ARC: Interrupt Handling (bacdf480) · Commits · e / devices / android_kernel_fairphone_FP4

arch/arc/include/asm/arcregs.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -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 */

arch/arc/include/asm/hw_irq.h

0 → 100644

+7 −0

Original line number	Diff line number	Diff line
		/*
		* 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.
		*/

arch/arc/include/asm/irq.h

0 → 100644

+22 −0

Original line number	Diff line number	Diff line
		/*
		* 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

arch/arc/kernel/irq.c

+105 −2

Original line number	Diff line number	Diff line
		@@ -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)
		{

arch/arc/plat-arcfpga/irq.c

0 → 100644

+15 −0

Original line number	Diff line number	Diff line
		/*
		* 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)
		{
		}