octeontx2-af: Enable or disable CGX internal loopback

Add support to enable or disable internal loopback mode in CGX.
New mbox IDs CGX_INTLBK_ENABLE/DISABLE added for this.
Signed-off-by: Geetha sowjanya <gakula@marvell.com>
Signed-off-by: Linu Cherian <lcherian@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -194,6 +194,36 @@ static inline u8 cgx_get_lmac_type(struct cgx *cgx, int lmac_id)
 	return (cfg >> CGX_LMAC_TYPE_SHIFT) & CGX_LMAC_TYPE_MASK;
 }
 
+/* Configure CGX LMAC in internal loopback mode */
+int cgx_lmac_internal_loopback(void *cgxd, int lmac_id, bool enable)
+{
+	struct cgx *cgx = cgxd;
+	u8 lmac_type;
+	u64 cfg;
+
+	if (!cgx || lmac_id >= cgx->lmac_count)
+		return -ENODEV;
+
+	lmac_type = cgx_get_lmac_type(cgx, lmac_id);
+	if (lmac_type == LMAC_MODE_SGMII || lmac_type == LMAC_MODE_QSGMII) {
+		cfg = cgx_read(cgx, lmac_id, CGXX_GMP_PCS_MRX_CTL);
+		if (enable)
+			cfg |= CGXX_GMP_PCS_MRX_CTL_LBK;
+		else
+			cfg &= ~CGXX_GMP_PCS_MRX_CTL_LBK;
+		cgx_write(cgx, lmac_id, CGXX_GMP_PCS_MRX_CTL, cfg);
+	} else {
+		cfg = cgx_read(cgx, lmac_id, CGXX_SPUX_CONTROL1);
+		if (enable)
+			cfg |= CGXX_SPUX_CONTROL1_LBK;
+		else
+			cfg &= ~CGXX_SPUX_CONTROL1_LBK;
+		cgx_write(cgx, lmac_id, CGXX_SPUX_CONTROL1, cfg);
+	}
+	return 0;
+}
+EXPORT_SYMBOL(cgx_lmac_internal_loopback);
+
 void cgx_lmac_promisc_config(int cgx_id, int lmac_id, bool enable)
 {
 	struct cgx *cgx = cgx_get_pdata(cgx_id);

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

@@ -50,6 +50,10 @@
 #define CGXX_SCRATCH0_REG		0x1050
 #define CGXX_SCRATCH1_REG		0x1058
 #define CGX_CONST			0x2000
+#define CGXX_SPUX_CONTROL1		0x10000
+#define  CGXX_SPUX_CONTROL1_LBK			BIT_ULL(14)
+#define CGXX_GMP_PCS_MRX_CTL		0x30000
+#define  CGXX_GMP_PCS_MRX_CTL_LBK		BIT_ULL(14)
 
 #define CGX_COMMAND_REG			CGXX_SCRATCH1_REG
 #define CGX_EVENT_REG			CGXX_SCRATCH0_REG
@@ -100,6 +104,7 @@ int cgx_lmac_rx_tx_enable(void *cgxd, int lmac_id, bool enable);
 int cgx_lmac_addr_set(u8 cgx_id, u8 lmac_id, u8 *mac_addr);
 u64 cgx_lmac_addr_get(u8 cgx_id, u8 lmac_id);
 void cgx_lmac_promisc_config(int cgx_id, int lmac_id, bool enable);
+int cgx_lmac_internal_loopback(void *cgxd, int lmac_id, bool enable);
 int cgx_get_link_info(void *cgxd, int lmac_id,
 		      struct cgx_link_user_info *linfo);
 #endif /* CGX_H */

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

@@ -136,6 +136,8 @@ M(CGX_PROMISC_DISABLE,	0x206, msg_req, msg_rsp)			\
 M(CGX_START_LINKEVENTS, 0x207, msg_req, msg_rsp)			\
 M(CGX_STOP_LINKEVENTS,	0x208, msg_req, msg_rsp)			\
 M(CGX_GET_LINKINFO,	0x209, msg_req, cgx_link_info_msg)		\
+M(CGX_INTLBK_ENABLE,	0x20A, msg_req, msg_rsp)			\
+M(CGX_INTLBK_DISABLE,	0x20B, msg_req, msg_rsp)			\
 /* NPA mbox IDs (range 0x400 - 0x5FF) */				\
 /* SSO/SSOW mbox IDs (range 0x600 - 0x7FF) */				\
 /* TIM mbox IDs (range 0x800 - 0x9FF) */				\

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

@@ -192,4 +192,8 @@ int rvu_mbox_handler_CGX_STOP_LINKEVENTS(struct rvu *rvu, struct msg_req *req,
 					 struct msg_rsp *rsp);
 int rvu_mbox_handler_CGX_GET_LINKINFO(struct rvu *rvu, struct msg_req *req,
 				      struct cgx_link_info_msg *rsp);
+int rvu_mbox_handler_CGX_INTLBK_ENABLE(struct rvu *rvu, struct msg_req *req,
+				       struct msg_rsp *rsp);
+int rvu_mbox_handler_CGX_INTLBK_DISABLE(struct rvu *rvu, struct msg_req *req,
+					struct msg_rsp *rsp);
 #endif /* RVU_H */

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

@@ -479,3 +479,34 @@ int rvu_mbox_handler_CGX_GET_LINKINFO(struct rvu *rvu, struct msg_req *req,
 				&rsp->link_info);
 	return err;
 }
+
+static int rvu_cgx_config_intlbk(struct rvu *rvu, u16 pcifunc, bool en)
+{
+	int pf = rvu_get_pf(pcifunc);
+	u8 cgx_id, lmac_id;
+
+	/* This msg is expected only from PFs that are mapped to CGX LMACs,
+	 * if received from other PF/VF simply ACK, nothing to do.
+	 */
+	if ((pcifunc & RVU_PFVF_FUNC_MASK) || !is_pf_cgxmapped(rvu, pf))
+		return -ENODEV;
+
+	rvu_get_cgx_lmac_id(rvu->pf2cgxlmac_map[pf], &cgx_id, &lmac_id);
+
+	return cgx_lmac_internal_loopback(rvu_cgx_pdata(cgx_id, rvu),
+					  lmac_id, en);
+}
+
+int rvu_mbox_handler_CGX_INTLBK_ENABLE(struct rvu *rvu, struct msg_req *req,
+				       struct msg_rsp *rsp)
+{
+	rvu_cgx_config_intlbk(rvu, req->hdr.pcifunc, true);
+	return 0;
+}
+
+int rvu_mbox_handler_CGX_INTLBK_DISABLE(struct rvu *rvu, struct msg_req *req,
+					struct msg_rsp *rsp)
+{
+	rvu_cgx_config_intlbk(rvu, req->hdr.pcifunc, false);
+	return 0;
+}