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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) {
- err = -EPROBE_DEFER;
- goto out_clk_disable;
- }
- 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;
- err = arc_emac_remove(ndev);
- clk_disable_unprepare(priv->refclk);
- if (priv->regulator)
- regulator_disable(priv->regulator);
- 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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