LXR uboot/arch/sparc/cpu/leon3/interrupts.c

   1/*
   2 * (C) Copyright 2007
   3 * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com
   4 *
   5 * (C) Copyright 2006
   6 * Detlev Zundel, DENX Software Engineering, dzu@denx.de
   7 *
   8 * (C) Copyright -2003
   9 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  10 *
  11 * (C) Copyright 2001
  12 * Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc.
  13 *
  14 * SPDX-License-Identifier:     GPL-2.0+
  15 */
  16
  17#include <asm/stack.h>
  18#include <common.h>
  19#include <asm/io.h>
  20#include <asm/processor.h>
  21#include <command.h>
  22#include <asm/irq.h>
  23
  24#include <asm/leon.h>
  25#include <ambapp.h>
  26#include <grlib/irqmp.h>
  27#include <grlib/gptimer.h>
  28
  29/* 15 normal irqs and a non maskable interrupt */
  30#define NR_IRQS 15
  31
  32struct irq_action {
  33        interrupt_handler_t *handler;
  34        void *arg;
  35        unsigned int count;
  36};
  37
  38extern ambapp_dev_irqmp *irqmp;
  39extern ambapp_dev_gptimer *gptimer;
  40
  41static struct irq_action irq_handlers[NR_IRQS] = { {0}, };
  42static int spurious_irq_cnt = 0;
  43static int spurious_irq = 0;
  44
  45static inline unsigned int irqmp_get_irqmask(unsigned int irq)
  46{
  47        if ((irq < 0) || (irq >= NR_IRQS)) {
  48                return 0;
  49        } else {
  50                return (1 << irq);
  51        }
  52
  53}
  54
  55static void leon3_ic_disable(unsigned int irq)
  56{
  57        unsigned int mask, pil;
  58        if (!irqmp)
  59                return;
  60
  61        pil = intLock();
  62
  63        /* get mask of interrupt */
  64        mask = irqmp_get_irqmask(irq);
  65
  66        /* set int level */
  67        irqmp->cpu_mask[0] = SPARC_NOCACHE_READ(&irqmp->cpu_mask[0]) & (~mask);
  68
  69        intUnlock(pil);
  70}
  71
  72static void leon3_ic_enable(unsigned int irq)
  73{
  74        unsigned int mask, pil;
  75        if (!irqmp)
  76                return;
  77
  78        pil = intLock();
  79
  80        /* get mask of interrupt */
  81        mask = irqmp_get_irqmask(irq);
  82
  83        /* set int level */
  84        irqmp->cpu_mask[0] = SPARC_NOCACHE_READ(&irqmp->cpu_mask[0]) | mask;
  85
  86        intUnlock(pil);
  87
  88}
  89
  90void handler_irq(int irq, struct pt_regs *regs)
  91{
  92        if (irq_handlers[irq].handler) {
  93                if (((unsigned int)irq_handlers[irq].handler > CONFIG_SYS_RAM_END) ||
  94                    ((unsigned int)irq_handlers[irq].handler < CONFIG_SYS_RAM_BASE)
  95                    ) {
  96                        printf("handler_irq: bad handler: %x, irq number %d\n",
  97                               (unsigned int)irq_handlers[irq].handler, irq);
  98                        return;
  99                }
 100                irq_handlers[irq].handler(irq_handlers[irq].arg);
 101                irq_handlers[irq].count++;
 102        } else {
 103                spurious_irq_cnt++;
 104                spurious_irq = irq;
 105        }
 106}
 107
 108void leon3_force_int(int irq)
 109{
 110        if (!irqmp || (irq >= NR_IRQS) || (irq < 0))
 111                return;
 112        printf("Forcing interrupt %d\n", irq);
 113
 114        irqmp->iforce = SPARC_NOCACHE_READ(&irqmp->iforce) | (1 << irq);
 115}
 116
 117/****************************************************************************/
 118
 119int interrupt_init_cpu(void)
 120{
 121
 122        return (0);
 123}
 124
 125/****************************************************************************/
 126
 127/*
 128 * Install and free a interrupt handler.
 129 */
 130
 131void irq_install_handler(int irq, interrupt_handler_t * handler, void *arg)
 132{
 133        if (irq < 0 || irq >= NR_IRQS) {
 134                printf("irq_install_handler: bad irq number %d\n", irq);
 135                return;
 136        }
 137
 138        if (irq_handlers[irq].handler != NULL)
 139                printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
 140                       (ulong) handler, (ulong) irq_handlers[irq].handler);
 141
 142        if (((unsigned int)handler > CONFIG_SYS_RAM_END) ||
 143            ((unsigned int)handler < CONFIG_SYS_RAM_BASE)
 144            ) {
 145                printf("irq_install_handler: bad handler: %x, irq number %d\n",
 146                       (unsigned int)handler, irq);
 147                return;
 148        }
 149        irq_handlers[irq].handler = handler;
 150        irq_handlers[irq].arg = arg;
 151
 152        /* enable irq on IRQMP hardware */
 153        leon3_ic_enable(irq);
 154
 155}
 156
 157void irq_free_handler(int irq)
 158{
 159        if (irq < 0 || irq >= NR_IRQS) {
 160                printf("irq_free_handler: bad irq number %d\n", irq);
 161                return;
 162        }
 163
 164        /* disable irq on IRQMP hardware */
 165        leon3_ic_disable(irq);
 166
 167        irq_handlers[irq].handler = NULL;
 168        irq_handlers[irq].arg = NULL;
 169}
 170
 171/****************************************************************************/
 172
 173#if defined(CONFIG_CMD_IRQ)
 174void do_irqinfo(cmd_tbl_t * cmdtp, bd_t * bd, int flag, int argc, char * const argv[])
 175{
 176        int irq;
 177        unsigned int pil = get_pil();
 178        printf("PIL level: %u\n\r", pil);
 179        printf("Spurious IRQ: %u, last unknown IRQ: %d\n",
 180               spurious_irq_cnt, spurious_irq);
 181
 182        puts("\nInterrupt-Information:\n" "Nr  Routine   Arg       Count\n");
 183
 184        for (irq = 0; irq < NR_IRQS; irq++) {
 185                if (irq_handlers[irq].handler != NULL) {
 186                        printf("%02d  %p  %p  %d\n", irq,
 187                               irq_handlers[irq].handler,
 188                               irq_handlers[irq].arg,
 189                               irq_handlers[irq].count);
 190                }
 191        }
 192}
 193#endif
 194