From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- arch/ia64/kernel/acpi-ext.c | 101 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 101 insertions(+) create mode 100644 arch/ia64/kernel/acpi-ext.c (limited to 'arch/ia64/kernel/acpi-ext.c') diff --git a/arch/ia64/kernel/acpi-ext.c b/arch/ia64/kernel/acpi-ext.c new file mode 100644 index 000000000..42cd21480 --- /dev/null +++ b/arch/ia64/kernel/acpi-ext.c @@ -0,0 +1,101 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * (c) Copyright 2003, 2006 Hewlett-Packard Development Company, L.P. + * Alex Williamson + * Bjorn Helgaas + */ + +#include +#include +#include +#include + +#include + +/* + * Device CSRs that do not appear in PCI config space should be described + * via ACPI. This would normally be done with Address Space Descriptors + * marked as "consumer-only," but old versions of Windows and Linux ignore + * the producer/consumer flag, so HP invented a vendor-defined resource to + * describe the location and size of CSR space. + */ + +struct acpi_vendor_uuid hp_ccsr_uuid = { + .subtype = 2, + .data = { 0xf9, 0xad, 0xe9, 0x69, 0x4f, 0x92, 0x5f, 0xab, 0xf6, 0x4a, + 0x24, 0xd2, 0x01, 0x37, 0x0e, 0xad }, +}; + +static acpi_status hp_ccsr_locate(acpi_handle obj, u64 *base, u64 *length) +{ + acpi_status status; + struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; + struct acpi_resource *resource; + struct acpi_resource_vendor_typed *vendor; + + status = acpi_get_vendor_resource(obj, METHOD_NAME__CRS, &hp_ccsr_uuid, + &buffer); + + resource = buffer.pointer; + vendor = &resource->data.vendor_typed; + + if (ACPI_FAILURE(status) || vendor->byte_length < 16) { + status = AE_NOT_FOUND; + goto exit; + } + + memcpy(base, vendor->byte_data, sizeof(*base)); + memcpy(length, vendor->byte_data + 8, sizeof(*length)); + + exit: + kfree(buffer.pointer); + return status; +} + +struct csr_space { + u64 base; + u64 length; +}; + +static acpi_status find_csr_space(struct acpi_resource *resource, void *data) +{ + struct csr_space *space = data; + struct acpi_resource_address64 addr; + acpi_status status; + + status = acpi_resource_to_address64(resource, &addr); + if (ACPI_SUCCESS(status) && + addr.resource_type == ACPI_MEMORY_RANGE && + addr.address.address_length && + addr.producer_consumer == ACPI_CONSUMER) { + space->base = addr.address.minimum; + space->length = addr.address.address_length; + return AE_CTRL_TERMINATE; + } + return AE_OK; /* keep looking */ +} + +static acpi_status hp_crs_locate(acpi_handle obj, u64 *base, u64 *length) +{ + struct csr_space space = { 0, 0 }; + + acpi_walk_resources(obj, METHOD_NAME__CRS, find_csr_space, &space); + if (!space.length) + return AE_NOT_FOUND; + + *base = space.base; + *length = space.length; + return AE_OK; +} + +acpi_status hp_acpi_csr_space(acpi_handle obj, u64 *csr_base, u64 *csr_length) +{ + acpi_status status; + + status = hp_ccsr_locate(obj, csr_base, csr_length); + if (ACPI_SUCCESS(status)) + return status; + + return hp_crs_locate(obj, csr_base, csr_length); +} +EXPORT_SYMBOL(hp_acpi_csr_space); -- cgit v1.2.3