1 /**************************************************************************/
2 /* */
3 /* Copyright (c) Microsoft Corporation. All rights reserved. */
4 /* */
5 /* This software is licensed under the Microsoft Software License */
6 /* Terms for Microsoft Azure RTOS. Full text of the license can be */
7 /* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
8 /* and in the root directory of this software. */
9 /* */
10 /**************************************************************************/
11
12
13 /**************************************************************************/
14 /**************************************************************************/
15 /** */
16 /** USBX Component */
17 /** */
18 /** EHCI Controller Driver */
19 /** */
20 /**************************************************************************/
21 /**************************************************************************/
22
23
24 /* Include necessary system files. */
25
26 #define UX_SOURCE_CODE
27
28 #include "ux_api.h"
29 #include "ux_hcd_ehci.h"
30 #include "ux_host_stack.h"
31
32
33 /**************************************************************************/
34 /* */
35 /* FUNCTION RELEASE */
36 /* */
37 /* _ux_hcd_ehci_endpoint_reset PORTABLE C */
38 /* 6.1 */
39 /* AUTHOR */
40 /* */
41 /* Chaoqiong Xiao, Microsoft Corporation */
42 /* */
43 /* DESCRIPTION */
44 /* */
45 /* This function will reset an endpoint. */
46 /* */
47 /* INPUT */
48 /* */
49 /* hcd_ehci Pointer to EHCI controller */
50 /* endpoint Pointer to endpoint */
51 /* */
52 /* OUTPUT */
53 /* */
54 /* Completion Status */
55 /* */
56 /* CALLS */
57 /* */
58 /* None */
59 /* */
60 /* CALLED BY */
61 /* */
62 /* EHCI Controller Driver */
63 /* */
64 /* RELEASE HISTORY */
65 /* */
66 /* DATE NAME DESCRIPTION */
67 /* */
68 /* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
69 /* 09-30-2020 Chaoqiong Xiao Modified comment(s), */
70 /* resulting in version 6.1 */
71 /* */
72 /**************************************************************************/
_ux_hcd_ehci_endpoint_reset(UX_HCD_EHCI * hcd_ehci,UX_ENDPOINT * endpoint)73 UINT _ux_hcd_ehci_endpoint_reset(UX_HCD_EHCI *hcd_ehci, UX_ENDPOINT *endpoint)
74 {
75
76 UX_EHCI_ED *ed;
77 ULONG ed_value;
78
79
80 UX_PARAMETER_NOT_USED(hcd_ehci);
81
82 /* From the endpoint container fetch the EHCI ED descriptor. */
83 ed = (UX_EHCI_ED*) endpoint -> ux_endpoint_ed;
84
85 /* Reset the data0/data1 toggle bit in the Overlay portion of the ED. */
86 ed_value = ed -> ux_ehci_ed_state;
87 ed_value &= ~UX_EHCI_QH_TOGGLE;
88 ed -> ux_ehci_ed_state = ed_value;
89
90 /* This operation never fails! */
91 return(UX_SUCCESS);
92 }
93
94
