arch/blackfin/mach-common/interrupt.S

   1 /*
   2  * File:         arch/blackfin/mach-common/interrupt.S
   3  * Based on:
   4  * Author:       D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>
   5  *               Kenneth Albanowski <kjahds@kjahds.com>
   6  *
   7  * Created:      ?
   8  * Description:  Interrupt Entries
   9  *
  10  * Modified:
  11  *               Copyright 2004-2006 Analog Devices Inc.
  12  *
  13  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  14  *
  15  * This program is free software; you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2 of the License, or
  18  * (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, see the file COPYING, or write
  27  * to the Free Software Foundation, Inc.,
  28  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  29  */
  30
  31 #include <asm/blackfin.h>
  32 #include <asm/mach/irq.h>
  33 #include <linux/linkage.h>
  34 #include <asm/entry.h>
  35 #include <asm/asm-offsets.h>
  36 #include <asm/trace.h>
  37 #include <asm/traps.h>
  38 #include <asm/thread_info.h>
  39
  40 #include <asm/mach-common/context.S>
  41
  42 .extern _ret_from_exception
  43
  44 #ifdef CONFIG_I_ENTRY_L1
  45 .section .l1.text
  46 #else
  47 .text
  48 #endif
  49
  50 .align 4        /* just in case */
  51
  52 /* Common interrupt entry code.  First we do CLI, then push
  53  * RETI, to keep interrupts disabled, but to allow this state to be changed
  54  * by local_bh_enable.
  55  * R0 contains the interrupt number, while R1 may contain the value of IPEND,
  56  * or garbage if IPEND won't be needed by the ISR.  */
  57 __common_int_entry:
  58         [--sp] = fp;
  59         [--sp] = usp;
  60
  61         [--sp] = i0;
  62         [--sp] = i1;
  63         [--sp] = i2;
  64         [--sp] = i3;
  65
  66         [--sp] = m0;
  67         [--sp] = m1;
  68         [--sp] = m2;
  69         [--sp] = m3;
  70
  71         [--sp] = l0;
  72         [--sp] = l1;
  73         [--sp] = l2;
  74         [--sp] = l3;
  75
  76         [--sp] = b0;
  77         [--sp] = b1;
  78         [--sp] = b2;
  79         [--sp] = b3;
  80         [--sp] = a0.x;
  81         [--sp] = a0.w;
  82         [--sp] = a1.x;
  83         [--sp] = a1.w;
  84
  85         [--sp] = LC0;
  86         [--sp] = LC1;
  87         [--sp] = LT0;
  88         [--sp] = LT1;
  89         [--sp] = LB0;
  90         [--sp] = LB1;
  91
  92         [--sp] = ASTAT;
  93
  94         [--sp] = r0;    /* Skip reserved */
  95         [--sp] = RETS;
  96         r2 = RETI;
  97         [--sp] = r2;
  98         [--sp] = RETX;
  99         [--sp] = RETN;
 100         [--sp] = RETE;
 101         [--sp] = SEQSTAT;
 102         [--sp] = r1;    /* IPEND - R1 may or may not be set up before jumping here. */
 103
 104         /* Switch to other method of keeping interrupts disabled.  */
 105 #ifdef CONFIG_DEBUG_HWERR
 106         r1 = 0x3f;
 107         sti r1;
 108 #else
 109         cli r1;
 110 #endif
 111         [--sp] = RETI;  /* orig_pc */
 112         /* Clear all L registers.  */
 113         r1 = 0 (x);
 114         l0 = r1;
 115         l1 = r1;
 116         l2 = r1;
 117         l3 = r1;
 118 #ifdef CONFIG_FRAME_POINTER
 119         fp = 0;
 120 #endif
 121
 122 #if ANOMALY_05000283 || ANOMALY_05000315
 123         cc = r7 == r7;
 124         p5.h = HI(CHIPID);
 125         p5.l = LO(CHIPID);
 126         if cc jump 1f;
 127         r7.l = W[p5];
 128 1:
 129 #endif
 130         r1 =  sp;
 131         SP += -12;
 132         call _do_irq;
 133         SP += 12;
 134         call _return_from_int;
 135 .Lcommon_restore_context:
 136         RESTORE_CONTEXT
 137         rti;
 138
 139 /* interrupt routine for ivhw - 5 */
 140 ENTRY(_evt_ivhw)
 141         SAVE_ALL_SYS
 142 #ifdef CONFIG_FRAME_POINTER
 143         fp = 0;
 144 #endif
 145
 146 #if ANOMALY_05000283
 147         cc = r7 == r7;
 148         p5.h = HI(CHIPID);
 149         p5.l = LO(CHIPID);
 150         if cc jump 1f;
 151         r7.l = W[p5];
 152 1:
 153 #endif
 154
 155 #ifdef CONFIG_HARDWARE_PM
 156         r7 = [sp + PT_SEQSTAT];
 157         r7 = r7 >>> 0xe;
 158         r6 = 0x1F;
 159         r7 = r7 & r6;
 160         r5 = 0x12;
 161         cc = r7 == r5;
 162         if cc jump .Lcall_do_ovf; /* deal with performance counter overflow */
 163 #endif
 164         # We are going to dump something out, so make sure we print IPEND properly
 165         p2.l = lo(IPEND);
 166         p2.h = hi(IPEND);
 167         r0 = [p2];
 168         [sp + PT_IPEND] = r0;
 169
 170         /* set the EXCAUSE to HWERR for trap_c */
 171         r0 = [sp + PT_SEQSTAT];
 172         R1.L = LO(VEC_HWERR);
 173         R1.H = HI(VEC_HWERR);
 174         R0 = R0 | R1;
 175         [sp + PT_SEQSTAT] = R0;
 176
 177         r0 = sp;        /* stack frame pt_regs pointer argument ==> r0 */
 178         SP += -12;
 179         call _trap_c;
 180         SP += 12;
 181
 182         call _ret_from_exception;
 183 .Lcommon_restore_all_sys:
 184         RESTORE_ALL_SYS
 185         rti;
 186
 187 #ifdef CONFIG_HARDWARE_PM
 188 .Lcall_do_ovf:
 189
 190         SP += -12;
 191         call _pm_overflow;
 192         SP += 12;
 193
 194         jump .Lcommon_restore_all_sys;
 195 #endif
 196
 197 ENDPROC(_evt_ivhw)
 198
 199 /* Interrupt routine for evt2 (NMI).
 200  * We don't actually use this, so just return.
 201  * For inner circle type details, please see:
 202  * http://docs.blackfin.uclinux.org/doku.php?id=linux:nmi
 203  */
 204 ENTRY(_evt_nmi)
 205 .weak _evt_nmi
 206         rtn;
 207 ENDPROC(_evt_nmi)
 208
 209 /* interrupt routine for core timer - 6 */
 210 ENTRY(_evt_timer)
 211         TIMER_INTERRUPT_ENTRY(EVT_IVTMR_P)
 212
 213 /* interrupt routine for evt7 - 7 */
 214 ENTRY(_evt_evt7)
 215         INTERRUPT_ENTRY(EVT_IVG7_P)
 216 ENTRY(_evt_evt8)
 217         INTERRUPT_ENTRY(EVT_IVG8_P)
 218 ENTRY(_evt_evt9)
 219         INTERRUPT_ENTRY(EVT_IVG9_P)
 220 ENTRY(_evt_evt10)
 221         INTERRUPT_ENTRY(EVT_IVG10_P)
 222 ENTRY(_evt_evt11)
 223         INTERRUPT_ENTRY(EVT_IVG11_P)
 224 ENTRY(_evt_evt12)
 225         INTERRUPT_ENTRY(EVT_IVG12_P)
 226 ENTRY(_evt_evt13)
 227         INTERRUPT_ENTRY(EVT_IVG13_P)
 228
 229
 230  /* interrupt routine for system_call - 15 */
 231 ENTRY(_evt_system_call)
 232         SAVE_CONTEXT_SYSCALL
 233 #ifdef CONFIG_FRAME_POINTER
 234         fp = 0;
 235 #endif
 236         call _system_call;
 237         jump .Lcommon_restore_context;
 238 ENDPROC(_evt_system_call)