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 <asm-generic/io.h>
  12 #include <dm.h>
  13 #include <dm/device-internal.h>
  14 #include <dm/lists.h>
  15 #include <dwc3-uboot.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 <reset.h>
  23 #include <clk.h>
  24
  25 #if CONFIG_IS_ENABLED(DM_USB_GADGET)
  26 struct dwc3_generic_peripheral {
  27         struct dwc3 dwc3;
  28         struct phy *phys;
  29         int num_phys;
  30         fdt_addr_t base;
  31 };
  32
  33 int dm_usb_gadget_handle_interrupts(struct udevice *dev)
  34 {
  35         struct dwc3_generic_peripheral *priv = dev_get_priv(dev);
  36         struct dwc3 *dwc3 = &priv->dwc3;
  37
  38         dwc3_gadget_uboot_handle_interrupt(dwc3);
  39
  40         return 0;
  41 }
  42
  43 static int dwc3_generic_peripheral_probe(struct udevice *dev)
  44 {
  45         int rc;
  46         struct dwc3_generic_peripheral *priv = dev_get_priv(dev);
  47         struct dwc3 *dwc3 = &priv->dwc3;
  48
  49         rc = dwc3_setup_phy(dev, &priv->phys, &priv->num_phys);
  50         if (rc)
  51                 return rc;
  52
  53         dwc3->regs = map_physmem(priv->base, DWC3_OTG_REGS_END, MAP_NOCACHE);
  54         dwc3->regs += DWC3_GLOBALS_REGS_START;
  55         dwc3->dev = dev;
  56
  57         rc =  dwc3_init(dwc3);
  58         if (rc) {
  59                 unmap_physmem(dwc3->regs, MAP_NOCACHE);
  60                 return rc;
  61         }
  62
  63         return 0;
  64 }
  65
  66 static int dwc3_generic_peripheral_remove(struct udevice *dev)
  67 {
  68         struct dwc3_generic_peripheral *priv = dev_get_priv(dev);
  69         struct dwc3 *dwc3 = &priv->dwc3;
  70
  71         dwc3_remove(dwc3);
  72         dwc3_shutdown_phy(dev, priv->phys, priv->num_phys);
  73         unmap_physmem(dwc3->regs, MAP_NOCACHE);
  74
  75         return 0;
  76 }
  77
  78 static int dwc3_generic_peripheral_ofdata_to_platdata(struct udevice *dev)
  79 {
  80         struct dwc3_generic_peripheral *priv = dev_get_priv(dev);
  81         struct dwc3 *dwc3 = &priv->dwc3;
  82         int node = dev_of_offset(dev);
  83
  84         priv->base = devfdt_get_addr(dev);
  85
  86         dwc3->maximum_speed = usb_get_maximum_speed(node);
  87         if (dwc3->maximum_speed == USB_SPEED_UNKNOWN) {
  88                 pr_err("Invalid usb maximum speed\n");
  89                 return -ENODEV;
  90         }
  91
  92         dwc3->dr_mode = usb_get_dr_mode(node);
  93         if (dwc3->dr_mode == USB_DR_MODE_UNKNOWN) {
  94                 pr_err("Invalid usb mode setup\n");
  95                 return -ENODEV;
  96         }
  97
  98         return 0;
  99 }
 100
 101 U_BOOT_DRIVER(dwc3_generic_peripheral) = {
 102         .name   = "dwc3-generic-peripheral",
 103         .id     = UCLASS_USB_GADGET_GENERIC,
 104         .ofdata_to_platdata = dwc3_generic_peripheral_ofdata_to_platdata,
 105         .probe = dwc3_generic_peripheral_probe,
 106         .remove = dwc3_generic_peripheral_remove,
 107         .priv_auto_alloc_size = sizeof(struct dwc3_generic_peripheral),
 108 };
 109 #endif
 110
 111 struct dwc3_glue_data {
 112         struct clk_bulk         clks;
 113         struct reset_ctl_bulk   resets;
 114         fdt_addr_t regs;
 115 };
 116
 117 struct dwc3_glue_ops {
 118         void (*select_dr_mode)(struct udevice *dev, int index,
 119                                enum usb_dr_mode mode);
 120 };
 121
 122 static int dwc3_glue_bind(struct udevice *parent)
 123 {
 124         const void *fdt = gd->fdt_blob;
 125         int node;
 126         int ret;
 127
 128         for (node = fdt_first_subnode(fdt, dev_of_offset(parent)); node > 0;
 129              node = fdt_next_subnode(fdt, node)) {
 130                 const char *name = fdt_get_name(fdt, node, NULL);
 131                 enum usb_dr_mode dr_mode;
 132                 struct udevice *dev;
 133                 const char *driver = NULL;
 134
 135                 debug("%s: subnode name: %s\n", __func__, name);
 136
 137                 dr_mode = usb_get_dr_mode(node);
 138
 139                 switch (dr_mode) {
 140                 case USB_DR_MODE_PERIPHERAL:
 141                 case USB_DR_MODE_OTG:
 142 #if CONFIG_IS_ENABLED(DM_USB_GADGET)
 143                         debug("%s: dr_mode: OTG or Peripheral\n", __func__);
 144                         driver = "dwc3-generic-peripheral";
 145 #endif
 146                         break;
 147                 case USB_DR_MODE_HOST:
 148                         debug("%s: dr_mode: HOST\n", __func__);
 149                         driver = "xhci-dwc3";
 150                         break;
 151                 default:
 152                         debug("%s: unsupported dr_mode\n", __func__);
 153                         return -ENODEV;
 154                 };
 155
 156                 if (!driver)
 157                         continue;
 158
 159                 ret = device_bind_driver_to_node(parent, driver, name,
 160                                                  offset_to_ofnode(node), &dev);
 161                 if (ret) {
 162                         debug("%s: not able to bind usb device mode\n",
 163                               __func__);
 164                         return ret;
 165                 }
 166         }
 167
 168         return 0;
 169 }
 170
 171 static int dwc3_glue_reset_init(struct udevice *dev,
 172                                 struct dwc3_glue_data *glue)
 173 {
 174         int ret;
 175
 176         ret = reset_get_bulk(dev, &glue->resets);
 177         if (ret == -ENOTSUPP)
 178                 return 0;
 179         else if (ret)
 180                 return ret;
 181
 182         ret = reset_deassert_bulk(&glue->resets);
 183         if (ret) {
 184                 reset_release_bulk(&glue->resets);
 185                 return ret;
 186         }
 187
 188         return 0;
 189 }
 190
 191 static int dwc3_glue_clk_init(struct udevice *dev,
 192                               struct dwc3_glue_data *glue)
 193 {
 194         int ret;
 195
 196         ret = clk_get_bulk(dev, &glue->clks);
 197         if (ret == -ENOSYS)
 198                 return 0;
 199         if (ret)
 200                 return ret;
 201
 202 #if CONFIG_IS_ENABLED(CLK)
 203         ret = clk_enable_bulk(&glue->clks);
 204         if (ret) {
 205                 clk_release_bulk(&glue->clks);
 206                 return ret;
 207         }
 208 #endif
 209
 210         return 0;
 211 }
 212
 213 static int dwc3_glue_probe(struct udevice *dev)
 214 {
 215         struct dwc3_glue_ops *ops = (struct dwc3_glue_ops *)dev_get_driver_data(dev);
 216         struct dwc3_glue_data *glue = dev_get_platdata(dev);
 217         struct udevice *child = NULL;
 218         int index = 0;
 219         int ret;
 220
 221         glue->regs = dev_read_addr(dev);
 222
 223         ret = dwc3_glue_clk_init(dev, glue);
 224         if (ret)
 225                 return ret;
 226
 227         ret = dwc3_glue_reset_init(dev, glue);
 228         if (ret)
 229                 return ret;
 230
 231         ret = device_find_first_child(dev, &child);
 232         if (ret)
 233                 return ret;
 234
 235         while (child) {
 236                 enum usb_dr_mode dr_mode;
 237
 238                 dr_mode = usb_get_dr_mode(dev_of_offset(child));
 239                 device_find_next_child(&child);
 240                 if (ops && ops->select_dr_mode)
 241                         ops->select_dr_mode(dev, index, dr_mode);
 242                 index++;
 243         }
 244
 245         return 0;
 246 }
 247
 248 static int dwc3_glue_remove(struct udevice *dev)
 249 {
 250         struct dwc3_glue_data *glue = dev_get_platdata(dev);
 251
 252         reset_release_bulk(&glue->resets);
 253
 254         clk_release_bulk(&glue->clks);
 255
 256         return dm_scan_fdt_dev(dev);
 257 }
 258
 259 static const struct udevice_id dwc3_glue_ids[] = {
 260         { .compatible = "xlnx,zynqmp-dwc3" },
 261         { }
 262 };
 263
 264 U_BOOT_DRIVER(dwc3_generic_wrapper) = {
 265         .name   = "dwc3-generic-wrapper",
 266         .id     = UCLASS_MISC,
 267         .of_match = dwc3_glue_ids,
 268         .bind = dwc3_glue_bind,
 269         .probe = dwc3_glue_probe,
 270         .remove = dwc3_glue_remove,
 271         .platdata_auto_alloc_size = sizeof(struct dwc3_glue_data),
 272
 273 };