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/*
* dwmac-sunxi.c - Allwinner sunxi DWMAC specific glue layer
*
* Copyright (C) 2013 Chen-Yu Tsai
*
* Chen-Yu Tsai <wens@csie.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/stmmac.h>
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/phy.h>
#include <linux/platform_device.h>
#include <linux/of_net.h>
#include <linux/regulator/consumer.h>
#include "stmmac_platform.h"
struct sunxi_priv_data {
int interface;
int clk_enabled;
struct clk *tx_clk;
struct regulator *regulator;
};
static void *sun7i_gmac_setup(struct platform_device *pdev)
{
struct sunxi_priv_data *gmac;
struct device *dev = &pdev->dev;
gmac = devm_kzalloc(dev, sizeof(*gmac), GFP_KERNEL);
if (!gmac)
return ERR_PTR(-ENOMEM);
gmac->interface = of_get_phy_mode(dev->of_node);
gmac->tx_clk = devm_clk_get(dev, "allwinner_gmac_tx");
if (IS_ERR(gmac->tx_clk)) {
dev_err(dev, "could not get tx clock\n");
return gmac->tx_clk;
}
/* Optional regulator for PHY */
gmac->regulator = devm_regulator_get_optional(dev, "phy");
if (IS_ERR(gmac->regulator)) {
if (PTR_ERR(gmac->regulator) == -EPROBE_DEFER)
return ERR_PTR(-EPROBE_DEFER);
dev_info(dev, "no regulator found\n");
gmac->regulator = NULL;
}
return gmac;
}
#define SUN7I_GMAC_GMII_RGMII_RATE 125000000
#define SUN7I_GMAC_MII_RATE 25000000
static int sun7i_gmac_init(struct platform_device *pdev, void *priv)
{
struct sunxi_priv_data *gmac = priv;
int ret;
if (gmac->regulator) {
ret = regulator_enable(gmac->regulator);
if (ret)
return ret;
}
/* Set GMAC interface port mode
*
* The GMAC TX clock lines are configured by setting the clock
* rate, which then uses the auto-reparenting feature of the
* clock driver, and enabling/disabling the clock.
*/
if (gmac->interface == PHY_INTERFACE_MODE_RGMII) {
clk_set_rate(gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE);
clk_prepare_enable(gmac->tx_clk);
gmac->clk_enabled = 1;
} else {
clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE);
clk_prepare(gmac->tx_clk);
}
return 0;
}
static void sun7i_gmac_exit(struct platform_device *pdev, void *priv)
{
struct sunxi_priv_data *gmac = priv;
if (gmac->clk_enabled) {
clk_disable(gmac->tx_clk);
gmac->clk_enabled = 0;
}
clk_unprepare(gmac->tx_clk);
if (gmac->regulator)
regulator_disable(gmac->regulator);
}
static void sun7i_fix_speed(void *priv, unsigned int speed)
{
struct sunxi_priv_data *gmac = priv;
/* only GMII mode requires us to reconfigure the clock lines */
if (gmac->interface != PHY_INTERFACE_MODE_GMII)
return;
if (gmac->clk_enabled) {
clk_disable(gmac->tx_clk);
gmac->clk_enabled = 0;
}
clk_unprepare(gmac->tx_clk);
if (speed == 1000) {
clk_set_rate(gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE);
clk_prepare_enable(gmac->tx_clk);
gmac->clk_enabled = 1;
} else {
clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE);
clk_prepare(gmac->tx_clk);
}
}
/* of_data specifying hardware features and callbacks.
* hardware features were copied from Allwinner drivers. */
static const struct stmmac_of_data sun7i_gmac_data = {
.has_gmac = 1,
.tx_coe = 1,
.fix_mac_speed = sun7i_fix_speed,
.setup = sun7i_gmac_setup,
.init = sun7i_gmac_init,
.exit = sun7i_gmac_exit,
};
static const struct of_device_id sun7i_dwmac_match[] = {
{ .compatible = "allwinner,sun7i-a20-gmac", .data = &sun7i_gmac_data},
{ }
};
MODULE_DEVICE_TABLE(of, sun7i_dwmac_match);
static struct platform_driver sun7i_dwmac_driver = {
.probe = stmmac_pltfr_probe,
.remove = stmmac_pltfr_remove,
.driver = {
.name = "sun7i-dwmac",
.pm = &stmmac_pltfr_pm_ops,
.of_match_table = sun7i_dwmac_match,
},
};
module_platform_driver(sun7i_dwmac_driver);
MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>");
MODULE_DESCRIPTION("Allwinner sunxi DWMAC specific glue layer");
MODULE_LICENSE("GPL");
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