soc/intel/common/systemagent: select CAPID_A, BDSM and BGSM by Kconfig

CAPID_A, BDSM and BGSM registers may not exist on specific platform,
this patch add `HAVE_CAPID_A_REGISTER` and `HAVE_BDSM_BGSM_REGISTER`
to select them.

Change-Id: I4d1197b8b1071aefc2ea1ed2f707d769aabab5e4
Signed-off-by: Yuchi Chen <yuchi.chen@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/84108
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Shuo Liu <shuo.liu@intel.com>

src/soc/intel/common/block/systemagent/Kconfig

@@ -43,4 +43,16 @@ config HAVE_PAM0_REGISTER
 	help
 	  Specify if the SOC has a PAM0 register
 
+config HAVE_CAPID_A_REGISTER
+	bool
+	default y
+	help
+	  Specify if the SOC has the CAPID0_A register that holds DRAM infomations.
+
+config HAVE_BDSM_BGSM_REGISTER
+	bool
+	default y
+	help
+	  Specify if the SOC has BDSM and BGSM registres.
+
 endif

src/soc/intel/common/block/systemagent/systemagent.c

@@ -78,6 +78,9 @@ static void sa_soc_systemagent_init(struct device *dev)
 	if (m == NULL)
 		return;
 
+	if (!CONFIG(HAVE_CAPID_A_REGISTER))
+		return;
+
 	const uint32_t capid0_a = pci_read_config32(dev, CAPID0_A);
 
 	m->ecc_type = sa_get_ecc_type(capid0_a);
@@ -126,7 +129,9 @@ void sa_add_fixed_mmio_resources(struct device *dev, int *resource_cnt,
 static const struct sa_mem_map_descriptor sa_memory_map[MAX_MAP_ENTRIES] = {
 	{ TOUUD, true, "TOUUD" },
 	{ TOLUD, false, "TOLUD" },
+#if CONFIG(HAVE_BDSM_BGSM_REGISTER)
 	{ BGSM, false, "BGSM" },
+#endif
 	{ TSEG, false, "TSEG" },
 };
 

src/soc/intel/common/block/systemagent/systemagent_def.h

@@ -58,7 +58,9 @@
 enum {
 	SA_TOUUD_REG,
 	SA_TOLUD_REG,
+#if CONFIG(HAVE_BDSM_BGSM_REGISTER)
 	SA_BGSM_REG,
+#endif
 	SA_TSEG_REG,
 	/* Must be last. */
 	MAX_MAP_ENTRIES