/*
 * Copyright (c) 2013-2015 The Linux Foundation. All rights reserved.
 *
 * Previously licensed under the ISC license by 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.
 */

/*
 * This file was originally distributed by Qualcomm Atheros, Inc.
 * under proprietary terms before Copyright ownership was assigned
 * to the Linux Foundation.
 */

#ifndef __COPY_ENGINE_API_H__
#define __COPY_ENGINE_API_H__

#include "ce_main.h"
/* TBDXXX: Use int return values for consistency with Target */

/* TBDXXX: Perhaps merge Host/Target-->common */

/*
 * Copy Engine support: low-level Target-side Copy Engine API.
 * This is a hardware access layer used by code that understands
 * how to use copy engines.
 */

/*
 * A "struct CE_handle *" serves as an opaque pointer-sized
 * handle to a specific copy engine.
 */
struct CE_handle;

/*
 * "Send Completion" callback type for Send Completion Notification.
 *
 * If a Send Completion callback is registered and one or more sends
 * have completed, the callback is invoked.
 *
 * per_ce_send_context is a context supplied by the calling layer
 * (via ce_send_cb_register). It is associated with a copy engine.
 *
 * per_transfer_send_context is context supplied by the calling layer
 * (via the "send" call).  It may be different for each invocation
 * of send.
 *
 * The buffer parameter is the first byte sent of the first buffer
 * sent (if more than one buffer).
 *
 * nbytes is the number of bytes of that buffer that were sent.
 *
 * transfer_id matches the value used when the buffer or
 * buf_list was sent.
 *
 * Implementation note: Pops 1 completed send buffer from Source ring
 */
typedef void (*ce_send_cb)(struct CE_handle *copyeng,
			   void *per_ce_send_context,
			   void *per_transfer_send_context,
			   cdf_dma_addr_t buffer,
			   unsigned int nbytes,
			   unsigned int transfer_id,
			   unsigned int sw_index,
			   unsigned int hw_index,
			   uint32_t toeplitz_hash_result);

/*
 * "Buffer Received" callback type for Buffer Received Notification.
 *
 * Implementation note: Pops 1 completed recv buffer from Dest ring
 */
typedef void (*CE_recv_cb)(struct CE_handle *copyeng,
		   void *per_CE_recv_context,
		   void *per_transfer_recv_context,
		   cdf_dma_addr_t buffer,
		   unsigned int nbytes,
		   unsigned int transfer_id,
		   unsigned int flags);

/*
 * Copy Engine Watermark callback type.
 *
 * Allows upper layers to be notified when watermarks are reached:
 *   space is available and/or running short in a source ring
 *   buffers are exhausted and/or abundant in a destination ring
 *
 * The flags parameter indicates which condition triggered this
 * callback.  See CE_WM_FLAG_*.
 *
 * Watermark APIs are provided to allow upper layers "batch"
 * descriptor processing and to allow upper layers to
 * throttle/unthrottle.
 */
typedef void (*CE_watermark_cb)(struct CE_handle *copyeng,
				void *per_CE_wm_context, unsigned int flags);

#define CE_WM_FLAG_SEND_HIGH   1
#define CE_WM_FLAG_SEND_LOW    2
#define CE_WM_FLAG_RECV_HIGH   4
#define CE_WM_FLAG_RECV_LOW    8

/* A list of buffers to be gathered and sent */
struct ce_sendlist;

/* Copy Engine settable attributes */
struct CE_attr;

/*==================Send=====================================================*/

/* ce_send flags */
/* disable ring's byte swap, even if the default policy is to swap */
#define CE_SEND_FLAG_SWAP_DISABLE        1

/*
 * Queue a source buffer to be sent to an anonymous destination buffer.
 *   copyeng         - which copy engine to use
 *   buffer          - address of buffer
 *   nbytes          - number of bytes to send
 *   transfer_id     - arbitrary ID; reflected to destination
 *   flags           - CE_SEND_FLAG_* values
 * Returns 0 on success; otherwise an error status.
 *
 * Note: If no flags are specified, use CE's default data swap mode.
 *
 * Implementation note: pushes 1 buffer to Source ring
 */
int ce_send(struct CE_handle *copyeng,
		void *per_transfer_send_context,
		cdf_dma_addr_t buffer,
		unsigned int nbytes,
		unsigned int transfer_id,
		unsigned int flags,
		unsigned int user_flags);

#ifdef WLAN_FEATURE_FASTPATH
int ce_send_fast(struct CE_handle *copyeng, cdf_nbuf_t *msdus,
		 unsigned int num_msdus, unsigned int transfer_id);

#endif
void ce_pkt_dl_len_set(void *hif_sc, unsigned int pkt_download_len);

/*
 * Register a Send Callback function.
 * This function is called as soon as the contents of a Send
 * have reached the destination, unless disable_interrupts is
 * requested.  In this case, the callback is invoked when the
 * send status is polled, shortly after the send completes.
 */
void ce_send_cb_register(struct CE_handle *copyeng,
			 ce_send_cb fn_ptr,
			 void *per_ce_send_context, int disable_interrupts);

/*
 * Return the size of a SendList. This allows the caller to allocate
 * a SendList while the SendList structure remains opaque.
 */
unsigned int ce_sendlist_sizeof(void);

/* Initialize a sendlist */
void ce_sendlist_init(struct ce_sendlist *sendlist);

/* Append a simple buffer (address/length) to a sendlist. */
int ce_sendlist_buf_add(struct ce_sendlist *sendlist,
		cdf_dma_addr_t buffer,
		unsigned int nbytes,
		uint32_t flags, /* OR-ed with internal flags */
		uint32_t user_flags);

/*
 * Queue a "sendlist" of buffers to be sent using gather to a single
 * anonymous destination buffer
 *   copyeng         - which copy engine to use
 *   sendlist        - list of simple buffers to send using gather
 *   transfer_id     - arbitrary ID; reflected to destination
 * Returns 0 on success; otherwise an error status.
 *
 * Implemenation note: Pushes multiple buffers with Gather to Source ring.
 */
int ce_sendlist_send(struct CE_handle *copyeng,
		void *per_transfer_send_context,
		struct ce_sendlist *sendlist,
		unsigned int transfer_id);

/*==================Recv=====================================================*/

/*
 * Make a buffer available to receive. The buffer must be at least of a
 * minimal size appropriate for this copy engine (src_sz_max attribute).
 *   copyeng                    - which copy engine to use
 *   per_transfer_recv_context  - context passed back to caller's recv_cb
 *   buffer                     - address of buffer in CE space
 * Returns 0 on success; otherwise an error status.
 *
 * Implemenation note: Pushes a buffer to Dest ring.
 */
int ce_recv_buf_enqueue(struct CE_handle *copyeng,
			void *per_transfer_recv_context,
			cdf_dma_addr_t buffer);

/*
 * Register a Receive Callback function.
 * This function is called as soon as data is received
 * from the source.
 */
void ce_recv_cb_register(struct CE_handle *copyeng,
			 CE_recv_cb fn_ptr,
			 void *per_CE_recv_context,
			 int disable_interrupts);

/*==================CE Watermark=============================================*/

/*
 * Register a Watermark Callback function.
 * This function is called as soon as a watermark level
 * is crossed.  A Watermark Callback function is free to
 * handle received data "en masse"; but then some coordination
 * is required with a registered Receive Callback function.
 * [Suggestion: Either handle Receives in a Receive Callback
 * or en masse in a Watermark Callback; but not both.]
 */
void ce_watermark_cb_register(struct CE_handle *copyeng,
			  CE_watermark_cb fn_ptr,
			  void *per_CE_wm_context);

/*
 * Set low/high watermarks for the send/source side of a copy engine.
 *
 * Typically, the destination side CPU manages watermarks for
 * the receive side and the source side CPU manages watermarks
 * for the send side.
 *
 * A low watermark of 0 is never hit (so the watermark function
 * will never be called for a Low Watermark condition).
 *
 * A high watermark equal to nentries is never hit (so the
 * watermark function will never be called for a High Watermark
 * condition).
 */
void ce_send_watermarks_set(struct CE_handle *copyeng,
			    unsigned int low_alert_nentries,
			    unsigned int high_alert_nentries);

/* Set low/high watermarks for the receive/destination side of copy engine. */
void ce_recv_watermarks_set(struct CE_handle *copyeng,
			    unsigned int low_alert_nentries,
			    unsigned int high_alert_nentries);

/*
 * Return the number of entries that can be queued
 * to a ring at an instant in time.
 *
 * For source ring, does not imply that destination-side
 * buffers are available; merely indicates descriptor space
 * in the source ring.
 *
 * For destination ring, does not imply that previously
 * received buffers have been processed; merely indicates
 * descriptor space in destination ring.
 *
 * Mainly for use with CE Watermark callback.
 */
unsigned int ce_send_entries_avail(struct CE_handle *copyeng);
unsigned int ce_recv_entries_avail(struct CE_handle *copyeng);

/*
 * Return the number of entries in the ring that are ready
 * to be processed by software.
 *
 * For source ring, the number of descriptors that have
 * been completed and can now be overwritten with new send
 * descriptors.
 *
 * For destination ring, the number of descriptors that
 * are available to be processed (newly received buffers).
 */
unsigned int ce_send_entries_done(struct CE_handle *copyeng);
unsigned int ce_recv_entries_done(struct CE_handle *copyeng);

/* recv flags */
/* Data is byte-swapped */
#define CE_RECV_FLAG_SWAPPED            1

void ce_enable_msi(struct ol_softc *scn,
		   unsigned int CE_id,
		   uint32_t msi_addr_lo,
		   uint32_t msi_addr_hi,
		   uint32_t msi_data);
/*
 * Supply data for the next completed unprocessed receive descriptor.
 *
 * For use
 *    with CE Watermark callback,
 *    in a recv_cb function when processing buf_lists
 *    in a recv_cb function in order to mitigate recv_cb's.
 *
 * Implemenation note: Pops buffer from Dest ring.
 */
int ce_completed_recv_next(struct CE_handle *copyeng,
			   void **per_CE_contextp,
			   void **per_transfer_contextp,
			   cdf_dma_addr_t *bufferp,
			   unsigned int *nbytesp,
			   unsigned int *transfer_idp,
			   unsigned int *flagsp);

/*
 * Supply data for the next completed unprocessed send descriptor.
 *
 * For use
 *    with CE Watermark callback
 *    in a send_cb function in order to mitigate send_cb's.
 *
 * Implementation note: Pops 1 completed send buffer from Source ring
 */
int ce_completed_send_next(struct CE_handle *copyeng,
			   void **per_CE_contextp,
			   void **per_transfer_contextp,
			   cdf_dma_addr_t *bufferp,
			   unsigned int *nbytesp,
			   unsigned int *transfer_idp,
			   unsigned int *sw_idx,
			   unsigned int *hw_idx,
			   uint32_t *toeplitz_hash_result);

/*==================CE Engine Initialization=================================*/

/* Initialize an instance of a CE */
struct CE_handle *ce_init(struct ol_softc *scn,
			  unsigned int CE_id, struct CE_attr *attr);

/*==================CE Engine Shutdown=======================================*/
/*
 * Support clean shutdown by allowing the caller to revoke
 * receive buffers.  Target DMA must be stopped before using
 * this API.
 */
CDF_STATUS
ce_revoke_recv_next(struct CE_handle *copyeng,
		    void **per_CE_contextp,
		    void **per_transfer_contextp,
		    cdf_dma_addr_t *bufferp);

/*
 * Support clean shutdown by allowing the caller to cancel
 * pending sends.  Target DMA must be stopped before using
 * this API.
 */
CDF_STATUS
ce_cancel_send_next(struct CE_handle *copyeng,
		    void **per_CE_contextp,
		    void **per_transfer_contextp,
		    cdf_dma_addr_t *bufferp,
		    unsigned int *nbytesp,
		    unsigned int *transfer_idp,
		    uint32_t *toeplitz_hash_result);

void ce_fini(struct CE_handle *copyeng);

/*==================CE Interrupt Handlers====================================*/
void ce_per_engine_service_any(int irq, struct ol_softc *scn);
int ce_per_engine_service(struct ol_softc *scn, unsigned int CE_id);
void ce_per_engine_servicereap(struct ol_softc *scn, unsigned int CE_id);

/*===================CE cmpl interrupt Enable/Disable =======================*/
void ce_disable_any_copy_compl_intr(struct ol_softc *scn);
void ce_enable_any_copy_compl_intr(struct ol_softc *scn);
void ce_disable_any_copy_compl_intr_nolock(struct ol_softc *scn);
void ce_enable_any_copy_compl_intr_nolock(struct ol_softc *scn);

/* API to check if any of the copy engine pipes has
 * pending frames for prcoessing
 */
bool ce_get_rx_pending(struct ol_softc *scn);

/* CE_attr.flags values */
#define CE_ATTR_NO_SNOOP             0x01 /* Use NonSnooping PCIe accesses? */
#define CE_ATTR_BYTE_SWAP_DATA       0x02 /* Byte swap data words */
#define CE_ATTR_SWIZZLE_DESCRIPTORS  0x04 /* Swizzle descriptors? */
#define CE_ATTR_DISABLE_INTR         0x08 /* no interrupt on copy completion */
#define CE_ATTR_ENABLE_POLL          0x10 /* poll for residue descriptors */

/* Attributes of an instance of a Copy Engine */
struct CE_attr {
	unsigned int flags;         /* CE_ATTR_* values */
	unsigned int priority;      /* TBD */
	unsigned int src_nentries;  /* #entries in source ring -
				     * Must be a power of 2 */
	unsigned int src_sz_max;    /* Max source send size for this CE.
				     * This is also the minimum size of
				     * a destination buffer. */
	unsigned int dest_nentries; /* #entries in destination ring -
				     * Must be a power of 2 */
	void *reserved;             /* Future use */
};

/*
 * When using sendlist_send to transfer multiple buffer fragments, the
 * transfer context of each fragment, except last one, will be filled
 * with CE_SENDLIST_ITEM_CTXT. CE_completed_send will return success for
 * each fragment done with send and the transfer context would be
 * CE_SENDLIST_ITEM_CTXT. Upper layer could use this to identify the
 * status of a send completion.
 */
#define CE_SENDLIST_ITEM_CTXT   ((void *)0xcecebeef)

/*
 * This is an opaque type that is at least large enough to hold
 * a sendlist. A sendlist can only be accessed through CE APIs,
 * but this allows a sendlist to be allocated on the run-time
 * stack.  TBDXXX: un-opaque would be simpler...
 */
struct ce_sendlist {
	unsigned int word[62];
};

#define ATH_ISR_NOSCHED  0x0000  /* Do not schedule bottom half/DPC */
#define ATH_ISR_SCHED    0x0001  /* Schedule the bottom half for execution */
#define ATH_ISR_NOTMINE  0x0002  /* for shared IRQ's */

#ifdef IPA_OFFLOAD
/*
 * Copy engine should release resource to micro controller
 * Micro controller needs
   - Copy engine source descriptor base address
   - Copy engine source descriptor size
   - PCI BAR address to access copy engine regiser
 */
void ce_ipa_get_resource(struct CE_handle *ce,
			 uint32_t *ce_sr_base_paddr,
			 uint32_t *ce_sr_ring_size,
			 cdf_dma_addr_t *ce_reg_paddr);
#else
static inline void ce_ipa_get_resource(struct CE_handle *ce,
			 uint32_t *ce_sr_base_paddr,
			 uint32_t *ce_sr_ring_size,
			 cdf_dma_addr_t *ce_reg_paddr)
{
	return;
}
#endif /* IPA_OFFLOAD */

static inline void ce_pkt_error_count_incr(
	struct HIF_CE_state *_hif_state,
	enum ol_ath_hif_pkt_ecodes _hif_ecode)
{
	if (_hif_ecode == HIF_PIPE_NO_RESOURCE)
		(_hif_state->scn->pkt_stats.hif_pipe_no_resrc_count)
		+= 1;
}

bool ce_check_rx_pending(struct ol_softc *scn, int ce_id);
#if defined(FEATURE_LRO)
void ce_lro_flush_cb_register(struct ol_softc *scn,
	 void (handler)(void *), void *data);
void ce_lro_flush_cb_deregister(struct ol_softc *scn);
#endif
#endif /* __COPY_ENGINE_API_H__ */