aboutsummaryrefslogtreecommitdiff
path: root/arch/arm64/kernel/pci.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm64/kernel/pci.c')
-rw-r--r--arch/arm64/kernel/pci.c144
1 files changed, 136 insertions, 8 deletions
diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
index 3c4e308b40a0..3a83c28a790b 100644
--- a/arch/arm64/kernel/pci.c
+++ b/arch/arm64/kernel/pci.c
@@ -17,6 +17,9 @@
#include <linux/mm.h>
#include <linux/of_pci.h>
#include <linux/of_platform.h>
+#include <linux/pci.h>
+#include <linux/pci-acpi.h>
+#include <linux/pci-ecam.h>
#include <linux/slab.h>
/*
@@ -50,11 +53,16 @@ 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 when probing a new device
*/
-int pcibios_add_device(struct pci_dev *dev)
+int pcibios_alloc_irq(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
+ return acpi_pci_irq_enable(dev);
+#endif
return 0;
}
@@ -65,13 +73,21 @@ int pcibios_add_device(struct pci_dev *dev)
int raw_pci_read(unsigned int domain, unsigned int bus,
unsigned int devfn, int reg, int len, u32 *val)
{
- return -ENXIO;
+ struct pci_bus *b = pci_find_bus(domain, bus);
+
+ if (!b)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ return b->ops->read(b, devfn, reg, len, val);
}
int raw_pci_write(unsigned int domain, unsigned int bus,
unsigned int devfn, int reg, int len, u32 val)
{
- return -ENXIO;
+ struct pci_bus *b = pci_find_bus(domain, bus);
+
+ if (!b)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ return b->ops->write(b, devfn, reg, len, val);
}
#ifdef CONFIG_NUMA
@@ -85,10 +101,122 @@ EXPORT_SYMBOL(pcibus_to_node);
#endif
#ifdef CONFIG_ACPI
-/* Root bridge scanning */
+
+struct acpi_pci_generic_root_info {
+ struct acpi_pci_root_info common;
+ struct pci_config_window *cfg; /* config space mapping */
+};
+
+int acpi_pci_bus_domain_nr(struct pci_bus *bus)
+{
+ struct pci_config_window *cfg = bus->sysdata;
+ struct acpi_device *adev = to_acpi_device(cfg->parent);
+ struct acpi_pci_root *root = acpi_driver_data(adev);
+
+ return root->segment;
+}
+
+int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
+{
+ if (!acpi_disabled) {
+ struct pci_config_window *cfg = bridge->bus->sysdata;
+ struct acpi_device *adev = to_acpi_device(cfg->parent);
+ ACPI_COMPANION_SET(&bridge->dev, adev);
+ }
+
+ return 0;
+}
+
+/*
+ * Lookup the bus range for the domain in MCFG, and set up config space
+ * mapping.
+ */
+static int pci_acpi_setup_ecam_mapping(struct acpi_pci_root *root,
+ struct acpi_pci_generic_root_info *ri)
+{
+ struct resource *bus_res = &root->secondary;
+ u16 seg = root->segment;
+ struct pci_config_window *cfg;
+ struct resource cfgres;
+ unsigned int bsz;
+ int err;
+ struct pci_ecam_ops *ops;
+
+ err = pci_mcfg_lookup(root);
+ if (err) {
+ pr_err("%04x:%pR MCFG region not found\n", seg, bus_res);
+ return err;
+ }
+
+ ops = pci_mcfg_get_ops(root);
+ bsz = 1 << ops->bus_shift;
+ cfgres.start = root->mcfg_addr + bus_res->start * bsz;
+ cfgres.end = cfgres.start + resource_size(bus_res) * bsz - 1;
+ cfgres.flags = IORESOURCE_MEM;
+ cfg = pci_ecam_create(&root->device->dev, &cfgres, bus_res, ops);
+ if (IS_ERR(cfg)) {
+ pr_err("%04x:%pR error %ld mapping CAM\n", seg, bus_res,
+ PTR_ERR(cfg));
+ return PTR_ERR(cfg);
+ }
+
+ ri->cfg = cfg;
+ return 0;
+}
+
+/* release_info: free resrouces allocated by init_info */
+static void pci_acpi_generic_release_info(struct acpi_pci_root_info *ci)
+{
+ struct acpi_pci_generic_root_info *ri;
+
+ ri = container_of(ci, struct acpi_pci_generic_root_info, common);
+ pci_ecam_free(ri->cfg);
+ kfree(ri);
+}
+
+static struct acpi_pci_root_ops acpi_pci_root_ops = {
+ .release_info = pci_acpi_generic_release_info,
+};
+
+/* Interface called from ACPI code to setup PCI host controller */
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);
+ struct acpi_pci_generic_root_info *ri;
+ struct pci_bus *bus, *child;
+ int err;
+
+ ri = kzalloc_node(sizeof(*ri), GFP_KERNEL, node);
+ if (!ri)
+ return NULL;
+
+ err = pci_acpi_setup_ecam_mapping(root, ri);
+ if (err)
+ return NULL;
+
+ acpi_pci_root_ops.pci_ops = &ri->cfg->ops->pci_ops;
+ bus = acpi_pci_root_create(root, &acpi_pci_root_ops, &ri->common,
+ ri->cfg);
+ if (!bus)
+ return NULL;
+
+ pci_bus_size_bridges(bus);
+ pci_bus_assign_resources(bus);
+
+ list_for_each_entry(child, &bus->children, node)
+ pcie_bus_configure_settings(child);
+
+ return bus;
+}
+
+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);
+}
+
#endif