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

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <amdblocks/smn.h>
   4 #include <device/pci_ops.h>
   5 #include <soc/pci_devs.h>
   6 #include <types.h>
   7
   8 /* SMN registers accessed indirectly using an index/data pair in D0F00 config space */
   9 #define SMN_INDEX_ADDR          0xb8 /* 32 bit */
  10 #define SMN_DATA_ADDR           0xbc /* 32 bit */
  11
  12 uint32_t smn_read32(uint32_t reg)
  13 {
  14         pci_write_config32(SOC_GNB_DEV, SMN_INDEX_ADDR, reg);
  15         return pci_read_config32(SOC_GNB_DEV, SMN_DATA_ADDR);
  16 }
  17
  18 uint64_t smn_read64(uint32_t reg)
  19 {
  20         return smn_read32(reg) | (uint64_t)smn_read32(reg + 4) << 32;
  21 }
  22
  23 void smn_write32(uint32_t reg, uint32_t val)
  24 {
  25         pci_write_config32(SOC_GNB_DEV, SMN_INDEX_ADDR, reg);
  26         pci_write_config32(SOC_GNB_DEV, SMN_DATA_ADDR, val);
  27 }