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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 | /* * Copyright (c) 2011, 2012, Atheros Communications Inc. * Copyright (c) 2014, I2SE GmbH * * 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. */ /* Atheros Ethernet framing. Every Ethernet frame is surrounded by an atheros * frame while transmitted over a serial channel. */ #ifndef _QCA_FRAMING_H #define _QCA_FRAMING_H #include <linux/if_ether.h> #include <linux/if_vlan.h> #include <linux/types.h> /* Frame is currently being received */ #define QCAFRM_GATHER 0 /* No header byte while expecting it */ #define QCAFRM_NOHEAD (QCAFRM_ERR_BASE - 1) /* No tailer byte while expecting it */ #define QCAFRM_NOTAIL (QCAFRM_ERR_BASE - 2) /* Frame length is invalid */ #define QCAFRM_INVLEN (QCAFRM_ERR_BASE - 3) /* Frame length is invalid */ #define QCAFRM_INVFRAME (QCAFRM_ERR_BASE - 4) /* Min/Max Ethernet MTU: 46/1500 */ #define QCAFRM_MIN_MTU (ETH_ZLEN - ETH_HLEN) #define QCAFRM_MAX_MTU ETH_DATA_LEN /* Min/Max frame lengths */ #define QCAFRM_MIN_LEN (QCAFRM_MIN_MTU + ETH_HLEN) #define QCAFRM_MAX_LEN (QCAFRM_MAX_MTU + VLAN_ETH_HLEN) /* QCA7K header len */ #define QCAFRM_HEADER_LEN 8 /* QCA7K footer len */ #define QCAFRM_FOOTER_LEN 2 /* QCA7K Framing. */ #define QCAFRM_ERR_BASE -1000 enum qcafrm_state { /* HW length is only available on SPI */ QCAFRM_HW_LEN0 = 0x8000, QCAFRM_HW_LEN1 = QCAFRM_HW_LEN0 - 1, QCAFRM_HW_LEN2 = QCAFRM_HW_LEN1 - 1, QCAFRM_HW_LEN3 = QCAFRM_HW_LEN2 - 1, /* Waiting first 0xAA of header */ QCAFRM_WAIT_AA1 = QCAFRM_HW_LEN3 - 1, /* Waiting second 0xAA of header */ QCAFRM_WAIT_AA2 = QCAFRM_WAIT_AA1 - 1, /* Waiting third 0xAA of header */ QCAFRM_WAIT_AA3 = QCAFRM_WAIT_AA2 - 1, /* Waiting fourth 0xAA of header */ QCAFRM_WAIT_AA4 = QCAFRM_WAIT_AA3 - 1, /* Waiting Byte 0-1 of length (litte endian) */ QCAFRM_WAIT_LEN_BYTE0 = QCAFRM_WAIT_AA4 - 1, QCAFRM_WAIT_LEN_BYTE1 = QCAFRM_WAIT_AA4 - 2, /* Reserved bytes */ QCAFRM_WAIT_RSVD_BYTE1 = QCAFRM_WAIT_AA4 - 3, QCAFRM_WAIT_RSVD_BYTE2 = QCAFRM_WAIT_AA4 - 4, /* The frame length is used as the state until * the end of the Ethernet frame * Waiting for first 0x55 of footer */ QCAFRM_WAIT_551 = 1, /* Waiting for second 0x55 of footer */ QCAFRM_WAIT_552 = QCAFRM_WAIT_551 - 1 }; /* Structure to maintain the frame decoding during reception. */ struct qcafrm_handle { /* Current decoding state */ enum qcafrm_state state; /* Initial state depends on connection type */ enum qcafrm_state init; /* Offset in buffer (borrowed for length too) */ u16 offset; /* Frame length as kept by this module */ u16 len; }; u16 qcafrm_create_header(u8 *buf, u16 len); u16 qcafrm_create_footer(u8 *buf); static inline void qcafrm_fsm_init_spi(struct qcafrm_handle *handle) { handle->init = QCAFRM_HW_LEN0; handle->state = handle->init; } static inline void qcafrm_fsm_init_uart(struct qcafrm_handle *handle) { handle->init = QCAFRM_WAIT_AA1; handle->state = handle->init; } /* Gather received bytes and try to extract a full Ethernet frame * by following a simple state machine. * * Return: QCAFRM_GATHER No Ethernet frame fully received yet. * QCAFRM_NOHEAD Header expected but not found. * QCAFRM_INVLEN QCA7K frame length is invalid * QCAFRM_NOTAIL Footer expected but not found. * > 0 Number of byte in the fully received * Ethernet frame */ s32 qcafrm_fsm_decode(struct qcafrm_handle *handle, u8 *buf, u16 buf_len, u8 recv_byte); #endif /* _QCA_FRAMING_H */ |