Merge branch 'master' of /pub/scm/linux/kernel/git/torvalds/linux-2.6
[linux-2.6] / drivers / serial / bfin_5xx.c
1 /*
2  * Blackfin On-Chip Serial Driver
3  *
4  * Copyright 2006-2007 Analog Devices Inc.
5  *
6  * Enter bugs at http://blackfin.uclinux.org/
7  *
8  * Licensed under the GPL-2 or later.
9  */
10
11 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
12 #define SUPPORT_SYSRQ
13 #endif
14
15 #include <linux/module.h>
16 #include <linux/ioport.h>
17 #include <linux/init.h>
18 #include <linux/console.h>
19 #include <linux/sysrq.h>
20 #include <linux/platform_device.h>
21 #include <linux/tty.h>
22 #include <linux/tty_flip.h>
23 #include <linux/serial_core.h>
24
25 #ifdef CONFIG_KGDB_UART
26 #include <linux/kgdb.h>
27 #include <asm/irq_regs.h>
28 #endif
29
30 #include <asm/gpio.h>
31 #include <asm/mach/bfin_serial_5xx.h>
32
33 #ifdef CONFIG_SERIAL_BFIN_DMA
34 #include <linux/dma-mapping.h>
35 #include <asm/io.h>
36 #include <asm/irq.h>
37 #include <asm/cacheflush.h>
38 #endif
39
40 /* UART name and device definitions */
41 #define BFIN_SERIAL_NAME        "ttyBF"
42 #define BFIN_SERIAL_MAJOR       204
43 #define BFIN_SERIAL_MINOR       64
44
45 /*
46  * Setup for console. Argument comes from the menuconfig
47  */
48 #define DMA_RX_XCOUNT           512
49 #define DMA_RX_YCOUNT           (PAGE_SIZE / DMA_RX_XCOUNT)
50
51 #define DMA_RX_FLUSH_JIFFIES    (HZ / 50)
52
53 #ifdef CONFIG_SERIAL_BFIN_DMA
54 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart);
55 #else
56 static void bfin_serial_tx_chars(struct bfin_serial_port *uart);
57 #endif
58
59 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart);
60
61 /*
62  * interrupts are disabled on entry
63  */
64 static void bfin_serial_stop_tx(struct uart_port *port)
65 {
66         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
67         struct circ_buf *xmit = &uart->port.info->xmit;
68 #if !defined(CONFIG_BF54x) && !defined(CONFIG_SERIAL_BFIN_DMA)
69         unsigned short ier;
70 #endif
71
72         while (!(UART_GET_LSR(uart) & TEMT))
73                 cpu_relax();
74
75 #ifdef CONFIG_SERIAL_BFIN_DMA
76         disable_dma(uart->tx_dma_channel);
77         xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
78         uart->port.icount.tx += uart->tx_count;
79         uart->tx_count = 0;
80         uart->tx_done = 1;
81 #else
82 #ifdef CONFIG_BF54x
83         /* Clear TFI bit */
84         UART_PUT_LSR(uart, TFI);
85         UART_CLEAR_IER(uart, ETBEI);
86 #else
87         ier = UART_GET_IER(uart);
88         ier &= ~ETBEI;
89         UART_PUT_IER(uart, ier);
90 #endif
91 #endif
92 }
93
94 /*
95  * port is locked and interrupts are disabled
96  */
97 static void bfin_serial_start_tx(struct uart_port *port)
98 {
99         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
100
101 #ifdef CONFIG_SERIAL_BFIN_DMA
102         if (uart->tx_done)
103                 bfin_serial_dma_tx_chars(uart);
104 #else
105 #ifdef CONFIG_BF54x
106         UART_SET_IER(uart, ETBEI);
107 #else
108         unsigned short ier;
109         ier = UART_GET_IER(uart);
110         ier |= ETBEI;
111         UART_PUT_IER(uart, ier);
112 #endif
113         bfin_serial_tx_chars(uart);
114 #endif
115 }
116
117 /*
118  * Interrupts are enabled
119  */
120 static void bfin_serial_stop_rx(struct uart_port *port)
121 {
122         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
123 #ifdef  CONFIG_KGDB_UART
124         if (uart->port.line != CONFIG_KGDB_UART_PORT) {
125 #endif
126 #ifdef CONFIG_BF54x
127         UART_CLEAR_IER(uart, ERBFI);
128 #else
129         unsigned short ier;
130
131         ier = UART_GET_IER(uart);
132         ier &= ~ERBFI;
133         UART_PUT_IER(uart, ier);
134 #endif
135 #ifdef  CONFIG_KGDB_UART
136         }
137 #endif
138 }
139
140 /*
141  * Set the modem control timer to fire immediately.
142  */
143 static void bfin_serial_enable_ms(struct uart_port *port)
144 {
145 }
146
147 #ifdef CONFIG_KGDB_UART
148 static int kgdb_entry_state;
149
150 void kgdb_put_debug_char(int chr)
151 {
152         struct bfin_serial_port *uart;
153         
154         if (CONFIG_KGDB_UART_PORT < 0
155                 || CONFIG_KGDB_UART_PORT >= BFIN_UART_NR_PORTS)
156                 uart = &bfin_serial_ports[0];
157         else
158                 uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
159         
160         while (!(UART_GET_LSR(uart) & THRE)) {
161                 SSYNC();
162         }
163
164 #ifndef CONFIG_BF54x
165         UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB));
166         SSYNC();
167 #endif
168         UART_PUT_CHAR(uart, (unsigned char)chr);
169         SSYNC();
170 }
171
172 int kgdb_get_debug_char(void)
173 {
174         struct bfin_serial_port *uart;
175         unsigned char chr;
176
177         if (CONFIG_KGDB_UART_PORT < 0
178                 || CONFIG_KGDB_UART_PORT >= BFIN_UART_NR_PORTS)
179                 uart = &bfin_serial_ports[0];
180         else
181                 uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
182         
183         while(!(UART_GET_LSR(uart) & DR)) {
184                 SSYNC();
185         }
186 #ifndef CONFIG_BF54x
187         UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB));
188         SSYNC();
189 #endif
190         chr = UART_GET_CHAR(uart);
191         SSYNC();
192
193         return chr;
194 }
195 #endif
196
197 #if ANOMALY_05000363 && defined(CONFIG_SERIAL_BFIN_PIO)
198 # define UART_GET_ANOMALY_THRESHOLD(uart)    ((uart)->anomaly_threshold)
199 # define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v))
200 #else
201 # define UART_GET_ANOMALY_THRESHOLD(uart)    0
202 # define UART_SET_ANOMALY_THRESHOLD(uart, v)
203 #endif
204
205 #ifdef CONFIG_SERIAL_BFIN_PIO
206 static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
207 {
208         struct tty_struct *tty = uart->port.info->tty;
209         unsigned int status, ch, flg;
210         static struct timeval anomaly_start = { .tv_sec = 0 };
211 #ifdef CONFIG_KGDB_UART
212         struct pt_regs *regs = get_irq_regs();
213 #endif
214
215         status = UART_GET_LSR(uart);
216         UART_CLEAR_LSR(uart);
217
218         ch = UART_GET_CHAR(uart);
219         uart->port.icount.rx++;
220
221 #ifdef CONFIG_KGDB_UART
222         if (uart->port.line == CONFIG_KGDB_UART_PORT) {
223                 if (uart->port.cons->index == CONFIG_KGDB_UART_PORT && ch == 0x1) { /* Ctrl + A */
224                         kgdb_breakkey_pressed(regs);
225                         return;
226                 } else if (kgdb_entry_state == 0 && ch == '$') {/* connection from KGDB */
227                         kgdb_entry_state = 1;
228                 } else if (kgdb_entry_state == 1 && ch == 'q') {
229                         kgdb_entry_state = 0;
230                         kgdb_breakkey_pressed(regs);
231                         return;
232                 } else if (ch == 0x3) {/* Ctrl + C */
233                         kgdb_entry_state = 0;
234                         kgdb_breakkey_pressed(regs);
235                         return;
236                 } else {
237                         kgdb_entry_state = 0;
238                 }
239         }
240 #endif
241
242         if (ANOMALY_05000363) {
243                 /* The BF533 (and BF561) family of processors have a nice anomaly
244                  * where they continuously generate characters for a "single" break.
245                  * We have to basically ignore this flood until the "next" valid
246                  * character comes across.  Due to the nature of the flood, it is
247                  * not possible to reliably catch bytes that are sent too quickly
248                  * after this break.  So application code talking to the Blackfin
249                  * which sends a break signal must allow at least 1.5 character
250                  * times after the end of the break for things to stabilize.  This
251                  * timeout was picked as it must absolutely be larger than 1
252                  * character time +/- some percent.  So 1.5 sounds good.  All other
253                  * Blackfin families operate properly.  Woo.
254                  */
255                 if (anomaly_start.tv_sec) {
256                         struct timeval curr;
257                         suseconds_t usecs;
258
259                         if ((~ch & (~ch + 1)) & 0xff)
260                                 goto known_good_char;
261
262                         do_gettimeofday(&curr);
263                         if (curr.tv_sec - anomaly_start.tv_sec > 1)
264                                 goto known_good_char;
265
266                         usecs = 0;
267                         if (curr.tv_sec != anomaly_start.tv_sec)
268                                 usecs += USEC_PER_SEC;
269                         usecs += curr.tv_usec - anomaly_start.tv_usec;
270
271                         if (usecs > UART_GET_ANOMALY_THRESHOLD(uart))
272                                 goto known_good_char;
273
274                         if (ch)
275                                 anomaly_start.tv_sec = 0;
276                         else
277                                 anomaly_start = curr;
278
279                         return;
280
281  known_good_char:
282                         anomaly_start.tv_sec = 0;
283                 }
284         }
285
286         if (status & BI) {
287                 if (ANOMALY_05000363)
288                         if (bfin_revid() < 5)
289                                 do_gettimeofday(&anomaly_start);
290                 uart->port.icount.brk++;
291                 if (uart_handle_break(&uart->port))
292                         goto ignore_char;
293                 status &= ~(PE | FE);
294         }
295         if (status & PE)
296                 uart->port.icount.parity++;
297         if (status & OE)
298                 uart->port.icount.overrun++;
299         if (status & FE)
300                 uart->port.icount.frame++;
301
302         status &= uart->port.read_status_mask;
303
304         if (status & BI)
305                 flg = TTY_BREAK;
306         else if (status & PE)
307                 flg = TTY_PARITY;
308         else if (status & FE)
309                 flg = TTY_FRAME;
310         else
311                 flg = TTY_NORMAL;
312
313         if (uart_handle_sysrq_char(&uart->port, ch))
314                 goto ignore_char;
315
316         uart_insert_char(&uart->port, status, OE, ch, flg);
317
318  ignore_char:
319         tty_flip_buffer_push(tty);
320 }
321
322 static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
323 {
324         struct circ_buf *xmit = &uart->port.info->xmit;
325
326         if (uart->port.x_char) {
327                 UART_PUT_CHAR(uart, uart->port.x_char);
328                 uart->port.icount.tx++;
329                 uart->port.x_char = 0;
330         }
331         /*
332          * Check the modem control lines before
333          * transmitting anything.
334          */
335         bfin_serial_mctrl_check(uart);
336
337         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
338                 bfin_serial_stop_tx(&uart->port);
339                 return;
340         }
341
342         while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
343                 UART_PUT_CHAR(uart, xmit->buf[xmit->tail]);
344                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
345                 uart->port.icount.tx++;
346                 SSYNC();
347         }
348
349         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
350                 uart_write_wakeup(&uart->port);
351
352         if (uart_circ_empty(xmit))
353                 bfin_serial_stop_tx(&uart->port);
354 }
355
356 static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
357 {
358         struct bfin_serial_port *uart = dev_id;
359
360         spin_lock(&uart->port.lock);
361         while (UART_GET_LSR(uart) & DR)
362                 bfin_serial_rx_chars(uart);
363         spin_unlock(&uart->port.lock);
364
365         return IRQ_HANDLED;
366 }
367
368 static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
369 {
370         struct bfin_serial_port *uart = dev_id;
371
372         spin_lock(&uart->port.lock);
373         if (UART_GET_LSR(uart) & THRE)
374                 bfin_serial_tx_chars(uart);
375         spin_unlock(&uart->port.lock);
376
377         return IRQ_HANDLED;
378 }
379 #endif
380
381 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
382 static void bfin_serial_do_work(struct work_struct *work)
383 {
384         struct bfin_serial_port *uart = container_of(work, struct bfin_serial_port, cts_workqueue);
385
386         bfin_serial_mctrl_check(uart);
387 }
388 #endif
389
390 #ifdef CONFIG_SERIAL_BFIN_DMA
391 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
392 {
393         struct circ_buf *xmit = &uart->port.info->xmit;
394         unsigned short ier;
395
396         uart->tx_done = 0;
397
398         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
399                 uart->tx_count = 0;
400                 uart->tx_done = 1;
401                 return;
402         }
403
404         if (uart->port.x_char) {
405                 UART_PUT_CHAR(uart, uart->port.x_char);
406                 uart->port.icount.tx++;
407                 uart->port.x_char = 0;
408         }
409
410         /*
411          * Check the modem control lines before
412          * transmitting anything.
413          */
414         bfin_serial_mctrl_check(uart);
415
416         uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
417         if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
418                 uart->tx_count = UART_XMIT_SIZE - xmit->tail;
419         blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
420                                         (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
421         set_dma_config(uart->tx_dma_channel,
422                 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
423                         INTR_ON_BUF,
424                         DIMENSION_LINEAR,
425                         DATA_SIZE_8,
426                         DMA_SYNC_RESTART));
427         set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
428         set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
429         set_dma_x_modify(uart->tx_dma_channel, 1);
430         enable_dma(uart->tx_dma_channel);
431
432 #ifdef CONFIG_BF54x
433         UART_SET_IER(uart, ETBEI);
434 #else
435         ier = UART_GET_IER(uart);
436         ier |= ETBEI;
437         UART_PUT_IER(uart, ier);
438 #endif
439 }
440
441 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
442 {
443         struct tty_struct *tty = uart->port.info->tty;
444         int i, flg, status;
445
446         status = UART_GET_LSR(uart);
447         UART_CLEAR_LSR(uart);
448
449         uart->port.icount.rx +=
450                 CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail,
451                 UART_XMIT_SIZE);
452
453         if (status & BI) {
454                 uart->port.icount.brk++;
455                 if (uart_handle_break(&uart->port))
456                         goto dma_ignore_char;
457                 status &= ~(PE | FE);
458         }
459         if (status & PE)
460                 uart->port.icount.parity++;
461         if (status & OE)
462                 uart->port.icount.overrun++;
463         if (status & FE)
464                 uart->port.icount.frame++;
465
466         status &= uart->port.read_status_mask;
467
468         if (status & BI)
469                 flg = TTY_BREAK;
470         else if (status & PE)
471                 flg = TTY_PARITY;
472         else if (status & FE)
473                 flg = TTY_FRAME;
474         else
475                 flg = TTY_NORMAL;
476
477         for (i = uart->rx_dma_buf.tail; i != uart->rx_dma_buf.head; i++) {
478                 if (i >= UART_XMIT_SIZE)
479                         i = 0;
480                 if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
481                         uart_insert_char(&uart->port, status, OE,
482                                 uart->rx_dma_buf.buf[i], flg);
483         }
484
485  dma_ignore_char:
486         tty_flip_buffer_push(tty);
487 }
488
489 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
490 {
491         int x_pos, pos;
492
493         uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
494         x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
495         uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
496         if (uart->rx_dma_nrows == DMA_RX_YCOUNT)
497                 uart->rx_dma_nrows = 0;
498         x_pos = DMA_RX_XCOUNT - x_pos;
499         if (x_pos == DMA_RX_XCOUNT)
500                 x_pos = 0;
501
502         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
503         if (pos != uart->rx_dma_buf.tail) {
504                 uart->rx_dma_buf.head = pos;
505                 bfin_serial_dma_rx_chars(uart);
506                 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
507         }
508
509         mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES);
510 }
511
512 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
513 {
514         struct bfin_serial_port *uart = dev_id;
515         struct circ_buf *xmit = &uart->port.info->xmit;
516         unsigned short ier;
517
518         spin_lock(&uart->port.lock);
519         if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
520                 disable_dma(uart->tx_dma_channel);
521                 clear_dma_irqstat(uart->tx_dma_channel);
522 #ifdef CONFIG_BF54x
523                 UART_CLEAR_IER(uart, ETBEI);
524 #else
525                 ier = UART_GET_IER(uart);
526                 ier &= ~ETBEI;
527                 UART_PUT_IER(uart, ier);
528 #endif
529                 xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
530                 uart->port.icount.tx += uart->tx_count;
531
532                 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
533                         uart_write_wakeup(&uart->port);
534
535                 bfin_serial_dma_tx_chars(uart);
536         }
537
538         spin_unlock(&uart->port.lock);
539         return IRQ_HANDLED;
540 }
541
542 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
543 {
544         struct bfin_serial_port *uart = dev_id;
545         unsigned short irqstat;
546
547         spin_lock(&uart->port.lock);
548         irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
549         clear_dma_irqstat(uart->rx_dma_channel);
550         spin_unlock(&uart->port.lock);
551
552         mod_timer(&(uart->rx_dma_timer), jiffies);
553
554         return IRQ_HANDLED;
555 }
556 #endif
557
558 /*
559  * Return TIOCSER_TEMT when transmitter is not busy.
560  */
561 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
562 {
563         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
564         unsigned short lsr;
565
566         lsr = UART_GET_LSR(uart);
567         if (lsr & TEMT)
568                 return TIOCSER_TEMT;
569         else
570                 return 0;
571 }
572
573 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
574 {
575 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
576         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
577         if (uart->cts_pin < 0)
578                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
579
580 # ifdef BF54x
581         if (UART_GET_MSR(uart) & CTS)
582 # else
583         if (gpio_get_value(uart->cts_pin))
584 # endif
585                 return TIOCM_DSR | TIOCM_CAR;
586         else
587 #endif
588                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
589 }
590
591 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
592 {
593 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
594         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
595         if (uart->rts_pin < 0)
596                 return;
597
598         if (mctrl & TIOCM_RTS)
599 # ifdef BF54x
600                 UART_PUT_MCR(uart, UART_GET_MCR(uart) & ~MRTS);
601 # else
602                 gpio_set_value(uart->rts_pin, 0);
603 # endif
604         else
605 # ifdef BF54x
606                 UART_PUT_MCR(uart, UART_GET_MCR(uart) | MRTS);
607 # else
608                 gpio_set_value(uart->rts_pin, 1);
609 # endif
610 #endif
611 }
612
613 /*
614  * Handle any change of modem status signal since we were last called.
615  */
616 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart)
617 {
618 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
619         unsigned int status;
620         struct uart_info *info = uart->port.info;
621         struct tty_struct *tty = info->tty;
622
623         status = bfin_serial_get_mctrl(&uart->port);
624         uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
625         if (!(status & TIOCM_CTS)) {
626                 tty->hw_stopped = 1;
627                 schedule_work(&uart->cts_workqueue);
628         } else {
629                 tty->hw_stopped = 0;
630         }
631 #endif
632 }
633
634 /*
635  * Interrupts are always disabled.
636  */
637 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
638 {
639         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
640         u16 lcr = UART_GET_LCR(uart);
641         if (break_state)
642                 lcr |= SB;
643         else
644                 lcr &= ~SB;
645         UART_PUT_LCR(uart, lcr);
646         SSYNC();
647 }
648
649 static int bfin_serial_startup(struct uart_port *port)
650 {
651         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
652
653 #ifdef CONFIG_SERIAL_BFIN_DMA
654         dma_addr_t dma_handle;
655
656         if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
657                 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
658                 return -EBUSY;
659         }
660
661         if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
662                 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
663                 free_dma(uart->rx_dma_channel);
664                 return -EBUSY;
665         }
666
667         set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
668         set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
669
670         uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
671         uart->rx_dma_buf.head = 0;
672         uart->rx_dma_buf.tail = 0;
673         uart->rx_dma_nrows = 0;
674
675         set_dma_config(uart->rx_dma_channel,
676                 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
677                                 INTR_ON_ROW, DIMENSION_2D,
678                                 DATA_SIZE_8,
679                                 DMA_SYNC_RESTART));
680         set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
681         set_dma_x_modify(uart->rx_dma_channel, 1);
682         set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
683         set_dma_y_modify(uart->rx_dma_channel, 1);
684         set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
685         enable_dma(uart->rx_dma_channel);
686
687         uart->rx_dma_timer.data = (unsigned long)(uart);
688         uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
689         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
690         add_timer(&(uart->rx_dma_timer));
691 #else
692         if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
693              "BFIN_UART_RX", uart)) {
694 # ifdef CONFIG_KGDB_UART
695                 if (uart->port.line != CONFIG_KGDB_UART_PORT) {
696 # endif
697                 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
698                 return -EBUSY;
699 # ifdef CONFIG_KGDB_UART
700                 }
701 # endif
702         }
703
704
705         if (request_irq
706             (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED,
707              "BFIN_UART_TX", uart)) {
708                 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
709                 free_irq(uart->port.irq, uart);
710                 return -EBUSY;
711         }
712 #endif
713 #ifdef CONFIG_BF54x
714         UART_SET_IER(uart, ERBFI);
715 #else
716         UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
717 #endif
718         return 0;
719 }
720
721 static void bfin_serial_shutdown(struct uart_port *port)
722 {
723         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
724
725 #ifdef CONFIG_SERIAL_BFIN_DMA
726         disable_dma(uart->tx_dma_channel);
727         free_dma(uart->tx_dma_channel);
728         disable_dma(uart->rx_dma_channel);
729         free_dma(uart->rx_dma_channel);
730         del_timer(&(uart->rx_dma_timer));
731         dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
732 #else
733 #ifdef  CONFIG_KGDB_UART
734         if (uart->port.line != CONFIG_KGDB_UART_PORT)
735 #endif
736         free_irq(uart->port.irq, uart);
737         free_irq(uart->port.irq+1, uart);
738 #endif
739 }
740
741 static void
742 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
743                    struct ktermios *old)
744 {
745         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
746         unsigned long flags;
747         unsigned int baud, quot;
748         unsigned short val, ier, lcr = 0;
749
750         switch (termios->c_cflag & CSIZE) {
751         case CS8:
752                 lcr = WLS(8);
753                 break;
754         case CS7:
755                 lcr = WLS(7);
756                 break;
757         case CS6:
758                 lcr = WLS(6);
759                 break;
760         case CS5:
761                 lcr = WLS(5);
762                 break;
763         default:
764                 printk(KERN_ERR "%s: word lengh not supported\n",
765                         __func__);
766         }
767
768         if (termios->c_cflag & CSTOPB)
769                 lcr |= STB;
770         if (termios->c_cflag & PARENB)
771                 lcr |= PEN;
772         if (!(termios->c_cflag & PARODD))
773                 lcr |= EPS;
774         if (termios->c_cflag & CMSPAR)
775                 lcr |= STP;
776
777         port->read_status_mask = OE;
778         if (termios->c_iflag & INPCK)
779                 port->read_status_mask |= (FE | PE);
780         if (termios->c_iflag & (BRKINT | PARMRK))
781                 port->read_status_mask |= BI;
782
783         /*
784          * Characters to ignore
785          */
786         port->ignore_status_mask = 0;
787         if (termios->c_iflag & IGNPAR)
788                 port->ignore_status_mask |= FE | PE;
789         if (termios->c_iflag & IGNBRK) {
790                 port->ignore_status_mask |= BI;
791                 /*
792                  * If we're ignoring parity and break indicators,
793                  * ignore overruns too (for real raw support).
794                  */
795                 if (termios->c_iflag & IGNPAR)
796                         port->ignore_status_mask |= OE;
797         }
798
799         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
800         quot = uart_get_divisor(port, baud);
801         spin_lock_irqsave(&uart->port.lock, flags);
802
803         UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
804
805         /* Disable UART */
806         ier = UART_GET_IER(uart);
807 #ifdef CONFIG_BF54x
808         UART_CLEAR_IER(uart, 0xF);
809 #else
810         UART_PUT_IER(uart, 0);
811 #endif
812
813 #ifndef CONFIG_BF54x
814         /* Set DLAB in LCR to Access DLL and DLH */
815         val = UART_GET_LCR(uart);
816         val |= DLAB;
817         UART_PUT_LCR(uart, val);
818         SSYNC();
819 #endif
820
821         UART_PUT_DLL(uart, quot & 0xFF);
822         SSYNC();
823         UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
824         SSYNC();
825
826 #ifndef CONFIG_BF54x
827         /* Clear DLAB in LCR to Access THR RBR IER */
828         val = UART_GET_LCR(uart);
829         val &= ~DLAB;
830         UART_PUT_LCR(uart, val);
831         SSYNC();
832 #endif
833
834         UART_PUT_LCR(uart, lcr);
835
836         /* Enable UART */
837 #ifdef CONFIG_BF54x
838         UART_SET_IER(uart, ier);
839 #else
840         UART_PUT_IER(uart, ier);
841 #endif
842
843         val = UART_GET_GCTL(uart);
844         val |= UCEN;
845         UART_PUT_GCTL(uart, val);
846
847         spin_unlock_irqrestore(&uart->port.lock, flags);
848 }
849
850 static const char *bfin_serial_type(struct uart_port *port)
851 {
852         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
853
854         return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
855 }
856
857 /*
858  * Release the memory region(s) being used by 'port'.
859  */
860 static void bfin_serial_release_port(struct uart_port *port)
861 {
862 }
863
864 /*
865  * Request the memory region(s) being used by 'port'.
866  */
867 static int bfin_serial_request_port(struct uart_port *port)
868 {
869         return 0;
870 }
871
872 /*
873  * Configure/autoconfigure the port.
874  */
875 static void bfin_serial_config_port(struct uart_port *port, int flags)
876 {
877         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
878
879         if (flags & UART_CONFIG_TYPE &&
880             bfin_serial_request_port(&uart->port) == 0)
881                 uart->port.type = PORT_BFIN;
882 }
883
884 /*
885  * Verify the new serial_struct (for TIOCSSERIAL).
886  * The only change we allow are to the flags and type, and
887  * even then only between PORT_BFIN and PORT_UNKNOWN
888  */
889 static int
890 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
891 {
892         return 0;
893 }
894
895 /*
896  * Enable the IrDA function if tty->ldisc.num is N_IRDA.
897  * In other cases, disable IrDA function.
898  */
899 static void bfin_set_ldisc(struct tty_struct *tty)
900 {
901         int line = tty->index;
902         unsigned short val;
903
904         if (line >= tty->driver->num)
905                 return;
906
907         switch (tty->ldisc.num) {
908         case N_IRDA:
909                 val = UART_GET_GCTL(&bfin_serial_ports[line]);
910                 val |= (IREN | RPOLC);
911                 UART_PUT_GCTL(&bfin_serial_ports[line], val);
912                 break;
913         default:
914                 val = UART_GET_GCTL(&bfin_serial_ports[line]);
915                 val &= ~(IREN | RPOLC);
916                 UART_PUT_GCTL(&bfin_serial_ports[line], val);
917         }
918 }
919
920 static struct uart_ops bfin_serial_pops = {
921         .tx_empty       = bfin_serial_tx_empty,
922         .set_mctrl      = bfin_serial_set_mctrl,
923         .get_mctrl      = bfin_serial_get_mctrl,
924         .stop_tx        = bfin_serial_stop_tx,
925         .start_tx       = bfin_serial_start_tx,
926         .stop_rx        = bfin_serial_stop_rx,
927         .enable_ms      = bfin_serial_enable_ms,
928         .break_ctl      = bfin_serial_break_ctl,
929         .startup        = bfin_serial_startup,
930         .shutdown       = bfin_serial_shutdown,
931         .set_termios    = bfin_serial_set_termios,
932         .type           = bfin_serial_type,
933         .release_port   = bfin_serial_release_port,
934         .request_port   = bfin_serial_request_port,
935         .config_port    = bfin_serial_config_port,
936         .verify_port    = bfin_serial_verify_port,
937 };
938
939 static void __init bfin_serial_init_ports(void)
940 {
941         static int first = 1;
942         int i;
943
944         if (!first)
945                 return;
946         first = 0;
947
948         for (i = 0; i < nr_ports; i++) {
949                 bfin_serial_ports[i].port.uartclk   = get_sclk();
950                 bfin_serial_ports[i].port.ops       = &bfin_serial_pops;
951                 bfin_serial_ports[i].port.line      = i;
952                 bfin_serial_ports[i].port.iotype    = UPIO_MEM;
953                 bfin_serial_ports[i].port.membase   =
954                         (void __iomem *)bfin_serial_resource[i].uart_base_addr;
955                 bfin_serial_ports[i].port.mapbase   =
956                         bfin_serial_resource[i].uart_base_addr;
957                 bfin_serial_ports[i].port.irq       =
958                         bfin_serial_resource[i].uart_irq;
959                 bfin_serial_ports[i].port.flags     = UPF_BOOT_AUTOCONF;
960 #ifdef CONFIG_SERIAL_BFIN_DMA
961                 bfin_serial_ports[i].tx_done        = 1;
962                 bfin_serial_ports[i].tx_count       = 0;
963                 bfin_serial_ports[i].tx_dma_channel =
964                         bfin_serial_resource[i].uart_tx_dma_channel;
965                 bfin_serial_ports[i].rx_dma_channel =
966                         bfin_serial_resource[i].uart_rx_dma_channel;
967                 init_timer(&(bfin_serial_ports[i].rx_dma_timer));
968 #endif
969 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
970                 INIT_WORK(&bfin_serial_ports[i].cts_workqueue, bfin_serial_do_work);
971                 bfin_serial_ports[i].cts_pin        =
972                         bfin_serial_resource[i].uart_cts_pin;
973                 bfin_serial_ports[i].rts_pin        =
974                         bfin_serial_resource[i].uart_rts_pin;
975 #endif
976                 bfin_serial_hw_init(&bfin_serial_ports[i]);
977         }
978
979 }
980
981 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
982 /*
983  * If the port was already initialised (eg, by a boot loader),
984  * try to determine the current setup.
985  */
986 static void __init
987 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
988                            int *parity, int *bits)
989 {
990         unsigned short status;
991
992         status = UART_GET_IER(uart) & (ERBFI | ETBEI);
993         if (status == (ERBFI | ETBEI)) {
994                 /* ok, the port was enabled */
995                 unsigned short lcr, val;
996                 unsigned short dlh, dll;
997
998                 lcr = UART_GET_LCR(uart);
999
1000                 *parity = 'n';
1001                 if (lcr & PEN) {
1002                         if (lcr & EPS)
1003                                 *parity = 'e';
1004                         else
1005                                 *parity = 'o';
1006                 }
1007                 switch (lcr & 0x03) {
1008                         case 0: *bits = 5; break;
1009                         case 1: *bits = 6; break;
1010                         case 2: *bits = 7; break;
1011                         case 3: *bits = 8; break;
1012                 }
1013 #ifndef CONFIG_BF54x
1014                 /* Set DLAB in LCR to Access DLL and DLH */
1015                 val = UART_GET_LCR(uart);
1016                 val |= DLAB;
1017                 UART_PUT_LCR(uart, val);
1018 #endif
1019
1020                 dll = UART_GET_DLL(uart);
1021                 dlh = UART_GET_DLH(uart);
1022
1023 #ifndef CONFIG_BF54x
1024                 /* Clear DLAB in LCR to Access THR RBR IER */
1025                 val = UART_GET_LCR(uart);
1026                 val &= ~DLAB;
1027                 UART_PUT_LCR(uart, val);
1028 #endif
1029
1030                 *baud = get_sclk() / (16*(dll | dlh << 8));
1031         }
1032         pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits);
1033 }
1034 #endif
1035
1036 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
1037 static struct uart_driver bfin_serial_reg;
1038
1039 static int __init
1040 bfin_serial_console_setup(struct console *co, char *options)
1041 {
1042         struct bfin_serial_port *uart;
1043 # ifdef CONFIG_SERIAL_BFIN_CONSOLE
1044         int baud = 57600;
1045         int bits = 8;
1046         int parity = 'n';
1047 #  ifdef CONFIG_SERIAL_BFIN_CTSRTS
1048         int flow = 'r';
1049 #  else
1050         int flow = 'n';
1051 #  endif
1052 # endif
1053
1054         /*
1055          * Check whether an invalid uart number has been specified, and
1056          * if so, search for the first available port that does have
1057          * console support.
1058          */
1059         if (co->index == -1 || co->index >= nr_ports)
1060                 co->index = 0;
1061         uart = &bfin_serial_ports[co->index];
1062
1063 # ifdef CONFIG_SERIAL_BFIN_CONSOLE
1064         if (options)
1065                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1066         else
1067                 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1068
1069         return uart_set_options(&uart->port, co, baud, parity, bits, flow);
1070 # else
1071         return 0;
1072 # endif
1073 }
1074 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1075                                  defined (CONFIG_EARLY_PRINTK) */
1076
1077 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1078 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1079 {
1080         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1081         while (!(UART_GET_LSR(uart) & THRE))
1082                 barrier();
1083         UART_PUT_CHAR(uart, ch);
1084         SSYNC();
1085 }
1086
1087 /*
1088  * Interrupts are disabled on entering
1089  */
1090 static void
1091 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1092 {
1093         struct bfin_serial_port *uart = &bfin_serial_ports[co->index];
1094         int flags = 0;
1095
1096         spin_lock_irqsave(&uart->port.lock, flags);
1097         uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1098         spin_unlock_irqrestore(&uart->port.lock, flags);
1099
1100 }
1101
1102 static struct console bfin_serial_console = {
1103         .name           = BFIN_SERIAL_NAME,
1104         .write          = bfin_serial_console_write,
1105         .device         = uart_console_device,
1106         .setup          = bfin_serial_console_setup,
1107         .flags          = CON_PRINTBUFFER,
1108         .index          = -1,
1109         .data           = &bfin_serial_reg,
1110 };
1111
1112 static int __init bfin_serial_rs_console_init(void)
1113 {
1114         bfin_serial_init_ports();
1115         register_console(&bfin_serial_console);
1116 #ifdef CONFIG_KGDB_UART
1117         kgdb_entry_state = 0;
1118         init_kgdb_uart();
1119 #endif
1120         return 0;
1121 }
1122 console_initcall(bfin_serial_rs_console_init);
1123
1124 #define BFIN_SERIAL_CONSOLE     &bfin_serial_console
1125 #else
1126 #define BFIN_SERIAL_CONSOLE     NULL
1127 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1128
1129
1130 #ifdef CONFIG_EARLY_PRINTK
1131 static __init void early_serial_putc(struct uart_port *port, int ch)
1132 {
1133         unsigned timeout = 0xffff;
1134         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1135
1136         while ((!(UART_GET_LSR(uart) & THRE)) && --timeout)
1137                 cpu_relax();
1138         UART_PUT_CHAR(uart, ch);
1139 }
1140
1141 static __init void early_serial_write(struct console *con, const char *s,
1142                                         unsigned int n)
1143 {
1144         struct bfin_serial_port *uart = &bfin_serial_ports[con->index];
1145         unsigned int i;
1146
1147         for (i = 0; i < n; i++, s++) {
1148                 if (*s == '\n')
1149                         early_serial_putc(&uart->port, '\r');
1150                 early_serial_putc(&uart->port, *s);
1151         }
1152 }
1153
1154 static struct __init console bfin_early_serial_console = {
1155         .name = "early_BFuart",
1156         .write = early_serial_write,
1157         .device = uart_console_device,
1158         .flags = CON_PRINTBUFFER,
1159         .setup = bfin_serial_console_setup,
1160         .index = -1,
1161         .data  = &bfin_serial_reg,
1162 };
1163
1164 struct console __init *bfin_earlyserial_init(unsigned int port,
1165                                                 unsigned int cflag)
1166 {
1167         struct bfin_serial_port *uart;
1168         struct ktermios t;
1169
1170         if (port == -1 || port >= nr_ports)
1171                 port = 0;
1172         bfin_serial_init_ports();
1173         bfin_early_serial_console.index = port;
1174         uart = &bfin_serial_ports[port];
1175         t.c_cflag = cflag;
1176         t.c_iflag = 0;
1177         t.c_oflag = 0;
1178         t.c_lflag = ICANON;
1179         t.c_line = port;
1180         bfin_serial_set_termios(&uart->port, &t, &t);
1181         return &bfin_early_serial_console;
1182 }
1183
1184 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1185
1186 static struct uart_driver bfin_serial_reg = {
1187         .owner                  = THIS_MODULE,
1188         .driver_name            = "bfin-uart",
1189         .dev_name               = BFIN_SERIAL_NAME,
1190         .major                  = BFIN_SERIAL_MAJOR,
1191         .minor                  = BFIN_SERIAL_MINOR,
1192         .nr                     = BFIN_UART_NR_PORTS,
1193         .cons                   = BFIN_SERIAL_CONSOLE,
1194 };
1195
1196 static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state)
1197 {
1198         struct bfin_serial_port *uart = platform_get_drvdata(dev);
1199
1200         if (uart)
1201                 uart_suspend_port(&bfin_serial_reg, &uart->port);
1202
1203         return 0;
1204 }
1205
1206 static int bfin_serial_resume(struct platform_device *dev)
1207 {
1208         struct bfin_serial_port *uart = platform_get_drvdata(dev);
1209
1210         if (uart)
1211                 uart_resume_port(&bfin_serial_reg, &uart->port);
1212
1213         return 0;
1214 }
1215
1216 static int bfin_serial_probe(struct platform_device *dev)
1217 {
1218         struct resource *res = dev->resource;
1219         int i;
1220
1221         for (i = 0; i < dev->num_resources; i++, res++)
1222                 if (res->flags & IORESOURCE_MEM)
1223                         break;
1224
1225         if (i < dev->num_resources) {
1226                 for (i = 0; i < nr_ports; i++, res++) {
1227                         if (bfin_serial_ports[i].port.mapbase != res->start)
1228                                 continue;
1229                         bfin_serial_ports[i].port.dev = &dev->dev;
1230                         uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1231                         platform_set_drvdata(dev, &bfin_serial_ports[i]);
1232                 }
1233         }
1234
1235         return 0;
1236 }
1237
1238 static int bfin_serial_remove(struct platform_device *pdev)
1239 {
1240         struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1241
1242
1243 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
1244         gpio_free(uart->cts_pin);
1245         gpio_free(uart->rts_pin);
1246 #endif
1247
1248         platform_set_drvdata(pdev, NULL);
1249
1250         if (uart)
1251                 uart_remove_one_port(&bfin_serial_reg, &uart->port);
1252
1253         return 0;
1254 }
1255
1256 static struct platform_driver bfin_serial_driver = {
1257         .probe          = bfin_serial_probe,
1258         .remove         = bfin_serial_remove,
1259         .suspend        = bfin_serial_suspend,
1260         .resume         = bfin_serial_resume,
1261         .driver         = {
1262                 .name   = "bfin-uart",
1263                 .owner  = THIS_MODULE,
1264         },
1265 };
1266
1267 static int __init bfin_serial_init(void)
1268 {
1269         int ret;
1270 #ifdef CONFIG_KGDB_UART
1271         struct bfin_serial_port *uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
1272         struct ktermios t;
1273 #endif
1274
1275         pr_info("Serial: Blackfin serial driver\n");
1276
1277         bfin_serial_init_ports();
1278
1279         ret = uart_register_driver(&bfin_serial_reg);
1280         if (ret == 0) {
1281                 bfin_serial_reg.tty_driver->set_ldisc = bfin_set_ldisc;
1282                 ret = platform_driver_register(&bfin_serial_driver);
1283                 if (ret) {
1284                         pr_debug("uart register failed\n");
1285                         uart_unregister_driver(&bfin_serial_reg);
1286                 }
1287         }
1288 #ifdef CONFIG_KGDB_UART
1289         if (uart->port.cons->index != CONFIG_KGDB_UART_PORT) {
1290                 request_irq(uart->port.irq, bfin_serial_rx_int,
1291                         IRQF_DISABLED, "BFIN_UART_RX", uart);
1292                 pr_info("Request irq for kgdb uart port\n");
1293 #ifdef CONFIG_BF54x
1294                 UART_SET_IER(uart, ERBFI);
1295 #else
1296                 UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
1297 #endif
1298                 SSYNC();
1299                 t.c_cflag = CS8|B57600;
1300                 t.c_iflag = 0;
1301                 t.c_oflag = 0;
1302                 t.c_lflag = ICANON;
1303                 t.c_line = CONFIG_KGDB_UART_PORT;
1304                 bfin_serial_set_termios(&uart->port, &t, &t);
1305         }
1306 #endif
1307         return ret;
1308 }
1309
1310 static void __exit bfin_serial_exit(void)
1311 {
1312         platform_driver_unregister(&bfin_serial_driver);
1313         uart_unregister_driver(&bfin_serial_reg);
1314 }
1315
1316 module_init(bfin_serial_init);
1317 module_exit(bfin_serial_exit);
1318
1319 MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>");
1320 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1321 MODULE_LICENSE("GPL");
1322 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);
1323 MODULE_ALIAS("platform:bfin-uart");