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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * ip22-int.c: Routines for generic manipulation of the INT[23] ASIC
3 * found on INDY and Indigo2 workstations.
4 *
5 * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
6 * Copyright (C) 1997, 1998 Ralf Baechle (ralf@gnu.org)
7 * Copyright (C) 1999 Andrew R. Baker (andrewb@uab.edu)
8 * - Indigo2 changes
9 * - Interrupt handling fixes
10 * Copyright (C) 2001, 2003 Ladislav Michl (ladis@linux-mips.org)
11 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/types.h>
13#include <linux/init.h>
14#include <linux/kernel_stat.h>
15#include <linux/signal.h>
16#include <linux/sched.h>
17#include <linux/interrupt.h>
18#include <linux/irq.h>
19
20#include <asm/mipsregs.h>
21#include <asm/addrspace.h>
22
23#include <asm/sgi/ioc.h>
24#include <asm/sgi/hpc3.h>
25#include <asm/sgi/ip22.h>
26
27/* #define DEBUG_SGINT */
28
29/* So far nothing hangs here */
Ralf Baechle42a3b4f2005-09-03 15:56:17 -070030#undef USE_LIO3_IRQ
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
32struct sgint_regs *sgint;
33
34static char lc0msk_to_irqnr[256];
35static char lc1msk_to_irqnr[256];
36static char lc2msk_to_irqnr[256];
37static char lc3msk_to_irqnr[256];
38
Linus Torvalds1da177e2005-04-16 15:20:36 -070039extern int ip22_eisa_init(void);
40
41static void enable_local0_irq(unsigned int irq)
42{
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 /* don't allow mappable interrupt to be enabled from setup_irq,
44 * we have our own way to do so */
45 if (irq != SGI_MAP_0_IRQ)
46 sgint->imask0 |= (1 << (irq - SGINT_LOCAL0));
Linus Torvalds1da177e2005-04-16 15:20:36 -070047}
48
49static void disable_local0_irq(unsigned int irq)
50{
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 sgint->imask0 &= ~(1 << (irq - SGINT_LOCAL0));
Linus Torvalds1da177e2005-04-16 15:20:36 -070052}
53
Ralf Baechle94dee172006-07-02 14:41:42 +010054static struct irq_chip ip22_local0_irq_type = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 .typename = "IP22 local 0",
Atsushi Nemoto1603b5a2006-11-02 02:08:36 +090056 .ack = disable_local0_irq,
57 .mask = disable_local0_irq,
58 .mask_ack = disable_local0_irq,
59 .unmask = enable_local0_irq,
Linus Torvalds1da177e2005-04-16 15:20:36 -070060};
61
62static void enable_local1_irq(unsigned int irq)
63{
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 /* don't allow mappable interrupt to be enabled from setup_irq,
65 * we have our own way to do so */
66 if (irq != SGI_MAP_1_IRQ)
67 sgint->imask1 |= (1 << (irq - SGINT_LOCAL1));
Linus Torvalds1da177e2005-04-16 15:20:36 -070068}
69
70void disable_local1_irq(unsigned int irq)
71{
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 sgint->imask1 &= ~(1 << (irq - SGINT_LOCAL1));
Linus Torvalds1da177e2005-04-16 15:20:36 -070073}
74
Ralf Baechle94dee172006-07-02 14:41:42 +010075static struct irq_chip ip22_local1_irq_type = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 .typename = "IP22 local 1",
Atsushi Nemoto1603b5a2006-11-02 02:08:36 +090077 .ack = disable_local1_irq,
78 .mask = disable_local1_irq,
79 .mask_ack = disable_local1_irq,
80 .unmask = enable_local1_irq,
Linus Torvalds1da177e2005-04-16 15:20:36 -070081};
82
83static void enable_local2_irq(unsigned int irq)
84{
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 sgint->imask0 |= (1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0));
86 sgint->cmeimask0 |= (1 << (irq - SGINT_LOCAL2));
Linus Torvalds1da177e2005-04-16 15:20:36 -070087}
88
89void disable_local2_irq(unsigned int irq)
90{
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 sgint->cmeimask0 &= ~(1 << (irq - SGINT_LOCAL2));
92 if (!sgint->cmeimask0)
93 sgint->imask0 &= ~(1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0));
Linus Torvalds1da177e2005-04-16 15:20:36 -070094}
95
Ralf Baechle94dee172006-07-02 14:41:42 +010096static struct irq_chip ip22_local2_irq_type = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 .typename = "IP22 local 2",
Atsushi Nemoto1603b5a2006-11-02 02:08:36 +090098 .ack = disable_local2_irq,
99 .mask = disable_local2_irq,
100 .mask_ack = disable_local2_irq,
101 .unmask = enable_local2_irq,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102};
103
104static void enable_local3_irq(unsigned int irq)
105{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 sgint->imask1 |= (1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1));
107 sgint->cmeimask1 |= (1 << (irq - SGINT_LOCAL3));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108}
109
110void disable_local3_irq(unsigned int irq)
111{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 sgint->cmeimask1 &= ~(1 << (irq - SGINT_LOCAL3));
113 if (!sgint->cmeimask1)
114 sgint->imask1 &= ~(1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115}
116
Ralf Baechle94dee172006-07-02 14:41:42 +0100117static struct irq_chip ip22_local3_irq_type = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 .typename = "IP22 local 3",
Atsushi Nemoto1603b5a2006-11-02 02:08:36 +0900119 .ack = disable_local3_irq,
120 .mask = disable_local3_irq,
121 .mask_ack = disable_local3_irq,
122 .unmask = enable_local3_irq,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123};
124
Ralf Baechle937a8012006-10-07 19:44:33 +0100125static void indy_local0_irqdispatch(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126{
127 u8 mask = sgint->istat0 & sgint->imask0;
128 u8 mask2;
129 int irq;
130
131 if (mask & SGINT_ISTAT0_LIO2) {
132 mask2 = sgint->vmeistat & sgint->cmeimask0;
133 irq = lc2msk_to_irqnr[mask2];
134 } else
135 irq = lc0msk_to_irqnr[mask];
136
137 /* if irq == 0, then the interrupt has already been cleared */
138 if (irq)
Ralf Baechle937a8012006-10-07 19:44:33 +0100139 do_IRQ(irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140}
141
Ralf Baechle937a8012006-10-07 19:44:33 +0100142static void indy_local1_irqdispatch(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143{
144 u8 mask = sgint->istat1 & sgint->imask1;
145 u8 mask2;
146 int irq;
147
148 if (mask & SGINT_ISTAT1_LIO3) {
149 mask2 = sgint->vmeistat & sgint->cmeimask1;
150 irq = lc3msk_to_irqnr[mask2];
151 } else
152 irq = lc1msk_to_irqnr[mask];
153
154 /* if irq == 0, then the interrupt has already been cleared */
155 if (irq)
Ralf Baechle937a8012006-10-07 19:44:33 +0100156 do_IRQ(irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157}
158
Ralf Baechle937a8012006-10-07 19:44:33 +0100159extern void ip22_be_interrupt(int irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
Ralf Baechle937a8012006-10-07 19:44:33 +0100161static void indy_buserror_irq(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162{
163 int irq = SGI_BUSERR_IRQ;
164
165 irq_enter();
166 kstat_this_cpu.irqs[irq]++;
Ralf Baechle937a8012006-10-07 19:44:33 +0100167 ip22_be_interrupt(irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 irq_exit();
169}
170
Ralf Baechle42a3b4f2005-09-03 15:56:17 -0700171static struct irqaction local0_cascade = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 .handler = no_action,
Thomas Gleixnerf40298f2006-07-01 19:29:20 -0700173 .flags = IRQF_DISABLED,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 .name = "local0 cascade",
175};
176
Ralf Baechle42a3b4f2005-09-03 15:56:17 -0700177static struct irqaction local1_cascade = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 .handler = no_action,
Thomas Gleixnerf40298f2006-07-01 19:29:20 -0700179 .flags = IRQF_DISABLED,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 .name = "local1 cascade",
181};
182
Ralf Baechle42a3b4f2005-09-03 15:56:17 -0700183static struct irqaction buserr = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 .handler = no_action,
Thomas Gleixnerf40298f2006-07-01 19:29:20 -0700185 .flags = IRQF_DISABLED,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 .name = "Bus Error",
187};
188
Ralf Baechle42a3b4f2005-09-03 15:56:17 -0700189static struct irqaction map0_cascade = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 .handler = no_action,
Thomas Gleixnerf40298f2006-07-01 19:29:20 -0700191 .flags = IRQF_DISABLED,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 .name = "mapable0 cascade",
193};
194
195#ifdef USE_LIO3_IRQ
Ralf Baechle42a3b4f2005-09-03 15:56:17 -0700196static struct irqaction map1_cascade = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 .handler = no_action,
Thomas Gleixnerf40298f2006-07-01 19:29:20 -0700198 .flags = IRQF_DISABLED,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 .name = "mapable1 cascade",
200};
201#define SGI_INTERRUPTS SGINT_END
202#else
203#define SGI_INTERRUPTS SGINT_LOCAL3
204#endif
205
Ralf Baechle937a8012006-10-07 19:44:33 +0100206extern void indy_r4k_timer_interrupt(void);
207extern void indy_8254timer_irq(void);
Ralf Baechlee4ac58a2006-04-03 17:56:36 +0100208
209/*
210 * IRQs on the INDY look basically (barring software IRQs which we don't use
211 * at all) like:
212 *
213 * MIPS IRQ Source
214 * -------- ------
215 * 0 Software (ignored)
216 * 1 Software (ignored)
217 * 2 Local IRQ level zero
218 * 3 Local IRQ level one
219 * 4 8254 Timer zero
220 * 5 8254 Timer one
221 * 6 Bus Error
222 * 7 R4k timer (what we use)
223 *
224 * We handle the IRQ according to _our_ priority which is:
225 *
226 * Highest ---- R4k Timer
227 * Local IRQ zero
228 * Local IRQ one
229 * Bus Error
230 * 8254 Timer zero
231 * Lowest ---- 8254 Timer one
232 *
233 * then we just return, if multiple IRQs are pending then we will just take
234 * another exception, big deal.
235 */
236
Ralf Baechle937a8012006-10-07 19:44:33 +0100237asmlinkage void plat_irq_dispatch(void)
Ralf Baechlee4ac58a2006-04-03 17:56:36 +0100238{
239 unsigned int pending = read_c0_cause();
240
241 /*
242 * First we check for r4k counter/timer IRQ.
243 */
244 if (pending & CAUSEF_IP7)
Ralf Baechle937a8012006-10-07 19:44:33 +0100245 indy_r4k_timer_interrupt();
Ralf Baechlee4ac58a2006-04-03 17:56:36 +0100246 else if (pending & CAUSEF_IP2)
Ralf Baechle937a8012006-10-07 19:44:33 +0100247 indy_local0_irqdispatch();
Ralf Baechlee4ac58a2006-04-03 17:56:36 +0100248 else if (pending & CAUSEF_IP3)
Ralf Baechle937a8012006-10-07 19:44:33 +0100249 indy_local1_irqdispatch();
Ralf Baechlee4ac58a2006-04-03 17:56:36 +0100250 else if (pending & CAUSEF_IP6)
Ralf Baechle937a8012006-10-07 19:44:33 +0100251 indy_buserror_irq();
Ralf Baechlee4ac58a2006-04-03 17:56:36 +0100252 else if (pending & (CAUSEF_IP4 | CAUSEF_IP5))
Ralf Baechle937a8012006-10-07 19:44:33 +0100253 indy_8254timer_irq();
Ralf Baechlee4ac58a2006-04-03 17:56:36 +0100254}
255
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256extern void mips_cpu_irq_init(unsigned int irq_base);
257
258void __init arch_init_irq(void)
259{
260 int i;
261
262 /* Init local mask --> irq tables. */
263 for (i = 0; i < 256; i++) {
264 if (i & 0x80) {
265 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 7;
266 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 7;
267 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 7;
268 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 7;
269 } else if (i & 0x40) {
270 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 6;
271 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 6;
272 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 6;
273 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 6;
274 } else if (i & 0x20) {
275 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 5;
276 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 5;
277 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 5;
278 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 5;
279 } else if (i & 0x10) {
280 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 4;
281 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 4;
282 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 4;
283 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 4;
284 } else if (i & 0x08) {
285 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 3;
286 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 3;
287 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 3;
288 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 3;
289 } else if (i & 0x04) {
290 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 2;
291 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 2;
292 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 2;
293 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 2;
294 } else if (i & 0x02) {
295 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 1;
296 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 1;
297 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 1;
298 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 1;
299 } else if (i & 0x01) {
300 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 0;
301 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 0;
302 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 0;
303 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 0;
304 } else {
305 lc0msk_to_irqnr[i] = 0;
306 lc1msk_to_irqnr[i] = 0;
307 lc2msk_to_irqnr[i] = 0;
308 lc3msk_to_irqnr[i] = 0;
309 }
310 }
311
312 /* Mask out all interrupts. */
313 sgint->imask0 = 0;
314 sgint->imask1 = 0;
315 sgint->cmeimask0 = 0;
316 sgint->cmeimask1 = 0;
317
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 /* init CPU irqs */
319 mips_cpu_irq_init(SGINT_CPU);
320
321 for (i = SGINT_LOCAL0; i < SGI_INTERRUPTS; i++) {
Ralf Baechle94dee172006-07-02 14:41:42 +0100322 struct irq_chip *handler;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
324 if (i < SGINT_LOCAL1)
325 handler = &ip22_local0_irq_type;
326 else if (i < SGINT_LOCAL2)
327 handler = &ip22_local1_irq_type;
328 else if (i < SGINT_LOCAL3)
329 handler = &ip22_local2_irq_type;
330 else
331 handler = &ip22_local3_irq_type;
332
Atsushi Nemoto14178362006-11-14 01:13:18 +0900333 set_irq_chip_and_handler(i, handler, handle_level_irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 }
335
336 /* vector handler. this register the IRQ as non-sharable */
337 setup_irq(SGI_LOCAL_0_IRQ, &local0_cascade);
338 setup_irq(SGI_LOCAL_1_IRQ, &local1_cascade);
339 setup_irq(SGI_BUSERR_IRQ, &buserr);
340
341 /* cascade in cascade. i love Indy ;-) */
342 setup_irq(SGI_MAP_0_IRQ, &map0_cascade);
343#ifdef USE_LIO3_IRQ
344 setup_irq(SGI_MAP_1_IRQ, &map1_cascade);
345#endif
346
347#ifdef CONFIG_EISA
348 if (ip22_is_fullhouse()) /* Only Indigo-2 has EISA stuff */
349 ip22_eisa_init ();
350#endif
351}