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