2 * emac-rockchip.c - Rockchip EMAC specific glue layer
4 * Copyright (C) 2014 Romain Perier <romain.perier@gmail.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
17 #include <linux/etherdevice.h>
18 #include <linux/mfd/syscon.h>
19 #include <linux/module.h>
20 #include <linux/of_net.h>
21 #include <linux/platform_device.h>
22 #include <linux/regmap.h>
23 #include <linux/regulator/consumer.h>
27 #define DRV_NAME "rockchip_emac"
28 #define DRV_VERSION "1.1"
30 struct emac_rockchip_soc_data {
31 unsigned int grf_offset;
32 unsigned int grf_mode_offset;
33 unsigned int grf_speed_offset;
37 struct rockchip_priv_data {
38 struct arc_emac_priv emac;
40 const struct emac_rockchip_soc_data *soc_data;
41 struct regulator *regulator;
46 static void emac_rockchip_set_mac_speed(void *priv, unsigned int speed)
48 struct rockchip_priv_data *emac = priv;
49 u32 speed_offset = emac->soc_data->grf_speed_offset;
55 data = (1 << (speed_offset + 16)) | (0 << speed_offset);
58 data = (1 << (speed_offset + 16)) | (1 << speed_offset);
61 pr_err("speed %u not supported\n", speed);
65 err = regmap_write(emac->grf, emac->soc_data->grf_offset, data);
67 pr_err("unable to apply speed %u to grf (%d)\n", speed, err);
70 static const struct emac_rockchip_soc_data emac_rk3036_emac_data = {
71 .grf_offset = 0x140, .grf_mode_offset = 8,
72 .grf_speed_offset = 9, .need_div_macclk = 1,
75 static const struct emac_rockchip_soc_data emac_rk3066_emac_data = {
76 .grf_offset = 0x154, .grf_mode_offset = 0,
77 .grf_speed_offset = 1, .need_div_macclk = 0,
80 static const struct emac_rockchip_soc_data emac_rk3188_emac_data = {
81 .grf_offset = 0x0a4, .grf_mode_offset = 0,
82 .grf_speed_offset = 1, .need_div_macclk = 0,
85 static const struct of_device_id emac_rockchip_dt_ids[] = {
86 { .compatible = "rockchip,rk3036-emac", .data = &emac_rk3036_emac_data },
87 { .compatible = "rockchip,rk3066-emac", .data = &emac_rk3066_emac_data },
88 { .compatible = "rockchip,rk3188-emac", .data = &emac_rk3188_emac_data },
92 MODULE_DEVICE_TABLE(of, emac_rockchip_dt_ids);
94 static int emac_rockchip_probe(struct platform_device *pdev)
96 struct device *dev = &pdev->dev;
97 struct net_device *ndev;
98 struct rockchip_priv_data *priv;
99 const struct of_device_id *match;
103 if (!pdev->dev.of_node)
106 ndev = alloc_etherdev(sizeof(struct rockchip_priv_data));
109 platform_set_drvdata(pdev, ndev);
110 SET_NETDEV_DEV(ndev, dev);
112 priv = netdev_priv(ndev);
113 priv->emac.drv_name = DRV_NAME;
114 priv->emac.drv_version = DRV_VERSION;
115 priv->emac.set_mac_speed = emac_rockchip_set_mac_speed;
117 interface = of_get_phy_mode(dev->of_node);
119 /* RK3036/RK3066/RK3188 SoCs only support RMII */
120 if (interface != PHY_INTERFACE_MODE_RMII) {
121 dev_err(dev, "unsupported phy interface mode %d\n", interface);
126 priv->grf = syscon_regmap_lookup_by_phandle(dev->of_node, "rockchip,grf");
127 if (IS_ERR(priv->grf)) {
128 dev_err(dev, "failed to retrieve global register file (%ld)\n", PTR_ERR(priv->grf));
129 err = PTR_ERR(priv->grf);
133 match = of_match_node(emac_rockchip_dt_ids, dev->of_node);
134 priv->soc_data = match->data;
136 priv->emac.clk = devm_clk_get(dev, "hclk");
137 if (IS_ERR(priv->emac.clk)) {
138 dev_err(dev, "failed to retrieve host clock (%ld)\n", PTR_ERR(priv->emac.clk));
139 err = PTR_ERR(priv->emac.clk);
143 priv->refclk = devm_clk_get(dev, "macref");
144 if (IS_ERR(priv->refclk)) {
145 dev_err(dev, "failed to retrieve reference clock (%ld)\n", PTR_ERR(priv->refclk));
146 err = PTR_ERR(priv->refclk);
150 err = clk_prepare_enable(priv->refclk);
152 dev_err(dev, "failed to enable reference clock (%d)\n", err);
156 /* Optional regulator for PHY */
157 priv->regulator = devm_regulator_get_optional(dev, "phy");
158 if (IS_ERR(priv->regulator)) {
159 if (PTR_ERR(priv->regulator) == -EPROBE_DEFER)
160 return -EPROBE_DEFER;
161 dev_err(dev, "no regulator found\n");
162 priv->regulator = NULL;
165 if (priv->regulator) {
166 err = regulator_enable(priv->regulator);
168 dev_err(dev, "failed to enable phy-supply (%d)\n", err);
169 goto out_clk_disable;
174 data = (1 << (priv->soc_data->grf_speed_offset + 16)) |
175 (1 << priv->soc_data->grf_speed_offset);
177 data |= (1 << (priv->soc_data->grf_mode_offset + 16)) |
178 (0 << priv->soc_data->grf_mode_offset);
180 err = regmap_write(priv->grf, priv->soc_data->grf_offset, data);
182 dev_err(dev, "unable to apply initial settings to grf (%d)\n", err);
183 goto out_regulator_disable;
186 /* RMII interface needs always a rate of 50MHz */
187 err = clk_set_rate(priv->refclk, 50000000);
189 dev_err(dev, "failed to change reference clock rate (%d)\n", err);
191 if (priv->soc_data->need_div_macclk) {
192 priv->macclk = devm_clk_get(dev, "macclk");
193 if (IS_ERR(priv->macclk)) {
194 dev_err(dev, "failed to retrieve mac clock (%ld)\n", PTR_ERR(priv->macclk));
195 err = PTR_ERR(priv->macclk);
196 goto out_regulator_disable;
199 err = clk_prepare_enable(priv->macclk);
201 dev_err(dev, "failed to enable mac clock (%d)\n", err);
202 goto out_regulator_disable;
205 /* RMII TX/RX needs always a rate of 25MHz */
206 err = clk_set_rate(priv->macclk, 25000000);
208 dev_err(dev, "failed to change mac clock rate (%d)\n", err);
211 err = arc_emac_probe(ndev, interface);
213 dev_err(dev, "failed to probe arc emac (%d)\n", err);
214 goto out_regulator_disable;
219 out_regulator_disable:
221 regulator_disable(priv->regulator);
223 clk_disable_unprepare(priv->refclk);
229 static int emac_rockchip_remove(struct platform_device *pdev)
231 struct net_device *ndev = platform_get_drvdata(pdev);
232 struct rockchip_priv_data *priv = netdev_priv(ndev);
235 err = arc_emac_remove(ndev);
237 clk_disable_unprepare(priv->refclk);
240 regulator_disable(priv->regulator);
246 static struct platform_driver emac_rockchip_driver = {
247 .probe = emac_rockchip_probe,
248 .remove = emac_rockchip_remove,
251 .of_match_table = emac_rockchip_dt_ids,
255 module_platform_driver(emac_rockchip_driver);
257 MODULE_AUTHOR("Romain Perier <romain.perier@gmail.com>");
258 MODULE_DESCRIPTION("Rockchip EMAC platform driver");
259 MODULE_LICENSE("GPL");