1 // SPDX-License-Identifier: GPL-2.0
2 /* Texas Instruments Ethernet Switch Driver
3  *
4  * Copyright (C) 2013 Texas Instruments
5  *
6  * Module Author: Mugunthan V N <mugunthanvnm@ti.com>
7  *
8  */
9 
10 #include <linux/platform_device.h>
11 #include <linux/init.h>
12 #include <linux/netdevice.h>
13 #include <linux/phy.h>
14 #include <linux/of.h>
15 #include <linux/of_device.h>
16 
17 #include "cpsw.h"
18 
19 /* AM33xx SoC specific definitions for the CONTROL port */
20 #define AM33XX_GMII_SEL_MODE_MII	0
21 #define AM33XX_GMII_SEL_MODE_RMII	1
22 #define AM33XX_GMII_SEL_MODE_RGMII	2
23 
24 #define AM33XX_GMII_SEL_RMII2_IO_CLK_EN	BIT(7)
25 #define AM33XX_GMII_SEL_RMII1_IO_CLK_EN	BIT(6)
26 #define AM33XX_GMII_SEL_RGMII2_IDMODE	BIT(5)
27 #define AM33XX_GMII_SEL_RGMII1_IDMODE	BIT(4)
28 
29 #define GMII_SEL_MODE_MASK		0x3
30 
31 struct cpsw_phy_sel_priv {
32 	struct device	*dev;
33 	u32 __iomem	*gmii_sel;
34 	bool		rmii_clock_external;
35 	void (*cpsw_phy_sel)(struct cpsw_phy_sel_priv *priv,
36 			     phy_interface_t phy_mode, int slave);
37 };
38 
39 
40 static void cpsw_gmii_sel_am3352(struct cpsw_phy_sel_priv *priv,
41 				 phy_interface_t phy_mode, int slave)
42 {
43 	u32 reg;
44 	u32 mask;
45 	u32 mode = 0;
46 	bool rgmii_id = false;
47 
48 	reg = readl(priv->gmii_sel);
49 
50 	switch (phy_mode) {
51 	case PHY_INTERFACE_MODE_RMII:
52 		mode = AM33XX_GMII_SEL_MODE_RMII;
53 		break;
54 
55 	case PHY_INTERFACE_MODE_RGMII:
56 		mode = AM33XX_GMII_SEL_MODE_RGMII;
57 		break;
58 
59 	case PHY_INTERFACE_MODE_RGMII_ID:
60 	case PHY_INTERFACE_MODE_RGMII_RXID:
61 	case PHY_INTERFACE_MODE_RGMII_TXID:
62 		mode = AM33XX_GMII_SEL_MODE_RGMII;
63 		rgmii_id = true;
64 		break;
65 
66 	default:
67 		dev_warn(priv->dev,
68 			 "Unsupported PHY mode: \"%s\". Defaulting to MII.\n",
69 			phy_modes(phy_mode));
70 		fallthrough;
71 	case PHY_INTERFACE_MODE_MII:
72 		mode = AM33XX_GMII_SEL_MODE_MII;
73 		break;
74 	}
75 
76 	mask = GMII_SEL_MODE_MASK << (slave * 2) | BIT(slave + 6);
77 	mask |= BIT(slave + 4);
78 	mode <<= slave * 2;
79 
80 	if (priv->rmii_clock_external) {
81 		if (slave == 0)
82 			mode |= AM33XX_GMII_SEL_RMII1_IO_CLK_EN;
83 		else
84 			mode |= AM33XX_GMII_SEL_RMII2_IO_CLK_EN;
85 	}
86 
87 	if (rgmii_id) {
88 		if (slave == 0)
89 			mode |= AM33XX_GMII_SEL_RGMII1_IDMODE;
90 		else
91 			mode |= AM33XX_GMII_SEL_RGMII2_IDMODE;
92 	}
93 
94 	reg &= ~mask;
95 	reg |= mode;
96 
97 	writel(reg, priv->gmii_sel);
98 }
99 
100 static void cpsw_gmii_sel_dra7xx(struct cpsw_phy_sel_priv *priv,
101 				 phy_interface_t phy_mode, int slave)
102 {
103 	u32 reg;
104 	u32 mask;
105 	u32 mode = 0;
106 
107 	reg = readl(priv->gmii_sel);
108 
109 	switch (phy_mode) {
110 	case PHY_INTERFACE_MODE_RMII:
111 		mode = AM33XX_GMII_SEL_MODE_RMII;
112 		break;
113 
114 	case PHY_INTERFACE_MODE_RGMII:
115 	case PHY_INTERFACE_MODE_RGMII_ID:
116 	case PHY_INTERFACE_MODE_RGMII_RXID:
117 	case PHY_INTERFACE_MODE_RGMII_TXID:
118 		mode = AM33XX_GMII_SEL_MODE_RGMII;
119 		break;
120 
121 	default:
122 		dev_warn(priv->dev,
123 			 "Unsupported PHY mode: \"%s\". Defaulting to MII.\n",
124 			phy_modes(phy_mode));
125 		fallthrough;
126 	case PHY_INTERFACE_MODE_MII:
127 		mode = AM33XX_GMII_SEL_MODE_MII;
128 		break;
129 	}
130 
131 	switch (slave) {
132 	case 0:
133 		mask = GMII_SEL_MODE_MASK;
134 		break;
135 	case 1:
136 		mask = GMII_SEL_MODE_MASK << 4;
137 		mode <<= 4;
138 		break;
139 	default:
140 		dev_err(priv->dev, "invalid slave number...\n");
141 		return;
142 	}
143 
144 	if (priv->rmii_clock_external)
145 		dev_err(priv->dev, "RMII External clock is not supported\n");
146 
147 	reg &= ~mask;
148 	reg |= mode;
149 
150 	writel(reg, priv->gmii_sel);
151 }
152 
153 static struct platform_driver cpsw_phy_sel_driver;
154 static int match(struct device *dev, const void *data)
155 {
156 	const struct device_node *node = (const struct device_node *)data;
157 	return dev->of_node == node &&
158 		dev->driver == &cpsw_phy_sel_driver.driver;
159 }
160 
161 void cpsw_phy_sel(struct device *dev, phy_interface_t phy_mode, int slave)
162 {
163 	struct device_node *node;
164 	struct cpsw_phy_sel_priv *priv;
165 
166 	node = of_parse_phandle(dev->of_node, "cpsw-phy-sel", 0);
167 	if (!node) {
168 		node = of_get_child_by_name(dev->of_node, "cpsw-phy-sel");
169 		if (!node) {
170 			dev_err(dev, "Phy mode driver DT not found\n");
171 			return;
172 		}
173 	}
174 
175 	dev = bus_find_device(&platform_bus_type, NULL, node, match);
176 	if (!dev) {
177 		dev_err(dev, "unable to find platform device for %pOF\n", node);
178 		goto out;
179 	}
180 
181 	priv = dev_get_drvdata(dev);
182 
183 	priv->cpsw_phy_sel(priv, phy_mode, slave);
184 
185 	put_device(dev);
186 out:
187 	of_node_put(node);
188 }
189 EXPORT_SYMBOL_GPL(cpsw_phy_sel);
190 
191 static const struct of_device_id cpsw_phy_sel_id_table[] = {
192 	{
193 		.compatible	= "ti,am3352-cpsw-phy-sel",
194 		.data		= &cpsw_gmii_sel_am3352,
195 	},
196 	{
197 		.compatible	= "ti,dra7xx-cpsw-phy-sel",
198 		.data		= &cpsw_gmii_sel_dra7xx,
199 	},
200 	{
201 		.compatible	= "ti,am43xx-cpsw-phy-sel",
202 		.data		= &cpsw_gmii_sel_am3352,
203 	},
204 	{}
205 };
206 
207 static int cpsw_phy_sel_probe(struct platform_device *pdev)
208 {
209 	struct resource	*res;
210 	const struct of_device_id *of_id;
211 	struct cpsw_phy_sel_priv *priv;
212 
213 	of_id = of_match_node(cpsw_phy_sel_id_table, pdev->dev.of_node);
214 	if (!of_id)
215 		return -EINVAL;
216 
217 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
218 	if (!priv) {
219 		dev_err(&pdev->dev, "unable to alloc memory for cpsw phy sel\n");
220 		return -ENOMEM;
221 	}
222 
223 	priv->dev = &pdev->dev;
224 	priv->cpsw_phy_sel = of_id->data;
225 
226 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "gmii-sel");
227 	priv->gmii_sel = devm_ioremap_resource(&pdev->dev, res);
228 	if (IS_ERR(priv->gmii_sel))
229 		return PTR_ERR(priv->gmii_sel);
230 
231 	if (of_find_property(pdev->dev.of_node, "rmii-clock-ext", NULL))
232 		priv->rmii_clock_external = true;
233 
234 	dev_set_drvdata(&pdev->dev, priv);
235 
236 	return 0;
237 }
238 
239 static struct platform_driver cpsw_phy_sel_driver = {
240 	.probe		= cpsw_phy_sel_probe,
241 	.driver		= {
242 		.name	= "cpsw-phy-sel",
243 		.of_match_table = cpsw_phy_sel_id_table,
244 	},
245 };
246 builtin_platform_driver(cpsw_phy_sel_driver);
247