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166 lines
4.2 KiB
166 lines
4.2 KiB
/* |
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* Copyright (c) 2011, 2012, Atheros Communications Inc. |
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* Copyright (c) 2014, I2SE GmbH |
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* |
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* Permission to use, copy, modify, and/or distribute this software |
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* for any purpose with or without fee is hereby granted, provided |
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* that the above copyright notice and this permission notice appear |
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* in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL |
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* WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED |
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* WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL |
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* THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR |
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM |
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, |
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* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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/* Atheros ethernet framing. Every Ethernet frame is surrounded |
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* by an atheros frame while transmitted over a serial channel; |
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*/ |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include "qca_7k_common.h" |
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u16 |
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qcafrm_create_header(u8 *buf, u16 length) |
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{ |
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__le16 len; |
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if (!buf) |
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return 0; |
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len = cpu_to_le16(length); |
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buf[0] = 0xAA; |
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buf[1] = 0xAA; |
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buf[2] = 0xAA; |
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buf[3] = 0xAA; |
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buf[4] = len & 0xff; |
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buf[5] = (len >> 8) & 0xff; |
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buf[6] = 0; |
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buf[7] = 0; |
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return QCAFRM_HEADER_LEN; |
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} |
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EXPORT_SYMBOL_GPL(qcafrm_create_header); |
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u16 |
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qcafrm_create_footer(u8 *buf) |
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{ |
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if (!buf) |
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return 0; |
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buf[0] = 0x55; |
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buf[1] = 0x55; |
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return QCAFRM_FOOTER_LEN; |
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} |
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EXPORT_SYMBOL_GPL(qcafrm_create_footer); |
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/* Gather received bytes and try to extract a full ethernet frame by |
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* following a simple state machine. |
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* |
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* Return: QCAFRM_GATHER No ethernet frame fully received yet. |
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* QCAFRM_NOHEAD Header expected but not found. |
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* QCAFRM_INVLEN Atheros frame length is invalid |
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* QCAFRM_NOTAIL Footer expected but not found. |
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* > 0 Number of byte in the fully received |
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* Ethernet frame |
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*/ |
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s32 |
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qcafrm_fsm_decode(struct qcafrm_handle *handle, u8 *buf, u16 buf_len, u8 recv_byte) |
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{ |
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s32 ret = QCAFRM_GATHER; |
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u16 len; |
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switch (handle->state) { |
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case QCAFRM_HW_LEN0: |
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case QCAFRM_HW_LEN1: |
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/* by default, just go to next state */ |
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handle->state--; |
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if (recv_byte != 0x00) { |
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/* first two bytes of length must be 0 */ |
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handle->state = handle->init; |
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} |
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break; |
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case QCAFRM_HW_LEN2: |
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case QCAFRM_HW_LEN3: |
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handle->state--; |
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break; |
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/* 4 bytes header pattern */ |
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case QCAFRM_WAIT_AA1: |
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case QCAFRM_WAIT_AA2: |
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case QCAFRM_WAIT_AA3: |
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case QCAFRM_WAIT_AA4: |
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if (recv_byte != 0xAA) { |
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ret = QCAFRM_NOHEAD; |
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handle->state = handle->init; |
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} else { |
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handle->state--; |
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} |
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break; |
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/* 2 bytes length. */ |
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/* Borrow offset field to hold length for now. */ |
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case QCAFRM_WAIT_LEN_BYTE0: |
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handle->offset = recv_byte; |
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handle->state = QCAFRM_WAIT_LEN_BYTE1; |
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break; |
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case QCAFRM_WAIT_LEN_BYTE1: |
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handle->offset = handle->offset | (recv_byte << 8); |
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handle->state = QCAFRM_WAIT_RSVD_BYTE1; |
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break; |
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case QCAFRM_WAIT_RSVD_BYTE1: |
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handle->state = QCAFRM_WAIT_RSVD_BYTE2; |
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break; |
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case QCAFRM_WAIT_RSVD_BYTE2: |
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len = handle->offset; |
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if (len > buf_len || len < QCAFRM_MIN_LEN) { |
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ret = QCAFRM_INVLEN; |
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handle->state = handle->init; |
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} else { |
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handle->state = (enum qcafrm_state)(len + 1); |
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/* Remaining number of bytes. */ |
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handle->offset = 0; |
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} |
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break; |
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default: |
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/* Receiving Ethernet frame itself. */ |
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buf[handle->offset] = recv_byte; |
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handle->offset++; |
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handle->state--; |
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break; |
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case QCAFRM_WAIT_551: |
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if (recv_byte != 0x55) { |
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ret = QCAFRM_NOTAIL; |
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handle->state = handle->init; |
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} else { |
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handle->state = QCAFRM_WAIT_552; |
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} |
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break; |
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case QCAFRM_WAIT_552: |
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if (recv_byte != 0x55) { |
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ret = QCAFRM_NOTAIL; |
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handle->state = handle->init; |
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} else { |
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ret = handle->offset; |
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/* Frame is fully received. */ |
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handle->state = handle->init; |
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} |
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break; |
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} |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(qcafrm_fsm_decode); |
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MODULE_DESCRIPTION("Qualcomm Atheros QCA7000 common"); |
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MODULE_AUTHOR("Qualcomm Atheros Communications"); |
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MODULE_AUTHOR("Stefan Wahren <[email protected]>"); |
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MODULE_LICENSE("Dual BSD/GPL");
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