src/soc/intel/apollolake/i2c.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <device/device.h>
   4 #include <device/pci_def.h>
   5 #include <drivers/i2c/designware/dw_i2c.h>
   6 #include <soc/pci_devs.h>
   7
   8 /* Convert I2C bus number to PCI device and function */
   9 int dw_i2c_soc_bus_to_devfn(unsigned int bus)
  10 {
  11         if (bus <= 3)
  12                 return PCI_DEVFN(PCH_DEV_SLOT_SIO1, bus);
  13         else if (bus >= 4 && bus <= 7)
  14                 return PCI_DEVFN(PCH_DEV_SLOT_SIO2, (bus - 4));
  15         else
  16                 return -1;
  17 }
  18
  19 /* Convert PCI device and function to I2C bus number */
  20 int dw_i2c_soc_devfn_to_bus(unsigned int devfn)
  21 {
  22         if (PCI_SLOT(devfn) == PCH_DEV_SLOT_SIO1)
  23                 return PCI_FUNC(devfn);
  24         else if (PCI_SLOT(devfn) == PCH_DEV_SLOT_SIO2)
  25                 return PCI_FUNC(devfn) + 4;
  26         else
  27                 return -1;
  28 }