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 struct tty_struct *tty = NULL;
227 unsigned int status, ch, flg;
228 static struct timeval anomaly_start = { .tv_sec = 0 };
230 status = UART_GET_LSR(uart);
231 UART_CLEAR_LSR(uart);
233 ch = UART_GET_CHAR(uart);
234 uart->port.icount.rx++;
236 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
237 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
238 if (kgdb_connected && kgdboc_port_line == uart->port.line
239 && kgdboc_break_enabled)
240 if (ch == 0x3) {/* Ctrl + C */
245 if (!uart->port.state || !uart->port.state->port.tty)
248 tty = uart->port.state->port.tty;
250 if (ANOMALY_05000363) {
251 /* The BF533 (and BF561) family of processors have a nice anomaly
252 * where they continuously generate characters for a "single" break.
253 * We have to basically ignore this flood until the "next" valid
254 * character comes across. Due to the nature of the flood, it is
255 * not possible to reliably catch bytes that are sent too quickly
256 * after this break. So application code talking to the Blackfin
257 * which sends a break signal must allow at least 1.5 character
258 * times after the end of the break for things to stabilize. This
259 * timeout was picked as it must absolutely be larger than 1
260 * character time +/- some percent. So 1.5 sounds good. All other
261 * Blackfin families operate properly. Woo.
263 if (anomaly_start.tv_sec) {
267 if ((~ch & (~ch + 1)) & 0xff)
268 goto known_good_char;
270 do_gettimeofday(&curr);
271 if (curr.tv_sec - anomaly_start.tv_sec > 1)
272 goto known_good_char;
275 if (curr.tv_sec != anomaly_start.tv_sec)
276 usecs += USEC_PER_SEC;
277 usecs += curr.tv_usec - anomaly_start.tv_usec;
279 if (usecs > UART_GET_ANOMALY_THRESHOLD(uart))
280 goto known_good_char;
283 anomaly_start.tv_sec = 0;
285 anomaly_start = curr;
291 anomaly_start.tv_sec = 0;
296 if (ANOMALY_05000363)
297 if (bfin_revid() < 5)
298 do_gettimeofday(&anomaly_start);
299 uart->port.icount.brk++;
300 if (uart_handle_break(&uart->port))
302 status &= ~(PE | FE);
305 uart->port.icount.parity++;
307 uart->port.icount.overrun++;
309 uart->port.icount.frame++;
311 status &= uart->port.read_status_mask;
315 else if (status & PE)
317 else if (status & FE)
322 if (uart_handle_sysrq_char(&uart->port, ch))
325 uart_insert_char(&uart->port, status, OE, ch, flg);
328 tty_flip_buffer_push(tty);
331 static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
333 struct circ_buf *xmit = &uart->port.state->xmit;
335 if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
336 #if defined(CONFIG_BF54x) || defined(CONFIG_BF60x)
338 UART_PUT_LSR(uart, TFI);
341 * 05000215 - we always clear ETBEI within last UART TX
342 * interrupt to end a string. It is always set
343 * when start a new tx.
345 UART_CLEAR_IER(uart, ETBEI);
349 if (uart->port.x_char) {
350 UART_PUT_CHAR(uart, uart->port.x_char);
351 uart->port.icount.tx++;
352 uart->port.x_char = 0;
355 while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
356 UART_PUT_CHAR(uart, xmit->buf[xmit->tail]);
357 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
358 uart->port.icount.tx++;
361 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
362 uart_write_wakeup(&uart->port);
365 static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
367 struct bfin_serial_port *uart = dev_id;
369 while (UART_GET_LSR(uart) & DR)
370 bfin_serial_rx_chars(uart);
375 static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
377 struct bfin_serial_port *uart = dev_id;
379 spin_lock(&uart->port.lock);
380 if (UART_GET_LSR(uart) & THRE)
381 bfin_serial_tx_chars(uart);
382 spin_unlock(&uart->port.lock);
388 #ifdef CONFIG_SERIAL_BFIN_DMA
389 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
391 struct circ_buf *xmit = &uart->port.state->xmit;
395 if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
401 if (uart->port.x_char) {
402 UART_PUT_CHAR(uart, uart->port.x_char);
403 uart->port.icount.tx++;
404 uart->port.x_char = 0;
407 uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
408 if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
409 uart->tx_count = UART_XMIT_SIZE - xmit->tail;
410 blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
411 (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
412 set_dma_config(uart->tx_dma_channel,
413 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
418 set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
419 set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
420 set_dma_x_modify(uart->tx_dma_channel, 1);
422 enable_dma(uart->tx_dma_channel);
424 UART_SET_IER(uart, ETBEI);
427 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
429 struct tty_struct *tty = uart->port.state->port.tty;
432 status = UART_GET_LSR(uart);
433 UART_CLEAR_LSR(uart);
435 uart->port.icount.rx +=
436 CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail,
440 uart->port.icount.brk++;
441 if (uart_handle_break(&uart->port))
442 goto dma_ignore_char;
443 status &= ~(PE | FE);
446 uart->port.icount.parity++;
448 uart->port.icount.overrun++;
450 uart->port.icount.frame++;
452 status &= uart->port.read_status_mask;
456 else if (status & PE)
458 else if (status & FE)
463 for (i = uart->rx_dma_buf.tail; ; i++) {
464 if (i >= UART_XMIT_SIZE)
466 if (i == uart->rx_dma_buf.head)
468 if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
469 uart_insert_char(&uart->port, status, OE,
470 uart->rx_dma_buf.buf[i], flg);
474 tty_flip_buffer_push(tty);
477 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
482 spin_lock_irqsave(&uart->rx_lock, flags);
484 /* 2D DMA RX buffer ring is used. Because curr_y_count and
485 * curr_x_count can't be read as an atomic operation,
486 * curr_y_count should be read before curr_x_count. When
487 * curr_x_count is read, curr_y_count may already indicate
488 * next buffer line. But, the position calculated here is
489 * still indicate the old line. The wrong position data may
490 * be smaller than current buffer tail, which cause garbages
491 * are received if it is not prohibit.
493 uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
494 x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
495 uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
496 if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
497 uart->rx_dma_nrows = 0;
498 x_pos = DMA_RX_XCOUNT - x_pos;
499 if (x_pos == DMA_RX_XCOUNT)
502 pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
503 /* Ignore receiving data if new position is in the same line of
504 * current buffer tail and small.
506 if (pos > uart->rx_dma_buf.tail ||
507 uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
508 uart->rx_dma_buf.head = pos;
509 bfin_serial_dma_rx_chars(uart);
510 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
513 spin_unlock_irqrestore(&uart->rx_lock, flags);
515 mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES);
518 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
520 struct bfin_serial_port *uart = dev_id;
521 struct circ_buf *xmit = &uart->port.state->xmit;
523 spin_lock(&uart->port.lock);
524 if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
525 disable_dma(uart->tx_dma_channel);
526 clear_dma_irqstat(uart->tx_dma_channel);
528 * 05000215 - we always clear ETBEI within last UART TX
529 * interrupt to end a string. It is always set
530 * when start a new tx.
532 UART_CLEAR_IER(uart, ETBEI);
533 uart->port.icount.tx += uart->tx_count;
534 if (!(xmit->tail == 0 && xmit->head == 0)) {
535 xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
537 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
538 uart_write_wakeup(&uart->port);
541 bfin_serial_dma_tx_chars(uart);
544 spin_unlock(&uart->port.lock);
548 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
550 struct bfin_serial_port *uart = dev_id;
551 unsigned int irqstat;
554 spin_lock(&uart->rx_lock);
555 irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
556 clear_dma_irqstat(uart->rx_dma_channel);
558 uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
559 x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
560 uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
561 if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
562 uart->rx_dma_nrows = 0;
564 pos = uart->rx_dma_nrows * DMA_RX_XCOUNT;
565 if (pos > uart->rx_dma_buf.tail ||
566 uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
567 uart->rx_dma_buf.head = pos;
568 bfin_serial_dma_rx_chars(uart);
569 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
572 spin_unlock(&uart->rx_lock);
579 * Return TIOCSER_TEMT when transmitter is not busy.
581 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
583 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
586 lsr = UART_GET_LSR(uart);
593 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
595 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
596 u32 lcr = UART_GET_LCR(uart);
601 UART_PUT_LCR(uart, lcr);
605 static int bfin_serial_startup(struct uart_port *port)
607 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
609 #ifdef CONFIG_SERIAL_BFIN_DMA
610 dma_addr_t dma_handle;
612 if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
613 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
617 if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
618 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
619 free_dma(uart->rx_dma_channel);
623 set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
624 set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
626 uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
627 uart->rx_dma_buf.head = 0;
628 uart->rx_dma_buf.tail = 0;
629 uart->rx_dma_nrows = 0;
631 set_dma_config(uart->rx_dma_channel,
632 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
633 INTR_ON_ROW, DIMENSION_2D,
636 set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
637 set_dma_x_modify(uart->rx_dma_channel, 1);
638 set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
639 set_dma_y_modify(uart->rx_dma_channel, 1);
640 set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
641 enable_dma(uart->rx_dma_channel);
643 uart->rx_dma_timer.data = (unsigned long)(uart);
644 uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
645 uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
646 add_timer(&(uart->rx_dma_timer));
648 # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
649 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
650 if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled)
651 kgdboc_break_enabled = 0;
654 if (request_irq(uart->rx_irq, bfin_serial_rx_int, 0,
655 "BFIN_UART_RX", uart)) {
656 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
661 (uart->tx_irq, bfin_serial_tx_int, 0,
662 "BFIN_UART_TX", uart)) {
663 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
664 free_irq(uart->rx_irq, uart);
671 * UART2 and UART3 on BF548 share interrupt PINs and DMA
672 * controllers with SPORT2 and SPORT3. UART rx and tx
673 * interrupts are generated in PIO mode only when configure
674 * their peripheral mapping registers properly, which means
675 * request corresponding DMA channels in PIO mode as well.
677 unsigned uart_dma_ch_rx, uart_dma_ch_tx;
679 switch (uart->rx_irq) {
681 uart_dma_ch_rx = CH_UART3_RX;
682 uart_dma_ch_tx = CH_UART3_TX;
685 uart_dma_ch_rx = CH_UART2_RX;
686 uart_dma_ch_tx = CH_UART2_TX;
689 uart_dma_ch_rx = uart_dma_ch_tx = 0;
693 if (uart_dma_ch_rx &&
694 request_dma(uart_dma_ch_rx, "BFIN_UART_RX") < 0) {
695 printk(KERN_NOTICE"Fail to attach UART interrupt\n");
696 free_irq(uart->rx_irq, uart);
697 free_irq(uart->tx_irq, uart);
700 if (uart_dma_ch_tx &&
701 request_dma(uart_dma_ch_tx, "BFIN_UART_TX") < 0) {
702 printk(KERN_NOTICE "Fail to attach UART interrupt\n");
703 free_dma(uart_dma_ch_rx);
704 free_irq(uart->rx_irq, uart);
705 free_irq(uart->tx_irq, uart);
710 # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
711 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
716 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
717 if (uart->cts_pin >= 0) {
718 if (request_irq(gpio_to_irq(uart->cts_pin),
719 bfin_serial_mctrl_cts_int,
720 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
721 0, "BFIN_UART_CTS", uart)) {
723 pr_info("Unable to attach BlackFin UART CTS interrupt. So, disable it.\n");
726 if (uart->rts_pin >= 0) {
727 if (gpio_request(uart->rts_pin, DRIVER_NAME)) {
728 pr_info("fail to request RTS PIN at GPIO_%d\n", uart->rts_pin);
731 gpio_direction_output(uart->rts_pin, 0);
734 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
735 if (uart->cts_pin >= 0) {
736 if (request_irq(uart->status_irq, bfin_serial_mctrl_cts_int,
737 IRQF_DISABLED, "BFIN_UART_MODEM_STATUS", uart)) {
739 dev_info(port->dev, "Unable to attach BlackFin UART Modem Status interrupt.\n");
742 /* CTS RTS PINs are negative assertive. */
743 UART_PUT_MCR(uart, UART_GET_MCR(uart) | ACTS);
744 UART_SET_IER(uart, EDSSI);
748 UART_SET_IER(uart, ERBFI);
752 static void bfin_serial_shutdown(struct uart_port *port)
754 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
756 #ifdef CONFIG_SERIAL_BFIN_DMA
757 disable_dma(uart->tx_dma_channel);
758 free_dma(uart->tx_dma_channel);
759 disable_dma(uart->rx_dma_channel);
760 free_dma(uart->rx_dma_channel);
761 del_timer(&(uart->rx_dma_timer));
762 dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
765 switch (uart->port.irq) {
767 free_dma(CH_UART3_RX);
768 free_dma(CH_UART3_TX);
771 free_dma(CH_UART2_RX);
772 free_dma(CH_UART2_TX);
778 free_irq(uart->rx_irq, uart);
779 free_irq(uart->tx_irq, uart);
782 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
783 if (uart->cts_pin >= 0)
784 free_irq(gpio_to_irq(uart->cts_pin), uart);
785 if (uart->rts_pin >= 0)
786 gpio_free(uart->rts_pin);
788 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
789 if (uart->cts_pin >= 0)
790 free_irq(uart->status_irq, uart);
795 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
796 struct ktermios *old)
798 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
800 unsigned int baud, quot;
801 unsigned int ier, lcr = 0;
802 unsigned long timeout;
804 switch (termios->c_cflag & CSIZE) {
818 printk(KERN_ERR "%s: word length not supported\n",
823 * 05000231 - STOP bit is always set to 1 whatever the user is set.
825 if (termios->c_cflag & CSTOPB) {
826 if (ANOMALY_05000231)
827 printk(KERN_WARNING "STOP bits other than 1 is not "
828 "supported in case of anomaly 05000231.\n");
832 if (termios->c_cflag & PARENB)
834 if (!(termios->c_cflag & PARODD))
836 if (termios->c_cflag & CMSPAR)
839 spin_lock_irqsave(&uart->port.lock, flags);
841 port->read_status_mask = OE;
842 if (termios->c_iflag & INPCK)
843 port->read_status_mask |= (FE | PE);
844 if (termios->c_iflag & (BRKINT | PARMRK))
845 port->read_status_mask |= BI;
848 * Characters to ignore
850 port->ignore_status_mask = 0;
851 if (termios->c_iflag & IGNPAR)
852 port->ignore_status_mask |= FE | PE;
853 if (termios->c_iflag & IGNBRK) {
854 port->ignore_status_mask |= BI;
856 * If we're ignoring parity and break indicators,
857 * ignore overruns too (for real raw support).
859 if (termios->c_iflag & IGNPAR)
860 port->ignore_status_mask |= OE;
863 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
864 quot = uart_get_divisor(port, baud);
866 /* If discipline is not IRDA, apply ANOMALY_05000230 */
867 if (termios->c_line != N_IRDA)
868 quot -= ANOMALY_05000230;
870 UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
872 /* Wait till the transfer buffer is empty */
873 timeout = jiffies + msecs_to_jiffies(10);
874 while (UART_GET_GCTL(uart) & UCEN && !(UART_GET_LSR(uart) & TEMT))
875 if (time_after(jiffies, timeout)) {
876 dev_warn(port->dev, "timeout waiting for TX buffer empty\n");
881 ier = UART_GET_IER(uart);
882 UART_PUT_GCTL(uart, UART_GET_GCTL(uart) & ~UCEN);
883 UART_DISABLE_INTS(uart);
885 /* Set DLAB in LCR to Access CLK */
888 UART_PUT_CLK(uart, quot);
891 /* Clear DLAB in LCR to Access THR RBR IER */
892 UART_CLEAR_DLAB(uart);
894 UART_PUT_LCR(uart, (UART_GET_LCR(uart) & ~LCR_MASK) | lcr);
897 UART_ENABLE_INTS(uart, ier);
898 UART_PUT_GCTL(uart, UART_GET_GCTL(uart) | UCEN);
900 /* Port speed changed, update the per-port timeout. */
901 uart_update_timeout(port, termios->c_cflag, baud);
903 spin_unlock_irqrestore(&uart->port.lock, flags);
906 static const char *bfin_serial_type(struct uart_port *port)
908 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
910 return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
914 * Release the memory region(s) being used by 'port'.
916 static void bfin_serial_release_port(struct uart_port *port)
921 * Request the memory region(s) being used by 'port'.
923 static int bfin_serial_request_port(struct uart_port *port)
929 * Configure/autoconfigure the port.
931 static void bfin_serial_config_port(struct uart_port *port, int flags)
933 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
935 if (flags & UART_CONFIG_TYPE &&
936 bfin_serial_request_port(&uart->port) == 0)
937 uart->port.type = PORT_BFIN;
941 * Verify the new serial_struct (for TIOCSSERIAL).
942 * The only change we allow are to the flags and type, and
943 * even then only between PORT_BFIN and PORT_UNKNOWN
946 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
952 * Enable the IrDA function if tty->ldisc.num is N_IRDA.
953 * In other cases, disable IrDA function.
955 static void bfin_serial_set_ldisc(struct uart_port *port, int ld)
957 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
962 val = UART_GET_GCTL(uart);
963 val |= (UMOD_IRDA | RPOLC);
964 UART_PUT_GCTL(uart, val);
967 val = UART_GET_GCTL(uart);
968 val &= ~(UMOD_MASK | RPOLC);
969 UART_PUT_GCTL(uart, val);
973 static void bfin_serial_reset_irda(struct uart_port *port)
975 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
978 val = UART_GET_GCTL(uart);
979 val &= ~(UMOD_MASK | RPOLC);
980 UART_PUT_GCTL(uart, val);
982 val |= (UMOD_IRDA | RPOLC);
983 UART_PUT_GCTL(uart, val);
987 #ifdef CONFIG_CONSOLE_POLL
989 * 05000099 - Because we only use THRE in poll_put and DR in poll_get,
990 * losing other bits of UART_LSR is not a problem here.
992 static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr)
994 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
996 while (!(UART_GET_LSR(uart) & THRE))
999 UART_CLEAR_DLAB(uart);
1000 UART_PUT_CHAR(uart, (unsigned char)chr);
1003 static int bfin_serial_poll_get_char(struct uart_port *port)
1005 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1008 while (!(UART_GET_LSR(uart) & DR))
1011 UART_CLEAR_DLAB(uart);
1012 chr = UART_GET_CHAR(uart);
1018 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
1019 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
1020 static void bfin_kgdboc_port_shutdown(struct uart_port *port)
1022 if (kgdboc_break_enabled) {
1023 kgdboc_break_enabled = 0;
1024 bfin_serial_shutdown(port);
1028 static int bfin_kgdboc_port_startup(struct uart_port *port)
1030 kgdboc_port_line = port->line;
1031 kgdboc_break_enabled = !bfin_serial_startup(port);
1036 static struct uart_ops bfin_serial_pops = {
1037 .tx_empty = bfin_serial_tx_empty,
1038 .set_mctrl = bfin_serial_set_mctrl,
1039 .get_mctrl = bfin_serial_get_mctrl,
1040 .stop_tx = bfin_serial_stop_tx,
1041 .start_tx = bfin_serial_start_tx,
1042 .stop_rx = bfin_serial_stop_rx,
1043 .enable_ms = bfin_serial_enable_ms,
1044 .break_ctl = bfin_serial_break_ctl,
1045 .startup = bfin_serial_startup,
1046 .shutdown = bfin_serial_shutdown,
1047 .set_termios = bfin_serial_set_termios,
1048 .set_ldisc = bfin_serial_set_ldisc,
1049 .type = bfin_serial_type,
1050 .release_port = bfin_serial_release_port,
1051 .request_port = bfin_serial_request_port,
1052 .config_port = bfin_serial_config_port,
1053 .verify_port = bfin_serial_verify_port,
1054 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
1055 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
1056 .kgdboc_port_startup = bfin_kgdboc_port_startup,
1057 .kgdboc_port_shutdown = bfin_kgdboc_port_shutdown,
1059 #ifdef CONFIG_CONSOLE_POLL
1060 .poll_put_char = bfin_serial_poll_put_char,
1061 .poll_get_char = bfin_serial_poll_get_char,
1065 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
1067 * If the port was already initialised (eg, by a boot loader),
1068 * try to determine the current setup.
1071 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
1072 int *parity, int *bits)
1074 unsigned int status;
1076 status = UART_GET_IER(uart) & (ERBFI | ETBEI);
1077 if (status == (ERBFI | ETBEI)) {
1078 /* ok, the port was enabled */
1081 lcr = UART_GET_LCR(uart);
1090 *bits = ((lcr & WLS_MASK) >> WLS_OFFSET) + 5;
1092 /* Set DLAB in LCR to Access CLK */
1093 UART_SET_DLAB(uart);
1095 clk = UART_GET_CLK(uart);
1097 /* Clear DLAB in LCR to Access THR RBR IER */
1098 UART_CLEAR_DLAB(uart);
1100 *baud = get_sclk() / (16*clk);
1102 pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits);
1105 static struct uart_driver bfin_serial_reg;
1107 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1109 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1110 while (!(UART_GET_LSR(uart) & THRE))
1112 UART_PUT_CHAR(uart, ch);
1115 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1116 defined (CONFIG_EARLY_PRINTK) */
1118 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1119 #define CLASS_BFIN_CONSOLE "bfin-console"
1121 * Interrupts are disabled on entering
1124 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1126 struct bfin_serial_port *uart = bfin_serial_ports[co->index];
1127 unsigned long flags;
1129 spin_lock_irqsave(&uart->port.lock, flags);
1130 uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1131 spin_unlock_irqrestore(&uart->port.lock, flags);
1136 bfin_serial_console_setup(struct console *co, char *options)
1138 struct bfin_serial_port *uart;
1142 # if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
1143 defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
1150 * Check whether an invalid uart number has been specified, and
1151 * if so, search for the first available port that does have
1154 if (co->index < 0 || co->index >= BFIN_UART_NR_PORTS)
1157 uart = bfin_serial_ports[co->index];
1162 uart_parse_options(options, &baud, &parity, &bits, &flow);
1164 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1166 return uart_set_options(&uart->port, co, baud, parity, bits, flow);
1169 static struct console bfin_serial_console = {
1170 .name = BFIN_SERIAL_DEV_NAME,
1171 .write = bfin_serial_console_write,
1172 .device = uart_console_device,
1173 .setup = bfin_serial_console_setup,
1174 .flags = CON_PRINTBUFFER,
1176 .data = &bfin_serial_reg,
1178 #define BFIN_SERIAL_CONSOLE (&bfin_serial_console)
1180 #define BFIN_SERIAL_CONSOLE NULL
1181 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1183 #ifdef CONFIG_EARLY_PRINTK
1184 static struct bfin_serial_port bfin_earlyprintk_port;
1185 #define CLASS_BFIN_EARLYPRINTK "bfin-earlyprintk"
1188 * Interrupts are disabled on entering
1191 bfin_earlyprintk_console_write(struct console *co, const char *s, unsigned int count)
1193 unsigned long flags;
1195 if (bfin_earlyprintk_port.port.line != co->index)
1198 spin_lock_irqsave(&bfin_earlyprintk_port.port.lock, flags);
1199 uart_console_write(&bfin_earlyprintk_port.port, s, count,
1200 bfin_serial_console_putchar);
1201 spin_unlock_irqrestore(&bfin_earlyprintk_port.port.lock, flags);
1205 * This should have a .setup or .early_setup in it, but then things get called
1206 * without the command line options, and the baud rate gets messed up - so
1207 * don't let the common infrastructure play with things. (see calls to setup
1208 * & earlysetup in ./kernel/printk.c:register_console()
1210 static struct __initdata console bfin_early_serial_console = {
1211 .name = "early_BFuart",
1212 .write = bfin_earlyprintk_console_write,
1213 .device = uart_console_device,
1214 .flags = CON_PRINTBUFFER,
1216 .data = &bfin_serial_reg,
1220 static struct uart_driver bfin_serial_reg = {
1221 .owner = THIS_MODULE,
1222 .driver_name = DRIVER_NAME,
1223 .dev_name = BFIN_SERIAL_DEV_NAME,
1224 .major = BFIN_SERIAL_MAJOR,
1225 .minor = BFIN_SERIAL_MINOR,
1226 .nr = BFIN_UART_NR_PORTS,
1227 .cons = BFIN_SERIAL_CONSOLE,
1230 static int bfin_serial_suspend(struct platform_device *pdev, pm_message_t state)
1232 struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1234 return uart_suspend_port(&bfin_serial_reg, &uart->port);
1237 static int bfin_serial_resume(struct platform_device *pdev)
1239 struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1241 return uart_resume_port(&bfin_serial_reg, &uart->port);
1244 static int bfin_serial_probe(struct platform_device *pdev)
1246 struct resource *res;
1247 struct bfin_serial_port *uart = NULL;
1250 if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
1251 dev_err(&pdev->dev, "Wrong bfin uart platform device id.\n");
1255 if (bfin_serial_ports[pdev->id] == NULL) {
1257 uart = kzalloc(sizeof(*uart), GFP_KERNEL);
1260 "fail to malloc bfin_serial_port\n");
1263 bfin_serial_ports[pdev->id] = uart;
1265 #ifdef CONFIG_EARLY_PRINTK
1266 if (!(bfin_earlyprintk_port.port.membase
1267 && bfin_earlyprintk_port.port.line == pdev->id)) {
1269 * If the peripheral PINs of current port is allocated
1270 * in earlyprintk probe stage, don't do it again.
1273 ret = peripheral_request_list(
1274 (unsigned short *)pdev->dev.platform_data, DRIVER_NAME);
1277 "fail to request bfin serial peripherals\n");
1278 goto out_error_free_mem;
1280 #ifdef CONFIG_EARLY_PRINTK
1284 spin_lock_init(&uart->port.lock);
1285 uart->port.uartclk = get_sclk();
1286 uart->port.fifosize = BFIN_UART_TX_FIFO_SIZE;
1287 uart->port.ops = &bfin_serial_pops;
1288 uart->port.line = pdev->id;
1289 uart->port.iotype = UPIO_MEM;
1290 uart->port.flags = UPF_BOOT_AUTOCONF;
1292 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1294 dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
1296 goto out_error_free_peripherals;
1299 uart->port.membase = ioremap(res->start, resource_size(res));
1300 if (!uart->port.membase) {
1301 dev_err(&pdev->dev, "Cannot map uart IO\n");
1303 goto out_error_free_peripherals;
1305 uart->port.mapbase = res->start;
1307 uart->tx_irq = platform_get_irq(pdev, 0);
1308 if (uart->tx_irq < 0) {
1309 dev_err(&pdev->dev, "No uart TX IRQ specified\n");
1311 goto out_error_unmap;
1314 uart->rx_irq = platform_get_irq(pdev, 1);
1315 if (uart->rx_irq < 0) {
1316 dev_err(&pdev->dev, "No uart RX IRQ specified\n");
1318 goto out_error_unmap;
1320 uart->port.irq = uart->rx_irq;
1322 uart->status_irq = platform_get_irq(pdev, 2);
1323 if (uart->status_irq < 0) {
1324 dev_err(&pdev->dev, "No uart status IRQ specified\n");
1326 goto out_error_unmap;
1329 #ifdef CONFIG_SERIAL_BFIN_DMA
1330 spin_lock_init(&uart->rx_lock);
1334 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
1336 dev_err(&pdev->dev, "No uart TX DMA channel specified\n");
1338 goto out_error_unmap;
1340 uart->tx_dma_channel = res->start;
1342 res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
1344 dev_err(&pdev->dev, "No uart RX DMA channel specified\n");
1346 goto out_error_unmap;
1348 uart->rx_dma_channel = res->start;
1350 init_timer(&(uart->rx_dma_timer));
1353 #if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
1354 defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
1355 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
1359 uart->cts_pin = res->start;
1360 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
1361 uart->port.flags |= ASYNC_CTS_FLOW;
1365 res = platform_get_resource(pdev, IORESOURCE_IO, 1);
1369 uart->rts_pin = res->start;
1373 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1374 if (!is_early_platform_device(pdev)) {
1376 uart = bfin_serial_ports[pdev->id];
1377 uart->port.dev = &pdev->dev;
1378 dev_set_drvdata(&pdev->dev, uart);
1379 ret = uart_add_one_port(&bfin_serial_reg, &uart->port);
1380 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1389 iounmap(uart->port.membase);
1390 out_error_free_peripherals:
1391 peripheral_free_list(
1392 (unsigned short *)pdev->dev.platform_data);
1395 bfin_serial_ports[pdev->id] = NULL;
1401 static int bfin_serial_remove(struct platform_device *pdev)
1403 struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1405 dev_set_drvdata(&pdev->dev, NULL);
1408 uart_remove_one_port(&bfin_serial_reg, &uart->port);
1409 iounmap(uart->port.membase);
1410 peripheral_free_list(
1411 (unsigned short *)pdev->dev.platform_data);
1413 bfin_serial_ports[pdev->id] = NULL;
1419 static struct platform_driver bfin_serial_driver = {
1420 .probe = bfin_serial_probe,
1421 .remove = bfin_serial_remove,
1422 .suspend = bfin_serial_suspend,
1423 .resume = bfin_serial_resume,
1425 .name = DRIVER_NAME,
1426 .owner = THIS_MODULE,
1430 #if defined(CONFIG_SERIAL_BFIN_CONSOLE)
1431 static __initdata struct early_platform_driver early_bfin_serial_driver = {
1432 .class_str = CLASS_BFIN_CONSOLE,
1433 .pdrv = &bfin_serial_driver,
1434 .requested_id = EARLY_PLATFORM_ID_UNSET,
1437 static int __init bfin_serial_rs_console_init(void)
1439 early_platform_driver_register(&early_bfin_serial_driver, DRIVER_NAME);
1441 early_platform_driver_probe(CLASS_BFIN_CONSOLE, BFIN_UART_NR_PORTS, 0);
1443 register_console(&bfin_serial_console);
1447 console_initcall(bfin_serial_rs_console_init);
1450 #ifdef CONFIG_EARLY_PRINTK
1452 * Memory can't be allocated dynamically during earlyprink init stage.
1453 * So, do individual probe for earlyprink with a static uart port variable.
1455 static int bfin_earlyprintk_probe(struct platform_device *pdev)
1457 struct resource *res;
1460 if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
1461 dev_err(&pdev->dev, "Wrong earlyprintk platform device id.\n");
1465 ret = peripheral_request_list(
1466 (unsigned short *)pdev->dev.platform_data, DRIVER_NAME);
1469 "fail to request bfin serial peripherals\n");
1473 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1475 dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
1477 goto out_error_free_peripherals;
1480 bfin_earlyprintk_port.port.membase = ioremap(res->start,
1481 resource_size(res));
1482 if (!bfin_earlyprintk_port.port.membase) {
1483 dev_err(&pdev->dev, "Cannot map uart IO\n");
1485 goto out_error_free_peripherals;
1487 bfin_earlyprintk_port.port.mapbase = res->start;
1488 bfin_earlyprintk_port.port.line = pdev->id;
1489 bfin_earlyprintk_port.port.uartclk = get_sclk();
1490 bfin_earlyprintk_port.port.fifosize = BFIN_UART_TX_FIFO_SIZE;
1491 spin_lock_init(&bfin_earlyprintk_port.port.lock);
1495 out_error_free_peripherals:
1496 peripheral_free_list(
1497 (unsigned short *)pdev->dev.platform_data);
1502 static struct platform_driver bfin_earlyprintk_driver = {
1503 .probe = bfin_earlyprintk_probe,
1505 .name = DRIVER_NAME,
1506 .owner = THIS_MODULE,
1510 static __initdata struct early_platform_driver early_bfin_earlyprintk_driver = {
1511 .class_str = CLASS_BFIN_EARLYPRINTK,
1512 .pdrv = &bfin_earlyprintk_driver,
1513 .requested_id = EARLY_PLATFORM_ID_UNSET,
1516 struct console __init *bfin_earlyserial_init(unsigned int port,
1522 if (port < 0 || port >= BFIN_UART_NR_PORTS)
1526 * Only probe resource of the given port in earlyprintk boot arg.
1527 * The expected port id should be indicated in port name string.
1529 snprintf(port_name, 20, DRIVER_NAME ".%d", port);
1530 early_platform_driver_register(&early_bfin_earlyprintk_driver,
1532 early_platform_driver_probe(CLASS_BFIN_EARLYPRINTK, 1, 0);
1534 if (!bfin_earlyprintk_port.port.membase)
1537 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1539 * If we are using early serial, don't let the normal console rewind
1540 * log buffer, since that causes things to be printed multiple times
1542 bfin_serial_console.flags &= ~CON_PRINTBUFFER;
1545 bfin_early_serial_console.index = port;
1551 bfin_serial_set_termios(&bfin_earlyprintk_port.port, &t, &t);
1553 return &bfin_early_serial_console;
1555 #endif /* CONFIG_EARLY_PRINTK */
1557 static int __init bfin_serial_init(void)
1561 pr_info("Blackfin serial driver\n");
1563 ret = uart_register_driver(&bfin_serial_reg);
1565 pr_err("failed to register %s:%d\n",
1566 bfin_serial_reg.driver_name, ret);
1569 ret = platform_driver_register(&bfin_serial_driver);
1571 pr_err("fail to register bfin uart\n");
1572 uart_unregister_driver(&bfin_serial_reg);
1578 static void __exit bfin_serial_exit(void)
1580 platform_driver_unregister(&bfin_serial_driver);
1581 uart_unregister_driver(&bfin_serial_reg);
1585 module_init(bfin_serial_init);
1586 module_exit(bfin_serial_exit);
1588 MODULE_AUTHOR("Sonic Zhang, Aubrey Li");
1589 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1590 MODULE_LICENSE("GPL");
1591 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);
1592 MODULE_ALIAS("platform:bfin-uart");