mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 13:43:55 +08:00
104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
/*
|
|
* (c) Copyright 2003, 2006 Hewlett-Packard Development Company, L.P.
|
|
* Alex Williamson <alex.williamson@hp.com>
|
|
* Bjorn Helgaas <bjorn.helgaas@hp.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <linux/acpi.h>
|
|
|
|
#include <asm/acpi-ext.h>
|
|
|
|
/*
|
|
* 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_length &&
|
|
addr.producer_consumer == ACPI_CONSUMER) {
|
|
space->base = addr.minimum;
|
|
space->length = addr.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);
|