Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-2.6] / 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->tty)
178                 return;
179 #endif
180         tty = uart->port.info->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 != uart->rx_dma_buf.head; i++) {
405                 if (i >= UART_XMIT_SIZE)
406                         i = 0;
407                 if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
408                         uart_insert_char(&uart->port, status, OE,
409                                 uart->rx_dma_buf.buf[i], flg);
410         }
411
412  dma_ignore_char:
413         tty_flip_buffer_push(tty);
414 }
415
416 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
417 {
418         int x_pos, pos, flags;
419
420         spin_lock_irqsave(&uart->port.lock, flags);
421
422         uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
423         x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
424         uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
425         if (uart->rx_dma_nrows == DMA_RX_YCOUNT)
426                 uart->rx_dma_nrows = 0;
427         x_pos = DMA_RX_XCOUNT - x_pos;
428         if (x_pos == DMA_RX_XCOUNT)
429                 x_pos = 0;
430
431         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
432         if (pos != uart->rx_dma_buf.tail) {
433                 uart->rx_dma_buf.head = pos;
434                 bfin_serial_dma_rx_chars(uart);
435                 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
436         }
437
438         spin_unlock_irqrestore(&uart->port.lock, flags);
439
440         mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES);
441 }
442
443 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
444 {
445         struct bfin_serial_port *uart = dev_id;
446         struct circ_buf *xmit = &uart->port.info->xmit;
447
448         spin_lock(&uart->port.lock);
449         if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
450                 disable_dma(uart->tx_dma_channel);
451                 clear_dma_irqstat(uart->tx_dma_channel);
452                 UART_CLEAR_IER(uart, ETBEI);
453                 xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
454                 uart->port.icount.tx += uart->tx_count;
455
456                 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
457                         uart_write_wakeup(&uart->port);
458
459                 bfin_serial_dma_tx_chars(uart);
460         }
461
462         spin_unlock(&uart->port.lock);
463         return IRQ_HANDLED;
464 }
465
466 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
467 {
468         struct bfin_serial_port *uart = dev_id;
469         unsigned short irqstat;
470
471         spin_lock(&uart->port.lock);
472         irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
473         clear_dma_irqstat(uart->rx_dma_channel);
474         bfin_serial_dma_rx_chars(uart);
475         spin_unlock(&uart->port.lock);
476
477         return IRQ_HANDLED;
478 }
479 #endif
480
481 /*
482  * Return TIOCSER_TEMT when transmitter is not busy.
483  */
484 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
485 {
486         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
487         unsigned short lsr;
488
489         lsr = UART_GET_LSR(uart);
490         if (lsr & TEMT)
491                 return TIOCSER_TEMT;
492         else
493                 return 0;
494 }
495
496 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
497 {
498 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
499         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
500         if (uart->cts_pin < 0)
501                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
502
503         if (UART_GET_CTS(uart))
504                 return TIOCM_DSR | TIOCM_CAR;
505         else
506 #endif
507                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
508 }
509
510 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
511 {
512 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
513         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
514         if (uart->rts_pin < 0)
515                 return;
516
517         if (mctrl & TIOCM_RTS)
518                 UART_CLEAR_RTS(uart);
519         else
520                 UART_SET_RTS(uart);
521 #endif
522 }
523
524 /*
525  * Handle any change of modem status signal since we were last called.
526  */
527 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart)
528 {
529 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
530         unsigned int status;
531         struct uart_info *info = uart->port.info;
532         struct tty_struct *tty = info->port.tty;
533
534         status = bfin_serial_get_mctrl(&uart->port);
535         uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
536         if (!(status & TIOCM_CTS)) {
537                 tty->hw_stopped = 1;
538                 uart->cts_timer.data = (unsigned long)(uart);
539                 uart->cts_timer.function = (void *)bfin_serial_mctrl_check;
540                 uart->cts_timer.expires = jiffies + CTS_CHECK_JIFFIES;
541                 add_timer(&(uart->cts_timer));
542         } else {
543                 tty->hw_stopped = 0;
544         }
545 #endif
546 }
547
548 /*
549  * Interrupts are always disabled.
550  */
551 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
552 {
553         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
554         u16 lcr = UART_GET_LCR(uart);
555         if (break_state)
556                 lcr |= SB;
557         else
558                 lcr &= ~SB;
559         UART_PUT_LCR(uart, lcr);
560         SSYNC();
561 }
562
563 static int bfin_serial_startup(struct uart_port *port)
564 {
565         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
566
567 #ifdef CONFIG_SERIAL_BFIN_DMA
568         dma_addr_t dma_handle;
569
570         if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
571                 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
572                 return -EBUSY;
573         }
574
575         if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
576                 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
577                 free_dma(uart->rx_dma_channel);
578                 return -EBUSY;
579         }
580
581         set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
582         set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
583
584         uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
585         uart->rx_dma_buf.head = 0;
586         uart->rx_dma_buf.tail = 0;
587         uart->rx_dma_nrows = 0;
588
589         set_dma_config(uart->rx_dma_channel,
590                 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
591                                 INTR_ON_ROW, DIMENSION_2D,
592                                 DATA_SIZE_8,
593                                 DMA_SYNC_RESTART));
594         set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
595         set_dma_x_modify(uart->rx_dma_channel, 1);
596         set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
597         set_dma_y_modify(uart->rx_dma_channel, 1);
598         set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
599         enable_dma(uart->rx_dma_channel);
600
601         uart->rx_dma_timer.data = (unsigned long)(uart);
602         uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
603         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
604         add_timer(&(uart->rx_dma_timer));
605 #else
606 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
607         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
608         if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled)
609                 kgdboc_break_enabled = 0;
610         else {
611 # endif
612         if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
613              "BFIN_UART_RX", uart)) {
614                 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
615                 return -EBUSY;
616         }
617
618         if (request_irq
619             (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED,
620              "BFIN_UART_TX", uart)) {
621                 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
622                 free_irq(uart->port.irq, uart);
623                 return -EBUSY;
624         }
625
626 # ifdef CONFIG_BF54x
627         {
628                 unsigned uart_dma_ch_rx, uart_dma_ch_tx;
629
630                 switch (uart->port.irq) {
631                 case IRQ_UART3_RX:
632                         uart_dma_ch_rx = CH_UART3_RX;
633                         uart_dma_ch_tx = CH_UART3_TX;
634                         break;
635                 case IRQ_UART2_RX:
636                         uart_dma_ch_rx = CH_UART2_RX;
637                         uart_dma_ch_tx = CH_UART2_TX;
638                         break;
639                 default:
640                         uart_dma_ch_rx = uart_dma_ch_tx = 0;
641                         break;
642                 };
643
644                 if (uart_dma_ch_rx &&
645                         request_dma(uart_dma_ch_rx, "BFIN_UART_RX") < 0) {
646                         printk(KERN_NOTICE"Fail to attach UART interrupt\n");
647                         free_irq(uart->port.irq, uart);
648                         free_irq(uart->port.irq + 1, uart);
649                         return -EBUSY;
650                 }
651                 if (uart_dma_ch_tx &&
652                         request_dma(uart_dma_ch_tx, "BFIN_UART_TX") < 0) {
653                         printk(KERN_NOTICE "Fail to attach UART interrupt\n");
654                         free_dma(uart_dma_ch_rx);
655                         free_irq(uart->port.irq, uart);
656                         free_irq(uart->port.irq + 1, uart);
657                         return -EBUSY;
658                 }
659         }
660 # endif
661 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
662         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
663         }
664 # endif
665 #endif
666         UART_SET_IER(uart, ERBFI);
667         return 0;
668 }
669
670 static void bfin_serial_shutdown(struct uart_port *port)
671 {
672         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
673
674 #ifdef CONFIG_SERIAL_BFIN_DMA
675         disable_dma(uart->tx_dma_channel);
676         free_dma(uart->tx_dma_channel);
677         disable_dma(uart->rx_dma_channel);
678         free_dma(uart->rx_dma_channel);
679         del_timer(&(uart->rx_dma_timer));
680         dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
681 #else
682 #ifdef CONFIG_BF54x
683         switch (uart->port.irq) {
684         case IRQ_UART3_RX:
685                 free_dma(CH_UART3_RX);
686                 free_dma(CH_UART3_TX);
687                 break;
688         case IRQ_UART2_RX:
689                 free_dma(CH_UART2_RX);
690                 free_dma(CH_UART2_TX);
691                 break;
692         default:
693                 break;
694         };
695 #endif
696         free_irq(uart->port.irq, uart);
697         free_irq(uart->port.irq+1, uart);
698 #endif
699 }
700
701 static void
702 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
703                    struct ktermios *old)
704 {
705         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
706         unsigned long flags;
707         unsigned int baud, quot;
708         unsigned short val, ier, lcr = 0;
709
710         switch (termios->c_cflag & CSIZE) {
711         case CS8:
712                 lcr = WLS(8);
713                 break;
714         case CS7:
715                 lcr = WLS(7);
716                 break;
717         case CS6:
718                 lcr = WLS(6);
719                 break;
720         case CS5:
721                 lcr = WLS(5);
722                 break;
723         default:
724                 printk(KERN_ERR "%s: word lengh not supported\n",
725                         __func__);
726         }
727
728         if (termios->c_cflag & CSTOPB)
729                 lcr |= STB;
730         if (termios->c_cflag & PARENB)
731                 lcr |= PEN;
732         if (!(termios->c_cflag & PARODD))
733                 lcr |= EPS;
734         if (termios->c_cflag & CMSPAR)
735                 lcr |= STP;
736
737         port->read_status_mask = OE;
738         if (termios->c_iflag & INPCK)
739                 port->read_status_mask |= (FE | PE);
740         if (termios->c_iflag & (BRKINT | PARMRK))
741                 port->read_status_mask |= BI;
742
743         /*
744          * Characters to ignore
745          */
746         port->ignore_status_mask = 0;
747         if (termios->c_iflag & IGNPAR)
748                 port->ignore_status_mask |= FE | PE;
749         if (termios->c_iflag & IGNBRK) {
750                 port->ignore_status_mask |= BI;
751                 /*
752                  * If we're ignoring parity and break indicators,
753                  * ignore overruns too (for real raw support).
754                  */
755                 if (termios->c_iflag & IGNPAR)
756                         port->ignore_status_mask |= OE;
757         }
758
759         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
760         quot = uart_get_divisor(port, baud);
761         spin_lock_irqsave(&uart->port.lock, flags);
762
763         UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
764
765         /* Disable UART */
766         ier = UART_GET_IER(uart);
767         UART_DISABLE_INTS(uart);
768
769         /* Set DLAB in LCR to Access DLL and DLH */
770         UART_SET_DLAB(uart);
771
772         UART_PUT_DLL(uart, quot & 0xFF);
773         UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
774         SSYNC();
775
776         /* Clear DLAB in LCR to Access THR RBR IER */
777         UART_CLEAR_DLAB(uart);
778
779         UART_PUT_LCR(uart, lcr);
780
781         /* Enable UART */
782         UART_ENABLE_INTS(uart, ier);
783
784         val = UART_GET_GCTL(uart);
785         val |= UCEN;
786         UART_PUT_GCTL(uart, val);
787
788         /* Port speed changed, update the per-port timeout. */
789         uart_update_timeout(port, termios->c_cflag, baud);
790
791         spin_unlock_irqrestore(&uart->port.lock, flags);
792 }
793
794 static const char *bfin_serial_type(struct uart_port *port)
795 {
796         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
797
798         return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
799 }
800
801 /*
802  * Release the memory region(s) being used by 'port'.
803  */
804 static void bfin_serial_release_port(struct uart_port *port)
805 {
806 }
807
808 /*
809  * Request the memory region(s) being used by 'port'.
810  */
811 static int bfin_serial_request_port(struct uart_port *port)
812 {
813         return 0;
814 }
815
816 /*
817  * Configure/autoconfigure the port.
818  */
819 static void bfin_serial_config_port(struct uart_port *port, int flags)
820 {
821         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
822
823         if (flags & UART_CONFIG_TYPE &&
824             bfin_serial_request_port(&uart->port) == 0)
825                 uart->port.type = PORT_BFIN;
826 }
827
828 /*
829  * Verify the new serial_struct (for TIOCSSERIAL).
830  * The only change we allow are to the flags and type, and
831  * even then only between PORT_BFIN and PORT_UNKNOWN
832  */
833 static int
834 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
835 {
836         return 0;
837 }
838
839 /*
840  * Enable the IrDA function if tty->ldisc.num is N_IRDA.
841  * In other cases, disable IrDA function.
842  */
843 static void bfin_serial_set_ldisc(struct uart_port *port)
844 {
845         int line = port->line;
846         unsigned short val;
847
848         if (line >= port->info->port.tty->driver->num)
849                 return;
850
851         switch (port->info->port.tty->termios->c_line) {
852         case N_IRDA:
853                 val = UART_GET_GCTL(&bfin_serial_ports[line]);
854                 val |= (IREN | RPOLC);
855                 UART_PUT_GCTL(&bfin_serial_ports[line], val);
856                 break;
857         default:
858                 val = UART_GET_GCTL(&bfin_serial_ports[line]);
859                 val &= ~(IREN | RPOLC);
860                 UART_PUT_GCTL(&bfin_serial_ports[line], val);
861         }
862 }
863
864 #ifdef CONFIG_CONSOLE_POLL
865 static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr)
866 {
867         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
868
869         while (!(UART_GET_LSR(uart) & THRE))
870                 cpu_relax();
871
872         UART_CLEAR_DLAB(uart);
873         UART_PUT_CHAR(uart, (unsigned char)chr);
874 }
875
876 static int bfin_serial_poll_get_char(struct uart_port *port)
877 {
878         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
879         unsigned char chr;
880
881         while (!(UART_GET_LSR(uart) & DR))
882                 cpu_relax();
883
884         UART_CLEAR_DLAB(uart);
885         chr = UART_GET_CHAR(uart);
886
887         return chr;
888 }
889 #endif
890
891 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
892         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
893 static void bfin_kgdboc_port_shutdown(struct uart_port *port)
894 {
895         if (kgdboc_break_enabled) {
896                 kgdboc_break_enabled = 0;
897                 bfin_serial_shutdown(port);
898         }
899 }
900
901 static int bfin_kgdboc_port_startup(struct uart_port *port)
902 {
903         kgdboc_port_line = port->line;
904         kgdboc_break_enabled = !bfin_serial_startup(port);
905         return 0;
906 }
907 #endif
908
909 static void bfin_serial_reset_irda(struct uart_port *port)
910 {
911         int line = port->line;
912         unsigned short val;
913
914         val = UART_GET_GCTL(&bfin_serial_ports[line]);
915         val &= ~(IREN | RPOLC);
916         UART_PUT_GCTL(&bfin_serial_ports[line], val);
917         SSYNC();
918         val |= (IREN | RPOLC);
919         UART_PUT_GCTL(&bfin_serial_ports[line], val);
920         SSYNC();
921 }
922
923 static struct uart_ops bfin_serial_pops = {
924         .tx_empty       = bfin_serial_tx_empty,
925         .set_mctrl      = bfin_serial_set_mctrl,
926         .get_mctrl      = bfin_serial_get_mctrl,
927         .stop_tx        = bfin_serial_stop_tx,
928         .start_tx       = bfin_serial_start_tx,
929         .stop_rx        = bfin_serial_stop_rx,
930         .enable_ms      = bfin_serial_enable_ms,
931         .break_ctl      = bfin_serial_break_ctl,
932         .startup        = bfin_serial_startup,
933         .shutdown       = bfin_serial_shutdown,
934         .set_termios    = bfin_serial_set_termios,
935         .set_ldisc      = bfin_serial_set_ldisc,
936         .type           = bfin_serial_type,
937         .release_port   = bfin_serial_release_port,
938         .request_port   = bfin_serial_request_port,
939         .config_port    = bfin_serial_config_port,
940         .verify_port    = bfin_serial_verify_port,
941 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
942         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
943         .kgdboc_port_startup    = bfin_kgdboc_port_startup,
944         .kgdboc_port_shutdown   = bfin_kgdboc_port_shutdown,
945 #endif
946 #ifdef CONFIG_CONSOLE_POLL
947         .poll_put_char  = bfin_serial_poll_put_char,
948         .poll_get_char  = bfin_serial_poll_get_char,
949 #endif
950 };
951
952 static void __init bfin_serial_init_ports(void)
953 {
954         static int first = 1;
955         int i;
956
957         if (!first)
958                 return;
959         first = 0;
960
961         for (i = 0; i < nr_active_ports; i++) {
962                 bfin_serial_ports[i].port.uartclk   = get_sclk();
963                 bfin_serial_ports[i].port.fifosize  = BFIN_UART_TX_FIFO_SIZE;
964                 bfin_serial_ports[i].port.ops       = &bfin_serial_pops;
965                 bfin_serial_ports[i].port.line      = i;
966                 bfin_serial_ports[i].port.iotype    = UPIO_MEM;
967                 bfin_serial_ports[i].port.membase   =
968                         (void __iomem *)bfin_serial_resource[i].uart_base_addr;
969                 bfin_serial_ports[i].port.mapbase   =
970                         bfin_serial_resource[i].uart_base_addr;
971                 bfin_serial_ports[i].port.irq       =
972                         bfin_serial_resource[i].uart_irq;
973                 bfin_serial_ports[i].port.flags     = UPF_BOOT_AUTOCONF;
974 #ifdef CONFIG_SERIAL_BFIN_DMA
975                 bfin_serial_ports[i].tx_done        = 1;
976                 bfin_serial_ports[i].tx_count       = 0;
977                 bfin_serial_ports[i].tx_dma_channel =
978                         bfin_serial_resource[i].uart_tx_dma_channel;
979                 bfin_serial_ports[i].rx_dma_channel =
980                         bfin_serial_resource[i].uart_rx_dma_channel;
981                 init_timer(&(bfin_serial_ports[i].rx_dma_timer));
982 #endif
983 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
984                 init_timer(&(bfin_serial_ports[i].cts_timer));
985                 bfin_serial_ports[i].cts_pin        =
986                         bfin_serial_resource[i].uart_cts_pin;
987                 bfin_serial_ports[i].rts_pin        =
988                         bfin_serial_resource[i].uart_rts_pin;
989 #endif
990                 bfin_serial_hw_init(&bfin_serial_ports[i]);
991         }
992
993 }
994
995 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
996 /*
997  * If the port was already initialised (eg, by a boot loader),
998  * try to determine the current setup.
999  */
1000 static void __init
1001 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
1002                            int *parity, int *bits)
1003 {
1004         unsigned short status;
1005
1006         status = UART_GET_IER(uart) & (ERBFI | ETBEI);
1007         if (status == (ERBFI | ETBEI)) {
1008                 /* ok, the port was enabled */
1009                 u16 lcr, dlh, dll;
1010
1011                 lcr = UART_GET_LCR(uart);
1012
1013                 *parity = 'n';
1014                 if (lcr & PEN) {
1015                         if (lcr & EPS)
1016                                 *parity = 'e';
1017                         else
1018                                 *parity = 'o';
1019                 }
1020                 switch (lcr & 0x03) {
1021                         case 0: *bits = 5; break;
1022                         case 1: *bits = 6; break;
1023                         case 2: *bits = 7; break;
1024                         case 3: *bits = 8; break;
1025                 }
1026                 /* Set DLAB in LCR to Access DLL and DLH */
1027                 UART_SET_DLAB(uart);
1028
1029                 dll = UART_GET_DLL(uart);
1030                 dlh = UART_GET_DLH(uart);
1031
1032                 /* Clear DLAB in LCR to Access THR RBR IER */
1033                 UART_CLEAR_DLAB(uart);
1034
1035                 *baud = get_sclk() / (16*(dll | dlh << 8));
1036         }
1037         pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits);
1038 }
1039
1040 static struct uart_driver bfin_serial_reg;
1041
1042 static int __init
1043 bfin_serial_console_setup(struct console *co, char *options)
1044 {
1045         struct bfin_serial_port *uart;
1046         int baud = 57600;
1047         int bits = 8;
1048         int parity = 'n';
1049 # ifdef CONFIG_SERIAL_BFIN_CTSRTS
1050         int flow = 'r';
1051 # else
1052         int flow = 'n';
1053 # endif
1054
1055         /*
1056          * Check whether an invalid uart number has been specified, and
1057          * if so, search for the first available port that does have
1058          * console support.
1059          */
1060         if (co->index == -1 || co->index >= nr_active_ports)
1061                 co->index = 0;
1062         uart = &bfin_serial_ports[co->index];
1063
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 }
1071 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1072                                  defined (CONFIG_EARLY_PRINTK) */
1073
1074 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1075 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1076 {
1077         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1078         while (!(UART_GET_LSR(uart) & THRE))
1079                 barrier();
1080         UART_PUT_CHAR(uart, ch);
1081         SSYNC();
1082 }
1083
1084 /*
1085  * Interrupts are disabled on entering
1086  */
1087 static void
1088 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1089 {
1090         struct bfin_serial_port *uart = &bfin_serial_ports[co->index];
1091         int flags = 0;
1092
1093         spin_lock_irqsave(&uart->port.lock, flags);
1094         uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1095         spin_unlock_irqrestore(&uart->port.lock, flags);
1096
1097 }
1098
1099 static struct console bfin_serial_console = {
1100         .name           = BFIN_SERIAL_NAME,
1101         .write          = bfin_serial_console_write,
1102         .device         = uart_console_device,
1103         .setup          = bfin_serial_console_setup,
1104         .flags          = CON_PRINTBUFFER,
1105         .index          = -1,
1106         .data           = &bfin_serial_reg,
1107 };
1108
1109 static int __init bfin_serial_rs_console_init(void)
1110 {
1111         bfin_serial_init_ports();
1112         register_console(&bfin_serial_console);
1113
1114         return 0;
1115 }
1116 console_initcall(bfin_serial_rs_console_init);
1117
1118 #define BFIN_SERIAL_CONSOLE     &bfin_serial_console
1119 #else
1120 #define BFIN_SERIAL_CONSOLE     NULL
1121 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1122
1123
1124 #ifdef CONFIG_EARLY_PRINTK
1125 static __init void early_serial_putc(struct uart_port *port, int ch)
1126 {
1127         unsigned timeout = 0xffff;
1128         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1129
1130         while ((!(UART_GET_LSR(uart) & THRE)) && --timeout)
1131                 cpu_relax();
1132         UART_PUT_CHAR(uart, ch);
1133 }
1134
1135 static __init void early_serial_write(struct console *con, const char *s,
1136                                         unsigned int n)
1137 {
1138         struct bfin_serial_port *uart = &bfin_serial_ports[con->index];
1139         unsigned int i;
1140
1141         for (i = 0; i < n; i++, s++) {
1142                 if (*s == '\n')
1143                         early_serial_putc(&uart->port, '\r');
1144                 early_serial_putc(&uart->port, *s);
1145         }
1146 }
1147
1148 static struct __initdata console bfin_early_serial_console = {
1149         .name = "early_BFuart",
1150         .write = early_serial_write,
1151         .device = uart_console_device,
1152         .flags = CON_PRINTBUFFER,
1153         .setup = bfin_serial_console_setup,
1154         .index = -1,
1155         .data  = &bfin_serial_reg,
1156 };
1157
1158 struct console __init *bfin_earlyserial_init(unsigned int port,
1159                                                 unsigned int cflag)
1160 {
1161         struct bfin_serial_port *uart;
1162         struct ktermios t;
1163
1164         if (port == -1 || port >= nr_active_ports)
1165                 port = 0;
1166         bfin_serial_init_ports();
1167         bfin_early_serial_console.index = port;
1168         uart = &bfin_serial_ports[port];
1169         t.c_cflag = cflag;
1170         t.c_iflag = 0;
1171         t.c_oflag = 0;
1172         t.c_lflag = ICANON;
1173         t.c_line = port;
1174         bfin_serial_set_termios(&uart->port, &t, &t);
1175         return &bfin_early_serial_console;
1176 }
1177
1178 #endif /* CONFIG_EARLY_PRINTK */
1179
1180 static struct uart_driver bfin_serial_reg = {
1181         .owner                  = THIS_MODULE,
1182         .driver_name            = "bfin-uart",
1183         .dev_name               = BFIN_SERIAL_NAME,
1184         .major                  = BFIN_SERIAL_MAJOR,
1185         .minor                  = BFIN_SERIAL_MINOR,
1186         .nr                     = BFIN_UART_NR_PORTS,
1187         .cons                   = BFIN_SERIAL_CONSOLE,
1188 };
1189
1190 static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state)
1191 {
1192         int i;
1193
1194         for (i = 0; i < nr_active_ports; i++) {
1195                 if (bfin_serial_ports[i].port.dev != &dev->dev)
1196                         continue;
1197                 uart_suspend_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1198         }
1199
1200         return 0;
1201 }
1202
1203 static int bfin_serial_resume(struct platform_device *dev)
1204 {
1205         int i;
1206
1207         for (i = 0; i < nr_active_ports; i++) {
1208                 if (bfin_serial_ports[i].port.dev != &dev->dev)
1209                         continue;
1210                 uart_resume_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1211         }
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_active_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                 }
1232         }
1233
1234         return 0;
1235 }
1236
1237 static int bfin_serial_remove(struct platform_device *dev)
1238 {
1239         int i;
1240
1241         for (i = 0; i < nr_active_ports; i++) {
1242                 if (bfin_serial_ports[i].port.dev != &dev->dev)
1243                         continue;
1244                 uart_remove_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1245                 bfin_serial_ports[i].port.dev = NULL;
1246 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
1247                 gpio_free(bfin_serial_ports[i].cts_pin);
1248                 gpio_free(bfin_serial_ports[i].rts_pin);
1249 #endif
1250         }
1251
1252         return 0;
1253 }
1254
1255 static struct platform_driver bfin_serial_driver = {
1256         .probe          = bfin_serial_probe,
1257         .remove         = bfin_serial_remove,
1258         .suspend        = bfin_serial_suspend,
1259         .resume         = bfin_serial_resume,
1260         .driver         = {
1261                 .name   = "bfin-uart",
1262                 .owner  = THIS_MODULE,
1263         },
1264 };
1265
1266 static int __init bfin_serial_init(void)
1267 {
1268         int ret;
1269
1270         pr_info("Serial: Blackfin serial driver\n");
1271
1272         bfin_serial_init_ports();
1273
1274         ret = uart_register_driver(&bfin_serial_reg);
1275         if (ret == 0) {
1276                 ret = platform_driver_register(&bfin_serial_driver);
1277                 if (ret) {
1278                         pr_debug("uart register failed\n");
1279                         uart_unregister_driver(&bfin_serial_reg);
1280                 }
1281         }
1282         return ret;
1283 }
1284
1285 static void __exit bfin_serial_exit(void)
1286 {
1287         platform_driver_unregister(&bfin_serial_driver);
1288         uart_unregister_driver(&bfin_serial_reg);
1289 }
1290
1291
1292 module_init(bfin_serial_init);
1293 module_exit(bfin_serial_exit);
1294
1295 MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>");
1296 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1297 MODULE_LICENSE("GPL");
1298 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);
1299 MODULE_ALIAS("platform:bfin-uart");