cpu/arm926ejs/interrupts.c

   1 /*
   2  * (C) Copyright 2003
   3  * Texas Instruments <www.ti.com>
   4  *
   5  * (C) Copyright 2002
   6  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   7  * Marius Groeger <mgroeger@sysgo.de>
   8  *
   9  * (C) Copyright 2002
  10  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
  11  * Alex Zuepke <azu@sysgo.de>
  12  *
  13  * (C) Copyright 2002-2004
  14  * Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
  15  *
  16  * (C) Copyright 2004
  17  * Philippe Robin, ARM Ltd. <philippe.robin@arm.com>
  18  *
  19  * See file CREDITS for list of people who contributed to this
  20  * project.
  21  *
  22  * This program is free software; you can redistribute it and/or
  23  * modify it under the terms of the GNU General Public License as
  24  * published by the Free Software Foundation; either version 2 of
  25  * the License, or (at your option) any later version.
  26  *
  27  * This program is distributed in the hope that it will be useful,
  28  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  29  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  30  * GNU General Public License for more details.
  31  *
  32  * You should have received a copy of the GNU General Public License
  33  * along with this program; if not, write to the Free Software
  34  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  35  * MA 02111-1307 USA
  36  */
  37
  38 #include <common.h>
  39 #include <arm926ejs.h>
  40 #include <asm/proc-armv/ptrace.h>
  41
  42 #ifdef CONFIG_USE_IRQ
  43 /* enable IRQ interrupts */
  44 void enable_interrupts (void)
  45 {
  46         unsigned long temp;
  47         __asm__ __volatile__("mrs %0, cpsr\n"
  48                              "bic %0, %0, #0x80\n"
  49                              "msr cpsr_c, %0"
  50                              : "=r" (temp)
  51                              :
  52                              : "memory");
  53 }
  54
  55
  56 /*
  57  * disable IRQ/FIQ interrupts
  58  * returns true if interrupts had been enabled before we disabled them
  59  */
  60 int disable_interrupts (void)
  61 {
  62         unsigned long old,temp;
  63         __asm__ __volatile__("mrs %0, cpsr\n"
  64                              "orr %1, %0, #0xc0\n"
  65                              "msr cpsr_c, %1"
  66                              : "=r" (old), "=r" (temp)
  67                              :
  68                              : "memory");
  69         return (old & 0x80) == 0;
  70 }
  71 #else
  72 void enable_interrupts (void)
  73 {
  74         return;
  75 }
  76 int disable_interrupts (void)
  77 {
  78         return 0;
  79 }
  80 #endif
  81
  82
  83 void bad_mode (void)
  84 {
  85         panic ("Resetting CPU ...\n");
  86         reset_cpu (0);
  87 }
  88
  89 void show_regs (struct pt_regs *regs)
  90 {
  91         unsigned long flags;
  92         const char *processor_modes[] = {
  93         "USER_26",      "FIQ_26",       "IRQ_26",       "SVC_26",
  94         "UK4_26",       "UK5_26",       "UK6_26",       "UK7_26",
  95         "UK8_26",       "UK9_26",       "UK10_26",      "UK11_26",
  96         "UK12_26",      "UK13_26",      "UK14_26",      "UK15_26",
  97         "USER_32",      "FIQ_32",       "IRQ_32",       "SVC_32",
  98         "UK4_32",       "UK5_32",       "UK6_32",       "ABT_32",
  99         "UK8_32",       "UK9_32",       "UK10_32",      "UND_32",
 100         "UK12_32",      "UK13_32",      "UK14_32",      "SYS_32",
 101         };
 102
 103         flags = condition_codes (regs);
 104
 105         printf ("pc : [<%08lx>]    lr : [<%08lx>]\n"
 106                 "sp : %08lx  ip : %08lx  fp : %08lx\n",
 107                 instruction_pointer (regs),
 108                 regs->ARM_lr, regs->ARM_sp, regs->ARM_ip, regs->ARM_fp);
 109         printf ("r10: %08lx  r9 : %08lx  r8 : %08lx\n",
 110                 regs->ARM_r10, regs->ARM_r9, regs->ARM_r8);
 111         printf ("r7 : %08lx  r6 : %08lx  r5 : %08lx  r4 : %08lx\n",
 112                 regs->ARM_r7, regs->ARM_r6, regs->ARM_r5, regs->ARM_r4);
 113         printf ("r3 : %08lx  r2 : %08lx  r1 : %08lx  r0 : %08lx\n",
 114                 regs->ARM_r3, regs->ARM_r2, regs->ARM_r1, regs->ARM_r0);
 115         printf ("Flags: %c%c%c%c",
 116                 flags & CC_N_BIT ? 'N' : 'n',
 117                 flags & CC_Z_BIT ? 'Z' : 'z',
 118                 flags & CC_C_BIT ? 'C' : 'c', flags & CC_V_BIT ? 'V' : 'v');
 119         printf ("  IRQs %s  FIQs %s  Mode %s%s\n",
 120                 interrupts_enabled (regs) ? "on" : "off",
 121                 fast_interrupts_enabled (regs) ? "on" : "off",
 122                 processor_modes[processor_mode (regs)],
 123                 thumb_mode (regs) ? " (T)" : "");
 124 }
 125
 126 void do_undefined_instruction (struct pt_regs *pt_regs)
 127 {
 128         printf ("undefined instruction\n");
 129         show_regs (pt_regs);
 130         bad_mode ();
 131 }
 132
 133 void do_software_interrupt (struct pt_regs *pt_regs)
 134 {
 135         printf ("software interrupt\n");
 136         show_regs (pt_regs);
 137         bad_mode ();
 138 }
 139
 140 void do_prefetch_abort (struct pt_regs *pt_regs)
 141 {
 142         printf ("prefetch abort\n");
 143         show_regs (pt_regs);
 144         bad_mode ();
 145 }
 146
 147 void do_data_abort (struct pt_regs *pt_regs)
 148 {
 149         printf ("data abort\n");
 150         show_regs (pt_regs);
 151         bad_mode ();
 152 }
 153
 154 void do_not_used (struct pt_regs *pt_regs)
 155 {
 156         printf ("not used\n");
 157         show_regs (pt_regs);
 158         bad_mode ();
 159 }
 160
 161 void do_fiq (struct pt_regs *pt_regs)
 162 {
 163         printf ("fast interrupt request\n");
 164         show_regs (pt_regs);
 165         bad_mode ();
 166 }
 167
 168 void do_irq (struct pt_regs *pt_regs)
 169 {
 170         printf ("interrupt request\n");
 171         show_regs (pt_regs);
 172         bad_mode ();
 173 }
 174
 175 #ifdef CONFIG_INTEGRATOR
 176
 177         /* Timer functionality supplied by Integrator board (AP or CP) */
 178
 179 #else
 180
 181 /* nothing really to do with interrupts, just starts up a counter. */
 182 int interrupt_init (void)
 183 {
 184         extern void timer_init(void);
 185
 186         timer_init();
 187
 188         return 0;
 189 }
 190
 191 #endif /* CONFIG_INTEGRATOR */