1 From a05852e828063b6731fcac543b87367c137c16f8 Mon Sep 17 00:00:00 2001
2 From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
3 Date: Thu, 6 Jun 2013 18:21:18 +0200
4 Subject: [PATCH 073/203] of: pci: add registry of MSI chips
6 This commit adds a very basic registry of msi_chip structures, so that
7 an IRQ controller driver can register an msi_chip, and a PCIe host
8 controller can find it, based on a 'struct device_node'.
10 Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
11 Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
12 Acked-by: Rob Herring <rob.herring@calxeda.com>
14 drivers/of/of_pci.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
15 include/linux/msi.h | 2 ++
16 include/linux/of_pci.h | 12 ++++++++++++
17 3 files changed, 59 insertions(+)
19 --- a/drivers/of/of_pci.c
20 +++ b/drivers/of/of_pci.c
21 @@ -89,3 +89,48 @@ int of_pci_parse_bus_range(struct device
24 EXPORT_SYMBOL_GPL(of_pci_parse_bus_range);
26 +#ifdef CONFIG_PCI_MSI
28 +static LIST_HEAD(of_pci_msi_chip_list);
29 +static DEFINE_MUTEX(of_pci_msi_chip_mutex);
31 +int of_pci_msi_chip_add(struct msi_chip *chip)
33 + if (!of_property_read_bool(chip->of_node, "msi-controller"))
36 + mutex_lock(&of_pci_msi_chip_mutex);
37 + list_add(&chip->list, &of_pci_msi_chip_list);
38 + mutex_unlock(&of_pci_msi_chip_mutex);
42 +EXPORT_SYMBOL_GPL(of_pci_msi_chip_add);
44 +void of_pci_msi_chip_remove(struct msi_chip *chip)
46 + mutex_lock(&of_pci_msi_chip_mutex);
47 + list_del(&chip->list);
48 + mutex_unlock(&of_pci_msi_chip_mutex);
50 +EXPORT_SYMBOL_GPL(of_pci_msi_chip_remove);
52 +struct msi_chip *of_pci_find_msi_chip_by_node(struct device_node *of_node)
56 + mutex_lock(&of_pci_msi_chip_mutex);
57 + list_for_each_entry(c, &of_pci_msi_chip_list, list) {
58 + if (c->of_node == of_node) {
59 + mutex_unlock(&of_pci_msi_chip_mutex);
63 + mutex_unlock(&of_pci_msi_chip_mutex);
67 +EXPORT_SYMBOL_GPL(of_pci_find_msi_chip_by_node);
69 +#endif /* CONFIG_PCI_MSI */
70 --- a/include/linux/msi.h
71 +++ b/include/linux/msi.h
72 @@ -67,6 +67,8 @@ void default_restore_msi_irqs(struct pci
76 + struct device_node *of_node;
77 + struct list_head list;
79 int (*setup_irq)(struct msi_chip *chip, struct pci_dev *dev,
80 struct msi_desc *desc);
81 --- a/include/linux/of_pci.h
82 +++ b/include/linux/of_pci.h
86 #include <linux/pci.h>
87 +#include <linux/msi.h>
91 @@ -13,4 +14,15 @@ struct device_node *of_pci_find_child_de
92 int of_pci_get_devfn(struct device_node *np);
93 int of_pci_parse_bus_range(struct device_node *node, struct resource *res);
95 +#if defined(CONFIG_OF) && defined(CONFIG_PCI_MSI)
96 +int of_pci_msi_chip_add(struct msi_chip *chip);
97 +void of_pci_msi_chip_remove(struct msi_chip *chip);
98 +struct msi_chip *of_pci_find_msi_chip_by_node(struct device_node *of_node);
100 +static inline int of_pci_msi_chip_add(struct msi_chip *chip) { return -EINVAL; }
101 +static inline void of_pci_msi_chip_remove(struct msi_chip *chip) { }
102 +static inline struct msi_chip *
103 +of_pci_find_msi_chip_by_node(struct device_node *of_node) { return NULL; }