| /* |
| * arch/arm/mach-spear3xx/include/mach/entry-macro.S |
| * |
| * Low-level IRQ helper macros for SPEAr3xx machine family |
| * |
| * Copyright (C) 2009 ST Microelectronics |
| * Viresh Kumar<viresh.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_SPEAR3XX_ML1_VIC_BASE |
| ldr \irqstat, [\base, #VIC_IRQ_STATUS] @ get status |
| teq \irqstat, #0 |
| beq 1001f @ this will set/reset |
| @ zero register |
| /* |
| * 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 \irqnr, \tmp, #0x1F @ irqnr = 32 - tmp - 1 |
| |
| 1001: /* EQ will be set if no irqs pending */ |
| .endm |
