| Magnus Damm | 863b171 | 2010-12-28 08:27:01 +0000 | [diff] [blame] | 1 | /* |
| 2 | * ARM Interrupt demux handler using INTC |
| 3 | * |
| 4 | * Copyright (C) 2010 Magnus Damm |
| 5 | * Copyright (C) 2008 Renesas Solutions Corp. |
| 6 | * |
| 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. |
| 10 | */ |
| 11 | |
| 12 | #include <asm/entry-macro-multi.S> |
| 13 | |
| 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 */ |
| 19 | |
| 20 | .macro get_irqnr_preamble, base, tmp |
| 21 | ldr \base, =INTCA_BASE |
| 22 | .endm |
| 23 | |
| 24 | .macro get_irqnr_and_base, irqnr, irqstat, base, tmp |
| 25 | /* The single INTFLGA read access below results in the following: |
| 26 | * |
| 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 |
| 31 | */ |
| 32 | ldr \irqnr, [\base, #INTFLGA_OFFS] |
| 33 | |
| 34 | /* Restore INTLVLA with the value saved in INTLVLB. |
| 35 | * This is required to support interrupt priorities properly. |
| 36 | */ |
| 37 | ldrb \tmp, [\base, #INTLVLB_OFFS] |
| 38 | strb \tmp, [\base, #INTLVLA_OFFS] |
| 39 | |
| 40 | /* Handle invalid vector number case */ |
| 41 | cmp \irqnr, #0 |
| 42 | beq 1000f |
| 43 | |
| 44 | /* Convert vector to irq number, same as the evt2irq() macro */ |
| 45 | lsr \irqnr, \irqnr, #0x5 |
| 46 | subs \irqnr, \irqnr, #16 |
| 47 | |
| 48 | 1000: |
| 49 | .endm |
| 50 | |
| 51 | .macro test_for_ipi, irqnr, irqstat, base, tmp |
| 52 | .endm |
| 53 | |
| Magnus Damm | 863b171 | 2010-12-28 08:27:01 +0000 | [diff] [blame] | 54 | arch_irq_handler shmobile_handle_irq_intc |