usb-uclass.c

/*
 * (C) Copyright 2015 Google, Inc
 * Written by Simon Glass <sjg@chromium.org>
 *
 * usb_match_device() modified from Linux kernel v4.0.
 *
 * 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;
	}

#ifdef CONFIG_SANDBOX
	struct udevice *dev;

	/* Reset all enulation devices */
	ret = uclass_get(UCLASS_USB_EMUL, &uc);
	if (ret)
		return ret;

	uclass_foreach_dev(dev, uc)
		usb_emul_reset(dev);
#endif
	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 */
		printf("USB%d:   ", count);
		count++;
		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_setup_ehci_gadget(struct ehci_ctrl **ctlrp)
{
	struct usb_platdata *plat;
	struct udevice *dev;
	int ret;

	/* Find the old device and remove it */
	ret = uclass_find_device_by_seq(UCLASS_USB, 0, true, &dev);
	if (ret)
		return ret;
	ret = device_remove(dev);
	if (ret)
		return ret;

	plat = dev_get_platdata(dev);
	plat->init_type = USB_INIT_DEVICE;
	ret = device_probe(dev);
	if (ret)
		return ret;
	*ctlrp = dev_get_priv(dev);

	return 0;
}

/* returns 0 if no match, 1 if match */
int usb_match_device(const struct usb_device_descriptor *desc,
		     const struct usb_device_id *id)
{
	if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
	    id->idVendor != le16_to_cpu(desc->idVendor))
		return 0;

	if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) &&
	    id->idProduct != le16_to_cpu(desc->idProduct))
		return 0;

	/* No need to test id->bcdDevice_lo != 0, since 0 is never
	   greater than any unsigned number. */
	if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) &&
	    (id->bcdDevice_lo > le16_to_cpu(desc->bcdDevice)))
		return 0;

	if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) &&
	    (id->bcdDevice_hi < le16_to_cpu(desc->bcdDevice)))
		return 0;

	if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) &&
	    (id->bDeviceClass != desc->bDeviceClass))
		return 0;

	if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) &&
	    (id->bDeviceSubClass != desc->bDeviceSubClass))
		return 0;

	if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) &&
	    (id->bDeviceProtocol != desc->bDeviceProtocol))
		return 0;

	return 1;
}

/* returns 0 if no match, 1 if match */
int usb_match_one_id_intf(const struct usb_device_descriptor *desc,
			  const struct usb_interface_descriptor *int_desc,
			  const struct usb_device_id *id)
{
	/* The interface class, subclass, protocol and number should never be
	 * checked for a match if the device class is Vendor Specific,
	 * unless the match record specifies the Vendor ID. */
	if (desc->bDeviceClass == USB_CLASS_VENDOR_SPEC &&
	    !(id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
	    (id->match_flags & (USB_DEVICE_ID_MATCH_INT_CLASS |
				USB_DEVICE_ID_MATCH_INT_SUBCLASS |
				USB_DEVICE_ID_MATCH_INT_PROTOCOL |
				USB_DEVICE_ID_MATCH_INT_NUMBER)))
		return 0;

	if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) &&
	    (id->bInterfaceClass != int_desc->bInterfaceClass))
		return 0;

	if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) &&
	    (id->bInterfaceSubClass != int_desc->bInterfaceSubClass))
		return 0;

	if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) &&
	    (id->bInterfaceProtocol != int_desc->bInterfaceProtocol))
		return 0;

	if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_NUMBER) &&
	    (id->bInterfaceNumber != int_desc->bInterfaceNumber))
		return 0;

	return 1;
}

/* returns 0 if no match, 1 if match */
int usb_match_one_id(struct usb_device_descriptor *desc,
		     struct usb_interface_descriptor *int_desc,
		     const struct usb_device_id *id)
{
	if (!usb_match_device(desc, id))
		return 0;

	return usb_match_one_id_intf(desc, int_desc, id);
}

/**
 * usb_find_and_bind_driver() - Find and bind the right USB driver
 *
 * This only looks at certain fields in the descriptor.
 */
static int usb_find_and_bind_driver(struct udevice *parent,
				    struct usb_device_descriptor *desc,
				    struct usb_interface_descriptor *iface,
				    int bus_seq, int devnum,
				    struct udevice **devp)
{
	struct usb_driver_entry *start, *entry;
	int n_ents;
	int ret;
	char name[30], *str;

	*devp = NULL;
	debug("%s: Searching for driver\n", __func__);
	start = ll_entry_start(struct usb_driver_entry, usb_driver_entry);
	n_ents = ll_entry_count(struct usb_driver_entry, usb_driver_entry);
	for (entry = start; entry != start + n_ents; entry++) {
		const struct usb_device_id *id;
		struct udevice *dev;
		const struct driver *drv;
		struct usb_dev_platdata *plat;

		for (id = entry->match; id->match_flags; id++) {
			if (!usb_match_one_id(desc, iface, id))
				continue;

			drv = entry->driver;
			/*
			 * We could pass the descriptor to the driver as
			 * platdata (instead of NULL) and allow its bind()
			 * method to return -ENOENT if it doesn't support this
			 * device. That way we could continue the search to
			 * find another driver. For now this doesn't seem
			 * necesssary, so just bind the first match.
			 */
			ret = device_bind(parent, drv, drv->name, NULL, -1,
					  &dev);
			if (ret)
				goto error;
			debug("%s: Match found: %s\n", __func__, drv->name);
			dev->driver_data = id->driver_info;
			plat = dev_get_parent_platdata(dev);
			plat->id = *id;
			*devp = dev;
			return 0;
		}
	}

	/* Bind a generic driver so that the device can be used */
	snprintf(name, sizeof(name), "generic_bus_%x_dev_%x", bus_seq, devnum);
	str = strdup(name);
	if (!str)
		return -ENOMEM;
	ret = device_bind_driver(parent, "usb_dev_generic_drv", str, devp);

error:
	debug("%s: No match found: %d\n", __func__, ret);
	return ret;
}

/**
 * usb_find_child() - Find an existing device which matches our needs
 *
 *
 */
static int usb_find_child(struct udevice *parent,
			  struct usb_device_descriptor *desc,
			  struct usb_interface_descriptor *iface,
			  struct udevice **devp)
{
	struct udevice *dev;

	*devp = NULL;
	for (device_find_first_child(parent, &dev);
	     dev;
	     device_find_next_child(&dev)) {
		struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);

		/* If this device is already in use, skip it */
		if (device_active(dev))
			continue;
		debug("   %s: name='%s', plat=%d, desc=%d\n", __func__,
		      dev->name, plat->id.bDeviceClass, desc->bDeviceClass);
		if (usb_match_one_id(desc, iface, &plat->id)) {
			*devp = dev;
			return 0;
		}
	}

	return -ENOENT;
}

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));
	udev->controller_dev = usb_get_bus(parent);
	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);
	if (ret) {
		if (ret != -ENOENT)
			return ret;
		ret = usb_find_and_bind_driver(parent, &udev->descriptor, iface,
					       udev->controller_dev->seq,
					       udev->devnum, &dev);
		if (ret)
			return ret;
		created = true;
	}
	plat = dev_get_parent_platdata(dev);
	debug("%s: Probing '%s', plat=%p\n", __func__, dev->name, plat);
	plat->devnum = udev->devnum;
	plat->udev = udev;
	priv->next_addr++;
	ret = device_probe(dev);
	if (ret) {
		debug("%s: Device '%s' probe failed\n", __func__, dev->name);
		priv->next_addr--;
		if (created)
			device_unbind(dev);
		return ret;
	}
	*devp = dev;

	return 0;
}

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;
}

struct udevice *usb_get_bus(struct udevice *dev)
{
	struct udevice *bus;

	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 bus;
}

int usb_child_pre_probe(struct udevice *dev)
{
	struct usb_device *udev = dev_get_parentdata(dev);
	struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
	int ret;

	if (plat->udev) {
		/*
		 * Copy over all the values set in the on stack struct
		 * usb_device in usb_scan_device() to our final struct
		 * usb_device for this dev.
		 */
		*udev = *(plat->udev);
		/* And clear plat->udev as it will not be valid for long */
		plat->udev = NULL;
		udev->dev = dev;
	} else {
		/*
		 * This happens with devices which are explicitly bound
		 * instead of being discovered through usb_scan_device()
		 * such as sandbox emul devices.
		 */
		udev->dev = dev;
		udev->controller_dev = usb_get_bus(dev);
		udev->devnum = plat->devnum;

		/*
		 * udev did not go through usb_scan_device(), so we need to
		 * select the config and read the config descriptors.
		 */
		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),
};

UCLASS_DRIVER(usb_dev_generic) = {
	.id		= UCLASS_USB_DEV_GENERIC,
	.name		= "usb_dev_generic",
};

U_BOOT_DRIVER(usb_dev_generic_drv) = {
	.id		= UCLASS_USB_DEV_GENERIC,
	.name		= "usb_dev_generic_drv",
};