From 5853e1335cfc76c230cc28c4226b4d513ddb7542 Mon Sep 17 00:00:00 2001 From: Vivek Gautam Date: Sat, 14 Sep 2013 14:02:45 +0530 Subject: USB: xHCI: Add stack support for xHCI This adds stack layer for eXtensible Host Controller Interface which facilitates use of USB 3.0 in host mode. Adapting xHCI host controller driver in linux-kernel by Sarah Sharp to needs in u-boot. Initial porting from Linux kernel version 3.4, with following top commit history of drivers/usb/host/xhci* : cf84055 xHCI: Cleanup isoc transfer ring when TD length mismatch found This adds the basic xHCI host controller driver with bare minimum features: - Control/Bulk transfer support has been added with required infrastructure for necessary xHC data structures. - Stream protocol hasn't been supported yet. - No support for quirky devices has been added. Signed-off-by: Vikas C Sajjan Signed-off-by: Julius Werner Signed-off-by: Vivek Gautam Cc: Simon Glass Cc: Minkyu Kang Cc: Dan Murphy Cc: Marek Vasut --- common/usb.c | 33 +++++++++++++++++++++++++++++++-- 1 file changed, 31 insertions(+), 2 deletions(-) (limited to 'common/usb.c') diff --git a/common/usb.c b/common/usb.c index c97f522..e23d788 100644 --- a/common/usb.c +++ b/common/usb.c @@ -855,6 +855,16 @@ void usb_free_device(void) } /* + * XHCI issues Enable Slot command and thereafter + * allocates device contexts. Provide a weak alias + * function for the purpose, so that XHCI overrides it + * and EHCI/OHCI just work out of the box. + */ +__weak int usb_alloc_device(struct usb_device *udev) +{ + return 0; +} +/* * By the time we get here, the device has gotten a new device ID * and is in the default state. We need to identify the thing and * get the ball rolling.. @@ -867,6 +877,17 @@ int usb_new_device(struct usb_device *dev) int tmp; ALLOC_CACHE_ALIGN_BUFFER(unsigned char, tmpbuf, USB_BUFSIZ); + /* + * Allocate usb 3.0 device context. + * USB 3.0 (xHCI) protocol tries to allocate device slot + * and related data structures first. This call does that. + * Refer to sec 4.3.2 in xHCI spec rev1.0 + */ + if (usb_alloc_device(dev)) { + printf("Cannot allocate device context to get SLOT_ID\n"); + return -1; + } + /* We still haven't set the Address yet */ addr = dev->devnum; dev->devnum = 0; @@ -897,7 +918,7 @@ int usb_new_device(struct usb_device *dev) * http://sourceforge.net/mailarchive/forum.php? * thread_id=5729457&forum_id=5398 */ - struct usb_device_descriptor *desc; + __maybe_unused struct usb_device_descriptor *desc; int port = -1; struct usb_device *parent = dev->parent; unsigned short portstatus; @@ -914,6 +935,13 @@ int usb_new_device(struct usb_device *dev) dev->epmaxpacketin[0] = 64; dev->epmaxpacketout[0] = 64; + /* + * XHCI needs to issue a Address device command to setup + * proper device context structures, before it can interact + * with the device. So a get_descriptor will fail before any + * of that is done for XHCI unlike EHCI. + */ +#ifndef CONFIG_USB_XHCI err = usb_get_descriptor(dev, USB_DT_DEVICE, 0, desc, 64); if (err < 0) { debug("usb_new_device: usb_get_descriptor() failed\n"); @@ -926,11 +954,12 @@ int usb_new_device(struct usb_device *dev) * to differentiate between HUB and DEVICE. */ dev->descriptor.bDeviceClass = desc->bDeviceClass; +#endif - /* find the port number we're at */ if (parent) { int j; + /* find the port number we're at */ for (j = 0; j < parent->maxchild; j++) { if (parent->children[j] == dev) { port = j; -- cgit v1.1