drivers/usb/host/ehci-zynq.c

   1 /*
   2  * (C) Copyright 2014, Xilinx, Inc
   3  *
   4  * USB Low level initialization(Specific to zynq)
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10 #include <dm.h>
  11 #include <usb.h>
  12 #include <asm/arch/hardware.h>
  13 #include <asm/arch/sys_proto.h>
  14 #include <asm/io.h>
  15 #include <usb/ehci-ci.h>
  16 #include <usb/ulpi.h>
  17
  18 #include "ehci.h"
  19
  20 struct zynq_ehci_priv {
  21         struct ehci_ctrl ehcictrl;
  22         struct usb_ehci *ehci;
  23 };
  24
  25 static int ehci_zynq_ofdata_to_platdata(struct udevice *dev)
  26 {
  27         struct zynq_ehci_priv *priv = dev_get_priv(dev);
  28
  29         priv->ehci = (struct usb_ehci *)devfdt_get_addr_ptr(dev);
  30         if (!priv->ehci)
  31                 return -EINVAL;
  32
  33         return 0;
  34 }
  35
  36 static int ehci_zynq_probe(struct udevice *dev)
  37 {
  38         struct usb_platdata *plat = dev_get_platdata(dev);
  39         struct zynq_ehci_priv *priv = dev_get_priv(dev);
  40         struct ehci_hccr *hccr;
  41         struct ehci_hcor *hcor;
  42         struct ulpi_viewport ulpi_vp;
  43         /* Used for writing the ULPI data address */
  44         struct ulpi_regs *ulpi = (struct ulpi_regs *)0;
  45         int ret;
  46
  47         hccr = (struct ehci_hccr *)((uint32_t)&priv->ehci->caplength);
  48         hcor = (struct ehci_hcor *)((uint32_t) hccr +
  49                         HC_LENGTH(ehci_readl(&hccr->cr_capbase)));
  50
  51         ulpi_vp.viewport_addr = (u32)&priv->ehci->ulpi_viewpoint;
  52         ulpi_vp.port_num = 0;
  53
  54         ret = ulpi_init(&ulpi_vp);
  55         if (ret) {
  56                 puts("zynq ULPI viewport init failed\n");
  57                 return -1;
  58         }
  59
  60         /* ULPI set flags */
  61         ulpi_write(&ulpi_vp, &ulpi->otg_ctrl,
  62                    ULPI_OTG_DP_PULLDOWN | ULPI_OTG_DM_PULLDOWN |
  63                    ULPI_OTG_EXTVBUSIND);
  64         ulpi_write(&ulpi_vp, &ulpi->function_ctrl,
  65                    ULPI_FC_FULL_SPEED | ULPI_FC_OPMODE_NORMAL |
  66                    ULPI_FC_SUSPENDM);
  67         ulpi_write(&ulpi_vp, &ulpi->iface_ctrl, 0);
  68
  69         /* Set VBus */
  70         ulpi_write(&ulpi_vp, &ulpi->otg_ctrl_set,
  71                    ULPI_OTG_DRVVBUS | ULPI_OTG_DRVVBUS_EXT);
  72
  73         return ehci_register(dev, hccr, hcor, NULL, 0, plat->init_type);
  74 }
  75
  76 static const struct udevice_id ehci_zynq_ids[] = {
  77         { .compatible = "xlnx,zynq-usb-2.20a" },
  78         { }
  79 };
  80
  81 U_BOOT_DRIVER(ehci_zynq) = {
  82         .name   = "ehci_zynq",
  83         .id     = UCLASS_USB,
  84         .of_match = ehci_zynq_ids,
  85         .ofdata_to_platdata = ehci_zynq_ofdata_to_platdata,
  86         .probe = ehci_zynq_probe,
  87         .remove = ehci_deregister,
  88         .ops    = &ehci_usb_ops,
  89         .platdata_auto_alloc_size = sizeof(struct usb_platdata),
  90         .priv_auto_alloc_size = sizeof(struct zynq_ehci_priv),
  91         .flags  = DM_FLAG_ALLOC_PRIV_DMA,
  92 };