soc/intel/tigerlake: Add some helper macros for accessing TCSS DMA de…

…vices

Change-Id: I6289d2049fbbb6bb532be3d9e2355c563ec98d1b
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47410
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>

src/soc/intel/tigerlake/include/soc/pci_devs.h

@@ -50,10 +50,12 @@
 #define  SA_DEV_TBT3		PCI_DEV(0, SA_DEV_SLOT_TBT, 3)
 
 #define SA_DEV_SLOT_TCSS	0x0d
+#define NUM_TCSS_DMA_FUNCTIONS	2
+#define  SA_DEVFN_TCSS_DMA(x)	PCI_DEVFN(SA_DEV_SLOT_TCSS, ((x) + 2))
 #define  SA_DEVFN_TCSS_XHCI	PCI_DEVFN(SA_DEV_SLOT_TCSS, 0)
 #define  SA_DEVFN_TCSS_XDCI	PCI_DEVFN(SA_DEV_SLOT_TCSS, 1)
-#define  SA_DEVFN_TCSS_DMA0	PCI_DEVFN(SA_DEV_SLOT_TCSS, 2)
-#define  SA_DEVFN_TCSS_DMA1	PCI_DEVFN(SA_DEV_SLOT_TCSS, 3)
+#define  SA_DEVFN_TCSS_DMA0	SA_DEVFN_TCSS_DMA(0)
+#define  SA_DEVFN_TCSS_DMA1	SA_DEVFN_TCSS_DMA(1)
 #define  SA_DEV_TCSS_XHCI	PCI_DEV(0, SA_DEV_SLOT_TCSS, 0)
 #define  SA_DEV_TCSS_XDCI	PCI_DEV(0, SA_DEV_SLOT_TCSS, 1)
 #define  SA_DEV_TCSS_DMA0	PCI_DEV(0, SA_DEV_SLOT_TCSS, 2)