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  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 #include <common.h>
  28 #include <command.h>
  29 #include <asm/microblaze_intc.h>
  30 #include <asm/asm.h>
  31
  32 #undef DEBUG_INT
  33
  34 extern void microblaze_disable_interrupts (void);
  35 extern void microblaze_enable_interrupts (void);
  36
  37 void enable_interrupts (void)
  38 {
  39         MSRSET(0x2);
  40 }
  41
  42 int disable_interrupts (void)
  43 {
  44         MSRCLR(0x2);
  45         return 0;
  46 }
  47
  48 #ifdef CONFIG_SYS_INTC_0
  49
  50 static struct irq_action vecs[CONFIG_SYS_INTC_0_NUM];
  51
  52 /* mapping structure to interrupt controller */
  53 microblaze_intc_t *intc = (microblaze_intc_t *) (CONFIG_SYS_INTC_0_ADDR);
  54
  55 /* default handler */
  56 void def_hdlr (void)
  57 {
  58         puts ("def_hdlr\n");
  59 }
  60
  61 void enable_one_interrupt (int irq)
  62 {
  63         int mask;
  64         int offset = 1;
  65         offset <<= irq;
  66         mask = intc->ier;
  67         intc->ier = (mask | offset);
  68 #ifdef DEBUG_INT
  69         printf ("Enable one interrupt irq %x - mask %x,ier %x\n", offset, mask,
  70                 intc->ier);
  71         printf ("INTC isr %x, ier %x, iar %x, mer %x\n", intc->isr, intc->ier,
  72                 intc->iar, intc->mer);
  73 #endif
  74 }
  75
  76 void disable_one_interrupt (int irq)
  77 {
  78         int mask;
  79         int offset = 1;
  80         offset <<= irq;
  81         mask = intc->ier;
  82         intc->ier = (mask & ~offset);
  83 #ifdef DEBUG_INT
  84         printf ("Disable one interrupt irq %x - mask %x,ier %x\n", irq, mask,
  85                 intc->ier);
  86         printf ("INTC isr %x, ier %x, iar %x, mer %x\n", intc->isr, intc->ier,
  87                 intc->iar, intc->mer);
  88 #endif
  89 }
  90
  91 /* adding new handler for interrupt */
  92 void install_interrupt_handler (int irq, interrupt_handler_t * hdlr, void *arg)
  93 {
  94         struct irq_action *act;
  95         /* irq out of range */
  96         if ((irq < 0) || (irq > CONFIG_SYS_INTC_0_NUM)) {
  97                 puts ("IRQ out of range\n");
  98                 return;
  99         }
 100         act = &vecs[irq];
 101         if (hdlr) {             /* enable */
 102                 act->handler = hdlr;
 103                 act->arg = arg;
 104                 act->count = 0;
 105                 enable_one_interrupt (irq);
 106         } else {                /* disable */
 107                 act->handler = (interrupt_handler_t *) def_hdlr;
 108                 act->arg = (void *)irq;
 109                 disable_one_interrupt (irq);
 110         }
 111 }
 112
 113 /* initialization interrupt controller - hardware */
 114 void intc_init (void)
 115 {
 116         intc->mer = 0;
 117         intc->ier = 0;
 118         intc->iar = 0xFFFFFFFF;
 119         /* XIntc_Start - hw_interrupt enable and all interrupt enable */
 120         intc->mer = 0x3;
 121 #ifdef DEBUG_INT
 122         printf ("INTC isr %x, ier %x, iar %x, mer %x\n", intc->isr, intc->ier,
 123                 intc->iar, intc->mer);
 124 #endif
 125 }
 126
 127 int interrupts_init (void)
 128 {
 129         int i;
 130         /* initialize irq list */
 131         for (i = 0; i < CONFIG_SYS_INTC_0_NUM; i++) {
 132                 vecs[i].handler = (interrupt_handler_t *) def_hdlr;
 133                 vecs[i].arg = (void *)i;
 134                 vecs[i].count = 0;
 135         }
 136         /* initialize intc controller */
 137         intc_init ();
 138         enable_interrupts ();
 139         return 0;
 140 }
 141
 142 void interrupt_handler (void)
 143 {
 144         int irqs = intc->ivr;   /* find active interrupt */
 145         int mask = 1;
 146 #ifdef DEBUG_INT
 147         int value;
 148         printf ("INTC isr %x, ier %x, iar %x, mer %x\n", intc->isr, intc->ier,
 149                 intc->iar, intc->mer);
 150         R14(value);
 151         printf ("Interrupt handler on %x line, r14 %x\n", irqs, value);
 152 #endif
 153         struct irq_action *act = vecs + irqs;
 154
 155         intc->iar = mask << irqs;
 156
 157 #ifdef DEBUG_INT
 158         printf
 159             ("Jumping to interrupt handler rutine addr %x,count %x,arg %x\n",
 160              act->handler, act->count, act->arg);
 161 #endif
 162         act->handler (act->arg);
 163         act->count++;
 164
 165 #ifdef DEBUG_INT
 166         printf ("Dump INTC reg, isr %x, ier %x, iar %x, mer %x\n", intc->isr,
 167                 intc->ier, intc->iar, intc->mer);
 168         R14(value);
 169         printf ("Interrupt handler on %x line, r14 %x\n", irqs, value);
 170 #endif
 171 }
 172 #endif
 173
 174 #if defined(CONFIG_CMD_IRQ)
 175 #ifdef CONFIG_SYS_INTC_0
 176 int do_irqinfo (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 177 {
 178         int i;
 179         struct irq_action *act = vecs;
 180
 181         puts ("\nInterrupt-Information:\n\n"
 182               "Nr  Routine   Arg       Count\n"
 183               "-----------------------------\n");
 184
 185         for (i = 0; i < CONFIG_SYS_INTC_0_NUM; i++) {
 186                 if (act->handler != (interrupt_handler_t*) def_hdlr) {
 187                         printf ("%02d  %08x  %08x  %d\n", i,
 188                                 (int)act->handler, (int)act->arg, act->count);
 189                 }
 190                 act++;
 191         }
 192         puts ("\n");
 193         return (0);
 194 }
 195 #else
 196 int do_irqinfo (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 197 {
 198         puts ("Undefined interrupt controller\n");
 199 }
 200 #endif
 201 #endif