octeontx2-af: Add support for CGX link management

CGX LMAC initialization, link status polling etc is done
by low level secure firmware. For link management this patch
adds a interface or communication mechanism between firmware
and this kernel CGX driver.

- Firmware interface specification is defined in cgx_fw_if.h.
- Support to send/receive commands/events to/form firmware.
- events/commands implemented
  * link up
  * link down
  * reading firmware version

Signed-off-by: Linu Cherian <lcherian@marvell.com>
Signed-off-by: Nithya Mani <nmani@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 97 insertions, 0 deletions

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c
new file mode 100644
index 000000000000..bf8150727e24
--- /dev/null
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c
@@ -0,0 +1,97 @@
+// 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/types.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+
+#include "rvu.h"
+#include "cgx.h"
+
+static inline u8 cgxlmac_id_to_bmap(u8 cgx_id, u8 lmac_id)
+{
+	return ((cgx_id & 0xF) << 4) | (lmac_id & 0xF);
+}
+
+static void *rvu_cgx_pdata(u8 cgx_id, struct rvu *rvu)
+{
+	if (cgx_id >= rvu->cgx_cnt)
+		return NULL;
+
+	return rvu->cgx_idmap[cgx_id];
+}
+
+static int rvu_map_cgx_lmac_pf(struct rvu *rvu)
+{
+	int cgx_cnt = rvu->cgx_cnt;
+	int cgx, lmac_cnt, lmac;
+	int pf = PF_CGXMAP_BASE;
+	int size;
+
+	if (!cgx_cnt)
+		return 0;
+
+	if (cgx_cnt > 0xF || MAX_LMAC_PER_CGX > 0xF)
+		return -EINVAL;
+
+	/* Alloc map table
+	 * An additional entry is required since PF id starts from 1 and
+	 * hence entry at offset 0 is invalid.
+	 */
+	size = (cgx_cnt * MAX_LMAC_PER_CGX + 1) * sizeof(u8);
+	rvu->pf2cgxlmac_map = devm_kzalloc(rvu->dev, size, GFP_KERNEL);
+	if (!rvu->pf2cgxlmac_map)
+		return -ENOMEM;
+
+	/* Initialize offset 0 with an invalid cgx and lmac id */
+	rvu->pf2cgxlmac_map[0] = 0xFF;
+
+	/* Reverse map table */
+	rvu->cgxlmac2pf_map = devm_kzalloc(rvu->dev,
+				  cgx_cnt * MAX_LMAC_PER_CGX * sizeof(u16),
+				  GFP_KERNEL);
+	if (!rvu->cgxlmac2pf_map)
+		return -ENOMEM;
+
+	rvu->cgx_mapped_pfs = 0;
+	for (cgx = 0; cgx < cgx_cnt; cgx++) {
+		lmac_cnt = cgx_get_lmac_cnt(rvu_cgx_pdata(cgx, rvu));
+		for (lmac = 0; lmac < lmac_cnt; lmac++, pf++) {
+			rvu->pf2cgxlmac_map[pf] = cgxlmac_id_to_bmap(cgx, lmac);
+			rvu->cgxlmac2pf_map[CGX_OFFSET(cgx) + lmac] = 1 << pf;
+			rvu->cgx_mapped_pfs++;
+		}
+	}
+	return 0;
+}
+
+int rvu_cgx_probe(struct rvu *rvu)
+{
+	int i;
+
+	/* find available cgx ports */
+	rvu->cgx_cnt = cgx_get_cgx_cnt();
+	if (!rvu->cgx_cnt) {
+		dev_info(rvu->dev, "No CGX devices found!\n");
+		return -ENODEV;
+	}
+
+	rvu->cgx_idmap = devm_kzalloc(rvu->dev, rvu->cgx_cnt * sizeof(void *),
+				      GFP_KERNEL);
+	if (!rvu->cgx_idmap)
+		return -ENOMEM;
+
+	/* Initialize the cgxdata table */
+	for (i = 0; i < rvu->cgx_cnt; i++)
+		rvu->cgx_idmap[i] = cgx_get_pdata(i);
+
+	/* Map CGX LMAC interfaces to RVU PFs */
+	return rvu_map_cgx_lmac_pf(rvu);
+}