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authorTomasz Nowicki <tn@semihalf.com>2016-05-30 17:14:17 +0200
committerGraeme Gregory <graeme.gregory@linaro.org>2016-06-07 14:09:23 +0100
commitc14326bc2da4d600935969fc2ced6df6ec47f13f (patch)
tree7fa20cd2d77cd8165cdb1605897e7b49a0f2593f
parentac169620d457d49a057cf55af3d8ed1f747acd61 (diff)
downloadleg-kernel-c14326bc2da4d600935969fc2ced6df6ec47f13f.tar.gz
acpi, pci: Support IO resources when parsing PCI host bridge resources.
Platforms that have memory mapped IO port (such as ARM64) need special handling for PCI I/O resources. For host bridge's resource probing case these resources need to be fixed up with pci_register_io_range/pci_remap_iospace etc. The same I/O resources need to be released after hotplug removal so that it can be re-added back by the pci_remap_iospace function during insertion. As a consequence we unmap I/O resources with pci_unmap_iospace when we release host bridge resources. Signed-off-by: Jayachandran C <jchandra@broadcom.com> Signed-off-by: Sinan Kaya <okaya@codeaurora.org> Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
-rw-r--r--drivers/acpi/pci_root.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index ae3fe4e64203..ee3b728fa7d2 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -720,6 +720,40 @@ next:
}
}
+#ifdef PCI_IOBASE
+static void acpi_pci_root_remap_iospace(struct resource_entry *entry)
+{
+ struct resource *res = entry->res;
+ resource_size_t cpu_addr = res->start;
+ resource_size_t pci_addr = cpu_addr - entry->offset;
+ resource_size_t length = resource_size(res);
+ unsigned long port;
+
+ if (pci_register_io_range(cpu_addr, length))
+ goto err;
+
+ port = pci_address_to_pio(cpu_addr);
+ if (port == (unsigned long)-1)
+ goto err;
+
+ res->start = port;
+ res->end = port + length - 1;
+ entry->offset = port - pci_addr;
+
+ if (pci_remap_iospace(res, cpu_addr) < 0)
+ goto err;
+
+ pr_info("Remapped I/O %pa to %pR\n", &cpu_addr, res);
+ return;
+err:
+ res->flags |= IORESOURCE_DISABLED;
+}
+#else
+static void acpi_pci_root_remap_iospace(struct resource_entry *entry)
+{
+}
+#endif
+
int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info)
{
int ret;
@@ -740,6 +774,9 @@ int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info)
"no IO and memory resources present in _CRS\n");
else {
resource_list_for_each_entry_safe(entry, tmp, list) {
+ if (entry->res->flags & IORESOURCE_IO)
+ acpi_pci_root_remap_iospace(entry);
+
if (entry->res->flags & IORESOURCE_DISABLED)
resource_list_destroy_entry(entry);
else
@@ -811,6 +848,8 @@ static void acpi_pci_root_release_info(struct pci_host_bridge *bridge)
resource_list_for_each_entry(entry, &bridge->windows) {
res = entry->res;
+ if (res->flags & IORESOURCE_IO)
+ pci_unmap_iospace(res);
if (res->parent &&
(res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
release_resource(res);