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Message-Id: <1242641100-15324-2-git-send-email-qingtao.cao@windriver.com>
Date: Mon, 18 May 2009 18:04:57 +0800
From: Harry Ciao <qingtao.cao@...driver.com>
To: benh@...nel.crashing.org, bluesmoke-devel@...ts.sourceforge.net
Cc: linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org
Subject: [v1 PATCH 1/4] EDAC: MPIC Hypertransport IRQ support
Collect the machine specific code that creates the hwirq2virq mapping
for the possible multiple EDAC modules on the same machine that supports
MPIC.
Multiple calling of irq_create_of_mapping() for the same hwirq will
always return the same virq, since the mapping won't be refcounted so
we just don't call irq_dispose_mapping() against it. This won't occupy
unnecessary resource since irq_map[] is of fixed size(==512).
The edac_mpic_irq.c is inert for EDAC drivers where related hardware
is not connecting to MPIC, so it should be controlled by CONFIG_MPIC.
Signed-off-by: Harry Ciao <qingtao.cao@...driver.com>
---
drivers/edac/Makefile | 4 ++
drivers/edac/edac_mpic_irq.c | 86 ++++++++++++++++++++++++++++++++++++++++++
include/linux/edac.h | 20 ++++++++++
3 files changed, 110 insertions(+), 0 deletions(-)
create mode 100644 drivers/edac/edac_mpic_irq.c
diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile
index 07a31cf..62778ee 100644
--- a/drivers/edac/Makefile
+++ b/drivers/edac/Makefile
@@ -17,6 +17,10 @@ ifdef CONFIG_PCI
edac_core-objs += edac_pci.o edac_pci_sysfs.o
endif
+ifdef CONFIG_MPIC
+edac_core-objs += edac_mpic_irq.o
+endif
+
obj-$(CONFIG_EDAC_AMD76X) += amd76x_edac.o
obj-$(CONFIG_EDAC_CPC925) += cpc925_edac.o
obj-$(CONFIG_EDAC_I5000) += i5000_edac.o
diff --git a/drivers/edac/edac_mpic_irq.c b/drivers/edac/edac_mpic_irq.c
new file mode 100644
index 0000000..7486b15
--- /dev/null
+++ b/drivers/edac/edac_mpic_irq.c
@@ -0,0 +1,86 @@
+/*
+ * edac_mpic_irq.c -
+ * Collect the machine specific code that creates the hwirq2virq
+ * mapping for the possible multiple EDAC modules on the same
+ * machine that supports MPIC.
+ *
+ * Copyright (c) 2009 Wind River Systems, Inc.
+ *
+ * Authors: Cao Qingtao <qingtao.cao@...driver.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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/kernel.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/of.h>
+#include <linux/edac.h>
+
+#ifdef CONFIG_PPC_MAPLE
+static int edac_maple_get_irq(int hwirq)
+{
+ struct device_node *np, *mpic_node = NULL;
+ int irq = NO_IRQ;
+
+ /*
+ * Locate MPIC in the device-tree. Note that there is a bug
+ * in Maple device-tree where the type of the controller is
+ * open-pic and not interrupt-controller
+ */
+ for_each_node_by_type(np, "interrupt-controller") {
+ if (of_device_is_compatible(np, "open-pic")) {
+ mpic_node = np;
+ break;
+ }
+ }
+
+ if (mpic_node == NULL) {
+ for_each_node_by_type(np, "open-pic") {
+ mpic_node = np;
+ break;
+ }
+ }
+
+ if (mpic_node) {
+ irq = irq_create_of_mapping(mpic_node, &hwirq, 1);
+ of_node_put(mpic_node);
+ } else
+ printk(KERN_ERR "Failed to locate the MPIC DTB node\n");
+
+ return irq;
+}
+#endif
+
+/*
+ * NOTE:
+ * The EDAC driver should implement and register its machine-specific
+ * method to get a virtual IRQ here.
+ */
+int edac_get_mpic_irq(int hwirq)
+{
+ int virq = NO_IRQ;
+
+ if ((hwirq != MPIC_HWIRQ_HT_NMI) &&
+ (hwirq != MPIC_HWIRQ_INTERNAL_ERROR))
+ return NO_IRQ;
+
+#ifdef CONFIG_PPC_MAPLE
+ virq = edac_maple_get_irq(hwirq);
+#endif
+
+ return virq;
+
+}
+EXPORT_SYMBOL_GPL(edac_get_mpic_irq);
diff --git a/include/linux/edac.h b/include/linux/edac.h
index 7cf92e8..c122d22 100644
--- a/include/linux/edac.h
+++ b/include/linux/edac.h
@@ -38,4 +38,24 @@ static inline void opstate_init(void)
return;
}
+#ifdef CONFIG_MPIC
+enum {
+ /*
+ * Vector carried in southbridge NMI Request Messages
+ * posted through Hypertransport Channel
+ */
+ MPIC_HWIRQ_HT_NMI = 0,
+
+ /*
+ * Vector for MPIC Internal Error
+ */
+ MPIC_HWIRQ_INTERNAL_ERROR = 2,
+
+ MPIC_HWIRQS, /* must be the very last */
+};
+
+/* Create a hwirq2virq mapping for the specified hwirq */
+extern int edac_get_mpic_irq(int hwirq);
+#endif
+
#endif
--
1.5.6.2
--
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