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net: w5100: support SPI interface mode
This adds new w5100-spi driver which shares the bus interface independent code with existing w5100 driver. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: Mike Sinkovsky <msink@permonline.ru> Cc: David S. Miller <davem@davemloft.net> Signed-off-by: David S. Miller <davem@davemloft.net>
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‎drivers/net/ethernet/wiznet/Kconfig

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@@ -69,4 +69,18 @@ config WIZNET_BUS_ANY
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Performance may decrease compared to explicitly selected bus mode.
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endchoice
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config WIZNET_W5100_SPI
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tristate "WIZnet W5100 Ethernet support for SPI mode"
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depends on WIZNET_BUS_ANY
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depends on SPI
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---help---
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In SPI mode host system accesses registers using SPI protocol
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(mode 0) on the SPI bus.
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Performance decreases compared to other bus interface mode.
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In W5100 SPI mode, burst READ/WRITE processing are not provided.
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To compile this driver as a module, choose M here: the module
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will be called w5100-spi.
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endif # NET_VENDOR_WIZNET

‎drivers/net/ethernet/wiznet/Makefile

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obj-$(CONFIG_WIZNET_W5100) += w5100.o
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obj-$(CONFIG_WIZNET_W5100_SPI) += w5100-spi.o
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obj-$(CONFIG_WIZNET_W5300) += w5300.o

‎drivers/net/ethernet/wiznet/w5100-spi.c

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

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