u-boot/common/usb_hub.c
Vincent Palatin 08f3bb0bcd usb: add device connection/disconnection detection
Provide a function to detect USB device insertion/removal in order to
avoid having to do USB enumeration in a tight loop when trying to detect
peripheral hotplugging.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>

Reviewed-by: Stefan Reinauer <reinauer@chromium.org>
Tested-by: Stefan Reinauer <reinauer@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
2015-05-14 18:49:33 -06:00

658 lines
17 KiB
C

/*
* 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
*
* SPDX-License-Identifier: GPL-2.0+
*/
/****************************************************************************
* HUB "Driver"
* Probes device for being a hub and configurate it
*/
#include <common.h>
#include <command.h>
#include <dm.h>
#include <errno.h>
#include <asm/processor.h>
#include <asm/unaligned.h>
#include <linux/ctype.h>
#include <asm/byteorder.h>
#include <asm/unaligned.h>
#include <dm/root.h>
DECLARE_GLOBAL_DATA_PTR;
#include <usb.h>
#ifdef CONFIG_4xx
#include <asm/4xx_pci.h>
#endif
#define USB_BUFSIZ 512
/* TODO(sjg@chromium.org): Remove this when CONFIG_DM_USB is defined */
static struct usb_hub_device hub_dev[USB_MAX_HUB];
static int usb_hub_index;
__weak void usb_hub_reset_devices(int port)
{
return;
}
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);
}
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;
const char *env;
dev = hub->pusb_dev;
debug("enabling power on all ports\n");
for (i = 0; i < dev->maxchild; i++) {
usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
debug("port %d returns %lX\n", i + 1, dev->status);
}
/*
* Wait for power to become stable,
* plus spec-defined max time for device to connect
* but allow this time to be increased via env variable as some
* devices break the spec and require longer warm-up times
*/
env = getenv("usb_pgood_delay");
if (env)
pgood_delay = max(pgood_delay,
(unsigned)simple_strtol(env, NULL, 0));
debug("pgood_delay=%dms\n", pgood_delay);
mdelay(pgood_delay + 1000);
}
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)
{
char *speed_str;
switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
case USB_PORT_STAT_SUPER_SPEED:
speed_str = "5 Gb/s";
break;
case USB_PORT_STAT_HIGH_SPEED:
speed_str = "480 Mb/s";
break;
case USB_PORT_STAT_LOW_SPEED:
speed_str = "1.5 Mb/s";
break;
default:
speed_str = "12 Mb/s";
break;
}
return speed_str;
}
int legacy_hub_port_reset(struct usb_device *dev, int port,
unsigned short *portstat)
{
int err, tries;
ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
unsigned short portstatus, portchange;
#ifdef CONFIG_DM_USB
debug("%s: resetting '%s' port %d...\n", __func__, dev->dev->name,
port + 1);
#else
debug("%s: resetting port %d...\n", __func__, port + 1);
#endif
for (tries = 0; tries < MAX_TRIES; tries++) {
err = usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET);
if (err < 0)
return err;
mdelay(200);
if (usb_get_port_status(dev, port + 1, portsts) < 0) {
debug("get_port_status failed status %lX\n",
dev->status);
return -1;
}
portstatus = le16_to_cpu(portsts->wPortStatus);
portchange = le16_to_cpu(portsts->wPortChange);
debug("portstatus %x, change %x, %s\n", portstatus, portchange,
portspeed(portstatus));
debug("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);
/*
* Perhaps we should check for the following here:
* - C_CONNECTION hasn't been set.
* - CONNECTION is still set.
*
* Doing so would ensure that the device is still connected
* to the bus, and hasn't been unplugged or replaced while the
* USB bus reset was going on.
*
* However, if we do that, then (at least) a San Disk Ultra
* USB 3.0 16GB device fails to reset on (at least) an NVIDIA
* Tegra Jetson TK1 board. For some reason, the device appears
* to briefly drop off the bus when this second bus reset is
* executed, yet if we retry this loop, it'll eventually come
* back after another reset or two.
*/
if (portstatus & USB_PORT_STAT_ENABLE)
break;
mdelay(200);
}
if (tries == MAX_TRIES) {
debug("Cannot enable port %i after %i retries, " \
"disabling port.\n", port + 1, MAX_TRIES);
debug("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;
}
#ifdef CONFIG_DM_USB
int hub_port_reset(struct udevice *dev, int port, unsigned short *portstat)
{
struct usb_device *udev = dev_get_parentdata(dev);
return legacy_hub_port_reset(udev, port, portstat);
}
#endif
int usb_hub_port_connect_change(struct usb_device *dev, int port)
{
ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
unsigned short portstatus;
int ret, speed;
/* Check status */
ret = usb_get_port_status(dev, port + 1, portsts);
if (ret < 0) {
debug("get_port_status failed\n");
return ret;
}
portstatus = le16_to_cpu(portsts->wPortStatus);
debug("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))) ||
usb_device_has_child_on_port(dev, port)) {
debug("usb_disconnect(&hub->children[port]);\n");
/* Return now if nothing is connected */
if (!(portstatus & USB_PORT_STAT_CONNECTION))
return -ENOTCONN;
}
mdelay(200);
/* Reset the port */
ret = legacy_hub_port_reset(dev, port, &portstatus);
if (ret < 0) {
if (ret != -ENXIO)
printf("cannot reset port %i!?\n", port + 1);
return ret;
}
mdelay(200);
switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
case USB_PORT_STAT_SUPER_SPEED:
speed = USB_SPEED_SUPER;
break;
case USB_PORT_STAT_HIGH_SPEED:
speed = USB_SPEED_HIGH;
break;
case USB_PORT_STAT_LOW_SPEED:
speed = USB_SPEED_LOW;
break;
default:
speed = USB_SPEED_FULL;
break;
}
#ifdef CONFIG_DM_USB
struct udevice *child;
ret = usb_scan_device(dev->dev, port + 1, speed, &child);
#else
struct usb_device *usb;
ret = usb_alloc_new_device(dev->controller, &usb);
if (ret) {
printf("cannot create new device: ret=%d", ret);
return ret;
}
dev->children[port] = usb;
usb->speed = speed;
usb->parent = dev;
usb->portnr = port + 1;
/* Run it through the hoops (find a driver, etc) */
ret = usb_new_device(usb);
if (ret < 0) {
/* Woops, disable the port */
usb_free_device(dev->controller);
dev->children[port] = NULL;
}
#endif
if (ret < 0) {
debug("hub: disabling port %d\n", port + 1);
usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_ENABLE);
}
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);
for (i = 0; i < dev->maxchild; i++) {
ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
unsigned short portstatus, portchange;
int ret;
ulong start = get_timer(0);
#ifdef CONFIG_DM_USB
debug("\n\nScanning '%s' port %d\n", dev->dev->name, i + 1);
#else
debug("\n\nScanning port %d\n", i + 1);
#endif
/*
* Wait for (whichever finishes first)
* - A maximum of 10 seconds
* This is a purely observational value driven by connecting
* a few broken pen drives and taking the max * 1.5 approach
* - connection_change and connection state to report same
* state
*/
do {
ret = usb_get_port_status(dev, i + 1, portsts);
if (ret < 0) {
debug("get_port_status failed\n");
break;
}
portstatus = le16_to_cpu(portsts->wPortStatus);
portchange = le16_to_cpu(portsts->wPortChange);
if ((portchange & USB_PORT_STAT_C_CONNECTION) ==
(portstatus & USB_PORT_STAT_CONNECTION))
break;
} while (get_timer(start) < CONFIG_SYS_HZ * 10);
if (ret < 0)
continue;
debug("Port %d Status %X Change %X\n",
i + 1, portstatus, portchange);
if (portchange & USB_PORT_STAT_C_CONNECTION) {
debug("port %d connection change\n", i + 1);
usb_hub_port_connect_change(dev, i);
}
if (portchange & USB_PORT_STAT_C_ENABLE) {
debug("port %d enable change, status %x\n",
i + 1, portstatus);
usb_clear_port_feature(dev, i + 1,
USB_PORT_FEAT_C_ENABLE);
/*
* The following hack causes a ghost device problem
* to Faraday EHCI
*/
#ifndef CONFIG_USB_EHCI_FARADAY
/* 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) &&
usb_device_has_child_on_port(dev, i)) {
debug("already running port %i " \
"disabled by hub (EMI?), " \
"re-enabling...\n", i + 1);
usb_hub_port_connect_change(dev, i);
}
#endif
}
if (portstatus & USB_PORT_STAT_SUSPEND) {
debug("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) {
debug("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) {
debug("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;
}
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_parentdata(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 */
};
USB_DEVICE(usb_generic_hub, hub_id_table);
#endif