Revert "soc/intel/cannonlake: Remove DMA support for PTT"

This reverts commit d5018a8f78.

src/soc/intel/cannonlake/include/soc/iomap.h

@@ -67,6 +67,10 @@
 
 #define HECI1_BASE_ADDRESS	0xfeda2000
 
+/* PTT registers */
+#define PTT_TXT_BASE_ADDRESS	0xfed30800
+#define PTT_PRESENT		0x00070000
+
 #define VTD_BASE_ADDRESS	0xFED90000
 #define VTD_BASE_SIZE		0x00004000
 /*

src/soc/intel/cannonlake/memmap.c

@@ -83,6 +83,22 @@ int smm_subregion(int sub, void **start, size_t *size)
 	return 0;
 }
 
+static bool is_ptt_enable(void)
+{
+	if ((read32((void *)PTT_TXT_BASE_ADDRESS) & PTT_PRESENT) ==
+			PTT_PRESENT)
+		return true;
+
+	return false;
+}
+
+/* Calculate PTT size */
+static size_t get_ptt_size(void)
+{
+	/* Allocate 4KB for PTT if enabled */
+	return is_ptt_enable() ? 4*KiB : 0;
+}
+
 /* Calculate ME Stolen size */
 static size_t get_imr_size(void)
 {
@@ -176,6 +192,9 @@ static size_t calculate_reserved_mem_size(uintptr_t dram_base,
 	/* Get Tracehub size */
 	reserve_mem_base -= get_imr_size();
 
+	/* Get PTT size */
+	reserve_mem_base -= get_ptt_size();
+
 	/* Traditional Area Size */
 	reserve_mem_size = dram_base - reserve_mem_base;