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Commit | Line | Data |
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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/macintosh.h> |
34 | #include <asm/macints.h> | |
1da177e4 LT |
35 | #include <asm/mac_via.h> |
36 | #include <asm/mac_psc.h> | |
c85627fb | 37 | #include <asm/mac_oss.h> |
1da177e4 LT |
38 | |
39 | volatile __u8 *via1, *via2; | |
deea7775 AB |
40 | int rbv_present; |
41 | int via_alt_mapping; | |
42 | EXPORT_SYMBOL(via_alt_mapping); | |
8dfbdf4a | 43 | static __u8 rbv_clear; |
1da177e4 LT |
44 | |
45 | /* | |
46 | * Globals for accessing the VIA chip registers without having to | |
47 | * check if we're hitting a real VIA or an RBV. Normally you could | |
48 | * just hit the combined register (ie, vIER|rIER) but that seems to | |
49 | * break on AV Macs...probably because they actually decode more than | |
50 | * eight address bits. Why can't Apple engineers at least be | |
51 | * _consistently_ lazy? - 1999-05-21 (jmt) | |
52 | */ | |
53 | ||
54 | static int gIER,gIFR,gBufA,gBufB; | |
55 | ||
56 | /* | |
57 | * Timer defs. | |
58 | */ | |
59 | ||
60 | #define TICK_SIZE 10000 | |
61 | #define MAC_CLOCK_TICK (783300/HZ) /* ticks per HZ */ | |
62 | #define MAC_CLOCK_LOW (MAC_CLOCK_TICK&0xFF) | |
63 | #define MAC_CLOCK_HIGH (MAC_CLOCK_TICK>>8) | |
64 | ||
c4af5da7 FT |
65 | |
66 | /* | |
67 | * On Macs with a genuine VIA chip there is no way to mask an individual slot | |
68 | * interrupt. This limitation also seems to apply to VIA clone logic cores in | |
69 | * Quadra-like ASICs. (RBV and OSS machines don't have this limitation.) | |
70 | * | |
71 | * We used to fake it by configuring the relevent VIA pin as an output | |
72 | * (to mask the interrupt) or input (to unmask). That scheme did not work on | |
73 | * (at least) the Quadra 700. A NuBus card's /NMRQ signal is an open-collector | |
74 | * circuit (see Designing Cards and Drivers for Macintosh II and Macintosh SE, | |
75 | * p. 10-11 etc) but VIA outputs are not (see datasheet). | |
76 | * | |
77 | * Driving these outputs high must cause the VIA to source current and the | |
78 | * card to sink current when it asserts /NMRQ. Current will flow but the pin | |
79 | * voltage is uncertain and so the /NMRQ condition may still cause a transition | |
80 | * at the VIA2 CA1 input (which explains the lost interrupts). A side effect | |
81 | * is that a disabled slot IRQ can never be tested as pending or not. | |
82 | * | |
83 | * Driving these outputs low doesn't work either. All the slot /NMRQ lines are | |
84 | * (active low) OR'd together to generate the CA1 (aka "SLOTS") interrupt (see | |
85 | * The Guide To Macintosh Family Hardware, 2nd edition p. 167). If we drive a | |
86 | * disabled /NMRQ line low, the falling edge immediately triggers a CA1 | |
87 | * interrupt and all slot interrupts after that will generate no transition | |
88 | * and therefore no interrupt, even after being re-enabled. | |
89 | * | |
90 | * So we make the VIA port A I/O lines inputs and use nubus_disabled to keep | |
91 | * track of their states. When any slot IRQ becomes disabled we mask the CA1 | |
92 | * umbrella interrupt. Only when all slot IRQs become enabled do we unmask | |
93 | * the CA1 interrupt. It must remain enabled even when cards have no interrupt | |
94 | * handler registered. Drivers must therefore disable a slot interrupt at the | |
95 | * device before they call free_irq (like shared and autovector interrupts). | |
96 | * | |
97 | * There is also a related problem when MacOS is used to boot Linux. A network | |
98 | * card brought up by a MacOS driver may raise an interrupt while Linux boots. | |
99 | * This can be fatal since it can't be handled until the right driver loads | |
100 | * (if such a driver exists at all). Apparently related to this hardware | |
101 | * limitation, "Designing Cards and Drivers", p. 9-8, says that a slot | |
102 | * interrupt with no driver would crash MacOS (the book was written before | |
103 | * the appearance of Macs with RBV or OSS). | |
cd713ddc | 104 | */ |
c4af5da7 | 105 | |
cd713ddc | 106 | static u8 nubus_disabled; |
1da177e4 LT |
107 | |
108 | void via_debug_dump(void); | |
1da177e4 | 109 | |
1da177e4 LT |
110 | /* |
111 | * Initialize the VIAs | |
112 | * | |
113 | * First we figure out where they actually _are_ as well as what type of | |
114 | * VIA we have for VIA2 (it could be a real VIA or an RBV or even an OSS.) | |
115 | * Then we pretty much clear them out and disable all IRQ sources. | |
116 | * | |
117 | * Note: the OSS is actually "detected" here and not in oss_init(). It just | |
118 | * seems more logical to do it here since via_init() needs to know | |
119 | * these things anyways. | |
120 | */ | |
121 | ||
122 | void __init via_init(void) | |
123 | { | |
124 | switch(macintosh_config->via_type) { | |
125 | ||
126 | /* IIci, IIsi, IIvx, IIvi (P6xx), LC series */ | |
127 | ||
608e287b | 128 | case MAC_VIA_IICI: |
1da177e4 LT |
129 | via1 = (void *) VIA1_BASE; |
130 | if (macintosh_config->ident == MAC_MODEL_IIFX) { | |
131 | via2 = NULL; | |
132 | rbv_present = 0; | |
133 | oss_present = 1; | |
134 | } else { | |
135 | via2 = (void *) RBV_BASE; | |
136 | rbv_present = 1; | |
137 | oss_present = 0; | |
138 | } | |
139 | if (macintosh_config->ident == MAC_MODEL_LCIII) { | |
140 | rbv_clear = 0x00; | |
141 | } else { | |
142 | /* on most RBVs (& unlike the VIAs), you */ | |
143 | /* need to set bit 7 when you write to IFR */ | |
144 | /* in order for your clear to occur. */ | |
145 | rbv_clear = 0x80; | |
146 | } | |
147 | gIER = rIER; | |
148 | gIFR = rIFR; | |
149 | gBufA = rSIFR; | |
150 | gBufB = rBufB; | |
151 | break; | |
152 | ||
153 | /* Quadra and early MacIIs agree on the VIA locations */ | |
154 | ||
155 | case MAC_VIA_QUADRA: | |
156 | case MAC_VIA_II: | |
157 | via1 = (void *) VIA1_BASE; | |
158 | via2 = (void *) VIA2_BASE; | |
159 | rbv_present = 0; | |
160 | oss_present = 0; | |
161 | rbv_clear = 0x00; | |
162 | gIER = vIER; | |
163 | gIFR = vIFR; | |
164 | gBufA = vBufA; | |
165 | gBufB = vBufB; | |
166 | break; | |
167 | default: | |
168 | panic("UNKNOWN VIA TYPE"); | |
169 | } | |
170 | ||
171 | printk(KERN_INFO "VIA1 at %p is a 6522 or clone\n", via1); | |
172 | ||
173 | printk(KERN_INFO "VIA2 at %p is ", via2); | |
174 | if (rbv_present) { | |
67dfb153 | 175 | printk("an RBV\n"); |
1da177e4 | 176 | } else if (oss_present) { |
67dfb153 | 177 | printk("an OSS\n"); |
1da177e4 | 178 | } else { |
67dfb153 | 179 | printk("a 6522 or clone\n"); |
1da177e4 LT |
180 | } |
181 | ||
182 | #ifdef DEBUG_VIA | |
183 | via_debug_dump(); | |
184 | #endif | |
185 | ||
186 | /* | |
187 | * Shut down all IRQ sources, reset the timers, and | |
188 | * kill the timer latch on VIA1. | |
189 | */ | |
190 | ||
191 | via1[vIER] = 0x7F; | |
192 | via1[vIFR] = 0x7F; | |
193 | via1[vT1LL] = 0; | |
194 | via1[vT1LH] = 0; | |
195 | via1[vT1CL] = 0; | |
196 | via1[vT1CH] = 0; | |
197 | via1[vT2CL] = 0; | |
198 | via1[vT2CH] = 0; | |
4a973592 | 199 | via1[vACR] &= ~0xC0; /* setup T1 timer with no PB7 output */ |
67dfb153 | 200 | via1[vACR] &= ~0x03; /* disable port A & B latches */ |
1da177e4 LT |
201 | |
202 | /* | |
203 | * SE/30: disable video IRQ | |
204 | * XXX: testing for SE/30 VBL | |
205 | */ | |
206 | ||
207 | if (macintosh_config->ident == MAC_MODEL_SE30) { | |
208 | via1[vDirB] |= 0x40; | |
209 | via1[vBufB] |= 0x40; | |
210 | } | |
211 | ||
212 | /* | |
213 | * Set the RTC bits to a known state: all lines to outputs and | |
214 | * RTC disabled (yes that's 0 to enable and 1 to disable). | |
215 | */ | |
216 | ||
217 | via1[vDirB] |= (VIA1B_vRTCEnb | VIA1B_vRTCClk | VIA1B_vRTCData); | |
218 | via1[vBufB] |= (VIA1B_vRTCEnb | VIA1B_vRTCClk); | |
219 | ||
220 | /* Everything below this point is VIA2/RBV only... */ | |
221 | ||
4a973592 FT |
222 | if (oss_present) |
223 | return; | |
1da177e4 | 224 | |
8d9f014a FT |
225 | if ((macintosh_config->via_type == MAC_VIA_QUADRA) && |
226 | (macintosh_config->adb_type != MAC_ADB_PB1) && | |
227 | (macintosh_config->adb_type != MAC_ADB_PB2) && | |
228 | (macintosh_config->ident != MAC_MODEL_C660) && | |
229 | (macintosh_config->ident != MAC_MODEL_Q840)) { | |
230 | via_alt_mapping = 1; | |
231 | via1[vDirB] |= 0x40; | |
232 | via1[vBufB] &= ~0x40; | |
233 | } else { | |
234 | via_alt_mapping = 0; | |
235 | } | |
1da177e4 LT |
236 | |
237 | /* | |
238 | * Now initialize VIA2. For RBV we just kill all interrupts; | |
239 | * for a regular VIA we also reset the timers and stuff. | |
240 | */ | |
241 | ||
242 | via2[gIER] = 0x7F; | |
243 | via2[gIFR] = 0x7F | rbv_clear; | |
244 | if (!rbv_present) { | |
245 | via2[vT1LL] = 0; | |
246 | via2[vT1LH] = 0; | |
247 | via2[vT1CL] = 0; | |
248 | via2[vT1CH] = 0; | |
249 | via2[vT2CL] = 0; | |
250 | via2[vT2CH] = 0; | |
4a973592 | 251 | via2[vACR] &= ~0xC0; /* setup T1 timer with no PB7 output */ |
67dfb153 FT |
252 | via2[vACR] &= ~0x03; /* disable port A & B latches */ |
253 | } | |
254 | ||
aa8a9fbe FT |
255 | /* Everything below this point is VIA2 only... */ |
256 | ||
257 | if (rbv_present) | |
258 | return; | |
259 | ||
67dfb153 | 260 | /* |
aa8a9fbe FT |
261 | * Set vPCR for control line interrupts. |
262 | * | |
263 | * CA1 (SLOTS IRQ), CB1 (ASC IRQ): negative edge trigger. | |
264 | * | |
265 | * Macs with ESP SCSI have a negative edge triggered SCSI interrupt. | |
266 | * Testing reveals that PowerBooks do too. However, the SE/30 | |
267 | * schematic diagram shows an active high NCR5380 IRQ line. | |
67dfb153 | 268 | */ |
aa8a9fbe FT |
269 | |
270 | pr_debug("VIA2 vPCR is 0x%02X\n", via2[vPCR]); | |
271 | if (macintosh_config->via_type == MAC_VIA_II) { | |
272 | /* CA2 (SCSI DRQ), CB2 (SCSI IRQ): indep. input, pos. edge */ | |
273 | via2[vPCR] = 0x66; | |
274 | } else { | |
275 | /* CA2 (SCSI DRQ), CB2 (SCSI IRQ): indep. input, neg. edge */ | |
276 | via2[vPCR] = 0x22; | |
1da177e4 LT |
277 | } |
278 | } | |
279 | ||
280 | /* | |
281 | * Start the 100 Hz clock | |
282 | */ | |
283 | ||
40220c1a | 284 | void __init via_init_clock(irq_handler_t func) |
1da177e4 LT |
285 | { |
286 | via1[vACR] |= 0x40; | |
287 | via1[vT1LL] = MAC_CLOCK_LOW; | |
288 | via1[vT1LH] = MAC_CLOCK_HIGH; | |
289 | via1[vT1CL] = MAC_CLOCK_LOW; | |
290 | via1[vT1CH] = MAC_CLOCK_HIGH; | |
291 | ||
5a239453 | 292 | if (request_irq(IRQ_MAC_TIMER_1, func, 0, "timer", func)) |
92c3dd15 | 293 | pr_err("Couldn't register %s interrupt\n", "timer"); |
1da177e4 LT |
294 | } |
295 | ||
1da177e4 LT |
296 | /* |
297 | * Debugging dump, used in various places to see what's going on. | |
298 | */ | |
299 | ||
300 | void via_debug_dump(void) | |
301 | { | |
302 | printk(KERN_DEBUG "VIA1: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n", | |
303 | (uint) via1[vDirA], (uint) via1[vDirB], (uint) via1[vACR]); | |
304 | printk(KERN_DEBUG " PCR = 0x%02X IFR = 0x%02X IER = 0x%02X\n", | |
305 | (uint) via1[vPCR], (uint) via1[vIFR], (uint) via1[vIER]); | |
306 | if (oss_present) { | |
307 | printk(KERN_DEBUG "VIA2: <OSS>\n"); | |
308 | } else if (rbv_present) { | |
309 | printk(KERN_DEBUG "VIA2: IFR = 0x%02X IER = 0x%02X\n", | |
310 | (uint) via2[rIFR], (uint) via2[rIER]); | |
311 | printk(KERN_DEBUG " SIFR = 0x%02X SIER = 0x%02X\n", | |
312 | (uint) via2[rSIFR], (uint) via2[rSIER]); | |
313 | } else { | |
314 | printk(KERN_DEBUG "VIA2: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n", | |
315 | (uint) via2[vDirA], (uint) via2[vDirB], | |
316 | (uint) via2[vACR]); | |
317 | printk(KERN_DEBUG " PCR = 0x%02X IFR = 0x%02X IER = 0x%02X\n", | |
318 | (uint) via2[vPCR], | |
319 | (uint) via2[vIFR], (uint) via2[vIER]); | |
320 | } | |
321 | } | |
322 | ||
323 | /* | |
324 | * This is always executed with interrupts disabled. | |
325 | * | |
326 | * TBI: get time offset between scheduling timer ticks | |
327 | */ | |
328 | ||
c8d5ba18 | 329 | u32 mac_gettimeoffset(void) |
1da177e4 LT |
330 | { |
331 | unsigned long ticks, offset = 0; | |
332 | ||
333 | /* read VIA1 timer 2 current value */ | |
334 | ticks = via1[vT1CL] | (via1[vT1CH] << 8); | |
335 | /* The probability of underflow is less than 2% */ | |
336 | if (ticks > MAC_CLOCK_TICK - MAC_CLOCK_TICK / 50) | |
337 | /* Check for pending timer interrupt in VIA1 IFR */ | |
338 | if (via1[vIFR] & 0x40) offset = TICK_SIZE; | |
339 | ||
340 | ticks = MAC_CLOCK_TICK - ticks; | |
341 | ticks = ticks * 10000L / MAC_CLOCK_TICK; | |
342 | ||
c8d5ba18 | 343 | return (ticks + offset) * 1000; |
1da177e4 LT |
344 | } |
345 | ||
346 | /* | |
347 | * Flush the L2 cache on Macs that have it by flipping | |
348 | * the system into 24-bit mode for an instant. | |
349 | */ | |
350 | ||
351 | void via_flush_cache(void) | |
352 | { | |
353 | via2[gBufB] &= ~VIA2B_vMode32; | |
354 | via2[gBufB] |= VIA2B_vMode32; | |
355 | } | |
356 | ||
357 | /* | |
358 | * Return the status of the L2 cache on a IIci | |
359 | */ | |
360 | ||
361 | int via_get_cache_disable(void) | |
362 | { | |
363 | /* Safeguard against being called accidentally */ | |
364 | if (!via2) { | |
365 | printk(KERN_ERR "via_get_cache_disable called on a non-VIA machine!\n"); | |
366 | return 1; | |
367 | } | |
368 | ||
369 | return (int) via2[gBufB] & VIA2B_vCDis; | |
370 | } | |
371 | ||
372 | /* | |
373 | * Initialize VIA2 for Nubus access | |
374 | */ | |
375 | ||
376 | void __init via_nubus_init(void) | |
377 | { | |
1da177e4 LT |
378 | /* unlock nubus transactions */ |
379 | ||
67dfb153 FT |
380 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && |
381 | (macintosh_config->adb_type != MAC_ADB_PB2)) { | |
1da177e4 | 382 | /* set the line to be an output on non-RBV machines */ |
67dfb153 | 383 | if (!rbv_present) |
1da177e4 | 384 | via2[vDirB] |= 0x02; |
1da177e4 | 385 | |
67dfb153 FT |
386 | /* this seems to be an ADB bit on PMU machines */ |
387 | /* according to MkLinux. -- jmt */ | |
1da177e4 LT |
388 | via2[gBufB] |= 0x02; |
389 | } | |
390 | ||
c4af5da7 FT |
391 | /* |
392 | * Disable the slot interrupts. On some hardware that's not possible. | |
393 | * On some hardware it's unclear what all of these I/O lines do. | |
394 | */ | |
cd713ddc FT |
395 | |
396 | switch (macintosh_config->via_type) { | |
397 | case MAC_VIA_II: | |
c4af5da7 FT |
398 | case MAC_VIA_QUADRA: |
399 | pr_debug("VIA2 vDirA is 0x%02X\n", via2[vDirA]); | |
cd713ddc | 400 | break; |
608e287b | 401 | case MAC_VIA_IICI: |
cd713ddc | 402 | /* RBV. Disable all the slot interrupts. SIER works like IER. */ |
1da177e4 | 403 | via2[rSIER] = 0x7F; |
cd713ddc | 404 | break; |
c4af5da7 FT |
405 | } |
406 | } | |
407 | ||
408 | void via_nubus_irq_startup(int irq) | |
409 | { | |
410 | int irq_idx = IRQ_IDX(irq); | |
411 | ||
412 | switch (macintosh_config->via_type) { | |
413 | case MAC_VIA_II: | |
cd713ddc | 414 | case MAC_VIA_QUADRA: |
c4af5da7 FT |
415 | /* Make the port A line an input. Probably redundant. */ |
416 | if (macintosh_config->via_type == MAC_VIA_II) { | |
417 | /* The top two bits are RAM size outputs. */ | |
418 | via2[vDirA] &= 0xC0 | ~(1 << irq_idx); | |
419 | } else { | |
420 | /* Allow NuBus slots 9 through F. */ | |
421 | via2[vDirA] &= 0x80 | ~(1 << irq_idx); | |
1da177e4 | 422 | } |
c4af5da7 | 423 | /* fall through */ |
608e287b | 424 | case MAC_VIA_IICI: |
c4af5da7 FT |
425 | via_irq_enable(irq); |
426 | break; | |
427 | } | |
428 | } | |
429 | ||
430 | void via_nubus_irq_shutdown(int irq) | |
431 | { | |
432 | switch (macintosh_config->via_type) { | |
433 | case MAC_VIA_II: | |
434 | case MAC_VIA_QUADRA: | |
435 | /* Ensure that the umbrella CA1 interrupt remains enabled. */ | |
436 | via_irq_enable(irq); | |
437 | break; | |
608e287b | 438 | case MAC_VIA_IICI: |
c4af5da7 | 439 | via_irq_disable(irq); |
cd713ddc | 440 | break; |
1da177e4 LT |
441 | } |
442 | } | |
443 | ||
444 | /* | |
445 | * The generic VIA interrupt routines (shamelessly stolen from Alan Cox's | |
446 | * via6522.c :-), disable/pending masks added. | |
1da177e4 LT |
447 | */ |
448 | ||
9145db56 GU |
449 | void via1_irq(unsigned int irq, struct irq_desc *desc) |
450 | { | |
451 | int irq_num; | |
452 | unsigned char irq_bit, events; | |
453 | ||
454 | events = via1[vIFR] & via1[vIER] & 0x7F; | |
455 | if (!events) | |
456 | return; | |
457 | ||
458 | irq_num = VIA1_SOURCE_BASE; | |
459 | irq_bit = 1; | |
460 | do { | |
461 | if (events & irq_bit) { | |
462 | via1[vIFR] = irq_bit; | |
463 | generic_handle_irq(irq_num); | |
464 | } | |
465 | ++irq_num; | |
466 | irq_bit <<= 1; | |
467 | } while (events >= irq_bit); | |
468 | } | |
469 | ||
470 | static void via2_irq(unsigned int irq, struct irq_desc *desc) | |
471 | { | |
472 | int irq_num; | |
473 | unsigned char irq_bit, events; | |
474 | ||
475 | events = via2[gIFR] & via2[gIER] & 0x7F; | |
476 | if (!events) | |
477 | return; | |
478 | ||
479 | irq_num = VIA2_SOURCE_BASE; | |
480 | irq_bit = 1; | |
481 | do { | |
482 | if (events & irq_bit) { | |
483 | via2[gIFR] = irq_bit | rbv_clear; | |
484 | generic_handle_irq(irq_num); | |
485 | } | |
486 | ++irq_num; | |
487 | irq_bit <<= 1; | |
488 | } while (events >= irq_bit); | |
489 | } | |
1da177e4 LT |
490 | |
491 | /* | |
492 | * Dispatch Nubus interrupts. We are called as a secondary dispatch by the | |
493 | * VIA2 dispatcher as a fast interrupt handler. | |
494 | */ | |
495 | ||
9145db56 GU |
496 | void via_nubus_irq(unsigned int irq, struct irq_desc *desc) |
497 | { | |
498 | int slot_irq; | |
499 | unsigned char slot_bit, events; | |
500 | ||
501 | events = ~via2[gBufA] & 0x7F; | |
502 | if (rbv_present) | |
503 | events &= via2[rSIER]; | |
504 | else | |
505 | events &= ~via2[vDirA]; | |
506 | if (!events) | |
507 | return; | |
508 | ||
509 | do { | |
510 | slot_irq = IRQ_NUBUS_F; | |
511 | slot_bit = 0x40; | |
512 | do { | |
513 | if (events & slot_bit) { | |
514 | events &= ~slot_bit; | |
515 | generic_handle_irq(slot_irq); | |
516 | } | |
517 | --slot_irq; | |
518 | slot_bit >>= 1; | |
519 | } while (events); | |
520 | ||
521 | /* clear the CA1 interrupt and make certain there's no more. */ | |
522 | via2[gIFR] = 0x02 | rbv_clear; | |
523 | events = ~via2[gBufA] & 0x7F; | |
524 | if (rbv_present) | |
525 | events &= via2[rSIER]; | |
526 | else | |
527 | events &= ~via2[vDirA]; | |
528 | } while (events); | |
529 | } | |
9145db56 GU |
530 | |
531 | /* | |
532 | * Register the interrupt dispatchers for VIA or RBV machines only. | |
533 | */ | |
534 | ||
535 | void __init via_register_interrupts(void) | |
536 | { | |
9145db56 GU |
537 | if (via_alt_mapping) { |
538 | /* software interrupt */ | |
539 | irq_set_chained_handler(IRQ_AUTO_1, via1_irq); | |
540 | /* via1 interrupt */ | |
541 | irq_set_chained_handler(IRQ_AUTO_6, via1_irq); | |
542 | } else { | |
543 | irq_set_chained_handler(IRQ_AUTO_1, via1_irq); | |
544 | } | |
545 | irq_set_chained_handler(IRQ_AUTO_2, via2_irq); | |
546 | irq_set_chained_handler(IRQ_MAC_NUBUS, via_nubus_irq); | |
9145db56 | 547 | } |
1da177e4 LT |
548 | |
549 | void via_irq_enable(int irq) { | |
550 | int irq_src = IRQ_SRC(irq); | |
551 | int irq_idx = IRQ_IDX(irq); | |
1da177e4 LT |
552 | |
553 | #ifdef DEBUG_IRQUSE | |
554 | printk(KERN_DEBUG "via_irq_enable(%d)\n", irq); | |
555 | #endif | |
556 | ||
557 | if (irq_src == 1) { | |
cd713ddc | 558 | via1[vIER] = IER_SET_BIT(irq_idx); |
1da177e4 | 559 | } else if (irq_src == 2) { |
cd713ddc FT |
560 | if (irq != IRQ_MAC_NUBUS || nubus_disabled == 0) |
561 | via2[gIER] = IER_SET_BIT(irq_idx); | |
1da177e4 | 562 | } else if (irq_src == 7) { |
cd713ddc FT |
563 | switch (macintosh_config->via_type) { |
564 | case MAC_VIA_II: | |
c4af5da7 | 565 | case MAC_VIA_QUADRA: |
cd713ddc FT |
566 | nubus_disabled &= ~(1 << irq_idx); |
567 | /* Enable the CA1 interrupt when no slot is disabled. */ | |
568 | if (!nubus_disabled) | |
569 | via2[gIER] = IER_SET_BIT(1); | |
570 | break; | |
608e287b | 571 | case MAC_VIA_IICI: |
cd713ddc FT |
572 | /* On RBV, enable the slot interrupt. |
573 | * SIER works like IER. | |
574 | */ | |
1da177e4 | 575 | via2[rSIER] = IER_SET_BIT(irq_idx); |
cd713ddc | 576 | break; |
1da177e4 | 577 | } |
1da177e4 LT |
578 | } |
579 | } | |
580 | ||
581 | void via_irq_disable(int irq) { | |
582 | int irq_src = IRQ_SRC(irq); | |
583 | int irq_idx = IRQ_IDX(irq); | |
1da177e4 LT |
584 | |
585 | #ifdef DEBUG_IRQUSE | |
586 | printk(KERN_DEBUG "via_irq_disable(%d)\n", irq); | |
587 | #endif | |
588 | ||
589 | if (irq_src == 1) { | |
cd713ddc | 590 | via1[vIER] = IER_CLR_BIT(irq_idx); |
1da177e4 | 591 | } else if (irq_src == 2) { |
cd713ddc | 592 | via2[gIER] = IER_CLR_BIT(irq_idx); |
1da177e4 | 593 | } else if (irq_src == 7) { |
cd713ddc FT |
594 | switch (macintosh_config->via_type) { |
595 | case MAC_VIA_II: | |
c4af5da7 | 596 | case MAC_VIA_QUADRA: |
cd713ddc FT |
597 | nubus_disabled |= 1 << irq_idx; |
598 | if (nubus_disabled) | |
599 | via2[gIER] = IER_CLR_BIT(1); | |
600 | break; | |
608e287b | 601 | case MAC_VIA_IICI: |
1da177e4 | 602 | via2[rSIER] = IER_CLR_BIT(irq_idx); |
cd713ddc | 603 | break; |
1da177e4 | 604 | } |
1da177e4 LT |
605 | } |
606 | } | |
607 | ||
8852ecd9 LV |
608 | void via1_set_head(int head) |
609 | { | |
610 | if (head == 0) | |
611 | via1[vBufA] &= ~VIA1A_vHeadSel; | |
612 | else | |
613 | via1[vBufA] |= VIA1A_vHeadSel; | |
614 | } | |
615 | EXPORT_SYMBOL(via1_set_head); | |
30c0527d FT |
616 | |
617 | int via2_scsi_drq_pending(void) | |
618 | { | |
619 | return via2[gIFR] & (1 << IRQ_IDX(IRQ_MAC_SCSIDRQ)); | |
620 | } | |
621 | EXPORT_SYMBOL(via2_scsi_drq_pending); |