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Diffstat (limited to 'arch/arm/mach-spear3xx/include/mach/entry-macro.S')
| -rw-r--r-- | arch/arm/mach-spear3xx/include/mach/entry-macro.S | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/arch/arm/mach-spear3xx/include/mach/entry-macro.S b/arch/arm/mach-spear3xx/include/mach/entry-macro.S new file mode 100644 index 00000000000..53da4224ba3 --- /dev/null +++ b/arch/arm/mach-spear3xx/include/mach/entry-macro.S | |||
| @@ -0,0 +1,45 @@ | |||
| 1 | /* | ||
| 2 | * arch/arm/mach-spear3xx/include/mach/entry-macro.S | ||
| 3 | * | ||
| 4 | * Low-level IRQ helper macros for SPEAr3xx machine family | ||
| 5 | * | ||
| 6 | * Copyright (C) 2009 ST Microelectronics | ||
| 7 | * Viresh Kumar<viresh.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 <asm/hardware/vic.h> | ||
| 15 | #include <mach/hardware.h> | ||
| 16 | |||
| 17 | .macro disable_fiq | ||
| 18 | .endm | ||
| 19 | |||
| 20 | .macro get_irqnr_preamble, base, tmp | ||
| 21 | .endm | ||
| 22 | |||
| 23 | .macro arch_ret_to_user, tmp1, tmp2 | ||
| 24 | .endm | ||
| 25 | |||
| 26 | .macro get_irqnr_and_base, irqnr, irqstat, base, tmp | ||
| 27 | ldr \base, =VA_SPEAR3XX_ML1_VIC_BASE | ||
| 28 | ldr \irqstat, [\base, #VIC_IRQ_STATUS] @ get status | ||
| 29 | teq \irqstat, #0 | ||
| 30 | beq 1001f @ this will set/reset | ||
| 31 | @ zero register | ||
| 32 | /* | ||
| 33 | * Following code will find bit position of least significang | ||
| 34 | * bit set in irqstat, using following equation | ||
| 35 | * least significant bit set in n = (n & ~(n-1)) | ||
| 36 | */ | ||
| 37 | sub \tmp, \irqstat, #1 @ tmp = irqstat - 1 | ||
| 38 | mvn \tmp, \tmp @ tmp = ~tmp | ||
| 39 | and \irqstat, \irqstat, \tmp @ irqstat &= tmp | ||
| 40 | /* Now, irqstat is = bit no. of 1st bit set in vic irq status */ | ||
| 41 | clz \tmp, \irqstat @ tmp = leading zeros | ||
| 42 | rsb \irqnr, \tmp, #0x1F @ irqnr = 32 - tmp - 1 | ||
| 43 | |||
| 44 | 1001: /* EQ will be set if no irqs pending */ | ||
| 45 | .endm | ||