src/soc/amd/common/block/aoac/aoac.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <stdint.h>
   4 #include <amdblocks/acpimmio.h>
   5 #include <amdblocks/aoac.h>
   6
   7 /* This initiates the power on sequence, but doesn't wait for the device to be powered on. */
   8 void power_on_aoac_device(unsigned int dev)
   9 {
  10         uint8_t byte = aoac_read8(AOAC_DEV_D3_CTL(dev));
  11         byte |= FCH_AOAC_PWR_ON_DEV;
  12         byte &= ~FCH_AOAC_TARGET_DEVICE_STATE;
  13         byte |= FCH_AOAC_D0_INITIALIZED;
  14         aoac_write8(AOAC_DEV_D3_CTL(dev), byte);
  15 }
  16
  17 void power_off_aoac_device(unsigned int dev)
  18 {
  19         uint8_t byte = aoac_read8(AOAC_DEV_D3_CTL(dev));
  20         byte &= ~FCH_AOAC_PWR_ON_DEV;
  21         aoac_write8(AOAC_DEV_D3_CTL(dev), byte);
  22 }
  23
  24 bool is_aoac_device_enabled(unsigned int dev)
  25 {
  26         uint8_t byte = aoac_read8(AOAC_DEV_D3_STATE(dev));
  27         byte &= (FCH_AOAC_PWR_RST_STATE | FCH_AOAC_REF_CLK_OK_STATE);
  28         if (byte == (FCH_AOAC_PWR_RST_STATE | FCH_AOAC_REF_CLK_OK_STATE))
  29                 return true;
  30         else
  31                 return false;
  32 }