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1 | /* |
2 | * PCIe Port Native Services Support, ACPI-Related Part | |
3 | * | |
4 | * Copyright (C) 2010 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc. | |
5 | * | |
6 | * This file is subject to the terms and conditions of the GNU General Public | |
7 | * License V2. See the file "COPYING" in the main directory of this archive | |
8 | * for more details. | |
9 | */ | |
10 | ||
11 | #include <linux/pci.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/acpi.h> | |
15 | #include <linux/pci-acpi.h> | |
16 | #include <linux/pcieport_if.h> | |
17 | ||
18 | #include "aer/aerdrv.h" | |
19 | #include "../pci.h" | |
139f9251 | 20 | #include "portdrv.h" |
28eb5f27 RW |
21 | |
22 | /** | |
23 | * pcie_port_acpi_setup - Request the BIOS to release control of PCIe services. | |
24 | * @port: PCIe Port service for a root port or event collector. | |
25 | * @srv_mask: Bit mask of services that can be enabled for @port. | |
26 | * | |
27 | * Invoked when @port is identified as a PCIe port device. To avoid conflicts | |
28 | * with the BIOS PCIe port native services support requires the BIOS to yield | |
29 | * control of these services to the kernel. The mask of services that the BIOS | |
30 | * allows to be enabled for @port is written to @srv_mask. | |
31 | * | |
32 | * NOTE: It turns out that we cannot do that for individual port services | |
33 | * separately, because that would make some systems work incorrectly. | |
34 | */ | |
35 | int pcie_port_acpi_setup(struct pci_dev *port, int *srv_mask) | |
36 | { | |
415e12b2 | 37 | struct acpi_pci_root *root; |
28eb5f27 RW |
38 | acpi_handle handle; |
39 | u32 flags; | |
40 | ||
41 | if (acpi_pci_disabled) | |
42 | return 0; | |
43 | ||
44 | handle = acpi_find_root_bridge_handle(port); | |
45 | if (!handle) | |
46 | return -EINVAL; | |
47 | ||
415e12b2 RW |
48 | root = acpi_pci_find_root(handle); |
49 | if (!root) | |
28eb5f27 | 50 | return -ENODEV; |
28eb5f27 | 51 | |
415e12b2 | 52 | flags = root->osc_control_set; |
28eb5f27 RW |
53 | |
54 | *srv_mask = PCIE_PORT_SERVICE_VC; | |
55 | if (flags & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL) | |
56 | *srv_mask |= PCIE_PORT_SERVICE_HP; | |
57 | if (flags & OSC_PCI_EXPRESS_PME_CONTROL) | |
58 | *srv_mask |= PCIE_PORT_SERVICE_PME; | |
59 | if (flags & OSC_PCI_EXPRESS_AER_CONTROL) | |
60 | *srv_mask |= PCIE_PORT_SERVICE_AER; | |
61 | ||
62 | return 0; | |
63 | } |