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// SPDX-License-Identifier: GPL-2.0
/* DSA driver for:
* Vitesse VSC7385 SparX-G5 5+1-port Integrated Gigabit Ethernet Switch
* Vitesse VSC7388 SparX-G8 8-port Integrated Gigabit Ethernet Switch
* Vitesse VSC7395 SparX-G5e 5+1-port Integrated Gigabit Ethernet Switch
* Vitesse VSC7398 SparX-G8e 8-port Integrated Gigabit Ethernet Switch
*
* This driver takes control of the switch chip over SPI and
* configures it to route packages around when connected to a CPU port.
*
* Copyright (C) 2018 Linus Wallej <linus.walleij@linaro.org>
* Includes portions of code from the firmware uploader by:
* Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/spi/spi.h>
#include "vitesse-vsc73xx.h"
#define VSC73XX_CMD_SPI_MODE_READ 0
#define VSC73XX_CMD_SPI_MODE_WRITE 1
#define VSC73XX_CMD_SPI_MODE_SHIFT 4
#define VSC73XX_CMD_SPI_BLOCK_SHIFT 5
#define VSC73XX_CMD_SPI_BLOCK_MASK 0x7
#define VSC73XX_CMD_SPI_SUBBLOCK_MASK 0xf
/**
* struct vsc73xx_spi - VSC73xx SPI state container
*/
struct vsc73xx_spi {
struct spi_device *spi;
struct mutex lock; /* Protects SPI traffic */
struct vsc73xx vsc;
};
static const struct vsc73xx_ops vsc73xx_spi_ops;
static u8 vsc73xx_make_addr(u8 mode, u8 block, u8 subblock)
{
u8 ret;
ret =
(block & VSC73XX_CMD_SPI_BLOCK_MASK) << VSC73XX_CMD_SPI_BLOCK_SHIFT;
ret |= (mode & 1) << VSC73XX_CMD_SPI_MODE_SHIFT;
ret |= subblock & VSC73XX_CMD_SPI_SUBBLOCK_MASK;
return ret;
}
static int vsc73xx_spi_read(struct vsc73xx *vsc, u8 block, u8 subblock, u8 reg,
u32 *val)
{
struct vsc73xx_spi *vsc_spi = vsc->priv;
struct spi_transfer t[2];
struct spi_message m;
u8 cmd[4];
u8 buf[4];
int ret;
if (!vsc73xx_is_addr_valid(block, subblock))
return -EINVAL;
spi_message_init(&m);
memset(&t, 0, sizeof(t));
t[0].tx_buf = cmd;
t[0].len = sizeof(cmd);
spi_message_add_tail(&t[0], &m);
t[1].rx_buf = buf;
t[1].len = sizeof(buf);
spi_message_add_tail(&t[1], &m);
cmd[0] = vsc73xx_make_addr(VSC73XX_CMD_SPI_MODE_READ, block, subblock);
cmd[1] = reg;
cmd[2] = 0;
cmd[3] = 0;
mutex_lock(&vsc_spi->lock);
ret = spi_sync(vsc_spi->spi, &m);
mutex_unlock(&vsc_spi->lock);
if (ret)
return ret;
*val = (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
return 0;
}
static int vsc73xx_spi_write(struct vsc73xx *vsc, u8 block, u8 subblock, u8 reg,
u32 val)
{
struct vsc73xx_spi *vsc_spi = vsc->priv;
struct spi_transfer t[2];
struct spi_message m;
u8 cmd[2];
u8 buf[4];
int ret;
if (!vsc73xx_is_addr_valid(block, subblock))
return -EINVAL;
spi_message_init(&m);
memset(&t, 0, sizeof(t));
t[0].tx_buf = cmd;
t[0].len = sizeof(cmd);
spi_message_add_tail(&t[0], &m);
t[1].tx_buf = buf;
t[1].len = sizeof(buf);
spi_message_add_tail(&t[1], &m);
cmd[0] = vsc73xx_make_addr(VSC73XX_CMD_SPI_MODE_WRITE, block, subblock);
cmd[1] = reg;
buf[0] = (val >> 24) & 0xff;
buf[1] = (val >> 16) & 0xff;
buf[2] = (val >> 8) & 0xff;
buf[3] = val & 0xff;
mutex_lock(&vsc_spi->lock);
ret = spi_sync(vsc_spi->spi, &m);
mutex_unlock(&vsc_spi->lock);
return ret;
}
static int vsc73xx_spi_probe(struct spi_device *spi)
{
struct device *dev = &spi->dev;
struct vsc73xx_spi *vsc_spi;
int ret;
vsc_spi = devm_kzalloc(dev, sizeof(*vsc_spi), GFP_KERNEL);
if (!vsc_spi)
return -ENOMEM;
spi_set_drvdata(spi, vsc_spi);
vsc_spi->spi = spi_dev_get(spi);
vsc_spi->vsc.dev = dev;
vsc_spi->vsc.priv = vsc_spi;
vsc_spi->vsc.ops = &vsc73xx_spi_ops;
mutex_init(&vsc_spi->lock);
spi->mode = SPI_MODE_0;
spi->bits_per_word = 8;
ret = spi_setup(spi);
if (ret < 0) {
dev_err(dev, "spi setup failed.\n");
return ret;
}
return vsc73xx_probe(&vsc_spi->vsc);
}
static int vsc73xx_spi_remove(struct spi_device *spi)
{
struct vsc73xx_spi *vsc_spi = spi_get_drvdata(spi);
return vsc73xx_remove(&vsc_spi->vsc);
}
static const struct vsc73xx_ops vsc73xx_spi_ops = {
.read = vsc73xx_spi_read,
.write = vsc73xx_spi_write,
};
static const struct of_device_id vsc73xx_of_match[] = {
{
.compatible = "vitesse,vsc7385",
},
{
.compatible = "vitesse,vsc7388",
},
{
.compatible = "vitesse,vsc7395",
},
{
.compatible = "vitesse,vsc7398",
},
{ },
};
MODULE_DEVICE_TABLE(of, vsc73xx_of_match);
static struct spi_driver vsc73xx_spi_driver = {
.probe = vsc73xx_spi_probe,
.remove = vsc73xx_spi_remove,
.driver = {
.name = "vsc73xx-spi",
.of_match_table = vsc73xx_of_match,
},
};
module_spi_driver(vsc73xx_spi_driver);
MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
MODULE_DESCRIPTION("Vitesse VSC7385/7388/7395/7398 SPI driver");
MODULE_LICENSE("GPL v2");
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