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-rw-r--r--arch/blackfin/mach-common/interrupt.S108
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 */