diff options
author | Jayachandran C <jchandra@broadcom.com> | 2016-06-10 21:55:12 +0200 |
---|---|---|
committer | Bjorn Helgaas <bhelgaas@google.com> | 2016-06-10 16:00:48 -0500 |
commit | 0a70abb3806295e039f9b2df5321cc3f7c87f4d6 (patch) | |
tree | 1c5a8e24eb3319ae27252121fc772d56e9397ea4 /drivers/acpi | |
parent | 4d3f13845957a87729a324cce8509fad8826ef52 (diff) | |
download | linux-stable-0a70abb3806295e039f9b2df5321cc3f7c87f4d6.tar.gz linux-stable-0a70abb3806295e039f9b2df5321cc3f7c87f4d6.tar.bz2 linux-stable-0a70abb3806295e039f9b2df5321cc3f7c87f4d6.zip |
PCI/ACPI: Support I/O resources when parsing host bridge resources
On platforms with memory-mapped I/O ports, such as ia64 and ARM64, we have
to map the memory region and coordinate it with the arch's I/O port
accessors.
For ia64, we do this in arch code because it supports both dense (1 byte
per I/O port) and sparse (1024 bytes per I/O port) memory mapping. For
arm64, we only support dense mappings, which we can do in the generic code
with pci_register_io_range() and pci_remap_iospace().
Add acpi_pci_root_remap_iospace() to remap dense memory-mapped I/O port
space when adding a bridge, and call pci_unmap_iospace() to release the
space when removing the bridge.
[bhelgaas: changelog, move #ifdef inside acpi_pci_root_remap_iospace()]
Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
[Tomasz: merged in Sinan's patch to unmap IO resources properly, updated changelog]
Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Diffstat (limited to 'drivers/acpi')
-rw-r--r-- | drivers/acpi/pci_root.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index ae3fe4e64203..d144168d4ef9 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -720,6 +720,36 @@ next: } } +static void acpi_pci_root_remap_iospace(struct resource_entry *entry) +{ +#ifdef PCI_IOBASE + 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; +#endif +} + int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info) { int ret; @@ -740,6 +770,9 @@ 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 +844,8 @@ 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); |