1 /* Texas Instruments Ethernet Switch Driver
3 * Copyright (C) 2013 Texas Instruments
5 * Module Author: Mugunthan V N <mugunthanvnm@ti.com>
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * version 2 as published by the Free Software Foundation.
11 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
12 * kind, whether express or implied; without even the implied warranty
13 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
17 #include <linux/platform_device.h>
18 #include <linux/init.h>
19 #include <linux/netdevice.h>
20 #include <linux/phy.h>
22 #include <linux/of_device.h>
26 /* AM33xx SoC specific definitions for the CONTROL port */
27 #define AM33XX_GMII_SEL_MODE_MII 0
28 #define AM33XX_GMII_SEL_MODE_RMII 1
29 #define AM33XX_GMII_SEL_MODE_RGMII 2
31 #define AM33XX_GMII_SEL_RMII2_IO_CLK_EN BIT(7)
32 #define AM33XX_GMII_SEL_RMII1_IO_CLK_EN BIT(6)
33 #define AM33XX_GMII_SEL_RGMII2_IDMODE BIT(5)
34 #define AM33XX_GMII_SEL_RGMII1_IDMODE BIT(4)
36 #define GMII_SEL_MODE_MASK 0x3
38 struct cpsw_phy_sel_priv
{
40 u32 __iomem
*gmii_sel
;
41 bool rmii_clock_external
;
42 void (*cpsw_phy_sel
)(struct cpsw_phy_sel_priv
*priv
,
43 phy_interface_t phy_mode
, int slave
);
47 static void cpsw_gmii_sel_am3352(struct cpsw_phy_sel_priv
*priv
,
48 phy_interface_t phy_mode
, int slave
)
53 bool rgmii_id
= false;
55 reg
= readl(priv
->gmii_sel
);
58 case PHY_INTERFACE_MODE_RMII
:
59 mode
= AM33XX_GMII_SEL_MODE_RMII
;
62 case PHY_INTERFACE_MODE_RGMII
:
63 mode
= AM33XX_GMII_SEL_MODE_RGMII
;
66 case PHY_INTERFACE_MODE_RGMII_ID
:
67 case PHY_INTERFACE_MODE_RGMII_RXID
:
68 case PHY_INTERFACE_MODE_RGMII_TXID
:
69 mode
= AM33XX_GMII_SEL_MODE_RGMII
;
75 "Unsupported PHY mode: \"%s\". Defaulting to MII.\n",
78 case PHY_INTERFACE_MODE_MII
:
79 mode
= AM33XX_GMII_SEL_MODE_MII
;
83 mask
= GMII_SEL_MODE_MASK
<< (slave
* 2) | BIT(slave
+ 6);
84 mask
|= BIT(slave
+ 4);
87 if (priv
->rmii_clock_external
) {
89 mode
|= AM33XX_GMII_SEL_RMII1_IO_CLK_EN
;
91 mode
|= AM33XX_GMII_SEL_RMII2_IO_CLK_EN
;
96 mode
|= AM33XX_GMII_SEL_RGMII1_IDMODE
;
98 mode
|= AM33XX_GMII_SEL_RGMII2_IDMODE
;
104 writel(reg
, priv
->gmii_sel
);
107 static void cpsw_gmii_sel_dra7xx(struct cpsw_phy_sel_priv
*priv
,
108 phy_interface_t phy_mode
, int slave
)
114 reg
= readl(priv
->gmii_sel
);
117 case PHY_INTERFACE_MODE_RMII
:
118 mode
= AM33XX_GMII_SEL_MODE_RMII
;
121 case PHY_INTERFACE_MODE_RGMII
:
122 case PHY_INTERFACE_MODE_RGMII_ID
:
123 case PHY_INTERFACE_MODE_RGMII_RXID
:
124 case PHY_INTERFACE_MODE_RGMII_TXID
:
125 mode
= AM33XX_GMII_SEL_MODE_RGMII
;
130 "Unsupported PHY mode: \"%s\". Defaulting to MII.\n",
131 phy_modes(phy_mode
));
133 case PHY_INTERFACE_MODE_MII
:
134 mode
= AM33XX_GMII_SEL_MODE_MII
;
140 mask
= GMII_SEL_MODE_MASK
;
143 mask
= GMII_SEL_MODE_MASK
<< 4;
147 dev_err(priv
->dev
, "invalid slave number...\n");
151 if (priv
->rmii_clock_external
)
152 dev_err(priv
->dev
, "RMII External clock is not supported\n");
157 writel(reg
, priv
->gmii_sel
);
160 static struct platform_driver cpsw_phy_sel_driver
;
161 static int match(struct device
*dev
, void *data
)
163 struct device_node
*node
= (struct device_node
*)data
;
164 return dev
->of_node
== node
&&
165 dev
->driver
== &cpsw_phy_sel_driver
.driver
;
168 void cpsw_phy_sel(struct device
*dev
, phy_interface_t phy_mode
, int slave
)
170 struct device_node
*node
;
171 struct cpsw_phy_sel_priv
*priv
;
173 node
= of_get_child_by_name(dev
->of_node
, "cpsw-phy-sel");
175 dev_err(dev
, "Phy mode driver DT not found\n");
179 dev
= bus_find_device(&platform_bus_type
, NULL
, node
, match
);
181 priv
= dev_get_drvdata(dev
);
183 priv
->cpsw_phy_sel(priv
, phy_mode
, slave
);
187 EXPORT_SYMBOL_GPL(cpsw_phy_sel
);
189 static const struct of_device_id cpsw_phy_sel_id_table
[] = {
191 .compatible
= "ti,am3352-cpsw-phy-sel",
192 .data
= &cpsw_gmii_sel_am3352
,
195 .compatible
= "ti,dra7xx-cpsw-phy-sel",
196 .data
= &cpsw_gmii_sel_dra7xx
,
199 .compatible
= "ti,am43xx-cpsw-phy-sel",
200 .data
= &cpsw_gmii_sel_am3352
,
205 static int cpsw_phy_sel_probe(struct platform_device
*pdev
)
207 struct resource
*res
;
208 const struct of_device_id
*of_id
;
209 struct cpsw_phy_sel_priv
*priv
;
211 of_id
= of_match_node(cpsw_phy_sel_id_table
, pdev
->dev
.of_node
);
215 priv
= devm_kzalloc(&pdev
->dev
, sizeof(*priv
), GFP_KERNEL
);
217 dev_err(&pdev
->dev
, "unable to alloc memory for cpsw phy sel\n");
221 priv
->dev
= &pdev
->dev
;
222 priv
->cpsw_phy_sel
= of_id
->data
;
224 res
= platform_get_resource_byname(pdev
, IORESOURCE_MEM
, "gmii-sel");
225 priv
->gmii_sel
= devm_ioremap_resource(&pdev
->dev
, res
);
226 if (IS_ERR(priv
->gmii_sel
))
227 return PTR_ERR(priv
->gmii_sel
);
229 if (of_find_property(pdev
->dev
.of_node
, "rmii-clock-ext", NULL
))
230 priv
->rmii_clock_external
= true;
232 dev_set_drvdata(&pdev
->dev
, priv
);
237 static struct platform_driver cpsw_phy_sel_driver
= {
238 .probe
= cpsw_phy_sel_probe
,
240 .name
= "cpsw-phy-sel",
241 .of_match_table
= cpsw_phy_sel_id_table
,
244 builtin_platform_driver(cpsw_phy_sel_driver
);