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-rw-r--r--arch/mips/sgi-ip22/Makefile2
-rw-r--r--arch/mips/sgi-ip22/ip22-int.c59
-rw-r--r--arch/mips/sgi-ip22/ip22-irq.S118
3 files changed, 54 insertions, 125 deletions
diff --git a/arch/mips/sgi-ip22/Makefile b/arch/mips/sgi-ip22/Makefile
index eb0820fe50bd..6aa4c0cd169c 100644
--- a/arch/mips/sgi-ip22/Makefile
+++ b/arch/mips/sgi-ip22/Makefile
@@ -3,7 +3,7 @@
3# under Linux. 3# under Linux.
4# 4#
5 5
6obj-y += ip22-mc.o ip22-hpc.o ip22-int.o ip22-irq.o ip22-berr.o \ 6obj-y += ip22-mc.o ip22-hpc.o ip22-int.o ip22-berr.o \
7 ip22-time.o ip22-nvram.o ip22-reset.o ip22-setup.o 7 ip22-time.o ip22-nvram.o ip22-reset.o ip22-setup.o
8 8
9obj-$(CONFIG_EISA) += ip22-eisa.o 9obj-$(CONFIG_EISA) += ip22-eisa.o
diff --git a/arch/mips/sgi-ip22/ip22-int.c b/arch/mips/sgi-ip22/ip22-int.c
index d16fb43b1a93..fc6a7e2b189c 100644
--- a/arch/mips/sgi-ip22/ip22-int.c
+++ b/arch/mips/sgi-ip22/ip22-int.c
@@ -37,7 +37,6 @@ static char lc1msk_to_irqnr[256];
37static char lc2msk_to_irqnr[256]; 37static char lc2msk_to_irqnr[256];
38static char lc3msk_to_irqnr[256]; 38static char lc3msk_to_irqnr[256];
39 39
40extern asmlinkage void indyIRQ(void);
41extern int ip22_eisa_init(void); 40extern int ip22_eisa_init(void);
42 41
43static void enable_local0_irq(unsigned int irq) 42static void enable_local0_irq(unsigned int irq)
@@ -224,7 +223,7 @@ static struct hw_interrupt_type ip22_local3_irq_type = {
224 .end = end_local3_irq, 223 .end = end_local3_irq,
225}; 224};
226 225
227void indy_local0_irqdispatch(struct pt_regs *regs) 226static void indy_local0_irqdispatch(struct pt_regs *regs)
228{ 227{
229 u8 mask = sgint->istat0 & sgint->imask0; 228 u8 mask = sgint->istat0 & sgint->imask0;
230 u8 mask2; 229 u8 mask2;
@@ -242,7 +241,7 @@ void indy_local0_irqdispatch(struct pt_regs *regs)
242 return; 241 return;
243} 242}
244 243
245void indy_local1_irqdispatch(struct pt_regs *regs) 244static void indy_local1_irqdispatch(struct pt_regs *regs)
246{ 245{
247 u8 mask = sgint->istat1 & sgint->imask1; 246 u8 mask = sgint->istat1 & sgint->imask1;
248 u8 mask2; 247 u8 mask2;
@@ -262,7 +261,7 @@ void indy_local1_irqdispatch(struct pt_regs *regs)
262 261
263extern void ip22_be_interrupt(int irq, struct pt_regs *regs); 262extern void ip22_be_interrupt(int irq, struct pt_regs *regs);
264 263
265void indy_buserror_irq(struct pt_regs *regs) 264static void indy_buserror_irq(struct pt_regs *regs)
266{ 265{
267 int irq = SGI_BUSERR_IRQ; 266 int irq = SGI_BUSERR_IRQ;
268 267
@@ -307,6 +306,56 @@ static struct irqaction map1_cascade = {
307#define SGI_INTERRUPTS SGINT_LOCAL3 306#define SGI_INTERRUPTS SGINT_LOCAL3
308#endif 307#endif
309 308
309extern void indy_r4k_timer_interrupt(struct pt_regs *regs);
310extern void indy_8254timer_irq(struct pt_regs *regs);
311
312/*
313 * IRQs on the INDY look basically (barring software IRQs which we don't use
314 * at all) like:
315 *
316 * MIPS IRQ Source
317 * -------- ------
318 * 0 Software (ignored)
319 * 1 Software (ignored)
320 * 2 Local IRQ level zero
321 * 3 Local IRQ level one
322 * 4 8254 Timer zero
323 * 5 8254 Timer one
324 * 6 Bus Error
325 * 7 R4k timer (what we use)
326 *
327 * We handle the IRQ according to _our_ priority which is:
328 *
329 * Highest ---- R4k Timer
330 * Local IRQ zero
331 * Local IRQ one
332 * Bus Error
333 * 8254 Timer zero
334 * Lowest ---- 8254 Timer one
335 *
336 * then we just return, if multiple IRQs are pending then we will just take
337 * another exception, big deal.
338 */
339
340asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
341{
342 unsigned int pending = read_c0_cause();
343
344 /*
345 * First we check for r4k counter/timer IRQ.
346 */
347 if (pending & CAUSEF_IP7)
348 indy_r4k_timer_interrupt(regs);
349 else if (pending & CAUSEF_IP2)
350 indy_local0_irqdispatch(regs);
351 else if (pending & CAUSEF_IP3)
352 indy_local1_irqdispatch(regs);
353 else if (pending & CAUSEF_IP6)
354 indy_buserror_irq(regs);
355 else if (pending & (CAUSEF_IP4 | CAUSEF_IP5))
356 indy_8254timer_irq(regs);
357}
358
310extern void mips_cpu_irq_init(unsigned int irq_base); 359extern void mips_cpu_irq_init(unsigned int irq_base);
311 360
312void __init arch_init_irq(void) 361void __init arch_init_irq(void)
@@ -369,8 +418,6 @@ void __init arch_init_irq(void)
369 sgint->cmeimask0 = 0; 418 sgint->cmeimask0 = 0;
370 sgint->cmeimask1 = 0; 419 sgint->cmeimask1 = 0;
371 420
372 set_except_vector(0, indyIRQ);
373
374 /* init CPU irqs */ 421 /* init CPU irqs */
375 mips_cpu_irq_init(SGINT_CPU); 422 mips_cpu_irq_init(SGINT_CPU);
376 423
diff --git a/arch/mips/sgi-ip22/ip22-irq.S b/arch/mips/sgi-ip22/ip22-irq.S
deleted file mode 100644
index 6ccbd9e1d967..000000000000
--- a/arch/mips/sgi-ip22/ip22-irq.S
+++ /dev/null
@@ -1,118 +0,0 @@
1/*
2 * ip22-irq.S: Interrupt exception dispatch code for FullHouse and
3 * Guiness.
4 *
5 * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
6 */
7
8#include <asm/asm.h>
9#include <asm/mipsregs.h>
10#include <asm/regdef.h>
11#include <asm/stackframe.h>
12
13/* A lot of complication here is taken away because:
14 *
15 * 1) We handle one interrupt and return, sitting in a loop and moving across
16 * all the pending IRQ bits in the cause register is _NOT_ the answer, the
17 * common case is one pending IRQ so optimize in that direction.
18 *
19 * 2) We need not check against bits in the status register IRQ mask, that
20 * would make this routine slow as hell.
21 *
22 * 3) Linux only thinks in terms of all IRQs on or all IRQs off, nothing in
23 * between like BSD spl() brain-damage.
24 *
25 * Furthermore, the IRQs on the INDY look basically (barring software IRQs
26 * which we don't use at all) like:
27 *
28 * MIPS IRQ Source
29 * -------- ------
30 * 0 Software (ignored)
31 * 1 Software (ignored)
32 * 2 Local IRQ level zero
33 * 3 Local IRQ level one
34 * 4 8254 Timer zero
35 * 5 8254 Timer one
36 * 6 Bus Error
37 * 7 R4k timer (what we use)
38 *
39 * We handle the IRQ according to _our_ priority which is:
40 *
41 * Highest ---- R4k Timer
42 * Local IRQ zero
43 * Local IRQ one
44 * Bus Error
45 * 8254 Timer zero
46 * Lowest ---- 8254 Timer one
47 *
48 * then we just return, if multiple IRQs are pending then we will just take
49 * another exception, big deal.
50 */
51
52 .text
53 .set noreorder
54 .set noat
55 .align 5
56 NESTED(indyIRQ, PT_SIZE, sp)
57 SAVE_ALL
58 CLI
59 .set at
60 mfc0 s0, CP0_CAUSE # get irq mask
61
62 /* First we check for r4k counter/timer IRQ. */
63 andi a0, s0, CAUSEF_IP7
64 beq a0, zero, 1f
65 andi a0, s0, CAUSEF_IP2 # delay slot, check local level zero
66
67 /* Wheee, a timer interrupt. */
68 jal indy_r4k_timer_interrupt
69 move a0, sp # delay slot
70 j ret_from_irq
71 nop # delay slot
72
731:
74 beq a0, zero, 1f
75 andi a0, s0, CAUSEF_IP3 # delay slot, check local level one
76
77 /* Wheee, local level zero interrupt. */
78 jal indy_local0_irqdispatch
79 move a0, sp # delay slot
80
81 j ret_from_irq
82 nop # delay slot
83
841:
85 beq a0, zero, 1f
86 andi a0, s0, CAUSEF_IP6 # delay slot, check bus error
87
88 /* Wheee, local level one interrupt. */
89 jal indy_local1_irqdispatch
90 move a0, sp # delay slot
91 j ret_from_irq
92 nop # delay slot
93
941:
95 beq a0, zero, 1f
96 andi a0, s0, (CAUSEF_IP4 | CAUSEF_IP5) # delay slot
97
98 /* Wheee, an asynchronous bus error... */
99 jal indy_buserror_irq
100 move a0, sp # delay slot
101 j ret_from_irq
102 nop # delay slot
103
1041:
105 /* Here by mistake? It is possible, that by the time we take
106 * the exception the IRQ pin goes low, so just leave if this
107 * is the case.
108 */
109 beq a0, zero, 1f
110 nop # delay slot
111
112 /* Must be one of the 8254 timers... */
113 jal indy_8254timer_irq
114 move a0, sp # delay slot
1151:
116 j ret_from_irq
117 nop # delay slot
118 END(indyIRQ)