drivers/usb/dwc3/dwc3-generic.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Generic DWC3 Glue layer
   4  *
   5  * Copyright (C) 2016 - 2018 Xilinx, Inc.
   6  *
   7  * Based on dwc3-omap.c.
   8  */
   9
  10 #include <common.h>
  11 #include <dm.h>
  12 #include <dm/device-internal.h>
  13 #include <dm/lists.h>
  14 #include <linux/usb/otg.h>
  15 #include <linux/compat.h>
  16 #include <linux/usb/ch9.h>
  17 #include <linux/usb/gadget.h>
  18 #include <malloc.h>
  19 #include <usb.h>
  20 #include "core.h"
  21 #include "gadget.h"
  22 #include "linux-compat.h"
  23
  24 #if CONFIG_IS_ENABLED(DM_USB_GADGET)
  25 int usb_gadget_handle_interrupts(int index)
  26 {
  27         struct dwc3 *priv;
  28         struct udevice *dev;
  29         int ret;
  30
  31         ret = uclass_first_device(UCLASS_USB_DEV_GENERIC, &dev);
  32         if (!dev || ret) {
  33                 pr_err("No USB device found\n");
  34                 return -ENODEV;
  35         }
  36
  37         priv = dev_get_priv(dev);
  38
  39         dwc3_gadget_uboot_handle_interrupt(priv);
  40
  41         return 0;
  42 }
  43
  44 static int dwc3_generic_peripheral_probe(struct udevice *dev)
  45 {
  46         struct dwc3 *priv = dev_get_priv(dev);
  47
  48         return dwc3_init(priv);
  49 }
  50
  51 static int dwc3_generic_peripheral_remove(struct udevice *dev)
  52 {
  53         struct dwc3 *priv = dev_get_priv(dev);
  54
  55         dwc3_remove(priv);
  56
  57         return 0;
  58 }
  59
  60 static int dwc3_generic_peripheral_ofdata_to_platdata(struct udevice *dev)
  61 {
  62         struct dwc3 *priv = dev_get_priv(dev);
  63         int node = dev_of_offset(dev);
  64
  65         priv->regs = (void *)devfdt_get_addr(dev);
  66         priv->regs += DWC3_GLOBALS_REGS_START;
  67
  68         priv->maximum_speed = usb_get_maximum_speed(node);
  69         if (priv->maximum_speed == USB_SPEED_UNKNOWN) {
  70                 pr_err("Invalid usb maximum speed\n");
  71                 return -ENODEV;
  72         }
  73
  74         priv->dr_mode = usb_get_dr_mode(node);
  75         if (priv->dr_mode == USB_DR_MODE_UNKNOWN) {
  76                 pr_err("Invalid usb mode setup\n");
  77                 return -ENODEV;
  78         }
  79
  80         return 0;
  81 }
  82
  83 static int dwc3_generic_peripheral_bind(struct udevice *dev)
  84 {
  85         return device_probe(dev);
  86 }
  87
  88 U_BOOT_DRIVER(dwc3_generic_peripheral) = {
  89         .name   = "dwc3-generic-peripheral",
  90         .id     = UCLASS_USB_DEV_GENERIC,
  91         .ofdata_to_platdata = dwc3_generic_peripheral_ofdata_to_platdata,
  92         .probe = dwc3_generic_peripheral_probe,
  93         .remove = dwc3_generic_peripheral_remove,
  94         .bind = dwc3_generic_peripheral_bind,
  95         .platdata_auto_alloc_size = sizeof(struct usb_platdata),
  96         .priv_auto_alloc_size = sizeof(struct dwc3),
  97         .flags  = DM_FLAG_ALLOC_PRIV_DMA,
  98 };
  99 #endif
 100
 101 static int dwc3_generic_bind(struct udevice *parent)
 102 {
 103         const void *fdt = gd->fdt_blob;
 104         int node;
 105         int ret;
 106
 107         for (node = fdt_first_subnode(fdt, dev_of_offset(parent)); node > 0;
 108              node = fdt_next_subnode(fdt, node)) {
 109                 const char *name = fdt_get_name(fdt, node, NULL);
 110                 enum usb_dr_mode dr_mode;
 111                 struct udevice *dev;
 112                 const char *driver;
 113
 114                 debug("%s: subnode name: %s\n", __func__, name);
 115                 if (strncmp(name, "dwc3@", 4))
 116                         continue;
 117
 118                 dr_mode = usb_get_dr_mode(node);
 119
 120                 switch (dr_mode) {
 121                 case USB_DR_MODE_PERIPHERAL:
 122                 case USB_DR_MODE_OTG:
 123                         debug("%s: dr_mode: OTG or Peripheral\n", __func__);
 124                         driver = "dwc3-generic-peripheral";
 125                         break;
 126                 case USB_DR_MODE_HOST:
 127                         debug("%s: dr_mode: HOST\n", __func__);
 128                         driver = "dwc3-generic-host";
 129                         break;
 130                 default:
 131                         debug("%s: unsupported dr_mode\n", __func__);
 132                         return -ENODEV;
 133                 };
 134
 135                 ret = device_bind_driver_to_node(parent, driver, name,
 136                                                  offset_to_ofnode(node), &dev);
 137                 if (ret) {
 138                         debug("%s: not able to bind usb device mode\n",
 139                               __func__);
 140                         return ret;
 141                 }
 142         }
 143
 144         return 0;
 145 }
 146
 147 static const struct udevice_id dwc3_generic_ids[] = {
 148         { .compatible = "xlnx,zynqmp-dwc3" },
 149         { }
 150 };
 151
 152 U_BOOT_DRIVER(dwc3_generic_wrapper) = {
 153         .name   = "dwc3-generic-wrapper",
 154         .id     = UCLASS_MISC,
 155         .of_match = dwc3_generic_ids,
 156         .bind = dwc3_generic_bind,
 157 };