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c6eec6f3 AT |
1 | /* |
2 | * dwmac-stm32.c - DWMAC Specific Glue layer for STM32 MCU | |
3 | * | |
4 | * Copyright (C) Alexandre Torgue 2015 | |
5 | * Author: Alexandre Torgue <alexandre.torgue@gmail.com> | |
6 | * License terms: GNU General Public License (GPL), version 2 | |
7 | * | |
8 | */ | |
9 | ||
10 | #include <linux/clk.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/mfd/syscon.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/of.h> | |
15 | #include <linux/of_device.h> | |
16 | #include <linux/of_net.h> | |
17 | #include <linux/phy.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/regmap.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/stmmac.h> | |
22 | ||
23 | #include "stmmac_platform.h" | |
24 | ||
25 | #define MII_PHY_SEL_MASK BIT(23) | |
26 | ||
27 | struct stm32_dwmac { | |
28 | struct clk *clk_tx; | |
29 | struct clk *clk_rx; | |
30 | u32 mode_reg; /* MAC glue-logic mode register */ | |
31 | struct regmap *regmap; | |
32 | u32 speed; | |
33 | }; | |
34 | ||
35 | static int stm32_dwmac_init(struct plat_stmmacenet_data *plat_dat) | |
36 | { | |
37 | struct stm32_dwmac *dwmac = plat_dat->bsp_priv; | |
38 | u32 reg = dwmac->mode_reg; | |
39 | u32 val; | |
40 | int ret; | |
41 | ||
42 | val = (plat_dat->interface == PHY_INTERFACE_MODE_MII) ? 0 : 1; | |
43 | ret = regmap_update_bits(dwmac->regmap, reg, MII_PHY_SEL_MASK, val); | |
44 | if (ret) | |
45 | return ret; | |
46 | ||
47 | ret = clk_prepare_enable(dwmac->clk_tx); | |
48 | if (ret) | |
49 | return ret; | |
50 | ||
51 | ret = clk_prepare_enable(dwmac->clk_rx); | |
52 | if (ret) | |
53 | clk_disable_unprepare(dwmac->clk_tx); | |
54 | ||
55 | return ret; | |
56 | } | |
57 | ||
58 | static void stm32_dwmac_clk_disable(struct stm32_dwmac *dwmac) | |
59 | { | |
60 | clk_disable_unprepare(dwmac->clk_tx); | |
61 | clk_disable_unprepare(dwmac->clk_rx); | |
62 | } | |
63 | ||
64 | static int stm32_dwmac_parse_data(struct stm32_dwmac *dwmac, | |
65 | struct device *dev) | |
66 | { | |
67 | struct device_node *np = dev->of_node; | |
68 | int err; | |
69 | ||
70 | /* Get TX/RX clocks */ | |
71 | dwmac->clk_tx = devm_clk_get(dev, "mac-clk-tx"); | |
72 | if (IS_ERR(dwmac->clk_tx)) { | |
73 | dev_err(dev, "No tx clock provided...\n"); | |
74 | return PTR_ERR(dwmac->clk_tx); | |
75 | } | |
76 | dwmac->clk_rx = devm_clk_get(dev, "mac-clk-rx"); | |
77 | if (IS_ERR(dwmac->clk_rx)) { | |
78 | dev_err(dev, "No rx clock provided...\n"); | |
79 | return PTR_ERR(dwmac->clk_rx); | |
80 | } | |
81 | ||
82 | /* Get mode register */ | |
83 | dwmac->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscon"); | |
84 | if (IS_ERR(dwmac->regmap)) | |
85 | return PTR_ERR(dwmac->regmap); | |
86 | ||
87 | err = of_property_read_u32_index(np, "st,syscon", 1, &dwmac->mode_reg); | |
88 | if (err) | |
89 | dev_err(dev, "Can't get sysconfig mode offset (%d)\n", err); | |
90 | ||
91 | return err; | |
92 | } | |
93 | ||
94 | static int stm32_dwmac_probe(struct platform_device *pdev) | |
95 | { | |
96 | struct plat_stmmacenet_data *plat_dat; | |
97 | struct stmmac_resources stmmac_res; | |
98 | struct stm32_dwmac *dwmac; | |
99 | int ret; | |
100 | ||
101 | ret = stmmac_get_platform_resources(pdev, &stmmac_res); | |
102 | if (ret) | |
103 | return ret; | |
104 | ||
105 | plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac); | |
106 | if (IS_ERR(plat_dat)) | |
107 | return PTR_ERR(plat_dat); | |
108 | ||
109 | dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL); | |
110 | if (!dwmac) | |
111 | return -ENOMEM; | |
112 | ||
113 | ret = stm32_dwmac_parse_data(dwmac, &pdev->dev); | |
114 | if (ret) { | |
115 | dev_err(&pdev->dev, "Unable to parse OF data\n"); | |
116 | return ret; | |
117 | } | |
118 | ||
119 | plat_dat->bsp_priv = dwmac; | |
120 | ||
121 | ret = stm32_dwmac_init(plat_dat); | |
122 | if (ret) | |
123 | return ret; | |
124 | ||
125 | ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res); | |
126 | if (ret) | |
127 | stm32_dwmac_clk_disable(dwmac); | |
128 | ||
129 | return ret; | |
130 | } | |
131 | ||
132 | static int stm32_dwmac_remove(struct platform_device *pdev) | |
133 | { | |
134 | struct net_device *ndev = platform_get_drvdata(pdev); | |
135 | struct stmmac_priv *priv = netdev_priv(ndev); | |
136 | int ret = stmmac_dvr_remove(&pdev->dev); | |
137 | ||
138 | stm32_dwmac_clk_disable(priv->plat->bsp_priv); | |
139 | ||
140 | return ret; | |
141 | } | |
142 | ||
143 | #ifdef CONFIG_PM_SLEEP | |
144 | static int stm32_dwmac_suspend(struct device *dev) | |
145 | { | |
146 | struct net_device *ndev = dev_get_drvdata(dev); | |
147 | struct stmmac_priv *priv = netdev_priv(ndev); | |
148 | int ret; | |
149 | ||
150 | ret = stmmac_suspend(dev); | |
151 | stm32_dwmac_clk_disable(priv->plat->bsp_priv); | |
152 | ||
153 | return ret; | |
154 | } | |
155 | ||
156 | static int stm32_dwmac_resume(struct device *dev) | |
157 | { | |
158 | struct net_device *ndev = dev_get_drvdata(dev); | |
159 | struct stmmac_priv *priv = netdev_priv(ndev); | |
160 | int ret; | |
161 | ||
162 | ret = stm32_dwmac_init(priv->plat); | |
163 | if (ret) | |
164 | return ret; | |
165 | ||
166 | ret = stmmac_resume(dev); | |
167 | ||
168 | return ret; | |
169 | } | |
170 | #endif /* CONFIG_PM_SLEEP */ | |
171 | ||
172 | SIMPLE_DEV_PM_OPS(stm32_dwmac_pm_ops, stm32_dwmac_suspend, stm32_dwmac_resume); | |
173 | ||
174 | static const struct of_device_id stm32_dwmac_match[] = { | |
175 | { .compatible = "st,stm32-dwmac"}, | |
176 | { } | |
177 | }; | |
178 | MODULE_DEVICE_TABLE(of, stm32_dwmac_match); | |
179 | ||
180 | static struct platform_driver stm32_dwmac_driver = { | |
181 | .probe = stm32_dwmac_probe, | |
182 | .remove = stm32_dwmac_remove, | |
183 | .driver = { | |
184 | .name = "stm32-dwmac", | |
185 | .pm = &stm32_dwmac_pm_ops, | |
186 | .of_match_table = stm32_dwmac_match, | |
187 | }, | |
188 | }; | |
189 | module_platform_driver(stm32_dwmac_driver); | |
190 | ||
191 | MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@gmail.com>"); | |
192 | MODULE_DESCRIPTION("STMicroelectronics MCU DWMAC Specific Glue layer"); | |
193 | MODULE_LICENSE("GPL v2"); |