mirror of
https://github.com/brain-hackers/u-boot-brain
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143 lines
4.6 KiB
C
143 lines
4.6 KiB
C
/*
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* U-boot - irq.h Interrupt related header file
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*
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* Copyright (c) 2005 blackfin.uclinux.org
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*
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* This file was based on
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* linux/arch/$(ARCH)/platform/$(PLATFORM)/irq.c
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*
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* Changed by HuTao Apr18, 2003
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*
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* Copyright was missing when I got the code so took from MIPS arch ...MaTed---
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* Copyright (C) 1994 by Waldorf GMBH, written by Ralf Baechle
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* Copyright (C) 1995, 96, 97, 98, 99, 2000, 2001 by Ralf Baechle
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*
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* Adapted for BlackFin (ADI) by Ted Ma <mated@sympatico.ca>
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* Copyright (c) 2002 Arcturus Networks Inc. (www.arcturusnetworks.com)
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* Copyright (c) 2002 Lineo, Inc. <mattw@lineo.com>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#ifndef _BLACKFIN_IRQ_H_
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#define _BLACKFIN_IRQ_H_
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#include <linux/config.h>
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#include <asm/cpu/bf533_irq.h>
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/*
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* On the Blackfin, the interrupt structure allows remmapping of the hardware
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* levels.
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* - I'm going to assume that the H/W level is going to stay at the default
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* settings. If someone wants to go through and abstart this out, feel free
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* to mod the interrupt numbering scheme.
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* - I'm abstracting the interrupts so that uClinux does not know anything
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* about the H/W levels. If you want to change the H/W AND keep the abstracted
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* levels that uClinux sees, you should be able to do most of it here.
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* - I've left the "abstract" numbering sparce in case someone wants to pull the
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* interrupts apart (just the TX/RX for the various devices)
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*/
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#define NR_IRQS SYS_IRQS
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/*
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* "Generic" interrupt sources
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*/
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#define IRQ_SCHED_TIMER (8) /* interrupt source for scheduling timer */
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static __inline__ int irq_cannonicalize(int irq)
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{
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return irq;
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}
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/*
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* Machine specific interrupt sources.
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*
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* Adding an interrupt service routine for a source with this bit
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* set indicates a special machine specific interrupt source.
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* The machine specific files define these sources.
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*
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* The IRQ_MACHSPEC bit is now gone - the only thing it did was to
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* introduce unnecessary overhead.
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*
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* All interrupt handling is actually machine specific so it is better
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* to use function pointers, as used by the Sparc port, and select the
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* interrupt handling functions when initializing the kernel. This way
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* we save some unnecessary overhead at run-time.
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* 01/11/97 - Jes
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*/
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extern void (*mach_enable_irq) (unsigned int);
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extern void (*mach_disable_irq) (unsigned int);
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extern int sys_request_irq(unsigned int,
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void (*)(int, void *, struct pt_regs *),
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unsigned long, const char *, void *);
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extern void sys_free_irq(unsigned int, void *);
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/*
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* various flags for request_irq() - the Amiga now uses the standard
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* mechanism like all other architectures - SA_INTERRUPT and SA_SHIRQ
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* are your friends.
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*/
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#define IRQ_FLG_LOCK (0x0001) /* handler is not replaceable */
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#define IRQ_FLG_REPLACE (0x0002) /* replace existing handler */
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#define IRQ_FLG_FAST (0x0004)
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#define IRQ_FLG_SLOW (0x0008)
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#define IRQ_FLG_STD (0x8000) /* internally used */
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/*
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* This structure is used to chain together the ISRs for a particular
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* interrupt source (if it supports chaining).
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*/
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typedef struct irq_node {
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void (*handler) (int, void *, struct pt_regs *);
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unsigned long flags;
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void *dev_id;
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const char *devname;
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struct irq_node *next;
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} irq_node_t;
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/*
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* This structure has only 4 elements for speed reasons
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*/
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typedef struct irq_handler {
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void (*handler) (int, void *, struct pt_regs *);
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unsigned long flags;
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void *dev_id;
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const char *devname;
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} irq_handler_t;
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/* count of spurious interrupts */
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extern volatile unsigned int num_spurious;
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/*
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* This function returns a new irq_node_t
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*/
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extern irq_node_t *new_irq_node(void);
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/*
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* Some drivers want these entry points
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*/
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#define enable_irq(x) (mach_enable_irq ? (*mach_enable_irq)(x) : 0)
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#define disable_irq(x) (mach_disable_irq ? (*mach_disable_irq)(x) : 0)
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#define enable_irq_nosync(x) enable_irq(x)
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#define disable_irq_nosync(x) disable_irq(x)
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#endif
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