Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2000 insertions, 0 deletions

diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
new file mode 100644
index 000000000..093e11ec7
--- /dev/null
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -0,0 +1,2000 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
+ * Copyright (C) 2019-2022 Linaro Ltd.
+ */
+
+#include <linux/types.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <linux/bitfield.h>
+#include <linux/if_rmnet.h>
+#include <linux/dma-direction.h>
+
+#include "gsi.h"
+#include "gsi_trans.h"
+#include "ipa.h"
+#include "ipa_data.h"
+#include "ipa_endpoint.h"
+#include "ipa_cmd.h"
+#include "ipa_mem.h"
+#include "ipa_modem.h"
+#include "ipa_table.h"
+#include "ipa_gsi.h"
+#include "ipa_power.h"
+
+/* Hardware is told about receive buffers once a "batch" has been queued */
+#define IPA_REPLENISH_BATCH	16		/* Must be non-zero */
+
+/* The amount of RX buffer space consumed by standard skb overhead */
+#define IPA_RX_BUFFER_OVERHEAD	(PAGE_SIZE - SKB_MAX_ORDER(NET_SKB_PAD, 0))
+
+/* Where to find the QMAP mux_id for a packet within modem-supplied metadata */
+#define IPA_ENDPOINT_QMAP_METADATA_MASK		0x000000ff /* host byte order */
+
+#define IPA_ENDPOINT_RESET_AGGR_RETRY_MAX	3
+
+/** enum ipa_status_opcode - status element opcode hardware values */
+enum ipa_status_opcode {
+	IPA_STATUS_OPCODE_PACKET		= 0x01,
+	IPA_STATUS_OPCODE_DROPPED_PACKET	= 0x04,
+	IPA_STATUS_OPCODE_SUSPENDED_PACKET	= 0x08,
+	IPA_STATUS_OPCODE_PACKET_2ND_PASS	= 0x40,
+};
+
+/** enum ipa_status_exception - status element exception type */
+enum ipa_status_exception {
+	/* 0 means no exception */
+	IPA_STATUS_EXCEPTION_DEAGGR		= 0x01,
+};
+
+/* Status element provided by hardware */
+struct ipa_status {
+	u8 opcode;		/* enum ipa_status_opcode */
+	u8 exception;		/* enum ipa_status_exception */
+	__le16 mask;
+	__le16 pkt_len;
+	u8 endp_src_idx;
+	u8 endp_dst_idx;
+	__le32 metadata;
+	__le32 flags1;
+	__le64 flags2;
+	__le32 flags3;
+	__le32 flags4;
+};
+
+/* Field masks for struct ipa_status structure fields */
+#define IPA_STATUS_MASK_TAG_VALID_FMASK		GENMASK(4, 4)
+#define IPA_STATUS_SRC_IDX_FMASK		GENMASK(4, 0)
+#define IPA_STATUS_DST_IDX_FMASK		GENMASK(4, 0)
+#define IPA_STATUS_FLAGS1_RT_RULE_ID_FMASK	GENMASK(31, 22)
+#define IPA_STATUS_FLAGS2_TAG_FMASK		GENMASK_ULL(63, 16)
+
+/* Compute the aggregation size value to use for a given buffer size */
+static u32 ipa_aggr_size_kb(u32 rx_buffer_size, bool aggr_hard_limit)
+{
+	/* A hard aggregation limit will not be crossed; aggregation closes
+	 * if saving incoming data would cross the hard byte limit boundary.
+	 *
+	 * With a soft limit, aggregation closes *after* the size boundary
+	 * has been crossed.  In that case the limit must leave enough space
+	 * after that limit to receive a full MTU of data plus overhead.
+	 */
+	if (!aggr_hard_limit)
+		rx_buffer_size -= IPA_MTU + IPA_RX_BUFFER_OVERHEAD;
+
+	/* The byte limit is encoded as a number of kilobytes */
+
+	return rx_buffer_size / SZ_1K;
+}
+
+static bool ipa_endpoint_data_valid_one(struct ipa *ipa, u32 count,
+			    const struct ipa_gsi_endpoint_data *all_data,
+			    const struct ipa_gsi_endpoint_data *data)
+{
+	const struct ipa_gsi_endpoint_data *other_data;
+	struct device *dev = &ipa->pdev->dev;
+	enum ipa_endpoint_name other_name;
+
+	if (ipa_gsi_endpoint_data_empty(data))
+		return true;
+
+	if (!data->toward_ipa) {
+		const struct ipa_endpoint_rx *rx_config;
+		const struct ipa_reg *reg;
+		u32 buffer_size;
+		u32 aggr_size;
+		u32 limit;
+
+		if (data->endpoint.filter_support) {
+			dev_err(dev, "filtering not supported for "
+					"RX endpoint %u\n",
+				data->endpoint_id);
+			return false;
+		}
+
+		/* Nothing more to check for non-AP RX */
+		if (data->ee_id != GSI_EE_AP)
+			return true;
+
+		rx_config = &data->endpoint.config.rx;
+
+		/* The buffer size must hold an MTU plus overhead */
+		buffer_size = rx_config->buffer_size;
+		limit = IPA_MTU + IPA_RX_BUFFER_OVERHEAD;
+		if (buffer_size < limit) {
+			dev_err(dev, "RX buffer size too small for RX endpoint %u (%u < %u)\n",
+				data->endpoint_id, buffer_size, limit);
+			return false;
+		}
+
+		if (!data->endpoint.config.aggregation) {
+			bool result = true;
+
+			/* No aggregation; check for bogus aggregation data */
+			if (rx_config->aggr_time_limit) {
+				dev_err(dev,
+					"time limit with no aggregation for RX endpoint %u\n",
+					data->endpoint_id);
+				result = false;
+			}
+
+			if (rx_config->aggr_hard_limit) {
+				dev_err(dev, "hard limit with no aggregation for RX endpoint %u\n",
+					data->endpoint_id);
+				result = false;
+			}
+
+			if (rx_config->aggr_close_eof) {
+				dev_err(dev, "close EOF with no aggregation for RX endpoint %u\n",
+					data->endpoint_id);
+				result = false;
+			}
+
+			return result;	/* Nothing more to check */
+		}
+
+		/* For an endpoint supporting receive aggregation, the byte
+		 * limit defines the point at which aggregation closes.  This
+		 * check ensures the receive buffer size doesn't result in a
+		 * limit that exceeds what's representable in the aggregation
+		 * byte limit field.
+		 */
+		aggr_size = ipa_aggr_size_kb(buffer_size - NET_SKB_PAD,
+					     rx_config->aggr_hard_limit);
+		reg = ipa_reg(ipa, ENDP_INIT_AGGR);
+
+		limit = ipa_reg_field_max(reg, BYTE_LIMIT);
+		if (aggr_size > limit) {
+			dev_err(dev, "aggregated size too large for RX endpoint %u (%u KB > %u KB)\n",
+				data->endpoint_id, aggr_size, limit);
+
+			return false;
+		}
+
+		return true;	/* Nothing more to check for RX */
+	}
+
+	/* Starting with IPA v4.5 sequencer replication is obsolete */
+	if (ipa->version >= IPA_VERSION_4_5) {
+		if (data->endpoint.config.tx.seq_rep_type) {
+			dev_err(dev, "no-zero seq_rep_type TX endpoint %u\n",
+				data->endpoint_id);
+			return false;
+		}
+	}
+
+	if (data->endpoint.config.status_enable) {
+		other_name = data->endpoint.config.tx.status_endpoint;
+		if (other_name >= count) {
+			dev_err(dev, "status endpoint name %u out of range "
+					"for endpoint %u\n",
+				other_name, data->endpoint_id);
+			return false;
+		}
+
+		/* Status endpoint must be defined... */
+		other_data = &all_data[other_name];
+		if (ipa_gsi_endpoint_data_empty(other_data)) {
+			dev_err(dev, "DMA endpoint name %u undefined "
+					"for endpoint %u\n",
+				other_name, data->endpoint_id);
+			return false;
+		}
+
+		/* ...and has to be an RX endpoint... */
+		if (other_data->toward_ipa) {
+			dev_err(dev,
+				"status endpoint for endpoint %u not RX\n",
+				data->endpoint_id);
+			return false;
+		}
+
+		/* ...and if it's to be an AP endpoint... */
+		if (other_data->ee_id == GSI_EE_AP) {
+			/* ...make sure it has status enabled. */
+			if (!other_data->endpoint.config.status_enable) {
+				dev_err(dev,
+					"status not enabled for endpoint %u\n",
+					other_data->endpoint_id);
+				return false;
+			}
+		}
+	}
+
+	if (data->endpoint.config.dma_mode) {
+		other_name = data->endpoint.config.dma_endpoint;
+		if (other_name >= count) {
+			dev_err(dev, "DMA endpoint name %u out of range "
+					"for endpoint %u\n",
+				other_name, data->endpoint_id);
+			return false;
+		}
+
+		other_data = &all_data[other_name];
+		if (ipa_gsi_endpoint_data_empty(other_data)) {
+			dev_err(dev, "DMA endpoint name %u undefined "
+					"for endpoint %u\n",
+				other_name, data->endpoint_id);
+			return false;
+		}
+	}
+
+	return true;
+}
+
+static bool ipa_endpoint_data_valid(struct ipa *ipa, u32 count,
+				    const struct ipa_gsi_endpoint_data *data)
+{
+	const struct ipa_gsi_endpoint_data *dp = data;
+	struct device *dev = &ipa->pdev->dev;
+	enum ipa_endpoint_name name;
+
+	if (count > IPA_ENDPOINT_COUNT) {
+		dev_err(dev, "too many endpoints specified (%u > %u)\n",
+			count, IPA_ENDPOINT_COUNT);
+		return false;
+	}
+
+	/* Make sure needed endpoints have defined data */
+	if (ipa_gsi_endpoint_data_empty(&data[IPA_ENDPOINT_AP_COMMAND_TX])) {
+		dev_err(dev, "command TX endpoint not defined\n");
+		return false;
+	}
+	if (ipa_gsi_endpoint_data_empty(&data[IPA_ENDPOINT_AP_LAN_RX])) {
+		dev_err(dev, "LAN RX endpoint not defined\n");
+		return false;
+	}
+	if (ipa_gsi_endpoint_data_empty(&data[IPA_ENDPOINT_AP_MODEM_TX])) {
+		dev_err(dev, "AP->modem TX endpoint not defined\n");
+		return false;
+	}
+	if (ipa_gsi_endpoint_data_empty(&data[IPA_ENDPOINT_AP_MODEM_RX])) {
+		dev_err(dev, "AP<-modem RX endpoint not defined\n");
+		return false;
+	}
+
+	for (name = 0; name < count; name++, dp++)
+		if (!ipa_endpoint_data_valid_one(ipa, count, data, dp))
+			return false;
+
+	return true;
+}
+
+/* Allocate a transaction to use on a non-command endpoint */
+static struct gsi_trans *ipa_endpoint_trans_alloc(struct ipa_endpoint *endpoint,
+						  u32 tre_count)
+{
+	struct gsi *gsi = &endpoint->ipa->gsi;
+	u32 channel_id = endpoint->channel_id;
+	enum dma_data_direction direction;
+
+	direction = endpoint->toward_ipa ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
+
+	return gsi_channel_trans_alloc(gsi, channel_id, tre_count, direction);
+}
+
+/* suspend_delay represents suspend for RX, delay for TX endpoints.
+ * Note that suspend is not supported starting with IPA v4.0, and
+ * delay mode should not be used starting with IPA v4.2.
+ */
+static bool
+ipa_endpoint_init_ctrl(struct ipa_endpoint *endpoint, bool suspend_delay)
+{
+	struct ipa *ipa = endpoint->ipa;
+	const struct ipa_reg *reg;
+	u32 field_id;
+	u32 offset;
+	bool state;
+	u32 mask;
+	u32 val;
+
+	if (endpoint->toward_ipa)
+		WARN_ON(ipa->version >= IPA_VERSION_4_2);
+	else
+		WARN_ON(ipa->version >= IPA_VERSION_4_0);
+
+	reg = ipa_reg(ipa, ENDP_INIT_CTRL);
+	offset = ipa_reg_n_offset(reg, endpoint->endpoint_id);
+	val = ioread32(ipa->reg_virt + offset);
+
+	field_id = endpoint->toward_ipa ? ENDP_DELAY : ENDP_SUSPEND;
+	mask = ipa_reg_bit(reg, field_id);
+
+	state = !!(val & mask);
+
+	/* Don't bother if it's already in the requested state */
+	if (suspend_delay != state) {
+		val ^= mask;
+		iowrite32(val, ipa->reg_virt + offset);
+	}
+
+	return state;
+}
+
+/* We don't care what the previous state was for delay mode */
+static void
+ipa_endpoint_program_delay(struct ipa_endpoint *endpoint, bool enable)
+{
+	/* Delay mode should not be used for IPA v4.2+ */
+	WARN_ON(endpoint->ipa->version >= IPA_VERSION_4_2);
+	WARN_ON(!endpoint->toward_ipa);
+
+	(void)ipa_endpoint_init_ctrl(endpoint, enable);
+}
+
+static bool ipa_endpoint_aggr_active(struct ipa_endpoint *endpoint)
+{
+	u32 mask = BIT(endpoint->endpoint_id);
+	struct ipa *ipa = endpoint->ipa;
+	const struct ipa_reg *reg;
+	u32 val;
+
+	WARN_ON(!(mask & ipa->available));
+
+	reg = ipa_reg(ipa, STATE_AGGR_ACTIVE);
+	val = ioread32(ipa->reg_virt + ipa_reg_offset(reg));
+
+	return !!(val & mask);
+}
+
+static void ipa_endpoint_force_close(struct ipa_endpoint *endpoint)
+{
+	u32 mask = BIT(endpoint->endpoint_id);
+	struct ipa *ipa = endpoint->ipa;
+	const struct ipa_reg *reg;
+
+	WARN_ON(!(mask & ipa->available));
+
+	reg = ipa_reg(ipa, AGGR_FORCE_CLOSE);
+	iowrite32(mask, ipa->reg_virt + ipa_reg_offset(reg));
+}
+
+/**
+ * ipa_endpoint_suspend_aggr() - Emulate suspend interrupt
+ * @endpoint:	Endpoint on which to emulate a suspend
+ *
+ *  Emulate suspend IPA interrupt to unsuspend an endpoint suspended
+ *  with an open aggregation frame.  This is to work around a hardware
+ *  issue in IPA version 3.5.1 where the suspend interrupt will not be
+ *  generated when it should be.
+ */
+static void ipa_endpoint_suspend_aggr(struct ipa_endpoint *endpoint)
+{
+	struct ipa *ipa = endpoint->ipa;
+
+	if (!endpoint->config.aggregation)
+		return;
+
+	/* Nothing to do if the endpoint doesn't have aggregation open */
+	if (!ipa_endpoint_aggr_active(endpoint))
+		return;
+
+	/* Force close aggregation */
+	ipa_endpoint_force_close(endpoint);
+
+	ipa_interrupt_simulate_suspend(ipa->interrupt);
+}
+
+/* Returns previous suspend state (true means suspend was enabled) */
+static bool
+ipa_endpoint_program_suspend(struct ipa_endpoint *endpoint, bool enable)
+{
+	bool suspended;
+
+	if (endpoint->ipa->version >= IPA_VERSION_4_0)
+		return enable;	/* For IPA v4.0+, no change made */
+
+	WARN_ON(endpoint->toward_ipa);
+
+	suspended = ipa_endpoint_init_ctrl(endpoint, enable);
+
+	/* A client suspended with an open aggregation frame will not
+	 * generate a SUSPEND IPA interrupt.  If enabling suspend, have
+	 * ipa_endpoint_suspend_aggr() handle this.
+	 */
+	if (enable && !suspended)
+		ipa_endpoint_suspend_aggr(endpoint);
+
+	return suspended;
+}
+
+/* Put all modem RX endpoints into suspend mode, and stop transmission
+ * on all modem TX endpoints.  Prior to IPA v4.2, endpoint DELAY mode is
+ * used for TX endpoints; starting with IPA v4.2 we use GSI channel flow
+ * control instead.
+ */
+void ipa_endpoint_modem_pause_all(struct ipa *ipa, bool enable)
+{
+	u32 endpoint_id;
+
+	for (endpoint_id = 0; endpoint_id < IPA_ENDPOINT_MAX; endpoint_id++) {
+		struct ipa_endpoint *endpoint = &ipa->endpoint[endpoint_id];
+
+		if (endpoint->ee_id != GSI_EE_MODEM)
+			continue;
+
+		if (!endpoint->toward_ipa)
+			(void)ipa_endpoint_program_suspend(endpoint, enable);
+		else if (ipa->version < IPA_VERSION_4_2)
+			ipa_endpoint_program_delay(endpoint, enable);
+		else
+			gsi_modem_channel_flow_control(&ipa->gsi,
+						       endpoint->channel_id,
+						       enable);
+	}
+}
+
+/* Reset all modem endpoints to use the default exception endpoint */
+int ipa_endpoint_modem_exception_reset_all(struct ipa *ipa)
+{
+	u32 initialized = ipa->initialized;
+	struct gsi_trans *trans;
+	u32 count;
+
+	/* We need one command per modem TX endpoint, plus the commands
+	 * that clear the pipeline.
+	 */
+	count = ipa->modem_tx_count + ipa_cmd_pipeline_clear_count();
+	trans = ipa_cmd_trans_alloc(ipa, count);
+	if (!trans) {
+		dev_err(&ipa->pdev->dev,
+			"no transaction to reset modem exception endpoints\n");
+		return -EBUSY;
+	}
+
+	while (initialized) {
+		u32 endpoint_id = __ffs(initialized);
+		struct ipa_endpoint *endpoint;
+		const struct ipa_reg *reg;
+		u32 offset;
+
+		initialized ^= BIT(endpoint_id);
+
+		/* We only reset modem TX endpoints */
+		endpoint = &ipa->endpoint[endpoint_id];
+		if (!(endpoint->ee_id == GSI_EE_MODEM && endpoint->toward_ipa))
+			continue;
+
+		reg = ipa_reg(ipa, ENDP_STATUS);
+		offset = ipa_reg_n_offset(reg, endpoint_id);
+
+		/* Value written is 0, and all bits are updated.  That
+		 * means status is disabled on the endpoint, and as a
+		 * result all other fields in the register are ignored.
+		 */
+		ipa_cmd_register_write_add(trans, offset, 0, ~0, false);
+	}
+
+	ipa_cmd_pipeline_clear_add(trans);
+
+	gsi_trans_commit_wait(trans);
+
+	ipa_cmd_pipeline_clear_wait(ipa);
+
+	return 0;
+}
+
+static void ipa_endpoint_init_cfg(struct ipa_endpoint *endpoint)
+{
+	u32 endpoint_id = endpoint->endpoint_id;
+	struct ipa *ipa = endpoint->ipa;
+	enum ipa_cs_offload_en enabled;
+	const struct ipa_reg *reg;
+	u32 val = 0;
+
+	reg = ipa_reg(ipa, ENDP_INIT_CFG);
+	/* FRAG_OFFLOAD_EN is 0 */
+	if (endpoint->config.checksum) {
+		enum ipa_version version = ipa->version;
+
+		if (endpoint->toward_ipa) {
+			u32 off;
+
+			/* Checksum header offset is in 4-byte units */
+			off = sizeof(struct rmnet_map_header) / sizeof(u32);
+			val |= ipa_reg_encode(reg, CS_METADATA_HDR_OFFSET, off);
+
+			enabled = version < IPA_VERSION_4_5
+					? IPA_CS_OFFLOAD_UL
+					: IPA_CS_OFFLOAD_INLINE;
+		} else {
+			enabled = version < IPA_VERSION_4_5
+					? IPA_CS_OFFLOAD_DL
+					: IPA_CS_OFFLOAD_INLINE;
+		}
+	} else {
+		enabled = IPA_CS_OFFLOAD_NONE;
+	}
+	val |= ipa_reg_encode(reg, CS_OFFLOAD_EN, enabled);
+	/* CS_GEN_QMB_MASTER_SEL is 0 */
+
+	iowrite32(val, ipa->reg_virt + ipa_reg_n_offset(reg, endpoint_id));
+}
+
+static void ipa_endpoint_init_nat(struct ipa_endpoint *endpoint)
+{
+	u32 endpoint_id = endpoint->endpoint_id;
+	struct ipa *ipa = endpoint->ipa;
+	const struct ipa_reg *reg;
+	u32 val;
+
+	if (!endpoint->toward_ipa)
+		return;
+
+	reg = ipa_reg(ipa, ENDP_INIT_NAT);
+	val = ipa_reg_encode(reg, NAT_EN, IPA_NAT_BYPASS);
+
+	iowrite32(val, ipa->reg_virt + ipa_reg_n_offset(reg, endpoint_id));
+}
+
+static u32
+ipa_qmap_header_size(enum ipa_version version, struct ipa_endpoint *endpoint)
+{
+	u32 header_size = sizeof(struct rmnet_map_header);
+
+	/* Without checksum offload, we just have the MAP header */
+	if (!endpoint->config.checksum)
+		return header_size;
+
+	if (version < IPA_VERSION_4_5) {
+		/* Checksum header inserted for AP TX endpoints only */
+		if (endpoint->toward_ipa)
+			header_size += sizeof(struct rmnet_map_ul_csum_header);
+	} else {
+		/* Checksum header is used in both directions */
+		header_size += sizeof(struct rmnet_map_v5_csum_header);
+	}
+
+	return header_size;
+}
+
+/* Encoded value for ENDP_INIT_HDR register HDR_LEN* field(s) */
+static u32 ipa_header_size_encode(enum ipa_version version,
+				  const struct ipa_reg *reg, u32 header_size)
+{
+	u32 field_max = ipa_reg_field_max(reg, HDR_LEN);
+	u32 val;
+
+	/* We know field_max can be used as a mask (2^n - 1) */
+	val = ipa_reg_encode(reg, HDR_LEN, header_size & field_max);
+	if (version < IPA_VERSION_4_5) {
+		WARN_ON(header_size > field_max);
+		return val;
+	}
+
+	/* IPA v4.5 adds a few more most-significant bits */
+	header_size >>= hweight32(field_max);
+	WARN_ON(header_size > ipa_reg_field_max(reg, HDR_LEN_MSB));
+	val |= ipa_reg_encode(reg, HDR_LEN_MSB, header_size);
+
+	return val;
+}
+
+/* Encoded value for ENDP_INIT_HDR register OFST_METADATA* field(s) */
+static u32 ipa_metadata_offset_encode(enum ipa_version version,
+				      const struct ipa_reg *reg, u32 offset)
+{
+	u32 field_max = ipa_reg_field_max(reg, HDR_OFST_METADATA);
+	u32 val;
+
+	/* We know field_max can be used as a mask (2^n - 1) */
+	val = ipa_reg_encode(reg, HDR_OFST_METADATA, offset);
+	if (version < IPA_VERSION_4_5) {
+		WARN_ON(offset > field_max);
+		return val;
+	}
+
+	/* IPA v4.5 adds a few more most-significant bits */
+	offset >>= hweight32(field_max);
+	WARN_ON(offset > ipa_reg_field_max(reg, HDR_OFST_METADATA_MSB));
+	val |= ipa_reg_encode(reg, HDR_OFST_METADATA_MSB, offset);
+
+	return val;
+}
+
+/**
+ * ipa_endpoint_init_hdr() - Initialize HDR endpoint configuration register
+ * @endpoint:	Endpoint pointer
+ *
+ * We program QMAP endpoints so each packet received is preceded by a QMAP
+ * header structure.  The QMAP header contains a 1-byte mux_id and 2-byte
+ * packet size field, and we have the IPA hardware populate both for each
+ * received packet.  The header is configured (in the HDR_EXT register)
+ * to use big endian format.
+ *
+ * The packet size is written into the QMAP header's pkt_len field.  That
+ * location is defined here using the HDR_OFST_PKT_SIZE field.
+ *
+ * The mux_id comes from a 4-byte metadata value supplied with each packet
+ * by the modem.  It is *not* a QMAP header, but it does contain the mux_id
+ * value that we want, in its low-order byte.  A bitmask defined in the
+ * endpoint's METADATA_MASK register defines which byte within the modem
+ * metadata contains the mux_id.  And the OFST_METADATA field programmed
+ * here indicates where the extracted byte should be placed within the QMAP
+ * header.
+ */
+static void ipa_endpoint_init_hdr(struct ipa_endpoint *endpoint)
+{
+	u32 endpoint_id = endpoint->endpoint_id;
+	struct ipa *ipa = endpoint->ipa;
+	const struct ipa_reg *reg;
+	u32 val = 0;
+
+	reg = ipa_reg(ipa, ENDP_INIT_HDR);
+	if (endpoint->config.qmap) {
+		enum ipa_version version = ipa->version;
+		size_t header_size;
+
+		header_size = ipa_qmap_header_size(version, endpoint);
+		val = ipa_header_size_encode(version, reg, header_size);
+
+		/* Define how to fill fields in a received QMAP header */
+		if (!endpoint->toward_ipa) {
+			u32 off;     /* Field offset within header */
+
+			/* Where IPA will write the metadata value */
+			off = offsetof(struct rmnet_map_header, mux_id);
+			val |= ipa_metadata_offset_encode(version, reg, off);
+
+			/* Where IPA will write the length */
+			off = offsetof(struct rmnet_map_header, pkt_len);
+			/* Upper bits are stored in HDR_EXT with IPA v4.5 */
+			if (version >= IPA_VERSION_4_5)
+				off &= ipa_reg_field_max(reg, HDR_OFST_PKT_SIZE);
+
+			val |= ipa_reg_bit(reg, HDR_OFST_PKT_SIZE_VALID);
+			val |= ipa_reg_encode(reg, HDR_OFST_PKT_SIZE, off);
+		}
+		/* For QMAP TX, metadata offset is 0 (modem assumes this) */
+		val |= ipa_reg_bit(reg, HDR_OFST_METADATA_VALID);
+
+		/* HDR_ADDITIONAL_CONST_LEN is 0; (RX only) */
+		/* HDR_A5_MUX is 0 */
+		/* HDR_LEN_INC_DEAGG_HDR is 0 */
+		/* HDR_METADATA_REG_VALID is 0 (TX only, version < v4.5) */
+	}
+
+	iowrite32(val, ipa->reg_virt + ipa_reg_n_offset(reg, endpoint_id));
+}
+
+static void ipa_endpoint_init_hdr_ext(struct ipa_endpoint *endpoint)
+{
+	u32 pad_align = endpoint->config.rx.pad_align;
+	u32 endpoint_id = endpoint->endpoint_id;
+	struct ipa *ipa = endpoint->ipa;
+	const struct ipa_reg *reg;
+	u32 val = 0;
+
+	reg = ipa_reg(ipa, ENDP_INIT_HDR_EXT);
+	if (endpoint->config.qmap) {
+		/* We have a header, so we must specify its endianness */
+		val |= ipa_reg_bit(reg, HDR_ENDIANNESS);	/* big endian */
+
+		/* A QMAP header contains a 6 bit pad field at offset 0.
+		 * The RMNet driver assumes this field is meaningful in
+		 * packets it receives, and assumes the header's payload
+		 * length includes that padding.  The RMNet driver does
+		 * *not* pad packets it sends, however, so the pad field
+		 * (although 0) should be ignored.
+		 */
+		if (!endpoint->toward_ipa) {
+			val |= ipa_reg_bit(reg, HDR_TOTAL_LEN_OR_PAD_VALID);
+			/* HDR_TOTAL_LEN_OR_PAD is 0 (pad, not total_len) */
+			val |= ipa_reg_bit(reg, HDR_PAYLOAD_LEN_INC_PADDING);
+			/* HDR_TOTAL_LEN_OR_PAD_OFFSET is 0 */
+		}
+	}
+
+	/* HDR_PAYLOAD_LEN_INC_PADDING is 0 */
+	if (!endpoint->toward_ipa)
+		val |= ipa_reg_encode(reg, HDR_PAD_TO_ALIGNMENT, pad_align);
+
+	/* 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) {
+		/* HDR_TOTAL_LEN_OR_PAD_OFFSET is 0, so MSB is 0 */
+		if (endpoint->config.qmap && !endpoint->toward_ipa) {
+			u32 mask = ipa_reg_field_max(reg, HDR_OFST_PKT_SIZE);
+			u32 off;     /* Field offset within header */
+
+			off = offsetof(struct rmnet_map_header, pkt_len);
+			/* Low bits are in the ENDP_INIT_HDR register */
+			off >>= hweight32(mask);
+			val |= ipa_reg_encode(reg, HDR_OFST_PKT_SIZE_MSB, off);
+			/* HDR_ADDITIONAL_CONST_LEN is 0 so MSB is 0 */
+		}
+	}
+
+	iowrite32(val, ipa->reg_virt + ipa_reg_n_offset(reg, endpoint_id));
+}
+
+static void ipa_endpoint_init_hdr_metadata_mask(struct ipa_endpoint *endpoint)
+{
+	u32 endpoint_id = endpoint->endpoint_id;
+	struct ipa *ipa = endpoint->ipa;
+	const struct ipa_reg *reg;
+	u32 val = 0;
+	u32 offset;
+
+	if (endpoint->toward_ipa)
+		return;		/* Register not valid for TX endpoints */
+
+	reg = ipa_reg(ipa,  ENDP_INIT_HDR_METADATA_MASK);
+	offset = ipa_reg_n_offset(reg, endpoint_id);
+
+	/* Note that HDR_ENDIANNESS indicates big endian header fields */
+	if (endpoint->config.qmap)
+		val = (__force u32)cpu_to_be32(IPA_ENDPOINT_QMAP_METADATA_MASK);
+
+	iowrite32(val, ipa->reg_virt + offset);
+}
+
+static void ipa_endpoint_init_mode(struct ipa_endpoint *endpoint)
+{
+	struct ipa *ipa = endpoint->ipa;
+	const struct ipa_reg *reg;
+	u32 offset;
+	u32 val;
+
+	if (!endpoint->toward_ipa)
+		return;		/* Register not valid for RX endpoints */
+
+	reg = ipa_reg(ipa, ENDP_INIT_MODE);
+	if (endpoint->config.dma_mode) {
+		enum ipa_endpoint_name name = endpoint->config.dma_endpoint;
+		u32 dma_endpoint_id = ipa->name_map[name]->endpoint_id;
+
+		val = ipa_reg_encode(reg, ENDP_MODE, IPA_DMA);
+		val |= ipa_reg_encode(reg, DEST_PIPE_INDEX, dma_endpoint_id);
+	} else {
+		val = ipa_reg_encode(reg, ENDP_MODE, IPA_BASIC);
+	}
+	/* All other bits unspecified (and 0) */
+
+	offset = ipa_reg_n_offset(reg, endpoint->endpoint_id);
+	iowrite32(val, ipa->reg_virt + offset);
+}
+
+/* For IPA v4.5+, times are expressed using Qtime.  The AP uses one of two
+ * pulse generators (0 and 1) to measure elapsed time.  In ipa_qtime_config()
+ * they're configured to have granularity 100 usec and 1 msec, respectively.
+ *
+ * The return value is the positive or negative Qtime value to use to
+ * express the (microsecond) time provided.  A positive return value
+ * means pulse generator 0 can be used; otherwise use pulse generator 1.
+ */
+static int ipa_qtime_val(u32 microseconds, u32 max)
+{
+	u32 val;
+
+	/* Use 100 microsecond granularity if possible */
+	val = DIV_ROUND_CLOSEST(microseconds, 100);
+	if (val <= max)
+		return (int)val;
+
+	/* Have to use pulse generator 1 (millisecond granularity) */
+	val = DIV_ROUND_CLOSEST(microseconds, 1000);
+	WARN_ON(val > max);
+
+	return (int)-val;
+}
+
+/* Encode the aggregation timer limit (microseconds) based on IPA version */
+static u32 aggr_time_limit_encode(struct ipa *ipa, const struct ipa_reg *reg,
+				  u32 microseconds)
+{
+	u32 max;
+	u32 val;
+
+	if (!microseconds)
+		return 0;	/* Nothing to compute if time limit is 0 */
+
+	max = ipa_reg_field_max(reg, TIME_LIMIT);
+	if (ipa->version >= IPA_VERSION_4_5) {
+		u32 gran_sel;
+		int ret;
+
+		/* Compute the Qtime limit value to use */
+		ret = ipa_qtime_val(microseconds, max);
+		if (ret < 0) {
+			val = -ret;
+			gran_sel = ipa_reg_bit(reg, AGGR_GRAN_SEL);
+		} else {
+			val = ret;
+			gran_sel = 0;
+		}
+
+		return gran_sel | ipa_reg_encode(reg, TIME_LIMIT, val);
+	}
+
+	/* We program aggregation granularity in ipa_hardware_config() */
+	val = DIV_ROUND_CLOSEST(microseconds, IPA_AGGR_GRANULARITY);
+	WARN(val > max, "aggr_time_limit too large (%u > %u usec)\n",
+	     microseconds, max * IPA_AGGR_GRANULARITY);
+
+	return ipa_reg_encode(reg, TIME_LIMIT, val);
+}
+
+static void ipa_endpoint_init_aggr(struct ipa_endpoint *endpoint)
+{
+	u32 endpoint_id = endpoint->endpoint_id;
+	struct ipa *ipa = endpoint->ipa;
+	const struct ipa_reg *reg;
+	u32 val = 0;
+
+	reg = ipa_reg(ipa, ENDP_INIT_AGGR);
+	if (endpoint->config.aggregation) {
+		if (!endpoint->toward_ipa) {
+			const struct ipa_endpoint_rx *rx_config;
+			u32 buffer_size;
+			u32 limit;
+
+			rx_config = &endpoint->config.rx;
+			val |= ipa_reg_encode(reg, AGGR_EN, IPA_ENABLE_AGGR);
+			val |= ipa_reg_encode(reg, AGGR_TYPE, IPA_GENERIC);
+
+			buffer_size = rx_config->buffer_size;
+			limit = ipa_aggr_size_kb(buffer_size - NET_SKB_PAD,
+						 rx_config->aggr_hard_limit);
+			val |= ipa_reg_encode(reg, BYTE_LIMIT, limit);
+
+			limit = rx_config->aggr_time_limit;
+			val |= aggr_time_limit_encode(ipa, reg, limit);
+
+			/* AGGR_PKT_LIMIT is 0 (unlimited) */
+
+			if (rx_config->aggr_close_eof)
+				val |= ipa_reg_bit(reg, SW_EOF_ACTIVE);
+		} else {
+			val |= ipa_reg_encode(reg, AGGR_EN, IPA_ENABLE_DEAGGR);
+			val |= ipa_reg_encode(reg, AGGR_TYPE, IPA_QCMAP);
+			/* other fields ignored */
+		}
+		/* AGGR_FORCE_CLOSE is 0 */
+		/* AGGR_GRAN_SEL is 0 for IPA v4.5 */
+	} else {
+		val |= ipa_reg_encode(reg, AGGR_EN, IPA_BYPASS_AGGR);
+		/* other fields ignored */
+	}
+
+	iowrite32(val, ipa->reg_virt + ipa_reg_n_offset(reg, endpoint_id));
+}
+
+/* The head-of-line blocking timer is defined as a tick count.  For
+ * IPA version 4.5 the tick count is based on the Qtimer, which is
+ * derived from the 19.2 MHz SoC XO clock.  For older IPA versions
+ * each tick represents 128 cycles of the IPA core clock.
+ *
+ * Return the encoded value representing the timeout period provided
+ * that should be written to the ENDP_INIT_HOL_BLOCK_TIMER register.
+ */
+static u32 hol_block_timer_encode(struct ipa *ipa, const struct ipa_reg *reg,
+				  u32 microseconds)
+{
+	u32 width;
+	u32 scale;
+	u64 ticks;
+	u64 rate;
+	u32 high;
+	u32 val;
+
+	if (!microseconds)
+		return 0;	/* Nothing to compute if timer period is 0 */
+
+	if (ipa->version >= IPA_VERSION_4_5) {
+		u32 max = ipa_reg_field_max(reg, TIMER_LIMIT);
+		u32 gran_sel;
+		int ret;
+
+		/* Compute the Qtime limit value to use */
+		ret = ipa_qtime_val(microseconds, max);
+		if (ret < 0) {
+			val = -ret;
+			gran_sel = ipa_reg_bit(reg, TIMER_GRAN_SEL);
+		} else {
+			val = ret;
+			gran_sel = 0;
+		}
+
+		return gran_sel | ipa_reg_encode(reg, TIMER_LIMIT, val);
+	}
+
+	/* Use 64 bit arithmetic to avoid overflow */
+	rate = ipa_core_clock_rate(ipa);
+	ticks = DIV_ROUND_CLOSEST(microseconds * rate, 128 * USEC_PER_SEC);
+
+	/* We still need the result to fit into the field */
+	WARN_ON(ticks > ipa_reg_field_max(reg, TIMER_BASE_VALUE));
+
+	/* IPA v3.5.1 through v4.1 just record the tick count */
+	if (ipa->version < IPA_VERSION_4_2)
+		return ipa_reg_encode(reg, TIMER_BASE_VALUE, (u32)ticks);
+
+	/* For IPA v4.2, the tick count is represented by base and
+	 * scale fields within the 32-bit timer register, where:
+	 *     ticks = base << scale;
+	 * The best precision is achieved when the base value is as
+	 * large as possible.  Find the highest set bit in the tick
+	 * count, and extract the number of bits in the base field
+	 * such that high bit is included.
+	 */
+	high = fls(ticks);		/* 1..32 (or warning above) */
+	width = hweight32(ipa_reg_fmask(reg, TIMER_BASE_VALUE));
+	scale = high > width ? high - width : 0;
+	if (scale) {
+		/* If we're scaling, round up to get a closer result */
+		ticks += 1 << (scale - 1);
+		/* High bit was set, so rounding might have affected it */
+		if (fls(ticks) != high)
+			scale++;
+	}
+
+	val = ipa_reg_encode(reg, TIMER_SCALE, scale);
+	val |= ipa_reg_encode(reg, TIMER_BASE_VALUE, (u32)ticks >> scale);
+
+	return val;
+}
+
+/* If microseconds is 0, timeout is immediate */
+static void ipa_endpoint_init_hol_block_timer(struct ipa_endpoint *endpoint,
+					      u32 microseconds)
+{
+	u32 endpoint_id = endpoint->endpoint_id;
+	struct ipa *ipa = endpoint->ipa;
+	const struct ipa_reg *reg;
+	u32 val;
+
+	/* This should only be changed when HOL_BLOCK_EN is disabled */
+	reg = ipa_reg(ipa, ENDP_INIT_HOL_BLOCK_TIMER);
+	val = hol_block_timer_encode(ipa, reg, microseconds);
+
+	iowrite32(val, ipa->reg_virt + ipa_reg_n_offset(reg, endpoint_id));
+}
+
+static void
+ipa_endpoint_init_hol_block_en(struct ipa_endpoint *endpoint, bool enable)
+{
+	u32 endpoint_id = endpoint->endpoint_id;
+	struct ipa *ipa = endpoint->ipa;
+	const struct ipa_reg *reg;
+	u32 offset;
+	u32 val;
+
+	reg = ipa_reg(ipa, ENDP_INIT_HOL_BLOCK_EN);
+	offset = ipa_reg_n_offset(reg, endpoint_id);
+	val = enable ? ipa_reg_bit(reg, HOL_BLOCK_EN) : 0;
+
+	iowrite32(val, ipa->reg_virt + offset);
+
+	/* When enabling, the register must be written twice for IPA v4.5+ */
+	if (enable && ipa->version >= IPA_VERSION_4_5)
+		iowrite32(val, ipa->reg_virt + offset);
+}
+
+/* Assumes HOL_BLOCK is in disabled state */
+static void ipa_endpoint_init_hol_block_enable(struct ipa_endpoint *endpoint,
+					       u32 microseconds)
+{
+	ipa_endpoint_init_hol_block_timer(endpoint, microseconds);
+	ipa_endpoint_init_hol_block_en(endpoint, true);
+}
+
+static void ipa_endpoint_init_hol_block_disable(struct ipa_endpoint *endpoint)
+{
+	ipa_endpoint_init_hol_block_en(endpoint, false);
+}
+
+void ipa_endpoint_modem_hol_block_clear_all(struct ipa *ipa)
+{
+	u32 i;
+
+	for (i = 0; i < IPA_ENDPOINT_MAX; i++) {
+		struct ipa_endpoint *endpoint = &ipa->endpoint[i];
+
+		if (endpoint->toward_ipa || endpoint->ee_id != GSI_EE_MODEM)
+			continue;
+
+		ipa_endpoint_init_hol_block_disable(endpoint);
+		ipa_endpoint_init_hol_block_enable(endpoint, 0);
+	}
+}
+
+static void ipa_endpoint_init_deaggr(struct ipa_endpoint *endpoint)
+{
+	u32 endpoint_id = endpoint->endpoint_id;
+	struct ipa *ipa = endpoint->ipa;
+	const struct ipa_reg *reg;
+	u32 val = 0;
+
+	if (!endpoint->toward_ipa)
+		return;		/* Register not valid for RX endpoints */
+
+	reg = ipa_reg(ipa, ENDP_INIT_DEAGGR);
+	/* DEAGGR_HDR_LEN is 0 */
+	/* PACKET_OFFSET_VALID is 0 */
+	/* PACKET_OFFSET_LOCATION is ignored (not valid) */
+	/* MAX_PACKET_LEN is 0 (not enforced) */
+
+	iowrite32(val, ipa->reg_virt + ipa_reg_n_offset(reg, endpoint_id));
+}
+
+static void ipa_endpoint_init_rsrc_grp(struct ipa_endpoint *endpoint)
+{
+	u32 resource_group = endpoint->config.resource_group;
+	u32 endpoint_id = endpoint->endpoint_id;
+	struct ipa *ipa = endpoint->ipa;
+	const struct ipa_reg *reg;
+	u32 val;
+
+	reg = ipa_reg(ipa, ENDP_INIT_RSRC_GRP);
+	val = ipa_reg_encode(reg, ENDP_RSRC_GRP, resource_group);
+
+	iowrite32(val, ipa->reg_virt + ipa_reg_n_offset(reg, endpoint_id));
+}
+
+static void ipa_endpoint_init_seq(struct ipa_endpoint *endpoint)
+{
+	u32 endpoint_id = endpoint->endpoint_id;
+	struct ipa *ipa = endpoint->ipa;
+	const struct ipa_reg *reg;
+	u32 val;
+
+	if (!endpoint->toward_ipa)
+		return;		/* Register not valid for RX endpoints */
+
+	reg = ipa_reg(ipa, ENDP_INIT_SEQ);
+
+	/* Low-order byte configures primary packet processing */
+	val = ipa_reg_encode(reg, SEQ_TYPE, endpoint->config.tx.seq_type);
+
+	/* Second byte (if supported) configures replicated packet processing */
+	if (ipa->version < IPA_VERSION_4_5)
+		val |= ipa_reg_encode(reg, SEQ_REP_TYPE,
+				      endpoint->config.tx.seq_rep_type);
+
+	iowrite32(val, ipa->reg_virt + ipa_reg_n_offset(reg, endpoint_id));
+}
+
+/**
+ * ipa_endpoint_skb_tx() - Transmit a socket buffer
+ * @endpoint:	Endpoint pointer
+ * @skb:	Socket buffer to send
+ *
+ * Returns:	0 if successful, or a negative error code
+ */
+int ipa_endpoint_skb_tx(struct ipa_endpoint *endpoint, struct sk_buff *skb)
+{
+	struct gsi_trans *trans;
+	u32 nr_frags;
+	int ret;
+
+	/* Make sure source endpoint's TLV FIFO has enough entries to
+	 * hold the linear portion of the skb and all its fragments.
+	 * If not, see if we can linearize it before giving up.
+	 */
+	nr_frags = skb_shinfo(skb)->nr_frags;
+	if (nr_frags > endpoint->skb_frag_max) {
+		if (skb_linearize(skb))
+			return -E2BIG;
+		nr_frags = 0;
+	}
+
+	trans = ipa_endpoint_trans_alloc(endpoint, 1 + nr_frags);
+	if (!trans)
+		return -EBUSY;
+
+	ret = gsi_trans_skb_add(trans, skb);
+	if (ret)
+		goto err_trans_free;
+	trans->data = skb;	/* transaction owns skb now */
+
+	gsi_trans_commit(trans, !netdev_xmit_more());
+
+	return 0;
+
+err_trans_free:
+	gsi_trans_free(trans);
+
+	return -ENOMEM;
+}
+
+static void ipa_endpoint_status(struct ipa_endpoint *endpoint)
+{
+	u32 endpoint_id = endpoint->endpoint_id;
+	struct ipa *ipa = endpoint->ipa;
+	const struct ipa_reg *reg;
+	u32 val = 0;
+
+	reg = ipa_reg(ipa, ENDP_STATUS);
+	if (endpoint->config.status_enable) {
+		val |= ipa_reg_bit(reg, STATUS_EN);
+		if (endpoint->toward_ipa) {
+			enum ipa_endpoint_name name;
+			u32 status_endpoint_id;
+
+			name = endpoint->config.tx.status_endpoint;
+			status_endpoint_id = ipa->name_map[name]->endpoint_id;
+
+			val |= ipa_reg_encode(reg, STATUS_ENDP,
+					      status_endpoint_id);
+		}
+		/* STATUS_LOCATION is 0, meaning status element precedes
+		 * packet (not present for IPA v4.5+)
+		 */
+		/* STATUS_PKT_SUPPRESS_FMASK is 0 (not present for v4.0+) */
+	}
+
+	iowrite32(val, ipa->reg_virt + ipa_reg_n_offset(reg, endpoint_id));
+}
+
+static int ipa_endpoint_replenish_one(struct ipa_endpoint *endpoint,
+				      struct gsi_trans *trans)
+{
+	struct page *page;
+	u32 buffer_size;
+	u32 offset;
+	u32 len;
+	int ret;
+
+	buffer_size = endpoint->config.rx.buffer_size;
+	page = dev_alloc_pages(get_order(buffer_size));
+	if (!page)
+		return -ENOMEM;
+
+	/* Offset the buffer to make space for skb headroom */
+	offset = NET_SKB_PAD;
+	len = buffer_size - offset;
+
+	ret = gsi_trans_page_add(trans, page, len, offset);
+	if (ret)
+		put_page(page);
+	else
+		trans->data = page;	/* transaction owns page now */
+
+	return ret;
+}
+
+/**
+ * ipa_endpoint_replenish() - Replenish endpoint receive buffers
+ * @endpoint:	Endpoint to be replenished
+ *
+ * The IPA hardware can hold a fixed number of receive buffers for an RX
+ * endpoint, based on the number of entries in the underlying channel ring
+ * buffer.  If an endpoint's "backlog" is non-zero, it indicates how many
+ * more receive buffers can be supplied to the hardware.  Replenishing for
+ * an endpoint can be disabled, in which case buffers are not queued to
+ * the hardware.
+ */
+static void ipa_endpoint_replenish(struct ipa_endpoint *endpoint)
+{
+	struct gsi_trans *trans;
+
+	if (!test_bit(IPA_REPLENISH_ENABLED, endpoint->replenish_flags))
+		return;
+
+	/* Skip it if it's already active */
+	if (test_and_set_bit(IPA_REPLENISH_ACTIVE, endpoint->replenish_flags))
+		return;
+
+	while ((trans = ipa_endpoint_trans_alloc(endpoint, 1))) {
+		bool doorbell;
+
+		if (ipa_endpoint_replenish_one(endpoint, trans))
+			goto try_again_later;
+
+
+		/* Ring the doorbell if we've got a full batch */
+		doorbell = !(++endpoint->replenish_count % IPA_REPLENISH_BATCH);
+		gsi_trans_commit(trans, doorbell);
+	}
+
+	clear_bit(IPA_REPLENISH_ACTIVE, endpoint->replenish_flags);
+
+	return;
+
+try_again_later:
+	gsi_trans_free(trans);
+	clear_bit(IPA_REPLENISH_ACTIVE, endpoint->replenish_flags);
+
+	/* Whenever a receive buffer transaction completes we'll try to
+	 * replenish again.  It's unlikely, but if we fail to supply even
+	 * one buffer, nothing will trigger another replenish attempt.
+	 * If the hardware has no receive buffers queued, schedule work to
+	 * try replenishing again.
+	 */
+	if (gsi_channel_trans_idle(&endpoint->ipa->gsi, endpoint->channel_id))
+		schedule_delayed_work(&endpoint->replenish_work,
+				      msecs_to_jiffies(1));
+}
+
+static void ipa_endpoint_replenish_enable(struct ipa_endpoint *endpoint)
+{
+	set_bit(IPA_REPLENISH_ENABLED, endpoint->replenish_flags);
+
+	/* Start replenishing if hardware currently has no buffers */
+	if (gsi_channel_trans_idle(&endpoint->ipa->gsi, endpoint->channel_id))
+		ipa_endpoint_replenish(endpoint);
+}
+
+static void ipa_endpoint_replenish_disable(struct ipa_endpoint *endpoint)
+{
+	clear_bit(IPA_REPLENISH_ENABLED, endpoint->replenish_flags);
+}
+
+static void ipa_endpoint_replenish_work(struct work_struct *work)
+{
+	struct delayed_work *dwork = to_delayed_work(work);
+	struct ipa_endpoint *endpoint;
+
+	endpoint = container_of(dwork, struct ipa_endpoint, replenish_work);
+
+	ipa_endpoint_replenish(endpoint);
+}
+
+static void ipa_endpoint_skb_copy(struct ipa_endpoint *endpoint,
+				  void *data, u32 len, u32 extra)
+{
+	struct sk_buff *skb;
+
+	if (!endpoint->netdev)
+		return;
+
+	skb = __dev_alloc_skb(len, GFP_ATOMIC);
+	if (skb) {
+		/* Copy the data into the socket buffer and receive it */
+		skb_put(skb, len);
+		memcpy(skb->data, data, len);
+		skb->truesize += extra;
+	}
+
+	ipa_modem_skb_rx(endpoint->netdev, skb);
+}
+
+static bool ipa_endpoint_skb_build(struct ipa_endpoint *endpoint,
+				   struct page *page, u32 len)
+{
+	u32 buffer_size = endpoint->config.rx.buffer_size;
+	struct sk_buff *skb;
+
+	/* Nothing to do if there's no netdev */
+	if (!endpoint->netdev)
+		return false;
+
+	WARN_ON(len > SKB_WITH_OVERHEAD(buffer_size - NET_SKB_PAD));
+
+	skb = build_skb(page_address(page), buffer_size);
+	if (skb) {
+		/* Reserve the headroom and account for the data */
+		skb_reserve(skb, NET_SKB_PAD);
+		skb_put(skb, len);
+	}
+
+	/* Receive the buffer (or record drop if unable to build it) */
+	ipa_modem_skb_rx(endpoint->netdev, skb);
+
+	return skb != NULL;
+}
+
+/* The format of a packet status element is the same for several status
+ * types (opcodes).  Other types aren't currently supported.
+ */
+static bool ipa_status_format_packet(enum ipa_status_opcode opcode)
+{
+	switch (opcode) {
+	case IPA_STATUS_OPCODE_PACKET:
+	case IPA_STATUS_OPCODE_DROPPED_PACKET:
+	case IPA_STATUS_OPCODE_SUSPENDED_PACKET:
+	case IPA_STATUS_OPCODE_PACKET_2ND_PASS:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static bool ipa_endpoint_status_skip(struct ipa_endpoint *endpoint,
+				     const struct ipa_status *status)
+{
+	u32 endpoint_id;
+
+	if (!ipa_status_format_packet(status->opcode))
+		return true;
+	if (!status->pkt_len)
+		return true;
+	endpoint_id = u8_get_bits(status->endp_dst_idx,
+				  IPA_STATUS_DST_IDX_FMASK);
+	if (endpoint_id != endpoint->endpoint_id)
+		return true;
+
+	return false;	/* Don't skip this packet, process it */
+}
+
+static bool ipa_endpoint_status_tag(struct ipa_endpoint *endpoint,
+				    const struct ipa_status *status)
+{
+	struct ipa_endpoint *command_endpoint;
+	struct ipa *ipa = endpoint->ipa;
+	u32 endpoint_id;
+
+	if (!le16_get_bits(status->mask, IPA_STATUS_MASK_TAG_VALID_FMASK))
+		return false;	/* No valid tag */
+
+	/* The status contains a valid tag.  We know the packet was sent to
+	 * this endpoint (already verified by ipa_endpoint_status_skip()).
+	 * If the packet came from the AP->command TX endpoint we know
+	 * this packet was sent as part of the pipeline clear process.
+	 */
+	endpoint_id = u8_get_bits(status->endp_src_idx,
+				  IPA_STATUS_SRC_IDX_FMASK);
+	command_endpoint = ipa->name_map[IPA_ENDPOINT_AP_COMMAND_TX];
+	if (endpoint_id == command_endpoint->endpoint_id) {
+		complete(&ipa->completion);
+	} else {
+		dev_err(&ipa->pdev->dev,
+			"unexpected tagged packet from endpoint %u\n",
+			endpoint_id);
+	}
+
+	return true;
+}
+
+/* Return whether the status indicates the packet should be dropped */
+static bool ipa_endpoint_status_drop(struct ipa_endpoint *endpoint,
+				     const struct ipa_status *status)
+{
+	u32 val;
+
+	/* If the status indicates a tagged transfer, we'll drop the packet */
+	if (ipa_endpoint_status_tag(endpoint, status))
+		return true;
+
+	/* Deaggregation exceptions we drop; all other types we consume */
+	if (status->exception)
+		return status->exception == IPA_STATUS_EXCEPTION_DEAGGR;
+
+	/* Drop the packet if it fails to match a routing rule; otherwise no */
+	val = le32_get_bits(status->flags1, IPA_STATUS_FLAGS1_RT_RULE_ID_FMASK);
+
+	return val == field_max(IPA_STATUS_FLAGS1_RT_RULE_ID_FMASK);
+}
+
+static void ipa_endpoint_status_parse(struct ipa_endpoint *endpoint,
+				      struct page *page, u32 total_len)
+{
+	u32 buffer_size = endpoint->config.rx.buffer_size;
+	void *data = page_address(page) + NET_SKB_PAD;
+	u32 unused = buffer_size - total_len;
+	u32 resid = total_len;
+
+	while (resid) {
+		const struct ipa_status *status = data;
+		u32 align;
+		u32 len;
+
+		if (resid < sizeof(*status)) {
+			dev_err(&endpoint->ipa->pdev->dev,
+				"short message (%u bytes < %zu byte status)\n",
+				resid, sizeof(*status));
+			break;
+		}
+
+		/* Skip over status packets that lack packet data */
+		if (ipa_endpoint_status_skip(endpoint, status)) {
+			data += sizeof(*status);
+			resid -= sizeof(*status);
+			continue;
+		}
+
+		/* Compute the amount of buffer space consumed by the packet,
+		 * including the status element.  If the hardware is configured
+		 * to pad packet data to an aligned boundary, account for that.
+		 * And if checksum offload is enabled a trailer containing
+		 * computed checksum information will be appended.
+		 */
+		align = endpoint->config.rx.pad_align ? : 1;
+		len = le16_to_cpu(status->pkt_len);
+		len = sizeof(*status) + ALIGN(len, align);
+		if (endpoint->config.checksum)
+			len += sizeof(struct rmnet_map_dl_csum_trailer);
+
+		if (!ipa_endpoint_status_drop(endpoint, status)) {
+			void *data2;
+			u32 extra;
+			u32 len2;
+
+			/* Client receives only packet data (no status) */
+			data2 = data + sizeof(*status);
+			len2 = le16_to_cpu(status->pkt_len);
+
+			/* Have the true size reflect the extra unused space in
+			 * the original receive buffer.  Distribute the "cost"
+			 * proportionately across all aggregated packets in the
+			 * buffer.
+			 */
+			extra = DIV_ROUND_CLOSEST(unused * len, total_len);
+			ipa_endpoint_skb_copy(endpoint, data2, len2, extra);
+		}
+
+		/* Consume status and the full packet it describes */
+		data += len;
+		resid -= len;
+	}
+}
+
+void ipa_endpoint_trans_complete(struct ipa_endpoint *endpoint,
+				 struct gsi_trans *trans)
+{
+	struct page *page;
+
+	if (endpoint->toward_ipa)
+		return;
+
+	if (trans->cancelled)
+		goto done;
+
+	/* Parse or build a socket buffer using the actual received length */
+	page = trans->data;
+	if (endpoint->config.status_enable)
+		ipa_endpoint_status_parse(endpoint, page, trans->len);
+	else if (ipa_endpoint_skb_build(endpoint, page, trans->len))
+		trans->data = NULL;	/* Pages have been consumed */
+done:
+	ipa_endpoint_replenish(endpoint);
+}
+
+void ipa_endpoint_trans_release(struct ipa_endpoint *endpoint,
+				struct gsi_trans *trans)
+{
+	if (endpoint->toward_ipa) {
+		struct ipa *ipa = endpoint->ipa;
+
+		/* Nothing to do for command transactions */
+		if (endpoint != ipa->name_map[IPA_ENDPOINT_AP_COMMAND_TX]) {
+			struct sk_buff *skb = trans->data;
+
+			if (skb)
+				dev_kfree_skb_any(skb);
+		}
+	} else {
+		struct page *page = trans->data;
+
+		if (page)
+			put_page(page);
+	}
+}
+
+void ipa_endpoint_default_route_set(struct ipa *ipa, u32 endpoint_id)
+{
+	const struct ipa_reg *reg;
+	u32 val;
+
+	reg = ipa_reg(ipa, ROUTE);
+	/* ROUTE_DIS is 0 */
+	val = ipa_reg_encode(reg, ROUTE_DEF_PIPE, endpoint_id);
+	val |= ipa_reg_bit(reg, ROUTE_DEF_HDR_TABLE);
+	/* ROUTE_DEF_HDR_OFST is 0 */
+	val |= ipa_reg_encode(reg, ROUTE_FRAG_DEF_PIPE, endpoint_id);
+	val |= ipa_reg_bit(reg, ROUTE_DEF_RETAIN_HDR);
+
+	iowrite32(val, ipa->reg_virt + ipa_reg_offset(reg));
+}
+
+void ipa_endpoint_default_route_clear(struct ipa *ipa)
+{
+	ipa_endpoint_default_route_set(ipa, 0);
+}
+
+/**
+ * ipa_endpoint_reset_rx_aggr() - Reset RX endpoint with aggregation active
+ * @endpoint:	Endpoint to be reset
+ *
+ * If aggregation is active on an RX endpoint when a reset is performed
+ * on its underlying GSI channel, a special sequence of actions must be
+ * taken to ensure the IPA pipeline is properly cleared.
+ *
+ * Return:	0 if successful, or a negative error code
+ */
+static int ipa_endpoint_reset_rx_aggr(struct ipa_endpoint *endpoint)
+{
+	struct device *dev = &endpoint->ipa->pdev->dev;
+	struct ipa *ipa = endpoint->ipa;
+	struct gsi *gsi = &ipa->gsi;
+	bool suspended = false;
+	dma_addr_t addr;
+	u32 retries;
+	u32 len = 1;
+	void *virt;
+	int ret;
+
+	virt = kzalloc(len, GFP_KERNEL);
+	if (!virt)
+		return -ENOMEM;
+
+	addr = dma_map_single(dev, virt, len, DMA_FROM_DEVICE);
+	if (dma_mapping_error(dev, addr)) {
+		ret = -ENOMEM;
+		goto out_kfree;
+	}
+
+	/* Force close aggregation before issuing the reset */
+	ipa_endpoint_force_close(endpoint);
+
+	/* Reset and reconfigure the channel with the doorbell engine
+	 * disabled.  Then poll until we know aggregation is no longer
+	 * active.  We'll re-enable the doorbell (if appropriate) when
+	 * we reset again below.
+	 */
+	gsi_channel_reset(gsi, endpoint->channel_id, false);
+
+	/* Make sure the channel isn't suspended */
+	suspended = ipa_endpoint_program_suspend(endpoint, false);
+
+	/* Start channel and do a 1 byte read */
+	ret = gsi_channel_start(gsi, endpoint->channel_id);
+	if (ret)
+		goto out_suspend_again;
+
+	ret = gsi_trans_read_byte(gsi, endpoint->channel_id, addr);
+	if (ret)
+		goto err_endpoint_stop;
+
+	/* Wait for aggregation to be closed on the channel */
+	retries = IPA_ENDPOINT_RESET_AGGR_RETRY_MAX;
+	do {
+		if (!ipa_endpoint_aggr_active(endpoint))
+			break;
+		usleep_range(USEC_PER_MSEC, 2 * USEC_PER_MSEC);
+	} while (retries--);
+
+	/* Check one last time */
+	if (ipa_endpoint_aggr_active(endpoint))
+		dev_err(dev, "endpoint %u still active during reset\n",
+			endpoint->endpoint_id);
+
+	gsi_trans_read_byte_done(gsi, endpoint->channel_id);
+
+	ret = gsi_channel_stop(gsi, endpoint->channel_id);
+	if (ret)
+		goto out_suspend_again;
+
+	/* Finally, reset and reconfigure the channel again (re-enabling
+	 * the doorbell engine if appropriate).  Sleep for 1 millisecond to
+	 * complete the channel reset sequence.  Finish by suspending the
+	 * channel again (if necessary).
+	 */
+	gsi_channel_reset(gsi, endpoint->channel_id, true);
+
+	usleep_range(USEC_PER_MSEC, 2 * USEC_PER_MSEC);
+
+	goto out_suspend_again;
+
+err_endpoint_stop:
+	(void)gsi_channel_stop(gsi, endpoint->channel_id);
+out_suspend_again:
+	if (suspended)
+		(void)ipa_endpoint_program_suspend(endpoint, true);
+	dma_unmap_single(dev, addr, len, DMA_FROM_DEVICE);
+out_kfree:
+	kfree(virt);
+
+	return ret;
+}
+
+static void ipa_endpoint_reset(struct ipa_endpoint *endpoint)
+{
+	u32 channel_id = endpoint->channel_id;
+	struct ipa *ipa = endpoint->ipa;
+	bool special;
+	int ret = 0;
+
+	/* On IPA v3.5.1, if an RX endpoint is reset while aggregation
+	 * 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_4_0 && !endpoint->toward_ipa &&
+			endpoint->config.aggregation;
+	if (special && ipa_endpoint_aggr_active(endpoint))
+		ret = ipa_endpoint_reset_rx_aggr(endpoint);
+	else
+		gsi_channel_reset(&ipa->gsi, channel_id, true);
+
+	if (ret)
+		dev_err(&ipa->pdev->dev,
+			"error %d resetting channel %u for endpoint %u\n",
+			ret, endpoint->channel_id, endpoint->endpoint_id);
+}
+
+static void ipa_endpoint_program(struct ipa_endpoint *endpoint)
+{
+	if (endpoint->toward_ipa) {
+		/* Newer versions of IPA use GSI channel flow control
+		 * instead of endpoint DELAY mode to prevent sending data.
+		 * Flow control is disabled for newly-allocated channels,
+		 * and we can assume flow control is not (ever) enabled
+		 * for AP TX channels.
+		 */
+		if (endpoint->ipa->version < IPA_VERSION_4_2)
+			ipa_endpoint_program_delay(endpoint, false);
+	} else {
+		/* Ensure suspend mode is off on all AP RX endpoints */
+		(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);
+	ipa_endpoint_init_mode(endpoint);
+	ipa_endpoint_init_aggr(endpoint);
+	if (!endpoint->toward_ipa) {
+		if (endpoint->config.rx.holb_drop)
+			ipa_endpoint_init_hol_block_enable(endpoint, 0);
+		else
+			ipa_endpoint_init_hol_block_disable(endpoint);
+	}
+	ipa_endpoint_init_deaggr(endpoint);
+	ipa_endpoint_init_rsrc_grp(endpoint);
+	ipa_endpoint_init_seq(endpoint);
+	ipa_endpoint_status(endpoint);
+}
+
+int ipa_endpoint_enable_one(struct ipa_endpoint *endpoint)
+{
+	struct ipa *ipa = endpoint->ipa;
+	struct gsi *gsi = &ipa->gsi;
+	int ret;
+
+	ret = gsi_channel_start(gsi, endpoint->channel_id);
+	if (ret) {
+		dev_err(&ipa->pdev->dev,
+			"error %d starting %cX channel %u for endpoint %u\n",
+			ret, endpoint->toward_ipa ? 'T' : 'R',
+			endpoint->channel_id, endpoint->endpoint_id);
+		return ret;
+	}
+
+	if (!endpoint->toward_ipa) {
+		ipa_interrupt_suspend_enable(ipa->interrupt,
+					     endpoint->endpoint_id);
+		ipa_endpoint_replenish_enable(endpoint);
+	}
+
+	ipa->enabled |= BIT(endpoint->endpoint_id);
+
+	return 0;
+}
+
+void ipa_endpoint_disable_one(struct ipa_endpoint *endpoint)
+{
+	u32 mask = BIT(endpoint->endpoint_id);
+	struct ipa *ipa = endpoint->ipa;
+	struct gsi *gsi = &ipa->gsi;
+	int ret;
+
+	if (!(ipa->enabled & mask))
+		return;
+
+	ipa->enabled ^= mask;
+
+	if (!endpoint->toward_ipa) {
+		ipa_endpoint_replenish_disable(endpoint);
+		ipa_interrupt_suspend_disable(ipa->interrupt,
+					      endpoint->endpoint_id);
+	}
+
+	/* Note that if stop fails, the channel's state is not well-defined */
+	ret = gsi_channel_stop(gsi, endpoint->channel_id);
+	if (ret)
+		dev_err(&ipa->pdev->dev,
+			"error %d attempting to stop endpoint %u\n", ret,
+			endpoint->endpoint_id);
+}
+
+void ipa_endpoint_suspend_one(struct ipa_endpoint *endpoint)
+{
+	struct device *dev = &endpoint->ipa->pdev->dev;
+	struct gsi *gsi = &endpoint->ipa->gsi;
+	int ret;
+
+	if (!(endpoint->ipa->enabled & BIT(endpoint->endpoint_id)))
+		return;
+
+	if (!endpoint->toward_ipa) {
+		ipa_endpoint_replenish_disable(endpoint);
+		(void)ipa_endpoint_program_suspend(endpoint, true);
+	}
+
+	ret = gsi_channel_suspend(gsi, endpoint->channel_id);
+	if (ret)
+		dev_err(dev, "error %d suspending channel %u\n", ret,
+			endpoint->channel_id);
+}
+
+void ipa_endpoint_resume_one(struct ipa_endpoint *endpoint)
+{
+	struct device *dev = &endpoint->ipa->pdev->dev;
+	struct gsi *gsi = &endpoint->ipa->gsi;
+	int ret;
+
+	if (!(endpoint->ipa->enabled & BIT(endpoint->endpoint_id)))
+		return;
+
+	if (!endpoint->toward_ipa)
+		(void)ipa_endpoint_program_suspend(endpoint, false);
+
+	ret = gsi_channel_resume(gsi, endpoint->channel_id);
+	if (ret)
+		dev_err(dev, "error %d resuming channel %u\n", ret,
+			endpoint->channel_id);
+	else if (!endpoint->toward_ipa)
+		ipa_endpoint_replenish_enable(endpoint);
+}
+
+void ipa_endpoint_suspend(struct ipa *ipa)
+{
+	if (!ipa->setup_complete)
+		return;
+
+	if (ipa->modem_netdev)
+		ipa_modem_suspend(ipa->modem_netdev);
+
+	ipa_endpoint_suspend_one(ipa->name_map[IPA_ENDPOINT_AP_LAN_RX]);
+	ipa_endpoint_suspend_one(ipa->name_map[IPA_ENDPOINT_AP_COMMAND_TX]);
+}
+
+void ipa_endpoint_resume(struct ipa *ipa)
+{
+	if (!ipa->setup_complete)
+		return;
+
+	ipa_endpoint_resume_one(ipa->name_map[IPA_ENDPOINT_AP_COMMAND_TX]);
+	ipa_endpoint_resume_one(ipa->name_map[IPA_ENDPOINT_AP_LAN_RX]);
+
+	if (ipa->modem_netdev)
+		ipa_modem_resume(ipa->modem_netdev);
+}
+
+static void ipa_endpoint_setup_one(struct ipa_endpoint *endpoint)
+{
+	struct gsi *gsi = &endpoint->ipa->gsi;
+	u32 channel_id = endpoint->channel_id;
+
+	/* Only AP endpoints get set up */
+	if (endpoint->ee_id != GSI_EE_AP)
+		return;
+
+	endpoint->skb_frag_max = gsi->channel[channel_id].trans_tre_max - 1;
+	if (!endpoint->toward_ipa) {
+		/* RX transactions require a single TRE, so the maximum
+		 * backlog is the same as the maximum outstanding TREs.
+		 */
+		clear_bit(IPA_REPLENISH_ENABLED, endpoint->replenish_flags);
+		clear_bit(IPA_REPLENISH_ACTIVE, endpoint->replenish_flags);
+		INIT_DELAYED_WORK(&endpoint->replenish_work,
+				  ipa_endpoint_replenish_work);
+	}
+
+	ipa_endpoint_program(endpoint);
+
+	endpoint->ipa->set_up |= BIT(endpoint->endpoint_id);
+}
+
+static void ipa_endpoint_teardown_one(struct ipa_endpoint *endpoint)
+{
+	endpoint->ipa->set_up &= ~BIT(endpoint->endpoint_id);
+
+	if (!endpoint->toward_ipa)
+		cancel_delayed_work_sync(&endpoint->replenish_work);
+
+	ipa_endpoint_reset(endpoint);
+}
+
+void ipa_endpoint_setup(struct ipa *ipa)
+{
+	u32 initialized = ipa->initialized;
+
+	ipa->set_up = 0;
+	while (initialized) {
+		u32 endpoint_id = __ffs(initialized);
+
+		initialized ^= BIT(endpoint_id);
+
+		ipa_endpoint_setup_one(&ipa->endpoint[endpoint_id]);
+	}
+}
+
+void ipa_endpoint_teardown(struct ipa *ipa)
+{
+	u32 set_up = ipa->set_up;
+
+	while (set_up) {
+		u32 endpoint_id = __fls(set_up);
+
+		set_up ^= BIT(endpoint_id);
+
+		ipa_endpoint_teardown_one(&ipa->endpoint[endpoint_id]);
+	}
+	ipa->set_up = 0;
+}
+
+int ipa_endpoint_config(struct ipa *ipa)
+{
+	struct device *dev = &ipa->pdev->dev;
+	const struct ipa_reg *reg;
+	u32 initialized;
+	u32 rx_base;
+	u32 rx_mask;
+	u32 tx_mask;
+	int ret = 0;
+	u32 max;
+	u32 val;
+
+	/* Prior to IPAv3.5, the FLAVOR_0 register was not supported.
+	 * Furthermore, the endpoints were not grouped such that TX
+	 * endpoint numbers started with 0 and RX endpoints had numbers
+	 * higher than all TX endpoints, so we can't do the simple
+	 * direction check used for newer hardware below.
+	 *
+	 * For hardware that doesn't support the FLAVOR_0 register,
+	 * just set the available mask to support any endpoint, and
+	 * assume the configuration is valid.
+	 */
+	if (ipa->version < IPA_VERSION_3_5) {
+		ipa->available = ~0;
+		return 0;
+	}
+
+	/* Find out about the endpoints supplied by the hardware, and ensure
+	 * the highest one doesn't exceed the number we support.
+	 */
+	reg = ipa_reg(ipa, FLAVOR_0);
+	val = ioread32(ipa->reg_virt + ipa_reg_offset(reg));
+
+	/* Our RX is an IPA producer */
+	rx_base = ipa_reg_decode(reg, PROD_LOWEST, val);
+	max = rx_base + ipa_reg_decode(reg, MAX_PROD_PIPES, val);
+	if (max > IPA_ENDPOINT_MAX) {
+		dev_err(dev, "too many endpoints (%u > %u)\n",
+			max, IPA_ENDPOINT_MAX);
+		return -EINVAL;
+	}
+	rx_mask = GENMASK(max - 1, rx_base);
+
+	/* Our TX is an IPA consumer */
+	max = ipa_reg_decode(reg, MAX_CONS_PIPES, val);
+	tx_mask = GENMASK(max - 1, 0);
+
+	ipa->available = rx_mask | tx_mask;
+
+	/* Check for initialized endpoints not supported by the hardware */
+	if (ipa->initialized & ~ipa->available) {
+		dev_err(dev, "unavailable endpoint id(s) 0x%08x\n",
+			ipa->initialized & ~ipa->available);
+		ret = -EINVAL;		/* Report other errors too */
+	}
+
+	initialized = ipa->initialized;
+	while (initialized) {
+		u32 endpoint_id = __ffs(initialized);
+		struct ipa_endpoint *endpoint;
+
+		initialized ^= BIT(endpoint_id);
+
+		/* Make sure it's pointing in the right direction */
+		endpoint = &ipa->endpoint[endpoint_id];
+		if ((endpoint_id < rx_base) != endpoint->toward_ipa) {
+			dev_err(dev, "endpoint id %u wrong direction\n",
+				endpoint_id);
+			ret = -EINVAL;
+		}
+	}
+
+	return ret;
+}
+
+void ipa_endpoint_deconfig(struct ipa *ipa)
+{
+	ipa->available = 0;	/* Nothing more to do */
+}
+
+static void ipa_endpoint_init_one(struct ipa *ipa, enum ipa_endpoint_name name,
+				  const struct ipa_gsi_endpoint_data *data)
+{
+	struct ipa_endpoint *endpoint;
+
+	endpoint = &ipa->endpoint[data->endpoint_id];
+
+	if (data->ee_id == GSI_EE_AP)
+		ipa->channel_map[data->channel_id] = endpoint;
+	ipa->name_map[name] = endpoint;
+
+	endpoint->ipa = ipa;
+	endpoint->ee_id = data->ee_id;
+	endpoint->channel_id = data->channel_id;
+	endpoint->endpoint_id = data->endpoint_id;
+	endpoint->toward_ipa = data->toward_ipa;
+	endpoint->config = data->endpoint.config;
+
+	ipa->initialized |= BIT(endpoint->endpoint_id);
+}
+
+static void ipa_endpoint_exit_one(struct ipa_endpoint *endpoint)
+{
+	endpoint->ipa->initialized &= ~BIT(endpoint->endpoint_id);
+
+	memset(endpoint, 0, sizeof(*endpoint));
+}
+
+void ipa_endpoint_exit(struct ipa *ipa)
+{
+	u32 initialized = ipa->initialized;
+
+	while (initialized) {
+		u32 endpoint_id = __fls(initialized);
+
+		initialized ^= BIT(endpoint_id);
+
+		ipa_endpoint_exit_one(&ipa->endpoint[endpoint_id]);
+	}
+	memset(ipa->name_map, 0, sizeof(ipa->name_map));
+	memset(ipa->channel_map, 0, sizeof(ipa->channel_map));
+}
+
+/* Returns a bitmask of endpoints that support filtering, or 0 on error */
+u32 ipa_endpoint_init(struct ipa *ipa, u32 count,
+		      const struct ipa_gsi_endpoint_data *data)
+{
+	enum ipa_endpoint_name name;
+	u32 filter_map;
+
+	BUILD_BUG_ON(!IPA_REPLENISH_BATCH);
+
+	if (!ipa_endpoint_data_valid(ipa, count, data))
+		return 0;	/* Error */
+
+	ipa->initialized = 0;
+
+	filter_map = 0;
+	for (name = 0; name < count; name++, data++) {
+		if (ipa_gsi_endpoint_data_empty(data))
+			continue;	/* Skip over empty slots */
+
+		ipa_endpoint_init_one(ipa, name, data);
+
+		if (data->endpoint.filter_support)
+			filter_map |= BIT(data->endpoint_id);
+		if (data->ee_id == GSI_EE_MODEM && data->toward_ipa)
+			ipa->modem_tx_count++;
+	}
+
+	if (!ipa_filter_map_valid(ipa, filter_map))
+		goto err_endpoint_exit;
+
+	return filter_map;	/* Non-zero bitmask */
+
+err_endpoint_exit:
+	ipa_endpoint_exit(ipa);
+
+	return 0;	/* Error */
+}