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/* arch/arm/mach-tegra/include/mach/entry-macro.S
*
* Copyright (C) 2009 Palm, Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <mach/iomap.h>
#include <mach/io.h>
#if defined(CONFIG_ARM_GIC)
#include <asm/hardware/gic.h>
/* Uses the GIC interrupt controller built into the cpu */
#define ICTRL_BASE (IO_CPU_VIRT + 0x100)
.macro disable_fiq
.endm
.macro get_irqnr_preamble, base, tmp
movw \base, #(ICTRL_BASE & 0x0000ffff)
movt \base, #((ICTRL_BASE & 0xffff0000) >> 16)
.endm
.macro arch_ret_to_user, tmp1, tmp2
.endm
/*
* The interrupt numbering scheme is defined in the
* interrupt controller spec. To wit:
*
* Interrupts 0-15 are IPI
* 16-28 are reserved
* 29-31 are local. We allow 30 to be used for the watchdog.
* 32-1020 are global
* 1021-1022 are reserved
* 1023 is "spurious" (no interrupt)
*
* For now, we ignore all local interrupts so only return an interrupt
* if it's between 30 and 1020. The test_for_ipi routine below will
* pick up on IPIs.
*
* A simple read from the controller will tell us the number of the
* highest priority enabled interrupt. We then just need to check
* whether it is in the valid range for an IRQ (30-1020 inclusive).
*/
.macro get_irqnr_and_base, irqnr, irqstat, base, tmp
/* bits 12-10 = src CPU, 9-0 = int # */
ldr \irqstat, [\base, #GIC_CPU_INTACK]
ldr \tmp, =1021
bic \irqnr, \irqstat, #0x1c00
cmp \irqnr, #29
cmpcc \irqnr, \irqnr
cmpne \irqnr, \tmp
cmpcs \irqnr, \irqnr
.endm
/* We assume that irqstat (the raw value of the IRQ acknowledge
* register) is preserved from the macro above.
* If there is an IPI, we immediately signal end of interrupt on the
* controller, since this requires the original irqstat value which
* we won't easily be able to recreate later.
*/
.macro test_for_ipi, irqnr, irqstat, base, tmp
bic \irqnr, \irqstat, #0x1c00
cmp \irqnr, #16
strcc \irqstat, [\base, #GIC_CPU_EOI]
cmpcs \irqnr, \irqnr
.endm
/* As above, this assumes that irqstat and base are preserved.. */
.macro test_for_ltirq, irqnr, irqstat, base, tmp
bic \irqnr, \irqstat, #0x1c00
mov \tmp, #0
cmp \irqnr, #29
moveq \tmp, #1
streq \irqstat, [\base, #GIC_CPU_EOI]
cmp \tmp, #0
.endm
#else
/* legacy interrupt controller for AP16 */
.macro disable_fiq
.endm
.macro get_irqnr_preamble, base, tmp
@ enable imprecise aborts
cpsie a
@ EVP base at 0xf010f000
mov \base, #0xf0000000
orr \base, #0x00100000
orr \base, #0x0000f000
.endm
.macro arch_ret_to_user, tmp1, tmp2
.endm
.macro get_irqnr_and_base, irqnr, irqstat, base, tmp
ldr \irqnr, [\base, #0x20] @ EVT_IRQ_STS
cmp \irqnr, #0x80
.endm
#endif
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