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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / arch / mips / sgi-ip22 / ip22-int.c
blobf6d9bf4b26e7fdcda9cc336f83a5e87a5f10e2c5
1 /*
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 */
12 #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 #include <asm/irq_cpu.h>
23 #include <asm/sgi/ioc.h>
24 #include <asm/sgi/hpc3.h>
25 #include <asm/sgi/ip22.h>
26 #include <asm/time.h>
27
28 /* #define DEBUG_SGINT */
29
30 /* So far nothing hangs here */
31 #undef USE_LIO3_IRQ
32
33 struct sgint_regs *sgint;
34
35 static char lc0msk_to_irqnr[256];
36 static char lc1msk_to_irqnr[256];
37 static char lc2msk_to_irqnr[256];
38 static char lc3msk_to_irqnr[256];
39
40 extern int ip22_eisa_init(void);
41
42 static void enable_local0_irq(unsigned int irq)
43 {
44 /* don't allow mappable interrupt to be enabled from setup_irq,
45 * we have our own way to do so */
46 if (irq != SGI_MAP_0_IRQ)
47 sgint->imask0 |= (1 << (irq - SGINT_LOCAL0));
48 }
49
50 static void disable_local0_irq(unsigned int irq)
51 {
52 sgint->imask0 &= ~(1 << (irq - SGINT_LOCAL0));
53 }
54
55 static struct irq_chip ip22_local0_irq_type = {
56 .name = "IP22 local 0",
57 .ack = disable_local0_irq,
58 .mask = disable_local0_irq,
59 .mask_ack = disable_local0_irq,
60 .unmask = enable_local0_irq,
61 };
62
63 static void enable_local1_irq(unsigned int irq)
64 {
65 /* don't allow mappable interrupt to be enabled from setup_irq,
66 * we have our own way to do so */
67 if (irq != SGI_MAP_1_IRQ)
68 sgint->imask1 |= (1 << (irq - SGINT_LOCAL1));
69 }
70
71 void disable_local1_irq(unsigned int irq)
72 {
73 sgint->imask1 &= ~(1 << (irq - SGINT_LOCAL1));
74 }
75
76 static struct irq_chip ip22_local1_irq_type = {
77 .name = "IP22 local 1",
78 .ack = disable_local1_irq,
79 .mask = disable_local1_irq,
80 .mask_ack = disable_local1_irq,
81 .unmask = enable_local1_irq,
82 };
83
84 static void enable_local2_irq(unsigned int irq)
85 {
86 sgint->imask0 |= (1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0));
87 sgint->cmeimask0 |= (1 << (irq - SGINT_LOCAL2));
88 }
89
90 void disable_local2_irq(unsigned int irq)
91 {
92 sgint->cmeimask0 &= ~(1 << (irq - SGINT_LOCAL2));
93 if (!sgint->cmeimask0)
94 sgint->imask0 &= ~(1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0));
95 }
96
97 static struct irq_chip ip22_local2_irq_type = {
98 .name = "IP22 local 2",
99 .ack = disable_local2_irq,
100 .mask = disable_local2_irq,
101 .mask_ack = disable_local2_irq,
102 .unmask = enable_local2_irq,
103 };
104
105 static void enable_local3_irq(unsigned int irq)
106 {
107 sgint->imask1 |= (1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1));
108 sgint->cmeimask1 |= (1 << (irq - SGINT_LOCAL3));
109 }
110
111 void disable_local3_irq(unsigned int irq)
112 {
113 sgint->cmeimask1 &= ~(1 << (irq - SGINT_LOCAL3));
114 if (!sgint->cmeimask1)
115 sgint->imask1 &= ~(1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1));
116 }
117
118 static struct irq_chip ip22_local3_irq_type = {
119 .name = "IP22 local 3",
120 .ack = disable_local3_irq,
121 .mask = disable_local3_irq,
122 .mask_ack = disable_local3_irq,
123 .unmask = enable_local3_irq,
124 };
125
126 static void indy_local0_irqdispatch(void)
127 {
128 u8 mask = sgint->istat0 & sgint->imask0;
129 u8 mask2;
130 int irq;
131
132 if (mask & SGINT_ISTAT0_LIO2) {
133 mask2 = sgint->vmeistat & sgint->cmeimask0;
134 irq = lc2msk_to_irqnr[mask2];
135 } else
136 irq = lc0msk_to_irqnr[mask];
137
138 /* if irq == 0, then the interrupt has already been cleared */
139 if (irq)
140 do_IRQ(irq);
141 }
142
143 static void indy_local1_irqdispatch(void)
144 {
145 u8 mask = sgint->istat1 & sgint->imask1;
146 u8 mask2;
147 int irq;
148
149 if (mask & SGINT_ISTAT1_LIO3) {
150 mask2 = sgint->vmeistat & sgint->cmeimask1;
151 irq = lc3msk_to_irqnr[mask2];
152 } else
153 irq = lc1msk_to_irqnr[mask];
154
155 /* if irq == 0, then the interrupt has already been cleared */
156 if (irq)
157 do_IRQ(irq);
158 }
159
160 extern void ip22_be_interrupt(int irq);
161
162 static void indy_buserror_irq(void)
163 {
164 int irq = SGI_BUSERR_IRQ;
165
166 irq_enter();
167 kstat_this_cpu.irqs[irq]++;
168 ip22_be_interrupt(irq);
169 irq_exit();
170 }
171
172 static struct irqaction local0_cascade = {
173 .handler = no_action,
174 .flags = IRQF_DISABLED,
175 .name = "local0 cascade",
176 };
177
178 static struct irqaction local1_cascade = {
179 .handler = no_action,
180 .flags = IRQF_DISABLED,
181 .name = "local1 cascade",
182 };
183
184 static struct irqaction buserr = {
185 .handler = no_action,
186 .flags = IRQF_DISABLED,
187 .name = "Bus Error",
188 };
189
190 static struct irqaction map0_cascade = {
191 .handler = no_action,
192 .flags = IRQF_DISABLED,
193 .name = "mapable0 cascade",
194 };
195
196 #ifdef USE_LIO3_IRQ
197 static struct irqaction map1_cascade = {
198 .handler = no_action,
199 .flags = IRQF_DISABLED,
200 .name = "mapable1 cascade",
201 };
202 #define SGI_INTERRUPTS SGINT_END
203 #else
204 #define SGI_INTERRUPTS SGINT_LOCAL3
205 #endif
206
207 extern void indy_8254timer_irq(void);
208
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
237 asmlinkage void plat_irq_dispatch(void)
238 {
239 unsigned int pending = read_c0_status() & read_c0_cause();
240
241 /*
242 * First we check for r4k counter/timer IRQ.
243 */
244 if (pending & CAUSEF_IP7)
245 do_IRQ(SGI_TIMER_IRQ);
246 else if (pending & CAUSEF_IP2)
247 indy_local0_irqdispatch();
248 else if (pending & CAUSEF_IP3)
249 indy_local1_irqdispatch();
250 else if (pending & CAUSEF_IP6)
251 indy_buserror_irq();
252 else if (pending & (CAUSEF_IP4 | CAUSEF_IP5))
253 indy_8254timer_irq();
254 }
255
256 void __init arch_init_irq(void)
257 {
258 int i;
259
260 /* Init local mask --> irq tables. */
261 for (i = 0; i < 256; i++) {
262 if (i & 0x80) {
263 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 7;
264 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 7;
265 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 7;
266 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 7;
267 } else if (i & 0x40) {
268 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 6;
269 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 6;
270 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 6;
271 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 6;
272 } else if (i & 0x20) {
273 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 5;
274 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 5;
275 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 5;
276 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 5;
277 } else if (i & 0x10) {
278 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 4;
279 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 4;
280 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 4;
281 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 4;
282 } else if (i & 0x08) {
283 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 3;
284 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 3;
285 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 3;
286 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 3;
287 } else if (i & 0x04) {
288 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 2;
289 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 2;
290 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 2;
291 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 2;
292 } else if (i & 0x02) {
293 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 1;
294 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 1;
295 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 1;
296 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 1;
297 } else if (i & 0x01) {
298 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 0;
299 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 0;
300 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 0;
301 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 0;
302 } else {
303 lc0msk_to_irqnr[i] = 0;
304 lc1msk_to_irqnr[i] = 0;
305 lc2msk_to_irqnr[i] = 0;
306 lc3msk_to_irqnr[i] = 0;
307 }
308 }
309
310 /* Mask out all interrupts. */
311 sgint->imask0 = 0;
312 sgint->imask1 = 0;
313 sgint->cmeimask0 = 0;
314 sgint->cmeimask1 = 0;
315
316 /* init CPU irqs */
317 mips_cpu_irq_init();
318
319 for (i = SGINT_LOCAL0; i < SGI_INTERRUPTS; i++) {
320 struct irq_chip *handler;
321
322 if (i < SGINT_LOCAL1)
323 handler = &ip22_local0_irq_type;
324 else if (i < SGINT_LOCAL2)
325 handler = &ip22_local1_irq_type;
326 else if (i < SGINT_LOCAL3)
327 handler = &ip22_local2_irq_type;
328 else
329 handler = &ip22_local3_irq_type;
330
331 set_irq_chip_and_handler(i, handler, handle_level_irq);
332 }
333
334 /* vector handler. this register the IRQ as non-sharable */
335 setup_irq(SGI_LOCAL_0_IRQ, &local0_cascade);
336 setup_irq(SGI_LOCAL_1_IRQ, &local1_cascade);
337 setup_irq(SGI_BUSERR_IRQ, &buserr);
338
339 /* cascade in cascade. i love Indy ;-) */
340 setup_irq(SGI_MAP_0_IRQ, &map0_cascade);
341 #ifdef USE_LIO3_IRQ
342 setup_irq(SGI_MAP_1_IRQ, &map1_cascade);
343 #endif
344
345 #ifdef CONFIG_EISA
346 if (ip22_is_fullhouse()) /* Only Indigo-2 has EISA stuff */
347 ip22_eisa_init();
348 #endif
349 }
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