Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

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(CONFIG_SERIAL_BFIN_CTSRTS) || \
 78         defined(CONFIG_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 CONFIG_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 struct timeval anomaly_start = { .tv_sec = 0 };
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.tv_sec) {
250                         struct timeval curr;
251                         suseconds_t usecs;
252 
253                         if ((~ch & (~ch + 1)) & 0xff)
254                                 goto known_good_char;
255 
256                         do_gettimeofday(&curr);
257                         if (curr.tv_sec - anomaly_start.tv_sec > 1)
258                                 goto known_good_char;
259 
260                         usecs = 0;
261                         if (curr.tv_sec != anomaly_start.tv_sec)
262                                 usecs += USEC_PER_SEC;
263                         usecs += curr.tv_usec - anomaly_start.tv_usec;
264 
265                         if (usecs > UART_GET_ANOMALY_THRESHOLD(uart))
266                                 goto known_good_char;
267 
268                         if (ch)
269                                 anomaly_start.tv_sec = 0;
270                         else
271                                 anomaly_start = curr;
272 
273                         return;
274 
275  known_good_char:
276                         status &= ~BI;
277                         anomaly_start.tv_sec = 0;
278                 }
279         }
280 
281         if (status & BI) {
282                 if (ANOMALY_05000363)
283                         if (bfin_revid() < 5)
284                                 do_gettimeofday(&anomaly_start);
285                 uart->port.icount.brk++;
286                 if (uart_handle_break(&uart->port))
287                         goto ignore_char;
288                 status &= ~(PE | FE);
289         }
290         if (status & PE)
291                 uart->port.icount.parity++;
292         if (status & OE)
293                 uart->port.icount.overrun++;
294         if (status & FE)
295                 uart->port.icount.frame++;
296 
297         status &= uart->port.read_status_mask;
298 
299         if (status & BI)
300                 flg = TTY_BREAK;
301         else if (status & PE)
302                 flg = TTY_PARITY;
303         else if (status & FE)
304                 flg = TTY_FRAME;
305         else
306                 flg = TTY_NORMAL;
307 
308         if (uart_handle_sysrq_char(&uart->port, ch))
309                 goto ignore_char;
310 
311         uart_insert_char(&uart->port, status, OE, ch, flg);
312 
313  ignore_char:
314         tty_flip_buffer_push(&uart->port.state->port);
315 }
316 
317 static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
318 {
319         struct circ_buf *xmit = &uart->port.state->xmit;
320 
321         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
322 #if defined(CONFIG_BF54x) || defined(CONFIG_BF60x)
323                 /* Clear TFI bit */
324                 UART_PUT_LSR(uart, TFI);
325 #endif
326                 /* Anomaly notes:
327                  *  05000215 -  we always clear ETBEI within last UART TX
328                  *              interrupt to end a string. It is always set
329                  *              when start a new tx.
330                  */
331                 UART_CLEAR_IER(uart, ETBEI);
332                 return;
333         }
334 
335         if (uart->port.x_char) {
336                 UART_PUT_CHAR(uart, uart->port.x_char);
337                 uart->port.icount.tx++;
338                 uart->port.x_char = 0;
339         }
340 
341         while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
342                 UART_PUT_CHAR(uart, xmit->buf[xmit->tail]);
343                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
344                 uart->port.icount.tx++;
345         }
346 
347         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
348                 uart_write_wakeup(&uart->port);
349 }
350 
351 static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
352 {
353         struct bfin_serial_port *uart = dev_id;
354 
355         while (UART_GET_LSR(uart) & DR)
356                 bfin_serial_rx_chars(uart);
357 
358         return IRQ_HANDLED;
359 }
360 
361 static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
362 {
363         struct bfin_serial_port *uart = dev_id;
364 
365         spin_lock(&uart->port.lock);
366         if (UART_GET_LSR(uart) & THRE)
367                 bfin_serial_tx_chars(uart);
368         spin_unlock(&uart->port.lock);
369 
370         return IRQ_HANDLED;
371 }
372 #endif
373 
374 #ifdef CONFIG_SERIAL_BFIN_DMA
375 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
376 {
377         struct circ_buf *xmit = &uart->port.state->xmit;
378 
379         uart->tx_done = 0;
380 
381         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
382                 uart->tx_count = 0;
383                 uart->tx_done = 1;
384                 return;
385         }
386 
387         if (uart->port.x_char) {
388                 UART_PUT_CHAR(uart, uart->port.x_char);
389                 uart->port.icount.tx++;
390                 uart->port.x_char = 0;
391         }
392 
393         uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
394         if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
395                 uart->tx_count = UART_XMIT_SIZE - xmit->tail;
396         blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
397                                         (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
398         set_dma_config(uart->tx_dma_channel,
399                 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
400                         INTR_ON_BUF,
401                         DIMENSION_LINEAR,
402                         DATA_SIZE_8,
403                         DMA_SYNC_RESTART));
404         set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
405         set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
406         set_dma_x_modify(uart->tx_dma_channel, 1);
407         SSYNC();
408         enable_dma(uart->tx_dma_channel);
409 
410         UART_SET_IER(uart, ETBEI);
411 }
412 
413 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
414 {
415         int i, flg, status;
416 
417         status = UART_GET_LSR(uart);
418         UART_CLEAR_LSR(uart);
419 
420         uart->port.icount.rx +=
421                 CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail,
422                 UART_XMIT_SIZE);
423 
424         if (status & BI) {
425                 uart->port.icount.brk++;
426                 if (uart_handle_break(&uart->port))
427                         goto dma_ignore_char;
428                 status &= ~(PE | FE);
429         }
430         if (status & PE)
431                 uart->port.icount.parity++;
432         if (status & OE)
433                 uart->port.icount.overrun++;
434         if (status & FE)
435                 uart->port.icount.frame++;
436 
437         status &= uart->port.read_status_mask;
438 
439         if (status & BI)
440                 flg = TTY_BREAK;
441         else if (status & PE)
442                 flg = TTY_PARITY;
443         else if (status & FE)
444                 flg = TTY_FRAME;
445         else
446                 flg = TTY_NORMAL;
447 
448         for (i = uart->rx_dma_buf.tail; ; i++) {
449                 if (i >= UART_XMIT_SIZE)
450                         i = 0;
451                 if (i == uart->rx_dma_buf.head)
452                         break;
453                 if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
454                         uart_insert_char(&uart->port, status, OE,
455                                 uart->rx_dma_buf.buf[i], flg);
456         }
457 
458  dma_ignore_char:
459         tty_flip_buffer_push(&uart->port.state->port);
460 }
461 
462 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
463 {
464         int x_pos, pos;
465         unsigned long flags;
466 
467         spin_lock_irqsave(&uart->rx_lock, flags);
468 
469         /* 2D DMA RX buffer ring is used. Because curr_y_count and
470          * curr_x_count can't be read as an atomic operation,
471          * curr_y_count should be read before curr_x_count. When
472          * curr_x_count is read, curr_y_count may already indicate
473          * next buffer line. But, the position calculated here is
474          * still indicate the old line. The wrong position data may
475          * be smaller than current buffer tail, which cause garbages
476          * are received if it is not prohibit.
477          */
478         uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
479         x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
480         uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
481         if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
482                 uart->rx_dma_nrows = 0;
483         x_pos = DMA_RX_XCOUNT - x_pos;
484         if (x_pos == DMA_RX_XCOUNT)
485                 x_pos = 0;
486 
487         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
488         /* Ignore receiving data if new position is in the same line of
489          * current buffer tail and small.
490          */
491         if (pos > uart->rx_dma_buf.tail ||
492                 uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
493                 uart->rx_dma_buf.head = pos;
494                 bfin_serial_dma_rx_chars(uart);
495                 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
496         }
497 
498         spin_unlock_irqrestore(&uart->rx_lock, flags);
499 
500         mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES);
501 }
502 
503 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
504 {
505         struct bfin_serial_port *uart = dev_id;
506         struct circ_buf *xmit = &uart->port.state->xmit;
507 
508         spin_lock(&uart->port.lock);
509         if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
510                 disable_dma(uart->tx_dma_channel);
511                 clear_dma_irqstat(uart->tx_dma_channel);
512                 /* Anomaly notes:
513                  *  05000215 -  we always clear ETBEI within last UART TX
514                  *              interrupt to end a string. It is always set
515                  *              when start a new tx.
516                  */
517                 UART_CLEAR_IER(uart, ETBEI);
518                 uart->port.icount.tx += uart->tx_count;
519                 if (!(xmit->tail == 0 && xmit->head == 0)) {
520                         xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
521 
522                         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
523                                 uart_write_wakeup(&uart->port);
524                 }
525 
526                 bfin_serial_dma_tx_chars(uart);
527         }
528 
529         spin_unlock(&uart->port.lock);
530         return IRQ_HANDLED;
531 }
532 
533 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
534 {
535         struct bfin_serial_port *uart = dev_id;
536         unsigned int irqstat;
537         int x_pos, pos;
538 
539         spin_lock(&uart->rx_lock);
540         irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
541         clear_dma_irqstat(uart->rx_dma_channel);
542 
543         uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
544         x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
545         uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
546         if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
547                 uart->rx_dma_nrows = 0;
548 
549         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT;
550         if (pos > uart->rx_dma_buf.tail ||
551                 uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
552                 uart->rx_dma_buf.head = pos;
553                 bfin_serial_dma_rx_chars(uart);
554                 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
555         }
556 
557         spin_unlock(&uart->rx_lock);
558 
559         return IRQ_HANDLED;
560 }
561 #endif
562 
563 /*
564  * Return TIOCSER_TEMT when transmitter is not busy.
565  */
566 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
567 {
568         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
569         unsigned int lsr;
570 
571         lsr = UART_GET_LSR(uart);
572         if (lsr & TEMT)
573                 return TIOCSER_TEMT;
574         else
575                 return 0;
576 }
577 
578 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
579 {
580         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
581         u32 lcr = UART_GET_LCR(uart);
582         if (break_state)
583                 lcr |= SB;
584         else
585                 lcr &= ~SB;
586         UART_PUT_LCR(uart, lcr);
587         SSYNC();
588 }
589 
590 static int bfin_serial_startup(struct uart_port *port)
591 {
592         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
593 
594 #ifdef CONFIG_SERIAL_BFIN_DMA
595         dma_addr_t dma_handle;
596 
597         if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
598                 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
599                 return -EBUSY;
600         }
601 
602         if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
603                 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
604                 free_dma(uart->rx_dma_channel);
605                 return -EBUSY;
606         }
607 
608         set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
609         set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
610 
611         uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
612         uart->rx_dma_buf.head = 0;
613         uart->rx_dma_buf.tail = 0;
614         uart->rx_dma_nrows = 0;
615 
616         set_dma_config(uart->rx_dma_channel,
617                 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
618                                 INTR_ON_ROW, DIMENSION_2D,
619                                 DATA_SIZE_8,
620                                 DMA_SYNC_RESTART));
621         set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
622         set_dma_x_modify(uart->rx_dma_channel, 1);
623         set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
624         set_dma_y_modify(uart->rx_dma_channel, 1);
625         set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
626         enable_dma(uart->rx_dma_channel);
627 
628         uart->rx_dma_timer.data = (unsigned long)(uart);
629         uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
630         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
631         add_timer(&(uart->rx_dma_timer));
632 #else
633 # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
634         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
635         if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled)
636                 kgdboc_break_enabled = 0;
637         else {
638 # endif
639         if (request_irq(uart->rx_irq, bfin_serial_rx_int, 0,
640              "BFIN_UART_RX", uart)) {
641                 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
642                 return -EBUSY;
643         }
644 
645         if (request_irq
646             (uart->tx_irq, bfin_serial_tx_int, 0,
647              "BFIN_UART_TX", uart)) {
648                 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
649                 free_irq(uart->rx_irq, uart);
650                 return -EBUSY;
651         }
652 
653 # ifdef CONFIG_BF54x
654         {
655                 /*
656                  * UART2 and UART3 on BF548 share interrupt PINs and DMA
657                  * controllers with SPORT2 and SPORT3. UART rx and tx
658                  * interrupts are generated in PIO mode only when configure
659                  * their peripheral mapping registers properly, which means
660                  * request corresponding DMA channels in PIO mode as well.
661                  */
662                 unsigned uart_dma_ch_rx, uart_dma_ch_tx;
663 
664                 switch (uart->rx_irq) {
665                 case IRQ_UART3_RX:
666                         uart_dma_ch_rx = CH_UART3_RX;
667                         uart_dma_ch_tx = CH_UART3_TX;
668                         break;
669                 case IRQ_UART2_RX:
670                         uart_dma_ch_rx = CH_UART2_RX;
671                         uart_dma_ch_tx = CH_UART2_TX;
672                         break;
673                 default:
674                         uart_dma_ch_rx = uart_dma_ch_tx = 0;
675                         break;
676                 }
677 
678                 if (uart_dma_ch_rx &&
679                         request_dma(uart_dma_ch_rx, "BFIN_UART_RX") < 0) {
680                         printk(KERN_NOTICE"Fail to attach UART interrupt\n");
681                         free_irq(uart->rx_irq, uart);
682                         free_irq(uart->tx_irq, uart);
683                         return -EBUSY;
684                 }
685                 if (uart_dma_ch_tx &&
686                         request_dma(uart_dma_ch_tx, "BFIN_UART_TX") < 0) {
687                         printk(KERN_NOTICE "Fail to attach UART interrupt\n");
688                         free_dma(uart_dma_ch_rx);
689                         free_irq(uart->rx_irq, uart);
690                         free_irq(uart->tx_irq, uart);
691                         return -EBUSY;
692                 }
693         }
694 # endif
695 # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
696         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
697         }
698 # endif
699 #endif
700 
701 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
702         if (uart->cts_pin >= 0) {
703                 if (request_irq(gpio_to_irq(uart->cts_pin),
704                         bfin_serial_mctrl_cts_int,
705                         IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
706                         0, "BFIN_UART_CTS", uart)) {
707                         uart->cts_pin = -1;
708                         pr_info("Unable to attach BlackFin UART CTS interrupt. So, disable it.\n");
709                 }
710         }
711         if (uart->rts_pin >= 0) {
712                 if (gpio_request(uart->rts_pin, DRIVER_NAME)) {
713                         pr_info("fail to request RTS PIN at GPIO_%d\n", uart->rts_pin);
714                         uart->rts_pin = -1;
715                 } else
716                         gpio_direction_output(uart->rts_pin, 0);
717         }
718 #endif
719 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
720         if (uart->cts_pin >= 0) {
721                 if (request_irq(uart->status_irq, bfin_serial_mctrl_cts_int,
722                         0, "BFIN_UART_MODEM_STATUS", uart)) {
723                         uart->cts_pin = -1;
724                         dev_info(port->dev, "Unable to attach BlackFin UART Modem Status interrupt.\n");
725                 }
726 
727                 /* CTS RTS PINs are negative assertive. */
728                 UART_PUT_MCR(uart, UART_GET_MCR(uart) | ACTS);
729                 UART_SET_IER(uart, EDSSI);
730         }
731 #endif
732 
733         UART_SET_IER(uart, ERBFI);
734         return 0;
735 }
736 
737 static void bfin_serial_shutdown(struct uart_port *port)
738 {
739         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
740 
741 #ifdef CONFIG_SERIAL_BFIN_DMA
742         disable_dma(uart->tx_dma_channel);
743         free_dma(uart->tx_dma_channel);
744         disable_dma(uart->rx_dma_channel);
745         free_dma(uart->rx_dma_channel);
746         del_timer(&(uart->rx_dma_timer));
747         dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
748 #else
749 #ifdef CONFIG_BF54x
750         switch (uart->port.irq) {
751         case IRQ_UART3_RX:
752                 free_dma(CH_UART3_RX);
753                 free_dma(CH_UART3_TX);
754                 break;
755         case IRQ_UART2_RX:
756                 free_dma(CH_UART2_RX);
757                 free_dma(CH_UART2_TX);
758                 break;
759         default:
760                 break;
761         }
762 #endif
763         free_irq(uart->rx_irq, uart);
764         free_irq(uart->tx_irq, uart);
765 #endif
766 
767 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
768         if (uart->cts_pin >= 0)
769                 free_irq(gpio_to_irq(uart->cts_pin), uart);
770         if (uart->rts_pin >= 0)
771                 gpio_free(uart->rts_pin);
772 #endif
773 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
774         if (uart->cts_pin >= 0)
775                 free_irq(uart->status_irq, uart);
776 #endif
777 }
778 
779 static void
780 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
781                    struct ktermios *old)
782 {
783         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
784         unsigned long flags;
785         unsigned int baud, quot;
786         unsigned int ier, lcr = 0;
787         unsigned long timeout;
788 
789 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
790         if (old == NULL && uart->cts_pin != -1)
791                 termios->c_cflag |= CRTSCTS;
792         else if (uart->cts_pin == -1)
793                 termios->c_cflag &= ~CRTSCTS;
794 #endif
795 
796         switch (termios->c_cflag & CSIZE) {
797         case CS8:
798                 lcr = WLS(8);
799                 break;
800         case CS7:
801                 lcr = WLS(7);
802                 break;
803         case CS6:
804                 lcr = WLS(6);
805                 break;
806         case CS5:
807                 lcr = WLS(5);
808                 break;
809         default:
810                 printk(KERN_ERR "%s: word length not supported\n",
811                         __func__);
812         }
813 
814         /* Anomaly notes:
815          *  05000231 -  STOP bit is always set to 1 whatever the user is set.
816          */
817         if (termios->c_cflag & CSTOPB) {
818                 if (ANOMALY_05000231)
819                         printk(KERN_WARNING "STOP bits other than 1 is not "
820                                 "supported in case of anomaly 05000231.\n");
821                 else
822                         lcr |= STB;
823         }
824         if (termios->c_cflag & PARENB)
825                 lcr |= PEN;
826         if (!(termios->c_cflag & PARODD))
827                 lcr |= EPS;
828         if (termios->c_cflag & CMSPAR)
829                 lcr |= STP;
830 
831         spin_lock_irqsave(&uart->port.lock, flags);
832 
833         port->read_status_mask = OE;
834         if (termios->c_iflag & INPCK)
835                 port->read_status_mask |= (FE | PE);
836         if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
837                 port->read_status_mask |= BI;
838 
839         /*
840          * Characters to ignore
841          */
842         port->ignore_status_mask = 0;
843         if (termios->c_iflag & IGNPAR)
844                 port->ignore_status_mask |= FE | PE;
845         if (termios->c_iflag & IGNBRK) {
846                 port->ignore_status_mask |= BI;
847                 /*
848                  * If we're ignoring parity and break indicators,
849                  * ignore overruns too (for real raw support).
850                  */
851                 if (termios->c_iflag & IGNPAR)
852                         port->ignore_status_mask |= OE;
853         }
854 
855         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
856         quot = uart_get_divisor(port, baud);
857 
858         /* If discipline is not IRDA, apply ANOMALY_05000230 */
859         if (termios->c_line != N_IRDA)
860                 quot -= ANOMALY_05000230;
861 
862         UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
863 
864         /* Wait till the transfer buffer is empty */
865         timeout = jiffies + msecs_to_jiffies(10);
866         while (UART_GET_GCTL(uart) & UCEN && !(UART_GET_LSR(uart) & TEMT))
867                 if (time_after(jiffies, timeout)) {
868                         dev_warn(port->dev, "timeout waiting for TX buffer empty\n");
869                         break;
870                 }
871 
872         /* Disable UART */
873         ier = UART_GET_IER(uart);
874         UART_PUT_GCTL(uart, UART_GET_GCTL(uart) & ~UCEN);
875         UART_DISABLE_INTS(uart);
876 
877         /* Set DLAB in LCR to Access CLK */
878         UART_SET_DLAB(uart);
879 
880         UART_PUT_CLK(uart, quot);
881         SSYNC();
882 
883         /* Clear DLAB in LCR to Access THR RBR IER */
884         UART_CLEAR_DLAB(uart);
885 
886         UART_PUT_LCR(uart, (UART_GET_LCR(uart) & ~LCR_MASK) | lcr);
887 
888         /* Enable UART */
889         UART_ENABLE_INTS(uart, ier);
890         UART_PUT_GCTL(uart, UART_GET_GCTL(uart) | UCEN);
891 
892         /* Port speed changed, update the per-port timeout. */
893         uart_update_timeout(port, termios->c_cflag, baud);
894 
895         spin_unlock_irqrestore(&uart->port.lock, flags);
896 }
897 
898 static const char *bfin_serial_type(struct uart_port *port)
899 {
900         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
901 
902         return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
903 }
904 
905 /*
906  * Release the memory region(s) being used by 'port'.
907  */
908 static void bfin_serial_release_port(struct uart_port *port)
909 {
910 }
911 
912 /*
913  * Request the memory region(s) being used by 'port'.
914  */
915 static int bfin_serial_request_port(struct uart_port *port)
916 {
917         return 0;
918 }
919 
920 /*
921  * Configure/autoconfigure the port.
922  */
923 static void bfin_serial_config_port(struct uart_port *port, int flags)
924 {
925         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
926 
927         if (flags & UART_CONFIG_TYPE &&
928             bfin_serial_request_port(&uart->port) == 0)
929                 uart->port.type = PORT_BFIN;
930 }
931 
932 /*
933  * Verify the new serial_struct (for TIOCSSERIAL).
934  * The only change we allow are to the flags and type, and
935  * even then only between PORT_BFIN and PORT_UNKNOWN
936  */
937 static int
938 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
939 {
940         return 0;
941 }
942 
943 /*
944  * Enable the IrDA function if tty->ldisc.num is N_IRDA.
945  * In other cases, disable IrDA function.
946  */
947 static void bfin_serial_set_ldisc(struct uart_port *port, int ld)
948 {
949         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
950         unsigned int val;
951 
952         switch (ld) {
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(CONFIG_SERIAL_BFIN_CTSRTS) || \
1111         defined(CONFIG_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(CONFIG_SERIAL_BFIN_CTSRTS) || \
1323         defined(CONFIG_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                 .owner  = THIS_MODULE,
1390         },
1391 };
1392 
1393 #if defined(CONFIG_SERIAL_BFIN_CONSOLE)
1394 static struct early_platform_driver early_bfin_serial_driver __initdata = {
1395         .class_str = CLASS_BFIN_CONSOLE,
1396         .pdrv = &bfin_serial_driver,
1397         .requested_id = EARLY_PLATFORM_ID_UNSET,
1398 };
1399 
1400 static int __init bfin_serial_rs_console_init(void)
1401 {
1402         early_platform_driver_register(&early_bfin_serial_driver, DRIVER_NAME);
1403 
1404         early_platform_driver_probe(CLASS_BFIN_CONSOLE, BFIN_UART_NR_PORTS, 0);
1405 
1406         register_console(&bfin_serial_console);
1407 
1408         return 0;
1409 }
1410 console_initcall(bfin_serial_rs_console_init);
1411 #endif
1412 
1413 #ifdef CONFIG_EARLY_PRINTK
1414 /*
1415  * Memory can't be allocated dynamically during earlyprink init stage.
1416  * So, do individual probe for earlyprink with a static uart port variable.
1417  */
1418 static int bfin_earlyprintk_probe(struct platform_device *pdev)
1419 {
1420         struct resource *res;
1421         int ret;
1422 
1423         if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
1424                 dev_err(&pdev->dev, "Wrong earlyprintk platform device id.\n");
1425                 return -ENOENT;
1426         }
1427 
1428         ret = peripheral_request_list(dev_get_platdata(&pdev->dev),
1429                                         DRIVER_NAME);
1430         if (ret) {
1431                 dev_err(&pdev->dev,
1432                                 "fail to request bfin serial peripherals\n");
1433                         return ret;
1434         }
1435 
1436         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1437         if (res == NULL) {
1438                 dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
1439                 ret = -ENOENT;
1440                 goto out_error_free_peripherals;
1441         }
1442 
1443         bfin_earlyprintk_port.port.membase = ioremap(res->start,
1444                                                      resource_size(res));
1445         if (!bfin_earlyprintk_port.port.membase) {
1446                 dev_err(&pdev->dev, "Cannot map uart IO\n");
1447                 ret = -ENXIO;
1448                 goto out_error_free_peripherals;
1449         }
1450         bfin_earlyprintk_port.port.mapbase = res->start;
1451         bfin_earlyprintk_port.port.line = pdev->id;
1452         bfin_earlyprintk_port.port.uartclk = get_sclk();
1453         bfin_earlyprintk_port.port.fifosize  = BFIN_UART_TX_FIFO_SIZE;
1454         spin_lock_init(&bfin_earlyprintk_port.port.lock);
1455 
1456         return 0;
1457 
1458 out_error_free_peripherals:
1459         peripheral_free_list(dev_get_platdata(&pdev->dev));
1460 
1461         return ret;
1462 }
1463 
1464 static struct platform_driver bfin_earlyprintk_driver = {
1465         .probe          = bfin_earlyprintk_probe,
1466         .driver         = {
1467                 .name   = DRIVER_NAME,
1468                 .owner  = THIS_MODULE,
1469         },
1470 };
1471 
1472 static struct early_platform_driver early_bfin_earlyprintk_driver __initdata = {
1473         .class_str = CLASS_BFIN_EARLYPRINTK,
1474         .pdrv = &bfin_earlyprintk_driver,
1475         .requested_id = EARLY_PLATFORM_ID_UNSET,
1476 };
1477 
1478 struct console __init *bfin_earlyserial_init(unsigned int port,
1479                                                 unsigned int cflag)
1480 {
1481         struct ktermios t;
1482         char port_name[20];
1483 
1484         if (port < 0 || port >= BFIN_UART_NR_PORTS)
1485                 return NULL;
1486 
1487         /*
1488          * Only probe resource of the given port in earlyprintk boot arg.
1489          * The expected port id should be indicated in port name string.
1490          */
1491         snprintf(port_name, 20, DRIVER_NAME ".%d", port);
1492         early_platform_driver_register(&early_bfin_earlyprintk_driver,
1493                 port_name);
1494         early_platform_driver_probe(CLASS_BFIN_EARLYPRINTK, 1, 0);
1495 
1496         if (!bfin_earlyprintk_port.port.membase)
1497                 return NULL;
1498 
1499 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1500         /*
1501          * If we are using early serial, don't let the normal console rewind
1502          * log buffer, since that causes things to be printed multiple times
1503          */
1504         bfin_serial_console.flags &= ~CON_PRINTBUFFER;
1505 #endif
1506 
1507         bfin_early_serial_console.index = port;
1508         t.c_cflag = cflag;
1509         t.c_iflag = 0;
1510         t.c_oflag = 0;
1511         t.c_lflag = ICANON;
1512         t.c_line = port;
1513         bfin_serial_set_termios(&bfin_earlyprintk_port.port, &t, &t);
1514 
1515         return &bfin_early_serial_console;
1516 }
1517 #endif /* CONFIG_EARLY_PRINTK */
1518 
1519 static int __init bfin_serial_init(void)
1520 {
1521         int ret;
1522 
1523         pr_info("Blackfin serial driver\n");
1524 
1525         ret = uart_register_driver(&bfin_serial_reg);
1526         if (ret) {
1527                 pr_err("failed to register %s:%d\n",
1528                         bfin_serial_reg.driver_name, ret);
1529         }
1530 
1531         ret = platform_driver_register(&bfin_serial_driver);
1532         if (ret) {
1533                 pr_err("fail to register bfin uart\n");
1534                 uart_unregister_driver(&bfin_serial_reg);
1535         }
1536 
1537         return ret;
1538 }
1539 
1540 static void __exit bfin_serial_exit(void)
1541 {
1542         platform_driver_unregister(&bfin_serial_driver);
1543         uart_unregister_driver(&bfin_serial_reg);
1544 }
1545 
1546 
1547 module_init(bfin_serial_init);
1548 module_exit(bfin_serial_exit);
1549 
1550 MODULE_AUTHOR("Sonic Zhang, Aubrey Li");
1551 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1552 MODULE_LICENSE("GPL");
1553 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);
1554 MODULE_ALIAS("platform:bfin-uart");
1555 

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