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Commit 630cf097 authored by Akinobu Mita's avatar Akinobu Mita Committed by David S. Miller
Browse files

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: default avatarAkinobu Mita <akinobu.mita@gmail.com>
Cc: Mike Sinkovsky <msink@permonline.ru>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent bf2c6b90

drivers/net/ethernet/wiznet/Kconfig

+14 −0
Original line number Diff line number Diff line
@@ -69,4 +69,18 @@ config WIZNET_BUS_ANY 
	  Performance may decrease compared to explicitly selected bus mode.

endchoice



config WIZNET_W5100_SPI

	tristate "WIZnet W5100 Ethernet support for SPI mode"

	depends on WIZNET_BUS_ANY

	depends on SPI

	---help---

	  In SPI mode host system accesses registers using SPI protocol

	  (mode 0) on the SPI bus.



	  Performance decreases compared to other bus interface mode.

	  In W5100 SPI mode, burst READ/WRITE processing are not provided.



	  To compile this driver as a module, choose M here: the module

	  will be called w5100-spi.



endif # NET_VENDOR_WIZNET

drivers/net/ethernet/wiznet/Makefile

+1 −0
Original line number Diff line number Diff line 
obj-$(CONFIG_WIZNET_W5100) += w5100.o

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

obj-$(CONFIG_WIZNET_W5300) += w5300.o

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

0 → 100644
+136 −0
Original line number Diff line number Diff line 
/*

 * 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");