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 <malloc.h>
  30 #include <asm/microblaze_intc.h>
  31 #include <asm/asm.h>
  32
  33 #undef DEBUG_INT
  34
  35 void enable_interrupts(void)
  36 {
  37         MSRSET(0x2);
  38 }
  39
  40 int disable_interrupts(void)
  41 {
  42         unsigned int msr;
  43
  44         MFS(msr, rmsr);
  45         MSRCLR(0x2);
  46         return (msr & 0x2) != 0;
  47 }
  48
  49 static struct irq_action *vecs;
  50 static u32 irq_no;
  51
  52 /* mapping structure to interrupt controller */
  53 microblaze_intc_t *intc;
  54
  55 /* default handler */
  56 static void def_hdlr(void)
  57 {
  58         puts("def_hdlr\n");
  59 }
  60
  61 static void enable_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("Enable one interrupt irq %x - mask %x,ier %x\n", offset, 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 static void disable_one_interrupt(int irq)
  78 {
  79         int mask;
  80         int offset = 1;
  81
  82         offset <<= irq;
  83         mask = intc->ier;
  84         intc->ier = (mask & ~offset);
  85 #ifdef DEBUG_INT
  86         printf("Disable one interrupt irq %x - mask %x,ier %x\n", irq, mask,
  87                 intc->ier);
  88         printf("INTC isr %x, ier %x, iar %x, mer %x\n", intc->isr, intc->ier,
  89                 intc->iar, intc->mer);
  90 #endif
  91 }
  92
  93 int install_interrupt_handler(int irq, interrupt_handler_t *hdlr, void *arg)
  94 {
  95         struct irq_action *act;
  96
  97         /* irq out of range */
  98         if ((irq < 0) || (irq > irq_no)) {
  99                 puts("IRQ out of range\n");
 100                 return -1;
 101         }
 102         act = &vecs[irq];
 103         if (hdlr) {             /* enable */
 104                 act->handler = hdlr;
 105                 act->arg = arg;
 106                 act->count = 0;
 107                 enable_one_interrupt (irq);
 108                 return 0;
 109         }
 110
 111         /* Disable */
 112         act->handler = (interrupt_handler_t *) def_hdlr;
 113         act->arg = (void *)irq;
 114         disable_one_interrupt(irq);
 115         return 1;
 116 }
 117
 118 /* initialization interrupt controller - hardware */
 119 static void intc_init(void)
 120 {
 121         intc->mer = 0;
 122         intc->ier = 0;
 123         intc->iar = 0xFFFFFFFF;
 124         /* XIntc_Start - hw_interrupt enable and all interrupt enable */
 125         intc->mer = 0x3;
 126 #ifdef DEBUG_INT
 127         printf("INTC isr %x, ier %x, iar %x, mer %x\n", intc->isr, intc->ier,
 128                 intc->iar, intc->mer);
 129 #endif
 130 }
 131
 132 int interrupts_init(void)
 133 {
 134         int i;
 135
 136 #if defined(CONFIG_SYS_INTC_0_ADDR) && defined(CONFIG_SYS_INTC_0_NUM)
 137         intc = (microblaze_intc_t *) (CONFIG_SYS_INTC_0_ADDR);
 138         irq_no = CONFIG_SYS_INTC_0_NUM;
 139 #endif
 140         if (irq_no) {
 141                 vecs = calloc(1, sizeof(struct irq_action) * irq_no);
 142                 if (vecs == NULL) {
 143                         puts("Interrupt vector allocation failed\n");
 144                         return -1;
 145                 }
 146
 147                 /* initialize irq list */
 148                 for (i = 0; i < irq_no; i++) {
 149                         vecs[i].handler = (interrupt_handler_t *) def_hdlr;
 150                         vecs[i].arg = (void *)i;
 151                         vecs[i].count = 0;
 152                 }
 153                 /* initialize intc controller */
 154                 intc_init();
 155                 enable_interrupts();
 156         } else {
 157                 puts("Undefined interrupt controller\n");
 158         }
 159         return 0;
 160 }
 161
 162 void interrupt_handler(void)
 163 {
 164         int irqs = intc->ivr;   /* find active interrupt */
 165         int mask = 1;
 166 #ifdef DEBUG_INT
 167         int value;
 168         printf ("INTC isr %x, ier %x, iar %x, mer %x\n", intc->isr, intc->ier,
 169                 intc->iar, intc->mer);
 170         R14(value);
 171         printf ("Interrupt handler on %x line, r14 %x\n", irqs, value);
 172 #endif
 173         struct irq_action *act = vecs + irqs;
 174
 175 #ifdef DEBUG_INT
 176         printf
 177             ("Jumping to interrupt handler rutine addr %x,count %x,arg %x\n",
 178              act->handler, act->count, act->arg);
 179 #endif
 180         act->handler (act->arg);
 181         act->count++;
 182
 183         intc->iar = mask << irqs;
 184
 185 #ifdef DEBUG_INT
 186         printf ("Dump INTC reg, isr %x, ier %x, iar %x, mer %x\n", intc->isr,
 187                 intc->ier, intc->iar, intc->mer);
 188         R14(value);
 189         printf ("Interrupt handler on %x line, r14 %x\n", irqs, value);
 190 #endif
 191 }
 192
 193 #if defined(CONFIG_CMD_IRQ)
 194 int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, const char *argv[])
 195 {
 196         int i;
 197         struct irq_action *act = vecs;
 198
 199         if (irq_no) {
 200                 puts("\nInterrupt-Information:\n\n"
 201                       "Nr  Routine   Arg       Count\n"
 202                       "-----------------------------\n");
 203
 204                 for (i = 0; i < irq_no; i++) {
 205                         if (act->handler != (interrupt_handler_t *) def_hdlr) {
 206                                 printf("%02d  %08x  %08x  %d\n", i,
 207                                         (int)act->handler, (int)act->arg,
 208                                                                 act->count);
 209                         }
 210                         act++;
 211                 }
 212                 puts("\n");
 213         } else {
 214                 puts("Undefined interrupt controller\n");
 215         }
 216         return 0;
 217 }
 218 #endif