You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
166 lines
4.2 KiB
166 lines
4.2 KiB
/*
|
|
* 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;
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
|
|
#include "qca_7k_common.h"
|
|
|
|
u16
|
|
qcafrm_create_header(u8 *buf, u16 length)
|
|
{
|
|
__le16 len;
|
|
|
|
if (!buf)
|
|
return 0;
|
|
|
|
len = cpu_to_le16(length);
|
|
|
|
buf[0] = 0xAA;
|
|
buf[1] = 0xAA;
|
|
buf[2] = 0xAA;
|
|
buf[3] = 0xAA;
|
|
buf[4] = len & 0xff;
|
|
buf[5] = (len >> 8) & 0xff;
|
|
buf[6] = 0;
|
|
buf[7] = 0;
|
|
|
|
return QCAFRM_HEADER_LEN;
|
|
}
|
|
EXPORT_SYMBOL_GPL(qcafrm_create_header);
|
|
|
|
u16
|
|
qcafrm_create_footer(u8 *buf)
|
|
{
|
|
if (!buf)
|
|
return 0;
|
|
|
|
buf[0] = 0x55;
|
|
buf[1] = 0x55;
|
|
return QCAFRM_FOOTER_LEN;
|
|
}
|
|
EXPORT_SYMBOL_GPL(qcafrm_create_footer);
|
|
|
|
/* 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 Atheros 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)
|
|
{
|
|
s32 ret = QCAFRM_GATHER;
|
|
u16 len;
|
|
|
|
switch (handle->state) {
|
|
case QCAFRM_HW_LEN0:
|
|
case QCAFRM_HW_LEN1:
|
|
/* by default, just go to next state */
|
|
handle->state--;
|
|
|
|
if (recv_byte != 0x00) {
|
|
/* first two bytes of length must be 0 */
|
|
handle->state = handle->init;
|
|
}
|
|
break;
|
|
case QCAFRM_HW_LEN2:
|
|
case QCAFRM_HW_LEN3:
|
|
handle->state--;
|
|
break;
|
|
/* 4 bytes header pattern */
|
|
case QCAFRM_WAIT_AA1:
|
|
case QCAFRM_WAIT_AA2:
|
|
case QCAFRM_WAIT_AA3:
|
|
case QCAFRM_WAIT_AA4:
|
|
if (recv_byte != 0xAA) {
|
|
ret = QCAFRM_NOHEAD;
|
|
handle->state = handle->init;
|
|
} else {
|
|
handle->state--;
|
|
}
|
|
break;
|
|
/* 2 bytes length. */
|
|
/* Borrow offset field to hold length for now. */
|
|
case QCAFRM_WAIT_LEN_BYTE0:
|
|
handle->offset = recv_byte;
|
|
handle->state = QCAFRM_WAIT_LEN_BYTE1;
|
|
break;
|
|
case QCAFRM_WAIT_LEN_BYTE1:
|
|
handle->offset = handle->offset | (recv_byte << 8);
|
|
handle->state = QCAFRM_WAIT_RSVD_BYTE1;
|
|
break;
|
|
case QCAFRM_WAIT_RSVD_BYTE1:
|
|
handle->state = QCAFRM_WAIT_RSVD_BYTE2;
|
|
break;
|
|
case QCAFRM_WAIT_RSVD_BYTE2:
|
|
len = handle->offset;
|
|
if (len > buf_len || len < QCAFRM_MIN_LEN) {
|
|
ret = QCAFRM_INVLEN;
|
|
handle->state = handle->init;
|
|
} else {
|
|
handle->state = (enum qcafrm_state)(len + 1);
|
|
/* Remaining number of bytes. */
|
|
handle->offset = 0;
|
|
}
|
|
break;
|
|
default:
|
|
/* Receiving Ethernet frame itself. */
|
|
buf[handle->offset] = recv_byte;
|
|
handle->offset++;
|
|
handle->state--;
|
|
break;
|
|
case QCAFRM_WAIT_551:
|
|
if (recv_byte != 0x55) {
|
|
ret = QCAFRM_NOTAIL;
|
|
handle->state = handle->init;
|
|
} else {
|
|
handle->state = QCAFRM_WAIT_552;
|
|
}
|
|
break;
|
|
case QCAFRM_WAIT_552:
|
|
if (recv_byte != 0x55) {
|
|
ret = QCAFRM_NOTAIL;
|
|
handle->state = handle->init;
|
|
} else {
|
|
ret = handle->offset;
|
|
/* Frame is fully received. */
|
|
handle->state = handle->init;
|
|
}
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(qcafrm_fsm_decode);
|
|
|
|
MODULE_DESCRIPTION("Qualcomm Atheros QCA7000 common");
|
|
MODULE_AUTHOR("Qualcomm Atheros Communications");
|
|
MODULE_AUTHOR("Stefan Wahren <stefan.wahren@i2se.com>");
|
|
MODULE_LICENSE("Dual BSD/GPL");
|
|
|