Version:  2.0.40 2.2.26 2.4.37 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 3.19 4.0 4.1

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         dma_disable_irq_nosync(uart->rx_dma_channel);
468         spin_lock_irqsave(&uart->rx_lock, flags);
469 
470         /* 2D DMA RX buffer ring is used. Because curr_y_count and
471          * curr_x_count can't be read as an atomic operation,
472          * curr_y_count should be read before curr_x_count. When
473          * curr_x_count is read, curr_y_count may already indicate
474          * next buffer line. But, the position calculated here is
475          * still indicate the old line. The wrong position data may
476          * be smaller than current buffer tail, which cause garbages
477          * are received if it is not prohibit.
478          */
479         uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
480         x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
481         uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
482         if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
483                 uart->rx_dma_nrows = 0;
484         x_pos = DMA_RX_XCOUNT - x_pos;
485         if (x_pos == DMA_RX_XCOUNT)
486                 x_pos = 0;
487 
488         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
489         /* Ignore receiving data if new position is in the same line of
490          * current buffer tail and small.
491          */
492         if (pos > uart->rx_dma_buf.tail ||
493                 uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
494                 uart->rx_dma_buf.head = pos;
495                 bfin_serial_dma_rx_chars(uart);
496                 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
497         }
498 
499         spin_unlock_irqrestore(&uart->rx_lock, flags);
500         dma_enable_irq(uart->rx_dma_channel);
501 
502         mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES);
503 }
504 
505 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
506 {
507         struct bfin_serial_port *uart = dev_id;
508         struct circ_buf *xmit = &uart->port.state->xmit;
509 
510         spin_lock(&uart->port.lock);
511         if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
512                 disable_dma(uart->tx_dma_channel);
513                 clear_dma_irqstat(uart->tx_dma_channel);
514                 /* Anomaly notes:
515                  *  05000215 -  we always clear ETBEI within last UART TX
516                  *              interrupt to end a string. It is always set
517                  *              when start a new tx.
518                  */
519                 UART_CLEAR_IER(uart, ETBEI);
520                 uart->port.icount.tx += uart->tx_count;
521                 if (!(xmit->tail == 0 && xmit->head == 0)) {
522                         xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
523 
524                         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
525                                 uart_write_wakeup(&uart->port);
526                 }
527 
528                 bfin_serial_dma_tx_chars(uart);
529         }
530 
531         spin_unlock(&uart->port.lock);
532         return IRQ_HANDLED;
533 }
534 
535 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
536 {
537         struct bfin_serial_port *uart = dev_id;
538         unsigned int irqstat;
539         int x_pos, pos;
540 
541         spin_lock(&uart->rx_lock);
542         irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
543         clear_dma_irqstat(uart->rx_dma_channel);
544 
545         uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
546         x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
547         uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
548         if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
549                 uart->rx_dma_nrows = 0;
550 
551         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT;
552         if (pos > uart->rx_dma_buf.tail ||
553                 uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
554                 uart->rx_dma_buf.head = pos;
555                 bfin_serial_dma_rx_chars(uart);
556                 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
557         }
558 
559         spin_unlock(&uart->rx_lock);
560 
561         return IRQ_HANDLED;
562 }
563 #endif
564 
565 /*
566  * Return TIOCSER_TEMT when transmitter is not busy.
567  */
568 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
569 {
570         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
571         unsigned int lsr;
572 
573         lsr = UART_GET_LSR(uart);
574         if (lsr & TEMT)
575                 return TIOCSER_TEMT;
576         else
577                 return 0;
578 }
579 
580 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
581 {
582         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
583         u32 lcr = UART_GET_LCR(uart);
584         if (break_state)
585                 lcr |= SB;
586         else
587                 lcr &= ~SB;
588         UART_PUT_LCR(uart, lcr);
589         SSYNC();
590 }
591 
592 static int bfin_serial_startup(struct uart_port *port)
593 {
594         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
595 
596 #ifdef CONFIG_SERIAL_BFIN_DMA
597         dma_addr_t dma_handle;
598 
599         if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
600                 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
601                 return -EBUSY;
602         }
603 
604         if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
605                 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
606                 free_dma(uart->rx_dma_channel);
607                 return -EBUSY;
608         }
609 
610         set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
611         set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
612 
613         uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
614         uart->rx_dma_buf.head = 0;
615         uart->rx_dma_buf.tail = 0;
616         uart->rx_dma_nrows = 0;
617 
618         set_dma_config(uart->rx_dma_channel,
619                 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
620                                 INTR_ON_ROW, DIMENSION_2D,
621                                 DATA_SIZE_8,
622                                 DMA_SYNC_RESTART));
623         set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
624         set_dma_x_modify(uart->rx_dma_channel, 1);
625         set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
626         set_dma_y_modify(uart->rx_dma_channel, 1);
627         set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
628         enable_dma(uart->rx_dma_channel);
629 
630         uart->rx_dma_timer.data = (unsigned long)(uart);
631         uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
632         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
633         add_timer(&(uart->rx_dma_timer));
634 #else
635 # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
636         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
637         if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled)
638                 kgdboc_break_enabled = 0;
639         else {
640 # endif
641         if (request_irq(uart->rx_irq, bfin_serial_rx_int, 0,
642              "BFIN_UART_RX", uart)) {
643                 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
644                 return -EBUSY;
645         }
646 
647         if (request_irq
648             (uart->tx_irq, bfin_serial_tx_int, 0,
649              "BFIN_UART_TX", uart)) {
650                 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
651                 free_irq(uart->rx_irq, uart);
652                 return -EBUSY;
653         }
654 
655 # ifdef CONFIG_BF54x
656         {
657                 /*
658                  * UART2 and UART3 on BF548 share interrupt PINs and DMA
659                  * controllers with SPORT2 and SPORT3. UART rx and tx
660                  * interrupts are generated in PIO mode only when configure
661                  * their peripheral mapping registers properly, which means
662                  * request corresponding DMA channels in PIO mode as well.
663                  */
664                 unsigned uart_dma_ch_rx, uart_dma_ch_tx;
665 
666                 switch (uart->rx_irq) {
667                 case IRQ_UART3_RX:
668                         uart_dma_ch_rx = CH_UART3_RX;
669                         uart_dma_ch_tx = CH_UART3_TX;
670                         break;
671                 case IRQ_UART2_RX:
672                         uart_dma_ch_rx = CH_UART2_RX;
673                         uart_dma_ch_tx = CH_UART2_TX;
674                         break;
675                 default:
676                         uart_dma_ch_rx = uart_dma_ch_tx = 0;
677                         break;
678                 }
679 
680                 if (uart_dma_ch_rx &&
681                         request_dma(uart_dma_ch_rx, "BFIN_UART_RX") < 0) {
682                         printk(KERN_NOTICE"Fail to attach UART interrupt\n");
683                         free_irq(uart->rx_irq, uart);
684                         free_irq(uart->tx_irq, uart);
685                         return -EBUSY;
686                 }
687                 if (uart_dma_ch_tx &&
688                         request_dma(uart_dma_ch_tx, "BFIN_UART_TX") < 0) {
689                         printk(KERN_NOTICE "Fail to attach UART interrupt\n");
690                         free_dma(uart_dma_ch_rx);
691                         free_irq(uart->rx_irq, uart);
692                         free_irq(uart->tx_irq, uart);
693                         return -EBUSY;
694                 }
695         }
696 # endif
697 # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
698         defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
699         }
700 # endif
701 #endif
702 
703 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
704         if (uart->cts_pin >= 0) {
705                 if (request_irq(gpio_to_irq(uart->cts_pin),
706                         bfin_serial_mctrl_cts_int,
707                         IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
708                         0, "BFIN_UART_CTS", uart)) {
709                         uart->cts_pin = -1;
710                         pr_info("Unable to attach BlackFin UART CTS interrupt. So, disable it.\n");
711                 }
712         }
713         if (uart->rts_pin >= 0) {
714                 if (gpio_request(uart->rts_pin, DRIVER_NAME)) {
715                         pr_info("fail to request RTS PIN at GPIO_%d\n", uart->rts_pin);
716                         uart->rts_pin = -1;
717                 } else
718                         gpio_direction_output(uart->rts_pin, 0);
719         }
720 #endif
721 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
722         if (uart->cts_pin >= 0) {
723                 if (request_irq(uart->status_irq, bfin_serial_mctrl_cts_int,
724                         0, "BFIN_UART_MODEM_STATUS", uart)) {
725                         uart->cts_pin = -1;
726                         dev_info(port->dev, "Unable to attach BlackFin UART Modem Status interrupt.\n");
727                 }
728 
729                 /* CTS RTS PINs are negative assertive. */
730                 UART_PUT_MCR(uart, UART_GET_MCR(uart) | ACTS);
731                 UART_SET_IER(uart, EDSSI);
732         }
733 #endif
734 
735         UART_SET_IER(uart, ERBFI);
736         return 0;
737 }
738 
739 static void bfin_serial_shutdown(struct uart_port *port)
740 {
741         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
742 
743 #ifdef CONFIG_SERIAL_BFIN_DMA
744         disable_dma(uart->tx_dma_channel);
745         free_dma(uart->tx_dma_channel);
746         disable_dma(uart->rx_dma_channel);
747         free_dma(uart->rx_dma_channel);
748         del_timer(&(uart->rx_dma_timer));
749         dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
750 #else
751 #ifdef CONFIG_BF54x
752         switch (uart->port.irq) {
753         case IRQ_UART3_RX:
754                 free_dma(CH_UART3_RX);
755                 free_dma(CH_UART3_TX);
756                 break;
757         case IRQ_UART2_RX:
758                 free_dma(CH_UART2_RX);
759                 free_dma(CH_UART2_TX);
760                 break;
761         default:
762                 break;
763         }
764 #endif
765         free_irq(uart->rx_irq, uart);
766         free_irq(uart->tx_irq, uart);
767 #endif
768 
769 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
770         if (uart->cts_pin >= 0)
771                 free_irq(gpio_to_irq(uart->cts_pin), uart);
772         if (uart->rts_pin >= 0)
773                 gpio_free(uart->rts_pin);
774 #endif
775 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
776         if (uart->cts_pin >= 0)
777                 free_irq(uart->status_irq, uart);
778 #endif
779 }
780 
781 static void
782 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
783                    struct ktermios *old)
784 {
785         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
786         unsigned long flags;
787         unsigned int baud, quot;
788         unsigned int ier, lcr = 0;
789         unsigned long timeout;
790 
791 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
792         if (old == NULL && uart->cts_pin != -1)
793                 termios->c_cflag |= CRTSCTS;
794         else if (uart->cts_pin == -1)
795                 termios->c_cflag &= ~CRTSCTS;
796 #endif
797 
798         switch (termios->c_cflag & CSIZE) {
799         case CS8:
800                 lcr = WLS(8);
801                 break;
802         case CS7:
803                 lcr = WLS(7);
804                 break;
805         case CS6:
806                 lcr = WLS(6);
807                 break;
808         case CS5:
809                 lcr = WLS(5);
810                 break;
811         default:
812                 printk(KERN_ERR "%s: word length not supported\n",
813                         __func__);
814         }
815 
816         /* Anomaly notes:
817          *  05000231 -  STOP bit is always set to 1 whatever the user is set.
818          */
819         if (termios->c_cflag & CSTOPB) {
820                 if (ANOMALY_05000231)
821                         printk(KERN_WARNING "STOP bits other than 1 is not "
822                                 "supported in case of anomaly 05000231.\n");
823                 else
824                         lcr |= STB;
825         }
826         if (termios->c_cflag & PARENB)
827                 lcr |= PEN;
828         if (!(termios->c_cflag & PARODD))
829                 lcr |= EPS;
830         if (termios->c_cflag & CMSPAR)
831                 lcr |= STP;
832 
833         spin_lock_irqsave(&uart->port.lock, flags);
834 
835         port->read_status_mask = OE;
836         if (termios->c_iflag & INPCK)
837                 port->read_status_mask |= (FE | PE);
838         if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
839                 port->read_status_mask |= BI;
840 
841         /*
842          * Characters to ignore
843          */
844         port->ignore_status_mask = 0;
845         if (termios->c_iflag & IGNPAR)
846                 port->ignore_status_mask |= FE | PE;
847         if (termios->c_iflag & IGNBRK) {
848                 port->ignore_status_mask |= BI;
849                 /*
850                  * If we're ignoring parity and break indicators,
851                  * ignore overruns too (for real raw support).
852                  */
853                 if (termios->c_iflag & IGNPAR)
854                         port->ignore_status_mask |= OE;
855         }
856 
857         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
858         quot = uart_get_divisor(port, baud);
859 
860         /* If discipline is not IRDA, apply ANOMALY_05000230 */
861         if (termios->c_line != N_IRDA)
862                 quot -= ANOMALY_05000230;
863 
864         UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
865 
866         /* Wait till the transfer buffer is empty */
867         timeout = jiffies + msecs_to_jiffies(10);
868         while (UART_GET_GCTL(uart) & UCEN && !(UART_GET_LSR(uart) & TEMT))
869                 if (time_after(jiffies, timeout)) {
870                         dev_warn(port->dev, "timeout waiting for TX buffer empty\n");
871                         break;
872                 }
873 
874         /* Disable UART */
875         ier = UART_GET_IER(uart);
876         UART_PUT_GCTL(uart, UART_GET_GCTL(uart) & ~UCEN);
877         UART_DISABLE_INTS(uart);
878 
879         /* Set DLAB in LCR to Access CLK */
880         UART_SET_DLAB(uart);
881 
882         UART_PUT_CLK(uart, quot);
883         SSYNC();
884 
885         /* Clear DLAB in LCR to Access THR RBR IER */
886         UART_CLEAR_DLAB(uart);
887 
888         UART_PUT_LCR(uart, (UART_GET_LCR(uart) & ~LCR_MASK) | lcr);
889 
890         /* Enable UART */
891         UART_ENABLE_INTS(uart, ier);
892         UART_PUT_GCTL(uart, UART_GET_GCTL(uart) | UCEN);
893 
894         /* Port speed changed, update the per-port timeout. */
895         uart_update_timeout(port, termios->c_cflag, baud);
896 
897         spin_unlock_irqrestore(&uart->port.lock, flags);
898 }
899 
900 static const char *bfin_serial_type(struct uart_port *port)
901 {
902         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
903 
904         return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
905 }
906 
907 /*
908  * Release the memory region(s) being used by 'port'.
909  */
910 static void bfin_serial_release_port(struct uart_port *port)
911 {
912 }
913 
914 /*
915  * Request the memory region(s) being used by 'port'.
916  */
917 static int bfin_serial_request_port(struct uart_port *port)
918 {
919         return 0;
920 }
921 
922 /*
923  * Configure/autoconfigure the port.
924  */
925 static void bfin_serial_config_port(struct uart_port *port, int flags)
926 {
927         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
928 
929         if (flags & UART_CONFIG_TYPE &&
930             bfin_serial_request_port(&uart->port) == 0)
931                 uart->port.type = PORT_BFIN;
932 }
933 
934 /*
935  * Verify the new serial_struct (for TIOCSSERIAL).
936  * The only change we allow are to the flags and type, and
937  * even then only between PORT_BFIN and PORT_UNKNOWN
938  */
939 static int
940 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
941 {
942         return 0;
943 }
944 
945 /*
946  * Enable the IrDA function if tty->ldisc.num is N_IRDA.
947  * In other cases, disable IrDA function.
948  */
949 static void bfin_serial_set_ldisc(struct uart_port *port,
950                                   struct ktermios *termios)
951 {
952         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
953         unsigned int val;
954 
955         switch (termios->c_line) {
956         case N_IRDA:
957                 val = UART_GET_GCTL(uart);
958                 val |= (UMOD_IRDA | RPOLC);
959                 UART_PUT_GCTL(uart, val);
960                 break;
961         default:
962                 val = UART_GET_GCTL(uart);
963                 val &= ~(UMOD_MASK | RPOLC);
964                 UART_PUT_GCTL(uart, val);
965         }
966 }
967 
968 static void bfin_serial_reset_irda(struct uart_port *port)
969 {
970         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
971         unsigned int val;
972 
973         val = UART_GET_GCTL(uart);
974         val &= ~(UMOD_MASK | RPOLC);
975         UART_PUT_GCTL(uart, val);
976         SSYNC();
977         val |= (UMOD_IRDA | RPOLC);
978         UART_PUT_GCTL(uart, val);
979         SSYNC();
980 }
981 
982 #ifdef CONFIG_CONSOLE_POLL
983 /* Anomaly notes:
984  *  05000099 -  Because we only use THRE in poll_put and DR in poll_get,
985  *              losing other bits of UART_LSR is not a problem here.
986  */
987 static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr)
988 {
989         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
990 
991         while (!(UART_GET_LSR(uart) & THRE))
992                 cpu_relax();
993 
994         UART_CLEAR_DLAB(uart);
995         UART_PUT_CHAR(uart, (unsigned char)chr);
996 }
997 
998 static int bfin_serial_poll_get_char(struct uart_port *port)
999 {
1000         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1001         unsigned char chr;
1002 
1003         while (!(UART_GET_LSR(uart) & DR))
1004                 cpu_relax();
1005 
1006         UART_CLEAR_DLAB(uart);
1007         chr = UART_GET_CHAR(uart);
1008 
1009         return chr;
1010 }
1011 #endif
1012 
1013 static struct uart_ops bfin_serial_pops = {
1014         .tx_empty       = bfin_serial_tx_empty,
1015         .set_mctrl      = bfin_serial_set_mctrl,
1016         .get_mctrl      = bfin_serial_get_mctrl,
1017         .stop_tx        = bfin_serial_stop_tx,
1018         .start_tx       = bfin_serial_start_tx,
1019         .stop_rx        = bfin_serial_stop_rx,
1020         .break_ctl      = bfin_serial_break_ctl,
1021         .startup        = bfin_serial_startup,
1022         .shutdown       = bfin_serial_shutdown,
1023         .set_termios    = bfin_serial_set_termios,
1024         .set_ldisc      = bfin_serial_set_ldisc,
1025         .type           = bfin_serial_type,
1026         .release_port   = bfin_serial_release_port,
1027         .request_port   = bfin_serial_request_port,
1028         .config_port    = bfin_serial_config_port,
1029         .verify_port    = bfin_serial_verify_port,
1030 #ifdef CONFIG_CONSOLE_POLL
1031         .poll_put_char  = bfin_serial_poll_put_char,
1032         .poll_get_char  = bfin_serial_poll_get_char,
1033 #endif
1034 };
1035 
1036 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
1037 /*
1038  * If the port was already initialised (eg, by a boot loader),
1039  * try to determine the current setup.
1040  */
1041 static void __init
1042 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
1043                            int *parity, int *bits)
1044 {
1045         unsigned int status;
1046 
1047         status = UART_GET_IER(uart) & (ERBFI | ETBEI);
1048         if (status == (ERBFI | ETBEI)) {
1049                 /* ok, the port was enabled */
1050                 u32 lcr, clk;
1051 
1052                 lcr = UART_GET_LCR(uart);
1053 
1054                 *parity = 'n';
1055                 if (lcr & PEN) {
1056                         if (lcr & EPS)
1057                                 *parity = 'e';
1058                         else
1059                                 *parity = 'o';
1060                 }
1061                 *bits = ((lcr & WLS_MASK) >> WLS_OFFSET) + 5;
1062 
1063                 /* Set DLAB in LCR to Access CLK */
1064                 UART_SET_DLAB(uart);
1065 
1066                 clk = UART_GET_CLK(uart);
1067 
1068                 /* Clear DLAB in LCR to Access THR RBR IER */
1069                 UART_CLEAR_DLAB(uart);
1070 
1071                 *baud = get_sclk() / (16*clk);
1072         }
1073         pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits);
1074 }
1075 
1076 static struct uart_driver bfin_serial_reg;
1077 
1078 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1079 {
1080         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1081         while (!(UART_GET_LSR(uart) & THRE))
1082                 barrier();
1083         UART_PUT_CHAR(uart, ch);
1084 }
1085 
1086 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1087                  defined (CONFIG_EARLY_PRINTK) */
1088 
1089 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1090 #define CLASS_BFIN_CONSOLE      "bfin-console"
1091 /*
1092  * Interrupts are disabled on entering
1093  */
1094 static void
1095 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1096 {
1097         struct bfin_serial_port *uart = bfin_serial_ports[co->index];
1098         unsigned long flags;
1099 
1100         spin_lock_irqsave(&uart->port.lock, flags);
1101         uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1102         spin_unlock_irqrestore(&uart->port.lock, flags);
1103 
1104 }
1105 
1106 static int __init
1107 bfin_serial_console_setup(struct console *co, char *options)
1108 {
1109         struct bfin_serial_port *uart;
1110         int baud = 57600;
1111         int bits = 8;
1112         int parity = 'n';
1113 # if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
1114         defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
1115         int flow = 'r';
1116 # else
1117         int flow = 'n';
1118 # endif
1119 
1120         /*
1121          * Check whether an invalid uart number has been specified, and
1122          * if so, search for the first available port that does have
1123          * console support.
1124          */
1125         if (co->index < 0 || co->index >= BFIN_UART_NR_PORTS)
1126                 return -ENODEV;
1127 
1128         uart = bfin_serial_ports[co->index];
1129         if (!uart)
1130                 return -ENODEV;
1131 
1132         if (options)
1133                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1134         else
1135                 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1136 
1137         return uart_set_options(&uart->port, co, baud, parity, bits, flow);
1138 }
1139 
1140 static struct console bfin_serial_console = {
1141         .name           = BFIN_SERIAL_DEV_NAME,
1142         .write          = bfin_serial_console_write,
1143         .device         = uart_console_device,
1144         .setup          = bfin_serial_console_setup,
1145         .flags          = CON_PRINTBUFFER,
1146         .index          = -1,
1147         .data           = &bfin_serial_reg,
1148 };
1149 #define BFIN_SERIAL_CONSOLE     (&bfin_serial_console)
1150 #else
1151 #define BFIN_SERIAL_CONSOLE     NULL
1152 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1153 
1154 #ifdef  CONFIG_EARLY_PRINTK
1155 static struct bfin_serial_port bfin_earlyprintk_port;
1156 #define CLASS_BFIN_EARLYPRINTK  "bfin-earlyprintk"
1157 
1158 /*
1159  * Interrupts are disabled on entering
1160  */
1161 static void
1162 bfin_earlyprintk_console_write(struct console *co, const char *s, unsigned int count)
1163 {
1164         unsigned long flags;
1165 
1166         if (bfin_earlyprintk_port.port.line != co->index)
1167                 return;
1168 
1169         spin_lock_irqsave(&bfin_earlyprintk_port.port.lock, flags);
1170         uart_console_write(&bfin_earlyprintk_port.port, s, count,
1171                 bfin_serial_console_putchar);
1172         spin_unlock_irqrestore(&bfin_earlyprintk_port.port.lock, flags);
1173 }
1174 
1175 /*
1176  * This should have a .setup or .early_setup in it, but then things get called
1177  * without the command line options, and the baud rate gets messed up - so
1178  * don't let the common infrastructure play with things. (see calls to setup
1179  * & earlysetup in ./kernel/printk.c:register_console()
1180  */
1181 static struct console bfin_early_serial_console __initdata = {
1182         .name = "early_BFuart",
1183         .write = bfin_earlyprintk_console_write,
1184         .device = uart_console_device,
1185         .flags = CON_PRINTBUFFER,
1186         .index = -1,
1187         .data  = &bfin_serial_reg,
1188 };
1189 #endif
1190 
1191 static struct uart_driver bfin_serial_reg = {
1192         .owner                  = THIS_MODULE,
1193         .driver_name            = DRIVER_NAME,
1194         .dev_name               = BFIN_SERIAL_DEV_NAME,
1195         .major                  = BFIN_SERIAL_MAJOR,
1196         .minor                  = BFIN_SERIAL_MINOR,
1197         .nr                     = BFIN_UART_NR_PORTS,
1198         .cons                   = BFIN_SERIAL_CONSOLE,
1199 };
1200 
1201 static int bfin_serial_suspend(struct platform_device *pdev, pm_message_t state)
1202 {
1203         struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1204 
1205         return uart_suspend_port(&bfin_serial_reg, &uart->port);
1206 }
1207 
1208 static int bfin_serial_resume(struct platform_device *pdev)
1209 {
1210         struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1211 
1212         return uart_resume_port(&bfin_serial_reg, &uart->port);
1213 }
1214 
1215 static int bfin_serial_probe(struct platform_device *pdev)
1216 {
1217         struct resource *res;
1218         struct bfin_serial_port *uart = NULL;
1219         int ret = 0;
1220 
1221         if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
1222                 dev_err(&pdev->dev, "Wrong bfin uart platform device id.\n");
1223                 return -ENOENT;
1224         }
1225 
1226         if (bfin_serial_ports[pdev->id] == NULL) {
1227 
1228                 uart = kzalloc(sizeof(*uart), GFP_KERNEL);
1229                 if (!uart) {
1230                         dev_err(&pdev->dev,
1231                                 "fail to malloc bfin_serial_port\n");
1232                         return -ENOMEM;
1233                 }
1234                 bfin_serial_ports[pdev->id] = uart;
1235 
1236 #ifdef CONFIG_EARLY_PRINTK
1237                 if (!(bfin_earlyprintk_port.port.membase
1238                         && bfin_earlyprintk_port.port.line == pdev->id)) {
1239                         /*
1240                          * If the peripheral PINs of current port is allocated
1241                          * in earlyprintk probe stage, don't do it again.
1242                          */
1243 #endif
1244                 ret = peripheral_request_list(
1245                         dev_get_platdata(&pdev->dev),
1246                         DRIVER_NAME);
1247                 if (ret) {
1248                         dev_err(&pdev->dev,
1249                                 "fail to request bfin serial peripherals\n");
1250                         goto out_error_free_mem;
1251                 }
1252 #ifdef CONFIG_EARLY_PRINTK
1253                 }
1254 #endif
1255 
1256                 spin_lock_init(&uart->port.lock);
1257                 uart->port.uartclk   = get_sclk();
1258                 uart->port.fifosize  = BFIN_UART_TX_FIFO_SIZE;
1259                 uart->port.ops       = &bfin_serial_pops;
1260                 uart->port.line      = pdev->id;
1261                 uart->port.iotype    = UPIO_MEM;
1262                 uart->port.flags     = UPF_BOOT_AUTOCONF;
1263 
1264                 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1265                 if (res == NULL) {
1266                         dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
1267                         ret = -ENOENT;
1268                         goto out_error_free_peripherals;
1269                 }
1270 
1271                 uart->port.membase = ioremap(res->start, resource_size(res));
1272                 if (!uart->port.membase) {
1273                         dev_err(&pdev->dev, "Cannot map uart IO\n");
1274                         ret = -ENXIO;
1275                         goto out_error_free_peripherals;
1276                 }
1277                 uart->port.mapbase = res->start;
1278 
1279                 uart->tx_irq = platform_get_irq(pdev, 0);
1280                 if (uart->tx_irq < 0) {
1281                         dev_err(&pdev->dev, "No uart TX IRQ specified\n");
1282                         ret = -ENOENT;
1283                         goto out_error_unmap;
1284                 }
1285 
1286                 uart->rx_irq = platform_get_irq(pdev, 1);
1287                 if (uart->rx_irq < 0) {
1288                         dev_err(&pdev->dev, "No uart RX IRQ specified\n");
1289                         ret = -ENOENT;
1290                         goto out_error_unmap;
1291                 }
1292                 uart->port.irq = uart->rx_irq;
1293 
1294                 uart->status_irq = platform_get_irq(pdev, 2);
1295                 if (uart->status_irq < 0) {
1296                         dev_err(&pdev->dev, "No uart status IRQ specified\n");
1297                         ret = -ENOENT;
1298                         goto out_error_unmap;
1299                 }
1300 
1301 #ifdef CONFIG_SERIAL_BFIN_DMA
1302                 spin_lock_init(&uart->rx_lock);
1303                 uart->tx_done       = 1;
1304                 uart->tx_count      = 0;
1305 
1306                 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
1307                 if (res == NULL) {
1308                         dev_err(&pdev->dev, "No uart TX DMA channel specified\n");
1309                         ret = -ENOENT;
1310                         goto out_error_unmap;
1311                 }
1312                 uart->tx_dma_channel = res->start;
1313 
1314                 res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
1315                 if (res == NULL) {
1316                         dev_err(&pdev->dev, "No uart RX DMA channel specified\n");
1317                         ret = -ENOENT;
1318                         goto out_error_unmap;
1319                 }
1320                 uart->rx_dma_channel = res->start;
1321 
1322                 init_timer(&(uart->rx_dma_timer));
1323 #endif
1324 
1325 #if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
1326         defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
1327                 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
1328                 if (res == NULL)
1329                         uart->cts_pin = -1;
1330                 else
1331                         uart->cts_pin = res->start;
1332 
1333                 res = platform_get_resource(pdev, IORESOURCE_IO, 1);
1334                 if (res == NULL)
1335                         uart->rts_pin = -1;
1336                 else
1337                         uart->rts_pin = res->start;
1338 #endif
1339         }
1340 
1341 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1342         if (!is_early_platform_device(pdev)) {
1343 #endif
1344                 uart = bfin_serial_ports[pdev->id];
1345                 uart->port.dev = &pdev->dev;
1346                 dev_set_drvdata(&pdev->dev, uart);
1347                 ret = uart_add_one_port(&bfin_serial_reg, &uart->port);
1348 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1349         }
1350 #endif
1351 
1352         if (!ret)
1353                 return 0;
1354 
1355         if (uart) {
1356 out_error_unmap:
1357                 iounmap(uart->port.membase);
1358 out_error_free_peripherals:
1359                 peripheral_free_list(dev_get_platdata(&pdev->dev));
1360 out_error_free_mem:
1361                 kfree(uart);
1362                 bfin_serial_ports[pdev->id] = NULL;
1363         }
1364 
1365         return ret;
1366 }
1367 
1368 static int bfin_serial_remove(struct platform_device *pdev)
1369 {
1370         struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1371 
1372         dev_set_drvdata(&pdev->dev, NULL);
1373 
1374         if (uart) {
1375                 uart_remove_one_port(&bfin_serial_reg, &uart->port);
1376                 iounmap(uart->port.membase);
1377                 peripheral_free_list(dev_get_platdata(&pdev->dev));
1378                 kfree(uart);
1379                 bfin_serial_ports[pdev->id] = NULL;
1380         }
1381 
1382         return 0;
1383 }
1384 
1385 static struct platform_driver bfin_serial_driver = {
1386         .probe          = bfin_serial_probe,
1387         .remove         = bfin_serial_remove,
1388         .suspend        = bfin_serial_suspend,
1389         .resume         = bfin_serial_resume,
1390         .driver         = {
1391                 .name   = DRIVER_NAME,
1392         },
1393 };
1394 
1395 #if defined(CONFIG_SERIAL_BFIN_CONSOLE)
1396 static struct early_platform_driver early_bfin_serial_driver __initdata = {
1397         .class_str = CLASS_BFIN_CONSOLE,
1398         .pdrv = &bfin_serial_driver,
1399         .requested_id = EARLY_PLATFORM_ID_UNSET,
1400 };
1401 
1402 static int __init bfin_serial_rs_console_init(void)
1403 {
1404         early_platform_driver_register(&early_bfin_serial_driver, DRIVER_NAME);
1405 
1406         early_platform_driver_probe(CLASS_BFIN_CONSOLE, BFIN_UART_NR_PORTS, 0);
1407 
1408         register_console(&bfin_serial_console);
1409 
1410         return 0;
1411 }
1412 console_initcall(bfin_serial_rs_console_init);
1413 #endif
1414 
1415 #ifdef CONFIG_EARLY_PRINTK
1416 /*
1417  * Memory can't be allocated dynamically during earlyprink init stage.
1418  * So, do individual probe for earlyprink with a static uart port variable.
1419  */
1420 static int bfin_earlyprintk_probe(struct platform_device *pdev)
1421 {
1422         struct resource *res;
1423         int ret;
1424 
1425         if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
1426                 dev_err(&pdev->dev, "Wrong earlyprintk platform device id.\n");
1427                 return -ENOENT;
1428         }
1429 
1430         ret = peripheral_request_list(dev_get_platdata(&pdev->dev),
1431                                         DRIVER_NAME);
1432         if (ret) {
1433                 dev_err(&pdev->dev,
1434                                 "fail to request bfin serial peripherals\n");
1435                         return ret;
1436         }
1437 
1438         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1439         if (res == NULL) {
1440                 dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
1441                 ret = -ENOENT;
1442                 goto out_error_free_peripherals;
1443         }
1444 
1445         bfin_earlyprintk_port.port.membase = ioremap(res->start,
1446                                                      resource_size(res));
1447         if (!bfin_earlyprintk_port.port.membase) {
1448                 dev_err(&pdev->dev, "Cannot map uart IO\n");
1449                 ret = -ENXIO;
1450                 goto out_error_free_peripherals;
1451         }
1452         bfin_earlyprintk_port.port.mapbase = res->start;
1453         bfin_earlyprintk_port.port.line = pdev->id;
1454         bfin_earlyprintk_port.port.uartclk = get_sclk();
1455         bfin_earlyprintk_port.port.fifosize  = BFIN_UART_TX_FIFO_SIZE;
1456         spin_lock_init(&bfin_earlyprintk_port.port.lock);
1457 
1458         return 0;
1459 
1460 out_error_free_peripherals:
1461         peripheral_free_list(dev_get_platdata(&pdev->dev));
1462 
1463         return ret;
1464 }
1465 
1466 static struct platform_driver bfin_earlyprintk_driver = {
1467         .probe          = bfin_earlyprintk_probe,
1468         .driver         = {
1469                 .name   = DRIVER_NAME,
1470                 .owner  = THIS_MODULE,
1471         },
1472 };
1473 
1474 static struct early_platform_driver early_bfin_earlyprintk_driver __initdata = {
1475         .class_str = CLASS_BFIN_EARLYPRINTK,
1476         .pdrv = &bfin_earlyprintk_driver,
1477         .requested_id = EARLY_PLATFORM_ID_UNSET,
1478 };
1479 
1480 struct console __init *bfin_earlyserial_init(unsigned int port,
1481                                                 unsigned int cflag)
1482 {
1483         struct ktermios t;
1484         char port_name[20];
1485 
1486         if (port < 0 || port >= BFIN_UART_NR_PORTS)
1487                 return NULL;
1488 
1489         /*
1490          * Only probe resource of the given port in earlyprintk boot arg.
1491          * The expected port id should be indicated in port name string.
1492          */
1493         snprintf(port_name, 20, DRIVER_NAME ".%d", port);
1494         early_platform_driver_register(&early_bfin_earlyprintk_driver,
1495                 port_name);
1496         early_platform_driver_probe(CLASS_BFIN_EARLYPRINTK, 1, 0);
1497 
1498         if (!bfin_earlyprintk_port.port.membase)
1499                 return NULL;
1500 
1501 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1502         /*
1503          * If we are using early serial, don't let the normal console rewind
1504          * log buffer, since that causes things to be printed multiple times
1505          */
1506         bfin_serial_console.flags &= ~CON_PRINTBUFFER;
1507 #endif
1508 
1509         bfin_early_serial_console.index = port;
1510         t.c_cflag = cflag;
1511         t.c_iflag = 0;
1512         t.c_oflag = 0;
1513         t.c_lflag = ICANON;
1514         t.c_line = port;
1515         bfin_serial_set_termios(&bfin_earlyprintk_port.port, &t, &t);
1516 
1517         return &bfin_early_serial_console;
1518 }
1519 #endif /* CONFIG_EARLY_PRINTK */
1520 
1521 static int __init bfin_serial_init(void)
1522 {
1523         int ret;
1524 
1525         pr_info("Blackfin serial driver\n");
1526 
1527         ret = uart_register_driver(&bfin_serial_reg);
1528         if (ret) {
1529                 pr_err("failed to register %s:%d\n",
1530                         bfin_serial_reg.driver_name, ret);
1531         }
1532 
1533         ret = platform_driver_register(&bfin_serial_driver);
1534         if (ret) {
1535                 pr_err("fail to register bfin uart\n");
1536                 uart_unregister_driver(&bfin_serial_reg);
1537         }
1538 
1539         return ret;
1540 }
1541 
1542 static void __exit bfin_serial_exit(void)
1543 {
1544         platform_driver_unregister(&bfin_serial_driver);
1545         uart_unregister_driver(&bfin_serial_reg);
1546 }
1547 
1548 
1549 module_init(bfin_serial_init);
1550 module_exit(bfin_serial_exit);
1551 
1552 MODULE_AUTHOR("Sonic Zhang, Aubrey Li");
1553 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1554 MODULE_LICENSE("GPL");
1555 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);
1556 MODULE_ALIAS("platform:bfin-uart");
1557 

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