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/phy/phy.h>
12 #include "common.h"
13 #include "rza.h"
14
usbhs_rza2_hardware_init(struct platform_device * pdev)15 static int usbhs_rza2_hardware_init(struct platform_device *pdev)
16 {
17 struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
18 struct phy *phy = phy_get(&pdev->dev, "usb");
19
20 if (IS_ERR(phy))
21 return PTR_ERR(phy);
22
23 priv->phy = phy;
24 return 0;
25 }
26
usbhs_rza2_hardware_exit(struct platform_device * pdev)27 static int usbhs_rza2_hardware_exit(struct platform_device *pdev)
28 {
29 struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
30
31 phy_put(&pdev->dev, priv->phy);
32 priv->phy = NULL;
33
34 return 0;
35 }
36
usbhs_rza2_power_ctrl(struct platform_device * pdev,void __iomem * base,int enable)37 static int usbhs_rza2_power_ctrl(struct platform_device *pdev,
38 void __iomem *base, int enable)
39 {
40 struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
41 int retval = 0;
42
43 if (!priv->phy)
44 return -ENODEV;
45
46 if (enable) {
47 retval = phy_init(priv->phy);
48 usbhs_bset(priv, SUSPMODE, SUSPM, SUSPM);
49 udelay(100); /* Wait for PLL to become stable */
50 if (!retval)
51 retval = phy_power_on(priv->phy);
52 } else {
53 usbhs_bset(priv, SUSPMODE, SUSPM, 0);
54 phy_power_off(priv->phy);
55 phy_exit(priv->phy);
56 }
57
58 return retval;
59 }
60
61 const struct renesas_usbhs_platform_info usbhs_rza2_plat_info = {
62 .platform_callback = {
63 .hardware_init = usbhs_rza2_hardware_init,
64 .hardware_exit = usbhs_rza2_hardware_exit,
65 .power_ctrl = usbhs_rza2_power_ctrl,
66 .get_id = usbhs_get_id_as_gadget,
67 },
68 .driver_param = {
69 .has_cnen = 1,
70 .cfifo_byte_addr = 1,
71 .has_new_pipe_configs = 1,
72 },
73 };
74