openwrtv3/target/linux/mvebu/patches-3.10/0072-PCI-Introduce-new-MSI-chip-infrastructure.patch
Luka Perkov 3af779eb17 mvebu: backport mainline patches from kernel 3.12
This is a backport of the patches accepted to the Linux mainline related to
mvebu SoC (Armada XP and Armada 370) between Linux v3.11, and Linux v3.12.
This work mainly covers:

* Ground work for sharing the pxa nand driver(drivers/mtd/nand/pxa3xx_nand.c)
  between the PXA family,and the Armada family.
* Further updates to the mvebu MBus.
* Work and ground work for enabling MSI on the Armada family.
* some phy / mdio bus initialization related work.
* Device tree binding documentation update.

Signed-off-by: Seif Mazareeb <seif.mazareeb@gmail.com>
CC: Luka Perkov <luka@openwrt.org>

SVN-Revision: 39565
2014-02-11 02:07:41 +00:00

108 lines
3.3 KiB
Diff

From 9c6ddccbbfaf789beccc6a1d87abe9bc60dc570f Mon Sep 17 00:00:00 2001
From: Thierry Reding <thierry.reding@avionic-design.de>
Date: Thu, 6 Jun 2013 18:20:29 +0200
Subject: [PATCH 072/203] PCI: Introduce new MSI chip infrastructure
The new struct msi_chip is used to associated an MSI controller with a
PCI bus. It is automatically handed down from the root to its children
during bus enumeration.
This patch provides default (weak) implementations for the architecture-
specific MSI functions (arch_setup_msi_irq(), arch_teardown_msi_irq()
and arch_msi_check_device()) which check if a PCI device's bus has an
attached MSI chip and forward the call appropriately.
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Daniel Price <daniel.price@gmail.com>
Tested-by: Thierry Reding <thierry.reding@gmail.com>
---
drivers/pci/msi.c | 27 +++++++++++++++++++++++++--
drivers/pci/probe.c | 1 +
include/linux/msi.h | 11 +++++++++++
include/linux/pci.h | 1 +
4 files changed, 38 insertions(+), 2 deletions(-)
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -32,16 +32,39 @@ static int pci_msi_enable = 1;
int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
{
- return -EINVAL;
+ struct msi_chip *chip = dev->bus->msi;
+ int err;
+
+ if (!chip || !chip->setup_irq)
+ return -EINVAL;
+
+ err = chip->setup_irq(chip, dev, desc);
+ if (err < 0)
+ return err;
+
+ irq_set_chip_data(desc->irq, chip);
+
+ return 0;
}
void __weak arch_teardown_msi_irq(unsigned int irq)
{
+ struct msi_chip *chip = irq_get_chip_data(irq);
+
+ if (!chip || !chip->teardown_irq)
+ return;
+
+ chip->teardown_irq(chip, irq);
}
int __weak arch_msi_check_device(struct pci_dev *dev, int nvec, int type)
{
- return 0;
+ struct msi_chip *chip = dev->bus->msi;
+
+ if (!chip || !chip->check_device)
+ return 0;
+
+ return chip->check_device(chip, dev, nvec, type);
}
int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -634,6 +634,7 @@ static struct pci_bus *pci_alloc_child_b
child->parent = parent;
child->ops = parent->ops;
+ child->msi = parent->msi;
child->sysdata = parent->sysdata;
child->bus_flags = parent->bus_flags;
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -64,4 +64,15 @@ void arch_restore_msi_irqs(struct pci_de
void default_teardown_msi_irqs(struct pci_dev *dev);
void default_restore_msi_irqs(struct pci_dev *dev, int irq);
+struct msi_chip {
+ struct module *owner;
+ struct device *dev;
+
+ int (*setup_irq)(struct msi_chip *chip, struct pci_dev *dev,
+ struct msi_desc *desc);
+ void (*teardown_irq)(struct msi_chip *chip, unsigned int irq);
+ int (*check_device)(struct msi_chip *chip, struct pci_dev *dev,
+ int nvec, int type);
+};
+
#endif /* LINUX_MSI_H */
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -432,6 +432,7 @@ struct pci_bus {
struct resource busn_res; /* bus numbers routed to this bus */
struct pci_ops *ops; /* configuration access functions */
+ struct msi_chip *msi; /* MSI controller */
void *sysdata; /* hook for sys-specific extension */
struct proc_dir_entry *procdir; /* directory entry in /proc/bus/pci */