arch/microblaze/cpu/interrupts.c

   1 /*
   2  * (C) Copyright 2007 Michal Simek
   3  * (C) Copyright 2004 Atmark Techno, Inc.
   4  *
   5  * Michal  SIMEK <monstr@monstr.eu>
   6  * Yasushi SHOJI <yashi@atmark-techno.com>
   7  *
   8  * SPDX-License-Identifier:     GPL-2.0+
   9  */
  10
  11 #include <common.h>
  12 #include <command.h>
  13 #include <malloc.h>
  14 #include <asm/microblaze_intc.h>
  15 #include <asm/asm.h>
  16
  17 #undef DEBUG_INT
  18
  19 void enable_interrupts(void)
  20 {
  21         MSRSET(0x2);
  22 }
  23
  24 int disable_interrupts(void)
  25 {
  26         unsigned int msr;
  27
  28         MFS(msr, rmsr);
  29         MSRCLR(0x2);
  30         return (msr & 0x2) != 0;
  31 }
  32
  33 static struct irq_action *vecs;
  34 static u32 irq_no;
  35
  36 /* mapping structure to interrupt controller */
  37 microblaze_intc_t *intc;
  38
  39 /* default handler */
  40 static void def_hdlr(void)
  41 {
  42         puts("def_hdlr\n");
  43 }
  44
  45 static void enable_one_interrupt(int irq)
  46 {
  47         int mask;
  48         int offset = 1;
  49
  50         offset <<= irq;
  51         mask = intc->ier;
  52         intc->ier = (mask | offset);
  53 #ifdef DEBUG_INT
  54         printf("Enable one interrupt irq %x - mask %x,ier %x\n", offset, mask,
  55                 intc->ier);
  56         printf("INTC isr %x, ier %x, iar %x, mer %x\n", intc->isr, intc->ier,
  57                 intc->iar, intc->mer);
  58 #endif
  59 }
  60
  61 static void disable_one_interrupt(int irq)
  62 {
  63         int mask;
  64         int offset = 1;
  65
  66         offset <<= irq;
  67         mask = intc->ier;
  68         intc->ier = (mask & ~offset);
  69 #ifdef DEBUG_INT
  70         printf("Disable one interrupt irq %x - mask %x,ier %x\n", irq, mask,
  71                 intc->ier);
  72         printf("INTC isr %x, ier %x, iar %x, mer %x\n", intc->isr, intc->ier,
  73                 intc->iar, intc->mer);
  74 #endif
  75 }
  76
  77 int install_interrupt_handler(int irq, interrupt_handler_t *hdlr, void *arg)
  78 {
  79         struct irq_action *act;
  80
  81         /* irq out of range */
  82         if ((irq < 0) || (irq > irq_no)) {
  83                 puts("IRQ out of range\n");
  84                 return -1;
  85         }
  86         act = &vecs[irq];
  87         if (hdlr) {             /* enable */
  88                 act->handler = hdlr;
  89                 act->arg = arg;
  90                 act->count = 0;
  91                 enable_one_interrupt (irq);
  92                 return 0;
  93         }
  94
  95         /* Disable */
  96         act->handler = (interrupt_handler_t *) def_hdlr;
  97         act->arg = (void *)irq;
  98         disable_one_interrupt(irq);
  99         return 1;
 100 }
 101
 102 /* initialization interrupt controller - hardware */
 103 static void intc_init(void)
 104 {
 105         intc->mer = 0;
 106         intc->ier = 0;
 107         intc->iar = 0xFFFFFFFF;
 108         /* XIntc_Start - hw_interrupt enable and all interrupt enable */
 109         intc->mer = 0x3;
 110 #ifdef DEBUG_INT
 111         printf("INTC isr %x, ier %x, iar %x, mer %x\n", intc->isr, intc->ier,
 112                 intc->iar, intc->mer);
 113 #endif
 114 }
 115
 116 int interrupts_init(void)
 117 {
 118         int i;
 119
 120 #if defined(CONFIG_SYS_INTC_0_ADDR) && defined(CONFIG_SYS_INTC_0_NUM)
 121         intc = (microblaze_intc_t *) (CONFIG_SYS_INTC_0_ADDR);
 122         irq_no = CONFIG_SYS_INTC_0_NUM;
 123 #endif
 124         if (irq_no) {
 125                 vecs = calloc(1, sizeof(struct irq_action) * irq_no);
 126                 if (vecs == NULL) {
 127                         puts("Interrupt vector allocation failed\n");
 128                         return -1;
 129                 }
 130
 131                 /* initialize irq list */
 132                 for (i = 0; i < irq_no; i++) {
 133                         vecs[i].handler = (interrupt_handler_t *) def_hdlr;
 134                         vecs[i].arg = (void *)i;
 135                         vecs[i].count = 0;
 136                 }
 137                 /* initialize intc controller */
 138                 intc_init();
 139                 enable_interrupts();
 140         } else {
 141                 puts("Undefined interrupt controller\n");
 142         }
 143         return 0;
 144 }
 145
 146 void interrupt_handler(void)
 147 {
 148         int irqs = intc->ivr;   /* find active interrupt */
 149         int mask = 1;
 150 #ifdef DEBUG_INT
 151         int value;
 152         printf ("INTC isr %x, ier %x, iar %x, mer %x\n", intc->isr, intc->ier,
 153                 intc->iar, intc->mer);
 154         R14(value);
 155         printf ("Interrupt handler on %x line, r14 %x\n", irqs, value);
 156 #endif
 157         struct irq_action *act = vecs + irqs;
 158
 159 #ifdef DEBUG_INT
 160         printf
 161             ("Jumping to interrupt handler rutine addr %x,count %x,arg %x\n",
 162              act->handler, act->count, act->arg);
 163 #endif
 164         act->handler (act->arg);
 165         act->count++;
 166
 167         intc->iar = mask << irqs;
 168
 169 #ifdef DEBUG_INT
 170         printf ("Dump INTC reg, isr %x, ier %x, iar %x, mer %x\n", intc->isr,
 171                 intc->ier, intc->iar, intc->mer);
 172         R14(value);
 173         printf ("Interrupt handler on %x line, r14 %x\n", irqs, value);
 174 #endif
 175 }
 176
 177 #if defined(CONFIG_CMD_IRQ)
 178 int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, const char *argv[])
 179 {
 180         int i;
 181         struct irq_action *act = vecs;
 182
 183         if (irq_no) {
 184                 puts("\nInterrupt-Information:\n\n"
 185                       "Nr  Routine   Arg       Count\n"
 186                       "-----------------------------\n");
 187
 188                 for (i = 0; i < irq_no; i++) {
 189                         if (act->handler != (interrupt_handler_t *) def_hdlr) {
 190                                 printf("%02d  %08x  %08x  %d\n", i,
 191                                         (int)act->handler, (int)act->arg,
 192                                                                 act->count);
 193                         }
 194                         act++;
 195                 }
 196                 puts("\n");
 197         } else {
 198                 puts("Undefined interrupt controller\n");
 199         }
 200         return 0;
 201 }
 202 #endif