of: pci: add registry of MSI chips

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>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

1 files changed, 45 insertions, 0 deletions

diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
index 42c687a820ac..e5ca00893c0c 100644
--- a/drivers/of/of_pci.c
+++ b/drivers/of/of_pci.c
@@ -89,3 +89,48 @@ 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(of_pci_msi_chip_list);
+static DEFINE_MUTEX(of_pci_msi_chip_mutex);
+
+int of_pci_msi_chip_add(struct msi_chip *chip)
+{
+        if (!of_property_read_bool(chip->of_node, "msi-controller"))
+                return -EINVAL;
+
+        mutex_lock(&of_pci_msi_chip_mutex);
+        list_add(&chip->list, &of_pci_msi_chip_list);
+        mutex_unlock(&of_pci_msi_chip_mutex);
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(of_pci_msi_chip_add);
+
+void of_pci_msi_chip_remove(struct msi_chip *chip)
+{
+        mutex_lock(&of_pci_msi_chip_mutex);
+        list_del(&chip->list);
+        mutex_unlock(&of_pci_msi_chip_mutex);
+}
+EXPORT_SYMBOL_GPL(of_pci_msi_chip_remove);
+
+struct msi_chip *of_pci_find_msi_chip_by_node(struct device_node *of_node)
+{
+        struct msi_chip *c;
+
+        mutex_lock(&of_pci_msi_chip_mutex);
+        list_for_each_entry(c, &of_pci_msi_chip_list, list) {
+                if (c->of_node == of_node) {
+                        mutex_unlock(&of_pci_msi_chip_mutex);
+                        return c;
+                }
+        }
+        mutex_unlock(&of_pci_msi_chip_mutex);
+
+        return NULL;
+}
+EXPORT_SYMBOL_GPL(of_pci_find_msi_chip_by_node);
+
+#endif /* CONFIG_PCI_MSI */