060e309a4d
According to MODULE_LICENSE the driver is under a dual license. So replace the BSD license text with the proper SPDX tag. Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Stefan Wahren <wahrenst@gmx.net> Reviewed-by: Jacob Keller <jacob.e.keller@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
135 lines
2.5 KiB
C
135 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
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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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/* 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/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/spi/spi.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[2];
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struct spi_message msg;
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int ret;
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memset(transfer, 0, sizeof(transfer));
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spi_message_init(&msg);
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tx_data = cpu_to_be16(QCA7K_SPI_READ | QCA7K_SPI_INTERNAL | reg);
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*result = 0;
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transfer[0].tx_buf = &tx_data;
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transfer[0].len = QCASPI_CMD_LEN;
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transfer[1].rx_buf = &rx_data;
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transfer[1].len = QCASPI_CMD_LEN;
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spi_message_add_tail(&transfer[0], &msg);
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if (qca->legacy_mode) {
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spi_sync(qca->spi_dev, &msg);
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spi_message_init(&msg);
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}
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spi_message_add_tail(&transfer[1], &msg);
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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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static 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[2];
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struct spi_message msg;
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int ret;
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memset(&transfer, 0, sizeof(transfer));
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spi_message_init(&msg);
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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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transfer[0].tx_buf = &tx_data[0];
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transfer[0].len = QCASPI_CMD_LEN;
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transfer[1].tx_buf = &tx_data[1];
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transfer[1].len = QCASPI_CMD_LEN;
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spi_message_add_tail(&transfer[0], &msg);
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if (qca->legacy_mode) {
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spi_sync(qca->spi_dev, &msg);
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spi_message_init(&msg);
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}
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spi_message_add_tail(&transfer[1], &msg);
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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_write_register(struct qcaspi *qca, u16 reg, u16 value, int retry)
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{
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int ret, i = 0;
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u16 confirmed;
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do {
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ret = __qcaspi_write_register(qca, reg, value);
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if (ret)
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return ret;
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if (!retry)
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return 0;
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ret = qcaspi_read_register(qca, reg, &confirmed);
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if (ret)
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return ret;
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ret = confirmed != value;
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if (!ret)
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return 0;
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i++;
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qca->stats.write_verify_failed++;
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} while (i <= retry);
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return ret;
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}
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