Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/lrg/voltage-2.6
[pandora-kernel.git] / arch / arm / mach-exynos4 / include / mach / entry-macro.S
1 /* arch/arm/mach-exynos4/include/mach/entry-macro.S
2  *
3  * Cloned from arch/arm/mach-realview/include/mach/entry-macro.S
4  *
5  * Low-level IRQ helper macros for EXYNOS4 platforms
6  *
7  * This file is licensed under  the terms of the GNU General Public
8  * License version 2. This program is licensed "as is" without any
9  * warranty of any kind, whether express or implied.
10 */
11
12 #include <mach/hardware.h>
13 #include <mach/map.h>
14 #include <asm/hardware/gic.h>
15
16                 .macro  disable_fiq
17                 .endm
18
19                 .macro  get_irqnr_preamble, base, tmp
20                 ldr     \base, =gic_cpu_base_addr
21                 ldr     \base, [\base]
22                 mrc     p15, 0, \tmp, c0, c0, 5
23                 and     \tmp, \tmp, #3
24                 cmp     \tmp, #1
25                 addeq   \base, \base, #EXYNOS4_GIC_BANK_OFFSET
26                 .endm
27
28                 .macro  arch_ret_to_user, tmp1, tmp2
29                 .endm
30
31                 /*
32                  * The interrupt numbering scheme is defined in the
33                  * interrupt controller spec.  To wit:
34                  *
35                  * Interrupts 0-15 are IPI
36                  * 16-28 are reserved
37                  * 29-31 are local.  We allow 30 to be used for the watchdog.
38                  * 32-1020 are global
39                  * 1021-1022 are reserved
40                  * 1023 is "spurious" (no interrupt)
41                  *
42                  * For now, we ignore all local interrupts so only return an interrupt if it's
43                  * between 30 and 1020.  The test_for_ipi routine below will pick up on IPIs.
44                  *
45                  * A simple read from the controller will tell us the number of the highest
46                  * priority enabled interrupt.  We then just need to check whether it is in the
47                  * valid range for an IRQ (30-1020 inclusive).
48                  */
49
50                 .macro  get_irqnr_and_base, irqnr, irqstat, base, tmp
51
52                 ldr     \irqstat, [\base, #GIC_CPU_INTACK] /* bits 12-10 = src CPU, 9-0 = int # */
53
54                 ldr     \tmp, =1021
55
56                 bic     \irqnr, \irqstat, #0x1c00
57
58                 cmp     \irqnr, #29
59                 cmpcc   \irqnr, \irqnr
60                 cmpne   \irqnr, \tmp
61                 cmpcs   \irqnr, \irqnr
62                 addne   \irqnr, \irqnr, #32
63
64                 .endm
65
66                 /* We assume that irqstat (the raw value of the IRQ acknowledge
67                  * register) is preserved from the macro above.
68                  * If there is an IPI, we immediately signal end of interrupt on the
69                  * controller, since this requires the original irqstat value which
70                  * we won't easily be able to recreate later.
71                  */
72
73                 .macro test_for_ipi, irqnr, irqstat, base, tmp
74                 bic     \irqnr, \irqstat, #0x1c00
75                 cmp     \irqnr, #16
76                 strcc   \irqstat, [\base, #GIC_CPU_EOI]
77                 cmpcs   \irqnr, \irqnr
78                 .endm
79
80                 /* As above, this assumes that irqstat and base are preserved.. */
81
82                 .macro test_for_ltirq, irqnr, irqstat, base, tmp
83                 .endm