From: John Jacques <john.jacq...@lsi.com>
SEV/WFE are unusable in v1.0 silicon. The boot loader now sets bit 7
in the ACLTR register of each core, making wfe a nop. At present,
bit 7 of the ACTLR does not work in simulation and emulaton. Until
that is corrected, this work-around is necessary.
Signed-off-by: John Jacques <john.jacq...@lsi.com>
---
arch/arm/include/asm/spinlock.h | 5 ++++
arch/arm/mach-axxia/Makefile | 5 ++--
arch/arm/mach-axxia/ev.c | 55 +++++++++++++++++++++++++++++++++++++++
3 files changed, 63 insertions(+), 2 deletions(-)
create mode 100644 arch/arm/mach-axxia/ev.c
diff --git a/arch/arm/include/asm/spinlock.h b/arch/arm/include/asm/spinlock.h
index dd64cc6..6194795 100644
--- a/arch/arm/include/asm/spinlock.h
+++ b/arch/arm/include/asm/spinlock.h
@@ -88,7 +88,12 @@ static inline void arch_spin_lock(arch_spinlock_t *lock)
: "cc");
while (lockval.tickets.next != lockval.tickets.owner) {
+#ifdef CONFIG_ARCH_AXXIA
+ extern void __axxia_arch_wfe(void);
+ __axxia_arch_wfe();
+#else
wfe();
+#endif
lockval.tickets.owner = ACCESS_ONCE(lock->tickets.owner);
}
diff --git a/arch/arm/mach-axxia/Makefile b/arch/arm/mach-axxia/Makefile
index ae75ac7..33f1309 100644
--- a/arch/arm/mach-axxia/Makefile
+++ b/arch/arm/mach-axxia/Makefile
@@ -3,8 +3,9 @@
#
obj-y += axxia.o
obj-y += clock.o
-obj-y += io.o
-obj-y += ssp-gpio.o
+obj-y += ev.o
+obj-y += io.o
+obj-y += ssp-gpio.o
obj-y += ncr.o
obj-y += timers.o
obj-y += pci.o
diff --git a/arch/arm/mach-axxia/ev.c b/arch/arm/mach-axxia/ev.c
new file mode 100644
index 0000000..1647bbe
--- /dev/null
+++ b/arch/arm/mach-axxia/ev.c
@@ -0,0 +1,55 @@
+/*
+ * arch/arm/mach-axxia/ev.c
+ *
+ * Support for the LSI Axxia boards based on ARM cores.
+ *
+ * Copyright (C) 2012 LSI
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/of.h>
+#include <linux/of_fdt.h>
+#include <asm/page.h>
+#include <asm/io.h>
+
+static int initialized = 0;
+static int wfe_available;
+
+inline void
+__axxia_arch_wfe(void)
+{
+ if (0 == initialized) {
+ if (of_find_compatible_node(NULL, NULL,
+ "lsi,axm5516-sim") != NULL ||
+ of_find_compatible_node(NULL, NULL,
+ "lsi,axm5516-emu") != NULL)
+ wfe_available = 0;
+ else
+ wfe_available = 1;
+
+ initialized = 1;
+ }
+
+ if (0 != wfe_available) {
+ wfe();
+ }
+
+ return;
+}
+
+EXPORT_SYMBOL(__axxia_arch_wfe);
--
1.7.9.5
--
_______________________________________________
linux-yocto mailing list
linux-yocto@yoctoproject.org
https://lists.yoctoproject.org/listinfo/linux-yocto
