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 <dwc3-uboot.h>
  15 #include <linux/usb/ch9.h>
  16 #include <linux/usb/gadget.h>
  17 #include <malloc.h>
  18 #include <usb.h>
  19 #include "core.h"
  20 #include "gadget.h"
  21 #include <reset.h>
  22 #include <clk.h>
  23
  24 #if CONFIG_IS_ENABLED(DM_USB_GADGET)
  25 struct dwc3_generic_peripheral {
  26         struct dwc3 dwc3;
  27         struct phy *phys;
  28         int num_phys;
  29         fdt_addr_t base;
  30 };
  31
  32 int dm_usb_gadget_handle_interrupts(struct udevice *dev)
  33 {
  34         struct dwc3_generic_peripheral *priv = dev_get_priv(dev);
  35         struct dwc3 *dwc3 = &priv->dwc3;
  36
  37         dwc3_gadget_uboot_handle_interrupt(dwc3);
  38
  39         return 0;
  40 }
  41
  42 static int dwc3_generic_peripheral_probe(struct udevice *dev)
  43 {
  44         int rc;
  45         struct dwc3_generic_peripheral *priv = dev_get_priv(dev);
  46         struct dwc3 *dwc3 = &priv->dwc3;
  47
  48         rc = dwc3_setup_phy(dev, &priv->phys, &priv->num_phys);
  49         if (rc)
  50                 return rc;
  51
  52         dwc3->regs = map_physmem(priv->base, DWC3_OTG_REGS_END, MAP_NOCACHE);
  53         dwc3->regs += DWC3_GLOBALS_REGS_START;
  54         dwc3->dev = dev;
  55
  56         rc =  dwc3_init(dwc3);
  57         if (rc) {
  58                 unmap_physmem(dwc3->regs, MAP_NOCACHE);
  59                 return rc;
  60         }
  61
  62         return 0;
  63 }
  64
  65 static int dwc3_generic_peripheral_remove(struct udevice *dev)
  66 {
  67         struct dwc3_generic_peripheral *priv = dev_get_priv(dev);
  68         struct dwc3 *dwc3 = &priv->dwc3;
  69
  70         dwc3_remove(dwc3);
  71         dwc3_shutdown_phy(dev, priv->phys, priv->num_phys);
  72         unmap_physmem(dwc3->regs, MAP_NOCACHE);
  73
  74         return 0;
  75 }
  76
  77 static int dwc3_generic_peripheral_ofdata_to_platdata(struct udevice *dev)
  78 {
  79         struct dwc3_generic_peripheral *priv = dev_get_priv(dev);
  80         struct dwc3 *dwc3 = &priv->dwc3;
  81         int node = dev_of_offset(dev);
  82
  83         priv->base = devfdt_get_addr(dev);
  84
  85         dwc3->maximum_speed = usb_get_maximum_speed(node);
  86         if (dwc3->maximum_speed == USB_SPEED_UNKNOWN) {
  87                 pr_err("Invalid usb maximum speed\n");
  88                 return -ENODEV;
  89         }
  90
  91         dwc3->dr_mode = usb_get_dr_mode(node);
  92         if (dwc3->dr_mode == USB_DR_MODE_UNKNOWN) {
  93                 pr_err("Invalid usb mode setup\n");
  94                 return -ENODEV;
  95         }
  96
  97         return 0;
  98 }
  99
 100 U_BOOT_DRIVER(dwc3_generic_peripheral) = {
 101         .name   = "dwc3-generic-peripheral",
 102         .id     = UCLASS_USB_GADGET_GENERIC,
 103         .ofdata_to_platdata = dwc3_generic_peripheral_ofdata_to_platdata,
 104         .probe = dwc3_generic_peripheral_probe,
 105         .remove = dwc3_generic_peripheral_remove,
 106         .priv_auto_alloc_size = sizeof(struct dwc3_generic_peripheral),
 107 };
 108 #endif
 109
 110 struct dwc3_glue_data {
 111         struct clk_bulk         clks;
 112         struct reset_ctl_bulk   resets;
 113 };
 114
 115 static int dwc3_glue_bind(struct udevice *parent)
 116 {
 117         const void *fdt = gd->fdt_blob;
 118         int node;
 119         int ret;
 120
 121         for (node = fdt_first_subnode(fdt, dev_of_offset(parent)); node > 0;
 122              node = fdt_next_subnode(fdt, node)) {
 123                 const char *name = fdt_get_name(fdt, node, NULL);
 124                 enum usb_dr_mode dr_mode;
 125                 struct udevice *dev;
 126                 const char *driver = NULL;
 127
 128                 debug("%s: subnode name: %s\n", __func__, name);
 129
 130                 dr_mode = usb_get_dr_mode(node);
 131
 132                 switch (dr_mode) {
 133                 case USB_DR_MODE_PERIPHERAL:
 134                 case USB_DR_MODE_OTG:
 135 #if CONFIG_IS_ENABLED(DM_USB_GADGET)
 136                         debug("%s: dr_mode: OTG or Peripheral\n", __func__);
 137                         driver = "dwc3-generic-peripheral";
 138 #endif
 139                         break;
 140                 case USB_DR_MODE_HOST:
 141                         debug("%s: dr_mode: HOST\n", __func__);
 142                         driver = "xhci-dwc3";
 143                         break;
 144                 default:
 145                         debug("%s: unsupported dr_mode\n", __func__);
 146                         return -ENODEV;
 147                 };
 148
 149                 if (!driver)
 150                         continue;
 151
 152                 ret = device_bind_driver_to_node(parent, driver, name,
 153                                                  offset_to_ofnode(node), &dev);
 154                 if (ret) {
 155                         debug("%s: not able to bind usb device mode\n",
 156                               __func__);
 157                         return ret;
 158                 }
 159         }
 160
 161         return 0;
 162 }
 163
 164 static int dwc3_glue_reset_init(struct udevice *dev,
 165                                 struct dwc3_glue_data *glue)
 166 {
 167         int ret;
 168
 169         ret = reset_get_bulk(dev, &glue->resets);
 170         if (ret == -ENOTSUPP)
 171                 return 0;
 172         else if (ret)
 173                 return ret;
 174
 175         ret = reset_deassert_bulk(&glue->resets);
 176         if (ret) {
 177                 reset_release_bulk(&glue->resets);
 178                 return ret;
 179         }
 180
 181         return 0;
 182 }
 183
 184 static int dwc3_glue_clk_init(struct udevice *dev,
 185                               struct dwc3_glue_data *glue)
 186 {
 187         int ret;
 188
 189         ret = clk_get_bulk(dev, &glue->clks);
 190         if (ret == -ENOSYS)
 191                 return 0;
 192         if (ret)
 193                 return ret;
 194
 195 #if CONFIG_IS_ENABLED(CLK)
 196         ret = clk_enable_bulk(&glue->clks);
 197         if (ret) {
 198                 clk_release_bulk(&glue->clks);
 199                 return ret;
 200         }
 201 #endif
 202
 203         return 0;
 204 }
 205
 206 static int dwc3_glue_probe(struct udevice *dev)
 207 {
 208         struct dwc3_glue_data *glue = dev_get_platdata(dev);
 209         int ret;
 210
 211         ret = dwc3_glue_clk_init(dev, glue);
 212         if (ret)
 213                 return ret;
 214
 215         ret = dwc3_glue_reset_init(dev, glue);
 216         if (ret)
 217                 return ret;
 218
 219         return 0;
 220 }
 221
 222 static int dwc3_glue_remove(struct udevice *dev)
 223 {
 224         struct dwc3_glue_data *glue = dev_get_platdata(dev);
 225
 226         reset_release_bulk(&glue->resets);
 227
 228         clk_release_bulk(&glue->clks);
 229
 230         return dm_scan_fdt_dev(dev);
 231 }
 232
 233 static const struct udevice_id dwc3_glue_ids[] = {
 234         { .compatible = "xlnx,zynqmp-dwc3" },
 235         { }
 236 };
 237
 238 U_BOOT_DRIVER(dwc3_generic_wrapper) = {
 239         .name   = "dwc3-generic-wrapper",
 240         .id     = UCLASS_MISC,
 241         .of_match = dwc3_glue_ids,
 242         .bind = dwc3_glue_bind,
 243         .probe = dwc3_glue_probe,
 244         .remove = dwc3_glue_remove,
 245         .platdata_auto_alloc_size = sizeof(struct dwc3_glue_data),
 246
 247 };