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);
98 /* Waiting for Transmission Finished */
99 while (!(UART_GET_LSR(uart) & TFI))
102 UART_PUT_LSR(uart, TFI);
103 UART_CLEAR_IER(uart, ETBEI);
105 ier = UART_GET_IER(uart);
107 UART_PUT_IER(uart, ier);
113 * port is locked and interrupts are disabled
115 static void bfin_serial_start_tx(struct uart_port *port)
117 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
119 #ifdef CONFIG_SERIAL_BFIN_DMA
120 bfin_serial_dma_tx_chars(uart);
123 UART_SET_IER(uart, ETBEI);
126 ier = UART_GET_IER(uart);
128 UART_PUT_IER(uart, ier);
130 bfin_serial_tx_chars(uart);
135 * Interrupts are enabled
137 static void bfin_serial_stop_rx(struct uart_port *port)
139 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
140 #ifdef CONFIG_KGDB_UART
141 if (uart->port.line != CONFIG_KGDB_UART_PORT) {
144 UART_CLEAR_IER(uart, ERBFI);
148 ier = UART_GET_IER(uart);
150 UART_PUT_IER(uart, ier);
152 #ifdef CONFIG_KGDB_UART
158 * Set the modem control timer to fire immediately.
160 static void bfin_serial_enable_ms(struct uart_port *port)
164 #ifdef CONFIG_KGDB_UART
165 static int kgdb_entry_state;
167 void kgdb_put_debug_char(int chr)
169 struct bfin_serial_port *uart;
171 if (CONFIG_KGDB_UART_PORT<0 || CONFIG_KGDB_UART_PORT>=NR_PORTS)
172 uart = &bfin_serial_ports[0];
174 uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
176 while (!(UART_GET_LSR(uart) & THRE)) {
181 UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB));
184 UART_PUT_CHAR(uart, (unsigned char)chr);
188 int kgdb_get_debug_char(void)
190 struct bfin_serial_port *uart;
193 if (CONFIG_KGDB_UART_PORT<0 || CONFIG_KGDB_UART_PORT>=NR_PORTS)
194 uart = &bfin_serial_ports[0];
196 uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
198 while(!(UART_GET_LSR(uart) & DR)) {
202 UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB));
205 chr = UART_GET_CHAR(uart);
212 #ifdef CONFIG_SERIAL_BFIN_PIO
213 static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
215 struct tty_struct *tty = uart->port.info->tty;
216 unsigned int status, ch, flg;
217 static int in_break = 0;
218 #ifdef CONFIG_KGDB_UART
219 struct pt_regs *regs = get_irq_regs();
222 ch = UART_GET_CHAR(uart);
223 status = UART_GET_LSR(uart);
224 uart->port.icount.rx++;
226 #ifdef CONFIG_KGDB_UART
227 if (uart->port.line == CONFIG_KGDB_UART_PORT) {
228 if (uart->port.cons->index == CONFIG_KGDB_UART_PORT && ch == 0x1) { /* Ctrl + A */
229 kgdb_breakkey_pressed(regs);
231 } else if (kgdb_entry_state == 0 && ch == '$') {/* connection from KGDB */
232 kgdb_entry_state = 1;
233 } else if (kgdb_entry_state == 1 && ch == 'q') {
234 kgdb_entry_state = 0;
235 kgdb_breakkey_pressed(regs);
237 } else if (ch == 0x3) {/* Ctrl + C */
238 kgdb_entry_state = 0;
239 kgdb_breakkey_pressed(regs);
242 kgdb_entry_state = 0;
247 if (ANOMALY_05000230) {
248 /* The BF533 family of processors have a nice misbehavior where
249 * they continuously generate characters for a "single" break.
250 * We have to basically ignore this flood until the "next" valid
251 * character comes across. All other Blackfin families operate
253 * Note: While Anomaly 05000230 does not directly address this,
254 * the changes that went in for it also fixed this issue.
259 ch = UART_GET_CHAR(uart);
260 if (bfin_revid() < 5)
268 if (ANOMALY_05000230)
270 uart->port.icount.brk++;
271 if (uart_handle_break(&uart->port))
273 status &= ~(PE | FE);
276 uart->port.icount.parity++;
278 uart->port.icount.overrun++;
280 uart->port.icount.frame++;
282 status &= uart->port.read_status_mask;
286 else if (status & PE)
288 else if (status & FE)
293 if (uart_handle_sysrq_char(&uart->port, ch))
296 uart_insert_char(&uart->port, status, OE, ch, flg);
299 tty_flip_buffer_push(tty);
302 static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
304 struct circ_buf *xmit = &uart->port.info->xmit;
306 if (uart->port.x_char) {
307 UART_PUT_CHAR(uart, uart->port.x_char);
308 uart->port.icount.tx++;
309 uart->port.x_char = 0;
312 * Check the modem control lines before
313 * transmitting anything.
315 bfin_serial_mctrl_check(uart);
317 if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
318 bfin_serial_stop_tx(&uart->port);
322 while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
323 UART_PUT_CHAR(uart, xmit->buf[xmit->tail]);
324 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
325 uart->port.icount.tx++;
329 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
330 uart_write_wakeup(&uart->port);
332 if (uart_circ_empty(xmit))
333 bfin_serial_stop_tx(&uart->port);
336 static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
338 struct bfin_serial_port *uart = dev_id;
340 spin_lock(&uart->port.lock);
341 while ((UART_GET_IER(uart) & ERBFI) && (UART_GET_LSR(uart) & DR))
342 bfin_serial_rx_chars(uart);
343 spin_unlock(&uart->port.lock);
348 static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
350 struct bfin_serial_port *uart = dev_id;
352 spin_lock(&uart->port.lock);
353 if ((UART_GET_IER(uart) & ETBEI) && (UART_GET_LSR(uart) & THRE))
354 bfin_serial_tx_chars(uart);
355 spin_unlock(&uart->port.lock);
361 static void bfin_serial_do_work(struct work_struct *work)
363 struct bfin_serial_port *uart = container_of(work, struct bfin_serial_port, cts_workqueue);
365 bfin_serial_mctrl_check(uart);
369 #ifdef CONFIG_SERIAL_BFIN_DMA
370 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
372 struct circ_buf *xmit = &uart->port.info->xmit;
380 if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
381 bfin_serial_stop_tx(&uart->port);
386 if (uart->port.x_char) {
387 UART_PUT_CHAR(uart, uart->port.x_char);
388 uart->port.icount.tx++;
389 uart->port.x_char = 0;
393 * Check the modem control lines before
394 * transmitting anything.
396 bfin_serial_mctrl_check(uart);
398 spin_lock_irqsave(&uart->port.lock, flags);
399 uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
400 if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
401 uart->tx_count = UART_XMIT_SIZE - xmit->tail;
402 blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
403 (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
404 set_dma_config(uart->tx_dma_channel,
405 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
410 set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
411 set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
412 set_dma_x_modify(uart->tx_dma_channel, 1);
413 enable_dma(uart->tx_dma_channel);
415 xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
416 uart->port.icount.tx += uart->tx_count;
419 UART_SET_IER(uart, ETBEI);
421 ier = UART_GET_IER(uart);
423 UART_PUT_IER(uart, ier);
425 spin_unlock_irqrestore(&uart->port.lock, flags);
428 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
430 struct tty_struct *tty = uart->port.info->tty;
433 status = UART_GET_LSR(uart);
434 uart->port.icount.rx += CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail, UART_XMIT_SIZE);;
437 uart->port.icount.brk++;
438 if (uart_handle_break(&uart->port))
439 goto dma_ignore_char;
440 status &= ~(PE | FE);
443 uart->port.icount.parity++;
445 uart->port.icount.overrun++;
447 uart->port.icount.frame++;
449 status &= uart->port.read_status_mask;
453 else if (status & PE)
455 else if (status & FE)
460 for (i = uart->rx_dma_buf.head; i < uart->rx_dma_buf.tail; i++) {
461 if (uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
462 goto dma_ignore_char;
463 uart_insert_char(&uart->port, status, OE, uart->rx_dma_buf.buf[i], flg);
467 tty_flip_buffer_push(tty);
470 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
475 spin_lock_irqsave(&uart->port.lock, flags);
476 x_pos = DMA_RX_XCOUNT - get_dma_curr_xcount(uart->rx_dma_channel);
477 if (x_pos == DMA_RX_XCOUNT)
480 pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
482 if (pos>uart->rx_dma_buf.tail) {
483 uart->rx_dma_buf.tail = pos;
484 bfin_serial_dma_rx_chars(uart);
485 uart->rx_dma_buf.head = uart->rx_dma_buf.tail;
487 spin_unlock_irqrestore(&uart->port.lock, flags);
488 uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
489 add_timer(&(uart->rx_dma_timer));
492 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
494 struct bfin_serial_port *uart = dev_id;
495 struct circ_buf *xmit = &uart->port.info->xmit;
498 spin_lock(&uart->port.lock);
499 if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
500 clear_dma_irqstat(uart->tx_dma_channel);
501 disable_dma(uart->tx_dma_channel);
503 UART_CLEAR_IER(uart, ETBEI);
505 ier = UART_GET_IER(uart);
507 UART_PUT_IER(uart, ier);
509 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
510 uart_write_wakeup(&uart->port);
514 bfin_serial_dma_tx_chars(uart);
517 spin_unlock(&uart->port.lock);
521 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
523 struct bfin_serial_port *uart = dev_id;
524 unsigned short irqstat;
526 uart->rx_dma_nrows++;
527 if (uart->rx_dma_nrows == DMA_RX_YCOUNT) {
528 uart->rx_dma_nrows = 0;
529 uart->rx_dma_buf.tail = DMA_RX_XCOUNT*DMA_RX_YCOUNT;
530 bfin_serial_dma_rx_chars(uart);
531 uart->rx_dma_buf.head = uart->rx_dma_buf.tail = 0;
533 spin_lock(&uart->port.lock);
534 irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
535 clear_dma_irqstat(uart->rx_dma_channel);
537 spin_unlock(&uart->port.lock);
543 * Return TIOCSER_TEMT when transmitter is not busy.
545 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
547 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
550 lsr = UART_GET_LSR(uart);
557 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
559 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
560 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
561 if (uart->cts_pin < 0)
562 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
564 if (gpio_get_value(uart->cts_pin))
565 return TIOCM_DSR | TIOCM_CAR;
568 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
571 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
573 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
574 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
575 if (uart->rts_pin < 0)
578 if (mctrl & TIOCM_RTS)
579 gpio_set_value(uart->rts_pin, 0);
581 gpio_set_value(uart->rts_pin, 1);
586 * Handle any change of modem status signal since we were last called.
588 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart)
590 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
592 # ifdef CONFIG_SERIAL_BFIN_DMA
593 struct uart_info *info = uart->port.info;
594 struct tty_struct *tty = info->tty;
596 status = bfin_serial_get_mctrl(&uart->port);
597 if (!(status & TIOCM_CTS)) {
603 status = bfin_serial_get_mctrl(&uart->port);
604 uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
605 if (!(status & TIOCM_CTS))
606 schedule_work(&uart->cts_workqueue);
612 * Interrupts are always disabled.
614 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
616 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
617 u16 lcr = UART_GET_LCR(uart);
622 UART_PUT_LCR(uart, lcr);
626 static int bfin_serial_startup(struct uart_port *port)
628 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
630 #ifdef CONFIG_SERIAL_BFIN_DMA
631 dma_addr_t dma_handle;
633 if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
634 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
638 if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
639 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
640 free_dma(uart->rx_dma_channel);
644 set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
645 set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
647 uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
648 uart->rx_dma_buf.head = 0;
649 uart->rx_dma_buf.tail = 0;
650 uart->rx_dma_nrows = 0;
652 set_dma_config(uart->rx_dma_channel,
653 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
654 INTR_ON_ROW, DIMENSION_2D,
657 set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
658 set_dma_x_modify(uart->rx_dma_channel, 1);
659 set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
660 set_dma_y_modify(uart->rx_dma_channel, 1);
661 set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
662 enable_dma(uart->rx_dma_channel);
664 uart->rx_dma_timer.data = (unsigned long)(uart);
665 uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
666 uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
667 add_timer(&(uart->rx_dma_timer));
669 if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
670 "BFIN_UART_RX", uart)) {
671 # ifdef CONFIG_KGDB_UART
672 if (uart->port.line != CONFIG_KGDB_UART_PORT) {
674 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
676 # ifdef CONFIG_KGDB_UART
683 (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED,
684 "BFIN_UART_TX", uart)) {
685 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
686 free_irq(uart->port.irq, uart);
691 UART_SET_IER(uart, ERBFI);
693 UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
698 static void bfin_serial_shutdown(struct uart_port *port)
700 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
702 #ifdef CONFIG_SERIAL_BFIN_DMA
703 disable_dma(uart->tx_dma_channel);
704 free_dma(uart->tx_dma_channel);
705 disable_dma(uart->rx_dma_channel);
706 free_dma(uart->rx_dma_channel);
707 del_timer(&(uart->rx_dma_timer));
708 dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
710 #ifdef CONFIG_KGDB_UART
711 if (uart->port.line != CONFIG_KGDB_UART_PORT)
713 free_irq(uart->port.irq, uart);
714 free_irq(uart->port.irq+1, uart);
719 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
720 struct ktermios *old)
722 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
724 unsigned int baud, quot;
725 unsigned short val, ier, lsr, lcr = 0;
727 switch (termios->c_cflag & CSIZE) {
741 printk(KERN_ERR "%s: word lengh not supported\n",
745 if (termios->c_cflag & CSTOPB)
747 if (termios->c_cflag & PARENB)
749 if (!(termios->c_cflag & PARODD))
751 if (termios->c_cflag & CMSPAR)
754 port->read_status_mask = OE;
755 if (termios->c_iflag & INPCK)
756 port->read_status_mask |= (FE | PE);
757 if (termios->c_iflag & (BRKINT | PARMRK))
758 port->read_status_mask |= BI;
761 * Characters to ignore
763 port->ignore_status_mask = 0;
764 if (termios->c_iflag & IGNPAR)
765 port->ignore_status_mask |= FE | PE;
766 if (termios->c_iflag & IGNBRK) {
767 port->ignore_status_mask |= BI;
769 * If we're ignoring parity and break indicators,
770 * ignore overruns too (for real raw support).
772 if (termios->c_iflag & IGNPAR)
773 port->ignore_status_mask |= OE;
776 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
777 quot = uart_get_divisor(port, baud);
778 spin_lock_irqsave(&uart->port.lock, flags);
781 lsr = UART_GET_LSR(uart);
782 } while (!(lsr & TEMT));
785 ier = UART_GET_IER(uart);
787 UART_CLEAR_IER(uart, 0xF);
789 UART_PUT_IER(uart, 0);
793 /* Set DLAB in LCR to Access DLL and DLH */
794 val = UART_GET_LCR(uart);
796 UART_PUT_LCR(uart, val);
800 UART_PUT_DLL(uart, quot & 0xFF);
802 UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
806 /* Clear DLAB in LCR to Access THR RBR IER */
807 val = UART_GET_LCR(uart);
809 UART_PUT_LCR(uart, val);
813 UART_PUT_LCR(uart, lcr);
817 UART_SET_IER(uart, ier);
819 UART_PUT_IER(uart, ier);
822 val = UART_GET_GCTL(uart);
824 UART_PUT_GCTL(uart, val);
826 spin_unlock_irqrestore(&uart->port.lock, flags);
829 static const char *bfin_serial_type(struct uart_port *port)
831 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
833 return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
837 * Release the memory region(s) being used by 'port'.
839 static void bfin_serial_release_port(struct uart_port *port)
844 * Request the memory region(s) being used by 'port'.
846 static int bfin_serial_request_port(struct uart_port *port)
852 * Configure/autoconfigure the port.
854 static void bfin_serial_config_port(struct uart_port *port, int flags)
856 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
858 if (flags & UART_CONFIG_TYPE &&
859 bfin_serial_request_port(&uart->port) == 0)
860 uart->port.type = PORT_BFIN;
864 * Verify the new serial_struct (for TIOCSSERIAL).
865 * The only change we allow are to the flags and type, and
866 * even then only between PORT_BFIN and PORT_UNKNOWN
869 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
874 static struct uart_ops bfin_serial_pops = {
875 .tx_empty = bfin_serial_tx_empty,
876 .set_mctrl = bfin_serial_set_mctrl,
877 .get_mctrl = bfin_serial_get_mctrl,
878 .stop_tx = bfin_serial_stop_tx,
879 .start_tx = bfin_serial_start_tx,
880 .stop_rx = bfin_serial_stop_rx,
881 .enable_ms = bfin_serial_enable_ms,
882 .break_ctl = bfin_serial_break_ctl,
883 .startup = bfin_serial_startup,
884 .shutdown = bfin_serial_shutdown,
885 .set_termios = bfin_serial_set_termios,
886 .type = bfin_serial_type,
887 .release_port = bfin_serial_release_port,
888 .request_port = bfin_serial_request_port,
889 .config_port = bfin_serial_config_port,
890 .verify_port = bfin_serial_verify_port,
893 static void __init bfin_serial_init_ports(void)
895 static int first = 1;
902 for (i = 0; i < nr_ports; i++) {
903 bfin_serial_ports[i].port.uartclk = get_sclk();
904 bfin_serial_ports[i].port.ops = &bfin_serial_pops;
905 bfin_serial_ports[i].port.line = i;
906 bfin_serial_ports[i].port.iotype = UPIO_MEM;
907 bfin_serial_ports[i].port.membase =
908 (void __iomem *)bfin_serial_resource[i].uart_base_addr;
909 bfin_serial_ports[i].port.mapbase =
910 bfin_serial_resource[i].uart_base_addr;
911 bfin_serial_ports[i].port.irq =
912 bfin_serial_resource[i].uart_irq;
913 bfin_serial_ports[i].port.flags = UPF_BOOT_AUTOCONF;
914 #ifdef CONFIG_SERIAL_BFIN_DMA
915 bfin_serial_ports[i].tx_done = 1;
916 bfin_serial_ports[i].tx_count = 0;
917 bfin_serial_ports[i].tx_dma_channel =
918 bfin_serial_resource[i].uart_tx_dma_channel;
919 bfin_serial_ports[i].rx_dma_channel =
920 bfin_serial_resource[i].uart_rx_dma_channel;
921 init_timer(&(bfin_serial_ports[i].rx_dma_timer));
923 INIT_WORK(&bfin_serial_ports[i].cts_workqueue, bfin_serial_do_work);
925 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
926 bfin_serial_ports[i].cts_pin =
927 bfin_serial_resource[i].uart_cts_pin;
928 bfin_serial_ports[i].rts_pin =
929 bfin_serial_resource[i].uart_rts_pin;
931 bfin_serial_hw_init(&bfin_serial_ports[i]);
936 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
938 * If the port was already initialised (eg, by a boot loader),
939 * try to determine the current setup.
942 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
943 int *parity, int *bits)
945 unsigned short status;
947 status = UART_GET_IER(uart) & (ERBFI | ETBEI);
948 if (status == (ERBFI | ETBEI)) {
949 /* ok, the port was enabled */
950 unsigned short lcr, val;
951 unsigned short dlh, dll;
953 lcr = UART_GET_LCR(uart);
962 switch (lcr & 0x03) {
963 case 0: *bits = 5; break;
964 case 1: *bits = 6; break;
965 case 2: *bits = 7; break;
966 case 3: *bits = 8; break;
969 /* Set DLAB in LCR to Access DLL and DLH */
970 val = UART_GET_LCR(uart);
972 UART_PUT_LCR(uart, val);
975 dll = UART_GET_DLL(uart);
976 dlh = UART_GET_DLH(uart);
979 /* Clear DLAB in LCR to Access THR RBR IER */
980 val = UART_GET_LCR(uart);
982 UART_PUT_LCR(uart, val);
985 *baud = get_sclk() / (16*(dll | dlh << 8));
987 pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __FUNCTION__, *baud, *parity, *bits);
991 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
992 static struct uart_driver bfin_serial_reg;
995 bfin_serial_console_setup(struct console *co, char *options)
997 struct bfin_serial_port *uart;
998 # ifdef CONFIG_SERIAL_BFIN_CONSOLE
1002 # ifdef CONFIG_SERIAL_BFIN_CTSRTS
1010 * Check whether an invalid uart number has been specified, and
1011 * if so, search for the first available port that does have
1014 if (co->index == -1 || co->index >= nr_ports)
1016 uart = &bfin_serial_ports[co->index];
1018 # ifdef CONFIG_SERIAL_BFIN_CONSOLE
1020 uart_parse_options(options, &baud, &parity, &bits, &flow);
1022 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1024 return uart_set_options(&uart->port, co, baud, parity, bits, flow);
1029 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1030 defined (CONFIG_EARLY_PRINTK) */
1032 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1033 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1035 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1036 while (!(UART_GET_LSR(uart) & THRE))
1038 UART_PUT_CHAR(uart, ch);
1043 * Interrupts are disabled on entering
1046 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1048 struct bfin_serial_port *uart = &bfin_serial_ports[co->index];
1051 spin_lock_irqsave(&uart->port.lock, flags);
1052 uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1053 spin_unlock_irqrestore(&uart->port.lock, flags);
1057 static struct console bfin_serial_console = {
1058 .name = BFIN_SERIAL_NAME,
1059 .write = bfin_serial_console_write,
1060 .device = uart_console_device,
1061 .setup = bfin_serial_console_setup,
1062 .flags = CON_PRINTBUFFER,
1064 .data = &bfin_serial_reg,
1067 static int __init bfin_serial_rs_console_init(void)
1069 bfin_serial_init_ports();
1070 register_console(&bfin_serial_console);
1071 #ifdef CONFIG_KGDB_UART
1072 kgdb_entry_state = 0;
1077 console_initcall(bfin_serial_rs_console_init);
1079 #define BFIN_SERIAL_CONSOLE &bfin_serial_console
1081 #define BFIN_SERIAL_CONSOLE NULL
1082 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1085 #ifdef CONFIG_EARLY_PRINTK
1086 static __init void early_serial_putc(struct uart_port *port, int ch)
1088 unsigned timeout = 0xffff;
1089 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1091 while ((!(UART_GET_LSR(uart) & THRE)) && --timeout)
1093 UART_PUT_CHAR(uart, ch);
1096 static __init void early_serial_write(struct console *con, const char *s,
1099 struct bfin_serial_port *uart = &bfin_serial_ports[con->index];
1102 for (i = 0; i < n; i++, s++) {
1104 early_serial_putc(&uart->port, '\r');
1105 early_serial_putc(&uart->port, *s);
1109 static struct __init console bfin_early_serial_console = {
1110 .name = "early_BFuart",
1111 .write = early_serial_write,
1112 .device = uart_console_device,
1113 .flags = CON_PRINTBUFFER,
1114 .setup = bfin_serial_console_setup,
1116 .data = &bfin_serial_reg,
1119 struct console __init *bfin_earlyserial_init(unsigned int port,
1122 struct bfin_serial_port *uart;
1125 if (port == -1 || port >= nr_ports)
1127 bfin_serial_init_ports();
1128 bfin_early_serial_console.index = port;
1129 uart = &bfin_serial_ports[port];
1135 bfin_serial_set_termios(&uart->port, &t, &t);
1136 return &bfin_early_serial_console;
1139 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1141 static struct uart_driver bfin_serial_reg = {
1142 .owner = THIS_MODULE,
1143 .driver_name = "bfin-uart",
1144 .dev_name = BFIN_SERIAL_NAME,
1145 .major = BFIN_SERIAL_MAJOR,
1146 .minor = BFIN_SERIAL_MINOR,
1148 .cons = BFIN_SERIAL_CONSOLE,
1151 static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state)
1153 struct bfin_serial_port *uart = platform_get_drvdata(dev);
1156 uart_suspend_port(&bfin_serial_reg, &uart->port);
1161 static int bfin_serial_resume(struct platform_device *dev)
1163 struct bfin_serial_port *uart = platform_get_drvdata(dev);
1166 uart_resume_port(&bfin_serial_reg, &uart->port);
1171 static int bfin_serial_probe(struct platform_device *dev)
1173 struct resource *res = dev->resource;
1176 for (i = 0; i < dev->num_resources; i++, res++)
1177 if (res->flags & IORESOURCE_MEM)
1180 if (i < dev->num_resources) {
1181 for (i = 0; i < nr_ports; i++, res++) {
1182 if (bfin_serial_ports[i].port.mapbase != res->start)
1184 bfin_serial_ports[i].port.dev = &dev->dev;
1185 uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1186 platform_set_drvdata(dev, &bfin_serial_ports[i]);
1193 static int bfin_serial_remove(struct platform_device *pdev)
1195 struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1198 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
1199 gpio_free(uart->cts_pin);
1200 gpio_free(uart->rts_pin);
1203 platform_set_drvdata(pdev, NULL);
1206 uart_remove_one_port(&bfin_serial_reg, &uart->port);
1211 static struct platform_driver bfin_serial_driver = {
1212 .probe = bfin_serial_probe,
1213 .remove = bfin_serial_remove,
1214 .suspend = bfin_serial_suspend,
1215 .resume = bfin_serial_resume,
1217 .name = "bfin-uart",
1221 static int __init bfin_serial_init(void)
1224 #ifdef CONFIG_KGDB_UART
1225 struct bfin_serial_port *uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
1229 pr_info("Serial: Blackfin serial driver\n");
1231 bfin_serial_init_ports();
1233 ret = uart_register_driver(&bfin_serial_reg);
1235 ret = platform_driver_register(&bfin_serial_driver);
1237 pr_debug("uart register failed\n");
1238 uart_unregister_driver(&bfin_serial_reg);
1241 #ifdef CONFIG_KGDB_UART
1242 if (uart->port.cons->index != CONFIG_KGDB_UART_PORT) {
1243 request_irq(uart->port.irq, bfin_serial_rx_int,
1244 IRQF_DISABLED, "BFIN_UART_RX", uart);
1245 pr_info("Request irq for kgdb uart port\n");
1247 UART_SET_IER(uart, ERBFI);
1249 UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
1252 t.c_cflag = CS8|B57600;
1256 t.c_line = CONFIG_KGDB_UART_PORT;
1257 bfin_serial_set_termios(&uart->port, &t, &t);
1263 static void __exit bfin_serial_exit(void)
1265 platform_driver_unregister(&bfin_serial_driver);
1266 uart_unregister_driver(&bfin_serial_reg);
1269 module_init(bfin_serial_init);
1270 module_exit(bfin_serial_exit);
1272 MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>");
1273 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1274 MODULE_LICENSE("GPL");
1275 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);