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[u-boot] / 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
13 DECLARE_GLOBAL_DATA_PTR;
14
15 static const char *const usb_dr_modes[] = {
16         [USB_DR_MODE_UNKNOWN]           = "",
17         [USB_DR_MODE_HOST]              = "host",
18         [USB_DR_MODE_PERIPHERAL]        = "peripheral",
19         [USB_DR_MODE_OTG]               = "otg",
20 };
21
22 enum usb_dr_mode usb_get_dr_mode(int node)
23 {
24         const void *fdt = gd->fdt_blob;
25         const char *dr_mode;
26         int i;
27
28         dr_mode = fdt_getprop(fdt, node, "dr_mode", NULL);
29         if (!dr_mode) {
30                 pr_err("usb dr_mode not found\n");
31                 return USB_DR_MODE_UNKNOWN;
32         }
33
34         for (i = 0; i < ARRAY_SIZE(usb_dr_modes); i++)
35                 if (!strcmp(dr_mode, usb_dr_modes[i]))
36                         return i;
37
38         return USB_DR_MODE_UNKNOWN;
39 }