/*
 * Copyright (c) 2005-2011 Atheros Communications Inc.
 * Copyright (c) 2011-2017 Qualcomm Atheros, Inc.
 *
 * 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 "hif.h"
#include "ce.h"
#include "debug.h"

/*
 * Support for Copy Engine hardware, which is mainly used for
 * communication between Host and Target over a PCIe interconnect.
 */

/*
 * A single CopyEngine (CE) comprises two "rings":
 *   a source ring
 *   a destination ring
 *
 * Each ring consists of a number of descriptors which specify
 * an address, length, and meta-data.
 *
 * Typically, one side of the PCIe/AHB/SNOC interconnect (Host or Target)
 * controls one ring and the other side controls the other ring.
 * The source side chooses when to initiate a transfer and it
 * chooses what to send (buffer address, length). The destination
 * side keeps a supply of "anonymous receive buffers" available and
 * it handles incoming data as it arrives (when the destination
 * receives an interrupt).
 *
 * The sender may send a simple buffer (address/length) or it may
 * send a small list of buffers.  When a small list is sent, hardware
 * "gathers" these and they end up in a single destination buffer
 * with a single interrupt.
 *
 * There are several "contexts" managed by this layer -- more, it
 * may seem -- than should be needed. These are provided mainly for
 * maximum flexibility and especially to facilitate a simpler HIF
 * implementation. There are per-CopyEngine recv, send, and watermark
 * contexts. These are supplied by the caller when a recv, send,
 * or watermark handler is established and they are echoed back to
 * the caller when the respective callbacks are invoked. There is
 * also a per-transfer context supplied by the caller when a buffer
 * (or sendlist) is sent and when a buffer is enqueued for recv.
 * These per-transfer contexts are echoed back to the caller when
 * the buffer is sent/received.
 */

static inline unsigned int
ath10k_set_ring_byte(unsigned int offset,
                     struct ath10k_hw_ce_regs_addr_map *addr_map)
{
        return ((offset << addr_map->lsb) & addr_map->mask);
}

static inline unsigned int
ath10k_get_ring_byte(unsigned int offset,
                     struct ath10k_hw_ce_regs_addr_map *addr_map)
{
        return ((offset & addr_map->mask) >> (addr_map->lsb));
}

static inline u32 ath10k_ce_read32(struct ath10k *ar, u32 offset)
{
        struct ath10k_ce *ce = ath10k_ce_priv(ar);

        return ce->bus_ops->read32(ar, offset);
}

static inline void ath10k_ce_write32(struct ath10k *ar, u32 offset, u32 value)
{
        struct ath10k_ce *ce = ath10k_ce_priv(ar);

        ce->bus_ops->write32(ar, offset, value);
}

static inline void ath10k_ce_dest_ring_write_index_set(struct ath10k *ar,
                                                       u32 ce_ctrl_addr,
                                                       unsigned int n)
{
        ath10k_ce_write32(ar, ce_ctrl_addr +
                          ar->hw_ce_regs->dst_wr_index_addr, n);
}

static inline u32 ath10k_ce_dest_ring_write_index_get(struct ath10k *ar,
                                                      u32 ce_ctrl_addr)
{
        return ath10k_ce_read32(ar, ce_ctrl_addr +
                                ar->hw_ce_regs->dst_wr_index_addr);
}

static inline void ath10k_ce_src_ring_write_index_set(struct ath10k *ar,
                                                      u32 ce_ctrl_addr,
                                                      unsigned int n)
{
        ath10k_ce_write32(ar, ce_ctrl_addr +
                          ar->hw_ce_regs->sr_wr_index_addr, n);
}

static inline u32 ath10k_ce_src_ring_write_index_get(struct ath10k *ar,
                                                     u32 ce_ctrl_addr)
{
        return ath10k_ce_read32(ar, ce_ctrl_addr +
                                ar->hw_ce_regs->sr_wr_index_addr);
}

static inline u32 ath10k_ce_src_ring_read_index_get(struct ath10k *ar,
                                                    u32 ce_ctrl_addr)
{
        return ath10k_ce_read32(ar, ce_ctrl_addr +
                                ar->hw_ce_regs->current_srri_addr);
}

static inline void ath10k_ce_src_ring_base_addr_set(struct ath10k *ar,
                                                    u32 ce_ctrl_addr,
                                                    unsigned int addr)
{
        ath10k_ce_write32(ar, ce_ctrl_addr +
                          ar->hw_ce_regs->sr_base_addr, addr);
}

static inline void ath10k_ce_src_ring_size_set(struct ath10k *ar,
                                               u32 ce_ctrl_addr,
                                               unsigned int n)
{
        ath10k_ce_write32(ar, ce_ctrl_addr +
                          ar->hw_ce_regs->sr_size_addr, n);
}

static inline void ath10k_ce_src_ring_dmax_set(struct ath10k *ar,
                                               u32 ce_ctrl_addr,
                                               unsigned int n)
{
        struct ath10k_hw_ce_ctrl1 *ctrl_regs = ar->hw_ce_regs->ctrl1_regs;

        u32 ctrl1_addr = ath10k_ce_read32(ar, ce_ctrl_addr +
                                          ctrl_regs->addr);

        ath10k_ce_write32(ar, ce_ctrl_addr + ctrl_regs->addr,
                          (ctrl1_addr &  ~(ctrl_regs->dmax->mask)) |
                          ath10k_set_ring_byte(n, ctrl_regs->dmax));
}

static inline void ath10k_ce_src_ring_byte_swap_set(struct ath10k *ar,
                                                    u32 ce_ctrl_addr,
                                                    unsigned int n)
{
        struct ath10k_hw_ce_ctrl1 *ctrl_regs = ar->hw_ce_regs->ctrl1_regs;

        u32 ctrl1_addr = ath10k_ce_read32(ar, ce_ctrl_addr +
                                          ctrl_regs->addr);

        ath10k_ce_write32(ar, ce_ctrl_addr + ctrl_regs->addr,
                          (ctrl1_addr & ~(ctrl_regs->src_ring->mask)) |
                          ath10k_set_ring_byte(n, ctrl_regs->src_ring));
}

static inline void ath10k_ce_dest_ring_byte_swap_set(struct ath10k *ar,
                                                     u32 ce_ctrl_addr,
                                                     unsigned int n)
{
        struct ath10k_hw_ce_ctrl1 *ctrl_regs = ar->hw_ce_regs->ctrl1_regs;

        u32 ctrl1_addr = ath10k_ce_read32(ar, ce_ctrl_addr +
                                          ctrl_regs->addr);

        ath10k_ce_write32(ar, ce_ctrl_addr + ctrl_regs->addr,
                          (ctrl1_addr & ~(ctrl_regs->dst_ring->mask)) |
                          ath10k_set_ring_byte(n, ctrl_regs->dst_ring));
}

static inline u32 ath10k_ce_dest_ring_read_index_get(struct ath10k *ar,
                                                     u32 ce_ctrl_addr)
{
        return ath10k_ce_read32(ar, ce_ctrl_addr +
                                ar->hw_ce_regs->current_drri_addr);
}

static inline void ath10k_ce_dest_ring_base_addr_set(struct ath10k *ar,
                                                     u32 ce_ctrl_addr,
                                                     u32 addr)
{
        ath10k_ce_write32(ar, ce_ctrl_addr +
                          ar->hw_ce_regs->dr_base_addr, addr);
}

static inline void ath10k_ce_dest_ring_size_set(struct ath10k *ar,
                                                u32 ce_ctrl_addr,
                                                unsigned int n)
{
        ath10k_ce_write32(ar, ce_ctrl_addr +
                          ar->hw_ce_regs->dr_size_addr, n);
}

static inline void ath10k_ce_src_ring_highmark_set(struct ath10k *ar,
                                                   u32 ce_ctrl_addr,
                                                   unsigned int n)
{
        struct ath10k_hw_ce_dst_src_wm_regs *srcr_wm = ar->hw_ce_regs->wm_srcr;
        u32 addr = ath10k_ce_read32(ar, ce_ctrl_addr + srcr_wm->addr);

        ath10k_ce_write32(ar, ce_ctrl_addr + srcr_wm->addr,
                          (addr & ~(srcr_wm->wm_high->mask)) |
                          (ath10k_set_ring_byte(n, srcr_wm->wm_high)));
}

static inline void ath10k_ce_src_ring_lowmark_set(struct ath10k *ar,
                                                  u32 ce_ctrl_addr,
                                                  unsigned int n)
{
        struct ath10k_hw_ce_dst_src_wm_regs *srcr_wm = ar->hw_ce_regs->wm_srcr;
        u32 addr = ath10k_ce_read32(ar, ce_ctrl_addr + srcr_wm->addr);

        ath10k_ce_write32(ar, ce_ctrl_addr + srcr_wm->addr,
                          (addr & ~(srcr_wm->wm_low->mask)) |
                          (ath10k_set_ring_byte(n, srcr_wm->wm_low)));
}

static inline void ath10k_ce_dest_ring_highmark_set(struct ath10k *ar,
                                                    u32 ce_ctrl_addr,
                                                    unsigned int n)
{
        struct ath10k_hw_ce_dst_src_wm_regs *dstr_wm = ar->hw_ce_regs->wm_dstr;
        u32 addr = ath10k_ce_read32(ar, ce_ctrl_addr + dstr_wm->addr);

        ath10k_ce_write32(ar, ce_ctrl_addr + dstr_wm->addr,
                          (addr & ~(dstr_wm->wm_high->mask)) |
                          (ath10k_set_ring_byte(n, dstr_wm->wm_high)));
}

static inline void ath10k_ce_dest_ring_lowmark_set(struct ath10k *ar,
                                                   u32 ce_ctrl_addr,
                                                   unsigned int n)
{
        struct ath10k_hw_ce_dst_src_wm_regs *dstr_wm = ar->hw_ce_regs->wm_dstr;
        u32 addr = ath10k_ce_read32(ar, ce_ctrl_addr + dstr_wm->addr);

        ath10k_ce_write32(ar, ce_ctrl_addr + dstr_wm->addr,
                          (addr & ~(dstr_wm->wm_low->mask)) |
                          (ath10k_set_ring_byte(n, dstr_wm->wm_low)));
}

static inline void ath10k_ce_copy_complete_inter_enable(struct ath10k *ar,
                                                        u32 ce_ctrl_addr)
{
        struct ath10k_hw_ce_host_ie *host_ie = ar->hw_ce_regs->host_ie;

        u32 host_ie_addr = ath10k_ce_read32(ar, ce_ctrl_addr +
                                            ar->hw_ce_regs->host_ie_addr);

        ath10k_ce_write32(ar, ce_ctrl_addr + ar->hw_ce_regs->host_ie_addr,
                          host_ie_addr | host_ie->copy_complete->mask);
}

static inline void ath10k_ce_copy_complete_intr_disable(struct ath10k *ar,
                                                        u32 ce_ctrl_addr)
{
        struct ath10k_hw_ce_host_ie *host_ie = ar->hw_ce_regs->host_ie;

        u32 host_ie_addr = ath10k_ce_read32(ar, ce_ctrl_addr +
                                            ar->hw_ce_regs->host_ie_addr);

        ath10k_ce_write32(ar, ce_ctrl_addr + ar->hw_ce_regs->host_ie_addr,
                          host_ie_addr & ~(host_ie->copy_complete->mask));
}

static inline void ath10k_ce_watermark_intr_disable(struct ath10k *ar,
                                                    u32 ce_ctrl_addr)
{
        struct ath10k_hw_ce_host_wm_regs *wm_regs = ar->hw_ce_regs->wm_regs;

        u32 host_ie_addr = ath10k_ce_read32(ar, ce_ctrl_addr +
                                            ar->hw_ce_regs->host_ie_addr);

        ath10k_ce_write32(ar, ce_ctrl_addr + ar->hw_ce_regs->host_ie_addr,
                          host_ie_addr & ~(wm_regs->wm_mask));
}

static inline void ath10k_ce_error_intr_enable(struct ath10k *ar,
                                               u32 ce_ctrl_addr)
{
        struct ath10k_hw_ce_misc_regs *misc_regs = ar->hw_ce_regs->misc_regs;

        u32 misc_ie_addr = ath10k_ce_read32(ar, ce_ctrl_addr +
                                            ar->hw_ce_regs->misc_ie_addr);

        ath10k_ce_write32(ar,
                          ce_ctrl_addr + ar->hw_ce_regs->misc_ie_addr,
                          misc_ie_addr | misc_regs->err_mask);
}

static inline void ath10k_ce_error_intr_disable(struct ath10k *ar,
                                                u32 ce_ctrl_addr)
{
        struct ath10k_hw_ce_misc_regs *misc_regs = ar->hw_ce_regs->misc_regs;

        u32 misc_ie_addr = ath10k_ce_read32(ar,
                        ce_ctrl_addr + ar->hw_ce_regs->misc_ie_addr);

        ath10k_ce_write32(ar,
                          ce_ctrl_addr + ar->hw_ce_regs->misc_ie_addr,
                          misc_ie_addr & ~(misc_regs->err_mask));
}

static inline void ath10k_ce_engine_int_status_clear(struct ath10k *ar,
                                                     u32 ce_ctrl_addr,
                                                     unsigned int mask)
{
        struct ath10k_hw_ce_host_wm_regs *wm_regs = ar->hw_ce_regs->wm_regs;

        ath10k_ce_write32(ar, ce_ctrl_addr + wm_regs->addr, mask);
}

/*
 * Guts of ath10k_ce_send.
 * The caller takes responsibility for any needed locking.
 */
static int _ath10k_ce_send_nolock(struct ath10k_ce_pipe *ce_state,
                                  void *per_transfer_context,
                                  dma_addr_t buffer,
                                  unsigned int nbytes,
                                  unsigned int transfer_id,
                                  unsigned int flags)
{
        struct ath10k *ar = ce_state->ar;
        struct ath10k_ce_ring *src_ring = ce_state->src_ring;
        struct ce_desc *desc, sdesc;
        unsigned int nentries_mask = src_ring->nentries_mask;
        unsigned int sw_index = src_ring->sw_index;
        unsigned int write_index = src_ring->write_index;
        u32 ctrl_addr = ce_state->ctrl_addr;
        u32 desc_flags = 0;
        int ret = 0;

        if (nbytes > ce_state->src_sz_max)
                ath10k_warn(ar, "%s: send more we can (nbytes: %d, max: %d)\n",
                            __func__, nbytes, ce_state->src_sz_max);

        if (unlikely(CE_RING_DELTA(nentries_mask,
                                   write_index, sw_index - 1) <= 0)) {
                ret = -ENOSR;
                goto exit;
        }

        desc = CE_SRC_RING_TO_DESC(src_ring->base_addr_owner_space,
                                   write_index);

        desc_flags |= SM(transfer_id, CE_DESC_FLAGS_META_DATA);

        if (flags & CE_SEND_FLAG_GATHER)
                desc_flags |= CE_DESC_FLAGS_GATHER;
        if (flags & CE_SEND_FLAG_BYTE_SWAP)
                desc_flags |= CE_DESC_FLAGS_BYTE_SWAP;

        sdesc.addr   = __cpu_to_le32(buffer);
        sdesc.nbytes = __cpu_to_le16(nbytes);
        sdesc.flags  = __cpu_to_le16(desc_flags);

        *desc = sdesc;

        src_ring->per_transfer_context[write_index] = per_transfer_context;

        /* Update Source Ring Write Index */
        write_index = CE_RING_IDX_INCR(nentries_mask, write_index);

        /* WORKAROUND */
        if (!(flags & CE_SEND_FLAG_GATHER))
                ath10k_ce_src_ring_write_index_set(ar, ctrl_addr, write_index);

        src_ring->write_index = write_index;
exit:
        return ret;
}

static int _ath10k_ce_send_nolock_64(struct ath10k_ce_pipe *ce_state,
                                     void *per_transfer_context,
                                     dma_addr_t buffer,
                                     unsigned int nbytes,
                                     unsigned int transfer_id,
                                     unsigned int flags)
{
        struct ath10k *ar = ce_state->ar;
        struct ath10k_ce_ring *src_ring = ce_state->src_ring;
        struct ce_desc_64 *desc, sdesc;
        unsigned int nentries_mask = src_ring->nentries_mask;
        unsigned int sw_index = src_ring->sw_index;
        unsigned int write_index = src_ring->write_index;
        u32 ctrl_addr = ce_state->ctrl_addr;
        __le32 *addr;
        u32 desc_flags = 0;
        int ret = 0;

        if (test_bit(ATH10K_FLAG_CRASH_FLUSH, &ar->dev_flags))
                return -ESHUTDOWN;

        if (nbytes > ce_state->src_sz_max)
                ath10k_warn(ar, "%s: send more we can (nbytes: %d, max: %d)\n",
                            __func__, nbytes, ce_state->src_sz_max);

        if (unlikely(CE_RING_DELTA(nentries_mask,
                                   write_index, sw_index - 1) <= 0)) {
                ret = -ENOSR;
                goto exit;
        }

        desc = CE_SRC_RING_TO_DESC_64(src_ring->base_addr_owner_space,
                                      write_index);

        desc_flags |= SM(transfer_id, CE_DESC_FLAGS_META_DATA);

        if (flags & CE_SEND_FLAG_GATHER)
                desc_flags |= CE_DESC_FLAGS_GATHER;

        if (flags & CE_SEND_FLAG_BYTE_SWAP)
                desc_flags |= CE_DESC_FLAGS_BYTE_SWAP;

        addr = (__le32 *)&sdesc.addr;

        flags |= upper_32_bits(buffer) & CE_DESC_FLAGS_GET_MASK;
        addr[0] = __cpu_to_le32(buffer);
        addr[1] = __cpu_to_le32(flags);
        if (flags & CE_SEND_FLAG_GATHER)
                addr[1] |= __cpu_to_le32(CE_WCN3990_DESC_FLAGS_GATHER);
        else
                addr[1] &= ~(__cpu_to_le32(CE_WCN3990_DESC_FLAGS_GATHER));

        sdesc.nbytes = __cpu_to_le16(nbytes);
        sdesc.flags  = __cpu_to_le16(desc_flags);

        *desc = sdesc;

        src_ring->per_transfer_context[write_index] = per_transfer_context;

        /* Update Source Ring Write Index */
        write_index = CE_RING_IDX_INCR(nentries_mask, write_index);

        if (!(flags & CE_SEND_FLAG_GATHER))
                ath10k_ce_src_ring_write_index_set(ar, ctrl_addr, write_index);

        src_ring->write_index = write_index;
exit:
        return ret;
}

int ath10k_ce_send_nolock(struct ath10k_ce_pipe *ce_state,
                          void *per_transfer_context,
                          dma_addr_t buffer,
                          unsigned int nbytes,
                          unsigned int transfer_id,
                          unsigned int flags)
{
        return ce_state->ops->ce_send_nolock(ce_state, per_transfer_context,
                                    buffer, nbytes, transfer_id, flags);
}

void __ath10k_ce_send_revert(struct ath10k_ce_pipe *pipe)
{
        struct ath10k *ar = pipe->ar;
        struct ath10k_ce *ce = ath10k_ce_priv(ar);
        struct ath10k_ce_ring *src_ring = pipe->src_ring;
        u32 ctrl_addr = pipe->ctrl_addr;

        lockdep_assert_held(&ce->ce_lock);

        /*
         * This function must be called only if there is an incomplete
         * scatter-gather transfer (before index register is updated)
         * that needs to be cleaned up.
         */
        if (WARN_ON_ONCE(src_ring->write_index == src_ring->sw_index))
                return;

        if (WARN_ON_ONCE(src_ring->write_index ==
                         ath10k_ce_src_ring_write_index_get(ar, ctrl_addr)))
                return;

        src_ring->write_index--;
        src_ring->write_index &= src_ring->nentries_mask;

        src_ring->per_transfer_context[src_ring->write_index] = NULL;
}

int ath10k_ce_send(struct ath10k_ce_pipe *ce_state,
                   void *per_transfer_context,
                   dma_addr_t buffer,
                   unsigned int nbytes,
                   unsigned int transfer_id,
                   unsigned int flags)
{
        struct ath10k *ar = ce_state->ar;
        struct ath10k_ce *ce = ath10k_ce_priv(ar);
        int ret;

        spin_lock_bh(&ce->ce_lock);
        ret = ath10k_ce_send_nolock(ce_state, per_transfer_context,
                                    buffer, nbytes, transfer_id, flags);
        spin_unlock_bh(&ce->ce_lock);

        return ret;
}

int ath10k_ce_num_free_src_entries(struct ath10k_ce_pipe *pipe)
{
        struct ath10k *ar = pipe->ar;
        struct ath10k_ce *ce = ath10k_ce_priv(ar);
        int delta;

        spin_lock_bh(&ce->ce_lock);
        delta = CE_RING_DELTA(pipe->src_ring->nentries_mask,
                              pipe->src_ring->write_index,
                              pipe->src_ring->sw_index - 1);
        spin_unlock_bh(&ce->ce_lock);

        return delta;
}

int __ath10k_ce_rx_num_free_bufs(struct ath10k_ce_pipe *pipe)
{
        struct ath10k *ar = pipe->ar;
        struct ath10k_ce *ce = ath10k_ce_priv(ar);
        struct ath10k_ce_ring *dest_ring = pipe->dest_ring;
        unsigned int nentries_mask = dest_ring->nentries_mask;
        unsigned int write_index = dest_ring->write_index;
        unsigned int sw_index = dest_ring->sw_index;

        lockdep_assert_held(&ce->ce_lock);

        return CE_RING_DELTA(nentries_mask, write_index, sw_index - 1);
}

static int __ath10k_ce_rx_post_buf(struct ath10k_ce_pipe *pipe, void *ctx,
                                   dma_addr_t paddr)
{
        struct ath10k *ar = pipe->ar;
        struct ath10k_ce *ce = ath10k_ce_priv(ar);
        struct ath10k_ce_ring *dest_ring = pipe->dest_ring;
        unsigned int nentries_mask = dest_ring->nentries_mask;
        unsigned int write_index = dest_ring->write_index;
        unsigned int sw_index = dest_ring->sw_index;
        struct ce_desc *base = dest_ring->base_addr_owner_space;
        struct ce_desc *desc = CE_DEST_RING_TO_DESC(base, write_index);
        u32 ctrl_addr = pipe->ctrl_addr;

        lockdep_assert_held(&ce->ce_lock);

        if ((pipe->id != 5) &&
            CE_RING_DELTA(nentries_mask, write_index, sw_index - 1) == 0)
                return -ENOSPC;

        desc->addr = __cpu_to_le32(paddr);
        desc->nbytes = 0;

        dest_ring->per_transfer_context[write_index] = ctx;
        write_index = CE_RING_IDX_INCR(nentries_mask, write_index);
        ath10k_ce_dest_ring_write_index_set(ar, ctrl_addr, write_index);
        dest_ring->write_index = write_index;

        return 0;
}

static int __ath10k_ce_rx_post_buf_64(struct ath10k_ce_pipe *pipe,
                                      void *ctx,
                                      dma_addr_t paddr)
{
        struct ath10k *ar = pipe->ar;
        struct ath10k_ce *ce = ath10k_ce_priv(ar);
        struct ath10k_ce_ring *dest_ring = pipe->dest_ring;
        unsigned int nentries_mask = dest_ring->nentries_mask;
        unsigned int write_index = dest_ring->write_index;
        unsigned int sw_index = dest_ring->sw_index;
        struct ce_desc_64 *base = dest_ring->base_addr_owner_space;
        struct ce_desc_64 *desc =
                        CE_DEST_RING_TO_DESC_64(base, write_index);
        u32 ctrl_addr = pipe->ctrl_addr;

        lockdep_assert_held(&ce->ce_lock);

        if (CE_RING_DELTA(nentries_mask, write_index, sw_index - 1) == 0)
                return -ENOSPC;

        desc->addr = __cpu_to_le64(paddr);
        desc->addr &= __cpu_to_le64(CE_DESC_37BIT_ADDR_MASK);

        desc->nbytes = 0;

        dest_ring->per_transfer_context[write_index] = ctx;
        write_index = CE_RING_IDX_INCR(nentries_mask, write_index);
        ath10k_ce_dest_ring_write_index_set(ar, ctrl_addr, write_index);
        dest_ring->write_index = write_index;

        return 0;
}

void ath10k_ce_rx_update_write_idx(struct ath10k_ce_pipe *pipe, u32 nentries)
{
        struct ath10k *ar = pipe->ar;
        struct ath10k_ce_ring *dest_ring = pipe->dest_ring;
        unsigned int nentries_mask = dest_ring->nentries_mask;
        unsigned int write_index = dest_ring->write_index;
        u32 ctrl_addr = pipe->ctrl_addr;
        u32 cur_write_idx = ath10k_ce_dest_ring_write_index_get(ar, ctrl_addr);

        /* Prevent CE ring stuck issue that will occur when ring is full.
         * Make sure that write index is 1 less than read index.
         */
        if ((cur_write_idx + nentries)  == dest_ring->sw_index)
                nentries -= 1;

        write_index = CE_RING_IDX_ADD(nentries_mask, write_index, nentries);
        ath10k_ce_dest_ring_write_index_set(ar, ctrl_addr, write_index);
        dest_ring->write_index = write_index;
}

int ath10k_ce_rx_post_buf(struct ath10k_ce_pipe *pipe, void *ctx,
                          dma_addr_t paddr)
{
        struct ath10k *ar = pipe->ar;
        struct ath10k_ce *ce = ath10k_ce_priv(ar);
        int ret;

        spin_lock_bh(&ce->ce_lock);
        ret = pipe->ops->ce_rx_post_buf(pipe, ctx, paddr);
        spin_unlock_bh(&ce->ce_lock);

        return ret;
}

/*
 * Guts of ath10k_ce_completed_recv_next.
 * The caller takes responsibility for any necessary locking.
 */
static int
         _ath10k_ce_completed_recv_next_nolock(struct ath10k_ce_pipe *ce_state,
                                               void **per_transfer_contextp,
                                               unsigned int *nbytesp)
{
        struct ath10k_ce_ring *dest_ring = ce_state->dest_ring;
        unsigned int nentries_mask = dest_ring->nentries_mask;
        unsigned int sw_index = dest_ring->sw_index;

        struct ce_desc *base = dest_ring->base_addr_owner_space;
        struct ce_desc *desc = CE_DEST_RING_TO_DESC(base, sw_index);
        struct ce_desc sdesc;
        u16 nbytes;

        /* Copy in one go for performance reasons */
        sdesc = *desc;

        nbytes = __le16_to_cpu(sdesc.nbytes);
        if (nbytes == 0) {
                /*
                 * This closes a relatively unusual race where the Host
                 * sees the updated DRRI before the update to the
                 * corresponding descriptor has completed. We treat this
                 * as a descriptor that is not yet done.
                 */
                return -EIO;
        }

        desc->nbytes = 0;

        /* Return data from completed destination descriptor */
        *nbytesp = nbytes;

        if (per_transfer_contextp)
                *per_transfer_contextp =
                        dest_ring->per_transfer_context[sw_index];

        /* Copy engine 5 (HTT Rx) will reuse the same transfer context.
         * So update transfer context all CEs except CE5.
         */
        if (ce_state->id != 5)
                dest_ring->per_transfer_context[sw_index] = NULL;

        /* Update sw_index */
        sw_index = CE_RING_IDX_INCR(nentries_mask, sw_index);
        dest_ring->sw_index = sw_index;

        return 0;
}

static int
_ath10k_ce_completed_recv_next_nolock_64(struct ath10k_ce_pipe *ce_state,
                                         void **per_transfer_contextp,
                                         unsigned int *nbytesp)
{
        struct ath10k_ce_ring *dest_ring = ce_state->dest_ring;
        unsigned int nentries_mask = dest_ring->nentries_mask;
        unsigned int sw_index = dest_ring->sw_index;
        struct ce_desc_64 *base = dest_ring->base_addr_owner_space;
        struct ce_desc_64 *desc =
                CE_DEST_RING_TO_DESC_64(base, sw_index);
        struct ce_desc_64 sdesc;
        u16 nbytes;

        /* Copy in one go for performance reasons */
        sdesc = *desc;

        nbytes = __le16_to_cpu(sdesc.nbytes);
        if (nbytes == 0) {
                /* This closes a relatively unusual race where the Host
                 * sees the updated DRRI before the update to the
                 * corresponding descriptor has completed. We treat this
                 * as a descriptor that is not yet done.
                 */
                return -EIO;
        }

        desc->nbytes = 0;

        /* Return data from completed destination descriptor */
        *nbytesp = nbytes;

        if (per_transfer_contextp)
                *per_transfer_contextp =
                        dest_ring->per_transfer_context[sw_index];

        /* Copy engine 5 (HTT Rx) will reuse the same transfer context.
         * So update transfer context all CEs except CE5.
         */
        if (ce_state->id != 5)
                dest_ring->per_transfer_context[sw_index] = NULL;

        /* Update sw_index */
        sw_index = CE_RING_IDX_INCR(nentries_mask, sw_index);
        dest_ring->sw_index = sw_index;

        return 0;
}

int ath10k_ce_completed_recv_next_nolock(struct ath10k_ce_pipe *ce_state,
                                         void **per_transfer_ctx,
                                         unsigned int *nbytesp)
{
        return ce_state->ops->ce_completed_recv_next_nolock(ce_state,
                                                            per_transfer_ctx,
                                                            nbytesp);
}

int ath10k_ce_completed_recv_next(struct ath10k_ce_pipe *ce_state,
                                  void **per_transfer_contextp,
                                  unsigned int *nbytesp)
{
        struct ath10k *ar = ce_state->ar;
        struct ath10k_ce *ce = ath10k_ce_priv(ar);
        int ret;

        spin_lock_bh(&ce->ce_lock);
        ret = ce_state->ops->ce_completed_recv_next_nolock(ce_state,
                                                   per_transfer_contextp,
                                                   nbytesp);

        spin_unlock_bh(&ce->ce_lock);

        return ret;
}

static int _ath10k_ce_revoke_recv_next(struct ath10k_ce_pipe *ce_state,
                                       void **per_transfer_contextp,
                                       dma_addr_t *bufferp)
{
        struct ath10k_ce_ring *dest_ring;
        unsigned int nentries_mask;
        unsigned int sw_index;
        unsigned int write_index;
        int ret;
        struct ath10k *ar;
        struct ath10k_ce *ce;

        dest_ring = ce_state->dest_ring;

        if (!dest_ring)
                return -EIO;

        ar = ce_state->ar;
        ce = ath10k_ce_priv(ar);

        spin_lock_bh(&ce->ce_lock);

        nentries_mask = dest_ring->nentries_mask;
        sw_index = dest_ring->sw_index;
        write_index = dest_ring->write_index;
        if (write_index != sw_index) {
                struct ce_desc *base = dest_ring->base_addr_owner_space;
                struct ce_desc *desc = CE_DEST_RING_TO_DESC(base, sw_index);

                /* Return data from completed destination descriptor */
                *bufferp = __le32_to_cpu(desc->addr);

                if (per_transfer_contextp)
                        *per_transfer_contextp =
                                dest_ring->per_transfer_context[sw_index];

                /* sanity */
                dest_ring->per_transfer_context[sw_index] = NULL;
                desc->nbytes = 0;

                /* Update sw_index */
                sw_index = CE_RING_IDX_INCR(nentries_mask, sw_index);
                dest_ring->sw_index = sw_index;
                ret = 0;
        } else {
                ret = -EIO;
        }

        spin_unlock_bh(&ce->ce_lock);

        return ret;
}

static int _ath10k_ce_revoke_recv_next_64(struct ath10k_ce_pipe *ce_state,
                                          void **per_transfer_contextp,
                                          dma_addr_t *bufferp)
{
        struct ath10k_ce_ring *dest_ring;
        unsigned int nentries_mask;
        unsigned int sw_index;
        unsigned int write_index;
        int ret;
        struct ath10k *ar;
        struct ath10k_ce *ce;

        dest_ring = ce_state->dest_ring;

        if (!dest_ring)
                return -EIO;

        ar = ce_state->ar;
        ce = ath10k_ce_priv(ar);

        spin_lock_bh(&ce->ce_lock);

        nentries_mask = dest_ring->nentries_mask;
        sw_index = dest_ring->sw_index;
        write_index = dest_ring->write_index;
        if (write_index != sw_index) {
                struct ce_desc_64 *base = dest_ring->base_addr_owner_space;
                struct ce_desc_64 *desc =
                        CE_DEST_RING_TO_DESC_64(base, sw_index);

                /* Return data from completed destination descriptor */
                *bufferp = __le64_to_cpu(desc->addr);

                if (per_transfer_contextp)
                        *per_transfer_contextp =
                                dest_ring->per_transfer_context[sw_index];

                /* sanity */
                dest_ring->per_transfer_context[sw_index] = NULL;
                desc->nbytes = 0;

                /* Update sw_index */
                sw_index = CE_RING_IDX_INCR(nentries_mask, sw_index);
                dest_ring->sw_index = sw_index;
                ret = 0;
        } else {
                ret = -EIO;
        }

        spin_unlock_bh(&ce->ce_lock);

        return ret;
}

int ath10k_ce_revoke_recv_next(struct ath10k_ce_pipe *ce_state,
                               void **per_transfer_contextp,
                               dma_addr_t *bufferp)
{
        return ce_state->ops->ce_revoke_recv_next(ce_state,
                                                  per_transfer_contextp,
                                                  bufferp);
}

/*
 * Guts of ath10k_ce_completed_send_next.
 * The caller takes responsibility for any necessary locking.
 */
int ath10k_ce_completed_send_next_nolock(struct ath10k_ce_pipe *ce_state,
                                         void **per_transfer_contextp)
{
        struct ath10k_ce_ring *src_ring = ce_state->src_ring;
        u32 ctrl_addr = ce_state->ctrl_addr;
        struct ath10k *ar = ce_state->ar;
        unsigned int nentries_mask = src_ring->nentries_mask;
        unsigned int sw_index = src_ring->sw_index;
        unsigned int read_index;
        struct ce_desc *desc;

        if (src_ring->hw_index == sw_index) {
                /*
                 * The SW completion index has caught up with the cached
                 * version of the HW completion index.
                 * Update the cached HW completion index to see whether
                 * the SW has really caught up to the HW, or if the cached
                 * value of the HW index has become stale.
                 */

                read_index = ath10k_ce_src_ring_read_index_get(ar, ctrl_addr);
                if (read_index == 0xffffffff)
                        return -ENODEV;

                read_index &= nentries_mask;
                src_ring->hw_index = read_index;
        }

        read_index = src_ring->hw_index;

        if (read_index == sw_index)
                return -EIO;

        if (per_transfer_contextp)
                *per_transfer_contextp =
                        src_ring->per_transfer_context[sw_index];

        /* sanity */
        src_ring->per_transfer_context[sw_index] = NULL;
        desc = CE_SRC_RING_TO_DESC(src_ring->base_addr_owner_space,
                                   sw_index);
        desc->nbytes = 0;

        /* Update sw_index */
        sw_index = CE_RING_IDX_INCR(nentries_mask, sw_index);
        src_ring->sw_index = sw_index;

        return 0;
}

static void ath10k_ce_extract_desc_data(struct ath10k *ar,
                                        struct ath10k_ce_ring *src_ring,
                                        u32 sw_index,
                                        dma_addr_t *bufferp,
                                        u32 *nbytesp,
                                        u32 *transfer_idp)
{
                struct ce_desc *base = src_ring->base_addr_owner_space;
                struct ce_desc *desc = CE_SRC_RING_TO_DESC(base, sw_index);

                /* Return data from completed source descriptor */
                *bufferp = __le32_to_cpu(desc->addr);
                *nbytesp = __le16_to_cpu(desc->nbytes);
                *transfer_idp = MS(__le16_to_cpu(desc->flags),
                                   CE_DESC_FLAGS_META_DATA);
}

static void ath10k_ce_extract_desc_data_64(struct ath10k *ar,
                                           struct ath10k_ce_ring *src_ring,
                                           u32 sw_index,
                                           dma_addr_t *bufferp,
                                           u32 *nbytesp,
                                           u32 *transfer_idp)
{
                struct ce_desc_64 *base = src_ring->base_addr_owner_space;
                struct ce_desc_64 *desc =
                        CE_SRC_RING_TO_DESC_64(base, sw_index);

                /* Return data from completed source descriptor */
                *bufferp = __le64_to_cpu(desc->addr);
                *nbytesp = __le16_to_cpu(desc->nbytes);
                *transfer_idp = MS(__le16_to_cpu(desc->flags),
                                   CE_DESC_FLAGS_META_DATA);
}

/* NB: Modeled after ath10k_ce_completed_send_next */
int ath10k_ce_cancel_send_next(struct ath10k_ce_pipe *ce_state,
                               void **per_transfer_contextp,
                               dma_addr_t *bufferp,
                               unsigned int *nbytesp,
                               unsigned int *transfer_idp)
{
        struct ath10k_ce_ring *src_ring;
        unsigned int nentries_mask;
        unsigned int sw_index;
        unsigned int write_index;
        int ret;
        struct ath10k *ar;
        struct ath10k_ce *ce;

        src_ring = ce_state->src_ring;

        if (!src_ring)
                return -EIO;

        ar = ce_state->ar;
        ce = ath10k_ce_priv(ar);

        spin_lock_bh(&ce->ce_lock);

        nentries_mask = src_ring->nentries_mask;

        sw_index = src_ring->sw_index;
        write_index = src_ring->write_index;

        if (write_index != sw_index) {
                ce_state->ops->ce_extract_desc_data(ar, src_ring, sw_index,
                                                    bufferp, nbytesp,
                                                    transfer_idp);

                if (per_transfer_contextp)
                        *per_transfer_contextp =
                                src_ring->per_transfer_context[sw_index];

                /* sanity */
                src_ring->per_transfer_context[sw_index] = NULL;

                /* Update sw_index */
                sw_index = CE_RING_IDX_INCR(nentries_mask, sw_index);
                src_ring->sw_index = sw_index;
                ret = 0;
        } else {
                ret = -EIO;
        }

        spin_unlock_bh(&ce->ce_lock);

        return ret;
}

int ath10k_ce_completed_send_next(struct ath10k_ce_pipe *ce_state,
                                  void **per_transfer_contextp)
{
        struct ath10k *ar = ce_state->ar;
        struct ath10k_ce *ce = ath10k_ce_priv(ar);
        int ret;

        spin_lock_bh(&ce->ce_lock);
        ret = ath10k_ce_completed_send_next_nolock(ce_state,
                                                   per_transfer_contextp);
        spin_unlock_bh(&ce->ce_lock);

        return ret;
}

/*
 * Guts of interrupt handler for per-engine interrupts on a particular CE.
 *
 * Invokes registered callbacks for recv_complete,
 * send_complete, and watermarks.
 */
void ath10k_ce_per_engine_service(struct ath10k *ar, unsigned int ce_id)
{
        struct ath10k_ce *ce = ath10k_ce_priv(ar);
        struct ath10k_ce_pipe *ce_state = &ce->ce_states[ce_id];
        struct ath10k_hw_ce_host_wm_regs *wm_regs = ar->hw_ce_regs->wm_regs;
        u32 ctrl_addr = ce_state->ctrl_addr;

        spin_lock_bh(&ce->ce_lock);

        /* Clear the copy-complete interrupts that will be handled here. */
        ath10k_ce_engine_int_status_clear(ar, ctrl_addr,
                                          wm_regs->cc_mask);

        spin_unlock_bh(&ce->ce_lock);

        if (ce_state->recv_cb)
                ce_state->recv_cb(ce_state);

        if (ce_state->send_cb)
                ce_state->send_cb(ce_state);

        spin_lock_bh(&ce->ce_lock);

        /*
         * Misc CE interrupts are not being handled, but still need
         * to be cleared.
         */
        ath10k_ce_engine_int_status_clear(ar, ctrl_addr, wm_regs->wm_mask);

        spin_unlock_bh(&ce->ce_lock);
}

/*
 * Handler for per-engine interrupts on ALL active CEs.
 * This is used in cases where the system is sharing a
 * single interrput for all CEs
 */

void ath10k_ce_per_engine_service_any(struct ath10k *ar)
{
        int ce_id;
        u32 intr_summary;

        intr_summary = ath10k_ce_interrupt_summary(ar);

        for (ce_id = 0; intr_summary && (ce_id < CE_COUNT); ce_id++) {
                if (intr_summary & (1 << ce_id))
                        intr_summary &= ~(1 << ce_id);
                else
                        /* no intr pending on this CE */
                        continue;

                ath10k_ce_per_engine_service(ar, ce_id);
        }
}

/*
 * Adjust interrupts for the copy complete handler.
 * If it's needed for either send or recv, then unmask
 * this interrupt; otherwise, mask it.
 *
 * Called with ce_lock held.
 */
static void ath10k_ce_per_engine_handler_adjust(struct ath10k_ce_pipe *ce_state)
{
        u32 ctrl_addr = ce_state->ctrl_addr;
        struct ath10k *ar = ce_state->ar;
        bool disable_copy_compl_intr = ce_state->attr_flags & CE_ATTR_DIS_INTR;

        if ((!disable_copy_compl_intr) &&
            (ce_state->send_cb || ce_state->recv_cb))
                ath10k_ce_copy_complete_inter_enable(ar, ctrl_addr);
        else
                ath10k_ce_copy_complete_intr_disable(ar, ctrl_addr);

        ath10k_ce_watermark_intr_disable(ar, ctrl_addr);
}

int ath10k_ce_disable_interrupts(struct ath10k *ar)
{
        int ce_id;

        for (ce_id = 0; ce_id < CE_COUNT; ce_id++) {
                u32 ctrl_addr = ath10k_ce_base_address(ar, ce_id);

                ath10k_ce_copy_complete_intr_disable(ar, ctrl_addr);
                ath10k_ce_error_intr_disable(ar, ctrl_addr);
                ath10k_ce_watermark_intr_disable(ar, ctrl_addr);
        }

        return 0;
}

void ath10k_ce_enable_interrupts(struct ath10k *ar)
{
        struct ath10k_ce *ce = ath10k_ce_priv(ar);
        int ce_id;
        struct ath10k_ce_pipe *ce_state;

        /* Skip the last copy engine, CE7 the diagnostic window, as that
         * uses polling and isn't initialized for interrupts.
         */
        for (ce_id = 0; ce_id < CE_COUNT - 1; ce_id++) {
                ce_state  = &ce->ce_states[ce_id];
                ath10k_ce_per_engine_handler_adjust(ce_state);
        }
}

static int ath10k_ce_init_src_ring(struct ath10k *ar,
                                   unsigned int ce_id,
                                   const struct ce_attr *attr)
{
        struct ath10k_ce *ce = ath10k_ce_priv(ar);
        struct ath10k_ce_pipe *ce_state = &ce->ce_states[ce_id];
        struct ath10k_ce_ring *src_ring = ce_state->src_ring;
        u32 nentries, ctrl_addr = ath10k_ce_base_address(ar, ce_id);

        nentries = roundup_pow_of_two(attr->src_nentries);

        if (ar->hw_params.target_64bit)
                memset(src_ring->base_addr_owner_space, 0,
                       nentries * sizeof(struct ce_desc_64));
        else
                memset(src_ring->base_addr_owner_space, 0,
                       nentries * sizeof(struct ce_desc));

        src_ring->sw_index = ath10k_ce_src_ring_read_index_get(ar, ctrl_addr);
        src_ring->sw_index &= src_ring->nentries_mask;
        src_ring->hw_index = src_ring->sw_index;

        src_ring->write_index =
                ath10k_ce_src_ring_write_index_get(ar, ctrl_addr);
        src_ring->write_index &= src_ring->nentries_mask;

        ath10k_ce_src_ring_base_addr_set(ar, ctrl_addr,
                                         src_ring->base_addr_ce_space);
        ath10k_ce_src_ring_size_set(ar, ctrl_addr, nentries);
        ath10k_ce_src_ring_dmax_set(ar, ctrl_addr, attr->src_sz_max);
        ath10k_ce_src_ring_byte_swap_set(ar, ctrl_addr, 0);
        ath10k_ce_src_ring_lowmark_set(ar, ctrl_addr, 0);
        ath10k_ce_src_ring_highmark_set(ar, ctrl_addr, nentries);

        ath10k_dbg(ar, ATH10K_DBG_BOOT,
                   "boot init ce src ring id %d entries %d base_addr %pK\n",
                   ce_id, nentries, src_ring->base_addr_owner_space);

        return 0;
}

static int ath10k_ce_init_dest_ring(struct ath10k *ar,
                                    unsigned int ce_id,
                                    const struct ce_attr *attr)
{
        struct ath10k_ce *ce = ath10k_ce_priv(ar);
        struct ath10k_ce_pipe *ce_state = &ce->ce_states[ce_id];
        struct ath10k_ce_ring *dest_ring = ce_state->dest_ring;
        u32 nentries, ctrl_addr = ath10k_ce_base_address(ar, ce_id);

        nentries = roundup_pow_of_two(attr->dest_nentries);

        if (ar->hw_params.target_64bit)
                memset(dest_ring->base_addr_owner_space, 0,
                       nentries * sizeof(struct ce_desc_64));
        else
                memset(dest_ring->base_addr_owner_space, 0,
                       nentries * sizeof(struct ce_desc));

        dest_ring->sw_index = ath10k_ce_dest_ring_read_index_get(ar, ctrl_addr);
        dest_ring->sw_index &= dest_ring->nentries_mask;
        dest_ring->write_index =
                ath10k_ce_dest_ring_write_index_get(ar, ctrl_addr);
        dest_ring->write_index &= dest_ring->nentries_mask;

        ath10k_ce_dest_ring_base_addr_set(ar, ctrl_addr,
                                          dest_ring->base_addr_ce_space);
        ath10k_ce_dest_ring_size_set(ar, ctrl_addr, nentries);
        ath10k_ce_dest_ring_byte_swap_set(ar, ctrl_addr, 0);
        ath10k_ce_dest_ring_lowmark_set(ar, ctrl_addr, 0);
        ath10k_ce_dest_ring_highmark_set(ar, ctrl_addr, nentries);

        ath10k_dbg(ar, ATH10K_DBG_BOOT,
                   "boot ce dest ring id %d entries %d base_addr %pK\n",
                   ce_id, nentries, dest_ring->base_addr_owner_space);

        return 0;
}

static struct ath10k_ce_ring *
ath10k_ce_alloc_src_ring(struct ath10k *ar, unsigned int ce_id,
                         const struct ce_attr *attr)
{
        struct ath10k_ce_ring *src_ring;
        u32 nentries = attr->src_nentries;
        dma_addr_t base_addr;

        nentries = roundup_pow_of_two(nentries);

        src_ring = kzalloc(sizeof(*src_ring) +
                           (nentries *
                            sizeof(*src_ring->per_transfer_context)),
                           GFP_KERNEL);
        if (src_ring == NULL)
                return ERR_PTR(-ENOMEM);

        src_ring->nentries = nentries;
        src_ring->nentries_mask = nentries - 1;

        /*
         * Legacy platforms that do not support cache
         * coherent DMA are unsupported
         */
        src_ring->base_addr_owner_space_unaligned =
                dma_alloc_coherent(ar->dev,
                                   (nentries * sizeof(struct ce_desc) +
                                    CE_DESC_RING_ALIGN),
                                   &base_addr, GFP_KERNEL);
        if (!src_ring->base_addr_owner_space_unaligned) {
                kfree(src_ring);
                return ERR_PTR(-ENOMEM);
        }

        src_ring->base_addr_ce_space_unaligned = base_addr;

        src_ring->base_addr_owner_space =
                        PTR_ALIGN(src_ring->base_addr_owner_space_unaligned,
                                  CE_DESC_RING_ALIGN);
        src_ring->base_addr_ce_space =
                        ALIGN(src_ring->base_addr_ce_space_unaligned,
                              CE_DESC_RING_ALIGN);

        return src_ring;
}

static struct ath10k_ce_ring *
ath10k_ce_alloc_src_ring_64(struct ath10k *ar, unsigned int ce_id,
                            const struct ce_attr *attr)
{
        struct ath10k_ce_ring *src_ring;
        u32 nentries = attr->src_nentries;
        dma_addr_t base_addr;

        nentries = roundup_pow_of_two(nentries);

        src_ring = kzalloc(sizeof(*src_ring) +
                           (nentries *
                            sizeof(*src_ring->per_transfer_context)),
                           GFP_KERNEL);
        if (!src_ring)
                return ERR_PTR(-ENOMEM);

        src_ring->nentries = nentries;
        src_ring->nentries_mask = nentries - 1;

        /* Legacy platforms that do not support cache
         * coherent DMA are unsupported
         */
        src_ring->base_addr_owner_space_unaligned =
                dma_alloc_coherent(ar->dev,
                                   (nentries * sizeof(struct ce_desc_64) +
                                    CE_DESC_RING_ALIGN),
                                   &base_addr, GFP_KERNEL);
        if (!src_ring->base_addr_owner_space_unaligned) {
                kfree(src_ring);
                return ERR_PTR(-ENOMEM);
        }

        src_ring->base_addr_ce_space_unaligned = base_addr;

        src_ring->base_addr_owner_space =
                        PTR_ALIGN(src_ring->base_addr_owner_space_unaligned,
                                  CE_DESC_RING_ALIGN);
        src_ring->base_addr_ce_space =
                        ALIGN(src_ring->base_addr_ce_space_unaligned,
                              CE_DESC_RING_ALIGN);

        return src_ring;
}

static struct ath10k_ce_ring *
ath10k_ce_alloc_dest_ring(struct ath10k *ar, unsigned int ce_id,
                          const struct ce_attr *attr)
{
        struct ath10k_ce_ring *dest_ring;
        u32 nentries;
        dma_addr_t base_addr;

        nentries = roundup_pow_of_two(attr->dest_nentries);

        dest_ring = kzalloc(sizeof(*dest_ring) +
                            (nentries *
                             sizeof(*dest_ring->per_transfer_context)),
                            GFP_KERNEL);
        if (dest_ring == NULL)
                return ERR_PTR(-ENOMEM);

        dest_ring->nentries = nentries;
        dest_ring->nentries_mask = nentries - 1;

        /*
         * Legacy platforms that do not support cache
         * coherent DMA are unsupported
         */
        dest_ring->base_addr_owner_space_unaligned =
                dma_zalloc_coherent(ar->dev,
                                    (nentries * sizeof(struct ce_desc) +
                                     CE_DESC_RING_ALIGN),
                                    &base_addr, GFP_KERNEL);
        if (!dest_ring->base_addr_owner_space_unaligned) {
                kfree(dest_ring);
                return ERR_PTR(-ENOMEM);
        }

        dest_ring->base_addr_ce_space_unaligned = base_addr;

        dest_ring->base_addr_owner_space =
                        PTR_ALIGN(dest_ring->base_addr_owner_space_unaligned,
                                  CE_DESC_RING_ALIGN);
        dest_ring->base_addr_ce_space =
                                ALIGN(dest_ring->base_addr_ce_space_unaligned,
                                      CE_DESC_RING_ALIGN);

        return dest_ring;
}

static struct ath10k_ce_ring *
ath10k_ce_alloc_dest_ring_64(struct ath10k *ar, unsigned int ce_id,
                             const struct ce_attr *attr)
{
        struct ath10k_ce_ring *dest_ring;
        u32 nentries;
        dma_addr_t base_addr;

        nentries = roundup_pow_of_two(attr->dest_nentries);

        dest_ring = kzalloc(sizeof(*dest_ring) +
                            (nentries *
                             sizeof(*dest_ring->per_transfer_context)),
                            GFP_KERNEL);
        if (!dest_ring)
                return ERR_PTR(-ENOMEM);

        dest_ring->nentries = nentries;
        dest_ring->nentries_mask = nentries - 1;

        /* Legacy platforms that do not support cache
         * coherent DMA are unsupported
         */
        dest_ring->base_addr_owner_space_unaligned =
                dma_alloc_coherent(ar->dev,
                                   (nentries * sizeof(struct ce_desc_64) +
                                    CE_DESC_RING_ALIGN),
                                   &base_addr, GFP_KERNEL);
        if (!dest_ring->base_addr_owner_space_unaligned) {
                kfree(dest_ring);
                return ERR_PTR(-ENOMEM);
        }

        dest_ring->base_addr_ce_space_unaligned = base_addr;

        /* Correctly initialize memory to 0 to prevent garbage
         * data crashing system when download firmware
         */
        memset(dest_ring->base_addr_owner_space_unaligned, 0,
               nentries * sizeof(struct ce_desc_64) + CE_DESC_RING_ALIGN);

        dest_ring->base_addr_owner_space =
                        PTR_ALIGN(dest_ring->base_addr_owner_space_unaligned,
                                  CE_DESC_RING_ALIGN);
        dest_ring->base_addr_ce_space =
                        ALIGN(dest_ring->base_addr_ce_space_unaligned,
                              CE_DESC_RING_ALIGN);

        return dest_ring;
}

/*
 * Initialize a Copy Engine based on caller-supplied attributes.
 * This may be called once to initialize both source and destination
 * rings or it may be called twice for separate source and destination
 * initialization. It may be that only one side or the other is
 * initialized by software/firmware.
 */
int ath10k_ce_init_pipe(struct ath10k *ar, unsigned int ce_id,
                        const struct ce_attr *attr)
{
        int ret;

        if (attr->src_nentries) {
                ret = ath10k_ce_init_src_ring(ar, ce_id, attr);
                if (ret) {
                        ath10k_err(ar, "Failed to initialize CE src ring for ID: %d (%d)\n",
                                   ce_id, ret);
                        return ret;
                }
        }

        if (attr->dest_nentries) {
                ret = ath10k_ce_init_dest_ring(ar, ce_id, attr);
                if (ret) {
                        ath10k_err(ar, "Failed to initialize CE dest ring for ID: %d (%d)\n",
                                   ce_id, ret);
                        return ret;
                }
        }

        return 0;
}

static void ath10k_ce_deinit_src_ring(struct ath10k *ar, unsigned int ce_id)
{
        u32 ctrl_addr = ath10k_ce_base_address(ar, ce_id);

        ath10k_ce_src_ring_base_addr_set(ar, ctrl_addr, 0);
        ath10k_ce_src_ring_size_set(ar, ctrl_addr, 0);
        ath10k_ce_src_ring_dmax_set(ar, ctrl_addr, 0);
        ath10k_ce_src_ring_highmark_set(ar, ctrl_addr, 0);
}

static void ath10k_ce_deinit_dest_ring(struct ath10k *ar, unsigned int ce_id)
{
        u32 ctrl_addr = ath10k_ce_base_address(ar, ce_id);

        ath10k_ce_dest_ring_base_addr_set(ar, ctrl_addr, 0);
        ath10k_ce_dest_ring_size_set(ar, ctrl_addr, 0);
        ath10k_ce_dest_ring_highmark_set(ar, ctrl_addr, 0);
}

void ath10k_ce_deinit_pipe(struct ath10k *ar, unsigned int ce_id)
{
        ath10k_ce_deinit_src_ring(ar, ce_id);
        ath10k_ce_deinit_dest_ring(ar, ce_id);
}

static void _ath10k_ce_free_pipe(struct ath10k *ar, int ce_id)
{
        struct ath10k_ce *ce = ath10k_ce_priv(ar);
        struct ath10k_ce_pipe *ce_state = &ce->ce_states[ce_id];

        if (ce_state->src_ring) {
                dma_free_coherent(ar->dev,
                                  (ce_state->src_ring->nentries *
                                   sizeof(struct ce_desc) +
                                   CE_DESC_RING_ALIGN),
                                  ce_state->src_ring->base_addr_owner_space,
                                  ce_state->src_ring->base_addr_ce_space);
                kfree(ce_state->src_ring);
        }

        if (ce_state->dest_ring) {
                dma_free_coherent(ar->dev,
                                  (ce_state->dest_ring->nentries *
                                   sizeof(struct ce_desc) +
                                   CE_DESC_RING_ALIGN),
                                  ce_state->dest_ring->base_addr_owner_space,
                                  ce_state->dest_ring->base_addr_ce_space);
                kfree(ce_state->dest_ring);
        }

        ce_state->src_ring = NULL;
        ce_state->dest_ring = NULL;
}

static void _ath10k_ce_free_pipe_64(struct ath10k *ar, int ce_id)
{
        struct ath10k_ce *ce = ath10k_ce_priv(ar);
        struct ath10k_ce_pipe *ce_state = &ce->ce_states[ce_id];

        if (ce_state->src_ring) {
                dma_free_coherent(ar->dev,
                                  (ce_state->src_ring->nentries *
                                   sizeof(struct ce_desc_64) +
                                   CE_DESC_RING_ALIGN),
                                  ce_state->src_ring->base_addr_owner_space,
                                  ce_state->src_ring->base_addr_ce_space);
                kfree(ce_state->src_ring);
        }

        if (ce_state->dest_ring) {
                dma_free_coherent(ar->dev,
                                  (ce_state->dest_ring->nentries *
                                   sizeof(struct ce_desc_64) +
                                   CE_DESC_RING_ALIGN),
                                  ce_state->dest_ring->base_addr_owner_space,
                                  ce_state->dest_ring->base_addr_ce_space);
                kfree(ce_state->dest_ring);
        }

        ce_state->src_ring = NULL;
        ce_state->dest_ring = NULL;
}

void ath10k_ce_free_pipe(struct ath10k *ar, int ce_id)
{
        struct ath10k_ce *ce = ath10k_ce_priv(ar);
        struct ath10k_ce_pipe *ce_state = &ce->ce_states[ce_id];

        ce_state->ops->ce_free_pipe(ar, ce_id);
}

void ath10k_ce_dump_registers(struct ath10k *ar,
                              struct ath10k_fw_crash_data *crash_data)
{
        struct ath10k_ce *ce = ath10k_ce_priv(ar);
        struct ath10k_ce_crash_data ce_data;
        u32 addr, id;

        lockdep_assert_held(&ar->data_lock);

        ath10k_err(ar, "Copy Engine register dump:\n");

        spin_lock_bh(&ce->ce_lock);
        for (id = 0; id < CE_COUNT; id++) {
                addr = ath10k_ce_base_address(ar, id);
                ce_data.base_addr = cpu_to_le32(addr);

                ce_data.src_wr_idx =
                        cpu_to_le32(ath10k_ce_src_ring_write_index_get(ar, addr));
                ce_data.src_r_idx =
                        cpu_to_le32(ath10k_ce_src_ring_read_index_get(ar, addr));
                ce_data.dst_wr_idx =
                        cpu_to_le32(ath10k_ce_dest_ring_write_index_get(ar, addr));
                ce_data.dst_r_idx =
                        cpu_to_le32(ath10k_ce_dest_ring_read_index_get(ar, addr));

                if (crash_data)
                        crash_data->ce_crash_data[id] = ce_data;

                ath10k_err(ar, "[%02d]: 0x%08x %3u %3u %3u %3u", id,
                           le32_to_cpu(ce_data.base_addr),
                           le32_to_cpu(ce_data.src_wr_idx),
                           le32_to_cpu(ce_data.src_r_idx),
                           le32_to_cpu(ce_data.dst_wr_idx),
                           le32_to_cpu(ce_data.dst_r_idx));
        }

        spin_unlock_bh(&ce->ce_lock);
}

static const struct ath10k_ce_ops ce_ops = {
        .ce_alloc_src_ring = ath10k_ce_alloc_src_ring,
        .ce_alloc_dst_ring = ath10k_ce_alloc_dest_ring,
        .ce_rx_post_buf = __ath10k_ce_rx_post_buf,
        .ce_completed_recv_next_nolock = _ath10k_ce_completed_recv_next_nolock,
        .ce_revoke_recv_next = _ath10k_ce_revoke_recv_next,
        .ce_extract_desc_data = ath10k_ce_extract_desc_data,
        .ce_free_pipe = _ath10k_ce_free_pipe,
        .ce_send_nolock = _ath10k_ce_send_nolock,
};

static const struct ath10k_ce_ops ce_64_ops = {
        .ce_alloc_src_ring = ath10k_ce_alloc_src_ring_64,
        .ce_alloc_dst_ring = ath10k_ce_alloc_dest_ring_64,
        .ce_rx_post_buf = __ath10k_ce_rx_post_buf_64,
        .ce_completed_recv_next_nolock =
                                _ath10k_ce_completed_recv_next_nolock_64,
        .ce_revoke_recv_next = _ath10k_ce_revoke_recv_next_64,
        .ce_extract_desc_data = ath10k_ce_extract_desc_data_64,
        .ce_free_pipe = _ath10k_ce_free_pipe_64,
        .ce_send_nolock = _ath10k_ce_send_nolock_64,
};

static void ath10k_ce_set_ops(struct ath10k *ar,
                              struct ath10k_ce_pipe *ce_state)
{
        switch (ar->hw_rev) {
        case ATH10K_HW_WCN3990:
                ce_state->ops = &ce_64_ops;
                break;
        default:
                ce_state->ops = &ce_ops;
                break;
        }
}

int ath10k_ce_alloc_pipe(struct ath10k *ar, int ce_id,
                         const struct ce_attr *attr)
{
        struct ath10k_ce *ce = ath10k_ce_priv(ar);
        struct ath10k_ce_pipe *ce_state = &ce->ce_states[ce_id];
        int ret;

        ath10k_ce_set_ops(ar, ce_state);
        /* Make sure there's enough CE ringbuffer entries for HTT TX to avoid
         * additional TX locking checks.
         *
         * For the lack of a better place do the check here.
         */
        BUILD_BUG_ON(2 * TARGET_NUM_MSDU_DESC >
                     (CE_HTT_H2T_MSG_SRC_NENTRIES - 1));
        BUILD_BUG_ON(2 * TARGET_10_4_NUM_MSDU_DESC_PFC >
                     (CE_HTT_H2T_MSG_SRC_NENTRIES - 1));
        BUILD_BUG_ON(2 * TARGET_TLV_NUM_MSDU_DESC >
                     (CE_HTT_H2T_MSG_SRC_NENTRIES - 1));

        ce_state->ar = ar;
        ce_state->id = ce_id;
        ce_state->ctrl_addr = ath10k_ce_base_address(ar, ce_id);
        ce_state->attr_flags = attr->flags;
        ce_state->src_sz_max = attr->src_sz_max;

        if (attr->src_nentries)
                ce_state->send_cb = attr->send_cb;

        if (attr->dest_nentries)
                ce_state->recv_cb = attr->recv_cb;

        if (attr->src_nentries) {
                ce_state->src_ring =
                        ce_state->ops->ce_alloc_src_ring(ar, ce_id, attr);
                if (IS_ERR(ce_state->src_ring)) {
                        ret = PTR_ERR(ce_state->src_ring);
                        ath10k_err(ar, "failed to alloc CE src ring %d: %d\n",
                                   ce_id, ret);
                        ce_state->src_ring = NULL;
                        return ret;
                }
        }

        if (attr->dest_nentries) {
                ce_state->dest_ring = ce_state->ops->ce_alloc_dst_ring(ar,
                                                                        ce_id,
                                                                        attr);
                if (IS_ERR(ce_state->dest_ring)) {
                        ret = PTR_ERR(ce_state->dest_ring);
                        ath10k_err(ar, "failed to alloc CE dest ring %d: %d\n",
                                   ce_id, ret);
                        ce_state->dest_ring = NULL;
                        return ret;
                }
        }

        return 0;
}