ceph/src/spdk/dpdk/drivers/bus/fslmc/qbman/include/fsl_qbman_base.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  *
   3  * Copyright (C) 2014 Freescale Semiconductor, Inc.
   4  * Copyright 2017-2018 NXP
   5  *
   6  */
   7 #ifndef _FSL_QBMAN_BASE_H
   8 #define _FSL_QBMAN_BASE_H
   9
  10 /**
  11  * DOC: QBMan basic structures
  12  *
  13  * The QBMan block descriptor, software portal descriptor and Frame descriptor
  14  * are defined here.
  15  *
  16  */
  17
  18 /**
  19  * struct qbman_block_desc - qbman block descriptor structure
  20  * @ccsr_reg_bar: CCSR register map.
  21  * @irq_rerr: Recoverable error interrupt line.
  22  * @irq_nrerr: Non-recoverable error interrupt line
  23  *
  24  * Descriptor for a QBMan instance on the SoC. On partitions/targets that do not
  25  * control this QBMan instance, these values may simply be place-holders. The
  26  * idea is simply that we be able to distinguish between them, eg. so that SWP
  27  * descriptors can identify which QBMan instance they belong to.
  28  */
  29 struct qbman_block_desc {
  30         void *ccsr_reg_bar;
  31         int irq_rerr;
  32         int irq_nrerr;
  33 };
  34
  35 enum qbman_eqcr_mode {
  36         qman_eqcr_vb_ring = 2, /* Valid bit, with eqcr in ring mode */
  37         qman_eqcr_vb_array,    /* Valid bit, with eqcr in array mode */
  38 };
  39
  40 enum qbman_cena_access_mode {
  41         qman_cena_fastest_access = 0, /* Use memory backed node if available */
  42         qman_cena_direct_access,      /* Use direct access to the CENA region */
  43 };
  44
  45 /**
  46  * struct qbman_swp_desc - qbman software portal descriptor structure
  47  * @block: The QBMan instance.
  48  * @cena_bar: Cache-enabled portal register map.
  49  * @cinh_bar: Cache-inhibited portal register map.
  50  * @irq: -1 if unused (or unassigned)
  51  * @idx: SWPs within a QBMan are indexed. -1 if opaque to the user.
  52  * @qman_version: the qman version.
  53  * @eqcr_mode: Select the eqcr mode, currently only valid bit ring mode and
  54  * valid bit array mode are supported.
  55  * @cena_access_mode: Mode used to access the CENA region, direct
  56  *                    or memory backed.
  57  *
  58  * Descriptor for a QBMan software portal, expressed in terms that make sense to
  59  * the user context. Ie. on MC, this information is likely to be true-physical,
  60  * and instantiated statically at compile-time. On GPP, this information is
  61  * likely to be obtained via "discovery" over a partition's "MC bus"
  62  * (ie. in response to a MC portal command), and would take into account any
  63  * virtualisation of the GPP user's address space and/or interrupt numbering.
  64  */
  65 struct qbman_swp_desc {
  66         const struct qbman_block_desc *block;
  67         uint8_t *cena_bar;
  68         uint8_t *cinh_bar;
  69         int irq;
  70         int idx;
  71         uint32_t qman_version;
  72         enum qbman_eqcr_mode eqcr_mode;
  73         enum qbman_cena_access_mode cena_access_mode;
  74 };
  75
  76 /* Driver object for managing a QBMan portal */
  77 struct qbman_swp;
  78
  79 /**
  80  * struct qbman_fd - basci structure for qbman frame descriptor
  81  * @words: for easier/faster copying the whole FD structure.
  82  * @addr_lo: the lower 32 bits of the address in FD.
  83  * @addr_hi: the upper 32 bits of the address in FD.
  84  * @len: the length field in FD.
  85  * @bpid_offset: represent the bpid and offset fields in FD. offset in
  86  * the MS 16 bits, BPID in the LS 16 bits.
  87  * @frc: frame context
  88  * @ctrl: the 32bit control bits including dd, sc,... va, err.
  89  * @flc_lo: the lower 32bit of flow context.
  90  * @flc_hi: the upper 32bits of flow context.
  91  *
  92  * Place-holder for FDs, we represent it via the simplest form that we need for
  93  * now. Different overlays may be needed to support different options, etc. (It
  94  * is impractical to define One True Struct, because the resulting encoding
  95  * routines (lots of read-modify-writes) would be worst-case performance whether
  96  * or not circumstances required them.)
  97  *
  98  * Note, as with all data-structures exchanged between software and hardware (be
  99  * they located in the portal register map or DMA'd to and from main-memory),
 100  * the driver ensures that the caller of the driver API sees the data-structures
 101  * in host-endianness. "struct qbman_fd" is no exception. The 32-bit words
 102  * contained within this structure are represented in host-endianness, even if
 103  * hardware always treats them as little-endian. As such, if any of these fields
 104  * are interpreted in a binary (rather than numerical) fashion by hardware
 105  * blocks (eg. accelerators), then the user should be careful. We illustrate
 106  * with an example;
 107  *
 108  * Suppose the desired behaviour of an accelerator is controlled by the "frc"
 109  * field of the FDs that are sent to it. Suppose also that the behaviour desired
 110  * by the user corresponds to an "frc" value which is expressed as the literal
 111  * sequence of bytes 0xfe, 0xed, 0xab, and 0xba. So "frc" should be the 32-bit
 112  * value in which 0xfe is the first byte and 0xba is the last byte, and as
 113  * hardware is little-endian, this amounts to a 32-bit "value" of 0xbaabedfe. If
 114  * the software is little-endian also, this can simply be achieved by setting
 115  * frc=0xbaabedfe. On the other hand, if software is big-endian, it should set
 116  * frc=0xfeedabba! The best away of avoiding trouble with this sort of thing is
 117  * to treat the 32-bit words as numerical values, in which the offset of a field
 118  * from the beginning of the first byte (as required or generated by hardware)
 119  * is numerically encoded by a left-shift (ie. by raising the field to a
 120  * corresponding power of 2).  Ie. in the current example, software could set
 121  * "frc" in the following way, and it would work correctly on both little-endian
 122  * and big-endian operation;
 123  *    fd.frc = (0xfe << 0) | (0xed << 8) | (0xab << 16) | (0xba << 24);
 124  */
 125 struct qbman_fd {
 126         union {
 127                 uint32_t words[8];
 128                 struct qbman_fd_simple {
 129                         uint32_t addr_lo;
 130                         uint32_t addr_hi;
 131                         uint32_t len;
 132                         uint32_t bpid_offset;
 133                         uint32_t frc;
 134                         uint32_t ctrl;
 135                         uint32_t flc_lo;
 136                         uint32_t flc_hi;
 137                 } simple;
 138         };
 139 };
 140
 141 #endif /* !_FSL_QBMAN_BASE_H */