new file mode 100644
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+/*
+ * sst_ipc.c - Intel SST Driver for audio engine
+ *
+ * Copyright (C) 2008-14 Intel Corporation
+ * Authors: Vinod Koul <vinod.koul@intel.com>
+ * Harsha Priya <priya.harsha@intel.com>
+ * Dharageswari R <dharageswari.r@intel.com>
+ * KP Jeeja <jeeja.kp@intel.com>
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+#include <linux/pci.h>
+#include <linux/firmware.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <linux/pm_runtime.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+#include <sound/compress_driver.h>
+#include <asm/intel-mid.h>
+#include <asm/platform_sst_audio.h>
+#include "../sst-mfld-platform.h"
+#include "sst.h"
+#include "../sst-dsp.h"
+
+struct sst_block *sst_create_block(struct intel_sst_drv *ctx,
+ u32 msg_id, u32 drv_id)
+{
+ struct sst_block *msg = NULL;
+
+ dev_dbg(ctx->dev, "Enter\n");
+ msg = kzalloc(sizeof(*msg), GFP_KERNEL);
+ if (!msg)
+ return NULL;
+ msg->condition = false;
+ msg->on = true;
+ msg->msg_id = msg_id;
+ msg->drv_id = drv_id;
+ spin_lock_bh(&ctx->block_lock);
+ list_add_tail(&msg->node, &ctx->block_list);
+ spin_unlock_bh(&ctx->block_lock);
+
+ return msg;
+}
+
+int sst_wake_up_block(struct intel_sst_drv *ctx, int result,
+ u32 drv_id, u32 ipc, void *data, u32 size)
+{
+ struct sst_block *block = NULL;
+
+ dev_dbg(ctx->dev, "Enter\n");
+
+ spin_lock_bh(&ctx->block_lock);
+ list_for_each_entry(block, &ctx->block_list, node) {
+ dev_dbg(ctx->dev, "Block ipc %d, drv_id %d\n", block->msg_id,
+ block->drv_id);
+ if (block->msg_id == ipc && block->drv_id == drv_id) {
+ dev_dbg(ctx->dev, "free up the block\n");
+ block->ret_code = result;
+ block->data = data;
+ block->size = size;
+ block->condition = true;
+ spin_unlock_bh(&ctx->block_lock);
+ wake_up(&ctx->wait_queue);
+ return 0;
+ }
+ }
+ spin_unlock_bh(&ctx->block_lock);
+ dev_dbg(ctx->dev,
+ "Block not found or a response received for a short msg for ipc %d, drv_id %d\n",
+ ipc, drv_id);
+ return -EINVAL;
+}
+
+int sst_free_block(struct intel_sst_drv *ctx, struct sst_block *freed)
+{
+ struct sst_block *block = NULL, *__block;
+
+ dev_dbg(ctx->dev, "Enter\n");
+ spin_lock_bh(&ctx->block_lock);
+ list_for_each_entry_safe(block, __block, &ctx->block_list, node) {
+ if (block == freed) {
+ pr_debug("pvt_id freed --> %d\n", freed->drv_id);
+ /* toggle the index position of pvt_id */
+ list_del(&freed->node);
+ spin_unlock_bh(&ctx->block_lock);
+ kfree(freed->data);
+ freed->data = NULL;
+ kfree(freed);
+ return 0;
+ }
+ }
+ spin_unlock_bh(&ctx->block_lock);
+ dev_err(ctx->dev, "block is already freed!!!\n");
+ return -EINVAL;
+}
+
+int sst_post_message_mrfld(struct intel_sst_drv *sst_drv_ctx,
+ struct ipc_post *ipc_msg, bool sync)
+{
+ struct ipc_post *msg = ipc_msg;
+ union ipc_header_mrfld header;
+ unsigned int loop_count = 0;
+ int retval = 0;
+ unsigned long irq_flags;
+
+ dev_dbg(sst_drv_ctx->dev, "Enter: sync: %d\n", sync);
+ spin_lock_irqsave(&sst_drv_ctx->ipc_spin_lock, irq_flags);
+ header.full = sst_shim_read64(sst_drv_ctx->shim, SST_IPCX);
+ if (sync) {
+ while (header.p.header_high.part.busy) {
+ if (loop_count > 25) {
+ dev_err(sst_drv_ctx->dev,
+ "sst: Busy wait failed, cant send this msg\n");
+ retval = -EBUSY;
+ goto out;
+ }
+ cpu_relax();
+ loop_count++;
+ header.full = sst_shim_read64(sst_drv_ctx->shim, SST_IPCX);
+ }
+ } else {
+ if (list_empty(&sst_drv_ctx->ipc_dispatch_list)) {
+ /* queue is empty, nothing to send */
+ spin_unlock_irqrestore(&sst_drv_ctx->ipc_spin_lock, irq_flags);
+ dev_dbg(sst_drv_ctx->dev,
+ "Empty msg queue... NO Action\n");
+ return 0;
+ }
+
+ if (header.p.header_high.part.busy) {
+ spin_unlock_irqrestore(&sst_drv_ctx->ipc_spin_lock, irq_flags);
+ dev_dbg(sst_drv_ctx->dev, "Busy not free... post later\n");
+ return 0;
+ }
+
+ /* copy msg from list */
+ msg = list_entry(sst_drv_ctx->ipc_dispatch_list.next,
+ struct ipc_post, node);
+ list_del(&msg->node);
+ }
+ dev_dbg(sst_drv_ctx->dev, "sst: Post message: header = %x\n",
+ msg->mrfld_header.p.header_high.full);
+ dev_dbg(sst_drv_ctx->dev, "sst: size = 0x%x\n",
+ msg->mrfld_header.p.header_low_payload);
+
+ if (msg->mrfld_header.p.header_high.part.large)
+ memcpy_toio(sst_drv_ctx->mailbox + SST_MAILBOX_SEND,
+ msg->mailbox_data,
+ msg->mrfld_header.p.header_low_payload);
+
+ sst_shim_write64(sst_drv_ctx->shim, SST_IPCX, msg->mrfld_header.full);
+
+out:
+ spin_unlock_irqrestore(&sst_drv_ctx->ipc_spin_lock, irq_flags);
+ kfree(msg->mailbox_data);
+ kfree(msg);
+ return retval;
+}
+
+void intel_sst_clear_intr_mrfld(struct intel_sst_drv *sst_drv_ctx)
+{
+ union interrupt_reg_mrfld isr;
+ union interrupt_reg_mrfld imr;
+ union ipc_header_mrfld clear_ipc;
+ unsigned long irq_flags;
+
+ spin_lock_irqsave(&sst_drv_ctx->ipc_spin_lock, irq_flags);
+ imr.full = sst_shim_read64(sst_drv_ctx->shim, SST_IMRX);
+ isr.full = sst_shim_read64(sst_drv_ctx->shim, SST_ISRX);
+
+ /* write 1 to clear*/
+ isr.part.busy_interrupt = 1;
+ sst_shim_write64(sst_drv_ctx->shim, SST_ISRX, isr.full);
+
+ /* Set IA done bit */
+ clear_ipc.full = sst_shim_read64(sst_drv_ctx->shim, SST_IPCD);
+
+ clear_ipc.p.header_high.part.busy = 0;
+ clear_ipc.p.header_high.part.done = 1;
+ clear_ipc.p.header_low_payload = IPC_ACK_SUCCESS;
+ sst_shim_write64(sst_drv_ctx->shim, SST_IPCD, clear_ipc.full);
+ /* un mask busy interrupt */
+ imr.part.busy_interrupt = 0;
+ sst_shim_write64(sst_drv_ctx->shim, SST_IMRX, imr.full);
+ spin_unlock_irqrestore(&sst_drv_ctx->ipc_spin_lock, irq_flags);
+}
+
+
+/*
+ * process_fw_init - process the FW init msg
+ *
+ * @msg: IPC message mailbox data from FW
+ *
+ * This function processes the FW init msg from FW
+ * marks FW state and prints debug info of loaded FW
+ */
+static void process_fw_init(struct intel_sst_drv *sst_drv_ctx,
+ void *msg)
+{
+ struct ipc_header_fw_init *init =
+ (struct ipc_header_fw_init *)msg;
+ int retval = 0;
+
+ dev_dbg(sst_drv_ctx->dev, "*** FW Init msg came***\n");
+ if (init->result) {
+ sst_drv_ctx->sst_state = SST_RESET;
+ dev_err(sst_drv_ctx->dev, "FW Init failed, Error %x\n",
+ init->result);
+ retval = init->result;
+ goto ret;
+ }
+
+ret:
+ sst_wake_up_block(sst_drv_ctx, retval, FW_DWNL_ID, 0 , NULL, 0);
+}
+
+static void process_fw_async_msg(struct intel_sst_drv *sst_drv_ctx,
+ struct ipc_post *msg)
+{
+ u32 msg_id;
+ int str_id;
+ u32 data_size, i;
+ void *data_offset;
+ struct stream_info *stream;
+ union ipc_header_high msg_high;
+ u32 msg_low, pipe_id;
+
+ msg_high = msg->mrfld_header.p.header_high;
+ msg_low = msg->mrfld_header.p.header_low_payload;
+ msg_id = ((struct ipc_dsp_hdr *)msg->mailbox_data)->cmd_id;
+ data_offset = (msg->mailbox_data + sizeof(struct ipc_dsp_hdr));
+ data_size = msg_low - (sizeof(struct ipc_dsp_hdr));
+
+ switch (msg_id) {
+ case IPC_SST_PERIOD_ELAPSED_MRFLD:
+ pipe_id = ((struct ipc_dsp_hdr *)msg->mailbox_data)->pipe_id;
+ str_id = get_stream_id_mrfld(sst_drv_ctx, pipe_id);
+ if (str_id > 0) {
+ dev_dbg(sst_drv_ctx->dev,
+ "Period elapsed rcvd for pipe id 0x%x\n",
+ pipe_id);
+ stream = &sst_drv_ctx->streams[str_id];
+ if (stream->period_elapsed)
+ stream->period_elapsed(stream->pcm_substream);
+ if (stream->compr_cb)
+ stream->compr_cb(stream->compr_cb_param);
+ }
+ break;
+
+ case IPC_IA_DRAIN_STREAM_MRFLD:
+ pipe_id = ((struct ipc_dsp_hdr *)msg->mailbox_data)->pipe_id;
+ str_id = get_stream_id_mrfld(sst_drv_ctx, pipe_id);
+ if (str_id > 0) {
+ stream = &sst_drv_ctx->streams[str_id];
+ if (stream->drain_notify)
+ stream->drain_notify(stream->drain_cb_param);
+ }
+ break;
+
+ case IPC_IA_FW_ASYNC_ERR_MRFLD:
+ dev_err(sst_drv_ctx->dev, "FW sent async error msg:\n");
+ for (i = 0; i < (data_size/4); i++)
+ print_hex_dump(KERN_DEBUG, NULL, DUMP_PREFIX_NONE,
+ 16, 4, data_offset, data_size, false);
+ break;
+
+ case IPC_IA_FW_INIT_CMPLT_MRFLD:
+ process_fw_init(sst_drv_ctx, data_offset);
+ break;
+
+ case IPC_IA_BUF_UNDER_RUN_MRFLD:
+ pipe_id = ((struct ipc_dsp_hdr *)msg->mailbox_data)->pipe_id;
+ str_id = get_stream_id_mrfld(sst_drv_ctx, pipe_id);
+ if (str_id > 0)
+ dev_err(sst_drv_ctx->dev,
+ "Buffer under-run for pipe:%#x str_id:%d\n",
+ pipe_id, str_id);
+ break;
+
+ default:
+ dev_err(sst_drv_ctx->dev,
+ "Unrecognized async msg from FW msg_id %#x\n", msg_id);
+ }
+}
+
+void sst_process_reply_mrfld(struct intel_sst_drv *sst_drv_ctx,
+ struct ipc_post *msg)
+{
+ unsigned int drv_id;
+ void *data;
+ union ipc_header_high msg_high;
+ u32 msg_low;
+ struct ipc_dsp_hdr *dsp_hdr;
+ unsigned int cmd_id;
+
+ msg_high = msg->mrfld_header.p.header_high;
+ msg_low = msg->mrfld_header.p.header_low_payload;
+
+ dev_dbg(sst_drv_ctx->dev, "IPC process message header %x payload %x\n",
+ msg->mrfld_header.p.header_high.full,
+ msg->mrfld_header.p.header_low_payload);
+
+ drv_id = msg_high.part.drv_id;
+
+ /* Check for async messages first */
+ if (drv_id == SST_ASYNC_DRV_ID) {
+ /*FW sent async large message*/
+ process_fw_async_msg(sst_drv_ctx, msg);
+ return;
+ }
+
+ /* FW sent short error response for an IPC */
+ if (msg_high.part.result && drv_id && !msg_high.part.large) {
+ /* 32-bit FW error code in msg_low */
+ dev_err(sst_drv_ctx->dev, "FW sent error response 0x%x", msg_low);
+ sst_wake_up_block(sst_drv_ctx, msg_high.part.result,
+ msg_high.part.drv_id,
+ msg_high.part.msg_id, NULL, 0);
+ return;
+ }
+
+ /*
+ * Process all valid responses
+ * if it is a large message, the payload contains the size to
+ * copy from mailbox
+ **/
+ if (msg_high.part.large) {
+ data = kzalloc(msg_low, GFP_KERNEL);
+ if (!data)
+ return;
+ memcpy(data, (void *) msg->mailbox_data, msg_low);
+ /* Copy command id so that we can use to put sst to reset */
+ dsp_hdr = (struct ipc_dsp_hdr *)data;
+ cmd_id = dsp_hdr->cmd_id;
+ dev_dbg(sst_drv_ctx->dev, "cmd_id %d\n", dsp_hdr->cmd_id);
+ if (sst_wake_up_block(sst_drv_ctx, msg_high.part.result,
+ msg_high.part.drv_id,
+ msg_high.part.msg_id, data, msg_low))
+ kfree(data);
+ } else {
+ sst_wake_up_block(sst_drv_ctx, msg_high.part.result,
+ msg_high.part.drv_id,
+ msg_high.part.msg_id, NULL, 0);
+ }
+
+}