usb/renesas_usbhs/rza2.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * Renesas USB driver RZ/A2 initialization and power control
0004  *
0005  * Copyright (C) 2019 Chris Brandt
0006  * Copyright (C) 2019 Renesas Electronics Corporation
0007  */
0008
0009 #include <linux/delay.h>
0010 #include <linux/io.h>
0011 #include <linux/of_device.h>
0012 #include <linux/phy/phy.h>
0013 #include "common.h"
0014 #include "rza.h"
0015
0016 static int usbhs_rza2_hardware_init(struct platform_device *pdev)
0017 {
0018     struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
0019     struct phy *phy = phy_get(&pdev->dev, "usb");
0020
0021     if (IS_ERR(phy))
0022         return PTR_ERR(phy);
0023
0024     priv->phy = phy;
0025     return 0;
0026 }
0027
0028 static int usbhs_rza2_hardware_exit(struct platform_device *pdev)
0029 {
0030     struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
0031
0032     phy_put(&pdev->dev, priv->phy);
0033     priv->phy = NULL;
0034
0035     return 0;
0036 }
0037
0038 static int usbhs_rza2_power_ctrl(struct platform_device *pdev,
0039                 void __iomem *base, int enable)
0040 {
0041     struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
0042     int retval = 0;
0043
0044     if (!priv->phy)
0045         return -ENODEV;
0046
0047     if (enable) {
0048         retval = phy_init(priv->phy);
0049         usbhs_bset(priv, SUSPMODE, SUSPM, SUSPM);
0050         udelay(100);    /* Wait for PLL to become stable */
0051         if (!retval)
0052             retval = phy_power_on(priv->phy);
0053     } else {
0054         usbhs_bset(priv, SUSPMODE, SUSPM, 0);
0055         phy_power_off(priv->phy);
0056         phy_exit(priv->phy);
0057     }
0058
0059     return retval;
0060 }
0061
0062 const struct renesas_usbhs_platform_info usbhs_rza2_plat_info = {
0063     .platform_callback = {
0064         .hardware_init = usbhs_rza2_hardware_init,
0065         .hardware_exit = usbhs_rza2_hardware_exit,
0066         .power_ctrl = usbhs_rza2_power_ctrl,
0067         .get_id = usbhs_get_id_as_gadget,
0068     },
0069     .driver_param = {
0070         .has_cnen = 1,
0071         .cfifo_byte_addr = 1,
0072         .has_new_pipe_configs = 1,
0073     },
0074 };