Add common support functions for USB devices configured via FDT data.
FDT data is sometimes used to configure usb devices which are hardwired into an embedded system. Because the devices are instantiated by the usb enumeration process rather than by ofwbus iterating through the fdt data, it is somewhat difficult for a usb driver to locate fdt data that belongs to it. In the past, various ad-hoc methods have been used, which can lead to errors such applying configuration that should apply only to a hardwired device onto a similar device attached by the user at runtime. For example, if the user adds an ethernet device that uses the same driver as the builtin ethernet, both devices might end up with the same MAC address. These changes add a new usb_fdt_get_node() helper function that a driver can use to locate FDT data that belongs to a single unique instance of the device. This function locates the proper FDT data using the mechanism detailed in the standard "usb-device.txt" binding document [1]. There is also a new usb_fdt_get_mac_addr() function, used to retrieve the mac address for a given device instance from the fdt data. It uses usb_fdt_get_node() to locate the right node in the FDT data, and attempts to obtain the mac-address or local-mac-address property (in that order, the same as linux does it). The existing if_smsc driver is modified to use the new functions, both as an example and for testing the new functions. Rpi and rpi2 boards use this driver and provide the mac address via the fdt data. [1] https://github.com/torvalds/linux/blob/master/Documentation/devicetree/bindings/usb/usb-device.txt Differential Revision: https://reviews.freebsd.org/D20262
This commit is contained in:
Ian Lepore
parent
03f1cf9f32
commit
bac5ec96f4
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=347974
@ -3215,6 +3215,7 @@ dev/usb/usb_dev.c optional usb
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dev/usb/usb_device.c optional usb
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dev/usb/usb_dynamic.c optional usb
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dev/usb/usb_error.c optional usb
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dev/usb/usb_fdt_support.c optional usb fdt
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dev/usb/usb_generic.c optional usb
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dev/usb/usb_handle_request.c optional usb
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dev/usb/usb_hid.c optional usb
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@ -97,6 +97,7 @@ __FBSDID("$FreeBSD$");
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <dev/usb/usb_fdt_support.h>
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#endif
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#include <dev/usb/usb.h>
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@ -1559,147 +1560,6 @@ smsc_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
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return (rc);
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}
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#ifdef FDT
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/*
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* This is FreeBSD-specific compatibility strings for RPi/RPi2
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*/
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static phandle_t
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smsc_fdt_find_eth_node(phandle_t start)
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{
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phandle_t child, node;
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/* Traverse through entire tree to find usb ethernet nodes. */
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for (node = OF_child(start); node != 0; node = OF_peer(node)) {
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if ((ofw_bus_node_is_compatible(node, "net,ethernet") &&
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ofw_bus_node_is_compatible(node, "usb,device")) ||
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ofw_bus_node_is_compatible(node, "usb424,ec00"))
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return (node);
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child = smsc_fdt_find_eth_node(node);
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if (child != -1)
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return (child);
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}
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return (-1);
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}
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/*
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* Check if node's path is <*>/usb/hub/ethernet
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*/
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static int
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smsc_fdt_is_usb_eth(phandle_t node)
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{
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char name[16];
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int len;
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memset(name, 0, sizeof(name));
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len = OF_getprop(node, "name", name, sizeof(name));
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if (len <= 0)
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return (0);
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if (strcmp(name, "ethernet"))
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return (0);
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node = OF_parent(node);
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if (node == -1)
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return (0);
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len = OF_getprop(node, "name", name, sizeof(name));
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if (len <= 0)
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return (0);
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if (strcmp(name, "hub"))
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return (0);
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node = OF_parent(node);
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if (node == -1)
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return (0);
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len = OF_getprop(node, "name", name, sizeof(name));
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if (len <= 0)
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return (0);
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if (strcmp(name, "usb"))
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return (0);
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return (1);
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}
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static phandle_t
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smsc_fdt_find_eth_node_by_path(phandle_t start)
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{
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phandle_t child, node;
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/* Traverse through entire tree to find usb ethernet nodes. */
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for (node = OF_child(start); node != 0; node = OF_peer(node)) {
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if (smsc_fdt_is_usb_eth(node))
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return (node);
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child = smsc_fdt_find_eth_node_by_path(node);
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if (child != -1)
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return (child);
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}
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return (-1);
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}
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/*
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* Look through known names that can contain mac address
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* return 0 if valid MAC address has been found
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*/
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static int
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smsc_fdt_read_mac_property(phandle_t node, unsigned char *mac)
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{
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int len;
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/* Check if there is property */
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if ((len = OF_getproplen(node, "local-mac-address")) > 0) {
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if (len != ETHER_ADDR_LEN)
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return (EINVAL);
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OF_getprop(node, "local-mac-address", mac,
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ETHER_ADDR_LEN);
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return (0);
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}
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if ((len = OF_getproplen(node, "mac-address")) > 0) {
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if (len != ETHER_ADDR_LEN)
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return (EINVAL);
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OF_getprop(node, "mac-address", mac,
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ETHER_ADDR_LEN);
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return (0);
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}
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return (ENXIO);
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}
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/**
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* Get MAC address from FDT blob. Firmware or loader should fill
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* mac-address or local-mac-address property. Returns 0 if MAC address
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* obtained, error code otherwise.
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*/
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static int
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smsc_fdt_find_mac(unsigned char *mac)
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{
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phandle_t node, root;
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root = OF_finddevice("/");
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node = smsc_fdt_find_eth_node(root);
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if (node != -1) {
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if (smsc_fdt_read_mac_property(node, mac) == 0)
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return (0);
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}
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/*
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* If it's not FreeBSD FDT blob for RPi, try more
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* generic .../usb/hub/ethernet
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*/
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node = smsc_fdt_find_eth_node_by_path(root);
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if (node != -1)
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return smsc_fdt_read_mac_property(node, mac);
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return (ENXIO);
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}
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#endif
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/**
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* smsc_attach_post - Called after the driver attached to the USB interface
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* @ue: the USB ethernet device
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@ -1748,7 +1608,7 @@ smsc_attach_post(struct usb_ether *ue)
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err = smsc_eeprom_read(sc, 0x01, sc->sc_ue.ue_eaddr, ETHER_ADDR_LEN);
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#ifdef FDT
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if ((err != 0) || (!ETHER_IS_VALID(sc->sc_ue.ue_eaddr)))
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err = smsc_fdt_find_mac(sc->sc_ue.ue_eaddr);
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err = usb_fdt_get_mac_addr(sc->sc_ue.ue_dev, &sc->sc_ue);
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#endif
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if ((err != 0) || (!ETHER_IS_VALID(sc->sc_ue.ue_eaddr))) {
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read_random(sc->sc_ue.ue_eaddr, ETHER_ADDR_LEN);
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168
sys/dev/usb/usb_fdt_support.c
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168
sys/dev/usb/usb_fdt_support.c
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@ -0,0 +1,168 @@
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/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2019 Ian Lepore <ian@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/condvar.h>
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <dev/ofw/openfirm.h>
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#include <dev/usb/usb.h>
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#include <dev/usb/usbdi.h>
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#include <dev/usb/usb_process.h>
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#include <dev/usb/usb_busdma.h>
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#include <dev/usb/usb_controller.h>
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#include <dev/usb/usb_bus.h>
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#include <dev/usb/usb_device.h>
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#include <dev/usb/usb_freebsd.h>
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#include <dev/usb/usb_fdt_support.h>
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#include <dev/usb/net/usb_ethernet.h>
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/*
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* Define a constant for allocating an array pointers to serve as a stack of
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* devices between the controller and any arbitrary device on the bus. The
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* stack ends with the device itself, so add 1 to the max hub nesting depth.
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*/
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#define MAX_UDEV_NEST (MAX(USB_HUB_MAX_DEPTH, USB_SS_HUB_DEPTH_MAX) + 1)
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static phandle_t
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find_udev_in_children(phandle_t parent, struct usb_device *udev)
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{
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phandle_t child;
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ssize_t proplen;
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uint32_t port;
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char compat[16]; /* big enough for "usb1234,abcd" */
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/*
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* USB device nodes in FDT have a compatible string of "usb" followed by
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* the vendorId,productId rendered in hex. The port number is encoded
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* in the standard 'reg' property; it is one-based in the FDT data, but
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* usb_device.port_index is zero-based. To uniquely identify a device,
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* both the compatible string and the port number must match.
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*/
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snprintf(compat, sizeof(compat), "usb%x,%x",
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UGETW(udev->ddesc.idVendor), UGETW(udev->ddesc.idProduct));
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for (child = OF_child(parent); child != 0; child = OF_peer(child)) {
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if (!ofw_bus_node_is_compatible(child, compat))
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continue;
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proplen = OF_getencprop(child, "reg", &port, sizeof(port));
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if (proplen != sizeof(port))
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continue;
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if (port == (udev->port_index + 1))
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return (child);
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}
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return (-1);
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}
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static bool
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is_valid_mac_addr(uint8_t *addr)
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{
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/*
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* All-bits-zero and all-bits-one are a couple common cases of what
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* might get read from unprogrammed eeprom or OTP data, weed them out.
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*/
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if ((addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]) == 0x00)
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return (false);
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if ((addr[0] & addr[1] & addr[2] & addr[3] & addr[4] & addr[5]) == 0xff)
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return (false);
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return (true);
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}
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int
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usb_fdt_get_mac_addr(device_t dev, struct usb_ether* ue)
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{
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phandle_t node;
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ssize_t i, proplen;
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uint8_t mac[sizeof(ue->ue_eaddr)];
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static const char *properties[] = {
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"mac-address",
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"local-mac-address"
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};
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if ((node = usb_fdt_get_node(ue->ue_dev, ue->ue_udev)) == -1)
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return (ENXIO);
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for (i = 0; i < nitems(properties); ++i) {
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proplen = OF_getprop(node, properties[i], mac, sizeof(mac));
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if (proplen == sizeof(mac) && is_valid_mac_addr(mac)) {
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memcpy(ue->ue_eaddr, mac, sizeof(ue->ue_eaddr));
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return (0);
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}
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}
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return (ENXIO);
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}
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phandle_t
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usb_fdt_get_node(device_t dev, struct usb_device *udev)
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{
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struct usb_device *ud;
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struct usb_device *udev_stack[MAX_UDEV_NEST];
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phandle_t controller_node, node;
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int idx;
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/*
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* Start searching at the controller node. The usb_device links to the
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* bus, and its parent is the controller. If we can't get the
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* controller node, the requesting device cannot be in the fdt data.
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*/
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if ((controller_node = ofw_bus_get_node(udev->bus->parent)) == -1)
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return (-1);
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/*
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* Walk up the usb hub ancestor hierarchy, building a stack of devices
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* that begins with the requesting device and includes all the hubs
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* between it and the controller, NOT including the root hub (the FDT
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* bindings treat the controller and root hub as the same thing).
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*/
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for (ud = udev, idx = 0; ud->parent_hub != NULL; ud = ud->parent_hub) {
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KASSERT(idx < nitems(udev_stack), ("Too many hubs"));
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udev_stack[idx++] = ud;
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}
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/*
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* Now walk down the stack of udevs from the controller to the
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* requesting device, and also down the hierarchy of nested children of
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* the controller node in the fdt data. At each nesting level of fdt
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* data look for a child node whose properties match the vID,pID,portIdx
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* tuple for the udev at the corresponding layer of the udev stack. As
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* long as we keep matching up child nodes with udevs, loop and search
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* within the children of the just-found child for the next-deepest hub.
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* If at any level we fail to find a matching node, stop searching and
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* return. When we hit the end of the stack (the requesting device) we
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* return whatever the result was for the search at that nesting level.
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*/
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for (node = controller_node;;) {
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node = find_udev_in_children(node, udev_stack[--idx]);
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if (idx == 0 || node == -1)
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break;
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}
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return (node);
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}
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48
sys/dev/usb/usb_fdt_support.h
Normal file
48
sys/dev/usb/usb_fdt_support.h
Normal file
@ -0,0 +1,48 @@
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/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2019 Ian Lepore <ian@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
|
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* are met:
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* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _USB_FDT_SUPPORT_H_
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#define _USB_FDT_SUPPORT_H_
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struct usb_device;
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struct usb_ether;
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/*
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* Get the device's MAC address from the FDT data. Fills in ue->ue_eaddr and
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* returns 0 on success, otherwise leaves ue_eaddr untouched and returns
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* non-zero. This first attempts to get the address from the "mac-address"
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* property, and if that's not valid it tries the "local-mac-address" property;
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* this matches the linux interpretation of the precedence of those properties.
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*/
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int usb_fdt_get_mac_addr(device_t dev, struct usb_ether* ue);
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/* Get the FDT node for dev. Returns -1 if dev is not in the FDT data. */
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phandle_t usb_fdt_get_node(device_t dev, struct usb_device* udev);
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#endif
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@ -39,4 +39,8 @@ SRCS= bus_if.h device_if.h usb_if.h usb_if.c vnode_if.h \
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usb_msctest.c usb_parse.c usb_pf.c usb_process.c usb_request.c \
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usb_transfer.c usb_util.c
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.if !empty(OPT_FDT)
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SRCS+= usb_fdt_support.c ofw_bus_if.h
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.endif
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.include <bsd.kmod.mk>
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