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>master
Simon Glass
10 years ago
parent
56a71f891b
commit
de31213fb8
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/*
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* (C) Copyright 2015 Google, Inc |
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* Written by Simon Glass <sjg@chromium.org> |
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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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#include <common.h> |
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#include <dm.h> |
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#include <errno.h> |
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#include <usb.h> |
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#include <dm/device-internal.h> |
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#include <dm/lists.h> |
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#include <dm/root.h> |
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#include <dm/uclass-internal.h> |
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DECLARE_GLOBAL_DATA_PTR; |
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extern bool usb_started; /* flag for the started/stopped USB status */ |
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static bool asynch_allowed; |
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int usb_disable_asynch(int disable) |
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{ |
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int old_value = asynch_allowed; |
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asynch_allowed = !disable; |
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return old_value; |
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} |
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int submit_int_msg(struct usb_device *udev, unsigned long pipe, void *buffer, |
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int length, int interval) |
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{ |
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struct udevice *bus = udev->controller_dev; |
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struct dm_usb_ops *ops = usb_get_ops(bus); |
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if (!ops->interrupt) |
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return -ENOSYS; |
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return ops->interrupt(bus, udev, pipe, buffer, length, interval); |
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} |
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int submit_control_msg(struct usb_device *udev, unsigned long pipe, |
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void *buffer, int length, struct devrequest *setup) |
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{ |
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struct udevice *bus = udev->controller_dev; |
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struct dm_usb_ops *ops = usb_get_ops(bus); |
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if (!ops->control) |
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return -ENOSYS; |
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return ops->control(bus, udev, pipe, buffer, length, setup); |
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} |
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int submit_bulk_msg(struct usb_device *udev, unsigned long pipe, void *buffer, |
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int length) |
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{ |
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struct udevice *bus = udev->controller_dev; |
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struct dm_usb_ops *ops = usb_get_ops(bus); |
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if (!ops->bulk) |
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return -ENOSYS; |
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return ops->bulk(bus, udev, pipe, buffer, length); |
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} |
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int usb_alloc_device(struct usb_device *udev) |
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{ |
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struct udevice *bus = udev->controller_dev; |
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struct dm_usb_ops *ops = usb_get_ops(bus); |
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/* This is only requird by some controllers - current XHCI */ |
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if (!ops->alloc_device) |
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return 0; |
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return ops->alloc_device(bus, udev); |
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} |
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int usb_stop(void) |
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{ |
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struct udevice *bus; |
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struct uclass *uc; |
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int err = 0, ret; |
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/* De-activate any devices that have been activated */ |
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ret = uclass_get(UCLASS_USB, &uc); |
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if (ret) |
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return ret; |
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uclass_foreach_dev(bus, uc) { |
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ret = device_remove(bus); |
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if (ret && !err) |
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err = ret; |
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} |
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usb_stor_reset(); |
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usb_hub_reset(); |
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usb_started = 0; |
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return err; |
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} |
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static int usb_scan_bus(struct udevice *bus, bool recurse) |
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{ |
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struct usb_bus_priv *priv; |
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struct udevice *dev; |
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int ret; |
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priv = dev_get_uclass_priv(bus); |
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assert(recurse); /* TODO: Support non-recusive */ |
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ret = usb_scan_device(bus, 0, USB_SPEED_FULL, &dev); |
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if (ret) |
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return ret; |
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return priv->next_addr; |
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} |
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int usb_init(void) |
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{ |
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int controllers_initialized = 0; |
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struct udevice *bus; |
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struct uclass *uc; |
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int count = 0; |
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int ret; |
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asynch_allowed = 1; |
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usb_hub_reset(); |
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ret = uclass_get(UCLASS_USB, &uc); |
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if (ret) |
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return ret; |
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uclass_foreach_dev(bus, uc) { |
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/* init low_level USB */ |
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count++; |
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printf("USB"); |
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printf("%d: ", bus->seq); |
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ret = device_probe(bus); |
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if (ret == -ENODEV) { /* No such device. */ |
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puts("Port not available.\n"); |
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controllers_initialized++; |
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continue; |
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} |
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if (ret) { /* Other error. */ |
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printf("probe failed, error %d\n", ret); |
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continue; |
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} |
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/*
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* lowlevel init is OK, now scan the bus for devices |
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* i.e. search HUBs and configure them |
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*/ |
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controllers_initialized++; |
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printf("scanning bus %d for devices... ", bus->seq); |
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debug("\n"); |
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ret = usb_scan_bus(bus, true); |
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if (ret < 0) |
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printf("failed, error %d\n", ret); |
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else if (!ret) |
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printf("No USB Device found\n"); |
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else |
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printf("%d USB Device(s) found\n", ret); |
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usb_started = true; |
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} |
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debug("scan end\n"); |
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/* if we were not able to find at least one working bus, bail out */ |
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if (!count) |
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printf("No controllers found\n"); |
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else if (controllers_initialized == 0) |
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printf("USB error: all controllers failed lowlevel init\n"); |
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return usb_started ? 0 : -1; |
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} |
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int usb_reset_root_port(void) |
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{ |
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return -ENOSYS; |
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} |
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static struct usb_device *find_child_devnum(struct udevice *parent, int devnum) |
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{ |
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struct usb_device *udev; |
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struct udevice *dev; |
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if (!device_active(parent)) |
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return NULL; |
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udev = dev_get_parentdata(parent); |
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if (udev->devnum == devnum) |
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return udev; |
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for (device_find_first_child(parent, &dev); |
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dev; |
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device_find_next_child(&dev)) { |
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udev = find_child_devnum(dev, devnum); |
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if (udev) |
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return udev; |
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} |
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return NULL; |
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} |
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struct usb_device *usb_get_dev_index(struct udevice *bus, int index) |
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{ |
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struct udevice *hub; |
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int devnum = index + 1; /* Addresses are allocated from 1 on USB */ |
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device_find_first_child(bus, &hub); |
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if (device_get_uclass_id(hub) == UCLASS_USB_HUB) |
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return find_child_devnum(hub, devnum); |
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return NULL; |
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} |
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int usb_post_bind(struct udevice *dev) |
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{ |
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/* Scan the bus for devices */ |
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return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false); |
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} |
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int usb_port_reset(struct usb_device *parent, int portnr) |
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{ |
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unsigned short portstatus; |
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int ret; |
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debug("%s: start\n", __func__); |
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if (parent) { |
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/* reset the port for the second time */ |
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assert(portnr > 0); |
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debug("%s: reset %d\n", __func__, portnr - 1); |
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ret = legacy_hub_port_reset(parent, portnr - 1, &portstatus); |
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if (ret < 0) { |
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printf("\n Couldn't reset port %i\n", portnr); |
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return ret; |
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} |
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} else { |
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debug("%s: reset root\n", __func__); |
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usb_reset_root_port(); |
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} |
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return 0; |
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} |
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int usb_legacy_port_reset(struct usb_device *parent, int portnr) |
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{ |
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return usb_port_reset(parent, portnr); |
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} |
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int usb_scan_device(struct udevice *parent, int port, |
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enum usb_device_speed speed, struct udevice **devp) |
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{ |
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struct udevice *dev; |
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bool created = false; |
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struct usb_dev_platdata *plat; |
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struct usb_bus_priv *priv; |
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struct usb_device *parent_udev; |
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int ret; |
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ALLOC_CACHE_ALIGN_BUFFER(struct usb_device, udev, 1); |
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struct usb_interface_descriptor *iface = &udev->config.if_desc[0].desc; |
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*devp = NULL; |
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memset(udev, '\0', sizeof(*udev)); |
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ret = usb_get_bus(parent, &udev->controller_dev); |
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if (ret) |
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return ret; |
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priv = dev_get_uclass_priv(udev->controller_dev); |
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/*
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* Somewhat nasty, this. We create a local device and use the normal |
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* USB stack to read its descriptor. Then we know what type of device |
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* to create for real. |
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* |
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* udev->dev is set to the parent, since we don't have a real device |
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* yet. The USB stack should not access udev.dev anyway, except perhaps |
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* to find the controller, and the controller will either be @parent, |
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* or some parent of @parent. |
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* |
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* Another option might be to create the device as a generic USB |
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* device, then morph it into the correct one when we know what it |
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* should be. This means that a generic USB device would morph into |
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* a network controller, or a USB flash stick, for example. However, |
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* we don't support such morphing and it isn't clear that it would |
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* be easy to do. |
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* |
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* Yet another option is to split out the USB stack parts of udev |
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* into something like a 'struct urb' (as Linux does) which can exist |
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* independently of any device. This feels cleaner, but calls for quite |
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* a big change to the USB stack. |
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* |
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* For now, the approach is to set up an empty udev, read its |
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* descriptor and assign it an address, then bind a real device and |
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* stash the resulting information into the device's parent |
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* platform data. Then when we probe it, usb_child_pre_probe() is called |
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* and it will pull the information out of the stash. |
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*/ |
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udev->dev = parent; |
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udev->speed = speed; |
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udev->devnum = priv->next_addr + 1; |
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udev->portnr = port; |
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debug("Calling usb_setup_device(), portnr=%d\n", udev->portnr); |
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parent_udev = device_get_uclass_id(parent) == UCLASS_USB_HUB ? |
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dev_get_parentdata(parent) : NULL; |
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ret = usb_setup_device(udev, priv->desc_before_addr, parent_udev, port); |
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debug("read_descriptor for '%s': ret=%d\n", parent->name, ret); |
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if (ret) |
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return ret; |
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ret = usb_find_child(parent, &udev->descriptor, iface, &dev); |
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debug("** usb_find_child returns %d\n", ret); |
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/* TODO: Find a suitable driver and create the device */ |
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return -ENOENT; |
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} |
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int usb_child_post_bind(struct udevice *dev) |
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{ |
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struct usb_dev_platdata *plat = dev_get_parent_platdata(dev); |
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const void *blob = gd->fdt_blob; |
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int val; |
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if (dev->of_offset == -1) |
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return 0; |
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/* We only support matching a few things */ |
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val = fdtdec_get_int(blob, dev->of_offset, "usb,device-class", -1); |
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if (val != -1) { |
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plat->id.match_flags |= USB_DEVICE_ID_MATCH_DEV_CLASS; |
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plat->id.bDeviceClass = val; |
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} |
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val = fdtdec_get_int(blob, dev->of_offset, "usb,interface-class", -1); |
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if (val != -1) { |
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plat->id.match_flags |= USB_DEVICE_ID_MATCH_INT_CLASS; |
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plat->id.bInterfaceClass = val; |
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} |
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return 0; |
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} |
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int usb_get_bus(struct udevice *dev, struct udevice **busp) |
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{ |
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struct udevice *bus; |
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*busp = NULL; |
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for (bus = dev; bus && device_get_uclass_id(bus) != UCLASS_USB; ) |
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bus = bus->parent; |
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if (!bus) { |
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/* By design this cannot happen */ |
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assert(bus); |
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debug("USB HUB '%s' does not have a controller\n", dev->name); |
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return -EXDEV; |
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} |
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*busp = bus; |
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return 0; |
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} |
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int usb_child_pre_probe(struct udevice *dev) |
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{ |
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struct udevice *bus; |
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struct usb_device *udev = dev_get_parentdata(dev); |
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struct usb_dev_platdata *plat = dev_get_parent_platdata(dev); |
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int ret; |
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ret = usb_get_bus(dev, &bus); |
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if (ret) |
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return ret; |
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udev->controller_dev = bus; |
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udev->dev = dev; |
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udev->devnum = plat->devnum; |
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udev->slot_id = plat->slot_id; |
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udev->portnr = plat->portnr; |
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udev->speed = plat->speed; |
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debug("** device '%s': getting slot_id=%d\n", dev->name, plat->slot_id); |
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ret = usb_select_config(udev); |
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if (ret) |
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return ret; |
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return 0; |
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} |
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UCLASS_DRIVER(usb) = { |
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.id = UCLASS_USB, |
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.name = "usb", |
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.flags = DM_UC_FLAG_SEQ_ALIAS, |
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.post_bind = usb_post_bind, |
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.per_child_auto_alloc_size = sizeof(struct usb_device), |
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.per_device_auto_alloc_size = sizeof(struct usb_bus_priv), |
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.child_post_bind = usb_child_post_bind, |
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.child_pre_probe = usb_child_pre_probe, |
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.per_child_platdata_auto_alloc_size = sizeof(struct usb_dev_platdata), |
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}; |
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