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, 0,
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, 0,
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 0, "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 if (gpio_request(uart->rts_pin, DRIVER_NAME)) {
744 pr_info("fail to request RTS PIN at GPIO_%d\n", uart->rts_pin);
747 gpio_direction_output(uart->rts_pin, 0);
750 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
751 if (uart->cts_pin >= 0 && request_irq(uart->status_irq,
752 bfin_serial_mctrl_cts_int,
753 0, "BFIN_UART_MODEM_STATUS", uart)) {
755 pr_info("Unable to attach BlackFin UART Modem Status interrupt.\n");
758 /* CTS RTS PINs are negative assertive. */
759 UART_PUT_MCR(uart, ACTS);
760 UART_SET_IER(uart, EDSSI);
763 UART_SET_IER(uart, ERBFI);
767 static void bfin_serial_shutdown(struct uart_port *port)
769 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
771 #ifdef CONFIG_SERIAL_BFIN_DMA
772 disable_dma(uart->tx_dma_channel);
773 free_dma(uart->tx_dma_channel);
774 disable_dma(uart->rx_dma_channel);
775 free_dma(uart->rx_dma_channel);
776 del_timer(&(uart->rx_dma_timer));
777 dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
780 switch (uart->port.irq) {
782 free_dma(CH_UART3_RX);
783 free_dma(CH_UART3_TX);
786 free_dma(CH_UART2_RX);
787 free_dma(CH_UART2_TX);
793 free_irq(uart->rx_irq, uart);
794 free_irq(uart->tx_irq, uart);
797 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
798 if (uart->cts_pin >= 0)
799 free_irq(gpio_to_irq(uart->cts_pin), uart);
800 if (uart->rts_pin >= 0)
801 gpio_free(uart->rts_pin);
803 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
804 if (uart->cts_pin >= 0)
805 free_irq(uart->status_irq, uart);
810 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
811 struct ktermios *old)
813 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
815 unsigned int baud, quot;
816 unsigned short val, ier, lcr = 0;
818 switch (termios->c_cflag & CSIZE) {
832 printk(KERN_ERR "%s: word lengh not supported\n",
837 * 05000231 - STOP bit is always set to 1 whatever the user is set.
839 if (termios->c_cflag & CSTOPB) {
840 if (ANOMALY_05000231)
841 printk(KERN_WARNING "STOP bits other than 1 is not "
842 "supported in case of anomaly 05000231.\n");
846 if (termios->c_cflag & PARENB)
848 if (!(termios->c_cflag & PARODD))
850 if (termios->c_cflag & CMSPAR)
853 spin_lock_irqsave(&uart->port.lock, flags);
855 port->read_status_mask = OE;
856 if (termios->c_iflag & INPCK)
857 port->read_status_mask |= (FE | PE);
858 if (termios->c_iflag & (BRKINT | PARMRK))
859 port->read_status_mask |= BI;
862 * Characters to ignore
864 port->ignore_status_mask = 0;
865 if (termios->c_iflag & IGNPAR)
866 port->ignore_status_mask |= FE | PE;
867 if (termios->c_iflag & IGNBRK) {
868 port->ignore_status_mask |= BI;
870 * If we're ignoring parity and break indicators,
871 * ignore overruns too (for real raw support).
873 if (termios->c_iflag & IGNPAR)
874 port->ignore_status_mask |= OE;
877 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
878 quot = uart_get_divisor(port, baud);
880 /* If discipline is not IRDA, apply ANOMALY_05000230 */
881 if (termios->c_line != N_IRDA)
882 quot -= ANOMALY_05000230;
884 UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
887 ier = UART_GET_IER(uart);
888 UART_DISABLE_INTS(uart);
890 /* Set DLAB in LCR to Access DLL and DLH */
893 UART_PUT_DLL(uart, quot & 0xFF);
894 UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
897 /* Clear DLAB in LCR to Access THR RBR IER */
898 UART_CLEAR_DLAB(uart);
900 UART_PUT_LCR(uart, lcr);
903 UART_ENABLE_INTS(uart, ier);
905 val = UART_GET_GCTL(uart);
907 UART_PUT_GCTL(uart, val);
909 /* Port speed changed, update the per-port timeout. */
910 uart_update_timeout(port, termios->c_cflag, baud);
912 spin_unlock_irqrestore(&uart->port.lock, flags);
915 static const char *bfin_serial_type(struct uart_port *port)
917 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
919 return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
923 * Release the memory region(s) being used by 'port'.
925 static void bfin_serial_release_port(struct uart_port *port)
930 * Request the memory region(s) being used by 'port'.
932 static int bfin_serial_request_port(struct uart_port *port)
938 * Configure/autoconfigure the port.
940 static void bfin_serial_config_port(struct uart_port *port, int flags)
942 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
944 if (flags & UART_CONFIG_TYPE &&
945 bfin_serial_request_port(&uart->port) == 0)
946 uart->port.type = PORT_BFIN;
950 * Verify the new serial_struct (for TIOCSSERIAL).
951 * The only change we allow are to the flags and type, and
952 * even then only between PORT_BFIN and PORT_UNKNOWN
955 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
961 * Enable the IrDA function if tty->ldisc.num is N_IRDA.
962 * In other cases, disable IrDA function.
964 static void bfin_serial_set_ldisc(struct uart_port *port, int ld)
966 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
971 val = UART_GET_GCTL(uart);
972 val |= (IREN | RPOLC);
973 UART_PUT_GCTL(uart, val);
976 val = UART_GET_GCTL(uart);
977 val &= ~(IREN | RPOLC);
978 UART_PUT_GCTL(uart, val);
982 static void bfin_serial_reset_irda(struct uart_port *port)
984 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
987 val = UART_GET_GCTL(uart);
988 val &= ~(IREN | RPOLC);
989 UART_PUT_GCTL(uart, val);
991 val |= (IREN | RPOLC);
992 UART_PUT_GCTL(uart, val);
996 #ifdef CONFIG_CONSOLE_POLL
998 * 05000099 - Because we only use THRE in poll_put and DR in poll_get,
999 * losing other bits of UART_LSR is not a problem here.
1001 static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr)
1003 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1005 while (!(UART_GET_LSR(uart) & THRE))
1008 UART_CLEAR_DLAB(uart);
1009 UART_PUT_CHAR(uart, (unsigned char)chr);
1012 static int bfin_serial_poll_get_char(struct uart_port *port)
1014 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1017 while (!(UART_GET_LSR(uart) & DR))
1020 UART_CLEAR_DLAB(uart);
1021 chr = UART_GET_CHAR(uart);
1027 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
1028 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
1029 static void bfin_kgdboc_port_shutdown(struct uart_port *port)
1031 if (kgdboc_break_enabled) {
1032 kgdboc_break_enabled = 0;
1033 bfin_serial_shutdown(port);
1037 static int bfin_kgdboc_port_startup(struct uart_port *port)
1039 kgdboc_port_line = port->line;
1040 kgdboc_break_enabled = !bfin_serial_startup(port);
1045 static struct uart_ops bfin_serial_pops = {
1046 .tx_empty = bfin_serial_tx_empty,
1047 .set_mctrl = bfin_serial_set_mctrl,
1048 .get_mctrl = bfin_serial_get_mctrl,
1049 .stop_tx = bfin_serial_stop_tx,
1050 .start_tx = bfin_serial_start_tx,
1051 .stop_rx = bfin_serial_stop_rx,
1052 .enable_ms = bfin_serial_enable_ms,
1053 .break_ctl = bfin_serial_break_ctl,
1054 .startup = bfin_serial_startup,
1055 .shutdown = bfin_serial_shutdown,
1056 .set_termios = bfin_serial_set_termios,
1057 .set_ldisc = bfin_serial_set_ldisc,
1058 .type = bfin_serial_type,
1059 .release_port = bfin_serial_release_port,
1060 .request_port = bfin_serial_request_port,
1061 .config_port = bfin_serial_config_port,
1062 .verify_port = bfin_serial_verify_port,
1063 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
1064 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
1065 .kgdboc_port_startup = bfin_kgdboc_port_startup,
1066 .kgdboc_port_shutdown = bfin_kgdboc_port_shutdown,
1068 #ifdef CONFIG_CONSOLE_POLL
1069 .poll_put_char = bfin_serial_poll_put_char,
1070 .poll_get_char = bfin_serial_poll_get_char,
1074 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
1076 * If the port was already initialised (eg, by a boot loader),
1077 * try to determine the current setup.
1080 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
1081 int *parity, int *bits)
1083 unsigned short status;
1085 status = UART_GET_IER(uart) & (ERBFI | ETBEI);
1086 if (status == (ERBFI | ETBEI)) {
1087 /* ok, the port was enabled */
1090 lcr = UART_GET_LCR(uart);
1099 switch (lcr & 0x03) {
1113 /* Set DLAB in LCR to Access DLL and DLH */
1114 UART_SET_DLAB(uart);
1116 dll = UART_GET_DLL(uart);
1117 dlh = UART_GET_DLH(uart);
1119 /* Clear DLAB in LCR to Access THR RBR IER */
1120 UART_CLEAR_DLAB(uart);
1122 *baud = get_sclk() / (16*(dll | dlh << 8));
1124 pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits);
1127 static struct uart_driver bfin_serial_reg;
1129 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1131 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1132 while (!(UART_GET_LSR(uart) & THRE))
1134 UART_PUT_CHAR(uart, ch);
1137 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1138 defined (CONFIG_EARLY_PRINTK) */
1140 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1141 #define CLASS_BFIN_CONSOLE "bfin-console"
1143 * Interrupts are disabled on entering
1146 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1148 struct bfin_serial_port *uart = bfin_serial_ports[co->index];
1149 unsigned long flags;
1151 spin_lock_irqsave(&uart->port.lock, flags);
1152 uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1153 spin_unlock_irqrestore(&uart->port.lock, flags);
1158 bfin_serial_console_setup(struct console *co, char *options)
1160 struct bfin_serial_port *uart;
1164 # if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
1165 defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
1172 * Check whether an invalid uart number has been specified, and
1173 * if so, search for the first available port that does have
1176 if (co->index < 0 || co->index >= BFIN_UART_NR_PORTS)
1179 uart = bfin_serial_ports[co->index];
1184 uart_parse_options(options, &baud, &parity, &bits, &flow);
1186 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1188 return uart_set_options(&uart->port, co, baud, parity, bits, flow);
1191 static struct console bfin_serial_console = {
1192 .name = BFIN_SERIAL_DEV_NAME,
1193 .write = bfin_serial_console_write,
1194 .device = uart_console_device,
1195 .setup = bfin_serial_console_setup,
1196 .flags = CON_PRINTBUFFER,
1198 .data = &bfin_serial_reg,
1200 #define BFIN_SERIAL_CONSOLE (&bfin_serial_console)
1202 #define BFIN_SERIAL_CONSOLE NULL
1203 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1205 #ifdef CONFIG_EARLY_PRINTK
1206 static struct bfin_serial_port bfin_earlyprintk_port;
1207 #define CLASS_BFIN_EARLYPRINTK "bfin-earlyprintk"
1210 * Interrupts are disabled on entering
1213 bfin_earlyprintk_console_write(struct console *co, const char *s, unsigned int count)
1215 unsigned long flags;
1217 if (bfin_earlyprintk_port.port.line != co->index)
1220 spin_lock_irqsave(&bfin_earlyprintk_port.port.lock, flags);
1221 uart_console_write(&bfin_earlyprintk_port.port, s, count,
1222 bfin_serial_console_putchar);
1223 spin_unlock_irqrestore(&bfin_earlyprintk_port.port.lock, flags);
1227 * This should have a .setup or .early_setup in it, but then things get called
1228 * without the command line options, and the baud rate gets messed up - so
1229 * don't let the common infrastructure play with things. (see calls to setup
1230 * & earlysetup in ./kernel/printk.c:register_console()
1232 static struct __initdata console bfin_early_serial_console = {
1233 .name = "early_BFuart",
1234 .write = bfin_earlyprintk_console_write,
1235 .device = uart_console_device,
1236 .flags = CON_PRINTBUFFER,
1238 .data = &bfin_serial_reg,
1242 static struct uart_driver bfin_serial_reg = {
1243 .owner = THIS_MODULE,
1244 .driver_name = DRIVER_NAME,
1245 .dev_name = BFIN_SERIAL_DEV_NAME,
1246 .major = BFIN_SERIAL_MAJOR,
1247 .minor = BFIN_SERIAL_MINOR,
1248 .nr = BFIN_UART_NR_PORTS,
1249 .cons = BFIN_SERIAL_CONSOLE,
1252 static int bfin_serial_suspend(struct platform_device *pdev, pm_message_t state)
1254 struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1256 return uart_suspend_port(&bfin_serial_reg, &uart->port);
1259 static int bfin_serial_resume(struct platform_device *pdev)
1261 struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1263 return uart_resume_port(&bfin_serial_reg, &uart->port);
1266 static int bfin_serial_probe(struct platform_device *pdev)
1268 struct resource *res;
1269 struct bfin_serial_port *uart = NULL;
1272 if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
1273 dev_err(&pdev->dev, "Wrong bfin uart platform device id.\n");
1277 if (bfin_serial_ports[pdev->id] == NULL) {
1279 uart = kzalloc(sizeof(*uart), GFP_KERNEL);
1282 "fail to malloc bfin_serial_port\n");
1285 bfin_serial_ports[pdev->id] = uart;
1287 #ifdef CONFIG_EARLY_PRINTK
1288 if (!(bfin_earlyprintk_port.port.membase
1289 && bfin_earlyprintk_port.port.line == pdev->id)) {
1291 * If the peripheral PINs of current port is allocated
1292 * in earlyprintk probe stage, don't do it again.
1295 ret = peripheral_request_list(
1296 (unsigned short *)pdev->dev.platform_data, DRIVER_NAME);
1299 "fail to request bfin serial peripherals\n");
1300 goto out_error_free_mem;
1302 #ifdef CONFIG_EARLY_PRINTK
1306 spin_lock_init(&uart->port.lock);
1307 uart->port.uartclk = get_sclk();
1308 uart->port.fifosize = BFIN_UART_TX_FIFO_SIZE;
1309 uart->port.ops = &bfin_serial_pops;
1310 uart->port.line = pdev->id;
1311 uart->port.iotype = UPIO_MEM;
1312 uart->port.flags = UPF_BOOT_AUTOCONF;
1314 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1316 dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
1318 goto out_error_free_peripherals;
1321 uart->port.membase = ioremap(res->start, resource_size(res));
1322 if (!uart->port.membase) {
1323 dev_err(&pdev->dev, "Cannot map uart IO\n");
1325 goto out_error_free_peripherals;
1327 uart->port.mapbase = res->start;
1329 uart->tx_irq = platform_get_irq(pdev, 0);
1330 if (uart->tx_irq < 0) {
1331 dev_err(&pdev->dev, "No uart TX IRQ specified\n");
1333 goto out_error_unmap;
1336 uart->rx_irq = platform_get_irq(pdev, 1);
1337 if (uart->rx_irq < 0) {
1338 dev_err(&pdev->dev, "No uart RX IRQ specified\n");
1340 goto out_error_unmap;
1342 uart->port.irq = uart->rx_irq;
1344 uart->status_irq = platform_get_irq(pdev, 2);
1345 if (uart->status_irq < 0) {
1346 dev_err(&pdev->dev, "No uart status IRQ specified\n");
1348 goto out_error_unmap;
1351 #ifdef CONFIG_SERIAL_BFIN_DMA
1352 spin_lock_init(&uart->rx_lock);
1356 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
1358 dev_err(&pdev->dev, "No uart TX DMA channel specified\n");
1360 goto out_error_unmap;
1362 uart->tx_dma_channel = res->start;
1364 res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
1366 dev_err(&pdev->dev, "No uart RX DMA channel specified\n");
1368 goto out_error_unmap;
1370 uart->rx_dma_channel = res->start;
1372 init_timer(&(uart->rx_dma_timer));
1375 #if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
1376 defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
1377 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
1381 uart->cts_pin = res->start;
1382 uart->port.flags |= ASYNC_CTS_FLOW;
1385 res = platform_get_resource(pdev, IORESOURCE_IO, 1);
1389 uart->rts_pin = res->start;
1393 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1394 if (!is_early_platform_device(pdev)) {
1396 uart = bfin_serial_ports[pdev->id];
1397 uart->port.dev = &pdev->dev;
1398 dev_set_drvdata(&pdev->dev, uart);
1399 ret = uart_add_one_port(&bfin_serial_reg, &uart->port);
1400 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1409 iounmap(uart->port.membase);
1410 out_error_free_peripherals:
1411 peripheral_free_list(
1412 (unsigned short *)pdev->dev.platform_data);
1415 bfin_serial_ports[pdev->id] = NULL;
1421 static int __devexit bfin_serial_remove(struct platform_device *pdev)
1423 struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1425 dev_set_drvdata(&pdev->dev, NULL);
1428 uart_remove_one_port(&bfin_serial_reg, &uart->port);
1429 iounmap(uart->port.membase);
1430 peripheral_free_list(
1431 (unsigned short *)pdev->dev.platform_data);
1433 bfin_serial_ports[pdev->id] = NULL;
1439 static struct platform_driver bfin_serial_driver = {
1440 .probe = bfin_serial_probe,
1441 .remove = __devexit_p(bfin_serial_remove),
1442 .suspend = bfin_serial_suspend,
1443 .resume = bfin_serial_resume,
1445 .name = DRIVER_NAME,
1446 .owner = THIS_MODULE,
1450 #if defined(CONFIG_SERIAL_BFIN_CONSOLE)
1451 static __initdata struct early_platform_driver early_bfin_serial_driver = {
1452 .class_str = CLASS_BFIN_CONSOLE,
1453 .pdrv = &bfin_serial_driver,
1454 .requested_id = EARLY_PLATFORM_ID_UNSET,
1457 static int __init bfin_serial_rs_console_init(void)
1459 early_platform_driver_register(&early_bfin_serial_driver, DRIVER_NAME);
1461 early_platform_driver_probe(CLASS_BFIN_CONSOLE, BFIN_UART_NR_PORTS, 0);
1463 register_console(&bfin_serial_console);
1467 console_initcall(bfin_serial_rs_console_init);
1470 #ifdef CONFIG_EARLY_PRINTK
1472 * Memory can't be allocated dynamically during earlyprink init stage.
1473 * So, do individual probe for earlyprink with a static uart port variable.
1475 static int bfin_earlyprintk_probe(struct platform_device *pdev)
1477 struct resource *res;
1480 if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
1481 dev_err(&pdev->dev, "Wrong earlyprintk platform device id.\n");
1485 ret = peripheral_request_list(
1486 (unsigned short *)pdev->dev.platform_data, DRIVER_NAME);
1489 "fail to request bfin serial peripherals\n");
1493 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1495 dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
1497 goto out_error_free_peripherals;
1500 bfin_earlyprintk_port.port.membase = ioremap(res->start,
1501 resource_size(res));
1502 if (!bfin_earlyprintk_port.port.membase) {
1503 dev_err(&pdev->dev, "Cannot map uart IO\n");
1505 goto out_error_free_peripherals;
1507 bfin_earlyprintk_port.port.mapbase = res->start;
1508 bfin_earlyprintk_port.port.line = pdev->id;
1509 bfin_earlyprintk_port.port.uartclk = get_sclk();
1510 bfin_earlyprintk_port.port.fifosize = BFIN_UART_TX_FIFO_SIZE;
1511 spin_lock_init(&bfin_earlyprintk_port.port.lock);
1515 out_error_free_peripherals:
1516 peripheral_free_list(
1517 (unsigned short *)pdev->dev.platform_data);
1522 static struct platform_driver bfin_earlyprintk_driver = {
1523 .probe = bfin_earlyprintk_probe,
1525 .name = DRIVER_NAME,
1526 .owner = THIS_MODULE,
1530 static __initdata struct early_platform_driver early_bfin_earlyprintk_driver = {
1531 .class_str = CLASS_BFIN_EARLYPRINTK,
1532 .pdrv = &bfin_earlyprintk_driver,
1533 .requested_id = EARLY_PLATFORM_ID_UNSET,
1536 struct console __init *bfin_earlyserial_init(unsigned int port,
1542 if (port < 0 || port >= BFIN_UART_NR_PORTS)
1546 * Only probe resource of the given port in earlyprintk boot arg.
1547 * The expected port id should be indicated in port name string.
1549 snprintf(port_name, 20, DRIVER_NAME ".%d", port);
1550 early_platform_driver_register(&early_bfin_earlyprintk_driver,
1552 early_platform_driver_probe(CLASS_BFIN_EARLYPRINTK, 1, 0);
1554 if (!bfin_earlyprintk_port.port.membase)
1557 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1559 * If we are using early serial, don't let the normal console rewind
1560 * log buffer, since that causes things to be printed multiple times
1562 bfin_serial_console.flags &= ~CON_PRINTBUFFER;
1565 bfin_early_serial_console.index = port;
1571 bfin_serial_set_termios(&bfin_earlyprintk_port.port, &t, &t);
1573 return &bfin_early_serial_console;
1575 #endif /* CONFIG_EARLY_PRINTK */
1577 static int __init bfin_serial_init(void)
1581 pr_info("Blackfin serial driver\n");
1583 ret = uart_register_driver(&bfin_serial_reg);
1585 pr_err("failed to register %s:%d\n",
1586 bfin_serial_reg.driver_name, ret);
1589 ret = platform_driver_register(&bfin_serial_driver);
1591 pr_err("fail to register bfin uart\n");
1592 uart_unregister_driver(&bfin_serial_reg);
1598 static void __exit bfin_serial_exit(void)
1600 platform_driver_unregister(&bfin_serial_driver);
1601 uart_unregister_driver(&bfin_serial_reg);
1605 module_init(bfin_serial_init);
1606 module_exit(bfin_serial_exit);
1608 MODULE_AUTHOR("Sonic Zhang, Aubrey Li");
1609 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1610 MODULE_LICENSE("GPL");
1611 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);
1612 MODULE_ALIAS("platform:bfin-uart");