M7350/kernel/drivers/platform/msm/mhi/mhi_init.c

/* Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * 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 "mhi_sys.h"
#include "mhi.h"
#include "mhi_hwio.h"
#include "mhi_macros.h"

#include <linux/hrtimer.h>
#include <linux/cpu.h>
#include <linux/kthread.h>
#include <linux/slab.h>
#include <linux/completion.h>
#include <linux/platform_device.h>

static int mhi_init_sync(struct mhi_device_ctxt *mhi_dev_ctxt)
{
	int i;

	mhi_dev_ctxt->mhi_ev_spinlock_list = kmalloc(sizeof(spinlock_t) *
					mhi_dev_ctxt->mmio_info.nr_event_rings,
					GFP_KERNEL);
	if (NULL == mhi_dev_ctxt->mhi_ev_spinlock_list)
		goto ev_mutex_free;
	mhi_dev_ctxt->mhi_chan_mutex = kmalloc(sizeof(struct mutex) *
						MHI_MAX_CHANNELS, GFP_KERNEL);
	if (NULL == mhi_dev_ctxt->mhi_chan_mutex)
		goto chan_mutex_free;
	mhi_dev_ctxt->mhi_cmd_mutex_list = kmalloc(sizeof(struct mutex) *
						NR_OF_CMD_RINGS, GFP_KERNEL);
	if (NULL == mhi_dev_ctxt->mhi_cmd_mutex_list)
		goto cmd_mutex_free;

	mhi_dev_ctxt->db_write_lock = kmalloc(sizeof(spinlock_t) *
						MHI_MAX_CHANNELS, GFP_KERNEL);
	if (NULL == mhi_dev_ctxt->db_write_lock)
		goto db_write_lock_free;
	for (i = 0; i < MHI_MAX_CHANNELS; ++i)
		mutex_init(&mhi_dev_ctxt->mhi_chan_mutex[i]);
	for (i = 0; i < mhi_dev_ctxt->mmio_info.nr_event_rings; ++i)
		spin_lock_init(&mhi_dev_ctxt->mhi_ev_spinlock_list[i]);
	for (i = 0; i < NR_OF_CMD_RINGS; ++i)
		mutex_init(&mhi_dev_ctxt->mhi_cmd_mutex_list[i]);
	for (i = 0; i < MHI_MAX_CHANNELS; ++i)
		spin_lock_init(&mhi_dev_ctxt->db_write_lock[i]);
	rwlock_init(&mhi_dev_ctxt->xfer_lock);
	mutex_init(&mhi_dev_ctxt->mhi_link_state);
	mutex_init(&mhi_dev_ctxt->pm_lock);
	atomic_set(&mhi_dev_ctxt->flags.m2_transition, 0);
	return 0;

db_write_lock_free:
	kfree(mhi_dev_ctxt->mhi_cmd_mutex_list);
cmd_mutex_free:
	kfree(mhi_dev_ctxt->mhi_chan_mutex);
chan_mutex_free:
	kfree(mhi_dev_ctxt->mhi_ev_spinlock_list);
ev_mutex_free:
	return -ENOMEM;
}

size_t calculate_mhi_space(struct mhi_device_ctxt *mhi_dev_ctxt)
{
	int i, r;
	size_t mhi_dev_mem = 0;
	struct mhi_chan_info chan_info;

	/* Calculate size needed for contexts */
	mhi_dev_mem += (MHI_MAX_CHANNELS * sizeof(struct mhi_chan_ctxt)) +
			(NR_OF_CMD_RINGS * sizeof(struct mhi_chan_ctxt)) +
			(mhi_dev_ctxt->mmio_info.nr_event_rings *
					  sizeof(struct mhi_event_ctxt));
	mhi_log(MHI_MSG_INFO, "Reserved %zd bytes for context info\n",
				mhi_dev_mem);
	/*Calculate size needed for cmd TREs */
	mhi_dev_mem += (CMD_EL_PER_RING * sizeof(union mhi_cmd_pkt));

	/* Calculate size needed for event TREs */
	for (i = 0; i < mhi_dev_ctxt->mmio_info.nr_event_rings; ++i)
		mhi_dev_mem += (sizeof(union mhi_event_pkt) *
				mhi_dev_ctxt->ev_ring_props[i].nr_desc);

	/* Calculate size needed for xfer TREs and bounce buffers */
	for (i = 0; i < MHI_MAX_CHANNELS; ++i)
		if (VALID_CHAN_NR(i)) {
			r = get_chan_props(mhi_dev_ctxt, i, &chan_info);
			if (r)
				continue;
			/* Add size of TREs */
			mhi_dev_mem += (sizeof(union mhi_xfer_pkt) *
					chan_info.max_desc);
			/* Add bounce buffer size */
			if (mhi_dev_ctxt->flags.bb_enabled) {
				mhi_log(MHI_MSG_INFO,
					"Enabling BB list, chan %d\n", i);
				/*mhi_dev_mem += (MAX_BOUNCE_BUF_SIZE *
						chan_info.max_desc); */
			}
		}
	mhi_log(MHI_MSG_INFO, "Final bytes for MHI device space %zd\n",
				mhi_dev_mem);
	return mhi_dev_mem;
}

void init_dev_ev_ctxt(struct mhi_event_ctxt *ev_ctxt,
		 dma_addr_t p_base_addr, size_t len)
{
	ev_ctxt->mhi_event_ring_base_addr = p_base_addr;
	ev_ctxt->mhi_event_read_ptr = p_base_addr;
	ev_ctxt->mhi_event_write_ptr = p_base_addr;
	ev_ctxt->mhi_event_ring_len = len;
}

void init_local_ev_ctxt(struct mhi_ring *ev_ctxt,
		 void *v_base_addr, size_t len)
{
	ev_ctxt->base = v_base_addr;
	ev_ctxt->rp = v_base_addr;
	ev_ctxt->wp = v_base_addr;
	ev_ctxt->len = len;
	ev_ctxt->el_size = sizeof(union mhi_event_pkt);
	ev_ctxt->overwrite_en = 0;
}

void init_dev_chan_ctxt(struct mhi_chan_ctxt *chan_ctxt,
		 dma_addr_t p_base_addr, size_t len, int ev_index)
{
	chan_ctxt->mhi_trb_ring_base_addr = p_base_addr;
	chan_ctxt->mhi_trb_read_ptr = p_base_addr;
	chan_ctxt->mhi_trb_write_ptr = p_base_addr;
	chan_ctxt->mhi_trb_ring_len = len;
	/* Prepulate the channel ctxt */
	chan_ctxt->mhi_chan_state = MHI_CHAN_STATE_ENABLED;
	chan_ctxt->mhi_event_ring_index = ev_index;
}

void init_local_chan_ctxt(struct mhi_ring *chan_ctxt,
		 void *v_base_addr, size_t len)
{
	chan_ctxt->base = v_base_addr;
	chan_ctxt->rp = v_base_addr;
	chan_ctxt->wp = v_base_addr;
	chan_ctxt->len = len;
	chan_ctxt->el_size = sizeof(union mhi_event_pkt);
	chan_ctxt->overwrite_en = 0;
}

int populate_bb_list(struct list_head *bb_list, int num_bb)
{
	struct mhi_buf_info *mhi_buf = NULL;
	int i;

	for (i = 0; i < num_bb; ++i) {
		mhi_buf = kzalloc(sizeof(struct mhi_buf_info), GFP_KERNEL);
		if (!mhi_buf)
			return -ENOMEM;
		mhi_buf->bb_p_addr = 0;
		mhi_buf->bb_v_addr = NULL;
		mhi_log(MHI_MSG_INFO,
			"Allocated BB v_addr 0x%p, p_addr 0x%llx\n",
			mhi_buf->bb_v_addr, (u64)mhi_buf->bb_p_addr);
	}
	return 0;
}
/**
 * mhi_cmd_ring_init-  Initialization of the command ring
 *
 * @cmd_ctxt:			command ring context to initialize
 * @trb_list_phy_addr:		Pointer to the dma address of the tre ring
 * @trb_list_virt_addr:		Pointer to the virtual address of the tre ring
 * @ring_size:			Ring size
 * @ring:			Pointer to the shadow command context
 *
 * @Return MHI_STATUS
 */
static int mhi_cmd_ring_init(struct mhi_cmd_ctxt *cmd_ctxt,
				void *trb_list_virt_addr,
				dma_addr_t trb_list_phy_addr,
				size_t ring_size, struct mhi_ring *ring)
{
	cmd_ctxt->mhi_cmd_ring_base_addr = trb_list_phy_addr;
	cmd_ctxt->mhi_cmd_ring_read_ptr = trb_list_phy_addr;
	cmd_ctxt->mhi_cmd_ring_write_ptr = trb_list_phy_addr;
	cmd_ctxt->mhi_cmd_ring_len = ring_size;
	ring[PRIMARY_CMD_RING].wp = trb_list_virt_addr;
	ring[PRIMARY_CMD_RING].rp = trb_list_virt_addr;
	ring[PRIMARY_CMD_RING].base = trb_list_virt_addr;
	ring[PRIMARY_CMD_RING].len = ring_size;
	ring[PRIMARY_CMD_RING].el_size = sizeof(union mhi_cmd_pkt);
	ring[PRIMARY_CMD_RING].overwrite_en = 0;
	return 0;
}


static int enable_bb_ctxt(struct mhi_ring *bb_ctxt, int nr_el)
{
	bb_ctxt->el_size = sizeof(struct mhi_buf_info);
	bb_ctxt->len     = bb_ctxt->el_size * nr_el;
	bb_ctxt->base    = kzalloc(bb_ctxt->len, GFP_KERNEL);
	bb_ctxt->wp	 = bb_ctxt->base;
	bb_ctxt->rp	 = bb_ctxt->base;
	bb_ctxt->ack_rp  = bb_ctxt->base;
	if (!bb_ctxt->base)
		return -ENOMEM;
	return 0;
}

static void calculate_mhi_addressing_window(
			struct mhi_device_ctxt *mhi_dev_ctxt)
{
	dma_addr_t dma_dev_mem_start;
	dma_addr_t dma_seg_size = 0x1FF00000UL;
	dma_addr_t dma_max_addr = (dma_addr_t)(-1);

	dma_dev_mem_start = mhi_dev_ctxt->dev_space.dma_dev_mem_start;

	if (dma_dev_mem_start < dma_seg_size) {
		mhi_dev_ctxt->dev_space.start_win_addr = 0;
		mhi_dev_ctxt->dev_space.end_win_addr =
			dma_dev_mem_start + dma_seg_size +
				       (dma_seg_size - dma_dev_mem_start);
	} else if (dma_dev_mem_start >= dma_seg_size &&
			dma_dev_mem_start <= (dma_max_addr - dma_seg_size)) {
		mhi_dev_ctxt->dev_space.start_win_addr =
					 dma_dev_mem_start - dma_seg_size;
		mhi_dev_ctxt->dev_space.end_win_addr =
					 dma_dev_mem_start + dma_seg_size;
	} else if (dma_dev_mem_start > (dma_max_addr - dma_seg_size)) {
		mhi_dev_ctxt->dev_space.start_win_addr =
				dma_dev_mem_start - (dma_seg_size +
						(dma_seg_size - (dma_max_addr -
							dma_dev_mem_start)));
		mhi_dev_ctxt->dev_space.end_win_addr = dma_max_addr;
	}
	mhi_log(MHI_MSG_INFO,
	"MHI start address at 0x%llx, Window Start 0x%llx Window End 0x%llx\n",
		(u64)dma_dev_mem_start,
		(u64)mhi_dev_ctxt->dev_space.start_win_addr,
		(u64)mhi_dev_ctxt->dev_space.end_win_addr);

}

int init_mhi_dev_mem(struct mhi_device_ctxt *mhi_dev_ctxt)
{
	size_t mhi_mem_index = 0, ring_len;
	void *dev_mem_start;
	dma_addr_t dma_dev_mem_start;
	int i, r;

	mhi_dev_ctxt->dev_space.dev_mem_len =
					calculate_mhi_space(mhi_dev_ctxt);

	mhi_dev_ctxt->dev_space.dev_mem_start =
		dma_alloc_coherent(&mhi_dev_ctxt->dev_info->plat_dev->dev,
				    mhi_dev_ctxt->dev_space.dev_mem_len,
				   &mhi_dev_ctxt->dev_space.dma_dev_mem_start,
				    GFP_KERNEL);
	if (!mhi_dev_ctxt->dev_space.dev_mem_start) {
		mhi_log(MHI_MSG_ERROR,
			"Failed to allocate memory of size %zd bytes\n",
			mhi_dev_ctxt->dev_space.dev_mem_len);
		return -ENOMEM;
	}
	dev_mem_start = mhi_dev_ctxt->dev_space.dev_mem_start;
	dma_dev_mem_start = mhi_dev_ctxt->dev_space.dma_dev_mem_start;
	memset(dev_mem_start, 0, mhi_dev_ctxt->dev_space.dev_mem_len);

	calculate_mhi_addressing_window(mhi_dev_ctxt);

	mhi_log(MHI_MSG_INFO, "Starting Seg address: virt 0x%p, dma 0x%llx\n",
					dev_mem_start, (u64)dma_dev_mem_start);

	mhi_log(MHI_MSG_INFO, "Initializing CCABAP at virt 0x%p, dma 0x%llx\n",
					dev_mem_start + mhi_mem_index,
					(u64)dma_dev_mem_start + mhi_mem_index);
	mhi_dev_ctxt->dev_space.ring_ctxt.cc_list = dev_mem_start;
	mhi_dev_ctxt->dev_space.ring_ctxt.dma_cc_list = dma_dev_mem_start;
	mhi_mem_index += MHI_MAX_CHANNELS * sizeof(struct mhi_chan_ctxt);

	mhi_log(MHI_MSG_INFO, "Initializing CRCBAP at virt 0x%p, dma 0x%llx\n",
					dev_mem_start + mhi_mem_index,
					(u64)dma_dev_mem_start + mhi_mem_index);

	mhi_dev_ctxt->dev_space.ring_ctxt.cmd_ctxt =
						dev_mem_start + mhi_mem_index;
	mhi_dev_ctxt->dev_space.ring_ctxt.dma_cmd_ctxt =
					dma_dev_mem_start + mhi_mem_index;
	mhi_mem_index += NR_OF_CMD_RINGS * sizeof(struct mhi_chan_ctxt);

	mhi_log(MHI_MSG_INFO, "Initializing ECABAP at virt 0x%p, dma 0x%llx\n",
					dev_mem_start + mhi_mem_index,
					(u64)dma_dev_mem_start + mhi_mem_index);
	mhi_dev_ctxt->dev_space.ring_ctxt.ec_list =
						dev_mem_start + mhi_mem_index;
	mhi_dev_ctxt->dev_space.ring_ctxt.dma_ec_list =
					dma_dev_mem_start + mhi_mem_index;
	mhi_mem_index += mhi_dev_ctxt->mmio_info.nr_event_rings *
					  sizeof(struct mhi_event_ctxt);

	mhi_log(MHI_MSG_INFO,
			"Initializing CMD context at virt 0x%p, dma 0x%llx\n",
					dev_mem_start + mhi_mem_index,
					(u64)dma_dev_mem_start + mhi_mem_index);

	/* TODO: Initialize both the local and device cmd context */
	ring_len = (CMD_EL_PER_RING * sizeof(union mhi_cmd_pkt));
	mhi_cmd_ring_init(mhi_dev_ctxt->dev_space.ring_ctxt.cmd_ctxt,
			 dev_mem_start + mhi_mem_index,
			 dma_dev_mem_start + mhi_mem_index,
			 ring_len,
			 mhi_dev_ctxt->mhi_local_cmd_ctxt);
	mhi_mem_index += ring_len;

	/* Initialize both the local and device event contexts */
	for (i = 0; i < mhi_dev_ctxt->mmio_info.nr_event_rings; ++i) {
		ring_len = sizeof(union mhi_event_pkt) *
					mhi_dev_ctxt->ev_ring_props[i].nr_desc;
		init_dev_ev_ctxt(&mhi_dev_ctxt->dev_space.ring_ctxt.ec_list[i],
				dma_dev_mem_start + mhi_mem_index,
				ring_len);
		init_local_ev_ctxt(&mhi_dev_ctxt->mhi_local_event_ctxt[i],
				dev_mem_start + mhi_mem_index,
				ring_len);
		mhi_log(MHI_MSG_INFO,
			"Initializing EV_%d TRE list at virt 0x%p dma 0x%llx\n",
				i, dev_mem_start + mhi_mem_index,
				(u64)dma_dev_mem_start + mhi_mem_index);
		mhi_mem_index += ring_len;
	}

	/* Initialize both the local and device xfer contexts */
	for (i = 0; i < MHI_MAX_CHANNELS; ++i)
		if (VALID_CHAN_NR(i)) {
			struct mhi_chan_info chan_info;

			r = get_chan_props(mhi_dev_ctxt, i, &chan_info);
			if (r)
				continue;
			mhi_log(MHI_MSG_INFO, "Initializing chan ctxt %d\n", i);
			ring_len = (sizeof(union mhi_xfer_pkt) *
							chan_info.max_desc);
			init_dev_chan_ctxt(
				&mhi_dev_ctxt->dev_space.ring_ctxt.cc_list[i],
				dma_dev_mem_start + mhi_mem_index,
				ring_len, chan_info.ev_ring);
			/* TODO: May not need to do this. It would be best for
			 *	the client to set it during chan open */
			mhi_dev_ctxt->dev_space.ring_ctxt.cc_list[i].
						mhi_chan_type = (i % 2) + 1;
			init_local_chan_ctxt(
				&mhi_dev_ctxt->mhi_local_chan_ctxt[i],
				dev_mem_start + mhi_mem_index,
				ring_len);
			/* TODO: May not need to do this. It would be best for
			 *	the client to set it during chan open */
			mhi_dev_ctxt->mhi_local_chan_ctxt[i].dir = (i % 2) + 1;
			/* Add size of TREs */
			mhi_mem_index += ring_len;
			if (mhi_dev_ctxt->flags.bb_enabled) {
				r = enable_bb_ctxt(
						&mhi_dev_ctxt->chan_bb_list[i],
						chan_info.max_desc);
				if (r)
					goto error_during_bb_list;
			}
		}
	return 0;

error_during_bb_list:
	for (; i >= 0; --i)
		kfree(mhi_dev_ctxt->chan_bb_list[i].base);
	dma_free_coherent(&mhi_dev_ctxt->dev_info->plat_dev->dev,
			   mhi_dev_ctxt->dev_space.dev_mem_len,
			   mhi_dev_ctxt->dev_space.dev_mem_start,
			   mhi_dev_ctxt->dev_space.dma_dev_mem_start);
	return r;
}

static int mhi_init_events(struct mhi_device_ctxt *mhi_dev_ctxt)
{

	mhi_dev_ctxt->mhi_ev_wq.mhi_event_wq = kmalloc(
						sizeof(wait_queue_head_t),
						GFP_KERNEL);
	if (NULL == mhi_dev_ctxt->mhi_ev_wq.mhi_event_wq) {
		mhi_log(MHI_MSG_ERROR, "Failed to init event");
		return MHI_STATUS_ERROR;
	}
	mhi_dev_ctxt->mhi_ev_wq.state_change_event =
				kmalloc(sizeof(wait_queue_head_t), GFP_KERNEL);
	if (NULL == mhi_dev_ctxt->mhi_ev_wq.state_change_event) {
		mhi_log(MHI_MSG_ERROR, "Failed to init event");
		goto error_event_handle_alloc;
	}
	/* Initialize the event which signals M0 */
	mhi_dev_ctxt->mhi_ev_wq.m0_event = kmalloc(sizeof(wait_queue_head_t),
								GFP_KERNEL);
	if (NULL == mhi_dev_ctxt->mhi_ev_wq.m0_event) {
		mhi_log(MHI_MSG_ERROR, "Failed to init event");
		goto error_state_change_event_handle;
	}
	/* Initialize the event which signals M0 */
	mhi_dev_ctxt->mhi_ev_wq.m3_event = kmalloc(sizeof(wait_queue_head_t),
								GFP_KERNEL);
	if (NULL == mhi_dev_ctxt->mhi_ev_wq.m3_event) {
		mhi_log(MHI_MSG_ERROR, "Failed to init event");
		goto error_m0_event;
	}
	/* Initialize the event which signals M0 */
	mhi_dev_ctxt->mhi_ev_wq.bhi_event = kmalloc(sizeof(wait_queue_head_t),
								GFP_KERNEL);
	if (NULL == mhi_dev_ctxt->mhi_ev_wq.bhi_event) {
		mhi_log(MHI_MSG_ERROR, "Failed to init event");
		goto error_bhi_event;
	}
	/* Initialize the event which starts the event parsing thread */
	init_waitqueue_head(mhi_dev_ctxt->mhi_ev_wq.mhi_event_wq);
	/* Initialize the event which starts the state change thread */
	init_waitqueue_head(mhi_dev_ctxt->mhi_ev_wq.state_change_event);
	/* Initialize the event which triggers clients waiting to send */
	init_waitqueue_head(mhi_dev_ctxt->mhi_ev_wq.m0_event);
	/* Initialize the event which triggers D3hot */
	init_waitqueue_head(mhi_dev_ctxt->mhi_ev_wq.m3_event);
	init_waitqueue_head(mhi_dev_ctxt->mhi_ev_wq.bhi_event);

	return 0;
error_bhi_event:
	kfree(mhi_dev_ctxt->mhi_ev_wq.m3_event);
error_m0_event:
	kfree(mhi_dev_ctxt->mhi_ev_wq.m0_event);
error_state_change_event_handle:
	kfree(mhi_dev_ctxt->mhi_ev_wq.state_change_event);
error_event_handle_alloc:
	kfree(mhi_dev_ctxt->mhi_ev_wq.mhi_event_wq);
	return MHI_STATUS_ERROR;
}

static int mhi_init_state_change_thread_work_queue(
			struct mhi_state_work_queue *q)
{
	bool lock_acquired = 0;
	unsigned long flags;

	if (NULL == q->q_lock) {
		q->q_lock = kmalloc(sizeof(spinlock_t), GFP_KERNEL);
		if (NULL == q->q_lock)
			return -ENOMEM;
		spin_lock_init(q->q_lock);
	} else {
		spin_lock_irqsave(q->q_lock, flags);
		lock_acquired = 1;
	}
	q->queue_full_cntr = 0;
	q->q_info.base = q->buf;
	q->q_info.rp = q->buf;
	q->q_info.wp = q->buf;
	q->q_info.len = MHI_WORK_Q_MAX_SIZE * sizeof(enum STATE_TRANSITION);
	q->q_info.el_size = sizeof(enum STATE_TRANSITION);
	q->q_info.overwrite_en = 0;
	if (lock_acquired)
		spin_unlock_irqrestore(q->q_lock, flags);

	return 0;
}

static void mhi_init_wakelock(struct mhi_device_ctxt *mhi_dev_ctxt)
{
	wakeup_source_init(&mhi_dev_ctxt->w_lock, "mhi_wakeup_source");
}

static int mhi_spawn_threads(struct mhi_device_ctxt *mhi_dev_ctxt)
{
	mhi_dev_ctxt->event_thread_handle = kthread_run(parse_event_thread,
							mhi_dev_ctxt,
							"mhi_ev_thrd");
	if (IS_ERR(mhi_dev_ctxt->event_thread_handle))
		return MHI_STATUS_ERROR;
	mhi_dev_ctxt->st_thread_handle = kthread_run(mhi_state_change_thread,
							mhi_dev_ctxt,
							"mhi_st_thrd");
	if (IS_ERR(mhi_dev_ctxt->event_thread_handle))
		return MHI_STATUS_ERROR;
	return 0;
}

/**
 * @brief Main initialization function for a mhi struct device context
 *	 All threads, events mutexes, mhi specific data structures
 *	 are initialized here
 *
 * @param dev_info [IN ] pcie struct device information structure to
 which this mhi context belongs
 * @param mhi_struct device [IN/OUT] reference to a mhi context to be populated
 *
 * @return MHI_STATUS
 */
int mhi_init_device_ctxt(struct mhi_pcie_dev_info *dev_info,
		struct mhi_device_ctxt *mhi_dev_ctxt)
{
	int r = 0;

	if (NULL == dev_info || NULL == mhi_dev_ctxt)
		return -EINVAL;

	mhi_log(MHI_MSG_VERBOSE, "Entered\n");

	mhi_dev_ctxt->dev_info = dev_info;
	mhi_dev_ctxt->dev_props = &dev_info->core;

	r = mhi_populate_event_cfg(mhi_dev_ctxt);
	if (r) {
		mhi_log(MHI_MSG_ERROR,
			"Failed to get event ring properties ret %d\n", r);
		goto error_during_props;
	}
	r = mhi_init_sync(mhi_dev_ctxt);
	if (r) {
		mhi_log(MHI_MSG_ERROR, "Failed to initialize mhi sync\n");
		goto error_during_sync;
	}
	r = create_local_ev_ctxt(mhi_dev_ctxt);
	if (r) {
		mhi_log(MHI_MSG_ERROR,
			"Failed to initialize local event ctxt ret %d\n", r);
		goto error_during_local_ev_ctxt;
	}
	r = init_mhi_dev_mem(mhi_dev_ctxt);
	if (r) {
		mhi_log(MHI_MSG_ERROR,
			"Failed to initialize device memory ret %d\n", r);
		goto error_during_dev_mem_init;
	}
	r = mhi_init_events(mhi_dev_ctxt);
	if (r) {
		mhi_log(MHI_MSG_ERROR,
			"Failed to initialize mhi events ret %d\n", r);
		goto error_wq_init;
	}
	r = mhi_reset_all_thread_queues(mhi_dev_ctxt);
	if (r) {
		mhi_log(MHI_MSG_ERROR,
			"Failed to initialize work queues ret %d\n", r);
		goto error_during_thread_init;
	}
	init_event_ctxt_array(mhi_dev_ctxt);
	mhi_dev_ctxt->mhi_state = MHI_STATE_RESET;
	mhi_dev_ctxt->enable_lpm = 1;

	r = mhi_spawn_threads(mhi_dev_ctxt);
	if (r) {
		mhi_log(MHI_MSG_ERROR, "Failed to spawn threads ret %d\n", r);
		goto error_during_thread_spawn;
	}
	mhi_init_wakelock(mhi_dev_ctxt);

	return r;

error_during_thread_spawn:
	kfree(mhi_dev_ctxt->state_change_work_item_list.q_lock);
error_during_thread_init:
	kfree(mhi_dev_ctxt->mhi_ev_wq.mhi_event_wq);
	kfree(mhi_dev_ctxt->mhi_ev_wq.state_change_event);
	kfree(mhi_dev_ctxt->mhi_ev_wq.m0_event);
	kfree(mhi_dev_ctxt->mhi_ev_wq.m3_event);
	kfree(mhi_dev_ctxt->mhi_ev_wq.bhi_event);
error_wq_init:
	dma_free_coherent(&mhi_dev_ctxt->dev_info->plat_dev->dev,
		   mhi_dev_ctxt->dev_space.dev_mem_len,
		   mhi_dev_ctxt->dev_space.dev_mem_start,
		   mhi_dev_ctxt->dev_space.dma_dev_mem_start);
error_during_dev_mem_init:
error_during_local_ev_ctxt:
	kfree(mhi_dev_ctxt->mhi_cmd_mutex_list);
	kfree(mhi_dev_ctxt->mhi_chan_mutex);
	kfree(mhi_dev_ctxt->mhi_ev_spinlock_list);
error_during_sync:
	kfree(mhi_dev_ctxt->ev_ring_props);
error_during_props:
	return r;
}

/**
 * @brief Initialize the channel context and shadow context
 *
 * @cc_list:		Context to initialize
 * @trb_list_phy:	Physical base address for the TRE ring
 * @trb_list_virt:	Virtual base address for the TRE ring
 * @el_per_ring:	Number of TREs this ring will contain
 * @chan_type:		Type of channel IN/OUT
 * @event_ring:	 Event ring to be mapped to this channel context
 * @ring:		 Shadow context to be initialized alongside
 *
 * @Return MHI_STATUS
 */
int mhi_init_chan_ctxt(struct mhi_chan_ctxt *cc_list,
		uintptr_t trb_list_phy, uintptr_t trb_list_virt,
		u64 el_per_ring, enum MHI_CHAN_TYPE chan_type,
		u32 event_ring, struct mhi_ring *ring,
		enum MHI_CHAN_STATE chan_state)
{
	cc_list->mhi_chan_state = chan_state;
	cc_list->mhi_chan_type = chan_type;
	cc_list->mhi_event_ring_index = event_ring;
	cc_list->mhi_trb_ring_base_addr = trb_list_phy;
	cc_list->mhi_trb_ring_len =
		((size_t)(el_per_ring)*sizeof(struct mhi_tx_pkt));
	cc_list->mhi_trb_read_ptr = trb_list_phy;
	cc_list->mhi_trb_write_ptr = trb_list_phy;
	ring->rp = (void *)(trb_list_virt);
	ring->ack_rp = ring->rp;
	ring->wp = (void *)(trb_list_virt);
	ring->base = (void *)(trb_list_virt);
	ring->len = ((size_t)(el_per_ring)*sizeof(struct mhi_tx_pkt));
	ring->el_size = sizeof(struct mhi_tx_pkt);
	ring->overwrite_en = 0;
	ring->dir = chan_type;
	/* Flush writes to MMIO */
	wmb();
	return 0;
}

int mhi_reset_all_thread_queues(
		struct mhi_device_ctxt *mhi_dev_ctxt)
{
	int ret_val = 0;

	ret_val = mhi_init_state_change_thread_work_queue(
				&mhi_dev_ctxt->state_change_work_item_list);
	if (ret_val)
		mhi_log(MHI_MSG_ERROR, "Failed to reset STT work queue\n");
	return ret_val;
}

int mhi_reg_notifiers(struct mhi_device_ctxt *mhi_dev_ctxt)
{
	u32 ret_val;

	if (NULL == mhi_dev_ctxt)
		return MHI_STATUS_ERROR;
	mhi_dev_ctxt->mhi_cpu_notifier.notifier_call = mhi_cpu_notifier_cb;
	ret_val = register_cpu_notifier(&mhi_dev_ctxt->mhi_cpu_notifier);
	if (ret_val)
		return MHI_STATUS_ERROR;
	else
		return 0;
}