This commit adds a very basic registry of msi_chip structures, so that
an IRQ controller driver can register an msi_chip, and a PCIe host
controller can find it, based on a 'struct device_node'.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx>
---
drivers/of/of_pci.c | 22 ++++++++++++++++++++++
include/linux/msi.h | 2 ++
include/linux/of_pci.h | 4 ++++
3 files changed, 28 insertions(+)
diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
index 42c687a..ca12db8 100644
--- a/drivers/of/of_pci.c
+++ b/drivers/of/of_pci.c
@@ -89,3 +89,25 @@ int of_pci_parse_bus_range(struct device_node *node, struct resource *res)
return 0;
}
EXPORT_SYMBOL_GPL(of_pci_parse_bus_range);
+
+static LIST_HEAD(msi_chip_list);
+static DEFINE_MUTEX(msi_chip_mutex);
+
+void of_msi_chip_add(struct msi_chip *chip)
+{
+ mutex_lock(&msi_chip_mutex);
+ list_add(&chip->link, &msi_chip_list);
+ mutex_unlock(&msi_chip_mutex);
+}
+
+struct msi_chip *of_msi_chip_find_by_node(struct device_node *of_node)
+{
+ struct msi_chip *c;
+ list_for_each_entry(c, &msi_chip_list, link) {
+ if (c->of_node == of_node &&
+ of_property_read_bool(c->of_node, "msi-controller"))
+ return c;
+ }
+
+ return NULL;
+}
diff --git a/include/linux/msi.h b/include/linux/msi.h
index e3a137d..8b930c3 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -74,6 +74,8 @@ void default_restore_msi_irqs(struct pci_dev *dev, int irq);
struct msi_chip {
struct module *owner;
struct device *dev;
+ struct device_node *of_node;
+ struct list_head link;
int (*setup_irq)(struct msi_chip *chip, struct pci_dev *dev,
struct msi_desc *desc);
diff --git a/include/linux/of_pci.h b/include/linux/of_pci.h
index 7a04826..6e88189 100644
--- a/include/linux/of_pci.h
+++ b/include/linux/of_pci.h
@@ -2,6 +2,7 @@
#define __OF_PCI_H
#include <linux/pci.h>
+#include <linux/msi.h>
struct pci_dev;
struct of_irq;
@@ -13,4 +14,7 @@ struct device_node *of_pci_find_child_device(struct device_node *parent,
int of_pci_get_devfn(struct device_node *np);
int of_pci_parse_bus_range(struct device_node *node, struct resource *res);
+void of_msi_chip_add(struct msi_chip *chip);
+struct msi_chip *of_msi_chip_find_by_node(struct device_node *of_node);
+
#endif
--
1.8.1.2
--
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