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Linux/drivers/tty/serial/bfin_uart.c

  1 /*
  2  * Blackfin On-Chip Serial Driver
  3  *
  4  * Copyright 2006-2011 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 #define DRIVER_NAME "bfin-uart"
 16 #define pr_fmt(fmt) DRIVER_NAME ": " fmt
 17 
 18 #include <linux/module.h>
 19 #include <linux/ioport.h>
 20 #include <linux/gfp.h>
 21 #include <linux/io.h>
 22 #include <linux/init.h>
 23 #include <linux/console.h>
 24 #include <linux/sysrq.h>
 25 #include <linux/platform_device.h>
 26 #include <linux/tty.h>
 27 #include <linux/tty_flip.h>
 28 #include <linux/serial_core.h>
 29 #include <linux/gpio.h>
 30 #include <linux/irq.h>
 31 #include <linux/kgdb.h>
 32 #include <linux/slab.h>
 33 #include <linux/dma-mapping.h>
 34 
 35 #include <asm/portmux.h>
 36 #include <asm/cacheflush.h>
 37 #include <asm/dma.h>
 38 #include <asm/bfin_serial.h>
 39 
 40 #ifdef CONFIG_SERIAL_BFIN_MODULE
 41 # undef CONFIG_EARLY_PRINTK
 42 #endif
 43 
 44 /* UART name and device definitions */
 45 #define BFIN_SERIAL_DEV_NAME    "ttyBF"
 46 #define BFIN_SERIAL_MAJOR       204
 47 #define BFIN_SERIAL_MINOR       64
 48 
 49 static struct bfin_serial_port *bfin_serial_ports[BFIN_UART_NR_PORTS];
 50 
 51 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 52         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 53 
 54 # ifndef CONFIG_SERIAL_BFIN_PIO
 55 #  error KGDB only support UART in PIO mode.
 56 # endif
 57 
 58 static int kgdboc_port_line;
 59 static int kgdboc_break_enabled;
 60 #endif
 61 /*
 62  * Setup for console. Argument comes from the menuconfig
 63  */
 64 #define DMA_RX_XCOUNT           512
 65 #define DMA_RX_YCOUNT           (PAGE_SIZE / DMA_RX_XCOUNT)
 66 
 67 #define DMA_RX_FLUSH_JIFFIES    (HZ / 50)
 68 
 69 #ifdef CONFIG_SERIAL_BFIN_DMA
 70 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart);
 71 #else
 72 static void bfin_serial_tx_chars(struct bfin_serial_port *uart);
 73 #endif
 74 
 75 static void bfin_serial_reset_irda(struct uart_port *port);
 76 
 77 #if defined(SERIAL_BFIN_CTSRTS) || \
 78         defined(SERIAL_BFIN_HARD_CTSRTS)
 79 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
 80 {
 81         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 82         if (uart->cts_pin < 0)
 83                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 84 
 85         /* CTS PIN is negative assertive. */
 86         if (UART_GET_CTS(uart))
 87                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 88         else
 89                 return TIOCM_DSR | TIOCM_CAR;
 90 }
 91 
 92 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
 93 {
 94         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 95         if (uart->rts_pin < 0)
 96                 return;
 97 
 98         /* RTS PIN is negative assertive. */
 99         if (mctrl & TIOCM_RTS)
100                 UART_ENABLE_RTS(uart);
101         else
102                 UART_DISABLE_RTS(uart);
103 }
104 
105 /*
106  * Handle any change of modem status signal.
107  */
108 static irqreturn_t bfin_serial_mctrl_cts_int(int irq, void *dev_id)
109 {
110         struct bfin_serial_port *uart = dev_id;
111         struct uart_port *uport = &uart->port;
112         unsigned int status = bfin_serial_get_mctrl(uport);
113 #ifdef SERIAL_BFIN_HARD_CTSRTS
114 
115         UART_CLEAR_SCTS(uart);
116         if (uport->hw_stopped) {
117                 if (status) {
118                         uport->hw_stopped = 0;
119                         uart_write_wakeup(uport);
120                 }
121         } else {
122                 if (!status)
123                         uport->hw_stopped = 1;
124         }
125 #else
126         uart_handle_cts_change(uport, status & TIOCM_CTS);
127 #endif
128 
129         return IRQ_HANDLED;
130 }
131 #else
132 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
133 {
134         return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
135 }
136 
137 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
138 {
139 }
140 #endif
141 
142 /*
143  * interrupts are disabled on entry
144  */
145 static void bfin_serial_stop_tx(struct uart_port *port)
146 {
147         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
148 #ifdef CONFIG_SERIAL_BFIN_DMA
149         struct circ_buf *xmit = &uart->port.state->xmit;
150 #endif
151 
152         while (!(UART_GET_LSR(uart) & TEMT))
153                 cpu_relax();
154 
155 #ifdef CONFIG_SERIAL_BFIN_DMA
156         disable_dma(uart->tx_dma_channel);
157         xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
158         uart->port.icount.tx += uart->tx_count;
159         uart->tx_count = 0;
160         uart->tx_done = 1;
161 #else
162 #if defined(CONFIG_BF54x) || defined(CONFIG_BF60x)
163         /* Clear TFI bit */
164         UART_PUT_LSR(uart, TFI);
165 #endif
166         UART_CLEAR_IER(uart, ETBEI);
167 #endif
168 }
169 
170 /*
171  * port is locked and interrupts are disabled
172  */
173 static void bfin_serial_start_tx(struct uart_port *port)
174 {
175         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
176         struct tty_struct *tty = uart->port.state->port.tty;
177 
178         /*
179          * To avoid losting RX interrupt, we reset IR function
180          * before sending data.
181          */
182         if (tty->termios.c_line == N_IRDA)
183                 bfin_serial_reset_irda(port);
184 
185 #ifdef CONFIG_SERIAL_BFIN_DMA
186         if (uart->tx_done)
187                 bfin_serial_dma_tx_chars(uart);
188 #else
189         UART_SET_IER(uart, ETBEI);
190         bfin_serial_tx_chars(uart);
191 #endif
192 }
193 
194 /*
195  * Interrupts are enabled
196  */
197 static void bfin_serial_stop_rx(struct uart_port *port)
198 {
199         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
200 
201         UART_CLEAR_IER(uart, ERBFI);
202 }
203 
204 #if ANOMALY_05000363 && defined(CONFIG_SERIAL_BFIN_PIO)
205 # define UART_GET_ANOMALY_THRESHOLD(uart)    ((uart)->anomaly_threshold)
206 # define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v))
207 #else
208 # define UART_GET_ANOMALY_THRESHOLD(uart)    0
209 # define UART_SET_ANOMALY_THRESHOLD(uart, v)
210 #endif
211 
212 #ifdef CONFIG_SERIAL_BFIN_PIO
213 static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
214 {
215         unsigned int status, ch, flg;
216         static u64 anomaly_start;
217 
218         status = UART_GET_LSR(uart);
219         UART_CLEAR_LSR(uart);
220 
221         ch = UART_GET_CHAR(uart);
222         uart->port.icount.rx++;
223 
224 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
225         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
226         if (kgdb_connected && kgdboc_port_line == uart->port.line
227                 && kgdboc_break_enabled)
228                 if (ch == 0x3) {/* Ctrl + C */
229                         kgdb_breakpoint();
230                         return;
231                 }
232 
233         if (!uart->port.state)
234                 return;
235 #endif
236         if (ANOMALY_05000363) {
237                 /* The BF533 (and BF561) family of processors have a nice anomaly
238                  * where they continuously generate characters for a "single" break.
239                  * We have to basically ignore this flood until the "next" valid
240                  * character comes across.  Due to the nature of the flood, it is
241                  * not possible to reliably catch bytes that are sent too quickly
242                  * after this break.  So application code talking to the Blackfin
243                  * which sends a break signal must allow at least 1.5 character
244                  * times after the end of the break for things to stabilize.  This
245                  * timeout was picked as it must absolutely be larger than 1
246                  * character time +/- some percent.  So 1.5 sounds good.  All other
247                  * Blackfin families operate properly.  Woo.
248                  */
249                 if (anomaly_start > 0) {
250                         u64 curr, nsecs, threshold_ns;
251 
252                         if ((~ch & (~ch + 1)) & 0xff)
253                                 goto known_good_char;
254 
255                         curr = ktime_get_ns();
256                         nsecs = curr - anomaly_start;
257                         if (nsecs >> 32)
258                                 goto known_good_char;
259 
260                         threshold_ns = UART_GET_ANOMALY_THRESHOLD(uart)
261                                                         * NSEC_PER_USEC;
262                         if (nsecs > threshold_ns)
263                                 goto known_good_char;
264 
265                         if (ch)
266                                 anomaly_start = 0;
267                         else
268                                 anomaly_start = curr;
269 
270                         return;
271 
272  known_good_char:
273                         status &= ~BI;
274                         anomaly_start = 0;
275                 }
276         }
277 
278         if (status & BI) {
279                 if (ANOMALY_05000363)
280                         if (bfin_revid() < 5)
281                                 anomaly_start = ktime_get_ns();
282                 uart->port.icount.brk++;
283                 if (uart_handle_break(&uart->port))
284                         goto ignore_char;
285                 status &= ~(PE | FE);
286         }
287         if (status & PE)
288                 uart->port.icount.parity++;
289         if (status & OE)
290                 uart->port.icount.overrun++;
291         if (status & FE)
292                 uart->port.icount.frame++;
293 
294         status &= uart->port.read_status_mask;
295 
296         if (status & BI)
297                 flg = TTY_BREAK;
298         else if (status & PE)
299                 flg = TTY_PARITY;
300         else if (status & FE)
301                 flg = TTY_FRAME;
302         else
303                 flg = TTY_NORMAL;
304 
305         if (uart_handle_sysrq_char(&uart->port, ch))
306                 goto ignore_char;
307 
308         uart_insert_char(&uart->port, status, OE, ch, flg);
309 
310  ignore_char:
311         tty_flip_buffer_push(&uart->port.state->port);
312 }
313 
314 static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
315 {
316         struct circ_buf *xmit = &uart->port.state->xmit;
317 
318         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
319 #if defined(CONFIG_BF54x) || defined(CONFIG_BF60x)
320                 /* Clear TFI bit */
321                 UART_PUT_LSR(uart, TFI);
322 #endif
323                 /* Anomaly notes:
324                  *  05000215 -  we always clear ETBEI within last UART TX
325                  *              interrupt to end a string. It is always set
326                  *              when start a new tx.
327                  */
328                 UART_CLEAR_IER(uart, ETBEI);
329                 return;
330         }
331 
332         if (uart->port.x_char) {
333                 UART_PUT_CHAR(uart, uart->port.x_char);
334                 uart->port.icount.tx++;
335                 uart->port.x_char = 0;
336         }
337 
338         while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
339                 UART_PUT_CHAR(uart, xmit->buf[xmit->tail]);
340                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
341                 uart->port.icount.tx++;
342         }
343 
344         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
345                 uart_write_wakeup(&uart->port);
346 }
347 
348 static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
349 {
350         struct bfin_serial_port *uart = dev_id;
351 
352         while (UART_GET_LSR(uart) & DR)
353                 bfin_serial_rx_chars(uart);
354 
355         return IRQ_HANDLED;
356 }
357 
358 static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
359 {
360         struct bfin_serial_port *uart = dev_id;
361 
362         spin_lock(&uart->port.lock);
363         if (UART_GET_LSR(uart) & THRE)
364                 bfin_serial_tx_chars(uart);
365         spin_unlock(&uart->port.lock);
366 
367         return IRQ_HANDLED;
368 }
369 #endif
370 
371 #ifdef CONFIG_SERIAL_BFIN_DMA
372 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
373 {
374         struct circ_buf *xmit = &uart->port.state->xmit;
375 
376         uart->tx_done = 0;
377 
378         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
379                 uart->tx_count = 0;
380                 uart->tx_done = 1;
381                 return;
382         }
383 
384         if (uart->port.x_char) {
385                 UART_PUT_CHAR(uart, uart->port.x_char);
386                 uart->port.icount.tx++;
387                 uart->port.x_char = 0;
388         }
389 
390         uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
391         if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
392                 uart->tx_count = UART_XMIT_SIZE - xmit->tail;
393         blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
394                                         (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
395         set_dma_config(uart->tx_dma_channel,
396                 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
397                         INTR_ON_BUF,
398                         DIMENSION_LINEAR,
399                         DATA_SIZE_8,
400                         DMA_SYNC_RESTART));
401         set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
402         set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
403         set_dma_x_modify(uart->tx_dma_channel, 1);
404         SSYNC();
405         enable_dma(uart->tx_dma_channel);
406 
407         UART_SET_IER(uart, ETBEI);
408 }
409 
410 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
411 {
412         int i, flg, status;
413 
414         status = UART_GET_LSR(uart);
415         UART_CLEAR_LSR(uart);
416 
417         uart->port.icount.rx +=
418                 CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail,
419                 UART_XMIT_SIZE);
420 
421         if (status & BI) {
422                 uart->port.icount.brk++;
423                 if (uart_handle_break(&uart->port))
424                         goto dma_ignore_char;
425                 status &= ~(PE | FE);
426         }
427         if (status & PE)
428                 uart->port.icount.parity++;
429         if (status & OE)
430                 uart->port.icount.overrun++;
431         if (status & FE)
432                 uart->port.icount.frame++;
433 
434         status &= uart->port.read_status_mask;
435 
436         if (status & BI)
437                 flg = TTY_BREAK;
438         else if (status & PE)
439                 flg = TTY_PARITY;
440         else if (status & FE)
441                 flg = TTY_FRAME;
442         else
443                 flg = TTY_NORMAL;
444 
445         for (i = uart->rx_dma_buf.tail; ; i++) {
446                 if (i >= UART_XMIT_SIZE)
447                         i = 0;
448                 if (i == uart->rx_dma_buf.head)
449                         break;
450                 if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
451                         uart_insert_char(&uart->port, status, OE,
452                                 uart->rx_dma_buf.buf[i], flg);
453         }
454 
455  dma_ignore_char:
456         tty_flip_buffer_push(&uart->port.state->port);
457 }
458 
459 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
460 {
461         int x_pos, pos;
462         unsigned long flags;
463 
464         dma_disable_irq_nosync(uart->rx_dma_channel);
465         spin_lock_irqsave(&uart->rx_lock, flags);
466 
467         /* 2D DMA RX buffer ring is used. Because curr_y_count and
468          * curr_x_count can't be read as an atomic operation,
469          * curr_y_count should be read before curr_x_count. When
470          * curr_x_count is read, curr_y_count may already indicate
471          * next buffer line. But, the position calculated here is
472          * still indicate the old line. The wrong position data may
473          * be smaller than current buffer tail, which cause garbages
474          * are received if it is not prohibit.
475          */
476         uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
477         x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
478         uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
479         if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
480                 uart->rx_dma_nrows = 0;
481         x_pos = DMA_RX_XCOUNT - x_pos;
482         if (x_pos == DMA_RX_XCOUNT)
483                 x_pos = 0;
484 
485         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
486         /* Ignore receiving data if new position is in the same line of
487          * current buffer tail and small.
488          */
489         if (pos > uart->rx_dma_buf.tail ||
490                 uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
491                 uart->rx_dma_buf.head = pos;
492                 bfin_serial_dma_rx_chars(uart);
493                 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
494         }
495 
496         spin_unlock_irqrestore(&uart->rx_lock, flags);
497         dma_enable_irq(uart->rx_dma_channel);
498 
499         mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES);
500 }
501 
502 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
503 {
504         struct bfin_serial_port *uart = dev_id;
505         struct circ_buf *xmit = &uart->port.state->xmit;
506 
507         spin_lock(&uart->port.lock);
508         if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
509                 disable_dma(uart->tx_dma_channel);
510                 clear_dma_irqstat(uart->tx_dma_channel);
511                 /* Anomaly notes:
512                  *  05000215 -  we always clear ETBEI within last UART TX
513                  *              interrupt to end a string. It is always set
514                  *              when start a new tx.
515                  */
516                 UART_CLEAR_IER(uart, ETBEI);
517                 uart->port.icount.tx += uart->tx_count;
518                 if (!(xmit->tail == 0 && xmit->head == 0)) {
519                         xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
520 
521                         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
522                                 uart_write_wakeup(&uart->port);
523                 }
524 
525                 bfin_serial_dma_tx_chars(uart);
526         }
527 
528         spin_unlock(&uart->port.lock);
529         return IRQ_HANDLED;
530 }
531 
532 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
533 {
534         struct bfin_serial_port *uart = dev_id;
535         unsigned int irqstat;
536         int x_pos, pos;
537 
538         spin_lock(&uart->rx_lock);
539         irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
540         clear_dma_irqstat(uart->rx_dma_channel);
541 
542         uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
543         x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
544         uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
545         if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
546                 uart->rx_dma_nrows = 0;
547 
548         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT;
549         if (pos > uart->rx_dma_buf.tail ||
550                 uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
551                 uart->rx_dma_buf.head = pos;
552                 bfin_serial_dma_rx_chars(uart);
553                 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
554         }
555 
556         spin_unlock(&uart->rx_lock);
557 
558         return IRQ_HANDLED;
559 }
560 #endif
561 
562 /*
563  * Return TIOCSER_TEMT when transmitter is not busy.
564  */
565 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
566 {
567         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
568         unsigned int lsr;
569 
570         lsr = UART_GET_LSR(uart);
571         if (lsr & TEMT)
572                 return TIOCSER_TEMT;
573         else
574                 return 0;
575 }
576 
577 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
578 {
579         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
580         u32 lcr = UART_GET_LCR(uart);
581         if (break_state)
582                 lcr |= SB;
583         else
584                 lcr &= ~SB;
585         UART_PUT_LCR(uart, lcr);
586         SSYNC();
587 }
588 
589 static int bfin_serial_startup(struct uart_port *port)
590 {
591         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
592 
593 #ifdef CONFIG_SERIAL_BFIN_DMA
594         dma_addr_t dma_handle;
595 
596         if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
597                 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
598                 return -EBUSY;
599         }
600 
601         if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
602                 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
603                 free_dma(uart->rx_dma_channel);
604                 return -EBUSY;
605         }
606 
607         set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
608         set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
609 
610         uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
611         uart->rx_dma_buf.head = 0;
612         uart->rx_dma_buf.tail = 0;
613         uart->rx_dma_nrows = 0;
614 
615         set_dma_config(uart->rx_dma_channel,
616                 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
617                                 INTR_ON_ROW, DIMENSION_2D,
618                                 DATA_SIZE_8,
619                                 DMA_SYNC_RESTART));
620         set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
621         set_dma_x_modify(uart->rx_dma_channel, 1);
622         set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
623         set_dma_y_modify(uart->rx_dma_channel, 1);
624         set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
625         enable_dma(uart->rx_dma_channel);
626 
627         uart->rx_dma_timer.data = (unsigned long)(uart);
628         uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
629         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
630         add_timer(&(uart->rx_dma_timer));
631 #else
632 # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
633         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
634         if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled)
635                 kgdboc_break_enabled = 0;
636         else {
637 # endif
638         if (request_irq(uart->rx_irq, bfin_serial_rx_int, 0,
639              "BFIN_UART_RX", uart)) {
640                 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
641                 return -EBUSY;
642         }
643 
644         if (request_irq
645             (uart->tx_irq, bfin_serial_tx_int, 0,
646              "BFIN_UART_TX", uart)) {
647                 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
648                 free_irq(uart->rx_irq, uart);
649                 return -EBUSY;
650         }
651 
652 # ifdef CONFIG_BF54x
653         {
654                 /*
655                  * UART2 and UART3 on BF548 share interrupt PINs and DMA
656                  * controllers with SPORT2 and SPORT3. UART rx and tx
657                  * interrupts are generated in PIO mode only when configure
658                  * their peripheral mapping registers properly, which means
659                  * request corresponding DMA channels in PIO mode as well.
660                  */
661                 unsigned uart_dma_ch_rx, uart_dma_ch_tx;
662 
663                 switch (uart->rx_irq) {
664                 case IRQ_UART3_RX:
665                         uart_dma_ch_rx = CH_UART3_RX;
666                         uart_dma_ch_tx = CH_UART3_TX;
667                         break;
668                 case IRQ_UART2_RX:
669                         uart_dma_ch_rx = CH_UART2_RX;
670                         uart_dma_ch_tx = CH_UART2_TX;
671                         break;
672                 default:
673                         uart_dma_ch_rx = uart_dma_ch_tx = 0;
674                         break;
675                 }
676 
677                 if (uart_dma_ch_rx &&
678                         request_dma(uart_dma_ch_rx, "BFIN_UART_RX") < 0) {
679                         printk(KERN_NOTICE"Fail to attach UART interrupt\n");
680                         free_irq(uart->rx_irq, uart);
681                         free_irq(uart->tx_irq, uart);
682                         return -EBUSY;
683                 }
684                 if (uart_dma_ch_tx &&
685                         request_dma(uart_dma_ch_tx, "BFIN_UART_TX") < 0) {
686                         printk(KERN_NOTICE "Fail to attach UART interrupt\n");
687                         free_dma(uart_dma_ch_rx);
688                         free_irq(uart->rx_irq, uart);
689                         free_irq(uart->tx_irq, uart);
690                         return -EBUSY;
691                 }
692         }
693 # endif
694 # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
695         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
696         }
697 # endif
698 #endif
699 
700 #ifdef SERIAL_BFIN_CTSRTS
701         if (uart->cts_pin >= 0) {
702                 if (request_irq(gpio_to_irq(uart->cts_pin),
703                         bfin_serial_mctrl_cts_int,
704                         IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
705                         0, "BFIN_UART_CTS", uart)) {
706                         uart->cts_pin = -1;
707                         pr_info("Unable to attach BlackFin UART CTS interrupt. So, disable it.\n");
708                 }
709         }
710         if (uart->rts_pin >= 0) {
711                 if (gpio_request(uart->rts_pin, DRIVER_NAME)) {
712                         pr_info("fail to request RTS PIN at GPIO_%d\n", uart->rts_pin);
713                         uart->rts_pin = -1;
714                 } else
715                         gpio_direction_output(uart->rts_pin, 0);
716         }
717 #endif
718 #ifdef SERIAL_BFIN_HARD_CTSRTS
719         if (uart->cts_pin >= 0) {
720                 if (request_irq(uart->status_irq, bfin_serial_mctrl_cts_int,
721                         0, "BFIN_UART_MODEM_STATUS", uart)) {
722                         uart->cts_pin = -1;
723                         dev_info(port->dev, "Unable to attach BlackFin UART Modem Status interrupt.\n");
724                 }
725 
726                 /* CTS RTS PINs are negative assertive. */
727                 UART_PUT_MCR(uart, UART_GET_MCR(uart) | ACTS);
728                 UART_SET_IER(uart, EDSSI);
729         }
730 #endif
731 
732         UART_SET_IER(uart, ERBFI);
733         return 0;
734 }
735 
736 static void bfin_serial_shutdown(struct uart_port *port)
737 {
738         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
739 
740 #ifdef CONFIG_SERIAL_BFIN_DMA
741         disable_dma(uart->tx_dma_channel);
742         free_dma(uart->tx_dma_channel);
743         disable_dma(uart->rx_dma_channel);
744         free_dma(uart->rx_dma_channel);
745         del_timer(&(uart->rx_dma_timer));
746         dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
747 #else
748 #ifdef CONFIG_BF54x
749         switch (uart->port.irq) {
750         case IRQ_UART3_RX:
751                 free_dma(CH_UART3_RX);
752                 free_dma(CH_UART3_TX);
753                 break;
754         case IRQ_UART2_RX:
755                 free_dma(CH_UART2_RX);
756                 free_dma(CH_UART2_TX);
757                 break;
758         default:
759                 break;
760         }
761 #endif
762         free_irq(uart->rx_irq, uart);
763         free_irq(uart->tx_irq, uart);
764 #endif
765 
766 #ifdef SERIAL_BFIN_CTSRTS
767         if (uart->cts_pin >= 0)
768                 free_irq(gpio_to_irq(uart->cts_pin), uart);
769         if (uart->rts_pin >= 0)
770                 gpio_free(uart->rts_pin);
771 #endif
772 #ifdef SERIAL_BFIN_HARD_CTSRTS
773         if (uart->cts_pin >= 0)
774                 free_irq(uart->status_irq, uart);
775 #endif
776 }
777 
778 static void
779 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
780                    struct ktermios *old)
781 {
782         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
783         unsigned long flags;
784         unsigned int baud, quot;
785         unsigned int ier, lcr = 0;
786         unsigned long timeout;
787 
788 #ifdef SERIAL_BFIN_CTSRTS
789         if (old == NULL && uart->cts_pin != -1)
790                 termios->c_cflag |= CRTSCTS;
791         else if (uart->cts_pin == -1)
792                 termios->c_cflag &= ~CRTSCTS;
793 #endif
794 
795         switch (termios->c_cflag & CSIZE) {
796         case CS8:
797                 lcr = WLS(8);
798                 break;
799         case CS7:
800                 lcr = WLS(7);
801                 break;
802         case CS6:
803                 lcr = WLS(6);
804                 break;
805         case CS5:
806                 lcr = WLS(5);
807                 break;
808         default:
809                 printk(KERN_ERR "%s: word length not supported\n",
810                         __func__);
811         }
812 
813         /* Anomaly notes:
814          *  05000231 -  STOP bit is always set to 1 whatever the user is set.
815          */
816         if (termios->c_cflag & CSTOPB) {
817                 if (ANOMALY_05000231)
818                         printk(KERN_WARNING "STOP bits other than 1 is not "
819                                 "supported in case of anomaly 05000231.\n");
820                 else
821                         lcr |= STB;
822         }
823         if (termios->c_cflag & PARENB)
824                 lcr |= PEN;
825         if (!(termios->c_cflag & PARODD))
826                 lcr |= EPS;
827         if (termios->c_cflag & CMSPAR)
828                 lcr |= STP;
829 
830         spin_lock_irqsave(&uart->port.lock, flags);
831 
832         port->read_status_mask = OE;
833         if (termios->c_iflag & INPCK)
834                 port->read_status_mask |= (FE | PE);
835         if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
836                 port->read_status_mask |= BI;
837 
838         /*
839          * Characters to ignore
840          */
841         port->ignore_status_mask = 0;
842         if (termios->c_iflag & IGNPAR)
843                 port->ignore_status_mask |= FE | PE;
844         if (termios->c_iflag & IGNBRK) {
845                 port->ignore_status_mask |= BI;
846                 /*
847                  * If we're ignoring parity and break indicators,
848                  * ignore overruns too (for real raw support).
849                  */
850                 if (termios->c_iflag & IGNPAR)
851                         port->ignore_status_mask |= OE;
852         }
853 
854         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
855         quot = uart_get_divisor(port, baud);
856 
857         /* If discipline is not IRDA, apply ANOMALY_05000230 */
858         if (termios->c_line != N_IRDA)
859                 quot -= ANOMALY_05000230;
860 
861         UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
862 
863         /* Wait till the transfer buffer is empty */
864         timeout = jiffies + msecs_to_jiffies(10);
865         while (UART_GET_GCTL(uart) & UCEN && !(UART_GET_LSR(uart) & TEMT))
866                 if (time_after(jiffies, timeout)) {
867                         dev_warn(port->dev, "timeout waiting for TX buffer empty\n");
868                         break;
869                 }
870 
871         /* Disable UART */
872         ier = UART_GET_IER(uart);
873         UART_PUT_GCTL(uart, UART_GET_GCTL(uart) & ~UCEN);
874         UART_DISABLE_INTS(uart);
875 
876         /* Set DLAB in LCR to Access CLK */
877         UART_SET_DLAB(uart);
878 
879         UART_PUT_CLK(uart, quot);
880         SSYNC();
881 
882         /* Clear DLAB in LCR to Access THR RBR IER */
883         UART_CLEAR_DLAB(uart);
884 
885         UART_PUT_LCR(uart, (UART_GET_LCR(uart) & ~LCR_MASK) | lcr);
886 
887         /* Enable UART */
888         UART_ENABLE_INTS(uart, ier);
889         UART_PUT_GCTL(uart, UART_GET_GCTL(uart) | UCEN);
890 
891         /* Port speed changed, update the per-port timeout. */
892         uart_update_timeout(port, termios->c_cflag, baud);
893 
894         spin_unlock_irqrestore(&uart->port.lock, flags);
895 }
896 
897 static const char *bfin_serial_type(struct uart_port *port)
898 {
899         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
900 
901         return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
902 }
903 
904 /*
905  * Release the memory region(s) being used by 'port'.
906  */
907 static void bfin_serial_release_port(struct uart_port *port)
908 {
909 }
910 
911 /*
912  * Request the memory region(s) being used by 'port'.
913  */
914 static int bfin_serial_request_port(struct uart_port *port)
915 {
916         return 0;
917 }
918 
919 /*
920  * Configure/autoconfigure the port.
921  */
922 static void bfin_serial_config_port(struct uart_port *port, int flags)
923 {
924         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
925 
926         if (flags & UART_CONFIG_TYPE &&
927             bfin_serial_request_port(&uart->port) == 0)
928                 uart->port.type = PORT_BFIN;
929 }
930 
931 /*
932  * Verify the new serial_struct (for TIOCSSERIAL).
933  * The only change we allow are to the flags and type, and
934  * even then only between PORT_BFIN and PORT_UNKNOWN
935  */
936 static int
937 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
938 {
939         return 0;
940 }
941 
942 /*
943  * Enable the IrDA function if tty->ldisc.num is N_IRDA.
944  * In other cases, disable IrDA function.
945  */
946 static void bfin_serial_set_ldisc(struct uart_port *port,
947                                   struct ktermios *termios)
948 {
949         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
950         unsigned int val;
951 
952         switch (termios->c_line) {
953         case N_IRDA:
954                 val = UART_GET_GCTL(uart);
955                 val |= (UMOD_IRDA | RPOLC);
956                 UART_PUT_GCTL(uart, val);
957                 break;
958         default:
959                 val = UART_GET_GCTL(uart);
960                 val &= ~(UMOD_MASK | RPOLC);
961                 UART_PUT_GCTL(uart, val);
962         }
963 }
964 
965 static void bfin_serial_reset_irda(struct uart_port *port)
966 {
967         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
968         unsigned int val;
969 
970         val = UART_GET_GCTL(uart);
971         val &= ~(UMOD_MASK | RPOLC);
972         UART_PUT_GCTL(uart, val);
973         SSYNC();
974         val |= (UMOD_IRDA | RPOLC);
975         UART_PUT_GCTL(uart, val);
976         SSYNC();
977 }
978 
979 #ifdef CONFIG_CONSOLE_POLL
980 /* Anomaly notes:
981  *  05000099 -  Because we only use THRE in poll_put and DR in poll_get,
982  *              losing other bits of UART_LSR is not a problem here.
983  */
984 static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr)
985 {
986         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
987 
988         while (!(UART_GET_LSR(uart) & THRE))
989                 cpu_relax();
990 
991         UART_CLEAR_DLAB(uart);
992         UART_PUT_CHAR(uart, (unsigned char)chr);
993 }
994 
995 static int bfin_serial_poll_get_char(struct uart_port *port)
996 {
997         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
998         unsigned char chr;
999 
1000         while (!(UART_GET_LSR(uart) & DR))
1001                 cpu_relax();
1002 
1003         UART_CLEAR_DLAB(uart);
1004         chr = UART_GET_CHAR(uart);
1005 
1006         return chr;
1007 }
1008 #endif
1009 
1010 static struct uart_ops bfin_serial_pops = {
1011         .tx_empty       = bfin_serial_tx_empty,
1012         .set_mctrl      = bfin_serial_set_mctrl,
1013         .get_mctrl      = bfin_serial_get_mctrl,
1014         .stop_tx        = bfin_serial_stop_tx,
1015         .start_tx       = bfin_serial_start_tx,
1016         .stop_rx        = bfin_serial_stop_rx,
1017         .break_ctl      = bfin_serial_break_ctl,
1018         .startup        = bfin_serial_startup,
1019         .shutdown       = bfin_serial_shutdown,
1020         .set_termios    = bfin_serial_set_termios,
1021         .set_ldisc      = bfin_serial_set_ldisc,
1022         .type           = bfin_serial_type,
1023         .release_port   = bfin_serial_release_port,
1024         .request_port   = bfin_serial_request_port,
1025         .config_port    = bfin_serial_config_port,
1026         .verify_port    = bfin_serial_verify_port,
1027 #ifdef CONFIG_CONSOLE_POLL
1028         .poll_put_char  = bfin_serial_poll_put_char,
1029         .poll_get_char  = bfin_serial_poll_get_char,
1030 #endif
1031 };
1032 
1033 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
1034 /*
1035  * If the port was already initialised (eg, by a boot loader),
1036  * try to determine the current setup.
1037  */
1038 static void __init
1039 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
1040                            int *parity, int *bits)
1041 {
1042         unsigned int status;
1043 
1044         status = UART_GET_IER(uart) & (ERBFI | ETBEI);
1045         if (status == (ERBFI | ETBEI)) {
1046                 /* ok, the port was enabled */
1047                 u32 lcr, clk;
1048 
1049                 lcr = UART_GET_LCR(uart);
1050 
1051                 *parity = 'n';
1052                 if (lcr & PEN) {
1053                         if (lcr & EPS)
1054                                 *parity = 'e';
1055                         else
1056                                 *parity = 'o';
1057                 }
1058                 *bits = ((lcr & WLS_MASK) >> WLS_OFFSET) + 5;
1059 
1060                 /* Set DLAB in LCR to Access CLK */
1061                 UART_SET_DLAB(uart);
1062 
1063                 clk = UART_GET_CLK(uart);
1064 
1065                 /* Clear DLAB in LCR to Access THR RBR IER */
1066                 UART_CLEAR_DLAB(uart);
1067 
1068                 *baud = get_sclk() / (16*clk);
1069         }
1070         pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits);
1071 }
1072 
1073 static struct uart_driver bfin_serial_reg;
1074 
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 }
1082 
1083 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1084                  defined (CONFIG_EARLY_PRINTK) */
1085 
1086 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1087 #define CLASS_BFIN_CONSOLE      "bfin-console"
1088 /*
1089  * Interrupts are disabled on entering
1090  */
1091 static void
1092 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1093 {
1094         struct bfin_serial_port *uart = bfin_serial_ports[co->index];
1095         unsigned long flags;
1096 
1097         spin_lock_irqsave(&uart->port.lock, flags);
1098         uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1099         spin_unlock_irqrestore(&uart->port.lock, flags);
1100 
1101 }
1102 
1103 static int __init
1104 bfin_serial_console_setup(struct console *co, char *options)
1105 {
1106         struct bfin_serial_port *uart;
1107         int baud = 57600;
1108         int bits = 8;
1109         int parity = 'n';
1110 # if defined(SERIAL_BFIN_CTSRTS) || \
1111         defined(SERIAL_BFIN_HARD_CTSRTS)
1112         int flow = 'r';
1113 # else
1114         int flow = 'n';
1115 # endif
1116 
1117         /*
1118          * Check whether an invalid uart number has been specified, and
1119          * if so, search for the first available port that does have
1120          * console support.
1121          */
1122         if (co->index < 0 || co->index >= BFIN_UART_NR_PORTS)
1123                 return -ENODEV;
1124 
1125         uart = bfin_serial_ports[co->index];
1126         if (!uart)
1127                 return -ENODEV;
1128 
1129         if (options)
1130                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1131         else
1132                 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1133 
1134         return uart_set_options(&uart->port, co, baud, parity, bits, flow);
1135 }
1136 
1137 static struct console bfin_serial_console = {
1138         .name           = BFIN_SERIAL_DEV_NAME,
1139         .write          = bfin_serial_console_write,
1140         .device         = uart_console_device,
1141         .setup          = bfin_serial_console_setup,
1142         .flags          = CON_PRINTBUFFER,
1143         .index          = -1,
1144         .data           = &bfin_serial_reg,
1145 };
1146 #define BFIN_SERIAL_CONSOLE     (&bfin_serial_console)
1147 #else
1148 #define BFIN_SERIAL_CONSOLE     NULL
1149 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1150 
1151 #ifdef  CONFIG_EARLY_PRINTK
1152 static struct bfin_serial_port bfin_earlyprintk_port;
1153 #define CLASS_BFIN_EARLYPRINTK  "bfin-earlyprintk"
1154 
1155 /*
1156  * Interrupts are disabled on entering
1157  */
1158 static void
1159 bfin_earlyprintk_console_write(struct console *co, const char *s, unsigned int count)
1160 {
1161         unsigned long flags;
1162 
1163         if (bfin_earlyprintk_port.port.line != co->index)
1164                 return;
1165 
1166         spin_lock_irqsave(&bfin_earlyprintk_port.port.lock, flags);
1167         uart_console_write(&bfin_earlyprintk_port.port, s, count,
1168                 bfin_serial_console_putchar);
1169         spin_unlock_irqrestore(&bfin_earlyprintk_port.port.lock, flags);
1170 }
1171 
1172 /*
1173  * This should have a .setup or .early_setup in it, but then things get called
1174  * without the command line options, and the baud rate gets messed up - so
1175  * don't let the common infrastructure play with things. (see calls to setup
1176  * & earlysetup in ./kernel/printk.c:register_console()
1177  */
1178 static struct console bfin_early_serial_console __initdata = {
1179         .name = "early_BFuart",
1180         .write = bfin_earlyprintk_console_write,
1181         .device = uart_console_device,
1182         .flags = CON_PRINTBUFFER,
1183         .index = -1,
1184         .data  = &bfin_serial_reg,
1185 };
1186 #endif
1187 
1188 static struct uart_driver bfin_serial_reg = {
1189         .owner                  = THIS_MODULE,
1190         .driver_name            = DRIVER_NAME,
1191         .dev_name               = BFIN_SERIAL_DEV_NAME,
1192         .major                  = BFIN_SERIAL_MAJOR,
1193         .minor                  = BFIN_SERIAL_MINOR,
1194         .nr                     = BFIN_UART_NR_PORTS,
1195         .cons                   = BFIN_SERIAL_CONSOLE,
1196 };
1197 
1198 static int bfin_serial_suspend(struct platform_device *pdev, pm_message_t state)
1199 {
1200         struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1201 
1202         return uart_suspend_port(&bfin_serial_reg, &uart->port);
1203 }
1204 
1205 static int bfin_serial_resume(struct platform_device *pdev)
1206 {
1207         struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1208 
1209         return uart_resume_port(&bfin_serial_reg, &uart->port);
1210 }
1211 
1212 static int bfin_serial_probe(struct platform_device *pdev)
1213 {
1214         struct resource *res;
1215         struct bfin_serial_port *uart = NULL;
1216         int ret = 0;
1217 
1218         if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
1219                 dev_err(&pdev->dev, "Wrong bfin uart platform device id.\n");
1220                 return -ENOENT;
1221         }
1222 
1223         if (bfin_serial_ports[pdev->id] == NULL) {
1224 
1225                 uart = kzalloc(sizeof(*uart), GFP_KERNEL);
1226                 if (!uart) {
1227                         dev_err(&pdev->dev,
1228                                 "fail to malloc bfin_serial_port\n");
1229                         return -ENOMEM;
1230                 }
1231                 bfin_serial_ports[pdev->id] = uart;
1232 
1233 #ifdef CONFIG_EARLY_PRINTK
1234                 if (!(bfin_earlyprintk_port.port.membase
1235                         && bfin_earlyprintk_port.port.line == pdev->id)) {
1236                         /*
1237                          * If the peripheral PINs of current port is allocated
1238                          * in earlyprintk probe stage, don't do it again.
1239                          */
1240 #endif
1241                 ret = peripheral_request_list(
1242                         dev_get_platdata(&pdev->dev),
1243                         DRIVER_NAME);
1244                 if (ret) {
1245                         dev_err(&pdev->dev,
1246                                 "fail to request bfin serial peripherals\n");
1247                         goto out_error_free_mem;
1248                 }
1249 #ifdef CONFIG_EARLY_PRINTK
1250                 }
1251 #endif
1252 
1253                 spin_lock_init(&uart->port.lock);
1254                 uart->port.uartclk   = get_sclk();
1255                 uart->port.fifosize  = BFIN_UART_TX_FIFO_SIZE;
1256                 uart->port.ops       = &bfin_serial_pops;
1257                 uart->port.line      = pdev->id;
1258                 uart->port.iotype    = UPIO_MEM;
1259                 uart->port.flags     = UPF_BOOT_AUTOCONF;
1260 
1261                 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1262                 if (res == NULL) {
1263                         dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
1264                         ret = -ENOENT;
1265                         goto out_error_free_peripherals;
1266                 }
1267 
1268                 uart->port.membase = ioremap(res->start, resource_size(res));
1269                 if (!uart->port.membase) {
1270                         dev_err(&pdev->dev, "Cannot map uart IO\n");
1271                         ret = -ENXIO;
1272                         goto out_error_free_peripherals;
1273                 }
1274                 uart->port.mapbase = res->start;
1275 
1276                 uart->tx_irq = platform_get_irq(pdev, 0);
1277                 if (uart->tx_irq < 0) {
1278                         dev_err(&pdev->dev, "No uart TX IRQ specified\n");
1279                         ret = -ENOENT;
1280                         goto out_error_unmap;
1281                 }
1282 
1283                 uart->rx_irq = platform_get_irq(pdev, 1);
1284                 if (uart->rx_irq < 0) {
1285                         dev_err(&pdev->dev, "No uart RX IRQ specified\n");
1286                         ret = -ENOENT;
1287                         goto out_error_unmap;
1288                 }
1289                 uart->port.irq = uart->rx_irq;
1290 
1291                 uart->status_irq = platform_get_irq(pdev, 2);
1292                 if (uart->status_irq < 0) {
1293                         dev_err(&pdev->dev, "No uart status IRQ specified\n");
1294                         ret = -ENOENT;
1295                         goto out_error_unmap;
1296                 }
1297 
1298 #ifdef CONFIG_SERIAL_BFIN_DMA
1299                 spin_lock_init(&uart->rx_lock);
1300                 uart->tx_done       = 1;
1301                 uart->tx_count      = 0;
1302 
1303                 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
1304                 if (res == NULL) {
1305                         dev_err(&pdev->dev, "No uart TX DMA channel specified\n");
1306                         ret = -ENOENT;
1307                         goto out_error_unmap;
1308                 }
1309                 uart->tx_dma_channel = res->start;
1310 
1311                 res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
1312                 if (res == NULL) {
1313                         dev_err(&pdev->dev, "No uart RX DMA channel specified\n");
1314                         ret = -ENOENT;
1315                         goto out_error_unmap;
1316                 }
1317                 uart->rx_dma_channel = res->start;
1318 
1319                 init_timer(&(uart->rx_dma_timer));
1320 #endif
1321 
1322 #if defined(SERIAL_BFIN_CTSRTS) || \
1323         defined(SERIAL_BFIN_HARD_CTSRTS)
1324                 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
1325                 if (res == NULL)
1326                         uart->cts_pin = -1;
1327                 else
1328                         uart->cts_pin = res->start;
1329 
1330                 res = platform_get_resource(pdev, IORESOURCE_IO, 1);
1331                 if (res == NULL)
1332                         uart->rts_pin = -1;
1333                 else
1334                         uart->rts_pin = res->start;
1335 #endif
1336         }
1337 
1338 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1339         if (!is_early_platform_device(pdev)) {
1340 #endif
1341                 uart = bfin_serial_ports[pdev->id];
1342                 uart->port.dev = &pdev->dev;
1343                 dev_set_drvdata(&pdev->dev, uart);
1344                 ret = uart_add_one_port(&bfin_serial_reg, &uart->port);
1345 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1346         }
1347 #endif
1348 
1349         if (!ret)
1350                 return 0;
1351 
1352         if (uart) {
1353 out_error_unmap:
1354                 iounmap(uart->port.membase);
1355 out_error_free_peripherals:
1356                 peripheral_free_list(dev_get_platdata(&pdev->dev));
1357 out_error_free_mem:
1358                 kfree(uart);
1359                 bfin_serial_ports[pdev->id] = NULL;
1360         }
1361 
1362         return ret;
1363 }
1364 
1365 static int bfin_serial_remove(struct platform_device *pdev)
1366 {
1367         struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1368 
1369         dev_set_drvdata(&pdev->dev, NULL);
1370 
1371         if (uart) {
1372                 uart_remove_one_port(&bfin_serial_reg, &uart->port);
1373                 iounmap(uart->port.membase);
1374                 peripheral_free_list(dev_get_platdata(&pdev->dev));
1375                 kfree(uart);
1376                 bfin_serial_ports[pdev->id] = NULL;
1377         }
1378 
1379         return 0;
1380 }
1381 
1382 static struct platform_driver bfin_serial_driver = {
1383         .probe          = bfin_serial_probe,
1384         .remove         = bfin_serial_remove,
1385         .suspend        = bfin_serial_suspend,
1386         .resume         = bfin_serial_resume,
1387         .driver         = {
1388                 .name   = DRIVER_NAME,
1389         },
1390 };
1391 
1392 #if defined(CONFIG_SERIAL_BFIN_CONSOLE)
1393 static struct early_platform_driver early_bfin_serial_driver __initdata = {
1394         .class_str = CLASS_BFIN_CONSOLE,
1395         .pdrv = &bfin_serial_driver,
1396         .requested_id = EARLY_PLATFORM_ID_UNSET,
1397 };
1398 
1399 static int __init bfin_serial_rs_console_init(void)
1400 {
1401         early_platform_driver_register(&early_bfin_serial_driver, DRIVER_NAME);
1402 
1403         early_platform_driver_probe(CLASS_BFIN_CONSOLE, BFIN_UART_NR_PORTS, 0);
1404 
1405         register_console(&bfin_serial_console);
1406 
1407         return 0;
1408 }
1409 console_initcall(bfin_serial_rs_console_init);
1410 #endif
1411 
1412 #ifdef CONFIG_EARLY_PRINTK
1413 /*
1414  * Memory can't be allocated dynamically during earlyprink init stage.
1415  * So, do individual probe for earlyprink with a static uart port variable.
1416  */
1417 static int bfin_earlyprintk_probe(struct platform_device *pdev)
1418 {
1419         struct resource *res;
1420         int ret;
1421 
1422         if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
1423                 dev_err(&pdev->dev, "Wrong earlyprintk platform device id.\n");
1424                 return -ENOENT;
1425         }
1426 
1427         ret = peripheral_request_list(dev_get_platdata(&pdev->dev),
1428                                         DRIVER_NAME);
1429         if (ret) {
1430                 dev_err(&pdev->dev,
1431                                 "fail to request bfin serial peripherals\n");
1432                         return ret;
1433         }
1434 
1435         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1436         if (res == NULL) {
1437                 dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
1438                 ret = -ENOENT;
1439                 goto out_error_free_peripherals;
1440         }
1441 
1442         bfin_earlyprintk_port.port.membase = ioremap(res->start,
1443                                                      resource_size(res));
1444         if (!bfin_earlyprintk_port.port.membase) {
1445                 dev_err(&pdev->dev, "Cannot map uart IO\n");
1446                 ret = -ENXIO;
1447                 goto out_error_free_peripherals;
1448         }
1449         bfin_earlyprintk_port.port.mapbase = res->start;
1450         bfin_earlyprintk_port.port.line = pdev->id;
1451         bfin_earlyprintk_port.port.uartclk = get_sclk();
1452         bfin_earlyprintk_port.port.fifosize  = BFIN_UART_TX_FIFO_SIZE;
1453         spin_lock_init(&bfin_earlyprintk_port.port.lock);
1454 
1455         return 0;
1456 
1457 out_error_free_peripherals:
1458         peripheral_free_list(dev_get_platdata(&pdev->dev));
1459 
1460         return ret;
1461 }
1462 
1463 static struct platform_driver bfin_earlyprintk_driver = {
1464         .probe          = bfin_earlyprintk_probe,
1465         .driver         = {
1466                 .name   = DRIVER_NAME,
1467                 .owner  = THIS_MODULE,
1468         },
1469 };
1470 
1471 static struct early_platform_driver early_bfin_earlyprintk_driver __initdata = {
1472         .class_str = CLASS_BFIN_EARLYPRINTK,
1473         .pdrv = &bfin_earlyprintk_driver,
1474         .requested_id = EARLY_PLATFORM_ID_UNSET,
1475 };
1476 
1477 struct console __init *bfin_earlyserial_init(unsigned int port,
1478                                                 unsigned int cflag)
1479 {
1480         struct ktermios t;
1481         char port_name[20];
1482 
1483         if (port < 0 || port >= BFIN_UART_NR_PORTS)
1484                 return NULL;
1485 
1486         /*
1487          * Only probe resource of the given port in earlyprintk boot arg.
1488          * The expected port id should be indicated in port name string.
1489          */
1490         snprintf(port_name, 20, DRIVER_NAME ".%d", port);
1491         early_platform_driver_register(&early_bfin_earlyprintk_driver,
1492                 port_name);
1493         early_platform_driver_probe(CLASS_BFIN_EARLYPRINTK, 1, 0);
1494 
1495         if (!bfin_earlyprintk_port.port.membase)
1496                 return NULL;
1497 
1498 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1499         /*
1500          * If we are using early serial, don't let the normal console rewind
1501          * log buffer, since that causes things to be printed multiple times
1502          */
1503         bfin_serial_console.flags &= ~CON_PRINTBUFFER;
1504 #endif
1505 
1506         bfin_early_serial_console.index = port;
1507         t.c_cflag = cflag;
1508         t.c_iflag = 0;
1509         t.c_oflag = 0;
1510         t.c_lflag = ICANON;
1511         t.c_line = port;
1512         bfin_serial_set_termios(&bfin_earlyprintk_port.port, &t, &t);
1513 
1514         return &bfin_early_serial_console;
1515 }
1516 #endif /* CONFIG_EARLY_PRINTK */
1517 
1518 static int __init bfin_serial_init(void)
1519 {
1520         int ret;
1521 
1522         pr_info("Blackfin serial driver\n");
1523 
1524         ret = uart_register_driver(&bfin_serial_reg);
1525         if (ret) {
1526                 pr_err("failed to register %s:%d\n",
1527                         bfin_serial_reg.driver_name, ret);
1528         }
1529 
1530         ret = platform_driver_register(&bfin_serial_driver);
1531         if (ret) {
1532                 pr_err("fail to register bfin uart\n");
1533                 uart_unregister_driver(&bfin_serial_reg);
1534         }
1535 
1536         return ret;
1537 }
1538 
1539 static void __exit bfin_serial_exit(void)
1540 {
1541         platform_driver_unregister(&bfin_serial_driver);
1542         uart_unregister_driver(&bfin_serial_reg);
1543 }
1544 
1545 
1546 module_init(bfin_serial_init);
1547 module_exit(bfin_serial_exit);
1548 
1549 MODULE_AUTHOR("Sonic Zhang, Aubrey Li");
1550 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1551 MODULE_LICENSE("GPL");
1552 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);
1553 MODULE_ALIAS("platform:bfin-uart");
1554 

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