u-boot/drivers/usb/host/usb-uclass.c
Simon Glass de31213fb8 dm: usb: Add a uclass for USB controllers
Add a uclass that can represent a USB controller. For now we do not create
devices for things attached to the controller. This will be added later.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Marek Vasut <marex@denx.de>
2015-04-18 11:11:20 -06:00

392 lines
9.6 KiB
C

/*
* (C) Copyright 2015 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <usb.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <dm/root.h>
#include <dm/uclass-internal.h>
DECLARE_GLOBAL_DATA_PTR;
extern bool usb_started; /* flag for the started/stopped USB status */
static bool asynch_allowed;
int usb_disable_asynch(int disable)
{
int old_value = asynch_allowed;
asynch_allowed = !disable;
return old_value;
}
int submit_int_msg(struct usb_device *udev, unsigned long pipe, void *buffer,
int length, int interval)
{
struct udevice *bus = udev->controller_dev;
struct dm_usb_ops *ops = usb_get_ops(bus);
if (!ops->interrupt)
return -ENOSYS;
return ops->interrupt(bus, udev, pipe, buffer, length, interval);
}
int submit_control_msg(struct usb_device *udev, unsigned long pipe,
void *buffer, int length, struct devrequest *setup)
{
struct udevice *bus = udev->controller_dev;
struct dm_usb_ops *ops = usb_get_ops(bus);
if (!ops->control)
return -ENOSYS;
return ops->control(bus, udev, pipe, buffer, length, setup);
}
int submit_bulk_msg(struct usb_device *udev, unsigned long pipe, void *buffer,
int length)
{
struct udevice *bus = udev->controller_dev;
struct dm_usb_ops *ops = usb_get_ops(bus);
if (!ops->bulk)
return -ENOSYS;
return ops->bulk(bus, udev, pipe, buffer, length);
}
int usb_alloc_device(struct usb_device *udev)
{
struct udevice *bus = udev->controller_dev;
struct dm_usb_ops *ops = usb_get_ops(bus);
/* This is only requird by some controllers - current XHCI */
if (!ops->alloc_device)
return 0;
return ops->alloc_device(bus, udev);
}
int usb_stop(void)
{
struct udevice *bus;
struct uclass *uc;
int err = 0, ret;
/* De-activate any devices that have been activated */
ret = uclass_get(UCLASS_USB, &uc);
if (ret)
return ret;
uclass_foreach_dev(bus, uc) {
ret = device_remove(bus);
if (ret && !err)
err = ret;
}
usb_stor_reset();
usb_hub_reset();
usb_started = 0;
return err;
}
static int usb_scan_bus(struct udevice *bus, bool recurse)
{
struct usb_bus_priv *priv;
struct udevice *dev;
int ret;
priv = dev_get_uclass_priv(bus);
assert(recurse); /* TODO: Support non-recusive */
ret = usb_scan_device(bus, 0, USB_SPEED_FULL, &dev);
if (ret)
return ret;
return priv->next_addr;
}
int usb_init(void)
{
int controllers_initialized = 0;
struct udevice *bus;
struct uclass *uc;
int count = 0;
int ret;
asynch_allowed = 1;
usb_hub_reset();
ret = uclass_get(UCLASS_USB, &uc);
if (ret)
return ret;
uclass_foreach_dev(bus, uc) {
/* init low_level USB */
count++;
printf("USB");
printf("%d: ", bus->seq);
ret = device_probe(bus);
if (ret == -ENODEV) { /* No such device. */
puts("Port not available.\n");
controllers_initialized++;
continue;
}
if (ret) { /* Other error. */
printf("probe failed, error %d\n", ret);
continue;
}
/*
* lowlevel init is OK, now scan the bus for devices
* i.e. search HUBs and configure them
*/
controllers_initialized++;
printf("scanning bus %d for devices... ", bus->seq);
debug("\n");
ret = usb_scan_bus(bus, true);
if (ret < 0)
printf("failed, error %d\n", ret);
else if (!ret)
printf("No USB Device found\n");
else
printf("%d USB Device(s) found\n", ret);
usb_started = true;
}
debug("scan end\n");
/* if we were not able to find at least one working bus, bail out */
if (!count)
printf("No controllers found\n");
else if (controllers_initialized == 0)
printf("USB error: all controllers failed lowlevel init\n");
return usb_started ? 0 : -1;
}
int usb_reset_root_port(void)
{
return -ENOSYS;
}
static struct usb_device *find_child_devnum(struct udevice *parent, int devnum)
{
struct usb_device *udev;
struct udevice *dev;
if (!device_active(parent))
return NULL;
udev = dev_get_parentdata(parent);
if (udev->devnum == devnum)
return udev;
for (device_find_first_child(parent, &dev);
dev;
device_find_next_child(&dev)) {
udev = find_child_devnum(dev, devnum);
if (udev)
return udev;
}
return NULL;
}
struct usb_device *usb_get_dev_index(struct udevice *bus, int index)
{
struct udevice *hub;
int devnum = index + 1; /* Addresses are allocated from 1 on USB */
device_find_first_child(bus, &hub);
if (device_get_uclass_id(hub) == UCLASS_USB_HUB)
return find_child_devnum(hub, devnum);
return NULL;
}
int usb_post_bind(struct udevice *dev)
{
/* Scan the bus for devices */
return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
}
int usb_port_reset(struct usb_device *parent, int portnr)
{
unsigned short portstatus;
int ret;
debug("%s: start\n", __func__);
if (parent) {
/* reset the port for the second time */
assert(portnr > 0);
debug("%s: reset %d\n", __func__, portnr - 1);
ret = legacy_hub_port_reset(parent, portnr - 1, &portstatus);
if (ret < 0) {
printf("\n Couldn't reset port %i\n", portnr);
return ret;
}
} else {
debug("%s: reset root\n", __func__);
usb_reset_root_port();
}
return 0;
}
int usb_legacy_port_reset(struct usb_device *parent, int portnr)
{
return usb_port_reset(parent, portnr);
}
int usb_scan_device(struct udevice *parent, int port,
enum usb_device_speed speed, struct udevice **devp)
{
struct udevice *dev;
bool created = false;
struct usb_dev_platdata *plat;
struct usb_bus_priv *priv;
struct usb_device *parent_udev;
int ret;
ALLOC_CACHE_ALIGN_BUFFER(struct usb_device, udev, 1);
struct usb_interface_descriptor *iface = &udev->config.if_desc[0].desc;
*devp = NULL;
memset(udev, '\0', sizeof(*udev));
ret = usb_get_bus(parent, &udev->controller_dev);
if (ret)
return ret;
priv = dev_get_uclass_priv(udev->controller_dev);
/*
* Somewhat nasty, this. We create a local device and use the normal
* USB stack to read its descriptor. Then we know what type of device
* to create for real.
*
* udev->dev is set to the parent, since we don't have a real device
* yet. The USB stack should not access udev.dev anyway, except perhaps
* to find the controller, and the controller will either be @parent,
* or some parent of @parent.
*
* Another option might be to create the device as a generic USB
* device, then morph it into the correct one when we know what it
* should be. This means that a generic USB device would morph into
* a network controller, or a USB flash stick, for example. However,
* we don't support such morphing and it isn't clear that it would
* be easy to do.
*
* Yet another option is to split out the USB stack parts of udev
* into something like a 'struct urb' (as Linux does) which can exist
* independently of any device. This feels cleaner, but calls for quite
* a big change to the USB stack.
*
* For now, the approach is to set up an empty udev, read its
* descriptor and assign it an address, then bind a real device and
* stash the resulting information into the device's parent
* platform data. Then when we probe it, usb_child_pre_probe() is called
* and it will pull the information out of the stash.
*/
udev->dev = parent;
udev->speed = speed;
udev->devnum = priv->next_addr + 1;
udev->portnr = port;
debug("Calling usb_setup_device(), portnr=%d\n", udev->portnr);
parent_udev = device_get_uclass_id(parent) == UCLASS_USB_HUB ?
dev_get_parentdata(parent) : NULL;
ret = usb_setup_device(udev, priv->desc_before_addr, parent_udev, port);
debug("read_descriptor for '%s': ret=%d\n", parent->name, ret);
if (ret)
return ret;
ret = usb_find_child(parent, &udev->descriptor, iface, &dev);
debug("** usb_find_child returns %d\n", ret);
/* TODO: Find a suitable driver and create the device */
return -ENOENT;
}
int usb_child_post_bind(struct udevice *dev)
{
struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
const void *blob = gd->fdt_blob;
int val;
if (dev->of_offset == -1)
return 0;
/* We only support matching a few things */
val = fdtdec_get_int(blob, dev->of_offset, "usb,device-class", -1);
if (val != -1) {
plat->id.match_flags |= USB_DEVICE_ID_MATCH_DEV_CLASS;
plat->id.bDeviceClass = val;
}
val = fdtdec_get_int(blob, dev->of_offset, "usb,interface-class", -1);
if (val != -1) {
plat->id.match_flags |= USB_DEVICE_ID_MATCH_INT_CLASS;
plat->id.bInterfaceClass = val;
}
return 0;
}
int usb_get_bus(struct udevice *dev, struct udevice **busp)
{
struct udevice *bus;
*busp = NULL;
for (bus = dev; bus && device_get_uclass_id(bus) != UCLASS_USB; )
bus = bus->parent;
if (!bus) {
/* By design this cannot happen */
assert(bus);
debug("USB HUB '%s' does not have a controller\n", dev->name);
return -EXDEV;
}
*busp = bus;
return 0;
}
int usb_child_pre_probe(struct udevice *dev)
{
struct udevice *bus;
struct usb_device *udev = dev_get_parentdata(dev);
struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
int ret;
ret = usb_get_bus(dev, &bus);
if (ret)
return ret;
udev->controller_dev = bus;
udev->dev = dev;
udev->devnum = plat->devnum;
udev->slot_id = plat->slot_id;
udev->portnr = plat->portnr;
udev->speed = plat->speed;
debug("** device '%s': getting slot_id=%d\n", dev->name, plat->slot_id);
ret = usb_select_config(udev);
if (ret)
return ret;
return 0;
}
UCLASS_DRIVER(usb) = {
.id = UCLASS_USB,
.name = "usb",
.flags = DM_UC_FLAG_SEQ_ALIAS,
.post_bind = usb_post_bind,
.per_child_auto_alloc_size = sizeof(struct usb_device),
.per_device_auto_alloc_size = sizeof(struct usb_bus_priv),
.child_post_bind = usb_child_post_bind,
.child_pre_probe = usb_child_pre_probe,
.per_child_platdata_auto_alloc_size = sizeof(struct usb_dev_platdata),
};