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/*
*
* Copyright (c) 2011, 2012, Qualcomm 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.
*
*/
/* This module implements the Qualcomm Atheros SPI protocol for
* kernel-based SPI device.
*/
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/spi/spi.h>
#include "qca_7k.h"
void
qcaspi_spi_error(struct qcaspi *qca)
{
if (qca->sync != QCASPI_SYNC_READY)
return;
netdev_err(qca->net_dev, "spi error\n");
qca->sync = QCASPI_SYNC_UNKNOWN;
qca->stats.spi_err++;
}
int
qcaspi_read_register(struct qcaspi *qca, u16 reg, u16 *result)
{
__be16 rx_data;
__be16 tx_data;
struct spi_transfer *transfer;
struct spi_message *msg;
int ret;
tx_data = cpu_to_be16(QCA7K_SPI_READ | QCA7K_SPI_INTERNAL | reg);
if (qca->legacy_mode) {
msg = &qca->spi_msg1;
transfer = &qca->spi_xfer1;
transfer->tx_buf = &tx_data;
transfer->rx_buf = NULL;
transfer->len = QCASPI_CMD_LEN;
spi_sync(qca->spi_dev, msg);
} else {
msg = &qca->spi_msg2;
transfer = &qca->spi_xfer2[0];
transfer->tx_buf = &tx_data;
transfer->rx_buf = NULL;
transfer->len = QCASPI_CMD_LEN;
transfer = &qca->spi_xfer2[1];
}
transfer->tx_buf = NULL;
transfer->rx_buf = &rx_data;
transfer->len = QCASPI_CMD_LEN;
ret = spi_sync(qca->spi_dev, msg);
if (!ret)
ret = msg->status;
if (ret)
qcaspi_spi_error(qca);
else
*result = be16_to_cpu(rx_data);
return ret;
}
int
qcaspi_write_register(struct qcaspi *qca, u16 reg, u16 value)
{
__be16 tx_data[2];
struct spi_transfer *transfer;
struct spi_message *msg;
int ret;
tx_data[0] = cpu_to_be16(QCA7K_SPI_WRITE | QCA7K_SPI_INTERNAL | reg);
tx_data[1] = cpu_to_be16(value);
if (qca->legacy_mode) {
msg = &qca->spi_msg1;
transfer = &qca->spi_xfer1;
transfer->tx_buf = &tx_data[0];
transfer->rx_buf = NULL;
transfer->len = QCASPI_CMD_LEN;
spi_sync(qca->spi_dev, msg);
} else {
msg = &qca->spi_msg2;
transfer = &qca->spi_xfer2[0];
transfer->tx_buf = &tx_data[0];
transfer->rx_buf = NULL;
transfer->len = QCASPI_CMD_LEN;
transfer = &qca->spi_xfer2[1];
}
transfer->tx_buf = &tx_data[1];
transfer->rx_buf = NULL;
transfer->len = QCASPI_CMD_LEN;
ret = spi_sync(qca->spi_dev, msg);
if (!ret)
ret = msg->status;
if (ret)
qcaspi_spi_error(qca);
return ret;
}
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