1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Renesas USB driver RZ/A2 initialization and power control
4  *
5  * Copyright (C) 2019 Chris Brandt
6  * Copyright (C) 2019 Renesas Electronics Corporation
7  */
8 
9 #include <linux/delay.h>
10 #include <linux/io.h>
11 #include <linux/of_device.h>
12 #include <linux/phy/phy.h>
13 #include "common.h"
14 #include "rza.h"
15 
usbhs_rza2_hardware_init(struct platform_device * pdev)16 static int usbhs_rza2_hardware_init(struct platform_device *pdev)
17 {
18 	struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
19 	struct phy *phy = phy_get(&pdev->dev, "usb");
20 
21 	if (IS_ERR(phy))
22 		return PTR_ERR(phy);
23 
24 	priv->phy = phy;
25 	return 0;
26 }
27 
usbhs_rza2_hardware_exit(struct platform_device * pdev)28 static int usbhs_rza2_hardware_exit(struct platform_device *pdev)
29 {
30 	struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
31 
32 	phy_put(&pdev->dev, priv->phy);
33 	priv->phy = NULL;
34 
35 	return 0;
36 }
37 
usbhs_rza2_power_ctrl(struct platform_device * pdev,void __iomem * base,int enable)38 static int usbhs_rza2_power_ctrl(struct platform_device *pdev,
39 				void __iomem *base, int enable)
40 {
41 	struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
42 	int retval = 0;
43 
44 	if (!priv->phy)
45 		return -ENODEV;
46 
47 	if (enable) {
48 		retval = phy_init(priv->phy);
49 		usbhs_bset(priv, SUSPMODE, SUSPM, SUSPM);
50 		udelay(100);	/* Wait for PLL to become stable */
51 		if (!retval)
52 			retval = phy_power_on(priv->phy);
53 	} else {
54 		usbhs_bset(priv, SUSPMODE, SUSPM, 0);
55 		phy_power_off(priv->phy);
56 		phy_exit(priv->phy);
57 	}
58 
59 	return retval;
60 }
61 
62 const struct renesas_usbhs_platform_info usbhs_rza2_plat_info = {
63 	.platform_callback = {
64 		.hardware_init = usbhs_rza2_hardware_init,
65 		.hardware_exit = usbhs_rza2_hardware_exit,
66 		.power_ctrl = usbhs_rza2_power_ctrl,
67 		.get_id = usbhs_get_id_as_gadget,
68 	},
69 	.driver_param = {
70 		.has_cnen = 1,
71 		.cfifo_byte_addr = 1,
72 		.has_new_pipe_configs = 1,
73 	},
74 };
75