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Subject[PATCH] [RFC] Add AArch64 support for PCI
Date
Hi,

This patch adds support for PCI to AArch64. It is based on the patch posted
here [1] that adds support for creating generic host bridge structure from
device tree. With that in place, I was able to boot an FPGA platform that
has PCIe host bridge support and use a PCIe network card.

The API used is different from the one used by ARM architecture. There is
no pci_common_init_dev() function and no hw_pci structure, as that is no
longer needed. Once the last signature is added to the legal agreement, I
will post the host bridge driver code that I am using. Meanwhile, here
is an example of what the probe function looks like, posted as an example:

static int myhostbridge_probe(struct platform_device *pdev)
{
int err;
struct device_node *dev;
struct pci_host_bridge *bridge;
struct resource bus_range;
struct myhostbridge_port *pp;
LIST_HEAD(resources);

dev = pdev->dev.of_node;

if (!of_device_is_available(dev)) {
pr_warn("%s: disabled\n", dev->full_name);
return -ENODEV;
}

pp = kzalloc(sizeof(struct myhostbridge_port), GFP_KERNEL);
if (!pp)
return -ENOMEM;

err = of_pci_parse_bus_range(dev, &bus_range);
if (err) {
bus_range.start = 0;
bus_range.end = 255;
bus_range.flags = IORESOURCE_BUS;
}
pci_add_resource(&resources, &bus_range);

bridge = pci_host_bridge_of_init(&pdev->dev, 0, &myhostbridge_ops, pp, &resources);
if (!bridge) {
err = -EINVAL;
goto bridge_init_fail;
}

err = myhostbridge_setup(bridge->bus);
if (err)
goto bridge_init_fail;

/*
* Add flags here, this is just an example
*/
pci_add_flags(PCI_ENABLE_PROC_DOMAINS | PCI_COMPAT_DOMAIN_0);
pci_add_flags(PCI_REASSIGN_ALL_BUS | PCI_REASSIGN_ALL_RSRC);

bus_range.end = pci_scan_child_bus(bridge->bus);
pci_bus_update_busn_res_end(bridge->bus, bus_range.end);

pci_assign_unassigned_bus_resources(bridge->bus);

pci_bus_add_devices(bridge->bus);

return 0;

bridge_init_fail:
kfree(pp);
pci_free_resource_list(&resources);
return err;
}

Best regards,
Liviu

[1] http://marc.info/?l=linux-pci&m=139145254821334&w=2

Liviu Dudau (1):
arm64: Add support for PCI

arch/arm64/Kconfig | 17 +++++++
arch/arm64/include/asm/Kbuild | 1 +
arch/arm64/include/asm/io.h | 4 ++
arch/arm64/include/asm/pci.h | 35 +++++++++++++
arch/arm64/kernel/Makefile | 1 +
arch/arm64/kernel/pci.c | 112 ++++++++++++++++++++++++++++++++++++++++++
6 files changed, 170 insertions(+)
create mode 100644 arch/arm64/include/asm/pci.h
create mode 100644 arch/arm64/kernel/pci.c

--
1.8.5.3



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