[PATCH net-next v2 0/6] net: ipa: versions and registers

[PATCH net-next v2 0/6] net: ipa: versions and registers

[Alex Elder]

Version 2 of this series adds kernel-doc descriptions for all
members of the ipa_version enumerated type in patch 2.

The original description of the series is below.

					-Alex

This series is sort of a mix of things, generally related to
updating IPA versions and register definitions.

The first patch fixes some version-related tests throughout the code
so the conditions are valid for IPA versions other than the two that
are currently supported.  Support for additional versions is
forthcoming, and this is a preparatory step.

The second patch adds to the set of defined IPA versions, to include
all versions between 3.0 and 4.11.

The next defines an endpoint initialization register that was
previously not being configured.  We now initialize that register
(so that NAT is explicitly disabled) on all AP endpoints.

The fourth adds support for an extra bit in a field in a register,
which is present starting at IPA v4.5.

The last two are sort of standalone.  One just moves a function
definition and makes it private.  The other increases the number of
GSI channels and events supported by the driver, sufficient for IPA
v4.5.

					-Alex


Alex Elder (6):
  net: ipa: reduce IPA version assumptions
  net: ipa: update version definitions
  net: ipa: define the ENDP_INIT_NAT register
  net: ipa: limit local processing context address
  net: ipa: move ipa_aggr_granularity_val()
  net: ipa: increase channels and events

 drivers/net/ipa/gsi.c          |  8 +++----
 drivers/net/ipa/gsi.h          |  4 ++--
 drivers/net/ipa/ipa_cmd.c      | 26 ++++++++++++---------
 drivers/net/ipa/ipa_endpoint.c | 42 ++++++++++++++++++++++++----------
 drivers/net/ipa/ipa_main.c     | 21 ++++++++++++++---
 drivers/net/ipa/ipa_mem.c      |  6 +++--
 drivers/net/ipa/ipa_qmi.c      |  2 +-
 drivers/net/ipa/ipa_reg.h      | 40 ++++++++++++++++++++------------
 drivers/net/ipa/ipa_version.h  | 29 +++++++++++++++++------
 9 files changed, 121 insertions(+), 57 deletions(-)

-- 
2.27.0

[PATCH net-next v2 1/6] net: ipa: reduce IPA version assumptions

[Alex Elder]

Modify conditional tests throughout the IPA code so they do not
assume that IPA v3.5.1 is the oldest version supported.  Also remove
assumptions that IPA v4.5 is the newest version of IPA supported.

Augment versions in comments with "+", to be clearer that the
comment applies to a version and subsequent versions.  (E.g.,
"present for IPA v4.2+" instead of just "present for v4.2".)

Signed-off-by: Alex Elder <elder@linaro.org>
---
 drivers/net/ipa/gsi.c          |  8 ++++----
 drivers/net/ipa/ipa_cmd.c      | 26 +++++++++++++++-----------
 drivers/net/ipa/ipa_endpoint.c | 25 ++++++++++++++-----------
 drivers/net/ipa/ipa_main.c     |  6 +++---
 drivers/net/ipa/ipa_qmi.c      |  2 +-
 5 files changed, 37 insertions(+), 30 deletions(-)

diff --git a/drivers/net/ipa/gsi.c b/drivers/net/ipa/gsi.c
index b6355827bf900..7f2a8fce5e0db 100644
--- a/drivers/net/ipa/gsi.c
+++ b/drivers/net/ipa/gsi.c
@@ -827,14 +827,14 @@ static void gsi_channel_program(struct gsi_channel *channel, bool doorbell)
 
 	/* Max prefetch is 1 segment (do not set MAX_PREFETCH_FMASK) */
 
-	/* We enable the doorbell engine for IPA v3.5.1 */
-	if (gsi->version == IPA_VERSION_3_5_1 && doorbell)
+	/* No need to use the doorbell engine starting at IPA v4.0 */
+	if (gsi->version < IPA_VERSION_4_0 && doorbell)
 		val |= USE_DB_ENG_FMASK;
 
 	/* v4.0 introduces an escape buffer for prefetch.  We use it
 	 * on all but the AP command channel.
 	 */
-	if (gsi->version != IPA_VERSION_3_5_1 && !channel->command) {
+	if (gsi->version >= IPA_VERSION_4_0 && !channel->command) {
 		/* If not otherwise set, prefetch buffers are used */
 		if (gsi->version < IPA_VERSION_4_5)
 			val |= USE_ESCAPE_BUF_ONLY_FMASK;
@@ -973,7 +973,7 @@ void gsi_channel_reset(struct gsi *gsi, u32 channel_id, bool doorbell)
 
 	gsi_channel_reset_command(channel);
 	/* Due to a hardware quirk we may need to reset RX channels twice. */
-	if (gsi->version == IPA_VERSION_3_5_1 && !channel->toward_ipa)
+	if (gsi->version < IPA_VERSION_4_0 && !channel->toward_ipa)
 		gsi_channel_reset_command(channel);
 
 	gsi_channel_program(channel, doorbell);
diff --git a/drivers/net/ipa/ipa_cmd.c b/drivers/net/ipa/ipa_cmd.c
index 35e35852c25c5..a0be25f1f4427 100644
--- a/drivers/net/ipa/ipa_cmd.c
+++ b/drivers/net/ipa/ipa_cmd.c
@@ -71,13 +71,12 @@ struct ipa_cmd_hw_hdr_init_local {
 
 /* IPA_CMD_REGISTER_WRITE */
 
-/* For IPA v4.0+, this opcode gets modified with pipeline clear options */
-
+/* For IPA v4.0+, the pipeline clear options are encoded in the opcode */
 #define REGISTER_WRITE_OPCODE_SKIP_CLEAR_FMASK		GENMASK(8, 8)
 #define REGISTER_WRITE_OPCODE_CLEAR_OPTION_FMASK	GENMASK(10, 9)
 
 struct ipa_cmd_register_write {
-	__le16 flags;		/* Unused/reserved for IPA v3.5.1 */
+	__le16 flags;		/* Unused/reserved prior to IPA v4.0 */
 	__le16 offset;
 	__le32 value;
 	__le32 value_mask;
@@ -85,12 +84,12 @@ struct ipa_cmd_register_write {
 };
 
 /* Field masks for ipa_cmd_register_write structure fields */
-/* The next field is present for IPA v4.0 and above */
+/* The next field is present for IPA v4.0+ */
 #define REGISTER_WRITE_FLAGS_OFFSET_HIGH_FMASK		GENMASK(14, 11)
-/* The next field is present for IPA v3.5.1 only */
+/* The next field is not present for IPA v4.0+ */
 #define REGISTER_WRITE_FLAGS_SKIP_CLEAR_FMASK		GENMASK(15, 15)
 
-/* The next field and its values are present for IPA v3.5.1 only */
+/* The next field and its values are not present for IPA v4.0+ */
 #define REGISTER_WRITE_CLEAR_OPTIONS_FMASK		GENMASK(1, 0)
 
 /* IPA_CMD_IP_PACKET_INIT */
@@ -123,7 +122,7 @@ struct ipa_cmd_hw_dma_mem_mem {
 
 /* Field masks for ipa_cmd_hw_dma_mem_mem structure fields */
 #define DMA_SHARED_MEM_FLAGS_DIRECTION_FMASK		GENMASK(0, 0)
-/* The next two fields are present for IPA v3.5.1 only. */
+/* The next two fields are not present for IPA v4.0+ */
 #define DMA_SHARED_MEM_FLAGS_SKIP_CLEAR_FMASK		GENMASK(1, 1)
 #define DMA_SHARED_MEM_FLAGS_CLEAR_OPTIONS_FMASK	GENMASK(3, 2)
 
@@ -237,11 +236,12 @@ static bool ipa_cmd_register_write_offset_valid(struct ipa *ipa,
 	u32 bit_count;
 
 	/* The maximum offset in a register_write immediate command depends
-	 * on the version of IPA.  IPA v3.5.1 supports a 16 bit offset, but
-	 * newer versions allow some additional high-order bits.
+	 * on the version of IPA.  A 16 bit offset is always supported,
+	 * but starting with IPA v4.0 some additional high-order bits are
+	 * allowed.
 	 */
 	bit_count = BITS_PER_BYTE * sizeof(payload->offset);
-	if (ipa->version != IPA_VERSION_3_5_1)
+	if (ipa->version >= IPA_VERSION_4_0)
 		bit_count += hweight32(REGISTER_WRITE_FLAGS_OFFSET_HIGH_FMASK);
 	BUILD_BUG_ON(bit_count > 32);
 	offset_max = ~0U >> (32 - bit_count);
@@ -440,7 +440,11 @@ void ipa_cmd_register_write_add(struct gsi_trans *trans, u32 offset, u32 value,
 	/* pipeline_clear_src_grp is not used */
 	clear_option = clear_full ? pipeline_clear_full : pipeline_clear_hps;
 
-	if (ipa->version != IPA_VERSION_3_5_1) {
+	/* IPA v4.0+ represents the pipeline clear options in the opcode.  It
+	 * also supports a larger offset by encoding additional high-order
+	 * bits in the payload flags field.
+	 */
+	if (ipa->version >= IPA_VERSION_4_0) {
 		u16 offset_high;
 		u32 val;
 
diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
index 88310d3585574..5f93bd60c7586 100644
--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -266,7 +266,7 @@ ipa_endpoint_init_ctrl(struct ipa_endpoint *endpoint, bool suspend_delay)
 	 * if (endpoint->toward_ipa)
 	 * 	assert(ipa->version != IPA_VERSION_4.2);
 	 * else
-	 * 	assert(ipa->version == IPA_VERSION_3_5_1);
+	 *	assert(ipa->version < IPA_VERSION_4_0);
 	 */
 	mask = endpoint->toward_ipa ? ENDP_DELAY_FMASK : ENDP_SUSPEND_FMASK;
 
@@ -347,7 +347,7 @@ ipa_endpoint_program_suspend(struct ipa_endpoint *endpoint, bool enable)
 {
 	bool suspended;
 
-	if (endpoint->ipa->version != IPA_VERSION_3_5_1)
+	if (endpoint->ipa->version >= IPA_VERSION_4_0)
 		return enable;	/* For IPA v4.0+, no change made */
 
 	/* assert(!endpoint->toward_ipa); */
@@ -515,7 +515,7 @@ static void ipa_endpoint_init_hdr(struct ipa_endpoint *endpoint)
 			/* Where IPA will write the length */
 			offset = offsetof(struct rmnet_map_header, pkt_len);
 			/* Upper bits are stored in HDR_EXT with IPA v4.5 */
-			if (version == IPA_VERSION_4_5)
+			if (version >= IPA_VERSION_4_5)
 				offset &= field_mask(HDR_OFST_PKT_SIZE_FMASK);
 
 			val |= HDR_OFST_PKT_SIZE_VALID_FMASK;
@@ -562,7 +562,7 @@ static void ipa_endpoint_init_hdr_ext(struct ipa_endpoint *endpoint)
 	/* IPA v4.5 adds some most-significant bits to a few fields,
 	 * two of which are defined in the HDR (not HDR_EXT) register.
 	 */
-	if (ipa->version == IPA_VERSION_4_5) {
+	if (ipa->version >= IPA_VERSION_4_5) {
 		/* HDR_TOTAL_LEN_OR_PAD_OFFSET is 0, so MSB is 0 */
 		if (endpoint->data->qmap && !endpoint->toward_ipa) {
 			u32 offset;
@@ -776,7 +776,7 @@ static u32 hol_block_timer_val(struct ipa *ipa, u32 microseconds)
 	if (!microseconds)
 		return 0;	/* Nothing to compute if timer period is 0 */
 
-	if (ipa->version == IPA_VERSION_4_5)
+	if (ipa->version >= IPA_VERSION_4_5)
 		return hol_block_timer_qtime_val(ipa, microseconds);
 
 	/* Use 64 bit arithmetic to avoid overflow... */
@@ -1468,8 +1468,7 @@ static void ipa_endpoint_reset(struct ipa_endpoint *endpoint)
 	 * is active, we need to handle things specially to recover.
 	 * All other cases just need to reset the underlying GSI channel.
 	 */
-	special = ipa->version == IPA_VERSION_3_5_1 &&
-			!endpoint->toward_ipa &&
+	special = ipa->version < IPA_VERSION_4_0 && !endpoint->toward_ipa &&
 			endpoint->data->aggregation;
 	if (special && ipa_endpoint_aggr_active(endpoint))
 		ret = ipa_endpoint_reset_rx_aggr(endpoint);
@@ -1567,8 +1566,10 @@ void ipa_endpoint_suspend_one(struct ipa_endpoint *endpoint)
 		(void)ipa_endpoint_program_suspend(endpoint, true);
 	}
 
-	/* IPA v3.5.1 doesn't use channel stop for suspend */
-	stop_channel = endpoint->ipa->version != IPA_VERSION_3_5_1;
+	/* Starting with IPA v4.0, endpoints are suspended by stopping the
+	 * underlying GSI channel rather than using endpoint suspend mode.
+	 */
+	stop_channel = endpoint->ipa->version >= IPA_VERSION_4_0;
 	ret = gsi_channel_suspend(gsi, endpoint->channel_id, stop_channel);
 	if (ret)
 		dev_err(dev, "error %d suspending channel %u\n", ret,
@@ -1588,8 +1589,10 @@ void ipa_endpoint_resume_one(struct ipa_endpoint *endpoint)
 	if (!endpoint->toward_ipa)
 		(void)ipa_endpoint_program_suspend(endpoint, false);
 
-	/* IPA v3.5.1 doesn't use channel start for resume */
-	start_channel = endpoint->ipa->version != IPA_VERSION_3_5_1;
+	/* Starting with IPA v4.0, the underlying GSI channel must be
+	 * restarted for resume.
+	 */
+	start_channel = endpoint->ipa->version >= IPA_VERSION_4_0;
 	ret = gsi_channel_resume(gsi, endpoint->channel_id, start_channel);
 	if (ret)
 		dev_err(dev, "error %d resuming channel %u\n", ret,
diff --git a/drivers/net/ipa/ipa_main.c b/drivers/net/ipa/ipa_main.c
index 64b92dfdd3f5c..62d82d48aed69 100644
--- a/drivers/net/ipa/ipa_main.c
+++ b/drivers/net/ipa/ipa_main.c
@@ -227,8 +227,8 @@ static void ipa_hardware_config_comp(struct ipa *ipa)
 {
 	u32 val;
 
-	/* Nothing to configure for IPA v3.5.1 */
-	if (ipa->version == IPA_VERSION_3_5_1)
+	/* Nothing to configure prior to IPA v4.0 */
+	if (ipa->version < IPA_VERSION_4_0)
 		return;
 
 	val = ioread32(ipa->reg_virt + IPA_REG_COMP_CFG_OFFSET);
@@ -388,7 +388,7 @@ static void ipa_hardware_config(struct ipa *ipa, const struct ipa_data *data)
 	}
 
 	/* Implement some hardware workarounds */
-	if (version != IPA_VERSION_3_5_1 && version < IPA_VERSION_4_5) {
+	if (version >= IPA_VERSION_4_0 && version < IPA_VERSION_4_5) {
 		/* Enable open global clocks (not needed for IPA v4.5) */
 		val = GLOBAL_FMASK;
 		val |= GLOBAL_2X_CLK_FMASK;
diff --git a/drivers/net/ipa/ipa_qmi.c b/drivers/net/ipa/ipa_qmi.c
index af8666b89b375..7b833e92a0ac7 100644
--- a/drivers/net/ipa/ipa_qmi.c
+++ b/drivers/net/ipa/ipa_qmi.c
@@ -377,7 +377,7 @@ init_modem_driver_req(struct ipa_qmi *ipa_qmi)
 
 	/* None of the stats fields are valid (IPA v4.0 and above) */
 
-	if (ipa->version != IPA_VERSION_3_5_1) {
+	if (ipa->version >= IPA_VERSION_4_0) {
 		mem = &ipa->mem[IPA_MEM_STATS_QUOTA_MODEM];
 		if (mem->size) {
 			req.hw_stats_quota_base_addr_valid = 1;
-- 
2.27.0

[PATCH net-next v2 2/6] net: ipa: update version definitions

[Alex Elder]

Add IPA version definitions for all IPA v3.x and v4.x.  Fix the GSI
version associated with IPA version 4.1.

Signed-off-by: Alex Elder <elder@linaro.org>
---
v2: - Add kernel-doc descriptions for ipa_version members.

 drivers/net/ipa/ipa_version.h | 29 ++++++++++++++++++++++-------
 1 file changed, 22 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ipa/ipa_version.h b/drivers/net/ipa/ipa_version.h
index 2944e2a890231..ee2b3d02f3cd3 100644
--- a/drivers/net/ipa/ipa_version.h
+++ b/drivers/net/ipa/ipa_version.h
@@ -8,17 +8,32 @@
 
 /**
  * enum ipa_version
+ * @IPA_VERSION_3_0:	IPA version 3.0/GSI version 1.0
+ * @IPA_VERSION_3_1:	IPA version 3.1/GSI version 1.1
+ * @IPA_VERSION_3_5:	IPA version 3.5/GSI version 1.2
+ * @IPA_VERSION_3_5_1:	IPA version 3.5.1/GSI version 1.3
+ * @IPA_VERSION_4_0:	IPA version 4.0/GSI version 2.0
+ * @IPA_VERSION_4_1:	IPA version 4.1/GSI version 2.0
+ * @IPA_VERSION_4_2:	IPA version 4.2/GSI version 2.2
+ * @IPA_VERSION_4_5:	IPA version 4.5/GSI version 2.5
+ * @IPA_VERSION_4_7:	IPA version 4.7/GSI version 2.7
+ * @IPA_VERSION_4_9:	IPA version 4.9/GSI version 2.9
+ * @IPA_VERSION_4_11:	IPA version 4.11/GSI version 2.11 (2.1.1)
  *
  * Defines the version of IPA (and GSI) hardware present on the platform.
- * It seems this might be better defined elsewhere, but having it here gets
- * it where it's needed.
  */
 enum ipa_version {
-	IPA_VERSION_3_5_1,	/* GSI version 1.3.0 */
-	IPA_VERSION_4_0,	/* GSI version 2.0 */
-	IPA_VERSION_4_1,	/* GSI version 2.1 */
-	IPA_VERSION_4_2,	/* GSI version 2.2 */
-	IPA_VERSION_4_5,	/* GSI version 2.5 */
+	IPA_VERSION_3_0,
+	IPA_VERSION_3_1,
+	IPA_VERSION_3_5,
+	IPA_VERSION_3_5_1,
+	IPA_VERSION_4_0,
+	IPA_VERSION_4_1,
+	IPA_VERSION_4_2,
+	IPA_VERSION_4_5,
+	IPA_VERSION_4_7,
+	IPA_VERSION_4_9,
+	IPA_VERSION_4_11,
 };
 
 #endif /* _IPA_VERSION_H_ */
-- 
2.27.0

[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 <elder@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

[PATCH net-next v2 4/6] net: ipa: limit local processing context address

[Alex Elder]

Not all of the bits of the LOCAL_PKT_PROC_CNTXT register are valid.
Until IPA v4.5, there are 17 valid bits (though the bottom three
must be zero).  Starting with IPA v4.5, 18 bits are valid.

Introduce proc_cntxt_base_addr_encoded() to encode the base address
for use in the register using only the valid bits.

Shorten the name of the register (omit "_BASE") to avoid the need to
wrap the line in the one place it's used.

Signed-off-by: Alex Elder <elder@linaro.org>
---
 drivers/net/ipa/ipa_mem.c |  6 ++++--
 drivers/net/ipa/ipa_reg.h | 14 ++++++++++++--
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ipa/ipa_mem.c b/drivers/net/ipa/ipa_mem.c
index f25029b9ec857..32907dde5dc6a 100644
--- a/drivers/net/ipa/ipa_mem.c
+++ b/drivers/net/ipa/ipa_mem.c
@@ -61,6 +61,7 @@ int ipa_mem_setup(struct ipa *ipa)
 	struct gsi_trans *trans;
 	u32 offset;
 	u16 size;
+	u32 val;
 
 	/* Get a transaction to define the header memory region and to zero
 	 * the processing context and modem memory regions.
@@ -89,8 +90,9 @@ int ipa_mem_setup(struct ipa *ipa)
 	gsi_trans_commit_wait(trans);
 
 	/* Tell the hardware where the processing context area is located */
-	iowrite32(ipa->mem_offset + ipa->mem[IPA_MEM_MODEM_PROC_CTX].offset,
-		  ipa->reg_virt + IPA_REG_LOCAL_PKT_PROC_CNTXT_BASE_OFFSET);
+	offset = ipa->mem_offset + ipa->mem[IPA_MEM_MODEM_PROC_CTX].offset;
+	val = proc_cntxt_base_addr_encoded(ipa->version, offset);
+	iowrite32(val, ipa->reg_virt + IPA_REG_LOCAL_PKT_PROC_CNTXT_OFFSET);
 
 	return 0;
 }
diff --git a/drivers/net/ipa/ipa_reg.h b/drivers/net/ipa/ipa_reg.h
index bba088e80cd1e..cbfef27bbcf2c 100644
--- a/drivers/net/ipa/ipa_reg.h
+++ b/drivers/net/ipa/ipa_reg.h
@@ -217,8 +217,18 @@ static inline u32 ipa_reg_bcr_val(enum ipa_version version)
 	return 0x00000000;
 }
 
-/* The value of the next register must be a multiple of 8 */
-#define IPA_REG_LOCAL_PKT_PROC_CNTXT_BASE_OFFSET	0x000001e8
+/* The value of the next register must be a multiple of 8 (bottom 3 bits 0) */
+#define IPA_REG_LOCAL_PKT_PROC_CNTXT_OFFSET		0x000001e8
+
+/* Encoded value for LOCAL_PKT_PROC_CNTXT register BASE_ADDR field */
+static inline u32 proc_cntxt_base_addr_encoded(enum ipa_version version,
+					       u32 addr)
+{
+	if (version < IPA_VERSION_4_5)
+		return u32_encode_bits(addr, GENMASK(16, 0));
+
+	return u32_encode_bits(addr, GENMASK(17, 0));
+}
 
 /* ipa->available defines the valid bits in the AGGR_FORCE_CLOSE register */
 #define IPA_REG_AGGR_FORCE_CLOSE_OFFSET			0x000001ec
-- 
2.27.0

[PATCH net-next v2 5/6] net: ipa: move ipa_aggr_granularity_val()

[Alex Elder]

We only use ipa_aggr_granularity_val() inside "ipa_main.c", so it
doesn't really need to be defined in a header file.  It makes some
sense to be grouped with the register definitions, but it is unlike
the other inline functions now defined in "ipa_reg.h".  So move it
into "ipa_main.c" where it's used.  TIMER_FREQUENCY is used only
by that function, so move that definition as well.

Signed-off-by: Alex Elder <elder@linaro.org>
---
 drivers/net/ipa/ipa_main.c | 15 +++++++++++++++
 drivers/net/ipa/ipa_reg.h  | 12 ------------
 2 files changed, 15 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ipa/ipa_main.c b/drivers/net/ipa/ipa_main.c
index 62d82d48aed69..ba1bfc30210a3 100644
--- a/drivers/net/ipa/ipa_main.c
+++ b/drivers/net/ipa/ipa_main.c
@@ -287,6 +287,21 @@ ipa_hardware_config_qsb(struct ipa *ipa, const struct ipa_data *data)
 	iowrite32(val, ipa->reg_virt + IPA_REG_QSB_MAX_READS_OFFSET);
 }
 
+/* The internal inactivity timer clock is used for the aggregation timer */
+#define TIMER_FREQUENCY	32000		/* 32 KHz inactivity timer clock */
+
+/* Compute the value to use in the COUNTER_CFG register AGGR_GRANULARITY
+ * field to represent the given number of microseconds.  The value is one
+ * less than the number of timer ticks in the requested period.  0 is not
+ * a valid granularity value.
+ */
+static u32 ipa_aggr_granularity_val(u32 usec)
+{
+	/* assert(usec != 0); */
+
+	return DIV_ROUND_CLOSEST(usec * TIMER_FREQUENCY, USEC_PER_SEC) - 1;
+}
+
 /* IPA uses unified Qtime starting at IPA v4.5, implementing various
  * timestamps and timers independent of the IPA core clock rate.  The
  * Qtimer is based on a 56-bit timestamp incremented at each tick of
diff --git a/drivers/net/ipa/ipa_reg.h b/drivers/net/ipa/ipa_reg.h
index cbfef27bbcf2c..86fe2978e8102 100644
--- a/drivers/net/ipa/ipa_reg.h
+++ b/drivers/net/ipa/ipa_reg.h
@@ -237,18 +237,6 @@ static inline u32 proc_cntxt_base_addr_encoded(enum ipa_version version,
 #define IPA_REG_COUNTER_CFG_OFFSET			0x000001f0
 #define AGGR_GRANULARITY_FMASK			GENMASK(8, 4)
 
-/* The internal inactivity timer clock is used for the aggregation timer */
-#define TIMER_FREQUENCY	32000		/* 32 KHz inactivity timer clock */
-
-/* Compute the value to use in the AGGR_GRANULARITY field representing the
- * given number of microseconds.  The value is one less than the number of
- * timer ticks in the requested period.  0 not a valid granularity value.
- */
-static inline u32 ipa_aggr_granularity_val(u32 usec)
-{
-	return DIV_ROUND_CLOSEST(usec * TIMER_FREQUENCY, USEC_PER_SEC) - 1;
-}
-
 /* The next register is not present for IPA v4.5 */
 #define IPA_REG_TX_CFG_OFFSET				0x000001fc
 /* The first three fields are present for IPA v3.5.1 only */
-- 
2.27.0

[PATCH net-next v2 6/6] net: ipa: increase channels and events

[Alex Elder]

Increase the maximum number of channels and event rings supported by
the driver, to allow the maximum available on the SDX55.

Signed-off-by: Alex Elder <elder@linaro.org>
---
 drivers/net/ipa/gsi.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ipa/gsi.h b/drivers/net/ipa/gsi.h
index efc980f96109e..d5996bdb20ef5 100644
--- a/drivers/net/ipa/gsi.h
+++ b/drivers/net/ipa/gsi.h
@@ -16,8 +16,8 @@
 #include "ipa_version.h"
 
 /* Maximum number of channels and event rings supported by the driver */
-#define GSI_CHANNEL_COUNT_MAX	17
-#define GSI_EVT_RING_COUNT_MAX	13
+#define GSI_CHANNEL_COUNT_MAX	23
+#define GSI_EVT_RING_COUNT_MAX	20
 
 /* Maximum TLV FIFO size for a channel; 64 here is arbitrary (and high) */
 #define GSI_TLV_MAX		64
-- 
2.27.0

Re: [PATCH net-next v2 0/6] net: ipa: versions and registers

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (refs/heads/master):

On Wed, 24 Mar 2021 08:15:22 -0500 you wrote:
> Version 2 of this series adds kernel-doc descriptions for all
> members of the ipa_version enumerated type in patch 2.
> 
> The original description of the series is below.
> 
> 					-Alex
> 
> [...]

Here is the summary with links:
  - [net-next,v2,1/6] net: ipa: reduce IPA version assumptions
    https://git.kernel.org/netdev/net-next/c/d7f3087b396d
  - [net-next,v2,2/6] net: ipa: update version definitions
    https://git.kernel.org/netdev/net-next/c/eb09457c9d33
  - [net-next,v2,3/6] net: ipa: define the ENDP_INIT_NAT register
    https://git.kernel.org/netdev/net-next/c/647a05f3ae98
  - [net-next,v2,4/6] net: ipa: limit local processing context address
    https://git.kernel.org/netdev/net-next/c/e6e49e435512
  - [net-next,v2,5/6] net: ipa: move ipa_aggr_granularity_val()
    https://git.kernel.org/netdev/net-next/c/1910494ee32c
  - [net-next,v2,6/6] net: ipa: increase channels and events
    https://git.kernel.org/netdev/net-next/c/810a2e1f1073

You are awesome, thank you!
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