octeontx2-af: NIX block admin queue init

Initialize NIX admin queue (AQ) i.e alloc memory for
AQ instructions and for the results. All NIX LFs will submit
instructions to AQ to init/write/read RQ/SQ/CQ/RSS contexts
and in case of read, get context from result memory.

Also before configuring/using NIX block calibrate X2P bus
and check if NIX interfaces like CGX and LBK are in active
and working state.

Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/octeontx2/af/Makefile

@@ -7,4 +7,4 @@ obj-$(CONFIG_OCTEONTX2_MBOX) += octeontx2_mbox.o
 obj-$(CONFIG_OCTEONTX2_AF) += octeontx2_af.o
 
 octeontx2_mbox-y := mbox.o
-octeontx2_af-y := cgx.o rvu.o rvu_cgx.o rvu_npa.o
+octeontx2_af-y := cgx.o rvu.o rvu_cgx.o rvu_npa.o rvu_nix.o

drivers/net/ethernet/marvell/octeontx2/af/rvu.c

@@ -566,6 +566,7 @@ static void rvu_free_hw_resources(struct rvu *rvu)
 	u64 cfg;
 
 	rvu_npa_freemem(rvu);
+	rvu_nix_freemem(rvu);
 
 	/* Free block LF bitmaps */
 	for (id = 0; id < BLK_COUNT; id++) {
@@ -774,6 +775,10 @@ static int rvu_setup_hw_resources(struct rvu *rvu)
 	if (err)
 		return err;
 
+	err = rvu_nix_init(rvu);
+	if (err)
+		return err;
+
 	return 0;
 }
 

drivers/net/ethernet/marvell/octeontx2/af/rvu.h

@@ -226,4 +226,8 @@ int rvu_mbox_handler_NPA_LF_ALLOC(struct rvu *rvu,
 				  struct npa_lf_alloc_rsp *rsp);
 int rvu_mbox_handler_NPA_LF_FREE(struct rvu *rvu, struct msg_req *req,
 				 struct msg_rsp *rsp);
+
+/* NIX APIs */
+int rvu_nix_init(struct rvu *rvu);
+void rvu_nix_freemem(struct rvu *rvu);
 #endif /* RVU_H */

drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c

@@ -0,0 +1,138 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Marvell OcteonTx2 RVU Admin Function driver
+ *
+ * Copyright (C) 2018 Marvell International Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/pci.h>
+
+#include "rvu_struct.h"
+#include "rvu_reg.h"
+#include "rvu.h"
+#include "cgx.h"
+
+static int nix_calibrate_x2p(struct rvu *rvu, int blkaddr)
+{
+	int idx, err;
+	u64 status;
+
+	/* Start X2P bus calibration */
+	rvu_write64(rvu, blkaddr, NIX_AF_CFG,
+		    rvu_read64(rvu, blkaddr, NIX_AF_CFG) | BIT_ULL(9));
+	/* Wait for calibration to complete */
+	err = rvu_poll_reg(rvu, blkaddr,
+			   NIX_AF_STATUS, BIT_ULL(10), false);
+	if (err) {
+		dev_err(rvu->dev, "NIX X2P bus calibration failed\n");
+		return err;
+	}
+
+	status = rvu_read64(rvu, blkaddr, NIX_AF_STATUS);
+	/* Check if CGX devices are ready */
+	for (idx = 0; idx < cgx_get_cgx_cnt(); idx++) {
+		if (status & (BIT_ULL(16 + idx)))
+			continue;
+		dev_err(rvu->dev,
+			"CGX%d didn't respond to NIX X2P calibration\n", idx);
+		err = -EBUSY;
+	}
+
+	/* Check if LBK is ready */
+	if (!(status & BIT_ULL(19))) {
+		dev_err(rvu->dev,
+			"LBK didn't respond to NIX X2P calibration\n");
+		err = -EBUSY;
+	}
+
+	/* Clear 'calibrate_x2p' bit */
+	rvu_write64(rvu, blkaddr, NIX_AF_CFG,
+		    rvu_read64(rvu, blkaddr, NIX_AF_CFG) & ~BIT_ULL(9));
+	if (err || (status & 0x3FFULL))
+		dev_err(rvu->dev,
+			"NIX X2P calibration failed, status 0x%llx\n", status);
+	if (err)
+		return err;
+	return 0;
+}
+
+static int nix_aq_init(struct rvu *rvu, struct rvu_block *block)
+{
+	u64 cfg;
+	int err;
+
+	/* Set admin queue endianness */
+	cfg = rvu_read64(rvu, block->addr, NIX_AF_CFG);
+#ifdef __BIG_ENDIAN
+	cfg |= BIT_ULL(1);
+	rvu_write64(rvu, block->addr, NIX_AF_CFG, cfg);
+#else
+	cfg &= ~BIT_ULL(1);
+	rvu_write64(rvu, block->addr, NIX_AF_CFG, cfg);
+#endif
+
+	/* Do not bypass NDC cache */
+	cfg = rvu_read64(rvu, block->addr, NIX_AF_NDC_CFG);
+	cfg &= ~0x3FFEULL;
+	rvu_write64(rvu, block->addr, NIX_AF_NDC_CFG, cfg);
+
+	/* Result structure can be followed by RQ/SQ/CQ context at
+	 * RES + 128bytes and a write mask at RES + 256 bytes, depending on
+	 * operation type. Alloc sufficient result memory for all operations.
+	 */
+	err = rvu_aq_alloc(rvu, &block->aq,
+			   Q_COUNT(AQ_SIZE), sizeof(struct nix_aq_inst_s),
+			   ALIGN(sizeof(struct nix_aq_res_s), 128) + 256);
+	if (err)
+		return err;
+
+	rvu_write64(rvu, block->addr, NIX_AF_AQ_CFG, AQ_SIZE);
+	rvu_write64(rvu, block->addr,
+		    NIX_AF_AQ_BASE, (u64)block->aq->inst->iova);
+	return 0;
+}
+
+int rvu_nix_init(struct rvu *rvu)
+{
+	struct rvu_hwinfo *hw = rvu->hw;
+	struct rvu_block *block;
+	int blkaddr, err;
+
+	blkaddr = rvu_get_blkaddr(rvu, BLKTYPE_NIX, 0);
+	if (blkaddr < 0)
+		return 0;
+	block = &hw->block[blkaddr];
+
+	/* Calibrate X2P bus to check if CGX/LBK links are fine */
+	err = nix_calibrate_x2p(rvu, blkaddr);
+	if (err)
+		return err;
+
+	/* Initialize admin queue */
+	err = nix_aq_init(rvu, block);
+	if (err)
+		return err;
+
+	/* Restore CINT timer delay to HW reset values */
+	rvu_write64(rvu, blkaddr, NIX_AF_CINT_DELAY, 0x0ULL);
+
+	return 0;
+}
+
+void rvu_nix_freemem(struct rvu *rvu)
+{
+	struct rvu_hwinfo *hw = rvu->hw;
+	struct rvu_block *block;
+	int blkaddr;
+
+	blkaddr = rvu_get_blkaddr(rvu, BLKTYPE_NIX, 0);
+	if (blkaddr < 0)
+		return;
+
+	block = &hw->block[blkaddr];
+	rvu_aq_free(rvu, block->aq);
+}

drivers/net/ethernet/marvell/octeontx2/af/rvu_struct.h

@@ -354,4 +354,76 @@ struct npa_pool_s {
 	u64 reserved_896_959;		/* W14 */
 	u64 reserved_960_1023;		/* W15 */
 };
+
+/* NIX admin queue completion status */
+enum nix_aq_comp {
+	NIX_AQ_COMP_NOTDONE        = 0x0,
+	NIX_AQ_COMP_GOOD           = 0x1,
+	NIX_AQ_COMP_SWERR          = 0x2,
+	NIX_AQ_COMP_CTX_POISON     = 0x3,
+	NIX_AQ_COMP_CTX_FAULT      = 0x4,
+	NIX_AQ_COMP_LOCKERR        = 0x5,
+	NIX_AQ_COMP_SQB_ALLOC_FAIL = 0x6,
+};
+
+/* NIX admin queue context types */
+enum nix_aq_ctype {
+	NIX_AQ_CTYPE_RQ   = 0x0,
+	NIX_AQ_CTYPE_SQ   = 0x1,
+	NIX_AQ_CTYPE_CQ   = 0x2,
+	NIX_AQ_CTYPE_MCE  = 0x3,
+	NIX_AQ_CTYPE_RSS  = 0x4,
+	NIX_AQ_CTYPE_DYNO = 0x5,
+};
+
+/* NIX admin queue instruction opcodes */
+enum nix_aq_instop {
+	NIX_AQ_INSTOP_NOP    = 0x0,
+	NIX_AQ_INSTOP_INIT   = 0x1,
+	NIX_AQ_INSTOP_WRITE  = 0x2,
+	NIX_AQ_INSTOP_READ   = 0x3,
+	NIX_AQ_INSTOP_LOCK   = 0x4,
+	NIX_AQ_INSTOP_UNLOCK = 0x5,
+};
+
+/* NIX admin queue instruction structure */
+struct nix_aq_inst_s {
+#if defined(__BIG_ENDIAN_BITFIELD)
+	u64 doneint		: 1;	/* W0 */
+	u64 reserved_44_62	: 19;
+	u64 cindex		: 20;
+	u64 reserved_15_23	: 9;
+	u64 lf			: 7;
+	u64 ctype		: 4;
+	u64 op			: 4;
+#else
+	u64 op			: 4;
+	u64 ctype		: 4;
+	u64 lf			: 7;
+	u64 reserved_15_23	: 9;
+	u64 cindex		: 20;
+	u64 reserved_44_62	: 19;
+	u64 doneint		: 1;
+#endif
+	u64 res_addr;			/* W1 */
+};
+
+/* NIX admin queue result structure */
+struct nix_aq_res_s {
+#if defined(__BIG_ENDIAN_BITFIELD)
+	u64 reserved_17_63	: 47;	/* W0 */
+	u64 doneint		: 1;
+	u64 compcode		: 8;
+	u64 ctype		: 4;
+	u64 op			: 4;
+#else
+	u64 op			: 4;
+	u64 ctype		: 4;
+	u64 compcode		: 8;
+	u64 doneint		: 1;
+	u64 reserved_17_63	: 47;
+#endif
+	u64 reserved_64_127;		/* W1 */
+};
+
 #endif /* RVU_STRUCT_H */