drivers/usb/common/common.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Provides code common for host and device side USB.
   4  *
   5  * (C) Copyright 2016
   6  *     Texas Instruments Incorporated, <www.ti.com>
   7  */
   8
   9 #include <common.h>
  10 #include <linux/libfdt.h>
  11 #include <linux/usb/otg.h>
  12 #include <linux/usb/ch9.h>
  13
  14 DECLARE_GLOBAL_DATA_PTR;
  15
  16 static const char *const usb_dr_modes[] = {
  17         [USB_DR_MODE_UNKNOWN]           = "",
  18         [USB_DR_MODE_HOST]              = "host",
  19         [USB_DR_MODE_PERIPHERAL]        = "peripheral",
  20         [USB_DR_MODE_OTG]               = "otg",
  21 };
  22
  23 enum usb_dr_mode usb_get_dr_mode(int node)
  24 {
  25         const void *fdt = gd->fdt_blob;
  26         const char *dr_mode;
  27         int i;
  28
  29         dr_mode = fdt_getprop(fdt, node, "dr_mode", NULL);
  30         if (!dr_mode) {
  31                 pr_err("usb dr_mode not found\n");
  32                 return USB_DR_MODE_UNKNOWN;
  33         }
  34
  35         for (i = 0; i < ARRAY_SIZE(usb_dr_modes); i++)
  36                 if (!strcmp(dr_mode, usb_dr_modes[i]))
  37                         return i;
  38
  39         return USB_DR_MODE_UNKNOWN;
  40 }
  41
  42 static const char *const speed_names[] = {
  43         [USB_SPEED_UNKNOWN] = "UNKNOWN",
  44         [USB_SPEED_LOW] = "low-speed",
  45         [USB_SPEED_FULL] = "full-speed",
  46         [USB_SPEED_HIGH] = "high-speed",
  47         [USB_SPEED_WIRELESS] = "wireless",
  48         [USB_SPEED_SUPER] = "super-speed",
  49 };
  50
  51 enum usb_device_speed usb_get_maximum_speed(int node)
  52 {
  53         const void *fdt = gd->fdt_blob;
  54         const char *max_speed;
  55         int i;
  56
  57         max_speed = fdt_getprop(fdt, node, "maximum-speed", NULL);
  58         if (!max_speed) {
  59                 pr_err("usb maximum-speed not found\n");
  60                 return USB_SPEED_UNKNOWN;
  61         }
  62
  63         for (i = 0; i < ARRAY_SIZE(speed_names); i++)
  64                 if (!strcmp(max_speed, speed_names[i]))
  65                         return i;
  66
  67         return USB_SPEED_UNKNOWN;
  68 }