diff options
| -rw-r--r-- | arch/arc/include/asm/arcregs.h | 3 | ||||
| -rw-r--r-- | arch/arc/include/asm/hw_irq.h | 7 | ||||
| -rw-r--r-- | arch/arc/include/asm/irq.h | 22 | ||||
| -rw-r--r-- | arch/arc/kernel/irq.c | 107 | ||||
| -rw-r--r-- | arch/arc/plat-arcfpga/irq.c | 15 |
5 files changed, 152 insertions, 2 deletions
diff --git a/arch/arc/include/asm/arcregs.h b/arch/arc/include/asm/arcregs.h index 8ca8faf4b80..3fccb04e6d9 100644 --- a/arch/arc/include/asm/arcregs.h +++ b/arch/arc/include/asm/arcregs.h @@ -11,6 +11,9 @@ #ifdef __KERNEL__ +/* Build Configuration Registers */ +#define ARC_REG_VECBASE_BCR 0x68 + /* status32 Bits Positions */ #define STATUS_H_BIT 0 /* CPU Halted */ #define STATUS_E1_BIT 1 /* Int 1 enable */ diff --git a/arch/arc/include/asm/hw_irq.h b/arch/arc/include/asm/hw_irq.h new file mode 100644 index 00000000000..fd565ab8969 --- /dev/null +++ b/arch/arc/include/asm/hw_irq.h @@ -0,0 +1,7 @@ +/* + * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ diff --git a/arch/arc/include/asm/irq.h b/arch/arc/include/asm/irq.h new file mode 100644 index 00000000000..ca4aeba1eed --- /dev/null +++ b/arch/arc/include/asm/irq.h @@ -0,0 +1,22 @@ +/* + * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef __ASM_ARC_IRQ_H +#define __ASM_ARC_IRQ_H + +/* Platform Independent IRQs */ +#define TIMER0_IRQ 3 +#define TIMER1_IRQ 4 + +#include <asm-generic/irq.h> + +extern void __init arc_init_IRQ(void); +extern void __init plat_init_IRQ(void); +extern int __init get_hw_config_num_irq(void); + +#endif diff --git a/arch/arc/kernel/irq.c b/arch/arc/kernel/irq.c index c4e9b25d305..2f399eb88f9 100644 --- a/arch/arc/kernel/irq.c +++ b/arch/arc/kernel/irq.c @@ -9,8 +9,111 @@ #include <linux/interrupt.h> #include <linux/module.h> -#include <asm/irqflags.h> -#include <asm/arcregs.h> +#include <asm/sections.h> +#include <asm/irq.h> + +/* + * Early Hardware specific Interrupt setup + * -Called very early (start_kernel -> setup_arch -> setup_processor) + * -Platform Independent (must for any ARC700) + * -Needed for each CPU (hence not foldable into init_IRQ) + * + * what it does ? + * -setup Vector Table Base Reg - in case Linux not linked at 0x8000_0000 + * -Disable all IRQs (on CPU side) + */ +void __init arc_init_IRQ(void) +{ + int level_mask = level_mask; + + write_aux_reg(AUX_INTR_VEC_BASE, _int_vec_base_lds); + + /* Disable all IRQs: enable them as devices request */ + write_aux_reg(AUX_IENABLE, 0); +} + +/* + * ARC700 core includes a simple on-chip intc supporting + * -per IRQ enable/disable + * -2 levels of interrupts (high/low) + * -all interrupts being level triggered + * + * To reduce platform code, we assume all IRQs directly hooked-up into intc. + * Platforms with external intc, hence cascaded IRQs, are free to over-ride + * below, per IRQ. + */ + +static void arc_mask_irq(struct irq_data *data) +{ + arch_mask_irq(data->irq); +} + +static void arc_unmask_irq(struct irq_data *data) +{ + arch_unmask_irq(data->irq); +} + +static struct irq_chip onchip_intc = { + .name = "ARC In-core Intc", + .irq_mask = arc_mask_irq, + .irq_unmask = arc_unmask_irq, +}; + +void __init init_onchip_IRQ(void) +{ + int i; + + for (i = 0; i < NR_IRQS; i++) + irq_set_chip_and_handler(i, &onchip_intc, handle_level_irq); + +#ifdef CONFIG_SMP + irq_set_chip_and_handler(TIMER0_IRQ, &onchip_intc, handle_percpu_irq); +#endif +} + +/* + * Late Interrupt system init called from start_kernel for Boot CPU only + * + * Since slab must already be initialized, platforms can start doing any + * needed request_irq( )s + */ +void __init init_IRQ(void) +{ + init_onchip_IRQ(); + plat_init_IRQ(); +} + +/* + * "C" Entry point for any ARC ISR, called from low level vector handler + * @irq is the vector number read from ICAUSE reg of on-chip intc + */ +void arch_do_IRQ(unsigned int irq, struct pt_regs *regs) +{ + struct pt_regs *old_regs = set_irq_regs(regs); + + irq_enter(); + generic_handle_irq(irq); + irq_exit(); + set_irq_regs(old_regs); +} + +int __init get_hw_config_num_irq(void) +{ + uint32_t val = read_aux_reg(ARC_REG_VECBASE_BCR); + + switch (val & 0x03) { + case 0: + return 16; + case 1: + return 32; + case 2: + return 8; + default: + return 0; + } + + return 0; +} void arch_local_irq_enable(void) { diff --git a/arch/arc/plat-arcfpga/irq.c b/arch/arc/plat-arcfpga/irq.c new file mode 100644 index 00000000000..ed726360b9f --- /dev/null +++ b/arch/arc/plat-arcfpga/irq.c @@ -0,0 +1,15 @@ +/* + * ARC FPGA Platform IRQ hookups + * + * Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/interrupt.h> + +void __init plat_init_IRQ(void) +{ +} |