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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 connected over CPU-attached
* address bus and configures it to route packages around when connected to
* a CPU port.
*
* Copyright (C) 2019 Pawel Dembicki <paweldembicki@gmail.com>
* Based on vitesse-vsc-spi.c by:
* 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/platform_device.h>
#include "vitesse-vsc73xx.h"
#define VSC73XX_CMD_PLATFORM_BLOCK_SHIFT 14
#define VSC73XX_CMD_PLATFORM_BLOCK_MASK 0x7
#define VSC73XX_CMD_PLATFORM_SUBBLOCK_SHIFT 10
#define VSC73XX_CMD_PLATFORM_SUBBLOCK_MASK 0xf
#define VSC73XX_CMD_PLATFORM_REGISTER_SHIFT 2
/**
* struct vsc73xx_platform - VSC73xx Platform state container
*/
struct vsc73xx_platform {
struct platform_device *pdev;
void __iomem *base_addr;
struct vsc73xx vsc;
};
static const struct vsc73xx_ops vsc73xx_platform_ops;
static u32 vsc73xx_make_addr(u8 block, u8 subblock, u8 reg)
{
u32 ret;
ret = (block & VSC73XX_CMD_PLATFORM_BLOCK_MASK)
<< VSC73XX_CMD_PLATFORM_BLOCK_SHIFT;
ret |= (subblock & VSC73XX_CMD_PLATFORM_SUBBLOCK_MASK)
<< VSC73XX_CMD_PLATFORM_SUBBLOCK_SHIFT;
ret |= reg << VSC73XX_CMD_PLATFORM_REGISTER_SHIFT;
return ret;
}
static int vsc73xx_platform_read(struct vsc73xx *vsc, u8 block, u8 subblock,
u8 reg, u32 *val)
{
struct vsc73xx_platform *vsc_platform = vsc->priv;
u32 offset;
if (!vsc73xx_is_addr_valid(block, subblock))
return -EINVAL;
offset = vsc73xx_make_addr(block, subblock, reg);
/* By default vsc73xx running in big-endian mode.
* (See "Register Addressing" section 5.5.3 in the VSC7385 manual.)
*/
*val = ioread32be(vsc_platform->base_addr + offset);
return 0;
}
static int vsc73xx_platform_write(struct vsc73xx *vsc, u8 block, u8 subblock,
u8 reg, u32 val)
{
struct vsc73xx_platform *vsc_platform = vsc->priv;
u32 offset;
if (!vsc73xx_is_addr_valid(block, subblock))
return -EINVAL;
offset = vsc73xx_make_addr(block, subblock, reg);
iowrite32be(val, vsc_platform->base_addr + offset);
return 0;
}
static int vsc73xx_platform_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct vsc73xx_platform *vsc_platform;
struct resource *res = NULL;
int ret;
vsc_platform = devm_kzalloc(dev, sizeof(*vsc_platform), GFP_KERNEL);
if (!vsc_platform)
return -ENOMEM;
platform_set_drvdata(pdev, vsc_platform);
vsc_platform->pdev = pdev;
vsc_platform->vsc.dev = dev;
vsc_platform->vsc.priv = vsc_platform;
vsc_platform->vsc.ops = &vsc73xx_platform_ops;
/* obtain I/O memory space */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "cannot obtain I/O memory space\n");
ret = -ENXIO;
return ret;
}
vsc_platform->base_addr = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(vsc_platform->base_addr)) {
dev_err(&pdev->dev, "cannot request I/O memory space\n");
ret = -ENXIO;
return ret;
}
return vsc73xx_probe(&vsc_platform->vsc);
}
static int vsc73xx_platform_remove(struct platform_device *pdev)
{
struct vsc73xx_platform *vsc_platform = platform_get_drvdata(pdev);
return vsc73xx_remove(&vsc_platform->vsc);
}
static const struct vsc73xx_ops vsc73xx_platform_ops = {
.read = vsc73xx_platform_read,
.write = vsc73xx_platform_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 platform_driver vsc73xx_platform_driver = {
.probe = vsc73xx_platform_probe,
.remove = vsc73xx_platform_remove,
.driver = {
.name = "vsc73xx-platform",
.of_match_table = vsc73xx_of_match,
},
};
module_platform_driver(vsc73xx_platform_driver);
MODULE_AUTHOR("Pawel Dembicki <paweldembicki@gmail.com>");
MODULE_DESCRIPTION("Vitesse VSC7385/7388/7395/7398 Platform driver");
MODULE_LICENSE("GPL v2");
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