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nuttx/drivers/wireless/ieee80211/bcm43xxx/bcmf_gspi_f2_frame.c

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/****************************************************************************
* drivers/wireless/ieee80211/bcm43xxx/bcmf_gspi_f2_frame.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/compiler.h>
#include <debug.h>
#include <errno.h>
#include <assert.h>
#include <nuttx/arch.h>
#include <stddef.h>
#include <string.h>
#include "bcmf_core.h"
#include "bcmf_sdpcm.h"
#include "bcmf_cdc.h"
#include "bcmf_bdc.h"
#include "bcmf_utils.h"
#include "bcmf_netdev.h"
#include "bcmf_sdio_regs.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define F2_FRAME_CONTROL_CHANNEL 0 /* Control frame id */
#define F2_FRAME_EVENT_CHANNEL 1 /* Asynchronous event frame id */
#define F2_FRAME_DATA_CHANNEL 2 /* Data frame id */
/****************************************************************************
* Private Types
****************************************************************************/
begin_packed_struct struct f2_frame_header_s
{
uint16_t size;
uint16_t checksum;
uint8_t sequence;
uint8_t channel;
uint8_t next_length;
uint8_t data_offset;
uint8_t flow_control;
uint8_t credit;
uint16_t padding;
} end_packed_struct;
typedef struct f2_frame_header_s f2_frame_header_t;
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: f2_frame_rx_fail
****************************************************************************/
static int f2_frame_rx_fail(FAR bcmf_gspi_dev_t *gbus, bool retry)
{
/* issue abort command for F2 through F0 */
bcmf_bus_io_abort(gbus);
bcmf_write_reg(gbus, 1, SBSDIO_FUNC1_FRAMECTRL, SFC_RF_TERM);
/* TODO Wait until the packet has been flushed (device/FIFO stable) */
if (retry)
{
/* Send NAK to retry to read frame */
bcmf_write_sbregb(gbus,
CORE_BUS_REG(gbus->chip->core_base[SDIOD_CORE_ID],
tosbmailbox),
SMB_NAK);
}
return OK;
}
/****************************************************************************
* Name: process_f2_frame_header
****************************************************************************/
int process_f2_frame_header(FAR bcmf_interface_dev_t *gbus,
f2_frame_header_t *header)
{
if (header->data_offset < sizeof(f2_frame_header_t)
|| header->data_offset > header->size)
{
wlerr("Invalid data offset\n");
f2_frame_rx_fail(gbus, false);
return -ENXIO;
}
/* Update tx credits */
gbus->max_seq = header->credit;
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: read_f2_frame
*
* Description:
* Read and process an F2 frame.
*
* Parameters:
* priv - the device structure
* frame_length - Length of frame we are to read. (From chip status)
*
* Returns:
* OK on success, negated error code on failure.
****************************************************************************/
int bcmf_gspi_read_f2_frame(FAR struct bcmf_dev_s *priv,
int frame_length)
{
FAR bcmf_gspi_dev_t *gbus = (FAR bcmf_gspi_dev_t *)priv->bus;
FAR gspi_dev_t *gspi = gbus->gspi;
bcmf_interface_frame_t *iframe;
f2_frame_header_t *header;
int ret;
uint16_t checksum;
/* Request free frame buffer */
if (frame_length <= sizeof(f2_frame_header_t))
{
return -EINVAL;
}
iframe = bcmf_interface_allocate_frame(priv, false, false);
if (iframe == NULL)
{
wlinfo("fail alloc\n");
return -EAGAIN;
}
if (frame_length > iframe->header.len)
{
wlerr("Frame is too large, cancel %d > %d\n",
frame_length,
iframe->header.len);
ret = -ENOMEM;
goto exit_abort;
}
/* Read the frame data (the buffer is DMA aligned here) */
ret = gspi->read(gspi,
true,
gspi_f2_dma,
0,
frame_length,
(uint32_t *) iframe->data);
if (ret != OK)
{
wlinfo("Failed to read frame data\n");
ret = -EIO;
goto exit_abort;
}
header = (f2_frame_header_t *)iframe->data;
if (header->size == 0)
{
ret = OK;
goto exit_free_frame;
}
checksum = header->size | header->checksum;
if (checksum != 0xffff || header->size < sizeof(f2_frame_header_t))
{
wlerr("Checksum failed: size:.0x%04X checksum: 0x%04X\n",
header->size,
header->checksum);
bcmf_hexdump((uint8_t *)header, MIN(header->size, 64), 0);
f2_frame_rx_fail(gbus, false);
return -EINVAL;
}
/* Process and validate header */
ret = process_f2_frame_header(gbus, header);
if (ret != OK)
{
wlerr("Error while processing header %d\n", ret);
ret = -EINVAL;
goto exit_free_frame;
}
if (header->size == FC_UPDATE_PKT_LENGTH)
{
/* Flow control update packet with no data */
return OK;
}
/* Update frame structure */
iframe->header.len = header->size;
iframe->header.data += header->data_offset;
/* Process received frame content */
switch (header->channel & 0x0f)
{
case F2_FRAME_CONTROL_CHANNEL:
ret = bcmf_cdc_process_control_frame(priv, &iframe->header);
goto exit_free_frame;
case F2_FRAME_EVENT_CHANNEL:
if (header->data_offset == header->size)
{
/* Empty event, ignore */
ret = OK;
}
else
{
ret = bcmf_bdc_process_event_frame(priv, &iframe->header);
}
goto exit_free_frame;
case F2_FRAME_DATA_CHANNEL:
/* Queue frame and notify network layer frame is available */
if (nxsem_wait_uninterruptible(&gbus->queue_mutex) < 0)
{
DEBUGPANIC();
}
list_add_tail(&gbus->rx_queue, &iframe->list_entry);
nxsem_post(&gbus->queue_mutex);
bcmf_netdev_notify_rx(priv);
/* Upper layer have to free all received frames */
ret = OK;
break;
default:
wlerr("Got unexpected message type %d\n", header->channel);
ret = -EINVAL;
goto exit_free_frame;
}
return ret;
exit_abort:
f2_frame_rx_fail(gbus, false);
exit_free_frame:
bcmf_interface_free_frame(priv, iframe);
return ret;
}
/****************************************************************************
* Name: bcmf_gspi_send_f2_frame
*
* Description:
* De-queue and send an F2 frame.
*
* Parameters:
* priv - the device structure
*
* Returns:
* OK on success, negated error code on failure.
****************************************************************************/
int bcmf_gspi_send_f2_frame(FAR struct bcmf_dev_s *priv)
{
FAR bcmf_gspi_dev_t *gbus = (FAR bcmf_gspi_dev_t *)priv->bus;
FAR gspi_dev_t *gspi = gbus->gspi;
f2_frame_header_t *header;
bcmf_interface_frame_t *iframe;
int ret;
bool is_txframe;
if (list_is_empty(&gbus->tx_queue))
{
/* No more frames to send */
return -ENODATA;
}
if (gbus->tx_seq == gbus->max_seq)
{
/* TODO handle this case */
wlerr("No credit to send frame\n");
return -EAGAIN;
}
if (nxsem_wait_uninterruptible(&gbus->queue_mutex) < 0)
{
DEBUGPANIC();
}
iframe = list_remove_head_type(&gbus->tx_queue,
bcmf_interface_frame_t,
list_entry);
nxsem_post(&gbus->queue_mutex);
is_txframe = iframe->tx;
header = (f2_frame_header_t *)iframe->header.base;
/* Set frame sequence id */
header->sequence = gbus->tx_seq++;
#if 0
wlinfo("\n>>>---> Send frame %p %d\n", iframe, iframe->header.len);
wlinfo("size:%d seq: %d, channel: %d next len: %d\n",
header->size,
header->sequence,
header->channel,
header->next_length);
wlinfo("data offset:0x%02X flow: %d, credit: %d\n",
header->data_offset,
header->flow_control,
header->credit);
#endif
#if 0
bcmf_hexdump(iframe->header.base, iframe->header.len,
(unsigned long)iframe->header.base);
#endif
/* Write the frame data (the buffer is DMA aligned here) */
ret = gspi->write(gspi,
true,
gspi_f2_dma,
0,
iframe->header.len,
(FAR uint32_t *) iframe->header.base);
/* Free frame buffer */
bcmf_interface_free_frame(priv, iframe);
if (ret == OK && is_txframe)
{
/* Notify upper layer at least one TX buffer is available */
bcmf_netdev_notify_tx(priv);
}
return ret;
}
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