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107 lines
3.2 KiB
Diff
107 lines
3.2 KiB
Diff
From a05852e828063b6731fcac543b87367c137c16f8 Mon Sep 17 00:00:00 2001
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From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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Date: Thu, 6 Jun 2013 18:21:18 +0200
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Subject: [PATCH 073/203] of: pci: add registry of MSI chips
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This commit adds a very basic registry of msi_chip structures, so that
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an IRQ controller driver can register an msi_chip, and a PCIe host
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controller can find it, based on a 'struct device_node'.
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Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Acked-by: Rob Herring <rob.herring@calxeda.com>
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---
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drivers/of/of_pci.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
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include/linux/msi.h | 2 ++
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include/linux/of_pci.h | 12 ++++++++++++
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3 files changed, 59 insertions(+)
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--- a/drivers/of/of_pci.c
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+++ b/drivers/of/of_pci.c
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@@ -89,3 +89,48 @@ int of_pci_parse_bus_range(struct device
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return 0;
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}
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EXPORT_SYMBOL_GPL(of_pci_parse_bus_range);
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+
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+#ifdef CONFIG_PCI_MSI
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+
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+static LIST_HEAD(of_pci_msi_chip_list);
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+static DEFINE_MUTEX(of_pci_msi_chip_mutex);
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+
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+int of_pci_msi_chip_add(struct msi_chip *chip)
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+{
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+ if (!of_property_read_bool(chip->of_node, "msi-controller"))
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+ return -EINVAL;
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+
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+ mutex_lock(&of_pci_msi_chip_mutex);
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+ list_add(&chip->list, &of_pci_msi_chip_list);
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+ mutex_unlock(&of_pci_msi_chip_mutex);
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+
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+ return 0;
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+}
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+EXPORT_SYMBOL_GPL(of_pci_msi_chip_add);
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+
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+void of_pci_msi_chip_remove(struct msi_chip *chip)
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+{
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+ mutex_lock(&of_pci_msi_chip_mutex);
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+ list_del(&chip->list);
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+ mutex_unlock(&of_pci_msi_chip_mutex);
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+}
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+EXPORT_SYMBOL_GPL(of_pci_msi_chip_remove);
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+
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+struct msi_chip *of_pci_find_msi_chip_by_node(struct device_node *of_node)
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+{
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+ struct msi_chip *c;
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+
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+ mutex_lock(&of_pci_msi_chip_mutex);
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+ list_for_each_entry(c, &of_pci_msi_chip_list, list) {
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+ if (c->of_node == of_node) {
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+ mutex_unlock(&of_pci_msi_chip_mutex);
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+ return c;
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+ }
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+ }
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+ mutex_unlock(&of_pci_msi_chip_mutex);
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+
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+ return NULL;
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+}
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+EXPORT_SYMBOL_GPL(of_pci_find_msi_chip_by_node);
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+
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+#endif /* CONFIG_PCI_MSI */
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--- a/include/linux/msi.h
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+++ b/include/linux/msi.h
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@@ -67,6 +67,8 @@ void default_restore_msi_irqs(struct pci
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struct msi_chip {
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struct module *owner;
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struct device *dev;
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+ struct device_node *of_node;
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+ struct list_head list;
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int (*setup_irq)(struct msi_chip *chip, struct pci_dev *dev,
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struct msi_desc *desc);
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--- a/include/linux/of_pci.h
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+++ b/include/linux/of_pci.h
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@@ -2,6 +2,7 @@
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#define __OF_PCI_H
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#include <linux/pci.h>
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+#include <linux/msi.h>
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struct pci_dev;
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struct of_irq;
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@@ -13,4 +14,15 @@ struct device_node *of_pci_find_child_de
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int of_pci_get_devfn(struct device_node *np);
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int of_pci_parse_bus_range(struct device_node *node, struct resource *res);
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+#if defined(CONFIG_OF) && defined(CONFIG_PCI_MSI)
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+int of_pci_msi_chip_add(struct msi_chip *chip);
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+void of_pci_msi_chip_remove(struct msi_chip *chip);
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+struct msi_chip *of_pci_find_msi_chip_by_node(struct device_node *of_node);
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+#else
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+static inline int of_pci_msi_chip_add(struct msi_chip *chip) { return -EINVAL; }
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+static inline void of_pci_msi_chip_remove(struct msi_chip *chip) { }
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+static inline struct msi_chip *
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+of_pci_find_msi_chip_by_node(struct device_node *of_node) { return NULL; }
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+#endif
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+
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#endif
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