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[] = {
87 .compatible = "rockchip,rk3036-emac",
88 .data = &emac_rk3036_emac_data,
91 .compatible = "rockchip,rk3066-emac",
92 .data = &emac_rk3066_emac_data,
95 .compatible = "rockchip,rk3188-emac",
96 .data = &emac_rk3188_emac_data,
101 MODULE_DEVICE_TABLE(of, emac_rockchip_dt_ids);
103 static int emac_rockchip_probe(struct platform_device *pdev)
105 struct device *dev = &pdev->dev;
106 struct net_device *ndev;
107 struct rockchip_priv_data *priv;
108 const struct of_device_id *match;
112 if (!pdev->dev.of_node)
115 ndev = alloc_etherdev(sizeof(struct rockchip_priv_data));
118 platform_set_drvdata(pdev, ndev);
119 SET_NETDEV_DEV(ndev, dev);
121 priv = netdev_priv(ndev);
122 priv->emac.drv_name = DRV_NAME;
123 priv->emac.drv_version = DRV_VERSION;
124 priv->emac.set_mac_speed = emac_rockchip_set_mac_speed;
126 interface = of_get_phy_mode(dev->of_node);
128 /* RK3036/RK3066/RK3188 SoCs only support RMII */
129 if (interface != PHY_INTERFACE_MODE_RMII) {
130 dev_err(dev, "unsupported phy interface mode %d\n", interface);
135 priv->grf = syscon_regmap_lookup_by_phandle(dev->of_node,
137 if (IS_ERR(priv->grf)) {
138 dev_err(dev, "failed to retrieve global register file (%ld)\n",
140 err = PTR_ERR(priv->grf);
144 match = of_match_node(emac_rockchip_dt_ids, dev->of_node);
145 priv->soc_data = match->data;
147 priv->emac.clk = devm_clk_get(dev, "hclk");
148 if (IS_ERR(priv->emac.clk)) {
149 dev_err(dev, "failed to retrieve host clock (%ld)\n",
150 PTR_ERR(priv->emac.clk));
151 err = PTR_ERR(priv->emac.clk);
155 priv->refclk = devm_clk_get(dev, "macref");
156 if (IS_ERR(priv->refclk)) {
157 dev_err(dev, "failed to retrieve reference clock (%ld)\n",
158 PTR_ERR(priv->refclk));
159 err = PTR_ERR(priv->refclk);
163 err = clk_prepare_enable(priv->refclk);
165 dev_err(dev, "failed to enable reference clock (%d)\n", err);
169 /* Optional regulator for PHY */
170 priv->regulator = devm_regulator_get_optional(dev, "phy");
171 if (IS_ERR(priv->regulator)) {
172 if (PTR_ERR(priv->regulator) == -EPROBE_DEFER) {
174 goto out_clk_disable;
176 dev_err(dev, "no regulator found\n");
177 priv->regulator = NULL;
180 if (priv->regulator) {
181 err = regulator_enable(priv->regulator);
183 dev_err(dev, "failed to enable phy-supply (%d)\n", err);
184 goto out_clk_disable;
189 data = (1 << (priv->soc_data->grf_speed_offset + 16)) |
190 (1 << priv->soc_data->grf_speed_offset);
192 data |= (1 << (priv->soc_data->grf_mode_offset + 16)) |
193 (0 << priv->soc_data->grf_mode_offset);
195 err = regmap_write(priv->grf, priv->soc_data->grf_offset, data);
197 dev_err(dev, "unable to apply initial settings to grf (%d)\n",
199 goto out_regulator_disable;
202 /* RMII interface needs always a rate of 50MHz */
203 err = clk_set_rate(priv->refclk, 50000000);
206 "failed to change reference clock rate (%d)\n", err);
207 goto out_regulator_disable;
210 if (priv->soc_data->need_div_macclk) {
211 priv->macclk = devm_clk_get(dev, "macclk");
212 if (IS_ERR(priv->macclk)) {
213 dev_err(dev, "failed to retrieve mac clock (%ld)\n",
214 PTR_ERR(priv->macclk));
215 err = PTR_ERR(priv->macclk);
216 goto out_regulator_disable;
219 err = clk_prepare_enable(priv->macclk);
221 dev_err(dev, "failed to enable mac clock (%d)\n", err);
222 goto out_regulator_disable;
225 /* RMII TX/RX needs always a rate of 25MHz */
226 err = clk_set_rate(priv->macclk, 25000000);
229 "failed to change mac clock rate (%d)\n", err);
230 goto out_clk_disable_macclk;
234 err = arc_emac_probe(ndev, interface);
236 dev_err(dev, "failed to probe arc emac (%d)\n", err);
237 goto out_clk_disable_macclk;
242 out_clk_disable_macclk:
243 if (priv->soc_data->need_div_macclk)
244 clk_disable_unprepare(priv->macclk);
245 out_regulator_disable:
247 regulator_disable(priv->regulator);
249 clk_disable_unprepare(priv->refclk);
255 static int emac_rockchip_remove(struct platform_device *pdev)
257 struct net_device *ndev = platform_get_drvdata(pdev);
258 struct rockchip_priv_data *priv = netdev_priv(ndev);
261 err = arc_emac_remove(ndev);
263 clk_disable_unprepare(priv->refclk);
266 regulator_disable(priv->regulator);
272 static struct platform_driver emac_rockchip_driver = {
273 .probe = emac_rockchip_probe,
274 .remove = emac_rockchip_remove,
277 .of_match_table = emac_rockchip_dt_ids,
281 module_platform_driver(emac_rockchip_driver);
283 MODULE_AUTHOR("Romain Perier <romain.perier@gmail.com>");
284 MODULE_DESCRIPTION("Rockchip EMAC platform driver");
285 MODULE_LICENSE("GPL");