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/usb/phy.h>
17 #include "common.h"
18 #include "rcar2.h"
19 
20 static int usbhs_rcar2_hardware_init(struct platform_device *pdev)
21 {
22 	struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
23 
24 	if (IS_ENABLED(CONFIG_GENERIC_PHY)) {
25 		struct phy *phy = phy_get(&pdev->dev, "usb");
26 
27 		if (IS_ERR(phy))
28 			return PTR_ERR(phy);
29 
30 		priv->phy = phy;
31 		return 0;
32 	}
33 
34 	if (IS_ENABLED(CONFIG_USB_PHY)) {
35 		struct usb_phy *usb_phy = usb_get_phy_dev(&pdev->dev, 0);
36 
37 		if (IS_ERR(usb_phy))
38 			return PTR_ERR(usb_phy);
39 
40 		priv->usb_phy = usb_phy;
41 		return 0;
42 	}
43 
44 	return -ENXIO;
45 }
46 
47 static int usbhs_rcar2_hardware_exit(struct platform_device *pdev)
48 {
49 	struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
50 
51 	if (priv->phy) {
52 		phy_put(priv->phy);
53 		priv->phy = NULL;
54 	}
55 
56 	if (priv->usb_phy) {
57 		usb_put_phy(priv->usb_phy);
58 		priv->usb_phy = NULL;
59 	}
60 
61 	return 0;
62 }
63 
64 static int usbhs_rcar2_power_ctrl(struct platform_device *pdev,
65 				void __iomem *base, int enable)
66 {
67 	struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
68 	int retval = -ENODEV;
69 
70 	if (priv->phy) {
71 		if (enable) {
72 			retval = phy_init(priv->phy);
73 
74 			if (!retval)
75 				retval = phy_power_on(priv->phy);
76 		} else {
77 			phy_power_off(priv->phy);
78 			phy_exit(priv->phy);
79 			retval = 0;
80 		}
81 	}
82 
83 	if (priv->usb_phy) {
84 		if (enable) {
85 			retval = usb_phy_init(priv->usb_phy);
86 
87 			if (!retval)
88 				retval = usb_phy_set_suspend(priv->usb_phy, 0);
89 		} else {
90 			usb_phy_set_suspend(priv->usb_phy, 1);
91 			usb_phy_shutdown(priv->usb_phy);
92 			retval = 0;
93 		}
94 	}
95 
96 	return retval;
97 }
98 
99 static int usbhs_rcar2_get_id(struct platform_device *pdev)
100 {
101 	return USBHS_GADGET;
102 }
103 
104 const struct renesas_usbhs_platform_callback usbhs_rcar2_ops = {
105 	.hardware_init = usbhs_rcar2_hardware_init,
106 	.hardware_exit = usbhs_rcar2_hardware_exit,
107 	.power_ctrl = usbhs_rcar2_power_ctrl,
108 	.get_id = usbhs_rcar2_get_id,
109 };
110