--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020-21 Intel Corporation.
+ */
+
+#include "iosm_ipc_protocol.h"
+#include "iosm_ipc_protocol_ops.h"
+
+/* Get the next free message element.*/
+static union ipc_mem_msg_entry *
+ipc_protocol_free_msg_get(struct iosm_protocol *ipc_protocol, int *index)
+{
+ u32 head = le32_to_cpu(ipc_protocol->p_ap_shm->msg_head);
+ u32 new_head = (head + 1) % IPC_MEM_MSG_ENTRIES;
+ union ipc_mem_msg_entry *msg;
+
+ if (new_head == le32_to_cpu(ipc_protocol->p_ap_shm->msg_tail)) {
+ dev_err(ipc_protocol->dev, "message ring is full");
+ return NULL;
+ }
+
+ /* Get the pointer to the next free message element,
+ * reset the fields and mark is as invalid.
+ */
+ msg = &ipc_protocol->p_ap_shm->msg_ring[head];
+ memset(msg, 0, sizeof(*msg));
+
+ /* return index in message ring */
+ *index = head;
+
+ return msg;
+}
+
+/* Updates the message ring Head pointer */
+void ipc_protocol_msg_hp_update(struct iosm_imem *ipc_imem)
+{
+ struct iosm_protocol *ipc_protocol = ipc_imem->ipc_protocol;
+ u32 head = le32_to_cpu(ipc_protocol->p_ap_shm->msg_head);
+ u32 new_head = (head + 1) % IPC_MEM_MSG_ENTRIES;
+
+ /* Update head pointer and fire doorbell. */
+ ipc_protocol->p_ap_shm->msg_head = cpu_to_le32(new_head);
+ ipc_protocol->old_msg_tail =
+ le32_to_cpu(ipc_protocol->p_ap_shm->msg_tail);
+
+ ipc_pm_signal_hpda_doorbell(&ipc_protocol->pm, IPC_HP_MR, false);
+}
+
+/* Allocate and prepare a OPEN_PIPE message.
+ * This also allocates the memory for the new TDR structure and
+ * updates the pipe structure referenced in the preparation arguments.
+ */
+static int ipc_protocol_msg_prepipe_open(struct iosm_protocol *ipc_protocol,
+ union ipc_msg_prep_args *args)
+{
+ int index;
+ union ipc_mem_msg_entry *msg =
+ ipc_protocol_free_msg_get(ipc_protocol, &index);
+ struct ipc_pipe *pipe = args->pipe_open.pipe;
+ struct ipc_protocol_td *tdr;
+ struct sk_buff **skbr;
+
+ if (!msg) {
+ dev_err(ipc_protocol->dev, "failed to get free message");
+ return -EIO;
+ }
+
+ /* Allocate the skbuf elements for the skbuf which are on the way.
+ * SKB ring is internal memory allocation for driver. No need to
+ * re-calculate the start and end addresses.
+ */
+ skbr = kcalloc(pipe->nr_of_entries, sizeof(*skbr), GFP_ATOMIC);
+ if (!skbr)
+ return -ENOMEM;
+
+ /* Allocate the transfer descriptors for the pipe. */
+ tdr = pci_alloc_consistent(ipc_protocol->pcie->pci,
+ pipe->nr_of_entries * sizeof(*tdr),
+ &pipe->phy_tdr_start);
+ if (!tdr) {
+ kfree(skbr);
+ dev_err(ipc_protocol->dev, "tdr alloc error");
+ return -ENOMEM;
+ }
+
+ pipe->max_nr_of_queued_entries = pipe->nr_of_entries - 1;
+ pipe->nr_of_queued_entries = 0;
+ pipe->tdr_start = tdr;
+ pipe->skbr_start = skbr;
+ pipe->old_tail = 0;
+
+ ipc_protocol->p_ap_shm->head_array[pipe->pipe_nr] = 0;
+
+ msg->open_pipe.type_of_message = IPC_MEM_MSG_OPEN_PIPE;
+ msg->open_pipe.pipe_nr = pipe->pipe_nr;
+ msg->open_pipe.tdr_addr = cpu_to_le64(pipe->phy_tdr_start);
+ msg->open_pipe.tdr_entries = cpu_to_le16(pipe->nr_of_entries);
+ msg->open_pipe.accumulation_backoff =
+ cpu_to_le32(pipe->accumulation_backoff);
+ msg->open_pipe.irq_vector = cpu_to_le32(pipe->irq);
+
+ return index;
+}
+
+static int ipc_protocol_msg_prepipe_close(struct iosm_protocol *ipc_protocol,
+ union ipc_msg_prep_args *args)
+{
+ int index = -1;
+ union ipc_mem_msg_entry *msg =
+ ipc_protocol_free_msg_get(ipc_protocol, &index);
+ struct ipc_pipe *pipe = args->pipe_close.pipe;
+
+ if (!msg)
+ return -EIO;
+
+ msg->close_pipe.type_of_message = IPC_MEM_MSG_CLOSE_PIPE;
+ msg->close_pipe.pipe_nr = pipe->pipe_nr;
+
+ dev_dbg(ipc_protocol->dev, "IPC_MEM_MSG_CLOSE_PIPE(pipe_nr=%d)",
+ msg->close_pipe.pipe_nr);
+
+ return index;
+}
+
+static int ipc_protocol_msg_prep_sleep(struct iosm_protocol *ipc_protocol,
+ union ipc_msg_prep_args *args)
+{
+ int index = -1;
+ union ipc_mem_msg_entry *msg =
+ ipc_protocol_free_msg_get(ipc_protocol, &index);
+
+ if (!msg) {
+ dev_err(ipc_protocol->dev, "failed to get free message");
+ return -EIO;
+ }
+
+ /* Prepare and send the host sleep message to CP to enter or exit D3. */
+ msg->host_sleep.type_of_message = IPC_MEM_MSG_SLEEP;
+ msg->host_sleep.target = args->sleep.target; /* 0=host, 1=device */
+
+ /* state; 0=enter, 1=exit 2=enter w/o protocol */
+ msg->host_sleep.state = args->sleep.state;
+
+ dev_dbg(ipc_protocol->dev, "IPC_MEM_MSG_SLEEP(target=%d; state=%d)",
+ msg->host_sleep.target, msg->host_sleep.state);
+
+ return index;
+}
+
+static int ipc_protocol_msg_prep_feature_set(struct iosm_protocol *ipc_protocol,
+ union ipc_msg_prep_args *args)
+{
+ int index = -1;
+ union ipc_mem_msg_entry *msg =
+ ipc_protocol_free_msg_get(ipc_protocol, &index);
+
+ if (!msg) {
+ dev_err(ipc_protocol->dev, "failed to get free message");
+ return -EIO;
+ }
+
+ msg->feature_set.type_of_message = IPC_MEM_MSG_FEATURE_SET;
+ msg->feature_set.reset_enable = args->feature_set.reset_enable <<
+ RESET_BIT;
+
+ dev_dbg(ipc_protocol->dev, "IPC_MEM_MSG_FEATURE_SET(reset_enable=%d)",
+ msg->feature_set.reset_enable >> RESET_BIT);
+
+ return index;
+}
+
+/* Processes the message consumed by CP. */
+bool ipc_protocol_msg_process(struct iosm_imem *ipc_imem, int irq)
+{
+ struct iosm_protocol *ipc_protocol = ipc_imem->ipc_protocol;
+ struct ipc_rsp **rsp_ring = ipc_protocol->rsp_ring;
+ bool msg_processed = false;
+ u32 i;
+
+ if (le32_to_cpu(ipc_protocol->p_ap_shm->msg_tail) >=
+ IPC_MEM_MSG_ENTRIES) {
+ dev_err(ipc_protocol->dev, "msg_tail out of range: %d",
+ le32_to_cpu(ipc_protocol->p_ap_shm->msg_tail));
+ return msg_processed;
+ }
+
+ if (irq != IMEM_IRQ_DONT_CARE &&
+ irq != ipc_protocol->p_ap_shm->ci.msg_irq_vector)
+ return msg_processed;
+
+ for (i = ipc_protocol->old_msg_tail;
+ i != le32_to_cpu(ipc_protocol->p_ap_shm->msg_tail);
+ i = (i + 1) % IPC_MEM_MSG_ENTRIES) {
+ union ipc_mem_msg_entry *msg =
+ &ipc_protocol->p_ap_shm->msg_ring[i];
+
+ dev_dbg(ipc_protocol->dev, "msg[%d]: type=%u status=%d", i,
+ msg->common.type_of_message,
+ msg->common.completion_status);
+
+ /* Update response with status and wake up waiting requestor */
+ if (rsp_ring[i]) {
+ rsp_ring[i]->status =
+ le32_to_cpu(msg->common.completion_status);
+ complete(&rsp_ring[i]->completion);
+ rsp_ring[i] = NULL;
+ }
+ msg_processed = true;
+ }
+
+ ipc_protocol->old_msg_tail = i;
+ return msg_processed;
+}
+
+/* Sends data from UL list to CP for the provided pipe by updating the Head
+ * pointer of given pipe.
+ */
+bool ipc_protocol_ul_td_send(struct iosm_protocol *ipc_protocol,
+ struct ipc_pipe *pipe,
+ struct sk_buff_head *p_ul_list)
+{
+ struct ipc_protocol_td *td;
+ bool hpda_pending = false;
+ struct sk_buff *skb;
+ s32 free_elements;
+ u32 head;
+ u32 tail;
+
+ if (!ipc_protocol->p_ap_shm) {
+ dev_err(ipc_protocol->dev, "driver is not initialized");
+ return false;
+ }
+
+ /* Get head and tail of the td list and calculate
+ * the number of free elements.
+ */
+ head = le32_to_cpu(ipc_protocol->p_ap_shm->head_array[pipe->pipe_nr]);
+ tail = pipe->old_tail;
+
+ while (!skb_queue_empty(p_ul_list)) {
+ if (head < tail)
+ free_elements = tail - head - 1;
+ else
+ free_elements =
+ pipe->nr_of_entries - head + ((s32)tail - 1);
+
+ if (free_elements <= 0) {
+ dev_dbg(ipc_protocol->dev,
+ "no free td elements for UL pipe %d",
+ pipe->pipe_nr);
+ break;
+ }
+
+ /* Get the td address. */
+ td = &pipe->tdr_start[head];
+
+ /* Take the first element of the uplink list and add it
+ * to the td list.
+ */
+ skb = skb_dequeue(p_ul_list);
+ if (WARN_ON(!skb))
+ break;
+
+ /* Save the reference to the uplink skbuf. */
+ pipe->skbr_start[head] = skb;
+
+ td->buffer.address = IPC_CB(skb)->mapping;
+ td->scs = cpu_to_le32(skb->len) & cpu_to_le32(SIZE_MASK);
+ td->next = 0;
+
+ pipe->nr_of_queued_entries++;
+
+ /* Calculate the new head and save it. */
+ head++;
+ if (head >= pipe->nr_of_entries)
+ head = 0;
+
+ ipc_protocol->p_ap_shm->head_array[pipe->pipe_nr] =
+ cpu_to_le32(head);
+ }
+
+ if (pipe->old_head != head) {
+ dev_dbg(ipc_protocol->dev, "New UL TDs Pipe:%d", pipe->pipe_nr);
+
+ pipe->old_head = head;
+ /* Trigger doorbell because of pending UL packets. */
+ hpda_pending = true;
+ }
+
+ return hpda_pending;
+}
+
+/* Checks for Tail pointer update from CP and returns the data as SKB. */
+struct sk_buff *ipc_protocol_ul_td_process(struct iosm_protocol *ipc_protocol,
+ struct ipc_pipe *pipe)
+{
+ struct ipc_protocol_td *p_td = &pipe->tdr_start[pipe->old_tail];
+ struct sk_buff *skb = pipe->skbr_start[pipe->old_tail];
+
+ pipe->nr_of_queued_entries--;
+ pipe->old_tail++;
+ if (pipe->old_tail >= pipe->nr_of_entries)
+ pipe->old_tail = 0;
+
+ if (!p_td->buffer.address) {
+ dev_err(ipc_protocol->dev, "Td buffer address is NULL");
+ return NULL;
+ }
+
+ if (p_td->buffer.address != IPC_CB(skb)->mapping) {
+ dev_err(ipc_protocol->dev,
+ "pipe %d: invalid buf_addr or skb_data",
+ pipe->pipe_nr);
+ return NULL;
+ }
+
+ return skb;
+}
+
+/* Allocates an SKB for CP to send data and updates the Head Pointer
+ * of the given Pipe#.
+ */
+bool ipc_protocol_dl_td_prepare(struct iosm_protocol *ipc_protocol,
+ struct ipc_pipe *pipe)
+{
+ struct ipc_protocol_td *td;
+ dma_addr_t mapping = 0;
+ u32 head, new_head;
+ struct sk_buff *skb;
+ u32 tail;
+
+ /* Get head and tail of the td list and calculate
+ * the number of free elements.
+ */
+ head = le32_to_cpu(ipc_protocol->p_ap_shm->head_array[pipe->pipe_nr]);
+ tail = le32_to_cpu(ipc_protocol->p_ap_shm->tail_array[pipe->pipe_nr]);
+
+ new_head = head + 1;
+ if (new_head >= pipe->nr_of_entries)
+ new_head = 0;
+
+ if (new_head == tail)
+ return false;
+
+ /* Get the td address. */
+ td = &pipe->tdr_start[head];
+
+ /* Allocate the skbuf for the descriptor. */
+ skb = ipc_pcie_alloc_skb(ipc_protocol->pcie, pipe->buf_size, GFP_ATOMIC,
+ &mapping, DMA_FROM_DEVICE,
+ IPC_MEM_DL_ETH_OFFSET);
+ if (!skb)
+ return false;
+
+ td->buffer.address = mapping;
+ td->scs = cpu_to_le32(pipe->buf_size) & cpu_to_le32(SIZE_MASK);
+ td->next = 0;
+
+ /* store the new head value. */
+ ipc_protocol->p_ap_shm->head_array[pipe->pipe_nr] =
+ cpu_to_le32(new_head);
+
+ /* Save the reference to the skbuf. */
+ pipe->skbr_start[head] = skb;
+
+ pipe->nr_of_queued_entries++;
+
+ return true;
+}
+
+/* Processes DL TD's */
+struct sk_buff *ipc_protocol_dl_td_process(struct iosm_protocol *ipc_protocol,
+ struct ipc_pipe *pipe)
+{
+ u32 tail =
+ le32_to_cpu(ipc_protocol->p_ap_shm->tail_array[pipe->pipe_nr]);
+ struct ipc_protocol_td *p_td;
+ struct sk_buff *skb;
+
+ if (!pipe->tdr_start)
+ return NULL;
+
+ /* Copy the reference to the downlink buffer. */
+ p_td = &pipe->tdr_start[pipe->old_tail];
+ skb = pipe->skbr_start[pipe->old_tail];
+
+ /* Reset the ring elements. */
+ pipe->skbr_start[pipe->old_tail] = NULL;
+
+ pipe->nr_of_queued_entries--;
+
+ pipe->old_tail++;
+ if (pipe->old_tail >= pipe->nr_of_entries)
+ pipe->old_tail = 0;
+
+ if (!skb) {
+ dev_err(ipc_protocol->dev, "skb is null");
+ goto ret;
+ } else if (!p_td->buffer.address) {
+ dev_err(ipc_protocol->dev, "td/buffer address is null");
+ ipc_pcie_kfree_skb(ipc_protocol->pcie, skb);
+ skb = NULL;
+ goto ret;
+ }
+
+ if (!IPC_CB(skb)) {
+ dev_err(ipc_protocol->dev, "pipe# %d, tail: %d skb_cb is NULL",
+ pipe->pipe_nr, tail);
+ ipc_pcie_kfree_skb(ipc_protocol->pcie, skb);
+ skb = NULL;
+ goto ret;
+ }
+
+ if (p_td->buffer.address != IPC_CB(skb)->mapping) {
+ dev_err(ipc_protocol->dev, "invalid buf=%p or skb=%p",
+ (void *)p_td->buffer.address, skb->data);
+ ipc_pcie_kfree_skb(ipc_protocol->pcie, skb);
+ skb = NULL;
+ goto ret;
+ } else if ((le32_to_cpu(p_td->scs) & SIZE_MASK) > pipe->buf_size) {
+ dev_err(ipc_protocol->dev, "invalid buffer size %d > %d",
+ le32_to_cpu(p_td->scs) & SIZE_MASK,
+ pipe->buf_size);
+ ipc_pcie_kfree_skb(ipc_protocol->pcie, skb);
+ skb = NULL;
+ goto ret;
+ } else if (le32_to_cpu(p_td->scs) >> COMPLETION_STATUS ==
+ IPC_MEM_TD_CS_ABORT) {
+ /* Discard aborted buffers. */
+ dev_dbg(ipc_protocol->dev, "discard 'aborted' buffers");
+ ipc_pcie_kfree_skb(ipc_protocol->pcie, skb);
+ skb = NULL;
+ goto ret;
+ }
+
+ /* Set the length field in skbuf. */
+ skb_put(skb, le32_to_cpu(p_td->scs) & SIZE_MASK);
+
+ret:
+ return skb;
+}
+
+void ipc_protocol_get_head_tail_index(struct iosm_protocol *ipc_protocol,
+ struct ipc_pipe *pipe, u32 *head,
+ u32 *tail)
+{
+ struct ipc_protocol_ap_shm *ipc_ap_shm = ipc_protocol->p_ap_shm;
+
+ if (head)
+ *head = le32_to_cpu(ipc_ap_shm->head_array[pipe->pipe_nr]);
+
+ if (tail)
+ *tail = le32_to_cpu(ipc_ap_shm->tail_array[pipe->pipe_nr]);
+}
+
+/* Frees the TDs given to CP. */
+void ipc_protocol_pipe_cleanup(struct iosm_protocol *ipc_protocol,
+ struct ipc_pipe *pipe)
+{
+ struct sk_buff *skb;
+ u32 head;
+ u32 tail;
+
+ /* Get the start and the end of the buffer list. */
+ head = le32_to_cpu(ipc_protocol->p_ap_shm->head_array[pipe->pipe_nr]);
+ tail = pipe->old_tail;
+
+ /* Reset tail and head to 0. */
+ ipc_protocol->p_ap_shm->tail_array[pipe->pipe_nr] = 0;
+ ipc_protocol->p_ap_shm->head_array[pipe->pipe_nr] = 0;
+
+ /* Free pending uplink and downlink buffers. */
+ if (pipe->skbr_start) {
+ while (head != tail) {
+ /* Get the reference to the skbuf,
+ * which is on the way and free it.
+ */
+ skb = pipe->skbr_start[tail];
+ if (skb)
+ ipc_pcie_kfree_skb(ipc_protocol->pcie, skb);
+
+ tail++;
+ if (tail >= pipe->nr_of_entries)
+ tail = 0;
+ }
+
+ kfree(pipe->skbr_start);
+ pipe->skbr_start = NULL;
+ }
+
+ pipe->old_tail = 0;
+
+ /* Free and reset the td and skbuf circular buffers. kfree is save! */
+ if (pipe->tdr_start) {
+ pci_free_consistent(ipc_protocol->pcie->pci,
+ sizeof(*pipe->tdr_start) *
+ pipe->nr_of_entries,
+ pipe->tdr_start, pipe->phy_tdr_start);
+
+ pipe->tdr_start = NULL;
+ }
+}
+
+enum ipc_mem_device_ipc_state ipc_protocol_get_ipc_status(struct iosm_protocol
+ *ipc_protocol)
+{
+ return (enum ipc_mem_device_ipc_state)
+ le32_to_cpu(ipc_protocol->p_ap_shm->device_info.ipc_status);
+}
+
+enum ipc_mem_exec_stage
+ipc_protocol_get_ap_exec_stage(struct iosm_protocol *ipc_protocol)
+{
+ return le32_to_cpu(ipc_protocol->p_ap_shm->device_info.execution_stage);
+}
+
+int ipc_protocol_msg_prep(struct iosm_imem *ipc_imem,
+ enum ipc_msg_prep_type msg_type,
+ union ipc_msg_prep_args *args)
+{
+ struct iosm_protocol *ipc_protocol = ipc_imem->ipc_protocol;
+
+ switch (msg_type) {
+ case IPC_MSG_PREP_SLEEP:
+ return ipc_protocol_msg_prep_sleep(ipc_protocol, args);
+
+ case IPC_MSG_PREP_PIPE_OPEN:
+ return ipc_protocol_msg_prepipe_open(ipc_protocol, args);
+
+ case IPC_MSG_PREP_PIPE_CLOSE:
+ return ipc_protocol_msg_prepipe_close(ipc_protocol, args);
+
+ case IPC_MSG_PREP_FEATURE_SET:
+ return ipc_protocol_msg_prep_feature_set(ipc_protocol, args);
+
+ /* Unsupported messages in protocol */
+ case IPC_MSG_PREP_MAP:
+ case IPC_MSG_PREP_UNMAP:
+ default:
+ dev_err(ipc_protocol->dev,
+ "unsupported message type: %d in protocol", msg_type);
+ return -EINVAL;
+ }
+}
+
+u32
+ipc_protocol_pm_dev_get_sleep_notification(struct iosm_protocol *ipc_protocol)
+{
+ struct ipc_protocol_ap_shm *ipc_ap_shm = ipc_protocol->p_ap_shm;
+
+ return le32_to_cpu(ipc_ap_shm->device_info.device_sleep_notification);
+}
--- /dev/null
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (C) 2020-21 Intel Corporation.
+ */
+
+#ifndef IOSM_IPC_PROTOCOL_OPS_H
+#define IOSM_IPC_PROTOCOL_OPS_H
+
+#define SIZE_MASK 0x00FFFFFF
+#define COMPLETION_STATUS 24
+#define RESET_BIT 7
+
+/**
+ * enum ipc_mem_td_cs - Completion status of a TD
+ * @IPC_MEM_TD_CS_INVALID: Initial status - td not yet used.
+ * @IPC_MEM_TD_CS_PARTIAL_TRANSFER: More data pending -> next TD used for this
+ * @IPC_MEM_TD_CS_END_TRANSFER: IO transfer is complete.
+ * @IPC_MEM_TD_CS_OVERFLOW: IO transfer to small for the buff to write
+ * @IPC_MEM_TD_CS_ABORT: TD marked as abort and shall be discarded
+ * by AP.
+ * @IPC_MEM_TD_CS_ERROR: General error.
+ */
+enum ipc_mem_td_cs {
+ IPC_MEM_TD_CS_INVALID,
+ IPC_MEM_TD_CS_PARTIAL_TRANSFER,
+ IPC_MEM_TD_CS_END_TRANSFER,
+ IPC_MEM_TD_CS_OVERFLOW,
+ IPC_MEM_TD_CS_ABORT,
+ IPC_MEM_TD_CS_ERROR,
+};
+
+/**
+ * enum ipc_mem_msg_cs - Completion status of IPC Message
+ * @IPC_MEM_MSG_CS_INVALID: Initial status.
+ * @IPC_MEM_MSG_CS_SUCCESS: IPC Message completion success.
+ * @IPC_MEM_MSG_CS_ERROR: Message send error.
+ */
+enum ipc_mem_msg_cs {
+ IPC_MEM_MSG_CS_INVALID,
+ IPC_MEM_MSG_CS_SUCCESS,
+ IPC_MEM_MSG_CS_ERROR,
+};
+
+/**
+ * struct ipc_msg_prep_args_pipe - struct for pipe args for message preparation
+ * @pipe: Pipe to open/close
+ */
+struct ipc_msg_prep_args_pipe {
+ struct ipc_pipe *pipe;
+};
+
+/**
+ * struct ipc_msg_prep_args_sleep - struct for sleep args for message
+ * preparation
+ * @target: 0=host, 1=device
+ * @state: 0=enter sleep, 1=exit sleep
+ */
+struct ipc_msg_prep_args_sleep {
+ unsigned int target;
+ unsigned int state;
+};
+
+/**
+ * struct ipc_msg_prep_feature_set - struct for feature set argument for
+ * message preparation
+ * @reset_enable: 0=out-of-band, 1=in-band-crash notification
+ */
+struct ipc_msg_prep_feature_set {
+ u8 reset_enable;
+};
+
+/**
+ * struct ipc_msg_prep_map - struct for map argument for message preparation
+ * @region_id: Region to map
+ * @addr: Pcie addr of region to map
+ * @size: Size of the region to map
+ */
+struct ipc_msg_prep_map {
+ unsigned int region_id;
+ unsigned long addr;
+ size_t size;
+};
+
+/**
+ * struct ipc_msg_prep_unmap - struct for unmap argument for message preparation
+ * @region_id: Region to unmap
+ */
+struct ipc_msg_prep_unmap {
+ unsigned int region_id;
+};
+
+/**
+ * struct ipc_msg_prep_args - Union to handle different message types
+ * @pipe_open: Pipe open message preparation struct
+ * @pipe_close: Pipe close message preparation struct
+ * @sleep: Sleep message preparation struct
+ * @feature_set: Feature set message preparation struct
+ * @map: Memory map message preparation struct
+ * @unmap: Memory unmap message preparation struct
+ */
+union ipc_msg_prep_args {
+ struct ipc_msg_prep_args_pipe pipe_open;
+ struct ipc_msg_prep_args_pipe pipe_close;
+ struct ipc_msg_prep_args_sleep sleep;
+ struct ipc_msg_prep_feature_set feature_set;
+ struct ipc_msg_prep_map map;
+ struct ipc_msg_prep_unmap unmap;
+};
+
+/**
+ * enum ipc_msg_prep_type - Enum for message prepare actions
+ * @IPC_MSG_PREP_SLEEP: Sleep message preparation type
+ * @IPC_MSG_PREP_PIPE_OPEN: Pipe open message preparation type
+ * @IPC_MSG_PREP_PIPE_CLOSE: Pipe close message preparation type
+ * @IPC_MSG_PREP_FEATURE_SET: Feature set message preparation type
+ * @IPC_MSG_PREP_MAP: Memory map message preparation type
+ * @IPC_MSG_PREP_UNMAP: Memory unmap message preparation type
+ */
+enum ipc_msg_prep_type {
+ IPC_MSG_PREP_SLEEP,
+ IPC_MSG_PREP_PIPE_OPEN,
+ IPC_MSG_PREP_PIPE_CLOSE,
+ IPC_MSG_PREP_FEATURE_SET,
+ IPC_MSG_PREP_MAP,
+ IPC_MSG_PREP_UNMAP,
+};
+
+/**
+ * struct ipc_rsp - Response to sent message
+ * @completion: For waking up requestor
+ * @status: Completion status
+ */
+struct ipc_rsp {
+ struct completion completion;
+ enum ipc_mem_msg_cs status;
+};
+
+/**
+ * enum ipc_mem_msg - Type-definition of the messages.
+ * @IPC_MEM_MSG_OPEN_PIPE: AP ->CP: Open a pipe
+ * @IPC_MEM_MSG_CLOSE_PIPE: AP ->CP: Close a pipe
+ * @IPC_MEM_MSG_ABORT_PIPE: AP ->CP: wait for completion of the
+ * running transfer and abort all pending
+ * IO-transfers for the pipe
+ * @IPC_MEM_MSG_SLEEP: AP ->CP: host enter or exit sleep
+ * @IPC_MEM_MSG_FEATURE_SET: AP ->CP: Intel feature configuration
+ */
+enum ipc_mem_msg {
+ IPC_MEM_MSG_OPEN_PIPE = 0x01,
+ IPC_MEM_MSG_CLOSE_PIPE = 0x02,
+ IPC_MEM_MSG_ABORT_PIPE = 0x03,
+ IPC_MEM_MSG_SLEEP = 0x04,
+ IPC_MEM_MSG_FEATURE_SET = 0xF0,
+};
+
+/**
+ * struct ipc_mem_msg_open_pipe - Message structure for open pipe
+ * @tdr_addr: Tdr address
+ * @tdr_entries: Tdr entries
+ * @pipe_nr: Pipe number
+ * @type_of_message: Message type
+ * @irq_vector: MSI vector number
+ * @accumulation_backoff: Time in usec for data accumalation
+ * @completion_status: Message Completion Status
+ */
+struct ipc_mem_msg_open_pipe {
+ __le64 tdr_addr;
+ __le16 tdr_entries;
+ u8 pipe_nr;
+ u8 type_of_message;
+ __le32 irq_vector;
+ __le32 accumulation_backoff;
+ __le32 completion_status;
+};
+
+/**
+ * struct ipc_mem_msg_close_pipe - Message structure for close pipe
+ * @reserved1: Reserved
+ * @reserved2: Reserved
+ * @pipe_nr: Pipe number
+ * @type_of_message: Message type
+ * @reserved3: Reserved
+ * @reserved4: Reserved
+ * @completion_status: Message Completion Status
+ */
+struct ipc_mem_msg_close_pipe {
+ __le32 reserved1[2];
+ __le16 reserved2;
+ u8 pipe_nr;
+ u8 type_of_message;
+ __le32 reserved3;
+ __le32 reserved4;
+ __le32 completion_status;
+};
+
+/**
+ * struct ipc_mem_msg_abort_pipe - Message structure for abort pipe
+ * @reserved1: Reserved
+ * @reserved2: Reserved
+ * @pipe_nr: Pipe number
+ * @type_of_message: Message type
+ * @reserved3: Reserved
+ * @reserved4: Reserved
+ * @completion_status: Message Completion Status
+ */
+struct ipc_mem_msg_abort_pipe {
+ __le32 reserved1[2];
+ __le16 reserved2;
+ u8 pipe_nr;
+ u8 type_of_message;
+ __le32 reserved3;
+ __le32 reserved4;
+ __le32 completion_status;
+};
+
+/**
+ * struct ipc_mem_msg_host_sleep - Message structure for sleep message.
+ * @reserved1: Reserved
+ * @target: 0=host, 1=device, host or EP devie
+ * is the message target
+ * @state: 0=enter sleep, 1=exit sleep,
+ * 2=enter sleep no protocol
+ * @reserved2: Reserved
+ * @type_of_message: Message type
+ * @reserved3: Reserved
+ * @reserved4: Reserved
+ * @completion_status: Message Completion Status
+ */
+struct ipc_mem_msg_host_sleep {
+ __le32 reserved1[2];
+ u8 target;
+ u8 state;
+ u8 reserved2;
+ u8 type_of_message;
+ __le32 reserved3;
+ __le32 reserved4;
+ __le32 completion_status;
+};
+
+/**
+ * struct ipc_mem_msg_feature_set - Message structure for feature_set message
+ * @reserved1: Reserved
+ * @reserved2: Reserved
+ * @reset_enable: 0=out-of-band, 1=in-band-crash notification
+ * @type_of_message: Message type
+ * @reserved3: Reserved
+ * @reserved4: Reserved
+ * @completion_status: Message Completion Status
+ */
+struct ipc_mem_msg_feature_set {
+ __le32 reserved1[2];
+ __le16 reserved2;
+ u8 reset_enable;
+ u8 type_of_message;
+ __le32 reserved3;
+ __le32 reserved4;
+ __le32 completion_status;
+};
+
+/**
+ * struct ipc_mem_msg_common - Message structure for completion status update.
+ * @reserved1: Reserved
+ * @reserved2: Reserved
+ * @type_of_message: Message type
+ * @reserved3: Reserved
+ * @reserved4: Reserved
+ * @completion_status: Message Completion Status
+ */
+struct ipc_mem_msg_common {
+ __le32 reserved1[2];
+ u8 reserved2[3];
+ u8 type_of_message;
+ __le32 reserved3;
+ __le32 reserved4;
+ __le32 completion_status;
+};
+
+/**
+ * union ipc_mem_msg_entry - Union with all possible messages.
+ * @open_pipe: Open pipe message struct
+ * @close_pipe: Close pipe message struct
+ * @abort_pipe: Abort pipe message struct
+ * @host_sleep: Host sleep message struct
+ * @feature_set: Featuer set message struct
+ * @common: Used to access msg_type and to set the completion status
+ */
+union ipc_mem_msg_entry {
+ struct ipc_mem_msg_open_pipe open_pipe;
+ struct ipc_mem_msg_close_pipe close_pipe;
+ struct ipc_mem_msg_abort_pipe abort_pipe;
+ struct ipc_mem_msg_host_sleep host_sleep;
+ struct ipc_mem_msg_feature_set feature_set;
+ struct ipc_mem_msg_common common;
+};
+
+/* Transfer descriptor definition. */
+struct ipc_protocol_td {
+ union {
+ /* 0 : 63 - 64-bit address of a buffer in host memory. */
+ dma_addr_t address;
+ struct {
+ /* 0 : 31 - 32 bit address */
+ __le32 address;
+ /* 32 : 63 - corresponding descriptor */
+ __le32 desc;
+ } __packed shm;
+ } buffer;
+
+ /* 0 - 2nd byte - Size of the buffer.
+ * The host provides the size of the buffer queued.
+ * The EP device reads this value and shall update
+ * it for downlink transfers to indicate the
+ * amount of data written in buffer.
+ * 3rd byte - This field provides the completion status
+ * of the TD. When queuing the TD, the host sets
+ * the status to 0. The EP device updates this
+ * field when completing the TD.
+ */
+ __le32 scs;
+
+ /* 0th - nr of following descriptors
+ * 1 - 3rd byte - reserved
+ */
+ __le32 next;
+} __packed;
+
+/**
+ * ipc_protocol_msg_prep - Prepare message based upon message type
+ * @ipc_imem: iosm_protocol instance
+ * @msg_type: message prepare type
+ * @args: message arguments
+ *
+ * Return: 0 on success and failure value on error
+ */
+int ipc_protocol_msg_prep(struct iosm_imem *ipc_imem,
+ enum ipc_msg_prep_type msg_type,
+ union ipc_msg_prep_args *args);
+
+/**
+ * ipc_protocol_msg_hp_update - Function for head pointer update
+ * of message ring
+ * @ipc_imem: iosm_protocol instance
+ */
+void ipc_protocol_msg_hp_update(struct iosm_imem *ipc_imem);
+
+/**
+ * ipc_protocol_msg_process - Function for processing responses
+ * to IPC messages
+ * @ipc_imem: iosm_protocol instance
+ * @irq: IRQ vector
+ *
+ * Return: True on success, false if error
+ */
+bool ipc_protocol_msg_process(struct iosm_imem *ipc_imem, int irq);
+
+/**
+ * ipc_protocol_ul_td_send - Function for sending the data to CP
+ * @ipc_protocol: iosm_protocol instance
+ * @pipe: Pipe instance
+ * @p_ul_list: uplink sk_buff list
+ *
+ * Return: true in success, false in case of error
+ */
+bool ipc_protocol_ul_td_send(struct iosm_protocol *ipc_protocol,
+ struct ipc_pipe *pipe,
+ struct sk_buff_head *p_ul_list);
+
+/**
+ * ipc_protocol_ul_td_process - Function for processing the sent data
+ * @ipc_protocol: iosm_protocol instance
+ * @pipe: Pipe instance
+ *
+ * Return: sk_buff instance
+ */
+struct sk_buff *ipc_protocol_ul_td_process(struct iosm_protocol *ipc_protocol,
+ struct ipc_pipe *pipe);
+
+/**
+ * ipc_protocol_dl_td_prepare - Function for providing DL TDs to CP
+ * @ipc_protocol: iosm_protocol instance
+ * @pipe: Pipe instance
+ *
+ * Return: true in success, false in case of error
+ */
+bool ipc_protocol_dl_td_prepare(struct iosm_protocol *ipc_protocol,
+ struct ipc_pipe *pipe);
+
+/**
+ * ipc_protocol_dl_td_process - Function for processing the DL data
+ * @ipc_protocol: iosm_protocol instance
+ * @pipe: Pipe instance
+ *
+ * Return: sk_buff instance
+ */
+struct sk_buff *ipc_protocol_dl_td_process(struct iosm_protocol *ipc_protocol,
+ struct ipc_pipe *pipe);
+
+/**
+ * ipc_protocol_get_head_tail_index - Function for getting Head and Tail
+ * pointer index of given pipe
+ * @ipc_protocol: iosm_protocol instance
+ * @pipe: Pipe Instance
+ * @head: head pointer index of the given pipe
+ * @tail: tail pointer index of the given pipe
+ */
+void ipc_protocol_get_head_tail_index(struct iosm_protocol *ipc_protocol,
+ struct ipc_pipe *pipe, u32 *head,
+ u32 *tail);
+/**
+ * ipc_protocol_get_ipc_status - Function for getting the IPC Status
+ * @ipc_protocol: iosm_protocol instance
+ *
+ * Return: Returns IPC State
+ */
+enum ipc_mem_device_ipc_state ipc_protocol_get_ipc_status(struct iosm_protocol
+ *ipc_protocol);
+
+/**
+ * ipc_protocol_pipe_cleanup - Function to cleanup pipe resources
+ * @ipc_protocol: iosm_protocol instance
+ * @pipe: Pipe instance
+ */
+void ipc_protocol_pipe_cleanup(struct iosm_protocol *ipc_protocol,
+ struct ipc_pipe *pipe);
+
+/**
+ * ipc_protocol_get_ap_exec_stage - Function for getting AP Exec Stage
+ * @ipc_protocol: pointer to struct iosm protocol
+ *
+ * Return: returns BOOT Stages
+ */
+enum ipc_mem_exec_stage
+ipc_protocol_get_ap_exec_stage(struct iosm_protocol *ipc_protocol);
+
+/**
+ * ipc_protocol_pm_dev_get_sleep_notification - Function for getting Dev Sleep
+ * notification
+ * @ipc_protocol: iosm_protocol instance
+ *
+ * Return: Returns dev PM State
+ */
+u32 ipc_protocol_pm_dev_get_sleep_notification(struct iosm_protocol
+ *ipc_protocol);
+#endif
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