/*
 * Copyright (c) 2018 The Linux Foundation. All rights reserved.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <linux/clk.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>

#include "ce.h"
#include "debug.h"
#include "hif.h"
#include "htc.h"
#include "snoc.h"

#define ATH10K_SNOC_RX_POST_RETRY_MS 50
#define CE_POLL_PIPE 4

static char *const ce_name[] = {
	"WLAN_CE_0",
	"WLAN_CE_1",
	"WLAN_CE_2",
	"WLAN_CE_3",
	"WLAN_CE_4",
	"WLAN_CE_5",
	"WLAN_CE_6",
	"WLAN_CE_7",
	"WLAN_CE_8",
	"WLAN_CE_9",
	"WLAN_CE_10",
	"WLAN_CE_11",
};

static struct ath10k_wcn3990_vreg_info vreg_cfg[] = {
	{NULL, "vdd-0.8-cx-mx", 800000, 800000, 0, 0, false},
	{NULL, "vdd-1.8-xo", 1800000, 1800000, 0, 0, false},
	{NULL, "vdd-1.3-rfa", 1304000, 1304000, 0, 0, false},
	{NULL, "vdd-3.3-ch0", 3312000, 3312000, 0, 0, false},
};

static struct ath10k_wcn3990_clk_info clk_cfg[] = {
	{NULL, "cxo_ref_clk_pin", 0, false},
};

static void ath10k_snoc_htc_tx_cb(struct ath10k_ce_pipe *ce_state);
static void ath10k_snoc_htt_tx_cb(struct ath10k_ce_pipe *ce_state);
static void ath10k_snoc_htc_rx_cb(struct ath10k_ce_pipe *ce_state);
static void ath10k_snoc_htt_rx_cb(struct ath10k_ce_pipe *ce_state);
static void ath10k_snoc_htt_htc_rx_cb(struct ath10k_ce_pipe *ce_state);
static void ath10k_snoc_pktlog_rx_cb(struct ath10k_ce_pipe *ce_state);

static const struct ath10k_snoc_drv_priv drv_priv = {
	.hw_rev = ATH10K_HW_WCN3990,
	.dma_mask = DMA_BIT_MASK(37),
};

static struct ce_attr host_ce_config_wlan[] = {
	/* CE0: host->target HTC control streams */
	{
		.flags = CE_ATTR_FLAGS,
		.src_nentries = 16,
		.src_sz_max = 2048,
		.dest_nentries = 0,
		.send_cb = ath10k_snoc_htc_tx_cb,
	},

	/* CE1: target->host HTT + HTC control */
	{
		.flags = CE_ATTR_FLAGS,
		.src_nentries = 0,
		.src_sz_max = 2048,
		.dest_nentries = 512,
		.recv_cb = ath10k_snoc_htt_htc_rx_cb,
	},

	/* CE2: target->host WMI */
	{
		.flags = CE_ATTR_FLAGS,
		.src_nentries = 0,
		.src_sz_max = 2048,
		.dest_nentries = 64,
		.recv_cb = ath10k_snoc_htc_rx_cb,
	},

	/* CE3: host->target WMI */
	{
		.flags = CE_ATTR_FLAGS,
		.src_nentries = 32,
		.src_sz_max = 2048,
		.dest_nentries = 0,
		.send_cb = ath10k_snoc_htc_tx_cb,
	},

	/* CE4: host->target HTT */
	{
		.flags = CE_ATTR_FLAGS | CE_ATTR_DIS_INTR,
		.src_nentries = 256,
		.src_sz_max = 256,
		.dest_nentries = 0,
		.send_cb = ath10k_snoc_htt_tx_cb,
	},

	/* CE5: target->host HTT (ipa_uc->target ) */
	{
		.flags = CE_ATTR_FLAGS,
		.src_nentries = 0,
		.src_sz_max = 512,
		.dest_nentries = 512,
		.recv_cb = ath10k_snoc_htt_rx_cb,
	},

	/* CE6: target autonomous hif_memcpy */
	{
		.flags = CE_ATTR_FLAGS,
		.src_nentries = 0,
		.src_sz_max = 0,
		.dest_nentries = 0,
	},

	/* CE7: ce_diag, the Diagnostic Window */
	{
		.flags = CE_ATTR_FLAGS,
		.src_nentries = 2,
		.src_sz_max = 2048,
		.dest_nentries = 2,
	},

	/* CE8: Target to uMC */
	{
		.flags = CE_ATTR_FLAGS,
		.src_nentries = 0,
		.src_sz_max = 2048,
		.dest_nentries = 128,
	},

	/* CE9 target->host HTT */
	{
		.flags = CE_ATTR_FLAGS,
		.src_nentries = 0,
		.src_sz_max = 2048,
		.dest_nentries = 512,
		.recv_cb = ath10k_snoc_htt_htc_rx_cb,
	},

	/* CE10: target->host HTT */
	{
		.flags = CE_ATTR_FLAGS,
		.src_nentries = 0,
		.src_sz_max = 2048,
		.dest_nentries = 512,
		.recv_cb = ath10k_snoc_htt_htc_rx_cb,
	},

	/* CE11: target -> host PKTLOG */
	{
		.flags = CE_ATTR_FLAGS,
		.src_nentries = 0,
		.src_sz_max = 2048,
		.dest_nentries = 512,
		.recv_cb = ath10k_snoc_pktlog_rx_cb,
	},
};

static struct service_to_pipe target_service_to_ce_map_wlan[] = {
	{
		__cpu_to_le32(ATH10K_HTC_SVC_ID_WMI_DATA_VO),
		__cpu_to_le32(PIPEDIR_OUT),	/* out = UL = host -> target */
		__cpu_to_le32(3),
	},
	{
		__cpu_to_le32(ATH10K_HTC_SVC_ID_WMI_DATA_VO),
		__cpu_to_le32(PIPEDIR_IN),	/* in = DL = target -> host */
		__cpu_to_le32(2),
	},
	{
		__cpu_to_le32(ATH10K_HTC_SVC_ID_WMI_DATA_BK),
		__cpu_to_le32(PIPEDIR_OUT),	/* out = UL = host -> target */
		__cpu_to_le32(3),
	},
	{
		__cpu_to_le32(ATH10K_HTC_SVC_ID_WMI_DATA_BK),
		__cpu_to_le32(PIPEDIR_IN),	/* in = DL = target -> host */
		__cpu_to_le32(2),
	},
	{
		__cpu_to_le32(ATH10K_HTC_SVC_ID_WMI_DATA_BE),
		__cpu_to_le32(PIPEDIR_OUT),	/* out = UL = host -> target */
		__cpu_to_le32(3),
	},
	{
		__cpu_to_le32(ATH10K_HTC_SVC_ID_WMI_DATA_BE),
		__cpu_to_le32(PIPEDIR_IN),	/* in = DL = target -> host */
		__cpu_to_le32(2),
	},
	{
		__cpu_to_le32(ATH10K_HTC_SVC_ID_WMI_DATA_VI),
		__cpu_to_le32(PIPEDIR_OUT),	/* out = UL = host -> target */
		__cpu_to_le32(3),
	},
	{
		__cpu_to_le32(ATH10K_HTC_SVC_ID_WMI_DATA_VI),
		__cpu_to_le32(PIPEDIR_IN),	/* in = DL = target -> host */
		__cpu_to_le32(2),
	},
	{
		__cpu_to_le32(ATH10K_HTC_SVC_ID_WMI_CONTROL),
		__cpu_to_le32(PIPEDIR_OUT),	/* out = UL = host -> target */
		__cpu_to_le32(3),
	},
	{
		__cpu_to_le32(ATH10K_HTC_SVC_ID_WMI_CONTROL),
		__cpu_to_le32(PIPEDIR_IN),	/* in = DL = target -> host */
		__cpu_to_le32(2),
	},
	{
		__cpu_to_le32(ATH10K_HTC_SVC_ID_RSVD_CTRL),
		__cpu_to_le32(PIPEDIR_OUT),	/* out = UL = host -> target */
		__cpu_to_le32(0),
	},
	{
		__cpu_to_le32(ATH10K_HTC_SVC_ID_RSVD_CTRL),
		__cpu_to_le32(PIPEDIR_IN),	/* in = DL = target -> host */
		__cpu_to_le32(2),
	},
	{ /* not used */
		__cpu_to_le32(ATH10K_HTC_SVC_ID_TEST_RAW_STREAMS),
		__cpu_to_le32(PIPEDIR_OUT),	/* out = UL = host -> target */
		__cpu_to_le32(0),
	},
	{ /* not used */
		__cpu_to_le32(ATH10K_HTC_SVC_ID_TEST_RAW_STREAMS),
		__cpu_to_le32(PIPEDIR_IN),	/* in = DL = target -> host */
		__cpu_to_le32(2),
	},
	{
		__cpu_to_le32(ATH10K_HTC_SVC_ID_HTT_DATA_MSG),
		__cpu_to_le32(PIPEDIR_OUT),	/* out = UL = host -> target */
		__cpu_to_le32(4),
	},
	{
		__cpu_to_le32(ATH10K_HTC_SVC_ID_HTT_DATA_MSG),
		__cpu_to_le32(PIPEDIR_IN),	/* in = DL = target -> host */
		__cpu_to_le32(1),
	},
	{ /* not used */
		__cpu_to_le32(ATH10K_HTC_SVC_ID_TEST_RAW_STREAMS),
		__cpu_to_le32(PIPEDIR_OUT),
		__cpu_to_le32(5),
	},
	{ /* in = DL = target -> host */
		__cpu_to_le32(ATH10K_HTC_SVC_ID_HTT_DATA2_MSG),
		__cpu_to_le32(PIPEDIR_IN),	/* in = DL = target -> host */
		__cpu_to_le32(9),
	},
	{ /* in = DL = target -> host */
		__cpu_to_le32(ATH10K_HTC_SVC_ID_HTT_DATA3_MSG),
		__cpu_to_le32(PIPEDIR_IN),	/* in = DL = target -> host */
		__cpu_to_le32(10),
	},
	{ /* in = DL = target -> host pktlog */
		__cpu_to_le32(ATH10K_HTC_SVC_ID_HTT_LOG_MSG),
		__cpu_to_le32(PIPEDIR_IN),	/* in = DL = target -> host */
		__cpu_to_le32(11),
	},
	/* (Additions here) */

	{ /* must be last */
		__cpu_to_le32(0),
		__cpu_to_le32(0),
		__cpu_to_le32(0),
	},
};

void ath10k_snoc_write32(struct ath10k *ar, u32 offset, u32 value)
{
	struct ath10k_snoc *ar_snoc = ath10k_snoc_priv(ar);

	iowrite32(value, ar_snoc->mem + offset);
}

u32 ath10k_snoc_read32(struct ath10k *ar, u32 offset)
{
	struct ath10k_snoc *ar_snoc = ath10k_snoc_priv(ar);
	u32 val;

	val = ioread32(ar_snoc->mem + offset);

	return val;
}

static int __ath10k_snoc_rx_post_buf(struct ath10k_snoc_pipe *pipe)
{
	struct ath10k_ce_pipe *ce_pipe = pipe->ce_hdl;
	struct ath10k *ar = pipe->hif_ce_state;
	struct ath10k_ce *ce = ath10k_ce_priv(ar);
	struct sk_buff *skb;
	dma_addr_t paddr;
	int ret;

	skb = dev_alloc_skb(pipe->buf_sz);
	if (!skb)
		return -ENOMEM;

	WARN_ONCE((unsigned long)skb->data & 3, "unaligned skb");

	paddr = dma_map_single(ar->dev, skb->data,
			       skb->len + skb_tailroom(skb),
			       DMA_FROM_DEVICE);
	if (unlikely(dma_mapping_error(ar->dev, paddr))) {
		ath10k_warn(ar, "failed to dma map snoc rx buf\n");
		dev_kfree_skb_any(skb);
		return -EIO;
	}

	ATH10K_SKB_RXCB(skb)->paddr = paddr;

	spin_lock_bh(&ce->ce_lock);
	ret = ce_pipe->ops->ce_rx_post_buf(ce_pipe, skb, paddr);
	spin_unlock_bh(&ce->ce_lock);
	if (ret) {
		dma_unmap_single(ar->dev, paddr, skb->len + skb_tailroom(skb),
				 DMA_FROM_DEVICE);
		dev_kfree_skb_any(skb);
		return ret;
	}

	return 0;
}

static void ath10k_snoc_rx_post_pipe(struct ath10k_snoc_pipe *pipe)
{
	struct ath10k *ar = pipe->hif_ce_state;
	struct ath10k_ce *ce = ath10k_ce_priv(ar);
	struct ath10k_snoc *ar_snoc = ath10k_snoc_priv(ar);
	struct ath10k_ce_pipe *ce_pipe = pipe->ce_hdl;
	int ret, num;

	if (pipe->buf_sz == 0)
		return;

	if (!ce_pipe->dest_ring)
		return;

	spin_lock_bh(&ce->ce_lock);
	num = __ath10k_ce_rx_num_free_bufs(ce_pipe);
	spin_unlock_bh(&ce->ce_lock);
	while (num--) {
		ret = __ath10k_snoc_rx_post_buf(pipe);
		if (ret) {
			if (ret == -ENOSPC)
				break;
			ath10k_warn(ar, "failed to post rx buf: %d\n", ret);
			mod_timer(&ar_snoc->rx_post_retry, jiffies +
				  ATH10K_SNOC_RX_POST_RETRY_MS);
			break;
		}
	}
}

static void ath10k_snoc_rx_post(struct ath10k *ar)
{
	struct ath10k_snoc *ar_snoc = ath10k_snoc_priv(ar);
	int i;

	for (i = 0; i < CE_COUNT; i++)
		ath10k_snoc_rx_post_pipe(&ar_snoc->pipe_info[i]);
}

static void ath10k_snoc_process_rx_cb(struct ath10k_ce_pipe *ce_state,
				      void (*callback)(struct ath10k *ar,
						       struct sk_buff *skb))
{
	struct ath10k *ar = ce_state->ar;
	struct ath10k_snoc *ar_snoc = ath10k_snoc_priv(ar);
	struct ath10k_snoc_pipe *pipe_info =  &ar_snoc->pipe_info[ce_state->id];
	struct sk_buff *skb;
	struct sk_buff_head list;
	void *transfer_context;
	unsigned int nbytes, max_nbytes;

	__skb_queue_head_init(&list);
	while (ath10k_ce_completed_recv_next(ce_state, &transfer_context,
					     &nbytes) == 0) {
		skb = transfer_context;
		max_nbytes = skb->len + skb_tailroom(skb);
		dma_unmap_single(ar->dev, ATH10K_SKB_RXCB(skb)->paddr,
				 max_nbytes, DMA_FROM_DEVICE);

		if (unlikely(max_nbytes < nbytes)) {
			ath10k_warn(ar, "rxed more than expected (nbytes %d, max %d)",
				    nbytes, max_nbytes);
			dev_kfree_skb_any(skb);
			continue;
		}

		skb_put(skb, nbytes);
		__skb_queue_tail(&list, skb);
	}

	while ((skb = __skb_dequeue(&list))) {
		ath10k_dbg(ar, ATH10K_DBG_SNOC, "snoc rx ce pipe %d len %d\n",
			   ce_state->id, skb->len);

		callback(ar, skb);
	}

	ath10k_snoc_rx_post_pipe(pipe_info);
}

static void ath10k_snoc_htc_rx_cb(struct ath10k_ce_pipe *ce_state)
{
	ath10k_snoc_process_rx_cb(ce_state, ath10k_htc_rx_completion_handler);
}

static void ath10k_snoc_htt_htc_rx_cb(struct ath10k_ce_pipe *ce_state)
{
	/* CE4 polling needs to be done whenever CE pipe which transports
	 * HTT Rx (target->host) is processed.
	 */
	ath10k_ce_per_engine_service(ce_state->ar, CE_POLL_PIPE);

	ath10k_snoc_process_rx_cb(ce_state, ath10k_htc_rx_completion_handler);
}

/* Called by lower (CE) layer when data is received from the Target.
 * WCN3990 firmware uses separate CE(CE11) to transfer pktlog data.
 */
static void ath10k_snoc_pktlog_rx_cb(struct ath10k_ce_pipe *ce_state)
{
	ath10k_snoc_process_rx_cb(ce_state, ath10k_htc_rx_completion_handler);
}

static void ath10k_snoc_htt_rx_deliver(struct ath10k *ar, struct sk_buff *skb)
{
	skb_pull(skb, sizeof(struct ath10k_htc_hdr));
	ath10k_htt_t2h_msg_handler(ar, skb);
}

static void ath10k_snoc_htt_rx_cb(struct ath10k_ce_pipe *ce_state)
{
	ath10k_ce_per_engine_service(ce_state->ar, CE_POLL_PIPE);
	ath10k_snoc_process_rx_cb(ce_state, ath10k_snoc_htt_rx_deliver);
}

static void ath10k_snoc_rx_replenish_retry(struct timer_list *t)
{
	struct ath10k_snoc *ar_snoc = from_timer(ar_snoc, t, rx_post_retry);
	struct ath10k *ar = ar_snoc->ar;

	ath10k_snoc_rx_post(ar);
}

static void ath10k_snoc_htc_tx_cb(struct ath10k_ce_pipe *ce_state)
{
	struct ath10k *ar = ce_state->ar;
	struct sk_buff_head list;
	struct sk_buff *skb;

	__skb_queue_head_init(&list);
	while (ath10k_ce_completed_send_next(ce_state, (void **)&skb) == 0) {
		if (!skb)
			continue;

		__skb_queue_tail(&list, skb);
	}

	while ((skb = __skb_dequeue(&list)))
		ath10k_htc_tx_completion_handler(ar, skb);
}

static void ath10k_snoc_htt_tx_cb(struct ath10k_ce_pipe *ce_state)
{
	struct ath10k *ar = ce_state->ar;
	struct sk_buff *skb;

	while (ath10k_ce_completed_send_next(ce_state, (void **)&skb) == 0) {
		if (!skb)
			continue;

		dma_unmap_single(ar->dev, ATH10K_SKB_CB(skb)->paddr,
				 skb->len, DMA_TO_DEVICE);
		ath10k_htt_hif_tx_complete(ar, skb);
	}
}

static int ath10k_snoc_hif_tx_sg(struct ath10k *ar, u8 pipe_id,
				 struct ath10k_hif_sg_item *items, int n_items)
{
	struct ath10k_snoc *ar_snoc = ath10k_snoc_priv(ar);
	struct ath10k_ce *ce = ath10k_ce_priv(ar);
	struct ath10k_snoc_pipe *snoc_pipe;
	struct ath10k_ce_pipe *ce_pipe;
	int err, i = 0;

	snoc_pipe = &ar_snoc->pipe_info[pipe_id];
	ce_pipe = snoc_pipe->ce_hdl;
	spin_lock_bh(&ce->ce_lock);

	for (i = 0; i < n_items - 1; i++) {
		ath10k_dbg(ar, ATH10K_DBG_SNOC,
			   "snoc tx item %d paddr %pad len %d n_items %d\n",
			   i, &items[i].paddr, items[i].len, n_items);

		err = ath10k_ce_send_nolock(ce_pipe,
					    items[i].transfer_context,
					    items[i].paddr,
					    items[i].len,
					    items[i].transfer_id,
					    CE_SEND_FLAG_GATHER);
		if (err)
			goto err;
	}

	ath10k_dbg(ar, ATH10K_DBG_SNOC,
		   "snoc tx item %d paddr %pad len %d n_items %d\n",
		   i, &items[i].paddr, items[i].len, n_items);

	err = ath10k_ce_send_nolock(ce_pipe,
				    items[i].transfer_context,
				    items[i].paddr,
				    items[i].len,
				    items[i].transfer_id,
				    0);
	if (err)
		goto err;

	spin_unlock_bh(&ce->ce_lock);

	return 0;

err:
	for (; i > 0; i--)
		__ath10k_ce_send_revert(ce_pipe);

	spin_unlock_bh(&ce->ce_lock);
	return err;
}

static int ath10k_snoc_hif_get_target_info(struct ath10k *ar,
					   struct bmi_target_info *target_info)
{
	target_info->version = ATH10K_HW_WCN3990;
	target_info->type = ATH10K_HW_WCN3990;

	return 0;
}

static u16 ath10k_snoc_hif_get_free_queue_number(struct ath10k *ar, u8 pipe)
{
	struct ath10k_snoc *ar_snoc = ath10k_snoc_priv(ar);

	ath10k_dbg(ar, ATH10K_DBG_SNOC, "hif get free queue number\n");

	return ath10k_ce_num_free_src_entries(ar_snoc->pipe_info[pipe].ce_hdl);
}

static void ath10k_snoc_hif_send_complete_check(struct ath10k *ar, u8 pipe,
						int force)
{
	int resources;

	ath10k_dbg(ar, ATH10K_DBG_SNOC, "snoc hif send complete check\n");

	if (!force) {
		resources = ath10k_snoc_hif_get_free_queue_number(ar, pipe);

		if (resources > (host_ce_config_wlan[pipe].src_nentries >> 1))
			return;
	}
	ath10k_ce_per_engine_service(ar, pipe);
}

static int ath10k_snoc_hif_map_service_to_pipe(struct ath10k *ar,
					       u16 service_id,
					       u8 *ul_pipe, u8 *dl_pipe)
{
	const struct service_to_pipe *entry;
	bool ul_set = false, dl_set = false;
	int i;

	ath10k_dbg(ar, ATH10K_DBG_SNOC, "snoc hif map service\n");

	for (i = 0; i < ARRAY_SIZE(target_service_to_ce_map_wlan); i++) {
		entry = &target_service_to_ce_map_wlan[i];

		if (__le32_to_cpu(entry->service_id) != service_id)
			continue;

		switch (__le32_to_cpu(entry->pipedir)) {
		case PIPEDIR_NONE:
			break;
		case PIPEDIR_IN:
			WARN_ON(dl_set);
			*dl_pipe = __le32_to_cpu(entry->pipenum);
			dl_set = true;
			break;
		case PIPEDIR_OUT:
			WARN_ON(ul_set);
			*ul_pipe = __le32_to_cpu(entry->pipenum);
			ul_set = true;
			break;
		case PIPEDIR_INOUT:
			WARN_ON(dl_set);
			WARN_ON(ul_set);
			*dl_pipe = __le32_to_cpu(entry->pipenum);
			*ul_pipe = __le32_to_cpu(entry->pipenum);
			dl_set = true;
			ul_set = true;
			break;
		}
	}

	if (!ul_set || !dl_set)
		return -ENOENT;

	return 0;
}

static void ath10k_snoc_hif_get_default_pipe(struct ath10k *ar,
					     u8 *ul_pipe, u8 *dl_pipe)
{
	ath10k_dbg(ar, ATH10K_DBG_SNOC, "snoc hif get default pipe\n");

	(void)ath10k_snoc_hif_map_service_to_pipe(ar,
						 ATH10K_HTC_SVC_ID_RSVD_CTRL,
						 ul_pipe, dl_pipe);
}

static inline void ath10k_snoc_irq_disable(struct ath10k *ar)
{
	ath10k_ce_disable_interrupts(ar);
}

static inline void ath10k_snoc_irq_enable(struct ath10k *ar)
{
	ath10k_ce_enable_interrupts(ar);
}

static void ath10k_snoc_rx_pipe_cleanup(struct ath10k_snoc_pipe *snoc_pipe)
{
	struct ath10k_ce_pipe *ce_pipe;
	struct ath10k_ce_ring *ce_ring;
	struct sk_buff *skb;
	struct ath10k *ar;
	int i;

	ar = snoc_pipe->hif_ce_state;
	ce_pipe = snoc_pipe->ce_hdl;
	ce_ring = ce_pipe->dest_ring;

	if (!ce_ring)
		return;

	if (!snoc_pipe->buf_sz)
		return;

	for (i = 0; i < ce_ring->nentries; i++) {
		skb = ce_ring->per_transfer_context[i];
		if (!skb)
			continue;

		ce_ring->per_transfer_context[i] = NULL;

		dma_unmap_single(ar->dev, ATH10K_SKB_RXCB(skb)->paddr,
				 skb->len + skb_tailroom(skb),
				 DMA_FROM_DEVICE);
		dev_kfree_skb_any(skb);
	}
}

static void ath10k_snoc_tx_pipe_cleanup(struct ath10k_snoc_pipe *snoc_pipe)
{
	struct ath10k_ce_pipe *ce_pipe;
	struct ath10k_ce_ring *ce_ring;
	struct ath10k_snoc *ar_snoc;
	struct sk_buff *skb;
	struct ath10k *ar;
	int i;

	ar = snoc_pipe->hif_ce_state;
	ar_snoc = ath10k_snoc_priv(ar);
	ce_pipe = snoc_pipe->ce_hdl;
	ce_ring = ce_pipe->src_ring;

	if (!ce_ring)
		return;

	if (!snoc_pipe->buf_sz)
		return;

	for (i = 0; i < ce_ring->nentries; i++) {
		skb = ce_ring->per_transfer_context[i];
		if (!skb)
			continue;

		ce_ring->per_transfer_context[i] = NULL;

		ath10k_htc_tx_completion_handler(ar, skb);
	}
}

static void ath10k_snoc_buffer_cleanup(struct ath10k *ar)
{
	struct ath10k_snoc *ar_snoc = ath10k_snoc_priv(ar);
	struct ath10k_snoc_pipe *pipe_info;
	int pipe_num;

	del_timer_sync(&ar_snoc->rx_post_retry);
	for (pipe_num = 0; pipe_num < CE_COUNT; pipe_num++) {
		pipe_info = &ar_snoc->pipe_info[pipe_num];
		ath10k_snoc_rx_pipe_cleanup(pipe_info);
		ath10k_snoc_tx_pipe_cleanup(pipe_info);
	}
}

static void ath10k_snoc_hif_stop(struct ath10k *ar)
{
	ath10k_snoc_irq_disable(ar);
	napi_synchronize(&ar->napi);
	napi_disable(&ar->napi);
	ath10k_snoc_buffer_cleanup(ar);
	ath10k_dbg(ar, ATH10K_DBG_BOOT, "boot hif stop\n");
}

static int ath10k_snoc_hif_start(struct ath10k *ar)
{
	napi_enable(&ar->napi);
	ath10k_snoc_irq_enable(ar);
	ath10k_snoc_rx_post(ar);

	ath10k_dbg(ar, ATH10K_DBG_BOOT, "boot hif start\n");

	return 0;
}

static int ath10k_snoc_init_pipes(struct ath10k *ar)
{
	int i, ret;

	for (i = 0; i < CE_COUNT; i++) {
		ret = ath10k_ce_init_pipe(ar, i, &host_ce_config_wlan[i]);
		if (ret) {
			ath10k_err(ar, "failed to initialize copy engine pipe %d: %d\n",
				   i, ret);
			return ret;
		}
	}

	return 0;
}

static int ath10k_snoc_wlan_enable(struct ath10k *ar)
{
	return 0;
}

static void ath10k_snoc_wlan_disable(struct ath10k *ar)
{
}

static void ath10k_snoc_hif_power_down(struct ath10k *ar)
{
	ath10k_dbg(ar, ATH10K_DBG_BOOT, "boot hif power down\n");

	ath10k_snoc_wlan_disable(ar);
	ath10k_ce_free_rri(ar);
}

static int ath10k_snoc_hif_power_up(struct ath10k *ar)
{
	int ret;

	ath10k_dbg(ar, ATH10K_DBG_SNOC, "%s:WCN3990 driver state = %d\n",
		   __func__, ar->state);

	ret = ath10k_snoc_wlan_enable(ar);
	if (ret) {
		ath10k_err(ar, "failed to enable wcn3990: %d\n", ret);
		return ret;
	}

	ath10k_ce_alloc_rri(ar);

	ret = ath10k_snoc_init_pipes(ar);
	if (ret) {
		ath10k_err(ar, "failed to initialize CE: %d\n", ret);
		goto err_wlan_enable;
	}

	return 0;

err_wlan_enable:
	ath10k_snoc_wlan_disable(ar);

	return ret;
}

static const struct ath10k_hif_ops ath10k_snoc_hif_ops = {
	.read32		= ath10k_snoc_read32,
	.write32	= ath10k_snoc_write32,
	.start		= ath10k_snoc_hif_start,
	.stop		= ath10k_snoc_hif_stop,
	.map_service_to_pipe	= ath10k_snoc_hif_map_service_to_pipe,
	.get_default_pipe	= ath10k_snoc_hif_get_default_pipe,
	.power_up		= ath10k_snoc_hif_power_up,
	.power_down		= ath10k_snoc_hif_power_down,
	.tx_sg			= ath10k_snoc_hif_tx_sg,
	.send_complete_check	= ath10k_snoc_hif_send_complete_check,
	.get_free_queue_number	= ath10k_snoc_hif_get_free_queue_number,
	.get_target_info	= ath10k_snoc_hif_get_target_info,
};

static const struct ath10k_bus_ops ath10k_snoc_bus_ops = {
	.read32		= ath10k_snoc_read32,
	.write32	= ath10k_snoc_write32,
};

static int ath10k_snoc_get_ce_id_from_irq(struct ath10k *ar, int irq)
{
	struct ath10k_snoc *ar_snoc = ath10k_snoc_priv(ar);
	int i;

	for (i = 0; i < CE_COUNT_MAX; i++) {
		if (ar_snoc->ce_irqs[i].irq_line == irq)
			return i;
	}
	ath10k_err(ar, "No matching CE id for irq %d\n", irq);

	return -EINVAL;
}

static irqreturn_t ath10k_snoc_per_engine_handler(int irq, void *arg)
{
	struct ath10k *ar = arg;
	struct ath10k_snoc *ar_snoc = ath10k_snoc_priv(ar);
	int ce_id = ath10k_snoc_get_ce_id_from_irq(ar, irq);

	if (ce_id < 0 || ce_id >= ARRAY_SIZE(ar_snoc->pipe_info)) {
		ath10k_warn(ar, "unexpected/invalid irq %d ce_id %d\n", irq,
			    ce_id);
		return IRQ_HANDLED;
	}

	ath10k_snoc_irq_disable(ar);
	napi_schedule(&ar->napi);

	return IRQ_HANDLED;
}

static int ath10k_snoc_napi_poll(struct napi_struct *ctx, int budget)
{
	struct ath10k *ar = container_of(ctx, struct ath10k, napi);
	int done = 0;

	ath10k_ce_per_engine_service_any(ar);
	done = ath10k_htt_txrx_compl_task(ar, budget);

	if (done < budget) {
		napi_complete(ctx);
		ath10k_snoc_irq_enable(ar);
	}

	return done;
}

static void ath10k_snoc_init_napi(struct ath10k *ar)
{
	netif_napi_add(&ar->napi_dev, &ar->napi, ath10k_snoc_napi_poll,
		       ATH10K_NAPI_BUDGET);
}

static int ath10k_snoc_request_irq(struct ath10k *ar)
{
	struct ath10k_snoc *ar_snoc = ath10k_snoc_priv(ar);
	int irqflags = IRQF_TRIGGER_RISING;
	int ret, id;

	for (id = 0; id < CE_COUNT_MAX; id++) {
		ret = request_irq(ar_snoc->ce_irqs[id].irq_line,
				  ath10k_snoc_per_engine_handler,
				  irqflags, ce_name[id], ar);
		if (ret) {
			ath10k_err(ar,
				   "failed to register IRQ handler for CE %d: %d",
				   id, ret);
			goto err_irq;
		}
	}

	return 0;

err_irq:
	for (id -= 1; id >= 0; id--)
		free_irq(ar_snoc->ce_irqs[id].irq_line, ar);

	return ret;
}

static void ath10k_snoc_free_irq(struct ath10k *ar)
{
	struct ath10k_snoc *ar_snoc = ath10k_snoc_priv(ar);
	int id;

	for (id = 0; id < CE_COUNT_MAX; id++)
		free_irq(ar_snoc->ce_irqs[id].irq_line, ar);
}

static int ath10k_snoc_resource_init(struct ath10k *ar)
{
	struct ath10k_snoc *ar_snoc = ath10k_snoc_priv(ar);
	struct platform_device *pdev;
	struct resource *res;
	int i, ret = 0;

	pdev = ar_snoc->dev;
	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "membase");
	if (!res) {
		ath10k_err(ar, "Memory base not found in DT\n");
		return -EINVAL;
	}

	ar_snoc->mem_pa = res->start;
	ar_snoc->mem = devm_ioremap(&pdev->dev, ar_snoc->mem_pa,
				    resource_size(res));
	if (!ar_snoc->mem) {
		ath10k_err(ar, "Memory base ioremap failed with physical address %pa\n",
			   &ar_snoc->mem_pa);
		return -EINVAL;
	}

	for (i = 0; i < CE_COUNT; i++) {
		res = platform_get_resource(ar_snoc->dev, IORESOURCE_IRQ, i);
		if (!res) {
			ath10k_err(ar, "failed to get IRQ%d\n", i);
			ret = -ENODEV;
			goto out;
		}
		ar_snoc->ce_irqs[i].irq_line = res->start;
	}

out:
	return ret;
}

static int ath10k_snoc_setup_resource(struct ath10k *ar)
{
	struct ath10k_snoc *ar_snoc = ath10k_snoc_priv(ar);
	struct ath10k_ce *ce = ath10k_ce_priv(ar);
	struct ath10k_snoc_pipe *pipe;
	int i, ret;

	timer_setup(&ar_snoc->rx_post_retry, ath10k_snoc_rx_replenish_retry, 0);
	spin_lock_init(&ce->ce_lock);
	for (i = 0; i < CE_COUNT; i++) {
		pipe = &ar_snoc->pipe_info[i];
		pipe->ce_hdl = &ce->ce_states[i];
		pipe->pipe_num = i;
		pipe->hif_ce_state = ar;

		ret = ath10k_ce_alloc_pipe(ar, i, &host_ce_config_wlan[i]);
		if (ret) {
			ath10k_err(ar, "failed to allocate copy engine pipe %d: %d\n",
				   i, ret);
			return ret;
		}

		pipe->buf_sz = host_ce_config_wlan[i].src_sz_max;
	}
	ath10k_snoc_init_napi(ar);

	return 0;
}

static void ath10k_snoc_release_resource(struct ath10k *ar)
{
	int i;

	netif_napi_del(&ar->napi);
	for (i = 0; i < CE_COUNT; i++)
		ath10k_ce_free_pipe(ar, i);
}

static int ath10k_get_vreg_info(struct ath10k *ar, struct device *dev,
				struct ath10k_wcn3990_vreg_info *vreg_info)
{
	struct regulator *reg;
	int ret = 0;

	reg = devm_regulator_get_optional(dev, vreg_info->name);

	if (IS_ERR(reg)) {
		ret = PTR_ERR(reg);

		if (ret  == -EPROBE_DEFER) {
			ath10k_err(ar, "EPROBE_DEFER for regulator: %s\n",
				   vreg_info->name);
			return ret;
		}
		if (vreg_info->required) {
			ath10k_err(ar, "Regulator %s doesn't exist: %d\n",
				   vreg_info->name, ret);
			return ret;
		}
		ath10k_dbg(ar, ATH10K_DBG_SNOC,
			   "Optional regulator %s doesn't exist: %d\n",
			   vreg_info->name, ret);
		goto done;
	}

	vreg_info->reg = reg;

done:
	ath10k_dbg(ar, ATH10K_DBG_SNOC,
		   "snog vreg %s min_v %u max_v %u load_ua %u settle_delay %lu\n",
		   vreg_info->name, vreg_info->min_v, vreg_info->max_v,
		   vreg_info->load_ua, vreg_info->settle_delay);

	return 0;
}

static int ath10k_get_clk_info(struct ath10k *ar, struct device *dev,
			       struct ath10k_wcn3990_clk_info *clk_info)
{
	struct clk *handle;
	int ret = 0;

	handle = devm_clk_get(dev, clk_info->name);
	if (IS_ERR(handle)) {
		ret = PTR_ERR(handle);
		if (clk_info->required) {
			ath10k_err(ar, "snoc clock %s isn't available: %d\n",
				   clk_info->name, ret);
			return ret;
		}
		ath10k_dbg(ar, ATH10K_DBG_SNOC, "snoc ignoring clock %s: %d\n",
			   clk_info->name,
			   ret);
		return 0;
	}

	ath10k_dbg(ar, ATH10K_DBG_SNOC, "snoc clock %s freq %u\n",
		   clk_info->name, clk_info->freq);

	clk_info->handle = handle;

	return ret;
}

static int ath10k_wcn3990_vreg_on(struct ath10k *ar)
{
	struct ath10k_snoc *ar_snoc = ath10k_snoc_priv(ar);
	struct ath10k_wcn3990_vreg_info *vreg_info;
	int ret = 0;
	int i;

	for (i = 0; i < ARRAY_SIZE(vreg_cfg); i++) {
		vreg_info = &ar_snoc->vreg[i];

		if (!vreg_info->reg)
			continue;

		ath10k_dbg(ar, ATH10K_DBG_SNOC, "snoc regulator %s being enabled\n",
			   vreg_info->name);

		ret = regulator_set_voltage(vreg_info->reg, vreg_info->min_v,
					    vreg_info->max_v);
		if (ret) {
			ath10k_err(ar,
				   "failed to set regulator %s voltage-min: %d voltage-max: %d\n",
				   vreg_info->name, vreg_info->min_v, vreg_info->max_v);
			goto err_reg_config;
		}

		if (vreg_info->load_ua) {
			ret = regulator_set_load(vreg_info->reg,
						 vreg_info->load_ua);
			if (ret < 0) {
				ath10k_err(ar,
					   "failed to set regulator %s load: %d\n",
					   vreg_info->name,
					   vreg_info->load_ua);
				goto err_reg_config;
			}
		}

		ret = regulator_enable(vreg_info->reg);
		if (ret) {
			ath10k_err(ar, "failed to enable regulator %s\n",
				   vreg_info->name);
			goto err_reg_config;
		}

		if (vreg_info->settle_delay)
			udelay(vreg_info->settle_delay);
	}

	return 0;

err_reg_config:
	for (; i >= 0; i--) {
		vreg_info = &ar_snoc->vreg[i];

		if (!vreg_info->reg)
			continue;

		regulator_disable(vreg_info->reg);
		regulator_set_load(vreg_info->reg, 0);
		regulator_set_voltage(vreg_info->reg, 0, vreg_info->max_v);
	}

	return ret;
}

static int ath10k_wcn3990_vreg_off(struct ath10k *ar)
{
	struct ath10k_snoc *ar_snoc = ath10k_snoc_priv(ar);
	struct ath10k_wcn3990_vreg_info *vreg_info;
	int ret = 0;
	int i;

	for (i = ARRAY_SIZE(vreg_cfg) - 1; i >= 0; i--) {
		vreg_info = &ar_snoc->vreg[i];

		if (!vreg_info->reg)
			continue;

		ath10k_dbg(ar, ATH10K_DBG_SNOC, "snoc regulator %s being disabled\n",
			   vreg_info->name);

		ret = regulator_disable(vreg_info->reg);
		if (ret)
			ath10k_err(ar, "failed to disable regulator %s\n",
				   vreg_info->name);

		ret = regulator_set_load(vreg_info->reg, 0);
		if (ret < 0)
			ath10k_err(ar, "failed to set load %s\n",
				   vreg_info->name);

		ret = regulator_set_voltage(vreg_info->reg, 0,
					    vreg_info->max_v);
		if (ret)
			ath10k_err(ar, "failed to set voltage %s\n",
				   vreg_info->name);
	}

	return ret;
}

static int ath10k_wcn3990_clk_init(struct ath10k *ar)
{
	struct ath10k_snoc *ar_snoc = ath10k_snoc_priv(ar);
	struct ath10k_wcn3990_clk_info *clk_info;
	int ret = 0;
	int i;

	for (i = 0; i < ARRAY_SIZE(clk_cfg); i++) {
		clk_info = &ar_snoc->clk[i];

		if (!clk_info->handle)
			continue;

		ath10k_dbg(ar, ATH10K_DBG_SNOC, "snoc clock %s being enabled\n",
			   clk_info->name);

		if (clk_info->freq) {
			ret = clk_set_rate(clk_info->handle, clk_info->freq);

			if (ret) {
				ath10k_err(ar, "failed to set clock %s freq %u\n",
					   clk_info->name, clk_info->freq);
				goto err_clock_config;
			}
		}

		ret = clk_prepare_enable(clk_info->handle);
		if (ret) {
			ath10k_err(ar, "failed to enable clock %s\n",
				   clk_info->name);
			goto err_clock_config;
		}
	}

	return 0;

err_clock_config:
	for (; i >= 0; i--) {
		clk_info = &ar_snoc->clk[i];

		if (!clk_info->handle)
			continue;

		clk_disable_unprepare(clk_info->handle);
	}

	return ret;
}

static int ath10k_wcn3990_clk_deinit(struct ath10k *ar)
{
	struct ath10k_snoc *ar_snoc = ath10k_snoc_priv(ar);
	struct ath10k_wcn3990_clk_info *clk_info;
	int i;

	for (i = 0; i < ARRAY_SIZE(clk_cfg); i++) {
		clk_info = &ar_snoc->clk[i];

		if (!clk_info->handle)
			continue;

		ath10k_dbg(ar, ATH10K_DBG_SNOC, "snoc clock %s being disabled\n",
			   clk_info->name);

		clk_disable_unprepare(clk_info->handle);
	}

	return 0;
}

static int ath10k_hw_power_on(struct ath10k *ar)
{
	int ret;

	ath10k_dbg(ar, ATH10K_DBG_SNOC, "soc power on\n");

	ret = ath10k_wcn3990_vreg_on(ar);
	if (ret)
		return ret;

	ret = ath10k_wcn3990_clk_init(ar);
	if (ret)
		goto vreg_off;

	return ret;

vreg_off:
	ath10k_wcn3990_vreg_off(ar);
	return ret;
}

static int ath10k_hw_power_off(struct ath10k *ar)
{
	int ret;

	ath10k_dbg(ar, ATH10K_DBG_SNOC, "soc power off\n");

	ath10k_wcn3990_clk_deinit(ar);

	ret = ath10k_wcn3990_vreg_off(ar);

	return ret;
}

static const struct of_device_id ath10k_snoc_dt_match[] = {
	{ .compatible = "qcom,wcn3990-wifi",
	 .data = &drv_priv,
	},
	{ }
};
MODULE_DEVICE_TABLE(of, ath10k_snoc_dt_match);

static int ath10k_snoc_probe(struct platform_device *pdev)
{
	const struct ath10k_snoc_drv_priv *drv_data;
	const struct of_device_id *of_id;
	struct ath10k_snoc *ar_snoc;
	struct device *dev;
	struct ath10k *ar;
	int ret;
	u32 i;
	struct ath10k_bus_params bus_params;

	of_id = of_match_device(ath10k_snoc_dt_match, &pdev->dev);
	if (!of_id) {
		dev_err(&pdev->dev, "failed to find matching device tree id\n");
		return -EINVAL;
	}

	drv_data = of_id->data;
	dev = &pdev->dev;

	ret = dma_set_mask_and_coherent(dev, drv_data->dma_mask);
	if (ret) {
		dev_err(dev, "failed to set dma mask: %d", ret);
		return ret;
	}

	ar = ath10k_core_create(sizeof(*ar_snoc), dev, ATH10K_BUS_SNOC,
				drv_data->hw_rev, &ath10k_snoc_hif_ops);
	if (!ar) {
		dev_err(dev, "failed to allocate core\n");
		return -ENOMEM;
	}

	ar_snoc = ath10k_snoc_priv(ar);
	ar_snoc->dev = pdev;
	platform_set_drvdata(pdev, ar);
	ar_snoc->ar = ar;
	ar_snoc->ce.bus_ops = &ath10k_snoc_bus_ops;
	ar->ce_priv = &ar_snoc->ce;

	ret = ath10k_snoc_resource_init(ar);
	if (ret) {
		ath10k_warn(ar, "failed to initialize resource: %d\n", ret);
		goto err_core_destroy;
	}

	ret = ath10k_snoc_setup_resource(ar);
	if (ret) {
		ath10k_warn(ar, "failed to setup resource: %d\n", ret);
		goto err_core_destroy;
	}
	ret = ath10k_snoc_request_irq(ar);
	if (ret) {
		ath10k_warn(ar, "failed to request irqs: %d\n", ret);
		goto err_release_resource;
	}

	ar_snoc->vreg = vreg_cfg;
	for (i = 0; i < ARRAY_SIZE(vreg_cfg); i++) {
		ret = ath10k_get_vreg_info(ar, dev, &ar_snoc->vreg[i]);
		if (ret)
			goto err_free_irq;
	}

	ar_snoc->clk = clk_cfg;
	for (i = 0; i < ARRAY_SIZE(clk_cfg); i++) {
		ret = ath10k_get_clk_info(ar, dev, &ar_snoc->clk[i]);
		if (ret)
			goto err_free_irq;
	}

	ret = ath10k_hw_power_on(ar);
	if (ret) {
		ath10k_err(ar, "failed to power on device: %d\n", ret);
		goto err_free_irq;
	}

	bus_params.dev_type = ATH10K_DEV_TYPE_LL;
	bus_params.chip_id = drv_data->hw_rev;
	ret = ath10k_core_register(ar, &bus_params);
	if (ret) {
		ath10k_err(ar, "failed to register driver core: %d\n", ret);
		goto err_hw_power_off;
	}

	ath10k_dbg(ar, ATH10K_DBG_SNOC, "snoc probe\n");
	ath10k_warn(ar, "Warning: SNOC support is still work-in-progress, it will not work properly!");

	return 0;

err_hw_power_off:
	ath10k_hw_power_off(ar);

err_free_irq:
	ath10k_snoc_free_irq(ar);

err_release_resource:
	ath10k_snoc_release_resource(ar);

err_core_destroy:
	ath10k_core_destroy(ar);

	return ret;
}

static int ath10k_snoc_remove(struct platform_device *pdev)
{
	struct ath10k *ar = platform_get_drvdata(pdev);

	ath10k_dbg(ar, ATH10K_DBG_SNOC, "snoc remove\n");
	ath10k_core_unregister(ar);
	ath10k_hw_power_off(ar);
	ath10k_snoc_free_irq(ar);
	ath10k_snoc_release_resource(ar);
	ath10k_core_destroy(ar);

	return 0;
}

static struct platform_driver ath10k_snoc_driver = {
		.probe  = ath10k_snoc_probe,
		.remove = ath10k_snoc_remove,
		.driver = {
			.name   = "ath10k_snoc",
			.of_match_table = ath10k_snoc_dt_match,
		},
};
module_platform_driver(ath10k_snoc_driver);

MODULE_AUTHOR("Qualcomm");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION("Driver support for Atheros WCN3990 SNOC devices");
