]>
Commit | Line | Data |
---|---|---|
194de561 BW |
1 | /* |
2 | * File: drivers/serial/bfin_5xx.c | |
3 | * Based on: Based on drivers/serial/sa1100.c | |
4 | * Author: Aubrey Li <aubrey.li@analog.com> | |
5 | * | |
6 | * Created: | |
7 | * Description: Driver for blackfin 5xx serial ports | |
8 | * | |
194de561 BW |
9 | * Modified: |
10 | * Copyright 2006 Analog Devices Inc. | |
11 | * | |
12 | * Bugs: Enter bugs at http://blackfin.uclinux.org/ | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2 of the License, or | |
17 | * (at your option) any later version. | |
18 | * | |
19 | * This program is distributed in the hope that it will be useful, | |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | * GNU General Public License for more details. | |
23 | * | |
24 | * You should have received a copy of the GNU General Public License | |
25 | * along with this program; if not, see the file COPYING, or write | |
26 | * to the Free Software Foundation, Inc., | |
27 | * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
28 | */ | |
29 | ||
30 | #if defined(CONFIG_SERIAL_BFIN_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) | |
31 | #define SUPPORT_SYSRQ | |
32 | #endif | |
33 | ||
34 | #include <linux/module.h> | |
35 | #include <linux/ioport.h> | |
36 | #include <linux/init.h> | |
37 | #include <linux/console.h> | |
38 | #include <linux/sysrq.h> | |
39 | #include <linux/platform_device.h> | |
40 | #include <linux/tty.h> | |
41 | #include <linux/tty_flip.h> | |
42 | #include <linux/serial_core.h> | |
43 | ||
44 | #include <asm/gpio.h> | |
45 | #include <asm/mach/bfin_serial_5xx.h> | |
46 | ||
47 | #ifdef CONFIG_SERIAL_BFIN_DMA | |
48 | #include <linux/dma-mapping.h> | |
49 | #include <asm/io.h> | |
50 | #include <asm/irq.h> | |
51 | #include <asm/cacheflush.h> | |
52 | #endif | |
53 | ||
54 | /* UART name and device definitions */ | |
55 | #define BFIN_SERIAL_NAME "ttyBF" | |
56 | #define BFIN_SERIAL_MAJOR 204 | |
57 | #define BFIN_SERIAL_MINOR 64 | |
58 | ||
59 | /* | |
60 | * Setup for console. Argument comes from the menuconfig | |
61 | */ | |
62 | #define DMA_RX_XCOUNT 512 | |
63 | #define DMA_RX_YCOUNT (PAGE_SIZE / DMA_RX_XCOUNT) | |
64 | ||
65 | #define DMA_RX_FLUSH_JIFFIES 5 | |
66 | ||
67 | #ifdef CONFIG_SERIAL_BFIN_DMA | |
68 | static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart); | |
69 | #else | |
70 | static void bfin_serial_do_work(struct work_struct *work); | |
71 | static void bfin_serial_tx_chars(struct bfin_serial_port *uart); | |
72 | static void local_put_char(struct bfin_serial_port *uart, char ch); | |
73 | #endif | |
74 | ||
75 | static void bfin_serial_mctrl_check(struct bfin_serial_port *uart); | |
76 | ||
77 | /* | |
78 | * interrupts are disabled on entry | |
79 | */ | |
80 | static void bfin_serial_stop_tx(struct uart_port *port) | |
81 | { | |
82 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
83 | ||
84 | #ifdef CONFIG_SERIAL_BFIN_DMA | |
85 | disable_dma(uart->tx_dma_channel); | |
86 | #else | |
87 | unsigned short ier; | |
88 | ||
89 | ier = UART_GET_IER(uart); | |
90 | ier &= ~ETBEI; | |
91 | UART_PUT_IER(uart, ier); | |
92 | #endif | |
93 | } | |
94 | ||
95 | /* | |
96 | * port is locked and interrupts are disabled | |
97 | */ | |
98 | static void bfin_serial_start_tx(struct uart_port *port) | |
99 | { | |
100 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
101 | ||
102 | #ifdef CONFIG_SERIAL_BFIN_DMA | |
103 | bfin_serial_dma_tx_chars(uart); | |
104 | #else | |
105 | unsigned short ier; | |
106 | ier = UART_GET_IER(uart); | |
107 | ier |= ETBEI; | |
108 | UART_PUT_IER(uart, ier); | |
109 | bfin_serial_tx_chars(uart); | |
110 | #endif | |
111 | } | |
112 | ||
113 | /* | |
114 | * Interrupts are enabled | |
115 | */ | |
116 | static void bfin_serial_stop_rx(struct uart_port *port) | |
117 | { | |
118 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
119 | unsigned short ier; | |
120 | ||
121 | ier = UART_GET_IER(uart); | |
122 | ier &= ~ERBFI; | |
123 | UART_PUT_IER(uart, ier); | |
124 | } | |
125 | ||
126 | /* | |
127 | * Set the modem control timer to fire immediately. | |
128 | */ | |
129 | static void bfin_serial_enable_ms(struct uart_port *port) | |
130 | { | |
131 | } | |
132 | ||
133 | #ifdef CONFIG_SERIAL_BFIN_PIO | |
134 | static void local_put_char(struct bfin_serial_port *uart, char ch) | |
135 | { | |
136 | unsigned short status; | |
137 | int flags = 0; | |
138 | ||
139 | spin_lock_irqsave(&uart->port.lock, flags); | |
140 | ||
141 | do { | |
142 | status = UART_GET_LSR(uart); | |
143 | } while (!(status & THRE)); | |
144 | ||
145 | UART_PUT_CHAR(uart, ch); | |
146 | SSYNC(); | |
147 | ||
148 | spin_unlock_irqrestore(&uart->port.lock, flags); | |
149 | } | |
150 | ||
151 | static void bfin_serial_rx_chars(struct bfin_serial_port *uart) | |
152 | { | |
2ac5ee47 | 153 | struct tty_struct *tty = uart->port.info->tty; |
194de561 BW |
154 | unsigned int status, ch, flg; |
155 | #ifdef BF533_FAMILY | |
156 | static int in_break = 0; | |
157 | #endif | |
158 | ||
159 | status = UART_GET_LSR(uart); | |
160 | ch = UART_GET_CHAR(uart); | |
161 | uart->port.icount.rx++; | |
162 | ||
163 | #ifdef BF533_FAMILY | |
164 | /* The BF533 family of processors have a nice misbehavior where | |
165 | * they continuously generate characters for a "single" break. | |
166 | * We have to basically ignore this flood until the "next" valid | |
167 | * character comes across. All other Blackfin families operate | |
168 | * properly though. | |
169 | */ | |
170 | if (in_break) { | |
171 | if (ch != 0) { | |
172 | in_break = 0; | |
173 | ch = UART_GET_CHAR(uart); | |
2ac5ee47 MF |
174 | if (bfin_revid() < 5) |
175 | return; | |
176 | } else | |
177 | return; | |
194de561 BW |
178 | } |
179 | #endif | |
180 | ||
181 | if (status & BI) { | |
182 | #ifdef BF533_FAMILY | |
183 | in_break = 1; | |
184 | #endif | |
185 | uart->port.icount.brk++; | |
186 | if (uart_handle_break(&uart->port)) | |
187 | goto ignore_char; | |
2ac5ee47 MF |
188 | } |
189 | if (status & PE) | |
194de561 | 190 | uart->port.icount.parity++; |
2ac5ee47 | 191 | if (status & OE) |
194de561 | 192 | uart->port.icount.overrun++; |
2ac5ee47 | 193 | if (status & FE) |
194de561 | 194 | uart->port.icount.frame++; |
2ac5ee47 MF |
195 | |
196 | status &= uart->port.read_status_mask; | |
197 | ||
198 | if (status & BI) | |
199 | flg = TTY_BREAK; | |
200 | else if (status & PE) | |
201 | flg = TTY_PARITY; | |
202 | else if (status & FE) | |
203 | flg = TTY_FRAME; | |
204 | else | |
194de561 BW |
205 | flg = TTY_NORMAL; |
206 | ||
207 | if (uart_handle_sysrq_char(&uart->port, ch)) | |
208 | goto ignore_char; | |
194de561 | 209 | |
2ac5ee47 MF |
210 | uart_insert_char(&uart->port, status, OE, ch, flg); |
211 | ||
212 | ignore_char: | |
213 | tty_flip_buffer_push(tty); | |
194de561 BW |
214 | } |
215 | ||
216 | static void bfin_serial_tx_chars(struct bfin_serial_port *uart) | |
217 | { | |
218 | struct circ_buf *xmit = &uart->port.info->xmit; | |
219 | ||
220 | if (uart->port.x_char) { | |
221 | UART_PUT_CHAR(uart, uart->port.x_char); | |
222 | uart->port.icount.tx++; | |
223 | uart->port.x_char = 0; | |
224 | return; | |
225 | } | |
226 | /* | |
227 | * Check the modem control lines before | |
228 | * transmitting anything. | |
229 | */ | |
230 | bfin_serial_mctrl_check(uart); | |
231 | ||
232 | if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) { | |
233 | bfin_serial_stop_tx(&uart->port); | |
234 | return; | |
235 | } | |
236 | ||
237 | local_put_char(uart, xmit->buf[xmit->tail]); | |
238 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
239 | uart->port.icount.tx++; | |
240 | ||
241 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
242 | uart_write_wakeup(&uart->port); | |
243 | ||
244 | if (uart_circ_empty(xmit)) | |
245 | bfin_serial_stop_tx(&uart->port); | |
246 | } | |
247 | ||
5c4e472b AL |
248 | static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id) |
249 | { | |
250 | struct bfin_serial_port *uart = dev_id; | |
251 | ||
252 | spin_lock(&uart->port.lock); | |
253 | while ((UART_GET_IIR(uart) & IIR_STATUS) == IIR_RX_READY) | |
254 | bfin_serial_rx_chars(uart); | |
255 | spin_unlock(&uart->port.lock); | |
256 | return IRQ_HANDLED; | |
257 | } | |
258 | ||
259 | static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id) | |
194de561 BW |
260 | { |
261 | struct bfin_serial_port *uart = dev_id; | |
194de561 BW |
262 | |
263 | spin_lock(&uart->port.lock); | |
5c4e472b AL |
264 | while ((UART_GET_IIR(uart) & IIR_STATUS) == IIR_TX_READY) |
265 | bfin_serial_tx_chars(uart); | |
194de561 BW |
266 | spin_unlock(&uart->port.lock); |
267 | return IRQ_HANDLED; | |
268 | } | |
269 | ||
5c4e472b | 270 | |
194de561 BW |
271 | static void bfin_serial_do_work(struct work_struct *work) |
272 | { | |
273 | struct bfin_serial_port *uart = container_of(work, struct bfin_serial_port, cts_workqueue); | |
274 | ||
275 | bfin_serial_mctrl_check(uart); | |
276 | } | |
277 | ||
278 | #endif | |
279 | ||
280 | #ifdef CONFIG_SERIAL_BFIN_DMA | |
281 | static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart) | |
282 | { | |
283 | struct circ_buf *xmit = &uart->port.info->xmit; | |
284 | unsigned short ier; | |
285 | int flags = 0; | |
286 | ||
287 | if (!uart->tx_done) | |
288 | return; | |
289 | ||
290 | uart->tx_done = 0; | |
291 | ||
292 | if (uart->port.x_char) { | |
293 | UART_PUT_CHAR(uart, uart->port.x_char); | |
294 | uart->port.icount.tx++; | |
295 | uart->port.x_char = 0; | |
296 | uart->tx_done = 1; | |
297 | return; | |
298 | } | |
299 | /* | |
300 | * Check the modem control lines before | |
301 | * transmitting anything. | |
302 | */ | |
303 | bfin_serial_mctrl_check(uart); | |
304 | ||
305 | if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) { | |
306 | bfin_serial_stop_tx(&uart->port); | |
307 | uart->tx_done = 1; | |
308 | return; | |
309 | } | |
310 | ||
311 | spin_lock_irqsave(&uart->port.lock, flags); | |
312 | uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE); | |
313 | if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail)) | |
314 | uart->tx_count = UART_XMIT_SIZE - xmit->tail; | |
315 | blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail), | |
316 | (unsigned long)(xmit->buf+xmit->tail+uart->tx_count)); | |
317 | set_dma_config(uart->tx_dma_channel, | |
318 | set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP, | |
319 | INTR_ON_BUF, | |
320 | DIMENSION_LINEAR, | |
321 | DATA_SIZE_8)); | |
322 | set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail)); | |
323 | set_dma_x_count(uart->tx_dma_channel, uart->tx_count); | |
324 | set_dma_x_modify(uart->tx_dma_channel, 1); | |
325 | enable_dma(uart->tx_dma_channel); | |
326 | ier = UART_GET_IER(uart); | |
327 | ier |= ETBEI; | |
328 | UART_PUT_IER(uart, ier); | |
329 | spin_unlock_irqrestore(&uart->port.lock, flags); | |
330 | } | |
331 | ||
2ac5ee47 | 332 | static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart) |
194de561 BW |
333 | { |
334 | struct tty_struct *tty = uart->port.info->tty; | |
335 | int i, flg, status; | |
336 | ||
337 | status = UART_GET_LSR(uart); | |
338 | uart->port.icount.rx += CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail, UART_XMIT_SIZE);; | |
339 | ||
340 | if (status & BI) { | |
341 | uart->port.icount.brk++; | |
342 | if (uart_handle_break(&uart->port)) | |
343 | goto dma_ignore_char; | |
2ac5ee47 MF |
344 | } |
345 | if (status & PE) | |
194de561 | 346 | uart->port.icount.parity++; |
2ac5ee47 | 347 | if (status & OE) |
194de561 | 348 | uart->port.icount.overrun++; |
2ac5ee47 | 349 | if (status & FE) |
194de561 | 350 | uart->port.icount.frame++; |
2ac5ee47 MF |
351 | |
352 | status &= uart->port.read_status_mask; | |
353 | ||
354 | if (status & BI) | |
355 | flg = TTY_BREAK; | |
356 | else if (status & PE) | |
357 | flg = TTY_PARITY; | |
358 | else if (status & FE) | |
359 | flg = TTY_FRAME; | |
360 | else | |
194de561 BW |
361 | flg = TTY_NORMAL; |
362 | ||
363 | for (i = uart->rx_dma_buf.head; i < uart->rx_dma_buf.tail; i++) { | |
364 | if (uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i])) | |
365 | goto dma_ignore_char; | |
2ac5ee47 | 366 | uart_insert_char(&uart->port, status, OE, uart->rx_dma_buf.buf[i], flg); |
194de561 | 367 | } |
2ac5ee47 MF |
368 | |
369 | dma_ignore_char: | |
194de561 BW |
370 | tty_flip_buffer_push(tty); |
371 | } | |
372 | ||
373 | void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart) | |
374 | { | |
375 | int x_pos, pos; | |
376 | int flags = 0; | |
377 | ||
378 | bfin_serial_dma_tx_chars(uart); | |
379 | ||
380 | spin_lock_irqsave(&uart->port.lock, flags); | |
381 | x_pos = DMA_RX_XCOUNT - get_dma_curr_xcount(uart->rx_dma_channel); | |
382 | if (x_pos == DMA_RX_XCOUNT) | |
383 | x_pos = 0; | |
384 | ||
385 | pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos; | |
386 | ||
387 | if (pos>uart->rx_dma_buf.tail) { | |
388 | uart->rx_dma_buf.tail = pos; | |
389 | bfin_serial_dma_rx_chars(uart); | |
390 | uart->rx_dma_buf.head = uart->rx_dma_buf.tail; | |
391 | } | |
392 | spin_unlock_irqrestore(&uart->port.lock, flags); | |
393 | uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES; | |
394 | add_timer(&(uart->rx_dma_timer)); | |
395 | } | |
396 | ||
397 | static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id) | |
398 | { | |
399 | struct bfin_serial_port *uart = dev_id; | |
400 | struct circ_buf *xmit = &uart->port.info->xmit; | |
401 | unsigned short ier; | |
402 | ||
403 | spin_lock(&uart->port.lock); | |
404 | if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) { | |
405 | clear_dma_irqstat(uart->tx_dma_channel); | |
406 | disable_dma(uart->tx_dma_channel); | |
407 | ier = UART_GET_IER(uart); | |
408 | ier &= ~ETBEI; | |
409 | UART_PUT_IER(uart, ier); | |
410 | xmit->tail = (xmit->tail+uart->tx_count) &(UART_XMIT_SIZE -1); | |
411 | uart->port.icount.tx+=uart->tx_count; | |
412 | ||
413 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
414 | uart_write_wakeup(&uart->port); | |
415 | ||
416 | if (uart_circ_empty(xmit)) | |
417 | bfin_serial_stop_tx(&uart->port); | |
418 | uart->tx_done = 1; | |
419 | } | |
420 | ||
421 | spin_unlock(&uart->port.lock); | |
422 | return IRQ_HANDLED; | |
423 | } | |
424 | ||
425 | static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id) | |
426 | { | |
427 | struct bfin_serial_port *uart = dev_id; | |
428 | unsigned short irqstat; | |
429 | ||
430 | uart->rx_dma_nrows++; | |
431 | if (uart->rx_dma_nrows == DMA_RX_YCOUNT) { | |
432 | uart->rx_dma_nrows = 0; | |
433 | uart->rx_dma_buf.tail = DMA_RX_XCOUNT*DMA_RX_YCOUNT; | |
434 | bfin_serial_dma_rx_chars(uart); | |
435 | uart->rx_dma_buf.head = uart->rx_dma_buf.tail = 0; | |
436 | } | |
437 | spin_lock(&uart->port.lock); | |
438 | irqstat = get_dma_curr_irqstat(uart->rx_dma_channel); | |
439 | clear_dma_irqstat(uart->rx_dma_channel); | |
440 | ||
441 | spin_unlock(&uart->port.lock); | |
442 | return IRQ_HANDLED; | |
443 | } | |
444 | #endif | |
445 | ||
446 | /* | |
447 | * Return TIOCSER_TEMT when transmitter is not busy. | |
448 | */ | |
449 | static unsigned int bfin_serial_tx_empty(struct uart_port *port) | |
450 | { | |
451 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
452 | unsigned short lsr; | |
453 | ||
454 | lsr = UART_GET_LSR(uart); | |
455 | if (lsr & TEMT) | |
456 | return TIOCSER_TEMT; | |
457 | else | |
458 | return 0; | |
459 | } | |
460 | ||
461 | static unsigned int bfin_serial_get_mctrl(struct uart_port *port) | |
462 | { | |
463 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS | |
464 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
465 | if (uart->cts_pin < 0) | |
466 | return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; | |
467 | ||
468 | if (gpio_get_value(uart->cts_pin)) | |
469 | return TIOCM_DSR | TIOCM_CAR; | |
470 | else | |
471 | #endif | |
472 | return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; | |
473 | } | |
474 | ||
475 | static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
476 | { | |
477 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS | |
478 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
479 | if (uart->rts_pin < 0) | |
480 | return; | |
481 | ||
482 | if (mctrl & TIOCM_RTS) | |
483 | gpio_set_value(uart->rts_pin, 0); | |
484 | else | |
485 | gpio_set_value(uart->rts_pin, 1); | |
486 | #endif | |
487 | } | |
488 | ||
489 | /* | |
490 | * Handle any change of modem status signal since we were last called. | |
491 | */ | |
492 | static void bfin_serial_mctrl_check(struct bfin_serial_port *uart) | |
493 | { | |
494 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS | |
495 | unsigned int status; | |
496 | # ifdef CONFIG_SERIAL_BFIN_DMA | |
497 | struct uart_info *info = uart->port.info; | |
498 | struct tty_struct *tty = info->tty; | |
499 | ||
500 | status = bfin_serial_get_mctrl(&uart->port); | |
501 | if (!(status & TIOCM_CTS)) { | |
502 | tty->hw_stopped = 1; | |
503 | } else { | |
504 | tty->hw_stopped = 0; | |
505 | } | |
506 | # else | |
507 | status = bfin_serial_get_mctrl(&uart->port); | |
508 | uart_handle_cts_change(&uart->port, status & TIOCM_CTS); | |
509 | if (!(status & TIOCM_CTS)) | |
510 | schedule_work(&uart->cts_workqueue); | |
511 | # endif | |
512 | #endif | |
513 | } | |
514 | ||
515 | /* | |
516 | * Interrupts are always disabled. | |
517 | */ | |
518 | static void bfin_serial_break_ctl(struct uart_port *port, int break_state) | |
519 | { | |
520 | } | |
521 | ||
522 | static int bfin_serial_startup(struct uart_port *port) | |
523 | { | |
524 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
525 | ||
526 | #ifdef CONFIG_SERIAL_BFIN_DMA | |
527 | dma_addr_t dma_handle; | |
528 | ||
529 | if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) { | |
530 | printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n"); | |
531 | return -EBUSY; | |
532 | } | |
533 | ||
534 | if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) { | |
535 | printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n"); | |
536 | free_dma(uart->rx_dma_channel); | |
537 | return -EBUSY; | |
538 | } | |
539 | ||
540 | set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart); | |
541 | set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart); | |
542 | ||
543 | uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA); | |
544 | uart->rx_dma_buf.head = 0; | |
545 | uart->rx_dma_buf.tail = 0; | |
546 | uart->rx_dma_nrows = 0; | |
547 | ||
548 | set_dma_config(uart->rx_dma_channel, | |
549 | set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO, | |
550 | INTR_ON_ROW, DIMENSION_2D, | |
551 | DATA_SIZE_8)); | |
552 | set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT); | |
553 | set_dma_x_modify(uart->rx_dma_channel, 1); | |
554 | set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT); | |
555 | set_dma_y_modify(uart->rx_dma_channel, 1); | |
556 | set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf); | |
557 | enable_dma(uart->rx_dma_channel); | |
558 | ||
559 | uart->rx_dma_timer.data = (unsigned long)(uart); | |
560 | uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout; | |
561 | uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES; | |
562 | add_timer(&(uart->rx_dma_timer)); | |
563 | #else | |
564 | if (request_irq | |
5c4e472b | 565 | (uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED, |
194de561 BW |
566 | "BFIN_UART_RX", uart)) { |
567 | printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n"); | |
568 | return -EBUSY; | |
569 | } | |
570 | ||
571 | if (request_irq | |
5c4e472b | 572 | (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED, |
194de561 BW |
573 | "BFIN_UART_TX", uart)) { |
574 | printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n"); | |
575 | free_irq(uart->port.irq, uart); | |
576 | return -EBUSY; | |
577 | } | |
578 | #endif | |
579 | UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI); | |
580 | return 0; | |
581 | } | |
582 | ||
583 | static void bfin_serial_shutdown(struct uart_port *port) | |
584 | { | |
585 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
586 | ||
587 | #ifdef CONFIG_SERIAL_BFIN_DMA | |
588 | disable_dma(uart->tx_dma_channel); | |
589 | free_dma(uart->tx_dma_channel); | |
590 | disable_dma(uart->rx_dma_channel); | |
591 | free_dma(uart->rx_dma_channel); | |
592 | del_timer(&(uart->rx_dma_timer)); | |
593 | #else | |
594 | free_irq(uart->port.irq, uart); | |
595 | free_irq(uart->port.irq+1, uart); | |
596 | #endif | |
597 | } | |
598 | ||
599 | static void | |
600 | bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios, | |
601 | struct ktermios *old) | |
602 | { | |
603 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
604 | unsigned long flags; | |
605 | unsigned int baud, quot; | |
606 | unsigned short val, ier, lsr, lcr = 0; | |
607 | ||
608 | switch (termios->c_cflag & CSIZE) { | |
609 | case CS8: | |
610 | lcr = WLS(8); | |
611 | break; | |
612 | case CS7: | |
613 | lcr = WLS(7); | |
614 | break; | |
615 | case CS6: | |
616 | lcr = WLS(6); | |
617 | break; | |
618 | case CS5: | |
619 | lcr = WLS(5); | |
620 | break; | |
621 | default: | |
622 | printk(KERN_ERR "%s: word lengh not supported\n", | |
623 | __FUNCTION__); | |
624 | } | |
625 | ||
626 | if (termios->c_cflag & CSTOPB) | |
627 | lcr |= STB; | |
628 | if (termios->c_cflag & PARENB) { | |
629 | lcr |= PEN; | |
630 | if (!(termios->c_cflag & PARODD)) | |
631 | lcr |= EPS; | |
c16c3ca7 MF |
632 | if (termios->c_cflag & CMSPAR) |
633 | lcr |= STP; | |
194de561 BW |
634 | } |
635 | ||
2ac5ee47 MF |
636 | port->read_status_mask = OE; |
637 | if (termios->c_iflag & INPCK) | |
638 | port->read_status_mask |= (FE | PE); | |
639 | if (termios->c_iflag & (BRKINT | PARMRK)) | |
640 | port->read_status_mask |= BI; | |
194de561 | 641 | |
2ac5ee47 MF |
642 | /* |
643 | * Characters to ignore | |
644 | */ | |
645 | port->ignore_status_mask = 0; | |
646 | if (termios->c_iflag & IGNPAR) | |
647 | port->ignore_status_mask |= FE | PE; | |
648 | if (termios->c_iflag & IGNBRK) { | |
649 | port->ignore_status_mask |= BI; | |
650 | /* | |
651 | * If we're ignoring parity and break indicators, | |
652 | * ignore overruns too (for real raw support). | |
653 | */ | |
654 | if (termios->c_iflag & IGNPAR) | |
655 | port->ignore_status_mask |= OE; | |
656 | } | |
194de561 BW |
657 | |
658 | baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); | |
659 | quot = uart_get_divisor(port, baud); | |
660 | spin_lock_irqsave(&uart->port.lock, flags); | |
661 | ||
662 | do { | |
663 | lsr = UART_GET_LSR(uart); | |
664 | } while (!(lsr & TEMT)); | |
665 | ||
666 | /* Disable UART */ | |
667 | ier = UART_GET_IER(uart); | |
668 | UART_PUT_IER(uart, 0); | |
669 | ||
670 | /* Set DLAB in LCR to Access DLL and DLH */ | |
671 | val = UART_GET_LCR(uart); | |
672 | val |= DLAB; | |
673 | UART_PUT_LCR(uart, val); | |
674 | SSYNC(); | |
675 | ||
676 | UART_PUT_DLL(uart, quot & 0xFF); | |
677 | SSYNC(); | |
678 | UART_PUT_DLH(uart, (quot >> 8) & 0xFF); | |
679 | SSYNC(); | |
680 | ||
681 | /* Clear DLAB in LCR to Access THR RBR IER */ | |
682 | val = UART_GET_LCR(uart); | |
683 | val &= ~DLAB; | |
684 | UART_PUT_LCR(uart, val); | |
685 | SSYNC(); | |
686 | ||
687 | UART_PUT_LCR(uart, lcr); | |
688 | ||
689 | /* Enable UART */ | |
690 | UART_PUT_IER(uart, ier); | |
691 | ||
692 | val = UART_GET_GCTL(uart); | |
693 | val |= UCEN; | |
694 | UART_PUT_GCTL(uart, val); | |
695 | ||
696 | spin_unlock_irqrestore(&uart->port.lock, flags); | |
697 | } | |
698 | ||
699 | static const char *bfin_serial_type(struct uart_port *port) | |
700 | { | |
701 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
702 | ||
703 | return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL; | |
704 | } | |
705 | ||
706 | /* | |
707 | * Release the memory region(s) being used by 'port'. | |
708 | */ | |
709 | static void bfin_serial_release_port(struct uart_port *port) | |
710 | { | |
711 | } | |
712 | ||
713 | /* | |
714 | * Request the memory region(s) being used by 'port'. | |
715 | */ | |
716 | static int bfin_serial_request_port(struct uart_port *port) | |
717 | { | |
718 | return 0; | |
719 | } | |
720 | ||
721 | /* | |
722 | * Configure/autoconfigure the port. | |
723 | */ | |
724 | static void bfin_serial_config_port(struct uart_port *port, int flags) | |
725 | { | |
726 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
727 | ||
728 | if (flags & UART_CONFIG_TYPE && | |
729 | bfin_serial_request_port(&uart->port) == 0) | |
730 | uart->port.type = PORT_BFIN; | |
731 | } | |
732 | ||
733 | /* | |
734 | * Verify the new serial_struct (for TIOCSSERIAL). | |
735 | * The only change we allow are to the flags and type, and | |
736 | * even then only between PORT_BFIN and PORT_UNKNOWN | |
737 | */ | |
738 | static int | |
739 | bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser) | |
740 | { | |
741 | return 0; | |
742 | } | |
743 | ||
744 | static struct uart_ops bfin_serial_pops = { | |
745 | .tx_empty = bfin_serial_tx_empty, | |
746 | .set_mctrl = bfin_serial_set_mctrl, | |
747 | .get_mctrl = bfin_serial_get_mctrl, | |
748 | .stop_tx = bfin_serial_stop_tx, | |
749 | .start_tx = bfin_serial_start_tx, | |
750 | .stop_rx = bfin_serial_stop_rx, | |
751 | .enable_ms = bfin_serial_enable_ms, | |
752 | .break_ctl = bfin_serial_break_ctl, | |
753 | .startup = bfin_serial_startup, | |
754 | .shutdown = bfin_serial_shutdown, | |
755 | .set_termios = bfin_serial_set_termios, | |
756 | .type = bfin_serial_type, | |
757 | .release_port = bfin_serial_release_port, | |
758 | .request_port = bfin_serial_request_port, | |
759 | .config_port = bfin_serial_config_port, | |
760 | .verify_port = bfin_serial_verify_port, | |
761 | }; | |
762 | ||
763 | static void __init bfin_serial_init_ports(void) | |
764 | { | |
765 | static int first = 1; | |
766 | int i; | |
767 | ||
768 | if (!first) | |
769 | return; | |
770 | first = 0; | |
771 | ||
772 | for (i = 0; i < nr_ports; i++) { | |
773 | bfin_serial_ports[i].port.uartclk = get_sclk(); | |
774 | bfin_serial_ports[i].port.ops = &bfin_serial_pops; | |
775 | bfin_serial_ports[i].port.line = i; | |
776 | bfin_serial_ports[i].port.iotype = UPIO_MEM; | |
777 | bfin_serial_ports[i].port.membase = | |
778 | (void __iomem *)bfin_serial_resource[i].uart_base_addr; | |
779 | bfin_serial_ports[i].port.mapbase = | |
780 | bfin_serial_resource[i].uart_base_addr; | |
781 | bfin_serial_ports[i].port.irq = | |
782 | bfin_serial_resource[i].uart_irq; | |
783 | bfin_serial_ports[i].port.flags = UPF_BOOT_AUTOCONF; | |
784 | #ifdef CONFIG_SERIAL_BFIN_DMA | |
785 | bfin_serial_ports[i].tx_done = 1; | |
786 | bfin_serial_ports[i].tx_count = 0; | |
787 | bfin_serial_ports[i].tx_dma_channel = | |
788 | bfin_serial_resource[i].uart_tx_dma_channel; | |
789 | bfin_serial_ports[i].rx_dma_channel = | |
790 | bfin_serial_resource[i].uart_rx_dma_channel; | |
791 | init_timer(&(bfin_serial_ports[i].rx_dma_timer)); | |
792 | #else | |
793 | INIT_WORK(&bfin_serial_ports[i].cts_workqueue, bfin_serial_do_work); | |
794 | #endif | |
795 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS | |
796 | bfin_serial_ports[i].cts_pin = | |
797 | bfin_serial_resource[i].uart_cts_pin; | |
798 | bfin_serial_ports[i].rts_pin = | |
799 | bfin_serial_resource[i].uart_rts_pin; | |
800 | #endif | |
801 | bfin_serial_hw_init(&bfin_serial_ports[i]); | |
802 | ||
803 | } | |
804 | } | |
805 | ||
806 | #ifdef CONFIG_SERIAL_BFIN_CONSOLE | |
807 | static void bfin_serial_console_putchar(struct uart_port *port, int ch) | |
808 | { | |
809 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
810 | while (!(UART_GET_LSR(uart))) | |
811 | barrier(); | |
812 | UART_PUT_CHAR(uart, ch); | |
813 | SSYNC(); | |
814 | } | |
815 | ||
816 | /* | |
817 | * Interrupts are disabled on entering | |
818 | */ | |
819 | static void | |
820 | bfin_serial_console_write(struct console *co, const char *s, unsigned int count) | |
821 | { | |
822 | struct bfin_serial_port *uart = &bfin_serial_ports[co->index]; | |
823 | int flags = 0; | |
824 | ||
825 | spin_lock_irqsave(&uart->port.lock, flags); | |
826 | uart_console_write(&uart->port, s, count, bfin_serial_console_putchar); | |
827 | spin_unlock_irqrestore(&uart->port.lock, flags); | |
828 | ||
829 | } | |
830 | ||
831 | /* | |
832 | * If the port was already initialised (eg, by a boot loader), | |
833 | * try to determine the current setup. | |
834 | */ | |
835 | static void __init | |
836 | bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud, | |
837 | int *parity, int *bits) | |
838 | { | |
839 | unsigned short status; | |
840 | ||
841 | status = UART_GET_IER(uart) & (ERBFI | ETBEI); | |
842 | if (status == (ERBFI | ETBEI)) { | |
843 | /* ok, the port was enabled */ | |
844 | unsigned short lcr, val; | |
845 | unsigned short dlh, dll; | |
846 | ||
847 | lcr = UART_GET_LCR(uart); | |
848 | ||
849 | *parity = 'n'; | |
850 | if (lcr & PEN) { | |
851 | if (lcr & EPS) | |
852 | *parity = 'e'; | |
853 | else | |
854 | *parity = 'o'; | |
855 | } | |
856 | switch (lcr & 0x03) { | |
857 | case 0: *bits = 5; break; | |
858 | case 1: *bits = 6; break; | |
859 | case 2: *bits = 7; break; | |
860 | case 3: *bits = 8; break; | |
861 | } | |
862 | /* Set DLAB in LCR to Access DLL and DLH */ | |
863 | val = UART_GET_LCR(uart); | |
864 | val |= DLAB; | |
865 | UART_PUT_LCR(uart, val); | |
866 | ||
867 | dll = UART_GET_DLL(uart); | |
868 | dlh = UART_GET_DLH(uart); | |
869 | ||
870 | /* Clear DLAB in LCR to Access THR RBR IER */ | |
871 | val = UART_GET_LCR(uart); | |
872 | val &= ~DLAB; | |
873 | UART_PUT_LCR(uart, val); | |
874 | ||
875 | *baud = get_sclk() / (16*(dll | dlh << 8)); | |
876 | } | |
877 | pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __FUNCTION__, *baud, *parity, *bits); | |
878 | } | |
879 | ||
880 | static int __init | |
881 | bfin_serial_console_setup(struct console *co, char *options) | |
882 | { | |
883 | struct bfin_serial_port *uart; | |
884 | int baud = 57600; | |
885 | int bits = 8; | |
886 | int parity = 'n'; | |
887 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS | |
888 | int flow = 'r'; | |
889 | #else | |
890 | int flow = 'n'; | |
891 | #endif | |
892 | ||
893 | /* | |
894 | * Check whether an invalid uart number has been specified, and | |
895 | * if so, search for the first available port that does have | |
896 | * console support. | |
897 | */ | |
898 | if (co->index == -1 || co->index >= nr_ports) | |
899 | co->index = 0; | |
900 | uart = &bfin_serial_ports[co->index]; | |
901 | ||
902 | if (options) | |
903 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
904 | else | |
905 | bfin_serial_console_get_options(uart, &baud, &parity, &bits); | |
906 | ||
907 | return uart_set_options(&uart->port, co, baud, parity, bits, flow); | |
908 | } | |
909 | ||
910 | static struct uart_driver bfin_serial_reg; | |
911 | static struct console bfin_serial_console = { | |
912 | .name = BFIN_SERIAL_NAME, | |
913 | .write = bfin_serial_console_write, | |
914 | .device = uart_console_device, | |
915 | .setup = bfin_serial_console_setup, | |
916 | .flags = CON_PRINTBUFFER, | |
917 | .index = -1, | |
918 | .data = &bfin_serial_reg, | |
919 | }; | |
920 | ||
921 | static int __init bfin_serial_rs_console_init(void) | |
922 | { | |
923 | bfin_serial_init_ports(); | |
924 | register_console(&bfin_serial_console); | |
925 | return 0; | |
926 | } | |
927 | console_initcall(bfin_serial_rs_console_init); | |
928 | ||
929 | #define BFIN_SERIAL_CONSOLE &bfin_serial_console | |
930 | #else | |
931 | #define BFIN_SERIAL_CONSOLE NULL | |
932 | #endif | |
933 | ||
934 | static struct uart_driver bfin_serial_reg = { | |
935 | .owner = THIS_MODULE, | |
936 | .driver_name = "bfin-uart", | |
937 | .dev_name = BFIN_SERIAL_NAME, | |
938 | .major = BFIN_SERIAL_MAJOR, | |
939 | .minor = BFIN_SERIAL_MINOR, | |
940 | .nr = NR_PORTS, | |
941 | .cons = BFIN_SERIAL_CONSOLE, | |
942 | }; | |
943 | ||
944 | static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state) | |
945 | { | |
946 | struct bfin_serial_port *uart = platform_get_drvdata(dev); | |
947 | ||
948 | if (uart) | |
949 | uart_suspend_port(&bfin_serial_reg, &uart->port); | |
950 | ||
951 | return 0; | |
952 | } | |
953 | ||
954 | static int bfin_serial_resume(struct platform_device *dev) | |
955 | { | |
956 | struct bfin_serial_port *uart = platform_get_drvdata(dev); | |
957 | ||
958 | if (uart) | |
959 | uart_resume_port(&bfin_serial_reg, &uart->port); | |
960 | ||
961 | return 0; | |
962 | } | |
963 | ||
964 | static int bfin_serial_probe(struct platform_device *dev) | |
965 | { | |
966 | struct resource *res = dev->resource; | |
967 | int i; | |
968 | ||
969 | for (i = 0; i < dev->num_resources; i++, res++) | |
970 | if (res->flags & IORESOURCE_MEM) | |
971 | break; | |
972 | ||
973 | if (i < dev->num_resources) { | |
974 | for (i = 0; i < nr_ports; i++, res++) { | |
975 | if (bfin_serial_ports[i].port.mapbase != res->start) | |
976 | continue; | |
977 | bfin_serial_ports[i].port.dev = &dev->dev; | |
978 | uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port); | |
979 | platform_set_drvdata(dev, &bfin_serial_ports[i]); | |
980 | } | |
981 | } | |
982 | ||
983 | return 0; | |
984 | } | |
985 | ||
986 | static int bfin_serial_remove(struct platform_device *pdev) | |
987 | { | |
988 | struct bfin_serial_port *uart = platform_get_drvdata(pdev); | |
989 | ||
990 | ||
991 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS | |
992 | gpio_free(uart->cts_pin); | |
993 | gpio_free(uart->rts_pin); | |
994 | #endif | |
995 | ||
996 | platform_set_drvdata(pdev, NULL); | |
997 | ||
998 | if (uart) | |
999 | uart_remove_one_port(&bfin_serial_reg, &uart->port); | |
1000 | ||
1001 | return 0; | |
1002 | } | |
1003 | ||
1004 | static struct platform_driver bfin_serial_driver = { | |
1005 | .probe = bfin_serial_probe, | |
1006 | .remove = bfin_serial_remove, | |
1007 | .suspend = bfin_serial_suspend, | |
1008 | .resume = bfin_serial_resume, | |
1009 | .driver = { | |
1010 | .name = "bfin-uart", | |
1011 | }, | |
1012 | }; | |
1013 | ||
1014 | static int __init bfin_serial_init(void) | |
1015 | { | |
1016 | int ret; | |
1017 | ||
1018 | pr_info("Serial: Blackfin serial driver\n"); | |
1019 | ||
1020 | bfin_serial_init_ports(); | |
1021 | ||
1022 | ret = uart_register_driver(&bfin_serial_reg); | |
1023 | if (ret == 0) { | |
1024 | ret = platform_driver_register(&bfin_serial_driver); | |
1025 | if (ret) { | |
1026 | pr_debug("uart register failed\n"); | |
1027 | uart_unregister_driver(&bfin_serial_reg); | |
1028 | } | |
1029 | } | |
1030 | return ret; | |
1031 | } | |
1032 | ||
1033 | static void __exit bfin_serial_exit(void) | |
1034 | { | |
1035 | platform_driver_unregister(&bfin_serial_driver); | |
1036 | uart_unregister_driver(&bfin_serial_reg); | |
1037 | } | |
1038 | ||
1039 | module_init(bfin_serial_init); | |
1040 | module_exit(bfin_serial_exit); | |
1041 | ||
1042 | MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>"); | |
1043 | MODULE_DESCRIPTION("Blackfin generic serial port driver"); | |
1044 | MODULE_LICENSE("GPL"); | |
1045 | MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR); |