lkml.org 
[lkml]   [2015]   [Feb]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH v9 08/21] ARM64 / ACPI: Introduce PCI stub functions for ACPI
    Date
    CONFIG_ACPI depends CONFIG_PCI on x86 and ia64, in ARM64 server
    world we will have PCIe in most cases, but some of them may not,
    make CONFIG_ACPI depend CONFIG_PCI on ARM64 will satisfy both.

    With that case, we need some arch dependent PCI functions to
    access the config space before the PCI root bridge is created, and
    pci_acpi_scan_root() to create the PCI root bus. So introduce
    some stub function here to make ACPI core compile and revisit
    them later when implemented on ARM64.

    CC: Liviu Dudau <Liviu.Dudau@arm.com>
    CC: Catalin Marinas <catalin.marinas@arm.com>
    CC: Will Deacon <will.deacon@arm.com>
    Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
    Tested-by: Yijing Wang <wangyijing@huawei.com>
    Tested-by: Mark Langsdorf <mlangsdo@redhat.com>
    Tested-by: Jon Masters <jcm@redhat.com>
    Tested-by: Timur Tabi <timur@codeaurora.org>
    Tested-by: Robert Richter <rrichter@cavium.com>
    Acked-by: Robert Richter <rrichter@cavium.com>
    Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
    ---
    arch/arm64/include/asm/pci.h | 6 ++++++
    arch/arm64/kernel/pci.c | 25 +++++++++++++++++++++++++
    2 files changed, 31 insertions(+)

    diff --git a/arch/arm64/include/asm/pci.h b/arch/arm64/include/asm/pci.h
    index 872ba93..fded096 100644
    --- a/arch/arm64/include/asm/pci.h
    +++ b/arch/arm64/include/asm/pci.h
    @@ -24,6 +24,12 @@
    */
    #define PCI_DMA_BUS_IS_PHYS (0)

    +static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
    +{
    + /* no legacy IRQ on arm64 */
    + return -ENODEV;
    +}
    +
    extern int isa_dma_bridge_buggy;

    #ifdef CONFIG_PCI
    diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
    index 6f93c24..4095379 100644
    --- a/arch/arm64/kernel/pci.c
    +++ b/arch/arm64/kernel/pci.c
    @@ -10,6 +10,7 @@
    *
    */

    +#include <linux/acpi.h>
    #include <linux/init.h>
    #include <linux/io.h>
    #include <linux/kernel.h>
    @@ -46,3 +47,27 @@ int pcibios_add_device(struct pci_dev *dev)

    return 0;
    }
    +
    +/*
    + * raw_pci_read/write - Platform-specific PCI config space access.
    + */
    +int raw_pci_read(unsigned int domain, unsigned int bus,
    + unsigned int devfn, int reg, int len, u32 *val)
    +{
    + return -ENXIO;
    +}
    +
    +int raw_pci_write(unsigned int domain, unsigned int bus,
    + unsigned int devfn, int reg, int len, u32 val)
    +{
    + return -ENXIO;
    +}
    +
    +#ifdef CONFIG_ACPI
    +/* Root bridge scanning */
    +struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
    +{
    + /* TODO: Should be revisited when implementing PCI on ACPI */
    + return NULL;
    +}
    +#endif
    --
    1.9.1


    \
     
     \ /
      Last update: 2015-02-25 10:21    [W:5.939 / U:0.028 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site