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u-boot/common/usb_hub.c
Wolfgang Grandegger a1a28c6e64 USB: relax usbcore reset timings 
Following the corresponding Linux code, this patch relaxes reset timings
waiting at least 100ms after power to the ports. There are some reports
that it helps make enumeration work better on some high speed devices.
Furthermore, the wait is only done once after power has been enabled
on all ports.

CC: Remy Bohmer <linux@bohmer.net>
CC: Vincent Palatin <vpalatin@chromium.org>
Signed-off-by: Wolfgang Grandegger <wg@denx.de>
2012-03-03 16:56:35 +01:00

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/*
*
* Most of this source has been derived from the Linux USB
* project:
* (C) Copyright Linus Torvalds 1999
* (C) Copyright Johannes Erdfelt 1999-2001
* (C) Copyright Andreas Gal 1999
* (C) Copyright Gregory P. Smith 1999
* (C) Copyright Deti Fliegl 1999 (new USB architecture)
* (C) Copyright Randy Dunlap 2000
* (C) Copyright David Brownell 2000 (kernel hotplug, usb_device_id)
* (C) Copyright Yggdrasil Computing, Inc. 2000
* (usb_device_id matching changes by Adam J. Richter)
*
* Adapted for U-Boot:
* (C) Copyright 2001 Denis Peter, MPL AG Switzerland
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*/
/****************************************************************************
* HUB "Driver"
* Probes device for being a hub and configurate it
*/
#include <common.h>
#include <command.h>
#include <asm/processor.h>
#include <linux/ctype.h>
#include <asm/byteorder.h>
#include <asm/unaligned.h>
#include <usb.h>
#ifdef CONFIG_4xx
#include <asm/4xx_pci.h>
#endif
#ifdef DEBUG
#define USB_DEBUG 1
#define USB_HUB_DEBUG 1
#else
#define USB_DEBUG 0
#define USB_HUB_DEBUG 0
#endif
#define USB_PRINTF(fmt, args...) debug_cond(USB_DEBUG, fmt, ##args)
#define USB_HUB_PRINTF(fmt, args...) debug_cond(USB_HUB_DEBUG, fmt, ##args)
#define USB_BUFSIZ 512
static struct usb_hub_device hub_dev[USB_MAX_HUB];
static int usb_hub_index;
static int usb_get_hub_descriptor(struct usb_device *dev, void *data, int size)
{
return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
USB_DT_HUB << 8, 0, data, size, USB_CNTL_TIMEOUT);
}
static int usb_clear_port_feature(struct usb_device *dev, int port, int feature)
{
return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature,
port, NULL, 0, USB_CNTL_TIMEOUT);
}
static int usb_set_port_feature(struct usb_device *dev, int port, int feature)
{
return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
USB_REQ_SET_FEATURE, USB_RT_PORT, feature,
port, NULL, 0, USB_CNTL_TIMEOUT);
}
static int usb_get_hub_status(struct usb_device *dev, void *data)
{
return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
}
static int usb_get_port_status(struct usb_device *dev, int port, void *data)
{
return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port,
data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
}
static void usb_hub_power_on(struct usb_hub_device *hub)
{
int i;
struct usb_device *dev;
unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2;
dev = hub->pusb_dev;
/* Enable power to the ports */
USB_HUB_PRINTF("enabling power on all ports\n");
for (i = 0; i < dev->maxchild; i++) {
usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
USB_HUB_PRINTF("port %d returns %lX\n", i + 1, dev->status);
}
/* Wait at least 100 msec for power to become stable */
wait_ms(max(pgood_delay, (unsigned)100));
}
void usb_hub_reset(void)
{
usb_hub_index = 0;
}
static struct usb_hub_device *usb_hub_allocate(void)
{
if (usb_hub_index < USB_MAX_HUB)
return &hub_dev[usb_hub_index++];
printf("ERROR: USB_MAX_HUB (%d) reached\n", USB_MAX_HUB);
return NULL;
}
#define MAX_TRIES 5
static inline char *portspeed(int portstatus)
{
if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
return "480 Mb/s";
else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
return "1.5 Mb/s";
else
return "12 Mb/s";
}
int hub_port_reset(struct usb_device *dev, int port,
unsigned short *portstat)
{
int tries;
struct usb_port_status portsts;
unsigned short portstatus, portchange;
USB_HUB_PRINTF("hub_port_reset: resetting port %d...\n", port);
for (tries = 0; tries < MAX_TRIES; tries++) {
usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET);
wait_ms(200);
if (usb_get_port_status(dev, port + 1, &portsts) < 0) {
USB_HUB_PRINTF("get_port_status failed status %lX\n",
dev->status);
return -1;
}
portstatus = le16_to_cpu(portsts.wPortStatus);
portchange = le16_to_cpu(portsts.wPortChange);
USB_HUB_PRINTF("portstatus %x, change %x, %s\n",
portstatus, portchange,
portspeed(portstatus));
USB_HUB_PRINTF("STAT_C_CONNECTION = %d STAT_CONNECTION = %d" \
" USB_PORT_STAT_ENABLE %d\n",
(portchange & USB_PORT_STAT_C_CONNECTION) ? 1 : 0,
(portstatus & USB_PORT_STAT_CONNECTION) ? 1 : 0,
(portstatus & USB_PORT_STAT_ENABLE) ? 1 : 0);
if ((portchange & USB_PORT_STAT_C_CONNECTION) ||
!(portstatus & USB_PORT_STAT_CONNECTION))
return -1;
if (portstatus & USB_PORT_STAT_ENABLE)
break;
wait_ms(200);
}
if (tries == MAX_TRIES) {
USB_HUB_PRINTF("Cannot enable port %i after %i retries, " \
"disabling port.\n", port + 1, MAX_TRIES);
USB_HUB_PRINTF("Maybe the USB cable is bad?\n");
return -1;
}
usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_RESET);
*portstat = portstatus;
return 0;
}
void usb_hub_port_connect_change(struct usb_device *dev, int port)
{
struct usb_device *usb;
struct usb_port_status portsts;
unsigned short portstatus;
/* Check status */
if (usb_get_port_status(dev, port + 1, &portsts) < 0) {
USB_HUB_PRINTF("get_port_status failed\n");
return;
}
portstatus = le16_to_cpu(portsts.wPortStatus);
USB_HUB_PRINTF("portstatus %x, change %x, %s\n",
portstatus,
le16_to_cpu(portsts.wPortChange),
portspeed(portstatus));
/* Clear the connection change status */
usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_CONNECTION);
/* Disconnect any existing devices under this port */
if (((!(portstatus & USB_PORT_STAT_CONNECTION)) &&
(!(portstatus & USB_PORT_STAT_ENABLE))) || (dev->children[port])) {
USB_HUB_PRINTF("usb_disconnect(&hub->children[port]);\n");
/* Return now if nothing is connected */
if (!(portstatus & USB_PORT_STAT_CONNECTION))
return;
}
wait_ms(200);
/* Reset the port */
if (hub_port_reset(dev, port, &portstatus) < 0) {
printf("cannot reset port %i!?\n", port + 1);
return;
}
wait_ms(200);
/* Allocate a new device struct for it */
usb = usb_alloc_new_device();
if (portstatus & USB_PORT_STAT_HIGH_SPEED)
usb->speed = USB_SPEED_HIGH;
else if (portstatus & USB_PORT_STAT_LOW_SPEED)
usb->speed = USB_SPEED_LOW;
else
usb->speed = USB_SPEED_FULL;
dev->children[port] = usb;
usb->parent = dev;
usb->portnr = port + 1;
/* Run it through the hoops (find a driver, etc) */
if (usb_new_device(usb)) {
/* Woops, disable the port */
USB_HUB_PRINTF("hub: disabling port %d\n", port + 1);
usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_ENABLE);
}
}
static int usb_hub_configure(struct usb_device *dev)
{
int i;
unsigned char buffer[USB_BUFSIZ], *bitmap;
struct usb_hub_descriptor *descriptor;
struct usb_hub_device *hub;
#ifdef USB_HUB_DEBUG
struct usb_hub_status *hubsts;
#endif
/* "allocate" Hub device */
hub = usb_hub_allocate();
if (hub == NULL)
return -1;
hub->pusb_dev = dev;
/* Get the the hub descriptor */
if (usb_get_hub_descriptor(dev, buffer, 4) < 0) {
USB_HUB_PRINTF("usb_hub_configure: failed to get hub " \
"descriptor, giving up %lX\n", dev->status);
return -1;
}
descriptor = (struct usb_hub_descriptor *)buffer;
/* silence compiler warning if USB_BUFSIZ is > 256 [= sizeof(char)] */
i = descriptor->bLength;
if (i > USB_BUFSIZ) {
USB_HUB_PRINTF("usb_hub_configure: failed to get hub " \
"descriptor - too long: %d\n",
descriptor->bLength);
return -1;
}
if (usb_get_hub_descriptor(dev, buffer, descriptor->bLength) < 0) {
USB_HUB_PRINTF("usb_hub_configure: failed to get hub " \
"descriptor 2nd giving up %lX\n", dev->status);
return -1;
}
memcpy((unsigned char *)&hub->desc, buffer, descriptor->bLength);
/* adjust 16bit values */
hub->desc.wHubCharacteristics =
le16_to_cpu(descriptor->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;
USB_HUB_PRINTF("%d ports detected\n", dev->maxchild);
switch (hub->desc.wHubCharacteristics & HUB_CHAR_LPSM) {
case 0x00:
USB_HUB_PRINTF("ganged power switching\n");
break;
case 0x01:
USB_HUB_PRINTF("individual port power switching\n");
break;
case 0x02:
case 0x03:
USB_HUB_PRINTF("unknown reserved power switching mode\n");
break;
}
if (hub->desc.wHubCharacteristics & HUB_CHAR_COMPOUND)
USB_HUB_PRINTF("part of a compound device\n");
else
USB_HUB_PRINTF("standalone hub\n");
switch (hub->desc.wHubCharacteristics & HUB_CHAR_OCPM) {
case 0x00:
USB_HUB_PRINTF("global over-current protection\n");
break;
case 0x08:
USB_HUB_PRINTF("individual port over-current protection\n");
break;
case 0x10:
case 0x18:
USB_HUB_PRINTF("no over-current protection\n");
break;
}
USB_HUB_PRINTF("power on to power good time: %dms\n",
descriptor->bPwrOn2PwrGood * 2);
USB_HUB_PRINTF("hub controller current requirement: %dmA\n",
descriptor->bHubContrCurrent);
for (i = 0; i < dev->maxchild; i++)
USB_HUB_PRINTF("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) {
USB_HUB_PRINTF("usb_hub_configure: failed to get Status - " \
"too long: %d\n", descriptor->bLength);
return -1;
}
if (usb_get_hub_status(dev, buffer) < 0) {
USB_HUB_PRINTF("usb_hub_configure: failed to get Status %lX\n",
dev->status);
return -1;
}
#ifdef USB_HUB_DEBUG
hubsts = (struct usb_hub_status *)buffer;
#endif
USB_HUB_PRINTF("get_hub_status returned status %X, change %X\n",
le16_to_cpu(hubsts->wHubStatus),
le16_to_cpu(hubsts->wHubChange));
USB_HUB_PRINTF("local power source is %s\n",
(le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_LOCAL_POWER) ? \
"lost (inactive)" : "good");
USB_HUB_PRINTF("%sover-current condition exists\n",
(le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_OVERCURRENT) ? \
"" : "no ");
usb_hub_power_on(hub);
for (i = 0; i < dev->maxchild; i++) {
struct usb_port_status portsts;
unsigned short portstatus, portchange;
if (usb_get_port_status(dev, i + 1, &portsts) < 0) {
USB_HUB_PRINTF("get_port_status failed\n");
continue;
}
portstatus = le16_to_cpu(portsts.wPortStatus);
portchange = le16_to_cpu(portsts.wPortChange);
USB_HUB_PRINTF("Port %d Status %X Change %X\n",
i + 1, portstatus, portchange);
if (portchange & USB_PORT_STAT_C_CONNECTION) {
USB_HUB_PRINTF("port %d connection change\n", i + 1);
usb_hub_port_connect_change(dev, i);
}
if (portchange & USB_PORT_STAT_C_ENABLE) {
USB_HUB_PRINTF("port %d enable change, status %x\n",
i + 1, portstatus);
usb_clear_port_feature(dev, i + 1,
USB_PORT_FEAT_C_ENABLE);
/* EM interference sometimes causes bad shielded USB
* devices to be shutdown by the hub, this hack enables
* them again. Works at least with mouse driver */
if (!(portstatus & USB_PORT_STAT_ENABLE) &&
(portstatus & USB_PORT_STAT_CONNECTION) &&
((dev->children[i]))) {
USB_HUB_PRINTF("already running port %i " \
"disabled by hub (EMI?), " \
"re-enabling...\n", i + 1);
usb_hub_port_connect_change(dev, i);
}
}
if (portstatus & USB_PORT_STAT_SUSPEND) {
USB_HUB_PRINTF("port %d suspend change\n", i + 1);
usb_clear_port_feature(dev, i + 1,
USB_PORT_FEAT_SUSPEND);
}
if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
USB_HUB_PRINTF("port %d over-current change\n", i + 1);
usb_clear_port_feature(dev, i + 1,
USB_PORT_FEAT_C_OVER_CURRENT);
usb_hub_power_on(hub);
}
if (portchange & USB_PORT_STAT_C_RESET) {
USB_HUB_PRINTF("port %d reset change\n", i + 1);
usb_clear_port_feature(dev, i + 1,
USB_PORT_FEAT_C_RESET);
}
} /* end for i all ports */
return 0;
}
int usb_hub_probe(struct usb_device *dev, int ifnum)
{
struct usb_interface *iface;
struct usb_endpoint_descriptor *ep;
int ret;
iface = &dev->config.if_desc[ifnum];
/* Is it a hub? */
if (iface->desc.bInterfaceClass != USB_CLASS_HUB)
return 0;
/* 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))
return 0;
/* Multiple endpoints? What kind of mutant ninja-hub is this? */
if (iface->desc.bNumEndpoints != 1)
return 0;
ep = &iface->ep_desc[0];
/* Output endpoint? Curiousier and curiousier.. */
if (!(ep->bEndpointAddress & USB_DIR_IN))
return 0;
/* If it's not an interrupt endpoint, we'd better punt! */
if ((ep->bmAttributes & 3) != 3)
return 0;
/* We found a hub */
USB_HUB_PRINTF("USB hub found\n");
ret = usb_hub_configure(dev);
return ret;
}
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