cpu/mcf52x2/interrupts.c

   1 /*
   2  * (C) Copyright 2003 Josef Baumgartner <josef.baumgartner@telex.de>
   3  *
   4  * (C) Copyright 2000-2004
   5  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   6  *
   7  * See file CREDITS for list of people who contributed to this
   8  * project.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License as
  12  * published by the Free Software Foundation; either version 2 of
  13  * the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  23  * MA 02111-1307 USA
  24  */
  25
  26 #include <common.h>
  27 #include <watchdog.h>
  28 #include <asm/processor.h>
  29
  30 #ifdef  CONFIG_M5271
  31 #include <asm/m5271.h>
  32 #include <asm/immap_5271.h>
  33 #endif
  34
  35 #ifdef  CONFIG_M5272
  36 #include <asm/m5272.h>
  37 #include <asm/immap_5272.h>
  38 #endif
  39
  40 #ifdef  CONFIG_M5282
  41 #include <asm/m5282.h>
  42 #include <asm/immap_5282.h>
  43 #endif
  44
  45 #ifdef  CONFIG_M5249
  46 #include <asm/m5249.h>
  47 #endif
  48
  49
  50 #define NR_IRQS         31
  51
  52 /*
  53  * Interrupt vector functions.
  54  */
  55 struct interrupt_action {
  56         interrupt_handler_t *handler;
  57         void *arg;
  58 };
  59
  60 static struct interrupt_action irq_vecs[NR_IRQS];
  61
  62 static __inline__ unsigned short get_sr (void)
  63 {
  64         unsigned short sr;
  65
  66         asm volatile ("move.w %%sr,%0":"=r" (sr):);
  67
  68         return sr;
  69 }
  70
  71 static __inline__ void set_sr (unsigned short sr)
  72 {
  73         asm volatile ("move.w %0,%%sr"::"r" (sr));
  74 }
  75
  76 /************************************************************************/
  77 /*
  78  * Install and free an interrupt handler
  79  */
  80 void irq_install_handler (int vec, interrupt_handler_t * handler, void *arg)
  81 {
  82 #ifdef  CONFIG_M5272
  83         volatile intctrl_t *intp = (intctrl_t *) (CFG_MBAR + MCFSIM_ICR1);
  84 #endif
  85         int vec_base = 0;
  86
  87 #ifdef  CONFIG_M5272
  88         vec_base = intp->int_pivr & 0xe0;
  89 #endif
  90
  91         if ((vec < vec_base) || (vec > vec_base + NR_IRQS)) {
  92                 printf ("irq_install_handler: wrong interrupt vector %d\n",
  93                         vec);
  94                 return;
  95         }
  96
  97         irq_vecs[vec - vec_base].handler = handler;
  98         irq_vecs[vec - vec_base].arg = arg;
  99 }
 100
 101 void irq_free_handler (int vec)
 102 {
 103 #ifdef  CONFIG_M5272
 104         volatile intctrl_t *intp = (intctrl_t *) (CFG_MBAR + MCFSIM_ICR1);
 105 #endif
 106         int vec_base = 0;
 107
 108 #ifdef  CONFIG_M5272
 109         vec_base = intp->int_pivr & 0xe0;
 110 #endif
 111
 112         if ((vec < vec_base) || (vec > vec_base + NR_IRQS)) {
 113                 return;
 114         }
 115
 116         irq_vecs[vec - vec_base].handler = NULL;
 117         irq_vecs[vec - vec_base].arg = NULL;
 118 }
 119
 120 void enable_interrupts (void)
 121 {
 122         unsigned short sr;
 123
 124         sr = get_sr ();
 125         set_sr (sr & ~0x0700);
 126 }
 127
 128 int disable_interrupts (void)
 129 {
 130         unsigned short sr;
 131
 132         sr = get_sr ();
 133         set_sr (sr | 0x0700);
 134
 135         return ((sr & 0x0700) == 0);    /* return TRUE, if interrupts were enabled before */
 136 }
 137
 138 void int_handler (struct pt_regs *fp)
 139 {
 140 #ifdef  CONFIG_M5272
 141         volatile intctrl_t *intp = (intctrl_t *) (CFG_MBAR + MCFSIM_ICR1);
 142 #endif
 143         int vec, vec_base = 0;
 144
 145         vec = (fp->vector >> 2) & 0xff;
 146 #ifdef  CONFIG_M5272
 147         vec_base = intp->int_pivr & 0xe0;
 148 #endif
 149
 150         if (irq_vecs[vec - vec_base].handler != NULL) {
 151                 irq_vecs[vec -
 152                          vec_base].handler (irq_vecs[vec - vec_base].arg);
 153         } else {
 154                 printf ("\nBogus External Interrupt Vector %d\n", vec);
 155         }
 156 }
 157
 158
 159 #ifdef  CONFIG_M5272
 160 int interrupt_init (void)
 161 {
 162         volatile intctrl_t *intp = (intctrl_t *) (CFG_MBAR + MCFSIM_ICR1);
 163
 164         /* disable all external interrupts */
 165         intp->int_icr1 = 0x88888888;
 166         intp->int_icr2 = 0x88888888;
 167         intp->int_icr3 = 0x88888888;
 168         intp->int_icr4 = 0x88888888;
 169         intp->int_pitr = 0x00000000;
 170         /* initialize vector register */
 171         intp->int_pivr = 0x40;
 172
 173         enable_interrupts ();
 174
 175         return 0;
 176 }
 177 #endif
 178
 179 #if defined(CONFIG_M5282) || defined(CONFIG_M5271)
 180 int interrupt_init (void)
 181 {
 182         return 0;
 183 }
 184 #endif
 185
 186 #ifdef  CONFIG_M5249
 187 int interrupt_init (void)
 188 {
 189         enable_interrupts ();
 190
 191         return 0;
 192 }
 193 #endif