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1 /* Texas Instruments Ethernet Switch Driver
2  *
3  * Copyright (C) 2013 Texas Instruments
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU General Public License
7  * version 2 as published by the Free Software Foundation.
8  *
9  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
10  * kind, whether express or implied; without even the implied warranty
11  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  */
14
15 #include <linux/platform_device.h>
16 #include <linux/module.h>
17 #include <linux/netdevice.h>
18 #include <linux/phy.h>
19 #include <linux/of.h>
20 #include <linux/of_device.h>
21
22 #include "cpsw.h"
23
24 /* AM33xx SoC specific definitions for the CONTROL port */
25 #define AM33XX_GMII_SEL_MODE_MII        0
26 #define AM33XX_GMII_SEL_MODE_RMII       1
27 #define AM33XX_GMII_SEL_MODE_RGMII      2
28
29 #define AM33XX_GMII_SEL_RMII2_IO_CLK_EN BIT(7)
30 #define AM33XX_GMII_SEL_RMII1_IO_CLK_EN BIT(6)
31
32 struct cpsw_phy_sel_priv {
33         struct device   *dev;
34         u32 __iomem     *gmii_sel;
35         bool            rmii_clock_external;
36         void (*cpsw_phy_sel)(struct cpsw_phy_sel_priv *priv,
37                              phy_interface_t phy_mode, int slave);
38 };
39
40
41 static void cpsw_gmii_sel_am3352(struct cpsw_phy_sel_priv *priv,
42                                  phy_interface_t phy_mode, int slave)
43 {
44         u32 reg;
45         u32 mask;
46         u32 mode = 0;
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         case PHY_INTERFACE_MODE_RGMII_ID:
57         case PHY_INTERFACE_MODE_RGMII_RXID:
58         case PHY_INTERFACE_MODE_RGMII_TXID:
59                 mode = AM33XX_GMII_SEL_MODE_RGMII;
60                 break;
61
62         case PHY_INTERFACE_MODE_MII:
63         default:
64                 mode = AM33XX_GMII_SEL_MODE_MII;
65                 break;
66         };
67
68         mask = 0x3 << (slave * 2) | BIT(slave + 6);
69         mode <<= slave * 2;
70
71         if (priv->rmii_clock_external) {
72                 if (slave == 0)
73                         mode |= AM33XX_GMII_SEL_RMII1_IO_CLK_EN;
74                 else
75                         mode |= AM33XX_GMII_SEL_RMII2_IO_CLK_EN;
76         }
77
78         reg &= ~mask;
79         reg |= mode;
80
81         writel(reg, priv->gmii_sel);
82 }
83
84 static struct platform_driver cpsw_phy_sel_driver;
85 static int match(struct device *dev, void *data)
86 {
87         struct device_node *node = (struct device_node *)data;
88         return dev->of_node == node &&
89                 dev->driver == &cpsw_phy_sel_driver.driver;
90 }
91
92 void cpsw_phy_sel(struct device *dev, phy_interface_t phy_mode, int slave)
93 {
94         struct device_node *node;
95         struct cpsw_phy_sel_priv *priv;
96
97         node = of_get_child_by_name(dev->of_node, "cpsw-phy-sel");
98         if (!node) {
99                 dev_err(dev, "Phy mode driver DT not found\n");
100                 return;
101         }
102
103         dev = bus_find_device(&platform_bus_type, NULL, node, match);
104         priv = dev_get_drvdata(dev);
105
106         priv->cpsw_phy_sel(priv, phy_mode, slave);
107 }
108 EXPORT_SYMBOL_GPL(cpsw_phy_sel);
109
110 static const struct of_device_id cpsw_phy_sel_id_table[] = {
111         {
112                 .compatible     = "ti,am3352-cpsw-phy-sel",
113                 .data           = &cpsw_gmii_sel_am3352,
114         },
115         {}
116 };
117 MODULE_DEVICE_TABLE(of, cpsw_phy_sel_id_table);
118
119 static int cpsw_phy_sel_probe(struct platform_device *pdev)
120 {
121         struct resource *res;
122         const struct of_device_id *of_id;
123         struct cpsw_phy_sel_priv *priv;
124
125         of_id = of_match_node(cpsw_phy_sel_id_table, pdev->dev.of_node);
126         if (!of_id)
127                 return -EINVAL;
128
129         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
130         if (!priv) {
131                 dev_err(&pdev->dev, "unable to alloc memory for cpsw phy sel\n");
132                 return -ENOMEM;
133         }
134
135         priv->cpsw_phy_sel = of_id->data;
136
137         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "gmii-sel");
138         priv->gmii_sel = devm_ioremap_resource(&pdev->dev, res);
139         if (IS_ERR(priv->gmii_sel))
140                 return PTR_ERR(priv->gmii_sel);
141
142         if (of_find_property(pdev->dev.of_node, "rmii-clock-ext", NULL))
143                 priv->rmii_clock_external = true;
144
145         dev_set_drvdata(&pdev->dev, priv);
146
147         return 0;
148 }
149
150 static struct platform_driver cpsw_phy_sel_driver = {
151         .probe          = cpsw_phy_sel_probe,
152         .driver         = {
153                 .name   = "cpsw-phy-sel",
154                 .owner  = THIS_MODULE,
155                 .of_match_table = cpsw_phy_sel_id_table,
156         },
157 };
158
159 module_platform_driver(cpsw_phy_sel_driver);
160 MODULE_AUTHOR("Mugunthan V N <mugunthanvnm@ti.com>");
161 MODULE_LICENSE("GPL v2");