1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2
3 #include <stdint.h>
4 #include <device/pci_ops.h>
5 #include <device/pci.h>
6 #include <device/pci_ids.h>
7 #include "i82371eb.h"
8
enable_pm(void)9 void enable_pm(void)
10 {
11 u8 reg8;
12 u16 reg16;
13
14 /* Get the SMBus/PM device of the 82371AB/EB/MB. */
15 const pci_devfn_t dev = pci_locate_device(PCI_ID(PCI_VID_INTEL,
16 PCI_DID_INTEL_82371AB_SMB_ACPI), 0);
17
18 /* Set the PM I/O base. */
19 pci_write_config32(dev, PMBA, DEFAULT_PMBASE | 1);
20
21 /* Enable access to the PM I/O space. */
22 reg16 = pci_read_config16(dev, PCI_COMMAND);
23 reg16 |= PCI_COMMAND_IO;
24 pci_write_config16(dev, PCI_COMMAND, reg16);
25
26 /* PM I/O Space Enable (PMIOSE). */
27 reg8 = pci_read_config8(dev, PMREGMISC);
28 reg8 |= PMIOSE;
29 pci_write_config8(dev, PMREGMISC, reg8);
30 }
31