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 <linux/bitops.h>
  10 #include <usb/ehci-ci.h>
  11 #include <usb/ulpi.h>
  12 #include <asm/io.h>
  13
  14 /* PHY viewport regs */
  15 #define ULPI_MISC_A_READ                0x96
  16 #define ULPI_MISC_A_SET                 0x97
  17 #define ULPI_MISC_A_CLEAR               0x98
  18 #define ULPI_MISC_A_VBUSVLDEXT          BIT(0)
  19 #define ULPI_MISC_A_VBUSVLDEXTSEL       BIT(1)
  20 #define GEN2_SESS_VLD_CTRL_EN           BIT(7)
  21 #define SESS_VLD_CTRL                   BIT(25)
  22
  23 struct msm_phy_priv {
  24         void __iomem *regs;
  25         struct usb_ehci *ehci; /* Start of IP core*/
  26         struct ulpi_viewport ulpi_vp; /* ULPI Viewport */
  27 };
  28
  29 static int msm_phy_power_on(struct phy *phy)
  30 {
  31         struct msm_phy_priv *priv = dev_get_priv(phy->dev);
  32
  33         /* Select and enable external configuration with USB PHY */
  34         ulpi_write(&priv->ulpi_vp, (u8 *)ULPI_MISC_A_SET,
  35                    ULPI_MISC_A_VBUSVLDEXTSEL | ULPI_MISC_A_VBUSVLDEXT);
  36
  37         return 0;
  38 }
  39
  40 static int msm_phy_power_off(struct phy *phy)
  41 {
  42         struct msm_phy_priv *priv = dev_get_priv(phy->dev);
  43
  44         /* Disable VBUS mimicing in the controller. */
  45         ulpi_write(&priv->ulpi_vp, (u8 *)ULPI_MISC_A_CLEAR,
  46                    ULPI_MISC_A_VBUSVLDEXTSEL | ULPI_MISC_A_VBUSVLDEXT);
  47         return 0;
  48 }
  49
  50 static int msm_phy_reset(struct phy *phy)
  51 {
  52         struct msm_phy_priv *p = dev_get_priv(phy->dev);
  53
  54         /* select ULPI phy */
  55         writel(PORT_PTS_ULPI, &p->ehci->portsc);
  56
  57         /* Enable sess_vld */
  58         setbits_le32(&p->ehci->genconfig2, GEN2_SESS_VLD_CTRL_EN);
  59
  60         /* Enable external vbus configuration in the LINK */
  61         setbits_le32(&p->ehci->usbcmd, SESS_VLD_CTRL);
  62
  63         /* USB_OTG_HS_AHB_BURST */
  64         writel(0x0, &p->ehci->sbuscfg);
  65
  66         /* USB_OTG_HS_AHB_MODE: HPROT_MODE */
  67         /* Bus access related config. */
  68         writel(0x08, &p->ehci->sbusmode);
  69
  70         return 0;
  71 }
  72
  73 static int msm_phy_probe(struct udevice *dev)
  74 {
  75         struct msm_phy_priv *priv = dev_get_priv(dev);
  76
  77         priv->regs = dev_remap_addr(dev);
  78         if (!priv->regs)
  79                 return -EINVAL;
  80
  81         priv->ehci = (struct usb_ehci *)priv->regs;
  82         priv->ulpi_vp.port_num = 0;
  83
  84         /* Warning: this will not work if viewport address is > 64 bit due to
  85          * ULPI design.
  86          */
  87         priv->ulpi_vp.viewport_addr = (phys_addr_t)&priv->ehci->ulpi_viewpoint;
  88
  89         return 0;
  90 }
  91
  92 static struct phy_ops msm_phy_ops = {
  93         .power_on = msm_phy_power_on,
  94         .power_off = msm_phy_power_off,
  95         .reset = msm_phy_reset,
  96 };
  97
  98 static const struct udevice_id msm_phy_ids[] = {
  99         { .compatible = "qcom,apq8016-usbphy" },
 100         { }
 101 };
 102
 103 U_BOOT_DRIVER(msm8916_usbphy) = {
 104         .name           = "msm8916_usbphy",
 105         .id             = UCLASS_PHY,
 106         .of_match       = msm_phy_ids,
 107         .ops            = &msm_phy_ops,
 108         .probe          = msm_phy_probe,
 109         .priv_auto_alloc_size = sizeof(struct msm_phy_priv),
 110 };