--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+
+/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
+ * Copyright (C) 2019-2020 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/version.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"
+
+#define atomic_dec_not_zero(v) atomic_add_unless((v), -1, 0)
+
+#define IPA_REPLENISH_BATCH 16
+
+#define IPA_RX_BUFFER_SIZE (PAGE_SIZE << IPA_RX_BUFFER_ORDER)
+#define IPA_RX_BUFFER_ORDER 1 /* 8KB endpoint RX buffers (2 pages) */
+
+/* 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))
+
+#define IPA_ENDPOINT_STOP_RX_RETRIES 10
+#define IPA_ENDPOINT_STOP_RX_SIZE 1 /* bytes */
+
+#define IPA_ENDPOINT_RESET_AGGR_RETRY_MAX 3
+#define IPA_AGGR_TIME_LIMIT_DEFAULT 1000 /* microseconds */
+
+#define ENDPOINT_STOP_DMA_TIMEOUT 15 /* milliseconds */
+
+/** enum ipa_status_opcode - status element opcode hardware values */
+enum ipa_status_opcode {
+ IPA_STATUS_OPCODE_PACKET = 0x01,
+ IPA_STATUS_OPCODE_NEW_FRAG_RULE = 0x02,
+ IPA_STATUS_OPCODE_DROPPED_PACKET = 0x04,
+ IPA_STATUS_OPCODE_SUSPENDED_PACKET = 0x08,
+ IPA_STATUS_OPCODE_LOG = 0x10,
+ IPA_STATUS_OPCODE_DCMP = 0x20,
+ 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,
+ IPA_STATUS_EXCEPTION_IPTYPE = 0x04,
+ IPA_STATUS_EXCEPTION_PACKET_LENGTH = 0x08,
+ IPA_STATUS_EXCEPTION_FRAG_RULE_MISS = 0x10,
+ IPA_STATUS_EXCEPTION_SW_FILT = 0x20,
+ /* The meaning of the next value depends on whether the IP version */
+ IPA_STATUS_EXCEPTION_NAT = 0x40, /* IPv4 */
+ IPA_STATUS_EXCEPTION_IPV6CT = IPA_STATUS_EXCEPTION_NAT,
+};
+
+/* 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_SRC_IDX_FMASK GENMASK(4, 0)
+
+#define IPA_STATUS_DST_IDX_FMASK GENMASK(4, 0)
+
+#define IPA_STATUS_FLAGS1_FLT_LOCAL_FMASK GENMASK(0, 0)
+#define IPA_STATUS_FLAGS1_FLT_HASH_FMASK GENMASK(1, 1)
+#define IPA_STATUS_FLAGS1_FLT_GLOBAL_FMASK GENMASK(2, 2)
+#define IPA_STATUS_FLAGS1_FLT_RET_HDR_FMASK GENMASK(3, 3)
+#define IPA_STATUS_FLAGS1_FLT_RULE_ID_FMASK GENMASK(13, 4)
+#define IPA_STATUS_FLAGS1_RT_LOCAL_FMASK GENMASK(14, 14)
+#define IPA_STATUS_FLAGS1_RT_HASH_FMASK GENMASK(15, 15)
+#define IPA_STATUS_FLAGS1_UCP_FMASK GENMASK(16, 16)
+#define IPA_STATUS_FLAGS1_RT_TBL_IDX_FMASK GENMASK(21, 17)
+#define IPA_STATUS_FLAGS1_RT_RULE_ID_FMASK GENMASK(31, 22)
+
+#define IPA_STATUS_FLAGS2_NAT_HIT_FMASK GENMASK_ULL(0, 0)
+#define IPA_STATUS_FLAGS2_NAT_ENTRY_IDX_FMASK GENMASK_ULL(13, 1)
+#define IPA_STATUS_FLAGS2_NAT_TYPE_FMASK GENMASK_ULL(15, 14)
+#define IPA_STATUS_FLAGS2_TAG_INFO_FMASK GENMASK_ULL(63, 16)
+
+#define IPA_STATUS_FLAGS3_SEQ_NUM_FMASK GENMASK(7, 0)
+#define IPA_STATUS_FLAGS3_TOD_CTR_FMASK GENMASK(31, 8)
+
+#define IPA_STATUS_FLAGS4_HDR_LOCAL_FMASK GENMASK(0, 0)
+#define IPA_STATUS_FLAGS4_HDR_OFFSET_FMASK GENMASK(10, 1)
+#define IPA_STATUS_FLAGS4_FRAG_HIT_FMASK GENMASK(11, 11)
+#define IPA_STATUS_FLAGS4_FRAG_RULE_FMASK GENMASK(15, 12)
+#define IPA_STATUS_FLAGS4_HW_SPECIFIC_FMASK GENMASK(31, 16)
+
+#ifdef IPA_VALIDATE
+
+static void ipa_endpoint_validate_build(void)
+{
+ /* The aggregation byte limit defines the point at which an
+ * aggregation window will close. It is programmed into the
+ * IPA hardware as a number of KB. We don't use "hard byte
+ * limit" aggregation, which means that we need to supply
+ * enough space in a receive buffer to hold a complete MTU
+ * plus normal skb overhead *after* that aggregation byte
+ * limit has been crossed.
+ *
+ * This check just ensures we don't define a receive buffer
+ * size that would exceed what we can represent in the field
+ * that is used to program its size.
+ */
+ BUILD_BUG_ON(IPA_RX_BUFFER_SIZE >
+ field_max(AGGR_BYTE_LIMIT_FMASK) * SZ_1K +
+ IPA_MTU + IPA_RX_BUFFER_OVERHEAD);
+
+ /* I honestly don't know where this requirement comes from. But
+ * it holds, and if we someday need to loosen the constraint we
+ * can try to track it down.
+ */
+ BUILD_BUG_ON(sizeof(struct ipa_status) % 4);
+}
+
+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) {
+ if (data->endpoint.filter_support) {
+ dev_err(dev, "filtering not supported for "
+ "RX endpoint %u\n",
+ data->endpoint_id);
+ return false;
+ }
+
+ return true; /* Nothing more to check for RX */
+ }
+
+ 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;
+
+ ipa_endpoint_validate_build();
+
+ 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;
+}
+
+#else /* !IPA_VALIDATE */
+
+static bool ipa_endpoint_data_valid(struct ipa *ipa, u32 count,
+ const struct ipa_gsi_endpoint_data *data)
+{
+ return true;
+}
+
+#endif /* !IPA_VALIDATE */
+
+/* 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.
+ */
+static int
+ipa_endpoint_init_ctrl(struct ipa_endpoint *endpoint, bool suspend_delay)
+{
+ u32 offset = IPA_REG_ENDP_INIT_CTRL_N_OFFSET(endpoint->endpoint_id);
+ struct ipa *ipa = endpoint->ipa;
+ u32 mask;
+ u32 val;
+
+ /* assert(ipa->version == IPA_VERSION_3_5_1 */
+ mask = endpoint->toward_ipa ? ENDP_DELAY_FMASK : ENDP_SUSPEND_FMASK;
+
+ val = ioread32(ipa->reg_virt + offset);
+ if (suspend_delay == !!(val & mask))
+ return -EALREADY; /* Already set to desired state */
+
+ val ^= mask;
+ iowrite32(val, ipa->reg_virt + offset);
+
+ return 0;
+}
+
+/* Enable or disable delay or suspend mode on all modem endpoints */
+void ipa_endpoint_modem_pause_all(struct ipa *ipa, bool enable)
+{
+ bool support_suspend;
+ u32 endpoint_id;
+
+ /* DELAY mode doesn't work right on IPA v4.2 */
+ if (ipa->version == IPA_VERSION_4_2)
+ return;
+
+ /* Only IPA v3.5.1 supports SUSPEND mode on RX endpoints */
+ support_suspend = ipa->version == IPA_VERSION_3_5_1;
+
+ 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;
+
+ /* Set TX delay mode, or for IPA v3.5.1 RX suspend mode */
+ if (endpoint->toward_ipa || support_suspend)
+ (void)ipa_endpoint_init_ctrl(endpoint, 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. We can get an upper
+ * bound on that by assuming all initialized endpoints are modem->IPA.
+ * That won't happen, and we could be more precise, but this is fine
+ * for now. We need to end the transactio with a "tag process."
+ */
+ count = hweight32(initialized) + ipa_cmd_tag_process_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;
+ 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;
+
+ offset = IPA_REG_ENDP_STATUS_N_OFFSET(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_tag_process_add(trans);
+
+ /* XXX This should have a 1 second timeout */
+ gsi_trans_commit_wait(trans);
+
+ return 0;
+}
+
+static void ipa_endpoint_init_cfg(struct ipa_endpoint *endpoint)
+{
+ u32 offset = IPA_REG_ENDP_INIT_CFG_N_OFFSET(endpoint->endpoint_id);
+ u32 val = 0;
+
+ /* FRAG_OFFLOAD_EN is 0 */
+ if (endpoint->data->checksum) {
+ if (endpoint->toward_ipa) {
+ u32 checksum_offset;
+
+ val |= u32_encode_bits(IPA_CS_OFFLOAD_UL,
+ CS_OFFLOAD_EN_FMASK);
+ /* Checksum header offset is in 4-byte units */
+ checksum_offset = sizeof(struct rmnet_map_header);
+ checksum_offset /= sizeof(u32);
+ val |= u32_encode_bits(checksum_offset,
+ CS_METADATA_HDR_OFFSET_FMASK);
+ } else {
+ val |= u32_encode_bits(IPA_CS_OFFLOAD_DL,
+ CS_OFFLOAD_EN_FMASK);
+ }
+ } else {
+ val |= u32_encode_bits(IPA_CS_OFFLOAD_NONE,
+ CS_OFFLOAD_EN_FMASK);
+ }
+ /* CS_GEN_QMB_MASTER_SEL is 0 */
+
+ iowrite32(val, endpoint->ipa->reg_virt + offset);
+}
+
+static void ipa_endpoint_init_hdr(struct ipa_endpoint *endpoint)
+{
+ u32 offset = IPA_REG_ENDP_INIT_HDR_N_OFFSET(endpoint->endpoint_id);
+ u32 val = 0;
+
+ if (endpoint->data->qmap) {
+ size_t header_size = sizeof(struct rmnet_map_header);
+
+ if (endpoint->toward_ipa && endpoint->data->checksum)
+ header_size += sizeof(struct rmnet_map_ul_csum_header);
+
+ val |= u32_encode_bits(header_size, HDR_LEN_FMASK);
+ /* metadata is the 4 byte rmnet_map header itself */
+ val |= HDR_OFST_METADATA_VALID_FMASK;
+ val |= u32_encode_bits(0, HDR_OFST_METADATA_FMASK);
+ /* HDR_ADDITIONAL_CONST_LEN is 0; (IPA->AP only) */
+ if (!endpoint->toward_ipa) {
+ u32 size_offset = offsetof(struct rmnet_map_header,
+ pkt_len);
+
+ val |= HDR_OFST_PKT_SIZE_VALID_FMASK;
+ val |= u32_encode_bits(size_offset,
+ HDR_OFST_PKT_SIZE_FMASK);
+ }
+ /* HDR_A5_MUX is 0 */
+ /* HDR_LEN_INC_DEAGG_HDR is 0 */
+ /* HDR_METADATA_REG_VALID is 0; (AP->IPA only) */
+ }
+
+ iowrite32(val, endpoint->ipa->reg_virt + offset);
+}
+
+static void ipa_endpoint_init_hdr_ext(struct ipa_endpoint *endpoint)
+{
+ u32 offset = IPA_REG_ENDP_INIT_HDR_EXT_N_OFFSET(endpoint->endpoint_id);
+ u32 pad_align = endpoint->data->rx.pad_align;
+ u32 val = 0;
+
+ val |= HDR_ENDIANNESS_FMASK; /* big endian */
+ val |= HDR_TOTAL_LEN_OR_PAD_VALID_FMASK;
+ /* HDR_TOTAL_LEN_OR_PAD is 0 (pad, not total_len) */
+ /* HDR_PAYLOAD_LEN_INC_PADDING is 0 */
+ /* HDR_TOTAL_LEN_OR_PAD_OFFSET is 0 */
+ if (!endpoint->toward_ipa)
+ val |= u32_encode_bits(pad_align, HDR_PAD_TO_ALIGNMENT_FMASK);
+
+ iowrite32(val, endpoint->ipa->reg_virt + offset);
+}
+
+/**
+ * Generate a metadata mask value that will select only the mux_id
+ * field in an rmnet_map header structure. The mux_id is at offset
+ * 1 byte from the beginning of the structure, but the metadata
+ * value is treated as a 4-byte unit. So this mask must be computed
+ * with endianness in mind. Note that ipa_endpoint_init_hdr_metadata_mask()
+ * will convert this value to the proper byte order.
+ *
+ * Marked __always_inline because this is really computing a
+ * constant value.
+ */
+static __always_inline __be32 ipa_rmnet_mux_id_metadata_mask(void)
+{
+ size_t mux_id_offset = offsetof(struct rmnet_map_header, mux_id);
+ u32 mux_id_mask = 0;
+ u8 *bytes;
+
+ bytes = (u8 *)&mux_id_mask;
+ bytes[mux_id_offset] = 0xff; /* mux_id is 1 byte */
+
+ return cpu_to_be32(mux_id_mask);
+}
+
+static void ipa_endpoint_init_hdr_metadata_mask(struct ipa_endpoint *endpoint)
+{
+ u32 endpoint_id = endpoint->endpoint_id;
+ u32 val = 0;
+ u32 offset;
+
+ offset = IPA_REG_ENDP_INIT_HDR_METADATA_MASK_N_OFFSET(endpoint_id);
+
+ if (!endpoint->toward_ipa && endpoint->data->qmap)
+ val = ipa_rmnet_mux_id_metadata_mask();
+
+ iowrite32(val, endpoint->ipa->reg_virt + offset);
+}
+
+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) {
+ enum ipa_endpoint_name name = endpoint->data->dma_endpoint;
+ u32 dma_endpoint_id;
+
+ dma_endpoint_id = endpoint->ipa->name_map[name]->endpoint_id;
+
+ val = u32_encode_bits(IPA_DMA, MODE_FMASK);
+ val |= u32_encode_bits(dma_endpoint_id, DEST_PIPE_INDEX_FMASK);
+ } else {
+ val = u32_encode_bits(IPA_BASIC, MODE_FMASK);
+ }
+ /* Other bitfields unspecified (and 0) */
+
+ iowrite32(val, endpoint->ipa->reg_virt + offset);
+}
+
+/* Compute the aggregation size value to use for a given buffer size */
+static u32 ipa_aggr_size_kb(u32 rx_buffer_size)
+{
+ /* We don't use "hard byte limit" aggregation, so we define the
+ * aggregation limit such that our buffer has enough space *after*
+ * that limit to receive a full MTU of data, plus overhead.
+ */
+ rx_buffer_size -= IPA_MTU + IPA_RX_BUFFER_OVERHEAD;
+
+ return rx_buffer_size / SZ_1K;
+}
+
+static void ipa_endpoint_init_aggr(struct ipa_endpoint *endpoint)
+{
+ u32 offset = IPA_REG_ENDP_INIT_AGGR_N_OFFSET(endpoint->endpoint_id);
+ u32 val = 0;
+
+ if (endpoint->data->aggregation) {
+ if (!endpoint->toward_ipa) {
+ u32 aggr_size = ipa_aggr_size_kb(IPA_RX_BUFFER_SIZE);
+ u32 limit;
+
+ val |= u32_encode_bits(IPA_ENABLE_AGGR, AGGR_EN_FMASK);
+ val |= u32_encode_bits(IPA_GENERIC, AGGR_TYPE_FMASK);
+ val |= u32_encode_bits(aggr_size,
+ AGGR_BYTE_LIMIT_FMASK);
+ limit = IPA_AGGR_TIME_LIMIT_DEFAULT;
+ val |= u32_encode_bits(limit / IPA_AGGR_GRANULARITY,
+ AGGR_TIME_LIMIT_FMASK);
+ val |= u32_encode_bits(0, AGGR_PKT_LIMIT_FMASK);
+ if (endpoint->data->rx.aggr_close_eof)
+ val |= AGGR_SW_EOF_ACTIVE_FMASK;
+ /* AGGR_HARD_BYTE_LIMIT_ENABLE is 0 */
+ } else {
+ val |= u32_encode_bits(IPA_ENABLE_DEAGGR,
+ AGGR_EN_FMASK);
+ val |= u32_encode_bits(IPA_QCMAP, AGGR_TYPE_FMASK);
+ /* other fields ignored */
+ }
+ /* AGGR_FORCE_CLOSE is 0 */
+ } else {
+ val |= u32_encode_bits(IPA_BYPASS_AGGR, AGGR_EN_FMASK);
+ /* other fields ignored */
+ }
+
+ iowrite32(val, endpoint->ipa->reg_virt + offset);
+}
+
+/* A return value of 0 indicates an error */
+static u32 ipa_reg_init_hol_block_timer_val(struct ipa *ipa, u32 microseconds)
+{
+ u32 scale;
+ u32 base;
+ u32 val;
+
+ if (!microseconds)
+ return 0; /* invalid delay */
+
+ /* Timer is represented in units of clock ticks. */
+ if (ipa->version < IPA_VERSION_4_2)
+ return microseconds; /* XXX Needs to be computed */
+
+ /* IPA v4.2 represents the tick count as base * scale */
+ scale = 1; /* XXX Needs to be computed */
+ if (scale > field_max(SCALE_FMASK))
+ return 0; /* scale too big */
+
+ base = DIV_ROUND_CLOSEST(microseconds, scale);
+ if (base > field_max(BASE_VALUE_FMASK))
+ return 0; /* microseconds too big */
+
+ val = u32_encode_bits(scale, SCALE_FMASK);
+ val |= u32_encode_bits(base, BASE_VALUE_FMASK);
+
+ return val;
+}
+
+static int ipa_endpoint_init_hol_block_timer(struct ipa_endpoint *endpoint,
+ u32 microseconds)
+{
+ u32 endpoint_id = endpoint->endpoint_id;
+ struct ipa *ipa = endpoint->ipa;
+ u32 offset;
+ u32 val;
+
+ /* XXX We'll fix this when the register definition is clear */
+ if (microseconds) {
+ struct device *dev = &ipa->pdev->dev;
+
+ dev_err(dev, "endpoint %u non-zero HOLB period (ignoring)\n",
+ endpoint_id);
+ microseconds = 0;
+ }
+
+ if (microseconds) {
+ val = ipa_reg_init_hol_block_timer_val(ipa, microseconds);
+ if (!val)
+ return -EINVAL;
+ } else {
+ val = 0; /* timeout is immediate */
+ }
+ offset = IPA_REG_ENDP_INIT_HOL_BLOCK_TIMER_N_OFFSET(endpoint_id);
+ iowrite32(val, ipa->reg_virt + offset);
+
+ return 0;
+}
+
+static void
+ipa_endpoint_init_hol_block_enable(struct ipa_endpoint *endpoint, bool enable)
+{
+ u32 endpoint_id = endpoint->endpoint_id;
+ u32 offset;
+ u32 val;
+
+ val = u32_encode_bits(enable ? 1 : 0, HOL_BLOCK_EN_FMASK);
+ offset = IPA_REG_ENDP_INIT_HOL_BLOCK_EN_N_OFFSET(endpoint_id);
+ iowrite32(val, endpoint->ipa->reg_virt + offset);
+}
+
+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->ee_id != GSI_EE_MODEM)
+ continue;
+
+ (void)ipa_endpoint_init_hol_block_timer(endpoint, 0);
+ ipa_endpoint_init_hol_block_enable(endpoint, true);
+ }
+}
+
+static void ipa_endpoint_init_deaggr(struct ipa_endpoint *endpoint)
+{
+ u32 offset = IPA_REG_ENDP_INIT_DEAGGR_N_OFFSET(endpoint->endpoint_id);
+ u32 val = 0;
+
+ /* 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, endpoint->ipa->reg_virt + offset);
+}
+
+static void ipa_endpoint_init_seq(struct ipa_endpoint *endpoint)
+{
+ u32 offset = IPA_REG_ENDP_INIT_SEQ_N_OFFSET(endpoint->endpoint_id);
+ u32 seq_type = endpoint->seq_type;
+ u32 val = 0;
+
+ val |= u32_encode_bits(seq_type & 0xf, HPS_SEQ_TYPE_FMASK);
+ val |= u32_encode_bits((seq_type >> 4) & 0xf, DPS_SEQ_TYPE_FMASK);
+ /* HPS_REP_SEQ_TYPE is 0 */
+ /* DPS_REP_SEQ_TYPE is 0 */
+
+ iowrite32(val, endpoint->ipa->reg_virt + offset);
+}
+
+/**
+ * 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 (1 + nr_frags > endpoint->trans_tre_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;
+ u32 val = 0;
+ u32 offset;
+
+ offset = IPA_REG_ENDP_STATUS_N_OFFSET(endpoint_id);
+
+ if (endpoint->data->status_enable) {
+ val |= STATUS_EN_FMASK;
+ if (endpoint->toward_ipa) {
+ enum ipa_endpoint_name name;
+ u32 status_endpoint_id;
+
+ name = endpoint->data->tx.status_endpoint;
+ status_endpoint_id = ipa->name_map[name]->endpoint_id;
+
+ val |= u32_encode_bits(status_endpoint_id,
+ STATUS_ENDP_FMASK);
+ }
+ /* STATUS_LOCATION is 0 (status element precedes packet) */
+ /* The next field is present for IPA v4.0 and above */
+ /* STATUS_PKT_SUPPRESS_FMASK is 0 */
+ }
+
+ iowrite32(val, ipa->reg_virt + offset);
+}
+
+static int ipa_endpoint_replenish_one(struct ipa_endpoint *endpoint)
+{
+ struct gsi_trans *trans;
+ bool doorbell = false;
+ struct page *page;
+ u32 offset;
+ u32 len;
+ int ret;
+
+ page = dev_alloc_pages(IPA_RX_BUFFER_ORDER);
+ if (!page)
+ return -ENOMEM;
+
+ trans = ipa_endpoint_trans_alloc(endpoint, 1);
+ if (!trans)
+ goto err_free_pages;
+
+ /* Offset the buffer to make space for skb headroom */
+ offset = NET_SKB_PAD;
+ len = IPA_RX_BUFFER_SIZE - offset;
+
+ ret = gsi_trans_page_add(trans, page, len, offset);
+ if (ret)
+ goto err_trans_free;
+ trans->data = page; /* transaction owns page now */
+
+ if (++endpoint->replenish_ready == IPA_REPLENISH_BATCH) {
+ doorbell = true;
+ endpoint->replenish_ready = 0;
+ }
+
+ gsi_trans_commit(trans, doorbell);
+
+ return 0;
+
+err_trans_free:
+ gsi_trans_free(trans);
+err_free_pages:
+ __free_pages(page, IPA_RX_BUFFER_ORDER);
+
+ return -ENOMEM;
+}
+
+/**
+ * ipa_endpoint_replenish() - Replenish the Rx packets cache.
+ *
+ * Allocate RX packet wrapper structures with maximal socket buffers
+ * for an endpoint. These are supplied to the hardware, which fills
+ * them with incoming data.
+ */
+static void ipa_endpoint_replenish(struct ipa_endpoint *endpoint, u32 count)
+{
+ struct gsi *gsi;
+ u32 backlog;
+
+ if (!endpoint->replenish_enabled) {
+ if (count)
+ atomic_add(count, &endpoint->replenish_saved);
+ return;
+ }
+
+
+ while (atomic_dec_not_zero(&endpoint->replenish_backlog))
+ if (ipa_endpoint_replenish_one(endpoint))
+ goto try_again_later;
+ if (count)
+ atomic_add(count, &endpoint->replenish_backlog);
+
+ return;
+
+try_again_later:
+ /* The last one didn't succeed, so fix the backlog */
+ backlog = atomic_inc_return(&endpoint->replenish_backlog);
+
+ if (count)
+ atomic_add(count, &endpoint->replenish_backlog);
+
+ /* 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.
+ * Receive buffer transactions use one TRE, so schedule work to
+ * try replenishing again if our backlog is *all* available TREs.
+ */
+ gsi = &endpoint->ipa->gsi;
+ if (backlog == gsi_channel_tre_max(gsi, endpoint->channel_id))
+ schedule_delayed_work(&endpoint->replenish_work,
+ msecs_to_jiffies(1));
+}
+
+static void ipa_endpoint_replenish_enable(struct ipa_endpoint *endpoint)
+{
+ struct gsi *gsi = &endpoint->ipa->gsi;
+ u32 max_backlog;
+ u32 saved;
+
+ endpoint->replenish_enabled = true;
+ while ((saved = atomic_xchg(&endpoint->replenish_saved, 0)))
+ atomic_add(saved, &endpoint->replenish_backlog);
+
+ /* Start replenishing if hardware currently has no buffers */
+ max_backlog = gsi_channel_tre_max(gsi, endpoint->channel_id);
+ if (atomic_read(&endpoint->replenish_backlog) == max_backlog)
+ ipa_endpoint_replenish(endpoint, 0);
+}
+
+static void ipa_endpoint_replenish_disable(struct ipa_endpoint *endpoint)
+{
+ u32 backlog;
+
+ endpoint->replenish_enabled = false;
+ while ((backlog = atomic_xchg(&endpoint->replenish_backlog, 0)))
+ atomic_add(backlog, &endpoint->replenish_saved);
+}
+
+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, 0);
+}
+
+static void ipa_endpoint_skb_copy(struct ipa_endpoint *endpoint,
+ void *data, u32 len, u32 extra)
+{
+ struct sk_buff *skb;
+
+ skb = __dev_alloc_skb(len, GFP_ATOMIC);
+ if (skb) {
+ skb_put(skb, len);
+ memcpy(skb->data, data, len);
+ skb->truesize += extra;
+ }
+
+ /* Now receive it, or drop it if there's no netdev */
+ if (endpoint->netdev)
+ ipa_modem_skb_rx(endpoint->netdev, skb);
+ else if (skb)
+ dev_kfree_skb_any(skb);
+}
+
+static bool ipa_endpoint_skb_build(struct ipa_endpoint *endpoint,
+ struct page *page, u32 len)
+{
+ struct sk_buff *skb;
+
+ /* Nothing to do if there's no netdev */
+ if (!endpoint->netdev)
+ return false;
+
+ /* assert(len <= SKB_WITH_OVERHEAD(IPA_RX_BUFFER_SIZE-NET_SKB_PAD)); */
+ skb = build_skb(page_address(page), IPA_RX_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). The NEW_FRAG_RULE, LOG, DCMP (decompression) 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 = u32_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 */
+}
+
+/* Return whether the status indicates the packet should be dropped */
+static bool ipa_status_drop_packet(const struct ipa_status *status)
+{
+ u32 val;
+
+ /* Deaggregation exceptions we drop; others 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)
+{
+ void *data = page_address(page) + NET_SKB_PAD;
+ u32 unused = IPA_RX_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 is enabled
+ * a trailer containing computed checksum information will
+ * be appended.
+ */
+ align = endpoint->data->rx.pad_align ? : 1;
+ len = le16_to_cpu(status->pkt_len);
+ len = sizeof(*status) + ALIGN(len, align);
+ if (endpoint->data->checksum)
+ len += sizeof(struct rmnet_map_dl_csum_trailer);
+
+ /* Charge the new packet with a proportional fraction of
+ * the unused space in the original receive buffer.
+ * XXX Charge a proportion of the *whole* receive buffer?
+ */
+ if (!ipa_status_drop_packet(status)) {
+ u32 extra = unused * len / total_len;
+ void *data2 = data + sizeof(*status);
+ u32 len2 = le16_to_cpu(status->pkt_len);
+
+ /* Client receives only packet data (no status) */
+ ipa_endpoint_skb_copy(endpoint, data2, len2, extra);
+ }
+
+ /* Consume status and the full packet it describes */
+ data += len;
+ resid -= len;
+ }
+}
+
+/* Complete a TX transaction, command or from ipa_endpoint_skb_tx() */
+static void ipa_endpoint_tx_complete(struct ipa_endpoint *endpoint,
+ struct gsi_trans *trans)
+{
+}
+
+/* Complete transaction initiated in ipa_endpoint_replenish_one() */
+static void ipa_endpoint_rx_complete(struct ipa_endpoint *endpoint,
+ struct gsi_trans *trans)
+{
+ struct page *page;
+
+ ipa_endpoint_replenish(endpoint, 1);
+
+ if (trans->cancelled)
+ return;
+
+ /* Parse or build a socket buffer using the actual received length */
+ page = trans->data;
+ if (endpoint->data->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 */
+}
+
+void ipa_endpoint_trans_complete(struct ipa_endpoint *endpoint,
+ struct gsi_trans *trans)
+{
+ if (endpoint->toward_ipa)
+ ipa_endpoint_tx_complete(endpoint, trans);
+ else
+ ipa_endpoint_rx_complete(endpoint, trans);
+}
+
+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)
+ __free_pages(page, IPA_RX_BUFFER_ORDER);
+ }
+}
+
+void ipa_endpoint_default_route_set(struct ipa *ipa, u32 endpoint_id)
+{
+ u32 val;
+
+ /* ROUTE_DIS is 0 */
+ val = u32_encode_bits(endpoint_id, ROUTE_DEF_PIPE_FMASK);
+ val |= ROUTE_DEF_HDR_TABLE_FMASK;
+ val |= u32_encode_bits(0, ROUTE_DEF_HDR_OFST_FMASK);
+ val |= u32_encode_bits(endpoint_id, ROUTE_FRAG_DEF_PIPE_FMASK);
+ val |= ROUTE_DEF_RETAIN_HDR_FMASK;
+
+ iowrite32(val, ipa->reg_virt + IPA_REG_ROUTE_OFFSET);
+}
+
+void ipa_endpoint_default_route_clear(struct ipa *ipa)
+{
+ ipa_endpoint_default_route_set(ipa, 0);
+}
+
+static bool ipa_endpoint_aggr_active(struct ipa_endpoint *endpoint)
+{
+ u32 mask = BIT(endpoint->endpoint_id);
+ struct ipa *ipa = endpoint->ipa;
+ u32 offset;
+ u32 val;
+
+ /* assert(mask & ipa->available); */
+ offset = ipa_reg_state_aggr_active_offset(ipa->version);
+ val = ioread32(ipa->reg_virt + offset);
+
+ return !!(val & mask);
+}
+
+static void ipa_endpoint_force_close(struct ipa_endpoint *endpoint)
+{
+ u32 mask = BIT(endpoint->endpoint_id);
+ struct ipa *ipa = endpoint->ipa;
+
+ /* assert(mask & ipa->available); */
+ iowrite32(mask, ipa->reg_virt + IPA_REG_AGGR_FORCE_CLOSE_OFFSET);
+}
+
+/**
+ * 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;
+ bool endpoint_suspended = false;
+ struct gsi *gsi = &ipa->gsi;
+ dma_addr_t addr;
+ bool db_enable;
+ 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 */
+ if (endpoint->ipa->version == IPA_VERSION_3_5_1)
+ if (!ipa_endpoint_init_ctrl(endpoint, false))
+ endpoint_suspended = true;
+
+ /* 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;
+ msleep(1);
+ } 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 = ipa_endpoint_stop(endpoint);
+ if (ret)
+ goto out_suspend_again;
+
+ /* Finally, reset and reconfigure the channel again (re-enabling the
+ * the doorbell engine if appropriate). Sleep for 1 millisecond to
+ * complete the channel reset sequence. Finish by suspending the
+ * channel again (if necessary).
+ */
+ db_enable = ipa->version == IPA_VERSION_3_5_1;
+ gsi_channel_reset(gsi, endpoint->channel_id, db_enable);
+
+ msleep(1);
+
+ goto out_suspend_again;
+
+err_endpoint_stop:
+ ipa_endpoint_stop(endpoint);
+out_suspend_again:
+ if (endpoint_suspended)
+ (void)ipa_endpoint_init_ctrl(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 db_enable;
+ 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.
+ *
+ * IPA v3.5.1 enables the doorbell engine. Newer versions do not.
+ */
+ db_enable = ipa->version == IPA_VERSION_3_5_1;
+ special = !endpoint->toward_ipa && endpoint->data->aggregation;
+ if (special && ipa_endpoint_aggr_active(endpoint))
+ ret = ipa_endpoint_reset_rx_aggr(endpoint);
+ else
+ gsi_channel_reset(&ipa->gsi, channel_id, db_enable);
+
+ if (ret)
+ dev_err(&ipa->pdev->dev,
+ "error %d resetting channel %u for endpoint %u\n",
+ ret, endpoint->channel_id, endpoint->endpoint_id);
+}
+
+static int ipa_endpoint_stop_rx_dma(struct ipa *ipa)
+{
+ u16 size = IPA_ENDPOINT_STOP_RX_SIZE;
+ struct gsi_trans *trans;
+ dma_addr_t addr;
+ int ret;
+
+ trans = ipa_cmd_trans_alloc(ipa, 1);
+ if (!trans) {
+ dev_err(&ipa->pdev->dev,
+ "no transaction for RX endpoint STOP workaround\n");
+ return -EBUSY;
+ }
+
+ /* Read into the highest part of the zero memory area */
+ addr = ipa->zero_addr + ipa->zero_size - size;
+
+ ipa_cmd_dma_task_32b_addr_add(trans, size, addr, false);
+
+ ret = gsi_trans_commit_wait_timeout(trans, ENDPOINT_STOP_DMA_TIMEOUT);
+ if (ret)
+ gsi_trans_free(trans);
+
+ return ret;
+}
+
+/**
+ * ipa_endpoint_stop() - Stops a GSI channel in IPA
+ * @client: Client whose endpoint should be stopped
+ *
+ * This function implements the sequence to stop a GSI channel
+ * in IPA. This function returns when the channel is is STOP state.
+ *
+ * Return value: 0 on success, negative otherwise
+ */
+int ipa_endpoint_stop(struct ipa_endpoint *endpoint)
+{
+ u32 retries = endpoint->toward_ipa ? 0 : IPA_ENDPOINT_STOP_RX_RETRIES;
+ int ret;
+
+ do {
+ struct ipa *ipa = endpoint->ipa;
+ struct gsi *gsi = &ipa->gsi;
+
+ ret = gsi_channel_stop(gsi, endpoint->channel_id);
+ if (ret != -EAGAIN)
+ break;
+
+ if (endpoint->toward_ipa)
+ continue;
+
+ /* For IPA v3.5.1, send a DMA read task and check again */
+ if (ipa->version == IPA_VERSION_3_5_1) {
+ ret = ipa_endpoint_stop_rx_dma(ipa);
+ if (ret)
+ break;
+ }
+
+ msleep(1);
+ } while (retries--);
+
+ return retries ? ret : -EIO;
+}
+
+static void ipa_endpoint_program(struct ipa_endpoint *endpoint)
+{
+ struct device *dev = &endpoint->ipa->pdev->dev;
+ int ret;
+
+ if (endpoint->toward_ipa) {
+ bool delay_mode = endpoint->data->tx.delay;
+
+ ret = ipa_endpoint_init_ctrl(endpoint, delay_mode);
+ /* Endpoint is expected to not be in delay mode */
+ if (!ret != delay_mode) {
+ dev_warn(dev,
+ "TX endpoint %u was %sin delay mode\n",
+ endpoint->endpoint_id,
+ delay_mode ? "already " : "");
+ }
+ ipa_endpoint_init_hdr_ext(endpoint);
+ ipa_endpoint_init_aggr(endpoint);
+ ipa_endpoint_init_deaggr(endpoint);
+ ipa_endpoint_init_seq(endpoint);
+ } else {
+ if (endpoint->ipa->version == IPA_VERSION_3_5_1) {
+ if (!ipa_endpoint_init_ctrl(endpoint, false))
+ dev_warn(dev,
+ "RX endpoint %u was suspended\n",
+ endpoint->endpoint_id);
+ }
+ ipa_endpoint_init_hdr_ext(endpoint);
+ ipa_endpoint_init_aggr(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);
+}
+
+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;
+ int ret;
+
+ if (!(endpoint->ipa->enabled & mask))
+ return;
+
+ endpoint->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 = ipa_endpoint_stop(endpoint);
+ if (ret)
+ dev_err(&ipa->pdev->dev,
+ "error %d attempting to stop endpoint %u\n", ret,
+ endpoint->endpoint_id);
+}
+
+/**
+ * ipa_endpoint_suspend_aggr() - Emulate suspend interrupt
+ * @endpoint_id: 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;
+
+ /* assert(ipa->version == IPA_VERSION_3_5_1); */
+
+ if (!endpoint->data->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);
+}
+
+void ipa_endpoint_suspend_one(struct ipa_endpoint *endpoint)
+{
+ struct device *dev = &endpoint->ipa->pdev->dev;
+ struct gsi *gsi = &endpoint->ipa->gsi;
+ bool stop_channel;
+ int ret;
+
+ if (!(endpoint->ipa->enabled & BIT(endpoint->endpoint_id)))
+ return;
+
+ if (!endpoint->toward_ipa)
+ ipa_endpoint_replenish_disable(endpoint);
+
+ /* IPA v3.5.1 doesn't use channel stop for suspend */
+ stop_channel = endpoint->ipa->version != IPA_VERSION_3_5_1;
+ if (!endpoint->toward_ipa && !stop_channel) {
+ /* Due to a hardware bug, a client suspended with an open
+ * aggregation frame will not generate a SUSPEND IPA
+ * interrupt. We work around this by force-closing the
+ * aggregation frame, then simulating the arrival of such
+ * an interrupt.
+ */
+ WARN_ON(ipa_endpoint_init_ctrl(endpoint, true));
+ ipa_endpoint_suspend_aggr(endpoint);
+ }
+
+ ret = gsi_channel_suspend(gsi, endpoint->channel_id, stop_channel);
+ 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;
+ bool start_channel;
+ int ret;
+
+ if (!(endpoint->ipa->enabled & BIT(endpoint->endpoint_id)))
+ return;
+
+ /* IPA v3.5.1 doesn't use channel start for resume */
+ start_channel = endpoint->ipa->version != IPA_VERSION_3_5_1;
+ if (!endpoint->toward_ipa && !start_channel)
+ WARN_ON(ipa_endpoint_init_ctrl(endpoint, false));
+
+ ret = gsi_channel_resume(gsi, endpoint->channel_id, start_channel);
+ 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->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)
+{
+ 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->trans_tre_max = gsi_channel_trans_tre_max(gsi, channel_id);
+ if (!endpoint->toward_ipa) {
+ /* RX transactions require a single TRE, so the maximum
+ * backlog is the same as the maximum outstanding TREs.
+ */
+ endpoint->replenish_enabled = false;
+ atomic_set(&endpoint->replenish_saved,
+ gsi_channel_tre_max(gsi, endpoint->channel_id));
+ atomic_set(&endpoint->replenish_backlog, 0);
+ 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;
+ u32 initialized;
+ u32 rx_base;
+ u32 rx_mask;
+ u32 tx_mask;
+ int ret = 0;
+ u32 max;
+ u32 val;
+
+ /* Find out about the endpoints supplied by the hardware, and ensure
+ * the highest one doesn't exceed the number we support.
+ */
+ val = ioread32(ipa->reg_virt + IPA_REG_FLAVOR_0_OFFSET);
+
+ /* Our RX is an IPA producer */
+ rx_base = u32_get_bits(val, BAM_PROD_LOWEST_FMASK);
+ max = rx_base + u32_get_bits(val, BAM_MAX_PROD_PIPES_FMASK);
+ 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 = u32_get_bits(val, BAM_MAX_CONS_PIPES_FMASK);
+ 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->seq_type = data->endpoint.seq_type;
+ endpoint->channel_id = data->channel_id;
+ endpoint->endpoint_id = data->endpoint_id;
+ endpoint->toward_ipa = data->toward_ipa;
+ endpoint->data = &data->endpoint.config;
+
+ ipa->initialized |= BIT(endpoint->endpoint_id);
+}
+
+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;
+
+ 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 (!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 */
+}
projects / mirror_ubuntu-jammy-kernel.git / commitdiff