soc/intel/xeon_sp: Add SAD PCI driver

Get rid of some helper functions by properly using a pci_driver.

Configure SAD if necessary and lock SAD if necessary in the newly added
SAD PCI driver. This allows to drop lock_pam0123(), unlock_pam_regions()
and socket0_get_ubox_busno().

- Fixes SAD instance on secondary sockets not decoding the C-F segments
  as DRAM, which would prevent those sockets to access the ACPI/SMBIOS
  table anchor
- Adds PCI multi segment support
  (SKX and CPX only, other were working properly already)
- Moves locking of PAM0123_CSR and PAM456_CSR from SoC to driver code

Change-Id: I167b6ce48631fe3f97359ee33704f52ca854dbd1
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/84794
Reviewed-by: Shuo Liu <shuo.liu@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 0 insertions, 2 deletions

diff --git a/src/soc/intel/xeon_sp/skx/include/soc/soc_util.h b/src/soc/intel/xeon_sp/skx/include/soc/soc_util.h
index b8c000e130..4345e4646e 100644
--- a/src/soc/intel/xeon_sp/skx/include/soc/soc_util.h
+++ b/src/soc/intel/xeon_sp/skx/include/soc/soc_util.h
@@ -13,8 +13,6 @@ void config_reset_cpl3_csrs(void);
 
 const struct SystemMemoryMapHob *get_system_memory_map(void);
 
-uint8_t socket0_get_ubox_busno(const uint8_t stack);
-
 int soc_get_stack_for_port(int port);
 uint8_t get_cxl_node_count(void);