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https://github.com/brain-hackers/u-boot-brain
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![Stefan Roese](/assets/img/avatar_default.png)
This patch changes the USB port scanning procedure and timeout handling in the following ways: a) The power-on delay in usb_hub_power_on() is now reduced to a value of max(100ms, "hub->desc.bPwrOn2PwrGood * 2"). The code does not wait using mdelay, instead usb_hub_power_on() will wait before querying the device in the scanning loop later. The total timeout for this hub, which is 1 second + "hub->desc.bPwrOn2PwrGood * 2" is calculated and will be used in the following per-port scanning loop as the timeout to detect active USB devices on this hub. b) Don't delay the minimum delay (for power to stabilize) in usb_hub_power_on(). Instead skip querying these devices in the scannig loop until the delay time is reached. c) The ports are now scanned in a quasi parallel way. The current code did wait for each (unconnected) port to reach its timeout and only then continue with the next port. This patch now changes this to scan all ports of all USB hubs quasi simultaneously. For this, all ports are added to a scanning list. This list is scanned until all ports are ready by either a) reaching the connection timeout (calculated earlier), or by b) detecting a USB device. This results in a faster USB scan time as the recursive scanning of USB hubs connected to the hub that's currently being scanned will start earlier. One small functional change to the original code is, that ports with overcurrent detection will now get rescanned multiple times (PORT_OVERCURRENT_MAX_SCAN_COUNT). Without this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 20.163 seconds With this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 1.822 seconds So ~18.3 seconds of USB scanning time reduction. Signed-off-by: Stefan Roese <sr@denx.de> Acked-by: Hans de Goede <hdegoede@redhat.com> Tested-by: Stephen Warren <swarren@nvidia.com>
802 lines
21 KiB
C
802 lines
21 KiB
C
/*
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* Most of this source has been derived from the Linux USB
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* project:
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* (C) Copyright Linus Torvalds 1999
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* (C) Copyright Johannes Erdfelt 1999-2001
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* (C) Copyright Andreas Gal 1999
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* (C) Copyright Gregory P. Smith 1999
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* (C) Copyright Deti Fliegl 1999 (new USB architecture)
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* (C) Copyright Randy Dunlap 2000
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* (C) Copyright David Brownell 2000 (kernel hotplug, usb_device_id)
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* (C) Copyright Yggdrasil Computing, Inc. 2000
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* (usb_device_id matching changes by Adam J. Richter)
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*
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* Adapted for U-Boot:
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* (C) Copyright 2001 Denis Peter, MPL AG Switzerland
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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/****************************************************************************
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* HUB "Driver"
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* Probes device for being a hub and configurate it
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*/
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#include <common.h>
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#include <command.h>
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#include <dm.h>
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#include <errno.h>
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#include <memalign.h>
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#include <asm/processor.h>
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#include <asm/unaligned.h>
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#include <linux/ctype.h>
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#include <linux/list.h>
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#include <asm/byteorder.h>
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#ifdef CONFIG_SANDBOX
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#include <asm/state.h>
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#endif
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#include <asm/unaligned.h>
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#include <dm/root.h>
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DECLARE_GLOBAL_DATA_PTR;
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#include <usb.h>
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#ifdef CONFIG_4xx
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#include <asm/4xx_pci.h>
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#endif
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#define USB_BUFSIZ 512
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#define HUB_SHORT_RESET_TIME 20
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#define HUB_LONG_RESET_TIME 200
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#define PORT_OVERCURRENT_MAX_SCAN_COUNT 3
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struct usb_device_scan {
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struct usb_device *dev; /* USB hub device to scan */
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struct usb_hub_device *hub; /* USB hub struct */
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int port; /* USB port to scan */
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struct list_head list;
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};
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/* TODO(sjg@chromium.org): Remove this when CONFIG_DM_USB is defined */
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static struct usb_hub_device hub_dev[USB_MAX_HUB];
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static int usb_hub_index;
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static LIST_HEAD(usb_scan_list);
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__weak void usb_hub_reset_devices(int port)
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{
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return;
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}
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static int usb_get_hub_descriptor(struct usb_device *dev, void *data, int size)
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{
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return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
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USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
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USB_DT_HUB << 8, 0, data, size, USB_CNTL_TIMEOUT);
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}
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static int usb_clear_port_feature(struct usb_device *dev, int port, int feature)
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{
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return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
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USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature,
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port, NULL, 0, USB_CNTL_TIMEOUT);
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}
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static int usb_set_port_feature(struct usb_device *dev, int port, int feature)
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{
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return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
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USB_REQ_SET_FEATURE, USB_RT_PORT, feature,
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port, NULL, 0, USB_CNTL_TIMEOUT);
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}
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static int usb_get_hub_status(struct usb_device *dev, void *data)
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{
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return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
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USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
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data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
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}
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int usb_get_port_status(struct usb_device *dev, int port, void *data)
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{
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return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
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USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port,
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data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
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}
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static void usb_hub_power_on(struct usb_hub_device *hub)
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{
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int i;
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struct usb_device *dev;
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unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2;
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const char *env;
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dev = hub->pusb_dev;
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debug("enabling power on all ports\n");
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for (i = 0; i < dev->maxchild; i++) {
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usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
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debug("port %d returns %lX\n", i + 1, dev->status);
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}
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#ifdef CONFIG_SANDBOX
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/*
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* Don't set timeout / delay values here. This results
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* in these values still being reset to 0.
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*/
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if (state_get_skip_delays())
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return;
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#endif
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/*
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* Wait for power to become stable,
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* plus spec-defined max time for device to connect
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* but allow this time to be increased via env variable as some
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* devices break the spec and require longer warm-up times
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*/
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env = getenv("usb_pgood_delay");
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if (env)
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pgood_delay = max(pgood_delay,
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(unsigned)simple_strtol(env, NULL, 0));
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debug("pgood_delay=%dms\n", pgood_delay);
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/*
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* Do a minimum delay of the larger value of 100ms or pgood_delay
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* so that the power can stablize before the devices are queried
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*/
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hub->query_delay = get_timer(0) + max(100, (int)pgood_delay);
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/*
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* Record the power-on timeout here. The max. delay (timeout)
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* will be done based on this value in the USB port loop in
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* usb_hub_configure() later.
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*/
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hub->connect_timeout = hub->query_delay + 1000;
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debug("devnum=%d poweron: query_delay=%d connect_timeout=%d\n",
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dev->devnum, max(100, (int)pgood_delay),
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max(100, (int)pgood_delay) + 1000);
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}
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void usb_hub_reset(void)
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{
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usb_hub_index = 0;
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/* Zero out global hub_dev in case its re-used again */
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memset(hub_dev, 0, sizeof(hub_dev));
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}
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static struct usb_hub_device *usb_hub_allocate(void)
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{
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if (usb_hub_index < USB_MAX_HUB)
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return &hub_dev[usb_hub_index++];
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printf("ERROR: USB_MAX_HUB (%d) reached\n", USB_MAX_HUB);
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return NULL;
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}
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#define MAX_TRIES 5
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static inline char *portspeed(int portstatus)
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{
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char *speed_str;
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switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
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case USB_PORT_STAT_SUPER_SPEED:
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speed_str = "5 Gb/s";
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break;
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case USB_PORT_STAT_HIGH_SPEED:
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speed_str = "480 Mb/s";
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break;
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case USB_PORT_STAT_LOW_SPEED:
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speed_str = "1.5 Mb/s";
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break;
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default:
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speed_str = "12 Mb/s";
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break;
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}
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return speed_str;
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}
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int legacy_hub_port_reset(struct usb_device *dev, int port,
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unsigned short *portstat)
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{
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int err, tries;
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ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
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unsigned short portstatus, portchange;
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int delay = HUB_SHORT_RESET_TIME; /* start with short reset delay */
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#ifdef CONFIG_DM_USB
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debug("%s: resetting '%s' port %d...\n", __func__, dev->dev->name,
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port + 1);
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#else
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debug("%s: resetting port %d...\n", __func__, port + 1);
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#endif
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for (tries = 0; tries < MAX_TRIES; tries++) {
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err = usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET);
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if (err < 0)
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return err;
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mdelay(delay);
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if (usb_get_port_status(dev, port + 1, portsts) < 0) {
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debug("get_port_status failed status %lX\n",
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dev->status);
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return -1;
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}
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portstatus = le16_to_cpu(portsts->wPortStatus);
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portchange = le16_to_cpu(portsts->wPortChange);
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debug("portstatus %x, change %x, %s\n", portstatus, portchange,
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portspeed(portstatus));
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debug("STAT_C_CONNECTION = %d STAT_CONNECTION = %d" \
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" USB_PORT_STAT_ENABLE %d\n",
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(portchange & USB_PORT_STAT_C_CONNECTION) ? 1 : 0,
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(portstatus & USB_PORT_STAT_CONNECTION) ? 1 : 0,
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(portstatus & USB_PORT_STAT_ENABLE) ? 1 : 0);
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/*
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* Perhaps we should check for the following here:
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* - C_CONNECTION hasn't been set.
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* - CONNECTION is still set.
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*
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* Doing so would ensure that the device is still connected
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* to the bus, and hasn't been unplugged or replaced while the
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* USB bus reset was going on.
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*
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* However, if we do that, then (at least) a San Disk Ultra
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* USB 3.0 16GB device fails to reset on (at least) an NVIDIA
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* Tegra Jetson TK1 board. For some reason, the device appears
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* to briefly drop off the bus when this second bus reset is
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* executed, yet if we retry this loop, it'll eventually come
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* back after another reset or two.
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*/
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if (portstatus & USB_PORT_STAT_ENABLE)
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break;
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/* Switch to long reset delay for the next round */
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delay = HUB_LONG_RESET_TIME;
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}
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if (tries == MAX_TRIES) {
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debug("Cannot enable port %i after %i retries, " \
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"disabling port.\n", port + 1, MAX_TRIES);
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debug("Maybe the USB cable is bad?\n");
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return -1;
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}
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usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_RESET);
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*portstat = portstatus;
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return 0;
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}
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#ifdef CONFIG_DM_USB
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int hub_port_reset(struct udevice *dev, int port, unsigned short *portstat)
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{
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struct usb_device *udev = dev_get_parent_priv(dev);
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return legacy_hub_port_reset(udev, port, portstat);
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}
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#endif
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int usb_hub_port_connect_change(struct usb_device *dev, int port)
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{
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ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
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unsigned short portstatus;
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int ret, speed;
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/* Check status */
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ret = usb_get_port_status(dev, port + 1, portsts);
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if (ret < 0) {
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debug("get_port_status failed\n");
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return ret;
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}
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portstatus = le16_to_cpu(portsts->wPortStatus);
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debug("portstatus %x, change %x, %s\n",
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portstatus,
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le16_to_cpu(portsts->wPortChange),
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portspeed(portstatus));
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/* Clear the connection change status */
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usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_CONNECTION);
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/* Disconnect any existing devices under this port */
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if (((!(portstatus & USB_PORT_STAT_CONNECTION)) &&
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(!(portstatus & USB_PORT_STAT_ENABLE))) ||
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usb_device_has_child_on_port(dev, port)) {
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debug("usb_disconnect(&hub->children[port]);\n");
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/* Return now if nothing is connected */
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if (!(portstatus & USB_PORT_STAT_CONNECTION))
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return -ENOTCONN;
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}
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/* Reset the port */
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ret = legacy_hub_port_reset(dev, port, &portstatus);
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if (ret < 0) {
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if (ret != -ENXIO)
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printf("cannot reset port %i!?\n", port + 1);
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return ret;
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}
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switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
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case USB_PORT_STAT_SUPER_SPEED:
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speed = USB_SPEED_SUPER;
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break;
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case USB_PORT_STAT_HIGH_SPEED:
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speed = USB_SPEED_HIGH;
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break;
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case USB_PORT_STAT_LOW_SPEED:
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speed = USB_SPEED_LOW;
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break;
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default:
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speed = USB_SPEED_FULL;
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break;
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}
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#ifdef CONFIG_DM_USB
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struct udevice *child;
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ret = usb_scan_device(dev->dev, port + 1, speed, &child);
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#else
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struct usb_device *usb;
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ret = usb_alloc_new_device(dev->controller, &usb);
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if (ret) {
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printf("cannot create new device: ret=%d", ret);
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return ret;
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}
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dev->children[port] = usb;
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usb->speed = speed;
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usb->parent = dev;
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usb->portnr = port + 1;
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/* Run it through the hoops (find a driver, etc) */
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ret = usb_new_device(usb);
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if (ret < 0) {
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/* Woops, disable the port */
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usb_free_device(dev->controller);
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dev->children[port] = NULL;
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}
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#endif
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if (ret < 0) {
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debug("hub: disabling port %d\n", port + 1);
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usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_ENABLE);
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}
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return ret;
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}
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static int usb_scan_port(struct usb_device_scan *usb_scan)
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{
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ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
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unsigned short portstatus;
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unsigned short portchange;
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struct usb_device *dev;
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struct usb_hub_device *hub;
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int ret = 0;
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int i;
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dev = usb_scan->dev;
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hub = usb_scan->hub;
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i = usb_scan->port;
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/*
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* Don't talk to the device before the query delay is expired.
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* This is needed for voltages to stabalize.
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*/
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if (get_timer(0) < hub->query_delay)
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return 0;
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ret = usb_get_port_status(dev, i + 1, portsts);
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if (ret < 0) {
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debug("get_port_status failed\n");
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if (get_timer(0) >= hub->connect_timeout) {
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debug("devnum=%d port=%d: timeout\n",
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dev->devnum, i + 1);
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/* Remove this device from scanning list */
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list_del(&usb_scan->list);
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free(usb_scan);
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return 0;
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}
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}
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portstatus = le16_to_cpu(portsts->wPortStatus);
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portchange = le16_to_cpu(portsts->wPortChange);
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debug("Port %d Status %X Change %X\n", i + 1, portstatus, portchange);
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/* No connection change happened, wait a bit more. */
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if (!(portchange & USB_PORT_STAT_C_CONNECTION)) {
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if (get_timer(0) >= hub->connect_timeout) {
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debug("devnum=%d port=%d: timeout\n",
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dev->devnum, i + 1);
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/* Remove this device from scanning list */
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list_del(&usb_scan->list);
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free(usb_scan);
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return 0;
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}
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return 0;
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}
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/* Test if the connection came up, and if not exit */
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if (!(portstatus & USB_PORT_STAT_CONNECTION))
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return 0;
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/* A new USB device is ready at this point */
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debug("devnum=%d port=%d: USB dev found\n", dev->devnum, i + 1);
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usb_hub_port_connect_change(dev, i);
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if (portchange & USB_PORT_STAT_C_ENABLE) {
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debug("port %d enable change, status %x\n", i + 1, portstatus);
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usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_ENABLE);
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/*
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* The following hack causes a ghost device problem
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* to Faraday EHCI
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*/
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#ifndef CONFIG_USB_EHCI_FARADAY
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/*
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* EM interference sometimes causes bad shielded USB
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* devices to be shutdown by the hub, this hack enables
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* them again. Works at least with mouse driver
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*/
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if (!(portstatus & USB_PORT_STAT_ENABLE) &&
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(portstatus & USB_PORT_STAT_CONNECTION) &&
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usb_device_has_child_on_port(dev, i)) {
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debug("already running port %i disabled by hub (EMI?), re-enabling...\n",
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i + 1);
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usb_hub_port_connect_change(dev, i);
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}
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#endif
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}
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if (portstatus & USB_PORT_STAT_SUSPEND) {
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debug("port %d suspend change\n", i + 1);
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usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_SUSPEND);
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}
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if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
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debug("port %d over-current change\n", i + 1);
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usb_clear_port_feature(dev, i + 1,
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USB_PORT_FEAT_C_OVER_CURRENT);
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/* Only power-on this one port */
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usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
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hub->overcurrent_count[i]++;
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/*
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* If the max-scan-count is not reached, return without removing
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|
* the device from scan-list. This will re-issue a new scan.
|
|
*/
|
|
if (hub->overcurrent_count[i] <=
|
|
PORT_OVERCURRENT_MAX_SCAN_COUNT)
|
|
return 0;
|
|
|
|
/* Otherwise the device will get removed */
|
|
printf("Port %d over-current occured %d times\n", i + 1,
|
|
hub->overcurrent_count[i]);
|
|
}
|
|
|
|
if (portchange & USB_PORT_STAT_C_RESET) {
|
|
debug("port %d reset change\n", i + 1);
|
|
usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_RESET);
|
|
}
|
|
|
|
/*
|
|
* We're done with this device, so let's remove this device from
|
|
* scanning list
|
|
*/
|
|
list_del(&usb_scan->list);
|
|
free(usb_scan);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int usb_device_list_scan(void)
|
|
{
|
|
struct usb_device_scan *usb_scan;
|
|
struct usb_device_scan *tmp;
|
|
static int running;
|
|
int ret = 0;
|
|
|
|
/* Only run this loop once for each controller */
|
|
if (running)
|
|
return 0;
|
|
|
|
running = 1;
|
|
|
|
while (1) {
|
|
/* We're done, once the list is empty again */
|
|
if (list_empty(&usb_scan_list))
|
|
goto out;
|
|
|
|
list_for_each_entry_safe(usb_scan, tmp, &usb_scan_list, list) {
|
|
int ret;
|
|
|
|
/* Scan this port */
|
|
ret = usb_scan_port(usb_scan);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
out:
|
|
/*
|
|
* This USB controller has finished scanning all its connected
|
|
* USB devices. Set "running" back to 0, so that other USB controllers
|
|
* will scan their devices too.
|
|
*/
|
|
running = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int usb_hub_configure(struct usb_device *dev)
|
|
{
|
|
int i, length;
|
|
ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, USB_BUFSIZ);
|
|
unsigned char *bitmap;
|
|
short hubCharacteristics;
|
|
struct usb_hub_descriptor *descriptor;
|
|
struct usb_hub_device *hub;
|
|
__maybe_unused struct usb_hub_status *hubsts;
|
|
int ret;
|
|
|
|
/* "allocate" Hub device */
|
|
hub = usb_hub_allocate();
|
|
if (hub == NULL)
|
|
return -ENOMEM;
|
|
hub->pusb_dev = dev;
|
|
/* Get the the hub descriptor */
|
|
ret = usb_get_hub_descriptor(dev, buffer, 4);
|
|
if (ret < 0) {
|
|
debug("usb_hub_configure: failed to get hub " \
|
|
"descriptor, giving up %lX\n", dev->status);
|
|
return ret;
|
|
}
|
|
descriptor = (struct usb_hub_descriptor *)buffer;
|
|
|
|
length = min_t(int, descriptor->bLength,
|
|
sizeof(struct usb_hub_descriptor));
|
|
|
|
ret = usb_get_hub_descriptor(dev, buffer, length);
|
|
if (ret < 0) {
|
|
debug("usb_hub_configure: failed to get hub " \
|
|
"descriptor 2nd giving up %lX\n", dev->status);
|
|
return ret;
|
|
}
|
|
memcpy((unsigned char *)&hub->desc, buffer, length);
|
|
/* adjust 16bit values */
|
|
put_unaligned(le16_to_cpu(get_unaligned(
|
|
&descriptor->wHubCharacteristics)),
|
|
&hub->desc.wHubCharacteristics);
|
|
/* set the bitmap */
|
|
bitmap = (unsigned char *)&hub->desc.DeviceRemovable[0];
|
|
/* devices not removable by default */
|
|
memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8);
|
|
bitmap = (unsigned char *)&hub->desc.PortPowerCtrlMask[0];
|
|
memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8); /* PowerMask = 1B */
|
|
|
|
for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
|
|
hub->desc.DeviceRemovable[i] = descriptor->DeviceRemovable[i];
|
|
|
|
for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
|
|
hub->desc.PortPowerCtrlMask[i] = descriptor->PortPowerCtrlMask[i];
|
|
|
|
dev->maxchild = descriptor->bNbrPorts;
|
|
debug("%d ports detected\n", dev->maxchild);
|
|
|
|
hubCharacteristics = get_unaligned(&hub->desc.wHubCharacteristics);
|
|
switch (hubCharacteristics & HUB_CHAR_LPSM) {
|
|
case 0x00:
|
|
debug("ganged power switching\n");
|
|
break;
|
|
case 0x01:
|
|
debug("individual port power switching\n");
|
|
break;
|
|
case 0x02:
|
|
case 0x03:
|
|
debug("unknown reserved power switching mode\n");
|
|
break;
|
|
}
|
|
|
|
if (hubCharacteristics & HUB_CHAR_COMPOUND)
|
|
debug("part of a compound device\n");
|
|
else
|
|
debug("standalone hub\n");
|
|
|
|
switch (hubCharacteristics & HUB_CHAR_OCPM) {
|
|
case 0x00:
|
|
debug("global over-current protection\n");
|
|
break;
|
|
case 0x08:
|
|
debug("individual port over-current protection\n");
|
|
break;
|
|
case 0x10:
|
|
case 0x18:
|
|
debug("no over-current protection\n");
|
|
break;
|
|
}
|
|
|
|
debug("power on to power good time: %dms\n",
|
|
descriptor->bPwrOn2PwrGood * 2);
|
|
debug("hub controller current requirement: %dmA\n",
|
|
descriptor->bHubContrCurrent);
|
|
|
|
for (i = 0; i < dev->maxchild; i++)
|
|
debug("port %d is%s removable\n", i + 1,
|
|
hub->desc.DeviceRemovable[(i + 1) / 8] & \
|
|
(1 << ((i + 1) % 8)) ? " not" : "");
|
|
|
|
if (sizeof(struct usb_hub_status) > USB_BUFSIZ) {
|
|
debug("usb_hub_configure: failed to get Status - " \
|
|
"too long: %d\n", descriptor->bLength);
|
|
return -EFBIG;
|
|
}
|
|
|
|
ret = usb_get_hub_status(dev, buffer);
|
|
if (ret < 0) {
|
|
debug("usb_hub_configure: failed to get Status %lX\n",
|
|
dev->status);
|
|
return ret;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
hubsts = (struct usb_hub_status *)buffer;
|
|
#endif
|
|
|
|
debug("get_hub_status returned status %X, change %X\n",
|
|
le16_to_cpu(hubsts->wHubStatus),
|
|
le16_to_cpu(hubsts->wHubChange));
|
|
debug("local power source is %s\n",
|
|
(le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_LOCAL_POWER) ? \
|
|
"lost (inactive)" : "good");
|
|
debug("%sover-current condition exists\n",
|
|
(le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_OVERCURRENT) ? \
|
|
"" : "no ");
|
|
usb_hub_power_on(hub);
|
|
|
|
/*
|
|
* Reset any devices that may be in a bad state when applying
|
|
* the power. This is a __weak function. Resetting of the devices
|
|
* should occur in the board file of the device.
|
|
*/
|
|
for (i = 0; i < dev->maxchild; i++)
|
|
usb_hub_reset_devices(i + 1);
|
|
|
|
/*
|
|
* Only add the connected USB devices, including potential hubs,
|
|
* to a scanning list. This list will get scanned and devices that
|
|
* are detected (either via port connected or via port timeout)
|
|
* will get removed from this list. Scanning of the devices on this
|
|
* list will continue until all devices are removed.
|
|
*/
|
|
for (i = 0; i < dev->maxchild; i++) {
|
|
struct usb_device_scan *usb_scan;
|
|
|
|
usb_scan = calloc(1, sizeof(*usb_scan));
|
|
if (!usb_scan) {
|
|
printf("Can't allocate memory for USB device!\n");
|
|
return -ENOMEM;
|
|
}
|
|
usb_scan->dev = dev;
|
|
usb_scan->hub = hub;
|
|
usb_scan->port = i;
|
|
list_add_tail(&usb_scan->list, &usb_scan_list);
|
|
}
|
|
|
|
/*
|
|
* And now call the scanning code which loops over the generated list
|
|
*/
|
|
ret = usb_device_list_scan();
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int usb_hub_check(struct usb_device *dev, int ifnum)
|
|
{
|
|
struct usb_interface *iface;
|
|
struct usb_endpoint_descriptor *ep = NULL;
|
|
|
|
iface = &dev->config.if_desc[ifnum];
|
|
/* Is it a hub? */
|
|
if (iface->desc.bInterfaceClass != USB_CLASS_HUB)
|
|
goto err;
|
|
/* Some hubs have a subclass of 1, which AFAICT according to the */
|
|
/* specs is not defined, but it works */
|
|
if ((iface->desc.bInterfaceSubClass != 0) &&
|
|
(iface->desc.bInterfaceSubClass != 1))
|
|
goto err;
|
|
/* Multiple endpoints? What kind of mutant ninja-hub is this? */
|
|
if (iface->desc.bNumEndpoints != 1)
|
|
goto err;
|
|
ep = &iface->ep_desc[0];
|
|
/* Output endpoint? Curiousier and curiousier.. */
|
|
if (!(ep->bEndpointAddress & USB_DIR_IN))
|
|
goto err;
|
|
/* If it's not an interrupt endpoint, we'd better punt! */
|
|
if ((ep->bmAttributes & 3) != 3)
|
|
goto err;
|
|
/* We found a hub */
|
|
debug("USB hub found\n");
|
|
return 0;
|
|
|
|
err:
|
|
debug("USB hub not found: bInterfaceClass=%d, bInterfaceSubClass=%d, bNumEndpoints=%d\n",
|
|
iface->desc.bInterfaceClass, iface->desc.bInterfaceSubClass,
|
|
iface->desc.bNumEndpoints);
|
|
if (ep) {
|
|
debug(" bEndpointAddress=%#x, bmAttributes=%d",
|
|
ep->bEndpointAddress, ep->bmAttributes);
|
|
}
|
|
|
|
return -ENOENT;
|
|
}
|
|
|
|
int usb_hub_probe(struct usb_device *dev, int ifnum)
|
|
{
|
|
int ret;
|
|
|
|
ret = usb_hub_check(dev, ifnum);
|
|
if (ret)
|
|
return 0;
|
|
ret = usb_hub_configure(dev);
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_DM_USB
|
|
int usb_hub_scan(struct udevice *hub)
|
|
{
|
|
struct usb_device *udev = dev_get_parent_priv(hub);
|
|
|
|
return usb_hub_configure(udev);
|
|
}
|
|
|
|
static int usb_hub_post_bind(struct udevice *dev)
|
|
{
|
|
/* Scan the bus for devices */
|
|
return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
|
|
}
|
|
|
|
static int usb_hub_post_probe(struct udevice *dev)
|
|
{
|
|
debug("%s\n", __func__);
|
|
return usb_hub_scan(dev);
|
|
}
|
|
|
|
static const struct udevice_id usb_hub_ids[] = {
|
|
{ .compatible = "usb-hub" },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(usb_generic_hub) = {
|
|
.name = "usb_hub",
|
|
.id = UCLASS_USB_HUB,
|
|
.of_match = usb_hub_ids,
|
|
.flags = DM_FLAG_ALLOC_PRIV_DMA,
|
|
};
|
|
|
|
UCLASS_DRIVER(usb_hub) = {
|
|
.id = UCLASS_USB_HUB,
|
|
.name = "usb_hub",
|
|
.post_bind = usb_hub_post_bind,
|
|
.post_probe = usb_hub_post_probe,
|
|
.child_pre_probe = usb_child_pre_probe,
|
|
.per_child_auto_alloc_size = sizeof(struct usb_device),
|
|
.per_child_platdata_auto_alloc_size = sizeof(struct usb_dev_platdata),
|
|
};
|
|
|
|
static const struct usb_device_id hub_id_table[] = {
|
|
{
|
|
.match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
|
|
.bDeviceClass = USB_CLASS_HUB
|
|
},
|
|
{ } /* Terminating entry */
|
|
};
|
|
|
|
U_BOOT_USB_DEVICE(usb_generic_hub, hub_id_table);
|
|
|
|
#endif
|