diff options
Diffstat (limited to 'arch/arm/mach-spear6xx/include/mach/entry-macro.S')
-rw-r--r-- | arch/arm/mach-spear6xx/include/mach/entry-macro.S | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/arch/arm/mach-spear6xx/include/mach/entry-macro.S b/arch/arm/mach-spear6xx/include/mach/entry-macro.S new file mode 100644 index 00000000000..9eaecaeafcf --- /dev/null +++ b/arch/arm/mach-spear6xx/include/mach/entry-macro.S | |||
@@ -0,0 +1,55 @@ | |||
1 | /* | ||
2 | * arch/arm/mach-spear6xx/include/mach/entry-macro.S | ||
3 | * | ||
4 | * Low-level IRQ helper macros for SPEAr6xx machine family | ||
5 | * | ||
6 | * Copyright (C) 2009 ST Microelectronics | ||
7 | * Rajeev Kumar<rajeev-dlh.kumar@st.com> | ||
8 | * | ||
9 | * This file is licensed under the terms of the GNU General Public | ||
10 | * License version 2. This program is licensed "as is" without any | ||
11 | * warranty of any kind, whether express or implied. | ||
12 | */ | ||
13 | |||
14 | #include <mach/hardware.h> | ||
15 | #include <mach/spear.h> | ||
16 | #include <asm/hardware/vic.h> | ||
17 | |||
18 | .macro disable_fiq | ||
19 | .endm | ||
20 | |||
21 | .macro get_irqnr_preamble, base, tmp | ||
22 | .endm | ||
23 | |||
24 | .macro arch_ret_to_user, tmp1, tmp2 | ||
25 | .endm | ||
26 | |||
27 | .macro get_irqnr_and_base, irqnr, irqstat, base, tmp | ||
28 | ldr \base, =VA_SPEAR6XX_CPU_VIC_PRI_BASE | ||
29 | ldr \irqstat, [\base, #VIC_IRQ_STATUS] @ get status | ||
30 | mov \irqnr, #0 | ||
31 | teq \irqstat, #0 | ||
32 | bne 1001f | ||
33 | ldr \base, =VA_SPEAR6XX_CPU_VIC_SEC_BASE | ||
34 | ldr \irqstat, [\base, #VIC_IRQ_STATUS] @ get status | ||
35 | teq \irqstat, #0 | ||
36 | beq 1002f @ this will set/reset | ||
37 | @ zero register | ||
38 | mov \irqnr, #32 | ||
39 | 1001: | ||
40 | /* | ||
41 | * Following code will find bit position of least significang | ||
42 | * bit set in irqstat, using following equation | ||
43 | * least significant bit set in n = (n & ~(n-1)) | ||
44 | */ | ||
45 | sub \tmp, \irqstat, #1 @ tmp = irqstat - 1 | ||
46 | mvn \tmp, \tmp @ tmp = ~tmp | ||
47 | and \irqstat, \irqstat, \tmp @ irqstat &= tmp | ||
48 | /* Now, irqstat is = bit no. of 1st bit set in vic irq status */ | ||
49 | clz \tmp, \irqstat @ tmp = leading zeros | ||
50 | |||
51 | rsb \tmp, \tmp, #0x1F @ tmp = 32 - tmp - 1 | ||
52 | add \irqnr, \irqnr, \tmp | ||
53 | |||
54 | 1002: /* EQ will be set if no irqs pending */ | ||
55 | .endm | ||