212 lines
6.4 KiB
C
212 lines
6.4 KiB
C
/*
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* Driver for USB OHCI Root Hubs ported from CoreBoot
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*
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* Copyright (C) 2014 BALATON Zoltan
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*
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* This file was part of the libpayload project.
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*
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* Copyright (C) 2010 Patrick Georgi
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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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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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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 "config.h"
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#include "timer.h"
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#include "usbohci_private.h"
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#include "usbohci.h"
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typedef struct {
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int numports;
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int *port;
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} rh_inst_t;
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#define RH_INST(dev) ((rh_inst_t*)(dev)->data)
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static void
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ohci_rh_enable_port (usbdev_t *dev, int port)
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{
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/* Reset RH port should hold 50ms with pulses of at least 10ms and
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* gaps of at most 3ms (usb20 spec 7.1.7.5).
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* After reset, the port will be enabled automatically (ohci spec
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* 7.4.4).
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*/
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int total_delay = 100; /* 100 * 500us == 50ms */
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while (total_delay > 0) {
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if (!(READ_OPREG(OHCI_INST(dev->controller), HcRhPortStatus[port])
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& CurrentConnectStatus))
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return;
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/* start reset */
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OHCI_INST (dev->controller)->opreg->HcRhPortStatus[port] =
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__cpu_to_le32(SetPortReset);
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int timeout = 200; /* timeout after 200 * 500us == 100ms */
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while ((READ_OPREG(OHCI_INST(dev->controller), HcRhPortStatus[port])
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& PortResetStatus)
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&& timeout--) {
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udelay(500); total_delay--;
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}
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if (READ_OPREG(OHCI_INST(dev->controller), HcRhPortStatus[port])
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& PortResetStatus) {
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usb_debug("Warning: root-hub port reset timed out.\n");
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break;
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}
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if ((200-timeout) < 20) {
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usb_debug("Warning: port reset too short: %dms; "
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"should be at least 10ms.\n",
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(200-timeout)/2);
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total_delay = 0; /* can happen on QEMU */
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}
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/* clear reset status change */
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OHCI_INST(dev->controller)->opreg->HcRhPortStatus[port] =
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__cpu_to_le32(PortResetStatusChange);
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usb_debug ("rh port reset finished after %dms.\n", (200-timeout)/2);
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}
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}
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/* disable root hub */
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static void
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ohci_rh_disable_port (usbdev_t *dev, int port)
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{
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OHCI_INST (dev->controller)->opreg->HcRhPortStatus[port] =
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__cpu_to_le32(ClearPortEnable); // disable port
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int timeout = 50; /* timeout after 50 * 100us == 5ms */
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while ((READ_OPREG(OHCI_INST (dev->controller), HcRhPortStatus[port])
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& PortEnableStatus)
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&& timeout--) {
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udelay(100);
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}
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}
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static void
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ohci_rh_scanport (usbdev_t *dev, int port)
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{
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if (port >= RH_INST(dev)->numports) {
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usb_debug("Invalid port %d\n", port);
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return;
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}
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/* device registered, and device change logged, so something must have happened */
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if (RH_INST (dev)->port[port] != -1) {
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usb_detach_device(dev->controller, RH_INST (dev)->port[port]);
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RH_INST (dev)->port[port] = -1;
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}
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/* no device attached
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previously registered devices are detached, nothing left to do */
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if (!(READ_OPREG(OHCI_INST(dev->controller), HcRhPortStatus[port]) & CurrentConnectStatus))
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return;
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// clear port state change
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OHCI_INST(dev->controller)->opreg->HcRhPortStatus[port] = __cpu_to_le32(ConnectStatusChange);
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ohci_rh_enable_port (dev, port);
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mdelay(100); // wait for signal to stabilize
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if (!(READ_OPREG(OHCI_INST(dev->controller), HcRhPortStatus[port]) & PortEnableStatus)) {
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usb_debug ("port enable failed\n");
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return;
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}
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int speed = (READ_OPREG(OHCI_INST(dev->controller), HcRhPortStatus[port]) & LowSpeedDeviceAttached) != 0;
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RH_INST (dev)->port[port] = usb_attach_device(dev->controller, dev->address, port, speed);
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}
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static int
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ohci_rh_report_port_changes (usbdev_t *dev)
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{
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ohci_t *const ohcic = OHCI_INST (dev->controller);
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int i;
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for (i = 0; i < RH_INST(dev)->numports; i++) {
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// maybe detach+attach happened between two scans?
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if (READ_OPREG(ohcic, HcRhPortStatus[i]) & ConnectStatusChange) {
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ohcic->opreg->HcRhPortStatus[i] = __cpu_to_le32(ConnectStatusChange);
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usb_debug("attachment change on port %d\n", i);
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return i;
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}
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}
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// no change
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return -1;
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}
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static void
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ohci_rh_destroy (usbdev_t *dev)
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{
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int i;
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for (i = 0; i < RH_INST (dev)->numports; i++)
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ohci_rh_disable_port (dev, i);
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free (RH_INST (dev));
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}
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static void
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ohci_rh_poll (usbdev_t *dev)
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{
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ohci_t *const ohcic = OHCI_INST (dev->controller);
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int port;
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/* Check if anything changed. */
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if (!(READ_OPREG(ohcic, HcInterruptStatus) & RootHubStatusChange))
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return;
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ohcic->opreg->HcInterruptStatus = __cpu_to_le32(RootHubStatusChange);
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usb_debug("root hub status change\n");
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/* Scan ports with changed connection status. */
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while ((port = ohci_rh_report_port_changes (dev)) != -1)
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ohci_rh_scanport (dev, port);
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}
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void
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ohci_rh_init (usbdev_t *dev)
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{
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int i;
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dev->destroy = ohci_rh_destroy;
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dev->poll = ohci_rh_poll;
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dev->data = malloc (sizeof (rh_inst_t));
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if (!dev->data) {
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printk("Not enough memory for OHCI RH.\n");
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return;
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}
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RH_INST (dev)->numports = READ_OPREG(OHCI_INST(dev->controller), HcRhDescriptorA) & NumberDownstreamPortsMask;
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RH_INST (dev)->port = malloc(sizeof(int) * RH_INST (dev)->numports);
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usb_debug("%d ports registered\n", RH_INST (dev)->numports);
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for (i = 0; i < RH_INST (dev)->numports; i++) {
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ohci_rh_enable_port (dev, i);
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RH_INST (dev)->port[i] = -1;
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}
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/* we can set them here because a root hub _really_ shouldn't
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appear elsewhere */
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dev->address = 0;
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dev->hub = -1;
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dev->port = -1;
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usb_debug("rh init done\n");
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}
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