2 * ARM Interrupt demux handler using INTC
4 * Copyright (C) 2010 Magnus Damm
5 * Copyright (C) 2008 Renesas Solutions Corp.
7 * This file is licensed under the terms of the GNU General Public
8 * License version 2. This program is licensed "as is" without any
9 * warranty of any kind, whether express or implied.
12 #include <asm/entry-macro-multi.S>
14 #define INTCA_BASE 0xe6980000
15 #define INTFLGA_OFFS 0x00000018 /* accept pending interrupt */
16 #define INTEVTA_OFFS 0x00000020 /* vector number of accepted interrupt */
17 #define INTLVLA_OFFS 0x00000030 /* priority level of accepted interrupt */
18 #define INTLVLB_OFFS 0x00000034 /* previous priority level */
20 .macro get_irqnr_preamble, base, tmp
21 ldr \base, =INTCA_BASE
24 .macro get_irqnr_and_base, irqnr, irqstat, base, tmp
25 /* The single INTFLGA read access below results in the following:
27 * 1. INTLVLB is updated with old priority value from INTLVLA
28 * 2. Highest priority interrupt is accepted
29 * 3. INTLVLA is updated to contain priority of accepted interrupt
30 * 4. Accepted interrupt vector is stored in INTFLGA and INTEVTA
32 ldr \irqnr, [\base, #INTFLGA_OFFS]
34 /* Restore INTLVLA with the value saved in INTLVLB.
35 * This is required to support interrupt priorities properly.
37 ldrb \tmp, [\base, #INTLVLB_OFFS]
38 strb \tmp, [\base, #INTLVLA_OFFS]
40 /* Handle invalid vector number case */
44 /* Convert vector to irq number, same as the evt2irq() macro */
45 lsr \irqnr, \irqnr, #0x5
46 subs \irqnr, \irqnr, #16
51 .macro test_for_ipi, irqnr, irqstat, base, tmp
54 arch_irq_handler shmobile_handle_irq_intc