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