net: ipa: define the ENDP_INIT_NAT register

Define the ENDP_INIT_NAT register for setting up the NAT
configuration for an endpoint.  We aren't using NAT at this
time, so explicitly set the type to BYPASS for all endpoints.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ipa/ipa_endpoint.c

 // SPDX-License-Identifier: GPL-2.0
 
 /* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
- * Copyright (C) 2019-2020 Linaro Ltd.
+ * Copyright (C) 2019-2021 Linaro Ltd.
  */
 
 #include <linux/types.h>
@@ -468,6 +468,20 @@ static void ipa_endpoint_init_cfg(struct ipa_endpoint *endpoint)
 	iowrite32(val, endpoint->ipa->reg_virt + offset);
 }
 
+static void ipa_endpoint_init_nat(struct ipa_endpoint *endpoint)
+{
+	u32 offset;
+	u32 val;
+
+	if (!endpoint->toward_ipa)
+		return;
+
+	offset = IPA_REG_ENDP_INIT_NAT_N_OFFSET(endpoint->endpoint_id);
+	val = u32_encode_bits(IPA_NAT_BYPASS, NAT_EN_FMASK);
+
+	iowrite32(val, endpoint->ipa->reg_virt + offset);
+}
+
 /**
  * ipa_endpoint_init_hdr() - Initialize HDR endpoint configuration register
  * @endpoint:	Endpoint pointer
@@ -1488,6 +1502,7 @@ static void ipa_endpoint_program(struct ipa_endpoint *endpoint)
 	else
 		(void)ipa_endpoint_program_suspend(endpoint, false);
 	ipa_endpoint_init_cfg(endpoint);
+	ipa_endpoint_init_nat(endpoint);
 	ipa_endpoint_init_hdr(endpoint);
 	ipa_endpoint_init_hdr_ext(endpoint);
 	ipa_endpoint_init_hdr_metadata_mask(endpoint);

drivers/net/ipa/ipa_reg.h

 /* SPDX-License-Identifier: GPL-2.0 */
 
 /* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
- * Copyright (C) 2018-2020 Linaro Ltd.
+ * Copyright (C) 2018-2021 Linaro Ltd.
  */
 #ifndef _IPA_REG_H_
 #define _IPA_REG_H_
@@ -388,6 +388,18 @@ enum ipa_cs_offload_en {
 	IPA_CS_OFFLOAD_DL		= 0x2,
 };
 
+/* Valid only for TX (IPA consumer) endpoints */
+#define IPA_REG_ENDP_INIT_NAT_N_OFFSET(ep) \
+					(0x0000080c + 0x0070 * (ep))
+#define NAT_EN_FMASK				GENMASK(1, 0)
+
+/** enum ipa_nat_en - ENDP_INIT_NAT register NAT_EN field value */
+enum ipa_nat_en {
+	IPA_NAT_BYPASS			= 0x0,
+	IPA_NAT_SRC			= 0x1,
+	IPA_NAT_DST			= 0x2,
+};
+
 #define IPA_REG_ENDP_INIT_HDR_N_OFFSET(ep) \
 					(0x00000810 + 0x0070 * (ep))
 #define HDR_LEN_FMASK				GENMASK(5, 0)