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c906108c SS |
1 | /* This file is part of the program GDB, the GNU debugger. |
2 | ||
3 | Copyright (C) 1998 Free Software Foundation, Inc. | |
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 | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
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. | |
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, MA 02111-1307, USA. | |
19 | ||
20 | */ | |
21 | ||
22 | ||
23 | #include "sim-main.h" | |
24 | #include "hw-main.h" | |
25 | ||
26 | ||
27 | /* DEVICE | |
28 | ||
29 | ||
30 | tx3904irc - tx3904 interrupt controller | |
31 | ||
32 | ||
33 | DESCRIPTION | |
34 | ||
35 | ||
36 | Implements the tx3904 interrupt controller described in the tx3904 | |
37 | user guide. It does not include the interrupt detection circuit | |
38 | that preprocesses the eight external interrupts, so assumes that | |
39 | each event on an input interrupt port signals a new interrupt. | |
40 | That is, it implements edge- rather than level-triggered | |
41 | interrupts. | |
42 | ||
43 | This implementation does not support multiple concurrent | |
44 | interrupts. | |
45 | ||
46 | ||
47 | PROPERTIES | |
48 | ||
49 | ||
50 | reg <base> <length> | |
51 | ||
52 | Base of IRC control register bank. <length> must equal 0x20. | |
53 | Registers offsets: 0: ISR: interrupt status register | |
54 | 4: IMR: interrupt mask register | |
55 | 16: ILR0: interrupt level register 3..0 | |
56 | 20: ILR1: interrupt level register 7..4 | |
57 | 24: ILR2: interrupt level register 11..8 | |
58 | 28: ILR3: interrupt level register 15..12 | |
59 | ||
60 | ||
61 | ||
62 | PORTS | |
63 | ||
64 | ||
65 | ip (output) | |
66 | ||
67 | Interrupt priority port. An event is generated when an interrupt | |
68 | of a sufficient priority is passed through the IRC. The value | |
69 | associated with the event is the interrupt level (16-31), as given | |
70 | for bits IP[5:0] in the book TMPR3904F Rev. 2.0, pg. 11-3. Note | |
71 | that even though INT[0] is tied externally to IP[5], we simulate | |
72 | it as passing through the controller. | |
73 | ||
74 | An output level of zero signals the clearing of a level interrupt. | |
75 | ||
76 | ||
77 | int0-7 (input) | |
78 | ||
79 | External interrupts. Level = 0 -> level interrupt cleared. | |
80 | ||
81 | ||
82 | dmac0-3 (input) | |
83 | ||
84 | DMA internal interrupts, correspond to DMA channels 0-3. Level = 0 -> level interrupt cleared. | |
85 | ||
86 | ||
87 | sio0-1 (input) | |
88 | ||
89 | SIO internal interrupts. Level = 0 -> level interrupt cleared. | |
90 | ||
91 | ||
92 | tmr0-2 (input) | |
93 | ||
94 | Timer internal interrupts. Level = 0 -> level interrupt cleared. | |
95 | ||
96 | */ | |
97 | ||
98 | ||
99 | ||
100 | ||
101 | ||
102 | /* register numbers; each is one word long */ | |
103 | enum | |
104 | { | |
105 | ISR_REG = 0, | |
106 | IMR_REG = 1, | |
107 | ILR0_REG = 4, | |
108 | ILR1_REG = 5, | |
109 | ILR2_REG = 6, | |
110 | ILR3_REG = 7, | |
111 | }; | |
112 | ||
113 | ||
114 | /* port ID's */ | |
115 | ||
116 | enum | |
117 | { | |
118 | /* inputs, ordered to correspond to interrupt sources 0..15 */ | |
119 | INT1_PORT = 0, INT2_PORT, INT3_PORT, INT4_PORT, INT5_PORT, INT6_PORT, INT7_PORT, | |
120 | DMAC3_PORT, DMAC2_PORT, DMAC1_PORT, DMAC0_PORT, SIO0_PORT, SIO1_PORT, | |
121 | TMR0_PORT, TMR1_PORT, TMR2_PORT, | |
122 | ||
123 | /* special INT[0] port */ | |
124 | INT0_PORT, | |
125 | ||
126 | /* reset */ | |
127 | RESET_PORT, | |
128 | ||
129 | /* output */ | |
130 | IP_PORT | |
131 | }; | |
132 | ||
133 | ||
134 | static const struct hw_port_descriptor tx3904irc_ports[] = { | |
135 | ||
136 | /* interrupt output */ | |
137 | ||
138 | { "ip", IP_PORT, 0, output_port, }, | |
139 | ||
140 | /* interrupt inputs (as names) */ | |
141 | /* in increasing order of level number */ | |
142 | ||
143 | { "int1", INT1_PORT, 0, input_port, }, | |
144 | { "int2", INT2_PORT, 0, input_port, }, | |
145 | { "int3", INT3_PORT, 0, input_port, }, | |
146 | { "int4", INT4_PORT, 0, input_port, }, | |
147 | { "int5", INT5_PORT, 0, input_port, }, | |
148 | { "int6", INT6_PORT, 0, input_port, }, | |
149 | { "int7", INT7_PORT, 0, input_port, }, | |
150 | ||
151 | { "dmac3", DMAC3_PORT, 0, input_port, }, | |
152 | { "dmac2", DMAC2_PORT, 0, input_port, }, | |
153 | { "dmac1", DMAC1_PORT, 0, input_port, }, | |
154 | { "dmac0", DMAC0_PORT, 0, input_port, }, | |
155 | ||
156 | { "sio0", SIO0_PORT, 0, input_port, }, | |
157 | { "sio1", SIO1_PORT, 0, input_port, }, | |
158 | ||
159 | { "tmr0", TMR0_PORT, 0, input_port, }, | |
160 | { "tmr1", TMR1_PORT, 0, input_port, }, | |
161 | { "tmr2", TMR2_PORT, 0, input_port, }, | |
162 | ||
163 | { "reset", RESET_PORT, 0, input_port, }, | |
164 | { "int0", INT0_PORT, 0, input_port, }, | |
165 | ||
166 | { NULL, }, | |
167 | }; | |
168 | ||
169 | ||
170 | #define NR_SOURCES (TMR3_PORT - INT1_PORT + 1) /* 16: number of interrupt sources */ | |
171 | ||
172 | ||
173 | /* The interrupt controller register internal state. Note that we | |
174 | store state using the control register images, in host endian | |
175 | order. */ | |
176 | ||
177 | struct tx3904irc { | |
178 | address_word base_address; /* control register base */ | |
179 | unsigned_4 isr; | |
180 | #define ISR_SET(c,s) ((c)->isr &= ~ (1 << (s))) | |
181 | unsigned_4 imr; | |
182 | #define IMR_GET(c) ((c)->imr) | |
183 | unsigned_4 ilr[4]; | |
184 | #define ILR_GET(c,s) LSEXTRACTED32((c)->ilr[(s)/4], (s) % 4 * 8 + 2, (s) % 4 * 8) | |
185 | }; | |
186 | ||
187 | ||
188 | ||
189 | /* Finish off the partially created hw device. Attach our local | |
190 | callbacks. Wire up our port names etc */ | |
191 | ||
192 | static hw_io_read_buffer_method tx3904irc_io_read_buffer; | |
193 | static hw_io_write_buffer_method tx3904irc_io_write_buffer; | |
194 | static hw_port_event_method tx3904irc_port_event; | |
195 | ||
196 | static void | |
197 | attach_tx3904irc_regs (struct hw *me, | |
198 | struct tx3904irc *controller) | |
199 | { | |
200 | unsigned_word attach_address; | |
201 | int attach_space; | |
202 | unsigned attach_size; | |
203 | reg_property_spec reg; | |
204 | ||
205 | if (hw_find_property (me, "reg") == NULL) | |
206 | hw_abort (me, "Missing \"reg\" property"); | |
207 | ||
208 | if (!hw_find_reg_array_property (me, "reg", 0, ®)) | |
209 | hw_abort (me, "\"reg\" property must contain one addr/size entry"); | |
210 | ||
211 | hw_unit_address_to_attach_address (hw_parent (me), | |
212 | ®.address, | |
213 | &attach_space, | |
214 | &attach_address, | |
215 | me); | |
216 | hw_unit_size_to_attach_size (hw_parent (me), | |
217 | ®.size, | |
218 | &attach_size, me); | |
219 | ||
220 | hw_attach_address (hw_parent (me), 0, | |
221 | attach_space, attach_address, attach_size, | |
222 | me); | |
223 | ||
224 | controller->base_address = attach_address; | |
225 | } | |
226 | ||
227 | ||
228 | static void | |
229 | tx3904irc_finish (struct hw *me) | |
230 | { | |
231 | struct tx3904irc *controller; | |
232 | ||
233 | controller = HW_ZALLOC (me, struct tx3904irc); | |
234 | set_hw_data (me, controller); | |
235 | set_hw_io_read_buffer (me, tx3904irc_io_read_buffer); | |
236 | set_hw_io_write_buffer (me, tx3904irc_io_write_buffer); | |
237 | set_hw_ports (me, tx3904irc_ports); | |
238 | set_hw_port_event (me, tx3904irc_port_event); | |
239 | ||
240 | /* Attach ourself to our parent bus */ | |
241 | attach_tx3904irc_regs (me, controller); | |
242 | ||
243 | /* Initialize to reset state */ | |
244 | controller->isr = 0x0000ffff; | |
245 | controller->imr = 0; | |
246 | controller->ilr[0] = | |
247 | controller->ilr[1] = | |
248 | controller->ilr[2] = | |
249 | controller->ilr[3] = 0; | |
250 | } | |
251 | ||
252 | ||
253 | ||
254 | /* An event arrives on an interrupt port */ | |
255 | ||
256 | static void | |
257 | tx3904irc_port_event (struct hw *me, | |
258 | int my_port, | |
259 | struct hw *source_dev, | |
260 | int source_port, | |
261 | int level) | |
262 | { | |
263 | struct tx3904irc *controller = hw_data (me); | |
264 | ||
265 | /* handle deactivated interrupt */ | |
266 | if(level == 0) | |
267 | { | |
268 | HW_TRACE ((me, "interrupt cleared on port %d", my_port)); | |
269 | hw_port_event(me, IP_PORT, 0); | |
270 | return; | |
271 | } | |
272 | ||
273 | switch (my_port) | |
274 | { | |
275 | case INT0_PORT: | |
276 | { | |
277 | int ip_number = 32; /* compute IP[5:0] */ | |
278 | HW_TRACE ((me, "port-event INT[0]")); | |
279 | hw_port_event(me, IP_PORT, ip_number); | |
280 | break; | |
281 | } | |
282 | ||
283 | case INT1_PORT: case INT2_PORT: case INT3_PORT: case INT4_PORT: | |
284 | case INT5_PORT: case INT6_PORT: case INT7_PORT: case DMAC3_PORT: | |
285 | case DMAC2_PORT: case DMAC1_PORT: case DMAC0_PORT: case SIO0_PORT: | |
286 | case SIO1_PORT: case TMR0_PORT: case TMR1_PORT: case TMR2_PORT: | |
287 | { | |
288 | int source = my_port - INT1_PORT; | |
289 | ||
290 | HW_TRACE ((me, "interrupt asserted on port %d", source)); | |
291 | ISR_SET(controller, source); | |
292 | if(ILR_GET(controller, source) > IMR_GET(controller)) | |
293 | { | |
294 | int ip_number = 16 + source; /* compute IP[4:0] */ | |
295 | HW_TRACE ((me, "interrupt level %d", ILR_GET(controller,source))); | |
296 | hw_port_event(me, IP_PORT, ip_number); | |
297 | } | |
298 | break; | |
299 | } | |
300 | ||
301 | case RESET_PORT: | |
302 | { | |
303 | HW_TRACE ((me, "reset")); | |
304 | controller->isr = 0x0000ffff; | |
305 | controller->imr = 0; | |
306 | controller->ilr[0] = | |
307 | controller->ilr[1] = | |
308 | controller->ilr[2] = | |
309 | controller->ilr[3] = 0; | |
310 | break; | |
311 | } | |
312 | ||
313 | case IP_PORT: | |
314 | hw_abort (me, "Event on output port %d", my_port); | |
315 | break; | |
316 | ||
317 | default: | |
318 | hw_abort (me, "Event on unknown port %d", my_port); | |
319 | break; | |
320 | } | |
321 | } | |
322 | ||
323 | ||
324 | /* generic read/write */ | |
325 | ||
326 | static unsigned | |
327 | tx3904irc_io_read_buffer (struct hw *me, | |
328 | void *dest, | |
329 | int space, | |
330 | unsigned_word base, | |
331 | unsigned nr_bytes) | |
332 | { | |
333 | struct tx3904irc *controller = hw_data (me); | |
334 | unsigned byte; | |
335 | ||
336 | HW_TRACE ((me, "read 0x%08lx %d", (long) base, (int) nr_bytes)); | |
337 | for (byte = 0; byte < nr_bytes; byte++) | |
338 | { | |
339 | address_word address = base + byte; | |
340 | int reg_number = (address - controller->base_address) / 4; | |
341 | int reg_offset = (address - controller->base_address) % 4; | |
342 | unsigned_4 register_value; /* in target byte order */ | |
343 | ||
344 | /* fill in entire register_value word */ | |
345 | switch (reg_number) | |
346 | { | |
347 | case ISR_REG: register_value = controller->isr; break; | |
348 | case IMR_REG: register_value = controller->imr; break; | |
349 | case ILR0_REG: register_value = controller->ilr[0]; break; | |
350 | case ILR1_REG: register_value = controller->ilr[1]; break; | |
351 | case ILR2_REG: register_value = controller->ilr[2]; break; | |
352 | case ILR3_REG: register_value = controller->ilr[3]; break; | |
353 | default: register_value = 0; | |
354 | } | |
355 | ||
356 | /* write requested byte out */ | |
357 | register_value = H2T_4(register_value); | |
358 | memcpy ((char*) dest + byte, ((char*)& register_value)+reg_offset, 1); | |
359 | } | |
360 | ||
361 | return nr_bytes; | |
362 | } | |
363 | ||
364 | ||
365 | ||
366 | static unsigned | |
367 | tx3904irc_io_write_buffer (struct hw *me, | |
368 | const void *source, | |
369 | int space, | |
370 | unsigned_word base, | |
371 | unsigned nr_bytes) | |
372 | { | |
373 | struct tx3904irc *controller = hw_data (me); | |
374 | unsigned byte; | |
375 | ||
376 | HW_TRACE ((me, "write 0x%08lx %d", (long) base, (int) nr_bytes)); | |
377 | for (byte = 0; byte < nr_bytes; byte++) | |
378 | { | |
379 | address_word address = base + byte; | |
380 | int reg_number = (address - controller->base_address) / 4; | |
381 | int reg_offset = (address - controller->base_address) % 4; | |
382 | unsigned_4* register_ptr; | |
383 | unsigned_4 register_value; | |
384 | ||
385 | /* fill in entire register_value word */ | |
386 | switch (reg_number) | |
387 | { | |
388 | case ISR_REG: register_ptr = & controller->isr; break; | |
389 | case IMR_REG: register_ptr = & controller->imr; break; | |
390 | case ILR0_REG: register_ptr = & controller->ilr[0]; break; | |
391 | case ILR1_REG: register_ptr = & controller->ilr[1]; break; | |
392 | case ILR2_REG: register_ptr = & controller->ilr[2]; break; | |
393 | case ILR3_REG: register_ptr = & controller->ilr[3]; break; | |
394 | default: register_ptr = & register_value; /* used as a dummy */ | |
395 | } | |
396 | ||
397 | /* HW_TRACE ((me, "reg %d pre: %08lx", reg_number, (long) *register_ptr)); */ | |
398 | ||
399 | /* overwrite requested byte */ | |
400 | register_value = H2T_4(* register_ptr); | |
401 | memcpy (((char*)®ister_value)+reg_offset, (const char*)source + byte, 1); | |
402 | * register_ptr = T2H_4(register_value); | |
403 | ||
404 | /* HW_TRACE ((me, "post: %08lx", (long) *register_ptr)); */ | |
405 | } | |
406 | return nr_bytes; | |
407 | } | |
408 | ||
409 | ||
410 | const struct hw_descriptor dv_tx3904irc_descriptor[] = { | |
411 | { "tx3904irc", tx3904irc_finish, }, | |
412 | { NULL }, | |
413 | }; |