1 /*
2  * Renesas USB driver R-Car Gen. 2 initialization and power control
3  *
4  * Copyright (C) 2014 Ulrich Hecht
5  *
6  * This program is distributed in the hope that it will be useful,
7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
9  * GNU General Public License for more details.
10  *
11  */
12 
13 #include <linux/gpio.h>
14 #include <linux/of_gpio.h>
15 #include <linux/phy/phy.h>
16 #include <linux/platform_data/gpio-rcar.h>
17 #include <linux/usb/phy.h>
18 #include "common.h"
19 #include "rcar2.h"
20 
21 static int usbhs_rcar2_hardware_init(struct platform_device *pdev)
22 {
23 	struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
24 
25 	if (IS_ENABLED(CONFIG_GENERIC_PHY)) {
26 		struct phy *phy = phy_get(&pdev->dev, "usb");
27 
28 		if (IS_ERR(phy))
29 			return PTR_ERR(phy);
30 
31 		priv->phy = phy;
32 		return 0;
33 	}
34 
35 	if (IS_ENABLED(CONFIG_USB_PHY)) {
36 		struct usb_phy *usb_phy = usb_get_phy_dev(&pdev->dev, 0);
37 
38 		if (IS_ERR(usb_phy))
39 			return PTR_ERR(usb_phy);
40 
41 		priv->usb_phy = usb_phy;
42 		return 0;
43 	}
44 
45 	return -ENXIO;
46 }
47 
48 static int usbhs_rcar2_hardware_exit(struct platform_device *pdev)
49 {
50 	struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
51 
52 	if (priv->phy) {
53 		phy_put(priv->phy);
54 		priv->phy = NULL;
55 	}
56 
57 	if (priv->usb_phy) {
58 		usb_put_phy(priv->usb_phy);
59 		priv->usb_phy = NULL;
60 	}
61 
62 	return 0;
63 }
64 
65 static int usbhs_rcar2_power_ctrl(struct platform_device *pdev,
66 				void __iomem *base, int enable)
67 {
68 	struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
69 	int retval = -ENODEV;
70 
71 	if (priv->phy) {
72 		if (enable) {
73 			retval = phy_init(priv->phy);
74 
75 			if (!retval)
76 				retval = phy_power_on(priv->phy);
77 		} else {
78 			phy_power_off(priv->phy);
79 			phy_exit(priv->phy);
80 			retval = 0;
81 		}
82 	}
83 
84 	if (priv->usb_phy) {
85 		if (enable) {
86 			retval = usb_phy_init(priv->usb_phy);
87 
88 			if (!retval)
89 				retval = usb_phy_set_suspend(priv->usb_phy, 0);
90 		} else {
91 			usb_phy_set_suspend(priv->usb_phy, 1);
92 			usb_phy_shutdown(priv->usb_phy);
93 			retval = 0;
94 		}
95 	}
96 
97 	return retval;
98 }
99 
100 static int usbhs_rcar2_get_id(struct platform_device *pdev)
101 {
102 	return USBHS_GADGET;
103 }
104 
105 const struct renesas_usbhs_platform_callback usbhs_rcar2_ops = {
106 	.hardware_init = usbhs_rcar2_hardware_init,
107 	.hardware_exit = usbhs_rcar2_hardware_exit,
108 	.power_ctrl = usbhs_rcar2_power_ctrl,
109 	.get_id = usbhs_rcar2_get_id,
110 };
111