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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-arm/arch-s3c2410/entry-macro.S
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'include/asm-arm/arch-s3c2410/entry-macro.S')
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1 files changed, 119 insertions, 0 deletions
diff --git a/include/asm-arm/arch-s3c2410/entry-macro.S b/include/asm-arm/arch-s3c2410/entry-macro.S
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1/*
2 * include/asm-arm/arch-s3c2410/entry-macro.S
3 *
4 * Low-level IRQ helper macros for S3C2410-based platforms
5 *
6 * This file is licensed under the terms of the GNU General Public
7 * License version 2. This program is licensed "as is" without any
8 * warranty of any kind, whether express or implied.
9
10 * Modifications:
11 * 10-Mar-2005 LCVR Changed S3C2410_VA to S3C24XX_VA
12 */
13
14
15 .macro get_irqnr_and_base, irqnr, irqstat, base, tmp
16
17 mov \tmp, #S3C24XX_VA_IRQ
18 ldr \irqnr, [ \tmp, #0x14 ] @ get irq no
1930000:
20 teq \irqnr, #4
21 teqne \irqnr, #5
22 beq 1002f @ external irq reg
23
24 @ debug check to see if interrupt reported is the same
25 @ as the offset....
26
27 teq \irqnr, #0
28 beq 20002f
29 ldr \irqstat, [ \tmp, #0x10 ] @ INTPND
30 mov \irqstat, \irqstat, lsr \irqnr
31 tst \irqstat, #1
32 bne 20002f
33
34 /* debug/warning if we get an invalud response from the
35 * INTOFFSET register */
36#if 1
37 stmfd r13!, { r0 - r4 , r8-r12, r14 }
38 ldr r1, [ \tmp, #0x14 ] @ INTOFFSET
39 ldr r2, [ \tmp, #0x10 ] @ INTPND
40 ldr r3, [ \tmp, #0x00 ] @ SRCPND
41 adr r0, 20003f
42 bl printk
43 b 20004f
44
4520003:
46 .ascii "<7>irq: err - bad offset %d, intpnd=%08x, srcpnd=%08x\n"
47 .byte 0
48 .align 4
4920004:
50 mov r1, #1
51 mov \tmp, #S3C24XX_VA_IRQ
52 ldmfd r13!, { r0 - r4 , r8-r12, r14 }
53#endif
54
55 @ try working out interrupt number for ourselves
56 mov \irqnr, #0
57 ldr \irqstat, [ \tmp, #0x10 ] @ INTPND
5810021:
59 movs \irqstat, \irqstat, lsr#1
60 bcs 30000b @ try and re-start the proccess
61 add \irqnr, \irqnr, #1
62 cmp \irqnr, #32
63 ble 10021b
64
65 @ found no interrupt, set Z flag and leave
66 movs \irqnr, #0
67 b 1001f
68
6920005:
7020002: @ exit
71 @ we base the s3c2410x interrupts at 16 and above to allow
72 @ isa peripherals to have their standard interrupts, also
73 @ ensure that Z flag is un-set on exit
74
75 @ note, we cannot be sure if we get IRQ_EINT0 (0) that
76 @ there is simply no interrupt pending, so in all other
77 @ cases we jump to say we have found something, otherwise
78 @ we check to see if the interrupt really is assrted
79 adds \irqnr, \irqnr, #IRQ_EINT0
80 teq \irqnr, #IRQ_EINT0
81 bne 1001f @ exit
82 ldr \irqstat, [ \tmp, #0x10 ] @ INTPND
83 teq \irqstat, #0
84 moveq \irqnr, #0
85 b 1001f
86
87 @ we get here from no main or external interrupts pending
881002:
89 add \tmp, \tmp, #S3C24XX_VA_GPIO - S3C24XX_VA_IRQ
90 ldr \irqstat, [ \tmp, # 0xa8 ] @ EXTINTPEND
91 ldr \irqnr, [ \tmp, # 0xa4 ] @ EXTINTMASK
92
93 bic \irqstat, \irqstat, \irqnr @ clear masked irqs
94
95 mov \irqnr, #IRQ_EINT4 @ start extint nos
96 mov \irqstat, \irqstat, lsr#4 @ ignore bottom 4 bits
9710021:
98 movs \irqstat, \irqstat, lsr#1
99 bcs 1004f
100 add \irqnr, \irqnr, #1
101 cmp \irqnr, #IRQ_EINT23
102 ble 10021b
103
104 @ found no interrupt, set Z flag and leave
105 movs \irqnr, #0
106
1071004: @ ensure Z flag clear in case our MOVS shifted out the last bit
108 teq \irqnr, #0
1091001:
110 @ exit irq routine
111 .endm
112
113
114 /* currently don't need an disable_fiq macro */
115
116 .macro disable_fiq
117 .endm
118
119