[PATCHv8 04/10] of: pci: add registry of MSI chips
From: Thomas Petazzoni <hidden>
Date: 2013-08-08 22:17:42
Also in:
linux-pci
Subsystem:
open firmware and flattened device tree, pci subsystem, the rest · Maintainers:
Rob Herring, Saravana Kannan, Bjorn Helgaas, Linus Torvalds
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 <redacted> --- drivers/of/of_pci.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ include/linux/msi.h | 2 ++ include/linux/of_pci.h | 12 ++++++++++++ 3 files changed, 59 insertions(+)
diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
index 42c687a..e5ca008 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 */
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 090ddad..b17ead8 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h@@ -68,6 +68,8 @@ 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 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..29631eb 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_pci_msi_chip_add(struct msi_chip *chip); +void of_pci_msi_chip_remove(struct msi_chip *chip); +struct msi_chip *of_pci_find_msi_chip_by_node(struct device_node *of_node); +#else +static inline int of_pci_msi_chip_add(struct msi_chip *chip) { return -EINVAL; } +static inline void of_pci_msi_chip_remove(struct msi_chip *chip) { } +static inline struct msi_chip * +of_pci_find_msi_chip_by_node(struct device_node *of_node) { return NULL }; +#endif + #endif
--
1.8.1.2