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c906108c SS |
1 | /* This file is part of the program GDB, the GNU debugger. |
2 | ||
e4d013fc | 3 | Copyright (C) 1998, 1999, 2007, 2008, 2009 Free Software Foundation, Inc. |
c906108c SS |
4 | Contributed by Cygnus Solutions. |
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 | |
4744ac1b | 8 | the Free Software Foundation; either version 3 of the License, or |
c906108c | 9 | (at your option) any later version. |
4744ac1b | 10 | |
c906108c SS |
11 | This program is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
4744ac1b | 15 | |
c906108c | 16 | You should have received a copy of the GNU General Public License |
4744ac1b | 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
c906108c SS |
18 | |
19 | */ | |
20 | ||
21 | ||
22 | #include "sim-main.h" | |
23 | #include "hw-main.h" | |
24 | #include "dv-sockser.h" | |
25 | #include "sim-assert.h" | |
26 | ||
27 | ||
28 | /* DEVICE | |
29 | ||
30 | ||
31 | tx3904sio - tx3904 serial I/O | |
32 | ||
33 | ||
34 | DESCRIPTION | |
35 | ||
36 | ||
37 | Implements one tx3904 serial I/O controller described in the tx3904 | |
38 | user guide. Three instances are required for SIO0 and SIO1 within | |
39 | the tx3904, at different base addresses. | |
40 | ||
41 | Both internal and system clocks are synthesized as divided versions | |
42 | of the simulator clock. | |
43 | ||
44 | There is no support for: | |
45 | - CTS/RTS flow control | |
46 | - baud rate emulation - use infinite speed instead | |
47 | - general frame format - use 8N1 | |
48 | - multi-controller system | |
49 | - DMA - use interrupt-driven or polled-I/O instead | |
50 | ||
51 | ||
52 | PROPERTIES | |
53 | ||
54 | ||
55 | reg <base> <length> | |
56 | ||
57 | Base of SIO control register bank. <length> must equal 0x100. | |
58 | Register offsets: 0: SLCR: line control register | |
59 | 4: SLSR: line status register | |
60 | 8: SDICR: DMA/interrupt control register | |
61 | 12: SDISR: DMA/interrupt status register | |
62 | 16: SFCR: FIFO control register | |
63 | 20: SBGR: baud rate control register | |
64 | 32: transfer FIFO buffer | |
65 | 48: transfer FIFO buffer | |
66 | ||
67 | backend {tcp | stdio} | |
68 | ||
69 | Use dv-sockser TCP-port backend or stdio for backend. Default: stdio. | |
70 | ||
71 | ||
72 | ||
73 | PORTS | |
74 | ||
75 | ||
76 | int (output) | |
77 | ||
78 | Interrupt port. An event is generated when a timer interrupt | |
79 | occurs. | |
80 | ||
81 | ||
82 | reset (input) | |
83 | ||
84 | Reset port. | |
85 | ||
86 | */ | |
87 | ||
88 | ||
89 | ||
90 | /* static functions */ | |
91 | ||
92 | struct tx3904sio_fifo; | |
93 | ||
94 | static void tx3904sio_tickle(struct hw*); | |
95 | static int tx3904sio_fifo_nonempty(struct hw*, struct tx3904sio_fifo*); | |
96 | static char tx3904sio_fifo_pop(struct hw*, struct tx3904sio_fifo*); | |
97 | static void tx3904sio_fifo_push(struct hw*, struct tx3904sio_fifo*, char); | |
98 | static void tx3904sio_fifo_reset(struct hw*, struct tx3904sio_fifo*); | |
99 | static void tx3904sio_poll(struct hw*, void* data); | |
100 | ||
101 | ||
102 | /* register numbers; each is one word long */ | |
103 | enum | |
104 | { | |
105 | SLCR_REG = 0, | |
106 | SLSR_REG = 1, | |
107 | SDICR_REG = 2, | |
108 | SDISR_REG = 3, | |
109 | SFCR_REG = 4, | |
110 | SBGR_REG = 5, | |
111 | TFIFO_REG = 8, | |
112 | SFIFO_REG = 12, | |
113 | }; | |
114 | ||
115 | ||
116 | ||
117 | /* port ID's */ | |
118 | ||
119 | enum | |
120 | { | |
121 | RESET_PORT, | |
122 | INT_PORT, | |
123 | }; | |
124 | ||
125 | ||
126 | static const struct hw_port_descriptor tx3904sio_ports[] = | |
127 | { | |
128 | { "int", INT_PORT, 0, output_port, }, | |
129 | { "reset", RESET_PORT, 0, input_port, }, | |
130 | { NULL, }, | |
131 | }; | |
132 | ||
133 | ||
134 | ||
135 | /* Generic FIFO */ | |
136 | struct tx3904sio_fifo | |
137 | { | |
138 | int size, used; | |
139 | unsigned_1 *buffer; | |
140 | }; | |
141 | ||
142 | ||
143 | ||
144 | /* The timer/counter register internal state. Note that we store | |
145 | state using the control register images, in host endian order. */ | |
146 | ||
147 | struct tx3904sio | |
148 | { | |
149 | address_word base_address; /* control register base */ | |
150 | enum {sio_tcp, sio_stdio} backend; /* backend */ | |
151 | ||
152 | struct tx3904sio_fifo rx_fifo, tx_fifo; /* FIFOs */ | |
153 | ||
154 | unsigned_4 slcr; | |
155 | #define SLCR_WR_MASK 0xe17f0000U | |
156 | #define SLCR_SET_BYTE(c,o,b) ((c)->slcr = SLCR_WR_MASK & (((c)->slcr & ~LSMASK32((o)*8+7,(o)*8)) | ((b)<< (o)*8))) | |
157 | unsigned_4 slsr; | |
158 | #define SLSR_WR_MASK 0x00000000 /* UFER/UPER/UOER unimplemented */ | |
159 | unsigned_4 sdicr; | |
160 | #define SDICR_WR_MASK 0x000f0000U | |
161 | #define SDICR_SET_BYTE(c,o,b) ((c)->sdicr = SDICR_WR_MASK & (((c)->sdicr & ~LSMASK32((o)*8+7,(o)*8)) | ((b)<< (o)*8))) | |
162 | #define SDICR_GET_SDMAE(c) ((c)->sdicr & 0x00080000) | |
163 | #define SDICR_GET_ERIE(c) ((c)->sdicr & 0x00040000) | |
164 | #define SDICR_GET_TDIE(c) ((c)->sdicr & 0x00020000) | |
165 | #define SDICR_GET_RDIE(c) ((c)->sdicr & 0x00010000) | |
166 | unsigned_4 sdisr; | |
167 | #define SDISR_WR_MASK 0x00070000U | |
168 | #define SDISR_SET_BYTE(c,o,b) ((c)->sdisr = SDISR_WR_MASK & (((c)->sdisr & ~LSMASK32((o)*8+7,(o)*8)) | ((b)<< (o)*8))) | |
c2d11a7d | 169 | #define SDISR_CLEAR_FLAG_BYTE(c,o,b) ((c)->sdisr = SDISR_WR_MASK & (((c)->sdisr & ~LSMASK32((o)*8+7,(o)*8)) & ((b)<< (o)*8))) |
c906108c SS |
170 | #define SDISR_GET_TDIS(c) ((c)->sdisr & 0x00020000) |
171 | #define SDISR_SET_TDIS(c) ((c)->sdisr |= 0x00020000) | |
172 | #define SDISR_GET_RDIS(c) ((c)->sdisr & 0x00010000) | |
173 | #define SDISR_SET_RDIS(c) ((c)->sdisr |= 0x00010000) | |
174 | unsigned_4 sfcr; | |
175 | #define SFCR_WR_MASK 0x001f0000U | |
176 | #define SFCR_SET_BYTE(c,o,b) ((c)->sfcr = SFCR_WR_MASK & (((c)->sfcr & ~LSMASK32((o)*8+7,(o)*8)) | ((b)<< (o)*8))) | |
177 | #define SFCR_GET_TFRST(c) ((c)->sfcr & 0x00040000) | |
178 | #define SFCR_GET_RFRST(c) ((c)->sfcr & 0x00020000) | |
179 | #define SFCR_GET_FRSTE(c) ((c)->sfcr & 0x00010000) | |
180 | unsigned_4 sbgr; | |
181 | #define SBGR_WR_MASK 0x03ff0000U | |
182 | #define SBGR_SET_BYTE(c,o,b) ((c)->sbgr = SBGR_WR_MASK & (((c)->sbgr & ~LSMASK32((o)*8+7,(o)*8)) | ((b)<< (o)*8))) | |
183 | ||
184 | /* Periodic I/O polling */ | |
185 | struct hw_event* poll_event; | |
186 | }; | |
187 | ||
188 | ||
189 | ||
190 | /* Finish off the partially created hw device. Attach our local | |
191 | callbacks. Wire up our port names etc */ | |
192 | ||
193 | static hw_io_read_buffer_method tx3904sio_io_read_buffer; | |
194 | static hw_io_write_buffer_method tx3904sio_io_write_buffer; | |
195 | static hw_port_event_method tx3904sio_port_event; | |
196 | ||
197 | ||
198 | static void | |
199 | attach_tx3904sio_regs (struct hw *me, | |
200 | struct tx3904sio *controller) | |
201 | { | |
202 | unsigned_word attach_address; | |
203 | int attach_space; | |
204 | unsigned attach_size; | |
205 | reg_property_spec reg; | |
206 | ||
207 | if (hw_find_property (me, "reg") == NULL) | |
208 | hw_abort (me, "Missing \"reg\" property"); | |
209 | ||
210 | if (!hw_find_reg_array_property (me, "reg", 0, ®)) | |
211 | hw_abort (me, "\"reg\" property must contain one addr/size entry"); | |
212 | ||
213 | hw_unit_address_to_attach_address (hw_parent (me), | |
214 | ®.address, | |
215 | &attach_space, | |
216 | &attach_address, | |
217 | me); | |
218 | hw_unit_size_to_attach_size (hw_parent (me), | |
219 | ®.size, | |
220 | &attach_size, me); | |
221 | ||
222 | hw_attach_address (hw_parent (me), 0, | |
223 | attach_space, attach_address, attach_size, | |
224 | me); | |
225 | ||
226 | if(hw_find_property(me, "backend") != NULL) | |
227 | { | |
228 | const char* value = hw_find_string_property(me, "backend"); | |
229 | if(! strcmp(value, "tcp")) | |
230 | controller->backend = sio_tcp; | |
231 | else if(! strcmp(value, "stdio")) | |
232 | controller->backend = sio_stdio; | |
233 | else | |
234 | hw_abort(me, "illegal value for backend parameter `%s': use tcp or stdio", value); | |
235 | } | |
236 | ||
237 | controller->base_address = attach_address; | |
238 | } | |
239 | ||
240 | ||
241 | static void | |
242 | tx3904sio_finish (struct hw *me) | |
243 | { | |
244 | struct tx3904sio *controller; | |
245 | ||
246 | controller = HW_ZALLOC (me, struct tx3904sio); | |
247 | set_hw_data (me, controller); | |
248 | set_hw_io_read_buffer (me, tx3904sio_io_read_buffer); | |
249 | set_hw_io_write_buffer (me, tx3904sio_io_write_buffer); | |
250 | set_hw_ports (me, tx3904sio_ports); | |
251 | set_hw_port_event (me, tx3904sio_port_event); | |
252 | ||
253 | /* Preset defaults */ | |
254 | controller->backend = sio_stdio; | |
255 | ||
256 | /* Attach ourself to our parent bus */ | |
257 | attach_tx3904sio_regs (me, controller); | |
258 | ||
259 | /* Initialize to reset state */ | |
260 | tx3904sio_fifo_reset(me, & controller->rx_fifo); | |
261 | tx3904sio_fifo_reset(me, & controller->tx_fifo); | |
262 | controller->slsr = controller->sdicr | |
263 | = controller->sdisr = controller->sfcr | |
264 | = controller->sbgr = 0; | |
265 | controller->slcr = 0x40000000; /* set TWUB */ | |
266 | controller->sbgr = 0x03ff0000; /* set BCLK=3, BRD=FF */ | |
267 | controller->poll_event = NULL; | |
268 | } | |
269 | ||
270 | ||
271 | ||
272 | /* An event arrives on an interrupt port */ | |
273 | ||
274 | static void | |
275 | tx3904sio_port_event (struct hw *me, | |
276 | int my_port, | |
277 | struct hw *source, | |
278 | int source_port, | |
279 | int level) | |
280 | { | |
281 | struct tx3904sio *controller = hw_data (me); | |
282 | ||
283 | switch (my_port) | |
284 | { | |
285 | case RESET_PORT: | |
286 | { | |
287 | HW_TRACE ((me, "reset")); | |
288 | ||
289 | tx3904sio_fifo_reset(me, & controller->rx_fifo); | |
290 | tx3904sio_fifo_reset(me, & controller->tx_fifo); | |
291 | controller->slsr = controller->sdicr | |
292 | = controller->sdisr = controller->sfcr | |
293 | = controller->sbgr = 0; | |
294 | controller->slcr = 0x40000000; /* set TWUB */ | |
295 | controller->sbgr = 0x03ff0000; /* set BCLK=3, BRD=FF */ | |
296 | /* Don't interfere with I/O poller. */ | |
297 | break; | |
298 | } | |
299 | ||
300 | default: | |
301 | hw_abort (me, "Event on unknown port %d", my_port); | |
302 | break; | |
303 | } | |
304 | } | |
305 | ||
306 | ||
307 | /* generic read/write */ | |
308 | ||
309 | static unsigned | |
310 | tx3904sio_io_read_buffer (struct hw *me, | |
311 | void *dest, | |
312 | int space, | |
313 | unsigned_word base, | |
314 | unsigned nr_bytes) | |
315 | { | |
316 | struct tx3904sio *controller = hw_data (me); | |
317 | unsigned byte; | |
318 | ||
319 | HW_TRACE ((me, "read 0x%08lx %d", (long) base, (int) nr_bytes)); | |
320 | ||
321 | /* tickle fifos */ | |
322 | tx3904sio_tickle(me); | |
323 | ||
324 | for (byte = 0; byte < nr_bytes; byte++) | |
325 | { | |
326 | address_word address = base + byte; | |
327 | int reg_number = (address - controller->base_address) / 4; | |
328 | int reg_offset = (address - controller->base_address) % 4; | |
329 | unsigned_4 register_value; /* in target byte order */ | |
330 | ||
331 | /* fill in entire register_value word */ | |
332 | switch (reg_number) | |
333 | { | |
334 | case SLCR_REG: register_value = controller->slcr; break; | |
335 | case SLSR_REG: register_value = controller->slsr; break; | |
336 | case SDICR_REG: register_value = controller->sdicr; break; | |
337 | case SDISR_REG: register_value = controller->sdisr; break; | |
338 | case SFCR_REG: register_value = controller->sfcr; break; | |
339 | case SBGR_REG: register_value = controller->sbgr; break; | |
340 | case TFIFO_REG: register_value = 0; break; | |
341 | case SFIFO_REG: | |
342 | /* consume rx fifo for MS byte */ | |
343 | if(reg_offset == 0 && tx3904sio_fifo_nonempty(me, & controller->rx_fifo)) | |
344 | register_value = (tx3904sio_fifo_pop(me, & controller->rx_fifo) << 24); | |
345 | else | |
346 | register_value = 0; | |
347 | break; | |
348 | default: register_value = 0; | |
349 | } | |
350 | ||
351 | /* write requested byte out */ | |
352 | register_value = H2T_4(register_value); | |
353 | /* HW_TRACE ((me, "byte %d %02x", reg_offset, ((char*)& register_value)[reg_offset])); */ | |
354 | memcpy ((char*) dest + byte, ((char*)& register_value)+reg_offset, 1); | |
355 | } | |
356 | ||
357 | return nr_bytes; | |
358 | } | |
359 | ||
360 | ||
361 | ||
362 | static unsigned | |
363 | tx3904sio_io_write_buffer (struct hw *me, | |
364 | const void *source, | |
365 | int space, | |
366 | unsigned_word base, | |
367 | unsigned nr_bytes) | |
368 | { | |
369 | struct tx3904sio *controller = hw_data (me); | |
370 | unsigned byte; | |
371 | ||
372 | HW_TRACE ((me, "write 0x%08lx %d", (long) base, (int) nr_bytes)); | |
373 | for (byte = 0; byte < nr_bytes; byte++) | |
374 | { | |
375 | address_word address = base + byte; | |
376 | unsigned_1 write_byte = ((const unsigned char*) source)[byte]; | |
377 | int reg_number = (address - controller->base_address) / 4; | |
378 | int reg_offset = 3 - (address - controller->base_address) % 4; | |
379 | ||
380 | /* HW_TRACE ((me, "byte %d %02x", reg_offset, write_byte)); */ | |
381 | ||
382 | /* fill in entire register_value word */ | |
383 | switch (reg_number) | |
384 | { | |
385 | case SLCR_REG: | |
386 | SLCR_SET_BYTE(controller, reg_offset, write_byte); | |
387 | break; | |
388 | ||
389 | case SLSR_REG: /* unwriteable */ break; | |
390 | ||
391 | case SDICR_REG: | |
392 | { | |
393 | unsigned_4 last_int, next_int; | |
394 | ||
395 | /* deassert interrupt upon clear */ | |
396 | last_int = controller->sdisr & controller->sdicr; | |
397 | /* HW_TRACE ((me, "sdicr - sdisr %08x sdicr %08x", | |
398 | controller->sdisr, controller->sdicr)); */ | |
399 | SDICR_SET_BYTE(controller, reg_offset, write_byte); | |
400 | /* HW_TRACE ((me, "sdicr + sdisr %08x sdicr %08x", | |
401 | controller->sdisr, controller->sdicr)); */ | |
402 | next_int = controller->sdisr & controller->sdicr; | |
403 | ||
404 | if(SDICR_GET_SDMAE(controller)) | |
405 | hw_abort(me, "Cannot support DMA-driven sio."); | |
406 | ||
407 | if(~last_int & next_int) /* any bits set? */ | |
408 | hw_port_event(me, INT_PORT, 1); | |
409 | if(last_int & ~next_int) /* any bits cleared? */ | |
410 | hw_port_event(me, INT_PORT, 0); | |
411 | } | |
412 | break; | |
413 | ||
414 | case SDISR_REG: | |
415 | { | |
416 | unsigned_4 last_int, next_int; | |
417 | ||
418 | /* deassert interrupt upon clear */ | |
419 | last_int = controller->sdisr & controller->sdicr; | |
420 | /* HW_TRACE ((me, "sdisr - sdisr %08x sdicr %08x", | |
421 | controller->sdisr, controller->sdicr)); */ | |
c2d11a7d | 422 | SDISR_CLEAR_FLAG_BYTE(controller, reg_offset, write_byte); |
c906108c SS |
423 | /* HW_TRACE ((me, "sdisr + sdisr %08x sdicr %08x", |
424 | controller->sdisr, controller->sdicr)); */ | |
425 | next_int = controller->sdisr & controller->sdicr; | |
426 | ||
427 | if(~last_int & next_int) /* any bits set? */ | |
428 | hw_port_event(me, INT_PORT, 1); | |
429 | if(last_int & ~next_int) /* any bits cleared? */ | |
430 | hw_port_event(me, INT_PORT, 0); | |
431 | } | |
432 | break; | |
433 | ||
434 | case SFCR_REG: | |
435 | SFCR_SET_BYTE(controller, reg_offset, write_byte); | |
436 | if(SFCR_GET_FRSTE(controller)) | |
437 | { | |
438 | if(SFCR_GET_TFRST(controller)) tx3904sio_fifo_reset(me, & controller->tx_fifo); | |
439 | if(SFCR_GET_RFRST(controller)) tx3904sio_fifo_reset(me, & controller->rx_fifo); | |
440 | } | |
441 | break; | |
442 | ||
443 | case SBGR_REG: | |
444 | SBGR_SET_BYTE(controller, reg_offset, write_byte); | |
445 | break; | |
446 | ||
447 | case SFIFO_REG: /* unwriteable */ break; | |
448 | ||
449 | case TFIFO_REG: | |
450 | if(reg_offset == 3) /* first byte */ | |
451 | tx3904sio_fifo_push(me, & controller->tx_fifo, write_byte); | |
452 | break; | |
453 | ||
454 | default: | |
455 | HW_TRACE ((me, "write to illegal register %d", reg_number)); | |
456 | } | |
457 | } /* loop over bytes */ | |
458 | ||
459 | /* tickle fifos */ | |
460 | tx3904sio_tickle(me); | |
461 | ||
462 | return nr_bytes; | |
463 | } | |
464 | ||
465 | ||
466 | ||
467 | ||
468 | ||
469 | ||
470 | /* Send enqueued characters from tx_fifo and trigger TX interrupt. | |
471 | Receive characters into rx_fifo and trigger RX interrupt. */ | |
472 | void | |
473 | tx3904sio_tickle(struct hw *me) | |
474 | { | |
475 | struct tx3904sio* controller = hw_data(me); | |
476 | int c; | |
477 | char cc; | |
478 | unsigned_4 last_int, next_int; | |
479 | ||
480 | /* HW_TRACE ((me, "tickle backend: %02x", controller->backend)); */ | |
481 | switch(controller->backend) | |
482 | { | |
483 | case sio_tcp: | |
484 | ||
485 | while(tx3904sio_fifo_nonempty(me, & controller->tx_fifo)) | |
486 | { | |
487 | cc = tx3904sio_fifo_pop(me, & controller->tx_fifo); | |
488 | dv_sockser_write(hw_system(me), cc); | |
489 | HW_TRACE ((me, "tcp output: %02x", cc)); | |
490 | } | |
491 | ||
492 | c = dv_sockser_read(hw_system(me)); | |
493 | while(c != -1) | |
494 | { | |
495 | cc = (char) c; | |
496 | HW_TRACE ((me, "tcp input: %02x", cc)); | |
497 | tx3904sio_fifo_push(me, & controller->rx_fifo, cc); | |
498 | c = dv_sockser_read(hw_system(me)); | |
499 | } | |
500 | break; | |
501 | ||
502 | case sio_stdio: | |
503 | ||
504 | while(tx3904sio_fifo_nonempty(me, & controller->tx_fifo)) | |
505 | { | |
506 | cc = tx3904sio_fifo_pop(me, & controller->tx_fifo); | |
507 | sim_io_write_stdout(hw_system(me), & cc, 1); | |
508 | sim_io_flush_stdout(hw_system(me)); | |
509 | HW_TRACE ((me, "stdio output: %02x", cc)); | |
510 | } | |
511 | ||
512 | c = sim_io_poll_read(hw_system(me), 0 /* stdin */, & cc, 1); | |
513 | while(c == 1) | |
514 | { | |
515 | HW_TRACE ((me, "stdio input: %02x", cc)); | |
516 | tx3904sio_fifo_push(me, & controller->rx_fifo, cc); | |
517 | c = sim_io_poll_read(hw_system(me), 0 /* stdin */, & cc, 1); | |
518 | } | |
519 | ||
520 | break; | |
521 | ||
522 | default: | |
523 | hw_abort(me, "Illegal backend mode: %d", controller->backend); | |
524 | } | |
525 | ||
526 | /* Update RDIS / TDIS flags */ | |
527 | last_int = controller->sdisr & controller->sdicr; | |
528 | /* HW_TRACE ((me, "tickle - sdisr %08x sdicr %08x", controller->sdisr, controller->sdicr)); */ | |
529 | if(tx3904sio_fifo_nonempty(me, & controller->rx_fifo)) | |
530 | SDISR_SET_RDIS(controller); | |
531 | if(! tx3904sio_fifo_nonempty(me, & controller->tx_fifo)) | |
532 | SDISR_SET_TDIS(controller); | |
533 | next_int = controller->sdisr & controller->sdicr; | |
534 | /* HW_TRACE ((me, "tickle + sdisr %08x sdicr %08x", controller->sdisr, controller->sdicr)); */ | |
535 | ||
536 | if(~last_int & next_int) /* any bits set? */ | |
537 | hw_port_event(me, INT_PORT, 1); | |
538 | if(last_int & ~next_int) /* any bits cleared? */ | |
539 | hw_port_event(me, INT_PORT, 0); | |
540 | ||
541 | /* Add periodic polling for this port, if it's not already going. */ | |
542 | if(controller->poll_event == NULL) | |
543 | { | |
544 | controller->poll_event = hw_event_queue_schedule (me, 1000, | |
545 | tx3904sio_poll, NULL); | |
546 | ||
547 | } | |
548 | } | |
549 | ||
550 | ||
551 | ||
552 | ||
553 | int | |
554 | tx3904sio_fifo_nonempty(struct hw* me, struct tx3904sio_fifo* fifo) | |
555 | { | |
556 | /* HW_TRACE ((me, "fifo used: %d", fifo->used)); */ | |
557 | return(fifo->used > 0); | |
558 | } | |
559 | ||
560 | ||
561 | char | |
562 | tx3904sio_fifo_pop(struct hw* me, struct tx3904sio_fifo* fifo) | |
563 | { | |
564 | char it; | |
565 | ASSERT(fifo->used > 0); | |
566 | ASSERT(fifo->buffer != NULL); | |
567 | it = fifo->buffer[0]; | |
568 | memcpy(& fifo->buffer[0], & fifo->buffer[1], fifo->used - 1); | |
569 | fifo->used --; | |
570 | /* HW_TRACE ((me, "pop fifo -> %02x", it)); */ | |
571 | return it; | |
572 | } | |
573 | ||
574 | ||
575 | void | |
576 | tx3904sio_fifo_push(struct hw* me, struct tx3904sio_fifo* fifo, char it) | |
577 | { | |
578 | /* HW_TRACE ((me, "push %02x -> fifo", it)); */ | |
579 | if(fifo->size == fifo->used) /* full */ | |
580 | { | |
581 | int next_size = fifo->size * 2 + 16; | |
582 | char* next_buf = zalloc(next_size); | |
583 | memcpy(next_buf, fifo->buffer, fifo->used); | |
584 | ||
585 | if(fifo->buffer != NULL) zfree(fifo->buffer); | |
586 | fifo->buffer = next_buf; | |
587 | fifo->size = next_size; | |
588 | } | |
589 | ||
590 | fifo->buffer[fifo->used] = it; | |
591 | fifo->used ++; | |
592 | } | |
593 | ||
594 | ||
595 | void | |
596 | tx3904sio_fifo_reset(struct hw* me, struct tx3904sio_fifo* fifo) | |
597 | { | |
598 | /* HW_TRACE ((me, "reset fifo")); */ | |
599 | fifo->used = 0; | |
600 | fifo->size = 0; | |
601 | zfree(fifo->buffer); | |
602 | fifo->buffer = 0; | |
603 | } | |
604 | ||
605 | ||
606 | void | |
607 | tx3904sio_poll(struct hw* me, void* ignored) | |
608 | { | |
609 | struct tx3904sio* controller = hw_data (me); | |
610 | tx3904sio_tickle (me); | |
611 | hw_event_queue_deschedule (me, controller->poll_event); | |
612 | controller->poll_event = hw_event_queue_schedule (me, 1000, | |
613 | tx3904sio_poll, NULL); | |
614 | } | |
615 | ||
616 | ||
617 | ||
618 | const struct hw_descriptor dv_tx3904sio_descriptor[] = { | |
619 | { "tx3904sio", tx3904sio_finish, }, | |
620 | { NULL }, | |
621 | }; |