diff options
Diffstat (limited to 'arch/arm/mach-shmobile/entry-intc.S')
| -rw-r--r-- | arch/arm/mach-shmobile/entry-intc.S | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/arch/arm/mach-shmobile/entry-intc.S b/arch/arm/mach-shmobile/entry-intc.S new file mode 100644 index 00000000000..cac0a7ae208 --- /dev/null +++ b/arch/arm/mach-shmobile/entry-intc.S @@ -0,0 +1,57 @@ +/* + * 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 + + .macro test_for_ltirq, irqnr, irqstat, base, tmp + .endm + + arch_irq_handler shmobile_handle_irq_intc |