nfp: add CPP access core

Command Push Pull is the name of NFP's network on a chip.
PCIe PF can access the interconnect through a number of mappings
controlled via Base Access Registers.  BARs allow the PF to issue
pretty much any command or address any memory on the chip.

Add appropriate logic and a handful of helper for simple operations
like reading scalars from memories.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/netronome/nfp/Makefile

@@ -1,6 +1,10 @@
 obj-$(CONFIG_NFP)	+= nfp.o
 
 nfp-objs := \
+	    nfpcore/nfp6000_pcie.o \
+	    nfpcore/nfp_cppcore.o \
+	    nfpcore/nfp_cpplib.o \
+	    nfpcore/nfp_target.o \
 	    nfp_main.o \
 	    nfp_net_common.o \
 	    nfp_net_ethtool.o \

drivers/net/ethernet/netronome/nfp/nfpcore/nfp6000/nfp6000.h

@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2015-2017 Netronome Systems, Inc.
+ *
+ * This software is dual licensed under the GNU General License Version 2,
+ * June 1991 as shown in the file COPYING in the top-level directory of this
+ * source tree or the BSD 2-Clause License provided below.  You have the
+ * option to license this software under the complete terms of either license.
+ *
+ * The BSD 2-Clause License:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      1. Redistributions of source code must retain the above
+ *         copyright notice, this list of conditions and the following
+ *         disclaimer.
+ *
+ *      2. Redistributions in binary form must reproduce the above
+ *         copyright notice, this list of conditions and the following
+ *         disclaimer in the documentation and/or other materials
+ *         provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef NFP6000_NFP6000_H
+#define NFP6000_NFP6000_H
+
+#include <linux/errno.h>
+#include <linux/types.h>
+
+/* CPP Target IDs */
+#define NFP_CPP_TARGET_INVALID          0
+#define NFP_CPP_TARGET_NBI              1
+#define NFP_CPP_TARGET_QDR              2
+#define NFP_CPP_TARGET_ILA              6
+#define NFP_CPP_TARGET_MU               7
+#define NFP_CPP_TARGET_PCIE             9
+#define NFP_CPP_TARGET_ARM              10
+#define NFP_CPP_TARGET_CRYPTO           12
+#define NFP_CPP_TARGET_ISLAND_XPB       14      /* Shared with CAP */
+#define NFP_CPP_TARGET_ISLAND_CAP       14      /* Shared with XPB */
+#define NFP_CPP_TARGET_CT_XPB           14
+#define NFP_CPP_TARGET_LOCAL_SCRATCH    15
+#define NFP_CPP_TARGET_CLS              NFP_CPP_TARGET_LOCAL_SCRATCH
+
+#define NFP_ISL_EMEM0			24
+
+#define NFP_MU_ADDR_ACCESS_TYPE_MASK	3ULL
+#define NFP_MU_ADDR_ACCESS_TYPE_DIRECT	2ULL
+
+#define PUSHPULL(_pull, _push)		((_pull) << 4 | (_push) << 0)
+#define PUSH_WIDTH(_pushpull)		pushpull_width((_pushpull) >> 0)
+#define PULL_WIDTH(_pushpull)		pushpull_width((_pushpull) >> 4)
+
+static inline int pushpull_width(int pp)
+{
+	pp &= 0xf;
+
+	if (pp == 0)
+		return -EINVAL;
+	return 2 << pp;
+}
+
+static inline int nfp_cppat_mu_locality_lsb(int mode, bool addr40)
+{
+	switch (mode) {
+	case 0 ... 3:
+		return addr40 ? 38 : 30;
+	default:
+		return -EINVAL;
+	}
+}
+
+int nfp_target_pushpull(u32 cpp_id, u64 address);
+int nfp_target_cpp(u32 cpp_island_id, u64 cpp_island_address,
+		   u32 *cpp_target_id, u64 *cpp_target_address,
+		   const u32 *imb_table);
+
+#endif /* NFP6000_NFP6000_H */

drivers/net/ethernet/netronome/nfp/nfpcore/nfp6000/nfp_xpb.h

@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2015-2017 Netronome Systems, Inc.
+ *
+ * This software is dual licensed under the GNU General License Version 2,
+ * June 1991 as shown in the file COPYING in the top-level directory of this
+ * source tree or the BSD 2-Clause License provided below.  You have the
+ * option to license this software under the complete terms of either license.
+ *
+ * The BSD 2-Clause License:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      1. Redistributions of source code must retain the above
+ *         copyright notice, this list of conditions and the following
+ *         disclaimer.
+ *
+ *      2. Redistributions in binary form must reproduce the above
+ *         copyright notice, this list of conditions and the following
+ *         disclaimer in the documentation and/or other materials
+ *         provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+/*
+ * nfp_xpb.h
+ * Author: Jason McMullan <jason.mcmullan@netronome.com>
+ */
+
+#ifndef NFP6000_XPB_H
+#define NFP6000_XPB_H
+
+/* For use with NFP6000 Databook "XPB Addressing" section
+ */
+#define NFP_XPB_OVERLAY(island)  (((island) & 0x3f) << 24)
+
+#define NFP_XPB_ISLAND(island)   (NFP_XPB_OVERLAY(island) + 0x60000)
+
+#define NFP_XPB_ISLAND_of(offset) (((offset) >> 24) & 0x3F)
+
+/* For use with NFP6000 Databook "XPB Island and Device IDs" chapter
+ */
+#define NFP_XPB_DEVICE(island, slave, device) \
+	(NFP_XPB_OVERLAY(island) | \
+	 (((slave) & 3) << 22) | \
+	 (((device) & 0x3f) << 16))
+
+#endif /* NFP6000_XPB_H */