Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * 6522 Versatile Interface Adapter (VIA) | |
3 | * | |
0c79cf6a | 4 | * There are two of these on the Mac II. Some IRQs are vectored |
1da177e4 LT |
5 | * via them as are assorted bits and bobs - eg RTC, ADB. |
6 | * | |
7 | * CSA: Motorola seems to have removed documentation on the 6522 from | |
8 | * their web site; try | |
9 | * http://nerini.drf.com/vectrex/other/text/chips/6522/ | |
10 | * http://www.zymurgy.net/classic/vic20/vicdet1.htm | |
11 | * and | |
12 | * http://193.23.168.87/mikro_laborversuche/via_iobaustein/via6522_1.html | |
13 | * for info. A full-text web search on 6522 AND VIA will probably also | |
14 | * net some usefulness. <cananian@alumni.princeton.edu> 20apr1999 | |
15 | * | |
67dfb153 FT |
16 | * Additional data is here (the SY6522 was used in the Mac II etc): |
17 | * http://www.6502.org/documents/datasheets/synertek/synertek_sy6522.pdf | |
18 | * http://www.6502.org/documents/datasheets/synertek/synertek_sy6522_programming_reference.pdf | |
19 | * | |
1da177e4 LT |
20 | * PRAM/RTC access algorithms are from the NetBSD RTC toolkit version 1.08b |
21 | * by Erik Vogan and adapted to Linux by Joshua M. Thompson (funaho@jurai.org) | |
22 | * | |
23 | */ | |
24 | ||
25 | #include <linux/types.h> | |
26 | #include <linux/kernel.h> | |
27 | #include <linux/mm.h> | |
28 | #include <linux/delay.h> | |
29 | #include <linux/init.h> | |
deea7775 | 30 | #include <linux/module.h> |
ddc7fd25 | 31 | #include <linux/irq.h> |
1da177e4 | 32 | |
1da177e4 LT |
33 | #include <asm/bootinfo.h> |
34 | #include <asm/macintosh.h> | |
35 | #include <asm/macints.h> | |
1da177e4 LT |
36 | #include <asm/mac_via.h> |
37 | #include <asm/mac_psc.h> | |
c85627fb | 38 | #include <asm/mac_oss.h> |
1da177e4 LT |
39 | |
40 | volatile __u8 *via1, *via2; | |
deea7775 AB |
41 | int rbv_present; |
42 | int via_alt_mapping; | |
43 | EXPORT_SYMBOL(via_alt_mapping); | |
8dfbdf4a | 44 | static __u8 rbv_clear; |
1da177e4 LT |
45 | |
46 | /* | |
47 | * Globals for accessing the VIA chip registers without having to | |
48 | * check if we're hitting a real VIA or an RBV. Normally you could | |
49 | * just hit the combined register (ie, vIER|rIER) but that seems to | |
50 | * break on AV Macs...probably because they actually decode more than | |
51 | * eight address bits. Why can't Apple engineers at least be | |
52 | * _consistently_ lazy? - 1999-05-21 (jmt) | |
53 | */ | |
54 | ||
55 | static int gIER,gIFR,gBufA,gBufB; | |
56 | ||
57 | /* | |
58 | * Timer defs. | |
59 | */ | |
60 | ||
61 | #define TICK_SIZE 10000 | |
62 | #define MAC_CLOCK_TICK (783300/HZ) /* ticks per HZ */ | |
63 | #define MAC_CLOCK_LOW (MAC_CLOCK_TICK&0xFF) | |
64 | #define MAC_CLOCK_HIGH (MAC_CLOCK_TICK>>8) | |
65 | ||
c4af5da7 FT |
66 | |
67 | /* | |
68 | * On Macs with a genuine VIA chip there is no way to mask an individual slot | |
69 | * interrupt. This limitation also seems to apply to VIA clone logic cores in | |
70 | * Quadra-like ASICs. (RBV and OSS machines don't have this limitation.) | |
71 | * | |
72 | * We used to fake it by configuring the relevent VIA pin as an output | |
73 | * (to mask the interrupt) or input (to unmask). That scheme did not work on | |
74 | * (at least) the Quadra 700. A NuBus card's /NMRQ signal is an open-collector | |
75 | * circuit (see Designing Cards and Drivers for Macintosh II and Macintosh SE, | |
76 | * p. 10-11 etc) but VIA outputs are not (see datasheet). | |
77 | * | |
78 | * Driving these outputs high must cause the VIA to source current and the | |
79 | * card to sink current when it asserts /NMRQ. Current will flow but the pin | |
80 | * voltage is uncertain and so the /NMRQ condition may still cause a transition | |
81 | * at the VIA2 CA1 input (which explains the lost interrupts). A side effect | |
82 | * is that a disabled slot IRQ can never be tested as pending or not. | |
83 | * | |
84 | * Driving these outputs low doesn't work either. All the slot /NMRQ lines are | |
85 | * (active low) OR'd together to generate the CA1 (aka "SLOTS") interrupt (see | |
86 | * The Guide To Macintosh Family Hardware, 2nd edition p. 167). If we drive a | |
87 | * disabled /NMRQ line low, the falling edge immediately triggers a CA1 | |
88 | * interrupt and all slot interrupts after that will generate no transition | |
89 | * and therefore no interrupt, even after being re-enabled. | |
90 | * | |
91 | * So we make the VIA port A I/O lines inputs and use nubus_disabled to keep | |
92 | * track of their states. When any slot IRQ becomes disabled we mask the CA1 | |
93 | * umbrella interrupt. Only when all slot IRQs become enabled do we unmask | |
94 | * the CA1 interrupt. It must remain enabled even when cards have no interrupt | |
95 | * handler registered. Drivers must therefore disable a slot interrupt at the | |
96 | * device before they call free_irq (like shared and autovector interrupts). | |
97 | * | |
98 | * There is also a related problem when MacOS is used to boot Linux. A network | |
99 | * card brought up by a MacOS driver may raise an interrupt while Linux boots. | |
100 | * This can be fatal since it can't be handled until the right driver loads | |
101 | * (if such a driver exists at all). Apparently related to this hardware | |
102 | * limitation, "Designing Cards and Drivers", p. 9-8, says that a slot | |
103 | * interrupt with no driver would crash MacOS (the book was written before | |
104 | * the appearance of Macs with RBV or OSS). | |
cd713ddc | 105 | */ |
c4af5da7 | 106 | |
cd713ddc | 107 | static u8 nubus_disabled; |
1da177e4 LT |
108 | |
109 | void via_debug_dump(void); | |
1da177e4 | 110 | |
1da177e4 LT |
111 | /* |
112 | * Initialize the VIAs | |
113 | * | |
114 | * First we figure out where they actually _are_ as well as what type of | |
115 | * VIA we have for VIA2 (it could be a real VIA or an RBV or even an OSS.) | |
116 | * Then we pretty much clear them out and disable all IRQ sources. | |
117 | * | |
118 | * Note: the OSS is actually "detected" here and not in oss_init(). It just | |
119 | * seems more logical to do it here since via_init() needs to know | |
120 | * these things anyways. | |
121 | */ | |
122 | ||
123 | void __init via_init(void) | |
124 | { | |
125 | switch(macintosh_config->via_type) { | |
126 | ||
127 | /* IIci, IIsi, IIvx, IIvi (P6xx), LC series */ | |
128 | ||
608e287b | 129 | case MAC_VIA_IICI: |
1da177e4 LT |
130 | via1 = (void *) VIA1_BASE; |
131 | if (macintosh_config->ident == MAC_MODEL_IIFX) { | |
132 | via2 = NULL; | |
133 | rbv_present = 0; | |
134 | oss_present = 1; | |
135 | } else { | |
136 | via2 = (void *) RBV_BASE; | |
137 | rbv_present = 1; | |
138 | oss_present = 0; | |
139 | } | |
140 | if (macintosh_config->ident == MAC_MODEL_LCIII) { | |
141 | rbv_clear = 0x00; | |
142 | } else { | |
143 | /* on most RBVs (& unlike the VIAs), you */ | |
144 | /* need to set bit 7 when you write to IFR */ | |
145 | /* in order for your clear to occur. */ | |
146 | rbv_clear = 0x80; | |
147 | } | |
148 | gIER = rIER; | |
149 | gIFR = rIFR; | |
150 | gBufA = rSIFR; | |
151 | gBufB = rBufB; | |
152 | break; | |
153 | ||
154 | /* Quadra and early MacIIs agree on the VIA locations */ | |
155 | ||
156 | case MAC_VIA_QUADRA: | |
157 | case MAC_VIA_II: | |
158 | via1 = (void *) VIA1_BASE; | |
159 | via2 = (void *) VIA2_BASE; | |
160 | rbv_present = 0; | |
161 | oss_present = 0; | |
162 | rbv_clear = 0x00; | |
163 | gIER = vIER; | |
164 | gIFR = vIFR; | |
165 | gBufA = vBufA; | |
166 | gBufB = vBufB; | |
167 | break; | |
168 | default: | |
169 | panic("UNKNOWN VIA TYPE"); | |
170 | } | |
171 | ||
172 | printk(KERN_INFO "VIA1 at %p is a 6522 or clone\n", via1); | |
173 | ||
174 | printk(KERN_INFO "VIA2 at %p is ", via2); | |
175 | if (rbv_present) { | |
67dfb153 | 176 | printk("an RBV\n"); |
1da177e4 | 177 | } else if (oss_present) { |
67dfb153 | 178 | printk("an OSS\n"); |
1da177e4 | 179 | } else { |
67dfb153 | 180 | printk("a 6522 or clone\n"); |
1da177e4 LT |
181 | } |
182 | ||
183 | #ifdef DEBUG_VIA | |
184 | via_debug_dump(); | |
185 | #endif | |
186 | ||
187 | /* | |
188 | * Shut down all IRQ sources, reset the timers, and | |
189 | * kill the timer latch on VIA1. | |
190 | */ | |
191 | ||
192 | via1[vIER] = 0x7F; | |
193 | via1[vIFR] = 0x7F; | |
194 | via1[vT1LL] = 0; | |
195 | via1[vT1LH] = 0; | |
196 | via1[vT1CL] = 0; | |
197 | via1[vT1CH] = 0; | |
198 | via1[vT2CL] = 0; | |
199 | via1[vT2CH] = 0; | |
4a973592 | 200 | via1[vACR] &= ~0xC0; /* setup T1 timer with no PB7 output */ |
67dfb153 | 201 | via1[vACR] &= ~0x03; /* disable port A & B latches */ |
1da177e4 LT |
202 | |
203 | /* | |
204 | * SE/30: disable video IRQ | |
205 | * XXX: testing for SE/30 VBL | |
206 | */ | |
207 | ||
208 | if (macintosh_config->ident == MAC_MODEL_SE30) { | |
209 | via1[vDirB] |= 0x40; | |
210 | via1[vBufB] |= 0x40; | |
211 | } | |
212 | ||
213 | /* | |
214 | * Set the RTC bits to a known state: all lines to outputs and | |
215 | * RTC disabled (yes that's 0 to enable and 1 to disable). | |
216 | */ | |
217 | ||
218 | via1[vDirB] |= (VIA1B_vRTCEnb | VIA1B_vRTCClk | VIA1B_vRTCData); | |
219 | via1[vBufB] |= (VIA1B_vRTCEnb | VIA1B_vRTCClk); | |
220 | ||
221 | /* Everything below this point is VIA2/RBV only... */ | |
222 | ||
4a973592 FT |
223 | if (oss_present) |
224 | return; | |
1da177e4 | 225 | |
8d9f014a FT |
226 | if ((macintosh_config->via_type == MAC_VIA_QUADRA) && |
227 | (macintosh_config->adb_type != MAC_ADB_PB1) && | |
228 | (macintosh_config->adb_type != MAC_ADB_PB2) && | |
229 | (macintosh_config->ident != MAC_MODEL_C660) && | |
230 | (macintosh_config->ident != MAC_MODEL_Q840)) { | |
231 | via_alt_mapping = 1; | |
232 | via1[vDirB] |= 0x40; | |
233 | via1[vBufB] &= ~0x40; | |
234 | } else { | |
235 | via_alt_mapping = 0; | |
236 | } | |
1da177e4 LT |
237 | |
238 | /* | |
239 | * Now initialize VIA2. For RBV we just kill all interrupts; | |
240 | * for a regular VIA we also reset the timers and stuff. | |
241 | */ | |
242 | ||
243 | via2[gIER] = 0x7F; | |
244 | via2[gIFR] = 0x7F | rbv_clear; | |
245 | if (!rbv_present) { | |
246 | via2[vT1LL] = 0; | |
247 | via2[vT1LH] = 0; | |
248 | via2[vT1CL] = 0; | |
249 | via2[vT1CH] = 0; | |
250 | via2[vT2CL] = 0; | |
251 | via2[vT2CH] = 0; | |
4a973592 | 252 | via2[vACR] &= ~0xC0; /* setup T1 timer with no PB7 output */ |
67dfb153 FT |
253 | via2[vACR] &= ~0x03; /* disable port A & B latches */ |
254 | } | |
255 | ||
aa8a9fbe FT |
256 | /* Everything below this point is VIA2 only... */ |
257 | ||
258 | if (rbv_present) | |
259 | return; | |
260 | ||
67dfb153 | 261 | /* |
aa8a9fbe FT |
262 | * Set vPCR for control line interrupts. |
263 | * | |
264 | * CA1 (SLOTS IRQ), CB1 (ASC IRQ): negative edge trigger. | |
265 | * | |
266 | * Macs with ESP SCSI have a negative edge triggered SCSI interrupt. | |
267 | * Testing reveals that PowerBooks do too. However, the SE/30 | |
268 | * schematic diagram shows an active high NCR5380 IRQ line. | |
67dfb153 | 269 | */ |
aa8a9fbe FT |
270 | |
271 | pr_debug("VIA2 vPCR is 0x%02X\n", via2[vPCR]); | |
272 | if (macintosh_config->via_type == MAC_VIA_II) { | |
273 | /* CA2 (SCSI DRQ), CB2 (SCSI IRQ): indep. input, pos. edge */ | |
274 | via2[vPCR] = 0x66; | |
275 | } else { | |
276 | /* CA2 (SCSI DRQ), CB2 (SCSI IRQ): indep. input, neg. edge */ | |
277 | via2[vPCR] = 0x22; | |
1da177e4 LT |
278 | } |
279 | } | |
280 | ||
281 | /* | |
282 | * Start the 100 Hz clock | |
283 | */ | |
284 | ||
40220c1a | 285 | void __init via_init_clock(irq_handler_t func) |
1da177e4 LT |
286 | { |
287 | via1[vACR] |= 0x40; | |
288 | via1[vT1LL] = MAC_CLOCK_LOW; | |
289 | via1[vT1LH] = MAC_CLOCK_HIGH; | |
290 | via1[vT1CL] = MAC_CLOCK_LOW; | |
291 | via1[vT1CH] = MAC_CLOCK_HIGH; | |
292 | ||
5a239453 | 293 | if (request_irq(IRQ_MAC_TIMER_1, func, 0, "timer", func)) |
92c3dd15 | 294 | pr_err("Couldn't register %s interrupt\n", "timer"); |
1da177e4 LT |
295 | } |
296 | ||
1da177e4 LT |
297 | /* |
298 | * Debugging dump, used in various places to see what's going on. | |
299 | */ | |
300 | ||
301 | void via_debug_dump(void) | |
302 | { | |
303 | printk(KERN_DEBUG "VIA1: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n", | |
304 | (uint) via1[vDirA], (uint) via1[vDirB], (uint) via1[vACR]); | |
305 | printk(KERN_DEBUG " PCR = 0x%02X IFR = 0x%02X IER = 0x%02X\n", | |
306 | (uint) via1[vPCR], (uint) via1[vIFR], (uint) via1[vIER]); | |
307 | if (oss_present) { | |
308 | printk(KERN_DEBUG "VIA2: <OSS>\n"); | |
309 | } else if (rbv_present) { | |
310 | printk(KERN_DEBUG "VIA2: IFR = 0x%02X IER = 0x%02X\n", | |
311 | (uint) via2[rIFR], (uint) via2[rIER]); | |
312 | printk(KERN_DEBUG " SIFR = 0x%02X SIER = 0x%02X\n", | |
313 | (uint) via2[rSIFR], (uint) via2[rSIER]); | |
314 | } else { | |
315 | printk(KERN_DEBUG "VIA2: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n", | |
316 | (uint) via2[vDirA], (uint) via2[vDirB], | |
317 | (uint) via2[vACR]); | |
318 | printk(KERN_DEBUG " PCR = 0x%02X IFR = 0x%02X IER = 0x%02X\n", | |
319 | (uint) via2[vPCR], | |
320 | (uint) via2[vIFR], (uint) via2[vIER]); | |
321 | } | |
322 | } | |
323 | ||
324 | /* | |
325 | * This is always executed with interrupts disabled. | |
326 | * | |
327 | * TBI: get time offset between scheduling timer ticks | |
328 | */ | |
329 | ||
330 | unsigned long mac_gettimeoffset (void) | |
331 | { | |
332 | unsigned long ticks, offset = 0; | |
333 | ||
334 | /* read VIA1 timer 2 current value */ | |
335 | ticks = via1[vT1CL] | (via1[vT1CH] << 8); | |
336 | /* The probability of underflow is less than 2% */ | |
337 | if (ticks > MAC_CLOCK_TICK - MAC_CLOCK_TICK / 50) | |
338 | /* Check for pending timer interrupt in VIA1 IFR */ | |
339 | if (via1[vIFR] & 0x40) offset = TICK_SIZE; | |
340 | ||
341 | ticks = MAC_CLOCK_TICK - ticks; | |
342 | ticks = ticks * 10000L / MAC_CLOCK_TICK; | |
343 | ||
344 | return ticks + offset; | |
345 | } | |
346 | ||
347 | /* | |
348 | * Flush the L2 cache on Macs that have it by flipping | |
349 | * the system into 24-bit mode for an instant. | |
350 | */ | |
351 | ||
352 | void via_flush_cache(void) | |
353 | { | |
354 | via2[gBufB] &= ~VIA2B_vMode32; | |
355 | via2[gBufB] |= VIA2B_vMode32; | |
356 | } | |
357 | ||
358 | /* | |
359 | * Return the status of the L2 cache on a IIci | |
360 | */ | |
361 | ||
362 | int via_get_cache_disable(void) | |
363 | { | |
364 | /* Safeguard against being called accidentally */ | |
365 | if (!via2) { | |
366 | printk(KERN_ERR "via_get_cache_disable called on a non-VIA machine!\n"); | |
367 | return 1; | |
368 | } | |
369 | ||
370 | return (int) via2[gBufB] & VIA2B_vCDis; | |
371 | } | |
372 | ||
373 | /* | |
374 | * Initialize VIA2 for Nubus access | |
375 | */ | |
376 | ||
377 | void __init via_nubus_init(void) | |
378 | { | |
1da177e4 LT |
379 | /* unlock nubus transactions */ |
380 | ||
67dfb153 FT |
381 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && |
382 | (macintosh_config->adb_type != MAC_ADB_PB2)) { | |
1da177e4 | 383 | /* set the line to be an output on non-RBV machines */ |
67dfb153 | 384 | if (!rbv_present) |
1da177e4 | 385 | via2[vDirB] |= 0x02; |
1da177e4 | 386 | |
67dfb153 FT |
387 | /* this seems to be an ADB bit on PMU machines */ |
388 | /* according to MkLinux. -- jmt */ | |
1da177e4 LT |
389 | via2[gBufB] |= 0x02; |
390 | } | |
391 | ||
c4af5da7 FT |
392 | /* |
393 | * Disable the slot interrupts. On some hardware that's not possible. | |
394 | * On some hardware it's unclear what all of these I/O lines do. | |
395 | */ | |
cd713ddc FT |
396 | |
397 | switch (macintosh_config->via_type) { | |
398 | case MAC_VIA_II: | |
c4af5da7 FT |
399 | case MAC_VIA_QUADRA: |
400 | pr_debug("VIA2 vDirA is 0x%02X\n", via2[vDirA]); | |
cd713ddc | 401 | break; |
608e287b | 402 | case MAC_VIA_IICI: |
cd713ddc | 403 | /* RBV. Disable all the slot interrupts. SIER works like IER. */ |
1da177e4 | 404 | via2[rSIER] = 0x7F; |
cd713ddc | 405 | break; |
c4af5da7 FT |
406 | } |
407 | } | |
408 | ||
409 | void via_nubus_irq_startup(int irq) | |
410 | { | |
411 | int irq_idx = IRQ_IDX(irq); | |
412 | ||
413 | switch (macintosh_config->via_type) { | |
414 | case MAC_VIA_II: | |
cd713ddc | 415 | case MAC_VIA_QUADRA: |
c4af5da7 FT |
416 | /* Make the port A line an input. Probably redundant. */ |
417 | if (macintosh_config->via_type == MAC_VIA_II) { | |
418 | /* The top two bits are RAM size outputs. */ | |
419 | via2[vDirA] &= 0xC0 | ~(1 << irq_idx); | |
420 | } else { | |
421 | /* Allow NuBus slots 9 through F. */ | |
422 | via2[vDirA] &= 0x80 | ~(1 << irq_idx); | |
1da177e4 | 423 | } |
c4af5da7 | 424 | /* fall through */ |
608e287b | 425 | case MAC_VIA_IICI: |
c4af5da7 FT |
426 | via_irq_enable(irq); |
427 | break; | |
428 | } | |
429 | } | |
430 | ||
431 | void via_nubus_irq_shutdown(int irq) | |
432 | { | |
433 | switch (macintosh_config->via_type) { | |
434 | case MAC_VIA_II: | |
435 | case MAC_VIA_QUADRA: | |
436 | /* Ensure that the umbrella CA1 interrupt remains enabled. */ | |
437 | via_irq_enable(irq); | |
438 | break; | |
608e287b | 439 | case MAC_VIA_IICI: |
c4af5da7 | 440 | via_irq_disable(irq); |
cd713ddc | 441 | break; |
1da177e4 LT |
442 | } |
443 | } | |
444 | ||
445 | /* | |
446 | * The generic VIA interrupt routines (shamelessly stolen from Alan Cox's | |
447 | * via6522.c :-), disable/pending masks added. | |
1da177e4 LT |
448 | */ |
449 | ||
9145db56 GU |
450 | void via1_irq(unsigned int irq, struct irq_desc *desc) |
451 | { | |
452 | int irq_num; | |
453 | unsigned char irq_bit, events; | |
454 | ||
455 | events = via1[vIFR] & via1[vIER] & 0x7F; | |
456 | if (!events) | |
457 | return; | |
458 | ||
459 | irq_num = VIA1_SOURCE_BASE; | |
460 | irq_bit = 1; | |
461 | do { | |
462 | if (events & irq_bit) { | |
463 | via1[vIFR] = irq_bit; | |
464 | generic_handle_irq(irq_num); | |
465 | } | |
466 | ++irq_num; | |
467 | irq_bit <<= 1; | |
468 | } while (events >= irq_bit); | |
469 | } | |
470 | ||
471 | static void via2_irq(unsigned int irq, struct irq_desc *desc) | |
472 | { | |
473 | int irq_num; | |
474 | unsigned char irq_bit, events; | |
475 | ||
476 | events = via2[gIFR] & via2[gIER] & 0x7F; | |
477 | if (!events) | |
478 | return; | |
479 | ||
480 | irq_num = VIA2_SOURCE_BASE; | |
481 | irq_bit = 1; | |
482 | do { | |
483 | if (events & irq_bit) { | |
484 | via2[gIFR] = irq_bit | rbv_clear; | |
485 | generic_handle_irq(irq_num); | |
486 | } | |
487 | ++irq_num; | |
488 | irq_bit <<= 1; | |
489 | } while (events >= irq_bit); | |
490 | } | |
1da177e4 LT |
491 | |
492 | /* | |
493 | * Dispatch Nubus interrupts. We are called as a secondary dispatch by the | |
494 | * VIA2 dispatcher as a fast interrupt handler. | |
495 | */ | |
496 | ||
9145db56 GU |
497 | void via_nubus_irq(unsigned int irq, struct irq_desc *desc) |
498 | { | |
499 | int slot_irq; | |
500 | unsigned char slot_bit, events; | |
501 | ||
502 | events = ~via2[gBufA] & 0x7F; | |
503 | if (rbv_present) | |
504 | events &= via2[rSIER]; | |
505 | else | |
506 | events &= ~via2[vDirA]; | |
507 | if (!events) | |
508 | return; | |
509 | ||
510 | do { | |
511 | slot_irq = IRQ_NUBUS_F; | |
512 | slot_bit = 0x40; | |
513 | do { | |
514 | if (events & slot_bit) { | |
515 | events &= ~slot_bit; | |
516 | generic_handle_irq(slot_irq); | |
517 | } | |
518 | --slot_irq; | |
519 | slot_bit >>= 1; | |
520 | } while (events); | |
521 | ||
522 | /* clear the CA1 interrupt and make certain there's no more. */ | |
523 | via2[gIFR] = 0x02 | rbv_clear; | |
524 | events = ~via2[gBufA] & 0x7F; | |
525 | if (rbv_present) | |
526 | events &= via2[rSIER]; | |
527 | else | |
528 | events &= ~via2[vDirA]; | |
529 | } while (events); | |
530 | } | |
9145db56 GU |
531 | |
532 | /* | |
533 | * Register the interrupt dispatchers for VIA or RBV machines only. | |
534 | */ | |
535 | ||
536 | void __init via_register_interrupts(void) | |
537 | { | |
9145db56 GU |
538 | if (via_alt_mapping) { |
539 | /* software interrupt */ | |
540 | irq_set_chained_handler(IRQ_AUTO_1, via1_irq); | |
541 | /* via1 interrupt */ | |
542 | irq_set_chained_handler(IRQ_AUTO_6, via1_irq); | |
543 | } else { | |
544 | irq_set_chained_handler(IRQ_AUTO_1, via1_irq); | |
545 | } | |
546 | irq_set_chained_handler(IRQ_AUTO_2, via2_irq); | |
547 | irq_set_chained_handler(IRQ_MAC_NUBUS, via_nubus_irq); | |
9145db56 | 548 | } |
1da177e4 LT |
549 | |
550 | void via_irq_enable(int irq) { | |
551 | int irq_src = IRQ_SRC(irq); | |
552 | int irq_idx = IRQ_IDX(irq); | |
1da177e4 LT |
553 | |
554 | #ifdef DEBUG_IRQUSE | |
555 | printk(KERN_DEBUG "via_irq_enable(%d)\n", irq); | |
556 | #endif | |
557 | ||
558 | if (irq_src == 1) { | |
cd713ddc | 559 | via1[vIER] = IER_SET_BIT(irq_idx); |
1da177e4 | 560 | } else if (irq_src == 2) { |
cd713ddc FT |
561 | if (irq != IRQ_MAC_NUBUS || nubus_disabled == 0) |
562 | via2[gIER] = IER_SET_BIT(irq_idx); | |
1da177e4 | 563 | } else if (irq_src == 7) { |
cd713ddc FT |
564 | switch (macintosh_config->via_type) { |
565 | case MAC_VIA_II: | |
c4af5da7 | 566 | case MAC_VIA_QUADRA: |
cd713ddc FT |
567 | nubus_disabled &= ~(1 << irq_idx); |
568 | /* Enable the CA1 interrupt when no slot is disabled. */ | |
569 | if (!nubus_disabled) | |
570 | via2[gIER] = IER_SET_BIT(1); | |
571 | break; | |
608e287b | 572 | case MAC_VIA_IICI: |
cd713ddc FT |
573 | /* On RBV, enable the slot interrupt. |
574 | * SIER works like IER. | |
575 | */ | |
1da177e4 | 576 | via2[rSIER] = IER_SET_BIT(irq_idx); |
cd713ddc | 577 | break; |
1da177e4 | 578 | } |
1da177e4 LT |
579 | } |
580 | } | |
581 | ||
582 | void via_irq_disable(int irq) { | |
583 | int irq_src = IRQ_SRC(irq); | |
584 | int irq_idx = IRQ_IDX(irq); | |
1da177e4 LT |
585 | |
586 | #ifdef DEBUG_IRQUSE | |
587 | printk(KERN_DEBUG "via_irq_disable(%d)\n", irq); | |
588 | #endif | |
589 | ||
590 | if (irq_src == 1) { | |
cd713ddc | 591 | via1[vIER] = IER_CLR_BIT(irq_idx); |
1da177e4 | 592 | } else if (irq_src == 2) { |
cd713ddc | 593 | via2[gIER] = IER_CLR_BIT(irq_idx); |
1da177e4 | 594 | } else if (irq_src == 7) { |
cd713ddc FT |
595 | switch (macintosh_config->via_type) { |
596 | case MAC_VIA_II: | |
c4af5da7 | 597 | case MAC_VIA_QUADRA: |
cd713ddc FT |
598 | nubus_disabled |= 1 << irq_idx; |
599 | if (nubus_disabled) | |
600 | via2[gIER] = IER_CLR_BIT(1); | |
601 | break; | |
608e287b | 602 | case MAC_VIA_IICI: |
1da177e4 | 603 | via2[rSIER] = IER_CLR_BIT(irq_idx); |
cd713ddc | 604 | break; |
1da177e4 | 605 | } |
1da177e4 LT |
606 | } |
607 | } | |
608 | ||
8852ecd9 LV |
609 | void via1_set_head(int head) |
610 | { | |
611 | if (head == 0) | |
612 | via1[vBufA] &= ~VIA1A_vHeadSel; | |
613 | else | |
614 | via1[vBufA] |= VIA1A_vHeadSel; | |
615 | } | |
616 | EXPORT_SYMBOL(via1_set_head); | |
30c0527d FT |
617 | |
618 | int via2_scsi_drq_pending(void) | |
619 | { | |
620 | return via2[gIFR] & (1 << IRQ_IDX(IRQ_MAC_SCSIDRQ)); | |
621 | } | |
622 | EXPORT_SYMBOL(via2_scsi_drq_pending); |