On Tue, May 26, 2015 at 01:49:24PM +0100, Hanjun Guo wrote:
> Based on Jiang Liu's common interface to support PCI host bridge
> init and refactoring of MMCONFIG, this patch using information
> from ACPI MCFG table and IO/irq resources from _CRS to init
> ARM64 PCI hostbridge, then PCI will work on ARM64.
>
> This patch is based on Mark Salter and Tomasz Nowicki's work.
>
> Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
> Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
> CC: Arnd Bergmann <arnd@xxxxxxxx>
> CC: Catalin Marinas <catalin.marinas@xxxxxxx>
> CC: Liviu Dudau <Liviu.Dudau@xxxxxxx>
> CC: Lorenzo Pieralisi <Lorenzo.Pieralisi@xxxxxxx>
> CC: Will Deacon <will.deacon@xxxxxxx>
> ---
> arch/arm64/Kconfig | 7 ++
> arch/arm64/kernel/pci.c | 245 +++++++++++++++++++++++++++++++++++++++++++++---
> drivers/pci/pci.c | 26 +++--
> 3 files changed, 257 insertions(+), 21 deletions(-)
>
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 9b80428..8e4b789 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -276,6 +276,13 @@ config PCI_DOMAINS_GENERIC
> config PCI_SYSCALL
> def_bool PCI
>
> +config PCI_MMCONFIG
> + def_bool y
> + select PCI_ECAM
> + select HAVE_PCI_ECAM
> + select GENERIC_PCI_ECAM
> + depends on ACPI
> +
> source "drivers/pci/Kconfig"
> source "drivers/pci/pcie/Kconfig"
> source "drivers/pci/hotplug/Kconfig"
> diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
> index 4095379..d1629dc 100644
> --- a/arch/arm64/kernel/pci.c
> +++ b/arch/arm64/kernel/pci.c
> @@ -11,12 +11,15 @@
> */
>
> #include <linux/acpi.h>
> +#include <linux/ecam.h>
> #include <linux/init.h>
> #include <linux/io.h>
> #include <linux/kernel.h>
> #include <linux/mm.h>
> +#include <linux/of_address.h>
> #include <linux/of_pci.h>
> #include <linux/of_platform.h>
> +#include <linux/pci-acpi.h>
> #include <linux/slab.h>
>
> #include <asm/pci-bridge.h>
> @@ -43,31 +46,251 @@ resource_size_t pcibios_align_resource(void *data, const struct resource *res,
> */
> int pcibios_add_device(struct pci_dev *dev)
> {
> - dev->irq = of_irq_parse_and_map_pci(dev, 0, 0);
> + if (acpi_disabled)
> + dev->irq = of_irq_parse_and_map_pci(dev, 0, 0);
>
> return 0;
> }
>
> +#ifdef CONFIG_ACPI
> +int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
> +{
> + struct pci_controller *sd = bridge->bus->sysdata;
> +
> + ACPI_COMPANION_SET(&bridge->dev, sd->companion);
> + return 0;
> +}
> +
> +void pcibios_add_bus(struct pci_bus *bus)
> +{
> + acpi_pci_add_bus(bus);
> +}
> +
> +void pcibios_remove_bus(struct pci_bus *bus)
> +{
> + acpi_pci_remove_bus(bus);
> +}
> +
> +int pcibios_enable_irq(struct pci_dev *dev)
> +{
> + if (!pci_dev_msi_enabled(dev))
> + acpi_pci_irq_enable(dev);
> + return 0;
> +}
> +
> +int pcibios_disable_irq(struct pci_dev *dev)
> +{
> + if (!pci_dev_msi_enabled(dev))
> + acpi_pci_irq_disable(dev);
> + return 0;
> +}
> +
> +int pcibios_enable_device(struct pci_dev *dev, int bars)
> +{
> + int err;
> +
> + err = pci_enable_resources(dev, bars);
> + if (err < 0)
> + return err;
> +
> + return pcibios_enable_irq(dev);
> +}
> +
> +static int __init pcibios_assign_resources(void)
> +{
> + struct pci_bus *root_bus;
> +
> + if (acpi_disabled)
> + return 0;
> +
> + list_for_each_entry(root_bus, &pci_root_buses, node) {
> + pcibios_resource_survey_bus(root_bus);
> + pci_assign_unassigned_root_bus_resources(root_bus);
> + }
> + return 0;
> +}
I'm starting to sound like a stuck record (and getting bored of it
myself!), but none of this looks arch-specific. Can it be moved into the
core?
Will
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