0d5a6db3aa
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>
81 lines
2.5 KiB
C
81 lines
2.5 KiB
C
#ifndef LINUX_MSI_H
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#define LINUX_MSI_H
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#include <linux/kobject.h>
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#include <linux/list.h>
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struct msi_msg {
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u32 address_lo; /* low 32 bits of msi message address */
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u32 address_hi; /* high 32 bits of msi message address */
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u32 data; /* 16 bits of msi message data */
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};
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/* Helper functions */
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struct irq_data;
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struct msi_desc;
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void mask_msi_irq(struct irq_data *data);
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void unmask_msi_irq(struct irq_data *data);
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void __read_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
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void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
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void __write_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
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void read_msi_msg(unsigned int irq, struct msi_msg *msg);
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void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg);
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void write_msi_msg(unsigned int irq, struct msi_msg *msg);
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struct msi_desc {
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struct {
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__u8 is_msix : 1;
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__u8 multiple: 3; /* log2 number of messages */
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__u8 maskbit : 1; /* mask-pending bit supported ? */
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__u8 is_64 : 1; /* Address size: 0=32bit 1=64bit */
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__u8 pos; /* Location of the msi capability */
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__u16 entry_nr; /* specific enabled entry */
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unsigned default_irq; /* default pre-assigned irq */
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} msi_attrib;
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u32 masked; /* mask bits */
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unsigned int irq;
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unsigned int nvec_used; /* number of messages */
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struct list_head list;
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union {
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void __iomem *mask_base;
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u8 mask_pos;
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};
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struct pci_dev *dev;
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/* Last set MSI message */
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struct msi_msg msg;
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struct kobject kobj;
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};
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/*
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* The arch hooks to setup up msi irqs. Those functions are
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* implemented as weak symbols so that they /can/ be overriden by
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* architecture specific code if needed.
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*/
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int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc);
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void arch_teardown_msi_irq(unsigned int irq);
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int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
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void arch_teardown_msi_irqs(struct pci_dev *dev);
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int arch_msi_check_device(struct pci_dev* dev, int nvec, int type);
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void arch_restore_msi_irqs(struct pci_dev *dev, int irq);
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void default_teardown_msi_irqs(struct pci_dev *dev);
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void default_restore_msi_irqs(struct pci_dev *dev, int irq);
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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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void (*teardown_irq)(struct msi_chip *chip, unsigned int irq);
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int (*check_device)(struct msi_chip *chip, struct pci_dev *dev,
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int nvec, int type);
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};
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#endif /* LINUX_MSI_H */
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