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-rw-r--r--arch/mips/mips-boards/generic/Makefile4
-rw-r--r--arch/mips/mips-boards/generic/mipsIRQ.S157
2 files changed, 2 insertions, 159 deletions
diff --git a/arch/mips/mips-boards/generic/Makefile b/arch/mips/mips-boards/generic/Makefile
index b21bc6887fa8..be47c1c2bc80 100644
--- a/arch/mips/mips-boards/generic/Makefile
+++ b/arch/mips/mips-boards/generic/Makefile
@@ -18,8 +18,8 @@
18# Makefile for the MIPS boards generic routines under Linux. 18# Makefile for the MIPS boards generic routines under Linux.
19# 19#
20 20
21obj-y := mipsIRQ.o reset.o display.o init.o memory.o \ 21obj-y := reset.o display.o init.o memory.o printf.o \
22 printf.o cmdline.o time.o 22 cmdline.o time.o
23obj-$(CONFIG_PCI) += pci.o 23obj-$(CONFIG_PCI) += pci.o
24obj-$(CONFIG_KGDB) += gdb_hook.o 24obj-$(CONFIG_KGDB) += gdb_hook.o
25 25
diff --git a/arch/mips/mips-boards/generic/mipsIRQ.S b/arch/mips/mips-boards/generic/mipsIRQ.S
deleted file mode 100644
index 973e10aaacd5..000000000000
--- a/arch/mips/mips-boards/generic/mipsIRQ.S
+++ /dev/null
@@ -1,157 +0,0 @@
1/*
2 * Carsten Langgaard, carstenl@mips.com
3 * Copyright (C) 1999, 2000 MIPS Technologies, Inc. All rights reserved.
4 *
5 * ########################################################################
6 *
7 * This program is free software; you can distribute it and/or modify it
8 * under the terms of the GNU General Public License (Version 2) as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * for more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
19 *
20 * ########################################################################
21 *
22 * Interrupt exception dispatch code.
23 *
24 */
25#include <linux/config.h>
26
27#include <asm/asm.h>
28#include <asm/mipsregs.h>
29#include <asm/regdef.h>
30#include <asm/stackframe.h>
31
32#ifdef CONFIG_MIPS_ATLAS
33#include <asm/mips-boards/atlasint.h>
34#define CASCADE_IRQ MIPSCPU_INT_ATLAS
35#define CASCADE_DISPATCH atlas_hw0_irqdispatch
36#endif
37#ifdef CONFIG_MIPS_MALTA
38#include <asm/mips-boards/maltaint.h>
39#define CASCADE_IRQ MIPSCPU_INT_I8259A
40#define CASCADE_DISPATCH malta_hw0_irqdispatch
41#endif
42#ifdef CONFIG_MIPS_SEAD
43#include <asm/mips-boards/seadint.h>
44#endif
45
46/* A lot of complication here is taken away because:
47 *
48 * 1) We handle one interrupt and return, sitting in a loop and moving across
49 * all the pending IRQ bits in the cause register is _NOT_ the answer, the
50 * common case is one pending IRQ so optimize in that direction.
51 *
52 * 2) We need not check against bits in the status register IRQ mask, that
53 * would make this routine slow as hell.
54 *
55 * 3) Linux only thinks in terms of all IRQs on or all IRQs off, nothing in
56 * between like BSD spl() brain-damage.
57 *
58 * Furthermore, the IRQs on the MIPS board look basically (barring software
59 * IRQs which we don't use at all and all external interrupt sources are
60 * combined together on hardware interrupt 0 (MIPS IRQ 2)) like:
61 *
62 * MIPS IRQ Source
63 * -------- ------
64 * 0 Software (ignored)
65 * 1 Software (ignored)
66 * 2 Combined hardware interrupt (hw0)
67 * 3 Hardware (ignored)
68 * 4 Hardware (ignored)
69 * 5 Hardware (ignored)
70 * 6 Hardware (ignored)
71 * 7 R4k timer (what we use)
72 *
73 * Note: On the SEAD board thing are a little bit different.
74 * Here IRQ 2 (hw0) is wired to the UART0 and IRQ 3 (hw1) is wired
75 * wired to UART1.
76 *
77 * We handle the IRQ according to _our_ priority which is:
78 *
79 * Highest ---- R4k Timer
80 * Lowest ---- Combined hardware interrupt
81 *
82 * then we just return, if multiple IRQs are pending then we will just take
83 * another exception, big deal.
84 */
85
86 .text
87 .set noreorder
88 .set noat
89 .align 5
90 NESTED(mipsIRQ, PT_SIZE, sp)
91 SAVE_ALL
92 CLI
93 .set at
94
95 mfc0 s0, CP0_CAUSE # get irq bits
96 mfc0 s1, CP0_STATUS # get irq mask
97 andi s0, ST0_IM # CAUSE.CE may be non-zero!
98 and s0, s1
99
100#if defined(CONFIG_CPU_MIPS32) || defined(CONFIG_CPU_MIPS64)
101 .set mips32
102 clz a0, s0
103 .set mips0
104 negu a0
105 addu a0, 31-CAUSEB_IP
106 bltz a0, spurious
107#else
108 beqz s0, spurious
109 li a0, 7
110
111 and t0, s0, 0xf000
112 sltiu t0, t0, 1
113 sll t0, 2
114 subu a0, t0
115 sll s0, t0
116
117 and t0, s0, 0xc000
118 sltiu t0, t0, 1
119 sll t0, 1
120 subu a0, t0
121 sll s0, t0
122
123 and t0, s0, 0x8000
124 sltiu t0, t0, 1
125 # sll t0, 0
126 subu a0, t0
127 # sll s0, t0
128#endif
129
130#ifdef CASCADE_IRQ
131 li a1, CASCADE_IRQ
132 bne a0, a1, 1f
133 addu a0, MIPSCPU_INT_BASE
134
135 jal CASCADE_DISPATCH
136 move a0, sp
137
138 j ret_from_irq
139 nop
1401:
141#else
142 addu a0, MIPSCPU_INT_BASE
143#endif
144
145 jal do_IRQ
146 move a1, sp
147
148 j ret_from_irq
149 nop
150
151
152spurious:
153 jal spurious_interrupt
154 nop
155 j ret_from_irq
156 nop
157 END(mipsIRQ)
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-16 00:06:58 -0500