drivers/phy/msm8916-usbh-phy.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2018 Ramon Fried <ramon.fried@gmail.com>
   4  */
   5
   6 #include <common.h>
   7 #include <dm.h>
   8 #include <generic-phy.h>
   9 #include <usb/ehci-ci.h>
  10 #include <usb/ulpi.h>
  11 #include <asm/io.h>
  12
  13 /* PHY viewport regs */
  14 #define ULPI_MISC_A_READ                0x96
  15 #define ULPI_MISC_A_SET                 0x97
  16 #define ULPI_MISC_A_CLEAR               0x98
  17 #define ULPI_MISC_A_VBUSVLDEXT          BIT(0)
  18 #define ULPI_MISC_A_VBUSVLDEXTSEL       BIT(1)
  19 #define GEN2_SESS_VLD_CTRL_EN           BIT(7)
  20 #define SESS_VLD_CTRL                   BIT(25)
  21
  22 struct msm_phy_priv {
  23         void __iomem *regs;
  24         struct usb_ehci *ehci; /* Start of IP core*/
  25         struct ulpi_viewport ulpi_vp; /* ULPI Viewport */
  26 };
  27
  28 static int msm_phy_power_on(struct phy *phy)
  29 {
  30         struct msm_phy_priv *priv = dev_get_priv(phy->dev);
  31
  32         /* Select and enable external configuration with USB PHY */
  33         ulpi_write(&priv->ulpi_vp, (u8 *)ULPI_MISC_A_SET,
  34                    ULPI_MISC_A_VBUSVLDEXTSEL | ULPI_MISC_A_VBUSVLDEXT);
  35
  36         return 0;
  37 }
  38
  39 static int msm_phy_power_off(struct phy *phy)
  40 {
  41         struct msm_phy_priv *priv = dev_get_priv(phy->dev);
  42
  43         /* Disable VBUS mimicing in the controller. */
  44         ulpi_write(&priv->ulpi_vp, (u8 *)ULPI_MISC_A_CLEAR,
  45                    ULPI_MISC_A_VBUSVLDEXTSEL | ULPI_MISC_A_VBUSVLDEXT);
  46         return 0;
  47 }
  48
  49 static int msm_phy_reset(struct phy *phy)
  50 {
  51         struct msm_phy_priv *p = dev_get_priv(phy->dev);
  52
  53         /* select ULPI phy */
  54         writel(PORT_PTS_ULPI, &p->ehci->portsc);
  55
  56         /* Enable sess_vld */
  57         setbits_le32(&p->ehci->genconfig2, GEN2_SESS_VLD_CTRL_EN);
  58
  59         /* Enable external vbus configuration in the LINK */
  60         setbits_le32(&p->ehci->usbcmd, SESS_VLD_CTRL);
  61
  62         /* USB_OTG_HS_AHB_BURST */
  63         writel(0x0, &p->ehci->sbuscfg);
  64
  65         /* USB_OTG_HS_AHB_MODE: HPROT_MODE */
  66         /* Bus access related config. */
  67         writel(0x08, &p->ehci->sbusmode);
  68
  69         return 0;
  70 }
  71
  72 static int msm_phy_probe(struct udevice *dev)
  73 {
  74         struct msm_phy_priv *priv = dev_get_priv(dev);
  75
  76         priv->regs = dev_remap_addr(dev);
  77         if (!priv->regs)
  78                 return -EINVAL;
  79
  80         priv->ehci = (struct usb_ehci *)priv->regs;
  81         priv->ulpi_vp.port_num = 0;
  82
  83         /* Warning: this will not work if viewport address is > 64 bit due to
  84          * ULPI design.
  85          */
  86         priv->ulpi_vp.viewport_addr = (phys_addr_t)&priv->ehci->ulpi_viewpoint;
  87
  88         return 0;
  89 }
  90
  91 static struct phy_ops msm_phy_ops = {
  92         .power_on = msm_phy_power_on,
  93         .power_off = msm_phy_power_off,
  94         .reset = msm_phy_reset,
  95 };
  96
  97 static const struct udevice_id msm_phy_ids[] = {
  98         { .compatible = "qcom,apq8016-usbphy" },
  99         { }
 100 };
 101
 102 U_BOOT_DRIVER(msm8916_usbphy) = {
 103         .name           = "msm8916_usbphy",
 104         .id             = UCLASS_PHY,
 105         .of_match       = msm_phy_ids,
 106         .ops            = &msm_phy_ops,
 107         .probe          = msm_phy_probe,
 108         .priv_auto_alloc_size = sizeof(struct msm_phy_priv),
 109 };