src/soc/intel/common/block/smbus/smbus_early.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <arch/io.h>
   4 #include <device/pci_def.h>
   5 #include <device/pci_ops.h>
   6 #include <device/smbus_host.h>
   7 #include <device/pci_type.h>
   8 #include <intelblocks/smbus.h>
   9 #include <soc/pci_devs.h>
  10 #include <stdint.h>
  11
  12 #include "smbuslib.h"
  13
  14 void smbus_common_init(void)
  15 {
  16         const pci_devfn_t dev = PCH_DEV_SMBUS;
  17
  18         /* Set SMBus I/O base address */
  19         pci_write_config32(dev, PCI_BASE_ADDRESS_4, SMBUS_IO_BASE);
  20         /* Set SMBus enable */
  21         pci_write_config8(dev, HOSTC, HST_EN);
  22         /* Enable I/O access */
  23         pci_write_config16(dev, PCI_COMMAND, PCI_COMMAND_IO);
  24         /* Disable interrupts */
  25         outb(0, SMBUS_IO_BASE + SMBHSTCTL);
  26         /* Clear errors */
  27         outb(0xff, SMBUS_IO_BASE + SMBHSTSTAT);
  28 }
  29
  30 uintptr_t smbus_base(void)
  31 {
  32         return SMBUS_IO_BASE;
  33 }