diff options
Diffstat (limited to 'drivers/net/ethernet/arc/emac_rockchip.c')
| -rw-r--r-- | drivers/net/ethernet/arc/emac_rockchip.c | 229 |
1 files changed, 229 insertions, 0 deletions
diff --git a/drivers/net/ethernet/arc/emac_rockchip.c b/drivers/net/ethernet/arc/emac_rockchip.c new file mode 100644 index 000000000000..c31c7407b753 --- /dev/null +++ b/drivers/net/ethernet/arc/emac_rockchip.c @@ -0,0 +1,229 @@ +/** + * 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; + + 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"); |