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MIPS: Alchemy: devboards: wire up new PCMCIA driver.
[linux-2.6/libata-dev.git] / arch / mips / sgi-ip22 / ip22-int.c
blob383f11d7f4424f99f31b20e9093283e939f390be
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/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(unsigned int irq)
35 {
36 /* don't allow mappable interrupt to be enabled from setup_irq,
37 * we have our own way to do so */
38 if (irq != SGI_MAP_0_IRQ)
39 sgint->imask0 |= (1 << (irq - SGINT_LOCAL0));
40 }
41
42 static void disable_local0_irq(unsigned int irq)
43 {
44 sgint->imask0 &= ~(1 << (irq - SGINT_LOCAL0));
45 }
46
47 static struct irq_chip ip22_local0_irq_type = {
48 .name = "IP22 local 0",
49 .ack = disable_local0_irq,
50 .mask = disable_local0_irq,
51 .mask_ack = disable_local0_irq,
52 .unmask = enable_local0_irq,
53 };
54
55 static void enable_local1_irq(unsigned int irq)
56 {
57 /* don't allow mappable interrupt to be enabled from setup_irq,
58 * we have our own way to do so */
59 if (irq != SGI_MAP_1_IRQ)
60 sgint->imask1 |= (1 << (irq - SGINT_LOCAL1));
61 }
62
63 static void disable_local1_irq(unsigned int irq)
64 {
65 sgint->imask1 &= ~(1 << (irq - SGINT_LOCAL1));
66 }
67
68 static struct irq_chip ip22_local1_irq_type = {
69 .name = "IP22 local 1",
70 .ack = disable_local1_irq,
71 .mask = disable_local1_irq,
72 .mask_ack = disable_local1_irq,
73 .unmask = enable_local1_irq,
74 };
75
76 static void enable_local2_irq(unsigned int irq)
77 {
78 sgint->imask0 |= (1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0));
79 sgint->cmeimask0 |= (1 << (irq - SGINT_LOCAL2));
80 }
81
82 static void disable_local2_irq(unsigned int irq)
83 {
84 sgint->cmeimask0 &= ~(1 << (irq - SGINT_LOCAL2));
85 if (!sgint->cmeimask0)
86 sgint->imask0 &= ~(1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0));
87 }
88
89 static struct irq_chip ip22_local2_irq_type = {
90 .name = "IP22 local 2",
91 .ack = disable_local2_irq,
92 .mask = disable_local2_irq,
93 .mask_ack = disable_local2_irq,
94 .unmask = enable_local2_irq,
95 };
96
97 static void enable_local3_irq(unsigned int irq)
98 {
99 sgint->imask1 |= (1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1));
100 sgint->cmeimask1 |= (1 << (irq - SGINT_LOCAL3));
101 }
102
103 static void disable_local3_irq(unsigned int irq)
104 {
105 sgint->cmeimask1 &= ~(1 << (irq - SGINT_LOCAL3));
106 if (!sgint->cmeimask1)
107 sgint->imask1 &= ~(1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1));
108 }
109
110 static struct irq_chip ip22_local3_irq_type = {
111 .name = "IP22 local 3",
112 .ack = disable_local3_irq,
113 .mask = disable_local3_irq,
114 .mask_ack = disable_local3_irq,
115 .unmask = enable_local3_irq,
116 };
117
118 static void indy_local0_irqdispatch(void)
119 {
120 u8 mask = sgint->istat0 & sgint->imask0;
121 u8 mask2;
122 int irq;
123
124 if (mask & SGINT_ISTAT0_LIO2) {
125 mask2 = sgint->vmeistat & sgint->cmeimask0;
126 irq = lc2msk_to_irqnr[mask2];
127 } else
128 irq = lc0msk_to_irqnr[mask];
129
130 /* if irq == 0, then the interrupt has already been cleared */
131 if (irq)
132 do_IRQ(irq);
133 }
134
135 static void indy_local1_irqdispatch(void)
136 {
137 u8 mask = sgint->istat1 & sgint->imask1;
138 u8 mask2;
139 int irq;
140
141 if (mask & SGINT_ISTAT1_LIO3) {
142 mask2 = sgint->vmeistat & sgint->cmeimask1;
143 irq = lc3msk_to_irqnr[mask2];
144 } else
145 irq = lc1msk_to_irqnr[mask];
146
147 /* if irq == 0, then the interrupt has already been cleared */
148 if (irq)
149 do_IRQ(irq);
150 }
151
152 extern void ip22_be_interrupt(int irq);
153
154 static void __irq_entry indy_buserror_irq(void)
155 {
156 int irq = SGI_BUSERR_IRQ;
157
158 irq_enter();
159 kstat_incr_irqs_this_cpu(irq, irq_to_desc(irq));
160 ip22_be_interrupt(irq);
161 irq_exit();
162 }
163
164 static struct irqaction local0_cascade = {
165 .handler = no_action,
166 .flags = IRQF_DISABLED,
167 .name = "local0 cascade",
168 };
169
170 static struct irqaction local1_cascade = {
171 .handler = no_action,
172 .flags = IRQF_DISABLED,
173 .name = "local1 cascade",
174 };
175
176 static struct irqaction buserr = {
177 .handler = no_action,
178 .flags = IRQF_DISABLED,
179 .name = "Bus Error",
180 };
181
182 static struct irqaction map0_cascade = {
183 .handler = no_action,
184 .flags = IRQF_DISABLED,
185 .name = "mapable0 cascade",
186 };
187
188 #ifdef USE_LIO3_IRQ
189 static struct irqaction map1_cascade = {
190 .handler = no_action,
191 .flags = IRQF_DISABLED,
192 .name = "mapable1 cascade",
193 };
194 #define SGI_INTERRUPTS SGINT_END
195 #else
196 #define SGI_INTERRUPTS SGINT_LOCAL3
197 #endif
198
199 extern void indy_8254timer_irq(void);
200
201 /*
202 * IRQs on the INDY look basically (barring software IRQs which we don't use
203 * at all) like:
204 *
205 * MIPS IRQ Source
206 * -------- ------
207 * 0 Software (ignored)
208 * 1 Software (ignored)
209 * 2 Local IRQ level zero
210 * 3 Local IRQ level one
211 * 4 8254 Timer zero
212 * 5 8254 Timer one
213 * 6 Bus Error
214 * 7 R4k timer (what we use)
215 *
216 * We handle the IRQ according to _our_ priority which is:
217 *
218 * Highest ---- R4k Timer
219 * Local IRQ zero
220 * Local IRQ one
221 * Bus Error
222 * 8254 Timer zero
223 * Lowest ---- 8254 Timer one
224 *
225 * then we just return, if multiple IRQs are pending then we will just take
226 * another exception, big deal.
227 */
228
229 asmlinkage void plat_irq_dispatch(void)
230 {
231 unsigned int pending = read_c0_status() & read_c0_cause();
232
233 /*
234 * First we check for r4k counter/timer IRQ.
235 */
236 if (pending & CAUSEF_IP7)
237 do_IRQ(SGI_TIMER_IRQ);
238 else if (pending & CAUSEF_IP2)
239 indy_local0_irqdispatch();
240 else if (pending & CAUSEF_IP3)
241 indy_local1_irqdispatch();
242 else if (pending & CAUSEF_IP6)
243 indy_buserror_irq();
244 else if (pending & (CAUSEF_IP4 | CAUSEF_IP5))
245 indy_8254timer_irq();
246 }
247
248 void __init arch_init_irq(void)
249 {
250 int i;
251
252 /* Init local mask --> irq tables. */
253 for (i = 0; i < 256; i++) {
254 if (i & 0x80) {
255 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 7;
256 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 7;
257 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 7;
258 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 7;
259 } else if (i & 0x40) {
260 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 6;
261 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 6;
262 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 6;
263 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 6;
264 } else if (i & 0x20) {
265 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 5;
266 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 5;
267 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 5;
268 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 5;
269 } else if (i & 0x10) {
270 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 4;
271 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 4;
272 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 4;
273 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 4;
274 } else if (i & 0x08) {
275 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 3;
276 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 3;
277 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 3;
278 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 3;
279 } else if (i & 0x04) {
280 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 2;
281 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 2;
282 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 2;
283 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 2;
284 } else if (i & 0x02) {
285 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 1;
286 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 1;
287 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 1;
288 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 1;
289 } else if (i & 0x01) {
290 lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 0;
291 lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 0;
292 lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 0;
293 lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 0;
294 } else {
295 lc0msk_to_irqnr[i] = 0;
296 lc1msk_to_irqnr[i] = 0;
297 lc2msk_to_irqnr[i] = 0;
298 lc3msk_to_irqnr[i] = 0;
299 }
300 }
301
302 /* Mask out all interrupts. */
303 sgint->imask0 = 0;
304 sgint->imask1 = 0;
305 sgint->cmeimask0 = 0;
306 sgint->cmeimask1 = 0;
307
308 /* init CPU irqs */
309 mips_cpu_irq_init();
310
311 for (i = SGINT_LOCAL0; i < SGI_INTERRUPTS; i++) {
312 struct irq_chip *handler;
313
314 if (i < SGINT_LOCAL1)
315 handler = &ip22_local0_irq_type;
316 else if (i < SGINT_LOCAL2)
317 handler = &ip22_local1_irq_type;
318 else if (i < SGINT_LOCAL3)
319 handler = &ip22_local2_irq_type;
320 else
321 handler = &ip22_local3_irq_type;
322
323 set_irq_chip_and_handler(i, handler, handle_level_irq);
324 }
325
326 /* vector handler. this register the IRQ as non-sharable */
327 setup_irq(SGI_LOCAL_0_IRQ, &local0_cascade);
328 setup_irq(SGI_LOCAL_1_IRQ, &local1_cascade);
329 setup_irq(SGI_BUSERR_IRQ, &buserr);
330
331 /* cascade in cascade. i love Indy ;-) */
332 setup_irq(SGI_MAP_0_IRQ, &map0_cascade);
333 #ifdef USE_LIO3_IRQ
334 setup_irq(SGI_MAP_1_IRQ, &map1_cascade);
335 #endif
336
337 #ifdef CONFIG_EISA
338 if (ip22_is_fullhouse()) /* Only Indigo-2 has EISA stuff */
339 ip22_eisa_init();
340 #endif
341 }
Linux 2.6 libata-dev (mirror)