define DMA_RX_FLUSH_JIFFIES (HZ / 50)
73 #ifdef CONFIG_SERIAL_BFIN_DMA
74 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart);
76 static void bfin_serial_tx_chars(struct bfin_serial_port *uart);
79 static void bfin_serial_reset_irda(struct uart_port *port);
81 #if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
82 defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
83 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
85 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
86 if (uart->cts_pin < 0)
87 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
89 /* CTS PIN is negative assertive. */
90 if (UART_GET_CTS(uart))
91 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
93 return TIOCM_DSR | TIOCM_CAR;
96 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
98 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
99 if (uart->rts_pin < 0)
102 /* RTS PIN is negative assertive. */
103 if (mctrl & TIOCM_RTS)
104 UART_ENABLE_RTS(uart);
106 UART_DISABLE_RTS(uart);
110 * Handle any change of modem status signal.
112 static irqreturn_t bfin_serial_mctrl_cts_int(int irq, void *dev_id)
114 struct bfin_serial_port *uart = dev_id;
115 unsigned int status = bfin_serial_get_mctrl(&uart->port);
116 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
117 struct tty_struct *tty = uart->port.state->port.tty;
119 UART_CLEAR_SCTS(uart);
120 if (tty->hw_stopped) {
123 uart_write_wakeup(&uart->port);
130 uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
135 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
137 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
140 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
146 * interrupts are disabled on entry
148 static void bfin_serial_stop_tx(struct uart_port *port)
150 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
151 #ifdef CONFIG_SERIAL_BFIN_DMA
152 struct circ_buf *xmit = &uart->port.state->xmit;
155 while (!(UART_GET_LSR(uart) & TEMT))
158 #ifdef CONFIG_SERIAL_BFIN_DMA
159 disable_dma(uart->tx_dma_channel);
160 xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
161 uart->port.icount.tx += uart->tx_count;
165 #if defined(CONFIG_BF54x) || defined(CONFIG_BF60x)
167 UART_PUT_LSR(uart, TFI);
169 UART_CLEAR_IER(uart, ETBEI);
174 * port is locked and interrupts are disabled
176 static void bfin_serial_start_tx(struct uart_port *port)
178 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
179 struct tty_struct *tty = uart->port.state->port.tty;
182 * To avoid losting RX interrupt, we reset IR function
183 * before sending data.
185 if (tty->termios.c_line == N_IRDA)
186 bfin_serial_reset_irda(port);
188 #ifdef CONFIG_SERIAL_BFIN_DMA
190 bfin_serial_dma_tx_chars(uart);
192 UART_SET_IER(uart, ETBEI);
193 bfin_serial_tx_chars(uart);
198 * Interrupts are enabled
200 static void bfin_serial_stop_rx(struct uart_port *port)
202 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
204 UART_CLEAR_IER(uart, ERBFI);
208 * Set the modem control timer to fire immediately.
210 static void bfin_serial_enable_ms(struct uart_port *port)
215 #if ANOMALY_05000363 && defined(CONFIG_SERIAL_BFIN_PIO)
216 # define UART_GET_ANOMALY_THRESHOLD(uart) ((uart)->anomaly_threshold)
217 # define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v))
219 # define UART_GET_ANOMALY_THRESHOLD(uart) 0
220 # define UART_SET_ANOMALY_THRESHOLD(uart, v)
223 #ifdef CONFIG_SERIAL_BFIN_PIO
224 static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
226 unsigned int status, ch, flg;
227 static struct timeval anomaly_start = { .tv_sec = 0 };
229 status = UART_GET_LSR(uart);
230 UART_CLEAR_LSR(uart);
232 ch = UART_GET_CHAR(uart);
233 uart->port.icount.rx++;
235 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
236 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
237 if (kgdb_connected && kgdboc_port_line == uart->port.line
238 && kgdboc_break_enabled)
239 if (ch == 0x3) {/* Ctrl + C */
244 if (!uart->port.state)
247 if (ANOMALY_05000363) {
248 /* The BF533 (and BF561) family of processors have a nice anomaly
249 * where they continuously generate characters for a "single" break.
250 * We have to basically ignore this flood until the "next" valid
251 * character comes across. Due to the nature of the flood, it is
252 * not possible to reliably catch bytes that are sent too quickly
253 * after this break. So application code talking to the Blackfin
254 * which sends a break signal must allow at least 1.5 character
255 * times after the end of the break for things to stabilize. This
256 * timeout was picked as it must absolutely be larger than 1
257 * character time +/- some percent. So 1.5 sounds good. All other
258 * Blackfin families operate properly. Woo.
260 if (anomaly_start.tv_sec) {
264 if ((~ch & (~ch + 1)) & 0xff)
265 goto known_good_char;
267 do_gettimeofday(&curr);
268 if (curr.tv_sec - anomaly_start.tv_sec > 1)
269 goto known_good_char;
272 if (curr.tv_sec != anomaly_start.tv_sec)
273 usecs += USEC_PER_SEC;
274 usecs += curr.tv_usec - anomaly_start.tv_usec;
276 if (usecs > UART_GET_ANOMALY_THRESHOLD(uart))
277 goto known_good_char;
280 anomaly_start.tv_sec = 0;
282 anomaly_start = curr;
288 anomaly_start.tv_sec = 0;
293 if (ANOMALY_05000363)
294 if (bfin_revid() < 5)
295 do_gettimeofday(&anomaly_start);
296 uart->port.icount.brk++;
297 if (uart_handle_break(&uart->port))
299 status &= ~(PE | FE);
302 uart->port.icount.parity++;
304 uart->port.icount.overrun++;
306 uart->port.icount.frame++;
308 status &= uart->port.read_status_mask;
312 else if (status & PE)
314 else if (status & FE)
319 if (uart_handle_sysrq_char(&uart->port, ch))
322 uart_insert_char(&uart->port, status, OE, ch, flg);
325 tty_flip_buffer_push(&uart->port.state->port);
328 static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
330 struct circ_buf *xmit = &uart->port.state->xmit;
332 if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
333 #if defined(CONFIG_BF54x) || defined(CONFIG_BF60x)
335 UART_PUT_LSR(uart, TFI);
338 * 05000215 - we always clear ETBEI within last UART TX
339 * interrupt to end a string. It is always set
340 * when start a new tx.
342 UART_CLEAR_IER(uart, ETBEI);
346 if (uart->port.x_char) {
347 UART_PUT_CHAR(uart, uart->port.x_char);
348 uart->port.icount.tx++;
349 uart->port.x_char = 0;
352 while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
353 UART_PUT_CHAR(uart, xmit->buf[xmit->tail]);
354 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
355 uart->port.icount.tx++;
358 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
359 uart_write_wakeup(&uart->port);
362 static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
364 struct bfin_serial_port *uart = dev_id;
366 while (UART_GET_LSR(uart) & DR)
367 bfin_serial_rx_chars(uart);
372 static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
374 struct bfin_serial_port *uart = dev_id;
376 spin_lock(&uart->port.lock);
377 if (UART_GET_LSR(uart) & THRE)
378 bfin_serial_tx_chars(uart);
379 spin_unlock(&uart->port.lock);
385 #ifdef CONFIG_SERIAL_BFIN_DMA
386 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
388 struct circ_buf *xmit = &uart->port.state->xmit;
392 if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
398 if (uart->port.x_char) {
399 UART_PUT_CHAR(uart, uart->port.x_char);
400 uart->port.icount.tx++;
401 uart->port.x_char = 0;
404 uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
405 if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
406 uart->tx_count = UART_XMIT_SIZE - xmit->tail;
407 blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
408 (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
409 set_dma_config(uart->tx_dma_channel,
410 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
415 set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
416 set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
417 set_dma_x_modify(uart->tx_dma_channel, 1);
419 enable_dma(uart->tx_dma_channel);
421 UART_SET_IER(uart, ETBEI);
424 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
428 status = UART_GET_LSR(uart);
429 UART_CLEAR_LSR(uart);
431 uart->port.icount.rx +=
432 CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail,
436 uart->port.icount.brk++;
437 if (uart_handle_break(&uart->port))
438 goto dma_ignore_char;
439 status &= ~(PE | FE);
442 uart->port.icount.parity++;
444 uart->port.icount.overrun++;
446 uart->port.icount.frame++;
448 status &= uart->port.read_status_mask;
452 else if (status & PE)
454 else if (status & FE)
459 for (i = uart->rx_dma_buf.tail; ; i++) {
460 if (i >= UART_XMIT_SIZE)
462 if (i == uart->rx_dma_buf.head)
464 if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
465 uart_insert_char(&uart->port, status, OE,
466 uart->rx_dma_buf.buf[i], flg);
470 tty_flip_buffer_push(&uart->port.state->port);
473 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
478 spin_lock_irqsave(&uart->rx_lock, flags);
480 /* 2D DMA RX buffer ring is used. Because curr_y_count and
481 * curr_x_count can't be read as an atomic operation,
482 * curr_y_count should be read before curr_x_count. When
483 * curr_x_count is read, curr_y_count may already indicate
484 * next buffer line. But, the position calculated here is
485 * still indicate the old line. The wrong position data may
486 * be smaller than current buffer tail, which cause garbages
487 * are received if it is not prohibit.
489 uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
490 x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
491 uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
492 if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
493 uart->rx_dma_nrows = 0;
494 x_pos = DMA_RX_XCOUNT - x_pos;
495 if (x_pos == DMA_RX_XCOUNT)
498 pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
499 /* Ignore receiving data if new position is in the same line of
500 * current buffer tail and small.
502 if (pos > uart->rx_dma_buf.tail ||
503 uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
504 uart->rx_dma_buf.head = pos;
505 bfin_serial_dma_rx_chars(uart);
506 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
509 spin_unlock_irqrestore(&uart->rx_lock, flags);
511 mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES);
514 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
516 struct bfin_serial_port *uart = dev_id;
517 struct circ_buf *xmit = &uart->port.state->xmit;
519 spin_lock(&uart->port.lock);
520 if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
521 disable_dma(uart->tx_dma_channel);
522 clear_dma_irqstat(uart->tx_dma_channel);
524 * 05000215 - we always clear ETBEI within last UART TX
525 * interrupt to end a string. It is always set
526 * when start a new tx.
528 UART_CLEAR_IER(uart, ETBEI);
529 uart->port.icount.tx += uart->tx_count;
530 if (!(xmit->tail == 0 && xmit->head == 0)) {
531 xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
533 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
534 uart_write_wakeup(&uart->port);
537 bfin_serial_dma_tx_chars(uart);
540 spin_unlock(&uart->port.lock);
544 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
546 struct bfin_serial_port *uart = dev_id;
547 unsigned int irqstat;
550 spin_lock(&uart->rx_lock);
551 irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
552 clear_dma_irqstat(uart->rx_dma_channel);
554 uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
555 x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
556 uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
557 if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
558 uart->rx_dma_nrows = 0;
560 pos = uart->rx_dma_nrows * DMA_RX_XCOUNT;
561 if (pos > uart->rx_dma_buf.tail ||
562 uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
563 uart->rx_dma_buf.head = pos;
564 bfin_serial_dma_rx_chars(uart);
565 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
568 spin_unlock(&uart->rx_lock);
575 * Return TIOCSER_TEMT when transmitter is not busy.
577 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
579 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
582 lsr = UART_GET_LSR(uart);
589 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
591 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
592 u32 lcr = UART_GET_LCR(uart);
597 UART_PUT_LCR(uart, lcr);
601 static int bfin_serial_startup(struct uart_port *port)
603 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
605 #ifdef CONFIG_SERIAL_BFIN_DMA
606 dma_addr_t dma_handle;
608 if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
609 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
613 if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
614 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
615 free_dma(uart->rx_dma_channel);
619 set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
620 set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
622 uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
623 uart->rx_dma_buf.head = 0;
624 uart->rx_dma_buf.tail = 0;
625 uart->rx_dma_nrows = 0;
627 set_dma_config(uart->rx_dma_channel,
628 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
629 INTR_ON_ROW, DIMENSION_2D,
632 set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
633 set_dma_x_modify(uart->rx_dma_channel, 1);
634 set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
635 set_dma_y_modify(uart->rx_dma_channel, 1);
636 set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
637 enable_dma(uart->rx_dma_channel);
639 uart->rx_dma_timer.data = (unsigned long)(uart);
640 uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
641 uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
642 add_timer(&(uart->rx_dma_timer));
644 # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
645 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
646 if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled)
647 kgdboc_break_enabled = 0;
650 if (request_irq(uart->rx_irq, bfin_serial_rx_int, 0,
651 "BFIN_UART_RX", uart)) {
652 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
657 (uart->tx_irq, bfin_serial_tx_int, 0,
658 "BFIN_UART_TX", uart)) {
659 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
660 free_irq(uart->rx_irq, uart);
667 * UART2 and UART3 on BF548 share interrupt PINs and DMA
668 * controllers with SPORT2 and SPORT3. UART rx and tx
669 * interrupts are generated in PIO mode only when configure
670 * their peripheral mapping registers properly, which means
671 * request corresponding DMA channels in PIO mode as well.
673 unsigned uart_dma_ch_rx, uart_dma_ch_tx;
675 switch (uart->rx_irq) {
677 uart_dma_ch_rx = CH_UART3_RX;
678 uart_dma_ch_tx = CH_UART3_TX;
681 uart_dma_ch_rx = CH_UART2_RX;
682 uart_dma_ch_tx = CH_UART2_TX;
685 uart_dma_ch_rx = uart_dma_ch_tx = 0;
689 if (uart_dma_ch_rx &&
690 request_dma(uart_dma_ch_rx, "BFIN_UART_RX") < 0) {
691 printk(KERN_NOTICE"Fail to attach UART interrupt\n");
692 free_irq(uart->rx_irq, uart);
693 free_irq(uart->tx_irq, uart);
696 if (uart_dma_ch_tx &&
697 request_dma(uart_dma_ch_tx, "BFIN_UART_TX") < 0) {
698 printk(KERN_NOTICE "Fail to attach UART interrupt\n");
699 free_dma(uart_dma_ch_rx);
700 free_irq(uart->rx_irq, uart);
701 free_irq(uart->tx_irq, uart);
706 # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
707 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
712 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
713 if (uart->cts_pin >= 0) {
714 if (request_irq(gpio_to_irq(uart->cts_pin),
715 bfin_serial_mctrl_cts_int,
716 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
717 0, "BFIN_UART_CTS", uart)) {
719 pr_info("Unable to attach BlackFin UART CTS interrupt. So, disable it.\n");
722 if (uart->rts_pin >= 0) {
723 if (gpio_request(uart->rts_pin, DRIVER_NAME)) {
724 pr_info("fail to request RTS PIN at GPIO_%d\n", uart->rts_pin);
727 gpio_direction_output(uart->rts_pin, 0);
730 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
731 if (uart->cts_pin >= 0) {
732 if (request_irq(uart->status_irq, bfin_serial_mctrl_cts_int,
733 IRQF_DISABLED, "BFIN_UART_MODEM_STATUS", uart)) {
735 dev_info(port->dev, "Unable to attach BlackFin UART Modem Status interrupt.\n");
738 /* CTS RTS PINs are negative assertive. */
739 UART_PUT_MCR(uart, UART_GET_MCR(uart) | ACTS);
740 UART_SET_IER(uart, EDSSI);
744 UART_SET_IER(uart, ERBFI);
748 static void bfin_serial_shutdown(struct uart_port *port)
750 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
752 #ifdef CONFIG_SERIAL_BFIN_DMA
753 disable_dma(uart->tx_dma_channel);
754 free_dma(uart->tx_dma_channel);
755 disable_dma(uart->rx_dma_channel);
756 free_dma(uart->rx_dma_channel);
757 del_timer(&(uart->rx_dma_timer));
758 dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
761 switch (uart->port.irq) {
763 free_dma(CH_UART3_RX);
764 free_dma(CH_UART3_TX);
767 free_dma(CH_UART2_RX);
768 free_dma(CH_UART2_TX);
774 free_irq(uart->rx_irq, uart);
775 free_irq(uart->tx_irq, uart);
778 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
779 if (uart->cts_pin >= 0)
780 free_irq(gpio_to_irq(uart->cts_pin), uart);
781 if (uart->rts_pin >= 0)
782 gpio_free(uart->rts_pin);
784 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
785 if (uart->cts_pin >= 0)
786 free_irq(uart->status_irq, uart);
791 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
792 struct ktermios *old)
794 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
796 unsigned int baud, quot;
797 unsigned int ier, lcr = 0;
798 unsigned long timeout;
800 switch (termios->c_cflag & CSIZE) {
814 printk(KERN_ERR "%s: word length not supported\n",
819 * 05000231 - STOP bit is always set to 1 whatever the user is set.
821 if (termios->c_cflag & CSTOPB) {
822 if (ANOMALY_05000231)
823 printk(KERN_WARNING "STOP bits other than 1 is not "
824 "supported in case of anomaly 05000231.\n");
828 if (termios->c_cflag & PARENB)
830 if (!(termios->c_cflag & PARODD))
832 if (termios->c_cflag & CMSPAR)
835 spin_lock_irqsave(&uart->port.lock, flags);
837 port->read_status_mask = OE;
838 if (termios->c_iflag & INPCK)
839 port->read_status_mask |= (FE | PE);
840 if (termios->c_iflag & (BRKINT | PARMRK))
841 port->read_status_mask |= BI;
844 * Characters to ignore
846 port->ignore_status_mask = 0;
847 if (termios->c_iflag & IGNPAR)
848 port->ignore_status_mask |= FE | PE;
849 if (termios->c_iflag & IGNBRK) {
850 port->ignore_status_mask |= BI;
852 * If we're ignoring parity and break indicators,
853 * ignore overruns too (for real raw support).
855 if (termios->c_iflag & IGNPAR)
856 port->ignore_status_mask |= OE;
859 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
860 quot = uart_get_divisor(port, baud);
862 /* If discipline is not IRDA, apply ANOMALY_05000230 */
863 if (termios->c_line != N_IRDA)
864 quot -= ANOMALY_05000230;
866 UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
868 /* Wait till the transfer buffer is empty */
869 timeout = jiffies + msecs_to_jiffies(10);
870 while (UART_GET_GCTL(uart) & UCEN && !(UART_GET_LSR(uart) & TEMT))
871 if (time_after(jiffies, timeout)) {
872 dev_warn(port->dev, "timeout waiting for TX buffer empty\n");
877 ier = UART_GET_IER(uart);
878 UART_PUT_GCTL(uart, UART_GET_GCTL(uart) & ~UCEN);
879 UART_DISABLE_INTS(uart);
881 /* Set DLAB in LCR to Access CLK */
884 UART_PUT_CLK(uart, quot);
887 /* Clear DLAB in LCR to Access THR RBR IER */
888 UART_CLEAR_DLAB(uart);
890 UART_PUT_LCR(uart, (UART_GET_LCR(uart) & ~LCR_MASK) | lcr);
893 UART_ENABLE_INTS(uart, ier);
894 UART_PUT_GCTL(uart, UART_GET_GCTL(uart) | UCEN);
896 /* Port speed changed, update the per-port timeout. */
897 uart_update_timeout(port, termios->c_cflag, baud);
899 spin_unlock_irqrestore(&uart->port.lock, flags);
902 static const char *bfin_serial_type(struct uart_port *port)
904 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
906 return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
910 * Release the memory region(s) being used by 'port'.
912 static void bfin_serial_release_port(struct uart_port *port)
917 * Request the memory region(s) being used by 'port'.
919 static int bfin_serial_request_port(struct uart_port *port)
925 * Configure/autoconfigure the port.
927 static void bfin_serial_config_port(struct uart_port *port, int flags)
929 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
931 if (flags & UART_CONFIG_TYPE &&
932 bfin_serial_request_port(&uart->port) == 0)
933 uart->port.type = PORT_BFIN;
937 * Verify the new serial_struct (for TIOCSSERIAL).
938 * The only change we allow are to the flags and type, and
939 * even then only between PORT_BFIN and PORT_UNKNOWN
942 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
948 * Enable the IrDA function if tty->ldisc.num is N_IRDA.
949 * In other cases, disable IrDA function.
951 static void bfin_serial_set_ldisc(struct uart_port *port, int ld)
953 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
958 val = UART_GET_GCTL(uart);
959 val |= (UMOD_IRDA | RPOLC);
960 UART_PUT_GCTL(uart, val);
963 val = UART_GET_GCTL(uart);
964 val &= ~(UMOD_MASK | RPOLC);
965 UART_PUT_GCTL(uart, val);
969 static void bfin_serial_reset_irda(struct uart_port *port)
971 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
974 val = UART_GET_GCTL(uart);
975 val &= ~(UMOD_MASK | RPOLC);
976 UART_PUT_GCTL(uart, val);
978 val |= (UMOD_IRDA | RPOLC);
979 UART_PUT_GCTL(uart, val);
983 #ifdef CONFIG_CONSOLE_POLL
985 * 05000099 - Because we only use THRE in poll_put and DR in poll_get,
986 * losing other bits of UART_LSR is not a problem here.
988 static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr)
990 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
992 while (!(UART_GET_LSR(uart) & THRE))
995 UART_CLEAR_DLAB(uart);
996 UART_PUT_CHAR(uart, (unsigned char)chr);
999 static int bfin_serial_poll_get_char(struct uart_port *port)
1001 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1004 while (!(UART_GET_LSR(uart) & DR))
1007 UART_CLEAR_DLAB(uart);
1008 chr = UART_GET_CHAR(uart);
1014 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
1015 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
1016 static void bfin_kgdboc_port_shutdown(struct uart_port *port)
1018 if (kgdboc_break_enabled) {
1019 kgdboc_break_enabled = 0;
1020 bfin_serial_shutdown(port);
1024 static int bfin_kgdboc_port_startup(struct uart_port *port)
1026 kgdboc_port_line = port->line;
1027 kgdboc_break_enabled = !bfin_serial_startup(port);
1032 static struct uart_ops bfin_serial_pops = {
1033 .tx_empty = bfin_serial_tx_empty,
1034 .set_mctrl = bfin_serial_set_mctrl,
1035 .get_mctrl = bfin_serial_get_mctrl,
1036 .stop_tx = bfin_serial_stop_tx,
1037 .start_tx = bfin_serial_start_tx,
1038 .stop_rx = bfin_serial_stop_rx,
1039 .enable_ms = bfin_serial_enable_ms,
1040 .break_ctl = bfin_serial_break_ctl,
1041 .startup = bfin_serial_startup,
1042 .shutdown = bfin_serial_shutdown,
1043 .set_termios = bfin_serial_set_termios,
1044 .set_ldisc = bfin_serial_set_ldisc,
1045 .type = bfin_serial_type,
1046 .release_port = bfin_serial_release_port,
1047 .request_port = bfin_serial_request_port,
1048 .config_port = bfin_serial_config_port,
1049 .verify_port = bfin_serial_verify_port,
1050 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
1051 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
1052 .kgdboc_port_startup = bfin_kgdboc_port_startup,
1053 .kgdboc_port_shutdown = bfin_kgdboc_port_shutdown,
1055 #ifdef CONFIG_CONSOLE_POLL
1056 .poll_put_char = bfin_serial_poll_put_char,
1057 .poll_get_char = bfin_serial_poll_get_char,
1061 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
1063 * If the port was already initialised (eg, by a boot loader),
1064 * try to determine the current setup.
1067 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
1068 int *parity, int *bits)
1070 unsigned int status;
1072 status = UART_GET_IER(uart) & (ERBFI | ETBEI);
1073 if (status == (ERBFI | ETBEI)) {
1074 /* ok, the port was enabled */
1077 lcr = UART_GET_LCR(uart);
1086 *bits = ((lcr & WLS_MASK) >> WLS_OFFSET) + 5;
1088 /* Set DLAB in LCR to Access CLK */
1089 UART_SET_DLAB(uart);
1091 clk = UART_GET_CLK(uart);
1093 /* Clear DLAB in LCR to Access THR RBR IER */
1094 UART_CLEAR_DLAB(uart);
1096 *baud = get_sclk() / (16*clk);
1098 pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits);
1101 static struct uart_driver bfin_serial_reg;
1103 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1105 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1106 while (!(UART_GET_LSR(uart) & THRE))
1108 UART_PUT_CHAR(uart, ch);
1111 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1112 defined (CONFIG_EARLY_PRINTK) */
1114 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1115 #define CLASS_BFIN_CONSOLE "bfin-console"
1117 * Interrupts are disabled on entering
1120 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1122 struct bfin_serial_port *uart = bfin_serial_ports[co->index];
1123 unsigned long flags;
1125 spin_lock_irqsave(&uart->port.lock, flags);
1126 uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1127 spin_unlock_irqrestore(&uart->port.lock, flags);
1132 bfin_serial_console_setup(struct console *co, char *options)
1134 struct bfin_serial_port *uart;
1138 # if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
1139 defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
1146 * Check whether an invalid uart number has been specified, and
1147 * if so, search for the first available port that does have
1150 if (co->index < 0 || co->index >= BFIN_UART_NR_PORTS)
1153 uart = bfin_serial_ports[co->index];
1158 uart_parse_options(options, &baud, &parity, &bits, &flow);
1160 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1162 return uart_set_options(&uart->port, co, baud, parity, bits, flow);
1165 static struct console bfin_serial_console = {
1166 .name = BFIN_SERIAL_DEV_NAME,
1167 .write = bfin_serial_console_write,
1168 .device = uart_console_device,
1169 .setup = bfin_serial_console_setup,
1170 .flags = CON_PRINTBUFFER,
1172 .data = &bfin_serial_reg,
1174 #define BFIN_SERIAL_CONSOLE (&bfin_serial_console)
1176 #define BFIN_SERIAL_CONSOLE NULL
1177 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1179 #ifdef CONFIG_EARLY_PRINTK
1180 static struct bfin_serial_port bfin_earlyprintk_port;
1181 #define CLASS_BFIN_EARLYPRINTK "bfin-earlyprintk"
1184 * Interrupts are disabled on entering
1187 bfin_earlyprintk_console_write(struct console *co, const char *s, unsigned int count)
1189 unsigned long flags;
1191 if (bfin_earlyprintk_port.port.line != co->index)
1194 spin_lock_irqsave(&bfin_earlyprintk_port.port.lock, flags);
1195 uart_console_write(&bfin_earlyprintk_port.port, s, count,
1196 bfin_serial_console_putchar);
1197 spin_unlock_irqrestore(&bfin_earlyprintk_port.port.lock, flags);
1201 * This should have a .setup or .early_setup in it, but then things get called
1202 * without the command line options, and the baud rate gets messed up - so
1203 * don't let the common infrastructure play with things. (see calls to setup
1204 * & earlysetup in ./kernel/printk.c:register_console()
1206 static struct __initdata console bfin_early_serial_console = {
1207 .name = "early_BFuart",
1208 .write = bfin_earlyprintk_console_write,
1209 .device = uart_console_device,
1210 .flags = CON_PRINTBUFFER,
1212 .data = &bfin_serial_reg,
1216 static struct uart_driver bfin_serial_reg = {
1217 .owner = THIS_MODULE,
1218 .driver_name = DRIVER_NAME,
1219 .dev_name = BFIN_SERIAL_DEV_NAME,
1220 .major = BFIN_SERIAL_MAJOR,
1221 .minor = BFIN_SERIAL_MINOR,
1222 .nr = BFIN_UART_NR_PORTS,
1223 .cons = BFIN_SERIAL_CONSOLE,
1226 static int bfin_serial_suspend(struct platform_device *pdev, pm_message_t state)
1228 struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1230 return uart_suspend_port(&bfin_serial_reg, &uart->port);
1233 static int bfin_serial_resume(struct platform_device *pdev)
1235 struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1237 return uart_resume_port(&bfin_serial_reg, &uart->port);
1240 static int bfin_serial_probe(struct platform_device *pdev)
1242 struct resource *res;
1243 struct bfin_serial_port *uart = NULL;
1246 if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
1247 dev_err(&pdev->dev, "Wrong bfin uart platform device id.\n");
1251 if (bfin_serial_ports[pdev->id] == NULL) {
1253 uart = kzalloc(sizeof(*uart), GFP_KERNEL);
1256 "fail to malloc bfin_serial_port\n");
1259 bfin_serial_ports[pdev->id] = uart;
1261 #ifdef CONFIG_EARLY_PRINTK
1262 if (!(bfin_earlyprintk_port.port.membase
1263 && bfin_earlyprintk_port.port.line == pdev->id)) {
1265 * If the peripheral PINs of current port is allocated
1266 * in earlyprintk probe stage, don't do it again.
1269 ret = peripheral_request_list(
1270 (unsigned short *)pdev->dev.platform_data, DRIVER_NAME);
1273 "fail to request bfin serial peripherals\n");
1274 goto out_error_free_mem;
1276 #ifdef CONFIG_EARLY_PRINTK
1280 spin_lock_init(&uart->port.lock);
1281 uart->port.uartclk = get_sclk();
1282 uart->port.fifosize = BFIN_UART_TX_FIFO_SIZE;
1283 uart->port.ops = &bfin_serial_pops;
1284 uart->port.line = pdev->id;
1285 uart->port.iotype = UPIO_MEM;
1286 uart->port.flags = UPF_BOOT_AUTOCONF;
1288 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1290 dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
1292 goto out_error_free_peripherals;
1295 uart->port.membase = ioremap(res->start, resource_size(res));
1296 if (!uart->port.membase) {
1297 dev_err(&pdev->dev, "Cannot map uart IO\n");
1299 goto out_error_free_peripherals;
1301 uart->port.mapbase = res->start;
1303 uart->tx_irq = platform_get_irq(pdev, 0);
1304 if (uart->tx_irq < 0) {
1305 dev_err(&pdev->dev, "No uart TX IRQ specified\n");
1307 goto out_error_unmap;
1310 uart->rx_irq = platform_get_irq(pdev, 1);
1311 if (uart->rx_irq < 0) {
1312 dev_err(&pdev->dev, "No uart RX IRQ specified\n");
1314 goto out_error_unmap;
1316 uart->port.irq = uart->rx_irq;
1318 uart->status_irq = platform_get_irq(pdev, 2);
1319 if (uart->status_irq < 0) {
1320 dev_err(&pdev->dev, "No uart status IRQ specified\n");
1322 goto out_error_unmap;
1325 #ifdef CONFIG_SERIAL_BFIN_DMA
1326 spin_lock_init(&uart->rx_lock);
1330 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
1332 dev_err(&pdev->dev, "No uart TX DMA channel specified\n");
1334 goto out_error_unmap;
1336 uart->tx_dma_channel = res->start;
1338 res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
1340 dev_err(&pdev->dev, "No uart RX DMA channel specified\n");
1342 goto out_error_unmap;
1344 uart->rx_dma_channel = res->start;
1346 init_timer(&(uart->rx_dma_timer));
1349 #if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
1350 defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
1351 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
1355 uart->cts_pin = res->start;
1356 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
1357 uart->port.flags |= ASYNC_CTS_FLOW;
1361 res = platform_get_resource(pdev, IORESOURCE_IO, 1);
1365 uart->rts_pin = res->start;
1369 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1370 if (!is_early_platform_device(pdev)) {
1372 uart = bfin_serial_ports[pdev->id];
1373 uart->port.dev = &pdev->dev;
1374 dev_set_drvdata(&pdev->dev, uart);
1375 ret = uart_add_one_port(&bfin_serial_reg, &uart->port);
1376 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1385 iounmap(uart->port.membase);
1386 out_error_free_peripherals:
1387 peripheral_free_list(
1388 (unsigned short *)pdev->dev.platform_data);
1391 bfin_serial_ports[pdev->id] = NULL;
1397 static int bfin_serial_remove(struct platform_device *pdev)
1399 struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1401 dev_set_drvdata(&pdev->dev, NULL);
1404 uart_remove_one_port(&bfin_serial_reg, &uart->port);
1405 iounmap(uart->port.membase);
1406 peripheral_free_list(
1407 (unsigned short *)pdev->dev.platform_data);
1409 bfin_serial_ports[pdev->id] = NULL;
1415 static struct platform_driver bfin_serial_driver = {
1416 .probe = bfin_serial_probe,
1417 .remove = bfin_serial_remove,
1418 .suspend = bfin_serial_suspend,
1419 .resume = bfin_serial_resume,
1421 .name = DRIVER_NAME,
1422 .owner = THIS_MODULE,
1426 #if defined(CONFIG_SERIAL_BFIN_CONSOLE)
1427 static __initdata struct early_platform_driver early_bfin_serial_driver = {
1428 .class_str = CLASS_BFIN_CONSOLE,
1429 .pdrv = &bfin_serial_driver,
1430 .requested_id = EARLY_PLATFORM_ID_UNSET,
1433 static int __init bfin_serial_rs_console_init(void)
1435 early_platform_driver_register(&early_bfin_serial_driver, DRIVER_NAME);
1437 early_platform_driver_probe(CLASS_BFIN_CONSOLE, BFIN_UART_NR_PORTS, 0);
1439 register_console(&bfin_serial_console);
1443 console_initcall(bfin_serial_rs_console_init);
1446 #ifdef CONFIG_EARLY_PRINTK
1448 * Memory can't be allocated dynamically during earlyprink init stage.
1449 * So, do individual probe for earlyprink with a static uart port variable.
1451 static int bfin_earlyprintk_probe(struct platform_device *pdev)
1453 struct resource *res;
1456 if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
1457 dev_err(&pdev->dev, "Wrong earlyprintk platform device id.\n");
1461 ret = peripheral_request_list(
1462 (unsigned short *)pdev->dev.platform_data, DRIVER_NAME);
1465 "fail to request bfin serial peripherals\n");
1469 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1471 dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
1473 goto out_error_free_peripherals;
1476 bfin_earlyprintk_port.port.membase = ioremap(res->start,
1477 resource_size(res));
1478 if (!bfin_earlyprintk_port.port.membase) {
1479 dev_err(&pdev->dev, "Cannot map uart IO\n");
1481 goto out_error_free_peripherals;
1483 bfin_earlyprintk_port.port.mapbase = res->start;
1484 bfin_earlyprintk_port.port.line = pdev->id;
1485 bfin_earlyprintk_port.port.uartclk = get_sclk();
1486 bfin_earlyprintk_port.port.fifosize = BFIN_UART_TX_FIFO_SIZE;
1487 spin_lock_init(&bfin_earlyprintk_port.port.lock);
1491 out_error_free_peripherals:
1492 peripheral_free_list(
1493 (unsigned short *)pdev->dev.platform_data);
1498 static struct platform_driver bfin_earlyprintk_driver = {
1499 .probe = bfin_earlyprintk_probe,
1501 .name = DRIVER_NAME,
1502 .owner = THIS_MODULE,
1506 static __initdata struct early_platform_driver early_bfin_earlyprintk_driver = {
1507 .class_str = CLASS_BFIN_EARLYPRINTK,
1508 .pdrv = &bfin_earlyprintk_driver,
1509 .requested_id = EARLY_PLATFORM_ID_UNSET,
1512 struct console __init *bfin_earlyserial_init(unsigned int port,
1518 if (port < 0 || port >= BFIN_UART_NR_PORTS)
1522 * Only probe resource of the given port in earlyprintk boot arg.
1523 * The expected port id should be indicated in port name string.
1525 snprintf(port_name, 20, DRIVER_NAME ".%d", port);
1526 early_platform_driver_register(&early_bfin_earlyprintk_driver,
1528 early_platform_driver_probe(CLASS_BFIN_EARLYPRINTK, 1, 0);
1530 if (!bfin_earlyprintk_port.port.membase)
1533 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1535 * If we are using early serial, don't let the normal console rewind
1536 * log buffer, since that causes things to be printed multiple times
1538 bfin_serial_console.flags &= ~CON_PRINTBUFFER;
1541 bfin_early_serial_console.index = port;
1547 bfin_serial_set_termios(&bfin_earlyprintk_port.port, &t, &t);
1549 return &bfin_early_serial_console;
1551 #endif /* CONFIG_EARLY_PRINTK */
1553 static int __init bfin_serial_init(void)
1557 pr_info("Blackfin serial driver\n");
1559 ret = uart_register_driver(&bfin_serial_reg);
1561 pr_err("failed to register %s:%d\n",
1562 bfin_serial_reg.driver_name, ret);
1565 ret = platform_driver_register(&bfin_serial_driver);
1567 pr_err("fail to register bfin uart\n");
1568 uart_unregister_driver(&bfin_serial_reg);
1574 static void __exit bfin_serial_exit(void)
1576 platform_driver_unregister(&bfin_serial_driver);
1577 uart_unregister_driver(&bfin_serial_reg);
1581 module_init(bfin_serial_init);
1582 module_exit(bfin_serial_exit);
1584 MODULE_AUTHOR("Sonic Zhang, Aubrey Li");
1585 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1586 MODULE_LICENSE("GPL");
1587 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);
1588 MODULE_ALIAS("platform:bfin-uart");