/*
 * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
 *
 * This program is free software; you may redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#ifndef _VNIC_DEVCMD_H_
#define _VNIC_DEVCMD_H_

#define _CMD_NBITS      14
#define _CMD_VTYPEBITS  10
#define _CMD_FLAGSBITS  6
#define _CMD_DIRBITS    2

#define _CMD_NMASK      ((1 << _CMD_NBITS)-1)
#define _CMD_VTYPEMASK  ((1 << _CMD_VTYPEBITS)-1)
#define _CMD_FLAGSMASK  ((1 << _CMD_FLAGSBITS)-1)
#define _CMD_DIRMASK    ((1 << _CMD_DIRBITS)-1)

#define _CMD_NSHIFT     0
#define _CMD_VTYPESHIFT (_CMD_NSHIFT+_CMD_NBITS)
#define _CMD_FLAGSSHIFT (_CMD_VTYPESHIFT+_CMD_VTYPEBITS)
#define _CMD_DIRSHIFT   (_CMD_FLAGSSHIFT+_CMD_FLAGSBITS)

/*
 * Direction bits (from host perspective).
 */
#define _CMD_DIR_NONE   0U
#define _CMD_DIR_WRITE  1U
#define _CMD_DIR_READ   2U
#define _CMD_DIR_RW     (_CMD_DIR_WRITE | _CMD_DIR_READ)

/*
 * Flag bits.
 */
#define _CMD_FLAGS_NONE 0U
#define _CMD_FLAGS_NOWAIT 1U

/*
 * vNIC type bits.
 */
#define _CMD_VTYPE_NONE  0U
#define _CMD_VTYPE_ENET  1U
#define _CMD_VTYPE_FC    2U
#define _CMD_VTYPE_SCSI  4U
#define _CMD_VTYPE_ALL   (_CMD_VTYPE_ENET | _CMD_VTYPE_FC | _CMD_VTYPE_SCSI)

/*
 * Used to create cmds..
*/
#define _CMDCF(dir, flags, vtype, nr)  \
        (((dir)   << _CMD_DIRSHIFT) | \
        ((flags) << _CMD_FLAGSSHIFT) | \
        ((vtype) << _CMD_VTYPESHIFT) | \
        ((nr)    << _CMD_NSHIFT))
#define _CMDC(dir, vtype, nr)    _CMDCF(dir, 0, vtype, nr)
#define _CMDCNW(dir, vtype, nr)  _CMDCF(dir, _CMD_FLAGS_NOWAIT, vtype, nr)

/*
 * Used to decode cmds..
*/
#define _CMD_DIR(cmd)            (((cmd) >> _CMD_DIRSHIFT) & _CMD_DIRMASK)
#define _CMD_FLAGS(cmd)          (((cmd) >> _CMD_FLAGSSHIFT) & _CMD_FLAGSMASK)
#define _CMD_VTYPE(cmd)          (((cmd) >> _CMD_VTYPESHIFT) & _CMD_VTYPEMASK)
#define _CMD_N(cmd)              (((cmd) >> _CMD_NSHIFT) & _CMD_NMASK)

enum vnic_devcmd_cmd {
        CMD_NONE                = _CMDC(_CMD_DIR_NONE, _CMD_VTYPE_NONE, 0),

        /* mcpu fw info in mem: (u64)a0=paddr to struct vnic_devcmd_fw_info */
        CMD_MCPU_FW_INFO        = _CMDC(_CMD_DIR_WRITE, _CMD_VTYPE_ALL, 1),

        /* dev-specific block member:
         *    in: (u16)a0=offset,(u8)a1=size
         *    out: a0=value */
        CMD_DEV_SPEC            = _CMDC(_CMD_DIR_RW, _CMD_VTYPE_ALL, 2),

        /* stats clear */
        CMD_STATS_CLEAR         = _CMDCNW(_CMD_DIR_NONE, _CMD_VTYPE_ALL, 3),

        /* stats dump in mem: (u64)a0=paddr to stats area,
         *                    (u16)a1=sizeof stats area */
        CMD_STATS_DUMP          = _CMDC(_CMD_DIR_WRITE, _CMD_VTYPE_ALL, 4),

        /* nic_cfg in (u32)a0 */
        CMD_NIC_CFG             = _CMDCNW(_CMD_DIR_WRITE, _CMD_VTYPE_ALL, 16),

        /* set struct vnic_devcmd_notify buffer in mem:
         * in:
         *   (u64)a0=paddr to notify (set paddr=0 to unset)
         *   (u32)a1 & 0x00000000ffffffff=sizeof(struct vnic_devcmd_notify)
         *   (u16)a1 & 0x0000ffff00000000=intr num (-1 for no intr)
         * out:
         *   (u32)a1 = effective size
         */
        CMD_NOTIFY              = _CMDC(_CMD_DIR_RW, _CMD_VTYPE_ALL, 21),

        /* initiate open sequence (u32)a0=flags (see CMD_OPENF_*) */
        CMD_OPEN                = _CMDCNW(_CMD_DIR_WRITE, _CMD_VTYPE_ALL, 23),

        /* open status:
         *    out: a0=0 open complete, a0=1 open in progress */
        CMD_OPEN_STATUS         = _CMDC(_CMD_DIR_READ, _CMD_VTYPE_ALL, 24),

        /* close vnic */
        CMD_CLOSE               = _CMDC(_CMD_DIR_NONE, _CMD_VTYPE_ALL, 25),

        /* initialize virtual link: (u32)a0=flags (see CMD_INITF_*) */
        CMD_INIT                = _CMDCNW(_CMD_DIR_READ, _CMD_VTYPE_ALL, 26),

        /* enable virtual link */
        CMD_ENABLE              = _CMDCNW(_CMD_DIR_WRITE, _CMD_VTYPE_ALL, 28),

        /* enable virtual link, waiting variant. */
        CMD_ENABLE_WAIT         = _CMDC(_CMD_DIR_WRITE, _CMD_VTYPE_ALL, 28),

        /* disable virtual link */
        CMD_DISABLE             = _CMDC(_CMD_DIR_NONE, _CMD_VTYPE_ALL, 29),

        /* stats dump all vnics on uplink in mem: (u64)a0=paddr (u32)a1=uif */
        CMD_STATS_DUMP_ALL      = _CMDC(_CMD_DIR_WRITE, _CMD_VTYPE_ALL, 30),

        /* init status:
         *    out: a0=0 init complete, a0=1 init in progress
         *         if a0=0, a1=errno */
        CMD_INIT_STATUS         = _CMDC(_CMD_DIR_READ, _CMD_VTYPE_ALL, 31),

        /* undo initialize of virtual link */
        CMD_DEINIT              = _CMDCNW(_CMD_DIR_NONE, _CMD_VTYPE_ALL, 34),

        /* check fw capability of a cmd:
         * in:  (u32)a0=cmd
         * out: (u32)a0=errno, 0:valid cmd, a1=supported VNIC_STF_* bits */
        CMD_CAPABILITY      = _CMDC(_CMD_DIR_RW, _CMD_VTYPE_ALL, 36),

        /*
         * Initialization for the devcmd2 interface.
         * in: (u64) a0=host result buffer physical address
         * in: (u16) a1=number of entries in result buffer
         */
        CMD_INITIALIZE_DEVCMD2 = _CMDC(_CMD_DIR_WRITE, _CMD_VTYPE_ALL, 57)
};

/* flags for CMD_OPEN */
#define CMD_OPENF_OPROM         0x1     /* open coming from option rom */

/* flags for CMD_INIT */
#define CMD_INITF_DEFAULT_MAC   0x1     /* init with default mac addr */

/* flags for CMD_PACKET_FILTER */
#define CMD_PFILTER_DIRECTED            0x01
#define CMD_PFILTER_MULTICAST           0x02
#define CMD_PFILTER_BROADCAST           0x04
#define CMD_PFILTER_PROMISCUOUS         0x08
#define CMD_PFILTER_ALL_MULTICAST       0x10

enum vnic_devcmd_status {
        STAT_NONE = 0,
        STAT_BUSY = 1 << 0,     /* cmd in progress */
        STAT_ERROR = 1 << 1,    /* last cmd caused error (code in a0) */
};

enum vnic_devcmd_error {
        ERR_SUCCESS = 0,
        ERR_EINVAL = 1,
        ERR_EFAULT = 2,
        ERR_EPERM = 3,
        ERR_EBUSY = 4,
        ERR_ECMDUNKNOWN = 5,
        ERR_EBADSTATE = 6,
        ERR_ENOMEM = 7,
        ERR_ETIMEDOUT = 8,
        ERR_ELINKDOWN = 9,
};

struct vnic_devcmd_fw_info {
        char fw_version[32];
        char fw_build[32];
        char hw_version[32];
        char hw_serial_number[32];
};

struct vnic_devcmd_notify {
        u32 csum;               /* checksum over following words */

        u32 link_state;         /* link up == 1 */
        u32 port_speed;         /* effective port speed (rate limit) */
        u32 mtu;                /* MTU */
        u32 msglvl;             /* requested driver msg lvl */
        u32 uif;                /* uplink interface */
        u32 status;             /* status bits (see VNIC_STF_*) */
        u32 error;              /* error code (see ERR_*) for first ERR */
        u32 link_down_cnt;      /* running count of link down transitions */
};
#define VNIC_STF_FATAL_ERR      0x0001  /* fatal fw error */

struct vnic_devcmd_provinfo {
        u8 oui[3];
        u8 type;
        u8 data[];
};

/*
 * Writing cmd register causes STAT_BUSY to get set in status register.
 * When cmd completes, STAT_BUSY will be cleared.
 *
 * If cmd completed successfully STAT_ERROR will be clear
 * and args registers contain cmd-specific results.
 *
 * If cmd error, STAT_ERROR will be set and args[0] contains error code.
 *
 * status register is read-only.  While STAT_BUSY is set,
 * all other register contents are read-only.
 */

/* Make sizeof(vnic_devcmd) a power-of-2 for I/O BAR. */
#define VNIC_DEVCMD_NARGS 15
struct vnic_devcmd {
        u32 status;                     /* RO */
        u32 cmd;                        /* RW */
        u64 args[VNIC_DEVCMD_NARGS];    /* RW cmd args (little-endian) */
};


/*
 * Version 2 of the interface.
 *
 * Some things are carried over, notably the vnic_devcmd_cmd enum.
 */

/*
 * Flags for vnic_devcmd2.flags
 */

#define DEVCMD2_FNORESULT       0x1     /* Don't copy result to host */

#define VNIC_DEVCMD2_NARGS      VNIC_DEVCMD_NARGS
struct vnic_devcmd2 {
        u16 pad;
        u16 flags;
        u32 cmd;                /* same command #defines as original */
        u64 args[VNIC_DEVCMD2_NARGS];
};

#define VNIC_DEVCMD2_NRESULTS   VNIC_DEVCMD_NARGS
struct devcmd2_result {
        u64 results[VNIC_DEVCMD2_NRESULTS];
        u32 pad;
        u16 completed_index;    /* into copy WQ */
        u8  error;              /* same error codes as original */
        u8  color;              /* 0 or 1 as with completion queues */
};

#define DEVCMD2_RING_SIZE   32
#define DEVCMD2_DESC_SIZE   128

#define DEVCMD2_RESULTS_SIZE_MAX   ((1 << 16) - 1)

#endif /* _VNIC_DEVCMD_H_ */