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-rw-r--r--arch/arm/mach-spear6xx/include/mach/entry-macro.S55
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
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+++ b/arch/arm/mach-spear6xx/include/mach/entry-macro.S
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+/*
+ * arch/arm/mach-spear6xx/include/mach/entry-macro.S
+ *
+ * Low-level IRQ helper macros for SPEAr6xx machine family
+ *
+ * Copyright (C) 2009 ST Microelectronics
+ * Rajeev Kumar<rajeev-dlh.kumar@st.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <mach/hardware.h>
+#include <mach/spear.h>
+#include <asm/hardware/vic.h>
+
+ .macro disable_fiq
+ .endm
+
+ .macro get_irqnr_preamble, base, tmp
+ .endm
+
+ .macro arch_ret_to_user, tmp1, tmp2
+ .endm
+
+ .macro get_irqnr_and_base, irqnr, irqstat, base, tmp
+ ldr \base, =VA_SPEAR6XX_CPU_VIC_PRI_BASE
+ ldr \irqstat, [\base, #VIC_IRQ_STATUS] @ get status
+ mov \irqnr, #0
+ teq \irqstat, #0
+ bne 1001f
+ ldr \base, =VA_SPEAR6XX_CPU_VIC_SEC_BASE
+ ldr \irqstat, [\base, #VIC_IRQ_STATUS] @ get status
+ teq \irqstat, #0
+ beq 1002f @ this will set/reset
+ @ zero register
+ mov \irqnr, #32
+1001:
+ /*
+ * Following code will find bit position of least significang
+ * bit set in irqstat, using following equation
+ * least significant bit set in n = (n & ~(n-1))
+ */
+ sub \tmp, \irqstat, #1 @ tmp = irqstat - 1
+ mvn \tmp, \tmp @ tmp = ~tmp
+ and \irqstat, \irqstat, \tmp @ irqstat &= tmp
+ /* Now, irqstat is = bit no. of 1st bit set in vic irq status */
+ clz \tmp, \irqstat @ tmp = leading zeros
+
+ rsb \tmp, \tmp, #0x1F @ tmp = 32 - tmp - 1
+ add \irqnr, \irqnr, \tmp
+
+1002: /* EQ will be set if no irqs pending */
+ .endm