diff options
Diffstat (limited to 'arch/arm64/kernel/pci.c')
| -rw-r--r-- | arch/arm64/kernel/pci.c | 208 |
1 files changed, 196 insertions, 12 deletions
diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c index b3d098bd34aa..66cc1ae54db5 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> @@ -52,35 +55,216 @@ int pcibios_enable_device(struct pci_dev *dev, int mask) } /* - * Try to assign the IRQ number from DT when adding a new device + * Try to assign the IRQ number from DT/ACPI when adding a new device */ 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); +#ifdef CONFIG_ACPI + else + acpi_pci_irq_enable(dev); +#endif return 0; } +#ifdef CONFIG_ACPI +int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge) +{ + struct acpi_pci_root *root = bridge->bus->sysdata; + + ACPI_COMPANION_SET(&bridge->dev, root->device); + 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); +} + +static int __init pcibios_assign_resources(void) +{ + if (acpi_disabled) + return 0; + + pci_assign_unassigned_resources(); + return 0; +} /* - * raw_pci_read/write - Platform-specific PCI config space access. + * rootfs_initcall comes after subsys_initcall and fs_initcall_sync, + * so we know acpi scan and PCI_FIXUP_FINAL quirks have both run. */ -int raw_pci_read(unsigned int domain, unsigned int bus, - unsigned int devfn, int reg, int len, u32 *val) +rootfs_initcall(pcibios_assign_resources); + +static void __iomem * +pci_mcfg_dev_base(struct pci_bus *bus, unsigned int devfn, int offset) { - return -ENXIO; + struct pci_mmcfg_region *cfg; + + cfg = pci_mmconfig_lookup(pci_domain_nr(bus), bus->number); + if (cfg && cfg->virt) + return cfg->virt + + (PCI_MMCFG_BUS_OFFSET(bus->number) | (devfn << 12)) + + offset; + return NULL; } -int raw_pci_write(unsigned int domain, unsigned int bus, - unsigned int devfn, int reg, int len, u32 val) +struct pci_ops pci_root_ops = { + .map_bus = pci_mcfg_dev_base, + .read = pci_generic_config_read, + .write = pci_generic_config_write, +}; + +#ifdef CONFIG_PCI_MMCONFIG +static int pci_add_mmconfig_region(struct acpi_pci_root_info *ci) { - return -ENXIO; + struct pci_mmcfg_region *cfg; + struct acpi_pci_root *root; + int seg, start, end, err; + + root = ci->root; + seg = root->segment; + start = root->secondary.start; + end = root->secondary.end; + + cfg = pci_mmconfig_lookup(seg, start); + if (cfg) + return 0; + + cfg = pci_mmconfig_alloc(seg, start, end, root->mcfg_addr); + if (!cfg) + return -ENOMEM; + + err = pci_mmconfig_inject(cfg); + return err; } -#ifdef CONFIG_ACPI +static void pci_remove_mmconfig_region(struct acpi_pci_root_info *ci) +{ + struct acpi_pci_root *root = ci->root; + struct pci_mmcfg_region *cfg; + + cfg = pci_mmconfig_lookup(root->segment, root->secondary.start); + if (cfg) + return; + + if (cfg->hot_added) + pci_mmconfig_delete(root->segment, root->secondary.start, + root->secondary.end); +} +#else +static int pci_add_mmconfig_region(struct acpi_pci_root_info *ci) +{ + return 0; +} + +static void pci_remove_mmconfig_region(struct acpi_pci_root_info *ci) { } +#endif + +static int pci_acpi_root_init_info(struct acpi_pci_root_info *ci) +{ + return pci_add_mmconfig_region(ci); +} + +static void pci_acpi_root_release_info(struct acpi_pci_root_info *ci) +{ + pci_remove_mmconfig_region(ci); + kfree(ci); +} + +static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci) +{ + struct resource_entry *entry, *tmp; + int ret; + + ret = acpi_pci_probe_root_resources(ci); + if (ret < 0) + return ret; + + resource_list_for_each_entry_safe(entry, tmp, &ci->resources) { + struct resource *res = entry->res; + + /* + * Special handling for ARM IO range + * TODO: need to move pci_register_io_range() function out + * of drivers/of/address.c for both used by DT and ACPI + */ + if (res->flags & IORESOURCE_IO) { + unsigned long port; + int err; + resource_size_t length = res->end - res->start; + + err = pci_register_io_range(res->start, length); + if (err) { + resource_list_destroy_entry(entry); + continue; + } + + port = pci_address_to_pio(res->start); + if (port == (unsigned long)-1) { + resource_list_destroy_entry(entry); + continue; + } + + res->start = port; + res->end = res->start + length - 1; + + if (pci_remap_iospace(res, res->start) < 0) + resource_list_destroy_entry(entry); + } + } + + return 0; +} + +static struct acpi_pci_root_ops acpi_pci_root_ops = { + .pci_ops = &pci_root_ops, + .init_info = pci_acpi_root_init_info, + .release_info = pci_acpi_root_release_info, + .prepare_resources = pci_acpi_root_prepare_resources, +}; + /* 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; + int node = acpi_get_node(root->device->handle); + int domain = root->segment; + int busnum = root->secondary.start; + struct acpi_pci_root_info *info; + struct pci_bus *bus; + + if (domain && !pci_domains_supported) { + pr_warn("PCI %04x:%02x: multiple domains not supported.\n", + domain, busnum); + return NULL; + } + + info = kzalloc_node(sizeof(*info), GFP_KERNEL, node); + if (!info) { + dev_err(&root->device->dev, + "pci_bus %04x:%02x: ignored (out of memory)\n", + domain, busnum); + return NULL; + } + + bus = acpi_pci_root_create(root, &acpi_pci_root_ops, info, root); + + /* After the PCI-E bus has been walked and all devices discovered, + * configure any settings of the fabric that might be necessary. + */ + if (bus) { + struct pci_bus *child; + + list_for_each_entry(child, &bus->children, node) + pcie_bus_configure_settings(child); + } + + return bus; } #endif |