intel/xeon_sp, mb/ocp/deltalake: Rework get_stack_busnos()

- Return the busno based on the stack number.
- Replace pci_mmio_read_config32 with pci_io_read_config32 to get the
  register value before mapping the MMIOCFG space.
- Remove the plural `s` as the function now provides one bus number.

Change-Id: I6e78e31b8ab89b1bdcfdeffae2e193e698385186
Signed-off-by: Maxim Polyakov <max.senia.poliak@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49457
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Lance Zhao
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/soc/intel/xeon_sp/include/soc/util.h b/src/soc/intel/xeon_sp/include/soc/util.h
index 2637017c89a9..8ff54fc1cbd6 100644
--- a/src/soc/intel/xeon_sp/include/soc/util.h
+++ b/src/soc/intel/xeon_sp/include/soc/util.h
@@ -8,7 +8,7 @@
 
 void get_cpubusnos(uint32_t *bus0, uint32_t *bus1, uint32_t *bus2, uint32_t *bus3);
 void unlock_pam_regions(void);
-void get_stack_busnos(uint32_t *bus);
+uint8_t get_stack_busno(const uint8_t stack);
 msr_t read_msr_ppin(void);
 int get_threads_per_package(void);
 int get_platform_thread_count(void);