drivers/usb/host/ehci-msm.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Qualcomm EHCI driver
   4  *
   5  * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
   6  *
   7  * Based on Linux driver
   8  */
   9
  10 #include <common.h>
  11 #include <dm.h>
  12 #include <errno.h>
  13 #include <fdtdec.h>
  14 #include <linux/libfdt.h>
  15 #include <usb.h>
  16 #include <usb/ehci-ci.h>
  17 #include <usb/ulpi.h>
  18 #include <wait_bit.h>
  19 #include <asm/gpio.h>
  20 #include <asm/io.h>
  21 #include <linux/compat.h>
  22 #include "ehci.h"
  23
  24 struct msm_ehci_priv {
  25         struct ehci_ctrl ctrl; /* Needed by EHCI */
  26         struct usb_ehci *ehci; /* Start of IP core*/
  27         struct ulpi_viewport ulpi_vp; /* ULPI Viewport */
  28         struct phy phy;
  29 };
  30
  31 static int msm_init_after_reset(struct ehci_ctrl *dev)
  32 {
  33         struct msm_ehci_priv *p = container_of(dev, struct msm_ehci_priv, ctrl);
  34         struct usb_ehci *ehci = p->ehci;
  35
  36         generic_phy_reset(&p->phy);
  37
  38         /* set mode to host controller */
  39         writel(CM_HOST, &ehci->usbmode);
  40
  41         return 0;
  42 }
  43
  44 static const struct ehci_ops msm_ehci_ops = {
  45         .init_after_reset = msm_init_after_reset
  46 };
  47
  48 static int ehci_usb_probe(struct udevice *dev)
  49 {
  50         struct msm_ehci_priv *p = dev_get_priv(dev);
  51         struct usb_ehci *ehci = p->ehci;
  52         struct usb_platdata *plat = dev_get_platdata(dev);
  53         struct ehci_hccr *hccr;
  54         struct ehci_hcor *hcor;
  55         int ret;
  56
  57         hccr = (struct ehci_hccr *)((phys_addr_t)&ehci->caplength);
  58         hcor = (struct ehci_hcor *)((phys_addr_t)hccr +
  59                         HC_LENGTH(ehci_readl(&(hccr)->cr_capbase)));
  60
  61         ret = ehci_setup_phy(dev, &p->phy, 0);
  62         if (ret)
  63                 return ret;
  64
  65         ret = board_usb_init(0, plat->init_type);
  66         if (ret < 0)
  67                 return ret;
  68
  69         return ehci_register(dev, hccr, hcor, &msm_ehci_ops, 0,
  70                              plat->init_type);
  71 }
  72
  73 static int ehci_usb_remove(struct udevice *dev)
  74 {
  75         struct msm_ehci_priv *p = dev_get_priv(dev);
  76         struct usb_ehci *ehci = p->ehci;
  77         int ret;
  78
  79         ret = ehci_deregister(dev);
  80         if (ret)
  81                 return ret;
  82
  83         /* Stop controller. */
  84         clrbits_le32(&ehci->usbcmd, CMD_RUN);
  85
  86         ret = ehci_shutdown_phy(dev, &p->phy);
  87         if (ret)
  88                 return ret;
  89
  90         ret = board_usb_init(0, USB_INIT_DEVICE); /* Board specific hook */
  91         if (ret < 0)
  92                 return ret;
  93
  94         /* Reset controller */
  95         setbits_le32(&ehci->usbcmd, CMD_RESET);
  96
  97         /* Wait for reset */
  98         if (wait_for_bit_le32(&ehci->usbcmd, CMD_RESET, false, 30, false)) {
  99                 printf("Stuck on USB reset.\n");
 100                 return -ETIMEDOUT;
 101         }
 102
 103         return 0;
 104 }
 105
 106 static int ehci_usb_ofdata_to_platdata(struct udevice *dev)
 107 {
 108         struct msm_ehci_priv *priv = dev_get_priv(dev);
 109
 110         priv->ulpi_vp.port_num = 0;
 111         priv->ehci = (void *)devfdt_get_addr(dev);
 112
 113         if (priv->ehci == (void *)FDT_ADDR_T_NONE)
 114                 return -EINVAL;
 115
 116         /* Warning: this will not work if viewport address is > 64 bit due to
 117          * ULPI design.
 118          */
 119         priv->ulpi_vp.viewport_addr = (phys_addr_t)&priv->ehci->ulpi_viewpoint;
 120
 121         return 0;
 122 }
 123
 124 static const struct udevice_id ehci_usb_ids[] = {
 125         { .compatible = "qcom,ehci-host", },
 126         { }
 127 };
 128
 129 U_BOOT_DRIVER(usb_ehci) = {
 130         .name   = "ehci_msm",
 131         .id     = UCLASS_USB,
 132         .of_match = ehci_usb_ids,
 133         .ofdata_to_platdata = ehci_usb_ofdata_to_platdata,
 134         .probe = ehci_usb_probe,
 135         .remove = ehci_usb_remove,
 136         .ops    = &ehci_usb_ops,
 137         .priv_auto_alloc_size = sizeof(struct msm_ehci_priv),
 138         .platdata_auto_alloc_size = sizeof(struct usb_platdata),
 139         .flags  = DM_FLAG_ALLOC_PRIV_DMA,
 140 };