1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * dwmac-sunxi.c - Allwinner sunxi DWMAC specific glue layer
4 *
5 * Copyright (C) 2013 Chen-Yu Tsai
6 *
7 * Chen-Yu Tsai <wens@csie.org>
8 */
9
10 #include <linux/stmmac.h>
11 #include <linux/clk.h>
12 #include <linux/module.h>
13 #include <linux/phy.h>
14 #include <linux/platform_device.h>
15 #include <linux/of_net.h>
16 #include <linux/regulator/consumer.h>
17
18 #include "stmmac_platform.h"
19
20 struct sunxi_priv_data {
21 phy_interface_t interface;
22 int clk_enabled;
23 struct clk *tx_clk;
24 struct regulator *regulator;
25 };
26
27 #define SUN7I_GMAC_GMII_RGMII_RATE 125000000
28 #define SUN7I_GMAC_MII_RATE 25000000
29
sun7i_gmac_init(struct platform_device * pdev,void * priv)30 static int sun7i_gmac_init(struct platform_device *pdev, void *priv)
31 {
32 struct sunxi_priv_data *gmac = priv;
33 int ret = 0;
34
35 if (gmac->regulator) {
36 ret = regulator_enable(gmac->regulator);
37 if (ret)
38 return ret;
39 }
40
41 /* Set GMAC interface port mode
42 *
43 * The GMAC TX clock lines are configured by setting the clock
44 * rate, which then uses the auto-reparenting feature of the
45 * clock driver, and enabling/disabling the clock.
46 */
47 if (phy_interface_mode_is_rgmii(gmac->interface)) {
48 clk_set_rate(gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE);
49 clk_prepare_enable(gmac->tx_clk);
50 gmac->clk_enabled = 1;
51 } else {
52 clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE);
53 ret = clk_prepare(gmac->tx_clk);
54 if (ret && gmac->regulator)
55 regulator_disable(gmac->regulator);
56 }
57
58 return ret;
59 }
60
sun7i_gmac_exit(struct platform_device * pdev,void * priv)61 static void sun7i_gmac_exit(struct platform_device *pdev, void *priv)
62 {
63 struct sunxi_priv_data *gmac = priv;
64
65 if (gmac->clk_enabled) {
66 clk_disable(gmac->tx_clk);
67 gmac->clk_enabled = 0;
68 }
69 clk_unprepare(gmac->tx_clk);
70
71 if (gmac->regulator)
72 regulator_disable(gmac->regulator);
73 }
74
sun7i_fix_speed(void * priv,unsigned int speed,unsigned int mode)75 static void sun7i_fix_speed(void *priv, unsigned int speed, unsigned int mode)
76 {
77 struct sunxi_priv_data *gmac = priv;
78
79 /* only GMII mode requires us to reconfigure the clock lines */
80 if (gmac->interface != PHY_INTERFACE_MODE_GMII)
81 return;
82
83 if (gmac->clk_enabled) {
84 clk_disable(gmac->tx_clk);
85 gmac->clk_enabled = 0;
86 }
87 clk_unprepare(gmac->tx_clk);
88
89 if (speed == 1000) {
90 clk_set_rate(gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE);
91 clk_prepare_enable(gmac->tx_clk);
92 gmac->clk_enabled = 1;
93 } else {
94 clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE);
95 clk_prepare(gmac->tx_clk);
96 }
97 }
98
sun7i_gmac_probe(struct platform_device * pdev)99 static int sun7i_gmac_probe(struct platform_device *pdev)
100 {
101 struct plat_stmmacenet_data *plat_dat;
102 struct stmmac_resources stmmac_res;
103 struct sunxi_priv_data *gmac;
104 struct device *dev = &pdev->dev;
105 int ret;
106
107 ret = stmmac_get_platform_resources(pdev, &stmmac_res);
108 if (ret)
109 return ret;
110
111 plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
112 if (IS_ERR(plat_dat))
113 return PTR_ERR(plat_dat);
114
115 gmac = devm_kzalloc(dev, sizeof(*gmac), GFP_KERNEL);
116 if (!gmac) {
117 ret = -ENOMEM;
118 goto err_remove_config_dt;
119 }
120
121 ret = of_get_phy_mode(dev->of_node, &gmac->interface);
122 if (ret && ret != -ENODEV) {
123 dev_err(dev, "Can't get phy-mode\n");
124 goto err_remove_config_dt;
125 }
126
127 gmac->tx_clk = devm_clk_get(dev, "allwinner_gmac_tx");
128 if (IS_ERR(gmac->tx_clk)) {
129 dev_err(dev, "could not get tx clock\n");
130 ret = PTR_ERR(gmac->tx_clk);
131 goto err_remove_config_dt;
132 }
133
134 /* Optional regulator for PHY */
135 gmac->regulator = devm_regulator_get_optional(dev, "phy");
136 if (IS_ERR(gmac->regulator)) {
137 if (PTR_ERR(gmac->regulator) == -EPROBE_DEFER) {
138 ret = -EPROBE_DEFER;
139 goto err_remove_config_dt;
140 }
141 dev_info(dev, "no regulator found\n");
142 gmac->regulator = NULL;
143 }
144
145 /* platform data specifying hardware features and callbacks.
146 * hardware features were copied from Allwinner drivers. */
147 plat_dat->tx_coe = 1;
148 plat_dat->has_gmac = true;
149 plat_dat->bsp_priv = gmac;
150 plat_dat->init = sun7i_gmac_init;
151 plat_dat->exit = sun7i_gmac_exit;
152 plat_dat->fix_mac_speed = sun7i_fix_speed;
153 plat_dat->tx_fifo_size = 4096;
154 plat_dat->rx_fifo_size = 16384;
155
156 ret = sun7i_gmac_init(pdev, plat_dat->bsp_priv);
157 if (ret)
158 goto err_remove_config_dt;
159
160 ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
161 if (ret)
162 goto err_gmac_exit;
163
164 return 0;
165
166 err_gmac_exit:
167 sun7i_gmac_exit(pdev, plat_dat->bsp_priv);
168 err_remove_config_dt:
169 stmmac_remove_config_dt(pdev, plat_dat);
170
171 return ret;
172 }
173
174 static const struct of_device_id sun7i_dwmac_match[] = {
175 { .compatible = "allwinner,sun7i-a20-gmac" },
176 { }
177 };
178 MODULE_DEVICE_TABLE(of, sun7i_dwmac_match);
179
180 static struct platform_driver sun7i_dwmac_driver = {
181 .probe = sun7i_gmac_probe,
182 .remove_new = stmmac_pltfr_remove,
183 .driver = {
184 .name = "sun7i-dwmac",
185 .pm = &stmmac_pltfr_pm_ops,
186 .of_match_table = sun7i_dwmac_match,
187 },
188 };
189 module_platform_driver(sun7i_dwmac_driver);
190
191 MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>");
192 MODULE_DESCRIPTION("Allwinner sunxi DWMAC specific glue layer");
193 MODULE_LICENSE("GPL");
194