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1da177e4 LT |
1 | /************************************************************************ |
2 | * Copyright 2003 Digi International (www.digi.com) | |
3 | * | |
4 | * Copyright (C) 2004 IBM Corporation. All rights reserved. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2, or (at your option) | |
9 | * any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the | |
13 | * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR | |
14 | * PURPOSE. See the GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 * Temple Place - Suite 330, Boston, | |
19 | * MA 02111-1307, USA. | |
20 | * | |
21 | * Contact Information: | |
22 | * Scott H Kilau <Scott_Kilau@digi.com> | |
2a08b4e9 | 23 | * Wendy Xiong <wendyx@us.ibm.com> |
1da177e4 LT |
24 | * |
25 | ***********************************************************************/ | |
26 | #include <linux/delay.h> /* For udelay */ | |
27 | #include <linux/serial_reg.h> /* For the various UART offsets */ | |
28 | #include <linux/tty.h> | |
29 | #include <linux/pci.h> | |
30 | #include <asm/io.h> | |
31 | ||
32 | #include "jsm.h" /* Driver main header file */ | |
33 | ||
34 | static u32 jsm_offset_table[8] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 }; | |
35 | ||
36 | /* | |
37 | * This function allows calls to ensure that all outstanding | |
38 | * PCI writes have been completed, by doing a PCI read against | |
39 | * a non-destructive, read-only location on the Neo card. | |
40 | * | |
41 | * In this case, we are reading the DVID (Read-only Device Identification) | |
42 | * value of the Neo card. | |
43 | */ | |
44 | static inline void neo_pci_posting_flush(struct jsm_board *bd) | |
45 | { | |
46 | readb(bd->re_map_membase + 0x8D); | |
47 | } | |
48 | ||
49 | static void neo_set_cts_flow_control(struct jsm_channel *ch) | |
50 | { | |
c2236956 AK |
51 | u8 ier, efr; |
52 | ier = readb(&ch->ch_neo_uart->ier); | |
53 | efr = readb(&ch->ch_neo_uart->efr); | |
1da177e4 | 54 | |
669fef46 | 55 | jsm_dbg(PARAM, &ch->ch_bd->pci_dev, "Setting CTSFLOW\n"); |
1da177e4 LT |
56 | |
57 | /* Turn on auto CTS flow control */ | |
58 | ier |= (UART_17158_IER_CTSDSR); | |
59 | efr |= (UART_17158_EFR_ECB | UART_17158_EFR_CTSDSR); | |
60 | ||
61 | /* Turn off auto Xon flow control */ | |
62 | efr &= ~(UART_17158_EFR_IXON); | |
63 | ||
64 | /* Why? Becuz Exar's spec says we have to zero it out before setting it */ | |
65 | writeb(0, &ch->ch_neo_uart->efr); | |
66 | ||
67 | /* Turn on UART enhanced bits */ | |
68 | writeb(efr, &ch->ch_neo_uart->efr); | |
69 | ||
70 | /* Turn on table D, with 8 char hi/low watermarks */ | |
71 | writeb((UART_17158_FCTR_TRGD | UART_17158_FCTR_RTS_4DELAY), &ch->ch_neo_uart->fctr); | |
72 | ||
73 | /* Feed the UART our trigger levels */ | |
74 | writeb(8, &ch->ch_neo_uart->tfifo); | |
75 | ch->ch_t_tlevel = 8; | |
76 | ||
77 | writeb(ier, &ch->ch_neo_uart->ier); | |
78 | } | |
79 | ||
80 | static void neo_set_rts_flow_control(struct jsm_channel *ch) | |
81 | { | |
c2236956 AK |
82 | u8 ier, efr; |
83 | ier = readb(&ch->ch_neo_uart->ier); | |
84 | efr = readb(&ch->ch_neo_uart->efr); | |
1da177e4 | 85 | |
669fef46 | 86 | jsm_dbg(PARAM, &ch->ch_bd->pci_dev, "Setting RTSFLOW\n"); |
1da177e4 LT |
87 | |
88 | /* Turn on auto RTS flow control */ | |
89 | ier |= (UART_17158_IER_RTSDTR); | |
90 | efr |= (UART_17158_EFR_ECB | UART_17158_EFR_RTSDTR); | |
91 | ||
92 | /* Turn off auto Xoff flow control */ | |
93 | ier &= ~(UART_17158_IER_XOFF); | |
94 | efr &= ~(UART_17158_EFR_IXOFF); | |
95 | ||
96 | /* Why? Becuz Exar's spec says we have to zero it out before setting it */ | |
97 | writeb(0, &ch->ch_neo_uart->efr); | |
98 | ||
99 | /* Turn on UART enhanced bits */ | |
100 | writeb(efr, &ch->ch_neo_uart->efr); | |
101 | ||
102 | writeb((UART_17158_FCTR_TRGD | UART_17158_FCTR_RTS_4DELAY), &ch->ch_neo_uart->fctr); | |
103 | ch->ch_r_watermark = 4; | |
104 | ||
105 | writeb(56, &ch->ch_neo_uart->rfifo); | |
106 | ch->ch_r_tlevel = 56; | |
107 | ||
108 | writeb(ier, &ch->ch_neo_uart->ier); | |
109 | ||
110 | /* | |
111 | * From the Neo UART spec sheet: | |
112 | * The auto RTS/DTR function must be started by asserting | |
113 | * RTS/DTR# output pin (MCR bit-0 or 1 to logic 1 after | |
114 | * it is enabled. | |
115 | */ | |
116 | ch->ch_mostat |= (UART_MCR_RTS); | |
117 | } | |
118 | ||
119 | ||
120 | static void neo_set_ixon_flow_control(struct jsm_channel *ch) | |
121 | { | |
c2236956 AK |
122 | u8 ier, efr; |
123 | ier = readb(&ch->ch_neo_uart->ier); | |
124 | efr = readb(&ch->ch_neo_uart->efr); | |
1da177e4 | 125 | |
669fef46 | 126 | jsm_dbg(PARAM, &ch->ch_bd->pci_dev, "Setting IXON FLOW\n"); |
1da177e4 LT |
127 | |
128 | /* Turn off auto CTS flow control */ | |
129 | ier &= ~(UART_17158_IER_CTSDSR); | |
130 | efr &= ~(UART_17158_EFR_CTSDSR); | |
131 | ||
132 | /* Turn on auto Xon flow control */ | |
133 | efr |= (UART_17158_EFR_ECB | UART_17158_EFR_IXON); | |
134 | ||
135 | /* Why? Becuz Exar's spec says we have to zero it out before setting it */ | |
136 | writeb(0, &ch->ch_neo_uart->efr); | |
137 | ||
138 | /* Turn on UART enhanced bits */ | |
139 | writeb(efr, &ch->ch_neo_uart->efr); | |
140 | ||
141 | writeb((UART_17158_FCTR_TRGD | UART_17158_FCTR_RTS_8DELAY), &ch->ch_neo_uart->fctr); | |
142 | ch->ch_r_watermark = 4; | |
143 | ||
144 | writeb(32, &ch->ch_neo_uart->rfifo); | |
145 | ch->ch_r_tlevel = 32; | |
146 | ||
147 | /* Tell UART what start/stop chars it should be looking for */ | |
148 | writeb(ch->ch_startc, &ch->ch_neo_uart->xonchar1); | |
149 | writeb(0, &ch->ch_neo_uart->xonchar2); | |
150 | ||
151 | writeb(ch->ch_stopc, &ch->ch_neo_uart->xoffchar1); | |
152 | writeb(0, &ch->ch_neo_uart->xoffchar2); | |
153 | ||
154 | writeb(ier, &ch->ch_neo_uart->ier); | |
155 | } | |
156 | ||
157 | static void neo_set_ixoff_flow_control(struct jsm_channel *ch) | |
158 | { | |
c2236956 AK |
159 | u8 ier, efr; |
160 | ier = readb(&ch->ch_neo_uart->ier); | |
161 | efr = readb(&ch->ch_neo_uart->efr); | |
1da177e4 | 162 | |
669fef46 | 163 | jsm_dbg(PARAM, &ch->ch_bd->pci_dev, "Setting IXOFF FLOW\n"); |
1da177e4 LT |
164 | |
165 | /* Turn off auto RTS flow control */ | |
166 | ier &= ~(UART_17158_IER_RTSDTR); | |
167 | efr &= ~(UART_17158_EFR_RTSDTR); | |
168 | ||
169 | /* Turn on auto Xoff flow control */ | |
170 | ier |= (UART_17158_IER_XOFF); | |
171 | efr |= (UART_17158_EFR_ECB | UART_17158_EFR_IXOFF); | |
172 | ||
173 | /* Why? Becuz Exar's spec says we have to zero it out before setting it */ | |
174 | writeb(0, &ch->ch_neo_uart->efr); | |
175 | ||
176 | /* Turn on UART enhanced bits */ | |
177 | writeb(efr, &ch->ch_neo_uart->efr); | |
178 | ||
179 | /* Turn on table D, with 8 char hi/low watermarks */ | |
180 | writeb((UART_17158_FCTR_TRGD | UART_17158_FCTR_RTS_8DELAY), &ch->ch_neo_uart->fctr); | |
181 | ||
182 | writeb(8, &ch->ch_neo_uart->tfifo); | |
183 | ch->ch_t_tlevel = 8; | |
184 | ||
185 | /* Tell UART what start/stop chars it should be looking for */ | |
186 | writeb(ch->ch_startc, &ch->ch_neo_uart->xonchar1); | |
187 | writeb(0, &ch->ch_neo_uart->xonchar2); | |
188 | ||
189 | writeb(ch->ch_stopc, &ch->ch_neo_uart->xoffchar1); | |
190 | writeb(0, &ch->ch_neo_uart->xoffchar2); | |
191 | ||
192 | writeb(ier, &ch->ch_neo_uart->ier); | |
193 | } | |
194 | ||
195 | static void neo_set_no_input_flow_control(struct jsm_channel *ch) | |
196 | { | |
c2236956 AK |
197 | u8 ier, efr; |
198 | ier = readb(&ch->ch_neo_uart->ier); | |
199 | efr = readb(&ch->ch_neo_uart->efr); | |
1da177e4 | 200 | |
669fef46 | 201 | jsm_dbg(PARAM, &ch->ch_bd->pci_dev, "Unsetting Input FLOW\n"); |
1da177e4 LT |
202 | |
203 | /* Turn off auto RTS flow control */ | |
204 | ier &= ~(UART_17158_IER_RTSDTR); | |
205 | efr &= ~(UART_17158_EFR_RTSDTR); | |
206 | ||
207 | /* Turn off auto Xoff flow control */ | |
208 | ier &= ~(UART_17158_IER_XOFF); | |
209 | if (ch->ch_c_iflag & IXON) | |
210 | efr &= ~(UART_17158_EFR_IXOFF); | |
211 | else | |
212 | efr &= ~(UART_17158_EFR_ECB | UART_17158_EFR_IXOFF); | |
213 | ||
214 | /* Why? Becuz Exar's spec says we have to zero it out before setting it */ | |
215 | writeb(0, &ch->ch_neo_uart->efr); | |
216 | ||
217 | /* Turn on UART enhanced bits */ | |
218 | writeb(efr, &ch->ch_neo_uart->efr); | |
219 | ||
220 | /* Turn on table D, with 8 char hi/low watermarks */ | |
221 | writeb((UART_17158_FCTR_TRGD | UART_17158_FCTR_RTS_8DELAY), &ch->ch_neo_uart->fctr); | |
222 | ||
223 | ch->ch_r_watermark = 0; | |
224 | ||
225 | writeb(16, &ch->ch_neo_uart->tfifo); | |
226 | ch->ch_t_tlevel = 16; | |
227 | ||
228 | writeb(16, &ch->ch_neo_uart->rfifo); | |
229 | ch->ch_r_tlevel = 16; | |
230 | ||
231 | writeb(ier, &ch->ch_neo_uart->ier); | |
232 | } | |
233 | ||
234 | static void neo_set_no_output_flow_control(struct jsm_channel *ch) | |
235 | { | |
c2236956 AK |
236 | u8 ier, efr; |
237 | ier = readb(&ch->ch_neo_uart->ier); | |
238 | efr = readb(&ch->ch_neo_uart->efr); | |
1da177e4 | 239 | |
669fef46 | 240 | jsm_dbg(PARAM, &ch->ch_bd->pci_dev, "Unsetting Output FLOW\n"); |
1da177e4 LT |
241 | |
242 | /* Turn off auto CTS flow control */ | |
243 | ier &= ~(UART_17158_IER_CTSDSR); | |
244 | efr &= ~(UART_17158_EFR_CTSDSR); | |
245 | ||
246 | /* Turn off auto Xon flow control */ | |
247 | if (ch->ch_c_iflag & IXOFF) | |
248 | efr &= ~(UART_17158_EFR_IXON); | |
249 | else | |
250 | efr &= ~(UART_17158_EFR_ECB | UART_17158_EFR_IXON); | |
251 | ||
252 | /* Why? Becuz Exar's spec says we have to zero it out before setting it */ | |
253 | writeb(0, &ch->ch_neo_uart->efr); | |
254 | ||
255 | /* Turn on UART enhanced bits */ | |
256 | writeb(efr, &ch->ch_neo_uart->efr); | |
257 | ||
258 | /* Turn on table D, with 8 char hi/low watermarks */ | |
259 | writeb((UART_17158_FCTR_TRGD | UART_17158_FCTR_RTS_8DELAY), &ch->ch_neo_uart->fctr); | |
260 | ||
261 | ch->ch_r_watermark = 0; | |
262 | ||
263 | writeb(16, &ch->ch_neo_uart->tfifo); | |
264 | ch->ch_t_tlevel = 16; | |
265 | ||
266 | writeb(16, &ch->ch_neo_uart->rfifo); | |
267 | ch->ch_r_tlevel = 16; | |
268 | ||
269 | writeb(ier, &ch->ch_neo_uart->ier); | |
270 | } | |
271 | ||
272 | static inline void neo_set_new_start_stop_chars(struct jsm_channel *ch) | |
273 | { | |
274 | ||
275 | /* if hardware flow control is set, then skip this whole thing */ | |
276 | if (ch->ch_c_cflag & CRTSCTS) | |
277 | return; | |
278 | ||
669fef46 | 279 | jsm_dbg(PARAM, &ch->ch_bd->pci_dev, "start\n"); |
1da177e4 LT |
280 | |
281 | /* Tell UART what start/stop chars it should be looking for */ | |
282 | writeb(ch->ch_startc, &ch->ch_neo_uart->xonchar1); | |
283 | writeb(0, &ch->ch_neo_uart->xonchar2); | |
284 | ||
285 | writeb(ch->ch_stopc, &ch->ch_neo_uart->xoffchar1); | |
286 | writeb(0, &ch->ch_neo_uart->xoffchar2); | |
287 | } | |
288 | ||
289 | static void neo_copy_data_from_uart_to_queue(struct jsm_channel *ch) | |
290 | { | |
291 | int qleft = 0; | |
292 | u8 linestatus = 0; | |
293 | u8 error_mask = 0; | |
294 | int n = 0; | |
295 | int total = 0; | |
296 | u16 head; | |
297 | u16 tail; | |
298 | ||
299 | if (!ch) | |
300 | return; | |
301 | ||
302 | /* cache head and tail of queue */ | |
303 | head = ch->ch_r_head & RQUEUEMASK; | |
304 | tail = ch->ch_r_tail & RQUEUEMASK; | |
305 | ||
306 | /* Get our cached LSR */ | |
307 | linestatus = ch->ch_cached_lsr; | |
308 | ch->ch_cached_lsr = 0; | |
309 | ||
310 | /* Store how much space we have left in the queue */ | |
311 | if ((qleft = tail - head - 1) < 0) | |
312 | qleft += RQUEUEMASK + 1; | |
313 | ||
314 | /* | |
315 | * If the UART is not in FIFO mode, force the FIFO copy to | |
316 | * NOT be run, by setting total to 0. | |
317 | * | |
318 | * On the other hand, if the UART IS in FIFO mode, then ask | |
319 | * the UART to give us an approximation of data it has RX'ed. | |
320 | */ | |
321 | if (!(ch->ch_flags & CH_FIFO_ENABLED)) | |
322 | total = 0; | |
323 | else { | |
324 | total = readb(&ch->ch_neo_uart->rfifo); | |
325 | ||
326 | /* | |
327 | * EXAR chip bug - RX FIFO COUNT - Fudge factor. | |
328 | * | |
329 | * This resolves a problem/bug with the Exar chip that sometimes | |
330 | * returns a bogus value in the rfifo register. | |
331 | * The count can be any where from 0-3 bytes "off". | |
332 | * Bizarre, but true. | |
333 | */ | |
334 | total -= 3; | |
335 | } | |
336 | ||
337 | /* | |
338 | * Finally, bound the copy to make sure we don't overflow | |
339 | * our own queue... | |
340 | * The byte by byte copy loop below this loop this will | |
341 | * deal with the queue overflow possibility. | |
342 | */ | |
343 | total = min(total, qleft); | |
344 | ||
345 | while (total > 0) { | |
346 | /* | |
347 | * Grab the linestatus register, we need to check | |
348 | * to see if there are any errors in the FIFO. | |
349 | */ | |
350 | linestatus = readb(&ch->ch_neo_uart->lsr); | |
351 | ||
352 | /* | |
353 | * Break out if there is a FIFO error somewhere. | |
354 | * This will allow us to go byte by byte down below, | |
355 | * finding the exact location of the error. | |
356 | */ | |
357 | if (linestatus & UART_17158_RX_FIFO_DATA_ERROR) | |
358 | break; | |
359 | ||
360 | /* Make sure we don't go over the end of our queue */ | |
361 | n = min(((u32) total), (RQUEUESIZE - (u32) head)); | |
362 | ||
363 | /* | |
364 | * Cut down n even further if needed, this is to fix | |
365 | * a problem with memcpy_fromio() with the Neo on the | |
366 | * IBM pSeries platform. | |
367 | * 15 bytes max appears to be the magic number. | |
368 | */ | |
369 | n = min((u32) n, (u32) 12); | |
370 | ||
371 | /* | |
372 | * Since we are grabbing the linestatus register, which | |
373 | * will reset some bits after our read, we need to ensure | |
374 | * we don't miss our TX FIFO emptys. | |
375 | */ | |
376 | if (linestatus & (UART_LSR_THRE | UART_17158_TX_AND_FIFO_CLR)) | |
377 | ch->ch_flags |= (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM); | |
378 | ||
379 | linestatus = 0; | |
380 | ||
381 | /* Copy data from uart to the queue */ | |
382 | memcpy_fromio(ch->ch_rqueue + head, &ch->ch_neo_uart->txrxburst, n); | |
383 | /* | |
25985edc | 384 | * Since RX_FIFO_DATA_ERROR was 0, we are guaranteed |
1da177e4 LT |
385 | * that all the data currently in the FIFO is free of |
386 | * breaks and parity/frame/orun errors. | |
387 | */ | |
388 | memset(ch->ch_equeue + head, 0, n); | |
389 | ||
390 | /* Add to and flip head if needed */ | |
391 | head = (head + n) & RQUEUEMASK; | |
392 | total -= n; | |
393 | qleft -= n; | |
394 | ch->ch_rxcount += n; | |
395 | } | |
396 | ||
397 | /* | |
398 | * Create a mask to determine whether we should | |
399 | * insert the character (if any) into our queue. | |
400 | */ | |
401 | if (ch->ch_c_iflag & IGNBRK) | |
402 | error_mask |= UART_LSR_BI; | |
403 | ||
404 | /* | |
405 | * Now cleanup any leftover bytes still in the UART. | |
406 | * Also deal with any possible queue overflow here as well. | |
407 | */ | |
408 | while (1) { | |
409 | ||
410 | /* | |
411 | * Its possible we have a linestatus from the loop above | |
412 | * this, so we "OR" on any extra bits. | |
413 | */ | |
414 | linestatus |= readb(&ch->ch_neo_uart->lsr); | |
415 | ||
416 | /* | |
417 | * If the chip tells us there is no more data pending to | |
418 | * be read, we can then leave. | |
419 | * But before we do, cache the linestatus, just in case. | |
420 | */ | |
421 | if (!(linestatus & UART_LSR_DR)) { | |
422 | ch->ch_cached_lsr = linestatus; | |
423 | break; | |
424 | } | |
425 | ||
426 | /* No need to store this bit */ | |
427 | linestatus &= ~UART_LSR_DR; | |
428 | ||
429 | /* | |
430 | * Since we are grabbing the linestatus register, which | |
431 | * will reset some bits after our read, we need to ensure | |
432 | * we don't miss our TX FIFO emptys. | |
433 | */ | |
434 | if (linestatus & (UART_LSR_THRE | UART_17158_TX_AND_FIFO_CLR)) { | |
435 | linestatus &= ~(UART_LSR_THRE | UART_17158_TX_AND_FIFO_CLR); | |
436 | ch->ch_flags |= (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM); | |
437 | } | |
438 | ||
439 | /* | |
440 | * Discard character if we are ignoring the error mask. | |
441 | */ | |
442 | if (linestatus & error_mask) { | |
443 | u8 discard; | |
444 | linestatus = 0; | |
445 | memcpy_fromio(&discard, &ch->ch_neo_uart->txrxburst, 1); | |
446 | continue; | |
447 | } | |
448 | ||
449 | /* | |
450 | * If our queue is full, we have no choice but to drop some data. | |
451 | * The assumption is that HWFLOW or SWFLOW should have stopped | |
452 | * things way way before we got to this point. | |
453 | * | |
454 | * I decided that I wanted to ditch the oldest data first, | |
455 | * I hope thats okay with everyone? Yes? Good. | |
456 | */ | |
457 | while (qleft < 1) { | |
669fef46 | 458 | jsm_dbg(READ, &ch->ch_bd->pci_dev, |
1da177e4 LT |
459 | "Queue full, dropping DATA:%x LSR:%x\n", |
460 | ch->ch_rqueue[tail], ch->ch_equeue[tail]); | |
461 | ||
462 | ch->ch_r_tail = tail = (tail + 1) & RQUEUEMASK; | |
463 | ch->ch_err_overrun++; | |
464 | qleft++; | |
465 | } | |
466 | ||
467 | memcpy_fromio(ch->ch_rqueue + head, &ch->ch_neo_uart->txrxburst, 1); | |
468 | ch->ch_equeue[head] = (u8) linestatus; | |
469 | ||
669fef46 JP |
470 | jsm_dbg(READ, &ch->ch_bd->pci_dev, "DATA/LSR pair: %x %x\n", |
471 | ch->ch_rqueue[head], ch->ch_equeue[head]); | |
1da177e4 LT |
472 | |
473 | /* Ditch any remaining linestatus value. */ | |
474 | linestatus = 0; | |
475 | ||
476 | /* Add to and flip head if needed */ | |
477 | head = (head + 1) & RQUEUEMASK; | |
478 | ||
479 | qleft--; | |
480 | ch->ch_rxcount++; | |
481 | } | |
482 | ||
483 | /* | |
484 | * Write new final heads to channel structure. | |
485 | */ | |
486 | ch->ch_r_head = head & RQUEUEMASK; | |
487 | ch->ch_e_head = head & EQUEUEMASK; | |
488 | jsm_input(ch); | |
489 | } | |
490 | ||
491 | static void neo_copy_data_from_queue_to_uart(struct jsm_channel *ch) | |
492 | { | |
493 | u16 head; | |
494 | u16 tail; | |
495 | int n; | |
496 | int s; | |
497 | int qlen; | |
498 | u32 len_written = 0; | |
9d898966 | 499 | struct circ_buf *circ; |
1da177e4 LT |
500 | |
501 | if (!ch) | |
502 | return; | |
503 | ||
9d898966 TLSC |
504 | circ = &ch->uart_port.state->xmit; |
505 | ||
1da177e4 | 506 | /* No data to write to the UART */ |
9d898966 | 507 | if (uart_circ_empty(circ)) |
1da177e4 LT |
508 | return; |
509 | ||
510 | /* If port is "stopped", don't send any data to the UART */ | |
511 | if ((ch->ch_flags & CH_STOP) || (ch->ch_flags & CH_BREAK_SENDING)) | |
512 | return; | |
513 | /* | |
514 | * If FIFOs are disabled. Send data directly to txrx register | |
515 | */ | |
516 | if (!(ch->ch_flags & CH_FIFO_ENABLED)) { | |
517 | u8 lsrbits = readb(&ch->ch_neo_uart->lsr); | |
518 | ||
519 | ch->ch_cached_lsr |= lsrbits; | |
520 | if (ch->ch_cached_lsr & UART_LSR_THRE) { | |
521 | ch->ch_cached_lsr &= ~(UART_LSR_THRE); | |
522 | ||
9d898966 | 523 | writeb(circ->buf[circ->tail], &ch->ch_neo_uart->txrx); |
669fef46 JP |
524 | jsm_dbg(WRITE, &ch->ch_bd->pci_dev, |
525 | "Tx data: %x\n", circ->buf[circ->tail]); | |
9d898966 | 526 | circ->tail = (circ->tail + 1) & (UART_XMIT_SIZE - 1); |
1da177e4 LT |
527 | ch->ch_txcount++; |
528 | } | |
529 | return; | |
530 | } | |
531 | ||
532 | /* | |
533 | * We have to do it this way, because of the EXAR TXFIFO count bug. | |
534 | */ | |
535 | if (!(ch->ch_flags & (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM))) | |
536 | return; | |
537 | ||
1da177e4 LT |
538 | n = UART_17158_TX_FIFOSIZE - ch->ch_t_tlevel; |
539 | ||
540 | /* cache head and tail of queue */ | |
9d898966 TLSC |
541 | head = circ->head & (UART_XMIT_SIZE - 1); |
542 | tail = circ->tail & (UART_XMIT_SIZE - 1); | |
543 | qlen = uart_circ_chars_pending(circ); | |
1da177e4 LT |
544 | |
545 | /* Find minimum of the FIFO space, versus queue length */ | |
546 | n = min(n, qlen); | |
547 | ||
548 | while (n > 0) { | |
549 | ||
9d898966 | 550 | s = ((head >= tail) ? head : UART_XMIT_SIZE) - tail; |
1da177e4 LT |
551 | s = min(s, n); |
552 | ||
553 | if (s <= 0) | |
554 | break; | |
555 | ||
9d898966 | 556 | memcpy_toio(&ch->ch_neo_uart->txrxburst, circ->buf + tail, s); |
1da177e4 | 557 | /* Add and flip queue if needed */ |
9d898966 | 558 | tail = (tail + s) & (UART_XMIT_SIZE - 1); |
1da177e4 LT |
559 | n -= s; |
560 | ch->ch_txcount += s; | |
561 | len_written += s; | |
562 | } | |
563 | ||
564 | /* Update the final tail */ | |
9d898966 | 565 | circ->tail = tail & (UART_XMIT_SIZE - 1); |
1da177e4 LT |
566 | |
567 | if (len_written >= ch->ch_t_tlevel) | |
568 | ch->ch_flags &= ~(CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM); | |
569 | ||
9d898966 | 570 | if (uart_circ_empty(circ)) |
1da177e4 LT |
571 | uart_write_wakeup(&ch->uart_port); |
572 | } | |
573 | ||
574 | static void neo_parse_modem(struct jsm_channel *ch, u8 signals) | |
575 | { | |
576 | u8 msignals = signals; | |
577 | ||
669fef46 JP |
578 | jsm_dbg(MSIGS, &ch->ch_bd->pci_dev, |
579 | "neo_parse_modem: port: %d msignals: %x\n", | |
580 | ch->ch_portnum, msignals); | |
1da177e4 | 581 | |
1da177e4 | 582 | /* Scrub off lower bits. They signify delta's, which I don't care about */ |
e97cb3e2 LS |
583 | /* Keep DDCD and DDSR though */ |
584 | msignals &= 0xf8; | |
1da177e4 | 585 | |
e97cb3e2 LS |
586 | if (msignals & UART_MSR_DDCD) |
587 | uart_handle_dcd_change(&ch->uart_port, msignals & UART_MSR_DCD); | |
588 | if (msignals & UART_MSR_DDSR) | |
589 | uart_handle_cts_change(&ch->uart_port, msignals & UART_MSR_CTS); | |
1da177e4 LT |
590 | if (msignals & UART_MSR_DCD) |
591 | ch->ch_mistat |= UART_MSR_DCD; | |
592 | else | |
593 | ch->ch_mistat &= ~UART_MSR_DCD; | |
594 | ||
595 | if (msignals & UART_MSR_DSR) | |
596 | ch->ch_mistat |= UART_MSR_DSR; | |
597 | else | |
598 | ch->ch_mistat &= ~UART_MSR_DSR; | |
599 | ||
600 | if (msignals & UART_MSR_RI) | |
601 | ch->ch_mistat |= UART_MSR_RI; | |
602 | else | |
603 | ch->ch_mistat &= ~UART_MSR_RI; | |
604 | ||
605 | if (msignals & UART_MSR_CTS) | |
606 | ch->ch_mistat |= UART_MSR_CTS; | |
607 | else | |
608 | ch->ch_mistat &= ~UART_MSR_CTS; | |
609 | ||
669fef46 JP |
610 | jsm_dbg(MSIGS, &ch->ch_bd->pci_dev, |
611 | "Port: %d DTR: %d RTS: %d CTS: %d DSR: %d " "RI: %d CD: %d\n", | |
1da177e4 LT |
612 | ch->ch_portnum, |
613 | !!((ch->ch_mistat | ch->ch_mostat) & UART_MCR_DTR), | |
614 | !!((ch->ch_mistat | ch->ch_mostat) & UART_MCR_RTS), | |
615 | !!((ch->ch_mistat | ch->ch_mostat) & UART_MSR_CTS), | |
616 | !!((ch->ch_mistat | ch->ch_mostat) & UART_MSR_DSR), | |
617 | !!((ch->ch_mistat | ch->ch_mostat) & UART_MSR_RI), | |
618 | !!((ch->ch_mistat | ch->ch_mostat) & UART_MSR_DCD)); | |
619 | } | |
620 | ||
621 | /* Make the UART raise any of the output signals we want up */ | |
622 | static void neo_assert_modem_signals(struct jsm_channel *ch) | |
623 | { | |
1da177e4 LT |
624 | if (!ch) |
625 | return; | |
626 | ||
8e7d91c9 | 627 | writeb(ch->ch_mostat, &ch->ch_neo_uart->mcr); |
1da177e4 LT |
628 | |
629 | /* flush write operation */ | |
630 | neo_pci_posting_flush(ch->ch_bd); | |
631 | } | |
632 | ||
633 | /* | |
634 | * Flush the WRITE FIFO on the Neo. | |
635 | * | |
636 | * NOTE: Channel lock MUST be held before calling this function! | |
637 | */ | |
638 | static void neo_flush_uart_write(struct jsm_channel *ch) | |
639 | { | |
640 | u8 tmp = 0; | |
641 | int i = 0; | |
642 | ||
643 | if (!ch) | |
644 | return; | |
645 | ||
646 | writeb((UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_XMIT), &ch->ch_neo_uart->isr_fcr); | |
647 | ||
648 | for (i = 0; i < 10; i++) { | |
649 | ||
650 | /* Check to see if the UART feels it completely flushed the FIFO. */ | |
651 | tmp = readb(&ch->ch_neo_uart->isr_fcr); | |
652 | if (tmp & 4) { | |
669fef46 JP |
653 | jsm_dbg(IOCTL, &ch->ch_bd->pci_dev, |
654 | "Still flushing TX UART... i: %d\n", i); | |
1da177e4 LT |
655 | udelay(10); |
656 | } | |
657 | else | |
658 | break; | |
659 | } | |
660 | ||
661 | ch->ch_flags |= (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM); | |
662 | } | |
663 | ||
664 | ||
665 | /* | |
666 | * Flush the READ FIFO on the Neo. | |
667 | * | |
668 | * NOTE: Channel lock MUST be held before calling this function! | |
669 | */ | |
670 | static void neo_flush_uart_read(struct jsm_channel *ch) | |
671 | { | |
672 | u8 tmp = 0; | |
673 | int i = 0; | |
674 | ||
675 | if (!ch) | |
676 | return; | |
677 | ||
678 | writeb((UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR), &ch->ch_neo_uart->isr_fcr); | |
679 | ||
680 | for (i = 0; i < 10; i++) { | |
681 | ||
682 | /* Check to see if the UART feels it completely flushed the FIFO. */ | |
683 | tmp = readb(&ch->ch_neo_uart->isr_fcr); | |
684 | if (tmp & 2) { | |
669fef46 JP |
685 | jsm_dbg(IOCTL, &ch->ch_bd->pci_dev, |
686 | "Still flushing RX UART... i: %d\n", i); | |
1da177e4 LT |
687 | udelay(10); |
688 | } | |
689 | else | |
690 | break; | |
691 | } | |
692 | } | |
693 | ||
694 | /* | |
695 | * No locks are assumed to be held when calling this function. | |
696 | */ | |
408b664a | 697 | static void neo_clear_break(struct jsm_channel *ch, int force) |
1da177e4 LT |
698 | { |
699 | unsigned long lock_flags; | |
700 | ||
701 | spin_lock_irqsave(&ch->ch_lock, lock_flags); | |
702 | ||
703 | /* Turn break off, and unset some variables */ | |
704 | if (ch->ch_flags & CH_BREAK_SENDING) { | |
705 | u8 temp = readb(&ch->ch_neo_uart->lcr); | |
706 | writeb((temp & ~UART_LCR_SBC), &ch->ch_neo_uart->lcr); | |
707 | ||
708 | ch->ch_flags &= ~(CH_BREAK_SENDING); | |
669fef46 JP |
709 | jsm_dbg(IOCTL, &ch->ch_bd->pci_dev, |
710 | "clear break Finishing UART_LCR_SBC! finished: %lx\n", | |
711 | jiffies); | |
1da177e4 LT |
712 | |
713 | /* flush write operation */ | |
714 | neo_pci_posting_flush(ch->ch_bd); | |
715 | } | |
716 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
717 | } | |
718 | ||
719 | /* | |
720 | * Parse the ISR register. | |
721 | */ | |
722 | static inline void neo_parse_isr(struct jsm_board *brd, u32 port) | |
723 | { | |
724 | struct jsm_channel *ch; | |
725 | u8 isr; | |
726 | u8 cause; | |
727 | unsigned long lock_flags; | |
728 | ||
729 | if (!brd) | |
730 | return; | |
731 | ||
732 | if (port > brd->maxports) | |
733 | return; | |
734 | ||
735 | ch = brd->channels[port]; | |
736 | if (!ch) | |
737 | return; | |
738 | ||
739 | /* Here we try to figure out what caused the interrupt to happen */ | |
740 | while (1) { | |
741 | ||
742 | isr = readb(&ch->ch_neo_uart->isr_fcr); | |
743 | ||
744 | /* Bail if no pending interrupt */ | |
745 | if (isr & UART_IIR_NO_INT) | |
746 | break; | |
747 | ||
748 | /* | |
749 | * Yank off the upper 2 bits, which just show that the FIFO's are enabled. | |
750 | */ | |
751 | isr &= ~(UART_17158_IIR_FIFO_ENABLED); | |
752 | ||
669fef46 JP |
753 | jsm_dbg(INTR, &ch->ch_bd->pci_dev, "%s:%d isr: %x\n", |
754 | __FILE__, __LINE__, isr); | |
1da177e4 LT |
755 | |
756 | if (isr & (UART_17158_IIR_RDI_TIMEOUT | UART_IIR_RDI)) { | |
757 | /* Read data from uart -> queue */ | |
758 | neo_copy_data_from_uart_to_queue(ch); | |
759 | ||
760 | /* Call our tty layer to enforce queue flow control if needed. */ | |
761 | spin_lock_irqsave(&ch->ch_lock, lock_flags); | |
762 | jsm_check_queue_flow_control(ch); | |
763 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
764 | } | |
765 | ||
766 | if (isr & UART_IIR_THRI) { | |
767 | /* Transfer data (if any) from Write Queue -> UART. */ | |
768 | spin_lock_irqsave(&ch->ch_lock, lock_flags); | |
769 | ch->ch_flags |= (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM); | |
770 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
771 | neo_copy_data_from_queue_to_uart(ch); | |
772 | } | |
773 | ||
774 | if (isr & UART_17158_IIR_XONXOFF) { | |
775 | cause = readb(&ch->ch_neo_uart->xoffchar1); | |
776 | ||
669fef46 JP |
777 | jsm_dbg(INTR, &ch->ch_bd->pci_dev, |
778 | "Port %d. Got ISR_XONXOFF: cause:%x\n", | |
779 | port, cause); | |
1da177e4 LT |
780 | |
781 | /* | |
782 | * Since the UART detected either an XON or | |
783 | * XOFF match, we need to figure out which | |
784 | * one it was, so we can suspend or resume data flow. | |
785 | */ | |
786 | spin_lock_irqsave(&ch->ch_lock, lock_flags); | |
787 | if (cause == UART_17158_XON_DETECT) { | |
788 | /* Is output stopped right now, if so, resume it */ | |
789 | if (brd->channels[port]->ch_flags & CH_STOP) { | |
790 | ch->ch_flags &= ~(CH_STOP); | |
791 | } | |
669fef46 JP |
792 | jsm_dbg(INTR, &ch->ch_bd->pci_dev, |
793 | "Port %d. XON detected in incoming data\n", | |
794 | port); | |
1da177e4 LT |
795 | } |
796 | else if (cause == UART_17158_XOFF_DETECT) { | |
797 | if (!(brd->channels[port]->ch_flags & CH_STOP)) { | |
798 | ch->ch_flags |= CH_STOP; | |
669fef46 JP |
799 | jsm_dbg(INTR, &ch->ch_bd->pci_dev, |
800 | "Setting CH_STOP\n"); | |
1da177e4 | 801 | } |
669fef46 JP |
802 | jsm_dbg(INTR, &ch->ch_bd->pci_dev, |
803 | "Port: %d. XOFF detected in incoming data\n", | |
804 | port); | |
1da177e4 LT |
805 | } |
806 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
807 | } | |
808 | ||
809 | if (isr & UART_17158_IIR_HWFLOW_STATE_CHANGE) { | |
810 | /* | |
811 | * If we get here, this means the hardware is doing auto flow control. | |
812 | * Check to see whether RTS/DTR or CTS/DSR caused this interrupt. | |
813 | */ | |
814 | cause = readb(&ch->ch_neo_uart->mcr); | |
815 | ||
816 | /* Which pin is doing auto flow? RTS or DTR? */ | |
817 | spin_lock_irqsave(&ch->ch_lock, lock_flags); | |
818 | if ((cause & 0x4) == 0) { | |
819 | if (cause & UART_MCR_RTS) | |
820 | ch->ch_mostat |= UART_MCR_RTS; | |
821 | else | |
822 | ch->ch_mostat &= ~(UART_MCR_RTS); | |
823 | } else { | |
824 | if (cause & UART_MCR_DTR) | |
825 | ch->ch_mostat |= UART_MCR_DTR; | |
826 | else | |
827 | ch->ch_mostat &= ~(UART_MCR_DTR); | |
828 | } | |
829 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
830 | } | |
831 | ||
832 | /* Parse any modem signal changes */ | |
669fef46 JP |
833 | jsm_dbg(INTR, &ch->ch_bd->pci_dev, |
834 | "MOD_STAT: sending to parse_modem_sigs\n"); | |
1da177e4 LT |
835 | neo_parse_modem(ch, readb(&ch->ch_neo_uart->msr)); |
836 | } | |
837 | } | |
838 | ||
839 | static inline void neo_parse_lsr(struct jsm_board *brd, u32 port) | |
840 | { | |
841 | struct jsm_channel *ch; | |
842 | int linestatus; | |
843 | unsigned long lock_flags; | |
844 | ||
845 | if (!brd) | |
846 | return; | |
847 | ||
848 | if (port > brd->maxports) | |
849 | return; | |
850 | ||
851 | ch = brd->channels[port]; | |
852 | if (!ch) | |
853 | return; | |
854 | ||
855 | linestatus = readb(&ch->ch_neo_uart->lsr); | |
856 | ||
669fef46 JP |
857 | jsm_dbg(INTR, &ch->ch_bd->pci_dev, "%s:%d port: %d linestatus: %x\n", |
858 | __FILE__, __LINE__, port, linestatus); | |
1da177e4 LT |
859 | |
860 | ch->ch_cached_lsr |= linestatus; | |
861 | ||
862 | if (ch->ch_cached_lsr & UART_LSR_DR) { | |
863 | /* Read data from uart -> queue */ | |
864 | neo_copy_data_from_uart_to_queue(ch); | |
865 | spin_lock_irqsave(&ch->ch_lock, lock_flags); | |
866 | jsm_check_queue_flow_control(ch); | |
867 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
868 | } | |
869 | ||
870 | /* | |
871 | * This is a special flag. It indicates that at least 1 | |
872 | * RX error (parity, framing, or break) has happened. | |
873 | * Mark this in our struct, which will tell me that I have | |
874 | *to do the special RX+LSR read for this FIFO load. | |
875 | */ | |
876 | if (linestatus & UART_17158_RX_FIFO_DATA_ERROR) | |
669fef46 | 877 | jsm_dbg(INTR, &ch->ch_bd->pci_dev, |
1da177e4 LT |
878 | "%s:%d Port: %d Got an RX error, need to parse LSR\n", |
879 | __FILE__, __LINE__, port); | |
880 | ||
881 | /* | |
882 | * The next 3 tests should *NOT* happen, as the above test | |
883 | * should encapsulate all 3... At least, thats what Exar says. | |
884 | */ | |
885 | ||
886 | if (linestatus & UART_LSR_PE) { | |
887 | ch->ch_err_parity++; | |
669fef46 JP |
888 | jsm_dbg(INTR, &ch->ch_bd->pci_dev, "%s:%d Port: %d. PAR ERR!\n", |
889 | __FILE__, __LINE__, port); | |
1da177e4 LT |
890 | } |
891 | ||
892 | if (linestatus & UART_LSR_FE) { | |
893 | ch->ch_err_frame++; | |
669fef46 JP |
894 | jsm_dbg(INTR, &ch->ch_bd->pci_dev, "%s:%d Port: %d. FRM ERR!\n", |
895 | __FILE__, __LINE__, port); | |
1da177e4 LT |
896 | } |
897 | ||
898 | if (linestatus & UART_LSR_BI) { | |
899 | ch->ch_err_break++; | |
669fef46 JP |
900 | jsm_dbg(INTR, &ch->ch_bd->pci_dev, |
901 | "%s:%d Port: %d. BRK INTR!\n", | |
902 | __FILE__, __LINE__, port); | |
1da177e4 LT |
903 | } |
904 | ||
905 | if (linestatus & UART_LSR_OE) { | |
906 | /* | |
907 | * Rx Oruns. Exar says that an orun will NOT corrupt | |
908 | * the FIFO. It will just replace the holding register | |
909 | * with this new data byte. So basically just ignore this. | |
910 | * Probably we should eventually have an orun stat in our driver... | |
911 | */ | |
912 | ch->ch_err_overrun++; | |
669fef46 JP |
913 | jsm_dbg(INTR, &ch->ch_bd->pci_dev, |
914 | "%s:%d Port: %d. Rx Overrun!\n", | |
915 | __FILE__, __LINE__, port); | |
1da177e4 LT |
916 | } |
917 | ||
918 | if (linestatus & UART_LSR_THRE) { | |
919 | spin_lock_irqsave(&ch->ch_lock, lock_flags); | |
920 | ch->ch_flags |= (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM); | |
921 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
922 | ||
923 | /* Transfer data (if any) from Write Queue -> UART. */ | |
924 | neo_copy_data_from_queue_to_uart(ch); | |
925 | } | |
926 | else if (linestatus & UART_17158_TX_AND_FIFO_CLR) { | |
927 | spin_lock_irqsave(&ch->ch_lock, lock_flags); | |
928 | ch->ch_flags |= (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM); | |
929 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); | |
930 | ||
931 | /* Transfer data (if any) from Write Queue -> UART. */ | |
932 | neo_copy_data_from_queue_to_uart(ch); | |
933 | } | |
934 | } | |
935 | ||
936 | /* | |
937 | * neo_param() | |
938 | * Send any/all changes to the line to the UART. | |
939 | */ | |
940 | static void neo_param(struct jsm_channel *ch) | |
941 | { | |
942 | u8 lcr = 0; | |
8e7d91c9 BL |
943 | u8 uart_lcr, ier; |
944 | u32 baud; | |
945 | int quot; | |
1da177e4 LT |
946 | struct jsm_board *bd; |
947 | ||
948 | bd = ch->ch_bd; | |
949 | if (!bd) | |
950 | return; | |
951 | ||
952 | /* | |
953 | * If baud rate is zero, flush queues, and set mval to drop DTR. | |
954 | */ | |
955 | if ((ch->ch_c_cflag & (CBAUD)) == 0) { | |
956 | ch->ch_r_head = ch->ch_r_tail = 0; | |
957 | ch->ch_e_head = ch->ch_e_tail = 0; | |
1da177e4 LT |
958 | |
959 | neo_flush_uart_write(ch); | |
960 | neo_flush_uart_read(ch); | |
961 | ||
962 | ch->ch_flags |= (CH_BAUD0); | |
963 | ch->ch_mostat &= ~(UART_MCR_RTS | UART_MCR_DTR); | |
964 | neo_assert_modem_signals(ch); | |
1da177e4 LT |
965 | return; |
966 | ||
bb3c190e AK |
967 | } else { |
968 | int i; | |
969 | unsigned int cflag; | |
970 | static struct { | |
971 | unsigned int rate; | |
972 | unsigned int cflag; | |
973 | } baud_rates[] = { | |
974 | { 921600, B921600 }, | |
975 | { 460800, B460800 }, | |
976 | { 230400, B230400 }, | |
977 | { 115200, B115200 }, | |
978 | { 57600, B57600 }, | |
979 | { 38400, B38400 }, | |
980 | { 19200, B19200 }, | |
981 | { 9600, B9600 }, | |
982 | { 4800, B4800 }, | |
983 | { 2400, B2400 }, | |
984 | { 1200, B1200 }, | |
985 | { 600, B600 }, | |
986 | { 300, B300 }, | |
987 | { 200, B200 }, | |
988 | { 150, B150 }, | |
989 | { 134, B134 }, | |
990 | { 110, B110 }, | |
991 | { 75, B75 }, | |
992 | { 50, B50 }, | |
993 | }; | |
994 | ||
ebd2c8f6 | 995 | cflag = C_BAUD(ch->uart_port.state->port.tty); |
bb3c190e AK |
996 | baud = 9600; |
997 | for (i = 0; i < ARRAY_SIZE(baud_rates); i++) { | |
998 | if (baud_rates[i].cflag == cflag) { | |
999 | baud = baud_rates[i].rate; | |
1000 | break; | |
1da177e4 | 1001 | } |
1da177e4 LT |
1002 | } |
1003 | ||
bb3c190e AK |
1004 | if (ch->ch_flags & CH_BAUD0) |
1005 | ch->ch_flags &= ~(CH_BAUD0); | |
1006 | } | |
1007 | ||
1da177e4 LT |
1008 | if (ch->ch_c_cflag & PARENB) |
1009 | lcr |= UART_LCR_PARITY; | |
1010 | ||
1011 | if (!(ch->ch_c_cflag & PARODD)) | |
1012 | lcr |= UART_LCR_EPAR; | |
1013 | ||
1014 | /* | |
1015 | * Not all platforms support mark/space parity, | |
1016 | * so this will hide behind an ifdef. | |
1017 | */ | |
1018 | #ifdef CMSPAR | |
1019 | if (ch->ch_c_cflag & CMSPAR) | |
1020 | lcr |= UART_LCR_SPAR; | |
1021 | #endif | |
1022 | ||
1023 | if (ch->ch_c_cflag & CSTOPB) | |
1024 | lcr |= UART_LCR_STOP; | |
1025 | ||
1026 | switch (ch->ch_c_cflag & CSIZE) { | |
1027 | case CS5: | |
1028 | lcr |= UART_LCR_WLEN5; | |
1029 | break; | |
1030 | case CS6: | |
1031 | lcr |= UART_LCR_WLEN6; | |
1032 | break; | |
1033 | case CS7: | |
1034 | lcr |= UART_LCR_WLEN7; | |
1035 | break; | |
1036 | case CS8: | |
1037 | default: | |
1038 | lcr |= UART_LCR_WLEN8; | |
1039 | break; | |
1040 | } | |
1041 | ||
1042 | ier = readb(&ch->ch_neo_uart->ier); | |
1043 | uart_lcr = readb(&ch->ch_neo_uart->lcr); | |
1044 | ||
1045 | if (baud == 0) | |
1046 | baud = 9600; | |
1047 | ||
1048 | quot = ch->ch_bd->bd_dividend / baud; | |
1049 | ||
1050 | if (quot != 0) { | |
1da177e4 LT |
1051 | writeb(UART_LCR_DLAB, &ch->ch_neo_uart->lcr); |
1052 | writeb((quot & 0xff), &ch->ch_neo_uart->txrx); | |
1053 | writeb((quot >> 8), &ch->ch_neo_uart->ier); | |
1054 | writeb(lcr, &ch->ch_neo_uart->lcr); | |
1055 | } | |
1056 | ||
1057 | if (uart_lcr != lcr) | |
1058 | writeb(lcr, &ch->ch_neo_uart->lcr); | |
1059 | ||
1060 | if (ch->ch_c_cflag & CREAD) | |
1061 | ier |= (UART_IER_RDI | UART_IER_RLSI); | |
1062 | ||
1063 | ier |= (UART_IER_THRI | UART_IER_MSI); | |
1064 | ||
1065 | writeb(ier, &ch->ch_neo_uart->ier); | |
1066 | ||
1067 | /* Set new start/stop chars */ | |
1068 | neo_set_new_start_stop_chars(ch); | |
1069 | ||
1070 | if (ch->ch_c_cflag & CRTSCTS) | |
1071 | neo_set_cts_flow_control(ch); | |
1072 | else if (ch->ch_c_iflag & IXON) { | |
1073 | /* If start/stop is set to disable, then we should disable flow control */ | |
1074 | if ((ch->ch_startc == __DISABLED_CHAR) || (ch->ch_stopc == __DISABLED_CHAR)) | |
1075 | neo_set_no_output_flow_control(ch); | |
1076 | else | |
1077 | neo_set_ixon_flow_control(ch); | |
1078 | } | |
1079 | else | |
1080 | neo_set_no_output_flow_control(ch); | |
1081 | ||
1082 | if (ch->ch_c_cflag & CRTSCTS) | |
1083 | neo_set_rts_flow_control(ch); | |
1084 | else if (ch->ch_c_iflag & IXOFF) { | |
1085 | /* If start/stop is set to disable, then we should disable flow control */ | |
1086 | if ((ch->ch_startc == __DISABLED_CHAR) || (ch->ch_stopc == __DISABLED_CHAR)) | |
1087 | neo_set_no_input_flow_control(ch); | |
1088 | else | |
1089 | neo_set_ixoff_flow_control(ch); | |
1090 | } | |
1091 | else | |
1092 | neo_set_no_input_flow_control(ch); | |
1093 | /* | |
1094 | * Adjust the RX FIFO Trigger level if baud is less than 9600. | |
1095 | * Not exactly elegant, but this is needed because of the Exar chip's | |
1096 | * delay on firing off the RX FIFO interrupt on slower baud rates. | |
1097 | */ | |
1098 | if (baud < 9600) { | |
1099 | writeb(1, &ch->ch_neo_uart->rfifo); | |
1100 | ch->ch_r_tlevel = 1; | |
1101 | } | |
1102 | ||
1103 | neo_assert_modem_signals(ch); | |
1104 | ||
1105 | /* Get current status of the modem signals now */ | |
1106 | neo_parse_modem(ch, readb(&ch->ch_neo_uart->msr)); | |
1107 | return; | |
1108 | } | |
1109 | ||
1110 | /* | |
1111 | * jsm_neo_intr() | |
1112 | * | |
1113 | * Neo specific interrupt handler. | |
1114 | */ | |
7d12e780 | 1115 | static irqreturn_t neo_intr(int irq, void *voidbrd) |
1da177e4 | 1116 | { |
c7bec5ab | 1117 | struct jsm_board *brd = voidbrd; |
1da177e4 LT |
1118 | struct jsm_channel *ch; |
1119 | int port = 0; | |
1120 | int type = 0; | |
1121 | int current_port; | |
1122 | u32 tmp; | |
1123 | u32 uart_poll; | |
1124 | unsigned long lock_flags; | |
1125 | unsigned long lock_flags2; | |
1126 | int outofloop_count = 0; | |
1127 | ||
1da177e4 LT |
1128 | /* Lock out the slow poller from running on this board. */ |
1129 | spin_lock_irqsave(&brd->bd_intr_lock, lock_flags); | |
1130 | ||
1131 | /* | |
1132 | * Read in "extended" IRQ information from the 32bit Neo register. | |
1133 | * Bits 0-7: What port triggered the interrupt. | |
1134 | * Bits 8-31: Each 3bits indicate what type of interrupt occurred. | |
1135 | */ | |
1136 | uart_poll = readl(brd->re_map_membase + UART_17158_POLL_ADDR_OFFSET); | |
1137 | ||
669fef46 JP |
1138 | jsm_dbg(INTR, &brd->pci_dev, "%s:%d uart_poll: %x\n", |
1139 | __FILE__, __LINE__, uart_poll); | |
1da177e4 LT |
1140 | |
1141 | if (!uart_poll) { | |
669fef46 | 1142 | jsm_dbg(INTR, &brd->pci_dev, |
1da177e4 LT |
1143 | "Kernel interrupted to me, but no pending interrupts...\n"); |
1144 | spin_unlock_irqrestore(&brd->bd_intr_lock, lock_flags); | |
1145 | return IRQ_NONE; | |
1146 | } | |
1147 | ||
1148 | /* At this point, we have at least SOMETHING to service, dig further... */ | |
1149 | ||
1150 | current_port = 0; | |
1151 | ||
1152 | /* Loop on each port */ | |
1153 | while (((uart_poll & 0xff) != 0) && (outofloop_count < 0xff)){ | |
1154 | ||
1155 | tmp = uart_poll; | |
1156 | outofloop_count++; | |
1157 | ||
1158 | /* Check current port to see if it has interrupt pending */ | |
1159 | if ((tmp & jsm_offset_table[current_port]) != 0) { | |
1160 | port = current_port; | |
1161 | type = tmp >> (8 + (port * 3)); | |
1162 | type &= 0x7; | |
1163 | } else { | |
1164 | current_port++; | |
1165 | continue; | |
1166 | } | |
1167 | ||
669fef46 JP |
1168 | jsm_dbg(INTR, &brd->pci_dev, "%s:%d port: %x type: %x\n", |
1169 | __FILE__, __LINE__, port, type); | |
1da177e4 LT |
1170 | |
1171 | /* Remove this port + type from uart_poll */ | |
1172 | uart_poll &= ~(jsm_offset_table[port]); | |
1173 | ||
1174 | if (!type) { | |
1175 | /* If no type, just ignore it, and move onto next port */ | |
669fef46 | 1176 | jsm_dbg(INTR, &brd->pci_dev, |
1da177e4 LT |
1177 | "Interrupt with no type! port: %d\n", port); |
1178 | continue; | |
1179 | } | |
1180 | ||
1181 | /* Switch on type of interrupt we have */ | |
1182 | switch (type) { | |
1183 | ||
1184 | case UART_17158_RXRDY_TIMEOUT: | |
1185 | /* | |
1186 | * RXRDY Time-out is cleared by reading data in the | |
1187 | * RX FIFO until it falls below the trigger level. | |
1188 | */ | |
1189 | ||
1190 | /* Verify the port is in range. */ | |
1191 | if (port > brd->nasync) | |
1192 | continue; | |
1193 | ||
1194 | ch = brd->channels[port]; | |
1195 | neo_copy_data_from_uart_to_queue(ch); | |
1196 | ||
1197 | /* Call our tty layer to enforce queue flow control if needed. */ | |
1198 | spin_lock_irqsave(&ch->ch_lock, lock_flags2); | |
1199 | jsm_check_queue_flow_control(ch); | |
1200 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags2); | |
1201 | ||
1202 | continue; | |
1203 | ||
1204 | case UART_17158_RX_LINE_STATUS: | |
1205 | /* | |
1206 | * RXRDY and RX LINE Status (logic OR of LSR[4:1]) | |
1207 | */ | |
1208 | neo_parse_lsr(brd, port); | |
1209 | continue; | |
1210 | ||
1211 | case UART_17158_TXRDY: | |
1212 | /* | |
1213 | * TXRDY interrupt clears after reading ISR register for the UART channel. | |
1214 | */ | |
1215 | ||
1216 | /* | |
1217 | * Yes, this is odd... | |
1218 | * Why would I check EVERY possibility of type of | |
1219 | * interrupt, when we know its TXRDY??? | |
1220 | * Becuz for some reason, even tho we got triggered for TXRDY, | |
25985edc | 1221 | * it seems to be occasionally wrong. Instead of TX, which |
1da177e4 LT |
1222 | * it should be, I was getting things like RXDY too. Weird. |
1223 | */ | |
1224 | neo_parse_isr(brd, port); | |
1225 | continue; | |
1226 | ||
1227 | case UART_17158_MSR: | |
1228 | /* | |
1229 | * MSR or flow control was seen. | |
1230 | */ | |
1231 | neo_parse_isr(brd, port); | |
1232 | continue; | |
1233 | ||
1234 | default: | |
1235 | /* | |
1236 | * The UART triggered us with a bogus interrupt type. | |
1237 | * It appears the Exar chip, when REALLY bogged down, will throw | |
1238 | * these once and awhile. | |
1239 | * Its harmless, just ignore it and move on. | |
1240 | */ | |
669fef46 JP |
1241 | jsm_dbg(INTR, &brd->pci_dev, |
1242 | "%s:%d Unknown Interrupt type: %x\n", | |
1243 | __FILE__, __LINE__, type); | |
1da177e4 LT |
1244 | continue; |
1245 | } | |
1246 | } | |
1247 | ||
1248 | spin_unlock_irqrestore(&brd->bd_intr_lock, lock_flags); | |
1249 | ||
669fef46 | 1250 | jsm_dbg(INTR, &brd->pci_dev, "finish\n"); |
1da177e4 LT |
1251 | return IRQ_HANDLED; |
1252 | } | |
1253 | ||
1254 | /* | |
1255 | * Neo specific way of turning off the receiver. | |
1256 | * Used as a way to enforce queue flow control when in | |
1257 | * hardware flow control mode. | |
1258 | */ | |
1259 | static void neo_disable_receiver(struct jsm_channel *ch) | |
1260 | { | |
1261 | u8 tmp = readb(&ch->ch_neo_uart->ier); | |
1262 | tmp &= ~(UART_IER_RDI); | |
1263 | writeb(tmp, &ch->ch_neo_uart->ier); | |
1264 | ||
1265 | /* flush write operation */ | |
1266 | neo_pci_posting_flush(ch->ch_bd); | |
1267 | } | |
1268 | ||
1269 | ||
1270 | /* | |
1271 | * Neo specific way of turning on the receiver. | |
1272 | * Used as a way to un-enforce queue flow control when in | |
1273 | * hardware flow control mode. | |
1274 | */ | |
1275 | static void neo_enable_receiver(struct jsm_channel *ch) | |
1276 | { | |
1277 | u8 tmp = readb(&ch->ch_neo_uart->ier); | |
1278 | tmp |= (UART_IER_RDI); | |
1279 | writeb(tmp, &ch->ch_neo_uart->ier); | |
1280 | ||
1281 | /* flush write operation */ | |
1282 | neo_pci_posting_flush(ch->ch_bd); | |
1283 | } | |
1284 | ||
1285 | static void neo_send_start_character(struct jsm_channel *ch) | |
1286 | { | |
1287 | if (!ch) | |
1288 | return; | |
1289 | ||
1290 | if (ch->ch_startc != __DISABLED_CHAR) { | |
1291 | ch->ch_xon_sends++; | |
1292 | writeb(ch->ch_startc, &ch->ch_neo_uart->txrx); | |
1293 | ||
1294 | /* flush write operation */ | |
1295 | neo_pci_posting_flush(ch->ch_bd); | |
1296 | } | |
1297 | } | |
1298 | ||
1299 | static void neo_send_stop_character(struct jsm_channel *ch) | |
1300 | { | |
1301 | if (!ch) | |
1302 | return; | |
1303 | ||
1304 | if (ch->ch_stopc != __DISABLED_CHAR) { | |
1305 | ch->ch_xoff_sends++; | |
1306 | writeb(ch->ch_stopc, &ch->ch_neo_uart->txrx); | |
1307 | ||
1308 | /* flush write operation */ | |
1309 | neo_pci_posting_flush(ch->ch_bd); | |
1310 | } | |
1311 | } | |
1312 | ||
1313 | /* | |
1314 | * neo_uart_init | |
1315 | */ | |
1316 | static void neo_uart_init(struct jsm_channel *ch) | |
1317 | { | |
1318 | writeb(0, &ch->ch_neo_uart->ier); | |
1319 | writeb(0, &ch->ch_neo_uart->efr); | |
1320 | writeb(UART_EFR_ECB, &ch->ch_neo_uart->efr); | |
1321 | ||
1322 | /* Clear out UART and FIFO */ | |
1323 | readb(&ch->ch_neo_uart->txrx); | |
1324 | writeb((UART_FCR_ENABLE_FIFO|UART_FCR_CLEAR_RCVR|UART_FCR_CLEAR_XMIT), &ch->ch_neo_uart->isr_fcr); | |
1325 | readb(&ch->ch_neo_uart->lsr); | |
1326 | readb(&ch->ch_neo_uart->msr); | |
1327 | ||
1328 | ch->ch_flags |= CH_FIFO_ENABLED; | |
1329 | ||
1330 | /* Assert any signals we want up */ | |
1331 | writeb(ch->ch_mostat, &ch->ch_neo_uart->mcr); | |
1332 | } | |
1333 | ||
1334 | /* | |
1335 | * Make the UART completely turn off. | |
1336 | */ | |
1337 | static void neo_uart_off(struct jsm_channel *ch) | |
1338 | { | |
1339 | /* Turn off UART enhanced bits */ | |
1340 | writeb(0, &ch->ch_neo_uart->efr); | |
1341 | ||
1342 | /* Stop all interrupts from occurring. */ | |
1343 | writeb(0, &ch->ch_neo_uart->ier); | |
1344 | } | |
1345 | ||
1346 | static u32 neo_get_uart_bytes_left(struct jsm_channel *ch) | |
1347 | { | |
1348 | u8 left = 0; | |
1349 | u8 lsr = readb(&ch->ch_neo_uart->lsr); | |
1350 | ||
1351 | /* We must cache the LSR as some of the bits get reset once read... */ | |
1352 | ch->ch_cached_lsr |= lsr; | |
1353 | ||
1354 | /* Determine whether the Transmitter is empty or not */ | |
1355 | if (!(lsr & UART_LSR_TEMT)) | |
1356 | left = 1; | |
1357 | else { | |
1358 | ch->ch_flags |= (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM); | |
1359 | left = 0; | |
1360 | } | |
1361 | ||
1362 | return left; | |
1363 | } | |
1364 | ||
1365 | /* Channel lock MUST be held by the calling function! */ | |
1366 | static void neo_send_break(struct jsm_channel *ch) | |
1367 | { | |
1368 | /* | |
1369 | * Set the time we should stop sending the break. | |
1370 | * If we are already sending a break, toss away the existing | |
1371 | * time to stop, and use this new value instead. | |
1372 | */ | |
1373 | ||
1374 | /* Tell the UART to start sending the break */ | |
1375 | if (!(ch->ch_flags & CH_BREAK_SENDING)) { | |
1376 | u8 temp = readb(&ch->ch_neo_uart->lcr); | |
1377 | writeb((temp | UART_LCR_SBC), &ch->ch_neo_uart->lcr); | |
1378 | ch->ch_flags |= (CH_BREAK_SENDING); | |
1379 | ||
1380 | /* flush write operation */ | |
1381 | neo_pci_posting_flush(ch->ch_bd); | |
1382 | } | |
1383 | } | |
1384 | ||
1385 | /* | |
1386 | * neo_send_immediate_char. | |
1387 | * | |
1388 | * Sends a specific character as soon as possible to the UART, | |
1389 | * jumping over any bytes that might be in the write queue. | |
1390 | * | |
1391 | * The channel lock MUST be held by the calling function. | |
1392 | */ | |
1393 | static void neo_send_immediate_char(struct jsm_channel *ch, unsigned char c) | |
1394 | { | |
1395 | if (!ch) | |
1396 | return; | |
1397 | ||
1398 | writeb(c, &ch->ch_neo_uart->txrx); | |
1399 | ||
1400 | /* flush write operation */ | |
1401 | neo_pci_posting_flush(ch->ch_bd); | |
1402 | } | |
1403 | ||
1404 | struct board_ops jsm_neo_ops = { | |
1405 | .intr = neo_intr, | |
1406 | .uart_init = neo_uart_init, | |
1407 | .uart_off = neo_uart_off, | |
1408 | .param = neo_param, | |
1409 | .assert_modem_signals = neo_assert_modem_signals, | |
1410 | .flush_uart_write = neo_flush_uart_write, | |
1411 | .flush_uart_read = neo_flush_uart_read, | |
1412 | .disable_receiver = neo_disable_receiver, | |
1413 | .enable_receiver = neo_enable_receiver, | |
1414 | .send_break = neo_send_break, | |
1415 | .clear_break = neo_clear_break, | |
1416 | .send_start_character = neo_send_start_character, | |
1417 | .send_stop_character = neo_send_stop_character, | |
1418 | .copy_data_from_queue_to_uart = neo_copy_data_from_queue_to_uart, | |
1419 | .get_uart_bytes_left = neo_get_uart_bytes_left, | |
1420 | .send_immediate_char = neo_send_immediate_char | |
1421 | }; |