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Diffstat (limited to 'src/soc/intel/elkhartlake/p2sb.c')
-rw-r--r--src/soc/intel/elkhartlake/p2sb.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/src/soc/intel/elkhartlake/p2sb.c b/src/soc/intel/elkhartlake/p2sb.c
new file mode 100644
index 0000000000..0ddd007920
--- /dev/null
+++ b/src/soc/intel/elkhartlake/p2sb.c
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <console/console.h>
+#include <intelblocks/p2sb.h>
+
+void p2sb_soc_get_sb_mask(uint32_t *ep_mask, size_t count)
+{
+ uint32_t mask;
+
+ if (count != P2SB_EP_MASK_MAX_REG) {
+ printk(BIOS_ERR, "Unable to program EPMASK registers\n");
+ return;
+ }
+
+ /* Remove the host accessing right to PSF register range.
+ * Set p2sb PCI offset EPMASK5 [29, 28, 27, 26] to disable sideband
+ * access for PCI Root Bridge.
+ */
+ mask = (1 << 29) | (1 << 28) | (1 << 27) | (1 << 26);
+
+ ep_mask[P2SB_EP_MASK_5_REG] = mask;
+
+ /*
+ * Set p2sb PCI offset EPMASK7 [31, 30] to disable Sideband
+ * access for Broadcast and Multicast.
+ */
+ mask = (1 << 31) | (1 << 30);
+
+ ep_mask[P2SB_EP_MASK_7_REG] = mask;
+}