src/southbridge/intel/i82801dx/early_init.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <device/smbus_host.h>
   4 #include <device/pci_ops.h>
   5 #include "i82801dx.h"
   6
   7 void i82801dx_early_init(void)
   8 {
   9         const pci_devfn_t dev = PCI_DEV(0, 0x1f, 0);
  10
  11         /* Enable ACPI I/O range decode and ACPI power management. */
  12         pci_write_config32(dev, PMBASE, DEFAULT_PMBASE | 1);
  13         pci_write_config8(dev, ACPI_CNTL, ACPI_EN);
  14
  15         pci_write_config32(dev, GPIO_BASE, GPIOBASE_ADDR | 1);
  16         pci_write_config8(dev, GPIO_CNTL, 0x10);
  17
  18         if (ENV_RAMINIT)
  19                 enable_smbus();
  20 }
  21
  22 void i82801dx_lpc_setup(void)
  23 {
  24         const pci_devfn_t dev = PCI_DEV(0, 0x1f, 0);
  25
  26         /* Decode 0x3F8-0x3FF (COM1) for COMA port, 0x2F8-0x2FF (COM2) for COMB.
  27          * LPT decode defaults to 0x378-0x37F and 0x778-0x77F.
  28          * Floppy decode defaults to 0x3F0-0x3F5, 0x3F7.
  29          * We also need to set the value for LPC I/F Enables Register.
  30          */
  31         pci_write_config8(dev, COM_DEC, 0x10);
  32         pci_write_config16(dev, LPC_EN, 0x300F);
  33 }