arch/sparc/cpu/leon2/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
  26 /* 15 normal irqs and a non maskable interrupt */
  27 #define NR_IRQS 15
  28
  29 struct irq_action {
  30         interrupt_handler_t *handler;
  31         void *arg;
  32         unsigned int count;
  33 };
  34
  35 static struct irq_action irq_handlers[NR_IRQS] = { {0}, };
  36 static int spurious_irq_cnt = 0;
  37 static int spurious_irq = 0;
  38
  39 static inline unsigned int leon2_get_irqmask(unsigned int irq)
  40 {
  41         if ((irq < 0) || (irq >= NR_IRQS)) {
  42                 return 0;
  43         } else {
  44                 return (1 << irq);
  45         }
  46 }
  47
  48 static void leon2_ic_disable(unsigned int irq)
  49 {
  50         unsigned int mask, pil;
  51         LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
  52
  53         pil = intLock();
  54
  55         /* get mask of interrupt */
  56         mask = leon2_get_irqmask(irq);
  57
  58         /* set int level */
  59         leon2->Interrupt_Mask =
  60             SPARC_NOCACHE_READ(&leon2->Interrupt_Mask) & (~mask);
  61
  62         intUnlock(pil);
  63 }
  64
  65 static void leon2_ic_enable(unsigned int irq)
  66 {
  67         unsigned int mask, pil;
  68         LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
  69
  70         pil = intLock();
  71
  72         /* get mask of interrupt */
  73         mask = leon2_get_irqmask(irq);
  74
  75         /* set int level */
  76         leon2->Interrupt_Mask =
  77             SPARC_NOCACHE_READ(&leon2->Interrupt_Mask) | mask;
  78
  79         intUnlock(pil);
  80 }
  81
  82 void handler_irq(int irq, struct pt_regs *regs)
  83 {
  84         if (irq_handlers[irq].handler) {
  85                 if (((unsigned int)irq_handlers[irq].handler > CONFIG_SYS_RAM_END) ||
  86                     ((unsigned int)irq_handlers[irq].handler < CONFIG_SYS_RAM_BASE)
  87                     ) {
  88                         printf("handler_irq: bad handler: %x, irq number %d\n",
  89                                (unsigned int)irq_handlers[irq].handler, irq);
  90                         return;
  91                 }
  92                 irq_handlers[irq].handler(irq_handlers[irq].arg);
  93                 irq_handlers[irq].count++;
  94         } else {
  95                 spurious_irq_cnt++;
  96                 spurious_irq = irq;
  97         }
  98 }
  99
 100 void leon2_force_int(int irq)
 101 {
 102         LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
 103
 104         if ((irq >= NR_IRQS) || (irq < 0))
 105                 return;
 106         printf("Forcing interrupt %d\n", irq);
 107
 108         leon2->Interrupt_Force =
 109             SPARC_NOCACHE_READ(&leon2->Interrupt_Force) | (1 << irq);
 110 }
 111
 112 /****************************************************************************/
 113
 114 int interrupt_init_cpu(void)
 115 {
 116         return (0);
 117 }
 118
 119 /****************************************************************************/
 120
 121 /*
 122  * Install and free a interrupt handler.
 123  */
 124
 125 void irq_install_handler(int irq, interrupt_handler_t * handler, void *arg)
 126 {
 127         if (irq < 0 || irq >= NR_IRQS) {
 128                 printf("irq_install_handler: bad irq number %d\n", irq);
 129                 return;
 130         }
 131
 132         if (irq_handlers[irq].handler != NULL)
 133                 printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
 134                        (ulong) handler, (ulong) irq_handlers[irq].handler);
 135
 136         if (((unsigned int)handler > CONFIG_SYS_RAM_END) ||
 137             ((unsigned int)handler < CONFIG_SYS_RAM_BASE)
 138             ) {
 139                 printf("irq_install_handler: bad handler: %x, irq number %d\n",
 140                        (unsigned int)handler, irq);
 141                 return;
 142         }
 143         irq_handlers[irq].handler = handler;
 144         irq_handlers[irq].arg = arg;
 145
 146         /* enable irq on LEON2 hardware */
 147         leon2_ic_enable(irq);
 148
 149 }
 150
 151 void irq_free_handler(int irq)
 152 {
 153         if (irq < 0 || irq >= NR_IRQS) {
 154                 printf("irq_free_handler: bad irq number %d\n", irq);
 155                 return;
 156         }
 157
 158         /* disable irq on LEON2 hardware */
 159         leon2_ic_disable(irq);
 160
 161         irq_handlers[irq].handler = NULL;
 162         irq_handlers[irq].arg = NULL;
 163 }
 164
 165 /****************************************************************************/
 166
 167 #if defined(CONFIG_CMD_IRQ)
 168 void do_irqinfo(cmd_tbl_t * cmdtp, bd_t * bd, int flag, int argc, char * const argv[])
 169 {
 170         int irq;
 171         unsigned int pil = get_pil();
 172         printf("PIL level: %u\n\r", pil);
 173         printf("Spurious IRQ: %u, last unknown IRQ: %d\n",
 174                spurious_irq_cnt, spurious_irq);
 175
 176         puts("\nInterrupt-Information:\n" "Nr  Routine   Arg       Count\n");
 177
 178         for (irq = 0; irq < NR_IRQS; irq++) {
 179                 if (irq_handlers[irq].handler != NULL) {
 180                         printf("%02d  %p  %p  %d\n", irq,
 181                                irq_handlers[irq].handler,
 182                                irq_handlers[irq].arg,
 183                                irq_handlers[irq].count);
 184                 }
 185         }
 186 }
 187 #endif