diff options
| 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 | |
| parent | 493b8dd070f2412b49190b71b44baddbb2b24e37 (diff) | |
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')
| -rw-r--r-- | include/usb.h | 16 | ||||
| -rw-r--r-- | include/usb_defs.h | 12 |
2 files changed, 28 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 diff --git a/include/usb_defs.h b/include/usb_defs.h index 273337f46a..b7f2eada07 100644 --- a/include/usb_defs.h +++ b/include/usb_defs.h @@ -293,6 +293,7 @@ #define HUB_CHAR_LPSM 0x0003 #define HUB_CHAR_COMPOUND 0x0004 #define HUB_CHAR_OCPM 0x0018 +#define HUB_CHAR_TTTT 0x0060 /* TT Think Time mask */ /* * Hub Status & Hub Change bit masks @@ -310,6 +311,17 @@ #define USB_REQ_SET_HUB_DEPTH 0x0c /* + * As of USB 2.0, full/low speed devices are segregated into trees. + * One type grows from USB 1.1 host controllers (OHCI, UHCI etc). + * The other type grows from high speed hubs when they connect to + * full/low speed devices using "Transaction Translators" (TTs). + */ +struct usb_tt { + bool multi; /* true means one TT per port */ + unsigned think_time; /* think time in ns */ +}; + +/* * CBI style */ |