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 | |
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(regulator: 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(mode: gmac->interface)) { |
48 | clk_set_rate(clk: gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE); |
49 | clk_prepare_enable(clk: gmac->tx_clk); |
50 | gmac->clk_enabled = 1; |
51 | } else { |
52 | clk_set_rate(clk: gmac->tx_clk, SUN7I_GMAC_MII_RATE); |
53 | ret = clk_prepare(clk: gmac->tx_clk); |
54 | if (ret && gmac->regulator) |
55 | regulator_disable(regulator: gmac->regulator); |
56 | } |
57 | |
58 | return ret; |
59 | } |
60 | |
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(clk: gmac->tx_clk); |
67 | gmac->clk_enabled = 0; |
68 | } |
69 | clk_unprepare(clk: gmac->tx_clk); |
70 | |
71 | if (gmac->regulator) |
72 | regulator_disable(regulator: gmac->regulator); |
73 | } |
74 | |
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(clk: gmac->tx_clk); |
85 | gmac->clk_enabled = 0; |
86 | } |
87 | clk_unprepare(clk: gmac->tx_clk); |
88 | |
89 | if (speed == 1000) { |
90 | clk_set_rate(clk: gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE); |
91 | clk_prepare_enable(clk: gmac->tx_clk); |
92 | gmac->clk_enabled = 1; |
93 | } else { |
94 | clk_set_rate(clk: gmac->tx_clk, SUN7I_GMAC_MII_RATE); |
95 | clk_prepare(clk: gmac->tx_clk); |
96 | } |
97 | } |
98 | |
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: &stmmac_res); |
108 | if (ret) |
109 | return ret; |
110 | |
111 | plat_dat = devm_stmmac_probe_config_dt(pdev, mac: stmmac_res.mac); |
112 | if (IS_ERR(ptr: plat_dat)) |
113 | return PTR_ERR(ptr: plat_dat); |
114 | |
115 | gmac = devm_kzalloc(dev, size: sizeof(*gmac), GFP_KERNEL); |
116 | if (!gmac) |
117 | return -ENOMEM; |
118 | |
119 | ret = of_get_phy_mode(np: dev->of_node, interface: &gmac->interface); |
120 | if (ret && ret != -ENODEV) { |
121 | dev_err(dev, "Can't get phy-mode\n" ); |
122 | return ret; |
123 | } |
124 | |
125 | gmac->tx_clk = devm_clk_get(dev, id: "allwinner_gmac_tx" ); |
126 | if (IS_ERR(ptr: gmac->tx_clk)) { |
127 | dev_err(dev, "could not get tx clock\n" ); |
128 | return PTR_ERR(ptr: gmac->tx_clk); |
129 | } |
130 | |
131 | /* Optional regulator for PHY */ |
132 | gmac->regulator = devm_regulator_get_optional(dev, id: "phy" ); |
133 | if (IS_ERR(ptr: gmac->regulator)) { |
134 | if (PTR_ERR(ptr: gmac->regulator) == -EPROBE_DEFER) |
135 | return -EPROBE_DEFER; |
136 | dev_info(dev, "no regulator found\n" ); |
137 | gmac->regulator = NULL; |
138 | } |
139 | |
140 | /* platform data specifying hardware features and callbacks. |
141 | * hardware features were copied from Allwinner drivers. */ |
142 | plat_dat->tx_coe = 1; |
143 | plat_dat->has_gmac = true; |
144 | plat_dat->bsp_priv = gmac; |
145 | plat_dat->init = sun7i_gmac_init; |
146 | plat_dat->exit = sun7i_gmac_exit; |
147 | plat_dat->fix_mac_speed = sun7i_fix_speed; |
148 | plat_dat->tx_fifo_size = 4096; |
149 | plat_dat->rx_fifo_size = 16384; |
150 | |
151 | ret = sun7i_gmac_init(pdev, priv: plat_dat->bsp_priv); |
152 | if (ret) |
153 | return ret; |
154 | |
155 | ret = stmmac_dvr_probe(device: &pdev->dev, plat_dat, res: &stmmac_res); |
156 | if (ret) |
157 | goto err_gmac_exit; |
158 | |
159 | return 0; |
160 | |
161 | err_gmac_exit: |
162 | sun7i_gmac_exit(pdev, priv: plat_dat->bsp_priv); |
163 | |
164 | return ret; |
165 | } |
166 | |
167 | static const struct of_device_id sun7i_dwmac_match[] = { |
168 | { .compatible = "allwinner,sun7i-a20-gmac" }, |
169 | { } |
170 | }; |
171 | MODULE_DEVICE_TABLE(of, sun7i_dwmac_match); |
172 | |
173 | static struct platform_driver sun7i_dwmac_driver = { |
174 | .probe = sun7i_gmac_probe, |
175 | .remove_new = stmmac_pltfr_remove, |
176 | .driver = { |
177 | .name = "sun7i-dwmac" , |
178 | .pm = &stmmac_pltfr_pm_ops, |
179 | .of_match_table = sun7i_dwmac_match, |
180 | }, |
181 | }; |
182 | module_platform_driver(sun7i_dwmac_driver); |
183 | |
184 | MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>" ); |
185 | MODULE_DESCRIPTION("Allwinner sunxi DWMAC specific glue layer" ); |
186 | MODULE_LICENSE("GPL" ); |
187 | |