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/**
* emac-rockchip.c - Rockchip EMAC specific glue layer
*
* Copyright (C) 2014 Romain Perier <romain.perier@gmail.com>
*
* 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/etherdevice.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of_net.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include "emac.h"
#define DRV_NAME "rockchip_emac"
#define DRV_VERSION "1.0"
#define GRF_MODE_MII (1UL << 0)
#define GRF_MODE_RMII (0UL << 0)
#define GRF_SPEED_10M (0UL << 1)
#define GRF_SPEED_100M (1UL << 1)
#define GRF_SPEED_ENABLE_BIT (1UL << 17)
#define GRF_MODE_ENABLE_BIT (1UL << 16)
struct emac_rockchip_soc_data {
int grf_offset;
};
struct rockchip_priv_data {
struct arc_emac_priv emac;
struct regmap *grf;
const struct emac_rockchip_soc_data *soc_data;
struct regulator *regulator;
struct clk *refclk;
};
static void emac_rockchip_set_mac_speed(void *priv, unsigned int speed)
{
struct rockchip_priv_data *emac = priv;
u32 data;
int err = 0;
/* write-enable bits */
data = GRF_SPEED_ENABLE_BIT;
switch(speed) {
case 10:
data |= GRF_SPEED_10M;
break;
case 100:
data |= GRF_SPEED_100M;
break;
default:
pr_err("speed %u not supported\n", speed);
return;
}
err = regmap_write(emac->grf, emac->soc_data->grf_offset, data);
if (err)
pr_err("unable to apply speed %u to grf (%d)\n", speed, err);
}
static const struct emac_rockchip_soc_data emac_rockchip_dt_data[] = {
{ .grf_offset = 0x154 }, /* rk3066 */
{ .grf_offset = 0x0a4 }, /* rk3188 */
};
static const struct of_device_id emac_rockchip_dt_ids[] = {
{ .compatible = "rockchip,rk3066-emac", .data = &emac_rockchip_dt_data[0] },
{ .compatible = "rockchip,rk3188-emac", .data = &emac_rockchip_dt_data[1] },
{ /* Sentinel */ }
};
MODULE_DEVICE_TABLE(of, emac_rockchip_dt_ids);
static int emac_rockchip_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct net_device *ndev;
struct rockchip_priv_data *priv;
const struct of_device_id *match;
u32 data;
int err, interface;
if (!pdev->dev.of_node)
return -ENODEV;
ndev = alloc_etherdev(sizeof(struct rockchip_priv_data));
if (!ndev)
return -ENOMEM;
platform_set_drvdata(pdev, ndev);
SET_NETDEV_DEV(ndev, dev);
priv = netdev_priv(ndev);
priv->emac.drv_name = DRV_NAME;
priv->emac.drv_version = DRV_VERSION;
priv->emac.set_mac_speed = emac_rockchip_set_mac_speed;
interface = of_get_phy_mode(dev->of_node);
/* RK3066 and RK3188 SoCs only support RMII */
if (interface != PHY_INTERFACE_MODE_RMII) {
dev_err(dev, "unsupported phy interface mode %d\n", interface);
err = -ENOTSUPP;
goto out_netdev;
}
priv->grf = syscon_regmap_lookup_by_phandle(dev->of_node, "rockchip,grf");
if (IS_ERR(priv->grf)) {
dev_err(dev, "failed to retrieve global register file (%ld)\n", PTR_ERR(priv->grf));
err = PTR_ERR(priv->grf);
goto out_netdev;
}
match = of_match_node(emac_rockchip_dt_ids, dev->of_node);
priv->soc_data = match->data;
priv->emac.clk = devm_clk_get(dev, "hclk");
if (IS_ERR(priv->emac.clk)) {
dev_err(dev, "failed to retrieve host clock (%ld)\n", PTR_ERR(priv->emac.clk));
err = PTR_ERR(priv->emac.clk);
goto out_netdev;
}
priv->refclk = devm_clk_get(dev, "macref");
if (IS_ERR(priv->refclk)) {
dev_err(dev, "failed to retrieve reference clock (%ld)\n", PTR_ERR(priv->refclk));
err = PTR_ERR(priv->refclk);
goto out_netdev;
}
err = clk_prepare_enable(priv->refclk);
if (err) {
dev_err(dev, "failed to enable reference clock (%d)\n", err);
goto out_netdev;
}
/* Optional regulator for PHY */
priv->regulator = devm_regulator_get_optional(dev, "phy");
if (IS_ERR(priv->regulator)) {
if (PTR_ERR(priv->regulator) == -EPROBE_DEFER)
return -EPROBE_DEFER;
dev_err(dev, "no regulator found\n");
priv->regulator = NULL;
}
if (priv->regulator) {
err = regulator_enable(priv->regulator);
if (err) {
dev_err(dev, "failed to enable phy-supply (%d)\n", err);
goto out_clk_disable;
}
}
err = arc_emac_probe(ndev, interface);
if (err)
goto out_regulator_disable;
/* write-enable bits */
data = GRF_MODE_ENABLE_BIT | GRF_SPEED_ENABLE_BIT;
data |= GRF_SPEED_100M;
data |= GRF_MODE_RMII;
err = regmap_write(priv->grf, priv->soc_data->grf_offset, data);
if (err) {
dev_err(dev, "unable to apply initial settings to grf (%d)\n", err);
goto out_regulator_disable;
}
/* RMII interface needs always a rate of 50MHz */
err = clk_set_rate(priv->refclk, 50000000);
if (err)
dev_err(dev, "failed to change reference clock rate (%d)\n", err);
return 0;
out_regulator_disable:
if (priv->regulator)
regulator_disable(priv->regulator);
out_clk_disable:
clk_disable_unprepare(priv->refclk);
out_netdev:
free_netdev(ndev);
return err;
}
static int emac_rockchip_remove(struct platform_device *pdev)
{
struct net_device *ndev = platform_get_drvdata(pdev);
struct rockchip_priv_data *priv = netdev_priv(ndev);
int err;
clk_disable_unprepare(priv->refclk);
if (priv->regulator)
regulator_disable(priv->regulator);
err = arc_emac_remove(ndev);
free_netdev(ndev);
return err;
}
static struct platform_driver emac_rockchip_driver = {
.probe = emac_rockchip_probe,
.remove = emac_rockchip_remove,
.driver = {
.name = DRV_NAME,
.of_match_table = emac_rockchip_dt_ids,
},
};
module_platform_driver(emac_rockchip_driver);
MODULE_AUTHOR("Romain Perier <romain.perier@gmail.com>");
MODULE_DESCRIPTION("Rockchip EMAC platform driver");
MODULE_LICENSE("GPL");
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