1 // SPDX-License-Identifier: GPL-2.0
3 * ip22-int.c: Routines for generic manipulation of the INT[23] ASIC
4 * found on INDY and Indigo2 workstations.
6 * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
7 * Copyright (C) 1997, 1998 Ralf Baechle (ralf@gnu.org)
8 * Copyright (C) 1999 Andrew R. Baker (andrewb@uab.edu)
10 * - Interrupt handling fixes
11 * Copyright (C) 2001, 2003 Ladislav Michl (ladis@linux-mips.org)
13 #include <linux/types.h>
14 #include <linux/init.h>
15 #include <linux/kernel_stat.h>
16 #include <linux/interrupt.h>
17 #include <linux/ftrace.h>
19 #include <asm/irq_cpu.h>
20 #include <asm/sgi/hpc3.h>
21 #include <asm/sgi/ip22.h>
23 /* So far nothing hangs here */
26 struct sgint_regs
*sgint
;
28 static char lc0msk_to_irqnr
[256];
29 static char lc1msk_to_irqnr
[256];
30 static char lc2msk_to_irqnr
[256];
31 static char lc3msk_to_irqnr
[256];
33 extern int ip22_eisa_init(void);
35 static void enable_local0_irq(struct irq_data
*d
)
37 /* don't allow mappable interrupt to be enabled from setup_irq,
38 * we have our own way to do so */
39 if (d
->irq
!= SGI_MAP_0_IRQ
)
40 sgint
->imask0
|= (1 << (d
->irq
- SGINT_LOCAL0
));
43 static void disable_local0_irq(struct irq_data
*d
)
45 sgint
->imask0
&= ~(1 << (d
->irq
- SGINT_LOCAL0
));
48 static struct irq_chip ip22_local0_irq_type
= {
49 .name
= "IP22 local 0",
50 .irq_mask
= disable_local0_irq
,
51 .irq_unmask
= enable_local0_irq
,
54 static void enable_local1_irq(struct irq_data
*d
)
56 /* don't allow mappable interrupt to be enabled from setup_irq,
57 * we have our own way to do so */
58 if (d
->irq
!= SGI_MAP_1_IRQ
)
59 sgint
->imask1
|= (1 << (d
->irq
- SGINT_LOCAL1
));
62 static void disable_local1_irq(struct irq_data
*d
)
64 sgint
->imask1
&= ~(1 << (d
->irq
- SGINT_LOCAL1
));
67 static struct irq_chip ip22_local1_irq_type
= {
68 .name
= "IP22 local 1",
69 .irq_mask
= disable_local1_irq
,
70 .irq_unmask
= enable_local1_irq
,
73 static void enable_local2_irq(struct irq_data
*d
)
75 sgint
->imask0
|= (1 << (SGI_MAP_0_IRQ
- SGINT_LOCAL0
));
76 sgint
->cmeimask0
|= (1 << (d
->irq
- SGINT_LOCAL2
));
79 static void disable_local2_irq(struct irq_data
*d
)
81 sgint
->cmeimask0
&= ~(1 << (d
->irq
- SGINT_LOCAL2
));
82 if (!sgint
->cmeimask0
)
83 sgint
->imask0
&= ~(1 << (SGI_MAP_0_IRQ
- SGINT_LOCAL0
));
86 static struct irq_chip ip22_local2_irq_type
= {
87 .name
= "IP22 local 2",
88 .irq_mask
= disable_local2_irq
,
89 .irq_unmask
= enable_local2_irq
,
92 static void enable_local3_irq(struct irq_data
*d
)
94 sgint
->imask1
|= (1 << (SGI_MAP_1_IRQ
- SGINT_LOCAL1
));
95 sgint
->cmeimask1
|= (1 << (d
->irq
- SGINT_LOCAL3
));
98 static void disable_local3_irq(struct irq_data
*d
)
100 sgint
->cmeimask1
&= ~(1 << (d
->irq
- SGINT_LOCAL3
));
101 if (!sgint
->cmeimask1
)
102 sgint
->imask1
&= ~(1 << (SGI_MAP_1_IRQ
- SGINT_LOCAL1
));
105 static struct irq_chip ip22_local3_irq_type
= {
106 .name
= "IP22 local 3",
107 .irq_mask
= disable_local3_irq
,
108 .irq_unmask
= enable_local3_irq
,
111 static void indy_local0_irqdispatch(void)
113 u8 mask
= sgint
->istat0
& sgint
->imask0
;
117 if (mask
& SGINT_ISTAT0_LIO2
) {
118 mask2
= sgint
->vmeistat
& sgint
->cmeimask0
;
119 irq
= lc2msk_to_irqnr
[mask2
];
121 irq
= lc0msk_to_irqnr
[mask
];
124 * workaround for INT2 bug; if irq == 0, INT2 has seen a fifo full
125 * irq, but failed to latch it into status register
130 do_IRQ(SGINT_LOCAL0
+ 0);
133 static void indy_local1_irqdispatch(void)
135 u8 mask
= sgint
->istat1
& sgint
->imask1
;
139 if (mask
& SGINT_ISTAT1_LIO3
) {
140 mask2
= sgint
->vmeistat
& sgint
->cmeimask1
;
141 irq
= lc3msk_to_irqnr
[mask2
];
143 irq
= lc1msk_to_irqnr
[mask
];
145 /* if irq == 0, then the interrupt has already been cleared */
150 extern void ip22_be_interrupt(int irq
);
152 static void __irq_entry
indy_buserror_irq(void)
154 int irq
= SGI_BUSERR_IRQ
;
157 kstat_incr_irq_this_cpu(irq
);
158 ip22_be_interrupt(irq
);
163 #define SGI_INTERRUPTS SGINT_END
165 #define SGI_INTERRUPTS SGINT_LOCAL3
168 extern void indy_8254timer_irq(void);
171 * IRQs on the INDY look basically (barring software IRQs which we don't use
176 * 0 Software (ignored)
177 * 1 Software (ignored)
178 * 2 Local IRQ level zero
179 * 3 Local IRQ level one
183 * 7 R4k timer (what we use)
185 * We handle the IRQ according to _our_ priority which is:
187 * Highest ---- R4k Timer
192 * Lowest ---- 8254 Timer one
194 * then we just return, if multiple IRQs are pending then we will just take
195 * another exception, big deal.
198 asmlinkage
void plat_irq_dispatch(void)
200 unsigned int pending
= read_c0_status() & read_c0_cause();
203 * First we check for r4k counter/timer IRQ.
205 if (pending
& CAUSEF_IP7
)
206 do_IRQ(SGI_TIMER_IRQ
);
207 else if (pending
& CAUSEF_IP2
)
208 indy_local0_irqdispatch();
209 else if (pending
& CAUSEF_IP3
)
210 indy_local1_irqdispatch();
211 else if (pending
& CAUSEF_IP6
)
213 else if (pending
& (CAUSEF_IP4
| CAUSEF_IP5
))
214 indy_8254timer_irq();
217 void __init
arch_init_irq(void)
221 /* Init local mask --> irq tables. */
222 for (i
= 0; i
< 256; i
++) {
224 lc0msk_to_irqnr
[i
] = SGINT_LOCAL0
+ 7;
225 lc1msk_to_irqnr
[i
] = SGINT_LOCAL1
+ 7;
226 lc2msk_to_irqnr
[i
] = SGINT_LOCAL2
+ 7;
227 lc3msk_to_irqnr
[i
] = SGINT_LOCAL3
+ 7;
228 } else if (i
& 0x40) {
229 lc0msk_to_irqnr
[i
] = SGINT_LOCAL0
+ 6;
230 lc1msk_to_irqnr
[i
] = SGINT_LOCAL1
+ 6;
231 lc2msk_to_irqnr
[i
] = SGINT_LOCAL2
+ 6;
232 lc3msk_to_irqnr
[i
] = SGINT_LOCAL3
+ 6;
233 } else if (i
& 0x20) {
234 lc0msk_to_irqnr
[i
] = SGINT_LOCAL0
+ 5;
235 lc1msk_to_irqnr
[i
] = SGINT_LOCAL1
+ 5;
236 lc2msk_to_irqnr
[i
] = SGINT_LOCAL2
+ 5;
237 lc3msk_to_irqnr
[i
] = SGINT_LOCAL3
+ 5;
238 } else if (i
& 0x10) {
239 lc0msk_to_irqnr
[i
] = SGINT_LOCAL0
+ 4;
240 lc1msk_to_irqnr
[i
] = SGINT_LOCAL1
+ 4;
241 lc2msk_to_irqnr
[i
] = SGINT_LOCAL2
+ 4;
242 lc3msk_to_irqnr
[i
] = SGINT_LOCAL3
+ 4;
243 } else if (i
& 0x08) {
244 lc0msk_to_irqnr
[i
] = SGINT_LOCAL0
+ 3;
245 lc1msk_to_irqnr
[i
] = SGINT_LOCAL1
+ 3;
246 lc2msk_to_irqnr
[i
] = SGINT_LOCAL2
+ 3;
247 lc3msk_to_irqnr
[i
] = SGINT_LOCAL3
+ 3;
248 } else if (i
& 0x04) {
249 lc0msk_to_irqnr
[i
] = SGINT_LOCAL0
+ 2;
250 lc1msk_to_irqnr
[i
] = SGINT_LOCAL1
+ 2;
251 lc2msk_to_irqnr
[i
] = SGINT_LOCAL2
+ 2;
252 lc3msk_to_irqnr
[i
] = SGINT_LOCAL3
+ 2;
253 } else if (i
& 0x02) {
254 lc0msk_to_irqnr
[i
] = SGINT_LOCAL0
+ 1;
255 lc1msk_to_irqnr
[i
] = SGINT_LOCAL1
+ 1;
256 lc2msk_to_irqnr
[i
] = SGINT_LOCAL2
+ 1;
257 lc3msk_to_irqnr
[i
] = SGINT_LOCAL3
+ 1;
258 } else if (i
& 0x01) {
259 lc0msk_to_irqnr
[i
] = SGINT_LOCAL0
+ 0;
260 lc1msk_to_irqnr
[i
] = SGINT_LOCAL1
+ 0;
261 lc2msk_to_irqnr
[i
] = SGINT_LOCAL2
+ 0;
262 lc3msk_to_irqnr
[i
] = SGINT_LOCAL3
+ 0;
264 lc0msk_to_irqnr
[i
] = 0;
265 lc1msk_to_irqnr
[i
] = 0;
266 lc2msk_to_irqnr
[i
] = 0;
267 lc3msk_to_irqnr
[i
] = 0;
271 /* Mask out all interrupts. */
274 sgint
->cmeimask0
= 0;
275 sgint
->cmeimask1
= 0;
280 for (i
= SGINT_LOCAL0
; i
< SGI_INTERRUPTS
; i
++) {
281 struct irq_chip
*handler
;
283 if (i
< SGINT_LOCAL1
)
284 handler
= &ip22_local0_irq_type
;
285 else if (i
< SGINT_LOCAL2
)
286 handler
= &ip22_local1_irq_type
;
287 else if (i
< SGINT_LOCAL3
)
288 handler
= &ip22_local2_irq_type
;
290 handler
= &ip22_local3_irq_type
;
292 irq_set_chip_and_handler(i
, handler
, handle_level_irq
);
295 /* vector handler. this register the IRQ as non-sharable */
296 if (request_irq(SGI_LOCAL_0_IRQ
, no_action
, IRQF_NO_THREAD
,
297 "local0 cascade", NULL
))
298 pr_err("Failed to register local0 cascade interrupt\n");
299 if (request_irq(SGI_LOCAL_1_IRQ
, no_action
, IRQF_NO_THREAD
,
300 "local1 cascade", NULL
))
301 pr_err("Failed to register local1 cascade interrupt\n");
302 if (request_irq(SGI_BUSERR_IRQ
, no_action
, IRQF_NO_THREAD
,
304 pr_err("Failed to register Bus Error interrupt\n");
306 /* cascade in cascade. i love Indy ;-) */
307 if (request_irq(SGI_MAP_0_IRQ
, no_action
, IRQF_NO_THREAD
,
308 "mapable0 cascade", NULL
))
309 pr_err("Failed to register mapable0 cascade interrupt\n");
311 if (request_irq(SGI_MAP_1_IRQ
, no_action
, IRQF_NO_THREAD
,
312 "mapable1 cascade", NULL
))
313 pr_err("Failed to register mapable1 cascade interrupt\n");
317 if (ip22_is_fullhouse()) /* Only Indigo-2 has EISA stuff */