path: root/arch/ppc/syslib/open_pic.c

/*
 *  arch/ppc/kernel/open_pic.c -- OpenPIC Interrupt Handling
 *
 *  Copyright (C) 1997 Geert Uytterhoeven
 *
 *  This file is subject to the terms and conditions of the GNU General Public
 *  License.  See the file COPYING in the main directory of this archive
 *  for more details.
 */

#include <linux/config.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/sysdev.h>
#include <linux/errno.h>
#include <asm/ptrace.h>
#include <asm/signal.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/sections.h>
#include <asm/open_pic.h>
#include <asm/i8259.h>

#include "open_pic_defs.h"

#if defined(CONFIG_PRPMC800) || defined(CONFIG_85xx)
#define OPENPIC_BIG_ENDIAN
#endif

void __iomem *OpenPIC_Addr;
static volatile struct OpenPIC __iomem *OpenPIC = NULL;

/*
 * We define OpenPIC_InitSenses table thusly:
 * bit 0x1: sense, 0 for edge and 1 for level.
 * bit 0x2: polarity, 0 for negative, 1 for positive.
 */
u_int OpenPIC_NumInitSenses __initdata = 0;
u_char *OpenPIC_InitSenses __initdata = NULL;
extern int use_of_interrupt_tree;

static u_int NumProcessors;
static u_int NumSources;
static int open_pic_irq_offset;
static volatile OpenPIC_Source __iomem *ISR[NR_IRQS];
static int openpic_cascade_irq = -1;
static int (*openpic_cascade_fn)(struct pt_regs *);

/* Global Operations */
static void openpic_disable_8259_pass_through(void);
static void openpic_set_spurious(u_int vector);

#ifdef CONFIG_SMP
/* Interprocessor Interrupts */
static void openpic_initipi(u_int ipi, u_int pri, u_int vector);
static irqreturn_t openpic_ipi_action(int cpl, void *dev_id, struct pt_regs *);
#endif

/* Timer Interrupts */
static void openpic_inittimer(u_int timer, u_int pri, u_int vector);
static void openpic_maptimer(u_int timer, cpumask_t cpumask);

/* Interrupt Sources */
static void openpic_enable_irq(u_int irq);
static void openpic_disable_irq(u_int irq);
static void openpic_initirq(u_int irq, u_int pri, u_int vector, int polarity,
			    int is_level);
static void openpic_mapirq(u_int irq, cpumask_t cpumask, cpumask_t keepmask);

/*
 * These functions are not used but the code is kept here
 * for completeness and future reference.
 */
#ifdef notused
static void openpic_enable_8259_pass_through(void);
static u_int openpic_get_spurious(void);
static void openpic_set_sense(u_int irq, int sense);
#endif /* notused */

/*
 * Description of the openpic for the higher-level irq code
 */
static void openpic_end_irq(unsigned int irq_nr);
static void openpic_ack_irq(unsigned int irq_nr);
static void openpic_set_affinity(unsigned int irq_nr, cpumask_t cpumask);

struct hw_interrupt_type open_pic = {
	.typename	= " OpenPIC  ",
	.enable		= openpic_enable_irq,
	.disable	= openpic_disable_irq,
	.ack		= openpic_ack_irq,
	.end		= openpic_end_irq,
	.set_affinity	= openpic_set_affinity,
};

#ifdef CONFIG_SMP
static void openpic_end_ipi(unsigned int irq_nr);
static void openpic_ack_ipi(unsigned int irq_nr);
static void openpic_enable_ipi(unsigned int irq_nr);
static void openpic_disable_ipi(unsigned int irq_nr);

struct hw_interrupt_type open_pic_ipi = {
	.typename	= " OpenPIC  ",
	.enable		= openpic_enable_ipi,
	.disable	= openpic_disable_ipi,
	.ack		= openpic_ack_ipi,
	.end		= openpic_end_ipi,
};
#endif /* CONFIG_SMP */

/*
 *  Accesses to the current processor's openpic registers
 */
#ifdef CONFIG_SMP
#define THIS_CPU		Processor[cpu]
#define DECL_THIS_CPU		int cpu = smp_hw_index[smp_processor_id()]
#define CHECK_THIS_CPU		check_arg_cpu(cpu)
#else
#define THIS_CPU		Processor[0]
#define DECL_THIS_CPU
#define CHECK_THIS_CPU
#endif /* CONFIG_SMP */

#if 1
#define check_arg_ipi(ipi) \
    if (ipi < 0 || ipi >= OPENPIC_NUM_IPI) \
	printk("open_pic.c:%d: invalid ipi %d\n", __LINE__, ipi);
#define check_arg_timer(timer) \
    if (timer < 0 || timer >= OPENPIC_NUM_TIMERS) \
	printk("open_pic.c:%d: invalid timer %d\n", __LINE__, timer);
#define check_arg_vec(vec) \
    if (vec < 0 || vec >= OPENPIC_NUM_VECTORS) \
	printk("open_pic.c:%d: invalid vector %d\n", __LINE__, vec);
#define check_arg_pri(pri) \
    if (pri < 0 || pri >= OPENPIC_NUM_PRI) \
	printk("open_pic.c:%d: invalid priority %d\n", __LINE__, pri);
/*
 * Print out a backtrace if it's out of range, since if it's larger than NR_IRQ's
 * data has probably been corrupted and we're going to panic or deadlock later
 * anyway --Troy
 */
#define check_arg_irq(irq) \
    if (irq < open_pic_irq_offset || irq >= NumSources+open_pic_irq_offset \
	|| ISR[irq - open_pic_irq_offset] == 0) { \
      printk("open_pic.c:%d: invalid irq %d\n", __LINE__, irq); \
      dump_stack(); }
#define check_arg_cpu(cpu) \
    if (cpu < 0 || cpu >= NumProcessors){ \
	printk("open_pic.c:%d: invalid cpu %d\n", __LINE__, cpu); \
	dump_stack(); }
#else
#define check_arg_ipi(ipi)	do {} while (0)
#define check_arg_timer(timer)	do {} while (0)
#define check_arg