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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[linux/fpc-iii.git] / arch / mips / sgi-ip22 / ip22-int.c
blob3db64d51798ddb4afd1fd3893a270c954db0a921
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 (davem@davemloft.net)
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/interrupt.h>
16 #include <linux/ftrace.h>
17
18 #include <asm/irq_cpu.h>
19 #include <asm/sgi/hpc3.h>
20 #include <asm/sgi/ip22.h>
21
22 /* So far nothing hangs here */
23 #undef USE_LIO3_IRQ
24
25 struct sgint_regs *sgint;
26
27 static char lc0msk_to_irqnr[256];
28 static char lc1msk_to_irqnr[256];
29 static char lc2msk_to_irqnr[256];
30 static char lc3msk_to_irqnr[256];
31
32 extern int ip22_eisa_init(void);
33
34 static void enable_local0_irq(struct irq_data *d)
35 {
36 /* don't allow mappable interrupt to be enabled from setup_irq,
37 * we have our own way to do so */
38 if (d->irq != SGI_MAP_0_IRQ)
39 sgint->imask0 |= (1 << (d->irq - SGINT_LOCAL0));
40 }
41
42 static void disable_local0_irq(struct irq_data *d)
43 {
44 sgint->imask0 &= ~(1 << (d->irq - SGINT_LOCAL0));
45 }
46
47 static struct irq_chip ip22_local0_irq_type = {
48 .name = "IP22 local 0",
49 .irq_mask = disable_local0_irq,
50 .irq_unmask = enable_local0_irq,
51 };
52
53 static void enable_local1_irq(struct irq_data *d)
54 {
55 /* don't allow mappable interrupt to be enabled from setup_irq,
56 * we have our own way to do so */
57 if (d->irq != SGI_MAP_1_IRQ)
58 sgint->imask1 |= (1 << (d->irq - SGINT_LOCAL1));
59 }
60
61 static void disable_local1_irq(struct irq_data *d)
62 {
63 sgint->imask1 &= ~(1 << (d->irq - SGINT_LOCAL1));
64 }
65
66 static struct irq_chip ip22_local1_irq_type = {
67 .name = "IP22 local 1",
68 .irq_mask = disable_local1_irq,
69 .irq_unmask = enable_local1_irq,
70 };
71
72 static void enable_local2_irq(struct irq_data *d)
73 {
74 sgint->imask0 |= (1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0));
75 sgint->cmeimask0 |= (1 << (d->irq - SGINT_LOCAL2));
76 }
77
78 static void disable_local2_irq(struct irq_data *d)
79 {
80 sgint->cmeimask0 &= ~(1 << (d->irq - SGINT_LOCAL2));
81 if (!sgint->cmeimask0)
82 sgint->imask0 &= ~(1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0));
83 }
84
85 static struct irq_chip ip22_local2_irq_type = {
86 .name = "IP22 local 2",
87 .irq_mask = disable_local2_irq,
88 .irq_unmask = enable_local2_irq,
89 };
90
91 static void enable_local3_irq(struct irq_data *d)
92 {
93 sgint->imask1 |= (1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1));
94 sgint->cmeimask1 |= (1 << (d->irq - SGINT_LOCAL3));
95 }
96
97 static void disable_local3_irq(struct irq_data *d)
98 {
99 sgint->cmeimask1 &= ~(1 << (d->irq - SGINT_LOCAL3));
100 if (!sgint->cmeimask1)
101 sgint->imask1 &= ~(1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1));
102 }
103
104 static struct irq_chip ip22_local3_irq_type = {
105 .name = "IP22 local 3",
106 .irq_mask = disable_local3_irq,
107 .irq_unmask = enable_local3_irq,
108 };
109
110 static void indy_local0_irqdispatch(void)
111 {
112 u8 mask = sgint->istat0 & sgint->imask0;
113 u8 mask2;
114 int irq;
115
116 if (mask & SGINT_ISTAT0_LIO2) {
117 mask2 = sgint->vmeistat & sgint->cmeimask0;
118 irq = lc2msk_to_irqnr[mask2];
119 } else
120 irq = lc0msk_to_irqnr[mask];
121
122 /* if irq == 0, then the interrupt has already been cleared */
123 if (irq)
124 do_IRQ(irq);
125 }
126
127 static void indy_local1_irqdispatch(void)
128 {
129 u8 mask = sgint->istat1 & sgint->imask1;
130 u8 mask2;
131 int irq;
132
133 if (mask & SGINT_ISTAT1_LIO3) {
134 mask2 = sgint->vmeistat & sgint->cmeimask1;
135 irq = lc3msk_to_irqnr[mask2];
136 } else
137 irq = lc1msk_to_irqnr[mask];
138
139 /* if irq == 0, then the interrupt has already been cleared */
140 if (irq)
141 do_IRQ(irq);
142 }
143
144 extern void ip22_be_interrupt(int irq);
145
146 static void __irq_entry indy_buserror_irq(void)
147 {
148 int irq = SGI_BUSERR_IRQ;
149
150 irq_enter();
151 kstat_incr_irqs_this_cpu(irq, irq_to_desc(irq));
152 ip22_be_interrupt(irq);
153 irq_exit();
154 }
155
156 static struct irqaction local0_cascade = {
157 .handler = no_action,
158 .flags = IRQF_NO_THREAD,
159 .name = "local0 cascade",
160 };
161
162 static struct irqaction local1_cascade = {
163 .handler = no_action,
164 .flags = IRQF_NO_THREAD,
165 .name = "local1 cascade",
166 };
167
168 static struct irqaction buserr = {
169 .handler = no_action,
170 .flags = IRQF_NO_THREAD,
171 .name = "Bus Error",
172 };
173
174 static struct irqaction map0_cascade = {
175 .handler = no_action,
176 .flags = IRQF_NO_THREAD,
177 .name = "mapable0 cascade",
178 };
179
180 #ifdef USE_LIO3_IRQ
181 static struct irqaction map1_cascade = {
182 .handler = no_action,
183 .flags = IRQF_NO_THREAD,
184 .name = "mapable1 cascade",
185 };
186 #define SGI_INTERRUPTS SGINT_END
187 #else
188 #define SGI_INTERRUPTS SGINT_LOCAL3
189 #endif
190
191 extern void indy_8254timer_irq(void);
192
193 /*
194 * IRQs on the INDY look basically (barring software IRQs which we don't use
195 * at all) like:
196 *
197 * MIPS IRQ Source
198 * -------- ------
199 * 0 Software (ignored)
200 * 1 Software (ignored)
201 * 2 Local IRQ level zero
202 * 3 Local IRQ level one
203 * 4 8254 Timer zero
204 * 5 8254 Timer one
205 * 6 Bus Error
206 * 7 R4k timer (what we use)
207 *
208 * We handle the IRQ according to _our_ priority which is:
209 *
210 * Highest ---- R4k Timer
211 * Local IRQ zero
212 * Local IRQ one
213 * Bus Error
214 * 8254 Timer zero
215 * Lowest ---- 8254 Timer one
216 *
217 * then we just return, if multiple IRQs are pending then we will just take
218 * another exception, big deal.
219 */
220
221 asmlinkage void plat_irq_dispatch(void)
222 {
223 unsigned int pending = read_c0_status() & read_c0_cause();
224
225 /*
226 * First we check for r4k counter/timer IRQ.
227 */
228 if (pending & CAUSEF_IP7)
229 do_IRQ(SGI_TIMER_IRQ);
230 else if (pending & CAUSEF_IP2)
231 indy_local0_irqdispatch();
232 else if (pending & CAUSEF_IP3)
233 indy_local1_irqdispatch();
234 else if (pending & CAUSEF_IP6)
235 indy_buserror_irq();
236 else if (pending & (CAUSEF_IP4 | CAUSEF_IP5))
237 indy_8254timer_irq();
238 }
239
240 void __init arch_init_irq(void)
241 {
242 int i;
243
244 /* Init local mask --> irq tables. */
245 for (i = 0; i < 256; i++) {
246 if (i & 0x80) {
247 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 7;
248 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 7;
249 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 7;
250 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 7;
251 } else if (i & 0x40) {
252 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 6;
253 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 6;
254 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 6;
255 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 6;
256 } else if (i & 0x20) {
257 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 5;
258 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 5;
259 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 5;
260 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 5;
261 } else if (i & 0x10) {
262 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 4;
263 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 4;
264 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 4;
265 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 4;
266 } else if (i & 0x08) {
267 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 3;
268 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 3;
269 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 3;
270 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 3;
271 } else if (i & 0x04) {
272 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 2;
273 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 2;
274 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 2;
275 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 2;
276 } else if (i & 0x02) {
277 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 1;
278 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 1;
279 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 1;
280 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 1;
281 } else if (i & 0x01) {
282 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 0;
283 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 0;
284 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 0;
285 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 0;
286 } else {
287 lc0msk_to_irqnr[i] = 0;
288 lc1msk_to_irqnr[i] = 0;
289 lc2msk_to_irqnr[i] = 0;
290 lc3msk_to_irqnr[i] = 0;
291 }
292 }
293
294 /* Mask out all interrupts. */
295 sgint->imask0 = 0;
296 sgint->imask1 = 0;
297 sgint->cmeimask0 = 0;
298 sgint->cmeimask1 = 0;
299
300 /* init CPU irqs */
301 mips_cpu_irq_init();
302
303 for (i = SGINT_LOCAL0; i < SGI_INTERRUPTS; i++) {
304 struct irq_chip *handler;
305
306 if (i < SGINT_LOCAL1)
307 handler = &ip22_local0_irq_type;
308 else if (i < SGINT_LOCAL2)
309 handler = &ip22_local1_irq_type;
310 else if (i < SGINT_LOCAL3)
311 handler = &ip22_local2_irq_type;
312 else
313 handler = &ip22_local3_irq_type;
314
315 irq_set_chip_and_handler(i, handler, handle_level_irq);
316 }
317
318 /* vector handler. this register the IRQ as non-sharable */
319 setup_irq(SGI_LOCAL_0_IRQ, &local0_cascade);
320 setup_irq(SGI_LOCAL_1_IRQ, &local1_cascade);
321 setup_irq(SGI_BUSERR_IRQ, &buserr);
322
323 /* cascade in cascade. i love Indy ;-) */
324 setup_irq(SGI_MAP_0_IRQ, &map0_cascade);
325 #ifdef USE_LIO3_IRQ
326 setup_irq(SGI_MAP_1_IRQ, &map1_cascade);
327 #endif
328
329 #ifdef CONFIG_EISA
330 if (ip22_is_fullhouse()) /* Only Indigo-2 has EISA stuff */
331 ip22_eisa_init();
332 #endif
333 }
Linux with added FPC-III support