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Commit 0d5a6db3 authored by Thomas Petazzoni's avatar Thomas Petazzoni Committed by Jason Cooper
Browse files

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: default avatarThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: default avatarRob Herring <rob.herring@calxeda.com>
Signed-off-by: default avatarJason Cooper <jason@lakedaemon.net>
parent 0cbdcfcf

drivers/of/of_pci.c

+45 −0
Original line number Diff line number Diff line
@@ -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 */

include/linux/msi.h

+2 −0
Original line number Diff line number Diff line
@@ -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);

include/linux/of_pci.h

+12 −0
Original line number Diff line number Diff line
@@ -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