forked from Minki/linux
291ab06ecf
This patch adds the Ethernet over SPI driver for the Qualcomm QCA7000 HomePlug GreenPHY. Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: David S. Miller <davem@davemloft.net>
150 lines
3.4 KiB
C
150 lines
3.4 KiB
C
/*
|
|
*
|
|
* 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/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/spi/spi.h>
|
|
#include <linux/version.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;
|
|
}
|
|
|
|
int
|
|
qcaspi_tx_cmd(struct qcaspi *qca, u16 cmd)
|
|
{
|
|
__be16 tx_data;
|
|
struct spi_message *msg = &qca->spi_msg1;
|
|
struct spi_transfer *transfer = &qca->spi_xfer1;
|
|
int ret;
|
|
|
|
tx_data = cpu_to_be16(cmd);
|
|
transfer->len = sizeof(tx_data);
|
|
transfer->tx_buf = &tx_data;
|
|
transfer->rx_buf = NULL;
|
|
|
|
ret = spi_sync(qca->spi_dev, msg);
|
|
|
|
if (!ret)
|
|
ret = msg->status;
|
|
|
|
if (ret)
|
|
qcaspi_spi_error(qca);
|
|
|
|
return ret;
|
|
}
|