[PATCHv4 05/11] of: pci: add registry of MSI chips

[Thomas Petazzoni <thomas.petazzoni@free-electrons.com>]

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@free-electrons.com>
---
 drivers/of/of_pci.c    | 40 ++++++++++++++++++++++++++++++++++++++++
 include/linux/msi.h    |  2 ++
 include/linux/of_pci.h | 12 ++++++++++++
 3 files changed, 54 insertions(+)

diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
index 42c687a..f516632 100644
--- a/drivers/of/of_pci.c
+++ b/drivers/of/of_pci.c
@@ -89,3 +89,43 @@ int of_pci_parse_bus_range(struct device_node *node, struct resource *res)
 	return 0;
 }
 EXPORT_SYMBOL_GPL(of_pci_parse_bus_range);
+
+#ifdef CONFIG_PCI_MSI
+
+static LIST_HEAD(msi_chip_list);
+static DEFINE_MUTEX(msi_chip_mutex);
+
+int of_msi_chip_add(struct msi_chip *chip)
+{
+	if (! of_property_read_bool(chip->of_node, "msi-controller"))
+		return -EINVAL;
+
+	mutex_lock(&msi_chip_mutex);
+	list_add(&chip->list, &msi_chip_list);
+	mutex_unlock(&msi_chip_mutex);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(of_msi_chip_add);
+
+void of_msi_chip_remove(struct msi_chip *chip)
+{
+	mutex_lock(&msi_chip_mutex);
+	list_del(&chip->list);
+	mutex_unlock(&msi_chip_mutex);
+}
+EXPORT_SYMBOL_GPL(of_msi_chip_remove);
+
+struct msi_chip *of_find_msi_chip_by_node(struct device_node *of_node)
+{
+	struct msi_chip *c;
+	list_for_each_entry(c, &msi_chip_list, list) {
+		if (c->of_node == of_node)
+			return c;
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(of_find_msi_chip_by_node);
+
+#endif /* CONFIG_PCI_MSI */
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 5b357d92..9e1a44b 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -66,6 +66,8 @@ void default_teardown_msi_irqs(struct pci_dev *dev);
 struct msi_chip {
 	struct module *owner;
 	struct device *dev;
+	struct device_node *of_node;
+	struct list_head list;
 
 	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..99e4361 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 +14,15 @@ 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);
 
+#if defined(CONFIG_OF) && defined(CONFIG_PCI_MSI)
+int of_msi_chip_add(struct msi_chip *chip);
+void of_msi_chip_remove(struct msi_chip *chip);
+struct msi_chip *of_find_msi_chip_by_node(struct device_node *of_node);
+#else
+static inline int of_msi_chip_add(struct msi_chip *chip) { return -EINVAL; }
+static inline void of_msi_chip_remove(struct msi_chip *chip) { }
+static inline struct msi_chip *
+of_find_msi_chip_by_node(struct device_node *of_node) { return NULL };
+#endif
+
 #endif
-- 
1.8.1.2