mirror of
https://github.com/torvalds/linux.git
synced 2024-12-29 06:12:08 +00:00
55 lines
1.6 KiB
ArmAsm
55 lines
1.6 KiB
ArmAsm
|
/*
|
||
|
|
* ARM Interrupt demux handler using INTC
|
||
|
|
*
|
||
|
|
* Copyright (C) 2010 Magnus Damm
|
||
|
|
* Copyright (C) 2008 Renesas Solutions Corp.
|
||
|
|
*
|
||
|
|
* 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 <asm/entry-macro-multi.S>
|
||
|
|
|
||
|
|
#define INTCA_BASE 0xe6980000
|
||
|
|
#define INTFLGA_OFFS 0x00000018 /* accept pending interrupt */
|
||
|
|
#define INTEVTA_OFFS 0x00000020 /* vector number of accepted interrupt */
|
||
|
|
#define INTLVLA_OFFS 0x00000030 /* priority level of accepted interrupt */
|
||
|
|
#define INTLVLB_OFFS 0x00000034 /* previous priority level */
|
||
|
|
|
||
|
|
.macro get_irqnr_preamble, base, tmp
|
||
|
|
ldr \base, =INTCA_BASE
|
||
|
|
.endm
|
||
|
|
|
||
|
|
.macro get_irqnr_and_base, irqnr, irqstat, base, tmp
|
||
|
|
/* The single INTFLGA read access below results in the following:
|
||
|
|
*
|
||
|
|
* 1. INTLVLB is updated with old priority value from INTLVLA
|
||
|
|
* 2. Highest priority interrupt is accepted
|
||
|
|
* 3. INTLVLA is updated to contain priority of accepted interrupt
|
||
|
|
* 4. Accepted interrupt vector is stored in INTFLGA and INTEVTA
|
||
|
|
*/
|
||
|
|
ldr \irqnr, [\base, #INTFLGA_OFFS]
|
||
|
|
|
||
|
|
/* Restore INTLVLA with the value saved in INTLVLB.
|
||
|
|
* This is required to support interrupt priorities properly.
|
||
|
|
*/
|
||
|
|
ldrb \tmp, [\base, #INTLVLB_OFFS]
|
||
|
|
strb \tmp, [\base, #INTLVLA_OFFS]
|
||
|
|
|
||
|
|
/* Handle invalid vector number case */
|
||
|
|
cmp \irqnr, #0
|
||
|
|
beq 1000f
|
||
|
|
|
||
|
|
/* Convert vector to irq number, same as the evt2irq() macro */
|
||
|
|
lsr \irqnr, \irqnr, #0x5
|
||
|
|
subs \irqnr, \irqnr, #16
|
||
|
|
|
||
|
|
1000:
|
||
|
|
.endm
|
||
|
|
|
||
|
|
.macro test_for_ipi, irqnr, irqstat, base, tmp
|
||
|
|
.endm
|
||
|
|
|
||
|
|
arch_irq_handler shmobile_handle_irq_intc
|