2 * File: drivers/serial/bfin_5xx.c
3 * Based on: Based on drivers/serial/sa1100.c
4 * Author: Aubrey Li <aubrey.li@analog.com>
7 * Description: Driver for blackfin 5xx serial ports
10 * Copyright 2006 Analog Devices Inc.
12 * Bugs: Enter bugs at http://blackfin.uclinux.org/
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, see the file COPYING, or write
26 * to the Free Software Foundation, Inc.,
27 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
30 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
34 #include <linux/module.h>
35 #include <linux/ioport.h>
36 #include <linux/init.h>
37 #include <linux/console.h>
38 #include <linux/sysrq.h>
39 #include <linux/platform_device.h>
40 #include <linux/tty.h>
41 #include <linux/tty_flip.h>
42 #include <linux/serial_core.h>
44 #ifdef CONFIG_KGDB_UART
45 #include <linux/kgdb.h>
46 #include <asm/irq_regs.h>
50 #include <asm/mach/bfin_serial_5xx.h>
52 #ifdef CONFIG_SERIAL_BFIN_DMA
53 #include <linux/dma-mapping.h>
56 #include <asm/cacheflush.h>
59 /* UART name and device definitions */
60 #define BFIN_SERIAL_NAME "ttyBF"
61 #define BFIN_SERIAL_MAJOR 204
62 #define BFIN_SERIAL_MINOR 64
65 * Setup for console. Argument comes from the menuconfig
67 #define DMA_RX_XCOUNT 512
68 #define DMA_RX_YCOUNT (PAGE_SIZE / DMA_RX_XCOUNT)
70 #define DMA_RX_FLUSH_JIFFIES 5
72 #ifdef CONFIG_SERIAL_BFIN_DMA
73 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart);
75 static void bfin_serial_do_work(struct work_struct *work);
76 static void bfin_serial_tx_chars(struct bfin_serial_port *uart);
79 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart);
82 * interrupts are disabled on entry
84 static void bfin_serial_stop_tx(struct uart_port *port)
86 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
87 #if !defined(CONFIG_BF54x) && !defined(CONFIG_SERIAL_BFIN_DMA)
91 while (!(UART_GET_LSR(uart) & TEMT))
94 #ifdef CONFIG_SERIAL_BFIN_DMA
95 disable_dma(uart->tx_dma_channel);
99 UART_PUT_LSR(uart, TFI);
100 UART_CLEAR_IER(uart, ETBEI);
102 ier = UART_GET_IER(uart);
104 UART_PUT_IER(uart, ier);
110 * port is locked and interrupts are disabled
112 static void bfin_serial_start_tx(struct uart_port *port)
114 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
116 #ifdef CONFIG_SERIAL_BFIN_DMA
117 bfin_serial_dma_tx_chars(uart);
120 UART_SET_IER(uart, ETBEI);
123 ier = UART_GET_IER(uart);
125 UART_PUT_IER(uart, ier);
127 bfin_serial_tx_chars(uart);
132 * Interrupts are enabled
134 static void bfin_serial_stop_rx(struct uart_port *port)
136 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
137 #ifdef CONFIG_KGDB_UART
138 if (uart->port.line != CONFIG_KGDB_UART_PORT) {
141 UART_CLEAR_IER(uart, ERBFI);
145 ier = UART_GET_IER(uart);
147 UART_PUT_IER(uart, ier);
149 #ifdef CONFIG_KGDB_UART
155 * Set the modem control timer to fire immediately.
157 static void bfin_serial_enable_ms(struct uart_port *port)
161 #ifdef CONFIG_KGDB_UART
162 static int kgdb_entry_state;
164 void kgdb_put_debug_char(int chr)
166 struct bfin_serial_port *uart;
168 if (CONFIG_KGDB_UART_PORT<0 || CONFIG_KGDB_UART_PORT>=NR_PORTS)
169 uart = &bfin_serial_ports[0];
171 uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
173 while (!(UART_GET_LSR(uart) & THRE)) {
178 UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB));
181 UART_PUT_CHAR(uart, (unsigned char)chr);
185 int kgdb_get_debug_char(void)
187 struct bfin_serial_port *uart;
190 if (CONFIG_KGDB_UART_PORT<0 || CONFIG_KGDB_UART_PORT>=NR_PORTS)
191 uart = &bfin_serial_ports[0];
193 uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
195 while(!(UART_GET_LSR(uart) & DR)) {
199 UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB));
202 chr = UART_GET_CHAR(uart);
209 #if ANOMALY_05000230 && defined(CONFIG_SERIAL_BFIN_PIO)
210 # define UART_GET_ANOMALY_THRESHOLD(uart) ((uart)->anomaly_threshold)
211 # define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v))
213 # define UART_GET_ANOMALY_THRESHOLD(uart) 0
214 # define UART_SET_ANOMALY_THRESHOLD(uart, v)
217 #ifdef CONFIG_SERIAL_BFIN_PIO
218 static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
220 struct tty_struct *tty = uart->port.info->tty;
221 unsigned int status, ch, flg;
222 static struct timeval anomaly_start = { .tv_sec = 0 };
223 #ifdef CONFIG_KGDB_UART
224 struct pt_regs *regs = get_irq_regs();
227 status = UART_GET_LSR(uart);
228 UART_CLEAR_LSR(uart);
230 ch = UART_GET_CHAR(uart);
231 uart->port.icount.rx++;
233 #ifdef CONFIG_KGDB_UART
234 if (uart->port.line == CONFIG_KGDB_UART_PORT) {
235 if (uart->port.cons->index == CONFIG_KGDB_UART_PORT && ch == 0x1) { /* Ctrl + A */
236 kgdb_breakkey_pressed(regs);
238 } else if (kgdb_entry_state == 0 && ch == '$') {/* connection from KGDB */
239 kgdb_entry_state = 1;
240 } else if (kgdb_entry_state == 1 && ch == 'q') {
241 kgdb_entry_state = 0;
242 kgdb_breakkey_pressed(regs);
244 } else if (ch == 0x3) {/* Ctrl + C */
245 kgdb_entry_state = 0;
246 kgdb_breakkey_pressed(regs);
249 kgdb_entry_state = 0;
254 if (ANOMALY_05000230) {
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.
266 * Note: While Anomaly 05000230 does not directly address this,
267 * the changes that went in for it also fixed this issue.
268 * That anomaly was fixed in 0.5+ silicon. I like bunnies.
270 if (anomaly_start.tv_sec) {
274 if ((~ch & (~ch + 1)) & 0xff)
275 goto known_good_char;
277 do_gettimeofday(&curr);
278 if (curr.tv_sec - anomaly_start.tv_sec > 1)
279 goto known_good_char;
282 if (curr.tv_sec != anomaly_start.tv_sec)
283 usecs += USEC_PER_SEC;
284 usecs += curr.tv_usec - anomaly_start.tv_usec;
286 if (usecs > UART_GET_ANOMALY_THRESHOLD(uart))
287 goto known_good_char;
290 anomaly_start.tv_sec = 0;
292 anomaly_start = curr;
297 anomaly_start.tv_sec = 0;
302 if (ANOMALY_05000230)
303 if (bfin_revid() < 5)
304 do_gettimeofday(&anomaly_start);
305 uart->port.icount.brk++;
306 if (uart_handle_break(&uart->port))
308 status &= ~(PE | FE);
311 uart->port.icount.parity++;
313 uart->port.icount.overrun++;
315 uart->port.icount.frame++;
317 status &= uart->port.read_status_mask;
321 else if (status & PE)
323 else if (status & FE)
328 if (uart_handle_sysrq_char(&uart->port, ch))
331 uart_insert_char(&uart->port, status, OE, ch, flg);
334 tty_flip_buffer_push(tty);
337 static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
339 struct circ_buf *xmit = &uart->port.info->xmit;
341 if (uart->port.x_char) {
342 UART_PUT_CHAR(uart, uart->port.x_char);
343 uart->port.icount.tx++;
344 uart->port.x_char = 0;
347 * Check the modem control lines before
348 * transmitting anything.
350 bfin_serial_mctrl_check(uart);
352 if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
353 bfin_serial_stop_tx(&uart->port);
357 while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
358 UART_PUT_CHAR(uart, xmit->buf[xmit->tail]);
359 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
360 uart->port.icount.tx++;
364 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
365 uart_write_wakeup(&uart->port);
367 if (uart_circ_empty(xmit))
368 bfin_serial_stop_tx(&uart->port);
371 static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
373 struct bfin_serial_port *uart = dev_id;
375 spin_lock(&uart->port.lock);
376 while (UART_GET_LSR(uart) & DR)
377 bfin_serial_rx_chars(uart);
378 spin_unlock(&uart->port.lock);
383 static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
385 struct bfin_serial_port *uart = dev_id;
387 spin_lock(&uart->port.lock);
388 if (UART_GET_LSR(uart) & THRE)
389 bfin_serial_tx_chars(uart);
390 spin_unlock(&uart->port.lock);
396 static void bfin_serial_do_work(struct work_struct *work)
398 struct bfin_serial_port *uart = container_of(work, struct bfin_serial_port, cts_workqueue);
400 bfin_serial_mctrl_check(uart);
404 #ifdef CONFIG_SERIAL_BFIN_DMA
405 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
407 struct circ_buf *xmit = &uart->port.info->xmit;
415 if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
416 bfin_serial_stop_tx(&uart->port);
421 if (uart->port.x_char) {
422 UART_PUT_CHAR(uart, uart->port.x_char);
423 uart->port.icount.tx++;
424 uart->port.x_char = 0;
428 * Check the modem control lines before
429 * transmitting anything.
431 bfin_serial_mctrl_check(uart);
433 spin_lock_irqsave(&uart->port.lock, flags);
434 uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
435 if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
436 uart->tx_count = UART_XMIT_SIZE - xmit->tail;
437 blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
438 (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
439 set_dma_config(uart->tx_dma_channel,
440 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
445 set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
446 set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
447 set_dma_x_modify(uart->tx_dma_channel, 1);
448 enable_dma(uart->tx_dma_channel);
450 xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
451 uart->port.icount.tx += uart->tx_count;
454 UART_SET_IER(uart, ETBEI);
456 ier = UART_GET_IER(uart);
458 UART_PUT_IER(uart, ier);
460 spin_unlock_irqrestore(&uart->port.lock, flags);
463 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
465 struct tty_struct *tty = uart->port.info->tty;
468 status = UART_GET_LSR(uart);
469 UART_CLEAR_LSR(uart);
471 uart->port.icount.rx += CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail, UART_XMIT_SIZE);;
474 uart->port.icount.brk++;
475 if (uart_handle_break(&uart->port))
476 goto dma_ignore_char;
477 status &= ~(PE | FE);
480 uart->port.icount.parity++;
482 uart->port.icount.overrun++;
484 uart->port.icount.frame++;
486 status &= uart->port.read_status_mask;
490 else if (status & PE)
492 else if (status & FE)
497 for (i = uart->rx_dma_buf.head; i < uart->rx_dma_buf.tail; i++) {
498 if (uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
499 goto dma_ignore_char;
500 uart_insert_char(&uart->port, status, OE, uart->rx_dma_buf.buf[i], flg);
504 tty_flip_buffer_push(tty);
507 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
512 spin_lock_irqsave(&uart->port.lock, flags);
513 x_pos = DMA_RX_XCOUNT - get_dma_curr_xcount(uart->rx_dma_channel);
514 if (x_pos == DMA_RX_XCOUNT)
517 pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
519 if (pos>uart->rx_dma_buf.tail) {
520 uart->rx_dma_buf.tail = pos;
521 bfin_serial_dma_rx_chars(uart);
522 uart->rx_dma_buf.head = uart->rx_dma_buf.tail;
524 spin_unlock_irqrestore(&uart->port.lock, flags);
525 uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
526 add_timer(&(uart->rx_dma_timer));
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.info->xmit;
535 spin_lock(&uart->port.lock);
536 if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
537 clear_dma_irqstat(uart->tx_dma_channel);
538 disable_dma(uart->tx_dma_channel);
540 UART_CLEAR_IER(uart, ETBEI);
542 ier = UART_GET_IER(uart);
544 UART_PUT_IER(uart, ier);
546 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
547 uart_write_wakeup(&uart->port);
551 bfin_serial_dma_tx_chars(uart);
554 spin_unlock(&uart->port.lock);
558 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
560 struct bfin_serial_port *uart = dev_id;
561 unsigned short irqstat;
563 uart->rx_dma_nrows++;
564 if (uart->rx_dma_nrows == DMA_RX_YCOUNT) {
565 uart->rx_dma_nrows = 0;
566 uart->rx_dma_buf.tail = DMA_RX_XCOUNT*DMA_RX_YCOUNT;
567 bfin_serial_dma_rx_chars(uart);
568 uart->rx_dma_buf.head = uart->rx_dma_buf.tail = 0;
570 spin_lock(&uart->port.lock);
571 irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
572 clear_dma_irqstat(uart->rx_dma_channel);
574 spin_unlock(&uart->port.lock);
580 * Return TIOCSER_TEMT when transmitter is not busy.
582 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
584 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
587 lsr = UART_GET_LSR(uart);
594 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
596 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
597 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
598 if (uart->cts_pin < 0)
599 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
601 if (gpio_get_value(uart->cts_pin))
602 return TIOCM_DSR | TIOCM_CAR;
605 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
608 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
610 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
611 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
612 if (uart->rts_pin < 0)
615 if (mctrl & TIOCM_RTS)
616 gpio_set_value(uart->rts_pin, 0);
618 gpio_set_value(uart->rts_pin, 1);
623 * Handle any change of modem status signal since we were last called.
625 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart)
627 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
629 # ifdef CONFIG_SERIAL_BFIN_DMA
630 struct uart_info *info = uart->port.info;
631 struct tty_struct *tty = info->tty;
633 status = bfin_serial_get_mctrl(&uart->port);
634 if (!(status & TIOCM_CTS)) {
640 status = bfin_serial_get_mctrl(&uart->port);
641 uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
642 if (!(status & TIOCM_CTS))
643 schedule_work(&uart->cts_workqueue);
649 * Interrupts are always disabled.
651 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
653 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
654 u16 lcr = UART_GET_LCR(uart);
659 UART_PUT_LCR(uart, lcr);
663 static int bfin_serial_startup(struct uart_port *port)
665 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
667 #ifdef CONFIG_SERIAL_BFIN_DMA
668 dma_addr_t dma_handle;
670 if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
671 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
675 if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
676 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
677 free_dma(uart->rx_dma_channel);
681 set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
682 set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
684 uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
685 uart->rx_dma_buf.head = 0;
686 uart->rx_dma_buf.tail = 0;
687 uart->rx_dma_nrows = 0;
689 set_dma_config(uart->rx_dma_channel,
690 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
691 INTR_ON_ROW, DIMENSION_2D,
694 set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
695 set_dma_x_modify(uart->rx_dma_channel, 1);
696 set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
697 set_dma_y_modify(uart->rx_dma_channel, 1);
698 set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
699 enable_dma(uart->rx_dma_channel);
701 uart->rx_dma_timer.data = (unsigned long)(uart);
702 uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
703 uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
704 add_timer(&(uart->rx_dma_timer));
706 if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
707 "BFIN_UART_RX", uart)) {
708 # ifdef CONFIG_KGDB_UART
709 if (uart->port.line != CONFIG_KGDB_UART_PORT) {
711 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
713 # ifdef CONFIG_KGDB_UART
720 (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED,
721 "BFIN_UART_TX", uart)) {
722 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
723 free_irq(uart->port.irq, uart);
728 UART_SET_IER(uart, ERBFI);
730 UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
735 static void bfin_serial_shutdown(struct uart_port *port)
737 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
739 #ifdef CONFIG_SERIAL_BFIN_DMA
740 disable_dma(uart->tx_dma_channel);
741 free_dma(uart->tx_dma_channel);
742 disable_dma(uart->rx_dma_channel);
743 free_dma(uart->rx_dma_channel);
744 del_timer(&(uart->rx_dma_timer));
745 dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
747 #ifdef CONFIG_KGDB_UART
748 if (uart->port.line != CONFIG_KGDB_UART_PORT)
750 free_irq(uart->port.irq, uart);
751 free_irq(uart->port.irq+1, uart);
756 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
757 struct ktermios *old)
759 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
761 unsigned int baud, quot;
762 unsigned short val, ier, lsr, lcr = 0;
764 switch (termios->c_cflag & CSIZE) {
778 printk(KERN_ERR "%s: word lengh not supported\n",
782 if (termios->c_cflag & CSTOPB)
784 if (termios->c_cflag & PARENB)
786 if (!(termios->c_cflag & PARODD))
788 if (termios->c_cflag & CMSPAR)
791 port->read_status_mask = OE;
792 if (termios->c_iflag & INPCK)
793 port->read_status_mask |= (FE | PE);
794 if (termios->c_iflag & (BRKINT | PARMRK))
795 port->read_status_mask |= BI;
798 * Characters to ignore
800 port->ignore_status_mask = 0;
801 if (termios->c_iflag & IGNPAR)
802 port->ignore_status_mask |= FE | PE;
803 if (termios->c_iflag & IGNBRK) {
804 port->ignore_status_mask |= BI;
806 * If we're ignoring parity and break indicators,
807 * ignore overruns too (for real raw support).
809 if (termios->c_iflag & IGNPAR)
810 port->ignore_status_mask |= OE;
813 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
814 quot = uart_get_divisor(port, baud);
815 spin_lock_irqsave(&uart->port.lock, flags);
817 UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
820 lsr = UART_GET_LSR(uart);
821 } while (!(lsr & TEMT));
824 ier = UART_GET_IER(uart);
826 UART_CLEAR_IER(uart, 0xF);
828 UART_PUT_IER(uart, 0);
832 /* Set DLAB in LCR to Access DLL and DLH */
833 val = UART_GET_LCR(uart);
835 UART_PUT_LCR(uart, val);
839 UART_PUT_DLL(uart, quot & 0xFF);
841 UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
845 /* Clear DLAB in LCR to Access THR RBR IER */
846 val = UART_GET_LCR(uart);
848 UART_PUT_LCR(uart, val);
852 UART_PUT_LCR(uart, lcr);
856 UART_SET_IER(uart, ier);
858 UART_PUT_IER(uart, ier);
861 val = UART_GET_GCTL(uart);
863 UART_PUT_GCTL(uart, val);
865 spin_unlock_irqrestore(&uart->port.lock, flags);
868 static const char *bfin_serial_type(struct uart_port *port)
870 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
872 return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
876 * Release the memory region(s) being used by 'port'.
878 static void bfin_serial_release_port(struct uart_port *port)
883 * Request the memory region(s) being used by 'port'.
885 static int bfin_serial_request_port(struct uart_port *port)
891 * Configure/autoconfigure the port.
893 static void bfin_serial_config_port(struct uart_port *port, int flags)
895 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
897 if (flags & UART_CONFIG_TYPE &&
898 bfin_serial_request_port(&uart->port) == 0)
899 uart->port.type = PORT_BFIN;
903 * Verify the new serial_struct (for TIOCSSERIAL).
904 * The only change we allow are to the flags and type, and
905 * even then only between PORT_BFIN and PORT_UNKNOWN
908 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
913 static struct uart_ops bfin_serial_pops = {
914 .tx_empty = bfin_serial_tx_empty,
915 .set_mctrl = bfin_serial_set_mctrl,
916 .get_mctrl = bfin_serial_get_mctrl,
917 .stop_tx = bfin_serial_stop_tx,
918 .start_tx = bfin_serial_start_tx,
919 .stop_rx = bfin_serial_stop_rx,
920 .enable_ms = bfin_serial_enable_ms,
921 .break_ctl = bfin_serial_break_ctl,
922 .startup = bfin_serial_startup,
923 .shutdown = bfin_serial_shutdown,
924 .set_termios = bfin_serial_set_termios,
925 .type = bfin_serial_type,
926 .release_port = bfin_serial_release_port,
927 .request_port = bfin_serial_request_port,
928 .config_port = bfin_serial_config_port,
929 .verify_port = bfin_serial_verify_port,
932 static void __init bfin_serial_init_ports(void)
934 static int first = 1;
941 for (i = 0; i < nr_ports; i++) {
942 bfin_serial_ports[i].port.uartclk = get_sclk();
943 bfin_serial_ports[i].port.ops = &bfin_serial_pops;
944 bfin_serial_ports[i].port.line = i;
945 bfin_serial_ports[i].port.iotype = UPIO_MEM;
946 bfin_serial_ports[i].port.membase =
947 (void __iomem *)bfin_serial_resource[i].uart_base_addr;
948 bfin_serial_ports[i].port.mapbase =
949 bfin_serial_resource[i].uart_base_addr;
950 bfin_serial_ports[i].port.irq =
951 bfin_serial_resource[i].uart_irq;
952 bfin_serial_ports[i].port.flags = UPF_BOOT_AUTOCONF;
953 #ifdef CONFIG_SERIAL_BFIN_DMA
954 bfin_serial_ports[i].tx_done = 1;
955 bfin_serial_ports[i].tx_count = 0;
956 bfin_serial_ports[i].tx_dma_channel =
957 bfin_serial_resource[i].uart_tx_dma_channel;
958 bfin_serial_ports[i].rx_dma_channel =
959 bfin_serial_resource[i].uart_rx_dma_channel;
960 init_timer(&(bfin_serial_ports[i].rx_dma_timer));
962 INIT_WORK(&bfin_serial_ports[i].cts_workqueue, bfin_serial_do_work);
964 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
965 bfin_serial_ports[i].cts_pin =
966 bfin_serial_resource[i].uart_cts_pin;
967 bfin_serial_ports[i].rts_pin =
968 bfin_serial_resource[i].uart_rts_pin;
970 bfin_serial_hw_init(&bfin_serial_ports[i]);
975 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
977 * If the port was already initialised (eg, by a boot loader),
978 * try to determine the current setup.
981 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
982 int *parity, int *bits)
984 unsigned short status;
986 status = UART_GET_IER(uart) & (ERBFI | ETBEI);
987 if (status == (ERBFI | ETBEI)) {
988 /* ok, the port was enabled */
989 unsigned short lcr, val;
990 unsigned short dlh, dll;
992 lcr = UART_GET_LCR(uart);
1001 switch (lcr & 0x03) {
1002 case 0: *bits = 5; break;
1003 case 1: *bits = 6; break;
1004 case 2: *bits = 7; break;
1005 case 3: *bits = 8; break;
1007 #ifndef CONFIG_BF54x
1008 /* Set DLAB in LCR to Access DLL and DLH */
1009 val = UART_GET_LCR(uart);
1011 UART_PUT_LCR(uart, val);
1014 dll = UART_GET_DLL(uart);
1015 dlh = UART_GET_DLH(uart);
1017 #ifndef CONFIG_BF54x
1018 /* Clear DLAB in LCR to Access THR RBR IER */
1019 val = UART_GET_LCR(uart);
1021 UART_PUT_LCR(uart, val);
1024 *baud = get_sclk() / (16*(dll | dlh << 8));
1026 pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __FUNCTION__, *baud, *parity, *bits);
1030 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
1031 static struct uart_driver bfin_serial_reg;
1034 bfin_serial_console_setup(struct console *co, char *options)
1036 struct bfin_serial_port *uart;
1037 # ifdef CONFIG_SERIAL_BFIN_CONSOLE
1041 # ifdef CONFIG_SERIAL_BFIN_CTSRTS
1049 * Check whether an invalid uart number has been specified, and
1050 * if so, search for the first available port that does have
1053 if (co->index == -1 || co->index >= nr_ports)
1055 uart = &bfin_serial_ports[co->index];
1057 # ifdef CONFIG_SERIAL_BFIN_CONSOLE
1059 uart_parse_options(options, &baud, &parity, &bits, &flow);
1061 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1063 return uart_set_options(&uart->port, co, baud, parity, bits, flow);
1068 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1069 defined (CONFIG_EARLY_PRINTK) */
1071 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1072 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1074 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1075 while (!(UART_GET_LSR(uart) & THRE))
1077 UART_PUT_CHAR(uart, ch);
1082 * Interrupts are disabled on entering
1085 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1087 struct bfin_serial_port *uart = &bfin_serial_ports[co->index];
1090 spin_lock_irqsave(&uart->port.lock, flags);
1091 uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1092 spin_unlock_irqrestore(&uart->port.lock, flags);
1096 static struct console bfin_serial_console = {
1097 .name = BFIN_SERIAL_NAME,
1098 .write = bfin_serial_console_write,
1099 .device = uart_console_device,
1100 .setup = bfin_serial_console_setup,
1101 .flags = CON_PRINTBUFFER,
1103 .data = &bfin_serial_reg,
1106 static int __init bfin_serial_rs_console_init(void)
1108 bfin_serial_init_ports();
1109 register_console(&bfin_serial_console);
1110 #ifdef CONFIG_KGDB_UART
1111 kgdb_entry_state = 0;
1116 console_initcall(bfin_serial_rs_console_init);
1118 #define BFIN_SERIAL_CONSOLE &bfin_serial_console
1120 #define BFIN_SERIAL_CONSOLE NULL
1121 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1124 #ifdef CONFIG_EARLY_PRINTK
1125 static __init void early_serial_putc(struct uart_port *port, int ch)
1127 unsigned timeout = 0xffff;
1128 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1130 while ((!(UART_GET_LSR(uart) & THRE)) && --timeout)
1132 UART_PUT_CHAR(uart, ch);
1135 static __init void early_serial_write(struct console *con, const char *s,
1138 struct bfin_serial_port *uart = &bfin_serial_ports[con->index];
1141 for (i = 0; i < n; i++, s++) {
1143 early_serial_putc(&uart->port, '\r');
1144 early_serial_putc(&uart->port, *s);
1148 static struct __init console bfin_early_serial_console = {
1149 .name = "early_BFuart",
1150 .write = early_serial_write,
1151 .device = uart_console_device,
1152 .flags = CON_PRINTBUFFER,
1153 .setup = bfin_serial_console_setup,
1155 .data = &bfin_serial_reg,
1158 struct console __init *bfin_earlyserial_init(unsigned int port,
1161 struct bfin_serial_port *uart;
1164 if (port == -1 || port >= nr_ports)
1166 bfin_serial_init_ports();
1167 bfin_early_serial_console.index = port;
1168 uart = &bfin_serial_ports[port];
1174 bfin_serial_set_termios(&uart->port, &t, &t);
1175 return &bfin_early_serial_console;
1178 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1180 static struct uart_driver bfin_serial_reg = {
1181 .owner = THIS_MODULE,
1182 .driver_name = "bfin-uart",
1183 .dev_name = BFIN_SERIAL_NAME,
1184 .major = BFIN_SERIAL_MAJOR,
1185 .minor = BFIN_SERIAL_MINOR,
1187 .cons = BFIN_SERIAL_CONSOLE,
1190 static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state)
1192 struct bfin_serial_port *uart = platform_get_drvdata(dev);
1195 uart_suspend_port(&bfin_serial_reg, &uart->port);
1200 static int bfin_serial_resume(struct platform_device *dev)
1202 struct bfin_serial_port *uart = platform_get_drvdata(dev);
1205 uart_resume_port(&bfin_serial_reg, &uart->port);
1210 static int bfin_serial_probe(struct platform_device *dev)
1212 struct resource *res = dev->resource;
1215 for (i = 0; i < dev->num_resources; i++, res++)
1216 if (res->flags & IORESOURCE_MEM)
1219 if (i < dev->num_resources) {
1220 for (i = 0; i < nr_ports; i++, res++) {
1221 if (bfin_serial_ports[i].port.mapbase != res->start)
1223 bfin_serial_ports[i].port.dev = &dev->dev;
1224 uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1225 platform_set_drvdata(dev, &bfin_serial_ports[i]);
1232 static int bfin_serial_remove(struct platform_device *pdev)
1234 struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1237 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
1238 gpio_free(uart->cts_pin);
1239 gpio_free(uart->rts_pin);
1242 platform_set_drvdata(pdev, NULL);
1245 uart_remove_one_port(&bfin_serial_reg, &uart->port);
1250 static struct platform_driver bfin_serial_driver = {
1251 .probe = bfin_serial_probe,
1252 .remove = bfin_serial_remove,
1253 .suspend = bfin_serial_suspend,
1254 .resume = bfin_serial_resume,
1256 .name = "bfin-uart",
1260 static int __init bfin_serial_init(void)
1263 #ifdef CONFIG_KGDB_UART
1264 struct bfin_serial_port *uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
1268 pr_info("Serial: Blackfin serial driver\n");
1270 bfin_serial_init_ports();
1272 ret = uart_register_driver(&bfin_serial_reg);
1274 ret = platform_driver_register(&bfin_serial_driver);
1276 pr_debug("uart register failed\n");
1277 uart_unregister_driver(&bfin_serial_reg);
1280 #ifdef CONFIG_KGDB_UART
1281 if (uart->port.cons->index != CONFIG_KGDB_UART_PORT) {
1282 request_irq(uart->port.irq, bfin_serial_rx_int,
1283 IRQF_DISABLED, "BFIN_UART_RX", uart);
1284 pr_info("Request irq for kgdb uart port\n");
1286 UART_SET_IER(uart, ERBFI);
1288 UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
1291 t.c_cflag = CS8|B57600;
1295 t.c_line = CONFIG_KGDB_UART_PORT;
1296 bfin_serial_set_termios(&uart->port, &t, &t);
1302 static void __exit bfin_serial_exit(void)
1304 platform_driver_unregister(&bfin_serial_driver);
1305 uart_unregister_driver(&bfin_serial_reg);
1308 module_init(bfin_serial_init);
1309 module_exit(bfin_serial_exit);
1311 MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>");
1312 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1313 MODULE_LICENSE("GPL");
1314 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);