| /* |
| * File: arch/blackfin/mach-common/interrupt.S |
| * Based on: |
| * Author: D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca> |
| * Kenneth Albanowski <kjahds@kjahds.com> |
| * |
| * Created: ? |
| * Description: Interrupt Entries |
| * |
| * Modified: |
| * Copyright 2004-2006 Analog Devices Inc. |
| * |
| * Bugs: Enter bugs at http://blackfin.uclinux.org/ |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, see the file COPYING, or write |
| * to the Free Software Foundation, Inc., |
| * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <asm/blackfin.h> |
| #include <mach/irq.h> |
| #include <linux/linkage.h> |
| #include <asm/entry.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/trace.h> |
| #include <asm/traps.h> |
| #include <asm/thread_info.h> |
| |
| #include <asm/context.S> |
| |
| .extern _ret_from_exception |
| |
| #ifdef CONFIG_I_ENTRY_L1 |
| .section .l1.text |
| #else |
| .text |
| #endif |
| |
| .align 4 /* just in case */ |
| |
| /* Common interrupt entry code. First we do CLI, then push |
| * RETI, to keep interrupts disabled, but to allow this state to be changed |
| * by local_bh_enable. |
| * R0 contains the interrupt number, while R1 may contain the value of IPEND, |
| * or garbage if IPEND won't be needed by the ISR. */ |
| __common_int_entry: |
| [--sp] = fp; |
| [--sp] = usp; |
| |
| [--sp] = i0; |
| [--sp] = i1; |
| [--sp] = i2; |
| [--sp] = i3; |
| |
| [--sp] = m0; |
| [--sp] = m1; |
| [--sp] = m2; |
| [--sp] = m3; |
| |
| [--sp] = l0; |
| [--sp] = l1; |
| [--sp] = l2; |
| [--sp] = l3; |
| |
| [--sp] = b0; |
| [--sp] = b1; |
| [--sp] = b2; |
| [--sp] = b3; |
| [--sp] = a0.x; |
| [--sp] = a0.w; |
| [--sp] = a1.x; |
| [--sp] = a1.w; |
| |
| [--sp] = LC0; |
| [--sp] = LC1; |
| [--sp] = LT0; |
| [--sp] = LT1; |
| [--sp] = LB0; |
| [--sp] = LB1; |
| |
| [--sp] = ASTAT; |
| |
| [--sp] = r0; /* Skip reserved */ |
| [--sp] = RETS; |
| r2 = RETI; |
| [--sp] = r2; |
| [--sp] = RETX; |
| [--sp] = RETN; |
| [--sp] = RETE; |
| [--sp] = SEQSTAT; |
| [--sp] = r1; /* IPEND - R1 may or may not be set up before jumping here. */ |
| |
| /* Switch to other method of keeping interrupts disabled. */ |
| #ifdef CONFIG_DEBUG_HWERR |
| r1 = 0x3f; |
| sti r1; |
| #else |
| cli r1; |
| #endif |
| [--sp] = RETI; /* orig_pc */ |
| /* Clear all L registers. */ |
| r1 = 0 (x); |
| l0 = r1; |
| l1 = r1; |
| l2 = r1; |
| l3 = r1; |
| #ifdef CONFIG_FRAME_POINTER |
| fp = 0; |
| #endif |
| |
| #if ANOMALY_05000283 || ANOMALY_05000315 |
| cc = r7 == r7; |
| p5.h = HI(CHIPID); |
| p5.l = LO(CHIPID); |
| if cc jump 1f; |
| r7.l = W[p5]; |
| 1: |
| #endif |
| r1 = sp; |
| SP += -12; |
| #ifdef CONFIG_IPIPE |
| call ___ipipe_grab_irq |
| SP += 12; |
| cc = r0 == 0; |
| if cc jump .Lcommon_restore_context; |
| #else /* CONFIG_IPIPE */ |
| call _do_irq; |
| SP += 12; |
| #endif /* CONFIG_IPIPE */ |
| call _return_from_int; |
| .Lcommon_restore_context: |
| RESTORE_CONTEXT |
| rti; |
| |
| /* interrupt routine for ivhw - 5 */ |
| ENTRY(_evt_ivhw) |
| SAVE_ALL_SYS |
| #ifdef CONFIG_FRAME_POINTER |
| fp = 0; |
| #endif |
| |
| #if ANOMALY_05000283 || ANOMALY_05000315 |
| cc = r7 == r7; |
| p5.h = HI(CHIPID); |
| p5.l = LO(CHIPID); |
| if cc jump 1f; |
| r7.l = W[p5]; |
| 1: |
| #endif |
| |
| # We are going to dump something out, so make sure we print IPEND properly |
| p2.l = lo(IPEND); |
| p2.h = hi(IPEND); |
| r0 = [p2]; |
| [sp + PT_IPEND] = r0; |
| |
| /* set the EXCAUSE to HWERR for trap_c */ |
| r0 = [sp + PT_SEQSTAT]; |
| R1.L = LO(VEC_HWERR); |
| R1.H = HI(VEC_HWERR); |
| R0 = R0 | R1; |
| [sp + PT_SEQSTAT] = R0; |
| |
| r0 = sp; /* stack frame pt_regs pointer argument ==> r0 */ |
| SP += -12; |
| call _trap_c; |
| SP += 12; |
| |
| #ifdef EBIU_ERRMST |
| /* make sure EBIU_ERRMST is clear */ |
| p0.l = LO(EBIU_ERRMST); |
| p0.h = HI(EBIU_ERRMST); |
| r0.l = (CORE_ERROR | CORE_MERROR); |
| w[p0] = r0.l; |
| #endif |
| |
| call _ret_from_exception; |
| |
| .Lcommon_restore_all_sys: |
| RESTORE_ALL_SYS |
| rti; |
| ENDPROC(_evt_ivhw) |
| |
| /* Interrupt routine for evt2 (NMI). |
| * We don't actually use this, so just return. |
| * For inner circle type details, please see: |
| * http://docs.blackfin.uclinux.org/doku.php?id=linux:nmi |
| */ |
| ENTRY(_evt_nmi) |
| .weak _evt_nmi |
| rtn; |
| ENDPROC(_evt_nmi) |
| |
| /* interrupt routine for core timer - 6 */ |
| ENTRY(_evt_timer) |
| TIMER_INTERRUPT_ENTRY(EVT_IVTMR_P) |
| |
| /* interrupt routine for evt7 - 7 */ |
| ENTRY(_evt_evt7) |
| INTERRUPT_ENTRY(EVT_IVG7_P) |
| ENTRY(_evt_evt8) |
| INTERRUPT_ENTRY(EVT_IVG8_P) |
| ENTRY(_evt_evt9) |
| INTERRUPT_ENTRY(EVT_IVG9_P) |
| ENTRY(_evt_evt10) |
| INTERRUPT_ENTRY(EVT_IVG10_P) |
| ENTRY(_evt_evt11) |
| INTERRUPT_ENTRY(EVT_IVG11_P) |
| ENTRY(_evt_evt12) |
| INTERRUPT_ENTRY(EVT_IVG12_P) |
| ENTRY(_evt_evt13) |
| INTERRUPT_ENTRY(EVT_IVG13_P) |
| |
| |
| /* interrupt routine for system_call - 15 */ |
| ENTRY(_evt_system_call) |
| SAVE_CONTEXT_SYSCALL |
| #ifdef CONFIG_FRAME_POINTER |
| fp = 0; |
| #endif |
| call _system_call; |
| jump .Lcommon_restore_context; |
| ENDPROC(_evt_system_call) |
| |
| #ifdef CONFIG_IPIPE |
| ENTRY(___ipipe_call_irqtail) |
| r0.l = 1f; |
| r0.h = 1f; |
| reti = r0; |
| rti; |
| 1: |
| [--sp] = rets; |
| [--sp] = ( r7:4, p5:3 ); |
| p0.l = ___ipipe_irq_tail_hook; |
| p0.h = ___ipipe_irq_tail_hook; |
| p0 = [p0]; |
| sp += -12; |
| call (p0); |
| sp += 12; |
| ( r7:4, p5:3 ) = [sp++]; |
| rets = [sp++]; |
| |
| [--sp] = reti; |
| reti = [sp++]; /* IRQs are off. */ |
| r0.h = 3f; |
| r0.l = 3f; |
| p0.l = lo(EVT14); |
| p0.h = hi(EVT14); |
| [p0] = r0; |
| csync; |
| r0 = 0x401f; |
| sti r0; |
| raise 14; |
| [--sp] = reti; /* IRQs on. */ |
| 2: |
| jump 2b; /* Likely paranoid. */ |
| 3: |
| sp += 4; /* Discard saved RETI */ |
| r0.h = _evt14_softirq; |
| r0.l = _evt14_softirq; |
| p0.l = lo(EVT14); |
| p0.h = hi(EVT14); |
| [p0] = r0; |
| csync; |
| p0.l = _bfin_irq_flags; |
| p0.h = _bfin_irq_flags; |
| r0 = [p0]; |
| sti r0; |
| #if 0 /* FIXME: this actually raises scheduling latencies */ |
| /* Reenable interrupts */ |
| [--sp] = reti; |
| r0 = [sp++]; |
| #endif |
| rts; |
| ENDPROC(___ipipe_call_irqtail) |
| #endif /* CONFIG_IPIPE */ |