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/*
* DWMAC glue for NXP LPC18xx/LPC43xx Ethernet
*
* Copyright (C) 2015 Joachim Eastwood <manabian@gmail.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_net.h>
#include <linux/phy.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/stmmac.h>
#include "stmmac_platform.h"
/* Register defines for CREG syscon */
#define LPC18XX_CREG_CREG6 0x12c
# define LPC18XX_CREG_CREG6_ETHMODE_MASK 0x7
# define LPC18XX_CREG_CREG6_ETHMODE_MII 0x0
# define LPC18XX_CREG_CREG6_ETHMODE_RMII 0x4
struct lpc18xx_dwmac_priv_data {
struct regmap *reg;
int interface;
};
static void *lpc18xx_dwmac_setup(struct platform_device *pdev)
{
struct lpc18xx_dwmac_priv_data *dwmac;
dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
if (!dwmac)
return ERR_PTR(-ENOMEM);
dwmac->interface = of_get_phy_mode(pdev->dev.of_node);
if (dwmac->interface < 0)
return ERR_PTR(dwmac->interface);
dwmac->reg = syscon_regmap_lookup_by_compatible("nxp,lpc1850-creg");
if (IS_ERR(dwmac->reg)) {
dev_err(&pdev->dev, "Syscon lookup failed\n");
return dwmac->reg;
}
return dwmac;
}
static int lpc18xx_dwmac_init(struct platform_device *pdev, void *priv)
{
struct lpc18xx_dwmac_priv_data *dwmac = priv;
u8 ethmode;
if (dwmac->interface == PHY_INTERFACE_MODE_MII) {
ethmode = LPC18XX_CREG_CREG6_ETHMODE_MII;
} else if (dwmac->interface == PHY_INTERFACE_MODE_RMII) {
ethmode = LPC18XX_CREG_CREG6_ETHMODE_RMII;
} else {
dev_err(&pdev->dev, "Only MII and RMII mode supported\n");
return -EINVAL;
}
regmap_update_bits(dwmac->reg, LPC18XX_CREG_CREG6,
LPC18XX_CREG_CREG6_ETHMODE_MASK, ethmode);
return 0;
}
static const struct stmmac_of_data lpc18xx_dwmac_data = {
.has_gmac = 1,
.setup = lpc18xx_dwmac_setup,
.init = lpc18xx_dwmac_init,
};
static const struct of_device_id lpc18xx_dwmac_match[] = {
{ .compatible = "nxp,lpc1850-dwmac", .data = &lpc18xx_dwmac_data },
{ }
};
MODULE_DEVICE_TABLE(of, lpc18xx_dwmac_match);
static struct platform_driver lpc18xx_dwmac_driver = {
.probe = stmmac_pltfr_probe,
.remove = stmmac_pltfr_remove,
.driver = {
.name = "lpc18xx-dwmac",
.pm = &stmmac_pltfr_pm_ops,
.of_match_table = lpc18xx_dwmac_match,
},
};
module_platform_driver(lpc18xx_dwmac_driver);
MODULE_AUTHOR("Joachim Eastwood <manabian@gmail.com>");
MODULE_DESCRIPTION("DWMAC glue for LPC18xx/43xx Ethernet");
MODULE_LICENSE("GPL v2");
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