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/* Texas Instruments Ethernet Switch Driver
*
* Copyright (C) 2013 Texas Instruments
*
* Module Author: Mugunthan V N <mugunthanvnm@ti.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/platform_device.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/phy.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include "cpsw.h"
/* AM33xx SoC specific definitions for the CONTROL port */
#define AM33XX_GMII_SEL_MODE_MII 0
#define AM33XX_GMII_SEL_MODE_RMII 1
#define AM33XX_GMII_SEL_MODE_RGMII 2
#define AM33XX_GMII_SEL_RMII2_IO_CLK_EN BIT(7)
#define AM33XX_GMII_SEL_RMII1_IO_CLK_EN BIT(6)
#define AM33XX_GMII_SEL_RGMII2_IDMODE BIT(5)
#define AM33XX_GMII_SEL_RGMII1_IDMODE BIT(4)
#define GMII_SEL_MODE_MASK 0x3
struct cpsw_phy_sel_priv {
struct device *dev;
u32 __iomem *gmii_sel;
bool rmii_clock_external;
void (*cpsw_phy_sel)(struct cpsw_phy_sel_priv *priv,
phy_interface_t phy_mode, int slave);
};
static void cpsw_gmii_sel_am3352(struct cpsw_phy_sel_priv *priv,
phy_interface_t phy_mode, int slave)
{
u32 reg;
u32 mask;
u32 mode = 0;
bool rgmii_id = false;
reg = readl(priv->gmii_sel);
switch (phy_mode) {
case PHY_INTERFACE_MODE_RMII:
mode = AM33XX_GMII_SEL_MODE_RMII;
break;
case PHY_INTERFACE_MODE_RGMII:
mode = AM33XX_GMII_SEL_MODE_RGMII;
break;
case PHY_INTERFACE_MODE_RGMII_ID:
case PHY_INTERFACE_MODE_RGMII_RXID:
case PHY_INTERFACE_MODE_RGMII_TXID:
mode = AM33XX_GMII_SEL_MODE_RGMII;
rgmii_id = true;
break;
default:
dev_warn(priv->dev,
"Unsupported PHY mode: \"%s\". Defaulting to MII.\n",
phy_modes(phy_mode));
/* fallthrough */
case PHY_INTERFACE_MODE_MII:
mode = AM33XX_GMII_SEL_MODE_MII;
break;
};
mask = GMII_SEL_MODE_MASK << (slave * 2) | BIT(slave + 6);
mask |= BIT(slave + 4);
mode <<= slave * 2;
if (priv->rmii_clock_external) {
if (slave == 0)
mode |= AM33XX_GMII_SEL_RMII1_IO_CLK_EN;
else
mode |= AM33XX_GMII_SEL_RMII2_IO_CLK_EN;
}
if (rgmii_id) {
if (slave == 0)
mode |= AM33XX_GMII_SEL_RGMII1_IDMODE;
else
mode |= AM33XX_GMII_SEL_RGMII2_IDMODE;
}
reg &= ~mask;
reg |= mode;
writel(reg, priv->gmii_sel);
}
static void cpsw_gmii_sel_dra7xx(struct cpsw_phy_sel_priv *priv,
phy_interface_t phy_mode, int slave)
{
u32 reg;
u32 mask;
u32 mode = 0;
reg = readl(priv->gmii_sel);
switch (phy_mode) {
case PHY_INTERFACE_MODE_RMII:
mode = AM33XX_GMII_SEL_MODE_RMII;
break;
case PHY_INTERFACE_MODE_RGMII:
case PHY_INTERFACE_MODE_RGMII_ID:
case PHY_INTERFACE_MODE_RGMII_RXID:
case PHY_INTERFACE_MODE_RGMII_TXID:
mode = AM33XX_GMII_SEL_MODE_RGMII;
break;
default:
dev_warn(priv->dev,
"Unsupported PHY mode: \"%s\". Defaulting to MII.\n",
phy_modes(phy_mode));
/* fallthrough */
case PHY_INTERFACE_MODE_MII:
mode = AM33XX_GMII_SEL_MODE_MII;
break;
};
switch (slave) {
case 0:
mask = GMII_SEL_MODE_MASK;
break;
case 1:
mask = GMII_SEL_MODE_MASK << 4;
mode <<= 4;
break;
default:
dev_err(priv->dev, "invalid slave number...\n");
return;
}
if (priv->rmii_clock_external)
dev_err(priv->dev, "RMII External clock is not supported\n");
reg &= ~mask;
reg |= mode;
writel(reg, priv->gmii_sel);
}
static struct platform_driver cpsw_phy_sel_driver;
static int match(struct device *dev, void *data)
{
struct device_node *node = (struct device_node *)data;
return dev->of_node == node &&
dev->driver == &cpsw_phy_sel_driver.driver;
}
void cpsw_phy_sel(struct device *dev, phy_interface_t phy_mode, int slave)
{
struct device_node *node;
struct cpsw_phy_sel_priv *priv;
node = of_get_child_by_name(dev->of_node, "cpsw-phy-sel");
if (!node) {
dev_err(dev, "Phy mode driver DT not found\n");
return;
}
dev = bus_find_device(&platform_bus_type, NULL, node, match);
if (!dev) {
dev_err(dev, "unable to find platform device for %pOF\n", node);
goto out;
}
priv = dev_get_drvdata(dev);
priv->cpsw_phy_sel(priv, phy_mode, slave);
put_device(dev);
out:
of_node_put(node);
}
EXPORT_SYMBOL_GPL(cpsw_phy_sel);
static const struct of_device_id cpsw_phy_sel_id_table[] = {
{
.compatible = "ti,am3352-cpsw-phy-sel",
.data = &cpsw_gmii_sel_am3352,
},
{
.compatible = "ti,dra7xx-cpsw-phy-sel",
.data = &cpsw_gmii_sel_dra7xx,
},
{
.compatible = "ti,am43xx-cpsw-phy-sel",
.data = &cpsw_gmii_sel_am3352,
},
{}
};
static int cpsw_phy_sel_probe(struct platform_device *pdev)
{
struct resource *res;
const struct of_device_id *of_id;
struct cpsw_phy_sel_priv *priv;
of_id = of_match_node(cpsw_phy_sel_id_table, pdev->dev.of_node);
if (!of_id)
return -EINVAL;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv) {
dev_err(&pdev->dev, "unable to alloc memory for cpsw phy sel\n");
return -ENOMEM;
}
priv->dev = &pdev->dev;
priv->cpsw_phy_sel = of_id->data;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "gmii-sel");
priv->gmii_sel = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(priv->gmii_sel))
return PTR_ERR(priv->gmii_sel);
if (of_find_property(pdev->dev.of_node, "rmii-clock-ext", NULL))
priv->rmii_clock_external = true;
dev_set_drvdata(&pdev->dev, priv);
return 0;
}
static struct platform_driver cpsw_phy_sel_driver = {
.probe = cpsw_phy_sel_probe,
.driver = {
.name = "cpsw-phy-sel",
.of_match_table = cpsw_phy_sel_id_table,
},
};
builtin_platform_driver(cpsw_phy_sel_driver);
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