/* * * Copyright (C) 2010 Patrick Georgi * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 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. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * 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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ //#define USB_DEBUG #include #include "ohci_private.h" #include "ohci.h" typedef struct { int numports; int *port; } rh_inst_t; #define RH_INST(dev) ((rh_inst_t*)(dev)->data) static void ohci_rh_enable_port(usbdev_t *dev, int port) { /* Reset RH port should hold 50ms with pulses of at least 10ms and * gaps of at most 3ms (usb20 spec 7.1.7.5). * After reset, the port will be enabled automatically (ohci spec * 7.4.4). */ int total_delay = 100; /* 100 * 500us == 50ms */ while (total_delay > 0) { if (!(OHCI_INST(dev->controller)->opreg->HcRhPortStatus[port] & CurrentConnectStatus)) return; /* start reset */ OHCI_INST(dev->controller)->opreg->HcRhPortStatus[port] = SetPortReset; int timeout = 200; /* timeout after 200 * 500us == 100ms */ while ((OHCI_INST(dev->controller)->opreg->HcRhPortStatus[port] & PortResetStatus) && timeout--) { udelay(500); total_delay--; } if (OHCI_INST(dev->controller)->opreg->HcRhPortStatus[port] & PortResetStatus) { usb_debug("Warning: root-hub port reset timed out.\n"); break; } if ((200-timeout) < 20) usb_debug("Warning: port reset too short: %dms; " "should be at least 10ms.\n", (200-timeout)/2); /* clear reset status change */ OHCI_INST(dev->controller)->opreg->HcRhPortStatus[port] = PortResetStatusChange; usb_debug("rh port reset finished after %dms.\n", (200-timeout)/2); } } /* disable root hub */ static void ohci_rh_disable_port(usbdev_t *dev, int port) { if (RH_INST(dev)->port[port] != -1) { usb_detach_device(dev->controller, RH_INST(dev)->port[port]); RH_INST(dev)->port[port] = -1; } OHCI_INST(dev->controller)->opreg->HcRhPortStatus[port] = ClearPortEnable; // disable port int timeout = 50; /* timeout after 50 * 100us == 5ms */ while ((OHCI_INST(dev->controller)->opreg->HcRhPortStatus[port] & PortEnableStatus) && timeout--) { udelay(100); } } static void ohci_rh_scanport(usbdev_t *dev, int port) { if (port >= RH_INST(dev)->numports) { usb_debug("Invalid port %d\n", port); return; } /* device registered, and device change logged, so something must have happened */ if (RH_INST(dev)->port[port] != -1) { usb_detach_device(dev->controller, RH_INST(dev)->port[port]); RH_INST(dev)->port[port] = -1; } /* no device attached previously registered devices are detached, nothing left to do */ if (!(OHCI_INST(dev->controller)->opreg->HcRhPortStatus[port] & CurrentConnectStatus)) return; OHCI_INST(dev->controller)->opreg->HcRhPortStatus[port] = ConnectStatusChange; // clear port state change ohci_rh_enable_port(dev, port); mdelay(100); // wait for signal to stabilize if (!(OHCI_INST(dev->controller)->opreg->HcRhPortStatus[port] & PortEnableStatus)) { usb_debug("port enable failed\n"); return; } usb_speed speed = (OHCI_INST(dev->controller)->opreg->HcRhPortStatus[port] & LowSpeedDeviceAttached) != 0; RH_INST(dev)->port[port] = usb_attach_device(dev->controller, dev->address, port, speed); } static int ohci_rh_report_port_changes(usbdev_t *dev) { ohci_t *const ohcic = OHCI_INST(dev->controller); int i; for (i = 0; i < RH_INST(dev)->numports; i++) { // maybe detach+attach happened between two scans? if (ohcic->opreg->HcRhPortStatus[i] & ConnectStatusChange) { ohcic->opreg->HcRhPortStatus[i] = ConnectStatusChange; usb_debug("attachment change on port %d\n", i); return i; } } // no change return -1; } static void ohci_rh_destroy(usbdev_t *dev) { int i; for (i = 0; i < RH_INST(dev)->numports; i++) ohci_rh_disable_port(dev, i); free(RH_INST(dev)); } static void ohci_rh_poll(usbdev_t *dev) { ohci_t *const ohcic = OHCI_INST(dev->controller); int port; /* Check if anything changed. */ if (!(ohcic->opreg->HcInterruptStatus & RootHubStatusChange)) return; ohcic->opreg->HcInterruptStatus = RootHubStatusChange; usb_debug("root hub status change\n"); /* Scan ports with changed connection status. */ while ((port = ohci_rh_report_port_changes(dev)) != -1) ohci_rh_scanport(dev, port); } void ohci_rh_init(usbdev_t *dev) { int i; dev->destroy = ohci_rh_destroy; dev->poll = ohci_rh_poll; dev->data = xmalloc(sizeof(rh_inst_t)); RH_INST(dev)->numports = OHCI_INST(dev->controller)->opreg->HcRhDescriptorA & NumberDownstreamPortsMask; RH_INST(dev)->port = xmalloc(sizeof(int) * RH_INST(dev)->numports); usb_debug("%d ports registered\n", RH_INST(dev)->numports); for (i = 0; i < RH_INST(dev)->numports; i++) { ohci_rh_enable_port(dev, i); RH_INST(dev)->port[i] = -1; } /* we can set them here because a root hub _really_ shouldn't appear elsewhere */ dev->address = 0; dev->hub = -1; dev->port = -1; usb_debug("rh init done\n"); }