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/*
* Ethernet driver for the WIZnet W5100 chip.
*
* Copyright (C) 2016 Akinobu Mita <akinobu.mita@gmail.com>
*
* Licensed under the GPL-2 or later.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/spi/spi.h>
#include "w5100.h"
#define W5100_SPI_WRITE_OPCODE 0xf0
#define W5100_SPI_READ_OPCODE 0x0f
static int w5100_spi_read(struct net_device *ndev, u16 addr)
{
struct spi_device *spi = to_spi_device(ndev->dev.parent);
u8 cmd[3] = { W5100_SPI_READ_OPCODE, addr >> 8, addr & 0xff };
u8 data;
int ret;
ret = spi_write_then_read(spi, cmd, sizeof(cmd), &data, 1);
return ret ? ret : data;
}
static int w5100_spi_write(struct net_device *ndev, u16 addr, u8 data)
{
struct spi_device *spi = to_spi_device(ndev->dev.parent);
u8 cmd[4] = { W5100_SPI_WRITE_OPCODE, addr >> 8, addr & 0xff, data};
return spi_write_then_read(spi, cmd, sizeof(cmd), NULL, 0);
}
static int w5100_spi_read16(struct net_device *ndev, u16 addr)
{
u16 data;
int ret;
ret = w5100_spi_read(ndev, addr);
if (ret < 0)
return ret;
data = ret << 8;
ret = w5100_spi_read(ndev, addr + 1);
return ret < 0 ? ret : data | ret;
}
static int w5100_spi_write16(struct net_device *ndev, u16 addr, u16 data)
{
int ret;
ret = w5100_spi_write(ndev, addr, data >> 8);
if (ret)
return ret;
return w5100_spi_write(ndev, addr + 1, data & 0xff);
}
static int w5100_spi_readbulk(struct net_device *ndev, u16 addr, u8 *buf,
int len)
{
int i;
for (i = 0; i < len; i++) {
int ret = w5100_spi_read(ndev, addr + i);
if (ret < 0)
return ret;
buf[i] = ret;
}
return 0;
}
static int w5100_spi_writebulk(struct net_device *ndev, u16 addr, const u8 *buf,
int len)
{
int i;
for (i = 0; i < len; i++) {
int ret = w5100_spi_write(ndev, addr + i, buf[i]);
if (ret)
return ret;
}
return 0;
}
static const struct w5100_ops w5100_spi_ops = {
.may_sleep = true,
.read = w5100_spi_read,
.write = w5100_spi_write,
.read16 = w5100_spi_read16,
.write16 = w5100_spi_write16,
.readbulk = w5100_spi_readbulk,
.writebulk = w5100_spi_writebulk,
};
static int w5100_spi_probe(struct spi_device *spi)
{
return w5100_probe(&spi->dev, &w5100_spi_ops, 0, NULL, spi->irq,
-EINVAL);
}
static int w5100_spi_remove(struct spi_device *spi)
{
return w5100_remove(&spi->dev);
}
static const struct spi_device_id w5100_spi_ids[] = {
{ "w5100", 0 },
{}
};
MODULE_DEVICE_TABLE(spi, w5100_spi_ids);
static struct spi_driver w5100_spi_driver = {
.driver = {
.name = "w5100",
.pm = &w5100_pm_ops,
},
.probe = w5100_spi_probe,
.remove = w5100_spi_remove,
.id_table = w5100_spi_ids,
};
module_spi_driver(w5100_spi_driver);
MODULE_DESCRIPTION("WIZnet W5100 Ethernet driver for SPI mode");
MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");
MODULE_LICENSE("GPL");
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