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 <device/smbus_host.h>
8 #include "i82371eb.h"
9
i82371eb_early_init(void)10 void i82371eb_early_init(void)
11 {
12 enable_smbus();
13 enable_pm();
14 }
15
smbus_base(void)16 uintptr_t smbus_base(void)
17 {
18 return SMBUS_IO_BASE;
19 }
20
smbus_enable_iobar(uintptr_t base)21 int smbus_enable_iobar(uintptr_t base)
22 {
23 u8 reg8;
24 u16 reg16;
25
26 /* Get the SMBus/PM device of the 82371AB/EB/MB. */
27 const pci_devfn_t dev = pci_locate_device(PCI_ID(PCI_VID_INTEL,
28 PCI_DID_INTEL_82371AB_SMB_ACPI), 0);
29
30 /* Set the SMBus I/O base. */
31 pci_write_config32(dev, SMBBA, base | 1);
32
33 /* Enable the SMBus controller host interface. */
34 reg8 = pci_read_config8(dev, SMBHSTCFG);
35 reg8 |= SMB_HST_EN;
36 pci_write_config8(dev, SMBHSTCFG, reg8);
37
38 /* Enable access to the SMBus I/O space. */
39 reg16 = pci_read_config16(dev, PCI_COMMAND);
40 reg16 |= PCI_COMMAND_IO;
41 pci_write_config16(dev, PCI_COMMAND, reg16);
42
43 return 0;
44 }
45