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1 | S3C24XX USB Host support |
2 | ======================== | |
3 | ||
4 | ||
5 | ||
6 | Introduction | |
7 | ------------ | |
8 | ||
9 | This document details the S3C2410/S3C2440 in-built OHCI USB host support. | |
10 | ||
11 | Configuration | |
12 | ------------- | |
13 | ||
14 | Enable at least the following kernel options: | |
15 | ||
16 | menuconfig: | |
17 | ||
18 | Device Drivers ---> | |
19 | USB support ---> | |
20 | <*> Support for Host-side USB | |
21 | <*> OHCI HCD support | |
22 | ||
23 | ||
24 | .config: | |
25 | CONFIG_USB | |
26 | CONFIG_USB_OHCI_HCD | |
27 | ||
28 | ||
29 | Once these options are configured, the standard set of USB device | |
30 | drivers can be configured and used. | |
31 | ||
32 | ||
33 | Board Support | |
34 | ------------- | |
35 | ||
36 | The driver attaches to a platform device, which will need to be | |
37 | added by the board specific support file in linux/arch/arm/mach-s3c2410, | |
38 | such as mach-bast.c or mach-smdk2410.c | |
39 | ||
40 | The platform device's platform_data field is only needed if the | |
41 | board implements extra power control or over-current monitoring. | |
42 | ||
43 | The OHCI driver does not ensure the state of the S3C2410's MISCCTRL | |
44 | register, so if both ports are to be used for the host, then it is | |
45 | the board support file's responsibility to ensure that the second | |
46 | port is configured to be connected to the OHCI core. | |
47 | ||
48 | ||
49 | Platform Data | |
50 | ------------- | |
51 | ||
a09e64fb | 52 | See arch/arm/mach-s3c2410/include/mach/usb-control.h for the |
c59d071d BD |
53 | descriptions of the platform device data. An implementation |
54 | can be found in linux/arch/arm/mach-s3c2410/usb-simtec.c . | |
55 | ||
56 | The `struct s3c2410_hcd_info` contains a pair of functions | |
57 | that get called to enable over-current detection, and to | |
58 | control the port power status. | |
59 | ||
60 | The ports are numbered 0 and 1. | |
61 | ||
62 | power_control: | |
63 | ||
64 | Called to enable or disable the power on the port. | |
65 | ||
66 | enable_oc: | |
67 | ||
68 | Called to enable or disable the over-current monitoring. | |
69 | This should claim or release the resources being used to | |
70 | check the power condition on the port, such as an IRQ. | |
71 | ||
72 | report_oc: | |
73 | ||
74 | The OHCI driver fills this field in for the over-current code | |
75 | to call when there is a change to the over-current state on | |
76 | an port. The ports argument is a bitmask of 1 bit per port, | |
77 | with bit X being 1 for an over-current on port X. | |
78 | ||
79 | The function s3c2410_usb_report_oc() has been provided to | |
80 | ensure this is called correctly. | |
81 | ||
82 | port[x]: | |
83 | ||
84 | This is struct describes each port, 0 or 1. The platform driver | |
85 | should set the flags field of each port to S3C_HCDFLG_USED if | |
86 | the port is enabled. | |
87 | ||
88 | ||
89 | ||
90 | Document Author | |
91 | --------------- | |
92 | ||
93 | Ben Dooks, (c) 2005 Simtec Electronics |