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authorRalf Baechle <ralf@linux-mips.org>2006-04-03 08:17:41 -0400
committerRalf Baechle <ralf@linux-mips.org>2006-04-18 22:14:21 -0400
commitd35d473c25d43d7db3e5e18b66d558d2a631cca8 (patch)
tree2351622ad74bb5f09ee2faf0daf6581e7b9e47c5 /arch/mips
parentfde3505c695e0de8ae7504b58d373db2d0ba498a (diff)
[MIPS] Fix the crime against humanity that mipsIRQ.S is.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips')
-rw-r--r--arch/mips/mips-boards/atlas/Makefile2
-rw-r--r--arch/mips/mips-boards/atlas/atlas-irq.S (renamed from arch/mips/mips-boards/generic/mipsIRQ.S)47
-rw-r--r--arch/mips/mips-boards/generic/Makefile4
-rw-r--r--arch/mips/mips-boards/malta/Makefile2
-rw-r--r--arch/mips/mips-boards/malta/malta-irq.S122
-rw-r--r--arch/mips/mips-boards/sead/Makefile2
-rw-r--r--arch/mips/mips-boards/sead/sead-irq.S111
7 files changed, 243 insertions, 47 deletions
diff --git a/arch/mips/mips-boards/atlas/Makefile b/arch/mips/mips-boards/atlas/Makefile
index d8dab75906bf..50fec2a5aee6 100644
--- a/arch/mips/mips-boards/atlas/Makefile
+++ b/arch/mips/mips-boards/atlas/Makefile
@@ -16,5 +16,5 @@
16# 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. 16# 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
17# 17#
18 18
19obj-y := atlas_int.o atlas_setup.o 19obj-y := atlas_int.o atlas-irq.o atlas_setup.o
20obj-$(CONFIG_KGDB) += atlas_gdb.o 20obj-$(CONFIG_KGDB) += atlas_gdb.o
diff --git a/arch/mips/mips-boards/generic/mipsIRQ.S b/arch/mips/mips-boards/atlas/atlas-irq.S
index 973e10aaacd5..31bc99a52383 100644
--- a/arch/mips/mips-boards/generic/mipsIRQ.S
+++ b/arch/mips/mips-boards/atlas/atlas-irq.S
@@ -2,8 +2,6 @@
2 * Carsten Langgaard, carstenl@mips.com 2 * Carsten Langgaard, carstenl@mips.com
3 * Copyright (C) 1999, 2000 MIPS Technologies, Inc. All rights reserved. 3 * Copyright (C) 1999, 2000 MIPS Technologies, Inc. All rights reserved.
4 * 4 *
5 * ########################################################################
6 *
7 * This program is free software; you can distribute it and/or modify it 5 * 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 6 * under the terms of the GNU General Public License (Version 2) as
9 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
@@ -17,10 +15,7 @@
17 * with this program; if not, write to the Free Software Foundation, Inc., 15 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. 16 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
19 * 17 *
20 * ########################################################################
21 *
22 * Interrupt exception dispatch code. 18 * Interrupt exception dispatch code.
23 *
24 */ 19 */
25#include <linux/config.h> 20#include <linux/config.h>
26 21
@@ -28,33 +23,9 @@
28#include <asm/mipsregs.h> 23#include <asm/mipsregs.h>
29#include <asm/regdef.h> 24#include <asm/regdef.h>
30#include <asm/stackframe.h> 25#include <asm/stackframe.h>
31
32#ifdef CONFIG_MIPS_ATLAS
33#include <asm/mips-boards/atlasint.h> 26#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 27
46/* A lot of complication here is taken away because: 28/*
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 29 * 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 30 * 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: 31 * combined together on hardware interrupt 0 (MIPS IRQ 2)) like:
@@ -127,31 +98,23 @@
127 # sll s0, t0 98 # sll s0, t0
128#endif 99#endif
129 100
130#ifdef CASCADE_IRQ 101 li a1, MIPSCPU_INT_ATLAS
131 li a1, CASCADE_IRQ
132 bne a0, a1, 1f 102 bne a0, a1, 1f
133 addu a0, MIPSCPU_INT_BASE 103 addu a0, MIPSCPU_INT_BASE
134 104
135 jal CASCADE_DISPATCH 105 jal atlas_hw0_irqdispatch
136 move a0, sp 106 move a0, sp
137 107
138 j ret_from_irq 108 j ret_from_irq
139 nop 109 nop
1401:
141#else
142 addu a0, MIPSCPU_INT_BASE
143#endif
144 110
145 jal do_IRQ 1111: jal do_IRQ
146 move a1, sp 112 move a1, sp
147 113
148 j ret_from_irq 114 j ret_from_irq
149 nop 115 nop
150 116
151
152spurious: 117spurious:
153 jal spurious_interrupt 118 j spurious_interrupt
154 nop
155 j ret_from_irq
156 nop 119 nop
157 END(mipsIRQ) 120 END(mipsIRQ)
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/malta/Makefile b/arch/mips/mips-boards/malta/Makefile
index fd4c143c0e2f..3ae8fe6c0070 100644
--- a/arch/mips/mips-boards/malta/Makefile
+++ b/arch/mips/mips-boards/malta/Makefile
@@ -19,4 +19,4 @@
19# under Linux. 19# under Linux.
20# 20#
21 21
22obj-y := malta_int.o malta_setup.o 22obj-y := malta_int.o malta-irq.o malta_setup.o
diff --git a/arch/mips/mips-boards/malta/malta-irq.S b/arch/mips/mips-boards/malta/malta-irq.S
new file mode 100644
index 000000000000..6217aff3be03
--- /dev/null
+++ b/arch/mips/mips-boards/malta/malta-irq.S
@@ -0,0 +1,122 @@
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#include <asm/mips-boards/maltaint.h>
32
33/*
34 * IRQs on the Malta board look basically (barring software IRQs which we
35 * don't use at all and all external interrupt sources are combined together
36 * on hardware interrupt 0 (MIPS IRQ 2)) like:
37 *
38 * MIPS IRQ Source
39 * -------- ------
40 * 0 Software (ignored)
41 * 1 Software (ignored)
42 * 2 Combined hardware interrupt (hw0)
43 * 3 Hardware (ignored)
44 * 4 Hardware (ignored)
45 * 5 Hardware (ignored)
46 * 6 Hardware (ignored)
47 * 7 R4k timer (what we use)
48 *
49 * We handle the IRQ according to _our_ priority which is:
50 *
51 * Highest ---- R4k Timer
52 * Lowest ---- Combined hardware interrupt
53 *
54 * then we just return, if multiple IRQs are pending then we will just take
55 * another exception, big deal.
56 */
57
58 .text
59 .set noreorder
60 .set noat
61 .align 5
62 NESTED(mipsIRQ, PT_SIZE, sp)
63 SAVE_ALL
64 CLI
65 .set at
66
67 mfc0 s0, CP0_CAUSE # get irq bits
68 mfc0 s1, CP0_STATUS # get irq mask
69 andi s0, ST0_IM # CAUSE.CE may be non-zero!
70 and s0, s1
71
72#if defined(CONFIG_CPU_MIPS32) || defined(CONFIG_CPU_MIPS64)
73 .set mips32
74 clz a0, s0
75 .set mips0
76 negu a0
77 addu a0, 31-CAUSEB_IP
78 bltz a0, spurious
79#else
80 beqz s0, spurious
81 li a0, 7
82
83 and t0, s0, 0xf000
84 sltiu t0, t0, 1
85 sll t0, 2
86 subu a0, t0
87 sll s0, t0
88
89 and t0, s0, 0xc000
90 sltiu t0, t0, 1
91 sll t0, 1
92 subu a0, t0
93 sll s0, t0
94
95 and t0, s0, 0x8000
96 sltiu t0, t0, 1
97 # sll t0, 0
98 subu a0, t0
99 # sll s0, t0
100#endif
101
102 li a1, MIPSCPU_INT_I8259A
103 bne a0, a1, 1f
104 addu a0, MIPSCPU_INT_BASE
105
106 jal malta_hw0_irqdispatch
107 move a0, sp
108
109 j ret_from_irq
110 nop
1111:
112
113 jal do_IRQ
114 move a1, sp
115
116 j ret_from_irq
117 nop
118
119spurious:
120 j spurious_interrupt
121 nop
122 END(mipsIRQ)
diff --git a/arch/mips/mips-boards/sead/Makefile b/arch/mips/mips-boards/sead/Makefile
index 224bb848f16b..01780b605346 100644
--- a/arch/mips/mips-boards/sead/Makefile
+++ b/arch/mips/mips-boards/sead/Makefile
@@ -23,4 +23,4 @@
23# under Linux. 23# under Linux.
24# 24#
25 25
26obj-y := sead_int.o sead_setup.o 26obj-y := sead_int.o sead-irq.o sead_setup.o
diff --git a/arch/mips/mips-boards/sead/sead-irq.S b/arch/mips/mips-boards/sead/sead-irq.S
new file mode 100644
index 000000000000..d5dea1d2e220
--- /dev/null
+++ b/arch/mips/mips-boards/sead/sead-irq.S
@@ -0,0 +1,111 @@
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#include <asm/mips-boards/seadint.h>
32
33/*
34 * IRQs on the SEAD board look basically are combined together on hardware
35 * interrupt 0 (MIPS IRQ 2)) like:
36 *
37 * MIPS IRQ Source
38 * -------- ------
39 * 0 Software (ignored)
40 * 1 Software (ignored)
41 * 2 UART0 (hw0)
42 * 3 UART1 (hw1)
43 * 4 Hardware (ignored)
44 * 5 Hardware (ignored)
45 * 6 Hardware (ignored)
46 * 7 R4k timer (what we use)
47 *
48 * We handle the IRQ according to _our_ priority which is:
49 *
50 * Highest ---- R4k Timer
51 * Lowest ---- Combined hardware interrupt
52 *
53 * then we just return, if multiple IRQs are pending then we will just take
54 * another exception, big deal.
55 */
56
57 .text
58 .set noreorder
59 .set noat
60 .align 5
61 NESTED(mipsIRQ, PT_SIZE, sp)
62 SAVE_ALL
63 CLI
64 .set at
65
66 mfc0 s0, CP0_CAUSE # get irq bits
67 mfc0 s1, CP0_STATUS # get irq mask
68 andi s0, ST0_IM # CAUSE.CE may be non-zero!
69 and s0, s1
70
71#if defined(CONFIG_CPU_MIPS32) || defined(CONFIG_CPU_MIPS64)
72 .set mips32
73 clz a0, s0
74 .set mips0
75 negu a0
76 addu a0, 31-CAUSEB_IP
77 bltz a0, spurious
78#else
79 beqz s0, spurious
80 li a0, 7
81
82 and t0, s0, 0xf000
83 sltiu t0, t0, 1
84 sll t0, 2
85 subu a0, t0
86 sll s0, t0
87
88 and t0, s0, 0xc000
89 sltiu t0, t0, 1
90 sll t0, 1
91 subu a0, t0
92 sll s0, t0
93
94 and t0, s0, 0x8000
95 sltiu t0, t0, 1
96 # sll t0, 0
97 subu a0, t0
98 # sll s0, t0
99#endif
100
101 addu a0, MIPSCPU_INT_BASE
102 jal do_IRQ
103 move a1, sp
104
105 j ret_from_irq
106 nop
107
108spurious:
109 j spurious_interrupt
110 nop
111 END(mipsIRQ)
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-21 06:29:57 -0500