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| author | Bin Meng <bmeng.cn@gmail.com> | 2017-07-19 21:51:16 +0800 |
|---|---|---|
| committer | Marek Vasut <marex@denx.de> | 2017-07-28 23:34:34 +0200 |
| commit | 5624dfd5aa91c244519ec60b40b4a42b4d9a43ca (patch) | |
| tree | e7a0a302d46a576835159e30477071f7c599287b /include/usb.h | |
| parent | 493b8dd070f2412b49190b71b44baddbb2b24e37 (diff) | |
| download | u-boot-5624dfd5aa91c244519ec60b40b4a42b4d9a43ca.tar.gz | |
usb: hub: Parse and save TT details from device descriptor
A high speed hub has a special responsibility to handle full speed/
low speed devices connected on downstream ports. In this case, the
hub must isolate the high speed signaling environment from the full
speed/low speed signaling environment with the help of Transaction
Translator (TT). TT details are provided by hub descriptors and we
parse and save it to hub uclass_priv for later use.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'include/usb.h')
| -rw-r--r-- | include/usb.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/include/usb.h b/include/usb.h index f71da52b55..58b4549065 100644 --- a/include/usb.h +++ b/include/usb.h @@ -537,6 +537,21 @@ struct usb_hub_status { unsigned short wHubChange; } __attribute__ ((packed)); +/* + * Hub Device descriptor + * USB Hub class device protocols + */ +#define USB_HUB_PR_FS 0 /* Full speed hub */ +#define USB_HUB_PR_HS_NO_TT 0 /* Hi-speed hub without TT */ +#define USB_HUB_PR_HS_SINGLE_TT 1 /* Hi-speed hub with single TT */ +#define USB_HUB_PR_HS_MULTI_TT 2 /* Hi-speed hub with multiple TT */ +#define USB_HUB_PR_SS 3 /* Super speed hub */ + +/* Transaction Translator Think Times, in bits */ +#define HUB_TTTT_8_BITS 0x00 +#define HUB_TTTT_16_BITS 0x20 +#define HUB_TTTT_24_BITS 0x40 +#define HUB_TTTT_32_BITS 0x60 /* Hub descriptor */ struct usb_hub_descriptor { @@ -571,6 +586,7 @@ struct usb_hub_device { ulong query_delay; /* Device query delay in ms */ int overcurrent_count[USB_MAXCHILDREN]; /* Over-current counter */ int hub_depth; /* USB 3.0 hub depth */ + struct usb_tt tt; /* Transaction Translator */ }; #ifdef CONFIG_DM_USB |