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https://github.com/edk2-porting/linux-next.git
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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
/*
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*
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* Copyright (c) 2011, 2012, Qualcomm 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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*/
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/* This module implements the Qualcomm Atheros SPI protocol for
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* kernel-based SPI device.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/spi/spi.h>
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#include <linux/version.h>
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#include "qca_7k.h"
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void
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qcaspi_spi_error(struct qcaspi *qca)
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{
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if (qca->sync != QCASPI_SYNC_READY)
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return;
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netdev_err(qca->net_dev, "spi error\n");
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qca->sync = QCASPI_SYNC_UNKNOWN;
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qca->stats.spi_err++;
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}
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int
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qcaspi_read_register(struct qcaspi *qca, u16 reg, u16 *result)
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{
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__be16 rx_data;
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__be16 tx_data;
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struct spi_transfer *transfer;
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struct spi_message *msg;
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int ret;
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tx_data = cpu_to_be16(QCA7K_SPI_READ | QCA7K_SPI_INTERNAL | reg);
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if (qca->legacy_mode) {
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msg = &qca->spi_msg1;
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transfer = &qca->spi_xfer1;
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transfer->tx_buf = &tx_data;
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transfer->rx_buf = NULL;
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transfer->len = QCASPI_CMD_LEN;
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spi_sync(qca->spi_dev, msg);
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} else {
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msg = &qca->spi_msg2;
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transfer = &qca->spi_xfer2[0];
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transfer->tx_buf = &tx_data;
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transfer->rx_buf = NULL;
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transfer->len = QCASPI_CMD_LEN;
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transfer = &qca->spi_xfer2[1];
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}
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transfer->tx_buf = NULL;
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transfer->rx_buf = &rx_data;
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transfer->len = QCASPI_CMD_LEN;
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ret = spi_sync(qca->spi_dev, msg);
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if (!ret)
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ret = msg->status;
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if (ret)
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qcaspi_spi_error(qca);
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else
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*result = be16_to_cpu(rx_data);
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return ret;
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}
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int
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qcaspi_write_register(struct qcaspi *qca, u16 reg, u16 value)
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{
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__be16 tx_data[2];
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struct spi_transfer *transfer;
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struct spi_message *msg;
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int ret;
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tx_data[0] = cpu_to_be16(QCA7K_SPI_WRITE | QCA7K_SPI_INTERNAL | reg);
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tx_data[1] = cpu_to_be16(value);
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if (qca->legacy_mode) {
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msg = &qca->spi_msg1;
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transfer = &qca->spi_xfer1;
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transfer->tx_buf = &tx_data[0];
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transfer->rx_buf = NULL;
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transfer->len = QCASPI_CMD_LEN;
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spi_sync(qca->spi_dev, msg);
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} else {
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msg = &qca->spi_msg2;
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transfer = &qca->spi_xfer2[0];
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transfer->tx_buf = &tx_data[0];
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transfer->rx_buf = NULL;
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transfer->len = QCASPI_CMD_LEN;
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transfer = &qca->spi_xfer2[1];
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}
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transfer->tx_buf = &tx_data[1];
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transfer->rx_buf = NULL;
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transfer->len = QCASPI_CMD_LEN;
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ret = spi_sync(qca->spi_dev, msg);
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if (!ret)
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ret = msg->status;
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if (ret)
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qcaspi_spi_error(qca);
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return ret;
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}
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int
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qcaspi_tx_cmd(struct qcaspi *qca, u16 cmd)
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{
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__be16 tx_data;
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struct spi_message *msg = &qca->spi_msg1;
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struct spi_transfer *transfer = &qca->spi_xfer1;
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int ret;
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tx_data = cpu_to_be16(cmd);
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transfer->len = sizeof(tx_data);
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transfer->tx_buf = &tx_data;
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transfer->rx_buf = NULL;
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ret = spi_sync(qca->spi_dev, msg);
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if (!ret)
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ret = msg->status;
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if (ret)
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qcaspi_spi_error(qca);
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return ret;
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}
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