2 * dwmac-sunxi.c - Allwinner sunxi DWMAC specific glue layer
4 * Copyright (C) 2013 Chen-Yu Tsai
6 * Chen-Yu Tsai <wens@csie.org>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
19 #include <linux/stmmac.h>
20 #include <linux/clk.h>
21 #include <linux/phy.h>
22 #include <linux/of_net.h>
23 #include <linux/regulator/consumer.h>
25 #include "stmmac_platform.h"
27 struct sunxi_priv_data {
31 struct regulator *regulator;
34 static void *sun7i_gmac_setup(struct platform_device *pdev)
36 struct sunxi_priv_data *gmac;
37 struct device *dev = &pdev->dev;
39 gmac = devm_kzalloc(dev, sizeof(*gmac), GFP_KERNEL);
41 return ERR_PTR(-ENOMEM);
43 gmac->interface = of_get_phy_mode(dev->of_node);
45 gmac->tx_clk = devm_clk_get(dev, "allwinner_gmac_tx");
46 if (IS_ERR(gmac->tx_clk)) {
47 dev_err(dev, "could not get tx clock\n");
51 /* Optional regulator for PHY */
52 gmac->regulator = devm_regulator_get_optional(dev, "phy");
53 if (IS_ERR(gmac->regulator)) {
54 if (PTR_ERR(gmac->regulator) == -EPROBE_DEFER)
55 return ERR_PTR(-EPROBE_DEFER);
56 dev_info(dev, "no regulator found\n");
57 gmac->regulator = NULL;
63 #define SUN7I_GMAC_GMII_RGMII_RATE 125000000
64 #define SUN7I_GMAC_MII_RATE 25000000
66 static int sun7i_gmac_init(struct platform_device *pdev, void *priv)
68 struct sunxi_priv_data *gmac = priv;
71 if (gmac->regulator) {
72 ret = regulator_enable(gmac->regulator);
77 /* Set GMAC interface port mode
79 * The GMAC TX clock lines are configured by setting the clock
80 * rate, which then uses the auto-reparenting feature of the
81 * clock driver, and enabling/disabling the clock.
83 if (gmac->interface == PHY_INTERFACE_MODE_RGMII) {
84 clk_set_rate(gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE);
85 clk_prepare_enable(gmac->tx_clk);
86 gmac->clk_enabled = 1;
88 clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE);
89 clk_prepare(gmac->tx_clk);
95 static void sun7i_gmac_exit(struct platform_device *pdev, void *priv)
97 struct sunxi_priv_data *gmac = priv;
99 if (gmac->clk_enabled) {
100 clk_disable(gmac->tx_clk);
101 gmac->clk_enabled = 0;
103 clk_unprepare(gmac->tx_clk);
106 regulator_disable(gmac->regulator);
109 static void sun7i_fix_speed(void *priv, unsigned int speed)
111 struct sunxi_priv_data *gmac = priv;
113 /* only GMII mode requires us to reconfigure the clock lines */
114 if (gmac->interface != PHY_INTERFACE_MODE_GMII)
117 if (gmac->clk_enabled) {
118 clk_disable(gmac->tx_clk);
119 gmac->clk_enabled = 0;
121 clk_unprepare(gmac->tx_clk);
124 clk_set_rate(gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE);
125 clk_prepare_enable(gmac->tx_clk);
126 gmac->clk_enabled = 1;
128 clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE);
129 clk_prepare(gmac->tx_clk);
133 /* of_data specifying hardware features and callbacks.
134 * hardware features were copied from Allwinner drivers. */
135 const struct stmmac_of_data sun7i_gmac_data = {
138 .fix_mac_speed = sun7i_fix_speed,
139 .setup = sun7i_gmac_setup,
140 .init = sun7i_gmac_init,
141 .exit = sun7i_gmac_exit,