cpu/microblaze/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 CFG_INTC_0
  49 #ifdef CFG_TIMER_0
  50 extern void timer_init (void);
  51 #endif
  52 #ifdef CFG_FSL_2
  53 extern void fsl_init2 (void);
  54 #endif
  55
  56
  57 static struct irq_action vecs[CFG_INTC_0_NUM];
  58
  59 /* mapping structure to interrupt controller */
  60 microblaze_intc_t *intc = (microblaze_intc_t *) (CFG_INTC_0_ADDR);
  61
  62 /* default handler */
  63 void def_hdlr (void)
  64 {
  65         puts ("def_hdlr\n");
  66 }
  67
  68 void enable_one_interrupt (int irq)
  69 {
  70         int mask;
  71         int offset = 1;
  72         offset <<= irq;
  73         mask = intc->ier;
  74         intc->ier = (mask | offset);
  75 #ifdef DEBUG_INT
  76         printf ("Enable one interrupt irq %x - mask %x,ier %x\n", offset, mask,
  77                 intc->ier);
  78         printf ("INTC isr %x, ier %x, iar %x, mer %x\n", intc->isr, intc->ier,
  79                 intc->iar, intc->mer);
  80 #endif
  81 }
  82
  83 void disable_one_interrupt (int irq)
  84 {
  85         int mask;
  86         int offset = 1;
  87         offset <<= irq;
  88         mask = intc->ier;
  89         intc->ier = (mask & ~offset);
  90 #ifdef DEBUG_INT
  91         printf ("Disable one interrupt irq %x - mask %x,ier %x\n", irq, mask,
  92                 intc->ier);
  93         printf ("INTC isr %x, ier %x, iar %x, mer %x\n", intc->isr, intc->ier,
  94                 intc->iar, intc->mer);
  95 #endif
  96 }
  97
  98 /* adding new handler for interrupt */
  99 void install_interrupt_handler (int irq, interrupt_handler_t * hdlr, void *arg)
 100 {
 101         struct irq_action *act;
 102         /* irq out of range */
 103         if ((irq < 0) || (irq > CFG_INTC_0_NUM)) {
 104                 puts ("IRQ out of range\n");
 105                 return;
 106         }
 107         act = &vecs[irq];
 108         if (hdlr) {             /* enable */
 109                 act->handler = hdlr;
 110                 act->arg = arg;
 111                 act->count = 0;
 112                 enable_one_interrupt (irq);
 113         } else {                /* disable */
 114                 act->handler = (interrupt_handler_t *) def_hdlr;
 115                 act->arg = (void *)irq;
 116                 disable_one_interrupt (irq);
 117         }
 118 }
 119
 120 /* initialization interrupt controller - hardware */
 121 void intc_init (void)
 122 {
 123         intc->mer = 0;
 124         intc->ier = 0;
 125         intc->iar = 0xFFFFFFFF;
 126         /* XIntc_Start - hw_interrupt enable and all interrupt enable */
 127         intc->mer = 0x3;
 128 #ifdef DEBUG_INT
 129         printf ("INTC isr %x, ier %x, iar %x, mer %x\n", intc->isr, intc->ier,
 130                 intc->iar, intc->mer);
 131 #endif
 132 }
 133
 134 int interrupts_init (void)
 135 {
 136         int i;
 137         /* initialize irq list */
 138         for (i = 0; i < CFG_INTC_0_NUM; i++) {
 139                 vecs[i].handler = (interrupt_handler_t *) def_hdlr;
 140                 vecs[i].arg = (void *)i;
 141                 vecs[i].count = 0;
 142         }
 143         /* initialize intc controller */
 144         intc_init ();
 145 #ifdef CFG_TIMER_0
 146         timer_init ();
 147 #endif
 148 #ifdef CFG_FSL_2
 149         fsl_init2 ();
 150 #endif
 151         enable_interrupts ();
 152         return 0;
 153 }
 154
 155 void interrupt_handler (void)
 156 {
 157         int irqs = (intc->isr & intc->ier);     /* find active interrupt */
 158         int i = 1;
 159 #ifdef DEBUG_INT
 160         int value;
 161         printf ("INTC isr %x, ier %x, iar %x, mer %x\n", intc->isr, intc->ier,
 162                 intc->iar, intc->mer);
 163         R14(value);
 164         printf ("Interrupt handler on %x line, r14 %x\n", irqs, value);
 165 #endif
 166         struct irq_action *act = vecs;
 167         while (irqs) {
 168                 if (irqs & 1) {
 169 #ifdef DEBUG_INT
 170                         printf
 171                             ("Jumping to interrupt handler rutine addr %x,count %x,arg %x\n",
 172                              act->handler, act->count, act->arg);
 173 #endif
 174                         act->handler (act->arg);
 175                         act->count++;
 176                         intc->iar = i;
 177                         return;
 178                 }
 179                 irqs >>= 1;
 180                 act++;
 181                 i <<= 1;
 182         }
 183
 184 #ifdef DEBUG_INT
 185         printf ("Dump INTC reg, isr %x, ier %x, iar %x, mer %x\n", intc->isr,
 186                 intc->ier, intc->iar, intc->mer);
 187         R14(value);
 188         printf ("Interrupt handler on %x line, r14 %x\n", irqs, value);
 189 #endif
 190 }
 191 #endif
 192
 193 #if defined(CONFIG_CMD_IRQ)
 194 #ifdef CFG_INTC_0
 195 int do_irqinfo (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 196 {
 197         int i;
 198         struct irq_action *act = vecs;
 199
 200         puts ("\nInterrupt-Information:\n\n"
 201               "Nr  Routine   Arg       Count\n"
 202               "-----------------------------\n");
 203
 204         for (i = 0; i < CFG_INTC_0_NUM; i++) {
 205                 if (act->handler != (interrupt_handler_t*) def_hdlr) {
 206                         printf ("%02d  %08lx  %08lx  %d\n", i,
 207                                 (int)act->handler, (int)act->arg, act->count);
 208                 }
 209                 act++;
 210         }
 211         puts ("\n");
 212         return (0);
 213 }
 214 #else
 215 int do_irqinfo (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 216 {
 217         puts ("Undefined interrupt controller\n");
 218 }
 219 #endif
 220 #endif