12b11da40b494661b4adc5128d1ba3a2c6ee6c38
[linux-2.6.git] / drivers / serial / bfin_5xx.c
1 /*
2  * Blackfin On-Chip Serial Driver
3  *
4  * Copyright 2006-2008 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 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
26         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
27 #include <linux/kgdb.h>
28 #include <asm/irq_regs.h>
29 #endif
30
31 #include <asm/gpio.h>
32 #include <mach/bfin_serial_5xx.h>
33
34 #ifdef CONFIG_SERIAL_BFIN_DMA
35 #include <linux/dma-mapping.h>
36 #include <asm/io.h>
37 #include <asm/irq.h>
38 #include <asm/cacheflush.h>
39 #endif
40
41 /* UART name and device definitions */
42 #define BFIN_SERIAL_NAME        "ttyBF"
43 #define BFIN_SERIAL_MAJOR       204
44 #define BFIN_SERIAL_MINOR       64
45
46 static struct bfin_serial_port bfin_serial_ports[BFIN_UART_NR_PORTS];
47 static int nr_active_ports = ARRAY_SIZE(bfin_serial_resource);
48
49 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
50         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
51
52 # ifndef CONFIG_SERIAL_BFIN_PIO
53 #  error KGDB only support UART in PIO mode.
54 # endif
55
56 static int kgdboc_port_line;
57 static int kgdboc_break_enabled;
58 #endif
59 /*
60  * Setup for console. Argument comes from the menuconfig
61  */
62 #define DMA_RX_XCOUNT           512
63 #define DMA_RX_YCOUNT           (PAGE_SIZE / DMA_RX_XCOUNT)
64
65 #define DMA_RX_FLUSH_JIFFIES    (HZ / 50)
66 #define CTS_CHECK_JIFFIES       (HZ / 50)
67
68 #ifdef CONFIG_SERIAL_BFIN_DMA
69 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart);
70 #else
71 static void bfin_serial_tx_chars(struct bfin_serial_port *uart);
72 #endif
73
74 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart);
75
76 static void bfin_serial_reset_irda(struct uart_port *port);
77
78 /*
79  * interrupts are disabled on entry
80  */
81 static void bfin_serial_stop_tx(struct uart_port *port)
82 {
83         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
84 #ifdef CONFIG_SERIAL_BFIN_DMA
85         struct circ_buf *xmit = &uart->port.info->xmit;
86 #endif
87
88         while (!(UART_GET_LSR(uart) & TEMT))
89                 cpu_relax();
90
91 #ifdef CONFIG_SERIAL_BFIN_DMA
92         disable_dma(uart->tx_dma_channel);
93         xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
94         uart->port.icount.tx += uart->tx_count;
95         uart->tx_count = 0;
96         uart->tx_done = 1;
97 #else
98 #ifdef CONFIG_BF54x
99         /* Clear TFI bit */
100         UART_PUT_LSR(uart, TFI);
101 #endif
102         UART_CLEAR_IER(uart, ETBEI);
103 #endif
104 }
105
106 /*
107  * port is locked and interrupts are disabled
108  */
109 static void bfin_serial_start_tx(struct uart_port *port)
110 {
111         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
112         struct tty_struct *tty = uart->port.info->port.tty;
113
114         /*
115          * To avoid losting RX interrupt, we reset IR function
116          * before sending data.
117          */
118         if (tty->termios->c_line == N_IRDA)
119                 bfin_serial_reset_irda(port);
120
121 #ifdef CONFIG_SERIAL_BFIN_DMA
122         if (uart->tx_done)
123                 bfin_serial_dma_tx_chars(uart);
124 #else
125         UART_SET_IER(uart, ETBEI);
126         bfin_serial_tx_chars(uart);
127 #endif
128 }
129
130 /*
131  * Interrupts are enabled
132  */
133 static void bfin_serial_stop_rx(struct uart_port *port)
134 {
135         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
136
137         UART_CLEAR_IER(uart, ERBFI);
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
148 #if ANOMALY_05000363 && defined(CONFIG_SERIAL_BFIN_PIO)
149 # define UART_GET_ANOMALY_THRESHOLD(uart)    ((uart)->anomaly_threshold)
150 # define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v))
151 #else
152 # define UART_GET_ANOMALY_THRESHOLD(uart)    0
153 # define UART_SET_ANOMALY_THRESHOLD(uart, v)
154 #endif
155
156 #ifdef CONFIG_SERIAL_BFIN_PIO
157 static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
158 {
159         struct tty_struct *tty = NULL;
160         unsigned int status, ch, flg;
161         static struct timeval anomaly_start = { .tv_sec = 0 };
162
163         status = UART_GET_LSR(uart);
164         UART_CLEAR_LSR(uart);
165
166         ch = UART_GET_CHAR(uart);
167         uart->port.icount.rx++;
168
169 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
170         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
171         if (kgdb_connected && kgdboc_port_line == uart->port.line)
172                 if (ch == 0x3) {/* Ctrl + C */
173                         kgdb_breakpoint();
174                         return;
175                 }
176
177         if (!uart->port.info || !uart->port.info->port.tty)
178                 return;
179 #endif
180         tty = uart->port.info->port.tty;
181
182         if (ANOMALY_05000363) {
183                 /* The BF533 (and BF561) family of processors have a nice anomaly
184                  * where they continuously generate characters for a "single" break.
185                  * We have to basically ignore this flood until the "next" valid
186                  * character comes across.  Due to the nature of the flood, it is
187                  * not possible to reliably catch bytes that are sent too quickly
188                  * after this break.  So application code talking to the Blackfin
189                  * which sends a break signal must allow at least 1.5 character
190                  * times after the end of the break for things to stabilize.  This
191                  * timeout was picked as it must absolutely be larger than 1
192                  * character time +/- some percent.  So 1.5 sounds good.  All other
193                  * Blackfin families operate properly.  Woo.
194                  */
195                 if (anomaly_start.tv_sec) {
196                         struct timeval curr;
197                         suseconds_t usecs;
198
199                         if ((~ch & (~ch + 1)) & 0xff)
200                                 goto known_good_char;
201
202                         do_gettimeofday(&curr);
203                         if (curr.tv_sec - anomaly_start.tv_sec > 1)
204                                 goto known_good_char;
205
206                         usecs = 0;
207                         if (curr.tv_sec != anomaly_start.tv_sec)
208                                 usecs += USEC_PER_SEC;
209                         usecs += curr.tv_usec - anomaly_start.tv_usec;
210
211                         if (usecs > UART_GET_ANOMALY_THRESHOLD(uart))
212                                 goto known_good_char;
213
214                         if (ch)
215                                 anomaly_start.tv_sec = 0;
216                         else
217                                 anomaly_start = curr;
218
219                         return;
220
221  known_good_char:
222                         status &= ~BI;
223                         anomaly_start.tv_sec = 0;
224                 }
225         }
226
227         if (status & BI) {
228                 if (ANOMALY_05000363)
229                         if (bfin_revid() < 5)
230                                 do_gettimeofday(&anomaly_start);
231                 uart->port.icount.brk++;
232                 if (uart_handle_break(&uart->port))
233                         goto ignore_char;
234                 status &= ~(PE | FE);
235         }
236         if (status & PE)
237                 uart->port.icount.parity++;
238         if (status & OE)
239                 uart->port.icount.overrun++;
240         if (status & FE)
241                 uart->port.icount.frame++;
242
243         status &= uart->port.read_status_mask;
244
245         if (status & BI)
246                 flg = TTY_BREAK;
247         else if (status & PE)
248                 flg = TTY_PARITY;
249         else if (status & FE)
250                 flg = TTY_FRAME;
251         else
252                 flg = TTY_NORMAL;
253
254         if (uart_handle_sysrq_char(&uart->port, ch))
255                 goto ignore_char;
256
257         uart_insert_char(&uart->port, status, OE, ch, flg);
258
259  ignore_char:
260         tty_flip_buffer_push(tty);
261 }
262
263 static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
264 {
265         struct circ_buf *xmit = &uart->port.info->xmit;
266
267         /*
268          * Check the modem control lines before
269          * transmitting anything.
270          */
271         bfin_serial_mctrl_check(uart);
272
273         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
274 #ifdef CONFIG_BF54x
275                 /* Clear TFI bit */
276                 UART_PUT_LSR(uart, TFI);
277 #endif
278                 UART_CLEAR_IER(uart, ETBEI);
279                 return;
280         }
281
282         if (uart->port.x_char) {
283                 UART_PUT_CHAR(uart, uart->port.x_char);
284                 uart->port.icount.tx++;
285                 uart->port.x_char = 0;
286         }
287
288         while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
289                 UART_PUT_CHAR(uart, xmit->buf[xmit->tail]);
290                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
291                 uart->port.icount.tx++;
292                 SSYNC();
293         }
294
295         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
296                 uart_write_wakeup(&uart->port);
297 }
298
299 static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
300 {
301         struct bfin_serial_port *uart = dev_id;
302
303         spin_lock(&uart->port.lock);
304         while (UART_GET_LSR(uart) & DR)
305                 bfin_serial_rx_chars(uart);
306         spin_unlock(&uart->port.lock);
307
308         return IRQ_HANDLED;
309 }
310
311 static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
312 {
313         struct bfin_serial_port *uart = dev_id;
314
315         spin_lock(&uart->port.lock);
316         if (UART_GET_LSR(uart) & THRE)
317                 bfin_serial_tx_chars(uart);
318         spin_unlock(&uart->port.lock);
319
320         return IRQ_HANDLED;
321 }
322 #endif
323
324 #ifdef CONFIG_SERIAL_BFIN_DMA
325 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
326 {
327         struct circ_buf *xmit = &uart->port.info->xmit;
328
329         uart->tx_done = 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                 uart->tx_count = 0;
339                 uart->tx_done = 1;
340                 return;
341         }
342
343         if (uart->port.x_char) {
344                 UART_PUT_CHAR(uart, uart->port.x_char);
345                 uart->port.icount.tx++;
346                 uart->port.x_char = 0;
347         }
348
349         uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
350         if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
351                 uart->tx_count = UART_XMIT_SIZE - xmit->tail;
352         blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
353                                         (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
354         set_dma_config(uart->tx_dma_channel,
355                 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
356                         INTR_ON_BUF,
357                         DIMENSION_LINEAR,
358                         DATA_SIZE_8,
359                         DMA_SYNC_RESTART));
360         set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
361         set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
362         set_dma_x_modify(uart->tx_dma_channel, 1);
363         enable_dma(uart->tx_dma_channel);
364
365         UART_SET_IER(uart, ETBEI);
366 }
367
368 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
369 {
370         struct tty_struct *tty = uart->port.info->port.tty;
371         int i, flg, status;
372
373         status = UART_GET_LSR(uart);
374         UART_CLEAR_LSR(uart);
375
376         uart->port.icount.rx +=
377                 CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail,
378                 UART_XMIT_SIZE);
379
380         if (status & BI) {
381                 uart->port.icount.brk++;
382                 if (uart_handle_break(&uart->port))
383                         goto dma_ignore_char;
384                 status &= ~(PE | FE);
385         }
386         if (status & PE)
387                 uart->port.icount.parity++;
388         if (status & OE)
389                 uart->port.icount.overrun++;
390         if (status & FE)
391                 uart->port.icount.frame++;
392
393         status &= uart->port.read_status_mask;
394
395         if (status & BI)
396                 flg = TTY_BREAK;
397         else if (status & PE)
398                 flg = TTY_PARITY;
399         else if (status & FE)
400                 flg = TTY_FRAME;
401         else
402                 flg = TTY_NORMAL;
403
404         for (i = uart->rx_dma_buf.tail; ; i++) {
405                 if (i >= UART_XMIT_SIZE)
406                         i = 0;
407                 if (i == uart->rx_dma_buf.head)
408                         break;
409                 if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
410                         uart_insert_char(&uart->port, status, OE,
411                                 uart->rx_dma_buf.buf[i], flg);
412         }
413
414  dma_ignore_char:
415         tty_flip_buffer_push(tty);
416 }
417
418 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
419 {
420         int x_pos, pos;
421         unsigned long flags;
422
423         spin_lock_irqsave(&uart->port.lock, flags);
424
425         uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
426         x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
427         uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
428         if (uart->rx_dma_nrows == DMA_RX_YCOUNT)
429                 uart->rx_dma_nrows = 0;
430         x_pos = DMA_RX_XCOUNT - x_pos;
431         if (x_pos == DMA_RX_XCOUNT)
432                 x_pos = 0;
433
434         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
435         if (pos != uart->rx_dma_buf.tail) {
436                 uart->rx_dma_buf.head = pos;
437                 bfin_serial_dma_rx_chars(uart);
438                 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
439         }
440
441         spin_unlock_irqrestore(&uart->port.lock, flags);
442
443         mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES);
444 }
445
446 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
447 {
448         struct bfin_serial_port *uart = dev_id;
449         struct circ_buf *xmit = &uart->port.info->xmit;
450
451         spin_lock(&uart->port.lock);
452         if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
453                 disable_dma(uart->tx_dma_channel);
454                 clear_dma_irqstat(uart->tx_dma_channel);
455                 UART_CLEAR_IER(uart, ETBEI);
456                 xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
457                 uart->port.icount.tx += uart->tx_count;
458
459                 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
460                         uart_write_wakeup(&uart->port);
461
462                 bfin_serial_dma_tx_chars(uart);
463         }
464
465         spin_unlock(&uart->port.lock);
466         return IRQ_HANDLED;
467 }
468
469 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
470 {
471         struct bfin_serial_port *uart = dev_id;
472         unsigned short irqstat;
473
474         spin_lock(&uart->port.lock);
475         irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
476         clear_dma_irqstat(uart->rx_dma_channel);
477         bfin_serial_dma_rx_chars(uart);
478         spin_unlock(&uart->port.lock);
479
480         return IRQ_HANDLED;
481 }
482 #endif
483
484 /*
485  * Return TIOCSER_TEMT when transmitter is not busy.
486  */
487 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
488 {
489         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
490         unsigned short lsr;
491
492         lsr = UART_GET_LSR(uart);
493         if (lsr & TEMT)
494                 return TIOCSER_TEMT;
495         else
496                 return 0;
497 }
498
499 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
500 {
501 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
502         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
503         if (uart->cts_pin < 0)
504                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
505
506         if (UART_GET_CTS(uart))
507                 return TIOCM_DSR | TIOCM_CAR;
508         else
509 #endif
510                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
511 }
512
513 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
514 {
515 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
516         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
517         if (uart->rts_pin < 0)
518                 return;
519
520         if (mctrl & TIOCM_RTS)
521                 UART_CLEAR_RTS(uart);
522         else
523                 UART_SET_RTS(uart);
524 #endif
525 }
526
527 /*
528  * Handle any change of modem status signal since we were last called.
529  */
530 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart)
531 {
532 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
533         unsigned int status;
534         struct uart_info *info = uart->port.info;
535         struct tty_struct *tty = info->port.tty;
536
537         status = bfin_serial_get_mctrl(&uart->port);
538         uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
539         if (!(status & TIOCM_CTS)) {
540                 tty->hw_stopped = 1;
541                 uart->cts_timer.data = (unsigned long)(uart);
542                 uart->cts_timer.function = (void *)bfin_serial_mctrl_check;
543                 uart->cts_timer.expires = jiffies + CTS_CHECK_JIFFIES;
544                 add_timer(&(uart->cts_timer));
545         } else {
546                 tty->hw_stopped = 0;
547         }
548 #endif
549 }
550
551 /*
552  * Interrupts are always disabled.
553  */
554 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
555 {
556         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
557         u16 lcr = UART_GET_LCR(uart);
558         if (break_state)
559                 lcr |= SB;
560         else
561                 lcr &= ~SB;
562         UART_PUT_LCR(uart, lcr);
563         SSYNC();
564 }
565
566 static int bfin_serial_startup(struct uart_port *port)
567 {
568         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
569
570 #ifdef CONFIG_SERIAL_BFIN_DMA
571         dma_addr_t dma_handle;
572
573         if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
574                 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
575                 return -EBUSY;
576         }
577
578         if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
579                 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
580                 free_dma(uart->rx_dma_channel);
581                 return -EBUSY;
582         }
583
584         set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
585         set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
586
587         uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
588         uart->rx_dma_buf.head = 0;
589         uart->rx_dma_buf.tail = 0;
590         uart->rx_dma_nrows = 0;
591
592         set_dma_config(uart->rx_dma_channel,
593                 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
594                                 INTR_ON_ROW, DIMENSION_2D,
595                                 DATA_SIZE_8,
596                                 DMA_SYNC_RESTART));
597         set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
598         set_dma_x_modify(uart->rx_dma_channel, 1);
599         set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
600         set_dma_y_modify(uart->rx_dma_channel, 1);
601         set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
602         enable_dma(uart->rx_dma_channel);
603
604         uart->rx_dma_timer.data = (unsigned long)(uart);
605         uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
606         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
607         add_timer(&(uart->rx_dma_timer));
608 #else
609 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
610         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
611         if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled)
612                 kgdboc_break_enabled = 0;
613         else {
614 # endif
615         if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
616              "BFIN_UART_RX", uart)) {
617                 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
618                 return -EBUSY;
619         }
620
621         if (request_irq
622             (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED,
623              "BFIN_UART_TX", uart)) {
624                 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
625                 free_irq(uart->port.irq, uart);
626                 return -EBUSY;
627         }
628
629 # ifdef CONFIG_BF54x
630         {
631                 unsigned uart_dma_ch_rx, uart_dma_ch_tx;
632
633                 switch (uart->port.irq) {
634                 case IRQ_UART3_RX:
635                         uart_dma_ch_rx = CH_UART3_RX;
636                         uart_dma_ch_tx = CH_UART3_TX;
637                         break;
638                 case IRQ_UART2_RX:
639                         uart_dma_ch_rx = CH_UART2_RX;
640                         uart_dma_ch_tx = CH_UART2_TX;
641                         break;
642                 default:
643                         uart_dma_ch_rx = uart_dma_ch_tx = 0;
644                         break;
645                 };
646
647                 if (uart_dma_ch_rx &&
648                         request_dma(uart_dma_ch_rx, "BFIN_UART_RX") < 0) {
649                         printk(KERN_NOTICE"Fail to attach UART interrupt\n");
650                         free_irq(uart->port.irq, uart);
651                         free_irq(uart->port.irq + 1, uart);
652                         return -EBUSY;
653                 }
654                 if (uart_dma_ch_tx &&
655                         request_dma(uart_dma_ch_tx, "BFIN_UART_TX") < 0) {
656                         printk(KERN_NOTICE "Fail to attach UART interrupt\n");
657                         free_dma(uart_dma_ch_rx);
658                         free_irq(uart->port.irq, uart);
659                         free_irq(uart->port.irq + 1, uart);
660                         return -EBUSY;
661                 }
662         }
663 # endif
664 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
665         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
666         }
667 # endif
668 #endif
669         UART_SET_IER(uart, ERBFI);
670         return 0;
671 }
672
673 static void bfin_serial_shutdown(struct uart_port *port)
674 {
675         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
676
677 #ifdef CONFIG_SERIAL_BFIN_DMA
678         disable_dma(uart->tx_dma_channel);
679         free_dma(uart->tx_dma_channel);
680         disable_dma(uart->rx_dma_channel);
681         free_dma(uart->rx_dma_channel);
682         del_timer(&(uart->rx_dma_timer));
683         dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
684 #else
685 #ifdef CONFIG_BF54x
686         switch (uart->port.irq) {
687         case IRQ_UART3_RX:
688                 free_dma(CH_UART3_RX);
689                 free_dma(CH_UART3_TX);
690                 break;
691         case IRQ_UART2_RX:
692                 free_dma(CH_UART2_RX);
693                 free_dma(CH_UART2_TX);
694                 break;
695         default:
696                 break;
697         };
698 #endif
699         free_irq(uart->port.irq, uart);
700         free_irq(uart->port.irq+1, uart);
701 #endif
702 }
703
704 static void
705 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
706                    struct ktermios *old)
707 {
708         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
709         unsigned long flags;
710         unsigned int baud, quot;
711         unsigned short val, ier, lcr = 0;
712
713         switch (termios->c_cflag & CSIZE) {
714         case CS8:
715                 lcr = WLS(8);
716                 break;
717         case CS7:
718                 lcr = WLS(7);
719                 break;
720         case CS6:
721                 lcr = WLS(6);
722                 break;
723         case CS5:
724                 lcr = WLS(5);
725                 break;
726         default:
727                 printk(KERN_ERR "%s: word lengh not supported\n",
728                         __func__);
729         }
730
731         if (termios->c_cflag & CSTOPB)
732                 lcr |= STB;
733         if (termios->c_cflag & PARENB)
734                 lcr |= PEN;
735         if (!(termios->c_cflag & PARODD))
736                 lcr |= EPS;
737         if (termios->c_cflag & CMSPAR)
738                 lcr |= STP;
739
740         port->read_status_mask = OE;
741         if (termios->c_iflag & INPCK)
742                 port->read_status_mask |= (FE | PE);
743         if (termios->c_iflag & (BRKINT | PARMRK))
744                 port->read_status_mask |= BI;
745
746         /*
747          * Characters to ignore
748          */
749         port->ignore_status_mask = 0;
750         if (termios->c_iflag & IGNPAR)
751                 port->ignore_status_mask |= FE | PE;
752         if (termios->c_iflag & IGNBRK) {
753                 port->ignore_status_mask |= BI;
754                 /*
755                  * If we're ignoring parity and break indicators,
756                  * ignore overruns too (for real raw support).
757                  */
758                 if (termios->c_iflag & IGNPAR)
759                         port->ignore_status_mask |= OE;
760         }
761
762         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
763         quot = uart_get_divisor(port, baud);
764         spin_lock_irqsave(&uart->port.lock, flags);
765
766         UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
767
768         /* Disable UART */
769         ier = UART_GET_IER(uart);
770         UART_DISABLE_INTS(uart);
771
772         /* Set DLAB in LCR to Access DLL and DLH */
773         UART_SET_DLAB(uart);
774
775         UART_PUT_DLL(uart, quot & 0xFF);
776         UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
777         SSYNC();
778
779         /* Clear DLAB in LCR to Access THR RBR IER */
780         UART_CLEAR_DLAB(uart);
781
782         UART_PUT_LCR(uart, lcr);
783
784         /* Enable UART */
785         UART_ENABLE_INTS(uart, ier);
786
787         val = UART_GET_GCTL(uart);
788         val |= UCEN;
789         UART_PUT_GCTL(uart, val);
790
791         /* Port speed changed, update the per-port timeout. */
792         uart_update_timeout(port, termios->c_cflag, baud);
793
794         spin_unlock_irqrestore(&uart->port.lock, flags);
795 }
796
797 static const char *bfin_serial_type(struct uart_port *port)
798 {
799         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
800
801         return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
802 }
803
804 /*
805  * Release the memory region(s) being used by 'port'.
806  */
807 static void bfin_serial_release_port(struct uart_port *port)
808 {
809 }
810
811 /*
812  * Request the memory region(s) being used by 'port'.
813  */
814 static int bfin_serial_request_port(struct uart_port *port)
815 {
816         return 0;
817 }
818
819 /*
820  * Configure/autoconfigure the port.
821  */
822 static void bfin_serial_config_port(struct uart_port *port, int flags)
823 {
824         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
825
826         if (flags & UART_CONFIG_TYPE &&
827             bfin_serial_request_port(&uart->port) == 0)
828                 uart->port.type = PORT_BFIN;
829 }
830
831 /*
832  * Verify the new serial_struct (for TIOCSSERIAL).
833  * The only change we allow are to the flags and type, and
834  * even then only between PORT_BFIN and PORT_UNKNOWN
835  */
836 static int
837 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
838 {
839         return 0;
840 }
841
842 /*
843  * Enable the IrDA function if tty->ldisc.num is N_IRDA.
844  * In other cases, disable IrDA function.
845  */
846 static void bfin_serial_set_ldisc(struct uart_port *port)
847 {
848         int line = port->line;
849         unsigned short val;
850
851         if (line >= port->info->port.tty->driver->num)
852                 return;
853
854         switch (port->info->port.tty->termios->c_line) {
855         case N_IRDA:
856                 val = UART_GET_GCTL(&bfin_serial_ports[line]);
857                 val |= (IREN | RPOLC);
858                 UART_PUT_GCTL(&bfin_serial_ports[line], val);
859                 break;
860         default:
861                 val = UART_GET_GCTL(&bfin_serial_ports[line]);
862                 val &= ~(IREN | RPOLC);
863                 UART_PUT_GCTL(&bfin_serial_ports[line], val);
864         }
865 }
866
867 #ifdef CONFIG_CONSOLE_POLL
868 static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr)
869 {
870         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
871
872         while (!(UART_GET_LSR(uart) & THRE))
873                 cpu_relax();
874
875         UART_CLEAR_DLAB(uart);
876         UART_PUT_CHAR(uart, (unsigned char)chr);
877 }
878
879 static int bfin_serial_poll_get_char(struct uart_port *port)
880 {
881         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
882         unsigned char chr;
883
884         while (!(UART_GET_LSR(uart) & DR))
885                 cpu_relax();
886
887         UART_CLEAR_DLAB(uart);
888         chr = UART_GET_CHAR(uart);
889
890         return chr;
891 }
892 #endif
893
894 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
895         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
896 static void bfin_kgdboc_port_shutdown(struct uart_port *port)
897 {
898         if (kgdboc_break_enabled) {
899                 kgdboc_break_enabled = 0;
900                 bfin_serial_shutdown(port);
901         }
902 }
903
904 static int bfin_kgdboc_port_startup(struct uart_port *port)
905 {
906         kgdboc_port_line = port->line;
907         kgdboc_break_enabled = !bfin_serial_startup(port);
908         return 0;
909 }
910 #endif
911
912 static void bfin_serial_reset_irda(struct uart_port *port)
913 {
914         int line = port->line;
915         unsigned short val;
916
917         val = UART_GET_GCTL(&bfin_serial_ports[line]);
918         val &= ~(IREN | RPOLC);
919         UART_PUT_GCTL(&bfin_serial_ports[line], val);
920         SSYNC();
921         val |= (IREN | RPOLC);
922         UART_PUT_GCTL(&bfin_serial_ports[line], val);
923         SSYNC();
924 }
925
926 static struct uart_ops bfin_serial_pops = {
927         .tx_empty       = bfin_serial_tx_empty,
928         .set_mctrl      = bfin_serial_set_mctrl,
929         .get_mctrl      = bfin_serial_get_mctrl,
930         .stop_tx        = bfin_serial_stop_tx,
931         .start_tx       = bfin_serial_start_tx,
932         .stop_rx        = bfin_serial_stop_rx,
933         .enable_ms      = bfin_serial_enable_ms,
934         .break_ctl      = bfin_serial_break_ctl,
935         .startup        = bfin_serial_startup,
936         .shutdown       = bfin_serial_shutdown,
937         .set_termios    = bfin_serial_set_termios,
938         .set_ldisc      = bfin_serial_set_ldisc,
939         .type           = bfin_serial_type,
940         .release_port   = bfin_serial_release_port,
941         .request_port   = bfin_serial_request_port,
942         .config_port    = bfin_serial_config_port,
943         .verify_port    = bfin_serial_verify_port,
944 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
945         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
946         .kgdboc_port_startup    = bfin_kgdboc_port_startup,
947         .kgdboc_port_shutdown   = bfin_kgdboc_port_shutdown,
948 #endif
949 #ifdef CONFIG_CONSOLE_POLL
950         .poll_put_char  = bfin_serial_poll_put_char,
951         .poll_get_char  = bfin_serial_poll_get_char,
952 #endif
953 };
954
955 static void __init bfin_serial_init_ports(void)
956 {
957         static int first = 1;
958         int i;
959
960         if (!first)
961                 return;
962         first = 0;
963
964         for (i = 0; i < nr_active_ports; i++) {
965                 bfin_serial_ports[i].port.uartclk   = get_sclk();
966                 bfin_serial_ports[i].port.fifosize  = BFIN_UART_TX_FIFO_SIZE;
967                 bfin_serial_ports[i].port.ops       = &bfin_serial_pops;
968                 bfin_serial_ports[i].port.line      = i;
969                 bfin_serial_ports[i].port.iotype    = UPIO_MEM;
970                 bfin_serial_ports[i].port.membase   =
971                         (void __iomem *)bfin_serial_resource[i].uart_base_addr;
972                 bfin_serial_ports[i].port.mapbase   =
973                         bfin_serial_resource[i].uart_base_addr;
974                 bfin_serial_ports[i].port.irq       =
975                         bfin_serial_resource[i].uart_irq;
976                 bfin_serial_ports[i].port.flags     = UPF_BOOT_AUTOCONF;
977 #ifdef CONFIG_SERIAL_BFIN_DMA
978                 bfin_serial_ports[i].tx_done        = 1;
979                 bfin_serial_ports[i].tx_count       = 0;
980                 bfin_serial_ports[i].tx_dma_channel =
981                         bfin_serial_resource[i].uart_tx_dma_channel;
982                 bfin_serial_ports[i].rx_dma_channel =
983                         bfin_serial_resource[i].uart_rx_dma_channel;
984                 init_timer(&(bfin_serial_ports[i].rx_dma_timer));
985 #endif
986 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
987                 init_timer(&(bfin_serial_ports[i].cts_timer));
988                 bfin_serial_ports[i].cts_pin        =
989                         bfin_serial_resource[i].uart_cts_pin;
990                 bfin_serial_ports[i].rts_pin        =
991                         bfin_serial_resource[i].uart_rts_pin;
992 #endif
993                 bfin_serial_hw_init(&bfin_serial_ports[i]);
994         }
995
996 }
997
998 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
999 /*
1000  * If the port was already initialised (eg, by a boot loader),
1001  * try to determine the current setup.
1002  */
1003 static void __init
1004 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
1005                            int *parity, int *bits)
1006 {
1007         unsigned short status;
1008
1009         status = UART_GET_IER(uart) & (ERBFI | ETBEI);
1010         if (status == (ERBFI | ETBEI)) {
1011                 /* ok, the port was enabled */
1012                 u16 lcr, dlh, dll;
1013
1014                 lcr = UART_GET_LCR(uart);
1015
1016                 *parity = 'n';
1017                 if (lcr & PEN) {
1018                         if (lcr & EPS)
1019                                 *parity = 'e';
1020                         else
1021                                 *parity = 'o';
1022                 }
1023                 switch (lcr & 0x03) {
1024                         case 0: *bits = 5; break;
1025                         case 1: *bits = 6; break;
1026                         case 2: *bits = 7; break;
1027                         case 3: *bits = 8; break;
1028                 }
1029                 /* Set DLAB in LCR to Access DLL and DLH */
1030                 UART_SET_DLAB(uart);
1031
1032                 dll = UART_GET_DLL(uart);
1033                 dlh = UART_GET_DLH(uart);
1034
1035                 /* Clear DLAB in LCR to Access THR RBR IER */
1036                 UART_CLEAR_DLAB(uart);
1037
1038                 *baud = get_sclk() / (16*(dll | dlh << 8));
1039         }
1040         pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits);
1041 }
1042
1043 static struct uart_driver bfin_serial_reg;
1044
1045 static int __init
1046 bfin_serial_console_setup(struct console *co, char *options)
1047 {
1048         struct bfin_serial_port *uart;
1049         int baud = 57600;
1050         int bits = 8;
1051         int parity = 'n';
1052 # ifdef CONFIG_SERIAL_BFIN_CTSRTS
1053         int flow = 'r';
1054 # else
1055         int flow = 'n';
1056 # endif
1057
1058         /*
1059          * Check whether an invalid uart number has been specified, and
1060          * if so, search for the first available port that does have
1061          * console support.
1062          */
1063         if (co->index == -1 || co->index >= nr_active_ports)
1064                 co->index = 0;
1065         uart = &bfin_serial_ports[co->index];
1066
1067         if (options)
1068                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1069         else
1070                 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1071
1072         return uart_set_options(&uart->port, co, baud, parity, bits, flow);
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         unsigned long flags;
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
1117         return 0;
1118 }
1119 console_initcall(bfin_serial_rs_console_init);
1120
1121 #define BFIN_SERIAL_CONSOLE     &bfin_serial_console
1122 #else
1123 #define BFIN_SERIAL_CONSOLE     NULL
1124 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1125
1126
1127 #ifdef CONFIG_EARLY_PRINTK
1128 static __init void early_serial_putc(struct uart_port *port, int ch)
1129 {
1130         unsigned timeout = 0xffff;
1131         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1132
1133         while ((!(UART_GET_LSR(uart) & THRE)) && --timeout)
1134                 cpu_relax();
1135         UART_PUT_CHAR(uart, ch);
1136 }
1137
1138 static __init void early_serial_write(struct console *con, const char *s,
1139                                         unsigned int n)
1140 {
1141         struct bfin_serial_port *uart = &bfin_serial_ports[con->index];
1142         unsigned int i;
1143
1144         for (i = 0; i < n; i++, s++) {
1145                 if (*s == '\n')
1146                         early_serial_putc(&uart->port, '\r');
1147                 early_serial_putc(&uart->port, *s);
1148         }
1149 }
1150
1151 static struct __initdata console bfin_early_serial_console = {
1152         .name = "early_BFuart",
1153         .write = early_serial_write,
1154         .device = uart_console_device,
1155         .flags = CON_PRINTBUFFER,
1156         .setup = bfin_serial_console_setup,
1157         .index = -1,
1158         .data  = &bfin_serial_reg,
1159 };
1160
1161 struct console __init *bfin_earlyserial_init(unsigned int port,
1162                                                 unsigned int cflag)
1163 {
1164         struct bfin_serial_port *uart;
1165         struct ktermios t;
1166
1167         if (port == -1 || port >= nr_active_ports)
1168                 port = 0;
1169         bfin_serial_init_ports();
1170         bfin_early_serial_console.index = port;
1171         uart = &bfin_serial_ports[port];
1172         t.c_cflag = cflag;
1173         t.c_iflag = 0;
1174         t.c_oflag = 0;
1175         t.c_lflag = ICANON;
1176         t.c_line = port;
1177         bfin_serial_set_termios(&uart->port, &t, &t);
1178         return &bfin_early_serial_console;
1179 }
1180
1181 #endif /* CONFIG_EARLY_PRINTK */
1182
1183 static struct uart_driver bfin_serial_reg = {
1184         .owner                  = THIS_MODULE,
1185         .driver_name            = "bfin-uart",
1186         .dev_name               = BFIN_SERIAL_NAME,
1187         .major                  = BFIN_SERIAL_MAJOR,
1188         .minor                  = BFIN_SERIAL_MINOR,
1189         .nr                     = BFIN_UART_NR_PORTS,
1190         .cons                   = BFIN_SERIAL_CONSOLE,
1191 };
1192
1193 static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state)
1194 {
1195         int i;
1196
1197         for (i = 0; i < nr_active_ports; i++) {
1198                 if (bfin_serial_ports[i].port.dev != &dev->dev)
1199                         continue;
1200                 uart_suspend_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1201         }
1202
1203         return 0;
1204 }
1205
1206 static int bfin_serial_resume(struct platform_device *dev)
1207 {
1208         int i;
1209
1210         for (i = 0; i < nr_active_ports; i++) {
1211                 if (bfin_serial_ports[i].port.dev != &dev->dev)
1212                         continue;
1213                 uart_resume_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1214         }
1215
1216         return 0;
1217 }
1218
1219 static int bfin_serial_probe(struct platform_device *dev)
1220 {
1221         struct resource *res = dev->resource;
1222         int i;
1223
1224         for (i = 0; i < dev->num_resources; i++, res++)
1225                 if (res->flags & IORESOURCE_MEM)
1226                         break;
1227
1228         if (i < dev->num_resources) {
1229                 for (i = 0; i < nr_active_ports; i++, res++) {
1230                         if (bfin_serial_ports[i].port.mapbase != res->start)
1231                                 continue;
1232                         bfin_serial_ports[i].port.dev = &dev->dev;
1233                         uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1234                 }
1235         }
1236
1237         return 0;
1238 }
1239
1240 static int bfin_serial_remove(struct platform_device *dev)
1241 {
1242         int i;
1243
1244         for (i = 0; i < nr_active_ports; i++) {
1245                 if (bfin_serial_ports[i].port.dev != &dev->dev)
1246                         continue;
1247                 uart_remove_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1248                 bfin_serial_ports[i].port.dev = NULL;
1249 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
1250                 gpio_free(bfin_serial_ports[i].cts_pin);
1251                 gpio_free(bfin_serial_ports[i].rts_pin);
1252 #endif
1253         }
1254
1255         return 0;
1256 }
1257
1258 static struct platform_driver bfin_serial_driver = {
1259         .probe          = bfin_serial_probe,
1260         .remove         = bfin_serial_remove,
1261         .suspend        = bfin_serial_suspend,
1262         .resume         = bfin_serial_resume,
1263         .driver         = {
1264                 .name   = "bfin-uart",
1265                 .owner  = THIS_MODULE,
1266         },
1267 };
1268
1269 static int __init bfin_serial_init(void)
1270 {
1271         int ret;
1272
1273         pr_info("Serial: Blackfin serial driver\n");
1274
1275         bfin_serial_init_ports();
1276
1277         ret = uart_register_driver(&bfin_serial_reg);
1278         if (ret == 0) {
1279                 ret = platform_driver_register(&bfin_serial_driver);
1280                 if (ret) {
1281                         pr_debug("uart register failed\n");
1282                         uart_unregister_driver(&bfin_serial_reg);
1283                 }
1284         }
1285         return ret;
1286 }
1287
1288 static void __exit bfin_serial_exit(void)
1289 {
1290         platform_driver_unregister(&bfin_serial_driver);
1291         uart_unregister_driver(&bfin_serial_reg);
1292 }
1293
1294
1295 module_init(bfin_serial_init);
1296 module_exit(bfin_serial_exit);
1297
1298 MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>");
1299 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1300 MODULE_LICENSE("GPL");
1301 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);
1302 MODULE_ALIAS("platform:bfin-uart");