diff options
Diffstat (limited to 'arch/blackfin/mach-common/interrupt.S')
| -rw-r--r-- | arch/blackfin/mach-common/interrupt.S | 108 |
1 files changed, 43 insertions, 65 deletions
diff --git a/arch/blackfin/mach-common/interrupt.S b/arch/blackfin/mach-common/interrupt.S index 9c46680186e4..8085ff1cce00 100644 --- a/arch/blackfin/mach-common/interrupt.S +++ b/arch/blackfin/mach-common/interrupt.S @@ -1,31 +1,11 @@ /* - * 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. + * Interrupt Entries * - * 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. + * Copyright 2005-2009 Analog Devices Inc. + * D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca> + * Kenneth Albanowski <kjahds@kjahds.com> * - * 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 + * Licensed under the GPL-2 or later. */ #include <asm/blackfin.h> @@ -119,14 +99,8 @@ __common_int_entry: 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 + ANOMALY_283_315_WORKAROUND(p5, r7) + r1 = sp; SP += -12; #ifdef CONFIG_IPIPE @@ -158,14 +132,7 @@ ENTRY(_evt_ivhw) 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 + ANOMALY_283_315_WORKAROUND(p5, r7) /* Handle all stacked hardware errors * To make sure we don't hang forever, only do it 10 times @@ -261,6 +228,31 @@ ENTRY(_evt_system_call) ENDPROC(_evt_system_call) #ifdef CONFIG_IPIPE +/* + * __ipipe_call_irqtail: lowers the current priority level to EVT15 + * before running a user-defined routine, then raises the priority + * level to EVT14 to prepare the caller for a normal interrupt + * return through RTI. + * + * We currently use this facility in two occasions: + * + * - to branch to __ipipe_irq_tail_hook as requested by a high + * priority domain after the pipeline delivered an interrupt, + * e.g. such as Xenomai, in order to start its rescheduling + * procedure, since we may not switch tasks when IRQ levels are + * nested on the Blackfin, so we have to fake an interrupt return + * so that we may reschedule immediately. + * + * - to branch to sync_root_irqs, in order to play any interrupt + * pending for the root domain (i.e. the Linux kernel). This lowers + * the core priority level enough so that Linux IRQ handlers may + * never delay interrupts handled by high priority domains; we defer + * those handlers until this point instead. This is a substitute + * to using a threaded interrupt model for the Linux kernel. + * + * r0: address of user-defined routine + * context: caller must have preempted EVT15, hw interrupts must be off. + */ ENTRY(___ipipe_call_irqtail) p0 = r0; r0.l = 1f; @@ -276,33 +268,19 @@ ENTRY(___ipipe_call_irqtail) ( 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 (z); +#ifdef CONFIG_DEBUG_HWERR + /* enable irq14 & hwerr interrupt, until we transition to _evt_evt14 */ + r0 = (EVT_IVG14 | EVT_IVHW | \ + EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU); +#else + /* Only enable irq14 interrupt, until we transition to _evt_evt14 */ + r0 = (EVT_IVG14 | \ + EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU); +#endif sti r0; - raise 14; - [--sp] = reti; /* IRQs on. */ + raise 14; /* Branches to _evt_evt14 */ 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; - rts; ENDPROC(___ipipe_call_irqtail) #endif /* CONFIG_IPIPE */ |