ntb: Adding Skylake Xeon NTB support

The Skylake Xeon NTB hardware has made some changes to the register name,
offset, and the way doorbells work. Adding driver support for the new
hardware.
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Acked-by: Allen Hubbe <Allen.Hubbe@dell.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>

drivers/ntb/hw/intel/ntb_hw_intel.h

@@ -70,6 +70,7 @@
 #define PCI_DEVICE_ID_INTEL_NTB_B2B_BDX	0x6F0D
 #define PCI_DEVICE_ID_INTEL_NTB_PS_BDX	0x6F0E
 #define PCI_DEVICE_ID_INTEL_NTB_SS_BDX	0x6F0F
+#define PCI_DEVICE_ID_INTEL_NTB_B2B_SKX	0x201C
 
 /* Intel Xeon hardware */
 
@@ -150,6 +151,51 @@
 #define XEON_DB_TOTAL_SHIFT		16
 #define XEON_SPAD_COUNT			16
 
+/* Intel Skylake Xeon hardware */
+#define SKX_IMBAR1SZ_OFFSET		0x00d1
+#define SKX_IMBAR2SZ_OFFSET		0x00d5
+#define SKX_EMBAR1SZ_OFFSET		0x00d3
+#define SKX_EMBAR2SZ_OFFSET		0x00d6
+#define SKX_DEVCTRL_OFFSET		0x0098
+#define SKX_DEVSTS_OFFSET		0x009a
+#define SKX_UNCERRSTS_OFFSET		0x014c
+#define SKX_CORERRSTS_OFFSET		0x0158
+#define SKX_LINK_STATUS_OFFSET		0x01a2
+
+#define SKX_NTBCNTL_OFFSET		0x0000
+#define SKX_IMBAR1XBASE_OFFSET		0x0010		/* SBAR2XLAT */
+#define SKX_IMBAR1XLMT_OFFSET		0x0018		/* SBAR2LMT */
+#define SKX_IMBAR2XBASE_OFFSET		0x0020		/* SBAR4XLAT */
+#define SKX_IMBAR2XLMT_OFFSET		0x0028		/* SBAR4LMT */
+#define SKX_IM_INT_STATUS_OFFSET	0x0040
+#define SKX_IM_INT_DISABLE_OFFSET	0x0048
+#define SKX_IM_SPAD_OFFSET		0x0080		/* SPAD */
+#define SKX_USMEMMISS_OFFSET		0x0070
+#define SKX_INTVEC_OFFSET		0x00d0
+#define SKX_IM_DOORBELL_OFFSET		0x0100		/* SDOORBELL0 */
+#define SKX_B2B_SPAD_OFFSET		0x0180		/* B2B SPAD */
+#define SKX_EMBAR0XBASE_OFFSET		0x4008		/* B2B_XLAT */
+#define SKX_EMBAR1XBASE_OFFSET		0x4010		/* PBAR2XLAT */
+#define SKX_EMBAR1XLMT_OFFSET		0x4018		/* PBAR2LMT */
+#define SKX_EMBAR2XBASE_OFFSET		0x4020		/* PBAR4XLAT */
+#define SKX_EMBAR2XLMT_OFFSET		0x4028		/* PBAR4LMT */
+#define SKX_EM_INT_STATUS_OFFSET	0x4040
+#define SKX_EM_INT_DISABLE_OFFSET	0x4048
+#define SKX_EM_SPAD_OFFSET		0x4080		/* remote SPAD */
+#define SKX_EM_DOORBELL_OFFSET		0x4100		/* PDOORBELL0 */
+#define SKX_SPCICMD_OFFSET		0x4504		/* SPCICMD */
+#define SKX_EMBAR0_OFFSET		0x4510		/* SBAR0BASE */
+#define SKX_EMBAR1_OFFSET		0x4518		/* SBAR23BASE */
+#define SKX_EMBAR2_OFFSET		0x4520		/* SBAR45BASE */
+
+#define SKX_DB_COUNT			32
+#define SKX_DB_LINK			32
+#define SKX_DB_LINK_BIT			BIT_ULL(SKX_DB_LINK)
+#define SKX_DB_MSIX_VECTOR_COUNT	33
+#define SKX_DB_MSIX_VECTOR_SHIFT	1
+#define SKX_DB_TOTAL_SHIFT		33
+#define SKX_SPAD_COUNT			16
+
 /* Intel Atom hardware */
 
 #define ATOM_SBAR2XLAT_OFFSET		0x0008
@@ -240,6 +286,7 @@
 #define NTB_HWERR_SDOORBELL_LOCKUP	BIT_ULL(0)
 #define NTB_HWERR_SB01BASE_LOCKUP	BIT_ULL(1)
 #define NTB_HWERR_B2BDOORBELL_BIT14	BIT_ULL(2)
+#define NTB_HWERR_MSIX_VECTOR32_BAD	BIT_ULL(3)
 
 /* flags to indicate unsafe api */
 #define NTB_UNSAFE_DB			BIT_ULL(0)
@@ -263,6 +310,7 @@ struct intel_ntb_reg {
 struct intel_ntb_alt_reg {
 	unsigned long			db_bell;
 	unsigned long			db_mask;
+	unsigned long			db_clear;
 	unsigned long			spad;
 };