[PATCH net-next v2 3/6] net: ipa: define the ENDP_INIT_NAT register

[Alex Elder]

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 <el...@linaro.org>
---
 drivers/net/ipa/ipa_endpoint.c | 17 ++++++++++++++++-
 drivers/net/ipa/ipa_reg.h      | 14 +++++++++++++-
 2 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
index 5f93bd60c7586..38e83cd467b52 100644
--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -1,7 +1,7 @@
 // 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);
diff --git a/drivers/net/ipa/ipa_reg.h b/drivers/net/ipa/ipa_reg.h
index 36fe746575f6b..bba088e80cd1e 100644
--- a/drivers/net/ipa/ipa_reg.h
+++ b/drivers/net/ipa/ipa_reg.h
@@ -1,7 +1,7 @@
 /* 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)
-- 
2.27.0