Merge branch 'net-ipa-endpoint-configuration-updates'

Alex Elder says:

====================
net: ipa: endpoint configuration updates

This series updates code that configures IPA endpoints.  The changes
made mainly affect access to registers that are valid only for RX, or
only for TX endpoints.

The first three patches avoid writing endpoint registers if they are
not defined to be valid.  The fourth patch slightly modifies the
parameters for the offset macros used for these endpoint registers,
to make it explicit when only some endpoints are valid.

The last patch just tweaks one line of code so it uses a convention
used everywhere else in the driver.

Version 2 of this series eliminates some of the "assert()" comments
that Jakub inquired about.  The ones removed will actually go away
in an upcoming (not-yet-posted) patch series anyway.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ipa/ipa_endpoint.c

@@ -530,7 +530,7 @@ static void ipa_endpoint_init_hdr_metadata_mask(struct ipa_endpoint *endpoint)
 	offset = IPA_REG_ENDP_INIT_HDR_METADATA_MASK_N_OFFSET(endpoint_id);
 
 	/* Note that HDR_ENDIANNESS indicates big endian header fields */
-	if (!endpoint->toward_ipa && endpoint->data->qmap)
+	if (endpoint->data->qmap)
 		val = cpu_to_be32(IPA_ENDPOINT_QMAP_METADATA_MASK);
 
 	iowrite32(val, endpoint->ipa->reg_virt + offset);
@@ -541,7 +541,7 @@ static void ipa_endpoint_init_mode(struct ipa_endpoint *endpoint)
 	u32 offset = IPA_REG_ENDP_INIT_MODE_N_OFFSET(endpoint->endpoint_id);
 	u32 val;
 
-	if (endpoint->toward_ipa && endpoint->data->dma_mode) {
+	if (endpoint->data->dma_mode) {
 		enum ipa_endpoint_name name = endpoint->data->dma_endpoint;
 		u32 dma_endpoint_id;
 
@@ -552,7 +552,7 @@ static void ipa_endpoint_init_mode(struct ipa_endpoint *endpoint)
 	} else {
 		val = u32_encode_bits(IPA_BASIC, MODE_FMASK);
 	}
-	/* Other bitfields unspecified (and 0) */
+	/* All other bits unspecified (and 0) */
 
 	iowrite32(val, endpoint->ipa->reg_virt + offset);
 }
@@ -674,7 +674,7 @@ ipa_endpoint_init_hol_block_enable(struct ipa_endpoint *endpoint, bool enable)
 	u32 offset;
 	u32 val;
 
-	val = u32_encode_bits(enable ? 1 : 0, HOL_BLOCK_EN_FMASK);
+	val = enable ? HOL_BLOCK_EN_FMASK : 0;
 	offset = IPA_REG_ENDP_INIT_HOL_BLOCK_EN_N_OFFSET(endpoint_id);
 	iowrite32(val, endpoint->ipa->reg_virt + offset);
 }
@@ -686,7 +686,7 @@ void ipa_endpoint_modem_hol_block_clear_all(struct ipa *ipa)
 	for (i = 0; i < IPA_ENDPOINT_MAX; i++) {
 		struct ipa_endpoint *endpoint = &ipa->endpoint[i];
 
-		if (endpoint->ee_id != GSI_EE_MODEM)
+		if (endpoint->toward_ipa || endpoint->ee_id != GSI_EE_MODEM)
 			continue;
 
 		(void)ipa_endpoint_init_hol_block_timer(endpoint, 0);
@@ -1300,16 +1300,16 @@ static void ipa_endpoint_program(struct ipa_endpoint *endpoint)
 		ipa_endpoint_init_aggr(endpoint);
 		ipa_endpoint_init_deaggr(endpoint);
 		ipa_endpoint_init_seq(endpoint);
+		ipa_endpoint_init_mode(endpoint);
 	} else {
 		if (endpoint->ipa->version == IPA_VERSION_3_5_1)
 			(void)ipa_endpoint_program_suspend(endpoint, false);
 		ipa_endpoint_init_hdr_ext(endpoint);
 		ipa_endpoint_init_aggr(endpoint);
+		ipa_endpoint_init_hdr_metadata_mask(endpoint);
 	}
 	ipa_endpoint_init_cfg(endpoint);
 	ipa_endpoint_init_hdr(endpoint);
-	ipa_endpoint_init_hdr_metadata_mask(endpoint);
-	ipa_endpoint_init_mode(endpoint);
 	ipa_endpoint_status(endpoint);
 }
 

drivers/net/ipa/ipa_reg.h

@@ -32,10 +32,12 @@ struct ipa;
  * parameter is supplied to the offset macro.  The "ee" value is a member of
  * the gsi_ee enumerated type.
  *
- * The offset of a register dependent on endpoint id is computed by a macro
- * that is supplied a parameter "ep".  The "ep" value is assumed to be less
- * than the maximum endpoint value for the current hardware, and that will
- * not exceed IPA_ENDPOINT_MAX.
+ * The offset of a register dependent on endpoint ID is computed by a macro
+ * that is supplied a parameter "ep", "txep", or "rxep".  A register with an
+ * "ep" parameter is valid for any endpoint; a register with a "txep" or
+ * "rxep" parameter is valid only for TX or RX endpoints, respectively.  The
+ * "*ep" value is assumed to be less than the maximum valid endpoint ID
+ * for the current hardware, and that will not exceed IPA_ENDPOINT_MAX.
  *
  * The offset of registers related to filter and route tables is computed
  * by a macro that is supplied a parameter "er".  The "er" represents an
@@ -292,11 +294,13 @@ static inline u32 ipa_reg_idle_indication_cfg_offset(enum ipa_version version)
 #define HDR_TOTAL_LEN_OR_PAD_OFFSET_FMASK	GENMASK(9, 4)
 #define HDR_PAD_TO_ALIGNMENT_FMASK		GENMASK(13, 10)
 
-#define IPA_REG_ENDP_INIT_HDR_METADATA_MASK_N_OFFSET(ep) \
-					(0x00000818 + 0x0070 * (ep))
+/* Valid only for RX (IPA producer) endpoints */
+#define IPA_REG_ENDP_INIT_HDR_METADATA_MASK_N_OFFSET(rxep) \
+					(0x00000818 + 0x0070 * (rxep))
 
-#define IPA_REG_ENDP_INIT_MODE_N_OFFSET(ep) \
-					(0x00000820 + 0x0070 * (ep))
+/* Valid only for TX (IPA consumer) endpoints */
+#define IPA_REG_ENDP_INIT_MODE_N_OFFSET(txep) \
+					(0x00000820 + 0x0070 * (txep))
 #define MODE_FMASK				GENMASK(2, 0)
 #define DEST_PIPE_INDEX_FMASK			GENMASK(8, 4)
 #define BYTE_THRESHOLD_FMASK			GENMASK(27, 12)
@@ -315,19 +319,21 @@ static inline u32 ipa_reg_idle_indication_cfg_offset(enum ipa_version version)
 #define AGGR_FORCE_CLOSE_FMASK			GENMASK(22, 22)
 #define AGGR_HARD_BYTE_LIMIT_ENABLE_FMASK	GENMASK(24, 24)
 
-#define IPA_REG_ENDP_INIT_HOL_BLOCK_EN_N_OFFSET(ep) \
-					(0x0000082c +  0x0070 * (ep))
+/* Valid only for RX (IPA producer) endpoints */
+#define IPA_REG_ENDP_INIT_HOL_BLOCK_EN_N_OFFSET(rxep) \
+					(0x0000082c +  0x0070 * (rxep))
 #define HOL_BLOCK_EN_FMASK			GENMASK(0, 0)
 
-/* The next register is valid only for RX (IPA producer) endpoints */
-#define IPA_REG_ENDP_INIT_HOL_BLOCK_TIMER_N_OFFSET(ep) \
-					(0x00000830 +  0x0070 * (ep))
+/* Valid only for RX (IPA producer) endpoints */
+#define IPA_REG_ENDP_INIT_HOL_BLOCK_TIMER_N_OFFSET(rxep) \
+					(0x00000830 +  0x0070 * (rxep))
 /* The next fields are present for IPA v4.2 only */
 #define BASE_VALUE_FMASK			GENMASK(4, 0)
 #define SCALE_FMASK				GENMASK(12, 8)
 
-#define IPA_REG_ENDP_INIT_DEAGGR_N_OFFSET(ep) \
-					(0x00000834 + 0x0070 * (ep))
+/* Valid only for TX (IPA consumer) endpoints */
+#define IPA_REG_ENDP_INIT_DEAGGR_N_OFFSET(txep) \
+					(0x00000834 + 0x0070 * (txep))
 #define DEAGGR_HDR_LEN_FMASK			GENMASK(5, 0)
 #define PACKET_OFFSET_VALID_FMASK		GENMASK(7, 7)
 #define PACKET_OFFSET_LOCATION_FMASK		GENMASK(13, 8)
@@ -337,8 +343,9 @@ static inline u32 ipa_reg_idle_indication_cfg_offset(enum ipa_version version)
 					(0x00000838 + 0x0070 * (ep))
 #define RSRC_GRP_FMASK				GENMASK(1, 0)
 
-#define IPA_REG_ENDP_INIT_SEQ_N_OFFSET(ep) \
-					(0x0000083c + 0x0070 * (ep))
+/* Valid only for TX (IPA consumer) endpoints */
+#define IPA_REG_ENDP_INIT_SEQ_N_OFFSET(txep) \
+					(0x0000083c + 0x0070 * (txep))
 #define HPS_SEQ_TYPE_FMASK			GENMASK(3, 0)
 #define DPS_SEQ_TYPE_FMASK			GENMASK(7, 4)
 #define HPS_REP_SEQ_TYPE_FMASK			GENMASK(11, 8)
@@ -352,7 +359,7 @@ static inline u32 ipa_reg_idle_indication_cfg_offset(enum ipa_version version)
 /* The next field is present for IPA v4.0 and above */
 #define STATUS_PKT_SUPPRESS_FMASK		GENMASK(9, 9)
 
-/* "er" is either an endpoint id (for filters) or a route id (for routes) */
+/* "er" is either an endpoint ID (for filters) or a route ID (for routes) */
 #define IPA_REG_ENDP_FILTER_ROUTER_HSH_CFG_N_OFFSET(er) \
 					(0x0000085c + 0x0070 * (er))
 #define FILTER_HASH_MSK_SRC_ID_FMASK		GENMASK(0, 0)